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1// SPDX-License-Identifier: GPL-1.0+
2/*
3 * Device driver for Microgate SyncLink GT serial adapters.
4 *
5 * written by Paul Fulghum for Microgate Corporation
6 * paulkf@microgate.com
7 *
8 * Microgate and SyncLink are trademarks of Microgate Corporation
9 *
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
12 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
13 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
14 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
15 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
16 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
17 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
18 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
19 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
20 * OF THE POSSIBILITY OF SUCH DAMAGE.
21 */
22
23/*
24 * DEBUG OUTPUT DEFINITIONS
25 *
26 * uncomment lines below to enable specific types of debug output
27 *
28 * DBGINFO information - most verbose output
29 * DBGERR serious errors
30 * DBGBH bottom half service routine debugging
31 * DBGISR interrupt service routine debugging
32 * DBGDATA output receive and transmit data
33 * DBGTBUF output transmit DMA buffers and registers
34 * DBGRBUF output receive DMA buffers and registers
35 */
36
37#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
38#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
39#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
40#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
41#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
42/*#define DBGTBUF(info) dump_tbufs(info)*/
43/*#define DBGRBUF(info) dump_rbufs(info)*/
44
45
46#include <linux/module.h>
47#include <linux/errno.h>
48#include <linux/signal.h>
49#include <linux/sched.h>
50#include <linux/timer.h>
51#include <linux/interrupt.h>
52#include <linux/pci.h>
53#include <linux/tty.h>
54#include <linux/tty_flip.h>
55#include <linux/serial.h>
56#include <linux/major.h>
57#include <linux/string.h>
58#include <linux/fcntl.h>
59#include <linux/ptrace.h>
60#include <linux/ioport.h>
61#include <linux/mm.h>
62#include <linux/seq_file.h>
63#include <linux/slab.h>
64#include <linux/netdevice.h>
65#include <linux/vmalloc.h>
66#include <linux/init.h>
67#include <linux/delay.h>
68#include <linux/ioctl.h>
69#include <linux/termios.h>
70#include <linux/bitops.h>
71#include <linux/workqueue.h>
72#include <linux/hdlc.h>
73#include <linux/synclink.h>
74
75#include <asm/io.h>
76#include <asm/irq.h>
77#include <asm/dma.h>
78#include <asm/types.h>
79#include <linux/uaccess.h>
80
81#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
82#define SYNCLINK_GENERIC_HDLC 1
83#else
84#define SYNCLINK_GENERIC_HDLC 0
85#endif
86
87/*
88 * module identification
89 */
90static const char driver_name[] = "SyncLink GT";
91static const char tty_dev_prefix[] = "ttySLG";
92MODULE_LICENSE("GPL");
93#define MAX_DEVICES 32
94
95static const struct pci_device_id pci_table[] = {
96 { PCI_VDEVICE(MICROGATE, SYNCLINK_GT_DEVICE_ID) },
97 { PCI_VDEVICE(MICROGATE, SYNCLINK_GT2_DEVICE_ID) },
98 { PCI_VDEVICE(MICROGATE, SYNCLINK_GT4_DEVICE_ID) },
99 { PCI_VDEVICE(MICROGATE, SYNCLINK_AC_DEVICE_ID) },
100 { 0 }, /* terminate list */
101};
102MODULE_DEVICE_TABLE(pci, pci_table);
103
104static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
105static void remove_one(struct pci_dev *dev);
106static struct pci_driver pci_driver = {
107 .name = "synclink_gt",
108 .id_table = pci_table,
109 .probe = init_one,
110 .remove = remove_one,
111};
112
113static bool pci_registered;
114
115/*
116 * module configuration and status
117 */
118static struct slgt_info *slgt_device_list;
119static int slgt_device_count;
120
121static int ttymajor;
122static int debug_level;
123static int maxframe[MAX_DEVICES];
124
125module_param(ttymajor, int, 0);
126module_param(debug_level, int, 0);
127module_param_array(maxframe, int, NULL, 0);
128
129MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
130MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
131MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
132
133/*
134 * tty support and callbacks
135 */
136static struct tty_driver *serial_driver;
137
138static void wait_until_sent(struct tty_struct *tty, int timeout);
139static void flush_buffer(struct tty_struct *tty);
140static void tx_release(struct tty_struct *tty);
141
142/*
143 * generic HDLC support
144 */
145#define dev_to_port(D) (dev_to_hdlc(D)->priv)
146
147
148/*
149 * device specific structures, macros and functions
150 */
151
152#define SLGT_MAX_PORTS 4
153#define SLGT_REG_SIZE 256
154
155/*
156 * conditional wait facility
157 */
158struct cond_wait {
159 struct cond_wait *next;
160 wait_queue_head_t q;
161 wait_queue_entry_t wait;
162 unsigned int data;
163};
164static void flush_cond_wait(struct cond_wait **head);
165
166/*
167 * DMA buffer descriptor and access macros
168 */
169struct slgt_desc
170{
171 __le16 count;
172 __le16 status;
173 __le32 pbuf; /* physical address of data buffer */
174 __le32 next; /* physical address of next descriptor */
175
176 /* driver book keeping */
177 char *buf; /* virtual address of data buffer */
178 unsigned int pdesc; /* physical address of this descriptor */
179 dma_addr_t buf_dma_addr;
180 unsigned short buf_count;
181};
182
183#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
184#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
185#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
186#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
187#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
188#define desc_count(a) (le16_to_cpu((a).count))
189#define desc_status(a) (le16_to_cpu((a).status))
190#define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
191#define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
192#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
193#define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
194#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
195
196struct _input_signal_events {
197 int ri_up;
198 int ri_down;
199 int dsr_up;
200 int dsr_down;
201 int dcd_up;
202 int dcd_down;
203 int cts_up;
204 int cts_down;
205};
206
207/*
208 * device instance data structure
209 */
210struct slgt_info {
211 void *if_ptr; /* General purpose pointer (used by SPPP) */
212 struct tty_port port;
213
214 struct slgt_info *next_device; /* device list link */
215
216 char device_name[25];
217 struct pci_dev *pdev;
218
219 int port_count; /* count of ports on adapter */
220 int adapter_num; /* adapter instance number */
221 int port_num; /* port instance number */
222
223 /* array of pointers to port contexts on this adapter */
224 struct slgt_info *port_array[SLGT_MAX_PORTS];
225
226 int line; /* tty line instance number */
227
228 struct mgsl_icount icount;
229
230 int timeout;
231 int x_char; /* xon/xoff character */
232 unsigned int read_status_mask;
233 unsigned int ignore_status_mask;
234
235 wait_queue_head_t status_event_wait_q;
236 wait_queue_head_t event_wait_q;
237 struct timer_list tx_timer;
238 struct timer_list rx_timer;
239
240 unsigned int gpio_present;
241 struct cond_wait *gpio_wait_q;
242
243 spinlock_t lock; /* spinlock for synchronizing with ISR */
244
245 struct work_struct task;
246 u32 pending_bh;
247 bool bh_requested;
248 bool bh_running;
249
250 int isr_overflow;
251 bool irq_requested; /* true if IRQ requested */
252 bool irq_occurred; /* for diagnostics use */
253
254 /* device configuration */
255
256 unsigned int bus_type;
257 unsigned int irq_level;
258 unsigned long irq_flags;
259
260 unsigned char __iomem * reg_addr; /* memory mapped registers address */
261 u32 phys_reg_addr;
262 bool reg_addr_requested;
263
264 MGSL_PARAMS params; /* communications parameters */
265 u32 idle_mode;
266 u32 max_frame_size; /* as set by device config */
267
268 unsigned int rbuf_fill_level;
269 unsigned int rx_pio;
270 unsigned int if_mode;
271 unsigned int base_clock;
272 unsigned int xsync;
273 unsigned int xctrl;
274
275 /* device status */
276
277 bool rx_enabled;
278 bool rx_restart;
279
280 bool tx_enabled;
281 bool tx_active;
282
283 unsigned char signals; /* serial signal states */
284 int init_error; /* initialization error */
285
286 unsigned char *tx_buf;
287 int tx_count;
288
289 bool drop_rts_on_tx_done;
290 struct _input_signal_events input_signal_events;
291
292 int dcd_chkcount; /* check counts to prevent */
293 int cts_chkcount; /* too many IRQs if a signal */
294 int dsr_chkcount; /* is floating */
295 int ri_chkcount;
296
297 char *bufs; /* virtual address of DMA buffer lists */
298 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
299
300 unsigned int rbuf_count;
301 struct slgt_desc *rbufs;
302 unsigned int rbuf_current;
303 unsigned int rbuf_index;
304 unsigned int rbuf_fill_index;
305 unsigned short rbuf_fill_count;
306
307 unsigned int tbuf_count;
308 struct slgt_desc *tbufs;
309 unsigned int tbuf_current;
310 unsigned int tbuf_start;
311
312 unsigned char *tmp_rbuf;
313 unsigned int tmp_rbuf_count;
314
315 /* SPPP/Cisco HDLC device parts */
316
317 int netcount;
318 spinlock_t netlock;
319#if SYNCLINK_GENERIC_HDLC
320 struct net_device *netdev;
321#endif
322
323};
324
325static const MGSL_PARAMS default_params = {
326 .mode = MGSL_MODE_HDLC,
327 .loopback = 0,
328 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
329 .encoding = HDLC_ENCODING_NRZI_SPACE,
330 .clock_speed = 0,
331 .addr_filter = 0xff,
332 .crc_type = HDLC_CRC_16_CCITT,
333 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
334 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
335 .data_rate = 9600,
336 .data_bits = 8,
337 .stop_bits = 1,
338 .parity = ASYNC_PARITY_NONE
339};
340
341
342#define BH_RECEIVE 1
343#define BH_TRANSMIT 2
344#define BH_STATUS 4
345#define IO_PIN_SHUTDOWN_LIMIT 100
346
347#define DMABUFSIZE 256
348#define DESC_LIST_SIZE 4096
349
350#define MASK_PARITY BIT1
351#define MASK_FRAMING BIT0
352#define MASK_BREAK BIT14
353#define MASK_OVERRUN BIT4
354
355#define GSR 0x00 /* global status */
356#define JCR 0x04 /* JTAG control */
357#define IODR 0x08 /* GPIO direction */
358#define IOER 0x0c /* GPIO interrupt enable */
359#define IOVR 0x10 /* GPIO value */
360#define IOSR 0x14 /* GPIO interrupt status */
361#define TDR 0x80 /* tx data */
362#define RDR 0x80 /* rx data */
363#define TCR 0x82 /* tx control */
364#define TIR 0x84 /* tx idle */
365#define TPR 0x85 /* tx preamble */
366#define RCR 0x86 /* rx control */
367#define VCR 0x88 /* V.24 control */
368#define CCR 0x89 /* clock control */
369#define BDR 0x8a /* baud divisor */
370#define SCR 0x8c /* serial control */
371#define SSR 0x8e /* serial status */
372#define RDCSR 0x90 /* rx DMA control/status */
373#define TDCSR 0x94 /* tx DMA control/status */
374#define RDDAR 0x98 /* rx DMA descriptor address */
375#define TDDAR 0x9c /* tx DMA descriptor address */
376#define XSR 0x40 /* extended sync pattern */
377#define XCR 0x44 /* extended control */
378
379#define RXIDLE BIT14
380#define RXBREAK BIT14
381#define IRQ_TXDATA BIT13
382#define IRQ_TXIDLE BIT12
383#define IRQ_TXUNDER BIT11 /* HDLC */
384#define IRQ_RXDATA BIT10
385#define IRQ_RXIDLE BIT9 /* HDLC */
386#define IRQ_RXBREAK BIT9 /* async */
387#define IRQ_RXOVER BIT8
388#define IRQ_DSR BIT7
389#define IRQ_CTS BIT6
390#define IRQ_DCD BIT5
391#define IRQ_RI BIT4
392#define IRQ_ALL 0x3ff0
393#define IRQ_MASTER BIT0
394
395#define slgt_irq_on(info, mask) \
396 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
397#define slgt_irq_off(info, mask) \
398 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
399
400static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
401static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
402static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
403static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
404static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
405static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
406
407static void msc_set_vcr(struct slgt_info *info);
408
409static int startup(struct slgt_info *info);
410static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
411static void shutdown(struct slgt_info *info);
412static void program_hw(struct slgt_info *info);
413static void change_params(struct slgt_info *info);
414
415static int adapter_test(struct slgt_info *info);
416
417static void reset_port(struct slgt_info *info);
418static void async_mode(struct slgt_info *info);
419static void sync_mode(struct slgt_info *info);
420
421static void rx_stop(struct slgt_info *info);
422static void rx_start(struct slgt_info *info);
423static void reset_rbufs(struct slgt_info *info);
424static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
425static bool rx_get_frame(struct slgt_info *info);
426static bool rx_get_buf(struct slgt_info *info);
427
428static void tx_start(struct slgt_info *info);
429static void tx_stop(struct slgt_info *info);
430static void tx_set_idle(struct slgt_info *info);
431static unsigned int tbuf_bytes(struct slgt_info *info);
432static void reset_tbufs(struct slgt_info *info);
433static void tdma_reset(struct slgt_info *info);
434static bool tx_load(struct slgt_info *info, const u8 *buf, unsigned int count);
435
436static void get_gtsignals(struct slgt_info *info);
437static void set_gtsignals(struct slgt_info *info);
438static void set_rate(struct slgt_info *info, u32 data_rate);
439
440static void bh_transmit(struct slgt_info *info);
441static void isr_txeom(struct slgt_info *info, unsigned short status);
442
443static void tx_timeout(struct timer_list *t);
444static void rx_timeout(struct timer_list *t);
445
446/*
447 * ioctl handlers
448 */
449static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
450static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
451static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
452static int get_txidle(struct slgt_info *info, int __user *idle_mode);
453static int set_txidle(struct slgt_info *info, int idle_mode);
454static int tx_enable(struct slgt_info *info, int enable);
455static int tx_abort(struct slgt_info *info);
456static int rx_enable(struct slgt_info *info, int enable);
457static int modem_input_wait(struct slgt_info *info,int arg);
458static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
459static int get_interface(struct slgt_info *info, int __user *if_mode);
460static int set_interface(struct slgt_info *info, int if_mode);
461static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
462static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
463static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
464static int get_xsync(struct slgt_info *info, int __user *if_mode);
465static int set_xsync(struct slgt_info *info, int if_mode);
466static int get_xctrl(struct slgt_info *info, int __user *if_mode);
467static int set_xctrl(struct slgt_info *info, int if_mode);
468
469/*
470 * driver functions
471 */
472static void release_resources(struct slgt_info *info);
473
474/*
475 * DEBUG OUTPUT CODE
476 */
477#ifndef DBGINFO
478#define DBGINFO(fmt)
479#endif
480#ifndef DBGERR
481#define DBGERR(fmt)
482#endif
483#ifndef DBGBH
484#define DBGBH(fmt)
485#endif
486#ifndef DBGISR
487#define DBGISR(fmt)
488#endif
489
490#ifdef DBGDATA
491static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
492{
493 int i;
494 int linecount;
495 printk("%s %s data:\n",info->device_name, label);
496 while(count) {
497 linecount = (count > 16) ? 16 : count;
498 for(i=0; i < linecount; i++)
499 printk("%02X ",(unsigned char)data[i]);
500 for(;i<17;i++)
501 printk(" ");
502 for(i=0;i<linecount;i++) {
503 if (data[i]>=040 && data[i]<=0176)
504 printk("%c",data[i]);
505 else
506 printk(".");
507 }
508 printk("\n");
509 data += linecount;
510 count -= linecount;
511 }
512}
513#else
514#define DBGDATA(info, buf, size, label)
515#endif
516
517#ifdef DBGTBUF
518static void dump_tbufs(struct slgt_info *info)
519{
520 int i;
521 printk("tbuf_current=%d\n", info->tbuf_current);
522 for (i=0 ; i < info->tbuf_count ; i++) {
523 printk("%d: count=%04X status=%04X\n",
524 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
525 }
526}
527#else
528#define DBGTBUF(info)
529#endif
530
531#ifdef DBGRBUF
532static void dump_rbufs(struct slgt_info *info)
533{
534 int i;
535 printk("rbuf_current=%d\n", info->rbuf_current);
536 for (i=0 ; i < info->rbuf_count ; i++) {
537 printk("%d: count=%04X status=%04X\n",
538 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
539 }
540}
541#else
542#define DBGRBUF(info)
543#endif
544
545static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
546{
547#ifdef SANITY_CHECK
548 if (!info) {
549 printk("null struct slgt_info for (%s) in %s\n", devname, name);
550 return 1;
551 }
552#else
553 if (!info)
554 return 1;
555#endif
556 return 0;
557}
558
559/*
560 * line discipline callback wrappers
561 *
562 * The wrappers maintain line discipline references
563 * while calling into the line discipline.
564 *
565 * ldisc_receive_buf - pass receive data to line discipline
566 */
567static void ldisc_receive_buf(struct tty_struct *tty,
568 const __u8 *data, char *flags, int count)
569{
570 struct tty_ldisc *ld;
571 if (!tty)
572 return;
573 ld = tty_ldisc_ref(tty);
574 if (ld) {
575 if (ld->ops->receive_buf)
576 ld->ops->receive_buf(tty, data, flags, count);
577 tty_ldisc_deref(ld);
578 }
579}
580
581/* tty callbacks */
582
583static int open(struct tty_struct *tty, struct file *filp)
584{
585 struct slgt_info *info;
586 int retval, line;
587 unsigned long flags;
588
589 line = tty->index;
590 if (line >= slgt_device_count) {
591 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
592 return -ENODEV;
593 }
594
595 info = slgt_device_list;
596 while(info && info->line != line)
597 info = info->next_device;
598 if (sanity_check(info, tty->name, "open"))
599 return -ENODEV;
600 if (info->init_error) {
601 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
602 return -ENODEV;
603 }
604
605 tty->driver_data = info;
606 info->port.tty = tty;
607
608 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
609
610 mutex_lock(&info->port.mutex);
611
612 spin_lock_irqsave(&info->netlock, flags);
613 if (info->netcount) {
614 retval = -EBUSY;
615 spin_unlock_irqrestore(&info->netlock, flags);
616 mutex_unlock(&info->port.mutex);
617 goto cleanup;
618 }
619 info->port.count++;
620 spin_unlock_irqrestore(&info->netlock, flags);
621
622 if (info->port.count == 1) {
623 /* 1st open on this device, init hardware */
624 retval = startup(info);
625 if (retval < 0) {
626 mutex_unlock(&info->port.mutex);
627 goto cleanup;
628 }
629 }
630 mutex_unlock(&info->port.mutex);
631 retval = block_til_ready(tty, filp, info);
632 if (retval) {
633 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
634 goto cleanup;
635 }
636
637 retval = 0;
638
639cleanup:
640 if (retval) {
641 if (tty->count == 1)
642 info->port.tty = NULL; /* tty layer will release tty struct */
643 if(info->port.count)
644 info->port.count--;
645 }
646
647 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
648 return retval;
649}
650
651static void close(struct tty_struct *tty, struct file *filp)
652{
653 struct slgt_info *info = tty->driver_data;
654
655 if (sanity_check(info, tty->name, "close"))
656 return;
657 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
658
659 if (tty_port_close_start(&info->port, tty, filp) == 0)
660 goto cleanup;
661
662 mutex_lock(&info->port.mutex);
663 if (tty_port_initialized(&info->port))
664 wait_until_sent(tty, info->timeout);
665 flush_buffer(tty);
666 tty_ldisc_flush(tty);
667
668 shutdown(info);
669 mutex_unlock(&info->port.mutex);
670
671 tty_port_close_end(&info->port, tty);
672 info->port.tty = NULL;
673cleanup:
674 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
675}
676
677static void hangup(struct tty_struct *tty)
678{
679 struct slgt_info *info = tty->driver_data;
680 unsigned long flags;
681
682 if (sanity_check(info, tty->name, "hangup"))
683 return;
684 DBGINFO(("%s hangup\n", info->device_name));
685
686 flush_buffer(tty);
687
688 mutex_lock(&info->port.mutex);
689 shutdown(info);
690
691 spin_lock_irqsave(&info->port.lock, flags);
692 info->port.count = 0;
693 info->port.tty = NULL;
694 spin_unlock_irqrestore(&info->port.lock, flags);
695 tty_port_set_active(&info->port, false);
696 mutex_unlock(&info->port.mutex);
697
698 wake_up_interruptible(&info->port.open_wait);
699}
700
701static void set_termios(struct tty_struct *tty,
702 const struct ktermios *old_termios)
703{
704 struct slgt_info *info = tty->driver_data;
705 unsigned long flags;
706
707 DBGINFO(("%s set_termios\n", tty->driver->name));
708
709 change_params(info);
710
711 /* Handle transition to B0 status */
712 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
713 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
714 spin_lock_irqsave(&info->lock,flags);
715 set_gtsignals(info);
716 spin_unlock_irqrestore(&info->lock,flags);
717 }
718
719 /* Handle transition away from B0 status */
720 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
721 info->signals |= SerialSignal_DTR;
722 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
723 info->signals |= SerialSignal_RTS;
724 spin_lock_irqsave(&info->lock,flags);
725 set_gtsignals(info);
726 spin_unlock_irqrestore(&info->lock,flags);
727 }
728
729 /* Handle turning off CRTSCTS */
730 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
731 tty->hw_stopped = false;
732 tx_release(tty);
733 }
734}
735
736static void update_tx_timer(struct slgt_info *info)
737{
738 /*
739 * use worst case speed of 1200bps to calculate transmit timeout
740 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
741 */
742 if (info->params.mode == MGSL_MODE_HDLC) {
743 int timeout = (tbuf_bytes(info) * 7) + 1000;
744 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
745 }
746}
747
748static ssize_t write(struct tty_struct *tty, const u8 *buf, size_t count)
749{
750 int ret = 0;
751 struct slgt_info *info = tty->driver_data;
752 unsigned long flags;
753
754 if (sanity_check(info, tty->name, "write"))
755 return -EIO;
756
757 DBGINFO(("%s write count=%zu\n", info->device_name, count));
758
759 if (!info->tx_buf || (count > info->max_frame_size))
760 return -EIO;
761
762 if (!count || tty->flow.stopped || tty->hw_stopped)
763 return 0;
764
765 spin_lock_irqsave(&info->lock, flags);
766
767 if (info->tx_count) {
768 /* send accumulated data from send_char() */
769 if (!tx_load(info, info->tx_buf, info->tx_count))
770 goto cleanup;
771 info->tx_count = 0;
772 }
773
774 if (tx_load(info, buf, count))
775 ret = count;
776
777cleanup:
778 spin_unlock_irqrestore(&info->lock, flags);
779 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
780 return ret;
781}
782
783static int put_char(struct tty_struct *tty, u8 ch)
784{
785 struct slgt_info *info = tty->driver_data;
786 unsigned long flags;
787 int ret = 0;
788
789 if (sanity_check(info, tty->name, "put_char"))
790 return 0;
791 DBGINFO(("%s put_char(%u)\n", info->device_name, ch));
792 if (!info->tx_buf)
793 return 0;
794 spin_lock_irqsave(&info->lock,flags);
795 if (info->tx_count < info->max_frame_size) {
796 info->tx_buf[info->tx_count++] = ch;
797 ret = 1;
798 }
799 spin_unlock_irqrestore(&info->lock,flags);
800 return ret;
801}
802
803static void send_xchar(struct tty_struct *tty, char ch)
804{
805 struct slgt_info *info = tty->driver_data;
806 unsigned long flags;
807
808 if (sanity_check(info, tty->name, "send_xchar"))
809 return;
810 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
811 info->x_char = ch;
812 if (ch) {
813 spin_lock_irqsave(&info->lock,flags);
814 if (!info->tx_enabled)
815 tx_start(info);
816 spin_unlock_irqrestore(&info->lock,flags);
817 }
818}
819
820static void wait_until_sent(struct tty_struct *tty, int timeout)
821{
822 struct slgt_info *info = tty->driver_data;
823 unsigned long orig_jiffies, char_time;
824
825 if (!info )
826 return;
827 if (sanity_check(info, tty->name, "wait_until_sent"))
828 return;
829 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
830 if (!tty_port_initialized(&info->port))
831 goto exit;
832
833 orig_jiffies = jiffies;
834
835 /* Set check interval to 1/5 of estimated time to
836 * send a character, and make it at least 1. The check
837 * interval should also be less than the timeout.
838 * Note: use tight timings here to satisfy the NIST-PCTS.
839 */
840
841 if (info->params.data_rate) {
842 char_time = info->timeout/(32 * 5);
843 if (!char_time)
844 char_time++;
845 } else
846 char_time = 1;
847
848 if (timeout)
849 char_time = min_t(unsigned long, char_time, timeout);
850
851 while (info->tx_active) {
852 msleep_interruptible(jiffies_to_msecs(char_time));
853 if (signal_pending(current))
854 break;
855 if (timeout && time_after(jiffies, orig_jiffies + timeout))
856 break;
857 }
858exit:
859 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
860}
861
862static unsigned int write_room(struct tty_struct *tty)
863{
864 struct slgt_info *info = tty->driver_data;
865 unsigned int ret;
866
867 if (sanity_check(info, tty->name, "write_room"))
868 return 0;
869 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
870 DBGINFO(("%s write_room=%u\n", info->device_name, ret));
871 return ret;
872}
873
874static void flush_chars(struct tty_struct *tty)
875{
876 struct slgt_info *info = tty->driver_data;
877 unsigned long flags;
878
879 if (sanity_check(info, tty->name, "flush_chars"))
880 return;
881 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
882
883 if (info->tx_count <= 0 || tty->flow.stopped ||
884 tty->hw_stopped || !info->tx_buf)
885 return;
886
887 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
888
889 spin_lock_irqsave(&info->lock,flags);
890 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
891 info->tx_count = 0;
892 spin_unlock_irqrestore(&info->lock,flags);
893}
894
895static void flush_buffer(struct tty_struct *tty)
896{
897 struct slgt_info *info = tty->driver_data;
898 unsigned long flags;
899
900 if (sanity_check(info, tty->name, "flush_buffer"))
901 return;
902 DBGINFO(("%s flush_buffer\n", info->device_name));
903
904 spin_lock_irqsave(&info->lock, flags);
905 info->tx_count = 0;
906 spin_unlock_irqrestore(&info->lock, flags);
907
908 tty_wakeup(tty);
909}
910
911/*
912 * throttle (stop) transmitter
913 */
914static void tx_hold(struct tty_struct *tty)
915{
916 struct slgt_info *info = tty->driver_data;
917 unsigned long flags;
918
919 if (sanity_check(info, tty->name, "tx_hold"))
920 return;
921 DBGINFO(("%s tx_hold\n", info->device_name));
922 spin_lock_irqsave(&info->lock,flags);
923 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
924 tx_stop(info);
925 spin_unlock_irqrestore(&info->lock,flags);
926}
927
928/*
929 * release (start) transmitter
930 */
931static void tx_release(struct tty_struct *tty)
932{
933 struct slgt_info *info = tty->driver_data;
934 unsigned long flags;
935
936 if (sanity_check(info, tty->name, "tx_release"))
937 return;
938 DBGINFO(("%s tx_release\n", info->device_name));
939 spin_lock_irqsave(&info->lock, flags);
940 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
941 info->tx_count = 0;
942 spin_unlock_irqrestore(&info->lock, flags);
943}
944
945/*
946 * Service an IOCTL request
947 *
948 * Arguments
949 *
950 * tty pointer to tty instance data
951 * cmd IOCTL command code
952 * arg command argument/context
953 *
954 * Return 0 if success, otherwise error code
955 */
956static int ioctl(struct tty_struct *tty,
957 unsigned int cmd, unsigned long arg)
958{
959 struct slgt_info *info = tty->driver_data;
960 void __user *argp = (void __user *)arg;
961 int ret;
962
963 if (sanity_check(info, tty->name, "ioctl"))
964 return -ENODEV;
965 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
966
967 if (cmd != TIOCMIWAIT) {
968 if (tty_io_error(tty))
969 return -EIO;
970 }
971
972 switch (cmd) {
973 case MGSL_IOCWAITEVENT:
974 return wait_mgsl_event(info, argp);
975 case TIOCMIWAIT:
976 return modem_input_wait(info,(int)arg);
977 case MGSL_IOCSGPIO:
978 return set_gpio(info, argp);
979 case MGSL_IOCGGPIO:
980 return get_gpio(info, argp);
981 case MGSL_IOCWAITGPIO:
982 return wait_gpio(info, argp);
983 case MGSL_IOCGXSYNC:
984 return get_xsync(info, argp);
985 case MGSL_IOCSXSYNC:
986 return set_xsync(info, (int)arg);
987 case MGSL_IOCGXCTRL:
988 return get_xctrl(info, argp);
989 case MGSL_IOCSXCTRL:
990 return set_xctrl(info, (int)arg);
991 }
992 mutex_lock(&info->port.mutex);
993 switch (cmd) {
994 case MGSL_IOCGPARAMS:
995 ret = get_params(info, argp);
996 break;
997 case MGSL_IOCSPARAMS:
998 ret = set_params(info, argp);
999 break;
1000 case MGSL_IOCGTXIDLE:
1001 ret = get_txidle(info, argp);
1002 break;
1003 case MGSL_IOCSTXIDLE:
1004 ret = set_txidle(info, (int)arg);
1005 break;
1006 case MGSL_IOCTXENABLE:
1007 ret = tx_enable(info, (int)arg);
1008 break;
1009 case MGSL_IOCRXENABLE:
1010 ret = rx_enable(info, (int)arg);
1011 break;
1012 case MGSL_IOCTXABORT:
1013 ret = tx_abort(info);
1014 break;
1015 case MGSL_IOCGSTATS:
1016 ret = get_stats(info, argp);
1017 break;
1018 case MGSL_IOCGIF:
1019 ret = get_interface(info, argp);
1020 break;
1021 case MGSL_IOCSIF:
1022 ret = set_interface(info,(int)arg);
1023 break;
1024 default:
1025 ret = -ENOIOCTLCMD;
1026 }
1027 mutex_unlock(&info->port.mutex);
1028 return ret;
1029}
1030
1031static int get_icount(struct tty_struct *tty,
1032 struct serial_icounter_struct *icount)
1033
1034{
1035 struct slgt_info *info = tty->driver_data;
1036 struct mgsl_icount cnow; /* kernel counter temps */
1037 unsigned long flags;
1038
1039 spin_lock_irqsave(&info->lock,flags);
1040 cnow = info->icount;
1041 spin_unlock_irqrestore(&info->lock,flags);
1042
1043 icount->cts = cnow.cts;
1044 icount->dsr = cnow.dsr;
1045 icount->rng = cnow.rng;
1046 icount->dcd = cnow.dcd;
1047 icount->rx = cnow.rx;
1048 icount->tx = cnow.tx;
1049 icount->frame = cnow.frame;
1050 icount->overrun = cnow.overrun;
1051 icount->parity = cnow.parity;
1052 icount->brk = cnow.brk;
1053 icount->buf_overrun = cnow.buf_overrun;
1054
1055 return 0;
1056}
1057
1058/*
1059 * support for 32 bit ioctl calls on 64 bit systems
1060 */
1061#ifdef CONFIG_COMPAT
1062static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1063{
1064 struct MGSL_PARAMS32 tmp_params;
1065
1066 DBGINFO(("%s get_params32\n", info->device_name));
1067 memset(&tmp_params, 0, sizeof(tmp_params));
1068 tmp_params.mode = (compat_ulong_t)info->params.mode;
1069 tmp_params.loopback = info->params.loopback;
1070 tmp_params.flags = info->params.flags;
1071 tmp_params.encoding = info->params.encoding;
1072 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1073 tmp_params.addr_filter = info->params.addr_filter;
1074 tmp_params.crc_type = info->params.crc_type;
1075 tmp_params.preamble_length = info->params.preamble_length;
1076 tmp_params.preamble = info->params.preamble;
1077 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1078 tmp_params.data_bits = info->params.data_bits;
1079 tmp_params.stop_bits = info->params.stop_bits;
1080 tmp_params.parity = info->params.parity;
1081 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1082 return -EFAULT;
1083 return 0;
1084}
1085
1086static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1087{
1088 struct MGSL_PARAMS32 tmp_params;
1089 unsigned long flags;
1090
1091 DBGINFO(("%s set_params32\n", info->device_name));
1092 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1093 return -EFAULT;
1094
1095 spin_lock_irqsave(&info->lock, flags);
1096 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1097 info->base_clock = tmp_params.clock_speed;
1098 } else {
1099 info->params.mode = tmp_params.mode;
1100 info->params.loopback = tmp_params.loopback;
1101 info->params.flags = tmp_params.flags;
1102 info->params.encoding = tmp_params.encoding;
1103 info->params.clock_speed = tmp_params.clock_speed;
1104 info->params.addr_filter = tmp_params.addr_filter;
1105 info->params.crc_type = tmp_params.crc_type;
1106 info->params.preamble_length = tmp_params.preamble_length;
1107 info->params.preamble = tmp_params.preamble;
1108 info->params.data_rate = tmp_params.data_rate;
1109 info->params.data_bits = tmp_params.data_bits;
1110 info->params.stop_bits = tmp_params.stop_bits;
1111 info->params.parity = tmp_params.parity;
1112 }
1113 spin_unlock_irqrestore(&info->lock, flags);
1114
1115 program_hw(info);
1116
1117 return 0;
1118}
1119
1120static long slgt_compat_ioctl(struct tty_struct *tty,
1121 unsigned int cmd, unsigned long arg)
1122{
1123 struct slgt_info *info = tty->driver_data;
1124 int rc;
1125
1126 if (sanity_check(info, tty->name, "compat_ioctl"))
1127 return -ENODEV;
1128 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1129
1130 switch (cmd) {
1131 case MGSL_IOCSPARAMS32:
1132 rc = set_params32(info, compat_ptr(arg));
1133 break;
1134
1135 case MGSL_IOCGPARAMS32:
1136 rc = get_params32(info, compat_ptr(arg));
1137 break;
1138
1139 case MGSL_IOCGPARAMS:
1140 case MGSL_IOCSPARAMS:
1141 case MGSL_IOCGTXIDLE:
1142 case MGSL_IOCGSTATS:
1143 case MGSL_IOCWAITEVENT:
1144 case MGSL_IOCGIF:
1145 case MGSL_IOCSGPIO:
1146 case MGSL_IOCGGPIO:
1147 case MGSL_IOCWAITGPIO:
1148 case MGSL_IOCGXSYNC:
1149 case MGSL_IOCGXCTRL:
1150 rc = ioctl(tty, cmd, (unsigned long)compat_ptr(arg));
1151 break;
1152 default:
1153 rc = ioctl(tty, cmd, arg);
1154 }
1155 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1156 return rc;
1157}
1158#else
1159#define slgt_compat_ioctl NULL
1160#endif /* ifdef CONFIG_COMPAT */
1161
1162/*
1163 * proc fs support
1164 */
1165static inline void line_info(struct seq_file *m, struct slgt_info *info)
1166{
1167 char stat_buf[30];
1168 unsigned long flags;
1169
1170 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1171 info->device_name, info->phys_reg_addr,
1172 info->irq_level, info->max_frame_size);
1173
1174 /* output current serial signal states */
1175 spin_lock_irqsave(&info->lock,flags);
1176 get_gtsignals(info);
1177 spin_unlock_irqrestore(&info->lock,flags);
1178
1179 stat_buf[0] = 0;
1180 stat_buf[1] = 0;
1181 if (info->signals & SerialSignal_RTS)
1182 strcat(stat_buf, "|RTS");
1183 if (info->signals & SerialSignal_CTS)
1184 strcat(stat_buf, "|CTS");
1185 if (info->signals & SerialSignal_DTR)
1186 strcat(stat_buf, "|DTR");
1187 if (info->signals & SerialSignal_DSR)
1188 strcat(stat_buf, "|DSR");
1189 if (info->signals & SerialSignal_DCD)
1190 strcat(stat_buf, "|CD");
1191 if (info->signals & SerialSignal_RI)
1192 strcat(stat_buf, "|RI");
1193
1194 if (info->params.mode != MGSL_MODE_ASYNC) {
1195 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1196 info->icount.txok, info->icount.rxok);
1197 if (info->icount.txunder)
1198 seq_printf(m, " txunder:%d", info->icount.txunder);
1199 if (info->icount.txabort)
1200 seq_printf(m, " txabort:%d", info->icount.txabort);
1201 if (info->icount.rxshort)
1202 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1203 if (info->icount.rxlong)
1204 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1205 if (info->icount.rxover)
1206 seq_printf(m, " rxover:%d", info->icount.rxover);
1207 if (info->icount.rxcrc)
1208 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1209 } else {
1210 seq_printf(m, "\tASYNC tx:%d rx:%d",
1211 info->icount.tx, info->icount.rx);
1212 if (info->icount.frame)
1213 seq_printf(m, " fe:%d", info->icount.frame);
1214 if (info->icount.parity)
1215 seq_printf(m, " pe:%d", info->icount.parity);
1216 if (info->icount.brk)
1217 seq_printf(m, " brk:%d", info->icount.brk);
1218 if (info->icount.overrun)
1219 seq_printf(m, " oe:%d", info->icount.overrun);
1220 }
1221
1222 /* Append serial signal status to end */
1223 seq_printf(m, " %s\n", stat_buf+1);
1224
1225 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1226 info->tx_active,info->bh_requested,info->bh_running,
1227 info->pending_bh);
1228}
1229
1230/* Called to print information about devices
1231 */
1232static int synclink_gt_proc_show(struct seq_file *m, void *v)
1233{
1234 struct slgt_info *info;
1235
1236 seq_puts(m, "synclink_gt driver\n");
1237
1238 info = slgt_device_list;
1239 while( info ) {
1240 line_info(m, info);
1241 info = info->next_device;
1242 }
1243 return 0;
1244}
1245
1246/*
1247 * return count of bytes in transmit buffer
1248 */
1249static unsigned int chars_in_buffer(struct tty_struct *tty)
1250{
1251 struct slgt_info *info = tty->driver_data;
1252 unsigned int count;
1253 if (sanity_check(info, tty->name, "chars_in_buffer"))
1254 return 0;
1255 count = tbuf_bytes(info);
1256 DBGINFO(("%s chars_in_buffer()=%u\n", info->device_name, count));
1257 return count;
1258}
1259
1260/*
1261 * signal remote device to throttle send data (our receive data)
1262 */
1263static void throttle(struct tty_struct * tty)
1264{
1265 struct slgt_info *info = tty->driver_data;
1266 unsigned long flags;
1267
1268 if (sanity_check(info, tty->name, "throttle"))
1269 return;
1270 DBGINFO(("%s throttle\n", info->device_name));
1271 if (I_IXOFF(tty))
1272 send_xchar(tty, STOP_CHAR(tty));
1273 if (C_CRTSCTS(tty)) {
1274 spin_lock_irqsave(&info->lock,flags);
1275 info->signals &= ~SerialSignal_RTS;
1276 set_gtsignals(info);
1277 spin_unlock_irqrestore(&info->lock,flags);
1278 }
1279}
1280
1281/*
1282 * signal remote device to stop throttling send data (our receive data)
1283 */
1284static void unthrottle(struct tty_struct * tty)
1285{
1286 struct slgt_info *info = tty->driver_data;
1287 unsigned long flags;
1288
1289 if (sanity_check(info, tty->name, "unthrottle"))
1290 return;
1291 DBGINFO(("%s unthrottle\n", info->device_name));
1292 if (I_IXOFF(tty)) {
1293 if (info->x_char)
1294 info->x_char = 0;
1295 else
1296 send_xchar(tty, START_CHAR(tty));
1297 }
1298 if (C_CRTSCTS(tty)) {
1299 spin_lock_irqsave(&info->lock,flags);
1300 info->signals |= SerialSignal_RTS;
1301 set_gtsignals(info);
1302 spin_unlock_irqrestore(&info->lock,flags);
1303 }
1304}
1305
1306/*
1307 * set or clear transmit break condition
1308 * break_state -1=set break condition, 0=clear
1309 */
1310static int set_break(struct tty_struct *tty, int break_state)
1311{
1312 struct slgt_info *info = tty->driver_data;
1313 unsigned short value;
1314 unsigned long flags;
1315
1316 if (sanity_check(info, tty->name, "set_break"))
1317 return -EINVAL;
1318 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1319
1320 spin_lock_irqsave(&info->lock,flags);
1321 value = rd_reg16(info, TCR);
1322 if (break_state == -1)
1323 value |= BIT6;
1324 else
1325 value &= ~BIT6;
1326 wr_reg16(info, TCR, value);
1327 spin_unlock_irqrestore(&info->lock,flags);
1328 return 0;
1329}
1330
1331#if SYNCLINK_GENERIC_HDLC
1332
1333/**
1334 * hdlcdev_attach - called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1335 * @dev: pointer to network device structure
1336 * @encoding: serial encoding setting
1337 * @parity: FCS setting
1338 *
1339 * Set encoding and frame check sequence (FCS) options.
1340 *
1341 * Return: 0 if success, otherwise error code
1342 */
1343static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1344 unsigned short parity)
1345{
1346 struct slgt_info *info = dev_to_port(dev);
1347 unsigned char new_encoding;
1348 unsigned short new_crctype;
1349
1350 /* return error if TTY interface open */
1351 if (info->port.count)
1352 return -EBUSY;
1353
1354 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1355
1356 switch (encoding)
1357 {
1358 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1359 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1360 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1361 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1362 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1363 default: return -EINVAL;
1364 }
1365
1366 switch (parity)
1367 {
1368 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1369 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1370 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1371 default: return -EINVAL;
1372 }
1373
1374 info->params.encoding = new_encoding;
1375 info->params.crc_type = new_crctype;
1376
1377 /* if network interface up, reprogram hardware */
1378 if (info->netcount)
1379 program_hw(info);
1380
1381 return 0;
1382}
1383
1384/**
1385 * hdlcdev_xmit - called by generic HDLC layer to send a frame
1386 * @skb: socket buffer containing HDLC frame
1387 * @dev: pointer to network device structure
1388 */
1389static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1390 struct net_device *dev)
1391{
1392 struct slgt_info *info = dev_to_port(dev);
1393 unsigned long flags;
1394
1395 DBGINFO(("%s hdlc_xmit\n", dev->name));
1396
1397 if (!skb->len)
1398 return NETDEV_TX_OK;
1399
1400 /* stop sending until this frame completes */
1401 netif_stop_queue(dev);
1402
1403 /* update network statistics */
1404 dev->stats.tx_packets++;
1405 dev->stats.tx_bytes += skb->len;
1406
1407 /* save start time for transmit timeout detection */
1408 netif_trans_update(dev);
1409
1410 spin_lock_irqsave(&info->lock, flags);
1411 tx_load(info, skb->data, skb->len);
1412 spin_unlock_irqrestore(&info->lock, flags);
1413
1414 /* done with socket buffer, so free it */
1415 dev_kfree_skb(skb);
1416
1417 return NETDEV_TX_OK;
1418}
1419
1420/**
1421 * hdlcdev_open - called by network layer when interface enabled
1422 * @dev: pointer to network device structure
1423 *
1424 * Claim resources and initialize hardware.
1425 *
1426 * Return: 0 if success, otherwise error code
1427 */
1428static int hdlcdev_open(struct net_device *dev)
1429{
1430 struct slgt_info *info = dev_to_port(dev);
1431 int rc;
1432 unsigned long flags;
1433
1434 DBGINFO(("%s hdlcdev_open\n", dev->name));
1435
1436 /* arbitrate between network and tty opens */
1437 spin_lock_irqsave(&info->netlock, flags);
1438 if (info->port.count != 0 || info->netcount != 0) {
1439 DBGINFO(("%s hdlc_open busy\n", dev->name));
1440 spin_unlock_irqrestore(&info->netlock, flags);
1441 return -EBUSY;
1442 }
1443 info->netcount=1;
1444 spin_unlock_irqrestore(&info->netlock, flags);
1445
1446 /* claim resources and init adapter */
1447 if ((rc = startup(info)) != 0) {
1448 spin_lock_irqsave(&info->netlock, flags);
1449 info->netcount=0;
1450 spin_unlock_irqrestore(&info->netlock, flags);
1451 return rc;
1452 }
1453
1454 /* generic HDLC layer open processing */
1455 rc = hdlc_open(dev);
1456 if (rc) {
1457 shutdown(info);
1458 spin_lock_irqsave(&info->netlock, flags);
1459 info->netcount = 0;
1460 spin_unlock_irqrestore(&info->netlock, flags);
1461 return rc;
1462 }
1463
1464 /* assert RTS and DTR, apply hardware settings */
1465 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1466 program_hw(info);
1467
1468 /* enable network layer transmit */
1469 netif_trans_update(dev);
1470 netif_start_queue(dev);
1471
1472 /* inform generic HDLC layer of current DCD status */
1473 spin_lock_irqsave(&info->lock, flags);
1474 get_gtsignals(info);
1475 spin_unlock_irqrestore(&info->lock, flags);
1476 if (info->signals & SerialSignal_DCD)
1477 netif_carrier_on(dev);
1478 else
1479 netif_carrier_off(dev);
1480 return 0;
1481}
1482
1483/**
1484 * hdlcdev_close - called by network layer when interface is disabled
1485 * @dev: pointer to network device structure
1486 *
1487 * Shutdown hardware and release resources.
1488 *
1489 * Return: 0 if success, otherwise error code
1490 */
1491static int hdlcdev_close(struct net_device *dev)
1492{
1493 struct slgt_info *info = dev_to_port(dev);
1494 unsigned long flags;
1495
1496 DBGINFO(("%s hdlcdev_close\n", dev->name));
1497
1498 netif_stop_queue(dev);
1499
1500 /* shutdown adapter and release resources */
1501 shutdown(info);
1502
1503 hdlc_close(dev);
1504
1505 spin_lock_irqsave(&info->netlock, flags);
1506 info->netcount=0;
1507 spin_unlock_irqrestore(&info->netlock, flags);
1508
1509 return 0;
1510}
1511
1512/**
1513 * hdlcdev_ioctl - called by network layer to process IOCTL call to network device
1514 * @dev: pointer to network device structure
1515 * @ifr: pointer to network interface request structure
1516 * @cmd: IOCTL command code
1517 *
1518 * Return: 0 if success, otherwise error code
1519 */
1520static int hdlcdev_ioctl(struct net_device *dev, struct if_settings *ifs)
1521{
1522 const size_t size = sizeof(sync_serial_settings);
1523 sync_serial_settings new_line;
1524 sync_serial_settings __user *line = ifs->ifs_ifsu.sync;
1525 struct slgt_info *info = dev_to_port(dev);
1526 unsigned int flags;
1527
1528 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1529
1530 /* return error if TTY interface open */
1531 if (info->port.count)
1532 return -EBUSY;
1533
1534 memset(&new_line, 0, sizeof(new_line));
1535
1536 switch (ifs->type) {
1537 case IF_GET_IFACE: /* return current sync_serial_settings */
1538
1539 ifs->type = IF_IFACE_SYNC_SERIAL;
1540 if (ifs->size < size) {
1541 ifs->size = size; /* data size wanted */
1542 return -ENOBUFS;
1543 }
1544
1545 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1546 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1547 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1548 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1549
1550 switch (flags){
1551 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1552 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1553 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1554 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1555 default: new_line.clock_type = CLOCK_DEFAULT;
1556 }
1557
1558 new_line.clock_rate = info->params.clock_speed;
1559 new_line.loopback = info->params.loopback ? 1:0;
1560
1561 if (copy_to_user(line, &new_line, size))
1562 return -EFAULT;
1563 return 0;
1564
1565 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1566
1567 if(!capable(CAP_NET_ADMIN))
1568 return -EPERM;
1569 if (copy_from_user(&new_line, line, size))
1570 return -EFAULT;
1571
1572 switch (new_line.clock_type)
1573 {
1574 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1575 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1576 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1577 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1578 case CLOCK_DEFAULT: flags = info->params.flags &
1579 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1580 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1581 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1582 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1583 default: return -EINVAL;
1584 }
1585
1586 if (new_line.loopback != 0 && new_line.loopback != 1)
1587 return -EINVAL;
1588
1589 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1590 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1591 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1592 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1593 info->params.flags |= flags;
1594
1595 info->params.loopback = new_line.loopback;
1596
1597 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1598 info->params.clock_speed = new_line.clock_rate;
1599 else
1600 info->params.clock_speed = 0;
1601
1602 /* if network interface up, reprogram hardware */
1603 if (info->netcount)
1604 program_hw(info);
1605 return 0;
1606
1607 default:
1608 return hdlc_ioctl(dev, ifs);
1609 }
1610}
1611
1612/**
1613 * hdlcdev_tx_timeout - called by network layer when transmit timeout is detected
1614 * @dev: pointer to network device structure
1615 * @txqueue: unused
1616 */
1617static void hdlcdev_tx_timeout(struct net_device *dev, unsigned int txqueue)
1618{
1619 struct slgt_info *info = dev_to_port(dev);
1620 unsigned long flags;
1621
1622 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1623
1624 dev->stats.tx_errors++;
1625 dev->stats.tx_aborted_errors++;
1626
1627 spin_lock_irqsave(&info->lock,flags);
1628 tx_stop(info);
1629 spin_unlock_irqrestore(&info->lock,flags);
1630
1631 netif_wake_queue(dev);
1632}
1633
1634/**
1635 * hdlcdev_tx_done - called by device driver when transmit completes
1636 * @info: pointer to device instance information
1637 *
1638 * Reenable network layer transmit if stopped.
1639 */
1640static void hdlcdev_tx_done(struct slgt_info *info)
1641{
1642 if (netif_queue_stopped(info->netdev))
1643 netif_wake_queue(info->netdev);
1644}
1645
1646/**
1647 * hdlcdev_rx - called by device driver when frame received
1648 * @info: pointer to device instance information
1649 * @buf: pointer to buffer contianing frame data
1650 * @size: count of data bytes in buf
1651 *
1652 * Pass frame to network layer.
1653 */
1654static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1655{
1656 struct sk_buff *skb = dev_alloc_skb(size);
1657 struct net_device *dev = info->netdev;
1658
1659 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1660
1661 if (skb == NULL) {
1662 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1663 dev->stats.rx_dropped++;
1664 return;
1665 }
1666
1667 skb_put_data(skb, buf, size);
1668
1669 skb->protocol = hdlc_type_trans(skb, dev);
1670
1671 dev->stats.rx_packets++;
1672 dev->stats.rx_bytes += size;
1673
1674 netif_rx(skb);
1675}
1676
1677static const struct net_device_ops hdlcdev_ops = {
1678 .ndo_open = hdlcdev_open,
1679 .ndo_stop = hdlcdev_close,
1680 .ndo_start_xmit = hdlc_start_xmit,
1681 .ndo_siocwandev = hdlcdev_ioctl,
1682 .ndo_tx_timeout = hdlcdev_tx_timeout,
1683};
1684
1685/**
1686 * hdlcdev_init - called by device driver when adding device instance
1687 * @info: pointer to device instance information
1688 *
1689 * Do generic HDLC initialization.
1690 *
1691 * Return: 0 if success, otherwise error code
1692 */
1693static int hdlcdev_init(struct slgt_info *info)
1694{
1695 int rc;
1696 struct net_device *dev;
1697 hdlc_device *hdlc;
1698
1699 /* allocate and initialize network and HDLC layer objects */
1700
1701 dev = alloc_hdlcdev(info);
1702 if (!dev) {
1703 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1704 return -ENOMEM;
1705 }
1706
1707 /* for network layer reporting purposes only */
1708 dev->mem_start = info->phys_reg_addr;
1709 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1710 dev->irq = info->irq_level;
1711
1712 /* network layer callbacks and settings */
1713 dev->netdev_ops = &hdlcdev_ops;
1714 dev->watchdog_timeo = 10 * HZ;
1715 dev->tx_queue_len = 50;
1716
1717 /* generic HDLC layer callbacks and settings */
1718 hdlc = dev_to_hdlc(dev);
1719 hdlc->attach = hdlcdev_attach;
1720 hdlc->xmit = hdlcdev_xmit;
1721
1722 /* register objects with HDLC layer */
1723 rc = register_hdlc_device(dev);
1724 if (rc) {
1725 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1726 free_netdev(dev);
1727 return rc;
1728 }
1729
1730 info->netdev = dev;
1731 return 0;
1732}
1733
1734/**
1735 * hdlcdev_exit - called by device driver when removing device instance
1736 * @info: pointer to device instance information
1737 *
1738 * Do generic HDLC cleanup.
1739 */
1740static void hdlcdev_exit(struct slgt_info *info)
1741{
1742 if (!info->netdev)
1743 return;
1744 unregister_hdlc_device(info->netdev);
1745 free_netdev(info->netdev);
1746 info->netdev = NULL;
1747}
1748
1749#endif /* ifdef CONFIG_HDLC */
1750
1751/*
1752 * get async data from rx DMA buffers
1753 */
1754static void rx_async(struct slgt_info *info)
1755{
1756 struct mgsl_icount *icount = &info->icount;
1757 unsigned int start, end;
1758 unsigned char *p;
1759 unsigned char status;
1760 struct slgt_desc *bufs = info->rbufs;
1761 int i, count;
1762 int chars = 0;
1763 int stat;
1764 unsigned char ch;
1765
1766 start = end = info->rbuf_current;
1767
1768 while(desc_complete(bufs[end])) {
1769 count = desc_count(bufs[end]) - info->rbuf_index;
1770 p = bufs[end].buf + info->rbuf_index;
1771
1772 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1773 DBGDATA(info, p, count, "rx");
1774
1775 for(i=0 ; i < count; i+=2, p+=2) {
1776 ch = *p;
1777 icount->rx++;
1778
1779 stat = 0;
1780
1781 status = *(p + 1) & (BIT1 + BIT0);
1782 if (status) {
1783 if (status & BIT1)
1784 icount->parity++;
1785 else if (status & BIT0)
1786 icount->frame++;
1787 /* discard char if tty control flags say so */
1788 if (status & info->ignore_status_mask)
1789 continue;
1790 if (status & BIT1)
1791 stat = TTY_PARITY;
1792 else if (status & BIT0)
1793 stat = TTY_FRAME;
1794 }
1795 tty_insert_flip_char(&info->port, ch, stat);
1796 chars++;
1797 }
1798
1799 if (i < count) {
1800 /* receive buffer not completed */
1801 info->rbuf_index += i;
1802 mod_timer(&info->rx_timer, jiffies + 1);
1803 break;
1804 }
1805
1806 info->rbuf_index = 0;
1807 free_rbufs(info, end, end);
1808
1809 if (++end == info->rbuf_count)
1810 end = 0;
1811
1812 /* if entire list searched then no frame available */
1813 if (end == start)
1814 break;
1815 }
1816
1817 if (chars)
1818 tty_flip_buffer_push(&info->port);
1819}
1820
1821/*
1822 * return next bottom half action to perform
1823 */
1824static int bh_action(struct slgt_info *info)
1825{
1826 unsigned long flags;
1827 int rc;
1828
1829 spin_lock_irqsave(&info->lock,flags);
1830
1831 if (info->pending_bh & BH_RECEIVE) {
1832 info->pending_bh &= ~BH_RECEIVE;
1833 rc = BH_RECEIVE;
1834 } else if (info->pending_bh & BH_TRANSMIT) {
1835 info->pending_bh &= ~BH_TRANSMIT;
1836 rc = BH_TRANSMIT;
1837 } else if (info->pending_bh & BH_STATUS) {
1838 info->pending_bh &= ~BH_STATUS;
1839 rc = BH_STATUS;
1840 } else {
1841 /* Mark BH routine as complete */
1842 info->bh_running = false;
1843 info->bh_requested = false;
1844 rc = 0;
1845 }
1846
1847 spin_unlock_irqrestore(&info->lock,flags);
1848
1849 return rc;
1850}
1851
1852/*
1853 * perform bottom half processing
1854 */
1855static void bh_handler(struct work_struct *work)
1856{
1857 struct slgt_info *info = container_of(work, struct slgt_info, task);
1858 int action;
1859
1860 info->bh_running = true;
1861
1862 while((action = bh_action(info))) {
1863 switch (action) {
1864 case BH_RECEIVE:
1865 DBGBH(("%s bh receive\n", info->device_name));
1866 switch(info->params.mode) {
1867 case MGSL_MODE_ASYNC:
1868 rx_async(info);
1869 break;
1870 case MGSL_MODE_HDLC:
1871 while(rx_get_frame(info));
1872 break;
1873 case MGSL_MODE_RAW:
1874 case MGSL_MODE_MONOSYNC:
1875 case MGSL_MODE_BISYNC:
1876 case MGSL_MODE_XSYNC:
1877 while(rx_get_buf(info));
1878 break;
1879 }
1880 /* restart receiver if rx DMA buffers exhausted */
1881 if (info->rx_restart)
1882 rx_start(info);
1883 break;
1884 case BH_TRANSMIT:
1885 bh_transmit(info);
1886 break;
1887 case BH_STATUS:
1888 DBGBH(("%s bh status\n", info->device_name));
1889 info->ri_chkcount = 0;
1890 info->dsr_chkcount = 0;
1891 info->dcd_chkcount = 0;
1892 info->cts_chkcount = 0;
1893 break;
1894 default:
1895 DBGBH(("%s unknown action\n", info->device_name));
1896 break;
1897 }
1898 }
1899 DBGBH(("%s bh_handler exit\n", info->device_name));
1900}
1901
1902static void bh_transmit(struct slgt_info *info)
1903{
1904 struct tty_struct *tty = info->port.tty;
1905
1906 DBGBH(("%s bh_transmit\n", info->device_name));
1907 if (tty)
1908 tty_wakeup(tty);
1909}
1910
1911static void dsr_change(struct slgt_info *info, unsigned short status)
1912{
1913 if (status & BIT3) {
1914 info->signals |= SerialSignal_DSR;
1915 info->input_signal_events.dsr_up++;
1916 } else {
1917 info->signals &= ~SerialSignal_DSR;
1918 info->input_signal_events.dsr_down++;
1919 }
1920 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
1921 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1922 slgt_irq_off(info, IRQ_DSR);
1923 return;
1924 }
1925 info->icount.dsr++;
1926 wake_up_interruptible(&info->status_event_wait_q);
1927 wake_up_interruptible(&info->event_wait_q);
1928 info->pending_bh |= BH_STATUS;
1929}
1930
1931static void cts_change(struct slgt_info *info, unsigned short status)
1932{
1933 if (status & BIT2) {
1934 info->signals |= SerialSignal_CTS;
1935 info->input_signal_events.cts_up++;
1936 } else {
1937 info->signals &= ~SerialSignal_CTS;
1938 info->input_signal_events.cts_down++;
1939 }
1940 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
1941 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1942 slgt_irq_off(info, IRQ_CTS);
1943 return;
1944 }
1945 info->icount.cts++;
1946 wake_up_interruptible(&info->status_event_wait_q);
1947 wake_up_interruptible(&info->event_wait_q);
1948 info->pending_bh |= BH_STATUS;
1949
1950 if (tty_port_cts_enabled(&info->port)) {
1951 if (info->port.tty) {
1952 if (info->port.tty->hw_stopped) {
1953 if (info->signals & SerialSignal_CTS) {
1954 info->port.tty->hw_stopped = false;
1955 info->pending_bh |= BH_TRANSMIT;
1956 return;
1957 }
1958 } else {
1959 if (!(info->signals & SerialSignal_CTS))
1960 info->port.tty->hw_stopped = true;
1961 }
1962 }
1963 }
1964}
1965
1966static void dcd_change(struct slgt_info *info, unsigned short status)
1967{
1968 if (status & BIT1) {
1969 info->signals |= SerialSignal_DCD;
1970 info->input_signal_events.dcd_up++;
1971 } else {
1972 info->signals &= ~SerialSignal_DCD;
1973 info->input_signal_events.dcd_down++;
1974 }
1975 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
1976 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1977 slgt_irq_off(info, IRQ_DCD);
1978 return;
1979 }
1980 info->icount.dcd++;
1981#if SYNCLINK_GENERIC_HDLC
1982 if (info->netcount) {
1983 if (info->signals & SerialSignal_DCD)
1984 netif_carrier_on(info->netdev);
1985 else
1986 netif_carrier_off(info->netdev);
1987 }
1988#endif
1989 wake_up_interruptible(&info->status_event_wait_q);
1990 wake_up_interruptible(&info->event_wait_q);
1991 info->pending_bh |= BH_STATUS;
1992
1993 if (tty_port_check_carrier(&info->port)) {
1994 if (info->signals & SerialSignal_DCD)
1995 wake_up_interruptible(&info->port.open_wait);
1996 else {
1997 if (info->port.tty)
1998 tty_hangup(info->port.tty);
1999 }
2000 }
2001}
2002
2003static void ri_change(struct slgt_info *info, unsigned short status)
2004{
2005 if (status & BIT0) {
2006 info->signals |= SerialSignal_RI;
2007 info->input_signal_events.ri_up++;
2008 } else {
2009 info->signals &= ~SerialSignal_RI;
2010 info->input_signal_events.ri_down++;
2011 }
2012 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2013 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2014 slgt_irq_off(info, IRQ_RI);
2015 return;
2016 }
2017 info->icount.rng++;
2018 wake_up_interruptible(&info->status_event_wait_q);
2019 wake_up_interruptible(&info->event_wait_q);
2020 info->pending_bh |= BH_STATUS;
2021}
2022
2023static void isr_rxdata(struct slgt_info *info)
2024{
2025 unsigned int count = info->rbuf_fill_count;
2026 unsigned int i = info->rbuf_fill_index;
2027 unsigned short reg;
2028
2029 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2030 reg = rd_reg16(info, RDR);
2031 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2032 if (desc_complete(info->rbufs[i])) {
2033 /* all buffers full */
2034 rx_stop(info);
2035 info->rx_restart = true;
2036 continue;
2037 }
2038 info->rbufs[i].buf[count++] = (unsigned char)reg;
2039 /* async mode saves status byte to buffer for each data byte */
2040 if (info->params.mode == MGSL_MODE_ASYNC)
2041 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2042 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2043 /* buffer full or end of frame */
2044 set_desc_count(info->rbufs[i], count);
2045 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2046 info->rbuf_fill_count = count = 0;
2047 if (++i == info->rbuf_count)
2048 i = 0;
2049 info->pending_bh |= BH_RECEIVE;
2050 }
2051 }
2052
2053 info->rbuf_fill_index = i;
2054 info->rbuf_fill_count = count;
2055}
2056
2057static void isr_serial(struct slgt_info *info)
2058{
2059 unsigned short status = rd_reg16(info, SSR);
2060
2061 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2062
2063 wr_reg16(info, SSR, status); /* clear pending */
2064
2065 info->irq_occurred = true;
2066
2067 if (info->params.mode == MGSL_MODE_ASYNC) {
2068 if (status & IRQ_TXIDLE) {
2069 if (info->tx_active)
2070 isr_txeom(info, status);
2071 }
2072 if (info->rx_pio && (status & IRQ_RXDATA))
2073 isr_rxdata(info);
2074 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2075 info->icount.brk++;
2076 /* process break detection if tty control allows */
2077 if (info->port.tty) {
2078 if (!(status & info->ignore_status_mask)) {
2079 if (info->read_status_mask & MASK_BREAK) {
2080 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2081 if (info->port.flags & ASYNC_SAK)
2082 do_SAK(info->port.tty);
2083 }
2084 }
2085 }
2086 }
2087 } else {
2088 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2089 isr_txeom(info, status);
2090 if (info->rx_pio && (status & IRQ_RXDATA))
2091 isr_rxdata(info);
2092 if (status & IRQ_RXIDLE) {
2093 if (status & RXIDLE)
2094 info->icount.rxidle++;
2095 else
2096 info->icount.exithunt++;
2097 wake_up_interruptible(&info->event_wait_q);
2098 }
2099
2100 if (status & IRQ_RXOVER)
2101 rx_start(info);
2102 }
2103
2104 if (status & IRQ_DSR)
2105 dsr_change(info, status);
2106 if (status & IRQ_CTS)
2107 cts_change(info, status);
2108 if (status & IRQ_DCD)
2109 dcd_change(info, status);
2110 if (status & IRQ_RI)
2111 ri_change(info, status);
2112}
2113
2114static void isr_rdma(struct slgt_info *info)
2115{
2116 unsigned int status = rd_reg32(info, RDCSR);
2117
2118 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2119
2120 /* RDCSR (rx DMA control/status)
2121 *
2122 * 31..07 reserved
2123 * 06 save status byte to DMA buffer
2124 * 05 error
2125 * 04 eol (end of list)
2126 * 03 eob (end of buffer)
2127 * 02 IRQ enable
2128 * 01 reset
2129 * 00 enable
2130 */
2131 wr_reg32(info, RDCSR, status); /* clear pending */
2132
2133 if (status & (BIT5 + BIT4)) {
2134 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2135 info->rx_restart = true;
2136 }
2137 info->pending_bh |= BH_RECEIVE;
2138}
2139
2140static void isr_tdma(struct slgt_info *info)
2141{
2142 unsigned int status = rd_reg32(info, TDCSR);
2143
2144 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2145
2146 /* TDCSR (tx DMA control/status)
2147 *
2148 * 31..06 reserved
2149 * 05 error
2150 * 04 eol (end of list)
2151 * 03 eob (end of buffer)
2152 * 02 IRQ enable
2153 * 01 reset
2154 * 00 enable
2155 */
2156 wr_reg32(info, TDCSR, status); /* clear pending */
2157
2158 if (status & (BIT5 + BIT4 + BIT3)) {
2159 // another transmit buffer has completed
2160 // run bottom half to get more send data from user
2161 info->pending_bh |= BH_TRANSMIT;
2162 }
2163}
2164
2165/*
2166 * return true if there are unsent tx DMA buffers, otherwise false
2167 *
2168 * if there are unsent buffers then info->tbuf_start
2169 * is set to index of first unsent buffer
2170 */
2171static bool unsent_tbufs(struct slgt_info *info)
2172{
2173 unsigned int i = info->tbuf_current;
2174 bool rc = false;
2175
2176 /*
2177 * search backwards from last loaded buffer (precedes tbuf_current)
2178 * for first unsent buffer (desc_count > 0)
2179 */
2180
2181 do {
2182 if (i)
2183 i--;
2184 else
2185 i = info->tbuf_count - 1;
2186 if (!desc_count(info->tbufs[i]))
2187 break;
2188 info->tbuf_start = i;
2189 rc = true;
2190 } while (i != info->tbuf_current);
2191
2192 return rc;
2193}
2194
2195static void isr_txeom(struct slgt_info *info, unsigned short status)
2196{
2197 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2198
2199 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2200 tdma_reset(info);
2201 if (status & IRQ_TXUNDER) {
2202 unsigned short val = rd_reg16(info, TCR);
2203 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2204 wr_reg16(info, TCR, val); /* clear reset bit */
2205 }
2206
2207 if (info->tx_active) {
2208 if (info->params.mode != MGSL_MODE_ASYNC) {
2209 if (status & IRQ_TXUNDER)
2210 info->icount.txunder++;
2211 else if (status & IRQ_TXIDLE)
2212 info->icount.txok++;
2213 }
2214
2215 if (unsent_tbufs(info)) {
2216 tx_start(info);
2217 update_tx_timer(info);
2218 return;
2219 }
2220 info->tx_active = false;
2221
2222 del_timer(&info->tx_timer);
2223
2224 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2225 info->signals &= ~SerialSignal_RTS;
2226 info->drop_rts_on_tx_done = false;
2227 set_gtsignals(info);
2228 }
2229
2230#if SYNCLINK_GENERIC_HDLC
2231 if (info->netcount)
2232 hdlcdev_tx_done(info);
2233 else
2234#endif
2235 {
2236 if (info->port.tty && (info->port.tty->flow.stopped || info->port.tty->hw_stopped)) {
2237 tx_stop(info);
2238 return;
2239 }
2240 info->pending_bh |= BH_TRANSMIT;
2241 }
2242 }
2243}
2244
2245static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2246{
2247 struct cond_wait *w, *prev;
2248
2249 /* wake processes waiting for specific transitions */
2250 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2251 if (w->data & changed) {
2252 w->data = state;
2253 wake_up_interruptible(&w->q);
2254 if (prev != NULL)
2255 prev->next = w->next;
2256 else
2257 info->gpio_wait_q = w->next;
2258 } else
2259 prev = w;
2260 }
2261}
2262
2263/* interrupt service routine
2264 *
2265 * irq interrupt number
2266 * dev_id device ID supplied during interrupt registration
2267 */
2268static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2269{
2270 struct slgt_info *info = dev_id;
2271 unsigned int gsr;
2272 unsigned int i;
2273
2274 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2275
2276 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2277 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2278 info->irq_occurred = true;
2279 for(i=0; i < info->port_count ; i++) {
2280 if (info->port_array[i] == NULL)
2281 continue;
2282 spin_lock(&info->port_array[i]->lock);
2283 if (gsr & (BIT8 << i))
2284 isr_serial(info->port_array[i]);
2285 if (gsr & (BIT16 << (i*2)))
2286 isr_rdma(info->port_array[i]);
2287 if (gsr & (BIT17 << (i*2)))
2288 isr_tdma(info->port_array[i]);
2289 spin_unlock(&info->port_array[i]->lock);
2290 }
2291 }
2292
2293 if (info->gpio_present) {
2294 unsigned int state;
2295 unsigned int changed;
2296 spin_lock(&info->lock);
2297 while ((changed = rd_reg32(info, IOSR)) != 0) {
2298 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2299 /* read latched state of GPIO signals */
2300 state = rd_reg32(info, IOVR);
2301 /* clear pending GPIO interrupt bits */
2302 wr_reg32(info, IOSR, changed);
2303 for (i=0 ; i < info->port_count ; i++) {
2304 if (info->port_array[i] != NULL)
2305 isr_gpio(info->port_array[i], changed, state);
2306 }
2307 }
2308 spin_unlock(&info->lock);
2309 }
2310
2311 for(i=0; i < info->port_count ; i++) {
2312 struct slgt_info *port = info->port_array[i];
2313 if (port == NULL)
2314 continue;
2315 spin_lock(&port->lock);
2316 if ((port->port.count || port->netcount) &&
2317 port->pending_bh && !port->bh_running &&
2318 !port->bh_requested) {
2319 DBGISR(("%s bh queued\n", port->device_name));
2320 schedule_work(&port->task);
2321 port->bh_requested = true;
2322 }
2323 spin_unlock(&port->lock);
2324 }
2325
2326 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2327 return IRQ_HANDLED;
2328}
2329
2330static int startup(struct slgt_info *info)
2331{
2332 DBGINFO(("%s startup\n", info->device_name));
2333
2334 if (tty_port_initialized(&info->port))
2335 return 0;
2336
2337 if (!info->tx_buf) {
2338 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2339 if (!info->tx_buf) {
2340 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2341 return -ENOMEM;
2342 }
2343 }
2344
2345 info->pending_bh = 0;
2346
2347 memset(&info->icount, 0, sizeof(info->icount));
2348
2349 /* program hardware for current parameters */
2350 change_params(info);
2351
2352 if (info->port.tty)
2353 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2354
2355 tty_port_set_initialized(&info->port, true);
2356
2357 return 0;
2358}
2359
2360/*
2361 * called by close() and hangup() to shutdown hardware
2362 */
2363static void shutdown(struct slgt_info *info)
2364{
2365 unsigned long flags;
2366
2367 if (!tty_port_initialized(&info->port))
2368 return;
2369
2370 DBGINFO(("%s shutdown\n", info->device_name));
2371
2372 /* clear status wait queue because status changes */
2373 /* can't happen after shutting down the hardware */
2374 wake_up_interruptible(&info->status_event_wait_q);
2375 wake_up_interruptible(&info->event_wait_q);
2376
2377 del_timer_sync(&info->tx_timer);
2378 del_timer_sync(&info->rx_timer);
2379
2380 kfree(info->tx_buf);
2381 info->tx_buf = NULL;
2382
2383 spin_lock_irqsave(&info->lock,flags);
2384
2385 tx_stop(info);
2386 rx_stop(info);
2387
2388 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2389
2390 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2391 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2392 set_gtsignals(info);
2393 }
2394
2395 flush_cond_wait(&info->gpio_wait_q);
2396
2397 spin_unlock_irqrestore(&info->lock,flags);
2398
2399 if (info->port.tty)
2400 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2401
2402 tty_port_set_initialized(&info->port, false);
2403}
2404
2405static void program_hw(struct slgt_info *info)
2406{
2407 unsigned long flags;
2408
2409 spin_lock_irqsave(&info->lock,flags);
2410
2411 rx_stop(info);
2412 tx_stop(info);
2413
2414 if (info->params.mode != MGSL_MODE_ASYNC ||
2415 info->netcount)
2416 sync_mode(info);
2417 else
2418 async_mode(info);
2419
2420 set_gtsignals(info);
2421
2422 info->dcd_chkcount = 0;
2423 info->cts_chkcount = 0;
2424 info->ri_chkcount = 0;
2425 info->dsr_chkcount = 0;
2426
2427 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2428 get_gtsignals(info);
2429
2430 if (info->netcount ||
2431 (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2432 rx_start(info);
2433
2434 spin_unlock_irqrestore(&info->lock,flags);
2435}
2436
2437/*
2438 * reconfigure adapter based on new parameters
2439 */
2440static void change_params(struct slgt_info *info)
2441{
2442 unsigned cflag;
2443 int bits_per_char;
2444
2445 if (!info->port.tty)
2446 return;
2447 DBGINFO(("%s change_params\n", info->device_name));
2448
2449 cflag = info->port.tty->termios.c_cflag;
2450
2451 /* if B0 rate (hangup) specified then negate RTS and DTR */
2452 /* otherwise assert RTS and DTR */
2453 if (cflag & CBAUD)
2454 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2455 else
2456 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2457
2458 /* byte size and parity */
2459
2460 info->params.data_bits = tty_get_char_size(cflag);
2461 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2462
2463 if (cflag & PARENB)
2464 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2465 else
2466 info->params.parity = ASYNC_PARITY_NONE;
2467
2468 /* calculate number of jiffies to transmit a full
2469 * FIFO (32 bytes) at specified data rate
2470 */
2471 bits_per_char = info->params.data_bits +
2472 info->params.stop_bits + 1;
2473
2474 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2475
2476 if (info->params.data_rate) {
2477 info->timeout = (32*HZ*bits_per_char) /
2478 info->params.data_rate;
2479 }
2480 info->timeout += HZ/50; /* Add .02 seconds of slop */
2481
2482 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
2483 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
2484
2485 /* process tty input control flags */
2486
2487 info->read_status_mask = IRQ_RXOVER;
2488 if (I_INPCK(info->port.tty))
2489 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2490 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2491 info->read_status_mask |= MASK_BREAK;
2492 if (I_IGNPAR(info->port.tty))
2493 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2494 if (I_IGNBRK(info->port.tty)) {
2495 info->ignore_status_mask |= MASK_BREAK;
2496 /* If ignoring parity and break indicators, ignore
2497 * overruns too. (For real raw support).
2498 */
2499 if (I_IGNPAR(info->port.tty))
2500 info->ignore_status_mask |= MASK_OVERRUN;
2501 }
2502
2503 program_hw(info);
2504}
2505
2506static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2507{
2508 DBGINFO(("%s get_stats\n", info->device_name));
2509 if (!user_icount) {
2510 memset(&info->icount, 0, sizeof(info->icount));
2511 } else {
2512 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2513 return -EFAULT;
2514 }
2515 return 0;
2516}
2517
2518static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2519{
2520 DBGINFO(("%s get_params\n", info->device_name));
2521 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2522 return -EFAULT;
2523 return 0;
2524}
2525
2526static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2527{
2528 unsigned long flags;
2529 MGSL_PARAMS tmp_params;
2530
2531 DBGINFO(("%s set_params\n", info->device_name));
2532 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2533 return -EFAULT;
2534
2535 spin_lock_irqsave(&info->lock, flags);
2536 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2537 info->base_clock = tmp_params.clock_speed;
2538 else
2539 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2540 spin_unlock_irqrestore(&info->lock, flags);
2541
2542 program_hw(info);
2543
2544 return 0;
2545}
2546
2547static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2548{
2549 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2550 if (put_user(info->idle_mode, idle_mode))
2551 return -EFAULT;
2552 return 0;
2553}
2554
2555static int set_txidle(struct slgt_info *info, int idle_mode)
2556{
2557 unsigned long flags;
2558 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2559 spin_lock_irqsave(&info->lock,flags);
2560 info->idle_mode = idle_mode;
2561 if (info->params.mode != MGSL_MODE_ASYNC)
2562 tx_set_idle(info);
2563 spin_unlock_irqrestore(&info->lock,flags);
2564 return 0;
2565}
2566
2567static int tx_enable(struct slgt_info *info, int enable)
2568{
2569 unsigned long flags;
2570 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2571 spin_lock_irqsave(&info->lock,flags);
2572 if (enable) {
2573 if (!info->tx_enabled)
2574 tx_start(info);
2575 } else {
2576 if (info->tx_enabled)
2577 tx_stop(info);
2578 }
2579 spin_unlock_irqrestore(&info->lock,flags);
2580 return 0;
2581}
2582
2583/*
2584 * abort transmit HDLC frame
2585 */
2586static int tx_abort(struct slgt_info *info)
2587{
2588 unsigned long flags;
2589 DBGINFO(("%s tx_abort\n", info->device_name));
2590 spin_lock_irqsave(&info->lock,flags);
2591 tdma_reset(info);
2592 spin_unlock_irqrestore(&info->lock,flags);
2593 return 0;
2594}
2595
2596static int rx_enable(struct slgt_info *info, int enable)
2597{
2598 unsigned long flags;
2599 unsigned int rbuf_fill_level;
2600 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2601 spin_lock_irqsave(&info->lock,flags);
2602 /*
2603 * enable[31..16] = receive DMA buffer fill level
2604 * 0 = noop (leave fill level unchanged)
2605 * fill level must be multiple of 4 and <= buffer size
2606 */
2607 rbuf_fill_level = ((unsigned int)enable) >> 16;
2608 if (rbuf_fill_level) {
2609 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2610 spin_unlock_irqrestore(&info->lock, flags);
2611 return -EINVAL;
2612 }
2613 info->rbuf_fill_level = rbuf_fill_level;
2614 if (rbuf_fill_level < 128)
2615 info->rx_pio = 1; /* PIO mode */
2616 else
2617 info->rx_pio = 0; /* DMA mode */
2618 rx_stop(info); /* restart receiver to use new fill level */
2619 }
2620
2621 /*
2622 * enable[1..0] = receiver enable command
2623 * 0 = disable
2624 * 1 = enable
2625 * 2 = enable or force hunt mode if already enabled
2626 */
2627 enable &= 3;
2628 if (enable) {
2629 if (!info->rx_enabled)
2630 rx_start(info);
2631 else if (enable == 2) {
2632 /* force hunt mode (write 1 to RCR[3]) */
2633 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2634 }
2635 } else {
2636 if (info->rx_enabled)
2637 rx_stop(info);
2638 }
2639 spin_unlock_irqrestore(&info->lock,flags);
2640 return 0;
2641}
2642
2643/*
2644 * wait for specified event to occur
2645 */
2646static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2647{
2648 unsigned long flags;
2649 int s;
2650 int rc=0;
2651 struct mgsl_icount cprev, cnow;
2652 int events;
2653 int mask;
2654 struct _input_signal_events oldsigs, newsigs;
2655 DECLARE_WAITQUEUE(wait, current);
2656
2657 if (get_user(mask, mask_ptr))
2658 return -EFAULT;
2659
2660 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2661
2662 spin_lock_irqsave(&info->lock,flags);
2663
2664 /* return immediately if state matches requested events */
2665 get_gtsignals(info);
2666 s = info->signals;
2667
2668 events = mask &
2669 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2670 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2671 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2672 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2673 if (events) {
2674 spin_unlock_irqrestore(&info->lock,flags);
2675 goto exit;
2676 }
2677
2678 /* save current irq counts */
2679 cprev = info->icount;
2680 oldsigs = info->input_signal_events;
2681
2682 /* enable hunt and idle irqs if needed */
2683 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2684 unsigned short val = rd_reg16(info, SCR);
2685 if (!(val & IRQ_RXIDLE))
2686 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2687 }
2688
2689 set_current_state(TASK_INTERRUPTIBLE);
2690 add_wait_queue(&info->event_wait_q, &wait);
2691
2692 spin_unlock_irqrestore(&info->lock,flags);
2693
2694 for(;;) {
2695 schedule();
2696 if (signal_pending(current)) {
2697 rc = -ERESTARTSYS;
2698 break;
2699 }
2700
2701 /* get current irq counts */
2702 spin_lock_irqsave(&info->lock,flags);
2703 cnow = info->icount;
2704 newsigs = info->input_signal_events;
2705 set_current_state(TASK_INTERRUPTIBLE);
2706 spin_unlock_irqrestore(&info->lock,flags);
2707
2708 /* if no change, wait aborted for some reason */
2709 if (newsigs.dsr_up == oldsigs.dsr_up &&
2710 newsigs.dsr_down == oldsigs.dsr_down &&
2711 newsigs.dcd_up == oldsigs.dcd_up &&
2712 newsigs.dcd_down == oldsigs.dcd_down &&
2713 newsigs.cts_up == oldsigs.cts_up &&
2714 newsigs.cts_down == oldsigs.cts_down &&
2715 newsigs.ri_up == oldsigs.ri_up &&
2716 newsigs.ri_down == oldsigs.ri_down &&
2717 cnow.exithunt == cprev.exithunt &&
2718 cnow.rxidle == cprev.rxidle) {
2719 rc = -EIO;
2720 break;
2721 }
2722
2723 events = mask &
2724 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2725 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2726 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2727 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2728 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2729 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2730 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2731 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2732 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2733 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2734 if (events)
2735 break;
2736
2737 cprev = cnow;
2738 oldsigs = newsigs;
2739 }
2740
2741 remove_wait_queue(&info->event_wait_q, &wait);
2742 set_current_state(TASK_RUNNING);
2743
2744
2745 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2746 spin_lock_irqsave(&info->lock,flags);
2747 if (!waitqueue_active(&info->event_wait_q)) {
2748 /* disable enable exit hunt mode/idle rcvd IRQs */
2749 wr_reg16(info, SCR,
2750 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2751 }
2752 spin_unlock_irqrestore(&info->lock,flags);
2753 }
2754exit:
2755 if (rc == 0)
2756 rc = put_user(events, mask_ptr);
2757 return rc;
2758}
2759
2760static int get_interface(struct slgt_info *info, int __user *if_mode)
2761{
2762 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2763 if (put_user(info->if_mode, if_mode))
2764 return -EFAULT;
2765 return 0;
2766}
2767
2768static int set_interface(struct slgt_info *info, int if_mode)
2769{
2770 unsigned long flags;
2771 unsigned short val;
2772
2773 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2774 spin_lock_irqsave(&info->lock,flags);
2775 info->if_mode = if_mode;
2776
2777 msc_set_vcr(info);
2778
2779 /* TCR (tx control) 07 1=RTS driver control */
2780 val = rd_reg16(info, TCR);
2781 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2782 val |= BIT7;
2783 else
2784 val &= ~BIT7;
2785 wr_reg16(info, TCR, val);
2786
2787 spin_unlock_irqrestore(&info->lock,flags);
2788 return 0;
2789}
2790
2791static int get_xsync(struct slgt_info *info, int __user *xsync)
2792{
2793 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2794 if (put_user(info->xsync, xsync))
2795 return -EFAULT;
2796 return 0;
2797}
2798
2799/*
2800 * set extended sync pattern (1 to 4 bytes) for extended sync mode
2801 *
2802 * sync pattern is contained in least significant bytes of value
2803 * most significant byte of sync pattern is oldest (1st sent/detected)
2804 */
2805static int set_xsync(struct slgt_info *info, int xsync)
2806{
2807 unsigned long flags;
2808
2809 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2810 spin_lock_irqsave(&info->lock, flags);
2811 info->xsync = xsync;
2812 wr_reg32(info, XSR, xsync);
2813 spin_unlock_irqrestore(&info->lock, flags);
2814 return 0;
2815}
2816
2817static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2818{
2819 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2820 if (put_user(info->xctrl, xctrl))
2821 return -EFAULT;
2822 return 0;
2823}
2824
2825/*
2826 * set extended control options
2827 *
2828 * xctrl[31:19] reserved, must be zero
2829 * xctrl[18:17] extended sync pattern length in bytes
2830 * 00 = 1 byte in xsr[7:0]
2831 * 01 = 2 bytes in xsr[15:0]
2832 * 10 = 3 bytes in xsr[23:0]
2833 * 11 = 4 bytes in xsr[31:0]
2834 * xctrl[16] 1 = enable terminal count, 0=disabled
2835 * xctrl[15:0] receive terminal count for fixed length packets
2836 * value is count minus one (0 = 1 byte packet)
2837 * when terminal count is reached, receiver
2838 * automatically returns to hunt mode and receive
2839 * FIFO contents are flushed to DMA buffers with
2840 * end of frame (EOF) status
2841 */
2842static int set_xctrl(struct slgt_info *info, int xctrl)
2843{
2844 unsigned long flags;
2845
2846 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2847 spin_lock_irqsave(&info->lock, flags);
2848 info->xctrl = xctrl;
2849 wr_reg32(info, XCR, xctrl);
2850 spin_unlock_irqrestore(&info->lock, flags);
2851 return 0;
2852}
2853
2854/*
2855 * set general purpose IO pin state and direction
2856 *
2857 * user_gpio fields:
2858 * state each bit indicates a pin state
2859 * smask set bit indicates pin state to set
2860 * dir each bit indicates a pin direction (0=input, 1=output)
2861 * dmask set bit indicates pin direction to set
2862 */
2863static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2864{
2865 unsigned long flags;
2866 struct gpio_desc gpio;
2867 __u32 data;
2868
2869 if (!info->gpio_present)
2870 return -EINVAL;
2871 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2872 return -EFAULT;
2873 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2874 info->device_name, gpio.state, gpio.smask,
2875 gpio.dir, gpio.dmask));
2876
2877 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2878 if (gpio.dmask) {
2879 data = rd_reg32(info, IODR);
2880 data |= gpio.dmask & gpio.dir;
2881 data &= ~(gpio.dmask & ~gpio.dir);
2882 wr_reg32(info, IODR, data);
2883 }
2884 if (gpio.smask) {
2885 data = rd_reg32(info, IOVR);
2886 data |= gpio.smask & gpio.state;
2887 data &= ~(gpio.smask & ~gpio.state);
2888 wr_reg32(info, IOVR, data);
2889 }
2890 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
2891
2892 return 0;
2893}
2894
2895/*
2896 * get general purpose IO pin state and direction
2897 */
2898static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2899{
2900 struct gpio_desc gpio;
2901 if (!info->gpio_present)
2902 return -EINVAL;
2903 gpio.state = rd_reg32(info, IOVR);
2904 gpio.smask = 0xffffffff;
2905 gpio.dir = rd_reg32(info, IODR);
2906 gpio.dmask = 0xffffffff;
2907 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2908 return -EFAULT;
2909 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2910 info->device_name, gpio.state, gpio.dir));
2911 return 0;
2912}
2913
2914/*
2915 * conditional wait facility
2916 */
2917static void init_cond_wait(struct cond_wait *w, unsigned int data)
2918{
2919 init_waitqueue_head(&w->q);
2920 init_waitqueue_entry(&w->wait, current);
2921 w->data = data;
2922}
2923
2924static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2925{
2926 set_current_state(TASK_INTERRUPTIBLE);
2927 add_wait_queue(&w->q, &w->wait);
2928 w->next = *head;
2929 *head = w;
2930}
2931
2932static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2933{
2934 struct cond_wait *w, *prev;
2935 remove_wait_queue(&cw->q, &cw->wait);
2936 set_current_state(TASK_RUNNING);
2937 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2938 if (w == cw) {
2939 if (prev != NULL)
2940 prev->next = w->next;
2941 else
2942 *head = w->next;
2943 break;
2944 }
2945 }
2946}
2947
2948static void flush_cond_wait(struct cond_wait **head)
2949{
2950 while (*head != NULL) {
2951 wake_up_interruptible(&(*head)->q);
2952 *head = (*head)->next;
2953 }
2954}
2955
2956/*
2957 * wait for general purpose I/O pin(s) to enter specified state
2958 *
2959 * user_gpio fields:
2960 * state - bit indicates target pin state
2961 * smask - set bit indicates watched pin
2962 *
2963 * The wait ends when at least one watched pin enters the specified
2964 * state. When 0 (no error) is returned, user_gpio->state is set to the
2965 * state of all GPIO pins when the wait ends.
2966 *
2967 * Note: Each pin may be a dedicated input, dedicated output, or
2968 * configurable input/output. The number and configuration of pins
2969 * varies with the specific adapter model. Only input pins (dedicated
2970 * or configured) can be monitored with this function.
2971 */
2972static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2973{
2974 unsigned long flags;
2975 int rc = 0;
2976 struct gpio_desc gpio;
2977 struct cond_wait wait;
2978 u32 state;
2979
2980 if (!info->gpio_present)
2981 return -EINVAL;
2982 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2983 return -EFAULT;
2984 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2985 info->device_name, gpio.state, gpio.smask));
2986 /* ignore output pins identified by set IODR bit */
2987 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2988 return -EINVAL;
2989 init_cond_wait(&wait, gpio.smask);
2990
2991 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2992 /* enable interrupts for watched pins */
2993 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
2994 /* get current pin states */
2995 state = rd_reg32(info, IOVR);
2996
2997 if (gpio.smask & ~(state ^ gpio.state)) {
2998 /* already in target state */
2999 gpio.state = state;
3000 } else {
3001 /* wait for target state */
3002 add_cond_wait(&info->gpio_wait_q, &wait);
3003 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3004 schedule();
3005 if (signal_pending(current))
3006 rc = -ERESTARTSYS;
3007 else
3008 gpio.state = wait.data;
3009 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3010 remove_cond_wait(&info->gpio_wait_q, &wait);
3011 }
3012
3013 /* disable all GPIO interrupts if no waiting processes */
3014 if (info->gpio_wait_q == NULL)
3015 wr_reg32(info, IOER, 0);
3016 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3017
3018 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3019 rc = -EFAULT;
3020 return rc;
3021}
3022
3023static int modem_input_wait(struct slgt_info *info,int arg)
3024{
3025 unsigned long flags;
3026 int rc;
3027 struct mgsl_icount cprev, cnow;
3028 DECLARE_WAITQUEUE(wait, current);
3029
3030 /* save current irq counts */
3031 spin_lock_irqsave(&info->lock,flags);
3032 cprev = info->icount;
3033 add_wait_queue(&info->status_event_wait_q, &wait);
3034 set_current_state(TASK_INTERRUPTIBLE);
3035 spin_unlock_irqrestore(&info->lock,flags);
3036
3037 for(;;) {
3038 schedule();
3039 if (signal_pending(current)) {
3040 rc = -ERESTARTSYS;
3041 break;
3042 }
3043
3044 /* get new irq counts */
3045 spin_lock_irqsave(&info->lock,flags);
3046 cnow = info->icount;
3047 set_current_state(TASK_INTERRUPTIBLE);
3048 spin_unlock_irqrestore(&info->lock,flags);
3049
3050 /* if no change, wait aborted for some reason */
3051 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3052 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3053 rc = -EIO;
3054 break;
3055 }
3056
3057 /* check for change in caller specified modem input */
3058 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3059 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3060 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3061 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3062 rc = 0;
3063 break;
3064 }
3065
3066 cprev = cnow;
3067 }
3068 remove_wait_queue(&info->status_event_wait_q, &wait);
3069 set_current_state(TASK_RUNNING);
3070 return rc;
3071}
3072
3073/*
3074 * return state of serial control and status signals
3075 */
3076static int tiocmget(struct tty_struct *tty)
3077{
3078 struct slgt_info *info = tty->driver_data;
3079 unsigned int result;
3080 unsigned long flags;
3081
3082 spin_lock_irqsave(&info->lock,flags);
3083 get_gtsignals(info);
3084 spin_unlock_irqrestore(&info->lock,flags);
3085
3086 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3087 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3088 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3089 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3090 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3091 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3092
3093 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3094 return result;
3095}
3096
3097/*
3098 * set modem control signals (DTR/RTS)
3099 *
3100 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3101 * TIOCMSET = set/clear signal values
3102 * value bit mask for command
3103 */
3104static int tiocmset(struct tty_struct *tty,
3105 unsigned int set, unsigned int clear)
3106{
3107 struct slgt_info *info = tty->driver_data;
3108 unsigned long flags;
3109
3110 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3111
3112 if (set & TIOCM_RTS)
3113 info->signals |= SerialSignal_RTS;
3114 if (set & TIOCM_DTR)
3115 info->signals |= SerialSignal_DTR;
3116 if (clear & TIOCM_RTS)
3117 info->signals &= ~SerialSignal_RTS;
3118 if (clear & TIOCM_DTR)
3119 info->signals &= ~SerialSignal_DTR;
3120
3121 spin_lock_irqsave(&info->lock,flags);
3122 set_gtsignals(info);
3123 spin_unlock_irqrestore(&info->lock,flags);
3124 return 0;
3125}
3126
3127static bool carrier_raised(struct tty_port *port)
3128{
3129 unsigned long flags;
3130 struct slgt_info *info = container_of(port, struct slgt_info, port);
3131
3132 spin_lock_irqsave(&info->lock,flags);
3133 get_gtsignals(info);
3134 spin_unlock_irqrestore(&info->lock,flags);
3135
3136 return info->signals & SerialSignal_DCD;
3137}
3138
3139static void dtr_rts(struct tty_port *port, bool active)
3140{
3141 unsigned long flags;
3142 struct slgt_info *info = container_of(port, struct slgt_info, port);
3143
3144 spin_lock_irqsave(&info->lock,flags);
3145 if (active)
3146 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3147 else
3148 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3149 set_gtsignals(info);
3150 spin_unlock_irqrestore(&info->lock,flags);
3151}
3152
3153
3154/*
3155 * block current process until the device is ready to open
3156 */
3157static int block_til_ready(struct tty_struct *tty, struct file *filp,
3158 struct slgt_info *info)
3159{
3160 DECLARE_WAITQUEUE(wait, current);
3161 int retval;
3162 bool do_clocal = false;
3163 unsigned long flags;
3164 bool cd;
3165 struct tty_port *port = &info->port;
3166
3167 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3168
3169 if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3170 /* nonblock mode is set or port is not enabled */
3171 tty_port_set_active(port, true);
3172 return 0;
3173 }
3174
3175 if (C_CLOCAL(tty))
3176 do_clocal = true;
3177
3178 /* Wait for carrier detect and the line to become
3179 * free (i.e., not in use by the callout). While we are in
3180 * this loop, port->count is dropped by one, so that
3181 * close() knows when to free things. We restore it upon
3182 * exit, either normal or abnormal.
3183 */
3184
3185 retval = 0;
3186 add_wait_queue(&port->open_wait, &wait);
3187
3188 spin_lock_irqsave(&info->lock, flags);
3189 port->count--;
3190 spin_unlock_irqrestore(&info->lock, flags);
3191 port->blocked_open++;
3192
3193 while (1) {
3194 if (C_BAUD(tty) && tty_port_initialized(port))
3195 tty_port_raise_dtr_rts(port);
3196
3197 set_current_state(TASK_INTERRUPTIBLE);
3198
3199 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3200 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3201 -EAGAIN : -ERESTARTSYS;
3202 break;
3203 }
3204
3205 cd = tty_port_carrier_raised(port);
3206 if (do_clocal || cd)
3207 break;
3208
3209 if (signal_pending(current)) {
3210 retval = -ERESTARTSYS;
3211 break;
3212 }
3213
3214 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3215 tty_unlock(tty);
3216 schedule();
3217 tty_lock(tty);
3218 }
3219
3220 set_current_state(TASK_RUNNING);
3221 remove_wait_queue(&port->open_wait, &wait);
3222
3223 if (!tty_hung_up_p(filp))
3224 port->count++;
3225 port->blocked_open--;
3226
3227 if (!retval)
3228 tty_port_set_active(port, true);
3229
3230 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3231 return retval;
3232}
3233
3234/*
3235 * allocate buffers used for calling line discipline receive_buf
3236 * directly in synchronous mode
3237 * note: add 5 bytes to max frame size to allow appending
3238 * 32-bit CRC and status byte when configured to do so
3239 */
3240static int alloc_tmp_rbuf(struct slgt_info *info)
3241{
3242 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3243 if (info->tmp_rbuf == NULL)
3244 return -ENOMEM;
3245
3246 return 0;
3247}
3248
3249static void free_tmp_rbuf(struct slgt_info *info)
3250{
3251 kfree(info->tmp_rbuf);
3252 info->tmp_rbuf = NULL;
3253}
3254
3255/*
3256 * allocate DMA descriptor lists.
3257 */
3258static int alloc_desc(struct slgt_info *info)
3259{
3260 unsigned int i;
3261 unsigned int pbufs;
3262
3263 /* allocate memory to hold descriptor lists */
3264 info->bufs = dma_alloc_coherent(&info->pdev->dev, DESC_LIST_SIZE,
3265 &info->bufs_dma_addr, GFP_KERNEL);
3266 if (info->bufs == NULL)
3267 return -ENOMEM;
3268
3269 info->rbufs = (struct slgt_desc*)info->bufs;
3270 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3271
3272 pbufs = (unsigned int)info->bufs_dma_addr;
3273
3274 /*
3275 * Build circular lists of descriptors
3276 */
3277
3278 for (i=0; i < info->rbuf_count; i++) {
3279 /* physical address of this descriptor */
3280 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3281
3282 /* physical address of next descriptor */
3283 if (i == info->rbuf_count - 1)
3284 info->rbufs[i].next = cpu_to_le32(pbufs);
3285 else
3286 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3287 set_desc_count(info->rbufs[i], DMABUFSIZE);
3288 }
3289
3290 for (i=0; i < info->tbuf_count; i++) {
3291 /* physical address of this descriptor */
3292 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3293
3294 /* physical address of next descriptor */
3295 if (i == info->tbuf_count - 1)
3296 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3297 else
3298 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3299 }
3300
3301 return 0;
3302}
3303
3304static void free_desc(struct slgt_info *info)
3305{
3306 if (info->bufs != NULL) {
3307 dma_free_coherent(&info->pdev->dev, DESC_LIST_SIZE,
3308 info->bufs, info->bufs_dma_addr);
3309 info->bufs = NULL;
3310 info->rbufs = NULL;
3311 info->tbufs = NULL;
3312 }
3313}
3314
3315static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3316{
3317 int i;
3318 for (i=0; i < count; i++) {
3319 bufs[i].buf = dma_alloc_coherent(&info->pdev->dev, DMABUFSIZE,
3320 &bufs[i].buf_dma_addr, GFP_KERNEL);
3321 if (!bufs[i].buf)
3322 return -ENOMEM;
3323 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3324 }
3325 return 0;
3326}
3327
3328static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3329{
3330 int i;
3331 for (i=0; i < count; i++) {
3332 if (bufs[i].buf == NULL)
3333 continue;
3334 dma_free_coherent(&info->pdev->dev, DMABUFSIZE, bufs[i].buf,
3335 bufs[i].buf_dma_addr);
3336 bufs[i].buf = NULL;
3337 }
3338}
3339
3340static int alloc_dma_bufs(struct slgt_info *info)
3341{
3342 info->rbuf_count = 32;
3343 info->tbuf_count = 32;
3344
3345 if (alloc_desc(info) < 0 ||
3346 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3347 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3348 alloc_tmp_rbuf(info) < 0) {
3349 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3350 return -ENOMEM;
3351 }
3352 reset_rbufs(info);
3353 return 0;
3354}
3355
3356static void free_dma_bufs(struct slgt_info *info)
3357{
3358 if (info->bufs) {
3359 free_bufs(info, info->rbufs, info->rbuf_count);
3360 free_bufs(info, info->tbufs, info->tbuf_count);
3361 free_desc(info);
3362 }
3363 free_tmp_rbuf(info);
3364}
3365
3366static int claim_resources(struct slgt_info *info)
3367{
3368 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3369 DBGERR(("%s reg addr conflict, addr=%08X\n",
3370 info->device_name, info->phys_reg_addr));
3371 info->init_error = DiagStatus_AddressConflict;
3372 goto errout;
3373 }
3374 else
3375 info->reg_addr_requested = true;
3376
3377 info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE);
3378 if (!info->reg_addr) {
3379 DBGERR(("%s can't map device registers, addr=%08X\n",
3380 info->device_name, info->phys_reg_addr));
3381 info->init_error = DiagStatus_CantAssignPciResources;
3382 goto errout;
3383 }
3384 return 0;
3385
3386errout:
3387 release_resources(info);
3388 return -ENODEV;
3389}
3390
3391static void release_resources(struct slgt_info *info)
3392{
3393 if (info->irq_requested) {
3394 free_irq(info->irq_level, info);
3395 info->irq_requested = false;
3396 }
3397
3398 if (info->reg_addr_requested) {
3399 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3400 info->reg_addr_requested = false;
3401 }
3402
3403 if (info->reg_addr) {
3404 iounmap(info->reg_addr);
3405 info->reg_addr = NULL;
3406 }
3407}
3408
3409/* Add the specified device instance data structure to the
3410 * global linked list of devices and increment the device count.
3411 */
3412static void add_device(struct slgt_info *info)
3413{
3414 char *devstr;
3415
3416 info->next_device = NULL;
3417 info->line = slgt_device_count;
3418 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3419
3420 if (info->line < MAX_DEVICES) {
3421 if (maxframe[info->line])
3422 info->max_frame_size = maxframe[info->line];
3423 }
3424
3425 slgt_device_count++;
3426
3427 if (!slgt_device_list)
3428 slgt_device_list = info;
3429 else {
3430 struct slgt_info *current_dev = slgt_device_list;
3431 while(current_dev->next_device)
3432 current_dev = current_dev->next_device;
3433 current_dev->next_device = info;
3434 }
3435
3436 if (info->max_frame_size < 4096)
3437 info->max_frame_size = 4096;
3438 else if (info->max_frame_size > 65535)
3439 info->max_frame_size = 65535;
3440
3441 switch(info->pdev->device) {
3442 case SYNCLINK_GT_DEVICE_ID:
3443 devstr = "GT";
3444 break;
3445 case SYNCLINK_GT2_DEVICE_ID:
3446 devstr = "GT2";
3447 break;
3448 case SYNCLINK_GT4_DEVICE_ID:
3449 devstr = "GT4";
3450 break;
3451 case SYNCLINK_AC_DEVICE_ID:
3452 devstr = "AC";
3453 info->params.mode = MGSL_MODE_ASYNC;
3454 break;
3455 default:
3456 devstr = "(unknown model)";
3457 }
3458 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3459 devstr, info->device_name, info->phys_reg_addr,
3460 info->irq_level, info->max_frame_size);
3461
3462#if SYNCLINK_GENERIC_HDLC
3463 hdlcdev_init(info);
3464#endif
3465}
3466
3467static const struct tty_port_operations slgt_port_ops = {
3468 .carrier_raised = carrier_raised,
3469 .dtr_rts = dtr_rts,
3470};
3471
3472/*
3473 * allocate device instance structure, return NULL on failure
3474 */
3475static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3476{
3477 struct slgt_info *info;
3478
3479 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3480
3481 if (!info) {
3482 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3483 driver_name, adapter_num, port_num));
3484 } else {
3485 tty_port_init(&info->port);
3486 info->port.ops = &slgt_port_ops;
3487 INIT_WORK(&info->task, bh_handler);
3488 info->max_frame_size = 4096;
3489 info->base_clock = 14745600;
3490 info->rbuf_fill_level = DMABUFSIZE;
3491 init_waitqueue_head(&info->status_event_wait_q);
3492 init_waitqueue_head(&info->event_wait_q);
3493 spin_lock_init(&info->netlock);
3494 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3495 info->idle_mode = HDLC_TXIDLE_FLAGS;
3496 info->adapter_num = adapter_num;
3497 info->port_num = port_num;
3498
3499 timer_setup(&info->tx_timer, tx_timeout, 0);
3500 timer_setup(&info->rx_timer, rx_timeout, 0);
3501
3502 /* Copy configuration info to device instance data */
3503 info->pdev = pdev;
3504 info->irq_level = pdev->irq;
3505 info->phys_reg_addr = pci_resource_start(pdev,0);
3506
3507 info->bus_type = MGSL_BUS_TYPE_PCI;
3508 info->irq_flags = IRQF_SHARED;
3509
3510 info->init_error = -1; /* assume error, set to 0 on successful init */
3511 }
3512
3513 return info;
3514}
3515
3516static void device_init(int adapter_num, struct pci_dev *pdev)
3517{
3518 struct slgt_info *port_array[SLGT_MAX_PORTS];
3519 int i;
3520 int port_count = 1;
3521
3522 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3523 port_count = 2;
3524 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3525 port_count = 4;
3526
3527 /* allocate device instances for all ports */
3528 for (i=0; i < port_count; ++i) {
3529 port_array[i] = alloc_dev(adapter_num, i, pdev);
3530 if (port_array[i] == NULL) {
3531 for (--i; i >= 0; --i) {
3532 tty_port_destroy(&port_array[i]->port);
3533 kfree(port_array[i]);
3534 }
3535 return;
3536 }
3537 }
3538
3539 /* give copy of port_array to all ports and add to device list */
3540 for (i=0; i < port_count; ++i) {
3541 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3542 add_device(port_array[i]);
3543 port_array[i]->port_count = port_count;
3544 spin_lock_init(&port_array[i]->lock);
3545 }
3546
3547 /* Allocate and claim adapter resources */
3548 if (!claim_resources(port_array[0])) {
3549
3550 alloc_dma_bufs(port_array[0]);
3551
3552 /* copy resource information from first port to others */
3553 for (i = 1; i < port_count; ++i) {
3554 port_array[i]->irq_level = port_array[0]->irq_level;
3555 port_array[i]->reg_addr = port_array[0]->reg_addr;
3556 alloc_dma_bufs(port_array[i]);
3557 }
3558
3559 if (request_irq(port_array[0]->irq_level,
3560 slgt_interrupt,
3561 port_array[0]->irq_flags,
3562 port_array[0]->device_name,
3563 port_array[0]) < 0) {
3564 DBGERR(("%s request_irq failed IRQ=%d\n",
3565 port_array[0]->device_name,
3566 port_array[0]->irq_level));
3567 } else {
3568 port_array[0]->irq_requested = true;
3569 adapter_test(port_array[0]);
3570 for (i=1 ; i < port_count ; i++) {
3571 port_array[i]->init_error = port_array[0]->init_error;
3572 port_array[i]->gpio_present = port_array[0]->gpio_present;
3573 }
3574 }
3575 }
3576
3577 for (i = 0; i < port_count; ++i) {
3578 struct slgt_info *info = port_array[i];
3579 tty_port_register_device(&info->port, serial_driver, info->line,
3580 &info->pdev->dev);
3581 }
3582}
3583
3584static int init_one(struct pci_dev *dev,
3585 const struct pci_device_id *ent)
3586{
3587 if (pci_enable_device(dev)) {
3588 printk("error enabling pci device %p\n", dev);
3589 return -EIO;
3590 }
3591 pci_set_master(dev);
3592 device_init(slgt_device_count, dev);
3593 return 0;
3594}
3595
3596static void remove_one(struct pci_dev *dev)
3597{
3598}
3599
3600static const struct tty_operations ops = {
3601 .open = open,
3602 .close = close,
3603 .write = write,
3604 .put_char = put_char,
3605 .flush_chars = flush_chars,
3606 .write_room = write_room,
3607 .chars_in_buffer = chars_in_buffer,
3608 .flush_buffer = flush_buffer,
3609 .ioctl = ioctl,
3610 .compat_ioctl = slgt_compat_ioctl,
3611 .throttle = throttle,
3612 .unthrottle = unthrottle,
3613 .send_xchar = send_xchar,
3614 .break_ctl = set_break,
3615 .wait_until_sent = wait_until_sent,
3616 .set_termios = set_termios,
3617 .stop = tx_hold,
3618 .start = tx_release,
3619 .hangup = hangup,
3620 .tiocmget = tiocmget,
3621 .tiocmset = tiocmset,
3622 .get_icount = get_icount,
3623 .proc_show = synclink_gt_proc_show,
3624};
3625
3626static void slgt_cleanup(void)
3627{
3628 struct slgt_info *info;
3629 struct slgt_info *tmp;
3630
3631 if (serial_driver) {
3632 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3633 tty_unregister_device(serial_driver, info->line);
3634 tty_unregister_driver(serial_driver);
3635 tty_driver_kref_put(serial_driver);
3636 }
3637
3638 /* reset devices */
3639 info = slgt_device_list;
3640 while(info) {
3641 reset_port(info);
3642 info = info->next_device;
3643 }
3644
3645 /* release devices */
3646 info = slgt_device_list;
3647 while(info) {
3648#if SYNCLINK_GENERIC_HDLC
3649 hdlcdev_exit(info);
3650#endif
3651 free_dma_bufs(info);
3652 free_tmp_rbuf(info);
3653 if (info->port_num == 0)
3654 release_resources(info);
3655 tmp = info;
3656 info = info->next_device;
3657 tty_port_destroy(&tmp->port);
3658 kfree(tmp);
3659 }
3660
3661 if (pci_registered)
3662 pci_unregister_driver(&pci_driver);
3663}
3664
3665/*
3666 * Driver initialization entry point.
3667 */
3668static int __init slgt_init(void)
3669{
3670 int rc;
3671
3672 serial_driver = tty_alloc_driver(MAX_DEVICES, TTY_DRIVER_REAL_RAW |
3673 TTY_DRIVER_DYNAMIC_DEV);
3674 if (IS_ERR(serial_driver)) {
3675 printk("%s can't allocate tty driver\n", driver_name);
3676 return PTR_ERR(serial_driver);
3677 }
3678
3679 /* Initialize the tty_driver structure */
3680
3681 serial_driver->driver_name = "synclink_gt";
3682 serial_driver->name = tty_dev_prefix;
3683 serial_driver->major = ttymajor;
3684 serial_driver->minor_start = 64;
3685 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3686 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3687 serial_driver->init_termios = tty_std_termios;
3688 serial_driver->init_termios.c_cflag =
3689 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3690 serial_driver->init_termios.c_ispeed = 9600;
3691 serial_driver->init_termios.c_ospeed = 9600;
3692 tty_set_operations(serial_driver, &ops);
3693 if ((rc = tty_register_driver(serial_driver)) < 0) {
3694 DBGERR(("%s can't register serial driver\n", driver_name));
3695 tty_driver_kref_put(serial_driver);
3696 serial_driver = NULL;
3697 goto error;
3698 }
3699
3700 slgt_device_count = 0;
3701 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3702 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3703 goto error;
3704 }
3705 pci_registered = true;
3706
3707 return 0;
3708
3709error:
3710 slgt_cleanup();
3711 return rc;
3712}
3713
3714static void __exit slgt_exit(void)
3715{
3716 slgt_cleanup();
3717}
3718
3719module_init(slgt_init);
3720module_exit(slgt_exit);
3721
3722/*
3723 * register access routines
3724 */
3725
3726static inline void __iomem *calc_regaddr(struct slgt_info *info,
3727 unsigned int addr)
3728{
3729 void __iomem *reg_addr = info->reg_addr + addr;
3730
3731 if (addr >= 0x80)
3732 reg_addr += info->port_num * 32;
3733 else if (addr >= 0x40)
3734 reg_addr += info->port_num * 16;
3735
3736 return reg_addr;
3737}
3738
3739static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3740{
3741 return readb(calc_regaddr(info, addr));
3742}
3743
3744static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3745{
3746 writeb(value, calc_regaddr(info, addr));
3747}
3748
3749static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3750{
3751 return readw(calc_regaddr(info, addr));
3752}
3753
3754static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3755{
3756 writew(value, calc_regaddr(info, addr));
3757}
3758
3759static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3760{
3761 return readl(calc_regaddr(info, addr));
3762}
3763
3764static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3765{
3766 writel(value, calc_regaddr(info, addr));
3767}
3768
3769static void rdma_reset(struct slgt_info *info)
3770{
3771 unsigned int i;
3772
3773 /* set reset bit */
3774 wr_reg32(info, RDCSR, BIT1);
3775
3776 /* wait for enable bit cleared */
3777 for(i=0 ; i < 1000 ; i++)
3778 if (!(rd_reg32(info, RDCSR) & BIT0))
3779 break;
3780}
3781
3782static void tdma_reset(struct slgt_info *info)
3783{
3784 unsigned int i;
3785
3786 /* set reset bit */
3787 wr_reg32(info, TDCSR, BIT1);
3788
3789 /* wait for enable bit cleared */
3790 for(i=0 ; i < 1000 ; i++)
3791 if (!(rd_reg32(info, TDCSR) & BIT0))
3792 break;
3793}
3794
3795/*
3796 * enable internal loopback
3797 * TxCLK and RxCLK are generated from BRG
3798 * and TxD is looped back to RxD internally.
3799 */
3800static void enable_loopback(struct slgt_info *info)
3801{
3802 /* SCR (serial control) BIT2=loopback enable */
3803 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3804
3805 if (info->params.mode != MGSL_MODE_ASYNC) {
3806 /* CCR (clock control)
3807 * 07..05 tx clock source (010 = BRG)
3808 * 04..02 rx clock source (010 = BRG)
3809 * 01 auxclk enable (0 = disable)
3810 * 00 BRG enable (1 = enable)
3811 *
3812 * 0100 1001
3813 */
3814 wr_reg8(info, CCR, 0x49);
3815
3816 /* set speed if available, otherwise use default */
3817 if (info->params.clock_speed)
3818 set_rate(info, info->params.clock_speed);
3819 else
3820 set_rate(info, 3686400);
3821 }
3822}
3823
3824/*
3825 * set baud rate generator to specified rate
3826 */
3827static void set_rate(struct slgt_info *info, u32 rate)
3828{
3829 unsigned int div;
3830 unsigned int osc = info->base_clock;
3831
3832 /* div = osc/rate - 1
3833 *
3834 * Round div up if osc/rate is not integer to
3835 * force to next slowest rate.
3836 */
3837
3838 if (rate) {
3839 div = osc/rate;
3840 if (!(osc % rate) && div)
3841 div--;
3842 wr_reg16(info, BDR, (unsigned short)div);
3843 }
3844}
3845
3846static void rx_stop(struct slgt_info *info)
3847{
3848 unsigned short val;
3849
3850 /* disable and reset receiver */
3851 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3852 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3853 wr_reg16(info, RCR, val); /* clear reset bit */
3854
3855 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3856
3857 /* clear pending rx interrupts */
3858 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3859
3860 rdma_reset(info);
3861
3862 info->rx_enabled = false;
3863 info->rx_restart = false;
3864}
3865
3866static void rx_start(struct slgt_info *info)
3867{
3868 unsigned short val;
3869
3870 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3871
3872 /* clear pending rx overrun IRQ */
3873 wr_reg16(info, SSR, IRQ_RXOVER);
3874
3875 /* reset and disable receiver */
3876 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3877 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3878 wr_reg16(info, RCR, val); /* clear reset bit */
3879
3880 rdma_reset(info);
3881 reset_rbufs(info);
3882
3883 if (info->rx_pio) {
3884 /* rx request when rx FIFO not empty */
3885 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
3886 slgt_irq_on(info, IRQ_RXDATA);
3887 if (info->params.mode == MGSL_MODE_ASYNC) {
3888 /* enable saving of rx status */
3889 wr_reg32(info, RDCSR, BIT6);
3890 }
3891 } else {
3892 /* rx request when rx FIFO half full */
3893 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
3894 /* set 1st descriptor address */
3895 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3896
3897 if (info->params.mode != MGSL_MODE_ASYNC) {
3898 /* enable rx DMA and DMA interrupt */
3899 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3900 } else {
3901 /* enable saving of rx status, rx DMA and DMA interrupt */
3902 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3903 }
3904 }
3905
3906 slgt_irq_on(info, IRQ_RXOVER);
3907
3908 /* enable receiver */
3909 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3910
3911 info->rx_restart = false;
3912 info->rx_enabled = true;
3913}
3914
3915static void tx_start(struct slgt_info *info)
3916{
3917 if (!info->tx_enabled) {
3918 wr_reg16(info, TCR,
3919 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3920 info->tx_enabled = true;
3921 }
3922
3923 if (desc_count(info->tbufs[info->tbuf_start])) {
3924 info->drop_rts_on_tx_done = false;
3925
3926 if (info->params.mode != MGSL_MODE_ASYNC) {
3927 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3928 get_gtsignals(info);
3929 if (!(info->signals & SerialSignal_RTS)) {
3930 info->signals |= SerialSignal_RTS;
3931 set_gtsignals(info);
3932 info->drop_rts_on_tx_done = true;
3933 }
3934 }
3935
3936 slgt_irq_off(info, IRQ_TXDATA);
3937 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3938 /* clear tx idle and underrun status bits */
3939 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3940 } else {
3941 slgt_irq_off(info, IRQ_TXDATA);
3942 slgt_irq_on(info, IRQ_TXIDLE);
3943 /* clear tx idle status bit */
3944 wr_reg16(info, SSR, IRQ_TXIDLE);
3945 }
3946 /* set 1st descriptor address and start DMA */
3947 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3948 wr_reg32(info, TDCSR, BIT2 + BIT0);
3949 info->tx_active = true;
3950 }
3951}
3952
3953static void tx_stop(struct slgt_info *info)
3954{
3955 unsigned short val;
3956
3957 del_timer(&info->tx_timer);
3958
3959 tdma_reset(info);
3960
3961 /* reset and disable transmitter */
3962 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
3963 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3964
3965 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3966
3967 /* clear tx idle and underrun status bit */
3968 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3969
3970 reset_tbufs(info);
3971
3972 info->tx_enabled = false;
3973 info->tx_active = false;
3974}
3975
3976static void reset_port(struct slgt_info *info)
3977{
3978 if (!info->reg_addr)
3979 return;
3980
3981 tx_stop(info);
3982 rx_stop(info);
3983
3984 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3985 set_gtsignals(info);
3986
3987 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
3988}
3989
3990static void reset_adapter(struct slgt_info *info)
3991{
3992 int i;
3993 for (i=0; i < info->port_count; ++i) {
3994 if (info->port_array[i])
3995 reset_port(info->port_array[i]);
3996 }
3997}
3998
3999static void async_mode(struct slgt_info *info)
4000{
4001 unsigned short val;
4002
4003 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4004 tx_stop(info);
4005 rx_stop(info);
4006
4007 /* TCR (tx control)
4008 *
4009 * 15..13 mode, 010=async
4010 * 12..10 encoding, 000=NRZ
4011 * 09 parity enable
4012 * 08 1=odd parity, 0=even parity
4013 * 07 1=RTS driver control
4014 * 06 1=break enable
4015 * 05..04 character length
4016 * 00=5 bits
4017 * 01=6 bits
4018 * 10=7 bits
4019 * 11=8 bits
4020 * 03 0=1 stop bit, 1=2 stop bits
4021 * 02 reset
4022 * 01 enable
4023 * 00 auto-CTS enable
4024 */
4025 val = 0x4000;
4026
4027 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4028 val |= BIT7;
4029
4030 if (info->params.parity != ASYNC_PARITY_NONE) {
4031 val |= BIT9;
4032 if (info->params.parity == ASYNC_PARITY_ODD)
4033 val |= BIT8;
4034 }
4035
4036 switch (info->params.data_bits)
4037 {
4038 case 6: val |= BIT4; break;
4039 case 7: val |= BIT5; break;
4040 case 8: val |= BIT5 + BIT4; break;
4041 }
4042
4043 if (info->params.stop_bits != 1)
4044 val |= BIT3;
4045
4046 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4047 val |= BIT0;
4048
4049 wr_reg16(info, TCR, val);
4050
4051 /* RCR (rx control)
4052 *
4053 * 15..13 mode, 010=async
4054 * 12..10 encoding, 000=NRZ
4055 * 09 parity enable
4056 * 08 1=odd parity, 0=even parity
4057 * 07..06 reserved, must be 0
4058 * 05..04 character length
4059 * 00=5 bits
4060 * 01=6 bits
4061 * 10=7 bits
4062 * 11=8 bits
4063 * 03 reserved, must be zero
4064 * 02 reset
4065 * 01 enable
4066 * 00 auto-DCD enable
4067 */
4068 val = 0x4000;
4069
4070 if (info->params.parity != ASYNC_PARITY_NONE) {
4071 val |= BIT9;
4072 if (info->params.parity == ASYNC_PARITY_ODD)
4073 val |= BIT8;
4074 }
4075
4076 switch (info->params.data_bits)
4077 {
4078 case 6: val |= BIT4; break;
4079 case 7: val |= BIT5; break;
4080 case 8: val |= BIT5 + BIT4; break;
4081 }
4082
4083 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4084 val |= BIT0;
4085
4086 wr_reg16(info, RCR, val);
4087
4088 /* CCR (clock control)
4089 *
4090 * 07..05 011 = tx clock source is BRG/16
4091 * 04..02 010 = rx clock source is BRG
4092 * 01 0 = auxclk disabled
4093 * 00 1 = BRG enabled
4094 *
4095 * 0110 1001
4096 */
4097 wr_reg8(info, CCR, 0x69);
4098
4099 msc_set_vcr(info);
4100
4101 /* SCR (serial control)
4102 *
4103 * 15 1=tx req on FIFO half empty
4104 * 14 1=rx req on FIFO half full
4105 * 13 tx data IRQ enable
4106 * 12 tx idle IRQ enable
4107 * 11 rx break on IRQ enable
4108 * 10 rx data IRQ enable
4109 * 09 rx break off IRQ enable
4110 * 08 overrun IRQ enable
4111 * 07 DSR IRQ enable
4112 * 06 CTS IRQ enable
4113 * 05 DCD IRQ enable
4114 * 04 RI IRQ enable
4115 * 03 0=16x sampling, 1=8x sampling
4116 * 02 1=txd->rxd internal loopback enable
4117 * 01 reserved, must be zero
4118 * 00 1=master IRQ enable
4119 */
4120 val = BIT15 + BIT14 + BIT0;
4121 /* JCR[8] : 1 = x8 async mode feature available */
4122 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4123 ((info->base_clock < (info->params.data_rate * 16)) ||
4124 (info->base_clock % (info->params.data_rate * 16)))) {
4125 /* use 8x sampling */
4126 val |= BIT3;
4127 set_rate(info, info->params.data_rate * 8);
4128 } else {
4129 /* use 16x sampling */
4130 set_rate(info, info->params.data_rate * 16);
4131 }
4132 wr_reg16(info, SCR, val);
4133
4134 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4135
4136 if (info->params.loopback)
4137 enable_loopback(info);
4138}
4139
4140static void sync_mode(struct slgt_info *info)
4141{
4142 unsigned short val;
4143
4144 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4145 tx_stop(info);
4146 rx_stop(info);
4147
4148 /* TCR (tx control)
4149 *
4150 * 15..13 mode
4151 * 000=HDLC/SDLC
4152 * 001=raw bit synchronous
4153 * 010=asynchronous/isochronous
4154 * 011=monosync byte synchronous
4155 * 100=bisync byte synchronous
4156 * 101=xsync byte synchronous
4157 * 12..10 encoding
4158 * 09 CRC enable
4159 * 08 CRC32
4160 * 07 1=RTS driver control
4161 * 06 preamble enable
4162 * 05..04 preamble length
4163 * 03 share open/close flag
4164 * 02 reset
4165 * 01 enable
4166 * 00 auto-CTS enable
4167 */
4168 val = BIT2;
4169
4170 switch(info->params.mode) {
4171 case MGSL_MODE_XSYNC:
4172 val |= BIT15 + BIT13;
4173 break;
4174 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4175 case MGSL_MODE_BISYNC: val |= BIT15; break;
4176 case MGSL_MODE_RAW: val |= BIT13; break;
4177 }
4178 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4179 val |= BIT7;
4180
4181 switch(info->params.encoding)
4182 {
4183 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4184 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4185 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4186 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4187 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4188 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4189 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4190 }
4191
4192 switch (info->params.crc_type & HDLC_CRC_MASK)
4193 {
4194 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4195 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4196 }
4197
4198 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4199 val |= BIT6;
4200
4201 switch (info->params.preamble_length)
4202 {
4203 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4204 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4205 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4206 }
4207
4208 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4209 val |= BIT0;
4210
4211 wr_reg16(info, TCR, val);
4212
4213 /* TPR (transmit preamble) */
4214
4215 switch (info->params.preamble)
4216 {
4217 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4218 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4219 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4220 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4221 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4222 default: val = 0x7e; break;
4223 }
4224 wr_reg8(info, TPR, (unsigned char)val);
4225
4226 /* RCR (rx control)
4227 *
4228 * 15..13 mode
4229 * 000=HDLC/SDLC
4230 * 001=raw bit synchronous
4231 * 010=asynchronous/isochronous
4232 * 011=monosync byte synchronous
4233 * 100=bisync byte synchronous
4234 * 101=xsync byte synchronous
4235 * 12..10 encoding
4236 * 09 CRC enable
4237 * 08 CRC32
4238 * 07..03 reserved, must be 0
4239 * 02 reset
4240 * 01 enable
4241 * 00 auto-DCD enable
4242 */
4243 val = 0;
4244
4245 switch(info->params.mode) {
4246 case MGSL_MODE_XSYNC:
4247 val |= BIT15 + BIT13;
4248 break;
4249 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4250 case MGSL_MODE_BISYNC: val |= BIT15; break;
4251 case MGSL_MODE_RAW: val |= BIT13; break;
4252 }
4253
4254 switch(info->params.encoding)
4255 {
4256 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4257 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4258 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4259 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4260 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4261 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4262 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4263 }
4264
4265 switch (info->params.crc_type & HDLC_CRC_MASK)
4266 {
4267 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4268 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4269 }
4270
4271 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4272 val |= BIT0;
4273
4274 wr_reg16(info, RCR, val);
4275
4276 /* CCR (clock control)
4277 *
4278 * 07..05 tx clock source
4279 * 04..02 rx clock source
4280 * 01 auxclk enable
4281 * 00 BRG enable
4282 */
4283 val = 0;
4284
4285 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4286 {
4287 // when RxC source is DPLL, BRG generates 16X DPLL
4288 // reference clock, so take TxC from BRG/16 to get
4289 // transmit clock at actual data rate
4290 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4291 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4292 else
4293 val |= BIT6; /* 010, txclk = BRG */
4294 }
4295 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4296 val |= BIT7; /* 100, txclk = DPLL Input */
4297 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4298 val |= BIT5; /* 001, txclk = RXC Input */
4299
4300 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4301 val |= BIT3; /* 010, rxclk = BRG */
4302 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4303 val |= BIT4; /* 100, rxclk = DPLL */
4304 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4305 val |= BIT2; /* 001, rxclk = TXC Input */
4306
4307 if (info->params.clock_speed)
4308 val |= BIT1 + BIT0;
4309
4310 wr_reg8(info, CCR, (unsigned char)val);
4311
4312 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4313 {
4314 // program DPLL mode
4315 switch(info->params.encoding)
4316 {
4317 case HDLC_ENCODING_BIPHASE_MARK:
4318 case HDLC_ENCODING_BIPHASE_SPACE:
4319 val = BIT7; break;
4320 case HDLC_ENCODING_BIPHASE_LEVEL:
4321 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4322 val = BIT7 + BIT6; break;
4323 default: val = BIT6; // NRZ encodings
4324 }
4325 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4326
4327 // DPLL requires a 16X reference clock from BRG
4328 set_rate(info, info->params.clock_speed * 16);
4329 }
4330 else
4331 set_rate(info, info->params.clock_speed);
4332
4333 tx_set_idle(info);
4334
4335 msc_set_vcr(info);
4336
4337 /* SCR (serial control)
4338 *
4339 * 15 1=tx req on FIFO half empty
4340 * 14 1=rx req on FIFO half full
4341 * 13 tx data IRQ enable
4342 * 12 tx idle IRQ enable
4343 * 11 underrun IRQ enable
4344 * 10 rx data IRQ enable
4345 * 09 rx idle IRQ enable
4346 * 08 overrun IRQ enable
4347 * 07 DSR IRQ enable
4348 * 06 CTS IRQ enable
4349 * 05 DCD IRQ enable
4350 * 04 RI IRQ enable
4351 * 03 reserved, must be zero
4352 * 02 1=txd->rxd internal loopback enable
4353 * 01 reserved, must be zero
4354 * 00 1=master IRQ enable
4355 */
4356 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4357
4358 if (info->params.loopback)
4359 enable_loopback(info);
4360}
4361
4362/*
4363 * set transmit idle mode
4364 */
4365static void tx_set_idle(struct slgt_info *info)
4366{
4367 unsigned char val;
4368 unsigned short tcr;
4369
4370 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4371 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4372 */
4373 tcr = rd_reg16(info, TCR);
4374 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4375 /* disable preamble, set idle size to 16 bits */
4376 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4377 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4378 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4379 } else if (!(tcr & BIT6)) {
4380 /* preamble is disabled, set idle size to 8 bits */
4381 tcr &= ~(BIT5 + BIT4);
4382 }
4383 wr_reg16(info, TCR, tcr);
4384
4385 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4386 /* LSB of custom tx idle specified in tx idle register */
4387 val = (unsigned char)(info->idle_mode & 0xff);
4388 } else {
4389 /* standard 8 bit idle patterns */
4390 switch(info->idle_mode)
4391 {
4392 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4393 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4394 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4395 case HDLC_TXIDLE_ZEROS:
4396 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4397 default: val = 0xff;
4398 }
4399 }
4400
4401 wr_reg8(info, TIR, val);
4402}
4403
4404/*
4405 * get state of V24 status (input) signals
4406 */
4407static void get_gtsignals(struct slgt_info *info)
4408{
4409 unsigned short status = rd_reg16(info, SSR);
4410
4411 /* clear all serial signals except RTS and DTR */
4412 info->signals &= SerialSignal_RTS | SerialSignal_DTR;
4413
4414 if (status & BIT3)
4415 info->signals |= SerialSignal_DSR;
4416 if (status & BIT2)
4417 info->signals |= SerialSignal_CTS;
4418 if (status & BIT1)
4419 info->signals |= SerialSignal_DCD;
4420 if (status & BIT0)
4421 info->signals |= SerialSignal_RI;
4422}
4423
4424/*
4425 * set V.24 Control Register based on current configuration
4426 */
4427static void msc_set_vcr(struct slgt_info *info)
4428{
4429 unsigned char val = 0;
4430
4431 /* VCR (V.24 control)
4432 *
4433 * 07..04 serial IF select
4434 * 03 DTR
4435 * 02 RTS
4436 * 01 LL
4437 * 00 RL
4438 */
4439
4440 switch(info->if_mode & MGSL_INTERFACE_MASK)
4441 {
4442 case MGSL_INTERFACE_RS232:
4443 val |= BIT5; /* 0010 */
4444 break;
4445 case MGSL_INTERFACE_V35:
4446 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4447 break;
4448 case MGSL_INTERFACE_RS422:
4449 val |= BIT6; /* 0100 */
4450 break;
4451 }
4452
4453 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4454 val |= BIT4;
4455 if (info->signals & SerialSignal_DTR)
4456 val |= BIT3;
4457 if (info->signals & SerialSignal_RTS)
4458 val |= BIT2;
4459 if (info->if_mode & MGSL_INTERFACE_LL)
4460 val |= BIT1;
4461 if (info->if_mode & MGSL_INTERFACE_RL)
4462 val |= BIT0;
4463 wr_reg8(info, VCR, val);
4464}
4465
4466/*
4467 * set state of V24 control (output) signals
4468 */
4469static void set_gtsignals(struct slgt_info *info)
4470{
4471 unsigned char val = rd_reg8(info, VCR);
4472 if (info->signals & SerialSignal_DTR)
4473 val |= BIT3;
4474 else
4475 val &= ~BIT3;
4476 if (info->signals & SerialSignal_RTS)
4477 val |= BIT2;
4478 else
4479 val &= ~BIT2;
4480 wr_reg8(info, VCR, val);
4481}
4482
4483/*
4484 * free range of receive DMA buffers (i to last)
4485 */
4486static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4487{
4488 int done = 0;
4489
4490 while(!done) {
4491 /* reset current buffer for reuse */
4492 info->rbufs[i].status = 0;
4493 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4494 if (i == last)
4495 done = 1;
4496 if (++i == info->rbuf_count)
4497 i = 0;
4498 }
4499 info->rbuf_current = i;
4500}
4501
4502/*
4503 * mark all receive DMA buffers as free
4504 */
4505static void reset_rbufs(struct slgt_info *info)
4506{
4507 free_rbufs(info, 0, info->rbuf_count - 1);
4508 info->rbuf_fill_index = 0;
4509 info->rbuf_fill_count = 0;
4510}
4511
4512/*
4513 * pass receive HDLC frame to upper layer
4514 *
4515 * return true if frame available, otherwise false
4516 */
4517static bool rx_get_frame(struct slgt_info *info)
4518{
4519 unsigned int start, end;
4520 unsigned short status;
4521 unsigned int framesize = 0;
4522 unsigned long flags;
4523 struct tty_struct *tty = info->port.tty;
4524 unsigned char addr_field = 0xff;
4525 unsigned int crc_size = 0;
4526
4527 switch (info->params.crc_type & HDLC_CRC_MASK) {
4528 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4529 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4530 }
4531
4532check_again:
4533
4534 framesize = 0;
4535 addr_field = 0xff;
4536 start = end = info->rbuf_current;
4537
4538 for (;;) {
4539 if (!desc_complete(info->rbufs[end]))
4540 goto cleanup;
4541
4542 if (framesize == 0 && info->params.addr_filter != 0xff)
4543 addr_field = info->rbufs[end].buf[0];
4544
4545 framesize += desc_count(info->rbufs[end]);
4546
4547 if (desc_eof(info->rbufs[end]))
4548 break;
4549
4550 if (++end == info->rbuf_count)
4551 end = 0;
4552
4553 if (end == info->rbuf_current) {
4554 if (info->rx_enabled){
4555 spin_lock_irqsave(&info->lock,flags);
4556 rx_start(info);
4557 spin_unlock_irqrestore(&info->lock,flags);
4558 }
4559 goto cleanup;
4560 }
4561 }
4562
4563 /* status
4564 *
4565 * 15 buffer complete
4566 * 14..06 reserved
4567 * 05..04 residue
4568 * 02 eof (end of frame)
4569 * 01 CRC error
4570 * 00 abort
4571 */
4572 status = desc_status(info->rbufs[end]);
4573
4574 /* ignore CRC bit if not using CRC (bit is undefined) */
4575 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4576 status &= ~BIT1;
4577
4578 if (framesize == 0 ||
4579 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4580 free_rbufs(info, start, end);
4581 goto check_again;
4582 }
4583
4584 if (framesize < (2 + crc_size) || status & BIT0) {
4585 info->icount.rxshort++;
4586 framesize = 0;
4587 } else if (status & BIT1) {
4588 info->icount.rxcrc++;
4589 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4590 framesize = 0;
4591 }
4592
4593#if SYNCLINK_GENERIC_HDLC
4594 if (framesize == 0) {
4595 info->netdev->stats.rx_errors++;
4596 info->netdev->stats.rx_frame_errors++;
4597 }
4598#endif
4599
4600 DBGBH(("%s rx frame status=%04X size=%d\n",
4601 info->device_name, status, framesize));
4602 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4603
4604 if (framesize) {
4605 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4606 framesize -= crc_size;
4607 crc_size = 0;
4608 }
4609
4610 if (framesize > info->max_frame_size + crc_size)
4611 info->icount.rxlong++;
4612 else {
4613 /* copy dma buffer(s) to contiguous temp buffer */
4614 int copy_count = framesize;
4615 int i = start;
4616 unsigned char *p = info->tmp_rbuf;
4617 info->tmp_rbuf_count = framesize;
4618
4619 info->icount.rxok++;
4620
4621 while(copy_count) {
4622 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4623 memcpy(p, info->rbufs[i].buf, partial_count);
4624 p += partial_count;
4625 copy_count -= partial_count;
4626 if (++i == info->rbuf_count)
4627 i = 0;
4628 }
4629
4630 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4631 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4632 framesize++;
4633 }
4634
4635#if SYNCLINK_GENERIC_HDLC
4636 if (info->netcount)
4637 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4638 else
4639#endif
4640 ldisc_receive_buf(tty, info->tmp_rbuf, NULL,
4641 framesize);
4642 }
4643 }
4644 free_rbufs(info, start, end);
4645 return true;
4646
4647cleanup:
4648 return false;
4649}
4650
4651/*
4652 * pass receive buffer (RAW synchronous mode) to tty layer
4653 * return true if buffer available, otherwise false
4654 */
4655static bool rx_get_buf(struct slgt_info *info)
4656{
4657 unsigned int i = info->rbuf_current;
4658 unsigned int count;
4659
4660 if (!desc_complete(info->rbufs[i]))
4661 return false;
4662 count = desc_count(info->rbufs[i]);
4663 switch(info->params.mode) {
4664 case MGSL_MODE_MONOSYNC:
4665 case MGSL_MODE_BISYNC:
4666 case MGSL_MODE_XSYNC:
4667 /* ignore residue in byte synchronous modes */
4668 if (desc_residue(info->rbufs[i]))
4669 count--;
4670 break;
4671 }
4672 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4673 DBGINFO(("rx_get_buf size=%d\n", count));
4674 if (count)
4675 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf, NULL,
4676 count);
4677 free_rbufs(info, i, i);
4678 return true;
4679}
4680
4681static void reset_tbufs(struct slgt_info *info)
4682{
4683 unsigned int i;
4684 info->tbuf_current = 0;
4685 for (i=0 ; i < info->tbuf_count ; i++) {
4686 info->tbufs[i].status = 0;
4687 info->tbufs[i].count = 0;
4688 }
4689}
4690
4691/*
4692 * return number of free transmit DMA buffers
4693 */
4694static unsigned int free_tbuf_count(struct slgt_info *info)
4695{
4696 unsigned int count = 0;
4697 unsigned int i = info->tbuf_current;
4698
4699 do
4700 {
4701 if (desc_count(info->tbufs[i]))
4702 break; /* buffer in use */
4703 ++count;
4704 if (++i == info->tbuf_count)
4705 i=0;
4706 } while (i != info->tbuf_current);
4707
4708 /* if tx DMA active, last zero count buffer is in use */
4709 if (count && (rd_reg32(info, TDCSR) & BIT0))
4710 --count;
4711
4712 return count;
4713}
4714
4715/*
4716 * return number of bytes in unsent transmit DMA buffers
4717 * and the serial controller tx FIFO
4718 */
4719static unsigned int tbuf_bytes(struct slgt_info *info)
4720{
4721 unsigned int total_count = 0;
4722 unsigned int i = info->tbuf_current;
4723 unsigned int reg_value;
4724 unsigned int count;
4725 unsigned int active_buf_count = 0;
4726
4727 /*
4728 * Add descriptor counts for all tx DMA buffers.
4729 * If count is zero (cleared by DMA controller after read),
4730 * the buffer is complete or is actively being read from.
4731 *
4732 * Record buf_count of last buffer with zero count starting
4733 * from current ring position. buf_count is mirror
4734 * copy of count and is not cleared by serial controller.
4735 * If DMA controller is active, that buffer is actively
4736 * being read so add to total.
4737 */
4738 do {
4739 count = desc_count(info->tbufs[i]);
4740 if (count)
4741 total_count += count;
4742 else if (!total_count)
4743 active_buf_count = info->tbufs[i].buf_count;
4744 if (++i == info->tbuf_count)
4745 i = 0;
4746 } while (i != info->tbuf_current);
4747
4748 /* read tx DMA status register */
4749 reg_value = rd_reg32(info, TDCSR);
4750
4751 /* if tx DMA active, last zero count buffer is in use */
4752 if (reg_value & BIT0)
4753 total_count += active_buf_count;
4754
4755 /* add tx FIFO count = reg_value[15..8] */
4756 total_count += (reg_value >> 8) & 0xff;
4757
4758 /* if transmitter active add one byte for shift register */
4759 if (info->tx_active)
4760 total_count++;
4761
4762 return total_count;
4763}
4764
4765/*
4766 * load data into transmit DMA buffer ring and start transmitter if needed
4767 * return true if data accepted, otherwise false (buffers full)
4768 */
4769static bool tx_load(struct slgt_info *info, const u8 *buf, unsigned int size)
4770{
4771 unsigned short count;
4772 unsigned int i;
4773 struct slgt_desc *d;
4774
4775 /* check required buffer space */
4776 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4777 return false;
4778
4779 DBGDATA(info, buf, size, "tx");
4780
4781 /*
4782 * copy data to one or more DMA buffers in circular ring
4783 * tbuf_start = first buffer for this data
4784 * tbuf_current = next free buffer
4785 *
4786 * Copy all data before making data visible to DMA controller by
4787 * setting descriptor count of the first buffer.
4788 * This prevents an active DMA controller from reading the first DMA
4789 * buffers of a frame and stopping before the final buffers are filled.
4790 */
4791
4792 info->tbuf_start = i = info->tbuf_current;
4793
4794 while (size) {
4795 d = &info->tbufs[i];
4796
4797 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4798 memcpy(d->buf, buf, count);
4799
4800 size -= count;
4801 buf += count;
4802
4803 /*
4804 * set EOF bit for last buffer of HDLC frame or
4805 * for every buffer in raw mode
4806 */
4807 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4808 info->params.mode == MGSL_MODE_RAW)
4809 set_desc_eof(*d, 1);
4810 else
4811 set_desc_eof(*d, 0);
4812
4813 /* set descriptor count for all but first buffer */
4814 if (i != info->tbuf_start)
4815 set_desc_count(*d, count);
4816 d->buf_count = count;
4817
4818 if (++i == info->tbuf_count)
4819 i = 0;
4820 }
4821
4822 info->tbuf_current = i;
4823
4824 /* set first buffer count to make new data visible to DMA controller */
4825 d = &info->tbufs[info->tbuf_start];
4826 set_desc_count(*d, d->buf_count);
4827
4828 /* start transmitter if needed and update transmit timeout */
4829 if (!info->tx_active)
4830 tx_start(info);
4831 update_tx_timer(info);
4832
4833 return true;
4834}
4835
4836static int register_test(struct slgt_info *info)
4837{
4838 static unsigned short patterns[] =
4839 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4840 static unsigned int count = ARRAY_SIZE(patterns);
4841 unsigned int i;
4842 int rc = 0;
4843
4844 for (i=0 ; i < count ; i++) {
4845 wr_reg16(info, TIR, patterns[i]);
4846 wr_reg16(info, BDR, patterns[(i+1)%count]);
4847 if ((rd_reg16(info, TIR) != patterns[i]) ||
4848 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4849 rc = -ENODEV;
4850 break;
4851 }
4852 }
4853 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4854 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4855 return rc;
4856}
4857
4858static int irq_test(struct slgt_info *info)
4859{
4860 unsigned long timeout;
4861 unsigned long flags;
4862 struct tty_struct *oldtty = info->port.tty;
4863 u32 speed = info->params.data_rate;
4864
4865 info->params.data_rate = 921600;
4866 info->port.tty = NULL;
4867
4868 spin_lock_irqsave(&info->lock, flags);
4869 async_mode(info);
4870 slgt_irq_on(info, IRQ_TXIDLE);
4871
4872 /* enable transmitter */
4873 wr_reg16(info, TCR,
4874 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4875
4876 /* write one byte and wait for tx idle */
4877 wr_reg16(info, TDR, 0);
4878
4879 /* assume failure */
4880 info->init_error = DiagStatus_IrqFailure;
4881 info->irq_occurred = false;
4882
4883 spin_unlock_irqrestore(&info->lock, flags);
4884
4885 timeout=100;
4886 while(timeout-- && !info->irq_occurred)
4887 msleep_interruptible(10);
4888
4889 spin_lock_irqsave(&info->lock,flags);
4890 reset_port(info);
4891 spin_unlock_irqrestore(&info->lock,flags);
4892
4893 info->params.data_rate = speed;
4894 info->port.tty = oldtty;
4895
4896 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4897 return info->irq_occurred ? 0 : -ENODEV;
4898}
4899
4900static int loopback_test_rx(struct slgt_info *info)
4901{
4902 unsigned char *src, *dest;
4903 int count;
4904
4905 if (desc_complete(info->rbufs[0])) {
4906 count = desc_count(info->rbufs[0]);
4907 src = info->rbufs[0].buf;
4908 dest = info->tmp_rbuf;
4909
4910 for( ; count ; count-=2, src+=2) {
4911 /* src=data byte (src+1)=status byte */
4912 if (!(*(src+1) & (BIT9 + BIT8))) {
4913 *dest = *src;
4914 dest++;
4915 info->tmp_rbuf_count++;
4916 }
4917 }
4918 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4919 return 1;
4920 }
4921 return 0;
4922}
4923
4924static int loopback_test(struct slgt_info *info)
4925{
4926#define TESTFRAMESIZE 20
4927
4928 unsigned long timeout;
4929 u16 count;
4930 unsigned char buf[TESTFRAMESIZE];
4931 int rc = -ENODEV;
4932 unsigned long flags;
4933
4934 struct tty_struct *oldtty = info->port.tty;
4935 MGSL_PARAMS params;
4936
4937 memcpy(¶ms, &info->params, sizeof(params));
4938
4939 info->params.mode = MGSL_MODE_ASYNC;
4940 info->params.data_rate = 921600;
4941 info->params.loopback = 1;
4942 info->port.tty = NULL;
4943
4944 /* build and send transmit frame */
4945 for (count = 0; count < TESTFRAMESIZE; ++count)
4946 buf[count] = (unsigned char)count;
4947
4948 info->tmp_rbuf_count = 0;
4949 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4950
4951 /* program hardware for HDLC and enabled receiver */
4952 spin_lock_irqsave(&info->lock,flags);
4953 async_mode(info);
4954 rx_start(info);
4955 tx_load(info, buf, count);
4956 spin_unlock_irqrestore(&info->lock, flags);
4957
4958 /* wait for receive complete */
4959 for (timeout = 100; timeout; --timeout) {
4960 msleep_interruptible(10);
4961 if (loopback_test_rx(info)) {
4962 rc = 0;
4963 break;
4964 }
4965 }
4966
4967 /* verify received frame length and contents */
4968 if (!rc && (info->tmp_rbuf_count != count ||
4969 memcmp(buf, info->tmp_rbuf, count))) {
4970 rc = -ENODEV;
4971 }
4972
4973 spin_lock_irqsave(&info->lock,flags);
4974 reset_adapter(info);
4975 spin_unlock_irqrestore(&info->lock,flags);
4976
4977 memcpy(&info->params, ¶ms, sizeof(info->params));
4978 info->port.tty = oldtty;
4979
4980 info->init_error = rc ? DiagStatus_DmaFailure : 0;
4981 return rc;
4982}
4983
4984static int adapter_test(struct slgt_info *info)
4985{
4986 DBGINFO(("testing %s\n", info->device_name));
4987 if (register_test(info) < 0) {
4988 printk("register test failure %s addr=%08X\n",
4989 info->device_name, info->phys_reg_addr);
4990 } else if (irq_test(info) < 0) {
4991 printk("IRQ test failure %s IRQ=%d\n",
4992 info->device_name, info->irq_level);
4993 } else if (loopback_test(info) < 0) {
4994 printk("loopback test failure %s\n", info->device_name);
4995 }
4996 return info->init_error;
4997}
4998
4999/*
5000 * transmit timeout handler
5001 */
5002static void tx_timeout(struct timer_list *t)
5003{
5004 struct slgt_info *info = from_timer(info, t, tx_timer);
5005 unsigned long flags;
5006
5007 DBGINFO(("%s tx_timeout\n", info->device_name));
5008 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5009 info->icount.txtimeout++;
5010 }
5011 spin_lock_irqsave(&info->lock,flags);
5012 tx_stop(info);
5013 spin_unlock_irqrestore(&info->lock,flags);
5014
5015#if SYNCLINK_GENERIC_HDLC
5016 if (info->netcount)
5017 hdlcdev_tx_done(info);
5018 else
5019#endif
5020 bh_transmit(info);
5021}
5022
5023/*
5024 * receive buffer polling timer
5025 */
5026static void rx_timeout(struct timer_list *t)
5027{
5028 struct slgt_info *info = from_timer(info, t, rx_timer);
5029 unsigned long flags;
5030
5031 DBGINFO(("%s rx_timeout\n", info->device_name));
5032 spin_lock_irqsave(&info->lock, flags);
5033 info->pending_bh |= BH_RECEIVE;
5034 spin_unlock_irqrestore(&info->lock, flags);
5035 bh_handler(&info->task);
5036}
5037
1// SPDX-License-Identifier: GPL-1.0+
2/*
3 * Device driver for Microgate SyncLink GT serial adapters.
4 *
5 * written by Paul Fulghum for Microgate Corporation
6 * paulkf@microgate.com
7 *
8 * Microgate and SyncLink are trademarks of Microgate Corporation
9 *
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
12 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
13 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
14 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
15 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
16 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
17 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
18 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
19 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
20 * OF THE POSSIBILITY OF SUCH DAMAGE.
21 */
22
23/*
24 * DEBUG OUTPUT DEFINITIONS
25 *
26 * uncomment lines below to enable specific types of debug output
27 *
28 * DBGINFO information - most verbose output
29 * DBGERR serious errors
30 * DBGBH bottom half service routine debugging
31 * DBGISR interrupt service routine debugging
32 * DBGDATA output receive and transmit data
33 * DBGTBUF output transmit DMA buffers and registers
34 * DBGRBUF output receive DMA buffers and registers
35 */
36
37#define DBGINFO(fmt) if (debug_level >= DEBUG_LEVEL_INFO) printk fmt
38#define DBGERR(fmt) if (debug_level >= DEBUG_LEVEL_ERROR) printk fmt
39#define DBGBH(fmt) if (debug_level >= DEBUG_LEVEL_BH) printk fmt
40#define DBGISR(fmt) if (debug_level >= DEBUG_LEVEL_ISR) printk fmt
41#define DBGDATA(info, buf, size, label) if (debug_level >= DEBUG_LEVEL_DATA) trace_block((info), (buf), (size), (label))
42/*#define DBGTBUF(info) dump_tbufs(info)*/
43/*#define DBGRBUF(info) dump_rbufs(info)*/
44
45
46#include <linux/module.h>
47#include <linux/errno.h>
48#include <linux/signal.h>
49#include <linux/sched.h>
50#include <linux/timer.h>
51#include <linux/interrupt.h>
52#include <linux/pci.h>
53#include <linux/tty.h>
54#include <linux/tty_flip.h>
55#include <linux/serial.h>
56#include <linux/major.h>
57#include <linux/string.h>
58#include <linux/fcntl.h>
59#include <linux/ptrace.h>
60#include <linux/ioport.h>
61#include <linux/mm.h>
62#include <linux/seq_file.h>
63#include <linux/slab.h>
64#include <linux/netdevice.h>
65#include <linux/vmalloc.h>
66#include <linux/init.h>
67#include <linux/delay.h>
68#include <linux/ioctl.h>
69#include <linux/termios.h>
70#include <linux/bitops.h>
71#include <linux/workqueue.h>
72#include <linux/hdlc.h>
73#include <linux/synclink.h>
74
75#include <asm/io.h>
76#include <asm/irq.h>
77#include <asm/dma.h>
78#include <asm/types.h>
79#include <linux/uaccess.h>
80
81#if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINK_GT_MODULE))
82#define SYNCLINK_GENERIC_HDLC 1
83#else
84#define SYNCLINK_GENERIC_HDLC 0
85#endif
86
87/*
88 * module identification
89 */
90static char *driver_name = "SyncLink GT";
91static char *slgt_driver_name = "synclink_gt";
92static char *tty_dev_prefix = "ttySLG";
93MODULE_LICENSE("GPL");
94#define MGSL_MAGIC 0x5401
95#define MAX_DEVICES 32
96
97static const struct pci_device_id pci_table[] = {
98 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
99 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT2_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
100 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_GT4_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
101 {PCI_VENDOR_ID_MICROGATE, SYNCLINK_AC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
102 {0,}, /* terminate list */
103};
104MODULE_DEVICE_TABLE(pci, pci_table);
105
106static int init_one(struct pci_dev *dev,const struct pci_device_id *ent);
107static void remove_one(struct pci_dev *dev);
108static struct pci_driver pci_driver = {
109 .name = "synclink_gt",
110 .id_table = pci_table,
111 .probe = init_one,
112 .remove = remove_one,
113};
114
115static bool pci_registered;
116
117/*
118 * module configuration and status
119 */
120static struct slgt_info *slgt_device_list;
121static int slgt_device_count;
122
123static int ttymajor;
124static int debug_level;
125static int maxframe[MAX_DEVICES];
126
127module_param(ttymajor, int, 0);
128module_param(debug_level, int, 0);
129module_param_array(maxframe, int, NULL, 0);
130
131MODULE_PARM_DESC(ttymajor, "TTY major device number override: 0=auto assigned");
132MODULE_PARM_DESC(debug_level, "Debug syslog output: 0=disabled, 1 to 5=increasing detail");
133MODULE_PARM_DESC(maxframe, "Maximum frame size used by device (4096 to 65535)");
134
135/*
136 * tty support and callbacks
137 */
138static struct tty_driver *serial_driver;
139
140static void wait_until_sent(struct tty_struct *tty, int timeout);
141static void flush_buffer(struct tty_struct *tty);
142static void tx_release(struct tty_struct *tty);
143
144/*
145 * generic HDLC support
146 */
147#define dev_to_port(D) (dev_to_hdlc(D)->priv)
148
149
150/*
151 * device specific structures, macros and functions
152 */
153
154#define SLGT_MAX_PORTS 4
155#define SLGT_REG_SIZE 256
156
157/*
158 * conditional wait facility
159 */
160struct cond_wait {
161 struct cond_wait *next;
162 wait_queue_head_t q;
163 wait_queue_entry_t wait;
164 unsigned int data;
165};
166static void flush_cond_wait(struct cond_wait **head);
167
168/*
169 * DMA buffer descriptor and access macros
170 */
171struct slgt_desc
172{
173 __le16 count;
174 __le16 status;
175 __le32 pbuf; /* physical address of data buffer */
176 __le32 next; /* physical address of next descriptor */
177
178 /* driver book keeping */
179 char *buf; /* virtual address of data buffer */
180 unsigned int pdesc; /* physical address of this descriptor */
181 dma_addr_t buf_dma_addr;
182 unsigned short buf_count;
183};
184
185#define set_desc_buffer(a,b) (a).pbuf = cpu_to_le32((unsigned int)(b))
186#define set_desc_next(a,b) (a).next = cpu_to_le32((unsigned int)(b))
187#define set_desc_count(a,b)(a).count = cpu_to_le16((unsigned short)(b))
188#define set_desc_eof(a,b) (a).status = cpu_to_le16((b) ? (le16_to_cpu((a).status) | BIT0) : (le16_to_cpu((a).status) & ~BIT0))
189#define set_desc_status(a, b) (a).status = cpu_to_le16((unsigned short)(b))
190#define desc_count(a) (le16_to_cpu((a).count))
191#define desc_status(a) (le16_to_cpu((a).status))
192#define desc_complete(a) (le16_to_cpu((a).status) & BIT15)
193#define desc_eof(a) (le16_to_cpu((a).status) & BIT2)
194#define desc_crc_error(a) (le16_to_cpu((a).status) & BIT1)
195#define desc_abort(a) (le16_to_cpu((a).status) & BIT0)
196#define desc_residue(a) ((le16_to_cpu((a).status) & 0x38) >> 3)
197
198struct _input_signal_events {
199 int ri_up;
200 int ri_down;
201 int dsr_up;
202 int dsr_down;
203 int dcd_up;
204 int dcd_down;
205 int cts_up;
206 int cts_down;
207};
208
209/*
210 * device instance data structure
211 */
212struct slgt_info {
213 void *if_ptr; /* General purpose pointer (used by SPPP) */
214 struct tty_port port;
215
216 struct slgt_info *next_device; /* device list link */
217
218 int magic;
219
220 char device_name[25];
221 struct pci_dev *pdev;
222
223 int port_count; /* count of ports on adapter */
224 int adapter_num; /* adapter instance number */
225 int port_num; /* port instance number */
226
227 /* array of pointers to port contexts on this adapter */
228 struct slgt_info *port_array[SLGT_MAX_PORTS];
229
230 int line; /* tty line instance number */
231
232 struct mgsl_icount icount;
233
234 int timeout;
235 int x_char; /* xon/xoff character */
236 unsigned int read_status_mask;
237 unsigned int ignore_status_mask;
238
239 wait_queue_head_t status_event_wait_q;
240 wait_queue_head_t event_wait_q;
241 struct timer_list tx_timer;
242 struct timer_list rx_timer;
243
244 unsigned int gpio_present;
245 struct cond_wait *gpio_wait_q;
246
247 spinlock_t lock; /* spinlock for synchronizing with ISR */
248
249 struct work_struct task;
250 u32 pending_bh;
251 bool bh_requested;
252 bool bh_running;
253
254 int isr_overflow;
255 bool irq_requested; /* true if IRQ requested */
256 bool irq_occurred; /* for diagnostics use */
257
258 /* device configuration */
259
260 unsigned int bus_type;
261 unsigned int irq_level;
262 unsigned long irq_flags;
263
264 unsigned char __iomem * reg_addr; /* memory mapped registers address */
265 u32 phys_reg_addr;
266 bool reg_addr_requested;
267
268 MGSL_PARAMS params; /* communications parameters */
269 u32 idle_mode;
270 u32 max_frame_size; /* as set by device config */
271
272 unsigned int rbuf_fill_level;
273 unsigned int rx_pio;
274 unsigned int if_mode;
275 unsigned int base_clock;
276 unsigned int xsync;
277 unsigned int xctrl;
278
279 /* device status */
280
281 bool rx_enabled;
282 bool rx_restart;
283
284 bool tx_enabled;
285 bool tx_active;
286
287 unsigned char signals; /* serial signal states */
288 int init_error; /* initialization error */
289
290 unsigned char *tx_buf;
291 int tx_count;
292
293 char *flag_buf;
294 bool drop_rts_on_tx_done;
295 struct _input_signal_events input_signal_events;
296
297 int dcd_chkcount; /* check counts to prevent */
298 int cts_chkcount; /* too many IRQs if a signal */
299 int dsr_chkcount; /* is floating */
300 int ri_chkcount;
301
302 char *bufs; /* virtual address of DMA buffer lists */
303 dma_addr_t bufs_dma_addr; /* physical address of buffer descriptors */
304
305 unsigned int rbuf_count;
306 struct slgt_desc *rbufs;
307 unsigned int rbuf_current;
308 unsigned int rbuf_index;
309 unsigned int rbuf_fill_index;
310 unsigned short rbuf_fill_count;
311
312 unsigned int tbuf_count;
313 struct slgt_desc *tbufs;
314 unsigned int tbuf_current;
315 unsigned int tbuf_start;
316
317 unsigned char *tmp_rbuf;
318 unsigned int tmp_rbuf_count;
319
320 /* SPPP/Cisco HDLC device parts */
321
322 int netcount;
323 spinlock_t netlock;
324#if SYNCLINK_GENERIC_HDLC
325 struct net_device *netdev;
326#endif
327
328};
329
330static MGSL_PARAMS default_params = {
331 .mode = MGSL_MODE_HDLC,
332 .loopback = 0,
333 .flags = HDLC_FLAG_UNDERRUN_ABORT15,
334 .encoding = HDLC_ENCODING_NRZI_SPACE,
335 .clock_speed = 0,
336 .addr_filter = 0xff,
337 .crc_type = HDLC_CRC_16_CCITT,
338 .preamble_length = HDLC_PREAMBLE_LENGTH_8BITS,
339 .preamble = HDLC_PREAMBLE_PATTERN_NONE,
340 .data_rate = 9600,
341 .data_bits = 8,
342 .stop_bits = 1,
343 .parity = ASYNC_PARITY_NONE
344};
345
346
347#define BH_RECEIVE 1
348#define BH_TRANSMIT 2
349#define BH_STATUS 4
350#define IO_PIN_SHUTDOWN_LIMIT 100
351
352#define DMABUFSIZE 256
353#define DESC_LIST_SIZE 4096
354
355#define MASK_PARITY BIT1
356#define MASK_FRAMING BIT0
357#define MASK_BREAK BIT14
358#define MASK_OVERRUN BIT4
359
360#define GSR 0x00 /* global status */
361#define JCR 0x04 /* JTAG control */
362#define IODR 0x08 /* GPIO direction */
363#define IOER 0x0c /* GPIO interrupt enable */
364#define IOVR 0x10 /* GPIO value */
365#define IOSR 0x14 /* GPIO interrupt status */
366#define TDR 0x80 /* tx data */
367#define RDR 0x80 /* rx data */
368#define TCR 0x82 /* tx control */
369#define TIR 0x84 /* tx idle */
370#define TPR 0x85 /* tx preamble */
371#define RCR 0x86 /* rx control */
372#define VCR 0x88 /* V.24 control */
373#define CCR 0x89 /* clock control */
374#define BDR 0x8a /* baud divisor */
375#define SCR 0x8c /* serial control */
376#define SSR 0x8e /* serial status */
377#define RDCSR 0x90 /* rx DMA control/status */
378#define TDCSR 0x94 /* tx DMA control/status */
379#define RDDAR 0x98 /* rx DMA descriptor address */
380#define TDDAR 0x9c /* tx DMA descriptor address */
381#define XSR 0x40 /* extended sync pattern */
382#define XCR 0x44 /* extended control */
383
384#define RXIDLE BIT14
385#define RXBREAK BIT14
386#define IRQ_TXDATA BIT13
387#define IRQ_TXIDLE BIT12
388#define IRQ_TXUNDER BIT11 /* HDLC */
389#define IRQ_RXDATA BIT10
390#define IRQ_RXIDLE BIT9 /* HDLC */
391#define IRQ_RXBREAK BIT9 /* async */
392#define IRQ_RXOVER BIT8
393#define IRQ_DSR BIT7
394#define IRQ_CTS BIT6
395#define IRQ_DCD BIT5
396#define IRQ_RI BIT4
397#define IRQ_ALL 0x3ff0
398#define IRQ_MASTER BIT0
399
400#define slgt_irq_on(info, mask) \
401 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) | (mask)))
402#define slgt_irq_off(info, mask) \
403 wr_reg16((info), SCR, (unsigned short)(rd_reg16((info), SCR) & ~(mask)))
404
405static __u8 rd_reg8(struct slgt_info *info, unsigned int addr);
406static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value);
407static __u16 rd_reg16(struct slgt_info *info, unsigned int addr);
408static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value);
409static __u32 rd_reg32(struct slgt_info *info, unsigned int addr);
410static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value);
411
412static void msc_set_vcr(struct slgt_info *info);
413
414static int startup(struct slgt_info *info);
415static int block_til_ready(struct tty_struct *tty, struct file * filp,struct slgt_info *info);
416static void shutdown(struct slgt_info *info);
417static void program_hw(struct slgt_info *info);
418static void change_params(struct slgt_info *info);
419
420static int adapter_test(struct slgt_info *info);
421
422static void reset_port(struct slgt_info *info);
423static void async_mode(struct slgt_info *info);
424static void sync_mode(struct slgt_info *info);
425
426static void rx_stop(struct slgt_info *info);
427static void rx_start(struct slgt_info *info);
428static void reset_rbufs(struct slgt_info *info);
429static void free_rbufs(struct slgt_info *info, unsigned int first, unsigned int last);
430static bool rx_get_frame(struct slgt_info *info);
431static bool rx_get_buf(struct slgt_info *info);
432
433static void tx_start(struct slgt_info *info);
434static void tx_stop(struct slgt_info *info);
435static void tx_set_idle(struct slgt_info *info);
436static unsigned int tbuf_bytes(struct slgt_info *info);
437static void reset_tbufs(struct slgt_info *info);
438static void tdma_reset(struct slgt_info *info);
439static bool tx_load(struct slgt_info *info, const char *buf, unsigned int count);
440
441static void get_gtsignals(struct slgt_info *info);
442static void set_gtsignals(struct slgt_info *info);
443static void set_rate(struct slgt_info *info, u32 data_rate);
444
445static void bh_transmit(struct slgt_info *info);
446static void isr_txeom(struct slgt_info *info, unsigned short status);
447
448static void tx_timeout(struct timer_list *t);
449static void rx_timeout(struct timer_list *t);
450
451/*
452 * ioctl handlers
453 */
454static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount);
455static int get_params(struct slgt_info *info, MGSL_PARAMS __user *params);
456static int set_params(struct slgt_info *info, MGSL_PARAMS __user *params);
457static int get_txidle(struct slgt_info *info, int __user *idle_mode);
458static int set_txidle(struct slgt_info *info, int idle_mode);
459static int tx_enable(struct slgt_info *info, int enable);
460static int tx_abort(struct slgt_info *info);
461static int rx_enable(struct slgt_info *info, int enable);
462static int modem_input_wait(struct slgt_info *info,int arg);
463static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
464static int get_interface(struct slgt_info *info, int __user *if_mode);
465static int set_interface(struct slgt_info *info, int if_mode);
466static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
467static int get_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
468static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
469static int get_xsync(struct slgt_info *info, int __user *if_mode);
470static int set_xsync(struct slgt_info *info, int if_mode);
471static int get_xctrl(struct slgt_info *info, int __user *if_mode);
472static int set_xctrl(struct slgt_info *info, int if_mode);
473
474/*
475 * driver functions
476 */
477static void release_resources(struct slgt_info *info);
478
479/*
480 * DEBUG OUTPUT CODE
481 */
482#ifndef DBGINFO
483#define DBGINFO(fmt)
484#endif
485#ifndef DBGERR
486#define DBGERR(fmt)
487#endif
488#ifndef DBGBH
489#define DBGBH(fmt)
490#endif
491#ifndef DBGISR
492#define DBGISR(fmt)
493#endif
494
495#ifdef DBGDATA
496static void trace_block(struct slgt_info *info, const char *data, int count, const char *label)
497{
498 int i;
499 int linecount;
500 printk("%s %s data:\n",info->device_name, label);
501 while(count) {
502 linecount = (count > 16) ? 16 : count;
503 for(i=0; i < linecount; i++)
504 printk("%02X ",(unsigned char)data[i]);
505 for(;i<17;i++)
506 printk(" ");
507 for(i=0;i<linecount;i++) {
508 if (data[i]>=040 && data[i]<=0176)
509 printk("%c",data[i]);
510 else
511 printk(".");
512 }
513 printk("\n");
514 data += linecount;
515 count -= linecount;
516 }
517}
518#else
519#define DBGDATA(info, buf, size, label)
520#endif
521
522#ifdef DBGTBUF
523static void dump_tbufs(struct slgt_info *info)
524{
525 int i;
526 printk("tbuf_current=%d\n", info->tbuf_current);
527 for (i=0 ; i < info->tbuf_count ; i++) {
528 printk("%d: count=%04X status=%04X\n",
529 i, le16_to_cpu(info->tbufs[i].count), le16_to_cpu(info->tbufs[i].status));
530 }
531}
532#else
533#define DBGTBUF(info)
534#endif
535
536#ifdef DBGRBUF
537static void dump_rbufs(struct slgt_info *info)
538{
539 int i;
540 printk("rbuf_current=%d\n", info->rbuf_current);
541 for (i=0 ; i < info->rbuf_count ; i++) {
542 printk("%d: count=%04X status=%04X\n",
543 i, le16_to_cpu(info->rbufs[i].count), le16_to_cpu(info->rbufs[i].status));
544 }
545}
546#else
547#define DBGRBUF(info)
548#endif
549
550static inline int sanity_check(struct slgt_info *info, char *devname, const char *name)
551{
552#ifdef SANITY_CHECK
553 if (!info) {
554 printk("null struct slgt_info for (%s) in %s\n", devname, name);
555 return 1;
556 }
557 if (info->magic != MGSL_MAGIC) {
558 printk("bad magic number struct slgt_info (%s) in %s\n", devname, name);
559 return 1;
560 }
561#else
562 if (!info)
563 return 1;
564#endif
565 return 0;
566}
567
568/*
569 * line discipline callback wrappers
570 *
571 * The wrappers maintain line discipline references
572 * while calling into the line discipline.
573 *
574 * ldisc_receive_buf - pass receive data to line discipline
575 */
576static void ldisc_receive_buf(struct tty_struct *tty,
577 const __u8 *data, char *flags, int count)
578{
579 struct tty_ldisc *ld;
580 if (!tty)
581 return;
582 ld = tty_ldisc_ref(tty);
583 if (ld) {
584 if (ld->ops->receive_buf)
585 ld->ops->receive_buf(tty, data, flags, count);
586 tty_ldisc_deref(ld);
587 }
588}
589
590/* tty callbacks */
591
592static int open(struct tty_struct *tty, struct file *filp)
593{
594 struct slgt_info *info;
595 int retval, line;
596 unsigned long flags;
597
598 line = tty->index;
599 if (line >= slgt_device_count) {
600 DBGERR(("%s: open with invalid line #%d.\n", driver_name, line));
601 return -ENODEV;
602 }
603
604 info = slgt_device_list;
605 while(info && info->line != line)
606 info = info->next_device;
607 if (sanity_check(info, tty->name, "open"))
608 return -ENODEV;
609 if (info->init_error) {
610 DBGERR(("%s init error=%d\n", info->device_name, info->init_error));
611 return -ENODEV;
612 }
613
614 tty->driver_data = info;
615 info->port.tty = tty;
616
617 DBGINFO(("%s open, old ref count = %d\n", info->device_name, info->port.count));
618
619 mutex_lock(&info->port.mutex);
620
621 spin_lock_irqsave(&info->netlock, flags);
622 if (info->netcount) {
623 retval = -EBUSY;
624 spin_unlock_irqrestore(&info->netlock, flags);
625 mutex_unlock(&info->port.mutex);
626 goto cleanup;
627 }
628 info->port.count++;
629 spin_unlock_irqrestore(&info->netlock, flags);
630
631 if (info->port.count == 1) {
632 /* 1st open on this device, init hardware */
633 retval = startup(info);
634 if (retval < 0) {
635 mutex_unlock(&info->port.mutex);
636 goto cleanup;
637 }
638 }
639 mutex_unlock(&info->port.mutex);
640 retval = block_til_ready(tty, filp, info);
641 if (retval) {
642 DBGINFO(("%s block_til_ready rc=%d\n", info->device_name, retval));
643 goto cleanup;
644 }
645
646 retval = 0;
647
648cleanup:
649 if (retval) {
650 if (tty->count == 1)
651 info->port.tty = NULL; /* tty layer will release tty struct */
652 if(info->port.count)
653 info->port.count--;
654 }
655
656 DBGINFO(("%s open rc=%d\n", info->device_name, retval));
657 return retval;
658}
659
660static void close(struct tty_struct *tty, struct file *filp)
661{
662 struct slgt_info *info = tty->driver_data;
663
664 if (sanity_check(info, tty->name, "close"))
665 return;
666 DBGINFO(("%s close entry, count=%d\n", info->device_name, info->port.count));
667
668 if (tty_port_close_start(&info->port, tty, filp) == 0)
669 goto cleanup;
670
671 mutex_lock(&info->port.mutex);
672 if (tty_port_initialized(&info->port))
673 wait_until_sent(tty, info->timeout);
674 flush_buffer(tty);
675 tty_ldisc_flush(tty);
676
677 shutdown(info);
678 mutex_unlock(&info->port.mutex);
679
680 tty_port_close_end(&info->port, tty);
681 info->port.tty = NULL;
682cleanup:
683 DBGINFO(("%s close exit, count=%d\n", tty->driver->name, info->port.count));
684}
685
686static void hangup(struct tty_struct *tty)
687{
688 struct slgt_info *info = tty->driver_data;
689 unsigned long flags;
690
691 if (sanity_check(info, tty->name, "hangup"))
692 return;
693 DBGINFO(("%s hangup\n", info->device_name));
694
695 flush_buffer(tty);
696
697 mutex_lock(&info->port.mutex);
698 shutdown(info);
699
700 spin_lock_irqsave(&info->port.lock, flags);
701 info->port.count = 0;
702 info->port.tty = NULL;
703 spin_unlock_irqrestore(&info->port.lock, flags);
704 tty_port_set_active(&info->port, 0);
705 mutex_unlock(&info->port.mutex);
706
707 wake_up_interruptible(&info->port.open_wait);
708}
709
710static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
711{
712 struct slgt_info *info = tty->driver_data;
713 unsigned long flags;
714
715 DBGINFO(("%s set_termios\n", tty->driver->name));
716
717 change_params(info);
718
719 /* Handle transition to B0 status */
720 if ((old_termios->c_cflag & CBAUD) && !C_BAUD(tty)) {
721 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
722 spin_lock_irqsave(&info->lock,flags);
723 set_gtsignals(info);
724 spin_unlock_irqrestore(&info->lock,flags);
725 }
726
727 /* Handle transition away from B0 status */
728 if (!(old_termios->c_cflag & CBAUD) && C_BAUD(tty)) {
729 info->signals |= SerialSignal_DTR;
730 if (!C_CRTSCTS(tty) || !tty_throttled(tty))
731 info->signals |= SerialSignal_RTS;
732 spin_lock_irqsave(&info->lock,flags);
733 set_gtsignals(info);
734 spin_unlock_irqrestore(&info->lock,flags);
735 }
736
737 /* Handle turning off CRTSCTS */
738 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
739 tty->hw_stopped = 0;
740 tx_release(tty);
741 }
742}
743
744static void update_tx_timer(struct slgt_info *info)
745{
746 /*
747 * use worst case speed of 1200bps to calculate transmit timeout
748 * based on data in buffers (tbuf_bytes) and FIFO (128 bytes)
749 */
750 if (info->params.mode == MGSL_MODE_HDLC) {
751 int timeout = (tbuf_bytes(info) * 7) + 1000;
752 mod_timer(&info->tx_timer, jiffies + msecs_to_jiffies(timeout));
753 }
754}
755
756static int write(struct tty_struct *tty,
757 const unsigned char *buf, int count)
758{
759 int ret = 0;
760 struct slgt_info *info = tty->driver_data;
761 unsigned long flags;
762
763 if (sanity_check(info, tty->name, "write"))
764 return -EIO;
765
766 DBGINFO(("%s write count=%d\n", info->device_name, count));
767
768 if (!info->tx_buf || (count > info->max_frame_size))
769 return -EIO;
770
771 if (!count || tty->flow.stopped || tty->hw_stopped)
772 return 0;
773
774 spin_lock_irqsave(&info->lock, flags);
775
776 if (info->tx_count) {
777 /* send accumulated data from send_char() */
778 if (!tx_load(info, info->tx_buf, info->tx_count))
779 goto cleanup;
780 info->tx_count = 0;
781 }
782
783 if (tx_load(info, buf, count))
784 ret = count;
785
786cleanup:
787 spin_unlock_irqrestore(&info->lock, flags);
788 DBGINFO(("%s write rc=%d\n", info->device_name, ret));
789 return ret;
790}
791
792static int put_char(struct tty_struct *tty, unsigned char ch)
793{
794 struct slgt_info *info = tty->driver_data;
795 unsigned long flags;
796 int ret = 0;
797
798 if (sanity_check(info, tty->name, "put_char"))
799 return 0;
800 DBGINFO(("%s put_char(%d)\n", info->device_name, ch));
801 if (!info->tx_buf)
802 return 0;
803 spin_lock_irqsave(&info->lock,flags);
804 if (info->tx_count < info->max_frame_size) {
805 info->tx_buf[info->tx_count++] = ch;
806 ret = 1;
807 }
808 spin_unlock_irqrestore(&info->lock,flags);
809 return ret;
810}
811
812static void send_xchar(struct tty_struct *tty, char ch)
813{
814 struct slgt_info *info = tty->driver_data;
815 unsigned long flags;
816
817 if (sanity_check(info, tty->name, "send_xchar"))
818 return;
819 DBGINFO(("%s send_xchar(%d)\n", info->device_name, ch));
820 info->x_char = ch;
821 if (ch) {
822 spin_lock_irqsave(&info->lock,flags);
823 if (!info->tx_enabled)
824 tx_start(info);
825 spin_unlock_irqrestore(&info->lock,flags);
826 }
827}
828
829static void wait_until_sent(struct tty_struct *tty, int timeout)
830{
831 struct slgt_info *info = tty->driver_data;
832 unsigned long orig_jiffies, char_time;
833
834 if (!info )
835 return;
836 if (sanity_check(info, tty->name, "wait_until_sent"))
837 return;
838 DBGINFO(("%s wait_until_sent entry\n", info->device_name));
839 if (!tty_port_initialized(&info->port))
840 goto exit;
841
842 orig_jiffies = jiffies;
843
844 /* Set check interval to 1/5 of estimated time to
845 * send a character, and make it at least 1. The check
846 * interval should also be less than the timeout.
847 * Note: use tight timings here to satisfy the NIST-PCTS.
848 */
849
850 if (info->params.data_rate) {
851 char_time = info->timeout/(32 * 5);
852 if (!char_time)
853 char_time++;
854 } else
855 char_time = 1;
856
857 if (timeout)
858 char_time = min_t(unsigned long, char_time, timeout);
859
860 while (info->tx_active) {
861 msleep_interruptible(jiffies_to_msecs(char_time));
862 if (signal_pending(current))
863 break;
864 if (timeout && time_after(jiffies, orig_jiffies + timeout))
865 break;
866 }
867exit:
868 DBGINFO(("%s wait_until_sent exit\n", info->device_name));
869}
870
871static unsigned int write_room(struct tty_struct *tty)
872{
873 struct slgt_info *info = tty->driver_data;
874 unsigned int ret;
875
876 if (sanity_check(info, tty->name, "write_room"))
877 return 0;
878 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
879 DBGINFO(("%s write_room=%u\n", info->device_name, ret));
880 return ret;
881}
882
883static void flush_chars(struct tty_struct *tty)
884{
885 struct slgt_info *info = tty->driver_data;
886 unsigned long flags;
887
888 if (sanity_check(info, tty->name, "flush_chars"))
889 return;
890 DBGINFO(("%s flush_chars entry tx_count=%d\n", info->device_name, info->tx_count));
891
892 if (info->tx_count <= 0 || tty->flow.stopped ||
893 tty->hw_stopped || !info->tx_buf)
894 return;
895
896 DBGINFO(("%s flush_chars start transmit\n", info->device_name));
897
898 spin_lock_irqsave(&info->lock,flags);
899 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
900 info->tx_count = 0;
901 spin_unlock_irqrestore(&info->lock,flags);
902}
903
904static void flush_buffer(struct tty_struct *tty)
905{
906 struct slgt_info *info = tty->driver_data;
907 unsigned long flags;
908
909 if (sanity_check(info, tty->name, "flush_buffer"))
910 return;
911 DBGINFO(("%s flush_buffer\n", info->device_name));
912
913 spin_lock_irqsave(&info->lock, flags);
914 info->tx_count = 0;
915 spin_unlock_irqrestore(&info->lock, flags);
916
917 tty_wakeup(tty);
918}
919
920/*
921 * throttle (stop) transmitter
922 */
923static void tx_hold(struct tty_struct *tty)
924{
925 struct slgt_info *info = tty->driver_data;
926 unsigned long flags;
927
928 if (sanity_check(info, tty->name, "tx_hold"))
929 return;
930 DBGINFO(("%s tx_hold\n", info->device_name));
931 spin_lock_irqsave(&info->lock,flags);
932 if (info->tx_enabled && info->params.mode == MGSL_MODE_ASYNC)
933 tx_stop(info);
934 spin_unlock_irqrestore(&info->lock,flags);
935}
936
937/*
938 * release (start) transmitter
939 */
940static void tx_release(struct tty_struct *tty)
941{
942 struct slgt_info *info = tty->driver_data;
943 unsigned long flags;
944
945 if (sanity_check(info, tty->name, "tx_release"))
946 return;
947 DBGINFO(("%s tx_release\n", info->device_name));
948 spin_lock_irqsave(&info->lock, flags);
949 if (info->tx_count && tx_load(info, info->tx_buf, info->tx_count))
950 info->tx_count = 0;
951 spin_unlock_irqrestore(&info->lock, flags);
952}
953
954/*
955 * Service an IOCTL request
956 *
957 * Arguments
958 *
959 * tty pointer to tty instance data
960 * cmd IOCTL command code
961 * arg command argument/context
962 *
963 * Return 0 if success, otherwise error code
964 */
965static int ioctl(struct tty_struct *tty,
966 unsigned int cmd, unsigned long arg)
967{
968 struct slgt_info *info = tty->driver_data;
969 void __user *argp = (void __user *)arg;
970 int ret;
971
972 if (sanity_check(info, tty->name, "ioctl"))
973 return -ENODEV;
974 DBGINFO(("%s ioctl() cmd=%08X\n", info->device_name, cmd));
975
976 if (cmd != TIOCMIWAIT) {
977 if (tty_io_error(tty))
978 return -EIO;
979 }
980
981 switch (cmd) {
982 case MGSL_IOCWAITEVENT:
983 return wait_mgsl_event(info, argp);
984 case TIOCMIWAIT:
985 return modem_input_wait(info,(int)arg);
986 case MGSL_IOCSGPIO:
987 return set_gpio(info, argp);
988 case MGSL_IOCGGPIO:
989 return get_gpio(info, argp);
990 case MGSL_IOCWAITGPIO:
991 return wait_gpio(info, argp);
992 case MGSL_IOCGXSYNC:
993 return get_xsync(info, argp);
994 case MGSL_IOCSXSYNC:
995 return set_xsync(info, (int)arg);
996 case MGSL_IOCGXCTRL:
997 return get_xctrl(info, argp);
998 case MGSL_IOCSXCTRL:
999 return set_xctrl(info, (int)arg);
1000 }
1001 mutex_lock(&info->port.mutex);
1002 switch (cmd) {
1003 case MGSL_IOCGPARAMS:
1004 ret = get_params(info, argp);
1005 break;
1006 case MGSL_IOCSPARAMS:
1007 ret = set_params(info, argp);
1008 break;
1009 case MGSL_IOCGTXIDLE:
1010 ret = get_txidle(info, argp);
1011 break;
1012 case MGSL_IOCSTXIDLE:
1013 ret = set_txidle(info, (int)arg);
1014 break;
1015 case MGSL_IOCTXENABLE:
1016 ret = tx_enable(info, (int)arg);
1017 break;
1018 case MGSL_IOCRXENABLE:
1019 ret = rx_enable(info, (int)arg);
1020 break;
1021 case MGSL_IOCTXABORT:
1022 ret = tx_abort(info);
1023 break;
1024 case MGSL_IOCGSTATS:
1025 ret = get_stats(info, argp);
1026 break;
1027 case MGSL_IOCGIF:
1028 ret = get_interface(info, argp);
1029 break;
1030 case MGSL_IOCSIF:
1031 ret = set_interface(info,(int)arg);
1032 break;
1033 default:
1034 ret = -ENOIOCTLCMD;
1035 }
1036 mutex_unlock(&info->port.mutex);
1037 return ret;
1038}
1039
1040static int get_icount(struct tty_struct *tty,
1041 struct serial_icounter_struct *icount)
1042
1043{
1044 struct slgt_info *info = tty->driver_data;
1045 struct mgsl_icount cnow; /* kernel counter temps */
1046 unsigned long flags;
1047
1048 spin_lock_irqsave(&info->lock,flags);
1049 cnow = info->icount;
1050 spin_unlock_irqrestore(&info->lock,flags);
1051
1052 icount->cts = cnow.cts;
1053 icount->dsr = cnow.dsr;
1054 icount->rng = cnow.rng;
1055 icount->dcd = cnow.dcd;
1056 icount->rx = cnow.rx;
1057 icount->tx = cnow.tx;
1058 icount->frame = cnow.frame;
1059 icount->overrun = cnow.overrun;
1060 icount->parity = cnow.parity;
1061 icount->brk = cnow.brk;
1062 icount->buf_overrun = cnow.buf_overrun;
1063
1064 return 0;
1065}
1066
1067/*
1068 * support for 32 bit ioctl calls on 64 bit systems
1069 */
1070#ifdef CONFIG_COMPAT
1071static long get_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *user_params)
1072{
1073 struct MGSL_PARAMS32 tmp_params;
1074
1075 DBGINFO(("%s get_params32\n", info->device_name));
1076 memset(&tmp_params, 0, sizeof(tmp_params));
1077 tmp_params.mode = (compat_ulong_t)info->params.mode;
1078 tmp_params.loopback = info->params.loopback;
1079 tmp_params.flags = info->params.flags;
1080 tmp_params.encoding = info->params.encoding;
1081 tmp_params.clock_speed = (compat_ulong_t)info->params.clock_speed;
1082 tmp_params.addr_filter = info->params.addr_filter;
1083 tmp_params.crc_type = info->params.crc_type;
1084 tmp_params.preamble_length = info->params.preamble_length;
1085 tmp_params.preamble = info->params.preamble;
1086 tmp_params.data_rate = (compat_ulong_t)info->params.data_rate;
1087 tmp_params.data_bits = info->params.data_bits;
1088 tmp_params.stop_bits = info->params.stop_bits;
1089 tmp_params.parity = info->params.parity;
1090 if (copy_to_user(user_params, &tmp_params, sizeof(struct MGSL_PARAMS32)))
1091 return -EFAULT;
1092 return 0;
1093}
1094
1095static long set_params32(struct slgt_info *info, struct MGSL_PARAMS32 __user *new_params)
1096{
1097 struct MGSL_PARAMS32 tmp_params;
1098
1099 DBGINFO(("%s set_params32\n", info->device_name));
1100 if (copy_from_user(&tmp_params, new_params, sizeof(struct MGSL_PARAMS32)))
1101 return -EFAULT;
1102
1103 spin_lock(&info->lock);
1104 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK) {
1105 info->base_clock = tmp_params.clock_speed;
1106 } else {
1107 info->params.mode = tmp_params.mode;
1108 info->params.loopback = tmp_params.loopback;
1109 info->params.flags = tmp_params.flags;
1110 info->params.encoding = tmp_params.encoding;
1111 info->params.clock_speed = tmp_params.clock_speed;
1112 info->params.addr_filter = tmp_params.addr_filter;
1113 info->params.crc_type = tmp_params.crc_type;
1114 info->params.preamble_length = tmp_params.preamble_length;
1115 info->params.preamble = tmp_params.preamble;
1116 info->params.data_rate = tmp_params.data_rate;
1117 info->params.data_bits = tmp_params.data_bits;
1118 info->params.stop_bits = tmp_params.stop_bits;
1119 info->params.parity = tmp_params.parity;
1120 }
1121 spin_unlock(&info->lock);
1122
1123 program_hw(info);
1124
1125 return 0;
1126}
1127
1128static long slgt_compat_ioctl(struct tty_struct *tty,
1129 unsigned int cmd, unsigned long arg)
1130{
1131 struct slgt_info *info = tty->driver_data;
1132 int rc;
1133
1134 if (sanity_check(info, tty->name, "compat_ioctl"))
1135 return -ENODEV;
1136 DBGINFO(("%s compat_ioctl() cmd=%08X\n", info->device_name, cmd));
1137
1138 switch (cmd) {
1139 case MGSL_IOCSPARAMS32:
1140 rc = set_params32(info, compat_ptr(arg));
1141 break;
1142
1143 case MGSL_IOCGPARAMS32:
1144 rc = get_params32(info, compat_ptr(arg));
1145 break;
1146
1147 case MGSL_IOCGPARAMS:
1148 case MGSL_IOCSPARAMS:
1149 case MGSL_IOCGTXIDLE:
1150 case MGSL_IOCGSTATS:
1151 case MGSL_IOCWAITEVENT:
1152 case MGSL_IOCGIF:
1153 case MGSL_IOCSGPIO:
1154 case MGSL_IOCGGPIO:
1155 case MGSL_IOCWAITGPIO:
1156 case MGSL_IOCGXSYNC:
1157 case MGSL_IOCGXCTRL:
1158 rc = ioctl(tty, cmd, (unsigned long)compat_ptr(arg));
1159 break;
1160 default:
1161 rc = ioctl(tty, cmd, arg);
1162 }
1163 DBGINFO(("%s compat_ioctl() cmd=%08X rc=%d\n", info->device_name, cmd, rc));
1164 return rc;
1165}
1166#else
1167#define slgt_compat_ioctl NULL
1168#endif /* ifdef CONFIG_COMPAT */
1169
1170/*
1171 * proc fs support
1172 */
1173static inline void line_info(struct seq_file *m, struct slgt_info *info)
1174{
1175 char stat_buf[30];
1176 unsigned long flags;
1177
1178 seq_printf(m, "%s: IO=%08X IRQ=%d MaxFrameSize=%u\n",
1179 info->device_name, info->phys_reg_addr,
1180 info->irq_level, info->max_frame_size);
1181
1182 /* output current serial signal states */
1183 spin_lock_irqsave(&info->lock,flags);
1184 get_gtsignals(info);
1185 spin_unlock_irqrestore(&info->lock,flags);
1186
1187 stat_buf[0] = 0;
1188 stat_buf[1] = 0;
1189 if (info->signals & SerialSignal_RTS)
1190 strcat(stat_buf, "|RTS");
1191 if (info->signals & SerialSignal_CTS)
1192 strcat(stat_buf, "|CTS");
1193 if (info->signals & SerialSignal_DTR)
1194 strcat(stat_buf, "|DTR");
1195 if (info->signals & SerialSignal_DSR)
1196 strcat(stat_buf, "|DSR");
1197 if (info->signals & SerialSignal_DCD)
1198 strcat(stat_buf, "|CD");
1199 if (info->signals & SerialSignal_RI)
1200 strcat(stat_buf, "|RI");
1201
1202 if (info->params.mode != MGSL_MODE_ASYNC) {
1203 seq_printf(m, "\tHDLC txok:%d rxok:%d",
1204 info->icount.txok, info->icount.rxok);
1205 if (info->icount.txunder)
1206 seq_printf(m, " txunder:%d", info->icount.txunder);
1207 if (info->icount.txabort)
1208 seq_printf(m, " txabort:%d", info->icount.txabort);
1209 if (info->icount.rxshort)
1210 seq_printf(m, " rxshort:%d", info->icount.rxshort);
1211 if (info->icount.rxlong)
1212 seq_printf(m, " rxlong:%d", info->icount.rxlong);
1213 if (info->icount.rxover)
1214 seq_printf(m, " rxover:%d", info->icount.rxover);
1215 if (info->icount.rxcrc)
1216 seq_printf(m, " rxcrc:%d", info->icount.rxcrc);
1217 } else {
1218 seq_printf(m, "\tASYNC tx:%d rx:%d",
1219 info->icount.tx, info->icount.rx);
1220 if (info->icount.frame)
1221 seq_printf(m, " fe:%d", info->icount.frame);
1222 if (info->icount.parity)
1223 seq_printf(m, " pe:%d", info->icount.parity);
1224 if (info->icount.brk)
1225 seq_printf(m, " brk:%d", info->icount.brk);
1226 if (info->icount.overrun)
1227 seq_printf(m, " oe:%d", info->icount.overrun);
1228 }
1229
1230 /* Append serial signal status to end */
1231 seq_printf(m, " %s\n", stat_buf+1);
1232
1233 seq_printf(m, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1234 info->tx_active,info->bh_requested,info->bh_running,
1235 info->pending_bh);
1236}
1237
1238/* Called to print information about devices
1239 */
1240static int synclink_gt_proc_show(struct seq_file *m, void *v)
1241{
1242 struct slgt_info *info;
1243
1244 seq_puts(m, "synclink_gt driver\n");
1245
1246 info = slgt_device_list;
1247 while( info ) {
1248 line_info(m, info);
1249 info = info->next_device;
1250 }
1251 return 0;
1252}
1253
1254/*
1255 * return count of bytes in transmit buffer
1256 */
1257static unsigned int chars_in_buffer(struct tty_struct *tty)
1258{
1259 struct slgt_info *info = tty->driver_data;
1260 unsigned int count;
1261 if (sanity_check(info, tty->name, "chars_in_buffer"))
1262 return 0;
1263 count = tbuf_bytes(info);
1264 DBGINFO(("%s chars_in_buffer()=%u\n", info->device_name, count));
1265 return count;
1266}
1267
1268/*
1269 * signal remote device to throttle send data (our receive data)
1270 */
1271static void throttle(struct tty_struct * tty)
1272{
1273 struct slgt_info *info = tty->driver_data;
1274 unsigned long flags;
1275
1276 if (sanity_check(info, tty->name, "throttle"))
1277 return;
1278 DBGINFO(("%s throttle\n", info->device_name));
1279 if (I_IXOFF(tty))
1280 send_xchar(tty, STOP_CHAR(tty));
1281 if (C_CRTSCTS(tty)) {
1282 spin_lock_irqsave(&info->lock,flags);
1283 info->signals &= ~SerialSignal_RTS;
1284 set_gtsignals(info);
1285 spin_unlock_irqrestore(&info->lock,flags);
1286 }
1287}
1288
1289/*
1290 * signal remote device to stop throttling send data (our receive data)
1291 */
1292static void unthrottle(struct tty_struct * tty)
1293{
1294 struct slgt_info *info = tty->driver_data;
1295 unsigned long flags;
1296
1297 if (sanity_check(info, tty->name, "unthrottle"))
1298 return;
1299 DBGINFO(("%s unthrottle\n", info->device_name));
1300 if (I_IXOFF(tty)) {
1301 if (info->x_char)
1302 info->x_char = 0;
1303 else
1304 send_xchar(tty, START_CHAR(tty));
1305 }
1306 if (C_CRTSCTS(tty)) {
1307 spin_lock_irqsave(&info->lock,flags);
1308 info->signals |= SerialSignal_RTS;
1309 set_gtsignals(info);
1310 spin_unlock_irqrestore(&info->lock,flags);
1311 }
1312}
1313
1314/*
1315 * set or clear transmit break condition
1316 * break_state -1=set break condition, 0=clear
1317 */
1318static int set_break(struct tty_struct *tty, int break_state)
1319{
1320 struct slgt_info *info = tty->driver_data;
1321 unsigned short value;
1322 unsigned long flags;
1323
1324 if (sanity_check(info, tty->name, "set_break"))
1325 return -EINVAL;
1326 DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
1327
1328 spin_lock_irqsave(&info->lock,flags);
1329 value = rd_reg16(info, TCR);
1330 if (break_state == -1)
1331 value |= BIT6;
1332 else
1333 value &= ~BIT6;
1334 wr_reg16(info, TCR, value);
1335 spin_unlock_irqrestore(&info->lock,flags);
1336 return 0;
1337}
1338
1339#if SYNCLINK_GENERIC_HDLC
1340
1341/**
1342 * hdlcdev_attach - called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1343 * @dev: pointer to network device structure
1344 * @encoding: serial encoding setting
1345 * @parity: FCS setting
1346 *
1347 * Set encoding and frame check sequence (FCS) options.
1348 *
1349 * Return: 0 if success, otherwise error code
1350 */
1351static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1352 unsigned short parity)
1353{
1354 struct slgt_info *info = dev_to_port(dev);
1355 unsigned char new_encoding;
1356 unsigned short new_crctype;
1357
1358 /* return error if TTY interface open */
1359 if (info->port.count)
1360 return -EBUSY;
1361
1362 DBGINFO(("%s hdlcdev_attach\n", info->device_name));
1363
1364 switch (encoding)
1365 {
1366 case ENCODING_NRZ: new_encoding = HDLC_ENCODING_NRZ; break;
1367 case ENCODING_NRZI: new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1368 case ENCODING_FM_MARK: new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1369 case ENCODING_FM_SPACE: new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1370 case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1371 default: return -EINVAL;
1372 }
1373
1374 switch (parity)
1375 {
1376 case PARITY_NONE: new_crctype = HDLC_CRC_NONE; break;
1377 case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1378 case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1379 default: return -EINVAL;
1380 }
1381
1382 info->params.encoding = new_encoding;
1383 info->params.crc_type = new_crctype;
1384
1385 /* if network interface up, reprogram hardware */
1386 if (info->netcount)
1387 program_hw(info);
1388
1389 return 0;
1390}
1391
1392/**
1393 * hdlcdev_xmit - called by generic HDLC layer to send a frame
1394 * @skb: socket buffer containing HDLC frame
1395 * @dev: pointer to network device structure
1396 */
1397static netdev_tx_t hdlcdev_xmit(struct sk_buff *skb,
1398 struct net_device *dev)
1399{
1400 struct slgt_info *info = dev_to_port(dev);
1401 unsigned long flags;
1402
1403 DBGINFO(("%s hdlc_xmit\n", dev->name));
1404
1405 if (!skb->len)
1406 return NETDEV_TX_OK;
1407
1408 /* stop sending until this frame completes */
1409 netif_stop_queue(dev);
1410
1411 /* update network statistics */
1412 dev->stats.tx_packets++;
1413 dev->stats.tx_bytes += skb->len;
1414
1415 /* save start time for transmit timeout detection */
1416 netif_trans_update(dev);
1417
1418 spin_lock_irqsave(&info->lock, flags);
1419 tx_load(info, skb->data, skb->len);
1420 spin_unlock_irqrestore(&info->lock, flags);
1421
1422 /* done with socket buffer, so free it */
1423 dev_kfree_skb(skb);
1424
1425 return NETDEV_TX_OK;
1426}
1427
1428/**
1429 * hdlcdev_open - called by network layer when interface enabled
1430 * @dev: pointer to network device structure
1431 *
1432 * Claim resources and initialize hardware.
1433 *
1434 * Return: 0 if success, otherwise error code
1435 */
1436static int hdlcdev_open(struct net_device *dev)
1437{
1438 struct slgt_info *info = dev_to_port(dev);
1439 int rc;
1440 unsigned long flags;
1441
1442 if (!try_module_get(THIS_MODULE))
1443 return -EBUSY;
1444
1445 DBGINFO(("%s hdlcdev_open\n", dev->name));
1446
1447 /* generic HDLC layer open processing */
1448 rc = hdlc_open(dev);
1449 if (rc)
1450 return rc;
1451
1452 /* arbitrate between network and tty opens */
1453 spin_lock_irqsave(&info->netlock, flags);
1454 if (info->port.count != 0 || info->netcount != 0) {
1455 DBGINFO(("%s hdlc_open busy\n", dev->name));
1456 spin_unlock_irqrestore(&info->netlock, flags);
1457 return -EBUSY;
1458 }
1459 info->netcount=1;
1460 spin_unlock_irqrestore(&info->netlock, flags);
1461
1462 /* claim resources and init adapter */
1463 if ((rc = startup(info)) != 0) {
1464 spin_lock_irqsave(&info->netlock, flags);
1465 info->netcount=0;
1466 spin_unlock_irqrestore(&info->netlock, flags);
1467 return rc;
1468 }
1469
1470 /* assert RTS and DTR, apply hardware settings */
1471 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
1472 program_hw(info);
1473
1474 /* enable network layer transmit */
1475 netif_trans_update(dev);
1476 netif_start_queue(dev);
1477
1478 /* inform generic HDLC layer of current DCD status */
1479 spin_lock_irqsave(&info->lock, flags);
1480 get_gtsignals(info);
1481 spin_unlock_irqrestore(&info->lock, flags);
1482 if (info->signals & SerialSignal_DCD)
1483 netif_carrier_on(dev);
1484 else
1485 netif_carrier_off(dev);
1486 return 0;
1487}
1488
1489/**
1490 * hdlcdev_close - called by network layer when interface is disabled
1491 * @dev: pointer to network device structure
1492 *
1493 * Shutdown hardware and release resources.
1494 *
1495 * Return: 0 if success, otherwise error code
1496 */
1497static int hdlcdev_close(struct net_device *dev)
1498{
1499 struct slgt_info *info = dev_to_port(dev);
1500 unsigned long flags;
1501
1502 DBGINFO(("%s hdlcdev_close\n", dev->name));
1503
1504 netif_stop_queue(dev);
1505
1506 /* shutdown adapter and release resources */
1507 shutdown(info);
1508
1509 hdlc_close(dev);
1510
1511 spin_lock_irqsave(&info->netlock, flags);
1512 info->netcount=0;
1513 spin_unlock_irqrestore(&info->netlock, flags);
1514
1515 module_put(THIS_MODULE);
1516 return 0;
1517}
1518
1519/**
1520 * hdlcdev_ioctl - called by network layer to process IOCTL call to network device
1521 * @dev: pointer to network device structure
1522 * @ifr: pointer to network interface request structure
1523 * @cmd: IOCTL command code
1524 *
1525 * Return: 0 if success, otherwise error code
1526 */
1527static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1528{
1529 const size_t size = sizeof(sync_serial_settings);
1530 sync_serial_settings new_line;
1531 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1532 struct slgt_info *info = dev_to_port(dev);
1533 unsigned int flags;
1534
1535 DBGINFO(("%s hdlcdev_ioctl\n", dev->name));
1536
1537 /* return error if TTY interface open */
1538 if (info->port.count)
1539 return -EBUSY;
1540
1541 if (cmd != SIOCWANDEV)
1542 return hdlc_ioctl(dev, ifr, cmd);
1543
1544 memset(&new_line, 0, sizeof(new_line));
1545
1546 switch(ifr->ifr_settings.type) {
1547 case IF_GET_IFACE: /* return current sync_serial_settings */
1548
1549 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1550 if (ifr->ifr_settings.size < size) {
1551 ifr->ifr_settings.size = size; /* data size wanted */
1552 return -ENOBUFS;
1553 }
1554
1555 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1556 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1557 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1558 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1559
1560 switch (flags){
1561 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1562 case (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_INT; break;
1563 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG): new_line.clock_type = CLOCK_TXINT; break;
1564 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1565 default: new_line.clock_type = CLOCK_DEFAULT;
1566 }
1567
1568 new_line.clock_rate = info->params.clock_speed;
1569 new_line.loopback = info->params.loopback ? 1:0;
1570
1571 if (copy_to_user(line, &new_line, size))
1572 return -EFAULT;
1573 return 0;
1574
1575 case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1576
1577 if(!capable(CAP_NET_ADMIN))
1578 return -EPERM;
1579 if (copy_from_user(&new_line, line, size))
1580 return -EFAULT;
1581
1582 switch (new_line.clock_type)
1583 {
1584 case CLOCK_EXT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1585 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1586 case CLOCK_INT: flags = HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG; break;
1587 case CLOCK_TXINT: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG; break;
1588 case CLOCK_DEFAULT: flags = info->params.flags &
1589 (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1590 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1591 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1592 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN); break;
1593 default: return -EINVAL;
1594 }
1595
1596 if (new_line.loopback != 0 && new_line.loopback != 1)
1597 return -EINVAL;
1598
1599 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1600 HDLC_FLAG_RXC_BRG | HDLC_FLAG_RXC_TXCPIN |
1601 HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1602 HDLC_FLAG_TXC_BRG | HDLC_FLAG_TXC_RXCPIN);
1603 info->params.flags |= flags;
1604
1605 info->params.loopback = new_line.loopback;
1606
1607 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1608 info->params.clock_speed = new_line.clock_rate;
1609 else
1610 info->params.clock_speed = 0;
1611
1612 /* if network interface up, reprogram hardware */
1613 if (info->netcount)
1614 program_hw(info);
1615 return 0;
1616
1617 default:
1618 return hdlc_ioctl(dev, ifr, cmd);
1619 }
1620}
1621
1622/**
1623 * hdlcdev_tx_timeout - called by network layer when transmit timeout is detected
1624 * @dev: pointer to network device structure
1625 * @txqueue: unused
1626 */
1627static void hdlcdev_tx_timeout(struct net_device *dev, unsigned int txqueue)
1628{
1629 struct slgt_info *info = dev_to_port(dev);
1630 unsigned long flags;
1631
1632 DBGINFO(("%s hdlcdev_tx_timeout\n", dev->name));
1633
1634 dev->stats.tx_errors++;
1635 dev->stats.tx_aborted_errors++;
1636
1637 spin_lock_irqsave(&info->lock,flags);
1638 tx_stop(info);
1639 spin_unlock_irqrestore(&info->lock,flags);
1640
1641 netif_wake_queue(dev);
1642}
1643
1644/**
1645 * hdlcdev_tx_done - called by device driver when transmit completes
1646 * @info: pointer to device instance information
1647 *
1648 * Reenable network layer transmit if stopped.
1649 */
1650static void hdlcdev_tx_done(struct slgt_info *info)
1651{
1652 if (netif_queue_stopped(info->netdev))
1653 netif_wake_queue(info->netdev);
1654}
1655
1656/**
1657 * hdlcdev_rx - called by device driver when frame received
1658 * @info: pointer to device instance information
1659 * @buf: pointer to buffer contianing frame data
1660 * @size: count of data bytes in buf
1661 *
1662 * Pass frame to network layer.
1663 */
1664static void hdlcdev_rx(struct slgt_info *info, char *buf, int size)
1665{
1666 struct sk_buff *skb = dev_alloc_skb(size);
1667 struct net_device *dev = info->netdev;
1668
1669 DBGINFO(("%s hdlcdev_rx\n", dev->name));
1670
1671 if (skb == NULL) {
1672 DBGERR(("%s: can't alloc skb, drop packet\n", dev->name));
1673 dev->stats.rx_dropped++;
1674 return;
1675 }
1676
1677 skb_put_data(skb, buf, size);
1678
1679 skb->protocol = hdlc_type_trans(skb, dev);
1680
1681 dev->stats.rx_packets++;
1682 dev->stats.rx_bytes += size;
1683
1684 netif_rx(skb);
1685}
1686
1687static const struct net_device_ops hdlcdev_ops = {
1688 .ndo_open = hdlcdev_open,
1689 .ndo_stop = hdlcdev_close,
1690 .ndo_start_xmit = hdlc_start_xmit,
1691 .ndo_do_ioctl = hdlcdev_ioctl,
1692 .ndo_tx_timeout = hdlcdev_tx_timeout,
1693};
1694
1695/**
1696 * hdlcdev_init - called by device driver when adding device instance
1697 * @info: pointer to device instance information
1698 *
1699 * Do generic HDLC initialization.
1700 *
1701 * Return: 0 if success, otherwise error code
1702 */
1703static int hdlcdev_init(struct slgt_info *info)
1704{
1705 int rc;
1706 struct net_device *dev;
1707 hdlc_device *hdlc;
1708
1709 /* allocate and initialize network and HDLC layer objects */
1710
1711 dev = alloc_hdlcdev(info);
1712 if (!dev) {
1713 printk(KERN_ERR "%s hdlc device alloc failure\n", info->device_name);
1714 return -ENOMEM;
1715 }
1716
1717 /* for network layer reporting purposes only */
1718 dev->mem_start = info->phys_reg_addr;
1719 dev->mem_end = info->phys_reg_addr + SLGT_REG_SIZE - 1;
1720 dev->irq = info->irq_level;
1721
1722 /* network layer callbacks and settings */
1723 dev->netdev_ops = &hdlcdev_ops;
1724 dev->watchdog_timeo = 10 * HZ;
1725 dev->tx_queue_len = 50;
1726
1727 /* generic HDLC layer callbacks and settings */
1728 hdlc = dev_to_hdlc(dev);
1729 hdlc->attach = hdlcdev_attach;
1730 hdlc->xmit = hdlcdev_xmit;
1731
1732 /* register objects with HDLC layer */
1733 rc = register_hdlc_device(dev);
1734 if (rc) {
1735 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
1736 free_netdev(dev);
1737 return rc;
1738 }
1739
1740 info->netdev = dev;
1741 return 0;
1742}
1743
1744/**
1745 * hdlcdev_exit - called by device driver when removing device instance
1746 * @info: pointer to device instance information
1747 *
1748 * Do generic HDLC cleanup.
1749 */
1750static void hdlcdev_exit(struct slgt_info *info)
1751{
1752 unregister_hdlc_device(info->netdev);
1753 free_netdev(info->netdev);
1754 info->netdev = NULL;
1755}
1756
1757#endif /* ifdef CONFIG_HDLC */
1758
1759/*
1760 * get async data from rx DMA buffers
1761 */
1762static void rx_async(struct slgt_info *info)
1763{
1764 struct mgsl_icount *icount = &info->icount;
1765 unsigned int start, end;
1766 unsigned char *p;
1767 unsigned char status;
1768 struct slgt_desc *bufs = info->rbufs;
1769 int i, count;
1770 int chars = 0;
1771 int stat;
1772 unsigned char ch;
1773
1774 start = end = info->rbuf_current;
1775
1776 while(desc_complete(bufs[end])) {
1777 count = desc_count(bufs[end]) - info->rbuf_index;
1778 p = bufs[end].buf + info->rbuf_index;
1779
1780 DBGISR(("%s rx_async count=%d\n", info->device_name, count));
1781 DBGDATA(info, p, count, "rx");
1782
1783 for(i=0 ; i < count; i+=2, p+=2) {
1784 ch = *p;
1785 icount->rx++;
1786
1787 stat = 0;
1788
1789 status = *(p + 1) & (BIT1 + BIT0);
1790 if (status) {
1791 if (status & BIT1)
1792 icount->parity++;
1793 else if (status & BIT0)
1794 icount->frame++;
1795 /* discard char if tty control flags say so */
1796 if (status & info->ignore_status_mask)
1797 continue;
1798 if (status & BIT1)
1799 stat = TTY_PARITY;
1800 else if (status & BIT0)
1801 stat = TTY_FRAME;
1802 }
1803 tty_insert_flip_char(&info->port, ch, stat);
1804 chars++;
1805 }
1806
1807 if (i < count) {
1808 /* receive buffer not completed */
1809 info->rbuf_index += i;
1810 mod_timer(&info->rx_timer, jiffies + 1);
1811 break;
1812 }
1813
1814 info->rbuf_index = 0;
1815 free_rbufs(info, end, end);
1816
1817 if (++end == info->rbuf_count)
1818 end = 0;
1819
1820 /* if entire list searched then no frame available */
1821 if (end == start)
1822 break;
1823 }
1824
1825 if (chars)
1826 tty_flip_buffer_push(&info->port);
1827}
1828
1829/*
1830 * return next bottom half action to perform
1831 */
1832static int bh_action(struct slgt_info *info)
1833{
1834 unsigned long flags;
1835 int rc;
1836
1837 spin_lock_irqsave(&info->lock,flags);
1838
1839 if (info->pending_bh & BH_RECEIVE) {
1840 info->pending_bh &= ~BH_RECEIVE;
1841 rc = BH_RECEIVE;
1842 } else if (info->pending_bh & BH_TRANSMIT) {
1843 info->pending_bh &= ~BH_TRANSMIT;
1844 rc = BH_TRANSMIT;
1845 } else if (info->pending_bh & BH_STATUS) {
1846 info->pending_bh &= ~BH_STATUS;
1847 rc = BH_STATUS;
1848 } else {
1849 /* Mark BH routine as complete */
1850 info->bh_running = false;
1851 info->bh_requested = false;
1852 rc = 0;
1853 }
1854
1855 spin_unlock_irqrestore(&info->lock,flags);
1856
1857 return rc;
1858}
1859
1860/*
1861 * perform bottom half processing
1862 */
1863static void bh_handler(struct work_struct *work)
1864{
1865 struct slgt_info *info = container_of(work, struct slgt_info, task);
1866 int action;
1867
1868 info->bh_running = true;
1869
1870 while((action = bh_action(info))) {
1871 switch (action) {
1872 case BH_RECEIVE:
1873 DBGBH(("%s bh receive\n", info->device_name));
1874 switch(info->params.mode) {
1875 case MGSL_MODE_ASYNC:
1876 rx_async(info);
1877 break;
1878 case MGSL_MODE_HDLC:
1879 while(rx_get_frame(info));
1880 break;
1881 case MGSL_MODE_RAW:
1882 case MGSL_MODE_MONOSYNC:
1883 case MGSL_MODE_BISYNC:
1884 case MGSL_MODE_XSYNC:
1885 while(rx_get_buf(info));
1886 break;
1887 }
1888 /* restart receiver if rx DMA buffers exhausted */
1889 if (info->rx_restart)
1890 rx_start(info);
1891 break;
1892 case BH_TRANSMIT:
1893 bh_transmit(info);
1894 break;
1895 case BH_STATUS:
1896 DBGBH(("%s bh status\n", info->device_name));
1897 info->ri_chkcount = 0;
1898 info->dsr_chkcount = 0;
1899 info->dcd_chkcount = 0;
1900 info->cts_chkcount = 0;
1901 break;
1902 default:
1903 DBGBH(("%s unknown action\n", info->device_name));
1904 break;
1905 }
1906 }
1907 DBGBH(("%s bh_handler exit\n", info->device_name));
1908}
1909
1910static void bh_transmit(struct slgt_info *info)
1911{
1912 struct tty_struct *tty = info->port.tty;
1913
1914 DBGBH(("%s bh_transmit\n", info->device_name));
1915 if (tty)
1916 tty_wakeup(tty);
1917}
1918
1919static void dsr_change(struct slgt_info *info, unsigned short status)
1920{
1921 if (status & BIT3) {
1922 info->signals |= SerialSignal_DSR;
1923 info->input_signal_events.dsr_up++;
1924 } else {
1925 info->signals &= ~SerialSignal_DSR;
1926 info->input_signal_events.dsr_down++;
1927 }
1928 DBGISR(("dsr_change %s signals=%04X\n", info->device_name, info->signals));
1929 if ((info->dsr_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1930 slgt_irq_off(info, IRQ_DSR);
1931 return;
1932 }
1933 info->icount.dsr++;
1934 wake_up_interruptible(&info->status_event_wait_q);
1935 wake_up_interruptible(&info->event_wait_q);
1936 info->pending_bh |= BH_STATUS;
1937}
1938
1939static void cts_change(struct slgt_info *info, unsigned short status)
1940{
1941 if (status & BIT2) {
1942 info->signals |= SerialSignal_CTS;
1943 info->input_signal_events.cts_up++;
1944 } else {
1945 info->signals &= ~SerialSignal_CTS;
1946 info->input_signal_events.cts_down++;
1947 }
1948 DBGISR(("cts_change %s signals=%04X\n", info->device_name, info->signals));
1949 if ((info->cts_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1950 slgt_irq_off(info, IRQ_CTS);
1951 return;
1952 }
1953 info->icount.cts++;
1954 wake_up_interruptible(&info->status_event_wait_q);
1955 wake_up_interruptible(&info->event_wait_q);
1956 info->pending_bh |= BH_STATUS;
1957
1958 if (tty_port_cts_enabled(&info->port)) {
1959 if (info->port.tty) {
1960 if (info->port.tty->hw_stopped) {
1961 if (info->signals & SerialSignal_CTS) {
1962 info->port.tty->hw_stopped = 0;
1963 info->pending_bh |= BH_TRANSMIT;
1964 return;
1965 }
1966 } else {
1967 if (!(info->signals & SerialSignal_CTS))
1968 info->port.tty->hw_stopped = 1;
1969 }
1970 }
1971 }
1972}
1973
1974static void dcd_change(struct slgt_info *info, unsigned short status)
1975{
1976 if (status & BIT1) {
1977 info->signals |= SerialSignal_DCD;
1978 info->input_signal_events.dcd_up++;
1979 } else {
1980 info->signals &= ~SerialSignal_DCD;
1981 info->input_signal_events.dcd_down++;
1982 }
1983 DBGISR(("dcd_change %s signals=%04X\n", info->device_name, info->signals));
1984 if ((info->dcd_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
1985 slgt_irq_off(info, IRQ_DCD);
1986 return;
1987 }
1988 info->icount.dcd++;
1989#if SYNCLINK_GENERIC_HDLC
1990 if (info->netcount) {
1991 if (info->signals & SerialSignal_DCD)
1992 netif_carrier_on(info->netdev);
1993 else
1994 netif_carrier_off(info->netdev);
1995 }
1996#endif
1997 wake_up_interruptible(&info->status_event_wait_q);
1998 wake_up_interruptible(&info->event_wait_q);
1999 info->pending_bh |= BH_STATUS;
2000
2001 if (tty_port_check_carrier(&info->port)) {
2002 if (info->signals & SerialSignal_DCD)
2003 wake_up_interruptible(&info->port.open_wait);
2004 else {
2005 if (info->port.tty)
2006 tty_hangup(info->port.tty);
2007 }
2008 }
2009}
2010
2011static void ri_change(struct slgt_info *info, unsigned short status)
2012{
2013 if (status & BIT0) {
2014 info->signals |= SerialSignal_RI;
2015 info->input_signal_events.ri_up++;
2016 } else {
2017 info->signals &= ~SerialSignal_RI;
2018 info->input_signal_events.ri_down++;
2019 }
2020 DBGISR(("ri_change %s signals=%04X\n", info->device_name, info->signals));
2021 if ((info->ri_chkcount)++ == IO_PIN_SHUTDOWN_LIMIT) {
2022 slgt_irq_off(info, IRQ_RI);
2023 return;
2024 }
2025 info->icount.rng++;
2026 wake_up_interruptible(&info->status_event_wait_q);
2027 wake_up_interruptible(&info->event_wait_q);
2028 info->pending_bh |= BH_STATUS;
2029}
2030
2031static void isr_rxdata(struct slgt_info *info)
2032{
2033 unsigned int count = info->rbuf_fill_count;
2034 unsigned int i = info->rbuf_fill_index;
2035 unsigned short reg;
2036
2037 while (rd_reg16(info, SSR) & IRQ_RXDATA) {
2038 reg = rd_reg16(info, RDR);
2039 DBGISR(("isr_rxdata %s RDR=%04X\n", info->device_name, reg));
2040 if (desc_complete(info->rbufs[i])) {
2041 /* all buffers full */
2042 rx_stop(info);
2043 info->rx_restart = true;
2044 continue;
2045 }
2046 info->rbufs[i].buf[count++] = (unsigned char)reg;
2047 /* async mode saves status byte to buffer for each data byte */
2048 if (info->params.mode == MGSL_MODE_ASYNC)
2049 info->rbufs[i].buf[count++] = (unsigned char)(reg >> 8);
2050 if (count == info->rbuf_fill_level || (reg & BIT10)) {
2051 /* buffer full or end of frame */
2052 set_desc_count(info->rbufs[i], count);
2053 set_desc_status(info->rbufs[i], BIT15 | (reg >> 8));
2054 info->rbuf_fill_count = count = 0;
2055 if (++i == info->rbuf_count)
2056 i = 0;
2057 info->pending_bh |= BH_RECEIVE;
2058 }
2059 }
2060
2061 info->rbuf_fill_index = i;
2062 info->rbuf_fill_count = count;
2063}
2064
2065static void isr_serial(struct slgt_info *info)
2066{
2067 unsigned short status = rd_reg16(info, SSR);
2068
2069 DBGISR(("%s isr_serial status=%04X\n", info->device_name, status));
2070
2071 wr_reg16(info, SSR, status); /* clear pending */
2072
2073 info->irq_occurred = true;
2074
2075 if (info->params.mode == MGSL_MODE_ASYNC) {
2076 if (status & IRQ_TXIDLE) {
2077 if (info->tx_active)
2078 isr_txeom(info, status);
2079 }
2080 if (info->rx_pio && (status & IRQ_RXDATA))
2081 isr_rxdata(info);
2082 if ((status & IRQ_RXBREAK) && (status & RXBREAK)) {
2083 info->icount.brk++;
2084 /* process break detection if tty control allows */
2085 if (info->port.tty) {
2086 if (!(status & info->ignore_status_mask)) {
2087 if (info->read_status_mask & MASK_BREAK) {
2088 tty_insert_flip_char(&info->port, 0, TTY_BREAK);
2089 if (info->port.flags & ASYNC_SAK)
2090 do_SAK(info->port.tty);
2091 }
2092 }
2093 }
2094 }
2095 } else {
2096 if (status & (IRQ_TXIDLE + IRQ_TXUNDER))
2097 isr_txeom(info, status);
2098 if (info->rx_pio && (status & IRQ_RXDATA))
2099 isr_rxdata(info);
2100 if (status & IRQ_RXIDLE) {
2101 if (status & RXIDLE)
2102 info->icount.rxidle++;
2103 else
2104 info->icount.exithunt++;
2105 wake_up_interruptible(&info->event_wait_q);
2106 }
2107
2108 if (status & IRQ_RXOVER)
2109 rx_start(info);
2110 }
2111
2112 if (status & IRQ_DSR)
2113 dsr_change(info, status);
2114 if (status & IRQ_CTS)
2115 cts_change(info, status);
2116 if (status & IRQ_DCD)
2117 dcd_change(info, status);
2118 if (status & IRQ_RI)
2119 ri_change(info, status);
2120}
2121
2122static void isr_rdma(struct slgt_info *info)
2123{
2124 unsigned int status = rd_reg32(info, RDCSR);
2125
2126 DBGISR(("%s isr_rdma status=%08x\n", info->device_name, status));
2127
2128 /* RDCSR (rx DMA control/status)
2129 *
2130 * 31..07 reserved
2131 * 06 save status byte to DMA buffer
2132 * 05 error
2133 * 04 eol (end of list)
2134 * 03 eob (end of buffer)
2135 * 02 IRQ enable
2136 * 01 reset
2137 * 00 enable
2138 */
2139 wr_reg32(info, RDCSR, status); /* clear pending */
2140
2141 if (status & (BIT5 + BIT4)) {
2142 DBGISR(("%s isr_rdma rx_restart=1\n", info->device_name));
2143 info->rx_restart = true;
2144 }
2145 info->pending_bh |= BH_RECEIVE;
2146}
2147
2148static void isr_tdma(struct slgt_info *info)
2149{
2150 unsigned int status = rd_reg32(info, TDCSR);
2151
2152 DBGISR(("%s isr_tdma status=%08x\n", info->device_name, status));
2153
2154 /* TDCSR (tx DMA control/status)
2155 *
2156 * 31..06 reserved
2157 * 05 error
2158 * 04 eol (end of list)
2159 * 03 eob (end of buffer)
2160 * 02 IRQ enable
2161 * 01 reset
2162 * 00 enable
2163 */
2164 wr_reg32(info, TDCSR, status); /* clear pending */
2165
2166 if (status & (BIT5 + BIT4 + BIT3)) {
2167 // another transmit buffer has completed
2168 // run bottom half to get more send data from user
2169 info->pending_bh |= BH_TRANSMIT;
2170 }
2171}
2172
2173/*
2174 * return true if there are unsent tx DMA buffers, otherwise false
2175 *
2176 * if there are unsent buffers then info->tbuf_start
2177 * is set to index of first unsent buffer
2178 */
2179static bool unsent_tbufs(struct slgt_info *info)
2180{
2181 unsigned int i = info->tbuf_current;
2182 bool rc = false;
2183
2184 /*
2185 * search backwards from last loaded buffer (precedes tbuf_current)
2186 * for first unsent buffer (desc_count > 0)
2187 */
2188
2189 do {
2190 if (i)
2191 i--;
2192 else
2193 i = info->tbuf_count - 1;
2194 if (!desc_count(info->tbufs[i]))
2195 break;
2196 info->tbuf_start = i;
2197 rc = true;
2198 } while (i != info->tbuf_current);
2199
2200 return rc;
2201}
2202
2203static void isr_txeom(struct slgt_info *info, unsigned short status)
2204{
2205 DBGISR(("%s txeom status=%04x\n", info->device_name, status));
2206
2207 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
2208 tdma_reset(info);
2209 if (status & IRQ_TXUNDER) {
2210 unsigned short val = rd_reg16(info, TCR);
2211 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
2212 wr_reg16(info, TCR, val); /* clear reset bit */
2213 }
2214
2215 if (info->tx_active) {
2216 if (info->params.mode != MGSL_MODE_ASYNC) {
2217 if (status & IRQ_TXUNDER)
2218 info->icount.txunder++;
2219 else if (status & IRQ_TXIDLE)
2220 info->icount.txok++;
2221 }
2222
2223 if (unsent_tbufs(info)) {
2224 tx_start(info);
2225 update_tx_timer(info);
2226 return;
2227 }
2228 info->tx_active = false;
2229
2230 del_timer(&info->tx_timer);
2231
2232 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done) {
2233 info->signals &= ~SerialSignal_RTS;
2234 info->drop_rts_on_tx_done = false;
2235 set_gtsignals(info);
2236 }
2237
2238#if SYNCLINK_GENERIC_HDLC
2239 if (info->netcount)
2240 hdlcdev_tx_done(info);
2241 else
2242#endif
2243 {
2244 if (info->port.tty && (info->port.tty->flow.stopped || info->port.tty->hw_stopped)) {
2245 tx_stop(info);
2246 return;
2247 }
2248 info->pending_bh |= BH_TRANSMIT;
2249 }
2250 }
2251}
2252
2253static void isr_gpio(struct slgt_info *info, unsigned int changed, unsigned int state)
2254{
2255 struct cond_wait *w, *prev;
2256
2257 /* wake processes waiting for specific transitions */
2258 for (w = info->gpio_wait_q, prev = NULL ; w != NULL ; w = w->next) {
2259 if (w->data & changed) {
2260 w->data = state;
2261 wake_up_interruptible(&w->q);
2262 if (prev != NULL)
2263 prev->next = w->next;
2264 else
2265 info->gpio_wait_q = w->next;
2266 } else
2267 prev = w;
2268 }
2269}
2270
2271/* interrupt service routine
2272 *
2273 * irq interrupt number
2274 * dev_id device ID supplied during interrupt registration
2275 */
2276static irqreturn_t slgt_interrupt(int dummy, void *dev_id)
2277{
2278 struct slgt_info *info = dev_id;
2279 unsigned int gsr;
2280 unsigned int i;
2281
2282 DBGISR(("slgt_interrupt irq=%d entry\n", info->irq_level));
2283
2284 while((gsr = rd_reg32(info, GSR) & 0xffffff00)) {
2285 DBGISR(("%s gsr=%08x\n", info->device_name, gsr));
2286 info->irq_occurred = true;
2287 for(i=0; i < info->port_count ; i++) {
2288 if (info->port_array[i] == NULL)
2289 continue;
2290 spin_lock(&info->port_array[i]->lock);
2291 if (gsr & (BIT8 << i))
2292 isr_serial(info->port_array[i]);
2293 if (gsr & (BIT16 << (i*2)))
2294 isr_rdma(info->port_array[i]);
2295 if (gsr & (BIT17 << (i*2)))
2296 isr_tdma(info->port_array[i]);
2297 spin_unlock(&info->port_array[i]->lock);
2298 }
2299 }
2300
2301 if (info->gpio_present) {
2302 unsigned int state;
2303 unsigned int changed;
2304 spin_lock(&info->lock);
2305 while ((changed = rd_reg32(info, IOSR)) != 0) {
2306 DBGISR(("%s iosr=%08x\n", info->device_name, changed));
2307 /* read latched state of GPIO signals */
2308 state = rd_reg32(info, IOVR);
2309 /* clear pending GPIO interrupt bits */
2310 wr_reg32(info, IOSR, changed);
2311 for (i=0 ; i < info->port_count ; i++) {
2312 if (info->port_array[i] != NULL)
2313 isr_gpio(info->port_array[i], changed, state);
2314 }
2315 }
2316 spin_unlock(&info->lock);
2317 }
2318
2319 for(i=0; i < info->port_count ; i++) {
2320 struct slgt_info *port = info->port_array[i];
2321 if (port == NULL)
2322 continue;
2323 spin_lock(&port->lock);
2324 if ((port->port.count || port->netcount) &&
2325 port->pending_bh && !port->bh_running &&
2326 !port->bh_requested) {
2327 DBGISR(("%s bh queued\n", port->device_name));
2328 schedule_work(&port->task);
2329 port->bh_requested = true;
2330 }
2331 spin_unlock(&port->lock);
2332 }
2333
2334 DBGISR(("slgt_interrupt irq=%d exit\n", info->irq_level));
2335 return IRQ_HANDLED;
2336}
2337
2338static int startup(struct slgt_info *info)
2339{
2340 DBGINFO(("%s startup\n", info->device_name));
2341
2342 if (tty_port_initialized(&info->port))
2343 return 0;
2344
2345 if (!info->tx_buf) {
2346 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2347 if (!info->tx_buf) {
2348 DBGERR(("%s can't allocate tx buffer\n", info->device_name));
2349 return -ENOMEM;
2350 }
2351 }
2352
2353 info->pending_bh = 0;
2354
2355 memset(&info->icount, 0, sizeof(info->icount));
2356
2357 /* program hardware for current parameters */
2358 change_params(info);
2359
2360 if (info->port.tty)
2361 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
2362
2363 tty_port_set_initialized(&info->port, 1);
2364
2365 return 0;
2366}
2367
2368/*
2369 * called by close() and hangup() to shutdown hardware
2370 */
2371static void shutdown(struct slgt_info *info)
2372{
2373 unsigned long flags;
2374
2375 if (!tty_port_initialized(&info->port))
2376 return;
2377
2378 DBGINFO(("%s shutdown\n", info->device_name));
2379
2380 /* clear status wait queue because status changes */
2381 /* can't happen after shutting down the hardware */
2382 wake_up_interruptible(&info->status_event_wait_q);
2383 wake_up_interruptible(&info->event_wait_q);
2384
2385 del_timer_sync(&info->tx_timer);
2386 del_timer_sync(&info->rx_timer);
2387
2388 kfree(info->tx_buf);
2389 info->tx_buf = NULL;
2390
2391 spin_lock_irqsave(&info->lock,flags);
2392
2393 tx_stop(info);
2394 rx_stop(info);
2395
2396 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
2397
2398 if (!info->port.tty || info->port.tty->termios.c_cflag & HUPCL) {
2399 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2400 set_gtsignals(info);
2401 }
2402
2403 flush_cond_wait(&info->gpio_wait_q);
2404
2405 spin_unlock_irqrestore(&info->lock,flags);
2406
2407 if (info->port.tty)
2408 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
2409
2410 tty_port_set_initialized(&info->port, 0);
2411}
2412
2413static void program_hw(struct slgt_info *info)
2414{
2415 unsigned long flags;
2416
2417 spin_lock_irqsave(&info->lock,flags);
2418
2419 rx_stop(info);
2420 tx_stop(info);
2421
2422 if (info->params.mode != MGSL_MODE_ASYNC ||
2423 info->netcount)
2424 sync_mode(info);
2425 else
2426 async_mode(info);
2427
2428 set_gtsignals(info);
2429
2430 info->dcd_chkcount = 0;
2431 info->cts_chkcount = 0;
2432 info->ri_chkcount = 0;
2433 info->dsr_chkcount = 0;
2434
2435 slgt_irq_on(info, IRQ_DCD | IRQ_CTS | IRQ_DSR | IRQ_RI);
2436 get_gtsignals(info);
2437
2438 if (info->netcount ||
2439 (info->port.tty && info->port.tty->termios.c_cflag & CREAD))
2440 rx_start(info);
2441
2442 spin_unlock_irqrestore(&info->lock,flags);
2443}
2444
2445/*
2446 * reconfigure adapter based on new parameters
2447 */
2448static void change_params(struct slgt_info *info)
2449{
2450 unsigned cflag;
2451 int bits_per_char;
2452
2453 if (!info->port.tty)
2454 return;
2455 DBGINFO(("%s change_params\n", info->device_name));
2456
2457 cflag = info->port.tty->termios.c_cflag;
2458
2459 /* if B0 rate (hangup) specified then negate RTS and DTR */
2460 /* otherwise assert RTS and DTR */
2461 if (cflag & CBAUD)
2462 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
2463 else
2464 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
2465
2466 /* byte size and parity */
2467
2468 info->params.data_bits = tty_get_char_size(cflag);
2469 info->params.stop_bits = (cflag & CSTOPB) ? 2 : 1;
2470
2471 if (cflag & PARENB)
2472 info->params.parity = (cflag & PARODD) ? ASYNC_PARITY_ODD : ASYNC_PARITY_EVEN;
2473 else
2474 info->params.parity = ASYNC_PARITY_NONE;
2475
2476 /* calculate number of jiffies to transmit a full
2477 * FIFO (32 bytes) at specified data rate
2478 */
2479 bits_per_char = info->params.data_bits +
2480 info->params.stop_bits + 1;
2481
2482 info->params.data_rate = tty_get_baud_rate(info->port.tty);
2483
2484 if (info->params.data_rate) {
2485 info->timeout = (32*HZ*bits_per_char) /
2486 info->params.data_rate;
2487 }
2488 info->timeout += HZ/50; /* Add .02 seconds of slop */
2489
2490 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
2491 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
2492
2493 /* process tty input control flags */
2494
2495 info->read_status_mask = IRQ_RXOVER;
2496 if (I_INPCK(info->port.tty))
2497 info->read_status_mask |= MASK_PARITY | MASK_FRAMING;
2498 if (I_BRKINT(info->port.tty) || I_PARMRK(info->port.tty))
2499 info->read_status_mask |= MASK_BREAK;
2500 if (I_IGNPAR(info->port.tty))
2501 info->ignore_status_mask |= MASK_PARITY | MASK_FRAMING;
2502 if (I_IGNBRK(info->port.tty)) {
2503 info->ignore_status_mask |= MASK_BREAK;
2504 /* If ignoring parity and break indicators, ignore
2505 * overruns too. (For real raw support).
2506 */
2507 if (I_IGNPAR(info->port.tty))
2508 info->ignore_status_mask |= MASK_OVERRUN;
2509 }
2510
2511 program_hw(info);
2512}
2513
2514static int get_stats(struct slgt_info *info, struct mgsl_icount __user *user_icount)
2515{
2516 DBGINFO(("%s get_stats\n", info->device_name));
2517 if (!user_icount) {
2518 memset(&info->icount, 0, sizeof(info->icount));
2519 } else {
2520 if (copy_to_user(user_icount, &info->icount, sizeof(struct mgsl_icount)))
2521 return -EFAULT;
2522 }
2523 return 0;
2524}
2525
2526static int get_params(struct slgt_info *info, MGSL_PARAMS __user *user_params)
2527{
2528 DBGINFO(("%s get_params\n", info->device_name));
2529 if (copy_to_user(user_params, &info->params, sizeof(MGSL_PARAMS)))
2530 return -EFAULT;
2531 return 0;
2532}
2533
2534static int set_params(struct slgt_info *info, MGSL_PARAMS __user *new_params)
2535{
2536 unsigned long flags;
2537 MGSL_PARAMS tmp_params;
2538
2539 DBGINFO(("%s set_params\n", info->device_name));
2540 if (copy_from_user(&tmp_params, new_params, sizeof(MGSL_PARAMS)))
2541 return -EFAULT;
2542
2543 spin_lock_irqsave(&info->lock, flags);
2544 if (tmp_params.mode == MGSL_MODE_BASE_CLOCK)
2545 info->base_clock = tmp_params.clock_speed;
2546 else
2547 memcpy(&info->params, &tmp_params, sizeof(MGSL_PARAMS));
2548 spin_unlock_irqrestore(&info->lock, flags);
2549
2550 program_hw(info);
2551
2552 return 0;
2553}
2554
2555static int get_txidle(struct slgt_info *info, int __user *idle_mode)
2556{
2557 DBGINFO(("%s get_txidle=%d\n", info->device_name, info->idle_mode));
2558 if (put_user(info->idle_mode, idle_mode))
2559 return -EFAULT;
2560 return 0;
2561}
2562
2563static int set_txidle(struct slgt_info *info, int idle_mode)
2564{
2565 unsigned long flags;
2566 DBGINFO(("%s set_txidle(%d)\n", info->device_name, idle_mode));
2567 spin_lock_irqsave(&info->lock,flags);
2568 info->idle_mode = idle_mode;
2569 if (info->params.mode != MGSL_MODE_ASYNC)
2570 tx_set_idle(info);
2571 spin_unlock_irqrestore(&info->lock,flags);
2572 return 0;
2573}
2574
2575static int tx_enable(struct slgt_info *info, int enable)
2576{
2577 unsigned long flags;
2578 DBGINFO(("%s tx_enable(%d)\n", info->device_name, enable));
2579 spin_lock_irqsave(&info->lock,flags);
2580 if (enable) {
2581 if (!info->tx_enabled)
2582 tx_start(info);
2583 } else {
2584 if (info->tx_enabled)
2585 tx_stop(info);
2586 }
2587 spin_unlock_irqrestore(&info->lock,flags);
2588 return 0;
2589}
2590
2591/*
2592 * abort transmit HDLC frame
2593 */
2594static int tx_abort(struct slgt_info *info)
2595{
2596 unsigned long flags;
2597 DBGINFO(("%s tx_abort\n", info->device_name));
2598 spin_lock_irqsave(&info->lock,flags);
2599 tdma_reset(info);
2600 spin_unlock_irqrestore(&info->lock,flags);
2601 return 0;
2602}
2603
2604static int rx_enable(struct slgt_info *info, int enable)
2605{
2606 unsigned long flags;
2607 unsigned int rbuf_fill_level;
2608 DBGINFO(("%s rx_enable(%08x)\n", info->device_name, enable));
2609 spin_lock_irqsave(&info->lock,flags);
2610 /*
2611 * enable[31..16] = receive DMA buffer fill level
2612 * 0 = noop (leave fill level unchanged)
2613 * fill level must be multiple of 4 and <= buffer size
2614 */
2615 rbuf_fill_level = ((unsigned int)enable) >> 16;
2616 if (rbuf_fill_level) {
2617 if ((rbuf_fill_level > DMABUFSIZE) || (rbuf_fill_level % 4)) {
2618 spin_unlock_irqrestore(&info->lock, flags);
2619 return -EINVAL;
2620 }
2621 info->rbuf_fill_level = rbuf_fill_level;
2622 if (rbuf_fill_level < 128)
2623 info->rx_pio = 1; /* PIO mode */
2624 else
2625 info->rx_pio = 0; /* DMA mode */
2626 rx_stop(info); /* restart receiver to use new fill level */
2627 }
2628
2629 /*
2630 * enable[1..0] = receiver enable command
2631 * 0 = disable
2632 * 1 = enable
2633 * 2 = enable or force hunt mode if already enabled
2634 */
2635 enable &= 3;
2636 if (enable) {
2637 if (!info->rx_enabled)
2638 rx_start(info);
2639 else if (enable == 2) {
2640 /* force hunt mode (write 1 to RCR[3]) */
2641 wr_reg16(info, RCR, rd_reg16(info, RCR) | BIT3);
2642 }
2643 } else {
2644 if (info->rx_enabled)
2645 rx_stop(info);
2646 }
2647 spin_unlock_irqrestore(&info->lock,flags);
2648 return 0;
2649}
2650
2651/*
2652 * wait for specified event to occur
2653 */
2654static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr)
2655{
2656 unsigned long flags;
2657 int s;
2658 int rc=0;
2659 struct mgsl_icount cprev, cnow;
2660 int events;
2661 int mask;
2662 struct _input_signal_events oldsigs, newsigs;
2663 DECLARE_WAITQUEUE(wait, current);
2664
2665 if (get_user(mask, mask_ptr))
2666 return -EFAULT;
2667
2668 DBGINFO(("%s wait_mgsl_event(%d)\n", info->device_name, mask));
2669
2670 spin_lock_irqsave(&info->lock,flags);
2671
2672 /* return immediately if state matches requested events */
2673 get_gtsignals(info);
2674 s = info->signals;
2675
2676 events = mask &
2677 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
2678 ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
2679 ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
2680 ((s & SerialSignal_RI) ? MgslEvent_RiActive :MgslEvent_RiInactive) );
2681 if (events) {
2682 spin_unlock_irqrestore(&info->lock,flags);
2683 goto exit;
2684 }
2685
2686 /* save current irq counts */
2687 cprev = info->icount;
2688 oldsigs = info->input_signal_events;
2689
2690 /* enable hunt and idle irqs if needed */
2691 if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
2692 unsigned short val = rd_reg16(info, SCR);
2693 if (!(val & IRQ_RXIDLE))
2694 wr_reg16(info, SCR, (unsigned short)(val | IRQ_RXIDLE));
2695 }
2696
2697 set_current_state(TASK_INTERRUPTIBLE);
2698 add_wait_queue(&info->event_wait_q, &wait);
2699
2700 spin_unlock_irqrestore(&info->lock,flags);
2701
2702 for(;;) {
2703 schedule();
2704 if (signal_pending(current)) {
2705 rc = -ERESTARTSYS;
2706 break;
2707 }
2708
2709 /* get current irq counts */
2710 spin_lock_irqsave(&info->lock,flags);
2711 cnow = info->icount;
2712 newsigs = info->input_signal_events;
2713 set_current_state(TASK_INTERRUPTIBLE);
2714 spin_unlock_irqrestore(&info->lock,flags);
2715
2716 /* if no change, wait aborted for some reason */
2717 if (newsigs.dsr_up == oldsigs.dsr_up &&
2718 newsigs.dsr_down == oldsigs.dsr_down &&
2719 newsigs.dcd_up == oldsigs.dcd_up &&
2720 newsigs.dcd_down == oldsigs.dcd_down &&
2721 newsigs.cts_up == oldsigs.cts_up &&
2722 newsigs.cts_down == oldsigs.cts_down &&
2723 newsigs.ri_up == oldsigs.ri_up &&
2724 newsigs.ri_down == oldsigs.ri_down &&
2725 cnow.exithunt == cprev.exithunt &&
2726 cnow.rxidle == cprev.rxidle) {
2727 rc = -EIO;
2728 break;
2729 }
2730
2731 events = mask &
2732 ( (newsigs.dsr_up != oldsigs.dsr_up ? MgslEvent_DsrActive:0) +
2733 (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
2734 (newsigs.dcd_up != oldsigs.dcd_up ? MgslEvent_DcdActive:0) +
2735 (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
2736 (newsigs.cts_up != oldsigs.cts_up ? MgslEvent_CtsActive:0) +
2737 (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
2738 (newsigs.ri_up != oldsigs.ri_up ? MgslEvent_RiActive:0) +
2739 (newsigs.ri_down != oldsigs.ri_down ? MgslEvent_RiInactive:0) +
2740 (cnow.exithunt != cprev.exithunt ? MgslEvent_ExitHuntMode:0) +
2741 (cnow.rxidle != cprev.rxidle ? MgslEvent_IdleReceived:0) );
2742 if (events)
2743 break;
2744
2745 cprev = cnow;
2746 oldsigs = newsigs;
2747 }
2748
2749 remove_wait_queue(&info->event_wait_q, &wait);
2750 set_current_state(TASK_RUNNING);
2751
2752
2753 if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
2754 spin_lock_irqsave(&info->lock,flags);
2755 if (!waitqueue_active(&info->event_wait_q)) {
2756 /* disable enable exit hunt mode/idle rcvd IRQs */
2757 wr_reg16(info, SCR,
2758 (unsigned short)(rd_reg16(info, SCR) & ~IRQ_RXIDLE));
2759 }
2760 spin_unlock_irqrestore(&info->lock,flags);
2761 }
2762exit:
2763 if (rc == 0)
2764 rc = put_user(events, mask_ptr);
2765 return rc;
2766}
2767
2768static int get_interface(struct slgt_info *info, int __user *if_mode)
2769{
2770 DBGINFO(("%s get_interface=%x\n", info->device_name, info->if_mode));
2771 if (put_user(info->if_mode, if_mode))
2772 return -EFAULT;
2773 return 0;
2774}
2775
2776static int set_interface(struct slgt_info *info, int if_mode)
2777{
2778 unsigned long flags;
2779 unsigned short val;
2780
2781 DBGINFO(("%s set_interface=%x)\n", info->device_name, if_mode));
2782 spin_lock_irqsave(&info->lock,flags);
2783 info->if_mode = if_mode;
2784
2785 msc_set_vcr(info);
2786
2787 /* TCR (tx control) 07 1=RTS driver control */
2788 val = rd_reg16(info, TCR);
2789 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
2790 val |= BIT7;
2791 else
2792 val &= ~BIT7;
2793 wr_reg16(info, TCR, val);
2794
2795 spin_unlock_irqrestore(&info->lock,flags);
2796 return 0;
2797}
2798
2799static int get_xsync(struct slgt_info *info, int __user *xsync)
2800{
2801 DBGINFO(("%s get_xsync=%x\n", info->device_name, info->xsync));
2802 if (put_user(info->xsync, xsync))
2803 return -EFAULT;
2804 return 0;
2805}
2806
2807/*
2808 * set extended sync pattern (1 to 4 bytes) for extended sync mode
2809 *
2810 * sync pattern is contained in least significant bytes of value
2811 * most significant byte of sync pattern is oldest (1st sent/detected)
2812 */
2813static int set_xsync(struct slgt_info *info, int xsync)
2814{
2815 unsigned long flags;
2816
2817 DBGINFO(("%s set_xsync=%x)\n", info->device_name, xsync));
2818 spin_lock_irqsave(&info->lock, flags);
2819 info->xsync = xsync;
2820 wr_reg32(info, XSR, xsync);
2821 spin_unlock_irqrestore(&info->lock, flags);
2822 return 0;
2823}
2824
2825static int get_xctrl(struct slgt_info *info, int __user *xctrl)
2826{
2827 DBGINFO(("%s get_xctrl=%x\n", info->device_name, info->xctrl));
2828 if (put_user(info->xctrl, xctrl))
2829 return -EFAULT;
2830 return 0;
2831}
2832
2833/*
2834 * set extended control options
2835 *
2836 * xctrl[31:19] reserved, must be zero
2837 * xctrl[18:17] extended sync pattern length in bytes
2838 * 00 = 1 byte in xsr[7:0]
2839 * 01 = 2 bytes in xsr[15:0]
2840 * 10 = 3 bytes in xsr[23:0]
2841 * 11 = 4 bytes in xsr[31:0]
2842 * xctrl[16] 1 = enable terminal count, 0=disabled
2843 * xctrl[15:0] receive terminal count for fixed length packets
2844 * value is count minus one (0 = 1 byte packet)
2845 * when terminal count is reached, receiver
2846 * automatically returns to hunt mode and receive
2847 * FIFO contents are flushed to DMA buffers with
2848 * end of frame (EOF) status
2849 */
2850static int set_xctrl(struct slgt_info *info, int xctrl)
2851{
2852 unsigned long flags;
2853
2854 DBGINFO(("%s set_xctrl=%x)\n", info->device_name, xctrl));
2855 spin_lock_irqsave(&info->lock, flags);
2856 info->xctrl = xctrl;
2857 wr_reg32(info, XCR, xctrl);
2858 spin_unlock_irqrestore(&info->lock, flags);
2859 return 0;
2860}
2861
2862/*
2863 * set general purpose IO pin state and direction
2864 *
2865 * user_gpio fields:
2866 * state each bit indicates a pin state
2867 * smask set bit indicates pin state to set
2868 * dir each bit indicates a pin direction (0=input, 1=output)
2869 * dmask set bit indicates pin direction to set
2870 */
2871static int set_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2872{
2873 unsigned long flags;
2874 struct gpio_desc gpio;
2875 __u32 data;
2876
2877 if (!info->gpio_present)
2878 return -EINVAL;
2879 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2880 return -EFAULT;
2881 DBGINFO(("%s set_gpio state=%08x smask=%08x dir=%08x dmask=%08x\n",
2882 info->device_name, gpio.state, gpio.smask,
2883 gpio.dir, gpio.dmask));
2884
2885 spin_lock_irqsave(&info->port_array[0]->lock, flags);
2886 if (gpio.dmask) {
2887 data = rd_reg32(info, IODR);
2888 data |= gpio.dmask & gpio.dir;
2889 data &= ~(gpio.dmask & ~gpio.dir);
2890 wr_reg32(info, IODR, data);
2891 }
2892 if (gpio.smask) {
2893 data = rd_reg32(info, IOVR);
2894 data |= gpio.smask & gpio.state;
2895 data &= ~(gpio.smask & ~gpio.state);
2896 wr_reg32(info, IOVR, data);
2897 }
2898 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
2899
2900 return 0;
2901}
2902
2903/*
2904 * get general purpose IO pin state and direction
2905 */
2906static int get_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2907{
2908 struct gpio_desc gpio;
2909 if (!info->gpio_present)
2910 return -EINVAL;
2911 gpio.state = rd_reg32(info, IOVR);
2912 gpio.smask = 0xffffffff;
2913 gpio.dir = rd_reg32(info, IODR);
2914 gpio.dmask = 0xffffffff;
2915 if (copy_to_user(user_gpio, &gpio, sizeof(gpio)))
2916 return -EFAULT;
2917 DBGINFO(("%s get_gpio state=%08x dir=%08x\n",
2918 info->device_name, gpio.state, gpio.dir));
2919 return 0;
2920}
2921
2922/*
2923 * conditional wait facility
2924 */
2925static void init_cond_wait(struct cond_wait *w, unsigned int data)
2926{
2927 init_waitqueue_head(&w->q);
2928 init_waitqueue_entry(&w->wait, current);
2929 w->data = data;
2930}
2931
2932static void add_cond_wait(struct cond_wait **head, struct cond_wait *w)
2933{
2934 set_current_state(TASK_INTERRUPTIBLE);
2935 add_wait_queue(&w->q, &w->wait);
2936 w->next = *head;
2937 *head = w;
2938}
2939
2940static void remove_cond_wait(struct cond_wait **head, struct cond_wait *cw)
2941{
2942 struct cond_wait *w, *prev;
2943 remove_wait_queue(&cw->q, &cw->wait);
2944 set_current_state(TASK_RUNNING);
2945 for (w = *head, prev = NULL ; w != NULL ; prev = w, w = w->next) {
2946 if (w == cw) {
2947 if (prev != NULL)
2948 prev->next = w->next;
2949 else
2950 *head = w->next;
2951 break;
2952 }
2953 }
2954}
2955
2956static void flush_cond_wait(struct cond_wait **head)
2957{
2958 while (*head != NULL) {
2959 wake_up_interruptible(&(*head)->q);
2960 *head = (*head)->next;
2961 }
2962}
2963
2964/*
2965 * wait for general purpose I/O pin(s) to enter specified state
2966 *
2967 * user_gpio fields:
2968 * state - bit indicates target pin state
2969 * smask - set bit indicates watched pin
2970 *
2971 * The wait ends when at least one watched pin enters the specified
2972 * state. When 0 (no error) is returned, user_gpio->state is set to the
2973 * state of all GPIO pins when the wait ends.
2974 *
2975 * Note: Each pin may be a dedicated input, dedicated output, or
2976 * configurable input/output. The number and configuration of pins
2977 * varies with the specific adapter model. Only input pins (dedicated
2978 * or configured) can be monitored with this function.
2979 */
2980static int wait_gpio(struct slgt_info *info, struct gpio_desc __user *user_gpio)
2981{
2982 unsigned long flags;
2983 int rc = 0;
2984 struct gpio_desc gpio;
2985 struct cond_wait wait;
2986 u32 state;
2987
2988 if (!info->gpio_present)
2989 return -EINVAL;
2990 if (copy_from_user(&gpio, user_gpio, sizeof(gpio)))
2991 return -EFAULT;
2992 DBGINFO(("%s wait_gpio() state=%08x smask=%08x\n",
2993 info->device_name, gpio.state, gpio.smask));
2994 /* ignore output pins identified by set IODR bit */
2995 if ((gpio.smask &= ~rd_reg32(info, IODR)) == 0)
2996 return -EINVAL;
2997 init_cond_wait(&wait, gpio.smask);
2998
2999 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3000 /* enable interrupts for watched pins */
3001 wr_reg32(info, IOER, rd_reg32(info, IOER) | gpio.smask);
3002 /* get current pin states */
3003 state = rd_reg32(info, IOVR);
3004
3005 if (gpio.smask & ~(state ^ gpio.state)) {
3006 /* already in target state */
3007 gpio.state = state;
3008 } else {
3009 /* wait for target state */
3010 add_cond_wait(&info->gpio_wait_q, &wait);
3011 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3012 schedule();
3013 if (signal_pending(current))
3014 rc = -ERESTARTSYS;
3015 else
3016 gpio.state = wait.data;
3017 spin_lock_irqsave(&info->port_array[0]->lock, flags);
3018 remove_cond_wait(&info->gpio_wait_q, &wait);
3019 }
3020
3021 /* disable all GPIO interrupts if no waiting processes */
3022 if (info->gpio_wait_q == NULL)
3023 wr_reg32(info, IOER, 0);
3024 spin_unlock_irqrestore(&info->port_array[0]->lock, flags);
3025
3026 if ((rc == 0) && copy_to_user(user_gpio, &gpio, sizeof(gpio)))
3027 rc = -EFAULT;
3028 return rc;
3029}
3030
3031static int modem_input_wait(struct slgt_info *info,int arg)
3032{
3033 unsigned long flags;
3034 int rc;
3035 struct mgsl_icount cprev, cnow;
3036 DECLARE_WAITQUEUE(wait, current);
3037
3038 /* save current irq counts */
3039 spin_lock_irqsave(&info->lock,flags);
3040 cprev = info->icount;
3041 add_wait_queue(&info->status_event_wait_q, &wait);
3042 set_current_state(TASK_INTERRUPTIBLE);
3043 spin_unlock_irqrestore(&info->lock,flags);
3044
3045 for(;;) {
3046 schedule();
3047 if (signal_pending(current)) {
3048 rc = -ERESTARTSYS;
3049 break;
3050 }
3051
3052 /* get new irq counts */
3053 spin_lock_irqsave(&info->lock,flags);
3054 cnow = info->icount;
3055 set_current_state(TASK_INTERRUPTIBLE);
3056 spin_unlock_irqrestore(&info->lock,flags);
3057
3058 /* if no change, wait aborted for some reason */
3059 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3060 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3061 rc = -EIO;
3062 break;
3063 }
3064
3065 /* check for change in caller specified modem input */
3066 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3067 (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3068 (arg & TIOCM_CD && cnow.dcd != cprev.dcd) ||
3069 (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3070 rc = 0;
3071 break;
3072 }
3073
3074 cprev = cnow;
3075 }
3076 remove_wait_queue(&info->status_event_wait_q, &wait);
3077 set_current_state(TASK_RUNNING);
3078 return rc;
3079}
3080
3081/*
3082 * return state of serial control and status signals
3083 */
3084static int tiocmget(struct tty_struct *tty)
3085{
3086 struct slgt_info *info = tty->driver_data;
3087 unsigned int result;
3088 unsigned long flags;
3089
3090 spin_lock_irqsave(&info->lock,flags);
3091 get_gtsignals(info);
3092 spin_unlock_irqrestore(&info->lock,flags);
3093
3094 result = ((info->signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3095 ((info->signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3096 ((info->signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3097 ((info->signals & SerialSignal_RI) ? TIOCM_RNG:0) +
3098 ((info->signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3099 ((info->signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3100
3101 DBGINFO(("%s tiocmget value=%08X\n", info->device_name, result));
3102 return result;
3103}
3104
3105/*
3106 * set modem control signals (DTR/RTS)
3107 *
3108 * cmd signal command: TIOCMBIS = set bit TIOCMBIC = clear bit
3109 * TIOCMSET = set/clear signal values
3110 * value bit mask for command
3111 */
3112static int tiocmset(struct tty_struct *tty,
3113 unsigned int set, unsigned int clear)
3114{
3115 struct slgt_info *info = tty->driver_data;
3116 unsigned long flags;
3117
3118 DBGINFO(("%s tiocmset(%x,%x)\n", info->device_name, set, clear));
3119
3120 if (set & TIOCM_RTS)
3121 info->signals |= SerialSignal_RTS;
3122 if (set & TIOCM_DTR)
3123 info->signals |= SerialSignal_DTR;
3124 if (clear & TIOCM_RTS)
3125 info->signals &= ~SerialSignal_RTS;
3126 if (clear & TIOCM_DTR)
3127 info->signals &= ~SerialSignal_DTR;
3128
3129 spin_lock_irqsave(&info->lock,flags);
3130 set_gtsignals(info);
3131 spin_unlock_irqrestore(&info->lock,flags);
3132 return 0;
3133}
3134
3135static int carrier_raised(struct tty_port *port)
3136{
3137 unsigned long flags;
3138 struct slgt_info *info = container_of(port, struct slgt_info, port);
3139
3140 spin_lock_irqsave(&info->lock,flags);
3141 get_gtsignals(info);
3142 spin_unlock_irqrestore(&info->lock,flags);
3143 return (info->signals & SerialSignal_DCD) ? 1 : 0;
3144}
3145
3146static void dtr_rts(struct tty_port *port, int on)
3147{
3148 unsigned long flags;
3149 struct slgt_info *info = container_of(port, struct slgt_info, port);
3150
3151 spin_lock_irqsave(&info->lock,flags);
3152 if (on)
3153 info->signals |= SerialSignal_RTS | SerialSignal_DTR;
3154 else
3155 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
3156 set_gtsignals(info);
3157 spin_unlock_irqrestore(&info->lock,flags);
3158}
3159
3160
3161/*
3162 * block current process until the device is ready to open
3163 */
3164static int block_til_ready(struct tty_struct *tty, struct file *filp,
3165 struct slgt_info *info)
3166{
3167 DECLARE_WAITQUEUE(wait, current);
3168 int retval;
3169 bool do_clocal = false;
3170 unsigned long flags;
3171 int cd;
3172 struct tty_port *port = &info->port;
3173
3174 DBGINFO(("%s block_til_ready\n", tty->driver->name));
3175
3176 if (filp->f_flags & O_NONBLOCK || tty_io_error(tty)) {
3177 /* nonblock mode is set or port is not enabled */
3178 tty_port_set_active(port, 1);
3179 return 0;
3180 }
3181
3182 if (C_CLOCAL(tty))
3183 do_clocal = true;
3184
3185 /* Wait for carrier detect and the line to become
3186 * free (i.e., not in use by the callout). While we are in
3187 * this loop, port->count is dropped by one, so that
3188 * close() knows when to free things. We restore it upon
3189 * exit, either normal or abnormal.
3190 */
3191
3192 retval = 0;
3193 add_wait_queue(&port->open_wait, &wait);
3194
3195 spin_lock_irqsave(&info->lock, flags);
3196 port->count--;
3197 spin_unlock_irqrestore(&info->lock, flags);
3198 port->blocked_open++;
3199
3200 while (1) {
3201 if (C_BAUD(tty) && tty_port_initialized(port))
3202 tty_port_raise_dtr_rts(port);
3203
3204 set_current_state(TASK_INTERRUPTIBLE);
3205
3206 if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
3207 retval = (port->flags & ASYNC_HUP_NOTIFY) ?
3208 -EAGAIN : -ERESTARTSYS;
3209 break;
3210 }
3211
3212 cd = tty_port_carrier_raised(port);
3213 if (do_clocal || cd)
3214 break;
3215
3216 if (signal_pending(current)) {
3217 retval = -ERESTARTSYS;
3218 break;
3219 }
3220
3221 DBGINFO(("%s block_til_ready wait\n", tty->driver->name));
3222 tty_unlock(tty);
3223 schedule();
3224 tty_lock(tty);
3225 }
3226
3227 set_current_state(TASK_RUNNING);
3228 remove_wait_queue(&port->open_wait, &wait);
3229
3230 if (!tty_hung_up_p(filp))
3231 port->count++;
3232 port->blocked_open--;
3233
3234 if (!retval)
3235 tty_port_set_active(port, 1);
3236
3237 DBGINFO(("%s block_til_ready ready, rc=%d\n", tty->driver->name, retval));
3238 return retval;
3239}
3240
3241/*
3242 * allocate buffers used for calling line discipline receive_buf
3243 * directly in synchronous mode
3244 * note: add 5 bytes to max frame size to allow appending
3245 * 32-bit CRC and status byte when configured to do so
3246 */
3247static int alloc_tmp_rbuf(struct slgt_info *info)
3248{
3249 info->tmp_rbuf = kmalloc(info->max_frame_size + 5, GFP_KERNEL);
3250 if (info->tmp_rbuf == NULL)
3251 return -ENOMEM;
3252 /* unused flag buffer to satisfy receive_buf calling interface */
3253 info->flag_buf = kzalloc(info->max_frame_size + 5, GFP_KERNEL);
3254 if (!info->flag_buf) {
3255 kfree(info->tmp_rbuf);
3256 info->tmp_rbuf = NULL;
3257 return -ENOMEM;
3258 }
3259 return 0;
3260}
3261
3262static void free_tmp_rbuf(struct slgt_info *info)
3263{
3264 kfree(info->tmp_rbuf);
3265 info->tmp_rbuf = NULL;
3266 kfree(info->flag_buf);
3267 info->flag_buf = NULL;
3268}
3269
3270/*
3271 * allocate DMA descriptor lists.
3272 */
3273static int alloc_desc(struct slgt_info *info)
3274{
3275 unsigned int i;
3276 unsigned int pbufs;
3277
3278 /* allocate memory to hold descriptor lists */
3279 info->bufs = dma_alloc_coherent(&info->pdev->dev, DESC_LIST_SIZE,
3280 &info->bufs_dma_addr, GFP_KERNEL);
3281 if (info->bufs == NULL)
3282 return -ENOMEM;
3283
3284 info->rbufs = (struct slgt_desc*)info->bufs;
3285 info->tbufs = ((struct slgt_desc*)info->bufs) + info->rbuf_count;
3286
3287 pbufs = (unsigned int)info->bufs_dma_addr;
3288
3289 /*
3290 * Build circular lists of descriptors
3291 */
3292
3293 for (i=0; i < info->rbuf_count; i++) {
3294 /* physical address of this descriptor */
3295 info->rbufs[i].pdesc = pbufs + (i * sizeof(struct slgt_desc));
3296
3297 /* physical address of next descriptor */
3298 if (i == info->rbuf_count - 1)
3299 info->rbufs[i].next = cpu_to_le32(pbufs);
3300 else
3301 info->rbufs[i].next = cpu_to_le32(pbufs + ((i+1) * sizeof(struct slgt_desc)));
3302 set_desc_count(info->rbufs[i], DMABUFSIZE);
3303 }
3304
3305 for (i=0; i < info->tbuf_count; i++) {
3306 /* physical address of this descriptor */
3307 info->tbufs[i].pdesc = pbufs + ((info->rbuf_count + i) * sizeof(struct slgt_desc));
3308
3309 /* physical address of next descriptor */
3310 if (i == info->tbuf_count - 1)
3311 info->tbufs[i].next = cpu_to_le32(pbufs + info->rbuf_count * sizeof(struct slgt_desc));
3312 else
3313 info->tbufs[i].next = cpu_to_le32(pbufs + ((info->rbuf_count + i + 1) * sizeof(struct slgt_desc)));
3314 }
3315
3316 return 0;
3317}
3318
3319static void free_desc(struct slgt_info *info)
3320{
3321 if (info->bufs != NULL) {
3322 dma_free_coherent(&info->pdev->dev, DESC_LIST_SIZE,
3323 info->bufs, info->bufs_dma_addr);
3324 info->bufs = NULL;
3325 info->rbufs = NULL;
3326 info->tbufs = NULL;
3327 }
3328}
3329
3330static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3331{
3332 int i;
3333 for (i=0; i < count; i++) {
3334 bufs[i].buf = dma_alloc_coherent(&info->pdev->dev, DMABUFSIZE,
3335 &bufs[i].buf_dma_addr, GFP_KERNEL);
3336 if (!bufs[i].buf)
3337 return -ENOMEM;
3338 bufs[i].pbuf = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
3339 }
3340 return 0;
3341}
3342
3343static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
3344{
3345 int i;
3346 for (i=0; i < count; i++) {
3347 if (bufs[i].buf == NULL)
3348 continue;
3349 dma_free_coherent(&info->pdev->dev, DMABUFSIZE, bufs[i].buf,
3350 bufs[i].buf_dma_addr);
3351 bufs[i].buf = NULL;
3352 }
3353}
3354
3355static int alloc_dma_bufs(struct slgt_info *info)
3356{
3357 info->rbuf_count = 32;
3358 info->tbuf_count = 32;
3359
3360 if (alloc_desc(info) < 0 ||
3361 alloc_bufs(info, info->rbufs, info->rbuf_count) < 0 ||
3362 alloc_bufs(info, info->tbufs, info->tbuf_count) < 0 ||
3363 alloc_tmp_rbuf(info) < 0) {
3364 DBGERR(("%s DMA buffer alloc fail\n", info->device_name));
3365 return -ENOMEM;
3366 }
3367 reset_rbufs(info);
3368 return 0;
3369}
3370
3371static void free_dma_bufs(struct slgt_info *info)
3372{
3373 if (info->bufs) {
3374 free_bufs(info, info->rbufs, info->rbuf_count);
3375 free_bufs(info, info->tbufs, info->tbuf_count);
3376 free_desc(info);
3377 }
3378 free_tmp_rbuf(info);
3379}
3380
3381static int claim_resources(struct slgt_info *info)
3382{
3383 if (request_mem_region(info->phys_reg_addr, SLGT_REG_SIZE, "synclink_gt") == NULL) {
3384 DBGERR(("%s reg addr conflict, addr=%08X\n",
3385 info->device_name, info->phys_reg_addr));
3386 info->init_error = DiagStatus_AddressConflict;
3387 goto errout;
3388 }
3389 else
3390 info->reg_addr_requested = true;
3391
3392 info->reg_addr = ioremap(info->phys_reg_addr, SLGT_REG_SIZE);
3393 if (!info->reg_addr) {
3394 DBGERR(("%s can't map device registers, addr=%08X\n",
3395 info->device_name, info->phys_reg_addr));
3396 info->init_error = DiagStatus_CantAssignPciResources;
3397 goto errout;
3398 }
3399 return 0;
3400
3401errout:
3402 release_resources(info);
3403 return -ENODEV;
3404}
3405
3406static void release_resources(struct slgt_info *info)
3407{
3408 if (info->irq_requested) {
3409 free_irq(info->irq_level, info);
3410 info->irq_requested = false;
3411 }
3412
3413 if (info->reg_addr_requested) {
3414 release_mem_region(info->phys_reg_addr, SLGT_REG_SIZE);
3415 info->reg_addr_requested = false;
3416 }
3417
3418 if (info->reg_addr) {
3419 iounmap(info->reg_addr);
3420 info->reg_addr = NULL;
3421 }
3422}
3423
3424/* Add the specified device instance data structure to the
3425 * global linked list of devices and increment the device count.
3426 */
3427static void add_device(struct slgt_info *info)
3428{
3429 char *devstr;
3430
3431 info->next_device = NULL;
3432 info->line = slgt_device_count;
3433 sprintf(info->device_name, "%s%d", tty_dev_prefix, info->line);
3434
3435 if (info->line < MAX_DEVICES) {
3436 if (maxframe[info->line])
3437 info->max_frame_size = maxframe[info->line];
3438 }
3439
3440 slgt_device_count++;
3441
3442 if (!slgt_device_list)
3443 slgt_device_list = info;
3444 else {
3445 struct slgt_info *current_dev = slgt_device_list;
3446 while(current_dev->next_device)
3447 current_dev = current_dev->next_device;
3448 current_dev->next_device = info;
3449 }
3450
3451 if (info->max_frame_size < 4096)
3452 info->max_frame_size = 4096;
3453 else if (info->max_frame_size > 65535)
3454 info->max_frame_size = 65535;
3455
3456 switch(info->pdev->device) {
3457 case SYNCLINK_GT_DEVICE_ID:
3458 devstr = "GT";
3459 break;
3460 case SYNCLINK_GT2_DEVICE_ID:
3461 devstr = "GT2";
3462 break;
3463 case SYNCLINK_GT4_DEVICE_ID:
3464 devstr = "GT4";
3465 break;
3466 case SYNCLINK_AC_DEVICE_ID:
3467 devstr = "AC";
3468 info->params.mode = MGSL_MODE_ASYNC;
3469 break;
3470 default:
3471 devstr = "(unknown model)";
3472 }
3473 printk("SyncLink %s %s IO=%08x IRQ=%d MaxFrameSize=%u\n",
3474 devstr, info->device_name, info->phys_reg_addr,
3475 info->irq_level, info->max_frame_size);
3476
3477#if SYNCLINK_GENERIC_HDLC
3478 hdlcdev_init(info);
3479#endif
3480}
3481
3482static const struct tty_port_operations slgt_port_ops = {
3483 .carrier_raised = carrier_raised,
3484 .dtr_rts = dtr_rts,
3485};
3486
3487/*
3488 * allocate device instance structure, return NULL on failure
3489 */
3490static struct slgt_info *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3491{
3492 struct slgt_info *info;
3493
3494 info = kzalloc(sizeof(struct slgt_info), GFP_KERNEL);
3495
3496 if (!info) {
3497 DBGERR(("%s device alloc failed adapter=%d port=%d\n",
3498 driver_name, adapter_num, port_num));
3499 } else {
3500 tty_port_init(&info->port);
3501 info->port.ops = &slgt_port_ops;
3502 info->magic = MGSL_MAGIC;
3503 INIT_WORK(&info->task, bh_handler);
3504 info->max_frame_size = 4096;
3505 info->base_clock = 14745600;
3506 info->rbuf_fill_level = DMABUFSIZE;
3507 init_waitqueue_head(&info->status_event_wait_q);
3508 init_waitqueue_head(&info->event_wait_q);
3509 spin_lock_init(&info->netlock);
3510 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3511 info->idle_mode = HDLC_TXIDLE_FLAGS;
3512 info->adapter_num = adapter_num;
3513 info->port_num = port_num;
3514
3515 timer_setup(&info->tx_timer, tx_timeout, 0);
3516 timer_setup(&info->rx_timer, rx_timeout, 0);
3517
3518 /* Copy configuration info to device instance data */
3519 info->pdev = pdev;
3520 info->irq_level = pdev->irq;
3521 info->phys_reg_addr = pci_resource_start(pdev,0);
3522
3523 info->bus_type = MGSL_BUS_TYPE_PCI;
3524 info->irq_flags = IRQF_SHARED;
3525
3526 info->init_error = -1; /* assume error, set to 0 on successful init */
3527 }
3528
3529 return info;
3530}
3531
3532static void device_init(int adapter_num, struct pci_dev *pdev)
3533{
3534 struct slgt_info *port_array[SLGT_MAX_PORTS];
3535 int i;
3536 int port_count = 1;
3537
3538 if (pdev->device == SYNCLINK_GT2_DEVICE_ID)
3539 port_count = 2;
3540 else if (pdev->device == SYNCLINK_GT4_DEVICE_ID)
3541 port_count = 4;
3542
3543 /* allocate device instances for all ports */
3544 for (i=0; i < port_count; ++i) {
3545 port_array[i] = alloc_dev(adapter_num, i, pdev);
3546 if (port_array[i] == NULL) {
3547 for (--i; i >= 0; --i) {
3548 tty_port_destroy(&port_array[i]->port);
3549 kfree(port_array[i]);
3550 }
3551 return;
3552 }
3553 }
3554
3555 /* give copy of port_array to all ports and add to device list */
3556 for (i=0; i < port_count; ++i) {
3557 memcpy(port_array[i]->port_array, port_array, sizeof(port_array));
3558 add_device(port_array[i]);
3559 port_array[i]->port_count = port_count;
3560 spin_lock_init(&port_array[i]->lock);
3561 }
3562
3563 /* Allocate and claim adapter resources */
3564 if (!claim_resources(port_array[0])) {
3565
3566 alloc_dma_bufs(port_array[0]);
3567
3568 /* copy resource information from first port to others */
3569 for (i = 1; i < port_count; ++i) {
3570 port_array[i]->irq_level = port_array[0]->irq_level;
3571 port_array[i]->reg_addr = port_array[0]->reg_addr;
3572 alloc_dma_bufs(port_array[i]);
3573 }
3574
3575 if (request_irq(port_array[0]->irq_level,
3576 slgt_interrupt,
3577 port_array[0]->irq_flags,
3578 port_array[0]->device_name,
3579 port_array[0]) < 0) {
3580 DBGERR(("%s request_irq failed IRQ=%d\n",
3581 port_array[0]->device_name,
3582 port_array[0]->irq_level));
3583 } else {
3584 port_array[0]->irq_requested = true;
3585 adapter_test(port_array[0]);
3586 for (i=1 ; i < port_count ; i++) {
3587 port_array[i]->init_error = port_array[0]->init_error;
3588 port_array[i]->gpio_present = port_array[0]->gpio_present;
3589 }
3590 }
3591 }
3592
3593 for (i = 0; i < port_count; ++i) {
3594 struct slgt_info *info = port_array[i];
3595 tty_port_register_device(&info->port, serial_driver, info->line,
3596 &info->pdev->dev);
3597 }
3598}
3599
3600static int init_one(struct pci_dev *dev,
3601 const struct pci_device_id *ent)
3602{
3603 if (pci_enable_device(dev)) {
3604 printk("error enabling pci device %p\n", dev);
3605 return -EIO;
3606 }
3607 pci_set_master(dev);
3608 device_init(slgt_device_count, dev);
3609 return 0;
3610}
3611
3612static void remove_one(struct pci_dev *dev)
3613{
3614}
3615
3616static const struct tty_operations ops = {
3617 .open = open,
3618 .close = close,
3619 .write = write,
3620 .put_char = put_char,
3621 .flush_chars = flush_chars,
3622 .write_room = write_room,
3623 .chars_in_buffer = chars_in_buffer,
3624 .flush_buffer = flush_buffer,
3625 .ioctl = ioctl,
3626 .compat_ioctl = slgt_compat_ioctl,
3627 .throttle = throttle,
3628 .unthrottle = unthrottle,
3629 .send_xchar = send_xchar,
3630 .break_ctl = set_break,
3631 .wait_until_sent = wait_until_sent,
3632 .set_termios = set_termios,
3633 .stop = tx_hold,
3634 .start = tx_release,
3635 .hangup = hangup,
3636 .tiocmget = tiocmget,
3637 .tiocmset = tiocmset,
3638 .get_icount = get_icount,
3639 .proc_show = synclink_gt_proc_show,
3640};
3641
3642static void slgt_cleanup(void)
3643{
3644 struct slgt_info *info;
3645 struct slgt_info *tmp;
3646
3647 printk(KERN_INFO "unload %s\n", driver_name);
3648
3649 if (serial_driver) {
3650 for (info=slgt_device_list ; info != NULL ; info=info->next_device)
3651 tty_unregister_device(serial_driver, info->line);
3652 tty_unregister_driver(serial_driver);
3653 put_tty_driver(serial_driver);
3654 }
3655
3656 /* reset devices */
3657 info = slgt_device_list;
3658 while(info) {
3659 reset_port(info);
3660 info = info->next_device;
3661 }
3662
3663 /* release devices */
3664 info = slgt_device_list;
3665 while(info) {
3666#if SYNCLINK_GENERIC_HDLC
3667 hdlcdev_exit(info);
3668#endif
3669 free_dma_bufs(info);
3670 free_tmp_rbuf(info);
3671 if (info->port_num == 0)
3672 release_resources(info);
3673 tmp = info;
3674 info = info->next_device;
3675 tty_port_destroy(&tmp->port);
3676 kfree(tmp);
3677 }
3678
3679 if (pci_registered)
3680 pci_unregister_driver(&pci_driver);
3681}
3682
3683/*
3684 * Driver initialization entry point.
3685 */
3686static int __init slgt_init(void)
3687{
3688 int rc;
3689
3690 printk(KERN_INFO "%s\n", driver_name);
3691
3692 serial_driver = alloc_tty_driver(MAX_DEVICES);
3693 if (!serial_driver) {
3694 printk("%s can't allocate tty driver\n", driver_name);
3695 return -ENOMEM;
3696 }
3697
3698 /* Initialize the tty_driver structure */
3699
3700 serial_driver->driver_name = slgt_driver_name;
3701 serial_driver->name = tty_dev_prefix;
3702 serial_driver->major = ttymajor;
3703 serial_driver->minor_start = 64;
3704 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
3705 serial_driver->subtype = SERIAL_TYPE_NORMAL;
3706 serial_driver->init_termios = tty_std_termios;
3707 serial_driver->init_termios.c_cflag =
3708 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
3709 serial_driver->init_termios.c_ispeed = 9600;
3710 serial_driver->init_termios.c_ospeed = 9600;
3711 serial_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
3712 tty_set_operations(serial_driver, &ops);
3713 if ((rc = tty_register_driver(serial_driver)) < 0) {
3714 DBGERR(("%s can't register serial driver\n", driver_name));
3715 put_tty_driver(serial_driver);
3716 serial_driver = NULL;
3717 goto error;
3718 }
3719
3720 printk(KERN_INFO "%s, tty major#%d\n",
3721 driver_name, serial_driver->major);
3722
3723 slgt_device_count = 0;
3724 if ((rc = pci_register_driver(&pci_driver)) < 0) {
3725 printk("%s pci_register_driver error=%d\n", driver_name, rc);
3726 goto error;
3727 }
3728 pci_registered = true;
3729
3730 if (!slgt_device_list)
3731 printk("%s no devices found\n",driver_name);
3732
3733 return 0;
3734
3735error:
3736 slgt_cleanup();
3737 return rc;
3738}
3739
3740static void __exit slgt_exit(void)
3741{
3742 slgt_cleanup();
3743}
3744
3745module_init(slgt_init);
3746module_exit(slgt_exit);
3747
3748/*
3749 * register access routines
3750 */
3751
3752#define CALC_REGADDR() \
3753 unsigned long reg_addr = ((unsigned long)info->reg_addr) + addr; \
3754 if (addr >= 0x80) \
3755 reg_addr += (info->port_num) * 32; \
3756 else if (addr >= 0x40) \
3757 reg_addr += (info->port_num) * 16;
3758
3759static __u8 rd_reg8(struct slgt_info *info, unsigned int addr)
3760{
3761 CALC_REGADDR();
3762 return readb((void __iomem *)reg_addr);
3763}
3764
3765static void wr_reg8(struct slgt_info *info, unsigned int addr, __u8 value)
3766{
3767 CALC_REGADDR();
3768 writeb(value, (void __iomem *)reg_addr);
3769}
3770
3771static __u16 rd_reg16(struct slgt_info *info, unsigned int addr)
3772{
3773 CALC_REGADDR();
3774 return readw((void __iomem *)reg_addr);
3775}
3776
3777static void wr_reg16(struct slgt_info *info, unsigned int addr, __u16 value)
3778{
3779 CALC_REGADDR();
3780 writew(value, (void __iomem *)reg_addr);
3781}
3782
3783static __u32 rd_reg32(struct slgt_info *info, unsigned int addr)
3784{
3785 CALC_REGADDR();
3786 return readl((void __iomem *)reg_addr);
3787}
3788
3789static void wr_reg32(struct slgt_info *info, unsigned int addr, __u32 value)
3790{
3791 CALC_REGADDR();
3792 writel(value, (void __iomem *)reg_addr);
3793}
3794
3795static void rdma_reset(struct slgt_info *info)
3796{
3797 unsigned int i;
3798
3799 /* set reset bit */
3800 wr_reg32(info, RDCSR, BIT1);
3801
3802 /* wait for enable bit cleared */
3803 for(i=0 ; i < 1000 ; i++)
3804 if (!(rd_reg32(info, RDCSR) & BIT0))
3805 break;
3806}
3807
3808static void tdma_reset(struct slgt_info *info)
3809{
3810 unsigned int i;
3811
3812 /* set reset bit */
3813 wr_reg32(info, TDCSR, BIT1);
3814
3815 /* wait for enable bit cleared */
3816 for(i=0 ; i < 1000 ; i++)
3817 if (!(rd_reg32(info, TDCSR) & BIT0))
3818 break;
3819}
3820
3821/*
3822 * enable internal loopback
3823 * TxCLK and RxCLK are generated from BRG
3824 * and TxD is looped back to RxD internally.
3825 */
3826static void enable_loopback(struct slgt_info *info)
3827{
3828 /* SCR (serial control) BIT2=loopback enable */
3829 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT2));
3830
3831 if (info->params.mode != MGSL_MODE_ASYNC) {
3832 /* CCR (clock control)
3833 * 07..05 tx clock source (010 = BRG)
3834 * 04..02 rx clock source (010 = BRG)
3835 * 01 auxclk enable (0 = disable)
3836 * 00 BRG enable (1 = enable)
3837 *
3838 * 0100 1001
3839 */
3840 wr_reg8(info, CCR, 0x49);
3841
3842 /* set speed if available, otherwise use default */
3843 if (info->params.clock_speed)
3844 set_rate(info, info->params.clock_speed);
3845 else
3846 set_rate(info, 3686400);
3847 }
3848}
3849
3850/*
3851 * set baud rate generator to specified rate
3852 */
3853static void set_rate(struct slgt_info *info, u32 rate)
3854{
3855 unsigned int div;
3856 unsigned int osc = info->base_clock;
3857
3858 /* div = osc/rate - 1
3859 *
3860 * Round div up if osc/rate is not integer to
3861 * force to next slowest rate.
3862 */
3863
3864 if (rate) {
3865 div = osc/rate;
3866 if (!(osc % rate) && div)
3867 div--;
3868 wr_reg16(info, BDR, (unsigned short)div);
3869 }
3870}
3871
3872static void rx_stop(struct slgt_info *info)
3873{
3874 unsigned short val;
3875
3876 /* disable and reset receiver */
3877 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3878 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3879 wr_reg16(info, RCR, val); /* clear reset bit */
3880
3881 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA + IRQ_RXIDLE);
3882
3883 /* clear pending rx interrupts */
3884 wr_reg16(info, SSR, IRQ_RXIDLE + IRQ_RXOVER);
3885
3886 rdma_reset(info);
3887
3888 info->rx_enabled = false;
3889 info->rx_restart = false;
3890}
3891
3892static void rx_start(struct slgt_info *info)
3893{
3894 unsigned short val;
3895
3896 slgt_irq_off(info, IRQ_RXOVER + IRQ_RXDATA);
3897
3898 /* clear pending rx overrun IRQ */
3899 wr_reg16(info, SSR, IRQ_RXOVER);
3900
3901 /* reset and disable receiver */
3902 val = rd_reg16(info, RCR) & ~BIT1; /* clear enable bit */
3903 wr_reg16(info, RCR, (unsigned short)(val | BIT2)); /* set reset bit */
3904 wr_reg16(info, RCR, val); /* clear reset bit */
3905
3906 rdma_reset(info);
3907 reset_rbufs(info);
3908
3909 if (info->rx_pio) {
3910 /* rx request when rx FIFO not empty */
3911 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) & ~BIT14));
3912 slgt_irq_on(info, IRQ_RXDATA);
3913 if (info->params.mode == MGSL_MODE_ASYNC) {
3914 /* enable saving of rx status */
3915 wr_reg32(info, RDCSR, BIT6);
3916 }
3917 } else {
3918 /* rx request when rx FIFO half full */
3919 wr_reg16(info, SCR, (unsigned short)(rd_reg16(info, SCR) | BIT14));
3920 /* set 1st descriptor address */
3921 wr_reg32(info, RDDAR, info->rbufs[0].pdesc);
3922
3923 if (info->params.mode != MGSL_MODE_ASYNC) {
3924 /* enable rx DMA and DMA interrupt */
3925 wr_reg32(info, RDCSR, (BIT2 + BIT0));
3926 } else {
3927 /* enable saving of rx status, rx DMA and DMA interrupt */
3928 wr_reg32(info, RDCSR, (BIT6 + BIT2 + BIT0));
3929 }
3930 }
3931
3932 slgt_irq_on(info, IRQ_RXOVER);
3933
3934 /* enable receiver */
3935 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | BIT1));
3936
3937 info->rx_restart = false;
3938 info->rx_enabled = true;
3939}
3940
3941static void tx_start(struct slgt_info *info)
3942{
3943 if (!info->tx_enabled) {
3944 wr_reg16(info, TCR,
3945 (unsigned short)((rd_reg16(info, TCR) | BIT1) & ~BIT2));
3946 info->tx_enabled = true;
3947 }
3948
3949 if (desc_count(info->tbufs[info->tbuf_start])) {
3950 info->drop_rts_on_tx_done = false;
3951
3952 if (info->params.mode != MGSL_MODE_ASYNC) {
3953 if (info->params.flags & HDLC_FLAG_AUTO_RTS) {
3954 get_gtsignals(info);
3955 if (!(info->signals & SerialSignal_RTS)) {
3956 info->signals |= SerialSignal_RTS;
3957 set_gtsignals(info);
3958 info->drop_rts_on_tx_done = true;
3959 }
3960 }
3961
3962 slgt_irq_off(info, IRQ_TXDATA);
3963 slgt_irq_on(info, IRQ_TXUNDER + IRQ_TXIDLE);
3964 /* clear tx idle and underrun status bits */
3965 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3966 } else {
3967 slgt_irq_off(info, IRQ_TXDATA);
3968 slgt_irq_on(info, IRQ_TXIDLE);
3969 /* clear tx idle status bit */
3970 wr_reg16(info, SSR, IRQ_TXIDLE);
3971 }
3972 /* set 1st descriptor address and start DMA */
3973 wr_reg32(info, TDDAR, info->tbufs[info->tbuf_start].pdesc);
3974 wr_reg32(info, TDCSR, BIT2 + BIT0);
3975 info->tx_active = true;
3976 }
3977}
3978
3979static void tx_stop(struct slgt_info *info)
3980{
3981 unsigned short val;
3982
3983 del_timer(&info->tx_timer);
3984
3985 tdma_reset(info);
3986
3987 /* reset and disable transmitter */
3988 val = rd_reg16(info, TCR) & ~BIT1; /* clear enable bit */
3989 wr_reg16(info, TCR, (unsigned short)(val | BIT2)); /* set reset bit */
3990
3991 slgt_irq_off(info, IRQ_TXDATA + IRQ_TXIDLE + IRQ_TXUNDER);
3992
3993 /* clear tx idle and underrun status bit */
3994 wr_reg16(info, SSR, (unsigned short)(IRQ_TXIDLE + IRQ_TXUNDER));
3995
3996 reset_tbufs(info);
3997
3998 info->tx_enabled = false;
3999 info->tx_active = false;
4000}
4001
4002static void reset_port(struct slgt_info *info)
4003{
4004 if (!info->reg_addr)
4005 return;
4006
4007 tx_stop(info);
4008 rx_stop(info);
4009
4010 info->signals &= ~(SerialSignal_RTS | SerialSignal_DTR);
4011 set_gtsignals(info);
4012
4013 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4014}
4015
4016static void reset_adapter(struct slgt_info *info)
4017{
4018 int i;
4019 for (i=0; i < info->port_count; ++i) {
4020 if (info->port_array[i])
4021 reset_port(info->port_array[i]);
4022 }
4023}
4024
4025static void async_mode(struct slgt_info *info)
4026{
4027 unsigned short val;
4028
4029 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4030 tx_stop(info);
4031 rx_stop(info);
4032
4033 /* TCR (tx control)
4034 *
4035 * 15..13 mode, 010=async
4036 * 12..10 encoding, 000=NRZ
4037 * 09 parity enable
4038 * 08 1=odd parity, 0=even parity
4039 * 07 1=RTS driver control
4040 * 06 1=break enable
4041 * 05..04 character length
4042 * 00=5 bits
4043 * 01=6 bits
4044 * 10=7 bits
4045 * 11=8 bits
4046 * 03 0=1 stop bit, 1=2 stop bits
4047 * 02 reset
4048 * 01 enable
4049 * 00 auto-CTS enable
4050 */
4051 val = 0x4000;
4052
4053 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4054 val |= BIT7;
4055
4056 if (info->params.parity != ASYNC_PARITY_NONE) {
4057 val |= BIT9;
4058 if (info->params.parity == ASYNC_PARITY_ODD)
4059 val |= BIT8;
4060 }
4061
4062 switch (info->params.data_bits)
4063 {
4064 case 6: val |= BIT4; break;
4065 case 7: val |= BIT5; break;
4066 case 8: val |= BIT5 + BIT4; break;
4067 }
4068
4069 if (info->params.stop_bits != 1)
4070 val |= BIT3;
4071
4072 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4073 val |= BIT0;
4074
4075 wr_reg16(info, TCR, val);
4076
4077 /* RCR (rx control)
4078 *
4079 * 15..13 mode, 010=async
4080 * 12..10 encoding, 000=NRZ
4081 * 09 parity enable
4082 * 08 1=odd parity, 0=even parity
4083 * 07..06 reserved, must be 0
4084 * 05..04 character length
4085 * 00=5 bits
4086 * 01=6 bits
4087 * 10=7 bits
4088 * 11=8 bits
4089 * 03 reserved, must be zero
4090 * 02 reset
4091 * 01 enable
4092 * 00 auto-DCD enable
4093 */
4094 val = 0x4000;
4095
4096 if (info->params.parity != ASYNC_PARITY_NONE) {
4097 val |= BIT9;
4098 if (info->params.parity == ASYNC_PARITY_ODD)
4099 val |= BIT8;
4100 }
4101
4102 switch (info->params.data_bits)
4103 {
4104 case 6: val |= BIT4; break;
4105 case 7: val |= BIT5; break;
4106 case 8: val |= BIT5 + BIT4; break;
4107 }
4108
4109 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4110 val |= BIT0;
4111
4112 wr_reg16(info, RCR, val);
4113
4114 /* CCR (clock control)
4115 *
4116 * 07..05 011 = tx clock source is BRG/16
4117 * 04..02 010 = rx clock source is BRG
4118 * 01 0 = auxclk disabled
4119 * 00 1 = BRG enabled
4120 *
4121 * 0110 1001
4122 */
4123 wr_reg8(info, CCR, 0x69);
4124
4125 msc_set_vcr(info);
4126
4127 /* SCR (serial control)
4128 *
4129 * 15 1=tx req on FIFO half empty
4130 * 14 1=rx req on FIFO half full
4131 * 13 tx data IRQ enable
4132 * 12 tx idle IRQ enable
4133 * 11 rx break on IRQ enable
4134 * 10 rx data IRQ enable
4135 * 09 rx break off IRQ enable
4136 * 08 overrun IRQ enable
4137 * 07 DSR IRQ enable
4138 * 06 CTS IRQ enable
4139 * 05 DCD IRQ enable
4140 * 04 RI IRQ enable
4141 * 03 0=16x sampling, 1=8x sampling
4142 * 02 1=txd->rxd internal loopback enable
4143 * 01 reserved, must be zero
4144 * 00 1=master IRQ enable
4145 */
4146 val = BIT15 + BIT14 + BIT0;
4147 /* JCR[8] : 1 = x8 async mode feature available */
4148 if ((rd_reg32(info, JCR) & BIT8) && info->params.data_rate &&
4149 ((info->base_clock < (info->params.data_rate * 16)) ||
4150 (info->base_clock % (info->params.data_rate * 16)))) {
4151 /* use 8x sampling */
4152 val |= BIT3;
4153 set_rate(info, info->params.data_rate * 8);
4154 } else {
4155 /* use 16x sampling */
4156 set_rate(info, info->params.data_rate * 16);
4157 }
4158 wr_reg16(info, SCR, val);
4159
4160 slgt_irq_on(info, IRQ_RXBREAK | IRQ_RXOVER);
4161
4162 if (info->params.loopback)
4163 enable_loopback(info);
4164}
4165
4166static void sync_mode(struct slgt_info *info)
4167{
4168 unsigned short val;
4169
4170 slgt_irq_off(info, IRQ_ALL | IRQ_MASTER);
4171 tx_stop(info);
4172 rx_stop(info);
4173
4174 /* TCR (tx control)
4175 *
4176 * 15..13 mode
4177 * 000=HDLC/SDLC
4178 * 001=raw bit synchronous
4179 * 010=asynchronous/isochronous
4180 * 011=monosync byte synchronous
4181 * 100=bisync byte synchronous
4182 * 101=xsync byte synchronous
4183 * 12..10 encoding
4184 * 09 CRC enable
4185 * 08 CRC32
4186 * 07 1=RTS driver control
4187 * 06 preamble enable
4188 * 05..04 preamble length
4189 * 03 share open/close flag
4190 * 02 reset
4191 * 01 enable
4192 * 00 auto-CTS enable
4193 */
4194 val = BIT2;
4195
4196 switch(info->params.mode) {
4197 case MGSL_MODE_XSYNC:
4198 val |= BIT15 + BIT13;
4199 break;
4200 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4201 case MGSL_MODE_BISYNC: val |= BIT15; break;
4202 case MGSL_MODE_RAW: val |= BIT13; break;
4203 }
4204 if (info->if_mode & MGSL_INTERFACE_RTS_EN)
4205 val |= BIT7;
4206
4207 switch(info->params.encoding)
4208 {
4209 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4210 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4211 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4212 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4213 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4214 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4215 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4216 }
4217
4218 switch (info->params.crc_type & HDLC_CRC_MASK)
4219 {
4220 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4221 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4222 }
4223
4224 if (info->params.preamble != HDLC_PREAMBLE_PATTERN_NONE)
4225 val |= BIT6;
4226
4227 switch (info->params.preamble_length)
4228 {
4229 case HDLC_PREAMBLE_LENGTH_16BITS: val |= BIT5; break;
4230 case HDLC_PREAMBLE_LENGTH_32BITS: val |= BIT4; break;
4231 case HDLC_PREAMBLE_LENGTH_64BITS: val |= BIT5 + BIT4; break;
4232 }
4233
4234 if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4235 val |= BIT0;
4236
4237 wr_reg16(info, TCR, val);
4238
4239 /* TPR (transmit preamble) */
4240
4241 switch (info->params.preamble)
4242 {
4243 case HDLC_PREAMBLE_PATTERN_FLAGS: val = 0x7e; break;
4244 case HDLC_PREAMBLE_PATTERN_ONES: val = 0xff; break;
4245 case HDLC_PREAMBLE_PATTERN_ZEROS: val = 0x00; break;
4246 case HDLC_PREAMBLE_PATTERN_10: val = 0x55; break;
4247 case HDLC_PREAMBLE_PATTERN_01: val = 0xaa; break;
4248 default: val = 0x7e; break;
4249 }
4250 wr_reg8(info, TPR, (unsigned char)val);
4251
4252 /* RCR (rx control)
4253 *
4254 * 15..13 mode
4255 * 000=HDLC/SDLC
4256 * 001=raw bit synchronous
4257 * 010=asynchronous/isochronous
4258 * 011=monosync byte synchronous
4259 * 100=bisync byte synchronous
4260 * 101=xsync byte synchronous
4261 * 12..10 encoding
4262 * 09 CRC enable
4263 * 08 CRC32
4264 * 07..03 reserved, must be 0
4265 * 02 reset
4266 * 01 enable
4267 * 00 auto-DCD enable
4268 */
4269 val = 0;
4270
4271 switch(info->params.mode) {
4272 case MGSL_MODE_XSYNC:
4273 val |= BIT15 + BIT13;
4274 break;
4275 case MGSL_MODE_MONOSYNC: val |= BIT14 + BIT13; break;
4276 case MGSL_MODE_BISYNC: val |= BIT15; break;
4277 case MGSL_MODE_RAW: val |= BIT13; break;
4278 }
4279
4280 switch(info->params.encoding)
4281 {
4282 case HDLC_ENCODING_NRZB: val |= BIT10; break;
4283 case HDLC_ENCODING_NRZI_MARK: val |= BIT11; break;
4284 case HDLC_ENCODING_NRZI: val |= BIT11 + BIT10; break;
4285 case HDLC_ENCODING_BIPHASE_MARK: val |= BIT12; break;
4286 case HDLC_ENCODING_BIPHASE_SPACE: val |= BIT12 + BIT10; break;
4287 case HDLC_ENCODING_BIPHASE_LEVEL: val |= BIT12 + BIT11; break;
4288 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL: val |= BIT12 + BIT11 + BIT10; break;
4289 }
4290
4291 switch (info->params.crc_type & HDLC_CRC_MASK)
4292 {
4293 case HDLC_CRC_16_CCITT: val |= BIT9; break;
4294 case HDLC_CRC_32_CCITT: val |= BIT9 + BIT8; break;
4295 }
4296
4297 if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4298 val |= BIT0;
4299
4300 wr_reg16(info, RCR, val);
4301
4302 /* CCR (clock control)
4303 *
4304 * 07..05 tx clock source
4305 * 04..02 rx clock source
4306 * 01 auxclk enable
4307 * 00 BRG enable
4308 */
4309 val = 0;
4310
4311 if (info->params.flags & HDLC_FLAG_TXC_BRG)
4312 {
4313 // when RxC source is DPLL, BRG generates 16X DPLL
4314 // reference clock, so take TxC from BRG/16 to get
4315 // transmit clock at actual data rate
4316 if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4317 val |= BIT6 + BIT5; /* 011, txclk = BRG/16 */
4318 else
4319 val |= BIT6; /* 010, txclk = BRG */
4320 }
4321 else if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4322 val |= BIT7; /* 100, txclk = DPLL Input */
4323 else if (info->params.flags & HDLC_FLAG_TXC_RXCPIN)
4324 val |= BIT5; /* 001, txclk = RXC Input */
4325
4326 if (info->params.flags & HDLC_FLAG_RXC_BRG)
4327 val |= BIT3; /* 010, rxclk = BRG */
4328 else if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4329 val |= BIT4; /* 100, rxclk = DPLL */
4330 else if (info->params.flags & HDLC_FLAG_RXC_TXCPIN)
4331 val |= BIT2; /* 001, rxclk = TXC Input */
4332
4333 if (info->params.clock_speed)
4334 val |= BIT1 + BIT0;
4335
4336 wr_reg8(info, CCR, (unsigned char)val);
4337
4338 if (info->params.flags & (HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL))
4339 {
4340 // program DPLL mode
4341 switch(info->params.encoding)
4342 {
4343 case HDLC_ENCODING_BIPHASE_MARK:
4344 case HDLC_ENCODING_BIPHASE_SPACE:
4345 val = BIT7; break;
4346 case HDLC_ENCODING_BIPHASE_LEVEL:
4347 case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:
4348 val = BIT7 + BIT6; break;
4349 default: val = BIT6; // NRZ encodings
4350 }
4351 wr_reg16(info, RCR, (unsigned short)(rd_reg16(info, RCR) | val));
4352
4353 // DPLL requires a 16X reference clock from BRG
4354 set_rate(info, info->params.clock_speed * 16);
4355 }
4356 else
4357 set_rate(info, info->params.clock_speed);
4358
4359 tx_set_idle(info);
4360
4361 msc_set_vcr(info);
4362
4363 /* SCR (serial control)
4364 *
4365 * 15 1=tx req on FIFO half empty
4366 * 14 1=rx req on FIFO half full
4367 * 13 tx data IRQ enable
4368 * 12 tx idle IRQ enable
4369 * 11 underrun IRQ enable
4370 * 10 rx data IRQ enable
4371 * 09 rx idle IRQ enable
4372 * 08 overrun IRQ enable
4373 * 07 DSR IRQ enable
4374 * 06 CTS IRQ enable
4375 * 05 DCD IRQ enable
4376 * 04 RI IRQ enable
4377 * 03 reserved, must be zero
4378 * 02 1=txd->rxd internal loopback enable
4379 * 01 reserved, must be zero
4380 * 00 1=master IRQ enable
4381 */
4382 wr_reg16(info, SCR, BIT15 + BIT14 + BIT0);
4383
4384 if (info->params.loopback)
4385 enable_loopback(info);
4386}
4387
4388/*
4389 * set transmit idle mode
4390 */
4391static void tx_set_idle(struct slgt_info *info)
4392{
4393 unsigned char val;
4394 unsigned short tcr;
4395
4396 /* if preamble enabled (tcr[6] == 1) then tx idle size = 8 bits
4397 * else tcr[5:4] = tx idle size: 00 = 8 bits, 01 = 16 bits
4398 */
4399 tcr = rd_reg16(info, TCR);
4400 if (info->idle_mode & HDLC_TXIDLE_CUSTOM_16) {
4401 /* disable preamble, set idle size to 16 bits */
4402 tcr = (tcr & ~(BIT6 + BIT5)) | BIT4;
4403 /* MSB of 16 bit idle specified in tx preamble register (TPR) */
4404 wr_reg8(info, TPR, (unsigned char)((info->idle_mode >> 8) & 0xff));
4405 } else if (!(tcr & BIT6)) {
4406 /* preamble is disabled, set idle size to 8 bits */
4407 tcr &= ~(BIT5 + BIT4);
4408 }
4409 wr_reg16(info, TCR, tcr);
4410
4411 if (info->idle_mode & (HDLC_TXIDLE_CUSTOM_8 | HDLC_TXIDLE_CUSTOM_16)) {
4412 /* LSB of custom tx idle specified in tx idle register */
4413 val = (unsigned char)(info->idle_mode & 0xff);
4414 } else {
4415 /* standard 8 bit idle patterns */
4416 switch(info->idle_mode)
4417 {
4418 case HDLC_TXIDLE_FLAGS: val = 0x7e; break;
4419 case HDLC_TXIDLE_ALT_ZEROS_ONES:
4420 case HDLC_TXIDLE_ALT_MARK_SPACE: val = 0xaa; break;
4421 case HDLC_TXIDLE_ZEROS:
4422 case HDLC_TXIDLE_SPACE: val = 0x00; break;
4423 default: val = 0xff;
4424 }
4425 }
4426
4427 wr_reg8(info, TIR, val);
4428}
4429
4430/*
4431 * get state of V24 status (input) signals
4432 */
4433static void get_gtsignals(struct slgt_info *info)
4434{
4435 unsigned short status = rd_reg16(info, SSR);
4436
4437 /* clear all serial signals except RTS and DTR */
4438 info->signals &= SerialSignal_RTS | SerialSignal_DTR;
4439
4440 if (status & BIT3)
4441 info->signals |= SerialSignal_DSR;
4442 if (status & BIT2)
4443 info->signals |= SerialSignal_CTS;
4444 if (status & BIT1)
4445 info->signals |= SerialSignal_DCD;
4446 if (status & BIT0)
4447 info->signals |= SerialSignal_RI;
4448}
4449
4450/*
4451 * set V.24 Control Register based on current configuration
4452 */
4453static void msc_set_vcr(struct slgt_info *info)
4454{
4455 unsigned char val = 0;
4456
4457 /* VCR (V.24 control)
4458 *
4459 * 07..04 serial IF select
4460 * 03 DTR
4461 * 02 RTS
4462 * 01 LL
4463 * 00 RL
4464 */
4465
4466 switch(info->if_mode & MGSL_INTERFACE_MASK)
4467 {
4468 case MGSL_INTERFACE_RS232:
4469 val |= BIT5; /* 0010 */
4470 break;
4471 case MGSL_INTERFACE_V35:
4472 val |= BIT7 + BIT6 + BIT5; /* 1110 */
4473 break;
4474 case MGSL_INTERFACE_RS422:
4475 val |= BIT6; /* 0100 */
4476 break;
4477 }
4478
4479 if (info->if_mode & MGSL_INTERFACE_MSB_FIRST)
4480 val |= BIT4;
4481 if (info->signals & SerialSignal_DTR)
4482 val |= BIT3;
4483 if (info->signals & SerialSignal_RTS)
4484 val |= BIT2;
4485 if (info->if_mode & MGSL_INTERFACE_LL)
4486 val |= BIT1;
4487 if (info->if_mode & MGSL_INTERFACE_RL)
4488 val |= BIT0;
4489 wr_reg8(info, VCR, val);
4490}
4491
4492/*
4493 * set state of V24 control (output) signals
4494 */
4495static void set_gtsignals(struct slgt_info *info)
4496{
4497 unsigned char val = rd_reg8(info, VCR);
4498 if (info->signals & SerialSignal_DTR)
4499 val |= BIT3;
4500 else
4501 val &= ~BIT3;
4502 if (info->signals & SerialSignal_RTS)
4503 val |= BIT2;
4504 else
4505 val &= ~BIT2;
4506 wr_reg8(info, VCR, val);
4507}
4508
4509/*
4510 * free range of receive DMA buffers (i to last)
4511 */
4512static void free_rbufs(struct slgt_info *info, unsigned int i, unsigned int last)
4513{
4514 int done = 0;
4515
4516 while(!done) {
4517 /* reset current buffer for reuse */
4518 info->rbufs[i].status = 0;
4519 set_desc_count(info->rbufs[i], info->rbuf_fill_level);
4520 if (i == last)
4521 done = 1;
4522 if (++i == info->rbuf_count)
4523 i = 0;
4524 }
4525 info->rbuf_current = i;
4526}
4527
4528/*
4529 * mark all receive DMA buffers as free
4530 */
4531static void reset_rbufs(struct slgt_info *info)
4532{
4533 free_rbufs(info, 0, info->rbuf_count - 1);
4534 info->rbuf_fill_index = 0;
4535 info->rbuf_fill_count = 0;
4536}
4537
4538/*
4539 * pass receive HDLC frame to upper layer
4540 *
4541 * return true if frame available, otherwise false
4542 */
4543static bool rx_get_frame(struct slgt_info *info)
4544{
4545 unsigned int start, end;
4546 unsigned short status;
4547 unsigned int framesize = 0;
4548 unsigned long flags;
4549 struct tty_struct *tty = info->port.tty;
4550 unsigned char addr_field = 0xff;
4551 unsigned int crc_size = 0;
4552
4553 switch (info->params.crc_type & HDLC_CRC_MASK) {
4554 case HDLC_CRC_16_CCITT: crc_size = 2; break;
4555 case HDLC_CRC_32_CCITT: crc_size = 4; break;
4556 }
4557
4558check_again:
4559
4560 framesize = 0;
4561 addr_field = 0xff;
4562 start = end = info->rbuf_current;
4563
4564 for (;;) {
4565 if (!desc_complete(info->rbufs[end]))
4566 goto cleanup;
4567
4568 if (framesize == 0 && info->params.addr_filter != 0xff)
4569 addr_field = info->rbufs[end].buf[0];
4570
4571 framesize += desc_count(info->rbufs[end]);
4572
4573 if (desc_eof(info->rbufs[end]))
4574 break;
4575
4576 if (++end == info->rbuf_count)
4577 end = 0;
4578
4579 if (end == info->rbuf_current) {
4580 if (info->rx_enabled){
4581 spin_lock_irqsave(&info->lock,flags);
4582 rx_start(info);
4583 spin_unlock_irqrestore(&info->lock,flags);
4584 }
4585 goto cleanup;
4586 }
4587 }
4588
4589 /* status
4590 *
4591 * 15 buffer complete
4592 * 14..06 reserved
4593 * 05..04 residue
4594 * 02 eof (end of frame)
4595 * 01 CRC error
4596 * 00 abort
4597 */
4598 status = desc_status(info->rbufs[end]);
4599
4600 /* ignore CRC bit if not using CRC (bit is undefined) */
4601 if ((info->params.crc_type & HDLC_CRC_MASK) == HDLC_CRC_NONE)
4602 status &= ~BIT1;
4603
4604 if (framesize == 0 ||
4605 (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4606 free_rbufs(info, start, end);
4607 goto check_again;
4608 }
4609
4610 if (framesize < (2 + crc_size) || status & BIT0) {
4611 info->icount.rxshort++;
4612 framesize = 0;
4613 } else if (status & BIT1) {
4614 info->icount.rxcrc++;
4615 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX))
4616 framesize = 0;
4617 }
4618
4619#if SYNCLINK_GENERIC_HDLC
4620 if (framesize == 0) {
4621 info->netdev->stats.rx_errors++;
4622 info->netdev->stats.rx_frame_errors++;
4623 }
4624#endif
4625
4626 DBGBH(("%s rx frame status=%04X size=%d\n",
4627 info->device_name, status, framesize));
4628 DBGDATA(info, info->rbufs[start].buf, min_t(int, framesize, info->rbuf_fill_level), "rx");
4629
4630 if (framesize) {
4631 if (!(info->params.crc_type & HDLC_CRC_RETURN_EX)) {
4632 framesize -= crc_size;
4633 crc_size = 0;
4634 }
4635
4636 if (framesize > info->max_frame_size + crc_size)
4637 info->icount.rxlong++;
4638 else {
4639 /* copy dma buffer(s) to contiguous temp buffer */
4640 int copy_count = framesize;
4641 int i = start;
4642 unsigned char *p = info->tmp_rbuf;
4643 info->tmp_rbuf_count = framesize;
4644
4645 info->icount.rxok++;
4646
4647 while(copy_count) {
4648 int partial_count = min_t(int, copy_count, info->rbuf_fill_level);
4649 memcpy(p, info->rbufs[i].buf, partial_count);
4650 p += partial_count;
4651 copy_count -= partial_count;
4652 if (++i == info->rbuf_count)
4653 i = 0;
4654 }
4655
4656 if (info->params.crc_type & HDLC_CRC_RETURN_EX) {
4657 *p = (status & BIT1) ? RX_CRC_ERROR : RX_OK;
4658 framesize++;
4659 }
4660
4661#if SYNCLINK_GENERIC_HDLC
4662 if (info->netcount)
4663 hdlcdev_rx(info,info->tmp_rbuf, framesize);
4664 else
4665#endif
4666 ldisc_receive_buf(tty, info->tmp_rbuf, info->flag_buf, framesize);
4667 }
4668 }
4669 free_rbufs(info, start, end);
4670 return true;
4671
4672cleanup:
4673 return false;
4674}
4675
4676/*
4677 * pass receive buffer (RAW synchronous mode) to tty layer
4678 * return true if buffer available, otherwise false
4679 */
4680static bool rx_get_buf(struct slgt_info *info)
4681{
4682 unsigned int i = info->rbuf_current;
4683 unsigned int count;
4684
4685 if (!desc_complete(info->rbufs[i]))
4686 return false;
4687 count = desc_count(info->rbufs[i]);
4688 switch(info->params.mode) {
4689 case MGSL_MODE_MONOSYNC:
4690 case MGSL_MODE_BISYNC:
4691 case MGSL_MODE_XSYNC:
4692 /* ignore residue in byte synchronous modes */
4693 if (desc_residue(info->rbufs[i]))
4694 count--;
4695 break;
4696 }
4697 DBGDATA(info, info->rbufs[i].buf, count, "rx");
4698 DBGINFO(("rx_get_buf size=%d\n", count));
4699 if (count)
4700 ldisc_receive_buf(info->port.tty, info->rbufs[i].buf,
4701 info->flag_buf, count);
4702 free_rbufs(info, i, i);
4703 return true;
4704}
4705
4706static void reset_tbufs(struct slgt_info *info)
4707{
4708 unsigned int i;
4709 info->tbuf_current = 0;
4710 for (i=0 ; i < info->tbuf_count ; i++) {
4711 info->tbufs[i].status = 0;
4712 info->tbufs[i].count = 0;
4713 }
4714}
4715
4716/*
4717 * return number of free transmit DMA buffers
4718 */
4719static unsigned int free_tbuf_count(struct slgt_info *info)
4720{
4721 unsigned int count = 0;
4722 unsigned int i = info->tbuf_current;
4723
4724 do
4725 {
4726 if (desc_count(info->tbufs[i]))
4727 break; /* buffer in use */
4728 ++count;
4729 if (++i == info->tbuf_count)
4730 i=0;
4731 } while (i != info->tbuf_current);
4732
4733 /* if tx DMA active, last zero count buffer is in use */
4734 if (count && (rd_reg32(info, TDCSR) & BIT0))
4735 --count;
4736
4737 return count;
4738}
4739
4740/*
4741 * return number of bytes in unsent transmit DMA buffers
4742 * and the serial controller tx FIFO
4743 */
4744static unsigned int tbuf_bytes(struct slgt_info *info)
4745{
4746 unsigned int total_count = 0;
4747 unsigned int i = info->tbuf_current;
4748 unsigned int reg_value;
4749 unsigned int count;
4750 unsigned int active_buf_count = 0;
4751
4752 /*
4753 * Add descriptor counts for all tx DMA buffers.
4754 * If count is zero (cleared by DMA controller after read),
4755 * the buffer is complete or is actively being read from.
4756 *
4757 * Record buf_count of last buffer with zero count starting
4758 * from current ring position. buf_count is mirror
4759 * copy of count and is not cleared by serial controller.
4760 * If DMA controller is active, that buffer is actively
4761 * being read so add to total.
4762 */
4763 do {
4764 count = desc_count(info->tbufs[i]);
4765 if (count)
4766 total_count += count;
4767 else if (!total_count)
4768 active_buf_count = info->tbufs[i].buf_count;
4769 if (++i == info->tbuf_count)
4770 i = 0;
4771 } while (i != info->tbuf_current);
4772
4773 /* read tx DMA status register */
4774 reg_value = rd_reg32(info, TDCSR);
4775
4776 /* if tx DMA active, last zero count buffer is in use */
4777 if (reg_value & BIT0)
4778 total_count += active_buf_count;
4779
4780 /* add tx FIFO count = reg_value[15..8] */
4781 total_count += (reg_value >> 8) & 0xff;
4782
4783 /* if transmitter active add one byte for shift register */
4784 if (info->tx_active)
4785 total_count++;
4786
4787 return total_count;
4788}
4789
4790/*
4791 * load data into transmit DMA buffer ring and start transmitter if needed
4792 * return true if data accepted, otherwise false (buffers full)
4793 */
4794static bool tx_load(struct slgt_info *info, const char *buf, unsigned int size)
4795{
4796 unsigned short count;
4797 unsigned int i;
4798 struct slgt_desc *d;
4799
4800 /* check required buffer space */
4801 if (DIV_ROUND_UP(size, DMABUFSIZE) > free_tbuf_count(info))
4802 return false;
4803
4804 DBGDATA(info, buf, size, "tx");
4805
4806 /*
4807 * copy data to one or more DMA buffers in circular ring
4808 * tbuf_start = first buffer for this data
4809 * tbuf_current = next free buffer
4810 *
4811 * Copy all data before making data visible to DMA controller by
4812 * setting descriptor count of the first buffer.
4813 * This prevents an active DMA controller from reading the first DMA
4814 * buffers of a frame and stopping before the final buffers are filled.
4815 */
4816
4817 info->tbuf_start = i = info->tbuf_current;
4818
4819 while (size) {
4820 d = &info->tbufs[i];
4821
4822 count = (unsigned short)((size > DMABUFSIZE) ? DMABUFSIZE : size);
4823 memcpy(d->buf, buf, count);
4824
4825 size -= count;
4826 buf += count;
4827
4828 /*
4829 * set EOF bit for last buffer of HDLC frame or
4830 * for every buffer in raw mode
4831 */
4832 if ((!size && info->params.mode == MGSL_MODE_HDLC) ||
4833 info->params.mode == MGSL_MODE_RAW)
4834 set_desc_eof(*d, 1);
4835 else
4836 set_desc_eof(*d, 0);
4837
4838 /* set descriptor count for all but first buffer */
4839 if (i != info->tbuf_start)
4840 set_desc_count(*d, count);
4841 d->buf_count = count;
4842
4843 if (++i == info->tbuf_count)
4844 i = 0;
4845 }
4846
4847 info->tbuf_current = i;
4848
4849 /* set first buffer count to make new data visible to DMA controller */
4850 d = &info->tbufs[info->tbuf_start];
4851 set_desc_count(*d, d->buf_count);
4852
4853 /* start transmitter if needed and update transmit timeout */
4854 if (!info->tx_active)
4855 tx_start(info);
4856 update_tx_timer(info);
4857
4858 return true;
4859}
4860
4861static int register_test(struct slgt_info *info)
4862{
4863 static unsigned short patterns[] =
4864 {0x0000, 0xffff, 0xaaaa, 0x5555, 0x6969, 0x9696};
4865 static unsigned int count = ARRAY_SIZE(patterns);
4866 unsigned int i;
4867 int rc = 0;
4868
4869 for (i=0 ; i < count ; i++) {
4870 wr_reg16(info, TIR, patterns[i]);
4871 wr_reg16(info, BDR, patterns[(i+1)%count]);
4872 if ((rd_reg16(info, TIR) != patterns[i]) ||
4873 (rd_reg16(info, BDR) != patterns[(i+1)%count])) {
4874 rc = -ENODEV;
4875 break;
4876 }
4877 }
4878 info->gpio_present = (rd_reg32(info, JCR) & BIT5) ? 1 : 0;
4879 info->init_error = rc ? 0 : DiagStatus_AddressFailure;
4880 return rc;
4881}
4882
4883static int irq_test(struct slgt_info *info)
4884{
4885 unsigned long timeout;
4886 unsigned long flags;
4887 struct tty_struct *oldtty = info->port.tty;
4888 u32 speed = info->params.data_rate;
4889
4890 info->params.data_rate = 921600;
4891 info->port.tty = NULL;
4892
4893 spin_lock_irqsave(&info->lock, flags);
4894 async_mode(info);
4895 slgt_irq_on(info, IRQ_TXIDLE);
4896
4897 /* enable transmitter */
4898 wr_reg16(info, TCR,
4899 (unsigned short)(rd_reg16(info, TCR) | BIT1));
4900
4901 /* write one byte and wait for tx idle */
4902 wr_reg16(info, TDR, 0);
4903
4904 /* assume failure */
4905 info->init_error = DiagStatus_IrqFailure;
4906 info->irq_occurred = false;
4907
4908 spin_unlock_irqrestore(&info->lock, flags);
4909
4910 timeout=100;
4911 while(timeout-- && !info->irq_occurred)
4912 msleep_interruptible(10);
4913
4914 spin_lock_irqsave(&info->lock,flags);
4915 reset_port(info);
4916 spin_unlock_irqrestore(&info->lock,flags);
4917
4918 info->params.data_rate = speed;
4919 info->port.tty = oldtty;
4920
4921 info->init_error = info->irq_occurred ? 0 : DiagStatus_IrqFailure;
4922 return info->irq_occurred ? 0 : -ENODEV;
4923}
4924
4925static int loopback_test_rx(struct slgt_info *info)
4926{
4927 unsigned char *src, *dest;
4928 int count;
4929
4930 if (desc_complete(info->rbufs[0])) {
4931 count = desc_count(info->rbufs[0]);
4932 src = info->rbufs[0].buf;
4933 dest = info->tmp_rbuf;
4934
4935 for( ; count ; count-=2, src+=2) {
4936 /* src=data byte (src+1)=status byte */
4937 if (!(*(src+1) & (BIT9 + BIT8))) {
4938 *dest = *src;
4939 dest++;
4940 info->tmp_rbuf_count++;
4941 }
4942 }
4943 DBGDATA(info, info->tmp_rbuf, info->tmp_rbuf_count, "rx");
4944 return 1;
4945 }
4946 return 0;
4947}
4948
4949static int loopback_test(struct slgt_info *info)
4950{
4951#define TESTFRAMESIZE 20
4952
4953 unsigned long timeout;
4954 u16 count;
4955 unsigned char buf[TESTFRAMESIZE];
4956 int rc = -ENODEV;
4957 unsigned long flags;
4958
4959 struct tty_struct *oldtty = info->port.tty;
4960 MGSL_PARAMS params;
4961
4962 memcpy(¶ms, &info->params, sizeof(params));
4963
4964 info->params.mode = MGSL_MODE_ASYNC;
4965 info->params.data_rate = 921600;
4966 info->params.loopback = 1;
4967 info->port.tty = NULL;
4968
4969 /* build and send transmit frame */
4970 for (count = 0; count < TESTFRAMESIZE; ++count)
4971 buf[count] = (unsigned char)count;
4972
4973 info->tmp_rbuf_count = 0;
4974 memset(info->tmp_rbuf, 0, TESTFRAMESIZE);
4975
4976 /* program hardware for HDLC and enabled receiver */
4977 spin_lock_irqsave(&info->lock,flags);
4978 async_mode(info);
4979 rx_start(info);
4980 tx_load(info, buf, count);
4981 spin_unlock_irqrestore(&info->lock, flags);
4982
4983 /* wait for receive complete */
4984 for (timeout = 100; timeout; --timeout) {
4985 msleep_interruptible(10);
4986 if (loopback_test_rx(info)) {
4987 rc = 0;
4988 break;
4989 }
4990 }
4991
4992 /* verify received frame length and contents */
4993 if (!rc && (info->tmp_rbuf_count != count ||
4994 memcmp(buf, info->tmp_rbuf, count))) {
4995 rc = -ENODEV;
4996 }
4997
4998 spin_lock_irqsave(&info->lock,flags);
4999 reset_adapter(info);
5000 spin_unlock_irqrestore(&info->lock,flags);
5001
5002 memcpy(&info->params, ¶ms, sizeof(info->params));
5003 info->port.tty = oldtty;
5004
5005 info->init_error = rc ? DiagStatus_DmaFailure : 0;
5006 return rc;
5007}
5008
5009static int adapter_test(struct slgt_info *info)
5010{
5011 DBGINFO(("testing %s\n", info->device_name));
5012 if (register_test(info) < 0) {
5013 printk("register test failure %s addr=%08X\n",
5014 info->device_name, info->phys_reg_addr);
5015 } else if (irq_test(info) < 0) {
5016 printk("IRQ test failure %s IRQ=%d\n",
5017 info->device_name, info->irq_level);
5018 } else if (loopback_test(info) < 0) {
5019 printk("loopback test failure %s\n", info->device_name);
5020 }
5021 return info->init_error;
5022}
5023
5024/*
5025 * transmit timeout handler
5026 */
5027static void tx_timeout(struct timer_list *t)
5028{
5029 struct slgt_info *info = from_timer(info, t, tx_timer);
5030 unsigned long flags;
5031
5032 DBGINFO(("%s tx_timeout\n", info->device_name));
5033 if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5034 info->icount.txtimeout++;
5035 }
5036 spin_lock_irqsave(&info->lock,flags);
5037 tx_stop(info);
5038 spin_unlock_irqrestore(&info->lock,flags);
5039
5040#if SYNCLINK_GENERIC_HDLC
5041 if (info->netcount)
5042 hdlcdev_tx_done(info);
5043 else
5044#endif
5045 bh_transmit(info);
5046}
5047
5048/*
5049 * receive buffer polling timer
5050 */
5051static void rx_timeout(struct timer_list *t)
5052{
5053 struct slgt_info *info = from_timer(info, t, rx_timer);
5054 unsigned long flags;
5055
5056 DBGINFO(("%s rx_timeout\n", info->device_name));
5057 spin_lock_irqsave(&info->lock, flags);
5058 info->pending_bh |= BH_RECEIVE;
5059 spin_unlock_irqrestore(&info->lock, flags);
5060 bh_handler(&info->task);
5061}
5062