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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * mxser.c -- MOXA Smartio/Industio family multiport serial driver.
4 *
5 * Copyright (C) 1999-2006 Moxa Technologies (support@moxa.com).
6 * Copyright (C) 2006-2008 Jiri Slaby <jirislaby@gmail.com>
7 *
8 * This code is loosely based on the 1.8 moxa driver which is based on
9 * Linux serial driver, written by Linus Torvalds, Theodore T'so and
10 * others.
11 *
12 * Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
13 * <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
14 * www.moxa.com.
15 * - Fixed x86_64 cleanness
16 */
17
18#include <linux/module.h>
19#include <linux/errno.h>
20#include <linux/signal.h>
21#include <linux/sched.h>
22#include <linux/timer.h>
23#include <linux/interrupt.h>
24#include <linux/tty.h>
25#include <linux/tty_flip.h>
26#include <linux/serial.h>
27#include <linux/serial_reg.h>
28#include <linux/major.h>
29#include <linux/string.h>
30#include <linux/fcntl.h>
31#include <linux/ptrace.h>
32#include <linux/ioport.h>
33#include <linux/mm.h>
34#include <linux/delay.h>
35#include <linux/pci.h>
36#include <linux/bitops.h>
37#include <linux/slab.h>
38#include <linux/ratelimit.h>
39
40#include <asm/io.h>
41#include <asm/irq.h>
42#include <linux/uaccess.h>
43
44#include "mxser.h"
45
46#define MXSER_VERSION "2.0.5" /* 1.14 */
47#define MXSERMAJOR 174
48
49#define MXSER_BOARDS 4 /* Max. boards */
50#define MXSER_PORTS_PER_BOARD 8 /* Max. ports per board */
51#define MXSER_PORTS (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
52#define MXSER_ISR_PASS_LIMIT 100
53
54/*CheckIsMoxaMust return value*/
55#define MOXA_OTHER_UART 0x00
56#define MOXA_MUST_MU150_HWID 0x01
57#define MOXA_MUST_MU860_HWID 0x02
58
59#define WAKEUP_CHARS 256
60
61#define UART_MCR_AFE 0x20
62#define UART_LSR_SPECIAL 0x1E
63
64#define PCI_DEVICE_ID_POS104UL 0x1044
65#define PCI_DEVICE_ID_CB108 0x1080
66#define PCI_DEVICE_ID_CP102UF 0x1023
67#define PCI_DEVICE_ID_CP112UL 0x1120
68#define PCI_DEVICE_ID_CB114 0x1142
69#define PCI_DEVICE_ID_CP114UL 0x1143
70#define PCI_DEVICE_ID_CB134I 0x1341
71#define PCI_DEVICE_ID_CP138U 0x1380
72
73
74#define C168_ASIC_ID 1
75#define C104_ASIC_ID 2
76#define C102_ASIC_ID 0xB
77#define CI132_ASIC_ID 4
78#define CI134_ASIC_ID 3
79#define CI104J_ASIC_ID 5
80
81#define MXSER_HIGHBAUD 1
82#define MXSER_HAS2 2
83
84/* This is only for PCI */
85static const struct {
86 int type;
87 int tx_fifo;
88 int rx_fifo;
89 int xmit_fifo_size;
90 int rx_high_water;
91 int rx_trigger;
92 int rx_low_water;
93 long max_baud;
94} Gpci_uart_info[] = {
95 {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
96 {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
97 {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
98};
99#define UART_INFO_NUM ARRAY_SIZE(Gpci_uart_info)
100
101struct mxser_cardinfo {
102 char *name;
103 unsigned int nports;
104 unsigned int flags;
105};
106
107static const struct mxser_cardinfo mxser_cards[] = {
108/* 0*/ { "C168 series", 8, },
109 { "C104 series", 4, },
110 { "CI-104J series", 4, },
111 { "C168H/PCI series", 8, },
112 { "C104H/PCI series", 4, },
113/* 5*/ { "C102 series", 4, MXSER_HAS2 }, /* C102-ISA */
114 { "CI-132 series", 4, MXSER_HAS2 },
115 { "CI-134 series", 4, },
116 { "CP-132 series", 2, },
117 { "CP-114 series", 4, },
118/*10*/ { "CT-114 series", 4, },
119 { "CP-102 series", 2, MXSER_HIGHBAUD },
120 { "CP-104U series", 4, },
121 { "CP-168U series", 8, },
122 { "CP-132U series", 2, },
123/*15*/ { "CP-134U series", 4, },
124 { "CP-104JU series", 4, },
125 { "Moxa UC7000 Serial", 8, }, /* RC7000 */
126 { "CP-118U series", 8, },
127 { "CP-102UL series", 2, },
128/*20*/ { "CP-102U series", 2, },
129 { "CP-118EL series", 8, },
130 { "CP-168EL series", 8, },
131 { "CP-104EL series", 4, },
132 { "CB-108 series", 8, },
133/*25*/ { "CB-114 series", 4, },
134 { "CB-134I series", 4, },
135 { "CP-138U series", 8, },
136 { "POS-104UL series", 4, },
137 { "CP-114UL series", 4, },
138/*30*/ { "CP-102UF series", 2, },
139 { "CP-112UL series", 2, },
140};
141
142/* driver_data correspond to the lines in the structure above
143 see also ISA probe function before you change something */
144static const struct pci_device_id mxser_pcibrds[] = {
145 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168), .driver_data = 3 },
146 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104), .driver_data = 4 },
147 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132), .driver_data = 8 },
148 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114), .driver_data = 9 },
149 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114), .driver_data = 10 },
150 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102), .driver_data = 11 },
151 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
152 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
153 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
154 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
155 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
156 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
157 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
158 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
159 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
160 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
161 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
162 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
163 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108), .driver_data = 24 },
164 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114), .driver_data = 25 },
165 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I), .driver_data = 26 },
166 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U), .driver_data = 27 },
167 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL), .driver_data = 28 },
168 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL), .driver_data = 29 },
169 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF), .driver_data = 30 },
170 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL), .driver_data = 31 },
171 { }
172};
173MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
174
175static unsigned long ioaddr[MXSER_BOARDS];
176static int ttymajor = MXSERMAJOR;
177
178/* Variables for insmod */
179
180MODULE_AUTHOR("Casper Yang");
181MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
182module_param_hw_array(ioaddr, ulong, ioport, NULL, 0);
183MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
184module_param(ttymajor, int, 0);
185MODULE_LICENSE("GPL");
186
187struct mxser_log {
188 int tick;
189 unsigned long rxcnt[MXSER_PORTS];
190 unsigned long txcnt[MXSER_PORTS];
191};
192
193struct mxser_mon {
194 unsigned long rxcnt;
195 unsigned long txcnt;
196 unsigned long up_rxcnt;
197 unsigned long up_txcnt;
198 int modem_status;
199 unsigned char hold_reason;
200};
201
202struct mxser_mon_ext {
203 unsigned long rx_cnt[32];
204 unsigned long tx_cnt[32];
205 unsigned long up_rxcnt[32];
206 unsigned long up_txcnt[32];
207 int modem_status[32];
208
209 long baudrate[32];
210 int databits[32];
211 int stopbits[32];
212 int parity[32];
213 int flowctrl[32];
214 int fifo[32];
215 int iftype[32];
216};
217
218struct mxser_board;
219
220struct mxser_port {
221 struct tty_port port;
222 struct mxser_board *board;
223
224 unsigned long ioaddr;
225 unsigned long opmode_ioaddr;
226 int max_baud;
227
228 int rx_high_water;
229 int rx_trigger; /* Rx fifo trigger level */
230 int rx_low_water;
231 int baud_base; /* max. speed */
232 int type; /* UART type */
233
234 int x_char; /* xon/xoff character */
235 int IER; /* Interrupt Enable Register */
236 int MCR; /* Modem control register */
237
238 unsigned char stop_rx;
239 unsigned char ldisc_stop_rx;
240
241 int custom_divisor;
242 unsigned char err_shadow;
243
244 struct async_icount icount; /* kernel counters for 4 input interrupts */
245 unsigned int timeout;
246
247 int read_status_mask;
248 int ignore_status_mask;
249 unsigned int xmit_fifo_size;
250 int xmit_head;
251 int xmit_tail;
252 int xmit_cnt;
253 int closing;
254
255 struct ktermios normal_termios;
256
257 struct mxser_mon mon_data;
258
259 spinlock_t slock;
260};
261
262struct mxser_board {
263 unsigned int idx;
264 int irq;
265 const struct mxser_cardinfo *info;
266 unsigned long vector;
267 unsigned long vector_mask;
268
269 int chip_flag;
270 int uart_type;
271
272 struct mxser_port ports[MXSER_PORTS_PER_BOARD];
273};
274
275struct mxser_mstatus {
276 tcflag_t cflag;
277 int cts;
278 int dsr;
279 int ri;
280 int dcd;
281};
282
283static struct mxser_board mxser_boards[MXSER_BOARDS];
284static struct tty_driver *mxvar_sdriver;
285static struct mxser_log mxvar_log;
286static int mxser_set_baud_method[MXSER_PORTS + 1];
287
288static void mxser_enable_must_enchance_mode(unsigned long baseio)
289{
290 u8 oldlcr;
291 u8 efr;
292
293 oldlcr = inb(baseio + UART_LCR);
294 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
295
296 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
297 efr |= MOXA_MUST_EFR_EFRB_ENABLE;
298
299 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
300 outb(oldlcr, baseio + UART_LCR);
301}
302
303#ifdef CONFIG_PCI
304static void mxser_disable_must_enchance_mode(unsigned long baseio)
305{
306 u8 oldlcr;
307 u8 efr;
308
309 oldlcr = inb(baseio + UART_LCR);
310 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
311
312 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
313 efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
314
315 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
316 outb(oldlcr, baseio + UART_LCR);
317}
318#endif
319
320static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
321{
322 u8 oldlcr;
323 u8 efr;
324
325 oldlcr = inb(baseio + UART_LCR);
326 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
327
328 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
329 efr &= ~MOXA_MUST_EFR_BANK_MASK;
330 efr |= MOXA_MUST_EFR_BANK0;
331
332 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
333 outb(value, baseio + MOXA_MUST_XON1_REGISTER);
334 outb(oldlcr, baseio + UART_LCR);
335}
336
337static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
338{
339 u8 oldlcr;
340 u8 efr;
341
342 oldlcr = inb(baseio + UART_LCR);
343 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
344
345 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
346 efr &= ~MOXA_MUST_EFR_BANK_MASK;
347 efr |= MOXA_MUST_EFR_BANK0;
348
349 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
350 outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
351 outb(oldlcr, baseio + UART_LCR);
352}
353
354static void mxser_set_must_fifo_value(struct mxser_port *info)
355{
356 u8 oldlcr;
357 u8 efr;
358
359 oldlcr = inb(info->ioaddr + UART_LCR);
360 outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
361
362 efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
363 efr &= ~MOXA_MUST_EFR_BANK_MASK;
364 efr |= MOXA_MUST_EFR_BANK1;
365
366 outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
367 outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
368 outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
369 outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
370 outb(oldlcr, info->ioaddr + UART_LCR);
371}
372
373static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
374{
375 u8 oldlcr;
376 u8 efr;
377
378 oldlcr = inb(baseio + UART_LCR);
379 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
380
381 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
382 efr &= ~MOXA_MUST_EFR_BANK_MASK;
383 efr |= MOXA_MUST_EFR_BANK2;
384
385 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
386 outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
387 outb(oldlcr, baseio + UART_LCR);
388}
389
390#ifdef CONFIG_PCI
391static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
392{
393 u8 oldlcr;
394 u8 efr;
395
396 oldlcr = inb(baseio + UART_LCR);
397 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
398
399 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
400 efr &= ~MOXA_MUST_EFR_BANK_MASK;
401 efr |= MOXA_MUST_EFR_BANK2;
402
403 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
404 *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
405 outb(oldlcr, baseio + UART_LCR);
406}
407#endif
408
409static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
410{
411 u8 oldlcr;
412 u8 efr;
413
414 oldlcr = inb(baseio + UART_LCR);
415 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
416
417 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
418 efr &= ~MOXA_MUST_EFR_SF_MASK;
419
420 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
421 outb(oldlcr, baseio + UART_LCR);
422}
423
424static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
425{
426 u8 oldlcr;
427 u8 efr;
428
429 oldlcr = inb(baseio + UART_LCR);
430 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
431
432 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
433 efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
434 efr |= MOXA_MUST_EFR_SF_TX1;
435
436 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
437 outb(oldlcr, baseio + UART_LCR);
438}
439
440static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
441{
442 u8 oldlcr;
443 u8 efr;
444
445 oldlcr = inb(baseio + UART_LCR);
446 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
447
448 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
449 efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
450
451 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
452 outb(oldlcr, baseio + UART_LCR);
453}
454
455static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
456{
457 u8 oldlcr;
458 u8 efr;
459
460 oldlcr = inb(baseio + UART_LCR);
461 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
462
463 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
464 efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
465 efr |= MOXA_MUST_EFR_SF_RX1;
466
467 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
468 outb(oldlcr, baseio + UART_LCR);
469}
470
471static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
472{
473 u8 oldlcr;
474 u8 efr;
475
476 oldlcr = inb(baseio + UART_LCR);
477 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
478
479 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
480 efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
481
482 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
483 outb(oldlcr, baseio + UART_LCR);
484}
485
486#ifdef CONFIG_PCI
487static int CheckIsMoxaMust(unsigned long io)
488{
489 u8 oldmcr, hwid;
490 int i;
491
492 outb(0, io + UART_LCR);
493 mxser_disable_must_enchance_mode(io);
494 oldmcr = inb(io + UART_MCR);
495 outb(0, io + UART_MCR);
496 mxser_set_must_xon1_value(io, 0x11);
497 if ((hwid = inb(io + UART_MCR)) != 0) {
498 outb(oldmcr, io + UART_MCR);
499 return MOXA_OTHER_UART;
500 }
501
502 mxser_get_must_hardware_id(io, &hwid);
503 for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
504 if (hwid == Gpci_uart_info[i].type)
505 return (int)hwid;
506 }
507 return MOXA_OTHER_UART;
508}
509#endif
510
511static void process_txrx_fifo(struct mxser_port *info)
512{
513 int i;
514
515 if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
516 info->rx_trigger = 1;
517 info->rx_high_water = 1;
518 info->rx_low_water = 1;
519 info->xmit_fifo_size = 1;
520 } else
521 for (i = 0; i < UART_INFO_NUM; i++)
522 if (info->board->chip_flag == Gpci_uart_info[i].type) {
523 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
524 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
525 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
526 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
527 break;
528 }
529}
530
531static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
532{
533 static unsigned char mxser_msr[MXSER_PORTS + 1];
534 unsigned char status = 0;
535
536 status = inb(baseaddr + UART_MSR);
537
538 mxser_msr[port] &= 0x0F;
539 mxser_msr[port] |= status;
540 status = mxser_msr[port];
541 if (mode)
542 mxser_msr[port] = 0;
543
544 return status;
545}
546
547static int mxser_carrier_raised(struct tty_port *port)
548{
549 struct mxser_port *mp = container_of(port, struct mxser_port, port);
550 return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
551}
552
553static void mxser_dtr_rts(struct tty_port *port, int on)
554{
555 struct mxser_port *mp = container_of(port, struct mxser_port, port);
556 unsigned long flags;
557
558 spin_lock_irqsave(&mp->slock, flags);
559 if (on)
560 outb(inb(mp->ioaddr + UART_MCR) |
561 UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
562 else
563 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
564 mp->ioaddr + UART_MCR);
565 spin_unlock_irqrestore(&mp->slock, flags);
566}
567
568static int mxser_set_baud(struct tty_struct *tty, long newspd)
569{
570 struct mxser_port *info = tty->driver_data;
571 unsigned int quot = 0, baud;
572 unsigned char cval;
573 u64 timeout;
574
575 if (!info->ioaddr)
576 return -1;
577
578 if (newspd > info->max_baud)
579 return -1;
580
581 if (newspd == 134) {
582 quot = 2 * info->baud_base / 269;
583 tty_encode_baud_rate(tty, 134, 134);
584 } else if (newspd) {
585 quot = info->baud_base / newspd;
586 if (quot == 0)
587 quot = 1;
588 baud = info->baud_base/quot;
589 tty_encode_baud_rate(tty, baud, baud);
590 } else {
591 quot = 0;
592 }
593
594 /*
595 * worst case (128 * 1000 * 10 * 18432) needs 35 bits, so divide in the
596 * u64 domain
597 */
598 timeout = (u64)info->xmit_fifo_size * HZ * 10 * quot;
599 do_div(timeout, info->baud_base);
600 info->timeout = timeout + HZ / 50; /* Add .02 seconds of slop */
601
602 if (quot) {
603 info->MCR |= UART_MCR_DTR;
604 outb(info->MCR, info->ioaddr + UART_MCR);
605 } else {
606 info->MCR &= ~UART_MCR_DTR;
607 outb(info->MCR, info->ioaddr + UART_MCR);
608 return 0;
609 }
610
611 cval = inb(info->ioaddr + UART_LCR);
612
613 outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR); /* set DLAB */
614
615 outb(quot & 0xff, info->ioaddr + UART_DLL); /* LS of divisor */
616 outb(quot >> 8, info->ioaddr + UART_DLM); /* MS of divisor */
617 outb(cval, info->ioaddr + UART_LCR); /* reset DLAB */
618
619#ifdef BOTHER
620 if (C_BAUD(tty) == BOTHER) {
621 quot = info->baud_base % newspd;
622 quot *= 8;
623 if (quot % newspd > newspd / 2) {
624 quot /= newspd;
625 quot++;
626 } else
627 quot /= newspd;
628
629 mxser_set_must_enum_value(info->ioaddr, quot);
630 } else
631#endif
632 mxser_set_must_enum_value(info->ioaddr, 0);
633
634 return 0;
635}
636
637/*
638 * This routine is called to set the UART divisor registers to match
639 * the specified baud rate for a serial port.
640 */
641static void mxser_change_speed(struct tty_struct *tty)
642{
643 struct mxser_port *info = tty->driver_data;
644 unsigned cflag, cval, fcr;
645 unsigned char status;
646
647 cflag = tty->termios.c_cflag;
648 if (!info->ioaddr)
649 return;
650
651 if (mxser_set_baud_method[tty->index] == 0)
652 mxser_set_baud(tty, tty_get_baud_rate(tty));
653
654 /* byte size and parity */
655 switch (cflag & CSIZE) {
656 case CS5:
657 cval = 0x00;
658 break;
659 case CS6:
660 cval = 0x01;
661 break;
662 case CS7:
663 cval = 0x02;
664 break;
665 case CS8:
666 cval = 0x03;
667 break;
668 default:
669 cval = 0x00;
670 break; /* too keep GCC shut... */
671 }
672 if (cflag & CSTOPB)
673 cval |= 0x04;
674 if (cflag & PARENB)
675 cval |= UART_LCR_PARITY;
676 if (!(cflag & PARODD))
677 cval |= UART_LCR_EPAR;
678 if (cflag & CMSPAR)
679 cval |= UART_LCR_SPAR;
680
681 if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
682 if (info->board->chip_flag) {
683 fcr = UART_FCR_ENABLE_FIFO;
684 fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
685 mxser_set_must_fifo_value(info);
686 } else
687 fcr = 0;
688 } else {
689 fcr = UART_FCR_ENABLE_FIFO;
690 if (info->board->chip_flag) {
691 fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
692 mxser_set_must_fifo_value(info);
693 } else {
694 switch (info->rx_trigger) {
695 case 1:
696 fcr |= UART_FCR_TRIGGER_1;
697 break;
698 case 4:
699 fcr |= UART_FCR_TRIGGER_4;
700 break;
701 case 8:
702 fcr |= UART_FCR_TRIGGER_8;
703 break;
704 default:
705 fcr |= UART_FCR_TRIGGER_14;
706 break;
707 }
708 }
709 }
710
711 /* CTS flow control flag and modem status interrupts */
712 info->IER &= ~UART_IER_MSI;
713 info->MCR &= ~UART_MCR_AFE;
714 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
715 if (cflag & CRTSCTS) {
716 info->IER |= UART_IER_MSI;
717 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
718 info->MCR |= UART_MCR_AFE;
719 } else {
720 status = inb(info->ioaddr + UART_MSR);
721 if (tty->hw_stopped) {
722 if (status & UART_MSR_CTS) {
723 tty->hw_stopped = 0;
724 if (info->type != PORT_16550A &&
725 !info->board->chip_flag) {
726 outb(info->IER & ~UART_IER_THRI,
727 info->ioaddr +
728 UART_IER);
729 info->IER |= UART_IER_THRI;
730 outb(info->IER, info->ioaddr +
731 UART_IER);
732 }
733 tty_wakeup(tty);
734 }
735 } else {
736 if (!(status & UART_MSR_CTS)) {
737 tty->hw_stopped = 1;
738 if ((info->type != PORT_16550A) &&
739 (!info->board->chip_flag)) {
740 info->IER &= ~UART_IER_THRI;
741 outb(info->IER, info->ioaddr +
742 UART_IER);
743 }
744 }
745 }
746 }
747 }
748 outb(info->MCR, info->ioaddr + UART_MCR);
749 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
750 if (~cflag & CLOCAL)
751 info->IER |= UART_IER_MSI;
752 outb(info->IER, info->ioaddr + UART_IER);
753
754 /*
755 * Set up parity check flag
756 */
757 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
758 if (I_INPCK(tty))
759 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
760 if (I_BRKINT(tty) || I_PARMRK(tty))
761 info->read_status_mask |= UART_LSR_BI;
762
763 info->ignore_status_mask = 0;
764
765 if (I_IGNBRK(tty)) {
766 info->ignore_status_mask |= UART_LSR_BI;
767 info->read_status_mask |= UART_LSR_BI;
768 /*
769 * If we're ignore parity and break indicators, ignore
770 * overruns too. (For real raw support).
771 */
772 if (I_IGNPAR(tty)) {
773 info->ignore_status_mask |=
774 UART_LSR_OE |
775 UART_LSR_PE |
776 UART_LSR_FE;
777 info->read_status_mask |=
778 UART_LSR_OE |
779 UART_LSR_PE |
780 UART_LSR_FE;
781 }
782 }
783 if (info->board->chip_flag) {
784 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
785 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
786 if (I_IXON(tty)) {
787 mxser_enable_must_rx_software_flow_control(
788 info->ioaddr);
789 } else {
790 mxser_disable_must_rx_software_flow_control(
791 info->ioaddr);
792 }
793 if (I_IXOFF(tty)) {
794 mxser_enable_must_tx_software_flow_control(
795 info->ioaddr);
796 } else {
797 mxser_disable_must_tx_software_flow_control(
798 info->ioaddr);
799 }
800 }
801
802
803 outb(fcr, info->ioaddr + UART_FCR); /* set fcr */
804 outb(cval, info->ioaddr + UART_LCR);
805}
806
807static void mxser_check_modem_status(struct tty_struct *tty,
808 struct mxser_port *port, int status)
809{
810 /* update input line counters */
811 if (status & UART_MSR_TERI)
812 port->icount.rng++;
813 if (status & UART_MSR_DDSR)
814 port->icount.dsr++;
815 if (status & UART_MSR_DDCD)
816 port->icount.dcd++;
817 if (status & UART_MSR_DCTS)
818 port->icount.cts++;
819 port->mon_data.modem_status = status;
820 wake_up_interruptible(&port->port.delta_msr_wait);
821
822 if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
823 if (status & UART_MSR_DCD)
824 wake_up_interruptible(&port->port.open_wait);
825 }
826
827 if (tty_port_cts_enabled(&port->port)) {
828 if (tty->hw_stopped) {
829 if (status & UART_MSR_CTS) {
830 tty->hw_stopped = 0;
831
832 if ((port->type != PORT_16550A) &&
833 (!port->board->chip_flag)) {
834 outb(port->IER & ~UART_IER_THRI,
835 port->ioaddr + UART_IER);
836 port->IER |= UART_IER_THRI;
837 outb(port->IER, port->ioaddr +
838 UART_IER);
839 }
840 tty_wakeup(tty);
841 }
842 } else {
843 if (!(status & UART_MSR_CTS)) {
844 tty->hw_stopped = 1;
845 if (port->type != PORT_16550A &&
846 !port->board->chip_flag) {
847 port->IER &= ~UART_IER_THRI;
848 outb(port->IER, port->ioaddr +
849 UART_IER);
850 }
851 }
852 }
853 }
854}
855
856static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
857{
858 struct mxser_port *info = container_of(port, struct mxser_port, port);
859 unsigned long page;
860 unsigned long flags;
861
862 page = __get_free_page(GFP_KERNEL);
863 if (!page)
864 return -ENOMEM;
865
866 spin_lock_irqsave(&info->slock, flags);
867
868 if (!info->ioaddr || !info->type) {
869 set_bit(TTY_IO_ERROR, &tty->flags);
870 free_page(page);
871 spin_unlock_irqrestore(&info->slock, flags);
872 return 0;
873 }
874 info->port.xmit_buf = (unsigned char *) page;
875
876 /*
877 * Clear the FIFO buffers and disable them
878 * (they will be reenabled in mxser_change_speed())
879 */
880 if (info->board->chip_flag)
881 outb((UART_FCR_CLEAR_RCVR |
882 UART_FCR_CLEAR_XMIT |
883 MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
884 else
885 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
886 info->ioaddr + UART_FCR);
887
888 /*
889 * At this point there's no way the LSR could still be 0xFF;
890 * if it is, then bail out, because there's likely no UART
891 * here.
892 */
893 if (inb(info->ioaddr + UART_LSR) == 0xff) {
894 spin_unlock_irqrestore(&info->slock, flags);
895 if (capable(CAP_SYS_ADMIN)) {
896 set_bit(TTY_IO_ERROR, &tty->flags);
897 return 0;
898 } else
899 return -ENODEV;
900 }
901
902 /*
903 * Clear the interrupt registers.
904 */
905 (void) inb(info->ioaddr + UART_LSR);
906 (void) inb(info->ioaddr + UART_RX);
907 (void) inb(info->ioaddr + UART_IIR);
908 (void) inb(info->ioaddr + UART_MSR);
909
910 /*
911 * Now, initialize the UART
912 */
913 outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR); /* reset DLAB */
914 info->MCR = UART_MCR_DTR | UART_MCR_RTS;
915 outb(info->MCR, info->ioaddr + UART_MCR);
916
917 /*
918 * Finally, enable interrupts
919 */
920 info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
921
922 if (info->board->chip_flag)
923 info->IER |= MOXA_MUST_IER_EGDAI;
924 outb(info->IER, info->ioaddr + UART_IER); /* enable interrupts */
925
926 /*
927 * And clear the interrupt registers again for luck.
928 */
929 (void) inb(info->ioaddr + UART_LSR);
930 (void) inb(info->ioaddr + UART_RX);
931 (void) inb(info->ioaddr + UART_IIR);
932 (void) inb(info->ioaddr + UART_MSR);
933
934 clear_bit(TTY_IO_ERROR, &tty->flags);
935 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
936
937 /*
938 * and set the speed of the serial port
939 */
940 mxser_change_speed(tty);
941 spin_unlock_irqrestore(&info->slock, flags);
942
943 return 0;
944}
945
946/*
947 * This routine will shutdown a serial port
948 */
949static void mxser_shutdown_port(struct tty_port *port)
950{
951 struct mxser_port *info = container_of(port, struct mxser_port, port);
952 unsigned long flags;
953
954 spin_lock_irqsave(&info->slock, flags);
955
956 /*
957 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
958 * here so the queue might never be waken up
959 */
960 wake_up_interruptible(&info->port.delta_msr_wait);
961
962 /*
963 * Free the xmit buffer, if necessary
964 */
965 if (info->port.xmit_buf) {
966 free_page((unsigned long) info->port.xmit_buf);
967 info->port.xmit_buf = NULL;
968 }
969
970 info->IER = 0;
971 outb(0x00, info->ioaddr + UART_IER);
972
973 /* clear Rx/Tx FIFO's */
974 if (info->board->chip_flag)
975 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
976 MOXA_MUST_FCR_GDA_MODE_ENABLE,
977 info->ioaddr + UART_FCR);
978 else
979 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
980 info->ioaddr + UART_FCR);
981
982 /* read data port to reset things */
983 (void) inb(info->ioaddr + UART_RX);
984
985
986 if (info->board->chip_flag)
987 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
988
989 spin_unlock_irqrestore(&info->slock, flags);
990}
991
992/*
993 * This routine is called whenever a serial port is opened. It
994 * enables interrupts for a serial port, linking in its async structure into
995 * the IRQ chain. It also performs the serial-specific
996 * initialization for the tty structure.
997 */
998static int mxser_open(struct tty_struct *tty, struct file *filp)
999{
1000 struct mxser_port *info;
1001 int line;
1002
1003 line = tty->index;
1004 if (line == MXSER_PORTS)
1005 return 0;
1006 info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1007 if (!info->ioaddr)
1008 return -ENODEV;
1009
1010 tty->driver_data = info;
1011 return tty_port_open(&info->port, tty, filp);
1012}
1013
1014static void mxser_flush_buffer(struct tty_struct *tty)
1015{
1016 struct mxser_port *info = tty->driver_data;
1017 char fcr;
1018 unsigned long flags;
1019
1020
1021 spin_lock_irqsave(&info->slock, flags);
1022 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1023
1024 fcr = inb(info->ioaddr + UART_FCR);
1025 outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1026 info->ioaddr + UART_FCR);
1027 outb(fcr, info->ioaddr + UART_FCR);
1028
1029 spin_unlock_irqrestore(&info->slock, flags);
1030
1031 tty_wakeup(tty);
1032}
1033
1034
1035static void mxser_close_port(struct tty_port *port)
1036{
1037 struct mxser_port *info = container_of(port, struct mxser_port, port);
1038 unsigned long timeout;
1039 /*
1040 * At this point we stop accepting input. To do this, we
1041 * disable the receive line status interrupts, and tell the
1042 * interrupt driver to stop checking the data ready bit in the
1043 * line status register.
1044 */
1045 info->IER &= ~UART_IER_RLSI;
1046 if (info->board->chip_flag)
1047 info->IER &= ~MOXA_MUST_RECV_ISR;
1048
1049 outb(info->IER, info->ioaddr + UART_IER);
1050 /*
1051 * Before we drop DTR, make sure the UART transmitter
1052 * has completely drained; this is especially
1053 * important if there is a transmit FIFO!
1054 */
1055 timeout = jiffies + HZ;
1056 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1057 schedule_timeout_interruptible(5);
1058 if (time_after(jiffies, timeout))
1059 break;
1060 }
1061}
1062
1063/*
1064 * This routine is called when the serial port gets closed. First, we
1065 * wait for the last remaining data to be sent. Then, we unlink its
1066 * async structure from the interrupt chain if necessary, and we free
1067 * that IRQ if nothing is left in the chain.
1068 */
1069static void mxser_close(struct tty_struct *tty, struct file *filp)
1070{
1071 struct mxser_port *info = tty->driver_data;
1072 struct tty_port *port = &info->port;
1073
1074 if (tty->index == MXSER_PORTS || info == NULL)
1075 return;
1076 if (tty_port_close_start(port, tty, filp) == 0)
1077 return;
1078 info->closing = 1;
1079 mutex_lock(&port->mutex);
1080 mxser_close_port(port);
1081 mxser_flush_buffer(tty);
1082 if (tty_port_initialized(port) && C_HUPCL(tty))
1083 tty_port_lower_dtr_rts(port);
1084 mxser_shutdown_port(port);
1085 tty_port_set_initialized(port, 0);
1086 mutex_unlock(&port->mutex);
1087 info->closing = 0;
1088 /* Right now the tty_port set is done outside of the close_end helper
1089 as we don't yet have everyone using refcounts */
1090 tty_port_close_end(port, tty);
1091 tty_port_tty_set(port, NULL);
1092}
1093
1094static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1095{
1096 int c, total = 0;
1097 struct mxser_port *info = tty->driver_data;
1098 unsigned long flags;
1099
1100 if (!info->port.xmit_buf)
1101 return 0;
1102
1103 while (1) {
1104 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1105 SERIAL_XMIT_SIZE - info->xmit_head));
1106 if (c <= 0)
1107 break;
1108
1109 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1110 spin_lock_irqsave(&info->slock, flags);
1111 info->xmit_head = (info->xmit_head + c) &
1112 (SERIAL_XMIT_SIZE - 1);
1113 info->xmit_cnt += c;
1114 spin_unlock_irqrestore(&info->slock, flags);
1115
1116 buf += c;
1117 count -= c;
1118 total += c;
1119 }
1120
1121 if (info->xmit_cnt && !tty->stopped) {
1122 if (!tty->hw_stopped ||
1123 (info->type == PORT_16550A) ||
1124 (info->board->chip_flag)) {
1125 spin_lock_irqsave(&info->slock, flags);
1126 outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1127 UART_IER);
1128 info->IER |= UART_IER_THRI;
1129 outb(info->IER, info->ioaddr + UART_IER);
1130 spin_unlock_irqrestore(&info->slock, flags);
1131 }
1132 }
1133 return total;
1134}
1135
1136static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1137{
1138 struct mxser_port *info = tty->driver_data;
1139 unsigned long flags;
1140
1141 if (!info->port.xmit_buf)
1142 return 0;
1143
1144 if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1145 return 0;
1146
1147 spin_lock_irqsave(&info->slock, flags);
1148 info->port.xmit_buf[info->xmit_head++] = ch;
1149 info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1150 info->xmit_cnt++;
1151 spin_unlock_irqrestore(&info->slock, flags);
1152 if (!tty->stopped) {
1153 if (!tty->hw_stopped ||
1154 (info->type == PORT_16550A) ||
1155 info->board->chip_flag) {
1156 spin_lock_irqsave(&info->slock, flags);
1157 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1158 info->IER |= UART_IER_THRI;
1159 outb(info->IER, info->ioaddr + UART_IER);
1160 spin_unlock_irqrestore(&info->slock, flags);
1161 }
1162 }
1163 return 1;
1164}
1165
1166
1167static void mxser_flush_chars(struct tty_struct *tty)
1168{
1169 struct mxser_port *info = tty->driver_data;
1170 unsigned long flags;
1171
1172 if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1173 (tty->hw_stopped && info->type != PORT_16550A &&
1174 !info->board->chip_flag))
1175 return;
1176
1177 spin_lock_irqsave(&info->slock, flags);
1178
1179 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1180 info->IER |= UART_IER_THRI;
1181 outb(info->IER, info->ioaddr + UART_IER);
1182
1183 spin_unlock_irqrestore(&info->slock, flags);
1184}
1185
1186static int mxser_write_room(struct tty_struct *tty)
1187{
1188 struct mxser_port *info = tty->driver_data;
1189 int ret;
1190
1191 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1192 return ret < 0 ? 0 : ret;
1193}
1194
1195static int mxser_chars_in_buffer(struct tty_struct *tty)
1196{
1197 struct mxser_port *info = tty->driver_data;
1198 return info->xmit_cnt;
1199}
1200
1201/*
1202 * ------------------------------------------------------------
1203 * friends of mxser_ioctl()
1204 * ------------------------------------------------------------
1205 */
1206static int mxser_get_serial_info(struct tty_struct *tty,
1207 struct serial_struct *ss)
1208{
1209 struct mxser_port *info = tty->driver_data;
1210 struct tty_port *port = &info->port;
1211
1212 if (tty->index == MXSER_PORTS)
1213 return -ENOTTY;
1214
1215 mutex_lock(&port->mutex);
1216 ss->type = info->type,
1217 ss->line = tty->index,
1218 ss->port = info->ioaddr,
1219 ss->irq = info->board->irq,
1220 ss->flags = info->port.flags,
1221 ss->baud_base = info->baud_base,
1222 ss->close_delay = info->port.close_delay,
1223 ss->closing_wait = info->port.closing_wait,
1224 ss->custom_divisor = info->custom_divisor,
1225 mutex_unlock(&port->mutex);
1226 return 0;
1227}
1228
1229static int mxser_set_serial_info(struct tty_struct *tty,
1230 struct serial_struct *ss)
1231{
1232 struct mxser_port *info = tty->driver_data;
1233 struct tty_port *port = &info->port;
1234 speed_t baud;
1235 unsigned long sl_flags;
1236 unsigned int flags;
1237 int retval = 0;
1238
1239 if (tty->index == MXSER_PORTS)
1240 return -ENOTTY;
1241 if (tty_io_error(tty))
1242 return -EIO;
1243
1244 mutex_lock(&port->mutex);
1245 if (!info->ioaddr) {
1246 mutex_unlock(&port->mutex);
1247 return -ENODEV;
1248 }
1249
1250 if (ss->irq != info->board->irq ||
1251 ss->port != info->ioaddr) {
1252 mutex_unlock(&port->mutex);
1253 return -EINVAL;
1254 }
1255
1256 flags = port->flags & ASYNC_SPD_MASK;
1257
1258 if (!capable(CAP_SYS_ADMIN)) {
1259 if ((ss->baud_base != info->baud_base) ||
1260 (ss->close_delay != info->port.close_delay) ||
1261 ((ss->flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK))) {
1262 mutex_unlock(&port->mutex);
1263 return -EPERM;
1264 }
1265 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1266 (ss->flags & ASYNC_USR_MASK));
1267 } else {
1268 /*
1269 * OK, past this point, all the error checking has been done.
1270 * At this point, we start making changes.....
1271 */
1272 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1273 (ss->flags & ASYNC_FLAGS));
1274 port->close_delay = ss->close_delay * HZ / 100;
1275 port->closing_wait = ss->closing_wait * HZ / 100;
1276 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1277 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1278 (ss->baud_base != info->baud_base ||
1279 ss->custom_divisor !=
1280 info->custom_divisor)) {
1281 if (ss->custom_divisor == 0) {
1282 mutex_unlock(&port->mutex);
1283 return -EINVAL;
1284 }
1285 baud = ss->baud_base / ss->custom_divisor;
1286 tty_encode_baud_rate(tty, baud, baud);
1287 }
1288 }
1289
1290 info->type = ss->type;
1291
1292 process_txrx_fifo(info);
1293
1294 if (tty_port_initialized(port)) {
1295 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1296 spin_lock_irqsave(&info->slock, sl_flags);
1297 mxser_change_speed(tty);
1298 spin_unlock_irqrestore(&info->slock, sl_flags);
1299 }
1300 } else {
1301 retval = mxser_activate(port, tty);
1302 if (retval == 0)
1303 tty_port_set_initialized(port, 1);
1304 }
1305 mutex_unlock(&port->mutex);
1306 return retval;
1307}
1308
1309/*
1310 * mxser_get_lsr_info - get line status register info
1311 *
1312 * Purpose: Let user call ioctl() to get info when the UART physically
1313 * is emptied. On bus types like RS485, the transmitter must
1314 * release the bus after transmitting. This must be done when
1315 * the transmit shift register is empty, not be done when the
1316 * transmit holding register is empty. This functionality
1317 * allows an RS485 driver to be written in user space.
1318 */
1319static int mxser_get_lsr_info(struct mxser_port *info,
1320 unsigned int __user *value)
1321{
1322 unsigned char status;
1323 unsigned int result;
1324 unsigned long flags;
1325
1326 spin_lock_irqsave(&info->slock, flags);
1327 status = inb(info->ioaddr + UART_LSR);
1328 spin_unlock_irqrestore(&info->slock, flags);
1329 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1330 return put_user(result, value);
1331}
1332
1333static int mxser_tiocmget(struct tty_struct *tty)
1334{
1335 struct mxser_port *info = tty->driver_data;
1336 unsigned char control, status;
1337 unsigned long flags;
1338
1339
1340 if (tty->index == MXSER_PORTS)
1341 return -ENOIOCTLCMD;
1342 if (tty_io_error(tty))
1343 return -EIO;
1344
1345 control = info->MCR;
1346
1347 spin_lock_irqsave(&info->slock, flags);
1348 status = inb(info->ioaddr + UART_MSR);
1349 if (status & UART_MSR_ANY_DELTA)
1350 mxser_check_modem_status(tty, info, status);
1351 spin_unlock_irqrestore(&info->slock, flags);
1352 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1353 ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1354 ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1355 ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1356 ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1357 ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1358}
1359
1360static int mxser_tiocmset(struct tty_struct *tty,
1361 unsigned int set, unsigned int clear)
1362{
1363 struct mxser_port *info = tty->driver_data;
1364 unsigned long flags;
1365
1366
1367 if (tty->index == MXSER_PORTS)
1368 return -ENOIOCTLCMD;
1369 if (tty_io_error(tty))
1370 return -EIO;
1371
1372 spin_lock_irqsave(&info->slock, flags);
1373
1374 if (set & TIOCM_RTS)
1375 info->MCR |= UART_MCR_RTS;
1376 if (set & TIOCM_DTR)
1377 info->MCR |= UART_MCR_DTR;
1378
1379 if (clear & TIOCM_RTS)
1380 info->MCR &= ~UART_MCR_RTS;
1381 if (clear & TIOCM_DTR)
1382 info->MCR &= ~UART_MCR_DTR;
1383
1384 outb(info->MCR, info->ioaddr + UART_MCR);
1385 spin_unlock_irqrestore(&info->slock, flags);
1386 return 0;
1387}
1388
1389static int __init mxser_program_mode(int port)
1390{
1391 int id, i, j, n;
1392
1393 outb(0, port);
1394 outb(0, port);
1395 outb(0, port);
1396 (void)inb(port);
1397 (void)inb(port);
1398 outb(0, port);
1399 (void)inb(port);
1400
1401 id = inb(port + 1) & 0x1F;
1402 if ((id != C168_ASIC_ID) &&
1403 (id != C104_ASIC_ID) &&
1404 (id != C102_ASIC_ID) &&
1405 (id != CI132_ASIC_ID) &&
1406 (id != CI134_ASIC_ID) &&
1407 (id != CI104J_ASIC_ID))
1408 return -1;
1409 for (i = 0, j = 0; i < 4; i++) {
1410 n = inb(port + 2);
1411 if (n == 'M') {
1412 j = 1;
1413 } else if ((j == 1) && (n == 1)) {
1414 j = 2;
1415 break;
1416 } else
1417 j = 0;
1418 }
1419 if (j != 2)
1420 id = -2;
1421 return id;
1422}
1423
1424static void __init mxser_normal_mode(int port)
1425{
1426 int i, n;
1427
1428 outb(0xA5, port + 1);
1429 outb(0x80, port + 3);
1430 outb(12, port + 0); /* 9600 bps */
1431 outb(0, port + 1);
1432 outb(0x03, port + 3); /* 8 data bits */
1433 outb(0x13, port + 4); /* loop back mode */
1434 for (i = 0; i < 16; i++) {
1435 n = inb(port + 5);
1436 if ((n & 0x61) == 0x60)
1437 break;
1438 if ((n & 1) == 1)
1439 (void)inb(port);
1440 }
1441 outb(0x00, port + 4);
1442}
1443
1444#define CHIP_SK 0x01 /* Serial Data Clock in Eprom */
1445#define CHIP_DO 0x02 /* Serial Data Output in Eprom */
1446#define CHIP_CS 0x04 /* Serial Chip Select in Eprom */
1447#define CHIP_DI 0x08 /* Serial Data Input in Eprom */
1448#define EN_CCMD 0x000 /* Chip's command register */
1449#define EN0_RSARLO 0x008 /* Remote start address reg 0 */
1450#define EN0_RSARHI 0x009 /* Remote start address reg 1 */
1451#define EN0_RCNTLO 0x00A /* Remote byte count reg WR */
1452#define EN0_RCNTHI 0x00B /* Remote byte count reg WR */
1453#define EN0_DCFG 0x00E /* Data configuration reg WR */
1454#define EN0_PORT 0x010 /* Rcv missed frame error counter RD */
1455#define ENC_PAGE0 0x000 /* Select page 0 of chip registers */
1456#define ENC_PAGE3 0x0C0 /* Select page 3 of chip registers */
1457static int __init mxser_read_register(int port, unsigned short *regs)
1458{
1459 int i, k, value, id;
1460 unsigned int j;
1461
1462 id = mxser_program_mode(port);
1463 if (id < 0)
1464 return id;
1465 for (i = 0; i < 14; i++) {
1466 k = (i & 0x3F) | 0x180;
1467 for (j = 0x100; j > 0; j >>= 1) {
1468 outb(CHIP_CS, port);
1469 if (k & j) {
1470 outb(CHIP_CS | CHIP_DO, port);
1471 outb(CHIP_CS | CHIP_DO | CHIP_SK, port); /* A? bit of read */
1472 } else {
1473 outb(CHIP_CS, port);
1474 outb(CHIP_CS | CHIP_SK, port); /* A? bit of read */
1475 }
1476 }
1477 (void)inb(port);
1478 value = 0;
1479 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1480 outb(CHIP_CS, port);
1481 outb(CHIP_CS | CHIP_SK, port);
1482 if (inb(port) & CHIP_DI)
1483 value |= j;
1484 }
1485 regs[i] = value;
1486 outb(0, port);
1487 }
1488 mxser_normal_mode(port);
1489 return id;
1490}
1491
1492static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1493{
1494 struct mxser_port *ip;
1495 struct tty_port *port;
1496 struct tty_struct *tty;
1497 int result, status;
1498 unsigned int i, j;
1499 int ret = 0;
1500
1501 switch (cmd) {
1502 case MOXA_GET_MAJOR:
1503 printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1504 "%x (GET_MAJOR), fix your userspace\n",
1505 current->comm, cmd);
1506 return put_user(ttymajor, (int __user *)argp);
1507
1508 case MOXA_CHKPORTENABLE:
1509 result = 0;
1510 for (i = 0; i < MXSER_BOARDS; i++)
1511 for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1512 if (mxser_boards[i].ports[j].ioaddr)
1513 result |= (1 << i);
1514 return put_user(result, (unsigned long __user *)argp);
1515 case MOXA_GETDATACOUNT:
1516 /* The receive side is locked by port->slock but it isn't
1517 clear that an exact snapshot is worth copying here */
1518 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1519 ret = -EFAULT;
1520 return ret;
1521 case MOXA_GETMSTATUS: {
1522 struct mxser_mstatus ms, __user *msu = argp;
1523 for (i = 0; i < MXSER_BOARDS; i++)
1524 for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1525 ip = &mxser_boards[i].ports[j];
1526 port = &ip->port;
1527 memset(&ms, 0, sizeof(ms));
1528
1529 mutex_lock(&port->mutex);
1530 if (!ip->ioaddr)
1531 goto copy;
1532
1533 tty = tty_port_tty_get(port);
1534
1535 if (!tty)
1536 ms.cflag = ip->normal_termios.c_cflag;
1537 else
1538 ms.cflag = tty->termios.c_cflag;
1539 tty_kref_put(tty);
1540 spin_lock_irq(&ip->slock);
1541 status = inb(ip->ioaddr + UART_MSR);
1542 spin_unlock_irq(&ip->slock);
1543 if (status & UART_MSR_DCD)
1544 ms.dcd = 1;
1545 if (status & UART_MSR_DSR)
1546 ms.dsr = 1;
1547 if (status & UART_MSR_CTS)
1548 ms.cts = 1;
1549 copy:
1550 mutex_unlock(&port->mutex);
1551 if (copy_to_user(msu, &ms, sizeof(ms)))
1552 return -EFAULT;
1553 msu++;
1554 }
1555 return 0;
1556 }
1557 case MOXA_ASPP_MON_EXT: {
1558 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1559 unsigned int cflag, iflag, p;
1560 u8 opmode;
1561
1562 me = kzalloc(sizeof(*me), GFP_KERNEL);
1563 if (!me)
1564 return -ENOMEM;
1565
1566 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1567 for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1568 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1569 i = MXSER_BOARDS;
1570 break;
1571 }
1572 ip = &mxser_boards[i].ports[j];
1573 port = &ip->port;
1574
1575 mutex_lock(&port->mutex);
1576 if (!ip->ioaddr) {
1577 mutex_unlock(&port->mutex);
1578 continue;
1579 }
1580
1581 spin_lock_irq(&ip->slock);
1582 status = mxser_get_msr(ip->ioaddr, 0, p);
1583
1584 if (status & UART_MSR_TERI)
1585 ip->icount.rng++;
1586 if (status & UART_MSR_DDSR)
1587 ip->icount.dsr++;
1588 if (status & UART_MSR_DDCD)
1589 ip->icount.dcd++;
1590 if (status & UART_MSR_DCTS)
1591 ip->icount.cts++;
1592
1593 ip->mon_data.modem_status = status;
1594 me->rx_cnt[p] = ip->mon_data.rxcnt;
1595 me->tx_cnt[p] = ip->mon_data.txcnt;
1596 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1597 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1598 me->modem_status[p] =
1599 ip->mon_data.modem_status;
1600 spin_unlock_irq(&ip->slock);
1601
1602 tty = tty_port_tty_get(&ip->port);
1603
1604 if (!tty) {
1605 cflag = ip->normal_termios.c_cflag;
1606 iflag = ip->normal_termios.c_iflag;
1607 me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1608 } else {
1609 cflag = tty->termios.c_cflag;
1610 iflag = tty->termios.c_iflag;
1611 me->baudrate[p] = tty_get_baud_rate(tty);
1612 }
1613 tty_kref_put(tty);
1614
1615 me->databits[p] = cflag & CSIZE;
1616 me->stopbits[p] = cflag & CSTOPB;
1617 me->parity[p] = cflag & (PARENB | PARODD |
1618 CMSPAR);
1619
1620 if (cflag & CRTSCTS)
1621 me->flowctrl[p] |= 0x03;
1622
1623 if (iflag & (IXON | IXOFF))
1624 me->flowctrl[p] |= 0x0C;
1625
1626 if (ip->type == PORT_16550A)
1627 me->fifo[p] = 1;
1628
1629 if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
1630 opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1631 opmode &= OP_MODE_MASK;
1632 } else {
1633 opmode = RS232_MODE;
1634 }
1635 me->iftype[p] = opmode;
1636 mutex_unlock(&port->mutex);
1637 }
1638 }
1639 if (copy_to_user(argp, me, sizeof(*me)))
1640 ret = -EFAULT;
1641 kfree(me);
1642 return ret;
1643 }
1644 default:
1645 return -ENOIOCTLCMD;
1646 }
1647 return 0;
1648}
1649
1650static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1651 struct async_icount *cprev)
1652{
1653 struct async_icount cnow;
1654 unsigned long flags;
1655 int ret;
1656
1657 spin_lock_irqsave(&info->slock, flags);
1658 cnow = info->icount; /* atomic copy */
1659 spin_unlock_irqrestore(&info->slock, flags);
1660
1661 ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1662 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1663 ((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1664 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1665
1666 *cprev = cnow;
1667
1668 return ret;
1669}
1670
1671static int mxser_ioctl(struct tty_struct *tty,
1672 unsigned int cmd, unsigned long arg)
1673{
1674 struct mxser_port *info = tty->driver_data;
1675 struct async_icount cnow;
1676 unsigned long flags;
1677 void __user *argp = (void __user *)arg;
1678
1679 if (tty->index == MXSER_PORTS)
1680 return mxser_ioctl_special(cmd, argp);
1681
1682 if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1683 int p;
1684 unsigned long opmode;
1685 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1686 int shiftbit;
1687 unsigned char val, mask;
1688
1689 if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
1690 return -EFAULT;
1691
1692 p = tty->index % 4;
1693 if (cmd == MOXA_SET_OP_MODE) {
1694 if (get_user(opmode, (int __user *) argp))
1695 return -EFAULT;
1696 if (opmode != RS232_MODE &&
1697 opmode != RS485_2WIRE_MODE &&
1698 opmode != RS422_MODE &&
1699 opmode != RS485_4WIRE_MODE)
1700 return -EFAULT;
1701 mask = ModeMask[p];
1702 shiftbit = p * 2;
1703 spin_lock_irq(&info->slock);
1704 val = inb(info->opmode_ioaddr);
1705 val &= mask;
1706 val |= (opmode << shiftbit);
1707 outb(val, info->opmode_ioaddr);
1708 spin_unlock_irq(&info->slock);
1709 } else {
1710 shiftbit = p * 2;
1711 spin_lock_irq(&info->slock);
1712 opmode = inb(info->opmode_ioaddr) >> shiftbit;
1713 spin_unlock_irq(&info->slock);
1714 opmode &= OP_MODE_MASK;
1715 if (put_user(opmode, (int __user *)argp))
1716 return -EFAULT;
1717 }
1718 return 0;
1719 }
1720
1721 if (cmd != TIOCMIWAIT && tty_io_error(tty))
1722 return -EIO;
1723
1724 switch (cmd) {
1725 case TIOCSERGETLSR: /* Get line status register */
1726 return mxser_get_lsr_info(info, argp);
1727 /*
1728 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1729 * - mask passed in arg for lines of interest
1730 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1731 * Caller should use TIOCGICOUNT to see which one it was
1732 */
1733 case TIOCMIWAIT:
1734 spin_lock_irqsave(&info->slock, flags);
1735 cnow = info->icount; /* note the counters on entry */
1736 spin_unlock_irqrestore(&info->slock, flags);
1737
1738 return wait_event_interruptible(info->port.delta_msr_wait,
1739 mxser_cflags_changed(info, arg, &cnow));
1740 case MOXA_HighSpeedOn:
1741 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1742 case MOXA_SDS_RSTICOUNTER:
1743 spin_lock_irq(&info->slock);
1744 info->mon_data.rxcnt = 0;
1745 info->mon_data.txcnt = 0;
1746 spin_unlock_irq(&info->slock);
1747 return 0;
1748
1749 case MOXA_ASPP_OQUEUE:{
1750 int len, lsr;
1751
1752 len = mxser_chars_in_buffer(tty);
1753 spin_lock_irq(&info->slock);
1754 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1755 spin_unlock_irq(&info->slock);
1756 len += (lsr ? 0 : 1);
1757
1758 return put_user(len, (int __user *)argp);
1759 }
1760 case MOXA_ASPP_MON: {
1761 int mcr, status;
1762
1763 spin_lock_irq(&info->slock);
1764 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1765 mxser_check_modem_status(tty, info, status);
1766
1767 mcr = inb(info->ioaddr + UART_MCR);
1768 spin_unlock_irq(&info->slock);
1769
1770 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1771 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1772 else
1773 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1774
1775 if (mcr & MOXA_MUST_MCR_TX_XON)
1776 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1777 else
1778 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1779
1780 if (tty->hw_stopped)
1781 info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1782 else
1783 info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1784
1785 if (copy_to_user(argp, &info->mon_data,
1786 sizeof(struct mxser_mon)))
1787 return -EFAULT;
1788
1789 return 0;
1790 }
1791 case MOXA_ASPP_LSTATUS: {
1792 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1793 return -EFAULT;
1794
1795 info->err_shadow = 0;
1796 return 0;
1797 }
1798 case MOXA_SET_BAUD_METHOD: {
1799 int method;
1800
1801 if (get_user(method, (int __user *)argp))
1802 return -EFAULT;
1803 mxser_set_baud_method[tty->index] = method;
1804 return put_user(method, (int __user *)argp);
1805 }
1806 default:
1807 return -ENOIOCTLCMD;
1808 }
1809 return 0;
1810}
1811
1812 /*
1813 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1814 * Return: write counters to the user passed counter struct
1815 * NB: both 1->0 and 0->1 transitions are counted except for
1816 * RI where only 0->1 is counted.
1817 */
1818
1819static int mxser_get_icount(struct tty_struct *tty,
1820 struct serial_icounter_struct *icount)
1821
1822{
1823 struct mxser_port *info = tty->driver_data;
1824 struct async_icount cnow;
1825 unsigned long flags;
1826
1827 spin_lock_irqsave(&info->slock, flags);
1828 cnow = info->icount;
1829 spin_unlock_irqrestore(&info->slock, flags);
1830
1831 icount->frame = cnow.frame;
1832 icount->brk = cnow.brk;
1833 icount->overrun = cnow.overrun;
1834 icount->buf_overrun = cnow.buf_overrun;
1835 icount->parity = cnow.parity;
1836 icount->rx = cnow.rx;
1837 icount->tx = cnow.tx;
1838 icount->cts = cnow.cts;
1839 icount->dsr = cnow.dsr;
1840 icount->rng = cnow.rng;
1841 icount->dcd = cnow.dcd;
1842 return 0;
1843}
1844
1845static void mxser_stoprx(struct tty_struct *tty)
1846{
1847 struct mxser_port *info = tty->driver_data;
1848
1849 info->ldisc_stop_rx = 1;
1850 if (I_IXOFF(tty)) {
1851 if (info->board->chip_flag) {
1852 info->IER &= ~MOXA_MUST_RECV_ISR;
1853 outb(info->IER, info->ioaddr + UART_IER);
1854 } else {
1855 info->x_char = STOP_CHAR(tty);
1856 outb(0, info->ioaddr + UART_IER);
1857 info->IER |= UART_IER_THRI;
1858 outb(info->IER, info->ioaddr + UART_IER);
1859 }
1860 }
1861
1862 if (C_CRTSCTS(tty)) {
1863 info->MCR &= ~UART_MCR_RTS;
1864 outb(info->MCR, info->ioaddr + UART_MCR);
1865 }
1866}
1867
1868/*
1869 * This routine is called by the upper-layer tty layer to signal that
1870 * incoming characters should be throttled.
1871 */
1872static void mxser_throttle(struct tty_struct *tty)
1873{
1874 mxser_stoprx(tty);
1875}
1876
1877static void mxser_unthrottle(struct tty_struct *tty)
1878{
1879 struct mxser_port *info = tty->driver_data;
1880
1881 /* startrx */
1882 info->ldisc_stop_rx = 0;
1883 if (I_IXOFF(tty)) {
1884 if (info->x_char)
1885 info->x_char = 0;
1886 else {
1887 if (info->board->chip_flag) {
1888 info->IER |= MOXA_MUST_RECV_ISR;
1889 outb(info->IER, info->ioaddr + UART_IER);
1890 } else {
1891 info->x_char = START_CHAR(tty);
1892 outb(0, info->ioaddr + UART_IER);
1893 info->IER |= UART_IER_THRI;
1894 outb(info->IER, info->ioaddr + UART_IER);
1895 }
1896 }
1897 }
1898
1899 if (C_CRTSCTS(tty)) {
1900 info->MCR |= UART_MCR_RTS;
1901 outb(info->MCR, info->ioaddr + UART_MCR);
1902 }
1903}
1904
1905/*
1906 * mxser_stop() and mxser_start()
1907 *
1908 * This routines are called before setting or resetting tty->stopped.
1909 * They enable or disable transmitter interrupts, as necessary.
1910 */
1911static void mxser_stop(struct tty_struct *tty)
1912{
1913 struct mxser_port *info = tty->driver_data;
1914 unsigned long flags;
1915
1916 spin_lock_irqsave(&info->slock, flags);
1917 if (info->IER & UART_IER_THRI) {
1918 info->IER &= ~UART_IER_THRI;
1919 outb(info->IER, info->ioaddr + UART_IER);
1920 }
1921 spin_unlock_irqrestore(&info->slock, flags);
1922}
1923
1924static void mxser_start(struct tty_struct *tty)
1925{
1926 struct mxser_port *info = tty->driver_data;
1927 unsigned long flags;
1928
1929 spin_lock_irqsave(&info->slock, flags);
1930 if (info->xmit_cnt && info->port.xmit_buf) {
1931 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1932 info->IER |= UART_IER_THRI;
1933 outb(info->IER, info->ioaddr + UART_IER);
1934 }
1935 spin_unlock_irqrestore(&info->slock, flags);
1936}
1937
1938static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1939{
1940 struct mxser_port *info = tty->driver_data;
1941 unsigned long flags;
1942
1943 spin_lock_irqsave(&info->slock, flags);
1944 mxser_change_speed(tty);
1945 spin_unlock_irqrestore(&info->slock, flags);
1946
1947 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1948 tty->hw_stopped = 0;
1949 mxser_start(tty);
1950 }
1951
1952 /* Handle sw stopped */
1953 if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1954 tty->stopped = 0;
1955
1956 if (info->board->chip_flag) {
1957 spin_lock_irqsave(&info->slock, flags);
1958 mxser_disable_must_rx_software_flow_control(
1959 info->ioaddr);
1960 spin_unlock_irqrestore(&info->slock, flags);
1961 }
1962
1963 mxser_start(tty);
1964 }
1965}
1966
1967/*
1968 * mxser_wait_until_sent() --- wait until the transmitter is empty
1969 */
1970static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1971{
1972 struct mxser_port *info = tty->driver_data;
1973 unsigned long orig_jiffies, char_time;
1974 unsigned long flags;
1975 int lsr;
1976
1977 if (info->type == PORT_UNKNOWN)
1978 return;
1979
1980 if (info->xmit_fifo_size == 0)
1981 return; /* Just in case.... */
1982
1983 orig_jiffies = jiffies;
1984 /*
1985 * Set the check interval to be 1/5 of the estimated time to
1986 * send a single character, and make it at least 1. The check
1987 * interval should also be less than the timeout.
1988 *
1989 * Note: we have to use pretty tight timings here to satisfy
1990 * the NIST-PCTS.
1991 */
1992 char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1993 char_time = char_time / 5;
1994 if (char_time == 0)
1995 char_time = 1;
1996 if (timeout && timeout < char_time)
1997 char_time = timeout;
1998 /*
1999 * If the transmitter hasn't cleared in twice the approximate
2000 * amount of time to send the entire FIFO, it probably won't
2001 * ever clear. This assumes the UART isn't doing flow
2002 * control, which is currently the case. Hence, if it ever
2003 * takes longer than info->timeout, this is probably due to a
2004 * UART bug of some kind. So, we clamp the timeout parameter at
2005 * 2*info->timeout.
2006 */
2007 if (!timeout || timeout > 2 * info->timeout)
2008 timeout = 2 * info->timeout;
2009
2010 spin_lock_irqsave(&info->slock, flags);
2011 while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2012 spin_unlock_irqrestore(&info->slock, flags);
2013 schedule_timeout_interruptible(char_time);
2014 spin_lock_irqsave(&info->slock, flags);
2015 if (signal_pending(current))
2016 break;
2017 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2018 break;
2019 }
2020 spin_unlock_irqrestore(&info->slock, flags);
2021 set_current_state(TASK_RUNNING);
2022}
2023
2024/*
2025 * This routine is called by tty_hangup() when a hangup is signaled.
2026 */
2027static void mxser_hangup(struct tty_struct *tty)
2028{
2029 struct mxser_port *info = tty->driver_data;
2030
2031 mxser_flush_buffer(tty);
2032 tty_port_hangup(&info->port);
2033}
2034
2035/*
2036 * mxser_rs_break() --- routine which turns the break handling on or off
2037 */
2038static int mxser_rs_break(struct tty_struct *tty, int break_state)
2039{
2040 struct mxser_port *info = tty->driver_data;
2041 unsigned long flags;
2042
2043 spin_lock_irqsave(&info->slock, flags);
2044 if (break_state == -1)
2045 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2046 info->ioaddr + UART_LCR);
2047 else
2048 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2049 info->ioaddr + UART_LCR);
2050 spin_unlock_irqrestore(&info->slock, flags);
2051 return 0;
2052}
2053
2054static void mxser_receive_chars(struct tty_struct *tty,
2055 struct mxser_port *port, int *status)
2056{
2057 unsigned char ch, gdl;
2058 int ignored = 0;
2059 int cnt = 0;
2060 int recv_room;
2061 int max = 256;
2062
2063 recv_room = tty->receive_room;
2064 if (recv_room == 0 && !port->ldisc_stop_rx)
2065 mxser_stoprx(tty);
2066 if (port->board->chip_flag != MOXA_OTHER_UART) {
2067
2068 if (*status & UART_LSR_SPECIAL)
2069 goto intr_old;
2070 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2071 (*status & MOXA_MUST_LSR_RERR))
2072 goto intr_old;
2073 if (*status & MOXA_MUST_LSR_RERR)
2074 goto intr_old;
2075
2076 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2077
2078 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2079 gdl &= MOXA_MUST_GDL_MASK;
2080 if (gdl >= recv_room) {
2081 if (!port->ldisc_stop_rx)
2082 mxser_stoprx(tty);
2083 }
2084 while (gdl--) {
2085 ch = inb(port->ioaddr + UART_RX);
2086 tty_insert_flip_char(&port->port, ch, 0);
2087 cnt++;
2088 }
2089 goto end_intr;
2090 }
2091intr_old:
2092
2093 do {
2094 if (max-- < 0)
2095 break;
2096
2097 ch = inb(port->ioaddr + UART_RX);
2098 if (port->board->chip_flag && (*status & UART_LSR_OE))
2099 outb(0x23, port->ioaddr + UART_FCR);
2100 *status &= port->read_status_mask;
2101 if (*status & port->ignore_status_mask) {
2102 if (++ignored > 100)
2103 break;
2104 } else {
2105 char flag = 0;
2106 if (*status & UART_LSR_SPECIAL) {
2107 if (*status & UART_LSR_BI) {
2108 flag = TTY_BREAK;
2109 port->icount.brk++;
2110
2111 if (port->port.flags & ASYNC_SAK)
2112 do_SAK(tty);
2113 } else if (*status & UART_LSR_PE) {
2114 flag = TTY_PARITY;
2115 port->icount.parity++;
2116 } else if (*status & UART_LSR_FE) {
2117 flag = TTY_FRAME;
2118 port->icount.frame++;
2119 } else if (*status & UART_LSR_OE) {
2120 flag = TTY_OVERRUN;
2121 port->icount.overrun++;
2122 } else
2123 flag = TTY_BREAK;
2124 }
2125 tty_insert_flip_char(&port->port, ch, flag);
2126 cnt++;
2127 if (cnt >= recv_room) {
2128 if (!port->ldisc_stop_rx)
2129 mxser_stoprx(tty);
2130 break;
2131 }
2132
2133 }
2134
2135 if (port->board->chip_flag)
2136 break;
2137
2138 *status = inb(port->ioaddr + UART_LSR);
2139 } while (*status & UART_LSR_DR);
2140
2141end_intr:
2142 mxvar_log.rxcnt[tty->index] += cnt;
2143 port->mon_data.rxcnt += cnt;
2144 port->mon_data.up_rxcnt += cnt;
2145
2146 /*
2147 * We are called from an interrupt context with &port->slock
2148 * being held. Drop it temporarily in order to prevent
2149 * recursive locking.
2150 */
2151 spin_unlock(&port->slock);
2152 tty_flip_buffer_push(&port->port);
2153 spin_lock(&port->slock);
2154}
2155
2156static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2157{
2158 int count, cnt;
2159
2160 if (port->x_char) {
2161 outb(port->x_char, port->ioaddr + UART_TX);
2162 port->x_char = 0;
2163 mxvar_log.txcnt[tty->index]++;
2164 port->mon_data.txcnt++;
2165 port->mon_data.up_txcnt++;
2166 port->icount.tx++;
2167 return;
2168 }
2169
2170 if (port->port.xmit_buf == NULL)
2171 return;
2172
2173 if (port->xmit_cnt <= 0 || tty->stopped ||
2174 (tty->hw_stopped &&
2175 (port->type != PORT_16550A) &&
2176 (!port->board->chip_flag))) {
2177 port->IER &= ~UART_IER_THRI;
2178 outb(port->IER, port->ioaddr + UART_IER);
2179 return;
2180 }
2181
2182 cnt = port->xmit_cnt;
2183 count = port->xmit_fifo_size;
2184 do {
2185 outb(port->port.xmit_buf[port->xmit_tail++],
2186 port->ioaddr + UART_TX);
2187 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2188 if (--port->xmit_cnt <= 0)
2189 break;
2190 } while (--count > 0);
2191 mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2192
2193 port->mon_data.txcnt += (cnt - port->xmit_cnt);
2194 port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2195 port->icount.tx += (cnt - port->xmit_cnt);
2196
2197 if (port->xmit_cnt < WAKEUP_CHARS)
2198 tty_wakeup(tty);
2199
2200 if (port->xmit_cnt <= 0) {
2201 port->IER &= ~UART_IER_THRI;
2202 outb(port->IER, port->ioaddr + UART_IER);
2203 }
2204}
2205
2206/*
2207 * This is the serial driver's generic interrupt routine
2208 */
2209static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2210{
2211 int status, iir, i;
2212 struct mxser_board *brd = NULL;
2213 struct mxser_port *port;
2214 int max, irqbits, bits, msr;
2215 unsigned int int_cnt, pass_counter = 0;
2216 int handled = IRQ_NONE;
2217 struct tty_struct *tty;
2218
2219 for (i = 0; i < MXSER_BOARDS; i++)
2220 if (dev_id == &mxser_boards[i]) {
2221 brd = dev_id;
2222 break;
2223 }
2224
2225 if (i == MXSER_BOARDS)
2226 goto irq_stop;
2227 if (brd == NULL)
2228 goto irq_stop;
2229 max = brd->info->nports;
2230 while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2231 irqbits = inb(brd->vector) & brd->vector_mask;
2232 if (irqbits == brd->vector_mask)
2233 break;
2234
2235 handled = IRQ_HANDLED;
2236 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2237 if (irqbits == brd->vector_mask)
2238 break;
2239 if (bits & irqbits)
2240 continue;
2241 port = &brd->ports[i];
2242
2243 int_cnt = 0;
2244 spin_lock(&port->slock);
2245 do {
2246 iir = inb(port->ioaddr + UART_IIR);
2247 if (iir & UART_IIR_NO_INT)
2248 break;
2249 iir &= MOXA_MUST_IIR_MASK;
2250 tty = tty_port_tty_get(&port->port);
2251 if (!tty || port->closing ||
2252 !tty_port_initialized(&port->port)) {
2253 status = inb(port->ioaddr + UART_LSR);
2254 outb(0x27, port->ioaddr + UART_FCR);
2255 inb(port->ioaddr + UART_MSR);
2256 tty_kref_put(tty);
2257 break;
2258 }
2259
2260 status = inb(port->ioaddr + UART_LSR);
2261
2262 if (status & UART_LSR_PE)
2263 port->err_shadow |= NPPI_NOTIFY_PARITY;
2264 if (status & UART_LSR_FE)
2265 port->err_shadow |= NPPI_NOTIFY_FRAMING;
2266 if (status & UART_LSR_OE)
2267 port->err_shadow |=
2268 NPPI_NOTIFY_HW_OVERRUN;
2269 if (status & UART_LSR_BI)
2270 port->err_shadow |= NPPI_NOTIFY_BREAK;
2271
2272 if (port->board->chip_flag) {
2273 if (iir == MOXA_MUST_IIR_GDA ||
2274 iir == MOXA_MUST_IIR_RDA ||
2275 iir == MOXA_MUST_IIR_RTO ||
2276 iir == MOXA_MUST_IIR_LSR)
2277 mxser_receive_chars(tty, port,
2278 &status);
2279
2280 } else {
2281 status &= port->read_status_mask;
2282 if (status & UART_LSR_DR)
2283 mxser_receive_chars(tty, port,
2284 &status);
2285 }
2286 msr = inb(port->ioaddr + UART_MSR);
2287 if (msr & UART_MSR_ANY_DELTA)
2288 mxser_check_modem_status(tty, port, msr);
2289
2290 if (port->board->chip_flag) {
2291 if (iir == 0x02 && (status &
2292 UART_LSR_THRE))
2293 mxser_transmit_chars(tty, port);
2294 } else {
2295 if (status & UART_LSR_THRE)
2296 mxser_transmit_chars(tty, port);
2297 }
2298 tty_kref_put(tty);
2299 } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2300 spin_unlock(&port->slock);
2301 }
2302 }
2303
2304irq_stop:
2305 return handled;
2306}
2307
2308static const struct tty_operations mxser_ops = {
2309 .open = mxser_open,
2310 .close = mxser_close,
2311 .write = mxser_write,
2312 .put_char = mxser_put_char,
2313 .flush_chars = mxser_flush_chars,
2314 .write_room = mxser_write_room,
2315 .chars_in_buffer = mxser_chars_in_buffer,
2316 .flush_buffer = mxser_flush_buffer,
2317 .ioctl = mxser_ioctl,
2318 .throttle = mxser_throttle,
2319 .unthrottle = mxser_unthrottle,
2320 .set_termios = mxser_set_termios,
2321 .stop = mxser_stop,
2322 .start = mxser_start,
2323 .hangup = mxser_hangup,
2324 .break_ctl = mxser_rs_break,
2325 .wait_until_sent = mxser_wait_until_sent,
2326 .tiocmget = mxser_tiocmget,
2327 .tiocmset = mxser_tiocmset,
2328 .set_serial = mxser_set_serial_info,
2329 .get_serial = mxser_get_serial_info,
2330 .get_icount = mxser_get_icount,
2331};
2332
2333static const struct tty_port_operations mxser_port_ops = {
2334 .carrier_raised = mxser_carrier_raised,
2335 .dtr_rts = mxser_dtr_rts,
2336 .activate = mxser_activate,
2337 .shutdown = mxser_shutdown_port,
2338};
2339
2340/*
2341 * The MOXA Smartio/Industio serial driver boot-time initialization code!
2342 */
2343
2344static bool allow_overlapping_vector;
2345module_param(allow_overlapping_vector, bool, S_IRUGO);
2346MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2347
2348static bool mxser_overlapping_vector(struct mxser_board *brd)
2349{
2350 return allow_overlapping_vector &&
2351 brd->vector >= brd->ports[0].ioaddr &&
2352 brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2353}
2354
2355static int mxser_request_vector(struct mxser_board *brd)
2356{
2357 if (mxser_overlapping_vector(brd))
2358 return 0;
2359 return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2360}
2361
2362static void mxser_release_vector(struct mxser_board *brd)
2363{
2364 if (mxser_overlapping_vector(brd))
2365 return;
2366 release_region(brd->vector, 1);
2367}
2368
2369static void mxser_release_ISA_res(struct mxser_board *brd)
2370{
2371 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2372 mxser_release_vector(brd);
2373}
2374
2375static int mxser_initbrd(struct mxser_board *brd)
2376{
2377 struct mxser_port *info;
2378 unsigned int i;
2379 int retval;
2380
2381 printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2382 brd->ports[0].max_baud);
2383
2384 for (i = 0; i < brd->info->nports; i++) {
2385 info = &brd->ports[i];
2386 tty_port_init(&info->port);
2387 info->port.ops = &mxser_port_ops;
2388 info->board = brd;
2389 info->stop_rx = 0;
2390 info->ldisc_stop_rx = 0;
2391
2392 /* Enhance mode enabled here */
2393 if (brd->chip_flag != MOXA_OTHER_UART)
2394 mxser_enable_must_enchance_mode(info->ioaddr);
2395
2396 info->type = brd->uart_type;
2397
2398 process_txrx_fifo(info);
2399
2400 info->custom_divisor = info->baud_base * 16;
2401 info->port.close_delay = 5 * HZ / 10;
2402 info->port.closing_wait = 30 * HZ;
2403 info->normal_termios = mxvar_sdriver->init_termios;
2404 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2405 info->err_shadow = 0;
2406 spin_lock_init(&info->slock);
2407
2408 /* before set INT ISR, disable all int */
2409 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2410 info->ioaddr + UART_IER);
2411 }
2412
2413 retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2414 brd);
2415 if (retval) {
2416 for (i = 0; i < brd->info->nports; i++)
2417 tty_port_destroy(&brd->ports[i].port);
2418 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2419 "conflict with another device.\n",
2420 brd->info->name, brd->irq);
2421 }
2422
2423 return retval;
2424}
2425
2426static void mxser_board_remove(struct mxser_board *brd)
2427{
2428 unsigned int i;
2429
2430 for (i = 0; i < brd->info->nports; i++) {
2431 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2432 tty_port_destroy(&brd->ports[i].port);
2433 }
2434 free_irq(brd->irq, brd);
2435}
2436
2437static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2438{
2439 int id, i, bits, ret;
2440 unsigned short regs[16], irq;
2441 unsigned char scratch, scratch2;
2442
2443 brd->chip_flag = MOXA_OTHER_UART;
2444
2445 id = mxser_read_register(cap, regs);
2446 switch (id) {
2447 case C168_ASIC_ID:
2448 brd->info = &mxser_cards[0];
2449 break;
2450 case C104_ASIC_ID:
2451 brd->info = &mxser_cards[1];
2452 break;
2453 case CI104J_ASIC_ID:
2454 brd->info = &mxser_cards[2];
2455 break;
2456 case C102_ASIC_ID:
2457 brd->info = &mxser_cards[5];
2458 break;
2459 case CI132_ASIC_ID:
2460 brd->info = &mxser_cards[6];
2461 break;
2462 case CI134_ASIC_ID:
2463 brd->info = &mxser_cards[7];
2464 break;
2465 default:
2466 return 0;
2467 }
2468
2469 irq = 0;
2470 /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2471 Flag-hack checks if configuration should be read as 2-port here. */
2472 if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2473 irq = regs[9] & 0xF000;
2474 irq = irq | (irq >> 4);
2475 if (irq != (regs[9] & 0xFF00))
2476 goto err_irqconflict;
2477 } else if (brd->info->nports == 4) {
2478 irq = regs[9] & 0xF000;
2479 irq = irq | (irq >> 4);
2480 irq = irq | (irq >> 8);
2481 if (irq != regs[9])
2482 goto err_irqconflict;
2483 } else if (brd->info->nports == 8) {
2484 irq = regs[9] & 0xF000;
2485 irq = irq | (irq >> 4);
2486 irq = irq | (irq >> 8);
2487 if ((irq != regs[9]) || (irq != regs[10]))
2488 goto err_irqconflict;
2489 }
2490
2491 if (!irq) {
2492 printk(KERN_ERR "mxser: interrupt number unset\n");
2493 return -EIO;
2494 }
2495 brd->irq = ((int)(irq & 0xF000) >> 12);
2496 for (i = 0; i < 8; i++)
2497 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2498 if ((regs[12] & 0x80) == 0) {
2499 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2500 return -EIO;
2501 }
2502 brd->vector = (int)regs[11]; /* interrupt vector */
2503 if (id == 1)
2504 brd->vector_mask = 0x00FF;
2505 else
2506 brd->vector_mask = 0x000F;
2507 for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2508 if (regs[12] & bits) {
2509 brd->ports[i].baud_base = 921600;
2510 brd->ports[i].max_baud = 921600;
2511 } else {
2512 brd->ports[i].baud_base = 115200;
2513 brd->ports[i].max_baud = 115200;
2514 }
2515 }
2516 scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2517 outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2518 outb(0, cap + UART_EFR); /* EFR is the same as FCR */
2519 outb(scratch2, cap + UART_LCR);
2520 outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2521 scratch = inb(cap + UART_IIR);
2522
2523 if (scratch & 0xC0)
2524 brd->uart_type = PORT_16550A;
2525 else
2526 brd->uart_type = PORT_16450;
2527 if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2528 "mxser(IO)")) {
2529 printk(KERN_ERR "mxser: can't request ports I/O region: "
2530 "0x%.8lx-0x%.8lx\n",
2531 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2532 8 * brd->info->nports - 1);
2533 return -EIO;
2534 }
2535
2536 ret = mxser_request_vector(brd);
2537 if (ret) {
2538 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2539 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2540 "0x%.8lx-0x%.8lx\n",
2541 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2542 8 * brd->info->nports - 1);
2543 return ret;
2544 }
2545 return brd->info->nports;
2546
2547err_irqconflict:
2548 printk(KERN_ERR "mxser: invalid interrupt number\n");
2549 return -EIO;
2550}
2551
2552static int mxser_probe(struct pci_dev *pdev,
2553 const struct pci_device_id *ent)
2554{
2555#ifdef CONFIG_PCI
2556 struct mxser_board *brd;
2557 unsigned int i, j;
2558 unsigned long ioaddress;
2559 struct device *tty_dev;
2560 int retval = -EINVAL;
2561
2562 for (i = 0; i < MXSER_BOARDS; i++)
2563 if (mxser_boards[i].info == NULL)
2564 break;
2565
2566 if (i >= MXSER_BOARDS) {
2567 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2568 "not configured\n", MXSER_BOARDS);
2569 goto err;
2570 }
2571
2572 brd = &mxser_boards[i];
2573 brd->idx = i * MXSER_PORTS_PER_BOARD;
2574 dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2575 mxser_cards[ent->driver_data].name,
2576 pdev->bus->number, PCI_SLOT(pdev->devfn));
2577
2578 retval = pci_enable_device(pdev);
2579 if (retval) {
2580 dev_err(&pdev->dev, "PCI enable failed\n");
2581 goto err;
2582 }
2583
2584 /* io address */
2585 ioaddress = pci_resource_start(pdev, 2);
2586 retval = pci_request_region(pdev, 2, "mxser(IO)");
2587 if (retval)
2588 goto err_dis;
2589
2590 brd->info = &mxser_cards[ent->driver_data];
2591 for (i = 0; i < brd->info->nports; i++)
2592 brd->ports[i].ioaddr = ioaddress + 8 * i;
2593
2594 /* vector */
2595 ioaddress = pci_resource_start(pdev, 3);
2596 retval = pci_request_region(pdev, 3, "mxser(vector)");
2597 if (retval)
2598 goto err_zero;
2599 brd->vector = ioaddress;
2600
2601 /* irq */
2602 brd->irq = pdev->irq;
2603
2604 brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2605 brd->uart_type = PORT_16550A;
2606 brd->vector_mask = 0;
2607
2608 for (i = 0; i < brd->info->nports; i++) {
2609 for (j = 0; j < UART_INFO_NUM; j++) {
2610 if (Gpci_uart_info[j].type == brd->chip_flag) {
2611 brd->ports[i].max_baud =
2612 Gpci_uart_info[j].max_baud;
2613
2614 /* exception....CP-102 */
2615 if (brd->info->flags & MXSER_HIGHBAUD)
2616 brd->ports[i].max_baud = 921600;
2617 break;
2618 }
2619 }
2620 }
2621
2622 if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2623 for (i = 0; i < brd->info->nports; i++) {
2624 if (i < 4)
2625 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2626 else
2627 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2628 }
2629 outb(0, ioaddress + 4); /* default set to RS232 mode */
2630 outb(0, ioaddress + 0x0c); /* default set to RS232 mode */
2631 }
2632
2633 for (i = 0; i < brd->info->nports; i++) {
2634 brd->vector_mask |= (1 << i);
2635 brd->ports[i].baud_base = 921600;
2636 }
2637
2638 /* mxser_initbrd will hook ISR. */
2639 retval = mxser_initbrd(brd);
2640 if (retval)
2641 goto err_rel3;
2642
2643 for (i = 0; i < brd->info->nports; i++) {
2644 tty_dev = tty_port_register_device(&brd->ports[i].port,
2645 mxvar_sdriver, brd->idx + i, &pdev->dev);
2646 if (IS_ERR(tty_dev)) {
2647 retval = PTR_ERR(tty_dev);
2648 for (; i > 0; i--)
2649 tty_unregister_device(mxvar_sdriver,
2650 brd->idx + i - 1);
2651 goto err_relbrd;
2652 }
2653 }
2654
2655 pci_set_drvdata(pdev, brd);
2656
2657 return 0;
2658err_relbrd:
2659 for (i = 0; i < brd->info->nports; i++)
2660 tty_port_destroy(&brd->ports[i].port);
2661 free_irq(brd->irq, brd);
2662err_rel3:
2663 pci_release_region(pdev, 3);
2664err_zero:
2665 brd->info = NULL;
2666 pci_release_region(pdev, 2);
2667err_dis:
2668 pci_disable_device(pdev);
2669err:
2670 return retval;
2671#else
2672 return -ENODEV;
2673#endif
2674}
2675
2676static void mxser_remove(struct pci_dev *pdev)
2677{
2678#ifdef CONFIG_PCI
2679 struct mxser_board *brd = pci_get_drvdata(pdev);
2680
2681 mxser_board_remove(brd);
2682
2683 pci_release_region(pdev, 2);
2684 pci_release_region(pdev, 3);
2685 pci_disable_device(pdev);
2686 brd->info = NULL;
2687#endif
2688}
2689
2690static struct pci_driver mxser_driver = {
2691 .name = "mxser",
2692 .id_table = mxser_pcibrds,
2693 .probe = mxser_probe,
2694 .remove = mxser_remove
2695};
2696
2697static int __init mxser_module_init(void)
2698{
2699 struct mxser_board *brd;
2700 struct device *tty_dev;
2701 unsigned int b, i, m;
2702 int retval;
2703
2704 mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2705 if (!mxvar_sdriver)
2706 return -ENOMEM;
2707
2708 printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2709 MXSER_VERSION);
2710
2711 /* Initialize the tty_driver structure */
2712 mxvar_sdriver->name = "ttyMI";
2713 mxvar_sdriver->major = ttymajor;
2714 mxvar_sdriver->minor_start = 0;
2715 mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2716 mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2717 mxvar_sdriver->init_termios = tty_std_termios;
2718 mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2719 mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2720 tty_set_operations(mxvar_sdriver, &mxser_ops);
2721
2722 retval = tty_register_driver(mxvar_sdriver);
2723 if (retval) {
2724 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2725 "tty driver !\n");
2726 goto err_put;
2727 }
2728
2729 /* Start finding ISA boards here */
2730 for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2731 if (!ioaddr[b])
2732 continue;
2733
2734 brd = &mxser_boards[m];
2735 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2736 if (retval <= 0) {
2737 brd->info = NULL;
2738 continue;
2739 }
2740
2741 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2742 brd->info->name, ioaddr[b]);
2743
2744 /* mxser_initbrd will hook ISR. */
2745 if (mxser_initbrd(brd) < 0) {
2746 mxser_release_ISA_res(brd);
2747 brd->info = NULL;
2748 continue;
2749 }
2750
2751 brd->idx = m * MXSER_PORTS_PER_BOARD;
2752 for (i = 0; i < brd->info->nports; i++) {
2753 tty_dev = tty_port_register_device(&brd->ports[i].port,
2754 mxvar_sdriver, brd->idx + i, NULL);
2755 if (IS_ERR(tty_dev)) {
2756 for (; i > 0; i--)
2757 tty_unregister_device(mxvar_sdriver,
2758 brd->idx + i - 1);
2759 for (i = 0; i < brd->info->nports; i++)
2760 tty_port_destroy(&brd->ports[i].port);
2761 free_irq(brd->irq, brd);
2762 mxser_release_ISA_res(brd);
2763 brd->info = NULL;
2764 break;
2765 }
2766 }
2767 if (brd->info == NULL)
2768 continue;
2769
2770 m++;
2771 }
2772
2773 retval = pci_register_driver(&mxser_driver);
2774 if (retval) {
2775 printk(KERN_ERR "mxser: can't register pci driver\n");
2776 if (!m) {
2777 retval = -ENODEV;
2778 goto err_unr;
2779 } /* else: we have some ISA cards under control */
2780 }
2781
2782 return 0;
2783err_unr:
2784 tty_unregister_driver(mxvar_sdriver);
2785err_put:
2786 put_tty_driver(mxvar_sdriver);
2787 return retval;
2788}
2789
2790static void __exit mxser_module_exit(void)
2791{
2792 unsigned int i;
2793
2794 pci_unregister_driver(&mxser_driver);
2795
2796 for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2797 if (mxser_boards[i].info != NULL)
2798 mxser_board_remove(&mxser_boards[i]);
2799 tty_unregister_driver(mxvar_sdriver);
2800 put_tty_driver(mxvar_sdriver);
2801
2802 for (i = 0; i < MXSER_BOARDS; i++)
2803 if (mxser_boards[i].info != NULL)
2804 mxser_release_ISA_res(&mxser_boards[i]);
2805}
2806
2807module_init(mxser_module_init);
2808module_exit(mxser_module_exit);
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * mxser.c -- MOXA Smartio/Industio family multiport serial driver.
4 *
5 * Copyright (C) 1999-2006 Moxa Technologies (support@moxa.com).
6 * Copyright (C) 2006-2008 Jiri Slaby <jirislaby@gmail.com>
7 *
8 * This code is loosely based on the 1.8 moxa driver which is based on
9 * Linux serial driver, written by Linus Torvalds, Theodore T'so and
10 * others.
11 *
12 * Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
13 * <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
14 * www.moxa.com.
15 * - Fixed x86_64 cleanness
16 */
17
18#include <linux/module.h>
19#include <linux/errno.h>
20#include <linux/signal.h>
21#include <linux/sched.h>
22#include <linux/timer.h>
23#include <linux/interrupt.h>
24#include <linux/tty.h>
25#include <linux/tty_flip.h>
26#include <linux/serial.h>
27#include <linux/serial_reg.h>
28#include <linux/major.h>
29#include <linux/string.h>
30#include <linux/fcntl.h>
31#include <linux/ptrace.h>
32#include <linux/ioport.h>
33#include <linux/mm.h>
34#include <linux/delay.h>
35#include <linux/pci.h>
36#include <linux/bitops.h>
37#include <linux/slab.h>
38#include <linux/ratelimit.h>
39
40#include <asm/io.h>
41#include <asm/irq.h>
42#include <linux/uaccess.h>
43
44/*
45 * Semi-public control interfaces
46 */
47
48/*
49 * MOXA ioctls
50 */
51
52#define MOXA 0x400
53#define MOXA_SET_OP_MODE (MOXA + 66)
54#define MOXA_GET_OP_MODE (MOXA + 67)
55
56#define RS232_MODE 0
57#define RS485_2WIRE_MODE 1
58#define RS422_MODE 2
59#define RS485_4WIRE_MODE 3
60#define OP_MODE_MASK 3
61
62/* --------------------------------------------------- */
63
64/*
65 * Follow just what Moxa Must chip defines.
66 *
67 * When LCR register (offset 0x03) is written the following value, the Must chip
68 * will enter enhanced mode. And a write to EFR (offset 0x02) bit 6,7 will
69 * change bank.
70 */
71#define MOXA_MUST_ENTER_ENHANCED 0xBF
72
73/* when enhanced mode is enabled, access to general bank register */
74#define MOXA_MUST_GDL_REGISTER 0x07
75#define MOXA_MUST_GDL_MASK 0x7F
76#define MOXA_MUST_GDL_HAS_BAD_DATA 0x80
77
78#define MOXA_MUST_LSR_RERR 0x80 /* error in receive FIFO */
79/* enhanced register bank select and enhanced mode setting register */
80/* This works only when LCR register equals to 0xBF */
81#define MOXA_MUST_EFR_REGISTER 0x02
82#define MOXA_MUST_EFR_EFRB_ENABLE 0x10 /* enhanced mode enable */
83/* enhanced register bank set 0, 1, 2 */
84#define MOXA_MUST_EFR_BANK0 0x00
85#define MOXA_MUST_EFR_BANK1 0x40
86#define MOXA_MUST_EFR_BANK2 0x80
87#define MOXA_MUST_EFR_BANK3 0xC0
88#define MOXA_MUST_EFR_BANK_MASK 0xC0
89
90/* set XON1 value register, when LCR=0xBF and change to bank0 */
91#define MOXA_MUST_XON1_REGISTER 0x04
92
93/* set XON2 value register, when LCR=0xBF and change to bank0 */
94#define MOXA_MUST_XON2_REGISTER 0x05
95
96/* set XOFF1 value register, when LCR=0xBF and change to bank0 */
97#define MOXA_MUST_XOFF1_REGISTER 0x06
98
99/* set XOFF2 value register, when LCR=0xBF and change to bank0 */
100#define MOXA_MUST_XOFF2_REGISTER 0x07
101
102#define MOXA_MUST_RBRTL_REGISTER 0x04
103#define MOXA_MUST_RBRTH_REGISTER 0x05
104#define MOXA_MUST_RBRTI_REGISTER 0x06
105#define MOXA_MUST_THRTL_REGISTER 0x07
106#define MOXA_MUST_ENUM_REGISTER 0x04
107#define MOXA_MUST_HWID_REGISTER 0x05
108#define MOXA_MUST_ECR_REGISTER 0x06
109#define MOXA_MUST_CSR_REGISTER 0x07
110
111#define MOXA_MUST_FCR_GDA_MODE_ENABLE 0x20 /* good data mode enable */
112#define MOXA_MUST_FCR_GDA_ONLY_ENABLE 0x10 /* only good data put into RxFIFO */
113
114#define MOXA_MUST_IER_ECTSI 0x80 /* enable CTS interrupt */
115#define MOXA_MUST_IER_ERTSI 0x40 /* enable RTS interrupt */
116#define MOXA_MUST_IER_XINT 0x20 /* enable Xon/Xoff interrupt */
117#define MOXA_MUST_IER_EGDAI 0x10 /* enable GDA interrupt */
118
119#define MOXA_MUST_RECV_ISR (UART_IER_RDI | MOXA_MUST_IER_EGDAI)
120
121/* GDA interrupt pending */
122#define MOXA_MUST_IIR_GDA 0x1C
123#define MOXA_MUST_IIR_RDA 0x04
124#define MOXA_MUST_IIR_RTO 0x0C
125#define MOXA_MUST_IIR_LSR 0x06
126
127/* received Xon/Xoff or specical interrupt pending */
128#define MOXA_MUST_IIR_XSC 0x10
129
130/* RTS/CTS change state interrupt pending */
131#define MOXA_MUST_IIR_RTSCTS 0x20
132#define MOXA_MUST_IIR_MASK 0x3E
133
134#define MOXA_MUST_MCR_XON_FLAG 0x40
135#define MOXA_MUST_MCR_XON_ANY 0x80
136#define MOXA_MUST_MCR_TX_XON 0x08
137
138#define MOXA_MUST_EFR_SF_MASK 0x0F /* software flow control on chip mask value */
139#define MOXA_MUST_EFR_SF_TX1 0x08 /* send Xon1/Xoff1 */
140#define MOXA_MUST_EFR_SF_TX2 0x04 /* send Xon2/Xoff2 */
141#define MOXA_MUST_EFR_SF_TX12 0x0C /* send Xon1,Xon2/Xoff1,Xoff2 */
142#define MOXA_MUST_EFR_SF_TX_NO 0x00 /* don't send Xon/Xoff */
143#define MOXA_MUST_EFR_SF_TX_MASK 0x0C /* Tx software flow control mask */
144#define MOXA_MUST_EFR_SF_RX_NO 0x00 /* don't receive Xon/Xoff */
145#define MOXA_MUST_EFR_SF_RX1 0x02 /* receive Xon1/Xoff1 */
146#define MOXA_MUST_EFR_SF_RX2 0x01 /* receive Xon2/Xoff2 */
147#define MOXA_MUST_EFR_SF_RX12 0x03 /* receive Xon1,Xon2/Xoff1,Xoff2 */
148#define MOXA_MUST_EFR_SF_RX_MASK 0x03 /* Rx software flow control mask */
149
150#define MXSERMAJOR 174
151
152#define MXSER_BOARDS 4 /* Max. boards */
153#define MXSER_PORTS_PER_BOARD 8 /* Max. ports per board */
154#define MXSER_PORTS (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
155#define MXSER_ISR_PASS_LIMIT 100
156
157#define WAKEUP_CHARS 256
158
159#define MXSER_BAUD_BASE 921600
160#define MXSER_CUSTOM_DIVISOR (MXSER_BAUD_BASE * 16)
161
162#define PCI_DEVICE_ID_POS104UL 0x1044
163#define PCI_DEVICE_ID_CB108 0x1080
164#define PCI_DEVICE_ID_CP102UF 0x1023
165#define PCI_DEVICE_ID_CP112UL 0x1120
166#define PCI_DEVICE_ID_CB114 0x1142
167#define PCI_DEVICE_ID_CP114UL 0x1143
168#define PCI_DEVICE_ID_CB134I 0x1341
169#define PCI_DEVICE_ID_CP138U 0x1380
170
171#define MXSER_NPORTS(ddata) ((ddata) & 0xffU)
172#define MXSER_HIGHBAUD 0x0100
173
174enum mxser_must_hwid {
175 MOXA_OTHER_UART = 0x00,
176 MOXA_MUST_MU150_HWID = 0x01,
177 MOXA_MUST_MU860_HWID = 0x02,
178};
179
180static const struct {
181 u8 type;
182 u8 fifo_size;
183 u8 rx_high_water;
184 u8 rx_low_water;
185 speed_t max_baud;
186} Gpci_uart_info[] = {
187 { MOXA_OTHER_UART, 16, 14, 1, 921600 },
188 { MOXA_MUST_MU150_HWID, 64, 48, 16, 230400 },
189 { MOXA_MUST_MU860_HWID, 128, 96, 32, 921600 }
190};
191#define UART_INFO_NUM ARRAY_SIZE(Gpci_uart_info)
192
193
194/* driver_data correspond to the lines in the structure above
195 see also ISA probe function before you change something */
196static const struct pci_device_id mxser_pcibrds[] = {
197 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168), .driver_data = 8 },
198 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104), .driver_data = 4 },
199 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132), .driver_data = 2 },
200 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114), .driver_data = 4 },
201 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114), .driver_data = 4 },
202 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102), .driver_data = 2 | MXSER_HIGHBAUD },
203 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 4 },
204 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 8 },
205 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 2 },
206 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 4 },
207 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 4 },
208 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 8 }, /* RC7000 */
209 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 8 },
210 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 2 },
211 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 2 },
212 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 8 },
213 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 8 },
214 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 4 },
215 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108), .driver_data = 8 },
216 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114), .driver_data = 4 },
217 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I), .driver_data = 4 },
218 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U), .driver_data = 8 },
219 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL), .driver_data = 4 },
220 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL), .driver_data = 4 },
221 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF), .driver_data = 2 },
222 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL), .driver_data = 2 },
223 { }
224};
225MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
226
227static int ttymajor = MXSERMAJOR;
228
229/* Variables for insmod */
230
231MODULE_AUTHOR("Casper Yang");
232MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
233module_param(ttymajor, int, 0);
234MODULE_LICENSE("GPL");
235
236struct mxser_board;
237
238struct mxser_port {
239 struct tty_port port;
240 struct mxser_board *board;
241
242 unsigned long ioaddr;
243 unsigned long opmode_ioaddr;
244
245 u8 rx_high_water;
246 u8 rx_low_water;
247 int type; /* UART type */
248
249 unsigned char x_char; /* xon/xoff character */
250 u8 IER; /* Interrupt Enable Register */
251 u8 MCR; /* Modem control register */
252
253 unsigned char ldisc_stop_rx;
254
255 struct async_icount icount; /* kernel counters for 4 input interrupts */
256 unsigned int timeout;
257
258 u8 read_status_mask;
259 u8 ignore_status_mask;
260 u8 xmit_fifo_size;
261 unsigned int xmit_head;
262 unsigned int xmit_tail;
263 unsigned int xmit_cnt;
264 int closing;
265
266 spinlock_t slock;
267};
268
269struct mxser_board {
270 unsigned int idx;
271 unsigned short nports;
272 int irq;
273 unsigned long vector;
274
275 enum mxser_must_hwid must_hwid;
276 speed_t max_baud;
277
278 struct mxser_port ports[];
279};
280
281static DECLARE_BITMAP(mxser_boards, MXSER_BOARDS);
282static struct tty_driver *mxvar_sdriver;
283
284static u8 __mxser_must_set_EFR(unsigned long baseio, u8 clear, u8 set,
285 bool restore_LCR)
286{
287 u8 oldlcr, efr;
288
289 oldlcr = inb(baseio + UART_LCR);
290 outb(MOXA_MUST_ENTER_ENHANCED, baseio + UART_LCR);
291
292 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
293 efr &= ~clear;
294 efr |= set;
295
296 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
297
298 if (restore_LCR)
299 outb(oldlcr, baseio + UART_LCR);
300
301 return oldlcr;
302}
303
304static u8 mxser_must_select_bank(unsigned long baseio, u8 bank)
305{
306 return __mxser_must_set_EFR(baseio, MOXA_MUST_EFR_BANK_MASK, bank,
307 false);
308}
309
310static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
311{
312 u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK0);
313 outb(value, baseio + MOXA_MUST_XON1_REGISTER);
314 outb(oldlcr, baseio + UART_LCR);
315}
316
317static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
318{
319 u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK0);
320 outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
321 outb(oldlcr, baseio + UART_LCR);
322}
323
324static void mxser_set_must_fifo_value(struct mxser_port *info)
325{
326 u8 oldlcr = mxser_must_select_bank(info->ioaddr, MOXA_MUST_EFR_BANK1);
327 outb(info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
328 outb(info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
329 outb(info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
330 outb(oldlcr, info->ioaddr + UART_LCR);
331}
332
333static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
334{
335 u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK2);
336 outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
337 outb(oldlcr, baseio + UART_LCR);
338}
339
340static u8 mxser_get_must_hardware_id(unsigned long baseio)
341{
342 u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK2);
343 u8 id = inb(baseio + MOXA_MUST_HWID_REGISTER);
344 outb(oldlcr, baseio + UART_LCR);
345
346 return id;
347}
348
349static void mxser_must_set_EFR(unsigned long baseio, u8 clear, u8 set)
350{
351 __mxser_must_set_EFR(baseio, clear, set, true);
352}
353
354static void mxser_must_set_enhance_mode(unsigned long baseio, bool enable)
355{
356 mxser_must_set_EFR(baseio,
357 enable ? 0 : MOXA_MUST_EFR_EFRB_ENABLE,
358 enable ? MOXA_MUST_EFR_EFRB_ENABLE : 0);
359}
360
361static void mxser_must_no_sw_flow_control(unsigned long baseio)
362{
363 mxser_must_set_EFR(baseio, MOXA_MUST_EFR_SF_MASK, 0);
364}
365
366static void mxser_must_set_tx_sw_flow_control(unsigned long baseio, bool enable)
367{
368 mxser_must_set_EFR(baseio, MOXA_MUST_EFR_SF_TX_MASK,
369 enable ? MOXA_MUST_EFR_SF_TX1 : 0);
370}
371
372static void mxser_must_set_rx_sw_flow_control(unsigned long baseio, bool enable)
373{
374 mxser_must_set_EFR(baseio, MOXA_MUST_EFR_SF_RX_MASK,
375 enable ? MOXA_MUST_EFR_SF_RX1 : 0);
376}
377
378static enum mxser_must_hwid mxser_must_get_hwid(unsigned long io)
379{
380 u8 oldmcr, hwid;
381 int i;
382
383 outb(0, io + UART_LCR);
384 mxser_must_set_enhance_mode(io, false);
385 oldmcr = inb(io + UART_MCR);
386 outb(0, io + UART_MCR);
387 mxser_set_must_xon1_value(io, 0x11);
388 if ((hwid = inb(io + UART_MCR)) != 0) {
389 outb(oldmcr, io + UART_MCR);
390 return MOXA_OTHER_UART;
391 }
392
393 hwid = mxser_get_must_hardware_id(io);
394 for (i = 1; i < UART_INFO_NUM; i++) /* 0 = OTHER_UART */
395 if (hwid == Gpci_uart_info[i].type)
396 return hwid;
397
398 return MOXA_OTHER_UART;
399}
400
401static bool mxser_16550A_or_MUST(struct mxser_port *info)
402{
403 return info->type == PORT_16550A || info->board->must_hwid;
404}
405
406static void mxser_process_txrx_fifo(struct mxser_port *info)
407{
408 unsigned int i;
409
410 if (info->type == PORT_16450 || info->type == PORT_8250) {
411 info->rx_high_water = 1;
412 info->rx_low_water = 1;
413 info->xmit_fifo_size = 1;
414 return;
415 }
416
417 for (i = 0; i < UART_INFO_NUM; i++)
418 if (info->board->must_hwid == Gpci_uart_info[i].type) {
419 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
420 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
421 info->xmit_fifo_size = Gpci_uart_info[i].fifo_size;
422 break;
423 }
424}
425
426static void __mxser_start_tx(struct mxser_port *info)
427{
428 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
429 info->IER |= UART_IER_THRI;
430 outb(info->IER, info->ioaddr + UART_IER);
431}
432
433static void mxser_start_tx(struct mxser_port *info)
434{
435 unsigned long flags;
436
437 spin_lock_irqsave(&info->slock, flags);
438 __mxser_start_tx(info);
439 spin_unlock_irqrestore(&info->slock, flags);
440}
441
442static void __mxser_stop_tx(struct mxser_port *info)
443{
444 info->IER &= ~UART_IER_THRI;
445 outb(info->IER, info->ioaddr + UART_IER);
446}
447
448static int mxser_carrier_raised(struct tty_port *port)
449{
450 struct mxser_port *mp = container_of(port, struct mxser_port, port);
451 return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
452}
453
454static void mxser_dtr_rts(struct tty_port *port, int on)
455{
456 struct mxser_port *mp = container_of(port, struct mxser_port, port);
457 unsigned long flags;
458 u8 mcr;
459
460 spin_lock_irqsave(&mp->slock, flags);
461 mcr = inb(mp->ioaddr + UART_MCR);
462 if (on)
463 mcr |= UART_MCR_DTR | UART_MCR_RTS;
464 else
465 mcr &= ~(UART_MCR_DTR | UART_MCR_RTS);
466 outb(mcr, mp->ioaddr + UART_MCR);
467 spin_unlock_irqrestore(&mp->slock, flags);
468}
469
470static int mxser_set_baud(struct tty_struct *tty, speed_t newspd)
471{
472 struct mxser_port *info = tty->driver_data;
473 unsigned int quot = 0, baud;
474 unsigned char cval;
475 u64 timeout;
476
477 if (newspd > info->board->max_baud)
478 return -1;
479
480 if (newspd == 134) {
481 quot = 2 * MXSER_BAUD_BASE / 269;
482 tty_encode_baud_rate(tty, 134, 134);
483 } else if (newspd) {
484 quot = MXSER_BAUD_BASE / newspd;
485 if (quot == 0)
486 quot = 1;
487 baud = MXSER_BAUD_BASE / quot;
488 tty_encode_baud_rate(tty, baud, baud);
489 } else {
490 quot = 0;
491 }
492
493 /*
494 * worst case (128 * 1000 * 10 * 18432) needs 35 bits, so divide in the
495 * u64 domain
496 */
497 timeout = (u64)info->xmit_fifo_size * HZ * 10 * quot;
498 do_div(timeout, MXSER_BAUD_BASE);
499 info->timeout = timeout + HZ / 50; /* Add .02 seconds of slop */
500
501 if (quot) {
502 info->MCR |= UART_MCR_DTR;
503 outb(info->MCR, info->ioaddr + UART_MCR);
504 } else {
505 info->MCR &= ~UART_MCR_DTR;
506 outb(info->MCR, info->ioaddr + UART_MCR);
507 return 0;
508 }
509
510 cval = inb(info->ioaddr + UART_LCR);
511
512 outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR); /* set DLAB */
513
514 outb(quot & 0xff, info->ioaddr + UART_DLL); /* LS of divisor */
515 outb(quot >> 8, info->ioaddr + UART_DLM); /* MS of divisor */
516 outb(cval, info->ioaddr + UART_LCR); /* reset DLAB */
517
518#ifdef BOTHER
519 if (C_BAUD(tty) == BOTHER) {
520 quot = MXSER_BAUD_BASE % newspd;
521 quot *= 8;
522 if (quot % newspd > newspd / 2) {
523 quot /= newspd;
524 quot++;
525 } else
526 quot /= newspd;
527
528 mxser_set_must_enum_value(info->ioaddr, quot);
529 } else
530#endif
531 mxser_set_must_enum_value(info->ioaddr, 0);
532
533 return 0;
534}
535
536static void mxser_handle_cts(struct tty_struct *tty, struct mxser_port *info,
537 u8 msr)
538{
539 bool cts = msr & UART_MSR_CTS;
540
541 if (tty->hw_stopped) {
542 if (cts) {
543 tty->hw_stopped = 0;
544
545 if (!mxser_16550A_or_MUST(info))
546 __mxser_start_tx(info);
547 tty_wakeup(tty);
548 }
549 return;
550 } else if (cts)
551 return;
552
553 tty->hw_stopped = 1;
554 if (!mxser_16550A_or_MUST(info))
555 __mxser_stop_tx(info);
556}
557
558/*
559 * This routine is called to set the UART divisor registers to match
560 * the specified baud rate for a serial port.
561 */
562static void mxser_change_speed(struct tty_struct *tty)
563{
564 struct mxser_port *info = tty->driver_data;
565 unsigned cflag, cval, fcr;
566
567 cflag = tty->termios.c_cflag;
568
569 mxser_set_baud(tty, tty_get_baud_rate(tty));
570
571 /* byte size and parity */
572 switch (cflag & CSIZE) {
573 default:
574 case CS5:
575 cval = UART_LCR_WLEN5;
576 break;
577 case CS6:
578 cval = UART_LCR_WLEN6;
579 break;
580 case CS7:
581 cval = UART_LCR_WLEN7;
582 break;
583 case CS8:
584 cval = UART_LCR_WLEN8;
585 break;
586 }
587
588 if (cflag & CSTOPB)
589 cval |= UART_LCR_STOP;
590 if (cflag & PARENB)
591 cval |= UART_LCR_PARITY;
592 if (!(cflag & PARODD))
593 cval |= UART_LCR_EPAR;
594 if (cflag & CMSPAR)
595 cval |= UART_LCR_SPAR;
596
597 if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
598 if (info->board->must_hwid) {
599 fcr = UART_FCR_ENABLE_FIFO;
600 fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
601 mxser_set_must_fifo_value(info);
602 } else
603 fcr = 0;
604 } else {
605 fcr = UART_FCR_ENABLE_FIFO;
606 if (info->board->must_hwid) {
607 fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
608 mxser_set_must_fifo_value(info);
609 } else {
610 switch (info->rx_high_water) {
611 case 1:
612 fcr |= UART_FCR_TRIGGER_1;
613 break;
614 case 4:
615 fcr |= UART_FCR_TRIGGER_4;
616 break;
617 case 8:
618 fcr |= UART_FCR_TRIGGER_8;
619 break;
620 default:
621 fcr |= UART_FCR_TRIGGER_14;
622 break;
623 }
624 }
625 }
626
627 /* CTS flow control flag and modem status interrupts */
628 info->IER &= ~UART_IER_MSI;
629 info->MCR &= ~UART_MCR_AFE;
630 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
631 if (cflag & CRTSCTS) {
632 info->IER |= UART_IER_MSI;
633 if (mxser_16550A_or_MUST(info)) {
634 info->MCR |= UART_MCR_AFE;
635 } else {
636 mxser_handle_cts(tty, info,
637 inb(info->ioaddr + UART_MSR));
638 }
639 }
640 outb(info->MCR, info->ioaddr + UART_MCR);
641 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
642 if (~cflag & CLOCAL)
643 info->IER |= UART_IER_MSI;
644 outb(info->IER, info->ioaddr + UART_IER);
645
646 /*
647 * Set up parity check flag
648 */
649 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
650 if (I_INPCK(tty))
651 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
652 if (I_BRKINT(tty) || I_PARMRK(tty))
653 info->read_status_mask |= UART_LSR_BI;
654
655 info->ignore_status_mask = 0;
656
657 if (I_IGNBRK(tty)) {
658 info->ignore_status_mask |= UART_LSR_BI;
659 info->read_status_mask |= UART_LSR_BI;
660 /*
661 * If we're ignore parity and break indicators, ignore
662 * overruns too. (For real raw support).
663 */
664 if (I_IGNPAR(tty)) {
665 info->ignore_status_mask |=
666 UART_LSR_OE |
667 UART_LSR_PE |
668 UART_LSR_FE;
669 info->read_status_mask |=
670 UART_LSR_OE |
671 UART_LSR_PE |
672 UART_LSR_FE;
673 }
674 }
675 if (info->board->must_hwid) {
676 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
677 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
678 mxser_must_set_rx_sw_flow_control(info->ioaddr, I_IXON(tty));
679 mxser_must_set_tx_sw_flow_control(info->ioaddr, I_IXOFF(tty));
680 }
681
682
683 outb(fcr, info->ioaddr + UART_FCR); /* set fcr */
684 outb(cval, info->ioaddr + UART_LCR);
685}
686
687static void mxser_check_modem_status(struct tty_struct *tty,
688 struct mxser_port *port, int status)
689{
690 /* update input line counters */
691 if (status & UART_MSR_TERI)
692 port->icount.rng++;
693 if (status & UART_MSR_DDSR)
694 port->icount.dsr++;
695 if (status & UART_MSR_DDCD)
696 port->icount.dcd++;
697 if (status & UART_MSR_DCTS)
698 port->icount.cts++;
699 wake_up_interruptible(&port->port.delta_msr_wait);
700
701 if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
702 if (status & UART_MSR_DCD)
703 wake_up_interruptible(&port->port.open_wait);
704 }
705
706 if (tty_port_cts_enabled(&port->port))
707 mxser_handle_cts(tty, port, status);
708}
709
710static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
711{
712 struct mxser_port *info = container_of(port, struct mxser_port, port);
713 unsigned long page;
714 unsigned long flags;
715
716 page = __get_free_page(GFP_KERNEL);
717 if (!page)
718 return -ENOMEM;
719
720 spin_lock_irqsave(&info->slock, flags);
721
722 if (!info->type) {
723 set_bit(TTY_IO_ERROR, &tty->flags);
724 free_page(page);
725 spin_unlock_irqrestore(&info->slock, flags);
726 return 0;
727 }
728 info->port.xmit_buf = (unsigned char *) page;
729
730 /*
731 * Clear the FIFO buffers and disable them
732 * (they will be reenabled in mxser_change_speed())
733 */
734 if (info->board->must_hwid)
735 outb((UART_FCR_CLEAR_RCVR |
736 UART_FCR_CLEAR_XMIT |
737 MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
738 else
739 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
740 info->ioaddr + UART_FCR);
741
742 /*
743 * At this point there's no way the LSR could still be 0xFF;
744 * if it is, then bail out, because there's likely no UART
745 * here.
746 */
747 if (inb(info->ioaddr + UART_LSR) == 0xff) {
748 spin_unlock_irqrestore(&info->slock, flags);
749 if (capable(CAP_SYS_ADMIN)) {
750 set_bit(TTY_IO_ERROR, &tty->flags);
751 return 0;
752 } else
753 return -ENODEV;
754 }
755
756 /*
757 * Clear the interrupt registers.
758 */
759 (void) inb(info->ioaddr + UART_LSR);
760 (void) inb(info->ioaddr + UART_RX);
761 (void) inb(info->ioaddr + UART_IIR);
762 (void) inb(info->ioaddr + UART_MSR);
763
764 /*
765 * Now, initialize the UART
766 */
767 outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR); /* reset DLAB */
768 info->MCR = UART_MCR_DTR | UART_MCR_RTS;
769 outb(info->MCR, info->ioaddr + UART_MCR);
770
771 /*
772 * Finally, enable interrupts
773 */
774 info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
775
776 if (info->board->must_hwid)
777 info->IER |= MOXA_MUST_IER_EGDAI;
778 outb(info->IER, info->ioaddr + UART_IER); /* enable interrupts */
779
780 /*
781 * And clear the interrupt registers again for luck.
782 */
783 (void) inb(info->ioaddr + UART_LSR);
784 (void) inb(info->ioaddr + UART_RX);
785 (void) inb(info->ioaddr + UART_IIR);
786 (void) inb(info->ioaddr + UART_MSR);
787
788 clear_bit(TTY_IO_ERROR, &tty->flags);
789 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
790
791 /*
792 * and set the speed of the serial port
793 */
794 mxser_change_speed(tty);
795 spin_unlock_irqrestore(&info->slock, flags);
796
797 return 0;
798}
799
800/*
801 * This routine will shutdown a serial port
802 */
803static void mxser_shutdown_port(struct tty_port *port)
804{
805 struct mxser_port *info = container_of(port, struct mxser_port, port);
806 unsigned long flags;
807
808 spin_lock_irqsave(&info->slock, flags);
809
810 /*
811 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
812 * here so the queue might never be waken up
813 */
814 wake_up_interruptible(&info->port.delta_msr_wait);
815
816 /*
817 * Free the xmit buffer, if necessary
818 */
819 if (info->port.xmit_buf) {
820 free_page((unsigned long) info->port.xmit_buf);
821 info->port.xmit_buf = NULL;
822 }
823
824 info->IER = 0;
825 outb(0x00, info->ioaddr + UART_IER);
826
827 /* clear Rx/Tx FIFO's */
828 if (info->board->must_hwid)
829 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
830 MOXA_MUST_FCR_GDA_MODE_ENABLE,
831 info->ioaddr + UART_FCR);
832 else
833 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
834 info->ioaddr + UART_FCR);
835
836 /* read data port to reset things */
837 (void) inb(info->ioaddr + UART_RX);
838
839
840 if (info->board->must_hwid)
841 mxser_must_no_sw_flow_control(info->ioaddr);
842
843 spin_unlock_irqrestore(&info->slock, flags);
844}
845
846/*
847 * This routine is called whenever a serial port is opened. It
848 * enables interrupts for a serial port, linking in its async structure into
849 * the IRQ chain. It also performs the serial-specific
850 * initialization for the tty structure.
851 */
852static int mxser_open(struct tty_struct *tty, struct file *filp)
853{
854 struct tty_port *tport = tty->port;
855 struct mxser_port *port = container_of(tport, struct mxser_port, port);
856
857 tty->driver_data = port;
858
859 return tty_port_open(tport, tty, filp);
860}
861
862static void mxser_flush_buffer(struct tty_struct *tty)
863{
864 struct mxser_port *info = tty->driver_data;
865 char fcr;
866 unsigned long flags;
867
868
869 spin_lock_irqsave(&info->slock, flags);
870 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
871
872 fcr = inb(info->ioaddr + UART_FCR);
873 outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
874 info->ioaddr + UART_FCR);
875 outb(fcr, info->ioaddr + UART_FCR);
876
877 spin_unlock_irqrestore(&info->slock, flags);
878
879 tty_wakeup(tty);
880}
881
882
883static void mxser_close_port(struct tty_port *port)
884{
885 struct mxser_port *info = container_of(port, struct mxser_port, port);
886 unsigned long timeout;
887 /*
888 * At this point we stop accepting input. To do this, we
889 * disable the receive line status interrupts, and tell the
890 * interrupt driver to stop checking the data ready bit in the
891 * line status register.
892 */
893 info->IER &= ~UART_IER_RLSI;
894 if (info->board->must_hwid)
895 info->IER &= ~MOXA_MUST_RECV_ISR;
896
897 outb(info->IER, info->ioaddr + UART_IER);
898 /*
899 * Before we drop DTR, make sure the UART transmitter
900 * has completely drained; this is especially
901 * important if there is a transmit FIFO!
902 */
903 timeout = jiffies + HZ;
904 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
905 schedule_timeout_interruptible(5);
906 if (time_after(jiffies, timeout))
907 break;
908 }
909}
910
911/*
912 * This routine is called when the serial port gets closed. First, we
913 * wait for the last remaining data to be sent. Then, we unlink its
914 * async structure from the interrupt chain if necessary, and we free
915 * that IRQ if nothing is left in the chain.
916 */
917static void mxser_close(struct tty_struct *tty, struct file *filp)
918{
919 struct mxser_port *info = tty->driver_data;
920 struct tty_port *port = &info->port;
921
922 if (info == NULL)
923 return;
924 if (tty_port_close_start(port, tty, filp) == 0)
925 return;
926 info->closing = 1;
927 mutex_lock(&port->mutex);
928 mxser_close_port(port);
929 mxser_flush_buffer(tty);
930 if (tty_port_initialized(port) && C_HUPCL(tty))
931 tty_port_lower_dtr_rts(port);
932 mxser_shutdown_port(port);
933 tty_port_set_initialized(port, 0);
934 mutex_unlock(&port->mutex);
935 info->closing = 0;
936 /* Right now the tty_port set is done outside of the close_end helper
937 as we don't yet have everyone using refcounts */
938 tty_port_close_end(port, tty);
939 tty_port_tty_set(port, NULL);
940}
941
942static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
943{
944 int c, total = 0;
945 struct mxser_port *info = tty->driver_data;
946 unsigned long flags;
947
948 if (!info->port.xmit_buf)
949 return 0;
950
951 while (1) {
952 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
953 SERIAL_XMIT_SIZE - info->xmit_head));
954 if (c <= 0)
955 break;
956
957 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
958 spin_lock_irqsave(&info->slock, flags);
959 info->xmit_head = (info->xmit_head + c) &
960 (SERIAL_XMIT_SIZE - 1);
961 info->xmit_cnt += c;
962 spin_unlock_irqrestore(&info->slock, flags);
963
964 buf += c;
965 count -= c;
966 total += c;
967 }
968
969 if (info->xmit_cnt && !tty->flow.stopped)
970 if (!tty->hw_stopped || mxser_16550A_or_MUST(info))
971 mxser_start_tx(info);
972
973 return total;
974}
975
976static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
977{
978 struct mxser_port *info = tty->driver_data;
979 unsigned long flags;
980
981 if (!info->port.xmit_buf)
982 return 0;
983
984 if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
985 return 0;
986
987 spin_lock_irqsave(&info->slock, flags);
988 info->port.xmit_buf[info->xmit_head++] = ch;
989 info->xmit_head &= SERIAL_XMIT_SIZE - 1;
990 info->xmit_cnt++;
991 spin_unlock_irqrestore(&info->slock, flags);
992
993 return 1;
994}
995
996
997static void mxser_flush_chars(struct tty_struct *tty)
998{
999 struct mxser_port *info = tty->driver_data;
1000
1001 if (!info->xmit_cnt || tty->flow.stopped || !info->port.xmit_buf ||
1002 (tty->hw_stopped && !mxser_16550A_or_MUST(info)))
1003 return;
1004
1005 mxser_start_tx(info);
1006}
1007
1008static unsigned int mxser_write_room(struct tty_struct *tty)
1009{
1010 struct mxser_port *info = tty->driver_data;
1011 int ret;
1012
1013 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1014 return ret < 0 ? 0 : ret;
1015}
1016
1017static unsigned int mxser_chars_in_buffer(struct tty_struct *tty)
1018{
1019 struct mxser_port *info = tty->driver_data;
1020 return info->xmit_cnt;
1021}
1022
1023/*
1024 * ------------------------------------------------------------
1025 * friends of mxser_ioctl()
1026 * ------------------------------------------------------------
1027 */
1028static int mxser_get_serial_info(struct tty_struct *tty,
1029 struct serial_struct *ss)
1030{
1031 struct mxser_port *info = tty->driver_data;
1032 struct tty_port *port = &info->port;
1033 unsigned int closing_wait, close_delay;
1034
1035 mutex_lock(&port->mutex);
1036
1037 close_delay = jiffies_to_msecs(info->port.close_delay) / 10;
1038 closing_wait = info->port.closing_wait;
1039 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
1040 closing_wait = jiffies_to_msecs(closing_wait) / 10;
1041
1042 ss->type = info->type,
1043 ss->line = tty->index,
1044 ss->port = info->ioaddr,
1045 ss->irq = info->board->irq,
1046 ss->flags = info->port.flags,
1047 ss->baud_base = MXSER_BAUD_BASE,
1048 ss->close_delay = close_delay;
1049 ss->closing_wait = closing_wait;
1050 ss->custom_divisor = MXSER_CUSTOM_DIVISOR,
1051 mutex_unlock(&port->mutex);
1052 return 0;
1053}
1054
1055static int mxser_set_serial_info(struct tty_struct *tty,
1056 struct serial_struct *ss)
1057{
1058 struct mxser_port *info = tty->driver_data;
1059 struct tty_port *port = &info->port;
1060 speed_t baud;
1061 unsigned long sl_flags;
1062 unsigned int old_speed, close_delay, closing_wait;
1063 int retval = 0;
1064
1065 if (tty_io_error(tty))
1066 return -EIO;
1067
1068 mutex_lock(&port->mutex);
1069
1070 if (ss->irq != info->board->irq ||
1071 ss->port != info->ioaddr) {
1072 mutex_unlock(&port->mutex);
1073 return -EINVAL;
1074 }
1075
1076 old_speed = port->flags & ASYNC_SPD_MASK;
1077
1078 close_delay = msecs_to_jiffies(ss->close_delay * 10);
1079 closing_wait = ss->closing_wait;
1080 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
1081 closing_wait = msecs_to_jiffies(closing_wait * 10);
1082
1083 if (!capable(CAP_SYS_ADMIN)) {
1084 if ((ss->baud_base != MXSER_BAUD_BASE) ||
1085 (close_delay != port->close_delay) ||
1086 (closing_wait != port->closing_wait) ||
1087 ((ss->flags & ~ASYNC_USR_MASK) != (port->flags & ~ASYNC_USR_MASK))) {
1088 mutex_unlock(&port->mutex);
1089 return -EPERM;
1090 }
1091 port->flags = (port->flags & ~ASYNC_USR_MASK) |
1092 (ss->flags & ASYNC_USR_MASK);
1093 } else {
1094 /*
1095 * OK, past this point, all the error checking has been done.
1096 * At this point, we start making changes.....
1097 */
1098 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1099 (ss->flags & ASYNC_FLAGS));
1100 port->close_delay = close_delay;
1101 port->closing_wait = closing_wait;
1102 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1103 (ss->baud_base != MXSER_BAUD_BASE ||
1104 ss->custom_divisor !=
1105 MXSER_CUSTOM_DIVISOR)) {
1106 if (ss->custom_divisor == 0) {
1107 mutex_unlock(&port->mutex);
1108 return -EINVAL;
1109 }
1110 baud = ss->baud_base / ss->custom_divisor;
1111 tty_encode_baud_rate(tty, baud, baud);
1112 }
1113
1114 info->type = ss->type;
1115
1116 mxser_process_txrx_fifo(info);
1117 }
1118
1119 if (tty_port_initialized(port)) {
1120 if (old_speed != (port->flags & ASYNC_SPD_MASK)) {
1121 spin_lock_irqsave(&info->slock, sl_flags);
1122 mxser_change_speed(tty);
1123 spin_unlock_irqrestore(&info->slock, sl_flags);
1124 }
1125 } else {
1126 retval = mxser_activate(port, tty);
1127 if (retval == 0)
1128 tty_port_set_initialized(port, 1);
1129 }
1130 mutex_unlock(&port->mutex);
1131 return retval;
1132}
1133
1134/*
1135 * mxser_get_lsr_info - get line status register info
1136 *
1137 * Purpose: Let user call ioctl() to get info when the UART physically
1138 * is emptied. On bus types like RS485, the transmitter must
1139 * release the bus after transmitting. This must be done when
1140 * the transmit shift register is empty, not be done when the
1141 * transmit holding register is empty. This functionality
1142 * allows an RS485 driver to be written in user space.
1143 */
1144static int mxser_get_lsr_info(struct mxser_port *info,
1145 unsigned int __user *value)
1146{
1147 unsigned char status;
1148 unsigned int result;
1149 unsigned long flags;
1150
1151 spin_lock_irqsave(&info->slock, flags);
1152 status = inb(info->ioaddr + UART_LSR);
1153 spin_unlock_irqrestore(&info->slock, flags);
1154 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1155 return put_user(result, value);
1156}
1157
1158static int mxser_tiocmget(struct tty_struct *tty)
1159{
1160 struct mxser_port *info = tty->driver_data;
1161 unsigned char control, status;
1162 unsigned long flags;
1163
1164 if (tty_io_error(tty))
1165 return -EIO;
1166
1167 spin_lock_irqsave(&info->slock, flags);
1168 control = info->MCR;
1169 status = inb(info->ioaddr + UART_MSR);
1170 if (status & UART_MSR_ANY_DELTA)
1171 mxser_check_modem_status(tty, info, status);
1172 spin_unlock_irqrestore(&info->slock, flags);
1173
1174 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1175 ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1176 ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1177 ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1178 ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1179 ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1180}
1181
1182static int mxser_tiocmset(struct tty_struct *tty,
1183 unsigned int set, unsigned int clear)
1184{
1185 struct mxser_port *info = tty->driver_data;
1186 unsigned long flags;
1187
1188 if (tty_io_error(tty))
1189 return -EIO;
1190
1191 spin_lock_irqsave(&info->slock, flags);
1192
1193 if (set & TIOCM_RTS)
1194 info->MCR |= UART_MCR_RTS;
1195 if (set & TIOCM_DTR)
1196 info->MCR |= UART_MCR_DTR;
1197
1198 if (clear & TIOCM_RTS)
1199 info->MCR &= ~UART_MCR_RTS;
1200 if (clear & TIOCM_DTR)
1201 info->MCR &= ~UART_MCR_DTR;
1202
1203 outb(info->MCR, info->ioaddr + UART_MCR);
1204 spin_unlock_irqrestore(&info->slock, flags);
1205 return 0;
1206}
1207
1208static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1209 struct async_icount *cprev)
1210{
1211 struct async_icount cnow;
1212 unsigned long flags;
1213 int ret;
1214
1215 spin_lock_irqsave(&info->slock, flags);
1216 cnow = info->icount; /* atomic copy */
1217 spin_unlock_irqrestore(&info->slock, flags);
1218
1219 ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1220 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1221 ((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1222 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1223
1224 *cprev = cnow;
1225
1226 return ret;
1227}
1228
1229/* We should likely switch to TIOCGRS485/TIOCSRS485. */
1230static int mxser_ioctl_op_mode(struct mxser_port *port, int index, bool set,
1231 int __user *u_opmode)
1232{
1233 int opmode, p = index % 4;
1234 int shiftbit = p * 2;
1235 u8 val;
1236
1237 if (port->board->must_hwid != MOXA_MUST_MU860_HWID)
1238 return -EFAULT;
1239
1240 if (set) {
1241 if (get_user(opmode, u_opmode))
1242 return -EFAULT;
1243
1244 if (opmode & ~OP_MODE_MASK)
1245 return -EINVAL;
1246
1247 spin_lock_irq(&port->slock);
1248 val = inb(port->opmode_ioaddr);
1249 val &= ~(OP_MODE_MASK << shiftbit);
1250 val |= (opmode << shiftbit);
1251 outb(val, port->opmode_ioaddr);
1252 spin_unlock_irq(&port->slock);
1253
1254 return 0;
1255 }
1256
1257 spin_lock_irq(&port->slock);
1258 opmode = inb(port->opmode_ioaddr) >> shiftbit;
1259 spin_unlock_irq(&port->slock);
1260
1261 return put_user(opmode & OP_MODE_MASK, u_opmode);
1262}
1263
1264static int mxser_ioctl(struct tty_struct *tty,
1265 unsigned int cmd, unsigned long arg)
1266{
1267 struct mxser_port *info = tty->driver_data;
1268 struct async_icount cnow;
1269 unsigned long flags;
1270 void __user *argp = (void __user *)arg;
1271
1272 if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE)
1273 return mxser_ioctl_op_mode(info, tty->index,
1274 cmd == MOXA_SET_OP_MODE, argp);
1275
1276 if (cmd != TIOCMIWAIT && tty_io_error(tty))
1277 return -EIO;
1278
1279 switch (cmd) {
1280 case TIOCSERGETLSR: /* Get line status register */
1281 return mxser_get_lsr_info(info, argp);
1282 /*
1283 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1284 * - mask passed in arg for lines of interest
1285 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1286 * Caller should use TIOCGICOUNT to see which one it was
1287 */
1288 case TIOCMIWAIT:
1289 spin_lock_irqsave(&info->slock, flags);
1290 cnow = info->icount; /* note the counters on entry */
1291 spin_unlock_irqrestore(&info->slock, flags);
1292
1293 return wait_event_interruptible(info->port.delta_msr_wait,
1294 mxser_cflags_changed(info, arg, &cnow));
1295 default:
1296 return -ENOIOCTLCMD;
1297 }
1298 return 0;
1299}
1300
1301 /*
1302 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1303 * Return: write counters to the user passed counter struct
1304 * NB: both 1->0 and 0->1 transitions are counted except for
1305 * RI where only 0->1 is counted.
1306 */
1307
1308static int mxser_get_icount(struct tty_struct *tty,
1309 struct serial_icounter_struct *icount)
1310
1311{
1312 struct mxser_port *info = tty->driver_data;
1313 struct async_icount cnow;
1314 unsigned long flags;
1315
1316 spin_lock_irqsave(&info->slock, flags);
1317 cnow = info->icount;
1318 spin_unlock_irqrestore(&info->slock, flags);
1319
1320 icount->frame = cnow.frame;
1321 icount->brk = cnow.brk;
1322 icount->overrun = cnow.overrun;
1323 icount->buf_overrun = cnow.buf_overrun;
1324 icount->parity = cnow.parity;
1325 icount->rx = cnow.rx;
1326 icount->tx = cnow.tx;
1327 icount->cts = cnow.cts;
1328 icount->dsr = cnow.dsr;
1329 icount->rng = cnow.rng;
1330 icount->dcd = cnow.dcd;
1331 return 0;
1332}
1333
1334static void mxser_stoprx(struct tty_struct *tty)
1335{
1336 struct mxser_port *info = tty->driver_data;
1337
1338 info->ldisc_stop_rx = 1;
1339 if (I_IXOFF(tty)) {
1340 if (info->board->must_hwid) {
1341 info->IER &= ~MOXA_MUST_RECV_ISR;
1342 outb(info->IER, info->ioaddr + UART_IER);
1343 } else {
1344 info->x_char = STOP_CHAR(tty);
1345 outb(0, info->ioaddr + UART_IER);
1346 info->IER |= UART_IER_THRI;
1347 outb(info->IER, info->ioaddr + UART_IER);
1348 }
1349 }
1350
1351 if (C_CRTSCTS(tty)) {
1352 info->MCR &= ~UART_MCR_RTS;
1353 outb(info->MCR, info->ioaddr + UART_MCR);
1354 }
1355}
1356
1357/*
1358 * This routine is called by the upper-layer tty layer to signal that
1359 * incoming characters should be throttled.
1360 */
1361static void mxser_throttle(struct tty_struct *tty)
1362{
1363 mxser_stoprx(tty);
1364}
1365
1366static void mxser_unthrottle(struct tty_struct *tty)
1367{
1368 struct mxser_port *info = tty->driver_data;
1369
1370 /* startrx */
1371 info->ldisc_stop_rx = 0;
1372 if (I_IXOFF(tty)) {
1373 if (info->x_char)
1374 info->x_char = 0;
1375 else {
1376 if (info->board->must_hwid) {
1377 info->IER |= MOXA_MUST_RECV_ISR;
1378 outb(info->IER, info->ioaddr + UART_IER);
1379 } else {
1380 info->x_char = START_CHAR(tty);
1381 outb(0, info->ioaddr + UART_IER);
1382 info->IER |= UART_IER_THRI;
1383 outb(info->IER, info->ioaddr + UART_IER);
1384 }
1385 }
1386 }
1387
1388 if (C_CRTSCTS(tty)) {
1389 info->MCR |= UART_MCR_RTS;
1390 outb(info->MCR, info->ioaddr + UART_MCR);
1391 }
1392}
1393
1394/*
1395 * mxser_stop() and mxser_start()
1396 *
1397 * This routines are called before setting or resetting tty->flow.stopped.
1398 * They enable or disable transmitter interrupts, as necessary.
1399 */
1400static void mxser_stop(struct tty_struct *tty)
1401{
1402 struct mxser_port *info = tty->driver_data;
1403 unsigned long flags;
1404
1405 spin_lock_irqsave(&info->slock, flags);
1406 if (info->IER & UART_IER_THRI)
1407 __mxser_stop_tx(info);
1408 spin_unlock_irqrestore(&info->slock, flags);
1409}
1410
1411static void mxser_start(struct tty_struct *tty)
1412{
1413 struct mxser_port *info = tty->driver_data;
1414 unsigned long flags;
1415
1416 spin_lock_irqsave(&info->slock, flags);
1417 if (info->xmit_cnt && info->port.xmit_buf)
1418 __mxser_start_tx(info);
1419 spin_unlock_irqrestore(&info->slock, flags);
1420}
1421
1422static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1423{
1424 struct mxser_port *info = tty->driver_data;
1425 unsigned long flags;
1426
1427 spin_lock_irqsave(&info->slock, flags);
1428 mxser_change_speed(tty);
1429 spin_unlock_irqrestore(&info->slock, flags);
1430
1431 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1432 tty->hw_stopped = 0;
1433 mxser_start(tty);
1434 }
1435
1436 /* Handle sw stopped */
1437 if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1438 tty->flow.stopped = 0;
1439
1440 if (info->board->must_hwid) {
1441 spin_lock_irqsave(&info->slock, flags);
1442 mxser_must_set_rx_sw_flow_control(info->ioaddr, false);
1443 spin_unlock_irqrestore(&info->slock, flags);
1444 }
1445
1446 mxser_start(tty);
1447 }
1448}
1449
1450/*
1451 * mxser_wait_until_sent() --- wait until the transmitter is empty
1452 */
1453static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1454{
1455 struct mxser_port *info = tty->driver_data;
1456 unsigned long orig_jiffies, char_time;
1457 unsigned long flags;
1458 int lsr;
1459
1460 if (info->type == PORT_UNKNOWN)
1461 return;
1462
1463 if (info->xmit_fifo_size == 0)
1464 return; /* Just in case.... */
1465
1466 orig_jiffies = jiffies;
1467 /*
1468 * Set the check interval to be 1/5 of the estimated time to
1469 * send a single character, and make it at least 1. The check
1470 * interval should also be less than the timeout.
1471 *
1472 * Note: we have to use pretty tight timings here to satisfy
1473 * the NIST-PCTS.
1474 */
1475 char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1476 char_time = char_time / 5;
1477 if (char_time == 0)
1478 char_time = 1;
1479 if (timeout && timeout < char_time)
1480 char_time = timeout;
1481 /*
1482 * If the transmitter hasn't cleared in twice the approximate
1483 * amount of time to send the entire FIFO, it probably won't
1484 * ever clear. This assumes the UART isn't doing flow
1485 * control, which is currently the case. Hence, if it ever
1486 * takes longer than info->timeout, this is probably due to a
1487 * UART bug of some kind. So, we clamp the timeout parameter at
1488 * 2*info->timeout.
1489 */
1490 if (!timeout || timeout > 2 * info->timeout)
1491 timeout = 2 * info->timeout;
1492
1493 spin_lock_irqsave(&info->slock, flags);
1494 while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
1495 spin_unlock_irqrestore(&info->slock, flags);
1496 schedule_timeout_interruptible(char_time);
1497 spin_lock_irqsave(&info->slock, flags);
1498 if (signal_pending(current))
1499 break;
1500 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1501 break;
1502 }
1503 spin_unlock_irqrestore(&info->slock, flags);
1504 set_current_state(TASK_RUNNING);
1505}
1506
1507/*
1508 * This routine is called by tty_hangup() when a hangup is signaled.
1509 */
1510static void mxser_hangup(struct tty_struct *tty)
1511{
1512 struct mxser_port *info = tty->driver_data;
1513
1514 mxser_flush_buffer(tty);
1515 tty_port_hangup(&info->port);
1516}
1517
1518/*
1519 * mxser_rs_break() --- routine which turns the break handling on or off
1520 */
1521static int mxser_rs_break(struct tty_struct *tty, int break_state)
1522{
1523 struct mxser_port *info = tty->driver_data;
1524 unsigned long flags;
1525 u8 lcr;
1526
1527 spin_lock_irqsave(&info->slock, flags);
1528 lcr = inb(info->ioaddr + UART_LCR);
1529 if (break_state == -1)
1530 lcr |= UART_LCR_SBC;
1531 else
1532 lcr &= ~UART_LCR_SBC;
1533 outb(lcr, info->ioaddr + UART_LCR);
1534 spin_unlock_irqrestore(&info->slock, flags);
1535
1536 return 0;
1537}
1538
1539static bool mxser_receive_chars_new(struct tty_struct *tty,
1540 struct mxser_port *port, u8 status)
1541{
1542 enum mxser_must_hwid hwid = port->board->must_hwid;
1543 u8 gdl;
1544
1545 if (hwid == MOXA_OTHER_UART)
1546 return false;
1547 if (status & UART_LSR_BRK_ERROR_BITS)
1548 return false;
1549 if (hwid == MOXA_MUST_MU860_HWID && (status & MOXA_MUST_LSR_RERR))
1550 return false;
1551 if (status & MOXA_MUST_LSR_RERR)
1552 return false;
1553
1554 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
1555 if (hwid == MOXA_MUST_MU150_HWID)
1556 gdl &= MOXA_MUST_GDL_MASK;
1557
1558 if (gdl >= tty->receive_room && !port->ldisc_stop_rx)
1559 mxser_stoprx(tty);
1560
1561 while (gdl--) {
1562 u8 ch = inb(port->ioaddr + UART_RX);
1563 tty_insert_flip_char(&port->port, ch, 0);
1564 }
1565
1566 return true;
1567}
1568
1569static u8 mxser_receive_chars_old(struct tty_struct *tty,
1570 struct mxser_port *port, u8 status)
1571{
1572 enum mxser_must_hwid hwid = port->board->must_hwid;
1573 int recv_room = tty->receive_room;
1574 int ignored = 0;
1575 int max = 256;
1576 int cnt = 0;
1577 u8 ch;
1578
1579 do {
1580 if (max-- < 0)
1581 break;
1582
1583 ch = inb(port->ioaddr + UART_RX);
1584 if (hwid && (status & UART_LSR_OE))
1585 outb(UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
1586 MOXA_MUST_FCR_GDA_MODE_ENABLE,
1587 port->ioaddr + UART_FCR);
1588 status &= port->read_status_mask;
1589 if (status & port->ignore_status_mask) {
1590 if (++ignored > 100)
1591 break;
1592 } else {
1593 char flag = 0;
1594 if (status & UART_LSR_BRK_ERROR_BITS) {
1595 if (status & UART_LSR_BI) {
1596 flag = TTY_BREAK;
1597 port->icount.brk++;
1598
1599 if (port->port.flags & ASYNC_SAK)
1600 do_SAK(tty);
1601 } else if (status & UART_LSR_PE) {
1602 flag = TTY_PARITY;
1603 port->icount.parity++;
1604 } else if (status & UART_LSR_FE) {
1605 flag = TTY_FRAME;
1606 port->icount.frame++;
1607 } else if (status & UART_LSR_OE) {
1608 flag = TTY_OVERRUN;
1609 port->icount.overrun++;
1610 }
1611 }
1612 tty_insert_flip_char(&port->port, ch, flag);
1613 cnt++;
1614 if (cnt >= recv_room) {
1615 if (!port->ldisc_stop_rx)
1616 mxser_stoprx(tty);
1617 break;
1618 }
1619
1620 }
1621
1622 if (hwid)
1623 break;
1624
1625 status = inb(port->ioaddr + UART_LSR);
1626 } while (status & UART_LSR_DR);
1627
1628 return status;
1629}
1630
1631static u8 mxser_receive_chars(struct tty_struct *tty,
1632 struct mxser_port *port, u8 status)
1633{
1634 if (tty->receive_room == 0 && !port->ldisc_stop_rx)
1635 mxser_stoprx(tty);
1636
1637 if (!mxser_receive_chars_new(tty, port, status))
1638 status = mxser_receive_chars_old(tty, port, status);
1639
1640 tty_flip_buffer_push(&port->port);
1641
1642 return status;
1643}
1644
1645static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
1646{
1647 int count, cnt;
1648
1649 if (port->x_char) {
1650 outb(port->x_char, port->ioaddr + UART_TX);
1651 port->x_char = 0;
1652 port->icount.tx++;
1653 return;
1654 }
1655
1656 if (port->port.xmit_buf == NULL)
1657 return;
1658
1659 if (!port->xmit_cnt || tty->flow.stopped ||
1660 (tty->hw_stopped && !mxser_16550A_or_MUST(port))) {
1661 __mxser_stop_tx(port);
1662 return;
1663 }
1664
1665 cnt = port->xmit_cnt;
1666 count = port->xmit_fifo_size;
1667 do {
1668 outb(port->port.xmit_buf[port->xmit_tail++],
1669 port->ioaddr + UART_TX);
1670 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
1671 if (!--port->xmit_cnt)
1672 break;
1673 } while (--count > 0);
1674
1675 port->icount.tx += (cnt - port->xmit_cnt);
1676
1677 if (port->xmit_cnt < WAKEUP_CHARS)
1678 tty_wakeup(tty);
1679
1680 if (!port->xmit_cnt)
1681 __mxser_stop_tx(port);
1682}
1683
1684static bool mxser_port_isr(struct mxser_port *port)
1685{
1686 struct tty_struct *tty;
1687 u8 iir, msr, status;
1688 bool error = false;
1689
1690 iir = inb(port->ioaddr + UART_IIR);
1691 if (iir & UART_IIR_NO_INT)
1692 return true;
1693
1694 iir &= MOXA_MUST_IIR_MASK;
1695 tty = tty_port_tty_get(&port->port);
1696 if (!tty || port->closing || !tty_port_initialized(&port->port)) {
1697 status = inb(port->ioaddr + UART_LSR);
1698 outb(MOXA_MUST_FCR_GDA_MODE_ENABLE | UART_FCR_ENABLE_FIFO |
1699 UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1700 port->ioaddr + UART_FCR);
1701 inb(port->ioaddr + UART_MSR);
1702
1703 error = true;
1704 goto put_tty;
1705 }
1706
1707 status = inb(port->ioaddr + UART_LSR);
1708
1709 if (port->board->must_hwid) {
1710 if (iir == MOXA_MUST_IIR_GDA ||
1711 iir == MOXA_MUST_IIR_RDA ||
1712 iir == MOXA_MUST_IIR_RTO ||
1713 iir == MOXA_MUST_IIR_LSR)
1714 status = mxser_receive_chars(tty, port, status);
1715 } else {
1716 status &= port->read_status_mask;
1717 if (status & UART_LSR_DR)
1718 status = mxser_receive_chars(tty, port, status);
1719 }
1720
1721 msr = inb(port->ioaddr + UART_MSR);
1722 if (msr & UART_MSR_ANY_DELTA)
1723 mxser_check_modem_status(tty, port, msr);
1724
1725 if (port->board->must_hwid) {
1726 if (iir == 0x02 && (status & UART_LSR_THRE))
1727 mxser_transmit_chars(tty, port);
1728 } else {
1729 if (status & UART_LSR_THRE)
1730 mxser_transmit_chars(tty, port);
1731 }
1732
1733put_tty:
1734 tty_kref_put(tty);
1735
1736 return error;
1737}
1738
1739/*
1740 * This is the serial driver's generic interrupt routine
1741 */
1742static irqreturn_t mxser_interrupt(int irq, void *dev_id)
1743{
1744 struct mxser_board *brd = dev_id;
1745 struct mxser_port *port;
1746 unsigned int int_cnt, pass_counter = 0;
1747 unsigned int i, max = brd->nports;
1748 int handled = IRQ_NONE;
1749 u8 irqbits, bits, mask = BIT(max) - 1;
1750
1751 while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
1752 irqbits = inb(brd->vector) & mask;
1753 if (irqbits == mask)
1754 break;
1755
1756 handled = IRQ_HANDLED;
1757 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
1758 if (irqbits == mask)
1759 break;
1760 if (bits & irqbits)
1761 continue;
1762 port = &brd->ports[i];
1763
1764 int_cnt = 0;
1765 spin_lock(&port->slock);
1766 do {
1767 if (mxser_port_isr(port))
1768 break;
1769 } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
1770 spin_unlock(&port->slock);
1771 }
1772 }
1773
1774 return handled;
1775}
1776
1777static const struct tty_operations mxser_ops = {
1778 .open = mxser_open,
1779 .close = mxser_close,
1780 .write = mxser_write,
1781 .put_char = mxser_put_char,
1782 .flush_chars = mxser_flush_chars,
1783 .write_room = mxser_write_room,
1784 .chars_in_buffer = mxser_chars_in_buffer,
1785 .flush_buffer = mxser_flush_buffer,
1786 .ioctl = mxser_ioctl,
1787 .throttle = mxser_throttle,
1788 .unthrottle = mxser_unthrottle,
1789 .set_termios = mxser_set_termios,
1790 .stop = mxser_stop,
1791 .start = mxser_start,
1792 .hangup = mxser_hangup,
1793 .break_ctl = mxser_rs_break,
1794 .wait_until_sent = mxser_wait_until_sent,
1795 .tiocmget = mxser_tiocmget,
1796 .tiocmset = mxser_tiocmset,
1797 .set_serial = mxser_set_serial_info,
1798 .get_serial = mxser_get_serial_info,
1799 .get_icount = mxser_get_icount,
1800};
1801
1802static const struct tty_port_operations mxser_port_ops = {
1803 .carrier_raised = mxser_carrier_raised,
1804 .dtr_rts = mxser_dtr_rts,
1805 .activate = mxser_activate,
1806 .shutdown = mxser_shutdown_port,
1807};
1808
1809/*
1810 * The MOXA Smartio/Industio serial driver boot-time initialization code!
1811 */
1812
1813static void mxser_initbrd(struct mxser_board *brd, bool high_baud)
1814{
1815 struct mxser_port *info;
1816 unsigned int i;
1817 bool is_mu860;
1818
1819 brd->must_hwid = mxser_must_get_hwid(brd->ports[0].ioaddr);
1820 is_mu860 = brd->must_hwid == MOXA_MUST_MU860_HWID;
1821
1822 for (i = 0; i < UART_INFO_NUM; i++) {
1823 if (Gpci_uart_info[i].type == brd->must_hwid) {
1824 brd->max_baud = Gpci_uart_info[i].max_baud;
1825
1826 /* exception....CP-102 */
1827 if (high_baud)
1828 brd->max_baud = 921600;
1829 break;
1830 }
1831 }
1832
1833 if (is_mu860) {
1834 /* set to RS232 mode by default */
1835 outb(0, brd->vector + 4);
1836 outb(0, brd->vector + 0x0c);
1837 }
1838
1839 for (i = 0; i < brd->nports; i++) {
1840 info = &brd->ports[i];
1841 if (is_mu860) {
1842 if (i < 4)
1843 info->opmode_ioaddr = brd->vector + 4;
1844 else
1845 info->opmode_ioaddr = brd->vector + 0x0c;
1846 }
1847 tty_port_init(&info->port);
1848 info->port.ops = &mxser_port_ops;
1849 info->board = brd;
1850 info->ldisc_stop_rx = 0;
1851
1852 /* Enhance mode enabled here */
1853 if (brd->must_hwid != MOXA_OTHER_UART)
1854 mxser_must_set_enhance_mode(info->ioaddr, true);
1855
1856 info->type = PORT_16550A;
1857
1858 mxser_process_txrx_fifo(info);
1859
1860 info->port.close_delay = 5 * HZ / 10;
1861 info->port.closing_wait = 30 * HZ;
1862 spin_lock_init(&info->slock);
1863
1864 /* before set INT ISR, disable all int */
1865 outb(inb(info->ioaddr + UART_IER) & 0xf0,
1866 info->ioaddr + UART_IER);
1867 }
1868}
1869
1870static int mxser_probe(struct pci_dev *pdev,
1871 const struct pci_device_id *ent)
1872{
1873 struct mxser_board *brd;
1874 unsigned int i, base;
1875 unsigned long ioaddress;
1876 unsigned short nports = MXSER_NPORTS(ent->driver_data);
1877 struct device *tty_dev;
1878 int retval = -EINVAL;
1879
1880 i = find_first_zero_bit(mxser_boards, MXSER_BOARDS);
1881 if (i >= MXSER_BOARDS) {
1882 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
1883 "not configured\n", MXSER_BOARDS);
1884 goto err;
1885 }
1886
1887 brd = devm_kzalloc(&pdev->dev, struct_size(brd, ports, nports),
1888 GFP_KERNEL);
1889 if (!brd)
1890 goto err;
1891
1892 brd->idx = i;
1893 __set_bit(brd->idx, mxser_boards);
1894 base = i * MXSER_PORTS_PER_BOARD;
1895
1896 retval = pcim_enable_device(pdev);
1897 if (retval) {
1898 dev_err(&pdev->dev, "PCI enable failed\n");
1899 goto err_zero;
1900 }
1901
1902 /* io address */
1903 ioaddress = pci_resource_start(pdev, 2);
1904 retval = pci_request_region(pdev, 2, "mxser(IO)");
1905 if (retval)
1906 goto err_zero;
1907
1908 brd->nports = nports;
1909 for (i = 0; i < nports; i++)
1910 brd->ports[i].ioaddr = ioaddress + 8 * i;
1911
1912 /* vector */
1913 ioaddress = pci_resource_start(pdev, 3);
1914 retval = pci_request_region(pdev, 3, "mxser(vector)");
1915 if (retval)
1916 goto err_zero;
1917 brd->vector = ioaddress;
1918
1919 /* irq */
1920 brd->irq = pdev->irq;
1921
1922 mxser_initbrd(brd, ent->driver_data & MXSER_HIGHBAUD);
1923
1924 retval = devm_request_irq(&pdev->dev, brd->irq, mxser_interrupt,
1925 IRQF_SHARED, "mxser", brd);
1926 if (retval) {
1927 dev_err(&pdev->dev, "request irq failed");
1928 goto err_relbrd;
1929 }
1930
1931 for (i = 0; i < nports; i++) {
1932 tty_dev = tty_port_register_device(&brd->ports[i].port,
1933 mxvar_sdriver, base + i, &pdev->dev);
1934 if (IS_ERR(tty_dev)) {
1935 retval = PTR_ERR(tty_dev);
1936 for (; i > 0; i--)
1937 tty_unregister_device(mxvar_sdriver,
1938 base + i - 1);
1939 goto err_relbrd;
1940 }
1941 }
1942
1943 pci_set_drvdata(pdev, brd);
1944
1945 return 0;
1946err_relbrd:
1947 for (i = 0; i < nports; i++)
1948 tty_port_destroy(&brd->ports[i].port);
1949err_zero:
1950 __clear_bit(brd->idx, mxser_boards);
1951err:
1952 return retval;
1953}
1954
1955static void mxser_remove(struct pci_dev *pdev)
1956{
1957 struct mxser_board *brd = pci_get_drvdata(pdev);
1958 unsigned int i, base = brd->idx * MXSER_PORTS_PER_BOARD;
1959
1960 for (i = 0; i < brd->nports; i++) {
1961 tty_unregister_device(mxvar_sdriver, base + i);
1962 tty_port_destroy(&brd->ports[i].port);
1963 }
1964
1965 __clear_bit(brd->idx, mxser_boards);
1966}
1967
1968static struct pci_driver mxser_driver = {
1969 .name = "mxser",
1970 .id_table = mxser_pcibrds,
1971 .probe = mxser_probe,
1972 .remove = mxser_remove
1973};
1974
1975static int __init mxser_module_init(void)
1976{
1977 int retval;
1978
1979 mxvar_sdriver = alloc_tty_driver(MXSER_PORTS);
1980 if (!mxvar_sdriver)
1981 return -ENOMEM;
1982
1983 /* Initialize the tty_driver structure */
1984 mxvar_sdriver->name = "ttyMI";
1985 mxvar_sdriver->major = ttymajor;
1986 mxvar_sdriver->minor_start = 0;
1987 mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
1988 mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
1989 mxvar_sdriver->init_termios = tty_std_termios;
1990 mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
1991 mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
1992 tty_set_operations(mxvar_sdriver, &mxser_ops);
1993
1994 retval = tty_register_driver(mxvar_sdriver);
1995 if (retval) {
1996 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
1997 "tty driver !\n");
1998 goto err_put;
1999 }
2000
2001 retval = pci_register_driver(&mxser_driver);
2002 if (retval) {
2003 printk(KERN_ERR "mxser: can't register pci driver\n");
2004 goto err_unr;
2005 }
2006
2007 return 0;
2008err_unr:
2009 tty_unregister_driver(mxvar_sdriver);
2010err_put:
2011 put_tty_driver(mxvar_sdriver);
2012 return retval;
2013}
2014
2015static void __exit mxser_module_exit(void)
2016{
2017 pci_unregister_driver(&mxser_driver);
2018 tty_unregister_driver(mxvar_sdriver);
2019 put_tty_driver(mxvar_sdriver);
2020}
2021
2022module_init(mxser_module_init);
2023module_exit(mxser_module_exit);