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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/*
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_MOXA_RC7000 0x0001
163#define PCI_DEVICE_ID_MOXA_CP102 0x1020
164#define PCI_DEVICE_ID_MOXA_CP102UL 0x1021
165#define PCI_DEVICE_ID_MOXA_CP102U 0x1022
166#define PCI_DEVICE_ID_MOXA_CP102UF 0x1023
167#define PCI_DEVICE_ID_MOXA_C104 0x1040
168#define PCI_DEVICE_ID_MOXA_CP104U 0x1041
169#define PCI_DEVICE_ID_MOXA_CP104JU 0x1042
170#define PCI_DEVICE_ID_MOXA_CP104EL 0x1043
171#define PCI_DEVICE_ID_MOXA_POS104UL 0x1044
172#define PCI_DEVICE_ID_MOXA_CB108 0x1080
173#define PCI_DEVICE_ID_MOXA_CP112UL 0x1120
174#define PCI_DEVICE_ID_MOXA_CT114 0x1140
175#define PCI_DEVICE_ID_MOXA_CP114 0x1141
176#define PCI_DEVICE_ID_MOXA_CB114 0x1142
177#define PCI_DEVICE_ID_MOXA_CP114UL 0x1143
178#define PCI_DEVICE_ID_MOXA_CP118U 0x1180
179#define PCI_DEVICE_ID_MOXA_CP118EL 0x1181
180#define PCI_DEVICE_ID_MOXA_CP132 0x1320
181#define PCI_DEVICE_ID_MOXA_CP132U 0x1321
182#define PCI_DEVICE_ID_MOXA_CP134U 0x1340
183#define PCI_DEVICE_ID_MOXA_CB134I 0x1341
184#define PCI_DEVICE_ID_MOXA_CP138U 0x1380
185#define PCI_DEVICE_ID_MOXA_C168 0x1680
186#define PCI_DEVICE_ID_MOXA_CP168U 0x1681
187#define PCI_DEVICE_ID_MOXA_CP168EL 0x1682
188
189#define MXSER_NPORTS(ddata) ((ddata) & 0xffU)
190#define MXSER_HIGHBAUD 0x0100
191
192enum mxser_must_hwid {
193 MOXA_OTHER_UART = 0x00,
194 MOXA_MUST_MU150_HWID = 0x01,
195 MOXA_MUST_MU860_HWID = 0x02,
196};
197
198static const struct {
199 u8 type;
200 u8 fifo_size;
201 u8 rx_high_water;
202 u8 rx_low_water;
203 speed_t max_baud;
204} Gpci_uart_info[] = {
205 { MOXA_OTHER_UART, 16, 14, 1, 921600 },
206 { MOXA_MUST_MU150_HWID, 64, 48, 16, 230400 },
207 { MOXA_MUST_MU860_HWID, 128, 96, 32, 921600 }
208};
209#define UART_INFO_NUM ARRAY_SIZE(Gpci_uart_info)
210
211
212/* driver_data correspond to the lines in the structure above
213 see also ISA probe function before you change something */
214static const struct pci_device_id mxser_pcibrds[] = {
215 { PCI_DEVICE_DATA(MOXA, C168, 8) },
216 { PCI_DEVICE_DATA(MOXA, C104, 4) },
217 { PCI_DEVICE_DATA(MOXA, CP132, 2) },
218 { PCI_DEVICE_DATA(MOXA, CP114, 4) },
219 { PCI_DEVICE_DATA(MOXA, CT114, 4) },
220 { PCI_DEVICE_DATA(MOXA, CP102, 2 | MXSER_HIGHBAUD) },
221 { PCI_DEVICE_DATA(MOXA, CP104U, 4) },
222 { PCI_DEVICE_DATA(MOXA, CP168U, 8) },
223 { PCI_DEVICE_DATA(MOXA, CP132U, 2) },
224 { PCI_DEVICE_DATA(MOXA, CP134U, 4) },
225 { PCI_DEVICE_DATA(MOXA, CP104JU, 4) },
226 { PCI_DEVICE_DATA(MOXA, RC7000, 8) }, /* RC7000 */
227 { PCI_DEVICE_DATA(MOXA, CP118U, 8) },
228 { PCI_DEVICE_DATA(MOXA, CP102UL, 2) },
229 { PCI_DEVICE_DATA(MOXA, CP102U, 2) },
230 { PCI_DEVICE_DATA(MOXA, CP118EL, 8) },
231 { PCI_DEVICE_DATA(MOXA, CP168EL, 8) },
232 { PCI_DEVICE_DATA(MOXA, CP104EL, 4) },
233 { PCI_DEVICE_DATA(MOXA, CB108, 8) },
234 { PCI_DEVICE_DATA(MOXA, CB114, 4) },
235 { PCI_DEVICE_DATA(MOXA, CB134I, 4) },
236 { PCI_DEVICE_DATA(MOXA, CP138U, 8) },
237 { PCI_DEVICE_DATA(MOXA, POS104UL, 4) },
238 { PCI_DEVICE_DATA(MOXA, CP114UL, 4) },
239 { PCI_DEVICE_DATA(MOXA, CP102UF, 2) },
240 { PCI_DEVICE_DATA(MOXA, CP112UL, 2) },
241 { }
242};
243MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
244
245static int ttymajor = MXSERMAJOR;
246
247/* Variables for insmod */
248
249MODULE_AUTHOR("Casper Yang");
250MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
251module_param(ttymajor, int, 0);
252MODULE_LICENSE("GPL");
253
254struct mxser_board;
255
256struct mxser_port {
257 struct tty_port port;
258 struct mxser_board *board;
259
260 unsigned long ioaddr;
261 unsigned long opmode_ioaddr;
262
263 u8 rx_high_water;
264 u8 rx_low_water;
265 int type; /* UART type */
266
267 u8 x_char; /* xon/xoff character */
268 u8 IER; /* Interrupt Enable Register */
269 u8 MCR; /* Modem control register */
270 u8 FCR; /* FIFO control register */
271
272 struct async_icount icount; /* kernel counters for 4 input interrupts */
273 unsigned int timeout;
274
275 u8 read_status_mask;
276 u8 ignore_status_mask;
277 u8 xmit_fifo_size;
278
279 spinlock_t slock;
280};
281
282struct mxser_board {
283 unsigned int idx;
284 unsigned short nports;
285 int irq;
286 unsigned long vector;
287
288 enum mxser_must_hwid must_hwid;
289 speed_t max_baud;
290
291 struct mxser_port ports[] __counted_by(nports);
292};
293
294static DECLARE_BITMAP(mxser_boards, MXSER_BOARDS);
295static struct tty_driver *mxvar_sdriver;
296
297static u8 __mxser_must_set_EFR(unsigned long baseio, u8 clear, u8 set,
298 bool restore_LCR)
299{
300 u8 oldlcr, efr;
301
302 oldlcr = inb(baseio + UART_LCR);
303 outb(MOXA_MUST_ENTER_ENHANCED, baseio + UART_LCR);
304
305 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
306 efr &= ~clear;
307 efr |= set;
308
309 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
310
311 if (restore_LCR)
312 outb(oldlcr, baseio + UART_LCR);
313
314 return oldlcr;
315}
316
317static u8 mxser_must_select_bank(unsigned long baseio, u8 bank)
318{
319 return __mxser_must_set_EFR(baseio, MOXA_MUST_EFR_BANK_MASK, bank,
320 false);
321}
322
323static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
324{
325 u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK0);
326 outb(value, baseio + MOXA_MUST_XON1_REGISTER);
327 outb(oldlcr, baseio + UART_LCR);
328}
329
330static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
331{
332 u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK0);
333 outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
334 outb(oldlcr, baseio + UART_LCR);
335}
336
337static void mxser_set_must_fifo_value(struct mxser_port *info)
338{
339 u8 oldlcr = mxser_must_select_bank(info->ioaddr, MOXA_MUST_EFR_BANK1);
340 outb(info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
341 outb(info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
342 outb(info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
343 outb(oldlcr, info->ioaddr + UART_LCR);
344}
345
346static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
347{
348 u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK2);
349 outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
350 outb(oldlcr, baseio + UART_LCR);
351}
352
353static u8 mxser_get_must_hardware_id(unsigned long baseio)
354{
355 u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK2);
356 u8 id = inb(baseio + MOXA_MUST_HWID_REGISTER);
357 outb(oldlcr, baseio + UART_LCR);
358
359 return id;
360}
361
362static void mxser_must_set_EFR(unsigned long baseio, u8 clear, u8 set)
363{
364 __mxser_must_set_EFR(baseio, clear, set, true);
365}
366
367static void mxser_must_set_enhance_mode(unsigned long baseio, bool enable)
368{
369 mxser_must_set_EFR(baseio,
370 enable ? 0 : MOXA_MUST_EFR_EFRB_ENABLE,
371 enable ? MOXA_MUST_EFR_EFRB_ENABLE : 0);
372}
373
374static void mxser_must_no_sw_flow_control(unsigned long baseio)
375{
376 mxser_must_set_EFR(baseio, MOXA_MUST_EFR_SF_MASK, 0);
377}
378
379static void mxser_must_set_tx_sw_flow_control(unsigned long baseio, bool enable)
380{
381 mxser_must_set_EFR(baseio, MOXA_MUST_EFR_SF_TX_MASK,
382 enable ? MOXA_MUST_EFR_SF_TX1 : 0);
383}
384
385static void mxser_must_set_rx_sw_flow_control(unsigned long baseio, bool enable)
386{
387 mxser_must_set_EFR(baseio, MOXA_MUST_EFR_SF_RX_MASK,
388 enable ? MOXA_MUST_EFR_SF_RX1 : 0);
389}
390
391static enum mxser_must_hwid mxser_must_get_hwid(unsigned long io)
392{
393 u8 oldmcr, hwid;
394 int i;
395
396 outb(0, io + UART_LCR);
397 mxser_must_set_enhance_mode(io, false);
398 oldmcr = inb(io + UART_MCR);
399 outb(0, io + UART_MCR);
400 mxser_set_must_xon1_value(io, 0x11);
401 if (inb(io + UART_MCR) != 0) {
402 outb(oldmcr, io + UART_MCR);
403 return MOXA_OTHER_UART;
404 }
405
406 hwid = mxser_get_must_hardware_id(io);
407 for (i = 1; i < UART_INFO_NUM; i++) /* 0 = OTHER_UART */
408 if (hwid == Gpci_uart_info[i].type)
409 return hwid;
410
411 return MOXA_OTHER_UART;
412}
413
414static bool mxser_16550A_or_MUST(struct mxser_port *info)
415{
416 return info->type == PORT_16550A || info->board->must_hwid;
417}
418
419static void mxser_process_txrx_fifo(struct mxser_port *info)
420{
421 unsigned int i;
422
423 if (info->type == PORT_16450 || info->type == PORT_8250) {
424 info->rx_high_water = 1;
425 info->rx_low_water = 1;
426 info->xmit_fifo_size = 1;
427 return;
428 }
429
430 for (i = 0; i < UART_INFO_NUM; i++)
431 if (info->board->must_hwid == Gpci_uart_info[i].type) {
432 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
433 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
434 info->xmit_fifo_size = Gpci_uart_info[i].fifo_size;
435 break;
436 }
437}
438
439static void __mxser_start_tx(struct mxser_port *info)
440{
441 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
442 info->IER |= UART_IER_THRI;
443 outb(info->IER, info->ioaddr + UART_IER);
444}
445
446static void mxser_start_tx(struct mxser_port *info)
447{
448 unsigned long flags;
449
450 spin_lock_irqsave(&info->slock, flags);
451 __mxser_start_tx(info);
452 spin_unlock_irqrestore(&info->slock, flags);
453}
454
455static void __mxser_stop_tx(struct mxser_port *info)
456{
457 info->IER &= ~UART_IER_THRI;
458 outb(info->IER, info->ioaddr + UART_IER);
459}
460
461static bool mxser_carrier_raised(struct tty_port *port)
462{
463 struct mxser_port *mp = container_of(port, struct mxser_port, port);
464
465 return inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD;
466}
467
468static void mxser_dtr_rts(struct tty_port *port, bool active)
469{
470 struct mxser_port *mp = container_of(port, struct mxser_port, port);
471 unsigned long flags;
472 u8 mcr;
473
474 spin_lock_irqsave(&mp->slock, flags);
475 mcr = inb(mp->ioaddr + UART_MCR);
476 if (active)
477 mcr |= UART_MCR_DTR | UART_MCR_RTS;
478 else
479 mcr &= ~(UART_MCR_DTR | UART_MCR_RTS);
480 outb(mcr, mp->ioaddr + UART_MCR);
481 spin_unlock_irqrestore(&mp->slock, flags);
482}
483
484static int mxser_set_baud(struct tty_struct *tty, speed_t newspd)
485{
486 struct mxser_port *info = tty->driver_data;
487 unsigned int quot = 0, baud;
488 unsigned char cval;
489 u64 timeout;
490
491 if (newspd > info->board->max_baud)
492 return -1;
493
494 if (newspd == 134) {
495 quot = 2 * MXSER_BAUD_BASE / 269;
496 tty_encode_baud_rate(tty, 134, 134);
497 } else if (newspd) {
498 quot = MXSER_BAUD_BASE / newspd;
499 if (quot == 0)
500 quot = 1;
501 baud = MXSER_BAUD_BASE / quot;
502 tty_encode_baud_rate(tty, baud, baud);
503 } else {
504 quot = 0;
505 }
506
507 /*
508 * worst case (128 * 1000 * 10 * 18432) needs 35 bits, so divide in the
509 * u64 domain
510 */
511 timeout = (u64)info->xmit_fifo_size * HZ * 10 * quot;
512 do_div(timeout, MXSER_BAUD_BASE);
513 info->timeout = timeout + HZ / 50; /* Add .02 seconds of slop */
514
515 if (quot) {
516 info->MCR |= UART_MCR_DTR;
517 outb(info->MCR, info->ioaddr + UART_MCR);
518 } else {
519 info->MCR &= ~UART_MCR_DTR;
520 outb(info->MCR, info->ioaddr + UART_MCR);
521 return 0;
522 }
523
524 cval = inb(info->ioaddr + UART_LCR);
525
526 outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR); /* set DLAB */
527
528 outb(quot & 0xff, info->ioaddr + UART_DLL); /* LS of divisor */
529 outb(quot >> 8, info->ioaddr + UART_DLM); /* MS of divisor */
530 outb(cval, info->ioaddr + UART_LCR); /* reset DLAB */
531
532 if (C_BAUD(tty) == BOTHER) {
533 quot = MXSER_BAUD_BASE % newspd;
534 quot *= 8;
535 if (quot % newspd > newspd / 2) {
536 quot /= newspd;
537 quot++;
538 } else
539 quot /= newspd;
540
541 mxser_set_must_enum_value(info->ioaddr, quot);
542 } else {
543 mxser_set_must_enum_value(info->ioaddr, 0);
544 }
545
546 return 0;
547}
548
549static void mxser_handle_cts(struct tty_struct *tty, struct mxser_port *info,
550 u8 msr)
551{
552 bool cts = msr & UART_MSR_CTS;
553
554 if (tty->hw_stopped) {
555 if (cts) {
556 tty->hw_stopped = false;
557
558 if (!mxser_16550A_or_MUST(info))
559 __mxser_start_tx(info);
560 tty_wakeup(tty);
561 }
562 return;
563 } else if (cts)
564 return;
565
566 tty->hw_stopped = true;
567 if (!mxser_16550A_or_MUST(info))
568 __mxser_stop_tx(info);
569}
570
571/*
572 * This routine is called to set the UART divisor registers to match
573 * the specified baud rate for a serial port.
574 */
575static void mxser_change_speed(struct tty_struct *tty,
576 const struct ktermios *old_termios)
577{
578 struct mxser_port *info = tty->driver_data;
579 unsigned cflag, cval;
580
581 cflag = tty->termios.c_cflag;
582
583 if (mxser_set_baud(tty, tty_get_baud_rate(tty))) {
584 /* Use previous rate on a failure */
585 if (old_termios) {
586 speed_t baud = tty_termios_baud_rate(old_termios);
587 tty_encode_baud_rate(tty, baud, baud);
588 }
589 }
590
591 /* byte size and parity */
592 cval = UART_LCR_WLEN(tty_get_char_size(tty->termios.c_cflag));
593
594 if (cflag & CSTOPB)
595 cval |= UART_LCR_STOP;
596 if (cflag & PARENB)
597 cval |= UART_LCR_PARITY;
598 if (!(cflag & PARODD))
599 cval |= UART_LCR_EPAR;
600 if (cflag & CMSPAR)
601 cval |= UART_LCR_SPAR;
602
603 info->FCR = 0;
604 if (info->board->must_hwid) {
605 info->FCR |= UART_FCR_ENABLE_FIFO |
606 MOXA_MUST_FCR_GDA_MODE_ENABLE;
607 mxser_set_must_fifo_value(info);
608 } else if (info->type != PORT_8250 && info->type != PORT_16450) {
609 info->FCR |= UART_FCR_ENABLE_FIFO;
610 switch (info->rx_high_water) {
611 case 1:
612 info->FCR |= UART_FCR_TRIGGER_1;
613 break;
614 case 4:
615 info->FCR |= UART_FCR_TRIGGER_4;
616 break;
617 case 8:
618 info->FCR |= UART_FCR_TRIGGER_8;
619 break;
620 default:
621 info->FCR |= UART_FCR_TRIGGER_14;
622 break;
623 }
624 }
625
626 /* CTS flow control flag and modem status interrupts */
627 info->IER &= ~UART_IER_MSI;
628 info->MCR &= ~UART_MCR_AFE;
629 tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
630 if (cflag & CRTSCTS) {
631 info->IER |= UART_IER_MSI;
632 if (mxser_16550A_or_MUST(info)) {
633 info->MCR |= UART_MCR_AFE;
634 } else {
635 mxser_handle_cts(tty, info,
636 inb(info->ioaddr + UART_MSR));
637 }
638 }
639 outb(info->MCR, info->ioaddr + UART_MCR);
640 tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
641 if (~cflag & CLOCAL)
642 info->IER |= UART_IER_MSI;
643 outb(info->IER, info->ioaddr + UART_IER);
644
645 /*
646 * Set up parity check flag
647 */
648 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
649 if (I_INPCK(tty))
650 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
651 if (I_BRKINT(tty) || I_PARMRK(tty))
652 info->read_status_mask |= UART_LSR_BI;
653
654 info->ignore_status_mask = 0;
655
656 if (I_IGNBRK(tty)) {
657 info->ignore_status_mask |= UART_LSR_BI;
658 info->read_status_mask |= UART_LSR_BI;
659 /*
660 * If we're ignore parity and break indicators, ignore
661 * overruns too. (For real raw support).
662 */
663 if (I_IGNPAR(tty)) {
664 info->ignore_status_mask |=
665 UART_LSR_OE |
666 UART_LSR_PE |
667 UART_LSR_FE;
668 info->read_status_mask |=
669 UART_LSR_OE |
670 UART_LSR_PE |
671 UART_LSR_FE;
672 }
673 }
674 if (info->board->must_hwid) {
675 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
676 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
677 mxser_must_set_rx_sw_flow_control(info->ioaddr, I_IXON(tty));
678 mxser_must_set_tx_sw_flow_control(info->ioaddr, I_IXOFF(tty));
679 }
680
681
682 outb(info->FCR, info->ioaddr + UART_FCR);
683 outb(cval, info->ioaddr + UART_LCR);
684}
685
686static u8 mxser_check_modem_status(struct tty_struct *tty,
687 struct mxser_port *port)
688{
689 u8 msr = inb(port->ioaddr + UART_MSR);
690
691 if (!(msr & UART_MSR_ANY_DELTA))
692 return msr;
693
694 /* update input line counters */
695 if (msr & UART_MSR_TERI)
696 port->icount.rng++;
697 if (msr & UART_MSR_DDSR)
698 port->icount.dsr++;
699 if (msr & UART_MSR_DDCD)
700 port->icount.dcd++;
701 if (msr & UART_MSR_DCTS)
702 port->icount.cts++;
703 wake_up_interruptible(&port->port.delta_msr_wait);
704
705 if (tty_port_check_carrier(&port->port) && (msr & UART_MSR_DDCD)) {
706 if (msr & UART_MSR_DCD)
707 wake_up_interruptible(&port->port.open_wait);
708 }
709
710 if (tty_port_cts_enabled(&port->port))
711 mxser_handle_cts(tty, port, msr);
712
713 return msr;
714}
715
716static void mxser_disable_and_clear_FIFO(struct mxser_port *info)
717{
718 u8 fcr = UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT;
719
720 if (info->board->must_hwid)
721 fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
722
723 outb(fcr, info->ioaddr + UART_FCR);
724}
725
726static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
727{
728 struct mxser_port *info = container_of(port, struct mxser_port, port);
729 unsigned long flags;
730 int ret;
731
732 ret = tty_port_alloc_xmit_buf(port);
733 if (ret < 0)
734 return ret;
735
736 spin_lock_irqsave(&info->slock, flags);
737
738 if (!info->type) {
739 set_bit(TTY_IO_ERROR, &tty->flags);
740 spin_unlock_irqrestore(&info->slock, flags);
741 ret = 0;
742 goto err_free_xmit;
743 }
744
745 /*
746 * Clear the FIFO buffers and disable them
747 * (they will be reenabled in mxser_change_speed())
748 */
749 mxser_disable_and_clear_FIFO(info);
750
751 /*
752 * At this point there's no way the LSR could still be 0xFF;
753 * if it is, then bail out, because there's likely no UART
754 * here.
755 */
756 if (inb(info->ioaddr + UART_LSR) == 0xff) {
757 spin_unlock_irqrestore(&info->slock, flags);
758 if (capable(CAP_SYS_ADMIN)) {
759 set_bit(TTY_IO_ERROR, &tty->flags);
760 return 0;
761 }
762
763 ret = -ENODEV;
764 goto err_free_xmit;
765 }
766
767 /*
768 * Clear the interrupt registers.
769 */
770 (void) inb(info->ioaddr + UART_LSR);
771 (void) inb(info->ioaddr + UART_RX);
772 (void) inb(info->ioaddr + UART_IIR);
773 (void) inb(info->ioaddr + UART_MSR);
774
775 /*
776 * Now, initialize the UART
777 */
778 outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR); /* reset DLAB */
779 info->MCR = UART_MCR_DTR | UART_MCR_RTS;
780 outb(info->MCR, info->ioaddr + UART_MCR);
781
782 /*
783 * Finally, enable interrupts
784 */
785 info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
786
787 if (info->board->must_hwid)
788 info->IER |= MOXA_MUST_IER_EGDAI;
789 outb(info->IER, info->ioaddr + UART_IER); /* enable interrupts */
790
791 /*
792 * And clear the interrupt registers again for luck.
793 */
794 (void) inb(info->ioaddr + UART_LSR);
795 (void) inb(info->ioaddr + UART_RX);
796 (void) inb(info->ioaddr + UART_IIR);
797 (void) inb(info->ioaddr + UART_MSR);
798
799 clear_bit(TTY_IO_ERROR, &tty->flags);
800 kfifo_reset(&port->xmit_fifo);
801
802 /*
803 * and set the speed of the serial port
804 */
805 mxser_change_speed(tty, NULL);
806 spin_unlock_irqrestore(&info->slock, flags);
807
808 return 0;
809err_free_xmit:
810 tty_port_free_xmit_buf(port);
811 return ret;
812}
813
814/*
815 * To stop accepting input, we disable the receive line status interrupts, and
816 * tell the interrupt driver to stop checking the data ready bit in the line
817 * status register.
818 */
819static void mxser_stop_rx(struct mxser_port *info)
820{
821 info->IER &= ~UART_IER_RLSI;
822 if (info->board->must_hwid)
823 info->IER &= ~MOXA_MUST_RECV_ISR;
824
825 outb(info->IER, info->ioaddr + UART_IER);
826}
827
828/*
829 * This routine will shutdown a serial port
830 */
831static void mxser_shutdown_port(struct tty_port *port)
832{
833 struct mxser_port *info = container_of(port, struct mxser_port, port);
834 unsigned long flags;
835
836 spin_lock_irqsave(&info->slock, flags);
837
838 mxser_stop_rx(info);
839
840 /*
841 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
842 * here so the queue might never be waken up
843 */
844 wake_up_interruptible(&info->port.delta_msr_wait);
845
846 info->IER = 0;
847 outb(0x00, info->ioaddr + UART_IER);
848
849 /* clear Rx/Tx FIFO's */
850 mxser_disable_and_clear_FIFO(info);
851
852 /* read data port to reset things */
853 (void) inb(info->ioaddr + UART_RX);
854
855
856 if (info->board->must_hwid)
857 mxser_must_no_sw_flow_control(info->ioaddr);
858
859 spin_unlock_irqrestore(&info->slock, flags);
860
861 /* make sure ISR is not running while we free the buffer */
862 synchronize_irq(info->board->irq);
863
864 tty_port_free_xmit_buf(port);
865}
866
867/*
868 * This routine is called whenever a serial port is opened. It
869 * enables interrupts for a serial port, linking in its async structure into
870 * the IRQ chain. It also performs the serial-specific
871 * initialization for the tty structure.
872 */
873static int mxser_open(struct tty_struct *tty, struct file *filp)
874{
875 struct tty_port *tport = tty->port;
876 struct mxser_port *port = container_of(tport, struct mxser_port, port);
877
878 tty->driver_data = port;
879
880 return tty_port_open(tport, tty, filp);
881}
882
883static void mxser_flush_buffer(struct tty_struct *tty)
884{
885 struct mxser_port *info = tty->driver_data;
886 unsigned long flags;
887
888 spin_lock_irqsave(&info->slock, flags);
889 kfifo_reset(&info->port.xmit_fifo);
890
891 outb(info->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
892 info->ioaddr + UART_FCR);
893
894 spin_unlock_irqrestore(&info->slock, flags);
895
896 tty_wakeup(tty);
897}
898
899static void mxser_close(struct tty_struct *tty, struct file *filp)
900{
901 tty_port_close(tty->port, tty, filp);
902}
903
904static ssize_t mxser_write(struct tty_struct *tty, const u8 *buf, size_t count)
905{
906 struct mxser_port *info = tty->driver_data;
907 unsigned long flags;
908 size_t written;
909 bool is_empty;
910
911 spin_lock_irqsave(&info->slock, flags);
912 written = kfifo_in(&info->port.xmit_fifo, buf, count);
913 is_empty = kfifo_is_empty(&info->port.xmit_fifo);
914 spin_unlock_irqrestore(&info->slock, flags);
915
916 if (!is_empty && !tty->flow.stopped)
917 if (!tty->hw_stopped || mxser_16550A_or_MUST(info))
918 mxser_start_tx(info);
919
920 return written;
921}
922
923static int mxser_put_char(struct tty_struct *tty, u8 ch)
924{
925 struct mxser_port *info = tty->driver_data;
926 unsigned long flags;
927 int ret;
928
929 spin_lock_irqsave(&info->slock, flags);
930 ret = kfifo_put(&info->port.xmit_fifo, ch);
931 spin_unlock_irqrestore(&info->slock, flags);
932
933 return ret;
934}
935
936
937static void mxser_flush_chars(struct tty_struct *tty)
938{
939 struct mxser_port *info = tty->driver_data;
940
941 if (kfifo_is_empty(&info->port.xmit_fifo) || tty->flow.stopped ||
942 (tty->hw_stopped && !mxser_16550A_or_MUST(info)))
943 return;
944
945 mxser_start_tx(info);
946}
947
948static unsigned int mxser_write_room(struct tty_struct *tty)
949{
950 struct mxser_port *info = tty->driver_data;
951
952 return kfifo_avail(&info->port.xmit_fifo);
953}
954
955static unsigned int mxser_chars_in_buffer(struct tty_struct *tty)
956{
957 struct mxser_port *info = tty->driver_data;
958
959 return kfifo_len(&info->port.xmit_fifo);
960}
961
962/*
963 * ------------------------------------------------------------
964 * friends of mxser_ioctl()
965 * ------------------------------------------------------------
966 */
967static int mxser_get_serial_info(struct tty_struct *tty,
968 struct serial_struct *ss)
969{
970 struct mxser_port *info = tty->driver_data;
971 struct tty_port *port = &info->port;
972 unsigned int closing_wait, close_delay;
973
974 mutex_lock(&port->mutex);
975
976 close_delay = jiffies_to_msecs(info->port.close_delay) / 10;
977 closing_wait = info->port.closing_wait;
978 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
979 closing_wait = jiffies_to_msecs(closing_wait) / 10;
980
981 ss->type = info->type;
982 ss->line = tty->index;
983 ss->port = info->ioaddr;
984 ss->irq = info->board->irq;
985 ss->flags = info->port.flags;
986 ss->baud_base = MXSER_BAUD_BASE;
987 ss->close_delay = close_delay;
988 ss->closing_wait = closing_wait;
989 ss->custom_divisor = MXSER_CUSTOM_DIVISOR,
990 mutex_unlock(&port->mutex);
991 return 0;
992}
993
994static int mxser_set_serial_info(struct tty_struct *tty,
995 struct serial_struct *ss)
996{
997 struct mxser_port *info = tty->driver_data;
998 struct tty_port *port = &info->port;
999 speed_t baud;
1000 unsigned long sl_flags;
1001 unsigned int old_speed, close_delay, closing_wait;
1002 int retval = 0;
1003
1004 if (tty_io_error(tty))
1005 return -EIO;
1006
1007 mutex_lock(&port->mutex);
1008
1009 if (ss->irq != info->board->irq ||
1010 ss->port != info->ioaddr) {
1011 mutex_unlock(&port->mutex);
1012 return -EINVAL;
1013 }
1014
1015 old_speed = port->flags & ASYNC_SPD_MASK;
1016
1017 close_delay = msecs_to_jiffies(ss->close_delay * 10);
1018 closing_wait = ss->closing_wait;
1019 if (closing_wait != ASYNC_CLOSING_WAIT_NONE)
1020 closing_wait = msecs_to_jiffies(closing_wait * 10);
1021
1022 if (!capable(CAP_SYS_ADMIN)) {
1023 if ((ss->baud_base != MXSER_BAUD_BASE) ||
1024 (close_delay != port->close_delay) ||
1025 (closing_wait != port->closing_wait) ||
1026 ((ss->flags & ~ASYNC_USR_MASK) != (port->flags & ~ASYNC_USR_MASK))) {
1027 mutex_unlock(&port->mutex);
1028 return -EPERM;
1029 }
1030 port->flags = (port->flags & ~ASYNC_USR_MASK) |
1031 (ss->flags & ASYNC_USR_MASK);
1032 } else {
1033 /*
1034 * OK, past this point, all the error checking has been done.
1035 * At this point, we start making changes.....
1036 */
1037 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1038 (ss->flags & ASYNC_FLAGS));
1039 port->close_delay = close_delay;
1040 port->closing_wait = closing_wait;
1041 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1042 (ss->baud_base != MXSER_BAUD_BASE ||
1043 ss->custom_divisor !=
1044 MXSER_CUSTOM_DIVISOR)) {
1045 if (ss->custom_divisor == 0) {
1046 mutex_unlock(&port->mutex);
1047 return -EINVAL;
1048 }
1049 baud = ss->baud_base / ss->custom_divisor;
1050 tty_encode_baud_rate(tty, baud, baud);
1051 }
1052
1053 info->type = ss->type;
1054
1055 mxser_process_txrx_fifo(info);
1056 }
1057
1058 if (tty_port_initialized(port)) {
1059 if (old_speed != (port->flags & ASYNC_SPD_MASK)) {
1060 spin_lock_irqsave(&info->slock, sl_flags);
1061 mxser_change_speed(tty, NULL);
1062 spin_unlock_irqrestore(&info->slock, sl_flags);
1063 }
1064 } else {
1065 retval = mxser_activate(port, tty);
1066 if (retval == 0)
1067 tty_port_set_initialized(port, true);
1068 }
1069 mutex_unlock(&port->mutex);
1070 return retval;
1071}
1072
1073/*
1074 * mxser_get_lsr_info - get line status register info
1075 *
1076 * Purpose: Let user call ioctl() to get info when the UART physically
1077 * is emptied. On bus types like RS485, the transmitter must
1078 * release the bus after transmitting. This must be done when
1079 * the transmit shift register is empty, not be done when the
1080 * transmit holding register is empty. This functionality
1081 * allows an RS485 driver to be written in user space.
1082 */
1083static int mxser_get_lsr_info(struct mxser_port *info,
1084 unsigned int __user *value)
1085{
1086 unsigned char status;
1087 unsigned int result;
1088 unsigned long flags;
1089
1090 spin_lock_irqsave(&info->slock, flags);
1091 status = inb(info->ioaddr + UART_LSR);
1092 spin_unlock_irqrestore(&info->slock, flags);
1093 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1094 return put_user(result, value);
1095}
1096
1097static int mxser_tiocmget(struct tty_struct *tty)
1098{
1099 struct mxser_port *info = tty->driver_data;
1100 unsigned char control;
1101 unsigned long flags;
1102 u8 msr;
1103
1104 if (tty_io_error(tty))
1105 return -EIO;
1106
1107 spin_lock_irqsave(&info->slock, flags);
1108 control = info->MCR;
1109 msr = mxser_check_modem_status(tty, info);
1110 spin_unlock_irqrestore(&info->slock, flags);
1111
1112 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1113 ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1114 ((msr & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1115 ((msr & UART_MSR_RI) ? TIOCM_RNG : 0) |
1116 ((msr & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1117 ((msr & UART_MSR_CTS) ? TIOCM_CTS : 0);
1118}
1119
1120static int mxser_tiocmset(struct tty_struct *tty,
1121 unsigned int set, unsigned int clear)
1122{
1123 struct mxser_port *info = tty->driver_data;
1124 unsigned long flags;
1125
1126 if (tty_io_error(tty))
1127 return -EIO;
1128
1129 spin_lock_irqsave(&info->slock, flags);
1130
1131 if (set & TIOCM_RTS)
1132 info->MCR |= UART_MCR_RTS;
1133 if (set & TIOCM_DTR)
1134 info->MCR |= UART_MCR_DTR;
1135
1136 if (clear & TIOCM_RTS)
1137 info->MCR &= ~UART_MCR_RTS;
1138 if (clear & TIOCM_DTR)
1139 info->MCR &= ~UART_MCR_DTR;
1140
1141 outb(info->MCR, info->ioaddr + UART_MCR);
1142 spin_unlock_irqrestore(&info->slock, flags);
1143 return 0;
1144}
1145
1146static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1147 struct async_icount *cprev)
1148{
1149 struct async_icount cnow;
1150 unsigned long flags;
1151 int ret;
1152
1153 spin_lock_irqsave(&info->slock, flags);
1154 cnow = info->icount; /* atomic copy */
1155 spin_unlock_irqrestore(&info->slock, flags);
1156
1157 ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1158 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1159 ((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1160 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1161
1162 *cprev = cnow;
1163
1164 return ret;
1165}
1166
1167/* We should likely switch to TIOCGRS485/TIOCSRS485. */
1168static int mxser_ioctl_op_mode(struct mxser_port *port, int index, bool set,
1169 int __user *u_opmode)
1170{
1171 int opmode, p = index % 4;
1172 int shiftbit = p * 2;
1173 u8 val;
1174
1175 if (port->board->must_hwid != MOXA_MUST_MU860_HWID)
1176 return -EFAULT;
1177
1178 if (set) {
1179 if (get_user(opmode, u_opmode))
1180 return -EFAULT;
1181
1182 if (opmode & ~OP_MODE_MASK)
1183 return -EINVAL;
1184
1185 spin_lock_irq(&port->slock);
1186 val = inb(port->opmode_ioaddr);
1187 val &= ~(OP_MODE_MASK << shiftbit);
1188 val |= (opmode << shiftbit);
1189 outb(val, port->opmode_ioaddr);
1190 spin_unlock_irq(&port->slock);
1191
1192 return 0;
1193 }
1194
1195 spin_lock_irq(&port->slock);
1196 opmode = inb(port->opmode_ioaddr) >> shiftbit;
1197 spin_unlock_irq(&port->slock);
1198
1199 return put_user(opmode & OP_MODE_MASK, u_opmode);
1200}
1201
1202static int mxser_ioctl(struct tty_struct *tty,
1203 unsigned int cmd, unsigned long arg)
1204{
1205 struct mxser_port *info = tty->driver_data;
1206 struct async_icount cnow;
1207 unsigned long flags;
1208 void __user *argp = (void __user *)arg;
1209
1210 if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE)
1211 return mxser_ioctl_op_mode(info, tty->index,
1212 cmd == MOXA_SET_OP_MODE, argp);
1213
1214 if (cmd != TIOCMIWAIT && tty_io_error(tty))
1215 return -EIO;
1216
1217 switch (cmd) {
1218 case TIOCSERGETLSR: /* Get line status register */
1219 return mxser_get_lsr_info(info, argp);
1220 /*
1221 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1222 * - mask passed in arg for lines of interest
1223 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1224 * Caller should use TIOCGICOUNT to see which one it was
1225 */
1226 case TIOCMIWAIT:
1227 spin_lock_irqsave(&info->slock, flags);
1228 cnow = info->icount; /* note the counters on entry */
1229 spin_unlock_irqrestore(&info->slock, flags);
1230
1231 return wait_event_interruptible(info->port.delta_msr_wait,
1232 mxser_cflags_changed(info, arg, &cnow));
1233 default:
1234 return -ENOIOCTLCMD;
1235 }
1236 return 0;
1237}
1238
1239 /*
1240 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1241 * Return: write counters to the user passed counter struct
1242 * NB: both 1->0 and 0->1 transitions are counted except for
1243 * RI where only 0->1 is counted.
1244 */
1245
1246static int mxser_get_icount(struct tty_struct *tty,
1247 struct serial_icounter_struct *icount)
1248
1249{
1250 struct mxser_port *info = tty->driver_data;
1251 struct async_icount cnow;
1252 unsigned long flags;
1253
1254 spin_lock_irqsave(&info->slock, flags);
1255 cnow = info->icount;
1256 spin_unlock_irqrestore(&info->slock, flags);
1257
1258 icount->frame = cnow.frame;
1259 icount->brk = cnow.brk;
1260 icount->overrun = cnow.overrun;
1261 icount->buf_overrun = cnow.buf_overrun;
1262 icount->parity = cnow.parity;
1263 icount->rx = cnow.rx;
1264 icount->tx = cnow.tx;
1265 icount->cts = cnow.cts;
1266 icount->dsr = cnow.dsr;
1267 icount->rng = cnow.rng;
1268 icount->dcd = cnow.dcd;
1269 return 0;
1270}
1271
1272/*
1273 * This routine is called by the upper-layer tty layer to signal that
1274 * incoming characters should be throttled.
1275 */
1276static void mxser_throttle(struct tty_struct *tty)
1277{
1278 struct mxser_port *info = tty->driver_data;
1279
1280 if (I_IXOFF(tty)) {
1281 if (info->board->must_hwid) {
1282 info->IER &= ~MOXA_MUST_RECV_ISR;
1283 outb(info->IER, info->ioaddr + UART_IER);
1284 } else {
1285 info->x_char = STOP_CHAR(tty);
1286 outb(0, info->ioaddr + UART_IER);
1287 info->IER |= UART_IER_THRI;
1288 outb(info->IER, info->ioaddr + UART_IER);
1289 }
1290 }
1291
1292 if (C_CRTSCTS(tty)) {
1293 info->MCR &= ~UART_MCR_RTS;
1294 outb(info->MCR, info->ioaddr + UART_MCR);
1295 }
1296}
1297
1298static void mxser_unthrottle(struct tty_struct *tty)
1299{
1300 struct mxser_port *info = tty->driver_data;
1301
1302 /* startrx */
1303 if (I_IXOFF(tty)) {
1304 if (info->x_char)
1305 info->x_char = 0;
1306 else {
1307 if (info->board->must_hwid) {
1308 info->IER |= MOXA_MUST_RECV_ISR;
1309 outb(info->IER, info->ioaddr + UART_IER);
1310 } else {
1311 info->x_char = START_CHAR(tty);
1312 outb(0, info->ioaddr + UART_IER);
1313 info->IER |= UART_IER_THRI;
1314 outb(info->IER, info->ioaddr + UART_IER);
1315 }
1316 }
1317 }
1318
1319 if (C_CRTSCTS(tty)) {
1320 info->MCR |= UART_MCR_RTS;
1321 outb(info->MCR, info->ioaddr + UART_MCR);
1322 }
1323}
1324
1325/*
1326 * mxser_stop() and mxser_start()
1327 *
1328 * This routines are called before setting or resetting tty->flow.stopped.
1329 * They enable or disable transmitter interrupts, as necessary.
1330 */
1331static void mxser_stop(struct tty_struct *tty)
1332{
1333 struct mxser_port *info = tty->driver_data;
1334 unsigned long flags;
1335
1336 spin_lock_irqsave(&info->slock, flags);
1337 if (info->IER & UART_IER_THRI)
1338 __mxser_stop_tx(info);
1339 spin_unlock_irqrestore(&info->slock, flags);
1340}
1341
1342static void mxser_start(struct tty_struct *tty)
1343{
1344 struct mxser_port *info = tty->driver_data;
1345 unsigned long flags;
1346
1347 spin_lock_irqsave(&info->slock, flags);
1348 if (!kfifo_is_empty(&info->port.xmit_fifo))
1349 __mxser_start_tx(info);
1350 spin_unlock_irqrestore(&info->slock, flags);
1351}
1352
1353static void mxser_set_termios(struct tty_struct *tty,
1354 const struct ktermios *old_termios)
1355{
1356 struct mxser_port *info = tty->driver_data;
1357 unsigned long flags;
1358
1359 spin_lock_irqsave(&info->slock, flags);
1360 mxser_change_speed(tty, old_termios);
1361 spin_unlock_irqrestore(&info->slock, flags);
1362
1363 if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1364 tty->hw_stopped = false;
1365 mxser_start(tty);
1366 }
1367
1368 /* Handle sw stopped */
1369 if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1370 tty->flow.stopped = 0;
1371
1372 if (info->board->must_hwid) {
1373 spin_lock_irqsave(&info->slock, flags);
1374 mxser_must_set_rx_sw_flow_control(info->ioaddr, false);
1375 spin_unlock_irqrestore(&info->slock, flags);
1376 }
1377
1378 mxser_start(tty);
1379 }
1380}
1381
1382static bool mxser_tx_empty(struct mxser_port *info)
1383{
1384 unsigned long flags;
1385 u8 lsr;
1386
1387 spin_lock_irqsave(&info->slock, flags);
1388 lsr = inb(info->ioaddr + UART_LSR);
1389 spin_unlock_irqrestore(&info->slock, flags);
1390
1391 return !(lsr & UART_LSR_TEMT);
1392}
1393
1394/*
1395 * mxser_wait_until_sent() --- wait until the transmitter is empty
1396 */
1397static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1398{
1399 struct mxser_port *info = tty->driver_data;
1400 unsigned long expire, char_time;
1401
1402 if (info->type == PORT_UNKNOWN)
1403 return;
1404
1405 if (info->xmit_fifo_size == 0)
1406 return; /* Just in case.... */
1407
1408 /*
1409 * Set the check interval to be 1/5 of the estimated time to
1410 * send a single character, and make it at least 1. The check
1411 * interval should also be less than the timeout.
1412 *
1413 * Note: we have to use pretty tight timings here to satisfy
1414 * the NIST-PCTS.
1415 */
1416 char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1417 char_time = char_time / 5;
1418 if (char_time == 0)
1419 char_time = 1;
1420 if (timeout && timeout < char_time)
1421 char_time = timeout;
1422
1423 char_time = jiffies_to_msecs(char_time);
1424
1425 /*
1426 * If the transmitter hasn't cleared in twice the approximate
1427 * amount of time to send the entire FIFO, it probably won't
1428 * ever clear. This assumes the UART isn't doing flow
1429 * control, which is currently the case. Hence, if it ever
1430 * takes longer than info->timeout, this is probably due to a
1431 * UART bug of some kind. So, we clamp the timeout parameter at
1432 * 2*info->timeout.
1433 */
1434 if (!timeout || timeout > 2 * info->timeout)
1435 timeout = 2 * info->timeout;
1436
1437 expire = jiffies + timeout;
1438
1439 while (mxser_tx_empty(info)) {
1440 msleep_interruptible(char_time);
1441 if (signal_pending(current))
1442 break;
1443 if (time_after(jiffies, expire))
1444 break;
1445 }
1446}
1447
1448/*
1449 * This routine is called by tty_hangup() when a hangup is signaled.
1450 */
1451static void mxser_hangup(struct tty_struct *tty)
1452{
1453 struct mxser_port *info = tty->driver_data;
1454
1455 mxser_flush_buffer(tty);
1456 tty_port_hangup(&info->port);
1457}
1458
1459/*
1460 * mxser_rs_break() --- routine which turns the break handling on or off
1461 */
1462static int mxser_rs_break(struct tty_struct *tty, int break_state)
1463{
1464 struct mxser_port *info = tty->driver_data;
1465 unsigned long flags;
1466 u8 lcr;
1467
1468 spin_lock_irqsave(&info->slock, flags);
1469 lcr = inb(info->ioaddr + UART_LCR);
1470 if (break_state == -1)
1471 lcr |= UART_LCR_SBC;
1472 else
1473 lcr &= ~UART_LCR_SBC;
1474 outb(lcr, info->ioaddr + UART_LCR);
1475 spin_unlock_irqrestore(&info->slock, flags);
1476
1477 return 0;
1478}
1479
1480static bool mxser_receive_chars_new(struct mxser_port *port, u8 status)
1481{
1482 enum mxser_must_hwid hwid = port->board->must_hwid;
1483 u8 gdl;
1484
1485 if (hwid == MOXA_OTHER_UART)
1486 return false;
1487 if (status & (UART_LSR_BRK_ERROR_BITS | MOXA_MUST_LSR_RERR))
1488 return false;
1489
1490 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
1491 if (hwid == MOXA_MUST_MU150_HWID)
1492 gdl &= MOXA_MUST_GDL_MASK;
1493
1494 while (gdl--) {
1495 u8 ch = inb(port->ioaddr + UART_RX);
1496 if (!tty_insert_flip_char(&port->port, ch, 0))
1497 port->icount.buf_overrun++;
1498 }
1499
1500 return true;
1501}
1502
1503static u8 mxser_receive_chars_old(struct tty_struct *tty,
1504 struct mxser_port *port, u8 status)
1505{
1506 enum mxser_must_hwid hwid = port->board->must_hwid;
1507 int ignored = 0;
1508 int max = 256;
1509 u8 ch;
1510
1511 do {
1512 if (max-- < 0)
1513 break;
1514
1515 ch = inb(port->ioaddr + UART_RX);
1516 if (hwid && (status & UART_LSR_OE))
1517 outb(port->FCR | UART_FCR_CLEAR_RCVR,
1518 port->ioaddr + UART_FCR);
1519 status &= port->read_status_mask;
1520 if (status & port->ignore_status_mask) {
1521 if (++ignored > 100)
1522 break;
1523 } else {
1524 u8 flag = 0;
1525 if (status & UART_LSR_BRK_ERROR_BITS) {
1526 if (status & UART_LSR_BI) {
1527 flag = TTY_BREAK;
1528 port->icount.brk++;
1529
1530 if (port->port.flags & ASYNC_SAK)
1531 do_SAK(tty);
1532 } else if (status & UART_LSR_PE) {
1533 flag = TTY_PARITY;
1534 port->icount.parity++;
1535 } else if (status & UART_LSR_FE) {
1536 flag = TTY_FRAME;
1537 port->icount.frame++;
1538 } else if (status & UART_LSR_OE) {
1539 flag = TTY_OVERRUN;
1540 port->icount.overrun++;
1541 }
1542 }
1543 if (!tty_insert_flip_char(&port->port, ch, flag)) {
1544 port->icount.buf_overrun++;
1545 break;
1546 }
1547 }
1548
1549 if (hwid)
1550 break;
1551
1552 status = inb(port->ioaddr + UART_LSR);
1553 } while (status & UART_LSR_DR);
1554
1555 return status;
1556}
1557
1558static u8 mxser_receive_chars(struct tty_struct *tty,
1559 struct mxser_port *port, u8 status)
1560{
1561 if (!mxser_receive_chars_new(port, status))
1562 status = mxser_receive_chars_old(tty, port, status);
1563
1564 tty_flip_buffer_push(&port->port);
1565
1566 return status;
1567}
1568
1569static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
1570{
1571 int count;
1572
1573 if (port->x_char) {
1574 outb(port->x_char, port->ioaddr + UART_TX);
1575 port->x_char = 0;
1576 port->icount.tx++;
1577 return;
1578 }
1579
1580 if (kfifo_is_empty(&port->port.xmit_fifo) || tty->flow.stopped ||
1581 (tty->hw_stopped && !mxser_16550A_or_MUST(port))) {
1582 __mxser_stop_tx(port);
1583 return;
1584 }
1585
1586 count = port->xmit_fifo_size;
1587 do {
1588 u8 c;
1589
1590 if (!kfifo_get(&port->port.xmit_fifo, &c))
1591 break;
1592
1593 outb(c, port->ioaddr + UART_TX);
1594 port->icount.tx++;
1595 } while (--count > 0);
1596
1597 if (kfifo_len(&port->port.xmit_fifo) < WAKEUP_CHARS)
1598 tty_wakeup(tty);
1599
1600 if (kfifo_is_empty(&port->port.xmit_fifo))
1601 __mxser_stop_tx(port);
1602}
1603
1604static bool mxser_port_isr(struct mxser_port *port)
1605{
1606 struct tty_struct *tty;
1607 u8 iir, status;
1608 bool error = false;
1609
1610 iir = inb(port->ioaddr + UART_IIR);
1611 if (iir & UART_IIR_NO_INT)
1612 return true;
1613
1614 iir &= MOXA_MUST_IIR_MASK;
1615 tty = tty_port_tty_get(&port->port);
1616 if (!tty) {
1617 status = inb(port->ioaddr + UART_LSR);
1618 outb(port->FCR | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
1619 port->ioaddr + UART_FCR);
1620 inb(port->ioaddr + UART_MSR);
1621
1622 error = true;
1623 goto put_tty;
1624 }
1625
1626 status = inb(port->ioaddr + UART_LSR);
1627
1628 if (port->board->must_hwid) {
1629 if (iir == MOXA_MUST_IIR_GDA ||
1630 iir == MOXA_MUST_IIR_RDA ||
1631 iir == MOXA_MUST_IIR_RTO ||
1632 iir == MOXA_MUST_IIR_LSR)
1633 status = mxser_receive_chars(tty, port, status);
1634 } else {
1635 status &= port->read_status_mask;
1636 if (status & UART_LSR_DR)
1637 status = mxser_receive_chars(tty, port, status);
1638 }
1639
1640 mxser_check_modem_status(tty, port);
1641
1642 if (port->board->must_hwid) {
1643 if (iir == 0x02 && (status & UART_LSR_THRE))
1644 mxser_transmit_chars(tty, port);
1645 } else {
1646 if (status & UART_LSR_THRE)
1647 mxser_transmit_chars(tty, port);
1648 }
1649
1650put_tty:
1651 tty_kref_put(tty);
1652
1653 return error;
1654}
1655
1656/*
1657 * This is the serial driver's generic interrupt routine
1658 */
1659static irqreturn_t mxser_interrupt(int irq, void *dev_id)
1660{
1661 struct mxser_board *brd = dev_id;
1662 struct mxser_port *port;
1663 unsigned int int_cnt, pass_counter = 0;
1664 unsigned int i, max = brd->nports;
1665 int handled = IRQ_NONE;
1666 u8 irqbits, bits, mask = BIT(max) - 1;
1667
1668 while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
1669 irqbits = inb(brd->vector) & mask;
1670 if (irqbits == mask)
1671 break;
1672
1673 handled = IRQ_HANDLED;
1674 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
1675 if (irqbits == mask)
1676 break;
1677 if (bits & irqbits)
1678 continue;
1679 port = &brd->ports[i];
1680
1681 int_cnt = 0;
1682 spin_lock(&port->slock);
1683 do {
1684 if (mxser_port_isr(port))
1685 break;
1686 } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
1687 spin_unlock(&port->slock);
1688 }
1689 }
1690
1691 return handled;
1692}
1693
1694static const struct tty_operations mxser_ops = {
1695 .open = mxser_open,
1696 .close = mxser_close,
1697 .write = mxser_write,
1698 .put_char = mxser_put_char,
1699 .flush_chars = mxser_flush_chars,
1700 .write_room = mxser_write_room,
1701 .chars_in_buffer = mxser_chars_in_buffer,
1702 .flush_buffer = mxser_flush_buffer,
1703 .ioctl = mxser_ioctl,
1704 .throttle = mxser_throttle,
1705 .unthrottle = mxser_unthrottle,
1706 .set_termios = mxser_set_termios,
1707 .stop = mxser_stop,
1708 .start = mxser_start,
1709 .hangup = mxser_hangup,
1710 .break_ctl = mxser_rs_break,
1711 .wait_until_sent = mxser_wait_until_sent,
1712 .tiocmget = mxser_tiocmget,
1713 .tiocmset = mxser_tiocmset,
1714 .set_serial = mxser_set_serial_info,
1715 .get_serial = mxser_get_serial_info,
1716 .get_icount = mxser_get_icount,
1717};
1718
1719static const struct tty_port_operations mxser_port_ops = {
1720 .carrier_raised = mxser_carrier_raised,
1721 .dtr_rts = mxser_dtr_rts,
1722 .activate = mxser_activate,
1723 .shutdown = mxser_shutdown_port,
1724};
1725
1726/*
1727 * The MOXA Smartio/Industio serial driver boot-time initialization code!
1728 */
1729
1730static void mxser_initbrd(struct mxser_board *brd, bool high_baud)
1731{
1732 struct mxser_port *info;
1733 unsigned int i;
1734 bool is_mu860;
1735
1736 brd->must_hwid = mxser_must_get_hwid(brd->ports[0].ioaddr);
1737 is_mu860 = brd->must_hwid == MOXA_MUST_MU860_HWID;
1738
1739 for (i = 0; i < UART_INFO_NUM; i++) {
1740 if (Gpci_uart_info[i].type == brd->must_hwid) {
1741 brd->max_baud = Gpci_uart_info[i].max_baud;
1742
1743 /* exception....CP-102 */
1744 if (high_baud)
1745 brd->max_baud = 921600;
1746 break;
1747 }
1748 }
1749
1750 if (is_mu860) {
1751 /* set to RS232 mode by default */
1752 outb(0, brd->vector + 4);
1753 outb(0, brd->vector + 0x0c);
1754 }
1755
1756 for (i = 0; i < brd->nports; i++) {
1757 info = &brd->ports[i];
1758 if (is_mu860) {
1759 if (i < 4)
1760 info->opmode_ioaddr = brd->vector + 4;
1761 else
1762 info->opmode_ioaddr = brd->vector + 0x0c;
1763 }
1764 tty_port_init(&info->port);
1765 info->port.ops = &mxser_port_ops;
1766 info->board = brd;
1767
1768 /* Enhance mode enabled here */
1769 if (brd->must_hwid != MOXA_OTHER_UART)
1770 mxser_must_set_enhance_mode(info->ioaddr, true);
1771
1772 info->type = PORT_16550A;
1773
1774 mxser_process_txrx_fifo(info);
1775
1776 info->port.close_delay = 5 * HZ / 10;
1777 info->port.closing_wait = 30 * HZ;
1778 spin_lock_init(&info->slock);
1779
1780 /* before set INT ISR, disable all int */
1781 outb(inb(info->ioaddr + UART_IER) & 0xf0,
1782 info->ioaddr + UART_IER);
1783 }
1784}
1785
1786static int mxser_probe(struct pci_dev *pdev,
1787 const struct pci_device_id *ent)
1788{
1789 struct mxser_board *brd;
1790 unsigned int i, base;
1791 unsigned long ioaddress;
1792 unsigned short nports = MXSER_NPORTS(ent->driver_data);
1793 struct device *tty_dev;
1794 int retval = -EINVAL;
1795
1796 i = find_first_zero_bit(mxser_boards, MXSER_BOARDS);
1797 if (i >= MXSER_BOARDS) {
1798 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
1799 "not configured\n", MXSER_BOARDS);
1800 goto err;
1801 }
1802
1803 brd = devm_kzalloc(&pdev->dev, struct_size(brd, ports, nports),
1804 GFP_KERNEL);
1805 if (!brd)
1806 goto err;
1807
1808 brd->idx = i;
1809 __set_bit(brd->idx, mxser_boards);
1810 base = i * MXSER_PORTS_PER_BOARD;
1811
1812 retval = pcim_enable_device(pdev);
1813 if (retval) {
1814 dev_err(&pdev->dev, "PCI enable failed\n");
1815 goto err_zero;
1816 }
1817
1818 /* io address */
1819 ioaddress = pci_resource_start(pdev, 2);
1820 retval = pci_request_region(pdev, 2, "mxser(IO)");
1821 if (retval)
1822 goto err_zero;
1823
1824 brd->nports = nports;
1825 for (i = 0; i < nports; i++)
1826 brd->ports[i].ioaddr = ioaddress + 8 * i;
1827
1828 /* vector */
1829 ioaddress = pci_resource_start(pdev, 3);
1830 retval = pci_request_region(pdev, 3, "mxser(vector)");
1831 if (retval)
1832 goto err_zero;
1833 brd->vector = ioaddress;
1834
1835 /* irq */
1836 brd->irq = pdev->irq;
1837
1838 mxser_initbrd(brd, ent->driver_data & MXSER_HIGHBAUD);
1839
1840 retval = devm_request_irq(&pdev->dev, brd->irq, mxser_interrupt,
1841 IRQF_SHARED, "mxser", brd);
1842 if (retval) {
1843 dev_err(&pdev->dev, "request irq failed");
1844 goto err_relbrd;
1845 }
1846
1847 for (i = 0; i < nports; i++) {
1848 tty_dev = tty_port_register_device(&brd->ports[i].port,
1849 mxvar_sdriver, base + i, &pdev->dev);
1850 if (IS_ERR(tty_dev)) {
1851 retval = PTR_ERR(tty_dev);
1852 for (; i > 0; i--)
1853 tty_unregister_device(mxvar_sdriver,
1854 base + i - 1);
1855 goto err_relbrd;
1856 }
1857 }
1858
1859 pci_set_drvdata(pdev, brd);
1860
1861 return 0;
1862err_relbrd:
1863 for (i = 0; i < nports; i++)
1864 tty_port_destroy(&brd->ports[i].port);
1865err_zero:
1866 __clear_bit(brd->idx, mxser_boards);
1867err:
1868 return retval;
1869}
1870
1871static void mxser_remove(struct pci_dev *pdev)
1872{
1873 struct mxser_board *brd = pci_get_drvdata(pdev);
1874 unsigned int i, base = brd->idx * MXSER_PORTS_PER_BOARD;
1875
1876 for (i = 0; i < brd->nports; i++) {
1877 tty_unregister_device(mxvar_sdriver, base + i);
1878 tty_port_destroy(&brd->ports[i].port);
1879 }
1880
1881 __clear_bit(brd->idx, mxser_boards);
1882}
1883
1884static struct pci_driver mxser_driver = {
1885 .name = "mxser",
1886 .id_table = mxser_pcibrds,
1887 .probe = mxser_probe,
1888 .remove = mxser_remove
1889};
1890
1891static int __init mxser_module_init(void)
1892{
1893 int retval;
1894
1895 mxvar_sdriver = tty_alloc_driver(MXSER_PORTS, TTY_DRIVER_REAL_RAW |
1896 TTY_DRIVER_DYNAMIC_DEV);
1897 if (IS_ERR(mxvar_sdriver))
1898 return PTR_ERR(mxvar_sdriver);
1899
1900 /* Initialize the tty_driver structure */
1901 mxvar_sdriver->name = "ttyMI";
1902 mxvar_sdriver->major = ttymajor;
1903 mxvar_sdriver->minor_start = 0;
1904 mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
1905 mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
1906 mxvar_sdriver->init_termios = tty_std_termios;
1907 mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
1908 tty_set_operations(mxvar_sdriver, &mxser_ops);
1909
1910 retval = tty_register_driver(mxvar_sdriver);
1911 if (retval) {
1912 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
1913 "tty driver !\n");
1914 goto err_put;
1915 }
1916
1917 retval = pci_register_driver(&mxser_driver);
1918 if (retval) {
1919 printk(KERN_ERR "mxser: can't register pci driver\n");
1920 goto err_unr;
1921 }
1922
1923 return 0;
1924err_unr:
1925 tty_unregister_driver(mxvar_sdriver);
1926err_put:
1927 tty_driver_kref_put(mxvar_sdriver);
1928 return retval;
1929}
1930
1931static void __exit mxser_module_exit(void)
1932{
1933 pci_unregister_driver(&mxser_driver);
1934 tty_unregister_driver(mxvar_sdriver);
1935 tty_driver_kref_put(mxvar_sdriver);
1936}
1937
1938module_init(mxser_module_init);
1939module_exit(mxser_module_exit);
1/*
2 * mxser.c -- MOXA Smartio/Industio family multiport serial driver.
3 *
4 * Copyright (C) 1999-2006 Moxa Technologies (support@moxa.com).
5 * Copyright (C) 2006-2008 Jiri Slaby <jirislaby@gmail.com>
6 *
7 * This code is loosely based on the 1.8 moxa driver which is based on
8 * Linux serial driver, written by Linus Torvalds, Theodore T'so and
9 * others.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
17 * <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
18 * www.moxa.com.
19 * - Fixed x86_64 cleanness
20 */
21
22#include <linux/module.h>
23#include <linux/errno.h>
24#include <linux/signal.h>
25#include <linux/sched.h>
26#include <linux/timer.h>
27#include <linux/interrupt.h>
28#include <linux/tty.h>
29#include <linux/tty_flip.h>
30#include <linux/serial.h>
31#include <linux/serial_reg.h>
32#include <linux/major.h>
33#include <linux/string.h>
34#include <linux/fcntl.h>
35#include <linux/ptrace.h>
36#include <linux/ioport.h>
37#include <linux/mm.h>
38#include <linux/delay.h>
39#include <linux/pci.h>
40#include <linux/bitops.h>
41#include <linux/slab.h>
42#include <linux/ratelimit.h>
43
44#include <asm/io.h>
45#include <asm/irq.h>
46#include <asm/uaccess.h>
47
48#include "mxser.h"
49
50#define MXSER_VERSION "2.0.5" /* 1.14 */
51#define MXSERMAJOR 174
52
53#define MXSER_BOARDS 4 /* Max. boards */
54#define MXSER_PORTS_PER_BOARD 8 /* Max. ports per board */
55#define MXSER_PORTS (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
56#define MXSER_ISR_PASS_LIMIT 100
57
58/*CheckIsMoxaMust return value*/
59#define MOXA_OTHER_UART 0x00
60#define MOXA_MUST_MU150_HWID 0x01
61#define MOXA_MUST_MU860_HWID 0x02
62
63#define WAKEUP_CHARS 256
64
65#define UART_MCR_AFE 0x20
66#define UART_LSR_SPECIAL 0x1E
67
68#define PCI_DEVICE_ID_POS104UL 0x1044
69#define PCI_DEVICE_ID_CB108 0x1080
70#define PCI_DEVICE_ID_CP102UF 0x1023
71#define PCI_DEVICE_ID_CP112UL 0x1120
72#define PCI_DEVICE_ID_CB114 0x1142
73#define PCI_DEVICE_ID_CP114UL 0x1143
74#define PCI_DEVICE_ID_CB134I 0x1341
75#define PCI_DEVICE_ID_CP138U 0x1380
76
77
78#define C168_ASIC_ID 1
79#define C104_ASIC_ID 2
80#define C102_ASIC_ID 0xB
81#define CI132_ASIC_ID 4
82#define CI134_ASIC_ID 3
83#define CI104J_ASIC_ID 5
84
85#define MXSER_HIGHBAUD 1
86#define MXSER_HAS2 2
87
88/* This is only for PCI */
89static const struct {
90 int type;
91 int tx_fifo;
92 int rx_fifo;
93 int xmit_fifo_size;
94 int rx_high_water;
95 int rx_trigger;
96 int rx_low_water;
97 long max_baud;
98} Gpci_uart_info[] = {
99 {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
100 {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
101 {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
102};
103#define UART_INFO_NUM ARRAY_SIZE(Gpci_uart_info)
104
105struct mxser_cardinfo {
106 char *name;
107 unsigned int nports;
108 unsigned int flags;
109};
110
111static const struct mxser_cardinfo mxser_cards[] = {
112/* 0*/ { "C168 series", 8, },
113 { "C104 series", 4, },
114 { "CI-104J series", 4, },
115 { "C168H/PCI series", 8, },
116 { "C104H/PCI series", 4, },
117/* 5*/ { "C102 series", 4, MXSER_HAS2 }, /* C102-ISA */
118 { "CI-132 series", 4, MXSER_HAS2 },
119 { "CI-134 series", 4, },
120 { "CP-132 series", 2, },
121 { "CP-114 series", 4, },
122/*10*/ { "CT-114 series", 4, },
123 { "CP-102 series", 2, MXSER_HIGHBAUD },
124 { "CP-104U series", 4, },
125 { "CP-168U series", 8, },
126 { "CP-132U series", 2, },
127/*15*/ { "CP-134U series", 4, },
128 { "CP-104JU series", 4, },
129 { "Moxa UC7000 Serial", 8, }, /* RC7000 */
130 { "CP-118U series", 8, },
131 { "CP-102UL series", 2, },
132/*20*/ { "CP-102U series", 2, },
133 { "CP-118EL series", 8, },
134 { "CP-168EL series", 8, },
135 { "CP-104EL series", 4, },
136 { "CB-108 series", 8, },
137/*25*/ { "CB-114 series", 4, },
138 { "CB-134I series", 4, },
139 { "CP-138U series", 8, },
140 { "POS-104UL series", 4, },
141 { "CP-114UL series", 4, },
142/*30*/ { "CP-102UF series", 2, },
143 { "CP-112UL series", 2, },
144};
145
146/* driver_data correspond to the lines in the structure above
147 see also ISA probe function before you change something */
148static struct pci_device_id mxser_pcibrds[] = {
149 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168), .driver_data = 3 },
150 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104), .driver_data = 4 },
151 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132), .driver_data = 8 },
152 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114), .driver_data = 9 },
153 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114), .driver_data = 10 },
154 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102), .driver_data = 11 },
155 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
156 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
157 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
158 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
159 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
160 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
161 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
162 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
163 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
164 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
165 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
166 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
167 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108), .driver_data = 24 },
168 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114), .driver_data = 25 },
169 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I), .driver_data = 26 },
170 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U), .driver_data = 27 },
171 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL), .driver_data = 28 },
172 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL), .driver_data = 29 },
173 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF), .driver_data = 30 },
174 { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL), .driver_data = 31 },
175 { }
176};
177MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
178
179static unsigned long ioaddr[MXSER_BOARDS];
180static int ttymajor = MXSERMAJOR;
181
182/* Variables for insmod */
183
184MODULE_AUTHOR("Casper Yang");
185MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
186module_param_array(ioaddr, ulong, NULL, 0);
187MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
188module_param(ttymajor, int, 0);
189MODULE_LICENSE("GPL");
190
191struct mxser_log {
192 int tick;
193 unsigned long rxcnt[MXSER_PORTS];
194 unsigned long txcnt[MXSER_PORTS];
195};
196
197struct mxser_mon {
198 unsigned long rxcnt;
199 unsigned long txcnt;
200 unsigned long up_rxcnt;
201 unsigned long up_txcnt;
202 int modem_status;
203 unsigned char hold_reason;
204};
205
206struct mxser_mon_ext {
207 unsigned long rx_cnt[32];
208 unsigned long tx_cnt[32];
209 unsigned long up_rxcnt[32];
210 unsigned long up_txcnt[32];
211 int modem_status[32];
212
213 long baudrate[32];
214 int databits[32];
215 int stopbits[32];
216 int parity[32];
217 int flowctrl[32];
218 int fifo[32];
219 int iftype[32];
220};
221
222struct mxser_board;
223
224struct mxser_port {
225 struct tty_port port;
226 struct mxser_board *board;
227
228 unsigned long ioaddr;
229 unsigned long opmode_ioaddr;
230 int max_baud;
231
232 int rx_high_water;
233 int rx_trigger; /* Rx fifo trigger level */
234 int rx_low_water;
235 int baud_base; /* max. speed */
236 int type; /* UART type */
237
238 int x_char; /* xon/xoff character */
239 int IER; /* Interrupt Enable Register */
240 int MCR; /* Modem control register */
241
242 unsigned char stop_rx;
243 unsigned char ldisc_stop_rx;
244
245 int custom_divisor;
246 unsigned char err_shadow;
247
248 struct async_icount icount; /* kernel counters for 4 input interrupts */
249 int timeout;
250
251 int read_status_mask;
252 int ignore_status_mask;
253 int xmit_fifo_size;
254 int xmit_head;
255 int xmit_tail;
256 int xmit_cnt;
257
258 struct ktermios normal_termios;
259
260 struct mxser_mon mon_data;
261
262 spinlock_t slock;
263};
264
265struct mxser_board {
266 unsigned int idx;
267 int irq;
268 const struct mxser_cardinfo *info;
269 unsigned long vector;
270 unsigned long vector_mask;
271
272 int chip_flag;
273 int uart_type;
274
275 struct mxser_port ports[MXSER_PORTS_PER_BOARD];
276};
277
278struct mxser_mstatus {
279 tcflag_t cflag;
280 int cts;
281 int dsr;
282 int ri;
283 int dcd;
284};
285
286static struct mxser_board mxser_boards[MXSER_BOARDS];
287static struct tty_driver *mxvar_sdriver;
288static struct mxser_log mxvar_log;
289static int mxser_set_baud_method[MXSER_PORTS + 1];
290
291static void mxser_enable_must_enchance_mode(unsigned long baseio)
292{
293 u8 oldlcr;
294 u8 efr;
295
296 oldlcr = inb(baseio + UART_LCR);
297 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
298
299 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
300 efr |= MOXA_MUST_EFR_EFRB_ENABLE;
301
302 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
303 outb(oldlcr, baseio + UART_LCR);
304}
305
306#ifdef CONFIG_PCI
307static void mxser_disable_must_enchance_mode(unsigned long baseio)
308{
309 u8 oldlcr;
310 u8 efr;
311
312 oldlcr = inb(baseio + UART_LCR);
313 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
314
315 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
316 efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
317
318 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
319 outb(oldlcr, baseio + UART_LCR);
320}
321#endif
322
323static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
324{
325 u8 oldlcr;
326 u8 efr;
327
328 oldlcr = inb(baseio + UART_LCR);
329 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
330
331 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
332 efr &= ~MOXA_MUST_EFR_BANK_MASK;
333 efr |= MOXA_MUST_EFR_BANK0;
334
335 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
336 outb(value, baseio + MOXA_MUST_XON1_REGISTER);
337 outb(oldlcr, baseio + UART_LCR);
338}
339
340static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
341{
342 u8 oldlcr;
343 u8 efr;
344
345 oldlcr = inb(baseio + UART_LCR);
346 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
347
348 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
349 efr &= ~MOXA_MUST_EFR_BANK_MASK;
350 efr |= MOXA_MUST_EFR_BANK0;
351
352 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
353 outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
354 outb(oldlcr, baseio + UART_LCR);
355}
356
357static void mxser_set_must_fifo_value(struct mxser_port *info)
358{
359 u8 oldlcr;
360 u8 efr;
361
362 oldlcr = inb(info->ioaddr + UART_LCR);
363 outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
364
365 efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
366 efr &= ~MOXA_MUST_EFR_BANK_MASK;
367 efr |= MOXA_MUST_EFR_BANK1;
368
369 outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
370 outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
371 outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
372 outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
373 outb(oldlcr, info->ioaddr + UART_LCR);
374}
375
376static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
377{
378 u8 oldlcr;
379 u8 efr;
380
381 oldlcr = inb(baseio + UART_LCR);
382 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
383
384 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
385 efr &= ~MOXA_MUST_EFR_BANK_MASK;
386 efr |= MOXA_MUST_EFR_BANK2;
387
388 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
389 outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
390 outb(oldlcr, baseio + UART_LCR);
391}
392
393#ifdef CONFIG_PCI
394static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
395{
396 u8 oldlcr;
397 u8 efr;
398
399 oldlcr = inb(baseio + UART_LCR);
400 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
401
402 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
403 efr &= ~MOXA_MUST_EFR_BANK_MASK;
404 efr |= MOXA_MUST_EFR_BANK2;
405
406 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
407 *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
408 outb(oldlcr, baseio + UART_LCR);
409}
410#endif
411
412static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
413{
414 u8 oldlcr;
415 u8 efr;
416
417 oldlcr = inb(baseio + UART_LCR);
418 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
419
420 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
421 efr &= ~MOXA_MUST_EFR_SF_MASK;
422
423 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
424 outb(oldlcr, baseio + UART_LCR);
425}
426
427static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
428{
429 u8 oldlcr;
430 u8 efr;
431
432 oldlcr = inb(baseio + UART_LCR);
433 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
434
435 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
436 efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
437 efr |= MOXA_MUST_EFR_SF_TX1;
438
439 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
440 outb(oldlcr, baseio + UART_LCR);
441}
442
443static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
444{
445 u8 oldlcr;
446 u8 efr;
447
448 oldlcr = inb(baseio + UART_LCR);
449 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
450
451 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
452 efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
453
454 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
455 outb(oldlcr, baseio + UART_LCR);
456}
457
458static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
459{
460 u8 oldlcr;
461 u8 efr;
462
463 oldlcr = inb(baseio + UART_LCR);
464 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
465
466 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
467 efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
468 efr |= MOXA_MUST_EFR_SF_RX1;
469
470 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
471 outb(oldlcr, baseio + UART_LCR);
472}
473
474static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
475{
476 u8 oldlcr;
477 u8 efr;
478
479 oldlcr = inb(baseio + UART_LCR);
480 outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
481
482 efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
483 efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
484
485 outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
486 outb(oldlcr, baseio + UART_LCR);
487}
488
489#ifdef CONFIG_PCI
490static int CheckIsMoxaMust(unsigned long io)
491{
492 u8 oldmcr, hwid;
493 int i;
494
495 outb(0, io + UART_LCR);
496 mxser_disable_must_enchance_mode(io);
497 oldmcr = inb(io + UART_MCR);
498 outb(0, io + UART_MCR);
499 mxser_set_must_xon1_value(io, 0x11);
500 if ((hwid = inb(io + UART_MCR)) != 0) {
501 outb(oldmcr, io + UART_MCR);
502 return MOXA_OTHER_UART;
503 }
504
505 mxser_get_must_hardware_id(io, &hwid);
506 for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
507 if (hwid == Gpci_uart_info[i].type)
508 return (int)hwid;
509 }
510 return MOXA_OTHER_UART;
511}
512#endif
513
514static void process_txrx_fifo(struct mxser_port *info)
515{
516 int i;
517
518 if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
519 info->rx_trigger = 1;
520 info->rx_high_water = 1;
521 info->rx_low_water = 1;
522 info->xmit_fifo_size = 1;
523 } else
524 for (i = 0; i < UART_INFO_NUM; i++)
525 if (info->board->chip_flag == Gpci_uart_info[i].type) {
526 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
527 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
528 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
529 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
530 break;
531 }
532}
533
534static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
535{
536 static unsigned char mxser_msr[MXSER_PORTS + 1];
537 unsigned char status = 0;
538
539 status = inb(baseaddr + UART_MSR);
540
541 mxser_msr[port] &= 0x0F;
542 mxser_msr[port] |= status;
543 status = mxser_msr[port];
544 if (mode)
545 mxser_msr[port] = 0;
546
547 return status;
548}
549
550static int mxser_carrier_raised(struct tty_port *port)
551{
552 struct mxser_port *mp = container_of(port, struct mxser_port, port);
553 return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
554}
555
556static void mxser_dtr_rts(struct tty_port *port, int on)
557{
558 struct mxser_port *mp = container_of(port, struct mxser_port, port);
559 unsigned long flags;
560
561 spin_lock_irqsave(&mp->slock, flags);
562 if (on)
563 outb(inb(mp->ioaddr + UART_MCR) |
564 UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
565 else
566 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
567 mp->ioaddr + UART_MCR);
568 spin_unlock_irqrestore(&mp->slock, flags);
569}
570
571static int mxser_set_baud(struct tty_struct *tty, long newspd)
572{
573 struct mxser_port *info = tty->driver_data;
574 int quot = 0, baud;
575 unsigned char cval;
576
577 if (!info->ioaddr)
578 return -1;
579
580 if (newspd > info->max_baud)
581 return -1;
582
583 if (newspd == 134) {
584 quot = 2 * info->baud_base / 269;
585 tty_encode_baud_rate(tty, 134, 134);
586 } else if (newspd) {
587 quot = info->baud_base / newspd;
588 if (quot == 0)
589 quot = 1;
590 baud = info->baud_base/quot;
591 tty_encode_baud_rate(tty, baud, baud);
592 } else {
593 quot = 0;
594 }
595
596 info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
597 info->timeout += HZ / 50; /* Add .02 seconds of slop */
598
599 if (quot) {
600 info->MCR |= UART_MCR_DTR;
601 outb(info->MCR, info->ioaddr + UART_MCR);
602 } else {
603 info->MCR &= ~UART_MCR_DTR;
604 outb(info->MCR, info->ioaddr + UART_MCR);
605 return 0;
606 }
607
608 cval = inb(info->ioaddr + UART_LCR);
609
610 outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR); /* set DLAB */
611
612 outb(quot & 0xff, info->ioaddr + UART_DLL); /* LS of divisor */
613 outb(quot >> 8, info->ioaddr + UART_DLM); /* MS of divisor */
614 outb(cval, info->ioaddr + UART_LCR); /* reset DLAB */
615
616#ifdef BOTHER
617 if (C_BAUD(tty) == BOTHER) {
618 quot = info->baud_base % newspd;
619 quot *= 8;
620 if (quot % newspd > newspd / 2) {
621 quot /= newspd;
622 quot++;
623 } else
624 quot /= newspd;
625
626 mxser_set_must_enum_value(info->ioaddr, quot);
627 } else
628#endif
629 mxser_set_must_enum_value(info->ioaddr, 0);
630
631 return 0;
632}
633
634/*
635 * This routine is called to set the UART divisor registers to match
636 * the specified baud rate for a serial port.
637 */
638static int mxser_change_speed(struct tty_struct *tty,
639 struct ktermios *old_termios)
640{
641 struct mxser_port *info = tty->driver_data;
642 unsigned cflag, cval, fcr;
643 int ret = 0;
644 unsigned char status;
645
646 cflag = tty->termios.c_cflag;
647 if (!info->ioaddr)
648 return ret;
649
650 if (mxser_set_baud_method[tty->index] == 0)
651 mxser_set_baud(tty, tty_get_baud_rate(tty));
652
653 /* byte size and parity */
654 switch (cflag & CSIZE) {
655 case CS5:
656 cval = 0x00;
657 break;
658 case CS6:
659 cval = 0x01;
660 break;
661 case CS7:
662 cval = 0x02;
663 break;
664 case CS8:
665 cval = 0x03;
666 break;
667 default:
668 cval = 0x00;
669 break; /* too keep GCC shut... */
670 }
671 if (cflag & CSTOPB)
672 cval |= 0x04;
673 if (cflag & PARENB)
674 cval |= UART_LCR_PARITY;
675 if (!(cflag & PARODD))
676 cval |= UART_LCR_EPAR;
677 if (cflag & CMSPAR)
678 cval |= UART_LCR_SPAR;
679
680 if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
681 if (info->board->chip_flag) {
682 fcr = UART_FCR_ENABLE_FIFO;
683 fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
684 mxser_set_must_fifo_value(info);
685 } else
686 fcr = 0;
687 } else {
688 fcr = UART_FCR_ENABLE_FIFO;
689 if (info->board->chip_flag) {
690 fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
691 mxser_set_must_fifo_value(info);
692 } else {
693 switch (info->rx_trigger) {
694 case 1:
695 fcr |= UART_FCR_TRIGGER_1;
696 break;
697 case 4:
698 fcr |= UART_FCR_TRIGGER_4;
699 break;
700 case 8:
701 fcr |= UART_FCR_TRIGGER_8;
702 break;
703 default:
704 fcr |= UART_FCR_TRIGGER_14;
705 break;
706 }
707 }
708 }
709
710 /* CTS flow control flag and modem status interrupts */
711 info->IER &= ~UART_IER_MSI;
712 info->MCR &= ~UART_MCR_AFE;
713 if (cflag & CRTSCTS) {
714 info->port.flags |= ASYNC_CTS_FLOW;
715 info->IER |= UART_IER_MSI;
716 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
717 info->MCR |= UART_MCR_AFE;
718 } else {
719 status = inb(info->ioaddr + UART_MSR);
720 if (tty->hw_stopped) {
721 if (status & UART_MSR_CTS) {
722 tty->hw_stopped = 0;
723 if (info->type != PORT_16550A &&
724 !info->board->chip_flag) {
725 outb(info->IER & ~UART_IER_THRI,
726 info->ioaddr +
727 UART_IER);
728 info->IER |= UART_IER_THRI;
729 outb(info->IER, info->ioaddr +
730 UART_IER);
731 }
732 tty_wakeup(tty);
733 }
734 } else {
735 if (!(status & UART_MSR_CTS)) {
736 tty->hw_stopped = 1;
737 if ((info->type != PORT_16550A) &&
738 (!info->board->chip_flag)) {
739 info->IER &= ~UART_IER_THRI;
740 outb(info->IER, info->ioaddr +
741 UART_IER);
742 }
743 }
744 }
745 }
746 } else {
747 info->port.flags &= ~ASYNC_CTS_FLOW;
748 }
749 outb(info->MCR, info->ioaddr + UART_MCR);
750 if (cflag & CLOCAL) {
751 info->port.flags &= ~ASYNC_CHECK_CD;
752 } else {
753 info->port.flags |= ASYNC_CHECK_CD;
754 info->IER |= UART_IER_MSI;
755 }
756 outb(info->IER, info->ioaddr + UART_IER);
757
758 /*
759 * Set up parity check flag
760 */
761 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
762 if (I_INPCK(tty))
763 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
764 if (I_BRKINT(tty) || I_PARMRK(tty))
765 info->read_status_mask |= UART_LSR_BI;
766
767 info->ignore_status_mask = 0;
768
769 if (I_IGNBRK(tty)) {
770 info->ignore_status_mask |= UART_LSR_BI;
771 info->read_status_mask |= UART_LSR_BI;
772 /*
773 * If we're ignore parity and break indicators, ignore
774 * overruns too. (For real raw support).
775 */
776 if (I_IGNPAR(tty)) {
777 info->ignore_status_mask |=
778 UART_LSR_OE |
779 UART_LSR_PE |
780 UART_LSR_FE;
781 info->read_status_mask |=
782 UART_LSR_OE |
783 UART_LSR_PE |
784 UART_LSR_FE;
785 }
786 }
787 if (info->board->chip_flag) {
788 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
789 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
790 if (I_IXON(tty)) {
791 mxser_enable_must_rx_software_flow_control(
792 info->ioaddr);
793 } else {
794 mxser_disable_must_rx_software_flow_control(
795 info->ioaddr);
796 }
797 if (I_IXOFF(tty)) {
798 mxser_enable_must_tx_software_flow_control(
799 info->ioaddr);
800 } else {
801 mxser_disable_must_tx_software_flow_control(
802 info->ioaddr);
803 }
804 }
805
806
807 outb(fcr, info->ioaddr + UART_FCR); /* set fcr */
808 outb(cval, info->ioaddr + UART_LCR);
809
810 return ret;
811}
812
813static void mxser_check_modem_status(struct tty_struct *tty,
814 struct mxser_port *port, int status)
815{
816 /* update input line counters */
817 if (status & UART_MSR_TERI)
818 port->icount.rng++;
819 if (status & UART_MSR_DDSR)
820 port->icount.dsr++;
821 if (status & UART_MSR_DDCD)
822 port->icount.dcd++;
823 if (status & UART_MSR_DCTS)
824 port->icount.cts++;
825 port->mon_data.modem_status = status;
826 wake_up_interruptible(&port->port.delta_msr_wait);
827
828 if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
829 if (status & UART_MSR_DCD)
830 wake_up_interruptible(&port->port.open_wait);
831 }
832
833 if (tty_port_cts_enabled(&port->port)) {
834 if (tty->hw_stopped) {
835 if (status & UART_MSR_CTS) {
836 tty->hw_stopped = 0;
837
838 if ((port->type != PORT_16550A) &&
839 (!port->board->chip_flag)) {
840 outb(port->IER & ~UART_IER_THRI,
841 port->ioaddr + UART_IER);
842 port->IER |= UART_IER_THRI;
843 outb(port->IER, port->ioaddr +
844 UART_IER);
845 }
846 tty_wakeup(tty);
847 }
848 } else {
849 if (!(status & UART_MSR_CTS)) {
850 tty->hw_stopped = 1;
851 if (port->type != PORT_16550A &&
852 !port->board->chip_flag) {
853 port->IER &= ~UART_IER_THRI;
854 outb(port->IER, port->ioaddr +
855 UART_IER);
856 }
857 }
858 }
859 }
860}
861
862static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
863{
864 struct mxser_port *info = container_of(port, struct mxser_port, port);
865 unsigned long page;
866 unsigned long flags;
867
868 page = __get_free_page(GFP_KERNEL);
869 if (!page)
870 return -ENOMEM;
871
872 spin_lock_irqsave(&info->slock, flags);
873
874 if (!info->ioaddr || !info->type) {
875 set_bit(TTY_IO_ERROR, &tty->flags);
876 free_page(page);
877 spin_unlock_irqrestore(&info->slock, flags);
878 return 0;
879 }
880 info->port.xmit_buf = (unsigned char *) page;
881
882 /*
883 * Clear the FIFO buffers and disable them
884 * (they will be reenabled in mxser_change_speed())
885 */
886 if (info->board->chip_flag)
887 outb((UART_FCR_CLEAR_RCVR |
888 UART_FCR_CLEAR_XMIT |
889 MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
890 else
891 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
892 info->ioaddr + UART_FCR);
893
894 /*
895 * At this point there's no way the LSR could still be 0xFF;
896 * if it is, then bail out, because there's likely no UART
897 * here.
898 */
899 if (inb(info->ioaddr + UART_LSR) == 0xff) {
900 spin_unlock_irqrestore(&info->slock, flags);
901 if (capable(CAP_SYS_ADMIN)) {
902 set_bit(TTY_IO_ERROR, &tty->flags);
903 return 0;
904 } else
905 return -ENODEV;
906 }
907
908 /*
909 * Clear the interrupt registers.
910 */
911 (void) inb(info->ioaddr + UART_LSR);
912 (void) inb(info->ioaddr + UART_RX);
913 (void) inb(info->ioaddr + UART_IIR);
914 (void) inb(info->ioaddr + UART_MSR);
915
916 /*
917 * Now, initialize the UART
918 */
919 outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR); /* reset DLAB */
920 info->MCR = UART_MCR_DTR | UART_MCR_RTS;
921 outb(info->MCR, info->ioaddr + UART_MCR);
922
923 /*
924 * Finally, enable interrupts
925 */
926 info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
927
928 if (info->board->chip_flag)
929 info->IER |= MOXA_MUST_IER_EGDAI;
930 outb(info->IER, info->ioaddr + UART_IER); /* enable interrupts */
931
932 /*
933 * And clear the interrupt registers again for luck.
934 */
935 (void) inb(info->ioaddr + UART_LSR);
936 (void) inb(info->ioaddr + UART_RX);
937 (void) inb(info->ioaddr + UART_IIR);
938 (void) inb(info->ioaddr + UART_MSR);
939
940 clear_bit(TTY_IO_ERROR, &tty->flags);
941 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
942
943 /*
944 * and set the speed of the serial port
945 */
946 mxser_change_speed(tty, NULL);
947 spin_unlock_irqrestore(&info->slock, flags);
948
949 return 0;
950}
951
952/*
953 * This routine will shutdown a serial port
954 */
955static void mxser_shutdown_port(struct tty_port *port)
956{
957 struct mxser_port *info = container_of(port, struct mxser_port, port);
958 unsigned long flags;
959
960 spin_lock_irqsave(&info->slock, flags);
961
962 /*
963 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
964 * here so the queue might never be waken up
965 */
966 wake_up_interruptible(&info->port.delta_msr_wait);
967
968 /*
969 * Free the xmit buffer, if necessary
970 */
971 if (info->port.xmit_buf) {
972 free_page((unsigned long) info->port.xmit_buf);
973 info->port.xmit_buf = NULL;
974 }
975
976 info->IER = 0;
977 outb(0x00, info->ioaddr + UART_IER);
978
979 /* clear Rx/Tx FIFO's */
980 if (info->board->chip_flag)
981 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
982 MOXA_MUST_FCR_GDA_MODE_ENABLE,
983 info->ioaddr + UART_FCR);
984 else
985 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
986 info->ioaddr + UART_FCR);
987
988 /* read data port to reset things */
989 (void) inb(info->ioaddr + UART_RX);
990
991
992 if (info->board->chip_flag)
993 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
994
995 spin_unlock_irqrestore(&info->slock, flags);
996}
997
998/*
999 * This routine is called whenever a serial port is opened. It
1000 * enables interrupts for a serial port, linking in its async structure into
1001 * the IRQ chain. It also performs the serial-specific
1002 * initialization for the tty structure.
1003 */
1004static int mxser_open(struct tty_struct *tty, struct file *filp)
1005{
1006 struct mxser_port *info;
1007 int line;
1008
1009 line = tty->index;
1010 if (line == MXSER_PORTS)
1011 return 0;
1012 info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1013 if (!info->ioaddr)
1014 return -ENODEV;
1015
1016 tty->driver_data = info;
1017 return tty_port_open(&info->port, tty, filp);
1018}
1019
1020static void mxser_flush_buffer(struct tty_struct *tty)
1021{
1022 struct mxser_port *info = tty->driver_data;
1023 char fcr;
1024 unsigned long flags;
1025
1026
1027 spin_lock_irqsave(&info->slock, flags);
1028 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1029
1030 fcr = inb(info->ioaddr + UART_FCR);
1031 outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1032 info->ioaddr + UART_FCR);
1033 outb(fcr, info->ioaddr + UART_FCR);
1034
1035 spin_unlock_irqrestore(&info->slock, flags);
1036
1037 tty_wakeup(tty);
1038}
1039
1040
1041static void mxser_close_port(struct tty_port *port)
1042{
1043 struct mxser_port *info = container_of(port, struct mxser_port, port);
1044 unsigned long timeout;
1045 /*
1046 * At this point we stop accepting input. To do this, we
1047 * disable the receive line status interrupts, and tell the
1048 * interrupt driver to stop checking the data ready bit in the
1049 * line status register.
1050 */
1051 info->IER &= ~UART_IER_RLSI;
1052 if (info->board->chip_flag)
1053 info->IER &= ~MOXA_MUST_RECV_ISR;
1054
1055 outb(info->IER, info->ioaddr + UART_IER);
1056 /*
1057 * Before we drop DTR, make sure the UART transmitter
1058 * has completely drained; this is especially
1059 * important if there is a transmit FIFO!
1060 */
1061 timeout = jiffies + HZ;
1062 while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1063 schedule_timeout_interruptible(5);
1064 if (time_after(jiffies, timeout))
1065 break;
1066 }
1067}
1068
1069/*
1070 * This routine is called when the serial port gets closed. First, we
1071 * wait for the last remaining data to be sent. Then, we unlink its
1072 * async structure from the interrupt chain if necessary, and we free
1073 * that IRQ if nothing is left in the chain.
1074 */
1075static void mxser_close(struct tty_struct *tty, struct file *filp)
1076{
1077 struct mxser_port *info = tty->driver_data;
1078 struct tty_port *port = &info->port;
1079
1080 if (tty->index == MXSER_PORTS || info == NULL)
1081 return;
1082 if (tty_port_close_start(port, tty, filp) == 0)
1083 return;
1084 mutex_lock(&port->mutex);
1085 mxser_close_port(port);
1086 mxser_flush_buffer(tty);
1087 if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
1088 if (C_HUPCL(tty))
1089 tty_port_lower_dtr_rts(port);
1090 }
1091 mxser_shutdown_port(port);
1092 clear_bit(ASYNCB_INITIALIZED, &port->flags);
1093 mutex_unlock(&port->mutex);
1094 /* Right now the tty_port set is done outside of the close_end helper
1095 as we don't yet have everyone using refcounts */
1096 tty_port_close_end(port, tty);
1097 tty_port_tty_set(port, NULL);
1098}
1099
1100static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1101{
1102 int c, total = 0;
1103 struct mxser_port *info = tty->driver_data;
1104 unsigned long flags;
1105
1106 if (!info->port.xmit_buf)
1107 return 0;
1108
1109 while (1) {
1110 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1111 SERIAL_XMIT_SIZE - info->xmit_head));
1112 if (c <= 0)
1113 break;
1114
1115 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1116 spin_lock_irqsave(&info->slock, flags);
1117 info->xmit_head = (info->xmit_head + c) &
1118 (SERIAL_XMIT_SIZE - 1);
1119 info->xmit_cnt += c;
1120 spin_unlock_irqrestore(&info->slock, flags);
1121
1122 buf += c;
1123 count -= c;
1124 total += c;
1125 }
1126
1127 if (info->xmit_cnt && !tty->stopped) {
1128 if (!tty->hw_stopped ||
1129 (info->type == PORT_16550A) ||
1130 (info->board->chip_flag)) {
1131 spin_lock_irqsave(&info->slock, flags);
1132 outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1133 UART_IER);
1134 info->IER |= UART_IER_THRI;
1135 outb(info->IER, info->ioaddr + UART_IER);
1136 spin_unlock_irqrestore(&info->slock, flags);
1137 }
1138 }
1139 return total;
1140}
1141
1142static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1143{
1144 struct mxser_port *info = tty->driver_data;
1145 unsigned long flags;
1146
1147 if (!info->port.xmit_buf)
1148 return 0;
1149
1150 if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1151 return 0;
1152
1153 spin_lock_irqsave(&info->slock, flags);
1154 info->port.xmit_buf[info->xmit_head++] = ch;
1155 info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1156 info->xmit_cnt++;
1157 spin_unlock_irqrestore(&info->slock, flags);
1158 if (!tty->stopped) {
1159 if (!tty->hw_stopped ||
1160 (info->type == PORT_16550A) ||
1161 info->board->chip_flag) {
1162 spin_lock_irqsave(&info->slock, flags);
1163 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1164 info->IER |= UART_IER_THRI;
1165 outb(info->IER, info->ioaddr + UART_IER);
1166 spin_unlock_irqrestore(&info->slock, flags);
1167 }
1168 }
1169 return 1;
1170}
1171
1172
1173static void mxser_flush_chars(struct tty_struct *tty)
1174{
1175 struct mxser_port *info = tty->driver_data;
1176 unsigned long flags;
1177
1178 if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1179 (tty->hw_stopped && info->type != PORT_16550A &&
1180 !info->board->chip_flag))
1181 return;
1182
1183 spin_lock_irqsave(&info->slock, flags);
1184
1185 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1186 info->IER |= UART_IER_THRI;
1187 outb(info->IER, info->ioaddr + UART_IER);
1188
1189 spin_unlock_irqrestore(&info->slock, flags);
1190}
1191
1192static int mxser_write_room(struct tty_struct *tty)
1193{
1194 struct mxser_port *info = tty->driver_data;
1195 int ret;
1196
1197 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1198 return ret < 0 ? 0 : ret;
1199}
1200
1201static int mxser_chars_in_buffer(struct tty_struct *tty)
1202{
1203 struct mxser_port *info = tty->driver_data;
1204 return info->xmit_cnt;
1205}
1206
1207/*
1208 * ------------------------------------------------------------
1209 * friends of mxser_ioctl()
1210 * ------------------------------------------------------------
1211 */
1212static int mxser_get_serial_info(struct tty_struct *tty,
1213 struct serial_struct __user *retinfo)
1214{
1215 struct mxser_port *info = tty->driver_data;
1216 struct serial_struct tmp = {
1217 .type = info->type,
1218 .line = tty->index,
1219 .port = info->ioaddr,
1220 .irq = info->board->irq,
1221 .flags = info->port.flags,
1222 .baud_base = info->baud_base,
1223 .close_delay = info->port.close_delay,
1224 .closing_wait = info->port.closing_wait,
1225 .custom_divisor = info->custom_divisor,
1226 .hub6 = 0
1227 };
1228 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1229 return -EFAULT;
1230 return 0;
1231}
1232
1233static int mxser_set_serial_info(struct tty_struct *tty,
1234 struct serial_struct __user *new_info)
1235{
1236 struct mxser_port *info = tty->driver_data;
1237 struct tty_port *port = &info->port;
1238 struct serial_struct new_serial;
1239 speed_t baud;
1240 unsigned long sl_flags;
1241 unsigned int flags;
1242 int retval = 0;
1243
1244 if (!new_info || !info->ioaddr)
1245 return -ENODEV;
1246 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1247 return -EFAULT;
1248
1249 if (new_serial.irq != info->board->irq ||
1250 new_serial.port != info->ioaddr)
1251 return -EINVAL;
1252
1253 flags = port->flags & ASYNC_SPD_MASK;
1254
1255 if (!capable(CAP_SYS_ADMIN)) {
1256 if ((new_serial.baud_base != info->baud_base) ||
1257 (new_serial.close_delay != info->port.close_delay) ||
1258 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1259 return -EPERM;
1260 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1261 (new_serial.flags & ASYNC_USR_MASK));
1262 } else {
1263 /*
1264 * OK, past this point, all the error checking has been done.
1265 * At this point, we start making changes.....
1266 */
1267 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1268 (new_serial.flags & ASYNC_FLAGS));
1269 port->close_delay = new_serial.close_delay * HZ / 100;
1270 port->closing_wait = new_serial.closing_wait * HZ / 100;
1271 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1272 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1273 (new_serial.baud_base != info->baud_base ||
1274 new_serial.custom_divisor !=
1275 info->custom_divisor)) {
1276 if (new_serial.custom_divisor == 0)
1277 return -EINVAL;
1278 baud = new_serial.baud_base / new_serial.custom_divisor;
1279 tty_encode_baud_rate(tty, baud, baud);
1280 }
1281 }
1282
1283 info->type = new_serial.type;
1284
1285 process_txrx_fifo(info);
1286
1287 if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
1288 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1289 spin_lock_irqsave(&info->slock, sl_flags);
1290 mxser_change_speed(tty, NULL);
1291 spin_unlock_irqrestore(&info->slock, sl_flags);
1292 }
1293 } else {
1294 retval = mxser_activate(port, tty);
1295 if (retval == 0)
1296 set_bit(ASYNCB_INITIALIZED, &port->flags);
1297 }
1298 return retval;
1299}
1300
1301/*
1302 * mxser_get_lsr_info - get line status register info
1303 *
1304 * Purpose: Let user call ioctl() to get info when the UART physically
1305 * is emptied. On bus types like RS485, the transmitter must
1306 * release the bus after transmitting. This must be done when
1307 * the transmit shift register is empty, not be done when the
1308 * transmit holding register is empty. This functionality
1309 * allows an RS485 driver to be written in user space.
1310 */
1311static int mxser_get_lsr_info(struct mxser_port *info,
1312 unsigned int __user *value)
1313{
1314 unsigned char status;
1315 unsigned int result;
1316 unsigned long flags;
1317
1318 spin_lock_irqsave(&info->slock, flags);
1319 status = inb(info->ioaddr + UART_LSR);
1320 spin_unlock_irqrestore(&info->slock, flags);
1321 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1322 return put_user(result, value);
1323}
1324
1325static int mxser_tiocmget(struct tty_struct *tty)
1326{
1327 struct mxser_port *info = tty->driver_data;
1328 unsigned char control, status;
1329 unsigned long flags;
1330
1331
1332 if (tty->index == MXSER_PORTS)
1333 return -ENOIOCTLCMD;
1334 if (test_bit(TTY_IO_ERROR, &tty->flags))
1335 return -EIO;
1336
1337 control = info->MCR;
1338
1339 spin_lock_irqsave(&info->slock, flags);
1340 status = inb(info->ioaddr + UART_MSR);
1341 if (status & UART_MSR_ANY_DELTA)
1342 mxser_check_modem_status(tty, info, status);
1343 spin_unlock_irqrestore(&info->slock, flags);
1344 return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1345 ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1346 ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1347 ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1348 ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1349 ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1350}
1351
1352static int mxser_tiocmset(struct tty_struct *tty,
1353 unsigned int set, unsigned int clear)
1354{
1355 struct mxser_port *info = tty->driver_data;
1356 unsigned long flags;
1357
1358
1359 if (tty->index == MXSER_PORTS)
1360 return -ENOIOCTLCMD;
1361 if (test_bit(TTY_IO_ERROR, &tty->flags))
1362 return -EIO;
1363
1364 spin_lock_irqsave(&info->slock, flags);
1365
1366 if (set & TIOCM_RTS)
1367 info->MCR |= UART_MCR_RTS;
1368 if (set & TIOCM_DTR)
1369 info->MCR |= UART_MCR_DTR;
1370
1371 if (clear & TIOCM_RTS)
1372 info->MCR &= ~UART_MCR_RTS;
1373 if (clear & TIOCM_DTR)
1374 info->MCR &= ~UART_MCR_DTR;
1375
1376 outb(info->MCR, info->ioaddr + UART_MCR);
1377 spin_unlock_irqrestore(&info->slock, flags);
1378 return 0;
1379}
1380
1381static int __init mxser_program_mode(int port)
1382{
1383 int id, i, j, n;
1384
1385 outb(0, port);
1386 outb(0, port);
1387 outb(0, port);
1388 (void)inb(port);
1389 (void)inb(port);
1390 outb(0, port);
1391 (void)inb(port);
1392
1393 id = inb(port + 1) & 0x1F;
1394 if ((id != C168_ASIC_ID) &&
1395 (id != C104_ASIC_ID) &&
1396 (id != C102_ASIC_ID) &&
1397 (id != CI132_ASIC_ID) &&
1398 (id != CI134_ASIC_ID) &&
1399 (id != CI104J_ASIC_ID))
1400 return -1;
1401 for (i = 0, j = 0; i < 4; i++) {
1402 n = inb(port + 2);
1403 if (n == 'M') {
1404 j = 1;
1405 } else if ((j == 1) && (n == 1)) {
1406 j = 2;
1407 break;
1408 } else
1409 j = 0;
1410 }
1411 if (j != 2)
1412 id = -2;
1413 return id;
1414}
1415
1416static void __init mxser_normal_mode(int port)
1417{
1418 int i, n;
1419
1420 outb(0xA5, port + 1);
1421 outb(0x80, port + 3);
1422 outb(12, port + 0); /* 9600 bps */
1423 outb(0, port + 1);
1424 outb(0x03, port + 3); /* 8 data bits */
1425 outb(0x13, port + 4); /* loop back mode */
1426 for (i = 0; i < 16; i++) {
1427 n = inb(port + 5);
1428 if ((n & 0x61) == 0x60)
1429 break;
1430 if ((n & 1) == 1)
1431 (void)inb(port);
1432 }
1433 outb(0x00, port + 4);
1434}
1435
1436#define CHIP_SK 0x01 /* Serial Data Clock in Eprom */
1437#define CHIP_DO 0x02 /* Serial Data Output in Eprom */
1438#define CHIP_CS 0x04 /* Serial Chip Select in Eprom */
1439#define CHIP_DI 0x08 /* Serial Data Input in Eprom */
1440#define EN_CCMD 0x000 /* Chip's command register */
1441#define EN0_RSARLO 0x008 /* Remote start address reg 0 */
1442#define EN0_RSARHI 0x009 /* Remote start address reg 1 */
1443#define EN0_RCNTLO 0x00A /* Remote byte count reg WR */
1444#define EN0_RCNTHI 0x00B /* Remote byte count reg WR */
1445#define EN0_DCFG 0x00E /* Data configuration reg WR */
1446#define EN0_PORT 0x010 /* Rcv missed frame error counter RD */
1447#define ENC_PAGE0 0x000 /* Select page 0 of chip registers */
1448#define ENC_PAGE3 0x0C0 /* Select page 3 of chip registers */
1449static int __init mxser_read_register(int port, unsigned short *regs)
1450{
1451 int i, k, value, id;
1452 unsigned int j;
1453
1454 id = mxser_program_mode(port);
1455 if (id < 0)
1456 return id;
1457 for (i = 0; i < 14; i++) {
1458 k = (i & 0x3F) | 0x180;
1459 for (j = 0x100; j > 0; j >>= 1) {
1460 outb(CHIP_CS, port);
1461 if (k & j) {
1462 outb(CHIP_CS | CHIP_DO, port);
1463 outb(CHIP_CS | CHIP_DO | CHIP_SK, port); /* A? bit of read */
1464 } else {
1465 outb(CHIP_CS, port);
1466 outb(CHIP_CS | CHIP_SK, port); /* A? bit of read */
1467 }
1468 }
1469 (void)inb(port);
1470 value = 0;
1471 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1472 outb(CHIP_CS, port);
1473 outb(CHIP_CS | CHIP_SK, port);
1474 if (inb(port) & CHIP_DI)
1475 value |= j;
1476 }
1477 regs[i] = value;
1478 outb(0, port);
1479 }
1480 mxser_normal_mode(port);
1481 return id;
1482}
1483
1484static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1485{
1486 struct mxser_port *ip;
1487 struct tty_port *port;
1488 struct tty_struct *tty;
1489 int result, status;
1490 unsigned int i, j;
1491 int ret = 0;
1492
1493 switch (cmd) {
1494 case MOXA_GET_MAJOR:
1495 printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1496 "%x (GET_MAJOR), fix your userspace\n",
1497 current->comm, cmd);
1498 return put_user(ttymajor, (int __user *)argp);
1499
1500 case MOXA_CHKPORTENABLE:
1501 result = 0;
1502 for (i = 0; i < MXSER_BOARDS; i++)
1503 for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1504 if (mxser_boards[i].ports[j].ioaddr)
1505 result |= (1 << i);
1506 return put_user(result, (unsigned long __user *)argp);
1507 case MOXA_GETDATACOUNT:
1508 /* The receive side is locked by port->slock but it isn't
1509 clear that an exact snapshot is worth copying here */
1510 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1511 ret = -EFAULT;
1512 return ret;
1513 case MOXA_GETMSTATUS: {
1514 struct mxser_mstatus ms, __user *msu = argp;
1515 for (i = 0; i < MXSER_BOARDS; i++)
1516 for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1517 ip = &mxser_boards[i].ports[j];
1518 port = &ip->port;
1519 memset(&ms, 0, sizeof(ms));
1520
1521 mutex_lock(&port->mutex);
1522 if (!ip->ioaddr)
1523 goto copy;
1524
1525 tty = tty_port_tty_get(port);
1526
1527 if (!tty)
1528 ms.cflag = ip->normal_termios.c_cflag;
1529 else
1530 ms.cflag = tty->termios.c_cflag;
1531 tty_kref_put(tty);
1532 spin_lock_irq(&ip->slock);
1533 status = inb(ip->ioaddr + UART_MSR);
1534 spin_unlock_irq(&ip->slock);
1535 if (status & UART_MSR_DCD)
1536 ms.dcd = 1;
1537 if (status & UART_MSR_DSR)
1538 ms.dsr = 1;
1539 if (status & UART_MSR_CTS)
1540 ms.cts = 1;
1541 copy:
1542 mutex_unlock(&port->mutex);
1543 if (copy_to_user(msu, &ms, sizeof(ms)))
1544 return -EFAULT;
1545 msu++;
1546 }
1547 return 0;
1548 }
1549 case MOXA_ASPP_MON_EXT: {
1550 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1551 unsigned int cflag, iflag, p;
1552 u8 opmode;
1553
1554 me = kzalloc(sizeof(*me), GFP_KERNEL);
1555 if (!me)
1556 return -ENOMEM;
1557
1558 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1559 for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1560 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1561 i = MXSER_BOARDS;
1562 break;
1563 }
1564 ip = &mxser_boards[i].ports[j];
1565 port = &ip->port;
1566
1567 mutex_lock(&port->mutex);
1568 if (!ip->ioaddr) {
1569 mutex_unlock(&port->mutex);
1570 continue;
1571 }
1572
1573 spin_lock_irq(&ip->slock);
1574 status = mxser_get_msr(ip->ioaddr, 0, p);
1575
1576 if (status & UART_MSR_TERI)
1577 ip->icount.rng++;
1578 if (status & UART_MSR_DDSR)
1579 ip->icount.dsr++;
1580 if (status & UART_MSR_DDCD)
1581 ip->icount.dcd++;
1582 if (status & UART_MSR_DCTS)
1583 ip->icount.cts++;
1584
1585 ip->mon_data.modem_status = status;
1586 me->rx_cnt[p] = ip->mon_data.rxcnt;
1587 me->tx_cnt[p] = ip->mon_data.txcnt;
1588 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1589 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1590 me->modem_status[p] =
1591 ip->mon_data.modem_status;
1592 spin_unlock_irq(&ip->slock);
1593
1594 tty = tty_port_tty_get(&ip->port);
1595
1596 if (!tty) {
1597 cflag = ip->normal_termios.c_cflag;
1598 iflag = ip->normal_termios.c_iflag;
1599 me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1600 } else {
1601 cflag = tty->termios.c_cflag;
1602 iflag = tty->termios.c_iflag;
1603 me->baudrate[p] = tty_get_baud_rate(tty);
1604 }
1605 tty_kref_put(tty);
1606
1607 me->databits[p] = cflag & CSIZE;
1608 me->stopbits[p] = cflag & CSTOPB;
1609 me->parity[p] = cflag & (PARENB | PARODD |
1610 CMSPAR);
1611
1612 if (cflag & CRTSCTS)
1613 me->flowctrl[p] |= 0x03;
1614
1615 if (iflag & (IXON | IXOFF))
1616 me->flowctrl[p] |= 0x0C;
1617
1618 if (ip->type == PORT_16550A)
1619 me->fifo[p] = 1;
1620
1621 if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
1622 opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1623 opmode &= OP_MODE_MASK;
1624 } else {
1625 opmode = RS232_MODE;
1626 }
1627 me->iftype[p] = opmode;
1628 mutex_unlock(&port->mutex);
1629 }
1630 }
1631 if (copy_to_user(argp, me, sizeof(*me)))
1632 ret = -EFAULT;
1633 kfree(me);
1634 return ret;
1635 }
1636 default:
1637 return -ENOIOCTLCMD;
1638 }
1639 return 0;
1640}
1641
1642static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1643 struct async_icount *cprev)
1644{
1645 struct async_icount cnow;
1646 unsigned long flags;
1647 int ret;
1648
1649 spin_lock_irqsave(&info->slock, flags);
1650 cnow = info->icount; /* atomic copy */
1651 spin_unlock_irqrestore(&info->slock, flags);
1652
1653 ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1654 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1655 ((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1656 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1657
1658 *cprev = cnow;
1659
1660 return ret;
1661}
1662
1663static int mxser_ioctl(struct tty_struct *tty,
1664 unsigned int cmd, unsigned long arg)
1665{
1666 struct mxser_port *info = tty->driver_data;
1667 struct tty_port *port = &info->port;
1668 struct async_icount cnow;
1669 unsigned long flags;
1670 void __user *argp = (void __user *)arg;
1671 int retval;
1672
1673 if (tty->index == MXSER_PORTS)
1674 return mxser_ioctl_special(cmd, argp);
1675
1676 if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1677 int p;
1678 unsigned long opmode;
1679 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1680 int shiftbit;
1681 unsigned char val, mask;
1682
1683 if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
1684 return -EFAULT;
1685
1686 p = tty->index % 4;
1687 if (cmd == MOXA_SET_OP_MODE) {
1688 if (get_user(opmode, (int __user *) argp))
1689 return -EFAULT;
1690 if (opmode != RS232_MODE &&
1691 opmode != RS485_2WIRE_MODE &&
1692 opmode != RS422_MODE &&
1693 opmode != RS485_4WIRE_MODE)
1694 return -EFAULT;
1695 mask = ModeMask[p];
1696 shiftbit = p * 2;
1697 spin_lock_irq(&info->slock);
1698 val = inb(info->opmode_ioaddr);
1699 val &= mask;
1700 val |= (opmode << shiftbit);
1701 outb(val, info->opmode_ioaddr);
1702 spin_unlock_irq(&info->slock);
1703 } else {
1704 shiftbit = p * 2;
1705 spin_lock_irq(&info->slock);
1706 opmode = inb(info->opmode_ioaddr) >> shiftbit;
1707 spin_unlock_irq(&info->slock);
1708 opmode &= OP_MODE_MASK;
1709 if (put_user(opmode, (int __user *)argp))
1710 return -EFAULT;
1711 }
1712 return 0;
1713 }
1714
1715 if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT &&
1716 test_bit(TTY_IO_ERROR, &tty->flags))
1717 return -EIO;
1718
1719 switch (cmd) {
1720 case TIOCGSERIAL:
1721 mutex_lock(&port->mutex);
1722 retval = mxser_get_serial_info(tty, argp);
1723 mutex_unlock(&port->mutex);
1724 return retval;
1725 case TIOCSSERIAL:
1726 mutex_lock(&port->mutex);
1727 retval = mxser_set_serial_info(tty, argp);
1728 mutex_unlock(&port->mutex);
1729 return retval;
1730 case TIOCSERGETLSR: /* Get line status register */
1731 return mxser_get_lsr_info(info, argp);
1732 /*
1733 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1734 * - mask passed in arg for lines of interest
1735 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1736 * Caller should use TIOCGICOUNT to see which one it was
1737 */
1738 case TIOCMIWAIT:
1739 spin_lock_irqsave(&info->slock, flags);
1740 cnow = info->icount; /* note the counters on entry */
1741 spin_unlock_irqrestore(&info->slock, flags);
1742
1743 return wait_event_interruptible(info->port.delta_msr_wait,
1744 mxser_cflags_changed(info, arg, &cnow));
1745 case MOXA_HighSpeedOn:
1746 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1747 case MOXA_SDS_RSTICOUNTER:
1748 spin_lock_irq(&info->slock);
1749 info->mon_data.rxcnt = 0;
1750 info->mon_data.txcnt = 0;
1751 spin_unlock_irq(&info->slock);
1752 return 0;
1753
1754 case MOXA_ASPP_OQUEUE:{
1755 int len, lsr;
1756
1757 len = mxser_chars_in_buffer(tty);
1758 spin_lock_irq(&info->slock);
1759 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1760 spin_unlock_irq(&info->slock);
1761 len += (lsr ? 0 : 1);
1762
1763 return put_user(len, (int __user *)argp);
1764 }
1765 case MOXA_ASPP_MON: {
1766 int mcr, status;
1767
1768 spin_lock_irq(&info->slock);
1769 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1770 mxser_check_modem_status(tty, info, status);
1771
1772 mcr = inb(info->ioaddr + UART_MCR);
1773 spin_unlock_irq(&info->slock);
1774
1775 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1776 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1777 else
1778 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1779
1780 if (mcr & MOXA_MUST_MCR_TX_XON)
1781 info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1782 else
1783 info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1784
1785 if (tty->hw_stopped)
1786 info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1787 else
1788 info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1789
1790 if (copy_to_user(argp, &info->mon_data,
1791 sizeof(struct mxser_mon)))
1792 return -EFAULT;
1793
1794 return 0;
1795 }
1796 case MOXA_ASPP_LSTATUS: {
1797 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1798 return -EFAULT;
1799
1800 info->err_shadow = 0;
1801 return 0;
1802 }
1803 case MOXA_SET_BAUD_METHOD: {
1804 int method;
1805
1806 if (get_user(method, (int __user *)argp))
1807 return -EFAULT;
1808 mxser_set_baud_method[tty->index] = method;
1809 return put_user(method, (int __user *)argp);
1810 }
1811 default:
1812 return -ENOIOCTLCMD;
1813 }
1814 return 0;
1815}
1816
1817 /*
1818 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1819 * Return: write counters to the user passed counter struct
1820 * NB: both 1->0 and 0->1 transitions are counted except for
1821 * RI where only 0->1 is counted.
1822 */
1823
1824static int mxser_get_icount(struct tty_struct *tty,
1825 struct serial_icounter_struct *icount)
1826
1827{
1828 struct mxser_port *info = tty->driver_data;
1829 struct async_icount cnow;
1830 unsigned long flags;
1831
1832 spin_lock_irqsave(&info->slock, flags);
1833 cnow = info->icount;
1834 spin_unlock_irqrestore(&info->slock, flags);
1835
1836 icount->frame = cnow.frame;
1837 icount->brk = cnow.brk;
1838 icount->overrun = cnow.overrun;
1839 icount->buf_overrun = cnow.buf_overrun;
1840 icount->parity = cnow.parity;
1841 icount->rx = cnow.rx;
1842 icount->tx = cnow.tx;
1843 icount->cts = cnow.cts;
1844 icount->dsr = cnow.dsr;
1845 icount->rng = cnow.rng;
1846 icount->dcd = cnow.dcd;
1847 return 0;
1848}
1849
1850static void mxser_stoprx(struct tty_struct *tty)
1851{
1852 struct mxser_port *info = tty->driver_data;
1853
1854 info->ldisc_stop_rx = 1;
1855 if (I_IXOFF(tty)) {
1856 if (info->board->chip_flag) {
1857 info->IER &= ~MOXA_MUST_RECV_ISR;
1858 outb(info->IER, info->ioaddr + UART_IER);
1859 } else {
1860 info->x_char = STOP_CHAR(tty);
1861 outb(0, info->ioaddr + UART_IER);
1862 info->IER |= UART_IER_THRI;
1863 outb(info->IER, info->ioaddr + UART_IER);
1864 }
1865 }
1866
1867 if (tty->termios.c_cflag & CRTSCTS) {
1868 info->MCR &= ~UART_MCR_RTS;
1869 outb(info->MCR, info->ioaddr + UART_MCR);
1870 }
1871}
1872
1873/*
1874 * This routine is called by the upper-layer tty layer to signal that
1875 * incoming characters should be throttled.
1876 */
1877static void mxser_throttle(struct tty_struct *tty)
1878{
1879 mxser_stoprx(tty);
1880}
1881
1882static void mxser_unthrottle(struct tty_struct *tty)
1883{
1884 struct mxser_port *info = tty->driver_data;
1885
1886 /* startrx */
1887 info->ldisc_stop_rx = 0;
1888 if (I_IXOFF(tty)) {
1889 if (info->x_char)
1890 info->x_char = 0;
1891 else {
1892 if (info->board->chip_flag) {
1893 info->IER |= MOXA_MUST_RECV_ISR;
1894 outb(info->IER, info->ioaddr + UART_IER);
1895 } else {
1896 info->x_char = START_CHAR(tty);
1897 outb(0, info->ioaddr + UART_IER);
1898 info->IER |= UART_IER_THRI;
1899 outb(info->IER, info->ioaddr + UART_IER);
1900 }
1901 }
1902 }
1903
1904 if (tty->termios.c_cflag & CRTSCTS) {
1905 info->MCR |= UART_MCR_RTS;
1906 outb(info->MCR, info->ioaddr + UART_MCR);
1907 }
1908}
1909
1910/*
1911 * mxser_stop() and mxser_start()
1912 *
1913 * This routines are called before setting or resetting tty->stopped.
1914 * They enable or disable transmitter interrupts, as necessary.
1915 */
1916static void mxser_stop(struct tty_struct *tty)
1917{
1918 struct mxser_port *info = tty->driver_data;
1919 unsigned long flags;
1920
1921 spin_lock_irqsave(&info->slock, flags);
1922 if (info->IER & UART_IER_THRI) {
1923 info->IER &= ~UART_IER_THRI;
1924 outb(info->IER, info->ioaddr + UART_IER);
1925 }
1926 spin_unlock_irqrestore(&info->slock, flags);
1927}
1928
1929static void mxser_start(struct tty_struct *tty)
1930{
1931 struct mxser_port *info = tty->driver_data;
1932 unsigned long flags;
1933
1934 spin_lock_irqsave(&info->slock, flags);
1935 if (info->xmit_cnt && info->port.xmit_buf) {
1936 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1937 info->IER |= UART_IER_THRI;
1938 outb(info->IER, info->ioaddr + UART_IER);
1939 }
1940 spin_unlock_irqrestore(&info->slock, flags);
1941}
1942
1943static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1944{
1945 struct mxser_port *info = tty->driver_data;
1946 unsigned long flags;
1947
1948 spin_lock_irqsave(&info->slock, flags);
1949 mxser_change_speed(tty, old_termios);
1950 spin_unlock_irqrestore(&info->slock, flags);
1951
1952 if ((old_termios->c_cflag & CRTSCTS) &&
1953 !(tty->termios.c_cflag & CRTSCTS)) {
1954 tty->hw_stopped = 0;
1955 mxser_start(tty);
1956 }
1957
1958 /* Handle sw stopped */
1959 if ((old_termios->c_iflag & IXON) &&
1960 !(tty->termios.c_iflag & IXON)) {
1961 tty->stopped = 0;
1962
1963 if (info->board->chip_flag) {
1964 spin_lock_irqsave(&info->slock, flags);
1965 mxser_disable_must_rx_software_flow_control(
1966 info->ioaddr);
1967 spin_unlock_irqrestore(&info->slock, flags);
1968 }
1969
1970 mxser_start(tty);
1971 }
1972}
1973
1974/*
1975 * mxser_wait_until_sent() --- wait until the transmitter is empty
1976 */
1977static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1978{
1979 struct mxser_port *info = tty->driver_data;
1980 unsigned long orig_jiffies, char_time;
1981 unsigned long flags;
1982 int lsr;
1983
1984 if (info->type == PORT_UNKNOWN)
1985 return;
1986
1987 if (info->xmit_fifo_size == 0)
1988 return; /* Just in case.... */
1989
1990 orig_jiffies = jiffies;
1991 /*
1992 * Set the check interval to be 1/5 of the estimated time to
1993 * send a single character, and make it at least 1. The check
1994 * interval should also be less than the timeout.
1995 *
1996 * Note: we have to use pretty tight timings here to satisfy
1997 * the NIST-PCTS.
1998 */
1999 char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
2000 char_time = char_time / 5;
2001 if (char_time == 0)
2002 char_time = 1;
2003 if (timeout && timeout < char_time)
2004 char_time = timeout;
2005 /*
2006 * If the transmitter hasn't cleared in twice the approximate
2007 * amount of time to send the entire FIFO, it probably won't
2008 * ever clear. This assumes the UART isn't doing flow
2009 * control, which is currently the case. Hence, if it ever
2010 * takes longer than info->timeout, this is probably due to a
2011 * UART bug of some kind. So, we clamp the timeout parameter at
2012 * 2*info->timeout.
2013 */
2014 if (!timeout || timeout > 2 * info->timeout)
2015 timeout = 2 * info->timeout;
2016
2017 spin_lock_irqsave(&info->slock, flags);
2018 while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2019 spin_unlock_irqrestore(&info->slock, flags);
2020 schedule_timeout_interruptible(char_time);
2021 spin_lock_irqsave(&info->slock, flags);
2022 if (signal_pending(current))
2023 break;
2024 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2025 break;
2026 }
2027 spin_unlock_irqrestore(&info->slock, flags);
2028 set_current_state(TASK_RUNNING);
2029}
2030
2031/*
2032 * This routine is called by tty_hangup() when a hangup is signaled.
2033 */
2034static void mxser_hangup(struct tty_struct *tty)
2035{
2036 struct mxser_port *info = tty->driver_data;
2037
2038 mxser_flush_buffer(tty);
2039 tty_port_hangup(&info->port);
2040}
2041
2042/*
2043 * mxser_rs_break() --- routine which turns the break handling on or off
2044 */
2045static int mxser_rs_break(struct tty_struct *tty, int break_state)
2046{
2047 struct mxser_port *info = tty->driver_data;
2048 unsigned long flags;
2049
2050 spin_lock_irqsave(&info->slock, flags);
2051 if (break_state == -1)
2052 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2053 info->ioaddr + UART_LCR);
2054 else
2055 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2056 info->ioaddr + UART_LCR);
2057 spin_unlock_irqrestore(&info->slock, flags);
2058 return 0;
2059}
2060
2061static void mxser_receive_chars(struct tty_struct *tty,
2062 struct mxser_port *port, int *status)
2063{
2064 unsigned char ch, gdl;
2065 int ignored = 0;
2066 int cnt = 0;
2067 int recv_room;
2068 int max = 256;
2069
2070 recv_room = tty->receive_room;
2071 if (recv_room == 0 && !port->ldisc_stop_rx)
2072 mxser_stoprx(tty);
2073 if (port->board->chip_flag != MOXA_OTHER_UART) {
2074
2075 if (*status & UART_LSR_SPECIAL)
2076 goto intr_old;
2077 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2078 (*status & MOXA_MUST_LSR_RERR))
2079 goto intr_old;
2080 if (*status & MOXA_MUST_LSR_RERR)
2081 goto intr_old;
2082
2083 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2084
2085 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2086 gdl &= MOXA_MUST_GDL_MASK;
2087 if (gdl >= recv_room) {
2088 if (!port->ldisc_stop_rx)
2089 mxser_stoprx(tty);
2090 }
2091 while (gdl--) {
2092 ch = inb(port->ioaddr + UART_RX);
2093 tty_insert_flip_char(&port->port, ch, 0);
2094 cnt++;
2095 }
2096 goto end_intr;
2097 }
2098intr_old:
2099
2100 do {
2101 if (max-- < 0)
2102 break;
2103
2104 ch = inb(port->ioaddr + UART_RX);
2105 if (port->board->chip_flag && (*status & UART_LSR_OE))
2106 outb(0x23, port->ioaddr + UART_FCR);
2107 *status &= port->read_status_mask;
2108 if (*status & port->ignore_status_mask) {
2109 if (++ignored > 100)
2110 break;
2111 } else {
2112 char flag = 0;
2113 if (*status & UART_LSR_SPECIAL) {
2114 if (*status & UART_LSR_BI) {
2115 flag = TTY_BREAK;
2116 port->icount.brk++;
2117
2118 if (port->port.flags & ASYNC_SAK)
2119 do_SAK(tty);
2120 } else if (*status & UART_LSR_PE) {
2121 flag = TTY_PARITY;
2122 port->icount.parity++;
2123 } else if (*status & UART_LSR_FE) {
2124 flag = TTY_FRAME;
2125 port->icount.frame++;
2126 } else if (*status & UART_LSR_OE) {
2127 flag = TTY_OVERRUN;
2128 port->icount.overrun++;
2129 } else
2130 flag = TTY_BREAK;
2131 }
2132 tty_insert_flip_char(&port->port, ch, flag);
2133 cnt++;
2134 if (cnt >= recv_room) {
2135 if (!port->ldisc_stop_rx)
2136 mxser_stoprx(tty);
2137 break;
2138 }
2139
2140 }
2141
2142 if (port->board->chip_flag)
2143 break;
2144
2145 *status = inb(port->ioaddr + UART_LSR);
2146 } while (*status & UART_LSR_DR);
2147
2148end_intr:
2149 mxvar_log.rxcnt[tty->index] += cnt;
2150 port->mon_data.rxcnt += cnt;
2151 port->mon_data.up_rxcnt += cnt;
2152
2153 /*
2154 * We are called from an interrupt context with &port->slock
2155 * being held. Drop it temporarily in order to prevent
2156 * recursive locking.
2157 */
2158 spin_unlock(&port->slock);
2159 tty_flip_buffer_push(&port->port);
2160 spin_lock(&port->slock);
2161}
2162
2163static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2164{
2165 int count, cnt;
2166
2167 if (port->x_char) {
2168 outb(port->x_char, port->ioaddr + UART_TX);
2169 port->x_char = 0;
2170 mxvar_log.txcnt[tty->index]++;
2171 port->mon_data.txcnt++;
2172 port->mon_data.up_txcnt++;
2173 port->icount.tx++;
2174 return;
2175 }
2176
2177 if (port->port.xmit_buf == NULL)
2178 return;
2179
2180 if (port->xmit_cnt <= 0 || tty->stopped ||
2181 (tty->hw_stopped &&
2182 (port->type != PORT_16550A) &&
2183 (!port->board->chip_flag))) {
2184 port->IER &= ~UART_IER_THRI;
2185 outb(port->IER, port->ioaddr + UART_IER);
2186 return;
2187 }
2188
2189 cnt = port->xmit_cnt;
2190 count = port->xmit_fifo_size;
2191 do {
2192 outb(port->port.xmit_buf[port->xmit_tail++],
2193 port->ioaddr + UART_TX);
2194 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2195 if (--port->xmit_cnt <= 0)
2196 break;
2197 } while (--count > 0);
2198 mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2199
2200 port->mon_data.txcnt += (cnt - port->xmit_cnt);
2201 port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2202 port->icount.tx += (cnt - port->xmit_cnt);
2203
2204 if (port->xmit_cnt < WAKEUP_CHARS)
2205 tty_wakeup(tty);
2206
2207 if (port->xmit_cnt <= 0) {
2208 port->IER &= ~UART_IER_THRI;
2209 outb(port->IER, port->ioaddr + UART_IER);
2210 }
2211}
2212
2213/*
2214 * This is the serial driver's generic interrupt routine
2215 */
2216static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2217{
2218 int status, iir, i;
2219 struct mxser_board *brd = NULL;
2220 struct mxser_port *port;
2221 int max, irqbits, bits, msr;
2222 unsigned int int_cnt, pass_counter = 0;
2223 int handled = IRQ_NONE;
2224 struct tty_struct *tty;
2225
2226 for (i = 0; i < MXSER_BOARDS; i++)
2227 if (dev_id == &mxser_boards[i]) {
2228 brd = dev_id;
2229 break;
2230 }
2231
2232 if (i == MXSER_BOARDS)
2233 goto irq_stop;
2234 if (brd == NULL)
2235 goto irq_stop;
2236 max = brd->info->nports;
2237 while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2238 irqbits = inb(brd->vector) & brd->vector_mask;
2239 if (irqbits == brd->vector_mask)
2240 break;
2241
2242 handled = IRQ_HANDLED;
2243 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2244 if (irqbits == brd->vector_mask)
2245 break;
2246 if (bits & irqbits)
2247 continue;
2248 port = &brd->ports[i];
2249
2250 int_cnt = 0;
2251 spin_lock(&port->slock);
2252 do {
2253 iir = inb(port->ioaddr + UART_IIR);
2254 if (iir & UART_IIR_NO_INT)
2255 break;
2256 iir &= MOXA_MUST_IIR_MASK;
2257 tty = tty_port_tty_get(&port->port);
2258 if (!tty ||
2259 (port->port.flags & ASYNC_CLOSING) ||
2260 !(port->port.flags &
2261 ASYNC_INITIALIZED)) {
2262 status = inb(port->ioaddr + UART_LSR);
2263 outb(0x27, port->ioaddr + UART_FCR);
2264 inb(port->ioaddr + UART_MSR);
2265 tty_kref_put(tty);
2266 break;
2267 }
2268
2269 status = inb(port->ioaddr + UART_LSR);
2270
2271 if (status & UART_LSR_PE)
2272 port->err_shadow |= NPPI_NOTIFY_PARITY;
2273 if (status & UART_LSR_FE)
2274 port->err_shadow |= NPPI_NOTIFY_FRAMING;
2275 if (status & UART_LSR_OE)
2276 port->err_shadow |=
2277 NPPI_NOTIFY_HW_OVERRUN;
2278 if (status & UART_LSR_BI)
2279 port->err_shadow |= NPPI_NOTIFY_BREAK;
2280
2281 if (port->board->chip_flag) {
2282 if (iir == MOXA_MUST_IIR_GDA ||
2283 iir == MOXA_MUST_IIR_RDA ||
2284 iir == MOXA_MUST_IIR_RTO ||
2285 iir == MOXA_MUST_IIR_LSR)
2286 mxser_receive_chars(tty, port,
2287 &status);
2288
2289 } else {
2290 status &= port->read_status_mask;
2291 if (status & UART_LSR_DR)
2292 mxser_receive_chars(tty, port,
2293 &status);
2294 }
2295 msr = inb(port->ioaddr + UART_MSR);
2296 if (msr & UART_MSR_ANY_DELTA)
2297 mxser_check_modem_status(tty, port, msr);
2298
2299 if (port->board->chip_flag) {
2300 if (iir == 0x02 && (status &
2301 UART_LSR_THRE))
2302 mxser_transmit_chars(tty, port);
2303 } else {
2304 if (status & UART_LSR_THRE)
2305 mxser_transmit_chars(tty, port);
2306 }
2307 tty_kref_put(tty);
2308 } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2309 spin_unlock(&port->slock);
2310 }
2311 }
2312
2313irq_stop:
2314 return handled;
2315}
2316
2317static const struct tty_operations mxser_ops = {
2318 .open = mxser_open,
2319 .close = mxser_close,
2320 .write = mxser_write,
2321 .put_char = mxser_put_char,
2322 .flush_chars = mxser_flush_chars,
2323 .write_room = mxser_write_room,
2324 .chars_in_buffer = mxser_chars_in_buffer,
2325 .flush_buffer = mxser_flush_buffer,
2326 .ioctl = mxser_ioctl,
2327 .throttle = mxser_throttle,
2328 .unthrottle = mxser_unthrottle,
2329 .set_termios = mxser_set_termios,
2330 .stop = mxser_stop,
2331 .start = mxser_start,
2332 .hangup = mxser_hangup,
2333 .break_ctl = mxser_rs_break,
2334 .wait_until_sent = mxser_wait_until_sent,
2335 .tiocmget = mxser_tiocmget,
2336 .tiocmset = mxser_tiocmset,
2337 .get_icount = mxser_get_icount,
2338};
2339
2340static struct tty_port_operations mxser_port_ops = {
2341 .carrier_raised = mxser_carrier_raised,
2342 .dtr_rts = mxser_dtr_rts,
2343 .activate = mxser_activate,
2344 .shutdown = mxser_shutdown_port,
2345};
2346
2347/*
2348 * The MOXA Smartio/Industio serial driver boot-time initialization code!
2349 */
2350
2351static bool allow_overlapping_vector;
2352module_param(allow_overlapping_vector, bool, S_IRUGO);
2353MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2354
2355static bool mxser_overlapping_vector(struct mxser_board *brd)
2356{
2357 return allow_overlapping_vector &&
2358 brd->vector >= brd->ports[0].ioaddr &&
2359 brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2360}
2361
2362static int mxser_request_vector(struct mxser_board *brd)
2363{
2364 if (mxser_overlapping_vector(brd))
2365 return 0;
2366 return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2367}
2368
2369static void mxser_release_vector(struct mxser_board *brd)
2370{
2371 if (mxser_overlapping_vector(brd))
2372 return;
2373 release_region(brd->vector, 1);
2374}
2375
2376static void mxser_release_ISA_res(struct mxser_board *brd)
2377{
2378 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2379 mxser_release_vector(brd);
2380}
2381
2382static int mxser_initbrd(struct mxser_board *brd,
2383 struct pci_dev *pdev)
2384{
2385 struct mxser_port *info;
2386 unsigned int i;
2387 int retval;
2388
2389 printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2390 brd->ports[0].max_baud);
2391
2392 for (i = 0; i < brd->info->nports; i++) {
2393 info = &brd->ports[i];
2394 tty_port_init(&info->port);
2395 info->port.ops = &mxser_port_ops;
2396 info->board = brd;
2397 info->stop_rx = 0;
2398 info->ldisc_stop_rx = 0;
2399
2400 /* Enhance mode enabled here */
2401 if (brd->chip_flag != MOXA_OTHER_UART)
2402 mxser_enable_must_enchance_mode(info->ioaddr);
2403
2404 info->port.flags = ASYNC_SHARE_IRQ;
2405 info->type = brd->uart_type;
2406
2407 process_txrx_fifo(info);
2408
2409 info->custom_divisor = info->baud_base * 16;
2410 info->port.close_delay = 5 * HZ / 10;
2411 info->port.closing_wait = 30 * HZ;
2412 info->normal_termios = mxvar_sdriver->init_termios;
2413 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2414 info->err_shadow = 0;
2415 spin_lock_init(&info->slock);
2416
2417 /* before set INT ISR, disable all int */
2418 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2419 info->ioaddr + UART_IER);
2420 }
2421
2422 retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2423 brd);
2424 if (retval) {
2425 for (i = 0; i < brd->info->nports; i++)
2426 tty_port_destroy(&brd->ports[i].port);
2427 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2428 "conflict with another device.\n",
2429 brd->info->name, brd->irq);
2430 }
2431
2432 return retval;
2433}
2434
2435static void mxser_board_remove(struct mxser_board *brd)
2436{
2437 unsigned int i;
2438
2439 for (i = 0; i < brd->info->nports; i++) {
2440 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2441 tty_port_destroy(&brd->ports[i].port);
2442 }
2443 free_irq(brd->irq, brd);
2444}
2445
2446static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2447{
2448 int id, i, bits, ret;
2449 unsigned short regs[16], irq;
2450 unsigned char scratch, scratch2;
2451
2452 brd->chip_flag = MOXA_OTHER_UART;
2453
2454 id = mxser_read_register(cap, regs);
2455 switch (id) {
2456 case C168_ASIC_ID:
2457 brd->info = &mxser_cards[0];
2458 break;
2459 case C104_ASIC_ID:
2460 brd->info = &mxser_cards[1];
2461 break;
2462 case CI104J_ASIC_ID:
2463 brd->info = &mxser_cards[2];
2464 break;
2465 case C102_ASIC_ID:
2466 brd->info = &mxser_cards[5];
2467 break;
2468 case CI132_ASIC_ID:
2469 brd->info = &mxser_cards[6];
2470 break;
2471 case CI134_ASIC_ID:
2472 brd->info = &mxser_cards[7];
2473 break;
2474 default:
2475 return 0;
2476 }
2477
2478 irq = 0;
2479 /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2480 Flag-hack checks if configuration should be read as 2-port here. */
2481 if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2482 irq = regs[9] & 0xF000;
2483 irq = irq | (irq >> 4);
2484 if (irq != (regs[9] & 0xFF00))
2485 goto err_irqconflict;
2486 } else if (brd->info->nports == 4) {
2487 irq = regs[9] & 0xF000;
2488 irq = irq | (irq >> 4);
2489 irq = irq | (irq >> 8);
2490 if (irq != regs[9])
2491 goto err_irqconflict;
2492 } else if (brd->info->nports == 8) {
2493 irq = regs[9] & 0xF000;
2494 irq = irq | (irq >> 4);
2495 irq = irq | (irq >> 8);
2496 if ((irq != regs[9]) || (irq != regs[10]))
2497 goto err_irqconflict;
2498 }
2499
2500 if (!irq) {
2501 printk(KERN_ERR "mxser: interrupt number unset\n");
2502 return -EIO;
2503 }
2504 brd->irq = ((int)(irq & 0xF000) >> 12);
2505 for (i = 0; i < 8; i++)
2506 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2507 if ((regs[12] & 0x80) == 0) {
2508 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2509 return -EIO;
2510 }
2511 brd->vector = (int)regs[11]; /* interrupt vector */
2512 if (id == 1)
2513 brd->vector_mask = 0x00FF;
2514 else
2515 brd->vector_mask = 0x000F;
2516 for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2517 if (regs[12] & bits) {
2518 brd->ports[i].baud_base = 921600;
2519 brd->ports[i].max_baud = 921600;
2520 } else {
2521 brd->ports[i].baud_base = 115200;
2522 brd->ports[i].max_baud = 115200;
2523 }
2524 }
2525 scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2526 outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2527 outb(0, cap + UART_EFR); /* EFR is the same as FCR */
2528 outb(scratch2, cap + UART_LCR);
2529 outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2530 scratch = inb(cap + UART_IIR);
2531
2532 if (scratch & 0xC0)
2533 brd->uart_type = PORT_16550A;
2534 else
2535 brd->uart_type = PORT_16450;
2536 if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2537 "mxser(IO)")) {
2538 printk(KERN_ERR "mxser: can't request ports I/O region: "
2539 "0x%.8lx-0x%.8lx\n",
2540 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2541 8 * brd->info->nports - 1);
2542 return -EIO;
2543 }
2544
2545 ret = mxser_request_vector(brd);
2546 if (ret) {
2547 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2548 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2549 "0x%.8lx-0x%.8lx\n",
2550 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2551 8 * brd->info->nports - 1);
2552 return ret;
2553 }
2554 return brd->info->nports;
2555
2556err_irqconflict:
2557 printk(KERN_ERR "mxser: invalid interrupt number\n");
2558 return -EIO;
2559}
2560
2561static int mxser_probe(struct pci_dev *pdev,
2562 const struct pci_device_id *ent)
2563{
2564#ifdef CONFIG_PCI
2565 struct mxser_board *brd;
2566 unsigned int i, j;
2567 unsigned long ioaddress;
2568 struct device *tty_dev;
2569 int retval = -EINVAL;
2570
2571 for (i = 0; i < MXSER_BOARDS; i++)
2572 if (mxser_boards[i].info == NULL)
2573 break;
2574
2575 if (i >= MXSER_BOARDS) {
2576 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2577 "not configured\n", MXSER_BOARDS);
2578 goto err;
2579 }
2580
2581 brd = &mxser_boards[i];
2582 brd->idx = i * MXSER_PORTS_PER_BOARD;
2583 dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2584 mxser_cards[ent->driver_data].name,
2585 pdev->bus->number, PCI_SLOT(pdev->devfn));
2586
2587 retval = pci_enable_device(pdev);
2588 if (retval) {
2589 dev_err(&pdev->dev, "PCI enable failed\n");
2590 goto err;
2591 }
2592
2593 /* io address */
2594 ioaddress = pci_resource_start(pdev, 2);
2595 retval = pci_request_region(pdev, 2, "mxser(IO)");
2596 if (retval)
2597 goto err_dis;
2598
2599 brd->info = &mxser_cards[ent->driver_data];
2600 for (i = 0; i < brd->info->nports; i++)
2601 brd->ports[i].ioaddr = ioaddress + 8 * i;
2602
2603 /* vector */
2604 ioaddress = pci_resource_start(pdev, 3);
2605 retval = pci_request_region(pdev, 3, "mxser(vector)");
2606 if (retval)
2607 goto err_zero;
2608 brd->vector = ioaddress;
2609
2610 /* irq */
2611 brd->irq = pdev->irq;
2612
2613 brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2614 brd->uart_type = PORT_16550A;
2615 brd->vector_mask = 0;
2616
2617 for (i = 0; i < brd->info->nports; i++) {
2618 for (j = 0; j < UART_INFO_NUM; j++) {
2619 if (Gpci_uart_info[j].type == brd->chip_flag) {
2620 brd->ports[i].max_baud =
2621 Gpci_uart_info[j].max_baud;
2622
2623 /* exception....CP-102 */
2624 if (brd->info->flags & MXSER_HIGHBAUD)
2625 brd->ports[i].max_baud = 921600;
2626 break;
2627 }
2628 }
2629 }
2630
2631 if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2632 for (i = 0; i < brd->info->nports; i++) {
2633 if (i < 4)
2634 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2635 else
2636 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2637 }
2638 outb(0, ioaddress + 4); /* default set to RS232 mode */
2639 outb(0, ioaddress + 0x0c); /* default set to RS232 mode */
2640 }
2641
2642 for (i = 0; i < brd->info->nports; i++) {
2643 brd->vector_mask |= (1 << i);
2644 brd->ports[i].baud_base = 921600;
2645 }
2646
2647 /* mxser_initbrd will hook ISR. */
2648 retval = mxser_initbrd(brd, pdev);
2649 if (retval)
2650 goto err_rel3;
2651
2652 for (i = 0; i < brd->info->nports; i++) {
2653 tty_dev = tty_port_register_device(&brd->ports[i].port,
2654 mxvar_sdriver, brd->idx + i, &pdev->dev);
2655 if (IS_ERR(tty_dev)) {
2656 retval = PTR_ERR(tty_dev);
2657 for (; i > 0; i--)
2658 tty_unregister_device(mxvar_sdriver,
2659 brd->idx + i - 1);
2660 goto err_relbrd;
2661 }
2662 }
2663
2664 pci_set_drvdata(pdev, brd);
2665
2666 return 0;
2667err_relbrd:
2668 for (i = 0; i < brd->info->nports; i++)
2669 tty_port_destroy(&brd->ports[i].port);
2670 free_irq(brd->irq, brd);
2671err_rel3:
2672 pci_release_region(pdev, 3);
2673err_zero:
2674 brd->info = NULL;
2675 pci_release_region(pdev, 2);
2676err_dis:
2677 pci_disable_device(pdev);
2678err:
2679 return retval;
2680#else
2681 return -ENODEV;
2682#endif
2683}
2684
2685static void mxser_remove(struct pci_dev *pdev)
2686{
2687#ifdef CONFIG_PCI
2688 struct mxser_board *brd = pci_get_drvdata(pdev);
2689
2690 mxser_board_remove(brd);
2691
2692 pci_release_region(pdev, 2);
2693 pci_release_region(pdev, 3);
2694 pci_disable_device(pdev);
2695 brd->info = NULL;
2696#endif
2697}
2698
2699static struct pci_driver mxser_driver = {
2700 .name = "mxser",
2701 .id_table = mxser_pcibrds,
2702 .probe = mxser_probe,
2703 .remove = mxser_remove
2704};
2705
2706static int __init mxser_module_init(void)
2707{
2708 struct mxser_board *brd;
2709 struct device *tty_dev;
2710 unsigned int b, i, m;
2711 int retval;
2712
2713 mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2714 if (!mxvar_sdriver)
2715 return -ENOMEM;
2716
2717 printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2718 MXSER_VERSION);
2719
2720 /* Initialize the tty_driver structure */
2721 mxvar_sdriver->name = "ttyMI";
2722 mxvar_sdriver->major = ttymajor;
2723 mxvar_sdriver->minor_start = 0;
2724 mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2725 mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2726 mxvar_sdriver->init_termios = tty_std_termios;
2727 mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2728 mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2729 tty_set_operations(mxvar_sdriver, &mxser_ops);
2730
2731 retval = tty_register_driver(mxvar_sdriver);
2732 if (retval) {
2733 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2734 "tty driver !\n");
2735 goto err_put;
2736 }
2737
2738 /* Start finding ISA boards here */
2739 for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2740 if (!ioaddr[b])
2741 continue;
2742
2743 brd = &mxser_boards[m];
2744 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2745 if (retval <= 0) {
2746 brd->info = NULL;
2747 continue;
2748 }
2749
2750 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2751 brd->info->name, ioaddr[b]);
2752
2753 /* mxser_initbrd will hook ISR. */
2754 if (mxser_initbrd(brd, NULL) < 0) {
2755 mxser_release_ISA_res(brd);
2756 brd->info = NULL;
2757 continue;
2758 }
2759
2760 brd->idx = m * MXSER_PORTS_PER_BOARD;
2761 for (i = 0; i < brd->info->nports; i++) {
2762 tty_dev = tty_port_register_device(&brd->ports[i].port,
2763 mxvar_sdriver, brd->idx + i, NULL);
2764 if (IS_ERR(tty_dev)) {
2765 for (; i > 0; i--)
2766 tty_unregister_device(mxvar_sdriver,
2767 brd->idx + i - 1);
2768 for (i = 0; i < brd->info->nports; i++)
2769 tty_port_destroy(&brd->ports[i].port);
2770 free_irq(brd->irq, brd);
2771 mxser_release_ISA_res(brd);
2772 brd->info = NULL;
2773 break;
2774 }
2775 }
2776 if (brd->info == NULL)
2777 continue;
2778
2779 m++;
2780 }
2781
2782 retval = pci_register_driver(&mxser_driver);
2783 if (retval) {
2784 printk(KERN_ERR "mxser: can't register pci driver\n");
2785 if (!m) {
2786 retval = -ENODEV;
2787 goto err_unr;
2788 } /* else: we have some ISA cards under control */
2789 }
2790
2791 return 0;
2792err_unr:
2793 tty_unregister_driver(mxvar_sdriver);
2794err_put:
2795 put_tty_driver(mxvar_sdriver);
2796 return retval;
2797}
2798
2799static void __exit mxser_module_exit(void)
2800{
2801 unsigned int i;
2802
2803 pci_unregister_driver(&mxser_driver);
2804
2805 for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2806 if (mxser_boards[i].info != NULL)
2807 mxser_board_remove(&mxser_boards[i]);
2808 tty_unregister_driver(mxvar_sdriver);
2809 put_tty_driver(mxvar_sdriver);
2810
2811 for (i = 0; i < MXSER_BOARDS; i++)
2812 if (mxser_boards[i].info != NULL)
2813 mxser_release_ISA_res(&mxser_boards[i]);
2814}
2815
2816module_init(mxser_module_init);
2817module_exit(mxser_module_exit);