1 /*****************************************************************************/
2 /*
3 * mxser.c -- MOXA Smartio family multiport serial driver.
4 *
5 * Copyright (C) 1999-2000 Moxa Technologies (support@moxa.com.tw).
6 *
7 * This code is loosely based on the Linux serial driver, written by
8 * Linus Torvalds, Theodore T'so and others.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25 /*
26 * MOXA Smartio Family Serial Driver
27 *
28 * Copyright (C) 1999,2000 Moxa Technologies Co., LTD.
29 *
30 * for : LINUX 2.0.X, 2.2.X
31 * date : 1999/07/22
32 * version : 1.1
33 *
34 */
35
36 #include <linux/config.h>
37 #include <linux/module.h>
38 #include <linux/version.h>
39 #include <linux/errno.h>
40 #include <linux/signal.h>
41 #include <linux/sched.h>
42 #include <linux/timer.h>
43 #include <linux/interrupt.h>
44 #include <linux/tty.h>
45 #include <linux/tty_flip.h>
46 #include <linux/serial.h>
47 #include <linux/serial_reg.h>
48 #include <linux/major.h>
49 #include <linux/string.h>
50 #include <linux/fcntl.h>
51 #include <linux/ptrace.h>
52 #include <linux/ioport.h>
53 #include <linux/mm.h>
54 #include <linux/smp_lock.h>
55 #include <linux/pci.h>
56
57 #include <asm/system.h>
58 #include <asm/io.h>
59 #include <asm/irq.h>
60 #include <asm/segment.h>
61 #include <asm/bitops.h>
62 #include <asm/uaccess.h>
63
64 #define MXSER_VERSION "1.1kern"
65
66 #define MXSERMAJOR 174
67 #define MXSERCUMAJOR 175
68
69
70 #define MXSER_EVENT_TXLOW 1
71 #define MXSER_EVENT_HANGUP 2
72
73
74 #define SERIAL_DO_RESTART
75
76 #define MXSER_BOARDS 4 /* Max. boards */
77 #define MXSER_PORTS 32 /* Max. ports */
78 #define MXSER_PORTS_PER_BOARD 8 /* Max. ports per board */
79 #define MXSER_ISR_PASS_LIMIT 256
80
81 #define MXSER_ERR_IOADDR -1
82 #define MXSER_ERR_IRQ -2
83 #define MXSER_ERR_IRQ_CONFLIT -3
84 #define MXSER_ERR_VECTOR -4
85
86 #define SERIAL_TYPE_NORMAL 1
87 #define SERIAL_TYPE_CALLOUT 2
88
89 #define WAKEUP_CHARS 256
90
91 #define UART_MCR_AFE 0x20
92 #define UART_LSR_SPECIAL 0x1E
93
94 #define PORTNO(x) (MINOR((x)->device) - (x)->driver.minor_start)
95
96 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
97
98 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
99
100 #ifndef MIN
101 #define MIN(a,b) ((a) < (b) ? (a) : (b))
102 #endif
103
104 /*
105 * Define the Moxa PCI vendor and device IDs.
106 */
107
108 #ifndef PCI_VENDOR_ID_MOXA
109 #define PCI_VENDOR_ID_MOXA 0x1393
110 #endif
111 #ifndef PCI_DEVICE_ID_C168
112 #define PCI_DEVICE_ID_C168 0x1680
113 #endif
114 #ifndef PCI_DEVICE_ID_C104
115 #define PCI_DEVICE_ID_C104 0x1040
116 #endif
117
118 #define C168_ASIC_ID 1
119 #define C104_ASIC_ID 2
120 #define CI104J_ASIC_ID 5
121
122 enum {
123 MXSER_BOARD_C168_ISA = 0,
124 MXSER_BOARD_C104_ISA,
125 MXSER_BOARD_CI104J,
126 MXSER_BOARD_C168_PCI,
127 MXSER_BOARD_C104_PCI,
128 };
129
130 static char *mxser_brdname[] =
131 {
132 "C168 series",
133 "C104 series",
134 "CI-104J series",
135 "C168H/PCI series",
136 "C104H/PCI series",
137 };
138
139 static int mxser_numports[] =
140 {
141 8,
142 4,
143 4,
144 8,
145 4,
146 };
147
148 /*
149 * MOXA ioctls
150 */
151 #define MOXA 0x400
152 #define MOXA_GETDATACOUNT (MOXA + 23)
153 #define MOXA_GET_CONF (MOXA + 35)
154 #define MOXA_DIAGNOSE (MOXA + 50)
155 #define MOXA_CHKPORTENABLE (MOXA + 60)
156 #define MOXA_HighSpeedOn (MOXA + 61)
157 #define MOXA_GET_MAJOR (MOXA + 63)
158 #define MOXA_GET_CUMAJOR (MOXA + 64)
159 #define MOXA_GETMSTATUS (MOXA + 65)
160
161 typedef struct {
162 unsigned short vendor_id;
163 unsigned short device_id;
164 unsigned short board_type;
165 } mxser_pciinfo;
166
167 static mxser_pciinfo mxser_pcibrds[] =
168 {
169 {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_C168, MXSER_BOARD_C168_PCI},
170 {PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_C104, MXSER_BOARD_C104_PCI},
171 };
172
173 static int ioaddr[MXSER_BOARDS];
174 static int ttymajor = MXSERMAJOR;
175 static int calloutmajor = MXSERCUMAJOR;
176 static int verbose;
177
178 /* Variables for insmod */
179
180 MODULE_AUTHOR("William Chen");
181 MODULE_DESCRIPTION("MOXA Smartio Family Multiport Board Device Driver");
182 MODULE_PARM(ioaddr, "1-4i");
183 MODULE_PARM(ttymajor, "i");
184 MODULE_PARM(calloutmajor, "i");
185 MODULE_PARM(verbose, "i");
186
187 struct mxser_hwconf {
188 int board_type;
189 int ports;
190 int irq;
191 int vector;
192 int vector_mask;
193 int uart_type;
194 int ioaddr[MXSER_PORTS_PER_BOARD];
195 int baud_base[MXSER_PORTS_PER_BOARD];
196 struct pci_dev *pdev;
197 };
198
199 struct mxser_struct {
200 int port;
201 int base; /* port base address */
202 int irq; /* port using irq no. */
203 int vector; /* port irq vector */
204 int vectormask; /* port vector mask */
205 int rx_trigger; /* Rx fifo trigger level */
206 int baud_base; /* max. speed */
207 int flags; /* defined in tty.h */
208 int type; /* UART type */
209 struct tty_struct *tty;
210 int read_status_mask;
211 int ignore_status_mask;
212 int xmit_fifo_size;
213 int custom_divisor;
214 int x_char; /* xon/xoff character */
215 int close_delay;
216 unsigned short closing_wait;
217 int IER; /* Interrupt Enable Register */
218 int MCR; /* Modem control register */
219 unsigned long event;
220 int count; /* # of fd on device */
221 int blocked_open; /* # of blocked opens */
222 long session; /* Session of opening process */
223 long pgrp; /* pgrp of opening process */
224 unsigned char *xmit_buf;
225 int xmit_head;
226 int xmit_tail;
227 int xmit_cnt;
228 struct tq_struct tqueue;
229 struct termios normal_termios;
230 struct termios callout_termios;
231 wait_queue_head_t open_wait;
232 wait_queue_head_t close_wait;
233 wait_queue_head_t delta_msr_wait;
234 struct async_icount icount; /* kernel counters for the 4 input interrupts */
235 };
236
237 struct mxser_log {
238 int tick;
239 int rxcnt[MXSER_PORTS];
240 int txcnt[MXSER_PORTS];
241 };
242
243 struct mxser_mstatus {
244 tcflag_t cflag;
245 int cts;
246 int dsr;
247 int ri;
248 int dcd;
249 };
250
251 static struct mxser_mstatus GMStatus[MXSER_PORTS];
252
253 static int mxserBoardCAP[MXSER_BOARDS] =
254 {
255 0, 0, 0, 0
256 /* 0x180, 0x280, 0x200, 0x320 */
257 };
258
259
260 static struct tty_driver mxvar_sdriver, mxvar_cdriver;
261 static int mxvar_refcount;
262 static struct mxser_struct mxvar_table[MXSER_PORTS];
263 static struct tty_struct *mxvar_tty[MXSER_PORTS + 1];
264 static struct termios *mxvar_termios[MXSER_PORTS + 1];
265 static struct termios *mxvar_termios_locked[MXSER_PORTS + 1];
266 static struct mxser_log mxvar_log;
267 static int mxvar_diagflag;
268 /*
269 * mxvar_tmp_buf is used as a temporary buffer by serial_write. We need
270 * to lock it in case the memcpy_fromfs blocks while swapping in a page,
271 * and some other program tries to do a serial write at the same time.
272 * Since the lock will only come under contention when the system is
273 * swapping and available memory is low, it makes sense to share one
274 * buffer across all the serial ports, since it significantly saves
275 * memory if large numbers of serial ports are open.
276 */
277 static unsigned char *mxvar_tmp_buf;
278 static struct semaphore mxvar_tmp_buf_sem;
279
280 /*
281 * This is used to figure out the divisor speeds and the timeouts
282 */
283 static int mxvar_baud_table[] =
284 {
285 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
286 9600, 19200, 38400, 57600, 115200, 230400, 460800, 921600, 0};
287
288 struct mxser_hwconf mxsercfg[MXSER_BOARDS];
289
290 /*
291 * static functions:
292 */
293
294 #ifdef MODULE
295 int init_module(void);
296 void cleanup_module(void);
297 #endif
298
299 static void mxser_getcfg(int board, struct mxser_hwconf *hwconf);
300 int mxser_init(void);
301 static int mxser_get_ISA_conf(int, struct mxser_hwconf *);
302 static int mxser_get_PCI_conf(struct pci_dev *, int, struct mxser_hwconf *);
303 static void mxser_do_softint(void *);
304 static int mxser_open(struct tty_struct *, struct file *);
305 static void mxser_close(struct tty_struct *, struct file *);
306 static int mxser_write(struct tty_struct *, int, const unsigned char *, int);
307 static int mxser_write_room(struct tty_struct *);
308 static void mxser_flush_buffer(struct tty_struct *);
309 static int mxser_chars_in_buffer(struct tty_struct *);
310 static void mxser_flush_chars(struct tty_struct *);
311 static void mxser_put_char(struct tty_struct *, unsigned char);
312 static int mxser_ioctl(struct tty_struct *, struct file *, uint, ulong);
313 static int mxser_ioctl_special(unsigned int, unsigned long);
314 static void mxser_throttle(struct tty_struct *);
315 static void mxser_unthrottle(struct tty_struct *);
316 static void mxser_set_termios(struct tty_struct *, struct termios *);
317 static void mxser_stop(struct tty_struct *);
318 static void mxser_start(struct tty_struct *);
319 static void mxser_hangup(struct tty_struct *);
320 static void mxser_interrupt(int, void *, struct pt_regs *);
321 static inline void mxser_receive_chars(struct mxser_struct *, int *);
322 static inline void mxser_transmit_chars(struct mxser_struct *);
323 static inline void mxser_check_modem_status(struct mxser_struct *, int);
324 static int mxser_block_til_ready(struct tty_struct *, struct file *, struct mxser_struct *);
325 static int mxser_startup(struct mxser_struct *);
326 static void mxser_shutdown(struct mxser_struct *);
327 static int mxser_change_speed(struct mxser_struct *, struct termios *old_termios);
328 static int mxser_get_serial_info(struct mxser_struct *, struct serial_struct *);
329 static int mxser_set_serial_info(struct mxser_struct *, struct serial_struct *);
330 static int mxser_get_lsr_info(struct mxser_struct *, unsigned int *);
331 static void mxser_send_break(struct mxser_struct *, int);
332 static int mxser_get_modem_info(struct mxser_struct *, unsigned int *);
333 static int mxser_set_modem_info(struct mxser_struct *, unsigned int, unsigned int *);
334
335 /*
336 * The MOXA C168/C104 serial driver boot-time initialization code!
337 */
338
339
340 #ifdef MODULE
341 int init_module(void)
342 {
343 int ret;
344
345 if (verbose)
346 printk("Loading module mxser ...\n");
347 ret = mxser_init();
348 if (verbose)
349 printk("Done.\n");
350 return (ret);
351 }
352
353 void cleanup_module(void)
354 {
355 int i, err = 0;
356
357
358 if (verbose)
359 printk("Unloading module mxser ...\n");
360 if ((err |= tty_unregister_driver(&mxvar_cdriver)))
361 printk("Couldn't unregister MOXA Smartio family callout driver\n");
362 if ((err |= tty_unregister_driver(&mxvar_sdriver)))
363 printk("Couldn't unregister MOXA Smartio family serial driver\n");
364
365 for (i = 0; i < MXSER_BOARDS; i++) {
366 if (mxsercfg[i].board_type == -1)
367 continue;
368 else {
369 free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]);
370 }
371 }
372
373 if (verbose)
374 printk("Done.\n");
375
376 }
377 #endif
378
379
380 int mxser_initbrd(int board, struct mxser_hwconf *hwconf)
381 {
382 struct mxser_struct *info;
383 unsigned long flags;
384 int retval;
385 int i, n;
386
387 init_MUTEX(&mxvar_tmp_buf_sem);
388
389 n = board * MXSER_PORTS_PER_BOARD;
390 info = &mxvar_table[n];
391 for (i = 0; i < hwconf->ports; i++, n++, info++) {
392 if (verbose) {
393 printk(" ttyM%d/cum%d at 0x%04x ", n, n, hwconf->ioaddr[i]);
394 if (hwconf->baud_base[i] == 115200)
395 printk(" max. baud rate up to 115200 bps.\n");
396 else
397 printk(" max. baud rate up to 921600 bps.\n");
398 }
399 info->port = n;
400 info->base = hwconf->ioaddr[i];
401 info->irq = hwconf->irq;
402 info->vector = hwconf->vector;
403 info->vectormask = hwconf->vector_mask;
404 info->rx_trigger = 14;
405 info->baud_base = hwconf->baud_base[i];
406 info->flags = ASYNC_SHARE_IRQ;
407 info->type = hwconf->uart_type;
408 if ((info->type == PORT_16450) || (info->type == PORT_8250))
409 info->xmit_fifo_size = 1;
410 else
411 info->xmit_fifo_size = 16;
412 info->custom_divisor = hwconf->baud_base[i] * 16;
413 info->close_delay = 5 * HZ / 10;
414 info->closing_wait = 30 * HZ;
415 info->tqueue.routine = mxser_do_softint;
416 info->tqueue.data = info;
417 info->callout_termios = mxvar_cdriver.init_termios;
418 info->normal_termios = mxvar_sdriver.init_termios;
419 init_waitqueue_head(&info->open_wait);
420 init_waitqueue_head(&info->close_wait);
421 init_waitqueue_head(&info->delta_msr_wait);
422 }
423
424 /*
425 * Allocate the IRQ if necessary
426 */
427 save_flags(flags);
428
429 n = board * MXSER_PORTS_PER_BOARD;
430 info = &mxvar_table[n];
431
432 cli();
433 retval = request_irq(hwconf->irq, mxser_interrupt, IRQ_T(info),
434 "mxser", info);
435 if (retval) {
436 restore_flags(flags);
437 printk("Board %d: %s", board, mxser_brdname[hwconf->board_type - 1]);
438 printk(" Request irq fail,IRQ (%d) may be conflit with another device.\n", info->irq);
439 return (retval);
440 }
441 restore_flags(flags);
442
443 return 0;
444 }
445
446
447 static void mxser_getcfg(int board, struct mxser_hwconf *hwconf)
448 {
449 mxsercfg[board] = *hwconf;
450 }
451
452 static int mxser_get_PCI_conf(struct pci_dev *pdev, int board_type, struct mxser_hwconf *hwconf)
453 {
454 int i;
455 unsigned int ioaddress;
456
457 hwconf->board_type = board_type;
458 hwconf->ports = mxser_numports[board_type - 1];
459 ioaddress = pci_resource_start (pdev, 2);
460 for (i = 0; i < hwconf->ports; i++)
461 hwconf->ioaddr[i] = ioaddress + 8 * i;
462
463 ioaddress = pci_resource_start (pdev, 3);
464 hwconf->vector = ioaddress;
465
466 hwconf->irq = pdev->irq;
467
468 hwconf->uart_type = PORT_16550A;
469 hwconf->vector_mask = 0;
470 for (i = 0; i < hwconf->ports; i++) {
471 hwconf->vector_mask |= (1 << i);
472 hwconf->baud_base[i] = 921600;
473 }
474 return (0);
475 }
476
477 int mxser_init(void)
478 {
479 int i, m, retval, b;
480 int n, index;
481 int ret1, ret2;
482 struct mxser_hwconf hwconf;
483
484 printk("MOXA Smartio family driver version %s\n", MXSER_VERSION);
485
486 /* Initialize the tty_driver structure */
487
488 memset(&mxvar_sdriver, 0, sizeof(struct tty_driver));
489 mxvar_sdriver.magic = TTY_DRIVER_MAGIC;
490 mxvar_sdriver.name = "ttyM";
491 mxvar_sdriver.major = ttymajor;
492 mxvar_sdriver.minor_start = 0;
493 mxvar_sdriver.num = MXSER_PORTS + 1;
494 mxvar_sdriver.type = TTY_DRIVER_TYPE_SERIAL;
495 mxvar_sdriver.subtype = SERIAL_TYPE_NORMAL;
496 mxvar_sdriver.init_termios = tty_std_termios;
497 mxvar_sdriver.init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
498 mxvar_sdriver.flags = TTY_DRIVER_REAL_RAW;
499 mxvar_sdriver.refcount = &mxvar_refcount;
500 mxvar_sdriver.table = mxvar_tty;
501 mxvar_sdriver.termios = mxvar_termios;
502 mxvar_sdriver.termios_locked = mxvar_termios_locked;
503
504 mxvar_sdriver.open = mxser_open;
505 mxvar_sdriver.close = mxser_close;
506 mxvar_sdriver.write = mxser_write;
507 mxvar_sdriver.put_char = mxser_put_char;
508 mxvar_sdriver.flush_chars = mxser_flush_chars;
509 mxvar_sdriver.write_room = mxser_write_room;
510 mxvar_sdriver.chars_in_buffer = mxser_chars_in_buffer;
511 mxvar_sdriver.flush_buffer = mxser_flush_buffer;
512 mxvar_sdriver.ioctl = mxser_ioctl;
513 mxvar_sdriver.throttle = mxser_throttle;
514 mxvar_sdriver.unthrottle = mxser_unthrottle;
515 mxvar_sdriver.set_termios = mxser_set_termios;
516 mxvar_sdriver.stop = mxser_stop;
517 mxvar_sdriver.start = mxser_start;
518 mxvar_sdriver.hangup = mxser_hangup;
519
520 /*
521 * The callout device is just like normal device except for
522 * major number and the subtype code.
523 */
524 mxvar_cdriver = mxvar_sdriver;
525 mxvar_cdriver.name = "cum";
526 mxvar_cdriver.major = calloutmajor;
527 mxvar_cdriver.subtype = SERIAL_TYPE_CALLOUT;
528
529 printk("Tty devices major number = %d, callout devices major number = %d\n", ttymajor, calloutmajor);
530
531 mxvar_diagflag = 0;
532 memset(mxvar_table, 0, MXSER_PORTS * sizeof(struct mxser_struct));
533 memset(&mxvar_log, 0, sizeof(struct mxser_log));
534
535
536 m = 0;
537 /* Start finding ISA boards here */
538 for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
539 int cap;
540 if (!(cap = mxserBoardCAP[b]))
541 continue;
542
543 retval = mxser_get_ISA_conf(cap, &hwconf);
544
545 if (retval != 0)
546 printk("Found MOXA %s board (CAP=0x%x)\n",
547 mxser_brdname[hwconf.board_type - 1],
548 ioaddr[b]);
549
550 if (retval <= 0) {
551 if (retval == MXSER_ERR_IRQ)
552 printk("Invalid interrupt number,board not configured\n");
553 else if (retval == MXSER_ERR_IRQ_CONFLIT)
554 printk("Invalid interrupt number,board not configured\n");
555 else if (retval == MXSER_ERR_VECTOR)
556 printk("Invalid interrupt vector,board not configured\n");
557 else if (retval == MXSER_ERR_IOADDR)
558 printk("Invalid I/O address,board not configured\n");
559
560 continue;
561 }
562 hwconf.pdev = NULL;
563
564 if (mxser_initbrd(m, &hwconf) < 0)
565 continue;
566
567 mxser_getcfg(m, &hwconf);
568
569 m++;
570 }
571
572 /* Start finding ISA boards from module arg */
573 for (b = 0; b < MXSER_BOARDS && m < MXSER_BOARDS; b++) {
574 int cap;
575 if (!(cap = ioaddr[b]))
576 continue;
577
578 retval = mxser_get_ISA_conf(cap, &hwconf);
579
580 if (retval != 0)
581 printk("Found MOXA %s board (CAP=0x%x)\n",
582 mxser_brdname[hwconf.board_type - 1],
583 ioaddr[b]);
584
585 if (retval <= 0) {
586 if (retval == MXSER_ERR_IRQ)
587 printk("Invalid interrupt number,board not configured\n");
588 else if (retval == MXSER_ERR_IRQ_CONFLIT)
589 printk("Invalid interrupt number,board not configured\n");
590 else if (retval == MXSER_ERR_VECTOR)
591 printk("Invalid interrupt vector,board not configured\n");
592 else if (retval == MXSER_ERR_IOADDR)
593 printk("Invalid I/O address,board not configured\n");
594
595 continue;
596 }
597 hwconf.pdev = NULL;
598
599 if (mxser_initbrd(m, &hwconf) < 0)
600 continue;
601
602 mxser_getcfg(m, &hwconf);
603
604 m++;
605 }
606
607 /* start finding PCI board here */
608
609 #ifdef CONFIG_PCI
610 {
611 struct pci_dev *pdev = NULL;
612
613 n = sizeof(mxser_pcibrds) / sizeof(mxser_pciinfo);
614 index = 0;
615 b = 0;
616 while (b < n) {
617 pdev = pci_find_device(mxser_pcibrds[b].vendor_id,
618 mxser_pcibrds[b].device_id, pdev);
619 if (!pdev)
620 break;
621 if (pci_enable_device(pdev))
622 continue;
623 b++;
624 hwconf.pdev = pdev;
625 printk("Found MOXA %s board(BusNo=%d,DevNo=%d)\n",
626 mxser_brdname[mxser_pcibrds[b].board_type - 1],
627 pdev->bus->number, PCI_SLOT(pdev->devfn >> 3));
628 if (m >= MXSER_BOARDS) {
629 printk("Too many Smartio family boards find (maximum %d),board not configured\n", MXSER_BOARDS);
630 } else {
631 retval = mxser_get_PCI_conf(pdev,
632 mxser_pcibrds[b].board_type, &hwconf);
633 if (retval < 0) {
634 if (retval == MXSER_ERR_IRQ)
635 printk("Invalid interrupt number,board not configured\n");
636 else if (retval == MXSER_ERR_IRQ_CONFLIT)
637 printk("Invalid interrupt number,board not configured\n");
638 else if (retval == MXSER_ERR_VECTOR)
639 printk("Invalid interrupt vector,board not configured\n");
640 else if (retval == MXSER_ERR_IOADDR)
641 printk("Invalid I/O address,board not configured\n");
642 continue;
643
644 }
645 if (mxser_initbrd(m, &hwconf) < 0)
646 continue;
647 mxser_getcfg(m, &hwconf);
648 m++;
649
650 }
651
652 }
653 }
654 #endif
655
656 for (i = m; i < MXSER_BOARDS; i++) {
657 mxsercfg[i].board_type = -1;
658 }
659
660
661 ret1 = 0;
662 ret2 = 0;
663 if (!(ret1 = tty_register_driver(&mxvar_sdriver))) {
664 if (!(ret2 = tty_register_driver(&mxvar_cdriver))) {
665 return 0;
666 } else {
667 tty_unregister_driver(&mxvar_sdriver);
668 printk("Couldn't install MOXA Smartio family callout driver !\n");
669 }
670 } else
671 printk("Couldn't install MOXA Smartio family driver !\n");
672
673
674 if (ret1 || ret2) {
675 for (i = 0; i < MXSER_BOARDS; i++) {
676 if (mxsercfg[i].board_type == -1)
677 continue;
678 else {
679 free_irq(mxsercfg[i].irq, &mxvar_table[i * MXSER_PORTS_PER_BOARD]);
680 }
681 }
682 return -1;
683 }
684 return (0);
685 }
686
687 static void mxser_do_softint(void *private_)
688 {
689 struct mxser_struct *info = (struct mxser_struct *) private_;
690 struct tty_struct *tty;
691
692 tty = info->tty;
693 if (tty) {
694 if (test_and_clear_bit(MXSER_EVENT_TXLOW, &info->event)) {
695 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
696 tty->ldisc.write_wakeup)
697 (tty->ldisc.write_wakeup) (tty);
698 wake_up_interruptible(&tty->write_wait);
699 }
700 if (test_and_clear_bit(MXSER_EVENT_HANGUP, &info->event)) {
701 tty_hangup(tty); /* FIXME: module removal race here - AKPM */
702 }
703 }
704 MOD_DEC_USE_COUNT;
705 }
706
707 /*
708 * This routine is called whenever a serial port is opened. It
709 * enables interrupts for a serial port, linking in its async structure into
710 * the IRQ chain. It also performs the serial-specific
711 * initialization for the tty structure.
712 */
713
714 static int mxser_open(struct tty_struct *tty, struct file *filp)
715 {
716 struct mxser_struct *info;
717 int retval, line;
718 unsigned long page;
719
720 line = PORTNO(tty);
721 if (line == MXSER_PORTS)
722 return (0);
723 if ((line < 0) || (line > MXSER_PORTS))
724 return (-ENODEV);
725 info = mxvar_table + line;
726 if (!info->base)
727 return (-ENODEV);
728
729 info->count++;
730 tty->driver_data = info;
731 info->tty = tty;
732
733 if (!mxvar_tmp_buf) {
734 page = get_free_page(GFP_KERNEL);
735 if (!page)
736 return (-ENOMEM);
737 if (mxvar_tmp_buf)
738 free_page(page);
739 else
740 mxvar_tmp_buf = (unsigned char *) page;
741 }
742 /*
743 * Start up serial port
744 */
745 retval = mxser_startup(info);
746 if (retval)
747 return (retval);
748
749 retval = mxser_block_til_ready(tty, filp, info);
750 if (retval)
751 return (retval);
752
753 if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
754 if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
755 *tty->termios = info->normal_termios;
756 else
757 *tty->termios = info->callout_termios;
758 mxser_change_speed(info, 0);
759 }
760 info->session = current->session;
761 info->pgrp = current->pgrp;
762
763 MOD_INC_USE_COUNT;
764
765 return (0);
766 }
767
768 /*
769 * This routine is called when the serial port gets closed. First, we
770 * wait for the last remaining data to be sent. Then, we unlink its
771 * async structure from the interrupt chain if necessary, and we free
772 * that IRQ if nothing is left in the chain.
773 */
774
775 static void mxser_close(struct tty_struct *tty, struct file *filp)
776 {
777 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
778 unsigned long flags;
779 unsigned long timeout;
780
781 if (PORTNO(tty) == MXSER_PORTS)
782 return;
783 if (!info)
784 return;
785
786 save_flags(flags);
787 cli();
788
789 if (tty_hung_up_p(filp)) {
790 restore_flags(flags);
791 MOD_DEC_USE_COUNT;
792 return;
793 }
794 if ((tty->count == 1) && (info->count != 1)) {
795 /*
796 * Uh, oh. tty->count is 1, which means that the tty
797 * structure will be freed. Info->count should always
798 * be one in these conditions. If it's greater than
799 * one, we've got real problems, since it means the
800 * serial port won't be shutdown.
801 */
802 printk("mxser_close: bad serial port count; tty->count is 1, "
803 "info->count is %d\n", info->count);
804 info->count = 1;
805 }
806 if (--info->count < 0) {
807 printk("mxser_close: bad serial port count for ttys%d: %d\n",
808 info->port, info->count);
809 info->count = 0;
810 }
811 if (info->count) {
812 restore_flags(flags);
813 MOD_DEC_USE_COUNT;
814 return;
815 }
816 info->flags |= ASYNC_CLOSING;
817 /*
818 * Save the termios structure, since this port may have
819 * separate termios for callout and dialin.
820 */
821 if (info->flags & ASYNC_NORMAL_ACTIVE)
822 info->normal_termios = *tty->termios;
823 if (info->flags & ASYNC_CALLOUT_ACTIVE)
824 info->callout_termios = *tty->termios;
825 /*
826 * Now we wait for the transmit buffer to clear; and we notify
827 * the line discipline to only process XON/XOFF characters.
828 */
829 tty->closing = 1;
830 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
831 tty_wait_until_sent(tty, info->closing_wait);
832 /*
833 * At this point we stop accepting input. To do this, we
834 * disable the receive line status interrupts, and tell the
835 * interrupt driver to stop checking the data ready bit in the
836 * line status register.
837 */
838 info->IER &= ~UART_IER_RLSI;
839 /* by William
840 info->read_status_mask &= ~UART_LSR_DR;
841 */
842 if (info->flags & ASYNC_INITIALIZED) {
843 outb(info->IER, info->base + UART_IER);
844 /*
845 * Before we drop DTR, make sure the UART transmitter
846 * has completely drained; this is especially
847 * important if there is a transmit FIFO!
848 */
849 timeout = jiffies + HZ;
850 while (!(inb(info->base + UART_LSR) & UART_LSR_TEMT)) {
851 current->state = TASK_INTERRUPTIBLE;
852 schedule_timeout(5);
853 if (jiffies > timeout)
854 break;
855 }
856 }
857 mxser_shutdown(info);
858 if (tty->driver.flush_buffer)
859 tty->driver.flush_buffer(tty);
860 if (tty->ldisc.flush_buffer)
861 tty->ldisc.flush_buffer(tty);
862 tty->closing = 0;
863 info->event = 0;
864 info->tty = 0;
865 if (info->blocked_open) {
866 if (info->close_delay) {
867 current->state = TASK_INTERRUPTIBLE;
868 schedule_timeout(info->close_delay);
869 }
870 wake_up_interruptible(&info->open_wait);
871 }
872 info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CALLOUT_ACTIVE |
873 ASYNC_CLOSING);
874 wake_up_interruptible(&info->close_wait);
875 restore_flags(flags);
876
877 MOD_DEC_USE_COUNT;
878 }
879
880 static int mxser_write(struct tty_struct *tty, int from_user,
881 const unsigned char *buf, int count)
882 {
883 int c, total = 0;
884 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
885 unsigned long flags;
886
887 if (!tty || !info->xmit_buf || !mxvar_tmp_buf)
888 return (0);
889
890 if (from_user)
891 down(&mxvar_tmp_buf_sem);
892 save_flags(flags);
893 while (1) {
894 cli();
895 c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
896 SERIAL_XMIT_SIZE - info->xmit_head));
897 if (c <= 0)
898 break;
899
900 if (from_user) {
901 copy_from_user(mxvar_tmp_buf, buf, c);
902 c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
903 SERIAL_XMIT_SIZE - info->xmit_head));
904 memcpy(info->xmit_buf + info->xmit_head, mxvar_tmp_buf, c);
905 } else
906 memcpy(info->xmit_buf + info->xmit_head, buf, c);
907 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE - 1);
908 info->xmit_cnt += c;
909 restore_flags(flags);
910 buf += c;
911 count -= c;
912 total += c;
913 }
914 if (from_user)
915 up(&mxvar_tmp_buf_sem);
916 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
917 !(info->IER & UART_IER_THRI)) {
918 info->IER |= UART_IER_THRI;
919 outb(info->IER, info->base + UART_IER);
920 }
921 restore_flags(flags);
922 return (total);
923 }
924
925 static void mxser_put_char(struct tty_struct *tty, unsigned char ch)
926 {
927 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
928 unsigned long flags;
929
930 if (!tty || !info->xmit_buf)
931 return;
932
933 save_flags(flags);
934 cli();
935 if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
936 restore_flags(flags);
937 return;
938 }
939 info->xmit_buf[info->xmit_head++] = ch;
940 info->xmit_head &= SERIAL_XMIT_SIZE - 1;
941 info->xmit_cnt++;
942 /********************************************** why ??? ***********
943 if ( !tty->stopped && !tty->hw_stopped &&
944 !(info->IER & UART_IER_THRI) ) {
945 info->IER |= UART_IER_THRI;
946 outb(info->IER, info->base + UART_IER);
947 }
948 *****************************************************************/
949 restore_flags(flags);
950 }
951
952 static void mxser_flush_chars(struct tty_struct *tty)
953 {
954 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
955 unsigned long flags;
956
957 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
958 !info->xmit_buf)
959 return;
960
961 save_flags(flags);
962 cli();
963 info->IER |= UART_IER_THRI;
964 outb(info->IER, info->base + UART_IER);
965 restore_flags(flags);
966 }
967
968 static int mxser_write_room(struct tty_struct *tty)
969 {
970 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
971 int ret;
972
973 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
974 if (ret < 0)
975 ret = 0;
976 return (ret);
977 }
978
979 static int mxser_chars_in_buffer(struct tty_struct *tty)
980 {
981 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
982
983 return (info->xmit_cnt);
984 }
985
986 static void mxser_flush_buffer(struct tty_struct *tty)
987 {
988 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
989 unsigned long flags;
990
991 save_flags(flags);
992 cli();
993 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
994 restore_flags(flags);
995 wake_up_interruptible(&tty->write_wait);
996 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
997 tty->ldisc.write_wakeup)
998 (tty->ldisc.write_wakeup) (tty);
999 }
1000
1001 static int mxser_ioctl(struct tty_struct *tty, struct file *file,
1002 unsigned int cmd, unsigned long arg)
1003 {
1004 unsigned long flags;
1005 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
1006 int retval;
1007 struct async_icount cprev, cnow; /* kernel counter temps */
1008 struct serial_icounter_struct *p_cuser; /* user space */
1009 unsigned long templ;
1010
1011 if (PORTNO(tty) == MXSER_PORTS)
1012 return (mxser_ioctl_special(cmd, arg));
1013 if ((cmd != TIOCGSERIAL) && (cmd != TIOCMIWAIT) &&
1014 (cmd != TIOCGICOUNT)) {
1015 if (tty->flags & (1 << TTY_IO_ERROR))
1016 return (-EIO);
1017 }
1018 switch (cmd) {
1019 case TCSBRK: /* SVID version: non-zero arg --> no break */
1020 retval = tty_check_change(tty);
1021 if (retval)
1022 return (retval);
1023 tty_wait_until_sent(tty, 0);
1024 if (!arg)
1025 mxser_send_break(info, HZ / 4); /* 1/4 second */
1026 return (0);
1027 case TCSBRKP: /* support for POSIX tcsendbreak() */
1028 retval = tty_check_change(tty);
1029 if (retval)
1030 return (retval);
1031 tty_wait_until_sent(tty, 0);
1032 mxser_send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
1033 return (0);
1034 case TIOCGSOFTCAR:
1035 return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long *) arg);
1036 case TIOCSSOFTCAR:
1037 if(get_user(templ, (unsigned long *) arg))
1038 return -EFAULT;
1039 arg = templ;
1040 tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) |
1041 (arg ? CLOCAL : 0));
1042 return (0);
1043 case TIOCMGET:
1044 return (mxser_get_modem_info(info, (unsigned int *) arg));
1045 case TIOCMBIS:
1046 case TIOCMBIC:
1047 case TIOCMSET:
1048 return (mxser_set_modem_info(info, cmd, (unsigned int *) arg));
1049 case TIOCGSERIAL:
1050 return (mxser_get_serial_info(info, (struct serial_struct *) arg));
1051 case TIOCSSERIAL:
1052 return (mxser_set_serial_info(info, (struct serial_struct *) arg));
1053 case TIOCSERGETLSR: /* Get line status register */
1054 return (mxser_get_lsr_info(info, (unsigned int *) arg));
1055 /*
1056 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1057 * - mask passed in arg for lines of interest
1058 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1059 * Caller should use TIOCGICOUNT to see which one it was
1060 */
1061 case TIOCMIWAIT:
1062 save_flags(flags);
1063 cli();
1064 cprev = info->icount; /* note the counters on entry */
1065 restore_flags(flags);
1066 while (1) {
1067 interruptible_sleep_on(&info->delta_msr_wait);
1068 /* see if a signal did it */
1069 if (signal_pending(current))
1070 return (-ERESTARTSYS);
1071 save_flags(flags);
1072 cli();
1073 cnow = info->icount; /* atomic copy */
1074 restore_flags(flags);
1075 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1076 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1077 return (-EIO); /* no change => error */
1078 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1079 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1080 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1081 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
1082 return (0);
1083 }
1084 cprev = cnow;
1085 }
1086 /* NOTREACHED */
1087 /*
1088 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1089 * Return: write counters to the user passed counter struct
1090 * NB: both 1->0 and 0->1 transitions are counted except for
1091 * RI where only 0->1 is counted.
1092 */
1093 case TIOCGICOUNT:
1094 save_flags(flags);
1095 cli();
1096 cnow = info->icount;
1097 restore_flags(flags);
1098 p_cuser = (struct serial_icounter_struct *) arg;
1099 if(put_user(cnow.cts, &p_cuser->cts))
1100 return -EFAULT;
1101 if(put_user(cnow.dsr, &p_cuser->dsr))
1102 return -EFAULT;
1103 if(put_user(cnow.rng, &p_cuser->rng))
1104 return -EFAULT;
1105 return put_user(cnow.dcd, &p_cuser->dcd);
1106 case MOXA_HighSpeedOn:
1107 return put_user(info->baud_base != 115200 ? 1 : 0, (int *) arg);
1108 default:
1109 return (-ENOIOCTLCMD);
1110 }
1111 return (0);
1112 }
1113
1114 static int mxser_ioctl_special(unsigned int cmd, unsigned long arg)
1115 {
1116 int i, result, status;
1117
1118 switch (cmd) {
1119 case MOXA_GET_CONF:
1120 if(copy_to_user((struct mxser_hwconf *) arg, mxsercfg,
1121 sizeof(struct mxser_hwconf) * 4))
1122 return -EFAULT;
1123 return 0;
1124 case MOXA_GET_MAJOR:
1125 if(copy_to_user((int *) arg, &ttymajor, sizeof(int)))
1126 return -EFAULT;
1127 return 0;
1128
1129 case MOXA_GET_CUMAJOR:
1130 if(copy_to_user((int *) arg, &calloutmajor, sizeof(int)))
1131 return -EFAULT;
1132 return 0;
1133
1134 case MOXA_CHKPORTENABLE:
1135 result = 0;
1136 for (i = 0; i < MXSER_PORTS; i++) {
1137 if (mxvar_table[i].base)
1138 result |= (1 << i);
1139 }
1140 return put_user(result, (unsigned long *) arg);
1141 case MOXA_GETDATACOUNT:
1142 if(copy_to_user((struct mxser_log *) arg, &mxvar_log, sizeof(mxvar_log)))
1143 return -EFAULT;
1144 return (0);
1145 case MOXA_GETMSTATUS:
1146 for (i = 0; i < MXSER_PORTS; i++) {
1147 GMStatus[i].ri = 0;
1148 if (!mxvar_table[i].base) {
1149 GMStatus[i].dcd = 0;
1150 GMStatus[i].dsr = 0;
1151 GMStatus[i].cts = 0;
1152 continue;
1153 }
1154 if (!mxvar_table[i].tty || !mxvar_table[i].tty->termios)
1155 GMStatus[i].cflag = mxvar_table[i].normal_termios.c_cflag;
1156 else
1157 GMStatus[i].cflag = mxvar_table[i].tty->termios->c_cflag;
1158
1159 status = inb(mxvar_table[i].base + UART_MSR);
1160 if (status & 0x80 /*UART_MSR_DCD */ )
1161 GMStatus[i].dcd = 1;
1162 else
1163 GMStatus[i].dcd = 0;
1164
1165 if (status & 0x20 /*UART_MSR_DSR */ )
1166 GMStatus[i].dsr = 1;
1167 else
1168 GMStatus[i].dsr = 0;
1169
1170
1171 if (status & 0x10 /*UART_MSR_CTS */ )
1172 GMStatus[i].cts = 1;
1173 else
1174 GMStatus[i].cts = 0;
1175 }
1176 if(copy_to_user((struct mxser_mstatus *) arg, GMStatus,
1177 sizeof(struct mxser_mstatus) * MXSER_PORTS))
1178 return -EFAULT;
1179 return 0;
1180 default:
1181 return (-ENOIOCTLCMD);
1182 }
1183 return (0);
1184 }
1185
1186 /*
1187 * This routine is called by the upper-layer tty layer to signal that
1188 * incoming characters should be throttled.
1189 */
1190 static void mxser_throttle(struct tty_struct *tty)
1191 {
1192 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
1193 unsigned long flags;
1194
1195 if (I_IXOFF(tty)) {
1196 info->x_char = STOP_CHAR(tty);
1197 save_flags(flags);
1198 cli();
1199 outb(info->IER, 0);
1200 info->IER |= UART_IER_THRI;
1201 outb(info->IER, info->base + UART_IER); /* force Tx interrupt */
1202 restore_flags(flags);
1203 }
1204 if (info->tty->termios->c_cflag & CRTSCTS) {
1205 info->MCR &= ~UART_MCR_RTS;
1206 save_flags(flags);
1207 cli();
1208 outb(info->MCR, info->base + UART_MCR);
1209 restore_flags(flags);
1210 }
1211 }
1212
1213 static void mxser_unthrottle(struct tty_struct *tty)
1214 {
1215 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
1216 unsigned long flags;
1217
1218 if (I_IXOFF(tty)) {
1219 if (info->x_char)
1220 info->x_char = 0;
1221 else {
1222 info->x_char = START_CHAR(tty);
1223 save_flags(flags);
1224 cli();
1225 outb(info->IER, 0);
1226 info->IER |= UART_IER_THRI; /* force Tx interrupt */
1227 outb(info->IER, info->base + UART_IER);
1228 restore_flags(flags);
1229 }
1230 }
1231 if (info->tty->termios->c_cflag & CRTSCTS) {
1232 info->MCR |= UART_MCR_RTS;
1233 save_flags(flags);
1234 cli();
1235 outb(info->MCR, info->base + UART_MCR);
1236 restore_flags(flags);
1237 }
1238 }
1239
1240 static void mxser_set_termios(struct tty_struct *tty,
1241 struct termios *old_termios)
1242 {
1243 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
1244
1245 /* 8-2-99 by William
1246 if ( (tty->termios->c_cflag == old_termios->c_cflag) &&
1247 (RELEVANT_IFLAG(tty->termios->c_iflag) ==
1248 RELEVANT_IFLAG(old_termios->c_iflag)) )
1249 return;
1250
1251 mxser_change_speed(info, old_termios);
1252
1253 if ( (old_termios->c_cflag & CRTSCTS) &&
1254 !(tty->termios->c_cflag & CRTSCTS) ) {
1255 tty->hw_stopped = 0;
1256 mxser_start(tty);
1257 }
1258 */
1259 if ((tty->termios->c_cflag != old_termios->c_cflag) ||
1260 (RELEVANT_IFLAG(tty->termios->c_iflag) !=
1261 RELEVANT_IFLAG(old_termios->c_iflag))) {
1262
1263 mxser_change_speed(info, old_termios);
1264
1265 if ((old_termios->c_cflag & CRTSCTS) &&
1266 !(tty->termios->c_cflag & CRTSCTS)) {
1267 tty->hw_stopped = 0;
1268 mxser_start(tty);
1269 }
1270 }
1271 /* Handle sw stopped */
1272 if ((old_termios->c_iflag & IXON) &&
1273 !(tty->termios->c_iflag & IXON)) {
1274 tty->stopped = 0;
1275 mxser_start(tty);
1276 }
1277 }
1278
1279 /*
1280 * mxser_stop() and mxser_start()
1281 *
1282 * This routines are called before setting or resetting tty->stopped.
1283 * They enable or disable transmitter interrupts, as necessary.
1284 */
1285 static void mxser_stop(struct tty_struct *tty)
1286 {
1287 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
1288 unsigned long flags;
1289
1290 save_flags(flags);
1291 cli();
1292 if (info->IER & UART_IER_THRI) {
1293 info->IER &= ~UART_IER_THRI;
1294 outb(info->IER, info->base + UART_IER);
1295 }
1296 restore_flags(flags);
1297 }
1298
1299 static void mxser_start(struct tty_struct *tty)
1300 {
1301 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
1302 unsigned long flags;
1303
1304 save_flags(flags);
1305 cli();
1306 if (info->xmit_cnt && info->xmit_buf &&
1307 !(info->IER & UART_IER_THRI)) {
1308 info->IER |= UART_IER_THRI;
1309 outb(info->IER, info->base + UART_IER);
1310 }
1311 restore_flags(flags);
1312 }
1313
1314 /*
1315 * This routine is called by tty_hangup() when a hangup is signaled.
1316 */
1317 void mxser_hangup(struct tty_struct *tty)
1318 {
1319 struct mxser_struct *info = (struct mxser_struct *) tty->driver_data;
1320
1321 mxser_flush_buffer(tty);
1322 mxser_shutdown(info);
1323 info->event = 0;
1324 info->count = 0;
1325 info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CALLOUT_ACTIVE);
1326 info->tty = 0;
1327 wake_up_interruptible(&info->open_wait);
1328 }
1329
1330 /*
1331 * This is the serial driver's generic interrupt routine
1332 */
1333 static void mxser_interrupt(int irq, void *dev_id, struct pt_regs *regs)
1334 {
1335 int status, i;
1336 struct mxser_struct *info;
1337 struct mxser_struct *port;
1338 int max, irqbits, bits, msr;
1339 int pass_counter = 0;
1340
1341 port = 0;
1342 for (i = 0; i < MXSER_BOARDS; i++) {
1343 if (dev_id == &(mxvar_table[i * MXSER_PORTS_PER_BOARD])) {
1344 port = dev_id;
1345 break;
1346 }
1347 }
1348
1349 if (i == MXSER_BOARDS)
1350 return;
1351 if (port == 0)
1352 return;
1353 max = mxser_numports[mxsercfg[i].board_type - 1];
1354
1355 while (1) {
1356 irqbits = inb(port->vector) & port->vectormask;
1357 if (irqbits == port->vectormask)
1358 break;
1359 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
1360 if (irqbits == port->vectormask)
1361 break;
1362 if (bits & irqbits)
1363 continue;
1364 info = port + i;
1365 if (!info->tty ||
1366 (inb(info->base + UART_IIR) & UART_IIR_NO_INT))
1367 continue;
1368 status = inb(info->base + UART_LSR) & info->read_status_mask;
1369 if (status & UART_LSR_DR)
1370 mxser_receive_chars(info, &status);
1371 msr = inb(info->base + UART_MSR);
1372 if (msr & UART_MSR_ANY_DELTA)
1373 mxser_check_modem_status(info, msr);
1374 if (status & UART_LSR_THRE) {
1375 /* 8-2-99 by William
1376 if ( info->x_char || (info->xmit_cnt > 0) )
1377 */
1378 mxser_transmit_chars(info);
1379 }
1380 }
1381 if (pass_counter++ > MXSER_ISR_PASS_LIMIT) {
1382 #if 0
1383 printk("MOXA Smartio/Indusrtio family driver interrupt loop break\n");
1384 #endif
1385 break; /* Prevent infinite loops */
1386 }
1387 }
1388 }
1389
1390 static inline void mxser_receive_chars(struct mxser_struct *info,
1391 int *status)
1392 {
1393 struct tty_struct *tty = info->tty;
1394 unsigned char ch;
1395 int ignored = 0;
1396 int cnt = 0;
1397
1398 do {
1399 ch = inb(info->base + UART_RX);
1400 if (*status & info->ignore_status_mask) {
1401 if (++ignored > 100)
1402 break;
1403 } else {
1404 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
1405 break;
1406 tty->flip.count++;
1407 if (*status & UART_LSR_SPECIAL) {
1408 if (*status & UART_LSR_BI) {
1409 *tty->flip.flag_buf_ptr++ = TTY_BREAK;
1410 if (info->flags & ASYNC_SAK)
1411 do_SAK(tty);
1412 } else if (*status & UART_LSR_PE) {
1413 *tty->flip.flag_buf_ptr++ = TTY_PARITY;
1414 } else if (*status & UART_LSR_FE) {
1415 *tty->flip.flag_buf_ptr++ = TTY_FRAME;
1416 } else if (*status & UART_LSR_OE) {
1417 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
1418 } else
1419 *tty->flip.flag_buf_ptr++ = 0;
1420 } else
1421 *tty->flip.flag_buf_ptr++ = 0;
1422 *tty->flip.char_buf_ptr++ = ch;
1423 cnt++;
1424 }
1425 *status = inb(info->base + UART_LSR) & info->read_status_mask;
1426 } while (*status & UART_LSR_DR);
1427 mxvar_log.rxcnt[info->port] += cnt;
1428 queue_task(&tty->flip.tqueue, &tq_timer);
1429
1430 }
1431
1432 static inline void mxser_transmit_chars(struct mxser_struct *info)
1433 {
1434 int count, cnt;
1435
1436 if (info->x_char) {
1437 outb(info->x_char, info->base + UART_TX);
1438 info->x_char = 0;
1439 mxvar_log.txcnt[info->port]++;
1440 return;
1441 }
1442 if ((info->xmit_cnt <= 0) || info->tty->stopped ||
1443 info->tty->hw_stopped) {
1444 info->IER &= ~UART_IER_THRI;
1445 outb(info->IER, info->base + UART_IER);
1446 return;
1447 }
1448 cnt = info->xmit_cnt;
1449 count = info->xmit_fifo_size;
1450 do {
1451 outb(info->xmit_buf[info->xmit_tail++], info->base + UART_TX);
1452 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE - 1);
1453 if (--info->xmit_cnt <= 0)
1454 break;
1455 } while (--count > 0);
1456 mxvar_log.txcnt[info->port] += (cnt - info->xmit_cnt);
1457
1458 if (info->xmit_cnt < WAKEUP_CHARS) {
1459 set_bit(MXSER_EVENT_TXLOW, &info->event);
1460 schedule_task(&info->tqueue);
1461 }
1462 if (info->xmit_cnt <= 0) {
1463 info->IER &= ~UART_IER_THRI;
1464 outb(info->IER, info->base + UART_IER);
1465 }
1466 }
1467
1468 static inline void mxser_check_modem_status(struct mxser_struct *info,
1469 int status)
1470 {
1471
1472 /* update input line counters */
1473 if (status & UART_MSR_TERI)
1474 info->icount.rng++;
1475 if (status & UART_MSR_DDSR)
1476 info->icount.dsr++;
1477 if (status & UART_MSR_DDCD)
1478 info->icount.dcd++;
1479 if (status & UART_MSR_DCTS)
1480 info->icount.cts++;
1481 wake_up_interruptible(&info->delta_msr_wait);
1482
1483 if ((info->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
1484 if (status & UART_MSR_DCD)
1485 wake_up_interruptible(&info->open_wait);
1486 else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
1487 (info->flags & ASYNC_CALLOUT_NOHUP)))
1488 set_bit(MXSER_EVENT_HANGUP, &info->event);
1489 schedule_task(&info->tqueue);
1490
1491 }
1492 if (info->flags & ASYNC_CTS_FLOW) {
1493 if (info->tty->hw_stopped) {
1494 if (status & UART_MSR_CTS) {
1495 info->tty->hw_stopped = 0;
1496 info->IER |= UART_IER_THRI;
1497 outb(info->IER, info->base + UART_IER);
1498
1499 set_bit(MXSER_EVENT_TXLOW, &info->event);
1500 MOD_INC_USE_COUNT;
1501 if (schedule_task(&info->tqueue) == 0)
1502 MOD_DEC_USE_COUNT;
1503 }
1504 } else {
1505 if (!(status & UART_MSR_CTS)) {
1506 info->tty->hw_stopped = 1;
1507 info->IER &= ~UART_IER_THRI;
1508 outb(info->IER, info->base + UART_IER);
1509 }
1510 }
1511 }
1512 }
1513
1514 static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
1515 struct mxser_struct *info)
1516 {
1517 DECLARE_WAITQUEUE(wait, current);
1518 unsigned long flags;
1519 int retval;
1520 int do_clocal = 0;
1521
1522 /*
1523 * If the device is in the middle of being closed, then block
1524 * until it's done, and then try again.
1525 */
1526 if (tty_hung_up_p(filp) || (info->flags & ASYNC_CLOSING)) {
1527 if (info->flags & ASYNC_CLOSING)
1528 interruptible_sleep_on(&info->close_wait);
1529 #ifdef SERIAL_DO_RESTART
1530 if (info->flags & ASYNC_HUP_NOTIFY)
1531 return (-EAGAIN);
1532 else
1533 return (-ERESTARTSYS);
1534 #else
1535 return (-EAGAIN);
1536 #endif
1537 }
1538 /*
1539 * If this is a callout device, then just make sure the normal
1540 * device isn't being used.
1541 */
1542 if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
1543 if (info->flags & ASYNC_NORMAL_ACTIVE)
1544 return (-EBUSY);
1545 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
1546 (info->flags & ASYNC_SESSION_LOCKOUT) &&
1547 (info->session != current->session))
1548 return (-EBUSY);
1549 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
1550 (info->flags & ASYNC_PGRP_LOCKOUT) &&
1551 (info->pgrp != current->pgrp))
1552 return (-EBUSY);
1553 info->flags |= ASYNC_CALLOUT_ACTIVE;
1554 return (0);
1555 }
1556 /*
1557 * If non-blocking mode is set, or the port is not enabled,
1558 * then make the check up front and then exit.
1559 */
1560 if ((filp->f_flags & O_NONBLOCK) ||
1561 (tty->flags & (1 << TTY_IO_ERROR))) {
1562 if (info->flags & ASYNC_CALLOUT_ACTIVE)
1563 return (-EBUSY);
1564 info->flags |= ASYNC_NORMAL_ACTIVE;
1565 return (0);
1566 }
1567 if (info->flags & ASYNC_CALLOUT_ACTIVE) {
1568 if (info->normal_termios.c_cflag & CLOCAL)
1569 do_clocal = 1;
1570 } else {
1571 if (tty->termios->c_cflag & CLOCAL)
1572 do_clocal = 1;
1573 }
1574
1575 /*
1576 * Block waiting for the carrier detect and the line to become
1577 * free (i.e., not in use by the callout). While we are in
1578 * this loop, info->count is dropped by one, so that
1579 * mxser_close() knows when to free things. We restore it upon
1580 * exit, either normal or abnormal.
1581 */
1582 retval = 0;
1583 add_wait_queue(&info->open_wait, &wait);
1584 save_flags(flags);
1585 cli();
1586 if (!tty_hung_up_p(filp))
1587 info->count--;
1588 restore_flags(flags);
1589 info->blocked_open++;
1590 while (1) {
1591 save_flags(flags);
1592 cli();
1593 if (!(info->flags & ASYNC_CALLOUT_ACTIVE))
1594 outb(inb(info->base + UART_MCR) | UART_MCR_DTR | UART_MCR_RTS,
1595 info->base + UART_MCR);
1596 restore_flags(flags);
1597 current->state = TASK_INTERRUPTIBLE;
1598 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)) {
1599 #ifdef SERIAL_DO_RESTART
1600 if (info->flags & ASYNC_HUP_NOTIFY)
1601 retval = -EAGAIN;
1602 else
1603 retval = -ERESTARTSYS;
1604 #else
1605 retval = -EAGAIN;
1606 #endif
1607 break;
1608 }
1609 if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
1610 !(info->flags & ASYNC_CLOSING) &&
1611 (do_clocal || (inb(info->base + UART_MSR) & UART_MSR_DCD)))
1612 break;
1613 if (signal_pending(current)) {
1614 retval = -ERESTARTSYS;
1615 break;
1616 }
1617 schedule();
1618 }
1619 current->state = TASK_RUNNING;
1620 remove_wait_queue(&info->open_wait, &wait);
1621 if (!tty_hung_up_p(filp))
1622 info->count++;
1623 info->blocked_open--;
1624 if (retval)
1625 return (retval);
1626 info->flags |= ASYNC_NORMAL_ACTIVE;
1627 return (0);
1628 }
1629
1630 static int mxser_startup(struct mxser_struct *info)
1631 {
1632 unsigned long flags;
1633 unsigned long page;
1634
1635 page = get_free_page(GFP_KERNEL);
1636 if (!page)
1637 return (-ENOMEM);
1638
1639 save_flags(flags);
1640 cli();
1641
1642 if (info->flags & ASYNC_INITIALIZED) {
1643 free_page(page);
1644 restore_flags(flags);
1645 return (0);
1646 }
1647 if (!info->base || !info->type) {
1648 if (info->tty)
1649 set_bit(TTY_IO_ERROR, &info->tty->flags);
1650 free_page(page);
1651 restore_flags(flags);
1652 return (0);
1653 }
1654 if (info->xmit_buf)
1655 free_page(page);
1656 else
1657 info->xmit_buf = (unsigned char *) page;
1658
1659 /*
1660 * Clear the FIFO buffers and disable them
1661 * (they will be reenabled in mxser_change_speed())
1662 */
1663 if (info->xmit_fifo_size == 16)
1664 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1665 info->base + UART_FCR);
1666
1667 /*
1668 * At this point there's no way the LSR could still be 0xFF;
1669 * if it is, then bail out, because there's likely no UART
1670 * here.
1671 */
1672 if (inb(info->base + UART_LSR) == 0xff) {
1673 restore_flags(flags);
1674 if (suser()) {
1675 if (info->tty)
1676 set_bit(TTY_IO_ERROR, &info->tty->flags);
1677 return (0);
1678 } else
1679 return (-ENODEV);
1680 }
1681 /*
1682 * Clear the interrupt registers.
1683 */
1684 (void) inb(info->base + UART_LSR);
1685 (void) inb(info->base + UART_RX);
1686 (void) inb(info->base + UART_IIR);
1687 (void) inb(info->base + UART_MSR);
1688
1689 /*
1690 * Now, initialize the UART
1691 */
1692 outb(UART_LCR_WLEN8, info->base + UART_LCR); /* reset DLAB */
1693 info->MCR = UART_MCR_DTR | UART_MCR_RTS;
1694 outb(info->MCR, info->base + UART_MCR);
1695
1696 /*
1697 * Finally, enable interrupts
1698 */
1699 info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
1700 outb(info->IER, info->base + UART_IER); /* enable interrupts */
1701
1702 /*
1703 * And clear the interrupt registers again for luck.
1704 */
1705 (void) inb(info->base + UART_LSR);
1706 (void) inb(info->base + UART_RX);
1707 (void) inb(info->base + UART_IIR);
1708 (void) inb(info->base + UART_MSR);
1709
1710 if (info->tty)
1711 test_and_clear_bit(TTY_IO_ERROR, &info->tty->flags);
1712
1713 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1714
1715 /*
1716 * and set the speed of the serial port
1717 */
1718 mxser_change_speed(info, 0);
1719
1720 info->flags |= ASYNC_INITIALIZED;
1721 restore_flags(flags);
1722 return (0);
1723 }
1724
1725 /*
1726 * This routine will shutdown a serial port; interrupts maybe disabled, and
1727 * DTR is dropped if the hangup on close termio flag is on.
1728 */
1729 static void mxser_shutdown(struct mxser_struct *info)
1730 {
1731 unsigned long flags;
1732
1733 if (!(info->flags & ASYNC_INITIALIZED))
1734 return;
1735
1736 save_flags(flags);
1737 cli(); /* Disable interrupts */
1738
1739 /*
1740 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
1741 * here so the queue might never be waken up
1742 */
1743 wake_up_interruptible(&info->delta_msr_wait);
1744
1745 /*
1746 * Free the IRQ, if necessary
1747 */
1748 if (info->xmit_buf) {
1749 free_page((unsigned long) info->xmit_buf);
1750 info->xmit_buf = 0;
1751 }
1752 info->IER = 0;
1753 outb(0x00, info->base + UART_IER); /* disable all intrs */
1754
1755 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
1756 info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
1757 outb(info->MCR, info->base + UART_MCR);
1758
1759 /* clear Rx/Tx FIFO's */
1760 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT), info->base + UART_FCR);
1761 /* read data port to reset things */
1762 (void) inb(info->base + UART_RX);
1763
1764 if (info->tty)
1765 set_bit(TTY_IO_ERROR, &info->tty->flags);
1766
1767 info->flags &= ~ASYNC_INITIALIZED;
1768 restore_flags(flags);
1769 }
1770
1771 /*
1772 * This routine is called to set the UART divisor registers to match
1773 * the specified baud rate for a serial port.
1774 */
1775 static int mxser_change_speed(struct mxser_struct *info,
1776 struct termios *old_termios)
1777 {
1778 int quot = 0;
1779 unsigned cflag, cval, fcr;
1780 int i;
1781 int ret = 0;
1782 unsigned long flags;
1783
1784 if (!info->tty || !info->tty->termios)
1785 return ret;
1786 cflag = info->tty->termios->c_cflag;
1787 if (!(info->base))
1788 return ret;
1789
1790 #ifndef B921600
1791 #define B921600 (B460800 +1)
1792 #endif
1793 switch (cflag & (CBAUD | CBAUDEX)) {
1794 case B921600:
1795 i = 20;
1796 break;
1797 case B460800:
1798 i = 19;
1799 break;
1800 case B230400:
1801 i = 18;
1802 break;
1803 case B115200:
1804 i = 17;
1805 break;
1806 case B57600:
1807 i = 16;
1808 break;
1809 case B38400:
1810 i = 15;
1811 break;
1812 case B19200:
1813 i = 14;
1814 break;
1815 case B9600:
1816 i = 13;
1817 break;
1818 case B4800:
1819 i = 12;
1820 break;
1821 case B2400:
1822 i = 11;
1823 break;
1824 case B1800:
1825 i = 10;
1826 break;
1827 case B1200:
1828 i = 9;
1829 break;
1830 case B600:
1831 i = 8;
1832 break;
1833 case B300:
1834 i = 7;
1835 break;
1836 case B200:
1837 i = 6;
1838 break;
1839 case B150:
1840 i = 5;
1841 break;
1842 case B134:
1843 i = 4;
1844 break;
1845 case B110:
1846 i = 3;
1847 break;
1848 case B75:
1849 i = 2;
1850 break;
1851 case B50:
1852 i = 1;
1853 break;
1854 default:
1855 i = 0;
1856 break;
1857 }
1858
1859 if (i == 15) {
1860 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1861 i = 16; /* 57600 bps */
1862 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1863 i = 17; /* 115200 bps */
1864
1865 #ifdef ASYNC_SPD_SHI
1866 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1867 i = 18;
1868 #endif
1869
1870 #ifdef ASYNC_SPD_WARP
1871 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1872 i = 19;
1873 #endif
1874 }
1875 if (mxvar_baud_table[i] == 134) {
1876 quot = (2 * info->baud_base / 269);
1877 } else if (mxvar_baud_table[i]) {
1878 quot = info->baud_base / mxvar_baud_table[i];
1879 if (!quot && old_termios) {
1880 /* re-calculate */
1881 info->tty->termios->c_cflag &= ~CBAUD;
1882 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
1883 switch (info->tty->termios->c_cflag & (CBAUD | CBAUDEX)) {
1884 case B921600:
1885 i = 20;
1886 break;
1887 case B460800:
1888 i = 19;
1889 break;
1890 case B230400:
1891 i = 18;
1892 break;
1893 case B115200:
1894 i = 17;
1895 break;
1896 case B57600:
1897 i = 16;
1898 break;
1899 case B38400:
1900 i = 15;
1901 break;
1902 case B19200:
1903 i = 14;
1904 break;
1905 case B9600:
1906 i = 13;
1907 break;
1908 case B4800:
1909 i = 12;
1910 break;
1911 case B2400:
1912 i = 11;
1913 break;
1914 case B1800:
1915 i = 10;
1916 break;
1917 case B1200:
1918 i = 9;
1919 break;
1920 case B600:
1921 i = 8;
1922 break;
1923 case B300:
1924 i = 7;
1925 break;
1926 case B200:
1927 i = 6;
1928 break;
1929 case B150:
1930 i = 5;
1931 break;
1932 case B134:
1933 i = 4;
1934 break;
1935 case B110:
1936 i = 3;
1937 break;
1938 case B75:
1939 i = 2;
1940 break;
1941 case B50:
1942 i = 1;
1943 break;
1944 default:
1945 i = 0;
1946 break;
1947 }
1948 if (i == 15) {
1949 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1950 i = 16; /* 57600 bps */
1951 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1952 i = 17; /* 115200 bps */
1953 #ifdef ASYNC_SPD_SHI
1954 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1955 i = 18;
1956 #endif
1957 #ifdef ASYNC_SPD_WARP
1958 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1959 i = 19;
1960 #endif
1961 }
1962 if (mxvar_baud_table[i] == 134) {
1963 quot = (2 * info->baud_base / 269);
1964 } else if (mxvar_baud_table[i]) {
1965 quot = info->baud_base / mxvar_baud_table[i];
1966 if (quot == 0)
1967 quot = 1;
1968 } else {
1969 quot = 0;
1970 }
1971 } else if (quot == 0)
1972 quot = 1;
1973 } else {
1974 quot = 0;
1975 }
1976
1977 if (quot) {
1978 info->MCR |= UART_MCR_DTR;
1979 save_flags(flags);
1980 cli();
1981 outb(info->MCR, info->base + UART_MCR);
1982 restore_flags(flags);
1983 } else {
1984 info->MCR &= ~UART_MCR_DTR;
1985 save_flags(flags);
1986 cli();
1987 outb(info->MCR, info->base + UART_MCR);
1988 restore_flags(flags);
1989 return ret;
1990 }
1991 /* byte size and parity */
1992 switch (cflag & CSIZE) {
1993 case CS5:
1994 cval = 0x00;
1995 break;
1996 case CS6:
1997 cval = 0x01;
1998 break;
1999 case CS7:
2000 cval = 0x02;
2001 break;
2002 case CS8:
2003 cval = 0x03;
2004 break;
2005 default:
2006 cval = 0x00;
2007 break; /* too keep GCC shut... */
2008 }
2009 if (cflag & CSTOPB)
2010 cval |= 0x04;
2011 if (cflag & PARENB)
2012 cval |= UART_LCR_PARITY;
2013 if (!(cflag & PARODD))
2014 cval |= UART_LCR_EPAR;
2015 if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
2016 fcr = 0;
2017 } else {
2018 fcr = UART_FCR_ENABLE_FIFO;
2019 switch (info->rx_trigger) {
2020 case 1:
2021 fcr |= UART_FCR_TRIGGER_1;
2022 break;
2023 case 4:
2024 fcr |= UART_FCR_TRIGGER_4;
2025 break;
2026 case 8:
2027 fcr |= UART_FCR_TRIGGER_8;
2028 break;
2029 default:
2030 fcr |= UART_FCR_TRIGGER_14;
2031 }
2032 }
2033
2034 /* CTS flow control flag and modem status interrupts */
2035 info->IER &= ~UART_IER_MSI;
2036 info->MCR &= ~UART_MCR_AFE;
2037 if (cflag & CRTSCTS) {
2038 info->flags |= ASYNC_CTS_FLOW;
2039 info->IER |= UART_IER_MSI;
2040 if (info->type == PORT_16550A)
2041 info->MCR |= UART_MCR_AFE;
2042 } else {
2043 info->flags &= ~ASYNC_CTS_FLOW;
2044 }
2045 outb(info->MCR, info->base + UART_MCR);
2046 if (cflag & CLOCAL)
2047 info->flags &= ~ASYNC_CHECK_CD;
2048 else {
2049 info->flags |= ASYNC_CHECK_CD;
2050 info->IER |= UART_IER_MSI;
2051 }
2052 outb(info->IER, info->base + UART_IER);
2053
2054 /*
2055 * Set up parity check flag
2056 */
2057 info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
2058 if (I_INPCK(info->tty))
2059 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
2060 if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2061 info->read_status_mask |= UART_LSR_BI;
2062
2063 info->ignore_status_mask = 0;
2064 #if 0
2065 /* This should be safe, but for some broken bits of hardware... */
2066 if (I_IGNPAR(info->tty)) {
2067 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
2068 info->read_status_mask |= UART_LSR_PE | UART_LSR_FE;
2069 }
2070 #endif
2071 if (I_IGNBRK(info->tty)) {
2072 info->ignore_status_mask |= UART_LSR_BI;
2073 info->read_status_mask |= UART_LSR_BI;
2074 /*
2075 * If we're ignore parity and break indicators, ignore
2076 * overruns too. (For real raw support).
2077 */
2078 if (I_IGNPAR(info->tty)) {
2079 info->ignore_status_mask |= UART_LSR_OE | UART_LSR_PE | UART_LSR_FE;
2080 info->read_status_mask |= UART_LSR_OE | UART_LSR_PE | UART_LSR_FE;
2081 }
2082 }
2083 save_flags(flags);
2084 cli();
2085 outb(cval | UART_LCR_DLAB, info->base + UART_LCR); /* set DLAB */
2086 outb(quot & 0xff, info->base + UART_DLL); /* LS of divisor */
2087 outb(quot >> 8, info->base + UART_DLM); /* MS of divisor */
2088 outb(cval, info->base + UART_LCR); /* reset DLAB */
2089 outb(fcr, info->base + UART_FCR); /* set fcr */
2090 restore_flags(flags);
2091
2092 return ret;
2093 }
2094
2095 /*
2096 * ------------------------------------------------------------
2097 * friends of mxser_ioctl()
2098 * ------------------------------------------------------------
2099 */
2100 static int mxser_get_serial_info(struct mxser_struct *info,
2101 struct serial_struct *retinfo)
2102 {
2103 struct serial_struct tmp;
2104
2105 if (!retinfo)
2106 return (-EFAULT);
2107 memset(&tmp, 0, sizeof(tmp));
2108 tmp.type = info->type;
2109 tmp.line = info->port;
2110 tmp.port = info->base;
2111 tmp.irq = info->irq;
2112 tmp.flags = info->flags;
2113 tmp.baud_base = info->baud_base;
2114 tmp.close_delay = info->close_delay;
2115 tmp.closing_wait = info->closing_wait;
2116 tmp.custom_divisor = info->custom_divisor;
2117 tmp.hub6 = 0;
2118 copy_to_user(retinfo, &tmp, sizeof(*retinfo));
2119 return (0);
2120 }
2121
2122 static int mxser_set_serial_info(struct mxser_struct *info,
2123 struct serial_struct *new_info)
2124 {
2125 struct serial_struct new_serial;
2126 unsigned int flags;
2127 int retval = 0;
2128
2129 if (!new_info || !info->base)
2130 return (-EFAULT);
2131 copy_from_user(&new_serial, new_info, sizeof(new_serial));
2132
2133 if ((new_serial.irq != info->irq) ||
2134 (new_serial.port != info->base) ||
2135 (new_serial.type != info->type) ||
2136 (new_serial.custom_divisor != info->custom_divisor) ||
2137 (new_serial.baud_base != info->baud_base))
2138 return (-EPERM);
2139
2140 flags = info->flags & ASYNC_SPD_MASK;
2141
2142 if (!suser()) {
2143 if ((new_serial.baud_base != info->baud_base) ||
2144 (new_serial.close_delay != info->close_delay) ||
2145 ((new_serial.flags & ~ASYNC_USR_MASK) !=
2146 (info->flags & ~ASYNC_USR_MASK)))
2147 return (-EPERM);
2148 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
2149 (new_serial.flags & ASYNC_USR_MASK));
2150 } else {
2151 /*
2152 * OK, past this point, all the error checking has been done.
2153 * At this point, we start making changes.....
2154 */
2155 info->flags = ((info->flags & ~ASYNC_FLAGS) |
2156 (new_serial.flags & ASYNC_FLAGS));
2157 info->close_delay = new_serial.close_delay * HZ / 100;
2158 info->closing_wait = new_serial.closing_wait * HZ / 100;
2159 }
2160
2161 if (info->flags & ASYNC_INITIALIZED) {
2162 if (flags != (info->flags & ASYNC_SPD_MASK)) {
2163 mxser_change_speed(info, 0);
2164 }
2165 } else
2166 retval = mxser_startup(info);
2167 return (retval);
2168 }
2169
2170 /*
2171 * mxser_get_lsr_info - get line status register info
2172 *
2173 * Purpose: Let user call ioctl() to get info when the UART physically
2174 * is emptied. On bus types like RS485, the transmitter must
2175 * release the bus after transmitting. This must be done when
2176 * the transmit shift register is empty, not be done when the
2177 * transmit holding register is empty. This functionality
2178 * allows an RS485 driver to be written in user space.
2179 */
2180 static int mxser_get_lsr_info(struct mxser_struct *info, unsigned int *value)
2181 {
2182 unsigned char status;
2183 unsigned int result;
2184 unsigned long flags;
2185
2186 save_flags(flags);
2187 cli();
2188 status = inb(info->base + UART_LSR);
2189 restore_flags(flags);
2190 result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
2191 put_user(result, value);
2192 return (0);
2193 }
2194
2195 /*
2196 * This routine sends a break character out the serial port.
2197 */
2198 static void mxser_send_break(struct mxser_struct *info, int duration)
2199 {
2200 unsigned long flags;
2201 if (!info->base)
2202 return;
2203 current->state = TASK_INTERRUPTIBLE;
2204 save_flags(flags);
2205 cli();
2206 outb(inb(info->base + UART_LCR) | UART_LCR_SBC, info->base + UART_LCR);
2207 schedule_timeout(duration);
2208 outb(inb(info->base + UART_LCR) & ~UART_LCR_SBC, info->base + UART_LCR);
2209 restore_flags(flags);
2210 }
2211
2212 static int mxser_get_modem_info(struct mxser_struct *info,
2213 unsigned int *value)
2214 {
2215 unsigned char control, status;
2216 unsigned int result;
2217 unsigned long flags;
2218
2219 control = info->MCR;
2220 save_flags(flags);
2221 cli();
2222 status = inb(info->base + UART_MSR);
2223 if (status & UART_MSR_ANY_DELTA)
2224 mxser_check_modem_status(info, status);
2225 restore_flags(flags);
2226 result = ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
2227 ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
2228 ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
2229 ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
2230 ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
2231 ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
2232 put_user(result, value);
2233 return (0);
2234 }
2235
2236 static int mxser_set_modem_info(struct mxser_struct *info, unsigned int cmd,
2237 unsigned int *value)
2238 {
2239 unsigned int arg;
2240 unsigned long flags;
2241
2242 if(get_user(arg, value))
2243 return -EFAULT;
2244 switch (cmd) {
2245 case TIOCMBIS:
2246 if (arg & TIOCM_RTS)
2247 info->MCR |= UART_MCR_RTS;
2248 if (arg & TIOCM_DTR)
2249 info->MCR |= UART_MCR_DTR;
2250 break;
2251 case TIOCMBIC:
2252 if (arg & TIOCM_RTS)
2253 info->MCR &= ~UART_MCR_RTS;
2254 if (arg & TIOCM_DTR)
2255 info->MCR &= ~UART_MCR_DTR;
2256 break;
2257 case TIOCMSET:
2258 info->MCR = ((info->MCR & ~(UART_MCR_RTS | UART_MCR_DTR)) |
2259 ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0) |
2260 ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0));
2261 break;
2262 default:
2263 return (-EINVAL);
2264 }
2265 save_flags(flags);
2266 cli();
2267 outb(info->MCR, info->base + UART_MCR);
2268 restore_flags(flags);
2269 return (0);
2270 }
2271
2272 static int mxser_read_register(int, unsigned short *);
2273 static int mxser_program_mode(int);
2274 static void mxser_normal_mode(int);
2275
2276 static int mxser_get_ISA_conf(int cap, struct mxser_hwconf *hwconf)
2277 {
2278 int id, i, bits;
2279 unsigned short regs[16], irq;
2280 unsigned char scratch, scratch2;
2281
2282 id = mxser_read_register(cap, regs);
2283 if (id == C168_ASIC_ID)
2284 hwconf->board_type = MXSER_BOARD_C168_ISA;
2285 else if (id == C104_ASIC_ID)
2286 hwconf->board_type = MXSER_BOARD_C104_ISA;
2287 else if (id == CI104J_ASIC_ID)
2288 hwconf->board_type = MXSER_BOARD_CI104J;
2289 else
2290 return (0);
2291 irq = regs[9] & 0x0F;
2292 irq = irq | (irq << 4);
2293 irq = irq | (irq << 8);
2294 if ((irq != regs[9]) || ((id == 1) && (irq != regs[10]))) {
2295 return (MXSER_ERR_IRQ_CONFLIT);
2296 }
2297 if (!irq) {
2298 return (MXSER_ERR_IRQ);
2299 }
2300 for (i = 0; i < 8; i++)
2301 hwconf->ioaddr[i] = (int) regs[i + 1] & 0xFFF8;
2302 hwconf->irq = (int) (irq & 0x0F);
2303 if ((regs[12] & 0x80) == 0) {
2304 return (MXSER_ERR_VECTOR);
2305 }
2306 hwconf->vector = (int) regs[11]; /* interrupt vector */
2307 if (id == 1)
2308 hwconf->vector_mask = 0x00FF;
2309 else
2310 hwconf->vector_mask = 0x000F;
2311 for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2312 if (regs[12] & bits)
2313 hwconf->baud_base[i] = 921600;
2314 else
2315 hwconf->baud_base[i] = 115200;
2316 }
2317 scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2318 outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2319 outb(0, cap + UART_EFR); /* EFR is the same as FCR */
2320 outb(scratch2, cap + UART_LCR);
2321 outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2322 scratch = inb(cap + UART_IIR);
2323 if (scratch & 0xC0)
2324 hwconf->uart_type = PORT_16550A;
2325 else
2326 hwconf->uart_type = PORT_16450;
2327 if (id == 1)
2328 hwconf->ports = 8;
2329 else
2330 hwconf->ports = 4;
2331 return (hwconf->ports);
2332 }
2333
2334 #define CHIP_SK 0x01 /* Serial Data Clock in Eprom */
2335 #define CHIP_DO 0x02 /* Serial Data Output in Eprom */
2336 #define CHIP_CS 0x04 /* Serial Chip Select in Eprom */
2337 #define CHIP_DI 0x08 /* Serial Data Input in Eprom */
2338 #define EN_CCMD 0x000 /* Chip's command register */
2339 #define EN0_RSARLO 0x008 /* Remote start address reg 0 */
2340 #define EN0_RSARHI 0x009 /* Remote start address reg 1 */
2341 #define EN0_RCNTLO 0x00A /* Remote byte count reg WR */
2342 #define EN0_RCNTHI 0x00B /* Remote byte count reg WR */
2343 #define EN0_DCFG 0x00E /* Data configuration reg WR */
2344 #define EN0_PORT 0x010 /* Rcv missed frame error counter RD */
2345 #define ENC_PAGE0 0x000 /* Select page 0 of chip registers */
2346 #define ENC_PAGE3 0x0C0 /* Select page 3 of chip registers */
2347 static int mxser_read_register(int port, unsigned short *regs)
2348 {
2349 int i, k, value, id;
2350 unsigned int j;
2351
2352 id = mxser_program_mode(port);
2353 if (id < 0)
2354 return (id);
2355 for (i = 0; i < 14; i++) {
2356 k = (i & 0x3F) | 0x180;
2357 for (j = 0x100; j > 0; j >>= 1) {
2358 outb(CHIP_CS, port);
2359 if (k & j) {
2360 outb(CHIP_CS | CHIP_DO, port);
2361 outb(CHIP_CS | CHIP_DO | CHIP_SK, port); /* A? bit of read */
2362 } else {
2363 outb(CHIP_CS, port);
2364 outb(CHIP_CS | CHIP_SK, port); /* A? bit of read */
2365 }
2366 }
2367 (void) inb(port);
2368 value = 0;
2369 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
2370 outb(CHIP_CS, port);
2371 outb(CHIP_CS | CHIP_SK, port);
2372 if (inb(port) & CHIP_DI)
2373 value |= j;
2374 }
2375 regs[i] = value;
2376 outb(0, port);
2377 }
2378 mxser_normal_mode(port);
2379 return (id);
2380 }
2381
2382 static int mxser_program_mode(int port)
2383 {
2384 int id, i, j, n;
2385 unsigned long flags;
2386
2387 save_flags(flags);
2388 cli();
2389 outb(0, port);
2390 outb(0, port);
2391 outb(0, port);
2392 (void) inb(port);
2393 (void) inb(port);
2394 outb(0, port);
2395 (void) inb(port);
2396 restore_flags(flags);
2397 id = inb(port + 1) & 0x1F;
2398 if ((id != C168_ASIC_ID) && (id != C104_ASIC_ID) && (id != CI104J_ASIC_ID))
2399 return (-1);
2400 for (i = 0, j = 0; i < 4; i++) {
2401 n = inb(port + 2);
2402 if (n == 'M') {
2403 j = 1;
2404 } else if ((j == 1) && (n == 1)) {
2405 j = 2;
2406 break;
2407 } else
2408 j = 0;
2409 }
2410 if (j != 2)
2411 id = -2;
2412 return (id);
2413 }
2414
2415 static void mxser_normal_mode(int port)
2416 {
2417 int i, n;
2418
2419 outb(0xA5, port + 1);
2420 outb(0x80, port + 3);
2421 outb(12, port + 0); /* 9600 bps */
2422 outb(0, port + 1);
2423 outb(0x03, port + 3); /* 8 data bits */
2424 outb(0x13, port + 4); /* loop back mode */
2425 for (i = 0; i < 16; i++) {
2426 n = inb(port + 5);
2427 if ((n & 0x61) == 0x60)
2428 break;
2429 if ((n & 1) == 1)
2430 (void) inb(port);
2431 }
2432 outb(0x00, port + 4);
2433 }
2434
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