projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
tty: moxa: Kill off the throttle method
[deliverable/linux.git] / drivers / char / moxa.c
1 /*****************************************************************************/
2 /*
3 * moxa.c -- MOXA Intellio family multiport serial driver.
4 *
5 * Copyright (C) 1999-2000 Moxa Technologies (support@moxa.com).
6 * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
7 *
8 * This code is loosely based on the Linux serial driver, written by
9 * Linus Torvalds, Theodore T'so and 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
17 /*
18 * MOXA Intellio Series Driver
19 * for : LINUX
20 * date : 1999/1/7
21 * version : 5.1
22 */
23
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/mm.h>
27 #include <linux/ioport.h>
28 #include <linux/errno.h>
29 #include <linux/firmware.h>
30 #include <linux/signal.h>
31 #include <linux/sched.h>
32 #include <linux/timer.h>
33 #include <linux/interrupt.h>
34 #include <linux/tty.h>
35 #include <linux/tty_flip.h>
36 #include <linux/major.h>
37 #include <linux/smp_lock.h>
38 #include <linux/string.h>
39 #include <linux/fcntl.h>
40 #include <linux/ptrace.h>
41 #include <linux/serial.h>
42 #include <linux/tty_driver.h>
43 #include <linux/delay.h>
44 #include <linux/pci.h>
45 #include <linux/init.h>
46 #include <linux/bitops.h>
47
48 #include <asm/system.h>
49 #include <asm/io.h>
50 #include <asm/uaccess.h>
51
52 #include "moxa.h"
53
54 #define MOXA_VERSION "6.0k"
55
56 #define MOXA_FW_HDRLEN 32
57
58 #define MOXAMAJOR 172
59
60 #define MAX_BOARDS 4 /* Don't change this value */
61 #define MAX_PORTS_PER_BOARD 32 /* Don't change this value */
62 #define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD)
63
64 #define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
65 (brd)->boardType == MOXA_BOARD_C320_PCI)
66
67 /*
68 * Define the Moxa PCI vendor and device IDs.
69 */
70 #define MOXA_BUS_TYPE_ISA 0
71 #define MOXA_BUS_TYPE_PCI 1
72
73 enum {
74 MOXA_BOARD_C218_PCI = 1,
75 MOXA_BOARD_C218_ISA,
76 MOXA_BOARD_C320_PCI,
77 MOXA_BOARD_C320_ISA,
78 MOXA_BOARD_CP204J,
79 };
80
81 static char *moxa_brdname[] =
82 {
83 "C218 Turbo PCI series",
84 "C218 Turbo ISA series",
85 "C320 Turbo PCI series",
86 "C320 Turbo ISA series",
87 "CP-204J series",
88 };
89
90 #ifdef CONFIG_PCI
91 static struct pci_device_id moxa_pcibrds[] = {
92 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
93 .driver_data = MOXA_BOARD_C218_PCI },
94 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
95 .driver_data = MOXA_BOARD_C320_PCI },
96 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
97 .driver_data = MOXA_BOARD_CP204J },
98 { 0 }
99 };
100 MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
101 #endif /* CONFIG_PCI */
102
103 struct moxa_port;
104
105 static struct moxa_board_conf {
106 int boardType;
107 int numPorts;
108 int busType;
109
110 unsigned int ready;
111
112 struct moxa_port *ports;
113
114 void __iomem *basemem;
115 void __iomem *intNdx;
116 void __iomem *intPend;
117 void __iomem *intTable;
118 } moxa_boards[MAX_BOARDS];
119
120 struct mxser_mstatus {
121 tcflag_t cflag;
122 int cts;
123 int dsr;
124 int ri;
125 int dcd;
126 };
127
128 struct moxaq_str {
129 int inq;
130 int outq;
131 };
132
133 struct moxa_port {
134 struct tty_port port;
135 struct moxa_board_conf *board;
136 void __iomem *tableAddr;
137
138 int type;
139 int cflag;
140 unsigned long statusflags;
141
142 u8 DCDState;
143 u8 lineCtrl;
144 u8 lowChkFlag;
145 };
146
147 struct mon_str {
148 int tick;
149 int rxcnt[MAX_PORTS];
150 int txcnt[MAX_PORTS];
151 };
152
153 /* statusflags */
154 #define TXSTOPPED 1
155 #define LOWWAIT 2
156 #define EMPTYWAIT 3
157
158 #define SERIAL_DO_RESTART
159
160 #define WAKEUP_CHARS 256
161
162 static int ttymajor = MOXAMAJOR;
163 static struct mon_str moxaLog;
164 static unsigned int moxaFuncTout = HZ / 2;
165 static unsigned int moxaLowWaterChk;
166 static DEFINE_MUTEX(moxa_openlock);
167 /* Variables for insmod */
168 #ifdef MODULE
169 static unsigned long baseaddr[MAX_BOARDS];
170 static unsigned int type[MAX_BOARDS];
171 static unsigned int numports[MAX_BOARDS];
172 #endif
173
174 MODULE_AUTHOR("William Chen");
175 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
176 MODULE_LICENSE("GPL");
177 #ifdef MODULE
178 module_param_array(type, uint, NULL, 0);
179 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
180 module_param_array(baseaddr, ulong, NULL, 0);
181 MODULE_PARM_DESC(baseaddr, "base address");
182 module_param_array(numports, uint, NULL, 0);
183 MODULE_PARM_DESC(numports, "numports (ignored for C218)");
184 #endif
185 module_param(ttymajor, int, 0);
186
187 /*
188 * static functions:
189 */
190 static int moxa_open(struct tty_struct *, struct file *);
191 static void moxa_close(struct tty_struct *, struct file *);
192 static int moxa_write(struct tty_struct *, const unsigned char *, int);
193 static int moxa_write_room(struct tty_struct *);
194 static void moxa_flush_buffer(struct tty_struct *);
195 static int moxa_chars_in_buffer(struct tty_struct *);
196 static void moxa_set_termios(struct tty_struct *, struct ktermios *);
197 static void moxa_stop(struct tty_struct *);
198 static void moxa_start(struct tty_struct *);
199 static void moxa_hangup(struct tty_struct *);
200 static int moxa_tiocmget(struct tty_struct *tty, struct file *file);
201 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
202 unsigned int set, unsigned int clear);
203 static void moxa_poll(unsigned long);
204 static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
205 static void moxa_setup_empty_event(struct tty_struct *);
206 static void moxa_shutdown(struct tty_port *);
207 static int moxa_carrier_raised(struct tty_port *);
208 static void moxa_dtr_rts(struct tty_port *, int);
209 /*
210 * moxa board interface functions:
211 */
212 static void MoxaPortEnable(struct moxa_port *);
213 static void MoxaPortDisable(struct moxa_port *);
214 static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
215 static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
216 static void MoxaPortLineCtrl(struct moxa_port *, int, int);
217 static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
218 static int MoxaPortLineStatus(struct moxa_port *);
219 static void MoxaPortFlushData(struct moxa_port *, int);
220 static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
221 static int MoxaPortReadData(struct moxa_port *);
222 static int MoxaPortTxQueue(struct moxa_port *);
223 static int MoxaPortRxQueue(struct moxa_port *);
224 static int MoxaPortTxFree(struct moxa_port *);
225 static void MoxaPortTxDisable(struct moxa_port *);
226 static void MoxaPortTxEnable(struct moxa_port *);
227 static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
228 static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
229 static void MoxaSetFifo(struct moxa_port *port, int enable);
230
231 /*
232 * I/O functions
233 */
234
235 static DEFINE_SPINLOCK(moxafunc_lock);
236
237 static void moxa_wait_finish(void __iomem *ofsAddr)
238 {
239 unsigned long end = jiffies + moxaFuncTout;
240
241 while (readw(ofsAddr + FuncCode) != 0)
242 if (time_after(jiffies, end))
243 return;
244 if (readw(ofsAddr + FuncCode) != 0 && printk_ratelimit())
245 printk(KERN_WARNING "moxa function expired\n");
246 }
247
248 static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
249 {
250 unsigned long flags;
251 spin_lock_irqsave(&moxafunc_lock, flags);
252 writew(arg, ofsAddr + FuncArg);
253 writew(cmd, ofsAddr + FuncCode);
254 moxa_wait_finish(ofsAddr);
255 spin_unlock_irqrestore(&moxafunc_lock, flags);
256 }
257
258 static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
259 {
260 unsigned long flags;
261 u16 ret;
262 spin_lock_irqsave(&moxafunc_lock, flags);
263 writew(arg, ofsAddr + FuncArg);
264 writew(cmd, ofsAddr + FuncCode);
265 moxa_wait_finish(ofsAddr);
266 ret = readw(ofsAddr + FuncArg);
267 spin_unlock_irqrestore(&moxafunc_lock, flags);
268 return ret;
269 }
270
271 static void moxa_low_water_check(void __iomem *ofsAddr)
272 {
273 u16 rptr, wptr, mask, len;
274
275 if (readb(ofsAddr + FlagStat) & Xoff_state) {
276 rptr = readw(ofsAddr + RXrptr);
277 wptr = readw(ofsAddr + RXwptr);
278 mask = readw(ofsAddr + RX_mask);
279 len = (wptr - rptr) & mask;
280 if (len <= Low_water)
281 moxafunc(ofsAddr, FC_SendXon, 0);
282 }
283 }
284
285 /*
286 * TTY operations
287 */
288
289 static int moxa_ioctl(struct tty_struct *tty, struct file *file,
290 unsigned int cmd, unsigned long arg)
291 {
292 struct moxa_port *ch = tty->driver_data;
293 void __user *argp = (void __user *)arg;
294 int status, ret = 0;
295
296 if (tty->index == MAX_PORTS) {
297 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
298 cmd != MOXA_GETMSTATUS)
299 return -EINVAL;
300 } else if (!ch)
301 return -ENODEV;
302
303 switch (cmd) {
304 case MOXA_GETDATACOUNT:
305 moxaLog.tick = jiffies;
306 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
307 ret = -EFAULT;
308 break;
309 case MOXA_FLUSH_QUEUE:
310 MoxaPortFlushData(ch, arg);
311 break;
312 case MOXA_GET_IOQUEUE: {
313 struct moxaq_str __user *argm = argp;
314 struct moxaq_str tmp;
315 struct moxa_port *p;
316 unsigned int i, j;
317
318 mutex_lock(&moxa_openlock);
319 for (i = 0; i < MAX_BOARDS; i++) {
320 p = moxa_boards[i].ports;
321 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
322 memset(&tmp, 0, sizeof(tmp));
323 if (moxa_boards[i].ready) {
324 tmp.inq = MoxaPortRxQueue(p);
325 tmp.outq = MoxaPortTxQueue(p);
326 }
327 if (copy_to_user(argm, &tmp, sizeof(tmp))) {
328 mutex_unlock(&moxa_openlock);
329 return -EFAULT;
330 }
331 }
332 }
333 mutex_unlock(&moxa_openlock);
334 break;
335 } case MOXA_GET_OQUEUE:
336 status = MoxaPortTxQueue(ch);
337 ret = put_user(status, (unsigned long __user *)argp);
338 break;
339 case MOXA_GET_IQUEUE:
340 status = MoxaPortRxQueue(ch);
341 ret = put_user(status, (unsigned long __user *)argp);
342 break;
343 case MOXA_GETMSTATUS: {
344 struct mxser_mstatus __user *argm = argp;
345 struct mxser_mstatus tmp;
346 struct moxa_port *p;
347 unsigned int i, j;
348
349 mutex_lock(&moxa_openlock);
350 for (i = 0; i < MAX_BOARDS; i++) {
351 p = moxa_boards[i].ports;
352 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
353 struct tty_struct *ttyp;
354 memset(&tmp, 0, sizeof(tmp));
355 if (!moxa_boards[i].ready)
356 goto copy;
357
358 status = MoxaPortLineStatus(p);
359 if (status & 1)
360 tmp.cts = 1;
361 if (status & 2)
362 tmp.dsr = 1;
363 if (status & 4)
364 tmp.dcd = 1;
365
366 ttyp = tty_port_tty_get(&p->port);
367 if (!ttyp || !ttyp->termios)
368 tmp.cflag = p->cflag;
369 else
370 tmp.cflag = ttyp->termios->c_cflag;
371 tty_kref_put(tty);
372 copy:
373 if (copy_to_user(argm, &tmp, sizeof(tmp))) {
374 mutex_unlock(&moxa_openlock);
375 return -EFAULT;
376 }
377 }
378 }
379 mutex_unlock(&moxa_openlock);
380 break;
381 }
382 case TIOCGSERIAL:
383 mutex_lock(&ch->port.mutex);
384 ret = moxa_get_serial_info(ch, argp);
385 mutex_unlock(&ch->port.mutex);
386 break;
387 case TIOCSSERIAL:
388 mutex_lock(&ch->port.mutex);
389 ret = moxa_set_serial_info(ch, argp);
390 mutex_unlock(&ch->port.mutex);
391 break;
392 default:
393 ret = -ENOIOCTLCMD;
394 }
395 return ret;
396 }
397
398 static int moxa_break_ctl(struct tty_struct *tty, int state)
399 {
400 struct moxa_port *port = tty->driver_data;
401
402 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
403 Magic_code);
404 return 0;
405 }
406
407 static const struct tty_operations moxa_ops = {
408 .open = moxa_open,
409 .close = moxa_close,
410 .write = moxa_write,
411 .write_room = moxa_write_room,
412 .flush_buffer = moxa_flush_buffer,
413 .chars_in_buffer = moxa_chars_in_buffer,
414 .ioctl = moxa_ioctl,
415 .set_termios = moxa_set_termios,
416 .stop = moxa_stop,
417 .start = moxa_start,
418 .hangup = moxa_hangup,
419 .break_ctl = moxa_break_ctl,
420 .tiocmget = moxa_tiocmget,
421 .tiocmset = moxa_tiocmset,
422 };
423
424 static const struct tty_port_operations moxa_port_ops = {
425 .carrier_raised = moxa_carrier_raised,
426 .dtr_rts = moxa_dtr_rts,
427 .shutdown = moxa_shutdown,
428 };
429
430 static struct tty_driver *moxaDriver;
431 static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
432 static DEFINE_SPINLOCK(moxa_lock);
433
434 /*
435 * HW init
436 */
437
438 static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
439 {
440 switch (brd->boardType) {
441 case MOXA_BOARD_C218_ISA:
442 case MOXA_BOARD_C218_PCI:
443 if (model != 1)
444 goto err;
445 break;
446 case MOXA_BOARD_CP204J:
447 if (model != 3)
448 goto err;
449 break;
450 default:
451 if (model != 2)
452 goto err;
453 break;
454 }
455 return 0;
456 err:
457 return -EINVAL;
458 }
459
460 static int moxa_check_fw(const void *ptr)
461 {
462 const __le16 *lptr = ptr;
463
464 if (*lptr != cpu_to_le16(0x7980))
465 return -EINVAL;
466
467 return 0;
468 }
469
470 static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
471 size_t len)
472 {
473 void __iomem *baseAddr = brd->basemem;
474 u16 tmp;
475
476 writeb(HW_reset, baseAddr + Control_reg); /* reset */
477 msleep(10);
478 memset_io(baseAddr, 0, 4096);
479 memcpy_toio(baseAddr, buf, len); /* download BIOS */
480 writeb(0, baseAddr + Control_reg); /* restart */
481
482 msleep(2000);
483
484 switch (brd->boardType) {
485 case MOXA_BOARD_C218_ISA:
486 case MOXA_BOARD_C218_PCI:
487 tmp = readw(baseAddr + C218_key);
488 if (tmp != C218_KeyCode)
489 goto err;
490 break;
491 case MOXA_BOARD_CP204J:
492 tmp = readw(baseAddr + C218_key);
493 if (tmp != CP204J_KeyCode)
494 goto err;
495 break;
496 default:
497 tmp = readw(baseAddr + C320_key);
498 if (tmp != C320_KeyCode)
499 goto err;
500 tmp = readw(baseAddr + C320_status);
501 if (tmp != STS_init) {
502 printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
503 "module not found\n");
504 return -EIO;
505 }
506 break;
507 }
508
509 return 0;
510 err:
511 printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
512 return -EIO;
513 }
514
515 static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
516 size_t len)
517 {
518 void __iomem *baseAddr = brd->basemem;
519
520 if (len < 7168) {
521 printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
522 return -EINVAL;
523 }
524
525 writew(len - 7168 - 2, baseAddr + C320bapi_len);
526 writeb(1, baseAddr + Control_reg); /* Select Page 1 */
527 memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
528 writeb(2, baseAddr + Control_reg); /* Select Page 2 */
529 memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
530
531 return 0;
532 }
533
534 static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
535 size_t len)
536 {
537 void __iomem *baseAddr = brd->basemem;
538 const __le16 *uptr = ptr;
539 size_t wlen, len2, j;
540 unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
541 unsigned int i, retry;
542 u16 usum, keycode;
543
544 keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
545 C218_KeyCode;
546
547 switch (brd->boardType) {
548 case MOXA_BOARD_CP204J:
549 case MOXA_BOARD_C218_ISA:
550 case MOXA_BOARD_C218_PCI:
551 key = C218_key;
552 loadbuf = C218_LoadBuf;
553 loadlen = C218DLoad_len;
554 checksum = C218check_sum;
555 checksum_ok = C218chksum_ok;
556 break;
557 default:
558 key = C320_key;
559 keycode = C320_KeyCode;
560 loadbuf = C320_LoadBuf;
561 loadlen = C320DLoad_len;
562 checksum = C320check_sum;
563 checksum_ok = C320chksum_ok;
564 break;
565 }
566
567 usum = 0;
568 wlen = len >> 1;
569 for (i = 0; i < wlen; i++)
570 usum += le16_to_cpu(uptr[i]);
571 retry = 0;
572 do {
573 wlen = len >> 1;
574 j = 0;
575 while (wlen) {
576 len2 = (wlen > 2048) ? 2048 : wlen;
577 wlen -= len2;
578 memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
579 j += len2 << 1;
580
581 writew(len2, baseAddr + loadlen);
582 writew(0, baseAddr + key);
583 for (i = 0; i < 100; i++) {
584 if (readw(baseAddr + key) == keycode)
585 break;
586 msleep(10);
587 }
588 if (readw(baseAddr + key) != keycode)
589 return -EIO;
590 }
591 writew(0, baseAddr + loadlen);
592 writew(usum, baseAddr + checksum);
593 writew(0, baseAddr + key);
594 for (i = 0; i < 100; i++) {
595 if (readw(baseAddr + key) == keycode)
596 break;
597 msleep(10);
598 }
599 retry++;
600 } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
601 if (readb(baseAddr + checksum_ok) != 1)
602 return -EIO;
603
604 writew(0, baseAddr + key);
605 for (i = 0; i < 600; i++) {
606 if (readw(baseAddr + Magic_no) == Magic_code)
607 break;
608 msleep(10);
609 }
610 if (readw(baseAddr + Magic_no) != Magic_code)
611 return -EIO;
612
613 if (MOXA_IS_320(brd)) {
614 if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */
615 writew(0x3800, baseAddr + TMS320_PORT1);
616 writew(0x3900, baseAddr + TMS320_PORT2);
617 writew(28499, baseAddr + TMS320_CLOCK);
618 } else {
619 writew(0x3200, baseAddr + TMS320_PORT1);
620 writew(0x3400, baseAddr + TMS320_PORT2);
621 writew(19999, baseAddr + TMS320_CLOCK);
622 }
623 }
624 writew(1, baseAddr + Disable_IRQ);
625 writew(0, baseAddr + Magic_no);
626 for (i = 0; i < 500; i++) {
627 if (readw(baseAddr + Magic_no) == Magic_code)
628 break;
629 msleep(10);
630 }
631 if (readw(baseAddr + Magic_no) != Magic_code)
632 return -EIO;
633
634 if (MOXA_IS_320(brd)) {
635 j = readw(baseAddr + Module_cnt);
636 if (j <= 0)
637 return -EIO;
638 brd->numPorts = j * 8;
639 writew(j, baseAddr + Module_no);
640 writew(0, baseAddr + Magic_no);
641 for (i = 0; i < 600; i++) {
642 if (readw(baseAddr + Magic_no) == Magic_code)
643 break;
644 msleep(10);
645 }
646 if (readw(baseAddr + Magic_no) != Magic_code)
647 return -EIO;
648 }
649 brd->intNdx = baseAddr + IRQindex;
650 brd->intPend = baseAddr + IRQpending;
651 brd->intTable = baseAddr + IRQtable;
652
653 return 0;
654 }
655
656 static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
657 size_t len)
658 {
659 void __iomem *ofsAddr, *baseAddr = brd->basemem;
660 struct moxa_port *port;
661 int retval, i;
662
663 if (len % 2) {
664 printk(KERN_ERR "MOXA: bios length is not even\n");
665 return -EINVAL;
666 }
667
668 retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
669 if (retval)
670 return retval;
671
672 switch (brd->boardType) {
673 case MOXA_BOARD_C218_ISA:
674 case MOXA_BOARD_C218_PCI:
675 case MOXA_BOARD_CP204J:
676 port = brd->ports;
677 for (i = 0; i < brd->numPorts; i++, port++) {
678 port->board = brd;
679 port->DCDState = 0;
680 port->tableAddr = baseAddr + Extern_table +
681 Extern_size * i;
682 ofsAddr = port->tableAddr;
683 writew(C218rx_mask, ofsAddr + RX_mask);
684 writew(C218tx_mask, ofsAddr + TX_mask);
685 writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
686 writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
687
688 writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
689 writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
690
691 }
692 break;
693 default:
694 port = brd->ports;
695 for (i = 0; i < brd->numPorts; i++, port++) {
696 port->board = brd;
697 port->DCDState = 0;
698 port->tableAddr = baseAddr + Extern_table +
699 Extern_size * i;
700 ofsAddr = port->tableAddr;
701 switch (brd->numPorts) {
702 case 8:
703 writew(C320p8rx_mask, ofsAddr + RX_mask);
704 writew(C320p8tx_mask, ofsAddr + TX_mask);
705 writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
706 writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
707 writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
708 writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
709
710 break;
711 case 16:
712 writew(C320p16rx_mask, ofsAddr + RX_mask);
713 writew(C320p16tx_mask, ofsAddr + TX_mask);
714 writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
715 writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
716 writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
717 writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
718 break;
719
720 case 24:
721 writew(C320p24rx_mask, ofsAddr + RX_mask);
722 writew(C320p24tx_mask, ofsAddr + TX_mask);
723 writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
724 writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
725 writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
726 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
727 break;
728 case 32:
729 writew(C320p32rx_mask, ofsAddr + RX_mask);
730 writew(C320p32tx_mask, ofsAddr + TX_mask);
731 writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
732 writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
733 writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
734 writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
735 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
736 break;
737 }
738 }
739 break;
740 }
741 return 0;
742 }
743
744 static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
745 {
746 const void *ptr = fw->data;
747 char rsn[64];
748 u16 lens[5];
749 size_t len;
750 unsigned int a, lenp, lencnt;
751 int ret = -EINVAL;
752 struct {
753 __le32 magic; /* 0x34303430 */
754 u8 reserved1[2];
755 u8 type; /* UNIX = 3 */
756 u8 model; /* C218T=1, C320T=2, CP204=3 */
757 u8 reserved2[8];
758 __le16 len[5];
759 } const *hdr = ptr;
760
761 BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
762
763 if (fw->size < MOXA_FW_HDRLEN) {
764 strcpy(rsn, "too short (even header won't fit)");
765 goto err;
766 }
767 if (hdr->magic != cpu_to_le32(0x30343034)) {
768 sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
769 goto err;
770 }
771 if (hdr->type != 3) {
772 sprintf(rsn, "not for linux, type is %u", hdr->type);
773 goto err;
774 }
775 if (moxa_check_fw_model(brd, hdr->model)) {
776 sprintf(rsn, "not for this card, model is %u", hdr->model);
777 goto err;
778 }
779
780 len = MOXA_FW_HDRLEN;
781 lencnt = hdr->model == 2 ? 5 : 3;
782 for (a = 0; a < ARRAY_SIZE(lens); a++) {
783 lens[a] = le16_to_cpu(hdr->len[a]);
784 if (lens[a] && len + lens[a] <= fw->size &&
785 moxa_check_fw(&fw->data[len]))
786 printk(KERN_WARNING "MOXA firmware: unexpected input "
787 "at offset %u, but going on\n", (u32)len);
788 if (!lens[a] && a < lencnt) {
789 sprintf(rsn, "too few entries in fw file");
790 goto err;
791 }
792 len += lens[a];
793 }
794
795 if (len != fw->size) {
796 sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
797 (u32)len);
798 goto err;
799 }
800
801 ptr += MOXA_FW_HDRLEN;
802 lenp = 0; /* bios */
803
804 strcpy(rsn, "read above");
805
806 ret = moxa_load_bios(brd, ptr, lens[lenp]);
807 if (ret)
808 goto err;
809
810 /* we skip the tty section (lens[1]), since we don't need it */
811 ptr += lens[lenp] + lens[lenp + 1];
812 lenp += 2; /* comm */
813
814 if (hdr->model == 2) {
815 ret = moxa_load_320b(brd, ptr, lens[lenp]);
816 if (ret)
817 goto err;
818 /* skip another tty */
819 ptr += lens[lenp] + lens[lenp + 1];
820 lenp += 2;
821 }
822
823 ret = moxa_load_code(brd, ptr, lens[lenp]);
824 if (ret)
825 goto err;
826
827 return 0;
828 err:
829 printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
830 return ret;
831 }
832
833 static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
834 {
835 const struct firmware *fw;
836 const char *file;
837 struct moxa_port *p;
838 unsigned int i;
839 int ret;
840
841 brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
842 GFP_KERNEL);
843 if (brd->ports == NULL) {
844 printk(KERN_ERR "cannot allocate memory for ports\n");
845 ret = -ENOMEM;
846 goto err;
847 }
848
849 for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
850 tty_port_init(&p->port);
851 p->port.ops = &moxa_port_ops;
852 p->type = PORT_16550A;
853 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
854 }
855
856 switch (brd->boardType) {
857 case MOXA_BOARD_C218_ISA:
858 case MOXA_BOARD_C218_PCI:
859 file = "c218tunx.cod";
860 break;
861 case MOXA_BOARD_CP204J:
862 file = "cp204unx.cod";
863 break;
864 default:
865 file = "c320tunx.cod";
866 break;
867 }
868
869 ret = request_firmware(&fw, file, dev);
870 if (ret) {
871 printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
872 "you've placed '%s' file into your firmware "
873 "loader directory (e.g. /lib/firmware)\n",
874 file);
875 goto err_free;
876 }
877
878 ret = moxa_load_fw(brd, fw);
879
880 release_firmware(fw);
881
882 if (ret)
883 goto err_free;
884
885 spin_lock_bh(&moxa_lock);
886 brd->ready = 1;
887 if (!timer_pending(&moxaTimer))
888 mod_timer(&moxaTimer, jiffies + HZ / 50);
889 spin_unlock_bh(&moxa_lock);
890
891 return 0;
892 err_free:
893 kfree(brd->ports);
894 err:
895 return ret;
896 }
897
898 static void moxa_board_deinit(struct moxa_board_conf *brd)
899 {
900 unsigned int a, opened;
901
902 mutex_lock(&moxa_openlock);
903 spin_lock_bh(&moxa_lock);
904 brd->ready = 0;
905 spin_unlock_bh(&moxa_lock);
906
907 /* pci hot-un-plug support */
908 for (a = 0; a < brd->numPorts; a++)
909 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
910 struct tty_struct *tty = tty_port_tty_get(
911 &brd->ports[a].port);
912 if (tty) {
913 tty_hangup(tty);
914 tty_kref_put(tty);
915 }
916 }
917 while (1) {
918 opened = 0;
919 for (a = 0; a < brd->numPorts; a++)
920 if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
921 opened++;
922 mutex_unlock(&moxa_openlock);
923 if (!opened)
924 break;
925 msleep(50);
926 mutex_lock(&moxa_openlock);
927 }
928
929 iounmap(brd->basemem);
930 brd->basemem = NULL;
931 kfree(brd->ports);
932 }
933
934 #ifdef CONFIG_PCI
935 static int __devinit moxa_pci_probe(struct pci_dev *pdev,
936 const struct pci_device_id *ent)
937 {
938 struct moxa_board_conf *board;
939 unsigned int i;
940 int board_type = ent->driver_data;
941 int retval;
942
943 retval = pci_enable_device(pdev);
944 if (retval) {
945 dev_err(&pdev->dev, "can't enable pci device\n");
946 goto err;
947 }
948
949 for (i = 0; i < MAX_BOARDS; i++)
950 if (moxa_boards[i].basemem == NULL)
951 break;
952
953 retval = -ENODEV;
954 if (i >= MAX_BOARDS) {
955 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
956 "found. Board is ignored.\n", MAX_BOARDS);
957 goto err;
958 }
959
960 board = &moxa_boards[i];
961
962 retval = pci_request_region(pdev, 2, "moxa-base");
963 if (retval) {
964 dev_err(&pdev->dev, "can't request pci region 2\n");
965 goto err;
966 }
967
968 board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
969 if (board->basemem == NULL) {
970 dev_err(&pdev->dev, "can't remap io space 2\n");
971 goto err_reg;
972 }
973
974 board->boardType = board_type;
975 switch (board_type) {
976 case MOXA_BOARD_C218_ISA:
977 case MOXA_BOARD_C218_PCI:
978 board->numPorts = 8;
979 break;
980
981 case MOXA_BOARD_CP204J:
982 board->numPorts = 4;
983 break;
984 default:
985 board->numPorts = 0;
986 break;
987 }
988 board->busType = MOXA_BUS_TYPE_PCI;
989
990 retval = moxa_init_board(board, &pdev->dev);
991 if (retval)
992 goto err_base;
993
994 pci_set_drvdata(pdev, board);
995
996 dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
997 moxa_brdname[board_type - 1], board->numPorts);
998
999 return 0;
1000 err_base:
1001 iounmap(board->basemem);
1002 board->basemem = NULL;
1003 err_reg:
1004 pci_release_region(pdev, 2);
1005 err:
1006 return retval;
1007 }
1008
1009 static void __devexit moxa_pci_remove(struct pci_dev *pdev)
1010 {
1011 struct moxa_board_conf *brd = pci_get_drvdata(pdev);
1012
1013 moxa_board_deinit(brd);
1014
1015 pci_release_region(pdev, 2);
1016 }
1017
1018 static struct pci_driver moxa_pci_driver = {
1019 .name = "moxa",
1020 .id_table = moxa_pcibrds,
1021 .probe = moxa_pci_probe,
1022 .remove = __devexit_p(moxa_pci_remove)
1023 };
1024 #endif /* CONFIG_PCI */
1025
1026 static int __init moxa_init(void)
1027 {
1028 unsigned int isabrds = 0;
1029 int retval = 0;
1030
1031 printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1032 MOXA_VERSION);
1033 moxaDriver = alloc_tty_driver(MAX_PORTS + 1);
1034 if (!moxaDriver)
1035 return -ENOMEM;
1036
1037 moxaDriver->owner = THIS_MODULE;
1038 moxaDriver->name = "ttyMX";
1039 moxaDriver->major = ttymajor;
1040 moxaDriver->minor_start = 0;
1041 moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1042 moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1043 moxaDriver->init_termios = tty_std_termios;
1044 moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1045 moxaDriver->init_termios.c_ispeed = 9600;
1046 moxaDriver->init_termios.c_ospeed = 9600;
1047 moxaDriver->flags = TTY_DRIVER_REAL_RAW;
1048 tty_set_operations(moxaDriver, &moxa_ops);
1049
1050 if (tty_register_driver(moxaDriver)) {
1051 printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1052 put_tty_driver(moxaDriver);
1053 return -1;
1054 }
1055
1056 /* Find the boards defined from module args. */
1057 #ifdef MODULE
1058 {
1059 struct moxa_board_conf *brd = moxa_boards;
1060 unsigned int i;
1061 for (i = 0; i < MAX_BOARDS; i++) {
1062 if (!baseaddr[i])
1063 break;
1064 if (type[i] == MOXA_BOARD_C218_ISA ||
1065 type[i] == MOXA_BOARD_C320_ISA) {
1066 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1067 isabrds + 1, moxa_brdname[type[i] - 1],
1068 baseaddr[i]);
1069 brd->boardType = type[i];
1070 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1071 numports[i];
1072 brd->busType = MOXA_BUS_TYPE_ISA;
1073 brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1074 if (!brd->basemem) {
1075 printk(KERN_ERR "MOXA: can't remap %lx\n",
1076 baseaddr[i]);
1077 continue;
1078 }
1079 if (moxa_init_board(brd, NULL)) {
1080 iounmap(brd->basemem);
1081 brd->basemem = NULL;
1082 continue;
1083 }
1084
1085 printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1086 "ready (%u ports, firmware loaded)\n",
1087 baseaddr[i], brd->numPorts);
1088
1089 brd++;
1090 isabrds++;
1091 }
1092 }
1093 }
1094 #endif
1095
1096 #ifdef CONFIG_PCI
1097 retval = pci_register_driver(&moxa_pci_driver);
1098 if (retval) {
1099 printk(KERN_ERR "Can't register MOXA pci driver!\n");
1100 if (isabrds)
1101 retval = 0;
1102 }
1103 #endif
1104
1105 return retval;
1106 }
1107
1108 static void __exit moxa_exit(void)
1109 {
1110 unsigned int i;
1111
1112 #ifdef CONFIG_PCI
1113 pci_unregister_driver(&moxa_pci_driver);
1114 #endif
1115
1116 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1117 if (moxa_boards[i].ready)
1118 moxa_board_deinit(&moxa_boards[i]);
1119
1120 del_timer_sync(&moxaTimer);
1121
1122 if (tty_unregister_driver(moxaDriver))
1123 printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1124 "serial driver\n");
1125 put_tty_driver(moxaDriver);
1126 }
1127
1128 module_init(moxa_init);
1129 module_exit(moxa_exit);
1130
1131 static void moxa_shutdown(struct tty_port *port)
1132 {
1133 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1134 MoxaPortDisable(ch);
1135 MoxaPortFlushData(ch, 2);
1136 clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
1137 }
1138
1139 static int moxa_carrier_raised(struct tty_port *port)
1140 {
1141 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1142 int dcd;
1143
1144 spin_lock_bh(&moxa_lock);
1145 dcd = ch->DCDState;
1146 spin_unlock_bh(&moxa_lock);
1147 return dcd;
1148 }
1149
1150 static void moxa_dtr_rts(struct tty_port *port, int onoff)
1151 {
1152 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1153 MoxaPortLineCtrl(ch, onoff, onoff);
1154 }
1155
1156
1157 static int moxa_open(struct tty_struct *tty, struct file *filp)
1158 {
1159 struct moxa_board_conf *brd;
1160 struct moxa_port *ch;
1161 int port;
1162 int retval;
1163
1164 port = tty->index;
1165 if (port == MAX_PORTS) {
1166 return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1167 }
1168 if (mutex_lock_interruptible(&moxa_openlock))
1169 return -ERESTARTSYS;
1170 brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1171 if (!brd->ready) {
1172 mutex_unlock(&moxa_openlock);
1173 return -ENODEV;
1174 }
1175
1176 if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1177 mutex_unlock(&moxa_openlock);
1178 return -ENODEV;
1179 }
1180
1181 ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1182 ch->port.count++;
1183 tty->driver_data = ch;
1184 tty_port_tty_set(&ch->port, tty);
1185 mutex_lock(&ch->port.mutex);
1186 if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1187 ch->statusflags = 0;
1188 moxa_set_tty_param(tty, tty->termios);
1189 MoxaPortLineCtrl(ch, 1, 1);
1190 MoxaPortEnable(ch);
1191 MoxaSetFifo(ch, ch->type == PORT_16550A);
1192 ch->port.flags |= ASYNC_INITIALIZED;
1193 }
1194 mutex_unlock(&ch->port.mutex);
1195 mutex_unlock(&moxa_openlock);
1196
1197 retval = tty_port_block_til_ready(&ch->port, tty, filp);
1198 if (retval == 0)
1199 set_bit(ASYNCB_NORMAL_ACTIVE, &ch->port.flags);
1200 return retval;
1201 }
1202
1203 static void moxa_close(struct tty_struct *tty, struct file *filp)
1204 {
1205 struct moxa_port *ch = tty->driver_data;
1206 ch->cflag = tty->termios->c_cflag;
1207 tty_port_close(&ch->port, tty, filp);
1208 }
1209
1210 static int moxa_write(struct tty_struct *tty,
1211 const unsigned char *buf, int count)
1212 {
1213 struct moxa_port *ch = tty->driver_data;
1214 int len;
1215
1216 if (ch == NULL)
1217 return 0;
1218
1219 spin_lock_bh(&moxa_lock);
1220 len = MoxaPortWriteData(tty, buf, count);
1221 spin_unlock_bh(&moxa_lock);
1222
1223 set_bit(LOWWAIT, &ch->statusflags);
1224 return len;
1225 }
1226
1227 static int moxa_write_room(struct tty_struct *tty)
1228 {
1229 struct moxa_port *ch;
1230
1231 if (tty->stopped)
1232 return 0;
1233 ch = tty->driver_data;
1234 if (ch == NULL)
1235 return 0;
1236 return MoxaPortTxFree(ch);
1237 }
1238
1239 static void moxa_flush_buffer(struct tty_struct *tty)
1240 {
1241 struct moxa_port *ch = tty->driver_data;
1242
1243 if (ch == NULL)
1244 return;
1245 MoxaPortFlushData(ch, 1);
1246 tty_wakeup(tty);
1247 }
1248
1249 static int moxa_chars_in_buffer(struct tty_struct *tty)
1250 {
1251 struct moxa_port *ch = tty->driver_data;
1252 int chars;
1253
1254 lock_kernel();
1255 chars = MoxaPortTxQueue(ch);
1256 if (chars) {
1257 /*
1258 * Make it possible to wakeup anything waiting for output
1259 * in tty_ioctl.c, etc.
1260 */
1261 if (!test_bit(EMPTYWAIT, &ch->statusflags))
1262 moxa_setup_empty_event(tty);
1263 }
1264 unlock_kernel();
1265 return chars;
1266 }
1267
1268 static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
1269 {
1270 struct moxa_port *ch;
1271 int flag = 0, dtr, rts;
1272
1273 mutex_lock(&moxa_openlock);
1274 ch = tty->driver_data;
1275 if (!ch) {
1276 mutex_unlock(&moxa_openlock);
1277 return -EINVAL;
1278 }
1279
1280 MoxaPortGetLineOut(ch, &dtr, &rts);
1281 if (dtr)
1282 flag |= TIOCM_DTR;
1283 if (rts)
1284 flag |= TIOCM_RTS;
1285 dtr = MoxaPortLineStatus(ch);
1286 if (dtr & 1)
1287 flag |= TIOCM_CTS;
1288 if (dtr & 2)
1289 flag |= TIOCM_DSR;
1290 if (dtr & 4)
1291 flag |= TIOCM_CD;
1292 mutex_unlock(&moxa_openlock);
1293 return flag;
1294 }
1295
1296 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
1297 unsigned int set, unsigned int clear)
1298 {
1299 struct moxa_port *ch;
1300 int port;
1301 int dtr, rts;
1302
1303 port = tty->index;
1304 mutex_lock(&moxa_openlock);
1305 ch = tty->driver_data;
1306 if (!ch) {
1307 mutex_unlock(&moxa_openlock);
1308 return -EINVAL;
1309 }
1310
1311 MoxaPortGetLineOut(ch, &dtr, &rts);
1312 if (set & TIOCM_RTS)
1313 rts = 1;
1314 if (set & TIOCM_DTR)
1315 dtr = 1;
1316 if (clear & TIOCM_RTS)
1317 rts = 0;
1318 if (clear & TIOCM_DTR)
1319 dtr = 0;
1320 MoxaPortLineCtrl(ch, dtr, rts);
1321 mutex_unlock(&moxa_openlock);
1322 return 0;
1323 }
1324
1325 static void moxa_set_termios(struct tty_struct *tty,
1326 struct ktermios *old_termios)
1327 {
1328 struct moxa_port *ch = tty->driver_data;
1329
1330 if (ch == NULL)
1331 return;
1332 moxa_set_tty_param(tty, old_termios);
1333 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1334 wake_up_interruptible(&ch->port.open_wait);
1335 }
1336
1337 static void moxa_stop(struct tty_struct *tty)
1338 {
1339 struct moxa_port *ch = tty->driver_data;
1340
1341 if (ch == NULL)
1342 return;
1343 MoxaPortTxDisable(ch);
1344 set_bit(TXSTOPPED, &ch->statusflags);
1345 }
1346
1347
1348 static void moxa_start(struct tty_struct *tty)
1349 {
1350 struct moxa_port *ch = tty->driver_data;
1351
1352 if (ch == NULL)
1353 return;
1354
1355 if (!(ch->statusflags & TXSTOPPED))
1356 return;
1357
1358 MoxaPortTxEnable(ch);
1359 clear_bit(TXSTOPPED, &ch->statusflags);
1360 }
1361
1362 static void moxa_hangup(struct tty_struct *tty)
1363 {
1364 struct moxa_port *ch = tty->driver_data;
1365 tty_port_hangup(&ch->port);
1366 }
1367
1368 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1369 {
1370 struct tty_struct *tty;
1371 dcd = !!dcd;
1372
1373 if (dcd != p->DCDState) {
1374 tty = tty_port_tty_get(&p->port);
1375 if (tty && C_CLOCAL(tty) && !dcd)
1376 tty_hangup(tty);
1377 tty_kref_put(tty);
1378 }
1379 p->DCDState = dcd;
1380 }
1381
1382 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1383 u16 __iomem *ip)
1384 {
1385 struct tty_struct *tty = tty_port_tty_get(&p->port);
1386 void __iomem *ofsAddr;
1387 unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1388 u16 intr;
1389
1390 if (tty) {
1391 if (test_bit(EMPTYWAIT, &p->statusflags) &&
1392 MoxaPortTxQueue(p) == 0) {
1393 clear_bit(EMPTYWAIT, &p->statusflags);
1394 tty_wakeup(tty);
1395 }
1396 if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
1397 MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1398 clear_bit(LOWWAIT, &p->statusflags);
1399 tty_wakeup(tty);
1400 }
1401
1402 if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
1403 MoxaPortRxQueue(p) > 0) { /* RX */
1404 MoxaPortReadData(p);
1405 tty_schedule_flip(tty);
1406 }
1407 } else {
1408 clear_bit(EMPTYWAIT, &p->statusflags);
1409 MoxaPortFlushData(p, 0); /* flush RX */
1410 }
1411
1412 if (!handle) /* nothing else to do */
1413 goto put;
1414
1415 intr = readw(ip); /* port irq status */
1416 if (intr == 0)
1417 goto put;
1418
1419 writew(0, ip); /* ACK port */
1420 ofsAddr = p->tableAddr;
1421 if (intr & IntrTx) /* disable tx intr */
1422 writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1423 ofsAddr + HostStat);
1424
1425 if (!inited)
1426 goto put;
1427
1428 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1429 tty_insert_flip_char(tty, 0, TTY_BREAK);
1430 tty_schedule_flip(tty);
1431 }
1432
1433 if (intr & IntrLine)
1434 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1435 put:
1436 tty_kref_put(tty);
1437
1438 return 0;
1439 }
1440
1441 static void moxa_poll(unsigned long ignored)
1442 {
1443 struct moxa_board_conf *brd;
1444 u16 __iomem *ip;
1445 unsigned int card, port, served = 0;
1446
1447 spin_lock(&moxa_lock);
1448 for (card = 0; card < MAX_BOARDS; card++) {
1449 brd = &moxa_boards[card];
1450 if (!brd->ready)
1451 continue;
1452
1453 served++;
1454
1455 ip = NULL;
1456 if (readb(brd->intPend) == 0xff)
1457 ip = brd->intTable + readb(brd->intNdx);
1458
1459 for (port = 0; port < brd->numPorts; port++)
1460 moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1461
1462 if (ip)
1463 writeb(0, brd->intPend); /* ACK */
1464
1465 if (moxaLowWaterChk) {
1466 struct moxa_port *p = brd->ports;
1467 for (port = 0; port < brd->numPorts; port++, p++)
1468 if (p->lowChkFlag) {
1469 p->lowChkFlag = 0;
1470 moxa_low_water_check(p->tableAddr);
1471 }
1472 }
1473 }
1474 moxaLowWaterChk = 0;
1475
1476 if (served)
1477 mod_timer(&moxaTimer, jiffies + HZ / 50);
1478 spin_unlock(&moxa_lock);
1479 }
1480
1481 /******************************************************************************/
1482
1483 static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1484 {
1485 register struct ktermios *ts = tty->termios;
1486 struct moxa_port *ch = tty->driver_data;
1487 int rts, cts, txflow, rxflow, xany, baud;
1488
1489 rts = cts = txflow = rxflow = xany = 0;
1490 if (ts->c_cflag & CRTSCTS)
1491 rts = cts = 1;
1492 if (ts->c_iflag & IXON)
1493 txflow = 1;
1494 if (ts->c_iflag & IXOFF)
1495 rxflow = 1;
1496 if (ts->c_iflag & IXANY)
1497 xany = 1;
1498
1499 /* Clear the features we don't support */
1500 ts->c_cflag &= ~CMSPAR;
1501 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1502 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1503 if (baud == -1)
1504 baud = tty_termios_baud_rate(old_termios);
1505 /* Not put the baud rate into the termios data */
1506 tty_encode_baud_rate(tty, baud, baud);
1507 }
1508
1509 static void moxa_setup_empty_event(struct tty_struct *tty)
1510 {
1511 struct moxa_port *ch = tty->driver_data;
1512 set_bit(EMPTYWAIT, &ch->statusflags);
1513 }
1514
1515 /*****************************************************************************
1516 * Driver level functions: *
1517 *****************************************************************************/
1518
1519 static void MoxaPortFlushData(struct moxa_port *port, int mode)
1520 {
1521 void __iomem *ofsAddr;
1522 if (mode < 0 || mode > 2)
1523 return;
1524 ofsAddr = port->tableAddr;
1525 moxafunc(ofsAddr, FC_FlushQueue, mode);
1526 if (mode != 1) {
1527 port->lowChkFlag = 0;
1528 moxa_low_water_check(ofsAddr);
1529 }
1530 }
1531
1532 /*
1533 * Moxa Port Number Description:
1534 *
1535 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1536 * the port number using in MOXA driver functions will be 0 to 31 for
1537 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1538 * to 127 for fourth. For example, if you setup three MOXA boards,
1539 * first board is C218, second board is C320-16 and third board is
1540 * C320-32. The port number of first board (C218 - 8 ports) is from
1541 * 0 to 7. The port number of second board (C320 - 16 ports) is form
1542 * 32 to 47. The port number of third board (C320 - 32 ports) is from
1543 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1544 * 127 will be invalid.
1545 *
1546 *
1547 * Moxa Functions Description:
1548 *
1549 * Function 1: Driver initialization routine, this routine must be
1550 * called when initialized driver.
1551 * Syntax:
1552 * void MoxaDriverInit();
1553 *
1554 *
1555 * Function 2: Moxa driver private IOCTL command processing.
1556 * Syntax:
1557 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1558 *
1559 * unsigned int cmd : IOCTL command
1560 * unsigned long arg : IOCTL argument
1561 * int port : port number (0 - 127)
1562 *
1563 * return: 0 (OK)
1564 * -EINVAL
1565 * -ENOIOCTLCMD
1566 *
1567 *
1568 * Function 6: Enable this port to start Tx/Rx data.
1569 * Syntax:
1570 * void MoxaPortEnable(int port);
1571 * int port : port number (0 - 127)
1572 *
1573 *
1574 * Function 7: Disable this port
1575 * Syntax:
1576 * void MoxaPortDisable(int port);
1577 * int port : port number (0 - 127)
1578 *
1579 *
1580 * Function 10: Setting baud rate of this port.
1581 * Syntax:
1582 * speed_t MoxaPortSetBaud(int port, speed_t baud);
1583 * int port : port number (0 - 127)
1584 * long baud : baud rate (50 - 115200)
1585 *
1586 * return: 0 : this port is invalid or baud < 50
1587 * 50 - 115200 : the real baud rate set to the port, if
1588 * the argument baud is large than maximun
1589 * available baud rate, the real setting
1590 * baud rate will be the maximun baud rate.
1591 *
1592 *
1593 * Function 12: Configure the port.
1594 * Syntax:
1595 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1596 * int port : port number (0 - 127)
1597 * struct ktermios * termio : termio structure pointer
1598 * speed_t baud : baud rate
1599 *
1600 * return: -1 : this port is invalid or termio == NULL
1601 * 0 : setting O.K.
1602 *
1603 *
1604 * Function 13: Get the DTR/RTS state of this port.
1605 * Syntax:
1606 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1607 * int port : port number (0 - 127)
1608 * int * dtrState : pointer to INT to receive the current DTR
1609 * state. (if NULL, this function will not
1610 * write to this address)
1611 * int * rtsState : pointer to INT to receive the current RTS
1612 * state. (if NULL, this function will not
1613 * write to this address)
1614 *
1615 * return: -1 : this port is invalid
1616 * 0 : O.K.
1617 *
1618 *
1619 * Function 14: Setting the DTR/RTS output state of this port.
1620 * Syntax:
1621 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1622 * int port : port number (0 - 127)
1623 * int dtrState : DTR output state (0: off, 1: on)
1624 * int rtsState : RTS output state (0: off, 1: on)
1625 *
1626 *
1627 * Function 15: Setting the flow control of this port.
1628 * Syntax:
1629 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1630 * int txFlow,int xany);
1631 * int port : port number (0 - 127)
1632 * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1633 * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1634 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1635 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1636 * int xany : S/W XANY flow control (0: no, 1: yes)
1637 *
1638 *
1639 * Function 16: Get ths line status of this port
1640 * Syntax:
1641 * int MoxaPortLineStatus(int port);
1642 * int port : port number (0 - 127)
1643 *
1644 * return: Bit 0 - CTS state (0: off, 1: on)
1645 * Bit 1 - DSR state (0: off, 1: on)
1646 * Bit 2 - DCD state (0: off, 1: on)
1647 *
1648 *
1649 * Function 19: Flush the Rx/Tx buffer data of this port.
1650 * Syntax:
1651 * void MoxaPortFlushData(int port, int mode);
1652 * int port : port number (0 - 127)
1653 * int mode
1654 * 0 : flush the Rx buffer
1655 * 1 : flush the Tx buffer
1656 * 2 : flush the Rx and Tx buffer
1657 *
1658 *
1659 * Function 20: Write data.
1660 * Syntax:
1661 * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1662 * int port : port number (0 - 127)
1663 * unsigned char * buffer : pointer to write data buffer.
1664 * int length : write data length
1665 *
1666 * return: 0 - length : real write data length
1667 *
1668 *
1669 * Function 21: Read data.
1670 * Syntax:
1671 * int MoxaPortReadData(int port, struct tty_struct *tty);
1672 * int port : port number (0 - 127)
1673 * struct tty_struct *tty : tty for data
1674 *
1675 * return: 0 - length : real read data length
1676 *
1677 *
1678 * Function 24: Get the Tx buffer current queued data bytes
1679 * Syntax:
1680 * int MoxaPortTxQueue(int port);
1681 * int port : port number (0 - 127)
1682 *
1683 * return: .. : Tx buffer current queued data bytes
1684 *
1685 *
1686 * Function 25: Get the Tx buffer current free space
1687 * Syntax:
1688 * int MoxaPortTxFree(int port);
1689 * int port : port number (0 - 127)
1690 *
1691 * return: .. : Tx buffer current free space
1692 *
1693 *
1694 * Function 26: Get the Rx buffer current queued data bytes
1695 * Syntax:
1696 * int MoxaPortRxQueue(int port);
1697 * int port : port number (0 - 127)
1698 *
1699 * return: .. : Rx buffer current queued data bytes
1700 *
1701 *
1702 * Function 28: Disable port data transmission.
1703 * Syntax:
1704 * void MoxaPortTxDisable(int port);
1705 * int port : port number (0 - 127)
1706 *
1707 *
1708 * Function 29: Enable port data transmission.
1709 * Syntax:
1710 * void MoxaPortTxEnable(int port);
1711 * int port : port number (0 - 127)
1712 *
1713 *
1714 * Function 31: Get the received BREAK signal count and reset it.
1715 * Syntax:
1716 * int MoxaPortResetBrkCnt(int port);
1717 * int port : port number (0 - 127)
1718 *
1719 * return: 0 - .. : BREAK signal count
1720 *
1721 *
1722 */
1723
1724 static void MoxaPortEnable(struct moxa_port *port)
1725 {
1726 void __iomem *ofsAddr;
1727 u16 lowwater = 512;
1728
1729 ofsAddr = port->tableAddr;
1730 writew(lowwater, ofsAddr + Low_water);
1731 if (MOXA_IS_320(port->board))
1732 moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1733 else
1734 writew(readw(ofsAddr + HostStat) | WakeupBreak,
1735 ofsAddr + HostStat);
1736
1737 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1738 moxafunc(ofsAddr, FC_FlushQueue, 2);
1739
1740 moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1741 MoxaPortLineStatus(port);
1742 }
1743
1744 static void MoxaPortDisable(struct moxa_port *port)
1745 {
1746 void __iomem *ofsAddr = port->tableAddr;
1747
1748 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1749 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1750 writew(0, ofsAddr + HostStat);
1751 moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1752 }
1753
1754 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1755 {
1756 void __iomem *ofsAddr = port->tableAddr;
1757 unsigned int clock, val;
1758 speed_t max;
1759
1760 max = MOXA_IS_320(port->board) ? 460800 : 921600;
1761 if (baud < 50)
1762 return 0;
1763 if (baud > max)
1764 baud = max;
1765 clock = 921600;
1766 val = clock / baud;
1767 moxafunc(ofsAddr, FC_SetBaud, val);
1768 baud = clock / val;
1769 return baud;
1770 }
1771
1772 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1773 speed_t baud)
1774 {
1775 void __iomem *ofsAddr;
1776 tcflag_t cflag;
1777 tcflag_t mode = 0;
1778
1779 ofsAddr = port->tableAddr;
1780 cflag = termio->c_cflag; /* termio->c_cflag */
1781
1782 mode = termio->c_cflag & CSIZE;
1783 if (mode == CS5)
1784 mode = MX_CS5;
1785 else if (mode == CS6)
1786 mode = MX_CS6;
1787 else if (mode == CS7)
1788 mode = MX_CS7;
1789 else if (mode == CS8)
1790 mode = MX_CS8;
1791
1792 if (termio->c_cflag & CSTOPB) {
1793 if (mode == MX_CS5)
1794 mode |= MX_STOP15;
1795 else
1796 mode |= MX_STOP2;
1797 } else
1798 mode |= MX_STOP1;
1799
1800 if (termio->c_cflag & PARENB) {
1801 if (termio->c_cflag & PARODD)
1802 mode |= MX_PARODD;
1803 else
1804 mode |= MX_PAREVEN;
1805 } else
1806 mode |= MX_PARNONE;
1807
1808 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1809
1810 if (MOXA_IS_320(port->board) && baud >= 921600)
1811 return -1;
1812
1813 baud = MoxaPortSetBaud(port, baud);
1814
1815 if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1816 spin_lock_irq(&moxafunc_lock);
1817 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1818 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1819 writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1820 moxa_wait_finish(ofsAddr);
1821 spin_unlock_irq(&moxafunc_lock);
1822
1823 }
1824 return baud;
1825 }
1826
1827 static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1828 int *rtsState)
1829 {
1830 if (dtrState)
1831 *dtrState = !!(port->lineCtrl & DTR_ON);
1832 if (rtsState)
1833 *rtsState = !!(port->lineCtrl & RTS_ON);
1834
1835 return 0;
1836 }
1837
1838 static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1839 {
1840 u8 mode = 0;
1841
1842 if (dtr)
1843 mode |= DTR_ON;
1844 if (rts)
1845 mode |= RTS_ON;
1846 port->lineCtrl = mode;
1847 moxafunc(port->tableAddr, FC_LineControl, mode);
1848 }
1849
1850 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1851 int txflow, int rxflow, int txany)
1852 {
1853 int mode = 0;
1854
1855 if (rts)
1856 mode |= RTS_FlowCtl;
1857 if (cts)
1858 mode |= CTS_FlowCtl;
1859 if (txflow)
1860 mode |= Tx_FlowCtl;
1861 if (rxflow)
1862 mode |= Rx_FlowCtl;
1863 if (txany)
1864 mode |= IXM_IXANY;
1865 moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1866 }
1867
1868 static int MoxaPortLineStatus(struct moxa_port *port)
1869 {
1870 void __iomem *ofsAddr;
1871 int val;
1872
1873 ofsAddr = port->tableAddr;
1874 if (MOXA_IS_320(port->board))
1875 val = moxafuncret(ofsAddr, FC_LineStatus, 0);
1876 else
1877 val = readw(ofsAddr + FlagStat) >> 4;
1878 val &= 0x0B;
1879 if (val & 8)
1880 val |= 4;
1881 spin_lock_bh(&moxa_lock);
1882 moxa_new_dcdstate(port, val & 8);
1883 spin_unlock_bh(&moxa_lock);
1884 val &= 7;
1885 return val;
1886 }
1887
1888 static int MoxaPortWriteData(struct tty_struct *tty,
1889 const unsigned char *buffer, int len)
1890 {
1891 struct moxa_port *port = tty->driver_data;
1892 void __iomem *baseAddr, *ofsAddr, *ofs;
1893 unsigned int c, total;
1894 u16 head, tail, tx_mask, spage, epage;
1895 u16 pageno, pageofs, bufhead;
1896
1897 ofsAddr = port->tableAddr;
1898 baseAddr = port->board->basemem;
1899 tx_mask = readw(ofsAddr + TX_mask);
1900 spage = readw(ofsAddr + Page_txb);
1901 epage = readw(ofsAddr + EndPage_txb);
1902 tail = readw(ofsAddr + TXwptr);
1903 head = readw(ofsAddr + TXrptr);
1904 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1905 if (c > len)
1906 c = len;
1907 moxaLog.txcnt[port->port.tty->index] += c;
1908 total = c;
1909 if (spage == epage) {
1910 bufhead = readw(ofsAddr + Ofs_txb);
1911 writew(spage, baseAddr + Control_reg);
1912 while (c > 0) {
1913 if (head > tail)
1914 len = head - tail - 1;
1915 else
1916 len = tx_mask + 1 - tail;
1917 len = (c > len) ? len : c;
1918 ofs = baseAddr + DynPage_addr + bufhead + tail;
1919 memcpy_toio(ofs, buffer, len);
1920 buffer += len;
1921 tail = (tail + len) & tx_mask;
1922 c -= len;
1923 }
1924 } else {
1925 pageno = spage + (tail >> 13);
1926 pageofs = tail & Page_mask;
1927 while (c > 0) {
1928 len = Page_size - pageofs;
1929 if (len > c)
1930 len = c;
1931 writeb(pageno, baseAddr + Control_reg);
1932 ofs = baseAddr + DynPage_addr + pageofs;
1933 memcpy_toio(ofs, buffer, len);
1934 buffer += len;
1935 if (++pageno == epage)
1936 pageno = spage;
1937 pageofs = 0;
1938 c -= len;
1939 }
1940 tail = (tail + total) & tx_mask;
1941 }
1942 writew(tail, ofsAddr + TXwptr);
1943 writeb(1, ofsAddr + CD180TXirq); /* start to send */
1944 return total;
1945 }
1946
1947 static int MoxaPortReadData(struct moxa_port *port)
1948 {
1949 struct tty_struct *tty = port->port.tty;
1950 unsigned char *dst;
1951 void __iomem *baseAddr, *ofsAddr, *ofs;
1952 unsigned int count, len, total;
1953 u16 tail, rx_mask, spage, epage;
1954 u16 pageno, pageofs, bufhead, head;
1955
1956 ofsAddr = port->tableAddr;
1957 baseAddr = port->board->basemem;
1958 head = readw(ofsAddr + RXrptr);
1959 tail = readw(ofsAddr + RXwptr);
1960 rx_mask = readw(ofsAddr + RX_mask);
1961 spage = readw(ofsAddr + Page_rxb);
1962 epage = readw(ofsAddr + EndPage_rxb);
1963 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
1964 if (count == 0)
1965 return 0;
1966
1967 total = count;
1968 moxaLog.rxcnt[tty->index] += total;
1969 if (spage == epage) {
1970 bufhead = readw(ofsAddr + Ofs_rxb);
1971 writew(spage, baseAddr + Control_reg);
1972 while (count > 0) {
1973 ofs = baseAddr + DynPage_addr + bufhead + head;
1974 len = (tail >= head) ? (tail - head) :
1975 (rx_mask + 1 - head);
1976 len = tty_prepare_flip_string(tty, &dst,
1977 min(len, count));
1978 memcpy_fromio(dst, ofs, len);
1979 head = (head + len) & rx_mask;
1980 count -= len;
1981 }
1982 } else {
1983 pageno = spage + (head >> 13);
1984 pageofs = head & Page_mask;
1985 while (count > 0) {
1986 writew(pageno, baseAddr + Control_reg);
1987 ofs = baseAddr + DynPage_addr + pageofs;
1988 len = tty_prepare_flip_string(tty, &dst,
1989 min(Page_size - pageofs, count));
1990 memcpy_fromio(dst, ofs, len);
1991
1992 count -= len;
1993 pageofs = (pageofs + len) & Page_mask;
1994 if (pageofs == 0 && ++pageno == epage)
1995 pageno = spage;
1996 }
1997 head = (head + total) & rx_mask;
1998 }
1999 writew(head, ofsAddr + RXrptr);
2000 if (readb(ofsAddr + FlagStat) & Xoff_state) {
2001 moxaLowWaterChk = 1;
2002 port->lowChkFlag = 1;
2003 }
2004 return total;
2005 }
2006
2007
2008 static int MoxaPortTxQueue(struct moxa_port *port)
2009 {
2010 void __iomem *ofsAddr = port->tableAddr;
2011 u16 rptr, wptr, mask;
2012
2013 rptr = readw(ofsAddr + TXrptr);
2014 wptr = readw(ofsAddr + TXwptr);
2015 mask = readw(ofsAddr + TX_mask);
2016 return (wptr - rptr) & mask;
2017 }
2018
2019 static int MoxaPortTxFree(struct moxa_port *port)
2020 {
2021 void __iomem *ofsAddr = port->tableAddr;
2022 u16 rptr, wptr, mask;
2023
2024 rptr = readw(ofsAddr + TXrptr);
2025 wptr = readw(ofsAddr + TXwptr);
2026 mask = readw(ofsAddr + TX_mask);
2027 return mask - ((wptr - rptr) & mask);
2028 }
2029
2030 static int MoxaPortRxQueue(struct moxa_port *port)
2031 {
2032 void __iomem *ofsAddr = port->tableAddr;
2033 u16 rptr, wptr, mask;
2034
2035 rptr = readw(ofsAddr + RXrptr);
2036 wptr = readw(ofsAddr + RXwptr);
2037 mask = readw(ofsAddr + RX_mask);
2038 return (wptr - rptr) & mask;
2039 }
2040
2041 static void MoxaPortTxDisable(struct moxa_port *port)
2042 {
2043 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2044 }
2045
2046 static void MoxaPortTxEnable(struct moxa_port *port)
2047 {
2048 moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2049 }
2050
2051 static int moxa_get_serial_info(struct moxa_port *info,
2052 struct serial_struct __user *retinfo)
2053 {
2054 struct serial_struct tmp = {
2055 .type = info->type,
2056 .line = info->port.tty->index,
2057 .flags = info->port.flags,
2058 .baud_base = 921600,
2059 .close_delay = info->port.close_delay
2060 };
2061 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2062 }
2063
2064
2065 static int moxa_set_serial_info(struct moxa_port *info,
2066 struct serial_struct __user *new_info)
2067 {
2068 struct serial_struct new_serial;
2069
2070 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2071 return -EFAULT;
2072
2073 if (new_serial.irq != 0 || new_serial.port != 0 ||
2074 new_serial.custom_divisor != 0 ||
2075 new_serial.baud_base != 921600)
2076 return -EPERM;
2077
2078 if (!capable(CAP_SYS_ADMIN)) {
2079 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2080 (info->port.flags & ~ASYNC_USR_MASK)))
2081 return -EPERM;
2082 } else
2083 info->port.close_delay = new_serial.close_delay * HZ / 100;
2084
2085 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2086 new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2087
2088 MoxaSetFifo(info, new_serial.type == PORT_16550A);
2089
2090 info->type = new_serial.type;
2091 return 0;
2092 }
2093
2094
2095
2096 /*****************************************************************************
2097 * Static local functions: *
2098 *****************************************************************************/
2099
2100 static void MoxaSetFifo(struct moxa_port *port, int enable)
2101 {
2102 void __iomem *ofsAddr = port->tableAddr;
2103
2104 if (!enable) {
2105 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2106 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2107 } else {
2108 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2109 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2110 }
2111 }
Linux kernel - Deliverables
This page took 0.094159 seconds and 6 git commands to generate.