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TTY: moxa, convert to dynamic device
[deliverable/linux.git] / drivers / tty / 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/string.h>
38 #include <linux/fcntl.h>
39 #include <linux/ptrace.h>
40 #include <linux/serial.h>
41 #include <linux/tty_driver.h>
42 #include <linux/delay.h>
43 #include <linux/pci.h>
44 #include <linux/init.h>
45 #include <linux/bitops.h>
46 #include <linux/slab.h>
47 #include <linux/ratelimit.h>
48
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; /* Protected by the port lock */
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 static DEFINE_SPINLOCK(moxa_lock);
168
169 static unsigned long baseaddr[MAX_BOARDS];
170 static unsigned int type[MAX_BOARDS];
171 static unsigned int numports[MAX_BOARDS];
172 static struct tty_port moxa_service_port;
173
174 MODULE_AUTHOR("William Chen");
175 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
176 MODULE_LICENSE("GPL");
177 MODULE_FIRMWARE("c218tunx.cod");
178 MODULE_FIRMWARE("cp204unx.cod");
179 MODULE_FIRMWARE("c320tunx.cod");
180
181 module_param_array(type, uint, NULL, 0);
182 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
183 module_param_array(baseaddr, ulong, NULL, 0);
184 MODULE_PARM_DESC(baseaddr, "base address");
185 module_param_array(numports, uint, NULL, 0);
186 MODULE_PARM_DESC(numports, "numports (ignored for C218)");
187
188 module_param(ttymajor, int, 0);
189
190 /*
191 * static functions:
192 */
193 static int moxa_open(struct tty_struct *, struct file *);
194 static void moxa_close(struct tty_struct *, struct file *);
195 static int moxa_write(struct tty_struct *, const unsigned char *, int);
196 static int moxa_write_room(struct tty_struct *);
197 static void moxa_flush_buffer(struct tty_struct *);
198 static int moxa_chars_in_buffer(struct tty_struct *);
199 static void moxa_set_termios(struct tty_struct *, struct ktermios *);
200 static void moxa_stop(struct tty_struct *);
201 static void moxa_start(struct tty_struct *);
202 static void moxa_hangup(struct tty_struct *);
203 static int moxa_tiocmget(struct tty_struct *tty);
204 static int moxa_tiocmset(struct tty_struct *tty,
205 unsigned int set, unsigned int clear);
206 static void moxa_poll(unsigned long);
207 static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
208 static void moxa_shutdown(struct tty_port *);
209 static int moxa_carrier_raised(struct tty_port *);
210 static void moxa_dtr_rts(struct tty_port *, int);
211 /*
212 * moxa board interface functions:
213 */
214 static void MoxaPortEnable(struct moxa_port *);
215 static void MoxaPortDisable(struct moxa_port *);
216 static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
217 static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
218 static void MoxaPortLineCtrl(struct moxa_port *, int, int);
219 static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
220 static int MoxaPortLineStatus(struct moxa_port *);
221 static void MoxaPortFlushData(struct moxa_port *, int);
222 static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
223 static int MoxaPortReadData(struct moxa_port *);
224 static int MoxaPortTxQueue(struct moxa_port *);
225 static int MoxaPortRxQueue(struct moxa_port *);
226 static int MoxaPortTxFree(struct moxa_port *);
227 static void MoxaPortTxDisable(struct moxa_port *);
228 static void MoxaPortTxEnable(struct moxa_port *);
229 static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
230 static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
231 static void MoxaSetFifo(struct moxa_port *port, int enable);
232
233 /*
234 * I/O functions
235 */
236
237 static DEFINE_SPINLOCK(moxafunc_lock);
238
239 static void moxa_wait_finish(void __iomem *ofsAddr)
240 {
241 unsigned long end = jiffies + moxaFuncTout;
242
243 while (readw(ofsAddr + FuncCode) != 0)
244 if (time_after(jiffies, end))
245 return;
246 if (readw(ofsAddr + FuncCode) != 0)
247 printk_ratelimited(KERN_WARNING "moxa function expired\n");
248 }
249
250 static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
251 {
252 unsigned long flags;
253 spin_lock_irqsave(&moxafunc_lock, flags);
254 writew(arg, ofsAddr + FuncArg);
255 writew(cmd, ofsAddr + FuncCode);
256 moxa_wait_finish(ofsAddr);
257 spin_unlock_irqrestore(&moxafunc_lock, flags);
258 }
259
260 static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
261 {
262 unsigned long flags;
263 u16 ret;
264 spin_lock_irqsave(&moxafunc_lock, flags);
265 writew(arg, ofsAddr + FuncArg);
266 writew(cmd, ofsAddr + FuncCode);
267 moxa_wait_finish(ofsAddr);
268 ret = readw(ofsAddr + FuncArg);
269 spin_unlock_irqrestore(&moxafunc_lock, flags);
270 return ret;
271 }
272
273 static void moxa_low_water_check(void __iomem *ofsAddr)
274 {
275 u16 rptr, wptr, mask, len;
276
277 if (readb(ofsAddr + FlagStat) & Xoff_state) {
278 rptr = readw(ofsAddr + RXrptr);
279 wptr = readw(ofsAddr + RXwptr);
280 mask = readw(ofsAddr + RX_mask);
281 len = (wptr - rptr) & mask;
282 if (len <= Low_water)
283 moxafunc(ofsAddr, FC_SendXon, 0);
284 }
285 }
286
287 /*
288 * TTY operations
289 */
290
291 static int moxa_ioctl(struct tty_struct *tty,
292 unsigned int cmd, unsigned long arg)
293 {
294 struct moxa_port *ch = tty->driver_data;
295 void __user *argp = (void __user *)arg;
296 int status, ret = 0;
297
298 if (tty->index == MAX_PORTS) {
299 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
300 cmd != MOXA_GETMSTATUS)
301 return -EINVAL;
302 } else if (!ch)
303 return -ENODEV;
304
305 switch (cmd) {
306 case MOXA_GETDATACOUNT:
307 moxaLog.tick = jiffies;
308 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
309 ret = -EFAULT;
310 break;
311 case MOXA_FLUSH_QUEUE:
312 MoxaPortFlushData(ch, arg);
313 break;
314 case MOXA_GET_IOQUEUE: {
315 struct moxaq_str __user *argm = argp;
316 struct moxaq_str tmp;
317 struct moxa_port *p;
318 unsigned int i, j;
319
320 for (i = 0; i < MAX_BOARDS; i++) {
321 p = moxa_boards[i].ports;
322 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
323 memset(&tmp, 0, sizeof(tmp));
324 spin_lock_bh(&moxa_lock);
325 if (moxa_boards[i].ready) {
326 tmp.inq = MoxaPortRxQueue(p);
327 tmp.outq = MoxaPortTxQueue(p);
328 }
329 spin_unlock_bh(&moxa_lock);
330 if (copy_to_user(argm, &tmp, sizeof(tmp)))
331 return -EFAULT;
332 }
333 }
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 for (i = 0; i < MAX_BOARDS; i++) {
350 p = moxa_boards[i].ports;
351 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
352 struct tty_struct *ttyp;
353 memset(&tmp, 0, sizeof(tmp));
354 spin_lock_bh(&moxa_lock);
355 if (!moxa_boards[i].ready) {
356 spin_unlock_bh(&moxa_lock);
357 goto copy;
358 }
359
360 status = MoxaPortLineStatus(p);
361 spin_unlock_bh(&moxa_lock);
362
363 if (status & 1)
364 tmp.cts = 1;
365 if (status & 2)
366 tmp.dsr = 1;
367 if (status & 4)
368 tmp.dcd = 1;
369
370 ttyp = tty_port_tty_get(&p->port);
371 if (!ttyp)
372 tmp.cflag = p->cflag;
373 else
374 tmp.cflag = ttyp->termios.c_cflag;
375 tty_kref_put(ttyp);
376 copy:
377 if (copy_to_user(argm, &tmp, sizeof(tmp)))
378 return -EFAULT;
379 }
380 }
381 break;
382 }
383 case TIOCGSERIAL:
384 mutex_lock(&ch->port.mutex);
385 ret = moxa_get_serial_info(ch, argp);
386 mutex_unlock(&ch->port.mutex);
387 break;
388 case TIOCSSERIAL:
389 mutex_lock(&ch->port.mutex);
390 ret = moxa_set_serial_info(ch, argp);
391 mutex_unlock(&ch->port.mutex);
392 break;
393 default:
394 ret = -ENOIOCTLCMD;
395 }
396 return ret;
397 }
398
399 static int moxa_break_ctl(struct tty_struct *tty, int state)
400 {
401 struct moxa_port *port = tty->driver_data;
402
403 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
404 Magic_code);
405 return 0;
406 }
407
408 static const struct tty_operations moxa_ops = {
409 .open = moxa_open,
410 .close = moxa_close,
411 .write = moxa_write,
412 .write_room = moxa_write_room,
413 .flush_buffer = moxa_flush_buffer,
414 .chars_in_buffer = moxa_chars_in_buffer,
415 .ioctl = moxa_ioctl,
416 .set_termios = moxa_set_termios,
417 .stop = moxa_stop,
418 .start = moxa_start,
419 .hangup = moxa_hangup,
420 .break_ctl = moxa_break_ctl,
421 .tiocmget = moxa_tiocmget,
422 .tiocmset = moxa_tiocmset,
423 };
424
425 static const struct tty_port_operations moxa_port_ops = {
426 .carrier_raised = moxa_carrier_raised,
427 .dtr_rts = moxa_dtr_rts,
428 .shutdown = moxa_shutdown,
429 };
430
431 static struct tty_driver *moxaDriver;
432 static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
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, first_idx;
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 first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
892 for (i = 0; i < brd->numPorts; i++)
893 tty_port_register_device(&brd->ports[i].port, moxaDriver,
894 first_idx + i, dev);
895
896 return 0;
897 err_free:
898 kfree(brd->ports);
899 err:
900 return ret;
901 }
902
903 static void moxa_board_deinit(struct moxa_board_conf *brd)
904 {
905 unsigned int a, opened, first_idx;
906
907 mutex_lock(&moxa_openlock);
908 spin_lock_bh(&moxa_lock);
909 brd->ready = 0;
910 spin_unlock_bh(&moxa_lock);
911
912 /* pci hot-un-plug support */
913 for (a = 0; a < brd->numPorts; a++)
914 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
915 struct tty_struct *tty = tty_port_tty_get(
916 &brd->ports[a].port);
917 if (tty) {
918 tty_hangup(tty);
919 tty_kref_put(tty);
920 }
921 }
922 while (1) {
923 opened = 0;
924 for (a = 0; a < brd->numPorts; a++)
925 if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
926 opened++;
927 mutex_unlock(&moxa_openlock);
928 if (!opened)
929 break;
930 msleep(50);
931 mutex_lock(&moxa_openlock);
932 }
933
934 first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
935 for (a = 0; a < brd->numPorts; a++)
936 tty_unregister_device(moxaDriver, first_idx + a);
937
938 iounmap(brd->basemem);
939 brd->basemem = NULL;
940 kfree(brd->ports);
941 }
942
943 #ifdef CONFIG_PCI
944 static int __devinit moxa_pci_probe(struct pci_dev *pdev,
945 const struct pci_device_id *ent)
946 {
947 struct moxa_board_conf *board;
948 unsigned int i;
949 int board_type = ent->driver_data;
950 int retval;
951
952 retval = pci_enable_device(pdev);
953 if (retval) {
954 dev_err(&pdev->dev, "can't enable pci device\n");
955 goto err;
956 }
957
958 for (i = 0; i < MAX_BOARDS; i++)
959 if (moxa_boards[i].basemem == NULL)
960 break;
961
962 retval = -ENODEV;
963 if (i >= MAX_BOARDS) {
964 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
965 "found. Board is ignored.\n", MAX_BOARDS);
966 goto err;
967 }
968
969 board = &moxa_boards[i];
970
971 retval = pci_request_region(pdev, 2, "moxa-base");
972 if (retval) {
973 dev_err(&pdev->dev, "can't request pci region 2\n");
974 goto err;
975 }
976
977 board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
978 if (board->basemem == NULL) {
979 dev_err(&pdev->dev, "can't remap io space 2\n");
980 goto err_reg;
981 }
982
983 board->boardType = board_type;
984 switch (board_type) {
985 case MOXA_BOARD_C218_ISA:
986 case MOXA_BOARD_C218_PCI:
987 board->numPorts = 8;
988 break;
989
990 case MOXA_BOARD_CP204J:
991 board->numPorts = 4;
992 break;
993 default:
994 board->numPorts = 0;
995 break;
996 }
997 board->busType = MOXA_BUS_TYPE_PCI;
998
999 retval = moxa_init_board(board, &pdev->dev);
1000 if (retval)
1001 goto err_base;
1002
1003 pci_set_drvdata(pdev, board);
1004
1005 dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
1006 moxa_brdname[board_type - 1], board->numPorts);
1007
1008 return 0;
1009 err_base:
1010 iounmap(board->basemem);
1011 board->basemem = NULL;
1012 err_reg:
1013 pci_release_region(pdev, 2);
1014 err:
1015 return retval;
1016 }
1017
1018 static void __devexit moxa_pci_remove(struct pci_dev *pdev)
1019 {
1020 struct moxa_board_conf *brd = pci_get_drvdata(pdev);
1021
1022 moxa_board_deinit(brd);
1023
1024 pci_release_region(pdev, 2);
1025 }
1026
1027 static struct pci_driver moxa_pci_driver = {
1028 .name = "moxa",
1029 .id_table = moxa_pcibrds,
1030 .probe = moxa_pci_probe,
1031 .remove = __devexit_p(moxa_pci_remove)
1032 };
1033 #endif /* CONFIG_PCI */
1034
1035 static int __init moxa_init(void)
1036 {
1037 unsigned int isabrds = 0;
1038 int retval = 0;
1039 struct moxa_board_conf *brd = moxa_boards;
1040 unsigned int i;
1041
1042 printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1043 MOXA_VERSION);
1044
1045 tty_port_init(&moxa_service_port);
1046
1047 moxaDriver = tty_alloc_driver(MAX_PORTS + 1,
1048 TTY_DRIVER_REAL_RAW |
1049 TTY_DRIVER_DYNAMIC_DEV);
1050 if (!moxaDriver)
1051 return -ENOMEM;
1052
1053 moxaDriver->name = "ttyMX";
1054 moxaDriver->major = ttymajor;
1055 moxaDriver->minor_start = 0;
1056 moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1057 moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1058 moxaDriver->init_termios = tty_std_termios;
1059 moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1060 moxaDriver->init_termios.c_ispeed = 9600;
1061 moxaDriver->init_termios.c_ospeed = 9600;
1062 tty_set_operations(moxaDriver, &moxa_ops);
1063 /* Having one more port only for ioctls is ugly */
1064 tty_port_link_device(&moxa_service_port, moxaDriver, MAX_PORTS);
1065
1066 if (tty_register_driver(moxaDriver)) {
1067 printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1068 put_tty_driver(moxaDriver);
1069 return -1;
1070 }
1071
1072 /* Find the boards defined from module args. */
1073
1074 for (i = 0; i < MAX_BOARDS; i++) {
1075 if (!baseaddr[i])
1076 break;
1077 if (type[i] == MOXA_BOARD_C218_ISA ||
1078 type[i] == MOXA_BOARD_C320_ISA) {
1079 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1080 isabrds + 1, moxa_brdname[type[i] - 1],
1081 baseaddr[i]);
1082 brd->boardType = type[i];
1083 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1084 numports[i];
1085 brd->busType = MOXA_BUS_TYPE_ISA;
1086 brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1087 if (!brd->basemem) {
1088 printk(KERN_ERR "MOXA: can't remap %lx\n",
1089 baseaddr[i]);
1090 continue;
1091 }
1092 if (moxa_init_board(brd, NULL)) {
1093 iounmap(brd->basemem);
1094 brd->basemem = NULL;
1095 continue;
1096 }
1097
1098 printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1099 "ready (%u ports, firmware loaded)\n",
1100 baseaddr[i], brd->numPorts);
1101
1102 brd++;
1103 isabrds++;
1104 }
1105 }
1106
1107 #ifdef CONFIG_PCI
1108 retval = pci_register_driver(&moxa_pci_driver);
1109 if (retval) {
1110 printk(KERN_ERR "Can't register MOXA pci driver!\n");
1111 if (isabrds)
1112 retval = 0;
1113 }
1114 #endif
1115
1116 return retval;
1117 }
1118
1119 static void __exit moxa_exit(void)
1120 {
1121 unsigned int i;
1122
1123 #ifdef CONFIG_PCI
1124 pci_unregister_driver(&moxa_pci_driver);
1125 #endif
1126
1127 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1128 if (moxa_boards[i].ready)
1129 moxa_board_deinit(&moxa_boards[i]);
1130
1131 del_timer_sync(&moxaTimer);
1132
1133 if (tty_unregister_driver(moxaDriver))
1134 printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1135 "serial driver\n");
1136 put_tty_driver(moxaDriver);
1137 }
1138
1139 module_init(moxa_init);
1140 module_exit(moxa_exit);
1141
1142 static void moxa_shutdown(struct tty_port *port)
1143 {
1144 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1145 MoxaPortDisable(ch);
1146 MoxaPortFlushData(ch, 2);
1147 }
1148
1149 static int moxa_carrier_raised(struct tty_port *port)
1150 {
1151 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1152 int dcd;
1153
1154 spin_lock_irq(&port->lock);
1155 dcd = ch->DCDState;
1156 spin_unlock_irq(&port->lock);
1157 return dcd;
1158 }
1159
1160 static void moxa_dtr_rts(struct tty_port *port, int onoff)
1161 {
1162 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1163 MoxaPortLineCtrl(ch, onoff, onoff);
1164 }
1165
1166
1167 static int moxa_open(struct tty_struct *tty, struct file *filp)
1168 {
1169 struct moxa_board_conf *brd;
1170 struct moxa_port *ch;
1171 int port;
1172
1173 port = tty->index;
1174 if (port == MAX_PORTS) {
1175 return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1176 }
1177 if (mutex_lock_interruptible(&moxa_openlock))
1178 return -ERESTARTSYS;
1179 brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1180 if (!brd->ready) {
1181 mutex_unlock(&moxa_openlock);
1182 return -ENODEV;
1183 }
1184
1185 if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1186 mutex_unlock(&moxa_openlock);
1187 return -ENODEV;
1188 }
1189
1190 ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1191 ch->port.count++;
1192 tty->driver_data = ch;
1193 tty_port_tty_set(&ch->port, tty);
1194 mutex_lock(&ch->port.mutex);
1195 if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1196 ch->statusflags = 0;
1197 moxa_set_tty_param(tty, &tty->termios);
1198 MoxaPortLineCtrl(ch, 1, 1);
1199 MoxaPortEnable(ch);
1200 MoxaSetFifo(ch, ch->type == PORT_16550A);
1201 ch->port.flags |= ASYNC_INITIALIZED;
1202 }
1203 mutex_unlock(&ch->port.mutex);
1204 mutex_unlock(&moxa_openlock);
1205
1206 return tty_port_block_til_ready(&ch->port, tty, filp);
1207 }
1208
1209 static void moxa_close(struct tty_struct *tty, struct file *filp)
1210 {
1211 struct moxa_port *ch = tty->driver_data;
1212 ch->cflag = tty->termios.c_cflag;
1213 tty_port_close(&ch->port, tty, filp);
1214 }
1215
1216 static int moxa_write(struct tty_struct *tty,
1217 const unsigned char *buf, int count)
1218 {
1219 struct moxa_port *ch = tty->driver_data;
1220 unsigned long flags;
1221 int len;
1222
1223 if (ch == NULL)
1224 return 0;
1225
1226 spin_lock_irqsave(&moxa_lock, flags);
1227 len = MoxaPortWriteData(tty, buf, count);
1228 spin_unlock_irqrestore(&moxa_lock, flags);
1229
1230 set_bit(LOWWAIT, &ch->statusflags);
1231 return len;
1232 }
1233
1234 static int moxa_write_room(struct tty_struct *tty)
1235 {
1236 struct moxa_port *ch;
1237
1238 if (tty->stopped)
1239 return 0;
1240 ch = tty->driver_data;
1241 if (ch == NULL)
1242 return 0;
1243 return MoxaPortTxFree(ch);
1244 }
1245
1246 static void moxa_flush_buffer(struct tty_struct *tty)
1247 {
1248 struct moxa_port *ch = tty->driver_data;
1249
1250 if (ch == NULL)
1251 return;
1252 MoxaPortFlushData(ch, 1);
1253 tty_wakeup(tty);
1254 }
1255
1256 static int moxa_chars_in_buffer(struct tty_struct *tty)
1257 {
1258 struct moxa_port *ch = tty->driver_data;
1259 int chars;
1260
1261 chars = MoxaPortTxQueue(ch);
1262 if (chars)
1263 /*
1264 * Make it possible to wakeup anything waiting for output
1265 * in tty_ioctl.c, etc.
1266 */
1267 set_bit(EMPTYWAIT, &ch->statusflags);
1268 return chars;
1269 }
1270
1271 static int moxa_tiocmget(struct tty_struct *tty)
1272 {
1273 struct moxa_port *ch = tty->driver_data;
1274 int flag = 0, dtr, rts;
1275
1276 MoxaPortGetLineOut(ch, &dtr, &rts);
1277 if (dtr)
1278 flag |= TIOCM_DTR;
1279 if (rts)
1280 flag |= TIOCM_RTS;
1281 dtr = MoxaPortLineStatus(ch);
1282 if (dtr & 1)
1283 flag |= TIOCM_CTS;
1284 if (dtr & 2)
1285 flag |= TIOCM_DSR;
1286 if (dtr & 4)
1287 flag |= TIOCM_CD;
1288 return flag;
1289 }
1290
1291 static int moxa_tiocmset(struct tty_struct *tty,
1292 unsigned int set, unsigned int clear)
1293 {
1294 struct moxa_port *ch;
1295 int dtr, rts;
1296
1297 mutex_lock(&moxa_openlock);
1298 ch = tty->driver_data;
1299 if (!ch) {
1300 mutex_unlock(&moxa_openlock);
1301 return -EINVAL;
1302 }
1303
1304 MoxaPortGetLineOut(ch, &dtr, &rts);
1305 if (set & TIOCM_RTS)
1306 rts = 1;
1307 if (set & TIOCM_DTR)
1308 dtr = 1;
1309 if (clear & TIOCM_RTS)
1310 rts = 0;
1311 if (clear & TIOCM_DTR)
1312 dtr = 0;
1313 MoxaPortLineCtrl(ch, dtr, rts);
1314 mutex_unlock(&moxa_openlock);
1315 return 0;
1316 }
1317
1318 static void moxa_set_termios(struct tty_struct *tty,
1319 struct ktermios *old_termios)
1320 {
1321 struct moxa_port *ch = tty->driver_data;
1322
1323 if (ch == NULL)
1324 return;
1325 moxa_set_tty_param(tty, old_termios);
1326 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1327 wake_up_interruptible(&ch->port.open_wait);
1328 }
1329
1330 static void moxa_stop(struct tty_struct *tty)
1331 {
1332 struct moxa_port *ch = tty->driver_data;
1333
1334 if (ch == NULL)
1335 return;
1336 MoxaPortTxDisable(ch);
1337 set_bit(TXSTOPPED, &ch->statusflags);
1338 }
1339
1340
1341 static void moxa_start(struct tty_struct *tty)
1342 {
1343 struct moxa_port *ch = tty->driver_data;
1344
1345 if (ch == NULL)
1346 return;
1347
1348 if (!test_bit(TXSTOPPED, &ch->statusflags))
1349 return;
1350
1351 MoxaPortTxEnable(ch);
1352 clear_bit(TXSTOPPED, &ch->statusflags);
1353 }
1354
1355 static void moxa_hangup(struct tty_struct *tty)
1356 {
1357 struct moxa_port *ch = tty->driver_data;
1358 tty_port_hangup(&ch->port);
1359 }
1360
1361 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1362 {
1363 struct tty_struct *tty;
1364 unsigned long flags;
1365 dcd = !!dcd;
1366
1367 spin_lock_irqsave(&p->port.lock, flags);
1368 if (dcd != p->DCDState) {
1369 p->DCDState = dcd;
1370 spin_unlock_irqrestore(&p->port.lock, flags);
1371 tty = tty_port_tty_get(&p->port);
1372 if (tty && C_CLOCAL(tty) && !dcd)
1373 tty_hangup(tty);
1374 tty_kref_put(tty);
1375 }
1376 else
1377 spin_unlock_irqrestore(&p->port.lock, flags);
1378 }
1379
1380 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1381 u16 __iomem *ip)
1382 {
1383 struct tty_struct *tty = tty_port_tty_get(&p->port);
1384 void __iomem *ofsAddr;
1385 unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1386 u16 intr;
1387
1388 if (tty) {
1389 if (test_bit(EMPTYWAIT, &p->statusflags) &&
1390 MoxaPortTxQueue(p) == 0) {
1391 clear_bit(EMPTYWAIT, &p->statusflags);
1392 tty_wakeup(tty);
1393 }
1394 if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
1395 MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1396 clear_bit(LOWWAIT, &p->statusflags);
1397 tty_wakeup(tty);
1398 }
1399
1400 if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
1401 MoxaPortRxQueue(p) > 0) { /* RX */
1402 MoxaPortReadData(p);
1403 tty_schedule_flip(tty);
1404 }
1405 } else {
1406 clear_bit(EMPTYWAIT, &p->statusflags);
1407 MoxaPortFlushData(p, 0); /* flush RX */
1408 }
1409
1410 if (!handle) /* nothing else to do */
1411 goto put;
1412
1413 intr = readw(ip); /* port irq status */
1414 if (intr == 0)
1415 goto put;
1416
1417 writew(0, ip); /* ACK port */
1418 ofsAddr = p->tableAddr;
1419 if (intr & IntrTx) /* disable tx intr */
1420 writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1421 ofsAddr + HostStat);
1422
1423 if (!inited)
1424 goto put;
1425
1426 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1427 tty_insert_flip_char(tty, 0, TTY_BREAK);
1428 tty_schedule_flip(tty);
1429 }
1430
1431 if (intr & IntrLine)
1432 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1433 put:
1434 tty_kref_put(tty);
1435
1436 return 0;
1437 }
1438
1439 static void moxa_poll(unsigned long ignored)
1440 {
1441 struct moxa_board_conf *brd;
1442 u16 __iomem *ip;
1443 unsigned int card, port, served = 0;
1444
1445 spin_lock(&moxa_lock);
1446 for (card = 0; card < MAX_BOARDS; card++) {
1447 brd = &moxa_boards[card];
1448 if (!brd->ready)
1449 continue;
1450
1451 served++;
1452
1453 ip = NULL;
1454 if (readb(brd->intPend) == 0xff)
1455 ip = brd->intTable + readb(brd->intNdx);
1456
1457 for (port = 0; port < brd->numPorts; port++)
1458 moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1459
1460 if (ip)
1461 writeb(0, brd->intPend); /* ACK */
1462
1463 if (moxaLowWaterChk) {
1464 struct moxa_port *p = brd->ports;
1465 for (port = 0; port < brd->numPorts; port++, p++)
1466 if (p->lowChkFlag) {
1467 p->lowChkFlag = 0;
1468 moxa_low_water_check(p->tableAddr);
1469 }
1470 }
1471 }
1472 moxaLowWaterChk = 0;
1473
1474 if (served)
1475 mod_timer(&moxaTimer, jiffies + HZ / 50);
1476 spin_unlock(&moxa_lock);
1477 }
1478
1479 /******************************************************************************/
1480
1481 static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1482 {
1483 register struct ktermios *ts = &tty->termios;
1484 struct moxa_port *ch = tty->driver_data;
1485 int rts, cts, txflow, rxflow, xany, baud;
1486
1487 rts = cts = txflow = rxflow = xany = 0;
1488 if (ts->c_cflag & CRTSCTS)
1489 rts = cts = 1;
1490 if (ts->c_iflag & IXON)
1491 txflow = 1;
1492 if (ts->c_iflag & IXOFF)
1493 rxflow = 1;
1494 if (ts->c_iflag & IXANY)
1495 xany = 1;
1496
1497 /* Clear the features we don't support */
1498 ts->c_cflag &= ~CMSPAR;
1499 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1500 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1501 if (baud == -1)
1502 baud = tty_termios_baud_rate(old_termios);
1503 /* Not put the baud rate into the termios data */
1504 tty_encode_baud_rate(tty, baud, baud);
1505 }
1506
1507 /*****************************************************************************
1508 * Driver level functions: *
1509 *****************************************************************************/
1510
1511 static void MoxaPortFlushData(struct moxa_port *port, int mode)
1512 {
1513 void __iomem *ofsAddr;
1514 if (mode < 0 || mode > 2)
1515 return;
1516 ofsAddr = port->tableAddr;
1517 moxafunc(ofsAddr, FC_FlushQueue, mode);
1518 if (mode != 1) {
1519 port->lowChkFlag = 0;
1520 moxa_low_water_check(ofsAddr);
1521 }
1522 }
1523
1524 /*
1525 * Moxa Port Number Description:
1526 *
1527 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1528 * the port number using in MOXA driver functions will be 0 to 31 for
1529 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1530 * to 127 for fourth. For example, if you setup three MOXA boards,
1531 * first board is C218, second board is C320-16 and third board is
1532 * C320-32. The port number of first board (C218 - 8 ports) is from
1533 * 0 to 7. The port number of second board (C320 - 16 ports) is form
1534 * 32 to 47. The port number of third board (C320 - 32 ports) is from
1535 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1536 * 127 will be invalid.
1537 *
1538 *
1539 * Moxa Functions Description:
1540 *
1541 * Function 1: Driver initialization routine, this routine must be
1542 * called when initialized driver.
1543 * Syntax:
1544 * void MoxaDriverInit();
1545 *
1546 *
1547 * Function 2: Moxa driver private IOCTL command processing.
1548 * Syntax:
1549 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1550 *
1551 * unsigned int cmd : IOCTL command
1552 * unsigned long arg : IOCTL argument
1553 * int port : port number (0 - 127)
1554 *
1555 * return: 0 (OK)
1556 * -EINVAL
1557 * -ENOIOCTLCMD
1558 *
1559 *
1560 * Function 6: Enable this port to start Tx/Rx data.
1561 * Syntax:
1562 * void MoxaPortEnable(int port);
1563 * int port : port number (0 - 127)
1564 *
1565 *
1566 * Function 7: Disable this port
1567 * Syntax:
1568 * void MoxaPortDisable(int port);
1569 * int port : port number (0 - 127)
1570 *
1571 *
1572 * Function 10: Setting baud rate of this port.
1573 * Syntax:
1574 * speed_t MoxaPortSetBaud(int port, speed_t baud);
1575 * int port : port number (0 - 127)
1576 * long baud : baud rate (50 - 115200)
1577 *
1578 * return: 0 : this port is invalid or baud < 50
1579 * 50 - 115200 : the real baud rate set to the port, if
1580 * the argument baud is large than maximun
1581 * available baud rate, the real setting
1582 * baud rate will be the maximun baud rate.
1583 *
1584 *
1585 * Function 12: Configure the port.
1586 * Syntax:
1587 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1588 * int port : port number (0 - 127)
1589 * struct ktermios * termio : termio structure pointer
1590 * speed_t baud : baud rate
1591 *
1592 * return: -1 : this port is invalid or termio == NULL
1593 * 0 : setting O.K.
1594 *
1595 *
1596 * Function 13: Get the DTR/RTS state of this port.
1597 * Syntax:
1598 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1599 * int port : port number (0 - 127)
1600 * int * dtrState : pointer to INT to receive the current DTR
1601 * state. (if NULL, this function will not
1602 * write to this address)
1603 * int * rtsState : pointer to INT to receive the current RTS
1604 * state. (if NULL, this function will not
1605 * write to this address)
1606 *
1607 * return: -1 : this port is invalid
1608 * 0 : O.K.
1609 *
1610 *
1611 * Function 14: Setting the DTR/RTS output state of this port.
1612 * Syntax:
1613 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1614 * int port : port number (0 - 127)
1615 * int dtrState : DTR output state (0: off, 1: on)
1616 * int rtsState : RTS output state (0: off, 1: on)
1617 *
1618 *
1619 * Function 15: Setting the flow control of this port.
1620 * Syntax:
1621 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1622 * int txFlow,int xany);
1623 * int port : port number (0 - 127)
1624 * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1625 * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1626 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1627 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1628 * int xany : S/W XANY flow control (0: no, 1: yes)
1629 *
1630 *
1631 * Function 16: Get ths line status of this port
1632 * Syntax:
1633 * int MoxaPortLineStatus(int port);
1634 * int port : port number (0 - 127)
1635 *
1636 * return: Bit 0 - CTS state (0: off, 1: on)
1637 * Bit 1 - DSR state (0: off, 1: on)
1638 * Bit 2 - DCD state (0: off, 1: on)
1639 *
1640 *
1641 * Function 19: Flush the Rx/Tx buffer data of this port.
1642 * Syntax:
1643 * void MoxaPortFlushData(int port, int mode);
1644 * int port : port number (0 - 127)
1645 * int mode
1646 * 0 : flush the Rx buffer
1647 * 1 : flush the Tx buffer
1648 * 2 : flush the Rx and Tx buffer
1649 *
1650 *
1651 * Function 20: Write data.
1652 * Syntax:
1653 * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1654 * int port : port number (0 - 127)
1655 * unsigned char * buffer : pointer to write data buffer.
1656 * int length : write data length
1657 *
1658 * return: 0 - length : real write data length
1659 *
1660 *
1661 * Function 21: Read data.
1662 * Syntax:
1663 * int MoxaPortReadData(int port, struct tty_struct *tty);
1664 * int port : port number (0 - 127)
1665 * struct tty_struct *tty : tty for data
1666 *
1667 * return: 0 - length : real read data length
1668 *
1669 *
1670 * Function 24: Get the Tx buffer current queued data bytes
1671 * Syntax:
1672 * int MoxaPortTxQueue(int port);
1673 * int port : port number (0 - 127)
1674 *
1675 * return: .. : Tx buffer current queued data bytes
1676 *
1677 *
1678 * Function 25: Get the Tx buffer current free space
1679 * Syntax:
1680 * int MoxaPortTxFree(int port);
1681 * int port : port number (0 - 127)
1682 *
1683 * return: .. : Tx buffer current free space
1684 *
1685 *
1686 * Function 26: Get the Rx buffer current queued data bytes
1687 * Syntax:
1688 * int MoxaPortRxQueue(int port);
1689 * int port : port number (0 - 127)
1690 *
1691 * return: .. : Rx buffer current queued data bytes
1692 *
1693 *
1694 * Function 28: Disable port data transmission.
1695 * Syntax:
1696 * void MoxaPortTxDisable(int port);
1697 * int port : port number (0 - 127)
1698 *
1699 *
1700 * Function 29: Enable port data transmission.
1701 * Syntax:
1702 * void MoxaPortTxEnable(int port);
1703 * int port : port number (0 - 127)
1704 *
1705 *
1706 * Function 31: Get the received BREAK signal count and reset it.
1707 * Syntax:
1708 * int MoxaPortResetBrkCnt(int port);
1709 * int port : port number (0 - 127)
1710 *
1711 * return: 0 - .. : BREAK signal count
1712 *
1713 *
1714 */
1715
1716 static void MoxaPortEnable(struct moxa_port *port)
1717 {
1718 void __iomem *ofsAddr;
1719 u16 lowwater = 512;
1720
1721 ofsAddr = port->tableAddr;
1722 writew(lowwater, ofsAddr + Low_water);
1723 if (MOXA_IS_320(port->board))
1724 moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1725 else
1726 writew(readw(ofsAddr + HostStat) | WakeupBreak,
1727 ofsAddr + HostStat);
1728
1729 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1730 moxafunc(ofsAddr, FC_FlushQueue, 2);
1731
1732 moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1733 MoxaPortLineStatus(port);
1734 }
1735
1736 static void MoxaPortDisable(struct moxa_port *port)
1737 {
1738 void __iomem *ofsAddr = port->tableAddr;
1739
1740 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1741 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1742 writew(0, ofsAddr + HostStat);
1743 moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1744 }
1745
1746 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1747 {
1748 void __iomem *ofsAddr = port->tableAddr;
1749 unsigned int clock, val;
1750 speed_t max;
1751
1752 max = MOXA_IS_320(port->board) ? 460800 : 921600;
1753 if (baud < 50)
1754 return 0;
1755 if (baud > max)
1756 baud = max;
1757 clock = 921600;
1758 val = clock / baud;
1759 moxafunc(ofsAddr, FC_SetBaud, val);
1760 baud = clock / val;
1761 return baud;
1762 }
1763
1764 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1765 speed_t baud)
1766 {
1767 void __iomem *ofsAddr;
1768 tcflag_t mode = 0;
1769
1770 ofsAddr = port->tableAddr;
1771
1772 mode = termio->c_cflag & CSIZE;
1773 if (mode == CS5)
1774 mode = MX_CS5;
1775 else if (mode == CS6)
1776 mode = MX_CS6;
1777 else if (mode == CS7)
1778 mode = MX_CS7;
1779 else if (mode == CS8)
1780 mode = MX_CS8;
1781
1782 if (termio->c_cflag & CSTOPB) {
1783 if (mode == MX_CS5)
1784 mode |= MX_STOP15;
1785 else
1786 mode |= MX_STOP2;
1787 } else
1788 mode |= MX_STOP1;
1789
1790 if (termio->c_cflag & PARENB) {
1791 if (termio->c_cflag & PARODD)
1792 mode |= MX_PARODD;
1793 else
1794 mode |= MX_PAREVEN;
1795 } else
1796 mode |= MX_PARNONE;
1797
1798 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1799
1800 if (MOXA_IS_320(port->board) && baud >= 921600)
1801 return -1;
1802
1803 baud = MoxaPortSetBaud(port, baud);
1804
1805 if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1806 spin_lock_irq(&moxafunc_lock);
1807 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1808 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1809 writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1810 moxa_wait_finish(ofsAddr);
1811 spin_unlock_irq(&moxafunc_lock);
1812
1813 }
1814 return baud;
1815 }
1816
1817 static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1818 int *rtsState)
1819 {
1820 if (dtrState)
1821 *dtrState = !!(port->lineCtrl & DTR_ON);
1822 if (rtsState)
1823 *rtsState = !!(port->lineCtrl & RTS_ON);
1824
1825 return 0;
1826 }
1827
1828 static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1829 {
1830 u8 mode = 0;
1831
1832 if (dtr)
1833 mode |= DTR_ON;
1834 if (rts)
1835 mode |= RTS_ON;
1836 port->lineCtrl = mode;
1837 moxafunc(port->tableAddr, FC_LineControl, mode);
1838 }
1839
1840 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1841 int txflow, int rxflow, int txany)
1842 {
1843 int mode = 0;
1844
1845 if (rts)
1846 mode |= RTS_FlowCtl;
1847 if (cts)
1848 mode |= CTS_FlowCtl;
1849 if (txflow)
1850 mode |= Tx_FlowCtl;
1851 if (rxflow)
1852 mode |= Rx_FlowCtl;
1853 if (txany)
1854 mode |= IXM_IXANY;
1855 moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1856 }
1857
1858 static int MoxaPortLineStatus(struct moxa_port *port)
1859 {
1860 void __iomem *ofsAddr;
1861 int val;
1862
1863 ofsAddr = port->tableAddr;
1864 if (MOXA_IS_320(port->board))
1865 val = moxafuncret(ofsAddr, FC_LineStatus, 0);
1866 else
1867 val = readw(ofsAddr + FlagStat) >> 4;
1868 val &= 0x0B;
1869 if (val & 8)
1870 val |= 4;
1871 moxa_new_dcdstate(port, val & 8);
1872 val &= 7;
1873 return val;
1874 }
1875
1876 static int MoxaPortWriteData(struct tty_struct *tty,
1877 const unsigned char *buffer, int len)
1878 {
1879 struct moxa_port *port = tty->driver_data;
1880 void __iomem *baseAddr, *ofsAddr, *ofs;
1881 unsigned int c, total;
1882 u16 head, tail, tx_mask, spage, epage;
1883 u16 pageno, pageofs, bufhead;
1884
1885 ofsAddr = port->tableAddr;
1886 baseAddr = port->board->basemem;
1887 tx_mask = readw(ofsAddr + TX_mask);
1888 spage = readw(ofsAddr + Page_txb);
1889 epage = readw(ofsAddr + EndPage_txb);
1890 tail = readw(ofsAddr + TXwptr);
1891 head = readw(ofsAddr + TXrptr);
1892 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1893 if (c > len)
1894 c = len;
1895 moxaLog.txcnt[port->port.tty->index] += c;
1896 total = c;
1897 if (spage == epage) {
1898 bufhead = readw(ofsAddr + Ofs_txb);
1899 writew(spage, baseAddr + Control_reg);
1900 while (c > 0) {
1901 if (head > tail)
1902 len = head - tail - 1;
1903 else
1904 len = tx_mask + 1 - tail;
1905 len = (c > len) ? len : c;
1906 ofs = baseAddr + DynPage_addr + bufhead + tail;
1907 memcpy_toio(ofs, buffer, len);
1908 buffer += len;
1909 tail = (tail + len) & tx_mask;
1910 c -= len;
1911 }
1912 } else {
1913 pageno = spage + (tail >> 13);
1914 pageofs = tail & Page_mask;
1915 while (c > 0) {
1916 len = Page_size - pageofs;
1917 if (len > c)
1918 len = c;
1919 writeb(pageno, baseAddr + Control_reg);
1920 ofs = baseAddr + DynPage_addr + pageofs;
1921 memcpy_toio(ofs, buffer, len);
1922 buffer += len;
1923 if (++pageno == epage)
1924 pageno = spage;
1925 pageofs = 0;
1926 c -= len;
1927 }
1928 tail = (tail + total) & tx_mask;
1929 }
1930 writew(tail, ofsAddr + TXwptr);
1931 writeb(1, ofsAddr + CD180TXirq); /* start to send */
1932 return total;
1933 }
1934
1935 static int MoxaPortReadData(struct moxa_port *port)
1936 {
1937 struct tty_struct *tty = port->port.tty;
1938 unsigned char *dst;
1939 void __iomem *baseAddr, *ofsAddr, *ofs;
1940 unsigned int count, len, total;
1941 u16 tail, rx_mask, spage, epage;
1942 u16 pageno, pageofs, bufhead, head;
1943
1944 ofsAddr = port->tableAddr;
1945 baseAddr = port->board->basemem;
1946 head = readw(ofsAddr + RXrptr);
1947 tail = readw(ofsAddr + RXwptr);
1948 rx_mask = readw(ofsAddr + RX_mask);
1949 spage = readw(ofsAddr + Page_rxb);
1950 epage = readw(ofsAddr + EndPage_rxb);
1951 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
1952 if (count == 0)
1953 return 0;
1954
1955 total = count;
1956 moxaLog.rxcnt[tty->index] += total;
1957 if (spage == epage) {
1958 bufhead = readw(ofsAddr + Ofs_rxb);
1959 writew(spage, baseAddr + Control_reg);
1960 while (count > 0) {
1961 ofs = baseAddr + DynPage_addr + bufhead + head;
1962 len = (tail >= head) ? (tail - head) :
1963 (rx_mask + 1 - head);
1964 len = tty_prepare_flip_string(tty, &dst,
1965 min(len, count));
1966 memcpy_fromio(dst, ofs, len);
1967 head = (head + len) & rx_mask;
1968 count -= len;
1969 }
1970 } else {
1971 pageno = spage + (head >> 13);
1972 pageofs = head & Page_mask;
1973 while (count > 0) {
1974 writew(pageno, baseAddr + Control_reg);
1975 ofs = baseAddr + DynPage_addr + pageofs;
1976 len = tty_prepare_flip_string(tty, &dst,
1977 min(Page_size - pageofs, count));
1978 memcpy_fromio(dst, ofs, len);
1979
1980 count -= len;
1981 pageofs = (pageofs + len) & Page_mask;
1982 if (pageofs == 0 && ++pageno == epage)
1983 pageno = spage;
1984 }
1985 head = (head + total) & rx_mask;
1986 }
1987 writew(head, ofsAddr + RXrptr);
1988 if (readb(ofsAddr + FlagStat) & Xoff_state) {
1989 moxaLowWaterChk = 1;
1990 port->lowChkFlag = 1;
1991 }
1992 return total;
1993 }
1994
1995
1996 static int MoxaPortTxQueue(struct moxa_port *port)
1997 {
1998 void __iomem *ofsAddr = port->tableAddr;
1999 u16 rptr, wptr, mask;
2000
2001 rptr = readw(ofsAddr + TXrptr);
2002 wptr = readw(ofsAddr + TXwptr);
2003 mask = readw(ofsAddr + TX_mask);
2004 return (wptr - rptr) & mask;
2005 }
2006
2007 static int MoxaPortTxFree(struct moxa_port *port)
2008 {
2009 void __iomem *ofsAddr = port->tableAddr;
2010 u16 rptr, wptr, mask;
2011
2012 rptr = readw(ofsAddr + TXrptr);
2013 wptr = readw(ofsAddr + TXwptr);
2014 mask = readw(ofsAddr + TX_mask);
2015 return mask - ((wptr - rptr) & mask);
2016 }
2017
2018 static int MoxaPortRxQueue(struct moxa_port *port)
2019 {
2020 void __iomem *ofsAddr = port->tableAddr;
2021 u16 rptr, wptr, mask;
2022
2023 rptr = readw(ofsAddr + RXrptr);
2024 wptr = readw(ofsAddr + RXwptr);
2025 mask = readw(ofsAddr + RX_mask);
2026 return (wptr - rptr) & mask;
2027 }
2028
2029 static void MoxaPortTxDisable(struct moxa_port *port)
2030 {
2031 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2032 }
2033
2034 static void MoxaPortTxEnable(struct moxa_port *port)
2035 {
2036 moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2037 }
2038
2039 static int moxa_get_serial_info(struct moxa_port *info,
2040 struct serial_struct __user *retinfo)
2041 {
2042 struct serial_struct tmp = {
2043 .type = info->type,
2044 .line = info->port.tty->index,
2045 .flags = info->port.flags,
2046 .baud_base = 921600,
2047 .close_delay = info->port.close_delay
2048 };
2049 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2050 }
2051
2052
2053 static int moxa_set_serial_info(struct moxa_port *info,
2054 struct serial_struct __user *new_info)
2055 {
2056 struct serial_struct new_serial;
2057
2058 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2059 return -EFAULT;
2060
2061 if (new_serial.irq != 0 || new_serial.port != 0 ||
2062 new_serial.custom_divisor != 0 ||
2063 new_serial.baud_base != 921600)
2064 return -EPERM;
2065
2066 if (!capable(CAP_SYS_ADMIN)) {
2067 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2068 (info->port.flags & ~ASYNC_USR_MASK)))
2069 return -EPERM;
2070 } else
2071 info->port.close_delay = new_serial.close_delay * HZ / 100;
2072
2073 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2074 new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2075
2076 MoxaSetFifo(info, new_serial.type == PORT_16550A);
2077
2078 info->type = new_serial.type;
2079 return 0;
2080 }
2081
2082
2083
2084 /*****************************************************************************
2085 * Static local functions: *
2086 *****************************************************************************/
2087
2088 static void MoxaSetFifo(struct moxa_port *port, int enable)
2089 {
2090 void __iomem *ofsAddr = port->tableAddr;
2091
2092 if (!enable) {
2093 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2094 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2095 } else {
2096 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2097 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2098 }
2099 }
Linux kernel - Deliverables
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