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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / char / moxa.c
blob166495d6a1d7dc8acea02b934b3c8c87c0de875b
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
47 #include <asm/system.h>
48 #include <asm/io.h>
49 #include <asm/uaccess.h>
50
51 #include "moxa.h"
52
53 #define MOXA_VERSION "6.0k"
54
55 #define MOXA_FW_HDRLEN 32
56
57 #define MOXAMAJOR 172
58
59 #define MAX_BOARDS 4 /* Don't change this value */
60 #define MAX_PORTS_PER_BOARD 32 /* Don't change this value */
61 #define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD)
62
63 #define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
64 (brd)->boardType == MOXA_BOARD_C320_PCI)
65
66 /*
67 * Define the Moxa PCI vendor and device IDs.
68 */
69 #define MOXA_BUS_TYPE_ISA 0
70 #define MOXA_BUS_TYPE_PCI 1
71
72 enum {
73 MOXA_BOARD_C218_PCI = 1,
74 MOXA_BOARD_C218_ISA,
75 MOXA_BOARD_C320_PCI,
76 MOXA_BOARD_C320_ISA,
77 MOXA_BOARD_CP204J,
78 };
79
80 static char *moxa_brdname[] =
81 {
82 "C218 Turbo PCI series",
83 "C218 Turbo ISA series",
84 "C320 Turbo PCI series",
85 "C320 Turbo ISA series",
86 "CP-204J series",
87 };
88
89 #ifdef CONFIG_PCI
90 static struct pci_device_id moxa_pcibrds[] = {
91 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
92 .driver_data = MOXA_BOARD_C218_PCI },
93 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
94 .driver_data = MOXA_BOARD_C320_PCI },
95 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
96 .driver_data = MOXA_BOARD_CP204J },
97 { 0 }
98 };
99 MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
100 #endif /* CONFIG_PCI */
101
102 struct moxa_port;
103
104 static struct moxa_board_conf {
105 int boardType;
106 int numPorts;
107 int busType;
108
109 unsigned int ready;
110
111 struct moxa_port *ports;
112
113 void __iomem *basemem;
114 void __iomem *intNdx;
115 void __iomem *intPend;
116 void __iomem *intTable;
117 } moxa_boards[MAX_BOARDS];
118
119 struct mxser_mstatus {
120 tcflag_t cflag;
121 int cts;
122 int dsr;
123 int ri;
124 int dcd;
125 };
126
127 struct moxaq_str {
128 int inq;
129 int outq;
130 };
131
132 struct moxa_port {
133 struct tty_port port;
134 struct moxa_board_conf *board;
135 void __iomem *tableAddr;
136
137 int type;
138 int cflag;
139 unsigned long statusflags;
140
141 u8 DCDState; /* Protected by the port lock */
142 u8 lineCtrl;
143 u8 lowChkFlag;
144 };
145
146 struct mon_str {
147 int tick;
148 int rxcnt[MAX_PORTS];
149 int txcnt[MAX_PORTS];
150 };
151
152 /* statusflags */
153 #define TXSTOPPED 1
154 #define LOWWAIT 2
155 #define EMPTYWAIT 3
156
157 #define SERIAL_DO_RESTART
158
159 #define WAKEUP_CHARS 256
160
161 static int ttymajor = MOXAMAJOR;
162 static struct mon_str moxaLog;
163 static unsigned int moxaFuncTout = HZ / 2;
164 static unsigned int moxaLowWaterChk;
165 static DEFINE_MUTEX(moxa_openlock);
166 static DEFINE_SPINLOCK(moxa_lock);
167
168 static unsigned long baseaddr[MAX_BOARDS];
169 static unsigned int type[MAX_BOARDS];
170 static unsigned int numports[MAX_BOARDS];
171
172 MODULE_AUTHOR("William Chen");
173 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
174 MODULE_LICENSE("GPL");
175 MODULE_FIRMWARE("c218tunx.cod");
176 MODULE_FIRMWARE("cp204unx.cod");
177 MODULE_FIRMWARE("c320tunx.cod");
178
179 module_param_array(type, uint, NULL, 0);
180 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
181 module_param_array(baseaddr, ulong, NULL, 0);
182 MODULE_PARM_DESC(baseaddr, "base address");
183 module_param_array(numports, uint, NULL, 0);
184 MODULE_PARM_DESC(numports, "numports (ignored for C218)");
185
186 module_param(ttymajor, int, 0);
187
188 /*
189 * static functions:
190 */
191 static int moxa_open(struct tty_struct *, struct file *);
192 static void moxa_close(struct tty_struct *, struct file *);
193 static int moxa_write(struct tty_struct *, const unsigned char *, int);
194 static int moxa_write_room(struct tty_struct *);
195 static void moxa_flush_buffer(struct tty_struct *);
196 static int moxa_chars_in_buffer(struct tty_struct *);
197 static void moxa_set_termios(struct tty_struct *, struct ktermios *);
198 static void moxa_stop(struct tty_struct *);
199 static void moxa_start(struct tty_struct *);
200 static void moxa_hangup(struct tty_struct *);
201 static int moxa_tiocmget(struct tty_struct *tty, struct file *file);
202 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
203 unsigned int set, unsigned int clear);
204 static void moxa_poll(unsigned long);
205 static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
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 for (i = 0; i < MAX_BOARDS; i++) {
319 p = moxa_boards[i].ports;
320 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
321 memset(&tmp, 0, sizeof(tmp));
322 spin_lock_bh(&moxa_lock);
323 if (moxa_boards[i].ready) {
324 tmp.inq = MoxaPortRxQueue(p);
325 tmp.outq = MoxaPortTxQueue(p);
326 }
327 spin_unlock_bh(&moxa_lock);
328 if (copy_to_user(argm, &tmp, sizeof(tmp)))
329 return -EFAULT;
330 }
331 }
332 break;
333 } case MOXA_GET_OQUEUE:
334 status = MoxaPortTxQueue(ch);
335 ret = put_user(status, (unsigned long __user *)argp);
336 break;
337 case MOXA_GET_IQUEUE:
338 status = MoxaPortRxQueue(ch);
339 ret = put_user(status, (unsigned long __user *)argp);
340 break;
341 case MOXA_GETMSTATUS: {
342 struct mxser_mstatus __user *argm = argp;
343 struct mxser_mstatus tmp;
344 struct moxa_port *p;
345 unsigned int i, j;
346
347 for (i = 0; i < MAX_BOARDS; i++) {
348 p = moxa_boards[i].ports;
349 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
350 struct tty_struct *ttyp;
351 memset(&tmp, 0, sizeof(tmp));
352 spin_lock_bh(&moxa_lock);
353 if (!moxa_boards[i].ready) {
354 spin_unlock_bh(&moxa_lock);
355 goto copy;
356 }
357
358 status = MoxaPortLineStatus(p);
359 spin_unlock_bh(&moxa_lock);
360
361 if (status & 1)
362 tmp.cts = 1;
363 if (status & 2)
364 tmp.dsr = 1;
365 if (status & 4)
366 tmp.dcd = 1;
367
368 ttyp = tty_port_tty_get(&p->port);
369 if (!ttyp || !ttyp->termios)
370 tmp.cflag = p->cflag;
371 else
372 tmp.cflag = ttyp->termios->c_cflag;
373 tty_kref_put(tty);
374 copy:
375 if (copy_to_user(argm, &tmp, sizeof(tmp)))
376 return -EFAULT;
377 }
378 }
379 break;
380 }
381 case TIOCGSERIAL:
382 mutex_lock(&ch->port.mutex);
383 ret = moxa_get_serial_info(ch, argp);
384 mutex_unlock(&ch->port.mutex);
385 break;
386 case TIOCSSERIAL:
387 mutex_lock(&ch->port.mutex);
388 ret = moxa_set_serial_info(ch, argp);
389 mutex_unlock(&ch->port.mutex);
390 break;
391 default:
392 ret = -ENOIOCTLCMD;
393 }
394 return ret;
395 }
396
397 static int moxa_break_ctl(struct tty_struct *tty, int state)
398 {
399 struct moxa_port *port = tty->driver_data;
400
401 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
402 Magic_code);
403 return 0;
404 }
405
406 static const struct tty_operations moxa_ops = {
407 .open = moxa_open,
408 .close = moxa_close,
409 .write = moxa_write,
410 .write_room = moxa_write_room,
411 .flush_buffer = moxa_flush_buffer,
412 .chars_in_buffer = moxa_chars_in_buffer,
413 .ioctl = moxa_ioctl,
414 .set_termios = moxa_set_termios,
415 .stop = moxa_stop,
416 .start = moxa_start,
417 .hangup = moxa_hangup,
418 .break_ctl = moxa_break_ctl,
419 .tiocmget = moxa_tiocmget,
420 .tiocmset = moxa_tiocmset,
421 };
422
423 static const struct tty_port_operations moxa_port_ops = {
424 .carrier_raised = moxa_carrier_raised,
425 .dtr_rts = moxa_dtr_rts,
426 .shutdown = moxa_shutdown,
427 };
428
429 static struct tty_driver *moxaDriver;
430 static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
431
432 /*
433 * HW init
434 */
435
436 static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
437 {
438 switch (brd->boardType) {
439 case MOXA_BOARD_C218_ISA:
440 case MOXA_BOARD_C218_PCI:
441 if (model != 1)
442 goto err;
443 break;
444 case MOXA_BOARD_CP204J:
445 if (model != 3)
446 goto err;
447 break;
448 default:
449 if (model != 2)
450 goto err;
451 break;
452 }
453 return 0;
454 err:
455 return -EINVAL;
456 }
457
458 static int moxa_check_fw(const void *ptr)
459 {
460 const __le16 *lptr = ptr;
461
462 if (*lptr != cpu_to_le16(0x7980))
463 return -EINVAL;
464
465 return 0;
466 }
467
468 static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
469 size_t len)
470 {
471 void __iomem *baseAddr = brd->basemem;
472 u16 tmp;
473
474 writeb(HW_reset, baseAddr + Control_reg); /* reset */
475 msleep(10);
476 memset_io(baseAddr, 0, 4096);
477 memcpy_toio(baseAddr, buf, len); /* download BIOS */
478 writeb(0, baseAddr + Control_reg); /* restart */
479
480 msleep(2000);
481
482 switch (brd->boardType) {
483 case MOXA_BOARD_C218_ISA:
484 case MOXA_BOARD_C218_PCI:
485 tmp = readw(baseAddr + C218_key);
486 if (tmp != C218_KeyCode)
487 goto err;
488 break;
489 case MOXA_BOARD_CP204J:
490 tmp = readw(baseAddr + C218_key);
491 if (tmp != CP204J_KeyCode)
492 goto err;
493 break;
494 default:
495 tmp = readw(baseAddr + C320_key);
496 if (tmp != C320_KeyCode)
497 goto err;
498 tmp = readw(baseAddr + C320_status);
499 if (tmp != STS_init) {
500 printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
501 "module not found\n");
502 return -EIO;
503 }
504 break;
505 }
506
507 return 0;
508 err:
509 printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
510 return -EIO;
511 }
512
513 static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
514 size_t len)
515 {
516 void __iomem *baseAddr = brd->basemem;
517
518 if (len < 7168) {
519 printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
520 return -EINVAL;
521 }
522
523 writew(len - 7168 - 2, baseAddr + C320bapi_len);
524 writeb(1, baseAddr + Control_reg); /* Select Page 1 */
525 memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
526 writeb(2, baseAddr + Control_reg); /* Select Page 2 */
527 memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
528
529 return 0;
530 }
531
532 static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
533 size_t len)
534 {
535 void __iomem *baseAddr = brd->basemem;
536 const __le16 *uptr = ptr;
537 size_t wlen, len2, j;
538 unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
539 unsigned int i, retry;
540 u16 usum, keycode;
541
542 keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
543 C218_KeyCode;
544
545 switch (brd->boardType) {
546 case MOXA_BOARD_CP204J:
547 case MOXA_BOARD_C218_ISA:
548 case MOXA_BOARD_C218_PCI:
549 key = C218_key;
550 loadbuf = C218_LoadBuf;
551 loadlen = C218DLoad_len;
552 checksum = C218check_sum;
553 checksum_ok = C218chksum_ok;
554 break;
555 default:
556 key = C320_key;
557 keycode = C320_KeyCode;
558 loadbuf = C320_LoadBuf;
559 loadlen = C320DLoad_len;
560 checksum = C320check_sum;
561 checksum_ok = C320chksum_ok;
562 break;
563 }
564
565 usum = 0;
566 wlen = len >> 1;
567 for (i = 0; i < wlen; i++)
568 usum += le16_to_cpu(uptr[i]);
569 retry = 0;
570 do {
571 wlen = len >> 1;
572 j = 0;
573 while (wlen) {
574 len2 = (wlen > 2048) ? 2048 : wlen;
575 wlen -= len2;
576 memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
577 j += len2 << 1;
578
579 writew(len2, baseAddr + loadlen);
580 writew(0, baseAddr + key);
581 for (i = 0; i < 100; i++) {
582 if (readw(baseAddr + key) == keycode)
583 break;
584 msleep(10);
585 }
586 if (readw(baseAddr + key) != keycode)
587 return -EIO;
588 }
589 writew(0, baseAddr + loadlen);
590 writew(usum, baseAddr + checksum);
591 writew(0, baseAddr + key);
592 for (i = 0; i < 100; i++) {
593 if (readw(baseAddr + key) == keycode)
594 break;
595 msleep(10);
596 }
597 retry++;
598 } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
599 if (readb(baseAddr + checksum_ok) != 1)
600 return -EIO;
601
602 writew(0, baseAddr + key);
603 for (i = 0; i < 600; i++) {
604 if (readw(baseAddr + Magic_no) == Magic_code)
605 break;
606 msleep(10);
607 }
608 if (readw(baseAddr + Magic_no) != Magic_code)
609 return -EIO;
610
611 if (MOXA_IS_320(brd)) {
612 if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */
613 writew(0x3800, baseAddr + TMS320_PORT1);
614 writew(0x3900, baseAddr + TMS320_PORT2);
615 writew(28499, baseAddr + TMS320_CLOCK);
616 } else {
617 writew(0x3200, baseAddr + TMS320_PORT1);
618 writew(0x3400, baseAddr + TMS320_PORT2);
619 writew(19999, baseAddr + TMS320_CLOCK);
620 }
621 }
622 writew(1, baseAddr + Disable_IRQ);
623 writew(0, baseAddr + Magic_no);
624 for (i = 0; i < 500; i++) {
625 if (readw(baseAddr + Magic_no) == Magic_code)
626 break;
627 msleep(10);
628 }
629 if (readw(baseAddr + Magic_no) != Magic_code)
630 return -EIO;
631
632 if (MOXA_IS_320(brd)) {
633 j = readw(baseAddr + Module_cnt);
634 if (j <= 0)
635 return -EIO;
636 brd->numPorts = j * 8;
637 writew(j, baseAddr + Module_no);
638 writew(0, baseAddr + Magic_no);
639 for (i = 0; i < 600; i++) {
640 if (readw(baseAddr + Magic_no) == Magic_code)
641 break;
642 msleep(10);
643 }
644 if (readw(baseAddr + Magic_no) != Magic_code)
645 return -EIO;
646 }
647 brd->intNdx = baseAddr + IRQindex;
648 brd->intPend = baseAddr + IRQpending;
649 brd->intTable = baseAddr + IRQtable;
650
651 return 0;
652 }
653
654 static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
655 size_t len)
656 {
657 void __iomem *ofsAddr, *baseAddr = brd->basemem;
658 struct moxa_port *port;
659 int retval, i;
660
661 if (len % 2) {
662 printk(KERN_ERR "MOXA: bios length is not even\n");
663 return -EINVAL;
664 }
665
666 retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
667 if (retval)
668 return retval;
669
670 switch (brd->boardType) {
671 case MOXA_BOARD_C218_ISA:
672 case MOXA_BOARD_C218_PCI:
673 case MOXA_BOARD_CP204J:
674 port = brd->ports;
675 for (i = 0; i < brd->numPorts; i++, port++) {
676 port->board = brd;
677 port->DCDState = 0;
678 port->tableAddr = baseAddr + Extern_table +
679 Extern_size * i;
680 ofsAddr = port->tableAddr;
681 writew(C218rx_mask, ofsAddr + RX_mask);
682 writew(C218tx_mask, ofsAddr + TX_mask);
683 writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
684 writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
685
686 writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
687 writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
688
689 }
690 break;
691 default:
692 port = brd->ports;
693 for (i = 0; i < brd->numPorts; i++, port++) {
694 port->board = brd;
695 port->DCDState = 0;
696 port->tableAddr = baseAddr + Extern_table +
697 Extern_size * i;
698 ofsAddr = port->tableAddr;
699 switch (brd->numPorts) {
700 case 8:
701 writew(C320p8rx_mask, ofsAddr + RX_mask);
702 writew(C320p8tx_mask, ofsAddr + TX_mask);
703 writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
704 writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
705 writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
706 writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
707
708 break;
709 case 16:
710 writew(C320p16rx_mask, ofsAddr + RX_mask);
711 writew(C320p16tx_mask, ofsAddr + TX_mask);
712 writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
713 writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
714 writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
715 writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
716 break;
717
718 case 24:
719 writew(C320p24rx_mask, ofsAddr + RX_mask);
720 writew(C320p24tx_mask, ofsAddr + TX_mask);
721 writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
722 writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
723 writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
724 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
725 break;
726 case 32:
727 writew(C320p32rx_mask, ofsAddr + RX_mask);
728 writew(C320p32tx_mask, ofsAddr + TX_mask);
729 writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
730 writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
731 writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
732 writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
733 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
734 break;
735 }
736 }
737 break;
738 }
739 return 0;
740 }
741
742 static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
743 {
744 const void *ptr = fw->data;
745 char rsn[64];
746 u16 lens[5];
747 size_t len;
748 unsigned int a, lenp, lencnt;
749 int ret = -EINVAL;
750 struct {
751 __le32 magic; /* 0x34303430 */
752 u8 reserved1[2];
753 u8 type; /* UNIX = 3 */
754 u8 model; /* C218T=1, C320T=2, CP204=3 */
755 u8 reserved2[8];
756 __le16 len[5];
757 } const *hdr = ptr;
758
759 BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
760
761 if (fw->size < MOXA_FW_HDRLEN) {
762 strcpy(rsn, "too short (even header won't fit)");
763 goto err;
764 }
765 if (hdr->magic != cpu_to_le32(0x30343034)) {
766 sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
767 goto err;
768 }
769 if (hdr->type != 3) {
770 sprintf(rsn, "not for linux, type is %u", hdr->type);
771 goto err;
772 }
773 if (moxa_check_fw_model(brd, hdr->model)) {
774 sprintf(rsn, "not for this card, model is %u", hdr->model);
775 goto err;
776 }
777
778 len = MOXA_FW_HDRLEN;
779 lencnt = hdr->model == 2 ? 5 : 3;
780 for (a = 0; a < ARRAY_SIZE(lens); a++) {
781 lens[a] = le16_to_cpu(hdr->len[a]);
782 if (lens[a] && len + lens[a] <= fw->size &&
783 moxa_check_fw(&fw->data[len]))
784 printk(KERN_WARNING "MOXA firmware: unexpected input "
785 "at offset %u, but going on\n", (u32)len);
786 if (!lens[a] && a < lencnt) {
787 sprintf(rsn, "too few entries in fw file");
788 goto err;
789 }
790 len += lens[a];
791 }
792
793 if (len != fw->size) {
794 sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
795 (u32)len);
796 goto err;
797 }
798
799 ptr += MOXA_FW_HDRLEN;
800 lenp = 0; /* bios */
801
802 strcpy(rsn, "read above");
803
804 ret = moxa_load_bios(brd, ptr, lens[lenp]);
805 if (ret)
806 goto err;
807
808 /* we skip the tty section (lens[1]), since we don't need it */
809 ptr += lens[lenp] + lens[lenp + 1];
810 lenp += 2; /* comm */
811
812 if (hdr->model == 2) {
813 ret = moxa_load_320b(brd, ptr, lens[lenp]);
814 if (ret)
815 goto err;
816 /* skip another tty */
817 ptr += lens[lenp] + lens[lenp + 1];
818 lenp += 2;
819 }
820
821 ret = moxa_load_code(brd, ptr, lens[lenp]);
822 if (ret)
823 goto err;
824
825 return 0;
826 err:
827 printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
828 return ret;
829 }
830
831 static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
832 {
833 const struct firmware *fw;
834 const char *file;
835 struct moxa_port *p;
836 unsigned int i;
837 int ret;
838
839 brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
840 GFP_KERNEL);
841 if (brd->ports == NULL) {
842 printk(KERN_ERR "cannot allocate memory for ports\n");
843 ret = -ENOMEM;
844 goto err;
845 }
846
847 for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
848 tty_port_init(&p->port);
849 p->port.ops = &moxa_port_ops;
850 p->type = PORT_16550A;
851 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
852 }
853
854 switch (brd->boardType) {
855 case MOXA_BOARD_C218_ISA:
856 case MOXA_BOARD_C218_PCI:
857 file = "c218tunx.cod";
858 break;
859 case MOXA_BOARD_CP204J:
860 file = "cp204unx.cod";
861 break;
862 default:
863 file = "c320tunx.cod";
864 break;
865 }
866
867 ret = request_firmware(&fw, file, dev);
868 if (ret) {
869 printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
870 "you've placed '%s' file into your firmware "
871 "loader directory (e.g. /lib/firmware)\n",
872 file);
873 goto err_free;
874 }
875
876 ret = moxa_load_fw(brd, fw);
877
878 release_firmware(fw);
879
880 if (ret)
881 goto err_free;
882
883 spin_lock_bh(&moxa_lock);
884 brd->ready = 1;
885 if (!timer_pending(&moxaTimer))
886 mod_timer(&moxaTimer, jiffies + HZ / 50);
887 spin_unlock_bh(&moxa_lock);
888
889 return 0;
890 err_free:
891 kfree(brd->ports);
892 err:
893 return ret;
894 }
895
896 static void moxa_board_deinit(struct moxa_board_conf *brd)
897 {
898 unsigned int a, opened;
899
900 mutex_lock(&moxa_openlock);
901 spin_lock_bh(&moxa_lock);
902 brd->ready = 0;
903 spin_unlock_bh(&moxa_lock);
904
905 /* pci hot-un-plug support */
906 for (a = 0; a < brd->numPorts; a++)
907 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
908 struct tty_struct *tty = tty_port_tty_get(
909 &brd->ports[a].port);
910 if (tty) {
911 tty_hangup(tty);
912 tty_kref_put(tty);
913 }
914 }
915 while (1) {
916 opened = 0;
917 for (a = 0; a < brd->numPorts; a++)
918 if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
919 opened++;
920 mutex_unlock(&moxa_openlock);
921 if (!opened)
922 break;
923 msleep(50);
924 mutex_lock(&moxa_openlock);
925 }
926
927 iounmap(brd->basemem);
928 brd->basemem = NULL;
929 kfree(brd->ports);
930 }
931
932 #ifdef CONFIG_PCI
933 static int __devinit moxa_pci_probe(struct pci_dev *pdev,
934 const struct pci_device_id *ent)
935 {
936 struct moxa_board_conf *board;
937 unsigned int i;
938 int board_type = ent->driver_data;
939 int retval;
940
941 retval = pci_enable_device(pdev);
942 if (retval) {
943 dev_err(&pdev->dev, "can't enable pci device\n");
944 goto err;
945 }
946
947 for (i = 0; i < MAX_BOARDS; i++)
948 if (moxa_boards[i].basemem == NULL)
949 break;
950
951 retval = -ENODEV;
952 if (i >= MAX_BOARDS) {
953 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
954 "found. Board is ignored.\n", MAX_BOARDS);
955 goto err;
956 }
957
958 board = &moxa_boards[i];
959
960 retval = pci_request_region(pdev, 2, "moxa-base");
961 if (retval) {
962 dev_err(&pdev->dev, "can't request pci region 2\n");
963 goto err;
964 }
965
966 board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
967 if (board->basemem == NULL) {
968 dev_err(&pdev->dev, "can't remap io space 2\n");
969 goto err_reg;
970 }
971
972 board->boardType = board_type;
973 switch (board_type) {
974 case MOXA_BOARD_C218_ISA:
975 case MOXA_BOARD_C218_PCI:
976 board->numPorts = 8;
977 break;
978
979 case MOXA_BOARD_CP204J:
980 board->numPorts = 4;
981 break;
982 default:
983 board->numPorts = 0;
984 break;
985 }
986 board->busType = MOXA_BUS_TYPE_PCI;
987
988 retval = moxa_init_board(board, &pdev->dev);
989 if (retval)
990 goto err_base;
991
992 pci_set_drvdata(pdev, board);
993
994 dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
995 moxa_brdname[board_type - 1], board->numPorts);
996
997 return 0;
998 err_base:
999 iounmap(board->basemem);
1000 board->basemem = NULL;
1001 err_reg:
1002 pci_release_region(pdev, 2);
1003 err:
1004 return retval;
1005 }
1006
1007 static void __devexit moxa_pci_remove(struct pci_dev *pdev)
1008 {
1009 struct moxa_board_conf *brd = pci_get_drvdata(pdev);
1010
1011 moxa_board_deinit(brd);
1012
1013 pci_release_region(pdev, 2);
1014 }
1015
1016 static struct pci_driver moxa_pci_driver = {
1017 .name = "moxa",
1018 .id_table = moxa_pcibrds,
1019 .probe = moxa_pci_probe,
1020 .remove = __devexit_p(moxa_pci_remove)
1021 };
1022 #endif /* CONFIG_PCI */
1023
1024 static int __init moxa_init(void)
1025 {
1026 unsigned int isabrds = 0;
1027 int retval = 0;
1028 struct moxa_board_conf *brd = moxa_boards;
1029 unsigned int i;
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
1058 for (i = 0; i < MAX_BOARDS; i++) {
1059 if (!baseaddr[i])
1060 break;
1061 if (type[i] == MOXA_BOARD_C218_ISA ||
1062 type[i] == MOXA_BOARD_C320_ISA) {
1063 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1064 isabrds + 1, moxa_brdname[type[i] - 1],
1065 baseaddr[i]);
1066 brd->boardType = type[i];
1067 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1068 numports[i];
1069 brd->busType = MOXA_BUS_TYPE_ISA;
1070 brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1071 if (!brd->basemem) {
1072 printk(KERN_ERR "MOXA: can't remap %lx\n",
1073 baseaddr[i]);
1074 continue;
1075 }
1076 if (moxa_init_board(brd, NULL)) {
1077 iounmap(brd->basemem);
1078 brd->basemem = NULL;
1079 continue;
1080 }
1081
1082 printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1083 "ready (%u ports, firmware loaded)\n",
1084 baseaddr[i], brd->numPorts);
1085
1086 brd++;
1087 isabrds++;
1088 }
1089 }
1090
1091 #ifdef CONFIG_PCI
1092 retval = pci_register_driver(&moxa_pci_driver);
1093 if (retval) {
1094 printk(KERN_ERR "Can't register MOXA pci driver!\n");
1095 if (isabrds)
1096 retval = 0;
1097 }
1098 #endif
1099
1100 return retval;
1101 }
1102
1103 static void __exit moxa_exit(void)
1104 {
1105 unsigned int i;
1106
1107 #ifdef CONFIG_PCI
1108 pci_unregister_driver(&moxa_pci_driver);
1109 #endif
1110
1111 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1112 if (moxa_boards[i].ready)
1113 moxa_board_deinit(&moxa_boards[i]);
1114
1115 del_timer_sync(&moxaTimer);
1116
1117 if (tty_unregister_driver(moxaDriver))
1118 printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1119 "serial driver\n");
1120 put_tty_driver(moxaDriver);
1121 }
1122
1123 module_init(moxa_init);
1124 module_exit(moxa_exit);
1125
1126 static void moxa_shutdown(struct tty_port *port)
1127 {
1128 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1129 MoxaPortDisable(ch);
1130 MoxaPortFlushData(ch, 2);
1131 clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
1132 }
1133
1134 static int moxa_carrier_raised(struct tty_port *port)
1135 {
1136 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1137 int dcd;
1138
1139 spin_lock_irq(&port->lock);
1140 dcd = ch->DCDState;
1141 spin_unlock_irq(&port->lock);
1142 return dcd;
1143 }
1144
1145 static void moxa_dtr_rts(struct tty_port *port, int onoff)
1146 {
1147 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1148 MoxaPortLineCtrl(ch, onoff, onoff);
1149 }
1150
1151
1152 static int moxa_open(struct tty_struct *tty, struct file *filp)
1153 {
1154 struct moxa_board_conf *brd;
1155 struct moxa_port *ch;
1156 int port;
1157 int retval;
1158
1159 port = tty->index;
1160 if (port == MAX_PORTS) {
1161 return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1162 }
1163 if (mutex_lock_interruptible(&moxa_openlock))
1164 return -ERESTARTSYS;
1165 brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1166 if (!brd->ready) {
1167 mutex_unlock(&moxa_openlock);
1168 return -ENODEV;
1169 }
1170
1171 if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1172 mutex_unlock(&moxa_openlock);
1173 return -ENODEV;
1174 }
1175
1176 ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1177 ch->port.count++;
1178 tty->driver_data = ch;
1179 tty_port_tty_set(&ch->port, tty);
1180 mutex_lock(&ch->port.mutex);
1181 if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1182 ch->statusflags = 0;
1183 moxa_set_tty_param(tty, tty->termios);
1184 MoxaPortLineCtrl(ch, 1, 1);
1185 MoxaPortEnable(ch);
1186 MoxaSetFifo(ch, ch->type == PORT_16550A);
1187 ch->port.flags |= ASYNC_INITIALIZED;
1188 }
1189 mutex_unlock(&ch->port.mutex);
1190 mutex_unlock(&moxa_openlock);
1191
1192 retval = tty_port_block_til_ready(&ch->port, tty, filp);
1193 if (retval == 0)
1194 set_bit(ASYNCB_NORMAL_ACTIVE, &ch->port.flags);
1195 return retval;
1196 }
1197
1198 static void moxa_close(struct tty_struct *tty, struct file *filp)
1199 {
1200 struct moxa_port *ch = tty->driver_data;
1201 ch->cflag = tty->termios->c_cflag;
1202 tty_port_close(&ch->port, tty, filp);
1203 }
1204
1205 static int moxa_write(struct tty_struct *tty,
1206 const unsigned char *buf, int count)
1207 {
1208 struct moxa_port *ch = tty->driver_data;
1209 int len;
1210
1211 if (ch == NULL)
1212 return 0;
1213
1214 spin_lock_bh(&moxa_lock);
1215 len = MoxaPortWriteData(tty, buf, count);
1216 spin_unlock_bh(&moxa_lock);
1217
1218 set_bit(LOWWAIT, &ch->statusflags);
1219 return len;
1220 }
1221
1222 static int moxa_write_room(struct tty_struct *tty)
1223 {
1224 struct moxa_port *ch;
1225
1226 if (tty->stopped)
1227 return 0;
1228 ch = tty->driver_data;
1229 if (ch == NULL)
1230 return 0;
1231 return MoxaPortTxFree(ch);
1232 }
1233
1234 static void moxa_flush_buffer(struct tty_struct *tty)
1235 {
1236 struct moxa_port *ch = tty->driver_data;
1237
1238 if (ch == NULL)
1239 return;
1240 MoxaPortFlushData(ch, 1);
1241 tty_wakeup(tty);
1242 }
1243
1244 static int moxa_chars_in_buffer(struct tty_struct *tty)
1245 {
1246 struct moxa_port *ch = tty->driver_data;
1247 int chars;
1248
1249 chars = MoxaPortTxQueue(ch);
1250 if (chars)
1251 /*
1252 * Make it possible to wakeup anything waiting for output
1253 * in tty_ioctl.c, etc.
1254 */
1255 set_bit(EMPTYWAIT, &ch->statusflags);
1256 return chars;
1257 }
1258
1259 static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
1260 {
1261 struct moxa_port *ch = tty->driver_data;
1262 int flag = 0, dtr, rts;
1263
1264 MoxaPortGetLineOut(ch, &dtr, &rts);
1265 if (dtr)
1266 flag |= TIOCM_DTR;
1267 if (rts)
1268 flag |= TIOCM_RTS;
1269 dtr = MoxaPortLineStatus(ch);
1270 if (dtr & 1)
1271 flag |= TIOCM_CTS;
1272 if (dtr & 2)
1273 flag |= TIOCM_DSR;
1274 if (dtr & 4)
1275 flag |= TIOCM_CD;
1276 return flag;
1277 }
1278
1279 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
1280 unsigned int set, unsigned int clear)
1281 {
1282 struct moxa_port *ch;
1283 int port;
1284 int dtr, rts;
1285
1286 port = tty->index;
1287 mutex_lock(&moxa_openlock);
1288 ch = tty->driver_data;
1289 if (!ch) {
1290 mutex_unlock(&moxa_openlock);
1291 return -EINVAL;
1292 }
1293
1294 MoxaPortGetLineOut(ch, &dtr, &rts);
1295 if (set & TIOCM_RTS)
1296 rts = 1;
1297 if (set & TIOCM_DTR)
1298 dtr = 1;
1299 if (clear & TIOCM_RTS)
1300 rts = 0;
1301 if (clear & TIOCM_DTR)
1302 dtr = 0;
1303 MoxaPortLineCtrl(ch, dtr, rts);
1304 mutex_unlock(&moxa_openlock);
1305 return 0;
1306 }
1307
1308 static void moxa_set_termios(struct tty_struct *tty,
1309 struct ktermios *old_termios)
1310 {
1311 struct moxa_port *ch = tty->driver_data;
1312
1313 if (ch == NULL)
1314 return;
1315 moxa_set_tty_param(tty, old_termios);
1316 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1317 wake_up_interruptible(&ch->port.open_wait);
1318 }
1319
1320 static void moxa_stop(struct tty_struct *tty)
1321 {
1322 struct moxa_port *ch = tty->driver_data;
1323
1324 if (ch == NULL)
1325 return;
1326 MoxaPortTxDisable(ch);
1327 set_bit(TXSTOPPED, &ch->statusflags);
1328 }
1329
1330
1331 static void moxa_start(struct tty_struct *tty)
1332 {
1333 struct moxa_port *ch = tty->driver_data;
1334
1335 if (ch == NULL)
1336 return;
1337
1338 if (!(ch->statusflags & TXSTOPPED))
1339 return;
1340
1341 MoxaPortTxEnable(ch);
1342 clear_bit(TXSTOPPED, &ch->statusflags);
1343 }
1344
1345 static void moxa_hangup(struct tty_struct *tty)
1346 {
1347 struct moxa_port *ch = tty->driver_data;
1348 tty_port_hangup(&ch->port);
1349 }
1350
1351 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1352 {
1353 struct tty_struct *tty;
1354 unsigned long flags;
1355 dcd = !!dcd;
1356
1357 spin_lock_irqsave(&p->port.lock, flags);
1358 if (dcd != p->DCDState) {
1359 p->DCDState = dcd;
1360 spin_unlock_irqrestore(&p->port.lock, flags);
1361 tty = tty_port_tty_get(&p->port);
1362 if (tty && C_CLOCAL(tty) && !dcd)
1363 tty_hangup(tty);
1364 tty_kref_put(tty);
1365 }
1366 else
1367 spin_unlock_irqrestore(&p->port.lock, flags);
1368 }
1369
1370 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1371 u16 __iomem *ip)
1372 {
1373 struct tty_struct *tty = tty_port_tty_get(&p->port);
1374 void __iomem *ofsAddr;
1375 unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1376 u16 intr;
1377
1378 if (tty) {
1379 if (test_bit(EMPTYWAIT, &p->statusflags) &&
1380 MoxaPortTxQueue(p) == 0) {
1381 clear_bit(EMPTYWAIT, &p->statusflags);
1382 tty_wakeup(tty);
1383 }
1384 if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
1385 MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1386 clear_bit(LOWWAIT, &p->statusflags);
1387 tty_wakeup(tty);
1388 }
1389
1390 if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
1391 MoxaPortRxQueue(p) > 0) { /* RX */
1392 MoxaPortReadData(p);
1393 tty_schedule_flip(tty);
1394 }
1395 } else {
1396 clear_bit(EMPTYWAIT, &p->statusflags);
1397 MoxaPortFlushData(p, 0); /* flush RX */
1398 }
1399
1400 if (!handle) /* nothing else to do */
1401 goto put;
1402
1403 intr = readw(ip); /* port irq status */
1404 if (intr == 0)
1405 goto put;
1406
1407 writew(0, ip); /* ACK port */
1408 ofsAddr = p->tableAddr;
1409 if (intr & IntrTx) /* disable tx intr */
1410 writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1411 ofsAddr + HostStat);
1412
1413 if (!inited)
1414 goto put;
1415
1416 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1417 tty_insert_flip_char(tty, 0, TTY_BREAK);
1418 tty_schedule_flip(tty);
1419 }
1420
1421 if (intr & IntrLine)
1422 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1423 put:
1424 tty_kref_put(tty);
1425
1426 return 0;
1427 }
1428
1429 static void moxa_poll(unsigned long ignored)
1430 {
1431 struct moxa_board_conf *brd;
1432 u16 __iomem *ip;
1433 unsigned int card, port, served = 0;
1434
1435 spin_lock(&moxa_lock);
1436 for (card = 0; card < MAX_BOARDS; card++) {
1437 brd = &moxa_boards[card];
1438 if (!brd->ready)
1439 continue;
1440
1441 served++;
1442
1443 ip = NULL;
1444 if (readb(brd->intPend) == 0xff)
1445 ip = brd->intTable + readb(brd->intNdx);
1446
1447 for (port = 0; port < brd->numPorts; port++)
1448 moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1449
1450 if (ip)
1451 writeb(0, brd->intPend); /* ACK */
1452
1453 if (moxaLowWaterChk) {
1454 struct moxa_port *p = brd->ports;
1455 for (port = 0; port < brd->numPorts; port++, p++)
1456 if (p->lowChkFlag) {
1457 p->lowChkFlag = 0;
1458 moxa_low_water_check(p->tableAddr);
1459 }
1460 }
1461 }
1462 moxaLowWaterChk = 0;
1463
1464 if (served)
1465 mod_timer(&moxaTimer, jiffies + HZ / 50);
1466 spin_unlock(&moxa_lock);
1467 }
1468
1469 /******************************************************************************/
1470
1471 static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1472 {
1473 register struct ktermios *ts = tty->termios;
1474 struct moxa_port *ch = tty->driver_data;
1475 int rts, cts, txflow, rxflow, xany, baud;
1476
1477 rts = cts = txflow = rxflow = xany = 0;
1478 if (ts->c_cflag & CRTSCTS)
1479 rts = cts = 1;
1480 if (ts->c_iflag & IXON)
1481 txflow = 1;
1482 if (ts->c_iflag & IXOFF)
1483 rxflow = 1;
1484 if (ts->c_iflag & IXANY)
1485 xany = 1;
1486
1487 /* Clear the features we don't support */
1488 ts->c_cflag &= ~CMSPAR;
1489 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1490 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1491 if (baud == -1)
1492 baud = tty_termios_baud_rate(old_termios);
1493 /* Not put the baud rate into the termios data */
1494 tty_encode_baud_rate(tty, baud, baud);
1495 }
1496
1497 /*****************************************************************************
1498 * Driver level functions: *
1499 *****************************************************************************/
1500
1501 static void MoxaPortFlushData(struct moxa_port *port, int mode)
1502 {
1503 void __iomem *ofsAddr;
1504 if (mode < 0 || mode > 2)
1505 return;
1506 ofsAddr = port->tableAddr;
1507 moxafunc(ofsAddr, FC_FlushQueue, mode);
1508 if (mode != 1) {
1509 port->lowChkFlag = 0;
1510 moxa_low_water_check(ofsAddr);
1511 }
1512 }
1513
1514 /*
1515 * Moxa Port Number Description:
1516 *
1517 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1518 * the port number using in MOXA driver functions will be 0 to 31 for
1519 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1520 * to 127 for fourth. For example, if you setup three MOXA boards,
1521 * first board is C218, second board is C320-16 and third board is
1522 * C320-32. The port number of first board (C218 - 8 ports) is from
1523 * 0 to 7. The port number of second board (C320 - 16 ports) is form
1524 * 32 to 47. The port number of third board (C320 - 32 ports) is from
1525 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1526 * 127 will be invalid.
1527 *
1528 *
1529 * Moxa Functions Description:
1530 *
1531 * Function 1: Driver initialization routine, this routine must be
1532 * called when initialized driver.
1533 * Syntax:
1534 * void MoxaDriverInit();
1535 *
1536 *
1537 * Function 2: Moxa driver private IOCTL command processing.
1538 * Syntax:
1539 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1540 *
1541 * unsigned int cmd : IOCTL command
1542 * unsigned long arg : IOCTL argument
1543 * int port : port number (0 - 127)
1544 *
1545 * return: 0 (OK)
1546 * -EINVAL
1547 * -ENOIOCTLCMD
1548 *
1549 *
1550 * Function 6: Enable this port to start Tx/Rx data.
1551 * Syntax:
1552 * void MoxaPortEnable(int port);
1553 * int port : port number (0 - 127)
1554 *
1555 *
1556 * Function 7: Disable this port
1557 * Syntax:
1558 * void MoxaPortDisable(int port);
1559 * int port : port number (0 - 127)
1560 *
1561 *
1562 * Function 10: Setting baud rate of this port.
1563 * Syntax:
1564 * speed_t MoxaPortSetBaud(int port, speed_t baud);
1565 * int port : port number (0 - 127)
1566 * long baud : baud rate (50 - 115200)
1567 *
1568 * return: 0 : this port is invalid or baud < 50
1569 * 50 - 115200 : the real baud rate set to the port, if
1570 * the argument baud is large than maximun
1571 * available baud rate, the real setting
1572 * baud rate will be the maximun baud rate.
1573 *
1574 *
1575 * Function 12: Configure the port.
1576 * Syntax:
1577 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1578 * int port : port number (0 - 127)
1579 * struct ktermios * termio : termio structure pointer
1580 * speed_t baud : baud rate
1581 *
1582 * return: -1 : this port is invalid or termio == NULL
1583 * 0 : setting O.K.
1584 *
1585 *
1586 * Function 13: Get the DTR/RTS state of this port.
1587 * Syntax:
1588 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1589 * int port : port number (0 - 127)
1590 * int * dtrState : pointer to INT to receive the current DTR
1591 * state. (if NULL, this function will not
1592 * write to this address)
1593 * int * rtsState : pointer to INT to receive the current RTS
1594 * state. (if NULL, this function will not
1595 * write to this address)
1596 *
1597 * return: -1 : this port is invalid
1598 * 0 : O.K.
1599 *
1600 *
1601 * Function 14: Setting the DTR/RTS output state of this port.
1602 * Syntax:
1603 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1604 * int port : port number (0 - 127)
1605 * int dtrState : DTR output state (0: off, 1: on)
1606 * int rtsState : RTS output state (0: off, 1: on)
1607 *
1608 *
1609 * Function 15: Setting the flow control of this port.
1610 * Syntax:
1611 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1612 * int txFlow,int xany);
1613 * int port : port number (0 - 127)
1614 * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1615 * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1616 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1617 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1618 * int xany : S/W XANY flow control (0: no, 1: yes)
1619 *
1620 *
1621 * Function 16: Get ths line status of this port
1622 * Syntax:
1623 * int MoxaPortLineStatus(int port);
1624 * int port : port number (0 - 127)
1625 *
1626 * return: Bit 0 - CTS state (0: off, 1: on)
1627 * Bit 1 - DSR state (0: off, 1: on)
1628 * Bit 2 - DCD state (0: off, 1: on)
1629 *
1630 *
1631 * Function 19: Flush the Rx/Tx buffer data of this port.
1632 * Syntax:
1633 * void MoxaPortFlushData(int port, int mode);
1634 * int port : port number (0 - 127)
1635 * int mode
1636 * 0 : flush the Rx buffer
1637 * 1 : flush the Tx buffer
1638 * 2 : flush the Rx and Tx buffer
1639 *
1640 *
1641 * Function 20: Write data.
1642 * Syntax:
1643 * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1644 * int port : port number (0 - 127)
1645 * unsigned char * buffer : pointer to write data buffer.
1646 * int length : write data length
1647 *
1648 * return: 0 - length : real write data length
1649 *
1650 *
1651 * Function 21: Read data.
1652 * Syntax:
1653 * int MoxaPortReadData(int port, struct tty_struct *tty);
1654 * int port : port number (0 - 127)
1655 * struct tty_struct *tty : tty for data
1656 *
1657 * return: 0 - length : real read data length
1658 *
1659 *
1660 * Function 24: Get the Tx buffer current queued data bytes
1661 * Syntax:
1662 * int MoxaPortTxQueue(int port);
1663 * int port : port number (0 - 127)
1664 *
1665 * return: .. : Tx buffer current queued data bytes
1666 *
1667 *
1668 * Function 25: Get the Tx buffer current free space
1669 * Syntax:
1670 * int MoxaPortTxFree(int port);
1671 * int port : port number (0 - 127)
1672 *
1673 * return: .. : Tx buffer current free space
1674 *
1675 *
1676 * Function 26: Get the Rx buffer current queued data bytes
1677 * Syntax:
1678 * int MoxaPortRxQueue(int port);
1679 * int port : port number (0 - 127)
1680 *
1681 * return: .. : Rx buffer current queued data bytes
1682 *
1683 *
1684 * Function 28: Disable port data transmission.
1685 * Syntax:
1686 * void MoxaPortTxDisable(int port);
1687 * int port : port number (0 - 127)
1688 *
1689 *
1690 * Function 29: Enable port data transmission.
1691 * Syntax:
1692 * void MoxaPortTxEnable(int port);
1693 * int port : port number (0 - 127)
1694 *
1695 *
1696 * Function 31: Get the received BREAK signal count and reset it.
1697 * Syntax:
1698 * int MoxaPortResetBrkCnt(int port);
1699 * int port : port number (0 - 127)
1700 *
1701 * return: 0 - .. : BREAK signal count
1702 *
1703 *
1704 */
1705
1706 static void MoxaPortEnable(struct moxa_port *port)
1707 {
1708 void __iomem *ofsAddr;
1709 u16 lowwater = 512;
1710
1711 ofsAddr = port->tableAddr;
1712 writew(lowwater, ofsAddr + Low_water);
1713 if (MOXA_IS_320(port->board))
1714 moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1715 else
1716 writew(readw(ofsAddr + HostStat) | WakeupBreak,
1717 ofsAddr + HostStat);
1718
1719 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1720 moxafunc(ofsAddr, FC_FlushQueue, 2);
1721
1722 moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1723 MoxaPortLineStatus(port);
1724 }
1725
1726 static void MoxaPortDisable(struct moxa_port *port)
1727 {
1728 void __iomem *ofsAddr = port->tableAddr;
1729
1730 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1731 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1732 writew(0, ofsAddr + HostStat);
1733 moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1734 }
1735
1736 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1737 {
1738 void __iomem *ofsAddr = port->tableAddr;
1739 unsigned int clock, val;
1740 speed_t max;
1741
1742 max = MOXA_IS_320(port->board) ? 460800 : 921600;
1743 if (baud < 50)
1744 return 0;
1745 if (baud > max)
1746 baud = max;
1747 clock = 921600;
1748 val = clock / baud;
1749 moxafunc(ofsAddr, FC_SetBaud, val);
1750 baud = clock / val;
1751 return baud;
1752 }
1753
1754 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1755 speed_t baud)
1756 {
1757 void __iomem *ofsAddr;
1758 tcflag_t cflag;
1759 tcflag_t mode = 0;
1760
1761 ofsAddr = port->tableAddr;
1762 cflag = termio->c_cflag; /* termio->c_cflag */
1763
1764 mode = termio->c_cflag & CSIZE;
1765 if (mode == CS5)
1766 mode = MX_CS5;
1767 else if (mode == CS6)
1768 mode = MX_CS6;
1769 else if (mode == CS7)
1770 mode = MX_CS7;
1771 else if (mode == CS8)
1772 mode = MX_CS8;
1773
1774 if (termio->c_cflag & CSTOPB) {
1775 if (mode == MX_CS5)
1776 mode |= MX_STOP15;
1777 else
1778 mode |= MX_STOP2;
1779 } else
1780 mode |= MX_STOP1;
1781
1782 if (termio->c_cflag & PARENB) {
1783 if (termio->c_cflag & PARODD)
1784 mode |= MX_PARODD;
1785 else
1786 mode |= MX_PAREVEN;
1787 } else
1788 mode |= MX_PARNONE;
1789
1790 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1791
1792 if (MOXA_IS_320(port->board) && baud >= 921600)
1793 return -1;
1794
1795 baud = MoxaPortSetBaud(port, baud);
1796
1797 if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1798 spin_lock_irq(&moxafunc_lock);
1799 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1800 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1801 writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1802 moxa_wait_finish(ofsAddr);
1803 spin_unlock_irq(&moxafunc_lock);
1804
1805 }
1806 return baud;
1807 }
1808
1809 static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1810 int *rtsState)
1811 {
1812 if (dtrState)
1813 *dtrState = !!(port->lineCtrl & DTR_ON);
1814 if (rtsState)
1815 *rtsState = !!(port->lineCtrl & RTS_ON);
1816
1817 return 0;
1818 }
1819
1820 static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1821 {
1822 u8 mode = 0;
1823
1824 if (dtr)
1825 mode |= DTR_ON;
1826 if (rts)
1827 mode |= RTS_ON;
1828 port->lineCtrl = mode;
1829 moxafunc(port->tableAddr, FC_LineControl, mode);
1830 }
1831
1832 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1833 int txflow, int rxflow, int txany)
1834 {
1835 int mode = 0;
1836
1837 if (rts)
1838 mode |= RTS_FlowCtl;
1839 if (cts)
1840 mode |= CTS_FlowCtl;
1841 if (txflow)
1842 mode |= Tx_FlowCtl;
1843 if (rxflow)
1844 mode |= Rx_FlowCtl;
1845 if (txany)
1846 mode |= IXM_IXANY;
1847 moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1848 }
1849
1850 static int MoxaPortLineStatus(struct moxa_port *port)
1851 {
1852 void __iomem *ofsAddr;
1853 int val;
1854
1855 ofsAddr = port->tableAddr;
1856 if (MOXA_IS_320(port->board))
1857 val = moxafuncret(ofsAddr, FC_LineStatus, 0);
1858 else
1859 val = readw(ofsAddr + FlagStat) >> 4;
1860 val &= 0x0B;
1861 if (val & 8)
1862 val |= 4;
1863 moxa_new_dcdstate(port, val & 8);
1864 val &= 7;
1865 return val;
1866 }
1867
1868 static int MoxaPortWriteData(struct tty_struct *tty,
1869 const unsigned char *buffer, int len)
1870 {
1871 struct moxa_port *port = tty->driver_data;
1872 void __iomem *baseAddr, *ofsAddr, *ofs;
1873 unsigned int c, total;
1874 u16 head, tail, tx_mask, spage, epage;
1875 u16 pageno, pageofs, bufhead;
1876
1877 ofsAddr = port->tableAddr;
1878 baseAddr = port->board->basemem;
1879 tx_mask = readw(ofsAddr + TX_mask);
1880 spage = readw(ofsAddr + Page_txb);
1881 epage = readw(ofsAddr + EndPage_txb);
1882 tail = readw(ofsAddr + TXwptr);
1883 head = readw(ofsAddr + TXrptr);
1884 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1885 if (c > len)
1886 c = len;
1887 moxaLog.txcnt[port->port.tty->index] += c;
1888 total = c;
1889 if (spage == epage) {
1890 bufhead = readw(ofsAddr + Ofs_txb);
1891 writew(spage, baseAddr + Control_reg);
1892 while (c > 0) {
1893 if (head > tail)
1894 len = head - tail - 1;
1895 else
1896 len = tx_mask + 1 - tail;
1897 len = (c > len) ? len : c;
1898 ofs = baseAddr + DynPage_addr + bufhead + tail;
1899 memcpy_toio(ofs, buffer, len);
1900 buffer += len;
1901 tail = (tail + len) & tx_mask;
1902 c -= len;
1903 }
1904 } else {
1905 pageno = spage + (tail >> 13);
1906 pageofs = tail & Page_mask;
1907 while (c > 0) {
1908 len = Page_size - pageofs;
1909 if (len > c)
1910 len = c;
1911 writeb(pageno, baseAddr + Control_reg);
1912 ofs = baseAddr + DynPage_addr + pageofs;
1913 memcpy_toio(ofs, buffer, len);
1914 buffer += len;
1915 if (++pageno == epage)
1916 pageno = spage;
1917 pageofs = 0;
1918 c -= len;
1919 }
1920 tail = (tail + total) & tx_mask;
1921 }
1922 writew(tail, ofsAddr + TXwptr);
1923 writeb(1, ofsAddr + CD180TXirq); /* start to send */
1924 return total;
1925 }
1926
1927 static int MoxaPortReadData(struct moxa_port *port)
1928 {
1929 struct tty_struct *tty = port->port.tty;
1930 unsigned char *dst;
1931 void __iomem *baseAddr, *ofsAddr, *ofs;
1932 unsigned int count, len, total;
1933 u16 tail, rx_mask, spage, epage;
1934 u16 pageno, pageofs, bufhead, head;
1935
1936 ofsAddr = port->tableAddr;
1937 baseAddr = port->board->basemem;
1938 head = readw(ofsAddr + RXrptr);
1939 tail = readw(ofsAddr + RXwptr);
1940 rx_mask = readw(ofsAddr + RX_mask);
1941 spage = readw(ofsAddr + Page_rxb);
1942 epage = readw(ofsAddr + EndPage_rxb);
1943 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
1944 if (count == 0)
1945 return 0;
1946
1947 total = count;
1948 moxaLog.rxcnt[tty->index] += total;
1949 if (spage == epage) {
1950 bufhead = readw(ofsAddr + Ofs_rxb);
1951 writew(spage, baseAddr + Control_reg);
1952 while (count > 0) {
1953 ofs = baseAddr + DynPage_addr + bufhead + head;
1954 len = (tail >= head) ? (tail - head) :
1955 (rx_mask + 1 - head);
1956 len = tty_prepare_flip_string(tty, &dst,
1957 min(len, count));
1958 memcpy_fromio(dst, ofs, len);
1959 head = (head + len) & rx_mask;
1960 count -= len;
1961 }
1962 } else {
1963 pageno = spage + (head >> 13);
1964 pageofs = head & Page_mask;
1965 while (count > 0) {
1966 writew(pageno, baseAddr + Control_reg);
1967 ofs = baseAddr + DynPage_addr + pageofs;
1968 len = tty_prepare_flip_string(tty, &dst,
1969 min(Page_size - pageofs, count));
1970 memcpy_fromio(dst, ofs, len);
1971
1972 count -= len;
1973 pageofs = (pageofs + len) & Page_mask;
1974 if (pageofs == 0 && ++pageno == epage)
1975 pageno = spage;
1976 }
1977 head = (head + total) & rx_mask;
1978 }
1979 writew(head, ofsAddr + RXrptr);
1980 if (readb(ofsAddr + FlagStat) & Xoff_state) {
1981 moxaLowWaterChk = 1;
1982 port->lowChkFlag = 1;
1983 }
1984 return total;
1985 }
1986
1987
1988 static int MoxaPortTxQueue(struct moxa_port *port)
1989 {
1990 void __iomem *ofsAddr = port->tableAddr;
1991 u16 rptr, wptr, mask;
1992
1993 rptr = readw(ofsAddr + TXrptr);
1994 wptr = readw(ofsAddr + TXwptr);
1995 mask = readw(ofsAddr + TX_mask);
1996 return (wptr - rptr) & mask;
1997 }
1998
1999 static int MoxaPortTxFree(struct moxa_port *port)
2000 {
2001 void __iomem *ofsAddr = port->tableAddr;
2002 u16 rptr, wptr, mask;
2003
2004 rptr = readw(ofsAddr + TXrptr);
2005 wptr = readw(ofsAddr + TXwptr);
2006 mask = readw(ofsAddr + TX_mask);
2007 return mask - ((wptr - rptr) & mask);
2008 }
2009
2010 static int MoxaPortRxQueue(struct moxa_port *port)
2011 {
2012 void __iomem *ofsAddr = port->tableAddr;
2013 u16 rptr, wptr, mask;
2014
2015 rptr = readw(ofsAddr + RXrptr);
2016 wptr = readw(ofsAddr + RXwptr);
2017 mask = readw(ofsAddr + RX_mask);
2018 return (wptr - rptr) & mask;
2019 }
2020
2021 static void MoxaPortTxDisable(struct moxa_port *port)
2022 {
2023 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2024 }
2025
2026 static void MoxaPortTxEnable(struct moxa_port *port)
2027 {
2028 moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2029 }
2030
2031 static int moxa_get_serial_info(struct moxa_port *info,
2032 struct serial_struct __user *retinfo)
2033 {
2034 struct serial_struct tmp = {
2035 .type = info->type,
2036 .line = info->port.tty->index,
2037 .flags = info->port.flags,
2038 .baud_base = 921600,
2039 .close_delay = info->port.close_delay
2040 };
2041 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2042 }
2043
2044
2045 static int moxa_set_serial_info(struct moxa_port *info,
2046 struct serial_struct __user *new_info)
2047 {
2048 struct serial_struct new_serial;
2049
2050 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2051 return -EFAULT;
2052
2053 if (new_serial.irq != 0 || new_serial.port != 0 ||
2054 new_serial.custom_divisor != 0 ||
2055 new_serial.baud_base != 921600)
2056 return -EPERM;
2057
2058 if (!capable(CAP_SYS_ADMIN)) {
2059 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2060 (info->port.flags & ~ASYNC_USR_MASK)))
2061 return -EPERM;
2062 } else
2063 info->port.close_delay = new_serial.close_delay * HZ / 100;
2064
2065 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2066 new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2067
2068 MoxaSetFifo(info, new_serial.type == PORT_16550A);
2069
2070 info->type = new_serial.type;
2071 return 0;
2072 }
2073
2074
2075
2076 /*****************************************************************************
2077 * Static local functions: *
2078 *****************************************************************************/
2079
2080 static void MoxaSetFifo(struct moxa_port *port, int enable)
2081 {
2082 void __iomem *ofsAddr = port->tableAddr;
2083
2084 if (!enable) {
2085 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2086 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2087 } else {
2088 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2089 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2090 }
2091 }