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net/mlx5e: Fix wrong indications in DIM due to counter wraparound
[linux/fpc-iii.git] / drivers / tty / moxa.c
blob60d37b225589c25a509591f3076af353a19c752f
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
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 static struct tty_port moxa_service_port;
172
173 MODULE_AUTHOR("William Chen");
174 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
175 MODULE_LICENSE("GPL");
176 MODULE_FIRMWARE("c218tunx.cod");
177 MODULE_FIRMWARE("cp204unx.cod");
178 MODULE_FIRMWARE("c320tunx.cod");
179
180 module_param_array(type, uint, NULL, 0);
181 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
182 module_param_array(baseaddr, ulong, NULL, 0);
183 MODULE_PARM_DESC(baseaddr, "base address");
184 module_param_array(numports, uint, NULL, 0);
185 MODULE_PARM_DESC(numports, "numports (ignored for C218)");
186
187 module_param(ttymajor, int, 0);
188
189 /*
190 * static functions:
191 */
192 static int moxa_open(struct tty_struct *, struct file *);
193 static void moxa_close(struct tty_struct *, struct file *);
194 static int moxa_write(struct tty_struct *, const unsigned char *, int);
195 static int moxa_write_room(struct tty_struct *);
196 static void moxa_flush_buffer(struct tty_struct *);
197 static int moxa_chars_in_buffer(struct tty_struct *);
198 static void moxa_set_termios(struct tty_struct *, struct ktermios *);
199 static void moxa_stop(struct tty_struct *);
200 static void moxa_start(struct tty_struct *);
201 static void moxa_hangup(struct tty_struct *);
202 static int moxa_tiocmget(struct tty_struct *tty);
203 static int moxa_tiocmset(struct tty_struct *tty,
204 unsigned int set, unsigned int clear);
205 static void moxa_poll(unsigned long);
206 static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
207 static void moxa_shutdown(struct tty_port *);
208 static int moxa_carrier_raised(struct tty_port *);
209 static void moxa_dtr_rts(struct tty_port *, int);
210 /*
211 * moxa board interface functions:
212 */
213 static void MoxaPortEnable(struct moxa_port *);
214 static void MoxaPortDisable(struct moxa_port *);
215 static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
216 static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
217 static void MoxaPortLineCtrl(struct moxa_port *, int, int);
218 static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
219 static int MoxaPortLineStatus(struct moxa_port *);
220 static void MoxaPortFlushData(struct moxa_port *, int);
221 static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
222 static int MoxaPortReadData(struct moxa_port *);
223 static int MoxaPortTxQueue(struct moxa_port *);
224 static int MoxaPortRxQueue(struct moxa_port *);
225 static int MoxaPortTxFree(struct moxa_port *);
226 static void MoxaPortTxDisable(struct moxa_port *);
227 static void MoxaPortTxEnable(struct moxa_port *);
228 static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
229 static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
230 static void MoxaSetFifo(struct moxa_port *port, int enable);
231
232 /*
233 * I/O functions
234 */
235
236 static DEFINE_SPINLOCK(moxafunc_lock);
237
238 static void moxa_wait_finish(void __iomem *ofsAddr)
239 {
240 unsigned long end = jiffies + moxaFuncTout;
241
242 while (readw(ofsAddr + FuncCode) != 0)
243 if (time_after(jiffies, end))
244 return;
245 if (readw(ofsAddr + FuncCode) != 0)
246 printk_ratelimited(KERN_WARNING "moxa function expired\n");
247 }
248
249 static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
250 {
251 unsigned long flags;
252 spin_lock_irqsave(&moxafunc_lock, flags);
253 writew(arg, ofsAddr + FuncArg);
254 writew(cmd, ofsAddr + FuncCode);
255 moxa_wait_finish(ofsAddr);
256 spin_unlock_irqrestore(&moxafunc_lock, flags);
257 }
258
259 static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
260 {
261 unsigned long flags;
262 u16 ret;
263 spin_lock_irqsave(&moxafunc_lock, flags);
264 writew(arg, ofsAddr + FuncArg);
265 writew(cmd, ofsAddr + FuncCode);
266 moxa_wait_finish(ofsAddr);
267 ret = readw(ofsAddr + FuncArg);
268 spin_unlock_irqrestore(&moxafunc_lock, flags);
269 return ret;
270 }
271
272 static void moxa_low_water_check(void __iomem *ofsAddr)
273 {
274 u16 rptr, wptr, mask, len;
275
276 if (readb(ofsAddr + FlagStat) & Xoff_state) {
277 rptr = readw(ofsAddr + RXrptr);
278 wptr = readw(ofsAddr + RXwptr);
279 mask = readw(ofsAddr + RX_mask);
280 len = (wptr - rptr) & mask;
281 if (len <= Low_water)
282 moxafunc(ofsAddr, FC_SendXon, 0);
283 }
284 }
285
286 /*
287 * TTY operations
288 */
289
290 static int moxa_ioctl(struct tty_struct *tty,
291 unsigned int cmd, unsigned long arg)
292 {
293 struct moxa_port *ch = tty->driver_data;
294 void __user *argp = (void __user *)arg;
295 int status, ret = 0;
296
297 if (tty->index == MAX_PORTS) {
298 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
299 cmd != MOXA_GETMSTATUS)
300 return -EINVAL;
301 } else if (!ch)
302 return -ENODEV;
303
304 switch (cmd) {
305 case MOXA_GETDATACOUNT:
306 moxaLog.tick = jiffies;
307 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
308 ret = -EFAULT;
309 break;
310 case MOXA_FLUSH_QUEUE:
311 MoxaPortFlushData(ch, arg);
312 break;
313 case MOXA_GET_IOQUEUE: {
314 struct moxaq_str __user *argm = argp;
315 struct moxaq_str tmp;
316 struct moxa_port *p;
317 unsigned int i, j;
318
319 for (i = 0; i < MAX_BOARDS; i++) {
320 p = moxa_boards[i].ports;
321 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
322 memset(&tmp, 0, sizeof(tmp));
323 spin_lock_bh(&moxa_lock);
324 if (moxa_boards[i].ready) {
325 tmp.inq = MoxaPortRxQueue(p);
326 tmp.outq = MoxaPortTxQueue(p);
327 }
328 spin_unlock_bh(&moxa_lock);
329 if (copy_to_user(argm, &tmp, sizeof(tmp)))
330 return -EFAULT;
331 }
332 }
333 break;
334 } case MOXA_GET_OQUEUE:
335 status = MoxaPortTxQueue(ch);
336 ret = put_user(status, (unsigned long __user *)argp);
337 break;
338 case MOXA_GET_IQUEUE:
339 status = MoxaPortRxQueue(ch);
340 ret = put_user(status, (unsigned long __user *)argp);
341 break;
342 case MOXA_GETMSTATUS: {
343 struct mxser_mstatus __user *argm = argp;
344 struct mxser_mstatus tmp;
345 struct moxa_port *p;
346 unsigned int i, j;
347
348 for (i = 0; i < MAX_BOARDS; i++) {
349 p = moxa_boards[i].ports;
350 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
351 struct tty_struct *ttyp;
352 memset(&tmp, 0, sizeof(tmp));
353 spin_lock_bh(&moxa_lock);
354 if (!moxa_boards[i].ready) {
355 spin_unlock_bh(&moxa_lock);
356 goto copy;
357 }
358
359 status = MoxaPortLineStatus(p);
360 spin_unlock_bh(&moxa_lock);
361
362 if (status & 1)
363 tmp.cts = 1;
364 if (status & 2)
365 tmp.dsr = 1;
366 if (status & 4)
367 tmp.dcd = 1;
368
369 ttyp = tty_port_tty_get(&p->port);
370 if (!ttyp)
371 tmp.cflag = p->cflag;
372 else
373 tmp.cflag = ttyp->termios.c_cflag;
374 tty_kref_put(ttyp);
375 copy:
376 if (copy_to_user(argm, &tmp, sizeof(tmp)))
377 return -EFAULT;
378 }
379 }
380 break;
381 }
382 case TIOCGSERIAL:
383 mutex_lock(&ch->port.mutex);
384 ret = moxa_get_serial_info(ch, argp);
385 mutex_unlock(&ch->port.mutex);
386 break;
387 case TIOCSSERIAL:
388 mutex_lock(&ch->port.mutex);
389 ret = moxa_set_serial_info(ch, argp);
390 mutex_unlock(&ch->port.mutex);
391 break;
392 default:
393 ret = -ENOIOCTLCMD;
394 }
395 return ret;
396 }
397
398 static int moxa_break_ctl(struct tty_struct *tty, int state)
399 {
400 struct moxa_port *port = tty->driver_data;
401
402 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
403 Magic_code);
404 return 0;
405 }
406
407 static const struct tty_operations moxa_ops = {
408 .open = moxa_open,
409 .close = moxa_close,
410 .write = moxa_write,
411 .write_room = moxa_write_room,
412 .flush_buffer = moxa_flush_buffer,
413 .chars_in_buffer = moxa_chars_in_buffer,
414 .ioctl = moxa_ioctl,
415 .set_termios = moxa_set_termios,
416 .stop = moxa_stop,
417 .start = moxa_start,
418 .hangup = moxa_hangup,
419 .break_ctl = moxa_break_ctl,
420 .tiocmget = moxa_tiocmget,
421 .tiocmset = moxa_tiocmset,
422 };
423
424 static const struct tty_port_operations moxa_port_ops = {
425 .carrier_raised = moxa_carrier_raised,
426 .dtr_rts = moxa_dtr_rts,
427 .shutdown = moxa_shutdown,
428 };
429
430 static struct tty_driver *moxaDriver;
431 static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
432
433 /*
434 * HW init
435 */
436
437 static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
438 {
439 switch (brd->boardType) {
440 case MOXA_BOARD_C218_ISA:
441 case MOXA_BOARD_C218_PCI:
442 if (model != 1)
443 goto err;
444 break;
445 case MOXA_BOARD_CP204J:
446 if (model != 3)
447 goto err;
448 break;
449 default:
450 if (model != 2)
451 goto err;
452 break;
453 }
454 return 0;
455 err:
456 return -EINVAL;
457 }
458
459 static int moxa_check_fw(const void *ptr)
460 {
461 const __le16 *lptr = ptr;
462
463 if (*lptr != cpu_to_le16(0x7980))
464 return -EINVAL;
465
466 return 0;
467 }
468
469 static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
470 size_t len)
471 {
472 void __iomem *baseAddr = brd->basemem;
473 u16 tmp;
474
475 writeb(HW_reset, baseAddr + Control_reg); /* reset */
476 msleep(10);
477 memset_io(baseAddr, 0, 4096);
478 memcpy_toio(baseAddr, buf, len); /* download BIOS */
479 writeb(0, baseAddr + Control_reg); /* restart */
480
481 msleep(2000);
482
483 switch (brd->boardType) {
484 case MOXA_BOARD_C218_ISA:
485 case MOXA_BOARD_C218_PCI:
486 tmp = readw(baseAddr + C218_key);
487 if (tmp != C218_KeyCode)
488 goto err;
489 break;
490 case MOXA_BOARD_CP204J:
491 tmp = readw(baseAddr + C218_key);
492 if (tmp != CP204J_KeyCode)
493 goto err;
494 break;
495 default:
496 tmp = readw(baseAddr + C320_key);
497 if (tmp != C320_KeyCode)
498 goto err;
499 tmp = readw(baseAddr + C320_status);
500 if (tmp != STS_init) {
501 printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
502 "module not found\n");
503 return -EIO;
504 }
505 break;
506 }
507
508 return 0;
509 err:
510 printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
511 return -EIO;
512 }
513
514 static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
515 size_t len)
516 {
517 void __iomem *baseAddr = brd->basemem;
518
519 if (len < 7168) {
520 printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
521 return -EINVAL;
522 }
523
524 writew(len - 7168 - 2, baseAddr + C320bapi_len);
525 writeb(1, baseAddr + Control_reg); /* Select Page 1 */
526 memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
527 writeb(2, baseAddr + Control_reg); /* Select Page 2 */
528 memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
529
530 return 0;
531 }
532
533 static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
534 size_t len)
535 {
536 void __iomem *baseAddr = brd->basemem;
537 const __le16 *uptr = ptr;
538 size_t wlen, len2, j;
539 unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
540 unsigned int i, retry;
541 u16 usum, keycode;
542
543 keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
544 C218_KeyCode;
545
546 switch (brd->boardType) {
547 case MOXA_BOARD_CP204J:
548 case MOXA_BOARD_C218_ISA:
549 case MOXA_BOARD_C218_PCI:
550 key = C218_key;
551 loadbuf = C218_LoadBuf;
552 loadlen = C218DLoad_len;
553 checksum = C218check_sum;
554 checksum_ok = C218chksum_ok;
555 break;
556 default:
557 key = C320_key;
558 keycode = C320_KeyCode;
559 loadbuf = C320_LoadBuf;
560 loadlen = C320DLoad_len;
561 checksum = C320check_sum;
562 checksum_ok = C320chksum_ok;
563 break;
564 }
565
566 usum = 0;
567 wlen = len >> 1;
568 for (i = 0; i < wlen; i++)
569 usum += le16_to_cpu(uptr[i]);
570 retry = 0;
571 do {
572 wlen = len >> 1;
573 j = 0;
574 while (wlen) {
575 len2 = (wlen > 2048) ? 2048 : wlen;
576 wlen -= len2;
577 memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
578 j += len2 << 1;
579
580 writew(len2, baseAddr + loadlen);
581 writew(0, baseAddr + key);
582 for (i = 0; i < 100; i++) {
583 if (readw(baseAddr + key) == keycode)
584 break;
585 msleep(10);
586 }
587 if (readw(baseAddr + key) != keycode)
588 return -EIO;
589 }
590 writew(0, baseAddr + loadlen);
591 writew(usum, baseAddr + checksum);
592 writew(0, baseAddr + key);
593 for (i = 0; i < 100; i++) {
594 if (readw(baseAddr + key) == keycode)
595 break;
596 msleep(10);
597 }
598 retry++;
599 } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
600 if (readb(baseAddr + checksum_ok) != 1)
601 return -EIO;
602
603 writew(0, baseAddr + key);
604 for (i = 0; i < 600; i++) {
605 if (readw(baseAddr + Magic_no) == Magic_code)
606 break;
607 msleep(10);
608 }
609 if (readw(baseAddr + Magic_no) != Magic_code)
610 return -EIO;
611
612 if (MOXA_IS_320(brd)) {
613 if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */
614 writew(0x3800, baseAddr + TMS320_PORT1);
615 writew(0x3900, baseAddr + TMS320_PORT2);
616 writew(28499, baseAddr + TMS320_CLOCK);
617 } else {
618 writew(0x3200, baseAddr + TMS320_PORT1);
619 writew(0x3400, baseAddr + TMS320_PORT2);
620 writew(19999, baseAddr + TMS320_CLOCK);
621 }
622 }
623 writew(1, baseAddr + Disable_IRQ);
624 writew(0, baseAddr + Magic_no);
625 for (i = 0; i < 500; i++) {
626 if (readw(baseAddr + Magic_no) == Magic_code)
627 break;
628 msleep(10);
629 }
630 if (readw(baseAddr + Magic_no) != Magic_code)
631 return -EIO;
632
633 if (MOXA_IS_320(brd)) {
634 j = readw(baseAddr + Module_cnt);
635 if (j <= 0)
636 return -EIO;
637 brd->numPorts = j * 8;
638 writew(j, baseAddr + Module_no);
639 writew(0, baseAddr + Magic_no);
640 for (i = 0; i < 600; i++) {
641 if (readw(baseAddr + Magic_no) == Magic_code)
642 break;
643 msleep(10);
644 }
645 if (readw(baseAddr + Magic_no) != Magic_code)
646 return -EIO;
647 }
648 brd->intNdx = baseAddr + IRQindex;
649 brd->intPend = baseAddr + IRQpending;
650 brd->intTable = baseAddr + IRQtable;
651
652 return 0;
653 }
654
655 static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
656 size_t len)
657 {
658 void __iomem *ofsAddr, *baseAddr = brd->basemem;
659 struct moxa_port *port;
660 int retval, i;
661
662 if (len % 2) {
663 printk(KERN_ERR "MOXA: bios length is not even\n");
664 return -EINVAL;
665 }
666
667 retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
668 if (retval)
669 return retval;
670
671 switch (brd->boardType) {
672 case MOXA_BOARD_C218_ISA:
673 case MOXA_BOARD_C218_PCI:
674 case MOXA_BOARD_CP204J:
675 port = brd->ports;
676 for (i = 0; i < brd->numPorts; i++, port++) {
677 port->board = brd;
678 port->DCDState = 0;
679 port->tableAddr = baseAddr + Extern_table +
680 Extern_size * i;
681 ofsAddr = port->tableAddr;
682 writew(C218rx_mask, ofsAddr + RX_mask);
683 writew(C218tx_mask, ofsAddr + TX_mask);
684 writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
685 writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
686
687 writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
688 writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
689
690 }
691 break;
692 default:
693 port = brd->ports;
694 for (i = 0; i < brd->numPorts; i++, port++) {
695 port->board = brd;
696 port->DCDState = 0;
697 port->tableAddr = baseAddr + Extern_table +
698 Extern_size * i;
699 ofsAddr = port->tableAddr;
700 switch (brd->numPorts) {
701 case 8:
702 writew(C320p8rx_mask, ofsAddr + RX_mask);
703 writew(C320p8tx_mask, ofsAddr + TX_mask);
704 writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
705 writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
706 writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
707 writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
708
709 break;
710 case 16:
711 writew(C320p16rx_mask, ofsAddr + RX_mask);
712 writew(C320p16tx_mask, ofsAddr + TX_mask);
713 writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
714 writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
715 writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
716 writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
717 break;
718
719 case 24:
720 writew(C320p24rx_mask, ofsAddr + RX_mask);
721 writew(C320p24tx_mask, ofsAddr + TX_mask);
722 writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
723 writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
724 writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
725 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
726 break;
727 case 32:
728 writew(C320p32rx_mask, ofsAddr + RX_mask);
729 writew(C320p32tx_mask, ofsAddr + TX_mask);
730 writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
731 writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
732 writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
733 writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
734 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
735 break;
736 }
737 }
738 break;
739 }
740 return 0;
741 }
742
743 static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
744 {
745 const void *ptr = fw->data;
746 char rsn[64];
747 u16 lens[5];
748 size_t len;
749 unsigned int a, lenp, lencnt;
750 int ret = -EINVAL;
751 struct {
752 __le32 magic; /* 0x34303430 */
753 u8 reserved1[2];
754 u8 type; /* UNIX = 3 */
755 u8 model; /* C218T=1, C320T=2, CP204=3 */
756 u8 reserved2[8];
757 __le16 len[5];
758 } const *hdr = ptr;
759
760 BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
761
762 if (fw->size < MOXA_FW_HDRLEN) {
763 strcpy(rsn, "too short (even header won't fit)");
764 goto err;
765 }
766 if (hdr->magic != cpu_to_le32(0x30343034)) {
767 sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
768 goto err;
769 }
770 if (hdr->type != 3) {
771 sprintf(rsn, "not for linux, type is %u", hdr->type);
772 goto err;
773 }
774 if (moxa_check_fw_model(brd, hdr->model)) {
775 sprintf(rsn, "not for this card, model is %u", hdr->model);
776 goto err;
777 }
778
779 len = MOXA_FW_HDRLEN;
780 lencnt = hdr->model == 2 ? 5 : 3;
781 for (a = 0; a < ARRAY_SIZE(lens); a++) {
782 lens[a] = le16_to_cpu(hdr->len[a]);
783 if (lens[a] && len + lens[a] <= fw->size &&
784 moxa_check_fw(&fw->data[len]))
785 printk(KERN_WARNING "MOXA firmware: unexpected input "
786 "at offset %u, but going on\n", (u32)len);
787 if (!lens[a] && a < lencnt) {
788 sprintf(rsn, "too few entries in fw file");
789 goto err;
790 }
791 len += lens[a];
792 }
793
794 if (len != fw->size) {
795 sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
796 (u32)len);
797 goto err;
798 }
799
800 ptr += MOXA_FW_HDRLEN;
801 lenp = 0; /* bios */
802
803 strcpy(rsn, "read above");
804
805 ret = moxa_load_bios(brd, ptr, lens[lenp]);
806 if (ret)
807 goto err;
808
809 /* we skip the tty section (lens[1]), since we don't need it */
810 ptr += lens[lenp] + lens[lenp + 1];
811 lenp += 2; /* comm */
812
813 if (hdr->model == 2) {
814 ret = moxa_load_320b(brd, ptr, lens[lenp]);
815 if (ret)
816 goto err;
817 /* skip another tty */
818 ptr += lens[lenp] + lens[lenp + 1];
819 lenp += 2;
820 }
821
822 ret = moxa_load_code(brd, ptr, lens[lenp]);
823 if (ret)
824 goto err;
825
826 return 0;
827 err:
828 printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
829 return ret;
830 }
831
832 static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
833 {
834 const struct firmware *fw;
835 const char *file;
836 struct moxa_port *p;
837 unsigned int i, first_idx;
838 int ret;
839
840 brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
841 GFP_KERNEL);
842 if (brd->ports == NULL) {
843 printk(KERN_ERR "cannot allocate memory for ports\n");
844 ret = -ENOMEM;
845 goto err;
846 }
847
848 for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
849 tty_port_init(&p->port);
850 p->port.ops = &moxa_port_ops;
851 p->type = PORT_16550A;
852 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
853 }
854
855 switch (brd->boardType) {
856 case MOXA_BOARD_C218_ISA:
857 case MOXA_BOARD_C218_PCI:
858 file = "c218tunx.cod";
859 break;
860 case MOXA_BOARD_CP204J:
861 file = "cp204unx.cod";
862 break;
863 default:
864 file = "c320tunx.cod";
865 break;
866 }
867
868 ret = request_firmware(&fw, file, dev);
869 if (ret) {
870 printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
871 "you've placed '%s' file into your firmware "
872 "loader directory (e.g. /lib/firmware)\n",
873 file);
874 goto err_free;
875 }
876
877 ret = moxa_load_fw(brd, fw);
878
879 release_firmware(fw);
880
881 if (ret)
882 goto err_free;
883
884 spin_lock_bh(&moxa_lock);
885 brd->ready = 1;
886 if (!timer_pending(&moxaTimer))
887 mod_timer(&moxaTimer, jiffies + HZ / 50);
888 spin_unlock_bh(&moxa_lock);
889
890 first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
891 for (i = 0; i < brd->numPorts; i++)
892 tty_port_register_device(&brd->ports[i].port, moxaDriver,
893 first_idx + i, dev);
894
895 return 0;
896 err_free:
897 for (i = 0; i < MAX_PORTS_PER_BOARD; i++)
898 tty_port_destroy(&brd->ports[i].port);
899 kfree(brd->ports);
900 err:
901 return ret;
902 }
903
904 static void moxa_board_deinit(struct moxa_board_conf *brd)
905 {
906 unsigned int a, opened, first_idx;
907
908 mutex_lock(&moxa_openlock);
909 spin_lock_bh(&moxa_lock);
910 brd->ready = 0;
911 spin_unlock_bh(&moxa_lock);
912
913 /* pci hot-un-plug support */
914 for (a = 0; a < brd->numPorts; a++)
915 if (tty_port_initialized(&brd->ports[a].port))
916 tty_port_tty_hangup(&brd->ports[a].port, false);
917
918 for (a = 0; a < MAX_PORTS_PER_BOARD; a++)
919 tty_port_destroy(&brd->ports[a].port);
920
921 while (1) {
922 opened = 0;
923 for (a = 0; a < brd->numPorts; a++)
924 if (tty_port_initialized(&brd->ports[a].port))
925 opened++;
926 mutex_unlock(&moxa_openlock);
927 if (!opened)
928 break;
929 msleep(50);
930 mutex_lock(&moxa_openlock);
931 }
932
933 first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
934 for (a = 0; a < brd->numPorts; a++)
935 tty_unregister_device(moxaDriver, first_idx + a);
936
937 iounmap(brd->basemem);
938 brd->basemem = NULL;
939 kfree(brd->ports);
940 }
941
942 #ifdef CONFIG_PCI
943 static int moxa_pci_probe(struct pci_dev *pdev,
944 const struct pci_device_id *ent)
945 {
946 struct moxa_board_conf *board;
947 unsigned int i;
948 int board_type = ent->driver_data;
949 int retval;
950
951 retval = pci_enable_device(pdev);
952 if (retval) {
953 dev_err(&pdev->dev, "can't enable pci device\n");
954 goto err;
955 }
956
957 for (i = 0; i < MAX_BOARDS; i++)
958 if (moxa_boards[i].basemem == NULL)
959 break;
960
961 retval = -ENODEV;
962 if (i >= MAX_BOARDS) {
963 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
964 "found. Board is ignored.\n", MAX_BOARDS);
965 goto err;
966 }
967
968 board = &moxa_boards[i];
969
970 retval = pci_request_region(pdev, 2, "moxa-base");
971 if (retval) {
972 dev_err(&pdev->dev, "can't request pci region 2\n");
973 goto err;
974 }
975
976 board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
977 if (board->basemem == NULL) {
978 dev_err(&pdev->dev, "can't remap io space 2\n");
979 retval = -ENOMEM;
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 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 = 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 (IS_ERR(moxaDriver))
1051 return PTR_ERR(moxaDriver);
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%.8lx 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 (!tty_port_initialized(&ch->port)) {
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 tty_port_set_initialized(&ch->port, 1);
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 unsigned long flags;
1364 dcd = !!dcd;
1365
1366 spin_lock_irqsave(&p->port.lock, flags);
1367 if (dcd != p->DCDState) {
1368 p->DCDState = dcd;
1369 spin_unlock_irqrestore(&p->port.lock, flags);
1370 if (!dcd)
1371 tty_port_tty_hangup(&p->port, true);
1372 }
1373 else
1374 spin_unlock_irqrestore(&p->port.lock, flags);
1375 }
1376
1377 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1378 u16 __iomem *ip)
1379 {
1380 struct tty_struct *tty = tty_port_tty_get(&p->port);
1381 void __iomem *ofsAddr;
1382 unsigned int inited = tty_port_initialized(&p->port);
1383 u16 intr;
1384
1385 if (tty) {
1386 if (test_bit(EMPTYWAIT, &p->statusflags) &&
1387 MoxaPortTxQueue(p) == 0) {
1388 clear_bit(EMPTYWAIT, &p->statusflags);
1389 tty_wakeup(tty);
1390 }
1391 if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
1392 MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1393 clear_bit(LOWWAIT, &p->statusflags);
1394 tty_wakeup(tty);
1395 }
1396
1397 if (inited && !tty_throttled(tty) &&
1398 MoxaPortRxQueue(p) > 0) { /* RX */
1399 MoxaPortReadData(p);
1400 tty_schedule_flip(&p->port);
1401 }
1402 } else {
1403 clear_bit(EMPTYWAIT, &p->statusflags);
1404 MoxaPortFlushData(p, 0); /* flush RX */
1405 }
1406
1407 if (!handle) /* nothing else to do */
1408 goto put;
1409
1410 intr = readw(ip); /* port irq status */
1411 if (intr == 0)
1412 goto put;
1413
1414 writew(0, ip); /* ACK port */
1415 ofsAddr = p->tableAddr;
1416 if (intr & IntrTx) /* disable tx intr */
1417 writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1418 ofsAddr + HostStat);
1419
1420 if (!inited)
1421 goto put;
1422
1423 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1424 tty_insert_flip_char(&p->port, 0, TTY_BREAK);
1425 tty_schedule_flip(&p->port);
1426 }
1427
1428 if (intr & IntrLine)
1429 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1430 put:
1431 tty_kref_put(tty);
1432
1433 return 0;
1434 }
1435
1436 static void moxa_poll(unsigned long ignored)
1437 {
1438 struct moxa_board_conf *brd;
1439 u16 __iomem *ip;
1440 unsigned int card, port, served = 0;
1441
1442 spin_lock(&moxa_lock);
1443 for (card = 0; card < MAX_BOARDS; card++) {
1444 brd = &moxa_boards[card];
1445 if (!brd->ready)
1446 continue;
1447
1448 served++;
1449
1450 ip = NULL;
1451 if (readb(brd->intPend) == 0xff)
1452 ip = brd->intTable + readb(brd->intNdx);
1453
1454 for (port = 0; port < brd->numPorts; port++)
1455 moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1456
1457 if (ip)
1458 writeb(0, brd->intPend); /* ACK */
1459
1460 if (moxaLowWaterChk) {
1461 struct moxa_port *p = brd->ports;
1462 for (port = 0; port < brd->numPorts; port++, p++)
1463 if (p->lowChkFlag) {
1464 p->lowChkFlag = 0;
1465 moxa_low_water_check(p->tableAddr);
1466 }
1467 }
1468 }
1469 moxaLowWaterChk = 0;
1470
1471 if (served)
1472 mod_timer(&moxaTimer, jiffies + HZ / 50);
1473 spin_unlock(&moxa_lock);
1474 }
1475
1476 /******************************************************************************/
1477
1478 static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1479 {
1480 register struct ktermios *ts = &tty->termios;
1481 struct moxa_port *ch = tty->driver_data;
1482 int rts, cts, txflow, rxflow, xany, baud;
1483
1484 rts = cts = txflow = rxflow = xany = 0;
1485 if (ts->c_cflag & CRTSCTS)
1486 rts = cts = 1;
1487 if (ts->c_iflag & IXON)
1488 txflow = 1;
1489 if (ts->c_iflag & IXOFF)
1490 rxflow = 1;
1491 if (ts->c_iflag & IXANY)
1492 xany = 1;
1493
1494 /* Clear the features we don't support */
1495 ts->c_cflag &= ~CMSPAR;
1496 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1497 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1498 if (baud == -1)
1499 baud = tty_termios_baud_rate(old_termios);
1500 /* Not put the baud rate into the termios data */
1501 tty_encode_baud_rate(tty, baud, baud);
1502 }
1503
1504 /*****************************************************************************
1505 * Driver level functions: *
1506 *****************************************************************************/
1507
1508 static void MoxaPortFlushData(struct moxa_port *port, int mode)
1509 {
1510 void __iomem *ofsAddr;
1511 if (mode < 0 || mode > 2)
1512 return;
1513 ofsAddr = port->tableAddr;
1514 moxafunc(ofsAddr, FC_FlushQueue, mode);
1515 if (mode != 1) {
1516 port->lowChkFlag = 0;
1517 moxa_low_water_check(ofsAddr);
1518 }
1519 }
1520
1521 /*
1522 * Moxa Port Number Description:
1523 *
1524 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1525 * the port number using in MOXA driver functions will be 0 to 31 for
1526 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1527 * to 127 for fourth. For example, if you setup three MOXA boards,
1528 * first board is C218, second board is C320-16 and third board is
1529 * C320-32. The port number of first board (C218 - 8 ports) is from
1530 * 0 to 7. The port number of second board (C320 - 16 ports) is form
1531 * 32 to 47. The port number of third board (C320 - 32 ports) is from
1532 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1533 * 127 will be invalid.
1534 *
1535 *
1536 * Moxa Functions Description:
1537 *
1538 * Function 1: Driver initialization routine, this routine must be
1539 * called when initialized driver.
1540 * Syntax:
1541 * void MoxaDriverInit();
1542 *
1543 *
1544 * Function 2: Moxa driver private IOCTL command processing.
1545 * Syntax:
1546 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1547 *
1548 * unsigned int cmd : IOCTL command
1549 * unsigned long arg : IOCTL argument
1550 * int port : port number (0 - 127)
1551 *
1552 * return: 0 (OK)
1553 * -EINVAL
1554 * -ENOIOCTLCMD
1555 *
1556 *
1557 * Function 6: Enable this port to start Tx/Rx data.
1558 * Syntax:
1559 * void MoxaPortEnable(int port);
1560 * int port : port number (0 - 127)
1561 *
1562 *
1563 * Function 7: Disable this port
1564 * Syntax:
1565 * void MoxaPortDisable(int port);
1566 * int port : port number (0 - 127)
1567 *
1568 *
1569 * Function 10: Setting baud rate of this port.
1570 * Syntax:
1571 * speed_t MoxaPortSetBaud(int port, speed_t baud);
1572 * int port : port number (0 - 127)
1573 * long baud : baud rate (50 - 115200)
1574 *
1575 * return: 0 : this port is invalid or baud < 50
1576 * 50 - 115200 : the real baud rate set to the port, if
1577 * the argument baud is large than maximun
1578 * available baud rate, the real setting
1579 * baud rate will be the maximun baud rate.
1580 *
1581 *
1582 * Function 12: Configure the port.
1583 * Syntax:
1584 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1585 * int port : port number (0 - 127)
1586 * struct ktermios * termio : termio structure pointer
1587 * speed_t baud : baud rate
1588 *
1589 * return: -1 : this port is invalid or termio == NULL
1590 * 0 : setting O.K.
1591 *
1592 *
1593 * Function 13: Get the DTR/RTS state of this port.
1594 * Syntax:
1595 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1596 * int port : port number (0 - 127)
1597 * int * dtrState : pointer to INT to receive the current DTR
1598 * state. (if NULL, this function will not
1599 * write to this address)
1600 * int * rtsState : pointer to INT to receive the current RTS
1601 * state. (if NULL, this function will not
1602 * write to this address)
1603 *
1604 * return: -1 : this port is invalid
1605 * 0 : O.K.
1606 *
1607 *
1608 * Function 14: Setting the DTR/RTS output state of this port.
1609 * Syntax:
1610 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1611 * int port : port number (0 - 127)
1612 * int dtrState : DTR output state (0: off, 1: on)
1613 * int rtsState : RTS output state (0: off, 1: on)
1614 *
1615 *
1616 * Function 15: Setting the flow control of this port.
1617 * Syntax:
1618 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1619 * int txFlow,int xany);
1620 * int port : port number (0 - 127)
1621 * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1622 * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1623 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1624 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1625 * int xany : S/W XANY flow control (0: no, 1: yes)
1626 *
1627 *
1628 * Function 16: Get ths line status of this port
1629 * Syntax:
1630 * int MoxaPortLineStatus(int port);
1631 * int port : port number (0 - 127)
1632 *
1633 * return: Bit 0 - CTS state (0: off, 1: on)
1634 * Bit 1 - DSR state (0: off, 1: on)
1635 * Bit 2 - DCD state (0: off, 1: on)
1636 *
1637 *
1638 * Function 19: Flush the Rx/Tx buffer data of this port.
1639 * Syntax:
1640 * void MoxaPortFlushData(int port, int mode);
1641 * int port : port number (0 - 127)
1642 * int mode
1643 * 0 : flush the Rx buffer
1644 * 1 : flush the Tx buffer
1645 * 2 : flush the Rx and Tx buffer
1646 *
1647 *
1648 * Function 20: Write data.
1649 * Syntax:
1650 * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1651 * int port : port number (0 - 127)
1652 * unsigned char * buffer : pointer to write data buffer.
1653 * int length : write data length
1654 *
1655 * return: 0 - length : real write data length
1656 *
1657 *
1658 * Function 21: Read data.
1659 * Syntax:
1660 * int MoxaPortReadData(int port, struct tty_struct *tty);
1661 * int port : port number (0 - 127)
1662 * struct tty_struct *tty : tty for data
1663 *
1664 * return: 0 - length : real read data length
1665 *
1666 *
1667 * Function 24: Get the Tx buffer current queued data bytes
1668 * Syntax:
1669 * int MoxaPortTxQueue(int port);
1670 * int port : port number (0 - 127)
1671 *
1672 * return: .. : Tx buffer current queued data bytes
1673 *
1674 *
1675 * Function 25: Get the Tx buffer current free space
1676 * Syntax:
1677 * int MoxaPortTxFree(int port);
1678 * int port : port number (0 - 127)
1679 *
1680 * return: .. : Tx buffer current free space
1681 *
1682 *
1683 * Function 26: Get the Rx buffer current queued data bytes
1684 * Syntax:
1685 * int MoxaPortRxQueue(int port);
1686 * int port : port number (0 - 127)
1687 *
1688 * return: .. : Rx buffer current queued data bytes
1689 *
1690 *
1691 * Function 28: Disable port data transmission.
1692 * Syntax:
1693 * void MoxaPortTxDisable(int port);
1694 * int port : port number (0 - 127)
1695 *
1696 *
1697 * Function 29: Enable port data transmission.
1698 * Syntax:
1699 * void MoxaPortTxEnable(int port);
1700 * int port : port number (0 - 127)
1701 *
1702 *
1703 * Function 31: Get the received BREAK signal count and reset it.
1704 * Syntax:
1705 * int MoxaPortResetBrkCnt(int port);
1706 * int port : port number (0 - 127)
1707 *
1708 * return: 0 - .. : BREAK signal count
1709 *
1710 *
1711 */
1712
1713 static void MoxaPortEnable(struct moxa_port *port)
1714 {
1715 void __iomem *ofsAddr;
1716 u16 lowwater = 512;
1717
1718 ofsAddr = port->tableAddr;
1719 writew(lowwater, ofsAddr + Low_water);
1720 if (MOXA_IS_320(port->board))
1721 moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1722 else
1723 writew(readw(ofsAddr + HostStat) | WakeupBreak,
1724 ofsAddr + HostStat);
1725
1726 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1727 moxafunc(ofsAddr, FC_FlushQueue, 2);
1728
1729 moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1730 MoxaPortLineStatus(port);
1731 }
1732
1733 static void MoxaPortDisable(struct moxa_port *port)
1734 {
1735 void __iomem *ofsAddr = port->tableAddr;
1736
1737 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1738 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1739 writew(0, ofsAddr + HostStat);
1740 moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1741 }
1742
1743 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1744 {
1745 void __iomem *ofsAddr = port->tableAddr;
1746 unsigned int clock, val;
1747 speed_t max;
1748
1749 max = MOXA_IS_320(port->board) ? 460800 : 921600;
1750 if (baud < 50)
1751 return 0;
1752 if (baud > max)
1753 baud = max;
1754 clock = 921600;
1755 val = clock / baud;
1756 moxafunc(ofsAddr, FC_SetBaud, val);
1757 baud = clock / val;
1758 return baud;
1759 }
1760
1761 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1762 speed_t baud)
1763 {
1764 void __iomem *ofsAddr;
1765 tcflag_t mode = 0;
1766
1767 ofsAddr = port->tableAddr;
1768
1769 mode = termio->c_cflag & CSIZE;
1770 if (mode == CS5)
1771 mode = MX_CS5;
1772 else if (mode == CS6)
1773 mode = MX_CS6;
1774 else if (mode == CS7)
1775 mode = MX_CS7;
1776 else if (mode == CS8)
1777 mode = MX_CS8;
1778
1779 if (termio->c_cflag & CSTOPB) {
1780 if (mode == MX_CS5)
1781 mode |= MX_STOP15;
1782 else
1783 mode |= MX_STOP2;
1784 } else
1785 mode |= MX_STOP1;
1786
1787 if (termio->c_cflag & PARENB) {
1788 if (termio->c_cflag & PARODD)
1789 mode |= MX_PARODD;
1790 else
1791 mode |= MX_PAREVEN;
1792 } else
1793 mode |= MX_PARNONE;
1794
1795 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1796
1797 if (MOXA_IS_320(port->board) && baud >= 921600)
1798 return -1;
1799
1800 baud = MoxaPortSetBaud(port, baud);
1801
1802 if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1803 spin_lock_irq(&moxafunc_lock);
1804 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1805 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1806 writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1807 moxa_wait_finish(ofsAddr);
1808 spin_unlock_irq(&moxafunc_lock);
1809
1810 }
1811 return baud;
1812 }
1813
1814 static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1815 int *rtsState)
1816 {
1817 if (dtrState)
1818 *dtrState = !!(port->lineCtrl & DTR_ON);
1819 if (rtsState)
1820 *rtsState = !!(port->lineCtrl & RTS_ON);
1821
1822 return 0;
1823 }
1824
1825 static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1826 {
1827 u8 mode = 0;
1828
1829 if (dtr)
1830 mode |= DTR_ON;
1831 if (rts)
1832 mode |= RTS_ON;
1833 port->lineCtrl = mode;
1834 moxafunc(port->tableAddr, FC_LineControl, mode);
1835 }
1836
1837 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1838 int txflow, int rxflow, int txany)
1839 {
1840 int mode = 0;
1841
1842 if (rts)
1843 mode |= RTS_FlowCtl;
1844 if (cts)
1845 mode |= CTS_FlowCtl;
1846 if (txflow)
1847 mode |= Tx_FlowCtl;
1848 if (rxflow)
1849 mode |= Rx_FlowCtl;
1850 if (txany)
1851 mode |= IXM_IXANY;
1852 moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1853 }
1854
1855 static int MoxaPortLineStatus(struct moxa_port *port)
1856 {
1857 void __iomem *ofsAddr;
1858 int val;
1859
1860 ofsAddr = port->tableAddr;
1861 if (MOXA_IS_320(port->board))
1862 val = moxafuncret(ofsAddr, FC_LineStatus, 0);
1863 else
1864 val = readw(ofsAddr + FlagStat) >> 4;
1865 val &= 0x0B;
1866 if (val & 8)
1867 val |= 4;
1868 moxa_new_dcdstate(port, val & 8);
1869 val &= 7;
1870 return val;
1871 }
1872
1873 static int MoxaPortWriteData(struct tty_struct *tty,
1874 const unsigned char *buffer, int len)
1875 {
1876 struct moxa_port *port = tty->driver_data;
1877 void __iomem *baseAddr, *ofsAddr, *ofs;
1878 unsigned int c, total;
1879 u16 head, tail, tx_mask, spage, epage;
1880 u16 pageno, pageofs, bufhead;
1881
1882 ofsAddr = port->tableAddr;
1883 baseAddr = port->board->basemem;
1884 tx_mask = readw(ofsAddr + TX_mask);
1885 spage = readw(ofsAddr + Page_txb);
1886 epage = readw(ofsAddr + EndPage_txb);
1887 tail = readw(ofsAddr + TXwptr);
1888 head = readw(ofsAddr + TXrptr);
1889 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1890 if (c > len)
1891 c = len;
1892 moxaLog.txcnt[port->port.tty->index] += c;
1893 total = c;
1894 if (spage == epage) {
1895 bufhead = readw(ofsAddr + Ofs_txb);
1896 writew(spage, baseAddr + Control_reg);
1897 while (c > 0) {
1898 if (head > tail)
1899 len = head - tail - 1;
1900 else
1901 len = tx_mask + 1 - tail;
1902 len = (c > len) ? len : c;
1903 ofs = baseAddr + DynPage_addr + bufhead + tail;
1904 memcpy_toio(ofs, buffer, len);
1905 buffer += len;
1906 tail = (tail + len) & tx_mask;
1907 c -= len;
1908 }
1909 } else {
1910 pageno = spage + (tail >> 13);
1911 pageofs = tail & Page_mask;
1912 while (c > 0) {
1913 len = Page_size - pageofs;
1914 if (len > c)
1915 len = c;
1916 writeb(pageno, baseAddr + Control_reg);
1917 ofs = baseAddr + DynPage_addr + pageofs;
1918 memcpy_toio(ofs, buffer, len);
1919 buffer += len;
1920 if (++pageno == epage)
1921 pageno = spage;
1922 pageofs = 0;
1923 c -= len;
1924 }
1925 tail = (tail + total) & tx_mask;
1926 }
1927 writew(tail, ofsAddr + TXwptr);
1928 writeb(1, ofsAddr + CD180TXirq); /* start to send */
1929 return total;
1930 }
1931
1932 static int MoxaPortReadData(struct moxa_port *port)
1933 {
1934 struct tty_struct *tty = port->port.tty;
1935 unsigned char *dst;
1936 void __iomem *baseAddr, *ofsAddr, *ofs;
1937 unsigned int count, len, total;
1938 u16 tail, rx_mask, spage, epage;
1939 u16 pageno, pageofs, bufhead, head;
1940
1941 ofsAddr = port->tableAddr;
1942 baseAddr = port->board->basemem;
1943 head = readw(ofsAddr + RXrptr);
1944 tail = readw(ofsAddr + RXwptr);
1945 rx_mask = readw(ofsAddr + RX_mask);
1946 spage = readw(ofsAddr + Page_rxb);
1947 epage = readw(ofsAddr + EndPage_rxb);
1948 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
1949 if (count == 0)
1950 return 0;
1951
1952 total = count;
1953 moxaLog.rxcnt[tty->index] += total;
1954 if (spage == epage) {
1955 bufhead = readw(ofsAddr + Ofs_rxb);
1956 writew(spage, baseAddr + Control_reg);
1957 while (count > 0) {
1958 ofs = baseAddr + DynPage_addr + bufhead + head;
1959 len = (tail >= head) ? (tail - head) :
1960 (rx_mask + 1 - head);
1961 len = tty_prepare_flip_string(&port->port, &dst,
1962 min(len, count));
1963 memcpy_fromio(dst, ofs, len);
1964 head = (head + len) & rx_mask;
1965 count -= len;
1966 }
1967 } else {
1968 pageno = spage + (head >> 13);
1969 pageofs = head & Page_mask;
1970 while (count > 0) {
1971 writew(pageno, baseAddr + Control_reg);
1972 ofs = baseAddr + DynPage_addr + pageofs;
1973 len = tty_prepare_flip_string(&port->port, &dst,
1974 min(Page_size - pageofs, count));
1975 memcpy_fromio(dst, ofs, len);
1976
1977 count -= len;
1978 pageofs = (pageofs + len) & Page_mask;
1979 if (pageofs == 0 && ++pageno == epage)
1980 pageno = spage;
1981 }
1982 head = (head + total) & rx_mask;
1983 }
1984 writew(head, ofsAddr + RXrptr);
1985 if (readb(ofsAddr + FlagStat) & Xoff_state) {
1986 moxaLowWaterChk = 1;
1987 port->lowChkFlag = 1;
1988 }
1989 return total;
1990 }
1991
1992
1993 static int MoxaPortTxQueue(struct moxa_port *port)
1994 {
1995 void __iomem *ofsAddr = port->tableAddr;
1996 u16 rptr, wptr, mask;
1997
1998 rptr = readw(ofsAddr + TXrptr);
1999 wptr = readw(ofsAddr + TXwptr);
2000 mask = readw(ofsAddr + TX_mask);
2001 return (wptr - rptr) & mask;
2002 }
2003
2004 static int MoxaPortTxFree(struct moxa_port *port)
2005 {
2006 void __iomem *ofsAddr = port->tableAddr;
2007 u16 rptr, wptr, mask;
2008
2009 rptr = readw(ofsAddr + TXrptr);
2010 wptr = readw(ofsAddr + TXwptr);
2011 mask = readw(ofsAddr + TX_mask);
2012 return mask - ((wptr - rptr) & mask);
2013 }
2014
2015 static int MoxaPortRxQueue(struct moxa_port *port)
2016 {
2017 void __iomem *ofsAddr = port->tableAddr;
2018 u16 rptr, wptr, mask;
2019
2020 rptr = readw(ofsAddr + RXrptr);
2021 wptr = readw(ofsAddr + RXwptr);
2022 mask = readw(ofsAddr + RX_mask);
2023 return (wptr - rptr) & mask;
2024 }
2025
2026 static void MoxaPortTxDisable(struct moxa_port *port)
2027 {
2028 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2029 }
2030
2031 static void MoxaPortTxEnable(struct moxa_port *port)
2032 {
2033 moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2034 }
2035
2036 static int moxa_get_serial_info(struct moxa_port *info,
2037 struct serial_struct __user *retinfo)
2038 {
2039 struct serial_struct tmp = {
2040 .type = info->type,
2041 .line = info->port.tty->index,
2042 .flags = info->port.flags,
2043 .baud_base = 921600,
2044 .close_delay = info->port.close_delay
2045 };
2046 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2047 }
2048
2049
2050 static int moxa_set_serial_info(struct moxa_port *info,
2051 struct serial_struct __user *new_info)
2052 {
2053 struct serial_struct new_serial;
2054
2055 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2056 return -EFAULT;
2057
2058 if (new_serial.irq != 0 || new_serial.port != 0 ||
2059 new_serial.custom_divisor != 0 ||
2060 new_serial.baud_base != 921600)
2061 return -EPERM;
2062
2063 if (!capable(CAP_SYS_ADMIN)) {
2064 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2065 (info->port.flags & ~ASYNC_USR_MASK)))
2066 return -EPERM;
2067 } else
2068 info->port.close_delay = new_serial.close_delay * HZ / 100;
2069
2070 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2071 new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2072
2073 MoxaSetFifo(info, new_serial.type == PORT_16550A);
2074
2075 info->type = new_serial.type;
2076 return 0;
2077 }
2078
2079
2080
2081 /*****************************************************************************
2082 * Static local functions: *
2083 *****************************************************************************/
2084
2085 static void MoxaSetFifo(struct moxa_port *port, int enable)
2086 {
2087 void __iomem *ofsAddr = port->tableAddr;
2088
2089 if (!enable) {
2090 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2091 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2092 } else {
2093 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2094 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2095 }
2096 }
Linux with added FPC-III support