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tty: kref usage for isicom and moxa
[mirror_ubuntu-artful-kernel.git] / drivers / char / moxa.c
1 /*****************************************************************************/
2 /*
3 * moxa.c -- MOXA Intellio family multiport serial driver.
4 *
5 * Copyright (C) 1999-2000 Moxa Technologies (support@moxa.com).
6 * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
7 *
8 * This code is loosely based on the Linux serial driver, written by
9 * Linus Torvalds, Theodore T'so and others.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 */
16
17 /*
18 * MOXA Intellio Series Driver
19 * for : LINUX
20 * date : 1999/1/7
21 * version : 5.1
22 */
23
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/mm.h>
27 #include <linux/ioport.h>
28 #include <linux/errno.h>
29 #include <linux/firmware.h>
30 #include <linux/signal.h>
31 #include <linux/sched.h>
32 #include <linux/timer.h>
33 #include <linux/interrupt.h>
34 #include <linux/tty.h>
35 #include <linux/tty_flip.h>
36 #include <linux/major.h>
37 #include <linux/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;
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 0x1
154 #define LOWWAIT 0x2
155 #define EMPTYWAIT 0x4
156 #define THROTTLE 0x8
157
158 #define SERIAL_DO_RESTART
159
160 #define WAKEUP_CHARS 256
161
162 static int ttymajor = MOXAMAJOR;
163 static struct mon_str moxaLog;
164 static unsigned int moxaFuncTout = HZ / 2;
165 static unsigned int moxaLowWaterChk;
166 static DEFINE_MUTEX(moxa_openlock);
167 /* Variables for insmod */
168 #ifdef MODULE
169 static unsigned long baseaddr[MAX_BOARDS];
170 static unsigned int type[MAX_BOARDS];
171 static unsigned int numports[MAX_BOARDS];
172 #endif
173
174 MODULE_AUTHOR("William Chen");
175 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
176 MODULE_LICENSE("GPL");
177 #ifdef MODULE
178 module_param_array(type, uint, NULL, 0);
179 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
180 module_param_array(baseaddr, ulong, NULL, 0);
181 MODULE_PARM_DESC(baseaddr, "base address");
182 module_param_array(numports, uint, NULL, 0);
183 MODULE_PARM_DESC(numports, "numports (ignored for C218)");
184 #endif
185 module_param(ttymajor, int, 0);
186
187 /*
188 * static functions:
189 */
190 static int moxa_open(struct tty_struct *, struct file *);
191 static void moxa_close(struct tty_struct *, struct file *);
192 static int moxa_write(struct tty_struct *, const unsigned char *, int);
193 static int moxa_write_room(struct tty_struct *);
194 static void moxa_flush_buffer(struct tty_struct *);
195 static int moxa_chars_in_buffer(struct tty_struct *);
196 static void moxa_throttle(struct tty_struct *);
197 static void moxa_unthrottle(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, struct file *file);
203 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
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_setup_empty_event(struct tty_struct *);
208 static void moxa_shut_down(struct tty_struct *);
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 void moxa_wait_finish(void __iomem *ofsAddr)
236 {
237 unsigned long end = jiffies + moxaFuncTout;
238
239 while (readw(ofsAddr + FuncCode) != 0)
240 if (time_after(jiffies, end))
241 return;
242 if (readw(ofsAddr + FuncCode) != 0 && printk_ratelimit())
243 printk(KERN_WARNING "moxa function expired\n");
244 }
245
246 static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
247 {
248 writew(arg, ofsAddr + FuncArg);
249 writew(cmd, ofsAddr + FuncCode);
250 moxa_wait_finish(ofsAddr);
251 }
252
253 static void moxa_low_water_check(void __iomem *ofsAddr)
254 {
255 u16 rptr, wptr, mask, len;
256
257 if (readb(ofsAddr + FlagStat) & Xoff_state) {
258 rptr = readw(ofsAddr + RXrptr);
259 wptr = readw(ofsAddr + RXwptr);
260 mask = readw(ofsAddr + RX_mask);
261 len = (wptr - rptr) & mask;
262 if (len <= Low_water)
263 moxafunc(ofsAddr, FC_SendXon, 0);
264 }
265 }
266
267 /*
268 * TTY operations
269 */
270
271 static int moxa_ioctl(struct tty_struct *tty, struct file *file,
272 unsigned int cmd, unsigned long arg)
273 {
274 struct moxa_port *ch = tty->driver_data;
275 void __user *argp = (void __user *)arg;
276 int status, ret = 0;
277
278 if (tty->index == MAX_PORTS) {
279 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
280 cmd != MOXA_GETMSTATUS)
281 return -EINVAL;
282 } else if (!ch)
283 return -ENODEV;
284
285 switch (cmd) {
286 case MOXA_GETDATACOUNT:
287 moxaLog.tick = jiffies;
288 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
289 ret = -EFAULT;
290 break;
291 case MOXA_FLUSH_QUEUE:
292 MoxaPortFlushData(ch, arg);
293 break;
294 case MOXA_GET_IOQUEUE: {
295 struct moxaq_str __user *argm = argp;
296 struct moxaq_str tmp;
297 struct moxa_port *p;
298 unsigned int i, j;
299
300 mutex_lock(&moxa_openlock);
301 for (i = 0; i < MAX_BOARDS; i++) {
302 p = moxa_boards[i].ports;
303 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
304 memset(&tmp, 0, sizeof(tmp));
305 if (moxa_boards[i].ready) {
306 tmp.inq = MoxaPortRxQueue(p);
307 tmp.outq = MoxaPortTxQueue(p);
308 }
309 if (copy_to_user(argm, &tmp, sizeof(tmp))) {
310 mutex_unlock(&moxa_openlock);
311 return -EFAULT;
312 }
313 }
314 }
315 mutex_unlock(&moxa_openlock);
316 break;
317 } case MOXA_GET_OQUEUE:
318 status = MoxaPortTxQueue(ch);
319 ret = put_user(status, (unsigned long __user *)argp);
320 break;
321 case MOXA_GET_IQUEUE:
322 status = MoxaPortRxQueue(ch);
323 ret = put_user(status, (unsigned long __user *)argp);
324 break;
325 case MOXA_GETMSTATUS: {
326 struct mxser_mstatus __user *argm = argp;
327 struct mxser_mstatus tmp;
328 struct moxa_port *p;
329 unsigned int i, j;
330
331 mutex_lock(&moxa_openlock);
332 for (i = 0; i < MAX_BOARDS; i++) {
333 p = moxa_boards[i].ports;
334 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
335 struct tty_struct *ttyp;
336 memset(&tmp, 0, sizeof(tmp));
337 if (!moxa_boards[i].ready)
338 goto copy;
339
340 status = MoxaPortLineStatus(p);
341 if (status & 1)
342 tmp.cts = 1;
343 if (status & 2)
344 tmp.dsr = 1;
345 if (status & 4)
346 tmp.dcd = 1;
347
348 ttyp = tty_port_tty_get(&p->port);
349 if (!ttyp || !ttyp->termios)
350 tmp.cflag = p->cflag;
351 else
352 tmp.cflag = ttyp->termios->c_cflag;
353 tty_kref_put(tty);
354 copy:
355 if (copy_to_user(argm, &tmp, sizeof(tmp))) {
356 mutex_unlock(&moxa_openlock);
357 return -EFAULT;
358 }
359 }
360 }
361 mutex_unlock(&moxa_openlock);
362 break;
363 }
364 case TIOCGSERIAL:
365 mutex_lock(&moxa_openlock);
366 ret = moxa_get_serial_info(ch, argp);
367 mutex_unlock(&moxa_openlock);
368 break;
369 case TIOCSSERIAL:
370 mutex_lock(&moxa_openlock);
371 ret = moxa_set_serial_info(ch, argp);
372 mutex_unlock(&moxa_openlock);
373 break;
374 default:
375 ret = -ENOIOCTLCMD;
376 }
377 return ret;
378 }
379
380 static int moxa_break_ctl(struct tty_struct *tty, int state)
381 {
382 struct moxa_port *port = tty->driver_data;
383
384 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
385 Magic_code);
386 return 0;
387 }
388
389 static const struct tty_operations moxa_ops = {
390 .open = moxa_open,
391 .close = moxa_close,
392 .write = moxa_write,
393 .write_room = moxa_write_room,
394 .flush_buffer = moxa_flush_buffer,
395 .chars_in_buffer = moxa_chars_in_buffer,
396 .ioctl = moxa_ioctl,
397 .throttle = moxa_throttle,
398 .unthrottle = moxa_unthrottle,
399 .set_termios = moxa_set_termios,
400 .stop = moxa_stop,
401 .start = moxa_start,
402 .hangup = moxa_hangup,
403 .break_ctl = moxa_break_ctl,
404 .tiocmget = moxa_tiocmget,
405 .tiocmset = moxa_tiocmset,
406 };
407
408 static struct tty_driver *moxaDriver;
409 static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
410 static DEFINE_SPINLOCK(moxa_lock);
411
412 /*
413 * HW init
414 */
415
416 static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
417 {
418 switch (brd->boardType) {
419 case MOXA_BOARD_C218_ISA:
420 case MOXA_BOARD_C218_PCI:
421 if (model != 1)
422 goto err;
423 break;
424 case MOXA_BOARD_CP204J:
425 if (model != 3)
426 goto err;
427 break;
428 default:
429 if (model != 2)
430 goto err;
431 break;
432 }
433 return 0;
434 err:
435 return -EINVAL;
436 }
437
438 static int moxa_check_fw(const void *ptr)
439 {
440 const __le16 *lptr = ptr;
441
442 if (*lptr != cpu_to_le16(0x7980))
443 return -EINVAL;
444
445 return 0;
446 }
447
448 static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
449 size_t len)
450 {
451 void __iomem *baseAddr = brd->basemem;
452 u16 tmp;
453
454 writeb(HW_reset, baseAddr + Control_reg); /* reset */
455 msleep(10);
456 memset_io(baseAddr, 0, 4096);
457 memcpy_toio(baseAddr, buf, len); /* download BIOS */
458 writeb(0, baseAddr + Control_reg); /* restart */
459
460 msleep(2000);
461
462 switch (brd->boardType) {
463 case MOXA_BOARD_C218_ISA:
464 case MOXA_BOARD_C218_PCI:
465 tmp = readw(baseAddr + C218_key);
466 if (tmp != C218_KeyCode)
467 goto err;
468 break;
469 case MOXA_BOARD_CP204J:
470 tmp = readw(baseAddr + C218_key);
471 if (tmp != CP204J_KeyCode)
472 goto err;
473 break;
474 default:
475 tmp = readw(baseAddr + C320_key);
476 if (tmp != C320_KeyCode)
477 goto err;
478 tmp = readw(baseAddr + C320_status);
479 if (tmp != STS_init) {
480 printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
481 "module not found\n");
482 return -EIO;
483 }
484 break;
485 }
486
487 return 0;
488 err:
489 printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
490 return -EIO;
491 }
492
493 static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
494 size_t len)
495 {
496 void __iomem *baseAddr = brd->basemem;
497
498 if (len < 7168) {
499 printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
500 return -EINVAL;
501 }
502
503 writew(len - 7168 - 2, baseAddr + C320bapi_len);
504 writeb(1, baseAddr + Control_reg); /* Select Page 1 */
505 memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
506 writeb(2, baseAddr + Control_reg); /* Select Page 2 */
507 memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
508
509 return 0;
510 }
511
512 static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
513 size_t len)
514 {
515 void __iomem *baseAddr = brd->basemem;
516 const u16 *uptr = ptr;
517 size_t wlen, len2, j;
518 unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
519 unsigned int i, retry;
520 u16 usum, keycode;
521
522 keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
523 C218_KeyCode;
524
525 switch (brd->boardType) {
526 case MOXA_BOARD_CP204J:
527 case MOXA_BOARD_C218_ISA:
528 case MOXA_BOARD_C218_PCI:
529 key = C218_key;
530 loadbuf = C218_LoadBuf;
531 loadlen = C218DLoad_len;
532 checksum = C218check_sum;
533 checksum_ok = C218chksum_ok;
534 break;
535 default:
536 key = C320_key;
537 keycode = C320_KeyCode;
538 loadbuf = C320_LoadBuf;
539 loadlen = C320DLoad_len;
540 checksum = C320check_sum;
541 checksum_ok = C320chksum_ok;
542 break;
543 }
544
545 usum = 0;
546 wlen = len >> 1;
547 for (i = 0; i < wlen; i++)
548 usum += le16_to_cpu(uptr[i]);
549 retry = 0;
550 do {
551 wlen = len >> 1;
552 j = 0;
553 while (wlen) {
554 len2 = (wlen > 2048) ? 2048 : wlen;
555 wlen -= len2;
556 memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
557 j += len2 << 1;
558
559 writew(len2, baseAddr + loadlen);
560 writew(0, baseAddr + key);
561 for (i = 0; i < 100; i++) {
562 if (readw(baseAddr + key) == keycode)
563 break;
564 msleep(10);
565 }
566 if (readw(baseAddr + key) != keycode)
567 return -EIO;
568 }
569 writew(0, baseAddr + loadlen);
570 writew(usum, baseAddr + checksum);
571 writew(0, baseAddr + key);
572 for (i = 0; i < 100; i++) {
573 if (readw(baseAddr + key) == keycode)
574 break;
575 msleep(10);
576 }
577 retry++;
578 } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
579 if (readb(baseAddr + checksum_ok) != 1)
580 return -EIO;
581
582 writew(0, baseAddr + key);
583 for (i = 0; i < 600; i++) {
584 if (readw(baseAddr + Magic_no) == Magic_code)
585 break;
586 msleep(10);
587 }
588 if (readw(baseAddr + Magic_no) != Magic_code)
589 return -EIO;
590
591 if (MOXA_IS_320(brd)) {
592 if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */
593 writew(0x3800, baseAddr + TMS320_PORT1);
594 writew(0x3900, baseAddr + TMS320_PORT2);
595 writew(28499, baseAddr + TMS320_CLOCK);
596 } else {
597 writew(0x3200, baseAddr + TMS320_PORT1);
598 writew(0x3400, baseAddr + TMS320_PORT2);
599 writew(19999, baseAddr + TMS320_CLOCK);
600 }
601 }
602 writew(1, baseAddr + Disable_IRQ);
603 writew(0, baseAddr + Magic_no);
604 for (i = 0; i < 500; 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 j = readw(baseAddr + Module_cnt);
614 if (j <= 0)
615 return -EIO;
616 brd->numPorts = j * 8;
617 writew(j, baseAddr + Module_no);
618 writew(0, baseAddr + Magic_no);
619 for (i = 0; i < 600; i++) {
620 if (readw(baseAddr + Magic_no) == Magic_code)
621 break;
622 msleep(10);
623 }
624 if (readw(baseAddr + Magic_no) != Magic_code)
625 return -EIO;
626 }
627 brd->intNdx = baseAddr + IRQindex;
628 brd->intPend = baseAddr + IRQpending;
629 brd->intTable = baseAddr + IRQtable;
630
631 return 0;
632 }
633
634 static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
635 size_t len)
636 {
637 void __iomem *ofsAddr, *baseAddr = brd->basemem;
638 struct moxa_port *port;
639 int retval, i;
640
641 if (len % 2) {
642 printk(KERN_ERR "MOXA: bios length is not even\n");
643 return -EINVAL;
644 }
645
646 retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
647 if (retval)
648 return retval;
649
650 switch (brd->boardType) {
651 case MOXA_BOARD_C218_ISA:
652 case MOXA_BOARD_C218_PCI:
653 case MOXA_BOARD_CP204J:
654 port = brd->ports;
655 for (i = 0; i < brd->numPorts; i++, port++) {
656 port->board = brd;
657 port->DCDState = 0;
658 port->tableAddr = baseAddr + Extern_table +
659 Extern_size * i;
660 ofsAddr = port->tableAddr;
661 writew(C218rx_mask, ofsAddr + RX_mask);
662 writew(C218tx_mask, ofsAddr + TX_mask);
663 writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
664 writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
665
666 writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
667 writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
668
669 }
670 break;
671 default:
672 port = brd->ports;
673 for (i = 0; i < brd->numPorts; i++, port++) {
674 port->board = brd;
675 port->DCDState = 0;
676 port->tableAddr = baseAddr + Extern_table +
677 Extern_size * i;
678 ofsAddr = port->tableAddr;
679 switch (brd->numPorts) {
680 case 8:
681 writew(C320p8rx_mask, ofsAddr + RX_mask);
682 writew(C320p8tx_mask, ofsAddr + TX_mask);
683 writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
684 writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
685 writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
686 writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
687
688 break;
689 case 16:
690 writew(C320p16rx_mask, ofsAddr + RX_mask);
691 writew(C320p16tx_mask, ofsAddr + TX_mask);
692 writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
693 writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
694 writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
695 writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
696 break;
697
698 case 24:
699 writew(C320p24rx_mask, ofsAddr + RX_mask);
700 writew(C320p24tx_mask, ofsAddr + TX_mask);
701 writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
702 writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
703 writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
704 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
705 break;
706 case 32:
707 writew(C320p32rx_mask, ofsAddr + RX_mask);
708 writew(C320p32tx_mask, ofsAddr + TX_mask);
709 writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
710 writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
711 writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
712 writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
713 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
714 break;
715 }
716 }
717 break;
718 }
719 return 0;
720 }
721
722 static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
723 {
724 const void *ptr = fw->data;
725 char rsn[64];
726 u16 lens[5];
727 size_t len;
728 unsigned int a, lenp, lencnt;
729 int ret = -EINVAL;
730 struct {
731 __le32 magic; /* 0x34303430 */
732 u8 reserved1[2];
733 u8 type; /* UNIX = 3 */
734 u8 model; /* C218T=1, C320T=2, CP204=3 */
735 u8 reserved2[8];
736 __le16 len[5];
737 } const *hdr = ptr;
738
739 BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
740
741 if (fw->size < MOXA_FW_HDRLEN) {
742 strcpy(rsn, "too short (even header won't fit)");
743 goto err;
744 }
745 if (hdr->magic != cpu_to_le32(0x30343034)) {
746 sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
747 goto err;
748 }
749 if (hdr->type != 3) {
750 sprintf(rsn, "not for linux, type is %u", hdr->type);
751 goto err;
752 }
753 if (moxa_check_fw_model(brd, hdr->model)) {
754 sprintf(rsn, "not for this card, model is %u", hdr->model);
755 goto err;
756 }
757
758 len = MOXA_FW_HDRLEN;
759 lencnt = hdr->model == 2 ? 5 : 3;
760 for (a = 0; a < ARRAY_SIZE(lens); a++) {
761 lens[a] = le16_to_cpu(hdr->len[a]);
762 if (lens[a] && len + lens[a] <= fw->size &&
763 moxa_check_fw(&fw->data[len]))
764 printk(KERN_WARNING "MOXA firmware: unexpected input "
765 "at offset %u, but going on\n", (u32)len);
766 if (!lens[a] && a < lencnt) {
767 sprintf(rsn, "too few entries in fw file");
768 goto err;
769 }
770 len += lens[a];
771 }
772
773 if (len != fw->size) {
774 sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
775 (u32)len);
776 goto err;
777 }
778
779 ptr += MOXA_FW_HDRLEN;
780 lenp = 0; /* bios */
781
782 strcpy(rsn, "read above");
783
784 ret = moxa_load_bios(brd, ptr, lens[lenp]);
785 if (ret)
786 goto err;
787
788 /* we skip the tty section (lens[1]), since we don't need it */
789 ptr += lens[lenp] + lens[lenp + 1];
790 lenp += 2; /* comm */
791
792 if (hdr->model == 2) {
793 ret = moxa_load_320b(brd, ptr, lens[lenp]);
794 if (ret)
795 goto err;
796 /* skip another tty */
797 ptr += lens[lenp] + lens[lenp + 1];
798 lenp += 2;
799 }
800
801 ret = moxa_load_code(brd, ptr, lens[lenp]);
802 if (ret)
803 goto err;
804
805 return 0;
806 err:
807 printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
808 return ret;
809 }
810
811 static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
812 {
813 const struct firmware *fw;
814 const char *file;
815 struct moxa_port *p;
816 unsigned int i;
817 int ret;
818
819 brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
820 GFP_KERNEL);
821 if (brd->ports == NULL) {
822 printk(KERN_ERR "cannot allocate memory for ports\n");
823 ret = -ENOMEM;
824 goto err;
825 }
826
827 for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
828 tty_port_init(&p->port);
829 p->type = PORT_16550A;
830 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
831 }
832
833 switch (brd->boardType) {
834 case MOXA_BOARD_C218_ISA:
835 case MOXA_BOARD_C218_PCI:
836 file = "c218tunx.cod";
837 break;
838 case MOXA_BOARD_CP204J:
839 file = "cp204unx.cod";
840 break;
841 default:
842 file = "c320tunx.cod";
843 break;
844 }
845
846 ret = request_firmware(&fw, file, dev);
847 if (ret) {
848 printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
849 "you've placed '%s' file into your firmware "
850 "loader directory (e.g. /lib/firmware)\n",
851 file);
852 goto err_free;
853 }
854
855 ret = moxa_load_fw(brd, fw);
856
857 release_firmware(fw);
858
859 if (ret)
860 goto err_free;
861
862 spin_lock_bh(&moxa_lock);
863 brd->ready = 1;
864 if (!timer_pending(&moxaTimer))
865 mod_timer(&moxaTimer, jiffies + HZ / 50);
866 spin_unlock_bh(&moxa_lock);
867
868 return 0;
869 err_free:
870 kfree(brd->ports);
871 err:
872 return ret;
873 }
874
875 static void moxa_board_deinit(struct moxa_board_conf *brd)
876 {
877 unsigned int a, opened;
878
879 mutex_lock(&moxa_openlock);
880 spin_lock_bh(&moxa_lock);
881 brd->ready = 0;
882 spin_unlock_bh(&moxa_lock);
883
884 /* pci hot-un-plug support */
885 for (a = 0; a < brd->numPorts; a++)
886 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
887 struct tty_struct *tty = tty_port_tty_get(
888 &brd->ports[a].port);
889 if (tty) {
890 tty_hangup(tty);
891 tty_kref_put(tty);
892 }
893 }
894 while (1) {
895 opened = 0;
896 for (a = 0; a < brd->numPorts; a++)
897 if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
898 opened++;
899 mutex_unlock(&moxa_openlock);
900 if (!opened)
901 break;
902 msleep(50);
903 mutex_lock(&moxa_openlock);
904 }
905
906 iounmap(brd->basemem);
907 brd->basemem = NULL;
908 kfree(brd->ports);
909 }
910
911 #ifdef CONFIG_PCI
912 static int __devinit moxa_pci_probe(struct pci_dev *pdev,
913 const struct pci_device_id *ent)
914 {
915 struct moxa_board_conf *board;
916 unsigned int i;
917 int board_type = ent->driver_data;
918 int retval;
919
920 retval = pci_enable_device(pdev);
921 if (retval) {
922 dev_err(&pdev->dev, "can't enable pci device\n");
923 goto err;
924 }
925
926 for (i = 0; i < MAX_BOARDS; i++)
927 if (moxa_boards[i].basemem == NULL)
928 break;
929
930 retval = -ENODEV;
931 if (i >= MAX_BOARDS) {
932 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
933 "found. Board is ignored.\n", MAX_BOARDS);
934 goto err;
935 }
936
937 board = &moxa_boards[i];
938
939 retval = pci_request_region(pdev, 2, "moxa-base");
940 if (retval) {
941 dev_err(&pdev->dev, "can't request pci region 2\n");
942 goto err;
943 }
944
945 board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
946 if (board->basemem == NULL) {
947 dev_err(&pdev->dev, "can't remap io space 2\n");
948 goto err_reg;
949 }
950
951 board->boardType = board_type;
952 switch (board_type) {
953 case MOXA_BOARD_C218_ISA:
954 case MOXA_BOARD_C218_PCI:
955 board->numPorts = 8;
956 break;
957
958 case MOXA_BOARD_CP204J:
959 board->numPorts = 4;
960 break;
961 default:
962 board->numPorts = 0;
963 break;
964 }
965 board->busType = MOXA_BUS_TYPE_PCI;
966
967 retval = moxa_init_board(board, &pdev->dev);
968 if (retval)
969 goto err_base;
970
971 pci_set_drvdata(pdev, board);
972
973 dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
974 moxa_brdname[board_type - 1], board->numPorts);
975
976 return 0;
977 err_base:
978 iounmap(board->basemem);
979 board->basemem = NULL;
980 err_reg:
981 pci_release_region(pdev, 2);
982 err:
983 return retval;
984 }
985
986 static void __devexit moxa_pci_remove(struct pci_dev *pdev)
987 {
988 struct moxa_board_conf *brd = pci_get_drvdata(pdev);
989
990 moxa_board_deinit(brd);
991
992 pci_release_region(pdev, 2);
993 }
994
995 static struct pci_driver moxa_pci_driver = {
996 .name = "moxa",
997 .id_table = moxa_pcibrds,
998 .probe = moxa_pci_probe,
999 .remove = __devexit_p(moxa_pci_remove)
1000 };
1001 #endif /* CONFIG_PCI */
1002
1003 static int __init moxa_init(void)
1004 {
1005 unsigned int isabrds = 0;
1006 int retval = 0;
1007
1008 printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1009 MOXA_VERSION);
1010 moxaDriver = alloc_tty_driver(MAX_PORTS + 1);
1011 if (!moxaDriver)
1012 return -ENOMEM;
1013
1014 moxaDriver->owner = THIS_MODULE;
1015 moxaDriver->name = "ttyMX";
1016 moxaDriver->major = ttymajor;
1017 moxaDriver->minor_start = 0;
1018 moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1019 moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1020 moxaDriver->init_termios = tty_std_termios;
1021 moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1022 moxaDriver->init_termios.c_ispeed = 9600;
1023 moxaDriver->init_termios.c_ospeed = 9600;
1024 moxaDriver->flags = TTY_DRIVER_REAL_RAW;
1025 tty_set_operations(moxaDriver, &moxa_ops);
1026
1027 if (tty_register_driver(moxaDriver)) {
1028 printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1029 put_tty_driver(moxaDriver);
1030 return -1;
1031 }
1032
1033 /* Find the boards defined from module args. */
1034 #ifdef MODULE
1035 {
1036 struct moxa_board_conf *brd = moxa_boards;
1037 unsigned int i;
1038 for (i = 0; i < MAX_BOARDS; i++) {
1039 if (!baseaddr[i])
1040 break;
1041 if (type[i] == MOXA_BOARD_C218_ISA ||
1042 type[i] == MOXA_BOARD_C320_ISA) {
1043 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1044 isabrds + 1, moxa_brdname[type[i] - 1],
1045 baseaddr[i]);
1046 brd->boardType = type[i];
1047 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1048 numports[i];
1049 brd->busType = MOXA_BUS_TYPE_ISA;
1050 brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1051 if (!brd->basemem) {
1052 printk(KERN_ERR "MOXA: can't remap %lx\n",
1053 baseaddr[i]);
1054 continue;
1055 }
1056 if (moxa_init_board(brd, NULL)) {
1057 iounmap(brd->basemem);
1058 brd->basemem = NULL;
1059 continue;
1060 }
1061
1062 printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1063 "ready (%u ports, firmware loaded)\n",
1064 baseaddr[i], brd->numPorts);
1065
1066 brd++;
1067 isabrds++;
1068 }
1069 }
1070 }
1071 #endif
1072
1073 #ifdef CONFIG_PCI
1074 retval = pci_register_driver(&moxa_pci_driver);
1075 if (retval) {
1076 printk(KERN_ERR "Can't register MOXA pci driver!\n");
1077 if (isabrds)
1078 retval = 0;
1079 }
1080 #endif
1081
1082 return retval;
1083 }
1084
1085 static void __exit moxa_exit(void)
1086 {
1087 unsigned int i;
1088
1089 #ifdef CONFIG_PCI
1090 pci_unregister_driver(&moxa_pci_driver);
1091 #endif
1092
1093 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1094 if (moxa_boards[i].ready)
1095 moxa_board_deinit(&moxa_boards[i]);
1096
1097 del_timer_sync(&moxaTimer);
1098
1099 if (tty_unregister_driver(moxaDriver))
1100 printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1101 "serial driver\n");
1102 put_tty_driver(moxaDriver);
1103 }
1104
1105 module_init(moxa_init);
1106 module_exit(moxa_exit);
1107
1108 static void moxa_close_port(struct tty_struct *tty)
1109 {
1110 struct moxa_port *ch = tty->driver_data;
1111 moxa_shut_down(tty);
1112 MoxaPortFlushData(ch, 2);
1113 ch->port.flags &= ~ASYNC_NORMAL_ACTIVE;
1114 tty->driver_data = NULL;
1115 tty_port_tty_set(&ch->port, NULL);
1116 }
1117
1118 static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
1119 struct moxa_port *ch)
1120 {
1121 DEFINE_WAIT(wait);
1122 int retval = 0;
1123 u8 dcd;
1124
1125 while (1) {
1126 prepare_to_wait(&ch->port.open_wait, &wait, TASK_INTERRUPTIBLE);
1127 if (tty_hung_up_p(filp)) {
1128 #ifdef SERIAL_DO_RESTART
1129 retval = -ERESTARTSYS;
1130 #else
1131 retval = -EAGAIN;
1132 #endif
1133 break;
1134 }
1135 spin_lock_bh(&moxa_lock);
1136 dcd = ch->DCDState;
1137 spin_unlock_bh(&moxa_lock);
1138 if (dcd)
1139 break;
1140
1141 if (signal_pending(current)) {
1142 retval = -ERESTARTSYS;
1143 break;
1144 }
1145 schedule();
1146 }
1147 finish_wait(&ch->port.open_wait, &wait);
1148
1149 return retval;
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 ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1172 ch->port.count++;
1173 tty->driver_data = ch;
1174 tty_port_tty_set(&ch->port, tty);
1175 if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1176 ch->statusflags = 0;
1177 moxa_set_tty_param(tty, tty->termios);
1178 MoxaPortLineCtrl(ch, 1, 1);
1179 MoxaPortEnable(ch);
1180 MoxaSetFifo(ch, ch->type == PORT_16550A);
1181 ch->port.flags |= ASYNC_INITIALIZED;
1182 }
1183 mutex_unlock(&moxa_openlock);
1184
1185 retval = 0;
1186 if (!(filp->f_flags & O_NONBLOCK) && !C_CLOCAL(tty))
1187 retval = moxa_block_till_ready(tty, filp, ch);
1188 mutex_lock(&moxa_openlock);
1189 if (retval) {
1190 if (ch->port.count) /* 0 means already hung up... */
1191 if (--ch->port.count == 0)
1192 moxa_close_port(tty);
1193 } else
1194 ch->port.flags |= ASYNC_NORMAL_ACTIVE;
1195 mutex_unlock(&moxa_openlock);
1196
1197 return retval;
1198 }
1199
1200 static void moxa_close(struct tty_struct *tty, struct file *filp)
1201 {
1202 struct moxa_port *ch;
1203 int port;
1204
1205 port = tty->index;
1206 if (port == MAX_PORTS || tty_hung_up_p(filp))
1207 return;
1208
1209 mutex_lock(&moxa_openlock);
1210 ch = tty->driver_data;
1211 if (ch == NULL)
1212 goto unlock;
1213 if (tty->count == 1 && ch->port.count != 1) {
1214 printk(KERN_WARNING "moxa_close: bad serial port count; "
1215 "tty->count is 1, ch->port.count is %d\n", ch->port.count);
1216 ch->port.count = 1;
1217 }
1218 if (--ch->port.count < 0) {
1219 printk(KERN_WARNING "moxa_close: bad serial port count, "
1220 "device=%s\n", tty->name);
1221 ch->port.count = 0;
1222 }
1223 if (ch->port.count)
1224 goto unlock;
1225
1226 ch->cflag = tty->termios->c_cflag;
1227 if (ch->port.flags & ASYNC_INITIALIZED) {
1228 moxa_setup_empty_event(tty);
1229 tty_wait_until_sent(tty, 30 * HZ); /* 30 seconds timeout */
1230 }
1231
1232 moxa_close_port(tty);
1233 unlock:
1234 mutex_unlock(&moxa_openlock);
1235 }
1236
1237 static int moxa_write(struct tty_struct *tty,
1238 const unsigned char *buf, int count)
1239 {
1240 struct moxa_port *ch = tty->driver_data;
1241 int len;
1242
1243 if (ch == NULL)
1244 return 0;
1245
1246 spin_lock_bh(&moxa_lock);
1247 len = MoxaPortWriteData(tty, buf, count);
1248 spin_unlock_bh(&moxa_lock);
1249
1250 ch->statusflags |= LOWWAIT;
1251 return len;
1252 }
1253
1254 static int moxa_write_room(struct tty_struct *tty)
1255 {
1256 struct moxa_port *ch;
1257
1258 if (tty->stopped)
1259 return 0;
1260 ch = tty->driver_data;
1261 if (ch == NULL)
1262 return 0;
1263 return MoxaPortTxFree(ch);
1264 }
1265
1266 static void moxa_flush_buffer(struct tty_struct *tty)
1267 {
1268 struct moxa_port *ch = tty->driver_data;
1269
1270 if (ch == NULL)
1271 return;
1272 MoxaPortFlushData(ch, 1);
1273 tty_wakeup(tty);
1274 }
1275
1276 static int moxa_chars_in_buffer(struct tty_struct *tty)
1277 {
1278 struct moxa_port *ch = tty->driver_data;
1279 int chars;
1280
1281 /*
1282 * Sigh...I have to check if driver_data is NULL here, because
1283 * if an open() fails, the TTY subsystem eventually calls
1284 * tty_wait_until_sent(), which calls the driver's chars_in_buffer()
1285 * routine. And since the open() failed, we return 0 here. TDJ
1286 */
1287 if (ch == NULL)
1288 return 0;
1289 lock_kernel();
1290 chars = MoxaPortTxQueue(ch);
1291 if (chars) {
1292 /*
1293 * Make it possible to wakeup anything waiting for output
1294 * in tty_ioctl.c, etc.
1295 */
1296 if (!(ch->statusflags & EMPTYWAIT))
1297 moxa_setup_empty_event(tty);
1298 }
1299 unlock_kernel();
1300 return chars;
1301 }
1302
1303 static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
1304 {
1305 struct moxa_port *ch;
1306 int flag = 0, dtr, rts;
1307
1308 mutex_lock(&moxa_openlock);
1309 ch = tty->driver_data;
1310 if (!ch) {
1311 mutex_unlock(&moxa_openlock);
1312 return -EINVAL;
1313 }
1314
1315 MoxaPortGetLineOut(ch, &dtr, &rts);
1316 if (dtr)
1317 flag |= TIOCM_DTR;
1318 if (rts)
1319 flag |= TIOCM_RTS;
1320 dtr = MoxaPortLineStatus(ch);
1321 if (dtr & 1)
1322 flag |= TIOCM_CTS;
1323 if (dtr & 2)
1324 flag |= TIOCM_DSR;
1325 if (dtr & 4)
1326 flag |= TIOCM_CD;
1327 mutex_unlock(&moxa_openlock);
1328 return flag;
1329 }
1330
1331 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
1332 unsigned int set, unsigned int clear)
1333 {
1334 struct moxa_port *ch;
1335 int port;
1336 int dtr, rts;
1337
1338 port = tty->index;
1339 mutex_lock(&moxa_openlock);
1340 ch = tty->driver_data;
1341 if (!ch) {
1342 mutex_unlock(&moxa_openlock);
1343 return -EINVAL;
1344 }
1345
1346 MoxaPortGetLineOut(ch, &dtr, &rts);
1347 if (set & TIOCM_RTS)
1348 rts = 1;
1349 if (set & TIOCM_DTR)
1350 dtr = 1;
1351 if (clear & TIOCM_RTS)
1352 rts = 0;
1353 if (clear & TIOCM_DTR)
1354 dtr = 0;
1355 MoxaPortLineCtrl(ch, dtr, rts);
1356 mutex_unlock(&moxa_openlock);
1357 return 0;
1358 }
1359
1360 static void moxa_throttle(struct tty_struct *tty)
1361 {
1362 struct moxa_port *ch = tty->driver_data;
1363
1364 ch->statusflags |= THROTTLE;
1365 }
1366
1367 static void moxa_unthrottle(struct tty_struct *tty)
1368 {
1369 struct moxa_port *ch = tty->driver_data;
1370
1371 ch->statusflags &= ~THROTTLE;
1372 }
1373
1374 static void moxa_set_termios(struct tty_struct *tty,
1375 struct ktermios *old_termios)
1376 {
1377 struct moxa_port *ch = tty->driver_data;
1378
1379 if (ch == NULL)
1380 return;
1381 moxa_set_tty_param(tty, old_termios);
1382 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1383 wake_up_interruptible(&ch->port.open_wait);
1384 }
1385
1386 static void moxa_stop(struct tty_struct *tty)
1387 {
1388 struct moxa_port *ch = tty->driver_data;
1389
1390 if (ch == NULL)
1391 return;
1392 MoxaPortTxDisable(ch);
1393 ch->statusflags |= TXSTOPPED;
1394 }
1395
1396
1397 static void moxa_start(struct tty_struct *tty)
1398 {
1399 struct moxa_port *ch = tty->driver_data;
1400
1401 if (ch == NULL)
1402 return;
1403
1404 if (!(ch->statusflags & TXSTOPPED))
1405 return;
1406
1407 MoxaPortTxEnable(ch);
1408 ch->statusflags &= ~TXSTOPPED;
1409 }
1410
1411 static void moxa_hangup(struct tty_struct *tty)
1412 {
1413 struct moxa_port *ch;
1414
1415 mutex_lock(&moxa_openlock);
1416 ch = tty->driver_data;
1417 if (ch == NULL) {
1418 mutex_unlock(&moxa_openlock);
1419 return;
1420 }
1421 ch->port.count = 0;
1422 moxa_close_port(tty);
1423 mutex_unlock(&moxa_openlock);
1424
1425 wake_up_interruptible(&ch->port.open_wait);
1426 }
1427
1428 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1429 {
1430 struct tty_struct *tty;
1431 dcd = !!dcd;
1432
1433 if (dcd != p->DCDState) {
1434 tty = tty_port_tty_get(&p->port);
1435 if (tty && C_CLOCAL(tty) && !dcd)
1436 tty_hangup(tty);
1437 tty_kref_put(tty);
1438 }
1439 p->DCDState = dcd;
1440 }
1441
1442 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1443 u16 __iomem *ip)
1444 {
1445 struct tty_struct *tty = tty_port_tty_get(&p->port);
1446 void __iomem *ofsAddr;
1447 unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1448 u16 intr;
1449
1450 if (tty) {
1451 if ((p->statusflags & EMPTYWAIT) &&
1452 MoxaPortTxQueue(p) == 0) {
1453 p->statusflags &= ~EMPTYWAIT;
1454 tty_wakeup(tty);
1455 }
1456 if ((p->statusflags & LOWWAIT) && !tty->stopped &&
1457 MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1458 p->statusflags &= ~LOWWAIT;
1459 tty_wakeup(tty);
1460 }
1461
1462 if (inited && !(p->statusflags & THROTTLE) &&
1463 MoxaPortRxQueue(p) > 0) { /* RX */
1464 MoxaPortReadData(p);
1465 tty_schedule_flip(tty);
1466 }
1467 } else {
1468 p->statusflags &= ~EMPTYWAIT;
1469 MoxaPortFlushData(p, 0); /* flush RX */
1470 }
1471
1472 if (!handle) /* nothing else to do */
1473 return 0;
1474
1475 intr = readw(ip); /* port irq status */
1476 if (intr == 0)
1477 return 0;
1478
1479 writew(0, ip); /* ACK port */
1480 ofsAddr = p->tableAddr;
1481 if (intr & IntrTx) /* disable tx intr */
1482 writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1483 ofsAddr + HostStat);
1484
1485 if (!inited)
1486 return 0;
1487
1488 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1489 tty_insert_flip_char(tty, 0, TTY_BREAK);
1490 tty_schedule_flip(tty);
1491 }
1492 tty_kref_put(tty);
1493
1494 if (intr & IntrLine)
1495 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1496
1497 return 0;
1498 }
1499
1500 static void moxa_poll(unsigned long ignored)
1501 {
1502 struct moxa_board_conf *brd;
1503 u16 __iomem *ip;
1504 unsigned int card, port, served = 0;
1505
1506 spin_lock(&moxa_lock);
1507 for (card = 0; card < MAX_BOARDS; card++) {
1508 brd = &moxa_boards[card];
1509 if (!brd->ready)
1510 continue;
1511
1512 served++;
1513
1514 ip = NULL;
1515 if (readb(brd->intPend) == 0xff)
1516 ip = brd->intTable + readb(brd->intNdx);
1517
1518 for (port = 0; port < brd->numPorts; port++)
1519 moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1520
1521 if (ip)
1522 writeb(0, brd->intPend); /* ACK */
1523
1524 if (moxaLowWaterChk) {
1525 struct moxa_port *p = brd->ports;
1526 for (port = 0; port < brd->numPorts; port++, p++)
1527 if (p->lowChkFlag) {
1528 p->lowChkFlag = 0;
1529 moxa_low_water_check(p->tableAddr);
1530 }
1531 }
1532 }
1533 moxaLowWaterChk = 0;
1534
1535 if (served)
1536 mod_timer(&moxaTimer, jiffies + HZ / 50);
1537 spin_unlock(&moxa_lock);
1538 }
1539
1540 /******************************************************************************/
1541
1542 static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1543 {
1544 register struct ktermios *ts = tty->termios;
1545 struct moxa_port *ch = tty->driver_data;
1546 int rts, cts, txflow, rxflow, xany, baud;
1547
1548 rts = cts = txflow = rxflow = xany = 0;
1549 if (ts->c_cflag & CRTSCTS)
1550 rts = cts = 1;
1551 if (ts->c_iflag & IXON)
1552 txflow = 1;
1553 if (ts->c_iflag & IXOFF)
1554 rxflow = 1;
1555 if (ts->c_iflag & IXANY)
1556 xany = 1;
1557
1558 /* Clear the features we don't support */
1559 ts->c_cflag &= ~CMSPAR;
1560 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1561 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1562 if (baud == -1)
1563 baud = tty_termios_baud_rate(old_termios);
1564 /* Not put the baud rate into the termios data */
1565 tty_encode_baud_rate(tty, baud, baud);
1566 }
1567
1568 static void moxa_setup_empty_event(struct tty_struct *tty)
1569 {
1570 struct moxa_port *ch = tty->driver_data;
1571
1572 spin_lock_bh(&moxa_lock);
1573 ch->statusflags |= EMPTYWAIT;
1574 spin_unlock_bh(&moxa_lock);
1575 }
1576
1577 static void moxa_shut_down(struct tty_struct *tty)
1578 {
1579 struct moxa_port *ch = tty->driver_data;
1580
1581 if (!(ch->port.flags & ASYNC_INITIALIZED))
1582 return;
1583
1584 MoxaPortDisable(ch);
1585
1586 /*
1587 * If we're a modem control device and HUPCL is on, drop RTS & DTR.
1588 */
1589 if (C_HUPCL(tty))
1590 MoxaPortLineCtrl(ch, 0, 0);
1591
1592 spin_lock_bh(&moxa_lock);
1593 ch->port.flags &= ~ASYNC_INITIALIZED;
1594 spin_unlock_bh(&moxa_lock);
1595 }
1596
1597 /*****************************************************************************
1598 * Driver level functions: *
1599 *****************************************************************************/
1600
1601 static void MoxaPortFlushData(struct moxa_port *port, int mode)
1602 {
1603 void __iomem *ofsAddr;
1604 if (mode < 0 || mode > 2)
1605 return;
1606 ofsAddr = port->tableAddr;
1607 moxafunc(ofsAddr, FC_FlushQueue, mode);
1608 if (mode != 1) {
1609 port->lowChkFlag = 0;
1610 moxa_low_water_check(ofsAddr);
1611 }
1612 }
1613
1614 /*
1615 * Moxa Port Number Description:
1616 *
1617 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1618 * the port number using in MOXA driver functions will be 0 to 31 for
1619 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1620 * to 127 for fourth. For example, if you setup three MOXA boards,
1621 * first board is C218, second board is C320-16 and third board is
1622 * C320-32. The port number of first board (C218 - 8 ports) is from
1623 * 0 to 7. The port number of second board (C320 - 16 ports) is form
1624 * 32 to 47. The port number of third board (C320 - 32 ports) is from
1625 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1626 * 127 will be invalid.
1627 *
1628 *
1629 * Moxa Functions Description:
1630 *
1631 * Function 1: Driver initialization routine, this routine must be
1632 * called when initialized driver.
1633 * Syntax:
1634 * void MoxaDriverInit();
1635 *
1636 *
1637 * Function 2: Moxa driver private IOCTL command processing.
1638 * Syntax:
1639 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1640 *
1641 * unsigned int cmd : IOCTL command
1642 * unsigned long arg : IOCTL argument
1643 * int port : port number (0 - 127)
1644 *
1645 * return: 0 (OK)
1646 * -EINVAL
1647 * -ENOIOCTLCMD
1648 *
1649 *
1650 * Function 6: Enable this port to start Tx/Rx data.
1651 * Syntax:
1652 * void MoxaPortEnable(int port);
1653 * int port : port number (0 - 127)
1654 *
1655 *
1656 * Function 7: Disable this port
1657 * Syntax:
1658 * void MoxaPortDisable(int port);
1659 * int port : port number (0 - 127)
1660 *
1661 *
1662 * Function 10: Setting baud rate of this port.
1663 * Syntax:
1664 * speed_t MoxaPortSetBaud(int port, speed_t baud);
1665 * int port : port number (0 - 127)
1666 * long baud : baud rate (50 - 115200)
1667 *
1668 * return: 0 : this port is invalid or baud < 50
1669 * 50 - 115200 : the real baud rate set to the port, if
1670 * the argument baud is large than maximun
1671 * available baud rate, the real setting
1672 * baud rate will be the maximun baud rate.
1673 *
1674 *
1675 * Function 12: Configure the port.
1676 * Syntax:
1677 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1678 * int port : port number (0 - 127)
1679 * struct ktermios * termio : termio structure pointer
1680 * speed_t baud : baud rate
1681 *
1682 * return: -1 : this port is invalid or termio == NULL
1683 * 0 : setting O.K.
1684 *
1685 *
1686 * Function 13: Get the DTR/RTS state of this port.
1687 * Syntax:
1688 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1689 * int port : port number (0 - 127)
1690 * int * dtrState : pointer to INT to receive the current DTR
1691 * state. (if NULL, this function will not
1692 * write to this address)
1693 * int * rtsState : pointer to INT to receive the current RTS
1694 * state. (if NULL, this function will not
1695 * write to this address)
1696 *
1697 * return: -1 : this port is invalid
1698 * 0 : O.K.
1699 *
1700 *
1701 * Function 14: Setting the DTR/RTS output state of this port.
1702 * Syntax:
1703 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1704 * int port : port number (0 - 127)
1705 * int dtrState : DTR output state (0: off, 1: on)
1706 * int rtsState : RTS output state (0: off, 1: on)
1707 *
1708 *
1709 * Function 15: Setting the flow control of this port.
1710 * Syntax:
1711 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1712 * int txFlow,int xany);
1713 * int port : port number (0 - 127)
1714 * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1715 * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1716 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1717 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1718 * int xany : S/W XANY flow control (0: no, 1: yes)
1719 *
1720 *
1721 * Function 16: Get ths line status of this port
1722 * Syntax:
1723 * int MoxaPortLineStatus(int port);
1724 * int port : port number (0 - 127)
1725 *
1726 * return: Bit 0 - CTS state (0: off, 1: on)
1727 * Bit 1 - DSR state (0: off, 1: on)
1728 * Bit 2 - DCD state (0: off, 1: on)
1729 *
1730 *
1731 * Function 19: Flush the Rx/Tx buffer data of this port.
1732 * Syntax:
1733 * void MoxaPortFlushData(int port, int mode);
1734 * int port : port number (0 - 127)
1735 * int mode
1736 * 0 : flush the Rx buffer
1737 * 1 : flush the Tx buffer
1738 * 2 : flush the Rx and Tx buffer
1739 *
1740 *
1741 * Function 20: Write data.
1742 * Syntax:
1743 * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1744 * int port : port number (0 - 127)
1745 * unsigned char * buffer : pointer to write data buffer.
1746 * int length : write data length
1747 *
1748 * return: 0 - length : real write data length
1749 *
1750 *
1751 * Function 21: Read data.
1752 * Syntax:
1753 * int MoxaPortReadData(int port, struct tty_struct *tty);
1754 * int port : port number (0 - 127)
1755 * struct tty_struct *tty : tty for data
1756 *
1757 * return: 0 - length : real read data length
1758 *
1759 *
1760 * Function 24: Get the Tx buffer current queued data bytes
1761 * Syntax:
1762 * int MoxaPortTxQueue(int port);
1763 * int port : port number (0 - 127)
1764 *
1765 * return: .. : Tx buffer current queued data bytes
1766 *
1767 *
1768 * Function 25: Get the Tx buffer current free space
1769 * Syntax:
1770 * int MoxaPortTxFree(int port);
1771 * int port : port number (0 - 127)
1772 *
1773 * return: .. : Tx buffer current free space
1774 *
1775 *
1776 * Function 26: Get the Rx buffer current queued data bytes
1777 * Syntax:
1778 * int MoxaPortRxQueue(int port);
1779 * int port : port number (0 - 127)
1780 *
1781 * return: .. : Rx buffer current queued data bytes
1782 *
1783 *
1784 * Function 28: Disable port data transmission.
1785 * Syntax:
1786 * void MoxaPortTxDisable(int port);
1787 * int port : port number (0 - 127)
1788 *
1789 *
1790 * Function 29: Enable port data transmission.
1791 * Syntax:
1792 * void MoxaPortTxEnable(int port);
1793 * int port : port number (0 - 127)
1794 *
1795 *
1796 * Function 31: Get the received BREAK signal count and reset it.
1797 * Syntax:
1798 * int MoxaPortResetBrkCnt(int port);
1799 * int port : port number (0 - 127)
1800 *
1801 * return: 0 - .. : BREAK signal count
1802 *
1803 *
1804 */
1805
1806 static void MoxaPortEnable(struct moxa_port *port)
1807 {
1808 void __iomem *ofsAddr;
1809 u16 lowwater = 512;
1810
1811 ofsAddr = port->tableAddr;
1812 writew(lowwater, ofsAddr + Low_water);
1813 if (MOXA_IS_320(port->board))
1814 moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1815 else
1816 writew(readw(ofsAddr + HostStat) | WakeupBreak,
1817 ofsAddr + HostStat);
1818
1819 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1820 moxafunc(ofsAddr, FC_FlushQueue, 2);
1821
1822 moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1823 MoxaPortLineStatus(port);
1824 }
1825
1826 static void MoxaPortDisable(struct moxa_port *port)
1827 {
1828 void __iomem *ofsAddr = port->tableAddr;
1829
1830 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1831 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1832 writew(0, ofsAddr + HostStat);
1833 moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1834 }
1835
1836 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1837 {
1838 void __iomem *ofsAddr = port->tableAddr;
1839 unsigned int clock, val;
1840 speed_t max;
1841
1842 max = MOXA_IS_320(port->board) ? 460800 : 921600;
1843 if (baud < 50)
1844 return 0;
1845 if (baud > max)
1846 baud = max;
1847 clock = 921600;
1848 val = clock / baud;
1849 moxafunc(ofsAddr, FC_SetBaud, val);
1850 baud = clock / val;
1851 return baud;
1852 }
1853
1854 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1855 speed_t baud)
1856 {
1857 void __iomem *ofsAddr;
1858 tcflag_t cflag;
1859 tcflag_t mode = 0;
1860
1861 ofsAddr = port->tableAddr;
1862 cflag = termio->c_cflag; /* termio->c_cflag */
1863
1864 mode = termio->c_cflag & CSIZE;
1865 if (mode == CS5)
1866 mode = MX_CS5;
1867 else if (mode == CS6)
1868 mode = MX_CS6;
1869 else if (mode == CS7)
1870 mode = MX_CS7;
1871 else if (mode == CS8)
1872 mode = MX_CS8;
1873
1874 if (termio->c_cflag & CSTOPB) {
1875 if (mode == MX_CS5)
1876 mode |= MX_STOP15;
1877 else
1878 mode |= MX_STOP2;
1879 } else
1880 mode |= MX_STOP1;
1881
1882 if (termio->c_cflag & PARENB) {
1883 if (termio->c_cflag & PARODD)
1884 mode |= MX_PARODD;
1885 else
1886 mode |= MX_PAREVEN;
1887 } else
1888 mode |= MX_PARNONE;
1889
1890 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1891
1892 if (MOXA_IS_320(port->board) && baud >= 921600)
1893 return -1;
1894
1895 baud = MoxaPortSetBaud(port, baud);
1896
1897 if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1898 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1899 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1900 writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1901 moxa_wait_finish(ofsAddr);
1902
1903 }
1904 return baud;
1905 }
1906
1907 static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1908 int *rtsState)
1909 {
1910 if (dtrState)
1911 *dtrState = !!(port->lineCtrl & DTR_ON);
1912 if (rtsState)
1913 *rtsState = !!(port->lineCtrl & RTS_ON);
1914
1915 return 0;
1916 }
1917
1918 static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1919 {
1920 u8 mode = 0;
1921
1922 if (dtr)
1923 mode |= DTR_ON;
1924 if (rts)
1925 mode |= RTS_ON;
1926 port->lineCtrl = mode;
1927 moxafunc(port->tableAddr, FC_LineControl, mode);
1928 }
1929
1930 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1931 int txflow, int rxflow, int txany)
1932 {
1933 int mode = 0;
1934
1935 if (rts)
1936 mode |= RTS_FlowCtl;
1937 if (cts)
1938 mode |= CTS_FlowCtl;
1939 if (txflow)
1940 mode |= Tx_FlowCtl;
1941 if (rxflow)
1942 mode |= Rx_FlowCtl;
1943 if (txany)
1944 mode |= IXM_IXANY;
1945 moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1946 }
1947
1948 static int MoxaPortLineStatus(struct moxa_port *port)
1949 {
1950 void __iomem *ofsAddr;
1951 int val;
1952
1953 ofsAddr = port->tableAddr;
1954 if (MOXA_IS_320(port->board)) {
1955 moxafunc(ofsAddr, FC_LineStatus, 0);
1956 val = readw(ofsAddr + FuncArg);
1957 } else {
1958 val = readw(ofsAddr + FlagStat) >> 4;
1959 }
1960 val &= 0x0B;
1961 if (val & 8)
1962 val |= 4;
1963 spin_lock_bh(&moxa_lock);
1964 moxa_new_dcdstate(port, val & 8);
1965 spin_unlock_bh(&moxa_lock);
1966 val &= 7;
1967 return val;
1968 }
1969
1970 static int MoxaPortWriteData(struct tty_struct *tty,
1971 const unsigned char *buffer, int len)
1972 {
1973 struct moxa_port *port = tty->driver_data;
1974 void __iomem *baseAddr, *ofsAddr, *ofs;
1975 unsigned int c, total;
1976 u16 head, tail, tx_mask, spage, epage;
1977 u16 pageno, pageofs, bufhead;
1978
1979 ofsAddr = port->tableAddr;
1980 baseAddr = port->board->basemem;
1981 tx_mask = readw(ofsAddr + TX_mask);
1982 spage = readw(ofsAddr + Page_txb);
1983 epage = readw(ofsAddr + EndPage_txb);
1984 tail = readw(ofsAddr + TXwptr);
1985 head = readw(ofsAddr + TXrptr);
1986 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1987 if (c > len)
1988 c = len;
1989 moxaLog.txcnt[port->port.tty->index] += c;
1990 total = c;
1991 if (spage == epage) {
1992 bufhead = readw(ofsAddr + Ofs_txb);
1993 writew(spage, baseAddr + Control_reg);
1994 while (c > 0) {
1995 if (head > tail)
1996 len = head - tail - 1;
1997 else
1998 len = tx_mask + 1 - tail;
1999 len = (c > len) ? len : c;
2000 ofs = baseAddr + DynPage_addr + bufhead + tail;
2001 memcpy_toio(ofs, buffer, len);
2002 buffer += len;
2003 tail = (tail + len) & tx_mask;
2004 c -= len;
2005 }
2006 } else {
2007 pageno = spage + (tail >> 13);
2008 pageofs = tail & Page_mask;
2009 while (c > 0) {
2010 len = Page_size - pageofs;
2011 if (len > c)
2012 len = c;
2013 writeb(pageno, baseAddr + Control_reg);
2014 ofs = baseAddr + DynPage_addr + pageofs;
2015 memcpy_toio(ofs, buffer, len);
2016 buffer += len;
2017 if (++pageno == epage)
2018 pageno = spage;
2019 pageofs = 0;
2020 c -= len;
2021 }
2022 tail = (tail + total) & tx_mask;
2023 }
2024 writew(tail, ofsAddr + TXwptr);
2025 writeb(1, ofsAddr + CD180TXirq); /* start to send */
2026 return total;
2027 }
2028
2029 static int MoxaPortReadData(struct moxa_port *port)
2030 {
2031 struct tty_struct *tty = port->port.tty;
2032 unsigned char *dst;
2033 void __iomem *baseAddr, *ofsAddr, *ofs;
2034 unsigned int count, len, total;
2035 u16 tail, rx_mask, spage, epage;
2036 u16 pageno, pageofs, bufhead, head;
2037
2038 ofsAddr = port->tableAddr;
2039 baseAddr = port->board->basemem;
2040 head = readw(ofsAddr + RXrptr);
2041 tail = readw(ofsAddr + RXwptr);
2042 rx_mask = readw(ofsAddr + RX_mask);
2043 spage = readw(ofsAddr + Page_rxb);
2044 epage = readw(ofsAddr + EndPage_rxb);
2045 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
2046 if (count == 0)
2047 return 0;
2048
2049 total = count;
2050 moxaLog.rxcnt[tty->index] += total;
2051 if (spage == epage) {
2052 bufhead = readw(ofsAddr + Ofs_rxb);
2053 writew(spage, baseAddr + Control_reg);
2054 while (count > 0) {
2055 ofs = baseAddr + DynPage_addr + bufhead + head;
2056 len = (tail >= head) ? (tail - head) :
2057 (rx_mask + 1 - head);
2058 len = tty_prepare_flip_string(tty, &dst,
2059 min(len, count));
2060 memcpy_fromio(dst, ofs, len);
2061 head = (head + len) & rx_mask;
2062 count -= len;
2063 }
2064 } else {
2065 pageno = spage + (head >> 13);
2066 pageofs = head & Page_mask;
2067 while (count > 0) {
2068 writew(pageno, baseAddr + Control_reg);
2069 ofs = baseAddr + DynPage_addr + pageofs;
2070 len = tty_prepare_flip_string(tty, &dst,
2071 min(Page_size - pageofs, count));
2072 memcpy_fromio(dst, ofs, len);
2073
2074 count -= len;
2075 pageofs = (pageofs + len) & Page_mask;
2076 if (pageofs == 0 && ++pageno == epage)
2077 pageno = spage;
2078 }
2079 head = (head + total) & rx_mask;
2080 }
2081 writew(head, ofsAddr + RXrptr);
2082 if (readb(ofsAddr + FlagStat) & Xoff_state) {
2083 moxaLowWaterChk = 1;
2084 port->lowChkFlag = 1;
2085 }
2086 return total;
2087 }
2088
2089
2090 static int MoxaPortTxQueue(struct moxa_port *port)
2091 {
2092 void __iomem *ofsAddr = port->tableAddr;
2093 u16 rptr, wptr, mask;
2094
2095 rptr = readw(ofsAddr + TXrptr);
2096 wptr = readw(ofsAddr + TXwptr);
2097 mask = readw(ofsAddr + TX_mask);
2098 return (wptr - rptr) & mask;
2099 }
2100
2101 static int MoxaPortTxFree(struct moxa_port *port)
2102 {
2103 void __iomem *ofsAddr = port->tableAddr;
2104 u16 rptr, wptr, mask;
2105
2106 rptr = readw(ofsAddr + TXrptr);
2107 wptr = readw(ofsAddr + TXwptr);
2108 mask = readw(ofsAddr + TX_mask);
2109 return mask - ((wptr - rptr) & mask);
2110 }
2111
2112 static int MoxaPortRxQueue(struct moxa_port *port)
2113 {
2114 void __iomem *ofsAddr = port->tableAddr;
2115 u16 rptr, wptr, mask;
2116
2117 rptr = readw(ofsAddr + RXrptr);
2118 wptr = readw(ofsAddr + RXwptr);
2119 mask = readw(ofsAddr + RX_mask);
2120 return (wptr - rptr) & mask;
2121 }
2122
2123 static void MoxaPortTxDisable(struct moxa_port *port)
2124 {
2125 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2126 }
2127
2128 static void MoxaPortTxEnable(struct moxa_port *port)
2129 {
2130 moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2131 }
2132
2133 static int moxa_get_serial_info(struct moxa_port *info,
2134 struct serial_struct __user *retinfo)
2135 {
2136 struct serial_struct tmp = {
2137 .type = info->type,
2138 .line = info->port.tty->index,
2139 .flags = info->port.flags,
2140 .baud_base = 921600,
2141 .close_delay = info->port.close_delay
2142 };
2143 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2144 }
2145
2146
2147 static int moxa_set_serial_info(struct moxa_port *info,
2148 struct serial_struct __user *new_info)
2149 {
2150 struct serial_struct new_serial;
2151
2152 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2153 return -EFAULT;
2154
2155 if (new_serial.irq != 0 || new_serial.port != 0 ||
2156 new_serial.custom_divisor != 0 ||
2157 new_serial.baud_base != 921600)
2158 return -EPERM;
2159
2160 if (!capable(CAP_SYS_ADMIN)) {
2161 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2162 (info->port.flags & ~ASYNC_USR_MASK)))
2163 return -EPERM;
2164 } else
2165 info->port.close_delay = new_serial.close_delay * HZ / 100;
2166
2167 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2168 new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2169
2170 MoxaSetFifo(info, new_serial.type == PORT_16550A);
2171
2172 info->type = new_serial.type;
2173 return 0;
2174 }
2175
2176
2177
2178 /*****************************************************************************
2179 * Static local functions: *
2180 *****************************************************************************/
2181
2182 static void MoxaSetFifo(struct moxa_port *port, int enable)
2183 {
2184 void __iomem *ofsAddr = port->tableAddr;
2185
2186 if (!enable) {
2187 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2188 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2189 } else {
2190 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2191 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2192 }
2193 }
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