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tty/serial: lay the foundations for the next set of reworks
[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 moxa_board_conf *board;
134 struct tty_struct *tty;
135 void __iomem *tableAddr;
136
137 int type;
138 int close_delay;
139 unsigned int count;
140 int asyncflags;
141 int cflag;
142 unsigned long statusflags;
143 wait_queue_head_t open_wait;
144
145 u8 DCDState;
146 u8 lineCtrl;
147 u8 lowChkFlag;
148 };
149
150 struct mon_str {
151 int tick;
152 int rxcnt[MAX_PORTS];
153 int txcnt[MAX_PORTS];
154 };
155
156 /* statusflags */
157 #define TXSTOPPED 0x1
158 #define LOWWAIT 0x2
159 #define EMPTYWAIT 0x4
160 #define THROTTLE 0x8
161
162 #define SERIAL_DO_RESTART
163
164 #define WAKEUP_CHARS 256
165
166 static int ttymajor = MOXAMAJOR;
167 static struct mon_str moxaLog;
168 static unsigned int moxaFuncTout = HZ / 2;
169 static unsigned int moxaLowWaterChk;
170 static DEFINE_MUTEX(moxa_openlock);
171 /* Variables for insmod */
172 #ifdef MODULE
173 static unsigned long baseaddr[MAX_BOARDS];
174 static unsigned int type[MAX_BOARDS];
175 static unsigned int numports[MAX_BOARDS];
176 #endif
177
178 MODULE_AUTHOR("William Chen");
179 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
180 MODULE_LICENSE("GPL");
181 #ifdef MODULE
182 module_param_array(type, uint, NULL, 0);
183 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
184 module_param_array(baseaddr, ulong, NULL, 0);
185 MODULE_PARM_DESC(baseaddr, "base address");
186 module_param_array(numports, uint, NULL, 0);
187 MODULE_PARM_DESC(numports, "numports (ignored for C218)");
188 #endif
189 module_param(ttymajor, int, 0);
190
191 /*
192 * static functions:
193 */
194 static int moxa_open(struct tty_struct *, struct file *);
195 static void moxa_close(struct tty_struct *, struct file *);
196 static int moxa_write(struct tty_struct *, const unsigned char *, int);
197 static int moxa_write_room(struct tty_struct *);
198 static void moxa_flush_buffer(struct tty_struct *);
199 static int moxa_chars_in_buffer(struct tty_struct *);
200 static void moxa_throttle(struct tty_struct *);
201 static void moxa_unthrottle(struct tty_struct *);
202 static void moxa_set_termios(struct tty_struct *, struct ktermios *);
203 static void moxa_stop(struct tty_struct *);
204 static void moxa_start(struct tty_struct *);
205 static void moxa_hangup(struct tty_struct *);
206 static int moxa_tiocmget(struct tty_struct *tty, struct file *file);
207 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
208 unsigned int set, unsigned int clear);
209 static void moxa_poll(unsigned long);
210 static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
211 static void moxa_setup_empty_event(struct tty_struct *);
212 static void moxa_shut_down(struct moxa_port *);
213 /*
214 * moxa board interface functions:
215 */
216 static void MoxaPortEnable(struct moxa_port *);
217 static void MoxaPortDisable(struct moxa_port *);
218 static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
219 static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
220 static void MoxaPortLineCtrl(struct moxa_port *, int, int);
221 static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
222 static int MoxaPortLineStatus(struct moxa_port *);
223 static void MoxaPortFlushData(struct moxa_port *, int);
224 static int MoxaPortWriteData(struct moxa_port *, const unsigned char *, int);
225 static int MoxaPortReadData(struct moxa_port *);
226 static int MoxaPortTxQueue(struct moxa_port *);
227 static int MoxaPortRxQueue(struct moxa_port *);
228 static int MoxaPortTxFree(struct moxa_port *);
229 static void MoxaPortTxDisable(struct moxa_port *);
230 static void MoxaPortTxEnable(struct moxa_port *);
231 static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
232 static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
233 static void MoxaSetFifo(struct moxa_port *port, int enable);
234
235 /*
236 * I/O functions
237 */
238
239 static void moxa_wait_finish(void __iomem *ofsAddr)
240 {
241 unsigned long end = jiffies + moxaFuncTout;
242
243 while (readw(ofsAddr + FuncCode) != 0)
244 if (time_after(jiffies, end))
245 return;
246 if (readw(ofsAddr + FuncCode) != 0 && printk_ratelimit())
247 printk(KERN_WARNING "moxa function expired\n");
248 }
249
250 static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
251 {
252 writew(arg, ofsAddr + FuncArg);
253 writew(cmd, ofsAddr + FuncCode);
254 moxa_wait_finish(ofsAddr);
255 }
256
257 static void moxa_low_water_check(void __iomem *ofsAddr)
258 {
259 u16 rptr, wptr, mask, len;
260
261 if (readb(ofsAddr + FlagStat) & Xoff_state) {
262 rptr = readw(ofsAddr + RXrptr);
263 wptr = readw(ofsAddr + RXwptr);
264 mask = readw(ofsAddr + RX_mask);
265 len = (wptr - rptr) & mask;
266 if (len <= Low_water)
267 moxafunc(ofsAddr, FC_SendXon, 0);
268 }
269 }
270
271 /*
272 * TTY operations
273 */
274
275 static int moxa_ioctl(struct tty_struct *tty, struct file *file,
276 unsigned int cmd, unsigned long arg)
277 {
278 struct moxa_port *ch = tty->driver_data;
279 void __user *argp = (void __user *)arg;
280 int status, ret = 0;
281
282 if (tty->index == MAX_PORTS) {
283 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
284 cmd != MOXA_GETMSTATUS)
285 return -EINVAL;
286 } else if (!ch)
287 return -ENODEV;
288
289 switch (cmd) {
290 case MOXA_GETDATACOUNT:
291 moxaLog.tick = jiffies;
292 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
293 ret = -EFAULT;
294 break;
295 case MOXA_FLUSH_QUEUE:
296 MoxaPortFlushData(ch, arg);
297 break;
298 case MOXA_GET_IOQUEUE: {
299 struct moxaq_str __user *argm = argp;
300 struct moxaq_str tmp;
301 struct moxa_port *p;
302 unsigned int i, j;
303
304 mutex_lock(&moxa_openlock);
305 for (i = 0; i < MAX_BOARDS; i++) {
306 p = moxa_boards[i].ports;
307 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
308 memset(&tmp, 0, sizeof(tmp));
309 if (moxa_boards[i].ready) {
310 tmp.inq = MoxaPortRxQueue(p);
311 tmp.outq = MoxaPortTxQueue(p);
312 }
313 if (copy_to_user(argm, &tmp, sizeof(tmp))) {
314 mutex_unlock(&moxa_openlock);
315 return -EFAULT;
316 }
317 }
318 }
319 mutex_unlock(&moxa_openlock);
320 break;
321 } case MOXA_GET_OQUEUE:
322 status = MoxaPortTxQueue(ch);
323 ret = put_user(status, (unsigned long __user *)argp);
324 break;
325 case MOXA_GET_IQUEUE:
326 status = MoxaPortRxQueue(ch);
327 ret = put_user(status, (unsigned long __user *)argp);
328 break;
329 case MOXA_GETMSTATUS: {
330 struct mxser_mstatus __user *argm = argp;
331 struct mxser_mstatus tmp;
332 struct moxa_port *p;
333 unsigned int i, j;
334
335 mutex_lock(&moxa_openlock);
336 for (i = 0; i < MAX_BOARDS; i++) {
337 p = moxa_boards[i].ports;
338 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
339 memset(&tmp, 0, sizeof(tmp));
340 if (!moxa_boards[i].ready)
341 goto copy;
342
343 status = MoxaPortLineStatus(p);
344 if (status & 1)
345 tmp.cts = 1;
346 if (status & 2)
347 tmp.dsr = 1;
348 if (status & 4)
349 tmp.dcd = 1;
350
351 if (!p->tty || !p->tty->termios)
352 tmp.cflag = p->cflag;
353 else
354 tmp.cflag = p->tty->termios->c_cflag;
355 copy:
356 if (copy_to_user(argm, &tmp, sizeof(tmp))) {
357 mutex_unlock(&moxa_openlock);
358 return -EFAULT;
359 }
360 }
361 }
362 mutex_unlock(&moxa_openlock);
363 break;
364 }
365 case TIOCGSERIAL:
366 mutex_lock(&moxa_openlock);
367 ret = moxa_get_serial_info(ch, argp);
368 mutex_unlock(&moxa_openlock);
369 break;
370 case TIOCSSERIAL:
371 mutex_lock(&moxa_openlock);
372 ret = moxa_set_serial_info(ch, argp);
373 mutex_unlock(&moxa_openlock);
374 break;
375 default:
376 ret = -ENOIOCTLCMD;
377 }
378 return ret;
379 }
380
381 static void moxa_break_ctl(struct tty_struct *tty, int state)
382 {
383 struct moxa_port *port = tty->driver_data;
384
385 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
386 Magic_code);
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 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 } *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 p->type = PORT_16550A;
829 p->close_delay = 5 * HZ / 10;
830 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
831 init_waitqueue_head(&p->open_wait);
832 }
833
834 switch (brd->boardType) {
835 case MOXA_BOARD_C218_ISA:
836 case MOXA_BOARD_C218_PCI:
837 file = "c218tunx.cod";
838 break;
839 case MOXA_BOARD_CP204J:
840 file = "cp204unx.cod";
841 break;
842 default:
843 file = "c320tunx.cod";
844 break;
845 }
846
847 ret = request_firmware(&fw, file, dev);
848 if (ret) {
849 printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
850 "you've placed '%s' file into your firmware "
851 "loader directory (e.g. /lib/firmware)\n",
852 file);
853 goto err_free;
854 }
855
856 ret = moxa_load_fw(brd, fw);
857
858 release_firmware(fw);
859
860 if (ret)
861 goto err_free;
862
863 spin_lock_bh(&moxa_lock);
864 brd->ready = 1;
865 if (!timer_pending(&moxaTimer))
866 mod_timer(&moxaTimer, jiffies + HZ / 50);
867 spin_unlock_bh(&moxa_lock);
868
869 return 0;
870 err_free:
871 kfree(brd->ports);
872 err:
873 return ret;
874 }
875
876 static void moxa_board_deinit(struct moxa_board_conf *brd)
877 {
878 unsigned int a, opened;
879
880 mutex_lock(&moxa_openlock);
881 spin_lock_bh(&moxa_lock);
882 brd->ready = 0;
883 spin_unlock_bh(&moxa_lock);
884
885 /* pci hot-un-plug support */
886 for (a = 0; a < brd->numPorts; a++)
887 if (brd->ports[a].asyncflags & ASYNC_INITIALIZED)
888 tty_hangup(brd->ports[a].tty);
889 while (1) {
890 opened = 0;
891 for (a = 0; a < brd->numPorts; a++)
892 if (brd->ports[a].asyncflags & ASYNC_INITIALIZED)
893 opened++;
894 mutex_unlock(&moxa_openlock);
895 if (!opened)
896 break;
897 msleep(50);
898 mutex_lock(&moxa_openlock);
899 }
900
901 iounmap(brd->basemem);
902 brd->basemem = NULL;
903 kfree(brd->ports);
904 }
905
906 #ifdef CONFIG_PCI
907 static int __devinit moxa_pci_probe(struct pci_dev *pdev,
908 const struct pci_device_id *ent)
909 {
910 struct moxa_board_conf *board;
911 unsigned int i;
912 int board_type = ent->driver_data;
913 int retval;
914
915 retval = pci_enable_device(pdev);
916 if (retval) {
917 dev_err(&pdev->dev, "can't enable pci device\n");
918 goto err;
919 }
920
921 for (i = 0; i < MAX_BOARDS; i++)
922 if (moxa_boards[i].basemem == NULL)
923 break;
924
925 retval = -ENODEV;
926 if (i >= MAX_BOARDS) {
927 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
928 "found. Board is ignored.\n", MAX_BOARDS);
929 goto err;
930 }
931
932 board = &moxa_boards[i];
933
934 retval = pci_request_region(pdev, 2, "moxa-base");
935 if (retval) {
936 dev_err(&pdev->dev, "can't request pci region 2\n");
937 goto err;
938 }
939
940 board->basemem = ioremap(pci_resource_start(pdev, 2), 0x4000);
941 if (board->basemem == NULL) {
942 dev_err(&pdev->dev, "can't remap io space 2\n");
943 goto err_reg;
944 }
945
946 board->boardType = board_type;
947 switch (board_type) {
948 case MOXA_BOARD_C218_ISA:
949 case MOXA_BOARD_C218_PCI:
950 board->numPorts = 8;
951 break;
952
953 case MOXA_BOARD_CP204J:
954 board->numPorts = 4;
955 break;
956 default:
957 board->numPorts = 0;
958 break;
959 }
960 board->busType = MOXA_BUS_TYPE_PCI;
961
962 retval = moxa_init_board(board, &pdev->dev);
963 if (retval)
964 goto err_base;
965
966 pci_set_drvdata(pdev, board);
967
968 dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
969 moxa_brdname[board_type - 1], board->numPorts);
970
971 return 0;
972 err_base:
973 iounmap(board->basemem);
974 board->basemem = NULL;
975 err_reg:
976 pci_release_region(pdev, 2);
977 err:
978 return retval;
979 }
980
981 static void __devexit moxa_pci_remove(struct pci_dev *pdev)
982 {
983 struct moxa_board_conf *brd = pci_get_drvdata(pdev);
984
985 moxa_board_deinit(brd);
986
987 pci_release_region(pdev, 2);
988 }
989
990 static struct pci_driver moxa_pci_driver = {
991 .name = "moxa",
992 .id_table = moxa_pcibrds,
993 .probe = moxa_pci_probe,
994 .remove = __devexit_p(moxa_pci_remove)
995 };
996 #endif /* CONFIG_PCI */
997
998 static int __init moxa_init(void)
999 {
1000 unsigned int isabrds = 0;
1001 int retval = 0;
1002
1003 printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1004 MOXA_VERSION);
1005 moxaDriver = alloc_tty_driver(MAX_PORTS + 1);
1006 if (!moxaDriver)
1007 return -ENOMEM;
1008
1009 moxaDriver->owner = THIS_MODULE;
1010 moxaDriver->name = "ttyMX";
1011 moxaDriver->major = ttymajor;
1012 moxaDriver->minor_start = 0;
1013 moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1014 moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1015 moxaDriver->init_termios = tty_std_termios;
1016 moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1017 moxaDriver->init_termios.c_ispeed = 9600;
1018 moxaDriver->init_termios.c_ospeed = 9600;
1019 moxaDriver->flags = TTY_DRIVER_REAL_RAW;
1020 tty_set_operations(moxaDriver, &moxa_ops);
1021
1022 if (tty_register_driver(moxaDriver)) {
1023 printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1024 put_tty_driver(moxaDriver);
1025 return -1;
1026 }
1027
1028 /* Find the boards defined from module args. */
1029 #ifdef MODULE
1030 {
1031 struct moxa_board_conf *brd = moxa_boards;
1032 unsigned int i;
1033 for (i = 0; i < MAX_BOARDS; i++) {
1034 if (!baseaddr[i])
1035 break;
1036 if (type[i] == MOXA_BOARD_C218_ISA ||
1037 type[i] == MOXA_BOARD_C320_ISA) {
1038 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1039 isabrds + 1, moxa_brdname[type[i] - 1],
1040 baseaddr[i]);
1041 brd->boardType = type[i];
1042 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1043 numports[i];
1044 brd->busType = MOXA_BUS_TYPE_ISA;
1045 brd->basemem = ioremap(baseaddr[i], 0x4000);
1046 if (!brd->basemem) {
1047 printk(KERN_ERR "MOXA: can't remap %lx\n",
1048 baseaddr[i]);
1049 continue;
1050 }
1051 if (moxa_init_board(brd, NULL)) {
1052 iounmap(brd->basemem);
1053 brd->basemem = NULL;
1054 continue;
1055 }
1056
1057 printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1058 "ready (%u ports, firmware loaded)\n",
1059 baseaddr[i], brd->numPorts);
1060
1061 brd++;
1062 isabrds++;
1063 }
1064 }
1065 }
1066 #endif
1067
1068 #ifdef CONFIG_PCI
1069 retval = pci_register_driver(&moxa_pci_driver);
1070 if (retval) {
1071 printk(KERN_ERR "Can't register MOXA pci driver!\n");
1072 if (isabrds)
1073 retval = 0;
1074 }
1075 #endif
1076
1077 return retval;
1078 }
1079
1080 static void __exit moxa_exit(void)
1081 {
1082 unsigned int i;
1083
1084 #ifdef CONFIG_PCI
1085 pci_unregister_driver(&moxa_pci_driver);
1086 #endif
1087
1088 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1089 if (moxa_boards[i].ready)
1090 moxa_board_deinit(&moxa_boards[i]);
1091
1092 del_timer_sync(&moxaTimer);
1093
1094 if (tty_unregister_driver(moxaDriver))
1095 printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1096 "serial driver\n");
1097 put_tty_driver(moxaDriver);
1098 }
1099
1100 module_init(moxa_init);
1101 module_exit(moxa_exit);
1102
1103 static void moxa_close_port(struct moxa_port *ch)
1104 {
1105 moxa_shut_down(ch);
1106 MoxaPortFlushData(ch, 2);
1107 ch->asyncflags &= ~ASYNC_NORMAL_ACTIVE;
1108 ch->tty->driver_data = NULL;
1109 ch->tty = NULL;
1110 }
1111
1112 static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
1113 struct moxa_port *ch)
1114 {
1115 DEFINE_WAIT(wait);
1116 int retval = 0;
1117 u8 dcd;
1118
1119 while (1) {
1120 prepare_to_wait(&ch->open_wait, &wait, TASK_INTERRUPTIBLE);
1121 if (tty_hung_up_p(filp)) {
1122 #ifdef SERIAL_DO_RESTART
1123 retval = -ERESTARTSYS;
1124 #else
1125 retval = -EAGAIN;
1126 #endif
1127 break;
1128 }
1129 spin_lock_bh(&moxa_lock);
1130 dcd = ch->DCDState;
1131 spin_unlock_bh(&moxa_lock);
1132 if (dcd)
1133 break;
1134
1135 if (signal_pending(current)) {
1136 retval = -ERESTARTSYS;
1137 break;
1138 }
1139 schedule();
1140 }
1141 finish_wait(&ch->open_wait, &wait);
1142
1143 return retval;
1144 }
1145
1146 static int moxa_open(struct tty_struct *tty, struct file *filp)
1147 {
1148 struct moxa_board_conf *brd;
1149 struct moxa_port *ch;
1150 int port;
1151 int retval;
1152
1153 port = tty->index;
1154 if (port == MAX_PORTS) {
1155 return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1156 }
1157 if (mutex_lock_interruptible(&moxa_openlock))
1158 return -ERESTARTSYS;
1159 brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1160 if (!brd->ready) {
1161 mutex_unlock(&moxa_openlock);
1162 return -ENODEV;
1163 }
1164
1165 ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1166 ch->count++;
1167 tty->driver_data = ch;
1168 ch->tty = tty;
1169 if (!(ch->asyncflags & ASYNC_INITIALIZED)) {
1170 ch->statusflags = 0;
1171 moxa_set_tty_param(tty, tty->termios);
1172 MoxaPortLineCtrl(ch, 1, 1);
1173 MoxaPortEnable(ch);
1174 MoxaSetFifo(ch, ch->type == PORT_16550A);
1175 ch->asyncflags |= ASYNC_INITIALIZED;
1176 }
1177 mutex_unlock(&moxa_openlock);
1178
1179 retval = 0;
1180 if (!(filp->f_flags & O_NONBLOCK) && !C_CLOCAL(tty))
1181 retval = moxa_block_till_ready(tty, filp, ch);
1182 mutex_lock(&moxa_openlock);
1183 if (retval) {
1184 if (ch->count) /* 0 means already hung up... */
1185 if (--ch->count == 0)
1186 moxa_close_port(ch);
1187 } else
1188 ch->asyncflags |= ASYNC_NORMAL_ACTIVE;
1189 mutex_unlock(&moxa_openlock);
1190
1191 return retval;
1192 }
1193
1194 static void moxa_close(struct tty_struct *tty, struct file *filp)
1195 {
1196 struct moxa_port *ch;
1197 int port;
1198
1199 port = tty->index;
1200 if (port == MAX_PORTS || tty_hung_up_p(filp))
1201 return;
1202
1203 mutex_lock(&moxa_openlock);
1204 ch = tty->driver_data;
1205 if (ch == NULL)
1206 goto unlock;
1207 if (tty->count == 1 && ch->count != 1) {
1208 printk(KERN_WARNING "moxa_close: bad serial port count; "
1209 "tty->count is 1, ch->count is %d\n", ch->count);
1210 ch->count = 1;
1211 }
1212 if (--ch->count < 0) {
1213 printk(KERN_WARNING "moxa_close: bad serial port count, "
1214 "device=%s\n", tty->name);
1215 ch->count = 0;
1216 }
1217 if (ch->count)
1218 goto unlock;
1219
1220 ch->cflag = tty->termios->c_cflag;
1221 if (ch->asyncflags & ASYNC_INITIALIZED) {
1222 moxa_setup_empty_event(tty);
1223 tty_wait_until_sent(tty, 30 * HZ); /* 30 seconds timeout */
1224 }
1225
1226 moxa_close_port(ch);
1227 unlock:
1228 mutex_unlock(&moxa_openlock);
1229 }
1230
1231 static int moxa_write(struct tty_struct *tty,
1232 const unsigned char *buf, int count)
1233 {
1234 struct moxa_port *ch = tty->driver_data;
1235 int len;
1236
1237 if (ch == NULL)
1238 return 0;
1239
1240 spin_lock_bh(&moxa_lock);
1241 len = MoxaPortWriteData(ch, buf, count);
1242 spin_unlock_bh(&moxa_lock);
1243
1244 ch->statusflags |= LOWWAIT;
1245 return len;
1246 }
1247
1248 static int moxa_write_room(struct tty_struct *tty)
1249 {
1250 struct moxa_port *ch;
1251
1252 if (tty->stopped)
1253 return 0;
1254 ch = tty->driver_data;
1255 if (ch == NULL)
1256 return 0;
1257 return MoxaPortTxFree(ch);
1258 }
1259
1260 static void moxa_flush_buffer(struct tty_struct *tty)
1261 {
1262 struct moxa_port *ch = tty->driver_data;
1263
1264 if (ch == NULL)
1265 return;
1266 MoxaPortFlushData(ch, 1);
1267 tty_wakeup(tty);
1268 }
1269
1270 static int moxa_chars_in_buffer(struct tty_struct *tty)
1271 {
1272 struct moxa_port *ch = tty->driver_data;
1273 int chars;
1274
1275 /*
1276 * Sigh...I have to check if driver_data is NULL here, because
1277 * if an open() fails, the TTY subsystem eventually calls
1278 * tty_wait_until_sent(), which calls the driver's chars_in_buffer()
1279 * routine. And since the open() failed, we return 0 here. TDJ
1280 */
1281 if (ch == NULL)
1282 return 0;
1283 lock_kernel();
1284 chars = MoxaPortTxQueue(ch);
1285 if (chars) {
1286 /*
1287 * Make it possible to wakeup anything waiting for output
1288 * in tty_ioctl.c, etc.
1289 */
1290 if (!(ch->statusflags & EMPTYWAIT))
1291 moxa_setup_empty_event(tty);
1292 }
1293 unlock_kernel();
1294 return chars;
1295 }
1296
1297 static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
1298 {
1299 struct moxa_port *ch;
1300 int flag = 0, dtr, rts;
1301
1302 mutex_lock(&moxa_openlock);
1303 ch = tty->driver_data;
1304 if (!ch) {
1305 mutex_unlock(&moxa_openlock);
1306 return -EINVAL;
1307 }
1308
1309 MoxaPortGetLineOut(ch, &dtr, &rts);
1310 if (dtr)
1311 flag |= TIOCM_DTR;
1312 if (rts)
1313 flag |= TIOCM_RTS;
1314 dtr = MoxaPortLineStatus(ch);
1315 if (dtr & 1)
1316 flag |= TIOCM_CTS;
1317 if (dtr & 2)
1318 flag |= TIOCM_DSR;
1319 if (dtr & 4)
1320 flag |= TIOCM_CD;
1321 mutex_unlock(&moxa_openlock);
1322 return flag;
1323 }
1324
1325 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
1326 unsigned int set, unsigned int clear)
1327 {
1328 struct moxa_port *ch;
1329 int port;
1330 int dtr, rts;
1331
1332 port = tty->index;
1333 mutex_lock(&moxa_openlock);
1334 ch = tty->driver_data;
1335 if (!ch) {
1336 mutex_unlock(&moxa_openlock);
1337 return -EINVAL;
1338 }
1339
1340 MoxaPortGetLineOut(ch, &dtr, &rts);
1341 if (set & TIOCM_RTS)
1342 rts = 1;
1343 if (set & TIOCM_DTR)
1344 dtr = 1;
1345 if (clear & TIOCM_RTS)
1346 rts = 0;
1347 if (clear & TIOCM_DTR)
1348 dtr = 0;
1349 MoxaPortLineCtrl(ch, dtr, rts);
1350 mutex_unlock(&moxa_openlock);
1351 return 0;
1352 }
1353
1354 static void moxa_throttle(struct tty_struct *tty)
1355 {
1356 struct moxa_port *ch = tty->driver_data;
1357
1358 ch->statusflags |= THROTTLE;
1359 }
1360
1361 static void moxa_unthrottle(struct tty_struct *tty)
1362 {
1363 struct moxa_port *ch = tty->driver_data;
1364
1365 ch->statusflags &= ~THROTTLE;
1366 }
1367
1368 static void moxa_set_termios(struct tty_struct *tty,
1369 struct ktermios *old_termios)
1370 {
1371 struct moxa_port *ch = tty->driver_data;
1372
1373 if (ch == NULL)
1374 return;
1375 moxa_set_tty_param(tty, old_termios);
1376 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1377 wake_up_interruptible(&ch->open_wait);
1378 }
1379
1380 static void moxa_stop(struct tty_struct *tty)
1381 {
1382 struct moxa_port *ch = tty->driver_data;
1383
1384 if (ch == NULL)
1385 return;
1386 MoxaPortTxDisable(ch);
1387 ch->statusflags |= TXSTOPPED;
1388 }
1389
1390
1391 static void moxa_start(struct tty_struct *tty)
1392 {
1393 struct moxa_port *ch = tty->driver_data;
1394
1395 if (ch == NULL)
1396 return;
1397
1398 if (!(ch->statusflags & TXSTOPPED))
1399 return;
1400
1401 MoxaPortTxEnable(ch);
1402 ch->statusflags &= ~TXSTOPPED;
1403 }
1404
1405 static void moxa_hangup(struct tty_struct *tty)
1406 {
1407 struct moxa_port *ch;
1408
1409 mutex_lock(&moxa_openlock);
1410 ch = tty->driver_data;
1411 if (ch == NULL) {
1412 mutex_unlock(&moxa_openlock);
1413 return;
1414 }
1415 ch->count = 0;
1416 moxa_close_port(ch);
1417 mutex_unlock(&moxa_openlock);
1418
1419 wake_up_interruptible(&ch->open_wait);
1420 }
1421
1422 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1423 {
1424 dcd = !!dcd;
1425
1426 if (dcd != p->DCDState && p->tty && C_CLOCAL(p->tty)) {
1427 if (!dcd)
1428 tty_hangup(p->tty);
1429 }
1430 p->DCDState = dcd;
1431 }
1432
1433 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1434 u16 __iomem *ip)
1435 {
1436 struct tty_struct *tty = p->tty;
1437 void __iomem *ofsAddr;
1438 unsigned int inited = p->asyncflags & ASYNC_INITIALIZED;
1439 u16 intr;
1440
1441 if (tty) {
1442 if ((p->statusflags & EMPTYWAIT) &&
1443 MoxaPortTxQueue(p) == 0) {
1444 p->statusflags &= ~EMPTYWAIT;
1445 tty_wakeup(tty);
1446 }
1447 if ((p->statusflags & LOWWAIT) && !tty->stopped &&
1448 MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1449 p->statusflags &= ~LOWWAIT;
1450 tty_wakeup(tty);
1451 }
1452
1453 if (inited && !(p->statusflags & THROTTLE) &&
1454 MoxaPortRxQueue(p) > 0) { /* RX */
1455 MoxaPortReadData(p);
1456 tty_schedule_flip(tty);
1457 }
1458 } else {
1459 p->statusflags &= ~EMPTYWAIT;
1460 MoxaPortFlushData(p, 0); /* flush RX */
1461 }
1462
1463 if (!handle) /* nothing else to do */
1464 return 0;
1465
1466 intr = readw(ip); /* port irq status */
1467 if (intr == 0)
1468 return 0;
1469
1470 writew(0, ip); /* ACK port */
1471 ofsAddr = p->tableAddr;
1472 if (intr & IntrTx) /* disable tx intr */
1473 writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1474 ofsAddr + HostStat);
1475
1476 if (!inited)
1477 return 0;
1478
1479 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1480 tty_insert_flip_char(tty, 0, TTY_BREAK);
1481 tty_schedule_flip(tty);
1482 }
1483
1484 if (intr & IntrLine)
1485 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1486
1487 return 0;
1488 }
1489
1490 static void moxa_poll(unsigned long ignored)
1491 {
1492 struct moxa_board_conf *brd;
1493 u16 __iomem *ip;
1494 unsigned int card, port, served = 0;
1495
1496 spin_lock(&moxa_lock);
1497 for (card = 0; card < MAX_BOARDS; card++) {
1498 brd = &moxa_boards[card];
1499 if (!brd->ready)
1500 continue;
1501
1502 served++;
1503
1504 ip = NULL;
1505 if (readb(brd->intPend) == 0xff)
1506 ip = brd->intTable + readb(brd->intNdx);
1507
1508 for (port = 0; port < brd->numPorts; port++)
1509 moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1510
1511 if (ip)
1512 writeb(0, brd->intPend); /* ACK */
1513
1514 if (moxaLowWaterChk) {
1515 struct moxa_port *p = brd->ports;
1516 for (port = 0; port < brd->numPorts; port++, p++)
1517 if (p->lowChkFlag) {
1518 p->lowChkFlag = 0;
1519 moxa_low_water_check(p->tableAddr);
1520 }
1521 }
1522 }
1523 moxaLowWaterChk = 0;
1524
1525 if (served)
1526 mod_timer(&moxaTimer, jiffies + HZ / 50);
1527 spin_unlock(&moxa_lock);
1528 }
1529
1530 /******************************************************************************/
1531
1532 static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1533 {
1534 register struct ktermios *ts = tty->termios;
1535 struct moxa_port *ch = tty->driver_data;
1536 int rts, cts, txflow, rxflow, xany, baud;
1537
1538 rts = cts = txflow = rxflow = xany = 0;
1539 if (ts->c_cflag & CRTSCTS)
1540 rts = cts = 1;
1541 if (ts->c_iflag & IXON)
1542 txflow = 1;
1543 if (ts->c_iflag & IXOFF)
1544 rxflow = 1;
1545 if (ts->c_iflag & IXANY)
1546 xany = 1;
1547
1548 /* Clear the features we don't support */
1549 ts->c_cflag &= ~CMSPAR;
1550 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1551 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1552 if (baud == -1)
1553 baud = tty_termios_baud_rate(old_termios);
1554 /* Not put the baud rate into the termios data */
1555 tty_encode_baud_rate(tty, baud, baud);
1556 }
1557
1558 static void moxa_setup_empty_event(struct tty_struct *tty)
1559 {
1560 struct moxa_port *ch = tty->driver_data;
1561
1562 spin_lock_bh(&moxa_lock);
1563 ch->statusflags |= EMPTYWAIT;
1564 spin_unlock_bh(&moxa_lock);
1565 }
1566
1567 static void moxa_shut_down(struct moxa_port *ch)
1568 {
1569 struct tty_struct *tp = ch->tty;
1570
1571 if (!(ch->asyncflags & ASYNC_INITIALIZED))
1572 return;
1573
1574 MoxaPortDisable(ch);
1575
1576 /*
1577 * If we're a modem control device and HUPCL is on, drop RTS & DTR.
1578 */
1579 if (C_HUPCL(tp))
1580 MoxaPortLineCtrl(ch, 0, 0);
1581
1582 spin_lock_bh(&moxa_lock);
1583 ch->asyncflags &= ~ASYNC_INITIALIZED;
1584 spin_unlock_bh(&moxa_lock);
1585 }
1586
1587 /*****************************************************************************
1588 * Driver level functions: *
1589 *****************************************************************************/
1590
1591 static void MoxaPortFlushData(struct moxa_port *port, int mode)
1592 {
1593 void __iomem *ofsAddr;
1594 if (mode < 0 || mode > 2)
1595 return;
1596 ofsAddr = port->tableAddr;
1597 moxafunc(ofsAddr, FC_FlushQueue, mode);
1598 if (mode != 1) {
1599 port->lowChkFlag = 0;
1600 moxa_low_water_check(ofsAddr);
1601 }
1602 }
1603
1604 /*
1605 * Moxa Port Number Description:
1606 *
1607 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1608 * the port number using in MOXA driver functions will be 0 to 31 for
1609 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1610 * to 127 for fourth. For example, if you setup three MOXA boards,
1611 * first board is C218, second board is C320-16 and third board is
1612 * C320-32. The port number of first board (C218 - 8 ports) is from
1613 * 0 to 7. The port number of second board (C320 - 16 ports) is form
1614 * 32 to 47. The port number of third board (C320 - 32 ports) is from
1615 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1616 * 127 will be invalid.
1617 *
1618 *
1619 * Moxa Functions Description:
1620 *
1621 * Function 1: Driver initialization routine, this routine must be
1622 * called when initialized driver.
1623 * Syntax:
1624 * void MoxaDriverInit();
1625 *
1626 *
1627 * Function 2: Moxa driver private IOCTL command processing.
1628 * Syntax:
1629 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1630 *
1631 * unsigned int cmd : IOCTL command
1632 * unsigned long arg : IOCTL argument
1633 * int port : port number (0 - 127)
1634 *
1635 * return: 0 (OK)
1636 * -EINVAL
1637 * -ENOIOCTLCMD
1638 *
1639 *
1640 * Function 6: Enable this port to start Tx/Rx data.
1641 * Syntax:
1642 * void MoxaPortEnable(int port);
1643 * int port : port number (0 - 127)
1644 *
1645 *
1646 * Function 7: Disable this port
1647 * Syntax:
1648 * void MoxaPortDisable(int port);
1649 * int port : port number (0 - 127)
1650 *
1651 *
1652 * Function 10: Setting baud rate of this port.
1653 * Syntax:
1654 * speed_t MoxaPortSetBaud(int port, speed_t baud);
1655 * int port : port number (0 - 127)
1656 * long baud : baud rate (50 - 115200)
1657 *
1658 * return: 0 : this port is invalid or baud < 50
1659 * 50 - 115200 : the real baud rate set to the port, if
1660 * the argument baud is large than maximun
1661 * available baud rate, the real setting
1662 * baud rate will be the maximun baud rate.
1663 *
1664 *
1665 * Function 12: Configure the port.
1666 * Syntax:
1667 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1668 * int port : port number (0 - 127)
1669 * struct ktermios * termio : termio structure pointer
1670 * speed_t baud : baud rate
1671 *
1672 * return: -1 : this port is invalid or termio == NULL
1673 * 0 : setting O.K.
1674 *
1675 *
1676 * Function 13: Get the DTR/RTS state of this port.
1677 * Syntax:
1678 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1679 * int port : port number (0 - 127)
1680 * int * dtrState : pointer to INT to receive the current DTR
1681 * state. (if NULL, this function will not
1682 * write to this address)
1683 * int * rtsState : pointer to INT to receive the current RTS
1684 * state. (if NULL, this function will not
1685 * write to this address)
1686 *
1687 * return: -1 : this port is invalid
1688 * 0 : O.K.
1689 *
1690 *
1691 * Function 14: Setting the DTR/RTS output state of this port.
1692 * Syntax:
1693 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1694 * int port : port number (0 - 127)
1695 * int dtrState : DTR output state (0: off, 1: on)
1696 * int rtsState : RTS output state (0: off, 1: on)
1697 *
1698 *
1699 * Function 15: Setting the flow control of this port.
1700 * Syntax:
1701 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1702 * int txFlow,int xany);
1703 * int port : port number (0 - 127)
1704 * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1705 * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1706 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1707 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1708 * int xany : S/W XANY flow control (0: no, 1: yes)
1709 *
1710 *
1711 * Function 16: Get ths line status of this port
1712 * Syntax:
1713 * int MoxaPortLineStatus(int port);
1714 * int port : port number (0 - 127)
1715 *
1716 * return: Bit 0 - CTS state (0: off, 1: on)
1717 * Bit 1 - DSR state (0: off, 1: on)
1718 * Bit 2 - DCD state (0: off, 1: on)
1719 *
1720 *
1721 * Function 19: Flush the Rx/Tx buffer data of this port.
1722 * Syntax:
1723 * void MoxaPortFlushData(int port, int mode);
1724 * int port : port number (0 - 127)
1725 * int mode
1726 * 0 : flush the Rx buffer
1727 * 1 : flush the Tx buffer
1728 * 2 : flush the Rx and Tx buffer
1729 *
1730 *
1731 * Function 20: Write data.
1732 * Syntax:
1733 * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1734 * int port : port number (0 - 127)
1735 * unsigned char * buffer : pointer to write data buffer.
1736 * int length : write data length
1737 *
1738 * return: 0 - length : real write data length
1739 *
1740 *
1741 * Function 21: Read data.
1742 * Syntax:
1743 * int MoxaPortReadData(int port, struct tty_struct *tty);
1744 * int port : port number (0 - 127)
1745 * struct tty_struct *tty : tty for data
1746 *
1747 * return: 0 - length : real read data length
1748 *
1749 *
1750 * Function 24: Get the Tx buffer current queued data bytes
1751 * Syntax:
1752 * int MoxaPortTxQueue(int port);
1753 * int port : port number (0 - 127)
1754 *
1755 * return: .. : Tx buffer current queued data bytes
1756 *
1757 *
1758 * Function 25: Get the Tx buffer current free space
1759 * Syntax:
1760 * int MoxaPortTxFree(int port);
1761 * int port : port number (0 - 127)
1762 *
1763 * return: .. : Tx buffer current free space
1764 *
1765 *
1766 * Function 26: Get the Rx buffer current queued data bytes
1767 * Syntax:
1768 * int MoxaPortRxQueue(int port);
1769 * int port : port number (0 - 127)
1770 *
1771 * return: .. : Rx buffer current queued data bytes
1772 *
1773 *
1774 * Function 28: Disable port data transmission.
1775 * Syntax:
1776 * void MoxaPortTxDisable(int port);
1777 * int port : port number (0 - 127)
1778 *
1779 *
1780 * Function 29: Enable port data transmission.
1781 * Syntax:
1782 * void MoxaPortTxEnable(int port);
1783 * int port : port number (0 - 127)
1784 *
1785 *
1786 * Function 31: Get the received BREAK signal count and reset it.
1787 * Syntax:
1788 * int MoxaPortResetBrkCnt(int port);
1789 * int port : port number (0 - 127)
1790 *
1791 * return: 0 - .. : BREAK signal count
1792 *
1793 *
1794 */
1795
1796 static void MoxaPortEnable(struct moxa_port *port)
1797 {
1798 void __iomem *ofsAddr;
1799 u16 lowwater = 512;
1800
1801 ofsAddr = port->tableAddr;
1802 writew(lowwater, ofsAddr + Low_water);
1803 if (MOXA_IS_320(port->board))
1804 moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1805 else
1806 writew(readw(ofsAddr + HostStat) | WakeupBreak,
1807 ofsAddr + HostStat);
1808
1809 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1810 moxafunc(ofsAddr, FC_FlushQueue, 2);
1811
1812 moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1813 MoxaPortLineStatus(port);
1814 }
1815
1816 static void MoxaPortDisable(struct moxa_port *port)
1817 {
1818 void __iomem *ofsAddr = port->tableAddr;
1819
1820 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1821 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1822 writew(0, ofsAddr + HostStat);
1823 moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1824 }
1825
1826 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1827 {
1828 void __iomem *ofsAddr = port->tableAddr;
1829 unsigned int clock, val;
1830 speed_t max;
1831
1832 max = MOXA_IS_320(port->board) ? 460800 : 921600;
1833 if (baud < 50)
1834 return 0;
1835 if (baud > max)
1836 baud = max;
1837 clock = 921600;
1838 val = clock / baud;
1839 moxafunc(ofsAddr, FC_SetBaud, val);
1840 baud = clock / val;
1841 return baud;
1842 }
1843
1844 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1845 speed_t baud)
1846 {
1847 void __iomem *ofsAddr;
1848 tcflag_t cflag;
1849 tcflag_t mode = 0;
1850
1851 ofsAddr = port->tableAddr;
1852 cflag = termio->c_cflag; /* termio->c_cflag */
1853
1854 mode = termio->c_cflag & CSIZE;
1855 if (mode == CS5)
1856 mode = MX_CS5;
1857 else if (mode == CS6)
1858 mode = MX_CS6;
1859 else if (mode == CS7)
1860 mode = MX_CS7;
1861 else if (mode == CS8)
1862 mode = MX_CS8;
1863
1864 if (termio->c_cflag & CSTOPB) {
1865 if (mode == MX_CS5)
1866 mode |= MX_STOP15;
1867 else
1868 mode |= MX_STOP2;
1869 } else
1870 mode |= MX_STOP1;
1871
1872 if (termio->c_cflag & PARENB) {
1873 if (termio->c_cflag & PARODD)
1874 mode |= MX_PARODD;
1875 else
1876 mode |= MX_PAREVEN;
1877 } else
1878 mode |= MX_PARNONE;
1879
1880 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1881
1882 if (MOXA_IS_320(port->board) && baud >= 921600)
1883 return -1;
1884
1885 baud = MoxaPortSetBaud(port, baud);
1886
1887 if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1888 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1889 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1890 writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1891 moxa_wait_finish(ofsAddr);
1892
1893 }
1894 return baud;
1895 }
1896
1897 static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1898 int *rtsState)
1899 {
1900 if (dtrState)
1901 *dtrState = !!(port->lineCtrl & DTR_ON);
1902 if (rtsState)
1903 *rtsState = !!(port->lineCtrl & RTS_ON);
1904
1905 return 0;
1906 }
1907
1908 static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1909 {
1910 u8 mode = 0;
1911
1912 if (dtr)
1913 mode |= DTR_ON;
1914 if (rts)
1915 mode |= RTS_ON;
1916 port->lineCtrl = mode;
1917 moxafunc(port->tableAddr, FC_LineControl, mode);
1918 }
1919
1920 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1921 int txflow, int rxflow, int txany)
1922 {
1923 int mode = 0;
1924
1925 if (rts)
1926 mode |= RTS_FlowCtl;
1927 if (cts)
1928 mode |= CTS_FlowCtl;
1929 if (txflow)
1930 mode |= Tx_FlowCtl;
1931 if (rxflow)
1932 mode |= Rx_FlowCtl;
1933 if (txany)
1934 mode |= IXM_IXANY;
1935 moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1936 }
1937
1938 static int MoxaPortLineStatus(struct moxa_port *port)
1939 {
1940 void __iomem *ofsAddr;
1941 int val;
1942
1943 ofsAddr = port->tableAddr;
1944 if (MOXA_IS_320(port->board)) {
1945 moxafunc(ofsAddr, FC_LineStatus, 0);
1946 val = readw(ofsAddr + FuncArg);
1947 } else {
1948 val = readw(ofsAddr + FlagStat) >> 4;
1949 }
1950 val &= 0x0B;
1951 if (val & 8)
1952 val |= 4;
1953 spin_lock_bh(&moxa_lock);
1954 moxa_new_dcdstate(port, val & 8);
1955 spin_unlock_bh(&moxa_lock);
1956 val &= 7;
1957 return val;
1958 }
1959
1960 static int MoxaPortWriteData(struct moxa_port *port,
1961 const unsigned char *buffer, int len)
1962 {
1963 void __iomem *baseAddr, *ofsAddr, *ofs;
1964 unsigned int c, total;
1965 u16 head, tail, tx_mask, spage, epage;
1966 u16 pageno, pageofs, bufhead;
1967
1968 ofsAddr = port->tableAddr;
1969 baseAddr = port->board->basemem;
1970 tx_mask = readw(ofsAddr + TX_mask);
1971 spage = readw(ofsAddr + Page_txb);
1972 epage = readw(ofsAddr + EndPage_txb);
1973 tail = readw(ofsAddr + TXwptr);
1974 head = readw(ofsAddr + TXrptr);
1975 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1976 if (c > len)
1977 c = len;
1978 moxaLog.txcnt[port->tty->index] += c;
1979 total = c;
1980 if (spage == epage) {
1981 bufhead = readw(ofsAddr + Ofs_txb);
1982 writew(spage, baseAddr + Control_reg);
1983 while (c > 0) {
1984 if (head > tail)
1985 len = head - tail - 1;
1986 else
1987 len = tx_mask + 1 - tail;
1988 len = (c > len) ? len : c;
1989 ofs = baseAddr + DynPage_addr + bufhead + tail;
1990 memcpy_toio(ofs, buffer, len);
1991 buffer += len;
1992 tail = (tail + len) & tx_mask;
1993 c -= len;
1994 }
1995 } else {
1996 pageno = spage + (tail >> 13);
1997 pageofs = tail & Page_mask;
1998 while (c > 0) {
1999 len = Page_size - pageofs;
2000 if (len > c)
2001 len = c;
2002 writeb(pageno, baseAddr + Control_reg);
2003 ofs = baseAddr + DynPage_addr + pageofs;
2004 memcpy_toio(ofs, buffer, len);
2005 buffer += len;
2006 if (++pageno == epage)
2007 pageno = spage;
2008 pageofs = 0;
2009 c -= len;
2010 }
2011 tail = (tail + total) & tx_mask;
2012 }
2013 writew(tail, ofsAddr + TXwptr);
2014 writeb(1, ofsAddr + CD180TXirq); /* start to send */
2015 return total;
2016 }
2017
2018 static int MoxaPortReadData(struct moxa_port *port)
2019 {
2020 struct tty_struct *tty = port->tty;
2021 unsigned char *dst;
2022 void __iomem *baseAddr, *ofsAddr, *ofs;
2023 unsigned int count, len, total;
2024 u16 tail, rx_mask, spage, epage;
2025 u16 pageno, pageofs, bufhead, head;
2026
2027 ofsAddr = port->tableAddr;
2028 baseAddr = port->board->basemem;
2029 head = readw(ofsAddr + RXrptr);
2030 tail = readw(ofsAddr + RXwptr);
2031 rx_mask = readw(ofsAddr + RX_mask);
2032 spage = readw(ofsAddr + Page_rxb);
2033 epage = readw(ofsAddr + EndPage_rxb);
2034 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
2035 if (count == 0)
2036 return 0;
2037
2038 total = count;
2039 moxaLog.rxcnt[tty->index] += total;
2040 if (spage == epage) {
2041 bufhead = readw(ofsAddr + Ofs_rxb);
2042 writew(spage, baseAddr + Control_reg);
2043 while (count > 0) {
2044 ofs = baseAddr + DynPage_addr + bufhead + head;
2045 len = (tail >= head) ? (tail - head) :
2046 (rx_mask + 1 - head);
2047 len = tty_prepare_flip_string(tty, &dst,
2048 min(len, count));
2049 memcpy_fromio(dst, ofs, len);
2050 head = (head + len) & rx_mask;
2051 count -= len;
2052 }
2053 } else {
2054 pageno = spage + (head >> 13);
2055 pageofs = head & Page_mask;
2056 while (count > 0) {
2057 writew(pageno, baseAddr + Control_reg);
2058 ofs = baseAddr + DynPage_addr + pageofs;
2059 len = tty_prepare_flip_string(tty, &dst,
2060 min(Page_size - pageofs, count));
2061 memcpy_fromio(dst, ofs, len);
2062
2063 count -= len;
2064 pageofs = (pageofs + len) & Page_mask;
2065 if (pageofs == 0 && ++pageno == epage)
2066 pageno = spage;
2067 }
2068 head = (head + total) & rx_mask;
2069 }
2070 writew(head, ofsAddr + RXrptr);
2071 if (readb(ofsAddr + FlagStat) & Xoff_state) {
2072 moxaLowWaterChk = 1;
2073 port->lowChkFlag = 1;
2074 }
2075 return total;
2076 }
2077
2078
2079 static int MoxaPortTxQueue(struct moxa_port *port)
2080 {
2081 void __iomem *ofsAddr = port->tableAddr;
2082 u16 rptr, wptr, mask;
2083
2084 rptr = readw(ofsAddr + TXrptr);
2085 wptr = readw(ofsAddr + TXwptr);
2086 mask = readw(ofsAddr + TX_mask);
2087 return (wptr - rptr) & mask;
2088 }
2089
2090 static int MoxaPortTxFree(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 mask - ((wptr - rptr) & mask);
2099 }
2100
2101 static int MoxaPortRxQueue(struct moxa_port *port)
2102 {
2103 void __iomem *ofsAddr = port->tableAddr;
2104 u16 rptr, wptr, mask;
2105
2106 rptr = readw(ofsAddr + RXrptr);
2107 wptr = readw(ofsAddr + RXwptr);
2108 mask = readw(ofsAddr + RX_mask);
2109 return (wptr - rptr) & mask;
2110 }
2111
2112 static void MoxaPortTxDisable(struct moxa_port *port)
2113 {
2114 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2115 }
2116
2117 static void MoxaPortTxEnable(struct moxa_port *port)
2118 {
2119 moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2120 }
2121
2122 static int moxa_get_serial_info(struct moxa_port *info,
2123 struct serial_struct __user *retinfo)
2124 {
2125 struct serial_struct tmp = {
2126 .type = info->type,
2127 .line = info->tty->index,
2128 .flags = info->asyncflags,
2129 .baud_base = 921600,
2130 .close_delay = info->close_delay
2131 };
2132 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2133 }
2134
2135
2136 static int moxa_set_serial_info(struct moxa_port *info,
2137 struct serial_struct __user *new_info)
2138 {
2139 struct serial_struct new_serial;
2140
2141 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2142 return -EFAULT;
2143
2144 if (new_serial.irq != 0 || new_serial.port != 0 ||
2145 new_serial.custom_divisor != 0 ||
2146 new_serial.baud_base != 921600)
2147 return -EPERM;
2148
2149 if (!capable(CAP_SYS_ADMIN)) {
2150 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2151 (info->asyncflags & ~ASYNC_USR_MASK)))
2152 return -EPERM;
2153 } else
2154 info->close_delay = new_serial.close_delay * HZ / 100;
2155
2156 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2157 new_serial.flags |= (info->asyncflags & ASYNC_FLAGS);
2158
2159 MoxaSetFifo(info, new_serial.type == PORT_16550A);
2160
2161 info->type = new_serial.type;
2162 return 0;
2163 }
2164
2165
2166
2167 /*****************************************************************************
2168 * Static local functions: *
2169 *****************************************************************************/
2170
2171 static void MoxaSetFifo(struct moxa_port *port, int enable)
2172 {
2173 void __iomem *ofsAddr = port->tableAddr;
2174
2175 if (!enable) {
2176 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2177 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2178 } else {
2179 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2180 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2181 }
2182 }
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