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linux
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/smp_lock.h>
38#include <linux/string.h>
39#include <linux/fcntl.h>
40#include <linux/ptrace.h>
41#include <linux/serial.h>
42#include <linux/tty_driver.h>
43#include <linux/delay.h>
44#include <linux/pci.h>
45#include <linux/init.h>
46#include <linux/bitops.h>
47
48#include <asm/system.h>
49#include <asm/io.h>
50#include <asm/uaccess.h>
51
52#include "moxa.h"
53
54#define MOXA_VERSION "6.0k"
55
56#define MOXA_FW_HDRLEN 32
57
58#define MOXAMAJOR 172
59
60#define MAX_BOARDS 4 /* Don't change this value */
61#define MAX_PORTS_PER_BOARD 32 /* Don't change this value */
62#define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD)
63
64#define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
65 (brd)->boardType == MOXA_BOARD_C320_PCI)
66
67/*
68 * Define the Moxa PCI vendor and device IDs.
69 */
70#define MOXA_BUS_TYPE_ISA 0
71#define MOXA_BUS_TYPE_PCI 1
72
73enum {
74 MOXA_BOARD_C218_PCI = 1,
75 MOXA_BOARD_C218_ISA,
76 MOXA_BOARD_C320_PCI,
77 MOXA_BOARD_C320_ISA,
78 MOXA_BOARD_CP204J,
79};
80
81static char *moxa_brdname[] =
82{
83 "C218 Turbo PCI series",
84 "C218 Turbo ISA series",
85 "C320 Turbo PCI series",
86 "C320 Turbo ISA series",
87 "CP-204J series",
88};
89
90#ifdef CONFIG_PCI
91static struct pci_device_id moxa_pcibrds[] = {
92 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
93 .driver_data = MOXA_BOARD_C218_PCI },
94 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
95 .driver_data = MOXA_BOARD_C320_PCI },
96 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
97 .driver_data = MOXA_BOARD_CP204J },
98 { 0 }
99};
100MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
101#endif /* CONFIG_PCI */
102
103struct moxa_port;
104
105static struct moxa_board_conf {
106 int boardType;
107 int numPorts;
108 int busType;
109
110 unsigned int ready;
111
112 struct moxa_port *ports;
113
114 void __iomem *basemem;
115 void __iomem *intNdx;
116 void __iomem *intPend;
117 void __iomem *intTable;
118} moxa_boards[MAX_BOARDS];
119
120struct mxser_mstatus {
121 tcflag_t cflag;
122 int cts;
123 int dsr;
124 int ri;
125 int dcd;
126};
127
128struct moxaq_str {
129 int inq;
130 int outq;
131};
132
133struct moxa_port {
134 struct tty_port port;
135 struct moxa_board_conf *board;
136 void __iomem *tableAddr;
137
138 int type;
139 int cflag;
140 unsigned long statusflags;
141
142 u8 DCDState;
143 u8 lineCtrl;
144 u8 lowChkFlag;
145};
146
147struct mon_str {
148 int tick;
149 int rxcnt[MAX_PORTS];
150 int txcnt[MAX_PORTS];
151};
152
153/* statusflags */
154#define TXSTOPPED 0x1
155#define LOWWAIT 0x2
156#define EMPTYWAIT 0x4
157#define THROTTLE 0x8
158
159#define SERIAL_DO_RESTART
160
161#define WAKEUP_CHARS 256
162
163static int ttymajor = MOXAMAJOR;
164static struct mon_str moxaLog;
165static unsigned int moxaFuncTout = HZ / 2;
166static unsigned int moxaLowWaterChk;
167static DEFINE_MUTEX(moxa_openlock);
168/* Variables for insmod */
169#ifdef MODULE
170static unsigned long baseaddr[MAX_BOARDS];
171static unsigned int type[MAX_BOARDS];
172static unsigned int numports[MAX_BOARDS];
173#endif
174
175MODULE_AUTHOR("William Chen");
176MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
177MODULE_LICENSE("GPL");
178#ifdef MODULE
179module_param_array(type, uint, NULL, 0);
180MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
181module_param_array(baseaddr, ulong, NULL, 0);
182MODULE_PARM_DESC(baseaddr, "base address");
183module_param_array(numports, uint, NULL, 0);
184MODULE_PARM_DESC(numports, "numports (ignored for C218)");
185#endif
186module_param(ttymajor, int, 0);
187
188/*
189 * static functions:
190 */
191static int moxa_open(struct tty_struct *, struct file *);
192static void moxa_close(struct tty_struct *, struct file *);
193static int moxa_write(struct tty_struct *, const unsigned char *, int);
194static int moxa_write_room(struct tty_struct *);
195static void moxa_flush_buffer(struct tty_struct *);
196static int moxa_chars_in_buffer(struct tty_struct *);
197static void moxa_throttle(struct tty_struct *);
198static void moxa_unthrottle(struct tty_struct *);
199static void moxa_set_termios(struct tty_struct *, struct ktermios *);
200static void moxa_stop(struct tty_struct *);
201static void moxa_start(struct tty_struct *);
202static void moxa_hangup(struct tty_struct *);
203static int moxa_tiocmget(struct tty_struct *tty, struct file *file);
204static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
205 unsigned int set, unsigned int clear);
206static void moxa_poll(unsigned long);
207static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
208static void moxa_setup_empty_event(struct tty_struct *);
209static void moxa_shut_down(struct tty_struct *);
210static int moxa_carrier_raised(struct tty_port *);
211/*
212 * moxa board interface functions:
213 */
214static void MoxaPortEnable(struct moxa_port *);
215static void MoxaPortDisable(struct moxa_port *);
216static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
217static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
218static void MoxaPortLineCtrl(struct moxa_port *, int, int);
219static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
220static int MoxaPortLineStatus(struct moxa_port *);
221static void MoxaPortFlushData(struct moxa_port *, int);
222static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
223static int MoxaPortReadData(struct moxa_port *);
224static int MoxaPortTxQueue(struct moxa_port *);
225static int MoxaPortRxQueue(struct moxa_port *);
226static int MoxaPortTxFree(struct moxa_port *);
227static void MoxaPortTxDisable(struct moxa_port *);
228static void MoxaPortTxEnable(struct moxa_port *);
229static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
230static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
231static void MoxaSetFifo(struct moxa_port *port, int enable);
232
233/*
234 * I/O functions
235 */
236
237static void moxa_wait_finish(void __iomem *ofsAddr)
238{
239 unsigned long end = jiffies + moxaFuncTout;
240
241 while (readw(ofsAddr + FuncCode) != 0)
242 if (time_after(jiffies, end))
243 return;
244 if (readw(ofsAddr + FuncCode) != 0 && printk_ratelimit())
245 printk(KERN_WARNING "moxa function expired\n");
246}
247
248static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
249{
250 writew(arg, ofsAddr + FuncArg);
251 writew(cmd, ofsAddr + FuncCode);
252 moxa_wait_finish(ofsAddr);
253}
254
255static void moxa_low_water_check(void __iomem *ofsAddr)
256{
257 u16 rptr, wptr, mask, len;
258
259 if (readb(ofsAddr + FlagStat) & Xoff_state) {
260 rptr = readw(ofsAddr + RXrptr);
261 wptr = readw(ofsAddr + RXwptr);
262 mask = readw(ofsAddr + RX_mask);
263 len = (wptr - rptr) & mask;
264 if (len <= Low_water)
265 moxafunc(ofsAddr, FC_SendXon, 0);
266 }
267}
268
269/*
270 * TTY operations
271 */
272
273static int moxa_ioctl(struct tty_struct *tty, struct file *file,
274 unsigned int cmd, unsigned long arg)
275{
276 struct moxa_port *ch = tty->driver_data;
277 void __user *argp = (void __user *)arg;
278 int status, ret = 0;
279
280 if (tty->index == MAX_PORTS) {
281 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
282 cmd != MOXA_GETMSTATUS)
283 return -EINVAL;
284 } else if (!ch)
285 return -ENODEV;
286
287 switch (cmd) {
288 case MOXA_GETDATACOUNT:
289 moxaLog.tick = jiffies;
290 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
291 ret = -EFAULT;
292 break;
293 case MOXA_FLUSH_QUEUE:
294 MoxaPortFlushData(ch, arg);
295 break;
296 case MOXA_GET_IOQUEUE: {
297 struct moxaq_str __user *argm = argp;
298 struct moxaq_str tmp;
299 struct moxa_port *p;
300 unsigned int i, j;
301
302 mutex_lock(&moxa_openlock);
303 for (i = 0; i < MAX_BOARDS; i++) {
304 p = moxa_boards[i].ports;
305 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
306 memset(&tmp, 0, sizeof(tmp));
307 if (moxa_boards[i].ready) {
308 tmp.inq = MoxaPortRxQueue(p);
309 tmp.outq = MoxaPortTxQueue(p);
310 }
311 if (copy_to_user(argm, &tmp, sizeof(tmp))) {
312 mutex_unlock(&moxa_openlock);
313 return -EFAULT;
314 }
315 }
316 }
317 mutex_unlock(&moxa_openlock);
318 break;
319 } case MOXA_GET_OQUEUE:
320 status = MoxaPortTxQueue(ch);
321 ret = put_user(status, (unsigned long __user *)argp);
322 break;
323 case MOXA_GET_IQUEUE:
324 status = MoxaPortRxQueue(ch);
325 ret = put_user(status, (unsigned long __user *)argp);
326 break;
327 case MOXA_GETMSTATUS: {
328 struct mxser_mstatus __user *argm = argp;
329 struct mxser_mstatus tmp;
330 struct moxa_port *p;
331 unsigned int i, j;
332
333 mutex_lock(&moxa_openlock);
334 for (i = 0; i < MAX_BOARDS; i++) {
335 p = moxa_boards[i].ports;
336 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
337 struct tty_struct *ttyp;
338 memset(&tmp, 0, sizeof(tmp));
339 if (!moxa_boards[i].ready)
340 goto copy;
341
342 status = MoxaPortLineStatus(p);
343 if (status & 1)
344 tmp.cts = 1;
345 if (status & 2)
346 tmp.dsr = 1;
347 if (status & 4)
348 tmp.dcd = 1;
349
350 ttyp = tty_port_tty_get(&p->port);
351 if (!ttyp || !ttyp->termios)
352 tmp.cflag = p->cflag;
353 else
354 tmp.cflag = ttyp->termios->c_cflag;
355 tty_kref_put(tty);
356copy:
357 if (copy_to_user(argm, &tmp, sizeof(tmp))) {
358 mutex_unlock(&moxa_openlock);
359 return -EFAULT;
360 }
361 }
362 }
363 mutex_unlock(&moxa_openlock);
364 break;
365 }
366 case TIOCGSERIAL:
367 mutex_lock(&moxa_openlock);
368 ret = moxa_get_serial_info(ch, argp);
369 mutex_unlock(&moxa_openlock);
370 break;
371 case TIOCSSERIAL:
372 mutex_lock(&moxa_openlock);
373 ret = moxa_set_serial_info(ch, argp);
374 mutex_unlock(&moxa_openlock);
375 break;
376 default:
377 ret = -ENOIOCTLCMD;
378 }
379 return ret;
380}
381
382static int moxa_break_ctl(struct tty_struct *tty, int state)
383{
384 struct moxa_port *port = tty->driver_data;
385
386 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
387 Magic_code);
388 return 0;
389}
390
391static const struct tty_operations moxa_ops = {
392 .open = moxa_open,
393 .close = moxa_close,
394 .write = moxa_write,
395 .write_room = moxa_write_room,
396 .flush_buffer = moxa_flush_buffer,
397 .chars_in_buffer = moxa_chars_in_buffer,
398 .ioctl = moxa_ioctl,
399 .throttle = moxa_throttle,
400 .unthrottle = moxa_unthrottle,
401 .set_termios = moxa_set_termios,
402 .stop = moxa_stop,
403 .start = moxa_start,
404 .hangup = moxa_hangup,
405 .break_ctl = moxa_break_ctl,
406 .tiocmget = moxa_tiocmget,
407 .tiocmset = moxa_tiocmset,
408};
409
410static const struct tty_port_operations moxa_port_ops = {
411 .carrier_raised = moxa_carrier_raised,
412};
413
414static struct tty_driver *moxaDriver;
415static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
416static DEFINE_SPINLOCK(moxa_lock);
417
418/*
419 * HW init
420 */
421
422static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
423{
424 switch (brd->boardType) {
425 case MOXA_BOARD_C218_ISA:
426 case MOXA_BOARD_C218_PCI:
427 if (model != 1)
428 goto err;
429 break;
430 case MOXA_BOARD_CP204J:
431 if (model != 3)
432 goto err;
433 break;
434 default:
435 if (model != 2)
436 goto err;
437 break;
438 }
439 return 0;
440err:
441 return -EINVAL;
442}
443
444static int moxa_check_fw(const void *ptr)
445{
446 const __le16 *lptr = ptr;
447
448 if (*lptr != cpu_to_le16(0x7980))
449 return -EINVAL;
450
451 return 0;
452}
453
454static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
455 size_t len)
456{
457 void __iomem *baseAddr = brd->basemem;
458 u16 tmp;
459
460 writeb(HW_reset, baseAddr + Control_reg); /* reset */
461 msleep(10);
462 memset_io(baseAddr, 0, 4096);
463 memcpy_toio(baseAddr, buf, len); /* download BIOS */
464 writeb(0, baseAddr + Control_reg); /* restart */
465
466 msleep(2000);
467
468 switch (brd->boardType) {
469 case MOXA_BOARD_C218_ISA:
470 case MOXA_BOARD_C218_PCI:
471 tmp = readw(baseAddr + C218_key);
472 if (tmp != C218_KeyCode)
473 goto err;
474 break;
475 case MOXA_BOARD_CP204J:
476 tmp = readw(baseAddr + C218_key);
477 if (tmp != CP204J_KeyCode)
478 goto err;
479 break;
480 default:
481 tmp = readw(baseAddr + C320_key);
482 if (tmp != C320_KeyCode)
483 goto err;
484 tmp = readw(baseAddr + C320_status);
485 if (tmp != STS_init) {
486 printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
487 "module not found\n");
488 return -EIO;
489 }
490 break;
491 }
492
493 return 0;
494err:
495 printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
496 return -EIO;
497}
498
499static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
500 size_t len)
501{
502 void __iomem *baseAddr = brd->basemem;
503
504 if (len < 7168) {
505 printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
506 return -EINVAL;
507 }
508
509 writew(len - 7168 - 2, baseAddr + C320bapi_len);
510 writeb(1, baseAddr + Control_reg); /* Select Page 1 */
511 memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
512 writeb(2, baseAddr + Control_reg); /* Select Page 2 */
513 memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
514
515 return 0;
516}
517
518static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
519 size_t len)
520{
521 void __iomem *baseAddr = brd->basemem;
522 const __le16 *uptr = ptr;
523 size_t wlen, len2, j;
524 unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
525 unsigned int i, retry;
526 u16 usum, keycode;
527
528 keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
529 C218_KeyCode;
530
531 switch (brd->boardType) {
532 case MOXA_BOARD_CP204J:
533 case MOXA_BOARD_C218_ISA:
534 case MOXA_BOARD_C218_PCI:
535 key = C218_key;
536 loadbuf = C218_LoadBuf;
537 loadlen = C218DLoad_len;
538 checksum = C218check_sum;
539 checksum_ok = C218chksum_ok;
540 break;
541 default:
542 key = C320_key;
543 keycode = C320_KeyCode;
544 loadbuf = C320_LoadBuf;
545 loadlen = C320DLoad_len;
546 checksum = C320check_sum;
547 checksum_ok = C320chksum_ok;
548 break;
549 }
550
551 usum = 0;
552 wlen = len >> 1;
553 for (i = 0; i < wlen; i++)
554 usum += le16_to_cpu(uptr[i]);
555 retry = 0;
556 do {
557 wlen = len >> 1;
558 j = 0;
559 while (wlen) {
560 len2 = (wlen > 2048) ? 2048 : wlen;
561 wlen -= len2;
562 memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
563 j += len2 << 1;
564
565 writew(len2, baseAddr + loadlen);
566 writew(0, baseAddr + key);
567 for (i = 0; i < 100; i++) {
568 if (readw(baseAddr + key) == keycode)
569 break;
570 msleep(10);
571 }
572 if (readw(baseAddr + key) != keycode)
573 return -EIO;
574 }
575 writew(0, baseAddr + loadlen);
576 writew(usum, baseAddr + checksum);
577 writew(0, baseAddr + key);
578 for (i = 0; i < 100; i++) {
579 if (readw(baseAddr + key) == keycode)
580 break;
581 msleep(10);
582 }
583 retry++;
584 } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
585 if (readb(baseAddr + checksum_ok) != 1)
586 return -EIO;
587
588 writew(0, baseAddr + key);
589 for (i = 0; i < 600; i++) {
590 if (readw(baseAddr + Magic_no) == Magic_code)
591 break;
592 msleep(10);
593 }
594 if (readw(baseAddr + Magic_no) != Magic_code)
595 return -EIO;
596
597 if (MOXA_IS_320(brd)) {
598 if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */
599 writew(0x3800, baseAddr + TMS320_PORT1);
600 writew(0x3900, baseAddr + TMS320_PORT2);
601 writew(28499, baseAddr + TMS320_CLOCK);
602 } else {
603 writew(0x3200, baseAddr + TMS320_PORT1);
604 writew(0x3400, baseAddr + TMS320_PORT2);
605 writew(19999, baseAddr + TMS320_CLOCK);
606 }
607 }
608 writew(1, baseAddr + Disable_IRQ);
609 writew(0, baseAddr + Magic_no);
610 for (i = 0; i < 500; i++) {
611 if (readw(baseAddr + Magic_no) == Magic_code)
612 break;
613 msleep(10);
614 }
615 if (readw(baseAddr + Magic_no) != Magic_code)
616 return -EIO;
617
618 if (MOXA_IS_320(brd)) {
619 j = readw(baseAddr + Module_cnt);
620 if (j <= 0)
621 return -EIO;
622 brd->numPorts = j * 8;
623 writew(j, baseAddr + Module_no);
624 writew(0, baseAddr + Magic_no);
625 for (i = 0; i < 600; i++) {
626 if (readw(baseAddr + Magic_no) == Magic_code)
627 break;
628 msleep(10);
629 }
630 if (readw(baseAddr + Magic_no) != Magic_code)
631 return -EIO;
632 }
633 brd->intNdx = baseAddr + IRQindex;
634 brd->intPend = baseAddr + IRQpending;
635 brd->intTable = baseAddr + IRQtable;
636
637 return 0;
638}
639
640static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
641 size_t len)
642{
643 void __iomem *ofsAddr, *baseAddr = brd->basemem;
644 struct moxa_port *port;
645 int retval, i;
646
647 if (len % 2) {
648 printk(KERN_ERR "MOXA: bios length is not even\n");
649 return -EINVAL;
650 }
651
652 retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
653 if (retval)
654 return retval;
655
656 switch (brd->boardType) {
657 case MOXA_BOARD_C218_ISA:
658 case MOXA_BOARD_C218_PCI:
659 case MOXA_BOARD_CP204J:
660 port = brd->ports;
661 for (i = 0; i < brd->numPorts; i++, port++) {
662 port->board = brd;
663 port->DCDState = 0;
664 port->tableAddr = baseAddr + Extern_table +
665 Extern_size * i;
666 ofsAddr = port->tableAddr;
667 writew(C218rx_mask, ofsAddr + RX_mask);
668 writew(C218tx_mask, ofsAddr + TX_mask);
669 writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
670 writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
671
672 writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
673 writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
674
675 }
676 break;
677 default:
678 port = brd->ports;
679 for (i = 0; i < brd->numPorts; i++, port++) {
680 port->board = brd;
681 port->DCDState = 0;
682 port->tableAddr = baseAddr + Extern_table +
683 Extern_size * i;
684 ofsAddr = port->tableAddr;
685 switch (brd->numPorts) {
686 case 8:
687 writew(C320p8rx_mask, ofsAddr + RX_mask);
688 writew(C320p8tx_mask, ofsAddr + TX_mask);
689 writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
690 writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
691 writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
692 writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
693
694 break;
695 case 16:
696 writew(C320p16rx_mask, ofsAddr + RX_mask);
697 writew(C320p16tx_mask, ofsAddr + TX_mask);
698 writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
699 writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
700 writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
701 writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
702 break;
703
704 case 24:
705 writew(C320p24rx_mask, ofsAddr + RX_mask);
706 writew(C320p24tx_mask, ofsAddr + TX_mask);
707 writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
708 writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
709 writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
710 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
711 break;
712 case 32:
713 writew(C320p32rx_mask, ofsAddr + RX_mask);
714 writew(C320p32tx_mask, ofsAddr + TX_mask);
715 writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
716 writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
717 writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
718 writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
719 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
720 break;
721 }
722 }
723 break;
724 }
725 return 0;
726}
727
728static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
729{
730 const void *ptr = fw->data;
731 char rsn[64];
732 u16 lens[5];
733 size_t len;
734 unsigned int a, lenp, lencnt;
735 int ret = -EINVAL;
736 struct {
737 __le32 magic; /* 0x34303430 */
738 u8 reserved1[2];
739 u8 type; /* UNIX = 3 */
740 u8 model; /* C218T=1, C320T=2, CP204=3 */
741 u8 reserved2[8];
742 __le16 len[5];
743 } const *hdr = ptr;
744
745 BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
746
747 if (fw->size < MOXA_FW_HDRLEN) {
748 strcpy(rsn, "too short (even header won't fit)");
749 goto err;
750 }
751 if (hdr->magic != cpu_to_le32(0x30343034)) {
752 sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
753 goto err;
754 }
755 if (hdr->type != 3) {
756 sprintf(rsn, "not for linux, type is %u", hdr->type);
757 goto err;
758 }
759 if (moxa_check_fw_model(brd, hdr->model)) {
760 sprintf(rsn, "not for this card, model is %u", hdr->model);
761 goto err;
762 }
763
764 len = MOXA_FW_HDRLEN;
765 lencnt = hdr->model == 2 ? 5 : 3;
766 for (a = 0; a < ARRAY_SIZE(lens); a++) {
767 lens[a] = le16_to_cpu(hdr->len[a]);
768 if (lens[a] && len + lens[a] <= fw->size &&
769 moxa_check_fw(&fw->data[len]))
770 printk(KERN_WARNING "MOXA firmware: unexpected input "
771 "at offset %u, but going on\n", (u32)len);
772 if (!lens[a] && a < lencnt) {
773 sprintf(rsn, "too few entries in fw file");
774 goto err;
775 }
776 len += lens[a];
777 }
778
779 if (len != fw->size) {
780 sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
781 (u32)len);
782 goto err;
783 }
784
785 ptr += MOXA_FW_HDRLEN;
786 lenp = 0; /* bios */
787
788 strcpy(rsn, "read above");
789
790 ret = moxa_load_bios(brd, ptr, lens[lenp]);
791 if (ret)
792 goto err;
793
794 /* we skip the tty section (lens[1]), since we don't need it */
795 ptr += lens[lenp] + lens[lenp + 1];
796 lenp += 2; /* comm */
797
798 if (hdr->model == 2) {
799 ret = moxa_load_320b(brd, ptr, lens[lenp]);
800 if (ret)
801 goto err;
802 /* skip another tty */
803 ptr += lens[lenp] + lens[lenp + 1];
804 lenp += 2;
805 }
806
807 ret = moxa_load_code(brd, ptr, lens[lenp]);
808 if (ret)
809 goto err;
810
811 return 0;
812err:
813 printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
814 return ret;
815}
816
817static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
818{
819 const struct firmware *fw;
820 const char *file;
821 struct moxa_port *p;
822 unsigned int i;
823 int ret;
824
825 brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
826 GFP_KERNEL);
827 if (brd->ports == NULL) {
828 printk(KERN_ERR "cannot allocate memory for ports\n");
829 ret = -ENOMEM;
830 goto err;
831 }
832
833 for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
834 tty_port_init(&p->port);
835 p->port.ops = &moxa_port_ops;
836 p->type = PORT_16550A;
837 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
838 }
839
840 switch (brd->boardType) {
841 case MOXA_BOARD_C218_ISA:
842 case MOXA_BOARD_C218_PCI:
843 file = "c218tunx.cod";
844 break;
845 case MOXA_BOARD_CP204J:
846 file = "cp204unx.cod";
847 break;
848 default:
849 file = "c320tunx.cod";
850 break;
851 }
852
853 ret = request_firmware(&fw, file, dev);
854 if (ret) {
855 printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
856 "you've placed '%s' file into your firmware "
857 "loader directory (e.g. /lib/firmware)\n",
858 file);
859 goto err_free;
860 }
861
862 ret = moxa_load_fw(brd, fw);
863
864 release_firmware(fw);
865
866 if (ret)
867 goto err_free;
868
869 spin_lock_bh(&moxa_lock);
870 brd->ready = 1;
871 if (!timer_pending(&moxaTimer))
872 mod_timer(&moxaTimer, jiffies + HZ / 50);
873 spin_unlock_bh(&moxa_lock);
874
875 return 0;
876err_free:
877 kfree(brd->ports);
878err:
879 return ret;
880}
881
882static void moxa_board_deinit(struct moxa_board_conf *brd)
883{
884 unsigned int a, opened;
885
886 mutex_lock(&moxa_openlock);
887 spin_lock_bh(&moxa_lock);
888 brd->ready = 0;
889 spin_unlock_bh(&moxa_lock);
890
891 /* pci hot-un-plug support */
892 for (a = 0; a < brd->numPorts; a++)
893 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
894 struct tty_struct *tty = tty_port_tty_get(
895 &brd->ports[a].port);
896 if (tty) {
897 tty_hangup(tty);
898 tty_kref_put(tty);
899 }
900 }
901 while (1) {
902 opened = 0;
903 for (a = 0; a < brd->numPorts; a++)
904 if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
905 opened++;
906 mutex_unlock(&moxa_openlock);
907 if (!opened)
908 break;
909 msleep(50);
910 mutex_lock(&moxa_openlock);
911 }
912
913 iounmap(brd->basemem);
914 brd->basemem = NULL;
915 kfree(brd->ports);
916}
917
918#ifdef CONFIG_PCI
919static int __devinit moxa_pci_probe(struct pci_dev *pdev,
920 const struct pci_device_id *ent)
921{
922 struct moxa_board_conf *board;
923 unsigned int i;
924 int board_type = ent->driver_data;
925 int retval;
926
927 retval = pci_enable_device(pdev);
928 if (retval) {
929 dev_err(&pdev->dev, "can't enable pci device\n");
930 goto err;
931 }
932
933 for (i = 0; i < MAX_BOARDS; i++)
934 if (moxa_boards[i].basemem == NULL)
935 break;
936
937 retval = -ENODEV;
938 if (i >= MAX_BOARDS) {
939 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
940 "found. Board is ignored.\n", MAX_BOARDS);
941 goto err;
942 }
943
944 board = &moxa_boards[i];
945
946 retval = pci_request_region(pdev, 2, "moxa-base");
947 if (retval) {
948 dev_err(&pdev->dev, "can't request pci region 2\n");
949 goto err;
950 }
951
952 board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
953 if (board->basemem == NULL) {
954 dev_err(&pdev->dev, "can't remap io space 2\n");
955 goto err_reg;
956 }
957
958 board->boardType = board_type;
959 switch (board_type) {
960 case MOXA_BOARD_C218_ISA:
961 case MOXA_BOARD_C218_PCI:
962 board->numPorts = 8;
963 break;
964
965 case MOXA_BOARD_CP204J:
966 board->numPorts = 4;
967 break;
968 default:
969 board->numPorts = 0;
970 break;
971 }
972 board->busType = MOXA_BUS_TYPE_PCI;
973
974 retval = moxa_init_board(board, &pdev->dev);
975 if (retval)
976 goto err_base;
977
978 pci_set_drvdata(pdev, board);
979
980 dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
981 moxa_brdname[board_type - 1], board->numPorts);
982
983 return 0;
984err_base:
985 iounmap(board->basemem);
986 board->basemem = NULL;
987err_reg:
988 pci_release_region(pdev, 2);
989err:
990 return retval;
991}
992
993static void __devexit moxa_pci_remove(struct pci_dev *pdev)
994{
995 struct moxa_board_conf *brd = pci_get_drvdata(pdev);
996
997 moxa_board_deinit(brd);
998
999 pci_release_region(pdev, 2);
1000}
1001
1002static struct pci_driver moxa_pci_driver = {
1003 .name = "moxa",
1004 .id_table = moxa_pcibrds,
1005 .probe = moxa_pci_probe,
1006 .remove = __devexit_p(moxa_pci_remove)
1007};
1008#endif /* CONFIG_PCI */
1009
1010static int __init moxa_init(void)
1011{
1012 unsigned int isabrds = 0;
1013 int retval = 0;
1014
1015 printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1016 MOXA_VERSION);
1017 moxaDriver = alloc_tty_driver(MAX_PORTS + 1);
1018 if (!moxaDriver)
1019 return -ENOMEM;
1020
1021 moxaDriver->owner = THIS_MODULE;
1022 moxaDriver->name = "ttyMX";
1023 moxaDriver->major = ttymajor;
1024 moxaDriver->minor_start = 0;
1025 moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1026 moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1027 moxaDriver->init_termios = tty_std_termios;
1028 moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1029 moxaDriver->init_termios.c_ispeed = 9600;
1030 moxaDriver->init_termios.c_ospeed = 9600;
1031 moxaDriver->flags = TTY_DRIVER_REAL_RAW;
1032 tty_set_operations(moxaDriver, &moxa_ops);
1033
1034 if (tty_register_driver(moxaDriver)) {
1035 printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1036 put_tty_driver(moxaDriver);
1037 return -1;
1038 }
1039
1040 /* Find the boards defined from module args. */
1041#ifdef MODULE
1042 {
1043 struct moxa_board_conf *brd = moxa_boards;
1044 unsigned int i;
1045 for (i = 0; i < MAX_BOARDS; i++) {
1046 if (!baseaddr[i])
1047 break;
1048 if (type[i] == MOXA_BOARD_C218_ISA ||
1049 type[i] == MOXA_BOARD_C320_ISA) {
1050 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1051 isabrds + 1, moxa_brdname[type[i] - 1],
1052 baseaddr[i]);
1053 brd->boardType = type[i];
1054 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1055 numports[i];
1056 brd->busType = MOXA_BUS_TYPE_ISA;
1057 brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1058 if (!brd->basemem) {
1059 printk(KERN_ERR "MOXA: can't remap %lx\n",
1060 baseaddr[i]);
1061 continue;
1062 }
1063 if (moxa_init_board(brd, NULL)) {
1064 iounmap(brd->basemem);
1065 brd->basemem = NULL;
1066 continue;
1067 }
1068
1069 printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1070 "ready (%u ports, firmware loaded)\n",
1071 baseaddr[i], brd->numPorts);
1072
1073 brd++;
1074 isabrds++;
1075 }
1076 }
1077 }
1078#endif
1079
1080#ifdef CONFIG_PCI
1081 retval = pci_register_driver(&moxa_pci_driver);
1082 if (retval) {
1083 printk(KERN_ERR "Can't register MOXA pci driver!\n");
1084 if (isabrds)
1085 retval = 0;
1086 }
1087#endif
1088
1089 return retval;
1090}
1091
1092static void __exit moxa_exit(void)
1093{
1094 unsigned int i;
1095
1096#ifdef CONFIG_PCI
1097 pci_unregister_driver(&moxa_pci_driver);
1098#endif
1099
1100 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1101 if (moxa_boards[i].ready)
1102 moxa_board_deinit(&moxa_boards[i]);
1103
1104 del_timer_sync(&moxaTimer);
1105
1106 if (tty_unregister_driver(moxaDriver))
1107 printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1108 "serial driver\n");
1109 put_tty_driver(moxaDriver);
1110}
1111
1112module_init(moxa_init);
1113module_exit(moxa_exit);
1114
1115static void moxa_close_port(struct tty_struct *tty)
1116{
1117 struct moxa_port *ch = tty->driver_data;
1118 moxa_shut_down(tty);
1119 MoxaPortFlushData(ch, 2);
1120 ch->port.flags &= ~ASYNC_NORMAL_ACTIVE;
1121 tty->driver_data = NULL;
1122 tty_port_tty_set(&ch->port, NULL);
1123}
1124
1125static int moxa_carrier_raised(struct tty_port *port)
1126{
1127 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1128 int dcd;
1129
1130 spin_lock_bh(&moxa_lock);
1131 dcd = ch->DCDState;
1132 spin_unlock_bh(&moxa_lock);
1133 return dcd;
1134}
1135
1136static int moxa_block_till_ready(struct tty_struct *tty, struct file *filp,
1137 struct moxa_port *ch)
1138{
1139 struct tty_port *port = &ch->port;
1140 DEFINE_WAIT(wait);
1141 int retval = 0;
1142 u8 dcd;
1143
1144 while (1) {
1145 prepare_to_wait(&port->open_wait, &wait, TASK_INTERRUPTIBLE);
1146 if (tty_hung_up_p(filp)) {
1147#ifdef SERIAL_DO_RESTART
1148 retval = -ERESTARTSYS;
1149#else
1150 retval = -EAGAIN;
1151#endif
1152 break;
1153 }
1154 dcd = tty_port_carrier_raised(port);
1155 if (dcd)
1156 break;
1157
1158 if (signal_pending(current)) {
1159 retval = -ERESTARTSYS;
1160 break;
1161 }
1162 schedule();
1163 }
1164 finish_wait(&port->open_wait, &wait);
1165
1166 return retval;
1167}
1168
1169static int moxa_open(struct tty_struct *tty, struct file *filp)
1170{
1171 struct moxa_board_conf *brd;
1172 struct moxa_port *ch;
1173 int port;
1174 int retval;
1175
1176 port = tty->index;
1177 if (port == MAX_PORTS) {
1178 return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1179 }
1180 if (mutex_lock_interruptible(&moxa_openlock))
1181 return -ERESTARTSYS;
1182 brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1183 if (!brd->ready) {
1184 mutex_unlock(&moxa_openlock);
1185 return -ENODEV;
1186 }
1187
1188 if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1189 mutex_unlock(&moxa_openlock);
1190 return -ENODEV;
1191 }
1192
1193 ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1194 ch->port.count++;
1195 tty->driver_data = ch;
1196 tty_port_tty_set(&ch->port, tty);
1197 if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1198 ch->statusflags = 0;
1199 moxa_set_tty_param(tty, tty->termios);
1200 MoxaPortLineCtrl(ch, 1, 1);
1201 MoxaPortEnable(ch);
1202 MoxaSetFifo(ch, ch->type == PORT_16550A);
1203 ch->port.flags |= ASYNC_INITIALIZED;
1204 }
1205 mutex_unlock(&moxa_openlock);
1206
1207 retval = 0;
1208 if (!(filp->f_flags & O_NONBLOCK) && !C_CLOCAL(tty))
1209 retval = moxa_block_till_ready(tty, filp, ch);
1210 mutex_lock(&moxa_openlock);
1211 if (retval) {
1212 if (ch->port.count) /* 0 means already hung up... */
1213 if (--ch->port.count == 0)
1214 moxa_close_port(tty);
1215 } else
1216 ch->port.flags |= ASYNC_NORMAL_ACTIVE;
1217 mutex_unlock(&moxa_openlock);
1218
1219 return retval;
1220}
1221
1222static void moxa_close(struct tty_struct *tty, struct file *filp)
1223{
1224 struct moxa_port *ch;
1225 int port;
1226
1227 port = tty->index;
1228 if (port == MAX_PORTS || tty_hung_up_p(filp))
1229 return;
1230
1231 mutex_lock(&moxa_openlock);
1232 ch = tty->driver_data;
1233 if (ch == NULL)
1234 goto unlock;
1235 if (tty->count == 1 && ch->port.count != 1) {
1236 printk(KERN_WARNING "moxa_close: bad serial port count; "
1237 "tty->count is 1, ch->port.count is %d\n", ch->port.count);
1238 ch->port.count = 1;
1239 }
1240 if (--ch->port.count < 0) {
1241 printk(KERN_WARNING "moxa_close: bad serial port count, "
1242 "device=%s\n", tty->name);
1243 ch->port.count = 0;
1244 }
1245 if (ch->port.count)
1246 goto unlock;
1247
1248 ch->cflag = tty->termios->c_cflag;
1249 if (ch->port.flags & ASYNC_INITIALIZED) {
1250 moxa_setup_empty_event(tty);
1251 tty_wait_until_sent(tty, 30 * HZ); /* 30 seconds timeout */
1252 }
1253
1254 moxa_close_port(tty);
1255unlock:
1256 mutex_unlock(&moxa_openlock);
1257}
1258
1259static int moxa_write(struct tty_struct *tty,
1260 const unsigned char *buf, int count)
1261{
1262 struct moxa_port *ch = tty->driver_data;
1263 int len;
1264
1265 if (ch == NULL)
1266 return 0;
1267
1268 spin_lock_bh(&moxa_lock);
1269 len = MoxaPortWriteData(tty, buf, count);
1270 spin_unlock_bh(&moxa_lock);
1271
1272 ch->statusflags |= LOWWAIT;
1273 return len;
1274}
1275
1276static int moxa_write_room(struct tty_struct *tty)
1277{
1278 struct moxa_port *ch;
1279
1280 if (tty->stopped)
1281 return 0;
1282 ch = tty->driver_data;
1283 if (ch == NULL)
1284 return 0;
1285 return MoxaPortTxFree(ch);
1286}
1287
1288static void moxa_flush_buffer(struct tty_struct *tty)
1289{
1290 struct moxa_port *ch = tty->driver_data;
1291
1292 if (ch == NULL)
1293 return;
1294 MoxaPortFlushData(ch, 1);
1295 tty_wakeup(tty);
1296}
1297
1298static int moxa_chars_in_buffer(struct tty_struct *tty)
1299{
1300 struct moxa_port *ch = tty->driver_data;
1301 int chars;
1302
1303 /*
1304 * Sigh...I have to check if driver_data is NULL here, because
1305 * if an open() fails, the TTY subsystem eventually calls
1306 * tty_wait_until_sent(), which calls the driver's chars_in_buffer()
1307 * routine. And since the open() failed, we return 0 here. TDJ
1308 */
1309 if (ch == NULL)
1310 return 0;
1311 lock_kernel();
1312 chars = MoxaPortTxQueue(ch);
1313 if (chars) {
1314 /*
1315 * Make it possible to wakeup anything waiting for output
1316 * in tty_ioctl.c, etc.
1317 */
1318 if (!(ch->statusflags & EMPTYWAIT))
1319 moxa_setup_empty_event(tty);
1320 }
1321 unlock_kernel();
1322 return chars;
1323}
1324
1325static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
1326{
1327 struct moxa_port *ch;
1328 int flag = 0, dtr, rts;
1329
1330 mutex_lock(&moxa_openlock);
1331 ch = tty->driver_data;
1332 if (!ch) {
1333 mutex_unlock(&moxa_openlock);
1334 return -EINVAL;
1335 }
1336
1337 MoxaPortGetLineOut(ch, &dtr, &rts);
1338 if (dtr)
1339 flag |= TIOCM_DTR;
1340 if (rts)
1341 flag |= TIOCM_RTS;
1342 dtr = MoxaPortLineStatus(ch);
1343 if (dtr & 1)
1344 flag |= TIOCM_CTS;
1345 if (dtr & 2)
1346 flag |= TIOCM_DSR;
1347 if (dtr & 4)
1348 flag |= TIOCM_CD;
1349 mutex_unlock(&moxa_openlock);
1350 return flag;
1351}
1352
1353static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
1354 unsigned int set, unsigned int clear)
1355{
1356 struct moxa_port *ch;
1357 int port;
1358 int dtr, rts;
1359
1360 port = tty->index;
1361 mutex_lock(&moxa_openlock);
1362 ch = tty->driver_data;
1363 if (!ch) {
1364 mutex_unlock(&moxa_openlock);
1365 return -EINVAL;
1366 }
1367
1368 MoxaPortGetLineOut(ch, &dtr, &rts);
1369 if (set & TIOCM_RTS)
1370 rts = 1;
1371 if (set & TIOCM_DTR)
1372 dtr = 1;
1373 if (clear & TIOCM_RTS)
1374 rts = 0;
1375 if (clear & TIOCM_DTR)
1376 dtr = 0;
1377 MoxaPortLineCtrl(ch, dtr, rts);
1378 mutex_unlock(&moxa_openlock);
1379 return 0;
1380}
1381
1382static void moxa_throttle(struct tty_struct *tty)
1383{
1384 struct moxa_port *ch = tty->driver_data;
1385
1386 ch->statusflags |= THROTTLE;
1387}
1388
1389static void moxa_unthrottle(struct tty_struct *tty)
1390{
1391 struct moxa_port *ch = tty->driver_data;
1392
1393 ch->statusflags &= ~THROTTLE;
1394}
1395
1396static void moxa_set_termios(struct tty_struct *tty,
1397 struct ktermios *old_termios)
1398{
1399 struct moxa_port *ch = tty->driver_data;
1400
1401 if (ch == NULL)
1402 return;
1403 moxa_set_tty_param(tty, old_termios);
1404 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1405 wake_up_interruptible(&ch->port.open_wait);
1406}
1407
1408static void moxa_stop(struct tty_struct *tty)
1409{
1410 struct moxa_port *ch = tty->driver_data;
1411
1412 if (ch == NULL)
1413 return;
1414 MoxaPortTxDisable(ch);
1415 ch->statusflags |= TXSTOPPED;
1416}
1417
1418
1419static void moxa_start(struct tty_struct *tty)
1420{
1421 struct moxa_port *ch = tty->driver_data;
1422
1423 if (ch == NULL)
1424 return;
1425
1426 if (!(ch->statusflags & TXSTOPPED))
1427 return;
1428
1429 MoxaPortTxEnable(ch);
1430 ch->statusflags &= ~TXSTOPPED;
1431}
1432
1433static void moxa_hangup(struct tty_struct *tty)
1434{
1435 struct moxa_port *ch;
1436
1437 mutex_lock(&moxa_openlock);
1438 ch = tty->driver_data;
1439 if (ch == NULL) {
1440 mutex_unlock(&moxa_openlock);
1441 return;
1442 }
1443 ch->port.count = 0;
1444 moxa_close_port(tty);
1445 mutex_unlock(&moxa_openlock);
1446
1447 wake_up_interruptible(&ch->port.open_wait);
1448}
1449
1450static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1451{
1452 struct tty_struct *tty;
1453 dcd = !!dcd;
1454
1455 if (dcd != p->DCDState) {
1456 tty = tty_port_tty_get(&p->port);
1457 if (tty && C_CLOCAL(tty) && !dcd)
1458 tty_hangup(tty);
1459 tty_kref_put(tty);
1460 }
1461 p->DCDState = dcd;
1462}
1463
1464static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1465 u16 __iomem *ip)
1466{
1467 struct tty_struct *tty = tty_port_tty_get(&p->port);
1468 void __iomem *ofsAddr;
1469 unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1470 u16 intr;
1471
1472 if (tty) {
1473 if ((p->statusflags & EMPTYWAIT) &&
1474 MoxaPortTxQueue(p) == 0) {
1475 p->statusflags &= ~EMPTYWAIT;
1476 tty_wakeup(tty);
1477 }
1478 if ((p->statusflags & LOWWAIT) && !tty->stopped &&
1479 MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1480 p->statusflags &= ~LOWWAIT;
1481 tty_wakeup(tty);
1482 }
1483
1484 if (inited && !(p->statusflags & THROTTLE) &&
1485 MoxaPortRxQueue(p) > 0) { /* RX */
1486 MoxaPortReadData(p);
1487 tty_schedule_flip(tty);
1488 }
1489 } else {
1490 p->statusflags &= ~EMPTYWAIT;
1491 MoxaPortFlushData(p, 0); /* flush RX */
1492 }
1493
1494 if (!handle) /* nothing else to do */
1495 goto put;
1496
1497 intr = readw(ip); /* port irq status */
1498 if (intr == 0)
1499 goto put;
1500
1501 writew(0, ip); /* ACK port */
1502 ofsAddr = p->tableAddr;
1503 if (intr & IntrTx) /* disable tx intr */
1504 writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1505 ofsAddr + HostStat);
1506
1507 if (!inited)
1508 goto put;
1509
1510 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1511 tty_insert_flip_char(tty, 0, TTY_BREAK);
1512 tty_schedule_flip(tty);
1513 }
1514
1515 if (intr & IntrLine)
1516 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1517put:
1518 tty_kref_put(tty);
1519
1520 return 0;
1521}
1522
1523static void moxa_poll(unsigned long ignored)
1524{
1525 struct moxa_board_conf *brd;
1526 u16 __iomem *ip;
1527 unsigned int card, port, served = 0;
1528
1529 spin_lock(&moxa_lock);
1530 for (card = 0; card < MAX_BOARDS; card++) {
1531 brd = &moxa_boards[card];
1532 if (!brd->ready)
1533 continue;
1534
1535 served++;
1536
1537 ip = NULL;
1538 if (readb(brd->intPend) == 0xff)
1539 ip = brd->intTable + readb(brd->intNdx);
1540
1541 for (port = 0; port < brd->numPorts; port++)
1542 moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1543
1544 if (ip)
1545 writeb(0, brd->intPend); /* ACK */
1546
1547 if (moxaLowWaterChk) {
1548 struct moxa_port *p = brd->ports;
1549 for (port = 0; port < brd->numPorts; port++, p++)
1550 if (p->lowChkFlag) {
1551 p->lowChkFlag = 0;
1552 moxa_low_water_check(p->tableAddr);
1553 }
1554 }
1555 }
1556 moxaLowWaterChk = 0;
1557
1558 if (served)
1559 mod_timer(&moxaTimer, jiffies + HZ / 50);
1560 spin_unlock(&moxa_lock);
1561}
1562
1563/******************************************************************************/
1564
1565static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1566{
1567 register struct ktermios *ts = tty->termios;
1568 struct moxa_port *ch = tty->driver_data;
1569 int rts, cts, txflow, rxflow, xany, baud;
1570
1571 rts = cts = txflow = rxflow = xany = 0;
1572 if (ts->c_cflag & CRTSCTS)
1573 rts = cts = 1;
1574 if (ts->c_iflag & IXON)
1575 txflow = 1;
1576 if (ts->c_iflag & IXOFF)
1577 rxflow = 1;
1578 if (ts->c_iflag & IXANY)
1579 xany = 1;
1580
1581 /* Clear the features we don't support */
1582 ts->c_cflag &= ~CMSPAR;
1583 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1584 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1585 if (baud == -1)
1586 baud = tty_termios_baud_rate(old_termios);
1587 /* Not put the baud rate into the termios data */
1588 tty_encode_baud_rate(tty, baud, baud);
1589}
1590
1591static void moxa_setup_empty_event(struct tty_struct *tty)
1592{
1593 struct moxa_port *ch = tty->driver_data;
1594
1595 spin_lock_bh(&moxa_lock);
1596 ch->statusflags |= EMPTYWAIT;
1597 spin_unlock_bh(&moxa_lock);
1598}
1599
1600static void moxa_shut_down(struct tty_struct *tty)
1601{
1602 struct moxa_port *ch = tty->driver_data;
1603
1604 if (!(ch->port.flags & ASYNC_INITIALIZED))
1605 return;
1606
1607 MoxaPortDisable(ch);
1608
1609 /*
1610 * If we're a modem control device and HUPCL is on, drop RTS & DTR.
1611 */
1612 if (C_HUPCL(tty))
1613 MoxaPortLineCtrl(ch, 0, 0);
1614
1615 spin_lock_bh(&moxa_lock);
1616 ch->port.flags &= ~ASYNC_INITIALIZED;
1617 spin_unlock_bh(&moxa_lock);
1618}
1619
1620/*****************************************************************************
1621 * Driver level functions: *
1622 *****************************************************************************/
1623
1624static void MoxaPortFlushData(struct moxa_port *port, int mode)
1625{
1626 void __iomem *ofsAddr;
1627 if (mode < 0 || mode > 2)
1628 return;
1629 ofsAddr = port->tableAddr;
1630 moxafunc(ofsAddr, FC_FlushQueue, mode);
1631 if (mode != 1) {
1632 port->lowChkFlag = 0;
1633 moxa_low_water_check(ofsAddr);
1634 }
1635}
1636
1637/*
1638 * Moxa Port Number Description:
1639 *
1640 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1641 * the port number using in MOXA driver functions will be 0 to 31 for
1642 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1643 * to 127 for fourth. For example, if you setup three MOXA boards,
1644 * first board is C218, second board is C320-16 and third board is
1645 * C320-32. The port number of first board (C218 - 8 ports) is from
1646 * 0 to 7. The port number of second board (C320 - 16 ports) is form
1647 * 32 to 47. The port number of third board (C320 - 32 ports) is from
1648 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1649 * 127 will be invalid.
1650 *
1651 *
1652 * Moxa Functions Description:
1653 *
1654 * Function 1: Driver initialization routine, this routine must be
1655 * called when initialized driver.
1656 * Syntax:
1657 * void MoxaDriverInit();
1658 *
1659 *
1660 * Function 2: Moxa driver private IOCTL command processing.
1661 * Syntax:
1662 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1663 *
1664 * unsigned int cmd : IOCTL command
1665 * unsigned long arg : IOCTL argument
1666 * int port : port number (0 - 127)
1667 *
1668 * return: 0 (OK)
1669 * -EINVAL
1670 * -ENOIOCTLCMD
1671 *
1672 *
1673 * Function 6: Enable this port to start Tx/Rx data.
1674 * Syntax:
1675 * void MoxaPortEnable(int port);
1676 * int port : port number (0 - 127)
1677 *
1678 *
1679 * Function 7: Disable this port
1680 * Syntax:
1681 * void MoxaPortDisable(int port);
1682 * int port : port number (0 - 127)
1683 *
1684 *
1685 * Function 10: Setting baud rate of this port.
1686 * Syntax:
1687 * speed_t MoxaPortSetBaud(int port, speed_t baud);
1688 * int port : port number (0 - 127)
1689 * long baud : baud rate (50 - 115200)
1690 *
1691 * return: 0 : this port is invalid or baud < 50
1692 * 50 - 115200 : the real baud rate set to the port, if
1693 * the argument baud is large than maximun
1694 * available baud rate, the real setting
1695 * baud rate will be the maximun baud rate.
1696 *
1697 *
1698 * Function 12: Configure the port.
1699 * Syntax:
1700 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1701 * int port : port number (0 - 127)
1702 * struct ktermios * termio : termio structure pointer
1703 * speed_t baud : baud rate
1704 *
1705 * return: -1 : this port is invalid or termio == NULL
1706 * 0 : setting O.K.
1707 *
1708 *
1709 * Function 13: Get the DTR/RTS state of this port.
1710 * Syntax:
1711 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1712 * int port : port number (0 - 127)
1713 * int * dtrState : pointer to INT to receive the current DTR
1714 * state. (if NULL, this function will not
1715 * write to this address)
1716 * int * rtsState : pointer to INT to receive the current RTS
1717 * state. (if NULL, this function will not
1718 * write to this address)
1719 *
1720 * return: -1 : this port is invalid
1721 * 0 : O.K.
1722 *
1723 *
1724 * Function 14: Setting the DTR/RTS output state of this port.
1725 * Syntax:
1726 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1727 * int port : port number (0 - 127)
1728 * int dtrState : DTR output state (0: off, 1: on)
1729 * int rtsState : RTS output state (0: off, 1: on)
1730 *
1731 *
1732 * Function 15: Setting the flow control of this port.
1733 * Syntax:
1734 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1735 * int txFlow,int xany);
1736 * int port : port number (0 - 127)
1737 * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1738 * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1739 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1740 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1741 * int xany : S/W XANY flow control (0: no, 1: yes)
1742 *
1743 *
1744 * Function 16: Get ths line status of this port
1745 * Syntax:
1746 * int MoxaPortLineStatus(int port);
1747 * int port : port number (0 - 127)
1748 *
1749 * return: Bit 0 - CTS state (0: off, 1: on)
1750 * Bit 1 - DSR state (0: off, 1: on)
1751 * Bit 2 - DCD state (0: off, 1: on)
1752 *
1753 *
1754 * Function 19: Flush the Rx/Tx buffer data of this port.
1755 * Syntax:
1756 * void MoxaPortFlushData(int port, int mode);
1757 * int port : port number (0 - 127)
1758 * int mode
1759 * 0 : flush the Rx buffer
1760 * 1 : flush the Tx buffer
1761 * 2 : flush the Rx and Tx buffer
1762 *
1763 *
1764 * Function 20: Write data.
1765 * Syntax:
1766 * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1767 * int port : port number (0 - 127)
1768 * unsigned char * buffer : pointer to write data buffer.
1769 * int length : write data length
1770 *
1771 * return: 0 - length : real write data length
1772 *
1773 *
1774 * Function 21: Read data.
1775 * Syntax:
1776 * int MoxaPortReadData(int port, struct tty_struct *tty);
1777 * int port : port number (0 - 127)
1778 * struct tty_struct *tty : tty for data
1779 *
1780 * return: 0 - length : real read data length
1781 *
1782 *
1783 * Function 24: Get the Tx buffer current queued data bytes
1784 * Syntax:
1785 * int MoxaPortTxQueue(int port);
1786 * int port : port number (0 - 127)
1787 *
1788 * return: .. : Tx buffer current queued data bytes
1789 *
1790 *
1791 * Function 25: Get the Tx buffer current free space
1792 * Syntax:
1793 * int MoxaPortTxFree(int port);
1794 * int port : port number (0 - 127)
1795 *
1796 * return: .. : Tx buffer current free space
1797 *
1798 *
1799 * Function 26: Get the Rx buffer current queued data bytes
1800 * Syntax:
1801 * int MoxaPortRxQueue(int port);
1802 * int port : port number (0 - 127)
1803 *
1804 * return: .. : Rx buffer current queued data bytes
1805 *
1806 *
1807 * Function 28: Disable port data transmission.
1808 * Syntax:
1809 * void MoxaPortTxDisable(int port);
1810 * int port : port number (0 - 127)
1811 *
1812 *
1813 * Function 29: Enable port data transmission.
1814 * Syntax:
1815 * void MoxaPortTxEnable(int port);
1816 * int port : port number (0 - 127)
1817 *
1818 *
1819 * Function 31: Get the received BREAK signal count and reset it.
1820 * Syntax:
1821 * int MoxaPortResetBrkCnt(int port);
1822 * int port : port number (0 - 127)
1823 *
1824 * return: 0 - .. : BREAK signal count
1825 *
1826 *
1827 */
1828
1829static void MoxaPortEnable(struct moxa_port *port)
1830{
1831 void __iomem *ofsAddr;
1832 u16 lowwater = 512;
1833
1834 ofsAddr = port->tableAddr;
1835 writew(lowwater, ofsAddr + Low_water);
1836 if (MOXA_IS_320(port->board))
1837 moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1838 else
1839 writew(readw(ofsAddr + HostStat) | WakeupBreak,
1840 ofsAddr + HostStat);
1841
1842 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1843 moxafunc(ofsAddr, FC_FlushQueue, 2);
1844
1845 moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1846 MoxaPortLineStatus(port);
1847}
1848
1849static void MoxaPortDisable(struct moxa_port *port)
1850{
1851 void __iomem *ofsAddr = port->tableAddr;
1852
1853 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1854 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1855 writew(0, ofsAddr + HostStat);
1856 moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1857}
1858
1859static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1860{
1861 void __iomem *ofsAddr = port->tableAddr;
1862 unsigned int clock, val;
1863 speed_t max;
1864
1865 max = MOXA_IS_320(port->board) ? 460800 : 921600;
1866 if (baud < 50)
1867 return 0;
1868 if (baud > max)
1869 baud = max;
1870 clock = 921600;
1871 val = clock / baud;
1872 moxafunc(ofsAddr, FC_SetBaud, val);
1873 baud = clock / val;
1874 return baud;
1875}
1876
1877static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1878 speed_t baud)
1879{
1880 void __iomem *ofsAddr;
1881 tcflag_t cflag;
1882 tcflag_t mode = 0;
1883
1884 ofsAddr = port->tableAddr;
1885 cflag = termio->c_cflag; /* termio->c_cflag */
1886
1887 mode = termio->c_cflag & CSIZE;
1888 if (mode == CS5)
1889 mode = MX_CS5;
1890 else if (mode == CS6)
1891 mode = MX_CS6;
1892 else if (mode == CS7)
1893 mode = MX_CS7;
1894 else if (mode == CS8)
1895 mode = MX_CS8;
1896
1897 if (termio->c_cflag & CSTOPB) {
1898 if (mode == MX_CS5)
1899 mode |= MX_STOP15;
1900 else
1901 mode |= MX_STOP2;
1902 } else
1903 mode |= MX_STOP1;
1904
1905 if (termio->c_cflag & PARENB) {
1906 if (termio->c_cflag & PARODD)
1907 mode |= MX_PARODD;
1908 else
1909 mode |= MX_PAREVEN;
1910 } else
1911 mode |= MX_PARNONE;
1912
1913 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1914
1915 if (MOXA_IS_320(port->board) && baud >= 921600)
1916 return -1;
1917
1918 baud = MoxaPortSetBaud(port, baud);
1919
1920 if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1921 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1922 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1923 writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1924 moxa_wait_finish(ofsAddr);
1925
1926 }
1927 return baud;
1928}
1929
1930static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1931 int *rtsState)
1932{
1933 if (dtrState)
1934 *dtrState = !!(port->lineCtrl & DTR_ON);
1935 if (rtsState)
1936 *rtsState = !!(port->lineCtrl & RTS_ON);
1937
1938 return 0;
1939}
1940
1941static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1942{
1943 u8 mode = 0;
1944
1945 if (dtr)
1946 mode |= DTR_ON;
1947 if (rts)
1948 mode |= RTS_ON;
1949 port->lineCtrl = mode;
1950 moxafunc(port->tableAddr, FC_LineControl, mode);
1951}
1952
1953static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1954 int txflow, int rxflow, int txany)
1955{
1956 int mode = 0;
1957
1958 if (rts)
1959 mode |= RTS_FlowCtl;
1960 if (cts)
1961 mode |= CTS_FlowCtl;
1962 if (txflow)
1963 mode |= Tx_FlowCtl;
1964 if (rxflow)
1965 mode |= Rx_FlowCtl;
1966 if (txany)
1967 mode |= IXM_IXANY;
1968 moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1969}
1970
1971static int MoxaPortLineStatus(struct moxa_port *port)
1972{
1973 void __iomem *ofsAddr;
1974 int val;
1975
1976 ofsAddr = port->tableAddr;
1977 if (MOXA_IS_320(port->board)) {
1978 moxafunc(ofsAddr, FC_LineStatus, 0);
1979 val = readw(ofsAddr + FuncArg);
1980 } else {
1981 val = readw(ofsAddr + FlagStat) >> 4;
1982 }
1983 val &= 0x0B;
1984 if (val & 8)
1985 val |= 4;
1986 spin_lock_bh(&moxa_lock);
1987 moxa_new_dcdstate(port, val & 8);
1988 spin_unlock_bh(&moxa_lock);
1989 val &= 7;
1990 return val;
1991}
1992
1993static int MoxaPortWriteData(struct tty_struct *tty,
1994 const unsigned char *buffer, int len)
1995{
1996 struct moxa_port *port = tty->driver_data;
1997 void __iomem *baseAddr, *ofsAddr, *ofs;
1998 unsigned int c, total;
1999 u16 head, tail, tx_mask, spage, epage;
2000 u16 pageno, pageofs, bufhead;
2001
2002 ofsAddr = port->tableAddr;
2003 baseAddr = port->board->basemem;
2004 tx_mask = readw(ofsAddr + TX_mask);
2005 spage = readw(ofsAddr + Page_txb);
2006 epage = readw(ofsAddr + EndPage_txb);
2007 tail = readw(ofsAddr + TXwptr);
2008 head = readw(ofsAddr + TXrptr);
2009 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
2010 if (c > len)
2011 c = len;
2012 moxaLog.txcnt[port->port.tty->index] += c;
2013 total = c;
2014 if (spage == epage) {
2015 bufhead = readw(ofsAddr + Ofs_txb);
2016 writew(spage, baseAddr + Control_reg);
2017 while (c > 0) {
2018 if (head > tail)
2019 len = head - tail - 1;
2020 else
2021 len = tx_mask + 1 - tail;
2022 len = (c > len) ? len : c;
2023 ofs = baseAddr + DynPage_addr + bufhead + tail;
2024 memcpy_toio(ofs, buffer, len);
2025 buffer += len;
2026 tail = (tail + len) & tx_mask;
2027 c -= len;
2028 }
2029 } else {
2030 pageno = spage + (tail >> 13);
2031 pageofs = tail & Page_mask;
2032 while (c > 0) {
2033 len = Page_size - pageofs;
2034 if (len > c)
2035 len = c;
2036 writeb(pageno, baseAddr + Control_reg);
2037 ofs = baseAddr + DynPage_addr + pageofs;
2038 memcpy_toio(ofs, buffer, len);
2039 buffer += len;
2040 if (++pageno == epage)
2041 pageno = spage;
2042 pageofs = 0;
2043 c -= len;
2044 }
2045 tail = (tail + total) & tx_mask;
2046 }
2047 writew(tail, ofsAddr + TXwptr);
2048 writeb(1, ofsAddr + CD180TXirq); /* start to send */
2049 return total;
2050}
2051
2052static int MoxaPortReadData(struct moxa_port *port)
2053{
2054 struct tty_struct *tty = port->port.tty;
2055 unsigned char *dst;
2056 void __iomem *baseAddr, *ofsAddr, *ofs;
2057 unsigned int count, len, total;
2058 u16 tail, rx_mask, spage, epage;
2059 u16 pageno, pageofs, bufhead, head;
2060
2061 ofsAddr = port->tableAddr;
2062 baseAddr = port->board->basemem;
2063 head = readw(ofsAddr + RXrptr);
2064 tail = readw(ofsAddr + RXwptr);
2065 rx_mask = readw(ofsAddr + RX_mask);
2066 spage = readw(ofsAddr + Page_rxb);
2067 epage = readw(ofsAddr + EndPage_rxb);
2068 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
2069 if (count == 0)
2070 return 0;
2071
2072 total = count;
2073 moxaLog.rxcnt[tty->index] += total;
2074 if (spage == epage) {
2075 bufhead = readw(ofsAddr + Ofs_rxb);
2076 writew(spage, baseAddr + Control_reg);
2077 while (count > 0) {
2078 ofs = baseAddr + DynPage_addr + bufhead + head;
2079 len = (tail >= head) ? (tail - head) :
2080 (rx_mask + 1 - head);
2081 len = tty_prepare_flip_string(tty, &dst,
2082 min(len, count));
2083 memcpy_fromio(dst, ofs, len);
2084 head = (head + len) & rx_mask;
2085 count -= len;
2086 }
2087 } else {
2088 pageno = spage + (head >> 13);
2089 pageofs = head & Page_mask;
2090 while (count > 0) {
2091 writew(pageno, baseAddr + Control_reg);
2092 ofs = baseAddr + DynPage_addr + pageofs;
2093 len = tty_prepare_flip_string(tty, &dst,
2094 min(Page_size - pageofs, count));
2095 memcpy_fromio(dst, ofs, len);
2096
2097 count -= len;
2098 pageofs = (pageofs + len) & Page_mask;
2099 if (pageofs == 0 && ++pageno == epage)
2100 pageno = spage;
2101 }
2102 head = (head + total) & rx_mask;
2103 }
2104 writew(head, ofsAddr + RXrptr);
2105 if (readb(ofsAddr + FlagStat) & Xoff_state) {
2106 moxaLowWaterChk = 1;
2107 port->lowChkFlag = 1;
2108 }
2109 return total;
2110}
2111
2112
2113static int MoxaPortTxQueue(struct moxa_port *port)
2114{
2115 void __iomem *ofsAddr = port->tableAddr;
2116 u16 rptr, wptr, mask;
2117
2118 rptr = readw(ofsAddr + TXrptr);
2119 wptr = readw(ofsAddr + TXwptr);
2120 mask = readw(ofsAddr + TX_mask);
2121 return (wptr - rptr) & mask;
2122}
2123
2124static int MoxaPortTxFree(struct moxa_port *port)
2125{
2126 void __iomem *ofsAddr = port->tableAddr;
2127 u16 rptr, wptr, mask;
2128
2129 rptr = readw(ofsAddr + TXrptr);
2130 wptr = readw(ofsAddr + TXwptr);
2131 mask = readw(ofsAddr + TX_mask);
2132 return mask - ((wptr - rptr) & mask);
2133}
2134
2135static int MoxaPortRxQueue(struct moxa_port *port)
2136{
2137 void __iomem *ofsAddr = port->tableAddr;
2138 u16 rptr, wptr, mask;
2139
2140 rptr = readw(ofsAddr + RXrptr);
2141 wptr = readw(ofsAddr + RXwptr);
2142 mask = readw(ofsAddr + RX_mask);
2143 return (wptr - rptr) & mask;
2144}
2145
2146static void MoxaPortTxDisable(struct moxa_port *port)
2147{
2148 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2149}
2150
2151static void MoxaPortTxEnable(struct moxa_port *port)
2152{
2153 moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2154}
2155
2156static int moxa_get_serial_info(struct moxa_port *info,
2157 struct serial_struct __user *retinfo)
2158{
2159 struct serial_struct tmp = {
2160 .type = info->type,
2161 .line = info->port.tty->index,
2162 .flags = info->port.flags,
2163 .baud_base = 921600,
2164 .close_delay = info->port.close_delay
2165 };
2166 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2167}
2168
2169
2170static int moxa_set_serial_info(struct moxa_port *info,
2171 struct serial_struct __user *new_info)
2172{
2173 struct serial_struct new_serial;
2174
2175 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2176 return -EFAULT;
2177
2178 if (new_serial.irq != 0 || new_serial.port != 0 ||
2179 new_serial.custom_divisor != 0 ||
2180 new_serial.baud_base != 921600)
2181 return -EPERM;
2182
2183 if (!capable(CAP_SYS_ADMIN)) {
2184 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2185 (info->port.flags & ~ASYNC_USR_MASK)))
2186 return -EPERM;
2187 } else
2188 info->port.close_delay = new_serial.close_delay * HZ / 100;
2189
2190 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2191 new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2192
2193 MoxaSetFifo(info, new_serial.type == PORT_16550A);
2194
2195 info->type = new_serial.type;
2196 return 0;
2197}
2198
2199
2200
2201/*****************************************************************************
2202 * Static local functions: *
2203 *****************************************************************************/
2204
2205static void MoxaSetFifo(struct moxa_port *port, int enable)
2206{
2207 void __iomem *ofsAddr = port->tableAddr;
2208
2209 if (!enable) {
2210 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2211 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2212 } else {
2213 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2214 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2215 }
2216}