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x86, apic: Fix spurious error interrupts triggering on all non-boot APs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / moxa.c
blob63ee3bbc1ce4169654624980c3281e28fe84ae7c
1 /*****************************************************************************/
2 /*
3 * moxa.c -- MOXA Intellio family multiport serial driver.
4 *
5 * Copyright (C) 1999-2000 Moxa Technologies (support@moxa.com).
6 * Copyright (c) 2007 Jiri Slaby <jirislaby@gmail.com>
7 *
8 * This code is loosely based on the Linux serial driver, written by
9 * Linus Torvalds, Theodore T'so and others.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 */
16
17 /*
18 * MOXA Intellio Series Driver
19 * for : LINUX
20 * date : 1999/1/7
21 * version : 5.1
22 */
23
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/mm.h>
27 #include <linux/ioport.h>
28 #include <linux/errno.h>
29 #include <linux/firmware.h>
30 #include <linux/signal.h>
31 #include <linux/sched.h>
32 #include <linux/timer.h>
33 #include <linux/interrupt.h>
34 #include <linux/tty.h>
35 #include <linux/tty_flip.h>
36 #include <linux/major.h>
37 #include <linux/string.h>
38 #include <linux/fcntl.h>
39 #include <linux/ptrace.h>
40 #include <linux/serial.h>
41 #include <linux/tty_driver.h>
42 #include <linux/delay.h>
43 #include <linux/pci.h>
44 #include <linux/init.h>
45 #include <linux/bitops.h>
46
47 #include <asm/system.h>
48 #include <asm/io.h>
49 #include <asm/uaccess.h>
50
51 #include "moxa.h"
52
53 #define MOXA_VERSION "6.0k"
54
55 #define MOXA_FW_HDRLEN 32
56
57 #define MOXAMAJOR 172
58
59 #define MAX_BOARDS 4 /* Don't change this value */
60 #define MAX_PORTS_PER_BOARD 32 /* Don't change this value */
61 #define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD)
62
63 #define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
64 (brd)->boardType == MOXA_BOARD_C320_PCI)
65
66 /*
67 * Define the Moxa PCI vendor and device IDs.
68 */
69 #define MOXA_BUS_TYPE_ISA 0
70 #define MOXA_BUS_TYPE_PCI 1
71
72 enum {
73 MOXA_BOARD_C218_PCI = 1,
74 MOXA_BOARD_C218_ISA,
75 MOXA_BOARD_C320_PCI,
76 MOXA_BOARD_C320_ISA,
77 MOXA_BOARD_CP204J,
78 };
79
80 static char *moxa_brdname[] =
81 {
82 "C218 Turbo PCI series",
83 "C218 Turbo ISA series",
84 "C320 Turbo PCI series",
85 "C320 Turbo ISA series",
86 "CP-204J series",
87 };
88
89 #ifdef CONFIG_PCI
90 static struct pci_device_id moxa_pcibrds[] = {
91 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
92 .driver_data = MOXA_BOARD_C218_PCI },
93 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
94 .driver_data = MOXA_BOARD_C320_PCI },
95 { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
96 .driver_data = MOXA_BOARD_CP204J },
97 { 0 }
98 };
99 MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
100 #endif /* CONFIG_PCI */
101
102 struct moxa_port;
103
104 static struct moxa_board_conf {
105 int boardType;
106 int numPorts;
107 int busType;
108
109 unsigned int ready;
110
111 struct moxa_port *ports;
112
113 void __iomem *basemem;
114 void __iomem *intNdx;
115 void __iomem *intPend;
116 void __iomem *intTable;
117 } moxa_boards[MAX_BOARDS];
118
119 struct mxser_mstatus {
120 tcflag_t cflag;
121 int cts;
122 int dsr;
123 int ri;
124 int dcd;
125 };
126
127 struct moxaq_str {
128 int inq;
129 int outq;
130 };
131
132 struct moxa_port {
133 struct tty_port port;
134 struct moxa_board_conf *board;
135 void __iomem *tableAddr;
136
137 int type;
138 int cflag;
139 unsigned long statusflags;
140
141 u8 DCDState; /* Protected by the port lock */
142 u8 lineCtrl;
143 u8 lowChkFlag;
144 };
145
146 struct mon_str {
147 int tick;
148 int rxcnt[MAX_PORTS];
149 int txcnt[MAX_PORTS];
150 };
151
152 /* statusflags */
153 #define TXSTOPPED 1
154 #define LOWWAIT 2
155 #define EMPTYWAIT 3
156
157 #define SERIAL_DO_RESTART
158
159 #define WAKEUP_CHARS 256
160
161 static int ttymajor = MOXAMAJOR;
162 static struct mon_str moxaLog;
163 static unsigned int moxaFuncTout = HZ / 2;
164 static unsigned int moxaLowWaterChk;
165 static DEFINE_MUTEX(moxa_openlock);
166 static DEFINE_SPINLOCK(moxa_lock);
167 /* Variables for insmod */
168 #ifdef MODULE
169 static unsigned long baseaddr[MAX_BOARDS];
170 static unsigned int type[MAX_BOARDS];
171 static unsigned int numports[MAX_BOARDS];
172 #endif
173
174 MODULE_AUTHOR("William Chen");
175 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
176 MODULE_LICENSE("GPL");
177 #ifdef MODULE
178 module_param_array(type, uint, NULL, 0);
179 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
180 module_param_array(baseaddr, ulong, NULL, 0);
181 MODULE_PARM_DESC(baseaddr, "base address");
182 module_param_array(numports, uint, NULL, 0);
183 MODULE_PARM_DESC(numports, "numports (ignored for C218)");
184 #endif
185 module_param(ttymajor, int, 0);
186
187 /*
188 * static functions:
189 */
190 static int moxa_open(struct tty_struct *, struct file *);
191 static void moxa_close(struct tty_struct *, struct file *);
192 static int moxa_write(struct tty_struct *, const unsigned char *, int);
193 static int moxa_write_room(struct tty_struct *);
194 static void moxa_flush_buffer(struct tty_struct *);
195 static int moxa_chars_in_buffer(struct tty_struct *);
196 static void moxa_set_termios(struct tty_struct *, struct ktermios *);
197 static void moxa_stop(struct tty_struct *);
198 static void moxa_start(struct tty_struct *);
199 static void moxa_hangup(struct tty_struct *);
200 static int moxa_tiocmget(struct tty_struct *tty, struct file *file);
201 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
202 unsigned int set, unsigned int clear);
203 static void moxa_poll(unsigned long);
204 static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
205 static void moxa_shutdown(struct tty_port *);
206 static int moxa_carrier_raised(struct tty_port *);
207 static void moxa_dtr_rts(struct tty_port *, int);
208 /*
209 * moxa board interface functions:
210 */
211 static void MoxaPortEnable(struct moxa_port *);
212 static void MoxaPortDisable(struct moxa_port *);
213 static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
214 static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
215 static void MoxaPortLineCtrl(struct moxa_port *, int, int);
216 static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
217 static int MoxaPortLineStatus(struct moxa_port *);
218 static void MoxaPortFlushData(struct moxa_port *, int);
219 static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
220 static int MoxaPortReadData(struct moxa_port *);
221 static int MoxaPortTxQueue(struct moxa_port *);
222 static int MoxaPortRxQueue(struct moxa_port *);
223 static int MoxaPortTxFree(struct moxa_port *);
224 static void MoxaPortTxDisable(struct moxa_port *);
225 static void MoxaPortTxEnable(struct moxa_port *);
226 static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
227 static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
228 static void MoxaSetFifo(struct moxa_port *port, int enable);
229
230 /*
231 * I/O functions
232 */
233
234 static DEFINE_SPINLOCK(moxafunc_lock);
235
236 static void moxa_wait_finish(void __iomem *ofsAddr)
237 {
238 unsigned long end = jiffies + moxaFuncTout;
239
240 while (readw(ofsAddr + FuncCode) != 0)
241 if (time_after(jiffies, end))
242 return;
243 if (readw(ofsAddr + FuncCode) != 0 && printk_ratelimit())
244 printk(KERN_WARNING "moxa function expired\n");
245 }
246
247 static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
248 {
249 unsigned long flags;
250 spin_lock_irqsave(&moxafunc_lock, flags);
251 writew(arg, ofsAddr + FuncArg);
252 writew(cmd, ofsAddr + FuncCode);
253 moxa_wait_finish(ofsAddr);
254 spin_unlock_irqrestore(&moxafunc_lock, flags);
255 }
256
257 static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
258 {
259 unsigned long flags;
260 u16 ret;
261 spin_lock_irqsave(&moxafunc_lock, flags);
262 writew(arg, ofsAddr + FuncArg);
263 writew(cmd, ofsAddr + FuncCode);
264 moxa_wait_finish(ofsAddr);
265 ret = readw(ofsAddr + FuncArg);
266 spin_unlock_irqrestore(&moxafunc_lock, flags);
267 return ret;
268 }
269
270 static void moxa_low_water_check(void __iomem *ofsAddr)
271 {
272 u16 rptr, wptr, mask, len;
273
274 if (readb(ofsAddr + FlagStat) & Xoff_state) {
275 rptr = readw(ofsAddr + RXrptr);
276 wptr = readw(ofsAddr + RXwptr);
277 mask = readw(ofsAddr + RX_mask);
278 len = (wptr - rptr) & mask;
279 if (len <= Low_water)
280 moxafunc(ofsAddr, FC_SendXon, 0);
281 }
282 }
283
284 /*
285 * TTY operations
286 */
287
288 static int moxa_ioctl(struct tty_struct *tty, struct file *file,
289 unsigned int cmd, unsigned long arg)
290 {
291 struct moxa_port *ch = tty->driver_data;
292 void __user *argp = (void __user *)arg;
293 int status, ret = 0;
294
295 if (tty->index == MAX_PORTS) {
296 if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
297 cmd != MOXA_GETMSTATUS)
298 return -EINVAL;
299 } else if (!ch)
300 return -ENODEV;
301
302 switch (cmd) {
303 case MOXA_GETDATACOUNT:
304 moxaLog.tick = jiffies;
305 if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
306 ret = -EFAULT;
307 break;
308 case MOXA_FLUSH_QUEUE:
309 MoxaPortFlushData(ch, arg);
310 break;
311 case MOXA_GET_IOQUEUE: {
312 struct moxaq_str __user *argm = argp;
313 struct moxaq_str tmp;
314 struct moxa_port *p;
315 unsigned int i, j;
316
317 for (i = 0; i < MAX_BOARDS; i++) {
318 p = moxa_boards[i].ports;
319 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
320 memset(&tmp, 0, sizeof(tmp));
321 spin_lock_bh(&moxa_lock);
322 if (moxa_boards[i].ready) {
323 tmp.inq = MoxaPortRxQueue(p);
324 tmp.outq = MoxaPortTxQueue(p);
325 }
326 spin_unlock_bh(&moxa_lock);
327 if (copy_to_user(argm, &tmp, sizeof(tmp)))
328 return -EFAULT;
329 }
330 }
331 break;
332 } case MOXA_GET_OQUEUE:
333 status = MoxaPortTxQueue(ch);
334 ret = put_user(status, (unsigned long __user *)argp);
335 break;
336 case MOXA_GET_IQUEUE:
337 status = MoxaPortRxQueue(ch);
338 ret = put_user(status, (unsigned long __user *)argp);
339 break;
340 case MOXA_GETMSTATUS: {
341 struct mxser_mstatus __user *argm = argp;
342 struct mxser_mstatus tmp;
343 struct moxa_port *p;
344 unsigned int i, j;
345
346 for (i = 0; i < MAX_BOARDS; i++) {
347 p = moxa_boards[i].ports;
348 for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
349 struct tty_struct *ttyp;
350 memset(&tmp, 0, sizeof(tmp));
351 spin_lock_bh(&moxa_lock);
352 if (!moxa_boards[i].ready) {
353 spin_unlock_bh(&moxa_lock);
354 goto copy;
355 }
356
357 status = MoxaPortLineStatus(p);
358 spin_unlock_bh(&moxa_lock);
359
360 if (status & 1)
361 tmp.cts = 1;
362 if (status & 2)
363 tmp.dsr = 1;
364 if (status & 4)
365 tmp.dcd = 1;
366
367 ttyp = tty_port_tty_get(&p->port);
368 if (!ttyp || !ttyp->termios)
369 tmp.cflag = p->cflag;
370 else
371 tmp.cflag = ttyp->termios->c_cflag;
372 tty_kref_put(tty);
373 copy:
374 if (copy_to_user(argm, &tmp, sizeof(tmp)))
375 return -EFAULT;
376 }
377 }
378 break;
379 }
380 case TIOCGSERIAL:
381 mutex_lock(&ch->port.mutex);
382 ret = moxa_get_serial_info(ch, argp);
383 mutex_unlock(&ch->port.mutex);
384 break;
385 case TIOCSSERIAL:
386 mutex_lock(&ch->port.mutex);
387 ret = moxa_set_serial_info(ch, argp);
388 mutex_unlock(&ch->port.mutex);
389 break;
390 default:
391 ret = -ENOIOCTLCMD;
392 }
393 return ret;
394 }
395
396 static int moxa_break_ctl(struct tty_struct *tty, int state)
397 {
398 struct moxa_port *port = tty->driver_data;
399
400 moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
401 Magic_code);
402 return 0;
403 }
404
405 static const struct tty_operations moxa_ops = {
406 .open = moxa_open,
407 .close = moxa_close,
408 .write = moxa_write,
409 .write_room = moxa_write_room,
410 .flush_buffer = moxa_flush_buffer,
411 .chars_in_buffer = moxa_chars_in_buffer,
412 .ioctl = moxa_ioctl,
413 .set_termios = moxa_set_termios,
414 .stop = moxa_stop,
415 .start = moxa_start,
416 .hangup = moxa_hangup,
417 .break_ctl = moxa_break_ctl,
418 .tiocmget = moxa_tiocmget,
419 .tiocmset = moxa_tiocmset,
420 };
421
422 static const struct tty_port_operations moxa_port_ops = {
423 .carrier_raised = moxa_carrier_raised,
424 .dtr_rts = moxa_dtr_rts,
425 .shutdown = moxa_shutdown,
426 };
427
428 static struct tty_driver *moxaDriver;
429 static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
430
431 /*
432 * HW init
433 */
434
435 static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
436 {
437 switch (brd->boardType) {
438 case MOXA_BOARD_C218_ISA:
439 case MOXA_BOARD_C218_PCI:
440 if (model != 1)
441 goto err;
442 break;
443 case MOXA_BOARD_CP204J:
444 if (model != 3)
445 goto err;
446 break;
447 default:
448 if (model != 2)
449 goto err;
450 break;
451 }
452 return 0;
453 err:
454 return -EINVAL;
455 }
456
457 static int moxa_check_fw(const void *ptr)
458 {
459 const __le16 *lptr = ptr;
460
461 if (*lptr != cpu_to_le16(0x7980))
462 return -EINVAL;
463
464 return 0;
465 }
466
467 static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
468 size_t len)
469 {
470 void __iomem *baseAddr = brd->basemem;
471 u16 tmp;
472
473 writeb(HW_reset, baseAddr + Control_reg); /* reset */
474 msleep(10);
475 memset_io(baseAddr, 0, 4096);
476 memcpy_toio(baseAddr, buf, len); /* download BIOS */
477 writeb(0, baseAddr + Control_reg); /* restart */
478
479 msleep(2000);
480
481 switch (brd->boardType) {
482 case MOXA_BOARD_C218_ISA:
483 case MOXA_BOARD_C218_PCI:
484 tmp = readw(baseAddr + C218_key);
485 if (tmp != C218_KeyCode)
486 goto err;
487 break;
488 case MOXA_BOARD_CP204J:
489 tmp = readw(baseAddr + C218_key);
490 if (tmp != CP204J_KeyCode)
491 goto err;
492 break;
493 default:
494 tmp = readw(baseAddr + C320_key);
495 if (tmp != C320_KeyCode)
496 goto err;
497 tmp = readw(baseAddr + C320_status);
498 if (tmp != STS_init) {
499 printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
500 "module not found\n");
501 return -EIO;
502 }
503 break;
504 }
505
506 return 0;
507 err:
508 printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
509 return -EIO;
510 }
511
512 static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
513 size_t len)
514 {
515 void __iomem *baseAddr = brd->basemem;
516
517 if (len < 7168) {
518 printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
519 return -EINVAL;
520 }
521
522 writew(len - 7168 - 2, baseAddr + C320bapi_len);
523 writeb(1, baseAddr + Control_reg); /* Select Page 1 */
524 memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
525 writeb(2, baseAddr + Control_reg); /* Select Page 2 */
526 memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
527
528 return 0;
529 }
530
531 static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
532 size_t len)
533 {
534 void __iomem *baseAddr = brd->basemem;
535 const __le16 *uptr = ptr;
536 size_t wlen, len2, j;
537 unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
538 unsigned int i, retry;
539 u16 usum, keycode;
540
541 keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
542 C218_KeyCode;
543
544 switch (brd->boardType) {
545 case MOXA_BOARD_CP204J:
546 case MOXA_BOARD_C218_ISA:
547 case MOXA_BOARD_C218_PCI:
548 key = C218_key;
549 loadbuf = C218_LoadBuf;
550 loadlen = C218DLoad_len;
551 checksum = C218check_sum;
552 checksum_ok = C218chksum_ok;
553 break;
554 default:
555 key = C320_key;
556 keycode = C320_KeyCode;
557 loadbuf = C320_LoadBuf;
558 loadlen = C320DLoad_len;
559 checksum = C320check_sum;
560 checksum_ok = C320chksum_ok;
561 break;
562 }
563
564 usum = 0;
565 wlen = len >> 1;
566 for (i = 0; i < wlen; i++)
567 usum += le16_to_cpu(uptr[i]);
568 retry = 0;
569 do {
570 wlen = len >> 1;
571 j = 0;
572 while (wlen) {
573 len2 = (wlen > 2048) ? 2048 : wlen;
574 wlen -= len2;
575 memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
576 j += len2 << 1;
577
578 writew(len2, baseAddr + loadlen);
579 writew(0, baseAddr + key);
580 for (i = 0; i < 100; i++) {
581 if (readw(baseAddr + key) == keycode)
582 break;
583 msleep(10);
584 }
585 if (readw(baseAddr + key) != keycode)
586 return -EIO;
587 }
588 writew(0, baseAddr + loadlen);
589 writew(usum, baseAddr + checksum);
590 writew(0, baseAddr + key);
591 for (i = 0; i < 100; i++) {
592 if (readw(baseAddr + key) == keycode)
593 break;
594 msleep(10);
595 }
596 retry++;
597 } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
598 if (readb(baseAddr + checksum_ok) != 1)
599 return -EIO;
600
601 writew(0, baseAddr + key);
602 for (i = 0; i < 600; i++) {
603 if (readw(baseAddr + Magic_no) == Magic_code)
604 break;
605 msleep(10);
606 }
607 if (readw(baseAddr + Magic_no) != Magic_code)
608 return -EIO;
609
610 if (MOXA_IS_320(brd)) {
611 if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */
612 writew(0x3800, baseAddr + TMS320_PORT1);
613 writew(0x3900, baseAddr + TMS320_PORT2);
614 writew(28499, baseAddr + TMS320_CLOCK);
615 } else {
616 writew(0x3200, baseAddr + TMS320_PORT1);
617 writew(0x3400, baseAddr + TMS320_PORT2);
618 writew(19999, baseAddr + TMS320_CLOCK);
619 }
620 }
621 writew(1, baseAddr + Disable_IRQ);
622 writew(0, baseAddr + Magic_no);
623 for (i = 0; i < 500; i++) {
624 if (readw(baseAddr + Magic_no) == Magic_code)
625 break;
626 msleep(10);
627 }
628 if (readw(baseAddr + Magic_no) != Magic_code)
629 return -EIO;
630
631 if (MOXA_IS_320(brd)) {
632 j = readw(baseAddr + Module_cnt);
633 if (j <= 0)
634 return -EIO;
635 brd->numPorts = j * 8;
636 writew(j, baseAddr + Module_no);
637 writew(0, baseAddr + Magic_no);
638 for (i = 0; i < 600; i++) {
639 if (readw(baseAddr + Magic_no) == Magic_code)
640 break;
641 msleep(10);
642 }
643 if (readw(baseAddr + Magic_no) != Magic_code)
644 return -EIO;
645 }
646 brd->intNdx = baseAddr + IRQindex;
647 brd->intPend = baseAddr + IRQpending;
648 brd->intTable = baseAddr + IRQtable;
649
650 return 0;
651 }
652
653 static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
654 size_t len)
655 {
656 void __iomem *ofsAddr, *baseAddr = brd->basemem;
657 struct moxa_port *port;
658 int retval, i;
659
660 if (len % 2) {
661 printk(KERN_ERR "MOXA: bios length is not even\n");
662 return -EINVAL;
663 }
664
665 retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
666 if (retval)
667 return retval;
668
669 switch (brd->boardType) {
670 case MOXA_BOARD_C218_ISA:
671 case MOXA_BOARD_C218_PCI:
672 case MOXA_BOARD_CP204J:
673 port = brd->ports;
674 for (i = 0; i < brd->numPorts; i++, port++) {
675 port->board = brd;
676 port->DCDState = 0;
677 port->tableAddr = baseAddr + Extern_table +
678 Extern_size * i;
679 ofsAddr = port->tableAddr;
680 writew(C218rx_mask, ofsAddr + RX_mask);
681 writew(C218tx_mask, ofsAddr + TX_mask);
682 writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
683 writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
684
685 writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
686 writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
687
688 }
689 break;
690 default:
691 port = brd->ports;
692 for (i = 0; i < brd->numPorts; i++, port++) {
693 port->board = brd;
694 port->DCDState = 0;
695 port->tableAddr = baseAddr + Extern_table +
696 Extern_size * i;
697 ofsAddr = port->tableAddr;
698 switch (brd->numPorts) {
699 case 8:
700 writew(C320p8rx_mask, ofsAddr + RX_mask);
701 writew(C320p8tx_mask, ofsAddr + TX_mask);
702 writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
703 writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
704 writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
705 writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
706
707 break;
708 case 16:
709 writew(C320p16rx_mask, ofsAddr + RX_mask);
710 writew(C320p16tx_mask, ofsAddr + TX_mask);
711 writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
712 writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
713 writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
714 writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
715 break;
716
717 case 24:
718 writew(C320p24rx_mask, ofsAddr + RX_mask);
719 writew(C320p24tx_mask, ofsAddr + TX_mask);
720 writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
721 writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
722 writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
723 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
724 break;
725 case 32:
726 writew(C320p32rx_mask, ofsAddr + RX_mask);
727 writew(C320p32tx_mask, ofsAddr + TX_mask);
728 writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
729 writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
730 writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
731 writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
732 writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
733 break;
734 }
735 }
736 break;
737 }
738 return 0;
739 }
740
741 static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
742 {
743 const void *ptr = fw->data;
744 char rsn[64];
745 u16 lens[5];
746 size_t len;
747 unsigned int a, lenp, lencnt;
748 int ret = -EINVAL;
749 struct {
750 __le32 magic; /* 0x34303430 */
751 u8 reserved1[2];
752 u8 type; /* UNIX = 3 */
753 u8 model; /* C218T=1, C320T=2, CP204=3 */
754 u8 reserved2[8];
755 __le16 len[5];
756 } const *hdr = ptr;
757
758 BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
759
760 if (fw->size < MOXA_FW_HDRLEN) {
761 strcpy(rsn, "too short (even header won't fit)");
762 goto err;
763 }
764 if (hdr->magic != cpu_to_le32(0x30343034)) {
765 sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
766 goto err;
767 }
768 if (hdr->type != 3) {
769 sprintf(rsn, "not for linux, type is %u", hdr->type);
770 goto err;
771 }
772 if (moxa_check_fw_model(brd, hdr->model)) {
773 sprintf(rsn, "not for this card, model is %u", hdr->model);
774 goto err;
775 }
776
777 len = MOXA_FW_HDRLEN;
778 lencnt = hdr->model == 2 ? 5 : 3;
779 for (a = 0; a < ARRAY_SIZE(lens); a++) {
780 lens[a] = le16_to_cpu(hdr->len[a]);
781 if (lens[a] && len + lens[a] <= fw->size &&
782 moxa_check_fw(&fw->data[len]))
783 printk(KERN_WARNING "MOXA firmware: unexpected input "
784 "at offset %u, but going on\n", (u32)len);
785 if (!lens[a] && a < lencnt) {
786 sprintf(rsn, "too few entries in fw file");
787 goto err;
788 }
789 len += lens[a];
790 }
791
792 if (len != fw->size) {
793 sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
794 (u32)len);
795 goto err;
796 }
797
798 ptr += MOXA_FW_HDRLEN;
799 lenp = 0; /* bios */
800
801 strcpy(rsn, "read above");
802
803 ret = moxa_load_bios(brd, ptr, lens[lenp]);
804 if (ret)
805 goto err;
806
807 /* we skip the tty section (lens[1]), since we don't need it */
808 ptr += lens[lenp] + lens[lenp + 1];
809 lenp += 2; /* comm */
810
811 if (hdr->model == 2) {
812 ret = moxa_load_320b(brd, ptr, lens[lenp]);
813 if (ret)
814 goto err;
815 /* skip another tty */
816 ptr += lens[lenp] + lens[lenp + 1];
817 lenp += 2;
818 }
819
820 ret = moxa_load_code(brd, ptr, lens[lenp]);
821 if (ret)
822 goto err;
823
824 return 0;
825 err:
826 printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
827 return ret;
828 }
829
830 static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
831 {
832 const struct firmware *fw;
833 const char *file;
834 struct moxa_port *p;
835 unsigned int i;
836 int ret;
837
838 brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
839 GFP_KERNEL);
840 if (brd->ports == NULL) {
841 printk(KERN_ERR "cannot allocate memory for ports\n");
842 ret = -ENOMEM;
843 goto err;
844 }
845
846 for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
847 tty_port_init(&p->port);
848 p->port.ops = &moxa_port_ops;
849 p->type = PORT_16550A;
850 p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
851 }
852
853 switch (brd->boardType) {
854 case MOXA_BOARD_C218_ISA:
855 case MOXA_BOARD_C218_PCI:
856 file = "c218tunx.cod";
857 break;
858 case MOXA_BOARD_CP204J:
859 file = "cp204unx.cod";
860 break;
861 default:
862 file = "c320tunx.cod";
863 break;
864 }
865
866 ret = request_firmware(&fw, file, dev);
867 if (ret) {
868 printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
869 "you've placed '%s' file into your firmware "
870 "loader directory (e.g. /lib/firmware)\n",
871 file);
872 goto err_free;
873 }
874
875 ret = moxa_load_fw(brd, fw);
876
877 release_firmware(fw);
878
879 if (ret)
880 goto err_free;
881
882 spin_lock_bh(&moxa_lock);
883 brd->ready = 1;
884 if (!timer_pending(&moxaTimer))
885 mod_timer(&moxaTimer, jiffies + HZ / 50);
886 spin_unlock_bh(&moxa_lock);
887
888 return 0;
889 err_free:
890 kfree(brd->ports);
891 err:
892 return ret;
893 }
894
895 static void moxa_board_deinit(struct moxa_board_conf *brd)
896 {
897 unsigned int a, opened;
898
899 mutex_lock(&moxa_openlock);
900 spin_lock_bh(&moxa_lock);
901 brd->ready = 0;
902 spin_unlock_bh(&moxa_lock);
903
904 /* pci hot-un-plug support */
905 for (a = 0; a < brd->numPorts; a++)
906 if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
907 struct tty_struct *tty = tty_port_tty_get(
908 &brd->ports[a].port);
909 if (tty) {
910 tty_hangup(tty);
911 tty_kref_put(tty);
912 }
913 }
914 while (1) {
915 opened = 0;
916 for (a = 0; a < brd->numPorts; a++)
917 if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
918 opened++;
919 mutex_unlock(&moxa_openlock);
920 if (!opened)
921 break;
922 msleep(50);
923 mutex_lock(&moxa_openlock);
924 }
925
926 iounmap(brd->basemem);
927 brd->basemem = NULL;
928 kfree(brd->ports);
929 }
930
931 #ifdef CONFIG_PCI
932 static int __devinit moxa_pci_probe(struct pci_dev *pdev,
933 const struct pci_device_id *ent)
934 {
935 struct moxa_board_conf *board;
936 unsigned int i;
937 int board_type = ent->driver_data;
938 int retval;
939
940 retval = pci_enable_device(pdev);
941 if (retval) {
942 dev_err(&pdev->dev, "can't enable pci device\n");
943 goto err;
944 }
945
946 for (i = 0; i < MAX_BOARDS; i++)
947 if (moxa_boards[i].basemem == NULL)
948 break;
949
950 retval = -ENODEV;
951 if (i >= MAX_BOARDS) {
952 dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
953 "found. Board is ignored.\n", MAX_BOARDS);
954 goto err;
955 }
956
957 board = &moxa_boards[i];
958
959 retval = pci_request_region(pdev, 2, "moxa-base");
960 if (retval) {
961 dev_err(&pdev->dev, "can't request pci region 2\n");
962 goto err;
963 }
964
965 board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
966 if (board->basemem == NULL) {
967 dev_err(&pdev->dev, "can't remap io space 2\n");
968 goto err_reg;
969 }
970
971 board->boardType = board_type;
972 switch (board_type) {
973 case MOXA_BOARD_C218_ISA:
974 case MOXA_BOARD_C218_PCI:
975 board->numPorts = 8;
976 break;
977
978 case MOXA_BOARD_CP204J:
979 board->numPorts = 4;
980 break;
981 default:
982 board->numPorts = 0;
983 break;
984 }
985 board->busType = MOXA_BUS_TYPE_PCI;
986
987 retval = moxa_init_board(board, &pdev->dev);
988 if (retval)
989 goto err_base;
990
991 pci_set_drvdata(pdev, board);
992
993 dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
994 moxa_brdname[board_type - 1], board->numPorts);
995
996 return 0;
997 err_base:
998 iounmap(board->basemem);
999 board->basemem = NULL;
1000 err_reg:
1001 pci_release_region(pdev, 2);
1002 err:
1003 return retval;
1004 }
1005
1006 static void __devexit moxa_pci_remove(struct pci_dev *pdev)
1007 {
1008 struct moxa_board_conf *brd = pci_get_drvdata(pdev);
1009
1010 moxa_board_deinit(brd);
1011
1012 pci_release_region(pdev, 2);
1013 }
1014
1015 static struct pci_driver moxa_pci_driver = {
1016 .name = "moxa",
1017 .id_table = moxa_pcibrds,
1018 .probe = moxa_pci_probe,
1019 .remove = __devexit_p(moxa_pci_remove)
1020 };
1021 #endif /* CONFIG_PCI */
1022
1023 static int __init moxa_init(void)
1024 {
1025 unsigned int isabrds = 0;
1026 int retval = 0;
1027
1028 printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1029 MOXA_VERSION);
1030 moxaDriver = alloc_tty_driver(MAX_PORTS + 1);
1031 if (!moxaDriver)
1032 return -ENOMEM;
1033
1034 moxaDriver->owner = THIS_MODULE;
1035 moxaDriver->name = "ttyMX";
1036 moxaDriver->major = ttymajor;
1037 moxaDriver->minor_start = 0;
1038 moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1039 moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1040 moxaDriver->init_termios = tty_std_termios;
1041 moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1042 moxaDriver->init_termios.c_ispeed = 9600;
1043 moxaDriver->init_termios.c_ospeed = 9600;
1044 moxaDriver->flags = TTY_DRIVER_REAL_RAW;
1045 tty_set_operations(moxaDriver, &moxa_ops);
1046
1047 if (tty_register_driver(moxaDriver)) {
1048 printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1049 put_tty_driver(moxaDriver);
1050 return -1;
1051 }
1052
1053 /* Find the boards defined from module args. */
1054 #ifdef MODULE
1055 {
1056 struct moxa_board_conf *brd = moxa_boards;
1057 unsigned int i;
1058 for (i = 0; i < MAX_BOARDS; i++) {
1059 if (!baseaddr[i])
1060 break;
1061 if (type[i] == MOXA_BOARD_C218_ISA ||
1062 type[i] == MOXA_BOARD_C320_ISA) {
1063 pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1064 isabrds + 1, moxa_brdname[type[i] - 1],
1065 baseaddr[i]);
1066 brd->boardType = type[i];
1067 brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1068 numports[i];
1069 brd->busType = MOXA_BUS_TYPE_ISA;
1070 brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1071 if (!brd->basemem) {
1072 printk(KERN_ERR "MOXA: can't remap %lx\n",
1073 baseaddr[i]);
1074 continue;
1075 }
1076 if (moxa_init_board(brd, NULL)) {
1077 iounmap(brd->basemem);
1078 brd->basemem = NULL;
1079 continue;
1080 }
1081
1082 printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1083 "ready (%u ports, firmware loaded)\n",
1084 baseaddr[i], brd->numPorts);
1085
1086 brd++;
1087 isabrds++;
1088 }
1089 }
1090 }
1091 #endif
1092
1093 #ifdef CONFIG_PCI
1094 retval = pci_register_driver(&moxa_pci_driver);
1095 if (retval) {
1096 printk(KERN_ERR "Can't register MOXA pci driver!\n");
1097 if (isabrds)
1098 retval = 0;
1099 }
1100 #endif
1101
1102 return retval;
1103 }
1104
1105 static void __exit moxa_exit(void)
1106 {
1107 unsigned int i;
1108
1109 #ifdef CONFIG_PCI
1110 pci_unregister_driver(&moxa_pci_driver);
1111 #endif
1112
1113 for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1114 if (moxa_boards[i].ready)
1115 moxa_board_deinit(&moxa_boards[i]);
1116
1117 del_timer_sync(&moxaTimer);
1118
1119 if (tty_unregister_driver(moxaDriver))
1120 printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1121 "serial driver\n");
1122 put_tty_driver(moxaDriver);
1123 }
1124
1125 module_init(moxa_init);
1126 module_exit(moxa_exit);
1127
1128 static void moxa_shutdown(struct tty_port *port)
1129 {
1130 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1131 MoxaPortDisable(ch);
1132 MoxaPortFlushData(ch, 2);
1133 clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
1134 }
1135
1136 static int moxa_carrier_raised(struct tty_port *port)
1137 {
1138 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1139 int dcd;
1140
1141 spin_lock_irq(&port->lock);
1142 dcd = ch->DCDState;
1143 spin_unlock_irq(&port->lock);
1144 return dcd;
1145 }
1146
1147 static void moxa_dtr_rts(struct tty_port *port, int onoff)
1148 {
1149 struct moxa_port *ch = container_of(port, struct moxa_port, port);
1150 MoxaPortLineCtrl(ch, onoff, onoff);
1151 }
1152
1153
1154 static int moxa_open(struct tty_struct *tty, struct file *filp)
1155 {
1156 struct moxa_board_conf *brd;
1157 struct moxa_port *ch;
1158 int port;
1159 int retval;
1160
1161 port = tty->index;
1162 if (port == MAX_PORTS) {
1163 return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1164 }
1165 if (mutex_lock_interruptible(&moxa_openlock))
1166 return -ERESTARTSYS;
1167 brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1168 if (!brd->ready) {
1169 mutex_unlock(&moxa_openlock);
1170 return -ENODEV;
1171 }
1172
1173 if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1174 mutex_unlock(&moxa_openlock);
1175 return -ENODEV;
1176 }
1177
1178 ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1179 ch->port.count++;
1180 tty->driver_data = ch;
1181 tty_port_tty_set(&ch->port, tty);
1182 mutex_lock(&ch->port.mutex);
1183 if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1184 ch->statusflags = 0;
1185 moxa_set_tty_param(tty, tty->termios);
1186 MoxaPortLineCtrl(ch, 1, 1);
1187 MoxaPortEnable(ch);
1188 MoxaSetFifo(ch, ch->type == PORT_16550A);
1189 ch->port.flags |= ASYNC_INITIALIZED;
1190 }
1191 mutex_unlock(&ch->port.mutex);
1192 mutex_unlock(&moxa_openlock);
1193
1194 retval = tty_port_block_til_ready(&ch->port, tty, filp);
1195 if (retval == 0)
1196 set_bit(ASYNCB_NORMAL_ACTIVE, &ch->port.flags);
1197 return retval;
1198 }
1199
1200 static void moxa_close(struct tty_struct *tty, struct file *filp)
1201 {
1202 struct moxa_port *ch = tty->driver_data;
1203 ch->cflag = tty->termios->c_cflag;
1204 tty_port_close(&ch->port, tty, filp);
1205 }
1206
1207 static int moxa_write(struct tty_struct *tty,
1208 const unsigned char *buf, int count)
1209 {
1210 struct moxa_port *ch = tty->driver_data;
1211 int len;
1212
1213 if (ch == NULL)
1214 return 0;
1215
1216 spin_lock_bh(&moxa_lock);
1217 len = MoxaPortWriteData(tty, buf, count);
1218 spin_unlock_bh(&moxa_lock);
1219
1220 set_bit(LOWWAIT, &ch->statusflags);
1221 return len;
1222 }
1223
1224 static int moxa_write_room(struct tty_struct *tty)
1225 {
1226 struct moxa_port *ch;
1227
1228 if (tty->stopped)
1229 return 0;
1230 ch = tty->driver_data;
1231 if (ch == NULL)
1232 return 0;
1233 return MoxaPortTxFree(ch);
1234 }
1235
1236 static void moxa_flush_buffer(struct tty_struct *tty)
1237 {
1238 struct moxa_port *ch = tty->driver_data;
1239
1240 if (ch == NULL)
1241 return;
1242 MoxaPortFlushData(ch, 1);
1243 tty_wakeup(tty);
1244 }
1245
1246 static int moxa_chars_in_buffer(struct tty_struct *tty)
1247 {
1248 struct moxa_port *ch = tty->driver_data;
1249 int chars;
1250
1251 chars = MoxaPortTxQueue(ch);
1252 if (chars)
1253 /*
1254 * Make it possible to wakeup anything waiting for output
1255 * in tty_ioctl.c, etc.
1256 */
1257 set_bit(EMPTYWAIT, &ch->statusflags);
1258 return chars;
1259 }
1260
1261 static int moxa_tiocmget(struct tty_struct *tty, struct file *file)
1262 {
1263 struct moxa_port *ch = tty->driver_data;
1264 int flag = 0, dtr, rts;
1265
1266 MoxaPortGetLineOut(ch, &dtr, &rts);
1267 if (dtr)
1268 flag |= TIOCM_DTR;
1269 if (rts)
1270 flag |= TIOCM_RTS;
1271 dtr = MoxaPortLineStatus(ch);
1272 if (dtr & 1)
1273 flag |= TIOCM_CTS;
1274 if (dtr & 2)
1275 flag |= TIOCM_DSR;
1276 if (dtr & 4)
1277 flag |= TIOCM_CD;
1278 return flag;
1279 }
1280
1281 static int moxa_tiocmset(struct tty_struct *tty, struct file *file,
1282 unsigned int set, unsigned int clear)
1283 {
1284 struct moxa_port *ch;
1285 int port;
1286 int dtr, rts;
1287
1288 port = tty->index;
1289 mutex_lock(&moxa_openlock);
1290 ch = tty->driver_data;
1291 if (!ch) {
1292 mutex_unlock(&moxa_openlock);
1293 return -EINVAL;
1294 }
1295
1296 MoxaPortGetLineOut(ch, &dtr, &rts);
1297 if (set & TIOCM_RTS)
1298 rts = 1;
1299 if (set & TIOCM_DTR)
1300 dtr = 1;
1301 if (clear & TIOCM_RTS)
1302 rts = 0;
1303 if (clear & TIOCM_DTR)
1304 dtr = 0;
1305 MoxaPortLineCtrl(ch, dtr, rts);
1306 mutex_unlock(&moxa_openlock);
1307 return 0;
1308 }
1309
1310 static void moxa_set_termios(struct tty_struct *tty,
1311 struct ktermios *old_termios)
1312 {
1313 struct moxa_port *ch = tty->driver_data;
1314
1315 if (ch == NULL)
1316 return;
1317 moxa_set_tty_param(tty, old_termios);
1318 if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1319 wake_up_interruptible(&ch->port.open_wait);
1320 }
1321
1322 static void moxa_stop(struct tty_struct *tty)
1323 {
1324 struct moxa_port *ch = tty->driver_data;
1325
1326 if (ch == NULL)
1327 return;
1328 MoxaPortTxDisable(ch);
1329 set_bit(TXSTOPPED, &ch->statusflags);
1330 }
1331
1332
1333 static void moxa_start(struct tty_struct *tty)
1334 {
1335 struct moxa_port *ch = tty->driver_data;
1336
1337 if (ch == NULL)
1338 return;
1339
1340 if (!(ch->statusflags & TXSTOPPED))
1341 return;
1342
1343 MoxaPortTxEnable(ch);
1344 clear_bit(TXSTOPPED, &ch->statusflags);
1345 }
1346
1347 static void moxa_hangup(struct tty_struct *tty)
1348 {
1349 struct moxa_port *ch = tty->driver_data;
1350 tty_port_hangup(&ch->port);
1351 }
1352
1353 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1354 {
1355 struct tty_struct *tty;
1356 unsigned long flags;
1357 dcd = !!dcd;
1358
1359 spin_lock_irqsave(&p->port.lock, flags);
1360 if (dcd != p->DCDState) {
1361 p->DCDState = dcd;
1362 spin_unlock_irqrestore(&p->port.lock, flags);
1363 tty = tty_port_tty_get(&p->port);
1364 if (tty && C_CLOCAL(tty) && !dcd)
1365 tty_hangup(tty);
1366 tty_kref_put(tty);
1367 }
1368 else
1369 spin_unlock_irqrestore(&p->port.lock, flags);
1370 }
1371
1372 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1373 u16 __iomem *ip)
1374 {
1375 struct tty_struct *tty = tty_port_tty_get(&p->port);
1376 void __iomem *ofsAddr;
1377 unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1378 u16 intr;
1379
1380 if (tty) {
1381 if (test_bit(EMPTYWAIT, &p->statusflags) &&
1382 MoxaPortTxQueue(p) == 0) {
1383 clear_bit(EMPTYWAIT, &p->statusflags);
1384 tty_wakeup(tty);
1385 }
1386 if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
1387 MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1388 clear_bit(LOWWAIT, &p->statusflags);
1389 tty_wakeup(tty);
1390 }
1391
1392 if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
1393 MoxaPortRxQueue(p) > 0) { /* RX */
1394 MoxaPortReadData(p);
1395 tty_schedule_flip(tty);
1396 }
1397 } else {
1398 clear_bit(EMPTYWAIT, &p->statusflags);
1399 MoxaPortFlushData(p, 0); /* flush RX */
1400 }
1401
1402 if (!handle) /* nothing else to do */
1403 goto put;
1404
1405 intr = readw(ip); /* port irq status */
1406 if (intr == 0)
1407 goto put;
1408
1409 writew(0, ip); /* ACK port */
1410 ofsAddr = p->tableAddr;
1411 if (intr & IntrTx) /* disable tx intr */
1412 writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1413 ofsAddr + HostStat);
1414
1415 if (!inited)
1416 goto put;
1417
1418 if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1419 tty_insert_flip_char(tty, 0, TTY_BREAK);
1420 tty_schedule_flip(tty);
1421 }
1422
1423 if (intr & IntrLine)
1424 moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1425 put:
1426 tty_kref_put(tty);
1427
1428 return 0;
1429 }
1430
1431 static void moxa_poll(unsigned long ignored)
1432 {
1433 struct moxa_board_conf *brd;
1434 u16 __iomem *ip;
1435 unsigned int card, port, served = 0;
1436
1437 spin_lock(&moxa_lock);
1438 for (card = 0; card < MAX_BOARDS; card++) {
1439 brd = &moxa_boards[card];
1440 if (!brd->ready)
1441 continue;
1442
1443 served++;
1444
1445 ip = NULL;
1446 if (readb(brd->intPend) == 0xff)
1447 ip = brd->intTable + readb(brd->intNdx);
1448
1449 for (port = 0; port < brd->numPorts; port++)
1450 moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1451
1452 if (ip)
1453 writeb(0, brd->intPend); /* ACK */
1454
1455 if (moxaLowWaterChk) {
1456 struct moxa_port *p = brd->ports;
1457 for (port = 0; port < brd->numPorts; port++, p++)
1458 if (p->lowChkFlag) {
1459 p->lowChkFlag = 0;
1460 moxa_low_water_check(p->tableAddr);
1461 }
1462 }
1463 }
1464 moxaLowWaterChk = 0;
1465
1466 if (served)
1467 mod_timer(&moxaTimer, jiffies + HZ / 50);
1468 spin_unlock(&moxa_lock);
1469 }
1470
1471 /******************************************************************************/
1472
1473 static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1474 {
1475 register struct ktermios *ts = tty->termios;
1476 struct moxa_port *ch = tty->driver_data;
1477 int rts, cts, txflow, rxflow, xany, baud;
1478
1479 rts = cts = txflow = rxflow = xany = 0;
1480 if (ts->c_cflag & CRTSCTS)
1481 rts = cts = 1;
1482 if (ts->c_iflag & IXON)
1483 txflow = 1;
1484 if (ts->c_iflag & IXOFF)
1485 rxflow = 1;
1486 if (ts->c_iflag & IXANY)
1487 xany = 1;
1488
1489 /* Clear the features we don't support */
1490 ts->c_cflag &= ~CMSPAR;
1491 MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1492 baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1493 if (baud == -1)
1494 baud = tty_termios_baud_rate(old_termios);
1495 /* Not put the baud rate into the termios data */
1496 tty_encode_baud_rate(tty, baud, baud);
1497 }
1498
1499 /*****************************************************************************
1500 * Driver level functions: *
1501 *****************************************************************************/
1502
1503 static void MoxaPortFlushData(struct moxa_port *port, int mode)
1504 {
1505 void __iomem *ofsAddr;
1506 if (mode < 0 || mode > 2)
1507 return;
1508 ofsAddr = port->tableAddr;
1509 moxafunc(ofsAddr, FC_FlushQueue, mode);
1510 if (mode != 1) {
1511 port->lowChkFlag = 0;
1512 moxa_low_water_check(ofsAddr);
1513 }
1514 }
1515
1516 /*
1517 * Moxa Port Number Description:
1518 *
1519 * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1520 * the port number using in MOXA driver functions will be 0 to 31 for
1521 * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1522 * to 127 for fourth. For example, if you setup three MOXA boards,
1523 * first board is C218, second board is C320-16 and third board is
1524 * C320-32. The port number of first board (C218 - 8 ports) is from
1525 * 0 to 7. The port number of second board (C320 - 16 ports) is form
1526 * 32 to 47. The port number of third board (C320 - 32 ports) is from
1527 * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1528 * 127 will be invalid.
1529 *
1530 *
1531 * Moxa Functions Description:
1532 *
1533 * Function 1: Driver initialization routine, this routine must be
1534 * called when initialized driver.
1535 * Syntax:
1536 * void MoxaDriverInit();
1537 *
1538 *
1539 * Function 2: Moxa driver private IOCTL command processing.
1540 * Syntax:
1541 * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1542 *
1543 * unsigned int cmd : IOCTL command
1544 * unsigned long arg : IOCTL argument
1545 * int port : port number (0 - 127)
1546 *
1547 * return: 0 (OK)
1548 * -EINVAL
1549 * -ENOIOCTLCMD
1550 *
1551 *
1552 * Function 6: Enable this port to start Tx/Rx data.
1553 * Syntax:
1554 * void MoxaPortEnable(int port);
1555 * int port : port number (0 - 127)
1556 *
1557 *
1558 * Function 7: Disable this port
1559 * Syntax:
1560 * void MoxaPortDisable(int port);
1561 * int port : port number (0 - 127)
1562 *
1563 *
1564 * Function 10: Setting baud rate of this port.
1565 * Syntax:
1566 * speed_t MoxaPortSetBaud(int port, speed_t baud);
1567 * int port : port number (0 - 127)
1568 * long baud : baud rate (50 - 115200)
1569 *
1570 * return: 0 : this port is invalid or baud < 50
1571 * 50 - 115200 : the real baud rate set to the port, if
1572 * the argument baud is large than maximun
1573 * available baud rate, the real setting
1574 * baud rate will be the maximun baud rate.
1575 *
1576 *
1577 * Function 12: Configure the port.
1578 * Syntax:
1579 * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1580 * int port : port number (0 - 127)
1581 * struct ktermios * termio : termio structure pointer
1582 * speed_t baud : baud rate
1583 *
1584 * return: -1 : this port is invalid or termio == NULL
1585 * 0 : setting O.K.
1586 *
1587 *
1588 * Function 13: Get the DTR/RTS state of this port.
1589 * Syntax:
1590 * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1591 * int port : port number (0 - 127)
1592 * int * dtrState : pointer to INT to receive the current DTR
1593 * state. (if NULL, this function will not
1594 * write to this address)
1595 * int * rtsState : pointer to INT to receive the current RTS
1596 * state. (if NULL, this function will not
1597 * write to this address)
1598 *
1599 * return: -1 : this port is invalid
1600 * 0 : O.K.
1601 *
1602 *
1603 * Function 14: Setting the DTR/RTS output state of this port.
1604 * Syntax:
1605 * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1606 * int port : port number (0 - 127)
1607 * int dtrState : DTR output state (0: off, 1: on)
1608 * int rtsState : RTS output state (0: off, 1: on)
1609 *
1610 *
1611 * Function 15: Setting the flow control of this port.
1612 * Syntax:
1613 * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1614 * int txFlow,int xany);
1615 * int port : port number (0 - 127)
1616 * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1617 * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1618 * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1619 * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1620 * int xany : S/W XANY flow control (0: no, 1: yes)
1621 *
1622 *
1623 * Function 16: Get ths line status of this port
1624 * Syntax:
1625 * int MoxaPortLineStatus(int port);
1626 * int port : port number (0 - 127)
1627 *
1628 * return: Bit 0 - CTS state (0: off, 1: on)
1629 * Bit 1 - DSR state (0: off, 1: on)
1630 * Bit 2 - DCD state (0: off, 1: on)
1631 *
1632 *
1633 * Function 19: Flush the Rx/Tx buffer data of this port.
1634 * Syntax:
1635 * void MoxaPortFlushData(int port, int mode);
1636 * int port : port number (0 - 127)
1637 * int mode
1638 * 0 : flush the Rx buffer
1639 * 1 : flush the Tx buffer
1640 * 2 : flush the Rx and Tx buffer
1641 *
1642 *
1643 * Function 20: Write data.
1644 * Syntax:
1645 * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1646 * int port : port number (0 - 127)
1647 * unsigned char * buffer : pointer to write data buffer.
1648 * int length : write data length
1649 *
1650 * return: 0 - length : real write data length
1651 *
1652 *
1653 * Function 21: Read data.
1654 * Syntax:
1655 * int MoxaPortReadData(int port, struct tty_struct *tty);
1656 * int port : port number (0 - 127)
1657 * struct tty_struct *tty : tty for data
1658 *
1659 * return: 0 - length : real read data length
1660 *
1661 *
1662 * Function 24: Get the Tx buffer current queued data bytes
1663 * Syntax:
1664 * int MoxaPortTxQueue(int port);
1665 * int port : port number (0 - 127)
1666 *
1667 * return: .. : Tx buffer current queued data bytes
1668 *
1669 *
1670 * Function 25: Get the Tx buffer current free space
1671 * Syntax:
1672 * int MoxaPortTxFree(int port);
1673 * int port : port number (0 - 127)
1674 *
1675 * return: .. : Tx buffer current free space
1676 *
1677 *
1678 * Function 26: Get the Rx buffer current queued data bytes
1679 * Syntax:
1680 * int MoxaPortRxQueue(int port);
1681 * int port : port number (0 - 127)
1682 *
1683 * return: .. : Rx buffer current queued data bytes
1684 *
1685 *
1686 * Function 28: Disable port data transmission.
1687 * Syntax:
1688 * void MoxaPortTxDisable(int port);
1689 * int port : port number (0 - 127)
1690 *
1691 *
1692 * Function 29: Enable port data transmission.
1693 * Syntax:
1694 * void MoxaPortTxEnable(int port);
1695 * int port : port number (0 - 127)
1696 *
1697 *
1698 * Function 31: Get the received BREAK signal count and reset it.
1699 * Syntax:
1700 * int MoxaPortResetBrkCnt(int port);
1701 * int port : port number (0 - 127)
1702 *
1703 * return: 0 - .. : BREAK signal count
1704 *
1705 *
1706 */
1707
1708 static void MoxaPortEnable(struct moxa_port *port)
1709 {
1710 void __iomem *ofsAddr;
1711 u16 lowwater = 512;
1712
1713 ofsAddr = port->tableAddr;
1714 writew(lowwater, ofsAddr + Low_water);
1715 if (MOXA_IS_320(port->board))
1716 moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1717 else
1718 writew(readw(ofsAddr + HostStat) | WakeupBreak,
1719 ofsAddr + HostStat);
1720
1721 moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1722 moxafunc(ofsAddr, FC_FlushQueue, 2);
1723
1724 moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1725 MoxaPortLineStatus(port);
1726 }
1727
1728 static void MoxaPortDisable(struct moxa_port *port)
1729 {
1730 void __iomem *ofsAddr = port->tableAddr;
1731
1732 moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1733 moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1734 writew(0, ofsAddr + HostStat);
1735 moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1736 }
1737
1738 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1739 {
1740 void __iomem *ofsAddr = port->tableAddr;
1741 unsigned int clock, val;
1742 speed_t max;
1743
1744 max = MOXA_IS_320(port->board) ? 460800 : 921600;
1745 if (baud < 50)
1746 return 0;
1747 if (baud > max)
1748 baud = max;
1749 clock = 921600;
1750 val = clock / baud;
1751 moxafunc(ofsAddr, FC_SetBaud, val);
1752 baud = clock / val;
1753 return baud;
1754 }
1755
1756 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1757 speed_t baud)
1758 {
1759 void __iomem *ofsAddr;
1760 tcflag_t cflag;
1761 tcflag_t mode = 0;
1762
1763 ofsAddr = port->tableAddr;
1764 cflag = termio->c_cflag; /* termio->c_cflag */
1765
1766 mode = termio->c_cflag & CSIZE;
1767 if (mode == CS5)
1768 mode = MX_CS5;
1769 else if (mode == CS6)
1770 mode = MX_CS6;
1771 else if (mode == CS7)
1772 mode = MX_CS7;
1773 else if (mode == CS8)
1774 mode = MX_CS8;
1775
1776 if (termio->c_cflag & CSTOPB) {
1777 if (mode == MX_CS5)
1778 mode |= MX_STOP15;
1779 else
1780 mode |= MX_STOP2;
1781 } else
1782 mode |= MX_STOP1;
1783
1784 if (termio->c_cflag & PARENB) {
1785 if (termio->c_cflag & PARODD)
1786 mode |= MX_PARODD;
1787 else
1788 mode |= MX_PAREVEN;
1789 } else
1790 mode |= MX_PARNONE;
1791
1792 moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1793
1794 if (MOXA_IS_320(port->board) && baud >= 921600)
1795 return -1;
1796
1797 baud = MoxaPortSetBaud(port, baud);
1798
1799 if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1800 spin_lock_irq(&moxafunc_lock);
1801 writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1802 writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1803 writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1804 moxa_wait_finish(ofsAddr);
1805 spin_unlock_irq(&moxafunc_lock);
1806
1807 }
1808 return baud;
1809 }
1810
1811 static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1812 int *rtsState)
1813 {
1814 if (dtrState)
1815 *dtrState = !!(port->lineCtrl & DTR_ON);
1816 if (rtsState)
1817 *rtsState = !!(port->lineCtrl & RTS_ON);
1818
1819 return 0;
1820 }
1821
1822 static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1823 {
1824 u8 mode = 0;
1825
1826 if (dtr)
1827 mode |= DTR_ON;
1828 if (rts)
1829 mode |= RTS_ON;
1830 port->lineCtrl = mode;
1831 moxafunc(port->tableAddr, FC_LineControl, mode);
1832 }
1833
1834 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1835 int txflow, int rxflow, int txany)
1836 {
1837 int mode = 0;
1838
1839 if (rts)
1840 mode |= RTS_FlowCtl;
1841 if (cts)
1842 mode |= CTS_FlowCtl;
1843 if (txflow)
1844 mode |= Tx_FlowCtl;
1845 if (rxflow)
1846 mode |= Rx_FlowCtl;
1847 if (txany)
1848 mode |= IXM_IXANY;
1849 moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1850 }
1851
1852 static int MoxaPortLineStatus(struct moxa_port *port)
1853 {
1854 void __iomem *ofsAddr;
1855 int val;
1856
1857 ofsAddr = port->tableAddr;
1858 if (MOXA_IS_320(port->board))
1859 val = moxafuncret(ofsAddr, FC_LineStatus, 0);
1860 else
1861 val = readw(ofsAddr + FlagStat) >> 4;
1862 val &= 0x0B;
1863 if (val & 8)
1864 val |= 4;
1865 moxa_new_dcdstate(port, val & 8);
1866 val &= 7;
1867 return val;
1868 }
1869
1870 static int MoxaPortWriteData(struct tty_struct *tty,
1871 const unsigned char *buffer, int len)
1872 {
1873 struct moxa_port *port = tty->driver_data;
1874 void __iomem *baseAddr, *ofsAddr, *ofs;
1875 unsigned int c, total;
1876 u16 head, tail, tx_mask, spage, epage;
1877 u16 pageno, pageofs, bufhead;
1878
1879 ofsAddr = port->tableAddr;
1880 baseAddr = port->board->basemem;
1881 tx_mask = readw(ofsAddr + TX_mask);
1882 spage = readw(ofsAddr + Page_txb);
1883 epage = readw(ofsAddr + EndPage_txb);
1884 tail = readw(ofsAddr + TXwptr);
1885 head = readw(ofsAddr + TXrptr);
1886 c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1887 if (c > len)
1888 c = len;
1889 moxaLog.txcnt[port->port.tty->index] += c;
1890 total = c;
1891 if (spage == epage) {
1892 bufhead = readw(ofsAddr + Ofs_txb);
1893 writew(spage, baseAddr + Control_reg);
1894 while (c > 0) {
1895 if (head > tail)
1896 len = head - tail - 1;
1897 else
1898 len = tx_mask + 1 - tail;
1899 len = (c > len) ? len : c;
1900 ofs = baseAddr + DynPage_addr + bufhead + tail;
1901 memcpy_toio(ofs, buffer, len);
1902 buffer += len;
1903 tail = (tail + len) & tx_mask;
1904 c -= len;
1905 }
1906 } else {
1907 pageno = spage + (tail >> 13);
1908 pageofs = tail & Page_mask;
1909 while (c > 0) {
1910 len = Page_size - pageofs;
1911 if (len > c)
1912 len = c;
1913 writeb(pageno, baseAddr + Control_reg);
1914 ofs = baseAddr + DynPage_addr + pageofs;
1915 memcpy_toio(ofs, buffer, len);
1916 buffer += len;
1917 if (++pageno == epage)
1918 pageno = spage;
1919 pageofs = 0;
1920 c -= len;
1921 }
1922 tail = (tail + total) & tx_mask;
1923 }
1924 writew(tail, ofsAddr + TXwptr);
1925 writeb(1, ofsAddr + CD180TXirq); /* start to send */
1926 return total;
1927 }
1928
1929 static int MoxaPortReadData(struct moxa_port *port)
1930 {
1931 struct tty_struct *tty = port->port.tty;
1932 unsigned char *dst;
1933 void __iomem *baseAddr, *ofsAddr, *ofs;
1934 unsigned int count, len, total;
1935 u16 tail, rx_mask, spage, epage;
1936 u16 pageno, pageofs, bufhead, head;
1937
1938 ofsAddr = port->tableAddr;
1939 baseAddr = port->board->basemem;
1940 head = readw(ofsAddr + RXrptr);
1941 tail = readw(ofsAddr + RXwptr);
1942 rx_mask = readw(ofsAddr + RX_mask);
1943 spage = readw(ofsAddr + Page_rxb);
1944 epage = readw(ofsAddr + EndPage_rxb);
1945 count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
1946 if (count == 0)
1947 return 0;
1948
1949 total = count;
1950 moxaLog.rxcnt[tty->index] += total;
1951 if (spage == epage) {
1952 bufhead = readw(ofsAddr + Ofs_rxb);
1953 writew(spage, baseAddr + Control_reg);
1954 while (count > 0) {
1955 ofs = baseAddr + DynPage_addr + bufhead + head;
1956 len = (tail >= head) ? (tail - head) :
1957 (rx_mask + 1 - head);
1958 len = tty_prepare_flip_string(tty, &dst,
1959 min(len, count));
1960 memcpy_fromio(dst, ofs, len);
1961 head = (head + len) & rx_mask;
1962 count -= len;
1963 }
1964 } else {
1965 pageno = spage + (head >> 13);
1966 pageofs = head & Page_mask;
1967 while (count > 0) {
1968 writew(pageno, baseAddr + Control_reg);
1969 ofs = baseAddr + DynPage_addr + pageofs;
1970 len = tty_prepare_flip_string(tty, &dst,
1971 min(Page_size - pageofs, count));
1972 memcpy_fromio(dst, ofs, len);
1973
1974 count -= len;
1975 pageofs = (pageofs + len) & Page_mask;
1976 if (pageofs == 0 && ++pageno == epage)
1977 pageno = spage;
1978 }
1979 head = (head + total) & rx_mask;
1980 }
1981 writew(head, ofsAddr + RXrptr);
1982 if (readb(ofsAddr + FlagStat) & Xoff_state) {
1983 moxaLowWaterChk = 1;
1984 port->lowChkFlag = 1;
1985 }
1986 return total;
1987 }
1988
1989
1990 static int MoxaPortTxQueue(struct moxa_port *port)
1991 {
1992 void __iomem *ofsAddr = port->tableAddr;
1993 u16 rptr, wptr, mask;
1994
1995 rptr = readw(ofsAddr + TXrptr);
1996 wptr = readw(ofsAddr + TXwptr);
1997 mask = readw(ofsAddr + TX_mask);
1998 return (wptr - rptr) & mask;
1999 }
2000
2001 static int MoxaPortTxFree(struct moxa_port *port)
2002 {
2003 void __iomem *ofsAddr = port->tableAddr;
2004 u16 rptr, wptr, mask;
2005
2006 rptr = readw(ofsAddr + TXrptr);
2007 wptr = readw(ofsAddr + TXwptr);
2008 mask = readw(ofsAddr + TX_mask);
2009 return mask - ((wptr - rptr) & mask);
2010 }
2011
2012 static int MoxaPortRxQueue(struct moxa_port *port)
2013 {
2014 void __iomem *ofsAddr = port->tableAddr;
2015 u16 rptr, wptr, mask;
2016
2017 rptr = readw(ofsAddr + RXrptr);
2018 wptr = readw(ofsAddr + RXwptr);
2019 mask = readw(ofsAddr + RX_mask);
2020 return (wptr - rptr) & mask;
2021 }
2022
2023 static void MoxaPortTxDisable(struct moxa_port *port)
2024 {
2025 moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2026 }
2027
2028 static void MoxaPortTxEnable(struct moxa_port *port)
2029 {
2030 moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2031 }
2032
2033 static int moxa_get_serial_info(struct moxa_port *info,
2034 struct serial_struct __user *retinfo)
2035 {
2036 struct serial_struct tmp = {
2037 .type = info->type,
2038 .line = info->port.tty->index,
2039 .flags = info->port.flags,
2040 .baud_base = 921600,
2041 .close_delay = info->port.close_delay
2042 };
2043 return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2044 }
2045
2046
2047 static int moxa_set_serial_info(struct moxa_port *info,
2048 struct serial_struct __user *new_info)
2049 {
2050 struct serial_struct new_serial;
2051
2052 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2053 return -EFAULT;
2054
2055 if (new_serial.irq != 0 || new_serial.port != 0 ||
2056 new_serial.custom_divisor != 0 ||
2057 new_serial.baud_base != 921600)
2058 return -EPERM;
2059
2060 if (!capable(CAP_SYS_ADMIN)) {
2061 if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2062 (info->port.flags & ~ASYNC_USR_MASK)))
2063 return -EPERM;
2064 } else
2065 info->port.close_delay = new_serial.close_delay * HZ / 100;
2066
2067 new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2068 new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2069
2070 MoxaSetFifo(info, new_serial.type == PORT_16550A);
2071
2072 info->type = new_serial.type;
2073 return 0;
2074 }
2075
2076
2077
2078 /*****************************************************************************
2079 * Static local functions: *
2080 *****************************************************************************/
2081
2082 static void MoxaSetFifo(struct moxa_port *port, int enable)
2083 {
2084 void __iomem *ofsAddr = port->tableAddr;
2085
2086 if (!enable) {
2087 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2088 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2089 } else {
2090 moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2091 moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2092 }
2093 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree