Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
moxa.c
Go to the documentation of this file.
1 /*****************************************************************************/
2 /*
3  * moxa.c -- MOXA Intellio family multiport serial driver.
4  *
5  * Copyright (C) 1999-2000 Moxa Technologies ([email protected]).
6  * Copyright (c) 2007 Jiri Slaby <[email protected]>
7  *
8  * This code is loosely based on the Linux serial driver, written by
9  * Linus Torvalds, Theodore T'so and others.
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  */
16 
17 /*
18  * MOXA Intellio Series Driver
19  * for : LINUX
20  * date : 1999/1/7
21  * version : 5.1
22  */
23 
24 #include <linux/module.h>
25 #include <linux/types.h>
26 #include <linux/mm.h>
27 #include <linux/ioport.h>
28 #include <linux/errno.h>
29 #include <linux/firmware.h>
30 #include <linux/signal.h>
31 #include <linux/sched.h>
32 #include <linux/timer.h>
33 #include <linux/interrupt.h>
34 #include <linux/tty.h>
35 #include <linux/tty_flip.h>
36 #include <linux/major.h>
37 #include <linux/string.h>
38 #include <linux/fcntl.h>
39 #include <linux/ptrace.h>
40 #include <linux/serial.h>
41 #include <linux/tty_driver.h>
42 #include <linux/delay.h>
43 #include <linux/pci.h>
44 #include <linux/init.h>
45 #include <linux/bitops.h>
46 #include <linux/slab.h>
47 #include <linux/ratelimit.h>
48 
49 #include <asm/io.h>
50 #include <asm/uaccess.h>
51 
52 #include "moxa.h"
53 
54 #define MOXA_VERSION "6.0k"
55 
56 #define MOXA_FW_HDRLEN 32
57 
58 #define MOXAMAJOR 172
59 
60 #define MAX_BOARDS 4 /* Don't change this value */
61 #define MAX_PORTS_PER_BOARD 32 /* Don't change this value */
62 #define MAX_PORTS (MAX_BOARDS * MAX_PORTS_PER_BOARD)
63 
64 #define MOXA_IS_320(brd) ((brd)->boardType == MOXA_BOARD_C320_ISA || \
65  (brd)->boardType == MOXA_BOARD_C320_PCI)
66 
67 /*
68  * Define the Moxa PCI vendor and device IDs.
69  */
70 #define MOXA_BUS_TYPE_ISA 0
71 #define MOXA_BUS_TYPE_PCI 1
72 
73 enum {
74  MOXA_BOARD_C218_PCI = 1,
75  MOXA_BOARD_C218_ISA,
76  MOXA_BOARD_C320_PCI,
77  MOXA_BOARD_C320_ISA,
78  MOXA_BOARD_CP204J,
79 };
80 
81 static char *moxa_brdname[] =
82 {
83  "C218 Turbo PCI series",
84  "C218 Turbo ISA series",
85  "C320 Turbo PCI series",
86  "C320 Turbo ISA series",
87  "CP-204J series",
88 };
89 
90 #ifdef CONFIG_PCI
91 static struct pci_device_id moxa_pcibrds[] = {
92  { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C218),
93  .driver_data = MOXA_BOARD_C218_PCI },
94  { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C320),
95  .driver_data = MOXA_BOARD_C320_PCI },
96  { PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP204J),
97  .driver_data = MOXA_BOARD_CP204J },
98  { 0 }
99 };
100 MODULE_DEVICE_TABLE(pci, moxa_pcibrds);
101 #endif /* CONFIG_PCI */
102 
103 struct moxa_port;
104 
105 static struct moxa_board_conf {
106  int boardType;
107  int numPorts;
108  int busType;
109 
110  unsigned int ready;
111 
112  struct moxa_port *ports;
113 
114  void __iomem *basemem;
115  void __iomem *intNdx;
116  void __iomem *intPend;
117  void __iomem *intTable;
118 } moxa_boards[MAX_BOARDS];
119 
120 struct mxser_mstatus {
121  tcflag_t cflag;
122  int cts;
123  int dsr;
124  int ri;
125  int dcd;
126 };
127 
128 struct moxaq_str {
129  int inq;
130  int outq;
131 };
132 
133 struct moxa_port {
134  struct tty_port port;
135  struct moxa_board_conf *board;
136  void __iomem *tableAddr;
137 
138  int type;
139  int cflag;
140  unsigned long statusflags;
141 
142  u8 DCDState; /* Protected by the port lock */
143  u8 lineCtrl;
144  u8 lowChkFlag;
145 };
146 
147 struct mon_str {
148  int tick;
149  int rxcnt[MAX_PORTS];
150  int txcnt[MAX_PORTS];
151 };
152 
153 /* statusflags */
154 #define TXSTOPPED 1
155 #define LOWWAIT 2
156 #define EMPTYWAIT 3
157 
158 #define SERIAL_DO_RESTART
159 
160 #define WAKEUP_CHARS 256
161 
162 static int ttymajor = MOXAMAJOR;
163 static struct mon_str moxaLog;
164 static unsigned int moxaFuncTout = HZ / 2;
165 static unsigned int moxaLowWaterChk;
166 static DEFINE_MUTEX(moxa_openlock);
167 static DEFINE_SPINLOCK(moxa_lock);
168 
169 static unsigned long baseaddr[MAX_BOARDS];
170 static unsigned int type[MAX_BOARDS];
171 static unsigned int numports[MAX_BOARDS];
172 static struct tty_port moxa_service_port;
173 
174 MODULE_AUTHOR("William Chen");
175 MODULE_DESCRIPTION("MOXA Intellio Family Multiport Board Device Driver");
176 MODULE_LICENSE("GPL");
177 MODULE_FIRMWARE("c218tunx.cod");
178 MODULE_FIRMWARE("cp204unx.cod");
179 MODULE_FIRMWARE("c320tunx.cod");
180 
181 module_param_array(type, uint, NULL, 0);
182 MODULE_PARM_DESC(type, "card type: C218=2, C320=4");
183 module_param_array(baseaddr, ulong, NULL, 0);
184 MODULE_PARM_DESC(baseaddr, "base address");
185 module_param_array(numports, uint, NULL, 0);
186 MODULE_PARM_DESC(numports, "numports (ignored for C218)");
187 
188 module_param(ttymajor, int, 0);
189 
190 /*
191  * static functions:
192  */
193 static int moxa_open(struct tty_struct *, struct file *);
194 static void moxa_close(struct tty_struct *, struct file *);
195 static int moxa_write(struct tty_struct *, const unsigned char *, int);
196 static int moxa_write_room(struct tty_struct *);
197 static void moxa_flush_buffer(struct tty_struct *);
198 static int moxa_chars_in_buffer(struct tty_struct *);
199 static void moxa_set_termios(struct tty_struct *, struct ktermios *);
200 static void moxa_stop(struct tty_struct *);
201 static void moxa_start(struct tty_struct *);
202 static void moxa_hangup(struct tty_struct *);
203 static int moxa_tiocmget(struct tty_struct *tty);
204 static int moxa_tiocmset(struct tty_struct *tty,
205  unsigned int set, unsigned int clear);
206 static void moxa_poll(unsigned long);
207 static void moxa_set_tty_param(struct tty_struct *, struct ktermios *);
208 static void moxa_shutdown(struct tty_port *);
209 static int moxa_carrier_raised(struct tty_port *);
210 static void moxa_dtr_rts(struct tty_port *, int);
211 /*
212  * moxa board interface functions:
213  */
214 static void MoxaPortEnable(struct moxa_port *);
215 static void MoxaPortDisable(struct moxa_port *);
216 static int MoxaPortSetTermio(struct moxa_port *, struct ktermios *, speed_t);
217 static int MoxaPortGetLineOut(struct moxa_port *, int *, int *);
218 static void MoxaPortLineCtrl(struct moxa_port *, int, int);
219 static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
220 static int MoxaPortLineStatus(struct moxa_port *);
221 static void MoxaPortFlushData(struct moxa_port *, int);
222 static int MoxaPortWriteData(struct tty_struct *, const unsigned char *, int);
223 static int MoxaPortReadData(struct moxa_port *);
224 static int MoxaPortTxQueue(struct moxa_port *);
225 static int MoxaPortRxQueue(struct moxa_port *);
226 static int MoxaPortTxFree(struct moxa_port *);
227 static void MoxaPortTxDisable(struct moxa_port *);
228 static void MoxaPortTxEnable(struct moxa_port *);
229 static int moxa_get_serial_info(struct moxa_port *, struct serial_struct __user *);
230 static int moxa_set_serial_info(struct moxa_port *, struct serial_struct __user *);
231 static void MoxaSetFifo(struct moxa_port *port, int enable);
232 
233 /*
234  * I/O functions
235  */
236 
237 static DEFINE_SPINLOCK(moxafunc_lock);
238 
239 static void moxa_wait_finish(void __iomem *ofsAddr)
240 {
241  unsigned long end = jiffies + moxaFuncTout;
242 
243  while (readw(ofsAddr + FuncCode) != 0)
244  if (time_after(jiffies, end))
245  return;
246  if (readw(ofsAddr + FuncCode) != 0)
247  printk_ratelimited(KERN_WARNING "moxa function expired\n");
248 }
249 
250 static void moxafunc(void __iomem *ofsAddr, u16 cmd, u16 arg)
251 {
252  unsigned long flags;
253  spin_lock_irqsave(&moxafunc_lock, flags);
254  writew(arg, ofsAddr + FuncArg);
255  writew(cmd, ofsAddr + FuncCode);
256  moxa_wait_finish(ofsAddr);
257  spin_unlock_irqrestore(&moxafunc_lock, flags);
258 }
259 
260 static int moxafuncret(void __iomem *ofsAddr, u16 cmd, u16 arg)
261 {
262  unsigned long flags;
263  u16 ret;
264  spin_lock_irqsave(&moxafunc_lock, flags);
265  writew(arg, ofsAddr + FuncArg);
266  writew(cmd, ofsAddr + FuncCode);
267  moxa_wait_finish(ofsAddr);
268  ret = readw(ofsAddr + FuncArg);
269  spin_unlock_irqrestore(&moxafunc_lock, flags);
270  return ret;
271 }
272 
273 static void moxa_low_water_check(void __iomem *ofsAddr)
274 {
275  u16 rptr, wptr, mask, len;
276 
277  if (readb(ofsAddr + FlagStat) & Xoff_state) {
278  rptr = readw(ofsAddr + RXrptr);
279  wptr = readw(ofsAddr + RXwptr);
280  mask = readw(ofsAddr + RX_mask);
281  len = (wptr - rptr) & mask;
282  if (len <= Low_water)
283  moxafunc(ofsAddr, FC_SendXon, 0);
284  }
285 }
286 
287 /*
288  * TTY operations
289  */
290 
291 static int moxa_ioctl(struct tty_struct *tty,
292  unsigned int cmd, unsigned long arg)
293 {
294  struct moxa_port *ch = tty->driver_data;
295  void __user *argp = (void __user *)arg;
296  int status, ret = 0;
297 
298  if (tty->index == MAX_PORTS) {
299  if (cmd != MOXA_GETDATACOUNT && cmd != MOXA_GET_IOQUEUE &&
300  cmd != MOXA_GETMSTATUS)
301  return -EINVAL;
302  } else if (!ch)
303  return -ENODEV;
304 
305  switch (cmd) {
306  case MOXA_GETDATACOUNT:
307  moxaLog.tick = jiffies;
308  if (copy_to_user(argp, &moxaLog, sizeof(moxaLog)))
309  ret = -EFAULT;
310  break;
311  case MOXA_FLUSH_QUEUE:
312  MoxaPortFlushData(ch, arg);
313  break;
314  case MOXA_GET_IOQUEUE: {
315  struct moxaq_str __user *argm = argp;
316  struct moxaq_str tmp;
317  struct moxa_port *p;
318  unsigned int i, j;
319 
320  for (i = 0; i < MAX_BOARDS; i++) {
321  p = moxa_boards[i].ports;
322  for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
323  memset(&tmp, 0, sizeof(tmp));
324  spin_lock_bh(&moxa_lock);
325  if (moxa_boards[i].ready) {
326  tmp.inq = MoxaPortRxQueue(p);
327  tmp.outq = MoxaPortTxQueue(p);
328  }
329  spin_unlock_bh(&moxa_lock);
330  if (copy_to_user(argm, &tmp, sizeof(tmp)))
331  return -EFAULT;
332  }
333  }
334  break;
335  } case MOXA_GET_OQUEUE:
336  status = MoxaPortTxQueue(ch);
337  ret = put_user(status, (unsigned long __user *)argp);
338  break;
339  case MOXA_GET_IQUEUE:
340  status = MoxaPortRxQueue(ch);
341  ret = put_user(status, (unsigned long __user *)argp);
342  break;
343  case MOXA_GETMSTATUS: {
344  struct mxser_mstatus __user *argm = argp;
345  struct mxser_mstatus tmp;
346  struct moxa_port *p;
347  unsigned int i, j;
348 
349  for (i = 0; i < MAX_BOARDS; i++) {
350  p = moxa_boards[i].ports;
351  for (j = 0; j < MAX_PORTS_PER_BOARD; j++, p++, argm++) {
352  struct tty_struct *ttyp;
353  memset(&tmp, 0, sizeof(tmp));
354  spin_lock_bh(&moxa_lock);
355  if (!moxa_boards[i].ready) {
356  spin_unlock_bh(&moxa_lock);
357  goto copy;
358  }
359 
360  status = MoxaPortLineStatus(p);
361  spin_unlock_bh(&moxa_lock);
362 
363  if (status & 1)
364  tmp.cts = 1;
365  if (status & 2)
366  tmp.dsr = 1;
367  if (status & 4)
368  tmp.dcd = 1;
369 
370  ttyp = tty_port_tty_get(&p->port);
371  if (!ttyp)
372  tmp.cflag = p->cflag;
373  else
374  tmp.cflag = ttyp->termios.c_cflag;
375  tty_kref_put(ttyp);
376 copy:
377  if (copy_to_user(argm, &tmp, sizeof(tmp)))
378  return -EFAULT;
379  }
380  }
381  break;
382  }
383  case TIOCGSERIAL:
384  mutex_lock(&ch->port.mutex);
385  ret = moxa_get_serial_info(ch, argp);
386  mutex_unlock(&ch->port.mutex);
387  break;
388  case TIOCSSERIAL:
389  mutex_lock(&ch->port.mutex);
390  ret = moxa_set_serial_info(ch, argp);
391  mutex_unlock(&ch->port.mutex);
392  break;
393  default:
394  ret = -ENOIOCTLCMD;
395  }
396  return ret;
397 }
398 
399 static int moxa_break_ctl(struct tty_struct *tty, int state)
400 {
401  struct moxa_port *port = tty->driver_data;
402 
403  moxafunc(port->tableAddr, state ? FC_SendBreak : FC_StopBreak,
404  Magic_code);
405  return 0;
406 }
407 
408 static const struct tty_operations moxa_ops = {
409  .open = moxa_open,
410  .close = moxa_close,
411  .write = moxa_write,
412  .write_room = moxa_write_room,
413  .flush_buffer = moxa_flush_buffer,
414  .chars_in_buffer = moxa_chars_in_buffer,
415  .ioctl = moxa_ioctl,
416  .set_termios = moxa_set_termios,
417  .stop = moxa_stop,
418  .start = moxa_start,
419  .hangup = moxa_hangup,
420  .break_ctl = moxa_break_ctl,
421  .tiocmget = moxa_tiocmget,
422  .tiocmset = moxa_tiocmset,
423 };
424 
425 static const struct tty_port_operations moxa_port_ops = {
426  .carrier_raised = moxa_carrier_raised,
427  .dtr_rts = moxa_dtr_rts,
428  .shutdown = moxa_shutdown,
429 };
430 
431 static struct tty_driver *moxaDriver;
432 static DEFINE_TIMER(moxaTimer, moxa_poll, 0, 0);
433 
434 /*
435  * HW init
436  */
437 
438 static int moxa_check_fw_model(struct moxa_board_conf *brd, u8 model)
439 {
440  switch (brd->boardType) {
441  case MOXA_BOARD_C218_ISA:
442  case MOXA_BOARD_C218_PCI:
443  if (model != 1)
444  goto err;
445  break;
446  case MOXA_BOARD_CP204J:
447  if (model != 3)
448  goto err;
449  break;
450  default:
451  if (model != 2)
452  goto err;
453  break;
454  }
455  return 0;
456 err:
457  return -EINVAL;
458 }
459 
460 static int moxa_check_fw(const void *ptr)
461 {
462  const __le16 *lptr = ptr;
463 
464  if (*lptr != cpu_to_le16(0x7980))
465  return -EINVAL;
466 
467  return 0;
468 }
469 
470 static int moxa_load_bios(struct moxa_board_conf *brd, const u8 *buf,
471  size_t len)
472 {
473  void __iomem *baseAddr = brd->basemem;
474  u16 tmp;
475 
476  writeb(HW_reset, baseAddr + Control_reg); /* reset */
477  msleep(10);
478  memset_io(baseAddr, 0, 4096);
479  memcpy_toio(baseAddr, buf, len); /* download BIOS */
480  writeb(0, baseAddr + Control_reg); /* restart */
481 
482  msleep(2000);
483 
484  switch (brd->boardType) {
485  case MOXA_BOARD_C218_ISA:
486  case MOXA_BOARD_C218_PCI:
487  tmp = readw(baseAddr + C218_key);
488  if (tmp != C218_KeyCode)
489  goto err;
490  break;
491  case MOXA_BOARD_CP204J:
492  tmp = readw(baseAddr + C218_key);
493  if (tmp != CP204J_KeyCode)
494  goto err;
495  break;
496  default:
497  tmp = readw(baseAddr + C320_key);
498  if (tmp != C320_KeyCode)
499  goto err;
500  tmp = readw(baseAddr + C320_status);
501  if (tmp != STS_init) {
502  printk(KERN_ERR "MOXA: bios upload failed -- CPU/Basic "
503  "module not found\n");
504  return -EIO;
505  }
506  break;
507  }
508 
509  return 0;
510 err:
511  printk(KERN_ERR "MOXA: bios upload failed -- board not found\n");
512  return -EIO;
513 }
514 
515 static int moxa_load_320b(struct moxa_board_conf *brd, const u8 *ptr,
516  size_t len)
517 {
518  void __iomem *baseAddr = brd->basemem;
519 
520  if (len < 7168) {
521  printk(KERN_ERR "MOXA: invalid 320 bios -- too short\n");
522  return -EINVAL;
523  }
524 
525  writew(len - 7168 - 2, baseAddr + C320bapi_len);
526  writeb(1, baseAddr + Control_reg); /* Select Page 1 */
527  memcpy_toio(baseAddr + DynPage_addr, ptr, 7168);
528  writeb(2, baseAddr + Control_reg); /* Select Page 2 */
529  memcpy_toio(baseAddr + DynPage_addr, ptr + 7168, len - 7168);
530 
531  return 0;
532 }
533 
534 static int moxa_real_load_code(struct moxa_board_conf *brd, const void *ptr,
535  size_t len)
536 {
537  void __iomem *baseAddr = brd->basemem;
538  const __le16 *uptr = ptr;
539  size_t wlen, len2, j;
540  unsigned long key, loadbuf, loadlen, checksum, checksum_ok;
541  unsigned int i, retry;
542  u16 usum, keycode;
543 
544  keycode = (brd->boardType == MOXA_BOARD_CP204J) ? CP204J_KeyCode :
545  C218_KeyCode;
546 
547  switch (brd->boardType) {
548  case MOXA_BOARD_CP204J:
549  case MOXA_BOARD_C218_ISA:
550  case MOXA_BOARD_C218_PCI:
551  key = C218_key;
552  loadbuf = C218_LoadBuf;
553  loadlen = C218DLoad_len;
554  checksum = C218check_sum;
555  checksum_ok = C218chksum_ok;
556  break;
557  default:
558  key = C320_key;
559  keycode = C320_KeyCode;
560  loadbuf = C320_LoadBuf;
561  loadlen = C320DLoad_len;
562  checksum = C320check_sum;
563  checksum_ok = C320chksum_ok;
564  break;
565  }
566 
567  usum = 0;
568  wlen = len >> 1;
569  for (i = 0; i < wlen; i++)
570  usum += le16_to_cpu(uptr[i]);
571  retry = 0;
572  do {
573  wlen = len >> 1;
574  j = 0;
575  while (wlen) {
576  len2 = (wlen > 2048) ? 2048 : wlen;
577  wlen -= len2;
578  memcpy_toio(baseAddr + loadbuf, ptr + j, len2 << 1);
579  j += len2 << 1;
580 
581  writew(len2, baseAddr + loadlen);
582  writew(0, baseAddr + key);
583  for (i = 0; i < 100; i++) {
584  if (readw(baseAddr + key) == keycode)
585  break;
586  msleep(10);
587  }
588  if (readw(baseAddr + key) != keycode)
589  return -EIO;
590  }
591  writew(0, baseAddr + loadlen);
592  writew(usum, baseAddr + checksum);
593  writew(0, baseAddr + key);
594  for (i = 0; i < 100; i++) {
595  if (readw(baseAddr + key) == keycode)
596  break;
597  msleep(10);
598  }
599  retry++;
600  } while ((readb(baseAddr + checksum_ok) != 1) && (retry < 3));
601  if (readb(baseAddr + checksum_ok) != 1)
602  return -EIO;
603 
604  writew(0, baseAddr + key);
605  for (i = 0; i < 600; i++) {
606  if (readw(baseAddr + Magic_no) == Magic_code)
607  break;
608  msleep(10);
609  }
610  if (readw(baseAddr + Magic_no) != Magic_code)
611  return -EIO;
612 
613  if (MOXA_IS_320(brd)) {
614  if (brd->busType == MOXA_BUS_TYPE_PCI) { /* ASIC board */
615  writew(0x3800, baseAddr + TMS320_PORT1);
616  writew(0x3900, baseAddr + TMS320_PORT2);
617  writew(28499, baseAddr + TMS320_CLOCK);
618  } else {
619  writew(0x3200, baseAddr + TMS320_PORT1);
620  writew(0x3400, baseAddr + TMS320_PORT2);
621  writew(19999, baseAddr + TMS320_CLOCK);
622  }
623  }
624  writew(1, baseAddr + Disable_IRQ);
625  writew(0, baseAddr + Magic_no);
626  for (i = 0; i < 500; i++) {
627  if (readw(baseAddr + Magic_no) == Magic_code)
628  break;
629  msleep(10);
630  }
631  if (readw(baseAddr + Magic_no) != Magic_code)
632  return -EIO;
633 
634  if (MOXA_IS_320(brd)) {
635  j = readw(baseAddr + Module_cnt);
636  if (j <= 0)
637  return -EIO;
638  brd->numPorts = j * 8;
639  writew(j, baseAddr + Module_no);
640  writew(0, baseAddr + Magic_no);
641  for (i = 0; i < 600; i++) {
642  if (readw(baseAddr + Magic_no) == Magic_code)
643  break;
644  msleep(10);
645  }
646  if (readw(baseAddr + Magic_no) != Magic_code)
647  return -EIO;
648  }
649  brd->intNdx = baseAddr + IRQindex;
650  brd->intPend = baseAddr + IRQpending;
651  brd->intTable = baseAddr + IRQtable;
652 
653  return 0;
654 }
655 
656 static int moxa_load_code(struct moxa_board_conf *brd, const void *ptr,
657  size_t len)
658 {
659  void __iomem *ofsAddr, *baseAddr = brd->basemem;
660  struct moxa_port *port;
661  int retval, i;
662 
663  if (len % 2) {
664  printk(KERN_ERR "MOXA: bios length is not even\n");
665  return -EINVAL;
666  }
667 
668  retval = moxa_real_load_code(brd, ptr, len); /* may change numPorts */
669  if (retval)
670  return retval;
671 
672  switch (brd->boardType) {
673  case MOXA_BOARD_C218_ISA:
674  case MOXA_BOARD_C218_PCI:
675  case MOXA_BOARD_CP204J:
676  port = brd->ports;
677  for (i = 0; i < brd->numPorts; i++, port++) {
678  port->board = brd;
679  port->DCDState = 0;
680  port->tableAddr = baseAddr + Extern_table +
681  Extern_size * i;
682  ofsAddr = port->tableAddr;
683  writew(C218rx_mask, ofsAddr + RX_mask);
684  writew(C218tx_mask, ofsAddr + TX_mask);
685  writew(C218rx_spage + i * C218buf_pageno, ofsAddr + Page_rxb);
686  writew(readw(ofsAddr + Page_rxb) + C218rx_pageno, ofsAddr + EndPage_rxb);
687 
688  writew(C218tx_spage + i * C218buf_pageno, ofsAddr + Page_txb);
689  writew(readw(ofsAddr + Page_txb) + C218tx_pageno, ofsAddr + EndPage_txb);
690 
691  }
692  break;
693  default:
694  port = brd->ports;
695  for (i = 0; i < brd->numPorts; i++, port++) {
696  port->board = brd;
697  port->DCDState = 0;
698  port->tableAddr = baseAddr + Extern_table +
699  Extern_size * i;
700  ofsAddr = port->tableAddr;
701  switch (brd->numPorts) {
702  case 8:
703  writew(C320p8rx_mask, ofsAddr + RX_mask);
704  writew(C320p8tx_mask, ofsAddr + TX_mask);
705  writew(C320p8rx_spage + i * C320p8buf_pgno, ofsAddr + Page_rxb);
706  writew(readw(ofsAddr + Page_rxb) + C320p8rx_pgno, ofsAddr + EndPage_rxb);
707  writew(C320p8tx_spage + i * C320p8buf_pgno, ofsAddr + Page_txb);
708  writew(readw(ofsAddr + Page_txb) + C320p8tx_pgno, ofsAddr + EndPage_txb);
709 
710  break;
711  case 16:
712  writew(C320p16rx_mask, ofsAddr + RX_mask);
713  writew(C320p16tx_mask, ofsAddr + TX_mask);
714  writew(C320p16rx_spage + i * C320p16buf_pgno, ofsAddr + Page_rxb);
715  writew(readw(ofsAddr + Page_rxb) + C320p16rx_pgno, ofsAddr + EndPage_rxb);
716  writew(C320p16tx_spage + i * C320p16buf_pgno, ofsAddr + Page_txb);
717  writew(readw(ofsAddr + Page_txb) + C320p16tx_pgno, ofsAddr + EndPage_txb);
718  break;
719 
720  case 24:
721  writew(C320p24rx_mask, ofsAddr + RX_mask);
722  writew(C320p24tx_mask, ofsAddr + TX_mask);
723  writew(C320p24rx_spage + i * C320p24buf_pgno, ofsAddr + Page_rxb);
724  writew(readw(ofsAddr + Page_rxb) + C320p24rx_pgno, ofsAddr + EndPage_rxb);
725  writew(C320p24tx_spage + i * C320p24buf_pgno, ofsAddr + Page_txb);
726  writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
727  break;
728  case 32:
729  writew(C320p32rx_mask, ofsAddr + RX_mask);
730  writew(C320p32tx_mask, ofsAddr + TX_mask);
731  writew(C320p32tx_ofs, ofsAddr + Ofs_txb);
732  writew(C320p32rx_spage + i * C320p32buf_pgno, ofsAddr + Page_rxb);
733  writew(readb(ofsAddr + Page_rxb), ofsAddr + EndPage_rxb);
734  writew(C320p32tx_spage + i * C320p32buf_pgno, ofsAddr + Page_txb);
735  writew(readw(ofsAddr + Page_txb), ofsAddr + EndPage_txb);
736  break;
737  }
738  }
739  break;
740  }
741  return 0;
742 }
743 
744 static int moxa_load_fw(struct moxa_board_conf *brd, const struct firmware *fw)
745 {
746  const void *ptr = fw->data;
747  char rsn[64];
748  u16 lens[5];
749  size_t len;
750  unsigned int a, lenp, lencnt;
751  int ret = -EINVAL;
752  struct {
753  __le32 magic; /* 0x34303430 */
754  u8 reserved1[2];
755  u8 type; /* UNIX = 3 */
756  u8 model; /* C218T=1, C320T=2, CP204=3 */
757  u8 reserved2[8];
758  __le16 len[5];
759  } const *hdr = ptr;
760 
761  BUILD_BUG_ON(ARRAY_SIZE(hdr->len) != ARRAY_SIZE(lens));
762 
763  if (fw->size < MOXA_FW_HDRLEN) {
764  strcpy(rsn, "too short (even header won't fit)");
765  goto err;
766  }
767  if (hdr->magic != cpu_to_le32(0x30343034)) {
768  sprintf(rsn, "bad magic: %.8x", le32_to_cpu(hdr->magic));
769  goto err;
770  }
771  if (hdr->type != 3) {
772  sprintf(rsn, "not for linux, type is %u", hdr->type);
773  goto err;
774  }
775  if (moxa_check_fw_model(brd, hdr->model)) {
776  sprintf(rsn, "not for this card, model is %u", hdr->model);
777  goto err;
778  }
779 
780  len = MOXA_FW_HDRLEN;
781  lencnt = hdr->model == 2 ? 5 : 3;
782  for (a = 0; a < ARRAY_SIZE(lens); a++) {
783  lens[a] = le16_to_cpu(hdr->len[a]);
784  if (lens[a] && len + lens[a] <= fw->size &&
785  moxa_check_fw(&fw->data[len]))
786  printk(KERN_WARNING "MOXA firmware: unexpected input "
787  "at offset %u, but going on\n", (u32)len);
788  if (!lens[a] && a < lencnt) {
789  sprintf(rsn, "too few entries in fw file");
790  goto err;
791  }
792  len += lens[a];
793  }
794 
795  if (len != fw->size) {
796  sprintf(rsn, "bad length: %u (should be %u)", (u32)fw->size,
797  (u32)len);
798  goto err;
799  }
800 
801  ptr += MOXA_FW_HDRLEN;
802  lenp = 0; /* bios */
803 
804  strcpy(rsn, "read above");
805 
806  ret = moxa_load_bios(brd, ptr, lens[lenp]);
807  if (ret)
808  goto err;
809 
810  /* we skip the tty section (lens[1]), since we don't need it */
811  ptr += lens[lenp] + lens[lenp + 1];
812  lenp += 2; /* comm */
813 
814  if (hdr->model == 2) {
815  ret = moxa_load_320b(brd, ptr, lens[lenp]);
816  if (ret)
817  goto err;
818  /* skip another tty */
819  ptr += lens[lenp] + lens[lenp + 1];
820  lenp += 2;
821  }
822 
823  ret = moxa_load_code(brd, ptr, lens[lenp]);
824  if (ret)
825  goto err;
826 
827  return 0;
828 err:
829  printk(KERN_ERR "firmware failed to load, reason: %s\n", rsn);
830  return ret;
831 }
832 
833 static int moxa_init_board(struct moxa_board_conf *brd, struct device *dev)
834 {
835  const struct firmware *fw;
836  const char *file;
837  struct moxa_port *p;
838  unsigned int i, first_idx;
839  int ret;
840 
841  brd->ports = kcalloc(MAX_PORTS_PER_BOARD, sizeof(*brd->ports),
842  GFP_KERNEL);
843  if (brd->ports == NULL) {
844  printk(KERN_ERR "cannot allocate memory for ports\n");
845  ret = -ENOMEM;
846  goto err;
847  }
848 
849  for (i = 0, p = brd->ports; i < MAX_PORTS_PER_BOARD; i++, p++) {
850  tty_port_init(&p->port);
851  p->port.ops = &moxa_port_ops;
852  p->type = PORT_16550A;
853  p->cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
854  }
855 
856  switch (brd->boardType) {
857  case MOXA_BOARD_C218_ISA:
858  case MOXA_BOARD_C218_PCI:
859  file = "c218tunx.cod";
860  break;
861  case MOXA_BOARD_CP204J:
862  file = "cp204unx.cod";
863  break;
864  default:
865  file = "c320tunx.cod";
866  break;
867  }
868 
869  ret = request_firmware(&fw, file, dev);
870  if (ret) {
871  printk(KERN_ERR "MOXA: request_firmware failed. Make sure "
872  "you've placed '%s' file into your firmware "
873  "loader directory (e.g. /lib/firmware)\n",
874  file);
875  goto err_free;
876  }
877 
878  ret = moxa_load_fw(brd, fw);
879 
880  release_firmware(fw);
881 
882  if (ret)
883  goto err_free;
884 
885  spin_lock_bh(&moxa_lock);
886  brd->ready = 1;
887  if (!timer_pending(&moxaTimer))
888  mod_timer(&moxaTimer, jiffies + HZ / 50);
889  spin_unlock_bh(&moxa_lock);
890 
891  first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
892  for (i = 0; i < brd->numPorts; i++)
893  tty_port_register_device(&brd->ports[i].port, moxaDriver,
894  first_idx + i, dev);
895 
896  return 0;
897 err_free:
898  kfree(brd->ports);
899 err:
900  return ret;
901 }
902 
903 static void moxa_board_deinit(struct moxa_board_conf *brd)
904 {
905  unsigned int a, opened, first_idx;
906 
907  mutex_lock(&moxa_openlock);
908  spin_lock_bh(&moxa_lock);
909  brd->ready = 0;
910  spin_unlock_bh(&moxa_lock);
911 
912  /* pci hot-un-plug support */
913  for (a = 0; a < brd->numPorts; a++)
914  if (brd->ports[a].port.flags & ASYNC_INITIALIZED) {
915  struct tty_struct *tty = tty_port_tty_get(
916  &brd->ports[a].port);
917  if (tty) {
918  tty_hangup(tty);
919  tty_kref_put(tty);
920  }
921  }
922  while (1) {
923  opened = 0;
924  for (a = 0; a < brd->numPorts; a++)
925  if (brd->ports[a].port.flags & ASYNC_INITIALIZED)
926  opened++;
927  mutex_unlock(&moxa_openlock);
928  if (!opened)
929  break;
930  msleep(50);
931  mutex_lock(&moxa_openlock);
932  }
933 
934  first_idx = (brd - moxa_boards) * MAX_PORTS_PER_BOARD;
935  for (a = 0; a < brd->numPorts; a++)
936  tty_unregister_device(moxaDriver, first_idx + a);
937 
938  iounmap(brd->basemem);
939  brd->basemem = NULL;
940  kfree(brd->ports);
941 }
942 
943 #ifdef CONFIG_PCI
944 static int __devinit moxa_pci_probe(struct pci_dev *pdev,
945  const struct pci_device_id *ent)
946 {
947  struct moxa_board_conf *board;
948  unsigned int i;
949  int board_type = ent->driver_data;
950  int retval;
951 
952  retval = pci_enable_device(pdev);
953  if (retval) {
954  dev_err(&pdev->dev, "can't enable pci device\n");
955  goto err;
956  }
957 
958  for (i = 0; i < MAX_BOARDS; i++)
959  if (moxa_boards[i].basemem == NULL)
960  break;
961 
962  retval = -ENODEV;
963  if (i >= MAX_BOARDS) {
964  dev_warn(&pdev->dev, "more than %u MOXA Intellio family boards "
965  "found. Board is ignored.\n", MAX_BOARDS);
966  goto err;
967  }
968 
969  board = &moxa_boards[i];
970 
971  retval = pci_request_region(pdev, 2, "moxa-base");
972  if (retval) {
973  dev_err(&pdev->dev, "can't request pci region 2\n");
974  goto err;
975  }
976 
977  board->basemem = ioremap_nocache(pci_resource_start(pdev, 2), 0x4000);
978  if (board->basemem == NULL) {
979  dev_err(&pdev->dev, "can't remap io space 2\n");
980  retval = -ENOMEM;
981  goto err_reg;
982  }
983 
984  board->boardType = board_type;
985  switch (board_type) {
986  case MOXA_BOARD_C218_ISA:
987  case MOXA_BOARD_C218_PCI:
988  board->numPorts = 8;
989  break;
990 
991  case MOXA_BOARD_CP204J:
992  board->numPorts = 4;
993  break;
994  default:
995  board->numPorts = 0;
996  break;
997  }
998  board->busType = MOXA_BUS_TYPE_PCI;
999 
1000  retval = moxa_init_board(board, &pdev->dev);
1001  if (retval)
1002  goto err_base;
1003 
1004  pci_set_drvdata(pdev, board);
1005 
1006  dev_info(&pdev->dev, "board '%s' ready (%u ports, firmware loaded)\n",
1007  moxa_brdname[board_type - 1], board->numPorts);
1008 
1009  return 0;
1010 err_base:
1011  iounmap(board->basemem);
1012  board->basemem = NULL;
1013 err_reg:
1014  pci_release_region(pdev, 2);
1015 err:
1016  return retval;
1017 }
1018 
1019 static void __devexit moxa_pci_remove(struct pci_dev *pdev)
1020 {
1021  struct moxa_board_conf *brd = pci_get_drvdata(pdev);
1022 
1023  moxa_board_deinit(brd);
1024 
1025  pci_release_region(pdev, 2);
1026 }
1027 
1028 static struct pci_driver moxa_pci_driver = {
1029  .name = "moxa",
1030  .id_table = moxa_pcibrds,
1031  .probe = moxa_pci_probe,
1032  .remove = __devexit_p(moxa_pci_remove)
1033 };
1034 #endif /* CONFIG_PCI */
1035 
1036 static int __init moxa_init(void)
1037 {
1038  unsigned int isabrds = 0;
1039  int retval = 0;
1040  struct moxa_board_conf *brd = moxa_boards;
1041  unsigned int i;
1042 
1043  printk(KERN_INFO "MOXA Intellio family driver version %s\n",
1044  MOXA_VERSION);
1045 
1046  tty_port_init(&moxa_service_port);
1047 
1048  moxaDriver = tty_alloc_driver(MAX_PORTS + 1,
1049  TTY_DRIVER_REAL_RAW |
1050  TTY_DRIVER_DYNAMIC_DEV);
1051  if (IS_ERR(moxaDriver))
1052  return PTR_ERR(moxaDriver);
1053 
1054  moxaDriver->name = "ttyMX";
1055  moxaDriver->major = ttymajor;
1056  moxaDriver->minor_start = 0;
1057  moxaDriver->type = TTY_DRIVER_TYPE_SERIAL;
1058  moxaDriver->subtype = SERIAL_TYPE_NORMAL;
1059  moxaDriver->init_termios = tty_std_termios;
1060  moxaDriver->init_termios.c_cflag = B9600 | CS8 | CREAD | CLOCAL | HUPCL;
1061  moxaDriver->init_termios.c_ispeed = 9600;
1062  moxaDriver->init_termios.c_ospeed = 9600;
1063  tty_set_operations(moxaDriver, &moxa_ops);
1064  /* Having one more port only for ioctls is ugly */
1065  tty_port_link_device(&moxa_service_port, moxaDriver, MAX_PORTS);
1066 
1067  if (tty_register_driver(moxaDriver)) {
1068  printk(KERN_ERR "can't register MOXA Smartio tty driver!\n");
1069  put_tty_driver(moxaDriver);
1070  return -1;
1071  }
1072 
1073  /* Find the boards defined from module args. */
1074 
1075  for (i = 0; i < MAX_BOARDS; i++) {
1076  if (!baseaddr[i])
1077  break;
1078  if (type[i] == MOXA_BOARD_C218_ISA ||
1079  type[i] == MOXA_BOARD_C320_ISA) {
1080  pr_debug("Moxa board %2d: %s board(baseAddr=%lx)\n",
1081  isabrds + 1, moxa_brdname[type[i] - 1],
1082  baseaddr[i]);
1083  brd->boardType = type[i];
1084  brd->numPorts = type[i] == MOXA_BOARD_C218_ISA ? 8 :
1085  numports[i];
1086  brd->busType = MOXA_BUS_TYPE_ISA;
1087  brd->basemem = ioremap_nocache(baseaddr[i], 0x4000);
1088  if (!brd->basemem) {
1089  printk(KERN_ERR "MOXA: can't remap %lx\n",
1090  baseaddr[i]);
1091  continue;
1092  }
1093  if (moxa_init_board(brd, NULL)) {
1094  iounmap(brd->basemem);
1095  brd->basemem = NULL;
1096  continue;
1097  }
1098 
1099  printk(KERN_INFO "MOXA isa board found at 0x%.8lu and "
1100  "ready (%u ports, firmware loaded)\n",
1101  baseaddr[i], brd->numPorts);
1102 
1103  brd++;
1104  isabrds++;
1105  }
1106  }
1107 
1108 #ifdef CONFIG_PCI
1109  retval = pci_register_driver(&moxa_pci_driver);
1110  if (retval) {
1111  printk(KERN_ERR "Can't register MOXA pci driver!\n");
1112  if (isabrds)
1113  retval = 0;
1114  }
1115 #endif
1116 
1117  return retval;
1118 }
1119 
1120 static void __exit moxa_exit(void)
1121 {
1122  unsigned int i;
1123 
1124 #ifdef CONFIG_PCI
1125  pci_unregister_driver(&moxa_pci_driver);
1126 #endif
1127 
1128  for (i = 0; i < MAX_BOARDS; i++) /* ISA boards */
1129  if (moxa_boards[i].ready)
1130  moxa_board_deinit(&moxa_boards[i]);
1131 
1132  del_timer_sync(&moxaTimer);
1133 
1134  if (tty_unregister_driver(moxaDriver))
1135  printk(KERN_ERR "Couldn't unregister MOXA Intellio family "
1136  "serial driver\n");
1137  put_tty_driver(moxaDriver);
1138 }
1139 
1140 module_init(moxa_init);
1141 module_exit(moxa_exit);
1142 
1143 static void moxa_shutdown(struct tty_port *port)
1144 {
1145  struct moxa_port *ch = container_of(port, struct moxa_port, port);
1146  MoxaPortDisable(ch);
1147  MoxaPortFlushData(ch, 2);
1148 }
1149 
1150 static int moxa_carrier_raised(struct tty_port *port)
1151 {
1152  struct moxa_port *ch = container_of(port, struct moxa_port, port);
1153  int dcd;
1154 
1155  spin_lock_irq(&port->lock);
1156  dcd = ch->DCDState;
1157  spin_unlock_irq(&port->lock);
1158  return dcd;
1159 }
1160 
1161 static void moxa_dtr_rts(struct tty_port *port, int onoff)
1162 {
1163  struct moxa_port *ch = container_of(port, struct moxa_port, port);
1164  MoxaPortLineCtrl(ch, onoff, onoff);
1165 }
1166 
1167 
1168 static int moxa_open(struct tty_struct *tty, struct file *filp)
1169 {
1170  struct moxa_board_conf *brd;
1171  struct moxa_port *ch;
1172  int port;
1173 
1174  port = tty->index;
1175  if (port == MAX_PORTS) {
1176  return capable(CAP_SYS_ADMIN) ? 0 : -EPERM;
1177  }
1178  if (mutex_lock_interruptible(&moxa_openlock))
1179  return -ERESTARTSYS;
1180  brd = &moxa_boards[port / MAX_PORTS_PER_BOARD];
1181  if (!brd->ready) {
1182  mutex_unlock(&moxa_openlock);
1183  return -ENODEV;
1184  }
1185 
1186  if (port % MAX_PORTS_PER_BOARD >= brd->numPorts) {
1187  mutex_unlock(&moxa_openlock);
1188  return -ENODEV;
1189  }
1190 
1191  ch = &brd->ports[port % MAX_PORTS_PER_BOARD];
1192  ch->port.count++;
1193  tty->driver_data = ch;
1194  tty_port_tty_set(&ch->port, tty);
1195  mutex_lock(&ch->port.mutex);
1196  if (!(ch->port.flags & ASYNC_INITIALIZED)) {
1197  ch->statusflags = 0;
1198  moxa_set_tty_param(tty, &tty->termios);
1199  MoxaPortLineCtrl(ch, 1, 1);
1200  MoxaPortEnable(ch);
1201  MoxaSetFifo(ch, ch->type == PORT_16550A);
1202  ch->port.flags |= ASYNC_INITIALIZED;
1203  }
1204  mutex_unlock(&ch->port.mutex);
1205  mutex_unlock(&moxa_openlock);
1206 
1207  return tty_port_block_til_ready(&ch->port, tty, filp);
1208 }
1209 
1210 static void moxa_close(struct tty_struct *tty, struct file *filp)
1211 {
1212  struct moxa_port *ch = tty->driver_data;
1213  ch->cflag = tty->termios.c_cflag;
1214  tty_port_close(&ch->port, tty, filp);
1215 }
1216 
1217 static int moxa_write(struct tty_struct *tty,
1218  const unsigned char *buf, int count)
1219 {
1220  struct moxa_port *ch = tty->driver_data;
1221  unsigned long flags;
1222  int len;
1223 
1224  if (ch == NULL)
1225  return 0;
1226 
1227  spin_lock_irqsave(&moxa_lock, flags);
1228  len = MoxaPortWriteData(tty, buf, count);
1229  spin_unlock_irqrestore(&moxa_lock, flags);
1230 
1231  set_bit(LOWWAIT, &ch->statusflags);
1232  return len;
1233 }
1234 
1235 static int moxa_write_room(struct tty_struct *tty)
1236 {
1237  struct moxa_port *ch;
1238 
1239  if (tty->stopped)
1240  return 0;
1241  ch = tty->driver_data;
1242  if (ch == NULL)
1243  return 0;
1244  return MoxaPortTxFree(ch);
1245 }
1246 
1247 static void moxa_flush_buffer(struct tty_struct *tty)
1248 {
1249  struct moxa_port *ch = tty->driver_data;
1250 
1251  if (ch == NULL)
1252  return;
1253  MoxaPortFlushData(ch, 1);
1254  tty_wakeup(tty);
1255 }
1256 
1257 static int moxa_chars_in_buffer(struct tty_struct *tty)
1258 {
1259  struct moxa_port *ch = tty->driver_data;
1260  int chars;
1261 
1262  chars = MoxaPortTxQueue(ch);
1263  if (chars)
1264  /*
1265  * Make it possible to wakeup anything waiting for output
1266  * in tty_ioctl.c, etc.
1267  */
1268  set_bit(EMPTYWAIT, &ch->statusflags);
1269  return chars;
1270 }
1271 
1272 static int moxa_tiocmget(struct tty_struct *tty)
1273 {
1274  struct moxa_port *ch = tty->driver_data;
1275  int flag = 0, dtr, rts;
1276 
1277  MoxaPortGetLineOut(ch, &dtr, &rts);
1278  if (dtr)
1279  flag |= TIOCM_DTR;
1280  if (rts)
1281  flag |= TIOCM_RTS;
1282  dtr = MoxaPortLineStatus(ch);
1283  if (dtr & 1)
1284  flag |= TIOCM_CTS;
1285  if (dtr & 2)
1286  flag |= TIOCM_DSR;
1287  if (dtr & 4)
1288  flag |= TIOCM_CD;
1289  return flag;
1290 }
1291 
1292 static int moxa_tiocmset(struct tty_struct *tty,
1293  unsigned int set, unsigned int clear)
1294 {
1295  struct moxa_port *ch;
1296  int dtr, rts;
1297 
1298  mutex_lock(&moxa_openlock);
1299  ch = tty->driver_data;
1300  if (!ch) {
1301  mutex_unlock(&moxa_openlock);
1302  return -EINVAL;
1303  }
1304 
1305  MoxaPortGetLineOut(ch, &dtr, &rts);
1306  if (set & TIOCM_RTS)
1307  rts = 1;
1308  if (set & TIOCM_DTR)
1309  dtr = 1;
1310  if (clear & TIOCM_RTS)
1311  rts = 0;
1312  if (clear & TIOCM_DTR)
1313  dtr = 0;
1314  MoxaPortLineCtrl(ch, dtr, rts);
1315  mutex_unlock(&moxa_openlock);
1316  return 0;
1317 }
1318 
1319 static void moxa_set_termios(struct tty_struct *tty,
1320  struct ktermios *old_termios)
1321 {
1322  struct moxa_port *ch = tty->driver_data;
1323 
1324  if (ch == NULL)
1325  return;
1326  moxa_set_tty_param(tty, old_termios);
1327  if (!(old_termios->c_cflag & CLOCAL) && C_CLOCAL(tty))
1328  wake_up_interruptible(&ch->port.open_wait);
1329 }
1330 
1331 static void moxa_stop(struct tty_struct *tty)
1332 {
1333  struct moxa_port *ch = tty->driver_data;
1334 
1335  if (ch == NULL)
1336  return;
1337  MoxaPortTxDisable(ch);
1338  set_bit(TXSTOPPED, &ch->statusflags);
1339 }
1340 
1341 
1342 static void moxa_start(struct tty_struct *tty)
1343 {
1344  struct moxa_port *ch = tty->driver_data;
1345 
1346  if (ch == NULL)
1347  return;
1348 
1349  if (!test_bit(TXSTOPPED, &ch->statusflags))
1350  return;
1351 
1352  MoxaPortTxEnable(ch);
1353  clear_bit(TXSTOPPED, &ch->statusflags);
1354 }
1355 
1356 static void moxa_hangup(struct tty_struct *tty)
1357 {
1358  struct moxa_port *ch = tty->driver_data;
1359  tty_port_hangup(&ch->port);
1360 }
1361 
1362 static void moxa_new_dcdstate(struct moxa_port *p, u8 dcd)
1363 {
1364  struct tty_struct *tty;
1365  unsigned long flags;
1366  dcd = !!dcd;
1367 
1368  spin_lock_irqsave(&p->port.lock, flags);
1369  if (dcd != p->DCDState) {
1370  p->DCDState = dcd;
1371  spin_unlock_irqrestore(&p->port.lock, flags);
1372  tty = tty_port_tty_get(&p->port);
1373  if (tty && C_CLOCAL(tty) && !dcd)
1374  tty_hangup(tty);
1375  tty_kref_put(tty);
1376  }
1377  else
1378  spin_unlock_irqrestore(&p->port.lock, flags);
1379 }
1380 
1381 static int moxa_poll_port(struct moxa_port *p, unsigned int handle,
1382  u16 __iomem *ip)
1383 {
1384  struct tty_struct *tty = tty_port_tty_get(&p->port);
1385  void __iomem *ofsAddr;
1386  unsigned int inited = p->port.flags & ASYNC_INITIALIZED;
1387  u16 intr;
1388 
1389  if (tty) {
1390  if (test_bit(EMPTYWAIT, &p->statusflags) &&
1391  MoxaPortTxQueue(p) == 0) {
1392  clear_bit(EMPTYWAIT, &p->statusflags);
1393  tty_wakeup(tty);
1394  }
1395  if (test_bit(LOWWAIT, &p->statusflags) && !tty->stopped &&
1396  MoxaPortTxQueue(p) <= WAKEUP_CHARS) {
1397  clear_bit(LOWWAIT, &p->statusflags);
1398  tty_wakeup(tty);
1399  }
1400 
1401  if (inited && !test_bit(TTY_THROTTLED, &tty->flags) &&
1402  MoxaPortRxQueue(p) > 0) { /* RX */
1403  MoxaPortReadData(p);
1404  tty_schedule_flip(tty);
1405  }
1406  } else {
1407  clear_bit(EMPTYWAIT, &p->statusflags);
1408  MoxaPortFlushData(p, 0); /* flush RX */
1409  }
1410 
1411  if (!handle) /* nothing else to do */
1412  goto put;
1413 
1414  intr = readw(ip); /* port irq status */
1415  if (intr == 0)
1416  goto put;
1417 
1418  writew(0, ip); /* ACK port */
1419  ofsAddr = p->tableAddr;
1420  if (intr & IntrTx) /* disable tx intr */
1421  writew(readw(ofsAddr + HostStat) & ~WakeupTx,
1422  ofsAddr + HostStat);
1423 
1424  if (!inited)
1425  goto put;
1426 
1427  if (tty && (intr & IntrBreak) && !I_IGNBRK(tty)) { /* BREAK */
1428  tty_insert_flip_char(tty, 0, TTY_BREAK);
1429  tty_schedule_flip(tty);
1430  }
1431 
1432  if (intr & IntrLine)
1433  moxa_new_dcdstate(p, readb(ofsAddr + FlagStat) & DCD_state);
1434 put:
1435  tty_kref_put(tty);
1436 
1437  return 0;
1438 }
1439 
1440 static void moxa_poll(unsigned long ignored)
1441 {
1442  struct moxa_board_conf *brd;
1443  u16 __iomem *ip;
1444  unsigned int card, port, served = 0;
1445 
1446  spin_lock(&moxa_lock);
1447  for (card = 0; card < MAX_BOARDS; card++) {
1448  brd = &moxa_boards[card];
1449  if (!brd->ready)
1450  continue;
1451 
1452  served++;
1453 
1454  ip = NULL;
1455  if (readb(brd->intPend) == 0xff)
1456  ip = brd->intTable + readb(brd->intNdx);
1457 
1458  for (port = 0; port < brd->numPorts; port++)
1459  moxa_poll_port(&brd->ports[port], !!ip, ip + port);
1460 
1461  if (ip)
1462  writeb(0, brd->intPend); /* ACK */
1463 
1464  if (moxaLowWaterChk) {
1465  struct moxa_port *p = brd->ports;
1466  for (port = 0; port < brd->numPorts; port++, p++)
1467  if (p->lowChkFlag) {
1468  p->lowChkFlag = 0;
1469  moxa_low_water_check(p->tableAddr);
1470  }
1471  }
1472  }
1473  moxaLowWaterChk = 0;
1474 
1475  if (served)
1476  mod_timer(&moxaTimer, jiffies + HZ / 50);
1477  spin_unlock(&moxa_lock);
1478 }
1479 
1480 /******************************************************************************/
1481 
1482 static void moxa_set_tty_param(struct tty_struct *tty, struct ktermios *old_termios)
1483 {
1484  register struct ktermios *ts = &tty->termios;
1485  struct moxa_port *ch = tty->driver_data;
1486  int rts, cts, txflow, rxflow, xany, baud;
1487 
1488  rts = cts = txflow = rxflow = xany = 0;
1489  if (ts->c_cflag & CRTSCTS)
1490  rts = cts = 1;
1491  if (ts->c_iflag & IXON)
1492  txflow = 1;
1493  if (ts->c_iflag & IXOFF)
1494  rxflow = 1;
1495  if (ts->c_iflag & IXANY)
1496  xany = 1;
1497 
1498  /* Clear the features we don't support */
1499  ts->c_cflag &= ~CMSPAR;
1500  MoxaPortFlowCtrl(ch, rts, cts, txflow, rxflow, xany);
1501  baud = MoxaPortSetTermio(ch, ts, tty_get_baud_rate(tty));
1502  if (baud == -1)
1503  baud = tty_termios_baud_rate(old_termios);
1504  /* Not put the baud rate into the termios data */
1505  tty_encode_baud_rate(tty, baud, baud);
1506 }
1507 
1508 /*****************************************************************************
1509  * Driver level functions: *
1510  *****************************************************************************/
1511 
1512 static void MoxaPortFlushData(struct moxa_port *port, int mode)
1513 {
1514  void __iomem *ofsAddr;
1515  if (mode < 0 || mode > 2)
1516  return;
1517  ofsAddr = port->tableAddr;
1518  moxafunc(ofsAddr, FC_FlushQueue, mode);
1519  if (mode != 1) {
1520  port->lowChkFlag = 0;
1521  moxa_low_water_check(ofsAddr);
1522  }
1523 }
1524 
1525 /*
1526  * Moxa Port Number Description:
1527  *
1528  * MOXA serial driver supports up to 4 MOXA-C218/C320 boards. And,
1529  * the port number using in MOXA driver functions will be 0 to 31 for
1530  * first MOXA board, 32 to 63 for second, 64 to 95 for third and 96
1531  * to 127 for fourth. For example, if you setup three MOXA boards,
1532  * first board is C218, second board is C320-16 and third board is
1533  * C320-32. The port number of first board (C218 - 8 ports) is from
1534  * 0 to 7. The port number of second board (C320 - 16 ports) is form
1535  * 32 to 47. The port number of third board (C320 - 32 ports) is from
1536  * 64 to 95. And those port numbers form 8 to 31, 48 to 63 and 96 to
1537  * 127 will be invalid.
1538  *
1539  *
1540  * Moxa Functions Description:
1541  *
1542  * Function 1: Driver initialization routine, this routine must be
1543  * called when initialized driver.
1544  * Syntax:
1545  * void MoxaDriverInit();
1546  *
1547  *
1548  * Function 2: Moxa driver private IOCTL command processing.
1549  * Syntax:
1550  * int MoxaDriverIoctl(unsigned int cmd, unsigned long arg, int port);
1551  *
1552  * unsigned int cmd : IOCTL command
1553  * unsigned long arg : IOCTL argument
1554  * int port : port number (0 - 127)
1555  *
1556  * return: 0 (OK)
1557  * -EINVAL
1558  * -ENOIOCTLCMD
1559  *
1560  *
1561  * Function 6: Enable this port to start Tx/Rx data.
1562  * Syntax:
1563  * void MoxaPortEnable(int port);
1564  * int port : port number (0 - 127)
1565  *
1566  *
1567  * Function 7: Disable this port
1568  * Syntax:
1569  * void MoxaPortDisable(int port);
1570  * int port : port number (0 - 127)
1571  *
1572  *
1573  * Function 10: Setting baud rate of this port.
1574  * Syntax:
1575  * speed_t MoxaPortSetBaud(int port, speed_t baud);
1576  * int port : port number (0 - 127)
1577  * long baud : baud rate (50 - 115200)
1578  *
1579  * return: 0 : this port is invalid or baud < 50
1580  * 50 - 115200 : the real baud rate set to the port, if
1581  * the argument baud is large than maximun
1582  * available baud rate, the real setting
1583  * baud rate will be the maximun baud rate.
1584  *
1585  *
1586  * Function 12: Configure the port.
1587  * Syntax:
1588  * int MoxaPortSetTermio(int port, struct ktermios *termio, speed_t baud);
1589  * int port : port number (0 - 127)
1590  * struct ktermios * termio : termio structure pointer
1591  * speed_t baud : baud rate
1592  *
1593  * return: -1 : this port is invalid or termio == NULL
1594  * 0 : setting O.K.
1595  *
1596  *
1597  * Function 13: Get the DTR/RTS state of this port.
1598  * Syntax:
1599  * int MoxaPortGetLineOut(int port, int *dtrState, int *rtsState);
1600  * int port : port number (0 - 127)
1601  * int * dtrState : pointer to INT to receive the current DTR
1602  * state. (if NULL, this function will not
1603  * write to this address)
1604  * int * rtsState : pointer to INT to receive the current RTS
1605  * state. (if NULL, this function will not
1606  * write to this address)
1607  *
1608  * return: -1 : this port is invalid
1609  * 0 : O.K.
1610  *
1611  *
1612  * Function 14: Setting the DTR/RTS output state of this port.
1613  * Syntax:
1614  * void MoxaPortLineCtrl(int port, int dtrState, int rtsState);
1615  * int port : port number (0 - 127)
1616  * int dtrState : DTR output state (0: off, 1: on)
1617  * int rtsState : RTS output state (0: off, 1: on)
1618  *
1619  *
1620  * Function 15: Setting the flow control of this port.
1621  * Syntax:
1622  * void MoxaPortFlowCtrl(int port, int rtsFlow, int ctsFlow, int rxFlow,
1623  * int txFlow,int xany);
1624  * int port : port number (0 - 127)
1625  * int rtsFlow : H/W RTS flow control (0: no, 1: yes)
1626  * int ctsFlow : H/W CTS flow control (0: no, 1: yes)
1627  * int rxFlow : S/W Rx XON/XOFF flow control (0: no, 1: yes)
1628  * int txFlow : S/W Tx XON/XOFF flow control (0: no, 1: yes)
1629  * int xany : S/W XANY flow control (0: no, 1: yes)
1630  *
1631  *
1632  * Function 16: Get ths line status of this port
1633  * Syntax:
1634  * int MoxaPortLineStatus(int port);
1635  * int port : port number (0 - 127)
1636  *
1637  * return: Bit 0 - CTS state (0: off, 1: on)
1638  * Bit 1 - DSR state (0: off, 1: on)
1639  * Bit 2 - DCD state (0: off, 1: on)
1640  *
1641  *
1642  * Function 19: Flush the Rx/Tx buffer data of this port.
1643  * Syntax:
1644  * void MoxaPortFlushData(int port, int mode);
1645  * int port : port number (0 - 127)
1646  * int mode
1647  * 0 : flush the Rx buffer
1648  * 1 : flush the Tx buffer
1649  * 2 : flush the Rx and Tx buffer
1650  *
1651  *
1652  * Function 20: Write data.
1653  * Syntax:
1654  * int MoxaPortWriteData(int port, unsigned char * buffer, int length);
1655  * int port : port number (0 - 127)
1656  * unsigned char * buffer : pointer to write data buffer.
1657  * int length : write data length
1658  *
1659  * return: 0 - length : real write data length
1660  *
1661  *
1662  * Function 21: Read data.
1663  * Syntax:
1664  * int MoxaPortReadData(int port, struct tty_struct *tty);
1665  * int port : port number (0 - 127)
1666  * struct tty_struct *tty : tty for data
1667  *
1668  * return: 0 - length : real read data length
1669  *
1670  *
1671  * Function 24: Get the Tx buffer current queued data bytes
1672  * Syntax:
1673  * int MoxaPortTxQueue(int port);
1674  * int port : port number (0 - 127)
1675  *
1676  * return: .. : Tx buffer current queued data bytes
1677  *
1678  *
1679  * Function 25: Get the Tx buffer current free space
1680  * Syntax:
1681  * int MoxaPortTxFree(int port);
1682  * int port : port number (0 - 127)
1683  *
1684  * return: .. : Tx buffer current free space
1685  *
1686  *
1687  * Function 26: Get the Rx buffer current queued data bytes
1688  * Syntax:
1689  * int MoxaPortRxQueue(int port);
1690  * int port : port number (0 - 127)
1691  *
1692  * return: .. : Rx buffer current queued data bytes
1693  *
1694  *
1695  * Function 28: Disable port data transmission.
1696  * Syntax:
1697  * void MoxaPortTxDisable(int port);
1698  * int port : port number (0 - 127)
1699  *
1700  *
1701  * Function 29: Enable port data transmission.
1702  * Syntax:
1703  * void MoxaPortTxEnable(int port);
1704  * int port : port number (0 - 127)
1705  *
1706  *
1707  * Function 31: Get the received BREAK signal count and reset it.
1708  * Syntax:
1709  * int MoxaPortResetBrkCnt(int port);
1710  * int port : port number (0 - 127)
1711  *
1712  * return: 0 - .. : BREAK signal count
1713  *
1714  *
1715  */
1716 
1717 static void MoxaPortEnable(struct moxa_port *port)
1718 {
1719  void __iomem *ofsAddr;
1720  u16 lowwater = 512;
1721 
1722  ofsAddr = port->tableAddr;
1723  writew(lowwater, ofsAddr + Low_water);
1724  if (MOXA_IS_320(port->board))
1725  moxafunc(ofsAddr, FC_SetBreakIrq, 0);
1726  else
1727  writew(readw(ofsAddr + HostStat) | WakeupBreak,
1728  ofsAddr + HostStat);
1729 
1730  moxafunc(ofsAddr, FC_SetLineIrq, Magic_code);
1731  moxafunc(ofsAddr, FC_FlushQueue, 2);
1732 
1733  moxafunc(ofsAddr, FC_EnableCH, Magic_code);
1734  MoxaPortLineStatus(port);
1735 }
1736 
1737 static void MoxaPortDisable(struct moxa_port *port)
1738 {
1739  void __iomem *ofsAddr = port->tableAddr;
1740 
1741  moxafunc(ofsAddr, FC_SetFlowCtl, 0); /* disable flow control */
1742  moxafunc(ofsAddr, FC_ClrLineIrq, Magic_code);
1743  writew(0, ofsAddr + HostStat);
1744  moxafunc(ofsAddr, FC_DisableCH, Magic_code);
1745 }
1746 
1747 static speed_t MoxaPortSetBaud(struct moxa_port *port, speed_t baud)
1748 {
1749  void __iomem *ofsAddr = port->tableAddr;
1750  unsigned int clock, val;
1751  speed_t max;
1752 
1753  max = MOXA_IS_320(port->board) ? 460800 : 921600;
1754  if (baud < 50)
1755  return 0;
1756  if (baud > max)
1757  baud = max;
1758  clock = 921600;
1759  val = clock / baud;
1760  moxafunc(ofsAddr, FC_SetBaud, val);
1761  baud = clock / val;
1762  return baud;
1763 }
1764 
1765 static int MoxaPortSetTermio(struct moxa_port *port, struct ktermios *termio,
1766  speed_t baud)
1767 {
1768  void __iomem *ofsAddr;
1769  tcflag_t mode = 0;
1770 
1771  ofsAddr = port->tableAddr;
1772 
1773  mode = termio->c_cflag & CSIZE;
1774  if (mode == CS5)
1775  mode = MX_CS5;
1776  else if (mode == CS6)
1777  mode = MX_CS6;
1778  else if (mode == CS7)
1779  mode = MX_CS7;
1780  else if (mode == CS8)
1781  mode = MX_CS8;
1782 
1783  if (termio->c_cflag & CSTOPB) {
1784  if (mode == MX_CS5)
1785  mode |= MX_STOP15;
1786  else
1787  mode |= MX_STOP2;
1788  } else
1789  mode |= MX_STOP1;
1790 
1791  if (termio->c_cflag & PARENB) {
1792  if (termio->c_cflag & PARODD)
1793  mode |= MX_PARODD;
1794  else
1795  mode |= MX_PAREVEN;
1796  } else
1797  mode |= MX_PARNONE;
1798 
1799  moxafunc(ofsAddr, FC_SetDataMode, (u16)mode);
1800 
1801  if (MOXA_IS_320(port->board) && baud >= 921600)
1802  return -1;
1803 
1804  baud = MoxaPortSetBaud(port, baud);
1805 
1806  if (termio->c_iflag & (IXON | IXOFF | IXANY)) {
1807  spin_lock_irq(&moxafunc_lock);
1808  writeb(termio->c_cc[VSTART], ofsAddr + FuncArg);
1809  writeb(termio->c_cc[VSTOP], ofsAddr + FuncArg1);
1810  writeb(FC_SetXonXoff, ofsAddr + FuncCode);
1811  moxa_wait_finish(ofsAddr);
1812  spin_unlock_irq(&moxafunc_lock);
1813 
1814  }
1815  return baud;
1816 }
1817 
1818 static int MoxaPortGetLineOut(struct moxa_port *port, int *dtrState,
1819  int *rtsState)
1820 {
1821  if (dtrState)
1822  *dtrState = !!(port->lineCtrl & DTR_ON);
1823  if (rtsState)
1824  *rtsState = !!(port->lineCtrl & RTS_ON);
1825 
1826  return 0;
1827 }
1828 
1829 static void MoxaPortLineCtrl(struct moxa_port *port, int dtr, int rts)
1830 {
1831  u8 mode = 0;
1832 
1833  if (dtr)
1834  mode |= DTR_ON;
1835  if (rts)
1836  mode |= RTS_ON;
1837  port->lineCtrl = mode;
1838  moxafunc(port->tableAddr, FC_LineControl, mode);
1839 }
1840 
1841 static void MoxaPortFlowCtrl(struct moxa_port *port, int rts, int cts,
1842  int txflow, int rxflow, int txany)
1843 {
1844  int mode = 0;
1845 
1846  if (rts)
1847  mode |= RTS_FlowCtl;
1848  if (cts)
1849  mode |= CTS_FlowCtl;
1850  if (txflow)
1851  mode |= Tx_FlowCtl;
1852  if (rxflow)
1853  mode |= Rx_FlowCtl;
1854  if (txany)
1855  mode |= IXM_IXANY;
1856  moxafunc(port->tableAddr, FC_SetFlowCtl, mode);
1857 }
1858 
1859 static int MoxaPortLineStatus(struct moxa_port *port)
1860 {
1861  void __iomem *ofsAddr;
1862  int val;
1863 
1864  ofsAddr = port->tableAddr;
1865  if (MOXA_IS_320(port->board))
1866  val = moxafuncret(ofsAddr, FC_LineStatus, 0);
1867  else
1868  val = readw(ofsAddr + FlagStat) >> 4;
1869  val &= 0x0B;
1870  if (val & 8)
1871  val |= 4;
1872  moxa_new_dcdstate(port, val & 8);
1873  val &= 7;
1874  return val;
1875 }
1876 
1877 static int MoxaPortWriteData(struct tty_struct *tty,
1878  const unsigned char *buffer, int len)
1879 {
1880  struct moxa_port *port = tty->driver_data;
1881  void __iomem *baseAddr, *ofsAddr, *ofs;
1882  unsigned int c, total;
1883  u16 head, tail, tx_mask, spage, epage;
1884  u16 pageno, pageofs, bufhead;
1885 
1886  ofsAddr = port->tableAddr;
1887  baseAddr = port->board->basemem;
1888  tx_mask = readw(ofsAddr + TX_mask);
1889  spage = readw(ofsAddr + Page_txb);
1890  epage = readw(ofsAddr + EndPage_txb);
1891  tail = readw(ofsAddr + TXwptr);
1892  head = readw(ofsAddr + TXrptr);
1893  c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
1894  if (c > len)
1895  c = len;
1896  moxaLog.txcnt[port->port.tty->index] += c;
1897  total = c;
1898  if (spage == epage) {
1899  bufhead = readw(ofsAddr + Ofs_txb);
1900  writew(spage, baseAddr + Control_reg);
1901  while (c > 0) {
1902  if (head > tail)
1903  len = head - tail - 1;
1904  else
1905  len = tx_mask + 1 - tail;
1906  len = (c > len) ? len : c;
1907  ofs = baseAddr + DynPage_addr + bufhead + tail;
1908  memcpy_toio(ofs, buffer, len);
1909  buffer += len;
1910  tail = (tail + len) & tx_mask;
1911  c -= len;
1912  }
1913  } else {
1914  pageno = spage + (tail >> 13);
1915  pageofs = tail & Page_mask;
1916  while (c > 0) {
1917  len = Page_size - pageofs;
1918  if (len > c)
1919  len = c;
1920  writeb(pageno, baseAddr + Control_reg);
1921  ofs = baseAddr + DynPage_addr + pageofs;
1922  memcpy_toio(ofs, buffer, len);
1923  buffer += len;
1924  if (++pageno == epage)
1925  pageno = spage;
1926  pageofs = 0;
1927  c -= len;
1928  }
1929  tail = (tail + total) & tx_mask;
1930  }
1931  writew(tail, ofsAddr + TXwptr);
1932  writeb(1, ofsAddr + CD180TXirq); /* start to send */
1933  return total;
1934 }
1935 
1936 static int MoxaPortReadData(struct moxa_port *port)
1937 {
1938  struct tty_struct *tty = port->port.tty;
1939  unsigned char *dst;
1940  void __iomem *baseAddr, *ofsAddr, *ofs;
1941  unsigned int count, len, total;
1942  u16 tail, rx_mask, spage, epage;
1943  u16 pageno, pageofs, bufhead, head;
1944 
1945  ofsAddr = port->tableAddr;
1946  baseAddr = port->board->basemem;
1947  head = readw(ofsAddr + RXrptr);
1948  tail = readw(ofsAddr + RXwptr);
1949  rx_mask = readw(ofsAddr + RX_mask);
1950  spage = readw(ofsAddr + Page_rxb);
1951  epage = readw(ofsAddr + EndPage_rxb);
1952  count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
1953  if (count == 0)
1954  return 0;
1955 
1956  total = count;
1957  moxaLog.rxcnt[tty->index] += total;
1958  if (spage == epage) {
1959  bufhead = readw(ofsAddr + Ofs_rxb);
1960  writew(spage, baseAddr + Control_reg);
1961  while (count > 0) {
1962  ofs = baseAddr + DynPage_addr + bufhead + head;
1963  len = (tail >= head) ? (tail - head) :
1964  (rx_mask + 1 - head);
1965  len = tty_prepare_flip_string(tty, &dst,
1966  min(len, count));
1967  memcpy_fromio(dst, ofs, len);
1968  head = (head + len) & rx_mask;
1969  count -= len;
1970  }
1971  } else {
1972  pageno = spage + (head >> 13);
1973  pageofs = head & Page_mask;
1974  while (count > 0) {
1975  writew(pageno, baseAddr + Control_reg);
1976  ofs = baseAddr + DynPage_addr + pageofs;
1977  len = tty_prepare_flip_string(tty, &dst,
1978  min(Page_size - pageofs, count));
1979  memcpy_fromio(dst, ofs, len);
1980 
1981  count -= len;
1982  pageofs = (pageofs + len) & Page_mask;
1983  if (pageofs == 0 && ++pageno == epage)
1984  pageno = spage;
1985  }
1986  head = (head + total) & rx_mask;
1987  }
1988  writew(head, ofsAddr + RXrptr);
1989  if (readb(ofsAddr + FlagStat) & Xoff_state) {
1990  moxaLowWaterChk = 1;
1991  port->lowChkFlag = 1;
1992  }
1993  return total;
1994 }
1995 
1996 
1997 static int MoxaPortTxQueue(struct moxa_port *port)
1998 {
1999  void __iomem *ofsAddr = port->tableAddr;
2000  u16 rptr, wptr, mask;
2001 
2002  rptr = readw(ofsAddr + TXrptr);
2003  wptr = readw(ofsAddr + TXwptr);
2004  mask = readw(ofsAddr + TX_mask);
2005  return (wptr - rptr) & mask;
2006 }
2007 
2008 static int MoxaPortTxFree(struct moxa_port *port)
2009 {
2010  void __iomem *ofsAddr = port->tableAddr;
2011  u16 rptr, wptr, mask;
2012 
2013  rptr = readw(ofsAddr + TXrptr);
2014  wptr = readw(ofsAddr + TXwptr);
2015  mask = readw(ofsAddr + TX_mask);
2016  return mask - ((wptr - rptr) & mask);
2017 }
2018 
2019 static int MoxaPortRxQueue(struct moxa_port *port)
2020 {
2021  void __iomem *ofsAddr = port->tableAddr;
2022  u16 rptr, wptr, mask;
2023 
2024  rptr = readw(ofsAddr + RXrptr);
2025  wptr = readw(ofsAddr + RXwptr);
2026  mask = readw(ofsAddr + RX_mask);
2027  return (wptr - rptr) & mask;
2028 }
2029 
2030 static void MoxaPortTxDisable(struct moxa_port *port)
2031 {
2032  moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
2033 }
2034 
2035 static void MoxaPortTxEnable(struct moxa_port *port)
2036 {
2037  moxafunc(port->tableAddr, FC_SetXonState, Magic_code);
2038 }
2039 
2040 static int moxa_get_serial_info(struct moxa_port *info,
2041  struct serial_struct __user *retinfo)
2042 {
2043  struct serial_struct tmp = {
2044  .type = info->type,
2045  .line = info->port.tty->index,
2046  .flags = info->port.flags,
2047  .baud_base = 921600,
2048  .close_delay = info->port.close_delay
2049  };
2050  return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
2051 }
2052 
2053 
2054 static int moxa_set_serial_info(struct moxa_port *info,
2055  struct serial_struct __user *new_info)
2056 {
2057  struct serial_struct new_serial;
2058 
2059  if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
2060  return -EFAULT;
2061 
2062  if (new_serial.irq != 0 || new_serial.port != 0 ||
2063  new_serial.custom_divisor != 0 ||
2064  new_serial.baud_base != 921600)
2065  return -EPERM;
2066 
2067  if (!capable(CAP_SYS_ADMIN)) {
2068  if (((new_serial.flags & ~ASYNC_USR_MASK) !=
2069  (info->port.flags & ~ASYNC_USR_MASK)))
2070  return -EPERM;
2071  } else
2072  info->port.close_delay = new_serial.close_delay * HZ / 100;
2073 
2074  new_serial.flags = (new_serial.flags & ~ASYNC_FLAGS);
2075  new_serial.flags |= (info->port.flags & ASYNC_FLAGS);
2076 
2077  MoxaSetFifo(info, new_serial.type == PORT_16550A);
2078 
2079  info->type = new_serial.type;
2080  return 0;
2081 }
2082 
2083 
2084 
2085 /*****************************************************************************
2086  * Static local functions: *
2087  *****************************************************************************/
2088 
2089 static void MoxaSetFifo(struct moxa_port *port, int enable)
2090 {
2091  void __iomem *ofsAddr = port->tableAddr;
2092 
2093  if (!enable) {
2094  moxafunc(ofsAddr, FC_SetRxFIFOTrig, 0);
2095  moxafunc(ofsAddr, FC_SetTxFIFOCnt, 1);
2096  } else {
2097  moxafunc(ofsAddr, FC_SetRxFIFOTrig, 3);
2098  moxafunc(ofsAddr, FC_SetTxFIFOCnt, 16);
2099  }
2100 }
Generated on Thu Jan 10 2013 14:33:47 for Linux Kernel by   doxygen 1.8.2