Version:  2.0.40 2.2.26 2.4.37 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8

Linux/drivers/tty/mxser.c

  1 /*
  2  *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
  3  *
  4  *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com).
  5  *      Copyright (C) 2006-2008  Jiri Slaby <jirislaby@gmail.com>
  6  *
  7  *      This code is loosely based on the 1.8 moxa driver which is based on
  8  *      Linux serial driver, written by Linus Torvalds, Theodore T'so and
  9  *      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  *      Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
 17  *      <alan@lxorguk.ukuu.org.uk>. The original 1.8 code is available on
 18  *      www.moxa.com.
 19  *      - Fixed x86_64 cleanness
 20  */
 21 
 22 #include <linux/module.h>
 23 #include <linux/errno.h>
 24 #include <linux/signal.h>
 25 #include <linux/sched.h>
 26 #include <linux/timer.h>
 27 #include <linux/interrupt.h>
 28 #include <linux/tty.h>
 29 #include <linux/tty_flip.h>
 30 #include <linux/serial.h>
 31 #include <linux/serial_reg.h>
 32 #include <linux/major.h>
 33 #include <linux/string.h>
 34 #include <linux/fcntl.h>
 35 #include <linux/ptrace.h>
 36 #include <linux/ioport.h>
 37 #include <linux/mm.h>
 38 #include <linux/delay.h>
 39 #include <linux/pci.h>
 40 #include <linux/bitops.h>
 41 #include <linux/slab.h>
 42 #include <linux/ratelimit.h>
 43 
 44 #include <asm/io.h>
 45 #include <asm/irq.h>
 46 #include <asm/uaccess.h>
 47 
 48 #include "mxser.h"
 49 
 50 #define MXSER_VERSION   "2.0.5"         /* 1.14 */
 51 #define MXSERMAJOR       174
 52 
 53 #define MXSER_BOARDS            4       /* Max. boards */
 54 #define MXSER_PORTS_PER_BOARD   8       /* Max. ports per board */
 55 #define MXSER_PORTS             (MXSER_BOARDS * MXSER_PORTS_PER_BOARD)
 56 #define MXSER_ISR_PASS_LIMIT    100
 57 
 58 /*CheckIsMoxaMust return value*/
 59 #define MOXA_OTHER_UART         0x00
 60 #define MOXA_MUST_MU150_HWID    0x01
 61 #define MOXA_MUST_MU860_HWID    0x02
 62 
 63 #define WAKEUP_CHARS            256
 64 
 65 #define UART_MCR_AFE            0x20
 66 #define UART_LSR_SPECIAL        0x1E
 67 
 68 #define PCI_DEVICE_ID_POS104UL  0x1044
 69 #define PCI_DEVICE_ID_CB108     0x1080
 70 #define PCI_DEVICE_ID_CP102UF   0x1023
 71 #define PCI_DEVICE_ID_CP112UL   0x1120
 72 #define PCI_DEVICE_ID_CB114     0x1142
 73 #define PCI_DEVICE_ID_CP114UL   0x1143
 74 #define PCI_DEVICE_ID_CB134I    0x1341
 75 #define PCI_DEVICE_ID_CP138U    0x1380
 76 
 77 
 78 #define C168_ASIC_ID    1
 79 #define C104_ASIC_ID    2
 80 #define C102_ASIC_ID    0xB
 81 #define CI132_ASIC_ID   4
 82 #define CI134_ASIC_ID   3
 83 #define CI104J_ASIC_ID  5
 84 
 85 #define MXSER_HIGHBAUD  1
 86 #define MXSER_HAS2      2
 87 
 88 /* This is only for PCI */
 89 static const struct {
 90         int type;
 91         int tx_fifo;
 92         int rx_fifo;
 93         int xmit_fifo_size;
 94         int rx_high_water;
 95         int rx_trigger;
 96         int rx_low_water;
 97         long max_baud;
 98 } Gpci_uart_info[] = {
 99         {MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
100         {MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
101         {MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
102 };
103 #define UART_INFO_NUM   ARRAY_SIZE(Gpci_uart_info)
104 
105 struct mxser_cardinfo {
106         char *name;
107         unsigned int nports;
108         unsigned int flags;
109 };
110 
111 static const struct mxser_cardinfo mxser_cards[] = {
112 /* 0*/  { "C168 series",        8, },
113         { "C104 series",        4, },
114         { "CI-104J series",     4, },
115         { "C168H/PCI series",   8, },
116         { "C104H/PCI series",   4, },
117 /* 5*/  { "C102 series",        4, MXSER_HAS2 },        /* C102-ISA */
118         { "CI-132 series",      4, MXSER_HAS2 },
119         { "CI-134 series",      4, },
120         { "CP-132 series",      2, },
121         { "CP-114 series",      4, },
122 /*10*/  { "CT-114 series",      4, },
123         { "CP-102 series",      2, MXSER_HIGHBAUD },
124         { "CP-104U series",     4, },
125         { "CP-168U series",     8, },
126         { "CP-132U series",     2, },
127 /*15*/  { "CP-134U series",     4, },
128         { "CP-104JU series",    4, },
129         { "Moxa UC7000 Serial", 8, },           /* RC7000 */
130         { "CP-118U series",     8, },
131         { "CP-102UL series",    2, },
132 /*20*/  { "CP-102U series",     2, },
133         { "CP-118EL series",    8, },
134         { "CP-168EL series",    8, },
135         { "CP-104EL series",    4, },
136         { "CB-108 series",      8, },
137 /*25*/  { "CB-114 series",      4, },
138         { "CB-134I series",     4, },
139         { "CP-138U series",     8, },
140         { "POS-104UL series",   4, },
141         { "CP-114UL series",    4, },
142 /*30*/  { "CP-102UF series",    2, },
143         { "CP-112UL series",    2, },
144 };
145 
146 /* driver_data correspond to the lines in the structure above
147    see also ISA probe function before you change something */
148 static struct pci_device_id mxser_pcibrds[] = {
149         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C168),   .driver_data = 3 },
150         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_C104),   .driver_data = 4 },
151         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132),  .driver_data = 8 },
152         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP114),  .driver_data = 9 },
153         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CT114),  .driver_data = 10 },
154         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102),  .driver_data = 11 },
155         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104U), .driver_data = 12 },
156         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168U), .driver_data = 13 },
157         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP132U), .driver_data = 14 },
158         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP134U), .driver_data = 15 },
159         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104JU),.driver_data = 16 },
160         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_RC7000), .driver_data = 17 },
161         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118U), .driver_data = 18 },
162         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102UL),.driver_data = 19 },
163         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP102U), .driver_data = 20 },
164         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP118EL),.driver_data = 21 },
165         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP168EL),.driver_data = 22 },
166         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_MOXA_CP104EL),.driver_data = 23 },
167         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB108),       .driver_data = 24 },
168         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB114),       .driver_data = 25 },
169         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CB134I),      .driver_data = 26 },
170         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP138U),      .driver_data = 27 },
171         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_POS104UL),    .driver_data = 28 },
172         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP114UL),     .driver_data = 29 },
173         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP102UF),     .driver_data = 30 },
174         { PCI_VDEVICE(MOXA, PCI_DEVICE_ID_CP112UL),     .driver_data = 31 },
175         { }
176 };
177 MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
178 
179 static unsigned long ioaddr[MXSER_BOARDS];
180 static int ttymajor = MXSERMAJOR;
181 
182 /* Variables for insmod */
183 
184 MODULE_AUTHOR("Casper Yang");
185 MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
186 module_param_array(ioaddr, ulong, NULL, 0);
187 MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
188 module_param(ttymajor, int, 0);
189 MODULE_LICENSE("GPL");
190 
191 struct mxser_log {
192         int tick;
193         unsigned long rxcnt[MXSER_PORTS];
194         unsigned long txcnt[MXSER_PORTS];
195 };
196 
197 struct mxser_mon {
198         unsigned long rxcnt;
199         unsigned long txcnt;
200         unsigned long up_rxcnt;
201         unsigned long up_txcnt;
202         int modem_status;
203         unsigned char hold_reason;
204 };
205 
206 struct mxser_mon_ext {
207         unsigned long rx_cnt[32];
208         unsigned long tx_cnt[32];
209         unsigned long up_rxcnt[32];
210         unsigned long up_txcnt[32];
211         int modem_status[32];
212 
213         long baudrate[32];
214         int databits[32];
215         int stopbits[32];
216         int parity[32];
217         int flowctrl[32];
218         int fifo[32];
219         int iftype[32];
220 };
221 
222 struct mxser_board;
223 
224 struct mxser_port {
225         struct tty_port port;
226         struct mxser_board *board;
227 
228         unsigned long ioaddr;
229         unsigned long opmode_ioaddr;
230         int max_baud;
231 
232         int rx_high_water;
233         int rx_trigger;         /* Rx fifo trigger level */
234         int rx_low_water;
235         int baud_base;          /* max. speed */
236         int type;               /* UART type */
237 
238         int x_char;             /* xon/xoff character */
239         int IER;                /* Interrupt Enable Register */
240         int MCR;                /* Modem control register */
241 
242         unsigned char stop_rx;
243         unsigned char ldisc_stop_rx;
244 
245         int custom_divisor;
246         unsigned char err_shadow;
247 
248         struct async_icount icount; /* kernel counters for 4 input interrupts */
249         int timeout;
250 
251         int read_status_mask;
252         int ignore_status_mask;
253         int xmit_fifo_size;
254         int xmit_head;
255         int xmit_tail;
256         int xmit_cnt;
257         int closing;
258 
259         struct ktermios normal_termios;
260 
261         struct mxser_mon mon_data;
262 
263         spinlock_t slock;
264 };
265 
266 struct mxser_board {
267         unsigned int idx;
268         int irq;
269         const struct mxser_cardinfo *info;
270         unsigned long vector;
271         unsigned long vector_mask;
272 
273         int chip_flag;
274         int uart_type;
275 
276         struct mxser_port ports[MXSER_PORTS_PER_BOARD];
277 };
278 
279 struct mxser_mstatus {
280         tcflag_t cflag;
281         int cts;
282         int dsr;
283         int ri;
284         int dcd;
285 };
286 
287 static struct mxser_board mxser_boards[MXSER_BOARDS];
288 static struct tty_driver *mxvar_sdriver;
289 static struct mxser_log mxvar_log;
290 static int mxser_set_baud_method[MXSER_PORTS + 1];
291 
292 static void mxser_enable_must_enchance_mode(unsigned long baseio)
293 {
294         u8 oldlcr;
295         u8 efr;
296 
297         oldlcr = inb(baseio + UART_LCR);
298         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
299 
300         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
301         efr |= MOXA_MUST_EFR_EFRB_ENABLE;
302 
303         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
304         outb(oldlcr, baseio + UART_LCR);
305 }
306 
307 #ifdef  CONFIG_PCI
308 static void mxser_disable_must_enchance_mode(unsigned long baseio)
309 {
310         u8 oldlcr;
311         u8 efr;
312 
313         oldlcr = inb(baseio + UART_LCR);
314         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
315 
316         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
317         efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
318 
319         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
320         outb(oldlcr, baseio + UART_LCR);
321 }
322 #endif
323 
324 static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
325 {
326         u8 oldlcr;
327         u8 efr;
328 
329         oldlcr = inb(baseio + UART_LCR);
330         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
331 
332         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
333         efr &= ~MOXA_MUST_EFR_BANK_MASK;
334         efr |= MOXA_MUST_EFR_BANK0;
335 
336         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
337         outb(value, baseio + MOXA_MUST_XON1_REGISTER);
338         outb(oldlcr, baseio + UART_LCR);
339 }
340 
341 static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
342 {
343         u8 oldlcr;
344         u8 efr;
345 
346         oldlcr = inb(baseio + UART_LCR);
347         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
348 
349         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
350         efr &= ~MOXA_MUST_EFR_BANK_MASK;
351         efr |= MOXA_MUST_EFR_BANK0;
352 
353         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
354         outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
355         outb(oldlcr, baseio + UART_LCR);
356 }
357 
358 static void mxser_set_must_fifo_value(struct mxser_port *info)
359 {
360         u8 oldlcr;
361         u8 efr;
362 
363         oldlcr = inb(info->ioaddr + UART_LCR);
364         outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
365 
366         efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
367         efr &= ~MOXA_MUST_EFR_BANK_MASK;
368         efr |= MOXA_MUST_EFR_BANK1;
369 
370         outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
371         outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
372         outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
373         outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
374         outb(oldlcr, info->ioaddr + UART_LCR);
375 }
376 
377 static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
378 {
379         u8 oldlcr;
380         u8 efr;
381 
382         oldlcr = inb(baseio + UART_LCR);
383         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
384 
385         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
386         efr &= ~MOXA_MUST_EFR_BANK_MASK;
387         efr |= MOXA_MUST_EFR_BANK2;
388 
389         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
390         outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
391         outb(oldlcr, baseio + UART_LCR);
392 }
393 
394 #ifdef CONFIG_PCI
395 static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
396 {
397         u8 oldlcr;
398         u8 efr;
399 
400         oldlcr = inb(baseio + UART_LCR);
401         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
402 
403         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
404         efr &= ~MOXA_MUST_EFR_BANK_MASK;
405         efr |= MOXA_MUST_EFR_BANK2;
406 
407         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
408         *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
409         outb(oldlcr, baseio + UART_LCR);
410 }
411 #endif
412 
413 static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
414 {
415         u8 oldlcr;
416         u8 efr;
417 
418         oldlcr = inb(baseio + UART_LCR);
419         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
420 
421         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
422         efr &= ~MOXA_MUST_EFR_SF_MASK;
423 
424         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
425         outb(oldlcr, baseio + UART_LCR);
426 }
427 
428 static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
429 {
430         u8 oldlcr;
431         u8 efr;
432 
433         oldlcr = inb(baseio + UART_LCR);
434         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
435 
436         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
437         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
438         efr |= MOXA_MUST_EFR_SF_TX1;
439 
440         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
441         outb(oldlcr, baseio + UART_LCR);
442 }
443 
444 static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
445 {
446         u8 oldlcr;
447         u8 efr;
448 
449         oldlcr = inb(baseio + UART_LCR);
450         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
451 
452         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
453         efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
454 
455         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
456         outb(oldlcr, baseio + UART_LCR);
457 }
458 
459 static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
460 {
461         u8 oldlcr;
462         u8 efr;
463 
464         oldlcr = inb(baseio + UART_LCR);
465         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
466 
467         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
468         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
469         efr |= MOXA_MUST_EFR_SF_RX1;
470 
471         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
472         outb(oldlcr, baseio + UART_LCR);
473 }
474 
475 static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
476 {
477         u8 oldlcr;
478         u8 efr;
479 
480         oldlcr = inb(baseio + UART_LCR);
481         outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
482 
483         efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
484         efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
485 
486         outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
487         outb(oldlcr, baseio + UART_LCR);
488 }
489 
490 #ifdef CONFIG_PCI
491 static int CheckIsMoxaMust(unsigned long io)
492 {
493         u8 oldmcr, hwid;
494         int i;
495 
496         outb(0, io + UART_LCR);
497         mxser_disable_must_enchance_mode(io);
498         oldmcr = inb(io + UART_MCR);
499         outb(0, io + UART_MCR);
500         mxser_set_must_xon1_value(io, 0x11);
501         if ((hwid = inb(io + UART_MCR)) != 0) {
502                 outb(oldmcr, io + UART_MCR);
503                 return MOXA_OTHER_UART;
504         }
505 
506         mxser_get_must_hardware_id(io, &hwid);
507         for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
508                 if (hwid == Gpci_uart_info[i].type)
509                         return (int)hwid;
510         }
511         return MOXA_OTHER_UART;
512 }
513 #endif
514 
515 static void process_txrx_fifo(struct mxser_port *info)
516 {
517         int i;
518 
519         if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
520                 info->rx_trigger = 1;
521                 info->rx_high_water = 1;
522                 info->rx_low_water = 1;
523                 info->xmit_fifo_size = 1;
524         } else
525                 for (i = 0; i < UART_INFO_NUM; i++)
526                         if (info->board->chip_flag == Gpci_uart_info[i].type) {
527                                 info->rx_trigger = Gpci_uart_info[i].rx_trigger;
528                                 info->rx_low_water = Gpci_uart_info[i].rx_low_water;
529                                 info->rx_high_water = Gpci_uart_info[i].rx_high_water;
530                                 info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
531                                 break;
532                         }
533 }
534 
535 static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
536 {
537         static unsigned char mxser_msr[MXSER_PORTS + 1];
538         unsigned char status = 0;
539 
540         status = inb(baseaddr + UART_MSR);
541 
542         mxser_msr[port] &= 0x0F;
543         mxser_msr[port] |= status;
544         status = mxser_msr[port];
545         if (mode)
546                 mxser_msr[port] = 0;
547 
548         return status;
549 }
550 
551 static int mxser_carrier_raised(struct tty_port *port)
552 {
553         struct mxser_port *mp = container_of(port, struct mxser_port, port);
554         return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
555 }
556 
557 static void mxser_dtr_rts(struct tty_port *port, int on)
558 {
559         struct mxser_port *mp = container_of(port, struct mxser_port, port);
560         unsigned long flags;
561 
562         spin_lock_irqsave(&mp->slock, flags);
563         if (on)
564                 outb(inb(mp->ioaddr + UART_MCR) |
565                         UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
566         else
567                 outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
568                         mp->ioaddr + UART_MCR);
569         spin_unlock_irqrestore(&mp->slock, flags);
570 }
571 
572 static int mxser_set_baud(struct tty_struct *tty, long newspd)
573 {
574         struct mxser_port *info = tty->driver_data;
575         int quot = 0, baud;
576         unsigned char cval;
577 
578         if (!info->ioaddr)
579                 return -1;
580 
581         if (newspd > info->max_baud)
582                 return -1;
583 
584         if (newspd == 134) {
585                 quot = 2 * info->baud_base / 269;
586                 tty_encode_baud_rate(tty, 134, 134);
587         } else if (newspd) {
588                 quot = info->baud_base / newspd;
589                 if (quot == 0)
590                         quot = 1;
591                 baud = info->baud_base/quot;
592                 tty_encode_baud_rate(tty, baud, baud);
593         } else {
594                 quot = 0;
595         }
596 
597         info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
598         info->timeout += HZ / 50;       /* Add .02 seconds of slop */
599 
600         if (quot) {
601                 info->MCR |= UART_MCR_DTR;
602                 outb(info->MCR, info->ioaddr + UART_MCR);
603         } else {
604                 info->MCR &= ~UART_MCR_DTR;
605                 outb(info->MCR, info->ioaddr + UART_MCR);
606                 return 0;
607         }
608 
609         cval = inb(info->ioaddr + UART_LCR);
610 
611         outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);    /* set DLAB */
612 
613         outb(quot & 0xff, info->ioaddr + UART_DLL);     /* LS of divisor */
614         outb(quot >> 8, info->ioaddr + UART_DLM);       /* MS of divisor */
615         outb(cval, info->ioaddr + UART_LCR);    /* reset DLAB */
616 
617 #ifdef BOTHER
618         if (C_BAUD(tty) == BOTHER) {
619                 quot = info->baud_base % newspd;
620                 quot *= 8;
621                 if (quot % newspd > newspd / 2) {
622                         quot /= newspd;
623                         quot++;
624                 } else
625                         quot /= newspd;
626 
627                 mxser_set_must_enum_value(info->ioaddr, quot);
628         } else
629 #endif
630                 mxser_set_must_enum_value(info->ioaddr, 0);
631 
632         return 0;
633 }
634 
635 /*
636  * This routine is called to set the UART divisor registers to match
637  * the specified baud rate for a serial port.
638  */
639 static int mxser_change_speed(struct tty_struct *tty,
640                                         struct ktermios *old_termios)
641 {
642         struct mxser_port *info = tty->driver_data;
643         unsigned cflag, cval, fcr;
644         int ret = 0;
645         unsigned char status;
646 
647         cflag = tty->termios.c_cflag;
648         if (!info->ioaddr)
649                 return ret;
650 
651         if (mxser_set_baud_method[tty->index] == 0)
652                 mxser_set_baud(tty, tty_get_baud_rate(tty));
653 
654         /* byte size and parity */
655         switch (cflag & CSIZE) {
656         case CS5:
657                 cval = 0x00;
658                 break;
659         case CS6:
660                 cval = 0x01;
661                 break;
662         case CS7:
663                 cval = 0x02;
664                 break;
665         case CS8:
666                 cval = 0x03;
667                 break;
668         default:
669                 cval = 0x00;
670                 break;          /* too keep GCC shut... */
671         }
672         if (cflag & CSTOPB)
673                 cval |= 0x04;
674         if (cflag & PARENB)
675                 cval |= UART_LCR_PARITY;
676         if (!(cflag & PARODD))
677                 cval |= UART_LCR_EPAR;
678         if (cflag & CMSPAR)
679                 cval |= UART_LCR_SPAR;
680 
681         if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
682                 if (info->board->chip_flag) {
683                         fcr = UART_FCR_ENABLE_FIFO;
684                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
685                         mxser_set_must_fifo_value(info);
686                 } else
687                         fcr = 0;
688         } else {
689                 fcr = UART_FCR_ENABLE_FIFO;
690                 if (info->board->chip_flag) {
691                         fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
692                         mxser_set_must_fifo_value(info);
693                 } else {
694                         switch (info->rx_trigger) {
695                         case 1:
696                                 fcr |= UART_FCR_TRIGGER_1;
697                                 break;
698                         case 4:
699                                 fcr |= UART_FCR_TRIGGER_4;
700                                 break;
701                         case 8:
702                                 fcr |= UART_FCR_TRIGGER_8;
703                                 break;
704                         default:
705                                 fcr |= UART_FCR_TRIGGER_14;
706                                 break;
707                         }
708                 }
709         }
710 
711         /* CTS flow control flag and modem status interrupts */
712         info->IER &= ~UART_IER_MSI;
713         info->MCR &= ~UART_MCR_AFE;
714         tty_port_set_cts_flow(&info->port, cflag & CRTSCTS);
715         if (cflag & CRTSCTS) {
716                 info->IER |= UART_IER_MSI;
717                 if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
718                         info->MCR |= UART_MCR_AFE;
719                 } else {
720                         status = inb(info->ioaddr + UART_MSR);
721                         if (tty->hw_stopped) {
722                                 if (status & UART_MSR_CTS) {
723                                         tty->hw_stopped = 0;
724                                         if (info->type != PORT_16550A &&
725                                                         !info->board->chip_flag) {
726                                                 outb(info->IER & ~UART_IER_THRI,
727                                                         info->ioaddr +
728                                                         UART_IER);
729                                                 info->IER |= UART_IER_THRI;
730                                                 outb(info->IER, info->ioaddr +
731                                                                 UART_IER);
732                                         }
733                                         tty_wakeup(tty);
734                                 }
735                         } else {
736                                 if (!(status & UART_MSR_CTS)) {
737                                         tty->hw_stopped = 1;
738                                         if ((info->type != PORT_16550A) &&
739                                                         (!info->board->chip_flag)) {
740                                                 info->IER &= ~UART_IER_THRI;
741                                                 outb(info->IER, info->ioaddr +
742                                                                 UART_IER);
743                                         }
744                                 }
745                         }
746                 }
747         }
748         outb(info->MCR, info->ioaddr + UART_MCR);
749         tty_port_set_check_carrier(&info->port, ~cflag & CLOCAL);
750         if (~cflag & CLOCAL)
751                 info->IER |= UART_IER_MSI;
752         outb(info->IER, info->ioaddr + UART_IER);
753 
754         /*
755          * Set up parity check flag
756          */
757         info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
758         if (I_INPCK(tty))
759                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
760         if (I_BRKINT(tty) || I_PARMRK(tty))
761                 info->read_status_mask |= UART_LSR_BI;
762 
763         info->ignore_status_mask = 0;
764 
765         if (I_IGNBRK(tty)) {
766                 info->ignore_status_mask |= UART_LSR_BI;
767                 info->read_status_mask |= UART_LSR_BI;
768                 /*
769                  * If we're ignore parity and break indicators, ignore
770                  * overruns too.  (For real raw support).
771                  */
772                 if (I_IGNPAR(tty)) {
773                         info->ignore_status_mask |=
774                                                 UART_LSR_OE |
775                                                 UART_LSR_PE |
776                                                 UART_LSR_FE;
777                         info->read_status_mask |=
778                                                 UART_LSR_OE |
779                                                 UART_LSR_PE |
780                                                 UART_LSR_FE;
781                 }
782         }
783         if (info->board->chip_flag) {
784                 mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
785                 mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
786                 if (I_IXON(tty)) {
787                         mxser_enable_must_rx_software_flow_control(
788                                         info->ioaddr);
789                 } else {
790                         mxser_disable_must_rx_software_flow_control(
791                                         info->ioaddr);
792                 }
793                 if (I_IXOFF(tty)) {
794                         mxser_enable_must_tx_software_flow_control(
795                                         info->ioaddr);
796                 } else {
797                         mxser_disable_must_tx_software_flow_control(
798                                         info->ioaddr);
799                 }
800         }
801 
802 
803         outb(fcr, info->ioaddr + UART_FCR);     /* set fcr */
804         outb(cval, info->ioaddr + UART_LCR);
805 
806         return ret;
807 }
808 
809 static void mxser_check_modem_status(struct tty_struct *tty,
810                                 struct mxser_port *port, int status)
811 {
812         /* update input line counters */
813         if (status & UART_MSR_TERI)
814                 port->icount.rng++;
815         if (status & UART_MSR_DDSR)
816                 port->icount.dsr++;
817         if (status & UART_MSR_DDCD)
818                 port->icount.dcd++;
819         if (status & UART_MSR_DCTS)
820                 port->icount.cts++;
821         port->mon_data.modem_status = status;
822         wake_up_interruptible(&port->port.delta_msr_wait);
823 
824         if (tty_port_check_carrier(&port->port) && (status & UART_MSR_DDCD)) {
825                 if (status & UART_MSR_DCD)
826                         wake_up_interruptible(&port->port.open_wait);
827         }
828 
829         if (tty_port_cts_enabled(&port->port)) {
830                 if (tty->hw_stopped) {
831                         if (status & UART_MSR_CTS) {
832                                 tty->hw_stopped = 0;
833 
834                                 if ((port->type != PORT_16550A) &&
835                                                 (!port->board->chip_flag)) {
836                                         outb(port->IER & ~UART_IER_THRI,
837                                                 port->ioaddr + UART_IER);
838                                         port->IER |= UART_IER_THRI;
839                                         outb(port->IER, port->ioaddr +
840                                                         UART_IER);
841                                 }
842                                 tty_wakeup(tty);
843                         }
844                 } else {
845                         if (!(status & UART_MSR_CTS)) {
846                                 tty->hw_stopped = 1;
847                                 if (port->type != PORT_16550A &&
848                                                 !port->board->chip_flag) {
849                                         port->IER &= ~UART_IER_THRI;
850                                         outb(port->IER, port->ioaddr +
851                                                         UART_IER);
852                                 }
853                         }
854                 }
855         }
856 }
857 
858 static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
859 {
860         struct mxser_port *info = container_of(port, struct mxser_port, port);
861         unsigned long page;
862         unsigned long flags;
863 
864         page = __get_free_page(GFP_KERNEL);
865         if (!page)
866                 return -ENOMEM;
867 
868         spin_lock_irqsave(&info->slock, flags);
869 
870         if (!info->ioaddr || !info->type) {
871                 set_bit(TTY_IO_ERROR, &tty->flags);
872                 free_page(page);
873                 spin_unlock_irqrestore(&info->slock, flags);
874                 return 0;
875         }
876         info->port.xmit_buf = (unsigned char *) page;
877 
878         /*
879          * Clear the FIFO buffers and disable them
880          * (they will be reenabled in mxser_change_speed())
881          */
882         if (info->board->chip_flag)
883                 outb((UART_FCR_CLEAR_RCVR |
884                         UART_FCR_CLEAR_XMIT |
885                         MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
886         else
887                 outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
888                         info->ioaddr + UART_FCR);
889 
890         /*
891          * At this point there's no way the LSR could still be 0xFF;
892          * if it is, then bail out, because there's likely no UART
893          * here.
894          */
895         if (inb(info->ioaddr + UART_LSR) == 0xff) {
896                 spin_unlock_irqrestore(&info->slock, flags);
897                 if (capable(CAP_SYS_ADMIN)) {
898                         set_bit(TTY_IO_ERROR, &tty->flags);
899                         return 0;
900                 } else
901                         return -ENODEV;
902         }
903 
904         /*
905          * Clear the interrupt registers.
906          */
907         (void) inb(info->ioaddr + UART_LSR);
908         (void) inb(info->ioaddr + UART_RX);
909         (void) inb(info->ioaddr + UART_IIR);
910         (void) inb(info->ioaddr + UART_MSR);
911 
912         /*
913          * Now, initialize the UART
914          */
915         outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);  /* reset DLAB */
916         info->MCR = UART_MCR_DTR | UART_MCR_RTS;
917         outb(info->MCR, info->ioaddr + UART_MCR);
918 
919         /*
920          * Finally, enable interrupts
921          */
922         info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
923 
924         if (info->board->chip_flag)
925                 info->IER |= MOXA_MUST_IER_EGDAI;
926         outb(info->IER, info->ioaddr + UART_IER);       /* enable interrupts */
927 
928         /*
929          * And clear the interrupt registers again for luck.
930          */
931         (void) inb(info->ioaddr + UART_LSR);
932         (void) inb(info->ioaddr + UART_RX);
933         (void) inb(info->ioaddr + UART_IIR);
934         (void) inb(info->ioaddr + UART_MSR);
935 
936         clear_bit(TTY_IO_ERROR, &tty->flags);
937         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
938 
939         /*
940          * and set the speed of the serial port
941          */
942         mxser_change_speed(tty, NULL);
943         spin_unlock_irqrestore(&info->slock, flags);
944 
945         return 0;
946 }
947 
948 /*
949  * This routine will shutdown a serial port
950  */
951 static void mxser_shutdown_port(struct tty_port *port)
952 {
953         struct mxser_port *info = container_of(port, struct mxser_port, port);
954         unsigned long flags;
955 
956         spin_lock_irqsave(&info->slock, flags);
957 
958         /*
959          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
960          * here so the queue might never be waken up
961          */
962         wake_up_interruptible(&info->port.delta_msr_wait);
963 
964         /*
965          * Free the xmit buffer, if necessary
966          */
967         if (info->port.xmit_buf) {
968                 free_page((unsigned long) info->port.xmit_buf);
969                 info->port.xmit_buf = NULL;
970         }
971 
972         info->IER = 0;
973         outb(0x00, info->ioaddr + UART_IER);
974 
975         /* clear Rx/Tx FIFO's */
976         if (info->board->chip_flag)
977                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
978                                 MOXA_MUST_FCR_GDA_MODE_ENABLE,
979                                 info->ioaddr + UART_FCR);
980         else
981                 outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
982                         info->ioaddr + UART_FCR);
983 
984         /* read data port to reset things */
985         (void) inb(info->ioaddr + UART_RX);
986 
987 
988         if (info->board->chip_flag)
989                 SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
990 
991         spin_unlock_irqrestore(&info->slock, flags);
992 }
993 
994 /*
995  * This routine is called whenever a serial port is opened.  It
996  * enables interrupts for a serial port, linking in its async structure into
997  * the IRQ chain.   It also performs the serial-specific
998  * initialization for the tty structure.
999  */
1000 static int mxser_open(struct tty_struct *tty, struct file *filp)
1001 {
1002         struct mxser_port *info;
1003         int line;
1004 
1005         line = tty->index;
1006         if (line == MXSER_PORTS)
1007                 return 0;
1008         info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1009         if (!info->ioaddr)
1010                 return -ENODEV;
1011 
1012         tty->driver_data = info;
1013         return tty_port_open(&info->port, tty, filp);
1014 }
1015 
1016 static void mxser_flush_buffer(struct tty_struct *tty)
1017 {
1018         struct mxser_port *info = tty->driver_data;
1019         char fcr;
1020         unsigned long flags;
1021 
1022 
1023         spin_lock_irqsave(&info->slock, flags);
1024         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1025 
1026         fcr = inb(info->ioaddr + UART_FCR);
1027         outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1028                 info->ioaddr + UART_FCR);
1029         outb(fcr, info->ioaddr + UART_FCR);
1030 
1031         spin_unlock_irqrestore(&info->slock, flags);
1032 
1033         tty_wakeup(tty);
1034 }
1035 
1036 
1037 static void mxser_close_port(struct tty_port *port)
1038 {
1039         struct mxser_port *info = container_of(port, struct mxser_port, port);
1040         unsigned long timeout;
1041         /*
1042          * At this point we stop accepting input.  To do this, we
1043          * disable the receive line status interrupts, and tell the
1044          * interrupt driver to stop checking the data ready bit in the
1045          * line status register.
1046          */
1047         info->IER &= ~UART_IER_RLSI;
1048         if (info->board->chip_flag)
1049                 info->IER &= ~MOXA_MUST_RECV_ISR;
1050 
1051         outb(info->IER, info->ioaddr + UART_IER);
1052         /*
1053          * Before we drop DTR, make sure the UART transmitter
1054          * has completely drained; this is especially
1055          * important if there is a transmit FIFO!
1056          */
1057         timeout = jiffies + HZ;
1058         while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1059                 schedule_timeout_interruptible(5);
1060                 if (time_after(jiffies, timeout))
1061                         break;
1062         }
1063 }
1064 
1065 /*
1066  * This routine is called when the serial port gets closed.  First, we
1067  * wait for the last remaining data to be sent.  Then, we unlink its
1068  * async structure from the interrupt chain if necessary, and we free
1069  * that IRQ if nothing is left in the chain.
1070  */
1071 static void mxser_close(struct tty_struct *tty, struct file *filp)
1072 {
1073         struct mxser_port *info = tty->driver_data;
1074         struct tty_port *port = &info->port;
1075 
1076         if (tty->index == MXSER_PORTS || info == NULL)
1077                 return;
1078         if (tty_port_close_start(port, tty, filp) == 0)
1079                 return;
1080         info->closing = 1;
1081         mutex_lock(&port->mutex);
1082         mxser_close_port(port);
1083         mxser_flush_buffer(tty);
1084         if (tty_port_initialized(port) && C_HUPCL(tty))
1085                 tty_port_lower_dtr_rts(port);
1086         mxser_shutdown_port(port);
1087         tty_port_set_initialized(port, 0);
1088         mutex_unlock(&port->mutex);
1089         info->closing = 0;
1090         /* Right now the tty_port set is done outside of the close_end helper
1091            as we don't yet have everyone using refcounts */     
1092         tty_port_close_end(port, tty);
1093         tty_port_tty_set(port, NULL);
1094 }
1095 
1096 static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
1097 {
1098         int c, total = 0;
1099         struct mxser_port *info = tty->driver_data;
1100         unsigned long flags;
1101 
1102         if (!info->port.xmit_buf)
1103                 return 0;
1104 
1105         while (1) {
1106                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1107                                           SERIAL_XMIT_SIZE - info->xmit_head));
1108                 if (c <= 0)
1109                         break;
1110 
1111                 memcpy(info->port.xmit_buf + info->xmit_head, buf, c);
1112                 spin_lock_irqsave(&info->slock, flags);
1113                 info->xmit_head = (info->xmit_head + c) &
1114                                   (SERIAL_XMIT_SIZE - 1);
1115                 info->xmit_cnt += c;
1116                 spin_unlock_irqrestore(&info->slock, flags);
1117 
1118                 buf += c;
1119                 count -= c;
1120                 total += c;
1121         }
1122 
1123         if (info->xmit_cnt && !tty->stopped) {
1124                 if (!tty->hw_stopped ||
1125                                 (info->type == PORT_16550A) ||
1126                                 (info->board->chip_flag)) {
1127                         spin_lock_irqsave(&info->slock, flags);
1128                         outb(info->IER & ~UART_IER_THRI, info->ioaddr +
1129                                         UART_IER);
1130                         info->IER |= UART_IER_THRI;
1131                         outb(info->IER, info->ioaddr + UART_IER);
1132                         spin_unlock_irqrestore(&info->slock, flags);
1133                 }
1134         }
1135         return total;
1136 }
1137 
1138 static int mxser_put_char(struct tty_struct *tty, unsigned char ch)
1139 {
1140         struct mxser_port *info = tty->driver_data;
1141         unsigned long flags;
1142 
1143         if (!info->port.xmit_buf)
1144                 return 0;
1145 
1146         if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1147                 return 0;
1148 
1149         spin_lock_irqsave(&info->slock, flags);
1150         info->port.xmit_buf[info->xmit_head++] = ch;
1151         info->xmit_head &= SERIAL_XMIT_SIZE - 1;
1152         info->xmit_cnt++;
1153         spin_unlock_irqrestore(&info->slock, flags);
1154         if (!tty->stopped) {
1155                 if (!tty->hw_stopped ||
1156                                 (info->type == PORT_16550A) ||
1157                                 info->board->chip_flag) {
1158                         spin_lock_irqsave(&info->slock, flags);
1159                         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1160                         info->IER |= UART_IER_THRI;
1161                         outb(info->IER, info->ioaddr + UART_IER);
1162                         spin_unlock_irqrestore(&info->slock, flags);
1163                 }
1164         }
1165         return 1;
1166 }
1167 
1168 
1169 static void mxser_flush_chars(struct tty_struct *tty)
1170 {
1171         struct mxser_port *info = tty->driver_data;
1172         unsigned long flags;
1173 
1174         if (info->xmit_cnt <= 0 || tty->stopped || !info->port.xmit_buf ||
1175                         (tty->hw_stopped && info->type != PORT_16550A &&
1176                          !info->board->chip_flag))
1177                 return;
1178 
1179         spin_lock_irqsave(&info->slock, flags);
1180 
1181         outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1182         info->IER |= UART_IER_THRI;
1183         outb(info->IER, info->ioaddr + UART_IER);
1184 
1185         spin_unlock_irqrestore(&info->slock, flags);
1186 }
1187 
1188 static int mxser_write_room(struct tty_struct *tty)
1189 {
1190         struct mxser_port *info = tty->driver_data;
1191         int ret;
1192 
1193         ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1194         return ret < 0 ? 0 : ret;
1195 }
1196 
1197 static int mxser_chars_in_buffer(struct tty_struct *tty)
1198 {
1199         struct mxser_port *info = tty->driver_data;
1200         return info->xmit_cnt;
1201 }
1202 
1203 /*
1204  * ------------------------------------------------------------
1205  * friends of mxser_ioctl()
1206  * ------------------------------------------------------------
1207  */
1208 static int mxser_get_serial_info(struct tty_struct *tty,
1209                 struct serial_struct __user *retinfo)
1210 {
1211         struct mxser_port *info = tty->driver_data;
1212         struct serial_struct tmp = {
1213                 .type = info->type,
1214                 .line = tty->index,
1215                 .port = info->ioaddr,
1216                 .irq = info->board->irq,
1217                 .flags = info->port.flags,
1218                 .baud_base = info->baud_base,
1219                 .close_delay = info->port.close_delay,
1220                 .closing_wait = info->port.closing_wait,
1221                 .custom_divisor = info->custom_divisor,
1222         };
1223         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1224                 return -EFAULT;
1225         return 0;
1226 }
1227 
1228 static int mxser_set_serial_info(struct tty_struct *tty,
1229                 struct serial_struct __user *new_info)
1230 {
1231         struct mxser_port *info = tty->driver_data;
1232         struct tty_port *port = &info->port;
1233         struct serial_struct new_serial;
1234         speed_t baud;
1235         unsigned long sl_flags;
1236         unsigned int flags;
1237         int retval = 0;
1238 
1239         if (!new_info || !info->ioaddr)
1240                 return -ENODEV;
1241         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1242                 return -EFAULT;
1243 
1244         if (new_serial.irq != info->board->irq ||
1245                         new_serial.port != info->ioaddr)
1246                 return -EINVAL;
1247 
1248         flags = port->flags & ASYNC_SPD_MASK;
1249 
1250         if (!capable(CAP_SYS_ADMIN)) {
1251                 if ((new_serial.baud_base != info->baud_base) ||
1252                                 (new_serial.close_delay != info->port.close_delay) ||
1253                                 ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1254                         return -EPERM;
1255                 info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1256                                 (new_serial.flags & ASYNC_USR_MASK));
1257         } else {
1258                 /*
1259                  * OK, past this point, all the error checking has been done.
1260                  * At this point, we start making changes.....
1261                  */
1262                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1263                                 (new_serial.flags & ASYNC_FLAGS));
1264                 port->close_delay = new_serial.close_delay * HZ / 100;
1265                 port->closing_wait = new_serial.closing_wait * HZ / 100;
1266                 port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1267                 if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1268                                 (new_serial.baud_base != info->baud_base ||
1269                                 new_serial.custom_divisor !=
1270                                 info->custom_divisor)) {
1271                         if (new_serial.custom_divisor == 0)
1272                                 return -EINVAL;
1273                         baud = new_serial.baud_base / new_serial.custom_divisor;
1274                         tty_encode_baud_rate(tty, baud, baud);
1275                 }
1276         }
1277 
1278         info->type = new_serial.type;
1279 
1280         process_txrx_fifo(info);
1281 
1282         if (tty_port_initialized(port)) {
1283                 if (flags != (port->flags & ASYNC_SPD_MASK)) {
1284                         spin_lock_irqsave(&info->slock, sl_flags);
1285                         mxser_change_speed(tty, NULL);
1286                         spin_unlock_irqrestore(&info->slock, sl_flags);
1287                 }
1288         } else {
1289                 retval = mxser_activate(port, tty);
1290                 if (retval == 0)
1291                         tty_port_set_initialized(port, 1);
1292         }
1293         return retval;
1294 }
1295 
1296 /*
1297  * mxser_get_lsr_info - get line status register info
1298  *
1299  * Purpose: Let user call ioctl() to get info when the UART physically
1300  *          is emptied.  On bus types like RS485, the transmitter must
1301  *          release the bus after transmitting. This must be done when
1302  *          the transmit shift register is empty, not be done when the
1303  *          transmit holding register is empty.  This functionality
1304  *          allows an RS485 driver to be written in user space.
1305  */
1306 static int mxser_get_lsr_info(struct mxser_port *info,
1307                 unsigned int __user *value)
1308 {
1309         unsigned char status;
1310         unsigned int result;
1311         unsigned long flags;
1312 
1313         spin_lock_irqsave(&info->slock, flags);
1314         status = inb(info->ioaddr + UART_LSR);
1315         spin_unlock_irqrestore(&info->slock, flags);
1316         result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1317         return put_user(result, value);
1318 }
1319 
1320 static int mxser_tiocmget(struct tty_struct *tty)
1321 {
1322         struct mxser_port *info = tty->driver_data;
1323         unsigned char control, status;
1324         unsigned long flags;
1325 
1326 
1327         if (tty->index == MXSER_PORTS)
1328                 return -ENOIOCTLCMD;
1329         if (tty_io_error(tty))
1330                 return -EIO;
1331 
1332         control = info->MCR;
1333 
1334         spin_lock_irqsave(&info->slock, flags);
1335         status = inb(info->ioaddr + UART_MSR);
1336         if (status & UART_MSR_ANY_DELTA)
1337                 mxser_check_modem_status(tty, info, status);
1338         spin_unlock_irqrestore(&info->slock, flags);
1339         return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1340                     ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1341                     ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1342                     ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1343                     ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1344                     ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1345 }
1346 
1347 static int mxser_tiocmset(struct tty_struct *tty,
1348                 unsigned int set, unsigned int clear)
1349 {
1350         struct mxser_port *info = tty->driver_data;
1351         unsigned long flags;
1352 
1353 
1354         if (tty->index == MXSER_PORTS)
1355                 return -ENOIOCTLCMD;
1356         if (tty_io_error(tty))
1357                 return -EIO;
1358 
1359         spin_lock_irqsave(&info->slock, flags);
1360 
1361         if (set & TIOCM_RTS)
1362                 info->MCR |= UART_MCR_RTS;
1363         if (set & TIOCM_DTR)
1364                 info->MCR |= UART_MCR_DTR;
1365 
1366         if (clear & TIOCM_RTS)
1367                 info->MCR &= ~UART_MCR_RTS;
1368         if (clear & TIOCM_DTR)
1369                 info->MCR &= ~UART_MCR_DTR;
1370 
1371         outb(info->MCR, info->ioaddr + UART_MCR);
1372         spin_unlock_irqrestore(&info->slock, flags);
1373         return 0;
1374 }
1375 
1376 static int __init mxser_program_mode(int port)
1377 {
1378         int id, i, j, n;
1379 
1380         outb(0, port);
1381         outb(0, port);
1382         outb(0, port);
1383         (void)inb(port);
1384         (void)inb(port);
1385         outb(0, port);
1386         (void)inb(port);
1387 
1388         id = inb(port + 1) & 0x1F;
1389         if ((id != C168_ASIC_ID) &&
1390                         (id != C104_ASIC_ID) &&
1391                         (id != C102_ASIC_ID) &&
1392                         (id != CI132_ASIC_ID) &&
1393                         (id != CI134_ASIC_ID) &&
1394                         (id != CI104J_ASIC_ID))
1395                 return -1;
1396         for (i = 0, j = 0; i < 4; i++) {
1397                 n = inb(port + 2);
1398                 if (n == 'M') {
1399                         j = 1;
1400                 } else if ((j == 1) && (n == 1)) {
1401                         j = 2;
1402                         break;
1403                 } else
1404                         j = 0;
1405         }
1406         if (j != 2)
1407                 id = -2;
1408         return id;
1409 }
1410 
1411 static void __init mxser_normal_mode(int port)
1412 {
1413         int i, n;
1414 
1415         outb(0xA5, port + 1);
1416         outb(0x80, port + 3);
1417         outb(12, port + 0);     /* 9600 bps */
1418         outb(0, port + 1);
1419         outb(0x03, port + 3);   /* 8 data bits */
1420         outb(0x13, port + 4);   /* loop back mode */
1421         for (i = 0; i < 16; i++) {
1422                 n = inb(port + 5);
1423                 if ((n & 0x61) == 0x60)
1424                         break;
1425                 if ((n & 1) == 1)
1426                         (void)inb(port);
1427         }
1428         outb(0x00, port + 4);
1429 }
1430 
1431 #define CHIP_SK         0x01    /* Serial Data Clock  in Eprom */
1432 #define CHIP_DO         0x02    /* Serial Data Output in Eprom */
1433 #define CHIP_CS         0x04    /* Serial Chip Select in Eprom */
1434 #define CHIP_DI         0x08    /* Serial Data Input  in Eprom */
1435 #define EN_CCMD         0x000   /* Chip's command register     */
1436 #define EN0_RSARLO      0x008   /* Remote start address reg 0  */
1437 #define EN0_RSARHI      0x009   /* Remote start address reg 1  */
1438 #define EN0_RCNTLO      0x00A   /* Remote byte count reg WR    */
1439 #define EN0_RCNTHI      0x00B   /* Remote byte count reg WR    */
1440 #define EN0_DCFG        0x00E   /* Data configuration reg WR   */
1441 #define EN0_PORT        0x010   /* Rcv missed frame error counter RD */
1442 #define ENC_PAGE0       0x000   /* Select page 0 of chip registers   */
1443 #define ENC_PAGE3       0x0C0   /* Select page 3 of chip registers   */
1444 static int __init mxser_read_register(int port, unsigned short *regs)
1445 {
1446         int i, k, value, id;
1447         unsigned int j;
1448 
1449         id = mxser_program_mode(port);
1450         if (id < 0)
1451                 return id;
1452         for (i = 0; i < 14; i++) {
1453                 k = (i & 0x3F) | 0x180;
1454                 for (j = 0x100; j > 0; j >>= 1) {
1455                         outb(CHIP_CS, port);
1456                         if (k & j) {
1457                                 outb(CHIP_CS | CHIP_DO, port);
1458                                 outb(CHIP_CS | CHIP_DO | CHIP_SK, port);        /* A? bit of read */
1459                         } else {
1460                                 outb(CHIP_CS, port);
1461                                 outb(CHIP_CS | CHIP_SK, port);  /* A? bit of read */
1462                         }
1463                 }
1464                 (void)inb(port);
1465                 value = 0;
1466                 for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1467                         outb(CHIP_CS, port);
1468                         outb(CHIP_CS | CHIP_SK, port);
1469                         if (inb(port) & CHIP_DI)
1470                                 value |= j;
1471                 }
1472                 regs[i] = value;
1473                 outb(0, port);
1474         }
1475         mxser_normal_mode(port);
1476         return id;
1477 }
1478 
1479 static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1480 {
1481         struct mxser_port *ip;
1482         struct tty_port *port;
1483         struct tty_struct *tty;
1484         int result, status;
1485         unsigned int i, j;
1486         int ret = 0;
1487 
1488         switch (cmd) {
1489         case MOXA_GET_MAJOR:
1490                 printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1491                                         "%x (GET_MAJOR), fix your userspace\n",
1492                                         current->comm, cmd);
1493                 return put_user(ttymajor, (int __user *)argp);
1494 
1495         case MOXA_CHKPORTENABLE:
1496                 result = 0;
1497                 for (i = 0; i < MXSER_BOARDS; i++)
1498                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1499                                 if (mxser_boards[i].ports[j].ioaddr)
1500                                         result |= (1 << i);
1501                 return put_user(result, (unsigned long __user *)argp);
1502         case MOXA_GETDATACOUNT:
1503                 /* The receive side is locked by port->slock but it isn't
1504                    clear that an exact snapshot is worth copying here */
1505                 if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1506                         ret = -EFAULT;
1507                 return ret;
1508         case MOXA_GETMSTATUS: {
1509                 struct mxser_mstatus ms, __user *msu = argp;
1510                 for (i = 0; i < MXSER_BOARDS; i++)
1511                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1512                                 ip = &mxser_boards[i].ports[j];
1513                                 port = &ip->port;
1514                                 memset(&ms, 0, sizeof(ms));
1515 
1516                                 mutex_lock(&port->mutex);
1517                                 if (!ip->ioaddr)
1518                                         goto copy;
1519                                 
1520                                 tty = tty_port_tty_get(port);
1521 
1522                                 if (!tty)
1523                                         ms.cflag = ip->normal_termios.c_cflag;
1524                                 else
1525                                         ms.cflag = tty->termios.c_cflag;
1526                                 tty_kref_put(tty);
1527                                 spin_lock_irq(&ip->slock);
1528                                 status = inb(ip->ioaddr + UART_MSR);
1529                                 spin_unlock_irq(&ip->slock);
1530                                 if (status & UART_MSR_DCD)
1531                                         ms.dcd = 1;
1532                                 if (status & UART_MSR_DSR)
1533                                         ms.dsr = 1;
1534                                 if (status & UART_MSR_CTS)
1535                                         ms.cts = 1;
1536                         copy:
1537                                 mutex_unlock(&port->mutex);
1538                                 if (copy_to_user(msu, &ms, sizeof(ms)))
1539                                         return -EFAULT;
1540                                 msu++;
1541                         }
1542                 return 0;
1543         }
1544         case MOXA_ASPP_MON_EXT: {
1545                 struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1546                 unsigned int cflag, iflag, p;
1547                 u8 opmode;
1548 
1549                 me = kzalloc(sizeof(*me), GFP_KERNEL);
1550                 if (!me)
1551                         return -ENOMEM;
1552 
1553                 for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1554                         for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1555                                 if (p >= ARRAY_SIZE(me->rx_cnt)) {
1556                                         i = MXSER_BOARDS;
1557                                         break;
1558                                 }
1559                                 ip = &mxser_boards[i].ports[j];
1560                                 port = &ip->port;
1561 
1562                                 mutex_lock(&port->mutex);
1563                                 if (!ip->ioaddr) {
1564                                         mutex_unlock(&port->mutex);
1565                                         continue;
1566                                 }
1567 
1568                                 spin_lock_irq(&ip->slock);
1569                                 status = mxser_get_msr(ip->ioaddr, 0, p);
1570 
1571                                 if (status & UART_MSR_TERI)
1572                                         ip->icount.rng++;
1573                                 if (status & UART_MSR_DDSR)
1574                                         ip->icount.dsr++;
1575                                 if (status & UART_MSR_DDCD)
1576                                         ip->icount.dcd++;
1577                                 if (status & UART_MSR_DCTS)
1578                                         ip->icount.cts++;
1579 
1580                                 ip->mon_data.modem_status = status;
1581                                 me->rx_cnt[p] = ip->mon_data.rxcnt;
1582                                 me->tx_cnt[p] = ip->mon_data.txcnt;
1583                                 me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1584                                 me->up_txcnt[p] = ip->mon_data.up_txcnt;
1585                                 me->modem_status[p] =
1586                                         ip->mon_data.modem_status;
1587                                 spin_unlock_irq(&ip->slock);
1588 
1589                                 tty = tty_port_tty_get(&ip->port);
1590 
1591                                 if (!tty) {
1592                                         cflag = ip->normal_termios.c_cflag;
1593                                         iflag = ip->normal_termios.c_iflag;
1594                                         me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1595                                 } else {
1596                                         cflag = tty->termios.c_cflag;
1597                                         iflag = tty->termios.c_iflag;
1598                                         me->baudrate[p] = tty_get_baud_rate(tty);
1599                                 }
1600                                 tty_kref_put(tty);
1601 
1602                                 me->databits[p] = cflag & CSIZE;
1603                                 me->stopbits[p] = cflag & CSTOPB;
1604                                 me->parity[p] = cflag & (PARENB | PARODD |
1605                                                 CMSPAR);
1606 
1607                                 if (cflag & CRTSCTS)
1608                                         me->flowctrl[p] |= 0x03;
1609 
1610                                 if (iflag & (IXON | IXOFF))
1611                                         me->flowctrl[p] |= 0x0C;
1612 
1613                                 if (ip->type == PORT_16550A)
1614                                         me->fifo[p] = 1;
1615 
1616                                 if (ip->board->chip_flag == MOXA_MUST_MU860_HWID) {
1617                                         opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1618                                         opmode &= OP_MODE_MASK;
1619                                 } else {
1620                                         opmode = RS232_MODE;
1621                                 }
1622                                 me->iftype[p] = opmode;
1623                                 mutex_unlock(&port->mutex);
1624                         }
1625                 }
1626                 if (copy_to_user(argp, me, sizeof(*me)))
1627                         ret = -EFAULT;
1628                 kfree(me);
1629                 return ret;
1630         }
1631         default:
1632                 return -ENOIOCTLCMD;
1633         }
1634         return 0;
1635 }
1636 
1637 static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1638                 struct async_icount *cprev)
1639 {
1640         struct async_icount cnow;
1641         unsigned long flags;
1642         int ret;
1643 
1644         spin_lock_irqsave(&info->slock, flags);
1645         cnow = info->icount;    /* atomic copy */
1646         spin_unlock_irqrestore(&info->slock, flags);
1647 
1648         ret =   ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1649                 ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1650                 ((arg & TIOCM_CD)  && (cnow.dcd != cprev->dcd)) ||
1651                 ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1652 
1653         *cprev = cnow;
1654 
1655         return ret;
1656 }
1657 
1658 static int mxser_ioctl(struct tty_struct *tty,
1659                 unsigned int cmd, unsigned long arg)
1660 {
1661         struct mxser_port *info = tty->driver_data;
1662         struct tty_port *port = &info->port;
1663         struct async_icount cnow;
1664         unsigned long flags;
1665         void __user *argp = (void __user *)arg;
1666         int retval;
1667 
1668         if (tty->index == MXSER_PORTS)
1669                 return mxser_ioctl_special(cmd, argp);
1670 
1671         if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1672                 int p;
1673                 unsigned long opmode;
1674                 static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1675                 int shiftbit;
1676                 unsigned char val, mask;
1677 
1678                 if (info->board->chip_flag != MOXA_MUST_MU860_HWID)
1679                         return -EFAULT;
1680 
1681                 p = tty->index % 4;
1682                 if (cmd == MOXA_SET_OP_MODE) {
1683                         if (get_user(opmode, (int __user *) argp))
1684                                 return -EFAULT;
1685                         if (opmode != RS232_MODE &&
1686                                         opmode != RS485_2WIRE_MODE &&
1687                                         opmode != RS422_MODE &&
1688                                         opmode != RS485_4WIRE_MODE)
1689                                 return -EFAULT;
1690                         mask = ModeMask[p];
1691                         shiftbit = p * 2;
1692                         spin_lock_irq(&info->slock);
1693                         val = inb(info->opmode_ioaddr);
1694                         val &= mask;
1695                         val |= (opmode << shiftbit);
1696                         outb(val, info->opmode_ioaddr);
1697                         spin_unlock_irq(&info->slock);
1698                 } else {
1699                         shiftbit = p * 2;
1700                         spin_lock_irq(&info->slock);
1701                         opmode = inb(info->opmode_ioaddr) >> shiftbit;
1702                         spin_unlock_irq(&info->slock);
1703                         opmode &= OP_MODE_MASK;
1704                         if (put_user(opmode, (int __user *)argp))
1705                                 return -EFAULT;
1706                 }
1707                 return 0;
1708         }
1709 
1710         if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT && tty_io_error(tty))
1711                 return -EIO;
1712 
1713         switch (cmd) {
1714         case TIOCGSERIAL:
1715                 mutex_lock(&port->mutex);
1716                 retval = mxser_get_serial_info(tty, argp);
1717                 mutex_unlock(&port->mutex);
1718                 return retval;
1719         case TIOCSSERIAL:
1720                 mutex_lock(&port->mutex);
1721                 retval = mxser_set_serial_info(tty, argp);
1722                 mutex_unlock(&port->mutex);
1723                 return retval;
1724         case TIOCSERGETLSR:     /* Get line status register */
1725                 return  mxser_get_lsr_info(info, argp);
1726                 /*
1727                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1728                  * - mask passed in arg for lines of interest
1729                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1730                  * Caller should use TIOCGICOUNT to see which one it was
1731                  */
1732         case TIOCMIWAIT:
1733                 spin_lock_irqsave(&info->slock, flags);
1734                 cnow = info->icount;    /* note the counters on entry */
1735                 spin_unlock_irqrestore(&info->slock, flags);
1736 
1737                 return wait_event_interruptible(info->port.delta_msr_wait,
1738                                 mxser_cflags_changed(info, arg, &cnow));
1739         case MOXA_HighSpeedOn:
1740                 return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1741         case MOXA_SDS_RSTICOUNTER:
1742                 spin_lock_irq(&info->slock);
1743                 info->mon_data.rxcnt = 0;
1744                 info->mon_data.txcnt = 0;
1745                 spin_unlock_irq(&info->slock);
1746                 return 0;
1747 
1748         case MOXA_ASPP_OQUEUE:{
1749                 int len, lsr;
1750 
1751                 len = mxser_chars_in_buffer(tty);
1752                 spin_lock_irq(&info->slock);
1753                 lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1754                 spin_unlock_irq(&info->slock);
1755                 len += (lsr ? 0 : 1);
1756 
1757                 return put_user(len, (int __user *)argp);
1758         }
1759         case MOXA_ASPP_MON: {
1760                 int mcr, status;
1761 
1762                 spin_lock_irq(&info->slock);
1763                 status = mxser_get_msr(info->ioaddr, 1, tty->index);
1764                 mxser_check_modem_status(tty, info, status);
1765 
1766                 mcr = inb(info->ioaddr + UART_MCR);
1767                 spin_unlock_irq(&info->slock);
1768 
1769                 if (mcr & MOXA_MUST_MCR_XON_FLAG)
1770                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1771                 else
1772                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1773 
1774                 if (mcr & MOXA_MUST_MCR_TX_XON)
1775                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1776                 else
1777                         info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1778 
1779                 if (tty->hw_stopped)
1780                         info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1781                 else
1782                         info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1783 
1784                 if (copy_to_user(argp, &info->mon_data,
1785                                 sizeof(struct mxser_mon)))
1786                         return -EFAULT;
1787 
1788                 return 0;
1789         }
1790         case MOXA_ASPP_LSTATUS: {
1791                 if (put_user(info->err_shadow, (unsigned char __user *)argp))
1792                         return -EFAULT;
1793 
1794                 info->err_shadow = 0;
1795                 return 0;
1796         }
1797         case MOXA_SET_BAUD_METHOD: {
1798                 int method;
1799 
1800                 if (get_user(method, (int __user *)argp))
1801                         return -EFAULT;
1802                 mxser_set_baud_method[tty->index] = method;
1803                 return put_user(method, (int __user *)argp);
1804         }
1805         default:
1806                 return -ENOIOCTLCMD;
1807         }
1808         return 0;
1809 }
1810 
1811         /*
1812          * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1813          * Return: write counters to the user passed counter struct
1814          * NB: both 1->0 and 0->1 transitions are counted except for
1815          *     RI where only 0->1 is counted.
1816          */
1817 
1818 static int mxser_get_icount(struct tty_struct *tty,
1819                 struct serial_icounter_struct *icount)
1820 
1821 {
1822         struct mxser_port *info = tty->driver_data;
1823         struct async_icount cnow;
1824         unsigned long flags;
1825 
1826         spin_lock_irqsave(&info->slock, flags);
1827         cnow = info->icount;
1828         spin_unlock_irqrestore(&info->slock, flags);
1829 
1830         icount->frame = cnow.frame;
1831         icount->brk = cnow.brk;
1832         icount->overrun = cnow.overrun;
1833         icount->buf_overrun = cnow.buf_overrun;
1834         icount->parity = cnow.parity;
1835         icount->rx = cnow.rx;
1836         icount->tx = cnow.tx;
1837         icount->cts = cnow.cts;
1838         icount->dsr = cnow.dsr;
1839         icount->rng = cnow.rng;
1840         icount->dcd = cnow.dcd;
1841         return 0;
1842 }
1843 
1844 static void mxser_stoprx(struct tty_struct *tty)
1845 {
1846         struct mxser_port *info = tty->driver_data;
1847 
1848         info->ldisc_stop_rx = 1;
1849         if (I_IXOFF(tty)) {
1850                 if (info->board->chip_flag) {
1851                         info->IER &= ~MOXA_MUST_RECV_ISR;
1852                         outb(info->IER, info->ioaddr + UART_IER);
1853                 } else {
1854                         info->x_char = STOP_CHAR(tty);
1855                         outb(0, info->ioaddr + UART_IER);
1856                         info->IER |= UART_IER_THRI;
1857                         outb(info->IER, info->ioaddr + UART_IER);
1858                 }
1859         }
1860 
1861         if (C_CRTSCTS(tty)) {
1862                 info->MCR &= ~UART_MCR_RTS;
1863                 outb(info->MCR, info->ioaddr + UART_MCR);
1864         }
1865 }
1866 
1867 /*
1868  * This routine is called by the upper-layer tty layer to signal that
1869  * incoming characters should be throttled.
1870  */
1871 static void mxser_throttle(struct tty_struct *tty)
1872 {
1873         mxser_stoprx(tty);
1874 }
1875 
1876 static void mxser_unthrottle(struct tty_struct *tty)
1877 {
1878         struct mxser_port *info = tty->driver_data;
1879 
1880         /* startrx */
1881         info->ldisc_stop_rx = 0;
1882         if (I_IXOFF(tty)) {
1883                 if (info->x_char)
1884                         info->x_char = 0;
1885                 else {
1886                         if (info->board->chip_flag) {
1887                                 info->IER |= MOXA_MUST_RECV_ISR;
1888                                 outb(info->IER, info->ioaddr + UART_IER);
1889                         } else {
1890                                 info->x_char = START_CHAR(tty);
1891                                 outb(0, info->ioaddr + UART_IER);
1892                                 info->IER |= UART_IER_THRI;
1893                                 outb(info->IER, info->ioaddr + UART_IER);
1894                         }
1895                 }
1896         }
1897 
1898         if (C_CRTSCTS(tty)) {
1899                 info->MCR |= UART_MCR_RTS;
1900                 outb(info->MCR, info->ioaddr + UART_MCR);
1901         }
1902 }
1903 
1904 /*
1905  * mxser_stop() and mxser_start()
1906  *
1907  * This routines are called before setting or resetting tty->stopped.
1908  * They enable or disable transmitter interrupts, as necessary.
1909  */
1910 static void mxser_stop(struct tty_struct *tty)
1911 {
1912         struct mxser_port *info = tty->driver_data;
1913         unsigned long flags;
1914 
1915         spin_lock_irqsave(&info->slock, flags);
1916         if (info->IER & UART_IER_THRI) {
1917                 info->IER &= ~UART_IER_THRI;
1918                 outb(info->IER, info->ioaddr + UART_IER);
1919         }
1920         spin_unlock_irqrestore(&info->slock, flags);
1921 }
1922 
1923 static void mxser_start(struct tty_struct *tty)
1924 {
1925         struct mxser_port *info = tty->driver_data;
1926         unsigned long flags;
1927 
1928         spin_lock_irqsave(&info->slock, flags);
1929         if (info->xmit_cnt && info->port.xmit_buf) {
1930                 outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1931                 info->IER |= UART_IER_THRI;
1932                 outb(info->IER, info->ioaddr + UART_IER);
1933         }
1934         spin_unlock_irqrestore(&info->slock, flags);
1935 }
1936 
1937 static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1938 {
1939         struct mxser_port *info = tty->driver_data;
1940         unsigned long flags;
1941 
1942         spin_lock_irqsave(&info->slock, flags);
1943         mxser_change_speed(tty, old_termios);
1944         spin_unlock_irqrestore(&info->slock, flags);
1945 
1946         if ((old_termios->c_cflag & CRTSCTS) && !C_CRTSCTS(tty)) {
1947                 tty->hw_stopped = 0;
1948                 mxser_start(tty);
1949         }
1950 
1951         /* Handle sw stopped */
1952         if ((old_termios->c_iflag & IXON) && !I_IXON(tty)) {
1953                 tty->stopped = 0;
1954 
1955                 if (info->board->chip_flag) {
1956                         spin_lock_irqsave(&info->slock, flags);
1957                         mxser_disable_must_rx_software_flow_control(
1958                                         info->ioaddr);
1959                         spin_unlock_irqrestore(&info->slock, flags);
1960                 }
1961 
1962                 mxser_start(tty);
1963         }
1964 }
1965 
1966 /*
1967  * mxser_wait_until_sent() --- wait until the transmitter is empty
1968  */
1969 static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1970 {
1971         struct mxser_port *info = tty->driver_data;
1972         unsigned long orig_jiffies, char_time;
1973         unsigned long flags;
1974         int lsr;
1975 
1976         if (info->type == PORT_UNKNOWN)
1977                 return;
1978 
1979         if (info->xmit_fifo_size == 0)
1980                 return;         /* Just in case.... */
1981 
1982         orig_jiffies = jiffies;
1983         /*
1984          * Set the check interval to be 1/5 of the estimated time to
1985          * send a single character, and make it at least 1.  The check
1986          * interval should also be less than the timeout.
1987          *
1988          * Note: we have to use pretty tight timings here to satisfy
1989          * the NIST-PCTS.
1990          */
1991         char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1992         char_time = char_time / 5;
1993         if (char_time == 0)
1994                 char_time = 1;
1995         if (timeout && timeout < char_time)
1996                 char_time = timeout;
1997         /*
1998          * If the transmitter hasn't cleared in twice the approximate
1999          * amount of time to send the entire FIFO, it probably won't
2000          * ever clear.  This assumes the UART isn't doing flow
2001          * control, which is currently the case.  Hence, if it ever
2002          * takes longer than info->timeout, this is probably due to a
2003          * UART bug of some kind.  So, we clamp the timeout parameter at
2004          * 2*info->timeout.
2005          */
2006         if (!timeout || timeout > 2 * info->timeout)
2007                 timeout = 2 * info->timeout;
2008 
2009         spin_lock_irqsave(&info->slock, flags);
2010         while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2011                 spin_unlock_irqrestore(&info->slock, flags);
2012                 schedule_timeout_interruptible(char_time);
2013                 spin_lock_irqsave(&info->slock, flags);
2014                 if (signal_pending(current))
2015                         break;
2016                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
2017                         break;
2018         }
2019         spin_unlock_irqrestore(&info->slock, flags);
2020         set_current_state(TASK_RUNNING);
2021 }
2022 
2023 /*
2024  * This routine is called by tty_hangup() when a hangup is signaled.
2025  */
2026 static void mxser_hangup(struct tty_struct *tty)
2027 {
2028         struct mxser_port *info = tty->driver_data;
2029 
2030         mxser_flush_buffer(tty);
2031         tty_port_hangup(&info->port);
2032 }
2033 
2034 /*
2035  * mxser_rs_break() --- routine which turns the break handling on or off
2036  */
2037 static int mxser_rs_break(struct tty_struct *tty, int break_state)
2038 {
2039         struct mxser_port *info = tty->driver_data;
2040         unsigned long flags;
2041 
2042         spin_lock_irqsave(&info->slock, flags);
2043         if (break_state == -1)
2044                 outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2045                         info->ioaddr + UART_LCR);
2046         else
2047                 outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2048                         info->ioaddr + UART_LCR);
2049         spin_unlock_irqrestore(&info->slock, flags);
2050         return 0;
2051 }
2052 
2053 static void mxser_receive_chars(struct tty_struct *tty,
2054                                 struct mxser_port *port, int *status)
2055 {
2056         unsigned char ch, gdl;
2057         int ignored = 0;
2058         int cnt = 0;
2059         int recv_room;
2060         int max = 256;
2061 
2062         recv_room = tty->receive_room;
2063         if (recv_room == 0 && !port->ldisc_stop_rx)
2064                 mxser_stoprx(tty);
2065         if (port->board->chip_flag != MOXA_OTHER_UART) {
2066 
2067                 if (*status & UART_LSR_SPECIAL)
2068                         goto intr_old;
2069                 if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2070                                 (*status & MOXA_MUST_LSR_RERR))
2071                         goto intr_old;
2072                 if (*status & MOXA_MUST_LSR_RERR)
2073                         goto intr_old;
2074 
2075                 gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2076 
2077                 if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2078                         gdl &= MOXA_MUST_GDL_MASK;
2079                 if (gdl >= recv_room) {
2080                         if (!port->ldisc_stop_rx)
2081                                 mxser_stoprx(tty);
2082                 }
2083                 while (gdl--) {
2084                         ch = inb(port->ioaddr + UART_RX);
2085                         tty_insert_flip_char(&port->port, ch, 0);
2086                         cnt++;
2087                 }
2088                 goto end_intr;
2089         }
2090 intr_old:
2091 
2092         do {
2093                 if (max-- < 0)
2094                         break;
2095 
2096                 ch = inb(port->ioaddr + UART_RX);
2097                 if (port->board->chip_flag && (*status & UART_LSR_OE))
2098                         outb(0x23, port->ioaddr + UART_FCR);
2099                 *status &= port->read_status_mask;
2100                 if (*status & port->ignore_status_mask) {
2101                         if (++ignored > 100)
2102                                 break;
2103                 } else {
2104                         char flag = 0;
2105                         if (*status & UART_LSR_SPECIAL) {
2106                                 if (*status & UART_LSR_BI) {
2107                                         flag = TTY_BREAK;
2108                                         port->icount.brk++;
2109 
2110                                         if (port->port.flags & ASYNC_SAK)
2111                                                 do_SAK(tty);
2112                                 } else if (*status & UART_LSR_PE) {
2113                                         flag = TTY_PARITY;
2114                                         port->icount.parity++;
2115                                 } else if (*status & UART_LSR_FE) {
2116                                         flag = TTY_FRAME;
2117                                         port->icount.frame++;
2118                                 } else if (*status & UART_LSR_OE) {
2119                                         flag = TTY_OVERRUN;
2120                                         port->icount.overrun++;
2121                                 } else
2122                                         flag = TTY_BREAK;
2123                         }
2124                         tty_insert_flip_char(&port->port, ch, flag);
2125                         cnt++;
2126                         if (cnt >= recv_room) {
2127                                 if (!port->ldisc_stop_rx)
2128                                         mxser_stoprx(tty);
2129                                 break;
2130                         }
2131 
2132                 }
2133 
2134                 if (port->board->chip_flag)
2135                         break;
2136 
2137                 *status = inb(port->ioaddr + UART_LSR);
2138         } while (*status & UART_LSR_DR);
2139 
2140 end_intr:
2141         mxvar_log.rxcnt[tty->index] += cnt;
2142         port->mon_data.rxcnt += cnt;
2143         port->mon_data.up_rxcnt += cnt;
2144 
2145         /*
2146          * We are called from an interrupt context with &port->slock
2147          * being held. Drop it temporarily in order to prevent
2148          * recursive locking.
2149          */
2150         spin_unlock(&port->slock);
2151         tty_flip_buffer_push(&port->port);
2152         spin_lock(&port->slock);
2153 }
2154 
2155 static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2156 {
2157         int count, cnt;
2158 
2159         if (port->x_char) {
2160                 outb(port->x_char, port->ioaddr + UART_TX);
2161                 port->x_char = 0;
2162                 mxvar_log.txcnt[tty->index]++;
2163                 port->mon_data.txcnt++;
2164                 port->mon_data.up_txcnt++;
2165                 port->icount.tx++;
2166                 return;
2167         }
2168 
2169         if (port->port.xmit_buf == NULL)
2170                 return;
2171 
2172         if (port->xmit_cnt <= 0 || tty->stopped ||
2173                         (tty->hw_stopped &&
2174                         (port->type != PORT_16550A) &&
2175                         (!port->board->chip_flag))) {
2176                 port->IER &= ~UART_IER_THRI;
2177                 outb(port->IER, port->ioaddr + UART_IER);
2178                 return;
2179         }
2180 
2181         cnt = port->xmit_cnt;
2182         count = port->xmit_fifo_size;
2183         do {
2184                 outb(port->port.xmit_buf[port->xmit_tail++],
2185                         port->ioaddr + UART_TX);
2186                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2187                 if (--port->xmit_cnt <= 0)
2188                         break;
2189         } while (--count > 0);
2190         mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2191 
2192         port->mon_data.txcnt += (cnt - port->xmit_cnt);
2193         port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2194         port->icount.tx += (cnt - port->xmit_cnt);
2195 
2196         if (port->xmit_cnt < WAKEUP_CHARS)
2197                 tty_wakeup(tty);
2198 
2199         if (port->xmit_cnt <= 0) {
2200                 port->IER &= ~UART_IER_THRI;
2201                 outb(port->IER, port->ioaddr + UART_IER);
2202         }
2203 }
2204 
2205 /*
2206  * This is the serial driver's generic interrupt routine
2207  */
2208 static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2209 {
2210         int status, iir, i;
2211         struct mxser_board *brd = NULL;
2212         struct mxser_port *port;
2213         int max, irqbits, bits, msr;
2214         unsigned int int_cnt, pass_counter = 0;
2215         int handled = IRQ_NONE;
2216         struct tty_struct *tty;
2217 
2218         for (i = 0; i < MXSER_BOARDS; i++)
2219                 if (dev_id == &mxser_boards[i]) {
2220                         brd = dev_id;
2221                         break;
2222                 }
2223 
2224         if (i == MXSER_BOARDS)
2225                 goto irq_stop;
2226         if (brd == NULL)
2227                 goto irq_stop;
2228         max = brd->info->nports;
2229         while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2230                 irqbits = inb(brd->vector) & brd->vector_mask;
2231                 if (irqbits == brd->vector_mask)
2232                         break;
2233 
2234                 handled = IRQ_HANDLED;
2235                 for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2236                         if (irqbits == brd->vector_mask)
2237                                 break;
2238                         if (bits & irqbits)
2239                                 continue;
2240                         port = &brd->ports[i];
2241 
2242                         int_cnt = 0;
2243                         spin_lock(&port->slock);
2244                         do {
2245                                 iir = inb(port->ioaddr + UART_IIR);
2246                                 if (iir & UART_IIR_NO_INT)
2247                                         break;
2248                                 iir &= MOXA_MUST_IIR_MASK;
2249                                 tty = tty_port_tty_get(&port->port);
2250                                 if (!tty || port->closing ||
2251                                     !tty_port_initialized(&port->port)) {
2252                                         status = inb(port->ioaddr + UART_LSR);
2253                                         outb(0x27, port->ioaddr + UART_FCR);
2254                                         inb(port->ioaddr + UART_MSR);
2255                                         tty_kref_put(tty);
2256                                         break;
2257                                 }
2258 
2259                                 status = inb(port->ioaddr + UART_LSR);
2260 
2261                                 if (status & UART_LSR_PE)
2262                                         port->err_shadow |= NPPI_NOTIFY_PARITY;
2263                                 if (status & UART_LSR_FE)
2264                                         port->err_shadow |= NPPI_NOTIFY_FRAMING;
2265                                 if (status & UART_LSR_OE)
2266                                         port->err_shadow |=
2267                                                 NPPI_NOTIFY_HW_OVERRUN;
2268                                 if (status & UART_LSR_BI)
2269                                         port->err_shadow |= NPPI_NOTIFY_BREAK;
2270 
2271                                 if (port->board->chip_flag) {
2272                                         if (iir == MOXA_MUST_IIR_GDA ||
2273                                             iir == MOXA_MUST_IIR_RDA ||
2274                                             iir == MOXA_MUST_IIR_RTO ||
2275                                             iir == MOXA_MUST_IIR_LSR)
2276                                                 mxser_receive_chars(tty, port,
2277                                                                 &status);
2278 
2279                                 } else {
2280                                         status &= port->read_status_mask;
2281                                         if (status & UART_LSR_DR)
2282                                                 mxser_receive_chars(tty, port,
2283                                                                 &status);
2284                                 }
2285                                 msr = inb(port->ioaddr + UART_MSR);
2286                                 if (msr & UART_MSR_ANY_DELTA)
2287                                         mxser_check_modem_status(tty, port, msr);
2288 
2289                                 if (port->board->chip_flag) {
2290                                         if (iir == 0x02 && (status &
2291                                                                 UART_LSR_THRE))
2292                                                 mxser_transmit_chars(tty, port);
2293                                 } else {
2294                                         if (status & UART_LSR_THRE)
2295                                                 mxser_transmit_chars(tty, port);
2296                                 }
2297                                 tty_kref_put(tty);
2298                         } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2299                         spin_unlock(&port->slock);
2300                 }
2301         }
2302 
2303 irq_stop:
2304         return handled;
2305 }
2306 
2307 static const struct tty_operations mxser_ops = {
2308         .open = mxser_open,
2309         .close = mxser_close,
2310         .write = mxser_write,
2311         .put_char = mxser_put_char,
2312         .flush_chars = mxser_flush_chars,
2313         .write_room = mxser_write_room,
2314         .chars_in_buffer = mxser_chars_in_buffer,
2315         .flush_buffer = mxser_flush_buffer,
2316         .ioctl = mxser_ioctl,
2317         .throttle = mxser_throttle,
2318         .unthrottle = mxser_unthrottle,
2319         .set_termios = mxser_set_termios,
2320         .stop = mxser_stop,
2321         .start = mxser_start,
2322         .hangup = mxser_hangup,
2323         .break_ctl = mxser_rs_break,
2324         .wait_until_sent = mxser_wait_until_sent,
2325         .tiocmget = mxser_tiocmget,
2326         .tiocmset = mxser_tiocmset,
2327         .get_icount = mxser_get_icount,
2328 };
2329 
2330 static const struct tty_port_operations mxser_port_ops = {
2331         .carrier_raised = mxser_carrier_raised,
2332         .dtr_rts = mxser_dtr_rts,
2333         .activate = mxser_activate,
2334         .shutdown = mxser_shutdown_port,
2335 };
2336 
2337 /*
2338  * The MOXA Smartio/Industio serial driver boot-time initialization code!
2339  */
2340 
2341 static bool allow_overlapping_vector;
2342 module_param(allow_overlapping_vector, bool, S_IRUGO);
2343 MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2344 
2345 static bool mxser_overlapping_vector(struct mxser_board *brd)
2346 {
2347         return allow_overlapping_vector &&
2348                 brd->vector >= brd->ports[0].ioaddr &&
2349                 brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2350 }
2351 
2352 static int mxser_request_vector(struct mxser_board *brd)
2353 {
2354         if (mxser_overlapping_vector(brd))
2355                 return 0;
2356         return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2357 }
2358 
2359 static void mxser_release_vector(struct mxser_board *brd)
2360 {
2361         if (mxser_overlapping_vector(brd))
2362                 return;
2363         release_region(brd->vector, 1);
2364 }
2365 
2366 static void mxser_release_ISA_res(struct mxser_board *brd)
2367 {
2368         release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2369         mxser_release_vector(brd);
2370 }
2371 
2372 static int mxser_initbrd(struct mxser_board *brd,
2373                 struct pci_dev *pdev)
2374 {
2375         struct mxser_port *info;
2376         unsigned int i;
2377         int retval;
2378 
2379         printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2380                         brd->ports[0].max_baud);
2381 
2382         for (i = 0; i < brd->info->nports; i++) {
2383                 info = &brd->ports[i];
2384                 tty_port_init(&info->port);
2385                 info->port.ops = &mxser_port_ops;
2386                 info->board = brd;
2387                 info->stop_rx = 0;
2388                 info->ldisc_stop_rx = 0;
2389 
2390                 /* Enhance mode enabled here */
2391                 if (brd->chip_flag != MOXA_OTHER_UART)
2392                         mxser_enable_must_enchance_mode(info->ioaddr);
2393 
2394                 info->type = brd->uart_type;
2395 
2396                 process_txrx_fifo(info);
2397 
2398                 info->custom_divisor = info->baud_base * 16;
2399                 info->port.close_delay = 5 * HZ / 10;
2400                 info->port.closing_wait = 30 * HZ;
2401                 info->normal_termios = mxvar_sdriver->init_termios;
2402                 memset(&info->mon_data, 0, sizeof(struct mxser_mon));
2403                 info->err_shadow = 0;
2404                 spin_lock_init(&info->slock);
2405 
2406                 /* before set INT ISR, disable all int */
2407                 outb(inb(info->ioaddr + UART_IER) & 0xf0,
2408                         info->ioaddr + UART_IER);
2409         }
2410 
2411         retval = request_irq(brd->irq, mxser_interrupt, IRQF_SHARED, "mxser",
2412                         brd);
2413         if (retval) {
2414                 for (i = 0; i < brd->info->nports; i++)
2415                         tty_port_destroy(&brd->ports[i].port);
2416                 printk(KERN_ERR "Board %s: Request irq failed, IRQ (%d) may "
2417                         "conflict with another device.\n",
2418                         brd->info->name, brd->irq);
2419         }
2420 
2421         return retval;
2422 }
2423 
2424 static void mxser_board_remove(struct mxser_board *brd)
2425 {
2426         unsigned int i;
2427 
2428         for (i = 0; i < brd->info->nports; i++) {
2429                 tty_unregister_device(mxvar_sdriver, brd->idx + i);
2430                 tty_port_destroy(&brd->ports[i].port);
2431         }
2432         free_irq(brd->irq, brd);
2433 }
2434 
2435 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
2436 {
2437         int id, i, bits, ret;
2438         unsigned short regs[16], irq;
2439         unsigned char scratch, scratch2;
2440 
2441         brd->chip_flag = MOXA_OTHER_UART;
2442 
2443         id = mxser_read_register(cap, regs);
2444         switch (id) {
2445         case C168_ASIC_ID:
2446                 brd->info = &mxser_cards[0];
2447                 break;
2448         case C104_ASIC_ID:
2449                 brd->info = &mxser_cards[1];
2450                 break;
2451         case CI104J_ASIC_ID:
2452                 brd->info = &mxser_cards[2];
2453                 break;
2454         case C102_ASIC_ID:
2455                 brd->info = &mxser_cards[5];
2456                 break;
2457         case CI132_ASIC_ID:
2458                 brd->info = &mxser_cards[6];
2459                 break;
2460         case CI134_ASIC_ID:
2461                 brd->info = &mxser_cards[7];
2462                 break;
2463         default:
2464                 return 0;
2465         }
2466 
2467         irq = 0;
2468         /* some ISA cards have 2 ports, but we want to see them as 4-port (why?)
2469            Flag-hack checks if configuration should be read as 2-port here. */
2470         if (brd->info->nports == 2 || (brd->info->flags & MXSER_HAS2)) {
2471                 irq = regs[9] & 0xF000;
2472                 irq = irq | (irq >> 4);
2473                 if (irq != (regs[9] & 0xFF00))
2474                         goto err_irqconflict;
2475         } else if (brd->info->nports == 4) {
2476                 irq = regs[9] & 0xF000;
2477                 irq = irq | (irq >> 4);
2478                 irq = irq | (irq >> 8);
2479                 if (irq != regs[9])
2480                         goto err_irqconflict;
2481         } else if (brd->info->nports == 8) {
2482                 irq = regs[9] & 0xF000;
2483                 irq = irq | (irq >> 4);
2484                 irq = irq | (irq >> 8);
2485                 if ((irq != regs[9]) || (irq != regs[10]))
2486                         goto err_irqconflict;
2487         }
2488 
2489         if (!irq) {
2490                 printk(KERN_ERR "mxser: interrupt number unset\n");
2491                 return -EIO;
2492         }
2493         brd->irq = ((int)(irq & 0xF000) >> 12);
2494         for (i = 0; i < 8; i++)
2495                 brd->ports[i].ioaddr = (int) regs[i + 1] & 0xFFF8;
2496         if ((regs[12] & 0x80) == 0) {
2497                 printk(KERN_ERR "mxser: invalid interrupt vector\n");
2498                 return -EIO;
2499         }
2500         brd->vector = (int)regs[11];    /* interrupt vector */
2501         if (id == 1)
2502                 brd->vector_mask = 0x00FF;
2503         else
2504                 brd->vector_mask = 0x000F;
2505         for (i = 7, bits = 0x0100; i >= 0; i--, bits <<= 1) {
2506                 if (regs[12] & bits) {
2507                         brd->ports[i].baud_base = 921600;
2508                         brd->ports[i].max_baud = 921600;
2509                 } else {
2510                         brd->ports[i].baud_base = 115200;
2511                         brd->ports[i].max_baud = 115200;
2512                 }
2513         }
2514         scratch2 = inb(cap + UART_LCR) & (~UART_LCR_DLAB);
2515         outb(scratch2 | UART_LCR_DLAB, cap + UART_LCR);
2516         outb(0, cap + UART_EFR);        /* EFR is the same as FCR */
2517         outb(scratch2, cap + UART_LCR);
2518         outb(UART_FCR_ENABLE_FIFO, cap + UART_FCR);
2519         scratch = inb(cap + UART_IIR);
2520 
2521         if (scratch & 0xC0)
2522                 brd->uart_type = PORT_16550A;
2523         else
2524                 brd->uart_type = PORT_16450;
2525         if (!request_region(brd->ports[0].ioaddr, 8 * brd->info->nports,
2526                         "mxser(IO)")) {
2527                 printk(KERN_ERR "mxser: can't request ports I/O region: "
2528                                 "0x%.8lx-0x%.8lx\n",
2529                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2530                                 8 * brd->info->nports - 1);
2531                 return -EIO;
2532         }
2533 
2534         ret = mxser_request_vector(brd);
2535         if (ret) {
2536                 release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2537                 printk(KERN_ERR "mxser: can't request interrupt vector region: "
2538                                 "0x%.8lx-0x%.8lx\n",
2539                                 brd->ports[0].ioaddr, brd->ports[0].ioaddr +
2540                                 8 * brd->info->nports - 1);
2541                 return ret;
2542         }
2543         return brd->info->nports;
2544 
2545 err_irqconflict:
2546         printk(KERN_ERR "mxser: invalid interrupt number\n");
2547         return -EIO;
2548 }
2549 
2550 static int mxser_probe(struct pci_dev *pdev,
2551                 const struct pci_device_id *ent)
2552 {
2553 #ifdef CONFIG_PCI
2554         struct mxser_board *brd;
2555         unsigned int i, j;
2556         unsigned long ioaddress;
2557         struct device *tty_dev;
2558         int retval = -EINVAL;
2559 
2560         for (i = 0; i < MXSER_BOARDS; i++)
2561                 if (mxser_boards[i].info == NULL)
2562                         break;
2563 
2564         if (i >= MXSER_BOARDS) {
2565                 dev_err(&pdev->dev, "too many boards found (maximum %d), board "
2566                                 "not configured\n", MXSER_BOARDS);
2567                 goto err;
2568         }
2569 
2570         brd = &mxser_boards[i];
2571         brd->idx = i * MXSER_PORTS_PER_BOARD;
2572         dev_info(&pdev->dev, "found MOXA %s board (BusNo=%d, DevNo=%d)\n",
2573                 mxser_cards[ent->driver_data].name,
2574                 pdev->bus->number, PCI_SLOT(pdev->devfn));
2575 
2576         retval = pci_enable_device(pdev);
2577         if (retval) {
2578                 dev_err(&pdev->dev, "PCI enable failed\n");
2579                 goto err;
2580         }
2581 
2582         /* io address */
2583         ioaddress = pci_resource_start(pdev, 2);
2584         retval = pci_request_region(pdev, 2, "mxser(IO)");
2585         if (retval)
2586                 goto err_dis;
2587 
2588         brd->info = &mxser_cards[ent->driver_data];
2589         for (i = 0; i < brd->info->nports; i++)
2590                 brd->ports[i].ioaddr = ioaddress + 8 * i;
2591 
2592         /* vector */
2593         ioaddress = pci_resource_start(pdev, 3);
2594         retval = pci_request_region(pdev, 3, "mxser(vector)");
2595         if (retval)
2596                 goto err_zero;
2597         brd->vector = ioaddress;
2598 
2599         /* irq */
2600         brd->irq = pdev->irq;
2601 
2602         brd->chip_flag = CheckIsMoxaMust(brd->ports[0].ioaddr);
2603         brd->uart_type = PORT_16550A;
2604         brd->vector_mask = 0;
2605 
2606         for (i = 0; i < brd->info->nports; i++) {
2607                 for (j = 0; j < UART_INFO_NUM; j++) {
2608                         if (Gpci_uart_info[j].type == brd->chip_flag) {
2609                                 brd->ports[i].max_baud =
2610                                         Gpci_uart_info[j].max_baud;
2611 
2612                                 /* exception....CP-102 */
2613                                 if (brd->info->flags & MXSER_HIGHBAUD)
2614                                         brd->ports[i].max_baud = 921600;
2615                                 break;
2616                         }
2617                 }
2618         }
2619 
2620         if (brd->chip_flag == MOXA_MUST_MU860_HWID) {
2621                 for (i = 0; i < brd->info->nports; i++) {
2622                         if (i < 4)
2623                                 brd->ports[i].opmode_ioaddr = ioaddress + 4;
2624                         else
2625                                 brd->ports[i].opmode_ioaddr = ioaddress + 0x0c;
2626                 }
2627                 outb(0, ioaddress + 4); /* default set to RS232 mode */
2628                 outb(0, ioaddress + 0x0c);      /* default set to RS232 mode */
2629         }
2630 
2631         for (i = 0; i < brd->info->nports; i++) {
2632                 brd->vector_mask |= (1 << i);
2633                 brd->ports[i].baud_base = 921600;
2634         }
2635 
2636         /* mxser_initbrd will hook ISR. */
2637         retval = mxser_initbrd(brd, pdev);
2638         if (retval)
2639                 goto err_rel3;
2640 
2641         for (i = 0; i < brd->info->nports; i++) {
2642                 tty_dev = tty_port_register_device(&brd->ports[i].port,
2643                                 mxvar_sdriver, brd->idx + i, &pdev->dev);
2644                 if (IS_ERR(tty_dev)) {
2645                         retval = PTR_ERR(tty_dev);
2646                         for (; i > 0; i--)
2647                                 tty_unregister_device(mxvar_sdriver,
2648                                         brd->idx + i - 1);
2649                         goto err_relbrd;
2650                 }
2651         }
2652 
2653         pci_set_drvdata(pdev, brd);
2654 
2655         return 0;
2656 err_relbrd:
2657         for (i = 0; i < brd->info->nports; i++)
2658                 tty_port_destroy(&brd->ports[i].port);
2659         free_irq(brd->irq, brd);
2660 err_rel3:
2661         pci_release_region(pdev, 3);
2662 err_zero:
2663         brd->info = NULL;
2664         pci_release_region(pdev, 2);
2665 err_dis:
2666         pci_disable_device(pdev);
2667 err:
2668         return retval;
2669 #else
2670         return -ENODEV;
2671 #endif
2672 }
2673 
2674 static void mxser_remove(struct pci_dev *pdev)
2675 {
2676 #ifdef CONFIG_PCI
2677         struct mxser_board *brd = pci_get_drvdata(pdev);
2678 
2679         mxser_board_remove(brd);
2680 
2681         pci_release_region(pdev, 2);
2682         pci_release_region(pdev, 3);
2683         pci_disable_device(pdev);
2684         brd->info = NULL;
2685 #endif
2686 }
2687 
2688 static struct pci_driver mxser_driver = {
2689         .name = "mxser",
2690         .id_table = mxser_pcibrds,
2691         .probe = mxser_probe,
2692         .remove = mxser_remove
2693 };
2694 
2695 static int __init mxser_module_init(void)
2696 {
2697         struct mxser_board *brd;
2698         struct device *tty_dev;
2699         unsigned int b, i, m;
2700         int retval;
2701 
2702         mxvar_sdriver = alloc_tty_driver(MXSER_PORTS + 1);
2703         if (!mxvar_sdriver)
2704                 return -ENOMEM;
2705 
2706         printk(KERN_INFO "MOXA Smartio/Industio family driver version %s\n",
2707                 MXSER_VERSION);
2708 
2709         /* Initialize the tty_driver structure */
2710         mxvar_sdriver->name = "ttyMI";
2711         mxvar_sdriver->major = ttymajor;
2712         mxvar_sdriver->minor_start = 0;
2713         mxvar_sdriver->type = TTY_DRIVER_TYPE_SERIAL;
2714         mxvar_sdriver->subtype = SERIAL_TYPE_NORMAL;
2715         mxvar_sdriver->init_termios = tty_std_termios;
2716         mxvar_sdriver->init_termios.c_cflag = B9600|CS8|CREAD|HUPCL|CLOCAL;
2717         mxvar_sdriver->flags = TTY_DRIVER_REAL_RAW|TTY_DRIVER_DYNAMIC_DEV;
2718         tty_set_operations(mxvar_sdriver, &mxser_ops);
2719 
2720         retval = tty_register_driver(mxvar_sdriver);
2721         if (retval) {
2722                 printk(KERN_ERR "Couldn't install MOXA Smartio/Industio family "
2723                                 "tty driver !\n");
2724                 goto err_put;
2725         }
2726 
2727         /* Start finding ISA boards here */
2728         for (m = 0, b = 0; b < MXSER_BOARDS; b++) {
2729                 if (!ioaddr[b])
2730                         continue;
2731 
2732                 brd = &mxser_boards[m];
2733                 retval = mxser_get_ISA_conf(ioaddr[b], brd);
2734                 if (retval <= 0) {
2735                         brd->info = NULL;
2736                         continue;
2737                 }
2738 
2739                 printk(KERN_INFO "mxser: found MOXA %s board (CAP=0x%lx)\n",
2740                                 brd->info->name, ioaddr[b]);
2741 
2742                 /* mxser_initbrd will hook ISR. */
2743                 if (mxser_initbrd(brd, NULL) < 0) {
2744                         mxser_release_ISA_res(brd);
2745                         brd->info = NULL;
2746                         continue;
2747                 }
2748 
2749                 brd->idx = m * MXSER_PORTS_PER_BOARD;
2750                 for (i = 0; i < brd->info->nports; i++) {
2751                         tty_dev = tty_port_register_device(&brd->ports[i].port,
2752                                         mxvar_sdriver, brd->idx + i, NULL);
2753                         if (IS_ERR(tty_dev)) {
2754                                 for (; i > 0; i--)
2755                                         tty_unregister_device(mxvar_sdriver,
2756                                                 brd->idx + i - 1);
2757                                 for (i = 0; i < brd->info->nports; i++)
2758                                         tty_port_destroy(&brd->ports[i].port);
2759                                 free_irq(brd->irq, brd);
2760                                 mxser_release_ISA_res(brd);
2761                                 brd->info = NULL;
2762                                 break;
2763                         }
2764                 }
2765                 if (brd->info == NULL)
2766                         continue;
2767 
2768                 m++;
2769         }
2770 
2771         retval = pci_register_driver(&mxser_driver);
2772         if (retval) {
2773                 printk(KERN_ERR "mxser: can't register pci driver\n");
2774                 if (!m) {
2775                         retval = -ENODEV;
2776                         goto err_unr;
2777                 } /* else: we have some ISA cards under control */
2778         }
2779 
2780         return 0;
2781 err_unr:
2782         tty_unregister_driver(mxvar_sdriver);
2783 err_put:
2784         put_tty_driver(mxvar_sdriver);
2785         return retval;
2786 }
2787 
2788 static void __exit mxser_module_exit(void)
2789 {
2790         unsigned int i;
2791 
2792         pci_unregister_driver(&mxser_driver);
2793 
2794         for (i = 0; i < MXSER_BOARDS; i++) /* ISA remains */
2795                 if (mxser_boards[i].info != NULL)
2796                         mxser_board_remove(&mxser_boards[i]);
2797         tty_unregister_driver(mxvar_sdriver);
2798         put_tty_driver(mxvar_sdriver);
2799 
2800         for (i = 0; i < MXSER_BOARDS; i++)
2801                 if (mxser_boards[i].info != NULL)
2802                         mxser_release_ISA_res(&mxser_boards[i]);
2803 }
2804 
2805 module_init(mxser_module_init);
2806 module_exit(mxser_module_exit);
2807 

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