Root/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 */
89static 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
105struct mxser_cardinfo {
106    char *name;
107    unsigned int nports;
108    unsigned int flags;
109};
110
111static 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 */
148static 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};
177MODULE_DEVICE_TABLE(pci, mxser_pcibrds);
178
179static unsigned long ioaddr[MXSER_BOARDS];
180static int ttymajor = MXSERMAJOR;
181
182/* Variables for insmod */
183
184MODULE_AUTHOR("Casper Yang");
185MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
186module_param_array(ioaddr, ulong, NULL, 0);
187MODULE_PARM_DESC(ioaddr, "ISA io addresses to look for a moxa board");
188module_param(ttymajor, int, 0);
189MODULE_LICENSE("GPL");
190
191struct mxser_log {
192    int tick;
193    unsigned long rxcnt[MXSER_PORTS];
194    unsigned long txcnt[MXSER_PORTS];
195};
196
197struct 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
206struct 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
222struct mxser_board;
223
224struct 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
258    struct ktermios normal_termios;
259
260    struct mxser_mon mon_data;
261
262    spinlock_t slock;
263};
264
265struct mxser_board {
266    unsigned int idx;
267    int irq;
268    const struct mxser_cardinfo *info;
269    unsigned long vector;
270    unsigned long vector_mask;
271
272    int chip_flag;
273    int uart_type;
274
275    struct mxser_port ports[MXSER_PORTS_PER_BOARD];
276};
277
278struct mxser_mstatus {
279    tcflag_t cflag;
280    int cts;
281    int dsr;
282    int ri;
283    int dcd;
284};
285
286static struct mxser_board mxser_boards[MXSER_BOARDS];
287static struct tty_driver *mxvar_sdriver;
288static struct mxser_log mxvar_log;
289static int mxser_set_baud_method[MXSER_PORTS + 1];
290
291static void mxser_enable_must_enchance_mode(unsigned long baseio)
292{
293    u8 oldlcr;
294    u8 efr;
295
296    oldlcr = inb(baseio + UART_LCR);
297    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
298
299    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
300    efr |= MOXA_MUST_EFR_EFRB_ENABLE;
301
302    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
303    outb(oldlcr, baseio + UART_LCR);
304}
305
306#ifdef CONFIG_PCI
307static void mxser_disable_must_enchance_mode(unsigned long baseio)
308{
309    u8 oldlcr;
310    u8 efr;
311
312    oldlcr = inb(baseio + UART_LCR);
313    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
314
315    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
316    efr &= ~MOXA_MUST_EFR_EFRB_ENABLE;
317
318    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
319    outb(oldlcr, baseio + UART_LCR);
320}
321#endif
322
323static void mxser_set_must_xon1_value(unsigned long baseio, u8 value)
324{
325    u8 oldlcr;
326    u8 efr;
327
328    oldlcr = inb(baseio + UART_LCR);
329    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
330
331    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
332    efr &= ~MOXA_MUST_EFR_BANK_MASK;
333    efr |= MOXA_MUST_EFR_BANK0;
334
335    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
336    outb(value, baseio + MOXA_MUST_XON1_REGISTER);
337    outb(oldlcr, baseio + UART_LCR);
338}
339
340static void mxser_set_must_xoff1_value(unsigned long baseio, u8 value)
341{
342    u8 oldlcr;
343    u8 efr;
344
345    oldlcr = inb(baseio + UART_LCR);
346    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
347
348    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
349    efr &= ~MOXA_MUST_EFR_BANK_MASK;
350    efr |= MOXA_MUST_EFR_BANK0;
351
352    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
353    outb(value, baseio + MOXA_MUST_XOFF1_REGISTER);
354    outb(oldlcr, baseio + UART_LCR);
355}
356
357static void mxser_set_must_fifo_value(struct mxser_port *info)
358{
359    u8 oldlcr;
360    u8 efr;
361
362    oldlcr = inb(info->ioaddr + UART_LCR);
363    outb(MOXA_MUST_ENTER_ENCHANCE, info->ioaddr + UART_LCR);
364
365    efr = inb(info->ioaddr + MOXA_MUST_EFR_REGISTER);
366    efr &= ~MOXA_MUST_EFR_BANK_MASK;
367    efr |= MOXA_MUST_EFR_BANK1;
368
369    outb(efr, info->ioaddr + MOXA_MUST_EFR_REGISTER);
370    outb((u8)info->rx_high_water, info->ioaddr + MOXA_MUST_RBRTH_REGISTER);
371    outb((u8)info->rx_trigger, info->ioaddr + MOXA_MUST_RBRTI_REGISTER);
372    outb((u8)info->rx_low_water, info->ioaddr + MOXA_MUST_RBRTL_REGISTER);
373    outb(oldlcr, info->ioaddr + UART_LCR);
374}
375
376static void mxser_set_must_enum_value(unsigned long baseio, u8 value)
377{
378    u8 oldlcr;
379    u8 efr;
380
381    oldlcr = inb(baseio + UART_LCR);
382    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
383
384    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
385    efr &= ~MOXA_MUST_EFR_BANK_MASK;
386    efr |= MOXA_MUST_EFR_BANK2;
387
388    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
389    outb(value, baseio + MOXA_MUST_ENUM_REGISTER);
390    outb(oldlcr, baseio + UART_LCR);
391}
392
393#ifdef CONFIG_PCI
394static void mxser_get_must_hardware_id(unsigned long baseio, u8 *pId)
395{
396    u8 oldlcr;
397    u8 efr;
398
399    oldlcr = inb(baseio + UART_LCR);
400    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
401
402    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
403    efr &= ~MOXA_MUST_EFR_BANK_MASK;
404    efr |= MOXA_MUST_EFR_BANK2;
405
406    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
407    *pId = inb(baseio + MOXA_MUST_HWID_REGISTER);
408    outb(oldlcr, baseio + UART_LCR);
409}
410#endif
411
412static void SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(unsigned long baseio)
413{
414    u8 oldlcr;
415    u8 efr;
416
417    oldlcr = inb(baseio + UART_LCR);
418    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
419
420    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
421    efr &= ~MOXA_MUST_EFR_SF_MASK;
422
423    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
424    outb(oldlcr, baseio + UART_LCR);
425}
426
427static void mxser_enable_must_tx_software_flow_control(unsigned long baseio)
428{
429    u8 oldlcr;
430    u8 efr;
431
432    oldlcr = inb(baseio + UART_LCR);
433    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
434
435    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
436    efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
437    efr |= MOXA_MUST_EFR_SF_TX1;
438
439    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
440    outb(oldlcr, baseio + UART_LCR);
441}
442
443static void mxser_disable_must_tx_software_flow_control(unsigned long baseio)
444{
445    u8 oldlcr;
446    u8 efr;
447
448    oldlcr = inb(baseio + UART_LCR);
449    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
450
451    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
452    efr &= ~MOXA_MUST_EFR_SF_TX_MASK;
453
454    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
455    outb(oldlcr, baseio + UART_LCR);
456}
457
458static void mxser_enable_must_rx_software_flow_control(unsigned long baseio)
459{
460    u8 oldlcr;
461    u8 efr;
462
463    oldlcr = inb(baseio + UART_LCR);
464    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
465
466    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
467    efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
468    efr |= MOXA_MUST_EFR_SF_RX1;
469
470    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
471    outb(oldlcr, baseio + UART_LCR);
472}
473
474static void mxser_disable_must_rx_software_flow_control(unsigned long baseio)
475{
476    u8 oldlcr;
477    u8 efr;
478
479    oldlcr = inb(baseio + UART_LCR);
480    outb(MOXA_MUST_ENTER_ENCHANCE, baseio + UART_LCR);
481
482    efr = inb(baseio + MOXA_MUST_EFR_REGISTER);
483    efr &= ~MOXA_MUST_EFR_SF_RX_MASK;
484
485    outb(efr, baseio + MOXA_MUST_EFR_REGISTER);
486    outb(oldlcr, baseio + UART_LCR);
487}
488
489#ifdef CONFIG_PCI
490static int CheckIsMoxaMust(unsigned long io)
491{
492    u8 oldmcr, hwid;
493    int i;
494
495    outb(0, io + UART_LCR);
496    mxser_disable_must_enchance_mode(io);
497    oldmcr = inb(io + UART_MCR);
498    outb(0, io + UART_MCR);
499    mxser_set_must_xon1_value(io, 0x11);
500    if ((hwid = inb(io + UART_MCR)) != 0) {
501        outb(oldmcr, io + UART_MCR);
502        return MOXA_OTHER_UART;
503    }
504
505    mxser_get_must_hardware_id(io, &hwid);
506    for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
507        if (hwid == Gpci_uart_info[i].type)
508            return (int)hwid;
509    }
510    return MOXA_OTHER_UART;
511}
512#endif
513
514static void process_txrx_fifo(struct mxser_port *info)
515{
516    int i;
517
518    if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
519        info->rx_trigger = 1;
520        info->rx_high_water = 1;
521        info->rx_low_water = 1;
522        info->xmit_fifo_size = 1;
523    } else
524        for (i = 0; i < UART_INFO_NUM; i++)
525            if (info->board->chip_flag == Gpci_uart_info[i].type) {
526                info->rx_trigger = Gpci_uart_info[i].rx_trigger;
527                info->rx_low_water = Gpci_uart_info[i].rx_low_water;
528                info->rx_high_water = Gpci_uart_info[i].rx_high_water;
529                info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
530                break;
531            }
532}
533
534static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
535{
536    static unsigned char mxser_msr[MXSER_PORTS + 1];
537    unsigned char status = 0;
538
539    status = inb(baseaddr + UART_MSR);
540
541    mxser_msr[port] &= 0x0F;
542    mxser_msr[port] |= status;
543    status = mxser_msr[port];
544    if (mode)
545        mxser_msr[port] = 0;
546
547    return status;
548}
549
550static int mxser_carrier_raised(struct tty_port *port)
551{
552    struct mxser_port *mp = container_of(port, struct mxser_port, port);
553    return (inb(mp->ioaddr + UART_MSR) & UART_MSR_DCD)?1:0;
554}
555
556static void mxser_dtr_rts(struct tty_port *port, int on)
557{
558    struct mxser_port *mp = container_of(port, struct mxser_port, port);
559    unsigned long flags;
560
561    spin_lock_irqsave(&mp->slock, flags);
562    if (on)
563        outb(inb(mp->ioaddr + UART_MCR) |
564            UART_MCR_DTR | UART_MCR_RTS, mp->ioaddr + UART_MCR);
565    else
566        outb(inb(mp->ioaddr + UART_MCR)&~(UART_MCR_DTR | UART_MCR_RTS),
567            mp->ioaddr + UART_MCR);
568    spin_unlock_irqrestore(&mp->slock, flags);
569}
570
571static int mxser_set_baud(struct tty_struct *tty, long newspd)
572{
573    struct mxser_port *info = tty->driver_data;
574    int quot = 0, baud;
575    unsigned char cval;
576
577    if (!info->ioaddr)
578        return -1;
579
580    if (newspd > info->max_baud)
581        return -1;
582
583    if (newspd == 134) {
584        quot = 2 * info->baud_base / 269;
585        tty_encode_baud_rate(tty, 134, 134);
586    } else if (newspd) {
587        quot = info->baud_base / newspd;
588        if (quot == 0)
589            quot = 1;
590        baud = info->baud_base/quot;
591        tty_encode_baud_rate(tty, baud, baud);
592    } else {
593        quot = 0;
594    }
595
596    info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
597    info->timeout += HZ / 50; /* Add .02 seconds of slop */
598
599    if (quot) {
600        info->MCR |= UART_MCR_DTR;
601        outb(info->MCR, info->ioaddr + UART_MCR);
602    } else {
603        info->MCR &= ~UART_MCR_DTR;
604        outb(info->MCR, info->ioaddr + UART_MCR);
605        return 0;
606    }
607
608    cval = inb(info->ioaddr + UART_LCR);
609
610    outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR); /* set DLAB */
611
612    outb(quot & 0xff, info->ioaddr + UART_DLL); /* LS of divisor */
613    outb(quot >> 8, info->ioaddr + UART_DLM); /* MS of divisor */
614    outb(cval, info->ioaddr + UART_LCR); /* reset DLAB */
615
616#ifdef BOTHER
617    if (C_BAUD(tty) == BOTHER) {
618        quot = info->baud_base % newspd;
619        quot *= 8;
620        if (quot % newspd > newspd / 2) {
621            quot /= newspd;
622            quot++;
623        } else
624            quot /= newspd;
625
626        mxser_set_must_enum_value(info->ioaddr, quot);
627    } else
628#endif
629        mxser_set_must_enum_value(info->ioaddr, 0);
630
631    return 0;
632}
633
634/*
635 * This routine is called to set the UART divisor registers to match
636 * the specified baud rate for a serial port.
637 */
638static int mxser_change_speed(struct tty_struct *tty,
639                    struct ktermios *old_termios)
640{
641    struct mxser_port *info = tty->driver_data;
642    unsigned cflag, cval, fcr;
643    int ret = 0;
644    unsigned char status;
645
646    cflag = tty->termios.c_cflag;
647    if (!info->ioaddr)
648        return ret;
649
650    if (mxser_set_baud_method[tty->index] == 0)
651        mxser_set_baud(tty, tty_get_baud_rate(tty));
652
653    /* byte size and parity */
654    switch (cflag & CSIZE) {
655    case CS5:
656        cval = 0x00;
657        break;
658    case CS6:
659        cval = 0x01;
660        break;
661    case CS7:
662        cval = 0x02;
663        break;
664    case CS8:
665        cval = 0x03;
666        break;
667    default:
668        cval = 0x00;
669        break; /* too keep GCC shut... */
670    }
671    if (cflag & CSTOPB)
672        cval |= 0x04;
673    if (cflag & PARENB)
674        cval |= UART_LCR_PARITY;
675    if (!(cflag & PARODD))
676        cval |= UART_LCR_EPAR;
677    if (cflag & CMSPAR)
678        cval |= UART_LCR_SPAR;
679
680    if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
681        if (info->board->chip_flag) {
682            fcr = UART_FCR_ENABLE_FIFO;
683            fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
684            mxser_set_must_fifo_value(info);
685        } else
686            fcr = 0;
687    } else {
688        fcr = UART_FCR_ENABLE_FIFO;
689        if (info->board->chip_flag) {
690            fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
691            mxser_set_must_fifo_value(info);
692        } else {
693            switch (info->rx_trigger) {
694            case 1:
695                fcr |= UART_FCR_TRIGGER_1;
696                break;
697            case 4:
698                fcr |= UART_FCR_TRIGGER_4;
699                break;
700            case 8:
701                fcr |= UART_FCR_TRIGGER_8;
702                break;
703            default:
704                fcr |= UART_FCR_TRIGGER_14;
705                break;
706            }
707        }
708    }
709
710    /* CTS flow control flag and modem status interrupts */
711    info->IER &= ~UART_IER_MSI;
712    info->MCR &= ~UART_MCR_AFE;
713    if (cflag & CRTSCTS) {
714        info->port.flags |= ASYNC_CTS_FLOW;
715        info->IER |= UART_IER_MSI;
716        if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
717            info->MCR |= UART_MCR_AFE;
718        } else {
719            status = inb(info->ioaddr + UART_MSR);
720            if (tty->hw_stopped) {
721                if (status & UART_MSR_CTS) {
722                    tty->hw_stopped = 0;
723                    if (info->type != PORT_16550A &&
724                            !info->board->chip_flag) {
725                        outb(info->IER & ~UART_IER_THRI,
726                            info->ioaddr +
727                            UART_IER);
728                        info->IER |= UART_IER_THRI;
729                        outb(info->IER, info->ioaddr +
730                                UART_IER);
731                    }
732                    tty_wakeup(tty);
733                }
734            } else {
735                if (!(status & UART_MSR_CTS)) {
736                    tty->hw_stopped = 1;
737                    if ((info->type != PORT_16550A) &&
738                            (!info->board->chip_flag)) {
739                        info->IER &= ~UART_IER_THRI;
740                        outb(info->IER, info->ioaddr +
741                                UART_IER);
742                    }
743                }
744            }
745        }
746    } else {
747        info->port.flags &= ~ASYNC_CTS_FLOW;
748    }
749    outb(info->MCR, info->ioaddr + UART_MCR);
750    if (cflag & CLOCAL) {
751        info->port.flags &= ~ASYNC_CHECK_CD;
752    } else {
753        info->port.flags |= ASYNC_CHECK_CD;
754        info->IER |= UART_IER_MSI;
755    }
756    outb(info->IER, info->ioaddr + UART_IER);
757
758    /*
759     * Set up parity check flag
760     */
761    info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
762    if (I_INPCK(tty))
763        info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
764    if (I_BRKINT(tty) || I_PARMRK(tty))
765        info->read_status_mask |= UART_LSR_BI;
766
767    info->ignore_status_mask = 0;
768
769    if (I_IGNBRK(tty)) {
770        info->ignore_status_mask |= UART_LSR_BI;
771        info->read_status_mask |= UART_LSR_BI;
772        /*
773         * If we're ignore parity and break indicators, ignore
774         * overruns too. (For real raw support).
775         */
776        if (I_IGNPAR(tty)) {
777            info->ignore_status_mask |=
778                        UART_LSR_OE |
779                        UART_LSR_PE |
780                        UART_LSR_FE;
781            info->read_status_mask |=
782                        UART_LSR_OE |
783                        UART_LSR_PE |
784                        UART_LSR_FE;
785        }
786    }
787    if (info->board->chip_flag) {
788        mxser_set_must_xon1_value(info->ioaddr, START_CHAR(tty));
789        mxser_set_must_xoff1_value(info->ioaddr, STOP_CHAR(tty));
790        if (I_IXON(tty)) {
791            mxser_enable_must_rx_software_flow_control(
792                    info->ioaddr);
793        } else {
794            mxser_disable_must_rx_software_flow_control(
795                    info->ioaddr);
796        }
797        if (I_IXOFF(tty)) {
798            mxser_enable_must_tx_software_flow_control(
799                    info->ioaddr);
800        } else {
801            mxser_disable_must_tx_software_flow_control(
802                    info->ioaddr);
803        }
804    }
805
806
807    outb(fcr, info->ioaddr + UART_FCR); /* set fcr */
808    outb(cval, info->ioaddr + UART_LCR);
809
810    return ret;
811}
812
813static void mxser_check_modem_status(struct tty_struct *tty,
814                struct mxser_port *port, int status)
815{
816    /* update input line counters */
817    if (status & UART_MSR_TERI)
818        port->icount.rng++;
819    if (status & UART_MSR_DDSR)
820        port->icount.dsr++;
821    if (status & UART_MSR_DDCD)
822        port->icount.dcd++;
823    if (status & UART_MSR_DCTS)
824        port->icount.cts++;
825    port->mon_data.modem_status = status;
826    wake_up_interruptible(&port->port.delta_msr_wait);
827
828    if ((port->port.flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
829        if (status & UART_MSR_DCD)
830            wake_up_interruptible(&port->port.open_wait);
831    }
832
833    if (tty_port_cts_enabled(&port->port)) {
834        if (tty->hw_stopped) {
835            if (status & UART_MSR_CTS) {
836                tty->hw_stopped = 0;
837
838                if ((port->type != PORT_16550A) &&
839                        (!port->board->chip_flag)) {
840                    outb(port->IER & ~UART_IER_THRI,
841                        port->ioaddr + UART_IER);
842                    port->IER |= UART_IER_THRI;
843                    outb(port->IER, port->ioaddr +
844                            UART_IER);
845                }
846                tty_wakeup(tty);
847            }
848        } else {
849            if (!(status & UART_MSR_CTS)) {
850                tty->hw_stopped = 1;
851                if (port->type != PORT_16550A &&
852                        !port->board->chip_flag) {
853                    port->IER &= ~UART_IER_THRI;
854                    outb(port->IER, port->ioaddr +
855                            UART_IER);
856                }
857            }
858        }
859    }
860}
861
862static int mxser_activate(struct tty_port *port, struct tty_struct *tty)
863{
864    struct mxser_port *info = container_of(port, struct mxser_port, port);
865    unsigned long page;
866    unsigned long flags;
867
868    page = __get_free_page(GFP_KERNEL);
869    if (!page)
870        return -ENOMEM;
871
872    spin_lock_irqsave(&info->slock, flags);
873
874    if (!info->ioaddr || !info->type) {
875        set_bit(TTY_IO_ERROR, &tty->flags);
876        free_page(page);
877        spin_unlock_irqrestore(&info->slock, flags);
878        return 0;
879    }
880    info->port.xmit_buf = (unsigned char *) page;
881
882    /*
883     * Clear the FIFO buffers and disable them
884     * (they will be reenabled in mxser_change_speed())
885     */
886    if (info->board->chip_flag)
887        outb((UART_FCR_CLEAR_RCVR |
888            UART_FCR_CLEAR_XMIT |
889            MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
890    else
891        outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
892            info->ioaddr + UART_FCR);
893
894    /*
895     * At this point there's no way the LSR could still be 0xFF;
896     * if it is, then bail out, because there's likely no UART
897     * here.
898     */
899    if (inb(info->ioaddr + UART_LSR) == 0xff) {
900        spin_unlock_irqrestore(&info->slock, flags);
901        if (capable(CAP_SYS_ADMIN)) {
902            set_bit(TTY_IO_ERROR, &tty->flags);
903            return 0;
904        } else
905            return -ENODEV;
906    }
907
908    /*
909     * Clear the interrupt registers.
910     */
911    (void) inb(info->ioaddr + UART_LSR);
912    (void) inb(info->ioaddr + UART_RX);
913    (void) inb(info->ioaddr + UART_IIR);
914    (void) inb(info->ioaddr + UART_MSR);
915
916    /*
917     * Now, initialize the UART
918     */
919    outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR); /* reset DLAB */
920    info->MCR = UART_MCR_DTR | UART_MCR_RTS;
921    outb(info->MCR, info->ioaddr + UART_MCR);
922
923    /*
924     * Finally, enable interrupts
925     */
926    info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;
927
928    if (info->board->chip_flag)
929        info->IER |= MOXA_MUST_IER_EGDAI;
930    outb(info->IER, info->ioaddr + UART_IER); /* enable interrupts */
931
932    /*
933     * And clear the interrupt registers again for luck.
934     */
935    (void) inb(info->ioaddr + UART_LSR);
936    (void) inb(info->ioaddr + UART_RX);
937    (void) inb(info->ioaddr + UART_IIR);
938    (void) inb(info->ioaddr + UART_MSR);
939
940    clear_bit(TTY_IO_ERROR, &tty->flags);
941    info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
942
943    /*
944     * and set the speed of the serial port
945     */
946    mxser_change_speed(tty, NULL);
947    spin_unlock_irqrestore(&info->slock, flags);
948
949    return 0;
950}
951
952/*
953 * This routine will shutdown a serial port
954 */
955static void mxser_shutdown_port(struct tty_port *port)
956{
957    struct mxser_port *info = container_of(port, struct mxser_port, port);
958    unsigned long flags;
959
960    spin_lock_irqsave(&info->slock, flags);
961
962    /*
963     * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
964     * here so the queue might never be waken up
965     */
966    wake_up_interruptible(&info->port.delta_msr_wait);
967
968    /*
969     * Free the xmit buffer, if necessary
970     */
971    if (info->port.xmit_buf) {
972        free_page((unsigned long) info->port.xmit_buf);
973        info->port.xmit_buf = NULL;
974    }
975
976    info->IER = 0;
977    outb(0x00, info->ioaddr + UART_IER);
978
979    /* clear Rx/Tx FIFO's */
980    if (info->board->chip_flag)
981        outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
982                MOXA_MUST_FCR_GDA_MODE_ENABLE,
983                info->ioaddr + UART_FCR);
984    else
985        outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
986            info->ioaddr + UART_FCR);
987
988    /* read data port to reset things */
989    (void) inb(info->ioaddr + UART_RX);
990
991
992    if (info->board->chip_flag)
993        SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);
994
995    spin_unlock_irqrestore(&info->slock, flags);
996}
997
998/*
999 * This routine is called whenever a serial port is opened. It
1000 * enables interrupts for a serial port, linking in its async structure into
1001 * the IRQ chain. It also performs the serial-specific
1002 * initialization for the tty structure.
1003 */
1004static int mxser_open(struct tty_struct *tty, struct file *filp)
1005{
1006    struct mxser_port *info;
1007    int line;
1008
1009    line = tty->index;
1010    if (line == MXSER_PORTS)
1011        return 0;
1012    info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
1013    if (!info->ioaddr)
1014        return -ENODEV;
1015
1016    tty->driver_data = info;
1017    return tty_port_open(&info->port, tty, filp);
1018}
1019
1020static void mxser_flush_buffer(struct tty_struct *tty)
1021{
1022    struct mxser_port *info = tty->driver_data;
1023    char fcr;
1024    unsigned long flags;
1025
1026
1027    spin_lock_irqsave(&info->slock, flags);
1028    info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1029
1030    fcr = inb(info->ioaddr + UART_FCR);
1031    outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1032        info->ioaddr + UART_FCR);
1033    outb(fcr, info->ioaddr + UART_FCR);
1034
1035    spin_unlock_irqrestore(&info->slock, flags);
1036
1037    tty_wakeup(tty);
1038}
1039
1040
1041static void mxser_close_port(struct tty_port *port)
1042{
1043    struct mxser_port *info = container_of(port, struct mxser_port, port);
1044    unsigned long timeout;
1045    /*
1046     * At this point we stop accepting input. To do this, we
1047     * disable the receive line status interrupts, and tell the
1048     * interrupt driver to stop checking the data ready bit in the
1049     * line status register.
1050     */
1051    info->IER &= ~UART_IER_RLSI;
1052    if (info->board->chip_flag)
1053        info->IER &= ~MOXA_MUST_RECV_ISR;
1054
1055    outb(info->IER, info->ioaddr + UART_IER);
1056    /*
1057     * Before we drop DTR, make sure the UART transmitter
1058     * has completely drained; this is especially
1059     * important if there is a transmit FIFO!
1060     */
1061    timeout = jiffies + HZ;
1062    while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1063        schedule_timeout_interruptible(5);
1064        if (time_after(jiffies, timeout))
1065            break;
1066    }
1067}
1068
1069/*
1070 * This routine is called when the serial port gets closed. First, we
1071 * wait for the last remaining data to be sent. Then, we unlink its
1072 * async structure from the interrupt chain if necessary, and we free
1073 * that IRQ if nothing is left in the chain.
1074 */
1075static void mxser_close(struct tty_struct *tty, struct file *filp)
1076{
1077    struct mxser_port *info = tty->driver_data;
1078    struct tty_port *port = &info->port;
1079
1080    if (tty->index == MXSER_PORTS || info == NULL)
1081        return;
1082    if (tty_port_close_start(port, tty, filp) == 0)
1083        return;
1084    mutex_lock(&port->mutex);
1085    mxser_close_port(port);
1086    mxser_flush_buffer(tty);
1087    mxser_shutdown_port(port);
1088    clear_bit(ASYNCB_INITIALIZED, &port->flags);
1089    mutex_unlock(&port->mutex);
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
1096static 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
1138static 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
1169static 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
1188static 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
1197static 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 */
1208static 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        .hub6 = 0
1223    };
1224    if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1225        return -EFAULT;
1226    return 0;
1227}
1228
1229static int mxser_set_serial_info(struct tty_struct *tty,
1230        struct serial_struct __user *new_info)
1231{
1232    struct mxser_port *info = tty->driver_data;
1233    struct tty_port *port = &info->port;
1234    struct serial_struct new_serial;
1235    speed_t baud;
1236    unsigned long sl_flags;
1237    unsigned int flags;
1238    int retval = 0;
1239
1240    if (!new_info || !info->ioaddr)
1241        return -ENODEV;
1242    if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1243        return -EFAULT;
1244
1245    if (new_serial.irq != info->board->irq ||
1246            new_serial.port != info->ioaddr)
1247        return -EINVAL;
1248
1249    flags = port->flags & ASYNC_SPD_MASK;
1250
1251    if (!capable(CAP_SYS_ADMIN)) {
1252        if ((new_serial.baud_base != info->baud_base) ||
1253                (new_serial.close_delay != info->port.close_delay) ||
1254                ((new_serial.flags & ~ASYNC_USR_MASK) != (info->port.flags & ~ASYNC_USR_MASK)))
1255            return -EPERM;
1256        info->port.flags = ((info->port.flags & ~ASYNC_USR_MASK) |
1257                (new_serial.flags & ASYNC_USR_MASK));
1258    } else {
1259        /*
1260         * OK, past this point, all the error checking has been done.
1261         * At this point, we start making changes.....
1262         */
1263        port->flags = ((port->flags & ~ASYNC_FLAGS) |
1264                (new_serial.flags & ASYNC_FLAGS));
1265        port->close_delay = new_serial.close_delay * HZ / 100;
1266        port->closing_wait = new_serial.closing_wait * HZ / 100;
1267        port->low_latency = (port->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1268        if ((port->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST &&
1269                (new_serial.baud_base != info->baud_base ||
1270                new_serial.custom_divisor !=
1271                info->custom_divisor)) {
1272            if (new_serial.custom_divisor == 0)
1273                return -EINVAL;
1274            baud = new_serial.baud_base / new_serial.custom_divisor;
1275            tty_encode_baud_rate(tty, baud, baud);
1276        }
1277    }
1278
1279    info->type = new_serial.type;
1280
1281    process_txrx_fifo(info);
1282
1283    if (test_bit(ASYNCB_INITIALIZED, &port->flags)) {
1284        if (flags != (port->flags & ASYNC_SPD_MASK)) {
1285            spin_lock_irqsave(&info->slock, sl_flags);
1286            mxser_change_speed(tty, NULL);
1287            spin_unlock_irqrestore(&info->slock, sl_flags);
1288        }
1289    } else {
1290        retval = mxser_activate(port, tty);
1291        if (retval == 0)
1292            set_bit(ASYNCB_INITIALIZED, &port->flags);
1293    }
1294    return retval;
1295}
1296
1297/*
1298 * mxser_get_lsr_info - get line status register info
1299 *
1300 * Purpose: Let user call ioctl() to get info when the UART physically
1301 * is emptied. On bus types like RS485, the transmitter must
1302 * release the bus after transmitting. This must be done when
1303 * the transmit shift register is empty, not be done when the
1304 * transmit holding register is empty. This functionality
1305 * allows an RS485 driver to be written in user space.
1306 */
1307static int mxser_get_lsr_info(struct mxser_port *info,
1308        unsigned int __user *value)
1309{
1310    unsigned char status;
1311    unsigned int result;
1312    unsigned long flags;
1313
1314    spin_lock_irqsave(&info->slock, flags);
1315    status = inb(info->ioaddr + UART_LSR);
1316    spin_unlock_irqrestore(&info->slock, flags);
1317    result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
1318    return put_user(result, value);
1319}
1320
1321static int mxser_tiocmget(struct tty_struct *tty)
1322{
1323    struct mxser_port *info = tty->driver_data;
1324    unsigned char control, status;
1325    unsigned long flags;
1326
1327
1328    if (tty->index == MXSER_PORTS)
1329        return -ENOIOCTLCMD;
1330    if (test_bit(TTY_IO_ERROR, &tty->flags))
1331        return -EIO;
1332
1333    control = info->MCR;
1334
1335    spin_lock_irqsave(&info->slock, flags);
1336    status = inb(info->ioaddr + UART_MSR);
1337    if (status & UART_MSR_ANY_DELTA)
1338        mxser_check_modem_status(tty, info, status);
1339    spin_unlock_irqrestore(&info->slock, flags);
1340    return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
1341            ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
1342            ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
1343            ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
1344            ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
1345            ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
1346}
1347
1348static int mxser_tiocmset(struct tty_struct *tty,
1349        unsigned int set, unsigned int clear)
1350{
1351    struct mxser_port *info = tty->driver_data;
1352    unsigned long flags;
1353
1354
1355    if (tty->index == MXSER_PORTS)
1356        return -ENOIOCTLCMD;
1357    if (test_bit(TTY_IO_ERROR, &tty->flags))
1358        return -EIO;
1359
1360    spin_lock_irqsave(&info->slock, flags);
1361
1362    if (set & TIOCM_RTS)
1363        info->MCR |= UART_MCR_RTS;
1364    if (set & TIOCM_DTR)
1365        info->MCR |= UART_MCR_DTR;
1366
1367    if (clear & TIOCM_RTS)
1368        info->MCR &= ~UART_MCR_RTS;
1369    if (clear & TIOCM_DTR)
1370        info->MCR &= ~UART_MCR_DTR;
1371
1372    outb(info->MCR, info->ioaddr + UART_MCR);
1373    spin_unlock_irqrestore(&info->slock, flags);
1374    return 0;
1375}
1376
1377static int __init mxser_program_mode(int port)
1378{
1379    int id, i, j, n;
1380
1381    outb(0, port);
1382    outb(0, port);
1383    outb(0, port);
1384    (void)inb(port);
1385    (void)inb(port);
1386    outb(0, port);
1387    (void)inb(port);
1388
1389    id = inb(port + 1) & 0x1F;
1390    if ((id != C168_ASIC_ID) &&
1391            (id != C104_ASIC_ID) &&
1392            (id != C102_ASIC_ID) &&
1393            (id != CI132_ASIC_ID) &&
1394            (id != CI134_ASIC_ID) &&
1395            (id != CI104J_ASIC_ID))
1396        return -1;
1397    for (i = 0, j = 0; i < 4; i++) {
1398        n = inb(port + 2);
1399        if (n == 'M') {
1400            j = 1;
1401        } else if ((j == 1) && (n == 1)) {
1402            j = 2;
1403            break;
1404        } else
1405            j = 0;
1406    }
1407    if (j != 2)
1408        id = -2;
1409    return id;
1410}
1411
1412static void __init mxser_normal_mode(int port)
1413{
1414    int i, n;
1415
1416    outb(0xA5, port + 1);
1417    outb(0x80, port + 3);
1418    outb(12, port + 0); /* 9600 bps */
1419    outb(0, port + 1);
1420    outb(0x03, port + 3); /* 8 data bits */
1421    outb(0x13, port + 4); /* loop back mode */
1422    for (i = 0; i < 16; i++) {
1423        n = inb(port + 5);
1424        if ((n & 0x61) == 0x60)
1425            break;
1426        if ((n & 1) == 1)
1427            (void)inb(port);
1428    }
1429    outb(0x00, port + 4);
1430}
1431
1432#define CHIP_SK 0x01 /* Serial Data Clock in Eprom */
1433#define CHIP_DO 0x02 /* Serial Data Output in Eprom */
1434#define CHIP_CS 0x04 /* Serial Chip Select in Eprom */
1435#define CHIP_DI 0x08 /* Serial Data Input in Eprom */
1436#define EN_CCMD 0x000 /* Chip's command register */
1437#define EN0_RSARLO 0x008 /* Remote start address reg 0 */
1438#define EN0_RSARHI 0x009 /* Remote start address reg 1 */
1439#define EN0_RCNTLO 0x00A /* Remote byte count reg WR */
1440#define EN0_RCNTHI 0x00B /* Remote byte count reg WR */
1441#define EN0_DCFG 0x00E /* Data configuration reg WR */
1442#define EN0_PORT 0x010 /* Rcv missed frame error counter RD */
1443#define ENC_PAGE0 0x000 /* Select page 0 of chip registers */
1444#define ENC_PAGE3 0x0C0 /* Select page 3 of chip registers */
1445static int __init mxser_read_register(int port, unsigned short *regs)
1446{
1447    int i, k, value, id;
1448    unsigned int j;
1449
1450    id = mxser_program_mode(port);
1451    if (id < 0)
1452        return id;
1453    for (i = 0; i < 14; i++) {
1454        k = (i & 0x3F) | 0x180;
1455        for (j = 0x100; j > 0; j >>= 1) {
1456            outb(CHIP_CS, port);
1457            if (k & j) {
1458                outb(CHIP_CS | CHIP_DO, port);
1459                outb(CHIP_CS | CHIP_DO | CHIP_SK, port); /* A? bit of read */
1460            } else {
1461                outb(CHIP_CS, port);
1462                outb(CHIP_CS | CHIP_SK, port); /* A? bit of read */
1463            }
1464        }
1465        (void)inb(port);
1466        value = 0;
1467        for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
1468            outb(CHIP_CS, port);
1469            outb(CHIP_CS | CHIP_SK, port);
1470            if (inb(port) & CHIP_DI)
1471                value |= j;
1472        }
1473        regs[i] = value;
1474        outb(0, port);
1475    }
1476    mxser_normal_mode(port);
1477    return id;
1478}
1479
1480static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
1481{
1482    struct mxser_port *ip;
1483    struct tty_port *port;
1484    struct tty_struct *tty;
1485    int result, status;
1486    unsigned int i, j;
1487    int ret = 0;
1488
1489    switch (cmd) {
1490    case MOXA_GET_MAJOR:
1491        printk_ratelimited(KERN_WARNING "mxser: '%s' uses deprecated ioctl "
1492                    "%x (GET_MAJOR), fix your userspace\n",
1493                    current->comm, cmd);
1494        return put_user(ttymajor, (int __user *)argp);
1495
1496    case MOXA_CHKPORTENABLE:
1497        result = 0;
1498        for (i = 0; i < MXSER_BOARDS; i++)
1499            for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
1500                if (mxser_boards[i].ports[j].ioaddr)
1501                    result |= (1 << i);
1502        return put_user(result, (unsigned long __user *)argp);
1503    case MOXA_GETDATACOUNT:
1504        /* The receive side is locked by port->slock but it isn't
1505           clear that an exact snapshot is worth copying here */
1506        if (copy_to_user(argp, &mxvar_log, sizeof(mxvar_log)))
1507            ret = -EFAULT;
1508        return ret;
1509    case MOXA_GETMSTATUS: {
1510        struct mxser_mstatus ms, __user *msu = argp;
1511        for (i = 0; i < MXSER_BOARDS; i++)
1512            for (j = 0; j < MXSER_PORTS_PER_BOARD; j++) {
1513                ip = &mxser_boards[i].ports[j];
1514                port = &ip->port;
1515                memset(&ms, 0, sizeof(ms));
1516
1517                mutex_lock(&port->mutex);
1518                if (!ip->ioaddr)
1519                    goto copy;
1520                
1521                tty = tty_port_tty_get(port);
1522
1523                if (!tty)
1524                    ms.cflag = ip->normal_termios.c_cflag;
1525                else
1526                    ms.cflag = tty->termios.c_cflag;
1527                tty_kref_put(tty);
1528                spin_lock_irq(&ip->slock);
1529                status = inb(ip->ioaddr + UART_MSR);
1530                spin_unlock_irq(&ip->slock);
1531                if (status & UART_MSR_DCD)
1532                    ms.dcd = 1;
1533                if (status & UART_MSR_DSR)
1534                    ms.dsr = 1;
1535                if (status & UART_MSR_CTS)
1536                    ms.cts = 1;
1537            copy:
1538                mutex_unlock(&port->mutex);
1539                if (copy_to_user(msu, &ms, sizeof(ms)))
1540                    return -EFAULT;
1541                msu++;
1542            }
1543        return 0;
1544    }
1545    case MOXA_ASPP_MON_EXT: {
1546        struct mxser_mon_ext *me; /* it's 2k, stack unfriendly */
1547        unsigned int cflag, iflag, p;
1548        u8 opmode;
1549
1550        me = kzalloc(sizeof(*me), GFP_KERNEL);
1551        if (!me)
1552            return -ENOMEM;
1553
1554        for (i = 0, p = 0; i < MXSER_BOARDS; i++) {
1555            for (j = 0; j < MXSER_PORTS_PER_BOARD; j++, p++) {
1556                if (p >= ARRAY_SIZE(me->rx_cnt)) {
1557                    i = MXSER_BOARDS;
1558                    break;
1559                }
1560                ip = &mxser_boards[i].ports[j];
1561                port = &ip->port;
1562
1563                mutex_lock(&port->mutex);
1564                if (!ip->ioaddr) {
1565                    mutex_unlock(&port->mutex);
1566                    continue;
1567                }
1568
1569                spin_lock_irq(&ip->slock);
1570                status = mxser_get_msr(ip->ioaddr, 0, p);
1571
1572                if (status & UART_MSR_TERI)
1573                    ip->icount.rng++;
1574                if (status & UART_MSR_DDSR)
1575                    ip->icount.dsr++;
1576                if (status & UART_MSR_DDCD)
1577                    ip->icount.dcd++;
1578                if (status & UART_MSR_DCTS)
1579                    ip->icount.cts++;
1580
1581                ip->mon_data.modem_status = status;
1582                me->rx_cnt[p] = ip->mon_data.rxcnt;
1583                me->tx_cnt[p] = ip->mon_data.txcnt;
1584                me->up_rxcnt[p] = ip->mon_data.up_rxcnt;
1585                me->up_txcnt[p] = ip->mon_data.up_txcnt;
1586                me->modem_status[p] =
1587                    ip->mon_data.modem_status;
1588                spin_unlock_irq(&ip->slock);
1589
1590                tty = tty_port_tty_get(&ip->port);
1591
1592                if (!tty) {
1593                    cflag = ip->normal_termios.c_cflag;
1594                    iflag = ip->normal_termios.c_iflag;
1595                    me->baudrate[p] = tty_termios_baud_rate(&ip->normal_termios);
1596                } else {
1597                    cflag = tty->termios.c_cflag;
1598                    iflag = tty->termios.c_iflag;
1599                    me->baudrate[p] = tty_get_baud_rate(tty);
1600                }
1601                tty_kref_put(tty);
1602
1603                me->databits[p] = cflag & CSIZE;
1604                me->stopbits[p] = cflag & CSTOPB;
1605                me->parity[p] = cflag & (PARENB | PARODD |
1606                        CMSPAR);
1607
1608                if (cflag & CRTSCTS)
1609                    me->flowctrl[p] |= 0x03;
1610
1611                if (iflag & (IXON | IXOFF))
1612                    me->flowctrl[p] |= 0x0C;
1613
1614                if (ip->type == PORT_16550A)
1615                    me->fifo[p] = 1;
1616
1617                opmode = inb(ip->opmode_ioaddr)>>((p % 4) * 2);
1618                opmode &= OP_MODE_MASK;
1619                me->iftype[p] = opmode;
1620                mutex_unlock(&port->mutex);
1621            }
1622        }
1623        if (copy_to_user(argp, me, sizeof(*me)))
1624            ret = -EFAULT;
1625        kfree(me);
1626        return ret;
1627    }
1628    default:
1629        return -ENOIOCTLCMD;
1630    }
1631    return 0;
1632}
1633
1634static int mxser_cflags_changed(struct mxser_port *info, unsigned long arg,
1635        struct async_icount *cprev)
1636{
1637    struct async_icount cnow;
1638    unsigned long flags;
1639    int ret;
1640
1641    spin_lock_irqsave(&info->slock, flags);
1642    cnow = info->icount; /* atomic copy */
1643    spin_unlock_irqrestore(&info->slock, flags);
1644
1645    ret = ((arg & TIOCM_RNG) && (cnow.rng != cprev->rng)) ||
1646        ((arg & TIOCM_DSR) && (cnow.dsr != cprev->dsr)) ||
1647        ((arg & TIOCM_CD) && (cnow.dcd != cprev->dcd)) ||
1648        ((arg & TIOCM_CTS) && (cnow.cts != cprev->cts));
1649
1650    *cprev = cnow;
1651
1652    return ret;
1653}
1654
1655static int mxser_ioctl(struct tty_struct *tty,
1656        unsigned int cmd, unsigned long arg)
1657{
1658    struct mxser_port *info = tty->driver_data;
1659    struct tty_port *port = &info->port;
1660    struct async_icount cnow;
1661    unsigned long flags;
1662    void __user *argp = (void __user *)arg;
1663    int retval;
1664
1665    if (tty->index == MXSER_PORTS)
1666        return mxser_ioctl_special(cmd, argp);
1667
1668    if (cmd == MOXA_SET_OP_MODE || cmd == MOXA_GET_OP_MODE) {
1669        int p;
1670        unsigned long opmode;
1671        static unsigned char ModeMask[] = { 0xfc, 0xf3, 0xcf, 0x3f };
1672        int shiftbit;
1673        unsigned char val, mask;
1674
1675        p = tty->index % 4;
1676        if (cmd == MOXA_SET_OP_MODE) {
1677            if (get_user(opmode, (int __user *) argp))
1678                return -EFAULT;
1679            if (opmode != RS232_MODE &&
1680                    opmode != RS485_2WIRE_MODE &&
1681                    opmode != RS422_MODE &&
1682                    opmode != RS485_4WIRE_MODE)
1683                return -EFAULT;
1684            mask = ModeMask[p];
1685            shiftbit = p * 2;
1686            spin_lock_irq(&info->slock);
1687            val = inb(info->opmode_ioaddr);
1688            val &= mask;
1689            val |= (opmode << shiftbit);
1690            outb(val, info->opmode_ioaddr);
1691            spin_unlock_irq(&info->slock);
1692        } else {
1693            shiftbit = p * 2;
1694            spin_lock_irq(&info->slock);
1695            opmode = inb(info->opmode_ioaddr) >> shiftbit;
1696            spin_unlock_irq(&info->slock);
1697            opmode &= OP_MODE_MASK;
1698            if (put_user(opmode, (int __user *)argp))
1699                return -EFAULT;
1700        }
1701        return 0;
1702    }
1703
1704    if (cmd != TIOCGSERIAL && cmd != TIOCMIWAIT &&
1705            test_bit(TTY_IO_ERROR, &tty->flags))
1706        return -EIO;
1707
1708    switch (cmd) {
1709    case TIOCGSERIAL:
1710        mutex_lock(&port->mutex);
1711        retval = mxser_get_serial_info(tty, argp);
1712        mutex_unlock(&port->mutex);
1713        return retval;
1714    case TIOCSSERIAL:
1715        mutex_lock(&port->mutex);
1716        retval = mxser_set_serial_info(tty, argp);
1717        mutex_unlock(&port->mutex);
1718        return retval;
1719    case TIOCSERGETLSR: /* Get line status register */
1720        return mxser_get_lsr_info(info, argp);
1721        /*
1722         * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1723         * - mask passed in arg for lines of interest
1724         * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1725         * Caller should use TIOCGICOUNT to see which one it was
1726         */
1727    case TIOCMIWAIT:
1728        spin_lock_irqsave(&info->slock, flags);
1729        cnow = info->icount; /* note the counters on entry */
1730        spin_unlock_irqrestore(&info->slock, flags);
1731
1732        return wait_event_interruptible(info->port.delta_msr_wait,
1733                mxser_cflags_changed(info, arg, &cnow));
1734    case MOXA_HighSpeedOn:
1735        return put_user(info->baud_base != 115200 ? 1 : 0, (int __user *)argp);
1736    case MOXA_SDS_RSTICOUNTER:
1737        spin_lock_irq(&info->slock);
1738        info->mon_data.rxcnt = 0;
1739        info->mon_data.txcnt = 0;
1740        spin_unlock_irq(&info->slock);
1741        return 0;
1742
1743    case MOXA_ASPP_OQUEUE:{
1744        int len, lsr;
1745
1746        len = mxser_chars_in_buffer(tty);
1747        spin_lock_irq(&info->slock);
1748        lsr = inb(info->ioaddr + UART_LSR) & UART_LSR_THRE;
1749        spin_unlock_irq(&info->slock);
1750        len += (lsr ? 0 : 1);
1751
1752        return put_user(len, (int __user *)argp);
1753    }
1754    case MOXA_ASPP_MON: {
1755        int mcr, status;
1756
1757        spin_lock_irq(&info->slock);
1758        status = mxser_get_msr(info->ioaddr, 1, tty->index);
1759        mxser_check_modem_status(tty, info, status);
1760
1761        mcr = inb(info->ioaddr + UART_MCR);
1762        spin_unlock_irq(&info->slock);
1763
1764        if (mcr & MOXA_MUST_MCR_XON_FLAG)
1765            info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFHOLD;
1766        else
1767            info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFHOLD;
1768
1769        if (mcr & MOXA_MUST_MCR_TX_XON)
1770            info->mon_data.hold_reason &= ~NPPI_NOTIFY_XOFFXENT;
1771        else
1772            info->mon_data.hold_reason |= NPPI_NOTIFY_XOFFXENT;
1773
1774        if (tty->hw_stopped)
1775            info->mon_data.hold_reason |= NPPI_NOTIFY_CTSHOLD;
1776        else
1777            info->mon_data.hold_reason &= ~NPPI_NOTIFY_CTSHOLD;
1778
1779        if (copy_to_user(argp, &info->mon_data,
1780                sizeof(struct mxser_mon)))
1781            return -EFAULT;
1782
1783        return 0;
1784    }
1785    case MOXA_ASPP_LSTATUS: {
1786        if (put_user(info->err_shadow, (unsigned char __user *)argp))
1787            return -EFAULT;
1788
1789        info->err_shadow = 0;
1790        return 0;
1791    }
1792    case MOXA_SET_BAUD_METHOD: {
1793        int method;
1794
1795        if (get_user(method, (int __user *)argp))
1796            return -EFAULT;
1797        mxser_set_baud_method[tty->index] = method;
1798        return put_user(method, (int __user *)argp);
1799    }
1800    default:
1801        return -ENOIOCTLCMD;
1802    }
1803    return 0;
1804}
1805
1806    /*
1807     * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1808     * Return: write counters to the user passed counter struct
1809     * NB: both 1->0 and 0->1 transitions are counted except for
1810     * RI where only 0->1 is counted.
1811     */
1812
1813static int mxser_get_icount(struct tty_struct *tty,
1814        struct serial_icounter_struct *icount)
1815
1816{
1817    struct mxser_port *info = tty->driver_data;
1818    struct async_icount cnow;
1819    unsigned long flags;
1820
1821    spin_lock_irqsave(&info->slock, flags);
1822    cnow = info->icount;
1823    spin_unlock_irqrestore(&info->slock, flags);
1824
1825    icount->frame = cnow.frame;
1826    icount->brk = cnow.brk;
1827    icount->overrun = cnow.overrun;
1828    icount->buf_overrun = cnow.buf_overrun;
1829    icount->parity = cnow.parity;
1830    icount->rx = cnow.rx;
1831    icount->tx = cnow.tx;
1832    icount->cts = cnow.cts;
1833    icount->dsr = cnow.dsr;
1834    icount->rng = cnow.rng;
1835    icount->dcd = cnow.dcd;
1836    return 0;
1837}
1838
1839static void mxser_stoprx(struct tty_struct *tty)
1840{
1841    struct mxser_port *info = tty->driver_data;
1842
1843    info->ldisc_stop_rx = 1;
1844    if (I_IXOFF(tty)) {
1845        if (info->board->chip_flag) {
1846            info->IER &= ~MOXA_MUST_RECV_ISR;
1847            outb(info->IER, info->ioaddr + UART_IER);
1848        } else {
1849            info->x_char = STOP_CHAR(tty);
1850            outb(0, info->ioaddr + UART_IER);
1851            info->IER |= UART_IER_THRI;
1852            outb(info->IER, info->ioaddr + UART_IER);
1853        }
1854    }
1855
1856    if (tty->termios.c_cflag & CRTSCTS) {
1857        info->MCR &= ~UART_MCR_RTS;
1858        outb(info->MCR, info->ioaddr + UART_MCR);
1859    }
1860}
1861
1862/*
1863 * This routine is called by the upper-layer tty layer to signal that
1864 * incoming characters should be throttled.
1865 */
1866static void mxser_throttle(struct tty_struct *tty)
1867{
1868    mxser_stoprx(tty);
1869}
1870
1871static void mxser_unthrottle(struct tty_struct *tty)
1872{
1873    struct mxser_port *info = tty->driver_data;
1874
1875    /* startrx */
1876    info->ldisc_stop_rx = 0;
1877    if (I_IXOFF(tty)) {
1878        if (info->x_char)
1879            info->x_char = 0;
1880        else {
1881            if (info->board->chip_flag) {
1882                info->IER |= MOXA_MUST_RECV_ISR;
1883                outb(info->IER, info->ioaddr + UART_IER);
1884            } else {
1885                info->x_char = START_CHAR(tty);
1886                outb(0, info->ioaddr + UART_IER);
1887                info->IER |= UART_IER_THRI;
1888                outb(info->IER, info->ioaddr + UART_IER);
1889            }
1890        }
1891    }
1892
1893    if (tty->termios.c_cflag & CRTSCTS) {
1894        info->MCR |= UART_MCR_RTS;
1895        outb(info->MCR, info->ioaddr + UART_MCR);
1896    }
1897}
1898
1899/*
1900 * mxser_stop() and mxser_start()
1901 *
1902 * This routines are called before setting or resetting tty->stopped.
1903 * They enable or disable transmitter interrupts, as necessary.
1904 */
1905static void mxser_stop(struct tty_struct *tty)
1906{
1907    struct mxser_port *info = tty->driver_data;
1908    unsigned long flags;
1909
1910    spin_lock_irqsave(&info->slock, flags);
1911    if (info->IER & UART_IER_THRI) {
1912        info->IER &= ~UART_IER_THRI;
1913        outb(info->IER, info->ioaddr + UART_IER);
1914    }
1915    spin_unlock_irqrestore(&info->slock, flags);
1916}
1917
1918static void mxser_start(struct tty_struct *tty)
1919{
1920    struct mxser_port *info = tty->driver_data;
1921    unsigned long flags;
1922
1923    spin_lock_irqsave(&info->slock, flags);
1924    if (info->xmit_cnt && info->port.xmit_buf) {
1925        outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1926        info->IER |= UART_IER_THRI;
1927        outb(info->IER, info->ioaddr + UART_IER);
1928    }
1929    spin_unlock_irqrestore(&info->slock, flags);
1930}
1931
1932static void mxser_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1933{
1934    struct mxser_port *info = tty->driver_data;
1935    unsigned long flags;
1936
1937    spin_lock_irqsave(&info->slock, flags);
1938    mxser_change_speed(tty, old_termios);
1939    spin_unlock_irqrestore(&info->slock, flags);
1940
1941    if ((old_termios->c_cflag & CRTSCTS) &&
1942            !(tty->termios.c_cflag & CRTSCTS)) {
1943        tty->hw_stopped = 0;
1944        mxser_start(tty);
1945    }
1946
1947    /* Handle sw stopped */
1948    if ((old_termios->c_iflag & IXON) &&
1949            !(tty->termios.c_iflag & IXON)) {
1950        tty->stopped = 0;
1951
1952        if (info->board->chip_flag) {
1953            spin_lock_irqsave(&info->slock, flags);
1954            mxser_disable_must_rx_software_flow_control(
1955                    info->ioaddr);
1956            spin_unlock_irqrestore(&info->slock, flags);
1957        }
1958
1959        mxser_start(tty);
1960    }
1961}
1962
1963/*
1964 * mxser_wait_until_sent() --- wait until the transmitter is empty
1965 */
1966static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
1967{
1968    struct mxser_port *info = tty->driver_data;
1969    unsigned long orig_jiffies, char_time;
1970    unsigned long flags;
1971    int lsr;
1972
1973    if (info->type == PORT_UNKNOWN)
1974        return;
1975
1976    if (info->xmit_fifo_size == 0)
1977        return; /* Just in case.... */
1978
1979    orig_jiffies = jiffies;
1980    /*
1981     * Set the check interval to be 1/5 of the estimated time to
1982     * send a single character, and make it at least 1. The check
1983     * interval should also be less than the timeout.
1984     *
1985     * Note: we have to use pretty tight timings here to satisfy
1986     * the NIST-PCTS.
1987     */
1988    char_time = (info->timeout - HZ / 50) / info->xmit_fifo_size;
1989    char_time = char_time / 5;
1990    if (char_time == 0)
1991        char_time = 1;
1992    if (timeout && timeout < char_time)
1993        char_time = timeout;
1994    /*
1995     * If the transmitter hasn't cleared in twice the approximate
1996     * amount of time to send the entire FIFO, it probably won't
1997     * ever clear. This assumes the UART isn't doing flow
1998     * control, which is currently the case. Hence, if it ever
1999     * takes longer than info->timeout, this is probably due to a
2000     * UART bug of some kind. So, we clamp the timeout parameter at
2001     * 2*info->timeout.
2002     */
2003    if (!timeout || timeout > 2 * info->timeout)
2004        timeout = 2 * info->timeout;
2005
2006    spin_lock_irqsave(&info->slock, flags);
2007    while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
2008        spin_unlock_irqrestore(&info->slock, flags);
2009        schedule_timeout_interruptible(char_time);
2010        spin_lock_irqsave(&info->slock, flags);
2011        if (signal_pending(current))
2012            break;
2013        if (timeout && time_after(jiffies, orig_jiffies + timeout))
2014            break;
2015    }
2016    spin_unlock_irqrestore(&info->slock, flags);
2017    set_current_state(TASK_RUNNING);
2018}
2019
2020/*
2021 * This routine is called by tty_hangup() when a hangup is signaled.
2022 */
2023static void mxser_hangup(struct tty_struct *tty)
2024{
2025    struct mxser_port *info = tty->driver_data;
2026
2027    mxser_flush_buffer(tty);
2028    tty_port_hangup(&info->port);
2029}
2030
2031/*
2032 * mxser_rs_break() --- routine which turns the break handling on or off
2033 */
2034static int mxser_rs_break(struct tty_struct *tty, int break_state)
2035{
2036    struct mxser_port *info = tty->driver_data;
2037    unsigned long flags;
2038
2039    spin_lock_irqsave(&info->slock, flags);
2040    if (break_state == -1)
2041        outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
2042            info->ioaddr + UART_LCR);
2043    else
2044        outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
2045            info->ioaddr + UART_LCR);
2046    spin_unlock_irqrestore(&info->slock, flags);
2047    return 0;
2048}
2049
2050static void mxser_receive_chars(struct tty_struct *tty,
2051                struct mxser_port *port, int *status)
2052{
2053    unsigned char ch, gdl;
2054    int ignored = 0;
2055    int cnt = 0;
2056    int recv_room;
2057    int max = 256;
2058
2059    recv_room = tty->receive_room;
2060    if (recv_room == 0 && !port->ldisc_stop_rx)
2061        mxser_stoprx(tty);
2062    if (port->board->chip_flag != MOXA_OTHER_UART) {
2063
2064        if (*status & UART_LSR_SPECIAL)
2065            goto intr_old;
2066        if (port->board->chip_flag == MOXA_MUST_MU860_HWID &&
2067                (*status & MOXA_MUST_LSR_RERR))
2068            goto intr_old;
2069        if (*status & MOXA_MUST_LSR_RERR)
2070            goto intr_old;
2071
2072        gdl = inb(port->ioaddr + MOXA_MUST_GDL_REGISTER);
2073
2074        if (port->board->chip_flag == MOXA_MUST_MU150_HWID)
2075            gdl &= MOXA_MUST_GDL_MASK;
2076        if (gdl >= recv_room) {
2077            if (!port->ldisc_stop_rx)
2078                mxser_stoprx(tty);
2079        }
2080        while (gdl--) {
2081            ch = inb(port->ioaddr + UART_RX);
2082            tty_insert_flip_char(&port->port, ch, 0);
2083            cnt++;
2084        }
2085        goto end_intr;
2086    }
2087intr_old:
2088
2089    do {
2090        if (max-- < 0)
2091            break;
2092
2093        ch = inb(port->ioaddr + UART_RX);
2094        if (port->board->chip_flag && (*status & UART_LSR_OE))
2095            outb(0x23, port->ioaddr + UART_FCR);
2096        *status &= port->read_status_mask;
2097        if (*status & port->ignore_status_mask) {
2098            if (++ignored > 100)
2099                break;
2100        } else {
2101            char flag = 0;
2102            if (*status & UART_LSR_SPECIAL) {
2103                if (*status & UART_LSR_BI) {
2104                    flag = TTY_BREAK;
2105                    port->icount.brk++;
2106
2107                    if (port->port.flags & ASYNC_SAK)
2108                        do_SAK(tty);
2109                } else if (*status & UART_LSR_PE) {
2110                    flag = TTY_PARITY;
2111                    port->icount.parity++;
2112                } else if (*status & UART_LSR_FE) {
2113                    flag = TTY_FRAME;
2114                    port->icount.frame++;
2115                } else if (*status & UART_LSR_OE) {
2116                    flag = TTY_OVERRUN;
2117                    port->icount.overrun++;
2118                } else
2119                    flag = TTY_BREAK;
2120            }
2121            tty_insert_flip_char(&port->port, ch, flag);
2122            cnt++;
2123            if (cnt >= recv_room) {
2124                if (!port->ldisc_stop_rx)
2125                    mxser_stoprx(tty);
2126                break;
2127            }
2128
2129        }
2130
2131        if (port->board->chip_flag)
2132            break;
2133
2134        *status = inb(port->ioaddr + UART_LSR);
2135    } while (*status & UART_LSR_DR);
2136
2137end_intr:
2138    mxvar_log.rxcnt[tty->index] += cnt;
2139    port->mon_data.rxcnt += cnt;
2140    port->mon_data.up_rxcnt += cnt;
2141
2142    /*
2143     * We are called from an interrupt context with &port->slock
2144     * being held. Drop it temporarily in order to prevent
2145     * recursive locking.
2146     */
2147    spin_unlock(&port->slock);
2148    tty_flip_buffer_push(&port->port);
2149    spin_lock(&port->slock);
2150}
2151
2152static void mxser_transmit_chars(struct tty_struct *tty, struct mxser_port *port)
2153{
2154    int count, cnt;
2155
2156    if (port->x_char) {
2157        outb(port->x_char, port->ioaddr + UART_TX);
2158        port->x_char = 0;
2159        mxvar_log.txcnt[tty->index]++;
2160        port->mon_data.txcnt++;
2161        port->mon_data.up_txcnt++;
2162        port->icount.tx++;
2163        return;
2164    }
2165
2166    if (port->port.xmit_buf == NULL)
2167        return;
2168
2169    if (port->xmit_cnt <= 0 || tty->stopped ||
2170            (tty->hw_stopped &&
2171            (port->type != PORT_16550A) &&
2172            (!port->board->chip_flag))) {
2173        port->IER &= ~UART_IER_THRI;
2174        outb(port->IER, port->ioaddr + UART_IER);
2175        return;
2176    }
2177
2178    cnt = port->xmit_cnt;
2179    count = port->xmit_fifo_size;
2180    do {
2181        outb(port->port.xmit_buf[port->xmit_tail++],
2182            port->ioaddr + UART_TX);
2183        port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE - 1);
2184        if (--port->xmit_cnt <= 0)
2185            break;
2186    } while (--count > 0);
2187    mxvar_log.txcnt[tty->index] += (cnt - port->xmit_cnt);
2188
2189    port->mon_data.txcnt += (cnt - port->xmit_cnt);
2190    port->mon_data.up_txcnt += (cnt - port->xmit_cnt);
2191    port->icount.tx += (cnt - port->xmit_cnt);
2192
2193    if (port->xmit_cnt < WAKEUP_CHARS)
2194        tty_wakeup(tty);
2195
2196    if (port->xmit_cnt <= 0) {
2197        port->IER &= ~UART_IER_THRI;
2198        outb(port->IER, port->ioaddr + UART_IER);
2199    }
2200}
2201
2202/*
2203 * This is the serial driver's generic interrupt routine
2204 */
2205static irqreturn_t mxser_interrupt(int irq, void *dev_id)
2206{
2207    int status, iir, i;
2208    struct mxser_board *brd = NULL;
2209    struct mxser_port *port;
2210    int max, irqbits, bits, msr;
2211    unsigned int int_cnt, pass_counter = 0;
2212    int handled = IRQ_NONE;
2213    struct tty_struct *tty;
2214
2215    for (i = 0; i < MXSER_BOARDS; i++)
2216        if (dev_id == &mxser_boards[i]) {
2217            brd = dev_id;
2218            break;
2219        }
2220
2221    if (i == MXSER_BOARDS)
2222        goto irq_stop;
2223    if (brd == NULL)
2224        goto irq_stop;
2225    max = brd->info->nports;
2226    while (pass_counter++ < MXSER_ISR_PASS_LIMIT) {
2227        irqbits = inb(brd->vector) & brd->vector_mask;
2228        if (irqbits == brd->vector_mask)
2229            break;
2230
2231        handled = IRQ_HANDLED;
2232        for (i = 0, bits = 1; i < max; i++, irqbits |= bits, bits <<= 1) {
2233            if (irqbits == brd->vector_mask)
2234                break;
2235            if (bits & irqbits)
2236                continue;
2237            port = &brd->ports[i];
2238
2239            int_cnt = 0;
2240            spin_lock(&port->slock);
2241            do {
2242                iir = inb(port->ioaddr + UART_IIR);
2243                if (iir & UART_IIR_NO_INT)
2244                    break;
2245                iir &= MOXA_MUST_IIR_MASK;
2246                tty = tty_port_tty_get(&port->port);
2247                if (!tty ||
2248                        (port->port.flags & ASYNC_CLOSING) ||
2249                        !(port->port.flags &
2250                            ASYNC_INITIALIZED)) {
2251                    status = inb(port->ioaddr + UART_LSR);
2252                    outb(0x27, port->ioaddr + UART_FCR);
2253                    inb(port->ioaddr + UART_MSR);
2254                    tty_kref_put(tty);
2255                    break;
2256                }
2257
2258                status = inb(port->ioaddr + UART_LSR);
2259
2260                if (status & UART_LSR_PE)
2261                    port->err_shadow |= NPPI_NOTIFY_PARITY;
2262                if (status & UART_LSR_FE)
2263                    port->err_shadow |= NPPI_NOTIFY_FRAMING;
2264                if (status & UART_LSR_OE)
2265                    port->err_shadow |=
2266                        NPPI_NOTIFY_HW_OVERRUN;
2267                if (status & UART_LSR_BI)
2268                    port->err_shadow |= NPPI_NOTIFY_BREAK;
2269
2270                if (port->board->chip_flag) {
2271                    if (iir == MOXA_MUST_IIR_GDA ||
2272                        iir == MOXA_MUST_IIR_RDA ||
2273                        iir == MOXA_MUST_IIR_RTO ||
2274                        iir == MOXA_MUST_IIR_LSR)
2275                        mxser_receive_chars(tty, port,
2276                                &status);
2277
2278                } else {
2279                    status &= port->read_status_mask;
2280                    if (status & UART_LSR_DR)
2281                        mxser_receive_chars(tty, port,
2282                                &status);
2283                }
2284                msr = inb(port->ioaddr + UART_MSR);
2285                if (msr & UART_MSR_ANY_DELTA)
2286                    mxser_check_modem_status(tty, port, msr);
2287
2288                if (port->board->chip_flag) {
2289                    if (iir == 0x02 && (status &
2290                                UART_LSR_THRE))
2291                        mxser_transmit_chars(tty, port);
2292                } else {
2293                    if (status & UART_LSR_THRE)
2294                        mxser_transmit_chars(tty, port);
2295                }
2296                tty_kref_put(tty);
2297            } while (int_cnt++ < MXSER_ISR_PASS_LIMIT);
2298            spin_unlock(&port->slock);
2299        }
2300    }
2301
2302irq_stop:
2303    return handled;
2304}
2305
2306static const struct tty_operations mxser_ops = {
2307    .open = mxser_open,
2308    .close = mxser_close,
2309    .write = mxser_write,
2310    .put_char = mxser_put_char,
2311    .flush_chars = mxser_flush_chars,
2312    .write_room = mxser_write_room,
2313    .chars_in_buffer = mxser_chars_in_buffer,
2314    .flush_buffer = mxser_flush_buffer,
2315    .ioctl = mxser_ioctl,
2316    .throttle = mxser_throttle,
2317    .unthrottle = mxser_unthrottle,
2318    .set_termios = mxser_set_termios,
2319    .stop = mxser_stop,
2320    .start = mxser_start,
2321    .hangup = mxser_hangup,
2322    .break_ctl = mxser_rs_break,
2323    .wait_until_sent = mxser_wait_until_sent,
2324    .tiocmget = mxser_tiocmget,
2325    .tiocmset = mxser_tiocmset,
2326    .get_icount = mxser_get_icount,
2327};
2328
2329static struct tty_port_operations mxser_port_ops = {
2330    .carrier_raised = mxser_carrier_raised,
2331    .dtr_rts = mxser_dtr_rts,
2332    .activate = mxser_activate,
2333    .shutdown = mxser_shutdown_port,
2334};
2335
2336/*
2337 * The MOXA Smartio/Industio serial driver boot-time initialization code!
2338 */
2339
2340static bool allow_overlapping_vector;
2341module_param(allow_overlapping_vector, bool, S_IRUGO);
2342MODULE_PARM_DESC(allow_overlapping_vector, "whether we allow ISA cards to be configured such that vector overlabs IO ports (default=no)");
2343
2344static bool mxser_overlapping_vector(struct mxser_board *brd)
2345{
2346    return allow_overlapping_vector &&
2347        brd->vector >= brd->ports[0].ioaddr &&
2348        brd->vector < brd->ports[0].ioaddr + 8 * brd->info->nports;
2349}
2350
2351static int mxser_request_vector(struct mxser_board *brd)
2352{
2353    if (mxser_overlapping_vector(brd))
2354        return 0;
2355    return request_region(brd->vector, 1, "mxser(vector)") ? 0 : -EIO;
2356}
2357
2358static void mxser_release_vector(struct mxser_board *brd)
2359{
2360    if (mxser_overlapping_vector(brd))
2361        return;
2362    release_region(brd->vector, 1);
2363}
2364
2365static void mxser_release_ISA_res(struct mxser_board *brd)
2366{
2367    release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
2368    mxser_release_vector(brd);
2369}
2370
2371static int mxser_initbrd(struct mxser_board *brd,
2372        struct pci_dev *pdev)
2373{
2374    struct mxser_port *info;
2375    unsigned int i;
2376    int retval;
2377
2378    printk(KERN_INFO "mxser: max. baud rate = %d bps\n",
2379            brd->ports[0].max_baud);
2380
2381    for (i = 0; i < brd->info->nports; i++) {
2382        info = &brd->ports[i];
2383        tty_port_init(&info->port);
2384        info->port.ops = &mxser_port_ops;
2385        info->board = brd;
2386        info->stop_rx = 0;
2387        info->ldisc_stop_rx = 0;
2388
2389        /* Enhance mode enabled here */
2390        if (brd->chip_flag != MOXA_OTHER_UART)
2391            mxser_enable_must_enchance_mode(info->ioaddr);
2392
2393        info->port.flags = ASYNC_SHARE_IRQ;
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
2424static 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
2435static 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
2545err_irqconflict:
2546    printk(KERN_ERR "mxser: invalid interrupt number\n");
2547    return -EIO;
2548}
2549
2550static 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;
2656err_relbrd:
2657    for (i = 0; i < brd->info->nports; i++)
2658        tty_port_destroy(&brd->ports[i].port);
2659    free_irq(brd->irq, brd);
2660err_rel3:
2661    pci_release_region(pdev, 3);
2662err_zero:
2663    brd->info = NULL;
2664    pci_release_region(pdev, 2);
2665err_dis:
2666    pci_disable_device(pdev);
2667err:
2668    return retval;
2669#else
2670    return -ENODEV;
2671#endif
2672}
2673
2674static 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
2688static struct pci_driver mxser_driver = {
2689    .name = "mxser",
2690    .id_table = mxser_pcibrds,
2691    .probe = mxser_probe,
2692    .remove = mxser_remove
2693};
2694
2695static 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;
2781err_unr:
2782    tty_unregister_driver(mxvar_sdriver);
2783err_put:
2784    put_tty_driver(mxvar_sdriver);
2785    return retval;
2786}
2787
2788static 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
2805module_init(mxser_module_init);
2806module_exit(mxser_module_exit);
2807

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