mxser_new.c 70.7 KB
Newer Older
1
2
3
/*
 *          mxser.c  -- MOXA Smartio/Industio family multiport serial driver.
 *
4
 *      Copyright (C) 1999-2006  Moxa Technologies (support@moxa.com.tw).
5
 *	Copyright (C) 2006       Jiri Slaby <jirislaby@gmail.com>
6
 *
7
8
9
 *      This code is loosely based on the 1.8 moxa driver which is based on
 *	Linux serial driver, written by Linus Torvalds, Theodore T'so and
 *	others.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *	Fed through a cleanup, indent and remove of non 2.6 code by Alan Cox
 *	<alan@redhat.com>. The original 1.8 code is available on www.moxa.com.
 *	- Fixed x86_64 cleanness
 *	- Fixed sleep with spinlock held in mxser_send_break
 */

#include <linux/module.h>
#include <linux/autoconf.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/serial_reg.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/fcntl.h>
#include <linux/ptrace.h>
#include <linux/gfp.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <linux/delay.h>
#include <linux/pci.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/bitops.h>
#include <asm/uaccess.h>

50
#include "mxser_new.h"
51

52
#define	MXSER_VERSION	"2.0"
53
54
55
56
57
58
59
60
61
#define	MXSERMAJOR	 174
#define	MXSERCUMAJOR	 175

#define	MXSER_EVENT_TXLOW	1
#define	MXSER_EVENT_HANGUP	2

#define MXSER_BOARDS		4	/* Max. boards */
#define MXSER_PORTS		32	/* Max. ports */
#define MXSER_PORTS_PER_BOARD	8	/* Max. ports per board */
62
#define MXSER_ISR_PASS_LIMIT	99999L
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86

#define	MXSER_ERR_IOADDR	-1
#define	MXSER_ERR_IRQ		-2
#define	MXSER_ERR_IRQ_CONFLIT	-3
#define	MXSER_ERR_VECTOR	-4

#define SERIAL_TYPE_NORMAL	1
#define SERIAL_TYPE_CALLOUT	2

#define WAKEUP_CHARS		256

#define UART_MCR_AFE		0x20
#define UART_LSR_SPECIAL	0x1E

#define RELEVANT_IFLAG(iflag)	(iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK|\
					  IXON|IXOFF))

#define C168_ASIC_ID    1
#define C104_ASIC_ID    2
#define C102_ASIC_ID	0xB
#define CI132_ASIC_ID	4
#define CI134_ASIC_ID	3
#define CI104J_ASIC_ID  5

87
88
#define MXSER_HIGHBAUD	1
#define MXSER_HAS2	2
89
90

/* This is only for PCI */
91
static const struct {
92
93
94
95
96
97
98
99
	int type;
	int tx_fifo;
	int rx_fifo;
	int xmit_fifo_size;
	int rx_high_water;
	int rx_trigger;
	int rx_low_water;
	long max_baud;
100
} Gpci_uart_info[] = {
101
102
103
104
	{MOXA_OTHER_UART, 16, 16, 16, 14, 14, 1, 921600L},
	{MOXA_MUST_MU150_HWID, 64, 64, 64, 48, 48, 16, 230400L},
	{MOXA_MUST_MU860_HWID, 128, 128, 128, 96, 96, 32, 921600L}
};
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
#define UART_INFO_NUM	ARRAY_SIZE(Gpci_uart_info)

struct mxser_cardinfo {
	unsigned int nports;
	char *name;
	unsigned int flags;
};

static const struct mxser_cardinfo mxser_cards[] = {
	{ 8, "C168 series", },			/* C168-ISA */
	{ 4, "C104 series", },			/* C104-ISA */
	{ 4, "CI-104J series", },		/* CI104J */
	{ 8, "C168H/PCI series", },		/* C168-PCI */
	{ 4, "C104H/PCI series", },		/* C104-PCI */
	{ 4, "C102 series", MXSER_HAS2 },	/* C102-ISA */
	{ 4, "CI-132 series", MXSER_HAS2 },	/* CI132 */
	{ 4, "CI-134 series", },		/* CI134 */
	{ 2, "CP-132 series", },		/* CP132 */
	{ 4, "CP-114 series", },		/* CP114 */
	{ 4, "CT-114 series", },		/* CT114 */
	{ 2, "CP-102 series", MXSER_HIGHBAUD },	/* CP102 */
	{ 4, "CP-104U series", },		/* CP104U */
	{ 8, "CP-168U series", },		/* CP168U */
	{ 2, "CP-132U series", },		/* CP132U */
	{ 4, "CP-134U series", },		/* CP134U */
	{ 4, "CP-104JU series", },		/* CP104JU */
	{ 8, "Moxa UC7000 Serial", },		/* RC7000 */
	{ 8, "CP-118U series", },		/* CP118U */
	{ 2, "CP-102UL series", },		/* CP102UL */
	{ 2, "CP-102U series", },		/* CP102U */
	{ 8, "CP-118EL series", },		/* CP118EL */
	{ 8, "CP-168EL series", },		/* CP168EL */
	{ 4, "CP-104EL series", }		/* CP104EL */
};
139

140
141
/* driver_data correspond to the lines in the structure above
   see also ISA probe function before you change something */
142
static struct pci_device_id mxser_pcibrds[] = {
143
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C168),
144
		.driver_data = 3 },
145
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_C104),
146
		.driver_data = 4 },
147
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132),
148
		.driver_data = 8 },
149
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP114),
150
		.driver_data = 9 },
151
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CT114),
152
		.driver_data = 10 },
153
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102),
154
		.driver_data = 11 },
155
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104U),
156
		.driver_data = 12 },
157
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168U),
158
		.driver_data = 13 },
159
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP132U),
160
		.driver_data = 14 },
161
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP134U),
162
		.driver_data = 15 },
163
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104JU),
164
		.driver_data = 16 },
165
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_RC7000),
166
		.driver_data = 17 },
167
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118U),
168
		.driver_data = 18 },
169
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102UL),
170
		.driver_data = 19 },
171
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP102U),
172
		.driver_data = 20 },
173
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP118EL),
174
		.driver_data = 21 },
175
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP168EL),
176
		.driver_data = 22 },
177
	{ PCI_DEVICE(PCI_VENDOR_ID_MOXA, PCI_DEVICE_ID_MOXA_CP104EL),
178
		.driver_data = 23 },
179
	{ }
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
};
MODULE_DEVICE_TABLE(pci, mxser_pcibrds);

static int ioaddr[MXSER_BOARDS] = { 0, 0, 0, 0 };
static int ttymajor = MXSERMAJOR;
static int calloutmajor = MXSERCUMAJOR;

/* Variables for insmod */

MODULE_AUTHOR("Casper Yang");
MODULE_DESCRIPTION("MOXA Smartio/Industio Family Multiport Board Device Driver");
module_param_array(ioaddr, int, NULL, 0);
module_param(ttymajor, int, 0);
MODULE_LICENSE("GPL");

struct mxser_log {
	int tick;
	unsigned long rxcnt[MXSER_PORTS];
	unsigned long txcnt[MXSER_PORTS];
};


struct mxser_mon {
	unsigned long rxcnt;
	unsigned long txcnt;
	unsigned long up_rxcnt;
	unsigned long up_txcnt;
	int modem_status;
	unsigned char hold_reason;
};

struct mxser_mon_ext {
	unsigned long rx_cnt[32];
	unsigned long tx_cnt[32];
	unsigned long up_rxcnt[32];
	unsigned long up_txcnt[32];
	int modem_status[32];

	long baudrate[32];
	int databits[32];
	int stopbits[32];
	int parity[32];
	int flowctrl[32];
	int fifo[32];
	int iftype[32];
};

227
228
229
230
231
232
233
234
235
struct mxser_board;

struct mxser_port {
	struct mxser_board *board;
	struct tty_struct *tty;

	unsigned long ioaddr;
	unsigned long opmode_ioaddr;
	int max_baud;
236
237
238
239
240

	int rx_high_water;
	int rx_trigger;		/* Rx fifo trigger level */
	int rx_low_water;
	int baud_base;		/* max. speed */
241
	long realbaud;
242
	int type;		/* UART type */
243
244
245
246
	int flags;		/* defined in tty.h */
	long session;		/* Session of opening process */
	long pgrp;		/* pgrp of opening process */

247
248
249
	int x_char;		/* xon/xoff character */
	int IER;		/* Interrupt Enable Register */
	int MCR;		/* Modem control register */
250
251
252
253
254
255
256
257

	unsigned char stop_rx;
	unsigned char ldisc_stop_rx;

	int custom_divisor;
	int close_delay;
	unsigned short closing_wait;
	unsigned char err_shadow;
258
	unsigned long event;
259

260
261
	int count;		/* # of fd on device */
	int blocked_open;	/* # of blocked opens */
262
263
264
265
266
267
	struct async_icount icount; /* kernel counters for 4 input interrupts */
	int timeout;

	int read_status_mask;
	int ignore_status_mask;
	int xmit_fifo_size;
268
269
270
271
	unsigned char *xmit_buf;
	int xmit_head;
	int xmit_tail;
	int xmit_cnt;
272

273
274
	struct termios normal_termios;
	struct termios callout_termios;
275
276
277
278
279

	struct mxser_mon mon_data;

	spinlock_t slock;
	struct work_struct tqueue;
280
281
282
	wait_queue_head_t open_wait;
	wait_queue_head_t close_wait;
	wait_queue_head_t delta_msr_wait;
283
284
285
286
287
288
};

struct mxser_board {
	struct pci_dev *pdev; /* temporary (until pci probing) */

	int irq;
289
	const struct mxser_cardinfo *info;
290
291
292
293
294
295
296
	unsigned long vector;
	unsigned long vector_mask;

	int chip_flag;
	int uart_type;

	struct mxser_port ports[MXSER_PORTS_PER_BOARD];
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
};

struct mxser_mstatus {
	tcflag_t cflag;
	int cts;
	int dsr;
	int ri;
	int dcd;
};

static struct mxser_mstatus GMStatus[MXSER_PORTS];

static int mxserBoardCAP[MXSER_BOARDS] = {
	0, 0, 0, 0
	/*  0x180, 0x280, 0x200, 0x320 */
};

314
static struct mxser_board mxser_boards[MXSER_BOARDS];
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
static struct tty_driver *mxvar_sdriver;
static struct tty_struct *mxvar_tty[MXSER_PORTS + 1];
static struct termios *mxvar_termios[MXSER_PORTS + 1];
static struct termios *mxvar_termios_locked[MXSER_PORTS + 1];
static struct mxser_log mxvar_log;
static int mxvar_diagflag;
static unsigned char mxser_msr[MXSER_PORTS + 1];
static struct mxser_mon_ext mon_data_ext;
static int mxser_set_baud_method[MXSER_PORTS + 1];
static spinlock_t gm_lock;

static int CheckIsMoxaMust(int io)
{
	u8 oldmcr, hwid;
	int i;

	outb(0, io + UART_LCR);
	DISABLE_MOXA_MUST_ENCHANCE_MODE(io);
	oldmcr = inb(io + UART_MCR);
	outb(0, io + UART_MCR);
	SET_MOXA_MUST_XON1_VALUE(io, 0x11);
	if ((hwid = inb(io + UART_MCR)) != 0) {
		outb(oldmcr, io + UART_MCR);
		return MOXA_OTHER_UART;
	}

	GET_MOXA_MUST_HARDWARE_ID(io, &hwid);
342
343
	for (i = 1; i < UART_INFO_NUM; i++) { /* 0 = OTHER_UART */
		if (hwid == Gpci_uart_info[i].type)
344
345
346
347
348
			return (int)hwid;
	}
	return MOXA_OTHER_UART;
}

349
static void process_txrx_fifo(struct mxser_port *info)
350
351
352
353
354
355
356
357
{
	int i;

	if ((info->type == PORT_16450) || (info->type == PORT_8250)) {
		info->rx_trigger = 1;
		info->rx_high_water = 1;
		info->rx_low_water = 1;
		info->xmit_fifo_size = 1;
358
359
360
	} else
		for (i = 0; i < UART_INFO_NUM; i++)
			if (info->board->chip_flag == Gpci_uart_info[i].type) {
361
362
363
364
365
366
367
368
				info->rx_trigger = Gpci_uart_info[i].rx_trigger;
				info->rx_low_water = Gpci_uart_info[i].rx_low_water;
				info->rx_high_water = Gpci_uart_info[i].rx_high_water;
				info->xmit_fifo_size = Gpci_uart_info[i].xmit_fifo_size;
				break;
			}
}

369
static void mxser_do_softint(void *private_)
370
{
371
372
	struct mxser_port *info = private_;
	struct tty_struct *tty;
373

374
	tty = info->tty;
375

376
377
378
379
380
	if (test_and_clear_bit(MXSER_EVENT_TXLOW, &info->event))
		tty_wakeup(tty);
	if (test_and_clear_bit(MXSER_EVENT_HANGUP, &info->event))
		tty_hangup(tty);
}
381

382
383
384
static unsigned char mxser_get_msr(int baseaddr, int mode, int port)
{
	unsigned char status = 0;
385

386
	status = inb(baseaddr + UART_MSR);
387

388
389
390
391
392
	mxser_msr[port] &= 0x0F;
	mxser_msr[port] |= status;
	status = mxser_msr[port];
	if (mode)
		mxser_msr[port] = 0;
393

394
395
	return status;
}
396

397
398
399
400
401
402
403
404
405
406
407
408
static int mxser_block_til_ready(struct tty_struct *tty, struct file *filp,
		struct mxser_port *port)
{
	DECLARE_WAITQUEUE(wait, current);
	int retval;
	int do_clocal = 0;
	unsigned long flags;

	/*
	 * If non-blocking mode is set, or the port is not enabled,
	 * then make the check up front and then exit.
	 */
409
410
	if ((filp->f_flags & O_NONBLOCK) ||
			test_bit(TTY_IO_ERROR, &tty->flags)) {
411
412
		port->flags |= ASYNC_NORMAL_ACTIVE;
		return 0;
413
	}
414
415
416
417

	if (tty->termios->c_cflag & CLOCAL)
		do_clocal = 1;

418
	/*
419
420
421
422
423
	 * Block waiting for the carrier detect and the line to become
	 * free (i.e., not in use by the callout).  While we are in
	 * this loop, port->count is dropped by one, so that
	 * mxser_close() knows when to free things.  We restore it upon
	 * exit, either normal or abnormal.
424
	 */
425
426
	retval = 0;
	add_wait_queue(&port->open_wait, &wait);
427

428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
	spin_lock_irqsave(&port->slock, flags);
	if (!tty_hung_up_p(filp))
		port->count--;
	spin_unlock_irqrestore(&port->slock, flags);
	port->blocked_open++;
	while (1) {
		spin_lock_irqsave(&port->slock, flags);
		outb(inb(port->ioaddr + UART_MCR) |
			UART_MCR_DTR | UART_MCR_RTS, port->ioaddr + UART_MCR);
		spin_unlock_irqrestore(&port->slock, flags);
		set_current_state(TASK_INTERRUPTIBLE);
		if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)) {
			if (port->flags & ASYNC_HUP_NOTIFY)
				retval = -EAGAIN;
			else
				retval = -ERESTARTSYS;
			break;
		}
		if (!(port->flags & ASYNC_CLOSING) &&
				(do_clocal ||
				(inb(port->ioaddr + UART_MSR) & UART_MSR_DCD)))
			break;
		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			break;
		}
		schedule();
455
	}
456
457
458
459
460
461
462
463
	set_current_state(TASK_RUNNING);
	remove_wait_queue(&port->open_wait, &wait);
	if (!tty_hung_up_p(filp))
		port->count++;
	port->blocked_open--;
	if (retval)
		return retval;
	port->flags |= ASYNC_NORMAL_ACTIVE;
464
465
466
	return 0;
}

467
static int mxser_set_baud(struct mxser_port *info, long newspd)
468
{
469
470
471
472
	int quot = 0;
	unsigned char cval;
	int ret = 0;
	unsigned long flags;
473

474
475
	if (!info->tty || !info->tty->termios)
		return ret;
476

477
478
	if (!(info->ioaddr))
		return ret;
479

480
481
	if (newspd > info->max_baud)
		return 0;
482

483
484
485
486
487
488
489
490
491
	info->realbaud = newspd;
	if (newspd == 134) {
		quot = (2 * info->baud_base / 269);
	} else if (newspd) {
		quot = info->baud_base / newspd;
		if (quot == 0)
			quot = 1;
	} else {
		quot = 0;
492
493
	}

494
495
	info->timeout = ((info->xmit_fifo_size * HZ * 10 * quot) / info->baud_base);
	info->timeout += HZ / 50;	/* Add .02 seconds of slop */
496

497
498
499
500
501
502
503
504
505
506
507
	if (quot) {
		spin_lock_irqsave(&info->slock, flags);
		info->MCR |= UART_MCR_DTR;
		outb(info->MCR, info->ioaddr + UART_MCR);
		spin_unlock_irqrestore(&info->slock, flags);
	} else {
		spin_lock_irqsave(&info->slock, flags);
		info->MCR &= ~UART_MCR_DTR;
		outb(info->MCR, info->ioaddr + UART_MCR);
		spin_unlock_irqrestore(&info->slock, flags);
		return ret;
508
509
	}

510
	cval = inb(info->ioaddr + UART_LCR);
511

512
	outb(cval | UART_LCR_DLAB, info->ioaddr + UART_LCR);	/* set DLAB */
513

514
515
516
	outb(quot & 0xff, info->ioaddr + UART_DLL);	/* LS of divisor */
	outb(quot >> 8, info->ioaddr + UART_DLM);	/* MS of divisor */
	outb(cval, info->ioaddr + UART_LCR);	/* reset DLAB */
517
518


519
520
	return ret;
}
521

522
523
524
525
526
527
528
529
530
531
532
533
/*
 * This routine is called to set the UART divisor registers to match
 * the specified baud rate for a serial port.
 */
static int mxser_change_speed(struct mxser_port *info,
		struct termios *old_termios)
{
	unsigned cflag, cval, fcr;
	int ret = 0;
	unsigned char status;
	long baud;
	unsigned long flags;
534

535
536
537
538
539
	if (!info->tty || !info->tty->termios)
		return ret;
	cflag = info->tty->termios->c_cflag;
	if (!(info->ioaddr))
		return ret;
540

541
542
543
544
	if (mxser_set_baud_method[info->tty->index] == 0) {
		baud = tty_get_baud_rate(info->tty);
		mxser_set_baud(info, baud);
	}
545

546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
	/* byte size and parity */
	switch (cflag & CSIZE) {
	case CS5:
		cval = 0x00;
		break;
	case CS6:
		cval = 0x01;
		break;
	case CS7:
		cval = 0x02;
		break;
	case CS8:
		cval = 0x03;
		break;
	default:
		cval = 0x00;
		break;		/* too keep GCC shut... */
	}
	if (cflag & CSTOPB)
		cval |= 0x04;
	if (cflag & PARENB)
		cval |= UART_LCR_PARITY;
	if (!(cflag & PARODD))
		cval |= UART_LCR_EPAR;
	if (cflag & CMSPAR)
		cval |= UART_LCR_SPAR;
572

573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
	if ((info->type == PORT_8250) || (info->type == PORT_16450)) {
		if (info->board->chip_flag) {
			fcr = UART_FCR_ENABLE_FIFO;
			fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
			SET_MOXA_MUST_FIFO_VALUE(info);
		} else
			fcr = 0;
	} else {
		fcr = UART_FCR_ENABLE_FIFO;
		if (info->board->chip_flag) {
			fcr |= MOXA_MUST_FCR_GDA_MODE_ENABLE;
			SET_MOXA_MUST_FIFO_VALUE(info);
		} else {
			switch (info->rx_trigger) {
			case 1:
				fcr |= UART_FCR_TRIGGER_1;
				break;
			case 4:
				fcr |= UART_FCR_TRIGGER_4;
				break;
			case 8:
				fcr |= UART_FCR_TRIGGER_8;
				break;
			default:
				fcr |= UART_FCR_TRIGGER_14;
				break;
			}
600
601
602
		}
	}

603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
	/* CTS flow control flag and modem status interrupts */
	info->IER &= ~UART_IER_MSI;
	info->MCR &= ~UART_MCR_AFE;
	if (cflag & CRTSCTS) {
		info->flags |= ASYNC_CTS_FLOW;
		info->IER |= UART_IER_MSI;
		if ((info->type == PORT_16550A) || (info->board->chip_flag)) {
			info->MCR |= UART_MCR_AFE;
		} else {
			status = inb(info->ioaddr + UART_MSR);
			if (info->tty->hw_stopped) {
				if (status & UART_MSR_CTS) {
					info->tty->hw_stopped = 0;
					if (info->type != PORT_16550A &&
							!info->board->chip_flag) {
						outb(info->IER & ~UART_IER_THRI,
							info->ioaddr +
							UART_IER);
						info->IER |= UART_IER_THRI;
						outb(info->IER, info->ioaddr +
								UART_IER);
					}
					set_bit(MXSER_EVENT_TXLOW, &info->event);
					schedule_work(&info->tqueue);				}
			} else {
				if (!(status & UART_MSR_CTS)) {
					info->tty->hw_stopped = 1;
					if ((info->type != PORT_16550A) &&
							(!info->board->chip_flag)) {
						info->IER &= ~UART_IER_THRI;
						outb(info->IER, info->ioaddr +
								UART_IER);
					}
				}
			}
		}
	} else {
		info->flags &= ~ASYNC_CTS_FLOW;
	}
	outb(info->MCR, info->ioaddr + UART_MCR);
	if (cflag & CLOCAL) {
		info->flags &= ~ASYNC_CHECK_CD;
	} else {
		info->flags |= ASYNC_CHECK_CD;
		info->IER |= UART_IER_MSI;
	}
	outb(info->IER, info->ioaddr + UART_IER);
650

651
652
653
654
655
656
657
658
	/*
	 * Set up parity check flag
	 */
	info->read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
	if (I_INPCK(info->tty))
		info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
	if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
		info->read_status_mask |= UART_LSR_BI;
659

660
	info->ignore_status_mask = 0;
661

662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
	if (I_IGNBRK(info->tty)) {
		info->ignore_status_mask |= UART_LSR_BI;
		info->read_status_mask |= UART_LSR_BI;
		/*
		 * If we're ignore parity and break indicators, ignore
		 * overruns too.  (For real raw support).
		 */
		if (I_IGNPAR(info->tty)) {
			info->ignore_status_mask |=
						UART_LSR_OE |
						UART_LSR_PE |
						UART_LSR_FE;
			info->read_status_mask |=
						UART_LSR_OE |
						UART_LSR_PE |
						UART_LSR_FE;
678
679
		}
	}
680
681
682
683
684
685
686
687
	if (info->board->chip_flag) {
		spin_lock_irqsave(&info->slock, flags);
		SET_MOXA_MUST_XON1_VALUE(info->ioaddr, START_CHAR(info->tty));
		SET_MOXA_MUST_XOFF1_VALUE(info->ioaddr, STOP_CHAR(info->tty));
		if (I_IXON(info->tty)) {
			ENABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
		} else {
			DISABLE_MOXA_MUST_RX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
688
		}
689
690
691
692
		if (I_IXOFF(info->tty)) {
			ENABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
		} else {
			DISABLE_MOXA_MUST_TX_SOFTWARE_FLOW_CONTROL(info->ioaddr);
693
		}
694
		spin_unlock_irqrestore(&info->slock, flags);
695
696
697
	}


698
699
	outb(fcr, info->ioaddr + UART_FCR);	/* set fcr */
	outb(cval, info->ioaddr + UART_LCR);
700

701
	return ret;
702
703
}

704
static void mxser_check_modem_status(struct mxser_port *port, int status)
705
{
706
707
708
709
710
711
712
713
714
715
716
	/* update input line counters */
	if (status & UART_MSR_TERI)
		port->icount.rng++;
	if (status & UART_MSR_DDSR)
		port->icount.dsr++;
	if (status & UART_MSR_DDCD)
		port->icount.dcd++;
	if (status & UART_MSR_DCTS)
		port->icount.cts++;
	port->mon_data.modem_status = status;
	wake_up_interruptible(&port->delta_msr_wait);
717

718
719
720
721
722
	if ((port->flags & ASYNC_CHECK_CD) && (status & UART_MSR_DDCD)) {
		if (status & UART_MSR_DCD)
			wake_up_interruptible(&port->open_wait);
		schedule_work(&port->tqueue);
	}
723

724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
	if (port->flags & ASYNC_CTS_FLOW) {
		if (port->tty->hw_stopped) {
			if (status & UART_MSR_CTS) {
				port->tty->hw_stopped = 0;

				if ((port->type != PORT_16550A) &&
						(!port->board->chip_flag)) {
					outb(port->IER & ~UART_IER_THRI,
						port->ioaddr + UART_IER);
					port->IER |= UART_IER_THRI;
					outb(port->IER, port->ioaddr +
							UART_IER);
				}
				set_bit(MXSER_EVENT_TXLOW, &port->event);
				schedule_work(&port->tqueue);
			}
		} else {
			if (!(status & UART_MSR_CTS)) {
				port->tty->hw_stopped = 1;
				if (port->type != PORT_16550A &&
						!port->board->chip_flag) {
					port->IER &= ~UART_IER_THRI;
					outb(port->IER, port->ioaddr +
							UART_IER);
				}
			}
		}
	}
752
753
}

754
static int mxser_startup(struct mxser_port *info)
755
{
756
757
	unsigned long page;
	unsigned long flags;
758

759
760
761
	page = __get_free_page(GFP_KERNEL);
	if (!page)
		return -ENOMEM;
762

763
	spin_lock_irqsave(&info->slock, flags);
764

765
766
767
768
769
	if (info->flags & ASYNC_INITIALIZED) {
		free_page(page);
		spin_unlock_irqrestore(&info->slock, flags);
		return 0;
	}
770

771
772
773
774
775
	if (!info->ioaddr || !info->type) {
		if (info->tty)
			set_bit(TTY_IO_ERROR, &info->tty->flags);
		free_page(page);
		spin_unlock_irqrestore(&info->slock, flags);
776
		return 0;
777
778
779
780
781
	}
	if (info->xmit_buf)
		free_page(page);
	else
		info->xmit_buf = (unsigned char *) page;
782
783

	/*
784
785
	 * Clear the FIFO buffers and disable them
	 * (they will be reenabled in mxser_change_speed())
786
	 */
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
	if (info->board->chip_flag)
		outb((UART_FCR_CLEAR_RCVR |
			UART_FCR_CLEAR_XMIT |
			MOXA_MUST_FCR_GDA_MODE_ENABLE), info->ioaddr + UART_FCR);
	else
		outb((UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
			info->ioaddr + UART_FCR);

	/*
	 * At this point there's no way the LSR could still be 0xFF;
	 * if it is, then bail out, because there's likely no UART
	 * here.
	 */
	if (inb(info->ioaddr + UART_LSR) == 0xff) {
		spin_unlock_irqrestore(&info->slock, flags);
		if (capable(CAP_SYS_ADMIN)) {
			if (info->tty)
				set_bit(TTY_IO_ERROR, &info->tty->flags);
			return 0;
		} else
			return -ENODEV;
	}

	/*
	 * Clear the interrupt registers.
	 */
	(void) inb(info->ioaddr + UART_LSR);
	(void) inb(info->ioaddr + UART_RX);
	(void) inb(info->ioaddr + UART_IIR);
	(void) inb(info->ioaddr + UART_MSR);

	/*
	 * Now, initialize the UART
	 */
	outb(UART_LCR_WLEN8, info->ioaddr + UART_LCR);	/* reset DLAB */
	info->MCR = UART_MCR_DTR | UART_MCR_RTS;
	outb(info->MCR, info->ioaddr + UART_MCR);

	/*
	 * Finally, enable interrupts
	 */
	info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI;

	if (info->board->chip_flag)
		info->IER |= MOXA_MUST_IER_EGDAI;
	outb(info->IER, info->ioaddr + UART_IER);	/* enable interrupts */

	/*
	 * And clear the interrupt registers again for luck.
	 */
	(void) inb(info->ioaddr + UART_LSR);
	(void) inb(info->ioaddr + UART_RX);
	(void) inb(info->ioaddr + UART_IIR);
	(void) inb(info->ioaddr + UART_MSR);

	if (info->tty)
		clear_bit(TTY_IO_ERROR, &info->tty->flags);
	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;

	/*
	 * and set the speed of the serial port
	 */
	spin_unlock_irqrestore(&info->slock, flags);
	mxser_change_speed(info, NULL);

	info->flags |= ASYNC_INITIALIZED;
	return 0;
}

/*
 * This routine will shutdown a serial port; interrupts maybe disabled, and
 * DTR is dropped if the hangup on close termio flag is on.
 */
static void mxser_shutdown(struct mxser_port *info)
{
	unsigned long flags;

	if (!(info->flags & ASYNC_INITIALIZED))
		return;

	spin_lock_irqsave(&info->slock, flags);

	/*
	 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
	 * here so the queue might never be waken up
	 */
	wake_up_interruptible(&info->delta_msr_wait);

	/*
	 * Free the IRQ, if necessary
	 */
	if (info->xmit_buf) {
		free_page((unsigned long) info->xmit_buf);
		info->xmit_buf = NULL;
	}

	info->IER = 0;
	outb(0x00, info->ioaddr + UART_IER);

	if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
		info->MCR &= ~(UART_MCR_DTR | UART_MCR_RTS);
	outb(info->MCR, info->ioaddr + UART_MCR);

	/* clear Rx/Tx FIFO's */
	if (info->board->chip_flag)
		outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT |
				MOXA_MUST_FCR_GDA_MODE_ENABLE,
				info->ioaddr + UART_FCR);
	else
		outb(UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT,
			info->ioaddr + UART_FCR);

	/* read data port to reset things */
	(void) inb(info->ioaddr + UART_RX);

	if (info->tty)
		set_bit(TTY_IO_ERROR, &info->tty->flags);

	info->flags &= ~ASYNC_INITIALIZED;

	if (info->board->chip_flag)
		SET_MOXA_MUST_NO_SOFTWARE_FLOW_CONTROL(info->ioaddr);

	spin_unlock_irqrestore(&info->slock, flags);
}

/*
 * This routine is called whenever a serial port is opened.  It
 * enables interrupts for a serial port, linking in its async structure into
 * the IRQ chain.   It also performs the serial-specific
 * initialization for the tty structure.
 */
static int mxser_open(struct tty_struct *tty, struct file *filp)
{
	struct mxser_port *info;
	int retval, line;

	/* initialize driver_data in case something fails */
	tty->driver_data = NULL;

	line = tty->index;
	if (line == MXSER_PORTS)
		return 0;
	if (line < 0 || line > MXSER_PORTS)
		return -ENODEV;
	info = &mxser_boards[line / MXSER_PORTS_PER_BOARD].ports[line % MXSER_PORTS_PER_BOARD];
	if (!info->ioaddr)
		return -ENODEV;

	tty->driver_data = info;
	info->tty = tty;
	/*
	 * Start up serial port
	 */
	info->count++;
	retval = mxser_startup(info);
	if (retval)
		return retval;

	retval = mxser_block_til_ready(tty, filp, info);
	if (retval)
		return retval;

	if ((info->count == 1) && (info->flags & ASYNC_SPLIT_TERMIOS)) {
951
952
953
954
955
956
957
		if (tty->driver->subtype == SERIAL_TYPE_NORMAL)
			*tty->termios = info->normal_termios;
		else
			*tty->termios = info->callout_termios;
		mxser_change_speed(info, NULL);
	}

958
	info->session = process_session(current);
959
960
	info->pgrp = process_group(current);

961
	/* unmark here for very high baud rate (ex. 921600 bps) used */
962
963
964
965
966
967
968
969
970
971
972
973
	tty->low_latency = 1;
	return 0;
}

/*
 * This routine is called when the serial port gets closed.  First, we
 * wait for the last remaining data to be sent.  Then, we unlink its
 * async structure from the interrupt chain if necessary, and we free
 * that IRQ if nothing is left in the chain.
 */
static void mxser_close(struct tty_struct *tty, struct file *filp)
{
974
	struct mxser_port *info = tty->driver_data;
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003

	unsigned long timeout;
	unsigned long flags;

	if (tty->index == MXSER_PORTS)
		return;
	if (!info)
		return;

	spin_lock_irqsave(&info->slock, flags);

	if (tty_hung_up_p(filp)) {
		spin_unlock_irqrestore(&info->slock, flags);
		return;
	}
	if ((tty->count == 1) && (info->count != 1)) {
		/*
		 * Uh, oh.  tty->count is 1, which means that the tty
		 * structure will be freed.  Info->count should always
		 * be one in these conditions.  If it's greater than
		 * one, we've got real problems, since it means the
		 * serial port won't be shutdown.
		 */
		printk(KERN_ERR "mxser_close: bad serial port count; "
			"tty->count is 1, info->count is %d\n", info->count);
		info->count = 1;
	}
	if (--info->count < 0) {
		printk(KERN_ERR "mxser_close: bad serial port count for "
1004
			"ttys%d: %d\n", tty->index, info->count);
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
		info->count = 0;
	}
	if (info->count) {
		spin_unlock_irqrestore(&info->slock, flags);
		return;
	}
	info->flags |= ASYNC_CLOSING;
	spin_unlock_irqrestore(&info->slock, flags);
	/*
	 * Save the termios structure, since this port may have
	 * separate termios for callout and dialin.
	 */
	if (info->flags & ASYNC_NORMAL_ACTIVE)
		info->normal_termios = *tty->termios;
	/*
	 * Now we wait for the transmit buffer to clear; and we notify
	 * the line discipline to only process XON/XOFF characters.
	 */
	tty->closing = 1;
	if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
		tty_wait_until_sent(tty, info->closing_wait);
	/*
	 * At this point we stop accepting input.  To do this, we
	 * disable the receive line status interrupts, and tell the
	 * interrupt driver to stop checking the data ready bit in the
	 * line status register.
	 */
	info->IER &= ~UART_IER_RLSI;
1033
	if (info->board->chip_flag)
1034
		info->IER &= ~MOXA_MUST_RECV_ISR;
1035

1036
	if (info->flags & ASYNC_INITIALIZED) {
1037
		outb(info->IER, info->ioaddr + UART_IER);
1038
1039
1040
1041
1042
1043
		/*
		 * Before we drop DTR, make sure the UART transmitter
		 * has completely drained; this is especially
		 * important if there is a transmit FIFO!
		 */
		timeout = jiffies + HZ;
1044
		while (!(inb(info->ioaddr + UART_LSR) & UART_LSR_TEMT)) {
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
			schedule_timeout_interruptible(5);
			if (time_after(jiffies, timeout))
				break;
		}
	}
	mxser_shutdown(info);

	if (tty->driver->flush_buffer)
		tty->driver->flush_buffer(tty);

1055
	tty_ldisc_flush(tty);
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073

	tty->closing = 0;
	info->event = 0;
	info->tty = NULL;
	if (info->blocked_open) {
		if (info->close_delay)
			schedule_timeout_interruptible(info->close_delay);
		wake_up_interruptible(&info->open_wait);
	}

	info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
	wake_up_interruptible(&info->close_wait);

}

static int mxser_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
	int c, total = 0;
1074
	struct mxser_port *info = tty->driver_data;
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
	unsigned long flags;

	if (!info->xmit_buf)
		return 0;

	while (1) {
		c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
					  SERIAL_XMIT_SIZE - info->xmit_head));
		if (c <= 0)
			break;

		memcpy(info->xmit_buf + info->xmit_head, buf, c);
		spin_lock_irqsave(&info->slock, flags);
		info->xmit_head = (info->xmit_head + c) &
				  (SERIAL_XMIT_SIZE - 1);
		info->xmit_cnt += c;
		spin_unlock_irqrestore(&info->slock, flags);

		buf += c;
		count -= c;
		total += c;
	}

1098
	if (info->xmit_cnt && !tty->stopped) {
1099
1100
		if (!tty->hw_stopped ||
				(info->type == PORT_16550A) ||
1101
				(info->board->chip_flag)) {
1102
			spin_lock_irqsave(&info->slock, flags);
1103
1104
			outb(info->IER & ~UART_IER_THRI, info->ioaddr +
					UART_IER);
1105
			info->IER |= UART_IER_THRI;
1106
			outb(info->IER, info->ioaddr + UART_IER);
1107
1108
1109
1110
1111
1112
1113
1114
			spin_unlock_irqrestore(&info->slock, flags);
		}
	}
	return total;
}

static void mxser_put_char(struct tty_struct *tty, unsigned char ch)
{
1115
	struct mxser_port *info = tty->driver_data;
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
	unsigned long flags;

	if (!info->xmit_buf)
		return;

	if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
		return;

	spin_lock_irqsave(&info->slock, flags);
	info->xmit_buf[info->xmit_head++] = ch;
	info->xmit_head &= SERIAL_XMIT_SIZE - 1;
	info->xmit_cnt++;
	spin_unlock_irqrestore(&info->slock, flags);
1129
	if (!tty->stopped) {
1130
1131
		if (!tty->hw_stopped ||
				(info->type == PORT_16550A) ||
1132
				info->board->chip_flag) {
1133
			spin_lock_irqsave(&info->slock, flags);
1134
			outb(info->IER & ~UART_IER_THRI, info->ioaddr + UART_IER);
1135
			info->IER |= UART_IER_THRI;
1136
			outb(info->IER, info->ioaddr + UART_IER);
1137
1138
1139
1140
1141
1142
1143
1144
			spin_unlock_irqrestore(&info->slock, flags);
		}
	}
}


static void mxser_flush_chars(struct tty_struct *tty)
{
1145
	struct mxser_port *info = tty->driver_data;
1146
1147
1148
1149
1150
1151
1152
	unsigned long flags;

	if (info->xmit_cnt <= 0 ||
			tty->stopped ||
			!info->xmit_buf ||
			(tty->hw_stopped &&
			 (info->type != PORT_16550A) &&
1153
			 (!info->board->chip_flag)
1154
1155
1156
1157
1158
			))
		return;

	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
1163
1164
1165
1166
1167

	spin_unlock_irqrestore(&info->slock, flags);
}

static int mxser_write_room(struct tty_struct *tty)
{
1168
	struct mxser_port *info = tty->driver_data;
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
	int ret;

	ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
	if (ret < 0)
		ret = 0;
	return ret;
}

static int mxser_chars_in_buffer(struct tty_struct *tty)
{
1179
	struct mxser_port *info = tty->driver_data;
1180
	return info->xmit_cnt;
1181
1182
1183
1184
}

static void mxser_flush_buffer(struct tty_struct *tty)
{
1185
	struct mxser_port *info = tty->driver_data;
1186
1187
1188
1189
1190
1191
1192
	char fcr;
	unsigned long flags;


	spin_lock_irqsave(&info->slock, flags);
	info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;

1193
	fcr = inb(info->ioaddr + UART_FCR);
1194
	outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
1195
1196
		info->ioaddr + UART_FCR);
	outb(fcr, info->ioaddr + UART_FCR);
1197
1198
1199

	spin_unlock_irqrestore(&info->slock, flags);

1200
	tty_wakeup(tty);
1201
1202
}

1203
1204
1205
1206
1207
1208
1209
/*
 * ------------------------------------------------------------
 * friends of mxser_ioctl()
 * ------------------------------------------------------------
 */
static int mxser_get_serial_info(struct mxser_port *info,
		struct serial_struct __user *retinfo)
1210
{
1211
	struct serial_struct tmp;
1212

1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
	if (!retinfo)
		return -EFAULT;
	memset(&tmp, 0, sizeof(tmp));
	tmp.type = info->type;
	tmp.line = info->tty->index;
	tmp.port = info->ioaddr;
	tmp.irq = info->board->irq;
	tmp.flags = info->flags;
	tmp.baud_base = info->baud_base;
	tmp.close_delay = info->close_delay;
	tmp.closing_wait = info->closing_wait;
	tmp.custom_divisor = info->custom_divisor;
	tmp.hub6 = 0;
	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
		return -EFAULT;
	return 0;
}
1230

1231
1232
1233
1234
1235
1236
static int mxser_set_serial_info(struct mxser_port *info,
		struct serial_struct __user *new_info)
{
	struct serial_struct new_serial;
	unsigned int flags;
	int retval = 0;
1237

1238
1239
1240
1241
	if (!new_info || !info->ioaddr)
		return -EFAULT;
	if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
		return -EFAULT;
1242

1243
1244
1245
1246
1247
	if ((new_serial.irq != info->board->irq) ||
			(new_serial.port != info->ioaddr) ||
			(new_serial.custom_divisor != info->custom_divisor) ||
			(new_serial.baud_base != info->baud_base))
		return -EPERM;
1248

1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
	flags = info->flags & ASYNC_SPD_MASK;

	if (!capable(CAP_SYS_ADMIN)) {
		if ((new_serial.baud_base != info->baud_base) ||
				(new_serial.close_delay != info->close_delay) ||
				((new_serial.flags & ~ASYNC_USR_MASK) != (info->flags & ~ASYNC_USR_MASK)))
			return -EPERM;
		info->flags = ((info->flags & ~ASYNC_USR_MASK) |
				(new_serial.flags & ASYNC_USR_MASK));
	} else {
1259
		/*
1260
1261
		 * OK, past this point, all the error checking has been done.
		 * At this point, we start making changes.....
1262
		 */
1263
1264
1265
1266
1267
1268
		info->flags = ((info->flags & ~ASYNC_FLAGS) |
				(new_serial.flags & ASYNC_FLAGS));
		info->close_delay = new_serial.close_delay * HZ / 100;
		info->closing_wait = new_serial.closing_wait * HZ / 100;
		info->tty->low_latency =
				(info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1269
		info->tty->low_latency = 0;
1270
	}
1271

1272
	info->type = new_serial.type;
1273

1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
	process_txrx_fifo(info);

	if (info->flags & ASYNC_INITIALIZED) {
		if (flags != (info->flags & ASYNC_SPD_MASK))
			mxser_change_speed(info, NULL);
	} else
		retval = mxser_startup(info);

	return retval;
}
1284

1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
/*
 * mxser_get_lsr_info - get line status register info
 *
 * Purpose: Let user call ioctl() to get info when the UART physically
 *	    is emptied.  On bus types like RS485, the transmitter must
 *	    release the bus after transmitting. This must be done when
 *	    the transmit shift register is empty, not be done when the
 *	    transmit holding register is empty.  This functionality
 *	    allows an RS485 driver to be written in user space.
 */
static int mxser_get_lsr_info(struct mxser_port *info,
		unsigned int __user *value)
{
	unsigned char status;
	unsigned int result;
	unsigned long flags;
1301

1302
1303
1304
1305
1306
1307
	spin_lock_irqsave(&info->slock, flags);
	status = inb(info->ioaddr + UART_LSR);
	spin_unlock_irqrestore(&info->slock, flags);
	result = ((status & UART_LSR_TEMT) ? TIOCSER_TEMT : 0);
	return put_user(result, value);
}
1308

1309
1310
1311
1312
1313
1314
/*
 * This routine sends a break character out the serial port.
 */
static void mxser_send_break(struct mxser_port *info, int duration)
{
	unsigned long flags;
1315

1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
	if (!info->ioaddr)
		return;
	set_current_state(TASK_INTERRUPTIBLE);
	spin_lock_irqsave(&info->slock, flags);
	outb(inb(info->ioaddr + UART_LCR) | UART_LCR_SBC,
		info->ioaddr + UART_LCR);
	spin_unlock_irqrestore(&info->slock, flags);
	schedule_timeout(duration);
	spin_lock_irqsave(&info->slock, flags);
	outb(inb(info->ioaddr + UART_LCR) & ~UART_LCR_SBC,
		info->ioaddr + UART_LCR);
	spin_unlock_irqrestore(&info->slock, flags);
}
1329

1330
1331
1332
1333
1334
static int mxser_tiocmget(struct tty_struct *tty, struct file *file)
{
	struct mxser_port *info = tty->driver_data;
	unsigned char control, status;
	unsigned long flags;
1335
1336


1337
1338
	if (tty->index == MXSER_PORTS)
		return -ENOIOCTLCMD;
1339
	if (test_bit(TTY_IO_ERROR, &tty->flags))
1340
		return -EIO;
1341

1342
	control = info->MCR;
1343

1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
	spin_lock_irqsave(&info->slock, flags);
	status = inb(info->ioaddr + UART_MSR);
	if (status & UART_MSR_ANY_DELTA)
		mxser_check_modem_status(info, status);
	spin_unlock_irqrestore(&info->slock, flags);
	return ((control & UART_MCR_RTS) ? TIOCM_RTS : 0) |
		    ((control & UART_MCR_DTR) ? TIOCM_DTR : 0) |
		    ((status & UART_MSR_DCD) ? TIOCM_CAR : 0) |
		    ((status & UART_MSR_RI) ? TIOCM_RNG : 0) |
		    ((status & UART_MSR_DSR) ? TIOCM_DSR : 0) |
		    ((status & UART_MSR_CTS) ? TIOCM_CTS : 0);
}
1356

1357
1358
1359
1360
1361
static int mxser_tiocmset(struct tty_struct *tty, struct file *file,
		unsigned int set, unsigned int clear)
{
	struct mxser_port *info = tty->driver_data;
	unsigned long flags;
1362
1363


1364
1365
	if (tty->index == MXSER_PORTS)
		return -ENOIOCTLCMD;
1366
	if (test_bit(TTY_IO_ERROR, &tty->flags))
1367
		return -EIO;
1368

1369
	spin_lock_irqsave(&info->slock, flags);
1370

1371
1372
1373
1374
	if (set & TIOCM_RTS)
		info->MCR |= UART_MCR_RTS;
	if (set & TIOCM_DTR)
		info->MCR |= UART_MCR_DTR;
1375

1376
1377
1378
1379
	if (clear & TIOCM_RTS)
		info->MCR &= ~UART_MCR_RTS;
	if (clear & TIOCM_DTR)
		info->MCR &= ~UART_MCR_DTR;
1380

1381
1382
	outb(info->MCR, info->ioaddr + UART_MCR);
	spin_unlock_irqrestore(&info->slock, flags);
1383
1384
1385
	return 0;
}

1386
static int mxser_program_mode(int port)
1387
{
1388
	int id, i, j, n;
1389

1390
1391
1392
1393
1394
1395
1396
1397
1398
	spin_lock(&gm_lock);
	outb(0, port);
	outb(0, port);
	outb(0, port);
	(void)inb(port);
	(void)inb(port);
	outb(0, port);
	(void)inb(port);
	spin_unlock(&gm_lock);
1399

1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
	id = inb(port + 1) & 0x1F;
	if ((id != C168_ASIC_ID) &&
			(id != C104_ASIC_ID) &&
			(id != C102_ASIC_ID) &&
			(id != CI132_ASIC_ID) &&
			(id != CI134_ASIC_ID) &&
			(id != CI104J_ASIC_ID))
		return -1;
	for (i = 0, j = 0; i < 4; i++) {
		n = inb(port + 2);
		if (n == 'M') {
			j = 1;
		} else if ((j == 1) && (n == 1)) {
			j = 2;
			break;
		} else
			j = 0;
	}
	if (j != 2)
		id = -2;
	return id;
}

static void mxser_normal_mode(int port)
{
	int i, n;

	outb(0xA5, port + 1);
	outb(0x80, port + 3);
	outb(12, port + 0);	/* 9600 bps */
	outb(0, port + 1);
	outb(0x03, port + 3);	/* 8 data bits */
	outb(0x13, port + 4);	/* loop back mode */
	for (i = 0; i < 16; i++) {
		n = inb(port + 5);
		if ((n & 0x61) == 0x60)
			break;
		if ((n & 1) == 1)
			(void)inb(port);
	}
	outb(0x00, port + 4);
}

#define CHIP_SK 	0x01	/* Serial Data Clock  in Eprom */
#define CHIP_DO 	0x02	/* Serial Data Output in Eprom */
#define CHIP_CS 	0x04	/* Serial Chip Select in Eprom */
#define CHIP_DI 	0x08	/* Serial Data Input  in Eprom */
#define EN_CCMD 	0x000	/* Chip's command register     */
#define EN0_RSARLO	0x008	/* Remote start address reg 0  */
#define EN0_RSARHI	0x009	/* Remote start address reg 1  */
#define EN0_RCNTLO	0x00A	/* Remote byte count reg WR    */
#define EN0_RCNTHI	0x00B	/* Remote byte count reg WR    */
#define EN0_DCFG	0x00E	/* Data configuration reg WR   */
#define EN0_PORT	0x010	/* Rcv missed frame error counter RD */
#define ENC_PAGE0	0x000	/* Select page 0 of chip registers   */
#define ENC_PAGE3	0x0C0	/* Select page 3 of chip registers   */
static int mxser_read_register(int port, unsigned short *regs)
{
	int i, k, value, id;
	unsigned int j;

	id = mxser_program_mode(port);
	if (id < 0)
		return id;
	for (i = 0; i < 14; i++) {
		k = (i & 0x3F) | 0x180;
		for (j = 0x100; j > 0; j >>= 1) {
			outb(CHIP_CS, port);
			if (k & j) {
				outb(CHIP_CS | CHIP_DO, port);
				outb(CHIP_CS | CHIP_DO | CHIP_SK, port);	/* A? bit of read */
			} else {
				outb(CHIP_CS, port);
				outb(CHIP_CS | CHIP_SK, port);	/* A? bit of read */
			}
		}
		(void)inb(port);
		value = 0;
		for (k = 0, j = 0x8000; k < 16; k++, j >>= 1) {
			outb(CHIP_CS, port);
			outb(CHIP_CS | CHIP_SK, port);
			if (inb(port) & CHIP_DI)
				value |= j;
		}
		regs[i] = value;
		outb(0, port);
	}
	mxser_normal_mode(port);
	return id;
}

static int mxser_ioctl_special(unsigned int cmd, void __user *argp)
{
	struct mxser_port *port;
	int result, status;
	unsigned int i, j;

	switch (cmd) {
	case MOXA_GET_CONF:
/*		if (copy_to_user(argp, mxsercfg,
				sizeof(struct mxser_hwconf) * 4))
			return -EFAULT;
		return 0;*/
		return -ENXIO;
	case MOXA_GET_MAJOR:
		if (copy_to_user(argp, &ttymajor, sizeof(int)))
			return -EFAULT;
		return 0;

	case MOXA_GET_CUMAJOR:
		if (copy_to_user(argp, &calloutmajor, sizeof(int)))
1511
1512
1513
1514
1515
			return -EFAULT;
		return 0;

	case MOXA_CHKPORTENABLE:
		result = 0;
1516
1517
1518
1519
1520
1521

		for (i = 0; i < MXSER_BOARDS; i++)
			for (j = 0; j < MXSER_PORTS_PER_BOARD; j++)
				if (mxser_boards[i].ports[j].ioaddr)
					result |= (1 << i);

1522