summaryrefslogtreecommitdiffstats
path: root/drivers/serial/sa1100.c
blob: 94530f01521e6dffbc466909d8a5c332f5e81c32 (plain)
1
2
3
4
5
6
7
8
9
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
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
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
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
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
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
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
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
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
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
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
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
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
/*
 *  linux/drivers/char/sa1100.c
 *
 *  Driver for SA11x0 serial ports
 *
 *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
 *
 *  Copyright (C) 2000 Deep Blue Solutions Ltd.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#if defined(CONFIG_SERIAL_SA1100_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif

#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/platform_device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/io.h>

#include <asm/irq.h>
#include <mach/hardware.h>
#include <asm/mach/serial_sa1100.h>

/* We've been assigned a range on the "Low-density serial ports" major */
#define SERIAL_SA1100_MAJOR	204
#define MINOR_START		5

#define NR_PORTS		3

#define SA1100_ISR_PASS_LIMIT	256

/*
 * Convert from ignore_status_mask or read_status_mask to UTSR[01]
 */
#define SM_TO_UTSR0(x)	((x) & 0xff)
#define SM_TO_UTSR1(x)	((x) >> 8)
#define UTSR0_TO_SM(x)	((x))
#define UTSR1_TO_SM(x)	((x) << 8)

#define UART_GET_UTCR0(sport)	__raw_readl((sport)->port.membase + UTCR0)
#define UART_GET_UTCR1(sport)	__raw_readl((sport)->port.membase + UTCR1)
#define UART_GET_UTCR2(sport)	__raw_readl((sport)->port.membase + UTCR2)
#define UART_GET_UTCR3(sport)	__raw_readl((sport)->port.membase + UTCR3)
#define UART_GET_UTSR0(sport)	__raw_readl((sport)->port.membase + UTSR0)
#define UART_GET_UTSR1(sport)	__raw_readl((sport)->port.membase + UTSR1)
#define UART_GET_CHAR(sport)	__raw_readl((sport)->port.membase + UTDR)

#define UART_PUT_UTCR0(sport,v)	__raw_writel((v),(sport)->port.membase + UTCR0)
#define UART_PUT_UTCR1(sport,v)	__raw_writel((v),(sport)->port.membase + UTCR1)
#define UART_PUT_UTCR2(sport,v)	__raw_writel((v),(sport)->port.membase + UTCR2)
#define UART_PUT_UTCR3(sport,v)	__raw_writel((v),(sport)->port.membase + UTCR3)
#define UART_PUT_UTSR0(sport,v)	__raw_writel((v),(sport)->port.membase + UTSR0)
#define UART_PUT_UTSR1(sport,v)	__raw_writel((v),(sport)->port.membase + UTSR1)
#define UART_PUT_CHAR(sport,v)	__raw_writel((v),(sport)->port.membase + UTDR)

/*
 * This is the size of our serial port register set.
 */
#define UART_PORT_SIZE	0x24

/*
 * This determines how often we check the modem status signals
 * for any change.  They generally aren't connected to an IRQ
 * so we have to poll them.  We also check immediately before
 * filling the TX fifo incase CTS has been dropped.
 */
#define MCTRL_TIMEOUT	(250*HZ/1000)

struct sa1100_port {
	struct uart_port	port;
	struct timer_list	timer;
	unsigned int		old_status;
};

/*
 * Handle any change of modem status signal since we were last called.
 */
static void sa1100_mctrl_check(struct sa1100_port *sport)
{
	unsigned int status, changed;

	status = sport->port.ops->get_mctrl(&sport->port);
	changed = status ^ sport->old_status;

	if (changed == 0)
		return;

	sport->old_status = status;

	if (changed & TIOCM_RI)
		sport->port.icount.rng++;
	if (changed & TIOCM_DSR)
		sport->port.icount.dsr++;
	if (changed & TIOCM_CAR)
		uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
	if (changed & TIOCM_CTS)
		uart_handle_cts_change(&sport->port, status & TIOCM_CTS);

	wake_up_interruptible(&sport->port.info->delta_msr_wait);
}

/*
 * This is our per-port timeout handler, for checking the
 * modem status signals.
 */
static void sa1100_timeout(unsigned long data)
{
	struct sa1100_port *sport = (struct sa1100_port *)data;
	unsigned long flags;

	if (sport->port.info) {
		spin_lock_irqsave(&sport->port.lock, flags);
		sa1100_mctrl_check(sport);
		spin_unlock_irqrestore(&sport->port.lock, flags);

		mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
	}
}

/*
 * interrupts disabled on entry
 */
static void sa1100_stop_tx(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;
	u32 utcr3;

	utcr3 = UART_GET_UTCR3(sport);
	UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_TIE);
	sport->port.read_status_mask &= ~UTSR0_TO_SM(UTSR0_TFS);
}

/*
 * port locked and interrupts disabled
 */
static void sa1100_start_tx(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;
	u32 utcr3;

	utcr3 = UART_GET_UTCR3(sport);
	sport->port.read_status_mask |= UTSR0_TO_SM(UTSR0_TFS);
	UART_PUT_UTCR3(sport, utcr3 | UTCR3_TIE);
}

/*
 * Interrupts enabled
 */
static void sa1100_stop_rx(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;
	u32 utcr3;

	utcr3 = UART_GET_UTCR3(sport);
	UART_PUT_UTCR3(sport, utcr3 & ~UTCR3_RIE);
}

/*
 * Set the modem control timer to fire immediately.
 */
static void sa1100_enable_ms(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;

	mod_timer(&sport->timer, jiffies);
}

static void
sa1100_rx_chars(struct sa1100_port *sport)
{
	struct tty_struct *tty = sport->port.info->port.tty;
	unsigned int status, ch, flg;

	status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
		 UTSR0_TO_SM(UART_GET_UTSR0(sport));
	while (status & UTSR1_TO_SM(UTSR1_RNE)) {
		ch = UART_GET_CHAR(sport);

		sport->port.icount.rx++;

		flg = TTY_NORMAL;

		/*
		 * note that the error handling code is
		 * out of the main execution path
		 */
		if (status & UTSR1_TO_SM(UTSR1_PRE | UTSR1_FRE | UTSR1_ROR)) {
			if (status & UTSR1_TO_SM(UTSR1_PRE))
				sport->port.icount.parity++;
			else if (status & UTSR1_TO_SM(UTSR1_FRE))
				sport->port.icount.frame++;
			if (status & UTSR1_TO_SM(UTSR1_ROR))
				sport->port.icount.overrun++;

			status &= sport->port.read_status_mask;

			if (status & UTSR1_TO_SM(UTSR1_PRE))
				flg = TTY_PARITY;
			else if (status & UTSR1_TO_SM(UTSR1_FRE))
				flg = TTY_FRAME;

#ifdef SUPPORT_SYSRQ
			sport->port.sysrq = 0;
#endif
		}

		if (uart_handle_sysrq_char(&sport->port, ch))
			goto ignore_char;

		uart_insert_char(&sport->port, status, UTSR1_TO_SM(UTSR1_ROR), ch, flg);

	ignore_char:
		status = UTSR1_TO_SM(UART_GET_UTSR1(sport)) |
			 UTSR0_TO_SM(UART_GET_UTSR0(sport));
	}
	tty_flip_buffer_push(tty);
}

static void sa1100_tx_chars(struct sa1100_port *sport)
{
	struct circ_buf *xmit = &sport->port.info->xmit;

	if (sport->port.x_char) {
		UART_PUT_CHAR(sport, sport->port.x_char);
		sport->port.icount.tx++;
		sport->port.x_char = 0;
		return;
	}

	/*
	 * Check the modem control lines before
	 * transmitting anything.
	 */
	sa1100_mctrl_check(sport);

	if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
		sa1100_stop_tx(&sport->port);
		return;
	}

	/*
	 * Tried using FIFO (not checking TNF) for fifo fill:
	 * still had the '4 bytes repeated' problem.
	 */
	while (UART_GET_UTSR1(sport) & UTSR1_TNF) {
		UART_PUT_CHAR(sport, xmit->buf[xmit->tail]);
		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
		sport->port.icount.tx++;
		if (uart_circ_empty(xmit))
			break;
	}

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(&sport->port);

	if (uart_circ_empty(xmit))
		sa1100_stop_tx(&sport->port);
}

static irqreturn_t sa1100_int(int irq, void *dev_id)
{
	struct sa1100_port *sport = dev_id;
	unsigned int status, pass_counter = 0;

	spin_lock(&sport->port.lock);
	status = UART_GET_UTSR0(sport);
	status &= SM_TO_UTSR0(sport->port.read_status_mask) | ~UTSR0_TFS;
	do {
		if (status & (UTSR0_RFS | UTSR0_RID)) {
			/* Clear the receiver idle bit, if set */
			if (status & UTSR0_RID)
				UART_PUT_UTSR0(sport, UTSR0_RID);
			sa1100_rx_chars(sport);
		}

		/* Clear the relevant break bits */
		if (status & (UTSR0_RBB | UTSR0_REB))
			UART_PUT_UTSR0(sport, status & (UTSR0_RBB | UTSR0_REB));

		if (status & UTSR0_RBB)
			sport->port.icount.brk++;

		if (status & UTSR0_REB)
			uart_handle_break(&sport->port);

		if (status & UTSR0_TFS)
			sa1100_tx_chars(sport);
		if (pass_counter++ > SA1100_ISR_PASS_LIMIT)
			break;
		status = UART_GET_UTSR0(sport);
		status &= SM_TO_UTSR0(sport->port.read_status_mask) |
			  ~UTSR0_TFS;
	} while (status & (UTSR0_TFS | UTSR0_RFS | UTSR0_RID));
	spin_unlock(&sport->port.lock);

	return IRQ_HANDLED;
}

/*
 * Return TIOCSER_TEMT when transmitter is not busy.
 */
static unsigned int sa1100_tx_empty(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;

	return UART_GET_UTSR1(sport) & UTSR1_TBY ? 0 : TIOCSER_TEMT;
}

static unsigned int sa1100_get_mctrl(struct uart_port *port)
{
	return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
}

static void sa1100_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
}

/*
 * Interrupts always disabled.
 */
static void sa1100_break_ctl(struct uart_port *port, int break_state)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;
	unsigned long flags;
	unsigned int utcr3;

	spin_lock_irqsave(&sport->port.lock, flags);
	utcr3 = UART_GET_UTCR3(sport);
	if (break_state == -1)
		utcr3 |= UTCR3_BRK;
	else
		utcr3 &= ~UTCR3_BRK;
	UART_PUT_UTCR3(sport, utcr3);
	spin_unlock_irqrestore(&sport->port.lock, flags);
}

static int sa1100_startup(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;
	int retval;

	/*
	 * Allocate the IRQ
	 */
	retval = request_irq(sport->port.irq, sa1100_int, 0,
			     "sa11x0-uart", sport);
	if (retval)
		return retval;

	/*
	 * Finally, clear and enable interrupts
	 */
	UART_PUT_UTSR0(sport, -1);
	UART_PUT_UTCR3(sport, UTCR3_RXE | UTCR3_TXE | UTCR3_RIE);

	/*
	 * Enable modem status interrupts
	 */
	spin_lock_irq(&sport->port.lock);
	sa1100_enable_ms(&sport->port);
	spin_unlock_irq(&sport->port.lock);

	return 0;
}

static void sa1100_shutdown(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;

	/*
	 * Stop our timer.
	 */
	del_timer_sync(&sport->timer);

	/*
	 * Free the interrupt
	 */
	free_irq(sport->port.irq, sport);

	/*
	 * Disable all interrupts, port and break condition.
	 */
	UART_PUT_UTCR3(sport, 0);
}

static void
sa1100_set_termios(struct uart_port *port, struct ktermios *termios,
		   struct ktermios *old)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;
	unsigned long flags;
	unsigned int utcr0, old_utcr3, baud, quot;
	unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;

	/*
	 * We only support CS7 and CS8.
	 */
	while ((termios->c_cflag & CSIZE) != CS7 &&
	       (termios->c_cflag & CSIZE) != CS8) {
		termios->c_cflag &= ~CSIZE;
		termios->c_cflag |= old_csize;
		old_csize = CS8;
	}

	if ((termios->c_cflag & CSIZE) == CS8)
		utcr0 = UTCR0_DSS;
	else
		utcr0 = 0;

	if (termios->c_cflag & CSTOPB)
		utcr0 |= UTCR0_SBS;
	if (termios->c_cflag & PARENB) {
		utcr0 |= UTCR0_PE;
		if (!(termios->c_cflag & PARODD))
			utcr0 |= UTCR0_OES;
	}

	/*
	 * Ask the core to calculate the divisor for us.
	 */
	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16); 
	quot = uart_get_divisor(port, baud);

	spin_lock_irqsave(&sport->port.lock, flags);

	sport->port.read_status_mask &= UTSR0_TO_SM(UTSR0_TFS);
	sport->port.read_status_mask |= UTSR1_TO_SM(UTSR1_ROR);
	if (termios->c_iflag & INPCK)
		sport->port.read_status_mask |=
				UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
	if (termios->c_iflag & (BRKINT | PARMRK))
		sport->port.read_status_mask |=
				UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);

	/*
	 * Characters to ignore
	 */
	sport->port.ignore_status_mask = 0;
	if (termios->c_iflag & IGNPAR)
		sport->port.ignore_status_mask |=
				UTSR1_TO_SM(UTSR1_FRE | UTSR1_PRE);
	if (termios->c_iflag & IGNBRK) {
		sport->port.ignore_status_mask |=
				UTSR0_TO_SM(UTSR0_RBB | UTSR0_REB);
		/*
		 * If we're ignoring parity and break indicators,
		 * ignore overruns too (for real raw support).
		 */
		if (termios->c_iflag & IGNPAR)
			sport->port.ignore_status_mask |=
				UTSR1_TO_SM(UTSR1_ROR);
	}

	del_timer_sync(&sport->timer);

	/*
	 * Update the per-port timeout.
	 */
	uart_update_timeout(port, termios->c_cflag, baud);

	/*
	 * disable interrupts and drain transmitter
	 */
	old_utcr3 = UART_GET_UTCR3(sport);
	UART_PUT_UTCR3(sport, old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE));

	while (UART_GET_UTSR1(sport) & UTSR1_TBY)
		barrier();

	/* then, disable everything */
	UART_PUT_UTCR3(sport, 0);

	/* set the parity, stop bits and data size */
	UART_PUT_UTCR0(sport, utcr0);

	/* set the baud rate */
	quot -= 1;
	UART_PUT_UTCR1(sport, ((quot & 0xf00) >> 8));
	UART_PUT_UTCR2(sport, (quot & 0xff));

	UART_PUT_UTSR0(sport, -1);

	UART_PUT_UTCR3(sport, old_utcr3);

	if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
		sa1100_enable_ms(&sport->port);

	spin_unlock_irqrestore(&sport->port.lock, flags);
}

static const char *sa1100_type(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;

	return sport->port.type == PORT_SA1100 ? "SA1100" : NULL;
}

/*
 * Release the memory region(s) being used by 'port'.
 */
static void sa1100_release_port(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;

	release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
}

/*
 * Request the memory region(s) being used by 'port'.
 */
static int sa1100_request_port(struct uart_port *port)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;

	return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
			"sa11x0-uart") != NULL ? 0 : -EBUSY;
}

/*
 * Configure/autoconfigure the port.
 */
static void sa1100_config_port(struct uart_port *port, int flags)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;

	if (flags & UART_CONFIG_TYPE &&
	    sa1100_request_port(&sport->port) == 0)
		sport->port.type = PORT_SA1100;
}

/*
 * Verify the new serial_struct (for TIOCSSERIAL).
 * The only change we allow are to the flags and type, and
 * even then only between PORT_SA1100 and PORT_UNKNOWN
 */
static int
sa1100_verify_port(struct uart_port *port, struct serial_struct *ser)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;
	int ret = 0;

	if (ser->type != PORT_UNKNOWN && ser->type != PORT_SA1100)
		ret = -EINVAL;
	if (sport->port.irq != ser->irq)
		ret = -EINVAL;
	if (ser->io_type != SERIAL_IO_MEM)
		ret = -EINVAL;
	if (sport->port.uartclk / 16 != ser->baud_base)
		ret = -EINVAL;
	if ((void *)sport->port.mapbase != ser->iomem_base)
		ret = -EINVAL;
	if (sport->port.iobase != ser->port)
		ret = -EINVAL;
	if (ser->hub6 != 0)
		ret = -EINVAL;
	return ret;
}

static struct uart_ops sa1100_pops = {
	.tx_empty	= sa1100_tx_empty,
	.set_mctrl	= sa1100_set_mctrl,
	.get_mctrl	= sa1100_get_mctrl,
	.stop_tx	= sa1100_stop_tx,
	.start_tx	= sa1100_start_tx,
	.stop_rx	= sa1100_stop_rx,
	.enable_ms	= sa1100_enable_ms,
	.break_ctl	= sa1100_break_ctl,
	.startup	= sa1100_startup,
	.shutdown	= sa1100_shutdown,
	.set_termios	= sa1100_set_termios,
	.type		= sa1100_type,
	.release_port	= sa1100_release_port,
	.request_port	= sa1100_request_port,
	.config_port	= sa1100_config_port,
	.verify_port	= sa1100_verify_port,
};

static struct sa1100_port sa1100_ports[NR_PORTS];

/*
 * Setup the SA1100 serial ports.  Note that we don't include the IrDA
 * port here since we have our own SIR/FIR driver (see drivers/net/irda)
 *
 * Note also that we support "console=ttySAx" where "x" is either 0 or 1.
 * Which serial port this ends up being depends on the machine you're
 * running this kernel on.  I'm not convinced that this is a good idea,
 * but that's the way it traditionally works.
 *
 * Note that NanoEngine UART3 becomes UART2, and UART2 is no longer
 * used here.
 */
static void __init sa1100_init_ports(void)
{
	static int first = 1;
	int i;

	if (!first)
		return;
	first = 0;

	for (i = 0; i < NR_PORTS; i++) {
		sa1100_ports[i].port.uartclk   = 3686400;
		sa1100_ports[i].port.ops       = &sa1100_pops;
		sa1100_ports[i].port.fifosize  = 8;
		sa1100_ports[i].port.line      = i;
		sa1100_ports[i].port.iotype    = UPIO_MEM;
		init_timer(&sa1100_ports[i].timer);
		sa1100_ports[i].timer.function = sa1100_timeout;
		sa1100_ports[i].timer.data     = (unsigned long)&sa1100_ports[i];
	}

	/*
	 * make transmit lines outputs, so that when the port
	 * is closed, the output is in the MARK state.
	 */
	PPDR |= PPC_TXD1 | PPC_TXD3;
	PPSR |= PPC_TXD1 | PPC_TXD3;
}

void __init sa1100_register_uart_fns(struct sa1100_port_fns *fns)
{
	if (fns->get_mctrl)
		sa1100_pops.get_mctrl = fns->get_mctrl;
	if (fns->set_mctrl)
		sa1100_pops.set_mctrl = fns->set_mctrl;

	sa1100_pops.pm       = fns->pm;
	sa1100_pops.set_wake = fns->set_wake;
}

void __init sa1100_register_uart(int idx, int port)
{
	if (idx >= NR_PORTS) {
		printk(KERN_ERR "%s: bad index number %d\n", __func__, idx);
		return;
	}

	switch (port) {
	case 1:
		sa1100_ports[idx].port.membase = (void __iomem *)&Ser1UTCR0;
		sa1100_ports[idx].port.mapbase = _Ser1UTCR0;
		sa1100_ports[idx].port.irq     = IRQ_Ser1UART;
		sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
		break;

	case 2:
		sa1100_ports[idx].port.membase = (void __iomem *)&Ser2UTCR0;
		sa1100_ports[idx].port.mapbase = _Ser2UTCR0;
		sa1100_ports[idx].port.irq     = IRQ_Ser2ICP;
		sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
		break;

	case 3:
		sa1100_ports[idx].port.membase = (void __iomem *)&Ser3UTCR0;
		sa1100_ports[idx].port.mapbase = _Ser3UTCR0;
		sa1100_ports[idx].port.irq     = IRQ_Ser3UART;
		sa1100_ports[idx].port.flags   = UPF_BOOT_AUTOCONF;
		break;

	default:
		printk(KERN_ERR "%s: bad port number %d\n", __func__, port);
	}
}


#ifdef CONFIG_SERIAL_SA1100_CONSOLE
static void sa1100_console_putchar(struct uart_port *port, int ch)
{
	struct sa1100_port *sport = (struct sa1100_port *)port;

	while (!(UART_GET_UTSR1(sport) & UTSR1_TNF))
		barrier();
	UART_PUT_CHAR(sport, ch);
}

/*
 * Interrupts are disabled on entering
 */
static void
sa1100_console_write(struct console *co, const char *s, unsigned int count)
{
	struct sa1100_port *sport = &sa1100_ports[co->index];
	unsigned int old_utcr3, status;

	/*
	 *	First, save UTCR3 and then disable interrupts
	 */
	old_utcr3 = UART_GET_UTCR3(sport);
	UART_PUT_UTCR3(sport, (old_utcr3 & ~(UTCR3_RIE | UTCR3_TIE)) |
				UTCR3_TXE);

	uart_console_write(&sport->port, s, count, sa1100_console_putchar);

	/*
	 *	Finally, wait for transmitter to become empty
	 *	and restore UTCR3
	 */
	do {
		status = UART_GET_UTSR1(sport);
	} while (status & UTSR1_TBY);
	UART_PUT_UTCR3(sport, old_utcr3);
}

/*
 * If the port was already initialised (eg, by a boot loader),
 * try to determine the current setup.
 */
static void __init
sa1100_console_get_options(struct sa1100_port *sport, int *baud,
			   int *parity, int *bits)
{
	unsigned int utcr3;

	utcr3 = UART_GET_UTCR3(sport) & (UTCR3_RXE | UTCR3_TXE);
	if (utcr3 == (UTCR3_RXE | UTCR3_TXE)) {
		/* ok, the port was enabled */
		unsigned int utcr0, quot;

		utcr0 = UART_GET_UTCR0(sport);

		*parity = 'n';
		if (utcr0 & UTCR0_PE) {
			if (utcr0 & UTCR0_OES)
				*parity = 'e';
			else
				*parity = 'o';
		}

		if (utcr0 & UTCR0_DSS)
			*bits = 8;
		else
			*bits = 7;

		quot = UART_GET_UTCR2(sport) | UART_GET_UTCR1(sport) << 8;
		quot &= 0xfff;
		*baud = sport->port.uartclk / (16 * (quot + 1));
	}
}

static int __init
sa1100_console_setup(struct console *co, char *options)
{
	struct sa1100_port *sport;
	int baud = 9600;
	int bits = 8;
	int parity = 'n';
	int flow = 'n';

	/*
	 * Check whether an invalid uart number has been specified, and
	 * if so, search for the first available port that does have
	 * console support.
	 */
	if (co->index == -1 || co->index >= NR_PORTS)
		co->index = 0;
	sport = &sa1100_ports[co->index];

	if (options)
		uart_parse_options(options, &baud, &parity, &bits, &flow);
	else
		sa1100_console_get_options(sport, &baud, &parity, &bits);

	return uart_set_options(&sport->port, co, baud, parity, bits, flow);
}

static struct uart_driver sa1100_reg;
static struct console sa1100_console = {
	.name		= "ttySA",
	.write		= sa1100_console_write,
	.device		= uart_console_device,
	.setup		= sa1100_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= -1,
	.data		= &sa1100_reg,
};

static int __init sa1100_rs_console_init(void)
{
	sa1100_init_ports();
	register_console(&sa1100_console);
	return 0;
}
console_initcall(sa1100_rs_console_init);

#define SA1100_CONSOLE	&sa1100_console
#else
#define SA1100_CONSOLE	NULL
#endif

static struct uart_driver sa1100_reg = {
	.owner			= THIS_MODULE,
	.driver_name		= "ttySA",
	.dev_name		= "ttySA",
	.major			= SERIAL_SA1100_MAJOR,
	.minor			= MINOR_START,
	.nr			= NR_PORTS,
	.cons			= SA1100_CONSOLE,
};

static int sa1100_serial_suspend(struct platform_device *dev, pm_message_t state)
{
	struct sa1100_port *sport = platform_get_drvdata(dev);

	if (sport)
		uart_suspend_port(&sa1100_reg, &sport->port);

	return 0;
}

static int sa1100_serial_resume(struct platform_device *dev)
{
	struct sa1100_port *sport = platform_get_drvdata(dev);

	if (sport)
		uart_resume_port(&sa1100_reg, &sport->port);

	return 0;
}

static int sa1100_serial_probe(struct platform_device *dev)
{
	struct resource *res = dev->resource;
	int i;

	for (i = 0; i < dev->num_resources; i++, res++)
		if (res->flags & IORESOURCE_MEM)
			break;

	if (i < dev->num_resources) {
		for (i = 0; i < NR_PORTS; i++) {
			if (sa1100_ports[i].port.mapbase != res->start)
				continue;

			sa1100_ports[i].port.dev = &dev->dev;
			uart_add_one_port(&sa1100_reg, &sa1100_ports[i].port);
			platform_set_drvdata(dev, &sa1100_ports[i]);
			break;
		}
	}

	return 0;
}

static int sa1100_serial_remove(struct platform_device *pdev)
{
	struct sa1100_port *sport = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);

	if (sport)
		uart_remove_one_port(&sa1100_reg, &sport->port);

	return 0;
}

static struct platform_driver sa11x0_serial_driver = {
	.probe		= sa1100_serial_probe,
	.remove		= sa1100_serial_remove,
	.suspend	= sa1100_serial_suspend,
	.resume		= sa1100_serial_resume,
	.driver		= {
		.name	= "sa11x0-uart",
		.owner	= THIS_MODULE,
	},
};

static int __init sa1100_serial_init(void)
{
	int ret;

	printk(KERN_INFO "Serial: SA11x0 driver\n");

	sa1100_init_ports();

	ret = uart_register_driver(&sa1100_reg);
	if (ret == 0) {
		ret = platform_driver_register(&sa11x0_serial_driver);
		if (ret)
			uart_unregister_driver(&sa1100_reg);
	}
	return ret;
}

static void __exit sa1100_serial_exit(void)
{
	platform_driver_unregister(&sa11x0_serial_driver);
	uart_unregister_driver(&sa1100_reg);
}

module_init(sa1100_serial_init);
module_exit(sa1100_serial_exit);

MODULE_AUTHOR("Deep Blue Solutions Ltd");
MODULE_DESCRIPTION("SA1100 generic serial port driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_SA1100_MAJOR);
MODULE_ALIAS("platform:sa11x0-uart");