summaryrefslogtreecommitdiff
path: root/drivers/serial/imx.c
blob: 4e1e80adaf11f4baae5d24e42dcfaaf1be2e26b7 (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
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
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
/*
 *  linux/drivers/serial/imx.c
 *
 *  Driver for Motorola IMX serial ports
 *
 *  Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
 *
 *  Author: Sascha Hauer <sascha@saschahauer.de>
 *  Copyright (C) 2004 Pengutronix
 *
 * 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
 *
 * [29-Mar-2005] Mike Lee
 * Added hardware handshake
 */
#include <linux/config.h>

#if defined(CONFIG_SERIAL_IMX_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/device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware.h>

/* We've been assigned a range on the "Low-density serial ports" major */
#define SERIAL_IMX_MAJOR	204
#define MINOR_START		41

#define NR_PORTS		2

#define IMX_ISR_PASS_LIMIT	256

/*
 * This is the size of our serial port register set.
 */
#define UART_PORT_SIZE	0x100

/*
 * 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)

#define DRIVER_NAME "IMX-uart"

struct imx_port {
	struct uart_port	port;
	struct timer_list	timer;
	unsigned int		old_status;
	int txirq,rxirq;
};

/*
 * Handle any change of modem status signal since we were last called.
 */
static void imx_mctrl_check(struct imx_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 imx_timeout(unsigned long data)
{
	struct imx_port *sport = (struct imx_port *)data;
	unsigned long flags;

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

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

/*
 * interrupts disabled on entry
 */
static void imx_stop_tx(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;
	UCR1((u32)sport->port.membase) &= ~UCR1_TXMPTYEN;
}

/*
 * interrupts disabled on entry
 */
static void imx_stop_rx(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;
	UCR2((u32)sport->port.membase) &= ~UCR2_RXEN;
}

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

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

static inline void imx_transmit_buffer(struct imx_port *sport)
{
	struct circ_buf *xmit = &sport->port.info->xmit;

	do {
		/* send xmit->buf[xmit->tail]
		 * out the port here */
		URTX0((u32)sport->port.membase) = xmit->buf[xmit->tail];
		xmit->tail = (xmit->tail + 1) &
		         (UART_XMIT_SIZE - 1);
		sport->port.icount.tx++;
		if (uart_circ_empty(xmit))
			break;
	} while (!(UTS((u32)sport->port.membase) & UTS_TXFULL));

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

/*
 * interrupts disabled on entry
 */
static void imx_start_tx(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;

	UCR1((u32)sport->port.membase) |= UCR1_TXMPTYEN;

	if(UTS((u32)sport->port.membase) & UTS_TXEMPTY)
		imx_transmit_buffer(sport);
}

static irqreturn_t imx_txint(int irq, void *dev_id, struct pt_regs *regs)
{
	struct imx_port *sport = (struct imx_port *)dev_id;
	struct circ_buf *xmit = &sport->port.info->xmit;
	unsigned long flags;

	spin_lock_irqsave(&sport->port.lock,flags);
	if (sport->port.x_char)
	{
		/* Send next char */
		URTX0((u32)sport->port.membase) = sport->port.x_char;
		goto out;
	}

	if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
		imx_stop_tx(&sport->port);
		goto out;
	}

	imx_transmit_buffer(sport);

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

out:
	spin_unlock_irqrestore(&sport->port.lock,flags);
	return IRQ_HANDLED;
}

static irqreturn_t imx_rxint(int irq, void *dev_id, struct pt_regs *regs)
{
	struct imx_port *sport = dev_id;
	unsigned int rx,flg,ignored = 0;
	struct tty_struct *tty = sport->port.info->tty;
	unsigned long flags;

	rx = URXD0((u32)sport->port.membase);
	spin_lock_irqsave(&sport->port.lock,flags);

	do {
		flg = TTY_NORMAL;
		sport->port.icount.rx++;

		if( USR2((u32)sport->port.membase) & USR2_BRCD ) {
			USR2((u32)sport->port.membase) |= USR2_BRCD;
			if(uart_handle_break(&sport->port))
				goto ignore_char;
		}

		if (uart_handle_sysrq_char
		            (&sport->port, (unsigned char)rx, regs))
			goto ignore_char;

		if( rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) )
			goto handle_error;

	error_return:
		tty_insert_flip_char(tty, rx, flg);

		if (tty->flip.count >= TTY_FLIPBUF_SIZE)
			goto out;

	ignore_char:
		rx = URXD0((u32)sport->port.membase);
	} while(rx & URXD_CHARRDY);

out:
	spin_unlock_irqrestore(&sport->port.lock,flags);
	tty_flip_buffer_push(tty);
	return IRQ_HANDLED;

handle_error:
	if (rx & URXD_PRERR)
		sport->port.icount.parity++;
	else if (rx & URXD_FRMERR)
		sport->port.icount.frame++;
	if (rx & URXD_OVRRUN)
		sport->port.icount.overrun++;

	if (rx & sport->port.ignore_status_mask) {
		if (++ignored > 100)
			goto out;
		goto ignore_char;
	}

	rx &= sport->port.read_status_mask;

	if (rx & URXD_PRERR)
		flg = TTY_PARITY;
	else if (rx & URXD_FRMERR)
		flg = TTY_FRAME;
	if (rx & URXD_OVRRUN)
		flg = TTY_OVERRUN;

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

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

	return USR2((u32)sport->port.membase) & USR2_TXDC ?  TIOCSER_TEMT : 0;
}

/*
 * We have a modem side uart, so the meanings of RTS and CTS are inverted.
 */
static unsigned int imx_get_mctrl(struct uart_port *port)
{
        struct imx_port *sport = (struct imx_port *)port;
        unsigned int tmp = TIOCM_DSR | TIOCM_CAR;

        if (USR1((u32)sport->port.membase) & USR1_RTSS)
                tmp |= TIOCM_CTS;

        if (UCR2((u32)sport->port.membase) & UCR2_CTS)
                tmp |= TIOCM_RTS;

        return tmp;
}

static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
        struct imx_port *sport = (struct imx_port *)port;

        if (mctrl & TIOCM_RTS)
                UCR2((u32)sport->port.membase) |= UCR2_CTS;
        else
                UCR2((u32)sport->port.membase) &= ~UCR2_CTS;
}

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

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

	if ( break_state != 0 )
		UCR1((u32)sport->port.membase) |= UCR1_SNDBRK;
	else
		UCR1((u32)sport->port.membase) &= ~UCR1_SNDBRK;

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

#define TXTL 2 /* reset default */
#define RXTL 1 /* reset default */

static int imx_setup_ufcr(struct imx_port *sport, unsigned int mode)
{
	unsigned int val;
	unsigned int ufcr_rfdiv;

	/* set receiver / transmitter trigger level.
	 * RFDIV is set such way to satisfy requested uartclk value
	 */
	val = TXTL<<10 | RXTL;
	ufcr_rfdiv = (imx_get_perclk1() + sport->port.uartclk / 2) / sport->port.uartclk;

	if(!ufcr_rfdiv)
		ufcr_rfdiv = 1;

	if(ufcr_rfdiv >= 7)
		ufcr_rfdiv = 6;
	else
		ufcr_rfdiv = 6 - ufcr_rfdiv;

	val |= UFCR_RFDIV & (ufcr_rfdiv << 7);

	UFCR((u32)sport->port.membase) = val;

	return 0;
}

static int imx_startup(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;
	int retval;
	unsigned long flags;

	imx_setup_ufcr(sport, 0);

	/* disable the DREN bit (Data Ready interrupt enable) before
	 * requesting IRQs
	 */
	UCR4((u32)sport->port.membase) &= ~UCR4_DREN;

	/*
	 * Allocate the IRQ
	 */
	retval = request_irq(sport->rxirq, imx_rxint, 0,
			     DRIVER_NAME, sport);
	if (retval) goto error_out2;

	retval = request_irq(sport->txirq, imx_txint, 0,
			     "imx-uart", sport);
	if (retval) goto error_out1;

	/*
	 * Finally, clear and enable interrupts
	 */

	UCR1((u32)sport->port.membase) |=
	                 (UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN);

	UCR2((u32)sport->port.membase) |= (UCR2_RXEN | UCR2_TXEN);
	/*
	 * Enable modem status interrupts
	 */
	spin_lock_irqsave(&sport->port.lock,flags);
	imx_enable_ms(&sport->port);
	spin_unlock_irqrestore(&sport->port.lock,flags);

	return 0;

error_out1:
	free_irq(sport->rxirq, sport);
error_out2:
	free_irq(sport->txirq, sport);
	return retval;
}

static void imx_shutdown(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;

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

	/*
	 * Free the interrupts
	 */
	free_irq(sport->txirq, sport);
	free_irq(sport->rxirq, sport);

	/*
	 * Disable all interrupts, port and break condition.
	 */

	UCR1((u32)sport->port.membase) &=
	                 ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_UARTEN);
}

static void
imx_set_termios(struct uart_port *port, struct termios *termios,
		   struct termios *old)
{
	struct imx_port *sport = (struct imx_port *)port;
	unsigned long flags;
	unsigned int ucr2, old_ucr1, old_txrxen, baud, quot;
	unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;

	/*
	 * If we don't support modem control lines, don't allow
	 * these to be set.
	 */
	if (0) {
		termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR);
		termios->c_cflag |= CLOCAL;
	}

	/*
	 * 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)
		ucr2 = UCR2_WS | UCR2_SRST | UCR2_IRTS;
	else
		ucr2 = UCR2_SRST | UCR2_IRTS;

	if (termios->c_cflag & CRTSCTS) {
		ucr2 &= ~UCR2_IRTS;
		ucr2 |= UCR2_CTSC;
	}

	if (termios->c_cflag & CSTOPB)
		ucr2 |= UCR2_STPB;
	if (termios->c_cflag & PARENB) {
		ucr2 |= UCR2_PREN;
		if (!(termios->c_cflag & PARODD))
			ucr2 |= UCR2_PROE;
	}

	/*
	 * 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 = 0;
	if (termios->c_iflag & INPCK)
		sport->port.read_status_mask |= (URXD_FRMERR | URXD_PRERR);
	if (termios->c_iflag & (BRKINT | PARMRK))
		sport->port.read_status_mask |= URXD_BRK;

	/*
	 * Characters to ignore
	 */
	sport->port.ignore_status_mask = 0;
	if (termios->c_iflag & IGNPAR)
		sport->port.ignore_status_mask |= URXD_PRERR;
	if (termios->c_iflag & IGNBRK) {
		sport->port.ignore_status_mask |= URXD_BRK;
		/*
		 * 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 |= URXD_OVRRUN;
	}

	del_timer_sync(&sport->timer);

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

	/*
	 * disable interrupts and drain transmitter
	 */
	old_ucr1 = UCR1((u32)sport->port.membase);
	UCR1((u32)sport->port.membase) &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN);

	while ( !(USR2((u32)sport->port.membase) & USR2_TXDC))
		barrier();

	/* then, disable everything */
	old_txrxen = UCR2((u32)sport->port.membase) & ( UCR2_TXEN | UCR2_RXEN );
	UCR2((u32)sport->port.membase) &= ~( UCR2_TXEN | UCR2_RXEN);

	/* set the parity, stop bits and data size */
	UCR2((u32)sport->port.membase) = ucr2;

	/* set the baud rate. We assume uartclk = 16 MHz
	 *
	 * baud * 16   UBIR - 1
	 * --------- = --------
	 *  uartclk    UBMR - 1
	 */
	UBIR((u32)sport->port.membase) = (baud / 100) - 1;
	UBMR((u32)sport->port.membase) = 10000 - 1;

	UCR1((u32)sport->port.membase) = old_ucr1;
	UCR2((u32)sport->port.membase) |= old_txrxen;

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

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

static const char *imx_type(struct uart_port *port)
{
	struct imx_port *sport = (struct imx_port *)port;

	return sport->port.type == PORT_IMX ? "IMX" : NULL;
}

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

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

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

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

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

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

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

	if (ser->type != PORT_UNKNOWN && ser->type != PORT_IMX)
		ret = -EINVAL;
	if (sport->port.irq != ser->irq)
		ret = -EINVAL;
	if (ser->io_type != UPIO_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 imx_pops = {
	.tx_empty	= imx_tx_empty,
	.set_mctrl	= imx_set_mctrl,
	.get_mctrl	= imx_get_mctrl,
	.stop_tx	= imx_stop_tx,
	.start_tx	= imx_start_tx,
	.stop_rx	= imx_stop_rx,
	.enable_ms	= imx_enable_ms,
	.break_ctl	= imx_break_ctl,
	.startup	= imx_startup,
	.shutdown	= imx_shutdown,
	.set_termios	= imx_set_termios,
	.type		= imx_type,
	.release_port	= imx_release_port,
	.request_port	= imx_request_port,
	.config_port	= imx_config_port,
	.verify_port	= imx_verify_port,
};

static struct imx_port imx_ports[] = {
	{
	.txirq  = UART1_MINT_TX,
	.rxirq  = UART1_MINT_RX,
	.port	= {
		.type		= PORT_IMX,
		.iotype		= SERIAL_IO_MEM,
		.membase	= (void *)IMX_UART1_BASE,
		.mapbase	= IMX_UART1_BASE, /* FIXME */
		.irq		= UART1_MINT_RX,
		.uartclk	= 16000000,
		.fifosize	= 8,
		.flags		= ASYNC_BOOT_AUTOCONF,
		.ops		= &imx_pops,
		.line		= 0,
	},
	}, {
	.txirq  = UART2_MINT_TX,
	.rxirq  = UART2_MINT_RX,
	.port	= {
		.type		= PORT_IMX,
		.iotype		= SERIAL_IO_MEM,
		.membase	= (void *)IMX_UART2_BASE,
		.mapbase	= IMX_UART2_BASE, /* FIXME */
		.irq		= UART2_MINT_RX,
		.uartclk	= 16000000,
		.fifosize	= 8,
		.flags		= ASYNC_BOOT_AUTOCONF,
		.ops		= &imx_pops,
		.line		= 1,
	},
	}
};

/*
 * Setup the IMX serial ports.
 * Note also that we support "console=ttySMXx" 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.
 *
 */
static void __init imx_init_ports(void)
{
	static int first = 1;
	int i;

	if (!first)
		return;
	first = 0;

	for (i = 0; i < ARRAY_SIZE(imx_ports); i++) {
		init_timer(&imx_ports[i].timer);
		imx_ports[i].timer.function = imx_timeout;
		imx_ports[i].timer.data     = (unsigned long)&imx_ports[i];
	}

	imx_gpio_mode(PC9_PF_UART1_CTS);
	imx_gpio_mode(PC10_PF_UART1_RTS);
	imx_gpio_mode(PC11_PF_UART1_TXD);
	imx_gpio_mode(PC12_PF_UART1_RXD);
	imx_gpio_mode(PB28_PF_UART2_CTS);
	imx_gpio_mode(PB29_PF_UART2_RTS);

	imx_gpio_mode(PB30_PF_UART2_TXD);
	imx_gpio_mode(PB31_PF_UART2_RXD);

#if 0 /* We don't need these, on the mx1 the _modem_ side of the uart
       * is implemented.
       */
	imx_gpio_mode(PD7_AF_UART2_DTR);
	imx_gpio_mode(PD8_AF_UART2_DCD);
	imx_gpio_mode(PD9_AF_UART2_RI);
	imx_gpio_mode(PD10_AF_UART2_DSR);
#endif


}

#ifdef CONFIG_SERIAL_IMX_CONSOLE

/*
 * Interrupts are disabled on entering
 */
static void
imx_console_write(struct console *co, const char *s, unsigned int count)
{
	struct imx_port *sport = &imx_ports[co->index];
	unsigned int old_ucr1, old_ucr2, i;

	/*
	 *	First, save UCR1/2 and then disable interrupts
	 */
	old_ucr1 = UCR1((u32)sport->port.membase);
	old_ucr2 = UCR2((u32)sport->port.membase);

	UCR1((u32)sport->port.membase) =
	                   (old_ucr1 | UCR1_UARTCLKEN | UCR1_UARTEN)
	                   & ~(UCR1_TXMPTYEN | UCR1_RRDYEN);
	UCR2((u32)sport->port.membase) = old_ucr2 | UCR2_TXEN;

	/*
	 *	Now, do each character
	 */
	for (i = 0; i < count; i++) {

		while ((UTS((u32)sport->port.membase) & UTS_TXFULL))
			barrier();

		URTX0((u32)sport->port.membase) = s[i];

		if (s[i] == '\n') {
			while ((UTS((u32)sport->port.membase) & UTS_TXFULL))
				barrier();
			URTX0((u32)sport->port.membase) = '\r';
		}
	}

	/*
	 *	Finally, wait for transmitter to become empty
	 *	and restore UCR1/2
	 */
	while (!(USR2((u32)sport->port.membase) & USR2_TXDC));

	UCR1((u32)sport->port.membase) = old_ucr1;
	UCR2((u32)sport->port.membase) = old_ucr2;
}

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

	if ( UCR1((u32)sport->port.membase) | UCR1_UARTEN ) {
		/* ok, the port was enabled */
		unsigned int ucr2, ubir,ubmr, uartclk;
		unsigned int baud_raw;
		unsigned int ucfr_rfdiv;

		ucr2 = UCR2((u32)sport->port.membase);

		*parity = 'n';
		if (ucr2 & UCR2_PREN) {
			if (ucr2 & UCR2_PROE)
				*parity = 'o';
			else
				*parity = 'e';
		}

		if (ucr2 & UCR2_WS)
			*bits = 8;
		else
			*bits = 7;

		ubir = UBIR((u32)sport->port.membase) & 0xffff;
		ubmr = UBMR((u32)sport->port.membase) & 0xffff;


		ucfr_rfdiv = (UFCR((u32)sport->port.membase) & UFCR_RFDIV) >> 7;
		if (ucfr_rfdiv == 6)
			ucfr_rfdiv = 7;
		else
			ucfr_rfdiv = 6 - ucfr_rfdiv;

		uartclk = imx_get_perclk1();
		uartclk /= ucfr_rfdiv;

		{	/*
			 * The next code provides exact computation of
			 *   baud_raw = round(((uartclk/16) * (ubir + 1)) / (ubmr + 1))
			 * without need of float support or long long division,
			 * which would be required to prevent 32bit arithmetic overflow
			 */
			unsigned int mul = ubir + 1;
			unsigned int div = 16 * (ubmr + 1);
			unsigned int rem = uartclk % div;

			baud_raw = (uartclk / div) * mul;
			baud_raw += (rem * mul + div / 2) / div;
			*baud = (baud_raw + 50) / 100 * 100;
		}

		if(*baud != baud_raw)
			printk(KERN_INFO "Serial: Console IMX rounded baud rate from %d to %d\n",
				baud_raw, *baud);
	}
}

static int __init
imx_console_setup(struct console *co, char *options)
{
	struct imx_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 >= ARRAY_SIZE(imx_ports))
		co->index = 0;
	sport = &imx_ports[co->index];

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

	imx_setup_ufcr(sport, 0);

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

static struct uart_driver imx_reg;
static struct console imx_console = {
	.name		= "ttySMX",
	.write		= imx_console_write,
	.device		= uart_console_device,
	.setup		= imx_console_setup,
	.flags		= CON_PRINTBUFFER,
	.index		= -1,
	.data		= &imx_reg,
};

static int __init imx_rs_console_init(void)
{
	imx_init_ports();
	register_console(&imx_console);
	return 0;
}
console_initcall(imx_rs_console_init);

#define IMX_CONSOLE	&imx_console
#else
#define IMX_CONSOLE	NULL
#endif

static struct uart_driver imx_reg = {
	.owner          = THIS_MODULE,
	.driver_name    = DRIVER_NAME,
	.dev_name       = "ttySMX",
	.devfs_name	= "ttsmx/",
	.major          = SERIAL_IMX_MAJOR,
	.minor          = MINOR_START,
	.nr             = ARRAY_SIZE(imx_ports),
	.cons           = IMX_CONSOLE,
};

static int serial_imx_suspend(struct device *_dev, pm_message_t state, u32 level)
{
        struct imx_port *sport = dev_get_drvdata(_dev);

        if (sport && level == SUSPEND_DISABLE)
                uart_suspend_port(&imx_reg, &sport->port);

        return 0;
}

static int serial_imx_resume(struct device *_dev, u32 level)
{
        struct imx_port *sport = dev_get_drvdata(_dev);

        if (sport && level == RESUME_ENABLE)
                uart_resume_port(&imx_reg, &sport->port);

        return 0;
}

static int serial_imx_probe(struct device *_dev)
{
	struct platform_device *dev = to_platform_device(_dev);

	imx_ports[dev->id].port.dev = _dev;
	uart_add_one_port(&imx_reg, &imx_ports[dev->id].port);
	dev_set_drvdata(_dev, &imx_ports[dev->id]);
	return 0;
}

static int serial_imx_remove(struct device *_dev)
{
	struct imx_port *sport = dev_get_drvdata(_dev);

	dev_set_drvdata(_dev, NULL);

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

	return 0;
}

static struct device_driver serial_imx_driver = {
        .name           = "imx-uart",
        .bus            = &platform_bus_type,
        .probe          = serial_imx_probe,
        .remove         = serial_imx_remove,

	.suspend	= serial_imx_suspend,
	.resume		= serial_imx_resume,
};

static int __init imx_serial_init(void)
{
	int ret;

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

	imx_init_ports();

	ret = uart_register_driver(&imx_reg);
	if (ret)
		return ret;

	ret = driver_register(&serial_imx_driver);
	if (ret != 0)
		uart_unregister_driver(&imx_reg);

	return 0;
}

static void __exit imx_serial_exit(void)
{
	uart_unregister_driver(&imx_reg);
}

module_init(imx_serial_init);
module_exit(imx_serial_exit);

MODULE_AUTHOR("Sascha Hauer");
MODULE_DESCRIPTION("IMX generic serial port driver");
MODULE_LICENSE("GPL");