summaryrefslogtreecommitdiffstats
path: root/sound/aoa/soundbus/i2sbus/pcm.c
blob: 59bacd365733f869513df9cdb81797ad7389cfba (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
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
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
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
/*
 * i2sbus driver -- pcm routines
 *
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 *
 * GPL v2, can be found in COPYING.
 */

#include <asm/io.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <asm/macio.h>
#include <linux/pci.h>
#include "../soundbus.h"
#include "i2sbus.h"

static inline void get_pcm_info(struct i2sbus_dev *i2sdev, int in,
				struct pcm_info **pi, struct pcm_info **other)
{
	if (in) {
		if (pi)
			*pi = &i2sdev->in;
		if (other)
			*other = &i2sdev->out;
	} else {
		if (pi)
			*pi = &i2sdev->out;
		if (other)
			*other = &i2sdev->in;
	}
}

static int clock_and_divisors(int mclk, int sclk, int rate, int *out)
{
	/* sclk must be derived from mclk! */
	if (mclk % sclk)
		return -1;
	/* derive sclk register value */
	if (i2s_sf_sclkdiv(mclk / sclk, out))
		return -1;

	if (I2S_CLOCK_SPEED_18MHz % (rate * mclk) == 0) {
		if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_18MHz / (rate * mclk), out)) {
			*out |= I2S_SF_CLOCK_SOURCE_18MHz;
			return 0;
		}
	}
	if (I2S_CLOCK_SPEED_45MHz % (rate * mclk) == 0) {
		if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_45MHz / (rate * mclk), out)) {
			*out |= I2S_SF_CLOCK_SOURCE_45MHz;
			return 0;
		}
	}
	if (I2S_CLOCK_SPEED_49MHz % (rate * mclk) == 0) {
		if (!i2s_sf_mclkdiv(I2S_CLOCK_SPEED_49MHz / (rate * mclk), out)) {
			*out |= I2S_SF_CLOCK_SOURCE_49MHz;
			return 0;
		}
	}
	return -1;
}

#define CHECK_RATE(rate)						\
	do { if (rates & SNDRV_PCM_RATE_ ##rate) {			\
		int dummy;						\
		if (clock_and_divisors(sysclock_factor,			\
				       bus_factor, rate, &dummy))	\
			rates &= ~SNDRV_PCM_RATE_ ##rate;		\
	} } while (0)

static int i2sbus_pcm_open(struct i2sbus_dev *i2sdev, int in)
{
	struct pcm_info *pi, *other;
	struct soundbus_dev *sdev;
	int masks_inited = 0, err;
	struct codec_info_item *cii, *rev;
	struct snd_pcm_hardware *hw;
	u64 formats = 0;
	unsigned int rates = 0;
	struct transfer_info v;
	int result = 0;
	int bus_factor = 0, sysclock_factor = 0;
	int found_this;

	mutex_lock(&i2sdev->lock);

	get_pcm_info(i2sdev, in, &pi, &other);

	hw = &pi->substream->runtime->hw;
	sdev = &i2sdev->sound;

	if (pi->active) {
		/* alsa messed up */
		result = -EBUSY;
		goto out_unlock;
	}

	/* we now need to assign the hw */
	list_for_each_entry(cii, &sdev->codec_list, list) {
		struct transfer_info *ti = cii->codec->transfers;
		bus_factor = cii->codec->bus_factor;
		sysclock_factor = cii->codec->sysclock_factor;
		while (ti->formats && ti->rates) {
			v = *ti;
			if (ti->transfer_in == in
			    && cii->codec->usable(cii, ti, &v)) {
				if (masks_inited) {
					formats &= v.formats;
					rates &= v.rates;
				} else {
					formats = v.formats;
					rates = v.rates;
					masks_inited = 1;
				}
			}
			ti++;
		}
	}
	if (!masks_inited || !bus_factor || !sysclock_factor) {
		result = -ENODEV;
		goto out_unlock;
	}
	/* bus dependent stuff */
	hw->info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
		   SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_RESUME |
		   SNDRV_PCM_INFO_JOINT_DUPLEX;

	CHECK_RATE(5512);
	CHECK_RATE(8000);
	CHECK_RATE(11025);
	CHECK_RATE(16000);
	CHECK_RATE(22050);
	CHECK_RATE(32000);
	CHECK_RATE(44100);
	CHECK_RATE(48000);
	CHECK_RATE(64000);
	CHECK_RATE(88200);
	CHECK_RATE(96000);
	CHECK_RATE(176400);
	CHECK_RATE(192000);
	hw->rates = rates;

	/* well. the codec might want 24 bits only, and we'll
	 * ever only transfer 24 bits, but they are top-aligned!
	 * So for alsa, we claim that we're doing full 32 bit
	 * while in reality we'll ignore the lower 8 bits of
	 * that when doing playback (they're transferred as 0
	 * as far as I know, no codecs we have are 32-bit capable
	 * so I can't really test) and when doing recording we'll
	 * always have those lower 8 bits recorded as 0 */
	if (formats & SNDRV_PCM_FMTBIT_S24_BE)
		formats |= SNDRV_PCM_FMTBIT_S32_BE;
	if (formats & SNDRV_PCM_FMTBIT_U24_BE)
		formats |= SNDRV_PCM_FMTBIT_U32_BE;
	/* now mask off what we can support. I suppose we could
	 * also support S24_3LE and some similar formats, but I
	 * doubt there's a codec that would be able to use that,
	 * so we don't support it here. */
	hw->formats = formats & (SNDRV_PCM_FMTBIT_S16_BE |
				 SNDRV_PCM_FMTBIT_U16_BE |
				 SNDRV_PCM_FMTBIT_S32_BE |
				 SNDRV_PCM_FMTBIT_U32_BE);

	/* we need to set the highest and lowest rate possible.
	 * These are the highest and lowest rates alsa can
	 * support properly in its bitfield.
	 * Below, we'll use that to restrict to the rate
	 * currently in use (if any). */
	hw->rate_min = 5512;
	hw->rate_max = 192000;
	/* if the other stream is active, then we can only
	 * support what it is currently using.
	 * FIXME: I lied. This comment is wrong. We can support
	 * anything that works with the same serial format, ie.
	 * when recording 24 bit sound we can well play 16 bit
	 * sound at the same time iff using the same transfer mode.
	 */
	if (other->active) {
		/* FIXME: is this guaranteed by the alsa api? */
		hw->formats &= (1ULL << i2sdev->format);
		/* see above, restrict rates to the one we already have */
		hw->rate_min = i2sdev->rate;
		hw->rate_max = i2sdev->rate;
	}

	hw->channels_min = 2;
	hw->channels_max = 2;
	/* these are somewhat arbitrary */
	hw->buffer_bytes_max = 131072;
	hw->period_bytes_min = 256;
	hw->period_bytes_max = 16384;
	hw->periods_min = 3;
	hw->periods_max = MAX_DBDMA_COMMANDS;
	err = snd_pcm_hw_constraint_integer(pi->substream->runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);
	if (err < 0) {
		result = err;
		goto out_unlock;
	}
	list_for_each_entry(cii, &sdev->codec_list, list) {
		if (cii->codec->open) {
			err = cii->codec->open(cii, pi->substream);
			if (err) {
				result = err;
				/* unwind */
				found_this = 0;
				list_for_each_entry_reverse(rev,
				    &sdev->codec_list, list) {
					if (found_this && rev->codec->close) {
						rev->codec->close(rev,
								pi->substream);
					}
					if (rev == cii)
						found_this = 1;
				}
				goto out_unlock;
			}
		}
	}

 out_unlock:
	mutex_unlock(&i2sdev->lock);
	return result;
}

#undef CHECK_RATE

static int i2sbus_pcm_close(struct i2sbus_dev *i2sdev, int in)
{
	struct codec_info_item *cii;
	struct pcm_info *pi;
	int err = 0, tmp;

	mutex_lock(&i2sdev->lock);

	get_pcm_info(i2sdev, in, &pi, NULL);

	list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
		if (cii->codec->close) {
			tmp = cii->codec->close(cii, pi->substream);
			if (tmp)
				err = tmp;
		}
	}

	pi->substream = NULL;
	pi->active = 0;
	mutex_unlock(&i2sdev->lock);
	return err;
}

static void i2sbus_wait_for_stop(struct i2sbus_dev *i2sdev,
				 struct pcm_info *pi)
{
	unsigned long flags;
	struct completion done;
	long timeout;

	spin_lock_irqsave(&i2sdev->low_lock, flags);
	if (pi->dbdma_ring.stopping) {
		init_completion(&done);
		pi->stop_completion = &done;
		spin_unlock_irqrestore(&i2sdev->low_lock, flags);
		timeout = wait_for_completion_timeout(&done, HZ);
		spin_lock_irqsave(&i2sdev->low_lock, flags);
		pi->stop_completion = NULL;
		if (timeout == 0) {
			/* timeout expired, stop dbdma forcefully */
			printk(KERN_ERR "i2sbus_wait_for_stop: timed out\n");
			/* make sure RUN, PAUSE and S0 bits are cleared */
			out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);
			pi->dbdma_ring.stopping = 0;
			timeout = 10;
			while (in_le32(&pi->dbdma->status) & ACTIVE) {
				if (--timeout <= 0)
					break;
				udelay(1);
			}
		}
	}
	spin_unlock_irqrestore(&i2sdev->low_lock, flags);
}

#ifdef CONFIG_PM
void i2sbus_wait_for_stop_both(struct i2sbus_dev *i2sdev)
{
	struct pcm_info *pi;

	get_pcm_info(i2sdev, 0, &pi, NULL);
	i2sbus_wait_for_stop(i2sdev, pi);
	get_pcm_info(i2sdev, 1, &pi, NULL);
	i2sbus_wait_for_stop(i2sdev, pi);
}
#endif

static int i2sbus_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params)
{
	return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
}

static inline int i2sbus_hw_free(struct snd_pcm_substream *substream, int in)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
	struct pcm_info *pi;

	get_pcm_info(i2sdev, in, &pi, NULL);
	if (pi->dbdma_ring.stopping)
		i2sbus_wait_for_stop(i2sdev, pi);
	snd_pcm_lib_free_pages(substream);
	return 0;
}

static int i2sbus_playback_hw_free(struct snd_pcm_substream *substream)
{
	return i2sbus_hw_free(substream, 0);
}

static int i2sbus_record_hw_free(struct snd_pcm_substream *substream)
{
	return i2sbus_hw_free(substream, 1);
}

static int i2sbus_pcm_prepare(struct i2sbus_dev *i2sdev, int in)
{
	/* whee. Hard work now. The user has selected a bitrate
	 * and bit format, so now we have to program our
	 * I2S controller appropriately. */
	struct snd_pcm_runtime *runtime;
	struct dbdma_cmd *command;
	int i, periodsize, nperiods;
	dma_addr_t offset;
	struct bus_info bi;
	struct codec_info_item *cii;
	int sfr = 0;		/* serial format register */
	int dws = 0;		/* data word sizes reg */
	int input_16bit;
	struct pcm_info *pi, *other;
	int cnt;
	int result = 0;
	unsigned int cmd, stopaddr;

	mutex_lock(&i2sdev->lock);

	get_pcm_info(i2sdev, in, &pi, &other);

	if (pi->dbdma_ring.running) {
		result = -EBUSY;
		goto out_unlock;
	}
	if (pi->dbdma_ring.stopping)
		i2sbus_wait_for_stop(i2sdev, pi);

	if (!pi->substream || !pi->substream->runtime) {
		result = -EINVAL;
		goto out_unlock;
	}

	runtime = pi->substream->runtime;
	pi->active = 1;
	if (other->active &&
	    ((i2sdev->format != runtime->format)
	     || (i2sdev->rate != runtime->rate))) {
		result = -EINVAL;
		goto out_unlock;
	}

	i2sdev->format = runtime->format;
	i2sdev->rate = runtime->rate;

	periodsize = snd_pcm_lib_period_bytes(pi->substream);
	nperiods = pi->substream->runtime->periods;
	pi->current_period = 0;

	/* generate dbdma command ring first */
	command = pi->dbdma_ring.cmds;
	memset(command, 0, (nperiods + 2) * sizeof(struct dbdma_cmd));

	/* commands to DMA to/from the ring */
	/*
	 * For input, we need to do a graceful stop; if we abort
	 * the DMA, we end up with leftover bytes that corrupt
	 * the next recording.  To do this we set the S0 status
	 * bit and wait for the DMA controller to stop.  Each
	 * command has a branch condition to
	 * make it branch to a stop command if S0 is set.
	 * On input we also need to wait for the S7 bit to be
	 * set before turning off the DMA controller.
	 * In fact we do the graceful stop for output as well.
	 */
	offset = runtime->dma_addr;
	cmd = (in? INPUT_MORE: OUTPUT_MORE) | BR_IFSET | INTR_ALWAYS;
	stopaddr = pi->dbdma_ring.bus_cmd_start +
		(nperiods + 1) * sizeof(struct dbdma_cmd);
	for (i = 0; i < nperiods; i++, command++, offset += periodsize) {
		command->command = cpu_to_le16(cmd);
		command->cmd_dep = cpu_to_le32(stopaddr);
		command->phy_addr = cpu_to_le32(offset);
		command->req_count = cpu_to_le16(periodsize);
	}

	/* branch back to beginning of ring */
	command->command = cpu_to_le16(DBDMA_NOP | BR_ALWAYS);
	command->cmd_dep = cpu_to_le32(pi->dbdma_ring.bus_cmd_start);
	command++;

	/* set stop command */
	command->command = cpu_to_le16(DBDMA_STOP);

	/* ok, let's set the serial format and stuff */
	switch (runtime->format) {
	/* 16 bit formats */
	case SNDRV_PCM_FORMAT_S16_BE:
	case SNDRV_PCM_FORMAT_U16_BE:
		/* FIXME: if we add different bus factors we need to
		 * do more here!! */
		bi.bus_factor = 0;
		list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
			bi.bus_factor = cii->codec->bus_factor;
			break;
		}
		if (!bi.bus_factor) {
			result = -ENODEV;
			goto out_unlock;
		}
		input_16bit = 1;
		break;
	case SNDRV_PCM_FORMAT_S32_BE:
	case SNDRV_PCM_FORMAT_U32_BE:
		/* force 64x bus speed, otherwise the data cannot be
		 * transferred quickly enough! */
		bi.bus_factor = 64;
		input_16bit = 0;
		break;
	default:
		result = -EINVAL;
		goto out_unlock;
	}
	/* we assume all sysclocks are the same! */
	list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
		bi.sysclock_factor = cii->codec->sysclock_factor;
		break;
	}

	if (clock_and_divisors(bi.sysclock_factor,
			       bi.bus_factor,
			       runtime->rate,
			       &sfr) < 0) {
		result = -EINVAL;
		goto out_unlock;
	}
	switch (bi.bus_factor) {
	case 32:
		sfr |= I2S_SF_SERIAL_FORMAT_I2S_32X;
		break;
	case 64:
		sfr |= I2S_SF_SERIAL_FORMAT_I2S_64X;
		break;
	}
	/* FIXME: THIS ASSUMES MASTER ALL THE TIME */
	sfr |= I2S_SF_SCLK_MASTER;

	list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
		int err = 0;
		if (cii->codec->prepare)
			err = cii->codec->prepare(cii, &bi, pi->substream);
		if (err) {
			result = err;
			goto out_unlock;
		}
	}
	/* codecs are fine with it, so set our clocks */
	if (input_16bit)
		dws =	(2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
			(2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
			I2S_DWS_DATA_IN_16BIT | I2S_DWS_DATA_OUT_16BIT;
	else
		dws =	(2 << I2S_DWS_NUM_CHANNELS_IN_SHIFT) |
			(2 << I2S_DWS_NUM_CHANNELS_OUT_SHIFT) |
			I2S_DWS_DATA_IN_24BIT | I2S_DWS_DATA_OUT_24BIT;

	/* early exit if already programmed correctly */
	/* not locking these is fine since we touch them only in this function */
	if (in_le32(&i2sdev->intfregs->serial_format) == sfr
	 && in_le32(&i2sdev->intfregs->data_word_sizes) == dws)
		goto out_unlock;

	/* let's notify the codecs about clocks going away.
	 * For now we only do mastering on the i2s cell... */
	list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
		if (cii->codec->switch_clock)
			cii->codec->switch_clock(cii, CLOCK_SWITCH_PREPARE_SLAVE);

	i2sbus_control_enable(i2sdev->control, i2sdev);
	i2sbus_control_cell(i2sdev->control, i2sdev, 1);

	out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);

	i2sbus_control_clock(i2sdev->control, i2sdev, 0);

	msleep(1);

	/* wait for clock stopped. This can apparently take a while... */
	cnt = 100;
	while (cnt-- &&
	    !(in_le32(&i2sdev->intfregs->intr_ctl) & I2S_PENDING_CLOCKS_STOPPED)) {
		msleep(5);
	}
	out_le32(&i2sdev->intfregs->intr_ctl, I2S_PENDING_CLOCKS_STOPPED);

	/* not locking these is fine since we touch them only in this function */
	out_le32(&i2sdev->intfregs->serial_format, sfr);
	out_le32(&i2sdev->intfregs->data_word_sizes, dws);

        i2sbus_control_enable(i2sdev->control, i2sdev);
        i2sbus_control_cell(i2sdev->control, i2sdev, 1);
        i2sbus_control_clock(i2sdev->control, i2sdev, 1);
	msleep(1);

	list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
		if (cii->codec->switch_clock)
			cii->codec->switch_clock(cii, CLOCK_SWITCH_SLAVE);

 out_unlock:
	mutex_unlock(&i2sdev->lock);
	return result;
}

#ifdef CONFIG_PM
void i2sbus_pcm_prepare_both(struct i2sbus_dev *i2sdev)
{
	i2sbus_pcm_prepare(i2sdev, 0);
	i2sbus_pcm_prepare(i2sdev, 1);
}
#endif

static int i2sbus_pcm_trigger(struct i2sbus_dev *i2sdev, int in, int cmd)
{
	struct codec_info_item *cii;
	struct pcm_info *pi;
	int result = 0;
	unsigned long flags;

	spin_lock_irqsave(&i2sdev->low_lock, flags);

	get_pcm_info(i2sdev, in, &pi, NULL);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		if (pi->dbdma_ring.running) {
			result = -EALREADY;
			goto out_unlock;
		}
		list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
			if (cii->codec->start)
				cii->codec->start(cii, pi->substream);
		pi->dbdma_ring.running = 1;

		if (pi->dbdma_ring.stopping) {
			/* Clear the S0 bit, then see if we stopped yet */
			out_le32(&pi->dbdma->control, 1 << 16);
			if (in_le32(&pi->dbdma->status) & ACTIVE) {
				/* possible race here? */
				udelay(10);
				if (in_le32(&pi->dbdma->status) & ACTIVE) {
					pi->dbdma_ring.stopping = 0;
					goto out_unlock; /* keep running */
				}
			}
		}

		/* make sure RUN, PAUSE and S0 bits are cleared */
		out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);

		/* set branch condition select register */
		out_le32(&pi->dbdma->br_sel, (1 << 16) | 1);

		/* write dma command buffer address to the dbdma chip */
		out_le32(&pi->dbdma->cmdptr, pi->dbdma_ring.bus_cmd_start);

		/* initialize the frame count and current period */
		pi->current_period = 0;
		pi->frame_count = in_le32(&i2sdev->intfregs->frame_count);

		/* set the DMA controller running */
		out_le32(&pi->dbdma->control, (RUN << 16) | RUN);

		/* off you go! */
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		if (!pi->dbdma_ring.running) {
			result = -EALREADY;
			goto out_unlock;
		}
		pi->dbdma_ring.running = 0;

		/* Set the S0 bit to make the DMA branch to the stop cmd */
		out_le32(&pi->dbdma->control, (1 << 16) | 1);
		pi->dbdma_ring.stopping = 1;

		list_for_each_entry(cii, &i2sdev->sound.codec_list, list)
			if (cii->codec->stop)
				cii->codec->stop(cii, pi->substream);
		break;
	default:
		result = -EINVAL;
		goto out_unlock;
	}

 out_unlock:
	spin_unlock_irqrestore(&i2sdev->low_lock, flags);
	return result;
}

static snd_pcm_uframes_t i2sbus_pcm_pointer(struct i2sbus_dev *i2sdev, int in)
{
	struct pcm_info *pi;
	u32 fc;

	get_pcm_info(i2sdev, in, &pi, NULL);

	fc = in_le32(&i2sdev->intfregs->frame_count);
	fc = fc - pi->frame_count;

	if (fc >= pi->substream->runtime->buffer_size)
		fc %= pi->substream->runtime->buffer_size;
	return fc;
}

static inline void handle_interrupt(struct i2sbus_dev *i2sdev, int in)
{
	struct pcm_info *pi;
	u32 fc, nframes;
	u32 status;
	int timeout, i;
	int dma_stopped = 0;
	struct snd_pcm_runtime *runtime;

	spin_lock(&i2sdev->low_lock);
	get_pcm_info(i2sdev, in, &pi, NULL);
	if (!pi->dbdma_ring.running && !pi->dbdma_ring.stopping)
		goto out_unlock;

	i = pi->current_period;
	runtime = pi->substream->runtime;
	while (pi->dbdma_ring.cmds[i].xfer_status) {
		if (le16_to_cpu(pi->dbdma_ring.cmds[i].xfer_status) & BT)
			/*
			 * BT is the branch taken bit.  If it took a branch
			 * it is because we set the S0 bit to make it
			 * branch to the stop command.
			 */
			dma_stopped = 1;
		pi->dbdma_ring.cmds[i].xfer_status = 0;

		if (++i >= runtime->periods) {
			i = 0;
			pi->frame_count += runtime->buffer_size;
		}
		pi->current_period = i;

		/*
		 * Check the frame count.  The DMA tends to get a bit
		 * ahead of the frame counter, which confuses the core.
		 */
		fc = in_le32(&i2sdev->intfregs->frame_count);
		nframes = i * runtime->period_size;
		if (fc < pi->frame_count + nframes)
			pi->frame_count = fc - nframes;
	}

	if (dma_stopped) {
		timeout = 1000;
		for (;;) {
			status = in_le32(&pi->dbdma->status);
			if (!(status & ACTIVE) && (!in || (status & 0x80)))
				break;
			if (--timeout <= 0) {
				printk(KERN_ERR "i2sbus: timed out "
				       "waiting for DMA to stop!\n");
				break;
			}
			udelay(1);
		}

		/* Turn off DMA controller, clear S0 bit */
		out_le32(&pi->dbdma->control, (RUN | PAUSE | 1) << 16);

		pi->dbdma_ring.stopping = 0;
		if (pi->stop_completion)
			complete(pi->stop_completion);
	}

	if (!pi->dbdma_ring.running)
		goto out_unlock;
	spin_unlock(&i2sdev->low_lock);
	/* may call _trigger again, hence needs to be unlocked */
	snd_pcm_period_elapsed(pi->substream);
	return;

 out_unlock:
	spin_unlock(&i2sdev->low_lock);
}

irqreturn_t i2sbus_tx_intr(int irq, void *devid)
{
	handle_interrupt((struct i2sbus_dev *)devid, 0);
	return IRQ_HANDLED;
}

irqreturn_t i2sbus_rx_intr(int irq, void *devid)
{
	handle_interrupt((struct i2sbus_dev *)devid, 1);
	return IRQ_HANDLED;
}

static int i2sbus_playback_open(struct snd_pcm_substream *substream)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);

	if (!i2sdev)
		return -EINVAL;
	i2sdev->out.substream = substream;
	return i2sbus_pcm_open(i2sdev, 0);
}

static int i2sbus_playback_close(struct snd_pcm_substream *substream)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
	int err;

	if (!i2sdev)
		return -EINVAL;
	if (i2sdev->out.substream != substream)
		return -EINVAL;
	err = i2sbus_pcm_close(i2sdev, 0);
	if (!err)
		i2sdev->out.substream = NULL;
	return err;
}

static int i2sbus_playback_prepare(struct snd_pcm_substream *substream)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);

	if (!i2sdev)
		return -EINVAL;
	if (i2sdev->out.substream != substream)
		return -EINVAL;
	return i2sbus_pcm_prepare(i2sdev, 0);
}

static int i2sbus_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);

	if (!i2sdev)
		return -EINVAL;
	if (i2sdev->out.substream != substream)
		return -EINVAL;
	return i2sbus_pcm_trigger(i2sdev, 0, cmd);
}

static snd_pcm_uframes_t i2sbus_playback_pointer(struct snd_pcm_substream
						 *substream)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);

	if (!i2sdev)
		return -EINVAL;
	if (i2sdev->out.substream != substream)
		return 0;
	return i2sbus_pcm_pointer(i2sdev, 0);
}

static struct snd_pcm_ops i2sbus_playback_ops = {
	.open =		i2sbus_playback_open,
	.close =	i2sbus_playback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	i2sbus_hw_params,
	.hw_free =	i2sbus_playback_hw_free,
	.prepare =	i2sbus_playback_prepare,
	.trigger =	i2sbus_playback_trigger,
	.pointer =	i2sbus_playback_pointer,
};

static int i2sbus_record_open(struct snd_pcm_substream *substream)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);

	if (!i2sdev)
		return -EINVAL;
	i2sdev->in.substream = substream;
	return i2sbus_pcm_open(i2sdev, 1);
}

static int i2sbus_record_close(struct snd_pcm_substream *substream)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);
	int err;

	if (!i2sdev)
		return -EINVAL;
	if (i2sdev->in.substream != substream)
		return -EINVAL;
	err = i2sbus_pcm_close(i2sdev, 1);
	if (!err)
		i2sdev->in.substream = NULL;
	return err;
}

static int i2sbus_record_prepare(struct snd_pcm_substream *substream)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);

	if (!i2sdev)
		return -EINVAL;
	if (i2sdev->in.substream != substream)
		return -EINVAL;
	return i2sbus_pcm_prepare(i2sdev, 1);
}

static int i2sbus_record_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);

	if (!i2sdev)
		return -EINVAL;
	if (i2sdev->in.substream != substream)
		return -EINVAL;
	return i2sbus_pcm_trigger(i2sdev, 1, cmd);
}

static snd_pcm_uframes_t i2sbus_record_pointer(struct snd_pcm_substream
					       *substream)
{
	struct i2sbus_dev *i2sdev = snd_pcm_substream_chip(substream);

	if (!i2sdev)
		return -EINVAL;
	if (i2sdev->in.substream != substream)
		return 0;
	return i2sbus_pcm_pointer(i2sdev, 1);
}

static struct snd_pcm_ops i2sbus_record_ops = {
	.open =		i2sbus_record_open,
	.close =	i2sbus_record_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	i2sbus_hw_params,
	.hw_free =	i2sbus_record_hw_free,
	.prepare =	i2sbus_record_prepare,
	.trigger =	i2sbus_record_trigger,
	.pointer =	i2sbus_record_pointer,
};

static void i2sbus_private_free(struct snd_pcm *pcm)
{
	struct i2sbus_dev *i2sdev = snd_pcm_chip(pcm);
	struct codec_info_item *p, *tmp;

	i2sdev->sound.pcm = NULL;
	i2sdev->out.created = 0;
	i2sdev->in.created = 0;
	list_for_each_entry_safe(p, tmp, &i2sdev->sound.codec_list, list) {
		printk(KERN_ERR "i2sbus: a codec didn't unregister!\n");
		list_del(&p->list);
		module_put(p->codec->owner);
		kfree(p);
	}
	soundbus_dev_put(&i2sdev->sound);
	module_put(THIS_MODULE);
}

int
i2sbus_attach_codec(struct soundbus_dev *dev, struct snd_card *card,
		    struct codec_info *ci, void *data)
{
	int err, in = 0, out = 0;
	struct transfer_info *tmp;
	struct i2sbus_dev *i2sdev = soundbus_dev_to_i2sbus_dev(dev);
	struct codec_info_item *cii;

	if (!dev->pcmname || dev->pcmid == -1) {
		printk(KERN_ERR "i2sbus: pcm name and id must be set!\n");
		return -EINVAL;
	}

	list_for_each_entry(cii, &dev->codec_list, list) {
		if (cii->codec_data == data)
			return -EALREADY;
	}

	if (!ci->transfers || !ci->transfers->formats
	    || !ci->transfers->rates || !ci->usable)
		return -EINVAL;

	/* we currently code the i2s transfer on the clock, and support only
	 * 32 and 64 */
	if (ci->bus_factor != 32 && ci->bus_factor != 64)
		return -EINVAL;

	/* If you want to fix this, you need to keep track of what transport infos
	 * are to be used, which codecs they belong to, and then fix all the
	 * sysclock/busclock stuff above to depend on which is usable */
	list_for_each_entry(cii, &dev->codec_list, list) {
		if (cii->codec->sysclock_factor != ci->sysclock_factor) {
			printk(KERN_DEBUG
			       "cannot yet handle multiple different sysclocks!\n");
			return -EINVAL;
		}
		if (cii->codec->bus_factor != ci->bus_factor) {
			printk(KERN_DEBUG
			       "cannot yet handle multiple different bus clocks!\n");
			return -EINVAL;
		}
	}

	tmp = ci->transfers;
	while (tmp->formats && tmp->rates) {
		if (tmp->transfer_in)
			in = 1;
		else
			out = 1;
		tmp++;
	}

	cii = kzalloc(sizeof(struct codec_info_item), GFP_KERNEL);
	if (!cii) {
		printk(KERN_DEBUG "i2sbus: failed to allocate cii\n");
		return -ENOMEM;
	}

	/* use the private data to point to the codec info */
	cii->sdev = soundbus_dev_get(dev);
	cii->codec = ci;
	cii->codec_data = data;

	if (!cii->sdev) {
		printk(KERN_DEBUG
		       "i2sbus: failed to get soundbus dev reference\n");
		err = -ENODEV;
		goto out_free_cii;
	}

	if (!try_module_get(THIS_MODULE)) {
		printk(KERN_DEBUG "i2sbus: failed to get module reference!\n");
		err = -EBUSY;
		goto out_put_sdev;
	}

	if (!try_module_get(ci->owner)) {
		printk(KERN_DEBUG
		       "i2sbus: failed to get module reference to codec owner!\n");
		err = -EBUSY;
		goto out_put_this_module;
	}

	if (!dev->pcm) {
		err = snd_pcm_new(card, dev->pcmname, dev->pcmid, 0, 0,
				  &dev->pcm);
		if (err) {
			printk(KERN_DEBUG "i2sbus: failed to create pcm\n");
			goto out_put_ci_module;
		}
		dev->pcm->dev = &dev->ofdev.dev;
	}

	/* ALSA yet again sucks.
	 * If it is ever fixed, remove this line. See below. */
	out = in = 1;

	if (!i2sdev->out.created && out) {
		if (dev->pcm->card != card) {
			/* eh? */
			printk(KERN_ERR
			       "Can't attach same bus to different cards!\n");
			err = -EINVAL;
			goto out_put_ci_module;
		}
		err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK, 1);
		if (err)
			goto out_put_ci_module;
		snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_PLAYBACK,
				&i2sbus_playback_ops);
		i2sdev->out.created = 1;
	}

	if (!i2sdev->in.created && in) {
		if (dev->pcm->card != card) {
			printk(KERN_ERR
			       "Can't attach same bus to different cards!\n");
			err = -EINVAL;
			goto out_put_ci_module;
		}
		err = snd_pcm_new_stream(dev->pcm, SNDRV_PCM_STREAM_CAPTURE, 1);
		if (err)
			goto out_put_ci_module;
		snd_pcm_set_ops(dev->pcm, SNDRV_PCM_STREAM_CAPTURE,
				&i2sbus_record_ops);
		i2sdev->in.created = 1;
	}

	/* so we have to register the pcm after adding any substream
	 * to it because alsa doesn't create the devices for the
	 * substreams when we add them later.
	 * Therefore, force in and out on both busses (above) and
	 * register the pcm now instead of just after creating it.
	 */
	err = snd_device_register(card, dev->pcm);
	if (err) {
		printk(KERN_ERR "i2sbus: error registering new pcm\n");
		goto out_put_ci_module;
	}
	/* no errors any more, so let's add this to our list */
	list_add(&cii->list, &dev->codec_list);

	dev->pcm->private_data = i2sdev;
	dev->pcm->private_free = i2sbus_private_free;

	/* well, we really should support scatter/gather DMA */
	snd_pcm_lib_preallocate_pages_for_all(
		dev->pcm, SNDRV_DMA_TYPE_DEV,
		snd_dma_pci_data(macio_get_pci_dev(i2sdev->macio)),
		64 * 1024, 64 * 1024);

	return 0;
 out_put_ci_module:
	module_put(ci->owner);
 out_put_this_module:
	module_put(THIS_MODULE);
 out_put_sdev:
	soundbus_dev_put(dev);
 out_free_cii:
	kfree(cii);
	return err;
}

void i2sbus_detach_codec(struct soundbus_dev *dev, void *data)
{
	struct codec_info_item *cii = NULL, *i;

	list_for_each_entry(i, &dev->codec_list, list) {
		if (i->codec_data == data) {
			cii = i;
			break;
		}
	}
	if (cii) {
		list_del(&cii->list);
		module_put(cii->codec->owner);
		kfree(cii);
	}
	/* no more codecs, but still a pcm? */
	if (list_empty(&dev->codec_list) && dev->pcm) {
		/* the actual cleanup is done by the callback above! */
		snd_device_free(dev->pcm->card, dev->pcm);
	}
}
OpenPOWER on IntegriCloud