summaryrefslogtreecommitdiff
path: root/sound/soc/bcm/cygnus-pcm.c
blob: d616e096462e7dac67843023e7951eff1084afa3 (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
/*
 * Copyright (C) 2014-2015 Broadcom Corporation
 *
 * 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 version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/debugfs.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>

#include "cygnus-ssp.h"

/* Register offset needed for ASoC PCM module */

#define INTH_R5F_STATUS_OFFSET     0x040
#define INTH_R5F_CLEAR_OFFSET      0x048
#define INTH_R5F_MASK_SET_OFFSET   0x050
#define INTH_R5F_MASK_CLEAR_OFFSET 0x054

#define BF_REARM_FREE_MARK_OFFSET 0x344
#define BF_REARM_FULL_MARK_OFFSET 0x348

/* Ring Buffer Ctrl Regs --- Start */
/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_RDADDR_REG_BASE */
#define SRC_RBUF_0_RDADDR_OFFSET 0x500
#define SRC_RBUF_1_RDADDR_OFFSET 0x518
#define SRC_RBUF_2_RDADDR_OFFSET 0x530
#define SRC_RBUF_3_RDADDR_OFFSET 0x548
#define SRC_RBUF_4_RDADDR_OFFSET 0x560
#define SRC_RBUF_5_RDADDR_OFFSET 0x578
#define SRC_RBUF_6_RDADDR_OFFSET 0x590

/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_WRADDR_REG_BASE */
#define SRC_RBUF_0_WRADDR_OFFSET 0x504
#define SRC_RBUF_1_WRADDR_OFFSET 0x51c
#define SRC_RBUF_2_WRADDR_OFFSET 0x534
#define SRC_RBUF_3_WRADDR_OFFSET 0x54c
#define SRC_RBUF_4_WRADDR_OFFSET 0x564
#define SRC_RBUF_5_WRADDR_OFFSET 0x57c
#define SRC_RBUF_6_WRADDR_OFFSET 0x594

/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_BASEADDR_REG_BASE */
#define SRC_RBUF_0_BASEADDR_OFFSET 0x508
#define SRC_RBUF_1_BASEADDR_OFFSET 0x520
#define SRC_RBUF_2_BASEADDR_OFFSET 0x538
#define SRC_RBUF_3_BASEADDR_OFFSET 0x550
#define SRC_RBUF_4_BASEADDR_OFFSET 0x568
#define SRC_RBUF_5_BASEADDR_OFFSET 0x580
#define SRC_RBUF_6_BASEADDR_OFFSET 0x598

/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_ENDADDR_REG_BASE */
#define SRC_RBUF_0_ENDADDR_OFFSET 0x50c
#define SRC_RBUF_1_ENDADDR_OFFSET 0x524
#define SRC_RBUF_2_ENDADDR_OFFSET 0x53c
#define SRC_RBUF_3_ENDADDR_OFFSET 0x554
#define SRC_RBUF_4_ENDADDR_OFFSET 0x56c
#define SRC_RBUF_5_ENDADDR_OFFSET 0x584
#define SRC_RBUF_6_ENDADDR_OFFSET 0x59c

/* AUD_FMM_BF_CTRL_SOURCECH_RINGBUF_X_FREE_MARK_REG_BASE */
#define SRC_RBUF_0_FREE_MARK_OFFSET 0x510
#define SRC_RBUF_1_FREE_MARK_OFFSET 0x528
#define SRC_RBUF_2_FREE_MARK_OFFSET 0x540
#define SRC_RBUF_3_FREE_MARK_OFFSET 0x558
#define SRC_RBUF_4_FREE_MARK_OFFSET 0x570
#define SRC_RBUF_5_FREE_MARK_OFFSET 0x588
#define SRC_RBUF_6_FREE_MARK_OFFSET 0x5a0

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_RDADDR_REG_BASE */
#define DST_RBUF_0_RDADDR_OFFSET 0x5c0
#define DST_RBUF_1_RDADDR_OFFSET 0x5d8
#define DST_RBUF_2_RDADDR_OFFSET 0x5f0
#define DST_RBUF_3_RDADDR_OFFSET 0x608
#define DST_RBUF_4_RDADDR_OFFSET 0x620
#define DST_RBUF_5_RDADDR_OFFSET 0x638

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_WRADDR_REG_BASE */
#define DST_RBUF_0_WRADDR_OFFSET 0x5c4
#define DST_RBUF_1_WRADDR_OFFSET 0x5dc
#define DST_RBUF_2_WRADDR_OFFSET 0x5f4
#define DST_RBUF_3_WRADDR_OFFSET 0x60c
#define DST_RBUF_4_WRADDR_OFFSET 0x624
#define DST_RBUF_5_WRADDR_OFFSET 0x63c

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_BASEADDR_REG_BASE */
#define DST_RBUF_0_BASEADDR_OFFSET 0x5c8
#define DST_RBUF_1_BASEADDR_OFFSET 0x5e0
#define DST_RBUF_2_BASEADDR_OFFSET 0x5f8
#define DST_RBUF_3_BASEADDR_OFFSET 0x610
#define DST_RBUF_4_BASEADDR_OFFSET 0x628
#define DST_RBUF_5_BASEADDR_OFFSET 0x640

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_ENDADDR_REG_BASE */
#define DST_RBUF_0_ENDADDR_OFFSET 0x5cc
#define DST_RBUF_1_ENDADDR_OFFSET 0x5e4
#define DST_RBUF_2_ENDADDR_OFFSET 0x5fc
#define DST_RBUF_3_ENDADDR_OFFSET 0x614
#define DST_RBUF_4_ENDADDR_OFFSET 0x62c
#define DST_RBUF_5_ENDADDR_OFFSET 0x644

/* AUD_FMM_BF_CTRL_DESTCH_RINGBUF_X_FULL_MARK_REG_BASE */
#define DST_RBUF_0_FULL_MARK_OFFSET 0x5d0
#define DST_RBUF_1_FULL_MARK_OFFSET 0x5e8
#define DST_RBUF_2_FULL_MARK_OFFSET 0x600
#define DST_RBUF_3_FULL_MARK_OFFSET 0x618
#define DST_RBUF_4_FULL_MARK_OFFSET 0x630
#define DST_RBUF_5_FULL_MARK_OFFSET 0x648
/* Ring Buffer Ctrl Regs --- End */

/* Error Status Regs --- Start */
/* AUD_FMM_BF_ESR_ESRX_STATUS_REG_BASE */
#define ESR0_STATUS_OFFSET 0x900
#define ESR1_STATUS_OFFSET 0x918
#define ESR2_STATUS_OFFSET 0x930
#define ESR3_STATUS_OFFSET 0x948
#define ESR4_STATUS_OFFSET 0x960

/* AUD_FMM_BF_ESR_ESRX_STATUS_CLEAR_REG_BASE */
#define ESR0_STATUS_CLR_OFFSET 0x908
#define ESR1_STATUS_CLR_OFFSET 0x920
#define ESR2_STATUS_CLR_OFFSET 0x938
#define ESR3_STATUS_CLR_OFFSET 0x950
#define ESR4_STATUS_CLR_OFFSET 0x968

/* AUD_FMM_BF_ESR_ESRX_MASK_REG_BASE */
#define ESR0_MASK_STATUS_OFFSET 0x90c
#define ESR1_MASK_STATUS_OFFSET 0x924
#define ESR2_MASK_STATUS_OFFSET 0x93c
#define ESR3_MASK_STATUS_OFFSET 0x954
#define ESR4_MASK_STATUS_OFFSET 0x96c

/* AUD_FMM_BF_ESR_ESRX_MASK_SET_REG_BASE */
#define ESR0_MASK_SET_OFFSET 0x910
#define ESR1_MASK_SET_OFFSET 0x928
#define ESR2_MASK_SET_OFFSET 0x940
#define ESR3_MASK_SET_OFFSET 0x958
#define ESR4_MASK_SET_OFFSET 0x970

/* AUD_FMM_BF_ESR_ESRX_MASK_CLEAR_REG_BASE */
#define ESR0_MASK_CLR_OFFSET 0x914
#define ESR1_MASK_CLR_OFFSET 0x92c
#define ESR2_MASK_CLR_OFFSET 0x944
#define ESR3_MASK_CLR_OFFSET 0x95c
#define ESR4_MASK_CLR_OFFSET 0x974
/* Error Status Regs --- End */

#define R5F_ESR0_SHIFT  0    /* esr0 = fifo underflow */
#define R5F_ESR1_SHIFT  1    /* esr1 = ringbuf underflow */
#define R5F_ESR2_SHIFT  2    /* esr2 = ringbuf overflow */
#define R5F_ESR3_SHIFT  3    /* esr3 = freemark */
#define R5F_ESR4_SHIFT  4    /* esr4 = fullmark */


/* Mask for R5F register.  Set all relevant interrupt for playback handler */
#define ANY_PLAYBACK_IRQ  (BIT(R5F_ESR0_SHIFT) | \
			   BIT(R5F_ESR1_SHIFT) | \
			   BIT(R5F_ESR3_SHIFT))

/* Mask for R5F register.  Set all relevant interrupt for capture handler */
#define ANY_CAPTURE_IRQ   (BIT(R5F_ESR2_SHIFT) | BIT(R5F_ESR4_SHIFT))

/*
 * PERIOD_BYTES_MIN is the number of bytes to at which the interrupt will tick.
 * This number should be a multiple of 256. Minimum value is 256
 */
#define PERIOD_BYTES_MIN 0x100

static const struct snd_pcm_hardware cygnus_pcm_hw = {
	.info = SNDRV_PCM_INFO_MMAP |
			SNDRV_PCM_INFO_MMAP_VALID |
			SNDRV_PCM_INFO_INTERLEAVED,
	.formats = SNDRV_PCM_FMTBIT_S16_LE |
			SNDRV_PCM_FMTBIT_S32_LE,

	/* A period is basically an interrupt */
	.period_bytes_min = PERIOD_BYTES_MIN,
	.period_bytes_max = 0x10000,

	/* period_min/max gives range of approx interrupts per buffer */
	.periods_min = 2,
	.periods_max = 8,

	/*
	 * maximum buffer size in bytes = period_bytes_max * periods_max
	 * We allocate this amount of data for each enabled channel
	 */
	.buffer_bytes_max = 4 * 0x8000,
};

static u64 cygnus_dma_dmamask = DMA_BIT_MASK(32);

static struct cygnus_aio_port *cygnus_dai_get_dma_data(
				struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *soc_runtime = substream->private_data;

	return snd_soc_dai_get_dma_data(soc_runtime->cpu_dai, substream);
}

static void ringbuf_set_initial(void __iomem *audio_io,
		struct ringbuf_regs *p_rbuf,
		bool is_playback,
		u32 start,
		u32 periodsize,
		u32 bufsize)
{
	u32 initial_rd;
	u32 initial_wr;
	u32 end;
	u32 fmark_val; /* free or full mark */

	p_rbuf->period_bytes = periodsize;
	p_rbuf->buf_size = bufsize;

	if (is_playback) {
		/* Set the pointers to indicate full (flip uppermost bit) */
		initial_rd = start;
		initial_wr = initial_rd ^ BIT(31);
	} else {
		/* Set the pointers to indicate empty */
		initial_wr = start;
		initial_rd = initial_wr;
	}

	end = start + bufsize - 1;

	/*
	 * The interrupt will fire when free/full mark is *exceeded*
	 * The fmark value must be multiple of PERIOD_BYTES_MIN so set fmark
	 * to be PERIOD_BYTES_MIN less than the period size.
	 */
	fmark_val = periodsize - PERIOD_BYTES_MIN;

	writel(start, audio_io + p_rbuf->baseaddr);
	writel(end, audio_io + p_rbuf->endaddr);
	writel(fmark_val, audio_io + p_rbuf->fmark);
	writel(initial_rd, audio_io + p_rbuf->rdaddr);
	writel(initial_wr, audio_io + p_rbuf->wraddr);
}

static int configure_ringbuf_regs(struct snd_pcm_substream *substream)
{
	struct cygnus_aio_port *aio;
	struct ringbuf_regs *p_rbuf;
	int status = 0;

	aio = cygnus_dai_get_dma_data(substream);

	/* Map the ssp portnum to a set of ring buffers. */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		p_rbuf = &aio->play_rb_regs;

		switch (aio->portnum) {
		case 0:
			*p_rbuf = RINGBUF_REG_PLAYBACK(0);
			break;
		case 1:
			*p_rbuf = RINGBUF_REG_PLAYBACK(2);
			break;
		case 2:
			*p_rbuf = RINGBUF_REG_PLAYBACK(4);
			break;
		case 3: /* SPDIF */
			*p_rbuf = RINGBUF_REG_PLAYBACK(6);
			break;
		default:
			status = -EINVAL;
		}
	} else {
		p_rbuf = &aio->capture_rb_regs;

		switch (aio->portnum) {
		case 0:
			*p_rbuf = RINGBUF_REG_CAPTURE(0);
			break;
		case 1:
			*p_rbuf = RINGBUF_REG_CAPTURE(2);
			break;
		case 2:
			*p_rbuf = RINGBUF_REG_CAPTURE(4);
			break;
		default:
			status = -EINVAL;
		}
	}

	return status;
}

static struct ringbuf_regs *get_ringbuf(struct snd_pcm_substream *substream)
{
	struct cygnus_aio_port *aio;
	struct ringbuf_regs *p_rbuf = NULL;

	aio = cygnus_dai_get_dma_data(substream);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		p_rbuf = &aio->play_rb_regs;
	else
		p_rbuf = &aio->capture_rb_regs;

	return p_rbuf;
}

static void enable_intr(struct snd_pcm_substream *substream)
{
	struct cygnus_aio_port *aio;
	u32 clear_mask;

	aio = cygnus_dai_get_dma_data(substream);

	/* The port number maps to the bit position to be cleared */
	clear_mask = BIT(aio->portnum);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		/* Clear interrupt status before enabling them */
		writel(clear_mask, aio->cygaud->audio + ESR0_STATUS_CLR_OFFSET);
		writel(clear_mask, aio->cygaud->audio + ESR1_STATUS_CLR_OFFSET);
		writel(clear_mask, aio->cygaud->audio + ESR3_STATUS_CLR_OFFSET);
		/* Unmask the interrupts of the given port*/
		writel(clear_mask, aio->cygaud->audio + ESR0_MASK_CLR_OFFSET);
		writel(clear_mask, aio->cygaud->audio + ESR1_MASK_CLR_OFFSET);
		writel(clear_mask, aio->cygaud->audio + ESR3_MASK_CLR_OFFSET);

		writel(ANY_PLAYBACK_IRQ,
			aio->cygaud->audio + INTH_R5F_MASK_CLEAR_OFFSET);
	} else {
		writel(clear_mask, aio->cygaud->audio + ESR2_STATUS_CLR_OFFSET);
		writel(clear_mask, aio->cygaud->audio + ESR4_STATUS_CLR_OFFSET);
		writel(clear_mask, aio->cygaud->audio + ESR2_MASK_CLR_OFFSET);
		writel(clear_mask, aio->cygaud->audio + ESR4_MASK_CLR_OFFSET);

		writel(ANY_CAPTURE_IRQ,
			aio->cygaud->audio + INTH_R5F_MASK_CLEAR_OFFSET);
	}

}

static void disable_intr(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct cygnus_aio_port *aio;
	u32 set_mask;

	aio = cygnus_dai_get_dma_data(substream);

	dev_dbg(rtd->cpu_dai->dev, "%s on port %d\n", __func__, aio->portnum);

	/* The port number maps to the bit position to be set */
	set_mask = BIT(aio->portnum);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		/* Mask the interrupts of the given port*/
		writel(set_mask, aio->cygaud->audio + ESR0_MASK_SET_OFFSET);
		writel(set_mask, aio->cygaud->audio + ESR1_MASK_SET_OFFSET);
		writel(set_mask, aio->cygaud->audio + ESR3_MASK_SET_OFFSET);
	} else {
		writel(set_mask, aio->cygaud->audio + ESR2_MASK_SET_OFFSET);
		writel(set_mask, aio->cygaud->audio + ESR4_MASK_SET_OFFSET);
	}

}

static int cygnus_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	int ret = 0;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		enable_intr(substream);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		disable_intr(substream);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

static void cygnus_pcm_period_elapsed(struct snd_pcm_substream *substream)
{
	struct cygnus_aio_port *aio;
	struct ringbuf_regs *p_rbuf = NULL;
	u32 regval;

	aio = cygnus_dai_get_dma_data(substream);

	p_rbuf = get_ringbuf(substream);

	/*
	 * If free/full mark interrupt occurs, provide timestamp
	 * to ALSA and update appropriate idx by period_bytes
	 */
	snd_pcm_period_elapsed(substream);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		/* Set the ring buffer to full */
		regval = readl(aio->cygaud->audio + p_rbuf->rdaddr);
		regval = regval ^ BIT(31);
		writel(regval, aio->cygaud->audio + p_rbuf->wraddr);
	} else {
		/* Set the ring buffer to empty */
		regval = readl(aio->cygaud->audio + p_rbuf->wraddr);
		writel(regval, aio->cygaud->audio + p_rbuf->rdaddr);
	}
}

/*
 * ESR0/1/3 status  Description
 *  0x1	I2S0_out port caused interrupt
 *  0x2	I2S1_out port caused interrupt
 *  0x4	I2S2_out port caused interrupt
 *  0x8	SPDIF_out port caused interrupt
 */
static void handle_playback_irq(struct cygnus_audio *cygaud)
{
	void __iomem *audio_io;
	u32 port;
	u32 esr_status0, esr_status1, esr_status3;

	audio_io = cygaud->audio;

	/*
	 * ESR status gets updates with/without interrupts enabled.
	 * So, check the ESR mask, which provides interrupt enable/
	 * disable status and use it to determine which ESR status
	 * should be serviced.
	 */
	esr_status0 = readl(audio_io + ESR0_STATUS_OFFSET);
	esr_status0 &= ~readl(audio_io + ESR0_MASK_STATUS_OFFSET);
	esr_status1 = readl(audio_io + ESR1_STATUS_OFFSET);
	esr_status1 &= ~readl(audio_io + ESR1_MASK_STATUS_OFFSET);
	esr_status3 = readl(audio_io + ESR3_STATUS_OFFSET);
	esr_status3 &= ~readl(audio_io + ESR3_MASK_STATUS_OFFSET);

	for (port = 0; port < CYGNUS_MAX_PLAYBACK_PORTS; port++) {
		u32 esrmask = BIT(port);

		/*
		 * Ringbuffer or FIFO underflow
		 * If we get this interrupt then, it is also true that we have
		 * not yet responded to the freemark interrupt.
		 * Log a debug message.  The freemark handler below will
		 * handle getting everything going again.
		 */
		if ((esrmask & esr_status1) || (esrmask & esr_status0)) {
			dev_dbg(cygaud->dev,
				"Underrun: esr0=0x%x, esr1=0x%x esr3=0x%x\n",
				esr_status0, esr_status1, esr_status3);
		}

		/*
		 * Freemark is hit. This is the normal interrupt.
		 * In typical operation the read and write regs will be equal
		 */
		if (esrmask & esr_status3) {
			struct snd_pcm_substream *playstr;

			playstr = cygaud->portinfo[port].play_stream;
			cygnus_pcm_period_elapsed(playstr);
		}
	}

	/* Clear ESR interrupt */
	writel(esr_status0, audio_io + ESR0_STATUS_CLR_OFFSET);
	writel(esr_status1, audio_io + ESR1_STATUS_CLR_OFFSET);
	writel(esr_status3, audio_io + ESR3_STATUS_CLR_OFFSET);
	/* Rearm freemark logic by writing 1 to the correct bit */
	writel(esr_status3, audio_io + BF_REARM_FREE_MARK_OFFSET);
}

/*
 * ESR2/4 status  Description
 *  0x1	I2S0_in port caused interrupt
 *  0x2	I2S1_in port caused interrupt
 *  0x4	I2S2_in port caused interrupt
 */
static void handle_capture_irq(struct cygnus_audio *cygaud)
{
	void __iomem *audio_io;
	u32 port;
	u32 esr_status2, esr_status4;

	audio_io = cygaud->audio;

	/*
	 * ESR status gets updates with/without interrupts enabled.
	 * So, check the ESR mask, which provides interrupt enable/
	 * disable status and use it to determine which ESR status
	 * should be serviced.
	 */
	esr_status2 = readl(audio_io + ESR2_STATUS_OFFSET);
	esr_status2 &= ~readl(audio_io + ESR2_MASK_STATUS_OFFSET);
	esr_status4 = readl(audio_io + ESR4_STATUS_OFFSET);
	esr_status4 &= ~readl(audio_io + ESR4_MASK_STATUS_OFFSET);

	for (port = 0; port < CYGNUS_MAX_CAPTURE_PORTS; port++) {
		u32 esrmask = BIT(port);

		/*
		 * Ringbuffer or FIFO overflow
		 * If we get this interrupt then, it is also true that we have
		 * not yet responded to the fullmark interrupt.
		 * Log a debug message.  The fullmark handler below will
		 * handle getting everything going again.
		 */
		if (esrmask & esr_status2)
			dev_dbg(cygaud->dev,
				"Overflow: esr2=0x%x\n", esr_status2);

		if (esrmask & esr_status4) {
			struct snd_pcm_substream *capstr;

			capstr = cygaud->portinfo[port].capture_stream;
			cygnus_pcm_period_elapsed(capstr);
		}
	}

	writel(esr_status2, audio_io + ESR2_STATUS_CLR_OFFSET);
	writel(esr_status4, audio_io + ESR4_STATUS_CLR_OFFSET);
	/* Rearm fullmark logic by writing 1 to the correct bit */
	writel(esr_status4, audio_io + BF_REARM_FULL_MARK_OFFSET);
}

static irqreturn_t cygnus_dma_irq(int irq, void *data)
{
	u32 r5_status;
	struct cygnus_audio *cygaud = data;

	/*
	 * R5 status bits	Description
	 *  0		ESR0 (playback FIFO interrupt)
	 *  1		ESR1 (playback rbuf interrupt)
	 *  2		ESR2 (capture rbuf interrupt)
	 *  3		ESR3 (Freemark play. interrupt)
	 *  4		ESR4 (Fullmark capt. interrupt)
	 */
	r5_status = readl(cygaud->audio + INTH_R5F_STATUS_OFFSET);

	if (!(r5_status & (ANY_PLAYBACK_IRQ | ANY_CAPTURE_IRQ)))
		return IRQ_NONE;

	/* If playback interrupt happened */
	if (ANY_PLAYBACK_IRQ & r5_status) {
		handle_playback_irq(cygaud);
		writel(ANY_PLAYBACK_IRQ & r5_status,
			cygaud->audio + INTH_R5F_CLEAR_OFFSET);
	}

	/* If  capture interrupt happened */
	if (ANY_CAPTURE_IRQ & r5_status) {
		handle_capture_irq(cygaud);
		writel(ANY_CAPTURE_IRQ & r5_status,
			cygaud->audio + INTH_R5F_CLEAR_OFFSET);
	}

	return IRQ_HANDLED;
}

static int cygnus_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct cygnus_aio_port *aio;
	int ret;

	aio = cygnus_dai_get_dma_data(substream);
	if (!aio)
		return -ENODEV;

	dev_dbg(rtd->cpu_dai->dev, "%s port %d\n", __func__, aio->portnum);

	snd_soc_set_runtime_hwparams(substream, &cygnus_pcm_hw);

	ret = snd_pcm_hw_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_PERIOD_BYTES, PERIOD_BYTES_MIN);
	if (ret < 0)
		return ret;

	ret = snd_pcm_hw_constraint_step(runtime, 0,
		SNDRV_PCM_HW_PARAM_BUFFER_BYTES, PERIOD_BYTES_MIN);
	if (ret < 0)
		return ret;
	/*
	 * Keep track of which substream belongs to which port.
	 * This info is needed by snd_pcm_period_elapsed() in irq_handler
	 */
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		aio->play_stream = substream;
	else
		aio->capture_stream = substream;

	return 0;
}

static int cygnus_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct cygnus_aio_port *aio;

	aio = cygnus_dai_get_dma_data(substream);

	dev_dbg(rtd->cpu_dai->dev, "%s  port %d\n", __func__, aio->portnum);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		aio->play_stream = NULL;
	else
		aio->capture_stream = NULL;

	if (!aio->play_stream && !aio->capture_stream)
		dev_dbg(rtd->cpu_dai->dev, "freed  port %d\n", aio->portnum);

	return 0;
}

static int cygnus_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct cygnus_aio_port *aio;
	int ret = 0;

	aio = cygnus_dai_get_dma_data(substream);
	dev_dbg(rtd->cpu_dai->dev, "%s  port %d\n", __func__, aio->portnum);

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	runtime->dma_bytes = params_buffer_bytes(params);

	return ret;
}

static int cygnus_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct cygnus_aio_port *aio;

	aio = cygnus_dai_get_dma_data(substream);
	dev_dbg(rtd->cpu_dai->dev, "%s  port %d\n", __func__, aio->portnum);

	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
}

static int cygnus_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct cygnus_aio_port *aio;
	unsigned long bufsize, periodsize;
	int ret = 0;
	bool is_play;
	u32 start;
	struct ringbuf_regs *p_rbuf = NULL;

	aio = cygnus_dai_get_dma_data(substream);
	dev_dbg(rtd->cpu_dai->dev, "%s port %d\n", __func__, aio->portnum);

	bufsize = snd_pcm_lib_buffer_bytes(substream);
	periodsize = snd_pcm_lib_period_bytes(substream);

	dev_dbg(rtd->cpu_dai->dev, "%s (buf_size %lu) (period_size %lu)\n",
			__func__, bufsize, periodsize);

	configure_ringbuf_regs(substream);

	p_rbuf = get_ringbuf(substream);

	start = runtime->dma_addr;

	is_play = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 1 : 0;

	ringbuf_set_initial(aio->cygaud->audio, p_rbuf, is_play, start,
				periodsize, bufsize);

	return ret;
}

static snd_pcm_uframes_t cygnus_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct cygnus_aio_port *aio;
	unsigned int res = 0, cur = 0, base = 0;
	struct ringbuf_regs *p_rbuf = NULL;

	aio = cygnus_dai_get_dma_data(substream);

	/*
	 * Get the offset of the current read (for playack) or write
	 * index (for capture).  Report this value back to the asoc framework.
	 */
	p_rbuf = get_ringbuf(substream);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		cur = readl(aio->cygaud->audio + p_rbuf->rdaddr);
	else
		cur = readl(aio->cygaud->audio + p_rbuf->wraddr);

	base = readl(aio->cygaud->audio + p_rbuf->baseaddr);

	/*
	 * Mask off the MSB of the rdaddr,wraddr and baseaddr
	 * since MSB is not part of the address
	 */
	res = (cur & 0x7fffffff) - (base & 0x7fffffff);

	return bytes_to_frames(substream->runtime, res);
}

static int cygnus_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
	struct snd_pcm_substream *substream = pcm->streams[stream].substream;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_dma_buffer *buf = &substream->dma_buffer;
	size_t size;

	size = cygnus_pcm_hw.buffer_bytes_max;

	buf->dev.type = SNDRV_DMA_TYPE_DEV;
	buf->dev.dev = pcm->card->dev;
	buf->private_data = NULL;
	buf->area = dma_alloc_coherent(pcm->card->dev, size,
			&buf->addr, GFP_KERNEL);

	dev_dbg(rtd->cpu_dai->dev, "%s: size 0x%zx @ %pK\n",
				__func__, size, buf->area);

	if (!buf->area) {
		dev_err(rtd->cpu_dai->dev, "%s: dma_alloc failed\n", __func__);
		return -ENOMEM;
	}
	buf->bytes = size;

	return 0;
}


static const struct snd_pcm_ops cygnus_pcm_ops = {
	.open		= cygnus_pcm_open,
	.close		= cygnus_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= cygnus_pcm_hw_params,
	.hw_free	= cygnus_pcm_hw_free,
	.prepare	= cygnus_pcm_prepare,
	.trigger	= cygnus_pcm_trigger,
	.pointer	= cygnus_pcm_pointer,
};

static void cygnus_dma_free_dma_buffers(struct snd_pcm *pcm)
{
	struct snd_pcm_substream *substream;
	struct snd_dma_buffer *buf;

	substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
	if (substream) {
		buf = &substream->dma_buffer;
		if (buf->area) {
			dma_free_coherent(pcm->card->dev, buf->bytes,
				buf->area, buf->addr);
			buf->area = NULL;
		}
	}

	substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
	if (substream) {
		buf = &substream->dma_buffer;
		if (buf->area) {
			dma_free_coherent(pcm->card->dev, buf->bytes,
				buf->area, buf->addr);
			buf->area = NULL;
		}
	}
}

static int cygnus_dma_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_pcm *pcm = rtd->pcm;
	int ret;

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &cygnus_dma_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);

	if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
		ret = cygnus_pcm_preallocate_dma_buffer(pcm,
				SNDRV_PCM_STREAM_PLAYBACK);
		if (ret)
			return ret;
	}

	if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
		ret = cygnus_pcm_preallocate_dma_buffer(pcm,
				SNDRV_PCM_STREAM_CAPTURE);
		if (ret) {
			cygnus_dma_free_dma_buffers(pcm);
			return ret;
		}
	}

	return 0;
}

static struct snd_soc_platform_driver cygnus_soc_platform = {
	.ops		= &cygnus_pcm_ops,
	.pcm_new	= cygnus_dma_new,
	.pcm_free	= cygnus_dma_free_dma_buffers,
};

int cygnus_soc_platform_register(struct device *dev,
				 struct cygnus_audio *cygaud)
{
	int rc = 0;

	dev_dbg(dev, "%s Enter\n", __func__);

	rc = devm_request_irq(dev, cygaud->irq_num, cygnus_dma_irq,
				IRQF_SHARED, "cygnus-audio", cygaud);
	if (rc) {
		dev_err(dev, "%s request_irq error %d\n", __func__, rc);
		return rc;
	}

	rc = snd_soc_register_platform(dev, &cygnus_soc_platform);
	if (rc) {
		dev_err(dev, "%s failed\n", __func__);
		return rc;
	}

	return 0;
}

int cygnus_soc_platform_unregister(struct device *dev)
{
	snd_soc_unregister_platform(dev);

	return 0;
}

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Broadcom");
MODULE_DESCRIPTION("Cygnus ASoC PCM module");