summaryrefslogtreecommitdiffstats
path: root/sound/soc/sh/rcar/ssi.c
blob: 6cb6db005fc45dd3e562fe480c0e353db7a6116a (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
/*
 * Renesas R-Car SSIU/SSI support
 *
 * Copyright (C) 2013 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * Based on fsi.c
 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/delay.h>
#include "rsnd.h"
#define RSND_SSI_NAME_SIZE 16

/*
 * SSICR
 */
#define	FORCE		(1 << 31)	/* Fixed */
#define	DMEN		(1 << 28)	/* DMA Enable */
#define	UIEN		(1 << 27)	/* Underflow Interrupt Enable */
#define	OIEN		(1 << 26)	/* Overflow Interrupt Enable */
#define	IIEN		(1 << 25)	/* Idle Mode Interrupt Enable */
#define	DIEN		(1 << 24)	/* Data Interrupt Enable */
#define	CHNL_4		(1 << 22)	/* Channels */
#define	CHNL_6		(2 << 22)	/* Channels */
#define	CHNL_8		(3 << 22)	/* Channels */
#define	DWL_8		(0 << 19)	/* Data Word Length */
#define	DWL_16		(1 << 19)	/* Data Word Length */
#define	DWL_18		(2 << 19)	/* Data Word Length */
#define	DWL_20		(3 << 19)	/* Data Word Length */
#define	DWL_22		(4 << 19)	/* Data Word Length */
#define	DWL_24		(5 << 19)	/* Data Word Length */
#define	DWL_32		(6 << 19)	/* Data Word Length */

#define	SWL_32		(3 << 16)	/* R/W System Word Length */
#define	SCKD		(1 << 15)	/* Serial Bit Clock Direction */
#define	SWSD		(1 << 14)	/* Serial WS Direction */
#define	SCKP		(1 << 13)	/* Serial Bit Clock Polarity */
#define	SWSP		(1 << 12)	/* Serial WS Polarity */
#define	SDTA		(1 << 10)	/* Serial Data Alignment */
#define	PDTA		(1 <<  9)	/* Parallel Data Alignment */
#define	DEL		(1 <<  8)	/* Serial Data Delay */
#define	CKDV(v)		(v <<  4)	/* Serial Clock Division Ratio */
#define	TRMD		(1 <<  1)	/* Transmit/Receive Mode Select */
#define	EN		(1 <<  0)	/* SSI Module Enable */

/*
 * SSISR
 */
#define	UIRQ		(1 << 27)	/* Underflow Error Interrupt Status */
#define	OIRQ		(1 << 26)	/* Overflow Error Interrupt Status */
#define	IIRQ		(1 << 25)	/* Idle Mode Interrupt Status */
#define	DIRQ		(1 << 24)	/* Data Interrupt Status Flag */

/*
 * SSIWSR
 */
#define CONT		(1 << 8)	/* WS Continue Function */
#define WS_MODE		(1 << 0)	/* WS Mode */

#define SSI_NAME "ssi"

struct rsnd_ssi {
	struct rsnd_mod mod;
	struct rsnd_mod *dma;

	u32 flags;
	u32 cr_own;
	u32 cr_clk;
	u32 cr_mode;
	u32 wsr;
	int chan;
	int rate;
	int irq;
	unsigned int usrcnt;
};

/* flags */
#define RSND_SSI_CLK_PIN_SHARE		(1 << 0)
#define RSND_SSI_NO_BUSIF		(1 << 1) /* SSI+DMA without BUSIF */

#define for_each_rsnd_ssi(pos, priv, i)					\
	for (i = 0;							\
	     (i < rsnd_ssi_nr(priv)) &&					\
		((pos) = ((struct rsnd_ssi *)(priv)->ssi + i));		\
	     i++)

#define rsnd_ssi_get(priv, id) ((struct rsnd_ssi *)(priv->ssi) + id)
#define rsnd_ssi_to_dma(mod) ((ssi)->dma)
#define rsnd_ssi_nr(priv) ((priv)->ssi_nr)
#define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod)
#define rsnd_ssi_mode_flags(p) ((p)->flags)
#define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io))
#define rsnd_ssi_is_multi_slave(mod, io) \
	(rsnd_ssi_multi_slaves(io) & (1 << rsnd_mod_id(mod)))
#define rsnd_ssi_is_run_mods(mod, io) \
	(rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod)))

int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
{
	struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	int use_busif = 0;

	if (!rsnd_ssi_is_dma_mode(mod))
		return 0;

	if (!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_NO_BUSIF))
		use_busif = 1;
	if (rsnd_io_to_mod_src(io))
		use_busif = 1;

	return use_busif;
}

static void rsnd_ssi_status_clear(struct rsnd_mod *mod)
{
	rsnd_mod_write(mod, SSISR, 0);
}

static u32 rsnd_ssi_status_get(struct rsnd_mod *mod)
{
	return rsnd_mod_read(mod, SSISR);
}

static void rsnd_ssi_status_check(struct rsnd_mod *mod,
				  u32 bit)
{
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	struct device *dev = rsnd_priv_to_dev(priv);
	u32 status;
	int i;

	for (i = 0; i < 1024; i++) {
		status = rsnd_ssi_status_get(mod);
		if (status & bit)
			return;

		udelay(50);
	}

	dev_warn(dev, "%s[%d] status check failed\n",
		 rsnd_mod_name(mod), rsnd_mod_id(mod));
}

static u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io)
{
	struct rsnd_mod *mod;
	enum rsnd_mod_type types[] = {
		RSND_MOD_SSIM1,
		RSND_MOD_SSIM2,
		RSND_MOD_SSIM3,
	};
	int i, mask;

	mask = 0;
	for (i = 0; i < ARRAY_SIZE(types); i++) {
		mod = rsnd_io_to_mod(io, types[i]);
		if (!mod)
			continue;

		mask |= 1 << rsnd_mod_id(mod);
	}

	return mask;
}

static u32 rsnd_ssi_run_mods(struct rsnd_dai_stream *io)
{
	struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
	struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);

	return rsnd_ssi_multi_slaves_runtime(io) |
		1 << rsnd_mod_id(ssi_mod) |
		1 << rsnd_mod_id(ssi_parent_mod);
}

u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io)
{
	if (rsnd_runtime_is_ssi_multi(io))
		return rsnd_ssi_multi_slaves(io);

	return 0;
}

static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod,
				     struct rsnd_dai_stream *io)
{
	struct rsnd_priv *priv = rsnd_io_to_priv(io);
	struct device *dev = rsnd_priv_to_dev(priv);
	struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
	int chan = rsnd_runtime_channel_for_ssi(io);
	int j, ret;
	int ssi_clk_mul_table[] = {
		1, 2, 4, 8, 16, 6, 12,
	};
	unsigned int main_rate;
	unsigned int rate = rsnd_io_is_play(io) ?
		rsnd_src_get_out_rate(priv, io) :
		rsnd_src_get_in_rate(priv, io);

	if (!rsnd_rdai_is_clk_master(rdai))
		return 0;

	if (ssi_parent_mod && !rsnd_ssi_is_parent(mod, io))
		return 0;

	if (rsnd_ssi_is_multi_slave(mod, io))
		return 0;

	if (ssi->usrcnt > 1) {
		if (ssi->rate != rate) {
			dev_err(dev, "SSI parent/child should use same rate\n");
			return -EINVAL;
		}

		return 0;
	}

	/*
	 * Find best clock, and try to start ADG
	 */
	for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) {

		/*
		 * this driver is assuming that
		 * system word is 32bit x chan
		 * see rsnd_ssi_init()
		 */
		main_rate = rate * 32 * chan * ssi_clk_mul_table[j];

		ret = rsnd_adg_ssi_clk_try_start(mod, main_rate);
		if (0 == ret) {
			ssi->cr_clk	= FORCE | SWL_32 |
				SCKD | SWSD | CKDV(j);
			ssi->wsr = CONT;

			ssi->rate = rate;

			dev_dbg(dev, "%s[%d] outputs %u Hz\n",
				rsnd_mod_name(mod),
				rsnd_mod_id(mod), rate);

			return 0;
		}
	}

	dev_err(dev, "unsupported clock rate\n");
	return -EIO;
}

static void rsnd_ssi_master_clk_stop(struct rsnd_mod *mod,
				     struct rsnd_dai_stream *io)
{
	struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);

	if (!rsnd_rdai_is_clk_master(rdai))
		return;

	if (ssi_parent_mod && !rsnd_ssi_is_parent(mod, io))
		return;

	if (ssi->usrcnt > 1)
		return;

	ssi->cr_clk	= 0;
	ssi->rate	= 0;

	rsnd_adg_ssi_clk_stop(mod);
}

static void rsnd_ssi_config_init(struct rsnd_mod *mod,
				struct rsnd_dai_stream *io)
{
	struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	u32 cr_own;
	u32 cr_mode;
	u32 wsr;
	int is_tdm;

	is_tdm = rsnd_runtime_is_ssi_tdm(io);

	/*
	 * always use 32bit system word.
	 * see also rsnd_ssi_master_clk_enable()
	 */
	cr_own = FORCE | SWL_32 | PDTA;

	if (rdai->bit_clk_inv)
		cr_own |= SCKP;
	if (rdai->frm_clk_inv ^ is_tdm)
		cr_own |= SWSP;
	if (rdai->data_alignment)
		cr_own |= SDTA;
	if (rdai->sys_delay)
		cr_own |= DEL;
	if (rsnd_io_is_play(io))
		cr_own |= TRMD;

	switch (runtime->sample_bits) {
	case 16:
		cr_own |= DWL_16;
		break;
	case 32:
		cr_own |= DWL_24;
		break;
	}

	if (rsnd_ssi_is_dma_mode(mod)) {
		cr_mode = UIEN | OIEN |	/* over/under run */
			  DMEN;		/* DMA : enable DMA */
	} else {
		cr_mode = DIEN;		/* PIO : enable Data interrupt */
	}

	/*
	 * TDM Extend Mode
	 * see
	 *	rsnd_ssiu_init_gen2()
	 */
	wsr = ssi->wsr;
	if (is_tdm) {
		wsr	|= WS_MODE;
		cr_own	|= CHNL_8;
	}

	ssi->cr_own	= cr_own;
	ssi->cr_mode	= cr_mode;
	ssi->wsr	= wsr;
}

static void rsnd_ssi_register_setup(struct rsnd_mod *mod)
{
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);

	rsnd_mod_write(mod, SSIWSR,	ssi->wsr);
	rsnd_mod_write(mod, SSICR,	ssi->cr_own	|
					ssi->cr_clk	|
					ssi->cr_mode); /* without EN */
}

/*
 *	SSI mod common functions
 */
static int rsnd_ssi_init(struct rsnd_mod *mod,
			 struct rsnd_dai_stream *io,
			 struct rsnd_priv *priv)
{
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	int ret;

	if (!rsnd_ssi_is_run_mods(mod, io))
		return 0;

	ssi->usrcnt++;

	rsnd_mod_power_on(mod);

	ret = rsnd_ssi_master_clk_start(mod, io);
	if (ret < 0)
		return ret;

	if (!rsnd_ssi_is_parent(mod, io))
		rsnd_ssi_config_init(mod, io);

	rsnd_ssi_register_setup(mod);

	/* clear error status */
	rsnd_ssi_status_clear(mod);

	return 0;
}

static int rsnd_ssi_quit(struct rsnd_mod *mod,
			 struct rsnd_dai_stream *io,
			 struct rsnd_priv *priv)
{
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	struct device *dev = rsnd_priv_to_dev(priv);

	if (!rsnd_ssi_is_run_mods(mod, io))
		return 0;

	if (!ssi->usrcnt) {
		dev_err(dev, "%s[%d] usrcnt error\n",
			rsnd_mod_name(mod), rsnd_mod_id(mod));
		return -EIO;
	}

	if (!rsnd_ssi_is_parent(mod, io))
		ssi->cr_own	= 0;

	rsnd_ssi_master_clk_stop(mod, io);

	rsnd_mod_power_off(mod);

	ssi->usrcnt--;

	return 0;
}

static int rsnd_ssi_hw_params(struct rsnd_mod *mod,
			      struct rsnd_dai_stream *io,
			      struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *params)
{
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	int chan = params_channels(params);

	/*
	 * Already working.
	 * It will happen if SSI has parent/child connection.
	 */
	if (ssi->usrcnt > 1) {
		/*
		 * it is error if child <-> parent SSI uses
		 * different channels.
		 */
		if (ssi->chan != chan)
			return -EIO;
	}

	ssi->chan = chan;

	return 0;
}

static int rsnd_ssi_start(struct rsnd_mod *mod,
			  struct rsnd_dai_stream *io,
			  struct rsnd_priv *priv)
{
	if (!rsnd_ssi_is_run_mods(mod, io))
		return 0;

	/*
	 * EN will be set via SSIU :: SSI_CONTROL
	 * if Multi channel mode
	 */
	if (rsnd_ssi_multi_slaves_runtime(io))
		return 0;

	rsnd_mod_bset(mod, SSICR, EN, EN);

	return 0;
}

static int rsnd_ssi_stop(struct rsnd_mod *mod,
			 struct rsnd_dai_stream *io,
			 struct rsnd_priv *priv)
{
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	u32 cr;

	if (!rsnd_ssi_is_run_mods(mod, io))
		return 0;

	/*
	 * don't stop if not last user
	 * see also
	 *	rsnd_ssi_start
	 *	rsnd_ssi_interrupt
	 */
	if (ssi->usrcnt > 1)
		return 0;

	/*
	 * disable all IRQ,
	 * and, wait all data was sent
	 */
	cr  =	ssi->cr_own	|
		ssi->cr_clk;

	rsnd_mod_write(mod, SSICR, cr | EN);
	rsnd_ssi_status_check(mod, DIRQ);

	/*
	 * disable SSI,
	 * and, wait idle state
	 */
	rsnd_mod_write(mod, SSICR, cr);	/* disabled all */
	rsnd_ssi_status_check(mod, IIRQ);

	return 0;
}

static int rsnd_ssi_irq(struct rsnd_mod *mod,
			struct rsnd_dai_stream *io,
			struct rsnd_priv *priv,
			int enable)
{
	u32 val = 0;

	if (rsnd_is_gen1(priv))
		return 0;

	if (rsnd_ssi_is_parent(mod, io))
		return 0;

	if (!rsnd_ssi_is_run_mods(mod, io))
		return 0;

	if (enable)
		val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000;

	rsnd_mod_write(mod, SSI_INT_ENABLE, val);

	return 0;
}

static void __rsnd_ssi_interrupt(struct rsnd_mod *mod,
				 struct rsnd_dai_stream *io)
{
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	int is_dma = rsnd_ssi_is_dma_mode(mod);
	u32 status;
	bool elapsed = false;
	bool stop = false;

	spin_lock(&priv->lock);

	/* ignore all cases if not working */
	if (!rsnd_io_is_working(io))
		goto rsnd_ssi_interrupt_out;

	status = rsnd_ssi_status_get(mod);

	/* PIO only */
	if (!is_dma && (status & DIRQ)) {
		struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
		u32 *buf = (u32 *)(runtime->dma_area +
				   rsnd_dai_pointer_offset(io, 0));

		/*
		 * 8/16/32 data can be assesse to TDR/RDR register
		 * directly as 32bit data
		 * see rsnd_ssi_init()
		 */
		if (rsnd_io_is_play(io))
			rsnd_mod_write(mod, SSITDR, *buf);
		else
			*buf = rsnd_mod_read(mod, SSIRDR);

		elapsed = rsnd_dai_pointer_update(io, sizeof(*buf));
	}

	/* DMA only */
	if (is_dma && (status & (UIRQ | OIRQ)))
		stop = true;

	rsnd_ssi_status_clear(mod);
rsnd_ssi_interrupt_out:
	spin_unlock(&priv->lock);

	if (elapsed)
		rsnd_dai_period_elapsed(io);

	if (stop)
		snd_pcm_stop_xrun(io->substream);

}

static irqreturn_t rsnd_ssi_interrupt(int irq, void *data)
{
	struct rsnd_mod *mod = data;

	rsnd_mod_interrupt(mod, __rsnd_ssi_interrupt);

	return IRQ_HANDLED;
}

/*
 *		SSI PIO
 */
static void rsnd_ssi_parent_attach(struct rsnd_mod *mod,
				   struct rsnd_dai_stream *io)
{
	struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);

	if (!__rsnd_ssi_is_pin_sharing(mod))
		return;

	if (!rsnd_rdai_is_clk_master(rdai))
		return;

	switch (rsnd_mod_id(mod)) {
	case 1:
	case 2:
		rsnd_dai_connect(rsnd_ssi_mod_get(priv, 0), io, RSND_MOD_SSIP);
		break;
	case 4:
		rsnd_dai_connect(rsnd_ssi_mod_get(priv, 3), io, RSND_MOD_SSIP);
		break;
	case 8:
		rsnd_dai_connect(rsnd_ssi_mod_get(priv, 7), io, RSND_MOD_SSIP);
		break;
	}
}

static int rsnd_ssi_pcm_new(struct rsnd_mod *mod,
			    struct rsnd_dai_stream *io,
			    struct snd_soc_pcm_runtime *rtd)
{
	/*
	 * rsnd_rdai_is_clk_master() will be enabled after set_fmt,
	 * and, pcm_new will be called after it.
	 * This function reuse pcm_new at this point.
	 */
	rsnd_ssi_parent_attach(mod, io);

	return 0;
}

static int rsnd_ssi_common_probe(struct rsnd_mod *mod,
				 struct rsnd_dai_stream *io,
				 struct rsnd_priv *priv)
{
	struct device *dev = rsnd_priv_to_dev(priv);
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	int ret;

	/*
	 * SSIP/SSIU/IRQ are not needed on
	 * SSI Multi slaves
	 */
	if (rsnd_ssi_is_multi_slave(mod, io))
		return 0;

	/*
	 * It can't judge ssi parent at this point
	 * see rsnd_ssi_pcm_new()
	 */

	ret = rsnd_ssiu_attach(io, mod);
	if (ret < 0)
		return ret;

	ret = devm_request_irq(dev, ssi->irq,
			       rsnd_ssi_interrupt,
			       IRQF_SHARED,
			       dev_name(dev), mod);

	return ret;
}

static struct rsnd_mod_ops rsnd_ssi_pio_ops = {
	.name	= SSI_NAME,
	.probe	= rsnd_ssi_common_probe,
	.init	= rsnd_ssi_init,
	.quit	= rsnd_ssi_quit,
	.start	= rsnd_ssi_start,
	.stop	= rsnd_ssi_stop,
	.irq	= rsnd_ssi_irq,
	.pcm_new = rsnd_ssi_pcm_new,
	.hw_params = rsnd_ssi_hw_params,
};

static int rsnd_ssi_dma_probe(struct rsnd_mod *mod,
			      struct rsnd_dai_stream *io,
			      struct rsnd_priv *priv)
{
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	int dma_id = 0; /* not needed */
	int ret;

	/*
	 * SSIP/SSIU/IRQ/DMA are not needed on
	 * SSI Multi slaves
	 */
	if (rsnd_ssi_is_multi_slave(mod, io))
		return 0;

	ret = rsnd_ssi_common_probe(mod, io, priv);
	if (ret)
		return ret;

	/* SSI probe might be called many times in MUX multi path */
	ret = rsnd_dma_attach(io, mod, &ssi->dma, dma_id);

	return ret;
}

static int rsnd_ssi_dma_remove(struct rsnd_mod *mod,
			       struct rsnd_dai_stream *io,
			       struct rsnd_priv *priv)
{
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
	struct device *dev = rsnd_priv_to_dev(priv);
	int irq = ssi->irq;

	/* PIO will request IRQ again */
	devm_free_irq(dev, irq, mod);

	return 0;
}

static int rsnd_ssi_fallback(struct rsnd_mod *mod,
			     struct rsnd_dai_stream *io,
			     struct rsnd_priv *priv)
{
	struct device *dev = rsnd_priv_to_dev(priv);

	/*
	 * fallback to PIO
	 *
	 * SSI .probe might be called again.
	 * see
	 *	rsnd_rdai_continuance_probe()
	 */
	mod->ops = &rsnd_ssi_pio_ops;

	dev_info(dev, "%s[%d] fallback to PIO mode\n",
		 rsnd_mod_name(mod), rsnd_mod_id(mod));

	return 0;
}

static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io,
					 struct rsnd_mod *mod)
{
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	int is_play = rsnd_io_is_play(io);
	char *name;

	if (rsnd_ssi_use_busif(io))
		name = is_play ? "rxu" : "txu";
	else
		name = is_play ? "rx" : "tx";

	return rsnd_dma_request_channel(rsnd_ssi_of_node(priv),
					mod, name);
}

static struct rsnd_mod_ops rsnd_ssi_dma_ops = {
	.name	= SSI_NAME,
	.dma_req = rsnd_ssi_dma_req,
	.probe	= rsnd_ssi_dma_probe,
	.remove	= rsnd_ssi_dma_remove,
	.init	= rsnd_ssi_init,
	.quit	= rsnd_ssi_quit,
	.start	= rsnd_ssi_start,
	.stop	= rsnd_ssi_stop,
	.irq	= rsnd_ssi_irq,
	.pcm_new = rsnd_ssi_pcm_new,
	.fallback = rsnd_ssi_fallback,
	.hw_params = rsnd_ssi_hw_params,
};

int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod)
{
	return mod->ops == &rsnd_ssi_dma_ops;
}


/*
 *		Non SSI
 */
static struct rsnd_mod_ops rsnd_ssi_non_ops = {
	.name	= SSI_NAME,
};

/*
 *		ssi mod function
 */
static void rsnd_ssi_connect(struct rsnd_mod *mod,
			     struct rsnd_dai_stream *io)
{
	struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
	enum rsnd_mod_type types[] = {
		RSND_MOD_SSI,
		RSND_MOD_SSIM1,
		RSND_MOD_SSIM2,
		RSND_MOD_SSIM3,
	};
	enum rsnd_mod_type type;
	int i;

	/* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */
	for (i = 0; i < ARRAY_SIZE(types); i++) {
		type = types[i];
		if (!rsnd_io_to_mod(io, type)) {
			rsnd_dai_connect(mod, io, type);
			rsnd_set_slot(rdai, 2 * (i + 1), (i + 1));
			return;
		}
	}
}

void rsnd_parse_connect_ssi(struct rsnd_dai *rdai,
			    struct device_node *playback,
			    struct device_node *capture)
{
	struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
	struct device_node *node;
	struct device_node *np;
	struct rsnd_mod *mod;
	int i;

	node = rsnd_ssi_of_node(priv);
	if (!node)
		return;

	i = 0;
	for_each_child_of_node(node, np) {
		mod = rsnd_ssi_mod_get(priv, i);
		if (np == playback)
			rsnd_ssi_connect(mod, &rdai->playback);
		if (np == capture)
			rsnd_ssi_connect(mod, &rdai->capture);
		i++;
	}

	of_node_put(node);
}

struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id)
{
	if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv)))
		id = 0;

	return rsnd_mod_get(rsnd_ssi_get(priv, id));
}

int __rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod)
{
	struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);

	return !!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_CLK_PIN_SHARE);
}

static u32 *rsnd_ssi_get_status(struct rsnd_dai_stream *io,
				struct rsnd_mod *mod,
				enum rsnd_mod_type type)
{
	/*
	 * SSIP (= SSI parent) needs to be special, otherwise,
	 * 2nd SSI might doesn't start. see also rsnd_mod_call()
	 *
	 * We can't include parent SSI status on SSI, because we don't know
	 * how many SSI requests parent SSI. Thus, it is localed on "io" now.
	 * ex) trouble case
	 *	Playback: SSI0
	 *	Capture : SSI1 (needs SSI0)
	 *
	 * 1) start Capture  ->	SSI0/SSI1 are started.
	 * 2) start Playback ->	SSI0 doesn't work, because it is already
	 *			marked as "started" on 1)
	 *
	 * OTOH, using each mod's status is good for MUX case.
	 * It doesn't need to start in 2nd start
	 * ex)
	 *	IO-0: SRC0 -> CTU1 -+-> MUX -> DVC -> SSIU -> SSI0
	 *			    |
	 *	IO-1: SRC1 -> CTU2 -+
	 *
	 * 1) start IO-0 ->	start SSI0
	 * 2) start IO-1 ->	SSI0 doesn't need to start, because it is
	 *			already started on 1)
	 */
	if (type == RSND_MOD_SSIP)
		return &io->parent_ssi_status;

	return rsnd_mod_get_status(io, mod, type);
}

int rsnd_ssi_probe(struct rsnd_priv *priv)
{
	struct device_node *node;
	struct device_node *np;
	struct device *dev = rsnd_priv_to_dev(priv);
	struct rsnd_mod_ops *ops;
	struct clk *clk;
	struct rsnd_ssi *ssi;
	char name[RSND_SSI_NAME_SIZE];
	int i, nr, ret;

	node = rsnd_ssi_of_node(priv);
	if (!node)
		return -EINVAL;

	nr = of_get_child_count(node);
	if (!nr) {
		ret = -EINVAL;
		goto rsnd_ssi_probe_done;
	}

	ssi	= devm_kzalloc(dev, sizeof(*ssi) * nr, GFP_KERNEL);
	if (!ssi) {
		ret = -ENOMEM;
		goto rsnd_ssi_probe_done;
	}

	priv->ssi	= ssi;
	priv->ssi_nr	= nr;

	i = 0;
	for_each_child_of_node(node, np) {
		ssi = rsnd_ssi_get(priv, i);

		snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d",
			 SSI_NAME, i);

		clk = devm_clk_get(dev, name);
		if (IS_ERR(clk)) {
			ret = PTR_ERR(clk);
			goto rsnd_ssi_probe_done;
		}

		if (of_get_property(np, "shared-pin", NULL))
			ssi->flags |= RSND_SSI_CLK_PIN_SHARE;

		if (of_get_property(np, "no-busif", NULL))
			ssi->flags |= RSND_SSI_NO_BUSIF;

		ssi->irq = irq_of_parse_and_map(np, 0);
		if (!ssi->irq) {
			ret = -EINVAL;
			goto rsnd_ssi_probe_done;
		}

		ops = &rsnd_ssi_non_ops;
		if (of_property_read_bool(np, "pio-transfer"))
			ops = &rsnd_ssi_pio_ops;
		else
			ops = &rsnd_ssi_dma_ops;

		ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk,
				    rsnd_ssi_get_status, RSND_MOD_SSI, i);
		if (ret)
			goto rsnd_ssi_probe_done;

		i++;
	}

	ret = 0;

rsnd_ssi_probe_done:
	of_node_put(node);

	return ret;
}

void rsnd_ssi_remove(struct rsnd_priv *priv)
{
	struct rsnd_ssi *ssi;
	int i;

	for_each_rsnd_ssi(ssi, priv, i) {
		rsnd_mod_quit(rsnd_mod_get(ssi));
	}
}