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Merge remote-tracking branch 'selinux/next'
[deliverable/linux.git] / sound / soc / sh / rcar / ssi.c
1 /*
2 * Renesas R-Car SSIU/SSI support
3 *
4 * Copyright (C) 2013 Renesas Solutions Corp.
5 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
6 *
7 * Based on fsi.c
8 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14 #include <linux/delay.h>
15 #include "rsnd.h"
16 #define RSND_SSI_NAME_SIZE 16
17
18 /*
19 * SSICR
20 */
21 #define FORCE (1 << 31) /* Fixed */
22 #define DMEN (1 << 28) /* DMA Enable */
23 #define UIEN (1 << 27) /* Underflow Interrupt Enable */
24 #define OIEN (1 << 26) /* Overflow Interrupt Enable */
25 #define IIEN (1 << 25) /* Idle Mode Interrupt Enable */
26 #define DIEN (1 << 24) /* Data Interrupt Enable */
27 #define CHNL_4 (1 << 22) /* Channels */
28 #define CHNL_6 (2 << 22) /* Channels */
29 #define CHNL_8 (3 << 22) /* Channels */
30 #define DWL_8 (0 << 19) /* Data Word Length */
31 #define DWL_16 (1 << 19) /* Data Word Length */
32 #define DWL_18 (2 << 19) /* Data Word Length */
33 #define DWL_20 (3 << 19) /* Data Word Length */
34 #define DWL_22 (4 << 19) /* Data Word Length */
35 #define DWL_24 (5 << 19) /* Data Word Length */
36 #define DWL_32 (6 << 19) /* Data Word Length */
37
38 #define SWL_32 (3 << 16) /* R/W System Word Length */
39 #define SCKD (1 << 15) /* Serial Bit Clock Direction */
40 #define SWSD (1 << 14) /* Serial WS Direction */
41 #define SCKP (1 << 13) /* Serial Bit Clock Polarity */
42 #define SWSP (1 << 12) /* Serial WS Polarity */
43 #define SDTA (1 << 10) /* Serial Data Alignment */
44 #define PDTA (1 << 9) /* Parallel Data Alignment */
45 #define DEL (1 << 8) /* Serial Data Delay */
46 #define CKDV(v) (v << 4) /* Serial Clock Division Ratio */
47 #define TRMD (1 << 1) /* Transmit/Receive Mode Select */
48 #define EN (1 << 0) /* SSI Module Enable */
49
50 /*
51 * SSISR
52 */
53 #define UIRQ (1 << 27) /* Underflow Error Interrupt Status */
54 #define OIRQ (1 << 26) /* Overflow Error Interrupt Status */
55 #define IIRQ (1 << 25) /* Idle Mode Interrupt Status */
56 #define DIRQ (1 << 24) /* Data Interrupt Status Flag */
57
58 /*
59 * SSIWSR
60 */
61 #define CONT (1 << 8) /* WS Continue Function */
62 #define WS_MODE (1 << 0) /* WS Mode */
63
64 #define SSI_NAME "ssi"
65
66 struct rsnd_ssi {
67 struct rsnd_mod mod;
68 struct rsnd_mod *dma;
69
70 u32 flags;
71 u32 cr_own;
72 u32 cr_clk;
73 u32 cr_mode;
74 u32 wsr;
75 int chan;
76 int rate;
77 int irq;
78 unsigned int usrcnt;
79 };
80
81 /* flags */
82 #define RSND_SSI_CLK_PIN_SHARE (1 << 0)
83 #define RSND_SSI_NO_BUSIF (1 << 1) /* SSI+DMA without BUSIF */
84
85 #define for_each_rsnd_ssi(pos, priv, i) \
86 for (i = 0; \
87 (i < rsnd_ssi_nr(priv)) && \
88 ((pos) = ((struct rsnd_ssi *)(priv)->ssi + i)); \
89 i++)
90
91 #define rsnd_ssi_get(priv, id) ((struct rsnd_ssi *)(priv->ssi) + id)
92 #define rsnd_ssi_to_dma(mod) ((ssi)->dma)
93 #define rsnd_ssi_nr(priv) ((priv)->ssi_nr)
94 #define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod)
95 #define rsnd_ssi_mode_flags(p) ((p)->flags)
96 #define rsnd_ssi_is_parent(ssi, io) ((ssi) == rsnd_io_to_mod_ssip(io))
97 #define rsnd_ssi_is_multi_slave(mod, io) \
98 (rsnd_ssi_multi_slaves(io) & (1 << rsnd_mod_id(mod)))
99 #define rsnd_ssi_is_run_mods(mod, io) \
100 (rsnd_ssi_run_mods(io) & (1 << rsnd_mod_id(mod)))
101
102 int rsnd_ssi_use_busif(struct rsnd_dai_stream *io)
103 {
104 struct rsnd_mod *mod = rsnd_io_to_mod_ssi(io);
105 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
106 int use_busif = 0;
107
108 if (!rsnd_ssi_is_dma_mode(mod))
109 return 0;
110
111 if (!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_NO_BUSIF))
112 use_busif = 1;
113 if (rsnd_io_to_mod_src(io))
114 use_busif = 1;
115
116 return use_busif;
117 }
118
119 static void rsnd_ssi_status_clear(struct rsnd_mod *mod)
120 {
121 rsnd_mod_write(mod, SSISR, 0);
122 }
123
124 static u32 rsnd_ssi_status_get(struct rsnd_mod *mod)
125 {
126 return rsnd_mod_read(mod, SSISR);
127 }
128
129 static void rsnd_ssi_status_check(struct rsnd_mod *mod,
130 u32 bit)
131 {
132 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
133 struct device *dev = rsnd_priv_to_dev(priv);
134 u32 status;
135 int i;
136
137 for (i = 0; i < 1024; i++) {
138 status = rsnd_ssi_status_get(mod);
139 if (status & bit)
140 return;
141
142 udelay(50);
143 }
144
145 dev_warn(dev, "%s[%d] status check failed\n",
146 rsnd_mod_name(mod), rsnd_mod_id(mod));
147 }
148
149 static u32 rsnd_ssi_multi_slaves(struct rsnd_dai_stream *io)
150 {
151 struct rsnd_mod *mod;
152 enum rsnd_mod_type types[] = {
153 RSND_MOD_SSIM1,
154 RSND_MOD_SSIM2,
155 RSND_MOD_SSIM3,
156 };
157 int i, mask;
158
159 mask = 0;
160 for (i = 0; i < ARRAY_SIZE(types); i++) {
161 mod = rsnd_io_to_mod(io, types[i]);
162 if (!mod)
163 continue;
164
165 mask |= 1 << rsnd_mod_id(mod);
166 }
167
168 return mask;
169 }
170
171 static u32 rsnd_ssi_run_mods(struct rsnd_dai_stream *io)
172 {
173 struct rsnd_mod *ssi_mod = rsnd_io_to_mod_ssi(io);
174 struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
175
176 return rsnd_ssi_multi_slaves_runtime(io) |
177 1 << rsnd_mod_id(ssi_mod) |
178 1 << rsnd_mod_id(ssi_parent_mod);
179 }
180
181 u32 rsnd_ssi_multi_slaves_runtime(struct rsnd_dai_stream *io)
182 {
183 if (rsnd_runtime_is_ssi_multi(io))
184 return rsnd_ssi_multi_slaves(io);
185
186 return 0;
187 }
188
189 static int rsnd_ssi_master_clk_start(struct rsnd_mod *mod,
190 struct rsnd_dai_stream *io)
191 {
192 struct rsnd_priv *priv = rsnd_io_to_priv(io);
193 struct device *dev = rsnd_priv_to_dev(priv);
194 struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
195 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
196 struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
197 int chan = rsnd_runtime_channel_for_ssi(io);
198 int j, ret;
199 int ssi_clk_mul_table[] = {
200 1, 2, 4, 8, 16, 6, 12,
201 };
202 unsigned int main_rate;
203 unsigned int rate = rsnd_io_is_play(io) ?
204 rsnd_src_get_out_rate(priv, io) :
205 rsnd_src_get_in_rate(priv, io);
206
207 if (!rsnd_rdai_is_clk_master(rdai))
208 return 0;
209
210 if (ssi_parent_mod && !rsnd_ssi_is_parent(mod, io))
211 return 0;
212
213 if (rsnd_ssi_is_multi_slave(mod, io))
214 return 0;
215
216 if (ssi->usrcnt > 1) {
217 if (ssi->rate != rate) {
218 dev_err(dev, "SSI parent/child should use same rate\n");
219 return -EINVAL;
220 }
221
222 return 0;
223 }
224
225 /*
226 * Find best clock, and try to start ADG
227 */
228 for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) {
229
230 /*
231 * this driver is assuming that
232 * system word is 32bit x chan
233 * see rsnd_ssi_init()
234 */
235 main_rate = rate * 32 * chan * ssi_clk_mul_table[j];
236
237 ret = rsnd_adg_ssi_clk_try_start(mod, main_rate);
238 if (0 == ret) {
239 ssi->cr_clk = FORCE | SWL_32 |
240 SCKD | SWSD | CKDV(j);
241 ssi->wsr = CONT;
242
243 ssi->rate = rate;
244
245 dev_dbg(dev, "%s[%d] outputs %u Hz\n",
246 rsnd_mod_name(mod),
247 rsnd_mod_id(mod), rate);
248
249 return 0;
250 }
251 }
252
253 dev_err(dev, "unsupported clock rate\n");
254 return -EIO;
255 }
256
257 static void rsnd_ssi_master_clk_stop(struct rsnd_mod *mod,
258 struct rsnd_dai_stream *io)
259 {
260 struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
261 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
262 struct rsnd_mod *ssi_parent_mod = rsnd_io_to_mod_ssip(io);
263
264 if (!rsnd_rdai_is_clk_master(rdai))
265 return;
266
267 if (ssi_parent_mod && !rsnd_ssi_is_parent(mod, io))
268 return;
269
270 if (ssi->usrcnt > 1)
271 return;
272
273 ssi->cr_clk = 0;
274 ssi->rate = 0;
275
276 rsnd_adg_ssi_clk_stop(mod);
277 }
278
279 static void rsnd_ssi_config_init(struct rsnd_mod *mod,
280 struct rsnd_dai_stream *io)
281 {
282 struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
283 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
284 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
285 u32 cr_own;
286 u32 cr_mode;
287 u32 wsr;
288 int is_tdm;
289
290 is_tdm = rsnd_runtime_is_ssi_tdm(io);
291
292 /*
293 * always use 32bit system word.
294 * see also rsnd_ssi_master_clk_enable()
295 */
296 cr_own = FORCE | SWL_32 | PDTA;
297
298 if (rdai->bit_clk_inv)
299 cr_own |= SCKP;
300 if (rdai->frm_clk_inv ^ is_tdm)
301 cr_own |= SWSP;
302 if (rdai->data_alignment)
303 cr_own |= SDTA;
304 if (rdai->sys_delay)
305 cr_own |= DEL;
306 if (rsnd_io_is_play(io))
307 cr_own |= TRMD;
308
309 switch (runtime->sample_bits) {
310 case 16:
311 cr_own |= DWL_16;
312 break;
313 case 32:
314 cr_own |= DWL_24;
315 break;
316 }
317
318 if (rsnd_ssi_is_dma_mode(mod)) {
319 cr_mode = UIEN | OIEN | /* over/under run */
320 DMEN; /* DMA : enable DMA */
321 } else {
322 cr_mode = DIEN; /* PIO : enable Data interrupt */
323 }
324
325 /*
326 * TDM Extend Mode
327 * see
328 * rsnd_ssiu_init_gen2()
329 */
330 wsr = ssi->wsr;
331 if (is_tdm) {
332 wsr |= WS_MODE;
333 cr_own |= CHNL_8;
334 }
335
336 ssi->cr_own = cr_own;
337 ssi->cr_mode = cr_mode;
338 ssi->wsr = wsr;
339 }
340
341 static void rsnd_ssi_register_setup(struct rsnd_mod *mod)
342 {
343 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
344
345 rsnd_mod_write(mod, SSIWSR, ssi->wsr);
346 rsnd_mod_write(mod, SSICR, ssi->cr_own |
347 ssi->cr_clk |
348 ssi->cr_mode); /* without EN */
349 }
350
351 /*
352 * SSI mod common functions
353 */
354 static int rsnd_ssi_init(struct rsnd_mod *mod,
355 struct rsnd_dai_stream *io,
356 struct rsnd_priv *priv)
357 {
358 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
359 int ret;
360
361 if (!rsnd_ssi_is_run_mods(mod, io))
362 return 0;
363
364 ssi->usrcnt++;
365
366 rsnd_mod_power_on(mod);
367
368 ret = rsnd_ssi_master_clk_start(mod, io);
369 if (ret < 0)
370 return ret;
371
372 if (!rsnd_ssi_is_parent(mod, io))
373 rsnd_ssi_config_init(mod, io);
374
375 rsnd_ssi_register_setup(mod);
376
377 /* clear error status */
378 rsnd_ssi_status_clear(mod);
379
380 return 0;
381 }
382
383 static int rsnd_ssi_quit(struct rsnd_mod *mod,
384 struct rsnd_dai_stream *io,
385 struct rsnd_priv *priv)
386 {
387 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
388 struct device *dev = rsnd_priv_to_dev(priv);
389
390 if (!rsnd_ssi_is_run_mods(mod, io))
391 return 0;
392
393 if (!ssi->usrcnt) {
394 dev_err(dev, "%s[%d] usrcnt error\n",
395 rsnd_mod_name(mod), rsnd_mod_id(mod));
396 return -EIO;
397 }
398
399 if (!rsnd_ssi_is_parent(mod, io))
400 ssi->cr_own = 0;
401
402 rsnd_ssi_master_clk_stop(mod, io);
403
404 rsnd_mod_power_off(mod);
405
406 ssi->usrcnt--;
407
408 return 0;
409 }
410
411 static int rsnd_ssi_hw_params(struct rsnd_mod *mod,
412 struct rsnd_dai_stream *io,
413 struct snd_pcm_substream *substream,
414 struct snd_pcm_hw_params *params)
415 {
416 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
417 int chan = params_channels(params);
418
419 /*
420 * Already working.
421 * It will happen if SSI has parent/child connection.
422 */
423 if (ssi->usrcnt > 1) {
424 /*
425 * it is error if child <-> parent SSI uses
426 * different channels.
427 */
428 if (ssi->chan != chan)
429 return -EIO;
430 }
431
432 ssi->chan = chan;
433
434 return 0;
435 }
436
437 static int rsnd_ssi_start(struct rsnd_mod *mod,
438 struct rsnd_dai_stream *io,
439 struct rsnd_priv *priv)
440 {
441 if (!rsnd_ssi_is_run_mods(mod, io))
442 return 0;
443
444 /*
445 * EN will be set via SSIU :: SSI_CONTROL
446 * if Multi channel mode
447 */
448 if (rsnd_ssi_multi_slaves_runtime(io))
449 return 0;
450
451 rsnd_mod_bset(mod, SSICR, EN, EN);
452
453 return 0;
454 }
455
456 static int rsnd_ssi_stop(struct rsnd_mod *mod,
457 struct rsnd_dai_stream *io,
458 struct rsnd_priv *priv)
459 {
460 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
461 u32 cr;
462
463 if (!rsnd_ssi_is_run_mods(mod, io))
464 return 0;
465
466 /*
467 * don't stop if not last user
468 * see also
469 * rsnd_ssi_start
470 * rsnd_ssi_interrupt
471 */
472 if (ssi->usrcnt > 1)
473 return 0;
474
475 /*
476 * disable all IRQ,
477 * and, wait all data was sent
478 */
479 cr = ssi->cr_own |
480 ssi->cr_clk;
481
482 rsnd_mod_write(mod, SSICR, cr | EN);
483 rsnd_ssi_status_check(mod, DIRQ);
484
485 /*
486 * disable SSI,
487 * and, wait idle state
488 */
489 rsnd_mod_write(mod, SSICR, cr); /* disabled all */
490 rsnd_ssi_status_check(mod, IIRQ);
491
492 return 0;
493 }
494
495 static int rsnd_ssi_irq(struct rsnd_mod *mod,
496 struct rsnd_dai_stream *io,
497 struct rsnd_priv *priv,
498 int enable)
499 {
500 u32 val = 0;
501
502 if (rsnd_is_gen1(priv))
503 return 0;
504
505 if (rsnd_ssi_is_parent(mod, io))
506 return 0;
507
508 if (!rsnd_ssi_is_run_mods(mod, io))
509 return 0;
510
511 if (enable)
512 val = rsnd_ssi_is_dma_mode(mod) ? 0x0e000000 : 0x0f000000;
513
514 rsnd_mod_write(mod, SSI_INT_ENABLE, val);
515
516 return 0;
517 }
518
519 static void __rsnd_ssi_interrupt(struct rsnd_mod *mod,
520 struct rsnd_dai_stream *io)
521 {
522 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
523 int is_dma = rsnd_ssi_is_dma_mode(mod);
524 u32 status;
525 bool elapsed = false;
526 bool stop = false;
527
528 spin_lock(&priv->lock);
529
530 /* ignore all cases if not working */
531 if (!rsnd_io_is_working(io))
532 goto rsnd_ssi_interrupt_out;
533
534 status = rsnd_ssi_status_get(mod);
535
536 /* PIO only */
537 if (!is_dma && (status & DIRQ)) {
538 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
539 u32 *buf = (u32 *)(runtime->dma_area +
540 rsnd_dai_pointer_offset(io, 0));
541
542 /*
543 * 8/16/32 data can be assesse to TDR/RDR register
544 * directly as 32bit data
545 * see rsnd_ssi_init()
546 */
547 if (rsnd_io_is_play(io))
548 rsnd_mod_write(mod, SSITDR, *buf);
549 else
550 *buf = rsnd_mod_read(mod, SSIRDR);
551
552 elapsed = rsnd_dai_pointer_update(io, sizeof(*buf));
553 }
554
555 /* DMA only */
556 if (is_dma && (status & (UIRQ | OIRQ)))
557 stop = true;
558
559 rsnd_ssi_status_clear(mod);
560 rsnd_ssi_interrupt_out:
561 spin_unlock(&priv->lock);
562
563 if (elapsed)
564 rsnd_dai_period_elapsed(io);
565
566 if (stop)
567 snd_pcm_stop_xrun(io->substream);
568
569 }
570
571 static irqreturn_t rsnd_ssi_interrupt(int irq, void *data)
572 {
573 struct rsnd_mod *mod = data;
574
575 rsnd_mod_interrupt(mod, __rsnd_ssi_interrupt);
576
577 return IRQ_HANDLED;
578 }
579
580 /*
581 * SSI PIO
582 */
583 static void rsnd_ssi_parent_attach(struct rsnd_mod *mod,
584 struct rsnd_dai_stream *io)
585 {
586 struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
587 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
588
589 if (!__rsnd_ssi_is_pin_sharing(mod))
590 return;
591
592 if (!rsnd_rdai_is_clk_master(rdai))
593 return;
594
595 switch (rsnd_mod_id(mod)) {
596 case 1:
597 case 2:
598 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 0), io, RSND_MOD_SSIP);
599 break;
600 case 4:
601 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 3), io, RSND_MOD_SSIP);
602 break;
603 case 8:
604 rsnd_dai_connect(rsnd_ssi_mod_get(priv, 7), io, RSND_MOD_SSIP);
605 break;
606 }
607 }
608
609 static int rsnd_ssi_pcm_new(struct rsnd_mod *mod,
610 struct rsnd_dai_stream *io,
611 struct snd_soc_pcm_runtime *rtd)
612 {
613 /*
614 * rsnd_rdai_is_clk_master() will be enabled after set_fmt,
615 * and, pcm_new will be called after it.
616 * This function reuse pcm_new at this point.
617 */
618 rsnd_ssi_parent_attach(mod, io);
619
620 return 0;
621 }
622
623 static int rsnd_ssi_common_probe(struct rsnd_mod *mod,
624 struct rsnd_dai_stream *io,
625 struct rsnd_priv *priv)
626 {
627 struct device *dev = rsnd_priv_to_dev(priv);
628 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
629 int ret;
630
631 /*
632 * SSIP/SSIU/IRQ are not needed on
633 * SSI Multi slaves
634 */
635 if (rsnd_ssi_is_multi_slave(mod, io))
636 return 0;
637
638 /*
639 * It can't judge ssi parent at this point
640 * see rsnd_ssi_pcm_new()
641 */
642
643 ret = rsnd_ssiu_attach(io, mod);
644 if (ret < 0)
645 return ret;
646
647 ret = devm_request_irq(dev, ssi->irq,
648 rsnd_ssi_interrupt,
649 IRQF_SHARED,
650 dev_name(dev), mod);
651
652 return ret;
653 }
654
655 static struct rsnd_mod_ops rsnd_ssi_pio_ops = {
656 .name = SSI_NAME,
657 .probe = rsnd_ssi_common_probe,
658 .init = rsnd_ssi_init,
659 .quit = rsnd_ssi_quit,
660 .start = rsnd_ssi_start,
661 .stop = rsnd_ssi_stop,
662 .irq = rsnd_ssi_irq,
663 .pcm_new = rsnd_ssi_pcm_new,
664 .hw_params = rsnd_ssi_hw_params,
665 };
666
667 static int rsnd_ssi_dma_probe(struct rsnd_mod *mod,
668 struct rsnd_dai_stream *io,
669 struct rsnd_priv *priv)
670 {
671 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
672 int dma_id = 0; /* not needed */
673 int ret;
674
675 /*
676 * SSIP/SSIU/IRQ/DMA are not needed on
677 * SSI Multi slaves
678 */
679 if (rsnd_ssi_is_multi_slave(mod, io))
680 return 0;
681
682 ret = rsnd_ssi_common_probe(mod, io, priv);
683 if (ret)
684 return ret;
685
686 /* SSI probe might be called many times in MUX multi path */
687 ret = rsnd_dma_attach(io, mod, &ssi->dma, dma_id);
688
689 return ret;
690 }
691
692 static int rsnd_ssi_dma_remove(struct rsnd_mod *mod,
693 struct rsnd_dai_stream *io,
694 struct rsnd_priv *priv)
695 {
696 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
697 struct device *dev = rsnd_priv_to_dev(priv);
698 int irq = ssi->irq;
699
700 /* PIO will request IRQ again */
701 devm_free_irq(dev, irq, mod);
702
703 return 0;
704 }
705
706 static int rsnd_ssi_fallback(struct rsnd_mod *mod,
707 struct rsnd_dai_stream *io,
708 struct rsnd_priv *priv)
709 {
710 struct device *dev = rsnd_priv_to_dev(priv);
711
712 /*
713 * fallback to PIO
714 *
715 * SSI .probe might be called again.
716 * see
717 * rsnd_rdai_continuance_probe()
718 */
719 mod->ops = &rsnd_ssi_pio_ops;
720
721 dev_info(dev, "%s[%d] fallback to PIO mode\n",
722 rsnd_mod_name(mod), rsnd_mod_id(mod));
723
724 return 0;
725 }
726
727 static struct dma_chan *rsnd_ssi_dma_req(struct rsnd_dai_stream *io,
728 struct rsnd_mod *mod)
729 {
730 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
731 int is_play = rsnd_io_is_play(io);
732 char *name;
733
734 if (rsnd_ssi_use_busif(io))
735 name = is_play ? "rxu" : "txu";
736 else
737 name = is_play ? "rx" : "tx";
738
739 return rsnd_dma_request_channel(rsnd_ssi_of_node(priv),
740 mod, name);
741 }
742
743 static struct rsnd_mod_ops rsnd_ssi_dma_ops = {
744 .name = SSI_NAME,
745 .dma_req = rsnd_ssi_dma_req,
746 .probe = rsnd_ssi_dma_probe,
747 .remove = rsnd_ssi_dma_remove,
748 .init = rsnd_ssi_init,
749 .quit = rsnd_ssi_quit,
750 .start = rsnd_ssi_start,
751 .stop = rsnd_ssi_stop,
752 .irq = rsnd_ssi_irq,
753 .pcm_new = rsnd_ssi_pcm_new,
754 .fallback = rsnd_ssi_fallback,
755 .hw_params = rsnd_ssi_hw_params,
756 };
757
758 int rsnd_ssi_is_dma_mode(struct rsnd_mod *mod)
759 {
760 return mod->ops == &rsnd_ssi_dma_ops;
761 }
762
763
764 /*
765 * Non SSI
766 */
767 static struct rsnd_mod_ops rsnd_ssi_non_ops = {
768 .name = SSI_NAME,
769 };
770
771 /*
772 * ssi mod function
773 */
774 static void rsnd_ssi_connect(struct rsnd_mod *mod,
775 struct rsnd_dai_stream *io)
776 {
777 struct rsnd_dai *rdai = rsnd_io_to_rdai(io);
778 enum rsnd_mod_type types[] = {
779 RSND_MOD_SSI,
780 RSND_MOD_SSIM1,
781 RSND_MOD_SSIM2,
782 RSND_MOD_SSIM3,
783 };
784 enum rsnd_mod_type type;
785 int i;
786
787 /* try SSI -> SSIM1 -> SSIM2 -> SSIM3 */
788 for (i = 0; i < ARRAY_SIZE(types); i++) {
789 type = types[i];
790 if (!rsnd_io_to_mod(io, type)) {
791 rsnd_dai_connect(mod, io, type);
792 rsnd_set_slot(rdai, 2 * (i + 1), (i + 1));
793 return;
794 }
795 }
796 }
797
798 void rsnd_parse_connect_ssi(struct rsnd_dai *rdai,
799 struct device_node *playback,
800 struct device_node *capture)
801 {
802 struct rsnd_priv *priv = rsnd_rdai_to_priv(rdai);
803 struct device_node *node;
804 struct device_node *np;
805 struct rsnd_mod *mod;
806 int i;
807
808 node = rsnd_ssi_of_node(priv);
809 if (!node)
810 return;
811
812 i = 0;
813 for_each_child_of_node(node, np) {
814 mod = rsnd_ssi_mod_get(priv, i);
815 if (np == playback)
816 rsnd_ssi_connect(mod, &rdai->playback);
817 if (np == capture)
818 rsnd_ssi_connect(mod, &rdai->capture);
819 i++;
820 }
821
822 of_node_put(node);
823 }
824
825 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id)
826 {
827 if (WARN_ON(id < 0 || id >= rsnd_ssi_nr(priv)))
828 id = 0;
829
830 return rsnd_mod_get(rsnd_ssi_get(priv, id));
831 }
832
833 int __rsnd_ssi_is_pin_sharing(struct rsnd_mod *mod)
834 {
835 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
836
837 return !!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_CLK_PIN_SHARE);
838 }
839
840 static u32 *rsnd_ssi_get_status(struct rsnd_dai_stream *io,
841 struct rsnd_mod *mod,
842 enum rsnd_mod_type type)
843 {
844 /*
845 * SSIP (= SSI parent) needs to be special, otherwise,
846 * 2nd SSI might doesn't start. see also rsnd_mod_call()
847 *
848 * We can't include parent SSI status on SSI, because we don't know
849 * how many SSI requests parent SSI. Thus, it is localed on "io" now.
850 * ex) trouble case
851 * Playback: SSI0
852 * Capture : SSI1 (needs SSI0)
853 *
854 * 1) start Capture -> SSI0/SSI1 are started.
855 * 2) start Playback -> SSI0 doesn't work, because it is already
856 * marked as "started" on 1)
857 *
858 * OTOH, using each mod's status is good for MUX case.
859 * It doesn't need to start in 2nd start
860 * ex)
861 * IO-0: SRC0 -> CTU1 -+-> MUX -> DVC -> SSIU -> SSI0
862 * |
863 * IO-1: SRC1 -> CTU2 -+
864 *
865 * 1) start IO-0 -> start SSI0
866 * 2) start IO-1 -> SSI0 doesn't need to start, because it is
867 * already started on 1)
868 */
869 if (type == RSND_MOD_SSIP)
870 return &io->parent_ssi_status;
871
872 return rsnd_mod_get_status(io, mod, type);
873 }
874
875 int rsnd_ssi_probe(struct rsnd_priv *priv)
876 {
877 struct device_node *node;
878 struct device_node *np;
879 struct device *dev = rsnd_priv_to_dev(priv);
880 struct rsnd_mod_ops *ops;
881 struct clk *clk;
882 struct rsnd_ssi *ssi;
883 char name[RSND_SSI_NAME_SIZE];
884 int i, nr, ret;
885
886 node = rsnd_ssi_of_node(priv);
887 if (!node)
888 return -EINVAL;
889
890 nr = of_get_child_count(node);
891 if (!nr) {
892 ret = -EINVAL;
893 goto rsnd_ssi_probe_done;
894 }
895
896 ssi = devm_kzalloc(dev, sizeof(*ssi) * nr, GFP_KERNEL);
897 if (!ssi) {
898 ret = -ENOMEM;
899 goto rsnd_ssi_probe_done;
900 }
901
902 priv->ssi = ssi;
903 priv->ssi_nr = nr;
904
905 i = 0;
906 for_each_child_of_node(node, np) {
907 ssi = rsnd_ssi_get(priv, i);
908
909 snprintf(name, RSND_SSI_NAME_SIZE, "%s.%d",
910 SSI_NAME, i);
911
912 clk = devm_clk_get(dev, name);
913 if (IS_ERR(clk)) {
914 ret = PTR_ERR(clk);
915 goto rsnd_ssi_probe_done;
916 }
917
918 if (of_get_property(np, "shared-pin", NULL))
919 ssi->flags |= RSND_SSI_CLK_PIN_SHARE;
920
921 if (of_get_property(np, "no-busif", NULL))
922 ssi->flags |= RSND_SSI_NO_BUSIF;
923
924 ssi->irq = irq_of_parse_and_map(np, 0);
925 if (!ssi->irq) {
926 ret = -EINVAL;
927 goto rsnd_ssi_probe_done;
928 }
929
930 ops = &rsnd_ssi_non_ops;
931 if (of_property_read_bool(np, "pio-transfer"))
932 ops = &rsnd_ssi_pio_ops;
933 else
934 ops = &rsnd_ssi_dma_ops;
935
936 ret = rsnd_mod_init(priv, rsnd_mod_get(ssi), ops, clk,
937 rsnd_ssi_get_status, RSND_MOD_SSI, i);
938 if (ret)
939 goto rsnd_ssi_probe_done;
940
941 i++;
942 }
943
944 ret = 0;
945
946 rsnd_ssi_probe_done:
947 of_node_put(node);
948
949 return ret;
950 }
951
952 void rsnd_ssi_remove(struct rsnd_priv *priv)
953 {
954 struct rsnd_ssi *ssi;
955 int i;
956
957 for_each_rsnd_ssi(ssi, priv, i) {
958 rsnd_mod_quit(rsnd_mod_get(ssi));
959 }
960 }
Linux kernel - Deliverables
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