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ASoC: rsnd: add rsnd_scu_transfer_start()
[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
28 #define DWL_8 (0 << 19) /* Data Word Length */
29 #define DWL_16 (1 << 19) /* Data Word Length */
30 #define DWL_18 (2 << 19) /* Data Word Length */
31 #define DWL_20 (3 << 19) /* Data Word Length */
32 #define DWL_22 (4 << 19) /* Data Word Length */
33 #define DWL_24 (5 << 19) /* Data Word Length */
34 #define DWL_32 (6 << 19) /* Data Word Length */
35
36 #define SWL_32 (3 << 16) /* R/W System Word Length */
37 #define SCKD (1 << 15) /* Serial Bit Clock Direction */
38 #define SWSD (1 << 14) /* Serial WS Direction */
39 #define SCKP (1 << 13) /* Serial Bit Clock Polarity */
40 #define SWSP (1 << 12) /* Serial WS Polarity */
41 #define SDTA (1 << 10) /* Serial Data Alignment */
42 #define DEL (1 << 8) /* Serial Data Delay */
43 #define CKDV(v) (v << 4) /* Serial Clock Division Ratio */
44 #define TRMD (1 << 1) /* Transmit/Receive Mode Select */
45 #define EN (1 << 0) /* SSI Module Enable */
46
47 /*
48 * SSISR
49 */
50 #define UIRQ (1 << 27) /* Underflow Error Interrupt Status */
51 #define OIRQ (1 << 26) /* Overflow Error Interrupt Status */
52 #define IIRQ (1 << 25) /* Idle Mode Interrupt Status */
53 #define DIRQ (1 << 24) /* Data Interrupt Status Flag */
54
55 /*
56 * SSIWSR
57 */
58 #define CONT (1 << 8) /* WS Continue Function */
59
60 struct rsnd_ssi {
61 struct clk *clk;
62 struct rsnd_ssi_platform_info *info; /* rcar_snd.h */
63 struct rsnd_ssi *parent;
64 struct rsnd_mod mod;
65
66 struct rsnd_dai *rdai;
67 struct rsnd_dai_stream *io;
68 u32 cr_own;
69 u32 cr_clk;
70 u32 cr_etc;
71 int err;
72 int dma_offset;
73 unsigned int usrcnt;
74 unsigned int rate;
75 };
76
77 struct rsnd_ssiu {
78 u32 ssi_mode0;
79 u32 ssi_mode1;
80
81 int ssi_nr;
82 struct rsnd_ssi *ssi;
83 };
84
85 #define for_each_rsnd_ssi(pos, priv, i) \
86 for (i = 0; \
87 (i < rsnd_ssi_nr(priv)) && \
88 ((pos) = ((struct rsnd_ssiu *)((priv)->ssiu))->ssi + i); \
89 i++)
90
91 #define rsnd_ssi_nr(priv) (((struct rsnd_ssiu *)((priv)->ssiu))->ssi_nr)
92 #define rsnd_mod_to_ssi(_mod) container_of((_mod), struct rsnd_ssi, mod)
93 #define rsnd_dma_to_ssi(dma) rsnd_mod_to_ssi(rsnd_dma_to_mod(dma))
94 #define rsnd_ssi_pio_available(ssi) ((ssi)->info->pio_irq > 0)
95 #define rsnd_ssi_dma_available(ssi) \
96 rsnd_dma_available(rsnd_mod_to_dma(&(ssi)->mod))
97 #define rsnd_ssi_clk_from_parent(ssi) ((ssi)->parent)
98 #define rsnd_rdai_is_clk_master(rdai) ((rdai)->clk_master)
99 #define rsnd_ssi_mode_flags(p) ((p)->info->flags)
100 #define rsnd_ssi_dai_id(ssi) ((ssi)->info->dai_id)
101 #define rsnd_ssi_to_ssiu(ssi)\
102 (((struct rsnd_ssiu *)((ssi) - rsnd_mod_id(&(ssi)->mod))) - 1)
103
104 static void rsnd_ssi_mode_set(struct rsnd_priv *priv,
105 struct rsnd_dai *rdai,
106 struct rsnd_ssi *ssi)
107 {
108 struct device *dev = rsnd_priv_to_dev(priv);
109 struct rsnd_mod *scu;
110 struct rsnd_ssiu *ssiu = rsnd_ssi_to_ssiu(ssi);
111 int id = rsnd_mod_id(&ssi->mod);
112 u32 flags;
113 u32 val;
114
115 scu = rsnd_scu_mod_get(priv, rsnd_mod_id(&ssi->mod));
116
117 /*
118 * SSI_MODE0
119 */
120
121 /* see also BUSIF_MODE */
122 if (rsnd_scu_hpbif_is_enable(scu)) {
123 ssiu->ssi_mode0 &= ~(1 << id);
124 dev_dbg(dev, "SSI%d uses DEPENDENT mode\n", id);
125 } else {
126 ssiu->ssi_mode0 |= (1 << id);
127 dev_dbg(dev, "SSI%d uses INDEPENDENT mode\n", id);
128 }
129
130 /*
131 * SSI_MODE1
132 */
133 #define ssi_parent_set(p, sync, adg, ext) \
134 do { \
135 ssi->parent = ssiu->ssi + p; \
136 if (rsnd_rdai_is_clk_master(rdai)) \
137 val = adg; \
138 else \
139 val = ext; \
140 if (flags & RSND_SSI_SYNC) \
141 val |= sync; \
142 } while (0)
143
144 flags = rsnd_ssi_mode_flags(ssi);
145 if (flags & RSND_SSI_CLK_PIN_SHARE) {
146
147 val = 0;
148 switch (id) {
149 case 1:
150 ssi_parent_set(0, (1 << 4), (0x2 << 0), (0x1 << 0));
151 break;
152 case 2:
153 ssi_parent_set(0, (1 << 4), (0x2 << 2), (0x1 << 2));
154 break;
155 case 4:
156 ssi_parent_set(3, (1 << 20), (0x2 << 16), (0x1 << 16));
157 break;
158 case 8:
159 ssi_parent_set(7, 0, 0, 0);
160 break;
161 }
162
163 ssiu->ssi_mode1 |= val;
164 }
165
166 rsnd_mod_write(&ssi->mod, SSI_MODE0, ssiu->ssi_mode0);
167 rsnd_mod_write(&ssi->mod, SSI_MODE1, ssiu->ssi_mode1);
168 }
169
170 static void rsnd_ssi_status_check(struct rsnd_mod *mod,
171 u32 bit)
172 {
173 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
174 struct device *dev = rsnd_priv_to_dev(priv);
175 u32 status;
176 int i;
177
178 for (i = 0; i < 1024; i++) {
179 status = rsnd_mod_read(mod, SSISR);
180 if (status & bit)
181 return;
182
183 udelay(50);
184 }
185
186 dev_warn(dev, "status check failed\n");
187 }
188
189 static int rsnd_ssi_master_clk_start(struct rsnd_ssi *ssi,
190 unsigned int rate)
191 {
192 struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod);
193 struct device *dev = rsnd_priv_to_dev(priv);
194 int i, j, ret;
195 int adg_clk_div_table[] = {
196 1, 6, /* see adg.c */
197 };
198 int ssi_clk_mul_table[] = {
199 1, 2, 4, 8, 16, 6, 12,
200 };
201 unsigned int main_rate;
202
203 /*
204 * Find best clock, and try to start ADG
205 */
206 for (i = 0; i < ARRAY_SIZE(adg_clk_div_table); i++) {
207 for (j = 0; j < ARRAY_SIZE(ssi_clk_mul_table); j++) {
208
209 /*
210 * this driver is assuming that
211 * system word is 64fs (= 2 x 32bit)
212 * see rsnd_ssi_init()
213 */
214 main_rate = rate / adg_clk_div_table[i]
215 * 32 * 2 * ssi_clk_mul_table[j];
216
217 ret = rsnd_adg_ssi_clk_try_start(&ssi->mod, main_rate);
218 if (0 == ret) {
219 ssi->rate = rate;
220 ssi->cr_clk = FORCE | SWL_32 |
221 SCKD | SWSD | CKDV(j);
222
223 dev_dbg(dev, "ssi%d outputs %u Hz\n",
224 rsnd_mod_id(&ssi->mod), rate);
225
226 return 0;
227 }
228 }
229 }
230
231 dev_err(dev, "unsupported clock rate\n");
232 return -EIO;
233 }
234
235 static void rsnd_ssi_master_clk_stop(struct rsnd_ssi *ssi)
236 {
237 ssi->rate = 0;
238 ssi->cr_clk = 0;
239 rsnd_adg_ssi_clk_stop(&ssi->mod);
240 }
241
242 static void rsnd_ssi_hw_start(struct rsnd_ssi *ssi,
243 struct rsnd_dai *rdai,
244 struct rsnd_dai_stream *io)
245 {
246 struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod);
247 struct device *dev = rsnd_priv_to_dev(priv);
248 u32 cr;
249
250 if (0 == ssi->usrcnt) {
251 clk_enable(ssi->clk);
252
253 if (rsnd_rdai_is_clk_master(rdai)) {
254 struct snd_pcm_runtime *runtime;
255
256 runtime = rsnd_io_to_runtime(io);
257
258 if (rsnd_ssi_clk_from_parent(ssi))
259 rsnd_ssi_hw_start(ssi->parent, rdai, io);
260 else
261 rsnd_ssi_master_clk_start(ssi, runtime->rate);
262 }
263 }
264
265 cr = ssi->cr_own |
266 ssi->cr_clk |
267 ssi->cr_etc |
268 EN;
269
270 rsnd_mod_write(&ssi->mod, SSICR, cr);
271
272 ssi->usrcnt++;
273
274 dev_dbg(dev, "ssi%d hw started\n", rsnd_mod_id(&ssi->mod));
275 }
276
277 static void rsnd_ssi_hw_stop(struct rsnd_ssi *ssi,
278 struct rsnd_dai *rdai)
279 {
280 struct rsnd_priv *priv = rsnd_mod_to_priv(&ssi->mod);
281 struct device *dev = rsnd_priv_to_dev(priv);
282 u32 cr;
283
284 if (0 == ssi->usrcnt) /* stop might be called without start */
285 return;
286
287 ssi->usrcnt--;
288
289 if (0 == ssi->usrcnt) {
290 /*
291 * disable all IRQ,
292 * and, wait all data was sent
293 */
294 cr = ssi->cr_own |
295 ssi->cr_clk;
296
297 rsnd_mod_write(&ssi->mod, SSICR, cr | EN);
298 rsnd_ssi_status_check(&ssi->mod, DIRQ);
299
300 /*
301 * disable SSI,
302 * and, wait idle state
303 */
304 rsnd_mod_write(&ssi->mod, SSICR, cr); /* disabled all */
305 rsnd_ssi_status_check(&ssi->mod, IIRQ);
306
307 if (rsnd_rdai_is_clk_master(rdai)) {
308 if (rsnd_ssi_clk_from_parent(ssi))
309 rsnd_ssi_hw_stop(ssi->parent, rdai);
310 else
311 rsnd_ssi_master_clk_stop(ssi);
312 }
313
314 clk_disable(ssi->clk);
315 }
316
317 dev_dbg(dev, "ssi%d hw stopped\n", rsnd_mod_id(&ssi->mod));
318 }
319
320 /*
321 * SSI mod common functions
322 */
323 static int rsnd_ssi_init(struct rsnd_mod *mod,
324 struct rsnd_dai *rdai,
325 struct rsnd_dai_stream *io)
326 {
327 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
328 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
329 struct device *dev = rsnd_priv_to_dev(priv);
330 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
331 u32 cr;
332
333 cr = FORCE;
334
335 /*
336 * always use 32bit system word for easy clock calculation.
337 * see also rsnd_ssi_master_clk_enable()
338 */
339 cr |= SWL_32;
340
341 /*
342 * init clock settings for SSICR
343 */
344 switch (runtime->sample_bits) {
345 case 16:
346 cr |= DWL_16;
347 break;
348 case 32:
349 cr |= DWL_24;
350 break;
351 default:
352 return -EIO;
353 }
354
355 if (rdai->bit_clk_inv)
356 cr |= SCKP;
357 if (rdai->frm_clk_inv)
358 cr |= SWSP;
359 if (rdai->data_alignment)
360 cr |= SDTA;
361 if (rdai->sys_delay)
362 cr |= DEL;
363 if (rsnd_dai_is_play(rdai, io))
364 cr |= TRMD;
365
366 /*
367 * set ssi parameter
368 */
369 ssi->rdai = rdai;
370 ssi->io = io;
371 ssi->cr_own = cr;
372 ssi->err = -1; /* ignore 1st error */
373
374 rsnd_ssi_mode_set(priv, rdai, ssi);
375
376 dev_dbg(dev, "%s.%d init\n", rsnd_mod_name(mod), rsnd_mod_id(mod));
377
378 return 0;
379 }
380
381 static int rsnd_ssi_quit(struct rsnd_mod *mod,
382 struct rsnd_dai *rdai,
383 struct rsnd_dai_stream *io)
384 {
385 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
386 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
387 struct device *dev = rsnd_priv_to_dev(priv);
388
389 dev_dbg(dev, "%s.%d quit\n", rsnd_mod_name(mod), rsnd_mod_id(mod));
390
391 if (ssi->err > 0)
392 dev_warn(dev, "ssi under/over flow err = %d\n", ssi->err);
393
394 ssi->rdai = NULL;
395 ssi->io = NULL;
396 ssi->cr_own = 0;
397 ssi->err = 0;
398
399 return 0;
400 }
401
402 static void rsnd_ssi_record_error(struct rsnd_ssi *ssi, u32 status)
403 {
404 /* under/over flow error */
405 if (status & (UIRQ | OIRQ)) {
406 ssi->err++;
407
408 /* clear error status */
409 rsnd_mod_write(&ssi->mod, SSISR, 0);
410 }
411 }
412
413 /*
414 * SSI PIO
415 */
416 static irqreturn_t rsnd_ssi_pio_interrupt(int irq, void *data)
417 {
418 struct rsnd_ssi *ssi = data;
419 struct rsnd_dai_stream *io = ssi->io;
420 u32 status = rsnd_mod_read(&ssi->mod, SSISR);
421 irqreturn_t ret = IRQ_NONE;
422
423 if (io && (status & DIRQ)) {
424 struct rsnd_dai *rdai = ssi->rdai;
425 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
426 u32 *buf = (u32 *)(runtime->dma_area +
427 rsnd_dai_pointer_offset(io, 0));
428
429 rsnd_ssi_record_error(ssi, status);
430
431 /*
432 * 8/16/32 data can be assesse to TDR/RDR register
433 * directly as 32bit data
434 * see rsnd_ssi_init()
435 */
436 if (rsnd_dai_is_play(rdai, io))
437 rsnd_mod_write(&ssi->mod, SSITDR, *buf);
438 else
439 *buf = rsnd_mod_read(&ssi->mod, SSIRDR);
440
441 rsnd_dai_pointer_update(io, sizeof(*buf));
442
443 ret = IRQ_HANDLED;
444 }
445
446 return ret;
447 }
448
449 static int rsnd_ssi_pio_start(struct rsnd_mod *mod,
450 struct rsnd_dai *rdai,
451 struct rsnd_dai_stream *io)
452 {
453 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
454 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
455 struct device *dev = rsnd_priv_to_dev(priv);
456
457 /* enable PIO IRQ */
458 ssi->cr_etc = UIEN | OIEN | DIEN;
459
460 /* enable PIO interrupt */
461 rsnd_mod_write(&ssi->mod, INT_ENABLE, 0x0f000000);
462
463 rsnd_ssi_hw_start(ssi, rdai, io);
464
465 dev_dbg(dev, "%s.%d start\n", rsnd_mod_name(mod), rsnd_mod_id(mod));
466
467 return 0;
468 }
469
470 static int rsnd_ssi_pio_stop(struct rsnd_mod *mod,
471 struct rsnd_dai *rdai,
472 struct rsnd_dai_stream *io)
473 {
474 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
475 struct device *dev = rsnd_priv_to_dev(priv);
476 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
477
478 dev_dbg(dev, "%s.%d stop\n", rsnd_mod_name(mod), rsnd_mod_id(mod));
479
480 ssi->cr_etc = 0;
481
482 rsnd_ssi_hw_stop(ssi, rdai);
483
484 return 0;
485 }
486
487 static struct rsnd_mod_ops rsnd_ssi_pio_ops = {
488 .name = "ssi (pio)",
489 .init = rsnd_ssi_init,
490 .quit = rsnd_ssi_quit,
491 .start = rsnd_ssi_pio_start,
492 .stop = rsnd_ssi_pio_stop,
493 };
494
495 static int rsnd_ssi_dma_inquiry(struct rsnd_dma *dma, dma_addr_t *buf, int *len)
496 {
497 struct rsnd_ssi *ssi = rsnd_dma_to_ssi(dma);
498 struct rsnd_dai_stream *io = ssi->io;
499 struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
500
501 *len = io->byte_per_period;
502 *buf = runtime->dma_addr +
503 rsnd_dai_pointer_offset(io, ssi->dma_offset + *len);
504 ssi->dma_offset = *len; /* it cares A/B plane */
505
506 return 0;
507 }
508
509 static int rsnd_ssi_dma_complete(struct rsnd_dma *dma)
510 {
511 struct rsnd_ssi *ssi = rsnd_dma_to_ssi(dma);
512 struct rsnd_dai_stream *io = ssi->io;
513 u32 status = rsnd_mod_read(&ssi->mod, SSISR);
514
515 rsnd_ssi_record_error(ssi, status);
516
517 rsnd_dai_pointer_update(ssi->io, io->byte_per_period);
518
519 return 0;
520 }
521
522 static int rsnd_ssi_dma_start(struct rsnd_mod *mod,
523 struct rsnd_dai *rdai,
524 struct rsnd_dai_stream *io)
525 {
526 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
527 struct rsnd_dma *dma = rsnd_mod_to_dma(&ssi->mod);
528
529 /* enable DMA transfer */
530 ssi->cr_etc = DMEN;
531 ssi->dma_offset = 0;
532
533 rsnd_dma_start(dma);
534
535 rsnd_ssi_hw_start(ssi, ssi->rdai, io);
536
537 /* enable WS continue */
538 if (rsnd_rdai_is_clk_master(rdai))
539 rsnd_mod_write(&ssi->mod, SSIWSR, CONT);
540
541 return 0;
542 }
543
544 static int rsnd_ssi_dma_stop(struct rsnd_mod *mod,
545 struct rsnd_dai *rdai,
546 struct rsnd_dai_stream *io)
547 {
548 struct rsnd_ssi *ssi = rsnd_mod_to_ssi(mod);
549 struct rsnd_dma *dma = rsnd_mod_to_dma(&ssi->mod);
550
551 ssi->cr_etc = 0;
552
553 rsnd_ssi_hw_stop(ssi, rdai);
554
555 rsnd_dma_stop(dma);
556
557 return 0;
558 }
559
560 static struct rsnd_mod_ops rsnd_ssi_dma_ops = {
561 .name = "ssi (dma)",
562 .init = rsnd_ssi_init,
563 .quit = rsnd_ssi_quit,
564 .start = rsnd_ssi_dma_start,
565 .stop = rsnd_ssi_dma_stop,
566 };
567
568 /*
569 * Non SSI
570 */
571 static int rsnd_ssi_non(struct rsnd_mod *mod,
572 struct rsnd_dai *rdai,
573 struct rsnd_dai_stream *io)
574 {
575 struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
576 struct device *dev = rsnd_priv_to_dev(priv);
577
578 dev_dbg(dev, "%s\n", __func__);
579
580 return 0;
581 }
582
583 static struct rsnd_mod_ops rsnd_ssi_non_ops = {
584 .name = "ssi (non)",
585 .init = rsnd_ssi_non,
586 .quit = rsnd_ssi_non,
587 .start = rsnd_ssi_non,
588 .stop = rsnd_ssi_non,
589 };
590
591 /*
592 * ssi mod function
593 */
594 struct rsnd_mod *rsnd_ssi_mod_get_frm_dai(struct rsnd_priv *priv,
595 int dai_id, int is_play)
596 {
597 struct rsnd_ssi *ssi;
598 int i, has_play;
599
600 is_play = !!is_play;
601
602 for_each_rsnd_ssi(ssi, priv, i) {
603 if (rsnd_ssi_dai_id(ssi) != dai_id)
604 continue;
605
606 has_play = !!(rsnd_ssi_mode_flags(ssi) & RSND_SSI_PLAY);
607
608 if (is_play == has_play)
609 return &ssi->mod;
610 }
611
612 return NULL;
613 }
614
615 struct rsnd_mod *rsnd_ssi_mod_get(struct rsnd_priv *priv, int id)
616 {
617 BUG_ON(id < 0 || id >= rsnd_ssi_nr(priv));
618
619 return &(((struct rsnd_ssiu *)(priv->ssiu))->ssi + id)->mod;
620 }
621
622 int rsnd_ssi_probe(struct platform_device *pdev,
623 struct rcar_snd_info *info,
624 struct rsnd_priv *priv)
625 {
626 struct rsnd_ssi_platform_info *pinfo;
627 struct device *dev = rsnd_priv_to_dev(priv);
628 struct rsnd_mod_ops *ops;
629 struct clk *clk;
630 struct rsnd_ssiu *ssiu;
631 struct rsnd_ssi *ssi;
632 char name[RSND_SSI_NAME_SIZE];
633 int i, nr, ret;
634
635 /*
636 * init SSI
637 */
638 nr = info->ssi_info_nr;
639 ssiu = devm_kzalloc(dev, sizeof(*ssiu) + (sizeof(*ssi) * nr),
640 GFP_KERNEL);
641 if (!ssiu) {
642 dev_err(dev, "SSI allocate failed\n");
643 return -ENOMEM;
644 }
645
646 priv->ssiu = ssiu;
647 ssiu->ssi = (struct rsnd_ssi *)(ssiu + 1);
648 ssiu->ssi_nr = nr;
649
650 for_each_rsnd_ssi(ssi, priv, i) {
651 pinfo = &info->ssi_info[i];
652
653 snprintf(name, RSND_SSI_NAME_SIZE, "ssi.%d", i);
654
655 clk = devm_clk_get(dev, name);
656 if (IS_ERR(clk))
657 return PTR_ERR(clk);
658
659 ssi->info = pinfo;
660 ssi->clk = clk;
661
662 ops = &rsnd_ssi_non_ops;
663
664 /*
665 * SSI DMA case
666 */
667 if (pinfo->dma_id > 0) {
668 ret = rsnd_dma_init(
669 priv, rsnd_mod_to_dma(&ssi->mod),
670 (rsnd_ssi_mode_flags(ssi) & RSND_SSI_PLAY),
671 pinfo->dma_id,
672 rsnd_ssi_dma_inquiry,
673 rsnd_ssi_dma_complete);
674 if (ret < 0)
675 dev_info(dev, "SSI DMA failed. try PIO transter\n");
676 else
677 ops = &rsnd_ssi_dma_ops;
678
679 dev_dbg(dev, "SSI%d use DMA transfer\n", i);
680 }
681
682 /*
683 * SSI PIO case
684 */
685 if (!rsnd_ssi_dma_available(ssi) &&
686 rsnd_ssi_pio_available(ssi)) {
687 ret = devm_request_irq(dev, pinfo->pio_irq,
688 &rsnd_ssi_pio_interrupt,
689 IRQF_SHARED,
690 dev_name(dev), ssi);
691 if (ret) {
692 dev_err(dev, "SSI request interrupt failed\n");
693 return ret;
694 }
695
696 ops = &rsnd_ssi_pio_ops;
697
698 dev_dbg(dev, "SSI%d use PIO transfer\n", i);
699 }
700
701 rsnd_mod_init(priv, &ssi->mod, ops, i);
702 }
703
704 dev_dbg(dev, "ssi probed\n");
705
706 return 0;
707 }
708
709 void rsnd_ssi_remove(struct platform_device *pdev,
710 struct rsnd_priv *priv)
711 {
712 struct rsnd_ssi *ssi;
713 int i;
714
715 for_each_rsnd_ssi(ssi, priv, i) {
716 if (rsnd_ssi_dma_available(ssi))
717 rsnd_dma_quit(priv, rsnd_mod_to_dma(&ssi->mod));
718 }
719
720 }
Linux kernel - Deliverables
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