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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / sound / soc / dwc / dwc-i2s.c
blob7eeca2150b2d6280f818e9e845ab4269ab4acb64
1 /*
2 * ALSA SoC Synopsys I2S Audio Layer
3 *
4 * sound/soc/dwc/designware_i2s.c
5 *
6 * Copyright (C) 2010 ST Microelectronics
7 * Rajeev Kumar <rajeevkumar.linux@gmail.com>
8 *
9 * This file is licensed under the terms of the GNU General Public
10 * License version 2. This program is licensed "as is" without any
11 * warranty of any kind, whether express or implied.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/device.h>
16 #include <linux/init.h>
17 #include <linux/io.h>
18 #include <linux/interrupt.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
21 #include <linux/pm_runtime.h>
22 #include <sound/designware_i2s.h>
23 #include <sound/pcm.h>
24 #include <sound/pcm_params.h>
25 #include <sound/soc.h>
26 #include <sound/dmaengine_pcm.h>
27 #include "local.h"
28
29 static inline void i2s_write_reg(void __iomem *io_base, int reg, u32 val)
30 {
31 writel(val, io_base + reg);
32 }
33
34 static inline u32 i2s_read_reg(void __iomem *io_base, int reg)
35 {
36 return readl(io_base + reg);
37 }
38
39 static inline void i2s_disable_channels(struct dw_i2s_dev *dev, u32 stream)
40 {
41 u32 i = 0;
42
43 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
44 for (i = 0; i < 4; i++)
45 i2s_write_reg(dev->i2s_base, TER(i), 0);
46 } else {
47 for (i = 0; i < 4; i++)
48 i2s_write_reg(dev->i2s_base, RER(i), 0);
49 }
50 }
51
52 static inline void i2s_clear_irqs(struct dw_i2s_dev *dev, u32 stream)
53 {
54 u32 i = 0;
55
56 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
57 for (i = 0; i < 4; i++)
58 i2s_read_reg(dev->i2s_base, TOR(i));
59 } else {
60 for (i = 0; i < 4; i++)
61 i2s_read_reg(dev->i2s_base, ROR(i));
62 }
63 }
64
65 static inline void i2s_disable_irqs(struct dw_i2s_dev *dev, u32 stream,
66 int chan_nr)
67 {
68 u32 i, irq;
69
70 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
71 for (i = 0; i < (chan_nr / 2); i++) {
72 irq = i2s_read_reg(dev->i2s_base, IMR(i));
73 i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x30);
74 }
75 } else {
76 for (i = 0; i < (chan_nr / 2); i++) {
77 irq = i2s_read_reg(dev->i2s_base, IMR(i));
78 i2s_write_reg(dev->i2s_base, IMR(i), irq | 0x03);
79 }
80 }
81 }
82
83 static inline void i2s_enable_irqs(struct dw_i2s_dev *dev, u32 stream,
84 int chan_nr)
85 {
86 u32 i, irq;
87
88 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
89 for (i = 0; i < (chan_nr / 2); i++) {
90 irq = i2s_read_reg(dev->i2s_base, IMR(i));
91 i2s_write_reg(dev->i2s_base, IMR(i), irq & ~0x30);
92 }
93 } else {
94 for (i = 0; i < (chan_nr / 2); i++) {
95 irq = i2s_read_reg(dev->i2s_base, IMR(i));
96 i2s_write_reg(dev->i2s_base, IMR(i), irq & ~0x03);
97 }
98 }
99 }
100
101 static irqreturn_t i2s_irq_handler(int irq, void *dev_id)
102 {
103 struct dw_i2s_dev *dev = dev_id;
104 bool irq_valid = false;
105 u32 isr[4];
106 int i;
107
108 for (i = 0; i < 4; i++)
109 isr[i] = i2s_read_reg(dev->i2s_base, ISR(i));
110
111 i2s_clear_irqs(dev, SNDRV_PCM_STREAM_PLAYBACK);
112 i2s_clear_irqs(dev, SNDRV_PCM_STREAM_CAPTURE);
113
114 for (i = 0; i < 4; i++) {
115 /*
116 * Check if TX fifo is empty. If empty fill FIFO with samples
117 * NOTE: Only two channels supported
118 */
119 if ((isr[i] & ISR_TXFE) && (i == 0) && dev->use_pio) {
120 dw_pcm_push_tx(dev);
121 irq_valid = true;
122 }
123
124 /*
125 * Data available. Retrieve samples from FIFO
126 * NOTE: Only two channels supported
127 */
128 if ((isr[i] & ISR_RXDA) && (i == 0) && dev->use_pio) {
129 dw_pcm_pop_rx(dev);
130 irq_valid = true;
131 }
132
133 /* Error Handling: TX */
134 if (isr[i] & ISR_TXFO) {
135 dev_err(dev->dev, "TX overrun (ch_id=%d)\n", i);
136 irq_valid = true;
137 }
138
139 /* Error Handling: TX */
140 if (isr[i] & ISR_RXFO) {
141 dev_err(dev->dev, "RX overrun (ch_id=%d)\n", i);
142 irq_valid = true;
143 }
144 }
145
146 if (irq_valid)
147 return IRQ_HANDLED;
148 else
149 return IRQ_NONE;
150 }
151
152 static void i2s_start(struct dw_i2s_dev *dev,
153 struct snd_pcm_substream *substream)
154 {
155 struct i2s_clk_config_data *config = &dev->config;
156
157 i2s_write_reg(dev->i2s_base, IER, 1);
158 i2s_enable_irqs(dev, substream->stream, config->chan_nr);
159
160 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
161 i2s_write_reg(dev->i2s_base, ITER, 1);
162 else
163 i2s_write_reg(dev->i2s_base, IRER, 1);
164
165 i2s_write_reg(dev->i2s_base, CER, 1);
166 }
167
168 static void i2s_stop(struct dw_i2s_dev *dev,
169 struct snd_pcm_substream *substream)
170 {
171
172 i2s_clear_irqs(dev, substream->stream);
173 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
174 i2s_write_reg(dev->i2s_base, ITER, 0);
175 else
176 i2s_write_reg(dev->i2s_base, IRER, 0);
177
178 i2s_disable_irqs(dev, substream->stream, 8);
179
180 if (!dev->active) {
181 i2s_write_reg(dev->i2s_base, CER, 0);
182 i2s_write_reg(dev->i2s_base, IER, 0);
183 }
184 }
185
186 static int dw_i2s_startup(struct snd_pcm_substream *substream,
187 struct snd_soc_dai *cpu_dai)
188 {
189 struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
190 union dw_i2s_snd_dma_data *dma_data = NULL;
191
192 if (!(dev->capability & DWC_I2S_RECORD) &&
193 (substream->stream == SNDRV_PCM_STREAM_CAPTURE))
194 return -EINVAL;
195
196 if (!(dev->capability & DWC_I2S_PLAY) &&
197 (substream->stream == SNDRV_PCM_STREAM_PLAYBACK))
198 return -EINVAL;
199
200 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
201 dma_data = &dev->play_dma_data;
202 else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
203 dma_data = &dev->capture_dma_data;
204
205 snd_soc_dai_set_dma_data(cpu_dai, substream, (void *)dma_data);
206
207 return 0;
208 }
209
210 static void dw_i2s_config(struct dw_i2s_dev *dev, int stream)
211 {
212 u32 ch_reg;
213 struct i2s_clk_config_data *config = &dev->config;
214
215
216 i2s_disable_channels(dev, stream);
217
218 for (ch_reg = 0; ch_reg < (config->chan_nr / 2); ch_reg++) {
219 if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
220 i2s_write_reg(dev->i2s_base, TCR(ch_reg),
221 dev->xfer_resolution);
222 i2s_write_reg(dev->i2s_base, TFCR(ch_reg),
223 dev->fifo_th - 1);
224 i2s_write_reg(dev->i2s_base, TER(ch_reg), 1);
225 } else {
226 i2s_write_reg(dev->i2s_base, RCR(ch_reg),
227 dev->xfer_resolution);
228 i2s_write_reg(dev->i2s_base, RFCR(ch_reg),
229 dev->fifo_th - 1);
230 i2s_write_reg(dev->i2s_base, RER(ch_reg), 1);
231 }
232
233 }
234 }
235
236 static int dw_i2s_hw_params(struct snd_pcm_substream *substream,
237 struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
238 {
239 struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
240 struct i2s_clk_config_data *config = &dev->config;
241 int ret;
242
243 switch (params_format(params)) {
244 case SNDRV_PCM_FORMAT_S16_LE:
245 config->data_width = 16;
246 dev->ccr = 0x00;
247 dev->xfer_resolution = 0x02;
248 break;
249
250 case SNDRV_PCM_FORMAT_S24_LE:
251 config->data_width = 24;
252 dev->ccr = 0x08;
253 dev->xfer_resolution = 0x04;
254 break;
255
256 case SNDRV_PCM_FORMAT_S32_LE:
257 config->data_width = 32;
258 dev->ccr = 0x10;
259 dev->xfer_resolution = 0x05;
260 break;
261
262 default:
263 dev_err(dev->dev, "designware-i2s: unsupported PCM fmt");
264 return -EINVAL;
265 }
266
267 config->chan_nr = params_channels(params);
268
269 switch (config->chan_nr) {
270 case EIGHT_CHANNEL_SUPPORT:
271 case SIX_CHANNEL_SUPPORT:
272 case FOUR_CHANNEL_SUPPORT:
273 case TWO_CHANNEL_SUPPORT:
274 break;
275 default:
276 dev_err(dev->dev, "channel not supported\n");
277 return -EINVAL;
278 }
279
280 dw_i2s_config(dev, substream->stream);
281
282 i2s_write_reg(dev->i2s_base, CCR, dev->ccr);
283
284 config->sample_rate = params_rate(params);
285
286 if (dev->capability & DW_I2S_MASTER) {
287 if (dev->i2s_clk_cfg) {
288 ret = dev->i2s_clk_cfg(config);
289 if (ret < 0) {
290 dev_err(dev->dev, "runtime audio clk config fail\n");
291 return ret;
292 }
293 } else {
294 u32 bitclk = config->sample_rate *
295 config->data_width * 2;
296
297 ret = clk_set_rate(dev->clk, bitclk);
298 if (ret) {
299 dev_err(dev->dev, "Can't set I2S clock rate: %d\n",
300 ret);
301 return ret;
302 }
303 }
304 }
305 return 0;
306 }
307
308 static void dw_i2s_shutdown(struct snd_pcm_substream *substream,
309 struct snd_soc_dai *dai)
310 {
311 snd_soc_dai_set_dma_data(dai, substream, NULL);
312 }
313
314 static int dw_i2s_prepare(struct snd_pcm_substream *substream,
315 struct snd_soc_dai *dai)
316 {
317 struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
318
319 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
320 i2s_write_reg(dev->i2s_base, TXFFR, 1);
321 else
322 i2s_write_reg(dev->i2s_base, RXFFR, 1);
323
324 return 0;
325 }
326
327 static int dw_i2s_trigger(struct snd_pcm_substream *substream,
328 int cmd, struct snd_soc_dai *dai)
329 {
330 struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
331 int ret = 0;
332
333 switch (cmd) {
334 case SNDRV_PCM_TRIGGER_START:
335 case SNDRV_PCM_TRIGGER_RESUME:
336 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
337 dev->active++;
338 i2s_start(dev, substream);
339 break;
340
341 case SNDRV_PCM_TRIGGER_STOP:
342 case SNDRV_PCM_TRIGGER_SUSPEND:
343 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
344 dev->active--;
345 i2s_stop(dev, substream);
346 break;
347 default:
348 ret = -EINVAL;
349 break;
350 }
351 return ret;
352 }
353
354 static int dw_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
355 {
356 struct dw_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
357 int ret = 0;
358
359 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
360 case SND_SOC_DAIFMT_CBM_CFM:
361 if (dev->capability & DW_I2S_SLAVE)
362 ret = 0;
363 else
364 ret = -EINVAL;
365 break;
366 case SND_SOC_DAIFMT_CBS_CFS:
367 if (dev->capability & DW_I2S_MASTER)
368 ret = 0;
369 else
370 ret = -EINVAL;
371 break;
372 case SND_SOC_DAIFMT_CBM_CFS:
373 case SND_SOC_DAIFMT_CBS_CFM:
374 ret = -EINVAL;
375 break;
376 default:
377 dev_dbg(dev->dev, "dwc : Invalid master/slave format\n");
378 ret = -EINVAL;
379 break;
380 }
381 return ret;
382 }
383
384 static const struct snd_soc_dai_ops dw_i2s_dai_ops = {
385 .startup = dw_i2s_startup,
386 .shutdown = dw_i2s_shutdown,
387 .hw_params = dw_i2s_hw_params,
388 .prepare = dw_i2s_prepare,
389 .trigger = dw_i2s_trigger,
390 .set_fmt = dw_i2s_set_fmt,
391 };
392
393 #ifdef CONFIG_PM
394 static int dw_i2s_runtime_suspend(struct device *dev)
395 {
396 struct dw_i2s_dev *dw_dev = dev_get_drvdata(dev);
397
398 if (dw_dev->capability & DW_I2S_MASTER)
399 clk_disable(dw_dev->clk);
400 return 0;
401 }
402
403 static int dw_i2s_runtime_resume(struct device *dev)
404 {
405 struct dw_i2s_dev *dw_dev = dev_get_drvdata(dev);
406
407 if (dw_dev->capability & DW_I2S_MASTER)
408 clk_enable(dw_dev->clk);
409 return 0;
410 }
411
412 static int dw_i2s_suspend(struct snd_soc_component *component)
413 {
414 struct dw_i2s_dev *dev = snd_soc_component_get_drvdata(component);
415
416 if (dev->capability & DW_I2S_MASTER)
417 clk_disable(dev->clk);
418 return 0;
419 }
420
421 static int dw_i2s_resume(struct snd_soc_component *component)
422 {
423 struct dw_i2s_dev *dev = snd_soc_component_get_drvdata(component);
424 struct snd_soc_dai *dai;
425
426 if (dev->capability & DW_I2S_MASTER)
427 clk_enable(dev->clk);
428
429 for_each_component_dais(component, dai) {
430 if (dai->playback_active)
431 dw_i2s_config(dev, SNDRV_PCM_STREAM_PLAYBACK);
432 if (dai->capture_active)
433 dw_i2s_config(dev, SNDRV_PCM_STREAM_CAPTURE);
434 }
435
436 return 0;
437 }
438
439 #else
440 #define dw_i2s_suspend NULL
441 #define dw_i2s_resume NULL
442 #endif
443
444 static const struct snd_soc_component_driver dw_i2s_component = {
445 .name = "dw-i2s",
446 .suspend = dw_i2s_suspend,
447 .resume = dw_i2s_resume,
448 };
449
450 /*
451 * The following tables allow a direct lookup of various parameters
452 * defined in the I2S block's configuration in terms of sound system
453 * parameters. Each table is sized to the number of entries possible
454 * according to the number of configuration bits describing an I2S
455 * block parameter.
456 */
457
458 /* Maximum bit resolution of a channel - not uniformly spaced */
459 static const u32 fifo_width[COMP_MAX_WORDSIZE] = {
460 12, 16, 20, 24, 32, 0, 0, 0
461 };
462
463 /* Width of (DMA) bus */
464 static const u32 bus_widths[COMP_MAX_DATA_WIDTH] = {
465 DMA_SLAVE_BUSWIDTH_1_BYTE,
466 DMA_SLAVE_BUSWIDTH_2_BYTES,
467 DMA_SLAVE_BUSWIDTH_4_BYTES,
468 DMA_SLAVE_BUSWIDTH_UNDEFINED
469 };
470
471 /* PCM format to support channel resolution */
472 static const u32 formats[COMP_MAX_WORDSIZE] = {
473 SNDRV_PCM_FMTBIT_S16_LE,
474 SNDRV_PCM_FMTBIT_S16_LE,
475 SNDRV_PCM_FMTBIT_S24_LE,
476 SNDRV_PCM_FMTBIT_S24_LE,
477 SNDRV_PCM_FMTBIT_S32_LE,
478 0,
479 0,
480 0
481 };
482
483 static int dw_configure_dai(struct dw_i2s_dev *dev,
484 struct snd_soc_dai_driver *dw_i2s_dai,
485 unsigned int rates)
486 {
487 /*
488 * Read component parameter registers to extract
489 * the I2S block's configuration.
490 */
491 u32 comp1 = i2s_read_reg(dev->i2s_base, dev->i2s_reg_comp1);
492 u32 comp2 = i2s_read_reg(dev->i2s_base, dev->i2s_reg_comp2);
493 u32 fifo_depth = 1 << (1 + COMP1_FIFO_DEPTH_GLOBAL(comp1));
494 u32 idx;
495
496 if (dev->capability & DWC_I2S_RECORD &&
497 dev->quirks & DW_I2S_QUIRK_COMP_PARAM1)
498 comp1 = comp1 & ~BIT(5);
499
500 if (dev->capability & DWC_I2S_PLAY &&
501 dev->quirks & DW_I2S_QUIRK_COMP_PARAM1)
502 comp1 = comp1 & ~BIT(6);
503
504 if (COMP1_TX_ENABLED(comp1)) {
505 dev_dbg(dev->dev, " designware: play supported\n");
506 idx = COMP1_TX_WORDSIZE_0(comp1);
507 if (WARN_ON(idx >= ARRAY_SIZE(formats)))
508 return -EINVAL;
509 if (dev->quirks & DW_I2S_QUIRK_16BIT_IDX_OVERRIDE)
510 idx = 1;
511 dw_i2s_dai->playback.channels_min = MIN_CHANNEL_NUM;
512 dw_i2s_dai->playback.channels_max =
513 1 << (COMP1_TX_CHANNELS(comp1) + 1);
514 dw_i2s_dai->playback.formats = formats[idx];
515 dw_i2s_dai->playback.rates = rates;
516 }
517
518 if (COMP1_RX_ENABLED(comp1)) {
519 dev_dbg(dev->dev, "designware: record supported\n");
520 idx = COMP2_RX_WORDSIZE_0(comp2);
521 if (WARN_ON(idx >= ARRAY_SIZE(formats)))
522 return -EINVAL;
523 if (dev->quirks & DW_I2S_QUIRK_16BIT_IDX_OVERRIDE)
524 idx = 1;
525 dw_i2s_dai->capture.channels_min = MIN_CHANNEL_NUM;
526 dw_i2s_dai->capture.channels_max =
527 1 << (COMP1_RX_CHANNELS(comp1) + 1);
528 dw_i2s_dai->capture.formats = formats[idx];
529 dw_i2s_dai->capture.rates = rates;
530 }
531
532 if (COMP1_MODE_EN(comp1)) {
533 dev_dbg(dev->dev, "designware: i2s master mode supported\n");
534 dev->capability |= DW_I2S_MASTER;
535 } else {
536 dev_dbg(dev->dev, "designware: i2s slave mode supported\n");
537 dev->capability |= DW_I2S_SLAVE;
538 }
539
540 dev->fifo_th = fifo_depth / 2;
541 return 0;
542 }
543
544 static int dw_configure_dai_by_pd(struct dw_i2s_dev *dev,
545 struct snd_soc_dai_driver *dw_i2s_dai,
546 struct resource *res,
547 const struct i2s_platform_data *pdata)
548 {
549 u32 comp1 = i2s_read_reg(dev->i2s_base, dev->i2s_reg_comp1);
550 u32 idx = COMP1_APB_DATA_WIDTH(comp1);
551 int ret;
552
553 if (WARN_ON(idx >= ARRAY_SIZE(bus_widths)))
554 return -EINVAL;
555
556 ret = dw_configure_dai(dev, dw_i2s_dai, pdata->snd_rates);
557 if (ret < 0)
558 return ret;
559
560 if (dev->quirks & DW_I2S_QUIRK_16BIT_IDX_OVERRIDE)
561 idx = 1;
562 /* Set DMA slaves info */
563 dev->play_dma_data.pd.data = pdata->play_dma_data;
564 dev->capture_dma_data.pd.data = pdata->capture_dma_data;
565 dev->play_dma_data.pd.addr = res->start + I2S_TXDMA;
566 dev->capture_dma_data.pd.addr = res->start + I2S_RXDMA;
567 dev->play_dma_data.pd.max_burst = 16;
568 dev->capture_dma_data.pd.max_burst = 16;
569 dev->play_dma_data.pd.addr_width = bus_widths[idx];
570 dev->capture_dma_data.pd.addr_width = bus_widths[idx];
571 dev->play_dma_data.pd.filter = pdata->filter;
572 dev->capture_dma_data.pd.filter = pdata->filter;
573
574 return 0;
575 }
576
577 static int dw_configure_dai_by_dt(struct dw_i2s_dev *dev,
578 struct snd_soc_dai_driver *dw_i2s_dai,
579 struct resource *res)
580 {
581 u32 comp1 = i2s_read_reg(dev->i2s_base, I2S_COMP_PARAM_1);
582 u32 comp2 = i2s_read_reg(dev->i2s_base, I2S_COMP_PARAM_2);
583 u32 fifo_depth = 1 << (1 + COMP1_FIFO_DEPTH_GLOBAL(comp1));
584 u32 idx = COMP1_APB_DATA_WIDTH(comp1);
585 u32 idx2;
586 int ret;
587
588 if (WARN_ON(idx >= ARRAY_SIZE(bus_widths)))
589 return -EINVAL;
590
591 ret = dw_configure_dai(dev, dw_i2s_dai, SNDRV_PCM_RATE_8000_192000);
592 if (ret < 0)
593 return ret;
594
595 if (COMP1_TX_ENABLED(comp1)) {
596 idx2 = COMP1_TX_WORDSIZE_0(comp1);
597
598 dev->capability |= DWC_I2S_PLAY;
599 dev->play_dma_data.dt.addr = res->start + I2S_TXDMA;
600 dev->play_dma_data.dt.addr_width = bus_widths[idx];
601 dev->play_dma_data.dt.fifo_size = fifo_depth *
602 (fifo_width[idx2]) >> 8;
603 dev->play_dma_data.dt.maxburst = 16;
604 }
605 if (COMP1_RX_ENABLED(comp1)) {
606 idx2 = COMP2_RX_WORDSIZE_0(comp2);
607
608 dev->capability |= DWC_I2S_RECORD;
609 dev->capture_dma_data.dt.addr = res->start + I2S_RXDMA;
610 dev->capture_dma_data.dt.addr_width = bus_widths[idx];
611 dev->capture_dma_data.dt.fifo_size = fifo_depth *
612 (fifo_width[idx2] >> 8);
613 dev->capture_dma_data.dt.maxburst = 16;
614 }
615
616 return 0;
617
618 }
619
620 static int dw_i2s_probe(struct platform_device *pdev)
621 {
622 const struct i2s_platform_data *pdata = pdev->dev.platform_data;
623 struct dw_i2s_dev *dev;
624 struct resource *res;
625 int ret, irq;
626 struct snd_soc_dai_driver *dw_i2s_dai;
627 const char *clk_id;
628
629 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
630 if (!dev)
631 return -ENOMEM;
632
633 dw_i2s_dai = devm_kzalloc(&pdev->dev, sizeof(*dw_i2s_dai), GFP_KERNEL);
634 if (!dw_i2s_dai)
635 return -ENOMEM;
636
637 dw_i2s_dai->ops = &dw_i2s_dai_ops;
638
639 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
640 dev->i2s_base = devm_ioremap_resource(&pdev->dev, res);
641 if (IS_ERR(dev->i2s_base))
642 return PTR_ERR(dev->i2s_base);
643
644 dev->dev = &pdev->dev;
645
646 irq = platform_get_irq(pdev, 0);
647 if (irq >= 0) {
648 ret = devm_request_irq(&pdev->dev, irq, i2s_irq_handler, 0,
649 pdev->name, dev);
650 if (ret < 0) {
651 dev_err(&pdev->dev, "failed to request irq\n");
652 return ret;
653 }
654 }
655
656 dev->i2s_reg_comp1 = I2S_COMP_PARAM_1;
657 dev->i2s_reg_comp2 = I2S_COMP_PARAM_2;
658 if (pdata) {
659 dev->capability = pdata->cap;
660 clk_id = NULL;
661 dev->quirks = pdata->quirks;
662 if (dev->quirks & DW_I2S_QUIRK_COMP_REG_OFFSET) {
663 dev->i2s_reg_comp1 = pdata->i2s_reg_comp1;
664 dev->i2s_reg_comp2 = pdata->i2s_reg_comp2;
665 }
666 ret = dw_configure_dai_by_pd(dev, dw_i2s_dai, res, pdata);
667 } else {
668 clk_id = "i2sclk";
669 ret = dw_configure_dai_by_dt(dev, dw_i2s_dai, res);
670 }
671 if (ret < 0)
672 return ret;
673
674 if (dev->capability & DW_I2S_MASTER) {
675 if (pdata) {
676 dev->i2s_clk_cfg = pdata->i2s_clk_cfg;
677 if (!dev->i2s_clk_cfg) {
678 dev_err(&pdev->dev, "no clock configure method\n");
679 return -ENODEV;
680 }
681 }
682 dev->clk = devm_clk_get(&pdev->dev, clk_id);
683
684 if (IS_ERR(dev->clk))
685 return PTR_ERR(dev->clk);
686
687 ret = clk_prepare_enable(dev->clk);
688 if (ret < 0)
689 return ret;
690 }
691
692 dev_set_drvdata(&pdev->dev, dev);
693 ret = devm_snd_soc_register_component(&pdev->dev, &dw_i2s_component,
694 dw_i2s_dai, 1);
695 if (ret != 0) {
696 dev_err(&pdev->dev, "not able to register dai\n");
697 goto err_clk_disable;
698 }
699
700 if (!pdata) {
701 if (irq >= 0) {
702 ret = dw_pcm_register(pdev);
703 dev->use_pio = true;
704 } else {
705 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL,
706 0);
707 dev->use_pio = false;
708 }
709
710 if (ret) {
711 dev_err(&pdev->dev, "could not register pcm: %d\n",
712 ret);
713 goto err_clk_disable;
714 }
715 }
716
717 pm_runtime_enable(&pdev->dev);
718 return 0;
719
720 err_clk_disable:
721 if (dev->capability & DW_I2S_MASTER)
722 clk_disable_unprepare(dev->clk);
723 return ret;
724 }
725
726 static int dw_i2s_remove(struct platform_device *pdev)
727 {
728 struct dw_i2s_dev *dev = dev_get_drvdata(&pdev->dev);
729
730 if (dev->capability & DW_I2S_MASTER)
731 clk_disable_unprepare(dev->clk);
732
733 pm_runtime_disable(&pdev->dev);
734 return 0;
735 }
736
737 #ifdef CONFIG_OF
738 static const struct of_device_id dw_i2s_of_match[] = {
739 { .compatible = "snps,designware-i2s", },
740 {},
741 };
742
743 MODULE_DEVICE_TABLE(of, dw_i2s_of_match);
744 #endif
745
746 static const struct dev_pm_ops dwc_pm_ops = {
747 SET_RUNTIME_PM_OPS(dw_i2s_runtime_suspend, dw_i2s_runtime_resume, NULL)
748 };
749
750 static struct platform_driver dw_i2s_driver = {
751 .probe = dw_i2s_probe,
752 .remove = dw_i2s_remove,
753 .driver = {
754 .name = "designware-i2s",
755 .of_match_table = of_match_ptr(dw_i2s_of_match),
756 .pm = &dwc_pm_ops,
757 },
758 };
759
760 module_platform_driver(dw_i2s_driver);
761
762 MODULE_AUTHOR("Rajeev Kumar <rajeevkumar.linux@gmail.com>");
763 MODULE_DESCRIPTION("DESIGNWARE I2S SoC Interface");
764 MODULE_LICENSE("GPL");
765 MODULE_ALIAS("platform:designware_i2s");
Linux with added FPC-III support