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Merge remote-tracking branch 'net/master'
[linux-2.6/next.git] / sound / soc / samsung / pcm.c
blob9c7e8b48aed6a4dc2bbc76d1955a5d56025eae9b
1 /* sound/soc/samsung/pcm.c
2 *
3 * ALSA SoC Audio Layer - S3C PCM-Controller driver
4 *
5 * Copyright (c) 2009 Samsung Electronics Co. Ltd
6 * Author: Jaswinder Singh <jassi.brar@samsung.com>
7 * based upon I2S drivers by Ben Dooks.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/io.h>
16
17 #include <sound/soc.h>
18 #include <sound/pcm_params.h>
19
20 #include <plat/audio.h>
21 #include <plat/dma.h>
22
23 #include "dma.h"
24 #include "pcm.h"
25
26 /*Register Offsets */
27 #define S3C_PCM_CTL 0x00
28 #define S3C_PCM_CLKCTL 0x04
29 #define S3C_PCM_TXFIFO 0x08
30 #define S3C_PCM_RXFIFO 0x0C
31 #define S3C_PCM_IRQCTL 0x10
32 #define S3C_PCM_IRQSTAT 0x14
33 #define S3C_PCM_FIFOSTAT 0x18
34 #define S3C_PCM_CLRINT 0x20
35
36 /* PCM_CTL Bit-Fields */
37 #define S3C_PCM_CTL_TXDIPSTICK_MASK 0x3f
38 #define S3C_PCM_CTL_TXDIPSTICK_SHIFT 13
39 #define S3C_PCM_CTL_RXDIPSTICK_MASK 0x3f
40 #define S3C_PCM_CTL_RXDIPSTICK_SHIFT 7
41 #define S3C_PCM_CTL_TXDMA_EN (0x1 << 6)
42 #define S3C_PCM_CTL_RXDMA_EN (0x1 << 5)
43 #define S3C_PCM_CTL_TXMSB_AFTER_FSYNC (0x1 << 4)
44 #define S3C_PCM_CTL_RXMSB_AFTER_FSYNC (0x1 << 3)
45 #define S3C_PCM_CTL_TXFIFO_EN (0x1 << 2)
46 #define S3C_PCM_CTL_RXFIFO_EN (0x1 << 1)
47 #define S3C_PCM_CTL_ENABLE (0x1 << 0)
48
49 /* PCM_CLKCTL Bit-Fields */
50 #define S3C_PCM_CLKCTL_SERCLK_EN (0x1 << 19)
51 #define S3C_PCM_CLKCTL_SERCLKSEL_PCLK (0x1 << 18)
52 #define S3C_PCM_CLKCTL_SCLKDIV_MASK 0x1ff
53 #define S3C_PCM_CLKCTL_SYNCDIV_MASK 0x1ff
54 #define S3C_PCM_CLKCTL_SCLKDIV_SHIFT 9
55 #define S3C_PCM_CLKCTL_SYNCDIV_SHIFT 0
56
57 /* PCM_TXFIFO Bit-Fields */
58 #define S3C_PCM_TXFIFO_DVALID (0x1 << 16)
59 #define S3C_PCM_TXFIFO_DATA_MSK (0xffff << 0)
60
61 /* PCM_RXFIFO Bit-Fields */
62 #define S3C_PCM_RXFIFO_DVALID (0x1 << 16)
63 #define S3C_PCM_RXFIFO_DATA_MSK (0xffff << 0)
64
65 /* PCM_IRQCTL Bit-Fields */
66 #define S3C_PCM_IRQCTL_IRQEN (0x1 << 14)
67 #define S3C_PCM_IRQCTL_WRDEN (0x1 << 12)
68 #define S3C_PCM_IRQCTL_TXEMPTYEN (0x1 << 11)
69 #define S3C_PCM_IRQCTL_TXALMSTEMPTYEN (0x1 << 10)
70 #define S3C_PCM_IRQCTL_TXFULLEN (0x1 << 9)
71 #define S3C_PCM_IRQCTL_TXALMSTFULLEN (0x1 << 8)
72 #define S3C_PCM_IRQCTL_TXSTARVEN (0x1 << 7)
73 #define S3C_PCM_IRQCTL_TXERROVRFLEN (0x1 << 6)
74 #define S3C_PCM_IRQCTL_RXEMPTEN (0x1 << 5)
75 #define S3C_PCM_IRQCTL_RXALMSTEMPTEN (0x1 << 4)
76 #define S3C_PCM_IRQCTL_RXFULLEN (0x1 << 3)
77 #define S3C_PCM_IRQCTL_RXALMSTFULLEN (0x1 << 2)
78 #define S3C_PCM_IRQCTL_RXSTARVEN (0x1 << 1)
79 #define S3C_PCM_IRQCTL_RXERROVRFLEN (0x1 << 0)
80
81 /* PCM_IRQSTAT Bit-Fields */
82 #define S3C_PCM_IRQSTAT_IRQPND (0x1 << 13)
83 #define S3C_PCM_IRQSTAT_WRD_XFER (0x1 << 12)
84 #define S3C_PCM_IRQSTAT_TXEMPTY (0x1 << 11)
85 #define S3C_PCM_IRQSTAT_TXALMSTEMPTY (0x1 << 10)
86 #define S3C_PCM_IRQSTAT_TXFULL (0x1 << 9)
87 #define S3C_PCM_IRQSTAT_TXALMSTFULL (0x1 << 8)
88 #define S3C_PCM_IRQSTAT_TXSTARV (0x1 << 7)
89 #define S3C_PCM_IRQSTAT_TXERROVRFL (0x1 << 6)
90 #define S3C_PCM_IRQSTAT_RXEMPT (0x1 << 5)
91 #define S3C_PCM_IRQSTAT_RXALMSTEMPT (0x1 << 4)
92 #define S3C_PCM_IRQSTAT_RXFULL (0x1 << 3)
93 #define S3C_PCM_IRQSTAT_RXALMSTFULL (0x1 << 2)
94 #define S3C_PCM_IRQSTAT_RXSTARV (0x1 << 1)
95 #define S3C_PCM_IRQSTAT_RXERROVRFL (0x1 << 0)
96
97 /* PCM_FIFOSTAT Bit-Fields */
98 #define S3C_PCM_FIFOSTAT_TXCNT_MSK (0x3f << 14)
99 #define S3C_PCM_FIFOSTAT_TXFIFOEMPTY (0x1 << 13)
100 #define S3C_PCM_FIFOSTAT_TXFIFOALMSTEMPTY (0x1 << 12)
101 #define S3C_PCM_FIFOSTAT_TXFIFOFULL (0x1 << 11)
102 #define S3C_PCM_FIFOSTAT_TXFIFOALMSTFULL (0x1 << 10)
103 #define S3C_PCM_FIFOSTAT_RXCNT_MSK (0x3f << 4)
104 #define S3C_PCM_FIFOSTAT_RXFIFOEMPTY (0x1 << 3)
105 #define S3C_PCM_FIFOSTAT_RXFIFOALMSTEMPTY (0x1 << 2)
106 #define S3C_PCM_FIFOSTAT_RXFIFOFULL (0x1 << 1)
107 #define S3C_PCM_FIFOSTAT_RXFIFOALMSTFULL (0x1 << 0)
108
109 /**
110 * struct s3c_pcm_info - S3C PCM Controller information
111 * @dev: The parent device passed to use from the probe.
112 * @regs: The pointer to the device register block.
113 * @dma_playback: DMA information for playback channel.
114 * @dma_capture: DMA information for capture channel.
115 */
116 struct s3c_pcm_info {
117 spinlock_t lock;
118 struct device *dev;
119 void __iomem *regs;
120
121 unsigned int sclk_per_fs;
122
123 /* Whether to keep PCMSCLK enabled even when idle(no active xfer) */
124 unsigned int idleclk;
125
126 struct clk *pclk;
127 struct clk *cclk;
128
129 struct s3c_dma_params *dma_playback;
130 struct s3c_dma_params *dma_capture;
131 };
132
133 static struct s3c2410_dma_client s3c_pcm_dma_client_out = {
134 .name = "PCM Stereo out"
135 };
136
137 static struct s3c2410_dma_client s3c_pcm_dma_client_in = {
138 .name = "PCM Stereo in"
139 };
140
141 static struct s3c_dma_params s3c_pcm_stereo_out[] = {
142 [0] = {
143 .client = &s3c_pcm_dma_client_out,
144 .dma_size = 4,
145 },
146 [1] = {
147 .client = &s3c_pcm_dma_client_out,
148 .dma_size = 4,
149 },
150 };
151
152 static struct s3c_dma_params s3c_pcm_stereo_in[] = {
153 [0] = {
154 .client = &s3c_pcm_dma_client_in,
155 .dma_size = 4,
156 },
157 [1] = {
158 .client = &s3c_pcm_dma_client_in,
159 .dma_size = 4,
160 },
161 };
162
163 static struct s3c_pcm_info s3c_pcm[2];
164
165 static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
166 {
167 void __iomem *regs = pcm->regs;
168 u32 ctl, clkctl;
169
170 clkctl = readl(regs + S3C_PCM_CLKCTL);
171 ctl = readl(regs + S3C_PCM_CTL);
172 ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
173 << S3C_PCM_CTL_TXDIPSTICK_SHIFT);
174
175 if (on) {
176 ctl |= S3C_PCM_CTL_TXDMA_EN;
177 ctl |= S3C_PCM_CTL_TXFIFO_EN;
178 ctl |= S3C_PCM_CTL_ENABLE;
179 ctl |= (0x4<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
180 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
181 } else {
182 ctl &= ~S3C_PCM_CTL_TXDMA_EN;
183 ctl &= ~S3C_PCM_CTL_TXFIFO_EN;
184
185 if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
186 ctl &= ~S3C_PCM_CTL_ENABLE;
187 if (!pcm->idleclk)
188 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
189 }
190 }
191
192 writel(clkctl, regs + S3C_PCM_CLKCTL);
193 writel(ctl, regs + S3C_PCM_CTL);
194 }
195
196 static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
197 {
198 void __iomem *regs = pcm->regs;
199 u32 ctl, clkctl;
200
201 ctl = readl(regs + S3C_PCM_CTL);
202 clkctl = readl(regs + S3C_PCM_CLKCTL);
203 ctl &= ~(S3C_PCM_CTL_RXDIPSTICK_MASK
204 << S3C_PCM_CTL_RXDIPSTICK_SHIFT);
205
206 if (on) {
207 ctl |= S3C_PCM_CTL_RXDMA_EN;
208 ctl |= S3C_PCM_CTL_RXFIFO_EN;
209 ctl |= S3C_PCM_CTL_ENABLE;
210 ctl |= (0x20<<S3C_PCM_CTL_RXDIPSTICK_SHIFT);
211 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
212 } else {
213 ctl &= ~S3C_PCM_CTL_RXDMA_EN;
214 ctl &= ~S3C_PCM_CTL_RXFIFO_EN;
215
216 if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
217 ctl &= ~S3C_PCM_CTL_ENABLE;
218 if (!pcm->idleclk)
219 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
220 }
221 }
222
223 writel(clkctl, regs + S3C_PCM_CLKCTL);
224 writel(ctl, regs + S3C_PCM_CTL);
225 }
226
227 static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
228 struct snd_soc_dai *dai)
229 {
230 struct snd_soc_pcm_runtime *rtd = substream->private_data;
231 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
232 unsigned long flags;
233
234 dev_dbg(pcm->dev, "Entered %s\n", __func__);
235
236 switch (cmd) {
237 case SNDRV_PCM_TRIGGER_START:
238 case SNDRV_PCM_TRIGGER_RESUME:
239 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
240 spin_lock_irqsave(&pcm->lock, flags);
241
242 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
243 s3c_pcm_snd_rxctrl(pcm, 1);
244 else
245 s3c_pcm_snd_txctrl(pcm, 1);
246
247 spin_unlock_irqrestore(&pcm->lock, flags);
248 break;
249
250 case SNDRV_PCM_TRIGGER_STOP:
251 case SNDRV_PCM_TRIGGER_SUSPEND:
252 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
253 spin_lock_irqsave(&pcm->lock, flags);
254
255 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
256 s3c_pcm_snd_rxctrl(pcm, 0);
257 else
258 s3c_pcm_snd_txctrl(pcm, 0);
259
260 spin_unlock_irqrestore(&pcm->lock, flags);
261 break;
262
263 default:
264 return -EINVAL;
265 }
266
267 return 0;
268 }
269
270 static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
271 struct snd_pcm_hw_params *params,
272 struct snd_soc_dai *socdai)
273 {
274 struct snd_soc_pcm_runtime *rtd = substream->private_data;
275 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
276 struct s3c_dma_params *dma_data;
277 void __iomem *regs = pcm->regs;
278 struct clk *clk;
279 int sclk_div, sync_div;
280 unsigned long flags;
281 u32 clkctl;
282
283 dev_dbg(pcm->dev, "Entered %s\n", __func__);
284
285 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
286 dma_data = pcm->dma_playback;
287 else
288 dma_data = pcm->dma_capture;
289
290 snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
291
292 /* Strictly check for sample size */
293 switch (params_format(params)) {
294 case SNDRV_PCM_FORMAT_S16_LE:
295 break;
296 default:
297 return -EINVAL;
298 }
299
300 spin_lock_irqsave(&pcm->lock, flags);
301
302 /* Get hold of the PCMSOURCE_CLK */
303 clkctl = readl(regs + S3C_PCM_CLKCTL);
304 if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
305 clk = pcm->pclk;
306 else
307 clk = pcm->cclk;
308
309 /* Set the SCLK divider */
310 sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
311 params_rate(params) / 2 - 1;
312
313 clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
314 << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
315 clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
316 << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
317
318 /* Set the SYNC divider */
319 sync_div = pcm->sclk_per_fs - 1;
320
321 clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
322 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
323 clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
324 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
325
326 writel(clkctl, regs + S3C_PCM_CLKCTL);
327
328 spin_unlock_irqrestore(&pcm->lock, flags);
329
330 dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
331 clk_get_rate(clk), pcm->sclk_per_fs,
332 sclk_div, sync_div);
333
334 return 0;
335 }
336
337 static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
338 unsigned int fmt)
339 {
340 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
341 void __iomem *regs = pcm->regs;
342 unsigned long flags;
343 int ret = 0;
344 u32 ctl;
345
346 dev_dbg(pcm->dev, "Entered %s\n", __func__);
347
348 spin_lock_irqsave(&pcm->lock, flags);
349
350 ctl = readl(regs + S3C_PCM_CTL);
351
352 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
353 case SND_SOC_DAIFMT_IB_NF:
354 /* Nothing to do, IB_NF by default */
355 break;
356 default:
357 dev_err(pcm->dev, "Unsupported clock inversion!\n");
358 ret = -EINVAL;
359 goto exit;
360 }
361
362 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
363 case SND_SOC_DAIFMT_CBS_CFS:
364 /* Nothing to do, Master by default */
365 break;
366 default:
367 dev_err(pcm->dev, "Unsupported master/slave format!\n");
368 ret = -EINVAL;
369 goto exit;
370 }
371
372 switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
373 case SND_SOC_DAIFMT_CONT:
374 pcm->idleclk = 1;
375 break;
376 case SND_SOC_DAIFMT_GATED:
377 pcm->idleclk = 0;
378 break;
379 default:
380 dev_err(pcm->dev, "Invalid Clock gating request!\n");
381 ret = -EINVAL;
382 goto exit;
383 }
384
385 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
386 case SND_SOC_DAIFMT_DSP_A:
387 ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
388 ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
389 break;
390 case SND_SOC_DAIFMT_DSP_B:
391 ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
392 ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
393 break;
394 default:
395 dev_err(pcm->dev, "Unsupported data format!\n");
396 ret = -EINVAL;
397 goto exit;
398 }
399
400 writel(ctl, regs + S3C_PCM_CTL);
401
402 exit:
403 spin_unlock_irqrestore(&pcm->lock, flags);
404
405 return ret;
406 }
407
408 static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
409 int div_id, int div)
410 {
411 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
412
413 switch (div_id) {
414 case S3C_PCM_SCLK_PER_FS:
415 pcm->sclk_per_fs = div;
416 break;
417
418 default:
419 return -EINVAL;
420 }
421
422 return 0;
423 }
424
425 static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
426 int clk_id, unsigned int freq, int dir)
427 {
428 struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
429 void __iomem *regs = pcm->regs;
430 u32 clkctl = readl(regs + S3C_PCM_CLKCTL);
431
432 switch (clk_id) {
433 case S3C_PCM_CLKSRC_PCLK:
434 clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
435 break;
436
437 case S3C_PCM_CLKSRC_MUX:
438 clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
439
440 if (clk_get_rate(pcm->cclk) != freq)
441 clk_set_rate(pcm->cclk, freq);
442
443 break;
444
445 default:
446 return -EINVAL;
447 }
448
449 writel(clkctl, regs + S3C_PCM_CLKCTL);
450
451 return 0;
452 }
453
454 static struct snd_soc_dai_ops s3c_pcm_dai_ops = {
455 .set_sysclk = s3c_pcm_set_sysclk,
456 .set_clkdiv = s3c_pcm_set_clkdiv,
457 .trigger = s3c_pcm_trigger,
458 .hw_params = s3c_pcm_hw_params,
459 .set_fmt = s3c_pcm_set_fmt,
460 };
461
462 #define S3C_PCM_RATES SNDRV_PCM_RATE_8000_96000
463
464 #define S3C_PCM_DAI_DECLARE \
465 .symmetric_rates = 1, \
466 .ops = &s3c_pcm_dai_ops, \
467 .playback = { \
468 .channels_min = 2, \
469 .channels_max = 2, \
470 .rates = S3C_PCM_RATES, \
471 .formats = SNDRV_PCM_FMTBIT_S16_LE, \
472 }, \
473 .capture = { \
474 .channels_min = 2, \
475 .channels_max = 2, \
476 .rates = S3C_PCM_RATES, \
477 .formats = SNDRV_PCM_FMTBIT_S16_LE, \
478 }
479
480 struct snd_soc_dai_driver s3c_pcm_dai[] = {
481 [0] = {
482 .name = "samsung-pcm.0",
483 S3C_PCM_DAI_DECLARE,
484 },
485 [1] = {
486 .name = "samsung-pcm.1",
487 S3C_PCM_DAI_DECLARE,
488 },
489 };
490 EXPORT_SYMBOL_GPL(s3c_pcm_dai);
491
492 static __devinit int s3c_pcm_dev_probe(struct platform_device *pdev)
493 {
494 struct s3c_pcm_info *pcm;
495 struct resource *mem_res, *dmatx_res, *dmarx_res;
496 struct s3c_audio_pdata *pcm_pdata;
497 int ret;
498
499 /* Check for valid device index */
500 if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) {
501 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
502 return -EINVAL;
503 }
504
505 pcm_pdata = pdev->dev.platform_data;
506
507 /* Check for availability of necessary resource */
508 dmatx_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
509 if (!dmatx_res) {
510 dev_err(&pdev->dev, "Unable to get PCM-TX dma resource\n");
511 return -ENXIO;
512 }
513
514 dmarx_res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
515 if (!dmarx_res) {
516 dev_err(&pdev->dev, "Unable to get PCM-RX dma resource\n");
517 return -ENXIO;
518 }
519
520 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
521 if (!mem_res) {
522 dev_err(&pdev->dev, "Unable to get register resource\n");
523 return -ENXIO;
524 }
525
526 if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
527 dev_err(&pdev->dev, "Unable to configure gpio\n");
528 return -EINVAL;
529 }
530
531 pcm = &s3c_pcm[pdev->id];
532 pcm->dev = &pdev->dev;
533
534 spin_lock_init(&pcm->lock);
535
536 /* Default is 128fs */
537 pcm->sclk_per_fs = 128;
538
539 pcm->cclk = clk_get(&pdev->dev, "audio-bus");
540 if (IS_ERR(pcm->cclk)) {
541 dev_err(&pdev->dev, "failed to get audio-bus\n");
542 ret = PTR_ERR(pcm->cclk);
543 goto err1;
544 }
545 clk_enable(pcm->cclk);
546
547 /* record our pcm structure for later use in the callbacks */
548 dev_set_drvdata(&pdev->dev, pcm);
549
550 if (!request_mem_region(mem_res->start,
551 resource_size(mem_res), "samsung-pcm")) {
552 dev_err(&pdev->dev, "Unable to request register region\n");
553 ret = -EBUSY;
554 goto err2;
555 }
556
557 pcm->regs = ioremap(mem_res->start, 0x100);
558 if (pcm->regs == NULL) {
559 dev_err(&pdev->dev, "cannot ioremap registers\n");
560 ret = -ENXIO;
561 goto err3;
562 }
563
564 pcm->pclk = clk_get(&pdev->dev, "pcm");
565 if (IS_ERR(pcm->pclk)) {
566 dev_err(&pdev->dev, "failed to get pcm_clock\n");
567 ret = -ENOENT;
568 goto err4;
569 }
570 clk_enable(pcm->pclk);
571
572 ret = snd_soc_register_dai(&pdev->dev, &s3c_pcm_dai[pdev->id]);
573 if (ret != 0) {
574 dev_err(&pdev->dev, "failed to get pcm_clock\n");
575 goto err5;
576 }
577
578 s3c_pcm_stereo_in[pdev->id].dma_addr = mem_res->start
579 + S3C_PCM_RXFIFO;
580 s3c_pcm_stereo_out[pdev->id].dma_addr = mem_res->start
581 + S3C_PCM_TXFIFO;
582
583 s3c_pcm_stereo_in[pdev->id].channel = dmarx_res->start;
584 s3c_pcm_stereo_out[pdev->id].channel = dmatx_res->start;
585
586 pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
587 pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];
588
589 return 0;
590
591 err5:
592 clk_disable(pcm->pclk);
593 clk_put(pcm->pclk);
594 err4:
595 iounmap(pcm->regs);
596 err3:
597 release_mem_region(mem_res->start, resource_size(mem_res));
598 err2:
599 clk_disable(pcm->cclk);
600 clk_put(pcm->cclk);
601 err1:
602 return ret;
603 }
604
605 static __devexit int s3c_pcm_dev_remove(struct platform_device *pdev)
606 {
607 struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
608 struct resource *mem_res;
609
610 snd_soc_unregister_dai(&pdev->dev);
611
612 iounmap(pcm->regs);
613
614 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
615 release_mem_region(mem_res->start, resource_size(mem_res));
616
617 clk_disable(pcm->cclk);
618 clk_disable(pcm->pclk);
619 clk_put(pcm->pclk);
620 clk_put(pcm->cclk);
621
622 return 0;
623 }
624
625 static struct platform_driver s3c_pcm_driver = {
626 .probe = s3c_pcm_dev_probe,
627 .remove = s3c_pcm_dev_remove,
628 .driver = {
629 .name = "samsung-pcm",
630 .owner = THIS_MODULE,
631 },
632 };
633
634 static int __init s3c_pcm_init(void)
635 {
636 return platform_driver_register(&s3c_pcm_driver);
637 }
638 module_init(s3c_pcm_init);
639
640 static void __exit s3c_pcm_exit(void)
641 {
642 platform_driver_unregister(&s3c_pcm_driver);
643 }
644 module_exit(s3c_pcm_exit);
645
646 /* Module information */
647 MODULE_AUTHOR("Jaswinder Singh, <jassi.brar@samsung.com>");
648 MODULE_DESCRIPTION("S3C PCM Controller Driver");
649 MODULE_LICENSE("GPL");
650 MODULE_ALIAS("platform:samsung-pcm");
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