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First Support on Ginger and OMAP TI
[linux-ginger.git] / sound / soc / s3c24xx / s3c24xx-i2s.c
blob40e2c4790f0de95b08d0e846678422151909e366
1 /*
2 * s3c24xx-i2s.c -- ALSA Soc Audio Layer
3 *
4 * (c) 2006 Wolfson Microelectronics PLC.
5 * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
6 *
7 * Copyright 2004-2005 Simtec Electronics
8 * http://armlinux.simtec.co.uk/
9 * Ben Dooks <ben@simtec.co.uk>
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
15 */
16
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/device.h>
20 #include <linux/delay.h>
21 #include <linux/clk.h>
22 #include <linux/jiffies.h>
23 #include <linux/io.h>
24 #include <linux/gpio.h>
25
26 #include <sound/core.h>
27 #include <sound/pcm.h>
28 #include <sound/pcm_params.h>
29 #include <sound/initval.h>
30 #include <sound/soc.h>
31
32 #include <mach/hardware.h>
33 #include <mach/regs-gpio.h>
34 #include <mach/regs-clock.h>
35 #include <plat/audio.h>
36 #include <asm/dma.h>
37 #include <mach/dma.h>
38
39 #include <plat/regs-iis.h>
40
41 #include "s3c24xx-pcm.h"
42 #include "s3c24xx-i2s.h"
43
44 static struct s3c2410_dma_client s3c24xx_dma_client_out = {
45 .name = "I2S PCM Stereo out"
46 };
47
48 static struct s3c2410_dma_client s3c24xx_dma_client_in = {
49 .name = "I2S PCM Stereo in"
50 };
51
52 static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_out = {
53 .client = &s3c24xx_dma_client_out,
54 .channel = DMACH_I2S_OUT,
55 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
56 .dma_size = 2,
57 };
58
59 static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_in = {
60 .client = &s3c24xx_dma_client_in,
61 .channel = DMACH_I2S_IN,
62 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
63 .dma_size = 2,
64 };
65
66 struct s3c24xx_i2s_info {
67 void __iomem *regs;
68 struct clk *iis_clk;
69 u32 iiscon;
70 u32 iismod;
71 u32 iisfcon;
72 u32 iispsr;
73 };
74 static struct s3c24xx_i2s_info s3c24xx_i2s;
75
76 static void s3c24xx_snd_txctrl(int on)
77 {
78 u32 iisfcon;
79 u32 iiscon;
80 u32 iismod;
81
82 pr_debug("Entered %s\n", __func__);
83
84 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
85 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
86 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
87
88 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
89
90 if (on) {
91 iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
92 iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
93 iiscon &= ~S3C2410_IISCON_TXIDLE;
94 iismod |= S3C2410_IISMOD_TXMODE;
95
96 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
97 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
98 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
99 } else {
100 /* note, we have to disable the FIFOs otherwise bad things
101 * seem to happen when the DMA stops. According to the
102 * Samsung supplied kernel, this should allow the DMA
103 * engine and FIFOs to reset. If this isn't allowed, the
104 * DMA engine will simply freeze randomly.
105 */
106
107 iisfcon &= ~S3C2410_IISFCON_TXENABLE;
108 iisfcon &= ~S3C2410_IISFCON_TXDMA;
109 iiscon |= S3C2410_IISCON_TXIDLE;
110 iiscon &= ~S3C2410_IISCON_TXDMAEN;
111 iismod &= ~S3C2410_IISMOD_TXMODE;
112
113 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
114 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
115 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
116 }
117
118 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
119 }
120
121 static void s3c24xx_snd_rxctrl(int on)
122 {
123 u32 iisfcon;
124 u32 iiscon;
125 u32 iismod;
126
127 pr_debug("Entered %s\n", __func__);
128
129 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
130 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
131 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
132
133 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
134
135 if (on) {
136 iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
137 iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
138 iiscon &= ~S3C2410_IISCON_RXIDLE;
139 iismod |= S3C2410_IISMOD_RXMODE;
140
141 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
142 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
143 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
144 } else {
145 /* note, we have to disable the FIFOs otherwise bad things
146 * seem to happen when the DMA stops. According to the
147 * Samsung supplied kernel, this should allow the DMA
148 * engine and FIFOs to reset. If this isn't allowed, the
149 * DMA engine will simply freeze randomly.
150 */
151
152 iisfcon &= ~S3C2410_IISFCON_RXENABLE;
153 iisfcon &= ~S3C2410_IISFCON_RXDMA;
154 iiscon |= S3C2410_IISCON_RXIDLE;
155 iiscon &= ~S3C2410_IISCON_RXDMAEN;
156 iismod &= ~S3C2410_IISMOD_RXMODE;
157
158 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
159 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
160 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
161 }
162
163 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
164 }
165
166 /*
167 * Wait for the LR signal to allow synchronisation to the L/R clock
168 * from the codec. May only be needed for slave mode.
169 */
170 static int s3c24xx_snd_lrsync(void)
171 {
172 u32 iiscon;
173 int timeout = 50; /* 5ms */
174
175 pr_debug("Entered %s\n", __func__);
176
177 while (1) {
178 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
179 if (iiscon & S3C2410_IISCON_LRINDEX)
180 break;
181
182 if (!timeout--)
183 return -ETIMEDOUT;
184 udelay(100);
185 }
186
187 return 0;
188 }
189
190 /*
191 * Check whether CPU is the master or slave
192 */
193 static inline int s3c24xx_snd_is_clkmaster(void)
194 {
195 pr_debug("Entered %s\n", __func__);
196
197 return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
198 }
199
200 /*
201 * Set S3C24xx I2S DAI format
202 */
203 static int s3c24xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
204 unsigned int fmt)
205 {
206 u32 iismod;
207
208 pr_debug("Entered %s\n", __func__);
209
210 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
211 pr_debug("hw_params r: IISMOD: %x \n", iismod);
212
213 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
214 case SND_SOC_DAIFMT_CBM_CFM:
215 iismod |= S3C2410_IISMOD_SLAVE;
216 break;
217 case SND_SOC_DAIFMT_CBS_CFS:
218 iismod &= ~S3C2410_IISMOD_SLAVE;
219 break;
220 default:
221 return -EINVAL;
222 }
223
224 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
225 case SND_SOC_DAIFMT_LEFT_J:
226 iismod |= S3C2410_IISMOD_MSB;
227 break;
228 case SND_SOC_DAIFMT_I2S:
229 iismod &= ~S3C2410_IISMOD_MSB;
230 break;
231 default:
232 return -EINVAL;
233 }
234
235 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
236 pr_debug("hw_params w: IISMOD: %x \n", iismod);
237 return 0;
238 }
239
240 static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
241 struct snd_pcm_hw_params *params,
242 struct snd_soc_dai *dai)
243 {
244 struct snd_soc_pcm_runtime *rtd = substream->private_data;
245 u32 iismod;
246
247 pr_debug("Entered %s\n", __func__);
248
249 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
250 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_out;
251 else
252 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_in;
253
254 /* Working copies of register */
255 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
256 pr_debug("hw_params r: IISMOD: %x\n", iismod);
257
258 switch (params_format(params)) {
259 case SNDRV_PCM_FORMAT_S8:
260 iismod &= ~S3C2410_IISMOD_16BIT;
261 ((struct s3c24xx_pcm_dma_params *)
262 rtd->dai->cpu_dai->dma_data)->dma_size = 1;
263 break;
264 case SNDRV_PCM_FORMAT_S16_LE:
265 iismod |= S3C2410_IISMOD_16BIT;
266 ((struct s3c24xx_pcm_dma_params *)
267 rtd->dai->cpu_dai->dma_data)->dma_size = 2;
268 break;
269 default:
270 return -EINVAL;
271 }
272
273 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
274 pr_debug("hw_params w: IISMOD: %x\n", iismod);
275 return 0;
276 }
277
278 static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
279 struct snd_soc_dai *dai)
280 {
281 int ret = 0;
282 struct snd_soc_pcm_runtime *rtd = substream->private_data;
283 int channel = ((struct s3c24xx_pcm_dma_params *)
284 rtd->dai->cpu_dai->dma_data)->channel;
285
286 pr_debug("Entered %s\n", __func__);
287
288 switch (cmd) {
289 case SNDRV_PCM_TRIGGER_START:
290 case SNDRV_PCM_TRIGGER_RESUME:
291 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
292 if (!s3c24xx_snd_is_clkmaster()) {
293 ret = s3c24xx_snd_lrsync();
294 if (ret)
295 goto exit_err;
296 }
297
298 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
299 s3c24xx_snd_rxctrl(1);
300 else
301 s3c24xx_snd_txctrl(1);
302
303 s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STARTED);
304 break;
305 case SNDRV_PCM_TRIGGER_STOP:
306 case SNDRV_PCM_TRIGGER_SUSPEND:
307 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
308 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
309 s3c24xx_snd_rxctrl(0);
310 else
311 s3c24xx_snd_txctrl(0);
312 break;
313 default:
314 ret = -EINVAL;
315 break;
316 }
317
318 exit_err:
319 return ret;
320 }
321
322 /*
323 * Set S3C24xx Clock source
324 */
325 static int s3c24xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
326 int clk_id, unsigned int freq, int dir)
327 {
328 u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
329
330 pr_debug("Entered %s\n", __func__);
331
332 iismod &= ~S3C2440_IISMOD_MPLL;
333
334 switch (clk_id) {
335 case S3C24XX_CLKSRC_PCLK:
336 break;
337 case S3C24XX_CLKSRC_MPLL:
338 iismod |= S3C2440_IISMOD_MPLL;
339 break;
340 default:
341 return -EINVAL;
342 }
343
344 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
345 return 0;
346 }
347
348 /*
349 * Set S3C24xx Clock dividers
350 */
351 static int s3c24xx_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
352 int div_id, int div)
353 {
354 u32 reg;
355
356 pr_debug("Entered %s\n", __func__);
357
358 switch (div_id) {
359 case S3C24XX_DIV_BCLK:
360 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
361 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
362 break;
363 case S3C24XX_DIV_MCLK:
364 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
365 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
366 break;
367 case S3C24XX_DIV_PRESCALER:
368 writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
369 reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
370 writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
371 break;
372 default:
373 return -EINVAL;
374 }
375
376 return 0;
377 }
378
379 /*
380 * To avoid duplicating clock code, allow machine driver to
381 * get the clockrate from here.
382 */
383 u32 s3c24xx_i2s_get_clockrate(void)
384 {
385 return clk_get_rate(s3c24xx_i2s.iis_clk);
386 }
387 EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
388
389 static int s3c24xx_i2s_probe(struct platform_device *pdev,
390 struct snd_soc_dai *dai)
391 {
392 pr_debug("Entered %s\n", __func__);
393
394 s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
395 if (s3c24xx_i2s.regs == NULL)
396 return -ENXIO;
397
398 s3c24xx_i2s.iis_clk = clk_get(&pdev->dev, "iis");
399 if (s3c24xx_i2s.iis_clk == NULL) {
400 pr_err("failed to get iis_clock\n");
401 iounmap(s3c24xx_i2s.regs);
402 return -ENODEV;
403 }
404 clk_enable(s3c24xx_i2s.iis_clk);
405
406 /* Configure the I2S pins in correct mode */
407 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
408 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
409 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
410 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
411 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
412
413 writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
414
415 s3c24xx_snd_txctrl(0);
416 s3c24xx_snd_rxctrl(0);
417
418 return 0;
419 }
420
421 #ifdef CONFIG_PM
422 static int s3c24xx_i2s_suspend(struct snd_soc_dai *cpu_dai)
423 {
424 pr_debug("Entered %s\n", __func__);
425
426 s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
427 s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
428 s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
429 s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
430
431 clk_disable(s3c24xx_i2s.iis_clk);
432
433 return 0;
434 }
435
436 static int s3c24xx_i2s_resume(struct snd_soc_dai *cpu_dai)
437 {
438 pr_debug("Entered %s\n", __func__);
439 clk_enable(s3c24xx_i2s.iis_clk);
440
441 writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
442 writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
443 writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
444 writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
445
446 return 0;
447 }
448 #else
449 #define s3c24xx_i2s_suspend NULL
450 #define s3c24xx_i2s_resume NULL
451 #endif
452
453
454 #define S3C24XX_I2S_RATES \
455 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
456 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
457 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
458
459 static struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
460 .trigger = s3c24xx_i2s_trigger,
461 .hw_params = s3c24xx_i2s_hw_params,
462 .set_fmt = s3c24xx_i2s_set_fmt,
463 .set_clkdiv = s3c24xx_i2s_set_clkdiv,
464 .set_sysclk = s3c24xx_i2s_set_sysclk,
465 };
466
467 struct snd_soc_dai s3c24xx_i2s_dai = {
468 .name = "s3c24xx-i2s",
469 .id = 0,
470 .probe = s3c24xx_i2s_probe,
471 .suspend = s3c24xx_i2s_suspend,
472 .resume = s3c24xx_i2s_resume,
473 .playback = {
474 .channels_min = 2,
475 .channels_max = 2,
476 .rates = S3C24XX_I2S_RATES,
477 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
478 .capture = {
479 .channels_min = 2,
480 .channels_max = 2,
481 .rates = S3C24XX_I2S_RATES,
482 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
483 .ops = &s3c24xx_i2s_dai_ops,
484 };
485 EXPORT_SYMBOL_GPL(s3c24xx_i2s_dai);
486
487 static int __init s3c24xx_i2s_init(void)
488 {
489 return snd_soc_register_dai(&s3c24xx_i2s_dai);
490 }
491 module_init(s3c24xx_i2s_init);
492
493 static void __exit s3c24xx_i2s_exit(void)
494 {
495 snd_soc_unregister_dai(&s3c24xx_i2s_dai);
496 }
497 module_exit(s3c24xx_i2s_exit);
498
499 /* Module information */
500 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
501 MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
502 MODULE_LICENSE("GPL");
Linux for Ginger Game Console