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Diffstat (limited to 'sound/soc/samsung/s3c24xx-i2s.c')
-rw-r--r--sound/soc/samsung/s3c24xx-i2s.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/sound/soc/samsung/s3c24xx-i2s.c b/sound/soc/samsung/s3c24xx-i2s.c
new file mode 100644
index 000000000000..13e41ed8e22b
--- /dev/null
+++ b/sound/soc/samsung/s3c24xx-i2s.c
@@ -0,0 +1,519 @@
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
36#include <asm/dma.h>
37#include <mach/dma.h>
38
39#include <plat/regs-iis.h>
40
41#include "dma.h"
42#include "s3c24xx-i2s.h"
43
44static struct s3c2410_dma_client s3c24xx_dma_client_out = {
45 .name = "I2S PCM Stereo out"
46};
47
48static struct s3c2410_dma_client s3c24xx_dma_client_in = {
49 .name = "I2S PCM Stereo in"
50};
51
52static struct s3c_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
59static struct s3c_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
66struct 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};
74static struct s3c24xx_i2s_info s3c24xx_i2s;
75
76static 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
121static 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 */
170static 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 */
193static 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 */
203static 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
240static 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 struct s3c_dma_params *dma_data;
246 u32 iismod;
247
248 pr_debug("Entered %s\n", __func__);
249
250 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
251 dma_data = &s3c24xx_i2s_pcm_stereo_out;
252 else
253 dma_data = &s3c24xx_i2s_pcm_stereo_in;
254
255 snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
256
257 /* Working copies of register */
258 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
259 pr_debug("hw_params r: IISMOD: %x\n", iismod);
260
261 switch (params_format(params)) {
262 case SNDRV_PCM_FORMAT_S8:
263 iismod &= ~S3C2410_IISMOD_16BIT;
264 dma_data->dma_size = 1;
265 break;
266 case SNDRV_PCM_FORMAT_S16_LE:
267 iismod |= S3C2410_IISMOD_16BIT;
268 dma_data->dma_size = 2;
269 break;
270 default:
271 return -EINVAL;
272 }
273
274 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
275 pr_debug("hw_params w: IISMOD: %x\n", iismod);
276 return 0;
277}
278
279static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
280 struct snd_soc_dai *dai)
281{
282 int ret = 0;
283 struct s3c_dma_params *dma_data =
284 snd_soc_dai_get_dma_data(dai, substream);
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(dma_data->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
318exit_err:
319 return ret;
320}
321
322/*
323 * Set S3C24xx Clock source
324 */
325static 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 */
351static 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 */
383u32 s3c24xx_i2s_get_clockrate(void)
384{
385 return clk_get_rate(s3c24xx_i2s.iis_clk);
386}
387EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
388
389static int s3c24xx_i2s_probe(struct snd_soc_dai *dai)
390{
391 pr_debug("Entered %s\n", __func__);
392
393 s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
394 if (s3c24xx_i2s.regs == NULL)
395 return -ENXIO;
396
397 s3c24xx_i2s.iis_clk = clk_get(dai->dev, "iis");
398 if (s3c24xx_i2s.iis_clk == NULL) {
399 pr_err("failed to get iis_clock\n");
400 iounmap(s3c24xx_i2s.regs);
401 return -ENODEV;
402 }
403 clk_enable(s3c24xx_i2s.iis_clk);
404
405 /* Configure the I2S pins in correct mode */
406 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
407 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
408 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
409 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
410 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
411
412 writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
413
414 s3c24xx_snd_txctrl(0);
415 s3c24xx_snd_rxctrl(0);
416
417 return 0;
418}
419
420#ifdef CONFIG_PM
421static int s3c24xx_i2s_suspend(struct snd_soc_dai *cpu_dai)
422{
423 pr_debug("Entered %s\n", __func__);
424
425 s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
426 s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
427 s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
428 s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
429
430 clk_disable(s3c24xx_i2s.iis_clk);
431
432 return 0;
433}
434
435static int s3c24xx_i2s_resume(struct snd_soc_dai *cpu_dai)
436{
437 pr_debug("Entered %s\n", __func__);
438 clk_enable(s3c24xx_i2s.iis_clk);
439
440 writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
441 writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
442 writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
443 writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
444
445 return 0;
446}
447#else
448#define s3c24xx_i2s_suspend NULL
449#define s3c24xx_i2s_resume NULL
450#endif
451
452
453#define S3C24XX_I2S_RATES \
454 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
455 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
456 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
457
458static struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
459 .trigger = s3c24xx_i2s_trigger,
460 .hw_params = s3c24xx_i2s_hw_params,
461 .set_fmt = s3c24xx_i2s_set_fmt,
462 .set_clkdiv = s3c24xx_i2s_set_clkdiv,
463 .set_sysclk = s3c24xx_i2s_set_sysclk,
464};
465
466static struct snd_soc_dai_driver s3c24xx_i2s_dai = {
467 .probe = s3c24xx_i2s_probe,
468 .suspend = s3c24xx_i2s_suspend,
469 .resume = s3c24xx_i2s_resume,
470 .playback = {
471 .channels_min = 2,
472 .channels_max = 2,
473 .rates = S3C24XX_I2S_RATES,
474 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
475 .capture = {
476 .channels_min = 2,
477 .channels_max = 2,
478 .rates = S3C24XX_I2S_RATES,
479 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
480 .ops = &s3c24xx_i2s_dai_ops,
481};
482
483static __devinit int s3c24xx_iis_dev_probe(struct platform_device *pdev)
484{
485 return snd_soc_register_dai(&pdev->dev, &s3c24xx_i2s_dai);
486}
487
488static __devexit int s3c24xx_iis_dev_remove(struct platform_device *pdev)
489{
490 snd_soc_unregister_dai(&pdev->dev);
491 return 0;
492}
493
494static struct platform_driver s3c24xx_iis_driver = {
495 .probe = s3c24xx_iis_dev_probe,
496 .remove = s3c24xx_iis_dev_remove,
497 .driver = {
498 .name = "s3c24xx-iis",
499 .owner = THIS_MODULE,
500 },
501};
502
503static int __init s3c24xx_i2s_init(void)
504{
505 return platform_driver_register(&s3c24xx_iis_driver);
506}
507module_init(s3c24xx_i2s_init);
508
509static void __exit s3c24xx_i2s_exit(void)
510{
511 platform_driver_unregister(&s3c24xx_iis_driver);
512}
513module_exit(s3c24xx_i2s_exit);
514
515/* Module information */
516MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
517MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
518MODULE_LICENSE("GPL");
519MODULE_ALIAS("platform:s3c24xx-iis");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-10 23:21:14 -0500