tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/delay.h>
18#include <linux/clk.h>
19#include <linux/io.h>
20#include <linux/gpio.h>
21#include <linux/module.h>
22
23#include <sound/soc.h>
24#include <sound/pcm_params.h>
25
26#include <mach/dma.h>
27#include "regs-iis.h"
28
29#include "dma.h"
30#include "s3c24xx-i2s.h"
31
32static struct s3c2410_dma_client s3c24xx_dma_client_out = {
33 .name = "I2S PCM Stereo out"
34};
35
36static struct s3c2410_dma_client s3c24xx_dma_client_in = {
37 .name = "I2S PCM Stereo in"
38};
39
40static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_out = {
41 .client = &s3c24xx_dma_client_out,
42 .channel = DMACH_I2S_OUT,
43 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
44 .dma_size = 2,
45};
46
47static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_in = {
48 .client = &s3c24xx_dma_client_in,
49 .channel = DMACH_I2S_IN,
50 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
51 .dma_size = 2,
52};
53
54struct s3c24xx_i2s_info {
55 void __iomem *regs;
56 struct clk *iis_clk;
57 u32 iiscon;
58 u32 iismod;
59 u32 iisfcon;
60 u32 iispsr;
61};
62static struct s3c24xx_i2s_info s3c24xx_i2s;
63
64static void s3c24xx_snd_txctrl(int on)
65{
66 u32 iisfcon;
67 u32 iiscon;
68 u32 iismod;
69
70 pr_debug("Entered %s\n", __func__);
71
72 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
73 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
74 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
75
76 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
77
78 if (on) {
79 iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
80 iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
81 iiscon &= ~S3C2410_IISCON_TXIDLE;
82 iismod |= S3C2410_IISMOD_TXMODE;
83
84 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
85 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
86 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
87 } else {
88 /* note, we have to disable the FIFOs otherwise bad things
89 * seem to happen when the DMA stops. According to the
90 * Samsung supplied kernel, this should allow the DMA
91 * engine and FIFOs to reset. If this isn't allowed, the
92 * DMA engine will simply freeze randomly.
93 */
94
95 iisfcon &= ~S3C2410_IISFCON_TXENABLE;
96 iisfcon &= ~S3C2410_IISFCON_TXDMA;
97 iiscon |= S3C2410_IISCON_TXIDLE;
98 iiscon &= ~S3C2410_IISCON_TXDMAEN;
99 iismod &= ~S3C2410_IISMOD_TXMODE;
100
101 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
102 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
103 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
104 }
105
106 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
107}
108
109static void s3c24xx_snd_rxctrl(int on)
110{
111 u32 iisfcon;
112 u32 iiscon;
113 u32 iismod;
114
115 pr_debug("Entered %s\n", __func__);
116
117 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
118 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
119 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
120
121 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
122
123 if (on) {
124 iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
125 iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
126 iiscon &= ~S3C2410_IISCON_RXIDLE;
127 iismod |= S3C2410_IISMOD_RXMODE;
128
129 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
130 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
131 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
132 } else {
133 /* note, we have to disable the FIFOs otherwise bad things
134 * seem to happen when the DMA stops. According to the
135 * Samsung supplied kernel, this should allow the DMA
136 * engine and FIFOs to reset. If this isn't allowed, the
137 * DMA engine will simply freeze randomly.
138 */
139
140 iisfcon &= ~S3C2410_IISFCON_RXENABLE;
141 iisfcon &= ~S3C2410_IISFCON_RXDMA;
142 iiscon |= S3C2410_IISCON_RXIDLE;
143 iiscon &= ~S3C2410_IISCON_RXDMAEN;
144 iismod &= ~S3C2410_IISMOD_RXMODE;
145
146 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
147 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
148 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
149 }
150
151 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
152}
153
154/*
155 * Wait for the LR signal to allow synchronisation to the L/R clock
156 * from the codec. May only be needed for slave mode.
157 */
158static int s3c24xx_snd_lrsync(void)
159{
160 u32 iiscon;
161 int timeout = 50; /* 5ms */
162
163 pr_debug("Entered %s\n", __func__);
164
165 while (1) {
166 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
167 if (iiscon & S3C2410_IISCON_LRINDEX)
168 break;
169
170 if (!timeout--)
171 return -ETIMEDOUT;
172 udelay(100);
173 }
174
175 return 0;
176}
177
178/*
179 * Check whether CPU is the master or slave
180 */
181static inline int s3c24xx_snd_is_clkmaster(void)
182{
183 pr_debug("Entered %s\n", __func__);
184
185 return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
186}
187
188/*
189 * Set S3C24xx I2S DAI format
190 */
191static int s3c24xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
192 unsigned int fmt)
193{
194 u32 iismod;
195
196 pr_debug("Entered %s\n", __func__);
197
198 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
199 pr_debug("hw_params r: IISMOD: %x \n", iismod);
200
201 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
202 case SND_SOC_DAIFMT_CBM_CFM:
203 iismod |= S3C2410_IISMOD_SLAVE;
204 break;
205 case SND_SOC_DAIFMT_CBS_CFS:
206 iismod &= ~S3C2410_IISMOD_SLAVE;
207 break;
208 default:
209 return -EINVAL;
210 }
211
212 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
213 case SND_SOC_DAIFMT_LEFT_J:
214 iismod |= S3C2410_IISMOD_MSB;
215 break;
216 case SND_SOC_DAIFMT_I2S:
217 iismod &= ~S3C2410_IISMOD_MSB;
218 break;
219 default:
220 return -EINVAL;
221 }
222
223 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
224 pr_debug("hw_params w: IISMOD: %x \n", iismod);
225 return 0;
226}
227
228static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
229 struct snd_pcm_hw_params *params,
230 struct snd_soc_dai *dai)
231{
232 struct snd_soc_pcm_runtime *rtd = substream->private_data;
233 struct s3c_dma_params *dma_data;
234 u32 iismod;
235
236 pr_debug("Entered %s\n", __func__);
237
238 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
239 dma_data = &s3c24xx_i2s_pcm_stereo_out;
240 else
241 dma_data = &s3c24xx_i2s_pcm_stereo_in;
242
243 snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
244
245 /* Working copies of register */
246 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
247 pr_debug("hw_params r: IISMOD: %x\n", iismod);
248
249 switch (params_format(params)) {
250 case SNDRV_PCM_FORMAT_S8:
251 iismod &= ~S3C2410_IISMOD_16BIT;
252 dma_data->dma_size = 1;
253 break;
254 case SNDRV_PCM_FORMAT_S16_LE:
255 iismod |= S3C2410_IISMOD_16BIT;
256 dma_data->dma_size = 2;
257 break;
258 default:
259 return -EINVAL;
260 }
261
262 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
263 pr_debug("hw_params w: IISMOD: %x\n", iismod);
264 return 0;
265}
266
267static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
268 struct snd_soc_dai *dai)
269{
270 int ret = 0;
271 struct s3c_dma_params *dma_data =
272 snd_soc_dai_get_dma_data(dai, substream);
273
274 pr_debug("Entered %s\n", __func__);
275
276 switch (cmd) {
277 case SNDRV_PCM_TRIGGER_START:
278 case SNDRV_PCM_TRIGGER_RESUME:
279 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
280 if (!s3c24xx_snd_is_clkmaster()) {
281 ret = s3c24xx_snd_lrsync();
282 if (ret)
283 goto exit_err;
284 }
285
286 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
287 s3c24xx_snd_rxctrl(1);
288 else
289 s3c24xx_snd_txctrl(1);
290
291 s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
292 break;
293 case SNDRV_PCM_TRIGGER_STOP:
294 case SNDRV_PCM_TRIGGER_SUSPEND:
295 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
296 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
297 s3c24xx_snd_rxctrl(0);
298 else
299 s3c24xx_snd_txctrl(0);
300 break;
301 default:
302 ret = -EINVAL;
303 break;
304 }
305
306exit_err:
307 return ret;
308}
309
310/*
311 * Set S3C24xx Clock source
312 */
313static int s3c24xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
314 int clk_id, unsigned int freq, int dir)
315{
316 u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
317
318 pr_debug("Entered %s\n", __func__);
319
320 iismod &= ~S3C2440_IISMOD_MPLL;
321
322 switch (clk_id) {
323 case S3C24XX_CLKSRC_PCLK:
324 break;
325 case S3C24XX_CLKSRC_MPLL:
326 iismod |= S3C2440_IISMOD_MPLL;
327 break;
328 default:
329 return -EINVAL;
330 }
331
332 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
333 return 0;
334}
335
336/*
337 * Set S3C24xx Clock dividers
338 */
339static int s3c24xx_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
340 int div_id, int div)
341{
342 u32 reg;
343
344 pr_debug("Entered %s\n", __func__);
345
346 switch (div_id) {
347 case S3C24XX_DIV_BCLK:
348 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
349 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
350 break;
351 case S3C24XX_DIV_MCLK:
352 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
353 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
354 break;
355 case S3C24XX_DIV_PRESCALER:
356 writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
357 reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
358 writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
359 break;
360 default:
361 return -EINVAL;
362 }
363
364 return 0;
365}
366
367/*
368 * To avoid duplicating clock code, allow machine driver to
369 * get the clockrate from here.
370 */
371u32 s3c24xx_i2s_get_clockrate(void)
372{
373 return clk_get_rate(s3c24xx_i2s.iis_clk);
374}
375EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
376
377static int s3c24xx_i2s_probe(struct snd_soc_dai *dai)
378{
379 pr_debug("Entered %s\n", __func__);
380
381 s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
382 if (s3c24xx_i2s.regs == NULL)
383 return -ENXIO;
384
385 s3c24xx_i2s.iis_clk = clk_get(dai->dev, "iis");
386 if (IS_ERR(s3c24xx_i2s.iis_clk)) {
387 pr_err("failed to get iis_clock\n");
388 iounmap(s3c24xx_i2s.regs);
389 return PTR_ERR(s3c24xx_i2s.iis_clk);
390 }
391 clk_enable(s3c24xx_i2s.iis_clk);
392
393 /* Configure the I2S pins (GPE0...GPE4) in correct mode */
394 s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
395 S3C_GPIO_PULL_NONE);
396
397 writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
398
399 s3c24xx_snd_txctrl(0);
400 s3c24xx_snd_rxctrl(0);
401
402 return 0;
403}
404
405#ifdef CONFIG_PM
406static int s3c24xx_i2s_suspend(struct snd_soc_dai *cpu_dai)
407{
408 pr_debug("Entered %s\n", __func__);
409
410 s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
411 s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
412 s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
413 s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
414
415 clk_disable(s3c24xx_i2s.iis_clk);
416
417 return 0;
418}
419
420static int s3c24xx_i2s_resume(struct snd_soc_dai *cpu_dai)
421{
422 pr_debug("Entered %s\n", __func__);
423 clk_enable(s3c24xx_i2s.iis_clk);
424
425 writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
426 writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
427 writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
428 writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
429
430 return 0;
431}
432#else
433#define s3c24xx_i2s_suspend NULL
434#define s3c24xx_i2s_resume NULL
435#endif
436
437
438#define S3C24XX_I2S_RATES \
439 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
440 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
441 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
442
443static const struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
444 .trigger = s3c24xx_i2s_trigger,
445 .hw_params = s3c24xx_i2s_hw_params,
446 .set_fmt = s3c24xx_i2s_set_fmt,
447 .set_clkdiv = s3c24xx_i2s_set_clkdiv,
448 .set_sysclk = s3c24xx_i2s_set_sysclk,
449};
450
451static struct snd_soc_dai_driver s3c24xx_i2s_dai = {
452 .probe = s3c24xx_i2s_probe,
453 .suspend = s3c24xx_i2s_suspend,
454 .resume = s3c24xx_i2s_resume,
455 .playback = {
456 .channels_min = 2,
457 .channels_max = 2,
458 .rates = S3C24XX_I2S_RATES,
459 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
460 .capture = {
461 .channels_min = 2,
462 .channels_max = 2,
463 .rates = S3C24XX_I2S_RATES,
464 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
465 .ops = &s3c24xx_i2s_dai_ops,
466};
467
468static const struct snd_soc_component_driver s3c24xx_i2s_component = {
469 .name = "s3c24xx-i2s",
470};
471
472static int s3c24xx_iis_dev_probe(struct platform_device *pdev)
473{
474 int ret = 0;
475
476 ret = snd_soc_register_component(&pdev->dev, &s3c24xx_i2s_component,
477 &s3c24xx_i2s_dai, 1);
478 if (ret) {
479 pr_err("failed to register the dai\n");
480 return ret;
481 }
482
483 ret = asoc_dma_platform_register(&pdev->dev);
484 if (ret) {
485 pr_err("failed to register the dma: %d\n", ret);
486 goto err;
487 }
488
489 return 0;
490err:
491 snd_soc_unregister_component(&pdev->dev);
492 return ret;
493}
494
495static int s3c24xx_iis_dev_remove(struct platform_device *pdev)
496{
497 asoc_dma_platform_unregister(&pdev->dev);
498 snd_soc_unregister_component(&pdev->dev);
499 return 0;
500}
501
502static struct platform_driver s3c24xx_iis_driver = {
503 .probe = s3c24xx_iis_dev_probe,
504 .remove = s3c24xx_iis_dev_remove,
505 .driver = {
506 .name = "s3c24xx-iis",
507 .owner = THIS_MODULE,
508 },
509};
510
511module_platform_driver(s3c24xx_iis_driver);
512
513/* Module information */
514MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
515MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
516MODULE_LICENSE("GPL");
517MODULE_ALIAS("platform:s3c24xx-iis");