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/regs-gpio.h>
27 #include <mach/dma.h>
28 #include <plat/regs-iis.h>
29
30 #include "dma.h"
31 #include "s3c24xx-i2s.h"
32
33 static struct s3c2410_dma_client s3c24xx_dma_client_out = {
34 .name = "I2S PCM Stereo out"
35 };
36
37 static struct s3c2410_dma_client s3c24xx_dma_client_in = {
38 .name = "I2S PCM Stereo in"
39 };
40
41 static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_out = {
42 .client = &s3c24xx_dma_client_out,
43 .channel = DMACH_I2S_OUT,
44 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
45 .dma_size = 2,
46 };
47
48 static struct s3c_dma_params s3c24xx_i2s_pcm_stereo_in = {
49 .client = &s3c24xx_dma_client_in,
50 .channel = DMACH_I2S_IN,
51 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
52 .dma_size = 2,
53 };
54
55 struct s3c24xx_i2s_info {
56 void __iomem *regs;
57 struct clk *iis_clk;
58 u32 iiscon;
59 u32 iismod;
60 u32 iisfcon;
61 u32 iispsr;
62 };
63 static struct s3c24xx_i2s_info s3c24xx_i2s;
64
s3c24xx_snd_txctrl(int on)65 static void s3c24xx_snd_txctrl(int on)
66 {
67 u32 iisfcon;
68 u32 iiscon;
69 u32 iismod;
70
71 pr_debug("Entered %s\n", __func__);
72
73 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
74 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
75 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
76
77 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
78
79 if (on) {
80 iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
81 iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
82 iiscon &= ~S3C2410_IISCON_TXIDLE;
83 iismod |= S3C2410_IISMOD_TXMODE;
84
85 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
86 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
87 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
88 } else {
89 /* note, we have to disable the FIFOs otherwise bad things
90 * seem to happen when the DMA stops. According to the
91 * Samsung supplied kernel, this should allow the DMA
92 * engine and FIFOs to reset. If this isn't allowed, the
93 * DMA engine will simply freeze randomly.
94 */
95
96 iisfcon &= ~S3C2410_IISFCON_TXENABLE;
97 iisfcon &= ~S3C2410_IISFCON_TXDMA;
98 iiscon |= S3C2410_IISCON_TXIDLE;
99 iiscon &= ~S3C2410_IISCON_TXDMAEN;
100 iismod &= ~S3C2410_IISMOD_TXMODE;
101
102 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
103 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
104 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
105 }
106
107 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
108 }
109
s3c24xx_snd_rxctrl(int on)110 static void s3c24xx_snd_rxctrl(int on)
111 {
112 u32 iisfcon;
113 u32 iiscon;
114 u32 iismod;
115
116 pr_debug("Entered %s\n", __func__);
117
118 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
119 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
120 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
121
122 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
123
124 if (on) {
125 iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
126 iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
127 iiscon &= ~S3C2410_IISCON_RXIDLE;
128 iismod |= S3C2410_IISMOD_RXMODE;
129
130 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
131 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
132 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
133 } else {
134 /* note, we have to disable the FIFOs otherwise bad things
135 * seem to happen when the DMA stops. According to the
136 * Samsung supplied kernel, this should allow the DMA
137 * engine and FIFOs to reset. If this isn't allowed, the
138 * DMA engine will simply freeze randomly.
139 */
140
141 iisfcon &= ~S3C2410_IISFCON_RXENABLE;
142 iisfcon &= ~S3C2410_IISFCON_RXDMA;
143 iiscon |= S3C2410_IISCON_RXIDLE;
144 iiscon &= ~S3C2410_IISCON_RXDMAEN;
145 iismod &= ~S3C2410_IISMOD_RXMODE;
146
147 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
148 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
149 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
150 }
151
152 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
153 }
154
155 /*
156 * Wait for the LR signal to allow synchronisation to the L/R clock
157 * from the codec. May only be needed for slave mode.
158 */
s3c24xx_snd_lrsync(void)159 static int s3c24xx_snd_lrsync(void)
160 {
161 u32 iiscon;
162 int timeout = 50; /* 5ms */
163
164 pr_debug("Entered %s\n", __func__);
165
166 while (1) {
167 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
168 if (iiscon & S3C2410_IISCON_LRINDEX)
169 break;
170
171 if (!timeout--)
172 return -ETIMEDOUT;
173 udelay(100);
174 }
175
176 return 0;
177 }
178
179 /*
180 * Check whether CPU is the master or slave
181 */
s3c24xx_snd_is_clkmaster(void)182 static inline int s3c24xx_snd_is_clkmaster(void)
183 {
184 pr_debug("Entered %s\n", __func__);
185
186 return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
187 }
188
189 /*
190 * Set S3C24xx I2S DAI format
191 */
s3c24xx_i2s_set_fmt(struct snd_soc_dai * cpu_dai,unsigned int fmt)192 static int s3c24xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
193 unsigned int fmt)
194 {
195 u32 iismod;
196
197 pr_debug("Entered %s\n", __func__);
198
199 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
200 pr_debug("hw_params r: IISMOD: %x \n", iismod);
201
202 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
203 case SND_SOC_DAIFMT_CBM_CFM:
204 iismod |= S3C2410_IISMOD_SLAVE;
205 break;
206 case SND_SOC_DAIFMT_CBS_CFS:
207 iismod &= ~S3C2410_IISMOD_SLAVE;
208 break;
209 default:
210 return -EINVAL;
211 }
212
213 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
214 case SND_SOC_DAIFMT_LEFT_J:
215 iismod |= S3C2410_IISMOD_MSB;
216 break;
217 case SND_SOC_DAIFMT_I2S:
218 iismod &= ~S3C2410_IISMOD_MSB;
219 break;
220 default:
221 return -EINVAL;
222 }
223
224 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
225 pr_debug("hw_params w: IISMOD: %x \n", iismod);
226 return 0;
227 }
228
s3c24xx_i2s_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)229 static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
230 struct snd_pcm_hw_params *params,
231 struct snd_soc_dai *dai)
232 {
233 struct snd_soc_pcm_runtime *rtd = substream->private_data;
234 struct s3c_dma_params *dma_data;
235 u32 iismod;
236
237 pr_debug("Entered %s\n", __func__);
238
239 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
240 dma_data = &s3c24xx_i2s_pcm_stereo_out;
241 else
242 dma_data = &s3c24xx_i2s_pcm_stereo_in;
243
244 snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
245
246 /* Working copies of register */
247 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
248 pr_debug("hw_params r: IISMOD: %x\n", iismod);
249
250 switch (params_format(params)) {
251 case SNDRV_PCM_FORMAT_S8:
252 iismod &= ~S3C2410_IISMOD_16BIT;
253 dma_data->dma_size = 1;
254 break;
255 case SNDRV_PCM_FORMAT_S16_LE:
256 iismod |= S3C2410_IISMOD_16BIT;
257 dma_data->dma_size = 2;
258 break;
259 default:
260 return -EINVAL;
261 }
262
263 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
264 pr_debug("hw_params w: IISMOD: %x\n", iismod);
265 return 0;
266 }
267
s3c24xx_i2s_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)268 static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
269 struct snd_soc_dai *dai)
270 {
271 int ret = 0;
272 struct s3c_dma_params *dma_data =
273 snd_soc_dai_get_dma_data(dai, substream);
274
275 pr_debug("Entered %s\n", __func__);
276
277 switch (cmd) {
278 case SNDRV_PCM_TRIGGER_START:
279 case SNDRV_PCM_TRIGGER_RESUME:
280 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
281 if (!s3c24xx_snd_is_clkmaster()) {
282 ret = s3c24xx_snd_lrsync();
283 if (ret)
284 goto exit_err;
285 }
286
287 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
288 s3c24xx_snd_rxctrl(1);
289 else
290 s3c24xx_snd_txctrl(1);
291
292 s3c2410_dma_ctrl(dma_data->channel, S3C2410_DMAOP_STARTED);
293 break;
294 case SNDRV_PCM_TRIGGER_STOP:
295 case SNDRV_PCM_TRIGGER_SUSPEND:
296 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
297 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
298 s3c24xx_snd_rxctrl(0);
299 else
300 s3c24xx_snd_txctrl(0);
301 break;
302 default:
303 ret = -EINVAL;
304 break;
305 }
306
307 exit_err:
308 return ret;
309 }
310
311 /*
312 * Set S3C24xx Clock source
313 */
s3c24xx_i2s_set_sysclk(struct snd_soc_dai * cpu_dai,int clk_id,unsigned int freq,int dir)314 static int s3c24xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
315 int clk_id, unsigned int freq, int dir)
316 {
317 u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
318
319 pr_debug("Entered %s\n", __func__);
320
321 iismod &= ~S3C2440_IISMOD_MPLL;
322
323 switch (clk_id) {
324 case S3C24XX_CLKSRC_PCLK:
325 break;
326 case S3C24XX_CLKSRC_MPLL:
327 iismod |= S3C2440_IISMOD_MPLL;
328 break;
329 default:
330 return -EINVAL;
331 }
332
333 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
334 return 0;
335 }
336
337 /*
338 * Set S3C24xx Clock dividers
339 */
s3c24xx_i2s_set_clkdiv(struct snd_soc_dai * cpu_dai,int div_id,int div)340 static int s3c24xx_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
341 int div_id, int div)
342 {
343 u32 reg;
344
345 pr_debug("Entered %s\n", __func__);
346
347 switch (div_id) {
348 case S3C24XX_DIV_BCLK:
349 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
350 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
351 break;
352 case S3C24XX_DIV_MCLK:
353 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
354 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
355 break;
356 case S3C24XX_DIV_PRESCALER:
357 writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
358 reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
359 writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
360 break;
361 default:
362 return -EINVAL;
363 }
364
365 return 0;
366 }
367
368 /*
369 * To avoid duplicating clock code, allow machine driver to
370 * get the clockrate from here.
371 */
s3c24xx_i2s_get_clockrate(void)372 u32 s3c24xx_i2s_get_clockrate(void)
373 {
374 return clk_get_rate(s3c24xx_i2s.iis_clk);
375 }
376 EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
377
s3c24xx_i2s_probe(struct snd_soc_dai * dai)378 static int s3c24xx_i2s_probe(struct snd_soc_dai *dai)
379 {
380 pr_debug("Entered %s\n", __func__);
381
382 s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
383 if (s3c24xx_i2s.regs == NULL)
384 return -ENXIO;
385
386 s3c24xx_i2s.iis_clk = clk_get(dai->dev, "iis");
387 if (IS_ERR(s3c24xx_i2s.iis_clk)) {
388 pr_err("failed to get iis_clock\n");
389 iounmap(s3c24xx_i2s.regs);
390 return PTR_ERR(s3c24xx_i2s.iis_clk);
391 }
392 clk_enable(s3c24xx_i2s.iis_clk);
393
394 /* Configure the I2S pins in correct mode */
395 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
396 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
397 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
398 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
399 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
400
401 writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
402
403 s3c24xx_snd_txctrl(0);
404 s3c24xx_snd_rxctrl(0);
405
406 return 0;
407 }
408
409 #ifdef CONFIG_PM
s3c24xx_i2s_suspend(struct snd_soc_dai * cpu_dai)410 static int s3c24xx_i2s_suspend(struct snd_soc_dai *cpu_dai)
411 {
412 pr_debug("Entered %s\n", __func__);
413
414 s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
415 s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
416 s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
417 s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
418
419 clk_disable(s3c24xx_i2s.iis_clk);
420
421 return 0;
422 }
423
s3c24xx_i2s_resume(struct snd_soc_dai * cpu_dai)424 static int s3c24xx_i2s_resume(struct snd_soc_dai *cpu_dai)
425 {
426 pr_debug("Entered %s\n", __func__);
427 clk_enable(s3c24xx_i2s.iis_clk);
428
429 writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
430 writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
431 writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
432 writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
433
434 return 0;
435 }
436 #else
437 #define s3c24xx_i2s_suspend NULL
438 #define s3c24xx_i2s_resume NULL
439 #endif
440
441
442 #define S3C24XX_I2S_RATES \
443 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
444 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
445 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
446
447 static const struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
448 .trigger = s3c24xx_i2s_trigger,
449 .hw_params = s3c24xx_i2s_hw_params,
450 .set_fmt = s3c24xx_i2s_set_fmt,
451 .set_clkdiv = s3c24xx_i2s_set_clkdiv,
452 .set_sysclk = s3c24xx_i2s_set_sysclk,
453 };
454
455 static struct snd_soc_dai_driver s3c24xx_i2s_dai = {
456 .probe = s3c24xx_i2s_probe,
457 .suspend = s3c24xx_i2s_suspend,
458 .resume = s3c24xx_i2s_resume,
459 .playback = {
460 .channels_min = 2,
461 .channels_max = 2,
462 .rates = S3C24XX_I2S_RATES,
463 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
464 .capture = {
465 .channels_min = 2,
466 .channels_max = 2,
467 .rates = S3C24XX_I2S_RATES,
468 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
469 .ops = &s3c24xx_i2s_dai_ops,
470 };
471
s3c24xx_iis_dev_probe(struct platform_device * pdev)472 static __devinit int s3c24xx_iis_dev_probe(struct platform_device *pdev)
473 {
474 return snd_soc_register_dai(&pdev->dev, &s3c24xx_i2s_dai);
475 }
476
s3c24xx_iis_dev_remove(struct platform_device * pdev)477 static __devexit int s3c24xx_iis_dev_remove(struct platform_device *pdev)
478 {
479 snd_soc_unregister_dai(&pdev->dev);
480 return 0;
481 }
482
483 static struct platform_driver s3c24xx_iis_driver = {
484 .probe = s3c24xx_iis_dev_probe,
485 .remove = __devexit_p(s3c24xx_iis_dev_remove),
486 .driver = {
487 .name = "s3c24xx-iis",
488 .owner = THIS_MODULE,
489 },
490 };
491
492 module_platform_driver(s3c24xx_iis_driver);
493
494 /* Module information */
495 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
496 MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
497 MODULE_LICENSE("GPL");
498 MODULE_ALIAS("platform:s3c24xx-iis");
499