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 * (c) 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 * Revision history
18 * 11th Dec 2006 Merged with Simtec driver
19 * 10th Nov 2006 Initial version.
20 */
21
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/device.h>
25 #include <linux/delay.h>
26 #include <linux/clk.h>
27 #include <linux/jiffies.h>
28 #include <sound/core.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/initval.h>
32 #include <sound/soc.h>
33
34 #include <asm/hardware.h>
35 #include <asm/io.h>
36 #include <asm/arch/regs-gpio.h>
37 #include <asm/arch/regs-clock.h>
38 #include <asm/arch/audio.h>
39 #include <asm/dma.h>
40 #include <asm/arch/dma.h>
41
42 #include <asm/plat-s3c24xx/regs-iis.h>
43
44 #include "s3c24xx-pcm.h"
45 #include "s3c24xx-i2s.h"
46
47 #define S3C24XX_I2S_DEBUG 0
48 #if S3C24XX_I2S_DEBUG
49 #define DBG(x...) printk(KERN_DEBUG x)
50 #else
51 #define DBG(x...)
52 #endif
53
54 static struct s3c2410_dma_client s3c24xx_dma_client_out = {
55 .name = "I2S PCM Stereo out"
56 };
57
58 static struct s3c2410_dma_client s3c24xx_dma_client_in = {
59 .name = "I2S PCM Stereo in"
60 };
61
62 static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_out = {
63 .client = &s3c24xx_dma_client_out,
64 .channel = DMACH_I2S_OUT,
65 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
66 .dma_size = 2,
67 };
68
69 static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_in = {
70 .client = &s3c24xx_dma_client_in,
71 .channel = DMACH_I2S_IN,
72 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
73 .dma_size = 2,
74 };
75
76 struct s3c24xx_i2s_info {
77 void __iomem *regs;
78 struct clk *iis_clk;
79 u32 iiscon;
80 u32 iismod;
81 u32 iisfcon;
82 u32 iispsr;
83 };
84 static struct s3c24xx_i2s_info s3c24xx_i2s;
85
86 static void s3c24xx_snd_txctrl(int on)
87 {
88 u32 iisfcon;
89 u32 iiscon;
90 u32 iismod;
91
92 DBG("Entered %s\n", __FUNCTION__);
93
94 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
95 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
96 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
97
98 DBG("r: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
99
100 if (on) {
101 iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
102 iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
103 iiscon &= ~S3C2410_IISCON_TXIDLE;
104 iismod |= S3C2410_IISMOD_TXMODE;
105
106 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
107 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
108 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
109 } else {
110 /* note, we have to disable the FIFOs otherwise bad things
111 * seem to happen when the DMA stops. According to the
112 * Samsung supplied kernel, this should allow the DMA
113 * engine and FIFOs to reset. If this isn't allowed, the
114 * DMA engine will simply freeze randomly.
115 */
116
117 iisfcon &= ~S3C2410_IISFCON_TXENABLE;
118 iisfcon &= ~S3C2410_IISFCON_TXDMA;
119 iiscon |= S3C2410_IISCON_TXIDLE;
120 iiscon &= ~S3C2410_IISCON_TXDMAEN;
121 iismod &= ~S3C2410_IISMOD_TXMODE;
122
123 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
124 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
125 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
126 }
127
128 DBG("w: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
129 }
130
131 static void s3c24xx_snd_rxctrl(int on)
132 {
133 u32 iisfcon;
134 u32 iiscon;
135 u32 iismod;
136
137 DBG("Entered %s\n", __FUNCTION__);
138
139 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
140 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
141 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
142
143 DBG("r: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
144
145 if (on) {
146 iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
147 iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
148 iiscon &= ~S3C2410_IISCON_RXIDLE;
149 iismod |= S3C2410_IISMOD_RXMODE;
150
151 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
152 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
153 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
154 } else {
155 /* note, we have to disable the FIFOs otherwise bad things
156 * seem to happen when the DMA stops. According to the
157 * Samsung supplied kernel, this should allow the DMA
158 * engine and FIFOs to reset. If this isn't allowed, the
159 * DMA engine will simply freeze randomly.
160 */
161
162 iisfcon &= ~S3C2410_IISFCON_RXENABLE;
163 iisfcon &= ~S3C2410_IISFCON_RXDMA;
164 iiscon |= S3C2410_IISCON_RXIDLE;
165 iiscon &= ~S3C2410_IISCON_RXDMAEN;
166 iismod &= ~S3C2410_IISMOD_RXMODE;
167
168 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
169 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
170 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
171 }
172
173 DBG("w: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
174 }
175
176 /*
177 * Wait for the LR signal to allow synchronisation to the L/R clock
178 * from the codec. May only be needed for slave mode.
179 */
180 static int s3c24xx_snd_lrsync(void)
181 {
182 u32 iiscon;
183 unsigned long timeout = jiffies + msecs_to_jiffies(5);
184
185 DBG("Entered %s\n", __FUNCTION__);
186
187 while (1) {
188 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
189 if (iiscon & S3C2410_IISCON_LRINDEX)
190 break;
191
192 if (time_after(jiffies, timeout))
193 return -ETIMEDOUT;
194 }
195
196 return 0;
197 }
198
199 /*
200 * Check whether CPU is the master or slave
201 */
202 static inline int s3c24xx_snd_is_clkmaster(void)
203 {
204 DBG("Entered %s\n", __FUNCTION__);
205
206 return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
207 }
208
209 /*
210 * Set S3C24xx I2S DAI format
211 */
212 static int s3c24xx_i2s_set_fmt(struct snd_soc_cpu_dai *cpu_dai,
213 unsigned int fmt)
214 {
215 u32 iismod;
216
217 DBG("Entered %s\n", __FUNCTION__);
218
219 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
220 DBG("hw_params r: IISMOD: %lx \n", iismod);
221
222 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
223 case SND_SOC_DAIFMT_CBM_CFM:
224 iismod |= S3C2410_IISMOD_SLAVE;
225 break;
226 case SND_SOC_DAIFMT_CBS_CFS:
227 break;
228 default:
229 return -EINVAL;
230 }
231
232 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
233 case SND_SOC_DAIFMT_LEFT_J:
234 iismod |= S3C2410_IISMOD_MSB;
235 break;
236 case SND_SOC_DAIFMT_I2S:
237 break;
238 default:
239 return -EINVAL;
240 }
241
242 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
243 DBG("hw_params w: IISMOD: %lx \n", iismod);
244 return 0;
245 }
246
247 static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
248 struct snd_pcm_hw_params *params)
249 {
250 struct snd_soc_pcm_runtime *rtd = substream->private_data;
251 u32 iismod;
252
253 DBG("Entered %s\n", __FUNCTION__);
254
255 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
256 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_out;
257 else
258 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_in;
259
260 /* Working copies of register */
261 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
262 DBG("hw_params r: IISMOD: %lx\n", iismod);
263
264 switch (params_format(params)) {
265 case SNDRV_PCM_FORMAT_S8:
266 break;
267 case SNDRV_PCM_FORMAT_S16_LE:
268 iismod |= S3C2410_IISMOD_16BIT;
269 break;
270 }
271
272 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
273 DBG("hw_params w: IISMOD: %lx\n", iismod);
274 return 0;
275 }
276
277 static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
278 {
279 int ret = 0;
280
281 DBG("Entered %s\n", __FUNCTION__);
282
283 switch (cmd) {
284 case SNDRV_PCM_TRIGGER_START:
285 case SNDRV_PCM_TRIGGER_RESUME:
286 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
287 if (!s3c24xx_snd_is_clkmaster()) {
288 ret = s3c24xx_snd_lrsync();
289 if (ret)
290 goto exit_err;
291 }
292
293 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
294 s3c24xx_snd_rxctrl(1);
295 else
296 s3c24xx_snd_txctrl(1);
297 break;
298 case SNDRV_PCM_TRIGGER_STOP:
299 case SNDRV_PCM_TRIGGER_SUSPEND:
300 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
301 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
302 s3c24xx_snd_rxctrl(0);
303 else
304 s3c24xx_snd_txctrl(0);
305 break;
306 default:
307 ret = -EINVAL;
308 break;
309 }
310
311 exit_err:
312 return ret;
313 }
314
315 /*
316 * Set S3C24xx Clock source
317 */
318 static int s3c24xx_i2s_set_sysclk(struct snd_soc_cpu_dai *cpu_dai,
319 int clk_id, unsigned int freq, int dir)
320 {
321 u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
322
323 DBG("Entered %s\n", __FUNCTION__);
324
325 iismod &= ~S3C2440_IISMOD_MPLL;
326
327 switch (clk_id) {
328 case S3C24XX_CLKSRC_PCLK:
329 break;
330 case S3C24XX_CLKSRC_MPLL:
331 iismod |= S3C2440_IISMOD_MPLL;
332 break;
333 default:
334 return -EINVAL;
335 }
336
337 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
338 return 0;
339 }
340
341 /*
342 * Set S3C24xx Clock dividers
343 */
344 static int s3c24xx_i2s_set_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
345 int div_id, int div)
346 {
347 u32 reg;
348
349 DBG("Entered %s\n", __FUNCTION__);
350
351 switch (div_id) {
352 case S3C24XX_DIV_BCLK:
353 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
354 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
355 break;
356 case S3C24XX_DIV_MCLK:
357 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
358 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
359 break;
360 case S3C24XX_DIV_PRESCALER:
361 writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
362 reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
363 writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
364 break;
365 default:
366 return -EINVAL;
367 }
368
369 return 0;
370 }
371
372 /*
373 * To avoid duplicating clock code, allow machine driver to
374 * get the clockrate from here.
375 */
376 u32 s3c24xx_i2s_get_clockrate(void)
377 {
378 return clk_get_rate(s3c24xx_i2s.iis_clk);
379 }
380 EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
381
382 static int s3c24xx_i2s_probe(struct platform_device *pdev)
383 {
384 DBG("Entered %s\n", __FUNCTION__);
385
386 s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
387 if (s3c24xx_i2s.regs == NULL)
388 return -ENXIO;
389
390 s3c24xx_i2s.iis_clk=clk_get(&pdev->dev, "iis");
391 if (s3c24xx_i2s.iis_clk == NULL) {
392 DBG("failed to get iis_clock\n");
393 iounmap(s3c24xx_i2s.regs);
394 return -ENODEV;
395 }
396 clk_enable(s3c24xx_i2s.iis_clk);
397
398 /* Configure the I2S pins in correct mode */
399 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
400 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
401 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
402 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
403 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
404
405 writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
406
407 s3c24xx_snd_txctrl(0);
408 s3c24xx_snd_rxctrl(0);
409
410 return 0;
411 }
412
413 #ifdef CONFIG_PM
414 int s3c24xx_i2s_suspend(struct platform_device *pdev,
415 struct snd_soc_cpu_dai *cpu_dai)
416 {
417 s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
418 s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
419 s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
420 s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
421
422 clk_disable(s3c24xx_i2s.iis_clk);
423
424 return 0;
425 }
426
427 int s3c24xx_i2s_resume(struct platform_device *pdev,
428 struct snd_soc_cpu_dai *cpu_dai)
429 {
430 clk_enable(s3c24xx_i2s.iis_clk);
431
432 writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
433 writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
434 writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
435 writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
436
437 return 0;
438 }
439 #else
440 #define s3c24xx_i2s_suspend NULL
441 #define s3c24xx_i2s_resume NULL
442 #endif
443
444
445 #define S3C24XX_I2S_RATES \
446 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
447 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
448 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
449
450 struct snd_soc_cpu_dai s3c24xx_i2s_dai = {
451 .name = "s3c24xx-i2s",
452 .id = 0,
453 .type = SND_SOC_DAI_I2S,
454 .probe = s3c24xx_i2s_probe,
455 .suspend = s3c24xx_i2s_suspend,
456 .resume = s3c24xx_i2s_resume,
457 .playback = {
458 .channels_min = 2,
459 .channels_max = 2,
460 .rates = S3C24XX_I2S_RATES,
461 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
462 .capture = {
463 .channels_min = 2,
464 .channels_max = 2,
465 .rates = S3C24XX_I2S_RATES,
466 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
467 .ops = {
468 .trigger = s3c24xx_i2s_trigger,
469 .hw_params = s3c24xx_i2s_hw_params,},
470 .dai_ops = {
471 .set_fmt = s3c24xx_i2s_set_fmt,
472 .set_clkdiv = s3c24xx_i2s_set_clkdiv,
473 .set_sysclk = s3c24xx_i2s_set_sysclk,
474 },
475 };
476 EXPORT_SYMBOL_GPL(s3c24xx_i2s_dai);
477
478 /* Module information */
479 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
480 MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
481 MODULE_LICENSE("GPL");
482
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