2 * s3c24xx-i2s.c -- ALSA Soc Audio Layer
4 * (c) 2006 Wolfson Microelectronics PLC.
5 * Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
7 * (c) 2004-2005 Simtec Electronics
8 * http://armlinux.simtec.co.uk/
9 * Ben Dooks <ben@simtec.co.uk>
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.
18 * 11th Dec 2006 Merged with Simtec driver
19 * 10th Nov 2006 Initial version.
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>
34 #include <asm/hardware.h>
36 #include <asm/arch/regs-gpio.h>
37 #include <asm/arch/regs-clock.h>
38 #include <asm/arch/audio.h>
40 #include <asm/arch/dma.h>
42 #include <asm/plat-s3c24xx/regs-iis.h>
44 #include "s3c24xx-pcm.h"
45 #include "s3c24xx-i2s.h"
47 #define S3C24XX_I2S_DEBUG 0
49 #define DBG(x...) printk(KERN_DEBUG x)
54 static struct s3c2410_dma_client s3c24xx_dma_client_out = {
55 .name = "I2S PCM Stereo out"
58 static struct s3c2410_dma_client s3c24xx_dma_client_in = {
59 .name = "I2S PCM Stereo in"
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,
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,
76 struct s3c24xx_i2s_info {
84 static struct s3c24xx_i2s_info s3c24xx_i2s;
86 static void s3c24xx_snd_txctrl(int on)
92 DBG("Entered %s\n", __FUNCTION__);
94 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
95 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
96 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
98 DBG("r: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
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;
106 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
107 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
108 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
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.
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;
123 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
124 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
125 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
128 DBG("w: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
131 static void s3c24xx_snd_rxctrl(int on)
137 DBG("Entered %s\n", __FUNCTION__);
139 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
140 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
141 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
143 DBG("r: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
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;
151 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
152 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
153 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
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.
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;
168 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
169 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
170 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
173 DBG("w: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
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.
180 static int s3c24xx_snd_lrsync(void)
183 unsigned long timeout = jiffies + msecs_to_jiffies(5);
185 DBG("Entered %s\n", __FUNCTION__);
188 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
189 if (iiscon & S3C2410_IISCON_LRINDEX)
192 if (time_after(jiffies, timeout))
200 * Check whether CPU is the master or slave
202 static inline int s3c24xx_snd_is_clkmaster(void)
204 DBG("Entered %s\n", __FUNCTION__);
206 return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
210 * Set S3C24xx I2S DAI format
212 static int s3c24xx_i2s_set_fmt(struct snd_soc_cpu_dai *cpu_dai,
217 DBG("Entered %s\n", __FUNCTION__);
219 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
220 DBG("hw_params r: IISMOD: %lx \n", iismod);
222 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
223 case SND_SOC_DAIFMT_CBM_CFM:
224 iismod |= S3C2410_IISMOD_SLAVE;
226 case SND_SOC_DAIFMT_CBS_CFS:
232 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
233 case SND_SOC_DAIFMT_LEFT_J:
234 iismod |= S3C2410_IISMOD_MSB;
236 case SND_SOC_DAIFMT_I2S:
242 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
243 DBG("hw_params w: IISMOD: %lx \n", iismod);
247 static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
248 struct snd_pcm_hw_params *params)
250 struct snd_soc_pcm_runtime *rtd = substream->private_data;
253 DBG("Entered %s\n", __FUNCTION__);
255 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
256 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_out;
258 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_in;
260 /* Working copies of register */
261 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
262 DBG("hw_params r: IISMOD: %lx\n", iismod);
264 switch (params_format(params)) {
265 case SNDRV_PCM_FORMAT_S8:
267 case SNDRV_PCM_FORMAT_S16_LE:
268 iismod |= S3C2410_IISMOD_16BIT;
272 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
273 DBG("hw_params w: IISMOD: %lx\n", iismod);
277 static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
281 DBG("Entered %s\n", __FUNCTION__);
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();
293 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
294 s3c24xx_snd_rxctrl(1);
296 s3c24xx_snd_txctrl(1);
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);
304 s3c24xx_snd_txctrl(0);
316 * Set S3C24xx Clock source
318 static int s3c24xx_i2s_set_sysclk(struct snd_soc_cpu_dai *cpu_dai,
319 int clk_id, unsigned int freq, int dir)
321 u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
323 DBG("Entered %s\n", __FUNCTION__);
325 iismod &= ~S3C2440_IISMOD_MPLL;
328 case S3C24XX_CLKSRC_PCLK:
330 case S3C24XX_CLKSRC_MPLL:
331 iismod |= S3C2440_IISMOD_MPLL;
337 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
342 * Set S3C24xx Clock dividers
344 static int s3c24xx_i2s_set_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
349 DBG("Entered %s\n", __FUNCTION__);
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);
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);
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);
373 * To avoid duplicating clock code, allow machine driver to
374 * get the clockrate from here.
376 u32 s3c24xx_i2s_get_clockrate(void)
378 return clk_get_rate(s3c24xx_i2s.iis_clk);
380 EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
382 static int s3c24xx_i2s_probe(struct platform_device *pdev)
384 DBG("Entered %s\n", __FUNCTION__);
386 s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
387 if (s3c24xx_i2s.regs == NULL)
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);
396 clk_enable(s3c24xx_i2s.iis_clk);
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);
405 writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
407 s3c24xx_snd_txctrl(0);
408 s3c24xx_snd_rxctrl(0);
414 int s3c24xx_i2s_suspend(struct platform_device *pdev,
415 struct snd_soc_cpu_dai *cpu_dai)
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);
422 clk_disable(s3c24xx_i2s.iis_clk);
427 int s3c24xx_i2s_resume(struct platform_device *pdev,
428 struct snd_soc_cpu_dai *cpu_dai)
430 clk_enable(s3c24xx_i2s.iis_clk);
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);
440 #define s3c24xx_i2s_suspend NULL
441 #define s3c24xx_i2s_resume NULL
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)
450 struct snd_soc_cpu_dai s3c24xx_i2s_dai = {
451 .name = "s3c24xx-i2s",
453 .type = SND_SOC_DAI_I2S,
454 .probe = s3c24xx_i2s_probe,
455 .suspend = s3c24xx_i2s_suspend,
456 .resume = s3c24xx_i2s_resume,
460 .rates = S3C24XX_I2S_RATES,
461 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
465 .rates = S3C24XX_I2S_RATES,
466 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
468 .trigger = s3c24xx_i2s_trigger,
469 .hw_params = s3c24xx_i2s_hw_params,},
471 .set_fmt = s3c24xx_i2s_set_fmt,
472 .set_clkdiv = s3c24xx_i2s_set_clkdiv,
473 .set_sysclk = s3c24xx_i2s_set_sysclk,
476 EXPORT_SYMBOL_GPL(s3c24xx_i2s_dai);
478 /* Module information */
479 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
480 MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
481 MODULE_LICENSE("GPL");