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>
29 #include <sound/core.h>
30 #include <sound/pcm.h>
31 #include <sound/pcm_params.h>
32 #include <sound/initval.h>
33 #include <sound/soc.h>
35 #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 "s3c24xx-i2s: " 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", __func__);
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", __func__);
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", __func__);
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", __func__);
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", __func__);
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:
227 iismod &= ~S3C2410_IISMOD_SLAVE;
233 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
234 case SND_SOC_DAIFMT_LEFT_J:
235 iismod |= S3C2410_IISMOD_MSB;
237 case SND_SOC_DAIFMT_I2S:
238 iismod &= ~S3C2410_IISMOD_MSB;
244 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
245 DBG("hw_params w: IISMOD: %lx \n", iismod);
249 static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
250 struct snd_pcm_hw_params *params)
252 struct snd_soc_pcm_runtime *rtd = substream->private_data;
255 DBG("Entered %s\n", __func__);
257 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
258 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_out;
260 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_in;
262 /* Working copies of register */
263 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
264 DBG("hw_params r: IISMOD: %lx\n", iismod);
266 switch (params_format(params)) {
267 case SNDRV_PCM_FORMAT_S8:
269 case SNDRV_PCM_FORMAT_S16_LE:
270 iismod |= S3C2410_IISMOD_16BIT;
274 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
275 DBG("hw_params w: IISMOD: %lx\n", iismod);
279 static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
283 DBG("Entered %s\n", __func__);
286 case SNDRV_PCM_TRIGGER_START:
287 case SNDRV_PCM_TRIGGER_RESUME:
288 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
289 if (!s3c24xx_snd_is_clkmaster()) {
290 ret = s3c24xx_snd_lrsync();
295 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
296 s3c24xx_snd_rxctrl(1);
298 s3c24xx_snd_txctrl(1);
300 case SNDRV_PCM_TRIGGER_STOP:
301 case SNDRV_PCM_TRIGGER_SUSPEND:
302 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
303 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
304 s3c24xx_snd_rxctrl(0);
306 s3c24xx_snd_txctrl(0);
318 * Set S3C24xx Clock source
320 static int s3c24xx_i2s_set_sysclk(struct snd_soc_cpu_dai *cpu_dai,
321 int clk_id, unsigned int freq, int dir)
323 u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
325 DBG("Entered %s\n", __func__);
327 iismod &= ~S3C2440_IISMOD_MPLL;
330 case S3C24XX_CLKSRC_PCLK:
332 case S3C24XX_CLKSRC_MPLL:
333 iismod |= S3C2440_IISMOD_MPLL;
339 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
344 * Set S3C24xx Clock dividers
346 static int s3c24xx_i2s_set_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
351 DBG("Entered %s\n", __func__);
354 case S3C24XX_DIV_BCLK:
355 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
356 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
358 case S3C24XX_DIV_MCLK:
359 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
360 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
362 case S3C24XX_DIV_PRESCALER:
363 writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
364 reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
365 writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
375 * To avoid duplicating clock code, allow machine driver to
376 * get the clockrate from here.
378 u32 s3c24xx_i2s_get_clockrate(void)
380 return clk_get_rate(s3c24xx_i2s.iis_clk);
382 EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
384 static int s3c24xx_i2s_probe(struct platform_device *pdev)
386 DBG("Entered %s\n", __func__);
388 s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
389 if (s3c24xx_i2s.regs == NULL)
392 s3c24xx_i2s.iis_clk = clk_get(&pdev->dev, "iis");
393 if (s3c24xx_i2s.iis_clk == NULL) {
394 DBG("failed to get iis_clock\n");
395 iounmap(s3c24xx_i2s.regs);
398 clk_enable(s3c24xx_i2s.iis_clk);
400 /* Configure the I2S pins in correct mode */
401 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
402 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
403 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
404 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
405 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
407 writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
409 s3c24xx_snd_txctrl(0);
410 s3c24xx_snd_rxctrl(0);
416 static int s3c24xx_i2s_suspend(struct platform_device *pdev,
417 struct snd_soc_cpu_dai *cpu_dai)
419 DBG("Entered %s\n", __func__);
421 s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
422 s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
423 s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
424 s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
426 clk_disable(s3c24xx_i2s.iis_clk);
431 static int s3c24xx_i2s_resume(struct platform_device *pdev,
432 struct snd_soc_cpu_dai *cpu_dai)
434 DBG("Entered %s\n", __func__);
435 clk_enable(s3c24xx_i2s.iis_clk);
437 writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
438 writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
439 writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
440 writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
445 #define s3c24xx_i2s_suspend NULL
446 #define s3c24xx_i2s_resume NULL
450 #define S3C24XX_I2S_RATES \
451 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
452 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
453 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
455 struct snd_soc_cpu_dai s3c24xx_i2s_dai = {
456 .name = "s3c24xx-i2s",
458 .type = SND_SOC_DAI_I2S,
459 .probe = s3c24xx_i2s_probe,
460 .suspend = s3c24xx_i2s_suspend,
461 .resume = s3c24xx_i2s_resume,
465 .rates = S3C24XX_I2S_RATES,
466 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
470 .rates = S3C24XX_I2S_RATES,
471 .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
473 .trigger = s3c24xx_i2s_trigger,
474 .hw_params = s3c24xx_i2s_hw_params,},
476 .set_fmt = s3c24xx_i2s_set_fmt,
477 .set_clkdiv = s3c24xx_i2s_set_clkdiv,
478 .set_sysclk = s3c24xx_i2s_set_sysclk,
481 EXPORT_SYMBOL_GPL(s3c24xx_i2s_dai);
483 /* Module information */
484 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
485 MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
486 MODULE_LICENSE("GPL");