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.
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/device.h>
20 #include <linux/delay.h>
21 #include <linux/clk.h>
22 #include <linux/jiffies.h>
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include <sound/initval.h>
28 #include <sound/soc.h>
30 #include <asm/hardware.h>
31 #include <asm/arch/regs-gpio.h>
32 #include <asm/arch/regs-clock.h>
33 #include <asm/arch/audio.h>
35 #include <asm/arch/dma.h>
37 #include <asm/plat-s3c24xx/regs-iis.h>
39 #include "s3c24xx-pcm.h"
40 #include "s3c24xx-i2s.h"
42 #define S3C24XX_I2S_DEBUG 0
44 #define DBG(x...) printk(KERN_DEBUG "s3c24xx-i2s: " x)
49 static struct s3c2410_dma_client s3c24xx_dma_client_out = {
50 .name = "I2S PCM Stereo out"
53 static struct s3c2410_dma_client s3c24xx_dma_client_in = {
54 .name = "I2S PCM Stereo in"
57 static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_out = {
58 .client = &s3c24xx_dma_client_out,
59 .channel = DMACH_I2S_OUT,
60 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
64 static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_in = {
65 .client = &s3c24xx_dma_client_in,
66 .channel = DMACH_I2S_IN,
67 .dma_addr = S3C2410_PA_IIS + S3C2410_IISFIFO,
71 struct s3c24xx_i2s_info {
79 static struct s3c24xx_i2s_info s3c24xx_i2s;
81 static void s3c24xx_snd_txctrl(int on)
87 DBG("Entered %s\n", __func__);
89 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
90 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
91 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
93 DBG("r: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
96 iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
97 iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
98 iiscon &= ~S3C2410_IISCON_TXIDLE;
99 iismod |= S3C2410_IISMOD_TXMODE;
101 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
102 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
103 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
105 /* note, we have to disable the FIFOs otherwise bad things
106 * seem to happen when the DMA stops. According to the
107 * Samsung supplied kernel, this should allow the DMA
108 * engine and FIFOs to reset. If this isn't allowed, the
109 * DMA engine will simply freeze randomly.
112 iisfcon &= ~S3C2410_IISFCON_TXENABLE;
113 iisfcon &= ~S3C2410_IISFCON_TXDMA;
114 iiscon |= S3C2410_IISCON_TXIDLE;
115 iiscon &= ~S3C2410_IISCON_TXDMAEN;
116 iismod &= ~S3C2410_IISMOD_TXMODE;
118 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
119 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
120 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
123 DBG("w: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
126 static void s3c24xx_snd_rxctrl(int on)
132 DBG("Entered %s\n", __func__);
134 iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
135 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
136 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
138 DBG("r: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
141 iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
142 iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
143 iiscon &= ~S3C2410_IISCON_RXIDLE;
144 iismod |= S3C2410_IISMOD_RXMODE;
146 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
147 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
148 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
150 /* note, we have to disable the FIFOs otherwise bad things
151 * seem to happen when the DMA stops. According to the
152 * Samsung supplied kernel, this should allow the DMA
153 * engine and FIFOs to reset. If this isn't allowed, the
154 * DMA engine will simply freeze randomly.
157 iisfcon &= ~S3C2410_IISFCON_RXENABLE;
158 iisfcon &= ~S3C2410_IISFCON_RXDMA;
159 iiscon |= S3C2410_IISCON_RXIDLE;
160 iiscon &= ~S3C2410_IISCON_RXDMAEN;
161 iismod &= ~S3C2410_IISMOD_RXMODE;
163 writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
164 writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
165 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
168 DBG("w: IISCON: %lx IISMOD: %lx IISFCON: %lx\n", iiscon, iismod, iisfcon);
172 * Wait for the LR signal to allow synchronisation to the L/R clock
173 * from the codec. May only be needed for slave mode.
175 static int s3c24xx_snd_lrsync(void)
178 unsigned long timeout = jiffies + msecs_to_jiffies(5);
180 DBG("Entered %s\n", __func__);
183 iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
184 if (iiscon & S3C2410_IISCON_LRINDEX)
187 if (time_after(jiffies, timeout))
195 * Check whether CPU is the master or slave
197 static inline int s3c24xx_snd_is_clkmaster(void)
199 DBG("Entered %s\n", __func__);
201 return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
205 * Set S3C24xx I2S DAI format
207 static int s3c24xx_i2s_set_fmt(struct snd_soc_cpu_dai *cpu_dai,
212 DBG("Entered %s\n", __func__);
214 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
215 DBG("hw_params r: IISMOD: %lx \n", iismod);
217 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
218 case SND_SOC_DAIFMT_CBM_CFM:
219 iismod |= S3C2410_IISMOD_SLAVE;
221 case SND_SOC_DAIFMT_CBS_CFS:
222 iismod &= ~S3C2410_IISMOD_SLAVE;
228 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
229 case SND_SOC_DAIFMT_LEFT_J:
230 iismod |= S3C2410_IISMOD_MSB;
232 case SND_SOC_DAIFMT_I2S:
233 iismod &= ~S3C2410_IISMOD_MSB;
239 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
240 DBG("hw_params w: IISMOD: %lx \n", iismod);
244 static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
245 struct snd_pcm_hw_params *params)
247 struct snd_soc_pcm_runtime *rtd = substream->private_data;
250 DBG("Entered %s\n", __func__);
252 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
253 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_out;
255 rtd->dai->cpu_dai->dma_data = &s3c24xx_i2s_pcm_stereo_in;
257 /* Working copies of register */
258 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
259 DBG("hw_params r: IISMOD: %lx\n", iismod);
261 switch (params_format(params)) {
262 case SNDRV_PCM_FORMAT_S8:
264 case SNDRV_PCM_FORMAT_S16_LE:
265 iismod |= S3C2410_IISMOD_16BIT;
269 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
270 DBG("hw_params w: IISMOD: %lx\n", iismod);
274 static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd)
278 DBG("Entered %s\n", __func__);
281 case SNDRV_PCM_TRIGGER_START:
282 case SNDRV_PCM_TRIGGER_RESUME:
283 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
284 if (!s3c24xx_snd_is_clkmaster()) {
285 ret = s3c24xx_snd_lrsync();
290 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
291 s3c24xx_snd_rxctrl(1);
293 s3c24xx_snd_txctrl(1);
295 case SNDRV_PCM_TRIGGER_STOP:
296 case SNDRV_PCM_TRIGGER_SUSPEND:
297 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
298 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
299 s3c24xx_snd_rxctrl(0);
301 s3c24xx_snd_txctrl(0);
313 * Set S3C24xx Clock source
315 static int s3c24xx_i2s_set_sysclk(struct snd_soc_cpu_dai *cpu_dai,
316 int clk_id, unsigned int freq, int dir)
318 u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
320 DBG("Entered %s\n", __func__);
322 iismod &= ~S3C2440_IISMOD_MPLL;
325 case S3C24XX_CLKSRC_PCLK:
327 case S3C24XX_CLKSRC_MPLL:
328 iismod |= S3C2440_IISMOD_MPLL;
334 writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
339 * Set S3C24xx Clock dividers
341 static int s3c24xx_i2s_set_clkdiv(struct snd_soc_cpu_dai *cpu_dai,
346 DBG("Entered %s\n", __func__);
349 case S3C24XX_DIV_BCLK:
350 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
351 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
353 case S3C24XX_DIV_MCLK:
354 reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
355 writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
357 case S3C24XX_DIV_PRESCALER:
358 writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
359 reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
360 writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
370 * To avoid duplicating clock code, allow machine driver to
371 * get the clockrate from here.
373 u32 s3c24xx_i2s_get_clockrate(void)
375 return clk_get_rate(s3c24xx_i2s.iis_clk);
377 EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
379 static int s3c24xx_i2s_probe(struct platform_device *pdev)
381 DBG("Entered %s\n", __func__);
383 s3c24xx_i2s.regs = ioremap(S3C2410_PA_IIS, 0x100);
384 if (s3c24xx_i2s.regs == NULL)
387 s3c24xx_i2s.iis_clk = clk_get(&pdev->dev, "iis");
388 if (s3c24xx_i2s.iis_clk == NULL) {
389 DBG("failed to get iis_clock\n");
390 iounmap(s3c24xx_i2s.regs);
393 clk_enable(s3c24xx_i2s.iis_clk);
395 /* Configure the I2S pins in correct mode */
396 s3c2410_gpio_cfgpin(S3C2410_GPE0, S3C2410_GPE0_I2SLRCK);
397 s3c2410_gpio_cfgpin(S3C2410_GPE1, S3C2410_GPE1_I2SSCLK);
398 s3c2410_gpio_cfgpin(S3C2410_GPE2, S3C2410_GPE2_CDCLK);
399 s3c2410_gpio_cfgpin(S3C2410_GPE3, S3C2410_GPE3_I2SSDI);
400 s3c2410_gpio_cfgpin(S3C2410_GPE4, S3C2410_GPE4_I2SSDO);
402 writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
404 s3c24xx_snd_txctrl(0);
405 s3c24xx_snd_rxctrl(0);
411 static int s3c24xx_i2s_suspend(struct platform_device *pdev,
412 struct snd_soc_cpu_dai *cpu_dai)
414 DBG("Entered %s\n", __func__);
416 s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
417 s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
418 s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
419 s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
421 clk_disable(s3c24xx_i2s.iis_clk);
426 static int s3c24xx_i2s_resume(struct platform_device *pdev,
427 struct snd_soc_cpu_dai *cpu_dai)
429 DBG("Entered %s\n", __func__);
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");