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 * Copyright 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 <mach/hardware.h>
31 #include <mach/regs-gpio.h>
32 #include <mach/regs-clock.h>
33 #include <plat/audio.h>
37 #include <plat/regs-iis.h>
39 #include "s3c24xx-pcm.h"
40 #include "s3c24xx-i2s.h"
42 static struct s3c2410_dma_client s3c24xx_dma_client_out
= {
43 .name
= "I2S PCM Stereo out"
46 static struct s3c2410_dma_client s3c24xx_dma_client_in
= {
47 .name
= "I2S PCM Stereo in"
50 static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_out
= {
51 .client
= &s3c24xx_dma_client_out
,
52 .channel
= DMACH_I2S_OUT
,
53 .dma_addr
= S3C2410_PA_IIS
+ S3C2410_IISFIFO
,
57 static struct s3c24xx_pcm_dma_params s3c24xx_i2s_pcm_stereo_in
= {
58 .client
= &s3c24xx_dma_client_in
,
59 .channel
= DMACH_I2S_IN
,
60 .dma_addr
= S3C2410_PA_IIS
+ S3C2410_IISFIFO
,
64 struct s3c24xx_i2s_info
{
72 static struct s3c24xx_i2s_info s3c24xx_i2s
;
74 static void s3c24xx_snd_txctrl(int on
)
80 pr_debug("Entered %s\n", __func__
);
82 iisfcon
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISFCON
);
83 iiscon
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
84 iismod
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
86 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon
, iismod
, iisfcon
);
89 iisfcon
|= S3C2410_IISFCON_TXDMA
| S3C2410_IISFCON_TXENABLE
;
90 iiscon
|= S3C2410_IISCON_TXDMAEN
| S3C2410_IISCON_IISEN
;
91 iiscon
&= ~S3C2410_IISCON_TXIDLE
;
92 iismod
|= S3C2410_IISMOD_TXMODE
;
94 writel(iismod
, s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
95 writel(iisfcon
, s3c24xx_i2s
.regs
+ S3C2410_IISFCON
);
96 writel(iiscon
, s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
98 /* note, we have to disable the FIFOs otherwise bad things
99 * seem to happen when the DMA stops. According to the
100 * Samsung supplied kernel, this should allow the DMA
101 * engine and FIFOs to reset. If this isn't allowed, the
102 * DMA engine will simply freeze randomly.
105 iisfcon
&= ~S3C2410_IISFCON_TXENABLE
;
106 iisfcon
&= ~S3C2410_IISFCON_TXDMA
;
107 iiscon
|= S3C2410_IISCON_TXIDLE
;
108 iiscon
&= ~S3C2410_IISCON_TXDMAEN
;
109 iismod
&= ~S3C2410_IISMOD_TXMODE
;
111 writel(iiscon
, s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
112 writel(iisfcon
, s3c24xx_i2s
.regs
+ S3C2410_IISFCON
);
113 writel(iismod
, s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
116 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon
, iismod
, iisfcon
);
119 static void s3c24xx_snd_rxctrl(int on
)
125 pr_debug("Entered %s\n", __func__
);
127 iisfcon
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISFCON
);
128 iiscon
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
129 iismod
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
131 pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon
, iismod
, iisfcon
);
134 iisfcon
|= S3C2410_IISFCON_RXDMA
| S3C2410_IISFCON_RXENABLE
;
135 iiscon
|= S3C2410_IISCON_RXDMAEN
| S3C2410_IISCON_IISEN
;
136 iiscon
&= ~S3C2410_IISCON_RXIDLE
;
137 iismod
|= S3C2410_IISMOD_RXMODE
;
139 writel(iismod
, s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
140 writel(iisfcon
, s3c24xx_i2s
.regs
+ S3C2410_IISFCON
);
141 writel(iiscon
, s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
143 /* note, we have to disable the FIFOs otherwise bad things
144 * seem to happen when the DMA stops. According to the
145 * Samsung supplied kernel, this should allow the DMA
146 * engine and FIFOs to reset. If this isn't allowed, the
147 * DMA engine will simply freeze randomly.
150 iisfcon
&= ~S3C2410_IISFCON_RXENABLE
;
151 iisfcon
&= ~S3C2410_IISFCON_RXDMA
;
152 iiscon
|= S3C2410_IISCON_RXIDLE
;
153 iiscon
&= ~S3C2410_IISCON_RXDMAEN
;
154 iismod
&= ~S3C2410_IISMOD_RXMODE
;
156 writel(iisfcon
, s3c24xx_i2s
.regs
+ S3C2410_IISFCON
);
157 writel(iiscon
, s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
158 writel(iismod
, s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
161 pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon
, iismod
, iisfcon
);
165 * Wait for the LR signal to allow synchronisation to the L/R clock
166 * from the codec. May only be needed for slave mode.
168 static int s3c24xx_snd_lrsync(void)
171 int timeout
= 50; /* 5ms */
173 pr_debug("Entered %s\n", __func__
);
176 iiscon
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
177 if (iiscon
& S3C2410_IISCON_LRINDEX
)
189 * Check whether CPU is the master or slave
191 static inline int s3c24xx_snd_is_clkmaster(void)
193 pr_debug("Entered %s\n", __func__
);
195 return (readl(s3c24xx_i2s
.regs
+ S3C2410_IISMOD
) & S3C2410_IISMOD_SLAVE
) ? 0:1;
199 * Set S3C24xx I2S DAI format
201 static int s3c24xx_i2s_set_fmt(struct snd_soc_dai
*cpu_dai
,
206 pr_debug("Entered %s\n", __func__
);
208 iismod
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
209 pr_debug("hw_params r: IISMOD: %x \n", iismod
);
211 switch (fmt
& SND_SOC_DAIFMT_MASTER_MASK
) {
212 case SND_SOC_DAIFMT_CBM_CFM
:
213 iismod
|= S3C2410_IISMOD_SLAVE
;
215 case SND_SOC_DAIFMT_CBS_CFS
:
216 iismod
&= ~S3C2410_IISMOD_SLAVE
;
222 switch (fmt
& SND_SOC_DAIFMT_FORMAT_MASK
) {
223 case SND_SOC_DAIFMT_LEFT_J
:
224 iismod
|= S3C2410_IISMOD_MSB
;
226 case SND_SOC_DAIFMT_I2S
:
227 iismod
&= ~S3C2410_IISMOD_MSB
;
233 writel(iismod
, s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
234 pr_debug("hw_params w: IISMOD: %x \n", iismod
);
238 static int s3c24xx_i2s_hw_params(struct snd_pcm_substream
*substream
,
239 struct snd_pcm_hw_params
*params
,
240 struct snd_soc_dai
*dai
)
242 struct snd_soc_pcm_runtime
*rtd
= substream
->private_data
;
245 pr_debug("Entered %s\n", __func__
);
247 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
248 rtd
->dai
->cpu_dai
->dma_data
= &s3c24xx_i2s_pcm_stereo_out
;
250 rtd
->dai
->cpu_dai
->dma_data
= &s3c24xx_i2s_pcm_stereo_in
;
252 /* Working copies of register */
253 iismod
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
254 pr_debug("hw_params r: IISMOD: %x\n", iismod
);
256 switch (params_format(params
)) {
257 case SNDRV_PCM_FORMAT_S8
:
258 iismod
&= ~S3C2410_IISMOD_16BIT
;
259 ((struct s3c24xx_pcm_dma_params
*)
260 rtd
->dai
->cpu_dai
->dma_data
)->dma_size
= 1;
262 case SNDRV_PCM_FORMAT_S16_LE
:
263 iismod
|= S3C2410_IISMOD_16BIT
;
264 ((struct s3c24xx_pcm_dma_params
*)
265 rtd
->dai
->cpu_dai
->dma_data
)->dma_size
= 2;
271 writel(iismod
, s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
272 pr_debug("hw_params w: IISMOD: %x\n", iismod
);
276 static int s3c24xx_i2s_trigger(struct snd_pcm_substream
*substream
, int cmd
,
277 struct snd_soc_dai
*dai
)
281 pr_debug("Entered %s\n", __func__
);
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_dai
*cpu_dai
,
319 int clk_id
, unsigned int freq
, int dir
)
321 u32 iismod
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
323 pr_debug("Entered %s\n", __func__
);
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_dai
*cpu_dai
,
349 pr_debug("Entered %s\n", __func__
);
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
,
383 struct snd_soc_dai
*dai
)
385 pr_debug("Entered %s\n", __func__
);
387 s3c24xx_i2s
.regs
= ioremap(S3C2410_PA_IIS
, 0x100);
388 if (s3c24xx_i2s
.regs
== NULL
)
391 s3c24xx_i2s
.iis_clk
= clk_get(&pdev
->dev
, "iis");
392 if (s3c24xx_i2s
.iis_clk
== NULL
) {
393 pr_err("failed to get iis_clock\n");
394 iounmap(s3c24xx_i2s
.regs
);
397 clk_enable(s3c24xx_i2s
.iis_clk
);
399 /* Configure the I2S pins in correct mode */
400 s3c2410_gpio_cfgpin(S3C2410_GPE0
, S3C2410_GPE0_I2SLRCK
);
401 s3c2410_gpio_cfgpin(S3C2410_GPE1
, S3C2410_GPE1_I2SSCLK
);
402 s3c2410_gpio_cfgpin(S3C2410_GPE2
, S3C2410_GPE2_CDCLK
);
403 s3c2410_gpio_cfgpin(S3C2410_GPE3
, S3C2410_GPE3_I2SSDI
);
404 s3c2410_gpio_cfgpin(S3C2410_GPE4
, S3C2410_GPE4_I2SSDO
);
406 writel(S3C2410_IISCON_IISEN
, s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
408 s3c24xx_snd_txctrl(0);
409 s3c24xx_snd_rxctrl(0);
415 static int s3c24xx_i2s_suspend(struct snd_soc_dai
*cpu_dai
)
417 pr_debug("Entered %s\n", __func__
);
419 s3c24xx_i2s
.iiscon
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
420 s3c24xx_i2s
.iismod
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
421 s3c24xx_i2s
.iisfcon
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISFCON
);
422 s3c24xx_i2s
.iispsr
= readl(s3c24xx_i2s
.regs
+ S3C2410_IISPSR
);
424 clk_disable(s3c24xx_i2s
.iis_clk
);
429 static int s3c24xx_i2s_resume(struct snd_soc_dai
*cpu_dai
)
431 pr_debug("Entered %s\n", __func__
);
432 clk_enable(s3c24xx_i2s
.iis_clk
);
434 writel(s3c24xx_i2s
.iiscon
, s3c24xx_i2s
.regs
+ S3C2410_IISCON
);
435 writel(s3c24xx_i2s
.iismod
, s3c24xx_i2s
.regs
+ S3C2410_IISMOD
);
436 writel(s3c24xx_i2s
.iisfcon
, s3c24xx_i2s
.regs
+ S3C2410_IISFCON
);
437 writel(s3c24xx_i2s
.iispsr
, s3c24xx_i2s
.regs
+ S3C2410_IISPSR
);
442 #define s3c24xx_i2s_suspend NULL
443 #define s3c24xx_i2s_resume NULL
447 #define S3C24XX_I2S_RATES \
448 (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
449 SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
450 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
452 static struct snd_soc_dai_ops s3c24xx_i2s_dai_ops
= {
453 .trigger
= s3c24xx_i2s_trigger
,
454 .hw_params
= s3c24xx_i2s_hw_params
,
455 .set_fmt
= s3c24xx_i2s_set_fmt
,
456 .set_clkdiv
= s3c24xx_i2s_set_clkdiv
,
457 .set_sysclk
= s3c24xx_i2s_set_sysclk
,
460 struct snd_soc_dai s3c24xx_i2s_dai
= {
461 .name
= "s3c24xx-i2s",
463 .probe
= s3c24xx_i2s_probe
,
464 .suspend
= s3c24xx_i2s_suspend
,
465 .resume
= s3c24xx_i2s_resume
,
469 .rates
= S3C24XX_I2S_RATES
,
470 .formats
= SNDRV_PCM_FMTBIT_S8
| SNDRV_PCM_FMTBIT_S16_LE
,},
474 .rates
= S3C24XX_I2S_RATES
,
475 .formats
= SNDRV_PCM_FMTBIT_S8
| SNDRV_PCM_FMTBIT_S16_LE
,},
476 .ops
= &s3c24xx_i2s_dai_ops
,
478 EXPORT_SYMBOL_GPL(s3c24xx_i2s_dai
);
480 static int __init
s3c24xx_i2s_init(void)
482 return snd_soc_register_dai(&s3c24xx_i2s_dai
);
484 module_init(s3c24xx_i2s_init
);
486 static void __exit
s3c24xx_i2s_exit(void)
488 snd_soc_unregister_dai(&s3c24xx_i2s_dai
);
490 module_exit(s3c24xx_i2s_exit
);
492 /* Module information */
493 MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
494 MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
495 MODULE_LICENSE("GPL");