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kernel-ark/sound/soc/s3c24xx/s3c64xx-i2s.c
Jassi Brar 0fe692292a ASoC: S3C64XX: Compress and generalize the CPU driver 
The driver can be 'generalized' a bit by not hardcoding '2'(the number of
I2Sv3 controllers that the driver can handle) at many places, instead we
define a macro for it. That makes it easier to increase number of controllers
by changing the parameter at just one place, this will be useful when there is
support for newer SoCs, which have the same controller, only more in number.

Signed-off-by: Jassi Brar <jassi.brar@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-12-16 17:31:03 +00:00

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/* sound/soc/s3c24xx/s3c64xx-i2s.c
*
* ALSA SoC Audio Layer - S3C64XX I2S driver
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/clk.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <sound/soc.h>
#include <plat/regs-s3c2412-iis.h>
#include <plat/gpio-bank-d.h>
#include <plat/gpio-bank-e.h>
#include <plat/gpio-cfg.h>
#include <mach/map.h>
#include <mach/dma.h>
#include "s3c-dma.h"
#include "s3c64xx-i2s.h"
/* The value should be set to maximum of the total number
* of I2Sv3 controllers that any supported SoC has.
*/
#define MAX_I2SV3 2
static struct s3c2410_dma_client s3c64xx_dma_client_out = {
.name = "I2S PCM Stereo out"
};
static struct s3c2410_dma_client s3c64xx_dma_client_in = {
.name = "I2S PCM Stereo in"
};
static struct s3c_dma_params s3c64xx_i2s_pcm_stereo_out[MAX_I2SV3];
static struct s3c_dma_params s3c64xx_i2s_pcm_stereo_in[MAX_I2SV3];
static struct s3c_i2sv2_info s3c64xx_i2s[MAX_I2SV3];
struct snd_soc_dai s3c64xx_i2s_dai[MAX_I2SV3];
EXPORT_SYMBOL_GPL(s3c64xx_i2s_dai);
static inline struct s3c_i2sv2_info *to_info(struct snd_soc_dai *cpu_dai)
{
return cpu_dai->private_data;
}
static int s3c64xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir)
{
struct s3c_i2sv2_info *i2s = to_info(cpu_dai);
u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
switch (clk_id) {
case S3C64XX_CLKSRC_PCLK:
iismod &= ~S3C64XX_IISMOD_IMS_SYSMUX;
break;
case S3C64XX_CLKSRC_MUX:
iismod |= S3C64XX_IISMOD_IMS_SYSMUX;
break;
case S3C64XX_CLKSRC_CDCLK:
switch (dir) {
case SND_SOC_CLOCK_IN:
iismod |= S3C64XX_IISMOD_CDCLKCON;
break;
case SND_SOC_CLOCK_OUT:
iismod &= ~S3C64XX_IISMOD_CDCLKCON;
break;
default:
return -EINVAL;
}
break;
default:
return -EINVAL;
}
writel(iismod, i2s->regs + S3C2412_IISMOD);
return 0;
}
struct clk *s3c64xx_i2s_get_clock(struct snd_soc_dai *dai)
{
struct s3c_i2sv2_info *i2s = to_info(dai);
u32 iismod = readl(i2s->regs + S3C2412_IISMOD);
if (iismod & S3C64XX_IISMOD_IMS_SYSMUX)
return i2s->iis_cclk;
else
return i2s->iis_pclk;
}
EXPORT_SYMBOL_GPL(s3c64xx_i2s_get_clock);
static int s3c64xx_i2s_probe(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
/* configure GPIO for i2s port */
switch (dai->id) {
case 0:
s3c_gpio_cfgpin(S3C64XX_GPD(0), S3C64XX_GPD0_I2S0_CLK);
s3c_gpio_cfgpin(S3C64XX_GPD(1), S3C64XX_GPD1_I2S0_CDCLK);
s3c_gpio_cfgpin(S3C64XX_GPD(2), S3C64XX_GPD2_I2S0_LRCLK);
s3c_gpio_cfgpin(S3C64XX_GPD(3), S3C64XX_GPD3_I2S0_DI);
s3c_gpio_cfgpin(S3C64XX_GPD(4), S3C64XX_GPD4_I2S0_D0);
break;
case 1:
s3c_gpio_cfgpin(S3C64XX_GPE(0), S3C64XX_GPE0_I2S1_CLK);
s3c_gpio_cfgpin(S3C64XX_GPE(1), S3C64XX_GPE1_I2S1_CDCLK);
s3c_gpio_cfgpin(S3C64XX_GPE(2), S3C64XX_GPE2_I2S1_LRCLK);
s3c_gpio_cfgpin(S3C64XX_GPE(3), S3C64XX_GPE3_I2S1_DI);
s3c_gpio_cfgpin(S3C64XX_GPE(4), S3C64XX_GPE4_I2S1_D0);
}
return 0;
}
#define S3C64XX_I2S_RATES \
(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
#define S3C64XX_I2S_FMTS \
(SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |\
SNDRV_PCM_FMTBIT_S24_LE)
static struct snd_soc_dai_ops s3c64xx_i2s_dai_ops = {
.set_sysclk = s3c64xx_i2s_set_sysclk,
};
static __devinit int s3c64xx_iis_dev_probe(struct platform_device *pdev)
{
struct s3c_i2sv2_info *i2s;
struct snd_soc_dai *dai;
int ret;
if (pdev->id >= MAX_I2SV3) {
dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
return -EINVAL;
}
i2s = &s3c64xx_i2s[pdev->id];
dai = &s3c64xx_i2s_dai[pdev->id];
dai->dev = &pdev->dev;
dai->name = "s3c64xx-i2s";
dai->id = pdev->id;
dai->symmetric_rates = 1;
dai->playback.channels_min = 2;
dai->playback.channels_max = 2;
dai->playback.rates = S3C64XX_I2S_RATES;
dai->playback.formats = S3C64XX_I2S_FMTS;
dai->capture.channels_min = 2;
dai->capture.channels_max = 2;
dai->capture.rates = S3C64XX_I2S_RATES;
dai->capture.formats = S3C64XX_I2S_FMTS;
dai->probe = s3c64xx_i2s_probe;
dai->ops = &s3c64xx_i2s_dai_ops;
i2s->dma_capture = &s3c64xx_i2s_pcm_stereo_in[pdev->id];
i2s->dma_playback = &s3c64xx_i2s_pcm_stereo_out[pdev->id];
if (pdev->id == 0) {
i2s->dma_capture->channel = DMACH_I2S0_IN;
i2s->dma_capture->dma_addr = S3C64XX_PA_IIS0 + S3C2412_IISRXD;
i2s->dma_playback->channel = DMACH_I2S0_OUT;
i2s->dma_playback->dma_addr = S3C64XX_PA_IIS0 + S3C2412_IISTXD;
} else {
i2s->dma_capture->channel = DMACH_I2S1_IN;
i2s->dma_capture->dma_addr = S3C64XX_PA_IIS1 + S3C2412_IISRXD;
i2s->dma_playback->channel = DMACH_I2S1_OUT;
i2s->dma_playback->dma_addr = S3C64XX_PA_IIS1 + S3C2412_IISTXD;
}
i2s->dma_capture->client = &s3c64xx_dma_client_in;
i2s->dma_capture->dma_size = 4;
i2s->dma_playback->client = &s3c64xx_dma_client_out;
i2s->dma_playback->dma_size = 4;
i2s->iis_cclk = clk_get(&pdev->dev, "audio-bus");
if (IS_ERR(i2s->iis_cclk)) {
dev_err(&pdev->dev, "failed to get audio-bus\n");
ret = PTR_ERR(i2s->iis_cclk);
goto err;
}
clk_enable(i2s->iis_cclk);
ret = s3c_i2sv2_probe(pdev, dai, i2s, 0);
if (ret)
goto err_clk;
ret = s3c_i2sv2_register_dai(dai);
if (ret != 0)
goto err_i2sv2;
return 0;
err_i2sv2:
/* Not implemented for I2Sv2 core yet */
err_clk:
clk_put(i2s->iis_cclk);
err:
return ret;
}
static __devexit int s3c64xx_iis_dev_remove(struct platform_device *pdev)
{
dev_err(&pdev->dev, "Device removal not yet supported\n");
return 0;
}
static struct platform_driver s3c64xx_iis_driver = {
.probe = s3c64xx_iis_dev_probe,
.remove = s3c64xx_iis_dev_remove,
.driver = {
.name = "s3c64xx-iis",
.owner = THIS_MODULE,
},
};
static int __init s3c64xx_i2s_init(void)
{
return platform_driver_register(&s3c64xx_iis_driver);
}
module_init(s3c64xx_i2s_init);
static void __exit s3c64xx_i2s_exit(void)
{
platform_driver_unregister(&s3c64xx_iis_driver);
}
module_exit(s3c64xx_i2s_exit);
/* Module information */
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
MODULE_DESCRIPTION("S3C64XX I2S SoC Interface");
MODULE_LICENSE("GPL");
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