477 lines
12 KiB
C
Executable file
477 lines
12 KiB
C
Executable file
/*
|
|
* s3c24xx-i2s.c -- ALSA Soc Audio Layer
|
|
*
|
|
* (c) 2006 Wolfson Microelectronics PLC.
|
|
* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
|
|
*
|
|
* Copyright 2004-2005 Simtec Electronics
|
|
* http://armlinux.simtec.co.uk/
|
|
* Ben Dooks <ben@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 as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <sound/soc.h>
|
|
#include <sound/pcm_params.h>
|
|
|
|
#include <mach/gpio-samsung.h>
|
|
#include <plat/gpio-cfg.h>
|
|
#include "regs-iis.h"
|
|
|
|
#include "dma.h"
|
|
#include "s3c24xx-i2s.h"
|
|
|
|
static struct snd_dmaengine_dai_dma_data s3c24xx_i2s_pcm_stereo_out = {
|
|
.chan_name = "tx",
|
|
.addr_width = 2,
|
|
};
|
|
|
|
static struct snd_dmaengine_dai_dma_data s3c24xx_i2s_pcm_stereo_in = {
|
|
.chan_name = "rx",
|
|
.addr_width = 2,
|
|
};
|
|
|
|
struct s3c24xx_i2s_info {
|
|
void __iomem *regs;
|
|
struct clk *iis_clk;
|
|
u32 iiscon;
|
|
u32 iismod;
|
|
u32 iisfcon;
|
|
u32 iispsr;
|
|
};
|
|
static struct s3c24xx_i2s_info s3c24xx_i2s;
|
|
|
|
static void s3c24xx_snd_txctrl(int on)
|
|
{
|
|
u32 iisfcon;
|
|
u32 iiscon;
|
|
u32 iismod;
|
|
|
|
iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
|
|
iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
|
|
pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
|
|
|
|
if (on) {
|
|
iisfcon |= S3C2410_IISFCON_TXDMA | S3C2410_IISFCON_TXENABLE;
|
|
iiscon |= S3C2410_IISCON_TXDMAEN | S3C2410_IISCON_IISEN;
|
|
iiscon &= ~S3C2410_IISCON_TXIDLE;
|
|
iismod |= S3C2410_IISMOD_TXMODE;
|
|
|
|
writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
|
|
writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
} else {
|
|
/* note, we have to disable the FIFOs otherwise bad things
|
|
* seem to happen when the DMA stops. According to the
|
|
* Samsung supplied kernel, this should allow the DMA
|
|
* engine and FIFOs to reset. If this isn't allowed, the
|
|
* DMA engine will simply freeze randomly.
|
|
*/
|
|
|
|
iisfcon &= ~S3C2410_IISFCON_TXENABLE;
|
|
iisfcon &= ~S3C2410_IISFCON_TXDMA;
|
|
iiscon |= S3C2410_IISCON_TXIDLE;
|
|
iiscon &= ~S3C2410_IISCON_TXDMAEN;
|
|
iismod &= ~S3C2410_IISMOD_TXMODE;
|
|
|
|
writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
|
|
writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
}
|
|
|
|
pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
|
|
}
|
|
|
|
static void s3c24xx_snd_rxctrl(int on)
|
|
{
|
|
u32 iisfcon;
|
|
u32 iiscon;
|
|
u32 iismod;
|
|
|
|
iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
|
|
iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
|
|
pr_debug("r: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
|
|
|
|
if (on) {
|
|
iisfcon |= S3C2410_IISFCON_RXDMA | S3C2410_IISFCON_RXENABLE;
|
|
iiscon |= S3C2410_IISCON_RXDMAEN | S3C2410_IISCON_IISEN;
|
|
iiscon &= ~S3C2410_IISCON_RXIDLE;
|
|
iismod |= S3C2410_IISMOD_RXMODE;
|
|
|
|
writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
|
|
writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
} else {
|
|
/* note, we have to disable the FIFOs otherwise bad things
|
|
* seem to happen when the DMA stops. According to the
|
|
* Samsung supplied kernel, this should allow the DMA
|
|
* engine and FIFOs to reset. If this isn't allowed, the
|
|
* DMA engine will simply freeze randomly.
|
|
*/
|
|
|
|
iisfcon &= ~S3C2410_IISFCON_RXENABLE;
|
|
iisfcon &= ~S3C2410_IISFCON_RXDMA;
|
|
iiscon |= S3C2410_IISCON_RXIDLE;
|
|
iiscon &= ~S3C2410_IISCON_RXDMAEN;
|
|
iismod &= ~S3C2410_IISMOD_RXMODE;
|
|
|
|
writel(iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
|
|
writel(iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
}
|
|
|
|
pr_debug("w: IISCON: %x IISMOD: %x IISFCON: %x\n", iiscon, iismod, iisfcon);
|
|
}
|
|
|
|
/*
|
|
* Wait for the LR signal to allow synchronisation to the L/R clock
|
|
* from the codec. May only be needed for slave mode.
|
|
*/
|
|
static int s3c24xx_snd_lrsync(void)
|
|
{
|
|
u32 iiscon;
|
|
int timeout = 50; /* 5ms */
|
|
|
|
while (1) {
|
|
iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
if (iiscon & S3C2410_IISCON_LRINDEX)
|
|
break;
|
|
|
|
if (!timeout--)
|
|
return -ETIMEDOUT;
|
|
udelay(100);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check whether CPU is the master or slave
|
|
*/
|
|
static inline int s3c24xx_snd_is_clkmaster(void)
|
|
{
|
|
return (readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & S3C2410_IISMOD_SLAVE) ? 0:1;
|
|
}
|
|
|
|
/*
|
|
* Set S3C24xx I2S DAI format
|
|
*/
|
|
static int s3c24xx_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
|
|
unsigned int fmt)
|
|
{
|
|
u32 iismod;
|
|
|
|
iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
pr_debug("hw_params r: IISMOD: %x \n", iismod);
|
|
|
|
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
|
|
case SND_SOC_DAIFMT_CBM_CFM:
|
|
iismod |= S3C2410_IISMOD_SLAVE;
|
|
break;
|
|
case SND_SOC_DAIFMT_CBS_CFS:
|
|
iismod &= ~S3C2410_IISMOD_SLAVE;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
|
|
case SND_SOC_DAIFMT_LEFT_J:
|
|
iismod |= S3C2410_IISMOD_MSB;
|
|
break;
|
|
case SND_SOC_DAIFMT_I2S:
|
|
iismod &= ~S3C2410_IISMOD_MSB;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
pr_debug("hw_params w: IISMOD: %x \n", iismod);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3c24xx_i2s_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct snd_dmaengine_dai_dma_data *dma_data;
|
|
u32 iismod;
|
|
|
|
dma_data = snd_soc_dai_get_dma_data(dai, substream);
|
|
|
|
/* Working copies of register */
|
|
iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
pr_debug("hw_params r: IISMOD: %x\n", iismod);
|
|
|
|
switch (params_width(params)) {
|
|
case 8:
|
|
iismod &= ~S3C2410_IISMOD_16BIT;
|
|
dma_data->addr_width = 1;
|
|
break;
|
|
case 16:
|
|
iismod |= S3C2410_IISMOD_16BIT;
|
|
dma_data->addr_width = 2;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
pr_debug("hw_params w: IISMOD: %x\n", iismod);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3c24xx_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
if (!s3c24xx_snd_is_clkmaster()) {
|
|
ret = s3c24xx_snd_lrsync();
|
|
if (ret)
|
|
goto exit_err;
|
|
}
|
|
|
|
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
|
|
s3c24xx_snd_rxctrl(1);
|
|
else
|
|
s3c24xx_snd_txctrl(1);
|
|
|
|
break;
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
|
|
s3c24xx_snd_rxctrl(0);
|
|
else
|
|
s3c24xx_snd_txctrl(0);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
exit_err:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Set S3C24xx Clock source
|
|
*/
|
|
static int s3c24xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
|
|
int clk_id, unsigned int freq, int dir)
|
|
{
|
|
u32 iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
|
|
iismod &= ~S3C2440_IISMOD_MPLL;
|
|
|
|
switch (clk_id) {
|
|
case S3C24XX_CLKSRC_PCLK:
|
|
break;
|
|
case S3C24XX_CLKSRC_MPLL:
|
|
iismod |= S3C2440_IISMOD_MPLL;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
writel(iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set S3C24xx Clock dividers
|
|
*/
|
|
static int s3c24xx_i2s_set_clkdiv(struct snd_soc_dai *cpu_dai,
|
|
int div_id, int div)
|
|
{
|
|
u32 reg;
|
|
|
|
switch (div_id) {
|
|
case S3C24XX_DIV_BCLK:
|
|
reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~S3C2410_IISMOD_FS_MASK;
|
|
writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
break;
|
|
case S3C24XX_DIV_MCLK:
|
|
reg = readl(s3c24xx_i2s.regs + S3C2410_IISMOD) & ~(S3C2410_IISMOD_384FS);
|
|
writel(reg | div, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
break;
|
|
case S3C24XX_DIV_PRESCALER:
|
|
writel(div, s3c24xx_i2s.regs + S3C2410_IISPSR);
|
|
reg = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
writel(reg | S3C2410_IISCON_PSCEN, s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* To avoid duplicating clock code, allow machine driver to
|
|
* get the clockrate from here.
|
|
*/
|
|
u32 s3c24xx_i2s_get_clockrate(void)
|
|
{
|
|
return clk_get_rate(s3c24xx_i2s.iis_clk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(s3c24xx_i2s_get_clockrate);
|
|
|
|
static int s3c24xx_i2s_probe(struct snd_soc_dai *dai)
|
|
{
|
|
int ret;
|
|
snd_soc_dai_init_dma_data(dai, &s3c24xx_i2s_pcm_stereo_out,
|
|
&s3c24xx_i2s_pcm_stereo_in);
|
|
|
|
s3c24xx_i2s.iis_clk = devm_clk_get(dai->dev, "iis");
|
|
if (IS_ERR(s3c24xx_i2s.iis_clk)) {
|
|
pr_err("failed to get iis_clock\n");
|
|
return PTR_ERR(s3c24xx_i2s.iis_clk);
|
|
}
|
|
ret = clk_prepare_enable(s3c24xx_i2s.iis_clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* Configure the I2S pins (GPE0...GPE4) in correct mode */
|
|
s3c_gpio_cfgall_range(S3C2410_GPE(0), 5, S3C_GPIO_SFN(2),
|
|
S3C_GPIO_PULL_NONE);
|
|
|
|
writel(S3C2410_IISCON_IISEN, s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
|
|
s3c24xx_snd_txctrl(0);
|
|
s3c24xx_snd_rxctrl(0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int s3c24xx_i2s_suspend(struct snd_soc_dai *cpu_dai)
|
|
{
|
|
s3c24xx_i2s.iiscon = readl(s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
s3c24xx_i2s.iismod = readl(s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
s3c24xx_i2s.iisfcon = readl(s3c24xx_i2s.regs + S3C2410_IISFCON);
|
|
s3c24xx_i2s.iispsr = readl(s3c24xx_i2s.regs + S3C2410_IISPSR);
|
|
|
|
clk_disable_unprepare(s3c24xx_i2s.iis_clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s3c24xx_i2s_resume(struct snd_soc_dai *cpu_dai)
|
|
{
|
|
int ret;
|
|
|
|
ret = clk_prepare_enable(s3c24xx_i2s.iis_clk);
|
|
if (ret)
|
|
return ret;
|
|
|
|
writel(s3c24xx_i2s.iiscon, s3c24xx_i2s.regs + S3C2410_IISCON);
|
|
writel(s3c24xx_i2s.iismod, s3c24xx_i2s.regs + S3C2410_IISMOD);
|
|
writel(s3c24xx_i2s.iisfcon, s3c24xx_i2s.regs + S3C2410_IISFCON);
|
|
writel(s3c24xx_i2s.iispsr, s3c24xx_i2s.regs + S3C2410_IISPSR);
|
|
|
|
return 0;
|
|
}
|
|
#else
|
|
#define s3c24xx_i2s_suspend NULL
|
|
#define s3c24xx_i2s_resume NULL
|
|
#endif
|
|
|
|
#define S3C24XX_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)
|
|
|
|
static const struct snd_soc_dai_ops s3c24xx_i2s_dai_ops = {
|
|
.trigger = s3c24xx_i2s_trigger,
|
|
.hw_params = s3c24xx_i2s_hw_params,
|
|
.set_fmt = s3c24xx_i2s_set_fmt,
|
|
.set_clkdiv = s3c24xx_i2s_set_clkdiv,
|
|
.set_sysclk = s3c24xx_i2s_set_sysclk,
|
|
};
|
|
|
|
static struct snd_soc_dai_driver s3c24xx_i2s_dai = {
|
|
.probe = s3c24xx_i2s_probe,
|
|
.suspend = s3c24xx_i2s_suspend,
|
|
.resume = s3c24xx_i2s_resume,
|
|
.playback = {
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = S3C24XX_I2S_RATES,
|
|
.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
|
|
.capture = {
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = S3C24XX_I2S_RATES,
|
|
.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE,},
|
|
.ops = &s3c24xx_i2s_dai_ops,
|
|
};
|
|
|
|
static const struct snd_soc_component_driver s3c24xx_i2s_component = {
|
|
.name = "s3c24xx-i2s",
|
|
};
|
|
|
|
static int s3c24xx_iis_dev_probe(struct platform_device *pdev)
|
|
{
|
|
struct resource *res;
|
|
int ret;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
s3c24xx_i2s.regs = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(s3c24xx_i2s.regs))
|
|
return PTR_ERR(s3c24xx_i2s.regs);
|
|
|
|
s3c24xx_i2s_pcm_stereo_out.addr = res->start + S3C2410_IISFIFO;
|
|
s3c24xx_i2s_pcm_stereo_in.addr = res->start + S3C2410_IISFIFO;
|
|
|
|
ret = samsung_asoc_dma_platform_register(&pdev->dev, NULL,
|
|
NULL, NULL);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Failed to register the DMA: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_snd_soc_register_component(&pdev->dev,
|
|
&s3c24xx_i2s_component, &s3c24xx_i2s_dai, 1);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "Failed to register the DAI\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct platform_driver s3c24xx_iis_driver = {
|
|
.probe = s3c24xx_iis_dev_probe,
|
|
.driver = {
|
|
.name = "s3c24xx-iis",
|
|
},
|
|
};
|
|
|
|
module_platform_driver(s3c24xx_iis_driver);
|
|
|
|
/* Module information */
|
|
MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
|
|
MODULE_DESCRIPTION("s3c24xx I2S SoC Interface");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:s3c24xx-iis");
|