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linux-sg2042/sound/soc/samsung/spdif.c

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/* sound/soc/samsung/spdif.c
*
* ALSA SoC Audio Layer - Samsung S/PDIF Controller driver
*
* Copyright (c) 2010 Samsung Electronics Co. Ltd
* http://www.samsung.com/
*
* 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/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include <plat/audio.h>
#include <mach/dma.h>
#include "dma.h"
#include "spdif.h"
/* Registers */
#define CLKCON 0x00
#define CON 0x04
#define BSTAS 0x08
#define CSTAS 0x0C
#define DATA_OUTBUF 0x10
#define DCNT 0x14
#define BSTAS_S 0x18
#define DCNT_S 0x1C
#define CLKCTL_MASK 0x7
#define CLKCTL_MCLK_EXT (0x1 << 2)
#define CLKCTL_PWR_ON (0x1 << 0)
#define CON_MASK 0x3ffffff
#define CON_FIFO_TH_SHIFT 19
#define CON_FIFO_TH_MASK (0x7 << 19)
#define CON_USERDATA_23RDBIT (0x1 << 12)
#define CON_SW_RESET (0x1 << 5)
#define CON_MCLKDIV_MASK (0x3 << 3)
#define CON_MCLKDIV_256FS (0x0 << 3)
#define CON_MCLKDIV_384FS (0x1 << 3)
#define CON_MCLKDIV_512FS (0x2 << 3)
#define CON_PCM_MASK (0x3 << 1)
#define CON_PCM_16BIT (0x0 << 1)
#define CON_PCM_20BIT (0x1 << 1)
#define CON_PCM_24BIT (0x2 << 1)
#define CON_PCM_DATA (0x1 << 0)
#define CSTAS_MASK 0x3fffffff
#define CSTAS_SAMP_FREQ_MASK (0xF << 24)
#define CSTAS_SAMP_FREQ_44 (0x0 << 24)
#define CSTAS_SAMP_FREQ_48 (0x2 << 24)
#define CSTAS_SAMP_FREQ_32 (0x3 << 24)
#define CSTAS_SAMP_FREQ_96 (0xA << 24)
#define CSTAS_CATEGORY_MASK (0xFF << 8)
#define CSTAS_CATEGORY_CODE_CDP (0x01 << 8)
#define CSTAS_NO_COPYRIGHT (0x1 << 2)
/**
* struct samsung_spdif_info - Samsung S/PDIF Controller information
* @lock: Spin lock for S/PDIF.
* @dev: The parent device passed to use from the probe.
* @regs: The pointer to the device register block.
* @clk_rate: Current clock rate for calcurate ratio.
* @pclk: The peri-clock pointer for spdif master operation.
* @sclk: The source clock pointer for making sync signals.
* @save_clkcon: Backup clkcon reg. in suspend.
* @save_con: Backup con reg. in suspend.
* @save_cstas: Backup cstas reg. in suspend.
* @dma_playback: DMA information for playback channel.
*/
struct samsung_spdif_info {
spinlock_t lock;
struct device *dev;
void __iomem *regs;
unsigned long clk_rate;
struct clk *pclk;
struct clk *sclk;
u32 saved_clkcon;
u32 saved_con;
u32 saved_cstas;
struct s3c_dma_params *dma_playback;
};
static struct s3c2410_dma_client spdif_dma_client_out = {
.name = "S/PDIF Stereo out",
};
static struct s3c_dma_params spdif_stereo_out;
static struct samsung_spdif_info spdif_info;
static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai)
{
return snd_soc_dai_get_drvdata(cpu_dai);
}
static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on)
{
void __iomem *regs = spdif->regs;
u32 clkcon;
dev_dbg(spdif->dev, "Entered %s\n", __func__);
clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
if (on)
writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON);
else
writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
}
static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir)
{
struct samsung_spdif_info *spdif = to_info(cpu_dai);
u32 clkcon;
dev_dbg(spdif->dev, "Entered %s\n", __func__);
clkcon = readl(spdif->regs + CLKCON);
if (clk_id == SND_SOC_SPDIF_INT_MCLK)
clkcon &= ~CLKCTL_MCLK_EXT;
else
clkcon |= CLKCTL_MCLK_EXT;
writel(clkcon, spdif->regs + CLKCON);
spdif->clk_rate = freq;
return 0;
}
static int spdif_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
unsigned long flags;
dev_dbg(spdif->dev, "Entered %s\n", __func__);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
spin_lock_irqsave(&spdif->lock, flags);
spdif_snd_txctrl(spdif, 1);
spin_unlock_irqrestore(&spdif->lock, flags);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
spin_lock_irqsave(&spdif->lock, flags);
spdif_snd_txctrl(spdif, 0);
spin_unlock_irqrestore(&spdif->lock, flags);
break;
default:
return -EINVAL;
}
return 0;
}
static int spdif_sysclk_ratios[] = {
512, 384, 256,
};
static int spdif_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *socdai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
void __iomem *regs = spdif->regs;
struct s3c_dma_params *dma_data;
u32 con, clkcon, cstas;
unsigned long flags;
int i, ratio;
dev_dbg(spdif->dev, "Entered %s\n", __func__);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
dma_data = spdif->dma_playback;
else {
dev_err(spdif->dev, "Capture is not supported\n");
return -EINVAL;
}
snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data);
spin_lock_irqsave(&spdif->lock, flags);
con = readl(regs + CON) & CON_MASK;
cstas = readl(regs + CSTAS) & CSTAS_MASK;
clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
con &= ~CON_FIFO_TH_MASK;
con |= (0x7 << CON_FIFO_TH_SHIFT);
con |= CON_USERDATA_23RDBIT;
con |= CON_PCM_DATA;
con &= ~CON_PCM_MASK;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
con |= CON_PCM_16BIT;
break;
default:
dev_err(spdif->dev, "Unsupported data size.\n");
goto err;
}
ratio = spdif->clk_rate / params_rate(params);
for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++)
if (ratio == spdif_sysclk_ratios[i])
break;
if (i == ARRAY_SIZE(spdif_sysclk_ratios)) {
dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n",
spdif->clk_rate, params_rate(params));
goto err;
}
con &= ~CON_MCLKDIV_MASK;
switch (ratio) {
case 256:
con |= CON_MCLKDIV_256FS;
break;
case 384:
con |= CON_MCLKDIV_384FS;
break;
case 512:
con |= CON_MCLKDIV_512FS;
break;
}
cstas &= ~CSTAS_SAMP_FREQ_MASK;
switch (params_rate(params)) {
case 44100:
cstas |= CSTAS_SAMP_FREQ_44;
break;
case 48000:
cstas |= CSTAS_SAMP_FREQ_48;
break;
case 32000:
cstas |= CSTAS_SAMP_FREQ_32;
break;
case 96000:
cstas |= CSTAS_SAMP_FREQ_96;
break;
default:
dev_err(spdif->dev, "Invalid sampling rate %d\n",
params_rate(params));
goto err;
}
cstas &= ~CSTAS_CATEGORY_MASK;
cstas |= CSTAS_CATEGORY_CODE_CDP;
cstas |= CSTAS_NO_COPYRIGHT;
writel(con, regs + CON);
writel(cstas, regs + CSTAS);
writel(clkcon, regs + CLKCON);
spin_unlock_irqrestore(&spdif->lock, flags);
return 0;
err:
spin_unlock_irqrestore(&spdif->lock, flags);
return -EINVAL;
}
static void spdif_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai);
void __iomem *regs = spdif->regs;
u32 con, clkcon;
dev_dbg(spdif->dev, "Entered %s\n", __func__);
con = readl(regs + CON) & CON_MASK;
clkcon = readl(regs + CLKCON) & CLKCTL_MASK;
writel(con | CON_SW_RESET, regs + CON);
cpu_relax();
writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON);
}
#ifdef CONFIG_PM
static int spdif_suspend(struct snd_soc_dai *cpu_dai)
{
struct samsung_spdif_info *spdif = to_info(cpu_dai);
u32 con = spdif->saved_con;
dev_dbg(spdif->dev, "Entered %s\n", __func__);
spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK;
spdif->saved_con = readl(spdif->regs + CON) & CON_MASK;
spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK;
writel(con | CON_SW_RESET, spdif->regs + CON);
cpu_relax();
return 0;
}
static int spdif_resume(struct snd_soc_dai *cpu_dai)
{
struct samsung_spdif_info *spdif = to_info(cpu_dai);
dev_dbg(spdif->dev, "Entered %s\n", __func__);
writel(spdif->saved_clkcon, spdif->regs + CLKCON);
writel(spdif->saved_con, spdif->regs + CON);
writel(spdif->saved_cstas, spdif->regs + CSTAS);
return 0;
}
#else
#define spdif_suspend NULL
#define spdif_resume NULL
#endif
static const struct snd_soc_dai_ops spdif_dai_ops = {
.set_sysclk = spdif_set_sysclk,
.trigger = spdif_trigger,
.hw_params = spdif_hw_params,
.shutdown = spdif_shutdown,
};
static struct snd_soc_dai_driver samsung_spdif_dai = {
.name = "samsung-spdif",
.playback = {
.stream_name = "S/PDIF Playback",
.channels_min = 2,
.channels_max = 2,
.rates = (SNDRV_PCM_RATE_32000 |
SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000 |
SNDRV_PCM_RATE_96000),
.formats = SNDRV_PCM_FMTBIT_S16_LE, },
.ops = &spdif_dai_ops,
.suspend = spdif_suspend,
.resume = spdif_resume,
};
static __devinit int spdif_probe(struct platform_device *pdev)
{
struct s3c_audio_pdata *spdif_pdata;
struct resource *mem_res, *dma_res;
struct samsung_spdif_info *spdif;
int ret;
spdif_pdata = pdev->dev.platform_data;
dev_dbg(&pdev->dev, "Entered %s\n", __func__);
dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!dma_res) {
dev_err(&pdev->dev, "Unable to get dma resource.\n");
return -ENXIO;
}
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem_res) {
dev_err(&pdev->dev, "Unable to get register resource.\n");
return -ENXIO;
}
if (spdif_pdata && spdif_pdata->cfg_gpio
&& spdif_pdata->cfg_gpio(pdev)) {
dev_err(&pdev->dev, "Unable to configure GPIO pins\n");
return -EINVAL;
}
spdif = &spdif_info;
spdif->dev = &pdev->dev;
spin_lock_init(&spdif->lock);
spdif->pclk = clk_get(&pdev->dev, "spdif");
if (IS_ERR(spdif->pclk)) {
dev_err(&pdev->dev, "failed to get peri-clock\n");
ret = -ENOENT;
goto err0;
}
clk_enable(spdif->pclk);
spdif->sclk = clk_get(&pdev->dev, "sclk_spdif");
if (IS_ERR(spdif->sclk)) {
dev_err(&pdev->dev, "failed to get internal source clock\n");
ret = -ENOENT;
goto err1;
}
clk_enable(spdif->sclk);
/* Request S/PDIF Register's memory region */
if (!request_mem_region(mem_res->start,
resource_size(mem_res), "samsung-spdif")) {
dev_err(&pdev->dev, "Unable to request register region\n");
ret = -EBUSY;
goto err2;
}
spdif->regs = ioremap(mem_res->start, 0x100);
if (spdif->regs == NULL) {
dev_err(&pdev->dev, "Cannot ioremap registers\n");
ret = -ENXIO;
goto err3;
}
dev_set_drvdata(&pdev->dev, spdif);
ret = snd_soc_register_dai(&pdev->dev, &samsung_spdif_dai);
if (ret != 0) {
dev_err(&pdev->dev, "fail to register dai\n");
goto err4;
}
spdif_stereo_out.dma_size = 2;
spdif_stereo_out.client = &spdif_dma_client_out;
spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
spdif_stereo_out.channel = dma_res->start;
spdif->dma_playback = &spdif_stereo_out;
return 0;
err4:
iounmap(spdif->regs);
err3:
release_mem_region(mem_res->start, resource_size(mem_res));
err2:
clk_disable(spdif->sclk);
clk_put(spdif->sclk);
err1:
clk_disable(spdif->pclk);
clk_put(spdif->pclk);
err0:
return ret;
}
static __devexit int spdif_remove(struct platform_device *pdev)
{
struct samsung_spdif_info *spdif = &spdif_info;
struct resource *mem_res;
snd_soc_unregister_dai(&pdev->dev);
iounmap(spdif->regs);
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (mem_res)
release_mem_region(mem_res->start, resource_size(mem_res));
clk_disable(spdif->sclk);
clk_put(spdif->sclk);
clk_disable(spdif->pclk);
clk_put(spdif->pclk);
return 0;
}
static struct platform_driver samsung_spdif_driver = {
.probe = spdif_probe,
.remove = __devexit_p(spdif_remove),
.driver = {
.name = "samsung-spdif",
.owner = THIS_MODULE,
},
};
module_platform_driver(samsung_spdif_driver);
MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>");
MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:samsung-spdif");
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