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linux/sound/soc/samsung/spdif.c
Arnd Bergmann 9bdca822cb ASoC: samsung: pass filter function as pointer 
As we are now passing the filter data as pointers to the drivers,
we can take the final step and also pass the filter function the
same way. I'm keeping this change separate, as there it's less
obvious that this is a net win.

Upsides of this are:

- The ASoC drivers are completely independent from the DMA engine
  implementation, which simplifies the Kconfig logic and in theory
  allows the same sound drivers to be built in a kernel that supports
  different kinds of dmaengine drivers.

- Consistency with other subsystems and drivers

On the other hand, we have a few downsides:

- The s3c24xx-dma driver now needs to be built-in for the ac97 platform
  device to be instantiated on s3c2440.

- samsung_dmaengine_pcm_config cannot be marked 'const' any more
  because the filter function pointer needs to be set at runtime.
  This is safe as long we don't have multiple different DMA engines
  in thet same system at runtime, but is nonetheless ugly.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-11-21 13:27:22 +00:00

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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 <linux/platform_data/asoc-s3c.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 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_width(params)) {
case 16:
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 const struct snd_soc_component_driver samsung_spdif_component = {
.name = "samsung-spdif",
};
static int spdif_probe(struct platform_device *pdev)
{
struct s3c_audio_pdata *spdif_pdata;
struct resource *mem_res;
struct samsung_spdif_info *spdif;
dma_filter_fn filter;
int ret;
spdif_pdata = pdev->dev.platform_data;
dev_dbg(&pdev->dev, "Entered %s\n", __func__);
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 = devm_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_prepare_enable(spdif->pclk);
spdif->sclk = devm_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_prepare_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 = devm_snd_soc_register_component(&pdev->dev,
&samsung_spdif_component, &samsung_spdif_dai, 1);
if (ret != 0) {
dev_err(&pdev->dev, "fail to register dai\n");
goto err4;
}
spdif_stereo_out.dma_size = 2;
spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF;
filter = NULL;
if (spdif_pdata) {
spdif_stereo_out.slave = spdif_pdata->dma_playback;
filter = spdif_pdata->dma_filter;
}
spdif->dma_playback = &spdif_stereo_out;
ret = samsung_asoc_dma_platform_register(&pdev->dev, filter);
if (ret) {
dev_err(&pdev->dev, "failed to register DMA: %d\n", ret);
goto err4;
}
return 0;
err4:
iounmap(spdif->regs);
err3:
release_mem_region(mem_res->start, resource_size(mem_res));
err2:
clk_disable_unprepare(spdif->sclk);
err1:
clk_disable_unprepare(spdif->pclk);
err0:
return ret;
}
static int spdif_remove(struct platform_device *pdev)
{
struct samsung_spdif_info *spdif = &spdif_info;
struct resource *mem_res;
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_unprepare(spdif->sclk);
clk_disable_unprepare(spdif->pclk);
return 0;
}
static struct platform_driver samsung_spdif_driver = {
.probe = spdif_probe,
.remove = spdif_remove,
.driver = {
.name = "samsung-spdif",
},
};
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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