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linux_dsm_epyc7002/sound/soc/samsung/pcm.c
Marek Szyprowski 73f5dfc683 ASoC: samsung: get access to DMA engine early to defer probe properly 
ASoC Samsung sub-drivers tried to get access to their DMA engine
controllers as a last step in driver probe. If a DMA engine was not
available yet, samsung_asoc_dma_platform_register() function ended in
-EPROBE_DEFER, but the driver already registered its component to ASoC
core. This patch moves samsung_asoc_dma_platform_register() call before
registering any components, to the common place, where driver was gathering
all needed resources.

In case of Samsung Exynos i2s driver the issue was even worse. The driver
managed already to register its secondary DAI platform device before
even getting the DMA engine access. That together with -EPROBE_DEFER error
code from samsung_i2s_probe() immediately triggered another round of
deferred probe retry and in turn endless loop of driver probing.

This patch fixes broken boot on Odroid XU3 and other Exynos5422-based
boards.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2016-10-28 18:21:13 +01:00

632 lines
16 KiB
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/* sound/soc/samsung/pcm.c
*
* ALSA SoC Audio Layer - S3C PCM-Controller driver
*
* Copyright (c) 2009 Samsung Electronics Co. Ltd
* Author: Jaswinder Singh <jassisinghbrar@gmail.com>
* based upon I2S drivers by Ben Dooks.
*
* 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 <linux/pm_runtime.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include <linux/platform_data/asoc-s3c.h>
#include "dma.h"
#include "pcm.h"
/*Register Offsets */
#define S3C_PCM_CTL 0x00
#define S3C_PCM_CLKCTL 0x04
#define S3C_PCM_TXFIFO 0x08
#define S3C_PCM_RXFIFO 0x0C
#define S3C_PCM_IRQCTL 0x10
#define S3C_PCM_IRQSTAT 0x14
#define S3C_PCM_FIFOSTAT 0x18
#define S3C_PCM_CLRINT 0x20
/* PCM_CTL Bit-Fields */
#define S3C_PCM_CTL_TXDIPSTICK_MASK 0x3f
#define S3C_PCM_CTL_TXDIPSTICK_SHIFT 13
#define S3C_PCM_CTL_RXDIPSTICK_MASK 0x3f
#define S3C_PCM_CTL_RXDIPSTICK_SHIFT 7
#define S3C_PCM_CTL_TXDMA_EN (0x1 << 6)
#define S3C_PCM_CTL_RXDMA_EN (0x1 << 5)
#define S3C_PCM_CTL_TXMSB_AFTER_FSYNC (0x1 << 4)
#define S3C_PCM_CTL_RXMSB_AFTER_FSYNC (0x1 << 3)
#define S3C_PCM_CTL_TXFIFO_EN (0x1 << 2)
#define S3C_PCM_CTL_RXFIFO_EN (0x1 << 1)
#define S3C_PCM_CTL_ENABLE (0x1 << 0)
/* PCM_CLKCTL Bit-Fields */
#define S3C_PCM_CLKCTL_SERCLK_EN (0x1 << 19)
#define S3C_PCM_CLKCTL_SERCLKSEL_PCLK (0x1 << 18)
#define S3C_PCM_CLKCTL_SCLKDIV_MASK 0x1ff
#define S3C_PCM_CLKCTL_SYNCDIV_MASK 0x1ff
#define S3C_PCM_CLKCTL_SCLKDIV_SHIFT 9
#define S3C_PCM_CLKCTL_SYNCDIV_SHIFT 0
/* PCM_TXFIFO Bit-Fields */
#define S3C_PCM_TXFIFO_DVALID (0x1 << 16)
#define S3C_PCM_TXFIFO_DATA_MSK (0xffff << 0)
/* PCM_RXFIFO Bit-Fields */
#define S3C_PCM_RXFIFO_DVALID (0x1 << 16)
#define S3C_PCM_RXFIFO_DATA_MSK (0xffff << 0)
/* PCM_IRQCTL Bit-Fields */
#define S3C_PCM_IRQCTL_IRQEN (0x1 << 14)
#define S3C_PCM_IRQCTL_WRDEN (0x1 << 12)
#define S3C_PCM_IRQCTL_TXEMPTYEN (0x1 << 11)
#define S3C_PCM_IRQCTL_TXALMSTEMPTYEN (0x1 << 10)
#define S3C_PCM_IRQCTL_TXFULLEN (0x1 << 9)
#define S3C_PCM_IRQCTL_TXALMSTFULLEN (0x1 << 8)
#define S3C_PCM_IRQCTL_TXSTARVEN (0x1 << 7)
#define S3C_PCM_IRQCTL_TXERROVRFLEN (0x1 << 6)
#define S3C_PCM_IRQCTL_RXEMPTEN (0x1 << 5)
#define S3C_PCM_IRQCTL_RXALMSTEMPTEN (0x1 << 4)
#define S3C_PCM_IRQCTL_RXFULLEN (0x1 << 3)
#define S3C_PCM_IRQCTL_RXALMSTFULLEN (0x1 << 2)
#define S3C_PCM_IRQCTL_RXSTARVEN (0x1 << 1)
#define S3C_PCM_IRQCTL_RXERROVRFLEN (0x1 << 0)
/* PCM_IRQSTAT Bit-Fields */
#define S3C_PCM_IRQSTAT_IRQPND (0x1 << 13)
#define S3C_PCM_IRQSTAT_WRD_XFER (0x1 << 12)
#define S3C_PCM_IRQSTAT_TXEMPTY (0x1 << 11)
#define S3C_PCM_IRQSTAT_TXALMSTEMPTY (0x1 << 10)
#define S3C_PCM_IRQSTAT_TXFULL (0x1 << 9)
#define S3C_PCM_IRQSTAT_TXALMSTFULL (0x1 << 8)
#define S3C_PCM_IRQSTAT_TXSTARV (0x1 << 7)
#define S3C_PCM_IRQSTAT_TXERROVRFL (0x1 << 6)
#define S3C_PCM_IRQSTAT_RXEMPT (0x1 << 5)
#define S3C_PCM_IRQSTAT_RXALMSTEMPT (0x1 << 4)
#define S3C_PCM_IRQSTAT_RXFULL (0x1 << 3)
#define S3C_PCM_IRQSTAT_RXALMSTFULL (0x1 << 2)
#define S3C_PCM_IRQSTAT_RXSTARV (0x1 << 1)
#define S3C_PCM_IRQSTAT_RXERROVRFL (0x1 << 0)
/* PCM_FIFOSTAT Bit-Fields */
#define S3C_PCM_FIFOSTAT_TXCNT_MSK (0x3f << 14)
#define S3C_PCM_FIFOSTAT_TXFIFOEMPTY (0x1 << 13)
#define S3C_PCM_FIFOSTAT_TXFIFOALMSTEMPTY (0x1 << 12)
#define S3C_PCM_FIFOSTAT_TXFIFOFULL (0x1 << 11)
#define S3C_PCM_FIFOSTAT_TXFIFOALMSTFULL (0x1 << 10)
#define S3C_PCM_FIFOSTAT_RXCNT_MSK (0x3f << 4)
#define S3C_PCM_FIFOSTAT_RXFIFOEMPTY (0x1 << 3)
#define S3C_PCM_FIFOSTAT_RXFIFOALMSTEMPTY (0x1 << 2)
#define S3C_PCM_FIFOSTAT_RXFIFOFULL (0x1 << 1)
#define S3C_PCM_FIFOSTAT_RXFIFOALMSTFULL (0x1 << 0)
/**
* struct s3c_pcm_info - S3C PCM Controller information
* @dev: The parent device passed to use from the probe.
* @regs: The pointer to the device register block.
* @dma_playback: DMA information for playback channel.
* @dma_capture: DMA information for capture channel.
*/
struct s3c_pcm_info {
spinlock_t lock;
struct device *dev;
void __iomem *regs;
unsigned int sclk_per_fs;
/* Whether to keep PCMSCLK enabled even when idle(no active xfer) */
unsigned int idleclk;
struct clk *pclk;
struct clk *cclk;
struct snd_dmaengine_dai_dma_data *dma_playback;
struct snd_dmaengine_dai_dma_data *dma_capture;
};
static struct snd_dmaengine_dai_dma_data s3c_pcm_stereo_out[] = {
[0] = {
.addr_width = 4,
},
[1] = {
.addr_width = 4,
},
};
static struct snd_dmaengine_dai_dma_data s3c_pcm_stereo_in[] = {
[0] = {
.addr_width = 4,
},
[1] = {
.addr_width = 4,
},
};
static struct s3c_pcm_info s3c_pcm[2];
static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
{
void __iomem *regs = pcm->regs;
u32 ctl, clkctl;
clkctl = readl(regs + S3C_PCM_CLKCTL);
ctl = readl(regs + S3C_PCM_CTL);
ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
<< S3C_PCM_CTL_TXDIPSTICK_SHIFT);
if (on) {
ctl |= S3C_PCM_CTL_TXDMA_EN;
ctl |= S3C_PCM_CTL_TXFIFO_EN;
ctl |= S3C_PCM_CTL_ENABLE;
ctl |= (0x4<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
} else {
ctl &= ~S3C_PCM_CTL_TXDMA_EN;
ctl &= ~S3C_PCM_CTL_TXFIFO_EN;
if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
ctl &= ~S3C_PCM_CTL_ENABLE;
if (!pcm->idleclk)
clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
}
}
writel(clkctl, regs + S3C_PCM_CLKCTL);
writel(ctl, regs + S3C_PCM_CTL);
}
static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
{
void __iomem *regs = pcm->regs;
u32 ctl, clkctl;
ctl = readl(regs + S3C_PCM_CTL);
clkctl = readl(regs + S3C_PCM_CLKCTL);
ctl &= ~(S3C_PCM_CTL_RXDIPSTICK_MASK
<< S3C_PCM_CTL_RXDIPSTICK_SHIFT);
if (on) {
ctl |= S3C_PCM_CTL_RXDMA_EN;
ctl |= S3C_PCM_CTL_RXFIFO_EN;
ctl |= S3C_PCM_CTL_ENABLE;
ctl |= (0x20<<S3C_PCM_CTL_RXDIPSTICK_SHIFT);
clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
} else {
ctl &= ~S3C_PCM_CTL_RXDMA_EN;
ctl &= ~S3C_PCM_CTL_RXFIFO_EN;
if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
ctl &= ~S3C_PCM_CTL_ENABLE;
if (!pcm->idleclk)
clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
}
}
writel(clkctl, regs + S3C_PCM_CLKCTL);
writel(ctl, regs + S3C_PCM_CTL);
}
static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
unsigned long flags;
dev_dbg(pcm->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(&pcm->lock, flags);
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
s3c_pcm_snd_rxctrl(pcm, 1);
else
s3c_pcm_snd_txctrl(pcm, 1);
spin_unlock_irqrestore(&pcm->lock, flags);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
spin_lock_irqsave(&pcm->lock, flags);
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
s3c_pcm_snd_rxctrl(pcm, 0);
else
s3c_pcm_snd_txctrl(pcm, 0);
spin_unlock_irqrestore(&pcm->lock, flags);
break;
default:
return -EINVAL;
}
return 0;
}
static int s3c_pcm_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 s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
void __iomem *regs = pcm->regs;
struct clk *clk;
int sclk_div, sync_div;
unsigned long flags;
u32 clkctl;
dev_dbg(pcm->dev, "Entered %s\n", __func__);
/* Strictly check for sample size */
switch (params_width(params)) {
case 16:
break;
default:
return -EINVAL;
}
spin_lock_irqsave(&pcm->lock, flags);
/* Get hold of the PCMSOURCE_CLK */
clkctl = readl(regs + S3C_PCM_CLKCTL);
if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
clk = pcm->pclk;
else
clk = pcm->cclk;
/* Set the SCLK divider */
sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
params_rate(params) / 2 - 1;
clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
<< S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
<< S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
/* Set the SYNC divider */
sync_div = pcm->sclk_per_fs - 1;
clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
<< S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
<< S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
writel(clkctl, regs + S3C_PCM_CLKCTL);
spin_unlock_irqrestore(&pcm->lock, flags);
dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
clk_get_rate(clk), pcm->sclk_per_fs,
sclk_div, sync_div);
return 0;
}
static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
void __iomem *regs = pcm->regs;
unsigned long flags;
int ret = 0;
u32 ctl;
dev_dbg(pcm->dev, "Entered %s\n", __func__);
spin_lock_irqsave(&pcm->lock, flags);
ctl = readl(regs + S3C_PCM_CTL);
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_IB_NF:
/* Nothing to do, IB_NF by default */
break;
default:
dev_err(pcm->dev, "Unsupported clock inversion!\n");
ret = -EINVAL;
goto exit;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
/* Nothing to do, Master by default */
break;
default:
dev_err(pcm->dev, "Unsupported master/slave format!\n");
ret = -EINVAL;
goto exit;
}
switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
case SND_SOC_DAIFMT_CONT:
pcm->idleclk = 1;
break;
case SND_SOC_DAIFMT_GATED:
pcm->idleclk = 0;
break;
default:
dev_err(pcm->dev, "Invalid Clock gating request!\n");
ret = -EINVAL;
goto exit;
}
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_DSP_A:
ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
break;
case SND_SOC_DAIFMT_DSP_B:
ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
break;
default:
dev_err(pcm->dev, "Unsupported data format!\n");
ret = -EINVAL;
goto exit;
}
writel(ctl, regs + S3C_PCM_CTL);
exit:
spin_unlock_irqrestore(&pcm->lock, flags);
return ret;
}
static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
int div_id, int div)
{
struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
switch (div_id) {
case S3C_PCM_SCLK_PER_FS:
pcm->sclk_per_fs = div;
break;
default:
return -EINVAL;
}
return 0;
}
static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir)
{
struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
void __iomem *regs = pcm->regs;
u32 clkctl = readl(regs + S3C_PCM_CLKCTL);
switch (clk_id) {
case S3C_PCM_CLKSRC_PCLK:
clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
break;
case S3C_PCM_CLKSRC_MUX:
clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
if (clk_get_rate(pcm->cclk) != freq)
clk_set_rate(pcm->cclk, freq);
break;
default:
return -EINVAL;
}
writel(clkctl, regs + S3C_PCM_CLKCTL);
return 0;
}
static const struct snd_soc_dai_ops s3c_pcm_dai_ops = {
.set_sysclk = s3c_pcm_set_sysclk,
.set_clkdiv = s3c_pcm_set_clkdiv,
.trigger = s3c_pcm_trigger,
.hw_params = s3c_pcm_hw_params,
.set_fmt = s3c_pcm_set_fmt,
};
static int s3c_pcm_dai_probe(struct snd_soc_dai *dai)
{
struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_init_dma_data(dai, pcm->dma_playback, pcm->dma_capture);
return 0;
}
#define S3C_PCM_RATES SNDRV_PCM_RATE_8000_96000
#define S3C_PCM_DAI_DECLARE \
.symmetric_rates = 1, \
.probe = s3c_pcm_dai_probe, \
.ops = &s3c_pcm_dai_ops, \
.playback = { \
.channels_min = 2, \
.channels_max = 2, \
.rates = S3C_PCM_RATES, \
.formats = SNDRV_PCM_FMTBIT_S16_LE, \
}, \
.capture = { \
.channels_min = 2, \
.channels_max = 2, \
.rates = S3C_PCM_RATES, \
.formats = SNDRV_PCM_FMTBIT_S16_LE, \
}
static struct snd_soc_dai_driver s3c_pcm_dai[] = {
[0] = {
.name = "samsung-pcm.0",
S3C_PCM_DAI_DECLARE,
},
[1] = {
.name = "samsung-pcm.1",
S3C_PCM_DAI_DECLARE,
},
};
static const struct snd_soc_component_driver s3c_pcm_component = {
.name = "s3c-pcm",
};
static int s3c_pcm_dev_probe(struct platform_device *pdev)
{
struct s3c_pcm_info *pcm;
struct resource *mem_res;
struct s3c_audio_pdata *pcm_pdata;
dma_filter_fn filter;
int ret;
/* Check for valid device index */
if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) {
dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
return -EINVAL;
}
pcm_pdata = pdev->dev.platform_data;
/* Check for availability of necessary resource */
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 (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
dev_err(&pdev->dev, "Unable to configure gpio\n");
return -EINVAL;
}
pcm = &s3c_pcm[pdev->id];
pcm->dev = &pdev->dev;
spin_lock_init(&pcm->lock);
/* Default is 128fs */
pcm->sclk_per_fs = 128;
pcm->cclk = devm_clk_get(&pdev->dev, "audio-bus");
if (IS_ERR(pcm->cclk)) {
dev_err(&pdev->dev, "failed to get audio-bus\n");
ret = PTR_ERR(pcm->cclk);
goto err1;
}
clk_prepare_enable(pcm->cclk);
/* record our pcm structure for later use in the callbacks */
dev_set_drvdata(&pdev->dev, pcm);
if (!request_mem_region(mem_res->start,
resource_size(mem_res), "samsung-pcm")) {
dev_err(&pdev->dev, "Unable to request register region\n");
ret = -EBUSY;
goto err2;
}
pcm->regs = ioremap(mem_res->start, 0x100);
if (pcm->regs == NULL) {
dev_err(&pdev->dev, "cannot ioremap registers\n");
ret = -ENXIO;
goto err3;
}
pcm->pclk = devm_clk_get(&pdev->dev, "pcm");
if (IS_ERR(pcm->pclk)) {
dev_err(&pdev->dev, "failed to get pcm_clock\n");
ret = -ENOENT;
goto err4;
}
clk_prepare_enable(pcm->pclk);
s3c_pcm_stereo_in[pdev->id].addr = mem_res->start + S3C_PCM_RXFIFO;
s3c_pcm_stereo_out[pdev->id].addr = mem_res->start + S3C_PCM_TXFIFO;
filter = NULL;
if (pcm_pdata) {
s3c_pcm_stereo_in[pdev->id].filter_data = pcm_pdata->dma_capture;
s3c_pcm_stereo_out[pdev->id].filter_data = pcm_pdata->dma_playback;
filter = pcm_pdata->dma_filter;
}
pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];
ret = samsung_asoc_dma_platform_register(&pdev->dev, filter,
NULL, NULL);
if (ret) {
dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret);
goto err5;
}
pm_runtime_enable(&pdev->dev);
ret = devm_snd_soc_register_component(&pdev->dev, &s3c_pcm_component,
&s3c_pcm_dai[pdev->id], 1);
if (ret != 0) {
dev_err(&pdev->dev, "failed to get register DAI: %d\n", ret);
goto err6;
}
return 0;
err6:
pm_runtime_disable(&pdev->dev);
err5:
clk_disable_unprepare(pcm->pclk);
err4:
iounmap(pcm->regs);
err3:
release_mem_region(mem_res->start, resource_size(mem_res));
err2:
clk_disable_unprepare(pcm->cclk);
err1:
return ret;
}
static int s3c_pcm_dev_remove(struct platform_device *pdev)
{
struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
struct resource *mem_res;
pm_runtime_disable(&pdev->dev);
iounmap(pcm->regs);
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(mem_res->start, resource_size(mem_res));
clk_disable_unprepare(pcm->cclk);
clk_disable_unprepare(pcm->pclk);
return 0;
}
static struct platform_driver s3c_pcm_driver = {
.probe = s3c_pcm_dev_probe,
.remove = s3c_pcm_dev_remove,
.driver = {
.name = "samsung-pcm",
},
};
module_platform_driver(s3c_pcm_driver);
/* Module information */
MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
MODULE_DESCRIPTION("S3C PCM Controller Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:samsung-pcm");
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