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linux/sound/soc/samsung/i2s.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

1546 lines
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/* sound/soc/samsung/i2s.c
*
* ALSA SoC Audio Layer - Samsung I2S Controller driver
*
* Copyright (c) 2010 Samsung Electronics Co. Ltd.
* Jaswinder Singh <jassisinghbrar@gmail.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 <dt-bindings/sound/samsung-i2s.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_gpio.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 "idma.h"
#include "i2s.h"
#include "i2s-regs.h"
#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
enum samsung_dai_type {
TYPE_PRI,
TYPE_SEC,
};
struct samsung_i2s_variant_regs {
unsigned int bfs_off;
unsigned int rfs_off;
unsigned int sdf_off;
unsigned int txr_off;
unsigned int rclksrc_off;
unsigned int mss_off;
unsigned int cdclkcon_off;
unsigned int lrp_off;
unsigned int bfs_mask;
unsigned int rfs_mask;
unsigned int ftx0cnt_off;
};
struct samsung_i2s_dai_data {
int dai_type;
u32 quirks;
const struct samsung_i2s_variant_regs *i2s_variant_regs;
};
struct i2s_dai {
/* Platform device for this DAI */
struct platform_device *pdev;
/* Memory mapped SFR region */
void __iomem *addr;
/* Rate of RCLK source clock */
unsigned long rclk_srcrate;
/* Frame Clock */
unsigned frmclk;
/*
* Specifically requested RCLK,BCLK by MACHINE Driver.
* 0 indicates CPU driver is free to choose any value.
*/
unsigned rfs, bfs;
/* I2S Controller's core clock */
struct clk *clk;
/* Clock for generating I2S signals */
struct clk *op_clk;
/* Pointer to the Primary_Fifo if this is Sec_Fifo, NULL otherwise */
struct i2s_dai *pri_dai;
/* Pointer to the Secondary_Fifo if it has one, NULL otherwise */
struct i2s_dai *sec_dai;
#define DAI_OPENED (1 << 0) /* Dai is opened */
#define DAI_MANAGER (1 << 1) /* Dai is the manager */
unsigned mode;
/* Driver for this DAI */
struct snd_soc_dai_driver i2s_dai_drv;
/* DMA parameters */
struct s3c_dma_params dma_playback;
struct s3c_dma_params dma_capture;
struct s3c_dma_params idma_playback;
dma_filter_fn filter;
u32 quirks;
u32 suspend_i2smod;
u32 suspend_i2scon;
u32 suspend_i2spsr;
const struct samsung_i2s_variant_regs *variant_regs;
/* Spinlock protecting access to the device's registers */
spinlock_t spinlock;
spinlock_t *lock;
/* Below fields are only valid if this is the primary FIFO */
struct clk *clk_table[3];
struct clk_onecell_data clk_data;
};
/* Lock for cross i/f checks */
static DEFINE_SPINLOCK(lock);
/* If this is the 'overlay' stereo DAI */
static inline bool is_secondary(struct i2s_dai *i2s)
{
return i2s->pri_dai ? true : false;
}
/* If operating in SoC-Slave mode */
static inline bool is_slave(struct i2s_dai *i2s)
{
u32 mod = readl(i2s->addr + I2SMOD);
return (mod & (1 << i2s->variant_regs->mss_off)) ? true : false;
}
/* If this interface of the controller is transmitting data */
static inline bool tx_active(struct i2s_dai *i2s)
{
u32 active;
if (!i2s)
return false;
active = readl(i2s->addr + I2SCON);
if (is_secondary(i2s))
active &= CON_TXSDMA_ACTIVE;
else
active &= CON_TXDMA_ACTIVE;
return active ? true : false;
}
/* Return pointer to the other DAI */
static inline struct i2s_dai *get_other_dai(struct i2s_dai *i2s)
{
return i2s->pri_dai ? : i2s->sec_dai;
}
/* If the other interface of the controller is transmitting data */
static inline bool other_tx_active(struct i2s_dai *i2s)
{
struct i2s_dai *other = get_other_dai(i2s);
return tx_active(other);
}
/* If any interface of the controller is transmitting data */
static inline bool any_tx_active(struct i2s_dai *i2s)
{
return tx_active(i2s) || other_tx_active(i2s);
}
/* If this interface of the controller is receiving data */
static inline bool rx_active(struct i2s_dai *i2s)
{
u32 active;
if (!i2s)
return false;
active = readl(i2s->addr + I2SCON) & CON_RXDMA_ACTIVE;
return active ? true : false;
}
/* If the other interface of the controller is receiving data */
static inline bool other_rx_active(struct i2s_dai *i2s)
{
struct i2s_dai *other = get_other_dai(i2s);
return rx_active(other);
}
/* If any interface of the controller is receiving data */
static inline bool any_rx_active(struct i2s_dai *i2s)
{
return rx_active(i2s) || other_rx_active(i2s);
}
/* If the other DAI is transmitting or receiving data */
static inline bool other_active(struct i2s_dai *i2s)
{
return other_rx_active(i2s) || other_tx_active(i2s);
}
/* If this DAI is transmitting or receiving data */
static inline bool this_active(struct i2s_dai *i2s)
{
return tx_active(i2s) || rx_active(i2s);
}
/* If the controller is active anyway */
static inline bool any_active(struct i2s_dai *i2s)
{
return this_active(i2s) || other_active(i2s);
}
static inline struct i2s_dai *to_info(struct snd_soc_dai *dai)
{
return snd_soc_dai_get_drvdata(dai);
}
static inline bool is_opened(struct i2s_dai *i2s)
{
if (i2s && (i2s->mode & DAI_OPENED))
return true;
else
return false;
}
static inline bool is_manager(struct i2s_dai *i2s)
{
if (is_opened(i2s) && (i2s->mode & DAI_MANAGER))
return true;
else
return false;
}
/* Read RCLK of I2S (in multiples of LRCLK) */
static inline unsigned get_rfs(struct i2s_dai *i2s)
{
u32 rfs;
rfs = readl(i2s->addr + I2SMOD) >> i2s->variant_regs->rfs_off;
rfs &= i2s->variant_regs->rfs_mask;
switch (rfs) {
case 7: return 192;
case 6: return 96;
case 5: return 128;
case 4: return 64;
case 3: return 768;
case 2: return 384;
case 1: return 512;
default: return 256;
}
}
/* Write RCLK of I2S (in multiples of LRCLK) */
static inline void set_rfs(struct i2s_dai *i2s, unsigned rfs)
{
u32 mod = readl(i2s->addr + I2SMOD);
int rfs_shift = i2s->variant_regs->rfs_off;
mod &= ~(i2s->variant_regs->rfs_mask << rfs_shift);
switch (rfs) {
case 192:
mod |= (EXYNOS7_MOD_RCLK_192FS << rfs_shift);
break;
case 96:
mod |= (EXYNOS7_MOD_RCLK_96FS << rfs_shift);
break;
case 128:
mod |= (EXYNOS7_MOD_RCLK_128FS << rfs_shift);
break;
case 64:
mod |= (EXYNOS7_MOD_RCLK_64FS << rfs_shift);
break;
case 768:
mod |= (MOD_RCLK_768FS << rfs_shift);
break;
case 512:
mod |= (MOD_RCLK_512FS << rfs_shift);
break;
case 384:
mod |= (MOD_RCLK_384FS << rfs_shift);
break;
default:
mod |= (MOD_RCLK_256FS << rfs_shift);
break;
}
writel(mod, i2s->addr + I2SMOD);
}
/* Read Bit-Clock of I2S (in multiples of LRCLK) */
static inline unsigned get_bfs(struct i2s_dai *i2s)
{
u32 bfs;
bfs = readl(i2s->addr + I2SMOD) >> i2s->variant_regs->bfs_off;
bfs &= i2s->variant_regs->bfs_mask;
switch (bfs) {
case 8: return 256;
case 7: return 192;
case 6: return 128;
case 5: return 96;
case 4: return 64;
case 3: return 24;
case 2: return 16;
case 1: return 48;
default: return 32;
}
}
/* Write Bit-Clock of I2S (in multiples of LRCLK) */
static inline void set_bfs(struct i2s_dai *i2s, unsigned bfs)
{
u32 mod = readl(i2s->addr + I2SMOD);
int tdm = i2s->quirks & QUIRK_SUPPORTS_TDM;
int bfs_shift = i2s->variant_regs->bfs_off;
/* Non-TDM I2S controllers do not support BCLK > 48 * FS */
if (!tdm && bfs > 48) {
dev_err(&i2s->pdev->dev, "Unsupported BCLK divider\n");
return;
}
mod &= ~(i2s->variant_regs->bfs_mask << bfs_shift);
switch (bfs) {
case 48:
mod |= (MOD_BCLK_48FS << bfs_shift);
break;
case 32:
mod |= (MOD_BCLK_32FS << bfs_shift);
break;
case 24:
mod |= (MOD_BCLK_24FS << bfs_shift);
break;
case 16:
mod |= (MOD_BCLK_16FS << bfs_shift);
break;
case 64:
mod |= (EXYNOS5420_MOD_BCLK_64FS << bfs_shift);
break;
case 96:
mod |= (EXYNOS5420_MOD_BCLK_96FS << bfs_shift);
break;
case 128:
mod |= (EXYNOS5420_MOD_BCLK_128FS << bfs_shift);
break;
case 192:
mod |= (EXYNOS5420_MOD_BCLK_192FS << bfs_shift);
break;
case 256:
mod |= (EXYNOS5420_MOD_BCLK_256FS << bfs_shift);
break;
default:
dev_err(&i2s->pdev->dev, "Wrong BCLK Divider!\n");
return;
}
writel(mod, i2s->addr + I2SMOD);
}
/* Sample-Size */
static inline int get_blc(struct i2s_dai *i2s)
{
int blc = readl(i2s->addr + I2SMOD);
blc = (blc >> 13) & 0x3;
switch (blc) {
case 2: return 24;
case 1: return 8;
default: return 16;
}
}
/* TX Channel Control */
static void i2s_txctrl(struct i2s_dai *i2s, int on)
{
void __iomem *addr = i2s->addr;
int txr_off = i2s->variant_regs->txr_off;
u32 con = readl(addr + I2SCON);
u32 mod = readl(addr + I2SMOD) & ~(3 << txr_off);
if (on) {
con |= CON_ACTIVE;
con &= ~CON_TXCH_PAUSE;
if (is_secondary(i2s)) {
con |= CON_TXSDMA_ACTIVE;
con &= ~CON_TXSDMA_PAUSE;
} else {
con |= CON_TXDMA_ACTIVE;
con &= ~CON_TXDMA_PAUSE;
}
if (any_rx_active(i2s))
mod |= 2 << txr_off;
else
mod |= 0 << txr_off;
} else {
if (is_secondary(i2s)) {
con |= CON_TXSDMA_PAUSE;
con &= ~CON_TXSDMA_ACTIVE;
} else {
con |= CON_TXDMA_PAUSE;
con &= ~CON_TXDMA_ACTIVE;
}
if (other_tx_active(i2s)) {
writel(con, addr + I2SCON);
return;
}
con |= CON_TXCH_PAUSE;
if (any_rx_active(i2s))
mod |= 1 << txr_off;
else
con &= ~CON_ACTIVE;
}
writel(mod, addr + I2SMOD);
writel(con, addr + I2SCON);
}
/* RX Channel Control */
static void i2s_rxctrl(struct i2s_dai *i2s, int on)
{
void __iomem *addr = i2s->addr;
int txr_off = i2s->variant_regs->txr_off;
u32 con = readl(addr + I2SCON);
u32 mod = readl(addr + I2SMOD) & ~(3 << txr_off);
if (on) {
con |= CON_RXDMA_ACTIVE | CON_ACTIVE;
con &= ~(CON_RXDMA_PAUSE | CON_RXCH_PAUSE);
if (any_tx_active(i2s))
mod |= 2 << txr_off;
else
mod |= 1 << txr_off;
} else {
con |= CON_RXDMA_PAUSE | CON_RXCH_PAUSE;
con &= ~CON_RXDMA_ACTIVE;
if (any_tx_active(i2s))
mod |= 0 << txr_off;
else
con &= ~CON_ACTIVE;
}
writel(mod, addr + I2SMOD);
writel(con, addr + I2SCON);
}
/* Flush FIFO of an interface */
static inline void i2s_fifo(struct i2s_dai *i2s, u32 flush)
{
void __iomem *fic;
u32 val;
if (!i2s)
return;
if (is_secondary(i2s))
fic = i2s->addr + I2SFICS;
else
fic = i2s->addr + I2SFIC;
/* Flush the FIFO */
writel(readl(fic) | flush, fic);
/* Be patient */
val = msecs_to_loops(1) / 1000; /* 1 usec */
while (--val)
cpu_relax();
writel(readl(fic) & ~flush, fic);
}
static int i2s_set_sysclk(struct snd_soc_dai *dai,
int clk_id, unsigned int rfs, int dir)
{
struct i2s_dai *i2s = to_info(dai);
struct i2s_dai *other = get_other_dai(i2s);
const struct samsung_i2s_variant_regs *i2s_regs = i2s->variant_regs;
unsigned int cdcon_mask = 1 << i2s_regs->cdclkcon_off;
unsigned int rsrc_mask = 1 << i2s_regs->rclksrc_off;
u32 mod, mask, val = 0;
spin_lock(i2s->lock);
mod = readl(i2s->addr + I2SMOD);
spin_unlock(i2s->lock);
switch (clk_id) {
case SAMSUNG_I2S_OPCLK:
mask = MOD_OPCLK_MASK;
val = dir;
break;
case SAMSUNG_I2S_CDCLK:
mask = 1 << i2s_regs->cdclkcon_off;
/* Shouldn't matter in GATING(CLOCK_IN) mode */
if (dir == SND_SOC_CLOCK_IN)
rfs = 0;
if ((rfs && other && other->rfs && (other->rfs != rfs)) ||
(any_active(i2s) &&
(((dir == SND_SOC_CLOCK_IN)
&& !(mod & cdcon_mask)) ||
((dir == SND_SOC_CLOCK_OUT)
&& (mod & cdcon_mask))))) {
dev_err(&i2s->pdev->dev,
"%s:%d Other DAI busy\n", __func__, __LINE__);
return -EAGAIN;
}
if (dir == SND_SOC_CLOCK_IN)
val = 1 << i2s_regs->cdclkcon_off;
i2s->rfs = rfs;
break;
case SAMSUNG_I2S_RCLKSRC_0: /* clock corrsponding to IISMOD[10] := 0 */
case SAMSUNG_I2S_RCLKSRC_1: /* clock corrsponding to IISMOD[10] := 1 */
mask = 1 << i2s_regs->rclksrc_off;
if ((i2s->quirks & QUIRK_NO_MUXPSR)
|| (clk_id == SAMSUNG_I2S_RCLKSRC_0))
clk_id = 0;
else
clk_id = 1;
if (!any_active(i2s)) {
if (i2s->op_clk && !IS_ERR(i2s->op_clk)) {
if ((clk_id && !(mod & rsrc_mask)) ||
(!clk_id && (mod & rsrc_mask))) {
clk_disable_unprepare(i2s->op_clk);
clk_put(i2s->op_clk);
} else {
i2s->rclk_srcrate =
clk_get_rate(i2s->op_clk);
return 0;
}
}
if (clk_id)
i2s->op_clk = clk_get(&i2s->pdev->dev,
"i2s_opclk1");
else
i2s->op_clk = clk_get(&i2s->pdev->dev,
"i2s_opclk0");
if (WARN_ON(IS_ERR(i2s->op_clk)))
return PTR_ERR(i2s->op_clk);
clk_prepare_enable(i2s->op_clk);
i2s->rclk_srcrate = clk_get_rate(i2s->op_clk);
/* Over-ride the other's */
if (other) {
other->op_clk = i2s->op_clk;
other->rclk_srcrate = i2s->rclk_srcrate;
}
} else if ((!clk_id && (mod & rsrc_mask))
|| (clk_id && !(mod & rsrc_mask))) {
dev_err(&i2s->pdev->dev,
"%s:%d Other DAI busy\n", __func__, __LINE__);
return -EAGAIN;
} else {
/* Call can't be on the active DAI */
i2s->op_clk = other->op_clk;
i2s->rclk_srcrate = other->rclk_srcrate;
return 0;
}
if (clk_id == 1)
val = 1 << i2s_regs->rclksrc_off;
break;
default:
dev_err(&i2s->pdev->dev, "We don't serve that!\n");
return -EINVAL;
}
spin_lock(i2s->lock);
mod = readl(i2s->addr + I2SMOD);
mod = (mod & ~mask) | val;
writel(mod, i2s->addr + I2SMOD);
spin_unlock(i2s->lock);
return 0;
}
static int i2s_set_fmt(struct snd_soc_dai *dai,
unsigned int fmt)
{
struct i2s_dai *i2s = to_info(dai);
int lrp_shift, sdf_shift, sdf_mask, lrp_rlow, mod_slave;
u32 mod, tmp = 0;
lrp_shift = i2s->variant_regs->lrp_off;
sdf_shift = i2s->variant_regs->sdf_off;
mod_slave = 1 << i2s->variant_regs->mss_off;
sdf_mask = MOD_SDF_MASK << sdf_shift;
lrp_rlow = MOD_LR_RLOW << lrp_shift;
/* Format is priority */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_RIGHT_J:
tmp |= lrp_rlow;
tmp |= (MOD_SDF_MSB << sdf_shift);
break;
case SND_SOC_DAIFMT_LEFT_J:
tmp |= lrp_rlow;
tmp |= (MOD_SDF_LSB << sdf_shift);
break;
case SND_SOC_DAIFMT_I2S:
tmp |= (MOD_SDF_IIS << sdf_shift);
break;
default:
dev_err(&i2s->pdev->dev, "Format not supported\n");
return -EINVAL;
}
/*
* INV flag is relative to the FORMAT flag - if set it simply
* flips the polarity specified by the Standard
*/
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
break;
case SND_SOC_DAIFMT_NB_IF:
if (tmp & lrp_rlow)
tmp &= ~lrp_rlow;
else
tmp |= lrp_rlow;
break;
default:
dev_err(&i2s->pdev->dev, "Polarity not supported\n");
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
tmp |= mod_slave;
break;
case SND_SOC_DAIFMT_CBS_CFS:
/* Set default source clock in Master mode */
if (i2s->rclk_srcrate == 0)
i2s_set_sysclk(dai, SAMSUNG_I2S_RCLKSRC_0,
0, SND_SOC_CLOCK_IN);
break;
default:
dev_err(&i2s->pdev->dev, "master/slave format not supported\n");
return -EINVAL;
}
spin_lock(i2s->lock);
mod = readl(i2s->addr + I2SMOD);
/*
* Don't change the I2S mode if any controller is active on this
* channel.
*/
if (any_active(i2s) &&
((mod & (sdf_mask | lrp_rlow | mod_slave)) != tmp)) {
spin_unlock(i2s->lock);
dev_err(&i2s->pdev->dev,
"%s:%d Other DAI busy\n", __func__, __LINE__);
return -EAGAIN;
}
mod &= ~(sdf_mask | lrp_rlow | mod_slave);
mod |= tmp;
writel(mod, i2s->addr + I2SMOD);
spin_unlock(i2s->lock);
return 0;
}
static int i2s_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
struct i2s_dai *i2s = to_info(dai);
u32 mod, mask = 0, val = 0;
if (!is_secondary(i2s))
mask |= (MOD_DC2_EN | MOD_DC1_EN);
switch (params_channels(params)) {
case 6:
val |= MOD_DC2_EN;
case 4:
val |= MOD_DC1_EN;
break;
case 2:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
i2s->dma_playback.dma_size = 4;
else
i2s->dma_capture.dma_size = 4;
break;
case 1:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
i2s->dma_playback.dma_size = 2;
else
i2s->dma_capture.dma_size = 2;
break;
default:
dev_err(&i2s->pdev->dev, "%d channels not supported\n",
params_channels(params));
return -EINVAL;
}
if (is_secondary(i2s))
mask |= MOD_BLCS_MASK;
else
mask |= MOD_BLCP_MASK;
if (is_manager(i2s))
mask |= MOD_BLC_MASK;
switch (params_width(params)) {
case 8:
if (is_secondary(i2s))
val |= MOD_BLCS_8BIT;
else
val |= MOD_BLCP_8BIT;
if (is_manager(i2s))
val |= MOD_BLC_8BIT;
break;
case 16:
if (is_secondary(i2s))
val |= MOD_BLCS_16BIT;
else
val |= MOD_BLCP_16BIT;
if (is_manager(i2s))
val |= MOD_BLC_16BIT;
break;
case 24:
if (is_secondary(i2s))
val |= MOD_BLCS_24BIT;
else
val |= MOD_BLCP_24BIT;
if (is_manager(i2s))
val |= MOD_BLC_24BIT;
break;
default:
dev_err(&i2s->pdev->dev, "Format(%d) not supported\n",
params_format(params));
return -EINVAL;
}
spin_lock(i2s->lock);
mod = readl(i2s->addr + I2SMOD);
mod = (mod & ~mask) | val;
writel(mod, i2s->addr + I2SMOD);
spin_unlock(i2s->lock);
samsung_asoc_init_dma_data(dai, &i2s->dma_playback, &i2s->dma_capture);
i2s->frmclk = params_rate(params);
return 0;
}
/* We set constraints on the substream acc to the version of I2S */
static int i2s_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct i2s_dai *i2s = to_info(dai);
struct i2s_dai *other = get_other_dai(i2s);
unsigned long flags;
spin_lock_irqsave(&lock, flags);
i2s->mode |= DAI_OPENED;
if (is_manager(other))
i2s->mode &= ~DAI_MANAGER;
else
i2s->mode |= DAI_MANAGER;
if (!any_active(i2s) && (i2s->quirks & QUIRK_NEED_RSTCLR))
writel(CON_RSTCLR, i2s->addr + I2SCON);
spin_unlock_irqrestore(&lock, flags);
return 0;
}
static void i2s_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct i2s_dai *i2s = to_info(dai);
struct i2s_dai *other = get_other_dai(i2s);
unsigned long flags;
spin_lock_irqsave(&lock, flags);
i2s->mode &= ~DAI_OPENED;
i2s->mode &= ~DAI_MANAGER;
if (is_opened(other))
other->mode |= DAI_MANAGER;
/* Reset any constraint on RFS and BFS */
i2s->rfs = 0;
i2s->bfs = 0;
spin_unlock_irqrestore(&lock, flags);
}
static int config_setup(struct i2s_dai *i2s)
{
struct i2s_dai *other = get_other_dai(i2s);
unsigned rfs, bfs, blc;
u32 psr;
blc = get_blc(i2s);
bfs = i2s->bfs;
if (!bfs && other)
bfs = other->bfs;
/* Select least possible multiple(2) if no constraint set */
if (!bfs)
bfs = blc * 2;
rfs = i2s->rfs;
if (!rfs && other)
rfs = other->rfs;
if ((rfs == 256 || rfs == 512) && (blc == 24)) {
dev_err(&i2s->pdev->dev,
"%d-RFS not supported for 24-blc\n", rfs);
return -EINVAL;
}
if (!rfs) {
if (bfs == 16 || bfs == 32)
rfs = 256;
else
rfs = 384;
}
/* If already setup and running */
if (any_active(i2s) && (get_rfs(i2s) != rfs || get_bfs(i2s) != bfs)) {
dev_err(&i2s->pdev->dev,
"%s:%d Other DAI busy\n", __func__, __LINE__);
return -EAGAIN;
}
set_bfs(i2s, bfs);
set_rfs(i2s, rfs);
/* Don't bother with PSR in Slave mode */
if (is_slave(i2s))
return 0;
if (!(i2s->quirks & QUIRK_NO_MUXPSR)) {
psr = i2s->rclk_srcrate / i2s->frmclk / rfs;
writel(((psr - 1) << 8) | PSR_PSREN, i2s->addr + I2SPSR);
dev_dbg(&i2s->pdev->dev,
"RCLK_SRC=%luHz PSR=%u, RCLK=%dfs, BCLK=%dfs\n",
i2s->rclk_srcrate, psr, rfs, bfs);
}
return 0;
}
static int i2s_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *dai)
{
int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct i2s_dai *i2s = to_info(rtd->cpu_dai);
unsigned long flags;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
spin_lock_irqsave(i2s->lock, flags);
if (config_setup(i2s)) {
spin_unlock_irqrestore(i2s->lock, flags);
return -EINVAL;
}
if (capture)
i2s_rxctrl(i2s, 1);
else
i2s_txctrl(i2s, 1);
spin_unlock_irqrestore(i2s->lock, flags);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
spin_lock_irqsave(i2s->lock, flags);
if (capture) {
i2s_rxctrl(i2s, 0);
i2s_fifo(i2s, FIC_RXFLUSH);
} else {
i2s_txctrl(i2s, 0);
i2s_fifo(i2s, FIC_TXFLUSH);
}
spin_unlock_irqrestore(i2s->lock, flags);
break;
}
return 0;
}
static int i2s_set_clkdiv(struct snd_soc_dai *dai,
int div_id, int div)
{
struct i2s_dai *i2s = to_info(dai);
struct i2s_dai *other = get_other_dai(i2s);
switch (div_id) {
case SAMSUNG_I2S_DIV_BCLK:
if ((any_active(i2s) && div && (get_bfs(i2s) != div))
|| (other && other->bfs && (other->bfs != div))) {
dev_err(&i2s->pdev->dev,
"%s:%d Other DAI busy\n", __func__, __LINE__);
return -EAGAIN;
}
i2s->bfs = div;
break;
default:
dev_err(&i2s->pdev->dev,
"Invalid clock divider(%d)\n", div_id);
return -EINVAL;
}
return 0;
}
static snd_pcm_sframes_t
i2s_delay(struct snd_pcm_substream *substream, struct snd_soc_dai *dai)
{
struct i2s_dai *i2s = to_info(dai);
u32 reg = readl(i2s->addr + I2SFIC);
snd_pcm_sframes_t delay;
const struct samsung_i2s_variant_regs *i2s_regs = i2s->variant_regs;
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
delay = FIC_RXCOUNT(reg);
else if (is_secondary(i2s))
delay = FICS_TXCOUNT(readl(i2s->addr + I2SFICS));
else
delay = (reg >> i2s_regs->ftx0cnt_off) & 0x7f;
return delay;
}
#ifdef CONFIG_PM
static int i2s_suspend(struct snd_soc_dai *dai)
{
struct i2s_dai *i2s = to_info(dai);
i2s->suspend_i2smod = readl(i2s->addr + I2SMOD);
i2s->suspend_i2scon = readl(i2s->addr + I2SCON);
i2s->suspend_i2spsr = readl(i2s->addr + I2SPSR);
return 0;
}
static int i2s_resume(struct snd_soc_dai *dai)
{
struct i2s_dai *i2s = to_info(dai);
writel(i2s->suspend_i2scon, i2s->addr + I2SCON);
writel(i2s->suspend_i2smod, i2s->addr + I2SMOD);
writel(i2s->suspend_i2spsr, i2s->addr + I2SPSR);
return 0;
}
#else
#define i2s_suspend NULL
#define i2s_resume NULL
#endif
static int samsung_i2s_dai_probe(struct snd_soc_dai *dai)
{
struct i2s_dai *i2s = to_info(dai);
struct i2s_dai *other = get_other_dai(i2s);
unsigned long flags;
if (is_secondary(i2s)) { /* If this is probe on the secondary DAI */
samsung_asoc_init_dma_data(dai, &other->sec_dai->dma_playback,
NULL);
} else {
samsung_asoc_init_dma_data(dai, &i2s->dma_playback,
&i2s->dma_capture);
if (i2s->quirks & QUIRK_NEED_RSTCLR)
writel(CON_RSTCLR, i2s->addr + I2SCON);
if (i2s->quirks & QUIRK_SUPPORTS_IDMA)
idma_reg_addr_init(i2s->addr,
i2s->sec_dai->idma_playback.dma_addr);
}
/* Reset any constraint on RFS and BFS */
i2s->rfs = 0;
i2s->bfs = 0;
i2s->rclk_srcrate = 0;
spin_lock_irqsave(i2s->lock, flags);
i2s_txctrl(i2s, 0);
i2s_rxctrl(i2s, 0);
i2s_fifo(i2s, FIC_TXFLUSH);
i2s_fifo(other, FIC_TXFLUSH);
i2s_fifo(i2s, FIC_RXFLUSH);
spin_unlock_irqrestore(i2s->lock, flags);
/* Gate CDCLK by default */
if (!is_opened(other))
i2s_set_sysclk(dai, SAMSUNG_I2S_CDCLK,
0, SND_SOC_CLOCK_IN);
return 0;
}
static int samsung_i2s_dai_remove(struct snd_soc_dai *dai)
{
struct i2s_dai *i2s = snd_soc_dai_get_drvdata(dai);
if (!is_secondary(i2s)) {
if (i2s->quirks & QUIRK_NEED_RSTCLR) {
spin_lock(i2s->lock);
writel(0, i2s->addr + I2SCON);
spin_unlock(i2s->lock);
}
}
return 0;
}
static const struct snd_soc_dai_ops samsung_i2s_dai_ops = {
.trigger = i2s_trigger,
.hw_params = i2s_hw_params,
.set_fmt = i2s_set_fmt,
.set_clkdiv = i2s_set_clkdiv,
.set_sysclk = i2s_set_sysclk,
.startup = i2s_startup,
.shutdown = i2s_shutdown,
.delay = i2s_delay,
};
static const struct snd_soc_component_driver samsung_i2s_component = {
.name = "samsung-i2s",
};
#define SAMSUNG_I2S_RATES SNDRV_PCM_RATE_8000_96000
#define SAMSUNG_I2S_FMTS (SNDRV_PCM_FMTBIT_S8 | \
SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_S24_LE)
static struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev, bool sec)
{
struct i2s_dai *i2s;
int ret;
i2s = devm_kzalloc(&pdev->dev, sizeof(struct i2s_dai), GFP_KERNEL);
if (i2s == NULL)
return NULL;
i2s->pdev = pdev;
i2s->pri_dai = NULL;
i2s->sec_dai = NULL;
i2s->i2s_dai_drv.symmetric_rates = 1;
i2s->i2s_dai_drv.probe = samsung_i2s_dai_probe;
i2s->i2s_dai_drv.remove = samsung_i2s_dai_remove;
i2s->i2s_dai_drv.ops = &samsung_i2s_dai_ops;
i2s->i2s_dai_drv.suspend = i2s_suspend;
i2s->i2s_dai_drv.resume = i2s_resume;
i2s->i2s_dai_drv.playback.channels_min = 1;
i2s->i2s_dai_drv.playback.channels_max = 2;
i2s->i2s_dai_drv.playback.rates = SAMSUNG_I2S_RATES;
i2s->i2s_dai_drv.playback.formats = SAMSUNG_I2S_FMTS;
if (!sec) {
i2s->i2s_dai_drv.capture.channels_min = 1;
i2s->i2s_dai_drv.capture.channels_max = 2;
i2s->i2s_dai_drv.capture.rates = SAMSUNG_I2S_RATES;
i2s->i2s_dai_drv.capture.formats = SAMSUNG_I2S_FMTS;
dev_set_drvdata(&i2s->pdev->dev, i2s);
} else { /* Create a new platform_device for Secondary */
i2s->pdev = platform_device_alloc("samsung-i2s-sec", -1);
if (!i2s->pdev)
return NULL;
i2s->pdev->dev.parent = &pdev->dev;
platform_set_drvdata(i2s->pdev, i2s);
ret = platform_device_add(i2s->pdev);
if (ret < 0)
return NULL;
}
return i2s;
}
static const struct of_device_id exynos_i2s_match[];
static inline const struct samsung_i2s_dai_data *samsung_i2s_get_driver_data(
struct platform_device *pdev)
{
if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
const struct of_device_id *match;
match = of_match_node(exynos_i2s_match, pdev->dev.of_node);
return match ? match->data : NULL;
} else {
return (struct samsung_i2s_dai_data *)
platform_get_device_id(pdev)->driver_data;
}
}
#ifdef CONFIG_PM
static int i2s_runtime_suspend(struct device *dev)
{
struct i2s_dai *i2s = dev_get_drvdata(dev);
clk_disable_unprepare(i2s->clk);
return 0;
}
static int i2s_runtime_resume(struct device *dev)
{
struct i2s_dai *i2s = dev_get_drvdata(dev);
clk_prepare_enable(i2s->clk);
return 0;
}
#endif /* CONFIG_PM */
static void i2s_unregister_clocks(struct i2s_dai *i2s)
{
int i;
for (i = 0; i < i2s->clk_data.clk_num; i++) {
if (!IS_ERR(i2s->clk_table[i]))
clk_unregister(i2s->clk_table[i]);
}
}
static void i2s_unregister_clock_provider(struct platform_device *pdev)
{
struct i2s_dai *i2s = dev_get_drvdata(&pdev->dev);
of_clk_del_provider(pdev->dev.of_node);
i2s_unregister_clocks(i2s);
}
static int i2s_register_clock_provider(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct i2s_dai *i2s = dev_get_drvdata(dev);
const char *clk_name[2] = { "i2s_opclk0", "i2s_opclk1" };
const char *p_names[2] = { NULL };
const struct samsung_i2s_variant_regs *reg_info = i2s->variant_regs;
struct clk *rclksrc;
int ret, i;
/* Register the clock provider only if it's expected in the DTB */
if (!of_find_property(dev->of_node, "#clock-cells", NULL))
return 0;
/* Get the RCLKSRC mux clock parent clock names */
for (i = 0; i < ARRAY_SIZE(p_names); i++) {
rclksrc = clk_get(dev, clk_name[i]);
if (IS_ERR(rclksrc))
continue;
p_names[i] = __clk_get_name(rclksrc);
clk_put(rclksrc);
}
if (!(i2s->quirks & QUIRK_NO_MUXPSR)) {
/* Activate the prescaler */
u32 val = readl(i2s->addr + I2SPSR);
writel(val | PSR_PSREN, i2s->addr + I2SPSR);
i2s->clk_table[CLK_I2S_RCLK_SRC] = clk_register_mux(NULL,
"i2s_rclksrc", p_names, ARRAY_SIZE(p_names),
CLK_SET_RATE_NO_REPARENT | CLK_SET_RATE_PARENT,
i2s->addr + I2SMOD, reg_info->rclksrc_off,
1, 0, i2s->lock);
i2s->clk_table[CLK_I2S_RCLK_PSR] = clk_register_divider(NULL,
"i2s_presc", "i2s_rclksrc",
CLK_SET_RATE_PARENT,
i2s->addr + I2SPSR, 8, 6, 0, i2s->lock);
p_names[0] = "i2s_presc";
i2s->clk_data.clk_num = 2;
}
of_property_read_string_index(dev->of_node,
"clock-output-names", 0, &clk_name[0]);
i2s->clk_table[CLK_I2S_CDCLK] = clk_register_gate(NULL, clk_name[0],
p_names[0], CLK_SET_RATE_PARENT,
i2s->addr + I2SMOD, reg_info->cdclkcon_off,
CLK_GATE_SET_TO_DISABLE, i2s->lock);
i2s->clk_data.clk_num += 1;
i2s->clk_data.clks = i2s->clk_table;
ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get,
&i2s->clk_data);
if (ret < 0) {
dev_err(dev, "failed to add clock provider: %d\n", ret);
i2s_unregister_clocks(i2s);
}
return ret;
}
static int samsung_i2s_probe(struct platform_device *pdev)
{
struct i2s_dai *pri_dai, *sec_dai = NULL;
struct s3c_audio_pdata *i2s_pdata = pdev->dev.platform_data;
struct samsung_i2s *i2s_cfg = NULL;
struct resource *res;
u32 regs_base, quirks = 0, idma_addr = 0;
struct device_node *np = pdev->dev.of_node;
const struct samsung_i2s_dai_data *i2s_dai_data;
int ret;
/* Call during Seconday interface registration */
i2s_dai_data = samsung_i2s_get_driver_data(pdev);
if (i2s_dai_data->dai_type == TYPE_SEC) {
sec_dai = dev_get_drvdata(&pdev->dev);
if (!sec_dai) {
dev_err(&pdev->dev, "Unable to get drvdata\n");
return -EFAULT;
}
ret = devm_snd_soc_register_component(&sec_dai->pdev->dev,
&samsung_i2s_component,
&sec_dai->i2s_dai_drv, 1);
if (ret != 0)
return ret;
return samsung_asoc_dma_platform_register(&pdev->dev,
sec_dai->filter);
}
pri_dai = i2s_alloc_dai(pdev, false);
if (!pri_dai) {
dev_err(&pdev->dev, "Unable to alloc I2S_pri\n");
return -ENOMEM;
}
spin_lock_init(&pri_dai->spinlock);
pri_dai->lock = &pri_dai->spinlock;
if (!np) {
if (i2s_pdata == NULL) {
dev_err(&pdev->dev, "Can't work without s3c_audio_pdata\n");
return -EINVAL;
}
pri_dai->dma_playback.slave = i2s_pdata->dma_playback;
pri_dai->dma_capture.slave = i2s_pdata->dma_capture;
pri_dai->filter = i2s_pdata->dma_filter;
if (&i2s_pdata->type)
i2s_cfg = &i2s_pdata->type.i2s;
if (i2s_cfg) {
quirks = i2s_cfg->quirks;
idma_addr = i2s_cfg->idma_addr;
}
} else {
quirks = i2s_dai_data->quirks;
if (of_property_read_u32(np, "samsung,idma-addr",
&idma_addr)) {
if (quirks & QUIRK_SUPPORTS_IDMA) {
dev_info(&pdev->dev, "idma address is not"\
"specified");
}
}
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pri_dai->addr = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(pri_dai->addr))
return PTR_ERR(pri_dai->addr);
regs_base = res->start;
pri_dai->clk = devm_clk_get(&pdev->dev, "iis");
if (IS_ERR(pri_dai->clk)) {
dev_err(&pdev->dev, "Failed to get iis clock\n");
return PTR_ERR(pri_dai->clk);
}
ret = clk_prepare_enable(pri_dai->clk);
if (ret != 0) {
dev_err(&pdev->dev, "failed to enable clock: %d\n", ret);
return ret;
}
pri_dai->dma_playback.dma_addr = regs_base + I2STXD;
pri_dai->dma_capture.dma_addr = regs_base + I2SRXD;
pri_dai->dma_playback.ch_name = "tx";
pri_dai->dma_capture.ch_name = "rx";
pri_dai->dma_playback.dma_size = 4;
pri_dai->dma_capture.dma_size = 4;
pri_dai->quirks = quirks;
pri_dai->variant_regs = i2s_dai_data->i2s_variant_regs;
if (quirks & QUIRK_PRI_6CHAN)
pri_dai->i2s_dai_drv.playback.channels_max = 6;
if (quirks & QUIRK_SEC_DAI) {
sec_dai = i2s_alloc_dai(pdev, true);
if (!sec_dai) {
dev_err(&pdev->dev, "Unable to alloc I2S_sec\n");
return -ENOMEM;
}
sec_dai->lock = &pri_dai->spinlock;
sec_dai->variant_regs = pri_dai->variant_regs;
sec_dai->dma_playback.dma_addr = regs_base + I2STXDS;
sec_dai->dma_playback.ch_name = "tx-sec";
if (!np) {
sec_dai->dma_playback.slave = i2s_pdata->dma_play_sec;
sec_dai->filter = i2s_pdata->dma_filter;
}
sec_dai->dma_playback.dma_size = 4;
sec_dai->addr = pri_dai->addr;
sec_dai->clk = pri_dai->clk;
sec_dai->quirks = quirks;
sec_dai->idma_playback.dma_addr = idma_addr;
sec_dai->pri_dai = pri_dai;
pri_dai->sec_dai = sec_dai;
}
if (i2s_pdata && i2s_pdata->cfg_gpio && i2s_pdata->cfg_gpio(pdev)) {
dev_err(&pdev->dev, "Unable to configure gpio\n");
return -EINVAL;
}
devm_snd_soc_register_component(&pri_dai->pdev->dev,
&samsung_i2s_component,
&pri_dai->i2s_dai_drv, 1);
pm_runtime_enable(&pdev->dev);
ret = samsung_asoc_dma_platform_register(&pdev->dev, pri_dai->filter);
if (ret != 0)
return ret;
return i2s_register_clock_provider(pdev);
}
static int samsung_i2s_remove(struct platform_device *pdev)
{
struct i2s_dai *i2s, *other;
i2s = dev_get_drvdata(&pdev->dev);
other = get_other_dai(i2s);
if (other) {
other->pri_dai = NULL;
other->sec_dai = NULL;
} else {
pm_runtime_disable(&pdev->dev);
}
if (!is_secondary(i2s)) {
i2s_unregister_clock_provider(pdev);
clk_disable_unprepare(i2s->clk);
}
i2s->pri_dai = NULL;
i2s->sec_dai = NULL;
return 0;
}
static const struct samsung_i2s_variant_regs i2sv3_regs = {
.bfs_off = 1,
.rfs_off = 3,
.sdf_off = 5,
.txr_off = 8,
.rclksrc_off = 10,
.mss_off = 11,
.cdclkcon_off = 12,
.lrp_off = 7,
.bfs_mask = 0x3,
.rfs_mask = 0x3,
.ftx0cnt_off = 8,
};
static const struct samsung_i2s_variant_regs i2sv6_regs = {
.bfs_off = 0,
.rfs_off = 4,
.sdf_off = 6,
.txr_off = 8,
.rclksrc_off = 10,
.mss_off = 11,
.cdclkcon_off = 12,
.lrp_off = 15,
.bfs_mask = 0xf,
.rfs_mask = 0x3,
.ftx0cnt_off = 8,
};
static const struct samsung_i2s_variant_regs i2sv7_regs = {
.bfs_off = 0,
.rfs_off = 4,
.sdf_off = 7,
.txr_off = 9,
.rclksrc_off = 11,
.mss_off = 12,
.cdclkcon_off = 22,
.lrp_off = 15,
.bfs_mask = 0xf,
.rfs_mask = 0x7,
.ftx0cnt_off = 0,
};
static const struct samsung_i2s_variant_regs i2sv5_i2s1_regs = {
.bfs_off = 0,
.rfs_off = 3,
.sdf_off = 6,
.txr_off = 8,
.rclksrc_off = 10,
.mss_off = 11,
.cdclkcon_off = 12,
.lrp_off = 15,
.bfs_mask = 0x7,
.rfs_mask = 0x7,
.ftx0cnt_off = 8,
};
static const struct samsung_i2s_dai_data i2sv3_dai_type = {
.dai_type = TYPE_PRI,
.quirks = QUIRK_NO_MUXPSR,
.i2s_variant_regs = &i2sv3_regs,
};
static const struct samsung_i2s_dai_data i2sv5_dai_type = {
.dai_type = TYPE_PRI,
.quirks = QUIRK_PRI_6CHAN | QUIRK_SEC_DAI | QUIRK_NEED_RSTCLR |
QUIRK_SUPPORTS_IDMA,
.i2s_variant_regs = &i2sv3_regs,
};
static const struct samsung_i2s_dai_data i2sv6_dai_type = {
.dai_type = TYPE_PRI,
.quirks = QUIRK_PRI_6CHAN | QUIRK_SEC_DAI | QUIRK_NEED_RSTCLR |
QUIRK_SUPPORTS_TDM | QUIRK_SUPPORTS_IDMA,
.i2s_variant_regs = &i2sv6_regs,
};
static const struct samsung_i2s_dai_data i2sv7_dai_type = {
.dai_type = TYPE_PRI,
.quirks = QUIRK_PRI_6CHAN | QUIRK_SEC_DAI | QUIRK_NEED_RSTCLR |
QUIRK_SUPPORTS_TDM,
.i2s_variant_regs = &i2sv7_regs,
};
static const struct samsung_i2s_dai_data i2sv5_dai_type_i2s1 = {
.dai_type = TYPE_PRI,
.quirks = QUIRK_PRI_6CHAN | QUIRK_NEED_RSTCLR,
.i2s_variant_regs = &i2sv5_i2s1_regs,
};
static const struct samsung_i2s_dai_data samsung_dai_type_pri = {
.dai_type = TYPE_PRI,
};
static const struct samsung_i2s_dai_data samsung_dai_type_sec = {
.dai_type = TYPE_SEC,
};
static const struct platform_device_id samsung_i2s_driver_ids[] = {
{
.name = "samsung-i2s",
.driver_data = (kernel_ulong_t)&i2sv3_dai_type,
}, {
.name = "samsung-i2s-sec",
.driver_data = (kernel_ulong_t)&samsung_dai_type_sec,
}, {
.name = "samsung-i2sv4",
.driver_data = (kernel_ulong_t)&i2sv5_dai_type,
},
{},
};
MODULE_DEVICE_TABLE(platform, samsung_i2s_driver_ids);
#ifdef CONFIG_OF
static const struct of_device_id exynos_i2s_match[] = {
{
.compatible = "samsung,s3c6410-i2s",
.data = &i2sv3_dai_type,
}, {
.compatible = "samsung,s5pv210-i2s",
.data = &i2sv5_dai_type,
}, {
.compatible = "samsung,exynos5420-i2s",
.data = &i2sv6_dai_type,
}, {
.compatible = "samsung,exynos7-i2s",
.data = &i2sv7_dai_type,
}, {
.compatible = "samsung,exynos7-i2s1",
.data = &i2sv5_dai_type_i2s1,
},
{},
};
MODULE_DEVICE_TABLE(of, exynos_i2s_match);
#endif
static const struct dev_pm_ops samsung_i2s_pm = {
SET_RUNTIME_PM_OPS(i2s_runtime_suspend,
i2s_runtime_resume, NULL)
};
static struct platform_driver samsung_i2s_driver = {
.probe = samsung_i2s_probe,
.remove = samsung_i2s_remove,
.id_table = samsung_i2s_driver_ids,
.driver = {
.name = "samsung-i2s",
.of_match_table = of_match_ptr(exynos_i2s_match),
.pm = &samsung_i2s_pm,
},
};
module_platform_driver(samsung_i2s_driver);
/* Module information */
MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
MODULE_DESCRIPTION("Samsung I2S Interface");
MODULE_ALIAS("platform:samsung-i2s");
MODULE_LICENSE("GPL");
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