linux/sound/soc/imx/imx-ssi.c
Javier Martin 5ed80a75b2 ASoC: i.MX SSI: Fix DSP_A format.
According to i.MX27 Reference Manual (p 1593) TXBIT0 bit selects
whether the most significant or the less significant part of the
data word written to the FIFO is transmitted.

As DSP_A is the same as DSP_B with a data offset of 1 bit, it
doesn't make any sense to remove TXBIT0 bit here.

Signed-off-by: Javier Martin <javier.martin@vista-silicon.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org
2012-02-23 18:58:17 +00:00

767 lines
18 KiB
C

/*
* imx-ssi.c -- ALSA Soc Audio Layer
*
* Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
*
* This code is based on code copyrighted by Freescale,
* Liam Girdwood, Javier Martin and probably others.
*
* 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.
*
*
* The i.MX SSI core has some nasty limitations in AC97 mode. While most
* sane processor vendors have a FIFO per AC97 slot, the i.MX has only
* one FIFO which combines all valid receive slots. We cannot even select
* which slots we want to receive. The WM9712 with which this driver
* was developed with always sends GPIO status data in slot 12 which
* we receive in our (PCM-) data stream. The only chance we have is to
* manually skip this data in the FIQ handler. With sampling rates different
* from 48000Hz not every frame has valid receive data, so the ratio
* between pcm data and GPIO status data changes. Our FIQ handler is not
* able to handle this, hence this driver only works with 48000Hz sampling
* rate.
* Reading and writing AC97 registers is another challenge. The core
* provides us status bits when the read register is updated with *another*
* value. When we read the same register two times (and the register still
* contains the same value) these status bits are not set. We work
* around this by not polling these bits but only wait a fixed delay.
*
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <mach/ssi.h>
#include <mach/hardware.h>
#include "imx-ssi.h"
#define SSI_SACNT_DEFAULT (SSI_SACNT_AC97EN | SSI_SACNT_FV)
/*
* SSI Network Mode or TDM slots configuration.
* Should only be called when port is inactive (i.e. SSIEN = 0).
*/
static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
{
struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
u32 sccr;
sccr = readl(ssi->base + SSI_STCCR);
sccr &= ~SSI_STCCR_DC_MASK;
sccr |= SSI_STCCR_DC(slots - 1);
writel(sccr, ssi->base + SSI_STCCR);
sccr = readl(ssi->base + SSI_SRCCR);
sccr &= ~SSI_STCCR_DC_MASK;
sccr |= SSI_STCCR_DC(slots - 1);
writel(sccr, ssi->base + SSI_SRCCR);
writel(tx_mask, ssi->base + SSI_STMSK);
writel(rx_mask, ssi->base + SSI_SRMSK);
return 0;
}
/*
* SSI DAI format configuration.
* Should only be called when port is inactive (i.e. SSIEN = 0).
*/
static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
{
struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
u32 strcr = 0, scr;
scr = readl(ssi->base + SSI_SCR) & ~(SSI_SCR_SYN | SSI_SCR_NET);
/* DAI mode */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
/* data on rising edge of bclk, frame low 1clk before data */
strcr |= SSI_STCR_TFSI | SSI_STCR_TEFS | SSI_STCR_TXBIT0;
scr |= SSI_SCR_NET;
if (ssi->flags & IMX_SSI_USE_I2S_SLAVE) {
scr &= ~SSI_I2S_MODE_MASK;
scr |= SSI_SCR_I2S_MODE_SLAVE;
}
break;
case SND_SOC_DAIFMT_LEFT_J:
/* data on rising edge of bclk, frame high with data */
strcr |= SSI_STCR_TXBIT0;
break;
case SND_SOC_DAIFMT_DSP_B:
/* data on rising edge of bclk, frame high with data */
strcr |= SSI_STCR_TFSL | SSI_STCR_TXBIT0;
break;
case SND_SOC_DAIFMT_DSP_A:
/* data on rising edge of bclk, frame high 1clk before data */
strcr |= SSI_STCR_TFSL | SSI_STCR_TXBIT0 | SSI_STCR_TEFS;
break;
}
/* DAI clock inversion */
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_IB_IF:
strcr |= SSI_STCR_TFSI;
strcr &= ~SSI_STCR_TSCKP;
break;
case SND_SOC_DAIFMT_IB_NF:
strcr &= ~(SSI_STCR_TSCKP | SSI_STCR_TFSI);
break;
case SND_SOC_DAIFMT_NB_IF:
strcr |= SSI_STCR_TFSI | SSI_STCR_TSCKP;
break;
case SND_SOC_DAIFMT_NB_NF:
strcr &= ~SSI_STCR_TFSI;
strcr |= SSI_STCR_TSCKP;
break;
}
/* DAI clock master masks */
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBM_CFM:
break;
default:
/* Master mode not implemented, needs handling of clocks. */
return -EINVAL;
}
strcr |= SSI_STCR_TFEN0;
if (ssi->flags & IMX_SSI_NET)
scr |= SSI_SCR_NET;
if (ssi->flags & IMX_SSI_SYN)
scr |= SSI_SCR_SYN;
writel(strcr, ssi->base + SSI_STCR);
writel(strcr, ssi->base + SSI_SRCR);
writel(scr, ssi->base + SSI_SCR);
return 0;
}
/*
* SSI system clock configuration.
* Should only be called when port is inactive (i.e. SSIEN = 0).
*/
static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq, int dir)
{
struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
u32 scr;
scr = readl(ssi->base + SSI_SCR);
switch (clk_id) {
case IMX_SSP_SYS_CLK:
if (dir == SND_SOC_CLOCK_OUT)
scr |= SSI_SCR_SYS_CLK_EN;
else
scr &= ~SSI_SCR_SYS_CLK_EN;
break;
default:
return -EINVAL;
}
writel(scr, ssi->base + SSI_SCR);
return 0;
}
/*
* SSI Clock dividers
* Should only be called when port is inactive (i.e. SSIEN = 0).
*/
static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
int div_id, int div)
{
struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
u32 stccr, srccr;
stccr = readl(ssi->base + SSI_STCCR);
srccr = readl(ssi->base + SSI_SRCCR);
switch (div_id) {
case IMX_SSI_TX_DIV_2:
stccr &= ~SSI_STCCR_DIV2;
stccr |= div;
break;
case IMX_SSI_TX_DIV_PSR:
stccr &= ~SSI_STCCR_PSR;
stccr |= div;
break;
case IMX_SSI_TX_DIV_PM:
stccr &= ~0xff;
stccr |= SSI_STCCR_PM(div);
break;
case IMX_SSI_RX_DIV_2:
stccr &= ~SSI_STCCR_DIV2;
stccr |= div;
break;
case IMX_SSI_RX_DIV_PSR:
stccr &= ~SSI_STCCR_PSR;
stccr |= div;
break;
case IMX_SSI_RX_DIV_PM:
stccr &= ~0xff;
stccr |= SSI_STCCR_PM(div);
break;
default:
return -EINVAL;
}
writel(stccr, ssi->base + SSI_STCCR);
writel(srccr, ssi->base + SSI_SRCCR);
return 0;
}
/*
* Should only be called when port is inactive (i.e. SSIEN = 0),
* although can be called multiple times by upper layers.
*/
static int imx_ssi_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *cpu_dai)
{
struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
struct imx_pcm_dma_params *dma_data;
u32 reg, sccr;
/* Tx/Rx config */
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
reg = SSI_STCCR;
dma_data = &ssi->dma_params_tx;
} else {
reg = SSI_SRCCR;
dma_data = &ssi->dma_params_rx;
}
if (ssi->flags & IMX_SSI_SYN)
reg = SSI_STCCR;
snd_soc_dai_set_dma_data(cpu_dai, substream, dma_data);
sccr = readl(ssi->base + reg) & ~SSI_STCCR_WL_MASK;
/* DAI data (word) size */
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
sccr |= SSI_SRCCR_WL(16);
break;
case SNDRV_PCM_FORMAT_S20_3LE:
sccr |= SSI_SRCCR_WL(20);
break;
case SNDRV_PCM_FORMAT_S24_LE:
sccr |= SSI_SRCCR_WL(24);
break;
}
writel(sccr, ssi->base + reg);
return 0;
}
static int imx_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct imx_ssi *ssi = snd_soc_dai_get_drvdata(dai);
unsigned int sier_bits, sier;
unsigned int scr;
scr = readl(ssi->base + SSI_SCR);
sier = readl(ssi->base + SSI_SIER);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (ssi->flags & IMX_SSI_DMA)
sier_bits = SSI_SIER_TDMAE;
else
sier_bits = SSI_SIER_TIE | SSI_SIER_TFE0_EN;
} else {
if (ssi->flags & IMX_SSI_DMA)
sier_bits = SSI_SIER_RDMAE;
else
sier_bits = SSI_SIER_RIE | SSI_SIER_RFF0_EN;
}
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
scr |= SSI_SCR_TE;
else
scr |= SSI_SCR_RE;
sier |= sier_bits;
if (++ssi->enabled == 1)
scr |= SSI_SCR_SSIEN;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
scr &= ~SSI_SCR_TE;
else
scr &= ~SSI_SCR_RE;
sier &= ~sier_bits;
if (--ssi->enabled == 0)
scr &= ~SSI_SCR_SSIEN;
break;
default:
return -EINVAL;
}
if (!(ssi->flags & IMX_SSI_USE_AC97))
/* rx/tx are always enabled to access ac97 registers */
writel(scr, ssi->base + SSI_SCR);
writel(sier, ssi->base + SSI_SIER);
return 0;
}
static const struct snd_soc_dai_ops imx_ssi_pcm_dai_ops = {
.hw_params = imx_ssi_hw_params,
.set_fmt = imx_ssi_set_dai_fmt,
.set_clkdiv = imx_ssi_set_dai_clkdiv,
.set_sysclk = imx_ssi_set_dai_sysclk,
.set_tdm_slot = imx_ssi_set_dai_tdm_slot,
.trigger = imx_ssi_trigger,
};
int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int ret;
ret = dma_mmap_writecombine(substream->pcm->card->dev, vma,
runtime->dma_area, runtime->dma_addr, runtime->dma_bytes);
pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,
runtime->dma_area,
runtime->dma_addr,
runtime->dma_bytes);
return ret;
}
EXPORT_SYMBOL_GPL(snd_imx_pcm_mmap);
static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream)
{
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
struct snd_dma_buffer *buf = &substream->dma_buffer;
size_t size = IMX_SSI_DMABUF_SIZE;
buf->dev.type = SNDRV_DMA_TYPE_DEV;
buf->dev.dev = pcm->card->dev;
buf->private_data = NULL;
buf->area = dma_alloc_writecombine(pcm->card->dev, size,
&buf->addr, GFP_KERNEL);
if (!buf->area)
return -ENOMEM;
buf->bytes = size;
return 0;
}
static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);
int imx_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_card *card = rtd->card->snd_card;
struct snd_pcm *pcm = rtd->pcm;
int ret = 0;
if (!card->dev->dma_mask)
card->dev->dma_mask = &imx_pcm_dmamask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) {
ret = imx_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_PLAYBACK);
if (ret)
goto out;
}
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
ret = imx_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_CAPTURE);
if (ret)
goto out;
}
out:
return ret;
}
EXPORT_SYMBOL_GPL(imx_pcm_new);
void imx_pcm_free(struct snd_pcm *pcm)
{
struct snd_pcm_substream *substream;
struct snd_dma_buffer *buf;
int stream;
for (stream = 0; stream < 2; stream++) {
substream = pcm->streams[stream].substream;
if (!substream)
continue;
buf = &substream->dma_buffer;
if (!buf->area)
continue;
dma_free_writecombine(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
}
}
EXPORT_SYMBOL_GPL(imx_pcm_free);
static int imx_ssi_dai_probe(struct snd_soc_dai *dai)
{
struct imx_ssi *ssi = dev_get_drvdata(dai->dev);
uint32_t val;
snd_soc_dai_set_drvdata(dai, ssi);
val = SSI_SFCSR_TFWM0(ssi->dma_params_tx.burstsize) |
SSI_SFCSR_RFWM0(ssi->dma_params_rx.burstsize);
writel(val, ssi->base + SSI_SFCSR);
return 0;
}
static struct snd_soc_dai_driver imx_ssi_dai = {
.probe = imx_ssi_dai_probe,
.playback = {
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_96000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.capture = {
.channels_min = 1,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_96000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.ops = &imx_ssi_pcm_dai_ops,
};
static struct snd_soc_dai_driver imx_ac97_dai = {
.probe = imx_ssi_dai_probe,
.ac97_control = 1,
.playback = {
.stream_name = "AC97 Playback",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.capture = {
.stream_name = "AC97 Capture",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.ops = &imx_ssi_pcm_dai_ops,
};
static void setup_channel_to_ac97(struct imx_ssi *imx_ssi)
{
void __iomem *base = imx_ssi->base;
writel(0x0, base + SSI_SCR);
writel(0x0, base + SSI_STCR);
writel(0x0, base + SSI_SRCR);
writel(SSI_SCR_SYN | SSI_SCR_NET, base + SSI_SCR);
writel(SSI_SFCSR_RFWM0(8) |
SSI_SFCSR_TFWM0(8) |
SSI_SFCSR_RFWM1(8) |
SSI_SFCSR_TFWM1(8), base + SSI_SFCSR);
writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_STCCR);
writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_SRCCR);
writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN, base + SSI_SCR);
writel(SSI_SOR_WAIT(3), base + SSI_SOR);
writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN |
SSI_SCR_TE | SSI_SCR_RE,
base + SSI_SCR);
writel(SSI_SACNT_DEFAULT, base + SSI_SACNT);
writel(0xff, base + SSI_SACCDIS);
writel(0x300, base + SSI_SACCEN);
}
static struct imx_ssi *ac97_ssi;
static void imx_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
unsigned short val)
{
struct imx_ssi *imx_ssi = ac97_ssi;
void __iomem *base = imx_ssi->base;
unsigned int lreg;
unsigned int lval;
if (reg > 0x7f)
return;
pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
lreg = reg << 12;
writel(lreg, base + SSI_SACADD);
lval = val << 4;
writel(lval , base + SSI_SACDAT);
writel(SSI_SACNT_DEFAULT | SSI_SACNT_WR, base + SSI_SACNT);
udelay(100);
}
static unsigned short imx_ssi_ac97_read(struct snd_ac97 *ac97,
unsigned short reg)
{
struct imx_ssi *imx_ssi = ac97_ssi;
void __iomem *base = imx_ssi->base;
unsigned short val = -1;
unsigned int lreg;
lreg = (reg & 0x7f) << 12 ;
writel(lreg, base + SSI_SACADD);
writel(SSI_SACNT_DEFAULT | SSI_SACNT_RD, base + SSI_SACNT);
udelay(100);
val = (readl(base + SSI_SACDAT) >> 4) & 0xffff;
pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
return val;
}
static void imx_ssi_ac97_reset(struct snd_ac97 *ac97)
{
struct imx_ssi *imx_ssi = ac97_ssi;
if (imx_ssi->ac97_reset)
imx_ssi->ac97_reset(ac97);
}
static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97)
{
struct imx_ssi *imx_ssi = ac97_ssi;
if (imx_ssi->ac97_warm_reset)
imx_ssi->ac97_warm_reset(ac97);
}
struct snd_ac97_bus_ops soc_ac97_ops = {
.read = imx_ssi_ac97_read,
.write = imx_ssi_ac97_write,
.reset = imx_ssi_ac97_reset,
.warm_reset = imx_ssi_ac97_warm_reset
};
EXPORT_SYMBOL_GPL(soc_ac97_ops);
static int imx_ssi_probe(struct platform_device *pdev)
{
struct resource *res;
struct imx_ssi *ssi;
struct imx_ssi_platform_data *pdata = pdev->dev.platform_data;
int ret = 0;
struct snd_soc_dai_driver *dai;
ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
if (!ssi)
return -ENOMEM;
dev_set_drvdata(&pdev->dev, ssi);
if (pdata) {
ssi->ac97_reset = pdata->ac97_reset;
ssi->ac97_warm_reset = pdata->ac97_warm_reset;
ssi->flags = pdata->flags;
}
ssi->irq = platform_get_irq(pdev, 0);
ssi->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(ssi->clk)) {
ret = PTR_ERR(ssi->clk);
dev_err(&pdev->dev, "Cannot get the clock: %d\n",
ret);
goto failed_clk;
}
clk_enable(ssi->clk);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -ENODEV;
goto failed_get_resource;
}
if (!request_mem_region(res->start, resource_size(res), DRV_NAME)) {
dev_err(&pdev->dev, "request_mem_region failed\n");
ret = -EBUSY;
goto failed_get_resource;
}
ssi->base = ioremap(res->start, resource_size(res));
if (!ssi->base) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENODEV;
goto failed_ioremap;
}
if (ssi->flags & IMX_SSI_USE_AC97) {
if (ac97_ssi) {
ret = -EBUSY;
goto failed_ac97;
}
ac97_ssi = ssi;
setup_channel_to_ac97(ssi);
dai = &imx_ac97_dai;
} else
dai = &imx_ssi_dai;
writel(0x0, ssi->base + SSI_SIER);
ssi->dma_params_rx.dma_addr = res->start + SSI_SRX0;
ssi->dma_params_tx.dma_addr = res->start + SSI_STX0;
ssi->dma_params_tx.burstsize = 4;
ssi->dma_params_rx.burstsize = 4;
res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx0");
if (res)
ssi->dma_params_tx.dma = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx0");
if (res)
ssi->dma_params_rx.dma = res->start;
platform_set_drvdata(pdev, ssi);
ret = snd_soc_register_dai(&pdev->dev, dai);
if (ret) {
dev_err(&pdev->dev, "register DAI failed\n");
goto failed_register;
}
ssi->soc_platform_pdev_fiq = platform_device_alloc("imx-fiq-pcm-audio", pdev->id);
if (!ssi->soc_platform_pdev_fiq) {
ret = -ENOMEM;
goto failed_pdev_fiq_alloc;
}
platform_set_drvdata(ssi->soc_platform_pdev_fiq, ssi);
ret = platform_device_add(ssi->soc_platform_pdev_fiq);
if (ret) {
dev_err(&pdev->dev, "failed to add platform device\n");
goto failed_pdev_fiq_add;
}
ssi->soc_platform_pdev = platform_device_alloc("imx-pcm-audio", pdev->id);
if (!ssi->soc_platform_pdev) {
ret = -ENOMEM;
goto failed_pdev_alloc;
}
platform_set_drvdata(ssi->soc_platform_pdev, ssi);
ret = platform_device_add(ssi->soc_platform_pdev);
if (ret) {
dev_err(&pdev->dev, "failed to add platform device\n");
goto failed_pdev_add;
}
return 0;
failed_pdev_add:
platform_device_put(ssi->soc_platform_pdev);
failed_pdev_alloc:
platform_device_del(ssi->soc_platform_pdev_fiq);
failed_pdev_fiq_add:
platform_device_put(ssi->soc_platform_pdev_fiq);
failed_pdev_fiq_alloc:
snd_soc_unregister_dai(&pdev->dev);
failed_register:
failed_ac97:
iounmap(ssi->base);
failed_ioremap:
release_mem_region(res->start, resource_size(res));
failed_get_resource:
clk_disable(ssi->clk);
clk_put(ssi->clk);
failed_clk:
kfree(ssi);
return ret;
}
static int __devexit imx_ssi_remove(struct platform_device *pdev)
{
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
struct imx_ssi *ssi = platform_get_drvdata(pdev);
platform_device_unregister(ssi->soc_platform_pdev);
platform_device_unregister(ssi->soc_platform_pdev_fiq);
snd_soc_unregister_dai(&pdev->dev);
if (ssi->flags & IMX_SSI_USE_AC97)
ac97_ssi = NULL;
iounmap(ssi->base);
release_mem_region(res->start, resource_size(res));
clk_disable(ssi->clk);
clk_put(ssi->clk);
kfree(ssi);
return 0;
}
static struct platform_driver imx_ssi_driver = {
.probe = imx_ssi_probe,
.remove = __devexit_p(imx_ssi_remove),
.driver = {
.name = "imx-ssi",
.owner = THIS_MODULE,
},
};
module_platform_driver(imx_ssi_driver);
/* Module information */
MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>");
MODULE_DESCRIPTION("i.MX I2S/ac97 SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:imx-ssi");