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/*
* ALSA SoC SPDIF Audio Layer for MXS
*
* Copyright (C) 2008-2010 Freescale Semiconductor, Inc.
*
* Based on stmp3xxx_spdif_dai.c
* Vladimir Barinov <vbarinov@embeddedalley.com>
* Copyright 2008 SigmaTel, Inc
* Copyright 2008 Embedded Alley Solutions, Inc
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <mach/dma.h>
#include <mach/hardware.h>
#include "../codecs/mxs_spdif.h"
#include "mxs-pcm.h"
#define REGS_SPDIF_BASE IO_ADDRESS(SPDIF_PHYS_ADDR)
struct mxs_pcm_dma_params mxs_spdif = {
.name = "mxs spdif",
.dma_ch = MXS_DMA_CHANNEL_AHB_APBX_SPDIF,
.irq = IRQ_SPDIF_DMA,
};
static irqreturn_t mxs_err_irq(int irq, void *dev_id)
{
struct snd_pcm_substream *substream = dev_id;
int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0;
u32 ctrl_reg = 0;
u32 overflow_mask;
u32 underflow_mask;
if (playback) {
ctrl_reg = __raw_readl(REGS_SPDIF_BASE + HW_SPDIF_CTRL);
underflow_mask = BM_SPDIF_CTRL_FIFO_UNDERFLOW_IRQ;
overflow_mask = BM_SPDIF_CTRL_FIFO_OVERFLOW_IRQ;
}
if (ctrl_reg & underflow_mask) {
printk(KERN_DEBUG "underflow detected SPDIF\n");
if (playback)
__raw_writel(BM_SPDIF_CTRL_FIFO_UNDERFLOW_IRQ,
REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR);
} else if (ctrl_reg & overflow_mask) {
printk(KERN_DEBUG "overflow detected SPDIF\n");
if (playback)
__raw_writel(BM_SPDIF_CTRL_FIFO_OVERFLOW_IRQ,
REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR);
} else
printk(KERN_WARNING "Unknown SPDIF error interrupt\n");
return IRQ_HANDLED;
}
static int mxs_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0;
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
if (playback)
__raw_writel(BM_SPDIF_CTRL_RUN,
REGS_SPDIF_BASE + HW_SPDIF_CTRL_SET);
break;
case SNDRV_PCM_TRIGGER_STOP:
if (playback)
__raw_writel(BM_SPDIF_CTRL_RUN,
REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR);
break;
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
default:
ret = -EINVAL;
}
return ret;
}
static int mxs_spdif_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0;
int irq;
int ret;
if (playback) {
irq = IRQ_SPDIF_ERROR;
cpu_dai->dma_data = &mxs_spdif;
}
ret = request_irq(irq, mxs_err_irq, 0, "Mxs SPDIF Error",
substream);
if (ret) {
printk(KERN_ERR "%s: Unable to request SPDIF error irq %d\n",
__func__, IRQ_SPDIF_ERROR);
return ret;
}
/* Enable error interrupt */
if (playback) {
__raw_writel(BM_SPDIF_CTRL_FIFO_OVERFLOW_IRQ,
REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR);
__raw_writel(BM_SPDIF_CTRL_FIFO_UNDERFLOW_IRQ,
REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR);
__raw_writel(BM_SPDIF_CTRL_FIFO_ERROR_IRQ_EN,
REGS_SPDIF_BASE + HW_SPDIF_CTRL_SET);
}
return 0;
}
static void mxs_spdif_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
int playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0;
/* Disable error interrupt */
if (playback) {
__raw_writel(BM_SPDIF_CTRL_FIFO_ERROR_IRQ_EN,
REGS_SPDIF_BASE + HW_SPDIF_CTRL_CLR);
free_irq(IRQ_SPDIF_ERROR, substream);
}
}
#ifdef CONFIG_PM
static int mxs_spdif_suspend(struct snd_soc_dai *cpu_dai)
{
return 0;
}
static int mxs_spdif_resume(struct snd_soc_dai *cpu_dai)
{
return 0;
}
#else
#define mxs_spdif_suspend NULL
#define mxs_spdif_resume NULL
#endif /* CONFIG_PM */
struct snd_soc_dai_ops mxs_spdif_dai_ops = {
.startup = mxs_spdif_startup,
.shutdown = mxs_spdif_shutdown,
.trigger = mxs_spdif_trigger,
};
struct snd_soc_dai mxs_spdif_dai = {
.name = "mxs-spdif",
.id = 0,
.suspend = mxs_spdif_suspend,
.resume = mxs_spdif_resume,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = MXS_SPDIF_RATES,
.formats = MXS_SPDIF_FORMATS,
},
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = MXS_SPDIF_RATES,
.formats = MXS_SPDIF_FORMATS,
},
.ops = &mxs_spdif_dai_ops,
};
EXPORT_SYMBOL_GPL(mxs_spdif_dai);
static int __init mxs_spdif_dai_init(void)
{
return snd_soc_register_dai(&mxs_spdif_dai);
}
static void __exit mxs_spdif_dai_exit(void)
{
snd_soc_unregister_dai(&mxs_spdif_dai);
}
module_init(mxs_spdif_dai_init);
module_exit(mxs_spdif_dai_exit);
MODULE_AUTHOR("Vladimir Barinov");
MODULE_DESCRIPTION("MXS SPDIF DAI");
MODULE_LICENSE("GPL");
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