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/*
* ALSA SoC SPDIF Audio Layer for STMP3xxx processor familiy
*
* Vladimir Barinov <vbarinov@embeddedalley.com>
*
* Copyright 2008 SigmaTel, Inc
* Copyright 2008 Embedded Alley Solutions, Inc
* Copyright 2008-2009 Freescale Semiconductor, 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/device.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <mach/dma.h>
#include <mach/regs-spdif.h>
#include "stmp3xxx_pcm.h"
#include <mach/platform.h>
#define STMP3XXX_SPDIF_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \
SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
#define STMP3XXX_SPDIF_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_S32_LE)
static struct stmp3xxx_pcm_dma_params stmp3xxx_spdif = {
.name = "stmp3xxx spdif",
.dma_bus = STMP3XXX_BUS_APBX,
.dma_ch = 2,
.irq = IRQ_SPDIF_DMA,
};
static irqreturn_t stmp3xxx_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 stmp3xxx_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 stmp3xxx_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 = &stmp3xxx_spdif;
}
ret = request_irq(irq, stmp3xxx_err_irq, 0, "STMP3xxx 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 stmp3xxx_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 stmp3xxx_spdif_suspend(struct snd_soc_dai *cpu_dai)
{
return 0;
}
static int stmp3xxx_spdif_resume(struct snd_soc_dai *cpu_dai)
{
return 0;
}
#else
#define stmp3xxx_spdif_suspend NULL
#define stmp3xxx_spdif_resume NULL
#endif /* CONFIG_PM */
struct snd_soc_dai_ops stmp3xxx_spdif_dai_ops = {
.startup = stmp3xxx_spdif_startup,
.shutdown = stmp3xxx_spdif_shutdown,
.trigger = stmp3xxx_spdif_trigger,
};
struct snd_soc_dai stmp3xxx_spdif_dai = {
.name = "stmp3xxx spdif",
.id = 0,
.suspend = stmp3xxx_spdif_suspend,
.resume = stmp3xxx_spdif_resume,
.playback = {
.channels_min = 2,
.channels_max = 2,
.rates = STMP3XXX_SPDIF_RATES,
.formats = STMP3XXX_SPDIF_FORMATS,
},
.capture = {
.channels_min = 2,
.channels_max = 2,
.rates = STMP3XXX_SPDIF_RATES,
.formats = STMP3XXX_SPDIF_FORMATS,
},
.ops = &stmp3xxx_spdif_dai_ops,
};
EXPORT_SYMBOL_GPL(stmp3xxx_spdif_dai);
static int __init stmp3xxx_spdif_dai_init(void)
{
return snd_soc_register_dai(&stmp3xxx_spdif_dai);
}
static void __exit stmp3xxx_spdif_dai_exit(void)
{
snd_soc_unregister_dai(&stmp3xxx_spdif_dai);
}
module_init(stmp3xxx_spdif_dai_init);
module_exit(stmp3xxx_spdif_dai_exit);
MODULE_AUTHOR("Vladimir Barinov");
MODULE_DESCRIPTION("stmp3xxx SPDIF DAI");
MODULE_LICENSE("GPL");
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