- 根目录:
- sound
- soc
- imx
- imx-pcm-dma-mx2.c
/*
* imx-pcm-dma-mx2.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.
*/
#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 <linux/dmaengine.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <mach/dma.h>
#include "imx-ssi.h"
struct imx_pcm_runtime_data {
int period_bytes;
int periods;
int dma;
unsigned long offset;
unsigned long size;
void *buf;
int period_time;
struct dma_async_tx_descriptor *desc;
struct dma_chan *dma_chan;
struct imx_dma_data dma_data;
};
static void audio_dma_irq(void *data)
{
struct snd_pcm_substream *substream = (struct snd_pcm_substream *)data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
iprtd->offset += iprtd->period_bytes;
iprtd->offset %= iprtd->period_bytes * iprtd->periods;
snd_pcm_period_elapsed(substream);
}
static bool filter(struct dma_chan *chan, void *param)
{
struct imx_pcm_runtime_data *iprtd = param;
if (!imx_dma_is_general_purpose(chan))
return false;
chan->private = &iprtd->dma_data;
return true;
}
static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct imx_pcm_dma_params *dma_params;
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
struct dma_slave_config slave_config;
dma_cap_mask_t mask;
enum dma_slave_buswidth buswidth;
int ret;
dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
iprtd->dma_data.peripheral_type = IMX_DMATYPE_SSI;
iprtd->dma_data.priority = DMA_PRIO_HIGH;
iprtd->dma_data.dma_request = dma_params->dma;
/* Try to grab a DMA channel */
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
iprtd->dma_chan = dma_request_channel(mask, filter, iprtd);
if (!iprtd->dma_chan)
return -EINVAL;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
break;
case SNDRV_PCM_FORMAT_S20_3LE:
case SNDRV_PCM_FORMAT_S24_LE:
buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
break;
default:
return 0;
}
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
slave_config.direction = DMA_TO_DEVICE;
slave_config.dst_addr = dma_params->dma_addr;
slave_config.dst_addr_width = buswidth;
slave_config.dst_maxburst = dma_params->burstsize * buswidth;
} else {
slave_config.direction = DMA_FROM_DEVICE;
slave_config.src_addr = dma_params->dma_addr;
slave_config.src_addr_width = buswidth;
slave_config.src_maxburst = dma_params->burstsize * buswidth;
}
ret = dmaengine_slave_config(iprtd->dma_chan, &slave_config);
if (ret)
return ret;
return 0;
}
static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
unsigned long dma_addr;
struct dma_chan *chan;
struct imx_pcm_dma_params *dma_params;
int ret;
dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
ret = imx_ssi_dma_alloc(substream, params);
if (ret)
return ret;
chan = iprtd->dma_chan;
iprtd->size = params_buffer_bytes(params);
iprtd->periods = params_periods(params);
iprtd->period_bytes = params_period_bytes(params);
iprtd->offset = 0;
iprtd->period_time = HZ / (params_rate(params) /
params_period_size(params));
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
dma_addr = runtime->dma_addr;
iprtd->buf = (unsigned int *)substream->dma_buffer.area;
iprtd->desc = chan->device->device_prep_dma_cyclic(chan, dma_addr,
iprtd->period_bytes * iprtd->periods,
iprtd->period_bytes,
substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
DMA_TO_DEVICE : DMA_FROM_DEVICE);
if (!iprtd->desc) {
dev_err(&chan->dev->device, "cannot prepare slave dma\n");
return -EINVAL;
}
iprtd->desc->callback = audio_dma_irq;
iprtd->desc->callback_param = substream;
return 0;
}
static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
if (iprtd->dma_chan) {
dma_release_channel(iprtd->dma_chan);
iprtd->dma_chan = NULL;
}
return 0;
}
static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct imx_pcm_dma_params *dma_params;
dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
return 0;
}
static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
dmaengine_submit(iprtd->desc);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
dmaengine_terminate_all(iprtd->dma_chan);
break;
default:
return -EINVAL;
}
return 0;
}
static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
pr_debug("%s: %ld %ld\n", __func__, iprtd->offset,
bytes_to_frames(substream->runtime, iprtd->offset));
return bytes_to_frames(substream->runtime, iprtd->offset);
}
static struct snd_pcm_hardware snd_imx_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_RESUME,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rate_min = 8000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
.period_bytes_min = 128,
.period_bytes_max = 65535, /* Limited by SDMA engine */
.periods_min = 2,
.periods_max = 255,
.fifo_size = 0,
};
static int snd_imx_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd;
int ret;
iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
if (iprtd == NULL)
return -ENOMEM;
runtime->private_data = iprtd;
ret = snd_pcm_hw_constraint_integer(substream->runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
if (ret < 0) {
kfree(iprtd);
return ret;
}
snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
return 0;
}
static int snd_imx_close(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct imx_pcm_runtime_data *iprtd = runtime->private_data;
kfree(iprtd);
return 0;
}
static struct snd_pcm_ops imx_pcm_ops = {
.open = snd_imx_open,
.close = snd_imx_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = snd_imx_pcm_hw_params,
.hw_free = snd_imx_pcm_hw_free,
.prepare = snd_imx_pcm_prepare,
.trigger = snd_imx_pcm_trigger,
.pointer = snd_imx_pcm_pointer,
.mmap = snd_imx_pcm_mmap,
};
static struct snd_soc_platform_driver imx_soc_platform_mx2 = {
.ops = &imx_pcm_ops,
.pcm_new = imx_pcm_new,
.pcm_free = imx_pcm_free,
};
static int __devinit imx_soc_platform_probe(struct platform_device *pdev)
{
struct imx_ssi *ssi = platform_get_drvdata(pdev);
ssi->dma_params_tx.burstsize = 6;
ssi->dma_params_rx.burstsize = 4;
return snd_soc_register_platform(&pdev->dev, &imx_soc_platform_mx2);
}
static int __devexit imx_soc_platform_remove(struct platform_device *pdev)
{
snd_soc_unregister_platform(&pdev->dev);
return 0;
}
static struct platform_driver imx_pcm_driver = {
.driver = {
.name = "imx-pcm-audio",
.owner = THIS_MODULE,
},
.probe = imx_soc_platform_probe,
.remove = __devexit_p(imx_soc_platform_remove),
};
static int __init snd_imx_pcm_init(void)
{
return platform_driver_register(&imx_pcm_driver);
}
module_init(snd_imx_pcm_init);
static void __exit snd_imx_pcm_exit(void)
{
platform_driver_unregister(&imx_pcm_driver);
}
module_exit(snd_imx_pcm_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:imx-pcm-audio");