mirror of https://gitee.com/openkylin/linux.git
243 lines
6.1 KiB
C
243 lines
6.1 KiB
C
/*
|
|
* linux/sound/arm/ep93xx-pcm.c - EP93xx ALSA PCM interface
|
|
*
|
|
* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
|
|
* Copyright (C) 2006 Applied Data Systems
|
|
*
|
|
* Rewritten for the SoC audio subsystem (Based on PXA2xx code):
|
|
* Copyright (c) 2008 Ryan Mallon
|
|
*
|
|
* 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 <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/dma-mapping.h>
|
|
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
#include <sound/dmaengine_pcm.h>
|
|
|
|
#include <linux/platform_data/dma-ep93xx.h>
|
|
#include <mach/hardware.h>
|
|
#include <mach/ep93xx-regs.h>
|
|
|
|
#include "ep93xx-pcm.h"
|
|
|
|
static const struct snd_pcm_hardware ep93xx_pcm_hardware = {
|
|
.info = (SNDRV_PCM_INFO_MMAP |
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
|
SNDRV_PCM_INFO_BLOCK_TRANSFER),
|
|
|
|
.rates = SNDRV_PCM_RATE_8000_192000,
|
|
.rate_min = SNDRV_PCM_RATE_8000,
|
|
.rate_max = SNDRV_PCM_RATE_192000,
|
|
|
|
.formats = (SNDRV_PCM_FMTBIT_S16_LE |
|
|
SNDRV_PCM_FMTBIT_S24_LE |
|
|
SNDRV_PCM_FMTBIT_S32_LE),
|
|
|
|
.buffer_bytes_max = 131072,
|
|
.period_bytes_min = 32,
|
|
.period_bytes_max = 32768,
|
|
.periods_min = 1,
|
|
.periods_max = 32,
|
|
.fifo_size = 32,
|
|
};
|
|
|
|
static bool ep93xx_pcm_dma_filter(struct dma_chan *chan, void *filter_param)
|
|
{
|
|
struct ep93xx_dma_data *data = filter_param;
|
|
|
|
if (data->direction == ep93xx_dma_chan_direction(chan)) {
|
|
chan->private = data;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static int ep93xx_pcm_open(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
|
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
|
|
struct ep93xx_pcm_dma_params *dma_params;
|
|
struct ep93xx_dma_data *dma_data;
|
|
int ret;
|
|
|
|
snd_soc_set_runtime_hwparams(substream, &ep93xx_pcm_hardware);
|
|
|
|
dma_data = kmalloc(sizeof(*dma_data), GFP_KERNEL);
|
|
if (!dma_data)
|
|
return -ENOMEM;
|
|
|
|
dma_params = snd_soc_dai_get_dma_data(cpu_dai, substream);
|
|
dma_data->port = dma_params->dma_port;
|
|
dma_data->name = dma_params->name;
|
|
dma_data->direction = snd_pcm_substream_to_dma_direction(substream);
|
|
|
|
ret = snd_dmaengine_pcm_open(substream, ep93xx_pcm_dma_filter, dma_data);
|
|
if (ret) {
|
|
kfree(dma_data);
|
|
return ret;
|
|
}
|
|
|
|
snd_dmaengine_pcm_set_data(substream, dma_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ep93xx_pcm_close(struct snd_pcm_substream *substream)
|
|
{
|
|
struct dma_data *dma_data = snd_dmaengine_pcm_get_data(substream);
|
|
|
|
snd_dmaengine_pcm_close(substream);
|
|
kfree(dma_data);
|
|
return 0;
|
|
}
|
|
|
|
static int ep93xx_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ep93xx_pcm_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
snd_pcm_set_runtime_buffer(substream, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static int ep93xx_pcm_mmap(struct snd_pcm_substream *substream,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
return dma_mmap_writecombine(substream->pcm->card->dev, vma,
|
|
runtime->dma_area,
|
|
runtime->dma_addr,
|
|
runtime->dma_bytes);
|
|
}
|
|
|
|
static struct snd_pcm_ops ep93xx_pcm_ops = {
|
|
.open = ep93xx_pcm_open,
|
|
.close = ep93xx_pcm_close,
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
.hw_params = ep93xx_pcm_hw_params,
|
|
.hw_free = ep93xx_pcm_hw_free,
|
|
.trigger = snd_dmaengine_pcm_trigger,
|
|
.pointer = snd_dmaengine_pcm_pointer_no_residue,
|
|
.mmap = ep93xx_pcm_mmap,
|
|
};
|
|
|
|
static int ep93xx_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 = ep93xx_pcm_hardware.buffer_bytes_max;
|
|
|
|
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);
|
|
buf->bytes = size;
|
|
|
|
return (buf->area == NULL) ? -ENOMEM : 0;
|
|
}
|
|
|
|
static void ep93xx_pcm_free_dma_buffers(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;
|
|
}
|
|
}
|
|
|
|
static u64 ep93xx_pcm_dmamask = DMA_BIT_MASK(32);
|
|
|
|
static int ep93xx_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 = &ep93xx_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 = ep93xx_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
|
|
ret = ep93xx_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct snd_soc_platform_driver ep93xx_soc_platform = {
|
|
.ops = &ep93xx_pcm_ops,
|
|
.pcm_new = &ep93xx_pcm_new,
|
|
.pcm_free = &ep93xx_pcm_free_dma_buffers,
|
|
};
|
|
|
|
static int __devinit ep93xx_soc_platform_probe(struct platform_device *pdev)
|
|
{
|
|
return snd_soc_register_platform(&pdev->dev, &ep93xx_soc_platform);
|
|
}
|
|
|
|
static int __devexit ep93xx_soc_platform_remove(struct platform_device *pdev)
|
|
{
|
|
snd_soc_unregister_platform(&pdev->dev);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ep93xx_pcm_driver = {
|
|
.driver = {
|
|
.name = "ep93xx-pcm-audio",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
|
|
.probe = ep93xx_soc_platform_probe,
|
|
.remove = __devexit_p(ep93xx_soc_platform_remove),
|
|
};
|
|
|
|
module_platform_driver(ep93xx_pcm_driver);
|
|
|
|
MODULE_AUTHOR("Ryan Mallon");
|
|
MODULE_DESCRIPTION("EP93xx ALSA PCM interface");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:ep93xx-pcm-audio");
|