![Nicolin Chen](/assets/img/avatar_default.png)
Since gen_pool_dma_alloc() is introduced, we implement it to simplify code. Signed-off-by: Nicolin Chen <b42378@freescale.com> Cc: Eric Miao <eric.y.miao@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
276 lines
6.7 KiB
C
276 lines
6.7 KiB
C
/*
|
|
* linux/sound/soc/pxa/mmp-pcm.c
|
|
*
|
|
* Copyright (C) 2011 Marvell International Ltd.
|
|
*
|
|
* 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/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/platform_data/dma-mmp_tdma.h>
|
|
#include <linux/platform_data/mmp_audio.h>
|
|
|
|
#include <sound/pxa2xx-lib.h>
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
#include <sound/dmaengine_pcm.h>
|
|
|
|
struct mmp_dma_data {
|
|
int ssp_id;
|
|
struct resource *dma_res;
|
|
};
|
|
|
|
#define MMP_PCM_INFO (SNDRV_PCM_INFO_MMAP | \
|
|
SNDRV_PCM_INFO_MMAP_VALID | \
|
|
SNDRV_PCM_INFO_INTERLEAVED | \
|
|
SNDRV_PCM_INFO_PAUSE | \
|
|
SNDRV_PCM_INFO_RESUME)
|
|
|
|
#define MMP_PCM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
|
|
SNDRV_PCM_FMTBIT_S24_LE | \
|
|
SNDRV_PCM_FMTBIT_S32_LE)
|
|
|
|
static struct snd_pcm_hardware mmp_pcm_hardware[] = {
|
|
{
|
|
.info = MMP_PCM_INFO,
|
|
.formats = MMP_PCM_FORMATS,
|
|
.period_bytes_min = 1024,
|
|
.period_bytes_max = 2048,
|
|
.periods_min = 2,
|
|
.periods_max = 32,
|
|
.buffer_bytes_max = 4096,
|
|
.fifo_size = 32,
|
|
},
|
|
{
|
|
.info = MMP_PCM_INFO,
|
|
.formats = MMP_PCM_FORMATS,
|
|
.period_bytes_min = 1024,
|
|
.period_bytes_max = 2048,
|
|
.periods_min = 2,
|
|
.periods_max = 32,
|
|
.buffer_bytes_max = 4096,
|
|
.fifo_size = 32,
|
|
},
|
|
};
|
|
|
|
static int mmp_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
struct dma_chan *chan = snd_dmaengine_pcm_get_chan(substream);
|
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
|
struct snd_dmaengine_dai_dma_data *dma_params;
|
|
struct dma_slave_config slave_config;
|
|
int ret;
|
|
|
|
dma_params = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
|
|
if (!dma_params)
|
|
return 0;
|
|
|
|
ret = snd_hwparams_to_dma_slave_config(substream, params, &slave_config);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
|
slave_config.dst_addr = dma_params->addr;
|
|
slave_config.dst_maxburst = 4;
|
|
} else {
|
|
slave_config.src_addr = dma_params->addr;
|
|
slave_config.src_maxburst = 4;
|
|
}
|
|
|
|
ret = dmaengine_slave_config(chan, &slave_config);
|
|
if (ret)
|
|
return ret;
|
|
|
|
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool filter(struct dma_chan *chan, void *param)
|
|
{
|
|
struct mmp_dma_data *dma_data = param;
|
|
bool found = false;
|
|
char *devname;
|
|
|
|
devname = kasprintf(GFP_KERNEL, "%s.%d", dma_data->dma_res->name,
|
|
dma_data->ssp_id);
|
|
if ((strcmp(dev_name(chan->device->dev), devname) == 0) &&
|
|
(chan->chan_id == dma_data->dma_res->start)) {
|
|
found = true;
|
|
}
|
|
|
|
kfree(devname);
|
|
return found;
|
|
}
|
|
|
|
static int mmp_pcm_open(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
|
struct platform_device *pdev = to_platform_device(rtd->platform->dev);
|
|
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
|
|
struct mmp_dma_data dma_data;
|
|
struct resource *r;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_DMA, substream->stream);
|
|
if (!r)
|
|
return -EBUSY;
|
|
|
|
snd_soc_set_runtime_hwparams(substream,
|
|
&mmp_pcm_hardware[substream->stream]);
|
|
|
|
dma_data.dma_res = r;
|
|
dma_data.ssp_id = cpu_dai->id;
|
|
|
|
return snd_dmaengine_pcm_open_request_chan(substream, filter,
|
|
&dma_data);
|
|
}
|
|
|
|
static int mmp_pcm_mmap(struct snd_pcm_substream *substream,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
unsigned long off = vma->vm_pgoff;
|
|
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
return remap_pfn_range(vma, vma->vm_start,
|
|
__phys_to_pfn(runtime->dma_addr) + off,
|
|
vma->vm_end - vma->vm_start, vma->vm_page_prot);
|
|
}
|
|
|
|
static struct snd_pcm_ops mmp_pcm_ops = {
|
|
.open = mmp_pcm_open,
|
|
.close = snd_dmaengine_pcm_close_release_chan,
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
.hw_params = mmp_pcm_hw_params,
|
|
.trigger = snd_dmaengine_pcm_trigger,
|
|
.pointer = snd_dmaengine_pcm_pointer,
|
|
.mmap = mmp_pcm_mmap,
|
|
};
|
|
|
|
static void mmp_pcm_free_dma_buffers(struct snd_pcm *pcm)
|
|
{
|
|
struct snd_pcm_substream *substream;
|
|
struct snd_dma_buffer *buf;
|
|
int stream;
|
|
struct gen_pool *gpool;
|
|
|
|
gpool = sram_get_gpool("asram");
|
|
if (!gpool)
|
|
return;
|
|
|
|
for (stream = 0; stream < 2; stream++) {
|
|
size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
|
|
|
|
substream = pcm->streams[stream].substream;
|
|
if (!substream)
|
|
continue;
|
|
|
|
buf = &substream->dma_buffer;
|
|
if (!buf->area)
|
|
continue;
|
|
gen_pool_free(gpool, (unsigned long)buf->area, size);
|
|
buf->area = NULL;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
static int mmp_pcm_preallocate_dma_buffer(struct snd_pcm_substream *substream,
|
|
int stream)
|
|
{
|
|
struct snd_dma_buffer *buf = &substream->dma_buffer;
|
|
size_t size = mmp_pcm_hardware[stream].buffer_bytes_max;
|
|
struct gen_pool *gpool;
|
|
|
|
buf->dev.type = SNDRV_DMA_TYPE_DEV;
|
|
buf->dev.dev = substream->pcm->card->dev;
|
|
buf->private_data = NULL;
|
|
|
|
gpool = sram_get_gpool("asram");
|
|
if (!gpool)
|
|
return -ENOMEM;
|
|
|
|
buf->area = gen_pool_dma_alloc(gpool, size, &buf->addr);
|
|
if (!buf->area)
|
|
return -ENOMEM;
|
|
buf->bytes = size;
|
|
return 0;
|
|
}
|
|
|
|
static int mmp_pcm_new(struct snd_soc_pcm_runtime *rtd)
|
|
{
|
|
struct snd_pcm_substream *substream;
|
|
struct snd_pcm *pcm = rtd->pcm;
|
|
int ret = 0, stream;
|
|
|
|
for (stream = 0; stream < 2; stream++) {
|
|
substream = pcm->streams[stream].substream;
|
|
|
|
ret = mmp_pcm_preallocate_dma_buffer(substream, stream);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err:
|
|
mmp_pcm_free_dma_buffers(pcm);
|
|
return ret;
|
|
}
|
|
|
|
static struct snd_soc_platform_driver mmp_soc_platform = {
|
|
.ops = &mmp_pcm_ops,
|
|
.pcm_new = mmp_pcm_new,
|
|
.pcm_free = mmp_pcm_free_dma_buffers,
|
|
};
|
|
|
|
static int mmp_pcm_probe(struct platform_device *pdev)
|
|
{
|
|
struct mmp_audio_platdata *pdata = pdev->dev.platform_data;
|
|
|
|
if (pdata) {
|
|
mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].buffer_bytes_max =
|
|
pdata->buffer_max_playback;
|
|
mmp_pcm_hardware[SNDRV_PCM_STREAM_PLAYBACK].period_bytes_max =
|
|
pdata->period_max_playback;
|
|
mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].buffer_bytes_max =
|
|
pdata->buffer_max_capture;
|
|
mmp_pcm_hardware[SNDRV_PCM_STREAM_CAPTURE].period_bytes_max =
|
|
pdata->period_max_capture;
|
|
}
|
|
return snd_soc_register_platform(&pdev->dev, &mmp_soc_platform);
|
|
}
|
|
|
|
static int mmp_pcm_remove(struct platform_device *pdev)
|
|
{
|
|
snd_soc_unregister_platform(&pdev->dev);
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver mmp_pcm_driver = {
|
|
.driver = {
|
|
.name = "mmp-pcm-audio",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
|
|
.probe = mmp_pcm_probe,
|
|
.remove = mmp_pcm_remove,
|
|
};
|
|
|
|
module_platform_driver(mmp_pcm_driver);
|
|
|
|
MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
|
|
MODULE_DESCRIPTION("MMP Soc Audio DMA module");
|
|
MODULE_LICENSE("GPL");
|