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/*
* ALSA PCM interface for ST SPEAr Processors
*
* sound/soc/spear/spear_pcm.c
*
* Copyright (C) 2012 ST Microelectronics
* Rajeev Kumar<rajeev-dlh.kumar@st.com>
*
* 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/module.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/spear_dma.h>
struct snd_pcm_hardware spear_pcm_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),
.buffer_bytes_max = 16 * 1024, /* max buffer size */
.period_bytes_min = 2 * 1024, /* 1 msec data minimum period size */
.period_bytes_max = 2 * 1024, /* maximum period size */
.periods_min = 1, /* min # periods */
.periods_max = 8, /* max # of periods */
.fifo_size = 0, /* fifo size in bytes */
};
static int spear_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 spear_pcm_hw_free(struct snd_pcm_substream *substream)
{
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
}
static int spear_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct spear_dma_data *dma_data = (struct spear_dma_data *)
snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
int ret;
ret = snd_soc_set_runtime_hwparams(substream, &spear_pcm_hardware);
if (ret)
return ret;
ret = snd_dmaengine_pcm_open(substream, dma_data->filter, dma_data);
if (ret)
return ret;
snd_dmaengine_pcm_set_data(substream, dma_data);
return 0;
}
static int spear_pcm_close(struct snd_pcm_substream *substream)
{
snd_dmaengine_pcm_close(substream);
return 0;
}
static int spear_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 spear_pcm_ops = {
.open = spear_pcm_open,
.close = spear_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = spear_pcm_hw_params,
.hw_free = spear_pcm_hw_free,
.trigger = snd_dmaengine_pcm_trigger,
.pointer = snd_dmaengine_pcm_pointer,
.mmap = spear_pcm_mmap,
};
static int
spear_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream,
size_t size)
{
struct snd_pcm_substream *substream = pcm->streams[stream].substream;
struct snd_dma_buffer *buf = &substream->dma_buffer;
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);
if (!buf->area)
return -ENOMEM;
dev_info(buf->dev.dev,
" preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
(void *)buf->area, (void *)buf->addr, size);
buf->bytes = size;
return 0;
}
static void spear_pcm_free(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 || !buf->area)
continue;
dma_free_writecombine(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
}
}
static u64 spear_pcm_dmamask = DMA_BIT_MASK(32);
static int spear_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_card *card = rtd->card->snd_card;
int ret;
if (!card->dev->dma_mask)
card->dev->dma_mask = &spear_pcm_dmamask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
if (rtd->cpu_dai->driver->playback.channels_min) {
ret = spear_pcm_preallocate_dma_buffer(rtd->pcm,
SNDRV_PCM_STREAM_PLAYBACK,
spear_pcm_hardware.buffer_bytes_max);
if (ret)
return ret;
}
if (rtd->cpu_dai->driver->capture.channels_min) {
ret = spear_pcm_preallocate_dma_buffer(rtd->pcm,
SNDRV_PCM_STREAM_CAPTURE,
spear_pcm_hardware.buffer_bytes_max);
if (ret)
return ret;
}
return 0;
}
struct snd_soc_platform_driver spear_soc_platform = {
.ops = &spear_pcm_ops,
.pcm_new = spear_pcm_new,
.pcm_free = spear_pcm_free,
};
static int spear_soc_platform_probe(struct platform_device *pdev)
{
return snd_soc_register_platform(&pdev->dev, &spear_soc_platform);
}
static int spear_soc_platform_remove(struct platform_device *pdev)
{
snd_soc_unregister_platform(&pdev->dev);
return 0;
}
static struct platform_driver spear_pcm_driver = {
.driver = {
.name = "spear-pcm-audio",
.owner = THIS_MODULE,
},
.probe = spear_soc_platform_probe,
.remove = spear_soc_platform_remove,
};
module_platform_driver(spear_pcm_driver);
MODULE_AUTHOR("Rajeev Kumar <rajeev-dlh.kumar@st.com>");
MODULE_DESCRIPTION("SPEAr PCM DMA module");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:spear-pcm-audio");
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