mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-24 19:18:26 +02:00
113249c0a9
because hw_free can be called multiple times aswell. git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20373 3c298f89-4303-0410-b956-a3cf2f4a3e73
346 lines
8.6 KiB
C
346 lines
8.6 KiB
C
/*
|
|
* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/dma-mapping.h>
|
|
|
|
#include <sound/core.h>
|
|
#include <sound/pcm.h>
|
|
#include <sound/pcm_params.h>
|
|
#include <sound/soc.h>
|
|
|
|
#include <asm/mach-jz4740/dma.h>
|
|
#include "jz4740-pcm.h"
|
|
|
|
struct jz4740_runtime_data {
|
|
unsigned int dma_period;
|
|
dma_addr_t dma_start;
|
|
dma_addr_t dma_pos;
|
|
dma_addr_t dma_end;
|
|
|
|
struct jz4740_dma_chan *dma;
|
|
|
|
dma_addr_t fifo_addr;
|
|
};
|
|
|
|
/* identify hardware playback capabilities */
|
|
static const struct snd_pcm_hardware jz4740_pcm_hardware = {
|
|
.info = SNDRV_PCM_INFO_MMAP |
|
|
SNDRV_PCM_INFO_MMAP_VALID |
|
|
SNDRV_PCM_INFO_INTERLEAVED |
|
|
SNDRV_PCM_INFO_BLOCK_TRANSFER,
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE |
|
|
SNDRV_PCM_FMTBIT_S8,
|
|
.rates = SNDRV_PCM_RATE_8000_48000,
|
|
.channels_min = 1,
|
|
.channels_max = 2,
|
|
.period_bytes_min = 32,
|
|
.period_bytes_max = 2 * PAGE_SIZE,
|
|
.periods_min = 2,
|
|
.periods_max = 128,
|
|
.buffer_bytes_max = 128 * 2 * PAGE_SIZE,
|
|
.fifo_size = 32,
|
|
};
|
|
|
|
static void jz4740_pcm_start_transfer(struct jz4740_runtime_data *prtd, int stream)
|
|
{
|
|
unsigned int count;
|
|
|
|
if (prtd->dma_pos + prtd->dma_period > prtd->dma_end)
|
|
count = prtd->dma_end - prtd->dma_pos;
|
|
else
|
|
count = prtd->dma_period;
|
|
|
|
jz4740_dma_disable(prtd->dma);
|
|
|
|
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
|
jz4740_dma_set_src_addr(prtd->dma, prtd->dma_pos);
|
|
jz4740_dma_set_dst_addr(prtd->dma, prtd->fifo_addr);
|
|
} else {
|
|
jz4740_dma_set_src_addr(prtd->dma, prtd->fifo_addr);
|
|
jz4740_dma_set_dst_addr(prtd->dma, prtd->dma_pos);
|
|
}
|
|
|
|
jz4740_dma_set_transfer_count(prtd->dma, count);
|
|
|
|
jz4740_dma_enable(prtd->dma);
|
|
|
|
prtd->dma_pos += prtd->dma_period;
|
|
if (prtd->dma_pos >= prtd->dma_end)
|
|
prtd->dma_pos = prtd->dma_start;
|
|
}
|
|
|
|
static void jz4740_pcm_dma_transfer_done(struct jz4740_dma_chan *dma, int err,
|
|
void *dev_id)
|
|
{
|
|
struct snd_pcm_substream *substream = dev_id;
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct jz4740_runtime_data *prtd = runtime->private_data;
|
|
|
|
snd_pcm_period_elapsed(substream);
|
|
|
|
jz4740_pcm_start_transfer(prtd, substream->stream);
|
|
}
|
|
|
|
static int jz4740_pcm_hw_params(struct snd_pcm_substream *substream,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct jz4740_runtime_data *prtd = runtime->private_data;
|
|
struct snd_soc_pcm_runtime *rtd = substream->private_data;
|
|
struct jz4740_pcm_config *config;
|
|
|
|
config = rtd->dai->cpu_dai->dma_data;
|
|
if (!prtd->dma) {
|
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
|
prtd->dma = jz4740_dma_request(substream, "PCM Playback");
|
|
else
|
|
prtd->dma = jz4740_dma_request(substream, "PCM Capture");
|
|
}
|
|
|
|
if (!prtd->dma)
|
|
return -EBUSY;
|
|
|
|
jz4740_dma_configure(prtd->dma, config->dma_config);
|
|
prtd->fifo_addr = config->fifo_addr;
|
|
|
|
jz4740_dma_set_complete_cb(prtd->dma, jz4740_pcm_dma_transfer_done);
|
|
|
|
snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
|
|
runtime->dma_bytes = params_buffer_bytes(params);
|
|
|
|
prtd->dma_period = params_period_bytes(params);
|
|
prtd->dma_start = runtime->dma_addr;
|
|
prtd->dma_pos = prtd->dma_start;
|
|
prtd->dma_end = prtd->dma_start + runtime->dma_bytes;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int jz4740_pcm_hw_free(struct snd_pcm_substream *substream)
|
|
{
|
|
struct jz4740_runtime_data *prtd = substream->runtime->private_data;
|
|
|
|
snd_pcm_set_runtime_buffer(substream, NULL);
|
|
if (prtd->dma) {
|
|
jz4740_dma_free(prtd->dma);
|
|
prtd->dma = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int jz4740_pcm_prepare(struct snd_pcm_substream *substream)
|
|
{
|
|
struct jz4740_runtime_data *prtd = substream->runtime->private_data;
|
|
int ret = 0;
|
|
|
|
if (!prtd->dma)
|
|
return 0;
|
|
|
|
prtd->dma_pos = prtd->dma_start;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int jz4740_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct jz4740_runtime_data *prtd = runtime->private_data;
|
|
|
|
int ret = 0;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
jz4740_pcm_start_transfer(prtd, substream->stream);
|
|
break;
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
jz4740_dma_disable(prtd->dma);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static snd_pcm_uframes_t jz4740_pcm_pointer(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct jz4740_runtime_data *prtd = runtime->private_data;
|
|
unsigned long count, pos;
|
|
snd_pcm_uframes_t offset;
|
|
struct jz4740_dma_chan *dma = prtd->dma;
|
|
|
|
count = jz4740_dma_get_residue(dma);
|
|
if (prtd->dma_pos == prtd->dma_start)
|
|
pos = prtd->dma_end - prtd->dma_start - count;
|
|
else
|
|
pos = prtd->dma_pos - prtd->dma_start - count;
|
|
|
|
offset = bytes_to_frames(runtime, pos);
|
|
if (offset >= runtime->buffer_size)
|
|
offset = 0;
|
|
|
|
return offset;
|
|
}
|
|
|
|
static int jz4740_pcm_open(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct jz4740_runtime_data *prtd;
|
|
|
|
snd_soc_set_runtime_hwparams(substream, &jz4740_pcm_hardware);
|
|
prtd = kzalloc(sizeof(struct jz4740_runtime_data), GFP_KERNEL);
|
|
|
|
if (prtd == NULL)
|
|
return -ENOMEM;
|
|
|
|
runtime->private_data = prtd;
|
|
return 0;
|
|
}
|
|
|
|
static int jz4740_pcm_close(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
struct jz4740_runtime_data *prtd = runtime->private_data;
|
|
|
|
kfree(prtd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int jz4740_pcm_mmap(struct snd_pcm_substream *substream,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
return remap_pfn_range(vma, vma->vm_start,
|
|
substream->dma_buffer.addr >> PAGE_SHIFT,
|
|
vma->vm_end - vma->vm_start, vma->vm_page_prot);
|
|
}
|
|
|
|
static struct snd_pcm_ops jz4740_pcm_ops = {
|
|
.open = jz4740_pcm_open,
|
|
.close = jz4740_pcm_close,
|
|
.ioctl = snd_pcm_lib_ioctl,
|
|
.hw_params = jz4740_pcm_hw_params,
|
|
.hw_free = jz4740_pcm_hw_free,
|
|
.prepare = jz4740_pcm_prepare,
|
|
.trigger = jz4740_pcm_trigger,
|
|
.pointer = jz4740_pcm_pointer,
|
|
.mmap = jz4740_pcm_mmap,
|
|
};
|
|
|
|
static int jz4740_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 = jz4740_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_noncoherent(pcm->card->dev, size,
|
|
&buf->addr, GFP_KERNEL);
|
|
if (!buf->area)
|
|
return -ENOMEM;
|
|
|
|
buf->bytes = size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void jz4740_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->area)
|
|
continue;
|
|
|
|
dma_free_noncoherent(pcm->card->dev, buf->bytes,
|
|
buf->area, buf->addr);
|
|
buf->area = NULL;
|
|
}
|
|
}
|
|
|
|
static u64 jz4740_pcm_dmamask = DMA_BIT_MASK(32);
|
|
|
|
int jz4740_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
|
|
struct snd_pcm *pcm)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!card->dev->dma_mask)
|
|
card->dev->dma_mask = &jz4740_pcm_dmamask;
|
|
|
|
if (!card->dev->coherent_dma_mask)
|
|
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
|
|
|
|
if (dai->playback.channels_min) {
|
|
ret = jz4740_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_PLAYBACK);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
if (dai->capture.channels_min) {
|
|
ret = jz4740_pcm_preallocate_dma_buffer(pcm,
|
|
SNDRV_PCM_STREAM_CAPTURE);
|
|
if (ret)
|
|
goto err;
|
|
}
|
|
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
struct snd_soc_platform jz4740_soc_platform = {
|
|
.name = "jz4740-pcm",
|
|
.pcm_ops = &jz4740_pcm_ops,
|
|
.pcm_new = jz4740_pcm_new,
|
|
.pcm_free = jz4740_pcm_free,
|
|
};
|
|
EXPORT_SYMBOL_GPL(jz4740_soc_platform);
|
|
|
|
static int __init jz4740_soc_platform_init(void)
|
|
{
|
|
return snd_soc_register_platform(&jz4740_soc_platform);
|
|
}
|
|
module_init(jz4740_soc_platform_init);
|
|
|
|
static void __exit jz4740_soc_platform_exit(void)
|
|
{
|
|
snd_soc_unregister_platform(&jz4740_soc_platform);
|
|
}
|
|
module_exit(jz4740_soc_platform_exit);
|
|
|
|
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
|
|
MODULE_DESCRIPTION("Ingenic SoC JZ4740 PCM driver");
|
|
MODULE_LICENSE("GPL");
|