sound: ASoC: Blackfin: DMA Driver for I2S sound chip
Signed-off-by: Cliff Cai <cliff.cai@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Cliff Cai
Jaroslav Kysela
parent
f2028623f2
commit
88740da15c
288
sound/soc/blackfin/bf5xx-i2s-pcm.c
Normal file
288
sound/soc/blackfin/bf5xx-i2s-pcm.c
Normal file
|
|
@ -0,0 +1,288 @@
|
|||
/*
|
||||
* File: sound/soc/blackfin/bf5xx-i2s-pcm.c
|
||||
* Author: Cliff Cai <Cliff.Cai@analog.com>
|
||||
*
|
||||
* Created: Tue June 06 2008
|
||||
* Description: DMA driver for i2s codec
|
||||
*
|
||||
* Modified:
|
||||
* Copyright 2008 Analog Devices Inc.
|
||||
*
|
||||
* Bugs: Enter bugs at http://blackfin.uclinux.org/
|
||||
*
|
||||
* 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.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, see the file COPYING, or write
|
||||
* to the Free Software Foundation, Inc.,
|
||||
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/slab.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/dma.h>
|
||||
|
||||
#include "bf5xx-i2s-pcm.h"
|
||||
#include "bf5xx-i2s.h"
|
||||
#include "bf5xx-sport.h"
|
||||
|
||||
static void bf5xx_dma_irq(void *data)
|
||||
{
|
||||
struct snd_pcm_substream *pcm = data;
|
||||
snd_pcm_period_elapsed(pcm);
|
||||
}
|
||||
|
||||
static const struct snd_pcm_hardware bf5xx_pcm_hardware = {
|
||||
.info = SNDRV_PCM_INFO_INTERLEAVED |
|
||||
SNDRV_PCM_INFO_MMAP |
|
||||
SNDRV_PCM_INFO_MMAP_VALID |
|
||||
SNDRV_PCM_INFO_BLOCK_TRANSFER,
|
||||
.formats = SNDRV_PCM_FMTBIT_S16_LE |
|
||||
SNDRV_PCM_FMTBIT_S24_LE |
|
||||
SNDRV_PCM_FMTBIT_S32_LE,
|
||||
.period_bytes_min = 32,
|
||||
.period_bytes_max = 0x10000,
|
||||
.periods_min = 1,
|
||||
.periods_max = PAGE_SIZE/32,
|
||||
.buffer_bytes_max = 0x20000, /* 128 kbytes */
|
||||
.fifo_size = 16,
|
||||
};
|
||||
|
||||
static int bf5xx_pcm_hw_params(struct snd_pcm_substream *substream,
|
||||
struct snd_pcm_hw_params *params)
|
||||
{
|
||||
size_t size = bf5xx_pcm_hardware.buffer_bytes_max;
|
||||
snd_pcm_lib_malloc_pages(substream, size);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bf5xx_pcm_hw_free(struct snd_pcm_substream *substream)
|
||||
{
|
||||
snd_pcm_lib_free_pages(substream);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bf5xx_pcm_prepare(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct sport_device *sport = runtime->private_data;
|
||||
int period_bytes = frames_to_bytes(runtime, runtime->period_size);
|
||||
|
||||
pr_debug("%s enter\n", __func__);
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
||||
sport_set_tx_callback(sport, bf5xx_dma_irq, substream);
|
||||
sport_config_tx_dma(sport, runtime->dma_area,
|
||||
runtime->periods, period_bytes);
|
||||
} else {
|
||||
sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
|
||||
sport_config_rx_dma(sport, runtime->dma_area,
|
||||
runtime->periods, period_bytes);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bf5xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct sport_device *sport = runtime->private_data;
|
||||
int ret = 0;
|
||||
|
||||
pr_debug("%s enter\n", __func__);
|
||||
switch (cmd) {
|
||||
case SNDRV_PCM_TRIGGER_START:
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||||
sport_tx_start(sport);
|
||||
else
|
||||
sport_rx_start(sport);
|
||||
break;
|
||||
case SNDRV_PCM_TRIGGER_STOP:
|
||||
case SNDRV_PCM_TRIGGER_SUSPEND:
|
||||
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||||
sport_tx_stop(sport);
|
||||
else
|
||||
sport_rx_stop(sport);
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static snd_pcm_uframes_t bf5xx_pcm_pointer(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
struct sport_device *sport = runtime->private_data;
|
||||
unsigned int diff;
|
||||
snd_pcm_uframes_t frames;
|
||||
pr_debug("%s enter\n", __func__);
|
||||
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
|
||||
diff = sport_curr_offset_tx(sport);
|
||||
frames = bytes_to_frames(substream->runtime, diff);
|
||||
} else {
|
||||
diff = sport_curr_offset_rx(sport);
|
||||
frames = bytes_to_frames(substream->runtime, diff);
|
||||
}
|
||||
return frames;
|
||||
}
|
||||
|
||||
static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
int ret;
|
||||
|
||||
pr_debug("%s enter\n", __func__);
|
||||
snd_soc_set_runtime_hwparams(substream, &bf5xx_pcm_hardware);
|
||||
|
||||
ret = snd_pcm_hw_constraint_integer(runtime, \
|
||||
SNDRV_PCM_HW_PARAM_PERIODS);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
|
||||
if (sport_handle != NULL)
|
||||
runtime->private_data = sport_handle;
|
||||
else {
|
||||
pr_err("sport_handle is NULL\n");
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int bf5xx_pcm_mmap(struct snd_pcm_substream *substream,
|
||||
struct vm_area_struct *vma)
|
||||
{
|
||||
struct snd_pcm_runtime *runtime = substream->runtime;
|
||||
size_t size = vma->vm_end - vma->vm_start;
|
||||
vma->vm_start = (unsigned long)runtime->dma_area;
|
||||
vma->vm_end = vma->vm_start + size;
|
||||
vma->vm_flags |= VM_SHARED;
|
||||
|
||||
return 0 ;
|
||||
}
|
||||
|
||||
struct snd_pcm_ops bf5xx_pcm_i2s_ops = {
|
||||
.open = bf5xx_pcm_open,
|
||||
.ioctl = snd_pcm_lib_ioctl,
|
||||
.hw_params = bf5xx_pcm_hw_params,
|
||||
.hw_free = bf5xx_pcm_hw_free,
|
||||
.prepare = bf5xx_pcm_prepare,
|
||||
.trigger = bf5xx_pcm_trigger,
|
||||
.pointer = bf5xx_pcm_pointer,
|
||||
.mmap = bf5xx_pcm_mmap,
|
||||
};
|
||||
|
||||
static int bf5xx_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 = bf5xx_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_coherent(pcm->card->dev, size,
|
||||
&buf->addr, GFP_KERNEL);
|
||||
if (!buf->area) {
|
||||
pr_err("Failed to allocate dma memory \
|
||||
Please increase uncached DMA memory region\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
buf->bytes = size;
|
||||
|
||||
pr_debug("%s, area:%p, size:0x%08lx\n", __func__,
|
||||
buf->area, buf->bytes);
|
||||
|
||||
if (stream == SNDRV_PCM_STREAM_PLAYBACK)
|
||||
sport_handle->tx_buf = buf->area;
|
||||
else
|
||||
sport_handle->rx_buf = buf->area;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void bf5xx_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_coherent(NULL, buf->bytes, buf->area, 0);
|
||||
buf->area = NULL;
|
||||
}
|
||||
if (sport_handle)
|
||||
sport_done(sport_handle);
|
||||
}
|
||||
|
||||
static u64 bf5xx_pcm_dmamask = DMA_32BIT_MASK;
|
||||
|
||||
int bf5xx_pcm_i2s_new(struct snd_card *card, struct snd_soc_dai *dai,
|
||||
struct snd_pcm *pcm)
|
||||
{
|
||||
int ret = 0;
|
||||
|
||||
pr_debug("%s enter\n", __func__);
|
||||
if (!card->dev->dma_mask)
|
||||
card->dev->dma_mask = &bf5xx_pcm_dmamask;
|
||||
if (!card->dev->coherent_dma_mask)
|
||||
card->dev->coherent_dma_mask = DMA_32BIT_MASK;
|
||||
|
||||
if (dai->playback.channels_min) {
|
||||
ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_PLAYBACK);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (dai->capture.channels_min) {
|
||||
ret = bf5xx_pcm_preallocate_dma_buffer(pcm,
|
||||
SNDRV_PCM_STREAM_CAPTURE);
|
||||
if (ret)
|
||||
goto out;
|
||||
}
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
struct snd_soc_platform bf5xx_i2s_soc_platform = {
|
||||
.name = "bf5xx-audio",
|
||||
.pcm_ops = &bf5xx_pcm_i2s_ops,
|
||||
.pcm_new = bf5xx_pcm_i2s_new,
|
||||
.pcm_free = bf5xx_pcm_free_dma_buffers,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(bf5xx_i2s_soc_platform);
|
||||
|
||||
MODULE_AUTHOR("Cliff Cai");
|
||||
MODULE_DESCRIPTION("ADI Blackfin I2S PCM DMA module");
|
||||
MODULE_LICENSE("GPL");
|
||||
29
sound/soc/blackfin/bf5xx-i2s-pcm.h
Normal file
29
sound/soc/blackfin/bf5xx-i2s-pcm.h
Normal file
|
|
@ -0,0 +1,29 @@
|
|||
/*
|
||||
* linux/sound/arm/bf5xx-i2s-pcm.h -- ALSA PCM interface for the Blackfin
|
||||
*
|
||||
* Copyright 2007 Analog Device Inc.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#ifndef _BF5XX_I2S_PCM_H
|
||||
#define _BF5XX_I2S_PCM_H
|
||||
|
||||
struct bf5xx_pcm_dma_params {
|
||||
char *name; /* stream identifier */
|
||||
};
|
||||
|
||||
struct bf5xx_gpio {
|
||||
u32 sys;
|
||||
u32 rx;
|
||||
u32 tx;
|
||||
u32 clk;
|
||||
u32 frm;
|
||||
};
|
||||
|
||||
/* platform data */
|
||||
extern struct snd_soc_platform bf5xx_i2s_soc_platform;
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user