/*
* File: sound/soc/blackfin/bf5xx-tdm-pcm.c
* Author: Barry Song <Barry.Song@analog.com>
*
* Created: Tue June 06 2009
* Description: DMA driver for tdm codec
*
* Modified:
* Copyright 2009 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-tdm-pcm.h"
#include "bf5xx-tdm.h"
#include "bf5xx-sport.h"
#define PCM_BUFFER_MAX 0x10000
#define FRAGMENT_SIZE_MIN (4*1024)
#define FRAGMENTS_MIN 2
#define FRAGMENTS_MAX 32
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_BLOCK_TRANSFER |
SNDRV_PCM_INFO_RESUME),
.formats = SNDRV_PCM_FMTBIT_S32_LE,
.rates = SNDRV_PCM_RATE_48000,
.channels_min = 2,
.channels_max = 8,
.buffer_bytes_max = PCM_BUFFER_MAX,
.period_bytes_min = FRAGMENT_SIZE_MIN,
.period_bytes_max = PCM_BUFFER_MAX/2,
.periods_min = FRAGMENTS_MIN,
.periods_max = FRAGMENTS_MAX,
};
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 * 4);
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 fragsize_bytes = frames_to_bytes(runtime, runtime->period_size);
fragsize_bytes /= runtime->channels;
/* inflate the fragsize to match the dma width of SPORT */
fragsize_bytes *= 8;
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, fragsize_bytes);
} else {
sport_set_rx_callback(sport, bf5xx_dma_irq, substream);
sport_config_rx_dma(sport, runtime->dma_area,
runtime->periods, fragsize_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;
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;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
diff = sport_curr_offset_tx(sport);
frames = diff / (8*4); /* 32 bytes per frame */
} else {
diff = sport_curr_offset_rx(sport);
frames = diff / (8*4);
}
return frames;
}
static int bf5xx_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int ret = 0;
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");
ret = -ENODEV;
}
out:
return ret;
}
static int bf5xx_pcm_copy(struct snd_pcm_substream *substream, int channel,
snd_pcm_uframes_t pos, void *buf, snd_pcm_uframes_t count)
{
unsigned int *src;
unsigned int *dst;
int i;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
src = buf;
dst = (unsigned int *)substream->runtime->dma_area;
dst += pos * 8;
while (count--) {
for (i = 0; i < substream->runtime->channels; i++)
*(dst + i) = *src++;
dst += 8;
}
} else {
src = (unsigned int *)substream->runtime->dma_area;
dst = buf;
src += pos * 8;
while (count--) {
for (i = 0; i < substream->runtime->channels; i++)
*dst++ = *(src+i);
src += 8;
}
}
return 0;
}
static int bf5xx_pcm_silence(struct snd_pcm_substream *substream,
int channel, snd_pcm_uframes_t pos, snd_pcm_uframes_t count)
{
unsigned char *buf = substream->runtime->dma_area;
buf += pos * 8 * 4;
memset(buf, '\0', count * 8 * 4);
return 0;
}
struct snd_pcm_ops bf5xx_pcm_tdm_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,
.copy = bf5xx_pcm_copy,
.silence = bf5xx_pcm_silence,
};
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 * 4,
&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;
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_BIT_MASK(32);
static int bf5xx_pcm_tdm_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 = &bf5xx_pcm_dmamask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
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_tdm_soc_platform = {
.name = "bf5xx-audio",
.pcm_ops = &bf5xx_pcm_tdm_ops,
.pcm_new = bf5xx_pcm_tdm_new,
.pcm_free = bf5xx_pcm_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(bf5xx_tdm_soc_platform);
static int __init bfin_pcm_tdm_init(void)
{
return snd_soc_register_platform(&bf5xx_tdm_soc_platform);
}
module_init(bfin_pcm_tdm_init);
static void __exit bfin_pcm_tdm_exit(void)
{
snd_soc_unregister_platform(&bf5xx_tdm_soc_platform);
}
module_exit(bfin_pcm_tdm_exit);
MODULE_AUTHOR("Barry Song");
MODULE_DESCRIPTION("ADI Blackfin TDM PCM DMA module");
MODULE_LICENSE("GPL");
