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DEFINITIONS
This source file includes following definitions.
- davinci_pcm_enqueue_dma
- davinci_pcm_dma_irq
- davinci_pcm_dma_request
- davinci_pcm_trigger
- davinci_pcm_prepare
- davinci_pcm_pointer
- davinci_pcm_open
- davinci_pcm_close
- davinci_pcm_hw_params
- davinci_pcm_hw_free
- davinci_pcm_mmap
- davinci_pcm_preallocate_dma_buffer
- davinci_pcm_free
- davinci_pcm_new
/*
* ALSA PCM interface for the TI DAVINCI processor
*
* Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
* Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
*
* 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.
*/
#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 "davinci-pcm.h"
#define DAVINCI_PCM_DEBUG 0
#if DAVINCI_PCM_DEBUG
#define DPRINTK(x...) printk(KERN_DEBUG x)
#else
#define DPRINTK(x...)
#endif
static struct snd_pcm_hardware davinci_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),
.formats = (SNDRV_PCM_FMTBIT_S16_LE),
.rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |
SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 |
SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
SNDRV_PCM_RATE_KNOT),
.rate_min = 8000,
.rate_max = 96000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = 128 * 1024,
.period_bytes_min = 32,
.period_bytes_max = 8 * 1024,
.periods_min = 16,
.periods_max = 255,
.fifo_size = 0,
};
struct davinci_runtime_data {
spinlock_t lock;
int period; /* current DMA period */
int master_lch; /* Master DMA channel */
int slave_lch; /* Slave DMA channel */
struct davinci_pcm_dma_params *params; /* DMA params */
};
static void davinci_pcm_enqueue_dma(struct snd_pcm_substream *substream)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
int lch = prtd->slave_lch;
unsigned int period_size;
unsigned int dma_offset;
dma_addr_t dma_pos;
dma_addr_t src, dst;
unsigned short src_bidx, dst_bidx;
unsigned int data_type;
unsigned int count;
period_size = snd_pcm_lib_period_bytes(substream);
dma_offset = prtd->period * period_size;
dma_pos = runtime->dma_addr + dma_offset;
DPRINTK("audio_set_dma_params_play channel = %d dma_ptr = %x "
"period_size=%x\n", lch, dma_pos, period_size);
data_type = prtd->params->data_type;
count = period_size / data_type;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
src = dma_pos;
dst = prtd->params->dma_addr;
src_bidx = data_type;
dst_bidx = 0;
} else {
src = prtd->params->dma_addr;
dst = dma_pos;
src_bidx = 0;
dst_bidx = data_type;
}
davinci_set_dma_src_params(lch, src, INCR, W8BIT);
davinci_set_dma_dest_params(lch, dst, INCR, W8BIT);
davinci_set_dma_src_index(lch, src_bidx, 0);
davinci_set_dma_dest_index(lch, dst_bidx, 0);
davinci_set_dma_transfer_params(lch, data_type, count, 1, 0, ASYNC);
prtd->period++;
if (unlikely(prtd->period >= runtime->periods))
prtd->period = 0;
}
static void davinci_pcm_dma_irq(int lch, u16 ch_status, void *data)
{
struct snd_pcm_substream *substream = data;
struct davinci_runtime_data *prtd = substream->runtime->private_data;
DPRINTK("lch=%d, status=0x%x\n", lch, ch_status);
if (unlikely(ch_status != DMA_COMPLETE))
return;
if (snd_pcm_running(substream)) {
snd_pcm_period_elapsed(substream);
spin_lock(&prtd->lock);
davinci_pcm_enqueue_dma(substream);
spin_unlock(&prtd->lock);
}
}
static int davinci_pcm_dma_request(struct snd_pcm_substream *substream)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct davinci_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
int tcc = TCC_ANY;
int ret;
if (!dma_data)
return -ENODEV;
prtd->params = dma_data;
/* Request master DMA channel */
ret = davinci_request_dma(prtd->params->channel, prtd->params->name,
davinci_pcm_dma_irq, substream,
&prtd->master_lch, &tcc, EVENTQ_0);
if (ret)
return ret;
/* Request slave DMA channel */
ret = davinci_request_dma(PARAM_ANY, "Link",
NULL, NULL, &prtd->slave_lch, &tcc, EVENTQ_0);
if (ret) {
davinci_free_dma(prtd->master_lch);
return ret;
}
/* Link slave DMA channel in loopback */
davinci_dma_link_lch(prtd->slave_lch, prtd->slave_lch);
return 0;
}
static int davinci_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
int ret = 0;
spin_lock(&prtd->lock);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
davinci_start_dma(prtd->master_lch);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
davinci_stop_dma(prtd->master_lch);
break;
default:
ret = -EINVAL;
break;
}
spin_unlock(&prtd->lock);
return ret;
}
static int davinci_pcm_prepare(struct snd_pcm_substream *substream)
{
struct davinci_runtime_data *prtd = substream->runtime->private_data;
struct paramentry_descriptor temp;
prtd->period = 0;
davinci_pcm_enqueue_dma(substream);
/* Get slave channel dma params for master channel startup */
davinci_get_dma_params(prtd->slave_lch, &temp);
davinci_set_dma_params(prtd->master_lch, &temp);
return 0;
}
static snd_pcm_uframes_t
davinci_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct davinci_runtime_data *prtd = runtime->private_data;
unsigned int offset;
dma_addr_t count;
dma_addr_t src, dst;
spin_lock(&prtd->lock);
davinci_dma_getposition(prtd->master_lch, &src, &dst);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
count = src - runtime->dma_addr;
else
count = dst - runtime->dma_addr;;
spin_unlock(&prtd->lock);
offset = bytes_to_frames(runtime, count);
if (offset >= runtime->buffer_size)
offset = 0;
return offset;
}
static int davinci_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct davinci_runtime_data *prtd;
int ret = 0;
snd_soc_set_runtime_hwparams(substream, &davinci_pcm_hardware);
prtd = kzalloc(sizeof(struct davinci_runtime_data), GFP_KERNEL);
if (prtd == NULL)
return -ENOMEM;
spin_lock_init(&prtd->lock);
runtime->private_data = prtd;
ret = davinci_pcm_dma_request(substream);
if (ret) {
printk(KERN_ERR "davinci_pcm: Failed to get dma channels\n");
kfree(prtd);
}
return ret;
}
static int davinci_pcm_close(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct davinci_runtime_data *prtd = runtime->private_data;
davinci_dma_unlink_lch(prtd->slave_lch, prtd->slave_lch);
davinci_free_dma(prtd->slave_lch);
davinci_free_dma(prtd->master_lch);
kfree(prtd);
return 0;
}
static int davinci_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
return snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
}
static int davinci_pcm_hw_free(struct snd_pcm_substream *substream)
{
return snd_pcm_lib_free_pages(substream);
}
static int davinci_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);
}
struct snd_pcm_ops davinci_pcm_ops = {
.open = davinci_pcm_open,
.close = davinci_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = davinci_pcm_hw_params,
.hw_free = davinci_pcm_hw_free,
.prepare = davinci_pcm_prepare,
.trigger = davinci_pcm_trigger,
.pointer = davinci_pcm_pointer,
.mmap = davinci_pcm_mmap,
};
static int davinci_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 = davinci_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_writecombine(pcm->card->dev, size,
&buf->addr, GFP_KERNEL);
DPRINTK("preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
(void *) buf->area, (void *) buf->addr, size);
if (!buf->area)
return -ENOMEM;
buf->bytes = size;
return 0;
}
static void davinci_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_writecombine(pcm->card->dev, buf->bytes,
buf->area, buf->addr);
buf->area = NULL;
}
}
static u64 davinci_pcm_dmamask = 0xffffffff;
static int davinci_pcm_new(struct snd_card *card,
struct snd_soc_dai *dai, struct snd_pcm *pcm)
{
int ret;
if (!card->dev->dma_mask)
card->dev->dma_mask = &davinci_pcm_dmamask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = 0xffffffff;
if (dai->playback.channels_min) {
ret = davinci_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_PLAYBACK);
if (ret)
return ret;
}
if (dai->capture.channels_min) {
ret = davinci_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_CAPTURE);
if (ret)
return ret;
}
return 0;
}
struct snd_soc_platform davinci_soc_platform = {
.name = "davinci-audio",
.pcm_ops = &davinci_pcm_ops,
.pcm_new = davinci_pcm_new,
.pcm_free = davinci_pcm_free,
};
EXPORT_SYMBOL_GPL(davinci_soc_platform);
MODULE_AUTHOR("Vladimir Barinov");
MODULE_DESCRIPTION("TI DAVINCI PCM DMA module");
MODULE_LICENSE("GPL");