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|
/*
* tegra_pcm.c -- ALSA Soc Audio Layer
*
* (c) 2010 Nvidia Graphics Pvt. Ltd.
* http://www.nvidia.com
*
* (c) 2006 Wolfson Microelectronics PLC.
* Graeme Gregory graeme.gregory@wolfsonmicro.com or linux@wolfsonmicro.com
*
* (c) 2004-2005 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* 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.
*/
#include "tegra_soc.h"
#include <mach/tegra_das.h>
#define PLAYBACK_STARTED true
#define PLAYBACK_STOPPED false
static void tegra_pcm_play(struct tegra_runtime_data *prtd)
{
static int reqid = 0;
struct snd_pcm_substream *substream = prtd->substream;
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_dma_buffer *buf = &substream->dma_buffer;
if (runtime->dma_addr) {
prtd->size = frames_to_bytes(runtime, runtime->period_size);
if (reqid == 0) {
if (prtd->dma_state != STATE_ABORT) {
prtd->dma_req1.source_addr = buf->addr +
frames_to_bytes(runtime,prtd->dma_pos);
prtd->dma_req1.size = prtd->size;
tegra_dma_enqueue_req(prtd->dma_chan,
&prtd->dma_req1);
reqid = 1;
}
} else {
if (prtd->dma_state != STATE_ABORT) {
prtd->dma_req2.source_addr = buf->addr +
frames_to_bytes(runtime,prtd->dma_pos);
prtd->dma_req2.size = prtd->size;
tegra_dma_enqueue_req(prtd->dma_chan,
&prtd->dma_req2);
reqid = 0;
}
}
}
prtd->dma_pos += runtime->period_size;
if (prtd->dma_pos >= runtime->buffer_size) {
prtd->dma_pos = 0;
}
}
static void tegra_pcm_capture(struct tegra_runtime_data *prtd)
{
static int reqid = 0;
struct snd_pcm_substream *substream = prtd->substream;
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_dma_buffer *buf = &substream->dma_buffer;
if (runtime->dma_addr) {
prtd->size = frames_to_bytes(runtime, runtime->period_size);
if (reqid == 0) {
if (prtd->dma_state != STATE_ABORT) {
prtd->dma_req1.dest_addr = buf->addr +
frames_to_bytes(runtime,prtd->dma_pos);
prtd->dma_req1.size = prtd->size;
tegra_dma_enqueue_req(prtd->dma_chan,
&prtd->dma_req1);
reqid = 1;
}
} else {
if (prtd->dma_state != STATE_ABORT) {
prtd->dma_req2.dest_addr = buf->addr +
frames_to_bytes(runtime,prtd->dma_pos);
prtd->dma_req2.size = prtd->size;
tegra_dma_enqueue_req(prtd->dma_chan,
&prtd->dma_req2);
reqid = 0;
}
}
}
prtd->dma_pos += runtime->period_size;
if (prtd->dma_pos >= runtime->buffer_size) {
prtd->dma_pos = 0;
}
}
static void dma_complete_callback (struct tegra_dma_req *req)
{
struct tegra_runtime_data *prtd = (struct tegra_runtime_data *)req->dev;
struct snd_pcm_substream *substream = prtd->substream;
struct snd_pcm_runtime *runtime = substream->runtime;
if (++prtd->period_index >= runtime->periods) {
prtd->period_index = 0;
}
if (prtd->dma_state != STATE_ABORT) {
snd_pcm_period_elapsed(substream);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
tegra_pcm_play(prtd);
} else {
tegra_pcm_capture(prtd);
}
}
}
static const struct snd_pcm_hardware tegra_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED | \
SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME | \
SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID ,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.channels_min = 1,
.channels_max = 2,
.buffer_bytes_max = (PAGE_SIZE * 8),
.period_bytes_min = 128,
.period_bytes_max = (PAGE_SIZE),
.periods_min = 2,
.periods_max = 8,
.fifo_size = 4,
};
static int tegra_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 tegra_pcm_hw_free(struct snd_pcm_substream *substream)
{
snd_pcm_set_runtime_buffer(substream, NULL);
return 0;
}
static int tegra_pcm_prepare(struct snd_pcm_substream *substream)
{
struct tegra_runtime_data *prtd = substream->runtime->private_data;
prtd->dma_pos = 0;
prtd->period_index = 0;
return 0;
}
static int tegra_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct tegra_runtime_data *prtd = substream->runtime->private_data;
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
prtd->state = STATE_INIT;
prtd->dma_state = STATE_INIT;
tegra_pcm_play(prtd); /* dma enqueue req1 */
tegra_pcm_play(prtd); /* dma enqueue req2 */
} else if (prtd->state != STATE_INIT) {
/* start recording */
prtd->state = STATE_INIT;
prtd->dma_state = STATE_INIT;
tegra_pcm_capture(prtd); /* dma enqueue req1 */
tegra_pcm_capture(prtd); /* dma enqueue req2 */
}
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
prtd->state = STATE_ABORT;
prtd->dma_state = STATE_ABORT;
tegra_dma_cancel(prtd->dma_chan);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (prtd->dma_chan) {
tegra_dma_dequeue_req(prtd->dma_chan,
&prtd->dma_req1);
tegra_dma_dequeue_req(prtd->dma_chan,
&prtd->dma_req2);
}
} else {
if (prtd->dma_chan) {
tegra_dma_dequeue_req(prtd->dma_chan,
&prtd->dma_req1);
tegra_dma_dequeue_req(prtd->dma_chan,
&prtd->dma_req2);
}
}
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static snd_pcm_uframes_t tegra_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct tegra_runtime_data *prtd = runtime->private_data;
int size;
size = prtd->period_index * runtime->period_size;
return (size);
}
static int tegra_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct tegra_runtime_data *prtd = 0;
int ret=0;
/* Ensure period size is multiple of minimum DMA step size */
ret = snd_pcm_hw_constraint_step(runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, DMA_STEP_SIZE_MIN);
if (ret < 0) {
pr_err("%s:snd_pcm_hw_constraint_step failed: %d\n",
__func__, ret);
goto fail;
}
/* Ensure buffer size is multiple of period size */
ret = snd_pcm_hw_constraint_integer(runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
if (ret < 0) {
pr_err("%s:snd_pcm_hw_constraint_integer failed: %d\n",
__func__, ret);
goto fail;
}
prtd = kzalloc(sizeof(struct tegra_runtime_data), GFP_KERNEL);
if (prtd == NULL)
return -ENOMEM;
memset(prtd, 0, sizeof(*prtd));
runtime->private_data = prtd;
prtd->substream = substream;
/* set pins state to normal */
tegra_das_power_mode(true);
prtd->state = STATE_INVALID;
setup_dma_request(substream,
&prtd->dma_req1,
dma_complete_callback,
prtd);
setup_dma_request(substream,
&prtd->dma_req2,
dma_complete_callback,
prtd);
prtd->dma_chan = tegra_dma_allocate_channel(TEGRA_DMA_MODE_CONTINUOUS_DOUBLE);
if (IS_ERR(prtd->dma_chan)) {
pr_err("%s: could not allocate DMA channel for I2S: %ld\n",
__func__, PTR_ERR(prtd->dma_chan));
ret = PTR_ERR(prtd->dma_chan);
goto fail;
}
/* Set HW params now that initialization is complete */
snd_soc_set_runtime_hwparams(substream, &tegra_pcm_hardware);
goto end;
fail:
if (prtd) {
prtd->state = STATE_EXIT;
if (prtd->dma_chan) {
tegra_dma_flush(prtd->dma_chan);
tegra_dma_free_channel(prtd->dma_chan);
}
/* set pins state to tristate */
tegra_das_power_mode(false);
kfree(prtd);
}
end:
return ret;
}
static int tegra_pcm_close(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct tegra_runtime_data *prtd = runtime->private_data;
if (!prtd) {
printk(KERN_ERR "tegra_pcm_close called with prtd == NULL\n");
return 0;
}
prtd->state = STATE_EXIT;
if (prtd->dma_chan) {
prtd->dma_state = STATE_EXIT;
tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req1);
tegra_dma_dequeue_req(prtd->dma_chan, &prtd->dma_req2);
tegra_dma_flush(prtd->dma_chan);
tegra_dma_free_channel(prtd->dma_chan);
prtd->dma_chan = NULL;
}
/* set pins state to tristate */
tegra_das_power_mode(false);
kfree(prtd);
return 0;
}
static int tegra_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 tegra_pcm_ops = {
.open = tegra_pcm_open,
.close = tegra_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = tegra_pcm_hw_params,
.hw_free = tegra_pcm_hw_free,
.prepare = tegra_pcm_prepare,
.trigger = tegra_pcm_trigger,
.pointer = tegra_pcm_pointer,
.mmap = tegra_pcm_mmap,
};
static int tegra_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 = tegra_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);
buf->bytes = size;
return 0;
}
static void tegra_pcm_deallocate_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;
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 void tegra_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;
buf = &substream->dma_buffer;
if (!buf) {
printk(KERN_ERR "no buffer %d \n",stream);
continue;
}
tegra_pcm_deallocate_dma_buffer(pcm ,stream);
}
}
static u64 tegra_dma_mask = DMA_BIT_MASK(32);
static int tegra_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 = &tegra_dma_mask;
if (!card->dev->coherent_dma_mask)
card->dev->coherent_dma_mask = 0xffffffff;
if (dai->playback.channels_min) {
ret = tegra_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_PLAYBACK);
if (ret)
goto out;
}
if (dai->capture.channels_min) {
ret = tegra_pcm_preallocate_dma_buffer(pcm,
SNDRV_PCM_STREAM_CAPTURE);
if (ret)
goto out;
}
out:
return ret;
}
struct snd_soc_platform tegra_soc_platform = {
.name = "tegra-audio",
.pcm_ops = &tegra_pcm_ops,
.pcm_new = tegra_pcm_new,
.pcm_free = tegra_pcm_free_dma_buffers,
};
EXPORT_SYMBOL_GPL(tegra_soc_platform);
static int __init tegra_soc_platform_init(void)
{
return snd_soc_register_platform(&tegra_soc_platform);
}
module_init(tegra_soc_platform_init);
static void __exit tegra_soc_platform_exit(void)
{
snd_soc_unregister_platform(&tegra_soc_platform);
}
module_exit(tegra_soc_platform_exit);
MODULE_DESCRIPTION("Tegra PCM DMA module");
MODULE_LICENSE("GPL");
|