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/*
* Intel Baytrail SST PCM Support
* Copyright (c) 2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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.
*/
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include "sst-baytrail-ipc.h"
#include "../common/sst-dsp-priv.h"
#include "../common/sst-dsp.h"
#define BYT_PCM_COUNT 2
static const struct snd_pcm_hardware sst_byt_pcm_hardware = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_PAUSE |
SNDRV_PCM_INFO_RESUME,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S24_LE,
.period_bytes_min = 384,
.period_bytes_max = 48000,
.periods_min = 2,
.periods_max = 250,
.buffer_bytes_max = 96000,
};
/* private data for each PCM DSP stream */
struct sst_byt_pcm_data {
struct sst_byt_stream *stream;
struct snd_pcm_substream *substream;
struct mutex mutex;
/* latest DSP DMA hw pointer */
u32 hw_ptr;
struct work_struct work;
};
/* private data for the driver */
struct sst_byt_priv_data {
/* runtime DSP */
struct sst_byt *byt;
/* DAI data */
struct sst_byt_pcm_data pcm[BYT_PCM_COUNT];
/* flag indicating is stream context restore needed after suspend */
bool restore_stream;
};
/* this may get called several times by oss emulation */
static int sst_byt_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct sst_byt_priv_data *pdata =
snd_soc_platform_get_drvdata(rtd->platform);
struct sst_byt_pcm_data *pcm_data = &pdata->pcm[substream->stream];
struct sst_byt *byt = pdata->byt;
u32 rate, bits;
u8 channels;
int ret, playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
dev_dbg(rtd->dev, "PCM: hw_params, pcm_data %p\n", pcm_data);
ret = sst_byt_stream_type(byt, pcm_data->stream,
1, 1, !playback);
if (ret < 0) {
dev_err(rtd->dev, "failed to set stream format %d\n", ret);
return ret;
}
rate = params_rate(params);
ret = sst_byt_stream_set_rate(byt, pcm_data->stream, rate);
if (ret < 0) {
dev_err(rtd->dev, "could not set rate %d\n", rate);
return ret;
}
bits = snd_pcm_format_width(params_format(params));
ret = sst_byt_stream_set_bits(byt, pcm_data->stream, bits);
if (ret < 0) {
dev_err(rtd->dev, "could not set formats %d\n",
params_rate(params));
return ret;
}
channels = (u8)(params_channels(params) & 0xF);
ret = sst_byt_stream_set_channels(byt, pcm_data->stream, channels);
if (ret < 0) {
dev_err(rtd->dev, "could not set channels %d\n",
params_rate(params));
return ret;
}
snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
ret = sst_byt_stream_buffer(byt, pcm_data->stream,
substream->dma_buffer.addr,
params_buffer_bytes(params));
if (ret < 0) {
dev_err(rtd->dev, "PCM: failed to set DMA buffer %d\n", ret);
return ret;
}
ret = sst_byt_stream_commit(byt, pcm_data->stream);
if (ret < 0) {
dev_err(rtd->dev, "PCM: failed stream commit %d\n", ret);
return ret;
}
return 0;
}
static int sst_byt_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
dev_dbg(rtd->dev, "PCM: hw_free\n");
snd_pcm_lib_free_pages(substream);
return 0;
}
static int sst_byt_pcm_restore_stream_context(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct sst_byt_priv_data *pdata =
snd_soc_platform_get_drvdata(rtd->platform);
struct sst_byt_pcm_data *pcm_data = &pdata->pcm[substream->stream];
struct sst_byt *byt = pdata->byt;
int ret;
/* commit stream using existing stream params */
ret = sst_byt_stream_commit(byt, pcm_data->stream);
if (ret < 0) {
dev_err(rtd->dev, "PCM: failed stream commit %d\n", ret);
return ret;
}
sst_byt_stream_start(byt, pcm_data->stream, pcm_data->hw_ptr);
dev_dbg(rtd->dev, "stream context restored at offset %d\n",
pcm_data->hw_ptr);
return 0;
}
static void sst_byt_pcm_work(struct work_struct *work)
{
struct sst_byt_pcm_data *pcm_data =
container_of(work, struct sst_byt_pcm_data, work);
if (snd_pcm_running(pcm_data->substream))
sst_byt_pcm_restore_stream_context(pcm_data->substream);
}
static int sst_byt_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct sst_byt_priv_data *pdata =
snd_soc_platform_get_drvdata(rtd->platform);
struct sst_byt_pcm_data *pcm_data = &pdata->pcm[substream->stream];
struct sst_byt *byt = pdata->byt;
dev_dbg(rtd->dev, "PCM: trigger %d\n", cmd);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
pcm_data->hw_ptr = 0;
sst_byt_stream_start(byt, pcm_data->stream, 0);
break;
case SNDRV_PCM_TRIGGER_RESUME:
if (pdata->restore_stream == true)
schedule_work(&pcm_data->work);
else
sst_byt_stream_resume(byt, pcm_data->stream);
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
sst_byt_stream_resume(byt, pcm_data->stream);
break;
case SNDRV_PCM_TRIGGER_STOP:
sst_byt_stream_stop(byt, pcm_data->stream);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
pdata->restore_stream = false;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
sst_byt_stream_pause(byt, pcm_data->stream);
break;
default:
break;
}
return 0;
}
static u32 byt_notify_pointer(struct sst_byt_stream *stream, void *data)
{
struct sst_byt_pcm_data *pcm_data = data;
struct snd_pcm_substream *substream = pcm_data->substream;
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct sst_byt_priv_data *pdata =
snd_soc_platform_get_drvdata(rtd->platform);
struct sst_byt *byt = pdata->byt;
u32 pos, hw_pos;
hw_pos = sst_byt_get_dsp_position(byt, pcm_data->stream,
snd_pcm_lib_buffer_bytes(substream));
pcm_data->hw_ptr = hw_pos;
pos = frames_to_bytes(runtime,
(runtime->control->appl_ptr
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