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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 "sst-dsp-priv.h"
#include "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 %
runtime->buffer_size));
dev_dbg(rtd->dev, "PCM: App/DMA pointer %u/%u bytes\n", pos, hw_pos);
snd_pcm_period_elapsed(substream);
return pos;
}
static snd_pcm_uframes_t sst_byt_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_pcm_runtime *runtime = substream->runtime;
struct sst_byt_priv_data *pdata =
snd_soc_platform_get_drvdata(rtd->platform);
struct sst_byt_pcm_data *pcm_data = &pdata->pcm[substream->stream];
dev_dbg(rtd->dev, "PCM: DMA pointer %u bytes\n", pcm_data->hw_ptr);
return bytes_to_frames(runtime, pcm_data->hw_ptr);
}
static int sst_byt_pcm_open(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;
dev_dbg(rtd->dev, "PCM: open\n");
mutex_lock(&pcm_data->mutex);
pcm_data->substream = substream;
snd_soc_set_runtime_hwparams(substream, &sst_byt_pcm_hardware);
pcm_data->stream = sst_byt_stream_new(byt, substream->stream + 1,
byt_notify_pointer, pcm_data);
if (pcm_data->stream == NULL) {
dev_err(rtd->dev, "failed to create stream\n");
mutex_unlock(&pcm_data->mutex);
return -EINVAL;
}
mutex_unlock(&pcm_data->mutex);
return 0;
}
static int sst_byt_pcm_close(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;
dev_dbg(rtd->dev, "PCM: close\n");
cancel_work_sync(&pcm_data->work);
mutex_lock(&pcm_data->mutex);
ret = sst_byt_stream_free(byt, pcm_data->stream);
if (ret < 0) {
dev_dbg(rtd->dev, "Free stream fail\n");
goto out;
}
pcm_data->stream = NULL;
out:
mutex_unlock(&pcm_data->mutex);
return ret;
}
static int sst_byt_pcm_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *vma)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
dev_dbg(rtd->dev, "PCM: mmap\n");
return snd_pcm_lib_default_mmap(substream, vma);
}
static struct snd_pcm_ops sst_byt_pcm_ops = {
.open = sst_byt_pcm_open,
.close = sst_byt_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = sst_byt_pcm_hw_params,
.hw_free = sst_byt_pcm_hw_free,
.trigger = sst_byt_pcm_trigger,
.pointer = sst_byt_pcm_pointer,
.mmap = sst_byt_pcm_mmap,
};
static void sst_byt_pcm_free(struct snd_pcm *pcm)
{
snd_pcm_lib_preallocate_free_for_all(pcm);
}
static int sst_byt_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
struct snd_pcm *pcm = rtd->pcm;
size_t size;
struct snd_soc_platform *platform = rtd->platform;
struct sst_pdata *pdata = dev_get_platdata(platform->dev);
int ret = 0;
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream ||
pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) {
size = sst_byt_pcm_hardware.buffer_bytes_max;
ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
SNDRV_DMA_TYPE_DEV,
pdata->dma_dev,
size, size);
if (ret) {
dev_err(rtd->dev, "dma buffer allocation failed %d\n",
ret);
return ret;
}
}
return ret;
}
static struct snd_soc_dai_driver byt_dais[] = {
{
.name = "Baytrail PCM",
.playback = {
.stream_name = "System Playback",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S24_3LE |
SNDRV_PCM_FMTBIT_S16_LE,
},
.capture = {
.stream_name = "Analog Capture",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
},
};
static int sst_byt_pcm_probe(struct snd_soc_platform *platform)
{
struct sst_pdata *plat_data = dev_get_platdata(platform->dev);
struct sst_byt_priv_data *priv_data;
int i;
if (!plat_data)
return -ENODEV;
priv_data = devm_kzalloc(platform->dev, sizeof(*priv_data),
GFP_KERNEL);
priv_data->byt = plat_data->dsp;
snd_soc_platform_set_drvdata(platform, priv_data);
for (i = 0; i < BYT_PCM_COUNT; i++) {
mutex_init(&priv_data->pcm[i].mutex);
INIT_WORK(&priv_data->pcm[i].work, sst_byt_pcm_work);
}
return 0;
}
static int sst_byt_pcm_remove(struct snd_soc_platform *platform)
{
return 0;
}
static struct snd_soc_platform_driver byt_soc_platform = {
.probe = sst_byt_pcm_probe,
.remove = sst_byt_pcm_remove,
.ops = &sst_byt_pcm_ops,
.pcm_new = sst_byt_pcm_new,
.pcm_free = sst_byt_pcm_free,
};
static const struct snd_soc_component_driver byt_dai_component = {
.name = "byt-dai",
};
#ifdef CONFIG_PM
static int sst_byt_pcm_dev_suspend_late(struct device *dev)
{
struct sst_pdata *sst_pdata = dev_get_platdata(dev);
struct sst_byt_priv_data *priv_data = dev_get_drvdata(dev);
int ret;
dev_dbg(dev, "suspending late\n");
ret = sst_byt_dsp_suspend_late(dev, sst_pdata);
if (ret < 0) {
dev_err(dev, "failed to suspend %d\n", ret);
return ret;
}
priv_data->restore_stream = true;
return ret;
}
static int sst_byt_pcm_dev_resume_early(struct device *dev)
{
struct sst_pdata *sst_pdata = dev_get_platdata(dev);
int ret;
dev_dbg(dev, "resume early\n");
/* load fw and boot DSP */
ret = sst_byt_dsp_boot(dev, sst_pdata);
if (ret)
return ret;
/* wait for FW to finish booting */
return sst_byt_dsp_wait_for_ready(dev, sst_pdata);
}
static const struct dev_pm_ops sst_byt_pm_ops = {
.suspend_late = sst_byt_pcm_dev_suspend_late,
.resume_early = sst_byt_pcm_dev_resume_early,
};
#define SST_BYT_PM_OPS (&sst_byt_pm_ops)
#else
#define SST_BYT_PM_OPS NULL
#endif
static int sst_byt_pcm_dev_probe(struct platform_device *pdev)
{
struct sst_pdata *sst_pdata = dev_get_platdata(&pdev->dev);
int ret;
ret = sst_byt_dsp_init(&pdev->dev, sst_pdata);
if (ret < 0)
return -ENODEV;
ret = snd_soc_register_platform(&pdev->dev, &byt_soc_platform);
if (ret < 0)
goto err_plat;
ret = snd_soc_register_component(&pdev->dev, &byt_dai_component,
byt_dais, ARRAY_SIZE(byt_dais));
if (ret < 0)
goto err_comp;
return 0;
err_comp:
snd_soc_unregister_platform(&pdev->dev);
err_plat:
sst_byt_dsp_free(&pdev->dev, sst_pdata);
return ret;
}
static int sst_byt_pcm_dev_remove(struct platform_device *pdev)
{
struct sst_pdata *sst_pdata = dev_get_platdata(&pdev->dev);
snd_soc_unregister_platform(&pdev->dev);
snd_soc_unregister_component(&pdev->dev);
sst_byt_dsp_free(&pdev->dev, sst_pdata);
return 0;
}
static struct platform_driver sst_byt_pcm_driver = {
.driver = {
.name = "baytrail-pcm-audio",
.owner = THIS_MODULE,
.pm = SST_BYT_PM_OPS,
},
.probe = sst_byt_pcm_dev_probe,
.remove = sst_byt_pcm_dev_remove,
};
module_platform_driver(sst_byt_pcm_driver);
MODULE_AUTHOR("Jarkko Nikula");
MODULE_DESCRIPTION("Baytrail PCM");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:baytrail-pcm-audio");
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