// SPDX-License-Identifier: GPL-2.0-only
/*
* omap-hdmi-audio.c -- OMAP4+ DSS HDMI audio support library
*
* Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com
*
* Author: Jyri Sarha <[email protected]>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/platform_device.h>
#include <sound/soc.h>
#include <sound/pcm_params.h>
#include <sound/dmaengine_pcm.h>
#include <uapi/sound/asound.h>
#include <sound/asoundef.h>
#include <sound/omap-hdmi-audio.h>
#include "sdma-pcm.h"
#define DRV_NAME "omap-hdmi-audio"
struct hdmi_audio_data {
struct snd_soc_card *card;
const struct omap_hdmi_audio_ops *ops;
struct device *dssdev;
struct snd_dmaengine_dai_dma_data dma_data;
struct omap_dss_audio dss_audio;
struct snd_aes_iec958 iec;
struct snd_cea_861_aud_if cea;
struct mutex current_stream_lock;
struct snd_pcm_substream *current_stream;
};
static
struct hdmi_audio_data *card_drvdata_substream(struct snd_pcm_substream *ss)
{
struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(ss);
return snd_soc_card_get_drvdata(rtd->card);
}
static void hdmi_dai_abort(struct device *dev)
{
struct hdmi_audio_data *ad = dev_get_drvdata(dev);
mutex_lock(&ad->current_stream_lock);
if (ad->current_stream && ad->current_stream->runtime &&
snd_pcm_running(ad->current_stream)) {
dev_err(dev, "HDMI display disabled, aborting playback\n");
snd_pcm_stream_lock_irq(ad->current_stream);
snd_pcm_stop(ad->current_stream, SNDRV_PCM_STATE_DISCONNECTED);
snd_pcm_stream_unlock_irq(ad->current_stream);
}
mutex_unlock(&ad->current_stream_lock);
}
static int hdmi_dai_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct hdmi_audio_data *ad = card_drvdata_substream(substream);
int ret;
/*
* Make sure that the period bytes are multiple of the DMA packet size.
* Largest packet size we use is 32 32-bit words = 128 bytes
*/
ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 128);
if (ret < 0) {
dev_err(dai->dev, "Could not apply period constraint: %d\n",
ret);
return ret;
}
ret = snd_pcm_hw_constraint_step(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 128);
if (ret < 0) {
dev_err(dai->dev, "Could not apply buffer constraint: %d\n",
ret);
return ret;
}
snd_soc_dai_set_dma_data(dai, substream, &ad->dma_data);
mutex_lock(&ad->current_stream_lock);
ad->current_stream = substream;
mutex_unlock(&ad->current_stream_lock);
ret = ad->ops->audio_startup(ad->dssdev, hdmi_dai_abort);
if (ret) {
mutex_lock(&ad->current_stream_lock);
ad->current_stream = NULL;
mutex_unlock(&ad->current_stream_lock);
}
return ret;
}
static int hdmi_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct hdmi_audio_data *ad = card_drvdata_substream(substream);
struct snd_aes_iec958 *iec = &ad->iec;
struct snd_cea_861_aud_if *cea = &ad->cea;
WARN_ON(ad->current_stream != substream);
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
ad->dma_data.maxburst = 16;
break;
case SNDRV_PCM_FORMAT_S24_LE:
ad->dma_data.maxburst = 32;
break;
default:
dev_err(dai->dev, "format not supported!\n");
return -EINVAL;
}
ad->dss_audio.iec = iec;
ad->dss_audio.cea = cea;
/*
* fill the IEC-60958 channel status word
*/
/* initialize the word bytes */
memset(iec->status, 0, sizeof(iec->status));
/* specify IEC-60958-3 (commercial use) */
iec->status[0] &= ~IEC958_AES0_PROFESSIONAL;
/* specify that the audio is LPCM*/
iec->status[0] &= ~IEC958_AES0_NONAUDIO;
iec->status[0] |= IEC958_AES0_CON_NOT_COPYRIGHT;
iec->status[0] |= IEC958_AES0_CON_EMPHASIS_NONE;
iec->status[1] = IEC958_AES1_CON_GENERAL;
iec->status[2] |= IEC958_AES2_CON_SOURCE_UNSPEC;
iec->status[2] |= IEC958_AES2_CON_CHANNEL_UNSPEC;
switch (params_rate(params)) {
case 32000:
iec->status[3] |= IEC958_AES3_CON_FS_32000;
break;
case 44100:
iec->status[3] |= IEC958_AES3_CON_FS_44100;
break;
case 48000:
iec->status[3] |= IEC958_AES3_CON_FS_48000;
break;
case 88200:
iec->status[3] |= IEC958_AES3_CON_FS_88200;
break;
case 96000:
iec->status[3] |= IEC958_AES3_CON_FS_96000;
break;
case 176400:
iec->status[3] |= IEC958_AES3_CON_FS_176400;
break;
case 192000:
iec->status[3] |= IEC958_AES3_CON_FS_192000;
break;
default:
dev_err(dai->dev, "rate not supported!\n");
return -EINVAL;
}
/* specify the clock accuracy */
iec->status[3] |= IEC958_AES3_CON_CLOCK_1000PPM;
/*
* specify the word length. The same word length value can mean
* two different lengths. Hence, we need to specify the maximum
* word length as well.
*/
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
iec->status[4] |= IEC958_AES4_CON_WORDLEN_20_16;
iec->status[4] &= ~IEC958_AES4_CON_MAX_WORDLEN_24;
break;
case SNDRV_PCM_FORMAT_S24_LE:
iec->status[4] |= IEC958_AES4_CON_WORDLEN_24_20;
iec->status[4] |= IEC958_AES4_CON_MAX_WORDLEN_24;
break;
default:
dev_err(dai->dev, "format not supported!\n");
return -EINVAL;
}
/*
* Fill the CEA-861 audio infoframe (see spec for details)
*/
cea->db1_ct_cc = (params_channels(params) - 1)
& CEA861_AUDIO_INFOFRAME_DB1CC;
cea->db1_ct_cc |= CEA861_AUDIO_INFOFRAME_DB1CT_FROM_STREAM;
cea->db2_sf_ss = CEA861_AUDIO_INFOFRAME_DB2SF_FROM_STREAM;
cea->db2_sf_ss |= CEA861_AUDIO_INFOFRAME_DB2SS_FROM_STREAM;
cea->db3 = 0; /* not used, all zeros */
if (params_channels(params) == 2)
cea->db4_ca = 0x0;
else if (params_channels(params) == 6)
cea->db4_ca = 0xb;
else
cea->db4_ca = 0x13;
if (cea->db4_ca == 0x00)
cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PERMITTED;
else
cea->db5_dminh_lsv = CEA861_AUDIO_INFOFRAME_DB5_DM_INH_PROHIBITED;
/* the expression is trivial but makes clear what we are doing */
cea->db5_dminh_lsv |= (0 & CEA861_AUDIO_INFOFRAME_DB5_LSV);
return ad->ops->audio_config(ad->dssdev, &ad->dss_audio);
}
static int hdmi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct hdmi_audio_data *ad = card_drvdata_substream(substream);
int err = 0;
WARN_ON(ad->current_stream != substream);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
err = ad->ops->audio_start(ad->dssdev);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
ad->ops->audio_stop(ad->dssdev);
break;
default:
err = -EINVAL;
}
return err;
}
static void hdmi_dai_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct hdmi_audio_data *ad = card_drvdata_substream(substream);
WARN_ON(ad->current_stream != substream);
ad->ops->audio_shutdown(ad->dssdev);
mutex_lock(&ad->current_stream_lock);
ad->current_stream = NULL;
mutex_unlock(&ad->current_stream_lock);
}
static const struct snd_soc_dai_ops hdmi_dai_ops = {
.startup = hdmi_dai_startup,
.hw_params = hdmi_dai_hw_params,
.trigger = hdmi_dai_trigger,
.shutdown = hdmi_dai_shutdown,
};
static const struct snd_soc_component_driver omap_hdmi_component = {
.name = "omapdss_hdmi",
.legacy_dai_naming = 1,
};
static struct snd_soc_dai_driver omap5_hdmi_dai = {
.name = "omap5-hdmi-dai",
.playback = {
.channels_min = 2,
.channels_max = 8,
.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
SNDRV_PCM_RATE_192000),
.formats = SNDRV_PCM_FMTBIT_S16_LE,
},
.ops = &hdmi_dai_ops,
};
static struct snd_soc_dai_driver omap4_hdmi_dai = {
.name = "omap4-hdmi-dai",
.playback = {
.channels_min = 2,
.channels_max = 8,
.rates = (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |
SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |
SNDRV_PCM_RATE_192000),
.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
},
.ops = &hdmi_dai_ops,
};
static int omap_hdmi_audio_probe(struct platform_device *pdev)
{
struct omap_hdmi_audio_pdata *ha = pdev->dev.platform_data;
struct device *dev = &pdev->dev;
struct hdmi_audio_data *ad;
struct snd_soc_dai_driver *dai_drv;
struct snd_soc_card *card;
struct snd_soc_dai_link_component *compnent;
int ret;
if (!ha) {
dev_err(dev, "No platform data\n");
return -EINVAL;
}
ad = devm_kzalloc(dev, sizeof(*ad), GFP_KERNEL);
if (!ad)
return -ENOMEM;
ad->dssdev = ha->dev;
ad->ops = ha->ops;
ad->dma_data.addr = ha->audio_dma_addr;
ad->dma_data.filter_data = "audio_tx";
ad->dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
mutex_init(&ad->current_stream_lock);
switch (ha->version) {
case 4:
dai_drv = &omap4_hdmi_dai;
break;
case 5:
dai_drv = &omap5_hdmi_dai;
break;
default:
return -EINVAL;
}
ret = devm_snd_soc_register_component(ad->dssdev, &omap_hdmi_component,
dai_drv, 1);
if (ret)
return ret;
ret = sdma_pcm_platform_register(ad->dssdev, "audio_tx", NULL);
if (ret)
return ret;
card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
if (!card)
return -ENOMEM;
card->name = "HDMI";
card->owner = THIS_MODULE;
card->dai_link =
devm_kzalloc(dev, sizeof(*(card->dai_link)), GFP_KERNEL);
if (!card->dai_link)
return -ENOMEM;
compnent = devm_kzalloc(dev, sizeof(*compnent), GFP_KERNEL);
if (!compnent)
return -ENOMEM;
card->dai_link->cpus = compnent;
card->dai_link->num_cpus = 1;
card->dai_link->codecs = &snd_soc_dummy_dlc;
card->dai_link->num_codecs = 1;
card->dai_link->name = card->name;
card->dai_link->stream_name = card->name;
card->dai_link->cpus->dai_name = dev_name(ad->dssdev);
card->num_links = 1;
card->dev = dev;
ret = devm_snd_soc_register_card(dev, card);
if (ret) {
dev_err(dev, "snd_soc_register_card failed (%d)\n", ret);
return ret;
}
ad->card = card;
snd_soc_card_set_drvdata(card, ad);
dev_set_drvdata(dev, ad);
return 0;
}
static struct platform_driver hdmi_audio_driver = {
.driver = {
.name = DRV_NAME,
},
.probe = omap_hdmi_audio_probe,
};
module_platform_driver(hdmi_audio_driver);
MODULE_AUTHOR("Jyri Sarha <[email protected]>");
MODULE_DESCRIPTION("OMAP HDMI Audio Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
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