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// SPDX-License-Identifier: GPL-2.0
/*
* dw-hdmi-i2s-audio.c
*
* Copyright (c) 2017 Renesas Solutions Corp.
* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
*/
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <drm/bridge/dw_hdmi.h>
#include <drm/drm_crtc.h>
#include <sound/hdmi-codec.h>
#include "dw-hdmi.h"
#include "dw-hdmi-audio.h"
#define DRIVER_NAME "dw-hdmi-i2s-audio"
static inline void hdmi_write(struct dw_hdmi_i2s_audio_data *audio,
u8 val, int offset)
{
struct dw_hdmi *hdmi = audio->hdmi;
audio->write(hdmi, val, offset);
}
static inline u8 hdmi_read(struct dw_hdmi_i2s_audio_data *audio, int offset)
{
struct dw_hdmi *hdmi = audio->hdmi;
return audio->read(hdmi, offset);
}
static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
struct hdmi_codec_daifmt *fmt,
struct hdmi_codec_params *hparms)
{
struct dw_hdmi_i2s_audio_data *audio = data;
struct dw_hdmi *hdmi = audio->hdmi;
u8 conf0 = 0;
u8 conf1 = 0;
u8 inputclkfs = 0;
/* it cares I2S only */
if (fmt->bit_clk_provider | fmt->frame_clk_provider) {
dev_err(dev, "unsupported clock settings\n");
return -EINVAL;
}
/* Reset the FIFOs before applying new params */
hdmi_write(audio, HDMI_AUD_CONF0_SW_RESET, HDMI_AUD_CONF0);
hdmi_write(audio, (u8)~HDMI_MC_SWRSTZ_I2SSWRST_REQ, HDMI_MC_SWRSTZ);
inputclkfs = HDMI_AUD_INPUTCLKFS_64FS;
conf0 = (HDMI_AUD_CONF0_I2S_SELECT | HDMI_AUD_CONF0_I2S_EN0);
/* Enable the required i2s lanes */
switch (hparms->channels) {
case 7 ... 8:
conf0 |= HDMI_AUD_CONF0_I2S_EN3;
fallthrough;
case 5 ... 6:
conf0 |= HDMI_AUD_CONF0_I2S_EN2;
fallthrough;
case 3 ... 4:
conf0 |= HDMI_AUD_CONF0_I2S_EN1;
/* Fall-thru */
}
switch (hparms->sample_width) {
case 16:
conf1 = HDMI_AUD_CONF1_WIDTH_16;
break;
case 24:
case 32:
conf1 = HDMI_AUD_CONF1_WIDTH_24;
break;
}
switch (fmt->fmt) {
case HDMI_I2S:
conf1 |= HDMI_AUD_CONF1_MODE_I2S;
break;
case HDMI_RIGHT_J:
conf1 |= HDMI_AUD_CONF1_MODE_RIGHT_J;
break;
case HDMI_LEFT_J:
conf1 |= HDMI_AUD_CONF1_MODE_LEFT_J;
break;
case HDMI_DSP_A:
conf1 |= HDMI_AUD_CONF1_MODE_BURST_1;
break;
case HDMI_DSP_B:
conf1 |= HDMI_AUD_CONF1_MODE_BURST_2;
break;
default:
dev_err(dev, "unsupported format\n");
return -EINVAL;
}
dw_hdmi_set_sample_rate(hdmi, hparms->sample_rate);
dw_hdmi_set_channel_status(hdmi, hparms->iec.status);
dw_hdmi_set_channel_count(hdmi, hparms->channels);
dw_hdmi_set_channel_allocation(hdmi, hparms->cea.channel_allocation);
hdmi_write(audio, inputclkfs, HDMI_AUD_INPUTCLKFS);
hdmi_write(audio, conf0, HDMI_AUD_CONF0);
hdmi_write(audio, conf1, HDMI_AUD_CONF1);
return 0;
}
static int dw_hdmi_i2s_audio_startup(struct device *dev, void *data)
{
struct dw_hdmi_i2s_audio_data *audio = data;
struct dw_hdmi *hdmi = audio->hdmi;
dw_hdmi_audio_enable(hdmi);
return 0;
}
static void dw_hdmi_i2s_audio_shutdown(struct device *dev, void *data)
{
struct dw_hdmi_i2s_audio_data *audio = data;
struct dw_hdmi *hdmi = audio->hdmi;
dw_hdmi_audio_disable(hdmi);
}
static int dw_hdmi_i2s_get_eld(struct device *dev, void *data, uint8_t *buf,
size_t len)
{
struct dw_hdmi_i2s_audio_data *audio = data;
u8 *eld;
eld = audio->get_eld(audio->hdmi);
if (eld)
memcpy(buf, eld, min_t(size_t, MAX_ELD_BYTES, len));
else
/* Pass en empty ELD if connector not available */
memset(buf, 0, len);
return 0;
}
static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
struct device_node *endpoint)
{
struct of_endpoint of_ep;
int ret;
ret = of_graph_parse_endpoint(endpoint, &of_ep);
if (ret < 0)
return ret;
/*
* HDMI sound should be located as reg = <2>
* Then, it is sound port 0
*/
if (of_ep.port == 2)
return 0;
return -EINVAL;
}
static int dw_hdmi_i2s_hook_plugged_cb(struct device *dev, void *data,
hdmi_codec_plugged_cb fn,
struct device *codec_dev)
{
struct dw_hdmi_i2s_audio_data *audio = data;
struct dw_hdmi *hdmi = audio->hdmi;
return dw_hdmi_set_plugged_cb(hdmi, fn, codec_dev);
}
static const struct hdmi_codec_ops dw_hdmi_i2s_ops = {
.hw_params = dw_hdmi_i2s_hw_params,
.audio_startup = dw_hdmi_i2s_audio_startup,
.audio_shutdown = dw_hdmi_i2s_audio_shutdown,
.get_eld = dw_hdmi_i2s_get_eld,
.get_dai_id = dw_hdmi_i2s_get_dai_id,
.hook_plugged_cb = dw_hdmi_i2s_hook_plugged_cb,
};
static int snd_dw_hdmi_probe(struct platform_device *pdev)
{
struct dw_hdmi_i2s_audio_data *audio = pdev->dev.platform_data;
struct platform_device_info pdevinfo;
struct hdmi_codec_pdata pdata;
struct platform_device *platform;
memset(&pdata, 0, sizeof(pdata));
pdata.ops = &dw_hdmi_i2s_ops;
pdata.i2s = 1;
pdata.max_i2s_channels = 8;
pdata.data = audio;
memset(&pdevinfo, 0, sizeof(pdevinfo));
pdevinfo.parent = pdev->dev.parent;
pdevinfo.id = PLATFORM_DEVID_AUTO;
pdevinfo.name = HDMI_CODEC_DRV_NAME;
pdevinfo.data = &pdata;
pdevinfo.size_data = sizeof(pdata);
pdevinfo.dma_mask = DMA_BIT_MASK(32);
platform = platform_device_register_full(&pdevinfo);
if (IS_ERR(platform))
return PTR_ERR(platform);
dev_set_drvdata(&pdev->dev, platform);
return 0;
}
static void snd_dw_hdmi_remove(struct platform_device *pdev)
{
struct platform_device *platform = dev_get_drvdata(&pdev->dev);
platform_device_unregister(platform);
}
static struct platform_driver snd_dw_hdmi_driver = {
.probe = snd_dw_hdmi_probe,
.remove = snd_dw_hdmi_remove,
.driver = {
.name = DRIVER_NAME,
},
};
module_platform_driver(snd_dw_hdmi_driver);
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_DESCRIPTION("Synopsis Designware HDMI I2S ALSA SoC interface");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRIVER_NAME);
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