// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) STMicroelectronics SA 2015
* Authors: Arnaud Pouliquen <[email protected]>
* for STMicroelectronics.
*/
#include <linux/io.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/mfd/syscon.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
/* DAC definitions */
/* stih407 DAC registers */
/* sysconf 5041: Audio-Gue-Control */
#define STIH407_AUDIO_GLUE_CTRL 0x000000A4
/* sysconf 5042: Audio-DAC-Control */
#define STIH407_AUDIO_DAC_CTRL 0x000000A8
/* DAC definitions */
#define STIH407_DAC_SOFTMUTE 0x0
#define STIH407_DAC_STANDBY_ANA 0x1
#define STIH407_DAC_STANDBY 0x2
#define STIH407_DAC_SOFTMUTE_MASK BIT(STIH407_DAC_SOFTMUTE)
#define STIH407_DAC_STANDBY_ANA_MASK BIT(STIH407_DAC_STANDBY_ANA)
#define STIH407_DAC_STANDBY_MASK BIT(STIH407_DAC_STANDBY)
/* SPDIF definitions */
#define SPDIF_BIPHASE_ENABLE 0x6
#define SPDIF_BIPHASE_IDLE 0x7
#define SPDIF_BIPHASE_ENABLE_MASK BIT(SPDIF_BIPHASE_ENABLE)
#define SPDIF_BIPHASE_IDLE_MASK BIT(SPDIF_BIPHASE_IDLE)
enum {
STI_SAS_DAI_SPDIF_OUT,
STI_SAS_DAI_ANALOG_OUT,
};
static const struct reg_default stih407_sas_reg_defaults[] = {
{ STIH407_AUDIO_DAC_CTRL, 0x000000000 },
{ STIH407_AUDIO_GLUE_CTRL, 0x00000040 },
};
struct sti_dac_audio {
struct regmap *regmap;
struct regmap *virt_regmap;
int mclk;
};
struct sti_spdif_audio {
struct regmap *regmap;
int mclk;
};
/* device data structure */
struct sti_sas_dev_data {
const struct regmap_config *regmap;
const struct snd_soc_dai_ops *dac_ops; /* DAC function callbacks */
};
/* driver data structure */
struct sti_sas_data {
struct device *dev;
const struct sti_sas_dev_data *dev_data;
struct sti_dac_audio dac;
struct sti_spdif_audio spdif;
};
/* Read a register from the sysconf reg bank */
static int sti_sas_read_reg(void *context, unsigned int reg,
unsigned int *value)
{
struct sti_sas_data *drvdata = context;
int status;
u32 val;
status = regmap_read(drvdata->dac.regmap, reg, &val);
*value = (unsigned int)val;
return status;
}
/* Read a register from the sysconf reg bank */
static int sti_sas_write_reg(void *context, unsigned int reg,
unsigned int value)
{
struct sti_sas_data *drvdata = context;
return regmap_write(drvdata->dac.regmap, reg, value);
}
static int sti_sas_init_sas_registers(struct snd_soc_component *component,
struct sti_sas_data *data)
{
int ret;
/*
* DAC and SPDIF are activated by default
* put them in IDLE to save power
*/
/* Initialise bi-phase formatter to disabled */
ret = snd_soc_component_update_bits(component, STIH407_AUDIO_GLUE_CTRL,
SPDIF_BIPHASE_ENABLE_MASK, 0);
if (!ret)
/* Initialise bi-phase formatter idle value to 0 */
ret = snd_soc_component_update_bits(component, STIH407_AUDIO_GLUE_CTRL,
SPDIF_BIPHASE_IDLE_MASK, 0);
if (ret < 0) {
dev_err(component->dev, "Failed to update SPDIF registers\n");
return ret;
}
/* Init DAC configuration */
/* init configuration */
ret = snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
STIH407_DAC_STANDBY_MASK,
STIH407_DAC_STANDBY_MASK);
if (!ret)
ret = snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
STIH407_DAC_STANDBY_ANA_MASK,
STIH407_DAC_STANDBY_ANA_MASK);
if (!ret)
ret = snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
STIH407_DAC_SOFTMUTE_MASK,
STIH407_DAC_SOFTMUTE_MASK);
if (ret < 0) {
dev_err(component->dev, "Failed to update DAC registers\n");
return ret;
}
return ret;
}
/*
* DAC
*/
static int sti_sas_dac_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
/* Sanity check only */
if ((fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) != SND_SOC_DAIFMT_CBC_CFC) {
dev_err(dai->component->dev,
"%s: ERROR: Unsupported clocking 0x%x\n",
__func__, fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK);
return -EINVAL;
}
return 0;
}
static const struct snd_soc_dapm_widget stih407_sas_dapm_widgets[] = {
SND_SOC_DAPM_OUT_DRV("DAC standby ana", STIH407_AUDIO_DAC_CTRL,
STIH407_DAC_STANDBY_ANA, 1, NULL, 0),
SND_SOC_DAPM_DAC("DAC standby", "dac_p", STIH407_AUDIO_DAC_CTRL,
STIH407_DAC_STANDBY, 1),
SND_SOC_DAPM_OUTPUT("DAC Output"),
};
static const struct snd_soc_dapm_route stih407_sas_route[] = {
{"DAC Output", NULL, "DAC standby ana"},
{"DAC standby ana", NULL, "DAC standby"},
};
static int stih407_sas_dac_mute(struct snd_soc_dai *dai, int mute, int stream)
{
struct snd_soc_component *component = dai->component;
if (mute) {
return snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
STIH407_DAC_SOFTMUTE_MASK,
STIH407_DAC_SOFTMUTE_MASK);
} else {
return snd_soc_component_update_bits(component, STIH407_AUDIO_DAC_CTRL,
STIH407_DAC_SOFTMUTE_MASK,
0);
}
}
/*
* SPDIF
*/
static int sti_sas_spdif_set_fmt(struct snd_soc_dai *dai,
unsigned int fmt)
{
if ((fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) != SND_SOC_DAIFMT_CBC_CFC) {
dev_err(dai->component->dev,
"%s: ERROR: Unsupported clocking mask 0x%x\n",
__func__, fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK);
return -EINVAL;
}
return 0;
}
/*
* sti_sas_spdif_trigger:
* Trigger function is used to ensure that BiPhase Formater is disabled
* before CPU dai is stopped.
* This is mandatory to avoid that BPF is stalled
*/
static int sti_sas_spdif_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
return snd_soc_component_update_bits(component, STIH407_AUDIO_GLUE_CTRL,
SPDIF_BIPHASE_ENABLE_MASK,
SPDIF_BIPHASE_ENABLE_MASK);
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
return snd_soc_component_update_bits(component, STIH407_AUDIO_GLUE_CTRL,
SPDIF_BIPHASE_ENABLE_MASK,
0);
default:
return -EINVAL;
}
}
static bool sti_sas_volatile_register(struct device *dev, unsigned int reg)
{
if (reg == STIH407_AUDIO_GLUE_CTRL)
return true;
return false;
}
/*
* CODEC DAIS
*/
/*
* sti_sas_set_sysclk:
* get MCLK input frequency to check that MCLK-FS ratio is coherent
*/
static int sti_sas_set_sysclk(struct snd_soc_dai *dai, int clk_id,
unsigned int freq, int dir)
{
struct snd_soc_component *component = dai->component;
struct sti_sas_data *drvdata = dev_get_drvdata(component->dev);
if (dir == SND_SOC_CLOCK_OUT)
return 0;
if (clk_id != 0)
return -EINVAL;
switch (dai->id) {
case STI_SAS_DAI_SPDIF_OUT:
drvdata->spdif.mclk = freq;
break;
case STI_SAS_DAI_ANALOG_OUT:
drvdata->dac.mclk = freq;
break;
}
return 0;
}
static int sti_sas_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
struct sti_sas_data *drvdata = dev_get_drvdata(component->dev);
struct snd_pcm_runtime *runtime = substream->runtime;
switch (dai->id) {
case STI_SAS_DAI_SPDIF_OUT:
if ((drvdata->spdif.mclk / runtime->rate) != 128) {
dev_err(component->dev, "unexpected mclk-fs ratio\n");
return -EINVAL;
}
break;
case STI_SAS_DAI_ANALOG_OUT:
if ((drvdata->dac.mclk / runtime->rate) != 256) {
dev_err(component->dev, "unexpected mclk-fs ratio\n");
return -EINVAL;
}
break;
}
return 0;
}
static const struct snd_soc_dai_ops stih407_dac_ops = {
.set_fmt = sti_sas_dac_set_fmt,
.mute_stream = stih407_sas_dac_mute,
.prepare = sti_sas_prepare,
.set_sysclk = sti_sas_set_sysclk,
};
static const struct regmap_config stih407_sas_regmap = {
.reg_bits = 32,
.val_bits = 32,
.fast_io = true,
.max_register = STIH407_AUDIO_DAC_CTRL,
.reg_defaults = stih407_sas_reg_defaults,
.num_reg_defaults = ARRAY_SIZE(stih407_sas_reg_defaults),
.volatile_reg = sti_sas_volatile_register,
.cache_type = REGCACHE_MAPLE,
.reg_read = sti_sas_read_reg,
.reg_write = sti_sas_write_reg,
};
static const struct sti_sas_dev_data stih407_data = {
.regmap = &stih407_sas_regmap,
.dac_ops = &stih407_dac_ops,
};
static struct snd_soc_dai_driver sti_sas_dai[] = {
{
.name = "sas-dai-spdif-out",
.id = STI_SAS_DAI_SPDIF_OUT,
.playback = {
.stream_name = "spdif_p",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 |
SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 |
SNDRV_PCM_RATE_192000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S32_LE,
},
.ops = (struct snd_soc_dai_ops[]) {
{
.set_fmt = sti_sas_spdif_set_fmt,
.trigger = sti_sas_spdif_trigger,
.set_sysclk = sti_sas_set_sysclk,
.prepare = sti_sas_prepare,
}
},
},
{
.name = "sas-dai-dac",
.id = STI_SAS_DAI_ANALOG_OUT,
.playback = {
.stream_name = "dac_p",
.channels_min = 2,
.channels_max = 2,
.rates = SNDRV_PCM_RATE_8000_48000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S32_LE,
},
},
};
#ifdef CONFIG_PM_SLEEP
static int sti_sas_resume(struct snd_soc_component *component)
{
struct sti_sas_data *drvdata = dev_get_drvdata(component->dev);
return sti_sas_init_sas_registers(component, drvdata);
}
#else
#define sti_sas_resume NULL
#endif
static int sti_sas_component_probe(struct snd_soc_component *component)
{
struct sti_sas_data *drvdata = dev_get_drvdata(component->dev);
return sti_sas_init_sas_registers(component, drvdata);
}
static const struct snd_soc_component_driver sti_sas_driver = {
.probe = sti_sas_component_probe,
.resume = sti_sas_resume,
.idle_bias_on = 1,
.use_pmdown_time = 1,
.endianness = 1,
.dapm_widgets = stih407_sas_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(stih407_sas_dapm_widgets),
.dapm_routes = stih407_sas_route,
.num_dapm_routes = ARRAY_SIZE(stih407_sas_route),
};
static const struct of_device_id sti_sas_dev_match[] = {
{
.compatible = "st,stih407-sas-codec",
.data = &stih407_data,
},
{},
};
MODULE_DEVICE_TABLE(of, sti_sas_dev_match);
static int sti_sas_driver_probe(struct platform_device *pdev)
{
struct device_node *pnode = pdev->dev.of_node;
struct sti_sas_data *drvdata;
const struct of_device_id *of_id;
/* Allocate device structure */
drvdata = devm_kzalloc(&pdev->dev, sizeof(struct sti_sas_data),
GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
/* Populate data structure depending on compatibility */
of_id = of_match_node(sti_sas_dev_match, pnode);
if (!of_id->data) {
dev_err(&pdev->dev, "data associated to device is missing\n");
return -EINVAL;
}
drvdata->dev_data = (struct sti_sas_dev_data *)of_id->data;
/* Initialise device structure */
drvdata->dev = &pdev->dev;
/* Request the DAC & SPDIF registers memory region */
drvdata->dac.virt_regmap = devm_regmap_init(&pdev->dev, NULL, drvdata,
drvdata->dev_data->regmap);
if (IS_ERR(drvdata->dac.virt_regmap)) {
dev_err(&pdev->dev, "audio registers not enabled\n");
return PTR_ERR(drvdata->dac.virt_regmap);
}
/* Request the syscon region */
drvdata->dac.regmap =
syscon_regmap_lookup_by_phandle(pnode, "st,syscfg");
if (IS_ERR(drvdata->dac.regmap)) {
dev_err(&pdev->dev, "syscon registers not available\n");
return PTR_ERR(drvdata->dac.regmap);
}
drvdata->spdif.regmap = drvdata->dac.regmap;
sti_sas_dai[STI_SAS_DAI_ANALOG_OUT].ops = drvdata->dev_data->dac_ops;
/* Store context */
dev_set_drvdata(&pdev->dev, drvdata);
return devm_snd_soc_register_component(&pdev->dev, &sti_sas_driver,
sti_sas_dai,
ARRAY_SIZE(sti_sas_dai));
}
static struct platform_driver sti_sas_platform_driver = {
.driver = {
.name = "sti-sas-codec",
.of_match_table = sti_sas_dev_match,
},
.probe = sti_sas_driver_probe,
};
module_platform_driver(sti_sas_platform_driver);
MODULE_DESCRIPTION("audio codec for STMicroelectronics sti platforms");
MODULE_AUTHOR("[email protected]");
MODULE_LICENSE("GPL v2");
Codebase Browser
linux