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linuxdebug/sound/soc/meson/axg-spdifout.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: (GPL-2.0 OR MIT)
//
// Copyright (c) 2018 BayLibre, SAS.
// Author: Jerome Brunet <jbrunet@baylibre.com>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include <sound/pcm_params.h>
#include <sound/pcm_iec958.h>
/*
* NOTE:
* The meaning of bits SPDIFOUT_CTRL0_XXX_SEL is actually the opposite
* of what the documentation says. Manual control on V, U and C bits is
* applied when the related sel bits are cleared
*/
#define SPDIFOUT_STAT 0x00
#define SPDIFOUT_GAIN0 0x04
#define SPDIFOUT_GAIN1 0x08
#define SPDIFOUT_CTRL0 0x0c
#define SPDIFOUT_CTRL0_EN BIT(31)
#define SPDIFOUT_CTRL0_RST_OUT BIT(29)
#define SPDIFOUT_CTRL0_RST_IN BIT(28)
#define SPDIFOUT_CTRL0_USEL BIT(26)
#define SPDIFOUT_CTRL0_USET BIT(25)
#define SPDIFOUT_CTRL0_CHSTS_SEL BIT(24)
#define SPDIFOUT_CTRL0_DATA_SEL BIT(20)
#define SPDIFOUT_CTRL0_MSB_FIRST BIT(19)
#define SPDIFOUT_CTRL0_VSEL BIT(18)
#define SPDIFOUT_CTRL0_VSET BIT(17)
#define SPDIFOUT_CTRL0_MASK_MASK GENMASK(11, 4)
#define SPDIFOUT_CTRL0_MASK(x) ((x) << 4)
#define SPDIFOUT_CTRL1 0x10
#define SPDIFOUT_CTRL1_MSB_POS_MASK GENMASK(12, 8)
#define SPDIFOUT_CTRL1_MSB_POS(x) ((x) << 8)
#define SPDIFOUT_CTRL1_TYPE_MASK GENMASK(6, 4)
#define SPDIFOUT_CTRL1_TYPE(x) ((x) << 4)
#define SPDIFOUT_PREAMB 0x14
#define SPDIFOUT_SWAP 0x18
#define SPDIFOUT_CHSTS0 0x1c
#define SPDIFOUT_CHSTS1 0x20
#define SPDIFOUT_CHSTS2 0x24
#define SPDIFOUT_CHSTS3 0x28
#define SPDIFOUT_CHSTS4 0x2c
#define SPDIFOUT_CHSTS5 0x30
#define SPDIFOUT_CHSTS6 0x34
#define SPDIFOUT_CHSTS7 0x38
#define SPDIFOUT_CHSTS8 0x3c
#define SPDIFOUT_CHSTS9 0x40
#define SPDIFOUT_CHSTSA 0x44
#define SPDIFOUT_CHSTSB 0x48
#define SPDIFOUT_MUTE_VAL 0x4c
struct axg_spdifout {
struct regmap *map;
struct clk *mclk;
struct clk *pclk;
};
static void axg_spdifout_enable(struct regmap *map)
{
/* Apply both reset */
regmap_update_bits(map, SPDIFOUT_CTRL0,
SPDIFOUT_CTRL0_RST_OUT | SPDIFOUT_CTRL0_RST_IN,
0);
/* Clear out reset before in reset */
regmap_update_bits(map, SPDIFOUT_CTRL0,
SPDIFOUT_CTRL0_RST_OUT, SPDIFOUT_CTRL0_RST_OUT);
regmap_update_bits(map, SPDIFOUT_CTRL0,
SPDIFOUT_CTRL0_RST_IN, SPDIFOUT_CTRL0_RST_IN);
/* Enable spdifout */
regmap_update_bits(map, SPDIFOUT_CTRL0, SPDIFOUT_CTRL0_EN,
SPDIFOUT_CTRL0_EN);
}
static void axg_spdifout_disable(struct regmap *map)
{
regmap_update_bits(map, SPDIFOUT_CTRL0, SPDIFOUT_CTRL0_EN, 0);
}
static int axg_spdifout_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
axg_spdifout_enable(priv->map);
return 0;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
axg_spdifout_disable(priv->map);
return 0;
default:
return -EINVAL;
}
}
static int axg_spdifout_mute(struct snd_soc_dai *dai, int mute, int direction)
{
struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
/* Use spdif valid bit to perform digital mute */
regmap_update_bits(priv->map, SPDIFOUT_CTRL0, SPDIFOUT_CTRL0_VSET,
mute ? SPDIFOUT_CTRL0_VSET : 0);
return 0;
}
static int axg_spdifout_sample_fmt(struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
unsigned int val;
/* Set the samples spdifout will pull from the FIFO */
switch (params_channels(params)) {
case 1:
val = SPDIFOUT_CTRL0_MASK(0x1);
break;
case 2:
val = SPDIFOUT_CTRL0_MASK(0x3);
break;
default:
dev_err(dai->dev, "too many channels for spdif dai: %u\n",
params_channels(params));
return -EINVAL;
}
regmap_update_bits(priv->map, SPDIFOUT_CTRL0,
SPDIFOUT_CTRL0_MASK_MASK, val);
/* FIFO data are arranged in chunks of 64bits */
switch (params_physical_width(params)) {
case 8:
/* 8 samples of 8 bits */
val = SPDIFOUT_CTRL1_TYPE(0);
break;
case 16:
/* 4 samples of 16 bits - right justified */
val = SPDIFOUT_CTRL1_TYPE(2);
break;
case 32:
/* 2 samples of 32 bits - right justified */
val = SPDIFOUT_CTRL1_TYPE(4);
break;
default:
dev_err(dai->dev, "Unsupported physical width: %u\n",
params_physical_width(params));
return -EINVAL;
}
/* Position of the MSB in FIFO samples */
val |= SPDIFOUT_CTRL1_MSB_POS(params_width(params) - 1);
regmap_update_bits(priv->map, SPDIFOUT_CTRL1,
SPDIFOUT_CTRL1_MSB_POS_MASK |
SPDIFOUT_CTRL1_TYPE_MASK, val);
regmap_update_bits(priv->map, SPDIFOUT_CTRL0,
SPDIFOUT_CTRL0_MSB_FIRST | SPDIFOUT_CTRL0_DATA_SEL,
0);
return 0;
}
static int axg_spdifout_set_chsts(struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
unsigned int offset;
int ret;
u8 cs[4];
u32 val;
ret = snd_pcm_create_iec958_consumer_hw_params(params, cs, 4);
if (ret < 0) {
dev_err(dai->dev, "Creating IEC958 channel status failed %d\n",
ret);
return ret;
}
val = cs[0] | cs[1] << 8 | cs[2] << 16 | cs[3] << 24;
/* Setup channel status A bits [31 - 0]*/
regmap_write(priv->map, SPDIFOUT_CHSTS0, val);
/* Clear channel status A bits [191 - 32] */
for (offset = SPDIFOUT_CHSTS1; offset <= SPDIFOUT_CHSTS5;
offset += regmap_get_reg_stride(priv->map))
regmap_write(priv->map, offset, 0);
/* Setup channel status B bits [31 - 0]*/
regmap_write(priv->map, SPDIFOUT_CHSTS6, val);
/* Clear channel status B bits [191 - 32] */
for (offset = SPDIFOUT_CHSTS7; offset <= SPDIFOUT_CHSTSB;
offset += regmap_get_reg_stride(priv->map))
regmap_write(priv->map, offset, 0);
return 0;
}
static int axg_spdifout_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
unsigned int rate = params_rate(params);
int ret;
/* 2 * 32bits per subframe * 2 channels = 128 */
ret = clk_set_rate(priv->mclk, rate * 128);
if (ret) {
dev_err(dai->dev, "failed to set spdif clock\n");
return ret;
}
ret = axg_spdifout_sample_fmt(params, dai);
if (ret) {
dev_err(dai->dev, "failed to setup sample format\n");
return ret;
}
ret = axg_spdifout_set_chsts(params, dai);
if (ret) {
dev_err(dai->dev, "failed to setup channel status words\n");
return ret;
}
return 0;
}
static int axg_spdifout_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
int ret;
/* Clock the spdif output block */
ret = clk_prepare_enable(priv->pclk);
if (ret) {
dev_err(dai->dev, "failed to enable pclk\n");
return ret;
}
/* Make sure the block is initially stopped */
axg_spdifout_disable(priv->map);
/* Insert data from bit 27 lsb first */
regmap_update_bits(priv->map, SPDIFOUT_CTRL0,
SPDIFOUT_CTRL0_MSB_FIRST | SPDIFOUT_CTRL0_DATA_SEL,
0);
/* Manual control of V, C and U, U = 0 */
regmap_update_bits(priv->map, SPDIFOUT_CTRL0,
SPDIFOUT_CTRL0_CHSTS_SEL | SPDIFOUT_CTRL0_VSEL |
SPDIFOUT_CTRL0_USEL | SPDIFOUT_CTRL0_USET,
0);
/* Static SWAP configuration ATM */
regmap_write(priv->map, SPDIFOUT_SWAP, 0x10);
return 0;
}
static void axg_spdifout_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
clk_disable_unprepare(priv->pclk);
}
static const struct snd_soc_dai_ops axg_spdifout_ops = {
.trigger = axg_spdifout_trigger,
.mute_stream = axg_spdifout_mute,
.hw_params = axg_spdifout_hw_params,
.startup = axg_spdifout_startup,
.shutdown = axg_spdifout_shutdown,
.no_capture_mute = 1,
};
static struct snd_soc_dai_driver axg_spdifout_dai_drv[] = {
{
.name = "SPDIF Output",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 2,
.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_S8 |
SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S20_LE |
SNDRV_PCM_FMTBIT_S24_LE),
},
.ops = &axg_spdifout_ops,
},
};
static const char * const spdifout_sel_texts[] = {
"IN 0", "IN 1", "IN 2",
};
static SOC_ENUM_SINGLE_DECL(axg_spdifout_sel_enum, SPDIFOUT_CTRL1, 24,
spdifout_sel_texts);
static const struct snd_kcontrol_new axg_spdifout_in_mux =
SOC_DAPM_ENUM("Input Source", axg_spdifout_sel_enum);
static const struct snd_soc_dapm_widget axg_spdifout_dapm_widgets[] = {
SND_SOC_DAPM_AIF_IN("IN 0", NULL, 0, SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_AIF_IN("IN 1", NULL, 0, SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_AIF_IN("IN 2", NULL, 0, SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_MUX("SRC SEL", SND_SOC_NOPM, 0, 0, &axg_spdifout_in_mux),
};
static const struct snd_soc_dapm_route axg_spdifout_dapm_routes[] = {
{ "SRC SEL", "IN 0", "IN 0" },
{ "SRC SEL", "IN 1", "IN 1" },
{ "SRC SEL", "IN 2", "IN 2" },
{ "Playback", NULL, "SRC SEL" },
};
static const struct snd_kcontrol_new axg_spdifout_controls[] = {
SOC_DOUBLE("Playback Volume", SPDIFOUT_GAIN0, 0, 8, 255, 0),
SOC_DOUBLE("Playback Switch", SPDIFOUT_CTRL0, 22, 21, 1, 1),
SOC_SINGLE("Playback Gain Enable Switch",
SPDIFOUT_CTRL1, 26, 1, 0),
SOC_SINGLE("Playback Channels Mix Switch",
SPDIFOUT_CTRL0, 23, 1, 0),
};
static int axg_spdifout_set_bias_level(struct snd_soc_component *component,
enum snd_soc_bias_level level)
{
struct axg_spdifout *priv = snd_soc_component_get_drvdata(component);
enum snd_soc_bias_level now =
snd_soc_component_get_bias_level(component);
int ret = 0;
switch (level) {
case SND_SOC_BIAS_PREPARE:
if (now == SND_SOC_BIAS_STANDBY)
ret = clk_prepare_enable(priv->mclk);
break;
case SND_SOC_BIAS_STANDBY:
if (now == SND_SOC_BIAS_PREPARE)
clk_disable_unprepare(priv->mclk);
break;
case SND_SOC_BIAS_OFF:
case SND_SOC_BIAS_ON:
break;
}
return ret;
}
static const struct snd_soc_component_driver axg_spdifout_component_drv = {
.controls = axg_spdifout_controls,
.num_controls = ARRAY_SIZE(axg_spdifout_controls),
.dapm_widgets = axg_spdifout_dapm_widgets,
.num_dapm_widgets = ARRAY_SIZE(axg_spdifout_dapm_widgets),
.dapm_routes = axg_spdifout_dapm_routes,
.num_dapm_routes = ARRAY_SIZE(axg_spdifout_dapm_routes),
.set_bias_level = axg_spdifout_set_bias_level,
.legacy_dai_naming = 1,
};
static const struct regmap_config axg_spdifout_regmap_cfg = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = SPDIFOUT_MUTE_VAL,
};
static const struct of_device_id axg_spdifout_of_match[] = {
{ .compatible = "amlogic,axg-spdifout", },
{}
};
MODULE_DEVICE_TABLE(of, axg_spdifout_of_match);
static int axg_spdifout_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct axg_spdifout *priv;
void __iomem *regs;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(regs))
return PTR_ERR(regs);
priv->map = devm_regmap_init_mmio(dev, regs, &axg_spdifout_regmap_cfg);
if (IS_ERR(priv->map)) {
dev_err(dev, "failed to init regmap: %ld\n",
PTR_ERR(priv->map));
return PTR_ERR(priv->map);
}
priv->pclk = devm_clk_get(dev, "pclk");
if (IS_ERR(priv->pclk))
return dev_err_probe(dev, PTR_ERR(priv->pclk), "failed to get pclk\n");
priv->mclk = devm_clk_get(dev, "mclk");
if (IS_ERR(priv->mclk))
return dev_err_probe(dev, PTR_ERR(priv->mclk), "failed to get mclk\n");
return devm_snd_soc_register_component(dev, &axg_spdifout_component_drv,
axg_spdifout_dai_drv, ARRAY_SIZE(axg_spdifout_dai_drv));
}
static struct platform_driver axg_spdifout_pdrv = {
.probe = axg_spdifout_probe,
.driver = {
.name = "axg-spdifout",
.of_match_table = axg_spdifout_of_match,
},
};
module_platform_driver(axg_spdifout_pdrv);
MODULE_DESCRIPTION("Amlogic AXG SPDIF Output driver");
MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
MODULE_LICENSE("GPL v2");