// SPDX-License-Identifier: GPL-2.0-or-later
//
// This driver supports the DMIC in Allwinner's H6 SoCs.
//
// Copyright 2021 Ban Tao <fengzheng923@gmail.com>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/of_device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#define SUN50I_DMIC_EN_CTL (0x00)
#define SUN50I_DMIC_EN_CTL_GLOBE BIT(8)
#define SUN50I_DMIC_EN_CTL_CHAN(v) ((v) << 0)
#define SUN50I_DMIC_EN_CTL_CHAN_MASK GENMASK(7, 0)
#define SUN50I_DMIC_SR (0x04)
#define SUN50I_DMIC_SR_SAMPLE_RATE(v) ((v) << 0)
#define SUN50I_DMIC_SR_SAMPLE_RATE_MASK GENMASK(2, 0)
#define SUN50I_DMIC_CTL (0x08)
#define SUN50I_DMIC_CTL_OVERSAMPLE_RATE BIT(0)
#define SUN50I_DMIC_DATA (0x10)
#define SUN50I_DMIC_INTC (0x14)
#define SUN50I_DMIC_FIFO_DRQ_EN BIT(2)
#define SUN50I_DMIC_INT_STA (0x18)
#define SUN50I_DMIC_INT_STA_OVERRUN_IRQ_PENDING BIT(1)
#define SUN50I_DMIC_INT_STA_DATA_IRQ_PENDING BIT(0)
#define SUN50I_DMIC_RXFIFO_CTL (0x1c)
#define SUN50I_DMIC_RXFIFO_CTL_FLUSH BIT(31)
#define SUN50I_DMIC_RXFIFO_CTL_MODE_MASK BIT(9)
#define SUN50I_DMIC_RXFIFO_CTL_MODE_LSB (0 << 9)
#define SUN50I_DMIC_RXFIFO_CTL_MODE_MSB (1 << 9)
#define SUN50I_DMIC_RXFIFO_CTL_SAMPLE_MASK BIT(8)
#define SUN50I_DMIC_RXFIFO_CTL_SAMPLE_16 (0 << 8)
#define SUN50I_DMIC_RXFIFO_CTL_SAMPLE_24 (1 << 8)
#define SUN50I_DMIC_CH_NUM (0x24)
#define SUN50I_DMIC_CH_NUM_N(v) ((v) << 0)
#define SUN50I_DMIC_CH_NUM_N_MASK GENMASK(2, 0)
#define SUN50I_DMIC_CNT (0x2c)
#define SUN50I_DMIC_CNT_N (1 << 0)
#define SUN50I_DMIC_HPF_CTRL (0x38)
#define SUN50I_DMIC_VERSION (0x50)
struct sun50i_dmic_dev {
struct clk *dmic_clk;
struct clk *bus_clk;
struct reset_control *rst;
struct regmap *regmap;
struct snd_dmaengine_dai_dma_data dma_params_rx;
};
struct dmic_rate {
unsigned int samplerate;
unsigned int rate_bit;
};
static const struct dmic_rate dmic_rate_s[] = {
{48000, 0x0},
{44100, 0x0},
{32000, 0x1},
{24000, 0x2},
{22050, 0x2},
{16000, 0x3},
{12000, 0x4},
{11025, 0x4},
{8000, 0x5},
};
static int sun50i_dmic_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
/* only support capture */
if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
return -EINVAL;
regmap_update_bits(host->regmap, SUN50I_DMIC_RXFIFO_CTL,
SUN50I_DMIC_RXFIFO_CTL_FLUSH,
SUN50I_DMIC_RXFIFO_CTL_FLUSH);
regmap_write(host->regmap, SUN50I_DMIC_CNT, SUN50I_DMIC_CNT_N);
return 0;
}
static int sun50i_dmic_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *cpu_dai)
{
int i = 0;
unsigned long rate = params_rate(params);
unsigned int mclk = 0;
unsigned int channels = params_channels(params);
unsigned int chan_en = (1 << channels) - 1;
struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
/* DMIC num is N+1 */
regmap_update_bits(host->regmap, SUN50I_DMIC_CH_NUM,
SUN50I_DMIC_CH_NUM_N_MASK,
SUN50I_DMIC_CH_NUM_N(channels - 1));
regmap_write(host->regmap, SUN50I_DMIC_HPF_CTRL, chan_en);
regmap_update_bits(host->regmap, SUN50I_DMIC_EN_CTL,
SUN50I_DMIC_EN_CTL_CHAN_MASK,
SUN50I_DMIC_EN_CTL_CHAN(chan_en));
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
regmap_update_bits(host->regmap, SUN50I_DMIC_RXFIFO_CTL,
SUN50I_DMIC_RXFIFO_CTL_SAMPLE_MASK,
SUN50I_DMIC_RXFIFO_CTL_SAMPLE_16);
break;
case SNDRV_PCM_FORMAT_S24_LE:
regmap_update_bits(host->regmap, SUN50I_DMIC_RXFIFO_CTL,
SUN50I_DMIC_RXFIFO_CTL_SAMPLE_MASK,
SUN50I_DMIC_RXFIFO_CTL_SAMPLE_24);
break;
default:
dev_err(cpu_dai->dev, "Invalid format!\n");
return -EINVAL;
}
/* The hardware supports FIFO mode 1 for 24-bit samples */
regmap_update_bits(host->regmap, SUN50I_DMIC_RXFIFO_CTL,
SUN50I_DMIC_RXFIFO_CTL_MODE_MASK,
SUN50I_DMIC_RXFIFO_CTL_MODE_MSB);
switch (rate) {
case 11025:
case 22050:
case 44100:
mclk = 22579200;
break;
case 8000:
case 12000:
case 16000:
case 24000:
case 32000:
case 48000:
mclk = 24576000;
break;
default:
dev_err(cpu_dai->dev, "Invalid rate!\n");
return -EINVAL;
}
if (clk_set_rate(host->dmic_clk, mclk)) {
dev_err(cpu_dai->dev, "mclk : %u not support\n", mclk);
return -EINVAL;
}
for (i = 0; i < ARRAY_SIZE(dmic_rate_s); i++) {
if (dmic_rate_s[i].samplerate == rate) {
regmap_update_bits(host->regmap, SUN50I_DMIC_SR,
SUN50I_DMIC_SR_SAMPLE_RATE_MASK,
SUN50I_DMIC_SR_SAMPLE_RATE(dmic_rate_s[i].rate_bit));
break;
}
}
switch (params_physical_width(params)) {
case 16:
host->dma_params_rx.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
break;
case 32:
host->dma_params_rx.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
break;
default:
dev_err(cpu_dai->dev, "Unsupported physical sample width: %d\n",
params_physical_width(params));
return -EINVAL;
}
/* oversamplerate adjust */
if (params_rate(params) >= 24000)
regmap_update_bits(host->regmap, SUN50I_DMIC_CTL,
SUN50I_DMIC_CTL_OVERSAMPLE_RATE,
SUN50I_DMIC_CTL_OVERSAMPLE_RATE);
else
regmap_update_bits(host->regmap, SUN50I_DMIC_CTL,
SUN50I_DMIC_CTL_OVERSAMPLE_RATE, 0);
return 0;
}
static int sun50i_dmic_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
int ret = 0;
struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(dai);
if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
return -EINVAL;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
/* DRQ ENABLE */
regmap_update_bits(host->regmap, SUN50I_DMIC_INTC,
SUN50I_DMIC_FIFO_DRQ_EN,
SUN50I_DMIC_FIFO_DRQ_EN);
/* Global enable */
regmap_update_bits(host->regmap, SUN50I_DMIC_EN_CTL,
SUN50I_DMIC_EN_CTL_GLOBE,
SUN50I_DMIC_EN_CTL_GLOBE);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
/* DRQ DISABLE */
regmap_update_bits(host->regmap, SUN50I_DMIC_INTC,
SUN50I_DMIC_FIFO_DRQ_EN, 0);
/* Global disable */
regmap_update_bits(host->regmap, SUN50I_DMIC_EN_CTL,
SUN50I_DMIC_EN_CTL_GLOBE, 0);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int sun50i_dmic_soc_dai_probe(struct snd_soc_dai *dai)
{
struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(dai);
snd_soc_dai_init_dma_data(dai, NULL, &host->dma_params_rx);
return 0;
}
static const struct snd_soc_dai_ops sun50i_dmic_dai_ops = {
.startup = sun50i_dmic_startup,
.trigger = sun50i_dmic_trigger,
.hw_params = sun50i_dmic_hw_params,
};
static const struct regmap_config sun50i_dmic_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = SUN50I_DMIC_VERSION,
.cache_type = REGCACHE_NONE,
};
#define SUN50I_DMIC_RATES (SNDRV_PCM_RATE_8000_48000)
#define SUN50I_DMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)
static struct snd_soc_dai_driver sun50i_dmic_dai = {
.capture = {
.channels_min = 1,
.channels_max = 8,
.rates = SUN50I_DMIC_RATES,
.formats = SUN50I_DMIC_FORMATS,
.sig_bits = 21,
},
.probe = sun50i_dmic_soc_dai_probe,
.ops = &sun50i_dmic_dai_ops,
.name = "dmic",
};
static const struct of_device_id sun50i_dmic_of_match[] = {
{
.compatible = "allwinner,sun50i-h6-dmic",
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sun50i_dmic_of_match);
static const struct snd_soc_component_driver sun50i_dmic_component = {
.name = "sun50i-dmic",
};
static int sun50i_dmic_runtime_suspend(struct device *dev)
{
struct sun50i_dmic_dev *host = dev_get_drvdata(dev);
clk_disable_unprepare(host->dmic_clk);
clk_disable_unprepare(host->bus_clk);
return 0;
}
static int sun50i_dmic_runtime_resume(struct device *dev)
{
struct sun50i_dmic_dev *host = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(host->dmic_clk);
if (ret)
return ret;
ret = clk_prepare_enable(host->bus_clk);
if (ret) {
clk_disable_unprepare(host->dmic_clk);
return ret;
}
return 0;
}
static int sun50i_dmic_probe(struct platform_device *pdev)
{
struct sun50i_dmic_dev *host;
struct resource *res;
int ret;
void __iomem *base;
host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
if (!host)
return -ENOMEM;
/* Get the addresses */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base))
return dev_err_probe(&pdev->dev, PTR_ERR(base),
"get resource failed.\n");
host->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&sun50i_dmic_regmap_config);
/* Clocks */
host->bus_clk = devm_clk_get(&pdev->dev, "bus");
if (IS_ERR(host->bus_clk))
return dev_err_probe(&pdev->dev, PTR_ERR(host->bus_clk),
"failed to get bus clock.\n");
host->dmic_clk = devm_clk_get(&pdev->dev, "mod");
if (IS_ERR(host->dmic_clk))
return dev_err_probe(&pdev->dev, PTR_ERR(host->dmic_clk),
"failed to get dmic clock.\n");
host->dma_params_rx.addr = res->start + SUN50I_DMIC_DATA;
host->dma_params_rx.maxburst = 8;
platform_set_drvdata(pdev, host);
host->rst = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
if (IS_ERR(host->rst))
return dev_err_probe(&pdev->dev, PTR_ERR(host->rst),
"Failed to get reset.\n");
reset_control_deassert(host->rst);
ret = devm_snd_soc_register_component(&pdev->dev, &sun50i_dmic_component,
&sun50i_dmic_dai, 1);
if (ret)
return dev_err_probe(&pdev->dev, ret,
"failed to register component.\n");
pm_runtime_enable(&pdev->dev);
if (!pm_runtime_enabled(&pdev->dev)) {
ret = sun50i_dmic_runtime_resume(&pdev->dev);
if (ret)
goto err_disable_runtime_pm;
}
ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
if (ret)
goto err_suspend;
return 0;
err_suspend:
if (!pm_runtime_status_suspended(&pdev->dev))
sun50i_dmic_runtime_suspend(&pdev->dev);
err_disable_runtime_pm:
pm_runtime_disable(&pdev->dev);
return ret;
}
static int sun50i_dmic_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
if (!pm_runtime_status_suspended(&pdev->dev))
sun50i_dmic_runtime_suspend(&pdev->dev);
return 0;
}
static const struct dev_pm_ops sun50i_dmic_pm = {
SET_RUNTIME_PM_OPS(sun50i_dmic_runtime_suspend,
sun50i_dmic_runtime_resume, NULL)
};
static struct platform_driver sun50i_dmic_driver = {
.driver = {
.name = "sun50i-dmic",
.of_match_table = of_match_ptr(sun50i_dmic_of_match),
.pm = &sun50i_dmic_pm,
},
.probe = sun50i_dmic_probe,
.remove = sun50i_dmic_remove,
};
module_platform_driver(sun50i_dmic_driver);
MODULE_DESCRIPTION("Allwinner sun50i DMIC SoC Interface");
MODULE_AUTHOR("Ban Tao <fengzheng923@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:sun50i-dmic");
