Re: [PATCH v5 1/2] ASoC: sunxi: Add Allwinner H6 Digital MIC driver

Hi,

On 7/4/21 4:21 AM, fengzheng923@gmail.com wrote:

From: Ban Tao fengzheng923@gmail.com

The Allwinner H6 and later SoCs have an DMIC block which is capable of capture.

Signed-off-by: Ban Tao fengzheng923@gmail.com

---

v1->v2: 1.Fix some compilation errors. 2.Modify some code styles.

---

v2->v3: None.

---

v3->v4:

1.add sig_bits.

v4->v5: None.

---

Thanks for the updates! The driver is looking good. I found a couple more small things (below) when reading through it again.

MAINTAINERS | 7 + sound/soc/sunxi/Kconfig | 8 + sound/soc/sunxi/Makefile | 1 + sound/soc/sunxi/sun50i-dmic.c | 405 ++++++++++++++++++++++++++++++++++ 4 files changed, 421 insertions(+) create mode 100644 sound/soc/sunxi/sun50i-dmic.c

diff --git a/MAINTAINERS b/MAINTAINERS index e924f9e5df97..8d700baaa3ca 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -760,6 +760,13 @@ L: linux-media@vger.kernel.org S: Maintained F: drivers/staging/media/sunxi/cedrus/

+ALLWINNER DMIC DRIVERS +M: Ban Tao fengzheng923@gmail.com +L: alsa-devel@alsa-project.org (moderated for non-subscribers) +S: Maintained +F: Documentation/devicetree/bindings/sound/allwinner,sun50i-h6-dmic.yaml +F: sound/soc/sunxi/sun50i-dmic.c

ALPHA PORT M: Richard Henderson rth@twiddle.net M: Ivan Kokshaysky ink@jurassic.park.msu.ru diff --git a/sound/soc/sunxi/Kconfig b/sound/soc/sunxi/Kconfig index ddcaaa98d3cb..2a3bf7722e11 100644 --- a/sound/soc/sunxi/Kconfig +++ b/sound/soc/sunxi/Kconfig @@ -56,6 +56,14 @@ config SND_SUN4I_SPDIF Say Y or M to add support for the S/PDIF audio block in the Allwinner A10 and affiliated SoCs.

+config SND_SUN50I_DMIC

• tristate "Allwinner H6 DMIC Support"
• depends on (OF && ARCH_SUNXI) || COMPILE_TEST
• select SND_SOC_GENERIC_DMAENGINE_PCM
• help

•  Say Y or M to add support for the DMIC audio block in the Allwinner
  

•  H6 and affiliated SoCs.
  

config SND_SUN8I_ADDA_PR_REGMAP tristate select REGMAP diff --git a/sound/soc/sunxi/Makefile b/sound/soc/sunxi/Makefile index a86be340a076..4483fe9c94ef 100644 --- a/sound/soc/sunxi/Makefile +++ b/sound/soc/sunxi/Makefile @@ -6,3 +6,4 @@ obj-$(CONFIG_SND_SUN8I_CODEC_ANALOG) += sun8i-codec-analog.o obj-$(CONFIG_SND_SUN50I_CODEC_ANALOG) += sun50i-codec-analog.o obj-$(CONFIG_SND_SUN8I_CODEC) += sun8i-codec.o obj-$(CONFIG_SND_SUN8I_ADDA_PR_REGMAP) += sun8i-adda-pr-regmap.o +obj-$(CONFIG_SND_SUN50I_DMIC) += sun50i-dmic.o diff --git a/sound/soc/sunxi/sun50i-dmic.c b/sound/soc/sunxi/sun50i-dmic.c new file mode 100644 index 000000000000..720d15e4b8ba --- /dev/null +++ b/sound/soc/sunxi/sun50i-dmic.c @@ -0,0 +1,405 @@ +// 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_SAMOLE_RATE(v) ((v) << 0)
• #define SUN50I_DMIC_SR_SAMOLE_RATE_MASK GENMASK(2, 0)

Typo: SAMPLE

+#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 BIT(9)
• #define SUN50I_DMIC_RXFIFO_CTL_RESOLUTION BIT(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 BIT(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;
• unsigned int chan_en;

+};

+struct dmic_rate {

• unsigned int samplerate;
• unsigned int rate_bit;

+};

+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);
• struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
• struct dmic_rate dmic_rate_s[] = {

This needs to be static, or it will get initialized every time the function is called.

• {44100, 0x0},
  

• {48000, 0x0},
  

• {22050, 0x2},
  

• {24000, 0x2},
  

• {11025, 0x4},
  

• {12000, 0x4},
  

• {32000, 0x1},
  

• {16000, 0x3},
  

• {8000,  0x5},
  

• };
• /* 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));
  

• host->chan_en = (1 << channels) - 1;
• regmap_write(host->regmap, SUN50I_DMIC_HPF_CTRL, host->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_MODE,
  

• 		   SUN50I_DMIC_RXFIFO_CTL_MODE);
  

• regmap_update_bits(host->regmap, SUN50I_DMIC_RXFIFO_CTL,
  

• 		   SUN50I_DMIC_RXFIFO_CTL_RESOLUTION, 0);
  

• break;
  

• case SNDRV_PCM_FORMAT_S24_LE:

• regmap_update_bits(host->regmap, SUN50I_DMIC_RXFIFO_CTL,
  

• 		   SUN50I_DMIC_RXFIFO_CTL_MODE, 0);
  

I still believe this should be mode 1, but I don't have any hardware to test with and know for sure.

Have you tested this driver with S24_LE? Even if it doesn't quite make sense to me, I am fine with the current code as long as it works.

With these resolved, I am happy to give my Reviewed-by.

Cheers, Samuel

• regmap_update_bits(host->regmap, SUN50I_DMIC_RXFIFO_CTL,
  

• 		   SUN50I_DMIC_RXFIFO_CTL_RESOLUTION,
  

• 		   SUN50I_DMIC_RXFIFO_CTL_RESOLUTION);
  

• break;
  

• default:

• dev_err(cpu_dai->dev, "Invalid format!\n");
  

• return -EINVAL;
  

• }
• 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_SAMOLE_RATE_MASK,
  

• 			   SUN50I_DMIC_SR_SAMOLE_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);
  

• regmap_update_bits(host->regmap, SUN50I_DMIC_EN_CTL,
  

• 		   SUN50I_DMIC_EN_CTL_CHAN_MASK,
  

• 		   SUN50I_DMIC_EN_CTL_CHAN(host->chan_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);
  

• regmap_update_bits(host->regmap, SUN50I_DMIC_EN_CTL,
  

• 		   SUN50I_DMIC_EN_CTL_CHAN_MASK,
  

• 		   SUN50I_DMIC_EN_CTL_CHAN(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_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_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;

+}

+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_unregister;
  

• }
• 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_unregister:

• 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");