[PATCH 1/2] ASoC: sunxi: Add Allwinner H6 Digital MIC driver
Samuel Holland
samuel at sholland.org
Tue Jun 15 20:06:09 PDT 2021
Hello,
On 6/15/21 8:03 AM, Ban Tao wrote:
> The Allwinner H6 and later SoCs have an DMIC block
> which is capable of capture.
>
> Signed-off-by: Ban Tao <fengzheng923 at gmail.com>
> ---
> MAINTAINERS | 7 +
> sound/soc/sunxi/Kconfig | 8 +
> sound/soc/sunxi/Makefile | 1 +
> sound/soc/sunxi/sun50i-dmic.c | 408 ++++++++++++++++++++++++++++++++++
> 4 files changed, 424 insertions(+)
> create mode 100644 sound/soc/sunxi/sun50i-dmic.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b4094f07214e..1b87225c39b0 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -760,6 +760,13 @@ L: linux-media at vger.kernel.org
> S: Maintained
> F: drivers/staging/media/sunxi/cedrus/
>
> +ALLWINNER DMIC DRIVERS
> +M: Ban Tao <fengzheng923 at gmail.com>
> +L: alsa-devel at 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 at twiddle.net>
> M: Ivan Kokshaysky <ink at 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..78d512d93974
> --- /dev/null
> +++ b/sound/soc/sunxi/sun50i-dmic.c
> @@ -0,0 +1,408 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * ALSA SoC DMIC Audio Layer
> + *
> + * Copyright 2021 Ban Tao <fengzheng923 at 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)
> +#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 platform_device *pdev;
> + struct clk *dmic_clk;
> + struct clk *apb_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 void sun50i_snd_rxctrl_enable(struct snd_pcm_substream *substream,
> + struct sun50i_dmic_dev *host, bool enable)
> +{
> + if (enable) {
> + /* 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);
> + } else {
> + /* 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);
> + }
> +}
> +
> +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(rtd->cpu_dai);
This is equivalent to the simpler code you use below:
struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
> +
> + /* only support capture */
> + if (substream->stream != SNDRV_PCM_STREAM_CAPTURE)
> + return -EINVAL;
> +
> + regmap_write(host->regmap, SUN50I_DMIC_INT_STA,
> + SUN50I_DMIC_INT_STA_OVERRUN_IRQ_PENDING |
> + SUN50I_DMIC_INT_STA_DATA_IRQ_PENDING);
The interrupt is never enabled, so do we really care about IRQ status?
> + 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 channels = params_channels(params);
> + struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(cpu_dai);
> + struct platform_device *pdev = host->pdev;
> + struct dmic_rate dmic_rate_s[] = {
> + {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);
In SNDRV_PCM_FORMAT_S24_LE, the sample is in the three least significant
bytes, so wouldn't we want to still use mode 1 here? To me, mode 0 only
makes sense when using SNDRV_PCM_FORMAT_S32_LE.
> + regmap_update_bits(host->regmap, SUN50I_DMIC_RXFIFO_CTL,
> + SUN50I_DMIC_RXFIFO_CTL_RESOLUTION,
> + SUN50I_DMIC_RXFIFO_CTL_RESOLUTION);
> + break;
> + default:
> + dev_err(&pdev->dev, "Invalid format!\n");
The calls to dev_err() can use cpu_dai->dev. Then you don't need to keep
a pointer to pdev in the driver data.
> + 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;
> + }
> + }
> + if (i == ARRAY_SIZE(dmic_rate_s)) {
> + dev_err(&pdev->dev, "Invalid rate!\n");
> + 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:
> + sun50i_snd_rxctrl_enable(substream, host, true);
> + break;
> +
> + case SNDRV_PCM_TRIGGER_STOP:
> + case SNDRV_PCM_TRIGGER_SUSPEND:
> + case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
> + sun50i_snd_rxctrl_enable(substream, host, false);
> + break;
> +
> + default:
> + ret = -EINVAL;
> + break;
> + }
> + return ret;
> +}
> +
> +static int sun50i_dmic_set_sysclk(struct snd_soc_dai *dai, int clk_id,
> + unsigned int freq, int dir)
> +{
> + struct sun50i_dmic_dev *host = snd_soc_dai_get_drvdata(dai);
> +
> + if (clk_set_rate(host->dmic_clk, freq)) {
Currently, mainline does not have any sunxi-specific machine drivers. We
are using simple-audio-card for sun50i. And asoc_simple_hw_params() only
calls .set_sysclk if mclk-fs is set to some fixed value, from the device
tree. However, for sunxi, mclk-fs cannot be a fixed value, because
sysclk is the same 22/24 MHz regardless of sample rate. So .set_sysclk
will never be called.
So for now I would suggest calling clk_set_rate() from .hw_params, using
something like sun8i_codec_get_sysclk_rate() to get the right frequency.
> + dev_err(dai->dev, "Freq : %u not support\n", freq);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +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,
> + .set_sysclk = sun50i_dmic_set_sysclk,
> +};
> +
> +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 | SNDRV_PCM_RATE_KNOT)
If you use SNDRV_PCM_RATE_KNOT, you also need to provide a list of
sample rates as a constraint in .startup.
> +#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,
> + },
> + .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->apb_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->apb_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;
> +
> + host->pdev = pdev;
> +
> + /* 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->apb_clk = devm_clk_get(&pdev->dev, "apb");
> + if (IS_ERR(host->apb_clk))
> + return dev_err_probe(&pdev->dev, PTR_ERR(host->apb_clk),
> + "failed to get apb clock.\n");
> +
> + host->dmic_clk = devm_clk_get(&pdev->dev, "dmic");
> + 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;
> + host->dma_params_rx.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
This needs to be DMA_SLAVE_BUSWIDTH_4_BYTES if you are using larger than
16-bit samples. See for example sun4i_i2s_hw_params().
Regards,
Samuel
More information about the linux-arm-kernel
mailing list