[PATCH 1/2] ASoC: sunxi: Add Allwinner H6 Digital MIC driver
班涛
fengzheng923 at gmail.com
Wed Jun 16 08:21:10 CEST 2021
Hi，
Samuel Holland <samuel at sholland.org> 于2021年6月16日周三 上午11:06写道：
> 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?
>
Ok, I will delete it .
>
> > + 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.
>
I don't understand. The DMIC does not support 32bits, why use
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.
>
Thanks, i will do it
>
> > + 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
>
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