--- /dev/null
+// 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;
+};
+
+const static 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");
projects / platform / kernel / linux-rpi.git / commitdiff