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-rw-r--r--sound/soc/rockchip/rockchip_pdm.c627
1 files changed, 627 insertions, 0 deletions
diff --git a/sound/soc/rockchip/rockchip_pdm.c b/sound/soc/rockchip/rockchip_pdm.c
new file mode 100644
index 000000000..94cfbc903
--- /dev/null
+++ b/sound/soc/rockchip/rockchip_pdm.c
@@ -0,0 +1,627 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Rockchip PDM ALSA SoC Digital Audio Interface(DAI) driver
+ *
+ * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/rational.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+
+#include "rockchip_pdm.h"
+
+#define PDM_DMA_BURST_SIZE (8) /* size * width: 8*4 = 32 bytes */
+#define PDM_SIGNOFF_CLK_RATE (100000000)
+
+enum rk_pdm_version {
+ RK_PDM_RK3229,
+ RK_PDM_RK3308,
+};
+
+struct rk_pdm_dev {
+ struct device *dev;
+ struct clk *clk;
+ struct clk *hclk;
+ struct regmap *regmap;
+ struct snd_dmaengine_dai_dma_data capture_dma_data;
+ struct reset_control *reset;
+ enum rk_pdm_version version;
+};
+
+struct rk_pdm_clkref {
+ unsigned int sr;
+ unsigned int clk;
+ unsigned int clk_out;
+};
+
+struct rk_pdm_ds_ratio {
+ unsigned int ratio;
+ unsigned int sr;
+};
+
+static struct rk_pdm_clkref clkref[] = {
+ { 8000, 40960000, 2048000 },
+ { 11025, 56448000, 2822400 },
+ { 12000, 61440000, 3072000 },
+ { 8000, 98304000, 2048000 },
+ { 12000, 98304000, 3072000 },
+};
+
+static struct rk_pdm_ds_ratio ds_ratio[] = {
+ { 0, 192000 },
+ { 0, 176400 },
+ { 0, 128000 },
+ { 1, 96000 },
+ { 1, 88200 },
+ { 1, 64000 },
+ { 2, 48000 },
+ { 2, 44100 },
+ { 2, 32000 },
+ { 3, 24000 },
+ { 3, 22050 },
+ { 3, 16000 },
+ { 4, 12000 },
+ { 4, 11025 },
+ { 4, 8000 },
+};
+
+static unsigned int get_pdm_clk(struct rk_pdm_dev *pdm, unsigned int sr,
+ unsigned int *clk_src, unsigned int *clk_out)
+{
+ unsigned int i, count, clk, div, rate;
+
+ clk = 0;
+ if (!sr)
+ return clk;
+
+ count = ARRAY_SIZE(clkref);
+ for (i = 0; i < count; i++) {
+ if (sr % clkref[i].sr)
+ continue;
+ div = sr / clkref[i].sr;
+ if ((div & (div - 1)) == 0) {
+ *clk_out = clkref[i].clk_out;
+ rate = clk_round_rate(pdm->clk, clkref[i].clk);
+ if (rate != clkref[i].clk)
+ continue;
+ clk = clkref[i].clk;
+ *clk_src = clkref[i].clk;
+ break;
+ }
+ }
+
+ if (!clk) {
+ clk = clk_round_rate(pdm->clk, PDM_SIGNOFF_CLK_RATE);
+ *clk_src = clk;
+ }
+ return clk;
+}
+
+static unsigned int get_pdm_ds_ratio(unsigned int sr)
+{
+ unsigned int i, count, ratio;
+
+ ratio = 0;
+ if (!sr)
+ return ratio;
+
+ count = ARRAY_SIZE(ds_ratio);
+ for (i = 0; i < count; i++) {
+ if (sr == ds_ratio[i].sr)
+ ratio = ds_ratio[i].ratio;
+ }
+ return ratio;
+}
+
+static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
+{
+ return snd_soc_dai_get_drvdata(dai);
+}
+
+static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on)
+{
+ if (on) {
+ regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
+ PDM_DMA_RD_MSK, PDM_DMA_RD_EN);
+ regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
+ PDM_RX_MASK, PDM_RX_START);
+ } else {
+ regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
+ PDM_DMA_RD_MSK, PDM_DMA_RD_DIS);
+ regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
+ PDM_RX_MASK | PDM_RX_CLR_MASK,
+ PDM_RX_STOP | PDM_RX_CLR_WR);
+ }
+}
+
+static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct rk_pdm_dev *pdm = to_info(dai);
+ unsigned int val = 0;
+ unsigned int clk_rate, clk_div, samplerate;
+ unsigned int clk_src, clk_out = 0;
+ unsigned long m, n;
+ bool change;
+ int ret;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ return 0;
+
+ samplerate = params_rate(params);
+ clk_rate = get_pdm_clk(pdm, samplerate, &clk_src, &clk_out);
+ if (!clk_rate)
+ return -EINVAL;
+
+ ret = clk_set_rate(pdm->clk, clk_src);
+ if (ret)
+ return -EINVAL;
+
+ if (pdm->version == RK_PDM_RK3308) {
+ rational_best_approximation(clk_out, clk_src,
+ GENMASK(16 - 1, 0),
+ GENMASK(16 - 1, 0),
+ &m, &n);
+
+ val = (m << PDM_FD_NUMERATOR_SFT) |
+ (n << PDM_FD_DENOMINATOR_SFT);
+ regmap_update_bits_check(pdm->regmap, PDM_CTRL1,
+ PDM_FD_NUMERATOR_MSK |
+ PDM_FD_DENOMINATOR_MSK,
+ val, &change);
+ if (change) {
+ reset_control_assert(pdm->reset);
+ reset_control_deassert(pdm->reset);
+ rockchip_pdm_rxctrl(pdm, 0);
+ }
+ clk_div = n / m;
+ if (clk_div >= 40)
+ val = PDM_CLK_FD_RATIO_40;
+ else if (clk_div <= 35)
+ val = PDM_CLK_FD_RATIO_35;
+ else
+ return -EINVAL;
+ regmap_update_bits(pdm->regmap, PDM_CLK_CTRL,
+ PDM_CLK_FD_RATIO_MSK,
+ val);
+ }
+ val = get_pdm_ds_ratio(samplerate);
+ regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
+ regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
+ PDM_HPF_CF_MSK, PDM_HPF_60HZ);
+ regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
+ PDM_HPF_LE | PDM_HPF_RE, PDM_HPF_LE | PDM_HPF_RE);
+ regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN);
+ if (pdm->version != RK_PDM_RK3229)
+ regmap_update_bits(pdm->regmap, PDM_CTRL0,
+ PDM_MODE_MSK, PDM_MODE_LJ);
+
+ val = 0;
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S8:
+ val |= PDM_VDW(8);
+ break;
+ case SNDRV_PCM_FORMAT_S16_LE:
+ val |= PDM_VDW(16);
+ break;
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ val |= PDM_VDW(20);
+ break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ val |= PDM_VDW(24);
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ val |= PDM_VDW(32);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (params_channels(params)) {
+ case 8:
+ val |= PDM_PATH3_EN;
+ fallthrough;
+ case 6:
+ val |= PDM_PATH2_EN;
+ fallthrough;
+ case 4:
+ val |= PDM_PATH1_EN;
+ fallthrough;
+ case 2:
+ val |= PDM_PATH0_EN;
+ break;
+ default:
+ dev_err(pdm->dev, "invalid channel: %d\n",
+ params_channels(params));
+ return -EINVAL;
+ }
+
+ regmap_update_bits(pdm->regmap, PDM_CTRL0,
+ PDM_PATH_MSK | PDM_VDW_MSK,
+ val);
+ /* all channels share the single FIFO */
+ regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
+ PDM_DMA_RDL(8 * params_channels(params)));
+
+ return 0;
+}
+
+static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai,
+ unsigned int fmt)
+{
+ struct rk_pdm_dev *pdm = to_info(cpu_dai);
+ unsigned int mask = 0, val = 0;
+
+ mask = PDM_CKP_MSK;
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ val = PDM_CKP_NORMAL;
+ break;
+ case SND_SOC_DAIFMT_IB_NF:
+ val = PDM_CKP_INVERTED;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ pm_runtime_get_sync(cpu_dai->dev);
+ regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val);
+ pm_runtime_put(cpu_dai->dev);
+
+ return 0;
+}
+
+static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct rk_pdm_dev *pdm = to_info(dai);
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ rockchip_pdm_rxctrl(pdm, 1);
+ break;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ rockchip_pdm_rxctrl(pdm, 0);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai)
+{
+ struct rk_pdm_dev *pdm = to_info(dai);
+
+ dai->capture_dma_data = &pdm->capture_dma_data;
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops rockchip_pdm_dai_ops = {
+ .set_fmt = rockchip_pdm_set_fmt,
+ .trigger = rockchip_pdm_trigger,
+ .hw_params = rockchip_pdm_hw_params,
+};
+
+#define ROCKCHIP_PDM_RATES SNDRV_PCM_RATE_8000_192000
+#define ROCKCHIP_PDM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+ SNDRV_PCM_FMTBIT_S20_3LE | \
+ SNDRV_PCM_FMTBIT_S24_LE | \
+ SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_soc_dai_driver rockchip_pdm_dai = {
+ .probe = rockchip_pdm_dai_probe,
+ .capture = {
+ .stream_name = "Capture",
+ .channels_min = 2,
+ .channels_max = 8,
+ .rates = ROCKCHIP_PDM_RATES,
+ .formats = ROCKCHIP_PDM_FORMATS,
+ },
+ .ops = &rockchip_pdm_dai_ops,
+ .symmetric_rates = 1,
+};
+
+static const struct snd_soc_component_driver rockchip_pdm_component = {
+ .name = "rockchip-pdm",
+};
+
+static int rockchip_pdm_runtime_suspend(struct device *dev)
+{
+ struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(pdm->clk);
+ clk_disable_unprepare(pdm->hclk);
+
+ return 0;
+}
+
+static int rockchip_pdm_runtime_resume(struct device *dev)
+{
+ struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(pdm->clk);
+ if (ret) {
+ dev_err(pdm->dev, "clock enable failed %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(pdm->hclk);
+ if (ret) {
+ clk_disable_unprepare(pdm->clk);
+ dev_err(pdm->dev, "hclock enable failed %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case PDM_SYSCONFIG:
+ case PDM_CTRL0:
+ case PDM_CTRL1:
+ case PDM_CLK_CTRL:
+ case PDM_HPF_CTRL:
+ case PDM_FIFO_CTRL:
+ case PDM_DMA_CTRL:
+ case PDM_INT_EN:
+ case PDM_INT_CLR:
+ case PDM_DATA_VALID:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case PDM_SYSCONFIG:
+ case PDM_CTRL0:
+ case PDM_CTRL1:
+ case PDM_CLK_CTRL:
+ case PDM_HPF_CTRL:
+ case PDM_FIFO_CTRL:
+ case PDM_DMA_CTRL:
+ case PDM_INT_EN:
+ case PDM_INT_CLR:
+ case PDM_INT_ST:
+ case PDM_DATA_VALID:
+ case PDM_RXFIFO_DATA:
+ case PDM_VERSION:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case PDM_SYSCONFIG:
+ case PDM_FIFO_CTRL:
+ case PDM_INT_CLR:
+ case PDM_INT_ST:
+ case PDM_RXFIFO_DATA:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool rockchip_pdm_precious_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case PDM_RXFIFO_DATA:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct reg_default rockchip_pdm_reg_defaults[] = {
+ {0x04, 0x78000017},
+ {0x08, 0x0bb8ea60},
+ {0x18, 0x0000001f},
+};
+
+static const struct regmap_config rockchip_pdm_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = PDM_VERSION,
+ .reg_defaults = rockchip_pdm_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(rockchip_pdm_reg_defaults),
+ .writeable_reg = rockchip_pdm_wr_reg,
+ .readable_reg = rockchip_pdm_rd_reg,
+ .volatile_reg = rockchip_pdm_volatile_reg,
+ .precious_reg = rockchip_pdm_precious_reg,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static const struct of_device_id rockchip_pdm_match[] = {
+ { .compatible = "rockchip,pdm",
+ .data = (void *)RK_PDM_RK3229 },
+ { .compatible = "rockchip,px30-pdm",
+ .data = (void *)RK_PDM_RK3308 },
+ { .compatible = "rockchip,rk1808-pdm",
+ .data = (void *)RK_PDM_RK3308 },
+ { .compatible = "rockchip,rk3308-pdm",
+ .data = (void *)RK_PDM_RK3308 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
+
+static int rockchip_pdm_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ struct rk_pdm_dev *pdm;
+ struct resource *res;
+ void __iomem *regs;
+ int ret;
+
+ pdm = devm_kzalloc(&pdev->dev, sizeof(*pdm), GFP_KERNEL);
+ if (!pdm)
+ return -ENOMEM;
+
+ match = of_match_device(rockchip_pdm_match, &pdev->dev);
+ if (match)
+ pdm->version = (enum rk_pdm_version)match->data;
+
+ if (pdm->version == RK_PDM_RK3308) {
+ pdm->reset = devm_reset_control_get(&pdev->dev, "pdm-m");
+ if (IS_ERR(pdm->reset))
+ return PTR_ERR(pdm->reset);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+
+ pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+ &rockchip_pdm_regmap_config);
+ if (IS_ERR(pdm->regmap))
+ return PTR_ERR(pdm->regmap);
+
+ pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA;
+ pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE;
+
+ pdm->dev = &pdev->dev;
+ dev_set_drvdata(&pdev->dev, pdm);
+
+ pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk");
+ if (IS_ERR(pdm->clk))
+ return PTR_ERR(pdm->clk);
+
+ pdm->hclk = devm_clk_get(&pdev->dev, "pdm_hclk");
+ if (IS_ERR(pdm->hclk))
+ return PTR_ERR(pdm->hclk);
+
+ ret = clk_prepare_enable(pdm->hclk);
+ if (ret)
+ return ret;
+
+ pm_runtime_enable(&pdev->dev);
+ if (!pm_runtime_enabled(&pdev->dev)) {
+ ret = rockchip_pdm_runtime_resume(&pdev->dev);
+ if (ret)
+ goto err_pm_disable;
+ }
+
+ ret = devm_snd_soc_register_component(&pdev->dev,
+ &rockchip_pdm_component,
+ &rockchip_pdm_dai, 1);
+
+ if (ret) {
+ dev_err(&pdev->dev, "could not register dai: %d\n", ret);
+ goto err_suspend;
+ }
+
+ rockchip_pdm_rxctrl(pdm, 0);
+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+ if (ret) {
+ dev_err(&pdev->dev, "could not register pcm: %d\n", ret);
+ goto err_suspend;
+ }
+
+ return 0;
+
+err_suspend:
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ rockchip_pdm_runtime_suspend(&pdev->dev);
+err_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+
+ clk_disable_unprepare(pdm->hclk);
+
+ return ret;
+}
+
+static int rockchip_pdm_remove(struct platform_device *pdev)
+{
+ struct rk_pdm_dev *pdm = dev_get_drvdata(&pdev->dev);
+
+ pm_runtime_disable(&pdev->dev);
+ if (!pm_runtime_status_suspended(&pdev->dev))
+ rockchip_pdm_runtime_suspend(&pdev->dev);
+
+ clk_disable_unprepare(pdm->clk);
+ clk_disable_unprepare(pdm->hclk);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rockchip_pdm_suspend(struct device *dev)
+{
+ struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
+
+ regcache_mark_dirty(pdm->regmap);
+
+ return 0;
+}
+
+static int rockchip_pdm_resume(struct device *dev)
+{
+ struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
+ int ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ pm_runtime_put(dev);
+ return ret;
+ }
+
+ ret = regcache_sync(pdm->regmap);
+
+ pm_runtime_put(dev);
+
+ return ret;
+}
+#endif
+
+static const struct dev_pm_ops rockchip_pdm_pm_ops = {
+ SET_RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend,
+ rockchip_pdm_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
+};
+
+static struct platform_driver rockchip_pdm_driver = {
+ .probe = rockchip_pdm_probe,
+ .remove = rockchip_pdm_remove,
+ .driver = {
+ .name = "rockchip-pdm",
+ .of_match_table = of_match_ptr(rockchip_pdm_match),
+ .pm = &rockchip_pdm_pm_ops,
+ },
+};
+
+module_platform_driver(rockchip_pdm_driver);
+
+MODULE_AUTHOR("Sugar <sugar.zhang@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip PDM Controller Driver");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-27 22:25:32 +0000