--- /dev/null
+/*
+ * Rockchip PDM ALSA SoC Digital Audio Interface(DAI) driver
+ *
+ * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+
+#include "rockchip_pdm.h"
+
+#define PDM_DMA_BURST_SIZE (16) /* size * width: 16*4 = 64 bytes */
+
+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 rk_pdm_clkref {
+ unsigned int sr;
+ unsigned int clk;
+};
+
+static struct rk_pdm_clkref clkref[] = {
+ { 8000, 40960000 },
+ { 11025, 56448000 },
+ { 12000, 61440000 },
+};
+
+static unsigned int get_pdm_clk(unsigned int sr)
+{
+ unsigned int i, count, clk, div;
+
+ 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 = clkref[i].clk;
+ break;
+ }
+ }
+
+ return clk;
+}
+
+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;
+ int ret;
+
+ samplerate = params_rate(params);
+ clk_rate = get_pdm_clk(samplerate);
+ if (!clk_rate)
+ return -EINVAL;
+
+ ret = clk_set_rate(pdm->clk, clk_rate);
+ if (ret)
+ return -EINVAL;
+
+ clk_div = DIV_ROUND_CLOSEST(clk_rate, samplerate);
+
+ switch (clk_div) {
+ case 320:
+ val = PDM_CLK_320FS;
+ break;
+ case 640:
+ val = PDM_CLK_640FS;
+ break;
+ case 1280:
+ val = PDM_CLK_1280FS;
+ break;
+ case 2560:
+ val = PDM_CLK_2560FS;
+ break;
+ case 5120:
+ val = PDM_CLK_5120FS;
+ break;
+ default:
+ dev_err(pdm->dev, "unsupported div: %d\n", clk_div);
+ return -EINVAL;
+ }
+
+ 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);
+
+ 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;
+ }
+
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+ regmap_update_bits(pdm->regmap, PDM_CTRL0,
+ PDM_PATH_MSK | PDM_VDW_MSK,
+ val);
+ regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
+ PDM_DMA_RDL(16));
+ regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
+ PDM_RX_MASK | PDM_RX_CLR_MASK,
+ PDM_RX_STOP | PDM_RX_CLR_WR);
+ }
+
+ 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;
+ }
+
+ regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val);
+
+ 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 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) {
+ 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_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_INT_CLR:
+ case PDM_INT_ST:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config rockchip_pdm_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = PDM_VERSION,
+ .writeable_reg = rockchip_pdm_wr_reg,
+ .readable_reg = rockchip_pdm_rd_reg,
+ .volatile_reg = rockchip_pdm_volatile_reg,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int rockchip_pdm_probe(struct platform_device *pdev)
+{
+ 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;
+
+ 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;
+ }
+
+ 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)
+ 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 const struct of_device_id rockchip_pdm_match[] = {
+ { .compatible = "rockchip,pdm", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
+
+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");
--- /dev/null
+/*
+ * Rockchip PDM ALSA SoC Digital Audio Interface(DAI) driver
+ *
+ * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _ROCKCHIP_PDM_H
+#define _ROCKCHIP_PDM_H
+
+/* PDM REGS */
+#define PDM_SYSCONFIG (0x0000)
+#define PDM_CTRL0 (0x0004)
+#define PDM_CTRL1 (0x0008)
+#define PDM_CLK_CTRL (0x000c)
+#define PDM_HPF_CTRL (0x0010)
+#define PDM_FIFO_CTRL (0x0014)
+#define PDM_DMA_CTRL (0x0018)
+#define PDM_INT_EN (0x001c)
+#define PDM_INT_CLR (0x0020)
+#define PDM_INT_ST (0x0024)
+#define PDM_RXFIFO_DATA (0x0030)
+#define PDM_DATA_VALID (0x0054)
+#define PDM_VERSION (0x0058)
+
+/* PDM_SYSCONFIG */
+#define PDM_RX_MASK (0x1 << 2)
+#define PDM_RX_START (0x1 << 2)
+#define PDM_RX_STOP (0x0 << 2)
+#define PDM_RX_CLR_MASK (0x1 << 0)
+#define PDM_RX_CLR_WR (0x1 << 0)
+#define PDM_RX_CLR_DONE (0x0 << 0)
+
+/* PDM CTRL0 */
+#define PDM_PATH_MSK (0xf << 27)
+#define PDM_PATH3_EN BIT(30)
+#define PDM_PATH2_EN BIT(29)
+#define PDM_PATH1_EN BIT(28)
+#define PDM_PATH0_EN BIT(27)
+#define PDM_HWT_EN BIT(26)
+#define PDM_VDW_MSK (0x1f << 0)
+#define PDM_VDW(X) ((X - 1) << 0)
+
+/* PDM CLK CTRL */
+#define PDM_CLK_MSK BIT(5)
+#define PDM_CLK_EN BIT(5)
+#define PDM_CLK_DIS (0x0 << 5)
+#define PDM_CKP_MSK BIT(3)
+#define PDM_CKP_NORMAL (0x0 << 3)
+#define PDM_CKP_INVERTED BIT(3)
+#define PDM_DS_RATIO_MSK (0x7 << 0)
+#define PDM_CLK_320FS (0x0 << 0)
+#define PDM_CLK_640FS (0x1 << 0)
+#define PDM_CLK_1280FS (0x2 << 0)
+#define PDM_CLK_2560FS (0x3 << 0)
+#define PDM_CLK_5120FS (0x4 << 0)
+
+/* PDM HPF CTRL */
+#define PDM_HPF_LE BIT(3)
+#define PDM_HPF_RE BIT(2)
+#define PDM_HPF_CF_MSK (0x3 << 0)
+#define PDM_HPF_3P79HZ (0x0 << 0)
+#define PDM_HPF_60HZ (0x1 << 0)
+#define PDM_HPF_243HZ (0x2 << 0)
+#define PDM_HPF_493HZ (0x3 << 0)
+
+/* PDM DMA CTRL */
+#define PDM_DMA_RD_MSK BIT(8)
+#define PDM_DMA_RD_EN BIT(8)
+#define PDM_DMA_RD_DIS (0x0 << 8)
+#define PDM_DMA_RDL_MSK (0x7f << 0)
+#define PDM_DMA_RDL(X) ((X - 1) << 0)
+
+#endif /* _ROCKCHIP_PDM_H */
projects / firefly-linux-kernel-4.4.55.git / commitdiff