--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * jh7110_pwmdac.c -- StarFive JH7110 PWM-DAC driver
+ *
+ * Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
+ *
+ * Authors: Jenny Zhang
+ * Curry Zhang
+ * Xingyu Wu <xingyu.wu@starfivetech.com>
+ * Hal Feng <hal.feng@starfivetech.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#define JH7110_PWMDAC_WDATA 0x00
+#define JH7110_PWMDAC_CTRL 0x04
+ #define JH7110_PWMDAC_ENABLE BIT(0)
+ #define JH7110_PWMDAC_SHIFT BIT(1)
+ #define JH7110_PWMDAC_DUTY_CYCLE_SHIFT 2
+ #define JH7110_PWMDAC_DUTY_CYCLE_MASK GENMASK(3, 2)
+ #define JH7110_PWMDAC_CNT_N_SHIFT 4
+ #define JH7110_PWMDAC_CNT_N_MASK GENMASK(12, 4)
+ #define JH7110_PWMDAC_DATA_CHANGE BIT(13)
+ #define JH7110_PWMDAC_DATA_MODE BIT(14)
+ #define JH7110_PWMDAC_DATA_SHIFT_SHIFT 15
+ #define JH7110_PWMDAC_DATA_SHIFT_MASK GENMASK(17, 15)
+
+enum JH7110_PWMDAC_SHIFT_VAL {
+ PWMDAC_SHIFT_8 = 0,
+ PWMDAC_SHIFT_10,
+};
+
+enum JH7110_PWMDAC_DUTY_CYCLE_VAL {
+ PWMDAC_CYCLE_LEFT = 0,
+ PWMDAC_CYCLE_RIGHT,
+ PWMDAC_CYCLE_CENTER,
+};
+
+enum JH7110_PWMDAC_CNT_N_VAL {
+ PWMDAC_SAMPLE_CNT_1 = 1,
+ PWMDAC_SAMPLE_CNT_2,
+ PWMDAC_SAMPLE_CNT_3,
+ PWMDAC_SAMPLE_CNT_512 = 512, /* max */
+};
+
+enum JH7110_PWMDAC_DATA_CHANGE_VAL {
+ NO_CHANGE = 0,
+ CHANGE,
+};
+
+enum JH7110_PWMDAC_DATA_MODE_VAL {
+ UNSIGNED_DATA = 0,
+ INVERTER_DATA_MSB,
+};
+
+enum JH7110_PWMDAC_DATA_SHIFT_VAL {
+ PWMDAC_DATA_LEFT_SHIFT_BIT_0 = 0,
+ PWMDAC_DATA_LEFT_SHIFT_BIT_1,
+ PWMDAC_DATA_LEFT_SHIFT_BIT_2,
+ PWMDAC_DATA_LEFT_SHIFT_BIT_3,
+ PWMDAC_DATA_LEFT_SHIFT_BIT_4,
+ PWMDAC_DATA_LEFT_SHIFT_BIT_5,
+ PWMDAC_DATA_LEFT_SHIFT_BIT_6,
+ PWMDAC_DATA_LEFT_SHIFT_BIT_7,
+};
+
+struct jh7110_pwmdac_cfg {
+ enum JH7110_PWMDAC_SHIFT_VAL shift;
+ enum JH7110_PWMDAC_DUTY_CYCLE_VAL duty_cycle;
+ u16 cnt_n;
+ enum JH7110_PWMDAC_DATA_CHANGE_VAL data_change;
+ enum JH7110_PWMDAC_DATA_MODE_VAL data_mode;
+ enum JH7110_PWMDAC_DATA_SHIFT_VAL data_shift;
+};
+
+struct jh7110_pwmdac_dev {
+ void __iomem *base;
+ resource_size_t mapbase;
+ struct jh7110_pwmdac_cfg cfg;
+
+ struct clk_bulk_data clks[2];
+ struct reset_control *rst_apb;
+ struct device *dev;
+ struct snd_dmaengine_dai_dma_data play_dma_data;
+ u32 saved_ctrl;
+};
+
+static inline void jh7110_pwmdac_write_reg(void __iomem *io_base, int reg, u32 val)
+{
+ writel(val, io_base + reg);
+}
+
+static inline u32 jh7110_pwmdac_read_reg(void __iomem *io_base, int reg)
+{
+ return readl(io_base + reg);
+}
+
+static void jh7110_pwmdac_set_enable(struct jh7110_pwmdac_dev *dev, bool enable)
+{
+ u32 value;
+
+ value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
+ if (enable)
+ value |= JH7110_PWMDAC_ENABLE;
+ else
+ value &= ~JH7110_PWMDAC_ENABLE;
+
+ jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
+}
+
+static void jh7110_pwmdac_set_shift(struct jh7110_pwmdac_dev *dev)
+{
+ u32 value;
+
+ value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
+ if (dev->cfg.shift == PWMDAC_SHIFT_8)
+ value &= ~JH7110_PWMDAC_SHIFT;
+ else if (dev->cfg.shift == PWMDAC_SHIFT_10)
+ value |= JH7110_PWMDAC_SHIFT;
+
+ jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
+}
+
+static void jh7110_pwmdac_set_duty_cycle(struct jh7110_pwmdac_dev *dev)
+{
+ u32 value;
+
+ value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
+ value &= ~JH7110_PWMDAC_DUTY_CYCLE_MASK;
+ value |= (dev->cfg.duty_cycle & 0x3) << JH7110_PWMDAC_DUTY_CYCLE_SHIFT;
+
+ jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
+}
+
+static void jh7110_pwmdac_set_cnt_n(struct jh7110_pwmdac_dev *dev)
+{
+ u32 value;
+
+ value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
+ value &= ~JH7110_PWMDAC_CNT_N_MASK;
+ value |= ((dev->cfg.cnt_n - 1) & 0x1ff) << JH7110_PWMDAC_CNT_N_SHIFT;
+
+ jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
+}
+
+static void jh7110_pwmdac_set_data_change(struct jh7110_pwmdac_dev *dev)
+{
+ u32 value;
+
+ value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
+ if (dev->cfg.data_change == NO_CHANGE)
+ value &= ~JH7110_PWMDAC_DATA_CHANGE;
+ else if (dev->cfg.data_change == CHANGE)
+ value |= JH7110_PWMDAC_DATA_CHANGE;
+
+ jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
+}
+
+static void jh7110_pwmdac_set_data_mode(struct jh7110_pwmdac_dev *dev)
+{
+ u32 value;
+
+ value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
+ if (dev->cfg.data_mode == UNSIGNED_DATA)
+ value &= ~JH7110_PWMDAC_DATA_MODE;
+ else if (dev->cfg.data_mode == INVERTER_DATA_MSB)
+ value |= JH7110_PWMDAC_DATA_MODE;
+
+ jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
+}
+
+static void jh7110_pwmdac_set_data_shift(struct jh7110_pwmdac_dev *dev)
+{
+ u32 value;
+
+ value = jh7110_pwmdac_read_reg(dev->base, JH7110_PWMDAC_CTRL);
+ value &= ~JH7110_PWMDAC_DATA_SHIFT_MASK;
+ value |= (dev->cfg.data_shift & 0x7) << JH7110_PWMDAC_DATA_SHIFT_SHIFT;
+
+ jh7110_pwmdac_write_reg(dev->base, JH7110_PWMDAC_CTRL, value);
+}
+
+static void jh7110_pwmdac_set(struct jh7110_pwmdac_dev *dev)
+{
+ jh7110_pwmdac_set_shift(dev);
+ jh7110_pwmdac_set_duty_cycle(dev);
+ jh7110_pwmdac_set_cnt_n(dev);
+ jh7110_pwmdac_set_enable(dev, true);
+
+ jh7110_pwmdac_set_data_change(dev);
+ jh7110_pwmdac_set_data_mode(dev);
+ jh7110_pwmdac_set_data_shift(dev);
+}
+
+static void jh7110_pwmdac_stop(struct jh7110_pwmdac_dev *dev)
+{
+ jh7110_pwmdac_set_enable(dev, false);
+}
+
+static int jh7110_pwmdac_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+ struct snd_soc_dai_link *dai_link = rtd->dai_link;
+
+ dai_link->trigger_stop = SND_SOC_TRIGGER_ORDER_LDC;
+
+ return 0;
+}
+
+static int jh7110_pwmdac_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct jh7110_pwmdac_dev *dev = dev_get_drvdata(dai->dev);
+ unsigned long core_clk_rate;
+ int ret;
+
+ switch (params_rate(params)) {
+ case 8000:
+ dev->cfg.cnt_n = PWMDAC_SAMPLE_CNT_3;
+ core_clk_rate = 6144000;
+ break;
+ case 11025:
+ dev->cfg.cnt_n = PWMDAC_SAMPLE_CNT_2;
+ core_clk_rate = 5644800;
+ break;
+ case 16000:
+ dev->cfg.cnt_n = PWMDAC_SAMPLE_CNT_3;
+ core_clk_rate = 12288000;
+ break;
+ case 22050:
+ dev->cfg.cnt_n = PWMDAC_SAMPLE_CNT_1;
+ core_clk_rate = 5644800;
+ break;
+ case 32000:
+ dev->cfg.cnt_n = PWMDAC_SAMPLE_CNT_1;
+ core_clk_rate = 8192000;
+ break;
+ case 44100:
+ dev->cfg.cnt_n = PWMDAC_SAMPLE_CNT_1;
+ core_clk_rate = 11289600;
+ break;
+ case 48000:
+ dev->cfg.cnt_n = PWMDAC_SAMPLE_CNT_1;
+ core_clk_rate = 12288000;
+ break;
+ default:
+ dev_err(dai->dev, "%d rate not supported\n",
+ params_rate(params));
+ return -EINVAL;
+ }
+
+ switch (params_channels(params)) {
+ case 1:
+ dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+ break;
+ case 2:
+ dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ break;
+ default:
+ dev_err(dai->dev, "%d channels not supported\n",
+ params_channels(params));
+ return -EINVAL;
+ }
+
+ /*
+ * The clock rate always rounds down when using clk_set_rate()
+ * so increase the rate a bit
+ */
+ core_clk_rate += 64;
+ jh7110_pwmdac_set(dev);
+
+ ret = clk_set_rate(dev->clks[1].clk, core_clk_rate);
+ if (ret)
+ return dev_err_probe(dai->dev, ret,
+ "failed to set rate %lu for core clock\n",
+ core_clk_rate);
+
+ return 0;
+}
+
+static int jh7110_pwmdac_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct jh7110_pwmdac_dev *dev = snd_soc_dai_get_drvdata(dai);
+ int ret = 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ jh7110_pwmdac_set(dev);
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ jh7110_pwmdac_stop(dev);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int jh7110_pwmdac_crg_enable(struct jh7110_pwmdac_dev *dev, bool enable)
+{
+ int ret;
+
+ if (enable) {
+ ret = clk_bulk_prepare_enable(ARRAY_SIZE(dev->clks), dev->clks);
+ if (ret)
+ return dev_err_probe(dev->dev, ret,
+ "failed to enable pwmdac clocks\n");
+
+ ret = reset_control_deassert(dev->rst_apb);
+ if (ret) {
+ dev_err(dev->dev, "failed to deassert pwmdac apb reset\n");
+ goto err_rst_apb;
+ }
+ } else {
+ clk_bulk_disable_unprepare(ARRAY_SIZE(dev->clks), dev->clks);
+ }
+
+ return 0;
+
+err_rst_apb:
+ clk_bulk_disable_unprepare(ARRAY_SIZE(dev->clks), dev->clks);
+
+ return ret;
+}
+
+static int jh7110_pwmdac_dai_probe(struct snd_soc_dai *dai)
+{
+ struct jh7110_pwmdac_dev *dev = dev_get_drvdata(dai->dev);
+
+ snd_soc_dai_init_dma_data(dai, &dev->play_dma_data, NULL);
+ snd_soc_dai_set_drvdata(dai, dev);
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops jh7110_pwmdac_dai_ops = {
+ .startup = jh7110_pwmdac_startup,
+ .hw_params = jh7110_pwmdac_hw_params,
+ .trigger = jh7110_pwmdac_trigger,
+};
+
+static const struct snd_soc_component_driver jh7110_pwmdac_component = {
+ .name = "jh7110-pwmdac",
+};
+
+static struct snd_soc_dai_driver jh7110_pwmdac_dai = {
+ .name = "jh7110-pwmdac",
+ .id = 0,
+ .probe = jh7110_pwmdac_dai_probe,
+ .playback = {
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .ops = &jh7110_pwmdac_dai_ops,
+};
+
+static int jh7110_pwmdac_runtime_suspend(struct device *dev)
+{
+ struct jh7110_pwmdac_dev *pwmdac = dev_get_drvdata(dev);
+
+ return jh7110_pwmdac_crg_enable(pwmdac, false);
+}
+
+static int jh7110_pwmdac_runtime_resume(struct device *dev)
+{
+ struct jh7110_pwmdac_dev *pwmdac = dev_get_drvdata(dev);
+
+ return jh7110_pwmdac_crg_enable(pwmdac, true);
+}
+
+static int jh7110_pwmdac_system_suspend(struct device *dev)
+{
+ struct jh7110_pwmdac_dev *pwmdac = dev_get_drvdata(dev);
+
+ /* save the CTRL register value */
+ pwmdac->saved_ctrl = jh7110_pwmdac_read_reg(pwmdac->base,
+ JH7110_PWMDAC_CTRL);
+ return pm_runtime_force_suspend(dev);
+}
+
+static int jh7110_pwmdac_system_resume(struct device *dev)
+{
+ struct jh7110_pwmdac_dev *pwmdac = dev_get_drvdata(dev);
+ int ret;
+
+ ret = pm_runtime_force_resume(dev);
+ if (ret)
+ return ret;
+
+ /* restore the CTRL register value */
+ jh7110_pwmdac_write_reg(pwmdac->base, JH7110_PWMDAC_CTRL,
+ pwmdac->saved_ctrl);
+ return 0;
+}
+
+static const struct dev_pm_ops jh7110_pwmdac_pm_ops = {
+ RUNTIME_PM_OPS(jh7110_pwmdac_runtime_suspend,
+ jh7110_pwmdac_runtime_resume, NULL)
+ SYSTEM_SLEEP_PM_OPS(jh7110_pwmdac_system_suspend,
+ jh7110_pwmdac_system_resume)
+};
+
+static void jh7110_pwmdac_init_params(struct jh7110_pwmdac_dev *dev)
+{
+ dev->cfg.shift = PWMDAC_SHIFT_8;
+ dev->cfg.duty_cycle = PWMDAC_CYCLE_CENTER;
+ dev->cfg.cnt_n = PWMDAC_SAMPLE_CNT_1;
+ dev->cfg.data_change = NO_CHANGE;
+ dev->cfg.data_mode = INVERTER_DATA_MSB;
+ dev->cfg.data_shift = PWMDAC_DATA_LEFT_SHIFT_BIT_0;
+
+ dev->play_dma_data.addr = dev->mapbase + JH7110_PWMDAC_WDATA;
+ dev->play_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ dev->play_dma_data.fifo_size = 1;
+ dev->play_dma_data.maxburst = 16;
+}
+
+static int jh7110_pwmdac_probe(struct platform_device *pdev)
+{
+ struct jh7110_pwmdac_dev *dev;
+ struct resource *res;
+ int ret;
+
+ dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
+ if (!dev)
+ return -ENOMEM;
+
+ dev->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(dev->base))
+ return PTR_ERR(dev->base);
+
+ dev->mapbase = res->start;
+
+ dev->clks[0].id = "apb";
+ dev->clks[1].id = "core";
+
+ ret = devm_clk_bulk_get(&pdev->dev, ARRAY_SIZE(dev->clks), dev->clks);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret,
+ "failed to get pwmdac clocks\n");
+
+ dev->rst_apb = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(dev->rst_apb))
+ return dev_err_probe(&pdev->dev, PTR_ERR(dev->rst_apb),
+ "failed to get pwmdac apb reset\n");
+
+ jh7110_pwmdac_init_params(dev);
+
+ dev->dev = &pdev->dev;
+ dev_set_drvdata(&pdev->dev, dev);
+ ret = devm_snd_soc_register_component(&pdev->dev,
+ &jh7110_pwmdac_component,
+ &jh7110_pwmdac_dai, 1);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret, "failed to register dai\n");
+
+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+ if (ret)
+ return dev_err_probe(&pdev->dev, ret, "failed to register pcm\n");
+
+ pm_runtime_enable(dev->dev);
+ if (!pm_runtime_enabled(&pdev->dev)) {
+ ret = jh7110_pwmdac_runtime_resume(&pdev->dev);
+ if (ret)
+ goto err_pm_disable;
+ }
+
+ return 0;
+
+err_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+
+ return ret;
+}
+
+static int jh7110_pwmdac_remove(struct platform_device *pdev)
+{
+ pm_runtime_disable(&pdev->dev);
+ return 0;
+}
+
+static const struct of_device_id jh7110_pwmdac_of_match[] = {
+ { .compatible = "starfive,jh7110-pwmdac" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, jh7110_pwmdac_of_match);
+
+static struct platform_driver jh7110_pwmdac_driver = {
+ .driver = {
+ .name = "jh7110-pwmdac",
+ .of_match_table = jh7110_pwmdac_of_match,
+ .pm = pm_ptr(&jh7110_pwmdac_pm_ops),
+ },
+ .probe = jh7110_pwmdac_probe,
+ .remove = jh7110_pwmdac_remove,
+};
+module_platform_driver(jh7110_pwmdac_driver);
+
+MODULE_AUTHOR("Jenny Zhang");
+MODULE_AUTHOR("Curry Zhang");
+MODULE_AUTHOR("Xingyu Wu <xingyu.wu@starfivetech.com>");
+MODULE_AUTHOR("Hal Feng <hal.feng@starfivetech.com>");
+MODULE_DESCRIPTION("StarFive JH7110 PWM-DAC driver");
+MODULE_LICENSE("GPL");
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