--- /dev/null
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+//
+// Copyright (c) 2018 BayLibre, SAS.
+// Author: Jerome Brunet <jbrunet@baylibre.com>
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+#include <sound/pcm_params.h>
+#include <sound/pcm_iec958.h>
+
+/*
+ * NOTE:
+ * The meaning of bits SPDIFOUT_CTRL0_XXX_SEL is actually the opposite
+ * of what the documentation says. Manual control on V, U and C bits is
+ * applied when the related sel bits are cleared
+ */
+
+#define SPDIFOUT_STAT 0x00
+#define SPDIFOUT_GAIN0 0x04
+#define SPDIFOUT_GAIN1 0x08
+#define SPDIFOUT_CTRL0 0x0c
+#define SPDIFOUT_CTRL0_EN BIT(31)
+#define SPDIFOUT_CTRL0_RST_OUT BIT(29)
+#define SPDIFOUT_CTRL0_RST_IN BIT(28)
+#define SPDIFOUT_CTRL0_USEL BIT(26)
+#define SPDIFOUT_CTRL0_USET BIT(25)
+#define SPDIFOUT_CTRL0_CHSTS_SEL BIT(24)
+#define SPDIFOUT_CTRL0_DATA_SEL BIT(20)
+#define SPDIFOUT_CTRL0_MSB_FIRST BIT(19)
+#define SPDIFOUT_CTRL0_VSEL BIT(18)
+#define SPDIFOUT_CTRL0_VSET BIT(17)
+#define SPDIFOUT_CTRL0_MASK_MASK GENMASK(11, 4)
+#define SPDIFOUT_CTRL0_MASK(x) ((x) << 4)
+#define SPDIFOUT_CTRL1 0x10
+#define SPDIFOUT_CTRL1_MSB_POS_MASK GENMASK(12, 8)
+#define SPDIFOUT_CTRL1_MSB_POS(x) ((x) << 8)
+#define SPDIFOUT_CTRL1_TYPE_MASK GENMASK(6, 4)
+#define SPDIFOUT_CTRL1_TYPE(x) ((x) << 4)
+#define SPDIFOUT_PREAMB 0x14
+#define SPDIFOUT_SWAP 0x18
+#define SPDIFOUT_CHSTS0 0x1c
+#define SPDIFOUT_CHSTS1 0x20
+#define SPDIFOUT_CHSTS2 0x24
+#define SPDIFOUT_CHSTS3 0x28
+#define SPDIFOUT_CHSTS4 0x2c
+#define SPDIFOUT_CHSTS5 0x30
+#define SPDIFOUT_CHSTS6 0x34
+#define SPDIFOUT_CHSTS7 0x38
+#define SPDIFOUT_CHSTS8 0x3c
+#define SPDIFOUT_CHSTS9 0x40
+#define SPDIFOUT_CHSTSA 0x44
+#define SPDIFOUT_CHSTSB 0x48
+#define SPDIFOUT_MUTE_VAL 0x4c
+
+struct axg_spdifout {
+ struct regmap *map;
+ struct clk *mclk;
+ struct clk *pclk;
+};
+
+static void axg_spdifout_enable(struct regmap *map)
+{
+ /* Apply both reset */
+ regmap_update_bits(map, SPDIFOUT_CTRL0,
+ SPDIFOUT_CTRL0_RST_OUT | SPDIFOUT_CTRL0_RST_IN,
+ 0);
+
+ /* Clear out reset before in reset */
+ regmap_update_bits(map, SPDIFOUT_CTRL0,
+ SPDIFOUT_CTRL0_RST_OUT, SPDIFOUT_CTRL0_RST_OUT);
+ regmap_update_bits(map, SPDIFOUT_CTRL0,
+ SPDIFOUT_CTRL0_RST_IN, SPDIFOUT_CTRL0_RST_IN);
+
+ /* Enable spdifout */
+ regmap_update_bits(map, SPDIFOUT_CTRL0, SPDIFOUT_CTRL0_EN,
+ SPDIFOUT_CTRL0_EN);
+}
+
+static void axg_spdifout_disable(struct regmap *map)
+{
+ regmap_update_bits(map, SPDIFOUT_CTRL0, SPDIFOUT_CTRL0_EN, 0);
+}
+
+static int axg_spdifout_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ axg_spdifout_enable(priv->map);
+ return 0;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ axg_spdifout_disable(priv->map);
+ return 0;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int axg_spdifout_digital_mute(struct snd_soc_dai *dai, int mute)
+{
+ struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
+
+ /* Use spdif valid bit to perform digital mute */
+ regmap_update_bits(priv->map, SPDIFOUT_CTRL0, SPDIFOUT_CTRL0_VSET,
+ mute ? SPDIFOUT_CTRL0_VSET : 0);
+
+ return 0;
+}
+
+static int axg_spdifout_sample_fmt(struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
+ unsigned int val;
+
+ /* Set the samples spdifout will pull from the FIFO */
+ switch (params_channels(params)) {
+ case 1:
+ val = SPDIFOUT_CTRL0_MASK(0x1);
+ break;
+ case 2:
+ val = SPDIFOUT_CTRL0_MASK(0x3);
+ break;
+ default:
+ dev_err(dai->dev, "too many channels for spdif dai: %u\n",
+ params_channels(params));
+ return -EINVAL;
+ }
+
+ regmap_update_bits(priv->map, SPDIFOUT_CTRL0,
+ SPDIFOUT_CTRL0_MASK_MASK, val);
+
+ /* FIFO data are arranged in chunks of 64bits */
+ switch (params_physical_width(params)) {
+ case 8:
+ /* 8 samples of 8 bits */
+ val = SPDIFOUT_CTRL1_TYPE(0);
+ break;
+ case 16:
+ /* 4 samples of 16 bits - right justified */
+ val = SPDIFOUT_CTRL1_TYPE(2);
+ break;
+ case 32:
+ /* 2 samples of 32 bits - right justified */
+ val = SPDIFOUT_CTRL1_TYPE(4);
+ break;
+ default:
+ dev_err(dai->dev, "Unsupported physical width: %u\n",
+ params_physical_width(params));
+ return -EINVAL;
+ }
+
+ /* Position of the MSB in FIFO samples */
+ val |= SPDIFOUT_CTRL1_MSB_POS(params_width(params) - 1);
+
+ regmap_update_bits(priv->map, SPDIFOUT_CTRL1,
+ SPDIFOUT_CTRL1_MSB_POS_MASK |
+ SPDIFOUT_CTRL1_TYPE_MASK, val);
+
+ regmap_update_bits(priv->map, SPDIFOUT_CTRL0,
+ SPDIFOUT_CTRL0_MSB_FIRST | SPDIFOUT_CTRL0_DATA_SEL,
+ 0);
+
+ return 0;
+}
+
+static int axg_spdifout_set_chsts(struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
+ unsigned int offset;
+ int ret;
+ u8 cs[4];
+ u32 val;
+
+ ret = snd_pcm_create_iec958_consumer_hw_params(params, cs, 4);
+ if (ret < 0) {
+ dev_err(dai->dev, "Creating IEC958 channel status failed %d\n",
+ ret);
+ return ret;
+ }
+ val = cs[0] | cs[1] << 8 | cs[2] << 16 | cs[3] << 24;
+
+ /* Setup channel status A bits [31 - 0]*/
+ regmap_write(priv->map, SPDIFOUT_CHSTS0, val);
+
+ /* Clear channel status A bits [191 - 32] */
+ for (offset = SPDIFOUT_CHSTS1; offset <= SPDIFOUT_CHSTS5;
+ offset += regmap_get_reg_stride(priv->map))
+ regmap_write(priv->map, offset, 0);
+
+ /* Setup channel status B bits [31 - 0]*/
+ regmap_write(priv->map, SPDIFOUT_CHSTS6, val);
+
+ /* Clear channel status B bits [191 - 32] */
+ for (offset = SPDIFOUT_CHSTS7; offset <= SPDIFOUT_CHSTSB;
+ offset += regmap_get_reg_stride(priv->map))
+ regmap_write(priv->map, offset, 0);
+
+ return 0;
+}
+
+static int axg_spdifout_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
+ unsigned int rate = params_rate(params);
+ int ret;
+
+ /* 2 * 32bits per subframe * 2 channels = 128 */
+ ret = clk_set_rate(priv->mclk, rate * 128);
+ if (ret) {
+ dev_err(dai->dev, "failed to set spdif clock\n");
+ return ret;
+ }
+
+ ret = axg_spdifout_sample_fmt(params, dai);
+ if (ret) {
+ dev_err(dai->dev, "failed to setup sample format\n");
+ return ret;
+ }
+
+ ret = axg_spdifout_set_chsts(params, dai);
+ if (ret) {
+ dev_err(dai->dev, "failed to setup channel status words\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int axg_spdifout_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
+ int ret;
+
+ /* Clock the spdif output block */
+ ret = clk_prepare_enable(priv->pclk);
+ if (ret) {
+ dev_err(dai->dev, "failed to enable pclk\n");
+ return ret;
+ }
+
+ /* Make sure the block is initially stopped */
+ axg_spdifout_disable(priv->map);
+
+ /* Insert data from bit 27 lsb first */
+ regmap_update_bits(priv->map, SPDIFOUT_CTRL0,
+ SPDIFOUT_CTRL0_MSB_FIRST | SPDIFOUT_CTRL0_DATA_SEL,
+ 0);
+
+ /* Manual control of V, C and U, U = 0 */
+ regmap_update_bits(priv->map, SPDIFOUT_CTRL0,
+ SPDIFOUT_CTRL0_CHSTS_SEL | SPDIFOUT_CTRL0_VSEL |
+ SPDIFOUT_CTRL0_USEL | SPDIFOUT_CTRL0_USET,
+ 0);
+
+ /* Static SWAP configuration ATM */
+ regmap_write(priv->map, SPDIFOUT_SWAP, 0x10);
+
+ return 0;
+}
+
+static void axg_spdifout_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct axg_spdifout *priv = snd_soc_dai_get_drvdata(dai);
+
+ clk_disable_unprepare(priv->pclk);
+}
+
+static const struct snd_soc_dai_ops axg_spdifout_ops = {
+ .trigger = axg_spdifout_trigger,
+ .digital_mute = axg_spdifout_digital_mute,
+ .hw_params = axg_spdifout_hw_params,
+ .startup = axg_spdifout_startup,
+ .shutdown = axg_spdifout_shutdown,
+};
+
+static struct snd_soc_dai_driver axg_spdifout_dai_drv[] = {
+ {
+ .name = "SPDIF Output",
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = (SNDRV_PCM_RATE_32000 |
+ SNDRV_PCM_RATE_44100 |
+ SNDRV_PCM_RATE_48000 |
+ SNDRV_PCM_RATE_88200 |
+ SNDRV_PCM_RATE_96000 |
+ SNDRV_PCM_RATE_176400 |
+ SNDRV_PCM_RATE_192000),
+ .formats = (SNDRV_PCM_FMTBIT_S8 |
+ SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S20_LE |
+ SNDRV_PCM_FMTBIT_S24_LE),
+ },
+ .ops = &axg_spdifout_ops,
+ },
+};
+
+static const char * const spdifout_sel_texts[] = {
+ "IN 0", "IN 1", "IN 2",
+};
+
+static SOC_ENUM_SINGLE_DECL(axg_spdifout_sel_enum, SPDIFOUT_CTRL1, 24,
+ spdifout_sel_texts);
+
+static const struct snd_kcontrol_new axg_spdifout_in_mux =
+ SOC_DAPM_ENUM("Input Source", axg_spdifout_sel_enum);
+
+static const struct snd_soc_dapm_widget axg_spdifout_dapm_widgets[] = {
+ SND_SOC_DAPM_AIF_IN("IN 0", NULL, 0, SND_SOC_NOPM, 0, 0),
+ SND_SOC_DAPM_AIF_IN("IN 1", NULL, 0, SND_SOC_NOPM, 0, 0),
+ SND_SOC_DAPM_AIF_IN("IN 2", NULL, 0, SND_SOC_NOPM, 0, 0),
+ SND_SOC_DAPM_MUX("SRC SEL", SND_SOC_NOPM, 0, 0, &axg_spdifout_in_mux),
+};
+
+static const struct snd_soc_dapm_route axg_spdifout_dapm_routes[] = {
+ { "SRC SEL", "IN 0", "IN 0" },
+ { "SRC SEL", "IN 1", "IN 1" },
+ { "SRC SEL", "IN 2", "IN 2" },
+ { "Playback", NULL, "SRC SEL" },
+};
+
+static const struct snd_kcontrol_new axg_spdifout_controls[] = {
+ SOC_DOUBLE("Playback Volume", SPDIFOUT_GAIN0, 0, 8, 255, 0),
+ SOC_DOUBLE("Playback Switch", SPDIFOUT_CTRL0, 22, 21, 1, 1),
+ SOC_SINGLE("Playback Gain Enable Switch",
+ SPDIFOUT_CTRL1, 26, 1, 0),
+ SOC_SINGLE("Playback Channels Mix Switch",
+ SPDIFOUT_CTRL0, 23, 1, 0),
+};
+
+static int axg_spdifout_set_bias_level(struct snd_soc_component *component,
+ enum snd_soc_bias_level level)
+{
+ struct axg_spdifout *priv = snd_soc_component_get_drvdata(component);
+ enum snd_soc_bias_level now =
+ snd_soc_component_get_bias_level(component);
+ int ret = 0;
+
+ switch (level) {
+ case SND_SOC_BIAS_PREPARE:
+ if (now == SND_SOC_BIAS_STANDBY)
+ ret = clk_prepare_enable(priv->mclk);
+ break;
+
+ case SND_SOC_BIAS_STANDBY:
+ if (now == SND_SOC_BIAS_PREPARE)
+ clk_disable_unprepare(priv->mclk);
+ break;
+
+ case SND_SOC_BIAS_OFF:
+ case SND_SOC_BIAS_ON:
+ break;
+ }
+
+ return ret;
+}
+
+static const struct snd_soc_component_driver axg_spdifout_component_drv = {
+ .controls = axg_spdifout_controls,
+ .num_controls = ARRAY_SIZE(axg_spdifout_controls),
+ .dapm_widgets = axg_spdifout_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(axg_spdifout_dapm_widgets),
+ .dapm_routes = axg_spdifout_dapm_routes,
+ .num_dapm_routes = ARRAY_SIZE(axg_spdifout_dapm_routes),
+ .set_bias_level = axg_spdifout_set_bias_level,
+};
+
+static const struct regmap_config axg_spdifout_regmap_cfg = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = 4,
+ .max_register = SPDIFOUT_MUTE_VAL,
+};
+
+static const struct of_device_id axg_spdifout_of_match[] = {
+ { .compatible = "amlogic,axg-spdifout", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, axg_spdifout_of_match);
+
+static int axg_spdifout_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct axg_spdifout *priv;
+ struct resource *res;
+ void __iomem *regs;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, priv);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ regs = devm_ioremap_resource(dev, res);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+
+ priv->map = devm_regmap_init_mmio(dev, regs, &axg_spdifout_regmap_cfg);
+ if (IS_ERR(priv->map)) {
+ dev_err(dev, "failed to init regmap: %ld\n",
+ PTR_ERR(priv->map));
+ return PTR_ERR(priv->map);
+ }
+
+ priv->pclk = devm_clk_get(dev, "pclk");
+ if (IS_ERR(priv->pclk)) {
+ ret = PTR_ERR(priv->pclk);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "failed to get pclk: %d\n", ret);
+ return ret;
+ }
+
+ priv->mclk = devm_clk_get(dev, "mclk");
+ if (IS_ERR(priv->mclk)) {
+ ret = PTR_ERR(priv->mclk);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "failed to get mclk: %d\n", ret);
+ return ret;
+ }
+
+ return devm_snd_soc_register_component(dev, &axg_spdifout_component_drv,
+ axg_spdifout_dai_drv, ARRAY_SIZE(axg_spdifout_dai_drv));
+}
+
+static struct platform_driver axg_spdifout_pdrv = {
+ .probe = axg_spdifout_probe,
+ .driver = {
+ .name = "axg-spdifout",
+ .of_match_table = axg_spdifout_of_match,
+ },
+};
+module_platform_driver(axg_spdifout_pdrv);
+
+MODULE_DESCRIPTION("Amlogic AXG SPDIF Output driver");
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
+MODULE_LICENSE("GPL v2");
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