--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// tegra186_dspk.c - Tegra186 DSPK driver
+//
+// Copyright (c) 2020 NVIDIA CORPORATION. All rights reserved.
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <sound/core.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include "tegra186_dspk.h"
+#include "tegra_cif.h"
+
+static const struct reg_default tegra186_dspk_reg_defaults[] = {
+ { TEGRA186_DSPK_RX_INT_MASK, 0x00000007 },
+ { TEGRA186_DSPK_RX_CIF_CTRL, 0x00007700 },
+ { TEGRA186_DSPK_CG, 0x00000001 },
+ { TEGRA186_DSPK_CORE_CTRL, 0x00000310 },
+ { TEGRA186_DSPK_CODEC_CTRL, 0x03000000 },
+};
+
+static int tegra186_dspk_get_control(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_component *codec = snd_soc_kcontrol_component(kcontrol);
+ struct tegra186_dspk *dspk = snd_soc_component_get_drvdata(codec);
+
+ if (strstr(kcontrol->id.name, "FIFO Threshold"))
+ ucontrol->value.integer.value[0] = dspk->rx_fifo_th;
+ else if (strstr(kcontrol->id.name, "OSR Value"))
+ ucontrol->value.integer.value[0] = dspk->osr_val;
+ else if (strstr(kcontrol->id.name, "LR Polarity Select"))
+ ucontrol->value.integer.value[0] = dspk->lrsel;
+ else if (strstr(kcontrol->id.name, "Channel Select"))
+ ucontrol->value.integer.value[0] = dspk->ch_sel;
+ else if (strstr(kcontrol->id.name, "Mono To Stereo"))
+ ucontrol->value.integer.value[0] = dspk->mono_to_stereo;
+ else if (strstr(kcontrol->id.name, "Stereo To Mono"))
+ ucontrol->value.integer.value[0] = dspk->stereo_to_mono;
+
+ return 0;
+}
+
+static int tegra186_dspk_put_control(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_component *codec = snd_soc_kcontrol_component(kcontrol);
+ struct tegra186_dspk *dspk = snd_soc_component_get_drvdata(codec);
+ int val = ucontrol->value.integer.value[0];
+
+ if (strstr(kcontrol->id.name, "FIFO Threshold"))
+ dspk->rx_fifo_th = val;
+ else if (strstr(kcontrol->id.name, "OSR Value"))
+ dspk->osr_val = val;
+ else if (strstr(kcontrol->id.name, "LR Polarity Select"))
+ dspk->lrsel = val;
+ else if (strstr(kcontrol->id.name, "Channel Select"))
+ dspk->ch_sel = val;
+ else if (strstr(kcontrol->id.name, "Mono To Stereo"))
+ dspk->mono_to_stereo = val;
+ else if (strstr(kcontrol->id.name, "Stereo To Mono"))
+ dspk->stereo_to_mono = val;
+
+ return 0;
+}
+
+static int tegra186_dspk_runtime_suspend(struct device *dev)
+{
+ struct tegra186_dspk *dspk = dev_get_drvdata(dev);
+
+ regcache_cache_only(dspk->regmap, true);
+ regcache_mark_dirty(dspk->regmap);
+
+ clk_disable_unprepare(dspk->clk_dspk);
+
+ return 0;
+}
+
+static int tegra186_dspk_runtime_resume(struct device *dev)
+{
+ struct tegra186_dspk *dspk = dev_get_drvdata(dev);
+ int err;
+
+ err = clk_prepare_enable(dspk->clk_dspk);
+ if (err) {
+ dev_err(dev, "failed to enable DSPK clock, err: %d\n", err);
+ return err;
+ }
+
+ regcache_cache_only(dspk->regmap, false);
+ regcache_sync(dspk->regmap);
+
+ return 0;
+}
+
+static int tegra186_dspk_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct tegra186_dspk *dspk = snd_soc_dai_get_drvdata(dai);
+ unsigned int channels, srate, dspk_clk;
+ struct device *dev = dai->dev;
+ struct tegra_cif_conf cif_conf;
+ unsigned int max_th;
+ int err;
+
+ memset(&cif_conf, 0, sizeof(struct tegra_cif_conf));
+
+ channels = params_channels(params);
+ cif_conf.audio_ch = channels;
+
+ /* Client channel */
+ switch (dspk->ch_sel) {
+ case DSPK_CH_SELECT_LEFT:
+ case DSPK_CH_SELECT_RIGHT:
+ cif_conf.client_ch = 1;
+ break;
+ case DSPK_CH_SELECT_STEREO:
+ cif_conf.client_ch = 2;
+ break;
+ default:
+ dev_err(dev, "Invalid DSPK client channels\n");
+ return -EINVAL;
+ }
+
+ cif_conf.client_bits = TEGRA_ACIF_BITS_24;
+
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ cif_conf.audio_bits = TEGRA_ACIF_BITS_16;
+ break;
+ case SNDRV_PCM_FORMAT_S32_LE:
+ cif_conf.audio_bits = TEGRA_ACIF_BITS_32;
+ break;
+ default:
+ dev_err(dev, "unsupported format!\n");
+ return -EOPNOTSUPP;
+ }
+
+ srate = params_rate(params);
+
+ /* RX FIFO threshold in terms of frames */
+ max_th = (TEGRA186_DSPK_RX_FIFO_DEPTH / cif_conf.audio_ch) - 1;
+
+ if (dspk->rx_fifo_th > max_th)
+ dspk->rx_fifo_th = max_th;
+
+ cif_conf.threshold = dspk->rx_fifo_th;
+ cif_conf.mono_conv = dspk->mono_to_stereo;
+ cif_conf.stereo_conv = dspk->stereo_to_mono;
+
+ tegra_set_cif(dspk->regmap, TEGRA186_DSPK_RX_CIF_CTRL,
+ &cif_conf);
+
+ /*
+ * DSPK clock and PDM codec clock should be synchronous with 4:1 ratio,
+ * this is because it takes 4 clock cycles to send out one sample to
+ * codec by sigma delta modulator. Finally the clock rate is a multiple
+ * of 'Over Sampling Ratio', 'Sample Rate' and 'Interface Clock Ratio'.
+ */
+ dspk_clk = (DSPK_OSR_FACTOR << dspk->osr_val) * srate * DSPK_CLK_RATIO;
+
+ err = clk_set_rate(dspk->clk_dspk, dspk_clk);
+ if (err) {
+ dev_err(dev, "can't set DSPK clock rate %u, err: %d\n",
+ dspk_clk, err);
+
+ return err;
+ }
+
+ regmap_update_bits(dspk->regmap,
+ /* Reg */
+ TEGRA186_DSPK_CORE_CTRL,
+ /* Mask */
+ TEGRA186_DSPK_OSR_MASK |
+ TEGRA186_DSPK_CHANNEL_SELECT_MASK |
+ TEGRA186_DSPK_CTRL_LRSEL_POLARITY_MASK,
+ /* Value */
+ (dspk->osr_val << DSPK_OSR_SHIFT) |
+ ((dspk->ch_sel + 1) << CH_SEL_SHIFT) |
+ (dspk->lrsel << LRSEL_POL_SHIFT));
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops tegra186_dspk_dai_ops = {
+ .hw_params = tegra186_dspk_hw_params,
+};
+
+static struct snd_soc_dai_driver tegra186_dspk_dais[] = {
+ {
+ .name = "DSPK-CIF",
+ .playback = {
+ .stream_name = "CIF-Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ },
+ {
+ .name = "DSPK-DAP",
+ .playback = {
+ .stream_name = "DAP-Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_48000,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ .ops = &tegra186_dspk_dai_ops,
+ .symmetric_rates = 1,
+ },
+};
+
+static const struct snd_soc_dapm_widget tegra186_dspk_widgets[] = {
+ SND_SOC_DAPM_AIF_IN("RX", NULL, 0, TEGRA186_DSPK_ENABLE, 0, 0),
+ SND_SOC_DAPM_SPK("SPK", NULL),
+};
+
+static const struct snd_soc_dapm_route tegra186_dspk_routes[] = {
+ { "XBAR-Playback", NULL, "XBAR-TX" },
+ { "CIF-Playback", NULL, "XBAR-Playback" },
+ { "RX", NULL, "CIF-Playback" },
+ { "DAP-Playback", NULL, "RX" },
+ { "SPK", NULL, "DAP-Playback" },
+};
+
+static const char * const tegra186_dspk_ch_sel_text[] = {
+ "Left", "Right", "Stereo",
+};
+
+static const struct soc_enum tegra186_dspk_ch_sel_enum =
+ SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(tegra186_dspk_ch_sel_text),
+ tegra186_dspk_ch_sel_text);
+
+static const char * const tegra186_dspk_osr_text[] = {
+ "OSR_32", "OSR_64", "OSR_128", "OSR_256",
+};
+
+static const struct soc_enum tegra186_dspk_osr_enum =
+ SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(tegra186_dspk_osr_text),
+ tegra186_dspk_osr_text);
+
+static const char * const tegra186_dspk_lrsel_text[] = {
+ "Left", "Right",
+};
+
+static const char * const tegra186_dspk_mono_conv_text[] = {
+ "Zero", "Copy",
+};
+
+static const struct soc_enum tegra186_dspk_mono_conv_enum =
+ SOC_ENUM_SINGLE(SND_SOC_NOPM, 0,
+ ARRAY_SIZE(tegra186_dspk_mono_conv_text),
+ tegra186_dspk_mono_conv_text);
+
+static const char * const tegra186_dspk_stereo_conv_text[] = {
+ "CH0", "CH1", "AVG",
+};
+
+static const struct soc_enum tegra186_dspk_stereo_conv_enum =
+ SOC_ENUM_SINGLE(SND_SOC_NOPM, 0,
+ ARRAY_SIZE(tegra186_dspk_stereo_conv_text),
+ tegra186_dspk_stereo_conv_text);
+
+static const struct soc_enum tegra186_dspk_lrsel_enum =
+ SOC_ENUM_SINGLE(SND_SOC_NOPM, 0, ARRAY_SIZE(tegra186_dspk_lrsel_text),
+ tegra186_dspk_lrsel_text);
+
+static const struct snd_kcontrol_new tegrat186_dspk_controls[] = {
+ SOC_SINGLE_EXT("FIFO Threshold", SND_SOC_NOPM, 0,
+ TEGRA186_DSPK_RX_FIFO_DEPTH - 1, 0,
+ tegra186_dspk_get_control, tegra186_dspk_put_control),
+ SOC_ENUM_EXT("OSR Value", tegra186_dspk_osr_enum,
+ tegra186_dspk_get_control, tegra186_dspk_put_control),
+ SOC_ENUM_EXT("LR Polarity Select", tegra186_dspk_lrsel_enum,
+ tegra186_dspk_get_control, tegra186_dspk_put_control),
+ SOC_ENUM_EXT("Channel Select", tegra186_dspk_ch_sel_enum,
+ tegra186_dspk_get_control, tegra186_dspk_put_control),
+ SOC_ENUM_EXT("Mono To Stereo", tegra186_dspk_mono_conv_enum,
+ tegra186_dspk_get_control, tegra186_dspk_put_control),
+ SOC_ENUM_EXT("Stereo To Mono", tegra186_dspk_stereo_conv_enum,
+ tegra186_dspk_get_control, tegra186_dspk_put_control),
+};
+
+static const struct snd_soc_component_driver tegra186_dspk_cmpnt = {
+ .dapm_widgets = tegra186_dspk_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(tegra186_dspk_widgets),
+ .dapm_routes = tegra186_dspk_routes,
+ .num_dapm_routes = ARRAY_SIZE(tegra186_dspk_routes),
+ .controls = tegrat186_dspk_controls,
+ .num_controls = ARRAY_SIZE(tegrat186_dspk_controls),
+};
+
+static bool tegra186_dspk_wr_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TEGRA186_DSPK_RX_INT_MASK ... TEGRA186_DSPK_RX_CIF_CTRL:
+ case TEGRA186_DSPK_ENABLE ... TEGRA186_DSPK_CG:
+ case TEGRA186_DSPK_CORE_CTRL ... TEGRA186_DSPK_CODEC_CTRL:
+ return true;
+ default:
+ return false;
+ };
+}
+
+static bool tegra186_dspk_rd_reg(struct device *dev, unsigned int reg)
+{
+ if (tegra186_dspk_wr_reg(dev, reg))
+ return true;
+
+ switch (reg) {
+ case TEGRA186_DSPK_RX_STATUS:
+ case TEGRA186_DSPK_RX_INT_STATUS:
+ case TEGRA186_DSPK_STATUS:
+ case TEGRA186_DSPK_INT_STATUS:
+ return true;
+ default:
+ return false;
+ };
+}
+
+static bool tegra186_dspk_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case TEGRA186_DSPK_RX_STATUS:
+ case TEGRA186_DSPK_RX_INT_STATUS:
+ case TEGRA186_DSPK_STATUS:
+ case TEGRA186_DSPK_INT_STATUS:
+ return true;
+ default:
+ return false;
+ };
+}
+
+static const struct regmap_config tegra186_dspk_regmap = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = TEGRA186_DSPK_CODEC_CTRL,
+ .writeable_reg = tegra186_dspk_wr_reg,
+ .readable_reg = tegra186_dspk_rd_reg,
+ .volatile_reg = tegra186_dspk_volatile_reg,
+ .reg_defaults = tegra186_dspk_reg_defaults,
+ .num_reg_defaults = ARRAY_SIZE(tegra186_dspk_reg_defaults),
+ .cache_type = REGCACHE_FLAT,
+};
+
+static const struct of_device_id tegra186_dspk_of_match[] = {
+ { .compatible = "nvidia,tegra186-dspk" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, tegra186_dspk_of_match);
+
+static int tegra186_dspk_platform_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct tegra186_dspk *dspk;
+ void __iomem *regs;
+ int err;
+
+ dspk = devm_kzalloc(dev, sizeof(*dspk), GFP_KERNEL);
+ if (!dspk)
+ return -ENOMEM;
+
+ dspk->osr_val = DSPK_OSR_64;
+ dspk->lrsel = DSPK_LRSEL_LEFT;
+ dspk->ch_sel = DSPK_CH_SELECT_STEREO;
+ dspk->mono_to_stereo = 0; /* "Zero" */
+
+ dev_set_drvdata(dev, dspk);
+
+ dspk->clk_dspk = devm_clk_get(dev, "dspk");
+ if (IS_ERR(dspk->clk_dspk)) {
+ dev_err(dev, "can't retrieve DSPK clock\n");
+ return PTR_ERR(dspk->clk_dspk);
+ }
+
+ regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+
+ dspk->regmap = devm_regmap_init_mmio(dev, regs, &tegra186_dspk_regmap);
+ if (IS_ERR(dspk->regmap)) {
+ dev_err(dev, "regmap init failed\n");
+ return PTR_ERR(dspk->regmap);
+ }
+
+ regcache_cache_only(dspk->regmap, true);
+
+ err = devm_snd_soc_register_component(dev, &tegra186_dspk_cmpnt,
+ tegra186_dspk_dais,
+ ARRAY_SIZE(tegra186_dspk_dais));
+ if (err) {
+ dev_err(dev, "can't register DSPK component, err: %d\n",
+ err);
+ return err;
+ }
+
+ pm_runtime_enable(dev);
+
+ return 0;
+}
+
+static int tegra186_dspk_platform_remove(struct platform_device *pdev)
+{
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+static const struct dev_pm_ops tegra186_dspk_pm_ops = {
+ SET_RUNTIME_PM_OPS(tegra186_dspk_runtime_suspend,
+ tegra186_dspk_runtime_resume, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+};
+
+static struct platform_driver tegra186_dspk_driver = {
+ .driver = {
+ .name = "tegra186-dspk",
+ .of_match_table = tegra186_dspk_of_match,
+ .pm = &tegra186_dspk_pm_ops,
+ },
+ .probe = tegra186_dspk_platform_probe,
+ .remove = tegra186_dspk_platform_remove,
+};
+module_platform_driver(tegra186_dspk_driver);
+
+MODULE_AUTHOR("Mohan Kumar <mkumard@nvidia.com>");
+MODULE_AUTHOR("Sameer Pujar <spujar@nvidia.com>");
+MODULE_DESCRIPTION("Tegra186 ASoC DSPK driver");
+MODULE_LICENSE("GPL v2");
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