ASoC: img: Add driver for Pistachio internal DAC

Add driver for Pistachio Internal DAC

Signed-off-by: Damien.Horsley <Damien.Horsley@imgtec.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/img/Kconfig b/sound/soc/img/Kconfig
index d08537e..857a951 100644 (file)
--- a/sound/soc/img/Kconfig
+++ b/sound/soc/img/Kconfig
@@ -42,3 +42,11 @@ config SND_SOC_IMG_SPDIF_OUT
        help
          Say Y or M if you want to add support for SPDIF out driver for
          Imagination Technologies SPDIF out device.
+
+
+config SND_SOC_IMG_PISTACHIO_INTERNAL_DAC
+       tristate "Support for Pistachio SoC Internal DAC Driver"
+       depends on SND_SOC_IMG
+       help
+         Say Y or M if you want to add support for Pistachio internal DAC
+         driver for Imagination Technologies Pistachio internal DAC device.

diff --git a/sound/soc/img/Makefile b/sound/soc/img/Makefile
index 1a44fb4..0508c1c 100644 (file)
--- a/sound/soc/img/Makefile
+++ b/sound/soc/img/Makefile
@@ -3,3 +3,5 @@ obj-$(CONFIG_SND_SOC_IMG_I2S_OUT) += img-i2s-out.o
 obj-$(CONFIG_SND_SOC_IMG_PARALLEL_OUT) += img-parallel-out.o
 obj-$(CONFIG_SND_SOC_IMG_SPDIF_IN) += img-spdif-in.o
 obj-$(CONFIG_SND_SOC_IMG_SPDIF_OUT) += img-spdif-out.o
+
+obj-$(CONFIG_SND_SOC_IMG_PISTACHIO_INTERNAL_DAC) += pistachio-internal-dac.o

diff --git a/sound/soc/img/pistachio-internal-dac.c b/sound/soc/img/pistachio-internal-dac.c
new file mode 100644 (file)
index 0000000..162a0fd
--- /dev/null
+++ b/sound/soc/img/pistachio-internal-dac.c
@@ -0,0 +1,287 @@
+/*
+ * Pistachio internal dac driver
+ *
+ * Copyright (C) 2015 Imagination Technologies Ltd.
+ *
+ * Author: Damien Horsley <Damien.Horsley@imgtec.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#define PISTACHIO_INTERNAL_DAC_CTRL                    0x40
+#define PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK       0x2
+#define PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK         0x1
+
+#define PISTACHIO_INTERNAL_DAC_SRST                    0x44
+#define PISTACHIO_INTERNAL_DAC_SRST_MASK               0x1
+
+#define PISTACHIO_INTERNAL_DAC_GTI_CTRL                        0x48
+#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_SHIFT     0
+#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_MASK      0xFFF
+#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK                0x1000
+#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_SHIFT    13
+#define PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_MASK     0x1FE000
+
+#define PISTACHIO_INTERNAL_DAC_PWR                     0x1
+#define PISTACHIO_INTERNAL_DAC_PWR_MASK                        0x1
+
+#define PISTACHIO_INTERNAL_DAC_FORMATS (SNDRV_PCM_FMTBIT_S24_LE |  \
+                                       SNDRV_PCM_FMTBIT_S32_LE)
+
+/* codec private data */
+struct pistachio_internal_dac {
+       struct regmap *regmap;
+       struct regulator *supply;
+       bool mute;
+};
+
+static const struct snd_kcontrol_new pistachio_internal_dac_snd_controls[] = {
+       SOC_SINGLE("Playback Switch", PISTACHIO_INTERNAL_DAC_CTRL, 2, 1, 1)
+};
+
+static const struct snd_soc_dapm_widget pistachio_internal_dac_widgets[] = {
+       SND_SOC_DAPM_DAC("DAC", "Playback", SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_OUTPUT("AOUTL"),
+       SND_SOC_DAPM_OUTPUT("AOUTR"),
+};
+
+static const struct snd_soc_dapm_route pistachio_internal_dac_routes[] = {
+       { "AOUTL", NULL, "DAC" },
+       { "AOUTR", NULL, "DAC" },
+};
+
+static void pistachio_internal_dac_reg_writel(struct regmap *top_regs,
+                                               u32 val, u32 reg)
+{
+       regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
+                       PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_MASK,
+                       reg << PISTACHIO_INTERNAL_DAC_GTI_CTRL_ADDR_SHIFT);
+
+       regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
+                       PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_MASK,
+                       val << PISTACHIO_INTERNAL_DAC_GTI_CTRL_WDATA_SHIFT);
+
+       regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
+                       PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK,
+                       PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK);
+
+       regmap_update_bits(top_regs, PISTACHIO_INTERNAL_DAC_GTI_CTRL,
+                       PISTACHIO_INTERNAL_DAC_GTI_CTRL_WE_MASK, 0);
+}
+
+static void pistachio_internal_dac_pwr_off(struct pistachio_internal_dac *dac)
+{
+       regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL,
+               PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK,
+               PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK);
+
+       pistachio_internal_dac_reg_writel(dac->regmap, 0,
+                                       PISTACHIO_INTERNAL_DAC_PWR);
+}
+
+static void pistachio_internal_dac_pwr_on(struct pistachio_internal_dac *dac)
+{
+       regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_SRST,
+                       PISTACHIO_INTERNAL_DAC_SRST_MASK,
+                       PISTACHIO_INTERNAL_DAC_SRST_MASK);
+
+       regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_SRST,
+                       PISTACHIO_INTERNAL_DAC_SRST_MASK, 0);
+
+       pistachio_internal_dac_reg_writel(dac->regmap,
+                                       PISTACHIO_INTERNAL_DAC_PWR_MASK,
+                                       PISTACHIO_INTERNAL_DAC_PWR);
+
+       regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL,
+                       PISTACHIO_INTERNAL_DAC_CTRL_PWRDN_MASK, 0);
+}
+
+static struct snd_soc_dai_driver pistachio_internal_dac_dais[] = {
+       {
+               .name = "pistachio_internal_dac",
+               .playback = {
+                       .stream_name = "Playback",
+                       .channels_min = 2,
+                       .channels_max = 2,
+                       .rates = SNDRV_PCM_RATE_8000_48000,
+                       .formats = PISTACHIO_INTERNAL_DAC_FORMATS,
+               }
+       },
+};
+
+static int pistachio_internal_dac_codec_probe(struct snd_soc_codec *codec)
+{
+       struct pistachio_internal_dac *dac = snd_soc_codec_get_drvdata(codec);
+
+       snd_soc_codec_init_regmap(codec, dac->regmap);
+
+       return 0;
+}
+
+static const struct snd_soc_codec_driver pistachio_internal_dac_driver = {
+       .probe = pistachio_internal_dac_codec_probe,
+       .idle_bias_off = true,
+       .controls = pistachio_internal_dac_snd_controls,
+       .num_controls = ARRAY_SIZE(pistachio_internal_dac_snd_controls),
+       .dapm_widgets = pistachio_internal_dac_widgets,
+       .num_dapm_widgets = ARRAY_SIZE(pistachio_internal_dac_widgets),
+       .dapm_routes = pistachio_internal_dac_routes,
+       .num_dapm_routes = ARRAY_SIZE(pistachio_internal_dac_routes),
+};
+
+static int pistachio_internal_dac_probe(struct platform_device *pdev)
+{
+       struct pistachio_internal_dac *dac;
+       int ret, voltage;
+       struct device *dev = &pdev->dev;
+       u32 reg;
+
+       dac = devm_kzalloc(dev, sizeof(*dac), GFP_KERNEL);
+
+       if (!dac)
+               return -ENOMEM;
+
+       platform_set_drvdata(pdev, dac);
+
+       dac->regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+                                                           "img,cr-top");
+       if (IS_ERR(dac->regmap))
+               return PTR_ERR(dac->regmap);
+
+       dac->supply = devm_regulator_get(dev, "VDD");
+       if (IS_ERR(dac->supply)) {
+               ret = PTR_ERR(dac->supply);
+               if (ret != -EPROBE_DEFER)
+                       dev_err(dev, "failed to acquire supply 'VDD-supply': %d\n", ret);
+               return ret;
+       }
+
+       ret = regulator_enable(dac->supply);
+       if (ret) {
+               dev_err(dev, "failed to enable supply: %d\n", ret);
+               return ret;
+       }
+
+       voltage = regulator_get_voltage(dac->supply);
+
+       switch (voltage) {
+       case 1800000:
+               reg = 0;
+               break;
+       case 3300000:
+               reg = PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK;
+               break;
+       default:
+               dev_err(dev, "invalid voltage: %d\n", voltage);
+               ret = -EINVAL;
+               goto err_regulator;
+       }
+
+       regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL,
+                       PISTACHIO_INTERNAL_DAC_CTRL_PWR_SEL_MASK, reg);
+
+       pistachio_internal_dac_pwr_off(dac);
+       pistachio_internal_dac_pwr_on(dac);
+
+       pm_runtime_set_active(dev);
+       pm_runtime_enable(dev);
+       pm_runtime_idle(dev);
+
+       ret = snd_soc_register_codec(dev, &pistachio_internal_dac_driver,
+                       pistachio_internal_dac_dais,
+                       ARRAY_SIZE(pistachio_internal_dac_dais));
+       if (ret) {
+               dev_err(dev, "failed to register codec: %d\n", ret);
+               goto err_pwr;
+       }
+
+       return 0;
+
+err_pwr:
+       pm_runtime_disable(&pdev->dev);
+       pistachio_internal_dac_pwr_off(dac);
+err_regulator:
+       regulator_disable(dac->supply);
+
+       return ret;
+}
+
+static int pistachio_internal_dac_remove(struct platform_device *pdev)
+{
+       struct pistachio_internal_dac *dac = dev_get_drvdata(&pdev->dev);
+
+       snd_soc_unregister_codec(&pdev->dev);
+       pm_runtime_disable(&pdev->dev);
+       pistachio_internal_dac_pwr_off(dac);
+       regulator_disable(dac->supply);
+
+       return 0;
+}
+
+#ifdef CONFIG_PM
+static int pistachio_internal_dac_rt_resume(struct device *dev)
+{
+       struct pistachio_internal_dac *dac = dev_get_drvdata(dev);
+       int ret;
+
+       ret = regulator_enable(dac->supply);
+       if (ret) {
+               dev_err(dev, "failed to enable supply: %d\n", ret);
+               return ret;
+       }
+
+       pistachio_internal_dac_pwr_on(dac);
+
+       return 0;
+}
+
+static int pistachio_internal_dac_rt_suspend(struct device *dev)
+{
+       struct pistachio_internal_dac *dac = dev_get_drvdata(dev);
+
+       pistachio_internal_dac_pwr_off(dac);
+
+       regulator_disable(dac->supply);
+
+       return 0;
+}
+#endif
+
+static const struct dev_pm_ops pistachio_internal_dac_pm_ops = {
+       SET_RUNTIME_PM_OPS(pistachio_internal_dac_rt_suspend,
+                       pistachio_internal_dac_rt_resume, NULL)
+};
+
+static const struct of_device_id pistachio_internal_dac_of_match[] = {
+       { .compatible = "img,pistachio-internal-dac" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, pistachio_internal_dac_of_match);
+
+static struct platform_driver pistachio_internal_dac_plat_driver = {
+       .driver = {
+               .name = "img-pistachio-internal-dac",
+               .of_match_table = pistachio_internal_dac_of_match,
+               .pm = &pistachio_internal_dac_pm_ops
+       },
+       .probe = pistachio_internal_dac_probe,
+       .remove = pistachio_internal_dac_remove
+};
+module_platform_driver(pistachio_internal_dac_plat_driver);
+
+MODULE_DESCRIPTION("Pistachio Internal DAC driver");
+MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
+MODULE_LICENSE("GPL v2");