From: "Damien.Horsley" Damien.Horsley@imgtec.com

Add binding document for Pistachio Internal DAC

Signed-off-by: Damien.Horsley Damien.Horsley@imgtec.com --- .../bindings/sound/img,pistachio-internal-dac.txt | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 Documentation/devicetree/bindings/sound/img,pistachio-internal-dac.txt

diff --git a/Documentation/devicetree/bindings/sound/img,pistachio-internal-dac.txt b/Documentation/devicetree/bindings/sound/img,pistachio-internal-dac.txt new file mode 100644 index 0000000..4cc18fc --- /dev/null +++ b/Documentation/devicetree/bindings/sound/img,pistachio-internal-dac.txt @@ -0,0 +1,18 @@ +Pistachio internal DAC DT bindings + +Required properties: + + - compatible: "img,pistachio-internal-dac" + + - img,cr-top : Must contain a phandle to the top level control syscon + node which contains the internal dac control registers + + - VDD-supply : Digital power supply regulator (+1.8V or +3.3V) + +Examples: + +internal_dac: internal-dac { + compatible = "img,pistachio-internal-dac"; + img,cr-top = <&cr_top>; + VDD-supply = <&supply3v3>; +};

From: "Damien.Horsley" Damien.Horsley@imgtec.com

Add driver for Pistachio Internal DAC

Signed-off-by: Damien.Horsley Damien.Horsley@imgtec.com --- sound/soc/img/Kconfig | 8 + sound/soc/img/Makefile | 2 + sound/soc/img/pistachio-internal-dac.c | 350 +++++++++++++++++++++++++++++++++ 3 files changed, 360 insertions(+) create mode 100644 sound/soc/img/pistachio-internal-dac.c

diff --git a/sound/soc/img/Kconfig b/sound/soc/img/Kconfig index d08537e..857a951 100644 --- 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 --- 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 index 0000000..d7df2f3 --- /dev/null +++ b/sound/soc/img/pistachio-internal-dac.c @@ -0,0 +1,350 @@ +/* + * 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_MUTE_MASK 0x4 +#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 { + spinlock_t lock; + struct regmap *regmap; + struct regulator *supply; + + /* The mute state as set by alsa using the digital_mute callback */ + bool alsa_mute_state; + /* The mute state as set by the userspace mute control */ + bool control_mute_state; + /* The actual mute state is equal to an OR of the above */ +}; + +static int pistachio_internal_dac_get_mute(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol); + struct pistachio_internal_dac *dac = snd_soc_codec_get_drvdata(codec); + + ucontrol->value.integer.value[0] = dac->control_mute_state; + + return 0; +} + +static void pistachio_internal_dac_mute(struct pistachio_internal_dac *dac) +{ + u32 reg; + + if (dac->control_mute_state || dac->alsa_mute_state) + reg = PISTACHIO_INTERNAL_DAC_CTRL_MUTE_MASK; + else + reg = 0; + + regmap_update_bits(dac->regmap, PISTACHIO_INTERNAL_DAC_CTRL, + PISTACHIO_INTERNAL_DAC_CTRL_MUTE_MASK, reg); +} + +static int pistachio_internal_dac_set_mute(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol); + struct pistachio_internal_dac *dac = snd_soc_codec_get_drvdata(codec); + unsigned long flags; + + spin_lock_irqsave(&dac->lock, flags); + dac->control_mute_state = ucontrol->value.integer.value[0]; + pistachio_internal_dac_mute(dac); + spin_unlock_irqrestore(&dac->lock, flags); + + return 0; +} + +static const struct snd_kcontrol_new pistachio_internal_dac_snd_controls[] = { + { + .access = SNDRV_CTL_ELEM_ACCESS_READWRITE, + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = "Mute Switch", + .info = snd_ctl_boolean_mono_info, + .get = pistachio_internal_dac_get_mute, + .put = pistachio_internal_dac_set_mute, + } +}; + +static int pistachio_internal_dac_digital_mute(struct snd_soc_dai *dai, + int mute) +{ + struct snd_soc_codec *codec = dai->codec; + struct pistachio_internal_dac *dac = snd_soc_codec_get_drvdata(codec); + unsigned long flags; + + spin_lock_irqsave(&dac->lock, flags); + dac->alsa_mute_state = mute; + pistachio_internal_dac_mute(dac); + spin_unlock_irqrestore(&dac->lock, flags); + + return 0; +} + +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 const struct snd_soc_dai_ops pistachio_internal_dac_dac_dai_ops = { + .digital_mute = pistachio_internal_dac_digital_mute, +}; + +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, + }, + .ops = &pistachio_internal_dac_dac_dai_ops, + }, +}; + +static const struct snd_soc_codec_driver pistachio_internal_dac_driver = { + .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; + + spin_lock_init(&dac->lock); + + 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)) { + if (PTR_ERR(dac->supply) != -EPROBE_DEFER) + dev_err(dev, "failed to acquire supply 'VDD-supply'\n"); + return PTR_ERR(dac->supply); + } + + 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); + + 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; + } + + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + pm_runtime_idle(dev); + + return 0; + +err_pwr: + 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");