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/*
* 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");
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