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