Commit 39582322 authored by Damien.Horsley's avatar Damien.Horsley Committed by Mark Brown
Browse files

ASoC: img: Add driver for SPDIF output controller 



Add driver for Imagination Technologies SPDIF output
controller

Signed-off-by: default avatarDamien.Horsley <Damien.Horsley@imgtec.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 0f4ab87a

sound/soc/img/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -34,3 +34,11 @@ config SND_SOC_IMG_SPDIF_IN 
	help

	  Say Y or M if you want to add support for SPDIF input driver for

	  Imagination Technologies SPDIF input device.



config SND_SOC_IMG_SPDIF_OUT

	tristate "Imagination SPDIF Output Device Driver"

	depends on SND_SOC_IMG

	select SND_SOC_GENERIC_DMAENGINE_PCM

	help

	  Say Y or M if you want to add support for SPDIF out driver for

	  Imagination Technologies SPDIF out device.

sound/soc/img/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -2,3 +2,4 @@ obj-$(CONFIG_SND_SOC_IMG_I2S_IN) += img-i2s-in.o 
obj-$(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

sound/soc/img/img-spdif-out.c

0 → 100644
+441 −0
Original line number Diff line number Diff line 
/*

 * IMG SPDIF output controller 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/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/reset.h>



#include <sound/core.h>

#include <sound/dmaengine_pcm.h>

#include <sound/initval.h>

#include <sound/pcm.h>

#include <sound/pcm_params.h>

#include <sound/soc.h>



#define IMG_SPDIF_OUT_TX_FIFO		0x0



#define IMG_SPDIF_OUT_CTL		0x4

#define IMG_SPDIF_OUT_CTL_FS_MASK	BIT(4)

#define IMG_SPDIF_OUT_CTL_CLK_MASK	BIT(2)

#define IMG_SPDIF_OUT_CTL_SRT_MASK	BIT(0)



#define IMG_SPDIF_OUT_CSL		0x14



#define IMG_SPDIF_OUT_CSH_UV		0x18

#define IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT	0

#define IMG_SPDIF_OUT_CSH_UV_CSH_MASK	0xff



struct img_spdif_out {

	spinlock_t lock;

	void __iomem *base;

	struct clk *clk_sys;

	struct clk *clk_ref;

	struct snd_dmaengine_dai_dma_data dma_data;

	struct device *dev;

	struct reset_control *rst;

};



static int img_spdif_out_suspend(struct device *dev)

{

	struct img_spdif_out *spdif = dev_get_drvdata(dev);



	clk_disable_unprepare(spdif->clk_ref);



	return 0;

}



static int img_spdif_out_resume(struct device *dev)

{

	struct img_spdif_out *spdif = dev_get_drvdata(dev);

	int ret;



	ret = clk_prepare_enable(spdif->clk_ref);

	if (ret) {

		dev_err(dev, "clk_enable failed: %d\n", ret);

		return ret;

	}



	return 0;

}



static inline void img_spdif_out_writel(struct img_spdif_out *spdif, u32 val,

				u32 reg)

{

	writel(val, spdif->base + reg);

}



static inline u32 img_spdif_out_readl(struct img_spdif_out *spdif, u32 reg)

{

	return readl(spdif->base + reg);

}



static void img_spdif_out_reset(struct img_spdif_out *spdif)

{

	u32 ctl, status_low, status_high;



	ctl = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL) &

			~IMG_SPDIF_OUT_CTL_SRT_MASK;

	status_low = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);

	status_high = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);



	reset_control_assert(spdif->rst);

	reset_control_deassert(spdif->rst);



	img_spdif_out_writel(spdif, ctl, IMG_SPDIF_OUT_CTL);

	img_spdif_out_writel(spdif, status_low, IMG_SPDIF_OUT_CSL);

	img_spdif_out_writel(spdif, status_high, IMG_SPDIF_OUT_CSH_UV);

}



static int img_spdif_out_info(struct snd_kcontrol *kcontrol,

					struct snd_ctl_elem_info *uinfo)

{

	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;

	uinfo->count = 1;



	return 0;

}



static int img_spdif_out_get_status_mask(struct snd_kcontrol *kcontrol,

				       struct snd_ctl_elem_value *ucontrol)

{

	ucontrol->value.iec958.status[0] = 0xff;

	ucontrol->value.iec958.status[1] = 0xff;

	ucontrol->value.iec958.status[2] = 0xff;

	ucontrol->value.iec958.status[3] = 0xff;

	ucontrol->value.iec958.status[4] = 0xff;



	return 0;

}



static int img_spdif_out_get_status(struct snd_kcontrol *kcontrol,

				  struct snd_ctl_elem_value *ucontrol)

{

	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);

	struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai);

	u32 reg;

	unsigned long flags;



	spin_lock_irqsave(&spdif->lock, flags);



	reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);

	ucontrol->value.iec958.status[0] = reg & 0xff;

	ucontrol->value.iec958.status[1] = (reg >> 8) & 0xff;

	ucontrol->value.iec958.status[2] = (reg >> 16) & 0xff;

	ucontrol->value.iec958.status[3] = (reg >> 24) & 0xff;



	reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);

	ucontrol->value.iec958.status[4] =

		(reg & IMG_SPDIF_OUT_CSH_UV_CSH_MASK) >>

		IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT;



	spin_unlock_irqrestore(&spdif->lock, flags);



	return 0;

}



static int img_spdif_out_set_status(struct snd_kcontrol *kcontrol,

				  struct snd_ctl_elem_value *ucontrol)

{

	struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);

	struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai);

	u32 reg;

	unsigned long flags;



	reg = ((u32)ucontrol->value.iec958.status[3] << 24);

	reg |= ((u32)ucontrol->value.iec958.status[2] << 16);

	reg |= ((u32)ucontrol->value.iec958.status[1] << 8);

	reg |= (u32)ucontrol->value.iec958.status[0];



	spin_lock_irqsave(&spdif->lock, flags);



	img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSL);



	reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);

	reg &= ~IMG_SPDIF_OUT_CSH_UV_CSH_MASK;

	reg |= (u32)ucontrol->value.iec958.status[4] <<

			IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT;

	img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSH_UV);



	spin_unlock_irqrestore(&spdif->lock, flags);



	return 0;

}



static struct snd_kcontrol_new img_spdif_out_controls[] = {

	{

		.access = SNDRV_CTL_ELEM_ACCESS_READ,

		.iface = SNDRV_CTL_ELEM_IFACE_PCM,

		.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),

		.info = img_spdif_out_info,

		.get = img_spdif_out_get_status_mask

	},

	{

		.iface = SNDRV_CTL_ELEM_IFACE_PCM,

		.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),

		.info = img_spdif_out_info,

		.get = img_spdif_out_get_status,

		.put = img_spdif_out_set_status

	}

};



static int img_spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,

			struct snd_soc_dai *dai)

{

	struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);

	u32 reg;

	unsigned long flags;



	switch (cmd) {

	case SNDRV_PCM_TRIGGER_START:

	case SNDRV_PCM_TRIGGER_RESUME:

	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

		reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);

		reg |= IMG_SPDIF_OUT_CTL_SRT_MASK;

		img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL);

		break;

	case SNDRV_PCM_TRIGGER_STOP:

	case SNDRV_PCM_TRIGGER_SUSPEND:

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

		spin_lock_irqsave(&spdif->lock, flags);

		img_spdif_out_reset(spdif);

		spin_unlock_irqrestore(&spdif->lock, flags);

		break;

	default:

		return -EINVAL;

	}



	return 0;

}



static int img_spdif_out_hw_params(struct snd_pcm_substream *substream,

	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)

{

	struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);

	unsigned int channels;

	long pre_div_a, pre_div_b, diff_a, diff_b, rate, clk_rate;

	u32 reg;

	snd_pcm_format_t format;



	rate = params_rate(params);

	format = params_format(params);

	channels = params_channels(params);



	dev_dbg(spdif->dev, "hw_params rate %ld channels %u format %u\n",

			rate, channels, format);



	if (format != SNDRV_PCM_FORMAT_S32_LE)

		return -EINVAL;



	if (channels != 2)

		return -EINVAL;



	pre_div_a = clk_round_rate(spdif->clk_ref, rate * 256);

	if (pre_div_a < 0)

		return pre_div_a;

	pre_div_b = clk_round_rate(spdif->clk_ref, rate * 384);

	if (pre_div_b < 0)

		return pre_div_b;



	diff_a = abs((pre_div_a / 256) - rate);

	diff_b = abs((pre_div_b / 384) - rate);



	/* If diffs are equal, use lower clock rate */

	if (diff_a > diff_b)

		clk_set_rate(spdif->clk_ref, pre_div_b);

	else

		clk_set_rate(spdif->clk_ref, pre_div_a);



	/*

	 * Another driver (eg machine driver) may have rejected the above

	 * change. Get the current rate and set the register bit according to

	 * the new min diff

	 */

	clk_rate = clk_get_rate(spdif->clk_ref);



	diff_a = abs((clk_rate / 256) - rate);

	diff_b = abs((clk_rate / 384) - rate);



	reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);

	if (diff_a <= diff_b)

		reg &= ~IMG_SPDIF_OUT_CTL_CLK_MASK;

	else

		reg |= IMG_SPDIF_OUT_CTL_CLK_MASK;

	img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL);



	return 0;

}



static const struct snd_soc_dai_ops img_spdif_out_dai_ops = {

	.trigger = img_spdif_out_trigger,

	.hw_params = img_spdif_out_hw_params

};



static int img_spdif_out_dai_probe(struct snd_soc_dai *dai)

{

	struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);



	snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL);



	snd_soc_add_dai_controls(dai, img_spdif_out_controls,

			ARRAY_SIZE(img_spdif_out_controls));



	return 0;

}



static struct snd_soc_dai_driver img_spdif_out_dai = {

	.probe = img_spdif_out_dai_probe,

	.playback = {

		.channels_min = 2,

		.channels_max = 2,

		.rates = SNDRV_PCM_RATE_8000_192000,

		.formats = SNDRV_PCM_FMTBIT_S32_LE

	},

	.ops = &img_spdif_out_dai_ops

};



static const struct snd_soc_component_driver img_spdif_out_component = {

	.name = "img-spdif-out"

};



static int img_spdif_out_probe(struct platform_device *pdev)

{

	struct img_spdif_out *spdif;

	struct resource *res;

	void __iomem *base;

	int ret;

	struct device *dev = &pdev->dev;



	spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);

	if (!spdif)

		return -ENOMEM;



	platform_set_drvdata(pdev, spdif);



	spdif->dev = &pdev->dev;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	base = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(base))

		return PTR_ERR(base);



	spdif->base = base;



	spdif->rst = devm_reset_control_get(&pdev->dev, "rst");

	if (IS_ERR(spdif->rst)) {

		if (PTR_ERR(spdif->rst) != -EPROBE_DEFER)

			dev_err(&pdev->dev, "No top level reset found\n");

		return PTR_ERR(spdif->rst);

	}



	spdif->clk_sys = devm_clk_get(&pdev->dev, "sys");

	if (IS_ERR(spdif->clk_sys)) {

		if (PTR_ERR(spdif->clk_sys) != -EPROBE_DEFER)

			dev_err(dev, "Failed to acquire clock 'sys'\n");

		return PTR_ERR(spdif->clk_sys);

	}



	spdif->clk_ref = devm_clk_get(&pdev->dev, "ref");

	if (IS_ERR(spdif->clk_ref)) {

		if (PTR_ERR(spdif->clk_ref) != -EPROBE_DEFER)

			dev_err(dev, "Failed to acquire clock 'ref'\n");

		return PTR_ERR(spdif->clk_ref);

	}



	ret = clk_prepare_enable(spdif->clk_sys);

	if (ret)

		return ret;



	img_spdif_out_writel(spdif, IMG_SPDIF_OUT_CTL_FS_MASK,

				IMG_SPDIF_OUT_CTL);



	img_spdif_out_reset(spdif);



	pm_runtime_enable(&pdev->dev);

	if (!pm_runtime_enabled(&pdev->dev)) {

		ret = img_spdif_out_resume(&pdev->dev);

		if (ret)

			goto err_pm_disable;

	}



	spin_lock_init(&spdif->lock);



	spdif->dma_data.addr = res->start + IMG_SPDIF_OUT_TX_FIFO;

	spdif->dma_data.addr_width = 4;

	spdif->dma_data.maxburst = 4;



	ret = devm_snd_soc_register_component(&pdev->dev,

			&img_spdif_out_component,

			&img_spdif_out_dai, 1);

	if (ret)

		goto err_suspend;



	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);

	if (ret)

		goto err_suspend;



	dev_dbg(&pdev->dev, "Probe successful\n");



	return 0;



err_suspend:

	if (!pm_runtime_status_suspended(&pdev->dev))

		img_spdif_out_suspend(&pdev->dev);

err_pm_disable:

	pm_runtime_disable(&pdev->dev);

	clk_disable_unprepare(spdif->clk_sys);



	return ret;

}



static int img_spdif_out_dev_remove(struct platform_device *pdev)

{

	struct img_spdif_out *spdif = platform_get_drvdata(pdev);



	pm_runtime_disable(&pdev->dev);

	if (!pm_runtime_status_suspended(&pdev->dev))

		img_spdif_out_suspend(&pdev->dev);



	clk_disable_unprepare(spdif->clk_sys);



	return 0;

}



static const struct of_device_id img_spdif_out_of_match[] = {

	{ .compatible = "img,spdif-out" },

	{}

};

MODULE_DEVICE_TABLE(of, img_spdif_out_of_match);



static const struct dev_pm_ops img_spdif_out_pm_ops = {

	SET_RUNTIME_PM_OPS(img_spdif_out_suspend,

			   img_spdif_out_resume, NULL)

};



static struct platform_driver img_spdif_out_driver = {

	.driver = {

		.name = "img-spdif-out",

		.of_match_table = img_spdif_out_of_match,

		.pm = &img_spdif_out_pm_ops

	},

	.probe = img_spdif_out_probe,

	.remove = img_spdif_out_dev_remove

};

module_platform_driver(img_spdif_out_driver);



MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");

MODULE_DESCRIPTION("IMG SPDIF Output driver");

MODULE_LICENSE("GPL v2");