Release 4.7 sound/soc/img/img-i2s-out.c

Directory: sound/soc/img
/*
 * IMG I2S 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_I2S_OUT_TX_FIFO			0x0


#define IMG_I2S_OUT_CTL				0x4

#define IMG_I2S_OUT_CTL_DATA_EN_MASK		BIT(24)

#define IMG_I2S_OUT_CTL_ACTIVE_CHAN_MASK	0xffe000

#define IMG_I2S_OUT_CTL_ACTIVE_CHAN_SHIFT	13

#define IMG_I2S_OUT_CTL_FRM_SIZE_MASK		BIT(8)

#define IMG_I2S_OUT_CTL_MASTER_MASK		BIT(6)

#define IMG_I2S_OUT_CTL_CLK_MASK		BIT(5)

#define IMG_I2S_OUT_CTL_CLK_EN_MASK		BIT(4)

#define IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK	BIT(3)

#define IMG_I2S_OUT_CTL_BCLK_POL_MASK		BIT(2)

#define IMG_I2S_OUT_CTL_ME_MASK			BIT(0)


#define IMG_I2S_OUT_CH_CTL			0x4

#define IMG_I2S_OUT_CHAN_CTL_CH_MASK		BIT(11)

#define IMG_I2S_OUT_CHAN_CTL_LT_MASK		BIT(10)

#define IMG_I2S_OUT_CHAN_CTL_FMT_MASK		0xf0

#define IMG_I2S_OUT_CHAN_CTL_FMT_SHIFT		4

#define IMG_I2S_OUT_CHAN_CTL_JUST_MASK		BIT(3)

#define IMG_I2S_OUT_CHAN_CTL_CLKT_MASK		BIT(1)

#define IMG_I2S_OUT_CHAN_CTL_ME_MASK		BIT(0)


#define IMG_I2S_OUT_CH_STRIDE			0x20


struct img_i2s_out {
	
void __iomem *base;
	
struct clk *clk_sys;
	
struct clk *clk_ref;
	
struct snd_dmaengine_dai_dma_data dma_data;
	
struct device *dev;
	
unsigned int max_i2s_chan;
	
void __iomem *channel_base;
	
bool force_clk_active;
	
unsigned int active_channels;
	
struct reset_control *rst;
	
struct snd_soc_dai_driver dai_driver;
};



static int img_i2s_out_suspend(struct device *dev)
{
	struct img_i2s_out *i2s = dev_get_drvdata(dev);

	if (!i2s->force_clk_active)
		clk_disable_unprepare(i2s->clk_ref);

	return 0;
}

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static int img_i2s_out_resume(struct device *dev)
{
	struct img_i2s_out *i2s = dev_get_drvdata(dev);
	int ret;

	if (!i2s->force_clk_active) {
		ret = clk_prepare_enable(i2s->clk_ref);
		if (ret) {
			dev_err(dev, "clk_enable failed: %d\n", ret);
			return ret;
		}
	}

	return 0;
}

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static inline void img_i2s_out_writel(struct img_i2s_out *i2s, u32 val,
					u32 reg)
{
	writel(val, i2s->base + reg);
}

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static inline u32 img_i2s_out_readl(struct img_i2s_out *i2s, u32 reg)
{
	return readl(i2s->base + reg);
}

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static inline void img_i2s_out_ch_writel(struct img_i2s_out *i2s,
					u32 chan, u32 val, u32 reg)
{
	writel(val, i2s->channel_base + (chan * IMG_I2S_OUT_CH_STRIDE) + reg);
}

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static inline u32 img_i2s_out_ch_readl(struct img_i2s_out *i2s, u32 chan,
					u32 reg)
{
	return readl(i2s->channel_base + (chan * IMG_I2S_OUT_CH_STRIDE) + reg);
}

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static inline void img_i2s_out_ch_disable(struct img_i2s_out *i2s, u32 chan)
{
	u32 reg;

	reg = img_i2s_out_ch_readl(i2s, chan, IMG_I2S_OUT_CH_CTL);
	reg &= ~IMG_I2S_OUT_CHAN_CTL_ME_MASK;
	img_i2s_out_ch_writel(i2s, chan, reg, IMG_I2S_OUT_CH_CTL);
}

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static inline void img_i2s_out_ch_enable(struct img_i2s_out *i2s, u32 chan)
{
	u32 reg;

	reg = img_i2s_out_ch_readl(i2s, chan, IMG_I2S_OUT_CH_CTL);
	reg |= IMG_I2S_OUT_CHAN_CTL_ME_MASK;
	img_i2s_out_ch_writel(i2s, chan, reg, IMG_I2S_OUT_CH_CTL);
}

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static inline void img_i2s_out_disable(struct img_i2s_out *i2s)
{
	u32 reg;

	reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
	reg &= ~IMG_I2S_OUT_CTL_ME_MASK;
	img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL);
}

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static inline void img_i2s_out_enable(struct img_i2s_out *i2s)
{
	u32 reg;

	reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
	reg |= IMG_I2S_OUT_CTL_ME_MASK;
	img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL);
}

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static void img_i2s_out_reset(struct img_i2s_out *i2s)
{
	int i;
	u32 core_ctl, chan_ctl;

	core_ctl = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL) &
			~IMG_I2S_OUT_CTL_ME_MASK &
			~IMG_I2S_OUT_CTL_DATA_EN_MASK;

	if (!i2s->force_clk_active)
		core_ctl &= ~IMG_I2S_OUT_CTL_CLK_EN_MASK;

	chan_ctl = img_i2s_out_ch_readl(i2s, 0, IMG_I2S_OUT_CH_CTL) &
			~IMG_I2S_OUT_CHAN_CTL_ME_MASK;

	reset_control_assert(i2s->rst);
	reset_control_deassert(i2s->rst);

	for (i = 0; i < i2s->max_i2s_chan; i++)
		img_i2s_out_ch_writel(i2s, i, chan_ctl, IMG_I2S_OUT_CH_CTL);

	for (i = 0; i < i2s->active_channels; i++)
		img_i2s_out_ch_enable(i2s, i);

	img_i2s_out_writel(i2s, core_ctl, IMG_I2S_OUT_CTL);
	img_i2s_out_enable(i2s);
}

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static int img_i2s_out_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
{
	struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai);
	u32 reg;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
		if (!i2s->force_clk_active)
			reg |= IMG_I2S_OUT_CTL_CLK_EN_MASK;
		reg |= IMG_I2S_OUT_CTL_DATA_EN_MASK;
		img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		img_i2s_out_reset(i2s);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

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static int img_i2s_out_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
{
	struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai);
	unsigned int channels, i2s_channels;
	long pre_div_a, pre_div_b, diff_a, diff_b, rate, clk_rate;
	int i;
	u32 reg, control_mask, control_set = 0;
	snd_pcm_format_t format;

	rate = params_rate(params);
	format = params_format(params);
	channels = params_channels(params);
	i2s_channels = channels / 2;

	if (format != SNDRV_PCM_FORMAT_S32_LE)
		return -EINVAL;

	if ((channels < 2) ||
	    (channels > (i2s->max_i2s_chan * 2)) ||
	    (channels % 2))
		return -EINVAL;

	pre_div_a = clk_round_rate(i2s->clk_ref, rate * 256);
	if (pre_div_a < 0)
		return pre_div_a;
	pre_div_b = clk_round_rate(i2s->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(i2s->clk_ref, pre_div_b);
	else
		clk_set_rate(i2s->clk_ref, pre_div_a);

	/*
         * Another driver (eg alsa machine driver) may have rejected the above
         * change. Get the current rate and set the register bit according to
         * the new minimum diff
         */
	clk_rate = clk_get_rate(i2s->clk_ref);

	diff_a = abs((clk_rate / 256) - rate);
	diff_b = abs((clk_rate / 384) - rate);

	if (diff_a > diff_b)
		control_set |= IMG_I2S_OUT_CTL_CLK_MASK;

	control_set |= ((i2s_channels - 1) <<
		       IMG_I2S_OUT_CTL_ACTIVE_CHAN_SHIFT) &
		       IMG_I2S_OUT_CTL_ACTIVE_CHAN_MASK;

	control_mask = IMG_I2S_OUT_CTL_CLK_MASK |
		       IMG_I2S_OUT_CTL_ACTIVE_CHAN_MASK;

	img_i2s_out_disable(i2s);

	reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
	reg = (reg & ~control_mask) | control_set;
	img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL);

	for (i = 0; i < i2s_channels; i++)
		img_i2s_out_ch_enable(i2s, i);

	for (; i < i2s->max_i2s_chan; i++)
		img_i2s_out_ch_disable(i2s, i);

	img_i2s_out_enable(i2s);

	i2s->active_channels = i2s_channels;

	return 0;
}

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static int img_i2s_out_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai);
	int i;
	bool force_clk_active;
	u32 chan_control_mask, control_mask, chan_control_set = 0;
	u32 reg, control_set = 0;

	force_clk_active = ((fmt & SND_SOC_DAIFMT_CLOCK_MASK) ==
			SND_SOC_DAIFMT_CONT);

	if (force_clk_active)
		control_set |= IMG_I2S_OUT_CTL_CLK_EN_MASK;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		control_set |= IMG_I2S_OUT_CTL_MASTER_MASK;
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		control_set |= IMG_I2S_OUT_CTL_BCLK_POL_MASK;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		control_set |= IMG_I2S_OUT_CTL_BCLK_POL_MASK;
		control_set |= IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		break;
	case SND_SOC_DAIFMT_IB_IF:
		control_set |= IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK;
		break;
	default:
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		chan_control_set |= IMG_I2S_OUT_CHAN_CTL_CLKT_MASK;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		break;
	default:
		return -EINVAL;
	}

	control_mask = IMG_I2S_OUT_CTL_CLK_EN_MASK |
		       IMG_I2S_OUT_CTL_MASTER_MASK |
		       IMG_I2S_OUT_CTL_BCLK_POL_MASK |
		       IMG_I2S_OUT_CTL_FRM_CLK_POL_MASK;

	chan_control_mask = IMG_I2S_OUT_CHAN_CTL_CLKT_MASK;

	img_i2s_out_disable(i2s);

	reg = img_i2s_out_readl(i2s, IMG_I2S_OUT_CTL);
	reg = (reg & ~control_mask) | control_set;
	img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL);

	for (i = 0; i < i2s->active_channels; i++)
		img_i2s_out_ch_disable(i2s, i);

	for (i = 0; i < i2s->max_i2s_chan; i++) {
		reg = img_i2s_out_ch_readl(i2s, i, IMG_I2S_OUT_CH_CTL);
		reg = (reg & ~chan_control_mask) | chan_control_set;
		img_i2s_out_ch_writel(i2s, i, reg, IMG_I2S_OUT_CH_CTL);
	}

	for (i = 0; i < i2s->active_channels; i++)
		img_i2s_out_ch_enable(i2s, i);

	img_i2s_out_enable(i2s);

	i2s->force_clk_active = force_clk_active;

	return 0;
}

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static const struct snd_soc_dai_ops img_i2s_out_dai_ops = {
	.trigger = img_i2s_out_trigger,
	.hw_params = img_i2s_out_hw_params,
	.set_fmt = img_i2s_out_set_fmt
};



static int img_i2s_out_dai_probe(struct snd_soc_dai *dai)
{
	struct img_i2s_out *i2s = snd_soc_dai_get_drvdata(dai);

	snd_soc_dai_init_dma_data(dai, &i2s->dma_data, NULL);

	return 0;
}

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static const struct snd_soc_component_driver img_i2s_out_component = {
	.name = "img-i2s-out"
};



static int img_i2s_out_dma_prepare_slave_config(struct snd_pcm_substream *st,
	struct snd_pcm_hw_params *params, struct dma_slave_config *sc)
{
	unsigned int i2s_channels = params_channels(params) / 2;
	struct snd_soc_pcm_runtime *rtd = st->private_data;
	struct snd_dmaengine_dai_dma_data *dma_data;
	int ret;

	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, st);

	ret = snd_hwparams_to_dma_slave_config(st, params, sc);
	if (ret)
		return ret;

	sc->dst_addr = dma_data->addr;
	sc->dst_addr_width = dma_data->addr_width;
	sc->dst_maxburst = 4 * i2s_channels;

	return 0;
}

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static const struct snd_dmaengine_pcm_config img_i2s_out_dma_config = {
	.prepare_slave_config = img_i2s_out_dma_prepare_slave_config
};



static int img_i2s_out_probe(struct platform_device *pdev)
{
	struct img_i2s_out *i2s;
	struct resource *res;
	void __iomem *base;
	int i, ret;
	unsigned int max_i2s_chan_pow_2;
	u32 reg;
	struct device *dev = &pdev->dev;

	i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
	if (!i2s)
		return -ENOMEM;

	platform_set_drvdata(pdev, i2s);

	i2s->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);

	i2s->base = base;

	if (of_property_read_u32(pdev->dev.of_node, "img,i2s-channels",
			&i2s->max_i2s_chan)) {
		dev_err(&pdev->dev, "No img,i2s-channels property\n");
		return -EINVAL;
	}

	max_i2s_chan_pow_2 = 1 << get_count_order(i2s->max_i2s_chan);

	i2s->channel_base = base + (max_i2s_chan_pow_2 * 0x20);

	i2s->rst = devm_reset_control_get(&pdev->dev, "rst");
	if (IS_ERR(i2s->rst)) {
		if (PTR_ERR(i2s->rst) != -EPROBE_DEFER)
			dev_err(&pdev->dev, "No top level reset found\n");
		return PTR_ERR(i2s->rst);
	}

	i2s->clk_sys = devm_clk_get(&pdev->dev, "sys");
	if (IS_ERR(i2s->clk_sys)) {
		if (PTR_ERR(i2s->clk_sys) != -EPROBE_DEFER)
			dev_err(dev, "Failed to acquire clock 'sys'\n");
		return PTR_ERR(i2s->clk_sys);
	}

	i2s->clk_ref = devm_clk_get(&pdev->dev, "ref");
	if (IS_ERR(i2s->clk_ref)) {
		if (PTR_ERR(i2s->clk_ref) != -EPROBE_DEFER)
			dev_err(dev, "Failed to acquire clock 'ref'\n");
		return PTR_ERR(i2s->clk_ref);
	}

	ret = clk_prepare_enable(i2s->clk_sys);
	if (ret)
		return ret;

	reg = IMG_I2S_OUT_CTL_FRM_SIZE_MASK;
	img_i2s_out_writel(i2s, reg, IMG_I2S_OUT_CTL);

	reg = IMG_I2S_OUT_CHAN_CTL_JUST_MASK |
		IMG_I2S_OUT_CHAN_CTL_LT_MASK |
		IMG_I2S_OUT_CHAN_CTL_CH_MASK |
		(8 << IMG_I2S_OUT_CHAN_CTL_FMT_SHIFT);

	for (i = 0; i < i2s->max_i2s_chan; i++)
		img_i2s_out_ch_writel(i2s, i, reg, IMG_I2S_OUT_CH_CTL);

	img_i2s_out_reset(i2s);

	pm_runtime_enable(&pdev->dev);
	if (!pm_runtime_enabled(&pdev->dev)) {
		ret = img_i2s_out_resume(&pdev->dev);
		if (ret)
			goto err_pm_disable;
	}

	i2s->active_channels = 1;
	i2s->dma_data.addr = res->start + IMG_I2S_OUT_TX_FIFO;
	i2s->dma_data.addr_width = 4;
	i2s->dma_data.maxburst = 4;

	i2s->dai_driver.probe = img_i2s_out_dai_probe;
	i2s->dai_driver.playback.channels_min = 2;
	i2s->dai_driver.playback.channels_max = i2s->max_i2s_chan * 2;
	i2s->dai_driver.playback.rates = SNDRV_PCM_RATE_8000_192000;
	i2s->dai_driver.playback.formats = SNDRV_PCM_FMTBIT_S32_LE;
	i2s->dai_driver.ops = &img_i2s_out_dai_ops;

	ret = devm_snd_soc_register_component(&pdev->dev,
			&img_i2s_out_component, &i2s->dai_driver, 1);
	if (ret)
		goto err_suspend;

	ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
			&img_i2s_out_dma_config, 0);
	if (ret)
		goto err_suspend;

	return 0;

err_suspend:
	if (!pm_runtime_status_suspended(&pdev->dev))
		img_i2s_out_suspend(&pdev->dev);
err_pm_disable:
	pm_runtime_disable(&pdev->dev);
	clk_disable_unprepare(i2s->clk_sys);

	return ret;
}

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static int img_i2s_out_dev_remove(struct platform_device *pdev)
{
	struct img_i2s_out *i2s = platform_get_drvdata(pdev);

	pm_runtime_disable(&pdev->dev);
	if (!pm_runtime_status_suspended(&pdev->dev))
		img_i2s_out_suspend(&pdev->dev);

	clk_disable_unprepare(i2s->clk_sys);

	return 0;
}

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static const struct of_device_id img_i2s_out_of_match[] = {
	{ .compatible = "img,i2s-out" },
	{}
};
MODULE_DEVICE_TABLE(of, img_i2s_out_of_match);


static const struct dev_pm_ops img_i2s_out_pm_ops = {
	SET_RUNTIME_PM_OPS(img_i2s_out_suspend,
			   img_i2s_out_resume, NULL)
};


static struct platform_driver img_i2s_out_driver = {
	.driver = {
		.name = "img-i2s-out",
		.of_match_table = img_i2s_out_of_match,
		.pm = &img_i2s_out_pm_ops
	},
	.probe = img_i2s_out_probe,
	.remove = img_i2s_out_dev_remove
};

module_platform_driver(img_i2s_out_driver);

MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
MODULE_DESCRIPTION("IMG I2S Output Driver");
MODULE_LICENSE("GPL v2");
Overall Contributors
Person Tokens Prop Commits CommitProp
damien horsley damien horsley 2508 100.00% 1 100.00%
Total 2508 100.00% 1 100.00%
  Directory: sound/soc/img

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
damien horsley	damien horsley	38	100.00%	1	100.00%
	Total	38	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.7 sound/soc/img/img-i2s-out.c

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