sound/soc/adi/axi-i2s.c - arm/linux-arm-legacy - Git at Google

 /*
  * Copyright (C) 2012-2013, Analog Devices Inc.
  * Author: Lars-Peter Clausen <lars@metafoo.de>
  *
  * Licensed under the GPL-2.
  */

 #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/regmap.h>
 #include <linux/slab.h>

 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/dmaengine_pcm.h>

 #define AXI_I2S_REG_RESET	0x00
 #define AXI_I2S_REG_CTRL	0x04
 #define AXI_I2S_REG_CLK_CTRL	0x08
 #define AXI_I2S_REG_STATUS	0x10

 #define AXI_I2S_REG_RX_FIFO	0x28
 #define AXI_I2S_REG_TX_FIFO	0x2C

 #define AXI_I2S_RESET_GLOBAL	BIT(0)
 #define AXI_I2S_RESET_TX_FIFO	BIT(1)
 #define AXI_I2S_RESET_RX_FIFO	BIT(2)

 #define AXI_I2S_CTRL_TX_EN	BIT(0)
 #define AXI_I2S_CTRL_RX_EN	BIT(1)

 /* The frame size is configurable, but for now we always set it 64 bit */
 #define AXI_I2S_BITS_PER_FRAME 64

 struct axi_i2s {
 	struct regmap *regmap;
 	struct clk *clk;
 	struct clk *clk_ref;

 	struct snd_soc_dai_driver dai_driver;

 	struct snd_dmaengine_dai_dma_data capture_dma_data;
 	struct snd_dmaengine_dai_dma_data playback_dma_data;

 	struct snd_ratnum ratnum;
 	struct snd_pcm_hw_constraint_ratnums rate_constraints;
 };

 static int axi_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 	struct snd_soc_dai *dai)
 {
 	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	unsigned int mask, val;

 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		mask = AXI_I2S_CTRL_RX_EN;
 	else
 		mask = AXI_I2S_CTRL_TX_EN;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		val = mask;
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		val = 0;
 		break;
 	default:
 		return -EINVAL;
 	}

 	regmap_update_bits(i2s->regmap, AXI_I2S_REG_CTRL, mask, val);

 	return 0;
 }

 static int axi_i2s_hw_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 {
 	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	unsigned int bclk_div, word_size;
 	unsigned int bclk_rate;

 	bclk_rate = params_rate(params) * AXI_I2S_BITS_PER_FRAME;

 	word_size = AXI_I2S_BITS_PER_FRAME / 2 - 1;
 	bclk_div = DIV_ROUND_UP(clk_get_rate(i2s->clk_ref), bclk_rate) / 2 - 1;

 	regmap_write(i2s->regmap, AXI_I2S_REG_CLK_CTRL, (word_size << 16) |
 		bclk_div);

 	return 0;
 }

 static int axi_i2s_startup(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
 	uint32_t mask;
 	int ret;

 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		mask = AXI_I2S_RESET_RX_FIFO;
 	else
 		mask = AXI_I2S_RESET_TX_FIFO;

 	regmap_write(i2s->regmap, AXI_I2S_REG_RESET, mask);

 	ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
 			   SNDRV_PCM_HW_PARAM_RATE,
 			   &i2s->rate_constraints);
 	if (ret)
 		return ret;

 	return clk_prepare_enable(i2s->clk_ref);
 }

 static void axi_i2s_shutdown(struct snd_pcm_substream *substream,
 	struct snd_soc_dai *dai)
 {
 	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);

 	clk_disable_unprepare(i2s->clk_ref);
 }

 static int axi_i2s_dai_probe(struct snd_soc_dai *dai)
 {
 	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);

 	snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
 		&i2s->capture_dma_data);

 	return 0;
 }

 static const struct snd_soc_dai_ops axi_i2s_dai_ops = {
 	.startup = axi_i2s_startup,
 	.shutdown = axi_i2s_shutdown,
 	.trigger = axi_i2s_trigger,
 	.hw_params = axi_i2s_hw_params,
 };

 static struct snd_soc_dai_driver axi_i2s_dai = {
 	.probe = axi_i2s_dai_probe,
 	.playback = {
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_KNOT,
 		.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE,
 	},
 	.capture = {
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_KNOT,
 		.formats = SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE,
 	},
 	.ops = &axi_i2s_dai_ops,
 	.symmetric_rates = 1,
 };

 static const struct snd_soc_component_driver axi_i2s_component = {
 	.name = "axi-i2s",
 };

 static const struct regmap_config axi_i2s_regmap_config = {
 	.reg_bits = 32,
 	.reg_stride = 4,
 	.val_bits = 32,
 	.max_register = AXI_I2S_REG_STATUS,
 };

 static int axi_i2s_probe(struct platform_device *pdev)
 {
 	struct resource *res;
 	struct axi_i2s *i2s;
 	void __iomem *base;
 	int ret;

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

 	platform_set_drvdata(pdev, i2s);

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);

 	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, base,
 		&axi_i2s_regmap_config);
 	if (IS_ERR(i2s->regmap))
 		return PTR_ERR(i2s->regmap);

 	i2s->clk = devm_clk_get(&pdev->dev, "axi");
 	if (IS_ERR(i2s->clk))
 		return PTR_ERR(i2s->clk);

 	i2s->clk_ref = devm_clk_get(&pdev->dev, "ref");
 	if (IS_ERR(i2s->clk_ref))
 		return PTR_ERR(i2s->clk_ref);

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

 	i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO;
 	i2s->playback_dma_data.addr_width = 4;
 	i2s->playback_dma_data.maxburst = 1;

 	i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO;
 	i2s->capture_dma_data.addr_width = 4;
 	i2s->capture_dma_data.maxburst = 1;

 	i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME;
 	i2s->ratnum.den_step = 1;
 	i2s->ratnum.den_min = 1;
 	i2s->ratnum.den_max = 64;

 	i2s->rate_constraints.rats = &i2s->ratnum;
 	i2s->rate_constraints.nrats = 1;

 	regmap_write(i2s->regmap, AXI_I2S_REG_RESET, AXI_I2S_RESET_GLOBAL);

 	ret = devm_snd_soc_register_component(&pdev->dev, &axi_i2s_component,
 					 &axi_i2s_dai, 1);
 	if (ret)
 		goto err_clk_disable;

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

 err_clk_disable:
 	clk_disable_unprepare(i2s->clk);
 	return ret;
 }

 static int axi_i2s_dev_remove(struct platform_device *pdev)
 {
 	struct axi_i2s *i2s = platform_get_drvdata(pdev);

 	clk_disable_unprepare(i2s->clk);

 	return 0;
 }

 static const struct of_device_id axi_i2s_of_match[] = {
 	{ .compatible = "adi,axi-i2s-1.00.a", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, axi_i2s_of_match);

 static struct platform_driver axi_i2s_driver = {
 	.driver = {
 		.name = "axi-i2s",
 		.owner = THIS_MODULE,
 		.of_match_table = axi_i2s_of_match,
 	},
 	.probe = axi_i2s_probe,
 	.remove = axi_i2s_dev_remove,
 };
 module_platform_driver(axi_i2s_driver);

 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
 MODULE_DESCRIPTION("AXI I2S driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) 2012-2013, Analog Devices Inc.
	* Author: Lars-Peter Clausen <lars@metafoo.de>
	*
	* Licensed under the GPL-2.
	*/

	#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/regmap.h>
	#include <linux/slab.h>

	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/dmaengine_pcm.h>

	#define AXI_I2S_REG_RESET 0x00
	#define AXI_I2S_REG_CTRL 0x04
	#define AXI_I2S_REG_CLK_CTRL 0x08
	#define AXI_I2S_REG_STATUS 0x10

	#define AXI_I2S_REG_RX_FIFO 0x28
	#define AXI_I2S_REG_TX_FIFO 0x2C

	#define AXI_I2S_RESET_GLOBAL BIT(0)
	#define AXI_I2S_RESET_TX_FIFO BIT(1)
	#define AXI_I2S_RESET_RX_FIFO BIT(2)

	#define AXI_I2S_CTRL_TX_EN BIT(0)
	#define AXI_I2S_CTRL_RX_EN BIT(1)

	/* The frame size is configurable, but for now we always set it 64 bit */
	#define AXI_I2S_BITS_PER_FRAME 64

	struct axi_i2s {
	struct regmap *regmap;
	struct clk *clk;
	struct clk *clk_ref;

	struct snd_soc_dai_driver dai_driver;

	struct snd_dmaengine_dai_dma_data capture_dma_data;
	struct snd_dmaengine_dai_dma_data playback_dma_data;

	struct snd_ratnum ratnum;
	struct snd_pcm_hw_constraint_ratnums rate_constraints;
	};

	static int axi_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
	struct snd_soc_dai *dai)
	{
	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	unsigned int mask, val;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	mask = AXI_I2S_CTRL_RX_EN;
	else
	mask = AXI_I2S_CTRL_TX_EN;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	val = mask;
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	val = 0;
	break;
	default:
	return -EINVAL;
	}

	regmap_update_bits(i2s->regmap, AXI_I2S_REG_CTRL, mask, val);

	return 0;
	}

	static int axi_i2s_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params params, struct snd_soc_dai dai)
	{
	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	unsigned int bclk_div, word_size;
	unsigned int bclk_rate;

	bclk_rate = params_rate(params) * AXI_I2S_BITS_PER_FRAME;

	word_size = AXI_I2S_BITS_PER_FRAME / 2 - 1;
	bclk_div = DIV_ROUND_UP(clk_get_rate(i2s->clk_ref), bclk_rate) / 2 - 1;

	regmap_write(i2s->regmap, AXI_I2S_REG_CLK_CTRL, (word_size << 16) \|
	bclk_div);

	return 0;
	}

	static int axi_i2s_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	uint32_t mask;
	int ret;

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	mask = AXI_I2S_RESET_RX_FIFO;
	else
	mask = AXI_I2S_RESET_TX_FIFO;

	regmap_write(i2s->regmap, AXI_I2S_REG_RESET, mask);

	ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
	SNDRV_PCM_HW_PARAM_RATE,
	&i2s->rate_constraints);
	if (ret)
	return ret;

	return clk_prepare_enable(i2s->clk_ref);
	}

	static void axi_i2s_shutdown(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	clk_disable_unprepare(i2s->clk_ref);
	}

	static int axi_i2s_dai_probe(struct snd_soc_dai *dai)
	{
	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
	&i2s->capture_dma_data);

	return 0;
	}

	static const struct snd_soc_dai_ops axi_i2s_dai_ops = {
	.startup = axi_i2s_startup,
	.shutdown = axi_i2s_shutdown,
	.trigger = axi_i2s_trigger,
	.hw_params = axi_i2s_hw_params,
	};

	static struct snd_soc_dai_driver axi_i2s_dai = {
	.probe = axi_i2s_dai_probe,
	.playback = {
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_KNOT,
	.formats = SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_U32_LE,
	},
	.capture = {
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_KNOT,
	.formats = SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_U32_LE,
	},
	.ops = &axi_i2s_dai_ops,
	.symmetric_rates = 1,
	};

	static const struct snd_soc_component_driver axi_i2s_component = {
	.name = "axi-i2s",
	};

	static const struct regmap_config axi_i2s_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.max_register = AXI_I2S_REG_STATUS,
	};

	static int axi_i2s_probe(struct platform_device *pdev)
	{
	struct resource *res;
	struct axi_i2s *i2s;
	void __iomem *base;
	int ret;

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

	platform_set_drvdata(pdev, i2s);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(base))
	return PTR_ERR(base);

	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, base,
	&axi_i2s_regmap_config);
	if (IS_ERR(i2s->regmap))
	return PTR_ERR(i2s->regmap);

	i2s->clk = devm_clk_get(&pdev->dev, "axi");
	if (IS_ERR(i2s->clk))
	return PTR_ERR(i2s->clk);

	i2s->clk_ref = devm_clk_get(&pdev->dev, "ref");
	if (IS_ERR(i2s->clk_ref))
	return PTR_ERR(i2s->clk_ref);

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

	i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO;
	i2s->playback_dma_data.addr_width = 4;
	i2s->playback_dma_data.maxburst = 1;

	i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO;
	i2s->capture_dma_data.addr_width = 4;
	i2s->capture_dma_data.maxburst = 1;

	i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME;
	i2s->ratnum.den_step = 1;
	i2s->ratnum.den_min = 1;
	i2s->ratnum.den_max = 64;

	i2s->rate_constraints.rats = &i2s->ratnum;
	i2s->rate_constraints.nrats = 1;

	regmap_write(i2s->regmap, AXI_I2S_REG_RESET, AXI_I2S_RESET_GLOBAL);

	ret = devm_snd_soc_register_component(&pdev->dev, &axi_i2s_component,
	&axi_i2s_dai, 1);
	if (ret)
	goto err_clk_disable;

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

	err_clk_disable:
	clk_disable_unprepare(i2s->clk);
	return ret;
	}

	static int axi_i2s_dev_remove(struct platform_device *pdev)
	{
	struct axi_i2s *i2s = platform_get_drvdata(pdev);

	clk_disable_unprepare(i2s->clk);

	return 0;
	}

	static const struct of_device_id axi_i2s_of_match[] = {
	{ .compatible = "adi,axi-i2s-1.00.a", },
	{},
	};
	MODULE_DEVICE_TABLE(of, axi_i2s_of_match);

	static struct platform_driver axi_i2s_driver = {
	.driver = {
	.name = "axi-i2s",
	.owner = THIS_MODULE,
	.of_match_table = axi_i2s_of_match,
	},
	.probe = axi_i2s_probe,
	.remove = axi_i2s_dev_remove,
	};
	module_platform_driver(axi_i2s_driver);

	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	MODULE_DESCRIPTION("AXI I2S driver");
	MODULE_LICENSE("GPL");