[mirror_ubuntu-jammy-kernel.git] / sound / soc / adi / axi-i2s.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012-2013, Analog Devices Inc.
 * Author: Lars-Peter Clausen <lars@metafoo.de>
 */

#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;

	bool   has_capture;
	bool   has_playback;

	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->has_playback ? &i2s->playback_dma_data : NULL,
		i2s->has_capture  ? &i2s->capture_dma_data  : NULL);

	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,
	.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 void axi_i2s_parse_of(struct axi_i2s *i2s, const struct device_node *np)
{
	struct property *dma_names;
	const char *dma_name;

	of_property_for_each_string(np, "dma-names", dma_names, dma_name) {
		if (strcmp(dma_name, "rx") == 0)
			i2s->has_capture = true;
		if (strcmp(dma_name, "tx") == 0)
			i2s->has_playback = true;
	}
}

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);

	axi_i2s_parse_of(i2s, pdev->dev.of_node);

	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;

	if (i2s->has_playback) {
		axi_i2s_dai.playback.channels_min = 2;
		axi_i2s_dai.playback.channels_max = 2;
		axi_i2s_dai.playback.rates = SNDRV_PCM_RATE_KNOT;
		axi_i2s_dai.playback.formats =
			SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE;

		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;
	}

	if (i2s->has_capture) {
		axi_i2s_dai.capture.channels_min = 2;
		axi_i2s_dai.capture.channels_max = 2;
		axi_i2s_dai.capture.rates = SNDRV_PCM_RATE_KNOT;
		axi_i2s_dai.capture.formats =
			SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_U32_LE;

		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;

	dev_info(&pdev->dev, "probed, capture %s, playback %s\n",
		 i2s->has_capture ? "enabled" : "disabled",
		 i2s->has_playback ? "enabled" : "disabled");

	return 0;

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",
		.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");
Commit	Line	Data
fda8d26e	1	// SPDX-License-Identifier: GPL-2.0-only
8f2fe346 LPC	2	/*
	3	* Copyright (C) 2012-2013, Analog Devices Inc.
	4	* Author: Lars-Peter Clausen <lars@metafoo.de>
8f2fe346 LPC	5	*/
	6
	7	#include <linux/clk.h>
	8	#include <linux/init.h>
	9	#include <linux/kernel.h>
	10	#include <linux/module.h>
	11	#include <linux/of.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/regmap.h>
	14	#include <linux/slab.h>
	15
	16	#include <sound/core.h>
	17	#include <sound/pcm.h>
	18	#include <sound/pcm_params.h>
	19	#include <sound/soc.h>
	20	#include <sound/dmaengine_pcm.h>
	21
	22	#define AXI_I2S_REG_RESET 0x00
	23	#define AXI_I2S_REG_CTRL 0x04
	24	#define AXI_I2S_REG_CLK_CTRL 0x08
	25	#define AXI_I2S_REG_STATUS 0x10
	26
	27	#define AXI_I2S_REG_RX_FIFO 0x28
	28	#define AXI_I2S_REG_TX_FIFO 0x2C
	29
	30	#define AXI_I2S_RESET_GLOBAL BIT(0)
	31	#define AXI_I2S_RESET_TX_FIFO BIT(1)
	32	#define AXI_I2S_RESET_RX_FIFO BIT(2)
	33
	34	#define AXI_I2S_CTRL_TX_EN BIT(0)
	35	#define AXI_I2S_CTRL_RX_EN BIT(1)
	36
	37	/* The frame size is configurable, but for now we always set it 64 bit */
	38	#define AXI_I2S_BITS_PER_FRAME 64
	39
	40	struct axi_i2s {
	41	struct regmap *regmap;
	42	struct clk *clk;
	43	struct clk *clk_ref;
	44
7bf7d055 LC	45	bool has_capture;
	46	bool has_playback;
	47
8f2fe346 LPC	48	struct snd_soc_dai_driver dai_driver;
	49
	50	struct snd_dmaengine_dai_dma_data capture_dma_data;
	51	struct snd_dmaengine_dai_dma_data playback_dma_data;
	52
	53	struct snd_ratnum ratnum;
	54	struct snd_pcm_hw_constraint_ratnums rate_constraints;
	55	};
	56
	57	static int axi_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
	58	struct snd_soc_dai *dai)
	59	{
	60	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	61	unsigned int mask, val;
	62
	63	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	64	mask = AXI_I2S_CTRL_RX_EN;
	65	else
	66	mask = AXI_I2S_CTRL_TX_EN;
	67
	68	switch (cmd) {
	69	case SNDRV_PCM_TRIGGER_START:
	70	case SNDRV_PCM_TRIGGER_RESUME:
	71	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	72	val = mask;
	73	break;
	74	case SNDRV_PCM_TRIGGER_STOP:
	75	case SNDRV_PCM_TRIGGER_SUSPEND:
	76	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	77	val = 0;
	78	break;
	79	default:
	80	return -EINVAL;
	81	}
	82
	83	regmap_update_bits(i2s->regmap, AXI_I2S_REG_CTRL, mask, val);
	84
	85	return 0;
	86	}
	87
	88	static int axi_i2s_hw_params(struct snd_pcm_substream *substream,
	89	struct snd_pcm_hw_params params, struct snd_soc_dai dai)
	90	{
	91	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	92	unsigned int bclk_div, word_size;
	93	unsigned int bclk_rate;
	94
	95	bclk_rate = params_rate(params) * AXI_I2S_BITS_PER_FRAME;
	96
	97	word_size = AXI_I2S_BITS_PER_FRAME / 2 - 1;
	98	bclk_div = DIV_ROUND_UP(clk_get_rate(i2s->clk_ref), bclk_rate) / 2 - 1;
	99
	100	regmap_write(i2s->regmap, AXI_I2S_REG_CLK_CTRL, (word_size << 16) \|
	101	bclk_div);
	102
	103	return 0;
	104	}
	105
	106	static int axi_i2s_startup(struct snd_pcm_substream *substream,
	107	struct snd_soc_dai *dai)
	108	{
	109	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	110	uint32_t mask;
	111	int ret;
112
113	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
114	mask = AXI_I2S_RESET_RX_FIFO;
115	else
116	mask = AXI_I2S_RESET_TX_FIFO;
117
118	regmap_write(i2s->regmap, AXI_I2S_REG_RESET, mask);
119
120	ret = snd_pcm_hw_constraint_ratnums(substream->runtime, 0,
121	SNDRV_PCM_HW_PARAM_RATE,
122	&i2s->rate_constraints);
123	if (ret)
124	return ret;
125
126	return clk_prepare_enable(i2s->clk_ref);
127	}
128
129	static void axi_i2s_shutdown(struct snd_pcm_substream *substream,
130	struct snd_soc_dai *dai)
131	{
132	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
133
134	clk_disable_unprepare(i2s->clk_ref);
135	}
136
137	static int axi_i2s_dai_probe(struct snd_soc_dai *dai)
138	{
139	struct axi_i2s *i2s = snd_soc_dai_get_drvdata(dai);
140
7bf7d055 LC	141	snd_soc_dai_init_dma_data(
	142	dai,
	143	i2s->has_playback ? &i2s->playback_dma_data : NULL,
	144	i2s->has_capture ? &i2s->capture_dma_data : NULL);
8f2fe346 LPC	145
	146	return 0;
	147	}
	148
	149	static const struct snd_soc_dai_ops axi_i2s_dai_ops = {
	150	.startup = axi_i2s_startup,
	151	.shutdown = axi_i2s_shutdown,
	152	.trigger = axi_i2s_trigger,
	153	.hw_params = axi_i2s_hw_params,
	154	};
	155
	156	static struct snd_soc_dai_driver axi_i2s_dai = {
	157	.probe = axi_i2s_dai_probe,
8f2fe346 LPC	158	.ops = &axi_i2s_dai_ops,
	159	.symmetric_rates = 1,
	160	};
	161
	162	static const struct snd_soc_component_driver axi_i2s_component = {
	163	.name = "axi-i2s",
	164	};
	165
	166	static const struct regmap_config axi_i2s_regmap_config = {
	167	.reg_bits = 32,
	168	.reg_stride = 4,
	169	.val_bits = 32,
	170	.max_register = AXI_I2S_REG_STATUS,
	171	};
	172
7bf7d055 LC	173	static void axi_i2s_parse_of(struct axi_i2s i2s, const struct device_node np)
	174	{
	175	struct property *dma_names;
	176	const char *dma_name;
	177
	178	of_property_for_each_string(np, "dma-names", dma_names, dma_name) {
	179	if (strcmp(dma_name, "rx") == 0)
	180	i2s->has_capture = true;
	181	if (strcmp(dma_name, "tx") == 0)
	182	i2s->has_playback = true;
	183	}
	184	}
	185
8f2fe346 LPC	186	static int axi_i2s_probe(struct platform_device *pdev)
	187	{
	188	struct resource *res;
	189	struct axi_i2s *i2s;
	190	void __iomem *base;
	191	int ret;
	192
	193	i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
	194	if (!i2s)
	195	return -ENOMEM;
	196
	197	platform_set_drvdata(pdev, i2s);
	198
7bf7d055 LC	199	axi_i2s_parse_of(i2s, pdev->dev.of_node);
7bf7d055 LC	200
8f2fe346	201	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
7fd7a48b FW	202	base = devm_ioremap_resource(&pdev->dev, res);
	203	if (IS_ERR(base))
	204	return PTR_ERR(base);
8f2fe346 LPC	205
	206	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, base,
	207	&axi_i2s_regmap_config);
	208	if (IS_ERR(i2s->regmap))
	209	return PTR_ERR(i2s->regmap);
	210
	211	i2s->clk = devm_clk_get(&pdev->dev, "axi");
	212	if (IS_ERR(i2s->clk))
	213	return PTR_ERR(i2s->clk);
	214
	215	i2s->clk_ref = devm_clk_get(&pdev->dev, "ref");
	216	if (IS_ERR(i2s->clk_ref))
	217	return PTR_ERR(i2s->clk_ref);
	218
	219	ret = clk_prepare_enable(i2s->clk);
	220	if (ret)
	221	return ret;
	222
7bf7d055 LC	223	if (i2s->has_playback) {
	224	axi_i2s_dai.playback.channels_min = 2;
	225	axi_i2s_dai.playback.channels_max = 2;
	226	axi_i2s_dai.playback.rates = SNDRV_PCM_RATE_KNOT;
	227	axi_i2s_dai.playback.formats =
	228	SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_U32_LE;
	229
	230	i2s->playback_dma_data.addr = res->start + AXI_I2S_REG_TX_FIFO;
	231	i2s->playback_dma_data.addr_width = 4;
	232	i2s->playback_dma_data.maxburst = 1;
	233	}
	234
	235	if (i2s->has_capture) {
	236	axi_i2s_dai.capture.channels_min = 2;
	237	axi_i2s_dai.capture.channels_max = 2;
	238	axi_i2s_dai.capture.rates = SNDRV_PCM_RATE_KNOT;
	239	axi_i2s_dai.capture.formats =
	240	SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_U32_LE;
8f2fe346	241
7bf7d055 LC	242	i2s->capture_dma_data.addr = res->start + AXI_I2S_REG_RX_FIFO;
	243	i2s->capture_dma_data.addr_width = 4;
	244	i2s->capture_dma_data.maxburst = 1;
	245	}
8f2fe346 LPC	246
	247	i2s->ratnum.num = clk_get_rate(i2s->clk_ref) / 2 / AXI_I2S_BITS_PER_FRAME;
	248	i2s->ratnum.den_step = 1;
	249	i2s->ratnum.den_min = 1;
	250	i2s->ratnum.den_max = 64;
	251
	252	i2s->rate_constraints.rats = &i2s->ratnum;
	253	i2s->rate_constraints.nrats = 1;
	254
	255	regmap_write(i2s->regmap, AXI_I2S_REG_RESET, AXI_I2S_RESET_GLOBAL);
	256
	257	ret = devm_snd_soc_register_component(&pdev->dev, &axi_i2s_component,
	258	&axi_i2s_dai, 1);
	259	if (ret)
	260	goto err_clk_disable;
	261
153e66f5	262	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
8f2fe346 LPC	263	if (ret)
	264	goto err_clk_disable;
	265
7bf7d055 LC	266	dev_info(&pdev->dev, "probed, capture %s, playback %s\n",
	267	i2s->has_capture ? "enabled" : "disabled",
	268	i2s->has_playback ? "enabled" : "disabled");
	269
ae6f636b AJ	270	return 0;
ae6f636b AJ	271
8f2fe346 LPC	272	err_clk_disable:
	273	clk_disable_unprepare(i2s->clk);
	274	return ret;
	275	}
	276
	277	static int axi_i2s_dev_remove(struct platform_device *pdev)
	278	{
	279	struct axi_i2s *i2s = platform_get_drvdata(pdev);
	280
	281	clk_disable_unprepare(i2s->clk);
	282
	283	return 0;
	284	}
	285
	286	static const struct of_device_id axi_i2s_of_match[] = {
	287	{ .compatible = "adi,axi-i2s-1.00.a", },
	288	{},
	289	};
	290	MODULE_DEVICE_TABLE(of, axi_i2s_of_match);
	291
	292	static struct platform_driver axi_i2s_driver = {
	293	.driver = {
	294	.name = "axi-i2s",
8f2fe346 LPC	295	.of_match_table = axi_i2s_of_match,
	296	},
	297	.probe = axi_i2s_probe,
	298	.remove = axi_i2s_dev_remove,
	299	};
	300	module_platform_driver(axi_i2s_driver);
	301
	302	MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
	303	MODULE_DESCRIPTION("AXI I2S driver");
	304	MODULE_LICENSE("GPL");