[linux.git] / sound / soc / omap / omap-dmic.c

/*
 * omap-dmic.c  --  OMAP ASoC DMIC DAI driver
 *
 * Copyright (C) 2010 - 2011 Texas Instruments
 *
 * Author: David Lambert <[email protected]>
 *	   Misael Lopez Cruz <[email protected]>
 *	   Liam Girdwood <[email protected]>
 *	   Peter Ujfalusi <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/of_device.h>

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

#include "omap-dmic.h"
#include "sdma-pcm.h"

struct omap_dmic {
	struct device *dev;
	void __iomem *io_base;
	struct clk *fclk;
	struct pm_qos_request pm_qos_req;
	int latency;
	int fclk_freq;
	int out_freq;
	int clk_div;
	int sysclk;
	int threshold;
	u32 ch_enabled;
	bool active;
	struct mutex mutex;

	struct snd_dmaengine_dai_dma_data dma_data;
};

static inline void omap_dmic_write(struct omap_dmic *dmic, u16 reg, u32 val)
{
	writel_relaxed(val, dmic->io_base + reg);
}

static inline int omap_dmic_read(struct omap_dmic *dmic, u16 reg)
{
	return readl_relaxed(dmic->io_base + reg);
}

static inline void omap_dmic_start(struct omap_dmic *dmic)
{
	u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);

	/* Configure DMA controller */
	omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_SET_REG,
			OMAP_DMIC_DMA_ENABLE);

	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl | dmic->ch_enabled);
}

static inline void omap_dmic_stop(struct omap_dmic *dmic)
{
	u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
			ctrl & ~OMAP_DMIC_UP_ENABLE_MASK);

	/* Disable DMA request generation */
	omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_CLR_REG,
			OMAP_DMIC_DMA_ENABLE);

}

static inline int dmic_is_enabled(struct omap_dmic *dmic)
{
	return omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG) &
						OMAP_DMIC_UP_ENABLE_MASK;
}

static int omap_dmic_dai_startup(struct snd_pcm_substream *substream,
				  struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	int ret = 0;

	mutex_lock(&dmic->mutex);

	if (!dai->active)
		dmic->active = 1;
	else
		ret = -EBUSY;

	mutex_unlock(&dmic->mutex);

	return ret;
}

static void omap_dmic_dai_shutdown(struct snd_pcm_substream *substream,
				    struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	mutex_lock(&dmic->mutex);

	pm_qos_remove_request(&dmic->pm_qos_req);

	if (!dai->active)
		dmic->active = 0;

	mutex_unlock(&dmic->mutex);
}

static int omap_dmic_select_divider(struct omap_dmic *dmic, int sample_rate)
{
	int divider = -EINVAL;

	/*
	 * 192KHz rate is only supported with 19.2MHz/3.84MHz clock
	 * configuration.
	 */
	if (sample_rate == 192000) {
		if (dmic->fclk_freq == 19200000 && dmic->out_freq == 3840000)
			divider = 0x6; /* Divider: 5 (192KHz sampling rate) */
		else
			dev_err(dmic->dev,
				"invalid clock configuration for 192KHz\n");

		return divider;
	}

	switch (dmic->out_freq) {
	case 1536000:
		if (dmic->fclk_freq != 24576000)
			goto div_err;
		divider = 0x4; /* Divider: 16 */
		break;
	case 2400000:
		switch (dmic->fclk_freq) {
		case 12000000:
			divider = 0x5; /* Divider: 5 */
			break;
		case 19200000:
			divider = 0x0; /* Divider: 8 */
			break;
		case 24000000:
			divider = 0x2; /* Divider: 10 */
			break;
		default:
			goto div_err;
		}
		break;
	case 3072000:
		if (dmic->fclk_freq != 24576000)
			goto div_err;
		divider = 0x3; /* Divider: 8 */
		break;
	case 3840000:
		if (dmic->fclk_freq != 19200000)
			goto div_err;
		divider = 0x1; /* Divider: 5 (96KHz sampling rate) */
		break;
	default:
		dev_err(dmic->dev, "invalid out frequency: %dHz\n",
			dmic->out_freq);
		break;
	}

	return divider;

div_err:
	dev_err(dmic->dev, "invalid out frequency %dHz for %dHz input\n",
		dmic->out_freq, dmic->fclk_freq);
	return -EINVAL;
}

static int omap_dmic_dai_hw_params(struct snd_pcm_substream *substream,
				    struct snd_pcm_hw_params *params,
				    struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	struct snd_dmaengine_dai_dma_data *dma_data;
	int channels;

	dmic->clk_div = omap_dmic_select_divider(dmic, params_rate(params));
	if (dmic->clk_div < 0) {
		dev_err(dmic->dev, "no valid divider for %dHz from %dHz\n",
			dmic->out_freq, dmic->fclk_freq);
		return -EINVAL;
	}

	dmic->ch_enabled = 0;
	channels = params_channels(params);
	switch (channels) {
	case 6:
		dmic->ch_enabled |= OMAP_DMIC_UP3_ENABLE;
		/* fall through */
	case 4:
		dmic->ch_enabled |= OMAP_DMIC_UP2_ENABLE;
		/* fall through */
	case 2:
		dmic->ch_enabled |= OMAP_DMIC_UP1_ENABLE;
		break;
	default:
		dev_err(dmic->dev, "invalid number of legacy channels\n");
		return -EINVAL;
	}

	/* packet size is threshold * channels */
	dma_data = snd_soc_dai_get_dma_data(dai, substream);
	dma_data->maxburst = dmic->threshold * channels;
	dmic->latency = (OMAP_DMIC_THRES_MAX - dmic->threshold) * USEC_PER_SEC /
			params_rate(params);

	return 0;
}

static int omap_dmic_dai_prepare(struct snd_pcm_substream *substream,
				  struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	u32 ctrl;

	if (pm_qos_request_active(&dmic->pm_qos_req))
		pm_qos_update_request(&dmic->pm_qos_req, dmic->latency);

	/* Configure uplink threshold */
	omap_dmic_write(dmic, OMAP_DMIC_FIFO_CTRL_REG, dmic->threshold);

	ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);

	/* Set dmic out format */
	ctrl &= ~(OMAP_DMIC_FORMAT | OMAP_DMIC_POLAR_MASK);
	ctrl |= (OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 |
		 OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);

	/* Configure dmic clock divider */
	ctrl &= ~OMAP_DMIC_CLK_DIV_MASK;
	ctrl |= OMAP_DMIC_CLK_DIV(dmic->clk_div);

	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl);

	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
			ctrl | OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 |
			OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);

	return 0;
}

static int omap_dmic_dai_trigger(struct snd_pcm_substream *substream,
				  int cmd, struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		omap_dmic_start(dmic);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		omap_dmic_stop(dmic);
		break;
	default:
		break;
	}

	return 0;
}

static int omap_dmic_select_fclk(struct omap_dmic *dmic, int clk_id,
				 unsigned int freq)
{
	struct clk *parent_clk, *mux;
	char *parent_clk_name;
	int ret = 0;

	switch (freq) {
	case 12000000:
	case 19200000:
	case 24000000:
	case 24576000:
		break;
	default:
		dev_err(dmic->dev, "invalid input frequency: %dHz\n", freq);
		dmic->fclk_freq = 0;
		return -EINVAL;
	}

	if (dmic->sysclk == clk_id) {
		dmic->fclk_freq = freq;
		return 0;
	}

	/* re-parent not allowed if a stream is ongoing */
	if (dmic->active && dmic_is_enabled(dmic)) {
		dev_err(dmic->dev, "can't re-parent when DMIC active\n");
		return -EBUSY;
	}

	switch (clk_id) {
	case OMAP_DMIC_SYSCLK_PAD_CLKS:
		parent_clk_name = "pad_clks_ck";
		break;
	case OMAP_DMIC_SYSCLK_SLIMBLUS_CLKS:
		parent_clk_name = "slimbus_clk";
		break;
	case OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS:
		parent_clk_name = "dmic_sync_mux_ck";
		break;
	default:
		dev_err(dmic->dev, "fclk clk_id (%d) not supported\n", clk_id);
		return -EINVAL;
	}

	parent_clk = clk_get(dmic->dev, parent_clk_name);
	if (IS_ERR(parent_clk)) {
		dev_err(dmic->dev, "can't get %s\n", parent_clk_name);
		return -ENODEV;
	}

	mux = clk_get_parent(dmic->fclk);
	if (IS_ERR(mux)) {
		dev_err(dmic->dev, "can't get fck mux parent\n");
		clk_put(parent_clk);
		return -ENODEV;
	}

	mutex_lock(&dmic->mutex);
	if (dmic->active) {
		/* disable clock while reparenting */
		pm_runtime_put_sync(dmic->dev);
		ret = clk_set_parent(mux, parent_clk);
		pm_runtime_get_sync(dmic->dev);
	} else {
		ret = clk_set_parent(mux, parent_clk);
	}
	mutex_unlock(&dmic->mutex);

	if (ret < 0) {
		dev_err(dmic->dev, "re-parent failed\n");
		goto err_busy;
	}

	dmic->sysclk = clk_id;
	dmic->fclk_freq = freq;

err_busy:
	clk_put(mux);
	clk_put(parent_clk);

	return ret;
}

static int omap_dmic_select_outclk(struct omap_dmic *dmic, int clk_id,
				    unsigned int freq)
{
	int ret = 0;

	if (clk_id != OMAP_DMIC_ABE_DMIC_CLK) {
		dev_err(dmic->dev, "output clk_id (%d) not supported\n",
			clk_id);
		return -EINVAL;
	}

	switch (freq) {
	case 1536000:
	case 2400000:
	case 3072000:
	case 3840000:
		dmic->out_freq = freq;
		break;
	default:
		dev_err(dmic->dev, "invalid out frequency: %dHz\n", freq);
		dmic->out_freq = 0;
		ret = -EINVAL;
	}

	return ret;
}

static int omap_dmic_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
				    unsigned int freq, int dir)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	if (dir == SND_SOC_CLOCK_IN)
		return omap_dmic_select_fclk(dmic, clk_id, freq);
	else if (dir == SND_SOC_CLOCK_OUT)
		return omap_dmic_select_outclk(dmic, clk_id, freq);

	dev_err(dmic->dev, "invalid clock direction (%d)\n", dir);
	return -EINVAL;
}

static const struct snd_soc_dai_ops omap_dmic_dai_ops = {
	.startup	= omap_dmic_dai_startup,
	.shutdown	= omap_dmic_dai_shutdown,
	.hw_params	= omap_dmic_dai_hw_params,
	.prepare	= omap_dmic_dai_prepare,
	.trigger	= omap_dmic_dai_trigger,
	.set_sysclk	= omap_dmic_set_dai_sysclk,
};

static int omap_dmic_probe(struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	pm_runtime_enable(dmic->dev);

	/* Disable lines while request is ongoing */
	pm_runtime_get_sync(dmic->dev);
	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, 0x00);
	pm_runtime_put_sync(dmic->dev);

	/* Configure DMIC threshold value */
	dmic->threshold = OMAP_DMIC_THRES_MAX - 3;

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

	return 0;
}

static int omap_dmic_remove(struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	pm_runtime_disable(dmic->dev);

	return 0;
}

static struct snd_soc_dai_driver omap_dmic_dai = {
	.name = "omap-dmic",
	.probe = omap_dmic_probe,
	.remove = omap_dmic_remove,
	.capture = {
		.channels_min = 2,
		.channels_max = 6,
		.rates = SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000,
		.formats = SNDRV_PCM_FMTBIT_S32_LE,
		.sig_bits = 24,
	},
	.ops = &omap_dmic_dai_ops,
};

static const struct snd_soc_component_driver omap_dmic_component = {
	.name		= "omap-dmic",
};

static int asoc_dmic_probe(struct platform_device *pdev)
{
	struct omap_dmic *dmic;
	struct resource *res;
	int ret;

	dmic = devm_kzalloc(&pdev->dev, sizeof(struct omap_dmic), GFP_KERNEL);
	if (!dmic)
		return -ENOMEM;

	platform_set_drvdata(pdev, dmic);
	dmic->dev = &pdev->dev;
	dmic->sysclk = OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS;

	mutex_init(&dmic->mutex);

	dmic->fclk = devm_clk_get(dmic->dev, "fck");
	if (IS_ERR(dmic->fclk)) {
		dev_err(dmic->dev, "cant get fck\n");
		return -ENODEV;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
	if (!res) {
		dev_err(dmic->dev, "invalid dma memory resource\n");
		return -ENODEV;
	}
	dmic->dma_data.addr = res->start + OMAP_DMIC_DATA_REG;

	dmic->dma_data.filter_data = "up_link";

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
	dmic->io_base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(dmic->io_base))
		return PTR_ERR(dmic->io_base);


	ret = devm_snd_soc_register_component(&pdev->dev,
					      &omap_dmic_component,
					      &omap_dmic_dai, 1);
	if (ret)
		return ret;

	ret = sdma_pcm_platform_register(&pdev->dev, NULL, "up_link");
	if (ret)
		return ret;

	return 0;
}

static const struct of_device_id omap_dmic_of_match[] = {
	{ .compatible = "ti,omap4-dmic", },
	{ }
};
MODULE_DEVICE_TABLE(of, omap_dmic_of_match);

static struct platform_driver asoc_dmic_driver = {
	.driver = {
		.name = "omap-dmic",
		.of_match_table = omap_dmic_of_match,
	},
	.probe = asoc_dmic_probe,
};

module_platform_driver(asoc_dmic_driver);

MODULE_ALIAS("platform:omap-dmic");
MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
MODULE_DESCRIPTION("OMAP DMIC ASoC Interface");
MODULE_LICENSE("GPL");
Commit	Line	Data
fd26f947 PU	1	/*
	2	* omap-dmic.c -- OMAP ASoC DMIC DAI driver
	3	*
	4	* Copyright (C) 2010 - 2011 Texas Instruments
	5	*
	6	* Author: David Lambert <[email protected]>
	7	* Misael Lopez Cruz <[email protected]>
	8	* Liam Girdwood <[email protected]>
	9	* Peter Ujfalusi <[email protected]>
	10	*
	11	* This program is free software; you can redistribute it and/or
	12	* modify it under the terms of the GNU General Public License
	13	* version 2 as published by the Free Software Foundation.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	23	* 02110-1301 USA
	24	*
	25	*/
	26
	27	#include <linux/init.h>
	28	#include <linux/module.h>
	29	#include <linux/platform_device.h>
	30	#include <linux/err.h>
	31	#include <linux/clk.h>
	32	#include <linux/io.h>
	33	#include <linux/slab.h>
	34	#include <linux/pm_runtime.h>
2ec1be37	35	#include <linux/of_device.h>
fd26f947 PU	36
	37	#include <sound/core.h>
	38	#include <sound/pcm.h>
	39	#include <sound/pcm_params.h>
	40	#include <sound/initval.h>
	41	#include <sound/soc.h>
09ae3aaf	42	#include <sound/dmaengine_pcm.h>
fd26f947	43
fd26f947	44	#include "omap-dmic.h"
87dbec53	45	#include "sdma-pcm.h"
fd26f947 PU	46
	47	struct omap_dmic {
	48	struct device *dev;
	49	void __iomem *io_base;
	50	struct clk *fclk;
ffdcc363 PU	51	struct pm_qos_request pm_qos_req;
ffdcc363 PU	52	int latency;
fd26f947 PU	53	int fclk_freq;
	54	int out_freq;
	55	int clk_div;
	56	int sysclk;
	57	int threshold;
	58	u32 ch_enabled;
	59	bool active;
	60	struct mutex mutex;
fd26f947	61
09ae3aaf	62	struct snd_dmaengine_dai_dma_data dma_data;
fd26f947 PU	63	};
	64
	65	static inline void omap_dmic_write(struct omap_dmic *dmic, u16 reg, u32 val)
	66	{
1b488a48	67	writel_relaxed(val, dmic->io_base + reg);
fd26f947 PU	68	}
	69
	70	static inline int omap_dmic_read(struct omap_dmic *dmic, u16 reg)
	71	{
1b488a48	72	return readl_relaxed(dmic->io_base + reg);
fd26f947 PU	73	}
	74
	75	static inline void omap_dmic_start(struct omap_dmic *dmic)
	76	{
	77	u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
	78
	79	/* Configure DMA controller */
	80	omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_SET_REG,
	81	OMAP_DMIC_DMA_ENABLE);
	82
	83	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl \| dmic->ch_enabled);
	84	}
	85
	86	static inline void omap_dmic_stop(struct omap_dmic *dmic)
	87	{
	88	u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
	89	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
	90	ctrl & ~OMAP_DMIC_UP_ENABLE_MASK);
	91
	92	/* Disable DMA request generation */
	93	omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_CLR_REG,
	94	OMAP_DMIC_DMA_ENABLE);
	95
	96	}
	97
	98	static inline int dmic_is_enabled(struct omap_dmic *dmic)
	99	{
	100	return omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG) &
	101	OMAP_DMIC_UP_ENABLE_MASK;
	102	}
	103
	104	static int omap_dmic_dai_startup(struct snd_pcm_substream *substream,
	105	struct snd_soc_dai *dai)
	106	{
	107	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	108	int ret = 0;
	109
	110	mutex_lock(&dmic->mutex);
	111
7df6f255	112	if (!dai->active)
fd26f947	113	dmic->active = 1;
7df6f255	114	else
fd26f947	115	ret = -EBUSY;
fd26f947 PU	116
	117	mutex_unlock(&dmic->mutex);
	118
	119	return ret;
	120	}
	121
	122	static void omap_dmic_dai_shutdown(struct snd_pcm_substream *substream,
	123	struct snd_soc_dai *dai)
	124	{
	125	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	126
	127	mutex_lock(&dmic->mutex);
	128
ffdcc363 PU	129	pm_qos_remove_request(&dmic->pm_qos_req);
ffdcc363 PU	130
06d07b6b	131	if (!dai->active)
fd26f947	132	dmic->active = 0;
fd26f947 PU	133
	134	mutex_unlock(&dmic->mutex);
	135	}
	136
	137	static int omap_dmic_select_divider(struct omap_dmic *dmic, int sample_rate)
	138	{
	139	int divider = -EINVAL;
	140
	141	/*
	142	* 192KHz rate is only supported with 19.2MHz/3.84MHz clock
	143	* configuration.
	144	*/
	145	if (sample_rate == 192000) {
	146	if (dmic->fclk_freq == 19200000 && dmic->out_freq == 3840000)
	147	divider = 0x6; /* Divider: 5 (192KHz sampling rate) */
	148	else
	149	dev_err(dmic->dev,
	150	"invalid clock configuration for 192KHz\n");
	151
	152	return divider;
	153	}
	154
	155	switch (dmic->out_freq) {
	156	case 1536000:
	157	if (dmic->fclk_freq != 24576000)
	158	goto div_err;
	159	divider = 0x4; /* Divider: 16 */
	160	break;
	161	case 2400000:
	162	switch (dmic->fclk_freq) {
	163	case 12000000:
	164	divider = 0x5; /* Divider: 5 */
	165	break;
	166	case 19200000:
	167	divider = 0x0; /* Divider: 8 */
	168	break;
	169	case 24000000:
	170	divider = 0x2; /* Divider: 10 */
	171	break;
	172	default:
	173	goto div_err;
	174	}
	175	break;
	176	case 3072000:
	177	if (dmic->fclk_freq != 24576000)
	178	goto div_err;
	179	divider = 0x3; /* Divider: 8 */
	180	break;
	181	case 3840000:
	182	if (dmic->fclk_freq != 19200000)
	183	goto div_err;
	184	divider = 0x1; /* Divider: 5 (96KHz sampling rate) */
	185	break;
	186	default:
	187	dev_err(dmic->dev, "invalid out frequency: %dHz\n",
	188	dmic->out_freq);
	189	break;
	190	}
	191
	192	return divider;
	193
	194	div_err:
	195	dev_err(dmic->dev, "invalid out frequency %dHz for %dHz input\n",
	196	dmic->out_freq, dmic->fclk_freq);
197	return -EINVAL;
198	}
199
200	static int omap_dmic_dai_hw_params(struct snd_pcm_substream *substream,
201	struct snd_pcm_hw_params *params,
202	struct snd_soc_dai *dai)
203	{
204	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
09ae3aaf	205	struct snd_dmaengine_dai_dma_data *dma_data;
fd26f947 PU	206	int channels;
	207
	208	dmic->clk_div = omap_dmic_select_divider(dmic, params_rate(params));
	209	if (dmic->clk_div < 0) {
	210	dev_err(dmic->dev, "no valid divider for %dHz from %dHz\n",
	211	dmic->out_freq, dmic->fclk_freq);
	212	return -EINVAL;
	213	}
	214
	215	dmic->ch_enabled = 0;
	216	channels = params_channels(params);
	217	switch (channels) {
	218	case 6:
	219	dmic->ch_enabled \|= OMAP_DMIC_UP3_ENABLE;
a773c3b6	220	/* fall through */
fd26f947 PU	221	case 4:
fd26f947 PU	222	dmic->ch_enabled \|= OMAP_DMIC_UP2_ENABLE;
a773c3b6	223	/* fall through */
fd26f947 PU	224	case 2:
	225	dmic->ch_enabled \|= OMAP_DMIC_UP1_ENABLE;
	226	break;
	227	default:
	228	dev_err(dmic->dev, "invalid number of legacy channels\n");
	229	return -EINVAL;
	230	}
	231
	232	/* packet size is threshold * channels */
bcd6da7b	233	dma_data = snd_soc_dai_get_dma_data(dai, substream);
09ae3aaf	234	dma_data->maxburst = dmic->threshold * channels;
ffdcc363 PU	235	dmic->latency = (OMAP_DMIC_THRES_MAX - dmic->threshold) * USEC_PER_SEC /
ffdcc363 PU	236	params_rate(params);
fd26f947 PU	237
	238	return 0;
	239	}
	240
	241	static int omap_dmic_dai_prepare(struct snd_pcm_substream *substream,
	242	struct snd_soc_dai *dai)
	243	{
	244	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	245	u32 ctrl;
	246
ffdcc363 PU	247	if (pm_qos_request_active(&dmic->pm_qos_req))
	248	pm_qos_update_request(&dmic->pm_qos_req, dmic->latency);
	249
fd26f947 PU	250	/* Configure uplink threshold */
	251	omap_dmic_write(dmic, OMAP_DMIC_FIFO_CTRL_REG, dmic->threshold);
	252
	253	ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
	254
	255	/* Set dmic out format */
	256	ctrl &= ~(OMAP_DMIC_FORMAT \| OMAP_DMIC_POLAR_MASK);
	257	ctrl \|= (OMAP_DMICOUTFORMAT_LJUST \| OMAP_DMIC_POLAR1 \|
	258	OMAP_DMIC_POLAR2 \| OMAP_DMIC_POLAR3);
	259
	260	/* Configure dmic clock divider */
	261	ctrl &= ~OMAP_DMIC_CLK_DIV_MASK;
	262	ctrl \|= OMAP_DMIC_CLK_DIV(dmic->clk_div);
	263
	264	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl);
	265
	266	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
	267	ctrl \| OMAP_DMICOUTFORMAT_LJUST \| OMAP_DMIC_POLAR1 \|
	268	OMAP_DMIC_POLAR2 \| OMAP_DMIC_POLAR3);
	269
	270	return 0;
	271	}
	272
	273	static int omap_dmic_dai_trigger(struct snd_pcm_substream *substream,
	274	int cmd, struct snd_soc_dai *dai)
	275	{
	276	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	277
	278	switch (cmd) {
	279	case SNDRV_PCM_TRIGGER_START:
	280	omap_dmic_start(dmic);
	281	break;
	282	case SNDRV_PCM_TRIGGER_STOP:
	283	omap_dmic_stop(dmic);
	284	break;
	285	default:
	286	break;
	287	}
	288
	289	return 0;
	290	}
	291
	292	static int omap_dmic_select_fclk(struct omap_dmic *dmic, int clk_id,
	293	unsigned int freq)
	294	{
573eda59	295	struct clk parent_clk, mux;
fd26f947 PU	296	char *parent_clk_name;
	297	int ret = 0;
	298
	299	switch (freq) {
	300	case 12000000:
	301	case 19200000:
	302	case 24000000:
	303	case 24576000:
	304	break;
	305	default:
	306	dev_err(dmic->dev, "invalid input frequency: %dHz\n", freq);
	307	dmic->fclk_freq = 0;
	308	return -EINVAL;
	309	}
	310
	311	if (dmic->sysclk == clk_id) {
	312	dmic->fclk_freq = freq;
	313	return 0;
	314	}
	315
	316	/* re-parent not allowed if a stream is ongoing */
	317	if (dmic->active && dmic_is_enabled(dmic)) {
	318	dev_err(dmic->dev, "can't re-parent when DMIC active\n");
	319	return -EBUSY;
	320	}
	321
	322	switch (clk_id) {
	323	case OMAP_DMIC_SYSCLK_PAD_CLKS:
	324	parent_clk_name = "pad_clks_ck";
	325	break;
	326	case OMAP_DMIC_SYSCLK_SLIMBLUS_CLKS:
	327	parent_clk_name = "slimbus_clk";
	328	break;
	329	case OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS:
	330	parent_clk_name = "dmic_sync_mux_ck";
	331	break;
	332	default:
	333	dev_err(dmic->dev, "fclk clk_id (%d) not supported\n", clk_id);
	334	return -EINVAL;
	335	}
	336
	337	parent_clk = clk_get(dmic->dev, parent_clk_name);
	338	if (IS_ERR(parent_clk)) {
	339	dev_err(dmic->dev, "can't get %s\n", parent_clk_name);
	340	return -ENODEV;
	341	}
	342
573eda59 TK	343	mux = clk_get_parent(dmic->fclk);
	344	if (IS_ERR(mux)) {
	345	dev_err(dmic->dev, "can't get fck mux parent\n");
	346	clk_put(parent_clk);
	347	return -ENODEV;
	348	}
	349
fd26f947 PU	350	mutex_lock(&dmic->mutex);
	351	if (dmic->active) {
	352	/* disable clock while reparenting */
	353	pm_runtime_put_sync(dmic->dev);
573eda59	354	ret = clk_set_parent(mux, parent_clk);
fd26f947 PU	355	pm_runtime_get_sync(dmic->dev);
fd26f947 PU	356	} else {
573eda59	357	ret = clk_set_parent(mux, parent_clk);
fd26f947 PU	358	}
	359	mutex_unlock(&dmic->mutex);
	360
	361	if (ret < 0) {
	362	dev_err(dmic->dev, "re-parent failed\n");
	363	goto err_busy;
	364	}
	365
	366	dmic->sysclk = clk_id;
	367	dmic->fclk_freq = freq;
	368
	369	err_busy:
573eda59	370	clk_put(mux);
fd26f947 PU	371	clk_put(parent_clk);
	372
	373	return ret;
	374	}
	375
	376	static int omap_dmic_select_outclk(struct omap_dmic *dmic, int clk_id,
	377	unsigned int freq)
	378	{
	379	int ret = 0;
	380
	381	if (clk_id != OMAP_DMIC_ABE_DMIC_CLK) {
	382	dev_err(dmic->dev, "output clk_id (%d) not supported\n",
	383	clk_id);
	384	return -EINVAL;
	385	}
	386
	387	switch (freq) {
	388	case 1536000:
	389	case 2400000:
	390	case 3072000:
	391	case 3840000:
	392	dmic->out_freq = freq;
	393	break;
	394	default:
	395	dev_err(dmic->dev, "invalid out frequency: %dHz\n", freq);
	396	dmic->out_freq = 0;
	397	ret = -EINVAL;
	398	}
	399
	400	return ret;
	401	}
	402
	403	static int omap_dmic_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
	404	unsigned int freq, int dir)
	405	{
	406	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	407
	408	if (dir == SND_SOC_CLOCK_IN)
	409	return omap_dmic_select_fclk(dmic, clk_id, freq);
	410	else if (dir == SND_SOC_CLOCK_OUT)
	411	return omap_dmic_select_outclk(dmic, clk_id, freq);
	412
	413	dev_err(dmic->dev, "invalid clock direction (%d)\n", dir);
	414	return -EINVAL;
	415	}
	416
	417	static const struct snd_soc_dai_ops omap_dmic_dai_ops = {
	418	.startup = omap_dmic_dai_startup,
	419	.shutdown = omap_dmic_dai_shutdown,
	420	.hw_params = omap_dmic_dai_hw_params,
	421	.prepare = omap_dmic_dai_prepare,
	422	.trigger = omap_dmic_dai_trigger,
	423	.set_sysclk = omap_dmic_set_dai_sysclk,
	424	};
	425
	426	static int omap_dmic_probe(struct snd_soc_dai *dai)
	427	{
	428	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	429
	430	pm_runtime_enable(dmic->dev);
	431
	432	/* Disable lines while request is ongoing */
	433	pm_runtime_get_sync(dmic->dev);
	434	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, 0x00);
435	pm_runtime_put_sync(dmic->dev);
436
437	/* Configure DMIC threshold value */
438	dmic->threshold = OMAP_DMIC_THRES_MAX - 3;
3802a259 PU	439
	440	snd_soc_dai_init_dma_data(dai, NULL, &dmic->dma_data);
	441
fd26f947 PU	442	return 0;
	443	}
	444
	445	static int omap_dmic_remove(struct snd_soc_dai *dai)
	446	{
	447	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	448
	449	pm_runtime_disable(dmic->dev);
	450
	451	return 0;
	452	}
	453
	454	static struct snd_soc_dai_driver omap_dmic_dai = {
	455	.name = "omap-dmic",
	456	.probe = omap_dmic_probe,
	457	.remove = omap_dmic_remove,
	458	.capture = {
	459	.channels_min = 2,
	460	.channels_max = 6,
	461	.rates = SNDRV_PCM_RATE_96000 \| SNDRV_PCM_RATE_192000,
	462	.formats = SNDRV_PCM_FMTBIT_S32_LE,
7df6f255	463	.sig_bits = 24,
fd26f947 PU	464	},
	465	.ops = &omap_dmic_dai_ops,
	466	};
	467
ed22853a KM	468	static const struct snd_soc_component_driver omap_dmic_component = {
	469	.name = "omap-dmic",
	470	};
	471
7ff60006	472	static int asoc_dmic_probe(struct platform_device *pdev)
fd26f947 PU	473	{
	474	struct omap_dmic *dmic;
	475	struct resource *res;
	476	int ret;
	477
	478	dmic = devm_kzalloc(&pdev->dev, sizeof(struct omap_dmic), GFP_KERNEL);
	479	if (!dmic)
	480	return -ENOMEM;
	481
	482	platform_set_drvdata(pdev, dmic);
	483	dmic->dev = &pdev->dev;
	484	dmic->sysclk = OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS;
	485
	486	mutex_init(&dmic->mutex);
	487
9cb0fe9b	488	dmic->fclk = devm_clk_get(dmic->dev, "fck");
fd26f947	489	if (IS_ERR(dmic->fclk)) {
19118eb8	490	dev_err(dmic->dev, "cant get fck\n");
fd26f947 PU	491	return -ENODEV;
	492	}
	493
	494	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
	495	if (!res) {
	496	dev_err(dmic->dev, "invalid dma memory resource\n");
9cb0fe9b	497	return -ENODEV;
fd26f947	498	}
09ae3aaf	499	dmic->dma_data.addr = res->start + OMAP_DMIC_DATA_REG;
fd26f947	500
2ebef447	501	dmic->dma_data.filter_data = "up_link";
fd26f947 PU	502
fd26f947 PU	503	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
673c24e9	504	dmic->io_base = devm_ioremap_resource(&pdev->dev, res);
9cb0fe9b HS	505	if (IS_ERR(dmic->io_base))
9cb0fe9b HS	506	return PTR_ERR(dmic->io_base);
fd26f947	507
fd26f947	508
159baadf MB	509	ret = devm_snd_soc_register_component(&pdev->dev,
	510	&omap_dmic_component,
	511	&omap_dmic_dai, 1);
fd26f947	512	if (ret)
9cb0fe9b	513	return ret;
fd26f947	514
87dbec53	515	ret = sdma_pcm_platform_register(&pdev->dev, NULL, "up_link");
18d7cfea	516	if (ret)
9cb0fe9b	517	return ret;
fd26f947 PU	518
	519	return 0;
	520	}
	521
2ec1be37 PU	522	static const struct of_device_id omap_dmic_of_match[] = {
	523	{ .compatible = "ti,omap4-dmic", },
	524	{ }
	525	};
	526	MODULE_DEVICE_TABLE(of, omap_dmic_of_match);
	527
fd26f947 PU	528	static struct platform_driver asoc_dmic_driver = {
	529	.driver = {
	530	.name = "omap-dmic",
2ec1be37	531	.of_match_table = omap_dmic_of_match,
fd26f947 PU	532	},
fd26f947 PU	533	.probe = asoc_dmic_probe,
fd26f947 PU	534	};
	535
	536	module_platform_driver(asoc_dmic_driver);
	537
	538	MODULE_ALIAS("platform:omap-dmic");
	539	MODULE_AUTHOR("Peter Ujfalusi <[email protected]>");
	540	MODULE_DESCRIPTION("OMAP DMIC ASoC Interface");
	541	MODULE_LICENSE("GPL");