[deliverable/linux.git] / sound / soc / tegra / tegra20_i2s.c

/*
 * tegra20_i2s.c - Tegra20 I2S driver
 *
 * Author: Stephen Warren <swarren@nvidia.com>
 * Copyright (C) 2010,2012 - NVIDIA, Inc.
 *
 * Based on code copyright/by:
 *
 * Copyright (c) 2009-2010, NVIDIA Corporation.
 * Scott Peterson <speterson@nvidia.com>
 *
 * Copyright (C) 2010 Google, Inc.
 * Iliyan Malchev <malchev@google.com>
 *
 * 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/clk.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.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 "tegra20_i2s.h"

#define DRV_NAME "tegra20-i2s"

static int tegra20_i2s_runtime_suspend(struct device *dev)
{
	struct tegra20_i2s *i2s = dev_get_drvdata(dev);

	clk_disable_unprepare(i2s->clk_i2s);

	return 0;
}

static int tegra20_i2s_runtime_resume(struct device *dev)
{
	struct tegra20_i2s *i2s = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(i2s->clk_i2s);
	if (ret) {
		dev_err(dev, "clk_enable failed: %d\n", ret);
		return ret;
	}

	return 0;
}

static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
				unsigned int fmt)
{
	struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	unsigned int mask, val;

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		break;
	default:
		return -EINVAL;
	}

	mask = TEGRA20_I2S_CTRL_MASTER_ENABLE;
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBS_CFS:
		val = TEGRA20_I2S_CTRL_MASTER_ENABLE;
		break;
	case SND_SOC_DAIFMT_CBM_CFM:
		break;
	default:
		return -EINVAL;
	}

	mask |= TEGRA20_I2S_CTRL_BIT_FORMAT_MASK |
		TEGRA20_I2S_CTRL_LRCK_MASK;
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_DSP_A:
		val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
		val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		val |= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
		val |= TEGRA20_I2S_CTRL_LRCK_R_LOW;
		break;
	case SND_SOC_DAIFMT_I2S:
		val |= TEGRA20_I2S_CTRL_BIT_FORMAT_I2S;
		val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		val |= TEGRA20_I2S_CTRL_BIT_FORMAT_RJM;
		val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		val |= TEGRA20_I2S_CTRL_BIT_FORMAT_LJM;
		val |= TEGRA20_I2S_CTRL_LRCK_L_LOW;
		break;
	default:
		return -EINVAL;
	}

	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);

	return 0;
}

static int tegra20_i2s_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *dai)
{
	struct device *dev = dai->dev;
	struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	unsigned int mask, val;
	int ret, sample_size, srate, i2sclock, bitcnt;

	mask = TEGRA20_I2S_CTRL_BIT_SIZE_MASK;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		val = TEGRA20_I2S_CTRL_BIT_SIZE_16;
		sample_size = 16;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		val = TEGRA20_I2S_CTRL_BIT_SIZE_24;
		sample_size = 24;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		val = TEGRA20_I2S_CTRL_BIT_SIZE_32;
		sample_size = 32;
		break;
	default:
		return -EINVAL;
	}

	mask |= TEGRA20_I2S_CTRL_FIFO_FORMAT_MASK;
	val |= TEGRA20_I2S_CTRL_FIFO_FORMAT_PACKED;

	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);

	srate = params_rate(params);

	/* Final "* 2" required by Tegra hardware */
	i2sclock = srate * params_channels(params) * sample_size * 2;

	ret = clk_set_rate(i2s->clk_i2s, i2sclock);
	if (ret) {
		dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
		return ret;
	}

	bitcnt = (i2sclock / (2 * srate)) - 1;
	if (bitcnt < 0 || bitcnt > TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
		return -EINVAL;
	val = bitcnt << TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;

	if (i2sclock % (2 * srate))
		val |= TEGRA20_I2S_TIMING_NON_SYM_ENABLE;

	regmap_write(i2s->regmap, TEGRA20_I2S_TIMING, val);

	regmap_write(i2s->regmap, TEGRA20_I2S_FIFO_SCR,
		     TEGRA20_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS |
		     TEGRA20_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);

	return 0;
}

static void tegra20_i2s_start_playback(struct tegra20_i2s *i2s)
{
	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
			   TEGRA20_I2S_CTRL_FIFO1_ENABLE,
			   TEGRA20_I2S_CTRL_FIFO1_ENABLE);
}

static void tegra20_i2s_stop_playback(struct tegra20_i2s *i2s)
{
	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
			   TEGRA20_I2S_CTRL_FIFO1_ENABLE, 0);
}

static void tegra20_i2s_start_capture(struct tegra20_i2s *i2s)
{
	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
			   TEGRA20_I2S_CTRL_FIFO2_ENABLE,
			   TEGRA20_I2S_CTRL_FIFO2_ENABLE);
}

static void tegra20_i2s_stop_capture(struct tegra20_i2s *i2s)
{
	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
			   TEGRA20_I2S_CTRL_FIFO2_ENABLE, 0);
}

static int tegra20_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
			       struct snd_soc_dai *dai)
{
	struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	case SNDRV_PCM_TRIGGER_RESUME:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			tegra20_i2s_start_playback(i2s);
		else
			tegra20_i2s_start_capture(i2s);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
			tegra20_i2s_stop_playback(i2s);
		else
			tegra20_i2s_stop_capture(i2s);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int tegra20_i2s_probe(struct snd_soc_dai *dai)
{
	struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);

	dai->capture_dma_data = &i2s->capture_dma_data;
	dai->playback_dma_data = &i2s->playback_dma_data;

	return 0;
}

static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
	.set_fmt	= tegra20_i2s_set_fmt,
	.hw_params	= tegra20_i2s_hw_params,
	.trigger	= tegra20_i2s_trigger,
};

static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
	.probe = tegra20_i2s_probe,
	.playback = {
		.stream_name = "Playback",
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_96000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_96000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
	},
	.ops = &tegra20_i2s_dai_ops,
	.symmetric_rates = 1,
};

static bool tegra20_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TEGRA20_I2S_CTRL:
	case TEGRA20_I2S_STATUS:
	case TEGRA20_I2S_TIMING:
	case TEGRA20_I2S_FIFO_SCR:
	case TEGRA20_I2S_PCM_CTRL:
	case TEGRA20_I2S_NW_CTRL:
	case TEGRA20_I2S_TDM_CTRL:
	case TEGRA20_I2S_TDM_TX_RX_CTRL:
	case TEGRA20_I2S_FIFO1:
	case TEGRA20_I2S_FIFO2:
		return true;
	default:
		return false;
	};
}

static bool tegra20_i2s_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TEGRA20_I2S_STATUS:
	case TEGRA20_I2S_FIFO_SCR:
	case TEGRA20_I2S_FIFO1:
	case TEGRA20_I2S_FIFO2:
		return true;
	default:
		return false;
	};
}

static bool tegra20_i2s_precious_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case TEGRA20_I2S_FIFO1:
	case TEGRA20_I2S_FIFO2:
		return true;
	default:
		return false;
	};
}

static const struct regmap_config tegra20_i2s_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.max_register = TEGRA20_I2S_FIFO2,
	.writeable_reg = tegra20_i2s_wr_rd_reg,
	.readable_reg = tegra20_i2s_wr_rd_reg,
	.volatile_reg = tegra20_i2s_volatile_reg,
	.precious_reg = tegra20_i2s_precious_reg,
	.cache_type = REGCACHE_RBTREE,
};

static int tegra20_i2s_platform_probe(struct platform_device *pdev)
{
	struct tegra20_i2s *i2s;
	struct resource *mem, *memregion, *dmareq;
	u32 of_dma[2];
	u32 dma_ch;
	void __iomem *regs;
	int ret;

	i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
	if (!i2s) {
		dev_err(&pdev->dev, "Can't allocate tegra20_i2s\n");
		ret = -ENOMEM;
		goto err;
	}
	dev_set_drvdata(&pdev->dev, i2s);

	i2s->dai = tegra20_i2s_dai_template;
	i2s->dai.name = dev_name(&pdev->dev);

	i2s->clk_i2s = clk_get(&pdev->dev, NULL);
	if (IS_ERR(i2s->clk_i2s)) {
		dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
		ret = PTR_ERR(i2s->clk_i2s);
		goto err;
	}

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem) {
		dev_err(&pdev->dev, "No memory resource\n");
		ret = -ENODEV;
		goto err_clk_put;
	}

	dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!dmareq) {
		if (of_property_read_u32_array(pdev->dev.of_node,
					"nvidia,dma-request-selector",
					of_dma, 2) < 0) {
			dev_err(&pdev->dev, "No DMA resource\n");
			ret = -ENODEV;
			goto err_clk_put;
		}
		dma_ch = of_dma[1];
	} else {
		dma_ch = dmareq->start;
	}

	memregion = devm_request_mem_region(&pdev->dev, mem->start,
					    resource_size(mem), DRV_NAME);
	if (!memregion) {
		dev_err(&pdev->dev, "Memory region already claimed\n");
		ret = -EBUSY;
		goto err_clk_put;
	}

	regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
	if (!regs) {
		dev_err(&pdev->dev, "ioremap failed\n");
		ret = -ENOMEM;
		goto err_clk_put;
	}

	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
					    &tegra20_i2s_regmap_config);
	if (IS_ERR(i2s->regmap)) {
		dev_err(&pdev->dev, "regmap init failed\n");
		ret = PTR_ERR(i2s->regmap);
		goto err_clk_put;
	}

	i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
	i2s->capture_dma_data.wrap = 4;
	i2s->capture_dma_data.width = 32;
	i2s->capture_dma_data.req_sel = dma_ch;

	i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
	i2s->playback_dma_data.wrap = 4;
	i2s->playback_dma_data.width = 32;
	i2s->playback_dma_data.req_sel = dma_ch;

	pm_runtime_enable(&pdev->dev);
	if (!pm_runtime_enabled(&pdev->dev)) {
		ret = tegra20_i2s_runtime_resume(&pdev->dev);
		if (ret)
			goto err_pm_disable;
	}

	ret = snd_soc_register_dai(&pdev->dev, &i2s->dai);
	if (ret) {
		dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
		ret = -ENOMEM;
		goto err_suspend;
	}

	ret = tegra_pcm_platform_register(&pdev->dev);
	if (ret) {
		dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
		goto err_unregister_dai;
	}

	return 0;

err_unregister_dai:
	snd_soc_unregister_dai(&pdev->dev);
err_suspend:
	if (!pm_runtime_status_suspended(&pdev->dev))
		tegra20_i2s_runtime_suspend(&pdev->dev);
err_pm_disable:
	pm_runtime_disable(&pdev->dev);
err_clk_put:
	clk_put(i2s->clk_i2s);
err:
	return ret;
}

static int tegra20_i2s_platform_remove(struct platform_device *pdev)
{
	struct tegra20_i2s *i2s = dev_get_drvdata(&pdev->dev);

	pm_runtime_disable(&pdev->dev);
	if (!pm_runtime_status_suspended(&pdev->dev))
		tegra20_i2s_runtime_suspend(&pdev->dev);

	tegra_pcm_platform_unregister(&pdev->dev);
	snd_soc_unregister_dai(&pdev->dev);

	clk_put(i2s->clk_i2s);

	return 0;
}

static const struct of_device_id tegra20_i2s_of_match[] = {
	{ .compatible = "nvidia,tegra20-i2s", },
	{},
};

static const struct dev_pm_ops tegra20_i2s_pm_ops = {
	SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
			   tegra20_i2s_runtime_resume, NULL)
};

static struct platform_driver tegra20_i2s_driver = {
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
		.of_match_table = tegra20_i2s_of_match,
		.pm = &tegra20_i2s_pm_ops,
	},
	.probe = tegra20_i2s_platform_probe,
	.remove = tegra20_i2s_platform_remove,
};
module_platform_driver(tegra20_i2s_driver);

MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);
Commit	Line	Data
	1	/*
	2	* tegra20_i2s.c - Tegra20 I2S driver
	3	*
	4	* Author: Stephen Warren <swarren@nvidia.com>
	5	* Copyright (C) 2010,2012 - NVIDIA, Inc.
	6	*
	7	* Based on code copyright/by:
	8	*
	9	* Copyright (c) 2009-2010, NVIDIA Corporation.
	10	* Scott Peterson <speterson@nvidia.com>
	11	*
	12	* Copyright (C) 2010 Google, Inc.
	13	* Iliyan Malchev <malchev@google.com>
	14	*
	15	* This program is free software; you can redistribute it and/or
	16	* modify it under the terms of the GNU General Public License
	17	* version 2 as published by the Free Software Foundation.
	18	*
	19	* This program is distributed in the hope that it will be useful, but
	20	* WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	22	* General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, write to the Free Software
	26	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	27	* 02110-1301 USA
	28	*
	29	*/
	30
	31	#include <linux/clk.h>
	32	#include <linux/device.h>
	33	#include <linux/io.h>
	34	#include <linux/module.h>
	35	#include <linux/of.h>
	36	#include <linux/platform_device.h>
	37	#include <linux/pm_runtime.h>
	38	#include <linux/regmap.h>
	39	#include <linux/slab.h>
	40	#include <sound/core.h>
	41	#include <sound/pcm.h>
	42	#include <sound/pcm_params.h>
	43	#include <sound/soc.h>
	44
	45	#include "tegra20_i2s.h"
	46
	47	#define DRV_NAME "tegra20-i2s"
	48
	49	static int tegra20_i2s_runtime_suspend(struct device *dev)
	50	{
	51	struct tegra20_i2s *i2s = dev_get_drvdata(dev);
	52
	53	clk_disable_unprepare(i2s->clk_i2s);
	54
	55	return 0;
	56	}
	57
	58	static int tegra20_i2s_runtime_resume(struct device *dev)
	59	{
	60	struct tegra20_i2s *i2s = dev_get_drvdata(dev);
	61	int ret;
	62
	63	ret = clk_prepare_enable(i2s->clk_i2s);
	64	if (ret) {
	65	dev_err(dev, "clk_enable failed: %d\n", ret);
	66	return ret;
	67	}
	68
	69	return 0;
	70	}
	71
	72	static int tegra20_i2s_set_fmt(struct snd_soc_dai *dai,
	73	unsigned int fmt)
	74	{
	75	struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	76	unsigned int mask, val;
	77
	78	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	79	case SND_SOC_DAIFMT_NB_NF:
	80	break;
	81	default:
	82	return -EINVAL;
	83	}
	84
	85	mask = TEGRA20_I2S_CTRL_MASTER_ENABLE;
	86	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	87	case SND_SOC_DAIFMT_CBS_CFS:
	88	val = TEGRA20_I2S_CTRL_MASTER_ENABLE;
	89	break;
	90	case SND_SOC_DAIFMT_CBM_CFM:
	91	break;
	92	default:
	93	return -EINVAL;
	94	}
	95
	96	mask \|= TEGRA20_I2S_CTRL_BIT_FORMAT_MASK \|
	97	TEGRA20_I2S_CTRL_LRCK_MASK;
	98	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	99	case SND_SOC_DAIFMT_DSP_A:
	100	val \|= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
	101	val \|= TEGRA20_I2S_CTRL_LRCK_L_LOW;
	102	break;
	103	case SND_SOC_DAIFMT_DSP_B:
	104	val \|= TEGRA20_I2S_CTRL_BIT_FORMAT_DSP;
	105	val \|= TEGRA20_I2S_CTRL_LRCK_R_LOW;
	106	break;
	107	case SND_SOC_DAIFMT_I2S:
	108	val \|= TEGRA20_I2S_CTRL_BIT_FORMAT_I2S;
	109	val \|= TEGRA20_I2S_CTRL_LRCK_L_LOW;
	110	break;
	111	case SND_SOC_DAIFMT_RIGHT_J:
	112	val \|= TEGRA20_I2S_CTRL_BIT_FORMAT_RJM;
	113	val \|= TEGRA20_I2S_CTRL_LRCK_L_LOW;
	114	break;
	115	case SND_SOC_DAIFMT_LEFT_J:
	116	val \|= TEGRA20_I2S_CTRL_BIT_FORMAT_LJM;
	117	val \|= TEGRA20_I2S_CTRL_LRCK_L_LOW;
	118	break;
	119	default:
	120	return -EINVAL;
	121	}
	122
	123	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
	124
	125	return 0;
	126	}
	127
	128	static int tegra20_i2s_hw_params(struct snd_pcm_substream *substream,
	129	struct snd_pcm_hw_params *params,
	130	struct snd_soc_dai *dai)
	131	{
	132	struct device *dev = dai->dev;
	133	struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	134	unsigned int mask, val;
	135	int ret, sample_size, srate, i2sclock, bitcnt;
	136
	137	mask = TEGRA20_I2S_CTRL_BIT_SIZE_MASK;
	138	switch (params_format(params)) {
	139	case SNDRV_PCM_FORMAT_S16_LE:
	140	val = TEGRA20_I2S_CTRL_BIT_SIZE_16;
	141	sample_size = 16;
	142	break;
	143	case SNDRV_PCM_FORMAT_S24_LE:
	144	val = TEGRA20_I2S_CTRL_BIT_SIZE_24;
	145	sample_size = 24;
	146	break;
	147	case SNDRV_PCM_FORMAT_S32_LE:
	148	val = TEGRA20_I2S_CTRL_BIT_SIZE_32;
	149	sample_size = 32;
	150	break;
	151	default:
	152	return -EINVAL;
	153	}
	154
	155	mask \|= TEGRA20_I2S_CTRL_FIFO_FORMAT_MASK;
	156	val \|= TEGRA20_I2S_CTRL_FIFO_FORMAT_PACKED;
	157
	158	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL, mask, val);
	159
	160	srate = params_rate(params);
	161
	162	/* Final "* 2" required by Tegra hardware */
	163	i2sclock = srate * params_channels(params) * sample_size * 2;
	164
	165	ret = clk_set_rate(i2s->clk_i2s, i2sclock);
	166	if (ret) {
	167	dev_err(dev, "Can't set I2S clock rate: %d\n", ret);
	168	return ret;
	169	}
	170
	171	bitcnt = (i2sclock / (2 * srate)) - 1;
	172	if (bitcnt < 0 \|\| bitcnt > TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_MASK_US)
	173	return -EINVAL;
	174	val = bitcnt << TEGRA20_I2S_TIMING_CHANNEL_BIT_COUNT_SHIFT;
	175
	176	if (i2sclock % (2 * srate))
	177	val \|= TEGRA20_I2S_TIMING_NON_SYM_ENABLE;
	178
	179	regmap_write(i2s->regmap, TEGRA20_I2S_TIMING, val);
	180
	181	regmap_write(i2s->regmap, TEGRA20_I2S_FIFO_SCR,
	182	TEGRA20_I2S_FIFO_SCR_FIFO2_ATN_LVL_FOUR_SLOTS \|
	183	TEGRA20_I2S_FIFO_SCR_FIFO1_ATN_LVL_FOUR_SLOTS);
	184
	185	return 0;
	186	}
	187
	188	static void tegra20_i2s_start_playback(struct tegra20_i2s *i2s)
	189	{
	190	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
	191	TEGRA20_I2S_CTRL_FIFO1_ENABLE,
	192	TEGRA20_I2S_CTRL_FIFO1_ENABLE);
	193	}
	194
	195	static void tegra20_i2s_stop_playback(struct tegra20_i2s *i2s)
	196	{
	197	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
	198	TEGRA20_I2S_CTRL_FIFO1_ENABLE, 0);
	199	}
	200
	201	static void tegra20_i2s_start_capture(struct tegra20_i2s *i2s)
	202	{
	203	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
	204	TEGRA20_I2S_CTRL_FIFO2_ENABLE,
	205	TEGRA20_I2S_CTRL_FIFO2_ENABLE);
	206	}
	207
	208	static void tegra20_i2s_stop_capture(struct tegra20_i2s *i2s)
	209	{
	210	regmap_update_bits(i2s->regmap, TEGRA20_I2S_CTRL,
	211	TEGRA20_I2S_CTRL_FIFO2_ENABLE, 0);
	212	}
	213
	214	static int tegra20_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
	215	struct snd_soc_dai *dai)
	216	{
	217	struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	218
	219	switch (cmd) {
	220	case SNDRV_PCM_TRIGGER_START:
	221	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	222	case SNDRV_PCM_TRIGGER_RESUME:
	223	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	224	tegra20_i2s_start_playback(i2s);
	225	else
	226	tegra20_i2s_start_capture(i2s);
	227	break;
	228	case SNDRV_PCM_TRIGGER_STOP:
	229	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	230	case SNDRV_PCM_TRIGGER_SUSPEND:
	231	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	232	tegra20_i2s_stop_playback(i2s);
	233	else
	234	tegra20_i2s_stop_capture(i2s);
	235	break;
	236	default:
	237	return -EINVAL;
	238	}
	239
	240	return 0;
	241	}
	242
	243	static int tegra20_i2s_probe(struct snd_soc_dai *dai)
	244	{
	245	struct tegra20_i2s *i2s = snd_soc_dai_get_drvdata(dai);
	246
	247	dai->capture_dma_data = &i2s->capture_dma_data;
	248	dai->playback_dma_data = &i2s->playback_dma_data;
	249
	250	return 0;
	251	}
	252
	253	static const struct snd_soc_dai_ops tegra20_i2s_dai_ops = {
	254	.set_fmt = tegra20_i2s_set_fmt,
	255	.hw_params = tegra20_i2s_hw_params,
	256	.trigger = tegra20_i2s_trigger,
	257	};
	258
	259	static const struct snd_soc_dai_driver tegra20_i2s_dai_template = {
	260	.probe = tegra20_i2s_probe,
	261	.playback = {
	262	.stream_name = "Playback",
	263	.channels_min = 2,
	264	.channels_max = 2,
	265	.rates = SNDRV_PCM_RATE_8000_96000,
	266	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	267	},
	268	.capture = {
	269	.stream_name = "Capture",
	270	.channels_min = 2,
	271	.channels_max = 2,
	272	.rates = SNDRV_PCM_RATE_8000_96000,
	273	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	274	},
	275	.ops = &tegra20_i2s_dai_ops,
	276	.symmetric_rates = 1,
	277	};
	278
	279	static bool tegra20_i2s_wr_rd_reg(struct device *dev, unsigned int reg)
	280	{
	281	switch (reg) {
	282	case TEGRA20_I2S_CTRL:
	283	case TEGRA20_I2S_STATUS:
	284	case TEGRA20_I2S_TIMING:
	285	case TEGRA20_I2S_FIFO_SCR:
	286	case TEGRA20_I2S_PCM_CTRL:
	287	case TEGRA20_I2S_NW_CTRL:
	288	case TEGRA20_I2S_TDM_CTRL:
	289	case TEGRA20_I2S_TDM_TX_RX_CTRL:
	290	case TEGRA20_I2S_FIFO1:
	291	case TEGRA20_I2S_FIFO2:
	292	return true;
	293	default:
	294	return false;
	295	};
	296	}
	297
	298	static bool tegra20_i2s_volatile_reg(struct device *dev, unsigned int reg)
	299	{
	300	switch (reg) {
	301	case TEGRA20_I2S_STATUS:
	302	case TEGRA20_I2S_FIFO_SCR:
	303	case TEGRA20_I2S_FIFO1:
	304	case TEGRA20_I2S_FIFO2:
	305	return true;
	306	default:
	307	return false;
	308	};
	309	}
	310
	311	static bool tegra20_i2s_precious_reg(struct device *dev, unsigned int reg)
	312	{
	313	switch (reg) {
	314	case TEGRA20_I2S_FIFO1:
	315	case TEGRA20_I2S_FIFO2:
	316	return true;
	317	default:
	318	return false;
	319	};
	320	}
	321
	322	static const struct regmap_config tegra20_i2s_regmap_config = {
	323	.reg_bits = 32,
	324	.reg_stride = 4,
	325	.val_bits = 32,
	326	.max_register = TEGRA20_I2S_FIFO2,
	327	.writeable_reg = tegra20_i2s_wr_rd_reg,
	328	.readable_reg = tegra20_i2s_wr_rd_reg,
	329	.volatile_reg = tegra20_i2s_volatile_reg,
	330	.precious_reg = tegra20_i2s_precious_reg,
	331	.cache_type = REGCACHE_RBTREE,
	332	};
	333
	334	static int tegra20_i2s_platform_probe(struct platform_device *pdev)
	335	{
	336	struct tegra20_i2s *i2s;
	337	struct resource mem, memregion, *dmareq;
	338	u32 of_dma[2];
	339	u32 dma_ch;
	340	void __iomem *regs;
	341	int ret;
	342
	343	i2s = devm_kzalloc(&pdev->dev, sizeof(struct tegra20_i2s), GFP_KERNEL);
	344	if (!i2s) {
	345	dev_err(&pdev->dev, "Can't allocate tegra20_i2s\n");
	346	ret = -ENOMEM;
	347	goto err;
	348	}
	349	dev_set_drvdata(&pdev->dev, i2s);
	350
	351	i2s->dai = tegra20_i2s_dai_template;
	352	i2s->dai.name = dev_name(&pdev->dev);
	353
	354	i2s->clk_i2s = clk_get(&pdev->dev, NULL);
	355	if (IS_ERR(i2s->clk_i2s)) {
	356	dev_err(&pdev->dev, "Can't retrieve i2s clock\n");
	357	ret = PTR_ERR(i2s->clk_i2s);
	358	goto err;
	359	}
	360
	361	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	362	if (!mem) {
	363	dev_err(&pdev->dev, "No memory resource\n");
	364	ret = -ENODEV;
	365	goto err_clk_put;
	366	}
	367
	368	dmareq = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	369	if (!dmareq) {
	370	if (of_property_read_u32_array(pdev->dev.of_node,
	371	"nvidia,dma-request-selector",
	372	of_dma, 2) < 0) {
	373	dev_err(&pdev->dev, "No DMA resource\n");
	374	ret = -ENODEV;
	375	goto err_clk_put;
	376	}
	377	dma_ch = of_dma[1];
	378	} else {
	379	dma_ch = dmareq->start;
	380	}
	381
	382	memregion = devm_request_mem_region(&pdev->dev, mem->start,
	383	resource_size(mem), DRV_NAME);
	384	if (!memregion) {
	385	dev_err(&pdev->dev, "Memory region already claimed\n");
	386	ret = -EBUSY;
	387	goto err_clk_put;
	388	}
	389
	390	regs = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
	391	if (!regs) {
	392	dev_err(&pdev->dev, "ioremap failed\n");
	393	ret = -ENOMEM;
	394	goto err_clk_put;
	395	}
	396
	397	i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
	398	&tegra20_i2s_regmap_config);
	399	if (IS_ERR(i2s->regmap)) {
	400	dev_err(&pdev->dev, "regmap init failed\n");
	401	ret = PTR_ERR(i2s->regmap);
	402	goto err_clk_put;
	403	}
	404
	405	i2s->capture_dma_data.addr = mem->start + TEGRA20_I2S_FIFO2;
	406	i2s->capture_dma_data.wrap = 4;
	407	i2s->capture_dma_data.width = 32;
	408	i2s->capture_dma_data.req_sel = dma_ch;
	409
	410	i2s->playback_dma_data.addr = mem->start + TEGRA20_I2S_FIFO1;
	411	i2s->playback_dma_data.wrap = 4;
	412	i2s->playback_dma_data.width = 32;
	413	i2s->playback_dma_data.req_sel = dma_ch;
	414
	415	pm_runtime_enable(&pdev->dev);
	416	if (!pm_runtime_enabled(&pdev->dev)) {
	417	ret = tegra20_i2s_runtime_resume(&pdev->dev);
	418	if (ret)
	419	goto err_pm_disable;
	420	}
	421
	422	ret = snd_soc_register_dai(&pdev->dev, &i2s->dai);
	423	if (ret) {
	424	dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
	425	ret = -ENOMEM;
	426	goto err_suspend;
	427	}
	428
	429	ret = tegra_pcm_platform_register(&pdev->dev);
	430	if (ret) {
	431	dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
	432	goto err_unregister_dai;
	433	}
	434
	435	return 0;
	436
	437	err_unregister_dai:
	438	snd_soc_unregister_dai(&pdev->dev);
	439	err_suspend:
	440	if (!pm_runtime_status_suspended(&pdev->dev))
	441	tegra20_i2s_runtime_suspend(&pdev->dev);
	442	err_pm_disable:
	443	pm_runtime_disable(&pdev->dev);
	444	err_clk_put:
	445	clk_put(i2s->clk_i2s);
	446	err:
	447	return ret;
	448	}
	449
	450	static int tegra20_i2s_platform_remove(struct platform_device *pdev)
	451	{
	452	struct tegra20_i2s *i2s = dev_get_drvdata(&pdev->dev);
	453
	454	pm_runtime_disable(&pdev->dev);
	455	if (!pm_runtime_status_suspended(&pdev->dev))
	456	tegra20_i2s_runtime_suspend(&pdev->dev);
	457
	458	tegra_pcm_platform_unregister(&pdev->dev);
	459	snd_soc_unregister_dai(&pdev->dev);
	460
	461	clk_put(i2s->clk_i2s);
	462
	463	return 0;
	464	}
	465
	466	static const struct of_device_id tegra20_i2s_of_match[] = {
	467	{ .compatible = "nvidia,tegra20-i2s", },
	468	{},
	469	};
	470
	471	static const struct dev_pm_ops tegra20_i2s_pm_ops = {
	472	SET_RUNTIME_PM_OPS(tegra20_i2s_runtime_suspend,
	473	tegra20_i2s_runtime_resume, NULL)
	474	};
	475
	476	static struct platform_driver tegra20_i2s_driver = {
	477	.driver = {
	478	.name = DRV_NAME,
	479	.owner = THIS_MODULE,
	480	.of_match_table = tegra20_i2s_of_match,
	481	.pm = &tegra20_i2s_pm_ops,
	482	},
	483	.probe = tegra20_i2s_platform_probe,
	484	.remove = tegra20_i2s_platform_remove,
	485	};
	486	module_platform_driver(tegra20_i2s_driver);
	487
	488	MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>");
	489	MODULE_DESCRIPTION("Tegra20 I2S ASoC driver");
	490	MODULE_LICENSE("GPL");
	491	MODULE_ALIAS("platform:" DRV_NAME);
	492	MODULE_DEVICE_TABLE(of, tegra20_i2s_of_match);