[deliverable/linux.git] / sound / soc / kirkwood / kirkwood-i2s.c

/*
 * kirkwood-i2s.c
 *
 * (c) 2010 Arnaud Patard <apatard@mandriva.com>
 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/mbus.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/platform_data/asoc-kirkwood.h>
#include "kirkwood.h"

#define DRV_NAME	"kirkwood-i2s"

#define KIRKWOOD_I2S_FORMATS \
	(SNDRV_PCM_FMTBIT_S16_LE | \
	 SNDRV_PCM_FMTBIT_S24_LE | \
	 SNDRV_PCM_FMTBIT_S32_LE)

static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
		unsigned int fmt)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
	unsigned long mask;
	unsigned long value;

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_RIGHT_J:
		mask = KIRKWOOD_I2S_CTL_RJ;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		mask = KIRKWOOD_I2S_CTL_LJ;
		break;
	case SND_SOC_DAIFMT_I2S:
		mask = KIRKWOOD_I2S_CTL_I2S;
		break;
	default:
		return -EINVAL;
	}

	/*
	 * Set same format for playback and record
	 * This avoids some troubles.
	 */
	value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
	value |= mask;
	writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);

	value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
	value |= mask;
	writel(value, priv->io+KIRKWOOD_I2S_RECCTL);

	return 0;
}

static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
{
	unsigned long value;

	value = KIRKWOOD_DCO_CTL_OFFSET_0;
	switch (rate) {
	default:
	case 44100:
		value |= KIRKWOOD_DCO_CTL_FREQ_11;
		break;
	case 48000:
		value |= KIRKWOOD_DCO_CTL_FREQ_12;
		break;
	case 96000:
		value |= KIRKWOOD_DCO_CTL_FREQ_24;
		break;
	}
	writel(value, io + KIRKWOOD_DCO_CTL);

	/* wait for dco locked */
	do {
		cpu_relax();
		value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
		value &= KIRKWOOD_DCO_SPCR_STATUS_DCO_LOCK;
	} while (value == 0);
}

static void kirkwood_set_rate(struct snd_soc_dai *dai,
	struct kirkwood_dma_data *priv, unsigned long rate)
{
	uint32_t clks_ctrl;

	if (rate == 44100 || rate == 48000 || rate == 96000) {
		/* use internal dco for the supported rates
		 * defined in kirkwood_i2s_dai */
		dev_dbg(dai->dev, "%s: dco set rate = %lu\n",
			__func__, rate);
		kirkwood_set_dco(priv->io, rate);

		clks_ctrl = KIRKWOOD_MCLK_SOURCE_DCO;
	} else {
		/* use the external clock for the other rates
		 * defined in kirkwood_i2s_dai_extclk */
		dev_dbg(dai->dev, "%s: extclk set rate = %lu -> %lu\n",
			__func__, rate, 256 * rate);
		clk_set_rate(priv->extclk, 256 * rate);

		clks_ctrl = KIRKWOOD_MCLK_SOURCE_EXTCLK;
	}
	writel(clks_ctrl, priv->io + KIRKWOOD_CLOCKS_CTRL);
}

static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);

	snd_soc_dai_set_dma_data(dai, substream, priv);
	return 0;
}

static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	uint32_t ctl_play, ctl_rec;
	unsigned int i2s_reg;
	unsigned long i2s_value;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		i2s_reg = KIRKWOOD_I2S_PLAYCTL;
	} else {
		i2s_reg = KIRKWOOD_I2S_RECCTL;
	}

	kirkwood_set_rate(dai, priv, params_rate(params));

	i2s_value = readl(priv->io+i2s_reg);
	i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;

	/*
	 * Size settings in play/rec i2s control regs and play/rec control
	 * regs must be the same.
	 */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
		ctl_play = KIRKWOOD_PLAYCTL_SIZE_16_C |
			   KIRKWOOD_PLAYCTL_I2S_EN;
		ctl_rec = KIRKWOOD_RECCTL_SIZE_16_C |
			  KIRKWOOD_RECCTL_I2S_EN;
		break;
	/*
	 * doesn't work... S20_3LE != kirkwood 20bit format ?
	 *
	case SNDRV_PCM_FORMAT_S20_3LE:
		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
		ctl_play = KIRKWOOD_PLAYCTL_SIZE_20 |
			   KIRKWOOD_PLAYCTL_I2S_EN;
		ctl_rec = KIRKWOOD_RECCTL_SIZE_20 |
			  KIRKWOOD_RECCTL_I2S_EN;
		break;
	*/
	case SNDRV_PCM_FORMAT_S24_LE:
		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
		ctl_play = KIRKWOOD_PLAYCTL_SIZE_24 |
			   KIRKWOOD_PLAYCTL_I2S_EN;
		ctl_rec = KIRKWOOD_RECCTL_SIZE_24 |
			  KIRKWOOD_RECCTL_I2S_EN;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
		ctl_play = KIRKWOOD_PLAYCTL_SIZE_32 |
			   KIRKWOOD_PLAYCTL_I2S_EN;
		ctl_rec = KIRKWOOD_RECCTL_SIZE_32 |
			  KIRKWOOD_RECCTL_I2S_EN;
		break;
	default:
		return -EINVAL;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		if (params_channels(params) == 1)
			ctl_play |= KIRKWOOD_PLAYCTL_MONO_BOTH;
		else
			ctl_play |= KIRKWOOD_PLAYCTL_MONO_OFF;

		priv->ctl_play &= ~(KIRKWOOD_PLAYCTL_MONO_MASK |
				    KIRKWOOD_PLAYCTL_ENABLE_MASK |
				    KIRKWOOD_PLAYCTL_SIZE_MASK);
		priv->ctl_play |= ctl_play;
	} else {
		priv->ctl_rec &= ~KIRKWOOD_RECCTL_SIZE_MASK;
		priv->ctl_rec |= ctl_rec;
	}

	writel(i2s_value, priv->io+i2s_reg);

	return 0;
}

static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
				int cmd, struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	uint32_t ctl, value;

	ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
	if (ctl & KIRKWOOD_PLAYCTL_PAUSE) {
		unsigned timeout = 5000;
		/*
		 * The Armada510 spec says that if we enter pause mode, the
		 * busy bit must be read back as clear _twice_.  Make sure
		 * we respect that otherwise we get DMA underruns.
		 */
		do {
			value = ctl;
			ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
			if (!((ctl | value) & KIRKWOOD_PLAYCTL_PLAY_BUSY))
				break;
			udelay(1);
		} while (timeout--);

		if ((ctl | value) & KIRKWOOD_PLAYCTL_PLAY_BUSY)
			dev_notice(dai->dev, "timed out waiting for busy to deassert: %08x\n",
				   ctl);
	}

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		/* configure */
		ctl = priv->ctl_play;
		value = ctl & ~KIRKWOOD_PLAYCTL_ENABLE_MASK;
		writel(value, priv->io + KIRKWOOD_PLAYCTL);

		/* enable interrupts */
		value = readl(priv->io + KIRKWOOD_INT_MASK);
		value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
		writel(value, priv->io + KIRKWOOD_INT_MASK);

		/* enable playback */
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
		/* stop audio, disable interrupts */
		ctl |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);

		value = readl(priv->io + KIRKWOOD_INT_MASK);
		value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
		writel(value, priv->io + KIRKWOOD_INT_MASK);

		/* disable all playbacks */
		ctl &= ~KIRKWOOD_PLAYCTL_ENABLE_MASK;
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
		break;

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		ctl |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
		break;

	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		ctl &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE);
		writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
				int cmd, struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	uint32_t ctl, value;

	value = readl(priv->io + KIRKWOOD_RECCTL);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		/* configure */
		ctl = priv->ctl_rec;
		value = ctl & ~KIRKWOOD_RECCTL_I2S_EN;
		writel(value, priv->io + KIRKWOOD_RECCTL);

		/* enable interrupts */
		value = readl(priv->io + KIRKWOOD_INT_MASK);
		value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
		writel(value, priv->io + KIRKWOOD_INT_MASK);

		/* enable record */
		writel(ctl, priv->io + KIRKWOOD_RECCTL);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
		/* stop audio, disable interrupts */
		value = readl(priv->io + KIRKWOOD_RECCTL);
		value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
		writel(value, priv->io + KIRKWOOD_RECCTL);

		value = readl(priv->io + KIRKWOOD_INT_MASK);
		value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
		writel(value, priv->io + KIRKWOOD_INT_MASK);

		/* disable all records */
		value = readl(priv->io + KIRKWOOD_RECCTL);
		value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
		writel(value, priv->io + KIRKWOOD_RECCTL);
		break;

	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		value = readl(priv->io + KIRKWOOD_RECCTL);
		value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
		writel(value, priv->io + KIRKWOOD_RECCTL);
		break;

	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		value = readl(priv->io + KIRKWOOD_RECCTL);
		value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE);
		writel(value, priv->io + KIRKWOOD_RECCTL);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
			       struct snd_soc_dai *dai)
{
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		return kirkwood_i2s_play_trigger(substream, cmd, dai);
	else
		return kirkwood_i2s_rec_trigger(substream, cmd, dai);

	return 0;
}

static int kirkwood_i2s_probe(struct snd_soc_dai *dai)
{
	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	unsigned long value;
	unsigned int reg_data;

	/* put system in a "safe" state : */
	/* disable audio interrupts */
	writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
	writel(0, priv->io + KIRKWOOD_INT_MASK);

	reg_data = readl(priv->io + 0x1200);
	reg_data &= (~(0x333FF8));
	reg_data |= 0x111D18;
	writel(reg_data, priv->io + 0x1200);

	msleep(500);

	reg_data = readl(priv->io + 0x1200);
	reg_data &= (~(0x333FF8));
	reg_data |= 0x111D18;
	writel(reg_data, priv->io + 0x1200);

	/* disable playback/record */
	value = readl(priv->io + KIRKWOOD_PLAYCTL);
	value &= ~KIRKWOOD_PLAYCTL_ENABLE_MASK;
	writel(value, priv->io + KIRKWOOD_PLAYCTL);

	value = readl(priv->io + KIRKWOOD_RECCTL);
	value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
	writel(value, priv->io + KIRKWOOD_RECCTL);

	return 0;

}

static const struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
	.startup	= kirkwood_i2s_startup,
	.trigger	= kirkwood_i2s_trigger,
	.hw_params      = kirkwood_i2s_hw_params,
	.set_fmt        = kirkwood_i2s_set_fmt,
};


static struct snd_soc_dai_driver kirkwood_i2s_dai = {
	.probe = kirkwood_i2s_probe,
	.playback = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
				SNDRV_PCM_RATE_96000,
		.formats = KIRKWOOD_I2S_FORMATS,
	},
	.capture = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
				SNDRV_PCM_RATE_96000,
		.formats = KIRKWOOD_I2S_FORMATS,
	},
	.ops = &kirkwood_i2s_dai_ops,
};

static struct snd_soc_dai_driver kirkwood_i2s_dai_extclk = {
	.probe = kirkwood_i2s_probe,
	.playback = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_192000 |
			 SNDRV_PCM_RATE_CONTINUOUS |
			 SNDRV_PCM_RATE_KNOT,
		.formats = KIRKWOOD_I2S_FORMATS,
	},
	.capture = {
		.channels_min = 1,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_192000 |
			 SNDRV_PCM_RATE_CONTINUOUS |
			 SNDRV_PCM_RATE_KNOT,
		.formats = KIRKWOOD_I2S_FORMATS,
	},
	.ops = &kirkwood_i2s_dai_ops,
};

static const struct snd_soc_component_driver kirkwood_i2s_component = {
	.name		= DRV_NAME,
};

static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
{
	struct kirkwood_asoc_platform_data *data = pdev->dev.platform_data;
	struct snd_soc_dai_driver *soc_dai = &kirkwood_i2s_dai;
	struct kirkwood_dma_data *priv;
	struct resource *mem;
	int err;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		dev_err(&pdev->dev, "allocation failed\n");
		return -ENOMEM;
	}
	dev_set_drvdata(&pdev->dev, priv);

	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->io = devm_ioremap_resource(&pdev->dev, mem);
	if (IS_ERR(priv->io))
		return PTR_ERR(priv->io);

	priv->irq = platform_get_irq(pdev, 0);
	if (priv->irq <= 0) {
		dev_err(&pdev->dev, "platform_get_irq failed\n");
		return -ENXIO;
	}

	if (!data) {
		dev_err(&pdev->dev, "no platform data ?!\n");
		return -EINVAL;
	}

	priv->burst = data->burst;

	priv->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(priv->clk)) {
		dev_err(&pdev->dev, "no clock\n");
		return PTR_ERR(priv->clk);
	}

	err = clk_prepare_enable(priv->clk);
	if (err < 0)
		return err;

	priv->extclk = devm_clk_get(&pdev->dev, "extclk");
	if (!IS_ERR(priv->extclk)) {
		if (priv->extclk == priv->clk) {
			devm_clk_put(&pdev->dev, priv->extclk);
			priv->extclk = ERR_PTR(-EINVAL);
		} else {
			dev_info(&pdev->dev, "found external clock\n");
			clk_prepare_enable(priv->extclk);
			soc_dai = &kirkwood_i2s_dai_extclk;
		}
	}

	/* Some sensible defaults - this reflects the powerup values */
	priv->ctl_play = KIRKWOOD_PLAYCTL_SIZE_24;
	priv->ctl_rec = KIRKWOOD_RECCTL_SIZE_24;

	/* Select the burst size */
	if (data->burst == 32) {
		priv->ctl_play |= KIRKWOOD_PLAYCTL_BURST_32;
		priv->ctl_rec |= KIRKWOOD_RECCTL_BURST_32;
	} else {
		priv->ctl_play |= KIRKWOOD_PLAYCTL_BURST_128;
		priv->ctl_rec |= KIRKWOOD_RECCTL_BURST_128;
	}

	err = snd_soc_register_component(&pdev->dev, &kirkwood_i2s_component,
					 soc_dai, 1);
	if (!err)
		return 0;
	dev_err(&pdev->dev, "snd_soc_register_component failed\n");

	if (!IS_ERR(priv->extclk))
		clk_disable_unprepare(priv->extclk);
	clk_disable_unprepare(priv->clk);

	return err;
}

static int kirkwood_i2s_dev_remove(struct platform_device *pdev)
{
	struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);

	snd_soc_unregister_component(&pdev->dev);

	if (!IS_ERR(priv->extclk))
		clk_disable_unprepare(priv->extclk);
	clk_disable_unprepare(priv->clk);

	return 0;
}

static struct platform_driver kirkwood_i2s_driver = {
	.probe  = kirkwood_i2s_dev_probe,
	.remove = kirkwood_i2s_dev_remove,
	.driver = {
		.name = DRV_NAME,
		.owner = THIS_MODULE,
	},
};

module_platform_driver(kirkwood_i2s_driver);

/* Module information */
MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:kirkwood-i2s");
Commit	Line	Data
f9b95980	1	/*
	2	* kirkwood-i2s.c
	3	*
	4	* (c) 2010 Arnaud Patard <apatard@mandriva.com>
69737897	5	* (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
f9b95980	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or (at your
	10	* option) any later version.
	11	*/
	12
	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/platform_device.h>
	16	#include <linux/io.h>
	17	#include <linux/slab.h>
	18	#include <linux/mbus.h>
	19	#include <linux/delay.h>
e919c716	20	#include <linux/clk.h>
f9b95980	21	#include <sound/pcm.h>
	22	#include <sound/pcm_params.h>
	23	#include <sound/soc.h>
c02cecb9	24	#include <linux/platform_data/asoc-kirkwood.h>
f9b95980	25	#include "kirkwood.h"
	26
	27	#define DRV_NAME "kirkwood-i2s"
	28
f9b95980	29	#define KIRKWOOD_I2S_FORMATS \
	30	(SNDRV_PCM_FMTBIT_S16_LE \| \
	31	SNDRV_PCM_FMTBIT_S24_LE \| \
	32	SNDRV_PCM_FMTBIT_S32_LE)
	33
f9b95980	34	static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
	35	unsigned int fmt)
	36	{
f0fba2ad	37	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
f9b95980	38	unsigned long mask;
	39	unsigned long value;
	40
	41	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	42	case SND_SOC_DAIFMT_RIGHT_J:
	43	mask = KIRKWOOD_I2S_CTL_RJ;
	44	break;
	45	case SND_SOC_DAIFMT_LEFT_J:
	46	mask = KIRKWOOD_I2S_CTL_LJ;
	47	break;
	48	case SND_SOC_DAIFMT_I2S:
	49	mask = KIRKWOOD_I2S_CTL_I2S;
	50	break;
	51	default:
	52	return -EINVAL;
	53	}
	54
	55	/*
	56	* Set same format for playback and record
	57	* This avoids some troubles.
	58	*/
	59	value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
	60	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
	61	value \|= mask;
	62	writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);
	63
	64	value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
	65	value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
	66	value \|= mask;
	67	writel(value, priv->io+KIRKWOOD_I2S_RECCTL);
	68
	69	return 0;
	70	}
	71
	72	static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
	73	{
	74	unsigned long value;
	75
	76	value = KIRKWOOD_DCO_CTL_OFFSET_0;
	77	switch (rate) {
	78	default:
	79	case 44100:
	80	value \|= KIRKWOOD_DCO_CTL_FREQ_11;
	81	break;
	82	case 48000:
	83	value \|= KIRKWOOD_DCO_CTL_FREQ_12;
	84	break;
	85	case 96000:
	86	value \|= KIRKWOOD_DCO_CTL_FREQ_24;
	87	break;
	88	}
	89	writel(value, io + KIRKWOOD_DCO_CTL);
	90
	91	/* wait for dco locked */
	92	do {
	93	cpu_relax();
	94	value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
2424d458	95	value &= KIRKWOOD_DCO_SPCR_STATUS_DCO_LOCK;
f9b95980	96	} while (value == 0);
	97	}
	98
363589bf RK	99	static void kirkwood_set_rate(struct snd_soc_dai *dai,
	100	struct kirkwood_dma_data *priv, unsigned long rate)
	101	{
	102	uint32_t clks_ctrl;
	103
	104	if (rate == 44100 \|\| rate == 48000 \|\| rate == 96000) {
8a537f85 JFM	105	/* use internal dco for the supported rates
8a537f85 JFM	106	* defined in kirkwood_i2s_dai */
363589bf RK	107	dev_dbg(dai->dev, "%s: dco set rate = %lu\n",
	108	__func__, rate);
	109	kirkwood_set_dco(priv->io, rate);
	110
	111	clks_ctrl = KIRKWOOD_MCLK_SOURCE_DCO;
8a537f85 JFM	112	} else {
	113	/* use the external clock for the other rates
	114	* defined in kirkwood_i2s_dai_extclk */
363589bf RK	115	dev_dbg(dai->dev, "%s: extclk set rate = %lu -> %lu\n",
	116	__func__, rate, 256 * rate);
	117	clk_set_rate(priv->extclk, 256 * rate);
	118
	119	clks_ctrl = KIRKWOOD_MCLK_SOURCE_EXTCLK;
	120	}
	121	writel(clks_ctrl, priv->io + KIRKWOOD_CLOCKS_CTRL);
	122	}
	123
f0fba2ad LG	124	static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
	125	struct snd_soc_dai *dai)
	126	{
	127	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
	128
	129	snd_soc_dai_set_dma_data(dai, substream, priv);
	130	return 0;
	131	}
	132
f9b95980	133	static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
	134	struct snd_pcm_hw_params *params,
	135	struct snd_soc_dai *dai)
	136	{
f0fba2ad	137	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
d8d11ba5 RK	138	uint32_t ctl_play, ctl_rec;
	139	unsigned int i2s_reg;
	140	unsigned long i2s_value;
f9b95980	141
	142	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	143	i2s_reg = KIRKWOOD_I2S_PLAYCTL;
f9b95980	144	} else {
f9b95980	145	i2s_reg = KIRKWOOD_I2S_RECCTL;
f9b95980	146	}
f9b95980	147
363589bf	148	kirkwood_set_rate(dai, priv, params_rate(params));
f9b95980	149
	150	i2s_value = readl(priv->io+i2s_reg);
	151	i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;
	152
f9b95980	153	/*
	154	* Size settings in play/rec i2s control regs and play/rec control
	155	* regs must be the same.
	156	*/
	157	switch (params_format(params)) {
	158	case SNDRV_PCM_FORMAT_S16_LE:
	159	i2s_value \|= KIRKWOOD_I2S_CTL_SIZE_16;
d8d11ba5 RK	160	ctl_play = KIRKWOOD_PLAYCTL_SIZE_16_C \|
	161	KIRKWOOD_PLAYCTL_I2S_EN;
	162	ctl_rec = KIRKWOOD_RECCTL_SIZE_16_C \|
	163	KIRKWOOD_RECCTL_I2S_EN;
f9b95980	164	break;
	165	/*
	166	* doesn't work... S20_3LE != kirkwood 20bit format ?
	167	*
	168	case SNDRV_PCM_FORMAT_S20_3LE:
	169	i2s_value \|= KIRKWOOD_I2S_CTL_SIZE_20;
d8d11ba5 RK	170	ctl_play = KIRKWOOD_PLAYCTL_SIZE_20 \|
	171	KIRKWOOD_PLAYCTL_I2S_EN;
	172	ctl_rec = KIRKWOOD_RECCTL_SIZE_20 \|
	173	KIRKWOOD_RECCTL_I2S_EN;
f9b95980	174	break;
	175	*/
	176	case SNDRV_PCM_FORMAT_S24_LE:
	177	i2s_value \|= KIRKWOOD_I2S_CTL_SIZE_24;
d8d11ba5 RK	178	ctl_play = KIRKWOOD_PLAYCTL_SIZE_24 \|
	179	KIRKWOOD_PLAYCTL_I2S_EN;
	180	ctl_rec = KIRKWOOD_RECCTL_SIZE_24 \|
	181	KIRKWOOD_RECCTL_I2S_EN;
f9b95980	182	break;
	183	case SNDRV_PCM_FORMAT_S32_LE:
	184	i2s_value \|= KIRKWOOD_I2S_CTL_SIZE_32;
d8d11ba5 RK	185	ctl_play = KIRKWOOD_PLAYCTL_SIZE_32 \|
	186	KIRKWOOD_PLAYCTL_I2S_EN;
	187	ctl_rec = KIRKWOOD_RECCTL_SIZE_32 \|
	188	KIRKWOOD_RECCTL_I2S_EN;
f9b95980	189	break;
	190	default:
	191	return -EINVAL;
	192	}
dfe4c936	193
dfe4c936	194	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
dfe4c936	195	if (params_channels(params) == 1)
d8d11ba5	196	ctl_play \|= KIRKWOOD_PLAYCTL_MONO_BOTH;
dfe4c936	197	else
d8d11ba5 RK	198	ctl_play \|= KIRKWOOD_PLAYCTL_MONO_OFF;
	199
	200	priv->ctl_play &= ~(KIRKWOOD_PLAYCTL_MONO_MASK \|
db43b16f	201	KIRKWOOD_PLAYCTL_ENABLE_MASK \|
d8d11ba5 RK	202	KIRKWOOD_PLAYCTL_SIZE_MASK);
	203	priv->ctl_play \|= ctl_play;
	204	} else {
	205	priv->ctl_rec &= ~KIRKWOOD_RECCTL_SIZE_MASK;
	206	priv->ctl_rec \|= ctl_rec;
dfe4c936	207	}
dfe4c936	208
f9b95980	209	writel(i2s_value, priv->io+i2s_reg);
f9b95980	210
	211	return 0;
	212	}
	213
	214	static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
	215	int cmd, struct snd_soc_dai *dai)
	216	{
f0fba2ad	217	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
982b604b RK	218	uint32_t ctl, value;
	219
	220	ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
	221	if (ctl & KIRKWOOD_PLAYCTL_PAUSE) {
	222	unsigned timeout = 5000;
	223	/*
	224	* The Armada510 spec says that if we enter pause mode, the
	225	* busy bit must be read back as clear _twice_. Make sure
	226	* we respect that otherwise we get DMA underruns.
	227	*/
	228	do {
	229	value = ctl;
	230	ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
	231	if (!((ctl \| value) & KIRKWOOD_PLAYCTL_PLAY_BUSY))
	232	break;
	233	udelay(1);
	234	} while (timeout--);
	235
	236	if ((ctl \| value) & KIRKWOOD_PLAYCTL_PLAY_BUSY)
	237	dev_notice(dai->dev, "timed out waiting for busy to deassert: %08x\n",
	238	ctl);
	239	}
f9b95980	240
	241	switch (cmd) {
	242	case SNDRV_PCM_TRIGGER_START:
d8d11ba5 RK	243	/* configure */
d8d11ba5 RK	244	ctl = priv->ctl_play;
db43b16f	245	value = ctl & ~KIRKWOOD_PLAYCTL_ENABLE_MASK;
d8d11ba5 RK	246	writel(value, priv->io + KIRKWOOD_PLAYCTL);
	247
	248	/* enable interrupts */
f9b95980	249	value = readl(priv->io + KIRKWOOD_INT_MASK);
	250	value \|= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
	251	writel(value, priv->io + KIRKWOOD_INT_MASK);
	252
d8d11ba5	253	/* enable playback */
982b604b	254	writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
f9b95980	255	break;
	256
	257	case SNDRV_PCM_TRIGGER_STOP:
	258	/* stop audio, disable interrupts */
982b604b RK	259	ctl \|= KIRKWOOD_PLAYCTL_PAUSE \| KIRKWOOD_PLAYCTL_I2S_MUTE;
982b604b RK	260	writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
f9b95980	261
	262	value = readl(priv->io + KIRKWOOD_INT_MASK);
	263	value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
	264	writel(value, priv->io + KIRKWOOD_INT_MASK);
	265
	266	/* disable all playbacks */
db43b16f	267	ctl &= ~KIRKWOOD_PLAYCTL_ENABLE_MASK;
982b604b	268	writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
f9b95980	269	break;
	270
	271	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	272	case SNDRV_PCM_TRIGGER_SUSPEND:
982b604b RK	273	ctl \|= KIRKWOOD_PLAYCTL_PAUSE \| KIRKWOOD_PLAYCTL_I2S_MUTE;
982b604b RK	274	writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
f9b95980	275	break;
	276
	277	case SNDRV_PCM_TRIGGER_RESUME:
	278	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
982b604b RK	279	ctl &= ~(KIRKWOOD_PLAYCTL_PAUSE \| KIRKWOOD_PLAYCTL_I2S_MUTE);
982b604b RK	280	writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
f9b95980	281	break;
	282
	283	default:
	284	return -EINVAL;
	285	}
	286
	287	return 0;
	288	}
	289
	290	static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
	291	int cmd, struct snd_soc_dai *dai)
	292	{
f0fba2ad	293	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
d8d11ba5	294	uint32_t ctl, value;
f9b95980	295
	296	value = readl(priv->io + KIRKWOOD_RECCTL);
	297
	298	switch (cmd) {
	299	case SNDRV_PCM_TRIGGER_START:
d8d11ba5 RK	300	/* configure */
	301	ctl = priv->ctl_rec;
	302	value = ctl & ~KIRKWOOD_RECCTL_I2S_EN;
	303	writel(value, priv->io + KIRKWOOD_RECCTL);
	304
	305	/* enable interrupts */
f9b95980	306	value = readl(priv->io + KIRKWOOD_INT_MASK);
	307	value \|= KIRKWOOD_INT_CAUSE_REC_BYTES;
	308	writel(value, priv->io + KIRKWOOD_INT_MASK);
	309
d8d11ba5 RK	310	/* enable record */
d8d11ba5 RK	311	writel(ctl, priv->io + KIRKWOOD_RECCTL);
f9b95980	312	break;
	313
	314	case SNDRV_PCM_TRIGGER_STOP:
	315	/* stop audio, disable interrupts */
	316	value = readl(priv->io + KIRKWOOD_RECCTL);
b424ec95	317	value \|= KIRKWOOD_RECCTL_PAUSE \| KIRKWOOD_RECCTL_MUTE;
f9b95980	318	writel(value, priv->io + KIRKWOOD_RECCTL);
	319
	320	value = readl(priv->io + KIRKWOOD_INT_MASK);
	321	value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
	322	writel(value, priv->io + KIRKWOOD_INT_MASK);
	323
	324	/* disable all records */
	325	value = readl(priv->io + KIRKWOOD_RECCTL);
	326	value &= ~(KIRKWOOD_RECCTL_I2S_EN \| KIRKWOOD_RECCTL_SPDIF_EN);
	327	writel(value, priv->io + KIRKWOOD_RECCTL);
	328	break;
	329
	330	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	331	case SNDRV_PCM_TRIGGER_SUSPEND:
	332	value = readl(priv->io + KIRKWOOD_RECCTL);
b424ec95	333	value \|= KIRKWOOD_RECCTL_PAUSE \| KIRKWOOD_RECCTL_MUTE;
f9b95980	334	writel(value, priv->io + KIRKWOOD_RECCTL);
	335	break;
	336
	337	case SNDRV_PCM_TRIGGER_RESUME:
	338	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	339	value = readl(priv->io + KIRKWOOD_RECCTL);
b424ec95	340	value &= ~(KIRKWOOD_RECCTL_PAUSE \| KIRKWOOD_RECCTL_MUTE);
f9b95980	341	writel(value, priv->io + KIRKWOOD_RECCTL);
	342	break;
	343
	344	default:
	345	return -EINVAL;
f9b95980	346	}
	347
	348	return 0;
	349	}
	350
	351	static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
	352	struct snd_soc_dai *dai)
	353	{
	354	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	355	return kirkwood_i2s_play_trigger(substream, cmd, dai);
	356	else
	357	return kirkwood_i2s_rec_trigger(substream, cmd, dai);
	358
	359	return 0;
	360	}
	361
f0fba2ad	362	static int kirkwood_i2s_probe(struct snd_soc_dai *dai)
f9b95980	363	{
f0fba2ad	364	struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
f9b95980	365	unsigned long value;
	366	unsigned int reg_data;
	367
	368	/* put system in a "safe" state : */
	369	/* disable audio interrupts */
	370	writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
	371	writel(0, priv->io + KIRKWOOD_INT_MASK);
	372
	373	reg_data = readl(priv->io + 0x1200);
	374	reg_data &= (~(0x333FF8));
	375	reg_data \|= 0x111D18;
	376	writel(reg_data, priv->io + 0x1200);
	377
	378	msleep(500);
	379
	380	reg_data = readl(priv->io + 0x1200);
	381	reg_data &= (~(0x333FF8));
	382	reg_data \|= 0x111D18;
	383	writel(reg_data, priv->io + 0x1200);
	384
	385	/* disable playback/record */
	386	value = readl(priv->io + KIRKWOOD_PLAYCTL);
db43b16f	387	value &= ~KIRKWOOD_PLAYCTL_ENABLE_MASK;
f9b95980	388	writel(value, priv->io + KIRKWOOD_PLAYCTL);
	389
	390	value = readl(priv->io + KIRKWOOD_RECCTL);
	391	value &= ~(KIRKWOOD_RECCTL_I2S_EN \| KIRKWOOD_RECCTL_SPDIF_EN);
	392	writel(value, priv->io + KIRKWOOD_RECCTL);
	393
	394	return 0;
	395
	396	}
	397
85e7652d	398	static const struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
f0fba2ad	399	.startup = kirkwood_i2s_startup,
f9b95980	400	.trigger = kirkwood_i2s_trigger,
	401	.hw_params = kirkwood_i2s_hw_params,
	402	.set_fmt = kirkwood_i2s_set_fmt,
	403	};
	404
	405
f0fba2ad	406	static struct snd_soc_dai_driver kirkwood_i2s_dai = {
f9b95980	407	.probe = kirkwood_i2s_probe,
f9b95980	408	.playback = {
	409	.channels_min = 1,
	410	.channels_max = 2,
9e12cbd9 MB	411	.rates = SNDRV_PCM_RATE_44100 \| SNDRV_PCM_RATE_48000 \|
9e12cbd9 MB	412	SNDRV_PCM_RATE_96000,
363589bf RK	413	.formats = KIRKWOOD_I2S_FORMATS,
363589bf RK	414	},
f9b95980	415	.capture = {
	416	.channels_min = 1,
	417	.channels_max = 2,
9e12cbd9 MB	418	.rates = SNDRV_PCM_RATE_44100 \| SNDRV_PCM_RATE_48000 \|
9e12cbd9 MB	419	SNDRV_PCM_RATE_96000,
363589bf RK	420	.formats = KIRKWOOD_I2S_FORMATS,
	421	},
	422	.ops = &kirkwood_i2s_dai_ops,
	423	};
	424
	425	static struct snd_soc_dai_driver kirkwood_i2s_dai_extclk = {
	426	.probe = kirkwood_i2s_probe,
363589bf RK	427	.playback = {
	428	.channels_min = 1,
	429	.channels_max = 2,
	430	.rates = SNDRV_PCM_RATE_8000_192000 \|
	431	SNDRV_PCM_RATE_CONTINUOUS \|
	432	SNDRV_PCM_RATE_KNOT,
	433	.formats = KIRKWOOD_I2S_FORMATS,
	434	},
	435	.capture = {
	436	.channels_min = 1,
	437	.channels_max = 2,
	438	.rates = SNDRV_PCM_RATE_8000_192000 \|
	439	SNDRV_PCM_RATE_CONTINUOUS \|
	440	SNDRV_PCM_RATE_KNOT,
	441	.formats = KIRKWOOD_I2S_FORMATS,
	442	},
f9b95980	443	.ops = &kirkwood_i2s_dai_ops,
f9b95980	444	};
f9b95980	445
83d85f53 KM	446	static const struct snd_soc_component_driver kirkwood_i2s_component = {
	447	.name = DRV_NAME,
	448	};
	449
34e15fbd	450	static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
f9b95980	451	{
363589bf RK	452	struct kirkwood_asoc_platform_data *data = pdev->dev.platform_data;
363589bf RK	453	struct snd_soc_dai_driver *soc_dai = &kirkwood_i2s_dai;
f0fba2ad	454	struct kirkwood_dma_data *priv;
363589bf	455	struct resource *mem;
f9b95980	456	int err;
f9b95980	457
dbc517bf	458	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
f9b95980	459	if (!priv) {
f9b95980	460	dev_err(&pdev->dev, "allocation failed\n");
dbc517bf	461	return -ENOMEM;
f9b95980	462	}
f0fba2ad	463	dev_set_drvdata(&pdev->dev, priv);
f9b95980	464
f9b95980	465	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
b25b5aa0 TR	466	priv->io = devm_ioremap_resource(&pdev->dev, mem);
	467	if (IS_ERR(priv->io))
	468	return PTR_ERR(priv->io);
f9b95980	469
	470	priv->irq = platform_get_irq(pdev, 0);
	471	if (priv->irq <= 0) {
	472	dev_err(&pdev->dev, "platform_get_irq failed\n");
dbc517bf	473	return -ENXIO;
f9b95980	474	}
f9b95980	475
d4d9820b	476	if (!data) {
f9b95980	477	dev_err(&pdev->dev, "no platform data ?!\n");
dbc517bf	478	return -EINVAL;
f9b95980	479	}
f9b95980	480
f9b95980	481	priv->burst = data->burst;
f9b95980	482
dbc517bf	483	priv->clk = devm_clk_get(&pdev->dev, NULL);
e919c716 AL	484	if (IS_ERR(priv->clk)) {
e919c716 AL	485	dev_err(&pdev->dev, "no clock\n");
dbc517bf	486	return PTR_ERR(priv->clk);
e919c716	487	}
dbc517bf RK	488
	489	err = clk_prepare_enable(priv->clk);
	490	if (err < 0)
	491	return err;
e919c716	492
4734dc96	493	priv->extclk = devm_clk_get(&pdev->dev, "extclk");
d8d11ba5 RK	494	if (!IS_ERR(priv->extclk)) {
d8d11ba5 RK	495	if (priv->extclk == priv->clk) {
af64d734	496	devm_clk_put(&pdev->dev, priv->extclk);
d8d11ba5 RK	497	priv->extclk = ERR_PTR(-EINVAL);
	498	} else {
	499	dev_info(&pdev->dev, "found external clock\n");
	500	clk_prepare_enable(priv->extclk);
	501	soc_dai = &kirkwood_i2s_dai_extclk;
	502	}
	503	}
	504
	505	/* Some sensible defaults - this reflects the powerup values */
	506	priv->ctl_play = KIRKWOOD_PLAYCTL_SIZE_24;
	507	priv->ctl_rec = KIRKWOOD_RECCTL_SIZE_24;
	508
	509	/* Select the burst size */
	510	if (data->burst == 32) {
	511	priv->ctl_play \|= KIRKWOOD_PLAYCTL_BURST_32;
	512	priv->ctl_rec \|= KIRKWOOD_RECCTL_BURST_32;
	513	} else {
	514	priv->ctl_play \|= KIRKWOOD_PLAYCTL_BURST_128;
	515	priv->ctl_rec \|= KIRKWOOD_RECCTL_BURST_128;
	516	}
	517
83d85f53 KM	518	err = snd_soc_register_component(&pdev->dev, &kirkwood_i2s_component,
83d85f53 KM	519	soc_dai, 1);
baffab28 SB	520	if (!err)
baffab28 SB	521	return 0;
83d85f53	522	dev_err(&pdev->dev, "snd_soc_register_component failed\n");
baffab28	523
4734dc96	524	if (!IS_ERR(priv->extclk))
363589bf	525	clk_disable_unprepare(priv->extclk);
baffab28	526	clk_disable_unprepare(priv->clk);
dbc517bf	527
f9b95980	528	return err;
	529	}
	530
34e15fbd	531	static int kirkwood_i2s_dev_remove(struct platform_device *pdev)
f9b95980	532	{
f0fba2ad LG	533	struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);
f0fba2ad LG	534
83d85f53	535	snd_soc_unregister_component(&pdev->dev);
e919c716	536
4734dc96	537	if (!IS_ERR(priv->extclk))
363589bf	538	clk_disable_unprepare(priv->extclk);
e919c716	539	clk_disable_unprepare(priv->clk);
f0fba2ad	540
f9b95980	541	return 0;
	542	}
	543
	544	static struct platform_driver kirkwood_i2s_driver = {
	545	.probe = kirkwood_i2s_dev_probe,
34e15fbd	546	.remove = kirkwood_i2s_dev_remove,
f9b95980	547	.driver = {
	548	.name = DRV_NAME,
	549	.owner = THIS_MODULE,
	550	},
	551	};
	552
41b10225	553	module_platform_driver(kirkwood_i2s_driver);
f9b95980	554
f9b95980	555	/* Module information */
69737897	556	MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
f9b95980	557	MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
	558	MODULE_LICENSE("GPL");
	559	MODULE_ALIAS("platform:kirkwood-i2s");