[linux-2.6-block.git] / sound / soc / au1x / psc-i2s.c

/*
 * Au12x0/Au1550 PSC ALSA ASoC audio support.
 *
 * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
 *	Manuel Lauss <manuel.lauss@gmail.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.
 *
 * Au1xxx-PSC I2S glue.
 *
 * NOTE: all of these drivers can only work with a SINGLE instance
 *	 of a PSC. Multiple independent audio devices are impossible
 *	 with ASoC v1.
 * NOTE: so far only PSC slave mode (bit- and frameclock) is supported.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/suspend.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/au1xxx_psc.h>

#include "psc.h"

/* supported I2S DAI hardware formats */
#define AU1XPSC_I2S_DAIFMT \
	(SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J |	\
	 SND_SOC_DAIFMT_NB_NF)

/* supported I2S direction */
#define AU1XPSC_I2S_DIR \
	(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)

#define AU1XPSC_I2S_RATES \
	SNDRV_PCM_RATE_8000_192000

#define AU1XPSC_I2S_FMTS \
	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE)

#define I2SSTAT_BUSY(stype)	\
	((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
#define I2SPCR_START(stype)	\
	((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
#define I2SPCR_STOP(stype)	\
	((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
#define I2SPCR_CLRFIFO(stype)	\
	((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)


/* instance data. There can be only one, MacLeod!!!! */
static struct au1xpsc_audio_data *au1xpsc_i2s_workdata;

static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
			       unsigned int fmt)
{
	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	unsigned long ct;
	int ret;

	ret = -EINVAL;

	ct = pscdata->cfg;

	ct &= ~(PSC_I2SCFG_XM | PSC_I2SCFG_MLJ);	/* left-justified */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		ct |= PSC_I2SCFG_XM;	/* enable I2S mode */
		break;
	case SND_SOC_DAIFMT_MSB:
		break;
	case SND_SOC_DAIFMT_LSB:
		ct |= PSC_I2SCFG_MLJ;	/* LSB (right-) justified */
		break;
	default:
		goto out;
	}

	ct &= ~(PSC_I2SCFG_BI | PSC_I2SCFG_WI);		/* IB-IF */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		ct |= PSC_I2SCFG_BI | PSC_I2SCFG_WI;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		ct |= PSC_I2SCFG_BI;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		ct |= PSC_I2SCFG_WI;
		break;
	case SND_SOC_DAIFMT_IB_IF:
		break;
	default:
		goto out;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:	/* CODEC master */
		ct |= PSC_I2SCFG_MS;	/* PSC I2S slave mode */
		break;
	case SND_SOC_DAIFMT_CBS_CFS:	/* CODEC slave */
		ct &= ~PSC_I2SCFG_MS;	/* PSC I2S Master mode */
		break;
	default:
		goto out;
	}

	pscdata->cfg = ct;
	ret = 0;
out:
	return ret;
}

static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *dai)
{
	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;

	int cfgbits;
	unsigned long stat;

	/* check if the PSC is already streaming data */
	stat = au_readl(I2S_STAT(pscdata));
	if (stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB)) {
		/* reject parameters not currently set up in hardware */
		cfgbits = au_readl(I2S_CFG(pscdata));
		if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) ||
		    (params_rate(params) != pscdata->rate))
			return -EINVAL;
	} else {
		/* set sample bitdepth */
		pscdata->cfg &= ~(0x1f << 4);
		pscdata->cfg |= PSC_I2SCFG_SET_LEN(params->msbits);
		/* remember current rate for other stream */
		pscdata->rate = params_rate(params);
	}
	return 0;
}

/* Configure PSC late:  on my devel systems the codec  is I2S master and
 * supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit.  ASoC
 * uses aggressive PM and  switches the codec off  when it is not in use
 * which also means the PSC unit doesn't get any clocks and is therefore
 * dead. That's why this chunk here gets called from the trigger callback
 * because I can be reasonably certain the codec is driving the clocks.
 */
static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
{
	unsigned long tmo;

	/* bring PSC out of sleep, and configure I2S unit */
	au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
	au_sync();

	tmo = 1000000;
	while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
		tmo--;

	if (!tmo)
		goto psc_err;

	au_writel(0, I2S_CFG(pscdata));
	au_sync();
	au_writel(pscdata->cfg | PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
	au_sync();

	/* wait for I2S controller to become ready */
	tmo = 1000000;
	while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
		tmo--;

	if (tmo)
		return 0;

psc_err:
	au_writel(0, I2S_CFG(pscdata));
	au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
	au_sync();
	return -ETIMEDOUT;
}

static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
{
	unsigned long tmo, stat;
	int ret;

	ret = 0;

	/* if both TX and RX are idle, configure the PSC  */
	stat = au_readl(I2S_STAT(pscdata));
	if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
		ret = au1xpsc_i2s_configure(pscdata);
		if (ret)
			goto out;
	}

	au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
	au_sync();
	au_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
	au_sync();

	/* wait for start confirmation */
	tmo = 1000000;
	while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
		tmo--;

	if (!tmo) {
		au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
		au_sync();
		ret = -ETIMEDOUT;
	}
out:
	return ret;
}

static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
{
	unsigned long tmo, stat;

	au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
	au_sync();

	/* wait for stop confirmation */
	tmo = 1000000;
	while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
		tmo--;

	/* if both TX and RX are idle, disable PSC */
	stat = au_readl(I2S_STAT(pscdata));
	if (!(stat & (PSC_I2SSTAT_TB | PSC_I2SSTAT_RB))) {
		au_writel(0, I2S_CFG(pscdata));
		au_sync();
		au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
		au_sync();
	}
	return 0;
}

static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
			       struct snd_soc_dai *dai)
{
	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	int ret, stype = SUBSTREAM_TYPE(substream);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
		ret = au1xpsc_i2s_start(pscdata, stype);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
		ret = au1xpsc_i2s_stop(pscdata, stype);
		break;
	default:
		ret = -EINVAL;
	}
	return ret;
}

static int au1xpsc_i2s_probe(struct platform_device *pdev,
			     struct snd_soc_dai *dai)
{
	return 	au1xpsc_i2s_workdata ? 0 : -ENODEV;
}

static void au1xpsc_i2s_remove(struct platform_device *pdev,
			       struct snd_soc_dai *dai)
{
}

static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
	.trigger	= au1xpsc_i2s_trigger,
	.hw_params	= au1xpsc_i2s_hw_params,
	.set_fmt	= au1xpsc_i2s_set_fmt,
};

struct snd_soc_dai au1xpsc_i2s_dai = {
	.name			= "au1xpsc_i2s",
	.probe			= au1xpsc_i2s_probe,
	.remove			= au1xpsc_i2s_remove,
	.playback = {
		.rates		= AU1XPSC_I2S_RATES,
		.formats	= AU1XPSC_I2S_FMTS,
		.channels_min	= 2,
		.channels_max	= 8,	/* 2 without external help */
	},
	.capture = {
		.rates		= AU1XPSC_I2S_RATES,
		.formats	= AU1XPSC_I2S_FMTS,
		.channels_min	= 2,
		.channels_max	= 8,	/* 2 without external help */
	},
	.ops = &au1xpsc_i2s_dai_ops,
};
EXPORT_SYMBOL(au1xpsc_i2s_dai);

static int __init au1xpsc_i2s_drvprobe(struct platform_device *pdev)
{
	struct resource *r;
	unsigned long sel;
	int ret;
	struct au1xpsc_audio_data *wd;

	if (au1xpsc_i2s_workdata)
		return -EBUSY;

	wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
	if (!wd)
		return -ENOMEM;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r) {
		ret = -ENODEV;
		goto out0;
	}

	ret = -EBUSY;
	wd->ioarea = request_mem_region(r->start, r->end - r->start + 1,
					"au1xpsc_i2s");
	if (!wd->ioarea)
		goto out0;

	wd->mmio = ioremap(r->start, 0xffff);
	if (!wd->mmio)
		goto out1;

	/* preserve PSC clock source set up by platform (dev.platform_data
	 * is already occupied by soc layer)
	 */
	sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();
	au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(wd));
	au_writel(0, I2S_CFG(wd));
	au_sync();

	/* preconfigure: set max rx/tx fifo depths */
	wd->cfg |= PSC_I2SCFG_RT_FIFO8 | PSC_I2SCFG_TT_FIFO8;

	/* don't wait for I2S core to become ready now; clocks may not
	 * be running yet; depending on clock input for PSC a wait might
	 * time out.
	 */

	ret = snd_soc_register_dai(&au1xpsc_i2s_dai);
	if (ret)
		goto out1;

	/* finally add the DMA device for this PSC */
	wd->dmapd = au1xpsc_pcm_add(pdev);
	if (wd->dmapd) {
		platform_set_drvdata(pdev, wd);
		au1xpsc_i2s_workdata = wd;
		return 0;
	}

	snd_soc_unregister_dai(&au1xpsc_i2s_dai);
out1:
	release_resource(wd->ioarea);
	kfree(wd->ioarea);
out0:
	kfree(wd);
	return ret;
}

static int __devexit au1xpsc_i2s_drvremove(struct platform_device *pdev)
{
	struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);

	if (wd->dmapd)
		au1xpsc_pcm_destroy(wd->dmapd);

	snd_soc_unregister_dai(&au1xpsc_i2s_dai);

	au_writel(0, I2S_CFG(wd));
	au_sync();
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();

	iounmap(wd->mmio);
	release_resource(wd->ioarea);
	kfree(wd->ioarea);
	kfree(wd);

	au1xpsc_i2s_workdata = NULL;	/* MDEV */

	return 0;
}

#ifdef CONFIG_PM
static int au1xpsc_i2s_drvsuspend(struct device *dev)
{
	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);

	/* save interesting register and disable PSC */
	wd->pm[0] = au_readl(PSC_SEL(wd));

	au_writel(0, I2S_CFG(wd));
	au_sync();
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();

	return 0;
}

static int au1xpsc_i2s_drvresume(struct device *dev)
{
	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);

	/* select I2S mode and PSC clock */
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
	au_sync();
	au_writel(0, PSC_SEL(wd));
	au_sync();
	au_writel(wd->pm[0], PSC_SEL(wd));
	au_sync();

	return 0;
}

static struct dev_pm_ops au1xpsci2s_pmops = {
	.suspend	= au1xpsc_i2s_drvsuspend,
	.resume		= au1xpsc_i2s_drvresume,
};

#define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops

#else

#define AU1XPSCI2S_PMOPS NULL

#endif

static struct platform_driver au1xpsc_i2s_driver = {
	.driver		= {
		.name	= "au1xpsc_i2s",
		.owner	= THIS_MODULE,
		.pm	= AU1XPSCI2S_PMOPS,
	},
	.probe		= au1xpsc_i2s_drvprobe,
	.remove		= __devexit_p(au1xpsc_i2s_drvremove),
};

static int __init au1xpsc_i2s_load(void)
{
	au1xpsc_i2s_workdata = NULL;
	return platform_driver_register(&au1xpsc_i2s_driver);
}

static void __exit au1xpsc_i2s_unload(void)
{
	platform_driver_unregister(&au1xpsc_i2s_driver);
}

module_init(au1xpsc_i2s_load);
module_exit(au1xpsc_i2s_unload);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
MODULE_AUTHOR("Manuel Lauss");
Commit	Line	Data
4a161d23 ML	1	/*
	2	* Au12x0/Au1550 PSC ALSA ASoC audio support.
	3	*
	4	* (c) 2007-2008 MSC Vertriebsges.m.b.H.,
0f83d639	5	* Manuel Lauss <manuel.lauss@gmail.com>
4a161d23 ML	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* Au1xxx-PSC I2S glue.
	12	*
	13	* NOTE: all of these drivers can only work with a SINGLE instance
	14	* of a PSC. Multiple independent audio devices are impossible
	15	* with ASoC v1.
	16	* NOTE: so far only PSC slave mode (bit- and frameclock) is supported.
	17	*/
	18
	19	#include <linux/init.h>
	20	#include <linux/module.h>
5a0e3ad6	21	#include <linux/slab.h>
4a161d23 ML	22	#include <linux/suspend.h>
	23	#include <sound/core.h>
	24	#include <sound/pcm.h>
	25	#include <sound/initval.h>
	26	#include <sound/soc.h>
	27	#include <asm/mach-au1x00/au1000.h>
	28	#include <asm/mach-au1x00/au1xxx_psc.h>
	29
	30	#include "psc.h"
	31
	32	/* supported I2S DAI hardware formats */
	33	#define AU1XPSC_I2S_DAIFMT \
	34	(SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_LEFT_J \| \
	35	SND_SOC_DAIFMT_NB_NF)
	36
	37	/* supported I2S direction */
	38	#define AU1XPSC_I2S_DIR \
	39	(SND_SOC_DAIDIR_PLAYBACK \| SND_SOC_DAIDIR_CAPTURE)
	40
	41	#define AU1XPSC_I2S_RATES \
	42	SNDRV_PCM_RATE_8000_192000
	43
	44	#define AU1XPSC_I2S_FMTS \
	45	(SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S24_LE)
	46
	47	#define I2SSTAT_BUSY(stype) \
	48	((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
	49	#define I2SPCR_START(stype) \
	50	((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
	51	#define I2SPCR_STOP(stype) \
	52	((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
	53	#define I2SPCR_CLRFIFO(stype) \
	54	((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
	55
	56
	57	/* instance data. There can be only one, MacLeod!!!! */
	58	static struct au1xpsc_audio_data *au1xpsc_i2s_workdata;
	59
	60	static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
	61	unsigned int fmt)
	62	{
	63	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	64	unsigned long ct;
	65	int ret;
	66
	67	ret = -EINVAL;
	68
	69	ct = pscdata->cfg;
	70
	71	ct &= ~(PSC_I2SCFG_XM \| PSC_I2SCFG_MLJ); /* left-justified */
	72	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	73	case SND_SOC_DAIFMT_I2S:
	74	ct \|= PSC_I2SCFG_XM; /* enable I2S mode */
	75	break;
	76	case SND_SOC_DAIFMT_MSB:
	77	break;
	78	case SND_SOC_DAIFMT_LSB:
	79	ct \|= PSC_I2SCFG_MLJ; /* LSB (right-) justified */
	80	break;
	81	default:
	82	goto out;
	83	}
	84
	85	ct &= ~(PSC_I2SCFG_BI \| PSC_I2SCFG_WI); /* IB-IF */
86	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
87	case SND_SOC_DAIFMT_NB_NF:
88	ct \|= PSC_I2SCFG_BI \| PSC_I2SCFG_WI;
89	break;
90	case SND_SOC_DAIFMT_NB_IF:
91	ct \|= PSC_I2SCFG_BI;
92	break;
93	case SND_SOC_DAIFMT_IB_NF:
94	ct \|= PSC_I2SCFG_WI;
95	break;
96	case SND_SOC_DAIFMT_IB_IF:
97	break;
98	default:
99	goto out;
100	}
101
102	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
103	case SND_SOC_DAIFMT_CBM_CFM: /* CODEC master */
104	ct \|= PSC_I2SCFG_MS; /* PSC I2S slave mode */
105	break;
106	case SND_SOC_DAIFMT_CBS_CFS: /* CODEC slave */
107	ct &= ~PSC_I2SCFG_MS; /* PSC I2S Master mode */
108	break;
109	default:
110	goto out;
111	}
112
113	pscdata->cfg = ct;
114	ret = 0;
115	out:
116	return ret;
117	}
118
119	static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
dee89c4d MB	120	struct snd_pcm_hw_params *params,
dee89c4d MB	121	struct snd_soc_dai *dai)
4a161d23 ML	122	{
	123	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	124
	125	int cfgbits;
	126	unsigned long stat;
	127
	128	/* check if the PSC is already streaming data */
	129	stat = au_readl(I2S_STAT(pscdata));
	130	if (stat & (PSC_I2SSTAT_TB \| PSC_I2SSTAT_RB)) {
	131	/* reject parameters not currently set up in hardware */
	132	cfgbits = au_readl(I2S_CFG(pscdata));
	133	if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) \|\|
	134	(params_rate(params) != pscdata->rate))
	135	return -EINVAL;
	136	} else {
	137	/* set sample bitdepth */
	138	pscdata->cfg &= ~(0x1f << 4);
	139	pscdata->cfg \|= PSC_I2SCFG_SET_LEN(params->msbits);
	140	/* remember current rate for other stream */
	141	pscdata->rate = params_rate(params);
	142	}
	143	return 0;
	144	}
	145
	146	/* Configure PSC late: on my devel systems the codec is I2S master and
	147	* supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit. ASoC
	148	* uses aggressive PM and switches the codec off when it is not in use
	149	* which also means the PSC unit doesn't get any clocks and is therefore
	150	* dead. That's why this chunk here gets called from the trigger callback
	151	* because I can be reasonably certain the codec is driving the clocks.
	152	*/
	153	static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
	154	{
	155	unsigned long tmo;
	156
	157	/* bring PSC out of sleep, and configure I2S unit */
	158	au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
	159	au_sync();
	160
	161	tmo = 1000000;
	162	while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
	163	tmo--;
	164
	165	if (!tmo)
	166	goto psc_err;
	167
	168	au_writel(0, I2S_CFG(pscdata));
	169	au_sync();
	170	au_writel(pscdata->cfg \| PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
	171	au_sync();
	172
	173	/* wait for I2S controller to become ready */
	174	tmo = 1000000;
	175	while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
	176	tmo--;
	177
	178	if (tmo)
	179	return 0;
	180
	181	psc_err:
	182	au_writel(0, I2S_CFG(pscdata));
	183	au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
	184	au_sync();
	185	return -ETIMEDOUT;
186	}
187
188	static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
189	{
190	unsigned long tmo, stat;
191	int ret;
192
193	ret = 0;
194
195	/* if both TX and RX are idle, configure the PSC */
196	stat = au_readl(I2S_STAT(pscdata));
197	if (!(stat & (PSC_I2SSTAT_TB \| PSC_I2SSTAT_RB))) {
198	ret = au1xpsc_i2s_configure(pscdata);
199	if (ret)
200	goto out;
201	}
202
203	au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
204	au_sync();
205	au_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
206	au_sync();
207
208	/* wait for start confirmation */
209	tmo = 1000000;
210	while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
211	tmo--;
212
213	if (!tmo) {
214	au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
215	au_sync();
216	ret = -ETIMEDOUT;
217	}
218	out:
219	return ret;
220	}
221
222	static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
223	{
224	unsigned long tmo, stat;
225
226	au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
227	au_sync();
228
229	/* wait for stop confirmation */
230	tmo = 1000000;
231	while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
232	tmo--;
233
234	/* if both TX and RX are idle, disable PSC */
235	stat = au_readl(I2S_STAT(pscdata));
2b30a55d	236	if (!(stat & (PSC_I2SSTAT_TB \| PSC_I2SSTAT_RB))) {
4a161d23 ML	237	au_writel(0, I2S_CFG(pscdata));
	238	au_sync();
	239	au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
	240	au_sync();
	241	}
	242	return 0;
	243	}
	244
dee89c4d MB	245	static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
dee89c4d MB	246	struct snd_soc_dai *dai)
4a161d23 ML	247	{
	248	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	249	int ret, stype = SUBSTREAM_TYPE(substream);
	250
	251	switch (cmd) {
	252	case SNDRV_PCM_TRIGGER_START:
	253	case SNDRV_PCM_TRIGGER_RESUME:
	254	ret = au1xpsc_i2s_start(pscdata, stype);
	255	break;
	256	case SNDRV_PCM_TRIGGER_STOP:
	257	case SNDRV_PCM_TRIGGER_SUSPEND:
	258	ret = au1xpsc_i2s_stop(pscdata, stype);
	259	break;
	260	default:
	261	ret = -EINVAL;
	262	}
	263	return ret;
	264	}
	265
	266	static int au1xpsc_i2s_probe(struct platform_device *pdev,
	267	struct snd_soc_dai *dai)
0f83d639 ML	268	{
	269	return au1xpsc_i2s_workdata ? 0 : -ENODEV;
	270	}
	271
	272	static void au1xpsc_i2s_remove(struct platform_device *pdev,
	273	struct snd_soc_dai *dai)
	274	{
	275	}
	276
	277	static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
	278	.trigger = au1xpsc_i2s_trigger,
	279	.hw_params = au1xpsc_i2s_hw_params,
	280	.set_fmt = au1xpsc_i2s_set_fmt,
	281	};
	282
	283	struct snd_soc_dai au1xpsc_i2s_dai = {
	284	.name = "au1xpsc_i2s",
	285	.probe = au1xpsc_i2s_probe,
	286	.remove = au1xpsc_i2s_remove,
	287	.playback = {
	288	.rates = AU1XPSC_I2S_RATES,
	289	.formats = AU1XPSC_I2S_FMTS,
	290	.channels_min = 2,
	291	.channels_max = 8, /* 2 without external help */
	292	},
	293	.capture = {
	294	.rates = AU1XPSC_I2S_RATES,
	295	.formats = AU1XPSC_I2S_FMTS,
	296	.channels_min = 2,
	297	.channels_max = 8, /* 2 without external help */
	298	},
	299	.ops = &au1xpsc_i2s_dai_ops,
	300	};
	301	EXPORT_SYMBOL(au1xpsc_i2s_dai);
	302
	303	static int __init au1xpsc_i2s_drvprobe(struct platform_device *pdev)
4a161d23 ML	304	{
	305	struct resource *r;
	306	unsigned long sel;
	307	int ret;
0f83d639	308	struct au1xpsc_audio_data *wd;
4a161d23 ML	309
	310	if (au1xpsc_i2s_workdata)
	311	return -EBUSY;
	312
0f83d639 ML	313	wd = kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
0f83d639 ML	314	if (!wd)
4a161d23 ML	315	return -ENOMEM;
	316
	317	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	318	if (!r) {
	319	ret = -ENODEV;
	320	goto out0;
	321	}
	322
	323	ret = -EBUSY;
0f83d639	324	wd->ioarea = request_mem_region(r->start, r->end - r->start + 1,
4a161d23	325	"au1xpsc_i2s");
0f83d639	326	if (!wd->ioarea)
4a161d23 ML	327	goto out0;
4a161d23 ML	328
0f83d639 ML	329	wd->mmio = ioremap(r->start, 0xffff);
0f83d639 ML	330	if (!wd->mmio)
4a161d23 ML	331	goto out1;
	332
	333	/* preserve PSC clock source set up by platform (dev.platform_data
	334	* is already occupied by soc layer)
	335	*/
0f83d639 ML	336	sel = au_readl(PSC_SEL(wd)) & PSC_SEL_CLK_MASK;
0f83d639 ML	337	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
4a161d23	338	au_sync();
0f83d639 ML	339	au_writel(PSC_SEL_PS_I2SMODE \| sel, PSC_SEL(wd));
0f83d639 ML	340	au_writel(0, I2S_CFG(wd));
4a161d23 ML	341	au_sync();
	342
	343	/* preconfigure: set max rx/tx fifo depths */
0f83d639	344	wd->cfg \|= PSC_I2SCFG_RT_FIFO8 \| PSC_I2SCFG_TT_FIFO8;
4a161d23 ML	345
	346	/* don't wait for I2S core to become ready now; clocks may not
	347	* be running yet; depending on clock input for PSC a wait might
	348	* time out.
	349	*/
	350
0f83d639 ML	351	ret = snd_soc_register_dai(&au1xpsc_i2s_dai);
	352	if (ret)
	353	goto out1;
4a161d23	354
0f83d639 ML	355	/* finally add the DMA device for this PSC */
	356	wd->dmapd = au1xpsc_pcm_add(pdev);
	357	if (wd->dmapd) {
	358	platform_set_drvdata(pdev, wd);
	359	au1xpsc_i2s_workdata = wd;
	360	return 0;
	361	}
	362
	363	snd_soc_unregister_dai(&au1xpsc_i2s_dai);
4a161d23	364	out1:
0f83d639 ML	365	release_resource(wd->ioarea);
0f83d639 ML	366	kfree(wd->ioarea);
4a161d23	367	out0:
0f83d639	368	kfree(wd);
4a161d23 ML	369	return ret;
	370	}
	371
0f83d639	372	static int __devexit au1xpsc_i2s_drvremove(struct platform_device *pdev)
4a161d23	373	{
0f83d639 ML	374	struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
	375
	376	if (wd->dmapd)
	377	au1xpsc_pcm_destroy(wd->dmapd);
	378
	379	snd_soc_unregister_dai(&au1xpsc_i2s_dai);
	380
	381	au_writel(0, I2S_CFG(wd));
4a161d23	382	au_sync();
0f83d639	383	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
4a161d23 ML	384	au_sync();
4a161d23 ML	385
0f83d639 ML	386	iounmap(wd->mmio);
	387	release_resource(wd->ioarea);
	388	kfree(wd->ioarea);
	389	kfree(wd);
	390
	391	au1xpsc_i2s_workdata = NULL; /* MDEV */
	392
	393	return 0;
4a161d23 ML	394	}
4a161d23 ML	395
0f83d639 ML	396	#ifdef CONFIG_PM
0f83d639 ML	397	static int au1xpsc_i2s_drvsuspend(struct device *dev)
4a161d23	398	{
0f83d639 ML	399	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
0f83d639 ML	400
4a161d23	401	/* save interesting register and disable PSC */
0f83d639	402	wd->pm[0] = au_readl(PSC_SEL(wd));
4a161d23	403
0f83d639	404	au_writel(0, I2S_CFG(wd));
4a161d23	405	au_sync();
0f83d639	406	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
4a161d23 ML	407	au_sync();
	408
	409	return 0;
	410	}
	411
0f83d639	412	static int au1xpsc_i2s_drvresume(struct device *dev)
4a161d23	413	{
0f83d639 ML	414	struct au1xpsc_audio_data *wd = dev_get_drvdata(dev);
0f83d639 ML	415
4a161d23	416	/* select I2S mode and PSC clock */
0f83d639	417	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(wd));
4a161d23	418	au_sync();
0f83d639	419	au_writel(0, PSC_SEL(wd));
4a161d23	420	au_sync();
0f83d639	421	au_writel(wd->pm[0], PSC_SEL(wd));
4a161d23 ML	422	au_sync();
	423
	424	return 0;
	425	}
	426
0f83d639 ML	427	static struct dev_pm_ops au1xpsci2s_pmops = {
	428	.suspend = au1xpsc_i2s_drvsuspend,
	429	.resume = au1xpsc_i2s_drvresume,
6335d055 EM	430	};
6335d055 EM	431
0f83d639 ML	432	#define AU1XPSCI2S_PMOPS &au1xpsci2s_pmops
	433
	434	#else
	435
	436	#define AU1XPSCI2S_PMOPS NULL
	437
	438	#endif
	439
	440	static struct platform_driver au1xpsc_i2s_driver = {
	441	.driver = {
	442	.name = "au1xpsc_i2s",
	443	.owner = THIS_MODULE,
	444	.pm = AU1XPSCI2S_PMOPS,
4a161d23	445	},
0f83d639 ML	446	.probe = au1xpsc_i2s_drvprobe,
0f83d639 ML	447	.remove = __devexit_p(au1xpsc_i2s_drvremove),
4a161d23	448	};
4a161d23	449
0f83d639	450	static int __init au1xpsc_i2s_load(void)
4a161d23 ML	451	{
4a161d23 ML	452	au1xpsc_i2s_workdata = NULL;
0f83d639	453	return platform_driver_register(&au1xpsc_i2s_driver);
4a161d23 ML	454	}
4a161d23 ML	455
0f83d639	456	static void __exit au1xpsc_i2s_unload(void)
4a161d23	457	{
0f83d639	458	platform_driver_unregister(&au1xpsc_i2s_driver);
4a161d23 ML	459	}
4a161d23 ML	460
0f83d639 ML	461	module_init(au1xpsc_i2s_load);
0f83d639 ML	462	module_exit(au1xpsc_i2s_unload);
4a161d23 ML	463
	464	MODULE_LICENSE("GPL");
	465	MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
0f83d639	466	MODULE_AUTHOR("Manuel Lauss");