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

/*
 * Au12x0/Au1550 PSC ALSA ASoC audio support.
 *
 * (c) 2007-2008 MSC Vertriebsges.m.b.H.,
 *	Manuel Lauss <mano@roarinelk.homelinux.net>
 *
 * 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/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)
{
	struct resource *r;
	unsigned long sel;
	int ret;

	if (au1xpsc_i2s_workdata)
		return -EBUSY;

	au1xpsc_i2s_workdata =
		kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
	if (!au1xpsc_i2s_workdata)
		return -ENOMEM;

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

	ret = -EBUSY;
	au1xpsc_i2s_workdata->ioarea =
		request_mem_region(r->start, r->end - r->start + 1,
					"au1xpsc_i2s");
	if (!au1xpsc_i2s_workdata->ioarea)
		goto out0;

	au1xpsc_i2s_workdata->mmio = ioremap(r->start, 0xffff);
	if (!au1xpsc_i2s_workdata->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(au1xpsc_i2s_workdata)) & PSC_SEL_CLK_MASK;
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
	au_sync();
	au_writel(PSC_SEL_PS_I2SMODE | sel, PSC_SEL(au1xpsc_i2s_workdata));
	au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
	au_sync();

	/* preconfigure: set max rx/tx fifo depths */
	au1xpsc_i2s_workdata->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.
	 */

	return 0;

out1:
	release_resource(au1xpsc_i2s_workdata->ioarea);
	kfree(au1xpsc_i2s_workdata->ioarea);
out0:
	kfree(au1xpsc_i2s_workdata);
	au1xpsc_i2s_workdata = NULL;
	return ret;
}

static void au1xpsc_i2s_remove(struct platform_device *pdev,
			       struct snd_soc_dai *dai)
{
	au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
	au_sync();
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
	au_sync();

	iounmap(au1xpsc_i2s_workdata->mmio);
	release_resource(au1xpsc_i2s_workdata->ioarea);
	kfree(au1xpsc_i2s_workdata->ioarea);
	kfree(au1xpsc_i2s_workdata);
	au1xpsc_i2s_workdata = NULL;
}

static int au1xpsc_i2s_suspend(struct snd_soc_dai *cpu_dai)
{
	/* save interesting register and disable PSC */
	au1xpsc_i2s_workdata->pm[0] =
		au_readl(PSC_SEL(au1xpsc_i2s_workdata));

	au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
	au_sync();
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
	au_sync();

	return 0;
}

static int au1xpsc_i2s_resume(struct snd_soc_dai *cpu_dai)
{
	/* select I2S mode and PSC clock */
	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
	au_sync();
	au_writel(0, PSC_SEL(au1xpsc_i2s_workdata));
	au_sync();
	au_writel(au1xpsc_i2s_workdata->pm[0],
			PSC_SEL(au1xpsc_i2s_workdata));
	au_sync();

	return 0;
}

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,
	.suspend		= au1xpsc_i2s_suspend,
	.resume			= au1xpsc_i2s_resume,
	.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_init(void)
{
	au1xpsc_i2s_workdata = NULL;
	return snd_soc_register_dai(&au1xpsc_i2s_dai);
}

static void __exit au1xpsc_i2s_exit(void)
{
	snd_soc_unregister_dai(&au1xpsc_i2s_dai);
}

module_init(au1xpsc_i2s_init);
module_exit(au1xpsc_i2s_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");
Commit	Line	Data
4a161d23 ML	1	/*
	2	* Au12x0/Au1550 PSC ALSA ASoC audio support.
	3	*
	4	* (c) 2007-2008 MSC Vertriebsges.m.b.H.,
	5	* Manuel Lauss <mano@roarinelk.homelinux.net>
	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>
	21	#include <linux/suspend.h>
	22	#include <sound/core.h>
	23	#include <sound/pcm.h>
	24	#include <sound/initval.h>
	25	#include <sound/soc.h>
	26	#include <asm/mach-au1x00/au1000.h>
	27	#include <asm/mach-au1x00/au1xxx_psc.h>
	28
	29	#include "psc.h"
	30
	31	/* supported I2S DAI hardware formats */
	32	#define AU1XPSC_I2S_DAIFMT \
	33	(SND_SOC_DAIFMT_I2S \| SND_SOC_DAIFMT_LEFT_J \| \
	34	SND_SOC_DAIFMT_NB_NF)
	35
	36	/* supported I2S direction */
	37	#define AU1XPSC_I2S_DIR \
	38	(SND_SOC_DAIDIR_PLAYBACK \| SND_SOC_DAIDIR_CAPTURE)
	39
	40	#define AU1XPSC_I2S_RATES \
	41	SNDRV_PCM_RATE_8000_192000
	42
	43	#define AU1XPSC_I2S_FMTS \
	44	(SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S24_LE)
	45
	46	#define I2SSTAT_BUSY(stype) \
	47	((stype) == PCM_TX ? PSC_I2SSTAT_TB : PSC_I2SSTAT_RB)
	48	#define I2SPCR_START(stype) \
	49	((stype) == PCM_TX ? PSC_I2SPCR_TS : PSC_I2SPCR_RS)
	50	#define I2SPCR_STOP(stype) \
	51	((stype) == PCM_TX ? PSC_I2SPCR_TP : PSC_I2SPCR_RP)
	52	#define I2SPCR_CLRFIFO(stype) \
	53	((stype) == PCM_TX ? PSC_I2SPCR_TC : PSC_I2SPCR_RC)
	54
	55
	56	/* instance data. There can be only one, MacLeod!!!! */
	57	static struct au1xpsc_audio_data *au1xpsc_i2s_workdata;
	58
	59	static int au1xpsc_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
	60	unsigned int fmt)
	61	{
	62	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	63	unsigned long ct;
	64	int ret;
65
66	ret = -EINVAL;
67
68	ct = pscdata->cfg;
69
70	ct &= ~(PSC_I2SCFG_XM \| PSC_I2SCFG_MLJ); /* left-justified */
71	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
72	case SND_SOC_DAIFMT_I2S:
73	ct \|= PSC_I2SCFG_XM; /* enable I2S mode */
74	break;
75	case SND_SOC_DAIFMT_MSB:
76	break;
77	case SND_SOC_DAIFMT_LSB:
78	ct \|= PSC_I2SCFG_MLJ; /* LSB (right-) justified */
79	break;
80	default:
81	goto out;
82	}
83
84	ct &= ~(PSC_I2SCFG_BI \| PSC_I2SCFG_WI); /* IB-IF */
85	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
86	case SND_SOC_DAIFMT_NB_NF:
87	ct \|= PSC_I2SCFG_BI \| PSC_I2SCFG_WI;
88	break;
89	case SND_SOC_DAIFMT_NB_IF:
90	ct \|= PSC_I2SCFG_BI;
91	break;
92	case SND_SOC_DAIFMT_IB_NF:
93	ct \|= PSC_I2SCFG_WI;
94	break;
95	case SND_SOC_DAIFMT_IB_IF:
96	break;
97	default:
98	goto out;
99	}
100
101	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
102	case SND_SOC_DAIFMT_CBM_CFM: /* CODEC master */
103	ct \|= PSC_I2SCFG_MS; /* PSC I2S slave mode */
104	break;
105	case SND_SOC_DAIFMT_CBS_CFS: /* CODEC slave */
106	ct &= ~PSC_I2SCFG_MS; /* PSC I2S Master mode */
107	break;
108	default:
109	goto out;
110	}
111
112	pscdata->cfg = ct;
113	ret = 0;
114	out:
115	return ret;
116	}
117
118	static int au1xpsc_i2s_hw_params(struct snd_pcm_substream *substream,
dee89c4d MB	119	struct snd_pcm_hw_params *params,
dee89c4d MB	120	struct snd_soc_dai *dai)
4a161d23 ML	121	{
	122	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	123
	124	int cfgbits;
	125	unsigned long stat;
	126
	127	/* check if the PSC is already streaming data */
	128	stat = au_readl(I2S_STAT(pscdata));
	129	if (stat & (PSC_I2SSTAT_TB \| PSC_I2SSTAT_RB)) {
	130	/* reject parameters not currently set up in hardware */
	131	cfgbits = au_readl(I2S_CFG(pscdata));
	132	if ((PSC_I2SCFG_GET_LEN(cfgbits) != params->msbits) \|\|
	133	(params_rate(params) != pscdata->rate))
	134	return -EINVAL;
	135	} else {
	136	/* set sample bitdepth */
	137	pscdata->cfg &= ~(0x1f << 4);
	138	pscdata->cfg \|= PSC_I2SCFG_SET_LEN(params->msbits);
	139	/* remember current rate for other stream */
	140	pscdata->rate = params_rate(params);
	141	}
	142	return 0;
	143	}
	144
	145	/* Configure PSC late: on my devel systems the codec is I2S master and
	146	* supplies the i2sbitclock __AND__ i2sMclk (!) to the PSC unit. ASoC
	147	* uses aggressive PM and switches the codec off when it is not in use
	148	* which also means the PSC unit doesn't get any clocks and is therefore
	149	* dead. That's why this chunk here gets called from the trigger callback
	150	* because I can be reasonably certain the codec is driving the clocks.
	151	*/
	152	static int au1xpsc_i2s_configure(struct au1xpsc_audio_data *pscdata)
	153	{
	154	unsigned long tmo;
	155
	156	/* bring PSC out of sleep, and configure I2S unit */
	157	au_writel(PSC_CTRL_ENABLE, PSC_CTRL(pscdata));
	158	au_sync();
	159
	160	tmo = 1000000;
	161	while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_SR) && tmo)
	162	tmo--;
	163
	164	if (!tmo)
	165	goto psc_err;
	166
	167	au_writel(0, I2S_CFG(pscdata));
	168	au_sync();
	169	au_writel(pscdata->cfg \| PSC_I2SCFG_DE_ENABLE, I2S_CFG(pscdata));
	170	au_sync();
	171
	172	/* wait for I2S controller to become ready */
	173	tmo = 1000000;
	174	while (!(au_readl(I2S_STAT(pscdata)) & PSC_I2SSTAT_DR) && tmo)
	175	tmo--;
	176
	177	if (tmo)
	178	return 0;
	179
	180	psc_err:
	181	au_writel(0, I2S_CFG(pscdata));
	182	au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
	183	au_sync();
	184	return -ETIMEDOUT;
185	}
186
187	static int au1xpsc_i2s_start(struct au1xpsc_audio_data *pscdata, int stype)
188	{
189	unsigned long tmo, stat;
190	int ret;
191
192	ret = 0;
193
194	/* if both TX and RX are idle, configure the PSC */
195	stat = au_readl(I2S_STAT(pscdata));
196	if (!(stat & (PSC_I2SSTAT_TB \| PSC_I2SSTAT_RB))) {
197	ret = au1xpsc_i2s_configure(pscdata);
198	if (ret)
199	goto out;
200	}
201
202	au_writel(I2SPCR_CLRFIFO(stype), I2S_PCR(pscdata));
203	au_sync();
204	au_writel(I2SPCR_START(stype), I2S_PCR(pscdata));
205	au_sync();
206
207	/* wait for start confirmation */
208	tmo = 1000000;
209	while (!(au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
210	tmo--;
211
212	if (!tmo) {
213	au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
214	au_sync();
215	ret = -ETIMEDOUT;
216	}
217	out:
218	return ret;
219	}
220
221	static int au1xpsc_i2s_stop(struct au1xpsc_audio_data *pscdata, int stype)
222	{
223	unsigned long tmo, stat;
224
225	au_writel(I2SPCR_STOP(stype), I2S_PCR(pscdata));
226	au_sync();
227
228	/* wait for stop confirmation */
229	tmo = 1000000;
230	while ((au_readl(I2S_STAT(pscdata)) & I2SSTAT_BUSY(stype)) && tmo)
231	tmo--;
232
233	/* if both TX and RX are idle, disable PSC */
234	stat = au_readl(I2S_STAT(pscdata));
2b30a55d	235	if (!(stat & (PSC_I2SSTAT_TB \| PSC_I2SSTAT_RB))) {
4a161d23 ML	236	au_writel(0, I2S_CFG(pscdata));
	237	au_sync();
	238	au_writel(PSC_CTRL_SUSPEND, PSC_CTRL(pscdata));
	239	au_sync();
	240	}
	241	return 0;
	242	}
	243
dee89c4d MB	244	static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
dee89c4d MB	245	struct snd_soc_dai *dai)
4a161d23 ML	246	{
	247	struct au1xpsc_audio_data *pscdata = au1xpsc_i2s_workdata;
	248	int ret, stype = SUBSTREAM_TYPE(substream);
	249
	250	switch (cmd) {
	251	case SNDRV_PCM_TRIGGER_START:
	252	case SNDRV_PCM_TRIGGER_RESUME:
	253	ret = au1xpsc_i2s_start(pscdata, stype);
	254	break;
	255	case SNDRV_PCM_TRIGGER_STOP:
	256	case SNDRV_PCM_TRIGGER_SUSPEND:
	257	ret = au1xpsc_i2s_stop(pscdata, stype);
	258	break;
	259	default:
	260	ret = -EINVAL;
	261	}
	262	return ret;
	263	}
	264
	265	static int au1xpsc_i2s_probe(struct platform_device *pdev,
	266	struct snd_soc_dai *dai)
	267	{
	268	struct resource *r;
	269	unsigned long sel;
	270	int ret;
	271
	272	if (au1xpsc_i2s_workdata)
	273	return -EBUSY;
	274
	275	au1xpsc_i2s_workdata =
	276	kzalloc(sizeof(struct au1xpsc_audio_data), GFP_KERNEL);
	277	if (!au1xpsc_i2s_workdata)
	278	return -ENOMEM;
	279
	280	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	281	if (!r) {
	282	ret = -ENODEV;
	283	goto out0;
	284	}
	285
	286	ret = -EBUSY;
	287	au1xpsc_i2s_workdata->ioarea =
	288	request_mem_region(r->start, r->end - r->start + 1,
	289	"au1xpsc_i2s");
	290	if (!au1xpsc_i2s_workdata->ioarea)
	291	goto out0;
	292
	293	au1xpsc_i2s_workdata->mmio = ioremap(r->start, 0xffff);
	294	if (!au1xpsc_i2s_workdata->mmio)
	295	goto out1;
	296
	297	/* preserve PSC clock source set up by platform (dev.platform_data
	298	* is already occupied by soc layer)
	299	*/
	300	sel = au_readl(PSC_SEL(au1xpsc_i2s_workdata)) & PSC_SEL_CLK_MASK;
	301	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
	302	au_sync();
	303	au_writel(PSC_SEL_PS_I2SMODE \| sel, PSC_SEL(au1xpsc_i2s_workdata));
	304	au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
	305	au_sync();
	306
	307	/* preconfigure: set max rx/tx fifo depths */
	308	au1xpsc_i2s_workdata->cfg \|=
	309	PSC_I2SCFG_RT_FIFO8 \| PSC_I2SCFG_TT_FIFO8;
310
311	/* don't wait for I2S core to become ready now; clocks may not
312	* be running yet; depending on clock input for PSC a wait might
313	* time out.
314	*/
315
316	return 0;
317
318	out1:
319	release_resource(au1xpsc_i2s_workdata->ioarea);
320	kfree(au1xpsc_i2s_workdata->ioarea);
321	out0:
322	kfree(au1xpsc_i2s_workdata);
323	au1xpsc_i2s_workdata = NULL;
324	return ret;
325	}
326
327	static void au1xpsc_i2s_remove(struct platform_device *pdev,
328	struct snd_soc_dai *dai)
329	{
330	au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
331	au_sync();
332	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
333	au_sync();
334
335	iounmap(au1xpsc_i2s_workdata->mmio);
336	release_resource(au1xpsc_i2s_workdata->ioarea);
337	kfree(au1xpsc_i2s_workdata->ioarea);
338	kfree(au1xpsc_i2s_workdata);
339	au1xpsc_i2s_workdata = NULL;
340	}
341
dc7d7b83	342	static int au1xpsc_i2s_suspend(struct snd_soc_dai *cpu_dai)
4a161d23 ML	343	{
	344	/* save interesting register and disable PSC */
	345	au1xpsc_i2s_workdata->pm[0] =
	346	au_readl(PSC_SEL(au1xpsc_i2s_workdata));
	347
	348	au_writel(0, I2S_CFG(au1xpsc_i2s_workdata));
	349	au_sync();
	350	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
	351	au_sync();
	352
	353	return 0;
	354	}
	355
dc7d7b83	356	static int au1xpsc_i2s_resume(struct snd_soc_dai *cpu_dai)
4a161d23 ML	357	{
	358	/* select I2S mode and PSC clock */
	359	au_writel(PSC_CTRL_DISABLE, PSC_CTRL(au1xpsc_i2s_workdata));
	360	au_sync();
	361	au_writel(0, PSC_SEL(au1xpsc_i2s_workdata));
	362	au_sync();
	363	au_writel(au1xpsc_i2s_workdata->pm[0],
	364	PSC_SEL(au1xpsc_i2s_workdata));
	365	au_sync();
	366
	367	return 0;
	368	}
	369
6335d055 EM	370	static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
	371	.trigger = au1xpsc_i2s_trigger,
	372	.hw_params = au1xpsc_i2s_hw_params,
	373	.set_fmt = au1xpsc_i2s_set_fmt,
	374	};
	375
4a161d23 ML	376	struct snd_soc_dai au1xpsc_i2s_dai = {
4a161d23 ML	377	.name = "au1xpsc_i2s",
4a161d23 ML	378	.probe = au1xpsc_i2s_probe,
	379	.remove = au1xpsc_i2s_remove,
	380	.suspend = au1xpsc_i2s_suspend,
	381	.resume = au1xpsc_i2s_resume,
	382	.playback = {
	383	.rates = AU1XPSC_I2S_RATES,
	384	.formats = AU1XPSC_I2S_FMTS,
	385	.channels_min = 2,
	386	.channels_max = 8, /* 2 without external help */
	387	},
	388	.capture = {
	389	.rates = AU1XPSC_I2S_RATES,
	390	.formats = AU1XPSC_I2S_FMTS,
	391	.channels_min = 2,
	392	.channels_max = 8, /* 2 without external help */
	393	},
6335d055	394	.ops = &au1xpsc_i2s_dai_ops,
4a161d23 ML	395	};
	396	EXPORT_SYMBOL(au1xpsc_i2s_dai);
	397
	398	static int __init au1xpsc_i2s_init(void)
	399	{
	400	au1xpsc_i2s_workdata = NULL;
3f4b783c	401	return snd_soc_register_dai(&au1xpsc_i2s_dai);
4a161d23 ML	402	}
	403
	404	static void __exit au1xpsc_i2s_exit(void)
	405	{
3f4b783c	406	snd_soc_unregister_dai(&au1xpsc_i2s_dai);
4a161d23 ML	407	}
	408
	409	module_init(au1xpsc_i2s_init);
	410	module_exit(au1xpsc_i2s_exit);
	411
	412	MODULE_LICENSE("GPL");
	413	MODULE_DESCRIPTION("Au12x0/Au1550 PSC I2S ALSA ASoC audio driver");
	414	MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");