[mirror_ubuntu-artful-kernel.git] / sound / soc / sh / ssi.c

/*
 * Serial Sound Interface (I2S) support for SH7760/SH7780
 *
 * Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>
 *
 *  licensed under the terms outlined in the file COPYING at the root
 *  of the linux kernel sources.
 *
 * dont forget to set IPSEL/OMSEL register bits (in your board code) to
 * enable SSI output pins!
 */

/*
 * LIMITATIONS:
 *	The SSI unit has only one physical data line, so full duplex is
 *	impossible.  This can be remedied  on the  SH7760 by  using the
 *	other SSI unit for recording; however the SH7780 has only 1 SSI
 *	unit, and its pins are shared with the AC97 unit,  among others.
 *
 * FEATURES:
 *	The SSI features "compressed mode": in this mode it continuously
 *	streams PCM data over the I2S lines and uses LRCK as a handshake
 *	signal.  Can be used to send compressed data (AC3/DTS) to a DSP.
 *	The number of bits sent over the wire in a frame can be adjusted
 *	and can be independent from the actual sample bit depth. This is
 *	useful to support TDM mode codecs like the AD1939 which have a
 *	fixed TDM slot size, regardless of sample resolution.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <asm/io.h>

#define SSICR	0x00
#define SSISR	0x04

#define CR_DMAEN	(1 << 28)
#define CR_CHNL_SHIFT	22
#define CR_CHNL_MASK	(3 << CR_CHNL_SHIFT)
#define CR_DWL_SHIFT	19
#define CR_DWL_MASK	(7 << CR_DWL_SHIFT)
#define CR_SWL_SHIFT	16
#define CR_SWL_MASK	(7 << CR_SWL_SHIFT)
#define CR_SCK_MASTER	(1 << 15)	/* bitclock master bit */
#define CR_SWS_MASTER	(1 << 14)	/* wordselect master bit */
#define CR_SCKP		(1 << 13)	/* I2Sclock polarity */
#define CR_SWSP		(1 << 12)	/* LRCK polarity */
#define CR_SPDP		(1 << 11)
#define CR_SDTA		(1 << 10)	/* i2s alignment (msb/lsb) */
#define CR_PDTA		(1 << 9)	/* fifo data alignment */
#define CR_DEL		(1 << 8)	/* delay data by 1 i2sclk */
#define CR_BREN		(1 << 7)	/* clock gating in burst mode */
#define CR_CKDIV_SHIFT	4
#define CR_CKDIV_MASK	(7 << CR_CKDIV_SHIFT)	/* bitclock divider */
#define CR_MUTE		(1 << 3)	/* SSI mute */
#define CR_CPEN		(1 << 2)	/* compressed mode */
#define CR_TRMD		(1 << 1)	/* transmit/receive select */
#define CR_EN		(1 << 0)	/* enable SSI */

#define SSIREG(reg)	(*(unsigned long *)(ssi->mmio + (reg)))

struct ssi_priv {
	unsigned long mmio;
	unsigned long sysclk;
	int inuse;
} ssi_cpu_data[] = {
#if defined(CONFIG_CPU_SUBTYPE_SH7760)
	{
		.mmio	= 0xFE680000,
	},
	{
		.mmio	= 0xFE690000,
	},
#elif defined(CONFIG_CPU_SUBTYPE_SH7780)
	{
		.mmio	= 0xFFE70000,
	},
#else
#error "Unsupported SuperH SoC"
#endif
};

/*
 * track usage of the SSI; it is simplex-only so prevent attempts of
 * concurrent playback + capture. FIXME: any locking required?
 */
static int ssi_startup(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct ssi_priv *ssi = &ssi_cpu_data[rtd->dai->cpu_dai->id];
	if (ssi->inuse) {
		pr_debug("ssi: already in use!\n");
		return -EBUSY;
	} else
		ssi->inuse = 1;
	return 0;
}

static void ssi_shutdown(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct ssi_priv *ssi = &ssi_cpu_data[rtd->dai->cpu_dai->id];

	ssi->inuse = 0;
}

static int ssi_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct ssi_priv *ssi = &ssi_cpu_data[rtd->dai->cpu_dai->id];

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		SSIREG(SSICR) |= CR_DMAEN | CR_EN;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		SSIREG(SSICR) &= ~(CR_DMAEN | CR_EN);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int ssi_hw_params(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct ssi_priv *ssi = &ssi_cpu_data[rtd->dai->cpu_dai->id];
	unsigned long ssicr = SSIREG(SSICR);
	unsigned int bits, channels, swl, recv, i;

	channels = params_channels(params);
	bits = params->msbits;
	recv = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 0 : 1;

	pr_debug("ssi_hw_params() enter\nssicr was    %08lx\n", ssicr);
	pr_debug("bits: %d channels: %d\n", bits, channels);

	ssicr &= ~(CR_TRMD | CR_CHNL_MASK | CR_DWL_MASK | CR_PDTA |
		   CR_SWL_MASK);

	/* direction (send/receive) */
	if (!recv)
		ssicr |= CR_TRMD;	/* transmit */

	/* channels */
	if ((channels < 2) || (channels > 8) || (channels & 1)) {
		pr_debug("ssi: invalid number of channels\n");
		return -EINVAL;
	}
	ssicr |= ((channels >> 1) - 1) << CR_CHNL_SHIFT;

	/* DATA WORD LENGTH (DWL): databits in audio sample */
	i = 0;
	switch (bits) {
	case 32: ++i;
	case 24: ++i;
	case 22: ++i;
	case 20: ++i;
	case 18: ++i;
	case 16: ++i;
		 ssicr |= i << CR_DWL_SHIFT;
	case 8:	 break;
	default:
		pr_debug("ssi: invalid sample width\n");
		return -EINVAL;
	}

	/*
	 * SYSTEM WORD LENGTH: size in bits of half a frame over the I2S
	 * wires. This is usually bits_per_sample x channels/2;  i.e. in
	 * Stereo mode  the SWL equals DWL.  SWL can  be bigger than the
	 * product of (channels_per_slot x samplebits), e.g.  for codecs
	 * like the AD1939 which  only accept 32bit wide TDM slots.  For
	 * "standard" I2S operation we set SWL = chans / 2 * DWL here.
	 * Waiting for ASoC to get TDM support ;-)
	 */
	if ((bits > 16) && (bits <= 24)) {
		bits = 24;	/* these are padded by the SSI */
		/*ssicr |= CR_PDTA;*/ /* cpu/data endianness ? */
	}
	i = 0;
	swl = (bits * channels) / 2;
	switch (swl) {
	case 256: ++i;
	case 128: ++i;
	case 64:  ++i;
	case 48:  ++i;
	case 32:  ++i;
	case 16:  ++i;
		  ssicr |= i << CR_SWL_SHIFT;
	case 8:   break;
	default:
		pr_debug("ssi: invalid system word length computed\n");
		return -EINVAL;
	}

	SSIREG(SSICR) = ssicr;

	pr_debug("ssi_hw_params() leave\nssicr is now %08lx\n", ssicr);
	return 0;
}

static int ssi_set_sysclk(struct snd_soc_cpu_dai *cpu_dai, int clk_id,
			  unsigned int freq, int dir)
{
	struct ssi_priv *ssi = &ssi_cpu_data[cpu_dai->id];

	ssi->sysclk = freq;

	return 0;
}

/*
 * This divider is used to generate the SSI_SCK (I2S bitclock) from the
 * clock at the HAC_BIT_CLK ("oversampling clock") pin.
 */
static int ssi_set_clkdiv(struct snd_soc_cpu_dai *dai, int did, int div)
{
	struct ssi_priv *ssi = &ssi_cpu_data[dai->id];
	unsigned long ssicr;
	int i;

	i = 0;
	ssicr = SSIREG(SSICR) & ~CR_CKDIV_MASK;
	switch (div) {
	case 16: ++i;
	case 8:  ++i;
	case 4:  ++i;
	case 2:  ++i;
		 SSIREG(SSICR) = ssicr | (i << CR_CKDIV_SHIFT);
	case 1:  break;
	default:
		pr_debug("ssi: invalid sck divider %d\n", div);
		return -EINVAL;
	}

	return 0;
}

static int ssi_set_fmt(struct snd_soc_cpu_dai *dai, unsigned int fmt)
{
	struct ssi_priv *ssi = &ssi_cpu_data[dai->id];
	unsigned long ssicr = SSIREG(SSICR);

	pr_debug("ssi_set_fmt()\nssicr was    0x%08lx\n", ssicr);

	ssicr &= ~(CR_DEL | CR_PDTA | CR_BREN | CR_SWSP | CR_SCKP |
		   CR_SWS_MASTER | CR_SCK_MASTER);

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		ssicr |= CR_DEL | CR_PDTA;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		ssicr |= CR_DEL;
		break;
	default:
		pr_debug("ssi: unsupported format\n");
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
	case SND_SOC_DAIFMT_CONT:
		break;
	case SND_SOC_DAIFMT_GATED:
		ssicr |= CR_BREN;
		break;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		ssicr |= CR_SCKP;	/* sample data at low clkedge */
		break;
	case SND_SOC_DAIFMT_NB_IF:
		ssicr |= CR_SCKP | CR_SWSP;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		break;
	case SND_SOC_DAIFMT_IB_IF:
		ssicr |= CR_SWSP;	/* word select starts low */
		break;
	default:
		pr_debug("ssi: invalid inversion\n");
		return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		break;
	case SND_SOC_DAIFMT_CBS_CFM:
		ssicr |= CR_SCK_MASTER;
		break;
	case SND_SOC_DAIFMT_CBM_CFS:
		ssicr |= CR_SWS_MASTER;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		ssicr |= CR_SWS_MASTER | CR_SCK_MASTER;
		break;
	default:
		pr_debug("ssi: invalid master/slave configuration\n");
		return -EINVAL;
	}

	SSIREG(SSICR) = ssicr;
	pr_debug("ssi_set_fmt() leave\nssicr is now 0x%08lx\n", ssicr);

	return 0;
}

/* the SSI depends on an external clocksource (at HAC_BIT_CLK) even in
 * Master mode,  so really this is board specific;  the SSI can do any
 * rate with the right bitclk and divider settings.
 */
#define SSI_RATES	\
	SNDRV_PCM_RATE_8000_192000

/* the SSI can do 8-32 bit samples, with 8 possible channels */
#define SSI_FMTS	\
	(SNDRV_PCM_FMTBIT_S8      | SNDRV_PCM_FMTBIT_U8      |	\
	 SNDRV_PCM_FMTBIT_S16_LE  | SNDRV_PCM_FMTBIT_U16_LE  |	\
	 SNDRV_PCM_FMTBIT_S20_3LE | SNDRV_PCM_FMTBIT_U20_3LE |	\
	 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_U24_3LE |	\
	 SNDRV_PCM_FMTBIT_S32_LE  | SNDRV_PCM_FMTBIT_U32_LE)

struct snd_soc_cpu_dai sh4_ssi_dai[] = {
{
	.name			= "SSI0",
	.id			= 0,
	.type			= SND_SOC_DAI_I2S,
	.playback = {
		.rates		= SSI_RATES,
		.formats	= SSI_FMTS,
		.channels_min	= 2,
		.channels_max	= 8,
	},
	.capture = {
		.rates		= SSI_RATES,
		.formats	= SSI_FMTS,
		.channels_min	= 2,
		.channels_max	= 8,
	},
	.ops = {
		.startup	= ssi_startup,
		.shutdown	= ssi_shutdown,
		.trigger	= ssi_trigger,
		.hw_params	= ssi_hw_params,
	},
	.dai_ops = {
		.set_sysclk	= ssi_set_sysclk,
		.set_clkdiv	= ssi_set_clkdiv,
		.set_fmt	= ssi_set_fmt,
	},
},
#ifdef CONFIG_CPU_SUBTYPE_SH7760
{
	.name			= "SSI1",
	.id			= 1,
	.type			= SND_SOC_DAI_I2S,
	.playback = {
		.rates		= SSI_RATES,
		.formats	= SSI_FMTS,
		.channels_min	= 2,
		.channels_max	= 8,
	},
	.capture = {
		.rates		= SSI_RATES,
		.formats	= SSI_FMTS,
		.channels_min	= 2,
		.channels_max	= 8,
	},
	.ops = {
		.startup	= ssi_startup,
		.shutdown	= ssi_shutdown,
		.trigger	= ssi_trigger,
		.hw_params	= ssi_hw_params,
	},
	.dai_ops = {
		.set_sysclk	= ssi_set_sysclk,
		.set_clkdiv	= ssi_set_clkdiv,
		.set_fmt	= ssi_set_fmt,
	},
},
#endif
};
EXPORT_SYMBOL_GPL(sh4_ssi_dai);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SuperH onchip SSI (I2S) audio driver");
MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");
Commit	Line	Data
aef3b06a ML	1	/*
	2	* Serial Sound Interface (I2S) support for SH7760/SH7780
	3	*
	4	* Copyright (c) 2007 Manuel Lauss <mano@roarinelk.homelinux.net>
	5	*
	6	* licensed under the terms outlined in the file COPYING at the root
	7	* of the linux kernel sources.
	8	*
	9	* dont forget to set IPSEL/OMSEL register bits (in your board code) to
	10	* enable SSI output pins!
	11	*/
	12
	13	/*
	14	* LIMITATIONS:
	15	* The SSI unit has only one physical data line, so full duplex is
	16	* impossible. This can be remedied on the SH7760 by using the
	17	* other SSI unit for recording; however the SH7780 has only 1 SSI
	18	* unit, and its pins are shared with the AC97 unit, among others.
	19	*
	20	* FEATURES:
	21	* The SSI features "compressed mode": in this mode it continuously
	22	* streams PCM data over the I2S lines and uses LRCK as a handshake
	23	* signal. Can be used to send compressed data (AC3/DTS) to a DSP.
	24	* The number of bits sent over the wire in a frame can be adjusted
	25	* and can be independent from the actual sample bit depth. This is
	26	* useful to support TDM mode codecs like the AD1939 which have a
	27	* fixed TDM slot size, regardless of sample resolution.
	28	*/
	29
	30	#include <linux/init.h>
	31	#include <linux/module.h>
	32	#include <linux/platform_device.h>
	33	#include <sound/driver.h>
	34	#include <sound/core.h>
	35	#include <sound/pcm.h>
	36	#include <sound/initval.h>
	37	#include <sound/soc.h>
	38	#include <asm/io.h>
	39
	40	#define SSICR 0x00
	41	#define SSISR 0x04
	42
	43	#define CR_DMAEN (1 << 28)
	44	#define CR_CHNL_SHIFT 22
	45	#define CR_CHNL_MASK (3 << CR_CHNL_SHIFT)
	46	#define CR_DWL_SHIFT 19
	47	#define CR_DWL_MASK (7 << CR_DWL_SHIFT)
	48	#define CR_SWL_SHIFT 16
	49	#define CR_SWL_MASK (7 << CR_SWL_SHIFT)
	50	#define CR_SCK_MASTER (1 << 15) /* bitclock master bit */
	51	#define CR_SWS_MASTER (1 << 14) /* wordselect master bit */
	52	#define CR_SCKP (1 << 13) /* I2Sclock polarity */
	53	#define CR_SWSP (1 << 12) /* LRCK polarity */
	54	#define CR_SPDP (1 << 11)
	55	#define CR_SDTA (1 << 10) /* i2s alignment (msb/lsb) */
	56	#define CR_PDTA (1 << 9) /* fifo data alignment */
	57	#define CR_DEL (1 << 8) /* delay data by 1 i2sclk */
	58	#define CR_BREN (1 << 7) /* clock gating in burst mode */
	59	#define CR_CKDIV_SHIFT 4
	60	#define CR_CKDIV_MASK (7 << CR_CKDIV_SHIFT) /* bitclock divider */
	61	#define CR_MUTE (1 << 3) /* SSI mute */
	62	#define CR_CPEN (1 << 2) /* compressed mode */
	63	#define CR_TRMD (1 << 1) /* transmit/receive select */
	64	#define CR_EN (1 << 0) /* enable SSI */
65
66	#define SSIREG(reg) ((unsigned long )(ssi->mmio + (reg)))
67
68	struct ssi_priv {
69	unsigned long mmio;
70	unsigned long sysclk;
71	int inuse;
72	} ssi_cpu_data[] = {
73	#if defined(CONFIG_CPU_SUBTYPE_SH7760)
74	{
75	.mmio = 0xFE680000,
76	},
77	{
78	.mmio = 0xFE690000,
79	},
80	#elif defined(CONFIG_CPU_SUBTYPE_SH7780)
81	{
82	.mmio = 0xFFE70000,
83	},
84	#else
85	#error "Unsupported SuperH SoC"
86	#endif
87	};
88
89	/*
90	* track usage of the SSI; it is simplex-only so prevent attempts of
91	* concurrent playback + capture. FIXME: any locking required?
92	*/
93	static int ssi_startup(struct snd_pcm_substream *substream)
94	{
95	struct snd_soc_pcm_runtime *rtd = substream->private_data;
96	struct ssi_priv *ssi = &ssi_cpu_data[rtd->dai->cpu_dai->id];
97	if (ssi->inuse) {
98	pr_debug("ssi: already in use!\n");
99	return -EBUSY;
100	} else
101	ssi->inuse = 1;
102	return 0;
103	}
104
105	static void ssi_shutdown(struct snd_pcm_substream *substream)
106	{
107	struct snd_soc_pcm_runtime *rtd = substream->private_data;
108	struct ssi_priv *ssi = &ssi_cpu_data[rtd->dai->cpu_dai->id];
109
110	ssi->inuse = 0;
111	}
112
113	static int ssi_trigger(struct snd_pcm_substream *substream, int cmd)
114	{
115	struct snd_soc_pcm_runtime *rtd = substream->private_data;
116	struct ssi_priv *ssi = &ssi_cpu_data[rtd->dai->cpu_dai->id];
117
118	switch (cmd) {
119	case SNDRV_PCM_TRIGGER_START:
120	SSIREG(SSICR) \|= CR_DMAEN \| CR_EN;
121	break;
122	case SNDRV_PCM_TRIGGER_STOP:
123	SSIREG(SSICR) &= ~(CR_DMAEN \| CR_EN);
124	break;
125	default:
126	return -EINVAL;
127	}
128
129	return 0;
130	}
131
132	static int ssi_hw_params(struct snd_pcm_substream *substream,
133	struct snd_pcm_hw_params *params)
134	{
135	struct snd_soc_pcm_runtime *rtd = substream->private_data;
136	struct ssi_priv *ssi = &ssi_cpu_data[rtd->dai->cpu_dai->id];
137	unsigned long ssicr = SSIREG(SSICR);
138	unsigned int bits, channels, swl, recv, i;
139
140	channels = params_channels(params);
141	bits = params->msbits;
142	recv = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? 0 : 1;
143
144	pr_debug("ssi_hw_params() enter\nssicr was %08lx\n", ssicr);
145	pr_debug("bits: %d channels: %d\n", bits, channels);
146
147	ssicr &= ~(CR_TRMD \| CR_CHNL_MASK \| CR_DWL_MASK \| CR_PDTA \|
148	CR_SWL_MASK);
149
150	/* direction (send/receive) */
151	if (!recv)
152	ssicr \|= CR_TRMD; /* transmit */
153
154	/* channels */
155	if ((channels < 2) \|\| (channels > 8) \|\| (channels & 1)) {
156	pr_debug("ssi: invalid number of channels\n");
157	return -EINVAL;
158	}
159	ssicr \|= ((channels >> 1) - 1) << CR_CHNL_SHIFT;
160
161	/* DATA WORD LENGTH (DWL): databits in audio sample */
162	i = 0;
163	switch (bits) {
164	case 32: ++i;
165	case 24: ++i;
166	case 22: ++i;
167	case 20: ++i;
168	case 18: ++i;
169	case 16: ++i;
170	ssicr \|= i << CR_DWL_SHIFT;
171	case 8: break;
172	default:
173	pr_debug("ssi: invalid sample width\n");
174	return -EINVAL;
175	}
176
177	/*
178	* SYSTEM WORD LENGTH: size in bits of half a frame over the I2S
179	* wires. This is usually bits_per_sample x channels/2; i.e. in
180	* Stereo mode the SWL equals DWL. SWL can be bigger than the
181	* product of (channels_per_slot x samplebits), e.g. for codecs
182	* like the AD1939 which only accept 32bit wide TDM slots. For
183	* "standard" I2S operation we set SWL = chans / 2 * DWL here.
184	* Waiting for ASoC to get TDM support ;-)
185	*/
186	if ((bits > 16) && (bits <= 24)) {
187	bits = 24; /* these are padded by the SSI */
188	/ssicr \|= CR_PDTA;/ /* cpu/data endianness ? */
189	}
190	i = 0;
191	swl = (bits * channels) / 2;
192	switch (swl) {
193	case 256: ++i;
194	case 128: ++i;
195	case 64: ++i;
196	case 48: ++i;
197	case 32: ++i;
198	case 16: ++i;
199	ssicr \|= i << CR_SWL_SHIFT;
200	case 8: break;
201	default:
202	pr_debug("ssi: invalid system word length computed\n");
203	return -EINVAL;
204	}
205
206	SSIREG(SSICR) = ssicr;
207
208	pr_debug("ssi_hw_params() leave\nssicr is now %08lx\n", ssicr);
209	return 0;
210	}
211
212	static int ssi_set_sysclk(struct snd_soc_cpu_dai *cpu_dai, int clk_id,
213	unsigned int freq, int dir)
214	{
215	struct ssi_priv *ssi = &ssi_cpu_data[cpu_dai->id];
216
217	ssi->sysclk = freq;
218
219	return 0;
220	}
221
222	/*
223	* This divider is used to generate the SSI_SCK (I2S bitclock) from the
224	* clock at the HAC_BIT_CLK ("oversampling clock") pin.
225	*/
226	static int ssi_set_clkdiv(struct snd_soc_cpu_dai *dai, int did, int div)
227	{
228	struct ssi_priv *ssi = &ssi_cpu_data[dai->id];
229	unsigned long ssicr;
230	int i;
231
232	i = 0;
233	ssicr = SSIREG(SSICR) & ~CR_CKDIV_MASK;
234	switch (div) {
235	case 16: ++i;
236	case 8: ++i;
237	case 4: ++i;
238	case 2: ++i;
239	SSIREG(SSICR) = ssicr \| (i << CR_CKDIV_SHIFT);
240	case 1: break;
241	default:
242	pr_debug("ssi: invalid sck divider %d\n", div);
243	return -EINVAL;
244	}
245
246	return 0;
247	}
248
249	static int ssi_set_fmt(struct snd_soc_cpu_dai *dai, unsigned int fmt)
250	{
251	struct ssi_priv *ssi = &ssi_cpu_data[dai->id];
252	unsigned long ssicr = SSIREG(SSICR);
253
254	pr_debug("ssi_set_fmt()\nssicr was 0x%08lx\n", ssicr);
255
256	ssicr &= ~(CR_DEL \| CR_PDTA \| CR_BREN \| CR_SWSP \| CR_SCKP \|
257	CR_SWS_MASTER \| CR_SCK_MASTER);
258
259	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
260	case SND_SOC_DAIFMT_I2S:
261	break;
262	case SND_SOC_DAIFMT_RIGHT_J:
263	ssicr \|= CR_DEL \| CR_PDTA;
264	break;
265	case SND_SOC_DAIFMT_LEFT_J:
266	ssicr \|= CR_DEL;
267	break;
268	default:
269	pr_debug("ssi: unsupported format\n");
270	return -EINVAL;
271	}
272
273	switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
274	case SND_SOC_DAIFMT_CONT:
275	break;
276	case SND_SOC_DAIFMT_GATED:
277	ssicr \|= CR_BREN;
278	break;
279	}
280
281	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
282	case SND_SOC_DAIFMT_NB_NF:
283	ssicr \|= CR_SCKP; /* sample data at low clkedge */
284	break;
285	case SND_SOC_DAIFMT_NB_IF:
286	ssicr \|= CR_SCKP \| CR_SWSP;
287	break;
288	case SND_SOC_DAIFMT_IB_NF:
289	break;
290	case SND_SOC_DAIFMT_IB_IF:
291	ssicr \|= CR_SWSP; /* word select starts low */
292	break;
293	default:
294	pr_debug("ssi: invalid inversion\n");
295	return -EINVAL;
296	}
297
298	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
299	case SND_SOC_DAIFMT_CBM_CFM:
300	break;
301	case SND_SOC_DAIFMT_CBS_CFM:
302	ssicr \|= CR_SCK_MASTER;
303	break;
304	case SND_SOC_DAIFMT_CBM_CFS:
305	ssicr \|= CR_SWS_MASTER;
306	break;
307	case SND_SOC_DAIFMT_CBS_CFS:
308	ssicr \|= CR_SWS_MASTER \| CR_SCK_MASTER;
309	break;
310	default:
311	pr_debug("ssi: invalid master/slave configuration\n");
312	return -EINVAL;
313	}
314
315	SSIREG(SSICR) = ssicr;
316	pr_debug("ssi_set_fmt() leave\nssicr is now 0x%08lx\n", ssicr);
317
318	return 0;
319	}
320
321	/* the SSI depends on an external clocksource (at HAC_BIT_CLK) even in
322	* Master mode, so really this is board specific; the SSI can do any
323	* rate with the right bitclk and divider settings.
324	*/
325	#define SSI_RATES \
326	SNDRV_PCM_RATE_8000_192000
327
328	/* the SSI can do 8-32 bit samples, with 8 possible channels */
329	#define SSI_FMTS \
330	(SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_U8 \| \
331	SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_U16_LE \| \
332	SNDRV_PCM_FMTBIT_S20_3LE \| SNDRV_PCM_FMTBIT_U20_3LE \| \
333	SNDRV_PCM_FMTBIT_S24_3LE \| SNDRV_PCM_FMTBIT_U24_3LE \| \
334	SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_U32_LE)
335
336	struct snd_soc_cpu_dai sh4_ssi_dai[] = {
337	{
338	.name = "SSI0",
339	.id = 0,
340	.type = SND_SOC_DAI_I2S,
341	.playback = {
342	.rates = SSI_RATES,
343	.formats = SSI_FMTS,
344	.channels_min = 2,
345	.channels_max = 8,
346	},
347	.capture = {
348	.rates = SSI_RATES,
349	.formats = SSI_FMTS,
350	.channels_min = 2,
351	.channels_max = 8,
352	},
353	.ops = {
354	.startup = ssi_startup,
355	.shutdown = ssi_shutdown,
356	.trigger = ssi_trigger,
357	.hw_params = ssi_hw_params,
358	},
359	.dai_ops = {
360	.set_sysclk = ssi_set_sysclk,
361	.set_clkdiv = ssi_set_clkdiv,
362	.set_fmt = ssi_set_fmt,
363	},
364	},
365	#ifdef CONFIG_CPU_SUBTYPE_SH7760
366	{
367	.name = "SSI1",
368	.id = 1,
369	.type = SND_SOC_DAI_I2S,
370	.playback = {
371	.rates = SSI_RATES,
372	.formats = SSI_FMTS,
373	.channels_min = 2,
374	.channels_max = 8,
375	},
376	.capture = {
377	.rates = SSI_RATES,
378	.formats = SSI_FMTS,
379	.channels_min = 2,
380	.channels_max = 8,
381	},
382	.ops = {
383	.startup = ssi_startup,
384	.shutdown = ssi_shutdown,
385	.trigger = ssi_trigger,
386	.hw_params = ssi_hw_params,
387	},
388	.dai_ops = {
389	.set_sysclk = ssi_set_sysclk,
390	.set_clkdiv = ssi_set_clkdiv,
391	.set_fmt = ssi_set_fmt,
392	},
393	},
394	#endif
395	};
396	EXPORT_SYMBOL_GPL(sh4_ssi_dai);
397
398	MODULE_LICENSE("GPL");
399	MODULE_DESCRIPTION("SuperH onchip SSI (I2S) audio driver");
400	MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");