sound/soc/sh/hac.c - kernel/msm-4.9 - Gitiles

 /*
  * Hitachi Audio Controller (AC97) 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 HAC output pins!
  */

 /* BIG FAT FIXME: although the SH7760 has 2 independent AC97 units, only
  * the FIRST can be used since ASoC does not pass any information to the
  * ac97_read/write() functions regarding WHICH unit to use.  You'll have
  * to edit the code a bit to use the other AC97 unit.		--mlau
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/wait.h>
 #include <linux/delay.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/ac97_codec.h>
 #include <sound/initval.h>
 #include <sound/soc.h>

 /* regs and bits */
 #define HACCR		0x08
 #define HACCSAR		0x20
 #define HACCSDR		0x24
 #define HACPCML		0x28
 #define HACPCMR		0x2C
 #define HACTIER		0x50
 #define	HACTSR		0x54
 #define HACRIER		0x58
 #define HACRSR		0x5C
 #define HACACR		0x60

 #define CR_CR		(1 << 15)	/* "codec-ready" indicator */
 #define CR_CDRT		(1 << 11)	/* cold reset */
 #define CR_WMRT		(1 << 10)	/* warm reset */
 #define CR_B9		(1 << 9)	/* the mysterious "bit 9" */
 #define CR_ST		(1 << 5)	/* AC97 link start bit */

 #define CSAR_RD		(1 << 19)	/* AC97 data read bit */
 #define CSAR_WR		(0)

 #define TSR_CMDAMT	(1 << 31)
 #define TSR_CMDDMT	(1 << 30)

 #define RSR_STARY	(1 << 22)
 #define RSR_STDRY	(1 << 21)

 #define ACR_DMARX16	(1 << 30)
 #define ACR_DMATX16	(1 << 29)
 #define ACR_TX12ATOM	(1 << 26)
 #define ACR_DMARX20	((1 << 24) | (1 << 22))
 #define ACR_DMATX20	((1 << 23) | (1 << 21))

 #define CSDR_SHIFT	4
 #define CSDR_MASK	(0xffff << CSDR_SHIFT)
 #define CSAR_SHIFT	12
 #define CSAR_MASK	(0x7f << CSAR_SHIFT)

 #define AC97_WRITE_RETRY	1
 #define AC97_READ_RETRY		5

 /* manual-suggested AC97 codec access timeouts (us) */
 #define TMO_E1	500	/* 21 < E1 < 1000 */
 #define TMO_E2	13	/* 13 < E2 */
 #define TMO_E3	21	/* 21 < E3 */
 #define TMO_E4	500	/* 21 < E4 < 1000 */

 struct hac_priv {
 	unsigned long mmio;	/* HAC base address */
 } hac_cpu_data[] = {
 #if defined(CONFIG_CPU_SUBTYPE_SH7760)
 	{
 		.mmio	= 0xFE240000,
 	},
 	{
 		.mmio	= 0xFE250000,
 	},
 #elif defined(CONFIG_CPU_SUBTYPE_SH7780)
 	{
 		.mmio	= 0xFFE40000,
 	},
 #else
 #error "Unsupported SuperH SoC"
 #endif
 };

 #define HACREG(reg)	(*(unsigned long *)(hac->mmio + (reg)))

 /*
  * AC97 read/write flow as outlined in the SH7760 manual (pages 903-906)
  */
 static int hac_get_codec_data(struct hac_priv *hac, unsigned short r,
 			      unsigned short *v)
 {
 	unsigned int to1, to2, i;
 	unsigned short adr;

 	for (i = AC97_READ_RETRY; i; i--) {
 		*v = 0;
 		/* wait for HAC to receive something from the codec */
 		for (to1 = TMO_E4;
 		     to1 && !(HACREG(HACRSR) & RSR_STARY);
 		     --to1)
 			udelay(1);
 		for (to2 = TMO_E4;
 		     to2 && !(HACREG(HACRSR) & RSR_STDRY);
 		     --to2)
 			udelay(1);

 		if (!to1 && !to2)
 			return 0;	/* codec comm is down */

 		adr = ((HACREG(HACCSAR) & CSAR_MASK) >> CSAR_SHIFT);
 		*v  = ((HACREG(HACCSDR) & CSDR_MASK) >> CSDR_SHIFT);

 		HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY);

 		if (r == adr)
 			break;

 		/* manual says: wait at least 21 usec before retrying */
 		udelay(21);
 	}
 	HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY);
 	return i;
 }

 static unsigned short hac_read_codec_aux(struct hac_priv *hac,
 					 unsigned short reg)
 {
 	unsigned short val;
 	unsigned int i, to;

 	for (i = AC97_READ_RETRY; i; i--) {
 		/* send_read_request */
 		local_irq_disable();
 		HACREG(HACTSR) &= ~(TSR_CMDAMT);
 		HACREG(HACCSAR) = (reg << CSAR_SHIFT) | CSAR_RD;
 		local_irq_enable();

 		for (to = TMO_E3;
 		     to && !(HACREG(HACTSR) & TSR_CMDAMT);
 		     --to)
 			udelay(1);

 		HACREG(HACTSR) &= ~TSR_CMDAMT;
 		val = 0;
 		if (hac_get_codec_data(hac, reg, &val) != 0)
 			break;
 	}

 	return i ? val : ~0;
 }

 static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 			   unsigned short val)
 {
 	int unit_id = 0 /* ac97->private_data */;
 	struct hac_priv *hac = &hac_cpu_data[unit_id];
 	unsigned int i, to;
 	/* write_codec_aux */
 	for (i = AC97_WRITE_RETRY; i; i--) {
 		/* send_write_request */
 		local_irq_disable();
 		HACREG(HACTSR) &= ~(TSR_CMDDMT | TSR_CMDAMT);
 		HACREG(HACCSDR) = (val << CSDR_SHIFT);
 		HACREG(HACCSAR) = (reg << CSAR_SHIFT) & (~CSAR_RD);
 		local_irq_enable();

 		/* poll-wait for CMDAMT and CMDDMT */
 		for (to = TMO_E1;
 		     to && !(HACREG(HACTSR) & (TSR_CMDAMT|TSR_CMDDMT));
 		     --to)
 			udelay(1);

 		HACREG(HACTSR) &= ~(TSR_CMDAMT | TSR_CMDDMT);
 		if (to)
 			break;
 		/* timeout, try again */
 	}
 }

 static unsigned short hac_ac97_read(struct snd_ac97 *ac97,
 				    unsigned short reg)
 {
 	int unit_id = 0 /* ac97->private_data */;
 	struct hac_priv *hac = &hac_cpu_data[unit_id];
 	return hac_read_codec_aux(hac, reg);
 }

 static void hac_ac97_warmrst(struct snd_ac97 *ac97)
 {
 	int unit_id = 0 /* ac97->private_data */;
 	struct hac_priv *hac = &hac_cpu_data[unit_id];
 	unsigned int tmo;

 	HACREG(HACCR) = CR_WMRT | CR_ST | CR_B9;
 	msleep(10);
 	HACREG(HACCR) = CR_ST | CR_B9;
 	for (tmo = 1000; (tmo > 0) && !(HACREG(HACCR) & CR_CR); tmo--)
 		udelay(1);

 	if (!tmo)
 		printk(KERN_INFO "hac: reset: AC97 link down!\n");
 	/* settings this bit lets us have a conversation with codec */
 	HACREG(HACACR) |= ACR_TX12ATOM;
 }

 static void hac_ac97_coldrst(struct snd_ac97 *ac97)
 {
 	int unit_id = 0 /* ac97->private_data */;
 	struct hac_priv *hac;
 	hac = &hac_cpu_data[unit_id];

 	HACREG(HACCR) = 0;
 	HACREG(HACCR) = CR_CDRT | CR_ST | CR_B9;
 	msleep(10);
 	hac_ac97_warmrst(ac97);
 }

 struct snd_ac97_bus_ops soc_ac97_ops = {
 	.read	= hac_ac97_read,
 	.write	= hac_ac97_write,
 	.reset	= hac_ac97_coldrst,
 	.warm_reset = hac_ac97_warmrst,
 };
 EXPORT_SYMBOL_GPL(soc_ac97_ops);

 static int hac_hw_params(struct snd_pcm_substream *substream,
 			 struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct hac_priv *hac = &hac_cpu_data[rtd->dai->cpu_dai->id];
 	int d = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1;

 	switch (params->msbits) {
 	case 16:
 		HACREG(HACACR) |= d ?  ACR_DMARX16 :  ACR_DMATX16;
 		HACREG(HACACR) &= d ? ~ACR_DMARX20 : ~ACR_DMATX20;
 		break;
 	case 20:
 		HACREG(HACACR) &= d ? ~ACR_DMARX16 : ~ACR_DMATX16;
 		HACREG(HACACR) |= d ?  ACR_DMARX20 :  ACR_DMATX20;
 		break;
 	default:
 		pr_debug("hac: invalid depth %d bit\n", params->msbits);
 		return -EINVAL;
 		break;
 	}

 	return 0;
 }

 #define AC97_RATES	\
 	SNDRV_PCM_RATE_8000_192000

 #define AC97_FMTS	\
 	SNDRV_PCM_FMTBIT_S16_LE

 struct snd_soc_dai sh4_hac_dai[] = {
 {
 	.name			= "HAC0",
 	.id			= 0,
 	.type			= SND_SOC_DAI_AC97,
 	.playback = {
 		.rates		= AC97_RATES,
 		.formats	= AC97_FMTS,
 		.channels_min	= 2,
 		.channels_max	= 2,
 	},
 	.capture = {
 		.rates		= AC97_RATES,
 		.formats	= AC97_FMTS,
 		.channels_min	= 2,
 		.channels_max	= 2,
 	},
 	.ops = {
 		.hw_params	= hac_hw_params,
 	},
 },
 #ifdef CONFIG_CPU_SUBTYPE_SH7760
 {
 	.name			= "HAC1",
 	.id			= 1,
 	.type			= SND_SOC_DAI_AC97,
 	.playback = {
 		.rates		= AC97_RATES,
 		.formats	= AC97_FMTS,
 		.channels_min	= 2,
 		.channels_max	= 2,
 	},
 	.capture = {
 		.rates		= AC97_RATES,
 		.formats	= AC97_FMTS,
 		.channels_min	= 2,
 		.channels_max	= 2,
 	},
 	.ops = {
 		.hw_params	= hac_hw_params,
 	},

 },
 #endif
 };
 EXPORT_SYMBOL_GPL(sh4_hac_dai);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver");
 MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");
	/*
	* Hitachi Audio Controller (AC97) 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 HAC output pins!
	*/

	/* BIG FAT FIXME: although the SH7760 has 2 independent AC97 units, only
	* the FIRST can be used since ASoC does not pass any information to the
	* ac97_read/write() functions regarding WHICH unit to use. You'll have
	* to edit the code a bit to use the other AC97 unit. --mlau
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/wait.h>
	#include <linux/delay.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/ac97_codec.h>
	#include <sound/initval.h>
	#include <sound/soc.h>

	/* regs and bits */
	#define HACCR 0x08
	#define HACCSAR 0x20
	#define HACCSDR 0x24
	#define HACPCML 0x28
	#define HACPCMR 0x2C
	#define HACTIER 0x50
	#define HACTSR 0x54
	#define HACRIER 0x58
	#define HACRSR 0x5C
	#define HACACR 0x60

	#define CR_CR (1 << 15) /* "codec-ready" indicator */
	#define CR_CDRT (1 << 11) /* cold reset */
	#define CR_WMRT (1 << 10) /* warm reset */
	#define CR_B9 (1 << 9) /* the mysterious "bit 9" */
	#define CR_ST (1 << 5) /* AC97 link start bit */

	#define CSAR_RD (1 << 19) /* AC97 data read bit */
	#define CSAR_WR (0)

	#define TSR_CMDAMT (1 << 31)
	#define TSR_CMDDMT (1 << 30)

	#define RSR_STARY (1 << 22)
	#define RSR_STDRY (1 << 21)

	#define ACR_DMARX16 (1 << 30)
	#define ACR_DMATX16 (1 << 29)
	#define ACR_TX12ATOM (1 << 26)
	#define ACR_DMARX20 ((1 << 24) \| (1 << 22))
	#define ACR_DMATX20 ((1 << 23) \| (1 << 21))

	#define CSDR_SHIFT 4
	#define CSDR_MASK (0xffff << CSDR_SHIFT)
	#define CSAR_SHIFT 12
	#define CSAR_MASK (0x7f << CSAR_SHIFT)

	#define AC97_WRITE_RETRY 1
	#define AC97_READ_RETRY 5

	/* manual-suggested AC97 codec access timeouts (us) */
	#define TMO_E1 500 /* 21 < E1 < 1000 */
	#define TMO_E2 13 /* 13 < E2 */
	#define TMO_E3 21 /* 21 < E3 */
	#define TMO_E4 500 /* 21 < E4 < 1000 */

	struct hac_priv {
	unsigned long mmio; /* HAC base address */
	} hac_cpu_data[] = {
	#if defined(CONFIG_CPU_SUBTYPE_SH7760)
	{
	.mmio = 0xFE240000,
	},
	{
	.mmio = 0xFE250000,
	},
	#elif defined(CONFIG_CPU_SUBTYPE_SH7780)
	{
	.mmio = 0xFFE40000,
	},
	#else
	#error "Unsupported SuperH SoC"
	#endif
	};

	#define HACREG(reg) ((unsigned long )(hac->mmio + (reg)))

	/*
	* AC97 read/write flow as outlined in the SH7760 manual (pages 903-906)
	*/
	static int hac_get_codec_data(struct hac_priv *hac, unsigned short r,
	unsigned short *v)
	{
	unsigned int to1, to2, i;
	unsigned short adr;

	for (i = AC97_READ_RETRY; i; i--) {
	*v = 0;
	/* wait for HAC to receive something from the codec */
	for (to1 = TMO_E4;
	to1 && !(HACREG(HACRSR) & RSR_STARY);
	--to1)
	udelay(1);
	for (to2 = TMO_E4;
	to2 && !(HACREG(HACRSR) & RSR_STDRY);
	--to2)
	udelay(1);

	if (!to1 && !to2)
	return 0; /* codec comm is down */

	adr = ((HACREG(HACCSAR) & CSAR_MASK) >> CSAR_SHIFT);
	*v = ((HACREG(HACCSDR) & CSDR_MASK) >> CSDR_SHIFT);

	HACREG(HACRSR) &= ~(RSR_STDRY \| RSR_STARY);

	if (r == adr)
	break;

	/* manual says: wait at least 21 usec before retrying */
	udelay(21);
	}
	HACREG(HACRSR) &= ~(RSR_STDRY \| RSR_STARY);
	return i;
	}

	static unsigned short hac_read_codec_aux(struct hac_priv *hac,
	unsigned short reg)
	{
	unsigned short val;
	unsigned int i, to;

	for (i = AC97_READ_RETRY; i; i--) {
	/* send_read_request */
	local_irq_disable();
	HACREG(HACTSR) &= ~(TSR_CMDAMT);
	HACREG(HACCSAR) = (reg << CSAR_SHIFT) \| CSAR_RD;
	local_irq_enable();

	for (to = TMO_E3;
	to && !(HACREG(HACTSR) & TSR_CMDAMT);
	--to)
	udelay(1);

	HACREG(HACTSR) &= ~TSR_CMDAMT;
	val = 0;
	if (hac_get_codec_data(hac, reg, &val) != 0)
	break;
	}

	return i ? val : ~0;
	}

	static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
	unsigned short val)
	{
	int unit_id = 0 /* ac97->private_data */;
	struct hac_priv *hac = &hac_cpu_data[unit_id];
	unsigned int i, to;
	/* write_codec_aux */
	for (i = AC97_WRITE_RETRY; i; i--) {
	/* send_write_request */
	local_irq_disable();
	HACREG(HACTSR) &= ~(TSR_CMDDMT \| TSR_CMDAMT);
	HACREG(HACCSDR) = (val << CSDR_SHIFT);
	HACREG(HACCSAR) = (reg << CSAR_SHIFT) & (~CSAR_RD);
	local_irq_enable();

	/* poll-wait for CMDAMT and CMDDMT */
	for (to = TMO_E1;
	to && !(HACREG(HACTSR) & (TSR_CMDAMT\|TSR_CMDDMT));
	--to)
	udelay(1);

	HACREG(HACTSR) &= ~(TSR_CMDAMT \| TSR_CMDDMT);
	if (to)
	break;
	/* timeout, try again */
	}
	}

	static unsigned short hac_ac97_read(struct snd_ac97 *ac97,
	unsigned short reg)
	{
	int unit_id = 0 /* ac97->private_data */;
	struct hac_priv *hac = &hac_cpu_data[unit_id];
	return hac_read_codec_aux(hac, reg);
	}

	static void hac_ac97_warmrst(struct snd_ac97 *ac97)
	{
	int unit_id = 0 /* ac97->private_data */;
	struct hac_priv *hac = &hac_cpu_data[unit_id];
	unsigned int tmo;

	HACREG(HACCR) = CR_WMRT \| CR_ST \| CR_B9;
	msleep(10);
	HACREG(HACCR) = CR_ST \| CR_B9;
	for (tmo = 1000; (tmo > 0) && !(HACREG(HACCR) & CR_CR); tmo--)
	udelay(1);

	if (!tmo)
	printk(KERN_INFO "hac: reset: AC97 link down!\n");
	/* settings this bit lets us have a conversation with codec */
	HACREG(HACACR) \|= ACR_TX12ATOM;
	}

	static void hac_ac97_coldrst(struct snd_ac97 *ac97)
	{
	int unit_id = 0 /* ac97->private_data */;
	struct hac_priv *hac;
	hac = &hac_cpu_data[unit_id];

	HACREG(HACCR) = 0;
	HACREG(HACCR) = CR_CDRT \| CR_ST \| CR_B9;
	msleep(10);
	hac_ac97_warmrst(ac97);
	}

	struct snd_ac97_bus_ops soc_ac97_ops = {
	.read = hac_ac97_read,
	.write = hac_ac97_write,
	.reset = hac_ac97_coldrst,
	.warm_reset = hac_ac97_warmrst,
	};
	EXPORT_SYMBOL_GPL(soc_ac97_ops);

	static int hac_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct hac_priv *hac = &hac_cpu_data[rtd->dai->cpu_dai->id];
	int d = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1;

	switch (params->msbits) {
	case 16:
	HACREG(HACACR) \|= d ? ACR_DMARX16 : ACR_DMATX16;
	HACREG(HACACR) &= d ? ~ACR_DMARX20 : ~ACR_DMATX20;
	break;
	case 20:
	HACREG(HACACR) &= d ? ~ACR_DMARX16 : ~ACR_DMATX16;
	HACREG(HACACR) \|= d ? ACR_DMARX20 : ACR_DMATX20;
	break;
	default:
	pr_debug("hac: invalid depth %d bit\n", params->msbits);
	return -EINVAL;
	break;
	}

	return 0;
	}

	#define AC97_RATES \
	SNDRV_PCM_RATE_8000_192000

	#define AC97_FMTS \
	SNDRV_PCM_FMTBIT_S16_LE

	struct snd_soc_dai sh4_hac_dai[] = {
	{
	.name = "HAC0",
	.id = 0,
	.type = SND_SOC_DAI_AC97,
	.playback = {
	.rates = AC97_RATES,
	.formats = AC97_FMTS,
	.channels_min = 2,
	.channels_max = 2,
	},
	.capture = {
	.rates = AC97_RATES,
	.formats = AC97_FMTS,
	.channels_min = 2,
	.channels_max = 2,
	},
	.ops = {
	.hw_params = hac_hw_params,
	},
	},
	#ifdef CONFIG_CPU_SUBTYPE_SH7760
	{
	.name = "HAC1",
	.id = 1,
	.type = SND_SOC_DAI_AC97,
	.playback = {
	.rates = AC97_RATES,
	.formats = AC97_FMTS,
	.channels_min = 2,
	.channels_max = 2,
	},
	.capture = {
	.rates = AC97_RATES,
	.formats = AC97_FMTS,
	.channels_min = 2,
	.channels_max = 2,
	},
	.ops = {
	.hw_params = hac_hw_params,
	},

	},
	#endif
	};
	EXPORT_SYMBOL_GPL(sh4_hac_dai);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("SuperH onchip HAC (AC97) audio driver");
	MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");