sound/soc/au1x/ac97c.c - kernel/msm-4.19 - Gitiles

 /*
  * Au1000/Au1500/Au1100 AC97C controller driver for ASoC
  *
  * (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
  *
  * based on the old ALSA driver originally written by
  *			Charles Eidsness <charles@cooper-street.com>
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/delay.h>
 #include <linux/mutex.h>
 #include <linux/platform_device.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 "psc.h"

 /* register offsets and bits */
 #define AC97_CONFIG	0x00
 #define AC97_STATUS	0x04
 #define AC97_DATA	0x08
 #define AC97_CMDRESP	0x0c
 #define AC97_ENABLE	0x10

 #define CFG_RC(x)	(((x) & 0x3ff) << 13)	/* valid rx slots mask */
 #define CFG_XS(x)	(((x) & 0x3ff) << 3)	/* valid tx slots mask */
 #define CFG_SG		(1 << 2)	/* sync gate */
 #define CFG_SN		(1 << 1)	/* sync control */
 #define CFG_RS		(1 << 0)	/* acrst# control */
 #define STAT_XU		(1 << 11)	/* tx underflow */
 #define STAT_XO		(1 << 10)	/* tx overflow */
 #define STAT_RU		(1 << 9)	/* rx underflow */
 #define STAT_RO		(1 << 8)	/* rx overflow */
 #define STAT_RD		(1 << 7)	/* codec ready */
 #define STAT_CP		(1 << 6)	/* command pending */
 #define STAT_TE		(1 << 4)	/* tx fifo empty */
 #define STAT_TF		(1 << 3)	/* tx fifo full */
 #define STAT_RE		(1 << 1)	/* rx fifo empty */
 #define STAT_RF		(1 << 0)	/* rx fifo full */
 #define CMD_SET_DATA(x)	(((x) & 0xffff) << 16)
 #define CMD_GET_DATA(x)	((x) & 0xffff)
 #define CMD_READ	(1 << 7)
 #define CMD_WRITE	(0 << 7)
 #define CMD_IDX(x)	((x) & 0x7f)
 #define EN_D		(1 << 1)	/* DISable bit */
 #define EN_CE		(1 << 0)	/* clock enable bit */

 /* how often to retry failed codec register reads/writes */
 #define AC97_RW_RETRIES	5

 #define AC97_RATES	\
 	SNDRV_PCM_RATE_CONTINUOUS

 #define AC97_FMTS	\
 	(SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE)

 /* instance data. There can be only one, MacLeod!!!!, fortunately there IS only
  * once AC97C on early Alchemy chips. The newer ones aren't so lucky.
  */
 static struct au1xpsc_audio_data *ac97c_workdata;
 #define ac97_to_ctx(x)		ac97c_workdata

 static inline unsigned long RD(struct au1xpsc_audio_data *ctx, int reg)
 {
 	return __raw_readl(ctx->mmio + reg);
 }

 static inline void WR(struct au1xpsc_audio_data *ctx, int reg, unsigned long v)
 {
 	__raw_writel(v, ctx->mmio + reg);
 	wmb();
 }

 static unsigned short au1xac97c_ac97_read(struct snd_ac97 *ac97,
 					  unsigned short r)
 {
 	struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
 	unsigned int tmo, retry;
 	unsigned long data;

 	data = ~0;
 	retry = AC97_RW_RETRIES;
 	do {
 		mutex_lock(&ctx->lock);

 		tmo = 5;
 		while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
 			udelay(21);	/* wait an ac97 frame time */
 		if (!tmo) {
 			pr_debug("ac97rd timeout #1\n");
 			goto next;
 		}

 		WR(ctx, AC97_CMDRESP, CMD_IDX(r) | CMD_READ);

 		/* stupid errata: data is only valid for 21us, so
 		 * poll, Forrest, poll...
 		 */
 		tmo = 0x10000;
 		while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
 			asm volatile ("nop");
 		data = RD(ctx, AC97_CMDRESP);

 		if (!tmo)
 			pr_debug("ac97rd timeout #2\n");

 next:
 		mutex_unlock(&ctx->lock);
 	} while (--retry && !tmo);

 	pr_debug("AC97RD %04x %04lx %d\n", r, data, retry);

 	return retry ? data & 0xffff : 0xffff;
 }

 static void au1xac97c_ac97_write(struct snd_ac97 *ac97, unsigned short r,
 				 unsigned short v)
 {
 	struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
 	unsigned int tmo, retry;

 	retry = AC97_RW_RETRIES;
 	do {
 		mutex_lock(&ctx->lock);

 		for (tmo = 5; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--)
 			udelay(21);
 		if (!tmo) {
 			pr_debug("ac97wr timeout #1\n");
 			goto next;
 		}

 		WR(ctx, AC97_CMDRESP, CMD_WRITE | CMD_IDX(r) | CMD_SET_DATA(v));

 		for (tmo = 10; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--)
 			udelay(21);
 		if (!tmo)
 			pr_debug("ac97wr timeout #2\n");
 next:
 		mutex_unlock(&ctx->lock);
 	} while (--retry && !tmo);

 	pr_debug("AC97WR %04x %04x %d\n", r, v, retry);
 }

 static void au1xac97c_ac97_warm_reset(struct snd_ac97 *ac97)
 {
 	struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);

 	WR(ctx, AC97_CONFIG, ctx->cfg | CFG_SG | CFG_SN);
 	msleep(20);
 	WR(ctx, AC97_CONFIG, ctx->cfg | CFG_SG);
 	WR(ctx, AC97_CONFIG, ctx->cfg);
 }

 static void au1xac97c_ac97_cold_reset(struct snd_ac97 *ac97)
 {
 	struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
 	int i;

 	WR(ctx, AC97_CONFIG, ctx->cfg | CFG_RS);
 	msleep(500);
 	WR(ctx, AC97_CONFIG, ctx->cfg);

 	/* wait for codec ready */
 	i = 50;
 	while (((RD(ctx, AC97_STATUS) & STAT_RD) == 0) && --i)
 		msleep(20);
 	if (!i)
 		printk(KERN_ERR "ac97c: codec not ready after cold reset\n");
 }

 /* AC97 controller operations */
 static struct snd_ac97_bus_ops ac97c_bus_ops = {
 	.read		= au1xac97c_ac97_read,
 	.write		= au1xac97c_ac97_write,
 	.reset		= au1xac97c_ac97_cold_reset,
 	.warm_reset	= au1xac97c_ac97_warm_reset,
 };

 static int alchemy_ac97c_startup(struct snd_pcm_substream *substream,
 				 struct snd_soc_dai *dai)
 {
 	struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
 	snd_soc_dai_set_dma_data(dai, substream, &ctx->dmaids[0]);
 	return 0;
 }

 static const struct snd_soc_dai_ops alchemy_ac97c_ops = {
 	.startup		= alchemy_ac97c_startup,
 };

 static int au1xac97c_dai_probe(struct snd_soc_dai *dai)
 {
 	return ac97c_workdata ? 0 : -ENODEV;
 }

 static struct snd_soc_dai_driver au1xac97c_dai_driver = {
 	.name			= "alchemy-ac97c",
 	.bus_control		= true,
 	.probe			= au1xac97c_dai_probe,
 	.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			= &alchemy_ac97c_ops,
 };

 static const struct snd_soc_component_driver au1xac97c_component = {
 	.name		= "au1xac97c",
 };

 static int au1xac97c_drvprobe(struct platform_device *pdev)
 {
 	int ret;
 	struct resource *iores, *dmares;
 	struct au1xpsc_audio_data *ctx;

 	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;

 	mutex_init(&ctx->lock);

 	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!iores)
 		return -ENODEV;

 	if (!devm_request_mem_region(&pdev->dev, iores->start,
 				     resource_size(iores),
 				     pdev->name))
 		return -EBUSY;

 	ctx->mmio = devm_ioremap_nocache(&pdev->dev, iores->start,
 					 resource_size(iores));
 	if (!ctx->mmio)
 		return -EBUSY;

 	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 	if (!dmares)
 		return -EBUSY;
 	ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;

 	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 	if (!dmares)
 		return -EBUSY;
 	ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;

 	/* switch it on */
 	WR(ctx, AC97_ENABLE, EN_D | EN_CE);
 	WR(ctx, AC97_ENABLE, EN_CE);

 	ctx->cfg = CFG_RC(3) | CFG_XS(3);
 	WR(ctx, AC97_CONFIG, ctx->cfg);

 	platform_set_drvdata(pdev, ctx);

 	ret = snd_soc_set_ac97_ops(&ac97c_bus_ops);
 	if (ret)
 		return ret;

 	ret = snd_soc_register_component(&pdev->dev, &au1xac97c_component,
 					 &au1xac97c_dai_driver, 1);
 	if (ret)
 		return ret;

 	ac97c_workdata = ctx;
 	return 0;
 }

 static int au1xac97c_drvremove(struct platform_device *pdev)
 {
 	struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev);

 	snd_soc_unregister_component(&pdev->dev);

 	WR(ctx, AC97_ENABLE, EN_D);	/* clock off, disable */

 	ac97c_workdata = NULL;	/* MDEV */

 	return 0;
 }

 #ifdef CONFIG_PM
 static int au1xac97c_drvsuspend(struct device *dev)
 {
 	struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);

 	WR(ctx, AC97_ENABLE, EN_D);	/* clock off, disable */

 	return 0;
 }

 static int au1xac97c_drvresume(struct device *dev)
 {
 	struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);

 	WR(ctx, AC97_ENABLE, EN_D | EN_CE);
 	WR(ctx, AC97_ENABLE, EN_CE);
 	WR(ctx, AC97_CONFIG, ctx->cfg);

 	return 0;
 }

 static const struct dev_pm_ops au1xpscac97_pmops = {
 	.suspend	= au1xac97c_drvsuspend,
 	.resume		= au1xac97c_drvresume,
 };

 #define AU1XPSCAC97_PMOPS (&au1xpscac97_pmops)

 #else

 #define AU1XPSCAC97_PMOPS NULL

 #endif

 static struct platform_driver au1xac97c_driver = {
 	.driver	= {
 		.name	= "alchemy-ac97c",
 		.pm	= AU1XPSCAC97_PMOPS,
 	},
 	.probe		= au1xac97c_drvprobe,
 	.remove		= au1xac97c_drvremove,
 };

 module_platform_driver(au1xac97c_driver);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Au1000/1500/1100 AC97C ASoC driver");
 MODULE_AUTHOR("Manuel Lauss");
	/*
	* Au1000/Au1500/Au1100 AC97C controller driver for ASoC
	*
	* (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
	*
	* based on the old ALSA driver originally written by
	* Charles Eidsness <charles@cooper-street.com>
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/device.h>
	#include <linux/delay.h>
	#include <linux/mutex.h>
	#include <linux/platform_device.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 "psc.h"

	/* register offsets and bits */
	#define AC97_CONFIG 0x00
	#define AC97_STATUS 0x04
	#define AC97_DATA 0x08
	#define AC97_CMDRESP 0x0c
	#define AC97_ENABLE 0x10

	#define CFG_RC(x) (((x) & 0x3ff) << 13) /* valid rx slots mask */
	#define CFG_XS(x) (((x) & 0x3ff) << 3) /* valid tx slots mask */
	#define CFG_SG (1 << 2) /* sync gate */
	#define CFG_SN (1 << 1) /* sync control */
	#define CFG_RS (1 << 0) /* acrst# control */
	#define STAT_XU (1 << 11) /* tx underflow */
	#define STAT_XO (1 << 10) /* tx overflow */
	#define STAT_RU (1 << 9) /* rx underflow */
	#define STAT_RO (1 << 8) /* rx overflow */
	#define STAT_RD (1 << 7) /* codec ready */
	#define STAT_CP (1 << 6) /* command pending */
	#define STAT_TE (1 << 4) /* tx fifo empty */
	#define STAT_TF (1 << 3) /* tx fifo full */
	#define STAT_RE (1 << 1) /* rx fifo empty */
	#define STAT_RF (1 << 0) /* rx fifo full */
	#define CMD_SET_DATA(x) (((x) & 0xffff) << 16)
	#define CMD_GET_DATA(x) ((x) & 0xffff)
	#define CMD_READ (1 << 7)
	#define CMD_WRITE (0 << 7)
	#define CMD_IDX(x) ((x) & 0x7f)
	#define EN_D (1 << 1) /* DISable bit */
	#define EN_CE (1 << 0) /* clock enable bit */

	/* how often to retry failed codec register reads/writes */
	#define AC97_RW_RETRIES 5

	#define AC97_RATES \
	SNDRV_PCM_RATE_CONTINUOUS

	#define AC97_FMTS \
	(SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S16_BE)

	/* instance data. There can be only one, MacLeod!!!!, fortunately there IS only
	* once AC97C on early Alchemy chips. The newer ones aren't so lucky.
	*/
	static struct au1xpsc_audio_data *ac97c_workdata;
	#define ac97_to_ctx(x) ac97c_workdata

	static inline unsigned long RD(struct au1xpsc_audio_data *ctx, int reg)
	{
	return __raw_readl(ctx->mmio + reg);
	}

	static inline void WR(struct au1xpsc_audio_data *ctx, int reg, unsigned long v)
	{
	__raw_writel(v, ctx->mmio + reg);
	wmb();
	}

	static unsigned short au1xac97c_ac97_read(struct snd_ac97 *ac97,
	unsigned short r)
	{
	struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
	unsigned int tmo, retry;
	unsigned long data;

	data = ~0;
	retry = AC97_RW_RETRIES;
	do {
	mutex_lock(&ctx->lock);

	tmo = 5;
	while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
	udelay(21); /* wait an ac97 frame time */
	if (!tmo) {
	pr_debug("ac97rd timeout #1\n");
	goto next;
	}

	WR(ctx, AC97_CMDRESP, CMD_IDX(r) \| CMD_READ);

	/* stupid errata: data is only valid for 21us, so
	* poll, Forrest, poll...
	*/
	tmo = 0x10000;
	while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
	asm volatile ("nop");
	data = RD(ctx, AC97_CMDRESP);

	if (!tmo)
	pr_debug("ac97rd timeout #2\n");

	next:
	mutex_unlock(&ctx->lock);
	} while (--retry && !tmo);

	pr_debug("AC97RD %04x %04lx %d\n", r, data, retry);

	return retry ? data & 0xffff : 0xffff;
	}

	static void au1xac97c_ac97_write(struct snd_ac97 *ac97, unsigned short r,
	unsigned short v)
	{
	struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
	unsigned int tmo, retry;

	retry = AC97_RW_RETRIES;
	do {
	mutex_lock(&ctx->lock);

	for (tmo = 5; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--)
	udelay(21);
	if (!tmo) {
	pr_debug("ac97wr timeout #1\n");
	goto next;
	}

	WR(ctx, AC97_CMDRESP, CMD_WRITE \| CMD_IDX(r) \| CMD_SET_DATA(v));

	for (tmo = 10; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--)
	udelay(21);
	if (!tmo)
	pr_debug("ac97wr timeout #2\n");
	next:
	mutex_unlock(&ctx->lock);
	} while (--retry && !tmo);

	pr_debug("AC97WR %04x %04x %d\n", r, v, retry);
	}

	static void au1xac97c_ac97_warm_reset(struct snd_ac97 *ac97)
	{
	struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);

	WR(ctx, AC97_CONFIG, ctx->cfg \| CFG_SG \| CFG_SN);
	msleep(20);
	WR(ctx, AC97_CONFIG, ctx->cfg \| CFG_SG);
	WR(ctx, AC97_CONFIG, ctx->cfg);
	}

	static void au1xac97c_ac97_cold_reset(struct snd_ac97 *ac97)
	{
	struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
	int i;

	WR(ctx, AC97_CONFIG, ctx->cfg \| CFG_RS);
	msleep(500);
	WR(ctx, AC97_CONFIG, ctx->cfg);

	/* wait for codec ready */
	i = 50;
	while (((RD(ctx, AC97_STATUS) & STAT_RD) == 0) && --i)
	msleep(20);
	if (!i)
	printk(KERN_ERR "ac97c: codec not ready after cold reset\n");
	}

	/* AC97 controller operations */
	static struct snd_ac97_bus_ops ac97c_bus_ops = {
	.read = au1xac97c_ac97_read,
	.write = au1xac97c_ac97_write,
	.reset = au1xac97c_ac97_cold_reset,
	.warm_reset = au1xac97c_ac97_warm_reset,
	};

	static int alchemy_ac97c_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
	snd_soc_dai_set_dma_data(dai, substream, &ctx->dmaids[0]);
	return 0;
	}

	static const struct snd_soc_dai_ops alchemy_ac97c_ops = {
	.startup = alchemy_ac97c_startup,
	};

	static int au1xac97c_dai_probe(struct snd_soc_dai *dai)
	{
	return ac97c_workdata ? 0 : -ENODEV;
	}

	static struct snd_soc_dai_driver au1xac97c_dai_driver = {
	.name = "alchemy-ac97c",
	.bus_control = true,
	.probe = au1xac97c_dai_probe,
	.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 = &alchemy_ac97c_ops,
	};

	static const struct snd_soc_component_driver au1xac97c_component = {
	.name = "au1xac97c",
	};

	static int au1xac97c_drvprobe(struct platform_device *pdev)
	{
	int ret;
	struct resource iores, dmares;
	struct au1xpsc_audio_data *ctx;

	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
	return -ENOMEM;

	mutex_init(&ctx->lock);

	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!iores)
	return -ENODEV;

	if (!devm_request_mem_region(&pdev->dev, iores->start,
	resource_size(iores),
	pdev->name))
	return -EBUSY;

	ctx->mmio = devm_ioremap_nocache(&pdev->dev, iores->start,
	resource_size(iores));
	if (!ctx->mmio)
	return -EBUSY;

	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!dmares)
	return -EBUSY;
	ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = dmares->start;

	dmares = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	if (!dmares)
	return -EBUSY;
	ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = dmares->start;

	/* switch it on */
	WR(ctx, AC97_ENABLE, EN_D \| EN_CE);
	WR(ctx, AC97_ENABLE, EN_CE);

	ctx->cfg = CFG_RC(3) \| CFG_XS(3);
	WR(ctx, AC97_CONFIG, ctx->cfg);

	platform_set_drvdata(pdev, ctx);

	ret = snd_soc_set_ac97_ops(&ac97c_bus_ops);
	if (ret)
	return ret;

	ret = snd_soc_register_component(&pdev->dev, &au1xac97c_component,
	&au1xac97c_dai_driver, 1);
	if (ret)
	return ret;

	ac97c_workdata = ctx;
	return 0;
	}

	static int au1xac97c_drvremove(struct platform_device *pdev)
	{
	struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev);

	snd_soc_unregister_component(&pdev->dev);

	WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */

	ac97c_workdata = NULL; /* MDEV */

	return 0;
	}

	#ifdef CONFIG_PM
	static int au1xac97c_drvsuspend(struct device *dev)
	{
	struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);

	WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */

	return 0;
	}

	static int au1xac97c_drvresume(struct device *dev)
	{
	struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);

	WR(ctx, AC97_ENABLE, EN_D \| EN_CE);
	WR(ctx, AC97_ENABLE, EN_CE);
	WR(ctx, AC97_CONFIG, ctx->cfg);

	return 0;
	}

	static const struct dev_pm_ops au1xpscac97_pmops = {
	.suspend = au1xac97c_drvsuspend,
	.resume = au1xac97c_drvresume,
	};

	#define AU1XPSCAC97_PMOPS (&au1xpscac97_pmops)

	#else

	#define AU1XPSCAC97_PMOPS NULL

	#endif

	static struct platform_driver au1xac97c_driver = {
	.driver = {
	.name = "alchemy-ac97c",
	.pm = AU1XPSCAC97_PMOPS,
	},
	.probe = au1xac97c_drvprobe,
	.remove = au1xac97c_drvremove,
	};

	module_platform_driver(au1xac97c_driver);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("Au1000/1500/1100 AC97C ASoC driver");
	MODULE_AUTHOR("Manuel Lauss");