sound/soc/txx9/txx9aclc-ac97.c - maze/linux - Git at Google

 /*
  * TXx9 ACLC AC97 driver
  *
  * Copyright (C) 2009 Atsushi Nemoto
  *
  * Based on RBTX49xx patch from CELF patch archive.
  * (C) Copyright TOSHIBA CORPORATION 2004-2006
  *
  * 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.
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/gfp.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/soc.h>
 #include "txx9aclc.h"

 #define AC97_DIR	\
 	(SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)

 #define AC97_RATES	\
 	SNDRV_PCM_RATE_8000_48000

 #ifdef __BIG_ENDIAN
 #define AC97_FMTS	SNDRV_PCM_FMTBIT_S16_BE
 #else
 #define AC97_FMTS	SNDRV_PCM_FMTBIT_S16_LE
 #endif

 static DECLARE_WAIT_QUEUE_HEAD(ac97_waitq);

 /* REVISIT: How to find txx9aclc_soc_device from snd_ac97? */
 static struct txx9aclc_soc_device *txx9aclc_soc_dev;

 static int txx9aclc_regready(struct txx9aclc_soc_device *dev)
 {
 	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);

 	return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY;
 }

 /* AC97 controller reads codec register */
 static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97,
 					 unsigned short reg)
 {
 	struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
 	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 	void __iomem *base = drvdata->base;
 	u32 dat;

 	if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num)))
 		return 0xffff;
 	reg |= ac97->num << 7;
 	dat = (reg << ACREGACC_REG_SHIFT) | ACREGACC_READ;
 	__raw_writel(dat, base + ACREGACC);
 	__raw_writel(ACINT_REGACCRDY, base + ACINTEN);
 	if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
 		__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
 		dev_err(dev->soc_dev.dev, "ac97 read timeout (reg %#x)\n", reg);
 		dat = 0xffff;
 		goto done;
 	}
 	dat = __raw_readl(base + ACREGACC);
 	if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) {
 		dev_err(dev->soc_dev.dev, "reg mismatch %x with %x\n",
 			dat, reg);
 		dat = 0xffff;
 		goto done;
 	}
 	dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff;
 done:
 	__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
 	return dat;
 }

 /* AC97 controller writes to codec register */
 static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 				unsigned short val)
 {
 	struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
 	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 	void __iomem *base = drvdata->base;

 	__raw_writel(((reg | (ac97->num << 7)) << ACREGACC_REG_SHIFT) |
 		     (val << ACREGACC_DAT_SHIFT),
 		     base + ACREGACC);
 	__raw_writel(ACINT_REGACCRDY, base + ACINTEN);
 	if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
 		dev_err(dev->soc_dev.dev,
 			"ac97 write timeout (reg %#x)\n", reg);
 	}
 	__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
 }

 static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
 {
 	struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
 	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
 	void __iomem *base = drvdata->base;
 	u32 ready = ACINT_CODECRDY(ac97->num) | ACINT_REGACCRDY;

 	__raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
 	mmiowb();
 	udelay(1);
 	__raw_writel(ACCTL_ENLINK, base + ACCTLEN);
 	/* wait for primary codec ready status */
 	__raw_writel(ready, base + ACINTEN);
 	if (!wait_event_timeout(ac97_waitq,
 				(__raw_readl(base + ACINTSTS) & ready) == ready,
 				HZ)) {
 		dev_err(&ac97->dev, "primary codec is not ready "
 			"(status %#x)\n",
 			__raw_readl(base + ACINTSTS));
 	}
 	__raw_writel(ACINT_REGACCRDY, base + ACINTSTS);
 	__raw_writel(ready, base + ACINTDIS);
 }

 /* AC97 controller operations */
 struct snd_ac97_bus_ops soc_ac97_ops = {
 	.read		= txx9aclc_ac97_read,
 	.write		= txx9aclc_ac97_write,
 	.reset		= txx9aclc_ac97_cold_reset,
 };
 EXPORT_SYMBOL_GPL(soc_ac97_ops);

 static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
 {
 	struct txx9aclc_plat_drvdata *drvdata = dev_id;
 	void __iomem *base = drvdata->base;

 	__raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS);
 	wake_up(&ac97_waitq);
 	return IRQ_HANDLED;
 }

 static int txx9aclc_ac97_probe(struct platform_device *pdev,
 			       struct snd_soc_dai *dai)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct txx9aclc_soc_device *dev =
 		container_of(socdev, struct txx9aclc_soc_device, soc_dev);

 	dev->aclc_pdev = to_platform_device(dai->dev);
 	txx9aclc_soc_dev = dev;
 	return 0;
 }

 static void txx9aclc_ac97_remove(struct platform_device *pdev,
 				 struct snd_soc_dai *dai)
 {
 	struct platform_device *aclc_pdev = to_platform_device(dai->dev);
 	struct txx9aclc_plat_drvdata *drvdata = platform_get_drvdata(aclc_pdev);

 	/* disable AC-link */
 	__raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS);
 	txx9aclc_soc_dev = NULL;
 }

 struct snd_soc_dai txx9aclc_ac97_dai = {
 	.name			= "txx9aclc_ac97",
 	.ac97_control		= 1,
 	.probe			= txx9aclc_ac97_probe,
 	.remove			= txx9aclc_ac97_remove,
 	.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,
 	},
 };
 EXPORT_SYMBOL_GPL(txx9aclc_ac97_dai);

 static int __devinit txx9aclc_ac97_dev_probe(struct platform_device *pdev)
 {
 	struct txx9aclc_plat_drvdata *drvdata;
 	struct resource *r;
 	int err;
 	int irq;

 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
 		return irq;
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!r)
 		return -EBUSY;

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

 	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		return -ENOMEM;
 	platform_set_drvdata(pdev, drvdata);
 	drvdata->physbase = r->start;
 	if (sizeof(drvdata->physbase) > sizeof(r->start) &&
 	    r->start >= TXX9_DIRECTMAP_BASE &&
 	    r->start < TXX9_DIRECTMAP_BASE + 0x400000)
 		drvdata->physbase |= 0xf00000000ull;
 	drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
 	if (!drvdata->base)
 		return -EBUSY;
 	err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq,
 			       IRQF_DISABLED, dev_name(&pdev->dev), drvdata);
 	if (err < 0)
 		return err;

 	txx9aclc_ac97_dai.dev = &pdev->dev;
 	return snd_soc_register_dai(&txx9aclc_ac97_dai);
 }

 static int __devexit txx9aclc_ac97_dev_remove(struct platform_device *pdev)
 {
 	snd_soc_unregister_dai(&txx9aclc_ac97_dai);
 	return 0;
 }

 static struct platform_driver txx9aclc_ac97_driver = {
 	.probe		= txx9aclc_ac97_dev_probe,
 	.remove		= __devexit_p(txx9aclc_ac97_dev_remove),
 	.driver		= {
 		.name	= "txx9aclc-ac97",
 		.owner	= THIS_MODULE,
 	},
 };

 static int __init txx9aclc_ac97_init(void)
 {
 	return platform_driver_register(&txx9aclc_ac97_driver);
 }

 static void __exit txx9aclc_ac97_exit(void)
 {
 	platform_driver_unregister(&txx9aclc_ac97_driver);
 }

 module_init(txx9aclc_ac97_init);
 module_exit(txx9aclc_ac97_exit);

 MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
 MODULE_DESCRIPTION("TXx9 ACLC AC97 driver");
 MODULE_LICENSE("GPL");
	/*
	* TXx9 ACLC AC97 driver
	*
	* Copyright (C) 2009 Atsushi Nemoto
	*
	* Based on RBTX49xx patch from CELF patch archive.
	* (C) Copyright TOSHIBA CORPORATION 2004-2006
	*
	* 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.
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/delay.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>
	#include <linux/gfp.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/soc.h>
	#include "txx9aclc.h"

	#define AC97_DIR \
	(SND_SOC_DAIDIR_PLAYBACK \| SND_SOC_DAIDIR_CAPTURE)

	#define AC97_RATES \
	SNDRV_PCM_RATE_8000_48000

	#ifdef __BIG_ENDIAN
	#define AC97_FMTS SNDRV_PCM_FMTBIT_S16_BE
	#else
	#define AC97_FMTS SNDRV_PCM_FMTBIT_S16_LE
	#endif

	static DECLARE_WAIT_QUEUE_HEAD(ac97_waitq);

	/* REVISIT: How to find txx9aclc_soc_device from snd_ac97? */
	static struct txx9aclc_soc_device *txx9aclc_soc_dev;

	static int txx9aclc_regready(struct txx9aclc_soc_device *dev)
	{
	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);

	return __raw_readl(drvdata->base + ACINTSTS) & ACINT_REGACCRDY;
	}

	/* AC97 controller reads codec register */
	static unsigned short txx9aclc_ac97_read(struct snd_ac97 *ac97,
	unsigned short reg)
	{
	struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
	void __iomem *base = drvdata->base;
	u32 dat;

	if (!(__raw_readl(base + ACINTSTS) & ACINT_CODECRDY(ac97->num)))
	return 0xffff;
	reg \|= ac97->num << 7;
	dat = (reg << ACREGACC_REG_SHIFT) \| ACREGACC_READ;
	__raw_writel(dat, base + ACREGACC);
	__raw_writel(ACINT_REGACCRDY, base + ACINTEN);
	if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
	__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
	dev_err(dev->soc_dev.dev, "ac97 read timeout (reg %#x)\n", reg);
	dat = 0xffff;
	goto done;
	}
	dat = __raw_readl(base + ACREGACC);
	if (((dat >> ACREGACC_REG_SHIFT) & 0xff) != reg) {
	dev_err(dev->soc_dev.dev, "reg mismatch %x with %x\n",
	dat, reg);
	dat = 0xffff;
	goto done;
	}
	dat = (dat >> ACREGACC_DAT_SHIFT) & 0xffff;
	done:
	__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
	return dat;
	}

	/* AC97 controller writes to codec register */
	static void txx9aclc_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
	unsigned short val)
	{
	struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
	void __iomem *base = drvdata->base;

	__raw_writel(((reg \| (ac97->num << 7)) << ACREGACC_REG_SHIFT) \|
	(val << ACREGACC_DAT_SHIFT),
	base + ACREGACC);
	__raw_writel(ACINT_REGACCRDY, base + ACINTEN);
	if (!wait_event_timeout(ac97_waitq, txx9aclc_regready(dev), HZ)) {
	dev_err(dev->soc_dev.dev,
	"ac97 write timeout (reg %#x)\n", reg);
	}
	__raw_writel(ACINT_REGACCRDY, base + ACINTDIS);
	}

	static void txx9aclc_ac97_cold_reset(struct snd_ac97 *ac97)
	{
	struct txx9aclc_soc_device *dev = txx9aclc_soc_dev;
	struct txx9aclc_plat_drvdata *drvdata = txx9aclc_get_plat_drvdata(dev);
	void __iomem *base = drvdata->base;
	u32 ready = ACINT_CODECRDY(ac97->num) \| ACINT_REGACCRDY;

	__raw_writel(ACCTL_ENLINK, base + ACCTLDIS);
	mmiowb();
	udelay(1);
	__raw_writel(ACCTL_ENLINK, base + ACCTLEN);
	/* wait for primary codec ready status */
	__raw_writel(ready, base + ACINTEN);
	if (!wait_event_timeout(ac97_waitq,
	(__raw_readl(base + ACINTSTS) & ready) == ready,
	HZ)) {
	dev_err(&ac97->dev, "primary codec is not ready "
	"(status %#x)\n",
	__raw_readl(base + ACINTSTS));
	}
	__raw_writel(ACINT_REGACCRDY, base + ACINTSTS);
	__raw_writel(ready, base + ACINTDIS);
	}

	/* AC97 controller operations */
	struct snd_ac97_bus_ops soc_ac97_ops = {
	.read = txx9aclc_ac97_read,
	.write = txx9aclc_ac97_write,
	.reset = txx9aclc_ac97_cold_reset,
	};
	EXPORT_SYMBOL_GPL(soc_ac97_ops);

	static irqreturn_t txx9aclc_ac97_irq(int irq, void *dev_id)
	{
	struct txx9aclc_plat_drvdata *drvdata = dev_id;
	void __iomem *base = drvdata->base;

	__raw_writel(__raw_readl(base + ACINTMSTS), base + ACINTDIS);
	wake_up(&ac97_waitq);
	return IRQ_HANDLED;
	}

	static int txx9aclc_ac97_probe(struct platform_device *pdev,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct txx9aclc_soc_device *dev =
	container_of(socdev, struct txx9aclc_soc_device, soc_dev);

	dev->aclc_pdev = to_platform_device(dai->dev);
	txx9aclc_soc_dev = dev;
	return 0;
	}

	static void txx9aclc_ac97_remove(struct platform_device *pdev,
	struct snd_soc_dai *dai)
	{
	struct platform_device *aclc_pdev = to_platform_device(dai->dev);
	struct txx9aclc_plat_drvdata *drvdata = platform_get_drvdata(aclc_pdev);

	/* disable AC-link */
	__raw_writel(ACCTL_ENLINK, drvdata->base + ACCTLDIS);
	txx9aclc_soc_dev = NULL;
	}

	struct snd_soc_dai txx9aclc_ac97_dai = {
	.name = "txx9aclc_ac97",
	.ac97_control = 1,
	.probe = txx9aclc_ac97_probe,
	.remove = txx9aclc_ac97_remove,
	.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,
	},
	};
	EXPORT_SYMBOL_GPL(txx9aclc_ac97_dai);

	static int __devinit txx9aclc_ac97_dev_probe(struct platform_device *pdev)
	{
	struct txx9aclc_plat_drvdata *drvdata;
	struct resource *r;
	int err;
	int irq;

	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;
	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r)
	return -EBUSY;

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

	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata)
	return -ENOMEM;
	platform_set_drvdata(pdev, drvdata);
	drvdata->physbase = r->start;
	if (sizeof(drvdata->physbase) > sizeof(r->start) &&
	r->start >= TXX9_DIRECTMAP_BASE &&
	r->start < TXX9_DIRECTMAP_BASE + 0x400000)
	drvdata->physbase \|= 0xf00000000ull;
	drvdata->base = devm_ioremap(&pdev->dev, r->start, resource_size(r));
	if (!drvdata->base)
	return -EBUSY;
	err = devm_request_irq(&pdev->dev, irq, txx9aclc_ac97_irq,
	IRQF_DISABLED, dev_name(&pdev->dev), drvdata);
	if (err < 0)
	return err;

	txx9aclc_ac97_dai.dev = &pdev->dev;
	return snd_soc_register_dai(&txx9aclc_ac97_dai);
	}

	static int __devexit txx9aclc_ac97_dev_remove(struct platform_device *pdev)
	{
	snd_soc_unregister_dai(&txx9aclc_ac97_dai);
	return 0;
	}

	static struct platform_driver txx9aclc_ac97_driver = {
	.probe = txx9aclc_ac97_dev_probe,
	.remove = __devexit_p(txx9aclc_ac97_dev_remove),
	.driver = {
	.name = "txx9aclc-ac97",
	.owner = THIS_MODULE,
	},
	};

	static int __init txx9aclc_ac97_init(void)
	{
	return platform_driver_register(&txx9aclc_ac97_driver);
	}

	static void __exit txx9aclc_ac97_exit(void)
	{
	platform_driver_unregister(&txx9aclc_ac97_driver);
	}

	module_init(txx9aclc_ac97_init);
	module_exit(txx9aclc_ac97_exit);

	MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
	MODULE_DESCRIPTION("TXx9 ACLC AC97 driver");
	MODULE_LICENSE("GPL");