sound/soc/pxa/pxa2xx-ac97.c - kernel/panda - Git at Google

 /*
  * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
  *
  * Author:	Nicolas Pitre
  * Created:	Dec 02, 2004
  * Copyright:	MontaVista Software Inc.
  *
  * 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/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/wait.h>
 #include <linux/clk.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>

 #include <asm/irq.h>
 #include <linux/mutex.h>
 #include <asm/hardware.h>
 #include <asm/arch/pxa-regs.h>
 #include <asm/arch/pxa2xx-gpio.h>
 #include <asm/arch/audio.h>

 #include "pxa2xx-pcm.h"
 #include "pxa2xx-ac97.h"

 static DEFINE_MUTEX(car_mutex);
 static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
 static volatile long gsr_bits;
 static struct clk *ac97_clk;
 #ifdef CONFIG_PXA27x
 static struct clk *ac97conf_clk;
 #endif

 /*
  * Beware PXA27x bugs:
  *
  *   o Slot 12 read from modem space will hang controller.
  *   o CDONE, SDONE interrupt fails after any slot 12 IO.
  *
  * We therefore have an hybrid approach for waiting on SDONE (interrupt or
  * 1 jiffy timeout if interrupt never comes).
  */

 static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97,
 	unsigned short reg)
 {
 	unsigned short val = -1;
 	volatile u32 *reg_addr;

 	mutex_lock(&car_mutex);

 	/* set up primary or secondary codec/modem space */
 #ifdef CONFIG_PXA27x
 	reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 #else
 	if (reg == AC97_GPIO_STATUS)
 		reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
 	else
 		reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 #endif
 	reg_addr += (reg >> 1);

 #ifndef CONFIG_PXA27x
 	if (reg == AC97_GPIO_STATUS) {
 		/* read from controller cache */
 		val = *reg_addr;
 		goto out;
 	}
 #endif

 	/* start read access across the ac97 link */
 	GSR = GSR_CDONE | GSR_SDONE;
 	gsr_bits = 0;
 	val = *reg_addr;

 	wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);
 	if (!((GSR | gsr_bits) & GSR_SDONE)) {
 		printk(KERN_ERR "%s: read error (ac97_reg=%x GSR=%#lx)\n",
 				__FUNCTION__, reg, GSR | gsr_bits);
 		val = -1;
 		goto out;
 	}

 	/* valid data now */
 	GSR = GSR_CDONE | GSR_SDONE;
 	gsr_bits = 0;
 	val = *reg_addr;
 	/* but we've just started another cycle... */
 	wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1);

 out:	mutex_unlock(&car_mutex);
 	return val;
 }

 static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 	unsigned short val)
 {
 	volatile u32 *reg_addr;

 	mutex_lock(&car_mutex);

 	/* set up primary or secondary codec/modem space */
 #ifdef CONFIG_PXA27x
 	reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 #else
 	if (reg == AC97_GPIO_STATUS)
 		reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
 	else
 		reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
 #endif
 	reg_addr += (reg >> 1);

 	GSR = GSR_CDONE | GSR_SDONE;
 	gsr_bits = 0;
 	*reg_addr = val;
 	wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1);
 	if (!((GSR | gsr_bits) & GSR_CDONE))
 		printk(KERN_ERR "%s: write error (ac97_reg=%x GSR=%#lx)\n",
 				__FUNCTION__, reg, GSR | gsr_bits);

 	mutex_unlock(&car_mutex);
 }

 static void pxa2xx_ac97_warm_reset(struct snd_ac97 *ac97)
 {
 	gsr_bits = 0;

 #ifdef CONFIG_PXA27x
 	/* warm reset broken on Bulverde,
 	   so manually keep AC97 reset high */
 	pxa_gpio_mode(113 | GPIO_OUT | GPIO_DFLT_HIGH);
 	udelay(10);
 	GCR |= GCR_WARM_RST;
 	pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 	udelay(500);
 #else
 	GCR |= GCR_WARM_RST | GCR_PRIRDY_IEN | GCR_SECRDY_IEN;
 	wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 #endif

 	if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
 		printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
 				 __FUNCTION__, gsr_bits);

 	GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 	GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
 }

 static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97)
 {
 	GCR &=  GCR_COLD_RST;  /* clear everything but nCRST */
 	GCR &= ~GCR_COLD_RST;  /* then assert nCRST */

 	gsr_bits = 0;
 #ifdef CONFIG_PXA27x
 	/* PXA27x Developers Manual section 13.5.2.2.1 */
 	clk_enable(ac97conf_clk);
 	udelay(5);
 	clk_disable(ac97conf_clk);
 	GCR = GCR_COLD_RST;
 	udelay(50);
 #else
 	GCR = GCR_COLD_RST;
 	GCR |= GCR_CDONE_IE|GCR_SDONE_IE;
 	wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR | GSR_SCR), 1);
 #endif

 	if (!((GSR | gsr_bits) & (GSR_PCR | GSR_SCR)))
 		printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
 				 __FUNCTION__, gsr_bits);

 	GCR &= ~(GCR_PRIRDY_IEN|GCR_SECRDY_IEN);
 	GCR |= GCR_SDONE_IE|GCR_CDONE_IE;
 }

 static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
 {
 	long status;

 	status = GSR;
 	if (status) {
 		GSR = status;
 		gsr_bits |= status;
 		wake_up(&gsr_wq);

 #ifdef CONFIG_PXA27x
 		/* Although we don't use those we still need to clear them
 		   since they tend to spuriously trigger when MMC is used
 		   (hardware bug? go figure)... */
 		MISR = MISR_EOC;
 		PISR = PISR_EOC;
 		MCSR = MCSR_EOC;
 #endif

 		return IRQ_HANDLED;
 	}

 	return IRQ_NONE;
 }

 struct snd_ac97_bus_ops soc_ac97_ops = {
 	.read	= pxa2xx_ac97_read,
 	.write	= pxa2xx_ac97_write,
 	.warm_reset	= pxa2xx_ac97_warm_reset,
 	.reset	= pxa2xx_ac97_cold_reset,
 };

 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_out = {
 	.name			= "AC97 PCM Stereo out",
 	.dev_addr		= __PREG(PCDR),
 	.drcmr			= &DRCMRTXPCDR,
 	.dcmd			= DCMD_INCSRCADDR | DCMD_FLOWTRG |
 				  DCMD_BURST32 | DCMD_WIDTH4,
 };

 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_in = {
 	.name			= "AC97 PCM Stereo in",
 	.dev_addr		= __PREG(PCDR),
 	.drcmr			= &DRCMRRXPCDR,
 	.dcmd			= DCMD_INCTRGADDR | DCMD_FLOWSRC |
 				  DCMD_BURST32 | DCMD_WIDTH4,
 };

 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_out = {
 	.name			= "AC97 Aux PCM (Slot 5) Mono out",
 	.dev_addr		= __PREG(MODR),
 	.drcmr			= &DRCMRTXMODR,
 	.dcmd			= DCMD_INCSRCADDR | DCMD_FLOWTRG |
 				  DCMD_BURST16 | DCMD_WIDTH2,
 };

 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_in = {
 	.name			= "AC97 Aux PCM (Slot 5) Mono in",
 	.dev_addr		= __PREG(MODR),
 	.drcmr			= &DRCMRRXMODR,
 	.dcmd			= DCMD_INCTRGADDR | DCMD_FLOWSRC |
 				  DCMD_BURST16 | DCMD_WIDTH2,
 };

 static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_mic_mono_in = {
 	.name			= "AC97 Mic PCM (Slot 6) Mono in",
 	.dev_addr		= __PREG(MCDR),
 	.drcmr			= &DRCMRRXMCDR,
 	.dcmd			= DCMD_INCTRGADDR | DCMD_FLOWSRC |
 				  DCMD_BURST16 | DCMD_WIDTH2,
 };

 #ifdef CONFIG_PM
 static int pxa2xx_ac97_suspend(struct platform_device *pdev,
 	struct snd_soc_cpu_dai *dai)
 {
 	GCR |= GCR_ACLINK_OFF;
 	clk_disable(ac97_clk);
 	return 0;
 }

 static int pxa2xx_ac97_resume(struct platform_device *pdev,
 	struct snd_soc_cpu_dai *dai)
 {
 	pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
 	pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
 	pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
 	pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
 #ifdef CONFIG_PXA27x
 	/* Use GPIO 113 as AC97 Reset on Bulverde */
 	pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);
 #endif
 	clk_enable(ac97_clk);
 	return 0;
 }

 #else
 #define pxa2xx_ac97_suspend	NULL
 #define pxa2xx_ac97_resume	NULL
 #endif

 static int pxa2xx_ac97_probe(struct platform_device *pdev)
 {
 	int ret;

 	ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
 	if (ret < 0)
 		goto err;

 	pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
 	pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
 	pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
 	pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
 #ifdef CONFIG_PXA27x
 	/* Use GPIO 113 as AC97 Reset on Bulverde */
 	pxa_gpio_mode(113 | GPIO_ALT_FN_2_OUT);

 	ac97conf_clk = clk_get(&pdev->dev, "AC97CONFCLK");
 	if (IS_ERR(ac97conf_clk)) {
 		ret = PTR_ERR(ac97conf_clk);
 		ac97conf_clk = NULL;
 		goto err_irq;
 	}
 #endif
 	ac97_clk = clk_get(&pdev->dev, "AC97CLK");
 	if (IS_ERR(ac97_clk)) {
 		ret = PTR_ERR(ac97_clk);
 		ac97_clk = NULL;
 		goto err_irq;
 	}
 	return 0;

  err_irq:
 	GCR |= GCR_ACLINK_OFF;
 #ifdef CONFIG_PXA27x
 	if (ac97conf_clk) {
 		clk_put(ac97conf_clk);
 		ac97conf_clk = NULL;
 	}
 #endif
 	free_irq(IRQ_AC97, NULL);
  err:
 	return ret;
 }

 static void pxa2xx_ac97_remove(struct platform_device *pdev)
 {
 	GCR |= GCR_ACLINK_OFF;
 	free_irq(IRQ_AC97, NULL);
 #ifdef CONFIG_PXA27x
 	clk_put(ac97conf_clk);
 	ac97conf_clk = NULL;
 #endif
 	clk_disable(ac97_clk);
 	clk_put(ac97_clk);
 	ac97_clk = NULL;
 }

 static int pxa2xx_ac97_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_out;
 	else
 		cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_in;

 	return 0;
 }

 static int pxa2xx_ac97_hw_aux_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_out;
 	else
 		cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_in;

 	return 0;
 }

 static int pxa2xx_ac97_hw_mic_params(struct snd_pcm_substream *substream,
 	struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		return -ENODEV;
 	else
 		cpu_dai->dma_data = &pxa2xx_ac97_pcm_mic_mono_in;

 	return 0;
 }

 #define PXA2XX_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
 		SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
 		SNDRV_PCM_RATE_48000)

 /*
  * There is only 1 physical AC97 interface for pxa2xx, but it
  * has extra fifo's that can be used for aux DACs and ADCs.
  */
 struct snd_soc_cpu_dai pxa_ac97_dai[] = {
 {
 	.name = "pxa2xx-ac97",
 	.id = 0,
 	.type = SND_SOC_DAI_AC97,
 	.probe = pxa2xx_ac97_probe,
 	.remove = pxa2xx_ac97_remove,
 	.suspend = pxa2xx_ac97_suspend,
 	.resume = pxa2xx_ac97_resume,
 	.playback = {
 		.stream_name = "AC97 Playback",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = PXA2XX_AC97_RATES,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 	.capture = {
 		.stream_name = "AC97 Capture",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = PXA2XX_AC97_RATES,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 	.ops = {
 		.hw_params = pxa2xx_ac97_hw_params,},
 },
 {
 	.name = "pxa2xx-ac97-aux",
 	.id = 1,
 	.type = SND_SOC_DAI_AC97,
 	.playback = {
 		.stream_name = "AC97 Aux Playback",
 		.channels_min = 1,
 		.channels_max = 1,
 		.rates = PXA2XX_AC97_RATES,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 	.capture = {
 		.stream_name = "AC97 Aux Capture",
 		.channels_min = 1,
 		.channels_max = 1,
 		.rates = PXA2XX_AC97_RATES,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 	.ops = {
 		.hw_params = pxa2xx_ac97_hw_aux_params,},
 },
 {
 	.name = "pxa2xx-ac97-mic",
 	.id = 2,
 	.type = SND_SOC_DAI_AC97,
 	.capture = {
 		.stream_name = "AC97 Mic Capture",
 		.channels_min = 1,
 		.channels_max = 1,
 		.rates = PXA2XX_AC97_RATES,
 		.formats = SNDRV_PCM_FMTBIT_S16_LE,},
 	.ops = {
 		.hw_params = pxa2xx_ac97_hw_mic_params,},
 },
 };

 EXPORT_SYMBOL_GPL(pxa_ac97_dai);
 EXPORT_SYMBOL_GPL(soc_ac97_ops);

 MODULE_AUTHOR("Nicolas Pitre");
 MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 MODULE_LICENSE("GPL");
	/*
	* linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
	*
	* Author: Nicolas Pitre
	* Created: Dec 02, 2004
	* Copyright: MontaVista Software Inc.
	*
	* 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/platform_device.h>
	#include <linux/interrupt.h>
	#include <linux/wait.h>
	#include <linux/clk.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>

	#include <asm/irq.h>
	#include <linux/mutex.h>
	#include <asm/hardware.h>
	#include <asm/arch/pxa-regs.h>
	#include <asm/arch/pxa2xx-gpio.h>
	#include <asm/arch/audio.h>

	#include "pxa2xx-pcm.h"
	#include "pxa2xx-ac97.h"

	static DEFINE_MUTEX(car_mutex);
	static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
	static volatile long gsr_bits;
	static struct clk *ac97_clk;
	#ifdef CONFIG_PXA27x
	static struct clk *ac97conf_clk;
	#endif

	/*
	* Beware PXA27x bugs:
	*
	* o Slot 12 read from modem space will hang controller.
	* o CDONE, SDONE interrupt fails after any slot 12 IO.
	*
	* We therefore have an hybrid approach for waiting on SDONE (interrupt or
	* 1 jiffy timeout if interrupt never comes).
	*/

	static unsigned short pxa2xx_ac97_read(struct snd_ac97 *ac97,
	unsigned short reg)
	{
	unsigned short val = -1;
	volatile u32 *reg_addr;

	mutex_lock(&car_mutex);

	/* set up primary or secondary codec/modem space */
	#ifdef CONFIG_PXA27x
	reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
	#else
	if (reg == AC97_GPIO_STATUS)
	reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
	else
	reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
	#endif
	reg_addr += (reg >> 1);

	#ifndef CONFIG_PXA27x
	if (reg == AC97_GPIO_STATUS) {
	/* read from controller cache */
	val = *reg_addr;
	goto out;
	}
	#endif

	/* start read access across the ac97 link */
	GSR = GSR_CDONE \| GSR_SDONE;
	gsr_bits = 0;
	val = *reg_addr;

	wait_event_timeout(gsr_wq, (GSR \| gsr_bits) & GSR_SDONE, 1);
	if (!((GSR \| gsr_bits) & GSR_SDONE)) {
	printk(KERN_ERR "%s: read error (ac97_reg=%x GSR=%#lx)\n",
	__FUNCTION__, reg, GSR \| gsr_bits);
	val = -1;
	goto out;
	}

	/* valid data now */
	GSR = GSR_CDONE \| GSR_SDONE;
	gsr_bits = 0;
	val = *reg_addr;
	/* but we've just started another cycle... */
	wait_event_timeout(gsr_wq, (GSR \| gsr_bits) & GSR_SDONE, 1);

	out: mutex_unlock(&car_mutex);
	return val;
	}

	static void pxa2xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
	unsigned short val)
	{
	volatile u32 *reg_addr;

	mutex_lock(&car_mutex);

	/* set up primary or secondary codec/modem space */
	#ifdef CONFIG_PXA27x
	reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
	#else
	if (reg == AC97_GPIO_STATUS)
	reg_addr = ac97->num ? &SMC_REG_BASE : &PMC_REG_BASE;
	else
	reg_addr = ac97->num ? &SAC_REG_BASE : &PAC_REG_BASE;
	#endif
	reg_addr += (reg >> 1);

	GSR = GSR_CDONE \| GSR_SDONE;
	gsr_bits = 0;
	*reg_addr = val;
	wait_event_timeout(gsr_wq, (GSR \| gsr_bits) & GSR_CDONE, 1);
	if (!((GSR \| gsr_bits) & GSR_CDONE))
	printk(KERN_ERR "%s: write error (ac97_reg=%x GSR=%#lx)\n",
	__FUNCTION__, reg, GSR \| gsr_bits);

	mutex_unlock(&car_mutex);
	}

	static void pxa2xx_ac97_warm_reset(struct snd_ac97 *ac97)
	{
	gsr_bits = 0;

	#ifdef CONFIG_PXA27x
	/* warm reset broken on Bulverde,
	so manually keep AC97 reset high */
	pxa_gpio_mode(113 \| GPIO_OUT \| GPIO_DFLT_HIGH);
	udelay(10);
	GCR \|= GCR_WARM_RST;
	pxa_gpio_mode(113 \| GPIO_ALT_FN_2_OUT);
	udelay(500);
	#else
	GCR \|= GCR_WARM_RST \| GCR_PRIRDY_IEN \| GCR_SECRDY_IEN;
	wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR \| GSR_SCR), 1);
	#endif

	if (!((GSR \| gsr_bits) & (GSR_PCR \| GSR_SCR)))
	printk(KERN_INFO "%s: warm reset timeout (GSR=%#lx)\n",
	__FUNCTION__, gsr_bits);

	GCR &= ~(GCR_PRIRDY_IEN\|GCR_SECRDY_IEN);
	GCR \|= GCR_SDONE_IE\|GCR_CDONE_IE;
	}

	static void pxa2xx_ac97_cold_reset(struct snd_ac97 *ac97)
	{
	GCR &= GCR_COLD_RST; /* clear everything but nCRST */
	GCR &= ~GCR_COLD_RST; /* then assert nCRST */

	gsr_bits = 0;
	#ifdef CONFIG_PXA27x
	/* PXA27x Developers Manual section 13.5.2.2.1 */
	clk_enable(ac97conf_clk);
	udelay(5);
	clk_disable(ac97conf_clk);
	GCR = GCR_COLD_RST;
	udelay(50);
	#else
	GCR = GCR_COLD_RST;
	GCR \|= GCR_CDONE_IE\|GCR_SDONE_IE;
	wait_event_timeout(gsr_wq, gsr_bits & (GSR_PCR \| GSR_SCR), 1);
	#endif

	if (!((GSR \| gsr_bits) & (GSR_PCR \| GSR_SCR)))
	printk(KERN_INFO "%s: cold reset timeout (GSR=%#lx)\n",
	__FUNCTION__, gsr_bits);

	GCR &= ~(GCR_PRIRDY_IEN\|GCR_SECRDY_IEN);
	GCR \|= GCR_SDONE_IE\|GCR_CDONE_IE;
	}

	static irqreturn_t pxa2xx_ac97_irq(int irq, void *dev_id)
	{
	long status;

	status = GSR;
	if (status) {
	GSR = status;
	gsr_bits \|= status;
	wake_up(&gsr_wq);

	#ifdef CONFIG_PXA27x
	/* Although we don't use those we still need to clear them
	since they tend to spuriously trigger when MMC is used
	(hardware bug? go figure)... */
	MISR = MISR_EOC;
	PISR = PISR_EOC;
	MCSR = MCSR_EOC;
	#endif

	return IRQ_HANDLED;
	}

	return IRQ_NONE;
	}

	struct snd_ac97_bus_ops soc_ac97_ops = {
	.read = pxa2xx_ac97_read,
	.write = pxa2xx_ac97_write,
	.warm_reset = pxa2xx_ac97_warm_reset,
	.reset = pxa2xx_ac97_cold_reset,
	};

	static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_out = {
	.name = "AC97 PCM Stereo out",
	.dev_addr = __PREG(PCDR),
	.drcmr = &DRCMRTXPCDR,
	.dcmd = DCMD_INCSRCADDR \| DCMD_FLOWTRG \|
	DCMD_BURST32 \| DCMD_WIDTH4,
	};

	static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_stereo_in = {
	.name = "AC97 PCM Stereo in",
	.dev_addr = __PREG(PCDR),
	.drcmr = &DRCMRRXPCDR,
	.dcmd = DCMD_INCTRGADDR \| DCMD_FLOWSRC \|
	DCMD_BURST32 \| DCMD_WIDTH4,
	};

	static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_out = {
	.name = "AC97 Aux PCM (Slot 5) Mono out",
	.dev_addr = __PREG(MODR),
	.drcmr = &DRCMRTXMODR,
	.dcmd = DCMD_INCSRCADDR \| DCMD_FLOWTRG \|
	DCMD_BURST16 \| DCMD_WIDTH2,
	};

	static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_aux_mono_in = {
	.name = "AC97 Aux PCM (Slot 5) Mono in",
	.dev_addr = __PREG(MODR),
	.drcmr = &DRCMRRXMODR,
	.dcmd = DCMD_INCTRGADDR \| DCMD_FLOWSRC \|
	DCMD_BURST16 \| DCMD_WIDTH2,
	};

	static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_mic_mono_in = {
	.name = "AC97 Mic PCM (Slot 6) Mono in",
	.dev_addr = __PREG(MCDR),
	.drcmr = &DRCMRRXMCDR,
	.dcmd = DCMD_INCTRGADDR \| DCMD_FLOWSRC \|
	DCMD_BURST16 \| DCMD_WIDTH2,
	};

	#ifdef CONFIG_PM
	static int pxa2xx_ac97_suspend(struct platform_device *pdev,
	struct snd_soc_cpu_dai *dai)
	{
	GCR \|= GCR_ACLINK_OFF;
	clk_disable(ac97_clk);
	return 0;
	}

	static int pxa2xx_ac97_resume(struct platform_device *pdev,
	struct snd_soc_cpu_dai *dai)
	{
	pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
	pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
	pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
	pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
	#ifdef CONFIG_PXA27x
	/* Use GPIO 113 as AC97 Reset on Bulverde */
	pxa_gpio_mode(113 \| GPIO_ALT_FN_2_OUT);
	#endif
	clk_enable(ac97_clk);
	return 0;
	}

	#else
	#define pxa2xx_ac97_suspend NULL
	#define pxa2xx_ac97_resume NULL
	#endif

	static int pxa2xx_ac97_probe(struct platform_device *pdev)
	{
	int ret;

	ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, IRQF_DISABLED, "AC97", NULL);
	if (ret < 0)
	goto err;

	pxa_gpio_mode(GPIO31_SYNC_AC97_MD);
	pxa_gpio_mode(GPIO30_SDATA_OUT_AC97_MD);
	pxa_gpio_mode(GPIO28_BITCLK_AC97_MD);
	pxa_gpio_mode(GPIO29_SDATA_IN_AC97_MD);
	#ifdef CONFIG_PXA27x
	/* Use GPIO 113 as AC97 Reset on Bulverde */
	pxa_gpio_mode(113 \| GPIO_ALT_FN_2_OUT);

	ac97conf_clk = clk_get(&pdev->dev, "AC97CONFCLK");
	if (IS_ERR(ac97conf_clk)) {
	ret = PTR_ERR(ac97conf_clk);
	ac97conf_clk = NULL;
	goto err_irq;
	}
	#endif
	ac97_clk = clk_get(&pdev->dev, "AC97CLK");
	if (IS_ERR(ac97_clk)) {
	ret = PTR_ERR(ac97_clk);
	ac97_clk = NULL;
	goto err_irq;
	}
	return 0;

	err_irq:
	GCR \|= GCR_ACLINK_OFF;
	#ifdef CONFIG_PXA27x
	if (ac97conf_clk) {
	clk_put(ac97conf_clk);
	ac97conf_clk = NULL;
	}
	#endif
	free_irq(IRQ_AC97, NULL);
	err:
	return ret;
	}

	static void pxa2xx_ac97_remove(struct platform_device *pdev)
	{
	GCR \|= GCR_ACLINK_OFF;
	free_irq(IRQ_AC97, NULL);
	#ifdef CONFIG_PXA27x
	clk_put(ac97conf_clk);
	ac97conf_clk = NULL;
	#endif
	clk_disable(ac97_clk);
	clk_put(ac97_clk);
	ac97_clk = NULL;
	}

	static int pxa2xx_ac97_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_out;
	else
	cpu_dai->dma_data = &pxa2xx_ac97_pcm_stereo_in;

	return 0;
	}

	static int pxa2xx_ac97_hw_aux_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_out;
	else
	cpu_dai->dma_data = &pxa2xx_ac97_pcm_aux_mono_in;

	return 0;
	}

	static int pxa2xx_ac97_hw_mic_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	return -ENODEV;
	else
	cpu_dai->dma_data = &pxa2xx_ac97_pcm_mic_mono_in;

	return 0;
	}

	#define PXA2XX_AC97_RATES (SNDRV_PCM_RATE_8000 \| SNDRV_PCM_RATE_11025 \|\
	SNDRV_PCM_RATE_16000 \| SNDRV_PCM_RATE_22050 \| SNDRV_PCM_RATE_44100 \| \
	SNDRV_PCM_RATE_48000)

	/*
	* There is only 1 physical AC97 interface for pxa2xx, but it
	* has extra fifo's that can be used for aux DACs and ADCs.
	*/
	struct snd_soc_cpu_dai pxa_ac97_dai[] = {
	{
	.name = "pxa2xx-ac97",
	.id = 0,
	.type = SND_SOC_DAI_AC97,
	.probe = pxa2xx_ac97_probe,
	.remove = pxa2xx_ac97_remove,
	.suspend = pxa2xx_ac97_suspend,
	.resume = pxa2xx_ac97_resume,
	.playback = {
	.stream_name = "AC97 Playback",
	.channels_min = 2,
	.channels_max = 2,
	.rates = PXA2XX_AC97_RATES,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.capture = {
	.stream_name = "AC97 Capture",
	.channels_min = 2,
	.channels_max = 2,
	.rates = PXA2XX_AC97_RATES,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = {
	.hw_params = pxa2xx_ac97_hw_params,},
	},
	{
	.name = "pxa2xx-ac97-aux",
	.id = 1,
	.type = SND_SOC_DAI_AC97,
	.playback = {
	.stream_name = "AC97 Aux Playback",
	.channels_min = 1,
	.channels_max = 1,
	.rates = PXA2XX_AC97_RATES,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.capture = {
	.stream_name = "AC97 Aux Capture",
	.channels_min = 1,
	.channels_max = 1,
	.rates = PXA2XX_AC97_RATES,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = {
	.hw_params = pxa2xx_ac97_hw_aux_params,},
	},
	{
	.name = "pxa2xx-ac97-mic",
	.id = 2,
	.type = SND_SOC_DAI_AC97,
	.capture = {
	.stream_name = "AC97 Mic Capture",
	.channels_min = 1,
	.channels_max = 1,
	.rates = PXA2XX_AC97_RATES,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,},
	.ops = {
	.hw_params = pxa2xx_ac97_hw_mic_params,},
	},
	};

	EXPORT_SYMBOL_GPL(pxa_ac97_dai);
	EXPORT_SYMBOL_GPL(soc_ac97_ops);

	MODULE_AUTHOR("Nicolas Pitre");
	MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
	MODULE_LICENSE("GPL");