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linux/sound/arm/pxa2xx-ac97.c
Michael Brunner 03d14a5536 [ARM] 4690/1: PXA: fix CKEN corruption in PXA27x AC97 cold reset code 
Fix CKEN register corruption in the PXA27x cold reset code
located in sound/arm/pxa27x-ac97.c. The problem has been
introduced with a pxa_set_cken() function change in linux 2.6.23.
This patch is based on patch 4527/1 that fixes the same problem in
the ASoC PXA-AC97 driver. Additionally a definition for the CKEN
index value is added and applied to both PXA AC97 drivers.

Signed-off-by: Michael Brunner <mibru@gmx.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2007-12-08 14:36:06 +00:00

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/*
* 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/kernel.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <asm/irq.h>
#include <linux/mutex.h>
#include <asm/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/audio.h>
#include "pxa2xx-pcm.h"
static DEFINE_MUTEX(car_mutex);
static DECLARE_WAIT_QUEUE_HEAD(gsr_wq);
static volatile long gsr_bits;
/*
* 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 space */
reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
reg_addr += (reg >> 1);
/* start read access across the ac97 link */
GSR = GSR_CDONE | GSR_SDONE;
gsr_bits = 0;
val = *reg_addr;
if (reg == AC97_GPIO_STATUS)
goto out;
if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_SDONE, 1) <= 0 &&
!((GSR | gsr_bits) & GSR_SDONE)) {
printk(KERN_ERR "%s: read error (ac97_reg=%d 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 space */
reg_addr = (ac97->num & 1) ? &SAC_REG_BASE : &PAC_REG_BASE;
reg_addr += (reg >> 1);
GSR = GSR_CDONE | GSR_SDONE;
gsr_bits = 0;
*reg_addr = val;
if (wait_event_timeout(gsr_wq, (GSR | gsr_bits) & GSR_CDONE, 1) <= 0 &&
!((GSR | gsr_bits) & GSR_CDONE))
printk(KERN_ERR "%s: write error (ac97_reg=%d GSR=%#lx)\n",
__FUNCTION__, reg, GSR | gsr_bits);
mutex_unlock(&car_mutex);
}
static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
{
/* First, try cold reset */
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 */
pxa_set_cken(CKEN_AC97CONF, 1);
udelay(5);
pxa_set_cken(CKEN_AC97CONF, 0);
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);
/* let's try warm reset */
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 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;
}
static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
.read = pxa2xx_ac97_read,
.write = pxa2xx_ac97_write,
.reset = pxa2xx_ac97_reset,
};
static struct pxa2xx_pcm_dma_params pxa2xx_ac97_pcm_out = {
.name = "AC97 PCM 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_in = {
.name = "AC97 PCM in",
.dev_addr = __PREG(PCDR),
.drcmr = &DRCMRRXPCDR,
.dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC |
DCMD_BURST32 | DCMD_WIDTH4,
};
static struct snd_pcm *pxa2xx_ac97_pcm;
static struct snd_ac97 *pxa2xx_ac97_ac97;
static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
pxa2xx_audio_ops_t *platform_ops;
int r;
runtime->hw.channels_min = 2;
runtime->hw.channels_max = 2;
r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
snd_pcm_limit_hw_rates(runtime);
platform_ops = substream->pcm->card->dev->platform_data;
if (platform_ops && platform_ops->startup)
return platform_ops->startup(substream, platform_ops->priv);
else
return 0;
}
static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
{
pxa2xx_audio_ops_t *platform_ops;
platform_ops = substream->pcm->card->dev->platform_data;
if (platform_ops && platform_ops->shutdown)
platform_ops->shutdown(substream, platform_ops->priv);
}
static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
}
static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
.playback_params = &pxa2xx_ac97_pcm_out,
.capture_params = &pxa2xx_ac97_pcm_in,
.startup = pxa2xx_ac97_pcm_startup,
.shutdown = pxa2xx_ac97_pcm_shutdown,
.prepare = pxa2xx_ac97_pcm_prepare,
};
#ifdef CONFIG_PM
static int pxa2xx_ac97_do_suspend(struct snd_card *card, pm_message_t state)
{
pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
snd_pcm_suspend_all(pxa2xx_ac97_pcm);
snd_ac97_suspend(pxa2xx_ac97_ac97);
if (platform_ops && platform_ops->suspend)
platform_ops->suspend(platform_ops->priv);
GCR |= GCR_ACLINK_OFF;
pxa_set_cken(CKEN_AC97, 0);
return 0;
}
static int pxa2xx_ac97_do_resume(struct snd_card *card)
{
pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
pxa_set_cken(CKEN_AC97, 1);
if (platform_ops && platform_ops->resume)
platform_ops->resume(platform_ops->priv);
snd_ac97_resume(pxa2xx_ac97_ac97);
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
}
static int pxa2xx_ac97_suspend(struct platform_device *dev, pm_message_t state)
{
struct snd_card *card = platform_get_drvdata(dev);
int ret = 0;
if (card)
ret = pxa2xx_ac97_do_suspend(card, PMSG_SUSPEND);
return ret;
}
static int pxa2xx_ac97_resume(struct platform_device *dev)
{
struct snd_card *card = platform_get_drvdata(dev);
int ret = 0;
if (card)
ret = pxa2xx_ac97_do_resume(card);
return ret;
}
#else
#define pxa2xx_ac97_suspend NULL
#define pxa2xx_ac97_resume NULL
#endif
static int __devinit pxa2xx_ac97_probe(struct platform_device *dev)
{
struct snd_card *card;
struct snd_ac97_bus *ac97_bus;
struct snd_ac97_template ac97_template;
int ret;
ret = -ENOMEM;
card = snd_card_new(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
THIS_MODULE, 0);
if (!card)
goto err;
card->dev = &dev->dev;
strncpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
if (ret)
goto err;
ret = request_irq(IRQ_AC97, pxa2xx_ac97_irq, 0, "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);
#endif
pxa_set_cken(CKEN_AC97, 1);
ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
if (ret)
goto err;
memset(&ac97_template, 0, sizeof(ac97_template));
ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
if (ret)
goto err;
snprintf(card->shortname, sizeof(card->shortname),
"%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
snprintf(card->longname, sizeof(card->longname),
"%s (%s)", dev->dev.driver->name, card->mixername);
ret = snd_card_register(card);
if (ret == 0) {
platform_set_drvdata(dev, card);
return 0;
}
err:
if (card)
snd_card_free(card);
if (CKEN & (1 << CKEN_AC97)) {
GCR |= GCR_ACLINK_OFF;
free_irq(IRQ_AC97, NULL);
pxa_set_cken(CKEN_AC97, 0);
}
return ret;
}
static int __devexit pxa2xx_ac97_remove(struct platform_device *dev)
{
struct snd_card *card = platform_get_drvdata(dev);
if (card) {
snd_card_free(card);
platform_set_drvdata(dev, NULL);
GCR |= GCR_ACLINK_OFF;
free_irq(IRQ_AC97, NULL);
pxa_set_cken(CKEN_AC97, 0);
}
return 0;
}
static struct platform_driver pxa2xx_ac97_driver = {
.probe = pxa2xx_ac97_probe,
.remove = __devexit_p(pxa2xx_ac97_remove),
.suspend = pxa2xx_ac97_suspend,
.resume = pxa2xx_ac97_resume,
.driver = {
.name = "pxa2xx-ac97",
},
};
static int __init pxa2xx_ac97_init(void)
{
return platform_driver_register(&pxa2xx_ac97_driver);
}
static void __exit pxa2xx_ac97_exit(void)
{
platform_driver_unregister(&pxa2xx_ac97_driver);
}
module_init(pxa2xx_ac97_init);
module_exit(pxa2xx_ac97_exit);
MODULE_AUTHOR("Nicolas Pitre");
MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
MODULE_LICENSE("GPL");
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