413 строки
10 KiB
C
413 строки
10 KiB
C
/*
|
|
* 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(1 << 31, 1);
|
|
udelay(5);
|
|
pxa_set_cken(1 << 31, 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, struct pt_regs *regs)
|
|
{
|
|
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(CKEN2_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(CKEN2_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 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(CKEN2_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 & CKEN2_AC97) {
|
|
GCR |= GCR_ACLINK_OFF;
|
|
free_irq(IRQ_AC97, NULL);
|
|
pxa_set_cken(CKEN2_AC97, 0);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int 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(CKEN2_AC97, 0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver pxa2xx_ac97_driver = {
|
|
.probe = pxa2xx_ac97_probe,
|
|
.remove = 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");
|