Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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");