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sample-ac97.c

/*
 * Sample Au12x0/Au1550 PSC AC97 sound machine.
 *
 * Copyright (c) 2007-2008 Manuel Lauss <mano@roarinelk.homelinux.net>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms outlined in the file COPYING at the root of this
 *  source archive.
 *
 * This is a very generic AC97 sound machine driver for boards which
 * have (AC97) audio at PSC1 (e.g. DB1200 demoboards).
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/au1xxx_psc.h>
#include <asm/mach-au1x00/au1xxx_dbdma.h>

#include "../codecs/ac97.h"
#include "psc.h"

static int au1xpsc_sample_ac97_init(struct snd_soc_codec *codec)
{
      snd_soc_dapm_sync(codec);
      return 0;
}

static struct snd_soc_dai_link au1xpsc_sample_ac97_dai = {
      .name       = "AC97",
      .stream_name      = "AC97 HiFi",
      .cpu_dai    = &au1xpsc_ac97_dai,    /* see psc-ac97.c */
      .codec_dai  = &ac97_dai,            /* see codecs/ac97.c */
      .init       = au1xpsc_sample_ac97_init,
      .ops        = NULL,
};

static struct snd_soc_card au1xpsc_sample_ac97_machine = {
      .name       = "Au1xxx PSC AC97 Audio",
      .dai_link   = &au1xpsc_sample_ac97_dai,
      .num_links  = 1,
};

static struct snd_soc_device au1xpsc_sample_ac97_devdata = {
      .card       = &au1xpsc_sample_ac97_machine,
      .platform   = &au1xpsc_soc_platform, /* see dbdma2.c */
      .codec_dev  = &soc_codec_dev_ac97,
};

static struct resource au1xpsc_psc1_res[] = {
      [0] = {
            .start      = CPHYSADDR(PSC1_BASE_ADDR),
            .end  = CPHYSADDR(PSC1_BASE_ADDR) + 0x000fffff,
            .flags      = IORESOURCE_MEM,
      },
      [1] = {
#ifdef CONFIG_SOC_AU1200
            .start      = AU1200_PSC1_INT,
            .end  = AU1200_PSC1_INT,
#elif defined(CONFIG_SOC_AU1550)
            .start      = AU1550_PSC1_INT,
            .end  = AU1550_PSC1_INT,
#endif
            .flags      = IORESOURCE_IRQ,
      },
      [2] = {
            .start      = DSCR_CMD0_PSC1_TX,
            .end  = DSCR_CMD0_PSC1_TX,
            .flags      = IORESOURCE_DMA,
      },
      [3] = {
            .start      = DSCR_CMD0_PSC1_RX,
            .end  = DSCR_CMD0_PSC1_RX,
            .flags      = IORESOURCE_DMA,
      },
};

static struct platform_device *au1xpsc_sample_ac97_dev;

static int __init au1xpsc_sample_ac97_load(void)
{
      int ret;

#ifdef CONFIG_SOC_AU1200
      unsigned long io;

      /* modify sys_pinfunc for AC97 on PSC1 */
      io = au_readl(SYS_PINFUNC);
      io |= SYS_PINFUNC_P1C;
      io &= ~(SYS_PINFUNC_P1A | SYS_PINFUNC_P1B);
      au_writel(io, SYS_PINFUNC);
      au_sync();
#endif

      ret = -ENOMEM;

      /* setup PSC clock source for AC97 part: external clock provided
       * by codec.  The psc-ac97.c driver depends on this setting!
       */
      au_writel(PSC_SEL_CLK_SERCLK, PSC1_BASE_ADDR + PSC_SEL_OFFSET);
      au_sync();

      au1xpsc_sample_ac97_dev = platform_device_alloc("soc-audio", -1);
      if (!au1xpsc_sample_ac97_dev)
            goto out;

      au1xpsc_sample_ac97_dev->resource =
            kmemdup(au1xpsc_psc1_res, sizeof(struct resource) *
                  ARRAY_SIZE(au1xpsc_psc1_res), GFP_KERNEL);
      au1xpsc_sample_ac97_dev->num_resources = ARRAY_SIZE(au1xpsc_psc1_res);
      au1xpsc_sample_ac97_dev->id = 1;

      platform_set_drvdata(au1xpsc_sample_ac97_dev,
                       &au1xpsc_sample_ac97_devdata);
      au1xpsc_sample_ac97_devdata.dev = &au1xpsc_sample_ac97_dev->dev;
      ret = platform_device_add(au1xpsc_sample_ac97_dev);

      if (ret) {
            platform_device_put(au1xpsc_sample_ac97_dev);
            au1xpsc_sample_ac97_dev = NULL;
      }

out:
      return ret;
}

static void __exit au1xpsc_sample_ac97_exit(void)
{
      platform_device_unregister(au1xpsc_sample_ac97_dev);
}

module_init(au1xpsc_sample_ac97_load);
module_exit(au1xpsc_sample_ac97_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Au1xxx PSC sample AC97 machine");
MODULE_AUTHOR("Manuel Lauss <mano@roarinelk.homelinux.net>");

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