/*
   * 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/io.h>

  #include <linux/module.h>

  #include <linux/platform_device.h>

  #include <linux/dmaengine.h>

  #include <linux/dma/pxa-dma.h>

  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/ac97_codec.h>
  #include <sound/initval.h>

  #include <sound/pxa2xx-lib.h>

  #include <sound/dmaengine_pcm.h>

  #include <mach/regs-ac97.h>

  #include <mach/audio.h>

  
  #include "pxa2xx-pcm.h"

  static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)

  {

  	if (!pxa2xx_ac97_try_cold_reset(ac97)) {
  		pxa2xx_ac97_try_warm_reset(ac97);

  	}

  	pxa2xx_ac97_finish_reset(ac97);

  }

  static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {

  	.read	= pxa2xx_ac97_read,
  	.write	= pxa2xx_ac97_write,
  	.reset	= pxa2xx_ac97_reset,
  };

  static struct pxad_param pxa2xx_ac97_pcm_out_req = {
  	.prio = PXAD_PRIO_LOWEST,
  	.drcmr = 12,
  };

  static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_out = {
  	.addr		= __PREG(PCDR),
  	.addr_width	= DMA_SLAVE_BUSWIDTH_4_BYTES,
  	.maxburst	= 32,
  	.filter_data	= &pxa2xx_ac97_pcm_out_req,

  };

  static struct pxad_param pxa2xx_ac97_pcm_in_req = {
  	.prio = PXAD_PRIO_LOWEST,
  	.drcmr = 11,
  };

  static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_in = {
  	.addr		= __PREG(PCDR),
  	.addr_width	= DMA_SLAVE_BUSWIDTH_4_BYTES,
  	.maxburst	= 32,
  	.filter_data	= &pxa2xx_ac97_pcm_in_req,

  };

  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_SLEEP

  static int pxa2xx_ac97_do_suspend(struct snd_card *card)

  {

  	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);

  	return pxa2xx_ac97_hw_suspend();

  }

  static int pxa2xx_ac97_do_resume(struct snd_card *card)

  {

  	pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;

  	int rc;
  
  	rc = pxa2xx_ac97_hw_resume();
  	if (rc)
  		return rc;

  	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 device *dev)

  {

  	struct snd_card *card = dev_get_drvdata(dev);

  	int ret = 0;

  	if (card)

  		ret = pxa2xx_ac97_do_suspend(card);

  
  	return ret;
  }

  static int pxa2xx_ac97_resume(struct device *dev)

  {

  	struct snd_card *card = dev_get_drvdata(dev);

  	int ret = 0;

  	if (card)

  		ret = pxa2xx_ac97_do_resume(card);

  
  	return ret;
  }

  static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);

  #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;

  	pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
  
  	if (dev->id >= 0) {
  		dev_err(&dev->dev, "PXA2xx has only one AC97 port.
  ");
  		ret = -ENXIO;
  		goto err_dev;
  	}

  	ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
  			   THIS_MODULE, 0, &card);

  	if (ret < 0)

  		goto err;

  	strlcpy(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 = pxa2xx_ac97_hw_probe(dev);
  	if (ret)

  		goto err;

  
  	ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
  	if (ret)

  		goto err_remove;

  	memset(&ac97_template, 0, sizeof(ac97_template));
  	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
  	if (ret)

  		goto err_remove;

  
  	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);

  	if (pdata && pdata->codec_pdata[0])

  		snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);

  	ret = snd_card_register(card);
  	if (ret == 0) {

  		platform_set_drvdata(dev, card);

  		return 0;
  	}

  err_remove:
  	pxa2xx_ac97_hw_remove(dev);
  err:

  	if (card)
  		snd_card_free(card);

  err_dev:

  	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);

  		pxa2xx_ac97_hw_remove(dev);

  	}
  
  	return 0;
  }

  static struct platform_driver pxa2xx_ac97_driver = {

  	.probe		= pxa2xx_ac97_probe,

  	.remove		= pxa2xx_ac97_remove,

  	.driver		= {
  		.name	= "pxa2xx-ac97",

  #ifdef CONFIG_PM_SLEEP

  		.pm	= &pxa2xx_ac97_pm_ops,
  #endif

  	},

  };

  module_platform_driver(pxa2xx_ac97_driver);

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

  MODULE_ALIAS("platform:pxa2xx-ac97");