// SPDX-License-Identifier: GPL-2.0-only

  /*
   * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
   *
   * Author:	Nicolas Pitre
   * Created:	Dec 02, 2004
   * Copyright:	MontaVista Software Inc.

   */
  
  #include <linux/init.h>

  #include <linux/io.h>

  #include <linux/module.h>

  #include <linux/platform_device.h>

  #include <linux/dmaengine.h>

  #include <linux/dma-mapping.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>

  static void pxa2xx_ac97_legacy_reset(struct snd_ac97 *ac97)

  {

  	if (!pxa2xx_ac97_try_cold_reset())
  		pxa2xx_ac97_try_warm_reset();

  	pxa2xx_ac97_finish_reset();
  }
  
  static unsigned short pxa2xx_ac97_legacy_read(struct snd_ac97 *ac97,
  					      unsigned short reg)
  {
  	int ret;
  
  	ret = pxa2xx_ac97_read(ac97->num, reg);
  	if (ret < 0)
  		return 0;
  	else
  		return (unsigned short)(ret & 0xffff);
  }
  
  static void pxa2xx_ac97_legacy_write(struct snd_ac97 *ac97,
  				     unsigned short reg, unsigned short val)
  {
  	int __always_unused ret;
  
  	ret = pxa2xx_ac97_write(ac97->num, reg, val);

  }

  static const struct snd_ac97_bus_ops pxa2xx_ac97_ops = {

  	.read	= pxa2xx_ac97_legacy_read,
  	.write	= pxa2xx_ac97_legacy_write,
  	.reset	= pxa2xx_ac97_legacy_reset,

  };

  static struct snd_pcm *pxa2xx_ac97_pcm;
  static struct snd_ac97 *pxa2xx_ac97_ac97;

  static int pxa2xx_ac97_pcm_open(struct snd_pcm_substream *substream)

  {

  	struct snd_pcm_runtime *runtime = substream->runtime;

  	pxa2xx_audio_ops_t *platform_ops;

  	int ret, i;

  	ret = pxa2xx_pcm_open(substream);

  	if (ret)
  		return ret;

  
  	runtime->hw.channels_min = 2;
  	runtime->hw.channels_max = 2;

  	i = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  		AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
  	runtime->hw.rates = pxa2xx_ac97_ac97->rates[i];

  	snd_pcm_limit_hw_rates(runtime);

  	platform_ops = substream->pcm->card->dev->platform_data;
  	if (platform_ops && platform_ops->startup) {
  		ret = platform_ops->startup(substream, platform_ops->priv);
  		if (ret < 0)

  			pxa2xx_pcm_close(substream);

  	}
  
  	return ret;

  }

  static int pxa2xx_ac97_pcm_close(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);

  
  	return 0;

  }

  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;

  	int ret;

  	ret = pxa2xx_pcm_prepare(substream);

  	if (ret < 0)
  		return ret;

  	return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
  }

  #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_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 const struct snd_pcm_ops pxa2xx_ac97_pcm_ops = {

  	.open		= pxa2xx_ac97_pcm_open,
  	.close		= pxa2xx_ac97_pcm_close,

  	.hw_params	= pxa2xx_pcm_hw_params,
  	.hw_free	= pxa2xx_pcm_hw_free,

  	.prepare	= pxa2xx_ac97_pcm_prepare,
  	.trigger	= pxa2xx_pcm_trigger,
  	.pointer	= pxa2xx_pcm_pointer,
  	.mmap		= pxa2xx_pcm_mmap,
  };
  
  
  static int pxa2xx_ac97_pcm_new(struct snd_card *card)
  {
  	struct snd_pcm *pcm;
  	int stream, ret;
  
  	ret = snd_pcm_new(card, "PXA2xx-PCM", 0, 1, 1, &pcm);
  	if (ret)
  		goto out;
  
  	pcm->private_free = pxa2xx_pcm_free_dma_buffers;
  
  	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
  	if (ret)
  		goto out;
  
  	stream = SNDRV_PCM_STREAM_PLAYBACK;

  	snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);

  	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
  	if (ret)
  		goto out;
  
  	stream = SNDRV_PCM_STREAM_CAPTURE;

  	snd_pcm_set_ops(pcm, stream, &pxa2xx_ac97_pcm_ops);

  	ret = pxa2xx_pcm_preallocate_dma_buffer(pcm, stream);
  	if (ret)
  		goto out;
  
  	pxa2xx_ac97_pcm = pcm;
  	ret = 0;
  
   out:
  	return ret;
  }

  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_ac97_pcm_new(card);

  	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");