text: /*
   * File:         sound/soc/blackfin/bf5xx-tdm.c
   * Author:       Barry Song <Barry.Song@analog.com>
   *
   * Created:      Thurs June 04 2009
   * Description:  Blackfin I2S(TDM) CPU DAI driver
   *              Even though TDM mode can be as part of I2S DAI, but there
   *              are so much difference in configuration and data flow,
   *              it's very ugly to integrate I2S and TDM into a module
   *
   * Modified:
   *               Copyright 2009 Analog Devices Inc.
   *
   * Bugs:         Enter bugs at http://blackfin.uclinux.org/
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, see the file COPYING, or write
   * to the Free Software Foundation, Inc.,
   * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   */
  
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/device.h>
  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/pcm_params.h>
  #include <sound/initval.h>
  #include <sound/soc.h>
  
  #include <asm/irq.h>
  #include <asm/portmux.h>
  #include <linux/mutex.h>
  #include <linux/gpio.h>
  
  #include "bf5xx-sport.h"
  #include "bf5xx-tdm.h"
  
  static int bf5xx_tdm_set_dai_fmt(struct snd_soc_dai *cpu_dai,
  	unsigned int fmt)
  {
  	int ret = 0;
  
  	/* interface format:support TDM,slave mode */
  	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  	case SND_SOC_DAIFMT_DSP_A:
  		break;
  	default:
  		printk(KERN_ERR "%s: Unknown DAI format type\n", __func__);
  		ret = -EINVAL;
  		break;
  	}
  
  	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
  	case SND_SOC_DAIFMT_CBM_CFM:
  		break;
  	case SND_SOC_DAIFMT_CBS_CFS:
  	case SND_SOC_DAIFMT_CBM_CFS:
  	case SND_SOC_DAIFMT_CBS_CFM:
  		ret = -EINVAL;
  		break;
  	default:
  		printk(KERN_ERR "%s: Unknown DAI master type\n", __func__);
  		ret = -EINVAL;
  		break;
  	}
  
  	return ret;
  }
  
  static int bf5xx_tdm_hw_params(struct snd_pcm_substream *substream,
  	struct snd_pcm_hw_params *params,
  	struct snd_soc_dai *dai)
  {
  	struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
  	struct bf5xx_tdm_port *bf5xx_tdm = sport_handle->private_data;
  	int ret = 0;
  
  	bf5xx_tdm->tcr2 &= ~0x1f;
  	bf5xx_tdm->rcr2 &= ~0x1f;
  	switch (params_format(params)) {
  	case SNDRV_PCM_FORMAT_S32_LE:
  		bf5xx_tdm->tcr2 |= 31;
  		bf5xx_tdm->rcr2 |= 31;
  		sport_handle->wdsize = 4;
  		break;
  		/* at present, we only support 32bit transfer */
  	default:
  		pr_err("not supported PCM format yet\n");
  		return -EINVAL;
  		break;
  	}
  
  	if (!bf5xx_tdm->configured) {
  		/*
  		 * TX and RX are not independent,they are enabled at the
  		 * same time, even if only one side is running. So, we
  		 * need to configure both of them at the time when the first
  		 * stream is opened.
  		 *
  		 * CPU DAI:slave mode.
  		 */
  		ret = sport_config_rx(sport_handle, bf5xx_tdm->rcr1,
  			bf5xx_tdm->rcr2, 0, 0);
  		if (ret) {
  			pr_err("SPORT is busy!\n");
  			return -EBUSY;
  		}
  
  		ret = sport_config_tx(sport_handle, bf5xx_tdm->tcr1,
  			bf5xx_tdm->tcr2, 0, 0);
  		if (ret) {
  			pr_err("SPORT is busy!\n");
  			return -EBUSY;
  		}
  
  		bf5xx_tdm->configured = 1;
  	}
  
  	return 0;
  }
  
  static void bf5xx_tdm_shutdown(struct snd_pcm_substream *substream,
  	struct snd_soc_dai *dai)
  {
  	struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
  	struct bf5xx_tdm_port *bf5xx_tdm = sport_handle->private_data;
  
  	/* No active stream, SPORT is allowed to be configured again. */
  	if (!dai->active)
  		bf5xx_tdm->configured = 0;
  }
  
  static int bf5xx_tdm_set_channel_map(struct snd_soc_dai *dai,
  		unsigned int tx_num, unsigned int *tx_slot,
  		unsigned int rx_num, unsigned int *rx_slot)
  {
  	struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai);
  	struct bf5xx_tdm_port *bf5xx_tdm = sport_handle->private_data;
  	int i;
  	unsigned int slot;
  	unsigned int tx_mapped = 0, rx_mapped = 0;
  
  	if ((tx_num > BFIN_TDM_DAI_MAX_SLOTS) ||
  			(rx_num > BFIN_TDM_DAI_MAX_SLOTS))
  		return -EINVAL;
  
  	for (i = 0; i < tx_num; i++) {
  		slot = tx_slot[i];
  		if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
  				(!(tx_mapped & (1 << slot)))) {
  			bf5xx_tdm->tx_map[i] = slot;
  			tx_mapped |= 1 << slot;
  		} else
  			return -EINVAL;
  	}
  	for (i = 0; i < rx_num; i++) {
  		slot = rx_slot[i];
  		if ((slot < BFIN_TDM_DAI_MAX_SLOTS) &&
  				(!(rx_mapped & (1 << slot)))) {
  			bf5xx_tdm->rx_map[i] = slot;
  			rx_mapped |= 1 << slot;
  		} else
  			return -EINVAL;
  	}
  
  	return 0;
  }
  
  #ifdef CONFIG_PM
  static int bf5xx_tdm_suspend(struct snd_soc_dai *dai)
  {
  	struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
  
  	if (dai->playback_active)
  		sport_tx_stop(sport);
  	if (dai->capture_active)
  		sport_rx_stop(sport);
  
  	/* isolate sync/clock pins from codec while sports resume */
  	peripheral_free_list(sport->pin_req);
  
  	return 0;
  }
  
  static int bf5xx_tdm_resume(struct snd_soc_dai *dai)
  {
  	int ret;
  	struct sport_device *sport = snd_soc_dai_get_drvdata(dai);
  
  	ret = sport_set_multichannel(sport, 8, 0xFF, 1);
  	if (ret) {
  		pr_err("SPORT is busy!\n");
  		ret = -EBUSY;
  	}
  
  	ret = sport_config_rx(sport, 0, 0x1F, 0, 0);
  	if (ret) {
  		pr_err("SPORT is busy!\n");
  		ret = -EBUSY;
  	}
  
  	ret = sport_config_tx(sport, 0, 0x1F, 0, 0);
  	if (ret) {
  		pr_err("SPORT is busy!\n");
  		ret = -EBUSY;
  	}
  
  	peripheral_request_list(sport->pin_req, "soc-audio");
  
  	return 0;
  }
  
  #else
  #define bf5xx_tdm_suspend      NULL
  #define bf5xx_tdm_resume       NULL
  #endif
  
  static struct snd_soc_dai_ops bf5xx_tdm_dai_ops = {
  	.hw_params      = bf5xx_tdm_hw_params,
  	.set_fmt        = bf5xx_tdm_set_dai_fmt,
  	.shutdown       = bf5xx_tdm_shutdown,
  	.set_channel_map   = bf5xx_tdm_set_channel_map,
  };
  
  static struct snd_soc_dai_driver bf5xx_tdm_dai = {
  	.suspend = bf5xx_tdm_suspend,
  	.resume = bf5xx_tdm_resume,
  	.playback = {
  		.channels_min = 2,
  		.channels_max = 8,
  		.rates = SNDRV_PCM_RATE_48000,
  		.formats = SNDRV_PCM_FMTBIT_S32_LE,},
  	.capture = {
  		.channels_min = 2,
  		.channels_max = 8,
  		.rates = SNDRV_PCM_RATE_48000,
  		.formats = SNDRV_PCM_FMTBIT_S32_LE,},
  	.ops = &bf5xx_tdm_dai_ops,
  };
  
  static int __devinit bfin_tdm_probe(struct platform_device *pdev)
  {
  	struct sport_device *sport_handle;
  	int ret;
  
  	/* configure SPORT for TDM */
  	sport_handle = sport_init(pdev, 4, 8 * sizeof(u32),
  		sizeof(struct bf5xx_tdm_port));
  	if (!sport_handle)
  		return -ENODEV;
  
  	/* SPORT works in TDM mode */
  	ret = sport_set_multichannel(sport_handle, 8, 0xFF, 1);
  	if (ret) {
  		pr_err("SPORT is busy!\n");
  		ret = -EBUSY;
  		goto sport_config_err;
  	}
  
  	ret = sport_config_rx(sport_handle, 0, 0x1F, 0, 0);
  	if (ret) {
  		pr_err("SPORT is busy!\n");
  		ret = -EBUSY;
  		goto sport_config_err;
  	}
  
  	ret = sport_config_tx(sport_handle, 0, 0x1F, 0, 0);
  	if (ret) {
  		pr_err("SPORT is busy!\n");
  		ret = -EBUSY;
  		goto sport_config_err;
  	}
  
  	ret = snd_soc_register_dai(&pdev->dev, &bf5xx_tdm_dai);
  	if (ret) {
  		pr_err("Failed to register DAI: %d\n", ret);
  		goto sport_config_err;
  	}
  
  	return 0;
  
  sport_config_err:
  	sport_done(sport_handle);
  	return ret;
  }
  
  static int __devexit bfin_tdm_remove(struct platform_device *pdev)
  {
  	struct sport_device *sport_handle = platform_get_drvdata(pdev);
  
  	snd_soc_unregister_dai(&pdev->dev);
  	sport_done(sport_handle);
  
  	return 0;
  }
  
  static struct platform_driver bfin_tdm_driver = {
  	.probe  = bfin_tdm_probe,
  	.remove = __devexit_p(bfin_tdm_remove),
  	.driver = {
  		.name   = "bfin-tdm",
  		.owner  = THIS_MODULE,
  	},
  };
  
  static int __init bfin_tdm_init(void)
  {
  	return platform_driver_register(&bfin_tdm_driver);
  }
  module_init(bfin_tdm_init);
  
  static void __exit bfin_tdm_exit(void)
  {
  	platform_driver_unregister(&bfin_tdm_driver);
  }
  module_exit(bfin_tdm_exit);
  
  /* Module information */
  MODULE_AUTHOR("Barry Song");
  MODULE_DESCRIPTION("TDM driver for ADI Blackfin");
  MODULE_LICENSE("GPL");
  
  