text: /*
   * DaVinci Voice Codec Core Interface for TI platforms
   *
   * Copyright (C) 2010 Texas Instruments, Inc
   *
   * Author: Miguel Aguilar <miguel.aguilar@ridgerun.com>
   *
   * 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, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  
  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/device.h>
  #include <linux/slab.h>
  #include <linux/delay.h>
  #include <linux/io.h>
  #include <linux/clk.h>
  
  #include <sound/pcm.h>
  
  #include <linux/mfd/davinci_voicecodec.h>
  
  u32 davinci_vc_read(struct davinci_vc *davinci_vc, int reg)
  {
  	return __raw_readl(davinci_vc->base + reg);
  }
  
  void davinci_vc_write(struct davinci_vc *davinci_vc,
  					   int reg, u32 val)
  {
  	__raw_writel(val, davinci_vc->base + reg);
  }
  
  static int __init davinci_vc_probe(struct platform_device *pdev)
  {
  	struct davinci_vc *davinci_vc;
  	struct resource *res, *mem;
  	struct mfd_cell *cell = NULL;
  	int ret;
  
  	davinci_vc = kzalloc(sizeof(struct davinci_vc), GFP_KERNEL);
  	if (!davinci_vc) {
  		dev_dbg(&pdev->dev,
  			    "could not allocate memory for private data\n");
  		return -ENOMEM;
  	}
  
  	davinci_vc->clk = clk_get(&pdev->dev, NULL);
  	if (IS_ERR(davinci_vc->clk)) {
  		dev_dbg(&pdev->dev,
  			    "could not get the clock for voice codec\n");
  		ret = -ENODEV;
  		goto fail1;
  	}
  	clk_enable(davinci_vc->clk);
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	if (!res) {
  		dev_err(&pdev->dev, "no mem resource\n");
  		ret = -ENODEV;
  		goto fail2;
  	}
  
  	davinci_vc->pbase = res->start;
  	davinci_vc->base_size = resource_size(res);
  
  	mem = request_mem_region(davinci_vc->pbase, davinci_vc->base_size,
  				 pdev->name);
  	if (!mem) {
  		dev_err(&pdev->dev, "VCIF region already claimed\n");
  		ret = -EBUSY;
  		goto fail2;
  	}
  
  	davinci_vc->base = ioremap(davinci_vc->pbase, davinci_vc->base_size);
  	if (!davinci_vc->base) {
  		dev_err(&pdev->dev, "can't ioremap mem resource.\n");
  		ret = -ENOMEM;
  		goto fail3;
  	}
  
  	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
  	if (!res) {
  		dev_err(&pdev->dev, "no DMA resource\n");
  		ret = -ENXIO;
  		goto fail4;
  	}
  
  	davinci_vc->davinci_vcif.dma_tx_channel = res->start;
  	davinci_vc->davinci_vcif.dma_tx_addr =
  		(dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_WFIFO);
  
  	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
  	if (!res) {
  		dev_err(&pdev->dev, "no DMA resource\n");
  		ret = -ENXIO;
  		goto fail4;
  	}
  
  	davinci_vc->davinci_vcif.dma_rx_channel = res->start;
  	davinci_vc->davinci_vcif.dma_rx_addr =
  		(dma_addr_t)(io_v2p(davinci_vc->base) + DAVINCI_VC_RFIFO);
  
  	davinci_vc->dev = &pdev->dev;
  	davinci_vc->pdev = pdev;
  
  	/* Voice codec interface client */
  	cell = &davinci_vc->cells[DAVINCI_VC_VCIF_CELL];
  	cell->name = "davinci-vcif";
  	cell->platform_data = davinci_vc;
  	cell->pdata_size = sizeof(*davinci_vc);
  
  	/* Voice codec CQ93VC client */
  	cell = &davinci_vc->cells[DAVINCI_VC_CQ93VC_CELL];
  	cell->name = "cq93vc-codec";
  	cell->platform_data = davinci_vc;
  	cell->pdata_size = sizeof(*davinci_vc);
  
  	ret = mfd_add_devices(&pdev->dev, pdev->id, davinci_vc->cells,
  			      DAVINCI_VC_CELLS, NULL, 0);
  	if (ret != 0) {
  		dev_err(&pdev->dev, "fail to register client devices\n");
  		goto fail4;
  	}
  
  	return 0;
  
  fail4:
  	iounmap(davinci_vc->base);
  fail3:
  	release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
  fail2:
  	clk_disable(davinci_vc->clk);
  	clk_put(davinci_vc->clk);
  	davinci_vc->clk = NULL;
  fail1:
  	kfree(davinci_vc);
  
  	return ret;
  }
  
  static int __devexit davinci_vc_remove(struct platform_device *pdev)
  {
  	struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
  
  	mfd_remove_devices(&pdev->dev);
  
  	iounmap(davinci_vc->base);
  	release_mem_region(davinci_vc->pbase, davinci_vc->base_size);
  
  	clk_disable(davinci_vc->clk);
  	clk_put(davinci_vc->clk);
  	davinci_vc->clk = NULL;
  
  	kfree(davinci_vc);
  
  	return 0;
  }
  
  static struct platform_driver davinci_vc_driver = {
  	.driver	= {
  		.name = "davinci_voicecodec",
  		.owner = THIS_MODULE,
  	},
  	.remove	= __devexit_p(davinci_vc_remove),
  };
  
  static int __init davinci_vc_init(void)
  {
  	return platform_driver_probe(&davinci_vc_driver, davinci_vc_probe);
  }
  module_init(davinci_vc_init);
  
  static void __exit davinci_vc_exit(void)
  {
  	platform_driver_unregister(&davinci_vc_driver);
  }
  module_exit(davinci_vc_exit);
  
  MODULE_AUTHOR("Miguel Aguilar");
  MODULE_DESCRIPTION("Texas Instruments DaVinci Voice Codec Core Interface");
  MODULE_LICENSE("GPL");
  