text: /*
   * NAND Flash Controller Device Driver for DT
   *
   * Copyright © 2011, Picochip.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms and conditions of the GNU General Public License,
   * version 2, as published by the Free Software Foundation.
   *
   * This program is distributed in the hope 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.
   */
  #include <linux/clk.h>
  #include <linux/err.h>
  #include <linux/io.h>
  #include <linux/ioport.h>
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/platform_device.h>
  #include <linux/of.h>
  #include <linux/of_device.h>
  #include <linux/slab.h>
  
  #include "denali.h"
  
  struct denali_dt {
  	struct denali_nand_info	denali;
  	struct clk		*clk;
  };
  
  static const struct of_device_id denali_nand_dt_ids[] = {
  		{ .compatible = "denali,denali-nand-dt" },
  		{ /* sentinel */ }
  	};
  
  MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);
  
  static u64 denali_dma_mask;
  
  static int denali_dt_probe(struct platform_device *ofdev)
  {
  	struct resource *denali_reg, *nand_data;
  	struct denali_dt *dt;
  	struct denali_nand_info *denali;
  	int ret;
  	const struct of_device_id *of_id;
  
  	of_id = of_match_device(denali_nand_dt_ids, &ofdev->dev);
  	if (of_id) {
  		ofdev->id_entry = of_id->data;
  	} else {
  		pr_err("Failed to find the right device id.\n");
  		return -ENOMEM;
  	}
  
  	dt = devm_kzalloc(&ofdev->dev, sizeof(*dt), GFP_KERNEL);
  	if (!dt)
  		return -ENOMEM;
  	denali = &dt->denali;
  
  	denali->platform = DT;
  	denali->dev = &ofdev->dev;
  	denali->irq = platform_get_irq(ofdev, 0);
  	if (denali->irq < 0) {
  		dev_err(&ofdev->dev, "no irq defined\n");
  		return denali->irq;
  	}
  
  	denali_reg = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "denali_reg");
  	denali->flash_reg = devm_ioremap_resource(&ofdev->dev, denali_reg);
  	if (IS_ERR(denali->flash_reg))
  		return PTR_ERR(denali->flash_reg);
  
  	nand_data = platform_get_resource_byname(ofdev, IORESOURCE_MEM, "nand_data");
  	denali->flash_mem = devm_ioremap_resource(&ofdev->dev, nand_data);
  	if (IS_ERR(denali->flash_mem))
  		return PTR_ERR(denali->flash_mem);
  
  	if (!of_property_read_u32(ofdev->dev.of_node,
  		"dma-mask", (u32 *)&denali_dma_mask)) {
  		denali->dev->dma_mask = &denali_dma_mask;
  	} else {
  		denali->dev->dma_mask = NULL;
  	}
  
  	dt->clk = devm_clk_get(&ofdev->dev, NULL);
  	if (IS_ERR(dt->clk)) {
  		dev_err(&ofdev->dev, "no clk available\n");
  		return PTR_ERR(dt->clk);
  	}
  	clk_prepare_enable(dt->clk);
  
  	ret = denali_init(denali);
  	if (ret)
  		goto out_disable_clk;
  
  	platform_set_drvdata(ofdev, dt);
  	return 0;
  
  out_disable_clk:
  	clk_disable_unprepare(dt->clk);
  
  	return ret;
  }
  
  static int denali_dt_remove(struct platform_device *ofdev)
  {
  	struct denali_dt *dt = platform_get_drvdata(ofdev);
  
  	denali_remove(&dt->denali);
  	clk_disable(dt->clk);
  
  	return 0;
  }
  
  static struct platform_driver denali_dt_driver = {
  	.probe		= denali_dt_probe,
  	.remove		= denali_dt_remove,
  	.driver		= {
  		.name	= "denali-nand-dt",
  		.owner	= THIS_MODULE,
  		.of_match_table	= denali_nand_dt_ids,
  	},
  };
  
  module_platform_driver(denali_dt_driver);
  
  MODULE_LICENSE("GPL");
  MODULE_AUTHOR("Jamie Iles");
  MODULE_DESCRIPTION("DT driver for Denali NAND controller");
  