drivers/mtd/nand/onenand/generic.c

   1 /*
   2  *  Copyright (c) 2005 Samsung Electronics
   3  *  Kyungmin Park <kyungmin.park@samsung.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  *  Overview:
  10  *   This is a device driver for the OneNAND flash for generic boards.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/slab.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/onenand.h>
  18 #include <linux/mtd/partitions.h>
  19 #include <linux/io.h>
  20
  21 /*
  22  * Note: Driver name and platform data format have been updated!
  23  *
  24  * This version of the driver is named "onenand-flash" and takes struct
  25  * onenand_platform_data as platform data. The old ARM-specific version
  26  * with the name "onenand" used to take struct flash_platform_data.
  27  */
  28 #define DRIVER_NAME     "onenand-flash"
  29
  30 struct onenand_info {
  31         struct mtd_info         mtd;
  32         struct onenand_chip     onenand;
  33 };
  34
  35 static int generic_onenand_probe(struct platform_device *pdev)
  36 {
  37         struct onenand_info *info;
  38         struct onenand_platform_data *pdata = dev_get_platdata(&pdev->dev);
  39         struct resource *res = pdev->resource;
  40         unsigned long size = resource_size(res);
  41         int err;
  42
  43         info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
  44         if (!info)
  45                 return -ENOMEM;
  46
  47         if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
  48                 err = -EBUSY;
  49                 goto out_free_info;
  50         }
  51
  52         info->onenand.base = ioremap(res->start, size);
  53         if (!info->onenand.base) {
  54                 err = -ENOMEM;
  55                 goto out_release_mem_region;
  56         }
  57
  58         info->onenand.mmcontrol = pdata ? pdata->mmcontrol : NULL;
  59         info->onenand.irq = platform_get_irq(pdev, 0);
  60
  61         info->mtd.dev.parent = &pdev->dev;
  62         info->mtd.priv = &info->onenand;
  63
  64         if (onenand_scan(&info->mtd, 1)) {
  65                 err = -ENXIO;
  66                 goto out_iounmap;
  67         }
  68
  69         err = mtd_device_register(&info->mtd, pdata ? pdata->parts : NULL,
  70                                   pdata ? pdata->nr_parts : 0);
  71
  72         platform_set_drvdata(pdev, info);
  73
  74         return 0;
  75
  76 out_iounmap:
  77         iounmap(info->onenand.base);
  78 out_release_mem_region:
  79         release_mem_region(res->start, size);
  80 out_free_info:
  81         kfree(info);
  82
  83         return err;
  84 }
  85
  86 static int generic_onenand_remove(struct platform_device *pdev)
  87 {
  88         struct onenand_info *info = platform_get_drvdata(pdev);
  89         struct resource *res = pdev->resource;
  90         unsigned long size = resource_size(res);
  91
  92         if (info) {
  93                 onenand_release(&info->mtd);
  94                 release_mem_region(res->start, size);
  95                 iounmap(info->onenand.base);
  96                 kfree(info);
  97         }
  98
  99         return 0;
 100 }
 101
 102 static struct platform_driver generic_onenand_driver = {
 103         .driver = {
 104                 .name           = DRIVER_NAME,
 105         },
 106         .probe          = generic_onenand_probe,
 107         .remove         = generic_onenand_remove,
 108 };
 109
 110 module_platform_driver(generic_onenand_driver);
 111
 112 MODULE_LICENSE("GPL");
 113 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 114 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
 115 MODULE_ALIAS("platform:" DRIVER_NAME);