kernel/drivers/mtd/onenand/generic.c

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