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/init.h>
  17 #include <linux/slab.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/onenand.h>
  21 #include <linux/mtd/partitions.h>
  22
  23 #include <asm/io.h>
  24 #include <asm/mach/flash.h>
  25
  26 #define DRIVER_NAME     "onenand"
  27
  28
  29 #ifdef CONFIG_MTD_PARTITIONS
  30 static const char *part_probes[] = { "cmdlinepart", NULL,  };
  31 #endif
  32
  33 struct onenand_info {
  34         struct mtd_info         mtd;
  35         struct mtd_partition    *parts;
  36         struct onenand_chip     onenand;
  37 };
  38
  39 static int __devinit generic_onenand_probe(struct platform_device *pdev)
  40 {
  41         struct onenand_info *info;
  42         struct flash_platform_data *pdata = pdev->dev.platform_data;
  43         struct resource *res = pdev->resource;
  44         unsigned long size = res->end - res->start + 1;
  45         int err;
  46
  47         info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
  48         if (!info)
  49                 return -ENOMEM;
  50
  51         if (!request_mem_region(res->start, size, pdev->dev.driver->name)) {
  52                 err = -EBUSY;
  53                 goto out_free_info;
  54         }
  55
  56         info->onenand.base = ioremap(res->start, size);
  57         if (!info->onenand.base) {
  58                 err = -ENOMEM;
  59                 goto out_release_mem_region;
  60         }
  61
  62         info->onenand.mmcontrol = pdata->mmcontrol;
  63         info->onenand.irq = platform_get_irq(pdev, 0);
  64
  65         info->mtd.name = dev_name(&pdev->dev);
  66         info->mtd.priv = &info->onenand;
  67         info->mtd.owner = THIS_MODULE;
  68
  69         if (onenand_scan(&info->mtd, 1)) {
  70                 err = -ENXIO;
  71                 goto out_iounmap;
  72         }
  73
  74 #ifdef CONFIG_MTD_PARTITIONS
  75         err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
  76         if (err > 0)
  77                 add_mtd_partitions(&info->mtd, info->parts, err);
  78         else if (err <= 0 && pdata->parts)
  79                 add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
  80         else
  81 #endif
  82                 err = add_mtd_device(&info->mtd);
  83
  84         platform_set_drvdata(pdev, info);
  85
  86         return 0;
  87
  88 out_iounmap:
  89         iounmap(info->onenand.base);
  90 out_release_mem_region:
  91         release_mem_region(res->start, size);
  92 out_free_info:
  93         kfree(info);
  94
  95         return err;
  96 }
  97
  98 static int __devexit generic_onenand_remove(struct platform_device *pdev)
  99 {
 100         struct onenand_info *info = platform_get_drvdata(pdev);
 101         struct resource *res = pdev->resource;
 102         unsigned long size = res->end - res->start + 1;
 103
 104         platform_set_drvdata(pdev, NULL);
 105
 106         if (info) {
 107                 if (info->parts)
 108                         del_mtd_partitions(&info->mtd);
 109                 else
 110                         del_mtd_device(&info->mtd);
 111
 112                 onenand_release(&info->mtd);
 113                 release_mem_region(res->start, size);
 114                 iounmap(info->onenand.base);
 115                 kfree(info);
 116         }
 117
 118         return 0;
 119 }
 120
 121 static struct platform_driver generic_onenand_driver = {
 122         .driver = {
 123                 .name           = DRIVER_NAME,
 124                 .owner          = THIS_MODULE,
 125         },
 126         .probe          = generic_onenand_probe,
 127         .remove         = __devexit_p(generic_onenand_remove),
 128 };
 129
 130 MODULE_ALIAS(DRIVER_NAME);
 131
 132 static int __init generic_onenand_init(void)
 133 {
 134         return platform_driver_register(&generic_onenand_driver);
 135 }
 136
 137 static void __exit generic_onenand_exit(void)
 138 {
 139         platform_driver_unregister(&generic_onenand_driver);
 140 }
 141
 142 module_init(generic_onenand_init);
 143 module_exit(generic_onenand_exit);
 144
 145 MODULE_LICENSE("GPL");
 146 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 147 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");