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 device *dev)
  40 {
  41         struct onenand_info *info;
  42         struct platform_device *pdev = to_platform_device(dev);
  43         struct flash_platform_data *pdata = pdev->dev.platform_data;
  44         struct resource *res = pdev->resource;
  45         unsigned long size = res->end - res->start + 1;
  46         int err;
  47
  48         info = kmalloc(sizeof(struct onenand_info), GFP_KERNEL);
  49         if (!info)
  50                 return -ENOMEM;
  51
  52         memset(info, 0, sizeof(struct onenand_info));
  53
  54         if (!request_mem_region(res->start, size, dev->driver->name)) {
  55                 err = -EBUSY;
  56                 goto out_free_info;
  57         }
  58
  59         info->onenand.base = ioremap(res->start, size);
  60         if (!info->onenand.base) {
  61                 err = -ENOMEM;
  62                 goto out_release_mem_region;
  63         }
  64
  65         info->onenand.mmcontrol = pdata->mmcontrol;
  66
  67         info->mtd.name = pdev->dev.bus_id;
  68         info->mtd.priv = &info->onenand;
  69         info->mtd.owner = THIS_MODULE;
  70
  71         if (onenand_scan(&info->mtd, 1)) {
  72                 err = -ENXIO;
  73                 goto out_iounmap;
  74         }
  75
  76 #ifdef CONFIG_MTD_PARTITIONS
  77         err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
  78         if (err > 0)
  79                 add_mtd_partitions(&info->mtd, info->parts, err);
  80         else if (err < 0 && pdata->parts)
  81                 add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
  82         else
  83 #endif
  84                 err = add_mtd_device(&info->mtd);
  85
  86         dev_set_drvdata(&pdev->dev, info);
  87
  88         return 0;
  89
  90 out_iounmap:
  91         iounmap(info->onenand.base);
  92 out_release_mem_region:
  93         release_mem_region(res->start, size);
  94 out_free_info:
  95         kfree(info);
  96
  97         return err;
  98 }
  99
 100 static int __devexit generic_onenand_remove(struct device *dev)
 101 {
 102         struct platform_device *pdev = to_platform_device(dev);
 103         struct onenand_info *info = dev_get_drvdata(&pdev->dev);
 104         struct resource *res = pdev->resource;
 105         unsigned long size = res->end - res->start + 1;
 106
 107         dev_set_drvdata(&pdev->dev, NULL);
 108
 109         if (info) {
 110                 if (info->parts)
 111                         del_mtd_partitions(&info->mtd);
 112                 else
 113                         del_mtd_device(&info->mtd);
 114
 115                 onenand_release(&info->mtd);
 116                 release_mem_region(res->start, size);
 117                 iounmap(info->onenand.base);
 118                 kfree(info);
 119         }
 120
 121         return 0;
 122 }
 123
 124 static struct device_driver generic_onenand_driver = {
 125         .name           = DRIVER_NAME,
 126         .bus            = &platform_bus_type,
 127         .probe          = generic_onenand_probe,
 128         .remove         = __devexit_p(generic_onenand_remove),
 129 };
 130
 131 MODULE_ALIAS(DRIVER_NAME);
 132
 133 static int __init generic_onenand_init(void)
 134 {
 135         return driver_register(&generic_onenand_driver);
 136 }
 137
 138 static void __exit generic_onenand_exit(void)
 139 {
 140         driver_unregister(&generic_onenand_driver);
 141 }
 142
 143 module_init(generic_onenand_init);
 144 module_exit(generic_onenand_exit);
 145
 146 MODULE_LICENSE("GPL");
 147 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 148 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");