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 #include <asm/io.h>
  23
  24 /*
  25  * Note: Driver name and platform data format have been updated!
  26  *
  27  * This version of the driver is named "onenand-flash" and takes struct
  28  * onenand_platform_data as platform data. The old ARM-specific version
  29  * with the name "onenand" used to take struct flash_platform_data.
  30  */
  31 #define DRIVER_NAME     "onenand-flash"
  32
  33 #ifdef CONFIG_MTD_PARTITIONS
  34 static const char *part_probes[] = { "cmdlinepart", NULL,  };
  35 #endif
  36
  37 struct onenand_info {
  38         struct mtd_info         mtd;
  39         struct mtd_partition    *parts;
  40         struct onenand_chip     onenand;
  41 };
  42
  43 static int __devinit generic_onenand_probe(struct platform_device *pdev)
  44 {
  45         struct onenand_info *info;
  46         struct onenand_platform_data *pdata = pdev->dev.platform_data;
  47         struct resource *res = pdev->resource;
  48         unsigned long size = resource_size(res);
  49         int err;
  50
  51         info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
  52         if (!info)
  53                 return -ENOMEM;
  54
  55         if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
  56                 err = -EBUSY;
  57                 goto out_free_info;
  58         }
  59
  60         info->onenand.base = ioremap(res->start, size);
  61         if (!info->onenand.base) {
  62                 err = -ENOMEM;
  63                 goto out_release_mem_region;
  64         }
  65
  66         info->onenand.mmcontrol = pdata ? pdata->mmcontrol : 0;
  67         info->onenand.irq = platform_get_irq(pdev, 0);
  68
  69         info->mtd.name = dev_name(&pdev->dev);
  70         info->mtd.priv = &info->onenand;
  71         info->mtd.owner = THIS_MODULE;
  72
  73         if (onenand_scan(&info->mtd, 1)) {
  74                 err = -ENXIO;
  75                 goto out_iounmap;
  76         }
  77
  78 #ifdef CONFIG_MTD_PARTITIONS
  79         err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
  80         if (err > 0)
  81                 add_mtd_partitions(&info->mtd, info->parts, err);
  82         else if (err <= 0 && pdata && pdata->parts)
  83                 add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
  84         else
  85 #endif
  86                 err = add_mtd_device(&info->mtd);
  87
  88         platform_set_drvdata(pdev, info);
  89
  90         return 0;
  91
  92 out_iounmap:
  93         iounmap(info->onenand.base);
  94 out_release_mem_region:
  95         release_mem_region(res->start, size);
  96 out_free_info:
  97         kfree(info);
  98
  99         return err;
 100 }
 101
 102 static int __devexit generic_onenand_remove(struct platform_device *pdev)
 103 {
 104         struct onenand_info *info = platform_get_drvdata(pdev);
 105         struct resource *res = pdev->resource;
 106         unsigned long size = resource_size(res);
 107
 108         platform_set_drvdata(pdev, NULL);
 109
 110         if (info) {
 111                 if (info->parts)
 112                         del_mtd_partitions(&info->mtd);
 113                 else
 114                         del_mtd_device(&info->mtd);
 115
 116                 onenand_release(&info->mtd);
 117                 release_mem_region(res->start, size);
 118                 iounmap(info->onenand.base);
 119                 kfree(info);
 120         }
 121
 122         return 0;
 123 }
 124
 125 static struct platform_driver generic_onenand_driver = {
 126         .driver = {
 127                 .name           = DRIVER_NAME,
 128                 .owner          = THIS_MODULE,
 129         },
 130         .probe          = generic_onenand_probe,
 131         .remove         = __devexit_p(generic_onenand_remove),
 132 };
 133
 134 MODULE_ALIAS(DRIVER_NAME);
 135
 136 static int __init generic_onenand_init(void)
 137 {
 138         return platform_driver_register(&generic_onenand_driver);
 139 }
 140
 141 static void __exit generic_onenand_exit(void)
 142 {
 143         platform_driver_unregister(&generic_onenand_driver);
 144 }
 145
 146 module_init(generic_onenand_init);
 147 module_exit(generic_onenand_exit);
 148
 149 MODULE_LICENSE("GPL");
 150 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 151 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");