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 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 onenand_platform_data *pdata = pdev->dev.platform_data;
  43         struct resource *res = pdev->resource;
  44         unsigned long size = resource_size(res);
  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, dev_name(&pdev->dev))) {
  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 ? pdata->mmcontrol : 0;
  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         err = parse_mtd_partitions(&info->mtd, NULL, &info->parts, 0);
  75         if (err > 0)
  76                 mtd_device_register(&info->mtd, info->parts, err);
  77         else if (err <= 0 && pdata && pdata->parts)
  78                 mtd_device_register(&info->mtd, pdata->parts, pdata->nr_parts);
  79         else
  80                 err = mtd_device_register(&info->mtd, NULL, 0);
  81
  82         platform_set_drvdata(pdev, info);
  83
  84         return 0;
  85
  86 out_iounmap:
  87         iounmap(info->onenand.base);
  88 out_release_mem_region:
  89         release_mem_region(res->start, size);
  90 out_free_info:
  91         kfree(info);
  92
  93         return err;
  94 }
  95
  96 static int __devexit generic_onenand_remove(struct platform_device *pdev)
  97 {
  98         struct onenand_info *info = platform_get_drvdata(pdev);
  99         struct resource *res = pdev->resource;
 100         unsigned long size = resource_size(res);
 101
 102         platform_set_drvdata(pdev, NULL);
 103
 104         if (info) {
 105                 mtd_device_unregister(&info->mtd);
 106                 onenand_release(&info->mtd);
 107                 release_mem_region(res->start, size);
 108                 iounmap(info->onenand.base);
 109                 kfree(info);
 110         }
 111
 112         return 0;
 113 }
 114
 115 static struct platform_driver generic_onenand_driver = {
 116         .driver = {
 117                 .name           = DRIVER_NAME,
 118                 .owner          = THIS_MODULE,
 119         },
 120         .probe          = generic_onenand_probe,
 121         .remove         = __devexit_p(generic_onenand_remove),
 122 };
 123
 124 MODULE_ALIAS("platform:" DRIVER_NAME);
 125
 126 static int __init generic_onenand_init(void)
 127 {
 128         return platform_driver_register(&generic_onenand_driver);
 129 }
 130
 131 static void __exit generic_onenand_exit(void)
 132 {
 133         platform_driver_unregister(&generic_onenand_driver);
 134 }
 135
 136 module_init(generic_onenand_init);
 137 module_exit(generic_onenand_exit);
 138
 139 MODULE_LICENSE("GPL");
 140 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 141 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");