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 onenand_chip     onenand;
  36 };
  37
  38 static int generic_onenand_probe(struct platform_device *pdev)
  39 {
  40         struct onenand_info *info;
  41         struct onenand_platform_data *pdata = pdev->dev.platform_data;
  42         struct resource *res = pdev->resource;
  43         unsigned long size = resource_size(res);
  44         int err;
  45
  46         info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
  47         if (!info)
  48                 return -ENOMEM;
  49
  50         if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
  51                 err = -EBUSY;
  52                 goto out_free_info;
  53         }
  54
  55         info->onenand.base = ioremap(res->start, size);
  56         if (!info->onenand.base) {
  57                 err = -ENOMEM;
  58                 goto out_release_mem_region;
  59         }
  60
  61         info->onenand.mmcontrol = pdata ? pdata->mmcontrol : 0;
  62         info->onenand.irq = platform_get_irq(pdev, 0);
  63
  64         info->mtd.name = dev_name(&pdev->dev);
  65         info->mtd.priv = &info->onenand;
  66         info->mtd.owner = THIS_MODULE;
  67
  68         if (onenand_scan(&info->mtd, 1)) {
  69                 err = -ENXIO;
  70                 goto out_iounmap;
  71         }
  72
  73         err = mtd_device_parse_register(&info->mtd, NULL, NULL,
  74                                         pdata ? pdata->parts : NULL,
  75                                         pdata ? pdata->nr_parts : 0);
  76
  77         platform_set_drvdata(pdev, info);
  78
  79         return 0;
  80
  81 out_iounmap:
  82         iounmap(info->onenand.base);
  83 out_release_mem_region:
  84         release_mem_region(res->start, size);
  85 out_free_info:
  86         kfree(info);
  87
  88         return err;
  89 }
  90
  91 static int generic_onenand_remove(struct platform_device *pdev)
  92 {
  93         struct onenand_info *info = platform_get_drvdata(pdev);
  94         struct resource *res = pdev->resource;
  95         unsigned long size = resource_size(res);
  96
  97         platform_set_drvdata(pdev, NULL);
  98
  99         if (info) {
 100                 onenand_release(&info->mtd);
 101                 release_mem_region(res->start, size);
 102                 iounmap(info->onenand.base);
 103                 kfree(info);
 104         }
 105
 106         return 0;
 107 }
 108
 109 static struct platform_driver generic_onenand_driver = {
 110         .driver = {
 111                 .name           = DRIVER_NAME,
 112                 .owner          = THIS_MODULE,
 113         },
 114         .probe          = generic_onenand_probe,
 115         .remove         = generic_onenand_remove,
 116 };
 117
 118 module_platform_driver(generic_onenand_driver);
 119
 120 MODULE_LICENSE("GPL");
 121 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 122 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
 123 MODULE_ALIAS("platform:" DRIVER_NAME);