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 static const char *part_probes[] = { "cmdlinepart", NULL,  };
  34
  35 struct onenand_info {
  36         struct mtd_info         mtd;
  37         struct mtd_partition    *parts;
  38         struct onenand_chip     onenand;
  39 };
  40
  41 static int __devinit generic_onenand_probe(struct platform_device *pdev)
  42 {
  43         struct onenand_info *info;
  44         struct onenand_platform_data *pdata = pdev->dev.platform_data;
  45         struct resource *res = pdev->resource;
  46         unsigned long size = resource_size(res);
  47         int err;
  48
  49         info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
  50         if (!info)
  51                 return -ENOMEM;
  52
  53         if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
  54                 err = -EBUSY;
  55                 goto out_free_info;
  56         }
  57
  58         info->onenand.base = ioremap(res->start, size);
  59         if (!info->onenand.base) {
  60                 err = -ENOMEM;
  61                 goto out_release_mem_region;
  62         }
  63
  64         info->onenand.mmcontrol = pdata ? pdata->mmcontrol : 0;
  65         info->onenand.irq = platform_get_irq(pdev, 0);
  66
  67         info->mtd.name = dev_name(&pdev->dev);
  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         err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
  77         if (err > 0)
  78                 mtd_device_register(&info->mtd, info->parts, err);
  79         else if (err <= 0 && pdata && pdata->parts)
  80                 mtd_device_register(&info->mtd, pdata->parts, pdata->nr_parts);
  81         else
  82                 err = mtd_device_register(&info->mtd, NULL, 0);
  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 = resource_size(res);
 103
 104         platform_set_drvdata(pdev, NULL);
 105
 106         if (info) {
 107                 mtd_device_unregister(&info->mtd);
 108                 onenand_release(&info->mtd);
 109                 release_mem_region(res->start, size);
 110                 iounmap(info->onenand.base);
 111                 kfree(info);
 112         }
 113
 114         return 0;
 115 }
 116
 117 static struct platform_driver generic_onenand_driver = {
 118         .driver = {
 119                 .name           = DRIVER_NAME,
 120                 .owner          = THIS_MODULE,
 121         },
 122         .probe          = generic_onenand_probe,
 123         .remove         = __devexit_p(generic_onenand_remove),
 124 };
 125
 126 MODULE_ALIAS("platform:" DRIVER_NAME);
 127
 128 static int __init generic_onenand_init(void)
 129 {
 130         return platform_driver_register(&generic_onenand_driver);
 131 }
 132
 133 static void __exit generic_onenand_exit(void)
 134 {
 135         platform_driver_unregister(&generic_onenand_driver);
 136 }
 137
 138 module_init(generic_onenand_init);
 139 module_exit(generic_onenand_exit);
 140
 141 MODULE_LICENSE("GPL");
 142 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 143 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");