LXR linux/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
  34static const char *part_probes[] = { "cmdlinepart", NULL,  };
  35#endif
  36
  37struct onenand_info {
  38        struct mtd_info         mtd;
  39        struct mtd_partition    *parts;
  40        struct onenand_chip     onenand;
  41};
  42
  43static 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
  92out_iounmap:
  93        iounmap(info->onenand.base);
  94out_release_mem_region:
  95        release_mem_region(res->start, size);
  96out_free_info:
  97        kfree(info);
  98
  99        return err;
 100}
 101
 102static 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
 125static 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
 134MODULE_ALIAS(DRIVER_NAME);
 135
 136static int __init generic_onenand_init(void)
 137{
 138        return platform_driver_register(&generic_onenand_driver);
 139}
 140
 141static void __exit generic_onenand_exit(void)
 142{
 143        platform_driver_unregister(&generic_onenand_driver);
 144}
 145
 146module_init(generic_onenand_init);
 147module_exit(generic_onenand_exit);
 148
 149MODULE_LICENSE("GPL");
 150MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 151MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
 152