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
  33struct onenand_info {
  34        struct mtd_info         mtd;
  35        struct onenand_chip     onenand;
  36};
  37
  38static 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
  81out_iounmap:
  82        iounmap(info->onenand.base);
  83out_release_mem_region:
  84        release_mem_region(res->start, size);
  85out_free_info:
  86        kfree(info);
  87
  88        return err;
  89}
  90
  91static 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
 109static 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
 118module_platform_driver(generic_onenand_driver);
 119
 120MODULE_LICENSE("GPL");
 121MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 122MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
 123MODULE_ALIAS("platform:" DRIVER_NAME);
 124