LXR linux/drivers/mtd/nand/onenand/generic.c

   1/*
   2 *  Copyright (c) 2005 Samsung Electronics
   3 *  Kyungmin Park <kyungmin.park@samsung.com>
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License version 2 as
   7 * published by the Free Software Foundation.
   8 *
   9 *  Overview:
  10 *   This is a device driver for the OneNAND flash for generic boards.
  11 */
  12
  13#include <linux/module.h>
  14#include <linux/slab.h>
  15#include <linux/platform_device.h>
  16#include <linux/mtd/mtd.h>
  17#include <linux/mtd/onenand.h>
  18#include <linux/mtd/partitions.h>
  19#include <linux/io.h>
  20
  21/*
  22 * Note: Driver name and platform data format have been updated!
  23 *
  24 * This version of the driver is named "onenand-flash" and takes struct
  25 * onenand_platform_data as platform data. The old ARM-specific version
  26 * with the name "onenand" used to take struct flash_platform_data.
  27 */
  28#define DRIVER_NAME     "onenand-flash"
  29
  30struct onenand_info {
  31        struct mtd_info         mtd;
  32        struct onenand_chip     onenand;
  33};
  34
  35static int generic_onenand_probe(struct platform_device *pdev)
  36{
  37        struct onenand_info *info;
  38        struct onenand_platform_data *pdata = dev_get_platdata(&pdev->dev);
  39        struct resource *res = pdev->resource;
  40        unsigned long size = resource_size(res);
  41        int err;
  42
  43        info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
  44        if (!info)
  45                return -ENOMEM;
  46
  47        if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
  48                err = -EBUSY;
  49                goto out_free_info;
  50        }
  51
  52        info->onenand.base = ioremap(res->start, size);
  53        if (!info->onenand.base) {
  54                err = -ENOMEM;
  55                goto out_release_mem_region;
  56        }
  57
  58        info->onenand.mmcontrol = pdata ? pdata->mmcontrol : NULL;
  59        info->onenand.irq = platform_get_irq(pdev, 0);
  60
  61        info->mtd.dev.parent = &pdev->dev;
  62        info->mtd.priv = &info->onenand;
  63
  64        if (onenand_scan(&info->mtd, 1)) {
  65                err = -ENXIO;
  66                goto out_iounmap;
  67        }
  68
  69        err = mtd_device_parse_register(&info->mtd, NULL, NULL,
  70                                        pdata ? pdata->parts : NULL,
  71                                        pdata ? pdata->nr_parts : 0);
  72
  73        platform_set_drvdata(pdev, info);
  74
  75        return 0;
  76
  77out_iounmap:
  78        iounmap(info->onenand.base);
  79out_release_mem_region:
  80        release_mem_region(res->start, size);
  81out_free_info:
  82        kfree(info);
  83
  84        return err;
  85}
  86
  87static int generic_onenand_remove(struct platform_device *pdev)
  88{
  89        struct onenand_info *info = platform_get_drvdata(pdev);
  90        struct resource *res = pdev->resource;
  91        unsigned long size = resource_size(res);
  92
  93        if (info) {
  94                onenand_release(&info->mtd);
  95                release_mem_region(res->start, size);
  96                iounmap(info->onenand.base);
  97                kfree(info);
  98        }
  99
 100        return 0;
 101}
 102
 103static struct platform_driver generic_onenand_driver = {
 104        .driver = {
 105                .name           = DRIVER_NAME,
 106        },
 107        .probe          = generic_onenand_probe,
 108        .remove         = generic_onenand_remove,
 109};
 110
 111module_platform_driver(generic_onenand_driver);
 112
 113MODULE_LICENSE("GPL");
 114MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 115MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
 116MODULE_ALIAS("platform:" DRIVER_NAME);
 117