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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  Copyright (c) 2005 Samsung Electronics
   4 *  Kyungmin Park <kyungmin.park@samsung.com>
   5 *
   6 *  Overview:
   7 *   This is a device driver for the OneNAND flash for generic boards.
   8 */
   9
  10#include <linux/module.h>
  11#include <linux/slab.h>
  12#include <linux/platform_device.h>
  13#include <linux/mtd/mtd.h>
  14#include <linux/mtd/onenand.h>
  15#include <linux/mtd/partitions.h>
  16#include <linux/io.h>
  17
  18/*
  19 * Note: Driver name and platform data format have been updated!
  20 *
  21 * This version of the driver is named "onenand-flash" and takes struct
  22 * onenand_platform_data as platform data. The old ARM-specific version
  23 * with the name "onenand" used to take struct flash_platform_data.
  24 */
  25#define DRIVER_NAME     "onenand-flash"
  26
  27struct onenand_info {
  28        struct mtd_info         mtd;
  29        struct onenand_chip     onenand;
  30};
  31
  32static int generic_onenand_probe(struct platform_device *pdev)
  33{
  34        struct onenand_info *info;
  35        struct onenand_platform_data *pdata = dev_get_platdata(&pdev->dev);
  36        struct resource *res = pdev->resource;
  37        unsigned long size = resource_size(res);
  38        int err;
  39
  40        info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
  41        if (!info)
  42                return -ENOMEM;
  43
  44        if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
  45                err = -EBUSY;
  46                goto out_free_info;
  47        }
  48
  49        info->onenand.base = ioremap(res->start, size);
  50        if (!info->onenand.base) {
  51                err = -ENOMEM;
  52                goto out_release_mem_region;
  53        }
  54
  55        info->onenand.mmcontrol = pdata ? pdata->mmcontrol : NULL;
  56        info->onenand.irq = platform_get_irq(pdev, 0);
  57
  58        info->mtd.dev.parent = &pdev->dev;
  59        info->mtd.priv = &info->onenand;
  60
  61        if (onenand_scan(&info->mtd, 1)) {
  62                err = -ENXIO;
  63                goto out_iounmap;
  64        }
  65
  66        err = mtd_device_register(&info->mtd, pdata ? pdata->parts : NULL,
  67                                  pdata ? pdata->nr_parts : 0);
  68
  69        platform_set_drvdata(pdev, info);
  70
  71        return 0;
  72
  73out_iounmap:
  74        iounmap(info->onenand.base);
  75out_release_mem_region:
  76        release_mem_region(res->start, size);
  77out_free_info:
  78        kfree(info);
  79
  80        return err;
  81}
  82
  83static int generic_onenand_remove(struct platform_device *pdev)
  84{
  85        struct onenand_info *info = platform_get_drvdata(pdev);
  86        struct resource *res = pdev->resource;
  87        unsigned long size = resource_size(res);
  88
  89        if (info) {
  90                onenand_release(&info->mtd);
  91                release_mem_region(res->start, size);
  92                iounmap(info->onenand.base);
  93                kfree(info);
  94        }
  95
  96        return 0;
  97}
  98
  99static struct platform_driver generic_onenand_driver = {
 100        .driver = {
 101                .name           = DRIVER_NAME,
 102        },
 103        .probe          = generic_onenand_probe,
 104        .remove         = generic_onenand_remove,
 105};
 106
 107module_platform_driver(generic_onenand_driver);
 108
 109MODULE_LICENSE("GPL");
 110MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 111MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
 112MODULE_ALIAS("platform:" DRIVER_NAME);
 113