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
  27 struct onenand_info {
  28         struct mtd_info         mtd;
  29         struct onenand_chip     onenand;
  30 };
  31
  32 static 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
  73 out_iounmap:
  74         iounmap(info->onenand.base);
  75 out_release_mem_region:
  76         release_mem_region(res->start, size);
  77 out_free_info:
  78         kfree(info);
  79
  80         return err;
  81 }
  82
  83 static 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
  99 static 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
 107 module_platform_driver(generic_onenand_driver);
 108
 109 MODULE_LICENSE("GPL");
 110 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
 111 MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
 112 MODULE_ALIAS("platform:" DRIVER_NAME);