kernel/drivers/mtd/maps/rbtx4939-flash.c

   1 /*
   2  * rbtx4939-flash (based on physmap.c)
   3  *
   4  * This is a simplified physmap driver with map_init callback function.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Copyright (C) 2009 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/device.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/map.h>
  21 #include <linux/mtd/partitions.h>
  22 #include <asm/txx9/rbtx4939.h>
  23
  24 struct rbtx4939_flash_info {
  25         struct mtd_info *mtd;
  26         struct map_info map;
  27 };
  28
  29 static int rbtx4939_flash_remove(struct platform_device *dev)
  30 {
  31         struct rbtx4939_flash_info *info;
  32
  33         info = platform_get_drvdata(dev);
  34         if (!info)
  35                 return 0;
  36
  37         if (info->mtd) {
  38                 mtd_device_unregister(info->mtd);
  39                 map_destroy(info->mtd);
  40         }
  41         return 0;
  42 }
  43
  44 static const char * const rom_probe_types[] = {
  45         "cfi_probe", "jedec_probe", NULL };
  46
  47 static int rbtx4939_flash_probe(struct platform_device *dev)
  48 {
  49         struct rbtx4939_flash_data *pdata;
  50         struct rbtx4939_flash_info *info;
  51         struct resource *res;
  52         const char * const *probe_type;
  53         int err = 0;
  54         unsigned long size;
  55
  56         pdata = dev_get_platdata(&dev->dev);
  57         if (!pdata)
  58                 return -ENODEV;
  59
  60         res = platform_get_resource(dev, IORESOURCE_MEM, 0);
  61         if (!res)
  62                 return -ENODEV;
  63         info = devm_kzalloc(&dev->dev, sizeof(struct rbtx4939_flash_info),
  64                             GFP_KERNEL);
  65         if (!info)
  66                 return -ENOMEM;
  67
  68         platform_set_drvdata(dev, info);
  69
  70         size = resource_size(res);
  71         pr_notice("rbtx4939 platform flash device: %pR\n", res);
  72
  73         if (!devm_request_mem_region(&dev->dev, res->start, size,
  74                                      dev_name(&dev->dev)))
  75                 return -EBUSY;
  76
  77         info->map.name = dev_name(&dev->dev);
  78         info->map.phys = res->start;
  79         info->map.size = size;
  80         info->map.bankwidth = pdata->width;
  81
  82         info->map.virt = devm_ioremap(&dev->dev, info->map.phys, size);
  83         if (!info->map.virt)
  84                 return -EBUSY;
  85
  86         if (pdata->map_init)
  87                 (*pdata->map_init)(&info->map);
  88         else
  89                 simple_map_init(&info->map);
  90
  91         probe_type = rom_probe_types;
  92         for (; !info->mtd && *probe_type; probe_type++)
  93                 info->mtd = do_map_probe(*probe_type, &info->map);
  94         if (!info->mtd) {
  95                 dev_err(&dev->dev, "map_probe failed\n");
  96                 err = -ENXIO;
  97                 goto err_out;
  98         }
  99         info->mtd->owner = THIS_MODULE;
 100         err = mtd_device_parse_register(info->mtd, NULL, NULL, pdata->parts,
 101                                         pdata->nr_parts);
 102
 103         if (err)
 104                 goto err_out;
 105         return 0;
 106
 107 err_out:
 108         rbtx4939_flash_remove(dev);
 109         return err;
 110 }
 111
 112 #ifdef CONFIG_PM
 113 static void rbtx4939_flash_shutdown(struct platform_device *dev)
 114 {
 115         struct rbtx4939_flash_info *info = platform_get_drvdata(dev);
 116
 117         if (mtd_suspend(info->mtd) == 0)
 118                 mtd_resume(info->mtd);
 119 }
 120 #else
 121 #define rbtx4939_flash_shutdown NULL
 122 #endif
 123
 124 static struct platform_driver rbtx4939_flash_driver = {
 125         .probe          = rbtx4939_flash_probe,
 126         .remove         = rbtx4939_flash_remove,
 127         .shutdown       = rbtx4939_flash_shutdown,
 128         .driver         = {
 129                 .name   = "rbtx4939-flash",
 130         },
 131 };
 132
 133 module_platform_driver(rbtx4939_flash_driver);
 134
 135 MODULE_LICENSE("GPL");
 136 MODULE_DESCRIPTION("RBTX4939 MTD map driver");
 137 MODULE_ALIAS("platform:rbtx4939-flash");