release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/mtd/maps/edb7312.c

   1 /*
   2  * Handle mapping of the NOR flash on Cogent EDB7312 boards
   3  *
   4  * Copyright 2002 SYSGO Real-Time Solutions GmbH
   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
  11 #include <linux/module.h>
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15 #include <asm/io.h>
  16 #include <linux/mtd/mtd.h>
  17 #include <linux/mtd/map.h>
  18
  19 #ifdef CONFIG_MTD_PARTITIONS
  20 #include <linux/mtd/partitions.h>
  21 #endif
  22
  23 #define WINDOW_ADDR 0x00000000      /* physical properties of flash */
  24 #define WINDOW_SIZE 0x01000000
  25 #define BUSWIDTH    2
  26 #define FLASH_BLOCKSIZE_MAIN    0x20000
  27 #define FLASH_NUMBLOCKS_MAIN    128
  28 /* can be "cfi_probe", "jedec_probe", "map_rom", NULL }; */
  29 #define PROBETYPES { "cfi_probe", NULL }
  30
  31 #define MSG_PREFIX "EDB7312-NOR:"   /* prefix for our printk()'s */
  32 #define MTDID      "edb7312-nor"    /* for mtdparts= partitioning */
  33
  34 static struct mtd_info *mymtd;
  35
  36 struct map_info edb7312nor_map = {
  37         .name = "NOR flash on EDB7312",
  38         .size = WINDOW_SIZE,
  39         .bankwidth = BUSWIDTH,
  40         .phys = WINDOW_ADDR,
  41 };
  42
  43 #ifdef CONFIG_MTD_PARTITIONS
  44
  45 /*
  46  * MTD partitioning stuff
  47  */
  48 static struct mtd_partition static_partitions[3] =
  49 {
  50         {
  51                 .name = "ARMboot",
  52                 .size = 0x40000,
  53                 .offset = 0
  54         },
  55         {
  56                 .name = "Kernel",
  57                 .size = 0x200000,
  58                 .offset = 0x40000
  59         },
  60         {
  61                 .name = "RootFS",
  62                 .size = 0xDC0000,
  63                 .offset = 0x240000
  64         },
  65 };
  66
  67 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  68
  69 #endif
  70
  71 static int                   mtd_parts_nb = 0;
  72 static struct mtd_partition *mtd_parts    = 0;
  73
  74 static int __init init_edb7312nor(void)
  75 {
  76         static const char *rom_probe_types[] = PROBETYPES;
  77         const char **type;
  78         const char *part_type = 0;
  79
  80         printk(KERN_NOTICE MSG_PREFIX "0x%08x at 0x%08x\n",
  81                WINDOW_SIZE, WINDOW_ADDR);
  82         edb7312nor_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
  83
  84         if (!edb7312nor_map.virt) {
  85                 printk(MSG_PREFIX "failed to ioremap\n");
  86                 return -EIO;
  87         }
  88
  89         simple_map_init(&edb7312nor_map);
  90
  91         mymtd = 0;
  92         type = rom_probe_types;
  93         for(; !mymtd && *type; type++) {
  94                 mymtd = do_map_probe(*type, &edb7312nor_map);
  95         }
  96         if (mymtd) {
  97                 mymtd->owner = THIS_MODULE;
  98
  99 #ifdef CONFIG_MTD_PARTITIONS
 100                 mtd_parts_nb = parse_mtd_partitions(mymtd, probes, &mtd_parts, MTDID);
 101                 if (mtd_parts_nb > 0)
 102                   part_type = "detected";
 103
 104                 if (mtd_parts_nb == 0)
 105                 {
 106                         mtd_parts = static_partitions;
 107                         mtd_parts_nb = ARRAY_SIZE(static_partitions);
 108                         part_type = "static";
 109                 }
 110 #endif
 111                 add_mtd_device(mymtd);
 112                 if (mtd_parts_nb == 0)
 113                   printk(KERN_NOTICE MSG_PREFIX "no partition info available\n");
 114                 else
 115                 {
 116                         printk(KERN_NOTICE MSG_PREFIX
 117                                "using %s partition definition\n", part_type);
 118                         add_mtd_partitions(mymtd, mtd_parts, mtd_parts_nb);
 119                 }
 120                 return 0;
 121         }
 122
 123         iounmap((void *)edb7312nor_map.virt);
 124         return -ENXIO;
 125 }
 126
 127 static void __exit cleanup_edb7312nor(void)
 128 {
 129         if (mymtd) {
 130                 del_mtd_device(mymtd);
 131                 map_destroy(mymtd);
 132         }
 133         if (edb7312nor_map.virt) {
 134                 iounmap((void *)edb7312nor_map.virt);
 135                 edb7312nor_map.virt = 0;
 136         }
 137 }
 138
 139 module_init(init_edb7312nor);
 140 module_exit(cleanup_edb7312nor);
 141
 142 MODULE_LICENSE("GPL");
 143 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
 144 MODULE_DESCRIPTION("Generic configurable MTD map driver");