drivers/mtd/maps/edb7312.c

   1 /*
   2  * $Id: edb7312.c,v 1.14 2005/11/07 11:14:27 gleixner Exp $
   3  *
   4  * Handle mapping of the NOR flash on Cogent EDB7312 boards
   5  *
   6  * Copyright 2002 SYSGO Real-Time Solutions GmbH
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <asm/io.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/map.h>
  20 #include <linux/config.h>
  21
  22 #ifdef CONFIG_MTD_PARTITIONS
  23 #include <linux/mtd/partitions.h>
  24 #endif
  25
  26 #define WINDOW_ADDR 0x00000000      /* physical properties of flash */
  27 #define WINDOW_SIZE 0x01000000
  28 #define BUSWIDTH    2
  29 #define FLASH_BLOCKSIZE_MAIN    0x20000
  30 #define FLASH_NUMBLOCKS_MAIN    128
  31 /* can be "cfi_probe", "jedec_probe", "map_rom", NULL }; */
  32 #define PROBETYPES { "cfi_probe", NULL }
  33
  34 #define MSG_PREFIX "EDB7312-NOR:"   /* prefix for our printk()'s */
  35 #define MTDID      "edb7312-nor"    /* for mtdparts= partitioning */
  36
  37 static struct mtd_info *mymtd;
  38
  39 struct map_info edb7312nor_map = {
  40         .name = "NOR flash on EDB7312",
  41         .size = WINDOW_SIZE,
  42         .bankwidth = BUSWIDTH,
  43         .phys = WINDOW_ADDR,
  44 };
  45
  46 #ifdef CONFIG_MTD_PARTITIONS
  47
  48 /*
  49  * MTD partitioning stuff
  50  */
  51 static struct mtd_partition static_partitions[3] =
  52 {
  53         {
  54                 .name = "ARMboot",
  55                 .size = 0x40000,
  56                 .offset = 0
  57         },
  58         {
  59                 .name = "Kernel",
  60                 .size = 0x200000,
  61                 .offset = 0x40000
  62         },
  63         {
  64                 .name = "RootFS",
  65                 .size = 0xDC0000,
  66                 .offset = 0x240000
  67         },
  68 };
  69
  70 static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
  71
  72 #endif
  73
  74 static int                   mtd_parts_nb = 0;
  75 static struct mtd_partition *mtd_parts    = 0;
  76
  77 int __init init_edb7312nor(void)
  78 {
  79         static const char *rom_probe_types[] = PROBETYPES;
  80         const char **type;
  81         const char *part_type = 0;
  82
  83         printk(KERN_NOTICE MSG_PREFIX "0x%08x at 0x%08x\n",
  84                WINDOW_SIZE, WINDOW_ADDR);
  85         edb7312nor_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
  86
  87         if (!edb7312nor_map.virt) {
  88                 printk(MSG_PREFIX "failed to ioremap\n");
  89                 return -EIO;
  90         }
  91
  92         simple_map_init(&edb7312nor_map);
  93
  94         mymtd = 0;
  95         type = rom_probe_types;
  96         for(; !mymtd && *type; type++) {
  97                 mymtd = do_map_probe(*type, &edb7312nor_map);
  98         }
  99         if (mymtd) {
 100                 mymtd->owner = THIS_MODULE;
 101
 102 #ifdef CONFIG_MTD_PARTITIONS
 103                 mtd_parts_nb = parse_mtd_partitions(mymtd, probes, &mtd_parts, MTDID);
 104                 if (mtd_parts_nb > 0)
 105                   part_type = "detected";
 106
 107                 if (mtd_parts_nb == 0)
 108                 {
 109                         mtd_parts = static_partitions;
 110                         mtd_parts_nb = ARRAY_SIZE(static_partitions);
 111                         part_type = "static";
 112                 }
 113 #endif
 114                 add_mtd_device(mymtd);
 115                 if (mtd_parts_nb == 0)
 116                   printk(KERN_NOTICE MSG_PREFIX "no partition info available\n");
 117                 else
 118                 {
 119                         printk(KERN_NOTICE MSG_PREFIX
 120                                "using %s partition definition\n", part_type);
 121                         add_mtd_partitions(mymtd, mtd_parts, mtd_parts_nb);
 122                 }
 123                 return 0;
 124         }
 125
 126         iounmap((void *)edb7312nor_map.virt);
 127         return -ENXIO;
 128 }
 129
 130 static void __exit cleanup_edb7312nor(void)
 131 {
 132         if (mymtd) {
 133                 del_mtd_device(mymtd);
 134                 map_destroy(mymtd);
 135         }
 136         if (edb7312nor_map.virt) {
 137                 iounmap((void *)edb7312nor_map.virt);
 138                 edb7312nor_map.virt = 0;
 139         }
 140 }
 141
 142 module_init(init_edb7312nor);
 143 module_exit(cleanup_edb7312nor);
 144
 145 MODULE_LICENSE("GPL");
 146 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
 147 MODULE_DESCRIPTION("Generic configurable MTD map driver");