drivers/mtd/maps/edb7312.c

   1 /*
   2  * $Id: edb7312.c,v 1.11 2004/07/14 09:52:55 dwmw2 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;
  75 static struct mtd_partition *mtd_parts;
  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 = NULL;
  82
  83         printk(KERN_NOTICE MSG_PREFIX "0x%08x at 0x%08x\n",
  84                WINDOW_SIZE, WINDOW_ADDR);
  85         edb7312nor_map.virt = (unsigned long)
  86           ioremap(WINDOW_ADDR, WINDOW_SIZE);
  87
  88         if (!edb7312nor_map.virt) {
  89                 printk(MSG_PREFIX "failed to ioremap\n");
  90                 return -EIO;
  91         }
  92
  93         simple_map_init(&edb7312nor_map);
  94
  95         mymtd = NULL;
  96         type = rom_probe_types;
  97         for(; !mymtd && *type; type++) {
  98                 mymtd = do_map_probe(*type, &edb7312nor_map);
  99         }
 100         if (mymtd) {
 101                 mymtd->owner = THIS_MODULE;
 102
 103 #ifdef CONFIG_MTD_PARTITIONS
 104                 mtd_parts_nb = parse_mtd_partitions(mymtd, probes, &mtd_parts, MTDID);
 105                 if (mtd_parts_nb > 0)
 106                   part_type = "detected";
 107
 108                 if (mtd_parts_nb == 0)
 109                 {
 110                         mtd_parts = static_partitions;
 111                         mtd_parts_nb = ARRAY_SIZE(static_partitions);
 112                         part_type = "static";
 113                 }
 114 #endif
 115                 add_mtd_device(mymtd);
 116                 if (mtd_parts_nb == 0)
 117                   printk(KERN_NOTICE MSG_PREFIX "no partition info available\n");
 118                 else
 119                 {
 120                         printk(KERN_NOTICE MSG_PREFIX
 121                                "using %s partition definition\n", part_type);
 122                         add_mtd_partitions(mymtd, mtd_parts, mtd_parts_nb);
 123                 }
 124                 return 0;
 125         }
 126
 127         iounmap((void *)edb7312nor_map.virt);
 128         return -ENXIO;
 129 }
 130
 131 static void __exit cleanup_edb7312nor(void)
 132 {
 133         if (mymtd) {
 134                 del_mtd_device(mymtd);
 135                 map_destroy(mymtd);
 136         }
 137         if (edb7312nor_map.virt) {
 138                 iounmap((void *)edb7312nor_map.virt);
 139                 edb7312nor_map.virt = 0;
 140         }
 141 }
 142
 143 module_init(init_edb7312nor);
 144 module_exit(cleanup_edb7312nor);
 145
 146 MODULE_LICENSE("GPL");
 147 MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
 148 MODULE_DESCRIPTION("Generic configurable MTD map driver");