drivers/mtd/maps/ocotea.c

   1 /*
   2  * Mapping for Ocotea user flash
   3  *
   4  * Matt Porter <mporter@kernel.crashing.org>
   5  *
   6  * Copyright 2002-2004 MontaVista Software Inc.
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/map.h>
  20 #include <linux/mtd/partitions.h>
  21 #include <linux/config.h>
  22 #include <asm/io.h>
  23 #include <asm/ibm44x.h>
  24 #include <platforms/4xx/ocotea.h>
  25
  26 static struct mtd_info *flash;
  27
  28 static struct map_info ocotea_small_map = {
  29         .name =         "Ocotea small flash",
  30         .size =         OCOTEA_SMALL_FLASH_SIZE,
  31         .buswidth =     1,
  32 };
  33
  34 static struct map_info ocotea_large_map = {
  35         .name =         "Ocotea large flash",
  36         .size =         OCOTEA_LARGE_FLASH_SIZE,
  37         .buswidth =     1,
  38 };
  39
  40 static struct mtd_partition ocotea_small_partitions[] = {
  41         {
  42                 .name =   "pibs",
  43                 .offset = 0x0,
  44                 .size =   0x100000,
  45         }
  46 };
  47
  48 static struct mtd_partition ocotea_large_partitions[] = {
  49         {
  50                 .name =   "fs",
  51                 .offset = 0,
  52                 .size =   0x300000,
  53         },
  54         {
  55                 .name =   "firmware",
  56                 .offset = 0x300000,
  57                 .size =   0x100000,
  58         }
  59 };
  60
  61 #define NB_OF(x)  (sizeof(x)/sizeof(x[0]))
  62
  63 int __init init_ocotea(void)
  64 {
  65         u8 fpga0_reg;
  66         u8 *fpga0_adr;
  67         unsigned long long small_flash_base, large_flash_base;
  68
  69         fpga0_adr = ioremap64(OCOTEA_FPGA_ADDR, 16);
  70         if (!fpga0_adr)
  71                 return -ENOMEM;
  72
  73         fpga0_reg = readb((unsigned long)fpga0_adr);
  74         iounmap(fpga0_adr);
  75
  76         if (OCOTEA_BOOT_LARGE_FLASH(fpga0_reg)) {
  77                 small_flash_base = OCOTEA_SMALL_FLASH_HIGH;
  78                 large_flash_base = OCOTEA_LARGE_FLASH_LOW;
  79         }
  80         else {
  81                 small_flash_base = OCOTEA_SMALL_FLASH_LOW;
  82                 large_flash_base = OCOTEA_LARGE_FLASH_HIGH;
  83         }
  84
  85         ocotea_small_map.phys = small_flash_base;
  86         ocotea_small_map.virt = ioremap64(small_flash_base,
  87                                          ocotea_small_map.size);
  88
  89         if (!ocotea_small_map.virt) {
  90                 printk("Failed to ioremap flash\n");
  91                 return -EIO;
  92         }
  93
  94         simple_map_init(&ocotea_small_map);
  95
  96         flash = do_map_probe("map_rom", &ocotea_small_map);
  97         if (flash) {
  98                 flash->owner = THIS_MODULE;
  99                 add_mtd_partitions(flash, ocotea_small_partitions,
 100                                         NB_OF(ocotea_small_partitions));
 101         } else {
 102                 printk("map probe failed for flash\n");
 103                 return -ENXIO;
 104         }
 105
 106         ocotea_large_map.phys = large_flash_base;
 107         ocotea_large_map.virt = ioremap64(large_flash_base,
 108                                          ocotea_large_map.size);
 109
 110         if (!ocotea_large_map.virt) {
 111                 printk("Failed to ioremap flash\n");
 112                 return -EIO;
 113         }
 114
 115         simple_map_init(&ocotea_large_map);
 116
 117         flash = do_map_probe("cfi_probe", &ocotea_large_map);
 118         if (flash) {
 119                 flash->owner = THIS_MODULE;
 120                 add_mtd_partitions(flash, ocotea_large_partitions,
 121                                         NB_OF(ocotea_large_partitions));
 122         } else {
 123                 printk("map probe failed for flash\n");
 124                 return -ENXIO;
 125         }
 126
 127         return 0;
 128 }
 129
 130 static void __exit cleanup_ocotea(void)
 131 {
 132         if (flash) {
 133                 del_mtd_partitions(flash);
 134                 map_destroy(flash);
 135         }
 136
 137         if (ocotea_small_map.virt) {
 138                 iounmap((void *)ocotea_small_map.virt);
 139                 ocotea_small_map.virt = 0;
 140         }
 141
 142         if (ocotea_large_map.virt) {
 143                 iounmap((void *)ocotea_large_map.virt);
 144                 ocotea_large_map.virt = 0;
 145         }
 146 }
 147
 148 module_init(init_ocotea);
 149 module_exit(cleanup_ocotea);
 150
 151 MODULE_LICENSE("GPL");
 152 MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
 153 MODULE_DESCRIPTION("MTD map and partitions for IBM 440GX Ocotea boards");