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