drivers/mtd/maps/ebony.c

   1 /*
   2  * Mapping for Ebony 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 <asm/io.h>
  22 #include <asm/ibm44x.h>
  23 #include <platforms/4xx/ebony.h>
  24
  25 static struct mtd_info *flash;
  26
  27 static struct map_info ebony_small_map = {
  28         .name =         "Ebony small flash",
  29         .size =         EBONY_SMALL_FLASH_SIZE,
  30         .bankwidth =    1,
  31 };
  32
  33 static struct map_info ebony_large_map = {
  34         .name =         "Ebony large flash",
  35         .size =         EBONY_LARGE_FLASH_SIZE,
  36         .bankwidth =    1,
  37 };
  38
  39 static struct mtd_partition ebony_small_partitions[] = {
  40         {
  41                 .name =   "OpenBIOS",
  42                 .offset = 0x0,
  43                 .size =   0x80000,
  44         }
  45 };
  46
  47 static struct mtd_partition ebony_large_partitions[] = {
  48         {
  49                 .name =   "fs",
  50                 .offset = 0,
  51                 .size =   0x380000,
  52         },
  53         {
  54                 .name =   "firmware",
  55                 .offset = 0x380000,
  56                 .size =   0x80000,
  57         }
  58 };
  59
  60 int __init init_ebony(void)
  61 {
  62         u8 fpga0_reg;
  63         u8 __iomem *fpga0_adr;
  64         unsigned long long small_flash_base, large_flash_base;
  65
  66         fpga0_adr = ioremap64(EBONY_FPGA_ADDR, 16);
  67         if (!fpga0_adr)
  68                 return -ENOMEM;
  69
  70         fpga0_reg = readb(fpga0_adr);
  71         iounmap(fpga0_adr);
  72
  73         if (EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  74                         !EBONY_FLASH_SEL(fpga0_reg))
  75                 small_flash_base = EBONY_SMALL_FLASH_HIGH2;
  76         else if (EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  77                         EBONY_FLASH_SEL(fpga0_reg))
  78                 small_flash_base = EBONY_SMALL_FLASH_HIGH1;
  79         else if (!EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  80                         !EBONY_FLASH_SEL(fpga0_reg))
  81                 small_flash_base = EBONY_SMALL_FLASH_LOW2;
  82         else
  83                 small_flash_base = EBONY_SMALL_FLASH_LOW1;
  84
  85         if (EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  86                         !EBONY_ONBRD_FLASH_EN(fpga0_reg))
  87                 large_flash_base = EBONY_LARGE_FLASH_LOW;
  88         else
  89                 large_flash_base = EBONY_LARGE_FLASH_HIGH;
  90
  91         ebony_small_map.phys = small_flash_base;
  92         ebony_small_map.virt = ioremap64(small_flash_base,
  93                                          ebony_small_map.size);
  94
  95         if (!ebony_small_map.virt) {
  96                 printk("Failed to ioremap flash\n");
  97                 return -EIO;
  98         }
  99
 100         simple_map_init(&ebony_small_map);
 101
 102         flash = do_map_probe("jedec_probe", &ebony_small_map);
 103         if (flash) {
 104                 flash->owner = THIS_MODULE;
 105                 add_mtd_partitions(flash, ebony_small_partitions,
 106                                         ARRAY_SIZE(ebony_small_partitions));
 107         } else {
 108                 printk("map probe failed for flash\n");
 109                 iounmap(ebony_small_map.virt);
 110                 return -ENXIO;
 111         }
 112
 113         ebony_large_map.phys = large_flash_base;
 114         ebony_large_map.virt = ioremap64(large_flash_base,
 115                                          ebony_large_map.size);
 116
 117         if (!ebony_large_map.virt) {
 118                 printk("Failed to ioremap flash\n");
 119                 iounmap(ebony_small_map.virt);
 120                 return -EIO;
 121         }
 122
 123         simple_map_init(&ebony_large_map);
 124
 125         flash = do_map_probe("jedec_probe", &ebony_large_map);
 126         if (flash) {
 127                 flash->owner = THIS_MODULE;
 128                 add_mtd_partitions(flash, ebony_large_partitions,
 129                                         ARRAY_SIZE(ebony_large_partitions));
 130         } else {
 131                 printk("map probe failed for flash\n");
 132                 iounmap(ebony_small_map.virt);
 133                 iounmap(ebony_large_map.virt);
 134                 return -ENXIO;
 135         }
 136
 137         return 0;
 138 }
 139
 140 static void __exit cleanup_ebony(void)
 141 {
 142         if (flash) {
 143                 del_mtd_partitions(flash);
 144                 map_destroy(flash);
 145         }
 146
 147         if (ebony_small_map.virt) {
 148                 iounmap(ebony_small_map.virt);
 149                 ebony_small_map.virt = NULL;
 150         }
 151
 152         if (ebony_large_map.virt) {
 153                 iounmap(ebony_large_map.virt);
 154                 ebony_large_map.virt = NULL;
 155         }
 156 }
 157
 158 module_init(init_ebony);
 159 module_exit(cleanup_ebony);
 160
 161 MODULE_LICENSE("GPL");
 162 MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
 163 MODULE_DESCRIPTION("MTD map and partitions for IBM 440GP Ebony boards");