drivers/mtd/maps/ebony.c

   1 /*
   2  * $Id: ebony.c,v 1.8 2003/06/23 11:48:18 dwmw2 Exp $
   3  *
   4  * Mapping for Ebony user flash
   5  *
   6  * Matt Porter <mporter@mvista.com>
   7  *
   8  * Copyright 2002 MontaVista Software Inc.
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/mtd/mtd.h>
  21 #include <linux/mtd/map.h>
  22 #include <linux/mtd/partitions.h>
  23 #include <linux/config.h>
  24 #include <asm/io.h>
  25 #include <asm/ibm440.h>
  26 #include <platforms/ebony.h>
  27
  28 static struct mtd_info *flash;
  29
  30 static struct map_info ebony_small_map = {
  31         .name =         "Ebony small flash",
  32         .size =         EBONY_SMALL_FLASH_SIZE,
  33         .buswidth =     1,
  34 };
  35
  36 static struct map_info ebony_large_map = {
  37         .name =         "Ebony large flash",
  38         .size =         EBONY_LARGE_FLASH_SIZE,
  39         .buswidth =     1,
  40 };
  41
  42 static struct mtd_partition ebony_small_partitions[] = {
  43         {
  44                 .name =   "OpenBIOS",
  45                 .offset = 0x0,
  46                 .size =   0x80000,
  47         }
  48 };
  49
  50 static struct mtd_partition ebony_large_partitions[] = {
  51         {
  52                 .name =   "fs",
  53                 .offset = 0,
  54                 .size =   0x380000,
  55         },
  56         {
  57                 .name =   "firmware",
  58                 .offset = 0x380000,
  59                 .size =   0x80000,
  60         }
  61 };
  62
  63 int __init init_ebony(void)
  64 {
  65         u8 fpga0_reg;
  66         unsigned long fpga0_adr;
  67         unsigned long long small_flash_base, large_flash_base;
  68
  69         fpga0_adr = ioremap64(EBONY_FPGA_ADDR, 16);
  70         if (!fpga0_adr)
  71                 return -ENOMEM;
  72
  73         fpga0_reg = readb(fpga0_adr);
  74         iounmap64(fpga0_adr);
  75
  76         if (EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  77                         !EBONY_FLASH_SEL(fpga0_reg))
  78                 small_flash_base = EBONY_SMALL_FLASH_HIGH2;
  79         else if (EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  80                         EBONY_FLASH_SEL(fpga0_reg))
  81                 small_flash_base = EBONY_SMALL_FLASH_HIGH1;
  82         else if (!EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  83                         !EBONY_FLASH_SEL(fpga0_reg))
  84                 small_flash_base = EBONY_SMALL_FLASH_LOW2;
  85         else
  86                 small_flash_base = EBONY_SMALL_FLASH_LOW1;
  87
  88         if (EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  89                         !EBONY_ONBRD_FLASH_EN(fpga0_reg))
  90                 large_flash_base = EBONY_LARGE_FLASH_LOW;
  91         else
  92                 large_flash_base = EBONY_LARGE_FLASH_HIGH;
  93
  94         ebony_small_map.phys = small_flash_base;
  95         ebony_small_map.virt =
  96                 (unsigned long)ioremap64(small_flash_base,
  97                                          ebony_small_map.size);
  98
  99         if (!ebony_small_map.virt) {
 100                 printk("Failed to ioremap flash\n");
 101                 return -EIO;
 102         }
 103
 104         simple_map_init(&ebony_small_map);
 105
 106         flash = do_map_probe("map_rom", &ebony_small_map);
 107         if (flash) {
 108                 flash->owner = THIS_MODULE;
 109                 add_mtd_partitions(flash, ebony_small_partitions,
 110                                         ARRAY_SIZE(ebony_small_partitions));
 111         } else {
 112                 printk("map probe failed for flash\n");
 113                 return -ENXIO;
 114         }
 115
 116         ebony_large_map.phys = large_flash_base;
 117         ebony_large_map.virt =
 118                 (unsigned long)ioremap64(large_flash_base,
 119                                          ebony_large_map.size);
 120
 121         if (!ebony_large_map.virt) {
 122                 printk("Failed to ioremap flash\n");
 123                 return -EIO;
 124         }
 125
 126         simple_map_init(&ebony_large_map);
 127
 128         flash = do_map_probe("cfi_probe", &ebony_large_map);
 129         if (flash) {
 130                 flash->owner = THIS_MODULE;
 131                 add_mtd_partitions(flash, ebony_large_partitions,
 132                                         ARRAY_SIZE(ebony_large_partitions));
 133         } else {
 134                 printk("map probe failed for flash\n");
 135                 return -ENXIO;
 136         }
 137
 138         return 0;
 139 }
 140
 141 static void __exit cleanup_ebony(void)
 142 {
 143         if (flash) {
 144                 del_mtd_partitions(flash);
 145                 map_destroy(flash);
 146         }
 147
 148         if (ebony_small_map.virt) {
 149                 iounmap((void *)ebony_small_map.virt);
 150                 ebony_small_map.virt = 0;
 151         }
 152
 153         if (ebony_large_map.virt) {
 154                 iounmap((void *)ebony_large_map.virt);
 155                 ebony_large_map.virt = 0;
 156         }
 157 }
 158
 159 module_init(init_ebony);
 160 module_exit(cleanup_ebony);
 161
 162 MODULE_LICENSE("GPL");
 163 MODULE_AUTHOR("Matt Porter <mporter@mvista.com>");
 164 MODULE_DESCRIPTION("MTD map and partitions for IBM 440GP Ebony boards");