drivers/mtd/maps/ebony.c

   1 /*
   2  * $Id: ebony.c,v 1.16 2005/11/07 11:14:26 gleixner Exp $
   3  *
   4  * Mapping for Ebony user flash
   5  *
   6  * Matt Porter <mporter@kernel.crashing.org>
   7  *
   8  * Copyright 2002-2004 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/ibm44x.h>
  26 #include <platforms/4xx/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         .bankwidth =    1,
  34 };
  35
  36 static struct map_info ebony_large_map = {
  37         .name =         "Ebony large flash",
  38         .size =         EBONY_LARGE_FLASH_SIZE,
  39         .bankwidth =    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         u8 __iomem *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         iounmap(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 = ioremap64(small_flash_base,
  96                                          ebony_small_map.size);
  97
  98         if (!ebony_small_map.virt) {
  99                 printk("Failed to ioremap flash\n");
 100                 return -EIO;
 101         }
 102
 103         simple_map_init(&ebony_small_map);
 104
 105         flash = do_map_probe("jedec_probe", &ebony_small_map);
 106         if (flash) {
 107                 flash->owner = THIS_MODULE;
 108                 add_mtd_partitions(flash, ebony_small_partitions,
 109                                         ARRAY_SIZE(ebony_small_partitions));
 110         } else {
 111                 printk("map probe failed for flash\n");
 112                 return -ENXIO;
 113         }
 114
 115         ebony_large_map.phys = large_flash_base;
 116         ebony_large_map.virt = ioremap64(large_flash_base,
 117                                          ebony_large_map.size);
 118
 119         if (!ebony_large_map.virt) {
 120                 printk("Failed to ioremap flash\n");
 121                 return -EIO;
 122         }
 123
 124         simple_map_init(&ebony_large_map);
 125
 126         flash = do_map_probe("jedec_probe", &ebony_large_map);
 127         if (flash) {
 128                 flash->owner = THIS_MODULE;
 129                 add_mtd_partitions(flash, ebony_large_partitions,
 130                                         ARRAY_SIZE(ebony_large_partitions));
 131         } else {
 132                 printk("map probe failed for flash\n");
 133                 return -ENXIO;
 134         }
 135
 136         return 0;
 137 }
 138
 139 static void __exit cleanup_ebony(void)
 140 {
 141         if (flash) {
 142                 del_mtd_partitions(flash);
 143                 map_destroy(flash);
 144         }
 145
 146         if (ebony_small_map.virt) {
 147                 iounmap(ebony_small_map.virt);
 148                 ebony_small_map.virt = NULL;
 149         }
 150
 151         if (ebony_large_map.virt) {
 152                 iounmap(ebony_large_map.virt);
 153                 ebony_large_map.virt = NULL;
 154         }
 155 }
 156
 157 module_init(init_ebony);
 158 module_exit(cleanup_ebony);
 159
 160 MODULE_LICENSE("GPL");
 161 MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
 162 MODULE_DESCRIPTION("MTD map and partitions for IBM 440GP Ebony boards");