drivers/mtd/maps/ebony.c

   1 /*
   2  * $Id: ebony.c,v 1.15 2004/12/09 18:39:54 holindho 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 <linux/version.h>
  25 #include <asm/io.h>
  26 #include <asm/ibm44x.h>
  27 #include <platforms/4xx/ebony.h>
  28
  29 static struct mtd_info *flash;
  30
  31 static struct map_info ebony_small_map = {
  32         .name =         "Ebony small flash",
  33         .size =         EBONY_SMALL_FLASH_SIZE,
  34         .bankwidth =    1,
  35 };
  36
  37 static struct map_info ebony_large_map = {
  38         .name =         "Ebony large flash",
  39         .size =         EBONY_LARGE_FLASH_SIZE,
  40         .bankwidth =    1,
  41 };
  42
  43 static struct mtd_partition ebony_small_partitions[] = {
  44         {
  45                 .name =   "OpenBIOS",
  46                 .offset = 0x0,
  47                 .size =   0x80000,
  48         }
  49 };
  50
  51 static struct mtd_partition ebony_large_partitions[] = {
  52         {
  53                 .name =   "fs",
  54                 .offset = 0,
  55                 .size =   0x380000,
  56         },
  57         {
  58                 .name =   "firmware",
  59                 .offset = 0x380000,
  60                 .size =   0x80000,
  61         }
  62 };
  63
  64 int __init init_ebony(void)
  65 {
  66         u8 fpga0_reg;
  67         u8 __iomem *fpga0_adr;
  68         unsigned long long small_flash_base, large_flash_base;
  69
  70         fpga0_adr = ioremap64(EBONY_FPGA_ADDR, 16);
  71         if (!fpga0_adr)
  72                 return -ENOMEM;
  73
  74         fpga0_reg = readb(fpga0_adr);
  75         iounmap(fpga0_adr);
  76
  77         if (EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  78                         !EBONY_FLASH_SEL(fpga0_reg))
  79                 small_flash_base = EBONY_SMALL_FLASH_HIGH2;
  80         else if (EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  81                         EBONY_FLASH_SEL(fpga0_reg))
  82                 small_flash_base = EBONY_SMALL_FLASH_HIGH1;
  83         else if (!EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  84                         !EBONY_FLASH_SEL(fpga0_reg))
  85                 small_flash_base = EBONY_SMALL_FLASH_LOW2;
  86         else
  87                 small_flash_base = EBONY_SMALL_FLASH_LOW1;
  88
  89         if (EBONY_BOOT_SMALL_FLASH(fpga0_reg) &&
  90                         !EBONY_ONBRD_FLASH_EN(fpga0_reg))
  91                 large_flash_base = EBONY_LARGE_FLASH_LOW;
  92         else
  93                 large_flash_base = EBONY_LARGE_FLASH_HIGH;
  94
  95         ebony_small_map.phys = small_flash_base;
  96         ebony_small_map.virt = 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("jedec_probe", &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 = ioremap64(large_flash_base,
 118                                          ebony_large_map.size);
 119
 120         if (!ebony_large_map.virt) {
 121                 printk("Failed to ioremap flash\n");
 122                 return -EIO;
 123         }
 124
 125         simple_map_init(&ebony_large_map);
 126
 127         flash = do_map_probe("jedec_probe", &ebony_large_map);
 128         if (flash) {
 129                 flash->owner = THIS_MODULE;
 130                 add_mtd_partitions(flash, ebony_large_partitions,
 131                                         ARRAY_SIZE(ebony_large_partitions));
 132         } else {
 133                 printk("map probe failed for flash\n");
 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");