release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/mtd/maps/dmv182.c

   1
   2 /*
   3  * drivers/mtd/maps/dmv182.c
   4  *
   5  * Flash map driver for the Dy4 SVME182 board
   6  *
   7  * Copyright 2003-2004, TimeSys Corporation
   8  *
   9  * Based on the SVME181 flash map, by Tom Nelson, Dot4, Inc. for TimeSys Corp.
  10  *
  11  * This program is free software; you can redistribute  it and/or modify it
  12  * under  the terms of  the GNU General  Public License as published by the
  13  * Free Software Foundation;  either version 2 of the  License, or (at your
  14  * option) any later version.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/types.h>
  20 #include <linux/kernel.h>
  21 #include <asm/io.h>
  22 #include <linux/mtd/mtd.h>
  23 #include <linux/mtd/map.h>
  24 #include <linux/mtd/partitions.h>
  25 #include <linux/errno.h>
  26
  27 /*
  28  * This driver currently handles only the 16MiB user flash bank 1 on the
  29  * board.  It does not provide access to bank 0 (contains the Dy4 FFW), bank 2
  30  * (VxWorks boot), or the optional 48MiB expansion flash.
  31  *
  32  * scott.wood@timesys.com: On the newer boards with 128MiB flash, it
  33  * now supports the first 96MiB (the boot flash bank containing FFW
  34  * is excluded).  The VxWorks loader is in partition 1.
  35  */
  36
  37 #define FLASH_BASE_ADDR 0xf0000000
  38 #define FLASH_BANK_SIZE (128*1024*1024)
  39
  40 MODULE_AUTHOR("Scott Wood, TimeSys Corporation <scott.wood@timesys.com>");
  41 MODULE_DESCRIPTION("User-programmable flash device on the Dy4 SVME182 board");
  42 MODULE_LICENSE("GPL");
  43
  44 static struct map_info svme182_map = {
  45         .name           = "Dy4 SVME182",
  46         .bankwidth      = 32,
  47         .size           =  128 * 1024 * 1024
  48 };
  49
  50 #define BOOTIMAGE_PART_SIZE             ((6*1024*1024)-RESERVED_PART_SIZE)
  51
  52 // Allow 6MiB for the kernel
  53 #define NEW_BOOTIMAGE_PART_SIZE  (6 * 1024 * 1024)
  54 // Allow 1MiB for the bootloader
  55 #define NEW_BOOTLOADER_PART_SIZE (1024 * 1024)
  56 // Use the remaining 9MiB at the end of flash for the RFS
  57 #define NEW_RFS_PART_SIZE        (0x01000000 - NEW_BOOTLOADER_PART_SIZE - \
  58                                   NEW_BOOTIMAGE_PART_SIZE)
  59
  60 static struct mtd_partition svme182_partitions[] = {
  61         // The Lower PABS is only 128KiB, but the partition code doesn't
  62         // like partitions that don't end on the largest erase block
  63         // size of the device, even if all of the erase blocks in the
  64         // partition are small ones.  The hardware should prevent
  65         // writes to the actual PABS areas.
  66         {
  67                 name:       "Lower PABS and CPU 0 bootloader or kernel",
  68                 size:       6*1024*1024,
  69                 offset:     0,
  70         },
  71         {
  72                 name:       "Root Filesystem",
  73                 size:       10*1024*1024,
  74                 offset:     MTDPART_OFS_NXTBLK
  75         },
  76         {
  77                 name:       "CPU1 Bootloader",
  78                 size:       1024*1024,
  79                 offset:     MTDPART_OFS_NXTBLK,
  80         },
  81         {
  82                 name:       "Extra",
  83                 size:       110*1024*1024,
  84                 offset:     MTDPART_OFS_NXTBLK
  85         },
  86         {
  87                 name:       "Foundation Firmware and Upper PABS",
  88                 size:       1024*1024,
  89                 offset:     MTDPART_OFS_NXTBLK,
  90                 mask_flags: MTD_WRITEABLE // read-only
  91         }
  92 };
  93
  94 static struct mtd_info *this_mtd;
  95
  96 static int __init init_svme182(void)
  97 {
  98         struct mtd_partition *partitions;
  99         int num_parts = ARRAY_SIZE(svme182_partitions);
 100
 101         partitions = svme182_partitions;
 102
 103         svme182_map.virt = ioremap(FLASH_BASE_ADDR, svme182_map.size);
 104
 105         if (svme182_map.virt == 0) {
 106                 printk("Failed to ioremap FLASH memory area.\n");
 107                 return -EIO;
 108         }
 109
 110         simple_map_init(&svme182_map);
 111
 112         this_mtd = do_map_probe("cfi_probe", &svme182_map);
 113         if (!this_mtd)
 114         {
 115                 iounmap((void *)svme182_map.virt);
 116                 return -ENXIO;
 117         }
 118
 119         printk(KERN_NOTICE "SVME182 flash device: %dMiB at 0x%08x\n",
 120                    this_mtd->size >> 20, FLASH_BASE_ADDR);
 121
 122         this_mtd->owner = THIS_MODULE;
 123         add_mtd_partitions(this_mtd, partitions, num_parts);
 124
 125         return 0;
 126 }
 127
 128 static void __exit cleanup_svme182(void)
 129 {
 130         if (this_mtd)
 131         {
 132                 del_mtd_partitions(this_mtd);
 133                 map_destroy(this_mtd);
 134         }
 135
 136         if (svme182_map.virt)
 137         {
 138                 iounmap((void *)svme182_map.virt);
 139                 svme182_map.virt = 0;
 140         }
 141
 142         return;
 143 }
 144
 145 module_init(init_svme182);
 146 module_exit(cleanup_svme182);