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  * $Id: dmv182.c,v 1.6 2005/11/07 11:14:26 gleixner Exp $
   8  *
   9  * Copyright 2003-2004, TimeSys Corporation
  10  *
  11  * Based on the SVME181 flash map, by Tom Nelson, Dot4, Inc. for TimeSys Corp.
  12  *
  13  * This program is free software; you can redistribute  it and/or modify it
  14  * under  the terms of  the GNU General  Public License as published by the
  15  * Free Software Foundation;  either version 2 of the  License, or (at your
  16  * option) any later version.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/types.h>
  22 #include <linux/kernel.h>
  23 #include <asm/io.h>
  24 #include <linux/mtd/mtd.h>
  25 #include <linux/mtd/map.h>
  26 #include <linux/mtd/partitions.h>
  27 #include <linux/errno.h>
  28
  29 /*
  30  * This driver currently handles only the 16MiB user flash bank 1 on the
  31  * board.  It does not provide access to bank 0 (contains the Dy4 FFW), bank 2
  32  * (VxWorks boot), or the optional 48MiB expansion flash.
  33  *
  34  * scott.wood@timesys.com: On the newer boards with 128MiB flash, it
  35  * now supports the first 96MiB (the boot flash bank containing FFW
  36  * is excluded).  The VxWorks loader is in partition 1.
  37  */
  38
  39 #define FLASH_BASE_ADDR 0xf0000000
  40 #define FLASH_BANK_SIZE (128*1024*1024)
  41
  42 MODULE_AUTHOR("Scott Wood, TimeSys Corporation <scott.wood@timesys.com>");
  43 MODULE_DESCRIPTION("User-programmable flash device on the Dy4 SVME182 board");
  44 MODULE_LICENSE("GPL");
  45
  46 static struct map_info svme182_map = {
  47         .name           = "Dy4 SVME182",
  48         .bankwidth      = 32,
  49         .size           =  128 * 1024 * 1024
  50 };
  51
  52 #define BOOTIMAGE_PART_SIZE             ((6*1024*1024)-RESERVED_PART_SIZE)
  53
  54 // Allow 6MiB for the kernel
  55 #define NEW_BOOTIMAGE_PART_SIZE  (6 * 1024 * 1024)
  56 // Allow 1MiB for the bootloader
  57 #define NEW_BOOTLOADER_PART_SIZE (1024 * 1024)
  58 // Use the remaining 9MiB at the end of flash for the RFS
  59 #define NEW_RFS_PART_SIZE        (0x01000000 - NEW_BOOTLOADER_PART_SIZE - \
  60                                   NEW_BOOTIMAGE_PART_SIZE)
  61
  62 static struct mtd_partition svme182_partitions[] = {
  63         // The Lower PABS is only 128KiB, but the partition code doesn't
  64         // like partitions that don't end on the largest erase block
  65         // size of the device, even if all of the erase blocks in the
  66         // partition are small ones.  The hardware should prevent
  67         // writes to the actual PABS areas.
  68         {
  69                 name:       "Lower PABS and CPU 0 bootloader or kernel",
  70                 size:       6*1024*1024,
  71                 offset:     0,
  72         },
  73         {
  74                 name:       "Root Filesystem",
  75                 size:       10*1024*1024,
  76                 offset:     MTDPART_OFS_NXTBLK
  77         },
  78         {
  79                 name:       "CPU1 Bootloader",
  80                 size:       1024*1024,
  81                 offset:     MTDPART_OFS_NXTBLK,
  82         },
  83         {
  84                 name:       "Extra",
  85                 size:       110*1024*1024,
  86                 offset:     MTDPART_OFS_NXTBLK
  87         },
  88         {
  89                 name:       "Foundation Firmware and Upper PABS",
  90                 size:       1024*1024,
  91                 offset:     MTDPART_OFS_NXTBLK,
  92                 mask_flags: MTD_WRITEABLE // read-only
  93         }
  94 };
  95
  96 static struct mtd_info *this_mtd;
  97
  98 static int __init init_svme182(void)
  99 {
 100         struct mtd_partition *partitions;
 101         int num_parts = ARRAY_SIZE(svme182_partitions);
 102
 103         partitions = svme182_partitions;
 104
 105         svme182_map.virt = ioremap(FLASH_BASE_ADDR, svme182_map.size);
 106
 107         if (svme182_map.virt == 0) {
 108                 printk("Failed to ioremap FLASH memory area.\n");
 109                 return -EIO;
 110         }
 111
 112         simple_map_init(&svme182_map);
 113
 114         this_mtd = do_map_probe("cfi_probe", &svme182_map);
 115         if (!this_mtd)
 116         {
 117                 iounmap((void *)svme182_map.virt);
 118                 return -ENXIO;
 119         }
 120
 121         printk(KERN_NOTICE "SVME182 flash device: %dMiB at 0x%08x\n",
 122                    this_mtd->size >> 20, FLASH_BASE_ADDR);
 123
 124         this_mtd->owner = THIS_MODULE;
 125         add_mtd_partitions(this_mtd, partitions, num_parts);
 126
 127         return 0;
 128 }
 129
 130 static void __exit cleanup_svme182(void)
 131 {
 132         if (this_mtd)
 133         {
 134                 del_mtd_partitions(this_mtd);
 135                 map_destroy(this_mtd);
 136         }
 137
 138         if (svme182_map.virt)
 139         {
 140                 iounmap((void *)svme182_map.virt);
 141                 svme182_map.virt = 0;
 142         }
 143
 144         return;
 145 }
 146
 147 module_init(init_svme182);
 148 module_exit(cleanup_svme182);