1/* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board 2 * 3 * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com) 4 * based on sc520cdp.c by Sysgo Real-Time Solutions GmbH 5 * 6 * $Id: netsc520.c,v 1.1.1.1 2007/08/03 18:52:44 Exp $ 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 21 * 22 * The NetSc520 is a demonstration board for the Elan Sc520 processor available 23 * from AMD. It has a single back of 16 megs of 32-bit Flash ROM and another 24 * 16 megs of SDRAM. 25 */ 26 27#include <linux/module.h> 28#include <linux/types.h> 29#include <linux/kernel.h> 30#include <linux/init.h> 31#include <asm/io.h> 32#include <linux/mtd/mtd.h> 33#include <linux/mtd/map.h> 34#include <linux/mtd/partitions.h> 35 36 37/* 38** The single, 16 megabyte flash bank is divided into four virtual 39** partitions. The first partition is 768 KiB and is intended to 40** store the kernel image loaded by the bootstrap loader. The second 41** partition is 256 KiB and holds the BIOS image. The third 42** partition is 14.5 MiB and is intended for the flash file system 43** image. The last partition is 512 KiB and contains another copy 44** of the BIOS image and the reset vector. 45** 46** Only the third partition should be mounted. The first partition 47** should not be mounted, but it can erased and written to using the 48** MTD character routines. The second and fourth partitions should 49** not be touched - it is possible to corrupt the BIOS image by 50** mounting these partitions, and potentially the board will not be 51** recoverable afterwards. 52*/ 53 54/* partition_info gives details on the logical partitions that the split the 55 * single flash device into. If the size if zero we use up to the end of the 56 * device. */ 57static struct mtd_partition partition_info[]={ 58 { 59 .name = "NetSc520 boot kernel", 60 .offset = 0, 61 .size = 0xc0000 62 }, 63 { 64 .name = "NetSc520 Low BIOS", 65 .offset = 0xc0000, 66 .size = 0x40000 67 }, 68 { 69 .name = "NetSc520 file system", 70 .offset = 0x100000, 71 .size = 0xe80000 72 }, 73 { 74 .name = "NetSc520 High BIOS", 75 .offset = 0xf80000, 76 .size = 0x80000 77 }, 78}; 79#define NUM_PARTITIONS ARRAY_SIZE(partition_info) 80 81#define WINDOW_SIZE 0x00100000 82#define WINDOW_ADDR 0x00200000 83 84static struct map_info netsc520_map = { 85 .name = "netsc520 Flash Bank", 86 .size = WINDOW_SIZE, 87 .bankwidth = 4, 88 .phys = WINDOW_ADDR, 89}; 90 91#define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map) 92 93static struct mtd_info *mymtd; 94 95static int __init init_netsc520(void) 96{ 97 printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n", 98 (unsigned long long)netsc520_map.size, 99 (unsigned long long)netsc520_map.phys); 100 netsc520_map.virt = ioremap_nocache(netsc520_map.phys, netsc520_map.size); 101 102 if (!netsc520_map.virt) { 103 printk("Failed to ioremap_nocache\n"); 104 return -EIO; 105 } 106 107 simple_map_init(&netsc520_map); 108 109 mymtd = do_map_probe("cfi_probe", &netsc520_map); 110 if(!mymtd) 111 mymtd = do_map_probe("map_ram", &netsc520_map); 112 if(!mymtd) 113 mymtd = do_map_probe("map_rom", &netsc520_map); 114 115 if (!mymtd) { 116 iounmap(netsc520_map.virt); 117 return -ENXIO; 118 } 119 120 mymtd->owner = THIS_MODULE; 121 add_mtd_partitions( mymtd, partition_info, NUM_PARTITIONS ); 122 return 0; 123} 124 125static void __exit cleanup_netsc520(void) 126{ 127 if (mymtd) { 128 del_mtd_partitions(mymtd); 129 map_destroy(mymtd); 130 } 131 if (netsc520_map.virt) { 132 iounmap(netsc520_map.virt); 133 netsc520_map.virt = NULL; 134 } 135} 136 137module_init(init_netsc520); 138module_exit(cleanup_netsc520); 139 140MODULE_LICENSE("GPL"); 141MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>"); 142MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board"); 143