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