1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board 3 * 4 * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com) 5 * based on sc520cdp.c by Sysgo Real-Time Solutions GmbH 6 * 7 * The NetSc520 is a demonstration board for the Elan Sc520 processor available 8 * from AMD. It has a single back of 16 megs of 32-bit Flash ROM and another 9 * 16 megs of SDRAM. 10 */ 11 12 #include <linux/module.h> 13 #include <linux/types.h> 14 #include <linux/kernel.h> 15 #include <linux/init.h> 16 #include <asm/io.h> 17 #include <linux/mtd/mtd.h> 18 #include <linux/mtd/map.h> 19 #include <linux/mtd/partitions.h> 20 21 22 /* 23 ** The single, 16 megabyte flash bank is divided into four virtual 24 ** partitions. The first partition is 768 KiB and is intended to 25 ** store the kernel image loaded by the bootstrap loader. The second 26 ** partition is 256 KiB and holds the BIOS image. The third 27 ** partition is 14.5 MiB and is intended for the flash file system 28 ** image. The last partition is 512 KiB and contains another copy 29 ** of the BIOS image and the reset vector. 30 ** 31 ** Only the third partition should be mounted. The first partition 32 ** should not be mounted, but it can erased and written to using the 33 ** MTD character routines. The second and fourth partitions should 34 ** not be touched - it is possible to corrupt the BIOS image by 35 ** mounting these partitions, and potentially the board will not be 36 ** recoverable afterwards. 37 */ 38 39 /* partition_info gives details on the logical partitions that the split the 40 * single flash device into. If the size if zero we use up to the end of the 41 * device. */ 42 static const struct mtd_partition partition_info[] = { 43 { 44 .name = "NetSc520 boot kernel", 45 .offset = 0, 46 .size = 0xc0000 47 }, 48 { 49 .name = "NetSc520 Low BIOS", 50 .offset = 0xc0000, 51 .size = 0x40000 52 }, 53 { 54 .name = "NetSc520 file system", 55 .offset = 0x100000, 56 .size = 0xe80000 57 }, 58 { 59 .name = "NetSc520 High BIOS", 60 .offset = 0xf80000, 61 .size = 0x80000 62 }, 63 }; 64 #define NUM_PARTITIONS ARRAY_SIZE(partition_info) 65 66 #define WINDOW_SIZE 0x00100000 67 #define WINDOW_ADDR 0x00200000 68 69 static struct map_info netsc520_map = { 70 .name = "netsc520 Flash Bank", 71 .size = WINDOW_SIZE, 72 .bankwidth = 4, 73 .phys = WINDOW_ADDR, 74 }; 75 76 #define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map) 77 78 static struct mtd_info *mymtd; 79 80 static int __init init_netsc520(void) 81 { 82 printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n", 83 (unsigned long long)netsc520_map.size, 84 (unsigned long long)netsc520_map.phys); 85 netsc520_map.virt = ioremap_nocache(netsc520_map.phys, netsc520_map.size); 86 87 if (!netsc520_map.virt) { 88 printk("Failed to ioremap_nocache\n"); 89 return -EIO; 90 } 91 92 simple_map_init(&netsc520_map); 93 94 mymtd = do_map_probe("cfi_probe", &netsc520_map); 95 if(!mymtd) 96 mymtd = do_map_probe("map_ram", &netsc520_map); 97 if(!mymtd) 98 mymtd = do_map_probe("map_rom", &netsc520_map); 99 100 if (!mymtd) { 101 iounmap(netsc520_map.virt); 102 return -ENXIO; 103 } 104 105 mymtd->owner = THIS_MODULE; 106 mtd_device_register(mymtd, partition_info, NUM_PARTITIONS); 107 return 0; 108 } 109 110 static void __exit cleanup_netsc520(void) 111 { 112 if (mymtd) { 113 mtd_device_unregister(mymtd); 114 map_destroy(mymtd); 115 } 116 if (netsc520_map.virt) { 117 iounmap(netsc520_map.virt); 118 netsc520_map.virt = NULL; 119 } 120 } 121 122 module_init(init_netsc520); 123 module_exit(cleanup_netsc520); 124 125 MODULE_LICENSE("GPL"); 126 MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>"); 127 MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board"); 128