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1// SPDX-License-Identifier: GPL-2.0-or-later2/* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board3 *4 * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com)5 * based on sc520cdp.c by Sysgo Real-Time Solutions GmbH6 *7 * The NetSc520 is a demonstration board for the Elan Sc520 processor available8 * from AMD. It has a single back of 16 megs of 32-bit Flash ROM and another9 * 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 virtual24** partitions. The first partition is 768 KiB and is intended to25** store the kernel image loaded by the bootstrap loader. The second26** partition is 256 KiB and holds the BIOS image. The third27** partition is 14.5 MiB and is intended for the flash file system28** image. The last partition is 512 KiB and contains another copy29** of the BIOS image and the reset vector.30**31** Only the third partition should be mounted. The first partition32** should not be mounted, but it can erased and written to using the33** MTD character routines. The second and fourth partitions should34** not be touched - it is possible to corrupt the BIOS image by35** mounting these partitions, and potentially the board will not be36** recoverable afterwards.37*/38 39/* partition_info gives details on the logical partitions that the split the40 * single flash device into. If the size if zero we use up to the end of the41 * device. */42static const struct mtd_partition partition_info[] = {43 {44 .name = "NetSc520 boot kernel",45 .offset = 0,46 .size = 0xc000047 },48 {49 .name = "NetSc520 Low BIOS",50 .offset = 0xc0000,51 .size = 0x4000052 },53 {54 .name = "NetSc520 file system",55 .offset = 0x100000,56 .size = 0xe8000057 },58 {59 .name = "NetSc520 High BIOS",60 .offset = 0xf80000,61 .size = 0x8000062 },63};64#define NUM_PARTITIONS ARRAY_SIZE(partition_info)65 66#define WINDOW_SIZE 0x0010000067#define WINDOW_ADDR 0x0020000068 69static 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 78static struct mtd_info *mymtd;79 80static 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(netsc520_map.phys, netsc520_map.size);86 87 if (!netsc520_map.virt) {88 printk("Failed to ioremap\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 110static 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 122module_init(init_netsc520);123module_exit(cleanup_netsc520);124 125MODULE_LICENSE("GPL");126MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");127MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");128