128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board
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*
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* Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com)
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* based on sc520cdp.c by Sysgo Real-Time Solutions GmbH
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*
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* The NetSc520 is a demonstration board for the Elan Sc520 processor available
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* from AMD. It has a single back of 16 megs of 32-bit Flash ROM and another
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* 16 megs of SDRAM.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/io.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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/*
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** The single, 16 megabyte flash bank is divided into four virtual
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** partitions. The first partition is 768 KiB and is intended to
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** store the kernel image loaded by the bootstrap loader. The second
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** partition is 256 KiB and holds the BIOS image. The third
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** partition is 14.5 MiB and is intended for the flash file system
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** image. The last partition is 512 KiB and contains another copy
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** of the BIOS image and the reset vector.
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**
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** Only the third partition should be mounted. The first partition
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** should not be mounted, but it can erased and written to using the
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** MTD character routines. The second and fourth partitions should
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** not be touched - it is possible to corrupt the BIOS image by
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** mounting these partitions, and potentially the board will not be
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** recoverable afterwards.
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*/
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/* partition_info gives details on the logical partitions that the split the
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* single flash device into. If the size if zero we use up to the end of the
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* device. */
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static const struct mtd_partition partition_info[] = {
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{
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.name = "NetSc520 boot kernel",
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.offset = 0,
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.size = 0xc0000
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},
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{
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.name = "NetSc520 Low BIOS",
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.offset = 0xc0000,
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.size = 0x40000
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},
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{
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.name = "NetSc520 file system",
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.offset = 0x100000,
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.size = 0xe80000
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},
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{
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.name = "NetSc520 High BIOS",
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.offset = 0xf80000,
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.size = 0x80000
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},
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};
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#define NUM_PARTITIONS ARRAY_SIZE(partition_info)
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#define WINDOW_SIZE 0x00100000
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#define WINDOW_ADDR 0x00200000
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static struct map_info netsc520_map = {
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.name = "netsc520 Flash Bank",
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.size = WINDOW_SIZE,
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.bankwidth = 4,
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.phys = WINDOW_ADDR,
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};
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#define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map)
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static struct mtd_info *mymtd;
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static int __init init_netsc520(void)
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{
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printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n",
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(unsigned long long)netsc520_map.size,
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(unsigned long long)netsc520_map.phys);
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netsc520_map.virt = ioremap(netsc520_map.phys, netsc520_map.size);
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if (!netsc520_map.virt) {
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printk("Failed to ioremap\n");
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return -EIO;
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}
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simple_map_init(&netsc520_map);
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mymtd = do_map_probe("cfi_probe", &netsc520_map);
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if(!mymtd)
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mymtd = do_map_probe("map_ram", &netsc520_map);
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if(!mymtd)
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mymtd = do_map_probe("map_rom", &netsc520_map);
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if (!mymtd) {
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iounmap(netsc520_map.virt);
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return -ENXIO;
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}
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mymtd->owner = THIS_MODULE;
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mtd_device_register(mymtd, partition_info, NUM_PARTITIONS);
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return 0;
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}
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static void __exit cleanup_netsc520(void)
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{
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if (mymtd) {
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mtd_device_unregister(mymtd);
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map_destroy(mymtd);
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}
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if (netsc520_map.virt) {
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iounmap(netsc520_map.virt);
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netsc520_map.virt = NULL;
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}
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}
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module_init(init_netsc520);
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module_exit(cleanup_netsc520);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");
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MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");
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