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Diffstat (limited to 'kernel/drivers/mtd/maps/netsc520.c')
| -rw-r--r-- | kernel/drivers/mtd/maps/netsc520.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/kernel/drivers/mtd/maps/netsc520.c b/kernel/drivers/mtd/maps/netsc520.c new file mode 100644 index 000000000..81dc2598b --- /dev/null +++ b/kernel/drivers/mtd/maps/netsc520.c @@ -0,0 +1,140 @@ +/* netsc520.c -- MTD map driver for AMD NetSc520 Demonstration Board + * + * Copyright (C) 2001 Mark Langsdorf (mark.langsdorf@amd.com) + * based on sc520cdp.c by Sysgo Real-Time Solutions GmbH + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + * + * The NetSc520 is a demonstration board for the Elan Sc520 processor available + * from AMD. It has a single back of 16 megs of 32-bit Flash ROM and another + * 16 megs of SDRAM. + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <asm/io.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/map.h> +#include <linux/mtd/partitions.h> + + +/* +** The single, 16 megabyte flash bank is divided into four virtual +** partitions. The first partition is 768 KiB and is intended to +** store the kernel image loaded by the bootstrap loader. The second +** partition is 256 KiB and holds the BIOS image. The third +** partition is 14.5 MiB and is intended for the flash file system +** image. The last partition is 512 KiB and contains another copy +** of the BIOS image and the reset vector. +** +** Only the third partition should be mounted. The first partition +** should not be mounted, but it can erased and written to using the +** MTD character routines. The second and fourth partitions should +** not be touched - it is possible to corrupt the BIOS image by +** mounting these partitions, and potentially the board will not be +** recoverable afterwards. +*/ + +/* partition_info gives details on the logical partitions that the split the + * single flash device into. If the size if zero we use up to the end of the + * device. */ +static struct mtd_partition partition_info[]={ + { + .name = "NetSc520 boot kernel", + .offset = 0, + .size = 0xc0000 + }, + { + .name = "NetSc520 Low BIOS", + .offset = 0xc0000, + .size = 0x40000 + }, + { + .name = "NetSc520 file system", + .offset = 0x100000, + .size = 0xe80000 + }, + { + .name = "NetSc520 High BIOS", + .offset = 0xf80000, + .size = 0x80000 + }, +}; +#define NUM_PARTITIONS ARRAY_SIZE(partition_info) + +#define WINDOW_SIZE 0x00100000 +#define WINDOW_ADDR 0x00200000 + +static struct map_info netsc520_map = { + .name = "netsc520 Flash Bank", + .size = WINDOW_SIZE, + .bankwidth = 4, + .phys = WINDOW_ADDR, +}; + +#define NUM_FLASH_BANKS ARRAY_SIZE(netsc520_map) + +static struct mtd_info *mymtd; + +static int __init init_netsc520(void) +{ + printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n", + (unsigned long long)netsc520_map.size, + (unsigned long long)netsc520_map.phys); + netsc520_map.virt = ioremap_nocache(netsc520_map.phys, netsc520_map.size); + + if (!netsc520_map.virt) { + printk("Failed to ioremap_nocache\n"); + return -EIO; + } + + simple_map_init(&netsc520_map); + + mymtd = do_map_probe("cfi_probe", &netsc520_map); + if(!mymtd) + mymtd = do_map_probe("map_ram", &netsc520_map); + if(!mymtd) + mymtd = do_map_probe("map_rom", &netsc520_map); + + if (!mymtd) { + iounmap(netsc520_map.virt); + return -ENXIO; + } + + mymtd->owner = THIS_MODULE; + mtd_device_register(mymtd, partition_info, NUM_PARTITIONS); + return 0; +} + +static void __exit cleanup_netsc520(void) +{ + if (mymtd) { + mtd_device_unregister(mymtd); + map_destroy(mymtd); + } + if (netsc520_map.virt) { + iounmap(netsc520_map.virt); + netsc520_map.virt = NULL; + } +} + +module_init(init_netsc520); +module_exit(cleanup_netsc520); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>"); +MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board"); |