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 * $Id: netsc520.c,v 1.1.1.1 2007/08/03 18:52:44 Exp $
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
21 *
22 * The NetSc520 is a demonstration board for the Elan Sc520 processor available
23 * from AMD.  It has a single back of 16 megs of 32-bit Flash ROM and another
24 * 16 megs of SDRAM.
25 */
26
27#include <linux/module.h>
28#include <linux/types.h>
29#include <linux/kernel.h>
30#include <linux/init.h>
31#include <asm/io.h>
32#include <linux/mtd/mtd.h>
33#include <linux/mtd/map.h>
34#include <linux/mtd/partitions.h>
35
36
37/*
38** The single, 16 megabyte flash bank is divided into four virtual
39** partitions.  The first partition is 768 KiB and is intended to
40** store the kernel image loaded by the bootstrap loader.  The second
41** partition is 256 KiB and holds the BIOS image.  The third
42** partition is 14.5 MiB and is intended for the flash file system
43** image.  The last partition is 512 KiB and contains another copy
44** of the BIOS image and the reset vector.
45**
46** Only the third partition should be mounted.  The first partition
47** should not be mounted, but it can erased and written to using the
48** MTD character routines.  The second and fourth partitions should
49** not be touched - it is possible to corrupt the BIOS image by
50** mounting these partitions, and potentially the board will not be
51** recoverable afterwards.
52*/
53
54/* partition_info gives details on the logical partitions that the split the
55 * single flash device into. If the size if zero we use up to the end of the
56 * device. */
57static struct mtd_partition partition_info[]={
58    {
59	    .name = "NetSc520 boot kernel",
60	    .offset = 0,
61	    .size = 0xc0000
62    },
63    {
64	    .name = "NetSc520 Low BIOS",
65	    .offset = 0xc0000,
66	    .size = 0x40000
67    },
68    {
69	    .name = "NetSc520 file system",
70	    .offset = 0x100000,
71	    .size = 0xe80000
72    },
73    {
74	    .name = "NetSc520 High BIOS",
75	    .offset = 0xf80000,
76	    .size = 0x80000
77    },
78};
79#define NUM_PARTITIONS ARRAY_SIZE(partition_info)
80
81#define WINDOW_SIZE	0x00100000
82#define WINDOW_ADDR	0x00200000
83
84static struct map_info netsc520_map = {
85	.name = "netsc520 Flash Bank",
86	.size = WINDOW_SIZE,
87	.bankwidth = 4,
88	.phys = WINDOW_ADDR,
89};
90
91#define NUM_FLASH_BANKS	ARRAY_SIZE(netsc520_map)
92
93static struct mtd_info *mymtd;
94
95static int __init init_netsc520(void)
96{
97	printk(KERN_NOTICE "NetSc520 flash device: 0x%Lx at 0x%Lx\n",
98			(unsigned long long)netsc520_map.size,
99			(unsigned long long)netsc520_map.phys);
100	netsc520_map.virt = ioremap_nocache(netsc520_map.phys, netsc520_map.size);
101
102	if (!netsc520_map.virt) {
103		printk("Failed to ioremap_nocache\n");
104		return -EIO;
105	}
106
107	simple_map_init(&netsc520_map);
108
109	mymtd = do_map_probe("cfi_probe", &netsc520_map);
110	if(!mymtd)
111		mymtd = do_map_probe("map_ram", &netsc520_map);
112	if(!mymtd)
113		mymtd = do_map_probe("map_rom", &netsc520_map);
114
115	if (!mymtd) {
116		iounmap(netsc520_map.virt);
117		return -ENXIO;
118	}
119
120	mymtd->owner = THIS_MODULE;
121	add_mtd_partitions( mymtd, partition_info, NUM_PARTITIONS );
122	return 0;
123}
124
125static void __exit cleanup_netsc520(void)
126{
127	if (mymtd) {
128		del_mtd_partitions(mymtd);
129		map_destroy(mymtd);
130	}
131	if (netsc520_map.virt) {
132		iounmap(netsc520_map.virt);
133		netsc520_map.virt = NULL;
134	}
135}
136
137module_init(init_netsc520);
138module_exit(cleanup_netsc520);
139
140MODULE_LICENSE("GPL");
141MODULE_AUTHOR("Mark Langsdorf <mark.langsdorf@amd.com>");
142MODULE_DESCRIPTION("MTD map driver for AMD NetSc520 Demonstration Board");
143