aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/edb7312.c
blob: b48a3473ffc16103f65947f471e5d35169118966 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/*
 * $Id: edb7312.c,v 1.14 2005/11/07 11:14:27 gleixner Exp $
 *
 * Handle mapping of the NOR flash on Cogent EDB7312 boards
 *
 * Copyright 2002 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 version 2 as
 * published by the Free Software Foundation.
 */

#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/config.h>

#ifdef CONFIG_MTD_PARTITIONS
#include <linux/mtd/partitions.h>
#endif

#define WINDOW_ADDR 0x00000000      /* physical properties of flash */
#define WINDOW_SIZE 0x01000000
#define BUSWIDTH    2
#define FLASH_BLOCKSIZE_MAIN	0x20000
#define FLASH_NUMBLOCKS_MAIN	128
/* can be "cfi_probe", "jedec_probe", "map_rom", NULL }; */
#define PROBETYPES { "cfi_probe", NULL }

#define MSG_PREFIX "EDB7312-NOR:"   /* prefix for our printk()'s */
#define MTDID      "edb7312-nor"    /* for mtdparts= partitioning */

static struct mtd_info *mymtd;

struct map_info edb7312nor_map = {
	.name = "NOR flash on EDB7312",
	.size = WINDOW_SIZE,
	.bankwidth = BUSWIDTH,
	.phys = WINDOW_ADDR,
};

#ifdef CONFIG_MTD_PARTITIONS

/*
 * MTD partitioning stuff
 */
static struct mtd_partition static_partitions[3] =
{
	{
		.name = "ARMboot",
		.size = 0x40000,
		.offset = 0
	},
	{
		.name = "Kernel",
		.size = 0x200000,
		.offset = 0x40000
	},
	{
		.name = "RootFS",
		.size = 0xDC0000,
		.offset = 0x240000
	},
};

static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };

#endif

static int                   mtd_parts_nb = 0;
static struct mtd_partition *mtd_parts    = 0;

int __init init_edb7312nor(void)
{
	static const char *rom_probe_types[] = PROBETYPES;
	const char **type;
	const char *part_type = 0;

       	printk(KERN_NOTICE MSG_PREFIX "0x%08x at 0x%08x\n",
	       WINDOW_SIZE, WINDOW_ADDR);
	edb7312nor_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);

	if (!edb7312nor_map.virt) {
		printk(MSG_PREFIX "failed to ioremap\n");
		return -EIO;
	}

	simple_map_init(&edb7312nor_map);

	mymtd = 0;
	type = rom_probe_types;
	for(; !mymtd && *type; type++) {
		mymtd = do_map_probe(*type, &edb7312nor_map);
	}
	if (mymtd) {
		mymtd->owner = THIS_MODULE;

#ifdef CONFIG_MTD_PARTITIONS
		mtd_parts_nb = parse_mtd_partitions(mymtd, probes, &mtd_parts, MTDID);
		if (mtd_parts_nb > 0)
		  part_type = "detected";

		if (mtd_parts_nb == 0)
		{
			mtd_parts = static_partitions;
			mtd_parts_nb = ARRAY_SIZE(static_partitions);
			part_type = "static";
		}
#endif
		add_mtd_device(mymtd);
		if (mtd_parts_nb == 0)
		  printk(KERN_NOTICE MSG_PREFIX "no partition info available\n");
		else
		{
			printk(KERN_NOTICE MSG_PREFIX
			       "using %s partition definition\n", part_type);
			add_mtd_partitions(mymtd, mtd_parts, mtd_parts_nb);
		}
		return 0;
	}

	iounmap((void *)edb7312nor_map.virt);
	return -ENXIO;
}

static void __exit cleanup_edb7312nor(void)
{
	if (mymtd) {
		del_mtd_device(mymtd);
		map_destroy(mymtd);
	}
	if (edb7312nor_map.virt) {
		iounmap((void *)edb7312nor_map.virt);
		edb7312nor_map.virt = 0;
	}
}

module_init(init_edb7312nor);
module_exit(cleanup_edb7312nor);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
MODULE_DESCRIPTION("Generic configurable MTD map driver");