1/*
2 * $Id: edb7312.c,v 1.1.1.1 2007/08/03 18:52:43 Exp $
3 *
4 * Handle mapping of the NOR flash on Cogent EDB7312 boards
5 *
6 * Copyright 2002 SYSGO Real-Time Solutions GmbH
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 version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <asm/io.h>
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/map.h>
20
21#ifdef CONFIG_MTD_PARTITIONS
22#include <linux/mtd/partitions.h>
23#endif
24
25#define WINDOW_ADDR 0x00000000      /* physical properties of flash */
26#define WINDOW_SIZE 0x01000000
27#define BUSWIDTH    2
28#define FLASH_BLOCKSIZE_MAIN	0x20000
29#define FLASH_NUMBLOCKS_MAIN	128
30/* can be "cfi_probe", "jedec_probe", "map_rom", NULL }; */
31#define PROBETYPES { "cfi_probe", NULL }
32
33#define MSG_PREFIX "EDB7312-NOR:"   /* prefix for our printk()'s */
34#define MTDID      "edb7312-nor"    /* for mtdparts= partitioning */
35
36static struct mtd_info *mymtd;
37
38struct map_info edb7312nor_map = {
39	.name = "NOR flash on EDB7312",
40	.size = WINDOW_SIZE,
41	.bankwidth = BUSWIDTH,
42	.phys = WINDOW_ADDR,
43};
44
45#ifdef CONFIG_MTD_PARTITIONS
46
47/*
48 * MTD partitioning stuff
49 */
50static struct mtd_partition static_partitions[3] =
51{
52	{
53		.name = "ARMboot",
54		.size = 0x40000,
55		.offset = 0
56	},
57	{
58		.name = "Kernel",
59		.size = 0x200000,
60		.offset = 0x40000
61	},
62	{
63		.name = "RootFS",
64		.size = 0xDC0000,
65		.offset = 0x240000
66	},
67};
68
69static const char *probes[] = { "RedBoot", "cmdlinepart", NULL };
70
71#endif
72
73static int                   mtd_parts_nb = 0;
74static struct mtd_partition *mtd_parts    = 0;
75
76int __init init_edb7312nor(void)
77{
78	static const char *rom_probe_types[] = PROBETYPES;
79	const char **type;
80	const char *part_type = 0;
81
82       	printk(KERN_NOTICE MSG_PREFIX "0x%08x at 0x%08x\n",
83	       WINDOW_SIZE, WINDOW_ADDR);
84	edb7312nor_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
85
86	if (!edb7312nor_map.virt) {
87		printk(MSG_PREFIX "failed to ioremap\n");
88		return -EIO;
89	}
90
91	simple_map_init(&edb7312nor_map);
92
93	mymtd = 0;
94	type = rom_probe_types;
95	for(; !mymtd && *type; type++) {
96		mymtd = do_map_probe(*type, &edb7312nor_map);
97	}
98	if (mymtd) {
99		mymtd->owner = THIS_MODULE;
100
101#ifdef CONFIG_MTD_PARTITIONS
102		mtd_parts_nb = parse_mtd_partitions(mymtd, probes, &mtd_parts, MTDID);
103		if (mtd_parts_nb > 0)
104		  part_type = "detected";
105
106		if (mtd_parts_nb == 0)
107		{
108			mtd_parts = static_partitions;
109			mtd_parts_nb = ARRAY_SIZE(static_partitions);
110			part_type = "static";
111		}
112#endif
113		add_mtd_device(mymtd);
114		if (mtd_parts_nb == 0)
115		  printk(KERN_NOTICE MSG_PREFIX "no partition info available\n");
116		else
117		{
118			printk(KERN_NOTICE MSG_PREFIX
119			       "using %s partition definition\n", part_type);
120			add_mtd_partitions(mymtd, mtd_parts, mtd_parts_nb);
121		}
122		return 0;
123	}
124
125	iounmap((void *)edb7312nor_map.virt);
126	return -ENXIO;
127}
128
129static void __exit cleanup_edb7312nor(void)
130{
131	if (mymtd) {
132		del_mtd_device(mymtd);
133		map_destroy(mymtd);
134	}
135	if (edb7312nor_map.virt) {
136		iounmap((void *)edb7312nor_map.virt);
137		edb7312nor_map.virt = 0;
138	}
139}
140
141module_init(init_edb7312nor);
142module_exit(cleanup_edb7312nor);
143
144MODULE_LICENSE("GPL");
145MODULE_AUTHOR("Marius Groeger <mag@sysgo.de>");
146MODULE_DESCRIPTION("Generic configurable MTD map driver");
147