summaryrefslogtreecommitdiff
path: root/drivers/mtd/maps/mainstone-flash.c
blob: da0f8a692628a253f7a95831d8d44cb9664683d6 (plain)
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
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
/*
 * $Id:  $
 *
 * Map driver for the Mainstone developer platform.
 *
 * Author:	Nicolas Pitre
 * Copyright:	(C) 2001 MontaVista Software Inc.
 * 
 * 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 <linux/dma-mapping.h>
#include <linux/slab.h>

#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/mtd/partitions.h>

#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/mainstone.h>


#define ROM_ADDR	0x00000000
#define FLASH_ADDR	0x04000000

#define WINDOW_SIZE 	0x04000000

static void mainstone_map_inval_cache(struct map_info *map, unsigned long from,
				      ssize_t len)
{
	consistent_sync((char *)map->cached + from, len, DMA_FROM_DEVICE);
}

static struct map_info mainstone_maps[2] = { {
	.size =		WINDOW_SIZE,
	.phys =		PXA_CS0_PHYS,
	.inval_cache = 	mainstone_map_inval_cache,
}, {
	.size =		WINDOW_SIZE,
	.phys =		PXA_CS1_PHYS,
	.inval_cache = 	mainstone_map_inval_cache,
} };

static struct mtd_partition mainstone_partitions[] = {
	{
		.name =		"Bootloader",
		.size =		0x00040000,
		.offset =	0,
		.mask_flags =	MTD_WRITEABLE  /* force read-only */
	},{
		.name =		"Kernel",
		.size =		0x00400000,
		.offset =	0x00040000,
	},{
		.name =		"Filesystem",
		.size =		MTDPART_SIZ_FULL,
		.offset =	0x00440000
	}
};

static struct mtd_info *mymtds[2];
static struct mtd_partition *parsed_parts[2];
static int nr_parsed_parts[2];

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

static int __init init_mainstone(void)
{
	int SW7 = 0;  /* FIXME: get from SCR (Mst doc section 3.2.1.1) */
	int ret = 0, i;

	mainstone_maps[0].bankwidth = (BOOT_DEF & 1) ? 2 : 4;
	mainstone_maps[1].bankwidth = 4;

	/* Compensate for SW7 which swaps the flash banks */
	mainstone_maps[SW7].name = "processor flash";
	mainstone_maps[SW7 ^ 1].name = "main board flash";

	printk(KERN_NOTICE "Mainstone configured to boot from %s\n",
	       mainstone_maps[0].name);

	for (i = 0; i < 2; i++) {
		mainstone_maps[i].virt = ioremap(mainstone_maps[i].phys,
						 WINDOW_SIZE);
		if (!mainstone_maps[i].virt) {
			printk(KERN_WARNING "Failed to ioremap %s\n", 
			       mainstone_maps[i].name);
			if (!ret)
				ret = -ENOMEM;
			continue;
		}
		mainstone_maps[i].cached = 
			ioremap_cached(mainstone_maps[i].phys, WINDOW_SIZE);
		if (!mainstone_maps[i].cached)
			printk(KERN_WARNING "Failed to ioremap cached %s\n",
			       mainstone_maps[i].name);
		simple_map_init(&mainstone_maps[i]);

		printk(KERN_NOTICE 
		       "Probing %s at physical address 0x%08lx"
		       " (%d-bit bankwidth)\n",
		       mainstone_maps[i].name, mainstone_maps[i].phys, 
		       mainstone_maps[i].bankwidth * 8);

		mymtds[i] = do_map_probe("cfi_probe", &mainstone_maps[i]);
		
		if (!mymtds[i]) {
			iounmap((void *)mainstone_maps[i].virt);
			if (mainstone_maps[i].cached)
				iounmap(mainstone_maps[i].cached);
			if (!ret)
				ret = -EIO;
			continue;
		}
		mymtds[i]->owner = THIS_MODULE;

		ret = parse_mtd_partitions(mymtds[i], probes,
					   &parsed_parts[i], 0);

		if (ret > 0)
			nr_parsed_parts[i] = ret;
	}

	if (!mymtds[0] && !mymtds[1])
		return ret;
	
	for (i = 0; i < 2; i++) {
		if (!mymtds[i]) {
			printk(KERN_WARNING "%s is absent. Skipping\n", 
			       mainstone_maps[i].name);
		} else if (nr_parsed_parts[i]) {
			add_mtd_partitions(mymtds[i], parsed_parts[i], 
					   nr_parsed_parts[i]);
		} else if (!i) {
			printk("Using static partitions on %s\n",
			       mainstone_maps[i].name);
			add_mtd_partitions(mymtds[i], mainstone_partitions, 
					   ARRAY_SIZE(mainstone_partitions));
		} else {
			printk("Registering %s as whole device\n", 
			       mainstone_maps[i].name);
			add_mtd_device(mymtds[i]);
		}
	}
	return 0;
}

static void __exit cleanup_mainstone(void)
{
	int i;
	for (i = 0; i < 2; i++) {
		if (!mymtds[i])
			continue;

		if (nr_parsed_parts[i] || !i)
			del_mtd_partitions(mymtds[i]);
		else
			del_mtd_device(mymtds[i]);

		map_destroy(mymtds[i]);
		iounmap((void *)mainstone_maps[i].virt);
		if (mainstone_maps[i].cached)
			iounmap(mainstone_maps[i].cached);
		kfree(parsed_parts[i]);
	}
}

module_init(init_mainstone);
module_exit(cleanup_mainstone);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
MODULE_DESCRIPTION("MTD map driver for Intel Mainstone");