aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mtd/maps/wr_sbc82xx_flash.c
blob: 82b887b05707127785d38a33e7d715394beae914 (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
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: wr_sbc82xx_flash.c,v 1.7 2004/11/04 13:24:15 gleixner Exp $
 *
 * Map for flash chips on Wind River PowerQUICC II SBC82xx board.
 *
 * Copyright (C) 2004 Red Hat, Inc.
 *
 * Author: David Woodhouse <dwmw2@infradead.org>
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
#include <linux/config.h>
#include <linux/mtd/partitions.h>

#include <asm/immap_cpm2.h>

static struct mtd_info *sbcmtd[3];
static struct mtd_partition *sbcmtd_parts[3];

struct map_info sbc82xx_flash_map[3] = {
	{.name = "Boot flash"},
	{.name = "Alternate boot flash"},
	{.name = "User flash"}
};

static struct mtd_partition smallflash_parts[] = {
	{
		.name =		"space",
		.size =		0x100000,
		.offset =	0,
	}, {
		.name =		"bootloader",
		.size =		MTDPART_SIZ_FULL,
		.offset =	MTDPART_OFS_APPEND,
	}
};

static struct mtd_partition bigflash_parts[] = {
	{
		.name =		"bootloader",
		.size =		0x00100000,
		.offset =	0,
	}, {
		.name =		"file system",
		.size =		0x01f00000,
		.offset =	MTDPART_OFS_APPEND,
	}, {
		.name =		"boot config",
		.size =		0x00100000,
		.offset =	MTDPART_OFS_APPEND,
	}, {
		.name =		"space",
		.size =		0x01f00000,
		.offset =	MTDPART_OFS_APPEND,
	}
};

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

#define init_sbc82xx_one_flash(map, br, or)			\
do {								\
	(map).phys = (br & 1) ? (br & 0xffff8000) : 0;		\
	(map).size = (br & 1) ? (~(or & 0xffff8000) + 1) : 0;	\
	switch (br & 0x00001800) {				\
	case 0x00000000:					\
	case 0x00000800:	(map).bankwidth = 1;	break;	\
	case 0x00001000:	(map).bankwidth = 2;	break;	\
	case 0x00001800:	(map).bankwidth = 4;	break;	\
	}							\
} while (0);

int __init init_sbc82xx_flash(void)
{
	volatile memctl_cpm2_t *mc = &cpm2_immr->im_memctl;
	int bigflash;
	int i;

#ifdef CONFIG_SBC8560
	mc = ioremap(0xff700000 + 0x5000, sizeof(memctl_cpm2_t));
#else
	mc = &cpm2_immr->im_memctl;
#endif

	bigflash = 1;
	if ((mc->memc_br0 & 0x00001800) == 0x00001800)
		bigflash = 0;

	init_sbc82xx_one_flash(sbc82xx_flash_map[0], mc->memc_br0, mc->memc_or0);
	init_sbc82xx_one_flash(sbc82xx_flash_map[1], mc->memc_br6, mc->memc_or6);
	init_sbc82xx_one_flash(sbc82xx_flash_map[2], mc->memc_br1, mc->memc_or1);

#ifdef CONFIG_SBC8560
	iounmap((void *) mc);
#endif

	for (i=0; i<3; i++) {
		int8_t flashcs[3] = { 0, 6, 1 };
		int nr_parts;

		printk(KERN_NOTICE "PowerQUICC II %s (%ld MiB on CS%d",
		       sbc82xx_flash_map[i].name,
		       (sbc82xx_flash_map[i].size >> 20),
		       flashcs[i]);
		if (!sbc82xx_flash_map[i].phys) {
			/* We know it can't be at zero. */
			printk("): disabled by bootloader.\n");
			continue;
		}
		printk(" at %08lx)\n",  sbc82xx_flash_map[i].phys);

		sbc82xx_flash_map[i].virt = ioremap(sbc82xx_flash_map[i].phys, sbc82xx_flash_map[i].size);

		if (!sbc82xx_flash_map[i].virt) {
			printk("Failed to ioremap\n");
			continue;
		}

		simple_map_init(&sbc82xx_flash_map[i]);

		sbcmtd[i] = do_map_probe("cfi_probe", &sbc82xx_flash_map[i]);

		if (!sbcmtd[i])
			continue;

		sbcmtd[i]->owner = THIS_MODULE;

		nr_parts = parse_mtd_partitions(sbcmtd[i], part_probes,
						&sbcmtd_parts[i], 0);
		if (nr_parts > 0) {
			add_mtd_partitions (sbcmtd[i], sbcmtd_parts[i], nr_parts);
			continue;
		}

		/* No partitioning detected. Use default */
		if (i == 2) {
			add_mtd_device(sbcmtd[i]);
		} else if (i == bigflash) {
			add_mtd_partitions (sbcmtd[i], bigflash_parts, ARRAY_SIZE(bigflash_parts));
		} else {
			add_mtd_partitions (sbcmtd[i], smallflash_parts, ARRAY_SIZE(smallflash_parts));
		}
	}
	return 0;
}

static void __exit cleanup_sbc82xx_flash(void)
{
	int i;

	for (i=0; i<3; i++) {
		if (!sbcmtd[i])
			continue;

		if (i<2 || sbcmtd_parts[i])
			del_mtd_partitions(sbcmtd[i]);
		else
			del_mtd_device(sbcmtd[i]);
			
		kfree(sbcmtd_parts[i]);
		map_destroy(sbcmtd[i]);
		
		iounmap((void *)sbc82xx_flash_map[i].virt);
		sbc82xx_flash_map[i].virt = 0;
	}
}

module_init(init_sbc82xx_flash);
module_exit(cleanup_sbc82xx_flash);


MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Flash map driver for WindRiver PowerQUICC II");