summaryrefslogtreecommitdiff
path: root/drivers/mtd/maps/dmv182.c
blob: e0558b0b2fe65946ecfd00b3a05f57f79624633d (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
/*
 * drivers/mtd/maps/dmv182.c
 *
 * Flash map driver for the Dy4 SVME182 board
 *
 * $Id: dmv182.c,v 1.6 2005/11/07 11:14:26 gleixner Exp $
 *
 * Copyright 2003-2004, TimeSys Corporation
 *
 * Based on the SVME181 flash map, by Tom Nelson, Dot4, Inc. for TimeSys Corp.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

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

/*
 * This driver currently handles only the 16MiB user flash bank 1 on the
 * board.  It does not provide access to bank 0 (contains the Dy4 FFW), bank 2
 * (VxWorks boot), or the optional 48MiB expansion flash.
 *
 * scott.wood@timesys.com: On the newer boards with 128MiB flash, it
 * now supports the first 96MiB (the boot flash bank containing FFW
 * is excluded).  The VxWorks loader is in partition 1.
 */

#define FLASH_BASE_ADDR 0xf0000000
#define FLASH_BANK_SIZE (128*1024*1024)

MODULE_AUTHOR("Scott Wood, TimeSys Corporation <scott.wood@timesys.com>");
MODULE_DESCRIPTION("User-programmable flash device on the Dy4 SVME182 board");
MODULE_LICENSE("GPL");

static struct map_info svme182_map = {
	.name		= "Dy4 SVME182",
	.bankwidth	= 32,
	.size		=  128 * 1024 * 1024
};

#define BOOTIMAGE_PART_SIZE		((6*1024*1024)-RESERVED_PART_SIZE)

// Allow 6MiB for the kernel
#define NEW_BOOTIMAGE_PART_SIZE  (6 * 1024 * 1024)
// Allow 1MiB for the bootloader
#define NEW_BOOTLOADER_PART_SIZE (1024 * 1024)
// Use the remaining 9MiB at the end of flash for the RFS
#define NEW_RFS_PART_SIZE        (0x01000000 - NEW_BOOTLOADER_PART_SIZE - \
                                  NEW_BOOTIMAGE_PART_SIZE)

static struct mtd_partition svme182_partitions[] = {
	// The Lower PABS is only 128KiB, but the partition code doesn't
	// like partitions that don't end on the largest erase block
	// size of the device, even if all of the erase blocks in the
	// partition are small ones.  The hardware should prevent
	// writes to the actual PABS areas.
	{
		name:       "Lower PABS and CPU 0 bootloader or kernel",
		size:       6*1024*1024,
		offset:     0,
	},
	{
		name:       "Root Filesystem",
		size:       10*1024*1024,
		offset:     MTDPART_OFS_NXTBLK
	},
	{
		name:       "CPU1 Bootloader",
		size:       1024*1024,
		offset:     MTDPART_OFS_NXTBLK,
	},
	{
		name:       "Extra",
		size:       110*1024*1024,
		offset:     MTDPART_OFS_NXTBLK
	},
	{
		name:       "Foundation Firmware and Upper PABS",
		size:       1024*1024,
		offset:     MTDPART_OFS_NXTBLK,
		mask_flags: MTD_WRITEABLE // read-only
	}
};

static struct mtd_info *this_mtd;

static int __init init_svme182(void)
{
	struct mtd_partition *partitions;
	int num_parts = ARRAY_SIZE(svme182_partitions);

	partitions = svme182_partitions;

	svme182_map.virt = ioremap(FLASH_BASE_ADDR, svme182_map.size);

	if (svme182_map.virt == 0) {
		printk("Failed to ioremap FLASH memory area.\n");
		return -EIO;
	}

	simple_map_init(&svme182_map);

	this_mtd = do_map_probe("cfi_probe", &svme182_map);
	if (!this_mtd)
	{
		iounmap((void *)svme182_map.virt);
		return -ENXIO;
	}

	printk(KERN_NOTICE "SVME182 flash device: %dMiB at 0x%08x\n",
		   this_mtd->size >> 20, FLASH_BASE_ADDR);

	this_mtd->owner = THIS_MODULE;
	add_mtd_partitions(this_mtd, partitions, num_parts);

	return 0;
}

static void __exit cleanup_svme182(void)
{
	if (this_mtd)
	{
		del_mtd_partitions(this_mtd);
		map_destroy(this_mtd);
	}

	if (svme182_map.virt)
	{
		iounmap((void *)svme182_map.virt);
		svme182_map.virt = 0;
	}

	return;
}

module_init(init_svme182);
module_exit(cleanup_svme182);