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
|
/*
* mtdram - a test mtd device
* $Id: mtdram.c,v 1.26 2001/12/01 10:24:18 dwmw2 Exp $
* Author: Alexander Larsson <alex@cendio.se>
*
* Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
*
* This code is GPL
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/mtd/compatmac.h>
#include <linux/mtd/mtd.h>
#ifndef CONFIG_MTDRAM_ABS_POS
#define CONFIG_MTDRAM_ABS_POS 0
#endif
#if CONFIG_MTDRAM_ABS_POS > 0
#include <asm/io.h>
#endif
#ifdef MODULE
static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
MODULE_PARM(total_size,"l");
MODULE_PARM(erase_size,"l");
#define MTDRAM_TOTAL_SIZE (total_size * 1024)
#define MTDRAM_ERASE_SIZE (erase_size * 1024)
#else
#define MTDRAM_TOTAL_SIZE (CONFIG_MTDRAM_TOTAL_SIZE * 1024)
#define MTDRAM_ERASE_SIZE (CONFIG_MTDRAM_ERASE_SIZE * 1024)
#endif
// We could store these in the mtd structure, but we only support 1 device..
static struct mtd_info *mtd_info;
static int
ram_erase(struct mtd_info *mtd, struct erase_info *instr)
{
DEBUG(MTD_DEBUG_LEVEL2, "ram_erase(pos:%ld, len:%ld)\n", (long)instr->addr, (long)instr->len);
if (instr->addr + instr->len > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL1, "ram_erase() out of bounds (%ld > %ld)\n", (long)(instr->addr + instr->len), (long)mtd->size);
return -EINVAL;
}
memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
instr->state = MTD_ERASE_DONE;
if (instr->callback)
(*(instr->callback))(instr);
return 0;
}
static int ram_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf)
{
if (from + len > mtd->size)
return -EINVAL;
*mtdbuf = mtd->priv + from;
*retlen = len;
return 0;
}
static void ram_unpoint (struct mtd_info *mtd, u_char *addr)
{
DEBUG(MTD_DEBUG_LEVEL2, "ram_unpoint\n");
}
static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
DEBUG(MTD_DEBUG_LEVEL2, "ram_read(pos:%ld, len:%ld)\n", (long)from, (long)len);
if (from + len > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL1, "ram_read() out of bounds (%ld > %ld)\n", (long)(from + len), (long)mtd->size);
return -EINVAL;
}
memcpy(buf, mtd->priv + from, len);
*retlen=len;
return 0;
}
static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
DEBUG(MTD_DEBUG_LEVEL2, "ram_write(pos:%ld, len:%ld)\n", (long)to, (long)len);
if (to + len > mtd->size) {
DEBUG(MTD_DEBUG_LEVEL1, "ram_write() out of bounds (%ld > %ld)\n", (long)(to + len), (long)mtd->size);
return -EINVAL;
}
memcpy ((char *)mtd->priv + to, buf, len);
*retlen=len;
return 0;
}
static void __exit cleanup_mtdram(void)
{
if (mtd_info) {
del_mtd_device(mtd_info);
if (mtd_info->priv)
#if CONFIG_MTDRAM_ABS_POS > 0
iounmap(mtd_info->priv);
#else
vfree(mtd_info->priv);
#endif
kfree(mtd_info);
}
}
int __init init_mtdram(void)
{
// Allocate some memory
mtd_info = (struct mtd_info *)kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
if (!mtd_info)
return -ENOMEM;
memset(mtd_info, 0, sizeof(*mtd_info));
// Setup the MTD structure
mtd_info->name = "mtdram test device";
mtd_info->type = MTD_RAM;
mtd_info->flags = MTD_CAP_RAM;
mtd_info->size = MTDRAM_TOTAL_SIZE;
mtd_info->erasesize = MTDRAM_ERASE_SIZE;
#if CONFIG_MTDRAM_ABS_POS > 0
mtd_info->priv = ioremap(CONFIG_MTDRAM_ABS_POS, MTDRAM_TOTAL_SIZE);
#else
mtd_info->priv = vmalloc(MTDRAM_TOTAL_SIZE);
#endif
if (!mtd_info->priv) {
DEBUG(MTD_DEBUG_LEVEL1, "Failed to vmalloc(/ioremap) memory region of size %ld (ABS_POS:%ld)\n", (long)MTDRAM_TOTAL_SIZE, (long)CONFIG_MTDRAM_ABS_POS);
kfree(mtd_info);
mtd_info = NULL;
return -ENOMEM;
}
memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
mtd_info->module = THIS_MODULE;
mtd_info->erase = ram_erase;
mtd_info->point = ram_point;
mtd_info->unpoint = ram_unpoint;
mtd_info->read = ram_read;
mtd_info->write = ram_write;
if (add_mtd_device(mtd_info)) {
#if CONFIG_MTDRAM_ABS_POS > 0
iounmap(mtd_info->priv);
#else
vfree(mtd_info->priv);
#endif
kfree(mtd_info);
mtd_info = NULL;
return -EIO;
}
return 0;
}
module_init(init_mtdram);
module_exit(cleanup_mtdram);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
MODULE_DESCRIPTION("Simulated MTD driver for testing");
|
