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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * mtdram - a test mtd device | |
1da177e4 LT |
3 | * Author: Alexander Larsson <alex@cendio.se> |
4 | * | |
5 | * Copyright (c) 1999 Alexander Larsson <alex@cendio.se> | |
c13cbf3b | 6 | * Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de> |
1da177e4 LT |
7 | * |
8 | * This code is GPL | |
9 | * | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/module.h> |
13 | #include <linux/slab.h> | |
14 | #include <linux/ioport.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/init.h> | |
1da177e4 | 17 | #include <linux/mtd/mtd.h> |
456d9fc9 | 18 | #include <linux/mtd/mtdram.h> |
1da177e4 | 19 | |
1da177e4 LT |
20 | static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE; |
21 | static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE; | |
1da177e4 LT |
22 | #define MTDRAM_TOTAL_SIZE (total_size * 1024) |
23 | #define MTDRAM_ERASE_SIZE (erase_size * 1024) | |
1da177e4 | 24 | |
c13cbf3b JE |
25 | #ifdef MODULE |
26 | module_param(total_size, ulong, 0); | |
27 | MODULE_PARM_DESC(total_size, "Total device size in KiB"); | |
28 | module_param(erase_size, ulong, 0); | |
29 | MODULE_PARM_DESC(erase_size, "Device erase block size in KiB"); | |
30 | #endif | |
1da177e4 LT |
31 | |
32 | // We could store these in the mtd structure, but we only support 1 device.. | |
33 | static struct mtd_info *mtd_info; | |
34 | ||
c13cbf3b | 35 | static int ram_erase(struct mtd_info *mtd, struct erase_info *instr) |
1da177e4 | 36 | { |
c13cbf3b JE |
37 | if (instr->addr + instr->len > mtd->size) |
38 | return -EINVAL; | |
39 | ||
40 | memset((char *)mtd->priv + instr->addr, 0xff, instr->len); | |
41 | ||
42 | instr->state = MTD_ERASE_DONE; | |
43 | mtd_erase_callback(instr); | |
44 | ||
45 | return 0; | |
1da177e4 LT |
46 | } |
47 | ||
c13cbf3b | 48 | static int ram_point(struct mtd_info *mtd, loff_t from, size_t len, |
a98889f3 | 49 | size_t *retlen, void **virt, resource_size_t *phys) |
1da177e4 | 50 | { |
c13cbf3b JE |
51 | if (from + len > mtd->size) |
52 | return -EINVAL; | |
53 | ||
a98889f3 JH |
54 | /* can we return a physical address with this driver? */ |
55 | if (phys) | |
56 | return -EINVAL; | |
57 | ||
58 | *virt = mtd->priv + from; | |
c13cbf3b JE |
59 | *retlen = len; |
60 | return 0; | |
1da177e4 LT |
61 | } |
62 | ||
a98889f3 | 63 | static void ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
1da177e4 | 64 | { |
1da177e4 LT |
65 | } |
66 | ||
402d3265 DH |
67 | /* |
68 | * Allow NOMMU mmap() to directly map the device (if not NULL) | |
69 | * - return the address to which the offset maps | |
70 | * - return -ENOSYS to indicate refusal to do the mapping | |
71 | */ | |
72 | static unsigned long ram_get_unmapped_area(struct mtd_info *mtd, | |
73 | unsigned long len, | |
74 | unsigned long offset, | |
75 | unsigned long flags) | |
76 | { | |
77 | return (unsigned long) mtd->priv + offset; | |
78 | } | |
79 | ||
1da177e4 | 80 | static int ram_read(struct mtd_info *mtd, loff_t from, size_t len, |
c13cbf3b | 81 | size_t *retlen, u_char *buf) |
1da177e4 | 82 | { |
c13cbf3b JE |
83 | if (from + len > mtd->size) |
84 | return -EINVAL; | |
1da177e4 | 85 | |
c13cbf3b | 86 | memcpy(buf, mtd->priv + from, len); |
1da177e4 | 87 | |
c13cbf3b JE |
88 | *retlen = len; |
89 | return 0; | |
1da177e4 LT |
90 | } |
91 | ||
92 | static int ram_write(struct mtd_info *mtd, loff_t to, size_t len, | |
c13cbf3b | 93 | size_t *retlen, const u_char *buf) |
1da177e4 | 94 | { |
c13cbf3b JE |
95 | if (to + len > mtd->size) |
96 | return -EINVAL; | |
1da177e4 | 97 | |
c13cbf3b | 98 | memcpy((char *)mtd->priv + to, buf, len); |
1da177e4 | 99 | |
c13cbf3b JE |
100 | *retlen = len; |
101 | return 0; | |
1da177e4 LT |
102 | } |
103 | ||
104 | static void __exit cleanup_mtdram(void) | |
105 | { | |
c13cbf3b JE |
106 | if (mtd_info) { |
107 | del_mtd_device(mtd_info); | |
f9101210 | 108 | vfree(mtd_info->priv); |
c13cbf3b JE |
109 | kfree(mtd_info); |
110 | } | |
1da177e4 LT |
111 | } |
112 | ||
c13cbf3b JE |
113 | int mtdram_init_device(struct mtd_info *mtd, void *mapped_address, |
114 | unsigned long size, char *name) | |
1da177e4 | 115 | { |
c13cbf3b JE |
116 | memset(mtd, 0, sizeof(*mtd)); |
117 | ||
118 | /* Setup the MTD structure */ | |
119 | mtd->name = name; | |
21c8db9e | 120 | mtd->type = MTD_RAM; |
c13cbf3b JE |
121 | mtd->flags = MTD_CAP_RAM; |
122 | mtd->size = size; | |
783ed81f | 123 | mtd->writesize = 1; |
c13cbf3b JE |
124 | mtd->erasesize = MTDRAM_ERASE_SIZE; |
125 | mtd->priv = mapped_address; | |
126 | ||
127 | mtd->owner = THIS_MODULE; | |
128 | mtd->erase = ram_erase; | |
129 | mtd->point = ram_point; | |
130 | mtd->unpoint = ram_unpoint; | |
402d3265 | 131 | mtd->get_unmapped_area = ram_get_unmapped_area; |
c13cbf3b JE |
132 | mtd->read = ram_read; |
133 | mtd->write = ram_write; | |
134 | ||
135 | if (add_mtd_device(mtd)) { | |
136 | return -EIO; | |
137 | } | |
138 | ||
139 | return 0; | |
1da177e4 | 140 | } |
1da177e4 LT |
141 | |
142 | static int __init init_mtdram(void) | |
143 | { | |
c13cbf3b JE |
144 | void *addr; |
145 | int err; | |
146 | ||
147 | if (!total_size) | |
148 | return -EINVAL; | |
149 | ||
150 | /* Allocate some memory */ | |
151 | mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); | |
152 | if (!mtd_info) | |
153 | return -ENOMEM; | |
154 | ||
155 | addr = vmalloc(MTDRAM_TOTAL_SIZE); | |
156 | if (!addr) { | |
157 | kfree(mtd_info); | |
158 | mtd_info = NULL; | |
159 | return -ENOMEM; | |
160 | } | |
161 | err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device"); | |
162 | if (err) { | |
163 | vfree(addr); | |
164 | kfree(mtd_info); | |
165 | mtd_info = NULL; | |
166 | return err; | |
167 | } | |
168 | memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE); | |
169 | return err; | |
1da177e4 | 170 | } |
1da177e4 LT |
171 | |
172 | module_init(init_mtdram); | |
173 | module_exit(cleanup_mtdram); | |
174 | ||
175 | MODULE_LICENSE("GPL"); | |
176 | MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>"); | |
177 | MODULE_DESCRIPTION("Simulated MTD driver for testing"); |