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; | |
c67682c5 | 22 | static unsigned long writebuf_size = 64; |
1da177e4 LT |
23 | #define MTDRAM_TOTAL_SIZE (total_size * 1024) |
24 | #define MTDRAM_ERASE_SIZE (erase_size * 1024) | |
1da177e4 | 25 | |
c13cbf3b JE |
26 | #ifdef MODULE |
27 | module_param(total_size, ulong, 0); | |
28 | MODULE_PARM_DESC(total_size, "Total device size in KiB"); | |
29 | module_param(erase_size, ulong, 0); | |
30 | MODULE_PARM_DESC(erase_size, "Device erase block size in KiB"); | |
c67682c5 AS |
31 | module_param(writebuf_size, ulong, 0); |
32 | MODULE_PARM_DESC(writebuf_size, "Device write buf size in Bytes (Default: 64)"); | |
c13cbf3b | 33 | #endif |
1da177e4 LT |
34 | |
35 | // We could store these in the mtd structure, but we only support 1 device.. | |
36 | static struct mtd_info *mtd_info; | |
37 | ||
ab84fce5 DY |
38 | static int check_offs_len(struct mtd_info *mtd, loff_t ofs, uint64_t len) |
39 | { | |
40 | int ret = 0; | |
41 | ||
42 | /* Start address must align on block boundary */ | |
43 | if (mtd_mod_by_eb(ofs, mtd)) { | |
44 | pr_debug("%s: unaligned address\n", __func__); | |
45 | ret = -EINVAL; | |
46 | } | |
47 | ||
48 | /* Length must align on block boundary */ | |
49 | if (mtd_mod_by_eb(len, mtd)) { | |
50 | pr_debug("%s: length not block aligned\n", __func__); | |
51 | ret = -EINVAL; | |
52 | } | |
53 | ||
54 | return ret; | |
55 | } | |
56 | ||
c13cbf3b | 57 | static int ram_erase(struct mtd_info *mtd, struct erase_info *instr) |
1da177e4 | 58 | { |
ab84fce5 DY |
59 | if (check_offs_len(mtd, instr->addr, instr->len)) |
60 | return -EINVAL; | |
c13cbf3b | 61 | memset((char *)mtd->priv + instr->addr, 0xff, instr->len); |
c13cbf3b JE |
62 | instr->state = MTD_ERASE_DONE; |
63 | mtd_erase_callback(instr); | |
c13cbf3b | 64 | return 0; |
1da177e4 LT |
65 | } |
66 | ||
c13cbf3b | 67 | static int ram_point(struct mtd_info *mtd, loff_t from, size_t len, |
a98889f3 | 68 | size_t *retlen, void **virt, resource_size_t *phys) |
1da177e4 | 69 | { |
a98889f3 | 70 | *virt = mtd->priv + from; |
c13cbf3b JE |
71 | *retlen = len; |
72 | return 0; | |
1da177e4 LT |
73 | } |
74 | ||
5e4e6e3f | 75 | static int ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len) |
1da177e4 | 76 | { |
5e4e6e3f | 77 | return 0; |
1da177e4 LT |
78 | } |
79 | ||
402d3265 DH |
80 | /* |
81 | * Allow NOMMU mmap() to directly map the device (if not NULL) | |
82 | * - return the address to which the offset maps | |
83 | * - return -ENOSYS to indicate refusal to do the mapping | |
84 | */ | |
85 | static unsigned long ram_get_unmapped_area(struct mtd_info *mtd, | |
86 | unsigned long len, | |
87 | unsigned long offset, | |
88 | unsigned long flags) | |
89 | { | |
90 | return (unsigned long) mtd->priv + offset; | |
91 | } | |
92 | ||
1da177e4 | 93 | static int ram_read(struct mtd_info *mtd, loff_t from, size_t len, |
c13cbf3b | 94 | size_t *retlen, u_char *buf) |
1da177e4 | 95 | { |
c13cbf3b | 96 | memcpy(buf, mtd->priv + from, len); |
c13cbf3b JE |
97 | *retlen = len; |
98 | return 0; | |
1da177e4 LT |
99 | } |
100 | ||
101 | static int ram_write(struct mtd_info *mtd, loff_t to, size_t len, | |
c13cbf3b | 102 | size_t *retlen, const u_char *buf) |
1da177e4 | 103 | { |
c13cbf3b | 104 | memcpy((char *)mtd->priv + to, buf, len); |
c13cbf3b JE |
105 | *retlen = len; |
106 | return 0; | |
1da177e4 LT |
107 | } |
108 | ||
109 | static void __exit cleanup_mtdram(void) | |
110 | { | |
c13cbf3b | 111 | if (mtd_info) { |
ee0e87b1 | 112 | mtd_device_unregister(mtd_info); |
f9101210 | 113 | vfree(mtd_info->priv); |
c13cbf3b JE |
114 | kfree(mtd_info); |
115 | } | |
1da177e4 LT |
116 | } |
117 | ||
c13cbf3b | 118 | int mtdram_init_device(struct mtd_info *mtd, void *mapped_address, |
0a8899b3 | 119 | unsigned long size, const char *name) |
1da177e4 | 120 | { |
c13cbf3b JE |
121 | memset(mtd, 0, sizeof(*mtd)); |
122 | ||
123 | /* Setup the MTD structure */ | |
124 | mtd->name = name; | |
21c8db9e | 125 | mtd->type = MTD_RAM; |
c13cbf3b JE |
126 | mtd->flags = MTD_CAP_RAM; |
127 | mtd->size = size; | |
783ed81f | 128 | mtd->writesize = 1; |
c67682c5 | 129 | mtd->writebufsize = writebuf_size; |
c13cbf3b JE |
130 | mtd->erasesize = MTDRAM_ERASE_SIZE; |
131 | mtd->priv = mapped_address; | |
132 | ||
133 | mtd->owner = THIS_MODULE; | |
3c3c10bb AB |
134 | mtd->_erase = ram_erase; |
135 | mtd->_point = ram_point; | |
136 | mtd->_unpoint = ram_unpoint; | |
137 | mtd->_get_unmapped_area = ram_get_unmapped_area; | |
138 | mtd->_read = ram_read; | |
139 | mtd->_write = ram_write; | |
c13cbf3b | 140 | |
ee0e87b1 | 141 | if (mtd_device_register(mtd, NULL, 0)) |
c13cbf3b | 142 | return -EIO; |
c13cbf3b JE |
143 | |
144 | return 0; | |
1da177e4 | 145 | } |
1da177e4 LT |
146 | |
147 | static int __init init_mtdram(void) | |
148 | { | |
c13cbf3b JE |
149 | void *addr; |
150 | int err; | |
151 | ||
152 | if (!total_size) | |
153 | return -EINVAL; | |
154 | ||
155 | /* Allocate some memory */ | |
156 | mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); | |
157 | if (!mtd_info) | |
158 | return -ENOMEM; | |
159 | ||
160 | addr = vmalloc(MTDRAM_TOTAL_SIZE); | |
161 | if (!addr) { | |
162 | kfree(mtd_info); | |
163 | mtd_info = NULL; | |
164 | return -ENOMEM; | |
165 | } | |
166 | err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device"); | |
167 | if (err) { | |
168 | vfree(addr); | |
169 | kfree(mtd_info); | |
170 | mtd_info = NULL; | |
171 | return err; | |
172 | } | |
173 | memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE); | |
174 | return err; | |
1da177e4 | 175 | } |
1da177e4 LT |
176 | |
177 | module_init(init_mtdram); | |
178 | module_exit(cleanup_mtdram); | |
179 | ||
180 | MODULE_LICENSE("GPL"); | |
181 | MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>"); | |
182 | MODULE_DESCRIPTION("Simulated MTD driver for testing"); |