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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mtd/devices/mtdram.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/mtd/devices/mtdram.c')
-rw-r--r--drivers/mtd/devices/mtdram.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/drivers/mtd/devices/mtdram.c b/drivers/mtd/devices/mtdram.c
new file mode 100644
index 000000000000..edac4156d69c
--- /dev/null
+++ b/drivers/mtd/devices/mtdram.c
@@ -0,0 +1,235 @@
1/*
2 * mtdram - a test mtd device
3 * $Id: mtdram.c,v 1.35 2005/01/05 18:05:12 dwmw2 Exp $
4 * Author: Alexander Larsson <alex@cendio.se>
5 *
6 * Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
7 *
8 * This code is GPL
9 *
10 */
11
12#include <linux/config.h>
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/ioport.h>
16#include <linux/vmalloc.h>
17#include <linux/init.h>
18#include <linux/mtd/compatmac.h>
19#include <linux/mtd/mtd.h>
20
21#ifndef CONFIG_MTDRAM_ABS_POS
22 #define CONFIG_MTDRAM_ABS_POS 0
23#endif
24
25#if CONFIG_MTDRAM_ABS_POS > 0
26 #include <asm/io.h>
27#endif
28
29#ifdef MODULE
30static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
31static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
32module_param(total_size,ulong,0);
33MODULE_PARM_DESC(total_size, "Total device size in KiB");
34module_param(erase_size,ulong,0);
35MODULE_PARM_DESC(erase_size, "Device erase block size in KiB");
36#define MTDRAM_TOTAL_SIZE (total_size * 1024)
37#define MTDRAM_ERASE_SIZE (erase_size * 1024)
38#else
39#define MTDRAM_TOTAL_SIZE (CONFIG_MTDRAM_TOTAL_SIZE * 1024)
40#define MTDRAM_ERASE_SIZE (CONFIG_MTDRAM_ERASE_SIZE * 1024)
41#endif
42
43
44// We could store these in the mtd structure, but we only support 1 device..
45static struct mtd_info *mtd_info;
46
47
48static int
49ram_erase(struct mtd_info *mtd, struct erase_info *instr)
50{
51 DEBUG(MTD_DEBUG_LEVEL2, "ram_erase(pos:%ld, len:%ld)\n", (long)instr->addr, (long)instr->len);
52 if (instr->addr + instr->len > mtd->size) {
53 DEBUG(MTD_DEBUG_LEVEL1, "ram_erase() out of bounds (%ld > %ld)\n", (long)(instr->addr + instr->len), (long)mtd->size);
54 return -EINVAL;
55 }
56
57 memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
58
59 instr->state = MTD_ERASE_DONE;
60 mtd_erase_callback(instr);
61
62 return 0;
63}
64
65static int ram_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf)
66{
67 if (from + len > mtd->size)
68 return -EINVAL;
69
70 *mtdbuf = mtd->priv + from;
71 *retlen = len;
72 return 0;
73}
74
75static void ram_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from,
76 size_t len)
77{
78 DEBUG(MTD_DEBUG_LEVEL2, "ram_unpoint\n");
79}
80
81static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
82 size_t *retlen, u_char *buf)
83{
84 DEBUG(MTD_DEBUG_LEVEL2, "ram_read(pos:%ld, len:%ld)\n", (long)from, (long)len);
85 if (from + len > mtd->size) {
86 DEBUG(MTD_DEBUG_LEVEL1, "ram_read() out of bounds (%ld > %ld)\n", (long)(from + len), (long)mtd->size);
87 return -EINVAL;
88 }
89
90 memcpy(buf, mtd->priv + from, len);
91
92 *retlen=len;
93 return 0;
94}
95
96static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
97 size_t *retlen, const u_char *buf)
98{
99 DEBUG(MTD_DEBUG_LEVEL2, "ram_write(pos:%ld, len:%ld)\n", (long)to, (long)len);
100 if (to + len > mtd->size) {
101 DEBUG(MTD_DEBUG_LEVEL1, "ram_write() out of bounds (%ld > %ld)\n", (long)(to + len), (long)mtd->size);
102 return -EINVAL;
103 }
104
105 memcpy ((char *)mtd->priv + to, buf, len);
106
107 *retlen=len;
108 return 0;
109}
110
111static void __exit cleanup_mtdram(void)
112{
113 if (mtd_info) {
114 del_mtd_device(mtd_info);
115#if CONFIG_MTDRAM_TOTAL_SIZE > 0
116 if (mtd_info->priv)
117#if CONFIG_MTDRAM_ABS_POS > 0
118 iounmap(mtd_info->priv);
119#else
120 vfree(mtd_info->priv);
121#endif
122#endif
123 kfree(mtd_info);
124 }
125}
126
127int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
128 unsigned long size, char *name)
129{
130 memset(mtd, 0, sizeof(*mtd));
131
132 /* Setup the MTD structure */
133 mtd->name = name;
134 mtd->type = MTD_RAM;
135 mtd->flags = MTD_CAP_RAM;
136 mtd->size = size;
137 mtd->erasesize = MTDRAM_ERASE_SIZE;
138 mtd->priv = mapped_address;
139
140 mtd->owner = THIS_MODULE;
141 mtd->erase = ram_erase;
142 mtd->point = ram_point;
143 mtd->unpoint = ram_unpoint;
144 mtd->read = ram_read;
145 mtd->write = ram_write;
146
147 if (add_mtd_device(mtd)) {
148 return -EIO;
149 }
150
151 return 0;
152}
153
154#if CONFIG_MTDRAM_TOTAL_SIZE > 0
155#if CONFIG_MTDRAM_ABS_POS > 0
156static int __init init_mtdram(void)
157{
158 void *addr;
159 int err;
160 /* Allocate some memory */
161 mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
162 if (!mtd_info)
163 return -ENOMEM;
164
165 addr = ioremap(CONFIG_MTDRAM_ABS_POS, MTDRAM_TOTAL_SIZE);
166 if (!addr) {
167 DEBUG(MTD_DEBUG_LEVEL1,
168 "Failed to ioremap) memory region of size %ld at ABS_POS:%ld\n",
169 (long)MTDRAM_TOTAL_SIZE, (long)CONFIG_MTDRAM_ABS_POS);
170 kfree(mtd_info);
171 mtd_info = NULL;
172 return -ENOMEM;
173 }
174 err = mtdram_init_device(mtd_info, addr,
175 MTDRAM_TOTAL_SIZE, "mtdram test device");
176 if (err)
177 {
178 iounmap(addr);
179 kfree(mtd_info);
180 mtd_info = NULL;
181 return err;
182 }
183 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
184 return err;
185}
186
187#else /* CONFIG_MTDRAM_ABS_POS > 0 */
188
189static int __init init_mtdram(void)
190{
191 void *addr;
192 int err;
193 /* Allocate some memory */
194 mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
195 if (!mtd_info)
196 return -ENOMEM;
197
198 addr = vmalloc(MTDRAM_TOTAL_SIZE);
199 if (!addr) {
200 DEBUG(MTD_DEBUG_LEVEL1,
201 "Failed to vmalloc memory region of size %ld\n",
202 (long)MTDRAM_TOTAL_SIZE);
203 kfree(mtd_info);
204 mtd_info = NULL;
205 return -ENOMEM;
206 }
207 err = mtdram_init_device(mtd_info, addr,
208 MTDRAM_TOTAL_SIZE, "mtdram test device");
209 if (err)
210 {
211 vfree(addr);
212 kfree(mtd_info);
213 mtd_info = NULL;
214 return err;
215 }
216 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
217 return err;
218}
219#endif /* !(CONFIG_MTDRAM_ABS_POS > 0) */
220
221#else /* CONFIG_MTDRAM_TOTAL_SIZE > 0 */
222
223static int __init init_mtdram(void)
224{
225 return 0;
226}
227#endif /* !(CONFIG_MTDRAM_TOTAL_SIZE > 0) */
228
229module_init(init_mtdram);
230module_exit(cleanup_mtdram);
231
232MODULE_LICENSE("GPL");
233MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
234MODULE_DESCRIPTION("Simulated MTD driver for testing");
235