2 * mtdram - a test mtd device
3 * $Id: mtdram.c,v 1.32 2003/05/21 15:15:07 dwmw2 Exp $
4 * Author: Alexander Larsson <alex@cendio.se>
6 * Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
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>
21 #ifndef CONFIG_MTDRAM_ABS_POS
22 #define CONFIG_MTDRAM_ABS_POS 0
25 #if CONFIG_MTDRAM_ABS_POS > 0
30 static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE;
31 static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE;
32 MODULE_PARM(total_size,"l");
33 MODULE_PARM_DESC(total_size, "Total device size in KiB");
34 MODULE_PARM(erase_size,"l");
35 MODULE_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)
39 #define MTDRAM_TOTAL_SIZE (CONFIG_MTDRAM_TOTAL_SIZE * 1024)
40 #define MTDRAM_ERASE_SIZE (CONFIG_MTDRAM_ERASE_SIZE * 1024)
44 // We could store these in the mtd structure, but we only support 1 device..
45 static struct mtd_info *mtd_info;
49 ram_erase(struct mtd_info *mtd, struct erase_info *instr)
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);
57 memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
59 instr->state = MTD_ERASE_DONE;
62 (*(instr->callback))(instr);
66 static int ram_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf)
68 if (from + len > mtd->size)
71 *mtdbuf = mtd->priv + from;
76 static void ram_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from,
79 DEBUG(MTD_DEBUG_LEVEL2, "ram_unpoint\n");
82 static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
83 size_t *retlen, u_char *buf)
85 DEBUG(MTD_DEBUG_LEVEL2, "ram_read(pos:%ld, len:%ld)\n", (long)from, (long)len);
86 if (from + len > mtd->size) {
87 DEBUG(MTD_DEBUG_LEVEL1, "ram_read() out of bounds (%ld > %ld)\n", (long)(from + len), (long)mtd->size);
91 memcpy(buf, mtd->priv + from, len);
97 static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
98 size_t *retlen, const u_char *buf)
100 DEBUG(MTD_DEBUG_LEVEL2, "ram_write(pos:%ld, len:%ld)\n", (long)to, (long)len);
101 if (to + len > mtd->size) {
102 DEBUG(MTD_DEBUG_LEVEL1, "ram_write() out of bounds (%ld > %ld)\n", (long)(to + len), (long)mtd->size);
106 memcpy ((char *)mtd->priv + to, buf, len);
112 static void __exit cleanup_mtdram(void)
115 del_mtd_device(mtd_info);
116 #if CONFIG_MTDRAM_TOTAL_SIZE > 0
118 #if CONFIG_MTDRAM_ABS_POS > 0
119 iounmap(mtd_info->priv);
121 vfree(mtd_info->priv);
128 int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
129 unsigned long size, char *name)
131 memset(mtd, 0, sizeof(*mtd));
133 /* Setup the MTD structure */
136 mtd->flags = MTD_CAP_RAM;
138 mtd->erasesize = MTDRAM_ERASE_SIZE;
139 mtd->priv = mapped_address;
141 mtd->owner = THIS_MODULE;
142 mtd->erase = ram_erase;
143 mtd->point = ram_point;
144 mtd->unpoint = ram_unpoint;
145 mtd->read = ram_read;
146 mtd->write = ram_write;
148 if (add_mtd_device(mtd)) {
155 #if CONFIG_MTDRAM_TOTAL_SIZE > 0
156 #if CONFIG_MTDRAM_ABS_POS > 0
157 int __init init_mtdram(void)
161 /* Allocate some memory */
162 mtd_info = (struct mtd_info *)kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
166 addr = ioremap(CONFIG_MTDRAM_ABS_POS, MTDRAM_TOTAL_SIZE);
168 DEBUG(MTD_DEBUG_LEVEL1,
169 "Failed to ioremap) memory region of size %ld at ABS_POS:%ld\n",
170 (long)MTDRAM_TOTAL_SIZE, (long)CONFIG_MTDRAM_ABS_POS);
175 err = mtdram_init_device(mtd_info, addr,
176 MTDRAM_TOTAL_SIZE, "mtdram test device");
184 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
188 #else /* CONFIG_MTDRAM_ABS_POS > 0 */
190 int __init init_mtdram(void)
194 /* Allocate some memory */
195 mtd_info = (struct mtd_info *)kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
199 addr = vmalloc(MTDRAM_TOTAL_SIZE);
201 DEBUG(MTD_DEBUG_LEVEL1,
202 "Failed to vmalloc memory region of size %ld\n",
203 (long)MTDRAM_TOTAL_SIZE);
208 err = mtdram_init_device(mtd_info, addr,
209 MTDRAM_TOTAL_SIZE, "mtdram test device");
217 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
220 #endif /* !(CONFIG_MTDRAM_ABS_POS > 0) */
222 #else /* CONFIG_MTDRAM_TOTAL_SIZE > 0 */
224 int __init init_mtdram(void)
228 #endif /* !(CONFIG_MTDRAM_TOTAL_SIZE > 0) */
230 module_init(init_mtdram);
231 module_exit(cleanup_mtdram);
233 MODULE_LICENSE("GPL");
234 MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
235 MODULE_DESCRIPTION("Simulated MTD driver for testing");