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>
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_param(total_size,ulong,0);
33 MODULE_PARM_DESC(total_size, "Total device size in KiB");
34 module_param(erase_size,ulong,0);
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;
60 mtd_erase_callback(instr);
65 static int ram_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf)
67 if (from + len > mtd->size)
70 *mtdbuf = mtd->priv + from;
75 static void ram_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from,
78 DEBUG(MTD_DEBUG_LEVEL2, "ram_unpoint\n");
81 static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
82 size_t *retlen, u_char *buf)
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);
90 memcpy(buf, mtd->priv + from, len);
96 static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
97 size_t *retlen, const u_char *buf)
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);
105 memcpy ((char *)mtd->priv + to, buf, len);
111 static void __exit cleanup_mtdram(void)
114 del_mtd_device(mtd_info);
115 #if CONFIG_MTDRAM_TOTAL_SIZE > 0
117 #if CONFIG_MTDRAM_ABS_POS > 0
118 iounmap(mtd_info->priv);
120 vfree(mtd_info->priv);
127 int mtdram_init_device(struct mtd_info *mtd, void *mapped_address,
128 unsigned long size, char *name)
130 memset(mtd, 0, sizeof(*mtd));
132 /* Setup the MTD structure */
135 mtd->flags = MTD_CAP_RAM;
137 mtd->erasesize = MTDRAM_ERASE_SIZE;
138 mtd->priv = mapped_address;
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;
147 if (add_mtd_device(mtd)) {
154 #if CONFIG_MTDRAM_TOTAL_SIZE > 0
155 #if CONFIG_MTDRAM_ABS_POS > 0
156 static int __init init_mtdram(void)
160 /* Allocate some memory */
161 mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
165 addr = ioremap(CONFIG_MTDRAM_ABS_POS, MTDRAM_TOTAL_SIZE);
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);
174 err = mtdram_init_device(mtd_info, addr,
175 MTDRAM_TOTAL_SIZE, "mtdram test device");
183 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
187 #else /* CONFIG_MTDRAM_ABS_POS > 0 */
189 static int __init init_mtdram(void)
193 /* Allocate some memory */
194 mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
198 addr = vmalloc(MTDRAM_TOTAL_SIZE);
200 DEBUG(MTD_DEBUG_LEVEL1,
201 "Failed to vmalloc memory region of size %ld\n",
202 (long)MTDRAM_TOTAL_SIZE);
207 err = mtdram_init_device(mtd_info, addr,
208 MTDRAM_TOTAL_SIZE, "mtdram test device");
216 memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
219 #endif /* !(CONFIG_MTDRAM_ABS_POS > 0) */
221 #else /* CONFIG_MTDRAM_TOTAL_SIZE > 0 */
223 static int __init init_mtdram(void)
227 #endif /* !(CONFIG_MTDRAM_TOTAL_SIZE > 0) */
229 module_init(init_mtdram);
230 module_exit(cleanup_mtdram);
232 MODULE_LICENSE("GPL");
233 MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>");
234 MODULE_DESCRIPTION("Simulated MTD driver for testing");