1 /****************************************************************************/
4 * uclinux.c -- generic memory mapped MTD driver for uclinux
6 * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
8 * $Id: uclinux.c,v 1.12 2005/11/07 11:14:29 gleixner Exp $
11 /****************************************************************************/
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/init.h>
16 #include <linux/kernel.h>
18 #include <linux/major.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/mtd/map.h>
21 #include <linux/mtd/partitions.h>
24 /****************************************************************************/
26 struct map_info uclinux_ram_map = {
30 struct mtd_info *uclinux_ram_mtdinfo;
32 /****************************************************************************/
34 struct mtd_partition uclinux_romfs[] = {
38 #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
40 /****************************************************************************/
42 int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
43 size_t *retlen, u_char **mtdbuf)
45 struct map_info *map = mtd->priv;
46 *mtdbuf = (u_char *) (map->virt + ((int) from));
51 /****************************************************************************/
53 int __init uclinux_mtd_init(void)
56 struct map_info *mapp;
58 unsigned long addr = (unsigned long) &_ebss;
60 mapp = &uclinux_ram_map;
62 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8))));
65 printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
66 (int) mapp->phys, (int) mapp->size);
68 mapp->virt = ioremap_nocache(mapp->phys, mapp->size);
70 if (mapp->virt == 0) {
71 printk("uclinux[mtd]: ioremap_nocache() failed\n");
75 simple_map_init(mapp);
77 mtd = do_map_probe("map_ram", mapp);
79 printk("uclinux[mtd]: failed to find a mapping?\n");
84 mtd->owner = THIS_MODULE;
85 mtd->point = uclinux_point;
88 uclinux_ram_mtdinfo = mtd;
89 add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS);
94 /****************************************************************************/
96 void __exit uclinux_mtd_cleanup(void)
98 if (uclinux_ram_mtdinfo) {
99 del_mtd_partitions(uclinux_ram_mtdinfo);
100 map_destroy(uclinux_ram_mtdinfo);
101 uclinux_ram_mtdinfo = NULL;
103 if (uclinux_ram_map.virt) {
104 iounmap((void *) uclinux_ram_map.virt);
105 uclinux_ram_map.virt = 0;
109 /****************************************************************************/
111 module_init(uclinux_mtd_init);
112 module_exit(uclinux_mtd_cleanup);
114 MODULE_LICENSE("GPL");
115 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
116 MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
118 /****************************************************************************/