1 /****************************************************************************/
4 * uclinux.c -- generic memory mapped MTD driver for uclinux
6 * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
9 /****************************************************************************/
11 #include <linux/module.h>
12 #include <linux/types.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
17 #include <linux/major.h>
18 #include <linux/mtd/mtd.h>
19 #include <linux/mtd/map.h>
20 #include <linux/mtd/partitions.h>
23 /****************************************************************************/
25 struct map_info uclinux_ram_map = {
29 struct mtd_info *uclinux_ram_mtdinfo;
31 /****************************************************************************/
33 struct mtd_partition uclinux_romfs[] = {
37 #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
39 /****************************************************************************/
41 int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
42 size_t *retlen, void **virt, resource_size_t *phys)
44 struct map_info *map = mtd->priv;
45 *virt = map->virt + from;
47 *phys = map->phys + from;
52 /****************************************************************************/
54 int __init uclinux_mtd_init(void)
57 struct map_info *mapp;
59 unsigned long addr = (unsigned long) &_ebss;
61 mapp = &uclinux_ram_map;
63 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8))));
66 printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
67 (int) mapp->phys, (int) mapp->size);
69 mapp->virt = ioremap_nocache(mapp->phys, mapp->size);
71 if (mapp->virt == 0) {
72 printk("uclinux[mtd]: ioremap_nocache() failed\n");
76 simple_map_init(mapp);
78 mtd = do_map_probe("map_ram", mapp);
80 printk("uclinux[mtd]: failed to find a mapping?\n");
85 mtd->owner = THIS_MODULE;
86 mtd->point = uclinux_point;
89 uclinux_ram_mtdinfo = mtd;
90 add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS);
95 /****************************************************************************/
97 void __exit uclinux_mtd_cleanup(void)
99 if (uclinux_ram_mtdinfo) {
100 del_mtd_partitions(uclinux_ram_mtdinfo);
101 map_destroy(uclinux_ram_mtdinfo);
102 uclinux_ram_mtdinfo = NULL;
104 if (uclinux_ram_map.virt) {
105 iounmap((void *) uclinux_ram_map.virt);
106 uclinux_ram_map.virt = 0;
110 /****************************************************************************/
112 module_init(uclinux_mtd_init);
113 module_exit(uclinux_mtd_cleanup);
115 MODULE_LICENSE("GPL");
116 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
117 MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
119 /****************************************************************************/