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 static 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 static 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 /****************************************************************************/