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
, void **virt
, resource_size_t
*phys
)
45 struct map_info
*map
= mtd
->priv
;
46 *virt
= map
->virt
+ from
;
48 *phys
= map
->phys
+ from
;
53 /****************************************************************************/
55 int __init
uclinux_mtd_init(void)
58 struct map_info
*mapp
;
60 unsigned long addr
= (unsigned long) &_ebss
;
62 mapp
= &uclinux_ram_map
;
64 mapp
->size
= PAGE_ALIGN(ntohl(*((unsigned long *)(addr
+ 8))));
67 printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
68 (int) mapp
->phys
, (int) mapp
->size
);
70 mapp
->virt
= ioremap_nocache(mapp
->phys
, mapp
->size
);
72 if (mapp
->virt
== 0) {
73 printk("uclinux[mtd]: ioremap_nocache() failed\n");
77 simple_map_init(mapp
);
79 mtd
= do_map_probe("map_ram", mapp
);
81 printk("uclinux[mtd]: failed to find a mapping?\n");
86 mtd
->owner
= THIS_MODULE
;
87 mtd
->point
= uclinux_point
;
90 uclinux_ram_mtdinfo
= mtd
;
91 add_mtd_partitions(mtd
, uclinux_romfs
, NUM_PARTITIONS
);
96 /****************************************************************************/
98 void __exit
uclinux_mtd_cleanup(void)
100 if (uclinux_ram_mtdinfo
) {
101 del_mtd_partitions(uclinux_ram_mtdinfo
);
102 map_destroy(uclinux_ram_mtdinfo
);
103 uclinux_ram_mtdinfo
= NULL
;
105 if (uclinux_ram_map
.virt
) {
106 iounmap((void *) uclinux_ram_map
.virt
);
107 uclinux_ram_map
.virt
= 0;
111 /****************************************************************************/
113 module_init(uclinux_mtd_init
);
114 module_exit(uclinux_mtd_cleanup
);
116 MODULE_LICENSE("GPL");
117 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
118 MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
120 /****************************************************************************/