blob: bac000a883136e8d586afcb488a4eeca3d6328ef [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/****************************************************************************/
2
3/*
4 * uclinux.c -- generic memory mapped MTD driver for uclinux
5 *
6 * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 */
8
9/****************************************************************************/
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/init.h>
14#include <linux/kernel.h>
15#include <linux/fs.h>
16#include <linux/major.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/mtd/mtd.h>
18#include <linux/mtd/map.h>
19#include <linux/mtd/partitions.h>
20#include <asm/io.h>
21
22/****************************************************************************/
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024struct map_info uclinux_ram_map = {
25 .name = "RAM",
26};
27
28struct mtd_info *uclinux_ram_mtdinfo;
29
30/****************************************************************************/
31
32struct mtd_partition uclinux_romfs[] = {
33 { .name = "ROMfs" }
34};
35
Tobias Klauser87d10f32006-03-31 02:29:45 -080036#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38/****************************************************************************/
39
40int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
Jared Hulberta98889f2008-04-29 23:26:49 -070041 size_t *retlen, void **virt, resource_size_t *phys)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042{
43 struct map_info *map = mtd->priv;
Jared Hulberta98889f2008-04-29 23:26:49 -070044 *virt = map->virt + from;
45 if (phys)
46 *phys = map->phys + from;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 *retlen = len;
48 return(0);
49}
50
51/****************************************************************************/
52
53int __init uclinux_mtd_init(void)
54{
55 struct mtd_info *mtd;
56 struct map_info *mapp;
57 extern char _ebss;
Greg Ungererf6515db2005-09-12 11:18:10 +100058 unsigned long addr = (unsigned long) &_ebss;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60 mapp = &uclinux_ram_map;
Greg Ungererf6515db2005-09-12 11:18:10 +100061 mapp->phys = addr;
62 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8))));
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 mapp->bankwidth = 4;
64
65 printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
Greg Ungererf6515db2005-09-12 11:18:10 +100066 (int) mapp->phys, (int) mapp->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68 mapp->virt = ioremap_nocache(mapp->phys, mapp->size);
69
70 if (mapp->virt == 0) {
71 printk("uclinux[mtd]: ioremap_nocache() failed\n");
72 return(-EIO);
73 }
74
75 simple_map_init(mapp);
76
77 mtd = do_map_probe("map_ram", mapp);
78 if (!mtd) {
79 printk("uclinux[mtd]: failed to find a mapping?\n");
80 iounmap(mapp->virt);
81 return(-ENXIO);
82 }
Thomas Gleixner69f34c92005-11-07 11:15:40 +000083
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 mtd->owner = THIS_MODULE;
85 mtd->point = uclinux_point;
86 mtd->priv = mapp;
87
88 uclinux_ram_mtdinfo = mtd;
89 add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS);
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 return(0);
92}
93
94/****************************************************************************/
95
96void __exit uclinux_mtd_cleanup(void)
97{
98 if (uclinux_ram_mtdinfo) {
99 del_mtd_partitions(uclinux_ram_mtdinfo);
100 map_destroy(uclinux_ram_mtdinfo);
101 uclinux_ram_mtdinfo = NULL;
102 }
Greg Ungererf6515db2005-09-12 11:18:10 +1000103 if (uclinux_ram_map.virt) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 iounmap((void *) uclinux_ram_map.virt);
105 uclinux_ram_map.virt = 0;
106 }
107}
108
109/****************************************************************************/
110
111module_init(uclinux_mtd_init);
112module_exit(uclinux_mtd_cleanup);
113
114MODULE_LICENSE("GPL");
115MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
116MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
117
118/****************************************************************************/