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path: root/drivers/mtd/maps/uclinux.c
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Diffstat (limited to 'drivers/mtd/maps/uclinux.c')
-rw-r--r--drivers/mtd/maps/uclinux.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/mtd/maps/uclinux.c b/drivers/mtd/maps/uclinux.c
new file mode 100644
index 000000000000..811d92e5f5b1
--- /dev/null
+++ b/drivers/mtd/maps/uclinux.c
@@ -0,0 +1,127 @@
1/****************************************************************************/
2
3/*
4 * uclinux.c -- generic memory mapped MTD driver for uclinux
5 *
6 * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com)
7 *
8 * $Id: uclinux.c,v 1.10 2005/01/05 18:05:13 dwmw2 Exp $
9 */
10
11/****************************************************************************/
12
13#include <linux/config.h>
14#include <linux/module.h>
15#include <linux/types.h>
16#include <linux/init.h>
17#include <linux/kernel.h>
18#include <linux/fs.h>
19#include <linux/major.h>
20#include <linux/root_dev.h>
21#include <linux/mtd/mtd.h>
22#include <linux/mtd/map.h>
23#include <linux/mtd/partitions.h>
24#include <asm/io.h>
25
26/****************************************************************************/
27
28
29/****************************************************************************/
30
31struct map_info uclinux_ram_map = {
32 .name = "RAM",
33};
34
35struct mtd_info *uclinux_ram_mtdinfo;
36
37/****************************************************************************/
38
39struct mtd_partition uclinux_romfs[] = {
40 { .name = "ROMfs" }
41};
42
43#define NUM_PARTITIONS (sizeof(uclinux_romfs) / sizeof(uclinux_romfs[0]))
44
45/****************************************************************************/
46
47int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
48 size_t *retlen, u_char **mtdbuf)
49{
50 struct map_info *map = mtd->priv;
51 *mtdbuf = (u_char *) (map->virt + ((int) from));
52 *retlen = len;
53 return(0);
54}
55
56/****************************************************************************/
57
58int __init uclinux_mtd_init(void)
59{
60 struct mtd_info *mtd;
61 struct map_info *mapp;
62 extern char _ebss;
63
64 mapp = &uclinux_ram_map;
65 mapp->phys = (unsigned long) &_ebss;
66 mapp->size = PAGE_ALIGN(*((unsigned long *)((&_ebss) + 8)));
67 mapp->bankwidth = 4;
68
69 printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
70 (int) mapp->map_priv_2, (int) mapp->size);
71
72 mapp->virt = ioremap_nocache(mapp->phys, mapp->size);
73
74 if (mapp->virt == 0) {
75 printk("uclinux[mtd]: ioremap_nocache() failed\n");
76 return(-EIO);
77 }
78
79 simple_map_init(mapp);
80
81 mtd = do_map_probe("map_ram", mapp);
82 if (!mtd) {
83 printk("uclinux[mtd]: failed to find a mapping?\n");
84 iounmap(mapp->virt);
85 return(-ENXIO);
86 }
87
88 mtd->owner = THIS_MODULE;
89 mtd->point = uclinux_point;
90 mtd->priv = mapp;
91
92 uclinux_ram_mtdinfo = mtd;
93 add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS);
94
95 printk("uclinux[mtd]: set %s to be root filesystem\n",
96 uclinux_romfs[0].name);
97 ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, 0);
98 put_mtd_device(mtd);
99
100 return(0);
101}
102
103/****************************************************************************/
104
105void __exit uclinux_mtd_cleanup(void)
106{
107 if (uclinux_ram_mtdinfo) {
108 del_mtd_partitions(uclinux_ram_mtdinfo);
109 map_destroy(uclinux_ram_mtdinfo);
110 uclinux_ram_mtdinfo = NULL;
111 }
112 if (uclinux_ram_map.map_priv_1) {
113 iounmap((void *) uclinux_ram_map.virt);
114 uclinux_ram_map.virt = 0;
115 }
116}
117
118/****************************************************************************/
119
120module_init(uclinux_mtd_init);
121module_exit(uclinux_mtd_cleanup);
122
123MODULE_LICENSE("GPL");
124MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
125MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
126
127/****************************************************************************/