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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
9/****************************************************************************/
10
11#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/mm.h>
17#include <linux/major.h>
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/map.h>
20#include <linux/mtd/partitions.h>
21#include <asm/io.h>
22#include <asm/sections.h>
23
24/****************************************************************************/
25
26struct map_info uclinux_ram_map = {
27 .name = "RAM",
28 .phys = (unsigned long)__bss_stop,
29 .size = 0,
30};
31
32static struct mtd_info *uclinux_ram_mtdinfo;
33
34/****************************************************************************/
35
36static struct mtd_partition uclinux_romfs[] = {
37 { .name = "ROMfs" }
38};
39
40#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
41
42/****************************************************************************/
43
44static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
45 size_t *retlen, void **virt, resource_size_t *phys)
46{
47 struct map_info *map = mtd->priv;
48 *virt = map->virt + from;
49 if (phys)
50 *phys = map->phys + from;
51 *retlen = len;
52 return(0);
53}
54
55/****************************************************************************/
56
57static int __init uclinux_mtd_init(void)
58{
59 struct mtd_info *mtd;
60 struct map_info *mapp;
61
62 mapp = &uclinux_ram_map;
63 if (!mapp->size)
64 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
65 mapp->bankwidth = 4;
66
67 printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
68 (int) mapp->phys, (int) mapp->size);
69
70 mapp->virt = ioremap_nocache(mapp->phys, mapp->size);
71
72 if (mapp->virt == 0) {
73 printk("uclinux[mtd]: ioremap_nocache() failed\n");
74 return(-EIO);
75 }
76
77 simple_map_init(mapp);
78
79 mtd = do_map_probe("map_ram", mapp);
80 if (!mtd) {
81 printk("uclinux[mtd]: failed to find a mapping?\n");
82 iounmap(mapp->virt);
83 return(-ENXIO);
84 }
85
86 mtd->owner = THIS_MODULE;
87 mtd->_point = uclinux_point;
88 mtd->priv = mapp;
89
90 uclinux_ram_mtdinfo = mtd;
91 mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
92
93 return(0);
94}
95
96/****************************************************************************/
97
98static void __exit uclinux_mtd_cleanup(void)
99{
100 if (uclinux_ram_mtdinfo) {
101 mtd_device_unregister(uclinux_ram_mtdinfo);
102 map_destroy(uclinux_ram_mtdinfo);
103 uclinux_ram_mtdinfo = NULL;
104 }
105 if (uclinux_ram_map.virt) {
106 iounmap((void *) uclinux_ram_map.virt);
107 uclinux_ram_map.virt = 0;
108 }
109}
110
111/****************************************************************************/
112
113module_init(uclinux_mtd_init);
114module_exit(uclinux_mtd_cleanup);
115
116MODULE_LICENSE("GPL");
117MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
118MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
119
120/****************************************************************************/