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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 * License: GPL
9 */
10
11/****************************************************************************/
12
13#include <linux/moduleparam.h>
14#include <linux/types.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/fs.h>
18#include <linux/mm.h>
19#include <linux/major.h>
20#include <linux/mtd/mtd.h>
21#include <linux/mtd/map.h>
22#include <linux/mtd/partitions.h>
23#include <asm/io.h>
24#include <asm/sections.h>
25
26/****************************************************************************/
27
28#ifdef CONFIG_MTD_ROM
29#define MAP_NAME "rom"
30#else
31#define MAP_NAME "ram"
32#endif
33
34static struct map_info uclinux_ram_map = {
35 .name = MAP_NAME,
36 .size = 0,
37};
38
39static unsigned long physaddr = -1;
40module_param(physaddr, ulong, S_IRUGO);
41
42static struct mtd_info *uclinux_ram_mtdinfo;
43
44/****************************************************************************/
45
46static const struct mtd_partition uclinux_romfs[] = {
47 { .name = "ROMfs" }
48};
49
50#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
51
52/****************************************************************************/
53
54static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
55 size_t *retlen, void **virt, resource_size_t *phys)
56{
57 struct map_info *map = mtd->priv;
58 *virt = map->virt + from;
59 if (phys)
60 *phys = map->phys + from;
61 *retlen = len;
62 return(0);
63}
64
65/****************************************************************************/
66
67static int __init uclinux_mtd_init(void)
68{
69 struct mtd_info *mtd;
70 struct map_info *mapp;
71
72 mapp = &uclinux_ram_map;
73
74 if (physaddr == -1)
75 mapp->phys = (resource_size_t)__bss_stop;
76 else
77 mapp->phys = physaddr;
78
79 if (!mapp->size)
80 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
81 mapp->bankwidth = 4;
82
83 printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
84 (int) mapp->phys, (int) mapp->size);
85
86 /*
87 * The filesystem is guaranteed to be in direct mapped memory. It is
88 * directly following the kernels own bss region. Following the same
89 * mechanism used by architectures setting up traditional initrds we
90 * use phys_to_virt to get the virtual address of its start.
91 */
92 mapp->virt = phys_to_virt(mapp->phys);
93
94 if (mapp->virt == 0) {
95 printk("uclinux[mtd]: no virtual mapping?\n");
96 return(-EIO);
97 }
98
99 simple_map_init(mapp);
100
101 mtd = do_map_probe("map_" MAP_NAME, mapp);
102 if (!mtd) {
103 printk("uclinux[mtd]: failed to find a mapping?\n");
104 return(-ENXIO);
105 }
106
107 mtd->owner = THIS_MODULE;
108 mtd->_point = uclinux_point;
109 mtd->priv = mapp;
110
111 uclinux_ram_mtdinfo = mtd;
112 mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
113
114 return(0);
115}
116device_initcall(uclinux_mtd_init);
117
118/****************************************************************************/
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 * License: GPL
9 */
10
11/****************************************************************************/
12
13#include <linux/moduleparam.h>
14#include <linux/types.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/fs.h>
18#include <linux/mm.h>
19#include <linux/major.h>
20#include <linux/mtd/mtd.h>
21#include <linux/mtd/map.h>
22#include <linux/mtd/partitions.h>
23#include <asm/io.h>
24#include <asm/sections.h>
25
26/****************************************************************************/
27
28#ifdef CONFIG_MTD_ROM
29#define MAP_NAME "rom"
30#else
31#define MAP_NAME "ram"
32#endif
33
34static struct map_info uclinux_ram_map = {
35 .name = MAP_NAME,
36 .size = 0,
37};
38
39static unsigned long physaddr = -1;
40module_param(physaddr, ulong, S_IRUGO);
41
42static struct mtd_info *uclinux_ram_mtdinfo;
43
44/****************************************************************************/
45
46static const struct mtd_partition uclinux_romfs[] = {
47 { .name = "ROMfs" }
48};
49
50#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
51
52/****************************************************************************/
53
54static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
55 size_t *retlen, void **virt, resource_size_t *phys)
56{
57 struct map_info *map = mtd->priv;
58 *virt = map->virt + from;
59 if (phys)
60 *phys = map->phys + from;
61 *retlen = len;
62 return(0);
63}
64
65/****************************************************************************/
66
67static int __init uclinux_mtd_init(void)
68{
69 struct mtd_info *mtd;
70 struct map_info *mapp;
71
72 mapp = &uclinux_ram_map;
73
74 if (physaddr == -1)
75 mapp->phys = (resource_size_t)__bss_stop;
76 else
77 mapp->phys = physaddr;
78
79 if (!mapp->size)
80 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
81 mapp->bankwidth = 4;
82
83 printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
84 (int) mapp->phys, (int) mapp->size);
85
86 /*
87 * The filesystem is guaranteed to be in direct mapped memory. It is
88 * directly following the kernels own bss region. Following the same
89 * mechanism used by architectures setting up traditional initrds we
90 * use phys_to_virt to get the virtual address of its start.
91 */
92 mapp->virt = phys_to_virt(mapp->phys);
93
94 if (mapp->virt == 0) {
95 printk("uclinux[mtd]: no virtual mapping?\n");
96 return(-EIO);
97 }
98
99 simple_map_init(mapp);
100
101 mtd = do_map_probe("map_" MAP_NAME, mapp);
102 if (!mtd) {
103 printk("uclinux[mtd]: failed to find a mapping?\n");
104 return(-ENXIO);
105 }
106
107 mtd->owner = THIS_MODULE;
108 mtd->_point = uclinux_point;
109 mtd->priv = mapp;
110
111 uclinux_ram_mtdinfo = mtd;
112 mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
113
114 return(0);
115}
116device_initcall(uclinux_mtd_init);
117
118/****************************************************************************/