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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
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
23/****************************************************************************/
24
25extern char _ebss;
26
27struct map_info uclinux_ram_map = {
28 .name = "RAM",
29 .phys = (unsigned long)&_ebss,
30 .size = 0,
31};
32
33static struct mtd_info *uclinux_ram_mtdinfo;
34
35/****************************************************************************/
36
37static struct mtd_partition uclinux_romfs[] = {
38 { .name = "ROMfs" }
39};
40
41#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
42
43/****************************************************************************/
44
45static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
46 size_t *retlen, void **virt, resource_size_t *phys)
47{
48 struct map_info *map = mtd->priv;
49 *virt = map->virt + from;
50 if (phys)
51 *phys = map->phys + from;
52 *retlen = len;
53 return(0);
54}
55
56/****************************************************************************/
57
58static int __init uclinux_mtd_init(void)
59{
60 struct mtd_info *mtd;
61 struct map_info *mapp;
62
63 mapp = &uclinux_ram_map;
64 if (!mapp->size)
65 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
66 mapp->bankwidth = 4;
67
68 printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n",
69 (int) mapp->phys, (int) mapp->size);
70
71 mapp->virt = ioremap_nocache(mapp->phys, mapp->size);
72
73 if (mapp->virt == 0) {
74 printk("uclinux[mtd]: ioremap_nocache() failed\n");
75 return(-EIO);
76 }
77
78 simple_map_init(mapp);
79
80 mtd = do_map_probe("map_ram", mapp);
81 if (!mtd) {
82 printk("uclinux[mtd]: failed to find a mapping?\n");
83 iounmap(mapp->virt);
84 return(-ENXIO);
85 }
86
87 mtd->owner = THIS_MODULE;
88 mtd->point = uclinux_point;
89 mtd->priv = mapp;
90
91 uclinux_ram_mtdinfo = mtd;
92 mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
93
94 return(0);
95}
96
97/****************************************************************************/
98
99static void __exit uclinux_mtd_cleanup(void)
100{
101 if (uclinux_ram_mtdinfo) {
102 mtd_device_unregister(uclinux_ram_mtdinfo);
103 map_destroy(uclinux_ram_mtdinfo);
104 uclinux_ram_mtdinfo = NULL;
105 }
106 if (uclinux_ram_map.virt) {
107 iounmap((void *) uclinux_ram_map.virt);
108 uclinux_ram_map.virt = 0;
109 }
110}
111
112/****************************************************************************/
113
114module_init(uclinux_mtd_init);
115module_exit(uclinux_mtd_cleanup);
116
117MODULE_LICENSE("GPL");
118MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
119MODULE_DESCRIPTION("Generic RAM based MTD for uClinux");
120
121/****************************************************************************/
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
26#ifdef CONFIG_MTD_ROM
27#define MAP_NAME "rom"
28#else
29#define MAP_NAME "ram"
30#endif
31
32/*
33 * Blackfin uses uclinux_ram_map during startup, so it must not be static.
34 * Provide a dummy declaration to make sparse happy.
35 */
36extern struct map_info uclinux_ram_map;
37
38struct map_info uclinux_ram_map = {
39 .name = MAP_NAME,
40 .size = 0,
41};
42
43static unsigned long physaddr = -1;
44module_param(physaddr, ulong, S_IRUGO);
45
46static struct mtd_info *uclinux_ram_mtdinfo;
47
48/****************************************************************************/
49
50static struct mtd_partition uclinux_romfs[] = {
51 { .name = "ROMfs" }
52};
53
54#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
55
56/****************************************************************************/
57
58static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
59 size_t *retlen, void **virt, resource_size_t *phys)
60{
61 struct map_info *map = mtd->priv;
62 *virt = map->virt + from;
63 if (phys)
64 *phys = map->phys + from;
65 *retlen = len;
66 return(0);
67}
68
69/****************************************************************************/
70
71static int __init uclinux_mtd_init(void)
72{
73 struct mtd_info *mtd;
74 struct map_info *mapp;
75
76 mapp = &uclinux_ram_map;
77
78 if (physaddr == -1)
79 mapp->phys = (resource_size_t)__bss_stop;
80 else
81 mapp->phys = physaddr;
82
83 if (!mapp->size)
84 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
85 mapp->bankwidth = 4;
86
87 printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
88 (int) mapp->phys, (int) mapp->size);
89
90 /*
91 * The filesystem is guaranteed to be in direct mapped memory. It is
92 * directly following the kernels own bss region. Following the same
93 * mechanism used by architectures setting up traditional initrds we
94 * use phys_to_virt to get the virtual address of its start.
95 */
96 mapp->virt = phys_to_virt(mapp->phys);
97
98 if (mapp->virt == 0) {
99 printk("uclinux[mtd]: no virtual mapping?\n");
100 return(-EIO);
101 }
102
103 simple_map_init(mapp);
104
105 mtd = do_map_probe("map_" MAP_NAME, mapp);
106 if (!mtd) {
107 printk("uclinux[mtd]: failed to find a mapping?\n");
108 return(-ENXIO);
109 }
110
111 mtd->owner = THIS_MODULE;
112 mtd->_point = uclinux_point;
113 mtd->priv = mapp;
114
115 uclinux_ram_mtdinfo = mtd;
116 mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
117
118 return(0);
119}
120
121/****************************************************************************/
122
123static void __exit uclinux_mtd_cleanup(void)
124{
125 if (uclinux_ram_mtdinfo) {
126 mtd_device_unregister(uclinux_ram_mtdinfo);
127 map_destroy(uclinux_ram_mtdinfo);
128 uclinux_ram_mtdinfo = NULL;
129 }
130 if (uclinux_ram_map.virt)
131 uclinux_ram_map.virt = 0;
132}
133
134/****************************************************************************/
135
136module_init(uclinux_mtd_init);
137module_exit(uclinux_mtd_cleanup);
138
139MODULE_LICENSE("GPL");
140MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
141MODULE_DESCRIPTION("Generic MTD for uClinux");
142
143/****************************************************************************/