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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 * 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
34/*
35 * Blackfin uses uclinux_ram_map during startup, so it must not be static.
36 * Provide a dummy declaration to make sparse happy.
37 */
38extern struct map_info uclinux_ram_map;
39
40struct map_info uclinux_ram_map = {
41 .name = MAP_NAME,
42 .size = 0,
43};
44
45static unsigned long physaddr = -1;
46module_param(physaddr, ulong, S_IRUGO);
47
48static struct mtd_info *uclinux_ram_mtdinfo;
49
50/****************************************************************************/
51
52static struct mtd_partition uclinux_romfs[] = {
53 { .name = "ROMfs" }
54};
55
56#define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs)
57
58/****************************************************************************/
59
60static int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len,
61 size_t *retlen, void **virt, resource_size_t *phys)
62{
63 struct map_info *map = mtd->priv;
64 *virt = map->virt + from;
65 if (phys)
66 *phys = map->phys + from;
67 *retlen = len;
68 return(0);
69}
70
71/****************************************************************************/
72
73static int __init uclinux_mtd_init(void)
74{
75 struct mtd_info *mtd;
76 struct map_info *mapp;
77
78 mapp = &uclinux_ram_map;
79
80 if (physaddr == -1)
81 mapp->phys = (resource_size_t)__bss_stop;
82 else
83 mapp->phys = physaddr;
84
85 if (!mapp->size)
86 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(mapp->phys + 8))));
87 mapp->bankwidth = 4;
88
89 printk("uclinux[mtd]: probe address=0x%x size=0x%x\n",
90 (int) mapp->phys, (int) mapp->size);
91
92 /*
93 * The filesystem is guaranteed to be in direct mapped memory. It is
94 * directly following the kernels own bss region. Following the same
95 * mechanism used by architectures setting up traditional initrds we
96 * use phys_to_virt to get the virtual address of its start.
97 */
98 mapp->virt = phys_to_virt(mapp->phys);
99
100 if (mapp->virt == 0) {
101 printk("uclinux[mtd]: no virtual mapping?\n");
102 return(-EIO);
103 }
104
105 simple_map_init(mapp);
106
107 mtd = do_map_probe("map_" MAP_NAME, mapp);
108 if (!mtd) {
109 printk("uclinux[mtd]: failed to find a mapping?\n");
110 return(-ENXIO);
111 }
112
113 mtd->owner = THIS_MODULE;
114 mtd->_point = uclinux_point;
115 mtd->priv = mapp;
116
117 uclinux_ram_mtdinfo = mtd;
118 mtd_device_register(mtd, uclinux_romfs, NUM_PARTITIONS);
119
120 return(0);
121}
122device_initcall(uclinux_mtd_init);
123
124/****************************************************************************/