Linux kernel mirror (for testing)
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linux
1/*
2 * $Id: physmap.c,v 1.37 2004/11/28 09:40:40 dwmw2 Exp $
3 *
4 * Normal mappings of chips in physical memory
5 *
6 * Copyright (C) 2003 MontaVista Software Inc.
7 * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
8 *
9 * 031022 - [jsun] add run-time configure and partition setup
10 */
11
12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/slab.h>
17#include <asm/io.h>
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/map.h>
20#include <linux/config.h>
21#include <linux/mtd/partitions.h>
22
23static struct mtd_info *mymtd;
24
25struct map_info physmap_map = {
26 .name = "phys_mapped_flash",
27 .phys = CONFIG_MTD_PHYSMAP_START,
28 .size = CONFIG_MTD_PHYSMAP_LEN,
29 .bankwidth = CONFIG_MTD_PHYSMAP_BANKWIDTH,
30};
31
32#ifdef CONFIG_MTD_PARTITIONS
33static struct mtd_partition *mtd_parts;
34static int mtd_parts_nb;
35
36static int num_physmap_partitions;
37static struct mtd_partition *physmap_partitions;
38
39static const char *part_probes[] __initdata = {"cmdlinepart", "RedBoot", NULL};
40
41void physmap_set_partitions(struct mtd_partition *parts, int num_parts)
42{
43 physmap_partitions=parts;
44 num_physmap_partitions=num_parts;
45}
46#endif /* CONFIG_MTD_PARTITIONS */
47
48static int __init init_physmap(void)
49{
50 static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", "map_rom", NULL };
51 const char **type;
52
53 printk(KERN_NOTICE "physmap flash device: %lx at %lx\n", physmap_map.size, physmap_map.phys);
54 physmap_map.virt = ioremap(physmap_map.phys, physmap_map.size);
55
56 if (!physmap_map.virt) {
57 printk("Failed to ioremap\n");
58 return -EIO;
59 }
60
61 simple_map_init(&physmap_map);
62
63 mymtd = NULL;
64 type = rom_probe_types;
65 for(; !mymtd && *type; type++) {
66 mymtd = do_map_probe(*type, &physmap_map);
67 }
68 if (mymtd) {
69 mymtd->owner = THIS_MODULE;
70
71#ifdef CONFIG_MTD_PARTITIONS
72 mtd_parts_nb = parse_mtd_partitions(mymtd, part_probes,
73 &mtd_parts, 0);
74
75 if (mtd_parts_nb > 0)
76 {
77 add_mtd_partitions (mymtd, mtd_parts, mtd_parts_nb);
78 return 0;
79 }
80
81 if (num_physmap_partitions != 0)
82 {
83 printk(KERN_NOTICE
84 "Using physmap partition definition\n");
85 add_mtd_partitions (mymtd, physmap_partitions, num_physmap_partitions);
86 return 0;
87 }
88
89#endif
90 add_mtd_device(mymtd);
91
92 return 0;
93 }
94
95 iounmap(physmap_map.virt);
96 return -ENXIO;
97}
98
99static void __exit cleanup_physmap(void)
100{
101#ifdef CONFIG_MTD_PARTITIONS
102 if (mtd_parts_nb) {
103 del_mtd_partitions(mymtd);
104 kfree(mtd_parts);
105 } else if (num_physmap_partitions) {
106 del_mtd_partitions(mymtd);
107 } else {
108 del_mtd_device(mymtd);
109 }
110#else
111 del_mtd_device(mymtd);
112#endif
113 map_destroy(mymtd);
114
115 iounmap(physmap_map.virt);
116 physmap_map.virt = NULL;
117}
118
119module_init(init_physmap);
120module_exit(cleanup_physmap);
121
122
123MODULE_LICENSE("GPL");
124MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
125MODULE_DESCRIPTION("Generic configurable MTD map driver");