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1 | /* | |
2 | * Handle mapping of the NOR flash on implementa A7 boards | |
3 | * | |
4 | * Copyright 2002 SYSGO Real-Time Solutions GmbH | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/types.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <asm/io.h> | |
16 | #include <linux/mtd/mtd.h> | |
17 | #include <linux/mtd/map.h> | |
18 | #include <linux/mtd/partitions.h> | |
19 | ||
20 | #define WINDOW_ADDR0 0x00000000 /* physical properties of flash */ | |
21 | #define WINDOW_SIZE0 0x00800000 | |
22 | #define WINDOW_ADDR1 0x10000000 /* physical properties of flash */ | |
23 | #define WINDOW_SIZE1 0x00800000 | |
24 | #define NUM_FLASHBANKS 2 | |
25 | #define BUSWIDTH 4 | |
26 | ||
27 | /* can be { "cfi_probe", "jedec_probe", "map_rom", NULL } */ | |
28 | #define PROBETYPES { "jedec_probe", NULL } | |
29 | ||
30 | #define MSG_PREFIX "impA7:" /* prefix for our printk()'s */ | |
31 | #define MTDID "impa7-%d" /* for mtdparts= partitioning */ | |
32 | ||
33 | static struct mtd_info *impa7_mtd[NUM_FLASHBANKS]; | |
34 | ||
35 | ||
36 | static struct map_info impa7_map[NUM_FLASHBANKS] = { | |
37 | { | |
38 | .name = "impA7 NOR Flash Bank #0", | |
39 | .size = WINDOW_SIZE0, | |
40 | .bankwidth = BUSWIDTH, | |
41 | }, | |
42 | { | |
43 | .name = "impA7 NOR Flash Bank #1", | |
44 | .size = WINDOW_SIZE1, | |
45 | .bankwidth = BUSWIDTH, | |
46 | }, | |
47 | }; | |
48 | ||
49 | /* | |
50 | * MTD partitioning stuff | |
51 | */ | |
52 | static struct mtd_partition partitions[] = | |
53 | { | |
54 | { | |
55 | .name = "FileSystem", | |
56 | .size = 0x800000, | |
57 | .offset = 0x00000000 | |
58 | }, | |
59 | }; | |
60 | ||
61 | static int __init init_impa7(void) | |
62 | { | |
63 | static const char *rom_probe_types[] = PROBETYPES; | |
64 | const char **type; | |
65 | int i; | |
66 | static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = { | |
67 | { WINDOW_ADDR0, WINDOW_SIZE0 }, | |
68 | { WINDOW_ADDR1, WINDOW_SIZE1 }, | |
69 | }; | |
70 | int devicesfound = 0; | |
71 | ||
72 | for(i=0; i<NUM_FLASHBANKS; i++) | |
73 | { | |
74 | printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n", | |
75 | pt[i].size, pt[i].addr); | |
76 | ||
77 | impa7_map[i].phys = pt[i].addr; | |
78 | impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size); | |
79 | if (!impa7_map[i].virt) { | |
80 | printk(MSG_PREFIX "failed to ioremap\n"); | |
81 | return -EIO; | |
82 | } | |
83 | simple_map_init(&impa7_map[i]); | |
84 | ||
85 | impa7_mtd[i] = 0; | |
86 | type = rom_probe_types; | |
87 | for(; !impa7_mtd[i] && *type; type++) { | |
88 | impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]); | |
89 | } | |
90 | ||
91 | if (impa7_mtd[i]) { | |
92 | impa7_mtd[i]->owner = THIS_MODULE; | |
93 | devicesfound++; | |
94 | mtd_device_parse_register(impa7_mtd[i], NULL, NULL, | |
95 | partitions, | |
96 | ARRAY_SIZE(partitions)); | |
97 | } | |
98 | else | |
99 | iounmap((void *)impa7_map[i].virt); | |
100 | } | |
101 | return devicesfound == 0 ? -ENXIO : 0; | |
102 | } | |
103 | ||
104 | static void __exit cleanup_impa7(void) | |
105 | { | |
106 | int i; | |
107 | for (i=0; i<NUM_FLASHBANKS; i++) { | |
108 | if (impa7_mtd[i]) { | |
109 | mtd_device_unregister(impa7_mtd[i]); | |
110 | map_destroy(impa7_mtd[i]); | |
111 | iounmap((void *)impa7_map[i].virt); | |
112 | impa7_map[i].virt = 0; | |
113 | } | |
114 | } | |
115 | } | |
116 | ||
117 | module_init(init_impa7); | |
118 | module_exit(cleanup_impa7); | |
119 | ||
120 | MODULE_LICENSE("GPL"); | |
121 | MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>"); | |
122 | MODULE_DESCRIPTION("MTD map driver for implementa impA7"); |