tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
33static struct mtd_info *impa7_mtd[NUM_FLASHBANKS];
34
35
36static 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 */
52static struct mtd_partition static_partitions[] =
53{
54 {
55 .name = "FileSystem",
56 .size = 0x800000,
57 .offset = 0x00000000
58 },
59};
60
61static int mtd_parts_nb[NUM_FLASHBANKS];
62static struct mtd_partition *mtd_parts[NUM_FLASHBANKS];
63
64static const char *probes[] = { "cmdlinepart", NULL };
65
66static int __init init_impa7(void)
67{
68 static const char *rom_probe_types[] = PROBETYPES;
69 const char **type;
70 const char *part_type = 0;
71 int i;
72 static struct { u_long addr; u_long size; } pt[NUM_FLASHBANKS] = {
73 { WINDOW_ADDR0, WINDOW_SIZE0 },
74 { WINDOW_ADDR1, WINDOW_SIZE1 },
75 };
76 int devicesfound = 0;
77
78 for(i=0; i<NUM_FLASHBANKS; i++)
79 {
80 printk(KERN_NOTICE MSG_PREFIX "probing 0x%08lx at 0x%08lx\n",
81 pt[i].size, pt[i].addr);
82
83 impa7_map[i].phys = pt[i].addr;
84 impa7_map[i].virt = ioremap(pt[i].addr, pt[i].size);
85 if (!impa7_map[i].virt) {
86 printk(MSG_PREFIX "failed to ioremap\n");
87 return -EIO;
88 }
89 simple_map_init(&impa7_map[i]);
90
91 impa7_mtd[i] = 0;
92 type = rom_probe_types;
93 for(; !impa7_mtd[i] && *type; type++) {
94 impa7_mtd[i] = do_map_probe(*type, &impa7_map[i]);
95 }
96
97 if (impa7_mtd[i]) {
98 impa7_mtd[i]->owner = THIS_MODULE;
99 devicesfound++;
100 mtd_parts_nb[i] = parse_mtd_partitions(impa7_mtd[i],
101 probes,
102 &mtd_parts[i],
103 0);
104 if (mtd_parts_nb[i] > 0) {
105 part_type = "command line";
106 } else {
107 mtd_parts[i] = static_partitions;
108 mtd_parts_nb[i] = ARRAY_SIZE(static_partitions);
109 part_type = "static";
110 }
111
112 printk(KERN_NOTICE MSG_PREFIX
113 "using %s partition definition\n",
114 part_type);
115 mtd_device_register(impa7_mtd[i],
116 mtd_parts[i], mtd_parts_nb[i]);
117 }
118 else
119 iounmap((void *)impa7_map[i].virt);
120 }
121 return devicesfound == 0 ? -ENXIO : 0;
122}
123
124static void __exit cleanup_impa7(void)
125{
126 int i;
127 for (i=0; i<NUM_FLASHBANKS; i++) {
128 if (impa7_mtd[i]) {
129 mtd_device_unregister(impa7_mtd[i]);
130 map_destroy(impa7_mtd[i]);
131 iounmap((void *)impa7_map[i].virt);
132 impa7_map[i].virt = 0;
133 }
134 }
135}
136
137module_init(init_impa7);
138module_exit(cleanup_impa7);
139
140MODULE_LICENSE("GPL");
141MODULE_AUTHOR("Pavel Bartusek <pba@sysgo.de>");
142MODULE_DESCRIPTION("MTD map driver for implementa impA7");