tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Flash memory access on Alchemy Pb1xxx boards
3 *
4 * (C) 2001 Pete Popov <ppopov@mvista.com>
5 *
6 * $Id: pb1xxx-flash.c,v 1.14 2004/11/04 13:24:15 gleixner Exp $
7 */
8
9#include <linux/config.h>
10#include <linux/module.h>
11#include <linux/types.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14
15#include <linux/mtd/mtd.h>
16#include <linux/mtd/map.h>
17#include <linux/mtd/partitions.h>
18
19#include <asm/io.h>
20
21#ifdef DEBUG_RW
22#define DBG(x...) printk(x)
23#else
24#define DBG(x...)
25#endif
26
27#ifdef CONFIG_MIPS_PB1000
28
29#define WINDOW_ADDR 0x1F800000
30#define WINDOW_SIZE 0x800000
31
32static struct mtd_partition pb1xxx_partitions[] = {
33 {
34 .name = "yamon env",
35 .size = 0x00020000,
36 .offset = 0,
37 .mask_flags = MTD_WRITEABLE},
38 {
39 .name = "User FS",
40 .size = 0x003e0000,
41 .offset = 0x20000,},
42 {
43 .name = "boot code",
44 .size = 0x100000,
45 .offset = 0x400000,
46 .mask_flags = MTD_WRITEABLE},
47 {
48 .name = "raw/kernel",
49 .size = 0x300000,
50 .offset = 0x500000}
51};
52
53#elif defined(CONFIG_MIPS_PB1500) || defined(CONFIG_MIPS_PB1100)
54
55#if defined(CONFIG_MTD_PB1500_BOOT) && defined(CONFIG_MTD_PB1500_USER)
56/* both 32MB banks will be used. Combine the first 32MB bank and the
57 * first 28MB of the second bank together into a single jffs/jffs2
58 * partition.
59 */
60#define WINDOW_ADDR 0x1C000000
61#define WINDOW_SIZE 0x4000000
62static struct mtd_partition pb1xxx_partitions[] = {
63 {
64 .name = "User FS",
65 .size = 0x3c00000,
66 .offset = 0x0000000
67 },{
68 .name = "yamon",
69 .size = 0x0100000,
70 .offset = 0x3c00000,
71 .mask_flags = MTD_WRITEABLE
72 },{
73 .name = "raw kernel",
74 .size = 0x02c0000,
75 .offset = 0x3d00000
76 }
77};
78#elif defined(CONFIG_MTD_PB1500_BOOT) && !defined(CONFIG_MTD_PB1500_USER)
79#define WINDOW_ADDR 0x1E000000
80#define WINDOW_SIZE 0x2000000
81static struct mtd_partition pb1xxx_partitions[] = {
82 {
83 .name = "User FS",
84 .size = 0x1c00000,
85 .offset = 0x0000000
86 },{
87 .name = "yamon",
88 .size = 0x0100000,
89 .offset = 0x1c00000,
90 .mask_flags = MTD_WRITEABLE
91 },{
92 .name = "raw kernel",
93 .size = 0x02c0000,
94 .offset = 0x1d00000
95 }
96};
97#elif !defined(CONFIG_MTD_PB1500_BOOT) && defined(CONFIG_MTD_PB1500_USER)
98#define WINDOW_ADDR 0x1C000000
99#define WINDOW_SIZE 0x2000000
100static struct mtd_partition pb1xxx_partitions[] = {
101 {
102 .name = "User FS",
103 .size = 0x1e00000,
104 .offset = 0x0000000
105 },{
106 .name = "raw kernel",
107 .size = 0x0200000,
108 .offset = 0x1e00000,
109 }
110};
111#else
112#error MTD_PB1500 define combo error /* should never happen */
113#endif
114#else
115#error Unsupported board
116#endif
117
118#define NAME "Pb1x00 Linux Flash"
119#define PADDR WINDOW_ADDR
120#define BUSWIDTH 4
121#define SIZE WINDOW_SIZE
122#define PARTITIONS 4
123
124static struct map_info pb1xxx_mtd_map = {
125 .name = NAME,
126 .size = SIZE,
127 .bankwidth = BUSWIDTH,
128 .phys = PADDR,
129};
130
131static struct mtd_info *pb1xxx_mtd;
132
133int __init pb1xxx_mtd_init(void)
134{
135 struct mtd_partition *parts;
136 int nb_parts = 0;
137 char *part_type;
138
139 /*
140 * Static partition definition selection
141 */
142 part_type = "static";
143 parts = pb1xxx_partitions;
144 nb_parts = ARRAY_SIZE(pb1xxx_partitions);
145
146 /*
147 * Now let's probe for the actual flash. Do it here since
148 * specific machine settings might have been set above.
149 */
150 printk(KERN_NOTICE "Pb1xxx flash: probing %d-bit flash bus\n",
151 BUSWIDTH*8);
152 pb1xxx_mtd_map.virt = ioremap(WINDOW_ADDR, WINDOW_SIZE);
153
154 simple_map_init(&pb1xxx_mtd_map);
155
156 pb1xxx_mtd = do_map_probe("cfi_probe", &pb1xxx_mtd_map);
157 if (!pb1xxx_mtd) return -ENXIO;
158 pb1xxx_mtd->owner = THIS_MODULE;
159
160 add_mtd_partitions(pb1xxx_mtd, parts, nb_parts);
161 return 0;
162}
163
164static void __exit pb1xxx_mtd_cleanup(void)
165{
166 if (pb1xxx_mtd) {
167 del_mtd_partitions(pb1xxx_mtd);
168 map_destroy(pb1xxx_mtd);
169 iounmap((void *) pb1xxx_mtd_map.virt);
170 }
171}
172
173module_init(pb1xxx_mtd_init);
174module_exit(pb1xxx_mtd_cleanup);
175
176MODULE_AUTHOR("Pete Popov");
177MODULE_DESCRIPTION("Pb1xxx CFI map driver");
178MODULE_LICENSE("GPL");