2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
17 * Copyright (C) 2008 John Crispin <blogic@openwrt.org>
20 #include <linux/module.h>
21 #include <linux/types.h>
22 #include <linux/kernel.h>
24 #include <linux/init.h>
25 #include <linux/mtd/mtd.h>
26 #include <linux/mtd/map.h>
27 #include <linux/mtd/partitions.h>
28 #include <linux/mtd/cfi.h>
29 #include <asm/ifxmips/ifxmips.h>
30 #include <asm/ifxmips/ifxmips_prom.h>
31 #include <asm/ifxmips/ifxmips_ebu.h>
32 #include <linux/magic.h>
33 #include <linux/platform_device.h>
35 #ifndef CONFIG_MTD_PARTITIONS
36 #error Please enable CONFIG_MTD_PARTITIONS
39 static struct map_info ifxmips_map
= {
45 static map_word
ifxmips_read16(struct map_info
*map
, unsigned long adr
)
49 spin_lock_irqsave(&ebu_lock
, flags
);
51 temp
.x
[0] = *((__u16
*)(map
->virt
+ adr
));
52 spin_unlock_irqrestore(&ebu_lock
, flags
);
56 static void ifxmips_write16(struct map_info
*map
, map_word d
, unsigned long adr
)
59 spin_lock_irqsave(&ebu_lock
, flags
);
61 *((__u16
*)(map
->virt
+ adr
)) = d
.x
[0];
62 spin_unlock_irqrestore(&ebu_lock
, flags
);
65 void ifxmips_copy_from(struct map_info
*map
, void *to
, unsigned long from
, ssize_t len
)
70 spin_lock_irqsave(&ebu_lock
, flags
);
71 from
= (unsigned long)(from
+ map
->virt
);
72 p
= (unsigned char *) from
;
73 to_8
= (unsigned char *) to
;
76 spin_unlock_irqrestore(&ebu_lock
, flags
);
79 void ifxmips_copy_to(struct map_info
*map
,
84 unsigned char *p
= (unsigned char *)from
;
87 spin_lock_irqsave(&ebu_lock
, flags
);
88 to
+= (unsigned long) map
->virt
;
89 to_8
= (unsigned char *)to
;
92 spin_unlock_irqrestore(&ebu_lock
, flags
);
95 static struct mtd_partition ifxmips_partitions
[] = {
103 .offset
= 0x00020000,
108 .offset
= 0x00030000,
117 .name
= "board_config",
123 static struct mtd_partition ifxmips_meta_partition
= {
125 .offset
= 0x00030000,
129 static const char *part_probe_types
[] = { "cmdlinepart", NULL
};
131 int find_uImage_size(unsigned long start_offset
)
135 ifxmips_copy_from(&ifxmips_map
, &magic
, start_offset
, 4);
136 if (!(ntohl(magic
) == 0x27051956)) {
137 printk(KERN_INFO
"ifxmips_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", ntohl(magic
), start_offset
);
140 ifxmips_copy_from(&ifxmips_map
, &temp
, start_offset
+ 12, 4);
141 printk(KERN_INFO
"ifxmips_mtd: kernel size is %ld \n", temp
+ 0x40);
145 int find_brn_block(unsigned long start_offset
)
147 unsigned char temp
[9];
148 ifxmips_copy_from(&ifxmips_map
, &temp
, start_offset
, 8);
150 printk(KERN_INFO
"data in brn block %s\n", temp
);
151 if (memcmp(temp
, "BRN-BOOT", 8) == 0)
157 int detect_squashfs_partition(unsigned long start_offset
)
160 ifxmips_copy_from(&ifxmips_map
, &temp
, start_offset
, 4);
161 return temp
== SQUASHFS_MAGIC
;
164 static int ifxmips_mtd_probe(struct platform_device
*dev
)
166 struct mtd_info
*ifxmips_mtd
= NULL
;
167 struct mtd_partition
*parts
= NULL
;
168 unsigned long uimage_size
;
170 int kernel_part
= 2, rootfs_part
= 3;
171 int num_parts
= ARRAY_SIZE(ifxmips_partitions
);
173 ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0
);
175 ifxmips_map
.read
= ifxmips_read16
;
176 ifxmips_map
.write
= ifxmips_write16
;
177 ifxmips_map
.copy_from
= ifxmips_copy_from
;
178 ifxmips_map
.copy_to
= ifxmips_copy_to
;
179 ifxmips_map
.phys
= dev
->resource
->start
;
180 ifxmips_map
.size
= dev
->resource
->end
- ifxmips_map
.phys
+ 1;
181 ifxmips_map
.virt
= ioremap_nocache(ifxmips_map
.phys
, ifxmips_map
.size
);
183 if (!ifxmips_map
.virt
) {
184 printk(KERN_WARNING
"ifxmips_mtd: failed to ioremap!\n");
188 ifxmips_mtd
= (struct mtd_info
*) do_map_probe("cfi_probe", &ifxmips_map
);
190 iounmap(ifxmips_map
.virt
);
191 printk(KERN_WARNING
"ifxmips_mtd: probing failed\n");
195 ifxmips_mtd
->owner
= THIS_MODULE
;
197 err
= parse_mtd_partitions(ifxmips_mtd
, part_probe_types
, &parts
, 0);
199 printk(KERN_INFO
"ifxmips_mtd: found %d partitions from cmdline\n", err
);
203 for (i
= 0; i
< num_parts
; i
++) {
204 if (strcmp(parts
[i
].name
, "kernel") == 0)
206 if (strcmp(parts
[i
].name
, "rootfs") == 0)
210 parts
= &ifxmips_partitions
[0];
213 /* dynamic size detection only if rootfs-part follows kernel-part */
214 if (kernel_part
+1 == rootfs_part
) {
215 uimage_size
= find_uImage_size(parts
[kernel_part
].offset
);
217 if (detect_squashfs_partition(parts
[kernel_part
].offset
+ uimage_size
)) {
218 printk(KERN_INFO
"ifxmips_mtd: found a squashfs following the uImage\n");
220 uimage_size
&= ~0xffff;
221 uimage_size
+= 0x10000;
224 parts
[kernel_part
].size
= uimage_size
;
225 parts
[rootfs_part
].offset
= parts
[kernel_part
].offset
+ parts
[kernel_part
].size
;
226 parts
[rootfs_part
].size
= ((ifxmips_mtd
->size
>> 20) * 1024 * 1024) - parts
[rootfs_part
].offset
;
228 ifxmips_meta_partition
.offset
= parts
[kernel_part
].offset
;
229 ifxmips_meta_partition
.size
= parts
[kernel_part
].size
+ parts
[rootfs_part
].size
;
233 if (ifxmips_has_brn_block()) {
234 parts
[4].size
-= ifxmips_mtd
->erasesize
;
235 parts
[5].offset
= ifxmips_mtd
->size
- ifxmips_mtd
->erasesize
;
236 parts
[5].size
= ifxmips_mtd
->erasesize
;
242 add_mtd_partitions(ifxmips_mtd
, parts
, num_parts
);
243 add_mtd_partitions(ifxmips_mtd
, &ifxmips_meta_partition
, 1);
245 printk(KERN_INFO
"ifxmips_mtd: added %s flash with %dMB\n",
246 ifxmips_map
.name
, ifxmips_mtd
->size
>> 20);
250 static struct platform_driver ifxmips_mtd_driver
= {
251 .probe
= ifxmips_mtd_probe
,
253 .name
= "ifxmips_mtd",
254 .owner
= THIS_MODULE
,
258 int __init
init_ifxmips_mtd(void)
260 int ret
= platform_driver_register(&ifxmips_mtd_driver
);
262 printk(KERN_INFO
"ifxmips_mtd: error registering platfom driver!");
266 static void __exit
cleanup_ifxmips_mtd(void)
268 platform_driver_unregister(&ifxmips_mtd_driver
);
271 module_init(init_ifxmips_mtd
);
272 module_exit(cleanup_ifxmips_mtd
);
274 MODULE_LICENSE("GPL");
275 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
276 MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");