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 <linux/magic.h>
31 #include <linux/platform_device.h>
34 static struct map_info
36 .name
= "ifxmips_mtd",
42 ifxmips_read16(struct map_info
* map
, unsigned long adr
)
47 temp
.x
[0] = *((__u16
*) (map
->virt
+ adr
));
53 ifxmips_write16(struct map_info
*map
, map_word d
, unsigned long adr
)
56 *((__u16
*) (map
->virt
+ adr
)) = d
.x
[0];
60 ifxmips_copy_from(struct map_info
*map
, void *to
, unsigned long from
, ssize_t len
)
65 from
= (unsigned long)(from
+ map
->virt
);
66 p
= (unsigned char*) from
;
67 to_8
= (unsigned char*) to
;
73 ifxmips_copy_to(struct map_info
*map
, unsigned long to
, const void *from
, ssize_t len
)
75 unsigned char *p
= (unsigned char*)from
;
78 to
+= (unsigned long) map
->virt
;
79 to_8
= (unsigned char*)to
;
85 static struct mtd_partition
86 ifxmips_partitions
[4] = {
110 find_uImage_size(unsigned long start_offset
){
113 ifxmips_copy_from(&ifxmips_map
, &temp
, start_offset
+ 12, 4);
114 printk(KERN_INFO
"ifxmips_mtd: kernel size is %ld \n", temp
+ 0x40);
119 detect_squashfs_partition(unsigned long start_offset
){
122 ifxmips_copy_from(&ifxmips_map
, &temp
, start_offset
, 4);
124 return (temp
== SQUASHFS_MAGIC
);
128 ifxmips_mtd_probe(struct platform_device
*dev
)
130 struct mtd_info
*ifxmips_mtd
= NULL
;
131 struct mtd_partition
*parts
= NULL
;
132 unsigned long uimage_size
;
134 ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0
);
136 ifxmips_map
.read
= ifxmips_read16
;
137 ifxmips_map
.write
= ifxmips_write16
;
138 ifxmips_map
.copy_from
= ifxmips_copy_from
;
139 ifxmips_map
.copy_to
= ifxmips_copy_to
;
141 ifxmips_map
.phys
= IFXMIPS_FLASH_START
;
142 ifxmips_map
.virt
= ioremap_nocache(IFXMIPS_FLASH_START
, IFXMIPS_FLASH_MAX
);
143 ifxmips_map
.size
= IFXMIPS_FLASH_MAX
;
144 if(!ifxmips_map
.virt
)
146 printk(KERN_WARNING
"ifxmips_mtd: failed to ioremap!\n");
150 ifxmips_mtd
= (struct mtd_info
*) do_map_probe("cfi_probe", &ifxmips_map
);
153 iounmap(ifxmips_map
.virt
);
154 printk(KERN_WARNING
"ifxmips_mtd: probing failed\n");
158 ifxmips_mtd
->owner
= THIS_MODULE
;
160 uimage_size
= find_uImage_size(ifxmips_partitions
[2].offset
);
162 if(detect_squashfs_partition(ifxmips_partitions
[2].offset
+ uimage_size
))
164 printk(KERN_INFO
"ifxmips_mtd: found a squashfs following the uImage\n");
166 uimage_size
&= ~0xffff;
167 uimage_size
+= 0x10000;
170 ifxmips_partitions
[2].size
= uimage_size
;
171 ifxmips_partitions
[3].offset
= ifxmips_partitions
[2].offset
+ ifxmips_partitions
[2].size
;
172 ifxmips_partitions
[3].size
= ((ifxmips_mtd
->size
>> 20) * 1024 * 1024) - ifxmips_partitions
[3].offset
;
174 parts
= &ifxmips_partitions
[0];
175 add_mtd_partitions(ifxmips_mtd
, parts
, 4);
177 printk(KERN_INFO
"ifxmips_mtd: added ifxmips flash with %dMB\n", ifxmips_mtd
->size
>> 20);
182 platform_driver ifxmips_mtd_driver
= {
183 .probe
= ifxmips_mtd_probe
,
185 .name
= "ifxmips_mtd",
186 .owner
= THIS_MODULE
,
191 init_ifxmips_mtd(void)
193 int ret
= platform_driver_register(&ifxmips_mtd_driver
);
195 printk(KERN_INFO
"ifxmips_mtd: error registering platfom driver!");
201 cleanup_ifxmips_mtd(void)
203 platform_driver_unregister(&ifxmips_mtd_driver
);
206 module_init(init_ifxmips_mtd
);
207 module_exit(cleanup_ifxmips_mtd
);
209 MODULE_LICENSE("GPL");
210 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
211 MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards");