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");