2 * Driver for IFXMIPS flashmap
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE
19 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/kernel.h>
26 #include <linux/init.h>
27 #include <linux/mtd/mtd.h>
28 #include <linux/mtd/map.h>
29 #include <linux/mtd/partitions.h>
30 #include <linux/mtd/cfi.h>
31 #include <asm/ifxmips/ifxmips.h>
32 #include <linux/magic.h>
33 #include <linux/platform_device.h>
35 #define DRVNAME "ifxmips_mtd"
37 static struct map_info
45 ifxmips_read16 (struct map_info * map, unsigned long adr)
50 temp.x[0] = *((__u16 *) (map->virt + adr));
56 ifxmips_write16 (struct map_info *map, map_word d, unsigned long adr)
59 *((__u16 *) (map->virt + adr)) = d.x[0];
63 ifxmips_copy_from (struct map_info *map, void *to, unsigned long from, ssize_t len)
68 from = (unsigned long) (from + map->virt);
77 ifxmips_copy_to (struct map_info *map, unsigned long to, const void *from, ssize_t len)
82 to += (unsigned long) map->virt;
89 static struct mtd_partition
90 ifxmips_partitions[4] = {
114 find_uImage_size (unsigned long start_offset){
117 ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4);
118 printk(KERN_INFO DRVNAME ": kernel size is %ld \n", temp + 0x40);
123 detect_squashfs_partition (unsigned long start_offset){
126 ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4);
128 return (temp == SQUASHFS_MAGIC);
132 ifxmips_mtd_probe (void)
134 struct mtd_info *ifxmips_mtd = NULL;
135 struct mtd_partition *parts = NULL;
136 unsigned long uimage_size;
138 ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0);
140 ifxmips_map.read = ifxmips_read16;
141 ifxmips_map.write = ifxmips_write16;
142 ifxmips_map.copy_from = ifxmips_copy_from;
143 ifxmips_map.copy_to = ifxmips_copy_to;
145 ifxmips_map.phys = IFXMIPS_FLASH_START;
146 ifxmips_map.virt = ioremap_nocache(IFXMIPS_FLASH_START, IFXMIPS_FLASH_MAX);
147 ifxmips_map.size = IFXMIPS_FLASH_MAX;
148 if (!ifxmips_map.virt) {
149 printk(KERN_WARNING DRVNAME ": failed to ioremap!\n");
153 ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map);
155 iounmap(ifxmips_map.virt);
156 printk(KERN_WARNING DRVNAME ": probing failed\n");
160 ifxmips_mtd->owner = THIS_MODULE;
162 uimage_size = find_uImage_size(ifxmips_partitions[2].offset);
164 if(detect_squashfs_partition(ifxmips_partitions[2].offset + uimage_size)){
165 printk(KERN_INFO DRVNAME ": found a squashfs following the uImage\n");
167 uimage_size &= ~0xffff;
168 uimage_size += 0x10000;
171 ifxmips_partitions[2].size = uimage_size;
172 ifxmips_partitions[3].offset = ifxmips_partitions[2].offset + ifxmips_partitions[2].size;
173 ifxmips_partitions[3].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - ifxmips_partitions[3].offset;
175 parts = &ifxmips_partitions[0];
176 add_mtd_partitions(ifxmips_mtd, parts, 4);
178 printk(KERN_INFO DRVNAME ": added ifxmips flash with %dMB\n", ifxmips_mtd->size >> 20);
183 platform_driver ifxmips_mtd_driver = {
184 .probe = ifxmips_mtd_probe,
187 .owner = THIS_MODULE,
192 init_ifxmips_mtd (void)
194 int ret = platform_driver_register(&ifxmips_mtd_driver);
196 printk(KERN_INFO DRVNAME ": error registering platfom driver!");
203 cleanup_ifxmips_mtd (void)
205 platform_driver_unregister(&ifxmips_mtd_driver);
208 module_init (init_ifxmips_mtd);
209 module_exit (cleanup_ifxmips_mtd);
211 MODULE_LICENSE ("GPL");
212 MODULE_AUTHOR ("John Crispin <blogic@openwrt.org>");
213 MODULE_DESCRIPTION ("MTD map driver for IFXMIPS boards");