| 1 | /* |
| 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. |
| 6 | * |
| 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. |
| 11 | * |
| 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 |
| 15 | * |
| 16 | * Copyright (C) 2004 Liu Peng Infineon IFAP DC COM CPE |
| 17 | * Copyright (C) 2008 John Crispin <blogic@openwrt.org> |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/io.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 <linux/magic.h> |
| 30 | #include <linux/platform_device.h> |
| 31 | |
| 32 | #include <ifxmips.h> |
| 33 | #include <ifxmips_prom.h> |
| 34 | #include <ifxmips_ebu.h> |
| 35 | |
| 36 | #ifndef CONFIG_MTD_PARTITIONS |
| 37 | #error Please enable CONFIG_MTD_PARTITIONS |
| 38 | #endif |
| 39 | |
| 40 | static struct map_info ifxmips_map = { |
| 41 | .name = "ifx-nor", |
| 42 | .bankwidth = 2, |
| 43 | .size = 0x400000, |
| 44 | }; |
| 45 | |
| 46 | static map_word ifxmips_read16(struct map_info *map, unsigned long adr) |
| 47 | { |
| 48 | unsigned long flags; |
| 49 | map_word temp; |
| 50 | spin_lock_irqsave(&ebu_lock, flags); |
| 51 | adr ^= 2; |
| 52 | temp.x[0] = *((__u16 *)(map->virt + adr)); |
| 53 | spin_unlock_irqrestore(&ebu_lock, flags); |
| 54 | return temp; |
| 55 | } |
| 56 | |
| 57 | static void ifxmips_write16(struct map_info *map, map_word d, unsigned long adr) |
| 58 | { |
| 59 | unsigned long flags; |
| 60 | spin_lock_irqsave(&ebu_lock, flags); |
| 61 | adr ^= 2; |
| 62 | *((__u16 *)(map->virt + adr)) = d.x[0]; |
| 63 | spin_unlock_irqrestore(&ebu_lock, flags); |
| 64 | } |
| 65 | |
| 66 | void ifxmips_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len) |
| 67 | { |
| 68 | unsigned char *p; |
| 69 | unsigned char *to_8; |
| 70 | unsigned long flags; |
| 71 | spin_lock_irqsave(&ebu_lock, flags); |
| 72 | from = (unsigned long)(from + map->virt); |
| 73 | p = (unsigned char *) from; |
| 74 | to_8 = (unsigned char *) to; |
| 75 | while (len--) |
| 76 | *to_8++ = *p++; |
| 77 | spin_unlock_irqrestore(&ebu_lock, flags); |
| 78 | } |
| 79 | |
| 80 | void ifxmips_copy_to(struct map_info *map, |
| 81 | unsigned long to, |
| 82 | const void *from, |
| 83 | ssize_t len) |
| 84 | { |
| 85 | unsigned char *p = (unsigned char *)from; |
| 86 | unsigned char *to_8; |
| 87 | unsigned long flags; |
| 88 | spin_lock_irqsave(&ebu_lock, flags); |
| 89 | to += (unsigned long) map->virt; |
| 90 | to_8 = (unsigned char *)to; |
| 91 | while (len--) |
| 92 | *p++ = *to_8++; |
| 93 | spin_unlock_irqrestore(&ebu_lock, flags); |
| 94 | } |
| 95 | |
| 96 | static struct mtd_partition ifxmips_partitions[] = { |
| 97 | { |
| 98 | .name = "uboot", |
| 99 | .offset = 0x00000000, |
| 100 | .size = 0x00020000, |
| 101 | }, |
| 102 | { |
| 103 | .name = "uboot_env", |
| 104 | .offset = 0x00020000, |
| 105 | .size = 0x0, |
| 106 | }, |
| 107 | { |
| 108 | .name = "kernel", |
| 109 | .offset = 0x0, |
| 110 | .size = 0x0, |
| 111 | }, |
| 112 | { |
| 113 | .name = "rootfs", |
| 114 | .offset = 0x0, |
| 115 | .size = 0x0, |
| 116 | }, |
| 117 | { |
| 118 | .name = "board_config", |
| 119 | .offset = 0x0, |
| 120 | .size = 0x0, |
| 121 | }, |
| 122 | }; |
| 123 | |
| 124 | static struct mtd_partition ifxmips_meta_partition = { |
| 125 | .name = "linux", |
| 126 | .offset = 0x00030000, |
| 127 | .size = 0x0, |
| 128 | }; |
| 129 | |
| 130 | static const char *part_probe_types[] = { "cmdlinepart", NULL }; |
| 131 | |
| 132 | int find_uImage_size(unsigned long start_offset) |
| 133 | { |
| 134 | unsigned long magic; |
| 135 | unsigned long temp; |
| 136 | ifxmips_copy_from(&ifxmips_map, &magic, start_offset, 4); |
| 137 | if (le32_to_cpu(magic) != 0x56190527) { |
| 138 | printk(KERN_INFO "ifxmips_mtd: invalid magic (0x%08X) of kernel at 0x%08lx \n", le32_to_cpu(magic), start_offset); |
| 139 | return 0; |
| 140 | } |
| 141 | ifxmips_copy_from(&ifxmips_map, &temp, start_offset + 12, 4); |
| 142 | printk(KERN_INFO "ifxmips_mtd: kernel size is %ld \n", temp + 0x40); |
| 143 | return temp + 0x40; |
| 144 | } |
| 145 | |
| 146 | int find_brn_block(unsigned long start_offset) |
| 147 | { |
| 148 | unsigned char temp[9]; |
| 149 | ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 8); |
| 150 | temp[8] = '\0'; |
| 151 | printk(KERN_INFO "data in brn block %s\n", temp); |
| 152 | if (memcmp(temp, "BRN-BOOT", 8) == 0) |
| 153 | return 1; |
| 154 | else |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | int detect_squashfs_partition(unsigned long start_offset) |
| 159 | { |
| 160 | unsigned long temp; |
| 161 | ifxmips_copy_from(&ifxmips_map, &temp, start_offset, 4); |
| 162 | return le32_to_cpu(temp) == SQUASHFS_MAGIC; |
| 163 | } |
| 164 | |
| 165 | static int ifxmips_mtd_probe(struct platform_device *dev) |
| 166 | { |
| 167 | struct mtd_info *ifxmips_mtd = NULL; |
| 168 | struct mtd_partition *parts = NULL; |
| 169 | unsigned long uimage_size; |
| 170 | int err, i; |
| 171 | int kernel_part = 2, rootfs_part = 3; |
| 172 | int num_parts = ARRAY_SIZE(ifxmips_partitions); |
| 173 | |
| 174 | ifxmips_w32(0x1d7ff, IFXMIPS_EBU_BUSCON0); |
| 175 | |
| 176 | ifxmips_map.read = ifxmips_read16; |
| 177 | ifxmips_map.write = ifxmips_write16; |
| 178 | ifxmips_map.copy_from = ifxmips_copy_from; |
| 179 | ifxmips_map.copy_to = ifxmips_copy_to; |
| 180 | ifxmips_map.phys = dev->resource->start; |
| 181 | ifxmips_map.size = dev->resource->end - ifxmips_map.phys + 1; |
| 182 | ifxmips_map.virt = ioremap_nocache(ifxmips_map.phys, ifxmips_map.size); |
| 183 | |
| 184 | if (!ifxmips_map.virt) { |
| 185 | printk(KERN_WARNING "ifxmips_mtd: failed to ioremap!\n"); |
| 186 | return -EIO; |
| 187 | } |
| 188 | |
| 189 | ifxmips_mtd = (struct mtd_info *) do_map_probe("cfi_probe", &ifxmips_map); |
| 190 | if (!ifxmips_mtd) { |
| 191 | iounmap(ifxmips_map.virt); |
| 192 | printk(KERN_WARNING "ifxmips_mtd: probing failed\n"); |
| 193 | return -ENXIO; |
| 194 | } |
| 195 | |
| 196 | ifxmips_mtd->owner = THIS_MODULE; |
| 197 | |
| 198 | err = parse_mtd_partitions(ifxmips_mtd, part_probe_types, &parts, 0); |
| 199 | if (err > 0) { |
| 200 | printk(KERN_INFO "ifxmips_mtd: found %d partitions from cmdline\n", err); |
| 201 | num_parts = err; |
| 202 | kernel_part = 0; |
| 203 | rootfs_part = 0; |
| 204 | for (i = 0; i < num_parts; i++) { |
| 205 | if (strcmp(parts[i].name, "kernel") == 0) |
| 206 | kernel_part = i; |
| 207 | if (strcmp(parts[i].name, "rootfs") == 0) |
| 208 | rootfs_part = i; |
| 209 | } |
| 210 | } else { |
| 211 | /* if the flash is 64k sectors, the kernel will reside at 0xb0030000 |
| 212 | if the flash is 128k sectors, the kernel will reside at 0xb0040000 */ |
| 213 | ifxmips_partitions[1].size = ifxmips_mtd->erasesize; |
| 214 | ifxmips_partitions[2].offset = ifxmips_partitions[1].offset + ifxmips_mtd->erasesize; |
| 215 | parts = &ifxmips_partitions[0]; |
| 216 | } |
| 217 | |
| 218 | /* dynamic size detection only if rootfs-part follows kernel-part */ |
| 219 | if (kernel_part+1 == rootfs_part) { |
| 220 | uimage_size = find_uImage_size(parts[kernel_part].offset); |
| 221 | |
| 222 | if (detect_squashfs_partition(parts[kernel_part].offset + uimage_size)) { |
| 223 | printk(KERN_INFO "ifxmips_mtd: found a squashfs following the uImage\n"); |
| 224 | } else { |
| 225 | uimage_size &= ~(ifxmips_mtd->erasesize -1); |
| 226 | uimage_size += ifxmips_mtd->erasesize; |
| 227 | } |
| 228 | |
| 229 | parts[kernel_part].size = uimage_size; |
| 230 | parts[rootfs_part].offset = parts[kernel_part].offset + parts[kernel_part].size; |
| 231 | parts[rootfs_part].size = ((ifxmips_mtd->size >> 20) * 1024 * 1024) - parts[rootfs_part].offset; |
| 232 | |
| 233 | ifxmips_meta_partition.offset = parts[kernel_part].offset; |
| 234 | ifxmips_meta_partition.size = parts[kernel_part].size + parts[rootfs_part].size; |
| 235 | } |
| 236 | |
| 237 | if (err <= 0) { |
| 238 | if (ifxmips_has_brn_block()) { |
| 239 | parts[3].size -= ifxmips_mtd->erasesize; |
| 240 | parts[4].offset = ifxmips_mtd->size - ifxmips_mtd->erasesize; |
| 241 | parts[4].size = ifxmips_mtd->erasesize; |
| 242 | ifxmips_meta_partition.size -= ifxmips_mtd->erasesize; |
| 243 | } else { |
| 244 | num_parts--; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | add_mtd_partitions(ifxmips_mtd, parts, num_parts); |
| 249 | add_mtd_partitions(ifxmips_mtd, &ifxmips_meta_partition, 1); |
| 250 | |
| 251 | printk(KERN_INFO "ifxmips_mtd: added %s flash with %dMB\n", |
| 252 | ifxmips_map.name, ((int)ifxmips_mtd->size) >> 20); |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | static struct platform_driver ifxmips_mtd_driver = { |
| 257 | .probe = ifxmips_mtd_probe, |
| 258 | .driver = { |
| 259 | .name = "ifxmips_mtd", |
| 260 | .owner = THIS_MODULE, |
| 261 | }, |
| 262 | }; |
| 263 | |
| 264 | int __init init_ifxmips_mtd(void) |
| 265 | { |
| 266 | int ret = platform_driver_register(&ifxmips_mtd_driver); |
| 267 | if (ret) |
| 268 | printk(KERN_INFO "ifxmips_mtd: error registering platfom driver!"); |
| 269 | return ret; |
| 270 | } |
| 271 | |
| 272 | static void __exit cleanup_ifxmips_mtd(void) |
| 273 | { |
| 274 | platform_driver_unregister(&ifxmips_mtd_driver); |
| 275 | } |
| 276 | |
| 277 | module_init(init_ifxmips_mtd); |
| 278 | module_exit(cleanup_ifxmips_mtd); |
| 279 | |
| 280 | MODULE_LICENSE("GPL"); |
| 281 | MODULE_AUTHOR("John Crispin <blogic@openwrt.org>"); |
| 282 | MODULE_DESCRIPTION("MTD map driver for IFXMIPS boards"); |
| 283 | |
