| 1 | /* |
| 2 | * AudioCodes AC49x PSPBoot-based flash partition table |
| 3 | * Copyright 2012 Daniel Golle <daniel.golle@gmail.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/slab.h> |
| 23 | |
| 24 | #include <linux/mtd/mtd.h> |
| 25 | #include <linux/mtd/partitions.h> |
| 26 | #include <linux/bootmem.h> |
| 27 | #include <linux/magic.h> |
| 28 | #include <linux/module.h> |
| 29 | |
| 30 | #include <asm/mach-ar7/prom.h> |
| 31 | |
| 32 | #define AC49X_MAXENVPARTS 8 |
| 33 | |
| 34 | #define AC49X_PARTTYPE_LOADER 0 |
| 35 | #define AC49X_PARTTYPE_BOOTENV 1 |
| 36 | #define AC49X_PARTTYPE_LINUX 2 |
| 37 | #define AC49X_PARTTYPE_ROOTFS 3 |
| 38 | #define AC49X_PARTTYPE_UNKNOWN 4 |
| 39 | #define AC49X_NUM_PARTTYPES 5 |
| 40 | |
| 41 | #define AC49X_FLASH_ADDRMASK 0x00FFFFFF |
| 42 | |
| 43 | #define AC49X_LOADER_MAGIC 0x40809000 |
| 44 | #define AC49X_LINUX_MAGIC 0x464c457f /* ELF */ |
| 45 | #define AC49X_BOOTENV_MAGIC 0x4578614d /* MaxE */ |
| 46 | |
| 47 | #define ROOTFS_MIN_OFFSET 0xC0000 |
| 48 | |
| 49 | int parse_partvar(const unsigned char *partvar, struct mtd_partition *part) |
| 50 | { |
| 51 | unsigned int partstart, partend; |
| 52 | unsigned int pnum; |
| 53 | |
| 54 | pnum = sscanf(partvar, "0x%x,0x%x", &partstart, &partend); |
| 55 | if (pnum != 2) |
| 56 | return 1; |
| 57 | |
| 58 | part->offset = partstart & AC49X_FLASH_ADDRMASK; |
| 59 | part->size = partend - partstart; |
| 60 | |
| 61 | return 0; |
| 62 | } |
| 63 | |
| 64 | int detect_parttype(struct mtd_info *master, struct mtd_partition part) |
| 65 | { |
| 66 | unsigned int magic; |
| 67 | size_t len; |
| 68 | |
| 69 | if (part.size < 4) |
| 70 | return -1; |
| 71 | |
| 72 | mtd_read(master, part.offset, sizeof(magic), &len, |
| 73 | (uint8_t *)&magic); |
| 74 | |
| 75 | if (len != sizeof(magic)) |
| 76 | return -1; |
| 77 | |
| 78 | switch (magic) { |
| 79 | case AC49X_LOADER_MAGIC: |
| 80 | return AC49X_PARTTYPE_LOADER; |
| 81 | case AC49X_LINUX_MAGIC: |
| 82 | return AC49X_PARTTYPE_LINUX; |
| 83 | case SQUASHFS_MAGIC: |
| 84 | case CRAMFS_MAGIC: |
| 85 | case CRAMFS_MAGIC_WEND: |
| 86 | return AC49X_PARTTYPE_ROOTFS; |
| 87 | case AC49X_BOOTENV_MAGIC: |
| 88 | return AC49X_PARTTYPE_BOOTENV; |
| 89 | default: |
| 90 | switch (magic & 0xFF) { |
| 91 | case JFFS2_SUPER_MAGIC: |
| 92 | return AC49X_PARTTYPE_ROOTFS; |
| 93 | } |
| 94 | switch (magic >> 8) { |
| 95 | case JFFS2_SUPER_MAGIC: |
| 96 | return AC49X_PARTTYPE_ROOTFS; |
| 97 | } |
| 98 | return AC49X_PARTTYPE_UNKNOWN; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | const char *partnames[] = { |
| 103 | "loader", |
| 104 | "config", |
| 105 | "linux", |
| 106 | "rootfs", |
| 107 | "data" |
| 108 | }; |
| 109 | |
| 110 | void gen_partname(unsigned int type, |
| 111 | unsigned int *typenumeration, |
| 112 | struct mtd_partition *part) |
| 113 | { |
| 114 | char *s = kzalloc(sizeof(char) * 8, GFP_KERNEL); |
| 115 | |
| 116 | (typenumeration[type])++; |
| 117 | if (typenumeration[type] == 1) |
| 118 | sprintf(s, "%s", partnames[type]); |
| 119 | else |
| 120 | sprintf(s, "%s%d", partnames[type], typenumeration[type]); |
| 121 | |
| 122 | part->name = s; |
| 123 | } |
| 124 | |
| 125 | static int create_mtd_partitions(struct mtd_info *master, |
| 126 | struct mtd_partition **pparts, |
| 127 | struct mtd_part_parser_data *data) |
| 128 | { |
| 129 | unsigned int envpartnum = 0, linuxpartnum = 0; |
| 130 | unsigned int typenumeration[5] = { 0, 0, 0, 0, 0 }; |
| 131 | unsigned char evn[5]; |
| 132 | const unsigned char *partvar = NULL; |
| 133 | |
| 134 | struct mtd_partition *ac49x_parts; |
| 135 | |
| 136 | ac49x_parts = kzalloc(sizeof(*ac49x_parts) * AC49X_MAXENVPARTS, |
| 137 | GFP_KERNEL); |
| 138 | |
| 139 | if (!ac49x_parts) |
| 140 | return -ENOMEM; |
| 141 | |
| 142 | linuxpartnum = 0; |
| 143 | for (envpartnum = 0; envpartnum < AC49X_MAXENVPARTS; envpartnum++) { |
| 144 | struct mtd_partition parsepart; |
| 145 | unsigned int offset, size, type; |
| 146 | int err; |
| 147 | sprintf(evn, "mtd%d", envpartnum); |
| 148 | partvar = prom_getenv(evn); |
| 149 | if (!partvar) |
| 150 | continue; |
| 151 | err = parse_partvar(partvar, &parsepart); |
| 152 | if (err) |
| 153 | continue; |
| 154 | offset = parsepart.offset; |
| 155 | size = parsepart.size; |
| 156 | type = detect_parttype(master, parsepart); |
| 157 | gen_partname(type, typenumeration, &parsepart); |
| 158 | /* protect loader */ |
| 159 | if (type == AC49X_PARTTYPE_LOADER) |
| 160 | parsepart.mask_flags = MTD_WRITEABLE; |
| 161 | else |
| 162 | parsepart.mask_flags = 0; |
| 163 | |
| 164 | memcpy(&(ac49x_parts[linuxpartnum]), &parsepart, |
| 165 | sizeof(struct mtd_partition)); |
| 166 | |
| 167 | /* scan for contained rootfs */ |
| 168 | if (type == AC49X_PARTTYPE_LINUX) { |
| 169 | parsepart.offset += ROOTFS_MIN_OFFSET & |
| 170 | ~(master->erasesize - 1); |
| 171 | parsepart.size -= ROOTFS_MIN_OFFSET & |
| 172 | ~(master->erasesize - 1); |
| 173 | do { |
| 174 | unsigned int size, offset; |
| 175 | size = parsepart.size; |
| 176 | offset = parsepart.offset; |
| 177 | |
| 178 | type = detect_parttype(master, parsepart); |
| 179 | if (type == AC49X_PARTTYPE_ROOTFS) { |
| 180 | gen_partname(type, typenumeration, |
| 181 | &parsepart); |
| 182 | printk(KERN_INFO |
| 183 | "%s %s: 0x%08x@0x%08x\n", |
| 184 | "detected sub-partition", |
| 185 | parsepart.name, |
| 186 | (unsigned int)parsepart.size, |
| 187 | (unsigned int)parsepart.offset); |
| 188 | linuxpartnum++; |
| 189 | memcpy(&(ac49x_parts[linuxpartnum]), |
| 190 | &parsepart, |
| 191 | sizeof(struct mtd_partition)); |
| 192 | break; |
| 193 | } |
| 194 | parsepart.offset += master->erasesize; |
| 195 | parsepart.size -= master->erasesize; |
| 196 | } while (parsepart.size >= master->erasesize); |
| 197 | } |
| 198 | linuxpartnum++; |
| 199 | } |
| 200 | |
| 201 | *pparts = ac49x_parts; |
| 202 | return linuxpartnum; |
| 203 | } |
| 204 | |
| 205 | static struct mtd_part_parser ac49x_parser = { |
| 206 | .owner = THIS_MODULE, |
| 207 | .parse_fn = create_mtd_partitions, |
| 208 | .name = "ac49xpart", |
| 209 | }; |
| 210 | |
| 211 | static int __init ac49x_parser_init(void) |
| 212 | { |
| 213 | return register_mtd_parser(&ac49x_parser); |
| 214 | } |
| 215 | |
| 216 | module_init(ac49x_parser_init); |
| 217 | |
| 218 | MODULE_LICENSE("GPL"); |
| 219 | MODULE_AUTHOR("Daniel Golle <daniel.golle@gmail.com>"); |
| 220 | MODULE_DESCRIPTION("MTD partitioning for AudioCodes AC49x"); |
| 221 | |
