diff options
Diffstat (limited to 'target/linux/ar7/files/drivers/mtd')
| -rw-r--r-- | target/linux/ar7/files/drivers/mtd/ac49xpart.c | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/target/linux/ar7/files/drivers/mtd/ac49xpart.c b/target/linux/ar7/files/drivers/mtd/ac49xpart.c new file mode 100644 index 0000000..1f937f0 --- /dev/null +++ b/target/linux/ar7/files/drivers/mtd/ac49xpart.c @@ -0,0 +1,220 @@ +/* + * AudioCodes AC49x PSPBoot-based flash partition table + * Copyright 2012 Daniel Golle <daniel.golle@gmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include <linux/kernel.h> +#include <linux/slab.h> + +#include <linux/mtd/mtd.h> +#include <linux/mtd/partitions.h> +#include <linux/bootmem.h> +#include <linux/magic.h> +#include <linux/module.h> + +#include <asm/mach-ar7/prom.h> + +#define AC49X_MAXENVPARTS 8 + +#define AC49X_PARTTYPE_LOADER 0 +#define AC49X_PARTTYPE_BOOTENV 1 +#define AC49X_PARTTYPE_LINUX 2 +#define AC49X_PARTTYPE_ROOTFS 3 +#define AC49X_PARTTYPE_UNKNOWN 4 +#define AC49X_NUM_PARTTYPES 5 + +#define AC49X_FLASH_ADDRMASK 0x00FFFFFF + +#define AC49X_LOADER_MAGIC 0x40809000 +#define AC49X_LINUX_MAGIC 0x464c457f /* ELF */ +#define AC49X_BOOTENV_MAGIC 0x4578614d /* MaxE */ + +#define ROOTFS_MIN_OFFSET 0xC0000 + +int parse_partvar(const unsigned char *partvar, struct mtd_partition *part) +{ + unsigned int partstart, partend; + unsigned int pnum; + + pnum = sscanf(partvar, "0x%x,0x%x", &partstart, &partend); + if (pnum != 2) + return 1; + + part->offset = partstart & AC49X_FLASH_ADDRMASK; + part->size = partend - partstart; + + return 0; +} + +int detect_parttype(struct mtd_info *master, struct mtd_partition part) +{ + unsigned int magic; + size_t len; + + if (part.size < 4) + return -1; + + mtd_read(master, part.offset, sizeof(magic), &len, + (uint8_t *)&magic); + + if (len != sizeof(magic)) + return -1; + + switch (magic) { + case AC49X_LOADER_MAGIC: + return AC49X_PARTTYPE_LOADER; + case AC49X_LINUX_MAGIC: + return AC49X_PARTTYPE_LINUX; + case SQUASHFS_MAGIC: + case CRAMFS_MAGIC: + case CRAMFS_MAGIC_WEND: + return AC49X_PARTTYPE_ROOTFS; + case AC49X_BOOTENV_MAGIC: + return AC49X_PARTTYPE_BOOTENV; + default: + switch (magic & 0xFF) { + case JFFS2_SUPER_MAGIC: + return AC49X_PARTTYPE_ROOTFS; + } + switch (magic >> 8) { + case JFFS2_SUPER_MAGIC: + return AC49X_PARTTYPE_ROOTFS; + } + return AC49X_PARTTYPE_UNKNOWN; + } +} + +const char *partnames[] = { + "loader", + "config", + "linux", + "rootfs", + "data" +}; + +void gen_partname(unsigned int type, + unsigned int *typenumeration, + struct mtd_partition *part) +{ + char *s = kzalloc(sizeof(char) * 8, GFP_KERNEL); + + (typenumeration[type])++; + if (typenumeration[type] == 1) + sprintf(s, "%s", partnames[type]); + else + sprintf(s, "%s%d", partnames[type], typenumeration[type]); + + part->name = s; +} + +static int create_mtd_partitions(struct mtd_info *master, + struct mtd_partition **pparts, + struct mtd_part_parser_data *data) +{ + unsigned int envpartnum = 0, linuxpartnum = 0; + unsigned int typenumeration[5] = { 0, 0, 0, 0, 0 }; + unsigned char evn[5]; + const unsigned char *partvar = NULL; + + struct mtd_partition *ac49x_parts; + + ac49x_parts = kzalloc(sizeof(*ac49x_parts) * AC49X_MAXENVPARTS, + GFP_KERNEL); + + if (!ac49x_parts) + return -ENOMEM; + + linuxpartnum = 0; + for (envpartnum = 0; envpartnum < AC49X_MAXENVPARTS; envpartnum++) { + struct mtd_partition parsepart; + unsigned int offset, size, type; + int err; + sprintf(evn, "mtd%d", envpartnum); + partvar = prom_getenv(evn); + if (!partvar) + continue; + err = parse_partvar(partvar, &parsepart); + if (err) + continue; + offset = parsepart.offset; + size = parsepart.size; + type = detect_parttype(master, parsepart); + gen_partname(type, typenumeration, &parsepart); + /* protect loader */ + if (type == AC49X_PARTTYPE_LOADER) + parsepart.mask_flags = MTD_WRITEABLE; + else + parsepart.mask_flags = 0; + + memcpy(&(ac49x_parts[linuxpartnum]), &parsepart, + sizeof(struct mtd_partition)); + + /* scan for contained rootfs */ + if (type == AC49X_PARTTYPE_LINUX) { + parsepart.offset += ROOTFS_MIN_OFFSET & + ~(master->erasesize - 1); + parsepart.size -= ROOTFS_MIN_OFFSET & + ~(master->erasesize - 1); + do { + unsigned int size, offset; + size = parsepart.size; + offset = parsepart.offset; + + type = detect_parttype(master, parsepart); + if (type == AC49X_PARTTYPE_ROOTFS) { + gen_partname(type, typenumeration, + &parsepart); + printk(KERN_INFO + "%s %s: 0x%08x@0x%08x\n", + "detected sub-partition", + parsepart.name, + (unsigned int)parsepart.size, + (unsigned int)parsepart.offset); + linuxpartnum++; + memcpy(&(ac49x_parts[linuxpartnum]), + &parsepart, + sizeof(struct mtd_partition)); + break; + } + parsepart.offset += master->erasesize; + parsepart.size -= master->erasesize; + } while (parsepart.size >= master->erasesize); + } + linuxpartnum++; + } + + *pparts = ac49x_parts; + return linuxpartnum; +} + +static struct mtd_part_parser ac49x_parser = { + .owner = THIS_MODULE, + .parse_fn = create_mtd_partitions, + .name = "ac49xpart", +}; + +static int __init ac49x_parser_init(void) +{ + return register_mtd_parser(&ac49x_parser); +} + +module_init(ac49x_parser_init); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Daniel Golle <daniel.golle@gmail.com>"); +MODULE_DESCRIPTION("MTD partitioning for AudioCodes AC49x"); |