--- /dev/null
+/*
+ * 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");
projects / openwrt / svn-archive / archive.git / blobdiff