[MTD] AR7 mtd partition map

Signed-off-by: Matteo Croce <technoboy85@gmail.com>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Eugene Konev <ejka@imfi.kspu.ru>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

1 files changed, 146 insertions, 0 deletions

diff --git a/drivers/mtd/ar7part.c b/drivers/mtd/ar7part.c
new file mode 100644
index 000000000000..7722608d5a83
--- /dev/null
+++ b/drivers/mtd/ar7part.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright © 2007 Eugene Konev <ejka@openwrt.org>
+ *
+ * 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
+ *
+ * TI AR7 flash partition table.
+ * Based on ar7 map by Felix Fietkau <nbd@openwrt.org>
+ *
+ */
+
+#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>
+
+#define AR7_PARTS       4
+#define ROOT_OFFSET     0xe0000
+
+#define LOADER_MAGIC1   le32_to_cpu(0xfeedfa42)
+#define LOADER_MAGIC2   le32_to_cpu(0xfeed1281)
+
+struct ar7_bin_rec {
+        unsigned int checksum;
+        unsigned int length;
+        unsigned int address;
+};
+
+static struct mtd_partition ar7_parts[AR7_PARTS];
+
+static int create_mtd_partitions(struct mtd_info *master,
+                                 struct mtd_partition **pparts,
+                                 unsigned long origin)
+{
+        struct ar7_bin_rec header;
+        unsigned int offset, len;
+        unsigned int pre_size = master->erasesize, post_size = 0;
+        unsigned int root_offset = ROOT_OFFSET;
+
+        int retries = 10;
+
+        ar7_parts[0].name = "loader";
+        ar7_parts[0].offset = 0;
+        ar7_parts[0].size = master->erasesize;
+        ar7_parts[0].mask_flags = MTD_WRITEABLE;
+
+        ar7_parts[1].name = "config";
+        ar7_parts[1].offset = 0;
+        ar7_parts[1].size = master->erasesize;
+        ar7_parts[1].mask_flags = 0;
+
+        do { /* Try 10 blocks starting from master->erasesize */
+                offset = pre_size;
+                master->read(master, offset,
+                        sizeof(header), &len, (u8 *)&header);
+                if (!strncmp((char *)&header, "TIENV0.8", 8))
+                        ar7_parts[1].offset = pre_size;
+                if (header.checksum == LOADER_MAGIC1)
+                        break;
+                if (header.checksum == LOADER_MAGIC2)
+                        break;
+                pre_size += master->erasesize;
+        } while (retries--);
+
+        pre_size = offset;
+
+        if (!ar7_parts[1].offset) {
+                ar7_parts[1].offset = master->size - master->erasesize;
+                post_size = master->erasesize;
+        }
+
+        switch (header.checksum) {
+        case LOADER_MAGIC1:
+                while (header.length) {
+                        offset += sizeof(header) + header.length;
+                        master->read(master, offset, sizeof(header),
+                                     &len, (u8 *)&header);
+                }
+                root_offset = offset + sizeof(header) + 4;
+                break;
+        case LOADER_MAGIC2:
+                while (header.length) {
+                        offset += sizeof(header) + header.length;
+                        master->read(master, offset, sizeof(header),
+                                     &len, (u8 *)&header);
+                }
+                root_offset = offset + sizeof(header) + 4 + 0xff;
+                root_offset &= ~(u32)0xff;
+                break;
+        default:
+                printk(KERN_WARNING "Unknown magic: %08x\n", header.checksum);
+                break;
+        }
+
+        master->read(master, root_offset,
+                sizeof(header), &len, (u8 *)&header);
+        if (header.checksum != SQUASHFS_MAGIC) {
+                root_offset += master->erasesize - 1;
+                root_offset &= ~(master->erasesize - 1);
+        }
+
+        ar7_parts[2].name = "linux";
+        ar7_parts[2].offset = pre_size;
+        ar7_parts[2].size = master->size - pre_size - post_size;
+        ar7_parts[2].mask_flags = 0;
+
+        ar7_parts[3].name = "rootfs";
+        ar7_parts[3].offset = root_offset;
+        ar7_parts[3].size = master->size - root_offset - post_size;
+        ar7_parts[3].mask_flags = 0;
+
+        *pparts = ar7_parts;
+        return AR7_PARTS;
+}
+
+static struct mtd_part_parser ar7_parser = {
+        .owner = THIS_MODULE,
+        .parse_fn = create_mtd_partitions,
+        .name = "ar7part",
+};
+
+static int __init ar7_parser_init(void)
+{
+        return register_mtd_parser(&ar7_parser);
+}
+
+module_init(ar7_parser_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR(  "Felix Fietkau <nbd@openwrt.org>, "
+                "Eugene Konev <ejka@openwrt.org>");
+MODULE_DESCRIPTION("MTD partitioning for TI AR7");