[MTD] AR7 mtd partition map
Linux-MTD Mailing List
linux-mtd at lists.infradead.org
Tue Apr 22 15:59:01 EDT 2008
Gitweb: http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=f0797881d59ab93d7d92c55411e0573977d909d4
Commit: f0797881d59ab93d7d92c55411e0573977d909d4
Parent: 5c249c5a57dce2b47f1fb92093201b3a7013cb57
Author: Matteo Croce <technoboy85 at gmail.com>
AuthorDate: Wed Mar 12 02:25:06 2008 +0100
Committer: David Woodhouse <dwmw2 at infradead.org>
CommitDate: Tue Apr 22 20:48:12 2008 +0100
[MTD] AR7 mtd partition map
Signed-off-by: Matteo Croce <technoboy85 at gmail.com>
Signed-off-by: Felix Fietkau <nbd at openwrt.org>
Signed-off-by: Eugene Konev <ejka at imfi.kspu.ru>
Signed-off-by: David Woodhouse <dwmw2 at infradead.org>
---
drivers/mtd/Kconfig | 6 ++
drivers/mtd/Makefile | 1 +
drivers/mtd/ar7part.c | 146 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 153 insertions(+), 0 deletions(-)
diff --git a/drivers/mtd/Kconfig b/drivers/mtd/Kconfig
index e850334..eed06d0 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -158,6 +158,12 @@ config MTD_OF_PARTS
the partition map from the children of the flash node,
as described in Documentation/powerpc/booting-without-of.txt.
+config MTD_AR7_PARTS
+ tristate "TI AR7 partitioning support"
+ depends on MTD_PARTITIONS
+ ---help---
+ TI AR7 partitioning support
+
comment "User Modules And Translation Layers"
config MTD_CHAR
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index 538e33d..4b77335 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -11,6 +11,7 @@ obj-$(CONFIG_MTD_CONCAT) += mtdconcat.o
obj-$(CONFIG_MTD_REDBOOT_PARTS) += redboot.o
obj-$(CONFIG_MTD_CMDLINE_PARTS) += cmdlinepart.o
obj-$(CONFIG_MTD_AFS_PARTS) += afs.o
+obj-$(CONFIG_MTD_AR7_PARTS) += ar7part.o
obj-$(CONFIG_MTD_OF_PARTS) += ofpart.o
# 'Users' - code which presents functionality to userspace.
diff --git a/drivers/mtd/ar7part.c b/drivers/mtd/ar7part.c
new file mode 100644
index 0000000..7722608
--- /dev/null
+++ b/drivers/mtd/ar7part.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright © 2007 Eugene Konev <ejka at 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 at 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 at openwrt.org>, "
+ "Eugene Konev <ejka at openwrt.org>");
+MODULE_DESCRIPTION("MTD partitioning for TI AR7");
More information about the linux-mtd-cvs
mailing list