openwrtv4/target/linux/lantiq/patches-3.10/0100-mtd-split.patch

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Index: linux-3.10.12/arch/mips/lantiq/xway/Makefile
===================================================================
--- linux-3.10.12.orig/arch/mips/lantiq/xway/Makefile 2013-09-17 22:32:50.389021711 +0200
+++ linux-3.10.12/arch/mips/lantiq/xway/Makefile 2013-09-17 23:04:39.829103336 +0200
@@ -1,6 +1,6 @@
obj-y := prom.o sysctrl.o clk.o reset.o dma.o gptu.o dcdc.o
-obj-y += vmmc.o
+obj-y += vmmc.o mtd_split.o
obj-$(CONFIG_PCI) += ath_eep.o rt_eep.o pci-ath-fixup.o
Index: linux-3.10.12/arch/mips/lantiq/xway/mtd_split.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ linux-3.10.12/arch/mips/lantiq/xway/mtd_split.c 2013-09-17 22:42:28.485046424 +0200
@@ -0,0 +1,151 @@
+#include <linux/magic.h>
+#include <linux/root_dev.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#define ROOTFS_SPLIT_NAME "rootfs_data"
+
+struct squashfs_super_block {
+ __le32 s_magic;
+ __le32 pad0[9];
+ __le64 bytes_used;
+};
+
+static void split_brnimage_kernel(struct mtd_info *master, const char *name,
+ int offset, int size)
+{
+ unsigned long buf[4];
+ // Assume at most 2MB of kernel image
+ unsigned long end = offset + (2 << 20);
+ unsigned long part_size = offset + 0x400 - 12;
+ size_t len;
+ int ret;
+
+ if (strcmp(name, "rootfs") != 0)
+ return;
+ while (part_size < end) {
+ long size_min = part_size - 0x400 - 12 - offset;
+ long size_max = part_size + 12 - offset;
+ ret = mtd_read(master, part_size, 16, &len, (void *)buf);
+ if (ret || len != 16)
+ return;
+
+ if (le32_to_cpu(buf[0]) < size_min ||
+ le32_to_cpu(buf[0]) > size_max) {
+ part_size += 0x400;
+ continue;
+ }
+
+ if (le32_to_cpu(buf[3]) == SQUASHFS_MAGIC) {
+ part_size += 12 - offset;
+ __mtd_add_partition(master, "rootfs", offset + part_size,
+ size - part_size, false);
+ return;
+ }
+ part_size += 0x400;
+ }
+}
+
+static void split_eva_kernel(struct mtd_info *master, const char *name,
+ int offset, int size)
+{
+#define EVA_MAGIC 0xfeed1281
+ unsigned long magic = 0;
+ unsigned long part_size = 0;
+ size_t len;
+ int ret;
+
+ if (strcmp(name, CONFIG_MTD_SPLIT_FIRMWARE_NAME) != 0)
+ return;
+
+ ret = mtd_read(master, offset, 4, &len, (void *)&magic);
+ if (ret || len != sizeof(magic))
+ return;
+
+ if (le32_to_cpu(magic) != EVA_MAGIC)
+ return;
+
+ ret = mtd_read(master, offset + 4, 4, &len, (void *)&part_size);
+ if (ret || len != sizeof(part_size))
+ return;
+
+ part_size = le32_to_cpu(part_size) + 0x18;
+ part_size = mtd_pad_erasesize(master, offset, len);
+ if (part_size + master->erasesize > size)
+ return;
+
+ __mtd_add_partition(master, "rootfs", offset + part_size,
+ size - part_size, false);
+}
+
+static void split_tplink_kernel(struct mtd_info *master, const char *name,
+ int offset, int size)
+{
+#define TPLINK_MAGIC 0x00000002
+ unsigned long magic = 0;
+ unsigned long part_size = 0;
+ size_t len;
+ int ret;
+
+ if (strcmp(name, CONFIG_MTD_SPLIT_FIRMWARE_NAME) != 0)
+ return;
+
+ ret = mtd_read(master, offset, 4, &len, (void *)&magic);
+ if (ret || len != sizeof(magic))
+ return;
+
+ if (le32_to_cpu(magic) != TPLINK_MAGIC)
+ return;
+
+ ret = mtd_read(master, offset + 0x78, 4, &len, (void *)&part_size);
+ if (ret || len != sizeof(part_size))
+ return;
+
+ part_size = be32_to_cpu(part_size) + 0x200;
+ if (part_size + master->erasesize > size)
+ return;
+
+ __mtd_add_partition(master, "rootfs", offset + part_size,
+ size - part_size, false);
+}
+
+static void split_squashfs(struct mtd_info *master, const char *name,
+ int offset, int size)
+{
+ struct squashfs_super_block sb;
+ int len, ret;
+
+ offset += 0x100;
+ size -= 0x100;
+
+ ret = mtd_read(master, offset, sizeof(sb), &len, (void *) &sb);
+ if (ret || (len != sizeof(sb)))
+ return;
+
+ if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) )
+ return;
+
+ if (le64_to_cpu((sb.bytes_used)) <= 0)
+ printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
+ master->name);
+ return;
+
+ len = (u32) le64_to_cpu(sb.bytes_used);
+ len = mtd_pad_erasesize(master, offset, len);
+ offset += len;
+ size -= len ;
+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=0x%x, len=0x%x\n",
+ ROOTFS_SPLIT_NAME, offset, size);
+
+ __mtd_add_partition(master, ROOTFS_SPLIT_NAME, offset,
+ size, false);
+}
+
+void arch_split_mtd_part(struct mtd_info *master, const char *name,
+ int offset, int size)
+{
+ split_tplink_kernel(master, name, offset, size);
+ split_eva_kernel(master, name, offset, size);
+ split_brnimage_kernel(master, name, offset, size);
+ split_squashfs(master, name, offset, size);
+}
Index: linux-3.10.12/include/linux/mtd/partitions.h
===================================================================
--- linux-3.10.12.orig/include/linux/mtd/partitions.h 2013-09-17 22:32:46.925021563 +0200
+++ linux-3.10.12/include/linux/mtd/partitions.h 2013-09-17 22:32:51.049021740 +0200
@@ -82,9 +82,14 @@
int mtd_is_partition(const struct mtd_info *mtd);
int mtd_add_partition(struct mtd_info *master, char *name,
long long offset, long long length);
+int __mtd_add_partition(struct mtd_info *master, char *name,
+ long long offset, long long length, bool dup_check);
+
int mtd_del_partition(struct mtd_info *master, int partno);
uint64_t mtd_get_device_size(const struct mtd_info *mtd);
-extern void __weak arch_split_mtd_part(struct mtd_info *master,
+void __weak arch_split_mtd_part(struct mtd_info *master,
const char *name, int offset, int size);
+unsigned long
+mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len);
#endif
Index: linux-3.10.12/drivers/mtd/mtdpart.c
===================================================================
--- linux-3.10.12.orig/drivers/mtd/mtdpart.c 2013-09-17 22:32:46.973021565 +0200
+++ linux-3.10.12/drivers/mtd/mtdpart.c 2013-09-17 22:32:51.049021740 +0200
@@ -617,7 +617,7 @@
}
-static int
+int
__mtd_add_partition(struct mtd_info *master, char *name,
long long offset, long long length, bool dup_check)
{
@@ -707,7 +707,7 @@
}
EXPORT_SYMBOL_GPL(mtd_del_partition);
-static inline unsigned long
+unsigned long
mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len)
{
unsigned long mask = mtd->erasesize - 1;
@@ -799,7 +799,6 @@
return;
len = be32_to_cpu(hdr.size) + 0x40;
- len = mtd_pad_erasesize(master, part->offset, len);
if (len + master->erasesize > part->mtd.size)
return;