kernel: start working on 3.18 support

This commit:
1) Copies 3.14 patches
2) Drops mainlined stuff
3) Modifies some patches to apply

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 43093

1 files changed, 215 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch b/target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch
new file mode 100644
index 0000000000..6ec19b119b
--- /dev/null
+++ b/target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch
@@ -0,0 +1,215 @@
+--- a/drivers/mtd/Kconfig
++++ b/drivers/mtd/Kconfig
+@@ -12,6 +12,28 @@ menuconfig MTD
+ 
+ if MTD
+ 
++menu "OpenWrt specific MTD options"
++
++config MTD_ROOTFS_ROOT_DEV
++	bool "Automatically set 'rootfs' partition to be root filesystem"
++	default y
++
++config MTD_SPLIT_FIRMWARE
++	bool "Automatically split firmware partition for kernel+rootfs"
++	default y
++
++config MTD_SPLIT_FIRMWARE_NAME
++	string "Firmware partition name"
++	depends on MTD_SPLIT_FIRMWARE
++	default "firmware"
++
++config MTD_UIMAGE_SPLIT
++	bool "Enable split support for firmware partitions containing a uImage"
++	depends on MTD_SPLIT_FIRMWARE
++	default y
++
++endmenu
++
+ config MTD_TESTS
+ 	tristate "MTD tests support (DANGEROUS)"
+ 	depends on m
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -29,9 +29,11 @@
+ #include <linux/kmod.h>
+ #include <linux/mtd/mtd.h>
+ #include <linux/mtd/partitions.h>
++#include <linux/magic.h>
+ #include <linux/err.h>
+ 
+ #include "mtdcore.h"
++#include "mtdsplit.h"
+ 
+ /* Our partition linked list */
+ static LIST_HEAD(mtd_partitions);
+@@ -45,13 +47,14 @@ struct mtd_part {
+ 	struct list_head list;
+ };
+ 
++static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part);
++
+ /*
+  * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
+  * the pointer to that structure with this macro.
+  */
+ #define PART(x)  ((struct mtd_part *)(x))
+ 
+-
+ /*
+  * MTD methods which simply translate the effective address and pass through
+  * to the _real_ device.
+@@ -547,8 +550,10 @@ out_register:
+ 	return slave;
+ }
+ 
+-int mtd_add_partition(struct mtd_info *master, const char *name,
+-		      long long offset, long long length)
++
++static int
++__mtd_add_partition(struct mtd_info *master, const char *name,
++		    long long offset, long long length, bool dup_check)
+ {
+ 	struct mtd_partition part;
+ 	struct mtd_part *p, *new;
+@@ -580,21 +585,24 @@ int mtd_add_partition(struct mtd_info *m
+ 	end = offset + length;
+ 
+ 	mutex_lock(&mtd_partitions_mutex);
+-	list_for_each_entry(p, &mtd_partitions, list)
+-		if (p->master == master) {
+-			if ((start >= p->offset) &&
+-			    (start < (p->offset + p->mtd.size)))
+-				goto err_inv;
+-
+-			if ((end >= p->offset) &&
+-			    (end < (p->offset + p->mtd.size)))
+-				goto err_inv;
+-		}
++	if (dup_check) {
++		list_for_each_entry(p, &mtd_partitions, list)
++			if (p->master == master) {
++				if ((start >= p->offset) &&
++				    (start < (p->offset + p->mtd.size)))
++					goto err_inv;
++
++				if ((end >= p->offset) &&
++				    (end < (p->offset + p->mtd.size)))
++					goto err_inv;
++			}
++	}
+ 
+ 	list_add(&new->list, &mtd_partitions);
+ 	mutex_unlock(&mtd_partitions_mutex);
+ 
+ 	add_mtd_device(&new->mtd);
++	mtd_partition_split(master, new);
+ 
+ 	return ret;
+ err_inv:
+@@ -604,6 +612,12 @@ err_inv:
+ }
+ EXPORT_SYMBOL_GPL(mtd_add_partition);
+ 
++int mtd_add_partition(struct mtd_info *master, const char *name,
++		      long long offset, long long length)
++{
++	return __mtd_add_partition(master, name, offset, length, true);
++}
++
+ int mtd_del_partition(struct mtd_info *master, int partno)
+ {
+ 	struct mtd_part *slave, *next;
+@@ -627,6 +641,74 @@ int mtd_del_partition(struct mtd_info *m
+ }
+ EXPORT_SYMBOL_GPL(mtd_del_partition);
+ 
++static inline unsigned long
++mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len)
++{
++	unsigned long mask = mtd->erasesize - 1;
++
++	len += offset & mask;
++	len = (len + mask) & ~mask;
++	len -= offset & mask;
++	return len;
++}
++
++#define UBOOT_MAGIC	0x27051956
++
++static void split_uimage(struct mtd_info *master, struct mtd_part *part)
++{
++	struct {
++		__be32 magic;
++		__be32 pad[2];
++		__be32 size;
++	} hdr;
++	size_t len;
++
++	if (mtd_read(master, part->offset, sizeof(hdr), &len, (void *) &hdr))
++		return;
++
++	if (len != sizeof(hdr) || hdr.magic != cpu_to_be32(UBOOT_MAGIC))
++		return;
++
++	len = be32_to_cpu(hdr.size) + 0x40;
++	len = mtd_pad_erasesize(master, part->offset, len);
++	if (len + master->erasesize > part->mtd.size)
++		return;
++
++	__mtd_add_partition(master, "rootfs", part->offset + len,
++			    part->mtd.size - len, false);
++}
++
++#ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
++#define SPLIT_FIRMWARE_NAME	CONFIG_MTD_SPLIT_FIRMWARE_NAME
++#else
++#define SPLIT_FIRMWARE_NAME	"unused"
++#endif
++
++static void split_firmware(struct mtd_info *master, struct mtd_part *part)
++{
++	if (config_enabled(CONFIG_MTD_UIMAGE_SPLIT))
++		split_uimage(master, part);
++}
++
++void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
++                                int offset, int size)
++{
++}
++
++static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part)
++{
++	static int rootfs_found = 0;
++
++	if (rootfs_found)
++		return;
++
++	if (!strcmp(part->mtd.name, SPLIT_FIRMWARE_NAME) &&
++	    config_enabled(CONFIG_MTD_SPLIT_FIRMWARE))
++		split_firmware(master, part);
++
++	arch_split_mtd_part(master, part->mtd.name, part->offset,
++			    part->mtd.size);
++}
+ /*
+  * This function, given a master MTD object and a partition table, creates
+  * and registers slave MTD objects which are bound to the master according to
+@@ -656,6 +738,7 @@ int add_mtd_partitions(struct mtd_info *
+ 		mutex_unlock(&mtd_partitions_mutex);
+ 
+ 		add_mtd_device(&slave->mtd);
++		mtd_partition_split(master, slave);
+ 
+ 		cur_offset = slave->offset + slave->mtd.size;
+ 	}
+--- a/include/linux/mtd/partitions.h
++++ b/include/linux/mtd/partitions.h
+@@ -84,5 +84,7 @@ int mtd_add_partition(struct mtd_info *m
+ 		      long long offset, long long length);
+ 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,
++				       const char *name, int offset, int size);
+ 
+ #endif