ar71xx: Add kernel 4.9 support

This add support for kernel 4.9 to the ar71xx target.
It was compile tested with the generic, NAND and mikrotik subtarget.
Multiple members of the community tested it on their boards and did not
report any major problem so far.

Especially the NAND part received some changes to adapt to the new
kernel APIs. The serial driver hack used for the Arduino Yun was not
ported because the kernel changed there a lot.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 94 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-4.9/401-mtd-physmap-add-lock-unlock.patch b/target/linux/ar71xx/patches-4.9/401-mtd-physmap-add-lock-unlock.patch
new file mode 100644
index 0000000000..db7b3ca83d
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.9/401-mtd-physmap-add-lock-unlock.patch
@@ -0,0 +1,94 @@
+--- a/drivers/mtd/maps/physmap.c
++++ b/drivers/mtd/maps/physmap.c
+@@ -31,6 +31,66 @@ struct physmap_flash_info {
+ 	int			vpp_refcnt;
+ };
+ 
++static struct platform_device *physmap_map2pdev(struct map_info *map)
++{
++	return (struct platform_device *) map->map_priv_1;
++}
++
++static void physmap_lock(struct map_info *map)
++{
++	struct platform_device *pdev;
++	struct physmap_flash_data *physmap_data;
++
++	pdev = physmap_map2pdev(map);
++	physmap_data = pdev->dev.platform_data;
++	physmap_data->lock(pdev);
++}
++
++static void physmap_unlock(struct map_info *map)
++{
++	struct platform_device *pdev;
++	struct physmap_flash_data *physmap_data;
++
++	pdev = physmap_map2pdev(map);
++	physmap_data = pdev->dev.platform_data;
++	physmap_data->unlock(pdev);
++}
++
++static map_word physmap_flash_read_lock(struct map_info *map, unsigned long ofs)
++{
++	map_word ret;
++
++	physmap_lock(map);
++	ret = inline_map_read(map, ofs);
++	physmap_unlock(map);
++
++	return ret;
++}
++
++static void physmap_flash_write_lock(struct map_info *map, map_word d,
++				     unsigned long ofs)
++{
++	physmap_lock(map);
++	inline_map_write(map, d, ofs);
++	physmap_unlock(map);
++}
++
++static void physmap_flash_copy_from_lock(struct map_info *map, void *to,
++					 unsigned long from, ssize_t len)
++{
++	physmap_lock(map);
++	inline_map_copy_from(map, to, from, len);
++	physmap_unlock(map);
++}
++
++static void physmap_flash_copy_to_lock(struct map_info *map, unsigned long to,
++				       const void *from, ssize_t len)
++{
++	physmap_lock(map);
++	inline_map_copy_to(map, to, from, len);
++	physmap_unlock(map);
++}
++
+ static int physmap_flash_remove(struct platform_device *dev)
+ {
+ 	struct physmap_flash_info *info;
+@@ -153,6 +213,13 @@ static int physmap_flash_probe(struct pl
+ 
+ 		simple_map_init(&info->map[i]);
+ 
++		if (physmap_data->lock && physmap_data->unlock) {
++			info->map[i].read = physmap_flash_read_lock;
++			info->map[i].write = physmap_flash_write_lock;
++			info->map[i].copy_from = physmap_flash_copy_from_lock;
++			info->map[i].copy_to = physmap_flash_copy_to_lock;
++		}
++
+ 		probe_type = rom_probe_types;
+ 		if (physmap_data->probe_type == NULL) {
+ 			for (; info->mtd[i] == NULL && *probe_type != NULL; probe_type++)
+--- a/include/linux/mtd/physmap.h
++++ b/include/linux/mtd/physmap.h
+@@ -25,6 +25,8 @@ struct physmap_flash_data {
+ 	unsigned int		width;
+ 	int			(*init)(struct platform_device *);
+ 	void			(*exit)(struct platform_device *);
++	void			(*lock)(struct platform_device *);
++	void			(*unlock)(struct platform_device *);
+ 	void			(*set_vpp)(struct platform_device *, int);
+ 	unsigned int		nr_parts;
+ 	unsigned int		pfow_base;