mac80211: rt2x00: add mtd-eeprom swab function

Most of the lantiq devices with ralink wifi have the EEPROM stored
in big endian byte order in flash, but the driver expects the EEPROM to
be in little endian.

Signed-off-by: Mathias Kresin <dev@kresin.me>

package/kernel/mac80211/patches/605-rt2x00-load-eeprom-on-SoC-from-a-mtd-device-defines-.patch

@@ -7,8 +7,8 @@ Subject: [PATCH] rt2x00: load eeprom on SoC from a mtd device defines inside
 Signed-off-by: John Crispin <blogic@openwrt.org>
 ---
  drivers/net/wireless/ralink/rt2x00/Kconfig        |  1 +
- drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c | 61 +++++++++++++++++++++++
- 2 files changed, 62 insertions(+)
+ drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c | 65 +++++++++++++++++++++++
+ 2 files changed, 66 insertions(+)
 
 --- a/drivers/net/wireless/ralink/rt2x00/Kconfig
 +++ b/drivers/net/wireless/ralink/rt2x00/Kconfig
@@ -22,7 +22,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
  	  Supported chips: RT2880, RT3050, RT3052, RT3350, RT3352.
 --- a/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
 +++ b/drivers/net/wireless/ralink/rt2x00/rt2x00eeprom.c
-@@ -26,11 +26,69 @@
+@@ -26,11 +26,73 @@
  
  #include <linux/kernel.h>
  #include <linux/module.h>
@@ -40,7 +40,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 +	static struct firmware mtd_fw;
 +	struct device_node *np = rt2x00dev->dev->of_node, *mtd_np = NULL;
 +	size_t retlen, len = rt2x00dev->ops->eeprom_size;
-+	int size, offset = 0;
++	int i, size, offset = 0;
 +	struct mtd_info *mtd;
 +	const char *part;
 +	const __be32 *list;
@@ -79,6 +79,10 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
 +		return ret;
 +	}
 +
++	if (of_find_property(np, "ralink,mtd-eeprom-swap", NULL))
++		for (i = 0; i < len/sizeof(u16); i++)
++			rt2x00dev->eeprom[i] = swab16(rt2x00dev->eeprom[i]);
++
 +	rt2x00dev->eeprom_file = &mtd_fw;
 +	mtd_fw.size = len;
 +	mtd_fw.data = (const u8 *) rt2x00dev->eeprom;
@@ -92,7 +96,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
  static const char *
  rt2x00lib_get_eeprom_file_name(struct rt2x00_dev *rt2x00dev)
  {
-@@ -58,6 +116,9 @@ static int rt2x00lib_request_eeprom_file
+@@ -58,6 +120,9 @@ static int rt2x00lib_request_eeprom_file
  	const char *ee_name;
  	int retval;