ath9k_hw: Add hardware code for WoW

add a new file wow.c which takes care of the hardware code
for WoW.

*program the descriptors and data words to periodically
send Keep Alive Frames.
*program the user defined patterns/masks and pattern length
in the hardware registers.
*'ath9k_hw_wow_enable' is called during the drivers suspend
callback which takes care of the following
	- tracking wow event mask (to suppress spurious
	  wow events)
	- properly configure suspend/resume WAR registers
	- configure PCIE PM control register
	- configure MAC WoW registers and their timeouts
	- enabling wow configuration like magic packet,
	  user patterns based on users configuration
	- configuring timeouts for KAL, beacon miss,
	  aifs, slot time, backoff
	- create Keep Alive Pattern ('KAL')
*'ath9k_hw_wow_wakeup' is called during the drivers resume
callback which takes care of the following
	- primary task is to find the reason for wakeup
	  from the wow status register
	- configure/restore AR_PCIE_PM_CTRL register
	- clear all WoW events
	- configure/restore suspend/resume WAR registers

Cc: Senthil Balasubramanian <senthilb@qca.qualcomm.com>
Cc: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Cc: vadivel@qca.qualcomm.com
Signed-off-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ath9k/Makefile

@@ -17,6 +17,7 @@ ath9k-$(CONFIG_ATH9K_DFS_CERTIFIED) += \
 		dfs.o \
 		dfs_pattern_detector.o \
 		dfs_pri_detector.o
+ath9k-$(CONFIG_PM_SLEEP) += wow.o
 
 obj-$(CONFIG_ATH9K) += ath9k.o
 

drivers/net/wireless/ath/ath9k/hw.h

@@ -1112,6 +1112,37 @@ ath9k_hw_get_btcoex_scheme(struct ath_hw *ah)
 }
 #endif /* CONFIG_ATH9K_BTCOEX_SUPPORT */
 
+
+#ifdef CONFIG_PM_SLEEP
+const char *ath9k_hw_wow_event_to_string(u32 wow_event);
+void ath9k_hw_wow_apply_pattern(struct ath_hw *ah, u8 *user_pattern,
+				u8 *user_mask, int pattern_count,
+				int pattern_len);
+u32 ath9k_hw_wow_wakeup(struct ath_hw *ah);
+void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable);
+#else
+static inline const char *ath9k_hw_wow_event_to_string(u32 wow_event)
+{
+	return NULL;
+}
+static inline void ath9k_hw_wow_apply_pattern(struct ath_hw *ah,
+					      u8 *user_pattern,
+					      u8 *user_mask,
+					      int pattern_count,
+					      int pattern_len)
+{
+}
+static inline u32 ath9k_hw_wow_wakeup(struct ath_hw *ah)
+{
+	return 0;
+}
+static inline void ath9k_hw_wow_enable(struct ath_hw *ah, u32 pattern_enable)
+{
+}
+#endif
+
+
+
 #define ATH9K_CLOCK_RATE_CCK		22
 #define ATH9K_CLOCK_RATE_5GHZ_OFDM	40
 #define ATH9K_CLOCK_RATE_2GHZ_OFDM	44