ath9k: remove (u16) casts from rtc register access

The RTC register offsets don't fit into 'u16' on the AR913x, so we have
to remove the existing casts.

Changes-licensed-under: ISC

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Tested-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath9k/hw.c b/drivers/net/wireless/ath9k/hw.c
index 55ed083..ed731b9 100644
--- a/drivers/net/wireless/ath9k/hw.c
+++ b/drivers/net/wireless/ath9k/hw.c
@@ -1011,7 +1011,7 @@
 				pll |= SM(0xb, AR_RTC_PLL_DIV);
 		}
 	}
-	REG_WRITE(ah, (u16) (AR_RTC_PLL_CONTROL), pll);
+	REG_WRITE(ah, AR_RTC_PLL_CONTROL, pll);
 
 	udelay(RTC_PLL_SETTLE_DELAY);
 
@@ -1550,11 +1550,11 @@
 			rst_flags |= AR_RTC_RC_MAC_COLD;
 	}
 
-	REG_WRITE(ah, (u16) (AR_RTC_RC), rst_flags);
+	REG_WRITE(ah, AR_RTC_RC, rst_flags);
 	udelay(50);
 
-	REG_WRITE(ah, (u16) (AR_RTC_RC), 0);
-	if (!ath9k_hw_wait(ah, (u16) (AR_RTC_RC), AR_RTC_RC_M, 0)) {
+	REG_WRITE(ah, AR_RTC_RC, 0);
+	if (!ath9k_hw_wait(ah, AR_RTC_RC, AR_RTC_RC_M, 0)) {
 		DPRINTF(ah->ah_sc, ATH_DBG_RESET,
 			"RTC stuck in MAC reset\n");
 		return false;
@@ -1576,8 +1576,8 @@
 	REG_WRITE(ah, AR_RTC_FORCE_WAKE, AR_RTC_FORCE_WAKE_EN |
 		  AR_RTC_FORCE_WAKE_ON_INT);
 
-	REG_WRITE(ah, (u16) (AR_RTC_RESET), 0);
-	REG_WRITE(ah, (u16) (AR_RTC_RESET), 1);
+	REG_WRITE(ah, AR_RTC_RESET, 0);
+	REG_WRITE(ah, AR_RTC_RESET, 1);
 
 	if (!ath9k_hw_wait(ah,
 			   AR_RTC_STATUS,
@@ -2619,7 +2619,7 @@
 		if (!AR_SREV_9100(ah))
 			REG_WRITE(ah, AR_RC, AR_RC_AHB | AR_RC_HOSTIF);
 
-		REG_CLR_BIT(ah, (u16) (AR_RTC_RESET),
+		REG_CLR_BIT(ah, (AR_RTC_RESET),
 			    AR_RTC_RESET_EN);
 	}
 }