rt2x00: add RT3883 support

Patch add support for RT3883 chip. Code was taken direclty
from openwrt project and merge into one patch.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ralink/rt2x00/rt2800.h

@@ -48,7 +48,8 @@
  * RF2853 2.4G/5G 3T3R
  * RF3320 2.4G 1T1R(RT3350/RT3370/RT3390)
  * RF3322 2.4G 2T2R(RT3352/RT3371/RT3372/RT3391/RT3392)
- * RF3053 2.4G/5G 3T3R(RT3883/RT3563/RT3573/RT3593/RT3662)
+ * RF3053 2.4G/5G 3T3R(RT3563/RT3573/RT3593)
+ * RF3853 2.4G/5G 3T3R(RT3883/RT3662)
  * RF5592 2.4G/5G 2T2R
  * RF3070 2.4G 1T1R
  * RF5360 2.4G 1T1R
@@ -72,6 +73,7 @@
 #define RF5592				0x000f
 #define RF3070				0x3070
 #define RF3290				0x3290
+#define RF3853				0x3853
 #define RF5350				0x5350
 #define RF5360				0x5360
 #define RF5362				0x5362
@@ -1725,6 +1727,20 @@
 /* bits for new 2T devices */
 #define TX_PWR_CFG_9B_STBC_MCS7		FIELD32(0x000000ff)
 
+/*
+ * TX_TXBF_CFG:
+ */
+#define TX_TXBF_CFG_0			0x138c
+#define TX_TXBF_CFG_1			0x13a4
+#define TX_TXBF_CFG_2			0x13a8
+#define TX_TXBF_CFG_3			0x13ac
+
+/*
+ * TX_FBK_CFG_3S:
+ */
+#define TX_FBK_CFG_3S_0			0x13c4
+#define TX_FBK_CFG_3S_1			0x13c8
+
 /*
  * RX_FILTER_CFG: RX configuration register.
  */
@@ -2296,6 +2312,7 @@ struct mac_iveiv_entry {
 /*
  * RFCSR 2:
  */
+#define RFCSR2_RESCAL_BP		FIELD8(0x40)
 #define RFCSR2_RESCAL_EN		FIELD8(0x80)
 #define RFCSR2_RX2_EN_MT7620		FIELD8(0x02)
 #define RFCSR2_TX2_EN_MT7620		FIELD8(0x20)