#define AR9170_MAC_REG_TX_BLOCKACKS (AR9170_MAC_REG_BASE + 0x6c0)
#define AR9170_MAC_REG_NAV_COUNT (AR9170_MAC_REG_BASE + 0x6c4)
#define AR9170_MAC_REG_BACKOFF_STATUS (AR9170_MAC_REG_BASE + 0x6c8)
+#define AR9170_MAC_BACKOFF_CCA BIT(24)
+#define AR9170_MAC_BACKOFF_TX_PEX BIT(25)
+#define AR9170_MAC_BACKOFF_RX_PE BIT(26)
+#define AR9170_MAC_BACKOFF_MD_READY BIT(27)
+#define AR9170_MAC_BACKOFF_TX_PE BIT(28)
+
#define AR9170_MAC_REG_TX_RETRY (AR9170_MAC_REG_BASE + 0x6cc)
#define AR9170_MAC_REG_TX_COMPLETE (AR9170_MAC_REG_BASE + 0x6d4)