wifi: rtw89: mac: add function to get TSF

Add mac function rtw89_mac_port_get_tsf() to get TSF by port.
It will be used when MCC (multi-channel concurrency) calculates
timing things.
Signed-off-by: Zong-Zhe Yang <kevin_yang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230119062453.58341-4-pkshih@realtek.com

drivers/net/wireless/realtek/rtw89/mac.c

@@ -4061,6 +4061,24 @@ int rtw89_mac_port_update(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif)
 	return 0;
 }
 
+int rtw89_mac_port_get_tsf(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif,
+			   u64 *tsf)
+{
+	const struct rtw89_port_reg *p = &rtw_port_base;
+	u32 tsf_low, tsf_high;
+	int ret;
+
+	ret = rtw89_mac_check_mac_en(rtwdev, rtwvif->mac_idx, RTW89_CMAC_SEL);
+	if (ret)
+		return ret;
+
+	tsf_low = rtw89_read32_port(rtwdev, rtwvif, p->tsftr_l);
+	tsf_high = rtw89_read32_port(rtwdev, rtwvif, p->tsftr_h);
+	*tsf = (u64)tsf_high << 32 | tsf_low;
+
+	return 0;
+}
+
 static void rtw89_mac_check_he_obss_narrow_bw_ru_iter(struct wiphy *wiphy,
 						      struct cfg80211_bss *bss,
 						      void *data)

drivers/net/wireless/realtek/rtw89/mac.h

@@ -827,6 +827,15 @@ static inline u32 rtw89_mac_reg_by_port(u32 base, u8 port, u8 mac_idx)
 	return rtw89_mac_reg_by_idx(base + port * 0x40, mac_idx);
 }
 
+static inline u32
+rtw89_read32_port(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif, u32 base)
+{
+	u32 reg;
+
+	reg = rtw89_mac_reg_by_port(base, rtwvif->port, rtwvif->mac_idx);
+	return rtw89_read32(rtwdev, reg);
+}
+
 static inline u32
 rtw89_read32_port_mask(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif,
 		       u32 base, u32 mask)
@@ -910,6 +919,8 @@ void rtw89_mac_port_tsf_sync(struct rtw89_dev *rtwdev,
 			     struct rtw89_vif *rtwvif,
 			     struct rtw89_vif *rtwvif_src,
 			     u16 offset_tu);
+int rtw89_mac_port_get_tsf(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif,
+			   u64 *tsf);
 void rtw89_mac_set_he_obss_narrow_bw_ru(struct rtw89_dev *rtwdev,
 					struct ieee80211_vif *vif);
 void rtw89_mac_stop_ap(struct rtw89_dev *rtwdev, struct rtw89_vif *rtwvif);