zd1211rw: Implement get_tsf()

This patch implements get_tsf() of ieee80211_ops in the zd1211rw driver.

Signed-off-by: Alina Friedrichsen <x-alina@gmx.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/zd1211rw/zd_chip.c

@@ -1616,3 +1616,24 @@ int zd_chip_set_multicast_hash(struct zd_chip *chip,
 
 	return zd_iowrite32a(chip, ioreqs, ARRAY_SIZE(ioreqs));
 }
+
+u64 zd_chip_get_tsf(struct zd_chip *chip)
+{
+	int r;
+	static const zd_addr_t aw_pt_bi_addr[] =
+		{ CR_TSF_LOW_PART, CR_TSF_HIGH_PART };
+	u32 values[2];
+	u64 tsf;
+
+	mutex_lock(&chip->mutex);
+	r = zd_ioread32v_locked(chip, values, (const zd_addr_t *)aw_pt_bi_addr,
+	                        ARRAY_SIZE(aw_pt_bi_addr));
+	mutex_unlock(&chip->mutex);
+	if (r)
+		return 0;
+
+	tsf = values[1];
+	tsf = (tsf << 32) | values[0];
+
+	return tsf;
+}

drivers/net/wireless/zd1211rw/zd_chip.h

@@ -950,4 +950,6 @@ static inline void zd_mc_add_addr(struct zd_mc_hash *hash, u8 *addr)
 int zd_chip_set_multicast_hash(struct zd_chip *chip,
 	                       struct zd_mc_hash *hash);
 
+u64 zd_chip_get_tsf(struct zd_chip *chip);
+
 #endif /* _ZD_CHIP_H */

drivers/net/wireless/zd1211rw/zd_mac.c

@@ -935,6 +935,12 @@ static void zd_op_bss_info_changed(struct ieee80211_hw *hw,
 	}
 }
 
+static u64 zd_op_get_tsf(struct ieee80211_hw *hw)
+{
+	struct zd_mac *mac = zd_hw_mac(hw);
+	return zd_chip_get_tsf(&mac->chip);
+}
+
 static const struct ieee80211_ops zd_ops = {
 	.tx			= zd_op_tx,
 	.start			= zd_op_start,
@@ -945,6 +951,7 @@ static const struct ieee80211_ops zd_ops = {
 	.config_interface	= zd_op_config_interface,
 	.configure_filter	= zd_op_configure_filter,
 	.bss_info_changed	= zd_op_bss_info_changed,
+	.get_tsf		= zd_op_get_tsf,
 };
 
 struct ieee80211_hw *zd_mac_alloc_hw(struct usb_interface *intf)