AR5K_BEACON_5210
beacon = ath5k_hw_reg_read(ah, AR5K_BEACON_5210);
ath5k_hw_reg_write(ah, beacon & ~AR5K_BEACON_ENABLE, AR5K_BEACON_5210);
ath5k_hw_reg_write(ah, beacon, AR5K_BEACON_5210);
AR5K_BEACON_5210 : AR5K_BEACON_5211)