IPW_INTERNAL_CMD_EVENT
reg = ipw_read_reg32(p, IPW_INTERNAL_CMD_EVENT);
ipw_write_reg32(p, IPW_INTERNAL_CMD_EVENT, reg);
ipw_write_reg32(priv, IPW_INTERNAL_CMD_EVENT, IPW_BASEBAND_POWER_DOWN);
ipw_write_reg32(priv, IPW_INTERNAL_CMD_EVENT, 0);