UART_FCTR

UART_FCTR_TX     2165 drivers/tty/serial/8250/8250_port.c 		fctr = serial_in(up, UART_FCTR) & ~(UART_FCTR_RX|UART_FCTR_TX);
UART_FCTR_TX     2170 drivers/tty/serial/8250/8250_port.c 				fctr | UART_FCTR_TRGD | UART_FCTR_TX);