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Commit 8e706c4d authored by Peter Ma's avatar Peter Ma Committed by Haavard Skinnemoen
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avr32: add hardware handshake support to atmel_serial 



Adds Hardware Handshake (aka RTS/CTS flow-control) support to
atmel_serial driver, as a termios flag.

For this to actually work, the platform code needs to configure the RTS
and CTS pins for use by the USART. This has been done for AVR32 as a
separate patch.

Signed-off-by: default avatarPeter Ma <pma@mediamatech.com>
Signed-off-by: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
Acked-by: default avatarAlan Cox <alan@lxorguk.ukuu.org.uk>
parent bf4861cf

drivers/serial/atmel_serial.c

+8 −1
Original line number Diff line number Diff line
@@ -1020,7 +1020,8 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, 


	/* Get current mode register */

	mode = UART_GET_MR(port) & ~(ATMEL_US_USCLKS | ATMEL_US_CHRL

					| ATMEL_US_NBSTOP | ATMEL_US_PAR);

					| ATMEL_US_NBSTOP | ATMEL_US_PAR

					| ATMEL_US_USMODE);



	baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);

	quot = uart_get_divisor(port, baud);
@@ -1065,6 +1066,12 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios, 
	} else

		mode |= ATMEL_US_PAR_NONE;



	/* hardware handshake (RTS/CTS) */

	if (termios->c_cflag & CRTSCTS)

		mode |= ATMEL_US_USMODE_HWHS;

	else

		mode |= ATMEL_US_USMODE_NORMAL;



	spin_lock_irqsave(&port->lock, flags);



	port->read_status_mask = ATMEL_US_OVRE;