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avr32: add hardware handshake support to atmel_serial

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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: Peter Ma <pma@mediamatech.com>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
This commit is contained in:
Peter Ma 2009-03-31 10:31:02 -07:00 committed by Haavard Skinnemoen
parent bf4861cf3e
commit 8e706c4d0d
1 changed files with 8 additions and 1 deletions
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9
drivers/serial/atmel_serial.c
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@ -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;