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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: Peter Ma <pma@mediamatech.com> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
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1 changed files with 8 additions and 1 deletions
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@ -1020,7 +1020,8 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
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/* Get current mode register */
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mode = UART_GET_MR(port) & ~(ATMEL_US_USCLKS | ATMEL_US_CHRL
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| ATMEL_US_NBSTOP | ATMEL_US_PAR);
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| ATMEL_US_NBSTOP | ATMEL_US_PAR
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| ATMEL_US_USMODE);
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baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
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quot = uart_get_divisor(port, baud);
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@ -1065,6 +1066,12 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
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} else
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mode |= ATMEL_US_PAR_NONE;
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/* hardware handshake (RTS/CTS) */
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if (termios->c_cflag & CRTSCTS)
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mode |= ATMEL_US_USMODE_HWHS;
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else
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mode |= ATMEL_US_USMODE_NORMAL;
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spin_lock_irqsave(&port->lock, flags);
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port->read_status_mask = ATMEL_US_OVRE;
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