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Commit 19038ad9 authored by Lars-Peter Clausen's avatar Lars-Peter Clausen Committed by Greg Kroah-Hartman
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tty: xuartps: Add support for setting modem control signals 



Add support for setting the state of the DTR and RTS signals.

Acked-by: default avatarSoren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: default avatarLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f77d55a3

drivers/tty/serial/xilinx_uartps.c

+21 −1
Original line number Diff line number Diff line
@@ -132,6 +132,15 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); 
/* Goes in read_status_mask for break detection as the HW doesn't do it*/

#define CDNS_UART_IXR_BRK	0x80000000



/*

 * Modem Control register:

 * The read/write Modem Control register controls the interface with the modem

 * or data set, or a peripheral device emulating a modem.

 */

#define CDNS_UART_MODEMCR_FCM	0x00000020 /* Automatic flow control mode */

#define CDNS_UART_MODEMCR_RTS	0x00000002 /* Request to send output control */

#define CDNS_UART_MODEMCR_DTR	0x00000001 /* Data Terminal Ready */



/*

 * Channel Status Register:

 * The channel status register (CSR) is provided to enable the control logic
@@ -915,7 +924,18 @@ static unsigned int cdns_uart_get_mctrl(struct uart_port *port) 


static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)

{

	/* N/A */

	u32 val;



	val = cdns_uart_readl(CDNS_UART_MODEMCR_OFFSET);



	val &= ~(CDNS_UART_MODEMCR_RTS | CDNS_UART_MODEMCR_DTR);



	if (mctrl & TIOCM_RTS)

		val |= CDNS_UART_MODEMCR_RTS;

	if (mctrl & TIOCM_DTR)

		val |= CDNS_UART_MODEMCR_DTR;



	cdns_uart_writel(val, CDNS_UART_MODEMCR_OFFSET);

}



#ifdef CONFIG_CONSOLE_POLL