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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: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lars-Peter Clausen 2014-11-05 13:35:16 +01:00 committed by Greg Kroah-Hartman
parent f77d55a3b5
commit 19038ad9f0
1 changed files with 21 additions and 1 deletions
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22
drivers/tty/serial/xilinx_uartps.c
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@ -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