diff options
| author |   Lars-Peter Clausen <lars@metafoo.de> | 2014-11-05 13:35:16 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-06 14:57:27 -0800 |
| commit | 19038ad9f08c96dcff870b18af8fd5ae5141dec1 (patch) | |
| tree | b3524f4c8e6b4015f6f9ef2ec5bc0388b8286c7b /drivers/tty/serial/xilinx_uartps.c | |
| parent | serial: 8250_dw: get index of serial line from DT aliases (diff) | |
| download | linux-dev-19038ad9f08c96dcff870b18af8fd5ae5141dec1.tar.xz linux-dev-19038ad9f08c96dcff870b18af8fd5ae5141dec1.zip | |
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>
Diffstat (limited to 'drivers/tty/serial/xilinx_uartps.c')
| -rw-r--r-- | drivers/tty/serial/xilinx_uartps.c | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 200c1af2141b..542bab37e502 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -133,6 +133,15 @@ MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255"); #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 * to monitor the status of bits in the channel interrupt status register, @@ -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 |