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authorLars-Peter Clausen <lars@metafoo.de>2014-11-05 13:35:16 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-06 14:57:27 -0800
commit19038ad9f08c96dcff870b18af8fd5ae5141dec1 (patch)
treeb3524f4c8e6b4015f6f9ef2ec5bc0388b8286c7b /drivers
parentf77d55a3b56a98d14b6e7dc549c24b33011d175d (diff)
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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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/tty/serial/xilinx_uartps.c22
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