serial_txx9: Fix modem control line handling

This chip does not have modem control lines.  Return TIOCM_CAR and
TIOCM_DSR always on get_mctrl() and ajust some bits in termios cflag.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/serial/serial_txx9.c b/drivers/serial/serial_txx9.c
index b8f91e018b21..0930e2a85514 100644
--- a/drivers/serial/serial_txx9.c
+++ b/drivers/serial/serial_txx9.c
@@ -37,7 +37,7 @@
 
 #include <asm/io.h>
 
-static char *serial_version = "1.09";
+static char *serial_version = "1.10";
 static char *serial_name = "TX39/49 Serial driver";
 
 #define PASS_LIMIT      256
@@ -436,8 +436,10 @@ static unsigned int serial_txx9_get_mctrl(struct uart_port *port)
         struct uart_txx9_port *up = (struct uart_txx9_port *)port;
         unsigned int ret;
 
-        ret =  ((sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS)
-                | ((sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS);
+        /* no modem control lines */
+        ret = TIOCM_CAR | TIOCM_DSR;
+        ret |= (sio_in(up, TXX9_SIFLCR) & TXX9_SIFLCR_RTSSC) ? 0 : TIOCM_RTS;
+        ret |= (sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS) ? 0 : TIOCM_CTS;
 
         return ret;
 }
@@ -557,6 +559,12 @@ serial_txx9_set_termios(struct uart_port *port, struct ktermios *termios,
         unsigned long flags;
         unsigned int baud, quot;
 
+        /*
+         * We don't support modem control lines.
+         */
+        termios->c_cflag &= ~(HUPCL | CMSPAR);
+        termios->c_cflag |= CLOCAL;
+
         cval = sio_in(up, TXX9_SILCR);
         /* byte size and parity */
         cval &= ~TXX9_SILCR_UMODE_MASK;