serial: sh-sci: Add pin initialization for SCIFA/SCIFB

Before, the driver relied on initialization by the boot loader, or by
implicit reset state.

Note that unlike on (H)SCIF, the RTS/CTS bits exist only if dedicated
RTS/CTS pins are available, which depends on the SoC and UART instance.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index c46999f..b9d027a 100644 (file)
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -712,7 +712,21 @@ static void sci_init_pins(struct uart_port *port, unsigned int cflag)
                return;
        }
 
-       if (sci_getreg(port, SCSPTR)->size) {
+       if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
+               u16 ctrl = serial_port_in(port, SCPCR);
+
+               /* Enable RXD and TXD pin functions */
+               ctrl &= ~(SCPCR_RXDC | SCPCR_TXDC);
+               if (to_sci_port(port)->cfg->capabilities & SCIx_HAVE_RTSCTS) {
+                       /* RTS# is output, driven 1 */
+                       ctrl |= SCPCR_RTSC;
+                       serial_port_out(port, SCPDR,
+                               serial_port_in(port, SCPDR) | SCPDR_RTSD);
+                       /* Enable CTS# pin function */
+                       ctrl &= ~SCPCR_CTSC;
+               }
+               serial_port_out(port, SCPCR, ctrl);
+       } else if (sci_getreg(port, SCSPTR)->size) {
                u16 status = serial_port_in(port, SCSPTR);
 
                /* RTS# is output, driven 1 */