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

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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>
This commit is contained in:
Geert Uytterhoeven 2016-06-03 12:00:09 +02:00 • committed by Greg Kroah-Hartman
parent d2b9775d79
commit e9d7a45a03
1 changed files with 15 additions and 1 deletions
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16
drivers/tty/serial/sh-sci.c
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@ -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 */