serial: sh-sci: modify sci_break_ctl()
SCIF modules which have SCSPTR can output the break signal. Now that we
have a way of determining port features/capabilities, add trivial break
control via SCSPTR support. Tested on sh7757lcr.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 3158e17..3e471fc 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1564,10 +1564,32 @@
static void sci_break_ctl(struct uart_port *port, int break_state)
{
- /*
- * Not supported by hardware. Most parts couple break and rx
- * interrupts together, with break detection always enabled.
- */
+ struct sci_port *s = to_sci_port(port);
+ unsigned short scscr, scsptr;
+
+ switch (s->cfg->regtype) {
+ case SCIx_SH4_SCIF_REGTYPE:
+ scsptr = serial_port_in(port, SCSPTR);
+ scscr = serial_port_in(port, SCSCR);
+
+ if (break_state == -1) {
+ scsptr = (scsptr | SCSPTR_SPB2IO) & ~SCSPTR_SPB2DT;
+ scscr &= ~SCSCR_TE;
+ } else {
+ scsptr = (scsptr | SCSPTR_SPB2DT) & ~SCSPTR_SPB2IO;
+ scscr |= SCSCR_TE;
+ }
+
+ serial_port_out(port, SCSPTR, scsptr);
+ serial_port_out(port, SCSCR, scscr);
+ break;
+ default:
+ /*
+ * Not supported by hardware. Most parts couple break and rx
+ * interrupts together, with break detection always enabled.
+ */
+ break;
+ }
}
#ifdef CONFIG_SERIAL_SH_SCI_DMA
diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h
index 7877907..eb763adf 100644
--- a/include/linux/serial_sci.h
+++ b/include/linux/serial_sci.h
@@ -52,6 +52,8 @@
/* SCSPTR, optional */
#define SCSPTR_RTSIO (1 << 7)
#define SCSPTR_CTSIO (1 << 5)
+#define SCSPTR_SPB2IO (1 << 1)
+#define SCSPTR_SPB2DT (1 << 0)
/* Offsets into the sci_port->irqs array */
enum {