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path: root/drivers/tty/serial/sh-sci.c
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Diffstat (limited to 'drivers/tty/serial/sh-sci.c')
-rw-r--r--drivers/tty/serial/sh-sci.c49
1 files changed, 44 insertions, 5 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 3158e17b665c..4604153b7954 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1052,9 +1052,17 @@ static int sci_request_irq(struct sci_port *port)
if (SCIx_IRQ_IS_MUXED(port)) {
i = SCIx_MUX_IRQ;
irq = up->irq;
- } else
+ } else {
irq = port->cfg->irqs[i];
+ /*
+ * Certain port types won't support all of the
+ * available interrupt sources.
+ */
+ if (unlikely(!irq))
+ continue;
+ }
+
desc = sci_irq_desc + i;
port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s",
dev_name(up->dev), desc->desc);
@@ -1094,6 +1102,15 @@ static void sci_free_irq(struct sci_port *port)
* IRQ first.
*/
for (i = 0; i < SCIx_NR_IRQS; i++) {
+ unsigned int irq = port->cfg->irqs[i];
+
+ /*
+ * Certain port types won't support all of the available
+ * interrupt sources.
+ */
+ if (unlikely(!irq))
+ continue;
+
free_irq(port->cfg->irqs[i], port);
kfree(port->irqstr[i]);
@@ -1564,10 +1581,32 @@ static void sci_enable_ms(struct uart_port *port)
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);
+ struct plat_sci_reg *reg = sci_regmap[s->cfg->regtype] + SCSPTR;
+ unsigned short scscr, scsptr;
+
+ /* check wheter the port has SCSPTR */
+ if (!reg->size) {
+ /*
+ * Not supported by hardware. Most parts couple break and rx
+ * interrupts together, with break detection always enabled.
+ */
+ return;
+ }
+
+ 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);
}
#ifdef CONFIG_SERIAL_SH_SCI_DMA