Some SCIF versions mux error and break interrupts together and then provide
a separate interrupt ID for just TEI/DRI.
Allow all 6 types of interrupts to be specified via platform data (or DT)
and for any signals that are muxed together (have the same interrupt
number) simply register one handler.
Signed-off-by: Chris Brandt <chris.brandt@xxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
v2:
* Removed - 1 from loop
* Added Reviewed-by
---
drivers/tty/serial/sh-sci.c | 90 ++++++++++++++++++++-------------------------
1 file changed, 40 insertions(+), 50 deletions(-)
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 54ea58bbe3c9..377b2c1b52b9 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -65,7 +65,8 @@ enum {
SCIx_RXI_IRQ,
SCIx_TXI_IRQ,
SCIx_BRI_IRQ,
- SCIx_TEIDRI_IRQ,
+ SCIx_DRI_IRQ,
+ SCIx_TEI_IRQ,
SCIx_NR_IRQS,
SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */
@@ -77,9 +78,6 @@ enum {
((port)->irqs[SCIx_ERI_IRQ] && \
((port)->irqs[SCIx_RXI_IRQ] < 0))
-#define SCIx_TEIDRI_IRQ_EXISTS(port) \
- ((port)->irqs[SCIx_TEIDRI_IRQ] > 0)
-
enum SCI_CLKS {
SCI_FCK, /* Functional Clock */
SCI_SCK, /* Optional External Clock */
@@ -1685,14 +1683,23 @@ static irqreturn_t sci_tx_interrupt(int irq, void *ptr)
return IRQ_HANDLED;
}
-static irqreturn_t sci_br_interrupt(int irq, void *ptr);
+static irqreturn_t sci_br_interrupt(int irq, void *ptr)
+{
+ struct uart_port *port = ptr;
+
+ /* Handle BREAKs */
+ sci_handle_breaks(port);
+ sci_clear_SCxSR(port, SCxSR_BREAK_CLEAR(port));
+
+ return IRQ_HANDLED;
+}
static irqreturn_t sci_er_interrupt(int irq, void *ptr)
{
struct uart_port *port = ptr;
struct sci_port *s = to_sci_port(port);
- if (SCIx_TEIDRI_IRQ_EXISTS(s)) {
+ if (s->irqs[SCIx_ERI_IRQ] == s->irqs[SCIx_BRI_IRQ]) {
/* Break and Error interrupts are muxed */
unsigned short ssr_status = serial_port_in(port, SCxSR);
@@ -1727,17 +1734,6 @@ static irqreturn_t sci_er_interrupt(int irq, void *ptr)
return IRQ_HANDLED;
}
-static irqreturn_t sci_br_interrupt(int irq, void *ptr)
-{
- struct uart_port *port = ptr;
-
- /* Handle BREAKs */
- sci_handle_breaks(port);
- sci_clear_SCxSR(port, SCxSR_BREAK_CLEAR(port));
-
- return IRQ_HANDLED;
-}
-
static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
{
unsigned short ssr_status, scr_status, err_enabled, orer_status = 0;
@@ -1811,6 +1807,16 @@ static const struct sci_irq_desc {
.handler = sci_br_interrupt,
},
+ [SCIx_DRI_IRQ] = {
+ .desc = "rx ready",
+ .handler = sci_rx_interrupt,
+ },
+
+ [SCIx_TEI_IRQ] = {
+ .desc = "tx end",
+ .handler = sci_tx_interrupt,
+ },
+
/*
* Special muxed handler.
*/
@@ -1823,12 +1829,19 @@ static const struct sci_irq_desc {
static int sci_request_irq(struct sci_port *port)
{
struct uart_port *up = &port->port;
- int i, j, ret = 0;
+ int i, j, w, ret = 0;
for (i = j = 0; i < SCIx_NR_IRQS; i++, j++) {
const struct sci_irq_desc *desc;
int irq;
+ /* Check if already registered (muxed) */
+ for (w = 0; w < i; w++)
+ if (port->irqs[w] == port->irqs[i])
+ w = i + 1;
+ if (w > i)
+ continue;
+
if (SCIx_IRQ_IS_MUXED(port)) {
i = SCIx_MUX_IRQ;
irq = up->irq;
@@ -1845,31 +1858,8 @@ static int sci_request_irq(struct sci_port *port)
desc = sci_irq_desc + i;
port->irqstr[j] = NULL;
- if (SCIx_TEIDRI_IRQ_EXISTS(port)) {
- /*
- * ERI and BRI are muxed, just register ERI and
- * ignore BRI.
- * TEI and DRI are muxed, but only DRI
- * is enabled, so use RXI handler
- */
- if (i == SCIx_ERI_IRQ)
- port->irqstr[j] = kasprintf(GFP_KERNEL,
- "%s:err + break",
- dev_name(up->dev));
- if (i == SCIx_BRI_IRQ)
- continue;
- if (i == SCIx_TEIDRI_IRQ) {
- port->irqstr[j] = kasprintf(GFP_KERNEL,
- "%s:tx end + rx ready",
- dev_name(up->dev));
- desc = sci_irq_desc + SCIx_RXI_IRQ;
- }
- }
-
- if (!port->irqstr[j])
- port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s",
- dev_name(up->dev),
- desc->desc);
+ port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s",
+ dev_name(up->dev), desc->desc);
if (!port->irqstr[j]) {
ret = -ENOMEM;
goto out_nomem;
@@ -2842,17 +2832,17 @@ static int sci_init_single(struct platform_device *dev,
/* The SCI generates several interrupts. They can be muxed together or
* connected to different interrupt lines. In the muxed case only one
- * interrupt resource is specified. In the non-muxed case three or four
- * interrupt resources are specified, as the BRI interrupt is optional.
+ * interrupt resource is specified as there is only one interrupt ID.
+ * In the non-muxed case, up to 6 interrupt signals might be generated
+ * from the SCI, however those signals might have their own individual
+ * interrupt ID numbers, or muxed together with another interrupt.
*/
if (sci_port->irqs[0] < 0)
return -ENXIO;
- if (sci_port->irqs[1] < 0) {
- sci_port->irqs[1] = sci_port->irqs[0];
- sci_port->irqs[2] = sci_port->irqs[0];
- sci_port->irqs[3] = sci_port->irqs[0];
- }
+ if (sci_port->irqs[1] < 0)
+ for (i = 1; i < ARRAY_SIZE(sci_port->irqs); i++)
+ sci_port->irqs[i] = sci_port->irqs[0];
sci_port->params = sci_probe_regmap(p);
if (unlikely(sci_port->params == NULL))
--
2.16.1
