Add support for a "RZ_SCIFA" which is different than a traditional
SCIFA. It looks like a normal SCIF with FIFO data, but with a
compressed address space. Also, the break out of interrupts
are different then traditinal SCIF: ERI/BRI, RXI, TXI, TEI, DRI.
The R7S9210 (RZ/A2) contains this type of SCIF.
Signed-off-by: Chris Brandt <chris.brandt@xxxxxxxxxxx>
---
drivers/tty/serial/sh-sci.c | 77 +++++++++++++++++++++++++++++++++++++++++++--
include/linux/serial_sci.h | 1 +
2 files changed, 76 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index c181eb37f985..d3435976ba7e 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -65,6 +65,7 @@ enum {
SCIx_RXI_IRQ,
SCIx_TXI_IRQ,
SCIx_BRI_IRQ,
+ SCIx_TEIDRI_IRQ,
SCIx_NR_IRQS,
SCIx_MUX_IRQ = SCIx_NR_IRQS, /* special case */
@@ -76,6 +77,9 @@ 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 */
@@ -287,6 +291,33 @@ static const struct sci_port_params sci_port_params[SCIx_NR_REGTYPES] = {
.error_clear = SCIF_ERROR_CLEAR,
},
+ /*
+ * The "SCIFA" that is in RZ/T and RZ/A2.
+ * It looks like a normal SCIF with FIFO data, but with a
+ * compressed address space. Also, the break out of interrupts
+ * are different: ERI/BRI, RXI, TXI, TEI, DRI.
+ */
+ [SCIx_RZ_SCIFA_REGTYPE] = {
+ .regs = {
+ [SCSMR] = { 0x00, 16 },
+ [SCBRR] = { 0x02, 8 },
+ [SCSCR] = { 0x04, 16 },
+ [SCxTDR] = { 0x06, 8 },
+ [SCxSR] = { 0x08, 16 },
+ [SCxRDR] = { 0x0A, 8 },
+ [SCFCR] = { 0x0C, 16 },
+ [SCFDR] = { 0x0E, 16 },
+ [SCSPTR] = { 0x10, 16 },
+ [SCLSR] = { 0x12, 16 },
+ },
+ .fifosize = 16,
+ .overrun_reg = SCLSR,
+ .overrun_mask = SCLSR_ORER,
+ .sampling_rate_mask = SCI_SR(32),
+ .error_mask = SCIF_DEFAULT_ERROR_MASK,
+ .error_clear = SCIF_ERROR_CLEAR,
+ },
+
/*
* Common SH-3 SCIF definitions.
*/
@@ -1683,11 +1714,26 @@ 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_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)) {
+ /* Break and Error interrupts are muxed */
+ unsigned short ssr_status = serial_port_in(port, SCxSR);
+
+ /* Break Interrupt */
+ if (ssr_status & SCxSR_BRK(port))
+ sci_br_interrupt(irq, ptr);
+
+ /* Break only? */
+ if (!(ssr_status & SCxSR_ERRORS(port)))
+ return IRQ_HANDLED;
+ }
+
/* Handle errors */
if (port->type == PORT_SCI) {
if (sci_handle_errors(port)) {
@@ -1827,8 +1873,31 @@ static int sci_request_irq(struct sci_port *port)
}
desc = sci_irq_desc + i;
- port->irqstr[j] = kasprintf(GFP_KERNEL, "%s:%s",
- dev_name(up->dev), desc->desc);
+ 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);
if (!port->irqstr[j]) {
ret = -ENOMEM;
goto out_nomem;
@@ -3073,6 +3142,10 @@ static const struct of_device_id of_sci_match[] = {
.compatible = "renesas,scif-r7s72100",
.data = SCI_OF_DATA(PORT_SCIF, SCIx_SH2_SCIF_FIFODATA_REGTYPE),
},
+ {
+ .compatible = "renesas,scif-r7s9210",
+ .data = SCI_OF_DATA(PORT_SCIF, SCIx_RZ_SCIFA_REGTYPE),
+ },
/* Family-specific types */
{
.compatible = "renesas,rcar-gen1-scif",
diff --git a/include/linux/serial_sci.h b/include/linux/serial_sci.h
index c0e795d95477..1c89611e0e06 100644
--- a/include/linux/serial_sci.h
+++ b/include/linux/serial_sci.h
@@ -36,6 +36,7 @@ enum {
SCIx_SH4_SCIF_FIFODATA_REGTYPE,
SCIx_SH7705_SCIF_REGTYPE,
SCIx_HSCIF_REGTYPE,
+ SCIx_RZ_SCIFA_REGTYPE,
SCIx_NR_REGTYPES,
};
--
2.16.1
--
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