serial: sh-sci: Replace hardcoded overrun bit values

Add the missing overrun bit definition for (H)SCIF.
Replace overrun_bit by overrun_mask, so we can use the existing
defines instead of hardcoded values.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/sh-sci.c

@@ -81,7 +81,7 @@ struct sci_port {
 
 	/* Platform configuration */
 	struct plat_sci_port	*cfg;
-	int			overrun_bit;
+	unsigned int		overrun_mask;
 	unsigned int		error_mask;
 	unsigned int		sampling_rate;
 
@@ -803,7 +803,7 @@ static int sci_handle_errors(struct uart_port *port)
 	struct sci_port *s = to_sci_port(port);
 
 	/* Handle overruns */
-	if (status & (1 << s->overrun_bit)) {
+	if (status & s->overrun_mask) {
 		port->icount.overrun++;
 
 		/* overrun error */
@@ -867,7 +867,7 @@ static int sci_handle_fifo_overrun(struct uart_port *port)
 	struct sci_port *s = to_sci_port(port);
 	struct plat_sci_reg *reg;
 	int copied = 0, offset;
-	u16 status, bit;
+	u16 status;
 
 	switch (port->type) {
 	case PORT_SCIF:
@@ -887,10 +887,8 @@ static int sci_handle_fifo_overrun(struct uart_port *port)
 		return 0;
 
 	status = serial_port_in(port, offset);
-	bit = 1 << s->overrun_bit;
-
-	if (status & bit) {
-		status &= ~bit;
+	if (status & s->overrun_mask) {
+		status &= ~s->overrun_mask;
 		serial_port_out(port, offset, status);
 
 		port->icount.overrun++;
@@ -1081,7 +1079,7 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr)
 		ret = sci_br_interrupt(irq, ptr);
 
 	/* Overrun Interrupt */
-	if (orer_status & (1 << s->overrun_bit))
+	if (orer_status & s->overrun_mask)
 		sci_handle_fifo_overrun(port);
 
 	return ret;
@@ -2256,32 +2254,32 @@ static int sci_init_single(struct platform_device *dev,
 	switch (p->type) {
 	case PORT_SCIFB:
 		port->fifosize = 256;
-		sci_port->overrun_bit = 9;
+		sci_port->overrun_mask = SCIFA_ORER;
 		sampling_rate = 16;
 		break;
 	case PORT_HSCIF:
 		port->fifosize = 128;
 		sampling_rate = 0;
-		sci_port->overrun_bit = 0;
+		sci_port->overrun_mask = SCLSR_ORER;
 		break;
 	case PORT_SCIFA:
 		port->fifosize = 64;
-		sci_port->overrun_bit = 9;
+		sci_port->overrun_mask = SCIFA_ORER;
 		sampling_rate = 16;
 		break;
 	case PORT_SCIF:
 		port->fifosize = 16;
 		if (p->regtype == SCIx_SH7705_SCIF_REGTYPE) {
-			sci_port->overrun_bit = 9;
+			sci_port->overrun_mask = SCIFA_ORER;
 			sampling_rate = 16;
 		} else {
-			sci_port->overrun_bit = 0;
+			sci_port->overrun_mask = SCLSR_ORER;
 			sampling_rate = 32;
 		}
 		break;
 	default:
 		port->fifosize = 1;
-		sci_port->overrun_bit = 5;
+		sci_port->overrun_mask = SCI_ORER;
 		sampling_rate = 32;
 		break;
 	}
@@ -2335,7 +2333,7 @@ static int sci_init_single(struct platform_device *dev,
 	 * Make the error mask inclusive of overrun detection, if
 	 * supported.
 	 */
-	sci_port->error_mask |= 1 << sci_port->overrun_bit;
+	sci_port->error_mask |= sci_port->overrun_mask;
 
 	port->type		= p->type;
 	port->flags		= UPF_FIXED_PORT | p->flags;

drivers/tty/serial/sh-sci.h

@@ -87,6 +87,9 @@ enum {
 #define SCFCR_RFRST	BIT(1)	/* Receive FIFO Data Register Reset */
 #define SCFCR_LOOP	BIT(0)	/* Loopback Test */
 
+/* SCLSR (Line Status Register) on (H)SCIF */
+#define SCLSR_ORER	BIT(0)	/* Overrun Error */
+
 /* SCSPTR (Serial Port Register), optional */
 #define SCSPTR_RTSIO	BIT(7)	/* Serial Port RTS Pin Input/Output */
 #define SCSPTR_RTSDT	BIT(6)	/* Serial Port RTS Pin Data */