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serial: sh-sci: modify sci_break_ctl()

PATCH In review Shimoda, Yoshihiro 2 participants 2 messages Apr 12, 2012

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TTY layer and serial drivers SuperH
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Shimoda, Yoshihiro

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#0 lore raw

PATCH v3 1/1 serial: sh-sci: modify sci_break_ctl()

SCIF modules which have SCSPTR can output the break signal. This patch supports it.

This patch tested on sh7757lcr.

Signed-off-by Yoshihiro Shimoda <[email protected]>

---
about v3:
- modify a method which detects SCSPTR

 drivers/tty/serial/sh-sci.c |   30 ++++++++++++++++++++++++++----
 include/linux/serial_sci.h  |    2 ++
 2 files changed, 28 insertions(+), 4 deletions(-)
drivers/tty/serial/sh-sci.c +26 -4
index 3158e17..be31d85 100644
@@ -1564,10 +1564,32 @@ 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
include/linux/serial_sci.h +2 -0
index 7877907..eb763ad 100644
@@ -52,6 +52,8 @@ enum {
 /* 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 {
Signature · 1 line
1.7.1
#1 lore raw
Quoted 10 lines · Yoshihiro

SCIF modules which have SCSPTR can output the break signal. This patch supports it.

This patch tested on sh7757lcr.

Signed-off-by Yoshihiro Shimoda <[email protected]>

---
about v3:
- modify a method which detects SCSPTR

Looks good, applied.