1 files changed, 34 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh3/serial-sh770x.c b/arch/sh/kernel/cpu/sh3/serial-sh770x.c
new file mode 100644
index 000000000..dec027f23
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh3/serial-sh770x.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/serial_sci.h>
+#include <linux/serial_core.h>
+#include <linux/io.h>
+#include <cpu/serial.h>
+
+#define SCPCR 0xA4000116
+#define SCPDR 0xA4000136
+
+static void sh770x_sci_init_pins(struct uart_port *port, unsigned int cflag)
+{
+	unsigned short data;
+
+	/* We need to set SCPCR to enable RTS/CTS */
+	data = __raw_readw(SCPCR);
+	/* Clear out SCP7MD1,0, SCP6MD1,0, SCP4MD1,0*/
+	__raw_writew(data & 0x0fcf, SCPCR);
+
+	if (!(cflag & CRTSCTS)) {
+		/* We need to set SCPCR to enable RTS/CTS */
+		data = __raw_readw(SCPCR);
+		/* Clear out SCP7MD1,0, SCP4MD1,0,
+		   Set SCP6MD1,0 = {01} (output)  */
+		__raw_writew((data & 0x0fcf) | 0x1000, SCPCR);
+
+		data = __raw_readb(SCPDR);
+		/* Set /RTS2 (bit6) = 0 */
+		__raw_writeb(data & 0xbf, SCPDR);
+	}
+}
+
+struct plat_sci_port_ops sh770x_sci_port_ops = {
+	.init_pins	= sh770x_sci_init_pins,
+};