The JZ4750D UART interface is almost 16550 compatible.
The UART module needs to be enabled by setting a bit in the FCR register
and it has support for receive timeout interrupts. Instead of adding yet
another machine specific quirk to the 8250 serial driver we provide a
serial_out implementation which sets the required additional flags.
Signed-off-by: Antony Pavlov <antonynpavlov@xxxxxxxxx>
---
arch/mips/jz4750d/serial.c | 32 ++++++++++++++++++++++++++++++++
arch/mips/jz4750d/serial.h | 22 ++++++++++++++++++++++
2 files changed, 54 insertions(+)
create mode 100644 arch/mips/jz4750d/serial.c
create mode 100644 arch/mips/jz4750d/serial.h
diff --git a/arch/mips/jz4750d/serial.c b/arch/mips/jz4750d/serial.c
new file mode 100644
index 0000000..e152e64
--- /dev/null
+++ b/arch/mips/jz4750d/serial.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2012, Antony Pavlov <antonynpavlov@xxxxxxxxx>
+ * JZ4750D serial support
+ *
+ * based on JZ4740 serial support
+ * Copyright (C) 2010, Lars-Peter Clausen <lars@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/io.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+
+void jz4750d_serial_out(struct uart_port *p, int offset, int value)
+{
+ switch (offset) {
+ case UART_FCR:
+ value |= 0x10; /* Enable uart module */
+ break;
+ case UART_IER:
+ value |= (value & 0x4) << 2;
+ break;
+ default:
+ break;
+ }
+ writeb(value, p->membase + (offset << p->regshift));
+}
diff --git a/arch/mips/jz4750d/serial.h b/arch/mips/jz4750d/serial.h
new file mode 100644
index 0000000..d381572
--- /dev/null
+++ b/arch/mips/jz4750d/serial.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2012, Antony Pavlov <antonynpavlov@xxxxxxxxx>
+ * JZ4750D serial support
+ *
+ * based on JZ4740 serial support
+ * Copyright (C) 2010, Lars-Peter Clausen <lars@xxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#ifndef __MIPS_JZ4750D_SERIAL_H__
+#define __MIPS_JZ4750D_SERIAL_H__
+
+struct uart_port;
+
+void jz4750d_serial_out(struct uart_port *p, int offset, int value);
+
+#endif
--
1.7.10.4
