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83 lines
2.8 KiB
Diff
83 lines
2.8 KiB
Diff
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From d9d3dc9a5a28b2bbb82fedca63aadae8ca540e94 Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Sat, 19 Jun 2010 04:08:16 +0000
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Subject: [PATCH] MIPS: JZ4740: Add serial support
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The JZ4740 UART interface is almost 16550 compatible.
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The UART module needs to be enabled by setting a bit in the FCR register
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and it has support for receive timeout interrupts. Instead of adding yet
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another machine specific quirk to the 8250 serial driver we provide a
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serial_out implementation which sets the required additional flags.
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Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Cc: linux-mips@linux-mips.org
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Cc: linux-kernel@vger.kernel.org
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Patchwork: https://patchwork.linux-mips.org/patch/1403/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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arch/mips/jz4740/serial.c | 33 +++++++++++++++++++++++++++++++++
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arch/mips/jz4740/serial.h | 20 ++++++++++++++++++++
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2 files changed, 53 insertions(+), 0 deletions(-)
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create mode 100644 arch/mips/jz4740/serial.c
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create mode 100644 arch/mips/jz4740/serial.h
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--- /dev/null
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+++ b/arch/mips/jz4740/serial.c
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@@ -0,0 +1,33 @@
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+/*
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+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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+ * JZ4740 serial support
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#include <linux/io.h>
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+#include <linux/serial_core.h>
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+#include <linux/serial_reg.h>
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+
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+void jz4740_serial_out(struct uart_port *p, int offset, int value)
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+{
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+ switch (offset) {
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+ case UART_FCR:
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+ value |= 0x10; /* Enable uart module */
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+ break;
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+ case UART_IER:
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+ value |= (value & 0x4) << 2;
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+ break;
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+ default:
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+ break;
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+ }
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+ writeb(value, p->membase + (offset << p->regshift));
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+}
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--- /dev/null
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+++ b/arch/mips/jz4740/serial.h
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@@ -0,0 +1,20 @@
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+/*
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+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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+ * JZ4740 serial support
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License as published by the
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+ * Free Software Foundation; either version 2 of the License, or (at your
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+ * option) any later version.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 675 Mass Ave, Cambridge, MA 02139, USA.
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+ *
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+ */
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+
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+#ifndef __MIPS_JZ4740_SERIAL_H__
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+
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+void jz4740_serial_out(struct uart_port *p, int offset, int value);
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+
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+#endif
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