MIPS: Loongson: Add serial port support

This patch add serial port support for all of the existing loongson
family machines. most of the board specific part are put in serial.c,
and the base address of the serial ports are defined as macros in
machine.h for sharing it between serial.c and early_printk.c

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: Linux-MIPS <linux-mips@linux-mips.org>
Cc: yanh@lemote.com
Cc: huhb@lemote.com
Cc: Zhang Le <r0bertz@gentoo.org>
Cc: zhangfx@lemote.com
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

2 files changed, 72 insertions, 0 deletions

diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile
index 656b3cc..d21d116 100644
--- a/arch/mips/loongson/common/Makefile
+++ b/arch/mips/loongson/common/Makefile
@@ -9,3 +9,4 @@ obj-y += setup.o init.o cmdline.o env.o time.o reset.o irq.o \
 # Early printk support
 #
 obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+obj-$(CONFIG_SERIAL_8250) += serial.o
diff --git a/arch/mips/loongson/common/serial.c b/arch/mips/loongson/common/serial.c
new file mode 100644
index 0000000..6d341e4
--- /dev/null
+++ b/arch/mips/loongson/common/serial.c
@@ -0,0 +1,71 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2007 Ralf Baechle (ralf@linux-mips.org)
+ *
+ * Copyright (C) 2009 Lemote, Inc.
+ * Author: Yan hua (yanhua@lemote.com)
+ * Author: Wu Zhangjin (wuzj@lemote.com)
+ */
+
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/serial_8250.h>
+
+#include <asm/bootinfo.h>
+
+#include <loongson.h>
+#include <machine.h>
+
+#define PORT(int)			\
+{								\
+	.irq		= int,					\
+	.uartclk	= 1843200,				\
+	.iobase		= (LOONGSON_UART_BASE - LOONGSON_PCIIO_BASE),\
+	.iotype		= UPIO_PORT,				\
+	.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,	\
+	.regshift	= 0,					\
+}
+
+#define PORT_M(int)				\
+{								\
+	.irq		= MIPS_CPU_IRQ_BASE + (int),		\
+	.uartclk	= 3686400,				\
+	.iotype		= UPIO_MEM,				\
+	.membase	= (void __iomem *)NULL,			\
+	.flags		= UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,	\
+	.regshift	= 0,					\
+}
+
+static struct plat_serial8250_port uart8250_data[][2] = {
+	[MACH_LOONGSON_UNKNOWN]         {},
+	[MACH_LEMOTE_FL2E]              {PORT(4), {} },
+	[MACH_LEMOTE_FL2F]              {PORT(3), {} },
+	[MACH_LEMOTE_ML2F7]             {PORT_M(3), {} },
+	[MACH_LEMOTE_YL2F89]            {PORT_M(3), {} },
+	[MACH_DEXXON_GDIUM2F10]         {PORT_M(3), {} },
+	[MACH_LOONGSON_END]             {},
+};
+
+static struct platform_device uart8250_device = {
+	.name = "serial8250",
+	.id = PLAT8250_DEV_PLATFORM,
+	.dev = {
+		.platform_data = uart8250_data[LOONGSON_MACHTYPE],
+		},
+};
+
+static int __init serial_init(void)
+{
+	if (uart8250_data[LOONGSON_MACHTYPE][0].iotype == UPIO_MEM)
+		uart8250_data[LOONGSON_MACHTYPE][0].membase =
+			ioremap_nocache(LOONGSON_UART_BASE, 8);
+
+	platform_device_register(&uart8250_device);
+
+	return 0;
+}
+
+device_initcall(serial_init);