2 files changed, 72 insertions, 0 deletions

diff --git a/arch/mips/loongson/common/Makefile b/arch/mips/loongson/common/Makefile
index 656b3cc0a2a6..d21d1163fad0 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 000000000000..6d341e426f64
--- /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);