MIPS: Loongson: Define rtc device on MC146818-equipped systems

This patch declare the rtc device present on systems with clock compatible
with the mc146818 and handled by rtc-cmos. Introduce a new Kconfig entry
because there are some systems without rtc_cmos compatible clock.

Signed-off-by: Arnaud Patard <[e-mail]>
To: [e-mail]
Cc: [e-mail]
Patchwork: http://patchwork.linux-mips.org/patch/1320/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/loongson/Kconfig

···
 	select GENERIC_HARDIRQS_NO__DO_IRQ
 	select GENERIC_ISA_DMA_SUPPORT_BROKEN
 	select CPU_HAS_WB
+	select LOONGSON_MC146818
 	help
 	  Lemote Fuloong(2e) mini-PC board based on the Chinese Loongson-2E CPU and
 	  an FPGA northbridge
···
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_HIGHMEM
 	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select LOONGSON_MC146818
 	help
 	  Lemote Loongson 2F family machines utilize the 2F revision of
 	  Loongson processor and the AMD CS5536 south bridge.
···
 	bool
 	default y
 	depends on EARLY_PRINTK || SERIAL_8250
+
+config LOONGSON_MC146818
+	bool
+	default n

arch/mips/loongson/common/Makefile

···
 obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
 obj-$(CONFIG_SERIAL_8250) += serial.o
 obj-$(CONFIG_LOONGSON_UART_BASE) += uart_base.o
+obj-$(CONFIG_LOONGSON_MC146818) += rtc.o
 
 #
 # Enable CS5536 Virtual Support Module(VSM) to virtulize the PCI configure

arch/mips/loongson/common/rtc.c

···
+/*
+ *  Lemote Fuloong platform support
+ *
+ *  Copyright(c) 2010 Arnaud Patard <[e-mail]>
+ *
+ *  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/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/mc146818rtc.h>
+
+struct resource loongson_rtc_resources[] = {
+	{
+		.start	= RTC_PORT(0),
+		.end	= RTC_PORT(1),
+		.flags	= IORESOURCE_IO,
+	}, {
+		.start	= RTC_IRQ,
+		.end	= RTC_IRQ,
+		.flags	= IORESOURCE_IRQ,
+	}
+};
+
+static struct platform_device loongson_rtc_device = {
+	.name		= "rtc_cmos",
+	.id		= -1,
+	.resource	= loongson_rtc_resources,
+	.num_resources	= ARRAY_SIZE(loongson_rtc_resources),
+};
+
+
+static int __init loongson_rtc_platform_init(void)
+{
+	platform_device_register(&loongson_rtc_device);
+	return 0;
+}
+
+device_initcall(loongson_rtc_platform_init);