MIPS: ath25: add common parts

Add common code for Atheros AR5312 and Atheros AR2315 SoCs families.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8237
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ath25/board.c

@@ -0,0 +1,51 @@
+/*
+ * 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) 2003 Atheros Communications, Inc.,  All Rights Reserved.
+ * Copyright (C) 2006 FON Technology, SL.
+ * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <asm/irq_cpu.h>
+#include <asm/reboot.h>
+#include <asm/bootinfo.h>
+#include <asm/time.h>
+
+static void ath25_halt(void)
+{
+	local_irq_disable();
+	unreachable();
+}
+
+void __init plat_mem_setup(void)
+{
+	_machine_halt = ath25_halt;
+	pm_power_off = ath25_halt;
+
+	/* Disable data watchpoints */
+	write_c0_watchlo0(0);
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+}
+
+void __init plat_time_init(void)
+{
+}
+
+unsigned int __cpuinit get_c0_compare_int(void)
+{
+	return CP0_LEGACY_COMPARE_IRQ;
+}
+
+void __init arch_init_irq(void)
+{
+	clear_c0_status(ST0_IM);
+	mips_cpu_irq_init();
+}