zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/kernel/time.c b/ap/os/linux/linux-3.4.x/arch/arm/kernel/time.c
new file mode 100644
index 0000000..fe31b22
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/arch/arm/kernel/time.c
@@ -0,0 +1,152 @@
+/*
+ * linux/arch/arm/kernel/time.c
+ *
+ * Copyright (C) 1991, 1992, 1995 Linus Torvalds
+ * Modifications for ARM (C) 1994-2001 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This file contains the ARM-specific time handling details:
+ * reading the RTC at bootup, etc...
+ */
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/timex.h>
+#include <linux/errno.h>
+#include <linux/profile.h>
+#include <linux/syscore_ops.h>
+#include <linux/timer.h>
+#include <linux/irq.h>
+
+#include <asm/leds.h>
+#include <asm/thread_info.h>
+#include <asm/sched_clock.h>
+#include <asm/stacktrace.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/time.h>
+
+/*
+ * Our system timer.
+ */
+static struct sys_timer *system_timer;
+
+#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) || \
+ defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE)
+/* this needs a better home */
+DEFINE_SPINLOCK(rtc_lock);
+EXPORT_SYMBOL(rtc_lock);
+#endif /* pc-style 'CMOS' RTC support */
+
+/* change this if you have some constant time drift */
+#define USECS_PER_JIFFY (1000000/HZ)
+
+#ifdef CONFIG_SMP
+unsigned long profile_pc(struct pt_regs *regs)
+{
+ struct stackframe frame;
+
+ if (!in_lock_functions(regs->ARM_pc))
+ return regs->ARM_pc;
+
+ frame.fp = regs->ARM_fp;
+ frame.sp = regs->ARM_sp;
+ frame.lr = regs->ARM_lr;
+ frame.pc = regs->ARM_pc;
+ do {
+ int ret = unwind_frame(&frame);
+ if (ret < 0)
+ return 0;
+ } while (in_lock_functions(frame.pc));
+
+ return frame.pc;
+}
+EXPORT_SYMBOL(profile_pc);
+#endif
+
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
+u32 arch_gettimeoffset(void)
+{
+ if (system_timer->offset != NULL)
+ return system_timer->offset() * 1000;
+
+ return 0;
+}
+#endif /* CONFIG_ARCH_USES_GETTIMEOFFSET */
+
+#ifdef CONFIG_LEDS_TIMER
+static inline void do_leds(void)
+{
+ static unsigned int count = HZ/2;
+
+ if (--count == 0) {
+ count = HZ/2;
+ leds_event(led_timer);
+ }
+}
+#else
+#define do_leds()
+#endif
+
+
+#ifndef CONFIG_GENERIC_CLOCKEVENTS
+/*
+ * Kernel system timer support.
+ */
+void timer_tick(void)
+{
+ profile_tick(CPU_PROFILING);
+ do_leds();
+ xtime_update(1);
+#ifndef CONFIG_SMP
+ update_process_times(user_mode(get_irq_regs()));
+#endif
+}
+#endif
+
+#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
+static int timer_suspend(void)
+{
+ if (system_timer->suspend)
+ system_timer->suspend();
+
+ return 0;
+}
+
+static void timer_resume(void)
+{
+ if (system_timer->resume)
+ system_timer->resume();
+}
+#else
+#define timer_suspend NULL
+#define timer_resume NULL
+#endif
+
+static struct syscore_ops timer_syscore_ops = {
+ .suspend = timer_suspend,
+ .resume = timer_resume,
+};
+
+static int __init timer_init_syscore_ops(void)
+{
+ register_syscore_ops(&timer_syscore_ops);
+
+ return 0;
+}
+
+device_initcall(timer_init_syscore_ops);
+
+void __init time_init(void)
+{
+ system_timer = machine_desc->timer;
+ system_timer->init();
+ sched_clock_postinit();
+}
+