Exynos: Add timer_get_us function

[karo-tx-uboot.git] / arch / arm / cpu / armv7 / s5p-common / timer.c

diff --git a/arch/arm/cpu/armv7/s5p-common/timer.c b/arch/arm/cpu/armv7/s5p-common/timer.c
index c48a297702e6822781a0ea228b1c734d37797470..de6140516c849493a5aa0d613bcdb8f69a457532 100644 (file)
--- a/arch/arm/cpu/armv7/s5p-common/timer.c
+++ b/arch/arm/cpu/armv7/s5p-common/timer.c
@@ -90,6 +90,21 @@ unsigned long get_timer(unsigned long base)
        return gd->arch.timer_reset_value / 1000 - base;
 }
 
+unsigned long timer_get_us(void)
+{
+       static unsigned long base_time_us;
+
+       struct s5p_timer *const timer =
+               (struct s5p_timer *)samsung_get_base_timer();
+       unsigned long now_downward_us = readl(&timer->tcnto4);
+
+       if (!base_time_us)
+               base_time_us = now_downward_us;
+
+       /* Note that this timer counts downward. */
+       return base_time_us - now_downward_us;
+}
+
 /* delay x useconds */
 void __udelay(unsigned long usec)
 {