armv8: define usec2ticks function

usec2ticks() function has been defined for ARMv8 which will
be used by SEC Driver.

Signed-off-by: Aneesh Bansal <aneesh.bansal@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

diff --git a/arch/arm/cpu/armv8/generic_timer.c b/arch/arm/cpu/armv8/generic_timer.c
index 8e60baebc53487d17556facc322003e23dfbd15f..8f47a82043b00519100bb4e600edc23c47ac8d90 100644 (file)
--- a/arch/arm/cpu/armv8/generic_timer.c
+++ b/arch/arm/cpu/armv8/generic_timer.c
@@ -40,3 +40,14 @@ unsigned long timer_read_counter(void)
 #endif
        return cntpct;
 }
+
+unsigned long usec2ticks(unsigned long usec)
+{
+       ulong ticks;
+       if (usec < 1000)
+               ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
+       else
+               ticks = ((usec / 10) * (get_tbclk() / 100000));
+
+       return ticks;
+}