1 files changed, 17 insertions, 11 deletions

diff --git a/arch/arm/mach-u300/timer.c b/arch/arm/mach-u300/timer.c
index 26d26f5100fe..3fc4472719be 100644
--- a/arch/arm/mach-u300/timer.c
+++ b/arch/arm/mach-u300/timer.c
@@ -15,6 +15,8 @@
 #include <linux/clocksource.h>
 #include <linux/types.h>
 #include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
 
 #include <mach/hardware.h>
 
@@ -23,7 +25,8 @@
 #include <asm/mach/time.h>
 #include <asm/mach/irq.h>
 
-#include "clock.h"
+/* Be able to sleep for atleast 4 seconds (usually more) */
+#define APPTIMER_MIN_RANGE 4
 
 /*
  * APP side special timer registers
@@ -307,8 +310,6 @@ static struct clock_event_device clockevent_u300_1mhz = {
         .name           = "GPT1",
         .rating         = 300, /* Reasonably fast and accurate clock event */
         .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-        /* 22 calculated using the algorithm in arch/mips/kernel/time.c */
-        .shift          = 22,
         .set_next_event = u300_set_next_event,
         .set_mode       = u300_set_mode,
 };
@@ -341,8 +342,6 @@ static struct clocksource clocksource_u300_1mhz = {
         .rating         = 300, /* Reasonably fast and accurate clock source */
         .read           = u300_get_cycles,
         .mask           = CLOCKSOURCE_MASK(32), /* 32 bits */
-        /* 22 calculated using the algorithm in arch/mips/kernel/time.c */
-        .shift          = 22,
         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
@@ -367,7 +366,15 @@ unsigned long long notrace sched_clock(void)
  */
 static void __init u300_timer_init(void)
 {
-        u300_enable_timer_clock();
+        struct clk *clk;
+        unsigned long rate;
+
+        /* Clock the interrupt controller */
+        clk = clk_get_sys("apptimer", NULL);
+        BUG_ON(IS_ERR(clk));
+        clk_enable(clk);
+        rate = clk_get_rate(clk);
+
         /*
          * Disable the "OS" and "DD" timers - these are designed for Symbian!
          * Example usage in cnh1601578 cpu subsystem pd_timer_app.c
@@ -405,15 +412,14 @@ static void __init u300_timer_init(void)
         writel(U300_TIMER_APP_EGPT2_TIMER_ENABLE,
                 U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT2);
 
-        /* This is a pure microsecond clock source */
-        clocksource_u300_1mhz.mult =
-                clocksource_khz2mult(1000, clocksource_u300_1mhz.shift);
+        clocksource_calc_mult_shift(&clocksource_u300_1mhz,
+                                    rate, APPTIMER_MIN_RANGE);
         if (clocksource_register(&clocksource_u300_1mhz))
                 printk(KERN_ERR "timer: failed to initialize clock "
                        "source %s\n", clocksource_u300_1mhz.name);
 
-        clockevent_u300_1mhz.mult =
-                div_sc(1000000, NSEC_PER_SEC, clockevent_u300_1mhz.shift);
+        clockevents_calc_mult_shift(&clockevent_u300_1mhz,
+                                    rate, APPTIMER_MIN_RANGE);
         /* 32bit counter, so 32bits delta is max */
         clockevent_u300_1mhz.max_delta_ns =
                 clockevent_delta2ns(0xffffffff, &clockevent_u300_1mhz);