ARM: 6234/1: move SPEAr to use common mult/shift calculation code

Since the infrastructure for determining shift/mult values from a
clock rate and a minimum programmable rate is now in the kernel,
lets remove this custom code.

Cc: Viresh KUMAR <viresh.kumar@st.com>
Tested-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 40 deletions

diff --git a/arch/arm/plat-spear/time.c b/arch/arm/plat-spear/time.c
index a1025d38f383..ab211652e4ca 100644
--- a/arch/arm/plat-spear/time.c
+++ b/arch/arm/plat-spear/time.c
@@ -58,6 +58,11 @@
 
 #define INT_STATUS              0x1
 
+/*
+ * Minimum clocksource/clockevent timer range in seconds
+ */
+#define SPEAR_MIN_RANGE 4
+
 static __iomem void *gpt_base;
 static struct clk *gpt_clk;
 
@@ -66,44 +71,6 @@ static void clockevent_set_mode(enum clock_event_mode mode,
 static int clockevent_next_event(unsigned long evt,
                                  struct clock_event_device *clk_event_dev);
 
-/*
- * Following clocksource_set_clock and clockevent_set_clock picked
- * from arch/mips/kernel/time.c
- */
-
-void __init clocksource_set_clock(struct clocksource *cs, unsigned int clock)
-{
-        u64 temp;
-        u32 shift;
-
-        /* Find a shift value */
-        for (shift = 32; shift > 0; shift--) {
-                temp = (u64) NSEC_PER_SEC << shift;
-                do_div(temp, clock);
-                if ((temp >> 32) == 0)
-                        break;
-        }
-        cs->shift = shift;
-        cs->mult = (u32) temp;
-}
-
-void __init clockevent_set_clock(struct clock_event_device *cd,
-        unsigned int clock)
-{
-        u64 temp;
-        u32 shift;
-
-        /* Find a shift value */
-        for (shift = 32; shift > 0; shift--) {
-                temp = (u64) clock << shift;
-                do_div(temp, NSEC_PER_SEC);
-                if ((temp >> 32) == 0)
-                        break;
-        }
-        cd->shift = shift;
-        cd->mult = (u32) temp;
-}
-
 static cycle_t clocksource_read_cycles(struct clocksource *cs)
 {
         return (cycle_t) readw(gpt_base + COUNT(CLKSRC));
@@ -138,7 +105,7 @@ static void spear_clocksource_init(void)
         val |= CTRL_ENABLE ;
         writew(val, gpt_base + CR(CLKSRC));
 
-        clocksource_set_clock(&clksrc, tick_rate);
+        clocksource_calc_mult_shift(&clksrc, tick_rate, SPEAR_MIN_RANGE);
 
         /* register the clocksource */
         clocksource_register(&clksrc);
@@ -233,7 +200,7 @@ static void __init spear_clockevent_init(void)
         tick_rate = clk_get_rate(gpt_clk);
         tick_rate >>= CTRL_PRESCALER16;
 
-        clockevent_set_clock(&clkevt, tick_rate);
+        clockevents_calc_mult_shift(&clkevt, tick_rate, SPEAR_MIN_RANGE);
 
         clkevt.max_delta_ns = clockevent_delta2ns(0xfff0,
                         &clkevt);