clk: bcm/kona: use DIV_ROUND_CLOSEST_ULL()

Now that the kernel provides DIV_ROUND_CLOSEST_ULL(), drop the internal
implementation and use the kernel one.

Signed-off-by: Javi Merino <javi.merino@arm.com>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Alex Elder <elder@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 21 deletions

diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c
index 05abae89262e..a0ef4f75d457 100644
--- a/drivers/clk/bcm/clk-kona.c
+++ b/drivers/clk/bcm/clk-kona.c
@@ -15,6 +15,7 @@
 #include "clk-kona.h"
 
 #include <linux/delay.h>
+#include <linux/kernel.h>
 
 /*
  * "Policies" affect the frequencies of bus clocks provided by a
@@ -51,21 +52,6 @@ static inline u32 bitfield_replace(u32 reg_val, u32 shift, u32 width, u32 val)
 
 /* Divider and scaling helpers */
 
-/*
- * Implement DIV_ROUND_CLOSEST() for 64-bit dividend and both values
- * unsigned.  Note that unlike do_div(), the remainder is discarded
- * and the return value is the quotient (not the remainder).
- */
-u64 do_div_round_closest(u64 dividend, unsigned long divisor)
-{
-        u64 result;
-
-        result = dividend + ((u64)divisor >> 1);
-        (void)do_div(result, divisor);
-
-        return result;
-}
-
 /* Convert a divider into the scaled divisor value it represents. */
 static inline u64 scaled_div_value(struct bcm_clk_div *div, u32 reg_div)
 {
@@ -87,7 +73,7 @@ u64 scaled_div_build(struct bcm_clk_div *div, u32 div_value, u32 billionths)
         combined = (u64)div_value * BILLION + billionths;
         combined <<= div->u.s.frac_width;
 
-        return do_div_round_closest(combined, BILLION);
+        return DIV_ROUND_CLOSEST_ULL(combined, BILLION);
 }
 
 /* The scaled minimum divisor representable by a divider */
@@ -731,7 +717,7 @@ static unsigned long clk_recalc_rate(struct ccu_data *ccu,
                 scaled_rate = scale_rate(pre_div, parent_rate);
                 scaled_rate = scale_rate(div, scaled_rate);
                 scaled_div = divider_read_scaled(ccu, pre_div);
-                scaled_parent_rate = do_div_round_closest(scaled_rate,
+                scaled_parent_rate = DIV_ROUND_CLOSEST_ULL(scaled_rate,
                                                         scaled_div);
         } else  {
                 scaled_parent_rate = scale_rate(div, parent_rate);
@@ -743,7 +729,7 @@ static unsigned long clk_recalc_rate(struct ccu_data *ccu,
          * rate.
          */
         scaled_div = divider_read_scaled(ccu, div);
-        result = do_div_round_closest(scaled_parent_rate, scaled_div);
+        result = DIV_ROUND_CLOSEST_ULL(scaled_parent_rate, scaled_div);
 
         return (unsigned long)result;
 }
@@ -790,7 +776,7 @@ static long round_rate(struct ccu_data *ccu, struct bcm_clk_div *div,
                 scaled_rate = scale_rate(pre_div, parent_rate);
                 scaled_rate = scale_rate(div, scaled_rate);
                 scaled_pre_div = divider_read_scaled(ccu, pre_div);
-                scaled_parent_rate = do_div_round_closest(scaled_rate,
+                scaled_parent_rate = DIV_ROUND_CLOSEST_ULL(scaled_rate,
                                                         scaled_pre_div);
         } else {
                 scaled_parent_rate = scale_rate(div, parent_rate);
@@ -802,7 +788,7 @@ static long round_rate(struct ccu_data *ccu, struct bcm_clk_div *div,
          * the best we can do.
          */
         if (!divider_is_fixed(div)) {
-                best_scaled_div = do_div_round_closest(scaled_parent_rate,
+                best_scaled_div = DIV_ROUND_CLOSEST_ULL(scaled_parent_rate,
                                                         rate);
                 min_scaled_div = scaled_div_min(div);
                 max_scaled_div = scaled_div_max(div);
@@ -815,7 +801,7 @@ static long round_rate(struct ccu_data *ccu, struct bcm_clk_div *div,
         }
 
         /* OK, figure out the resulting rate */
-        result = do_div_round_closest(scaled_parent_rate, best_scaled_div);
+        result = DIV_ROUND_CLOSEST_ULL(scaled_parent_rate, best_scaled_div);
 
         if (scaled_div)
                 *scaled_div = best_scaled_div;