1 files changed, 14 insertions, 5 deletions

diff --git a/drivers/media/dvb/frontends/atbm8830.c b/drivers/media/dvb/frontends/atbm8830.c
index d77684893d99..59881a5944eb 100644
--- a/drivers/media/dvb/frontends/atbm8830.c
+++ b/drivers/media/dvb/frontends/atbm8830.c
@@ -19,6 +19,7 @@
  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <asm/div64.h>
 #include "dvb_frontend.h"
 
 #include "atbm8830.h"
@@ -102,8 +103,12 @@ static inline int atbm8830_reglatch_lock(struct atbm_state *priv, int lock)
 static int set_osc_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
 {
         u32 val;
+        u64 t;
 
-        val = (u64)0x100000 * freq / 30400;
+        /* 0x100000 * freq / 30.4MHz */
+        t = (u64)0x100000 * freq;
+        do_div(t, 30400);
+        val = t;
 
         atbm8830_write_reg(priv, REG_OSC_CLK, val);
         atbm8830_write_reg(priv, REG_OSC_CLK + 1, val >> 8);
@@ -116,14 +121,18 @@ static int set_if_freq(struct atbm_state *priv, u32 freq /*in kHz*/)
 {
 
         u32 fs = priv->config->osc_clk_freq;
-        double t;
+        u64 t;
         u32 val;
         u8 dat;
 
-        t = 2 * 3.141593 * (freq - fs) / fs * (1 << 22);
-        val = t;
-
         if (freq != 0) {
+                /* 2 * PI * (freq - fs) / fs * (2 ^ 22) */
+                t = (u64) 2 * 31416 * (freq - fs);
+                t <<= 22;
+                do_div(t, fs);
+                do_div(t, 1000);
+                val = t;
+
                 atbm8830_write_reg(priv, REG_TUNER_BASEBAND, 1);
                 atbm8830_write_reg(priv, REG_IF_FREQ, val);
                 atbm8830_write_reg(priv, REG_IF_FREQ+1, val >> 8);