Merge branch 'fix/hda' into for-linus

[sfrench/cifs-2.6.git] / arch / blackfin / include / asm / delay.h

diff --git a/arch/blackfin/include/asm/delay.h b/arch/blackfin/include/asm/delay.h
index 0889c3abb593c4683a62b973de0bd8bd75013d50..c31f91cc1d5dbd5cd0677ed007c002313a784109 100644 (file)
--- a/arch/blackfin/include/asm/delay.h
+++ b/arch/blackfin/include/asm/delay.h
@@ -13,29 +13,7 @@
 
 static inline void __delay(unsigned long loops)
 {
-       if (ANOMALY_05000312) {
-               /* Interrupted loads to loop registers -> bad */
-               unsigned long tmp;
-               __asm__ __volatile__(
-                       "[--SP] = LC0;"
-                       "[--SP] = LT0;"
-                       "[--SP] = LB0;"
-                       "LSETUP (1f,1f) LC0 = %1;"
-                       "1: NOP;"
-                       /* We take advantage of the fact that LC0 is 0 at
-                        * the end of the loop.  Otherwise we'd need some
-                        * NOPs after the CLI here.
-                        */
-                       "CLI %0;"
-                       "LB0 = [SP++];"
-                       "LT0 = [SP++];"
-                       "LC0 = [SP++];"
-                       "STI %0;"
-                       : "=d" (tmp)
-                       : "a" (loops)
-               );
-       } else
-               __asm__ __volatile__ (
+__asm__ __volatile__ (
                        "LSETUP(1f, 1f) LC0 = %0;"
                        "1: NOP;"
                        :
@@ -47,16 +25,15 @@ static inline void __delay(unsigned long loops)
 #include <linux/param.h>       /* needed for HZ */
 
 /*
- * Use only for very small delays ( < 1 msec).  Should probably use a
- * lookup table, really, as the multiplications take much too long with
- * short delays.  This is a "reasonable" implementation, though (and the
- * first constant multiplications gets optimized away if the delay is
- * a constant)
+ * close approximation borrowed from m68knommu to avoid 64-bit math
  */
+
+#define        HZSCALE         (268435456 / (1000000/HZ))
+
 static inline void udelay(unsigned long usecs)
 {
        extern unsigned long loops_per_jiffy;
-       __delay(usecs * loops_per_jiffy / (1000000 / HZ));
+       __delay((((usecs * HZSCALE) >> 11) * (loops_per_jiffy >> 11)) >> 6);
 }
 
 #endif