arch/arm/include/asm/utils.h

   1 /*
   2  * (C) Copyright 2010
   3  * Texas Instruments, <www.ti.com>
   4  * Aneesh V <aneesh@ti.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8 #ifndef _UTILS_H_
   9 #define _UTILS_H_
  10
  11 static inline s32 log_2_n_round_up(u32 n)
  12 {
  13         s32 log2n = -1;
  14         u32 temp = n;
  15
  16         while (temp) {
  17                 log2n++;
  18                 temp >>= 1;
  19         }
  20
  21         if (n & (n - 1))
  22                 return log2n + 1; /* not power of 2 - round up */
  23         else
  24                 return log2n; /* power of 2 */
  25 }
  26
  27 static inline s32 log_2_n_round_down(u32 n)
  28 {
  29         s32 log2n = -1;
  30         u32 temp = n;
  31
  32         while (temp) {
  33                 log2n++;
  34                 temp >>= 1;
  35         }
  36
  37         return log2n;
  38 }
  39
  40 #endif