| Aneesh V | 2c451f7 | 2011-06-16 23:30:47 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2010 |
| 3 | * Texas Instruments, <www.ti.com> |
| 4 | * Aneesh V <aneesh@ti.com> |
| 5 | * |
| 6 | * See file CREDITS for list of people who contributed to this |
| 7 | * project. |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU General Public License as |
| 11 | * published by the Free Software Foundation; either version 2 of |
| 12 | * the License, or (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 22 | * MA 02111-1307 USA |
| 23 | */ |
| 24 | #ifndef _UTILS_H_ |
| 25 | #define _UTILS_H_ |
| 26 | |
| 27 | static inline s32 log_2_n_round_up(u32 n) |
| 28 | { |
| 29 | s32 log2n = -1; |
| 30 | u32 temp = n; |
| 31 | |
| 32 | while (temp) { |
| 33 | log2n++; |
| 34 | temp >>= 1; |
| 35 | } |
| 36 | |
| 37 | if (n & (n - 1)) |
| 38 | return log2n + 1; /* not power of 2 - round up */ |
| 39 | else |
| 40 | return log2n; /* power of 2 */ |
| 41 | } |
| 42 | |
| 43 | static inline s32 log_2_n_round_down(u32 n) |
| 44 | { |
| 45 | s32 log2n = -1; |
| 46 | u32 temp = n; |
| 47 | |
| 48 | while (temp) { |
| 49 | log2n++; |
| 50 | temp >>= 1; |
| 51 | } |
| 52 | |
| 53 | return log2n; |
| 54 | } |
| 55 | |
| 56 | #endif |