| Chris Metcalf | 867e359 | 2010-05-28 23:09:12 -0400 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation, version 2. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but |
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 11 | * NON INFRINGEMENT. See the GNU General Public License for |
| 12 | * more details. |
| 13 | */ |
| 14 | |
| 15 | #ifndef _ASM_TILE_TIMEX_H |
| 16 | #define _ASM_TILE_TIMEX_H |
| 17 | |
| 18 | /* |
| 19 | * This rate should be a multiple of the possible HZ values (100, 250, 1000) |
| 20 | * and a fraction of the possible hardware timer frequencies. Our timer |
| 21 | * frequency is highly tunable but also quite precise, so for the primary use |
| 22 | * of this value (setting ACT_HZ from HZ) we just pick a value that causes |
| 23 | * ACT_HZ to be set to HZ. We make the value somewhat large just to be |
| 24 | * more robust in case someone tries out a new value of HZ. |
| 25 | */ |
| 26 | #define CLOCK_TICK_RATE 1000000 |
| 27 | |
| 28 | typedef unsigned long long cycles_t; |
| 29 | |
| 30 | #if CHIP_HAS_SPLIT_CYCLE() |
| 31 | cycles_t get_cycles(void); |
| 32 | #else |
| 33 | static inline cycles_t get_cycles(void) |
| 34 | { |
| 35 | return __insn_mfspr(SPR_CYCLE); |
| 36 | } |
| 37 | #endif |
| 38 | |
| 39 | cycles_t get_clock_rate(void); |
| 40 | |
| 41 | /* Called at cpu initialization to set some low-level constants. */ |
| 42 | void setup_clock(void); |
| 43 | |
| 44 | /* Called at cpu initialization to start the tile-timer clock device. */ |
| 45 | void setup_tile_timer(void); |
| 46 | |
| 47 | #endif /* _ASM_TILE_TIMEX_H */ |