| /* |
| * Copyright 2010 Tilera Corporation. All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation, version 2. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| * NON INFRINGEMENT. See the GNU General Public License for |
| * more details. |
| */ |
| |
| #ifndef _ASM_TILE_TIMEX_H |
| #define _ASM_TILE_TIMEX_H |
| |
| /* |
| * This rate should be a multiple of the possible HZ values (100, 250, 1000) |
| * and a fraction of the possible hardware timer frequencies. Our timer |
| * frequency is highly tunable but also quite precise, so for the primary use |
| * of this value (setting ACT_HZ from HZ) we just pick a value that causes |
| * ACT_HZ to be set to HZ. We make the value somewhat large just to be |
| * more robust in case someone tries out a new value of HZ. |
| */ |
| #define CLOCK_TICK_RATE 1000000 |
| |
| typedef unsigned long long cycles_t; |
| |
| #if CHIP_HAS_SPLIT_CYCLE() |
| cycles_t get_cycles(void); |
| #define get_cycles_low() __insn_mfspr(SPR_CYCLE_LOW) |
| #else |
| static inline cycles_t get_cycles(void) |
| { |
| return __insn_mfspr(SPR_CYCLE); |
| } |
| #define get_cycles_low() __insn_mfspr(SPR_CYCLE) /* just get all 64 bits */ |
| #endif |
| |
| cycles_t get_clock_rate(void); |
| |
| /* Convert nanoseconds to core clock cycles. */ |
| cycles_t ns2cycles(unsigned long nsecs); |
| |
| /* Called at cpu initialization to set some low-level constants. */ |
| void setup_clock(void); |
| |
| /* Called at cpu initialization to start the tile-timer clock device. */ |
| void setup_tile_timer(void); |
| |
| #endif /* _ASM_TILE_TIMEX_H */ |