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
get_cycles(void)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 /* Convert nanoseconds to core clock cycles. */
42 cycles_t ns2cycles(unsigned long nsecs);
43
44 /* Called at cpu initialization to set some low-level constants. */
45 void setup_clock(void);
46
47 /* Called at cpu initialization to start the tile-timer clock device. */
48 void setup_tile_timer(void);
49
50 #endif /* _ASM_TILE_TIMEX_H */
51