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
28typedef unsigned long long cycles_t;
29
30#if CHIP_HAS_SPLIT_CYCLE()
31cycles_t get_cycles(void);
32#define get_cycles_low() __insn_mfspr(SPR_CYCLE_LOW)
33#else
34static inline cycles_t get_cycles(void)
35{
36	return __insn_mfspr(SPR_CYCLE);
37}
38#define get_cycles_low() __insn_mfspr(SPR_CYCLE)   /* just get all 64 bits */
39#endif
40
41cycles_t get_clock_rate(void);
42
43/* Convert nanoseconds to core clock cycles. */
44cycles_t ns2cycles(unsigned long nsecs);
45
46/* Called at cpu initialization to set some low-level constants. */
47void setup_clock(void);
48
49/* Called at cpu initialization to start the tile-timer clock device. */
50void setup_tile_timer(void);
51
52#endif /* _ASM_TILE_TIMEX_H */
53