1/*
2 * Copyright (C) 2012 ARM Ltd.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
15 */
16#ifndef __CLKSOURCE_ARM_ARCH_TIMER_H
17#define __CLKSOURCE_ARM_ARCH_TIMER_H
18
19#include <linux/timecounter.h>
20#include <linux/types.h>
21
22#define ARCH_TIMER_CTRL_ENABLE		(1 << 0)
23#define ARCH_TIMER_CTRL_IT_MASK		(1 << 1)
24#define ARCH_TIMER_CTRL_IT_STAT		(1 << 2)
25
26enum arch_timer_reg {
27	ARCH_TIMER_REG_CTRL,
28	ARCH_TIMER_REG_TVAL,
29};
30
31#define ARCH_TIMER_PHYS_ACCESS		0
32#define ARCH_TIMER_VIRT_ACCESS		1
33#define ARCH_TIMER_MEM_PHYS_ACCESS	2
34#define ARCH_TIMER_MEM_VIRT_ACCESS	3
35
36#define ARCH_TIMER_USR_PCT_ACCESS_EN	(1 << 0) /* physical counter */
37#define ARCH_TIMER_USR_VCT_ACCESS_EN	(1 << 1) /* virtual counter */
38#define ARCH_TIMER_VIRT_EVT_EN		(1 << 2)
39#define ARCH_TIMER_EVT_TRIGGER_SHIFT	(4)
40#define ARCH_TIMER_EVT_TRIGGER_MASK	(0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
41#define ARCH_TIMER_USR_VT_ACCESS_EN	(1 << 8) /* virtual timer registers */
42#define ARCH_TIMER_USR_PT_ACCESS_EN	(1 << 9) /* physical timer registers */
43
44#define ARCH_TIMER_EVT_STREAM_FREQ	10000	/* 100us */
45
46#ifdef CONFIG_ARM_ARCH_TIMER
47
48extern u32 arch_timer_get_rate(void);
49extern u64 (*arch_timer_read_counter)(void);
50extern struct timecounter *arch_timer_get_timecounter(void);
51
52#else
53
54static inline u32 arch_timer_get_rate(void)
55{
56	return 0;
57}
58
59static inline u64 arch_timer_read_counter(void)
60{
61	return 0;
62}
63
64static inline struct timecounter *arch_timer_get_timecounter(void)
65{
66	return NULL;
67}
68
69#endif
70
71#endif
72