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
26#define CNTHCTL_EL1PCTEN		(1 << 0)
27#define CNTHCTL_EL1PCEN			(1 << 1)
28#define CNTHCTL_EVNTEN			(1 << 2)
29#define CNTHCTL_EVNTDIR			(1 << 3)
30#define CNTHCTL_EVNTI			(0xF << 4)
31
32enum arch_timer_reg {
33	ARCH_TIMER_REG_CTRL,
34	ARCH_TIMER_REG_TVAL,
35};
36
37#define ARCH_TIMER_PHYS_ACCESS		0
38#define ARCH_TIMER_VIRT_ACCESS		1
39#define ARCH_TIMER_MEM_PHYS_ACCESS	2
40#define ARCH_TIMER_MEM_VIRT_ACCESS	3
41
42#define ARCH_TIMER_USR_PCT_ACCESS_EN	(1 << 0) /* physical counter */
43#define ARCH_TIMER_USR_VCT_ACCESS_EN	(1 << 1) /* virtual counter */
44#define ARCH_TIMER_VIRT_EVT_EN		(1 << 2)
45#define ARCH_TIMER_EVT_TRIGGER_SHIFT	(4)
46#define ARCH_TIMER_EVT_TRIGGER_MASK	(0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
47#define ARCH_TIMER_USR_VT_ACCESS_EN	(1 << 8) /* virtual timer registers */
48#define ARCH_TIMER_USR_PT_ACCESS_EN	(1 << 9) /* physical timer registers */
49
50#define ARCH_TIMER_EVT_STREAM_FREQ	10000	/* 100us */
51
52#ifdef CONFIG_ARM_ARCH_TIMER
53
54extern u32 arch_timer_get_rate(void);
55extern u64 (*arch_timer_read_counter)(void);
56extern struct timecounter *arch_timer_get_timecounter(void);
57
58#else
59
60static inline u32 arch_timer_get_rate(void)
61{
62	return 0;
63}
64
65static inline u64 arch_timer_read_counter(void)
66{
67	return 0;
68}
69
70static inline struct timecounter *arch_timer_get_timecounter(void)
71{
72	return NULL;
73}
74
75#endif
76
77#endif