summaryrefslogtreecommitdiffstats
path: root/arch/arm/include/asm/arch_timer.h
blob: 0704e0cf557146da78c086079daeec8c0112d326 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
#ifndef __ASMARM_ARCH_TIMER_H
#define __ASMARM_ARCH_TIMER_H

#include <asm/barrier.h>
#include <asm/errno.h>
#include <linux/clocksource.h>
#include <linux/init.h>
#include <linux/types.h>

#include <clocksource/arm_arch_timer.h>

#ifdef CONFIG_ARM_ARCH_TIMER
int arch_timer_arch_init(void);

/*
 * These register accessors are marked inline so the compiler can
 * nicely work out which register we want, and chuck away the rest of
 * the code. At least it does so with a recent GCC (4.6.3).
 */
static __always_inline
void arch_timer_reg_write_cp15(int access, enum arch_timer_reg reg, u32 val)
{
	if (access == ARCH_TIMER_PHYS_ACCESS) {
		switch (reg) {
		case ARCH_TIMER_REG_CTRL:
			asm volatile("mcr p15, 0, %0, c14, c2, 1" : : "r" (val));
			break;
		case ARCH_TIMER_REG_TVAL:
			asm volatile("mcr p15, 0, %0, c14, c2, 0" : : "r" (val));
			break;
		}
	} else if (access == ARCH_TIMER_VIRT_ACCESS) {
		switch (reg) {
		case ARCH_TIMER_REG_CTRL:
			asm volatile("mcr p15, 0, %0, c14, c3, 1" : : "r" (val));
			break;
		case ARCH_TIMER_REG_TVAL:
			asm volatile("mcr p15, 0, %0, c14, c3, 0" : : "r" (val));
			break;
		}
	}

	isb();
}

static __always_inline
u32 arch_timer_reg_read_cp15(int access, enum arch_timer_reg reg)
{
	u32 val = 0;

	if (access == ARCH_TIMER_PHYS_ACCESS) {
		switch (reg) {
		case ARCH_TIMER_REG_CTRL:
			asm volatile("mrc p15, 0, %0, c14, c2, 1" : "=r" (val));
			break;
		case ARCH_TIMER_REG_TVAL:
			asm volatile("mrc p15, 0, %0, c14, c2, 0" : "=r" (val));
			break;
		}
	} else if (access == ARCH_TIMER_VIRT_ACCESS) {
		switch (reg) {
		case ARCH_TIMER_REG_CTRL:
			asm volatile("mrc p15, 0, %0, c14, c3, 1" : "=r" (val));
			break;
		case ARCH_TIMER_REG_TVAL:
			asm volatile("mrc p15, 0, %0, c14, c3, 0" : "=r" (val));
			break;
		}
	}

	return val;
}

static inline u32 arch_timer_get_cntfrq(void)
{
	u32 val;
	asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (val));
	return val;
}

static inline u64 arch_counter_get_cntvct(void)
{
	u64 cval;

	isb();
	asm volatile("mrrc p15, 1, %Q0, %R0, c14" : "=r" (cval));
	return cval;
}

static inline u32 arch_timer_get_cntkctl(void)
{
	u32 cntkctl;
	asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl));
	return cntkctl;
}

static inline void arch_timer_set_cntkctl(u32 cntkctl)
{
	asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
}

static inline void arch_counter_set_user_access(void)
{
	u32 cntkctl = arch_timer_get_cntkctl();

	/* Disable user access to both physical/virtual counters/timers */
	/* Also disable virtual event stream */
	cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
			| ARCH_TIMER_USR_VT_ACCESS_EN
			| ARCH_TIMER_VIRT_EVT_EN
			| ARCH_TIMER_USR_VCT_ACCESS_EN
			| ARCH_TIMER_USR_PCT_ACCESS_EN);
	arch_timer_set_cntkctl(cntkctl);
}

static inline void arch_timer_evtstrm_enable(int divider)
{
	u32 cntkctl = arch_timer_get_cntkctl();
	cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
	/* Set the divider and enable virtual event stream */
	cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
			| ARCH_TIMER_VIRT_EVT_EN;
	arch_timer_set_cntkctl(cntkctl);
	elf_hwcap |= HWCAP_EVTSTRM;
}

#endif

#endif