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Marc Zyngier022c03a2012-01-11 17:25:17 +00001#ifndef __ASMARM_ARCH_TIMER_H
2#define __ASMARM_ARCH_TIMER_H
3
Mark Rutlandec944c92012-11-12 16:18:00 +00004#include <asm/barrier.h>
Will Deacon923df96b2012-07-06 15:46:45 +01005#include <asm/errno.h>
Marc Zyngiera1b2dde2012-09-07 18:09:58 +01006#include <linux/clocksource.h>
Mark Rutland8a4da6e2012-11-12 14:33:44 +00007#include <linux/init.h>
Mark Rutlandec944c92012-11-12 16:18:00 +00008#include <linux/types.h>
Will Deacon923df96b2012-07-06 15:46:45 +01009
Mark Rutland8a4da6e2012-11-12 14:33:44 +000010#include <clocksource/arm_arch_timer.h>
11
Marc Zyngier022c03a2012-01-11 17:25:17 +000012#ifdef CONFIG_ARM_ARCH_TIMER
Rob Herring0583fe42013-04-10 18:27:51 -050013int arch_timer_arch_init(void);
Mark Rutlandec944c92012-11-12 16:18:00 +000014
15/*
16 * These register accessors are marked inline so the compiler can
17 * nicely work out which register we want, and chuck away the rest of
18 * the code. At least it does so with a recent GCC (4.6.3).
19 */
20static inline void arch_timer_reg_write(const int access, const int reg, u32 val)
21{
22 if (access == ARCH_TIMER_PHYS_ACCESS) {
23 switch (reg) {
24 case ARCH_TIMER_REG_CTRL:
25 asm volatile("mcr p15, 0, %0, c14, c2, 1" : : "r" (val));
26 break;
27 case ARCH_TIMER_REG_TVAL:
28 asm volatile("mcr p15, 0, %0, c14, c2, 0" : : "r" (val));
29 break;
30 }
31 }
32
33 if (access == ARCH_TIMER_VIRT_ACCESS) {
34 switch (reg) {
35 case ARCH_TIMER_REG_CTRL:
36 asm volatile("mcr p15, 0, %0, c14, c3, 1" : : "r" (val));
37 break;
38 case ARCH_TIMER_REG_TVAL:
39 asm volatile("mcr p15, 0, %0, c14, c3, 0" : : "r" (val));
40 break;
41 }
42 }
Mark Rutland45801042013-01-11 14:32:33 +000043
44 isb();
Mark Rutlandec944c92012-11-12 16:18:00 +000045}
46
47static inline u32 arch_timer_reg_read(const int access, const int reg)
48{
49 u32 val = 0;
50
51 if (access == ARCH_TIMER_PHYS_ACCESS) {
52 switch (reg) {
53 case ARCH_TIMER_REG_CTRL:
54 asm volatile("mrc p15, 0, %0, c14, c2, 1" : "=r" (val));
55 break;
56 case ARCH_TIMER_REG_TVAL:
57 asm volatile("mrc p15, 0, %0, c14, c2, 0" : "=r" (val));
58 break;
59 }
60 }
61
62 if (access == ARCH_TIMER_VIRT_ACCESS) {
63 switch (reg) {
64 case ARCH_TIMER_REG_CTRL:
65 asm volatile("mrc p15, 0, %0, c14, c3, 1" : "=r" (val));
66 break;
67 case ARCH_TIMER_REG_TVAL:
68 asm volatile("mrc p15, 0, %0, c14, c3, 0" : "=r" (val));
69 break;
70 }
71 }
72
73 return val;
74}
75
76static inline u32 arch_timer_get_cntfrq(void)
77{
78 u32 val;
79 asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (val));
80 return val;
81}
82
Mark Rutlandec944c92012-11-12 16:18:00 +000083static inline u64 arch_counter_get_cntvct(void)
84{
85 u64 cval;
86
Mark Rutland45801042013-01-11 14:32:33 +000087 isb();
Mark Rutlandec944c92012-11-12 16:18:00 +000088 asm volatile("mrrc p15, 1, %Q0, %R0, c14" : "=r" (cval));
89 return cval;
90}
Mark Rutlandb2deabe2012-11-14 10:32:24 +000091
Sudeep KarkadaNagesha7896a032013-08-13 14:30:32 +010092static inline u32 arch_timer_get_cntkctl(void)
Mark Rutlandb2deabe2012-11-14 10:32:24 +000093{
94 u32 cntkctl;
Mark Rutlandb2deabe2012-11-14 10:32:24 +000095 asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl));
Sudeep KarkadaNagesha7896a032013-08-13 14:30:32 +010096 return cntkctl;
97}
98
99static inline void arch_timer_set_cntkctl(u32 cntkctl)
100{
101 asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
102}
103
104static inline void __cpuinit arch_counter_set_user_access(void)
105{
106 u32 cntkctl = arch_timer_get_cntkctl();
Mark Rutlandb2deabe2012-11-14 10:32:24 +0000107
Sudeep KarkadaNageshac0a8e8a2013-08-13 13:43:26 +0100108 /* Disable user access to both physical/virtual counters/timers */
109 /* Also disable virtual event stream */
110 cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
111 | ARCH_TIMER_USR_VT_ACCESS_EN
112 | ARCH_TIMER_VIRT_EVT_EN
113 | ARCH_TIMER_USR_VCT_ACCESS_EN
114 | ARCH_TIMER_USR_PCT_ACCESS_EN);
Sudeep KarkadaNagesha7896a032013-08-13 14:30:32 +0100115 arch_timer_set_cntkctl(cntkctl);
Mark Rutlandb2deabe2012-11-14 10:32:24 +0000116}
Sudeep KarkadaNagesha7896a032013-08-13 14:30:32 +0100117
118static inline void arch_timer_evtstrm_enable(int divider)
119{
120 u32 cntkctl = arch_timer_get_cntkctl();
121 cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
122 /* Set the divider and enable virtual event stream */
123 cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
124 | ARCH_TIMER_VIRT_EVT_EN;
125 arch_timer_set_cntkctl(cntkctl);
126 elf_hwcap |= HWCAP_EVTSTRM;
127}
128
Marc Zyngier022c03a2012-01-11 17:25:17 +0000129#endif
130
131#endif