1#ifndef __ASMARM_ARCH_TIMER_H
 2#define __ASMARM_ARCH_TIMER_H
 3
 
 
 
 
 
 
 
 
 4#ifdef CONFIG_ARM_ARCH_TIMER
 5int arch_timer_of_register(void);
 6int arch_timer_sched_clock_init(void);
 7#else
 8static inline int arch_timer_of_register(void)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 9{
10	return -ENXIO;
 
 
11}
12
13static inline int arch_timer_sched_clock_init(void)
14{
15	return -ENXIO;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
16}
 
17#endif
18
19#endif

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef __ASMARM_ARCH_TIMER_H
  3#define __ASMARM_ARCH_TIMER_H
  4
  5#include <asm/barrier.h>
  6#include <asm/errno.h>
  7#include <linux/clocksource.h>
  8#include <linux/init.h>
  9#include <linux/types.h>
 10
 11#include <clocksource/arm_arch_timer.h>
 12
 13#ifdef CONFIG_ARM_ARCH_TIMER
 14int arch_timer_arch_init(void);
 15
 16/*
 17 * These register accessors are marked inline so the compiler can
 18 * nicely work out which register we want, and chuck away the rest of
 19 * the code. At least it does so with a recent GCC (4.6.3).
 20 */
 21static __always_inline
 22void arch_timer_reg_write_cp15(int access, enum arch_timer_reg reg, u32 val)
 23{
 24	if (access == ARCH_TIMER_PHYS_ACCESS) {
 25		switch (reg) {
 26		case ARCH_TIMER_REG_CTRL:
 27			asm volatile("mcr p15, 0, %0, c14, c2, 1" : : "r" (val));
 28			break;
 29		case ARCH_TIMER_REG_TVAL:
 30			asm volatile("mcr p15, 0, %0, c14, c2, 0" : : "r" (val));
 31			break;
 32		}
 33	} else 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	}
 43
 44	isb();
 45}
 46
 47static __always_inline
 48u32 arch_timer_reg_read_cp15(int access, enum arch_timer_reg reg)
 49{
 50	u32 val = 0;
 51
 52	if (access == ARCH_TIMER_PHYS_ACCESS) {
 53		switch (reg) {
 54		case ARCH_TIMER_REG_CTRL:
 55			asm volatile("mrc p15, 0, %0, c14, c2, 1" : "=r" (val));
 56			break;
 57		case ARCH_TIMER_REG_TVAL:
 58			asm volatile("mrc p15, 0, %0, c14, c2, 0" : "=r" (val));
 59			break;
 60		}
 61	} else if (access == ARCH_TIMER_VIRT_ACCESS) {
 62		switch (reg) {
 63		case ARCH_TIMER_REG_CTRL:
 64			asm volatile("mrc p15, 0, %0, c14, c3, 1" : "=r" (val));
 65			break;
 66		case ARCH_TIMER_REG_TVAL:
 67			asm volatile("mrc p15, 0, %0, c14, c3, 0" : "=r" (val));
 68			break;
 69		}
 70	}
 71
 72	return val;
 73}
 74
 75static inline u32 arch_timer_get_cntfrq(void)
 76{
 77	u32 val;
 78	asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (val));
 79	return val;
 80}
 81
 82static inline u64 arch_counter_get_cntpct(void)
 83{
 84	u64 cval;
 85
 86	isb();
 87	asm volatile("mrrc p15, 0, %Q0, %R0, c14" : "=r" (cval));
 88	return cval;
 89}
 90
 91static inline u64 arch_counter_get_cntvct(void)
 92{
 93	u64 cval;
 94
 95	isb();
 96	asm volatile("mrrc p15, 1, %Q0, %R0, c14" : "=r" (cval));
 97	return cval;
 98}
 99
100static inline u32 arch_timer_get_cntkctl(void)
101{
102	u32 cntkctl;
103	asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl));
104	return cntkctl;
105}
106
107static inline void arch_timer_set_cntkctl(u32 cntkctl)
108{
109	asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
110	isb();
111}
112
113#endif
114
115#endif