2 * arch/arm64/include/asm/arch_timer.h
4 * Copyright (C) 2012 ARM Ltd.
5 * Author: Marc Zyngier <marc.zyngier@arm.com>
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 #ifndef __ASM_ARCH_TIMER_H
20 #define __ASM_ARCH_TIMER_H
22 #include <asm/barrier.h>
24 #include <linux/init.h>
25 #include <linux/types.h>
27 #include <clocksource/arm_arch_timer.h>
29 static inline void arch_timer_reg_write(int access, int reg, u32 val)
31 if (access == ARCH_TIMER_PHYS_ACCESS) {
33 case ARCH_TIMER_REG_CTRL:
34 asm volatile("msr cntp_ctl_el0, %0" : : "r" (val));
36 case ARCH_TIMER_REG_TVAL:
37 asm volatile("msr cntp_tval_el0, %0" : : "r" (val));
42 } else if (access == ARCH_TIMER_VIRT_ACCESS) {
44 case ARCH_TIMER_REG_CTRL:
45 asm volatile("msr cntv_ctl_el0, %0" : : "r" (val));
47 case ARCH_TIMER_REG_TVAL:
48 asm volatile("msr cntv_tval_el0, %0" : : "r" (val));
60 static inline u32 arch_timer_reg_read(int access, int reg)
64 if (access == ARCH_TIMER_PHYS_ACCESS) {
66 case ARCH_TIMER_REG_CTRL:
67 asm volatile("mrs %0, cntp_ctl_el0" : "=r" (val));
69 case ARCH_TIMER_REG_TVAL:
70 asm volatile("mrs %0, cntp_tval_el0" : "=r" (val));
75 } else if (access == ARCH_TIMER_VIRT_ACCESS) {
77 case ARCH_TIMER_REG_CTRL:
78 asm volatile("mrs %0, cntv_ctl_el0" : "=r" (val));
80 case ARCH_TIMER_REG_TVAL:
81 asm volatile("mrs %0, cntv_tval_el0" : "=r" (val));
93 static inline u32 arch_timer_get_cntfrq(void)
96 asm volatile("mrs %0, cntfrq_el0" : "=r" (val));
100 static inline void arch_counter_set_user_access(void)
104 /* Disable user access to the timers and the physical counter. */
105 asm volatile("mrs %0, cntkctl_el1" : "=r" (cntkctl));
106 cntkctl &= ~((3 << 8) | (1 << 0));
108 /* Enable user access to the virtual counter and frequency. */
110 asm volatile("msr cntkctl_el1, %0" : : "r" (cntkctl));
113 static inline u64 arch_counter_get_cntvct(void)
118 asm volatile("mrs %0, cntvct_el0" : "=r" (cval));
123 static inline int arch_timer_arch_init(void)