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>
23 #include <asm/sysreg.h>
25 #include <linux/bug.h>
26 #include <linux/init.h>
27 #include <linux/types.h>
29 #include <clocksource/arm_arch_timer.h>
32 * These register accessors are marked inline so the compiler can
33 * nicely work out which register we want, and chuck away the rest of
36 static __always_inline
37 void arch_timer_reg_write_cp15(int access
, enum arch_timer_reg reg
, u32 val
)
39 if (access
== ARCH_TIMER_PHYS_ACCESS
) {
41 case ARCH_TIMER_REG_CTRL
:
42 write_sysreg(val
, cntp_ctl_el0
);
44 case ARCH_TIMER_REG_TVAL
:
45 write_sysreg(val
, cntp_tval_el0
);
48 } else if (access
== ARCH_TIMER_VIRT_ACCESS
) {
50 case ARCH_TIMER_REG_CTRL
:
51 write_sysreg(val
, cntv_ctl_el0
);
53 case ARCH_TIMER_REG_TVAL
:
54 write_sysreg(val
, cntv_tval_el0
);
62 static __always_inline
63 u32
arch_timer_reg_read_cp15(int access
, enum arch_timer_reg reg
)
65 if (access
== ARCH_TIMER_PHYS_ACCESS
) {
67 case ARCH_TIMER_REG_CTRL
:
68 return read_sysreg(cntp_ctl_el0
);
69 case ARCH_TIMER_REG_TVAL
:
70 return read_sysreg(cntp_tval_el0
);
72 } else if (access
== ARCH_TIMER_VIRT_ACCESS
) {
74 case ARCH_TIMER_REG_CTRL
:
75 return read_sysreg(cntv_ctl_el0
);
76 case ARCH_TIMER_REG_TVAL
:
77 return read_sysreg(cntv_tval_el0
);
84 static inline u32
arch_timer_get_cntfrq(void)
86 return read_sysreg(cntfrq_el0
);
89 static inline u32
arch_timer_get_cntkctl(void)
91 return read_sysreg(cntkctl_el1
);
94 static inline void arch_timer_set_cntkctl(u32 cntkctl
)
96 write_sysreg(cntkctl
, cntkctl_el1
);
99 static inline u64
arch_counter_get_cntpct(void)
102 * AArch64 kernel and user space mandate the use of CNTVCT.
108 static inline u64
arch_counter_get_cntvct(void)
111 return read_sysreg(cntvct_el0
);
114 static inline int arch_timer_arch_init(void)
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