1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * arch/arm64/include/asm/arch_timer.h
5 * Copyright (C) 2012 ARM Ltd.
6 * Author: Marc Zyngier <marc.zyngier@arm.com>
8 #ifndef __ASM_ARCH_TIMER_H
9 #define __ASM_ARCH_TIMER_H
11 #include <asm/barrier.h>
12 #include <asm/hwcap.h>
13 #include <asm/sysreg.h>
15 #include <linux/bug.h>
16 #include <linux/init.h>
17 #include <linux/jump_label.h>
18 #include <linux/smp.h>
19 #include <linux/types.h>
21 #include <clocksource/arm_arch_timer.h>
23 #if IS_ENABLED(CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND)
24 #define has_erratum_handler(h) \
26 const struct arch_timer_erratum_workaround *__wa; \
27 __wa = __this_cpu_read(timer_unstable_counter_workaround); \
31 #define erratum_handler(h) \
33 const struct arch_timer_erratum_workaround *__wa; \
34 __wa = __this_cpu_read(timer_unstable_counter_workaround); \
35 (__wa && __wa->h) ? __wa->h : arch_timer_##h; \
39 #define has_erratum_handler(h) false
40 #define erratum_handler(h) (arch_timer_##h)
43 enum arch_timer_erratum_match_type {
45 ate_match_local_cap_id,
46 ate_match_acpi_oem_info,
49 struct clock_event_device;
51 struct arch_timer_erratum_workaround {
52 enum arch_timer_erratum_match_type match_type;
55 u32 (*read_cntp_tval_el0)(void);
56 u32 (*read_cntv_tval_el0)(void);
57 u64 (*read_cntpct_el0)(void);
58 u64 (*read_cntvct_el0)(void);
59 int (*set_next_event_phys)(unsigned long, struct clock_event_device *);
60 int (*set_next_event_virt)(unsigned long, struct clock_event_device *);
61 bool disable_compat_vdso;
64 DECLARE_PER_CPU(const struct arch_timer_erratum_workaround *,
65 timer_unstable_counter_workaround);
67 /* inline sysreg accessors that make erratum_handler() work */
68 static inline notrace u32 arch_timer_read_cntp_tval_el0(void)
70 return read_sysreg(cntp_tval_el0);
73 static inline notrace u32 arch_timer_read_cntv_tval_el0(void)
75 return read_sysreg(cntv_tval_el0);
78 static inline notrace u64 arch_timer_read_cntpct_el0(void)
80 return read_sysreg(cntpct_el0);
83 static inline notrace u64 arch_timer_read_cntvct_el0(void)
85 return read_sysreg(cntvct_el0);
88 #define arch_timer_reg_read_stable(reg) \
92 preempt_disable_notrace(); \
93 _val = erratum_handler(read_ ## reg)(); \
94 preempt_enable_notrace(); \
100 * These register accessors are marked inline so the compiler can
101 * nicely work out which register we want, and chuck away the rest of
104 static __always_inline
105 void arch_timer_reg_write_cp15(int access, enum arch_timer_reg reg, u32 val)
107 if (access == ARCH_TIMER_PHYS_ACCESS) {
109 case ARCH_TIMER_REG_CTRL:
110 write_sysreg(val, cntp_ctl_el0);
112 case ARCH_TIMER_REG_TVAL:
113 write_sysreg(val, cntp_tval_el0);
116 } else if (access == ARCH_TIMER_VIRT_ACCESS) {
118 case ARCH_TIMER_REG_CTRL:
119 write_sysreg(val, cntv_ctl_el0);
121 case ARCH_TIMER_REG_TVAL:
122 write_sysreg(val, cntv_tval_el0);
130 static __always_inline
131 u32 arch_timer_reg_read_cp15(int access, enum arch_timer_reg reg)
133 if (access == ARCH_TIMER_PHYS_ACCESS) {
135 case ARCH_TIMER_REG_CTRL:
136 return read_sysreg(cntp_ctl_el0);
137 case ARCH_TIMER_REG_TVAL:
138 return arch_timer_reg_read_stable(cntp_tval_el0);
140 } else if (access == ARCH_TIMER_VIRT_ACCESS) {
142 case ARCH_TIMER_REG_CTRL:
143 return read_sysreg(cntv_ctl_el0);
144 case ARCH_TIMER_REG_TVAL:
145 return arch_timer_reg_read_stable(cntv_tval_el0);
152 static inline u32 arch_timer_get_cntfrq(void)
154 return read_sysreg(cntfrq_el0);
157 static inline u32 arch_timer_get_cntkctl(void)
159 return read_sysreg(cntkctl_el1);
162 static inline void arch_timer_set_cntkctl(u32 cntkctl)
164 write_sysreg(cntkctl, cntkctl_el1);
168 static __always_inline u64 __arch_counter_get_cntpct_stable(void)
173 cnt = arch_timer_reg_read_stable(cntpct_el0);
174 arch_counter_enforce_ordering(cnt);
178 static __always_inline u64 __arch_counter_get_cntpct(void)
183 cnt = read_sysreg(cntpct_el0);
184 arch_counter_enforce_ordering(cnt);
188 static __always_inline u64 __arch_counter_get_cntvct_stable(void)
193 cnt = arch_timer_reg_read_stable(cntvct_el0);
194 arch_counter_enforce_ordering(cnt);
198 static __always_inline u64 __arch_counter_get_cntvct(void)
203 cnt = read_sysreg(cntvct_el0);
204 arch_counter_enforce_ordering(cnt);
208 static inline int arch_timer_arch_init(void)
213 static inline void arch_timer_set_evtstrm_feature(void)
215 cpu_set_named_feature(EVTSTRM);
217 compat_elf_hwcap |= COMPAT_HWCAP_EVTSTRM;
221 static inline bool arch_timer_have_evtstrm_feature(void)
223 return cpu_have_named_feature(EVTSTRM);