forked from Minki/linux
0064030c6f
Should we ever have a workaround for an erratum that is detected using a capability and affecting a particular CPU, it'd be nice to have a way to probe them directly. Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
155 lines
3.6 KiB
C
155 lines
3.6 KiB
C
/*
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* arch/arm64/include/asm/arch_timer.h
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*
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* Copyright (C) 2012 ARM Ltd.
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_ARCH_TIMER_H
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#define __ASM_ARCH_TIMER_H
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#include <asm/barrier.h>
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#include <asm/sysreg.h>
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#include <linux/bug.h>
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#include <linux/init.h>
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#include <linux/jump_label.h>
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#include <linux/types.h>
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#include <clocksource/arm_arch_timer.h>
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#if IS_ENABLED(CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND)
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extern struct static_key_false arch_timer_read_ool_enabled;
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#define needs_unstable_timer_counter_workaround() \
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static_branch_unlikely(&arch_timer_read_ool_enabled)
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#else
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#define needs_unstable_timer_counter_workaround() false
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#endif
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enum arch_timer_erratum_match_type {
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ate_match_dt,
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ate_match_local_cap_id,
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};
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struct arch_timer_erratum_workaround {
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enum arch_timer_erratum_match_type match_type;
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const void *id;
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const char *desc;
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u32 (*read_cntp_tval_el0)(void);
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u32 (*read_cntv_tval_el0)(void);
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u64 (*read_cntvct_el0)(void);
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};
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extern const struct arch_timer_erratum_workaround *timer_unstable_counter_workaround;
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#define arch_timer_reg_read_stable(reg) \
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({ \
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u64 _val; \
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if (needs_unstable_timer_counter_workaround()) \
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_val = timer_unstable_counter_workaround->read_##reg();\
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else \
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_val = read_sysreg(reg); \
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_val; \
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})
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/*
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* These register accessors are marked inline so the compiler can
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* nicely work out which register we want, and chuck away the rest of
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* the code.
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*/
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static __always_inline
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void arch_timer_reg_write_cp15(int access, enum arch_timer_reg reg, u32 val)
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{
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if (access == ARCH_TIMER_PHYS_ACCESS) {
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switch (reg) {
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case ARCH_TIMER_REG_CTRL:
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write_sysreg(val, cntp_ctl_el0);
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break;
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case ARCH_TIMER_REG_TVAL:
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write_sysreg(val, cntp_tval_el0);
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break;
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}
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} else if (access == ARCH_TIMER_VIRT_ACCESS) {
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switch (reg) {
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case ARCH_TIMER_REG_CTRL:
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write_sysreg(val, cntv_ctl_el0);
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break;
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case ARCH_TIMER_REG_TVAL:
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write_sysreg(val, cntv_tval_el0);
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break;
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}
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}
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isb();
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}
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static __always_inline
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u32 arch_timer_reg_read_cp15(int access, enum arch_timer_reg reg)
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{
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if (access == ARCH_TIMER_PHYS_ACCESS) {
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switch (reg) {
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case ARCH_TIMER_REG_CTRL:
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return read_sysreg(cntp_ctl_el0);
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case ARCH_TIMER_REG_TVAL:
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return arch_timer_reg_read_stable(cntp_tval_el0);
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}
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} else if (access == ARCH_TIMER_VIRT_ACCESS) {
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switch (reg) {
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case ARCH_TIMER_REG_CTRL:
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return read_sysreg(cntv_ctl_el0);
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case ARCH_TIMER_REG_TVAL:
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return arch_timer_reg_read_stable(cntv_tval_el0);
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}
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}
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BUG();
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}
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static inline u32 arch_timer_get_cntfrq(void)
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{
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return read_sysreg(cntfrq_el0);
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}
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static inline u32 arch_timer_get_cntkctl(void)
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{
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return read_sysreg(cntkctl_el1);
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}
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static inline void arch_timer_set_cntkctl(u32 cntkctl)
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{
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write_sysreg(cntkctl, cntkctl_el1);
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}
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static inline u64 arch_counter_get_cntpct(void)
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{
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/*
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* AArch64 kernel and user space mandate the use of CNTVCT.
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*/
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BUG();
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return 0;
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}
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static inline u64 arch_counter_get_cntvct(void)
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{
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isb();
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return arch_timer_reg_read_stable(cntvct_el0);
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}
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static inline int arch_timer_arch_init(void)
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{
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return 0;
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}
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#endif
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