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b4d6ce9776
Introduce a structure which are filled up by the arch timer driver and used by the virtual timer in KVM. The first member of this structure will be the timecounter. More members will be added later. A stub for the new helper isn't introduced because KVM requires the arch timer for both ARM64 and ARM32. The function arch_timer_get_timecounter is kept for the time being and will be dropped in a subsequent patch. Signed-off-by: Julien Grall <julien.grall@arm.com> Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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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 __CLKSOURCE_ARM_ARCH_TIMER_H
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#define __CLKSOURCE_ARM_ARCH_TIMER_H
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#include <linux/timecounter.h>
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#include <linux/types.h>
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#define ARCH_TIMER_CTRL_ENABLE (1 << 0)
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#define ARCH_TIMER_CTRL_IT_MASK (1 << 1)
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#define ARCH_TIMER_CTRL_IT_STAT (1 << 2)
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#define CNTHCTL_EL1PCTEN (1 << 0)
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#define CNTHCTL_EL1PCEN (1 << 1)
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#define CNTHCTL_EVNTEN (1 << 2)
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#define CNTHCTL_EVNTDIR (1 << 3)
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#define CNTHCTL_EVNTI (0xF << 4)
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enum arch_timer_reg {
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ARCH_TIMER_REG_CTRL,
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ARCH_TIMER_REG_TVAL,
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};
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#define ARCH_TIMER_PHYS_ACCESS 0
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#define ARCH_TIMER_VIRT_ACCESS 1
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#define ARCH_TIMER_MEM_PHYS_ACCESS 2
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#define ARCH_TIMER_MEM_VIRT_ACCESS 3
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#define ARCH_TIMER_USR_PCT_ACCESS_EN (1 << 0) /* physical counter */
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#define ARCH_TIMER_USR_VCT_ACCESS_EN (1 << 1) /* virtual counter */
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#define ARCH_TIMER_VIRT_EVT_EN (1 << 2)
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#define ARCH_TIMER_EVT_TRIGGER_SHIFT (4)
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#define ARCH_TIMER_EVT_TRIGGER_MASK (0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
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#define ARCH_TIMER_USR_VT_ACCESS_EN (1 << 8) /* virtual timer registers */
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#define ARCH_TIMER_USR_PT_ACCESS_EN (1 << 9) /* physical timer registers */
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#define ARCH_TIMER_EVT_STREAM_FREQ 10000 /* 100us */
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struct arch_timer_kvm_info {
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struct timecounter timecounter;
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};
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#ifdef CONFIG_ARM_ARCH_TIMER
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extern u32 arch_timer_get_rate(void);
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extern u64 (*arch_timer_read_counter)(void);
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extern struct timecounter *arch_timer_get_timecounter(void);
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extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void);
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#else
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static inline u32 arch_timer_get_rate(void)
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{
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return 0;
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}
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static inline u64 arch_timer_read_counter(void)
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{
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return 0;
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}
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static inline struct timecounter *arch_timer_get_timecounter(void)
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{
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return NULL;
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}
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#endif
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#endif
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