1/* SPDX-License-Identifier: GPL-2.0-only */
  2/*
  3 * Copyright (C) 2012 ARM Ltd.
  4 */
  5#ifndef __CLKSOURCE_ARM_ARCH_TIMER_H
  6#define __CLKSOURCE_ARM_ARCH_TIMER_H
  7
  8#include <linux/bitops.h>
  9#include <linux/timecounter.h>
 10#include <linux/types.h>
 11
 12#define ARCH_TIMER_TYPE_CP15		BIT(0)
 13#define ARCH_TIMER_TYPE_MEM		BIT(1)
 14
 15#define ARCH_TIMER_CTRL_ENABLE		(1 << 0)
 16#define ARCH_TIMER_CTRL_IT_MASK		(1 << 1)
 17#define ARCH_TIMER_CTRL_IT_STAT		(1 << 2)
 18
 19#define CNTHCTL_EL1PCTEN		(1 << 0)
 20#define CNTHCTL_EL1PCEN			(1 << 1)
 21#define CNTHCTL_EVNTEN			(1 << 2)
 22#define CNTHCTL_EVNTDIR			(1 << 3)
 23#define CNTHCTL_EVNTI			(0xF << 4)
 24#define CNTHCTL_ECV			(1 << 12)
 25
 26enum arch_timer_reg {
 27	ARCH_TIMER_REG_CTRL,
 28	ARCH_TIMER_REG_CVAL,
 29};
 30
 31enum arch_timer_ppi_nr {
 32	ARCH_TIMER_PHYS_SECURE_PPI,
 33	ARCH_TIMER_PHYS_NONSECURE_PPI,
 34	ARCH_TIMER_VIRT_PPI,
 35	ARCH_TIMER_HYP_PPI,
 36	ARCH_TIMER_HYP_VIRT_PPI,
 37	ARCH_TIMER_MAX_TIMER_PPI
 38};
 39
 40enum arch_timer_spi_nr {
 41	ARCH_TIMER_PHYS_SPI,
 42	ARCH_TIMER_VIRT_SPI,
 43	ARCH_TIMER_MAX_TIMER_SPI
 44};
 45
 46#define ARCH_TIMER_PHYS_ACCESS		0
 47#define ARCH_TIMER_VIRT_ACCESS		1
 48#define ARCH_TIMER_MEM_PHYS_ACCESS	2
 49#define ARCH_TIMER_MEM_VIRT_ACCESS	3
 50
 51#define ARCH_TIMER_MEM_MAX_FRAMES	8
 52
 53#define ARCH_TIMER_USR_PCT_ACCESS_EN	(1 << 0) /* physical counter */
 54#define ARCH_TIMER_USR_VCT_ACCESS_EN	(1 << 1) /* virtual counter */
 55#define ARCH_TIMER_VIRT_EVT_EN		(1 << 2)
 56#define ARCH_TIMER_EVT_TRIGGER_SHIFT	(4)
 57#define ARCH_TIMER_EVT_TRIGGER_MASK	(0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
 58#define ARCH_TIMER_USR_VT_ACCESS_EN	(1 << 8) /* virtual timer registers */
 59#define ARCH_TIMER_USR_PT_ACCESS_EN	(1 << 9) /* physical timer registers */
 60#define ARCH_TIMER_EVT_INTERVAL_SCALE	(1 << 17) /* EVNTIS in the ARMv8 ARM */
 61
 62#define ARCH_TIMER_EVT_STREAM_PERIOD_US	100
 63#define ARCH_TIMER_EVT_STREAM_FREQ				\
 64	(USEC_PER_SEC / ARCH_TIMER_EVT_STREAM_PERIOD_US)
 65
 66struct arch_timer_kvm_info {
 67	struct timecounter timecounter;
 68	int virtual_irq;
 69	int physical_irq;
 70};
 71
 72struct arch_timer_mem_frame {
 73	bool valid;
 74	phys_addr_t cntbase;
 75	size_t size;
 76	int phys_irq;
 77	int virt_irq;
 78};
 79
 80struct arch_timer_mem {
 81	phys_addr_t cntctlbase;
 82	size_t size;
 83	struct arch_timer_mem_frame frame[ARCH_TIMER_MEM_MAX_FRAMES];
 84};
 85
 86#ifdef CONFIG_ARM_ARCH_TIMER
 87
 88extern u32 arch_timer_get_rate(void);
 89extern u64 (*arch_timer_read_counter)(void);
 90extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void);
 91extern bool arch_timer_evtstrm_available(void);
 92
 93#else
 94
 95static inline u32 arch_timer_get_rate(void)
 96{
 97	return 0;
 98}
 99
100static inline u64 arch_timer_read_counter(void)
101{
102	return 0;
103}
104
105static inline bool arch_timer_evtstrm_available(void)
106{
107	return false;
108}
109
110#endif
111
112#endif