LXR linux/include/clocksource/arm_arch

   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
  25enum arch_timer_reg {
  26        ARCH_TIMER_REG_CTRL,
  27        ARCH_TIMER_REG_TVAL,
  28};
  29
  30enum arch_timer_ppi_nr {
  31        ARCH_TIMER_PHYS_SECURE_PPI,
  32        ARCH_TIMER_PHYS_NONSECURE_PPI,
  33        ARCH_TIMER_VIRT_PPI,
  34        ARCH_TIMER_HYP_PPI,
  35        ARCH_TIMER_HYP_VIRT_PPI,
  36        ARCH_TIMER_MAX_TIMER_PPI
  37};
  38
  39enum arch_timer_spi_nr {
  40        ARCH_TIMER_PHYS_SPI,
  41        ARCH_TIMER_VIRT_SPI,
  42        ARCH_TIMER_MAX_TIMER_SPI
  43};
  44
  45#define ARCH_TIMER_PHYS_ACCESS          0
  46#define ARCH_TIMER_VIRT_ACCESS          1
  47#define ARCH_TIMER_MEM_PHYS_ACCESS      2
  48#define ARCH_TIMER_MEM_VIRT_ACCESS      3
  49
  50#define ARCH_TIMER_MEM_MAX_FRAMES       8
  51
  52#define ARCH_TIMER_USR_PCT_ACCESS_EN    (1 << 0) /* physical counter */
  53#define ARCH_TIMER_USR_VCT_ACCESS_EN    (1 << 1) /* virtual counter */
  54#define ARCH_TIMER_VIRT_EVT_EN          (1 << 2)
  55#define ARCH_TIMER_EVT_TRIGGER_SHIFT    (4)
  56#define ARCH_TIMER_EVT_TRIGGER_MASK     (0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
  57#define ARCH_TIMER_USR_VT_ACCESS_EN     (1 << 8) /* virtual timer registers */
  58#define ARCH_TIMER_USR_PT_ACCESS_EN     (1 << 9) /* physical timer registers */
  59
  60#define ARCH_TIMER_EVT_STREAM_PERIOD_US 100
  61#define ARCH_TIMER_EVT_STREAM_FREQ                              \
  62        (USEC_PER_SEC / ARCH_TIMER_EVT_STREAM_PERIOD_US)
  63
  64struct arch_timer_kvm_info {
  65        struct timecounter timecounter;
  66        int virtual_irq;
  67        int physical_irq;
  68};
  69
  70struct arch_timer_mem_frame {
  71        bool valid;
  72        phys_addr_t cntbase;
  73        size_t size;
  74        int phys_irq;
  75        int virt_irq;
  76};
  77
  78struct arch_timer_mem {
  79        phys_addr_t cntctlbase;
  80        size_t size;
  81        struct arch_timer_mem_frame frame[ARCH_TIMER_MEM_MAX_FRAMES];
  82};
  83
  84#ifdef CONFIG_ARM_ARCH_TIMER
  85
  86extern u32 arch_timer_get_rate(void);
  87extern u64 (*arch_timer_read_counter)(void);
  88extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void);
  89extern bool arch_timer_evtstrm_available(void);
  90
  91#else
  92
  93static inline u32 arch_timer_get_rate(void)
  94{
  95        return 0;
  96}
  97
  98static inline u64 arch_timer_read_counter(void)
  99{
 100        return 0;
 101}
 102
 103static inline bool arch_timer_evtstrm_available(void)
 104{
 105        return false;
 106}
 107
 108#endif
 109
 110#endif
 111