include/clocksource/arm_arch_timer.h

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