LXR linux/include/clocksource/arm_arch

   1/*
   2 * Copyright (C) 2012 ARM Ltd.
   3 *
   4 * This program is free software; you can redistribute it and/or modify
   5 * it under the terms of the GNU General Public License version 2 as
   6 * published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful,
   9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 * GNU General Public License for more details.
  12 *
  13 * You should have received a copy of the GNU General Public License
  14 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15 */
  16#ifndef __CLKSOURCE_ARM_ARCH_TIMER_H
  17#define __CLKSOURCE_ARM_ARCH_TIMER_H
  18
  19#include <linux/bitops.h>
  20#include <linux/timecounter.h>
  21#include <linux/types.h>
  22
  23#define ARCH_TIMER_TYPE_CP15            BIT(0)
  24#define ARCH_TIMER_TYPE_MEM             BIT(1)
  25
  26#define ARCH_TIMER_CTRL_ENABLE          (1 << 0)
  27#define ARCH_TIMER_CTRL_IT_MASK         (1 << 1)
  28#define ARCH_TIMER_CTRL_IT_STAT         (1 << 2)
  29
  30#define CNTHCTL_EL1PCTEN                (1 << 0)
  31#define CNTHCTL_EL1PCEN                 (1 << 1)
  32#define CNTHCTL_EVNTEN                  (1 << 2)
  33#define CNTHCTL_EVNTDIR                 (1 << 3)
  34#define CNTHCTL_EVNTI                   (0xF << 4)
  35
  36enum arch_timer_reg {
  37        ARCH_TIMER_REG_CTRL,
  38        ARCH_TIMER_REG_TVAL,
  39};
  40
  41enum arch_timer_ppi_nr {
  42        ARCH_TIMER_PHYS_SECURE_PPI,
  43        ARCH_TIMER_PHYS_NONSECURE_PPI,
  44        ARCH_TIMER_VIRT_PPI,
  45        ARCH_TIMER_HYP_PPI,
  46        ARCH_TIMER_MAX_TIMER_PPI
  47};
  48
  49enum arch_timer_spi_nr {
  50        ARCH_TIMER_PHYS_SPI,
  51        ARCH_TIMER_VIRT_SPI,
  52        ARCH_TIMER_MAX_TIMER_SPI
  53};
  54
  55#define ARCH_TIMER_PHYS_ACCESS          0
  56#define ARCH_TIMER_VIRT_ACCESS          1
  57#define ARCH_TIMER_MEM_PHYS_ACCESS      2
  58#define ARCH_TIMER_MEM_VIRT_ACCESS      3
  59
  60#define ARCH_TIMER_MEM_MAX_FRAMES       8
  61
  62#define ARCH_TIMER_USR_PCT_ACCESS_EN    (1 << 0) /* physical counter */
  63#define ARCH_TIMER_USR_VCT_ACCESS_EN    (1 << 1) /* virtual counter */
  64#define ARCH_TIMER_VIRT_EVT_EN          (1 << 2)
  65#define ARCH_TIMER_EVT_TRIGGER_SHIFT    (4)
  66#define ARCH_TIMER_EVT_TRIGGER_MASK     (0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
  67#define ARCH_TIMER_USR_VT_ACCESS_EN     (1 << 8) /* virtual timer registers */
  68#define ARCH_TIMER_USR_PT_ACCESS_EN     (1 << 9) /* physical timer registers */
  69
  70#define ARCH_TIMER_EVT_STREAM_FREQ      10000   /* 100us */
  71
  72struct arch_timer_kvm_info {
  73        struct timecounter timecounter;
  74        int virtual_irq;
  75};
  76
  77struct arch_timer_mem_frame {
  78        bool valid;
  79        phys_addr_t cntbase;
  80        size_t size;
  81        int phys_irq;
  82        int virt_irq;
  83};
  84
  85struct arch_timer_mem {
  86        phys_addr_t cntctlbase;
  87        size_t size;
  88        struct arch_timer_mem_frame frame[ARCH_TIMER_MEM_MAX_FRAMES];
  89};
  90
  91#ifdef CONFIG_ARM_ARCH_TIMER
  92
  93extern u32 arch_timer_get_rate(void);
  94extern u64 (*arch_timer_read_counter)(void);
  95extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void);
  96
  97#else
  98
  99static inline u32 arch_timer_get_rate(void)
 100{
 101        return 0;
 102}
 103
 104static inline u64 arch_timer_read_counter(void)
 105{
 106        return 0;
 107}
 108
 109#endif
 110
 111#endif
 112