include/clocksource/arm_arch_timer.h

   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/timecounter.h>
  20 #include <linux/types.h>
  21
  22 #define ARCH_TIMER_CTRL_ENABLE          (1 << 0)
  23 #define ARCH_TIMER_CTRL_IT_MASK         (1 << 1)
  24 #define ARCH_TIMER_CTRL_IT_STAT         (1 << 2)
  25
  26 #define CNTHCTL_EL1PCTEN                (1 << 0)
  27 #define CNTHCTL_EL1PCEN                 (1 << 1)
  28 #define CNTHCTL_EVNTEN                  (1 << 2)
  29 #define CNTHCTL_EVNTDIR                 (1 << 3)
  30 #define CNTHCTL_EVNTI                   (0xF << 4)
  31
  32 enum arch_timer_reg {
  33         ARCH_TIMER_REG_CTRL,
  34         ARCH_TIMER_REG_TVAL,
  35 };
  36
  37 #define ARCH_TIMER_PHYS_ACCESS          0
  38 #define ARCH_TIMER_VIRT_ACCESS          1
  39 #define ARCH_TIMER_MEM_PHYS_ACCESS      2
  40 #define ARCH_TIMER_MEM_VIRT_ACCESS      3
  41
  42 #define ARCH_TIMER_USR_PCT_ACCESS_EN    (1 << 0) /* physical counter */
  43 #define ARCH_TIMER_USR_VCT_ACCESS_EN    (1 << 1) /* virtual counter */
  44 #define ARCH_TIMER_VIRT_EVT_EN          (1 << 2)
  45 #define ARCH_TIMER_EVT_TRIGGER_SHIFT    (4)
  46 #define ARCH_TIMER_EVT_TRIGGER_MASK     (0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
  47 #define ARCH_TIMER_USR_VT_ACCESS_EN     (1 << 8) /* virtual timer registers */
  48 #define ARCH_TIMER_USR_PT_ACCESS_EN     (1 << 9) /* physical timer registers */
  49
  50 #define ARCH_TIMER_EVT_STREAM_FREQ      10000   /* 100us */
  51
  52 #ifdef CONFIG_ARM_ARCH_TIMER
  53
  54 extern u32 arch_timer_get_rate(void);
  55 extern u64 (*arch_timer_read_counter)(void);
  56 extern struct timecounter *arch_timer_get_timecounter(void);
  57
  58 #else
  59
  60 static inline u32 arch_timer_get_rate(void)
  61 {
  62         return 0;
  63 }
  64
  65 static inline u64 arch_timer_read_counter(void)
  66 {
  67         return 0;
  68 }
  69
  70 static inline struct timecounter *arch_timer_get_timecounter(void)
  71 {
  72         return NULL;
  73 }
  74
  75 #endif
  76
  77 #endif