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/clocksource.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 ARCH_TIMER_REG_CTRL             0
  27 #define ARCH_TIMER_REG_TVAL             1
  28
  29 #define ARCH_TIMER_PHYS_ACCESS          0
  30 #define ARCH_TIMER_VIRT_ACCESS          1
  31
  32 #ifdef CONFIG_ARM_ARCH_TIMER
  33
  34 extern int arch_timer_init(void);
  35 extern u32 arch_timer_get_rate(void);
  36 extern u64 (*arch_timer_read_counter)(void);
  37 extern struct timecounter *arch_timer_get_timecounter(void);
  38
  39 #else
  40
  41 static inline int arch_timer_init(void)
  42 {
  43         return -ENXIO;
  44 }
  45
  46 static inline u32 arch_timer_get_rate(void)
  47 {
  48         return 0;
  49 }
  50
  51 static inline u64 arch_timer_read_counter(void)
  52 {
  53         return 0;
  54 }
  55
  56 static inline struct timecounter *arch_timer_get_timecounter(void)
  57 {
  58         return NULL;
  59 }
  60
  61 #endif
  62
  63 #endif