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 enum arch_timer_reg {
  27         ARCH_TIMER_REG_CTRL,
  28         ARCH_TIMER_REG_TVAL,
  29 };
  30
  31 #define ARCH_TIMER_PHYS_ACCESS          0
  32 #define ARCH_TIMER_VIRT_ACCESS          1
  33 #define ARCH_TIMER_MEM_PHYS_ACCESS      2
  34 #define ARCH_TIMER_MEM_VIRT_ACCESS      3
  35
  36 #define ARCH_TIMER_USR_PCT_ACCESS_EN    (1 << 0) /* physical counter */
  37 #define ARCH_TIMER_USR_VCT_ACCESS_EN    (1 << 1) /* virtual counter */
  38 #define ARCH_TIMER_VIRT_EVT_EN          (1 << 2)
  39 #define ARCH_TIMER_EVT_TRIGGER_SHIFT    (4)
  40 #define ARCH_TIMER_EVT_TRIGGER_MASK     (0xF << ARCH_TIMER_EVT_TRIGGER_SHIFT)
  41 #define ARCH_TIMER_USR_VT_ACCESS_EN     (1 << 8) /* virtual timer registers */
  42 #define ARCH_TIMER_USR_PT_ACCESS_EN     (1 << 9) /* physical timer registers */
  43
  44 #define ARCH_TIMER_EVT_STREAM_FREQ      10000   /* 100us */
  45
  46 #ifdef CONFIG_ARM_ARCH_TIMER
  47
  48 extern u32 arch_timer_get_rate(void);
  49 extern u64 (*arch_timer_read_counter)(void);
  50 extern struct timecounter *arch_timer_get_timecounter(void);
  51
  52 #else
  53
  54 static inline u32 arch_timer_get_rate(void)
  55 {
  56         return 0;
  57 }
  58
  59 static inline u64 arch_timer_read_counter(void)
  60 {
  61         return 0;
  62 }
  63
  64 static inline struct timecounter *arch_timer_get_timecounter(void)
  65 {
  66         return NULL;
  67 }
  68
  69 #endif
  70
  71 #endif