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 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 72