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 36 enum arch_timer_reg { 37 ARCH_TIMER_REG_CTRL, 38 ARCH_TIMER_REG_TVAL, 39 }; 40 41 enum 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 49 enum 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_PERIOD_US 100 71 #define ARCH_TIMER_EVT_STREAM_FREQ \ 72 (USEC_PER_SEC / ARCH_TIMER_EVT_STREAM_PERIOD_US) 73 74 struct arch_timer_kvm_info { 75 struct timecounter timecounter; 76 int virtual_irq; 77 }; 78 79 struct arch_timer_mem_frame { 80 bool valid; 81 phys_addr_t cntbase; 82 size_t size; 83 int phys_irq; 84 int virt_irq; 85 }; 86 87 struct arch_timer_mem { 88 phys_addr_t cntctlbase; 89 size_t size; 90 struct arch_timer_mem_frame frame[ARCH_TIMER_MEM_MAX_FRAMES]; 91 }; 92 93 #ifdef CONFIG_ARM_ARCH_TIMER 94 95 extern u32 arch_timer_get_rate(void); 96 extern u64 (*arch_timer_read_counter)(void); 97 extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void); 98 extern bool arch_timer_evtstrm_available(void); 99 100 #else 101 102 static inline u32 arch_timer_get_rate(void) 103 { 104 return 0; 105 } 106 107 static inline u64 arch_timer_read_counter(void) 108 { 109 return 0; 110 } 111 112 static inline bool arch_timer_evtstrm_available(void) 113 { 114 return false; 115 } 116 117 #endif 118 119 #endif 120