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/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