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_FREQ      10000   /* 100us */
  71
  72 struct arch_timer_kvm_info {
  73         struct timecounter timecounter;
  74         int virtual_irq;
  75 };
  76
  77 struct arch_timer_mem_frame {
  78         bool valid;
  79         phys_addr_t cntbase;
  80         size_t size;
  81         int phys_irq;
  82         int virt_irq;
  83 };
  84
  85 struct arch_timer_mem {
  86         phys_addr_t cntctlbase;
  87         size_t size;
  88         struct arch_timer_mem_frame frame[ARCH_TIMER_MEM_MAX_FRAMES];
  89 };
  90
  91 #ifdef CONFIG_ARM_ARCH_TIMER
  92
  93 extern u32 arch_timer_get_rate(void);
  94 extern u64 (*arch_timer_read_counter)(void);
  95 extern struct arch_timer_kvm_info *arch_timer_get_kvm_info(void);
  96
  97 #else
  98
  99 static inline u32 arch_timer_get_rate(void)
 100 {
 101         return 0;
 102 }
 103
 104 static inline u64 arch_timer_read_counter(void)
 105 {
 106         return 0;
 107 }
 108
 109 #endif
 110
 111 #endif