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Linux/arch/arm/include/asm/arch_timer.h

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  1 #ifndef __ASMARM_ARCH_TIMER_H
  2 #define __ASMARM_ARCH_TIMER_H
  3 
  4 #include <asm/barrier.h>
  5 #include <asm/errno.h>
  6 #include <linux/clocksource.h>
  7 #include <linux/init.h>
  8 #include <linux/types.h>
  9 
 10 #include <clocksource/arm_arch_timer.h>
 11 
 12 #ifdef CONFIG_ARM_ARCH_TIMER
 13 int arch_timer_arch_init(void);
 14 
 15 /*
 16  * These register accessors are marked inline so the compiler can
 17  * nicely work out which register we want, and chuck away the rest of
 18  * the code. At least it does so with a recent GCC (4.6.3).
 19  */
 20 static __always_inline
 21 void arch_timer_reg_write_cp15(int access, enum arch_timer_reg reg, u32 val)
 22 {
 23         if (access == ARCH_TIMER_PHYS_ACCESS) {
 24                 switch (reg) {
 25                 case ARCH_TIMER_REG_CTRL:
 26                         asm volatile("mcr p15, 0, %0, c14, c2, 1" : : "r" (val));
 27                         break;
 28                 case ARCH_TIMER_REG_TVAL:
 29                         asm volatile("mcr p15, 0, %0, c14, c2, 0" : : "r" (val));
 30                         break;
 31                 }
 32         } else if (access == ARCH_TIMER_VIRT_ACCESS) {
 33                 switch (reg) {
 34                 case ARCH_TIMER_REG_CTRL:
 35                         asm volatile("mcr p15, 0, %0, c14, c3, 1" : : "r" (val));
 36                         break;
 37                 case ARCH_TIMER_REG_TVAL:
 38                         asm volatile("mcr p15, 0, %0, c14, c3, 0" : : "r" (val));
 39                         break;
 40                 }
 41         }
 42 
 43         isb();
 44 }
 45 
 46 static __always_inline
 47 u32 arch_timer_reg_read_cp15(int access, enum arch_timer_reg reg)
 48 {
 49         u32 val = 0;
 50 
 51         if (access == ARCH_TIMER_PHYS_ACCESS) {
 52                 switch (reg) {
 53                 case ARCH_TIMER_REG_CTRL:
 54                         asm volatile("mrc p15, 0, %0, c14, c2, 1" : "=r" (val));
 55                         break;
 56                 case ARCH_TIMER_REG_TVAL:
 57                         asm volatile("mrc p15, 0, %0, c14, c2, 0" : "=r" (val));
 58                         break;
 59                 }
 60         } else if (access == ARCH_TIMER_VIRT_ACCESS) {
 61                 switch (reg) {
 62                 case ARCH_TIMER_REG_CTRL:
 63                         asm volatile("mrc p15, 0, %0, c14, c3, 1" : "=r" (val));
 64                         break;
 65                 case ARCH_TIMER_REG_TVAL:
 66                         asm volatile("mrc p15, 0, %0, c14, c3, 0" : "=r" (val));
 67                         break;
 68                 }
 69         }
 70 
 71         return val;
 72 }
 73 
 74 static inline u32 arch_timer_get_cntfrq(void)
 75 {
 76         u32 val;
 77         asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (val));
 78         return val;
 79 }
 80 
 81 static inline u64 arch_counter_get_cntvct(void)
 82 {
 83         u64 cval;
 84 
 85         isb();
 86         asm volatile("mrrc p15, 1, %Q0, %R0, c14" : "=r" (cval));
 87         return cval;
 88 }
 89 
 90 static inline u32 arch_timer_get_cntkctl(void)
 91 {
 92         u32 cntkctl;
 93         asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl));
 94         return cntkctl;
 95 }
 96 
 97 static inline void arch_timer_set_cntkctl(u32 cntkctl)
 98 {
 99         asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
100 }
101 
102 static inline void arch_counter_set_user_access(void)
103 {
104         u32 cntkctl = arch_timer_get_cntkctl();
105 
106         /* Disable user access to both physical/virtual counters/timers */
107         /* Also disable virtual event stream */
108         cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
109                         | ARCH_TIMER_USR_VT_ACCESS_EN
110                         | ARCH_TIMER_VIRT_EVT_EN
111                         | ARCH_TIMER_USR_VCT_ACCESS_EN
112                         | ARCH_TIMER_USR_PCT_ACCESS_EN);
113         arch_timer_set_cntkctl(cntkctl);
114 }
115 
116 static inline void arch_timer_evtstrm_enable(int divider)
117 {
118         u32 cntkctl = arch_timer_get_cntkctl();
119         cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
120         /* Set the divider and enable virtual event stream */
121         cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
122                         | ARCH_TIMER_VIRT_EVT_EN;
123         arch_timer_set_cntkctl(cntkctl);
124         elf_hwcap |= HWCAP_EVTSTRM;
125 }
126 
127 #endif
128 
129 #endif
130 

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