1 files changed, 31 insertions, 5 deletions

diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h
index 5665134bfa3e..0704e0cf5571 100644
--- a/arch/arm/include/asm/arch_timer.h
+++ b/arch/arm/include/asm/arch_timer.h
@@ -87,17 +87,43 @@ static inline u64 arch_counter_get_cntvct(void)
         return cval;
 }
 
-static inline void arch_counter_set_user_access(void)
+static inline u32 arch_timer_get_cntkctl(void)
 {
         u32 cntkctl;
-
         asm volatile("mrc p15, 0, %0, c14, c1, 0" : "=r" (cntkctl));
+        return cntkctl;
+}
 
-        /* disable user access to everything */
-        cntkctl &= ~((3 << 8) | (7 << 0));
-
+static inline void arch_timer_set_cntkctl(u32 cntkctl)
+{
         asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
 }
+
+static inline void arch_counter_set_user_access(void)
+{
+        u32 cntkctl = arch_timer_get_cntkctl();
+
+        /* Disable user access to both physical/virtual counters/timers */
+        /* Also disable virtual event stream */
+        cntkctl &= ~(ARCH_TIMER_USR_PT_ACCESS_EN
+                        | ARCH_TIMER_USR_VT_ACCESS_EN
+                        | ARCH_TIMER_VIRT_EVT_EN
+                        | ARCH_TIMER_USR_VCT_ACCESS_EN
+                        | ARCH_TIMER_USR_PCT_ACCESS_EN);
+        arch_timer_set_cntkctl(cntkctl);
+}
+
+static inline void arch_timer_evtstrm_enable(int divider)
+{
+        u32 cntkctl = arch_timer_get_cntkctl();
+        cntkctl &= ~ARCH_TIMER_EVT_TRIGGER_MASK;
+        /* Set the divider and enable virtual event stream */
+        cntkctl |= (divider << ARCH_TIMER_EVT_TRIGGER_SHIFT)
+                        | ARCH_TIMER_VIRT_EVT_EN;
+        arch_timer_set_cntkctl(cntkctl);
+        elf_hwcap |= HWCAP_EVTSTRM;
+}
+
 #endif
 
 #endif