clocksource: arm_arch_timer: Enable counter access for 32-bit ARM

The only difference between arm and arm64's implementations of
arch_counter_set_user_access is that 32-bit ARM does not enable user
access to the virtual counter.  We want to enable this access for the
32-bit ARM VDSO, so copy the arm64 version to the driver itself, and
remove the arch-specific implementations.

Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index e0e7729d37fd..42bd4455daca 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -312,6 +312,23 @@ static void arch_timer_configure_evtstream(void)
         arch_timer_evtstrm_enable(min(pos, 15));
 }
 
+static void arch_counter_set_user_access(void)
+{
+        u32 cntkctl = arch_timer_get_cntkctl();
+
+        /* Disable user access to the timers and the physical counter */
+        /* 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_PCT_ACCESS_EN);
+
+        /* Enable user access to the virtual counter */
+        cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;
+
+        arch_timer_set_cntkctl(cntkctl);
+}
+
 static int arch_timer_setup(struct clock_event_device *clk)
 {
         __arch_timer_setup(ARCH_CP15_TIMER, clk);