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clocksource: arch_timer: Enable user access to the physical counter

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A user space application is planned to support feature for
synchronized timestamp among debug packets across peripherals.
As part of the feature, it is responsible for providing physical
timer count value to user space. So Enable user access to the
physical counter in cp15 register.

Change-Id: Idf7f6375713d842925e6f72a4b1fb98a7168726d
Signed-off-by: Se Wang (Patrick) Oh <sewango@codeaurora.org>
This commit is contained in:
Se Wang (Patrick) Oh 2015-05-19 20:14:44 -07:00 • committed by David Keitel
parent e98a81ee60
commit 56e8f397e6
1 changed files with 4 additions and 5 deletions
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9
drivers/clocksource/arm_arch_timer.c
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@ -325,15 +325,14 @@ static void arch_counter_set_user_access(void)
{
u32 cntkctl = arch_timer_get_cntkctl();
/* Disable user access to the timers and the physical counter */
/* Disable user access to the 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_PCT_ACCESS_EN);
| ARCH_TIMER_VIRT_EVT_EN);
/* Enable user access to the virtual counter */
cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;
/* Enable user access to the virtual and physical counters */
cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN | ARCH_TIMER_USR_PCT_ACCESS_EN;
arch_timer_set_cntkctl(cntkctl);
}