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clocksource: arch_timer: make virtual counter access configurable

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Change-Id: Ibdb1fd768b748002b90bfc165612c12c8311f8a2
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>
This commit is contained in:
Greg Hackmann 2017-09-19 10:55:17 -07:00 • committed by Neeraj Upadhyay
parent 022df8a55a
commit 3851c63407
2 changed files with 14 additions and 2 deletions
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8
drivers/clocksource/Kconfig
View file

@ -167,6 +167,14 @@ config MSM_TIMER_LEAP
counter rollover. On every counter read if least significant
32 bits are set, reread counter.
config ARM_ARCH_TIMER_VCT_ACCESS
bool "Support for ARM architected timer virtual counter access in userspace"
default !ARM64
depends on ARM_ARCH_TIMER
help
This option enables support for reading the ARM architected timer's
virtual counter in userspace.
config ARM_GLOBAL_TIMER
bool
select CLKSRC_OF if OF

8
drivers/clocksource/arm_arch_timer.c
View file

@ -332,8 +332,12 @@ static void arch_counter_set_user_access(void)
| ARCH_TIMER_VIRT_EVT_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_USR_VT_ACCESS_EN;
cntkctl |= ARCH_TIMER_USR_PCT_ACCESS_EN | ARCH_TIMER_USR_VT_ACCESS_EN;
if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER_VCT_ACCESS))
cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;
else
cntkctl &= ~ARCH_TIMER_USR_VCT_ACCESS_EN;
arch_timer_set_cntkctl(cntkctl);
}