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clocksource: arch_timer: make virtual counter access configurable

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Change-Id: Ibdb1fd768b748002b90bfc165612c12c8311f8a2
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Hackmann
2017-09-19 10:55:17 -07:00
committed by Greg Kroah-Hartman
parent e16a20b1b9
commit 8910fa5088
2 changed files with 12 additions and 1 deletions
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drivers/clocksource/Kconfig
+8
View File
@@ -305,6 +305,14 @@ config ARM_ARCH_TIMER_EVTSTREAM
This must be disabled for hardware validation purposes to detect any
hardware anomalies of missing events.
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 FSL_ERRATUM_A008585
bool "Workaround for Freescale/NXP Erratum A-008585"
default y
drivers/clocksource/arm_arch_timer.c
+4 -1
View File
@@ -449,7 +449,10 @@ static void arch_counter_set_user_access(void)
| ARCH_TIMER_USR_PCT_ACCESS_EN);
/* Enable user access to the virtual counter */
cntkctl |= ARCH_TIMER_USR_VCT_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);
}