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Commit f5613a0a authored by Greg Hackmann's avatar Greg Hackmann Committed by Greg Kroah-Hartman
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clocksource: arch_timer: make virtual counter access configurable 



Change-Id: Ibdb1fd768b748002b90bfc165612c12c8311f8a2
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
parent e07b57a9

drivers/clocksource/Kconfig

+8 −0
Original line number Original line Diff line number Diff line
@@ -110,6 +110,14 @@ config ARM_ARCH_TIMER_EVTSTREAM 
	  This must be disabled for hardware validation purposes to detect any

	  This must be disabled for hardware validation purposes to detect any

	  hardware anomalies of missing events.

	  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 ARM_GLOBAL_TIMER

config ARM_GLOBAL_TIMER

	bool

	bool

	select CLKSRC_OF if OF

	select CLKSRC_OF if OF

drivers/clocksource/arm_arch_timer.c

+4 −1
Original line number Original line Diff line number Diff line
@@ -339,7 +339,10 @@ static void arch_counter_set_user_access(void) 
			| ARCH_TIMER_USR_PCT_ACCESS_EN);

			| ARCH_TIMER_USR_PCT_ACCESS_EN);





	/* Enable user access to the virtual counter */

	/* Enable user access to the virtual counter */

	if (IS_ENABLED(CONFIG_ARM_ARCH_TIMER_VCT_ACCESS))

		cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;

		cntkctl |= ARCH_TIMER_USR_VCT_ACCESS_EN;

	else

		cntkctl &= ~ARCH_TIMER_USR_VCT_ACCESS_EN;





	arch_timer_set_cntkctl(cntkctl);

	arch_timer_set_cntkctl(cntkctl);

}

}