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authorStuart Menefy <stuart.menefy@st.com>2013-06-26 15:48:38 +0400
committerDaniel Lezcano <daniel.lezcano@linaro.org>2013-07-03 19:30:57 +0400
commitc1b40e447af8695666d4c11cfec4a7407e6a124d (patch)
tree813182806167d481396812928fec503b84e39cab /drivers/clocksource/Kconfig
parent0c1dcfd53b1066c411d3885cf8156abf59694360 (diff)
downloadlinux-c1b40e447af8695666d4c11cfec4a7407e6a124d.tar.xz
clocksource: arm_global_timer: Add ARM global timer support
This is a simple driver for the global timer module found in the Cortex A9-MP cores from revision r1p0 onwards. This should be able to perform the functions of the system timer and the local timer in an SMP system. The global timer has the following features: The global timer is a 64-bit incrementing counter with an auto-incrementing feature. It continues incrementing after sending interrupts. The global timer is memory mapped in the private memory region. The global timer is accessible to all Cortex-A9 processors in the cluster. Each Cortex-A9 processor has a private 64-bit comparator that is used to assert a private interrupt when the global timer has reached the comparator value. All the Cortex-A9 processors in a design use the banked ID, ID27, for this interrupt. ID27 is sent to the Interrupt Controller as a Private Peripheral Interrupt. The global timer is clocked by PERIPHCLK. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@st.com> CC: Arnd Bergmann <arnd@arndb.de> CC: Rob Herring <robherring2@gmail.com> CC: Linus Walleij <linus.walleij@linaro.org> CC: Will Deacon <will.deacon@arm.com> CC: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource/Kconfig')
-rw-r--r--drivers/clocksource/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index c082e3e4bd0a..42c8eccb1e86 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -72,6 +72,19 @@ config ARM_ARCH_TIMER
bool
select CLKSRC_OF if OF
+config ARM_GLOBAL_TIMER
+ bool
+ select CLKSRC_OF if OF
+ help
+ This options enables support for the ARM global timer unit
+
+config CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
+ bool
+ depends on ARM_GLOBAL_TIMER
+ default y
+ help
+ Use ARM global timer clock source as sched_clock
+
config CLKSRC_METAG_GENERIC
def_bool y if METAG
help