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authorLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2014-02-28 17:03:44 +0400
committerDaniel Lezcano <daniel.lezcano@linaro.org>2014-09-25 12:52:21 +0400
commit3299b63de384159579143d4abdfb94013e0b5470 (patch)
tree8e5e436fbfe85821d35881cb64aa8cdcc391bedc /drivers/cpuidle/Kconfig
parent9f14da345599c14b329cf5ac9499ad322056dd32 (diff)
downloadlinux-3299b63de384159579143d4abdfb94013e0b5470.tar.xz
drivers: cpuidle: CPU idle ARM64 driver
This patch implements a generic CPU idle driver for ARM64 machines. It relies on the DT idle states infrastructure to initialize idle states count and respective parameters. Current code assumes the driver is managing idle states on all possible CPUs but can be easily generalized to support heterogenous systems and build cpumasks at runtime using MIDRs or DT cpu nodes compatible properties. The driver relies on the arm64 CPU operations to call the idle initialization hook used to parse and save suspend back-end specific idle states information upon probing. Idle state index 0 is always initialized as a simple wfi state, ie always considered present and functional on all ARM64 platforms. Idle state indices higher than 0 trigger idle state entry by calling the cpu_suspend function, that triggers the suspend operation through the CPU operations suspend back-end hook. cpu_suspend passes the idle state index as a parameter so that the CPU operations suspend back-end can retrieve the required idle state data by using the idle state index to execute a look-up on its internal data structures. Reviewed-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/cpuidle/Kconfig')
-rw-r--r--drivers/cpuidle/Kconfig5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/cpuidle/Kconfig b/drivers/cpuidle/Kconfig
index 8deb934c6356..c5029c1209b4 100644
--- a/drivers/cpuidle/Kconfig
+++ b/drivers/cpuidle/Kconfig
@@ -33,6 +33,11 @@ depends on ARM
source "drivers/cpuidle/Kconfig.arm"
endmenu
+menu "ARM64 CPU Idle Drivers"
+depends on ARM64
+source "drivers/cpuidle/Kconfig.arm64"
+endmenu
+
menu "MIPS CPU Idle Drivers"
depends on MIPS
source "drivers/cpuidle/Kconfig.mips"