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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-20 14:29:37 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-20 14:29:37 -0800
commit6db167dfc013b0e114c81077ac091ba26a69f4ed (patch)
tree1978b8a2774e0fdb3690065625b0b5eb84475552 /Documentation/devicetree
parent32f9aab8ebd886211a7b3e552753af014c3e5225 (diff)
parent9cb543124a2d31af42ce61a4c30765ecc8e5f1fa (diff)
Merge branch 'for-linus-2' of git://git.linaro.org/people/rmk/linux-arm
Pull ARM updates (part two) from Russell King: - breakpoint and perf updates from Will Deacon. - hypervisor boot mode updates from Will. - support for Power State Coordination Interface via the Hypervisor - core ARM support for KVM * 'for-linus-2' of git://git.linaro.org/people/rmk/linux-arm: (32 commits) KVM: ARM: Add maintainer entry for KVM/ARM KVM: ARM: Power State Coordination Interface implementation KVM: ARM: Handle I/O aborts KVM: ARM: Handle guest faults in KVM KVM: ARM: VFP userspace interface KVM: ARM: Demux CCSIDR in the userspace API KVM: ARM: User space API for getting/setting co-proc registers KVM: ARM: Emulation framework and CP15 emulation KVM: ARM: World-switch implementation KVM: ARM: Inject IRQs and FIQs from userspace KVM: ARM: Memory virtualization setup KVM: ARM: Hypervisor initialization KVM: ARM: Initial skeleton to compile KVM support ARM: Section based HYP idmap ARM: Add page table and page defines needed by KVM ARM: perf: simplify __hw_perf_event_init err handling ARM: perf: remove unnecessary checks for idx < 0 ARM: perf: handle armpmu_register failing ARM: perf: don't pretend to support counting of L1I writes ARM: perf: remove redundant NULL check on cpu_pmu ...
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+* Power State Coordination Interface (PSCI)
+
+Firmware implementing the PSCI functions described in ARM document number
+ARM DEN 0022A ("Power State Coordination Interface System Software on ARM
+processors") can be used by Linux to initiate various CPU-centric power
+operations.
+
+Issue A of the specification describes functions for CPU suspend, hotplug
+and migration of secure software.
+
+Functions are invoked by trapping to the privilege level of the PSCI
+firmware (specified as part of the binding below) and passing arguments
+in a manner similar to that specified by AAPCS:
+
+ r0 => 32-bit Function ID / return value
+ {r1 - r3} => Parameters
+
+Note that the immediate field of the trapping instruction must be set
+to #0.
+
+
+Main node required properties:
+
+ - compatible : Must be "arm,psci"
+
+ - method : The method of calling the PSCI firmware. Permitted
+ values are:
+
+ "smc" : SMC #0, with the register assignments specified
+ in this binding.
+
+ "hvc" : HVC #0, with the register assignments specified
+ in this binding.
+
+Main node optional properties:
+
+ - cpu_suspend : Function ID for CPU_SUSPEND operation
+
+ - cpu_off : Function ID for CPU_OFF operation
+
+ - cpu_on : Function ID for CPU_ON operation
+
+ - migrate : Function ID for MIGRATE operation
+
+
+Example:
+
+ psci {
+ compatible = "arm,psci";
+ method = "smc";
+ cpu_suspend = <0x95c10000>;
+ cpu_off = <0x95c10001>;
+ cpu_on = <0x95c10002>;
+ migrate = <0x95c10003>;
+ };