Merge branch 'depends/rmk-psci' into next/virt (3ad06d1a) · Commits · 方亚芬 / linux

Documentation/devicetree/bindings/arm/psci.txt

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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>;
		};

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		@@ -1622,6 +1622,16 @@ config HOTPLUG_CPU
		Say Y here to experiment with turning CPUs off and on. CPUs
		can be controlled through /sys/devices/system/cpu.

		config ARM_PSCI
		bool "Support for the ARM Power State Coordination Interface (PSCI)"
		depends on CPU_V7
		help
		Say Y here if you want Linux to communicate with system firmware
		implementing the PSCI specification for CPU-centric power
		management operations described in ARM document number ARM DEN
		0022A ("Power State Coordination Interface System Software on
		ARM processors").

		config LOCAL_TIMERS
		bool "Use local timer interrupts"
		depends on SMP

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		/*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* Copyright (C) 2012 ARM Limited
		*/

		#ifndef __ASM_ARM_OPCODES_SEC_H
		#define __ASM_ARM_OPCODES_SEC_H

		#include <asm/opcodes.h>

		#define __SMC(imm4) __inst_arm_thumb32( \
		0xE1600070 \| (((imm4) & 0xF) << 0), \
		0xF7F08000 \| (((imm4) & 0xF) << 16) \
		)

		#endif /* __ASM_ARM_OPCODES_SEC_H */

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		@@ -10,6 +10,7 @@
		#define __ASM_ARM_OPCODES_H

		#ifndef __ASSEMBLY__
		#include <linux/linkage.h>
		extern asmlinkage unsigned int arm_check_condition(u32 opcode, u32 psr);
		#endif

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		/*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* Copyright (C) 2012 ARM Limited
		*/

		#ifndef __ASM_ARM_PSCI_H
		#define __ASM_ARM_PSCI_H

		#define PSCI_POWER_STATE_TYPE_STANDBY 0
		#define PSCI_POWER_STATE_TYPE_POWER_DOWN 1

		struct psci_power_state {
		u16 id;
		u8 type;
		u8 affinity_level;
		};

		struct psci_operations {
		int (*cpu_suspend)(struct psci_power_state state,
		unsigned long entry_point);
		int (*cpu_off)(struct psci_power_state state);
		int (*cpu_on)(unsigned long cpuid, unsigned long entry_point);
		int (*migrate)(unsigned long cpuid);
		};

		extern struct psci_operations psci_ops;

		#endif /* __ASM_ARM_PSCI_H */