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Commit 0d0ffa94 authored by Will Deacon's avatar Will Deacon
Browse files

Merge branch 'for-rmk/virt/psci' into for-arm-soc/virt/mach

parents 9e02e394 2bdd424f

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>;

	};

arch/arm/Kconfig

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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

arch/arm/include/asm/opcodes-sec.h

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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 */

arch/arm/include/asm/opcodes.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

arch/arm/include/asm/psci.h

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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 */