mirror of https://gitee.com/openkylin/linux.git
255 lines
8.1 KiB
C
255 lines
8.1 KiB
C
/*
|
|
* arch/arm/include/asm/mcpm.h
|
|
*
|
|
* Created by: Nicolas Pitre, April 2012
|
|
* Copyright: (C) 2012-2013 Linaro Limited
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#ifndef MCPM_H
|
|
#define MCPM_H
|
|
|
|
/*
|
|
* Maximum number of possible clusters / CPUs per cluster.
|
|
*
|
|
* This should be sufficient for quite a while, while keeping the
|
|
* (assembly) code simpler. When this starts to grow then we'll have
|
|
* to consider dynamic allocation.
|
|
*/
|
|
#define MAX_CPUS_PER_CLUSTER 4
|
|
#define MAX_NR_CLUSTERS 2
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
/*
|
|
* Platform specific code should use this symbol to set up secondary
|
|
* entry location for processors to use when released from reset.
|
|
*/
|
|
extern void mcpm_entry_point(void);
|
|
|
|
/*
|
|
* This is used to indicate where the given CPU from given cluster should
|
|
* branch once it is ready to re-enter the kernel using ptr, or NULL if it
|
|
* should be gated. A gated CPU is held in a WFE loop until its vector
|
|
* becomes non NULL.
|
|
*/
|
|
void mcpm_set_entry_vector(unsigned cpu, unsigned cluster, void *ptr);
|
|
|
|
/*
|
|
* This sets an early poke i.e a value to be poked into some address
|
|
* from very early assembly code before the CPU is ungated. The
|
|
* address must be physical, and if 0 then nothing will happen.
|
|
*/
|
|
void mcpm_set_early_poke(unsigned cpu, unsigned cluster,
|
|
unsigned long poke_phys_addr, unsigned long poke_val);
|
|
|
|
/*
|
|
* CPU/cluster power operations API for higher subsystems to use.
|
|
*/
|
|
|
|
/**
|
|
* mcpm_cpu_power_up - make given CPU in given cluster runable
|
|
*
|
|
* @cpu: CPU number within given cluster
|
|
* @cluster: cluster number for the CPU
|
|
*
|
|
* The identified CPU is brought out of reset. If the cluster was powered
|
|
* down then it is brought up as well, taking care not to let the other CPUs
|
|
* in the cluster run, and ensuring appropriate cluster setup.
|
|
*
|
|
* Caller must ensure the appropriate entry vector is initialized with
|
|
* mcpm_set_entry_vector() prior to calling this.
|
|
*
|
|
* This must be called in a sleepable context. However, the implementation
|
|
* is strongly encouraged to return early and let the operation happen
|
|
* asynchronously, especially when significant delays are expected.
|
|
*
|
|
* If the operation cannot be performed then an error code is returned.
|
|
*/
|
|
int mcpm_cpu_power_up(unsigned int cpu, unsigned int cluster);
|
|
|
|
/**
|
|
* mcpm_cpu_power_down - power the calling CPU down
|
|
*
|
|
* The calling CPU is powered down.
|
|
*
|
|
* If this CPU is found to be the "last man standing" in the cluster
|
|
* then the cluster is prepared for power-down too.
|
|
*
|
|
* This must be called with interrupts disabled.
|
|
*
|
|
* On success this does not return. Re-entry in the kernel is expected
|
|
* via mcpm_entry_point.
|
|
*
|
|
* This will return if mcpm_platform_register() has not been called
|
|
* previously in which case the caller should take appropriate action.
|
|
*
|
|
* On success, the CPU is not guaranteed to be truly halted until
|
|
* mcpm_cpu_power_down_finish() subsequently returns non-zero for the
|
|
* specified cpu. Until then, other CPUs should make sure they do not
|
|
* trash memory the target CPU might be executing/accessing.
|
|
*/
|
|
void mcpm_cpu_power_down(void);
|
|
|
|
/**
|
|
* mcpm_cpu_power_down_finish - wait for a specified CPU to halt, and
|
|
* make sure it is powered off
|
|
*
|
|
* @cpu: CPU number within given cluster
|
|
* @cluster: cluster number for the CPU
|
|
*
|
|
* Call this function to ensure that a pending powerdown has taken
|
|
* effect and the CPU is safely parked before performing non-mcpm
|
|
* operations that may affect the CPU (such as kexec trashing the
|
|
* kernel text).
|
|
*
|
|
* It is *not* necessary to call this function if you only need to
|
|
* serialise a pending powerdown with mcpm_cpu_power_up() or a wakeup
|
|
* event.
|
|
*
|
|
* Do not call this function unless the specified CPU has already
|
|
* called mcpm_cpu_power_down() or has committed to doing so.
|
|
*
|
|
* @return:
|
|
* - zero if the CPU is in a safely parked state
|
|
* - nonzero otherwise (e.g., timeout)
|
|
*/
|
|
int mcpm_cpu_power_down_finish(unsigned int cpu, unsigned int cluster);
|
|
|
|
/**
|
|
* mcpm_cpu_suspend - bring the calling CPU in a suspended state
|
|
*
|
|
* @expected_residency: duration in microseconds the CPU is expected
|
|
* to remain suspended, or 0 if unknown/infinity.
|
|
*
|
|
* The calling CPU is suspended. The expected residency argument is used
|
|
* as a hint by the platform specific backend to implement the appropriate
|
|
* sleep state level according to the knowledge it has on wake-up latency
|
|
* for the given hardware.
|
|
*
|
|
* If this CPU is found to be the "last man standing" in the cluster
|
|
* then the cluster may be prepared for power-down too, if the expected
|
|
* residency makes it worthwhile.
|
|
*
|
|
* This must be called with interrupts disabled.
|
|
*
|
|
* On success this does not return. Re-entry in the kernel is expected
|
|
* via mcpm_entry_point.
|
|
*
|
|
* This will return if mcpm_platform_register() has not been called
|
|
* previously in which case the caller should take appropriate action.
|
|
*/
|
|
void mcpm_cpu_suspend(u64 expected_residency);
|
|
|
|
/**
|
|
* mcpm_cpu_powered_up - housekeeping workafter a CPU has been powered up
|
|
*
|
|
* This lets the platform specific backend code perform needed housekeeping
|
|
* work. This must be called by the newly activated CPU as soon as it is
|
|
* fully operational in kernel space, before it enables interrupts.
|
|
*
|
|
* If the operation cannot be performed then an error code is returned.
|
|
*/
|
|
int mcpm_cpu_powered_up(void);
|
|
|
|
/*
|
|
* Platform specific methods used in the implementation of the above API.
|
|
*/
|
|
struct mcpm_platform_ops {
|
|
int (*power_up)(unsigned int cpu, unsigned int cluster);
|
|
void (*power_down)(void);
|
|
int (*power_down_finish)(unsigned int cpu, unsigned int cluster);
|
|
void (*suspend)(u64);
|
|
void (*powered_up)(void);
|
|
};
|
|
|
|
/**
|
|
* mcpm_platform_register - register platform specific power methods
|
|
*
|
|
* @ops: mcpm_platform_ops structure to register
|
|
*
|
|
* An error is returned if the registration has been done previously.
|
|
*/
|
|
int __init mcpm_platform_register(const struct mcpm_platform_ops *ops);
|
|
|
|
/* Synchronisation structures for coordinating safe cluster setup/teardown: */
|
|
|
|
/*
|
|
* When modifying this structure, make sure you update the MCPM_SYNC_ defines
|
|
* to match.
|
|
*/
|
|
struct mcpm_sync_struct {
|
|
/* individual CPU states */
|
|
struct {
|
|
s8 cpu __aligned(__CACHE_WRITEBACK_GRANULE);
|
|
} cpus[MAX_CPUS_PER_CLUSTER];
|
|
|
|
/* cluster state */
|
|
s8 cluster __aligned(__CACHE_WRITEBACK_GRANULE);
|
|
|
|
/* inbound-side state */
|
|
s8 inbound __aligned(__CACHE_WRITEBACK_GRANULE);
|
|
};
|
|
|
|
struct sync_struct {
|
|
struct mcpm_sync_struct clusters[MAX_NR_CLUSTERS];
|
|
};
|
|
|
|
extern unsigned long sync_phys; /* physical address of *mcpm_sync */
|
|
|
|
void __mcpm_cpu_going_down(unsigned int cpu, unsigned int cluster);
|
|
void __mcpm_cpu_down(unsigned int cpu, unsigned int cluster);
|
|
void __mcpm_outbound_leave_critical(unsigned int cluster, int state);
|
|
bool __mcpm_outbound_enter_critical(unsigned int this_cpu, unsigned int cluster);
|
|
int __mcpm_cluster_state(unsigned int cluster);
|
|
|
|
int __init mcpm_sync_init(
|
|
void (*power_up_setup)(unsigned int affinity_level));
|
|
|
|
void __init mcpm_smp_set_ops(void);
|
|
|
|
#else
|
|
|
|
/*
|
|
* asm-offsets.h causes trouble when included in .c files, and cacheflush.h
|
|
* cannot be included in asm files. Let's work around the conflict like this.
|
|
*/
|
|
#include <asm/asm-offsets.h>
|
|
#define __CACHE_WRITEBACK_GRANULE CACHE_WRITEBACK_GRANULE
|
|
|
|
#endif /* ! __ASSEMBLY__ */
|
|
|
|
/* Definitions for mcpm_sync_struct */
|
|
#define CPU_DOWN 0x11
|
|
#define CPU_COMING_UP 0x12
|
|
#define CPU_UP 0x13
|
|
#define CPU_GOING_DOWN 0x14
|
|
|
|
#define CLUSTER_DOWN 0x21
|
|
#define CLUSTER_UP 0x22
|
|
#define CLUSTER_GOING_DOWN 0x23
|
|
|
|
#define INBOUND_NOT_COMING_UP 0x31
|
|
#define INBOUND_COMING_UP 0x32
|
|
|
|
/*
|
|
* Offsets for the mcpm_sync_struct members, for use in asm.
|
|
* We don't want to make them global to the kernel via asm-offsets.c.
|
|
*/
|
|
#define MCPM_SYNC_CLUSTER_CPUS 0
|
|
#define MCPM_SYNC_CPU_SIZE __CACHE_WRITEBACK_GRANULE
|
|
#define MCPM_SYNC_CLUSTER_CLUSTER \
|
|
(MCPM_SYNC_CLUSTER_CPUS + MCPM_SYNC_CPU_SIZE * MAX_CPUS_PER_CLUSTER)
|
|
#define MCPM_SYNC_CLUSTER_INBOUND \
|
|
(MCPM_SYNC_CLUSTER_CLUSTER + __CACHE_WRITEBACK_GRANULE)
|
|
#define MCPM_SYNC_CLUSTER_SIZE \
|
|
(MCPM_SYNC_CLUSTER_INBOUND + __CACHE_WRITEBACK_GRANULE)
|
|
|
|
#endif
|