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/*
* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <arch.h>
#include <arch_helpers.h>
#include <assert.h>
#include <string.h>
#include "psci_private.h"
typedef int (*afflvl_off_handler_t)(aff_map_node_t *);
/*******************************************************************************
* The next three functions implement a handler for each supported affinity
* level which is called when that affinity level is turned off.
******************************************************************************/
static int psci_afflvl0_off(aff_map_node_t *cpu_node)
{
int rc;
assert(cpu_node->level == MPIDR_AFFLVL0);
/*
* Generic management: Get the index for clearing any lingering re-entry
* information and allow the secure world to switch itself off
*/
/*
* Call the cpu off handler registered by the Secure Payload Dispatcher
* to let it do any bookeeping. Assume that the SPD always reports an
* E_DENIED error if SP refuse to power down
*/
if (psci_spd_pm && psci_spd_pm->svc_off) {
rc = psci_spd_pm->svc_off(0);
if (rc)
return rc;
}
/*
* Arch. management. Perform the necessary steps to flush all
* cpu caches.
*/
psci_do_pwrdown_cache_maintenance(MPIDR_AFFLVL0);
if (!psci_plat_pm_ops->affinst_off)
return PSCI_E_SUCCESS;
/*
* Plat. management: Perform platform specific actions to turn this
* cpu off e.g. exit cpu coherency, program the power controller etc.
*/
return psci_plat_pm_ops->affinst_off(read_mpidr_el1(),
cpu_node->level,
psci_get_phys_state(cpu_node));
}
static int psci_afflvl1_off(aff_map_node_t *cluster_node)
{
/* Sanity check the cluster level */
assert(cluster_node->level == MPIDR_AFFLVL1);
/*
* Arch. Management. Flush all levels of caches to PoC if
* the cluster is to be shutdown.
*/
psci_do_pwrdown_cache_maintenance(MPIDR_AFFLVL1);
if (!psci_plat_pm_ops->affinst_off)
return PSCI_E_SUCCESS;
/*
* Plat. Management. Allow the platform to do its cluster
* specific bookeeping e.g. turn off interconnect coherency,
* program the power controller etc.
*/
return psci_plat_pm_ops->affinst_off(read_mpidr_el1(),
cluster_node->level,
psci_get_phys_state(cluster_node));
}
static int psci_afflvl2_off(aff_map_node_t *system_node)
{
/* Cannot go beyond this level */
assert(system_node->level == MPIDR_AFFLVL2);
/*
* Keep the physical state of the system handy to decide what
* action needs to be taken
*/
/*
* Arch. Management. Flush all levels of caches to PoC if
* the system is to be shutdown.
*/
psci_do_pwrdown_cache_maintenance(MPIDR_AFFLVL2);
if (!psci_plat_pm_ops->affinst_off)
return PSCI_E_SUCCESS;
/*
* Plat. Management : Allow the platform to do its bookeeping
* at this affinity level
*/
return psci_plat_pm_ops->affinst_off(read_mpidr_el1(),
system_node->level,
psci_get_phys_state(system_node));
}
static const afflvl_off_handler_t psci_afflvl_off_handlers[] = {
psci_afflvl0_off,
psci_afflvl1_off,
psci_afflvl2_off,
};
/*******************************************************************************
* This function takes an array of pointers to affinity instance nodes in the
* topology tree and calls the off handler for the corresponding affinity
* levels
******************************************************************************/
static int psci_call_off_handlers(aff_map_node_t *mpidr_nodes[],
int start_afflvl,
int end_afflvl)
{
int rc = PSCI_E_INVALID_PARAMS, level;
aff_map_node_t *node;
for (level = start_afflvl; level <= end_afflvl; level++) {
node = mpidr_nodes[level];
if (node == NULL)
continue;
/*
* TODO: In case of an error should there be a way
* of restoring what we might have torn down at
* lower affinity levels.
*/
rc = psci_afflvl_off_handlers[level](node);
if (rc != PSCI_E_SUCCESS)
break;
}
return rc;
}
/*******************************************************************************
* Top level handler which is called when a cpu wants to power itself down.
* It's assumed that along with turning the cpu off, higher affinity levels will
* be turned off as far as possible. It traverses through all the affinity
* levels performing generic, architectural, platform setup and state management
* e.g. for a cluster that's to be powered off, it will call the platform
* specific code which will disable coherency at the interconnect level if the
* cpu is the last in the cluster. For a cpu it could mean programming the power
* the power controller etc.
*
* The state of all the relevant affinity levels is changed prior to calling the
* affinity level specific handlers as their actions would depend upon the state
* the affinity level is about to enter.
*
* The affinity level specific handlers are called in ascending order i.e. from
* the lowest to the highest affinity level implemented by the platform because
* to turn off affinity level X it is neccesary to turn off affinity level X - 1
* first.
******************************************************************************/
int psci_afflvl_off(int start_afflvl,
int end_afflvl)
{
int rc = PSCI_E_SUCCESS;
mpidr_aff_map_nodes_t mpidr_nodes;
unsigned int max_phys_off_afflvl;
/*
* Collect the pointers to the nodes in the topology tree for
* each affinity instance in the mpidr. If this function does
* not return successfully then either the mpidr or the affinity
* levels are incorrect. In either case, we cannot return back
* to the caller as it would not know what to do.
*/
rc = psci_get_aff_map_nodes(read_mpidr_el1() & MPIDR_AFFINITY_MASK,
start_afflvl,
end_afflvl,
mpidr_nodes);
assert (rc == PSCI_E_SUCCESS);
/*
* This function acquires the lock corresponding to each affinity
* level so that by the time all locks are taken, the system topology
* is snapshot and state management can be done safely.
*/
psci_acquire_afflvl_locks(start_afflvl,
end_afflvl,
mpidr_nodes);
/*
* This function updates the state of each affinity instance
* corresponding to the mpidr in the range of affinity levels
* specified.
*/
psci_do_afflvl_state_mgmt(start_afflvl,
end_afflvl,
mpidr_nodes,
PSCI_STATE_OFF);
max_phys_off_afflvl = psci_find_max_phys_off_afflvl(start_afflvl,
end_afflvl,
mpidr_nodes);
assert(max_phys_off_afflvl != PSCI_INVALID_DATA);
/* Stash the highest affinity level that will enter the OFF state. */
psci_set_max_phys_off_afflvl(max_phys_off_afflvl);
/* Perform generic, architecture and platform specific handling */
rc = psci_call_off_handlers(mpidr_nodes,
start_afflvl,
end_afflvl);
/*
* Invalidate the entry for the highest affinity level stashed earlier.
* This ensures that any reads of this variable outside the power
* up/down sequences return PSCI_INVALID_DATA.
*
*/
psci_set_max_phys_off_afflvl(PSCI_INVALID_DATA);
/*
* Release the locks corresponding to each affinity level in the
* reverse order to which they were acquired.
*/
psci_release_afflvl_locks(start_afflvl,
end_afflvl,
mpidr_nodes);
return rc;
}