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-rw-r--r--common/psci/psci_afflvl_off.c274
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diff --git a/common/psci/psci_afflvl_off.c b/common/psci/psci_afflvl_off.c
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--- a/common/psci/psci_afflvl_off.c
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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 <stdio.h>
-#include <string.h>
-#include <assert.h>
-#include <arch_helpers.h>
-#include <console.h>
-#include <platform.h>
-#include <psci.h>
-#include <psci_private.h>
-
-typedef int (*afflvl_off_handler)(unsigned long, aff_map_node *);
-
-/*******************************************************************************
- * 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(unsigned long mpidr, aff_map_node *cpu_node)
-{
- unsigned int index, plat_state;
- int rc = PSCI_E_SUCCESS;
- unsigned long sctlr = read_sctlr();
-
- assert(cpu_node->level == MPIDR_AFFLVL0);
-
- /* State management: mark this cpu as turned off */
- psci_set_state(cpu_node, PSCI_STATE_OFF);
-
- /*
- * Generic management: Get the index for clearing any
- * lingering re-entry information
- */
- index = cpu_node->data;
- memset(&psci_ns_entry_info[index], 0, sizeof(psci_ns_entry_info[index]));
-
- /*
- * Arch. management. Perform the necessary steps to flush all
- * cpu caches.
- *
- * TODO: This power down sequence varies across cpus so it needs to be
- * abstracted out on the basis of the MIDR like in cpu_reset_handler().
- * Do the bare minimal for the time being. Fix this before porting to
- * Cortex models.
- */
- sctlr &= ~SCTLR_C_BIT;
- write_sctlr(sctlr);
-
- /*
- * CAUTION: This flush to the level of unification makes an assumption
- * about the cache hierarchy at affinity level 0 (cpu) in the platform.
- * Ideally the platform should tell psci which levels to flush to exit
- * coherency.
- */
- dcsw_op_louis(DCCISW);
-
- /*
- * Plat. management: Perform platform specific actions to turn this
- * cpu off e.g. exit cpu coherency, program the power controller etc.
- */
- if (psci_plat_pm_ops->affinst_off) {
-
- /* Get the current physical state of this cpu */
- plat_state = psci_get_phys_state(cpu_node);
- rc = psci_plat_pm_ops->affinst_off(mpidr,
- cpu_node->level,
- plat_state);
- }
-
- return rc;
-}
-
-static int psci_afflvl1_off(unsigned long mpidr, aff_map_node *cluster_node)
-{
- int rc = PSCI_E_SUCCESS;
- unsigned int plat_state;
-
- /* Sanity check the cluster level */
- assert(cluster_node->level == MPIDR_AFFLVL1);
-
- /* State management: Decrement the cluster reference count */
- psci_set_state(cluster_node, PSCI_STATE_OFF);
-
- /*
- * Keep the physical state of this cluster handy to decide
- * what action needs to be taken
- */
- plat_state = psci_get_phys_state(cluster_node);
-
- /*
- * Arch. Management. Flush all levels of caches to PoC if
- * the cluster is to be shutdown
- */
- if (plat_state == PSCI_STATE_OFF)
- dcsw_op_all(DCCISW);
-
- /*
- * Plat. Management. Allow the platform to do its cluster
- * specific bookeeping e.g. turn off interconnect coherency,
- * program the power controller etc.
- */
- if (psci_plat_pm_ops->affinst_off)
- rc = psci_plat_pm_ops->affinst_off(mpidr,
- cluster_node->level,
- plat_state);
-
- return rc;
-}
-
-static int psci_afflvl2_off(unsigned long mpidr, aff_map_node *system_node)
-{
- int rc = PSCI_E_SUCCESS;
- unsigned int plat_state;
-
- /* Cannot go beyond this level */
- assert(system_node->level == MPIDR_AFFLVL2);
-
- /* State management: Decrement the system reference count */
- psci_set_state(system_node, PSCI_STATE_OFF);
-
- /*
- * Keep the physical state of the system handy to decide what
- * action needs to be taken
- */
- plat_state = psci_get_phys_state(system_node);
-
- /* No arch. and generic bookeeping to do here currently */
-
- /*
- * Plat. Management : Allow the platform to do its bookeeping
- * at this affinity level
- */
- if (psci_plat_pm_ops->affinst_off)
- rc = psci_plat_pm_ops->affinst_off(mpidr,
- system_node->level,
- plat_state);
- return rc;
-}
-
-static const afflvl_off_handler 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(mpidr_aff_map_nodes mpidr_nodes,
- int start_afflvl,
- int end_afflvl,
- unsigned long mpidr)
-{
- int rc = PSCI_E_INVALID_PARAMS, level;
- aff_map_node *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](mpidr, 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.
- *
- * CAUTION: This function is called with coherent stacks so that coherency can
- * be turned off and caches can be flushed safely.
- ******************************************************************************/
-int psci_afflvl_off(unsigned long mpidr,
- int start_afflvl,
- int end_afflvl)
-{
- int rc = PSCI_E_SUCCESS;
- mpidr_aff_map_nodes mpidr_nodes;
-
- mpidr &= MPIDR_AFFINITY_MASK;;
-
- /*
- * 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(mpidr,
- 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(mpidr,
- start_afflvl,
- end_afflvl,
- mpidr_nodes);
-
- /* Perform generic, architecture and platform specific handling */
- rc = psci_call_off_handlers(mpidr_nodes,
- start_afflvl,
- end_afflvl,
- mpidr);
-
- /*
- * Release the locks corresponding to each affinity level in the
- * reverse order to which they were acquired.
- */
- psci_release_afflvl_locks(mpidr,
- start_afflvl,
- end_afflvl,
- mpidr_nodes);
-
- return rc;
-}