298 lines
11 KiB
C
298 lines
11 KiB
C
/*
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* Copyright (c) 2013, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <assert.h>
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#include <arch_helpers.h>
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#include <debug.h>
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#include <cci400.h>
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#include <errno.h>
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#include <platform.h>
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#include <platform_def.h>
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#include <psci.h>
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#include "juno_def.h"
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#include "juno_private.h"
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#include "scpi.h"
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/*******************************************************************************
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* Private Juno function to program the mailbox for a cpu before it is released
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* from reset.
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******************************************************************************/
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static void juno_program_mailbox(uint64_t mpidr, uint64_t address)
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{
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uint64_t linear_id;
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uint64_t mbox;
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linear_id = platform_get_core_pos(mpidr);
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mbox = TRUSTED_MAILBOXES_BASE + (linear_id << TRUSTED_MAILBOX_SHIFT);
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*((uint64_t *) mbox) = address;
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flush_dcache_range(mbox, sizeof(mbox));
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}
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/*******************************************************************************
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* Private Juno function which is used to determine if any platform actions
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* should be performed for the specified affinity instance given its
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* state. Nothing needs to be done if the 'state' is not off or if this is not
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* the highest affinity level which will enter the 'state'.
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******************************************************************************/
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static int32_t juno_do_plat_actions(uint32_t afflvl, uint32_t state)
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{
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uint32_t max_phys_off_afflvl;
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assert(afflvl <= MPIDR_AFFLVL1);
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if (state != PSCI_STATE_OFF)
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return -EAGAIN;
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/*
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* Find the highest affinity level which will be suspended and postpone
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* all the platform specific actions until that level is hit.
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*/
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max_phys_off_afflvl = psci_get_max_phys_off_afflvl();
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assert(max_phys_off_afflvl != PSCI_INVALID_DATA);
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assert(psci_get_suspend_afflvl() >= max_phys_off_afflvl);
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if (afflvl != max_phys_off_afflvl)
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return -EAGAIN;
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return 0;
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}
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/*******************************************************************************
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* Juno handler called when an affinity instance is about to be turned on. The
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* level and mpidr determine the affinity instance.
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******************************************************************************/
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int32_t juno_affinst_on(uint64_t mpidr,
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uint64_t sec_entrypoint,
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uint64_t ns_entrypoint,
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uint32_t afflvl,
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uint32_t state)
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{
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/*
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* SCP takes care of powering up higher affinity levels so we
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* only need to care about level 0
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*/
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if (afflvl != MPIDR_AFFLVL0)
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return PSCI_E_SUCCESS;
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/*
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* Setup mailbox with address for CPU entrypoint when it next powers up
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*/
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juno_program_mailbox(mpidr, sec_entrypoint);
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scpi_set_css_power_state(mpidr, scpi_power_on, scpi_power_on,
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scpi_power_on);
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return PSCI_E_SUCCESS;
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}
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/*******************************************************************************
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* Juno handler called when an affinity instance has just been powered on after
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* being turned off earlier. The level and mpidr determine the affinity
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* instance. The 'state' arg. allows the platform to decide whether the cluster
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* was turned off prior to wakeup and do what's necessary to setup it up
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* correctly.
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******************************************************************************/
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int32_t juno_affinst_on_finish(uint64_t mpidr, uint32_t afflvl, uint32_t state)
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{
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/* Determine if any platform actions need to be executed. */
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if (juno_do_plat_actions(afflvl, state) == -EAGAIN)
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return PSCI_E_SUCCESS;
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/*
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* Perform the common cluster specific operations i.e enable coherency
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* if this cluster was off.
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*/
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if (afflvl != MPIDR_AFFLVL0)
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cci_enable_cluster_coherency(mpidr);
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/* Enable the gic cpu interface */
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gic_cpuif_setup(GICC_BASE);
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/* Juno todo: Is this setup only needed after a cold boot? */
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gic_pcpu_distif_setup(GICD_BASE);
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/* Clear the mailbox for this cpu. */
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juno_program_mailbox(mpidr, 0);
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return PSCI_E_SUCCESS;
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}
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/*******************************************************************************
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* Common function called while turning a cpu off or suspending it. It is called
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* from juno_off() or juno_suspend() when these functions in turn are called for
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* the highest affinity level which will be powered down. It performs the
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* actions common to the OFF and SUSPEND calls.
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******************************************************************************/
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static int32_t juno_power_down_common(uint32_t afflvl)
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{
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uint32_t cluster_state = scpi_power_on;
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/* Prevent interrupts from spuriously waking up this cpu */
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gic_cpuif_deactivate(GICC_BASE);
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/* Cluster is to be turned off, so disable coherency */
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if (afflvl > MPIDR_AFFLVL0) {
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cci_disable_cluster_coherency(read_mpidr_el1());
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cluster_state = scpi_power_off;
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}
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/*
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* Ask the SCP to power down the appropriate components depending upon
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* their state.
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*/
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scpi_set_css_power_state(read_mpidr_el1(),
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scpi_power_off,
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cluster_state,
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scpi_power_on);
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return PSCI_E_SUCCESS;
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}
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/*******************************************************************************
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* Handler called when an affinity instance is about to be turned off. The
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* level and mpidr determine the affinity instance. The 'state' arg. allows the
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* platform to decide whether the cluster is being turned off and take
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* appropriate actions.
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*
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* CAUTION: There is no guarantee that caches will remain turned on across calls
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* to this function as each affinity level is dealt with. So do not write & read
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* global variables across calls. It will be wise to do flush a write to the
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* global to prevent unpredictable results.
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******************************************************************************/
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static int32_t juno_affinst_off(uint64_t mpidr, uint32_t afflvl, uint32_t state)
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{
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/* Determine if any platform actions need to be executed */
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if (juno_do_plat_actions(afflvl, state) == -EAGAIN)
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return PSCI_E_SUCCESS;
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return juno_power_down_common(afflvl);
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}
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/*******************************************************************************
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* Handler called when an affinity instance is about to be suspended. The
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* level and mpidr determine the affinity instance. The 'state' arg. allows the
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* platform to decide whether the cluster is being turned off and take apt
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* actions. The 'sec_entrypoint' determines the address in BL3-1 from where
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* execution should resume.
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*
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* CAUTION: There is no guarantee that caches will remain turned on across calls
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* to this function as each affinity level is dealt with. So do not write & read
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* global variables across calls. It will be wise to do flush a write to the
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* global to prevent unpredictable results.
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******************************************************************************/
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static int32_t juno_affinst_suspend(uint64_t mpidr,
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uint64_t sec_entrypoint,
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uint64_t ns_entrypoint,
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uint32_t afflvl,
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uint32_t state)
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{
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/* Determine if any platform actions need to be executed */
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if (juno_do_plat_actions(afflvl, state) == -EAGAIN)
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return PSCI_E_SUCCESS;
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/*
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* Setup mailbox with address for CPU entrypoint when it next powers up.
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*/
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juno_program_mailbox(mpidr, sec_entrypoint);
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return juno_power_down_common(afflvl);
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}
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/*******************************************************************************
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* Juno handler called when an affinity instance has just been powered on after
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* having been suspended earlier. The level and mpidr determine the affinity
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* instance.
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* TODO: At the moment we reuse the on finisher and reinitialize the secure
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* context. Need to implement a separate suspend finisher.
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******************************************************************************/
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static int32_t juno_affinst_suspend_finish(uint64_t mpidr,
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uint32_t afflvl,
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uint32_t state)
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{
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return juno_affinst_on_finish(mpidr, afflvl, state);
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}
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/*******************************************************************************
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* Juno handlers to shutdown/reboot the system
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******************************************************************************/
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static void __dead2 juno_system_off(void)
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{
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uint32_t response;
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/* Send the power down request to the SCP */
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response = scpi_sys_power_state(scpi_system_shutdown);
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if (response != SCP_OK) {
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ERROR("Juno System Off: SCP error %u.\n", response);
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panic();
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}
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wfi();
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ERROR("Juno System Off: operation not handled.\n");
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panic();
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}
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static void __dead2 juno_system_reset(void)
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{
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uint32_t response;
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/* Send the system reset request to the SCP */
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response = scpi_sys_power_state(scpi_system_reboot);
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if (response != SCP_OK) {
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ERROR("Juno System Reset: SCP error %u.\n", response);
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panic();
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}
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wfi();
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ERROR("Juno System Reset: operation not handled.\n");
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panic();
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}
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/*******************************************************************************
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* Export the platform handlers to enable psci to invoke them
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******************************************************************************/
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static const plat_pm_ops_t juno_ops = {
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.affinst_on = juno_affinst_on,
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.affinst_on_finish = juno_affinst_on_finish,
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.affinst_off = juno_affinst_off,
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.affinst_suspend = juno_affinst_suspend,
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.affinst_suspend_finish = juno_affinst_suspend_finish,
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.system_off = juno_system_off,
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.system_reset = juno_system_reset
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};
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/*******************************************************************************
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* Export the platform specific power ops.
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******************************************************************************/
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int32_t platform_setup_pm(const plat_pm_ops_t **plat_ops)
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{
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*plat_ops = &juno_ops;
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return 0;
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}
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