blob: cbf994a4713f0ff10a6b33b4c892520c245ab905 [file] [log] [blame]
/*
* Copyright (c) 2015, 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 <css_pm.h>
#include <plat_arm.h>
/*
* Custom `validate_power_state` handler for Juno. According to PSCI
* Specification, interrupts targeted to cores in PSCI CPU SUSPEND should
* be able to resume it. On Juno, when the system power domain is suspended,
* the GIC is also powered down. The SCP resumes the final core to be suspend
* when an external wake-up event is received. But the other cores cannot be
* woken up by a targeted interrupt, because GIC doesn't forward these
* interrupts to the SCP. Due to this hardware limitation, we down-grade PSCI
* CPU SUSPEND requests targeted to the system power domain level
* to cluster power domain level.
*
* The system power domain suspend on Juno is only supported only via
* PSCI SYSTEM SUSPEND API.
*/
static int juno_validate_power_state(unsigned int power_state,
psci_power_state_t *req_state)
{
int rc;
rc = arm_validate_power_state(power_state, req_state);
/*
* Ensure that the system power domain level is never suspended
* via PSCI CPU SUSPEND API. Currently system suspend is only
* supported via PSCI SYSTEM SUSPEND API.
*/
req_state->pwr_domain_state[ARM_PWR_LVL2] = ARM_LOCAL_STATE_RUN;
return rc;
}
/*
* Custom `translate_power_state_by_mpidr` handler for Juno. Unlike in the
* `juno_validate_power_state`, we do not down-grade the system power
* domain level request in `power_state` as it will be used to query the
* PSCI_STAT_COUNT/RESIDENCY at the system power domain level.
*/
static int juno_translate_power_state_by_mpidr(u_register_t mpidr,
unsigned int power_state,
psci_power_state_t *output_state)
{
return arm_validate_power_state(power_state, output_state);
}
/*******************************************************************************
* Export the platform handlers via plat_arm_psci_pm_ops. The ARM Standard
* platform will take care of registering the handlers with PSCI.
******************************************************************************/
const plat_psci_ops_t plat_arm_psci_pm_ops = {
.pwr_domain_on = css_pwr_domain_on,
.pwr_domain_on_finish = css_pwr_domain_on_finish,
.pwr_domain_off = css_pwr_domain_off,
.cpu_standby = css_cpu_standby,
.pwr_domain_suspend = css_pwr_domain_suspend,
.pwr_domain_suspend_finish = css_pwr_domain_suspend_finish,
.system_off = css_system_off,
.system_reset = css_system_reset,
.validate_power_state = juno_validate_power_state,
.validate_ns_entrypoint = arm_validate_ns_entrypoint,
.get_sys_suspend_power_state = css_get_sys_suspend_power_state,
.translate_power_state_by_mpidr = juno_translate_power_state_by_mpidr
};