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/*
* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <errno.h>
#include <platform_def.h>
#include <arch_helpers.h>
#include <common/debug.h>
#include <lib/cassert.h>
#include <plat/common/platform.h>
#include <css_pm.h>
#include <plat_arm.h>
#include "../drivers/scp/css_scp.h"
/* Allow CSS platforms to override `plat_arm_psci_pm_ops` */
#pragma weak plat_arm_psci_pm_ops
#if ARM_RECOM_STATE_ID_ENC
/*
* The table storing the valid idle power states. Ensure that the
* array entries are populated in ascending order of state-id to
* enable us to use binary search during power state validation.
* The table must be terminated by a NULL entry.
*/
const unsigned int arm_pm_idle_states[] = {
/* State-id - 0x001 */
arm_make_pwrstate_lvl2(ARM_LOCAL_STATE_RUN, ARM_LOCAL_STATE_RUN,
ARM_LOCAL_STATE_RET, ARM_PWR_LVL0, PSTATE_TYPE_STANDBY),
/* State-id - 0x002 */
arm_make_pwrstate_lvl2(ARM_LOCAL_STATE_RUN, ARM_LOCAL_STATE_RUN,
ARM_LOCAL_STATE_OFF, ARM_PWR_LVL0, PSTATE_TYPE_POWERDOWN),
/* State-id - 0x022 */
arm_make_pwrstate_lvl2(ARM_LOCAL_STATE_RUN, ARM_LOCAL_STATE_OFF,
ARM_LOCAL_STATE_OFF, ARM_PWR_LVL1, PSTATE_TYPE_POWERDOWN),
#if PLAT_MAX_PWR_LVL > ARM_PWR_LVL1
/* State-id - 0x222 */
arm_make_pwrstate_lvl2(ARM_LOCAL_STATE_OFF, ARM_LOCAL_STATE_OFF,
ARM_LOCAL_STATE_OFF, ARM_PWR_LVL2, PSTATE_TYPE_POWERDOWN),
#endif
0,
};
#endif /* __ARM_RECOM_STATE_ID_ENC__ */
/*
* All the power management helpers in this file assume at least cluster power
* level is supported.
*/
CASSERT(PLAT_MAX_PWR_LVL >= ARM_PWR_LVL1,
assert_max_pwr_lvl_supported_mismatch);
/*
* Ensure that the PLAT_MAX_PWR_LVL is not greater than CSS_SYSTEM_PWR_DMN_LVL
* assumed by the CSS layer.
*/
CASSERT(PLAT_MAX_PWR_LVL <= CSS_SYSTEM_PWR_DMN_LVL,
assert_max_pwr_lvl_higher_than_css_sys_lvl);
/*******************************************************************************
* Handler called when a power domain is about to be turned on. The
* level and mpidr determine the affinity instance.
******************************************************************************/
int css_pwr_domain_on(u_register_t mpidr)
{
css_scp_on(mpidr);
return PSCI_E_SUCCESS;
}
static void css_pwr_domain_on_finisher_common(
const psci_power_state_t *target_state)
{
assert(CSS_CORE_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF);
/* Enable the gic cpu interface */
plat_arm_gic_cpuif_enable();
/*
* Perform the common cluster specific operations i.e enable coherency
* if this cluster was off.
*/
if (CSS_CLUSTER_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF)
plat_arm_interconnect_enter_coherency();
}
/*******************************************************************************
* Handler called when a power level has just been powered on after
* being turned off earlier. The target_state encodes the low power state that
* each level has woken up from. This handler would never be invoked with
* the system power domain uninitialized as either the primary would have taken
* care of it as part of cold boot or the first core awakened from system
* suspend would have already initialized it.
******************************************************************************/
void css_pwr_domain_on_finish(const psci_power_state_t *target_state)
{
/* Assert that the system power domain need not be initialized */
assert(css_system_pwr_state(target_state) == ARM_LOCAL_STATE_RUN);
/* Program the gic per-cpu distributor or re-distributor interface */
plat_arm_gic_pcpu_init();
css_pwr_domain_on_finisher_common(target_state);
}
/*******************************************************************************
* Common function called while turning a cpu off or suspending it. It is called
* from css_off() or css_suspend() when these functions in turn are called for
* power domain at the highest power level which will be powered down. It
* performs the actions common to the OFF and SUSPEND calls.
******************************************************************************/
static void css_power_down_common(const psci_power_state_t *target_state)
{
/* Prevent interrupts from spuriously waking up this cpu */
plat_arm_gic_cpuif_disable();
/* Cluster is to be turned off, so disable coherency */
if (CSS_CLUSTER_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF)
plat_arm_interconnect_exit_coherency();
}
/*******************************************************************************
* Handler called when a power domain is about to be turned off. The
* target_state encodes the power state that each level should transition to.
******************************************************************************/
void css_pwr_domain_off(const psci_power_state_t *target_state)
{
assert(CSS_CORE_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF);
css_power_down_common(target_state);
css_scp_off(target_state);
}
/*******************************************************************************
* Handler called when a power domain is about to be suspended. The
* target_state encodes the power state that each level should transition to.
******************************************************************************/
void css_pwr_domain_suspend(const psci_power_state_t *target_state)
{
/*
* CSS currently supports retention only at cpu level. Just return
* as nothing is to be done for retention.
*/
if (CSS_CORE_PWR_STATE(target_state) == ARM_LOCAL_STATE_RET)
return;
assert(CSS_CORE_PWR_STATE(target_state) == ARM_LOCAL_STATE_OFF);
css_power_down_common(target_state);
/* Perform system domain state saving if issuing system suspend */
if (css_system_pwr_state(target_state) == ARM_LOCAL_STATE_OFF) {
arm_system_pwr_domain_save();
/* Power off the Redistributor after having saved its context */
plat_arm_gic_redistif_off();
}
css_scp_suspend(target_state);
}
/*******************************************************************************
* Handler called when a power domain has just been powered on after
* having been suspended earlier. The target_state encodes the low power state
* that each level has woken up from.
* TODO: At the moment we reuse the on finisher and reinitialize the secure
* context. Need to implement a separate suspend finisher.
******************************************************************************/
void css_pwr_domain_suspend_finish(
const psci_power_state_t *target_state)
{
/* Return as nothing is to be done on waking up from retention. */
if (CSS_CORE_PWR_STATE(target_state) == ARM_LOCAL_STATE_RET)
return;
/* Perform system domain restore if woken up from system suspend */
if (css_system_pwr_state(target_state) == ARM_LOCAL_STATE_OFF)
/*
* At this point, the Distributor must be powered on to be ready
* to have its state restored. The Redistributor will be powered
* on as part of gicv3_rdistif_init_restore.
*/
arm_system_pwr_domain_resume();
css_pwr_domain_on_finisher_common(target_state);
}
/*******************************************************************************
* Handlers to shutdown/reboot the system
******************************************************************************/
void __dead2 css_system_off(void)
{
css_scp_sys_shutdown();
}
void __dead2 css_system_reset(void)
{
css_scp_sys_reboot();
}
/*******************************************************************************
* Handler called when the CPU power domain is about to enter standby.
******************************************************************************/
void css_cpu_standby(plat_local_state_t cpu_state)
{
unsigned int scr;
assert(cpu_state == ARM_LOCAL_STATE_RET);
scr = read_scr_el3();
/*
* Enable the Non secure interrupt to wake the CPU.
* In GICv3 affinity routing mode, the non secure group1 interrupts use
* the PhysicalFIQ at EL3 whereas in GICv2, it uses the PhysicalIRQ.
* Enabling both the bits works for both GICv2 mode and GICv3 affinity
* routing mode.
*/
write_scr_el3(scr | SCR_IRQ_BIT | SCR_FIQ_BIT);
isb();
dsb();
wfi();
/*
* Restore SCR to the original value, synchronisation of scr_el3 is
* done by eret while el3_exit to save some execution cycles.
*/
write_scr_el3(scr);
}
/*******************************************************************************
* Handler called to return the 'req_state' for system suspend.
******************************************************************************/
void css_get_sys_suspend_power_state(psci_power_state_t *req_state)
{
unsigned int i;
/*
* System Suspend is supported only if the system power domain node
* is implemented.
*/
assert(PLAT_MAX_PWR_LVL == CSS_SYSTEM_PWR_DMN_LVL);
for (i = ARM_PWR_LVL0; i <= PLAT_MAX_PWR_LVL; i++)
req_state->pwr_domain_state[i] = ARM_LOCAL_STATE_OFF;
}
/*******************************************************************************
* Handler to query CPU/cluster power states from SCP
******************************************************************************/
int css_node_hw_state(u_register_t mpidr, unsigned int power_level)
{
return css_scp_get_power_state(mpidr, power_level);
}
/*
* The system power domain suspend is only supported only via
* PSCI SYSTEM_SUSPEND API. PSCI CPU_SUSPEND request to system power domain
* will be downgraded to the lower level.
*/
static int css_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 we don't overrun the pwr_domain_state array in the case
* where the platform supported max power level is less than the system
* power level
*/
#if (PLAT_MAX_PWR_LVL == CSS_SYSTEM_PWR_DMN_LVL)
/*
* 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[CSS_SYSTEM_PWR_DMN_LVL] =
ARM_LOCAL_STATE_RUN;
#endif
return rc;
}
/*
* Custom `translate_power_state_by_mpidr` handler for CSS. Unlike in the
* `css_validate_power_state`, we do not downgrade 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 css_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.
******************************************************************************/
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 = css_validate_power_state,
.validate_ns_entrypoint = arm_validate_psci_entrypoint,
.translate_power_state_by_mpidr = css_translate_power_state_by_mpidr,
.get_node_hw_state = css_node_hw_state,
.get_sys_suspend_power_state = css_get_sys_suspend_power_state,
#if defined(PLAT_ARM_MEM_PROT_ADDR)
.mem_protect_chk = arm_psci_mem_protect_chk,
.read_mem_protect = arm_psci_read_mem_protect,
.write_mem_protect = arm_nor_psci_write_mem_protect,
#endif
#if CSS_USE_SCMI_SDS_DRIVER
.system_reset2 = css_system_reset2,
#endif
};