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/*
* Copyright (c) 2013-2016, 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 <debug.h>
#include <platform.h>
#include <smcc.h>
#include <string.h>
#include "psci_private.h"
/*******************************************************************************
* PSCI frontend api for servicing SMCs. Described in the PSCI spec.
******************************************************************************/
int psci_cpu_on(u_register_t target_cpu,
uintptr_t entrypoint,
u_register_t context_id)
{
int rc;
entry_point_info_t ep;
/* Determine if the cpu exists of not */
rc = psci_validate_mpidr(target_cpu);
if (rc != PSCI_E_SUCCESS)
return PSCI_E_INVALID_PARAMS;
/* Validate the entry point and get the entry_point_info */
rc = psci_validate_entry_point(&ep, entrypoint, context_id);
if (rc != PSCI_E_SUCCESS)
return rc;
/*
* To turn this cpu on, specify which power
* levels need to be turned on
*/
return psci_cpu_on_start(target_cpu, &ep);
}
unsigned int psci_version(void)
{
return PSCI_MAJOR_VER | PSCI_MINOR_VER;
}
int psci_cpu_suspend(unsigned int power_state,
uintptr_t entrypoint,
u_register_t context_id)
{
int rc;
unsigned int target_pwrlvl, is_power_down_state;
entry_point_info_t ep;
psci_power_state_t state_info = { {PSCI_LOCAL_STATE_RUN} };
plat_local_state_t cpu_pd_state;
/* Validate the power_state parameter */
rc = psci_validate_power_state(power_state, &state_info);
if (rc != PSCI_E_SUCCESS) {
assert(rc == PSCI_E_INVALID_PARAMS);
return rc;
}
/*
* Get the value of the state type bit from the power state parameter.
*/
is_power_down_state = psci_get_pstate_type(power_state);
/* Sanity check the requested suspend levels */
assert(psci_validate_suspend_req(&state_info, is_power_down_state)
== PSCI_E_SUCCESS);
target_pwrlvl = psci_find_target_suspend_lvl(&state_info);
/* Fast path for CPU standby.*/
if (is_cpu_standby_req(is_power_down_state, target_pwrlvl)) {
if (!psci_plat_pm_ops->cpu_standby)
return PSCI_E_INVALID_PARAMS;
/*
* Set the state of the CPU power domain to the platform
* specific retention state and enter the standby state.
*/
cpu_pd_state = state_info.pwr_domain_state[PSCI_CPU_PWR_LVL];
psci_set_cpu_local_state(cpu_pd_state);
#if ENABLE_PSCI_STAT
/*
* Capture time-stamp before CPU standby
* No cache maintenance is needed as caches
* are ON through out the CPU standby operation.
*/
PMF_CAPTURE_TIMESTAMP(psci_svc, PSCI_STAT_ID_ENTER_LOW_PWR,
PMF_NO_CACHE_MAINT);
#endif
psci_plat_pm_ops->cpu_standby(cpu_pd_state);
/* Upon exit from standby, set the state back to RUN. */
psci_set_cpu_local_state(PSCI_LOCAL_STATE_RUN);
#if ENABLE_PSCI_STAT
/* Capture time-stamp after CPU standby */
PMF_CAPTURE_TIMESTAMP(psci_svc, PSCI_STAT_ID_EXIT_LOW_PWR,
PMF_NO_CACHE_MAINT);
/* Update PSCI stats */
psci_stats_update_pwr_up(PSCI_CPU_PWR_LVL, &state_info,
PMF_NO_CACHE_MAINT);
#endif
return PSCI_E_SUCCESS;
}
/*
* If a power down state has been requested, we need to verify entry
* point and program entry information.
*/
if (is_power_down_state) {
rc = psci_validate_entry_point(&ep, entrypoint, context_id);
if (rc != PSCI_E_SUCCESS)
return rc;
}
/*
* Do what is needed to enter the power down state. Upon success,
* enter the final wfi which will power down this CPU. This function
* might return if the power down was abandoned for any reason, e.g.
* arrival of an interrupt
*/
psci_cpu_suspend_start(&ep,
target_pwrlvl,
&state_info,
is_power_down_state);
return PSCI_E_SUCCESS;
}
int psci_system_suspend(uintptr_t entrypoint, u_register_t context_id)
{
int rc;
psci_power_state_t state_info;
entry_point_info_t ep;
/* Check if the current CPU is the last ON CPU in the system */
if (!psci_is_last_on_cpu())
return PSCI_E_DENIED;
/* Validate the entry point and get the entry_point_info */
rc = psci_validate_entry_point(&ep, entrypoint, context_id);
if (rc != PSCI_E_SUCCESS)
return rc;
/* Query the psci_power_state for system suspend */
psci_query_sys_suspend_pwrstate(&state_info);
/* Ensure that the psci_power_state makes sense */
assert(psci_find_target_suspend_lvl(&state_info) == PLAT_MAX_PWR_LVL);
assert(psci_validate_suspend_req(&state_info, PSTATE_TYPE_POWERDOWN)
== PSCI_E_SUCCESS);
assert(is_local_state_off(state_info.pwr_domain_state[PLAT_MAX_PWR_LVL]));
/*
* Do what is needed to enter the system suspend state. This function
* might return if the power down was abandoned for any reason, e.g.
* arrival of an interrupt
*/
psci_cpu_suspend_start(&ep,
PLAT_MAX_PWR_LVL,
&state_info,
PSTATE_TYPE_POWERDOWN);
return PSCI_E_SUCCESS;
}
int psci_cpu_off(void)
{
int rc;
unsigned int target_pwrlvl = PLAT_MAX_PWR_LVL;
/*
* Do what is needed to power off this CPU and possible higher power
* levels if it able to do so. Upon success, enter the final wfi
* which will power down this CPU.
*/
rc = psci_do_cpu_off(target_pwrlvl);
/*
* The only error cpu_off can return is E_DENIED. So check if that's
* indeed the case.
*/
assert(rc == PSCI_E_DENIED);
return rc;
}
int psci_affinity_info(u_register_t target_affinity,
unsigned int lowest_affinity_level)
{
unsigned int target_idx;
/* We dont support level higher than PSCI_CPU_PWR_LVL */
if (lowest_affinity_level > PSCI_CPU_PWR_LVL)
return PSCI_E_INVALID_PARAMS;
/* Calculate the cpu index of the target */
target_idx = plat_core_pos_by_mpidr(target_affinity);
if (target_idx == -1)
return PSCI_E_INVALID_PARAMS;
return psci_get_aff_info_state_by_idx(target_idx);
}
int psci_migrate(u_register_t target_cpu)
{
int rc;
u_register_t resident_cpu_mpidr;
rc = psci_spd_migrate_info(&resident_cpu_mpidr);
if (rc != PSCI_TOS_UP_MIG_CAP)
return (rc == PSCI_TOS_NOT_UP_MIG_CAP) ?
PSCI_E_DENIED : PSCI_E_NOT_SUPPORTED;
/*
* Migrate should only be invoked on the CPU where
* the Secure OS is resident.
*/
if (resident_cpu_mpidr != read_mpidr_el1())
return PSCI_E_NOT_PRESENT;
/* Check the validity of the specified target cpu */
rc = psci_validate_mpidr(target_cpu);
if (rc != PSCI_E_SUCCESS)
return PSCI_E_INVALID_PARAMS;
assert(psci_spd_pm && psci_spd_pm->svc_migrate);
rc = psci_spd_pm->svc_migrate(read_mpidr_el1(), target_cpu);
assert(rc == PSCI_E_SUCCESS || rc == PSCI_E_INTERN_FAIL);
return rc;
}
int psci_migrate_info_type(void)
{
u_register_t resident_cpu_mpidr;
return psci_spd_migrate_info(&resident_cpu_mpidr);
}
long psci_migrate_info_up_cpu(void)
{
u_register_t resident_cpu_mpidr;
int rc;
/*
* Return value of this depends upon what
* psci_spd_migrate_info() returns.
*/
rc = psci_spd_migrate_info(&resident_cpu_mpidr);
if (rc != PSCI_TOS_NOT_UP_MIG_CAP && rc != PSCI_TOS_UP_MIG_CAP)
return PSCI_E_INVALID_PARAMS;
return resident_cpu_mpidr;
}
int psci_features(unsigned int psci_fid)
{
unsigned int local_caps = psci_caps;
/* Check if it is a 64 bit function */
if (((psci_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_64)
local_caps &= PSCI_CAP_64BIT_MASK;
/* Check for invalid fid */
if (!(is_std_svc_call(psci_fid) && is_valid_fast_smc(psci_fid)
&& is_psci_fid(psci_fid)))
return PSCI_E_NOT_SUPPORTED;
/* Check if the psci fid is supported or not */
if (!(local_caps & define_psci_cap(psci_fid)))
return PSCI_E_NOT_SUPPORTED;
/* Format the feature flags */
if (psci_fid == PSCI_CPU_SUSPEND_AARCH32 ||
psci_fid == PSCI_CPU_SUSPEND_AARCH64) {
/*
* The trusted firmware does not support OS Initiated Mode.
*/
return (FF_PSTATE << FF_PSTATE_SHIFT) |
((!FF_SUPPORTS_OS_INIT_MODE) << FF_MODE_SUPPORT_SHIFT);
}
/* Return 0 for all other fid's */
return PSCI_E_SUCCESS;
}
/*******************************************************************************
* PSCI top level handler for servicing SMCs.
******************************************************************************/
u_register_t psci_smc_handler(uint32_t smc_fid,
u_register_t x1,
u_register_t x2,
u_register_t x3,
u_register_t x4,
void *cookie,
void *handle,
u_register_t flags)
{
if (is_caller_secure(flags))
return SMC_UNK;
/* Check the fid against the capabilities */
if (!(psci_caps & define_psci_cap(smc_fid)))
return SMC_UNK;
if (((smc_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_32) {
/* 32-bit PSCI function, clear top parameter bits */
x1 = (uint32_t)x1;
x2 = (uint32_t)x2;
x3 = (uint32_t)x3;
switch (smc_fid) {
case PSCI_VERSION:
return psci_version();
case PSCI_CPU_OFF:
return psci_cpu_off();
case PSCI_CPU_SUSPEND_AARCH32:
return psci_cpu_suspend(x1, x2, x3);
case PSCI_CPU_ON_AARCH32:
return psci_cpu_on(x1, x2, x3);
case PSCI_AFFINITY_INFO_AARCH32:
return psci_affinity_info(x1, x2);
case PSCI_MIG_AARCH32:
return psci_migrate(x1);
case PSCI_MIG_INFO_TYPE:
return psci_migrate_info_type();
case PSCI_MIG_INFO_UP_CPU_AARCH32:
return psci_migrate_info_up_cpu();
case PSCI_SYSTEM_SUSPEND_AARCH32:
return psci_system_suspend(x1, x2);
case PSCI_SYSTEM_OFF:
psci_system_off();
/* We should never return from psci_system_off() */
case PSCI_SYSTEM_RESET:
psci_system_reset();
/* We should never return from psci_system_reset() */
case PSCI_FEATURES:
return psci_features(x1);
#if ENABLE_PSCI_STAT
case PSCI_STAT_RESIDENCY_AARCH32:
return psci_stat_residency(x1, x2);
case PSCI_STAT_COUNT_AARCH32:
return psci_stat_count(x1, x2);
#endif
default:
break;
}
} else {
/* 64-bit PSCI function */
switch (smc_fid) {
case PSCI_CPU_SUSPEND_AARCH64:
return psci_cpu_suspend(x1, x2, x3);
case PSCI_CPU_ON_AARCH64:
return psci_cpu_on(x1, x2, x3);
case PSCI_AFFINITY_INFO_AARCH64:
return psci_affinity_info(x1, x2);
case PSCI_MIG_AARCH64:
return psci_migrate(x1);
case PSCI_MIG_INFO_UP_CPU_AARCH64:
return psci_migrate_info_up_cpu();
case PSCI_SYSTEM_SUSPEND_AARCH64:
return psci_system_suspend(x1, x2);
#if ENABLE_PSCI_STAT
case PSCI_STAT_RESIDENCY_AARCH64:
return psci_stat_residency(x1, x2);
case PSCI_STAT_COUNT_AARCH64:
return psci_stat_count(x1, x2);
#endif
default:
break;
}
}
WARN("Unimplemented PSCI Call: 0x%x \n", smc_fid);
return SMC_UNK;
}