blob: 6019182a1c8d200d42dabf95098cc9ee1a431e9c [file] [log] [blame]
/*
* Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <platform_def.h>
#include <arch_helpers.h>
#include <common/bl_common.h>
#include <common/debug.h>
#include <context.h>
#include <drivers/console.h>
#include <lib/el3_runtime/context_mgmt.h>
#include <lib/mmio.h>
#include <lib/psci/psci.h>
#include <plat/common/platform.h>
#include <memctrl.h>
#include <pmc.h>
#include <tegra_def.h>
#include <tegra_platform.h>
#include <tegra_private.h>
extern uint64_t tegra_bl31_phys_base;
extern uint64_t tegra_sec_entry_point;
/*******************************************************************************
* This handler is called by the PSCI implementation during the `SYSTEM_SUSPEND`
* call to get the `power_state` parameter. This allows the platform to encode
* the appropriate State-ID field within the `power_state` parameter which can
* be utilized in `pwr_domain_suspend()` to suspend to system affinity level.
******************************************************************************/
static void tegra_get_sys_suspend_power_state(psci_power_state_t *req_state)
{
/* all affinities use system suspend state id */
for (uint32_t i = MPIDR_AFFLVL0; i <= PLAT_MAX_PWR_LVL; i++) {
req_state->pwr_domain_state[i] = PSTATE_ID_SOC_POWERDN;
}
}
/*******************************************************************************
* Handler called when an affinity instance is about to enter standby.
******************************************************************************/
static void tegra_cpu_standby(plat_local_state_t cpu_state)
{
u_register_t saved_scr_el3;
(void)cpu_state;
/* Tegra SoC specific handler */
if (tegra_soc_cpu_standby(cpu_state) != PSCI_E_SUCCESS)
ERROR("%s failed\n", __func__);
saved_scr_el3 = read_scr_el3();
/*
* As per ARM ARM D1.17.2, any physical IRQ interrupt received by the
* PE will be treated as a wake-up event, if SCR_EL3.IRQ is set to '1',
* irrespective of the value of the PSTATE.I bit value.
*/
write_scr_el3(saved_scr_el3 | SCR_IRQ_BIT);
/*
* Enter standby state
*
* dsb & isb is good practice before using wfi to enter low power states
*/
dsb();
isb();
wfi();
/*
* Restore saved scr_el3 that has IRQ bit cleared as we don't want EL3
* handling any further interrupts
*/
write_scr_el3(saved_scr_el3);
}
/*******************************************************************************
* Handler called when an affinity instance is about to be turned on. The
* level and mpidr determine the affinity instance.
******************************************************************************/
static int32_t tegra_pwr_domain_on(u_register_t mpidr)
{
return tegra_soc_pwr_domain_on(mpidr);
}
/*******************************************************************************
* 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.
******************************************************************************/
static void tegra_pwr_domain_off(const psci_power_state_t *target_state)
{
(void)tegra_soc_pwr_domain_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.
* This handler is called with SMP and data cache enabled, when
* HW_ASSISTED_COHERENCY = 0
******************************************************************************/
void tegra_pwr_domain_suspend_pwrdown_early(const psci_power_state_t *target_state)
{
tegra_soc_pwr_domain_suspend_pwrdown_early(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.
******************************************************************************/
static void tegra_pwr_domain_suspend(const psci_power_state_t *target_state)
{
(void)tegra_soc_pwr_domain_suspend(target_state);
/* Disable console if we are entering deep sleep. */
if (target_state->pwr_domain_state[PLAT_MAX_PWR_LVL] ==
PSTATE_ID_SOC_POWERDN) {
(void)console_flush();
console_switch_state(0);
}
/* disable GICC */
tegra_gic_cpuif_deactivate();
}
/*******************************************************************************
* Handler called at the end of the power domain suspend sequence. The
* target_state encodes the power state that each level should transition to.
******************************************************************************/
static __dead2 void tegra_pwr_domain_power_down_wfi(const psci_power_state_t
*target_state)
{
/* call the chip's power down handler */
(void)tegra_soc_pwr_domain_power_down_wfi(target_state);
wfi();
panic();
}
/*******************************************************************************
* Handler called when a power domain 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.
******************************************************************************/
static void tegra_pwr_domain_on_finish(const psci_power_state_t *target_state)
{
const plat_params_from_bl2_t *plat_params;
/*
* Check if we are exiting from deep sleep.
*/
if (target_state->pwr_domain_state[PLAT_MAX_PWR_LVL] ==
PSTATE_ID_SOC_POWERDN) {
/*
* On entering System Suspend state, the GIC loses power
* completely. Initialize the GIC global distributor and
* GIC cpu interfaces.
*/
tegra_gic_init();
/* Restart console output. */
console_switch_state(CONSOLE_FLAG_RUNTIME);
/*
* Restore Memory Controller settings as it loses state
* during system suspend.
*/
tegra_memctrl_restore_settings();
/*
* Security configuration to allow DRAM/device access.
*/
plat_params = bl31_get_plat_params();
tegra_memctrl_tzdram_setup(plat_params->tzdram_base,
(uint32_t)plat_params->tzdram_size);
} else {
/*
* Initialize the GIC cpu and distributor interfaces
*/
tegra_gic_pcpu_init();
}
/*
* Reset hardware settings.
*/
(void)tegra_soc_pwr_domain_on_finish(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.
******************************************************************************/
static void tegra_pwr_domain_suspend_finish(const psci_power_state_t *target_state)
{
tegra_pwr_domain_on_finish(target_state);
}
/*******************************************************************************
* Handler called when the system wants to be powered off
******************************************************************************/
static __dead2 void tegra_system_off(void)
{
INFO("Powering down system...\n");
tegra_soc_prepare_system_off();
}
/*******************************************************************************
* Handler called when the system wants to be restarted.
******************************************************************************/
static __dead2 void tegra_system_reset(void)
{
INFO("Restarting system...\n");
/* per-SoC system reset handler */
(void)tegra_soc_prepare_system_reset();
/* wait for the system to reset */
for (;;) {
;
}
}
/*******************************************************************************
* Handler called to check the validity of the power state parameter.
******************************************************************************/
static int32_t tegra_validate_power_state(uint32_t power_state,
psci_power_state_t *req_state)
{
assert(req_state != NULL);
return tegra_soc_validate_power_state(power_state, req_state);
}
/*******************************************************************************
* Platform handler called to check the validity of the non secure entrypoint.
******************************************************************************/
static int32_t tegra_validate_ns_entrypoint(uintptr_t entrypoint)
{
int32_t ret = PSCI_E_INVALID_ADDRESS;
/*
* Check if the non secure entrypoint lies within the non
* secure DRAM.
*/
if ((entrypoint >= TEGRA_DRAM_BASE) && (entrypoint <= TEGRA_DRAM_END)) {
ret = PSCI_E_SUCCESS;
}
return ret;
}
/*******************************************************************************
* Export the platform handlers to enable psci to invoke them
******************************************************************************/
static plat_psci_ops_t tegra_plat_psci_ops = {
.cpu_standby = tegra_cpu_standby,
.pwr_domain_on = tegra_pwr_domain_on,
.pwr_domain_off = tegra_pwr_domain_off,
.pwr_domain_suspend_pwrdown_early = tegra_pwr_domain_suspend_pwrdown_early,
.pwr_domain_suspend = tegra_pwr_domain_suspend,
.pwr_domain_on_finish = tegra_pwr_domain_on_finish,
.pwr_domain_suspend_finish = tegra_pwr_domain_suspend_finish,
.pwr_domain_pwr_down_wfi = tegra_pwr_domain_power_down_wfi,
.system_off = tegra_system_off,
.system_reset = tegra_system_reset,
.validate_power_state = tegra_validate_power_state,
.validate_ns_entrypoint = tegra_validate_ns_entrypoint,
.get_sys_suspend_power_state = tegra_get_sys_suspend_power_state,
};
/*******************************************************************************
* Export the platform specific power ops and initialize Power Controller
******************************************************************************/
int plat_setup_psci_ops(uintptr_t sec_entrypoint,
const plat_psci_ops_t **psci_ops)
{
psci_power_state_t target_state = { { PSCI_LOCAL_STATE_RUN } };
/*
* Flush entrypoint variable to PoC since it will be
* accessed after a reset with the caches turned off.
*/
tegra_sec_entry_point = sec_entrypoint;
flush_dcache_range((uint64_t)&tegra_sec_entry_point, sizeof(uint64_t));
/*
* Reset hardware settings.
*/
(void)tegra_soc_pwr_domain_on_finish(&target_state);
/*
* Disable System Suspend if the platform does not
* support it
*/
if (!plat_supports_system_suspend()) {
tegra_plat_psci_ops.get_sys_suspend_power_state = NULL;
}
/*
* Initialize PSCI ops struct
*/
*psci_ops = &tegra_plat_psci_ops;
return 0;
}
/*******************************************************************************
* Platform handler to calculate the proper target power level at the
* specified affinity level
******************************************************************************/
plat_local_state_t plat_get_target_pwr_state(unsigned int lvl,
const plat_local_state_t *states,
unsigned int ncpu)
{
return tegra_soc_get_target_pwr_state(lvl, states, ncpu);
}