/* * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include #include #include #include #include #include #include #include #include #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 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; 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 };