/* * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ #include #include #include #include #include #include #include #include #include "../scmi/scmi.h" #include "../mhu/css_mhu_doorbell.h" #include "css_scp.h" /* * This file implements the SCP helper functions using SCMI protocol. */ /* * SCMI power state parameter bit field encoding for ARM CSS platforms. * * 31 20 19 16 15 12 11 8 7 4 3 0 * +-------------------------------------------------------------+ * | SBZ | Max level | Level 3 | Level 2 | Level 1 | Level 0 | * | | | state | state | state | state | * +-------------------------------------------------------------+ * * `Max level` encodes the highest level that has a valid power state * encoded in the power state. */ #define SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT 16 #define SCMI_PWR_STATE_MAX_PWR_LVL_WIDTH 4 #define SCMI_PWR_STATE_MAX_PWR_LVL_MASK \ ((1 << SCMI_PWR_STATE_MAX_PWR_LVL_WIDTH) - 1) #define SCMI_SET_PWR_STATE_MAX_PWR_LVL(_power_state, _max_level) \ (_power_state) |= ((_max_level) & SCMI_PWR_STATE_MAX_PWR_LVL_MASK)\ << SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT #define SCMI_GET_PWR_STATE_MAX_PWR_LVL(_power_state) \ (((_power_state) >> SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT) \ & SCMI_PWR_STATE_MAX_PWR_LVL_MASK) #define SCMI_PWR_STATE_LVL_WIDTH 4 #define SCMI_PWR_STATE_LVL_MASK \ ((1 << SCMI_PWR_STATE_LVL_WIDTH) - 1) #define SCMI_SET_PWR_STATE_LVL(_power_state, _level, _level_state) \ (_power_state) |= ((_level_state) & SCMI_PWR_STATE_LVL_MASK) \ << (SCMI_PWR_STATE_LVL_WIDTH * (_level)) #define SCMI_GET_PWR_STATE_LVL(_power_state, _level) \ (((_power_state) >> (SCMI_PWR_STATE_LVL_WIDTH * (_level))) & \ SCMI_PWR_STATE_LVL_MASK) /* * The SCMI power state enumeration for a power domain level */ typedef enum { scmi_power_state_off = 0, scmi_power_state_on = 1, scmi_power_state_sleep = 2, } scmi_power_state_t; /* * The global handle for invoking the SCMI driver APIs after the driver * has been initialized. */ static void *scmi_handle; /* The SCMI channel global object */ static scmi_channel_t channel; ARM_INSTANTIATE_LOCK; /* * Helper function to suspend a CPU power domain and its parent power domains * if applicable. */ void css_scp_suspend(const struct psci_power_state *target_state) { int lvl, ret; uint32_t scmi_pwr_state = 0; /* At least power domain level 0 should be specified to be suspended */ assert(target_state->pwr_domain_state[ARM_PWR_LVL0] == ARM_LOCAL_STATE_OFF); /* Check if power down at system power domain level is requested */ if (css_system_pwr_state(target_state) == ARM_LOCAL_STATE_OFF) { /* Issue SCMI command for SYSTEM_SUSPEND */ ret = scmi_sys_pwr_state_set(scmi_handle, SCMI_SYS_PWR_FORCEFUL_REQ, SCMI_SYS_PWR_SUSPEND); if (ret != SCMI_E_SUCCESS) { ERROR("SCMI system power domain suspend return 0x%x unexpected\n", ret); panic(); } return; } /* * If we reach here, then assert that power down at system power domain * level is running. */ assert(target_state->pwr_domain_state[CSS_SYSTEM_PWR_DMN_LVL] == ARM_LOCAL_STATE_RUN); /* For level 0, specify `scmi_power_state_sleep` as the power state */ SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, ARM_PWR_LVL0, scmi_power_state_sleep); for (lvl = ARM_PWR_LVL1; lvl <= PLAT_MAX_PWR_LVL; lvl++) { if (target_state->pwr_domain_state[lvl] == ARM_LOCAL_STATE_RUN) break; assert(target_state->pwr_domain_state[lvl] == ARM_LOCAL_STATE_OFF); /* * Specify `scmi_power_state_off` as power state for higher * levels. */ SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, lvl, scmi_power_state_off); } SCMI_SET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state, lvl - 1); ret = scmi_pwr_state_set(scmi_handle, plat_css_core_pos_to_scmi_dmn_id_map[plat_my_core_pos()], scmi_pwr_state); if (ret != SCMI_E_SUCCESS) { ERROR("SCMI set power state command return 0x%x unexpected\n", ret); panic(); } } /* * Helper function to turn off a CPU power domain and its parent power domains * if applicable. */ void css_scp_off(const struct psci_power_state *target_state) { int lvl = 0, ret; uint32_t scmi_pwr_state = 0; /* At-least the CPU level should be specified to be OFF */ assert(target_state->pwr_domain_state[ARM_PWR_LVL0] == ARM_LOCAL_STATE_OFF); /* PSCI CPU OFF cannot be used to turn OFF system power domain */ assert(target_state->pwr_domain_state[CSS_SYSTEM_PWR_DMN_LVL] == ARM_LOCAL_STATE_RUN); for (; lvl <= PLAT_MAX_PWR_LVL; lvl++) { if (target_state->pwr_domain_state[lvl] == ARM_LOCAL_STATE_RUN) break; assert(target_state->pwr_domain_state[lvl] == ARM_LOCAL_STATE_OFF); SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, lvl, scmi_power_state_off); } SCMI_SET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state, lvl - 1); ret = scmi_pwr_state_set(scmi_handle, plat_css_core_pos_to_scmi_dmn_id_map[plat_my_core_pos()], scmi_pwr_state); if (ret != SCMI_E_QUEUED && ret != SCMI_E_SUCCESS) { ERROR("SCMI set power state command return 0x%x unexpected\n", ret); panic(); } } /* * Helper function to turn ON a CPU power domain and its parent power domains * if applicable. */ void css_scp_on(u_register_t mpidr) { int lvl = 0, ret, core_pos; uint32_t scmi_pwr_state = 0; for (; lvl <= PLAT_MAX_PWR_LVL; lvl++) SCMI_SET_PWR_STATE_LVL(scmi_pwr_state, lvl, scmi_power_state_on); SCMI_SET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state, lvl - 1); core_pos = plat_core_pos_by_mpidr(mpidr); assert(core_pos >= 0 && core_pos < PLATFORM_CORE_COUNT); ret = scmi_pwr_state_set(scmi_handle, plat_css_core_pos_to_scmi_dmn_id_map[core_pos], scmi_pwr_state); if (ret != SCMI_E_QUEUED && ret != SCMI_E_SUCCESS) { ERROR("SCMI set power state command return 0x%x unexpected\n", ret); panic(); } } /* * Helper function to get the power state of a power domain node as reported * by the SCP. */ int css_scp_get_power_state(u_register_t mpidr, unsigned int power_level) { int ret, cpu_idx; uint32_t scmi_pwr_state = 0, lvl_state; /* We don't support get power state at the system power domain level */ if ((power_level > PLAT_MAX_PWR_LVL) || (power_level == CSS_SYSTEM_PWR_DMN_LVL)) { WARN("Invalid power level %u specified for SCMI get power state\n", power_level); return PSCI_E_INVALID_PARAMS; } cpu_idx = plat_core_pos_by_mpidr(mpidr); assert(cpu_idx > -1); ret = scmi_pwr_state_get(scmi_handle, plat_css_core_pos_to_scmi_dmn_id_map[cpu_idx], &scmi_pwr_state); if (ret != SCMI_E_SUCCESS) { WARN("SCMI get power state command return 0x%x unexpected\n", ret); return PSCI_E_INVALID_PARAMS; } /* * Find the maximum power level described in the get power state * command. If it is less than the requested power level, then assume * the requested power level is ON. */ if (SCMI_GET_PWR_STATE_MAX_PWR_LVL(scmi_pwr_state) < power_level) return HW_ON; lvl_state = SCMI_GET_PWR_STATE_LVL(scmi_pwr_state, power_level); if (lvl_state == scmi_power_state_on) return HW_ON; assert((lvl_state == scmi_power_state_off) || (lvl_state == scmi_power_state_sleep)); return HW_OFF; } void __dead2 css_scp_system_off(int state) { int ret; /* * Disable GIC CPU interface to prevent pending interrupt from waking * up the AP from WFI. */ plat_arm_gic_cpuif_disable(); /* * Issue SCMI command. First issue a graceful * request and if that fails force the request. */ ret = scmi_sys_pwr_state_set(scmi_handle, SCMI_SYS_PWR_FORCEFUL_REQ, state); if (ret != SCMI_E_SUCCESS) { ERROR("SCMI system power state set 0x%x returns unexpected 0x%x\n", state, ret); panic(); } wfi(); ERROR("CSS set power state: operation not handled.\n"); panic(); } /* * Helper function to shutdown the system via SCMI. */ void __dead2 css_scp_sys_shutdown(void) { css_scp_system_off(SCMI_SYS_PWR_SHUTDOWN); } /* * Helper function to reset the system via SCMI. */ void __dead2 css_scp_sys_reboot(void) { css_scp_system_off(SCMI_SYS_PWR_COLD_RESET); } static scmi_channel_plat_info_t plat_css_scmi_plat_info = { .scmi_mbx_mem = CSS_SCMI_PAYLOAD_BASE, .db_reg_addr = PLAT_CSS_MHU_BASE + CSS_SCMI_MHU_DB_REG_OFF, .db_preserve_mask = 0xfffffffe, .db_modify_mask = 0x1, .ring_doorbell = &mhu_ring_doorbell, }; void plat_arm_pwrc_setup(void) { channel.info = &plat_css_scmi_plat_info; channel.lock = ARM_LOCK_GET_INSTANCE; scmi_handle = scmi_init(&channel); if (scmi_handle == NULL) { ERROR("SCMI Initialization failed\n"); panic(); } } /****************************************************************************** * This function overrides the default definition for ARM platforms. Initialize * the SCMI driver, query capability via SCMI and modify the PSCI capability * based on that. *****************************************************************************/ const plat_psci_ops_t *plat_arm_psci_override_pm_ops(plat_psci_ops_t *ops) { uint32_t msg_attr; int ret; assert(scmi_handle); /* Check that power domain POWER_STATE_SET message is supported */ ret = scmi_proto_msg_attr(scmi_handle, SCMI_PWR_DMN_PROTO_ID, SCMI_PWR_STATE_SET_MSG, &msg_attr); if (ret != SCMI_E_SUCCESS) { ERROR("Set power state command is not supported by SCMI\n"); panic(); } /* * Don't support PSCI NODE_HW_STATE call if SCMI doesn't support * POWER_STATE_GET message. */ ret = scmi_proto_msg_attr(scmi_handle, SCMI_PWR_DMN_PROTO_ID, SCMI_PWR_STATE_GET_MSG, &msg_attr); if (ret != SCMI_E_SUCCESS) ops->get_node_hw_state = NULL; /* Check if the SCMI SYSTEM_POWER_STATE_SET message is supported */ ret = scmi_proto_msg_attr(scmi_handle, SCMI_SYS_PWR_PROTO_ID, SCMI_SYS_PWR_STATE_SET_MSG, &msg_attr); if (ret != SCMI_E_SUCCESS) { /* System power management operations are not supported */ ops->system_off = NULL; ops->system_reset = NULL; ops->get_sys_suspend_power_state = NULL; } else { if (!(msg_attr & SCMI_SYS_PWR_SUSPEND_SUPPORTED)) { /* * System power management protocol is available, but * it does not support SYSTEM SUSPEND. */ ops->get_sys_suspend_power_state = NULL; } if (!(msg_attr & SCMI_SYS_PWR_WARM_RESET_SUPPORTED)) { /* * WARM reset is not available. */ ops->system_reset2 = NULL; } } return ops; } int css_system_reset2(int is_vendor, int reset_type, u_register_t cookie) { if (is_vendor || (reset_type != PSCI_RESET2_SYSTEM_WARM_RESET)) return PSCI_E_INVALID_PARAMS; css_scp_system_off(SCMI_SYS_PWR_WARM_RESET); /* * css_scp_system_off cannot return (it is a __dead function), * but css_system_reset2 has to return some value, even in * this case. */ return 0; }