| /* |
| * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch_helpers.h> |
| #include <assert.h> |
| #include <css_def.h> |
| #include <css_pm.h> |
| #include <debug.h> |
| #include <plat_arm.h> |
| #include <platform.h> |
| #include <string.h> |
| #include "../scmi/scmi.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(pwr_state, max_lvl) \ |
| (pwr_state) |= ((max_lvl) & SCMI_PWR_STATE_MAX_PWR_LVL_MASK) \ |
| << SCMI_PWR_STATE_MAX_PWR_LVL_SHIFT |
| #define SCMI_GET_PWR_STATE_MAX_PWR_LVL(pwr_state) \ |
| (((pwr_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(pwr_state, lvl, lvl_state) \ |
| (pwr_state) |= ((lvl_state) & SCMI_PWR_STATE_LVL_MASK) \ |
| << (SCMI_PWR_STATE_LVL_WIDTH * (lvl)) |
| #define SCMI_GET_PWR_STATE_LVL(pwr_state, lvl) \ |
| (((pwr_state) >> (SCMI_PWR_STATE_LVL_WIDTH * (lvl))) & \ |
| 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; |
| |
| /* |
| * This mapping array has to be exported by the platform. Each element at |
| * a given index maps that core to an SCMI power domain. |
| */ |
| extern uint32_t plat_css_core_pos_to_scmi_dmn_id_map[]; |
| |
| /* |
| * The global handle for invoking the SCMI driver APIs after the driver |
| * has been initialized. |
| */ |
| void *scmi_handle; |
| |
| /* The SCMI channel global object */ |
| static scmi_channel_t scmi_channel; |
| |
| ARM_INSTANTIATE_LOCK |
| |
| /* |
| * Helper function to suspend a CPU power domain and its parent power domains |
| * if applicable. |
| */ |
| void css_scp_suspend(const psci_power_state_t *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 psci_power_state_t *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; |
| 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); |
| |
| ret = scmi_pwr_state_set(scmi_handle, |
| plat_css_core_pos_to_scmi_dmn_id_map[plat_core_pos_by_mpidr(mpidr)], |
| 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; |
| } |
| |
| /* |
| * Helper function to shutdown the system via SCMI. |
| */ |
| void __dead2 css_scp_sys_shutdown(void) |
| { |
| 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 for SYSTEM_SHUTDOWN. 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, |
| SCMI_SYS_PWR_SHUTDOWN); |
| if (ret != SCMI_E_SUCCESS) { |
| ERROR("SCMI system power domain shutdown return 0x%x unexpected\n", |
| ret); |
| panic(); |
| } |
| |
| wfi(); |
| ERROR("CSS System Shutdown: operation not handled.\n"); |
| panic(); |
| } |
| |
| /* |
| * Helper function to reset the system via SCMI. |
| */ |
| void __dead2 css_scp_sys_reboot(void) |
| { |
| 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 for SYSTEM_REBOOT. 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, |
| SCMI_SYS_PWR_COLD_RESET); |
| if (ret != SCMI_E_SUCCESS) { |
| ERROR("SCMI system power domain reset return 0x%x unexpected\n", |
| ret); |
| panic(); |
| } |
| |
| wfi(); |
| ERROR("CSS System Reset: operation not handled.\n"); |
| panic(); |
| } |
| |
| 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 = 0xfffffffd, |
| .db_modify_mask = 0x2, |
| }; |
| |
| void plat_arm_pwrc_setup(void) |
| { |
| scmi_channel.info = &plat_css_scmi_plat_info; |
| scmi_channel.lock = ARM_LOCK_GET_INSTANCE; |
| scmi_handle = scmi_init(&scmi_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; |
| } |
| |
| return ops; |
| } |