1 /* 2 * Copyright (c) 2018-2019, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 #include <plat_arm.h> 9 #include <plat_private.h> 10 #include <pm_common.h> 11 #include <common/debug.h> 12 #include <lib/mmio.h> 13 #include <lib/psci/psci.h> 14 #include <plat/common/platform.h> 15 16 #include "pm_api_sys.h" 17 #include "pm_client.h" 18 19 static uintptr_t versal_sec_entry; 20 21 static int versal_pwr_domain_on(u_register_t mpidr) 22 { 23 unsigned int cpu_id = plat_core_pos_by_mpidr(mpidr); 24 const struct pm_proc *proc; 25 26 VERBOSE("%s: mpidr: 0x%lx\n", __func__, mpidr); 27 28 if (cpu_id == -1) 29 return PSCI_E_INTERN_FAIL; 30 31 proc = pm_get_proc(cpu_id); 32 33 /* Send request to PMC to wake up selected ACPU core */ 34 pm_req_wakeup(proc->node_id, (versal_sec_entry & 0xFFFFFFFF) | 0x1, 35 versal_sec_entry >> 32, 0); 36 37 /* Clear power down request */ 38 pm_client_wakeup(proc); 39 40 return PSCI_E_SUCCESS; 41 } 42 43 /** 44 * versal_pwr_domain_suspend() - This function sends request to PMC to suspend 45 * core. 46 * 47 * @target_state Targated state 48 */ 49 static void versal_pwr_domain_suspend(const psci_power_state_t *target_state) 50 { 51 unsigned int state; 52 unsigned int cpu_id = plat_my_core_pos(); 53 const struct pm_proc *proc = pm_get_proc(cpu_id); 54 55 for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) 56 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 57 __func__, i, target_state->pwr_domain_state[i]); 58 59 plat_versal_gic_cpuif_disable(); 60 61 plat_versal_gic_save(); 62 63 state = target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE ? 64 PM_STATE_SUSPEND_TO_RAM : PM_STATE_CPU_IDLE; 65 66 /* Send request to PMC to suspend this core */ 67 pm_self_suspend(proc->node_id, MAX_LATENCY, state, versal_sec_entry); 68 69 /* APU is to be turned off */ 70 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 71 /* disable coherency */ 72 plat_arm_interconnect_exit_coherency(); 73 } 74 } 75 76 /** 77 * versal_pwr_domain_suspend_finish() - This function performs actions to finish 78 * suspend procedure. 79 * 80 * @target_state Targated state 81 */ 82 static void versal_pwr_domain_suspend_finish( 83 const psci_power_state_t *target_state) 84 { 85 unsigned int cpu_id = plat_my_core_pos(); 86 const struct pm_proc *proc = pm_get_proc(cpu_id); 87 88 for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) 89 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 90 __func__, i, target_state->pwr_domain_state[i]); 91 92 /* Clear the APU power control register for this cpu */ 93 pm_client_wakeup(proc); 94 95 /* enable coherency */ 96 plat_arm_interconnect_enter_coherency(); 97 98 /* APU was turned off, so restore GIC context */ 99 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 100 plat_versal_gic_resume(); 101 plat_versal_gic_cpuif_enable(); 102 } else { 103 plat_versal_gic_cpuif_enable(); 104 plat_versal_gic_pcpu_init(); 105 } 106 } 107 108 void versal_pwr_domain_on_finish(const psci_power_state_t *target_state) 109 { 110 /* Enable the gic cpu interface */ 111 plat_versal_gic_pcpu_init(); 112 113 /* Program the gic per-cpu distributor or re-distributor interface */ 114 plat_versal_gic_cpuif_enable(); 115 } 116 117 /** 118 * versal_pwr_domain_off() - This function performs actions to turn off core 119 * 120 * @target_state Targated state 121 */ 122 static void versal_pwr_domain_off(const psci_power_state_t *target_state) 123 { 124 unsigned int cpu_id = plat_my_core_pos(); 125 const struct pm_proc *proc = pm_get_proc(cpu_id); 126 127 for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) 128 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 129 __func__, i, target_state->pwr_domain_state[i]); 130 131 /* Prevent interrupts from spuriously waking up this cpu */ 132 plat_versal_gic_cpuif_disable(); 133 134 /* 135 * Send request to PMC to power down the appropriate APU CPU 136 * core. 137 * According to PSCI specification, CPU_off function does not 138 * have resume address and CPU core can only be woken up 139 * invoking CPU_on function, during which resume address will 140 * be set. 141 */ 142 pm_self_suspend(proc->node_id, MAX_LATENCY, PM_STATE_CPU_IDLE, 0); 143 } 144 145 /** 146 * versal_validate_power_state() - This function ensures that the power state 147 * parameter in request is valid. 148 * 149 * @power_state Power state of core 150 * @req_state Requested state 151 * 152 * @return Returns status, either success or reason 153 */ 154 static int versal_validate_power_state(unsigned int power_state, 155 psci_power_state_t *req_state) 156 { 157 VERBOSE("%s: power_state: 0x%x\n", __func__, power_state); 158 159 int pstate = psci_get_pstate_type(power_state); 160 161 assert(req_state); 162 163 /* Sanity check the requested state */ 164 if (pstate == PSTATE_TYPE_STANDBY) 165 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_RET_STATE; 166 else 167 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_OFF_STATE; 168 169 /* We expect the 'state id' to be zero */ 170 if (psci_get_pstate_id(power_state)) 171 return PSCI_E_INVALID_PARAMS; 172 173 return PSCI_E_SUCCESS; 174 } 175 176 /** 177 * versal_get_sys_suspend_power_state() - Get power state for system suspend 178 * 179 * @req_state Requested state 180 */ 181 static void versal_get_sys_suspend_power_state(psci_power_state_t *req_state) 182 { 183 req_state->pwr_domain_state[PSCI_CPU_PWR_LVL] = PLAT_MAX_OFF_STATE; 184 req_state->pwr_domain_state[1] = PLAT_MAX_OFF_STATE; 185 } 186 187 static const struct plat_psci_ops versal_nopmc_psci_ops = { 188 .pwr_domain_on = versal_pwr_domain_on, 189 .pwr_domain_off = versal_pwr_domain_off, 190 .pwr_domain_on_finish = versal_pwr_domain_on_finish, 191 .pwr_domain_suspend = versal_pwr_domain_suspend, 192 .pwr_domain_suspend_finish = versal_pwr_domain_suspend_finish, 193 .validate_power_state = versal_validate_power_state, 194 .get_sys_suspend_power_state = versal_get_sys_suspend_power_state, 195 }; 196 197 /******************************************************************************* 198 * Export the platform specific power ops. 199 ******************************************************************************/ 200 int plat_setup_psci_ops(uintptr_t sec_entrypoint, 201 const struct plat_psci_ops **psci_ops) 202 { 203 versal_sec_entry = sec_entrypoint; 204 205 *psci_ops = &versal_nopmc_psci_ops; 206 207 return 0; 208 } 209