1 /* 2 * Copyright (c) 2018-2020, 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 #include <plat/arm/common/plat_arm.h> 16 17 #include "pm_api_sys.h" 18 #include "pm_client.h" 19 20 static uintptr_t versal_sec_entry; 21 22 static int versal_pwr_domain_on(u_register_t mpidr) 23 { 24 unsigned int cpu_id = plat_core_pos_by_mpidr(mpidr); 25 const struct pm_proc *proc; 26 27 VERBOSE("%s: mpidr: 0x%lx\n", __func__, mpidr); 28 29 if (cpu_id == -1) 30 return PSCI_E_INTERN_FAIL; 31 32 proc = pm_get_proc(cpu_id); 33 34 /* Send request to PMC to wake up selected ACPU core */ 35 pm_req_wakeup(proc->node_id, (versal_sec_entry & 0xFFFFFFFF) | 0x1, 36 versal_sec_entry >> 32, 0, SECURE_FLAG); 37 38 /* Clear power down request */ 39 pm_client_wakeup(proc); 40 41 return PSCI_E_SUCCESS; 42 } 43 44 /** 45 * versal_pwr_domain_suspend() - This function sends request to PMC to suspend 46 * core. 47 * 48 * @target_state Targated state 49 */ 50 static void versal_pwr_domain_suspend(const psci_power_state_t *target_state) 51 { 52 unsigned int state; 53 unsigned int cpu_id = plat_my_core_pos(); 54 const struct pm_proc *proc = pm_get_proc(cpu_id); 55 56 for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) 57 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 58 __func__, i, target_state->pwr_domain_state[i]); 59 60 plat_versal_gic_cpuif_disable(); 61 62 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 63 plat_versal_gic_save(); 64 } 65 66 state = target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE ? 67 PM_STATE_SUSPEND_TO_RAM : PM_STATE_CPU_IDLE; 68 69 /* Send request to PMC to suspend this core */ 70 pm_self_suspend(proc->node_id, MAX_LATENCY, state, versal_sec_entry, 71 SECURE_FLAG); 72 73 /* APU is to be turned off */ 74 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 75 /* disable coherency */ 76 plat_arm_interconnect_exit_coherency(); 77 } 78 } 79 80 /** 81 * versal_pwr_domain_suspend_finish() - This function performs actions to finish 82 * suspend procedure. 83 * 84 * @target_state Targated state 85 */ 86 static void versal_pwr_domain_suspend_finish( 87 const psci_power_state_t *target_state) 88 { 89 unsigned int cpu_id = plat_my_core_pos(); 90 const struct pm_proc *proc = pm_get_proc(cpu_id); 91 92 for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) 93 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 94 __func__, i, target_state->pwr_domain_state[i]); 95 96 /* Clear the APU power control register for this cpu */ 97 pm_client_wakeup(proc); 98 99 /* enable coherency */ 100 plat_arm_interconnect_enter_coherency(); 101 102 /* APU was turned off, so restore GIC context */ 103 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 104 plat_versal_gic_resume(); 105 } 106 107 plat_versal_gic_cpuif_enable(); 108 } 109 110 void versal_pwr_domain_on_finish(const psci_power_state_t *target_state) 111 { 112 /* Enable the gic cpu interface */ 113 plat_versal_gic_pcpu_init(); 114 115 /* Program the gic per-cpu distributor or re-distributor interface */ 116 plat_versal_gic_cpuif_enable(); 117 } 118 119 /** 120 * versal_system_off() - This function sends the system off request 121 * to firmware. This function does not return. 122 */ 123 static void __dead2 versal_system_off(void) 124 { 125 /* Send the power down request to the PMC */ 126 pm_system_shutdown(XPM_SHUTDOWN_TYPE_SHUTDOWN, 127 pm_get_shutdown_scope(), SECURE_FLAG); 128 129 while (1) 130 wfi(); 131 } 132 133 /** 134 * versal_system_reset() - This function sends the reset request 135 * to firmware for the system to reset. This function does not return. 136 */ 137 static void __dead2 versal_system_reset(void) 138 { 139 /* Send the system reset request to the PMC */ 140 pm_system_shutdown(XPM_SHUTDOWN_TYPE_RESET, 141 pm_get_shutdown_scope(), SECURE_FLAG); 142 143 while (1) 144 wfi(); 145 } 146 147 /** 148 * versal_pwr_domain_off() - This function performs actions to turn off core 149 * 150 * @target_state Targated state 151 */ 152 static void versal_pwr_domain_off(const psci_power_state_t *target_state) 153 { 154 unsigned int cpu_id = plat_my_core_pos(); 155 const struct pm_proc *proc = pm_get_proc(cpu_id); 156 157 for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) 158 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 159 __func__, i, target_state->pwr_domain_state[i]); 160 161 /* Prevent interrupts from spuriously waking up this cpu */ 162 plat_versal_gic_cpuif_disable(); 163 164 /* 165 * Send request to PMC to power down the appropriate APU CPU 166 * core. 167 * According to PSCI specification, CPU_off function does not 168 * have resume address and CPU core can only be woken up 169 * invoking CPU_on function, during which resume address will 170 * be set. 171 */ 172 pm_self_suspend(proc->node_id, MAX_LATENCY, PM_STATE_CPU_IDLE, 0, 173 SECURE_FLAG); 174 } 175 176 /** 177 * versal_validate_power_state() - This function ensures that the power state 178 * parameter in request is valid. 179 * 180 * @power_state Power state of core 181 * @req_state Requested state 182 * 183 * @return Returns status, either success or reason 184 */ 185 static int versal_validate_power_state(unsigned int power_state, 186 psci_power_state_t *req_state) 187 { 188 VERBOSE("%s: power_state: 0x%x\n", __func__, power_state); 189 190 int pstate = psci_get_pstate_type(power_state); 191 192 assert(req_state); 193 194 /* Sanity check the requested state */ 195 if (pstate == PSTATE_TYPE_STANDBY) 196 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_RET_STATE; 197 else 198 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_OFF_STATE; 199 200 /* We expect the 'state id' to be zero */ 201 if (psci_get_pstate_id(power_state)) 202 return PSCI_E_INVALID_PARAMS; 203 204 return PSCI_E_SUCCESS; 205 } 206 207 /** 208 * versal_get_sys_suspend_power_state() - Get power state for system suspend 209 * 210 * @req_state Requested state 211 */ 212 static void versal_get_sys_suspend_power_state(psci_power_state_t *req_state) 213 { 214 req_state->pwr_domain_state[PSCI_CPU_PWR_LVL] = PLAT_MAX_OFF_STATE; 215 req_state->pwr_domain_state[1] = PLAT_MAX_OFF_STATE; 216 } 217 218 static const struct plat_psci_ops versal_nopmc_psci_ops = { 219 .pwr_domain_on = versal_pwr_domain_on, 220 .pwr_domain_off = versal_pwr_domain_off, 221 .pwr_domain_on_finish = versal_pwr_domain_on_finish, 222 .pwr_domain_suspend = versal_pwr_domain_suspend, 223 .pwr_domain_suspend_finish = versal_pwr_domain_suspend_finish, 224 .system_off = versal_system_off, 225 .system_reset = versal_system_reset, 226 .validate_power_state = versal_validate_power_state, 227 .get_sys_suspend_power_state = versal_get_sys_suspend_power_state, 228 }; 229 230 /******************************************************************************* 231 * Export the platform specific power ops. 232 ******************************************************************************/ 233 int plat_setup_psci_ops(uintptr_t sec_entrypoint, 234 const struct plat_psci_ops **psci_ops) 235 { 236 versal_sec_entry = sec_entrypoint; 237 238 *psci_ops = &versal_nopmc_psci_ops; 239 240 return 0; 241 } 242