1 /* 2 * Copyright (c) 2018-2021, 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 int32_t versal_pwr_domain_on(u_register_t mpidr) 23 { 24 int32_t 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 33 proc = pm_get_proc((uint32_t)cpu_id); 34 35 /* Send request to PMC to wake up selected ACPU core */ 36 (void)pm_req_wakeup(proc->node_id, (versal_sec_entry & 0xFFFFFFFFU) | 0x1U, 37 versal_sec_entry >> 32, 0, SECURE_FLAG); 38 39 /* Clear power down request */ 40 pm_client_wakeup(proc); 41 42 return PSCI_E_SUCCESS; 43 } 44 45 /** 46 * versal_pwr_domain_suspend() - This function sends request to PMC to suspend 47 * core. 48 * 49 * @target_state Targated state 50 */ 51 static void versal_pwr_domain_suspend(const psci_power_state_t *target_state) 52 { 53 uint32_t state; 54 uint32_t cpu_id = plat_my_core_pos(); 55 const struct pm_proc *proc = pm_get_proc(cpu_id); 56 57 for (size_t i = 0U; i <= PLAT_MAX_PWR_LVL; i++) { 58 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 59 __func__, i, target_state->pwr_domain_state[i]); 60 } 61 62 plat_versal_gic_cpuif_disable(); 63 64 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 65 plat_versal_gic_save(); 66 } 67 68 state = target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE ? 69 PM_STATE_SUSPEND_TO_RAM : PM_STATE_CPU_IDLE; 70 71 /* Send request to PMC to suspend this core */ 72 (void)pm_self_suspend(proc->node_id, MAX_LATENCY, state, versal_sec_entry, 73 SECURE_FLAG); 74 75 /* APU is to be turned off */ 76 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 77 /* disable coherency */ 78 plat_arm_interconnect_exit_coherency(); 79 } 80 } 81 82 /** 83 * versal_pwr_domain_suspend_finish() - This function performs actions to finish 84 * suspend procedure. 85 * 86 * @target_state Targated state 87 */ 88 static void versal_pwr_domain_suspend_finish( 89 const psci_power_state_t *target_state) 90 { 91 uint32_t cpu_id = plat_my_core_pos(); 92 const struct pm_proc *proc = pm_get_proc(cpu_id); 93 94 for (size_t i = 0U; i <= PLAT_MAX_PWR_LVL; i++) { 95 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 96 __func__, i, target_state->pwr_domain_state[i]); 97 } 98 99 /* Clear the APU power control register for this cpu */ 100 pm_client_wakeup(proc); 101 102 /* enable coherency */ 103 plat_arm_interconnect_enter_coherency(); 104 105 /* APU was turned off, so restore GIC context */ 106 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 107 plat_versal_gic_resume(); 108 } 109 110 plat_versal_gic_cpuif_enable(); 111 } 112 113 void versal_pwr_domain_on_finish(const psci_power_state_t *target_state) 114 { 115 /* Enable the gic cpu interface */ 116 plat_versal_gic_pcpu_init(); 117 118 /* Program the gic per-cpu distributor or re-distributor interface */ 119 plat_versal_gic_cpuif_enable(); 120 } 121 122 /** 123 * versal_system_off() - This function sends the system off request 124 * to firmware. This function does not return. 125 */ 126 static void __dead2 versal_system_off(void) 127 { 128 /* Send the power down request to the PMC */ 129 (void)pm_system_shutdown(XPM_SHUTDOWN_TYPE_SHUTDOWN, 130 pm_get_shutdown_scope(), SECURE_FLAG); 131 132 while (1) { 133 wfi(); 134 } 135 } 136 137 /** 138 * versal_system_reset() - This function sends the reset request 139 * to firmware for the system to reset. This function does not return. 140 */ 141 static void __dead2 versal_system_reset(void) 142 { 143 /* Send the system reset request to the PMC */ 144 (void)pm_system_shutdown(XPM_SHUTDOWN_TYPE_RESET, 145 pm_get_shutdown_scope(), SECURE_FLAG); 146 147 while (1) { 148 wfi(); 149 } 150 } 151 152 /** 153 * versal_pwr_domain_off() - This function performs actions to turn off core 154 * 155 * @target_state Targated state 156 */ 157 static void versal_pwr_domain_off(const psci_power_state_t *target_state) 158 { 159 uint32_t cpu_id = plat_my_core_pos(); 160 const struct pm_proc *proc = pm_get_proc(cpu_id); 161 162 for (size_t i = 0U; i <= PLAT_MAX_PWR_LVL; i++) { 163 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 164 __func__, i, target_state->pwr_domain_state[i]); 165 } 166 167 /* Prevent interrupts from spuriously waking up this cpu */ 168 plat_versal_gic_cpuif_disable(); 169 170 /* 171 * Send request to PMC to power down the appropriate APU CPU 172 * core. 173 * According to PSCI specification, CPU_off function does not 174 * have resume address and CPU core can only be woken up 175 * invoking CPU_on function, during which resume address will 176 * be set. 177 */ 178 (void)pm_self_suspend(proc->node_id, MAX_LATENCY, PM_STATE_CPU_IDLE, 0, 179 SECURE_FLAG); 180 } 181 182 /** 183 * versal_validate_power_state() - This function ensures that the power state 184 * parameter in request is valid. 185 * 186 * @power_state Power state of core 187 * @req_state Requested state 188 * 189 * @return Returns status, either success or reason 190 */ 191 static int32_t versal_validate_power_state(uint32_t power_state, 192 psci_power_state_t *req_state) 193 { 194 VERBOSE("%s: power_state: 0x%x\n", __func__, power_state); 195 196 uint32_t pstate = psci_get_pstate_type(power_state); 197 198 assert(req_state); 199 200 /* Sanity check the requested state */ 201 if (pstate == PSTATE_TYPE_STANDBY) { 202 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_RET_STATE; 203 } else { 204 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_OFF_STATE; 205 } 206 207 /* We expect the 'state id' to be zero */ 208 if (psci_get_pstate_id(power_state) != 0U) { 209 return PSCI_E_INVALID_PARAMS; 210 } 211 212 return PSCI_E_SUCCESS; 213 } 214 215 /** 216 * versal_get_sys_suspend_power_state() - Get power state for system suspend 217 * 218 * @req_state Requested state 219 */ 220 static void versal_get_sys_suspend_power_state(psci_power_state_t *req_state) 221 { 222 req_state->pwr_domain_state[PSCI_CPU_PWR_LVL] = PLAT_MAX_OFF_STATE; 223 req_state->pwr_domain_state[1] = PLAT_MAX_OFF_STATE; 224 } 225 226 static const struct plat_psci_ops versal_nopmc_psci_ops = { 227 .pwr_domain_on = versal_pwr_domain_on, 228 .pwr_domain_off = versal_pwr_domain_off, 229 .pwr_domain_on_finish = versal_pwr_domain_on_finish, 230 .pwr_domain_suspend = versal_pwr_domain_suspend, 231 .pwr_domain_suspend_finish = versal_pwr_domain_suspend_finish, 232 .system_off = versal_system_off, 233 .system_reset = versal_system_reset, 234 .validate_power_state = versal_validate_power_state, 235 .get_sys_suspend_power_state = versal_get_sys_suspend_power_state, 236 }; 237 238 /******************************************************************************* 239 * Export the platform specific power ops. 240 ******************************************************************************/ 241 int32_t plat_setup_psci_ops(uintptr_t sec_entrypoint, 242 const struct plat_psci_ops **psci_ops) 243 { 244 versal_sec_entry = sec_entrypoint; 245 246 *psci_ops = &versal_nopmc_psci_ops; 247 248 return 0; 249 } 250