1 /* 2 * Copyright (c) 2018-2021, Arm Limited and Contributors. All rights reserved. 3 * Copyright (c) 2022-2023, Advanced Micro Devices, Inc. All rights reserved. 4 * 5 * SPDX-License-Identifier: BSD-3-Clause 6 */ 7 8 #include <assert.h> 9 #include <plat_arm.h> 10 #include <plat_private.h> 11 #include <pm_common.h> 12 #include <common/debug.h> 13 #include <lib/mmio.h> 14 #include <lib/psci/psci.h> 15 #include <plat/common/platform.h> 16 #include <plat/arm/common/plat_arm.h> 17 18 #include "pm_api_sys.h" 19 #include "pm_client.h" 20 21 static uintptr_t versal_sec_entry; 22 23 static int32_t versal_pwr_domain_on(u_register_t mpidr) 24 { 25 int32_t cpu_id = plat_core_pos_by_mpidr(mpidr); 26 const struct pm_proc *proc; 27 28 VERBOSE("%s: mpidr: 0x%lx\n", __func__, mpidr); 29 30 if (cpu_id == -1) { 31 return PSCI_E_INTERN_FAIL; 32 } 33 34 proc = pm_get_proc((uint32_t)cpu_id); 35 36 /* Send request to PMC to wake up selected ACPU core */ 37 (void)pm_req_wakeup(proc->node_id, (versal_sec_entry & 0xFFFFFFFFU) | 0x1U, 38 versal_sec_entry >> 32, 0, SECURE_FLAG); 39 40 /* Clear power down request */ 41 pm_client_wakeup(proc); 42 43 return PSCI_E_SUCCESS; 44 } 45 46 /** 47 * versal_pwr_domain_suspend() - This function sends request to PMC to suspend 48 * core. 49 * @target_state: Targated state. 50 * 51 */ 52 static void versal_pwr_domain_suspend(const psci_power_state_t *target_state) 53 { 54 uint32_t state; 55 uint32_t cpu_id = plat_my_core_pos(); 56 const struct pm_proc *proc = pm_get_proc(cpu_id); 57 58 for (size_t i = 0U; i <= PLAT_MAX_PWR_LVL; i++) { 59 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 60 __func__, i, target_state->pwr_domain_state[i]); 61 } 62 63 plat_versal_gic_cpuif_disable(); 64 65 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 66 plat_versal_gic_save(); 67 } 68 69 state = target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE ? 70 PM_STATE_SUSPEND_TO_RAM : PM_STATE_CPU_IDLE; 71 72 /* Send request to PMC to suspend this core */ 73 (void)pm_self_suspend(proc->node_id, MAX_LATENCY, state, versal_sec_entry, 74 SECURE_FLAG); 75 76 /* APU is to be turned off */ 77 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 78 /* disable coherency */ 79 plat_arm_interconnect_exit_coherency(); 80 } 81 } 82 83 /** 84 * versal_pwr_domain_suspend_finish() - This function performs actions to finish 85 * suspend procedure. 86 * @target_state: Targated state. 87 * 88 */ 89 static void versal_pwr_domain_suspend_finish( 90 const psci_power_state_t *target_state) 91 { 92 uint32_t cpu_id = plat_my_core_pos(); 93 const struct pm_proc *proc = pm_get_proc(cpu_id); 94 95 for (size_t i = 0U; i <= PLAT_MAX_PWR_LVL; i++) { 96 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 97 __func__, i, target_state->pwr_domain_state[i]); 98 } 99 100 /* Clear the APU power control register for this cpu */ 101 pm_client_wakeup(proc); 102 103 /* enable coherency */ 104 plat_arm_interconnect_enter_coherency(); 105 106 /* APU was turned off, so restore GIC context */ 107 if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { 108 plat_versal_gic_resume(); 109 } 110 111 plat_versal_gic_cpuif_enable(); 112 } 113 114 void versal_pwr_domain_on_finish(const psci_power_state_t *target_state) 115 { 116 /* Enable the gic cpu interface */ 117 plat_versal_gic_pcpu_init(); 118 119 /* Program the gic per-cpu distributor or re-distributor interface */ 120 plat_versal_gic_cpuif_enable(); 121 } 122 123 /** 124 * versal_system_off() - This function sends the system off request to firmware. 125 * This function does not return. 126 * 127 */ 128 static void __dead2 versal_system_off(void) 129 { 130 /* Send the power down request to the PMC */ 131 (void)pm_system_shutdown(XPM_SHUTDOWN_TYPE_SHUTDOWN, 132 pm_get_shutdown_scope(), SECURE_FLAG); 133 134 while (1) { 135 wfi(); 136 } 137 } 138 139 /** 140 * versal_system_reset() - This function sends the reset request to firmware 141 * for the system to reset. This function does not 142 * return. 143 * 144 */ 145 static void __dead2 versal_system_reset(void) 146 { 147 /* Send the system reset request to the PMC */ 148 (void)pm_system_shutdown(XPM_SHUTDOWN_TYPE_RESET, 149 pm_get_shutdown_scope(), SECURE_FLAG); 150 151 while (1) { 152 wfi(); 153 } 154 } 155 156 /** 157 * versal_pwr_domain_off() - This function performs actions to turn off core. 158 * @target_state: Targated state. 159 * 160 */ 161 static void versal_pwr_domain_off(const psci_power_state_t *target_state) 162 { 163 uint32_t cpu_id = plat_my_core_pos(); 164 const struct pm_proc *proc = pm_get_proc(cpu_id); 165 166 for (size_t i = 0U; i <= PLAT_MAX_PWR_LVL; i++) { 167 VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", 168 __func__, i, target_state->pwr_domain_state[i]); 169 } 170 171 /* Prevent interrupts from spuriously waking up this cpu */ 172 plat_versal_gic_cpuif_disable(); 173 174 /* 175 * Send request to PMC to power down the appropriate APU CPU 176 * core. 177 * According to PSCI specification, CPU_off function does not 178 * have resume address and CPU core can only be woken up 179 * invoking CPU_on function, during which resume address will 180 * be set. 181 */ 182 (void)pm_self_suspend(proc->node_id, MAX_LATENCY, PM_STATE_CPU_IDLE, 0, 183 SECURE_FLAG); 184 } 185 186 /** 187 * versal_validate_power_state() - This function ensures that the power state 188 * parameter in request is valid. 189 * @power_state: Power state of core. 190 * @req_state: Requested state. 191 * 192 * Return: Returns status, either success or reason. 193 * 194 */ 195 static int32_t versal_validate_power_state(uint32_t power_state, 196 psci_power_state_t *req_state) 197 { 198 VERBOSE("%s: power_state: 0x%x\n", __func__, power_state); 199 200 uint32_t pstate = psci_get_pstate_type(power_state); 201 202 assert(req_state); 203 204 /* Sanity check the requested state */ 205 if (pstate == PSTATE_TYPE_STANDBY) { 206 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_RET_STATE; 207 } else { 208 req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_OFF_STATE; 209 } 210 211 /* We expect the 'state id' to be zero */ 212 if (psci_get_pstate_id(power_state) != 0U) { 213 return PSCI_E_INVALID_PARAMS; 214 } 215 216 return PSCI_E_SUCCESS; 217 } 218 219 /** 220 * versal_get_sys_suspend_power_state() - Get power state for system suspend. 221 * @req_state: Requested state. 222 * 223 */ 224 static void versal_get_sys_suspend_power_state(psci_power_state_t *req_state) 225 { 226 req_state->pwr_domain_state[PSCI_CPU_PWR_LVL] = PLAT_MAX_OFF_STATE; 227 req_state->pwr_domain_state[1] = PLAT_MAX_OFF_STATE; 228 } 229 230 static const struct plat_psci_ops versal_nopmc_psci_ops = { 231 .pwr_domain_on = versal_pwr_domain_on, 232 .pwr_domain_off = versal_pwr_domain_off, 233 .pwr_domain_on_finish = versal_pwr_domain_on_finish, 234 .pwr_domain_suspend = versal_pwr_domain_suspend, 235 .pwr_domain_suspend_finish = versal_pwr_domain_suspend_finish, 236 .system_off = versal_system_off, 237 .system_reset = versal_system_reset, 238 .validate_power_state = versal_validate_power_state, 239 .get_sys_suspend_power_state = versal_get_sys_suspend_power_state, 240 }; 241 242 /******************************************************************************* 243 * Export the platform specific power ops. 244 ******************************************************************************/ 245 int32_t plat_setup_psci_ops(uintptr_t sec_entrypoint, 246 const struct plat_psci_ops **psci_ops) 247 { 248 versal_sec_entry = sec_entrypoint; 249 250 *psci_ops = &versal_nopmc_psci_ops; 251 252 return 0; 253 } 254