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