diff options
Diffstat (limited to 'plat/xilinx/zynqmp/plat_psci.c')
| -rw-r--r-- | plat/xilinx/zynqmp/plat_psci.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/plat/xilinx/zynqmp/plat_psci.c b/plat/xilinx/zynqmp/plat_psci.c new file mode 100644 index 0000000..b7408b1 --- /dev/null +++ b/plat/xilinx/zynqmp/plat_psci.c @@ -0,0 +1,230 @@ +/* + * Copyright (c) 2013-2022, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <errno.h> + +#include <arch_helpers.h> +#include <common/debug.h> +#include <drivers/arm/gicv2.h> +#include <lib/mmio.h> +#include <lib/psci/psci.h> +#include <plat/arm/common/plat_arm.h> +#include <plat/common/platform.h> + +#include <plat_private.h> +#include "pm_api_sys.h" +#include "pm_client.h" + +static uintptr_t zynqmp_sec_entry; + +static void zynqmp_cpu_standby(plat_local_state_t cpu_state) +{ + VERBOSE("%s: cpu_state: 0x%x\n", __func__, cpu_state); + + dsb(); + wfi(); +} + +static int32_t zynqmp_pwr_domain_on(u_register_t mpidr) +{ + uint32_t cpu_id = plat_core_pos_by_mpidr(mpidr); + const struct pm_proc *proc; + uint32_t buff[3]; + enum pm_ret_status ret; + + VERBOSE("%s: mpidr: 0x%lx\n", __func__, mpidr); + + if (cpu_id == -1) { + return PSCI_E_INTERN_FAIL; + } + proc = pm_get_proc(cpu_id); + + /* Check the APU proc status before wakeup */ + ret = pm_get_node_status(proc->node_id, buff); + if ((ret != PM_RET_SUCCESS) || (buff[0] == PM_PROC_STATE_SUSPENDING)) { + return PSCI_E_INTERN_FAIL; + } + + /* Clear power down request */ + pm_client_wakeup(proc); + + /* Send request to PMU to wake up selected APU CPU core */ + pm_req_wakeup(proc->node_id, 1, zynqmp_sec_entry, REQ_ACK_BLOCKING); + + return PSCI_E_SUCCESS; +} + +static void zynqmp_pwr_domain_off(const psci_power_state_t *target_state) +{ + uint32_t cpu_id = plat_my_core_pos(); + const struct pm_proc *proc = pm_get_proc(cpu_id); + + for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) { + VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", + __func__, i, target_state->pwr_domain_state[i]); + } + + /* Prevent interrupts from spuriously waking up this cpu */ + gicv2_cpuif_disable(); + + /* + * Send request to PMU to power down the appropriate APU CPU + * core. + * According to PSCI specification, CPU_off function does not + * have resume address and CPU core can only be woken up + * invoking CPU_on function, during which resume address will + * be set. + */ + pm_self_suspend(proc->node_id, MAX_LATENCY, PM_STATE_CPU_IDLE, 0); +} + +static void zynqmp_pwr_domain_suspend(const psci_power_state_t *target_state) +{ + uint32_t state; + uint32_t cpu_id = plat_my_core_pos(); + const struct pm_proc *proc = pm_get_proc(cpu_id); + + for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) + VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", + __func__, i, target_state->pwr_domain_state[i]); + + state = target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE ? + PM_STATE_SUSPEND_TO_RAM : PM_STATE_CPU_IDLE; + + /* Send request to PMU to suspend this core */ + pm_self_suspend(proc->node_id, MAX_LATENCY, state, zynqmp_sec_entry); + + /* APU is to be turned off */ + if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { + /* disable coherency */ + plat_arm_interconnect_exit_coherency(); + } +} + +static void zynqmp_pwr_domain_on_finish(const psci_power_state_t *target_state) +{ + for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) { + VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", + __func__, i, target_state->pwr_domain_state[i]); + } + plat_arm_gic_pcpu_init(); + gicv2_cpuif_enable(); +} + +static void zynqmp_pwr_domain_suspend_finish(const psci_power_state_t *target_state) +{ + uint32_t cpu_id = plat_my_core_pos(); + const struct pm_proc *proc = pm_get_proc(cpu_id); + + for (size_t i = 0; i <= PLAT_MAX_PWR_LVL; i++) { + VERBOSE("%s: target_state->pwr_domain_state[%lu]=%x\n", + __func__, i, target_state->pwr_domain_state[i]); + } + + /* Clear the APU power control register for this cpu */ + pm_client_wakeup(proc); + + /* enable coherency */ + plat_arm_interconnect_enter_coherency(); + /* APU was turned off */ + if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) { + plat_arm_gic_init(); + } else { + gicv2_cpuif_enable(); + gicv2_pcpu_distif_init(); + } +} + +/******************************************************************************* + * ZynqMP handlers to shutdown/reboot the system + ******************************************************************************/ + +static void __dead2 zynqmp_system_off(void) +{ + /* disable coherency */ + plat_arm_interconnect_exit_coherency(); + + /* Send the power down request to the PMU */ + pm_system_shutdown(PMF_SHUTDOWN_TYPE_SHUTDOWN, + pm_get_shutdown_scope()); + + while (1) { + wfi(); + } +} + +static void __dead2 zynqmp_system_reset(void) +{ + /* disable coherency */ + plat_arm_interconnect_exit_coherency(); + + /* Send the system reset request to the PMU */ + pm_system_shutdown(PMF_SHUTDOWN_TYPE_RESET, + pm_get_shutdown_scope()); + + while (1) { + wfi(); + } +} + +static int32_t zynqmp_validate_power_state(uint32_t power_state, + psci_power_state_t *req_state) +{ + VERBOSE("%s: power_state: 0x%x\n", __func__, power_state); + + uint32_t pstate = psci_get_pstate_type(power_state); + + assert(req_state); + + /* Sanity check the requested state */ + if (pstate == PSTATE_TYPE_STANDBY) { + req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_RET_STATE; + } else { + req_state->pwr_domain_state[MPIDR_AFFLVL0] = PLAT_MAX_OFF_STATE; + } + /* We expect the 'state id' to be zero */ + if (psci_get_pstate_id(power_state)) { + return PSCI_E_INVALID_PARAMS; + } + + return PSCI_E_SUCCESS; +} + +static void zynqmp_get_sys_suspend_power_state(psci_power_state_t *req_state) +{ + req_state->pwr_domain_state[PSCI_CPU_PWR_LVL] = PLAT_MAX_OFF_STATE; + req_state->pwr_domain_state[1] = PLAT_MAX_OFF_STATE; +} + +/******************************************************************************* + * Export the platform handlers to enable psci to invoke them + ******************************************************************************/ +static const struct plat_psci_ops zynqmp_psci_ops = { + .cpu_standby = zynqmp_cpu_standby, + .pwr_domain_on = zynqmp_pwr_domain_on, + .pwr_domain_off = zynqmp_pwr_domain_off, + .pwr_domain_suspend = zynqmp_pwr_domain_suspend, + .pwr_domain_on_finish = zynqmp_pwr_domain_on_finish, + .pwr_domain_suspend_finish = zynqmp_pwr_domain_suspend_finish, + .system_off = zynqmp_system_off, + .system_reset = zynqmp_system_reset, + .validate_power_state = zynqmp_validate_power_state, + .get_sys_suspend_power_state = zynqmp_get_sys_suspend_power_state, +}; + +/******************************************************************************* + * Export the platform specific power ops. + ******************************************************************************/ +int plat_setup_psci_ops(uintptr_t sec_entrypoint, + const struct plat_psci_ops **psci_ops) +{ + zynqmp_sec_entry = sec_entrypoint; + + *psci_ops = &zynqmp_psci_ops; + + return 0; +} |