/*
 * Copyright (c) 2022, Xilinx, Inc. All rights reserved.
 * Copyright (c) 2022, Advanced Micro Devices, Inc. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <assert.h>

#include <common/debug.h>
#include <lib/mmio.h>
#include <lib/psci/psci.h>
#include <plat/arm/common/plat_arm.h>
#include <plat/common/platform.h>
#include <plat_arm.h>

#include <plat_private.h>
#include "pm_api_sys.h"
#include "pm_client.h"
#include <pm_common.h>
#include "pm_svc_main.h"
#include "versal_net_def.h"

static uintptr_t versal_net_sec_entry;

static int32_t versal_net_pwr_domain_on(u_register_t mpidr)
{
	uint32_t cpu_id = plat_core_pos_by_mpidr(mpidr);
	const struct pm_proc *proc;

	VERBOSE("%s: mpidr: 0x%lx, cpuid: %x\n",
		__func__, mpidr, cpu_id);

	if (cpu_id == -1) {
		return PSCI_E_INTERN_FAIL;
	}

	proc = pm_get_proc(cpu_id);
	if (!proc) {
		return PSCI_E_INTERN_FAIL;
	}

	pm_req_wakeup(proc->node_id, (versal_net_sec_entry & 0xFFFFFFFFU) | 0x1U,
		      versal_net_sec_entry >> 32, 0, 0);

	/* Clear power down request */
	pm_client_wakeup(proc);

	return PSCI_E_SUCCESS;
}

/**
 * versal_net_pwr_domain_off() - This function performs actions to turn off core
 *
 * @param target_state	Targeted state
 */
static void versal_net_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 */
	plat_versal_net_gic_cpuif_disable();

	/*
	 * Send request to PMC 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,
			SECURE_FLAG);
}

/**
 * versal_net_system_reset() - This function sends the reset request
 * to firmware for the system to reset.  This function does not return.
 */
static void __dead2 versal_net_system_reset(void)
{
	/* Send the system reset request to the PMC */
	pm_system_shutdown(XPM_SHUTDOWN_TYPE_RESET,
			  pm_get_shutdown_scope(), SECURE_FLAG);

	while (1) {
		wfi();
	}
}

/**
 * versal_net_pwr_domain_suspend() - This function sends request to PMC to suspend
 * core.
 *
 * @param target_state	Targeted state
 */
static void versal_net_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]);
	}

	plat_versal_net_gic_cpuif_disable();

	if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) {
		plat_versal_net_gic_save();
	}

	state = target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE ?
		PM_STATE_SUSPEND_TO_RAM : PM_STATE_CPU_IDLE;

	/* Send request to PMC to suspend this core */
	pm_self_suspend(proc->node_id, MAX_LATENCY, state, versal_net_sec_entry,
			SECURE_FLAG);

	/* TODO: disable coherency */
}

static void versal_net_pwr_domain_on_finish(const psci_power_state_t *target_state)
{
	(void)target_state;

	/* Enable the gic cpu interface */
	plat_versal_net_gic_pcpu_init();

	/* Program the gic per-cpu distributor or re-distributor interface */
	plat_versal_net_gic_cpuif_enable();
}

/**
 * versal_net_pwr_domain_suspend_finish() - This function performs actions to finish
 * suspend procedure.
 *
 * @param target_state	Targeted state
 */
static void versal_net_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);

	/* TODO: enable coherency */

	/* APU was turned off, so restore GIC context */
	if (target_state->pwr_domain_state[1] > PLAT_MAX_RET_STATE) {
		plat_versal_net_gic_resume();
	}

	plat_versal_net_gic_cpuif_enable();
}

/**
 * versal_net_system_off() - This function sends the system off request
 * to firmware.  This function does not return.
 */
static void __dead2 versal_net_system_off(void)
{
	/* Send the power down request to the PMC */
	pm_system_shutdown(XPM_SHUTDOWN_TYPE_SHUTDOWN,
			  pm_get_shutdown_scope(), SECURE_FLAG);

	while (1) {
		wfi();
	}
}

/**
 * versal_net_validate_power_state() - This function ensures that the power state
 * parameter in request is valid.
 *
 * @param power_state		Power state of core
 * @param req_state		Requested state
 *
 * @return Returns status, either PSCI_E_SUCCESS or reason
 */
static int32_t versal_net_validate_power_state(unsigned int power_state,
					       psci_power_state_t *req_state)
{
	VERBOSE("%s: power_state: 0x%x\n", __func__, power_state);

	int32_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;
}

/**
 * versal_net_get_sys_suspend_power_state() - Get power state for system suspend
 *
 * @param req_state	Requested state
 */
static void versal_net_get_sys_suspend_power_state(psci_power_state_t *req_state)
{
	uint64_t i;

	for (i = MPIDR_AFFLVL0; i <= PLAT_MAX_PWR_LVL; i++)
		req_state->pwr_domain_state[i] = PLAT_MAX_OFF_STATE;
}

static const struct plat_psci_ops versal_net_nopmc_psci_ops = {
	.pwr_domain_on                  = versal_net_pwr_domain_on,
	.pwr_domain_off                 = versal_net_pwr_domain_off,
	.pwr_domain_on_finish           = versal_net_pwr_domain_on_finish,
	.pwr_domain_suspend             = versal_net_pwr_domain_suspend,
	.pwr_domain_suspend_finish      = versal_net_pwr_domain_suspend_finish,
	.system_off                     = versal_net_system_off,
	.system_reset                   = versal_net_system_reset,
	.validate_power_state           = versal_net_validate_power_state,
	.get_sys_suspend_power_state    = versal_net_get_sys_suspend_power_state,
};

/*******************************************************************************
 * Export the platform specific power ops.
 ******************************************************************************/
int32_t plat_setup_psci_ops(uintptr_t sec_entrypoint,
			    const struct plat_psci_ops **psci_ops)
{
	versal_net_sec_entry = sec_entrypoint;

	VERBOSE("Setting up entry point %lx\n", versal_net_sec_entry);

	*psci_ops = &versal_net_nopmc_psci_ops;

	return 0;
}

int32_t sip_svc_setup_init(void)
{
	return pm_setup();
}

uint64_t smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3, uint64_t x4,
		     void *cookie, void *handle, uint64_t flags)
{
	return pm_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle, flags);
}