pm_api_sys.c

/*
 * Copyright (c) 2019, Xilinx, Inc. All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

/*
 * Versal system level PM-API functions and communication with PMC via
 * IPI interrupts
 */

#include <pm_common.h>
#include <pm_ipi.h>
#include <plat/common/platform.h>
#include "pm_api_sys.h"
#include "pm_client.h"

/*********************************************************************
 * Target module IDs macros
 ********************************************************************/
#define LIBPM_MODULE_ID		0x2
#define LOADER_MODULE_ID	0x7

/**
 * Assigning of argument values into array elements.
 */
#define PM_PACK_PAYLOAD1(pl, mid, arg0) {	\
	pl[0] = (uint32_t)((uint32_t)((arg0) & 0xFF) | (mid << 8)); \
}

#define PM_PACK_PAYLOAD2(pl, mid, arg0, arg1) {		\
	pl[1] = (uint32_t)(arg1);			\
	PM_PACK_PAYLOAD1(pl, mid, arg0);		\
}

#define PM_PACK_PAYLOAD3(pl, mid, arg0, arg1, arg2) {	\
	pl[2] = (uint32_t)(arg2);			\
	PM_PACK_PAYLOAD2(pl, mid, arg0, arg1);		\
}

#define PM_PACK_PAYLOAD4(pl, mid, arg0, arg1, arg2, arg3) {	\
	pl[3] = (uint32_t)(arg3);				\
	PM_PACK_PAYLOAD3(pl, mid, arg0, arg1, arg2);		\
}

#define PM_PACK_PAYLOAD5(pl, mid, arg0, arg1, arg2, arg3, arg4) {	\
	pl[4] = (uint32_t)(arg4);					\
	PM_PACK_PAYLOAD4(pl, mid, arg0, arg1, arg2, arg3);		\
}

#define PM_PACK_PAYLOAD6(pl, mid, arg0, arg1, arg2, arg3, arg4, arg5) {	\
	pl[5] = (uint32_t)(arg5);					\
	PM_PACK_PAYLOAD5(pl, mid, arg0, arg1, arg2, arg3, arg4);	\
}

/* PM API functions */

/**
 * pm_get_api_version() - Get version number of PMC PM firmware
 * @version	Returns 32-bit version number of PMC Power Management Firmware
 *
 * @return	Returns status, either success or error+reason
 */
enum pm_ret_status pm_get_api_version(unsigned int *version)
{
	uint32_t payload[PAYLOAD_ARG_CNT];

	/* Send request to the PMC */
	PM_PACK_PAYLOAD1(payload, LIBPM_MODULE_ID, PM_GET_API_VERSION);
	return pm_ipi_send_sync(primary_proc, payload, version, 1);
}

/**
 * pm_self_suspend() - PM call for processor to suspend itself
 * @nid		Node id of the processor or subsystem
 * @latency	Requested maximum wakeup latency (not supported)
 * @state	Requested state
 * @address	Resume address
 *
 * This is a blocking call, it will return only once PMU has responded.
 * On a wakeup, resume address will be automatically set by PMU.
 *
 * @return	Returns status, either success or error+reason
 */
enum pm_ret_status pm_self_suspend(uint32_t nid,
				   unsigned int latency,
				   unsigned int state,
				   uintptr_t address)
{
	uint32_t payload[PAYLOAD_ARG_CNT];
	unsigned int cpuid = plat_my_core_pos();
	const struct pm_proc *proc = pm_get_proc(cpuid);

	if (!proc) {
		WARN("Failed to get proc %d\n", cpuid);
		return PM_RET_ERROR_INTERNAL;
	}

	/*
	 * Do client specific suspend operations
	 * (e.g. set powerdown request bit)
	 */
	pm_client_suspend(proc, state);

	/* Send request to the PLM */
	PM_PACK_PAYLOAD6(payload, LIBPM_MODULE_ID, PM_SELF_SUSPEND,
			 proc->node_id, latency, state, address,
			 (address >> 32));
	return pm_ipi_send_sync(proc, payload, NULL, 0);
}

/**
 * pm_abort_suspend() - PM call to announce that a prior suspend request
 *			is to be aborted.
 * @reason	Reason for the abort
 *
 * Calling PU expects the PMU to abort the initiated suspend procedure.
 * This is a non-blocking call without any acknowledge.
 *
 * @return	Returns status, either success or error+reason
 */
enum pm_ret_status pm_abort_suspend(enum pm_abort_reason reason)
{
	uint32_t payload[PAYLOAD_ARG_CNT];

	/*
	 * Do client specific abort suspend operations
	 * (e.g. enable interrupts and clear powerdown request bit)
	 */
	pm_client_abort_suspend();

	/* Send request to the PLM */
	PM_PACK_PAYLOAD3(payload, LIBPM_MODULE_ID, PM_ABORT_SUSPEND, reason,
			 primary_proc->node_id);
	return pm_ipi_send(primary_proc, payload);
}

/**
 * pm_req_suspend() - PM call to request for another PU or subsystem to
 *		      be suspended gracefully.
 * @target	Node id of the targeted PU or subsystem
 * @ack		Flag to specify whether acknowledge is requested
 * @latency	Requested wakeup latency (not supported)
 * @state	Requested state (not supported)
 *
 * @return	Returns status, either success or error+reason
 */
enum pm_ret_status pm_req_suspend(uint32_t target, uint8_t ack,
				  unsigned int latency, unsigned int state)
{
	uint32_t payload[PAYLOAD_ARG_CNT];

	/* Send request to the PMU */
	PM_PACK_PAYLOAD4(payload, LIBPM_MODULE_ID, PM_REQ_SUSPEND, target,
			 latency, state);
	if (ack == IPI_BLOCKING)
		return pm_ipi_send_sync(primary_proc, payload, NULL, 0);
	else
		return pm_ipi_send(primary_proc, payload);
}