/* SPDX-License-Identifier: BSD-3-Clause */
/**
 * Copyright 2019-2024 NXP
 *
 * KEYWORDS: micro-power uPower driver API
 */

#include <string.h>

#include "upower_api.h"
#include "upower_soc_defs.h"

/* ---------------------------------------------------------------
 * Common Macros
 * ---------------------------------------------------------------
 */

/* tests Service Group busy */
#define UPWR_SG_BUSY(sg) ((sg_busy & (1U << (sg))) == 1U)

/* install user callback for the Service Group */
#define UPWR_USR_CALLB(sg, cb) { user_callback[(sg)] = (cb); }

/* fills up common message header info */
#define UPWR_MSG_HDR(hdr, sg, fn)   {		\
	(hdr).domain   = (uint32_t)pwr_domain;	\
	(hdr).srvgrp   = (sg);			\
	(hdr).function = (fn); }

/* ---------------------------------------------------------------
 * Common Data Structures
 * ---------------------------------------------------------------
 */
static soc_domain_t pwr_domain;

static upwr_code_vers_t fw_rom_version;
static upwr_code_vers_t fw_ram_version;
static uint32_t fw_launch_option;

/* shared memory buffers */
#define UPWR_API_BUFFER_SIZE	(MAX_SG_EXCEPT_MEM_SIZE + \
				 MAX_SG_PWRMGMT_MEM_SIZE + MAX_SG_VOLTM_MEM_SIZE)

/* service group shared mem buffer pointers */
static void *sh_buffer[UPWR_SG_COUNT];

/* Callbacks registered for each service group :
 *
 * NULL means no callback is registered;
 * for sgrp_callback, it also means the service group is
 * free to receive a new request.
 */
static upwr_callb user_callback[UPWR_SG_COUNT];
static UPWR_RX_CALLB_FUNC_T sgrp_callback[UPWR_SG_COUNT];

/* request data structures for each service group */
/* message waiting for TX */
static upwr_down_max_msg  sg_req_msg[UPWR_SG_COUNT];
/* waiting message size */
static unsigned int sg_req_siz[UPWR_SG_COUNT];
/* response msg  */
static upwr_up_max_msg sg_rsp_msg[UPWR_SG_COUNT];
/* response msg size */
static unsigned int sg_rsp_siz[UPWR_SG_COUNT];

/* tx pending status for each (1 bit per service group) */
static volatile uint32_t sg_tx_pend;
/* serv.group of current ongoing Tx, if any */
static volatile upwr_sg_t  sg_tx_curr;

/* service group busy status, only for this domain (MU index 0) */
/* SG bit = 1 if group is busy with a request */
static volatile uint32_t sg_busy;

/* OS-dependent memory allocation function */
static upwr_malloc_ptr_t os_malloc;
/* OS-dependent pointer->physical address conversion function */
static upwr_phyadr_ptr_t os_ptr2phy;
/* OS-dependent function to lock critical code */
static upwr_lock_ptr_t os_lock;

/* pointer to MU structure */
static struct MU_t *mu;

/*
 * indicates that a transmission was done and is pending; this
 * bit is necessary because the Tx and Rx interrupts are ORed
 * together, and there is no way of telling if only Rx interrupt
 * or both occurred just by looking at the MU status registers
 */
static uint32_t  mu_tx_pend;

static UPWR_TX_CALLB_FUNC_T  mu_tx_callb;
static UPWR_RX_CALLB_FUNC_T  mu_rx_callb;

#define	UPWR_API_INIT_WAIT           (0U) /* waiting for ROM firmware initialization */
#define	UPWR_API_INITLZED            (1U) /* ROM firmware initialized */
#define	UPWR_API_START_WAIT          (2U) /* waiting for start services */
#define	UPWR_API_SHUTDOWN_WAIT       (3U) /* waiting for shutdown */
#define	UPWR_API_READY               (4U) /* ready to receive service requests */

volatile upwr_api_state_t api_state;

/* default pointer->physical address conversion, returns the same address */
static void *ptr2phys(const void *ptr)
{
	return (void *)ptr;
}

/* ---------------------------------------------------------------
 * SHARED MEMORY MANAGEMENT
 * --------------------------------------------------------------
 */

/*
 * upwr_ptr2offset() - converts a pointer (casted to uint64_t) to an
 * address offset from the  shared memory start. If it does not point
 * to a shared memory location, the structure pointed is copied to a
 * buffer in the shared memory,  and the buffer offset is returned.
 * The 2nd argument is the service group to which the buffer belongs;
 * The 3rd argument is the size of structure to be copied. The 4th argument
 * is an offset to apply to the copy destination address. The 5th argument
 * is ptr before the conversion to physical address. 2nd, 3rd. 4th and 5th
 * arguments are not used if the 1st one points to a location inside the
 *  shared memory.
 */

static uint32_t upwr_ptr2offset(unsigned long ptr,
				upwr_sg_t sg,
				size_t siz,
				size_t offset,
				const void *vptr)
{
	if ((ptr >= UPWR_DRAM_SHARED_BASE_ADDR) &&
	    ((ptr - UPWR_DRAM_SHARED_BASE_ADDR) < UPWR_DRAM_SHARED_SIZE)) {
		return (uint32_t)(ptr - UPWR_DRAM_SHARED_BASE_ADDR);
	}

	/* pointer is outside the shared memory, copy the struct to buffer */
	(void)memcpy((void *)(offset + (char *)sh_buffer[sg]), (void *)vptr, siz);
	return (uint32_t)((unsigned long)sh_buffer[sg] + offset - UPWR_DRAM_SHARED_BASE_ADDR);
}

/*
 * ---------------------------------------------------------------
 * INTERRUPTS AND CALLBACKS
 * Service-group specific callbacks are in their own sections
 * --------------------------------------------------------------
 */

/*
 * upwr_lock()- locks (lock=1) or unlocks (lock=0) a critical code section;
 * for now it only needs to protect a portion of the code from being
 * interrupted by the MU.
 */
static void upwr_lock(int lock)
{
	if (os_lock != NULL) {
		os_lock(lock);
	}
}

/* upwr_exp_isr()- handles the exception interrupt from uPower */
static void upwr_exp_isr(void)
{
}

/* upwr_copy2tr prototype; function definition in auxiliary function section */
void upwr_copy2tr(struct MU_t *local_mu, const uint32_t *msg, unsigned int size);

#define UPWR_MU_TSR_EMPTY ((uint32_t)((1UL << UPWR_MU_MSG_SIZE) - 1UL))

/* upwr_txrx_isr()- handles both the Tx and Rx MU interrupts */
void upwr_txrx_isr(void)
{
	/* Tx pending and TX register empty */
	if ((mu_tx_pend != 0UL) && (mu->TSR.R == UPWR_MU_TSR_EMPTY)) {
		mu_tx_pend = 0UL;
		/* disable the tx interrupts */
		mu->TCR.R = 0U;
		/* urgency flag off, in case it was set */
		mu->FCR.B.F0 = 0U;

		if (mu_tx_callb != NULL) {
			mu_tx_callb();
		}
	}

	/* RX ISR occurred */
	if (mu->RSR.R != 0UL) {
		/* disable the interrupt until data is read */
		mu->RCR.R = 0U;

		if (mu_rx_callb != NULL) {
			mu_rx_callb();
		}
	}
}

/**
 * upwr_next_req() - sends the next pending service request message, if any.
 *
 * Called upon MU Tx interrupts, it checks if there is any service request
 * pending amongst the service groups, and sends the request if needed.
 *
 * Context: no sleep, no locks taken/released.
 * Return: none (void).
 */
static void upwr_next_req(void)
{
	upwr_sg_t sg = (upwr_sg_t)0U;

	/* no lock needed here, this is called from an MU ISR */
	sg_tx_pend &= ~((uint32_t)1UL << sg_tx_curr); /* no longer pending */

	if (sg_tx_pend == 0U) {
		return; /* no other pending */
	}

	/* find the next one pending */
	for (uint32_t mask = 1UL; mask < (1UL << UPWR_SG_COUNT); mask = mask << 1UL) {
		if ((sg_tx_pend & mask) != 0U) {
			break;
		}

		sg = (upwr_sg_t)(sg + 1U);
	}

	sg_tx_curr = sg;
	if (upwr_tx((uint32_t *)&sg_req_msg[sg], sg_req_siz[sg], upwr_next_req) < 0) {
		return; /* leave the Tx pending */
	}
}

/**
 * upwr_mu_int_callback() - general MU interrupt callback.
 *
 * Called upon MU Rx interrupts, it calls the Service Group-specific callback,
 * if any registered, based on the service group field in the received message.
 * Otherwise, calls the user callback, if any registered.
 *
 * Context: no sleep, no locks taken/released.
 * Return: none (void).
 */
static void upwr_mu_int_callback(void)
{
	upwr_sg_t sg;       /* service group number */
	UPWR_RX_CALLB_FUNC_T sg_callb; /* service group callback */
	upwr_up_max_msg rxmsg = {0};
	unsigned int size; /* in words */

	if (upwr_rx((char *)&rxmsg, &size) < 0) {
		return;
	}

	sg = (upwr_sg_t)rxmsg.hdr.srvgrp;

	/* copy msg to the service group buffer */
	msg_copy((char *)&sg_rsp_msg[sg], (char *)&rxmsg, size);
	sg_rsp_siz[sg] = size;

	/* clear the service group busy status */
	sg_busy &= ~(1UL << sg); /* no lock needed here, we're in the MU ISR */

	sg_callb = sgrp_callback[sg];
	if (sg_callb == NULL) {
		upwr_callb user_callb = user_callback[sg];
		/* no service group callback; call the user callback if any */
		if (user_callb == NULL) {
			goto done; /* no user callback */
		}

		/* make the user callback */
		user_callb(sg, rxmsg.hdr.function,
			   (upwr_resp_t)rxmsg.hdr.errcode,
			   (size == 2U) ? rxmsg.word2 : rxmsg.hdr.ret);
		goto done;
	}

	/*
	 * finally make the group callback. don't uninstall the group
	 * callback, it is permanent.
	 */
	sg_callb();
done:
	if (rxmsg.hdr.errcode == UPWR_RESP_SHUTDOWN) { /* shutdown error: */
		/*
		 * change the API state automatically. so new requests
		 * are rejected by the API immediately
		 */
		api_state = UPWR_API_INITLZED;
	}
}

/**
 * upwr_srv_req() - sends a service request message.
 * @sg: message service group.
 * @msg: pointer to the message
 * @size: message size in 32-bit words.
 *
 * The message is sent right away if possible, or gets pending to be sent later.
 * If pending, the message is stored in sg_req_msg and will be sent when the
 * MU transmission buffer is clear and there are no other pending messages
 * from higher priority service groups.
 *
 * This is an auxiliary function used by the rest of the API calls.
 * It is normally not called by the driver code, unless maybe for test purposes.
 *
 * Context: no sleep, no locks taken/released.
 * Return: none (void)
 */
static void upwr_srv_req(upwr_sg_t sg,
			 uint32_t *msg,
			 unsigned int size)
{
	int rc;

	upwr_lock(1);
	sg_busy |= (uint32_t)1U << sg;
	upwr_lock(0);

	rc = upwr_tx(msg, size, upwr_next_req);
	if (rc  < 0) {
		/* queue full, make the transmission pending */
		msg_copy((char *)&sg_req_msg[sg], (char *)msg, size);
		sg_req_siz[sg] = size;

		upwr_lock(1);
		sg_tx_curr = sg;
		sg_tx_pend |= (uint32_t)1U << sg;
		upwr_lock(0);

		return;
	}
}

/**---------------------------------------------------------------
 * INITIALIZATION, CONFIGURATION
 *
 * A reference uPower initialization sequence goes as follows:
 *
 * 1. host CPU calls upwr_init.
 * 2. (optional) host checks the ROM version and SoC code calling upwr_vers(...)
 *    and optionally performs any configuration or workaround accordingly.
 * 3. host CPU calls upwr_start to start the uPower services, passing a
 *    service option number.
 *    If no RAM code is loaded or it has no service options, the launch option
 *    number passed must be 0, which will start the services available in ROM.
 *    upwr_start also receives a pointer to a callback called by the API
 *    when the firmware is ready to receive service requests.
 *    The callback may be replaced by polling, calling upwr_req_status in a loop
 *    or upwr_poll_req_status; in this case the callback pointer may be NULL.
 *    A host may call upwr_start even if the services were already started by
 *    any host: if the launch option is the same, the response will be ok,
 *    but will indicate error if the services were already started with a
 *    different launch option.
 * 4. host waits for the callback calling, or polling finishing;
 *    if no error is returned, it can start making service calls using the API.
 *
 * Variations on that reference sequence are possible:
 *  - the uPower services can be started using the ROM code only, which includes
 *    the basic Power Management services, among others, with launch option
 *    number = 0.
 *    The code RAM can be loaded while these services are running and,
 *    when the loading is done, the services can be re-started with these 2
 *    requests executed in order: upwr_xcp_shutdown and upwr_start,
 *    using the newly loaded RAM code (launch option > 0).
 *
 * NOTE: the initialization call upwr_init is not effective and
 *       returns error when called after the uPower services are started.
 */

/**
 * upwr_start_callb() - internal callback for the Rx message from uPower
 * that indicates the firmware is ready to receive the start commands.
 * It calls the user callbacks registered in the upwr_start_boot and upwr_start
 * call.
 */
void upwr_start_callb(void)
{
	switch (api_state) {
	case UPWR_API_START_WAIT: {
		upwr_rdy_callb start_callb = (upwr_rdy_callb)user_callback[UPWR_SG_EXCEPT];
		upwr_ready_msg *msg = (upwr_ready_msg *)&sg_rsp_msg[UPWR_SG_EXCEPT];

		fw_ram_version.soc_id = fw_rom_version.soc_id;
		fw_ram_version.vmajor = msg->args.vmajor;
		fw_ram_version.vminor = msg->args.vminor;
		fw_ram_version.vfixes = msg->args.vfixes;

		/*
		 * vmajor == vminor == vfixes == 0 indicates start error
		 * in this case, go back to the INITLZED state
		 */
		if ((fw_ram_version.vmajor != 0U) ||
		    (fw_ram_version.vminor != 0U) ||
		    (fw_ram_version.vfixes != 0U)) {
			api_state = UPWR_API_READY;

			/*
			 * initialization is over:
			 * uninstall the user callback just in case
			 */
			UPWR_USR_CALLB(UPWR_SG_EXCEPT, NULL);

			if (fw_launch_option == 0U) {
				/*
				 * launched ROM firmware:
				 * RAM fw versions must be all 0s
				 */
				fw_ram_version.vmajor = 0U;
				fw_ram_version.vminor = 0U;
				fw_ram_version.vfixes = 0U;
			}
		} else {
			api_state = UPWR_API_INITLZED;
		}

		start_callb(msg->args.vmajor, msg->args.vminor, msg->args.vfixes);
	}
	break;

	case UPWR_API_SHUTDOWN_WAIT: {
		upwr_callb user_callb = (upwr_callb)user_callback[UPWR_SG_EXCEPT];
		upwr_shutdown_msg *msg = (upwr_shutdown_msg *)&sg_rsp_msg[UPWR_SG_EXCEPT];

		if ((upwr_resp_t)msg->hdr.errcode == UPWR_RESP_OK) {
			api_state = UPWR_API_INITLZED;
		}

		if (user_callb != NULL) {
			user_callb(UPWR_SG_EXCEPT, UPWR_XCP_SHUTDOWN,
				   (upwr_resp_t)msg->hdr.errcode, 0U);
		}
	}
	break;

	case UPWR_API_READY:
	{
		upwr_callb user_callb = (upwr_callb)user_callback[UPWR_SG_EXCEPT];
		upwr_up_max_msg *msg = (upwr_up_max_msg *)&sg_rsp_msg[UPWR_SG_EXCEPT];

		if (user_callb != NULL) {
			user_callb(UPWR_SG_EXCEPT, msg->hdr.function,
				   (upwr_resp_t)msg->hdr.errcode,
				   (int)((sg_rsp_siz[UPWR_SG_EXCEPT] == 2U) ?
					 msg->word2 : msg->hdr.ret));
		}
	}
	break;

	default:
		break;
	}
}

/**
 * upwr_init() - API initialization; must be the first API call after reset.
 * @domain: SoC-dependent CPU domain id; identifier used by the firmware in
 * many services. Defined by SoC-dependent type soc_domain_t found in
 * upower_soc_defs.h.
 * @muptr: pointer to the MU instance.
 * @mallocptr: pointer to the memory allocation function
 * @physaddrptr: pointer to the function to convert pointers to
 * physical addresses. If NULL, no conversion is made (pointer=physical address)
 * @isrinstptr: pointer to the function to install the uPower ISR callbacks;
 * the function receives the pointers to the MU tx/rx and Exception ISRs
 * callbacks, which must be called from the actual system ISRs.
 * The function pointed by isrinstptr must also enable the interrupt at the
 * core/interrupt controller, but must not enable the interrupt at the MU IP.
 * The system ISRs are responsible for dealing with the interrupt controller,
 * performing any other context save/restore, and any other housekeeping.
 * @lockptr: pointer to a function that prevents MU interrupts (if argrument=1)
 * or allows it (if argument=0). The API calls this function to make small
 * specific code portions thread safe. Only MU interrupts must be avoided,
 * the code may be suspended for other reasons.
 * If no MU interrupts can happen during the execution of an API call or
 * callback, even if enabled, for some other reason (e.g. interrupt priority),
 * then this argument may be NULL.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if failed to allocate memory, or use some other resource.
 *        -2 if any argument is invalid.
 *        -3 if failed to send the ping message.
 *        -4 if failed to receive the initialization message, or was invalid
 */
int upwr_init(soc_domain_t domain, struct MU_t *muptr,
	      const upwr_malloc_ptr_t mallocptr,
	      const upwr_phyadr_ptr_t phyadrptr,
	      const upwr_inst_isr_ptr_t isrinstptr,
	      const upwr_lock_ptr_t lockptr)
{
	uint32_t j;

	upwr_sg_t sg; /* service group number */
	unsigned int size;
	unsigned long dom_buffer_base = (domain == RTD_DOMAIN) ? UPWR_API_BUFFER_BASE :
					((UPWR_API_BUFFER_ENDPLUS + UPWR_API_BUFFER_BASE) / 2U);

	upwr_init_msg *msg = (upwr_init_msg *)&sg_rsp_msg[UPWR_SG_EXCEPT];

	mu = muptr;
	/*
	 * Disable tx and rx interrupts in case not called
	 * 1st time after reset
	 */
	mu->TCR.R = mu->RCR.R = 0U;

	os_malloc = mallocptr;
	os_ptr2phy = (phyadrptr == (upwr_phyadr_ptr_t)NULL) ? ptr2phys : phyadrptr;

	os_lock = lockptr;
	api_state = UPWR_API_INIT_WAIT;
	sg_busy = 0UL;
	pwr_domain = domain;

	/* initialize the versions, in case they are polled */
	fw_rom_version.soc_id = 0U;
	fw_rom_version.vmajor = 0U;
	fw_rom_version.vminor = 0U;
	fw_rom_version.vfixes = 0U;

	fw_ram_version.soc_id = 0U;
	fw_ram_version.vmajor = 0U;
	fw_ram_version.vminor = 0U;
	fw_ram_version.vfixes = 0U;

	mu_tx_pend = (uint32_t)0U;
	sg_tx_pend = (uint32_t)0U;

	sg_tx_curr = UPWR_SG_COUNT; /* means none here */

	sh_buffer[UPWR_SG_EXCEPT] = (void *)(unsigned long)dom_buffer_base;
	sh_buffer[UPWR_SG_PWRMGMT] = (void *)(unsigned long)(dom_buffer_base +
					      MAX_SG_EXCEPT_MEM_SIZE);
	sh_buffer[UPWR_SG_DELAYM] = NULL;
	sh_buffer[UPWR_SG_VOLTM] = (void *)(unsigned long)(dom_buffer_base +
					    MAX_SG_EXCEPT_MEM_SIZE + MAX_SG_PWRMGMT_MEM_SIZE);
	sh_buffer[UPWR_SG_CURRM] = NULL;
	sh_buffer[UPWR_SG_TEMPM] = NULL;
	sh_buffer[UPWR_SG_DIAG] = NULL;

	/* (no buffers service groups other than xcp and pwm for now) */
	for (j = 0; j < UPWR_SG_COUNT; j++) {
		user_callback[j] = NULL;
		/* service group Exception gets the initialization callbacks */
		sgrp_callback[j] = (j == UPWR_SG_EXCEPT) ? upwr_start_callb : NULL;
		/* response messages with an initial consistent content */
		sg_rsp_msg[j].hdr.errcode = UPWR_RESP_SHUTDOWN;
	}

	/* init message already received, assume takss are running on upower */
	if (mu->FSR.B.F0 != 0U) {
		/* send a ping message down to get the ROM version back */
		upwr_xcp_ping_msg ping_msg = {0};

		ping_msg.hdr.domain = pwr_domain;
		ping_msg.hdr.srvgrp = UPWR_SG_EXCEPT;
		ping_msg.hdr.function = UPWR_XCP_PING;

		if (mu->RSR.B.RF0 != 0U) { /* first clean any Rx message left over */
			(void)upwr_rx((char *)msg, &size);
		}

		/* wait any TX left over to be sent */
		while (mu->TSR.R != UPWR_MU_TSR_EMPTY) {
		}

		/*
		 * now send the ping message;
		 * do not use upwr_tx, which needs API initialized;
		 * just write to the MU TR register(s)
		 */
		mu->FCR.B.F0 = 1U; /* flag urgency status */
		upwr_copy2tr(mu, (uint32_t *)&ping_msg, sizeof(ping_msg) / 4U);
	}

	do {
		/*
		 * poll for the MU Rx status: wait for an init message, either
		 * 1st sent from uPower after reset or as a response to a ping
		 */
		while (mu->RSR.B.RF0 == 0U) {
		}

		/* urgency status off, in case it was set */
		mu->FCR.B.F0 = 0U;

		if (upwr_rx((char *)msg, &size) < 0) {
			return -4;
		}

		if (size != (sizeof(upwr_init_msg) / 4U)) {
			if (mu->FSR.B.F0 != 0U) {
				continue; /* discard left over msg */
			} else {
				return -4;
			}
		}

		sg = (upwr_sg_t)msg->hdr.srvgrp;
		if (sg != UPWR_SG_EXCEPT) {
			if (mu->FSR.B.F0 != 0U) {
				continue; /* discard left over msg */
			} else {
				return -4;
			}
		}

		if ((upwr_xcp_f_t)msg->hdr.function != UPWR_XCP_INIT) {
			if (mu->FSR.B.F0 != 0U) {
				continue; /* discard left over msg */
			} else {
				return -4;
			}
		}

		break;
	} while (true);

	fw_rom_version.soc_id = msg->args.soc;
	fw_rom_version.vmajor = msg->args.vmajor;
	fw_rom_version.vminor = msg->args.vminor;
	fw_rom_version.vfixes = msg->args.vfixes;

	if (upwr_rx_callback(upwr_mu_int_callback) < 0) {
		/* catastrophic error, but is it possible to happen? */
		return -1;
	}

	mu_tx_callb = NULL; /* assigned on upwr_tx */

	/* install the ISRs and enable the interrupts */
	isrinstptr(upwr_txrx_isr, upwr_exp_isr);

	/* enable only RR[0] receive interrupt */
	mu->RCR.R = 1U;

	api_state = UPWR_API_INITLZED;

	return 0;
}

/**
 * upwr_start() - Starts the uPower services.
 * @launchopt: a number to select between multiple launch options,
 * that may define, among other things, which services will be started,
 * or which services implementations, features etc.
 * launchopt = 0 selects a subset of services implemented in ROM;
 * any other number selects service sets implemented in RAM, launched
 * by the firmware function ram_launch; if an invalid launchopt value is passed,
 * no services are started, and the callback returns error (see below).
 * @rdycallb: pointer to the callback to be called when the uPower is ready
 * to receive service requests. NULL if no callback needed.
 * The callback receives as arguments the RAM firmware version numbers.
 * If all 3 numbers (vmajor, vminor, vfixes) are 0, that means the
 * service launching failed.
 * Firmware version numbers will be the same as ROM if launchopt = 0,
 * selecting the ROM services.
 *
 * upwr_start can be called by any domain even if the services are already
 * started: it has no effect, returning success, if the launch option is the
 * same as the one that actually started the service, and returns error if
 * called with a different option.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded or
 * not.
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if a resource failed,
 *        -2 if the domain passed is the same as the caller,
 *        -3 if called in an invalid API state
 */
int upwr_start(uint32_t launchopt, const upwr_rdy_callb rdycallb)
{
	upwr_start_msg txmsg = {0};

	if (api_state != UPWR_API_INITLZED) {
		return -3;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, (upwr_callb)rdycallb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_START);

	txmsg.hdr.arg = fw_launch_option = launchopt;

	if (upwr_tx((uint32_t *)&txmsg, sizeof(txmsg) / 4U, NULL) < 0) {
		/* catastrophic error, but is it possible to happen? */
		return -1;
	}

	api_state = UPWR_API_START_WAIT;

	return 0;
}

/**---------------------------------------------------------------
 * EXCEPTION SERVICE GROUP
 */

/**
 * upwr_xcp_config() - Applies general uPower configurations.
 * @config: pointer to the uPower SoC-dependent configuration struct
 * upwr_xcp_config_t defined in upower_soc_defs.h. NULL may be passed, meaning
 * a request to read the configuration, in which case it appears in the callback
 * argument ret, or can be pointed by argument retptr in the upwr_req_status and
 * upwr_poll_req_status calls, casted to upwr_xcp_config_t.
 * @callb: pointer to the callback to be called when the uPower has finished
 * the configuration, or NULL if no callback needed (polling used instead).
 *
 * Some configurations are targeted for a specific domain (see the struct
 * upwr_xcp_config_t definition in upower_soc_defs.h); this call has implicit
 * domain target (the same domain from which is called).
 *
 * The return value is always the current configuration value, either in a
 * read-only request (config = NULL) or after setting a new configuration
 * (non-NULL config).
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded or
 * not.
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_xcp_config(const upwr_xcp_config_t *config, const upwr_callb callb)
{
	upwr_xcp_config_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	if (config == NULL) {
		txmsg.hdr.arg = 1U;         /* 1= read, txmsg.word2 ignored */
	} else {
		txmsg.hdr.arg = 0U;         /* 1= write */
		txmsg.word2   = config->R;
	}

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_CONFIG);

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_xcp_sw_alarm() - Makes uPower issue an alarm interrupt to given domain.
 * @domain: identifier of the domain to alarm. Defined by SoC-dependent type
 * soc_domain_t found in upower_soc_defs.h.
 * @code: alarm code. Defined by SoC-dependent type upwr_alarm_t found in
 * upower_soc_defs.h.
 * @callb: pointer to the callback to be called when the uPower has finished
 * the alarm, or NULL if no callback needed (polling used instead).
 *
 * The function requests the uPower to issue an alarm of the given code as if
 * it had originated internally. This service is useful mainly to test the
 * system response to such alarms, or to make the system handle a similar alarm
 * situation detected externally to uPower.
 *
 * The system ISR/code handling the alarm may retrieve the alarm code by calling
 * the auxiliary function upwr_alarm_code.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded or
 * not.
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_xcp_sw_alarm(soc_domain_t domain,
		      upwr_alarm_t code,
		      const upwr_callb callb)
{
	upwr_xcp_swalarm_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_SW_ALARM);
	txmsg.hdr.domain = (uint32_t)domain;
	txmsg.hdr.arg = (uint32_t)code;

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_xcp_set_ddr_retention() - M33/A35 can use this API to set/clear ddr retention
 * @domain: identifier of the caller domain.
 * soc_domain_t found in upower_soc_defs.h.
 * @enable: true, means that set ddr retention, false clear ddr retention.
 * @callb: NULL
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_xcp_set_ddr_retention(soc_domain_t domain,
			       uint32_t enable,
			       const upwr_callb callb)
{
	upwr_xcp_ddr_retn_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_SET_DDR_RETN);
	txmsg.hdr.domain = (uint32_t)domain;
	txmsg.hdr.arg = (uint32_t)enable;

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_xcp_set_mipi_dsi_ena() - M33/A35 can use this API to set/clear mipi dsi ena
 * @domain: identifier of the caller domain.
 * soc_domain_t found in upower_soc_defs.h.
 * @enable: true, means that set ddr retention, false clear ddr retention.
 * @callb: NULL
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_xcp_set_mipi_dsi_ena(soc_domain_t domain,
			      uint32_t enable,
			      const upwr_callb callb)
{
	upwr_xcp_set_mipi_dsi_ena_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_SET_MIPI_DSI_ENA);
	txmsg.hdr.domain = (uint32_t)domain;
	txmsg.hdr.arg = (uint32_t)enable;

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_xcp_get_mipi_dsi_ena() - M33/A35 can use this API to get mipi dsi ena status
 * @domain: identifier of the caller domain.
 * soc_domain_t found in upower_soc_defs.h.
 * @callb: NULL
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_xcp_get_mipi_dsi_ena(soc_domain_t domain, const upwr_callb callb)
{
	upwr_xcp_get_mipi_dsi_ena_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_GET_MIPI_DSI_ENA);
	txmsg.hdr.domain = (uint32_t)domain;

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_xcp_set_osc_mode() - M33/A35 can use this API to set uPower OSC mode
 * @domain: identifier of the caller domain.
 * soc_domain_t found in upower_soc_defs.h.
 * @osc_mode, 0 means low frequency, not 0 means high frequency.
 * @callb: NULL
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_xcp_set_osc_mode(soc_domain_t domain,
			  uint32_t osc_mode,
			  const upwr_callb callb)
{
	upwr_xcp_set_osc_mode_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_SET_OSC_MODE);
	txmsg.hdr.domain = (uint32_t)domain;
	txmsg.hdr.arg = (uint32_t)osc_mode;

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_xcp_set_rtd_use_ddr() - M33 call this API to inform uPower, M33 is using ddr
 * @domain: identifier of the caller domain.
 * soc_domain_t found in upower_soc_defs.h.
 * @is_use_ddr: not 0, true, means that RTD is using ddr. 0, false, means that, RTD
 * is not using ddr.
 * @callb: NULL
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_xcp_set_rtd_use_ddr(soc_domain_t domain,
			     uint32_t is_use_ddr,
			     const upwr_callb callb)
{
	upwr_xcp_rtd_use_ddr_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_SET_RTD_USE_DDR);
	txmsg.hdr.domain = (uint32_t)domain;
	txmsg.hdr.arg = (uint32_t)is_use_ddr;

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_xcp_set_rtd_apd_llwu() - M33/A35 can use this API to set/clear rtd_llwu apd_llwu
 * @domain: set which domain (RTD_DOMAIN, APD_DOMAIN) LLWU.
 * soc_domain_t found in upower_soc_defs.h.
 * @enable: true, means that set rtd_llwu or apd_llwu, false clear rtd_llwu or apd_llwu.
 * @callb: NULL
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_xcp_set_rtd_apd_llwu(soc_domain_t domain,
			      uint32_t enable,
			      const upwr_callb callb)
{
	upwr_xcp_rtd_apd_llwu_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_SET_RTD_APD_LLWU);
	txmsg.hdr.domain = (uint32_t)domain;
	txmsg.hdr.arg = (uint32_t)enable;

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_xcp_shutdown() - Shuts down all uPower services and power mode tasks.
 * @callb: pointer to the callback to be called when the uPower has finished
 * the shutdown, or NULL if no callback needed
 * (polling used instead).
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded or
 * not.
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * At the callback the uPower/API is back to initialization/start-up phase,
 * so service request calls return error.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_xcp_shutdown(const upwr_callb callb)
{
	upwr_xcp_shutdown_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_SHUTDOWN);

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	api_state = UPWR_API_SHUTDOWN_WAIT;

	return 0;
}

/**
 * upwr_xcp_i2c_access() - Performs an access through the uPower I2C interface.
 * @addr: I2C slave address, up to 10 bits.
 * @data_size: determines the access direction and data size in bytes, up to 4;
 * negetive data_size determines a read  access with size -data_size;
 * positive data_size determines a write access with size  data_size;
 * data_size=0 is invalid, making the service return error UPWR_RESP_BAD_REQ.
 * @subaddr_size: size of the sub-address in bytes, up to 4; if subaddr_size=0,
 * no subaddress is used.
 * @subaddr: sub-address, only used if subaddr_size > 0.
 * @wdata: write data, up to 4 bytes; ignored if data_size < 0 (read)
 * @callb: pointer to the callback to be called when the uPower has finished
 * the access, or NULL if no callback needed
 * (polling used instead).
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded or
 * not.
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_EXCEPT as the service group argument.
 *
 * The service performs a read (data_size < 0) or a write (data_size > 0) of
 * up to 4 bytes on the uPower I2C interface. The data read from I2C comes via
 * the callback argument ret, or written to the variable pointed by retptr,
 * if polling is used (calls upwr_req_status or upwr_poll_req_status).
 * ret (or *retptr) also returns the data written on writes.
 *
 * Sub-addressing is supported, with sub-address size determined by the argument
 * subaddr_size, up to 4 bytes. Sub-addressing is not used if subaddr_size=0.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */

int upwr_xcp_i2c_access(uint16_t addr,
			int8_t data_size,
			uint8_t subaddr_size,
			uint32_t subaddr,
			uint32_t wdata,
			const upwr_callb callb)
{
	unsigned long ptrval = (unsigned long)sh_buffer[UPWR_SG_EXCEPT];
	upwr_i2c_access *i2c_acc_ptr = (upwr_i2c_access *)ptrval;
	upwr_pwm_pmiccfg_msg  txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_EXCEPT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_EXCEPT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_EXCEPT, UPWR_XCP_I2C);

	i2c_acc_ptr->addr = addr;
	i2c_acc_ptr->subaddr = subaddr;
	i2c_acc_ptr->subaddr_size = subaddr_size;
	i2c_acc_ptr->data = wdata;
	i2c_acc_ptr->data_size = data_size;

	txmsg.ptr = upwr_ptr2offset(ptrval,
				    UPWR_SG_EXCEPT,
				    (size_t)sizeof(upwr_i2c_access),
				    0U,
				    i2c_acc_ptr);

	upwr_srv_req(UPWR_SG_EXCEPT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**---------------------------------------------------------------
 * VOLTAGE MANAGERMENT SERVICE GROUP
 */

/**
 * upwr_vtm_pmic_cold_reset() -request cold reset the pmic.
 * pmic will power cycle all the regulators
 * @callb: response callback pointer; NULL if no callback needed.
 *
 * The function requests uPower to cold reset the pmic.
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_VOLTM as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_vtm_pmic_cold_reset(upwr_callb callb)
{
	upwr_volt_pmic_cold_reset_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_VOLTM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_VOLTM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_VOLTM, UPWR_VTM_PMIC_COLD_RESET);

	upwr_srv_req(UPWR_SG_VOLTM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_vtm_set_pmic_mode() -request uPower set pmic mode
 * @pmic_mode: the target mode need to be set
 * @callb: response callback pointer; NULL if no callback needed.
 *
 * The function requests uPower to set pmic mode
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_VOLTM as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_vtm_set_pmic_mode(uint32_t pmic_mode, upwr_callb callb)
{
	upwr_volt_pmic_set_mode_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_VOLTM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_VOLTM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_VOLTM, UPWR_VTM_SET_PMIC_MODE);

	txmsg.hdr.arg = pmic_mode;

	upwr_srv_req(UPWR_SG_VOLTM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_vtm_chng_pmic_voltage() - Changes the voltage of a given rail.
 * @rail: pmic rail id.
 * @volt: the target voltage of the given rail, accurate to uV
 * If pass volt value 0, means that power off this rail.
 * @callb: response callback pointer; NULL if no callback needed.
 *
 * The function requests uPower to change the voltage of the given rail.
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_VOLTM as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_vtm_chng_pmic_voltage(uint32_t rail, uint32_t volt, upwr_callb callb)
{
	upwr_volt_pmic_set_volt_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_VOLTM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_VOLTM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_VOLTM, UPWR_VTM_CHNG_PMIC_RAIL_VOLT);

	txmsg.args.rail = rail;

	txmsg.args.volt = (volt + PMIC_VOLTAGE_MIN_STEP - 1U) / PMIC_VOLTAGE_MIN_STEP;

	upwr_srv_req(UPWR_SG_VOLTM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_vtm_get_pmic_voltage() - Get the voltage of a given rail.
 * @rail: pmic rail id.
 * @callb: response callback pointer; NULL if no callback needed.
 * (polling used instead)
 *
 * The function requests uPower to get the voltage of the given rail.
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_VOLTM as the service group argument.
 *
 * The voltage data read from uPower via
 * the callback argument ret, or written to the variable pointed by retptr,
 * if polling is used (calls upwr_req_status or upwr_poll_req_status).
 * ret (or *retptr) also returns the data written on writes.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_vtm_get_pmic_voltage(uint32_t rail, upwr_callb callb)
{
	upwr_volt_pmic_get_volt_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_VOLTM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_VOLTM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_VOLTM, UPWR_VTM_GET_PMIC_RAIL_VOLT);

	txmsg.args.rail = rail;

	upwr_srv_req(UPWR_SG_VOLTM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_vtm_power_measure() - request uPower to measure power consumption
 * @ssel: This field determines which power switches will have their currents
 * sampled to be accounted for a
 * current/power measurement. Support 0~7

 * SSEL bit #	Power Switch
 * 0	M33 core complex/platform/peripherals
 * 1	Fusion Core and Peripherals
 * 2	A35[0] core complex
 * 3	A35[1] core complex
 * 4	3DGPU
 * 5	HiFi4
 * 6	DDR Controller (PHY and PLL NOT included)
 * 7	PXP, EPDC
 *
 * @callb: response callback pointer; NULL if no callback needed.
 * (polling used instead)
 *
 * The function requests uPower to measure power consumption
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_VOLTM as the service group argument.
 *
 * The power consumption data read from uPower via
 * the callback argument ret, or written to the variable pointed by retptr,
 * if polling is used (calls upwr_req_status or upwr_poll_req_status).
 * ret (or *retptr) also returns the data written on writes.
 * upower fw needs support cocurrent request from M33 and A35.
 *
 * Accurate to uA
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_vtm_power_measure(uint32_t ssel, upwr_callb callb)
{
	upwr_volt_pmeter_meas_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_VOLTM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_VOLTM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_VOLTM, UPWR_VTM_PMETER_MEAS);

	txmsg.hdr.arg = ssel;

	upwr_srv_req(UPWR_SG_VOLTM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_vtm_vmeter_measure() - request uPower to measure voltage
 * @vdetsel: Voltage Detector Selector, support 0~3
 * 00b - RTD sense point
   01b - LDO output
   10b - APD domain sense point
   11b - AVD domain sense point
   Refer to upower_defs.h
 * @callb: response callback pointer; NULL if no callback needed.
 * (polling used instead)
 *
 * The function requests uPower to use vmeter to measure voltage
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_VOLTM as the service group argument.
 *
 * The voltage data read from uPower via
 * the callback argument ret, or written to the variable pointed by retptr,
 * if polling is used (calls upwr_req_status or upwr_poll_req_status).
 * ret (or *retptr) also returns the data written on writes.
 * upower fw needs support cocurrent request from M33 and A35.
 *
 * Refer to RM COREREGVL (Core Regulator Voltage Level)
 * uPower return VDETLVL to user, user can calculate the real voltage:
 *
0b000000(0x00) - 0.595833V
0b100110(0x26) - 1.007498V
<value> - 0.595833V + <value>x10.8333mV
0b110010(0x32) - 1.138V
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_vtm_vmeter_measure(uint32_t vdetsel, upwr_callb callb)
{
	upwr_volt_vmeter_meas_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_VOLTM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_VOLTM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_VOLTM, UPWR_VTM_VMETER_MEAS);

	txmsg.hdr.arg = vdetsel;

	upwr_srv_req(UPWR_SG_VOLTM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_vtm_pmic_config() - Configures the SoC PMIC (Power Management IC).
 * @config: pointer to a PMIC-dependent struct defining the PMIC configuration.
 * @size:   size of the struct pointed by config, in bytes.
 * @callb: pointer to the callback called when configurations are applied.
 * NULL if no callback is required.
 *
 * The function requests uPower to change/define the PMIC configuration.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok, -1 if service group is busy,
 *        -2 if the pointer conversion to physical address failed,
 *        -3 if called in an invalid API state.
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_vtm_pmic_config(const void *config, uint32_t size, upwr_callb callb)
{
	upwr_pwm_pmiccfg_msg txmsg = {0};
	unsigned long ptrval = 0UL; /* needed for X86, ARM64 */

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_VOLTM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_VOLTM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_VOLTM, UPWR_VTM_PMIC_CONFIG);

	ptrval = (unsigned long)os_ptr2phy(config);
	if (ptrval == 0UL) {
		return -2; /* pointer conversion failed */
	}

	txmsg.ptr = upwr_ptr2offset(ptrval,
				    UPWR_SG_VOLTM,
				    (size_t)size,
				    0U,
				    config);

	upwr_srv_req(UPWR_SG_VOLTM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**---------------------------------------------------------------
 * TEMPERATURE MANAGEMENT SERVICE GROUP
 */

/**
 * upwr_tpm_get_temperature() - request uPower to get temperature of one temperature sensor
 * @sensor_id: temperature sensor ID, support 0~2
 * @callb: response callback pointer; NULL if no callback needed.
 * (polling used instead)
 *
 * The function requests uPower to measure temperature
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_TEMPM as the service group argument.
 *
 * The temperature data read from uPower via
 * the callback argument ret, or written to the variable pointed by retptr,
 * if polling is used (calls upwr_req_status or upwr_poll_req_status).
 * ret (or *retptr) also returns the data written on writes.
 *
 * uPower return TSEL to the caller (M33 or A35), caller calculate the real temperature
 * Tsh = 0.000002673049*TSEL[7:0]^3 + 0.0003734262*TSEL[7:0]^2 +
0.4487042*TSEL[7:0] - 46.98694
 *
 * upower fw needs support cocurrent request from M33 and A35.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_tpm_get_temperature(uint32_t sensor_id, upwr_callb callb)
{
	upwr_temp_get_cur_temp_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_TEMPM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_TEMPM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_TEMPM, UPWR_TEMP_GET_CUR_TEMP);

	txmsg.args.sensor_id = sensor_id;

	upwr_srv_req(UPWR_SG_TEMPM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**---------------------------------------------------------------
 * DELAY MANAGEMENT SERVICE GROUP
 */

/**
 * upwr_dlm_get_delay_margin() - request uPower to get delay margin
 * @path: The critical path
 * @index: Use whitch delay meter
 * @callb: response callback pointer; NULL if no callback needed.
 * (polling used instead)
 *
 * The function requests uPower to get delay margin
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_DELAYM as the service group argument.
 *
 * The delay margin data read from uPower via
 * the callback argument ret, or written to the variable pointed by retptr,
 * if polling is used (calls upwr_req_status or upwr_poll_req_status).
 * ret (or *retptr) also returns the data written on writes.
 * upower fw needs support cocurrent request from M33 and A35.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_dlm_get_delay_margin(uint32_t path, uint32_t index, upwr_callb callb)
{
	upwr_dmeter_get_delay_margin_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_DELAYM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_DELAYM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_DELAYM, UPWR_DMETER_GET_DELAY_MARGIN);

	txmsg.args.path = path;
	txmsg.args.index = index;

	upwr_srv_req(UPWR_SG_DELAYM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_dlm_set_delay_margin() - request uPower to set delay margin
 * @path: The critical path
 * @index: Use whitch delay meter
 * @delay_margin: the value of delay margin
 * @callb: response callback pointer; NULL if no callback needed.
 * (polling used instead)
 *
 * The function requests uPower to set delay margin
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_DELAYM as the service group argument.
 *
 * The result of the corresponding critical path,  failed or not  read from uPower via
 * the callback argument ret, or written to the variable pointed by retptr,
 * if polling is used (calls upwr_req_status or upwr_poll_req_status).
 * ret (or *retptr) also returns the data written on writes.
 * upower fw needs support cocurrent request from M33 and A35.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_dlm_set_delay_margin(uint32_t path, uint32_t index, uint32_t delay_margin,
			      upwr_callb callb)
{
	upwr_dmeter_set_delay_margin_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_DELAYM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_DELAYM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_DELAYM, UPWR_DMETER_SET_DELAY_MARGIN);

	txmsg.args.path = path;
	txmsg.args.index = index;
	txmsg.args.dm = delay_margin;

	upwr_srv_req(UPWR_SG_DELAYM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_dlm_process_monitor() - request uPower to do process monitor
 * @chain_sel: Chain Cell Type Selection
 * Select the chain to be used for the clock signal generation.
 * Support two types chain cell, 0~1
0b - P4 type delay cells selected
1b - P16 type delay cells selected
 * @callb: response callback pointer; NULL if no callback needed.
 * (polling used instead)
 *
 * The function requests uPower to do process monitor
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_DELAYM as the service group argument.
 *
 * The result of process monitor,  failed or not  read from uPower via
 * the callback argument ret, or written to the variable pointed by retptr,
 * if polling is used (calls upwr_req_status or upwr_poll_req_status).
 * ret (or *retptr) also returns the data written on writes.
 * upower fw needs support cocurrent request from M33 and A35.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_dlm_process_monitor(uint32_t chain_sel, upwr_callb callb)
{
	upwr_pmon_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_DELAYM)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_DELAYM, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_DELAYM, UPWR_PMON_REQ);

	txmsg.args.chain_sel = chain_sel;

	upwr_srv_req(UPWR_SG_DELAYM, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**---------------------------------------------------------------
 * POWER MANAGEMENT SERVICE GROUP
 */

/**
 * upwr_pwm_dom_power_on() - Commands uPower to power on the platform of other
 * domain (not necessarily its core(s)); does not release the core reset.
 * @domain: identifier of the domain to power on. Defined by SoC-dependent type
 * soc_domain_t found in upower_soc_defs.h.
 * @boot_start: must be 1 to start the domain core(s) boot(s), releasing
 * its (their) resets, or 0 otherwise.
 * @pwroncallb: pointer to the callback to be called when the uPower has
 * finished the power on procedure, or NULL if no callback needed
 * (polling used instead).
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded or
 * not.
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -2 if the domain passed is the same as the caller,
 *        -3 if called in an invalid API state
 */
int upwr_pwm_dom_power_on(soc_domain_t domain,
			  int boot_start,
			  const upwr_callb pwroncallb)
{
	upwr_pwm_dom_pwron_msg txmsg = {0};

	if (pwr_domain == domain) {
		return -2;
	}

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, (upwr_callb)pwroncallb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_DOM_PWRON);
	txmsg.hdr.domain = (uint32_t)domain;
	txmsg.hdr.arg    = (uint32_t)boot_start;

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_boot_start() - Commands uPower to release the reset of other CPU(s),
 * starting their boots.
 * @domain: identifier of the domain to release the reset. Defined by
 * SoC-dependent type soc_domain_t found in upower_soc_defs.h.
 * @bootcallb: pointer to the callback to be called when the uPower has finished
 * the boot start procedure, or NULL if no callback needed
 * (polling used instead).
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded or
 * not.
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * The callback calling doesn't mean the CPUs boots have finished:
 * it only indicates that uPower released the CPUs resets, and can receive
 * other power management service group requests.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -2 if the domain passed is the same as the caller,
 *        -3 if called in an invalid API state
 */
int upwr_pwm_boot_start(soc_domain_t domain, const upwr_callb  bootcallb)
{
	upwr_pwm_boot_start_msg txmsg = {0};

	if (pwr_domain == domain) {
		return -2;
	}

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, (upwr_callb)bootcallb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_BOOT);
	txmsg.hdr.domain = (uint32_t)domain;

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_param() - Changes Power Management parameters.
 * @param: pointer to a parameter structure upwr_pwm_param_t, SoC-dependent,
 * defined in upwr_soc_defines.h. NULL may be passed, meaning
 * a request to read the parameter set, in which case it appears in the callback
 * argument ret, or can be pointed by argument retptr in the upwr_req_status and
 * upwr_poll_req_status calls, casted to upwr_pwm_param_t.
 * @callb: response callback pointer; NULL if no callback needed.
 *
 * The return value is always the current parameter set value, either in a
 * read-only request (param = NULL) or after setting a new parameter
 * (non-NULL param).
 *
 * Some parameters may be targeted for a specific domain (see the struct
 * upwr_pwm_param_t definition in upower_soc_defs.h); this call has implicit
 * domain target (the same domain from which is called).
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded or
 * not.
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_pwm_param(upwr_pwm_param_t *param, const upwr_callb callb)
{
	upwr_pwm_param_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_PARAM);

	if (param == NULL) {
		txmsg.hdr.arg = 1U;        /* 1= read, txmsg.word2 ignored */
	} else {
		txmsg.hdr.arg = 0U;        /* 1= write */
		txmsg.word2 = param->R; /* just 1 word, so that's ok */
	}

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_chng_reg_voltage() - Changes the voltage at a given regulator.
 * @reg: regulator id.
 * @volt: voltage value; value unit is SoC-dependent, converted from mV by the
 * macro UPWR_VTM_MILIV, or from micro-Volts by the macro UPWR_VTM_MICROV,
 * both macros in upower_soc_defs.h
 * @callb: response callback pointer; NULL if no callback needed.
 *
 * The function requests uPower to change the voltage of the given regulator.
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate voltage value for the given domain process,
 * temperature and frequency.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_pwm_chng_reg_voltage(uint32_t reg, uint32_t volt, upwr_callb callb)
{
	upwr_pwm_volt_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_VOLT);

	txmsg.args.reg = reg;
	txmsg.args.volt = volt;

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_freq_setup() - Determines the next frequency target for a given
 *                         domain and current frequency.
 * @domain: identifier of the domain to change frequency. Defined by
 * SoC-dependent type soc_domain_t found in upower_soc_defs.h.
 * @rail: the pmic regulator number for the target domain.
 * @stage: DVA adjust stage
 * refer to upower_defs.h "DVA adjust stage"
 * @target_freq: the target adjust frequency, accurate to MHz
 *
 * refer to upower_defs.h structure definition upwr_pwm_freq_msg
 *
 * @callb: response callback pointer; NULL if no callback needed.
 *
 * The DVA algorithm is broken down into two phases.
 * The first phase uses a look up table to get a safe operating voltage
 * for the requested frequency.
 * This voltage is guaranteed to work over process and temperature.
 *
 * The second step of the second phase is to measure the temperature
 * using the uPower Temperature Sensor module.
 * This is accomplished by doing a binary search of the TSEL bit field
 * in the Temperature Measurement Register (TMR).
 * The search is repeated until the THIGH bit fields in the same register change value.
 * There are 3 temperature sensors in 8ULP (APD, AVD, and RTD).
 *
 *
 * The second phase is the fine adjust of the voltage.
 * This stage is entered only when the new frequency requested
 * by application was already set as well as the voltage for that frequency.
 * The first step of the fine adjust is to find what is the current margins
 * for the monitored critical paths, or, in other words,
 * how many delay cells will be necessary to generate a setup-timing violation.
 * The function informs uPower that the given domain frequency has changed or
 * will change to the given value. uPower firmware will then adjust voltage and
 * bias to cope with the new frequency (if decreasing) or prepare for it
 * (if increasing). The function must be called after decreasing the frequency,
 * and before increasing it. The actual increase in frequency must not occur
 * before the service returns its response.
 *
 * So, for increase clock frequency case, user need to call this API twice,
 * the first stage gross adjust and the second stage fine adjust.
 *
 * for reduce clock frequency case, user can only call this API once,
 * full stage (combine gross stage and fine adjust)
 *
 * The request is executed if arguments are within range.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_pwm_freq_setup(soc_domain_t domain, uint32_t rail, uint32_t stage, uint32_t target_freq,
			upwr_callb   callb)
{
	upwr_pwm_freq_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_FREQ);

	txmsg.hdr.domain = (uint32_t)domain;
	txmsg.args.rail = rail;
	txmsg.args.stage = stage;
	txmsg.args.target_freq = target_freq;

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_power_on()- Powers on (not off) one or more switches and ROM/RAMs.
 * @swton: pointer to an array of words that tells which power switches to
 *  turn on. Each word in the array has 1 bit for each switch.
 *  A bit=1 means the respective switch must be turned on,
 *  bit = 0 means it will stay unchanged (on or off).
 *  The pointer may be set to NULL, in which case no switch will be changed,
 *  unless a memory that it feeds must be turned on.
 *  WARNING: swton must not point to the first shared memory address.
 * @memon: pointer to an array of words that tells which memories to turn on.
 *  Each word in the array has 1 bit for each switch.
 *  A bit=1 means the respective memory must be turned on, both array and
 *  periphery logic;
 *  bit = 0 means it will stay unchanged (on or off).
 *  The pointer may be set to NULL, in which case no memory will be changed.
 *  WARNING: memon must not point to the first shared memory address.
 * @callb: pointer to the callback called when configurations are applyed.
 * NULL if no callback is required.
 *
 * The function requests uPower to turn on the PMC and memory array/peripheral
 * switches that control their power, as specified above.
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate memory power state related to overall system state.
 *
 * If a memory is requested to turn on, but the power switch that feeds that
 * memory is not, the power switch will be turned on anyway, if the pwron
 * array is not provided (that is, if pwron is NULL).
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Callback or polling may return error if the service contends for a resource
 * already being used by a power mode transition or an ongoing service in
 * another domain.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok, -1 if service group is busy,
 *        -2 if a pointer conversion to physical address failed,
 *        -3 if called in an invalid API state.
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */

int upwr_pwm_power_on(const uint32_t swton[],
		      const uint32_t memon[],
		      upwr_callb     callb)
{
	upwr_pwm_pwron_msg txmsg = {0};
	unsigned long  ptrval = 0UL; /* needed for X86, ARM64 */
	size_t stsize = 0U;

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_PWR_ON);

	ptrval = (unsigned long)os_ptr2phy((void *)swton);
	if (swton == NULL) {
		txmsg.ptrs.ptr0 = 0; /* NULL pointer -> 0 offset */
	} else if (ptrval == 0U) {
		return -2; /* pointer conversion failed */
	} else {
		txmsg.ptrs.ptr0 = upwr_ptr2offset(ptrval,
						  UPWR_SG_PWRMGMT,
						  (stsize = UPWR_PMC_SWT_WORDS * 4U),
						  0U,
						  swton);
	}

	ptrval = (unsigned long)os_ptr2phy((void *)memon);
	if (memon == NULL) {
		txmsg.ptrs.ptr1 = 0; /* NULL pointer -> 0 offset */

	} else if (ptrval == 0U) {
		return -2; /* pointer conversion failed */
	} else {
		txmsg.ptrs.ptr1 = upwr_ptr2offset(ptrval,
						  UPWR_SG_PWRMGMT,
						  UPWR_PMC_MEM_WORDS * 4U,
						  stsize,
						  memon);
	}

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_power_off()- Powers off (not on) one or more switches and ROM/RAMs.
 * @swtoff: pointer to an array of words that tells which power switches to
 *  turn off. Each word in the array has 1 bit for each switch.
 *  A bit=1 means the respective switch must be turned off,
 *  bit = 0 means it will stay unchanged (on or off).
 *  The pointer may be set to NULL, in which case no switch will be changed.
 *  WARNING: swtoff must not point to the first shared memory address.
 * @memoff: pointer to an array of words that tells which memories to turn off.
 *  Each word in the array has 1 bit for each switch.
 *  A bit=1 means the respective memory must be turned off, both array and
 *  periphery logic;
 *  bit = 0 means it will stay unchanged (on or off).
 *  The pointer may be set to NULL, in which case no memory will be changed,
 *  but notice it may be turned off if the switch that feeds it is powered off.
 *  WARNING: memoff must not point to the first shared memory address.
 * @callb: pointer to the callback called when configurations are applyed.
 * NULL if no callback is required.
 *
 * The function requests uPower to turn off the PMC and memory array/peripheral
 * switches that control their power, as specified above.
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate memory power state related to overall system state.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Callback or polling may return error if the service contends for a resource
 * already being used by a power mode transition or an ongoing service in
 * another domain.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok, -1 if service group is busy,
 *        -2 if a pointer conversion to physical address failed,
 *        -3 if called in an invalid API state.
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_pwm_power_off(const uint32_t swtoff[],
		       const uint32_t memoff[],
		       upwr_callb     callb)
{
	upwr_pwm_pwroff_msg txmsg = {0};
	unsigned long ptrval = 0UL; /* needed for X86, ARM64 */
	size_t stsize = 0;

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_PWR_OFF);

	ptrval = (unsigned long)os_ptr2phy((void *)swtoff);
	if (swtoff == NULL) {
		txmsg.ptrs.ptr0 = 0; /* NULL pointer -> 0 offset */
	} else if (ptrval == 0U) {
		return -2; /* pointer conversion failed */
	} else {
		txmsg.ptrs.ptr0 = upwr_ptr2offset(ptrval,
						  UPWR_SG_PWRMGMT,
						  (stsize = UPWR_PMC_SWT_WORDS * 4U),
						  0U,
						  swtoff);
	}

	ptrval = (unsigned long)os_ptr2phy((void *)memoff);
	if (memoff == NULL) {
		txmsg.ptrs.ptr1 = 0; /* NULL pointer -> 0 offset */
	} else if (ptrval == 0U) {
		return -2; /* pointer conversion failed */
	} else {
		txmsg.ptrs.ptr1 = upwr_ptr2offset(ptrval,
						  UPWR_SG_PWRMGMT,
						  UPWR_PMC_MEM_WORDS * 4U,
						  stsize,
						  memoff);
	}

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_mem_retain()- Configures one or more memory power switches to
 * retain its contents, having the power array on, while its peripheral logic
 * is turned off.
 * @mem: pointer to an array of words that tells which memories to put in a
 *  retention state. Each word in the array has 1 bit for each memory.
 *  A bit=1 means the respective memory must be put in retention state,
 *  bit = 0 means it will stay unchanged (retention, fully on or off).
 * @callb: pointer to the callback called when configurations are applyed.
 * NULL if no callback is required.
 *
 * The function requests uPower to turn off the memory peripheral and leave
 * its array on, as specified above.
 * The request is executed if arguments are within range.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Callback or polling may return error if the service contends for a resource
 * already being used by a power mode transition or an ongoing service in
 * another domain.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok, -1 if service group is busy,
 *        -2 if a pointer conversion to physical address failed,
 *        -3 if called in an invalid API state.
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_pwm_mem_retain(const uint32_t mem[], upwr_callb callb)
{
	upwr_pwm_retain_msg txmsg = {0};
	unsigned long ptrval = 0UL; /* needed for X86, ARM64 */

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_RETAIN);

	ptrval = (unsigned long)os_ptr2phy((void *)mem);
	if (ptrval == 0U) {
		return -2; /* pointer conversion failed */
	}

	txmsg.ptr = upwr_ptr2offset(ptrval,
				    UPWR_SG_PWRMGMT,
				    UPWR_PMC_MEM_WORDS * 4U,
				    0U,
				    mem);

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_chng_switch_mem() - Turns on/off power on one or more PMC switches
 * and memories, including their array and peripheral logic.
 * @swt: pointer to a list of PMC switches to be opened/closed.
 *  The list is structured as an array of struct upwr_switch_board_t
 *  (see upower_defs.h), each one containing a word for up to 32 switches,
 *  one per bit. A bit = 1 means switch closed, bit = 0 means switch open.
 *  struct upwr_switch_board_t also specifies a mask with 1 bit for each
 *  respective switch: mask bit = 1 means the open/close action is applied,
 *  mask bit = 0 means the switch stays unchanged.
 *  The pointer may be set to NULL, in which case no switch will be changed,
 *  unless a memory that it feeds must be turned on.
 *  WARNING: swt must not point to the first shared memory address.
 * @mem: pointer to a list of switches to be turned on/off.
 *  The list is structured as an array of struct upwr_mem_switches_t
 *  (see upower_defs.h), each one containing 2 word for up to 32 switches,
 *  one per bit, one word for the RAM array power switch, other for the
 *  RAM peripheral logic power switch. A bit = 1 means switch closed,
 *  bit = 0 means switch open.
 *  struct upwr_mem_switches_t also specifies a mask with 1 bit for each
 *  respective switch: mask bit = 1 means the open/close action is applied,
 *  mask bit = 0 means the switch stays unchanged.
 *  The pointer may be set to NULL, in which case no memory switch will be
 *  changed, but notice it may be turned off if the switch that feeds it is
 *  powered off.
 *  WARNING: mem must not point to the first shared memory address.
 * @callb: pointer to the callback called when the configurations are applied.
 * NULL if no callback is required.
 *
 * The function requests uPower to change the PMC switches and/or memory power
 * as specified above.
 * The request is executed if arguments are within range, with no protections
 * regarding the adequate switch combinations and overall system state.
 *
 * If a memory is requested to turn on, but the power switch that feeds that
 * memory is not, the power switch will be turned on anyway, if the swt
 * array is not provided (that is, if swt is NULL).
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Callback or polling may return error if the service contends for a resource
 * already being used by a power mode transition or an ongoing service in
 * another domain.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok, -1 if service group is busy.
 *        -2 if a pointer conversion to physical address failed,
 *        -3 if called in an invalid API state.
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */

int upwr_pwm_chng_switch_mem(const struct upwr_switch_board_t  swt[],
			     const struct upwr_mem_switches_t  mem[],
			     upwr_callb callb)
{
	upwr_pwm_switch_msg txmsg = {0};
	unsigned long ptrval = 0UL; /* needed for X86, ARM64 */
	size_t stsize = 0U;

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_SWITCH);

	ptrval = (unsigned long)os_ptr2phy((void *)swt);
	if (swt == NULL) {
		txmsg.ptrs.ptr0 = 0; /* NULL pointer -> 0 offset */
	} else if (ptrval == 0U) {
		return -2; /* pointer conversion failed */
	} else {
		txmsg.ptrs.ptr0 = upwr_ptr2offset(ptrval,
						  UPWR_SG_PWRMGMT,
						  (stsize = UPWR_PMC_SWT_WORDS * sizeof(struct upwr_switch_board_t)),
						  0U,
						  swt);
	}

	ptrval = (unsigned long)os_ptr2phy((void *)mem);
	if (mem == NULL) {
		txmsg.ptrs.ptr1 = 0; /* NULL pointer -> 0 offset */
	} else if (ptrval == 0U) {
		return -2; /* pointer conversion failed */
	} else {
		txmsg.ptrs.ptr1 = upwr_ptr2offset(ptrval,
						  UPWR_SG_PWRMGMT,
						  UPWR_PMC_MEM_WORDS * sizeof(struct upwr_mem_switches_t),
						  stsize,
						  mem);
	}

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_pmode_config() - Configures a given power mode in a given domain.
 * @domain: identifier of the domain to which the power mode belongs.
 * Defined by SoC-dependent type soc_domain_t found in upower_soc_defs.h.
 * @pmode: SoC-dependent power mode identifier defined by type abs_pwr_mode_t
 * found in upower_soc_defs.h.
 * @config: pointer to an SoC-dependent struct defining the power mode
 * configuration, found in upower_soc_defs.h.
 * @callb: pointer to the callback called when configurations are applied.
 * NULL if no callback is required.
 *
 * The function requests uPower to change the power mode configuration as
 * specified above. The request is executed if arguments are within range,
 * and complies with SoC-dependent restrictions on value combinations.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok, -1 if service group is busy,
 *        -2 if the pointer conversion to physical address failed,
 *        -3 if called in an invalid API state.
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_pwm_pmode_config(soc_domain_t domain,
			  abs_pwr_mode_t pmode,
			  const void *config,
			  upwr_callb callb)
{
	upwr_pwm_pmode_cfg_msg txmsg = {0};
	unsigned long ptrval = 0UL; /* needed for X86, ARM64 */

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_CONFIG);
	txmsg.hdr.domain = (uint32_t)domain;
	txmsg.hdr.arg = pmode;

	ptrval = (unsigned long)os_ptr2phy(config);
	if (ptrval == 0U) {
		return -2; /* pointer conversion failed */
	}

	/*
	 * upwr_pwm_pmode_config is an exception: use the pointer
	 * (physical addr) as is
	 */

	txmsg.ptr = (uint32_t)ptrval;

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_reg_config() - Configures the uPower internal regulators.
 * @config: pointer to the struct defining the regulator configuration;
 * the struct upwr_reg_config_t is defined in the file upower_defs.h.
 * @callb: pointer to the callback called when configurations are applied.
 * NULL if no callback is required.
 *
 * The function requests uPower to change/define the configurations of the
 * internal regulators.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * The service may fail with error UPWR_RESP_RESOURCE if a power mode transition
 * or the same service (called from another domain) is executing simultaneously.
 * This error should be interpreted as a "try later" response, as the service
 * will succeed once those concurrent executions are done, and no other is
 * started.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok, -1 if service group is busy,
 *        -2 if the pointer conversion to physical address failed,
 *        -3 if called in an invalid API state.
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */

int upwr_pwm_reg_config(const struct upwr_reg_config_t *config,
			upwr_callb   callb)
{
	upwr_pwm_regcfg_msg txmsg = {0};
	unsigned long ptrval = 0UL; /* needed for X86, ARM64 */

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_REGCFG);

	ptrval = (unsigned long)os_ptr2phy(config);
	if (ptrval == 0U) {
		return -2; /* pointer conversion failed */
	}

	txmsg.ptr = upwr_ptr2offset(ptrval,
				    UPWR_SG_PWRMGMT,
				    sizeof(struct upwr_reg_config_t),
				    0U,
				    config);

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_chng_dom_bias() - Changes the domain bias.
 * @bias: pointer to a domain bias configuration struct (see upower_soc_defs.h).
 * @callb: pointer to the callback called when configurations are applied.
 * NULL if no callback is required.
 *
 * The function requests uPower to change the domain bias configuration as
 * specified above. The request is executed if arguments are within range,
 * with no protections regarding the adequate value combinations and
 * overall system state.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok, -1 if service group is busy,
 *        -3 if called in an invalid API state.
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_pwm_chng_dom_bias(const struct upwr_dom_bias_cfg_t *bias,
			   upwr_callb callb)
{
	upwr_pwm_dom_bias_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_DOM_BIAS);

	/* SoC-dependent argument filling, defined in upower_soc_defs.h */
	UPWR_FILL_DOMBIAS_ARGS(txmsg.hdr.domain, bias, txmsg.args);

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**
 * upwr_pwm_chng_mem_bias()- Changes a ROM/RAM power bias.
 * @domain: identifier of the domain upon which the bias is applied.
 * Defined by SoC-dependent type soc_domain_t found in upower_soc_defs.h.
 * @bias: pointer to a memory bias configuration struct (see upower_soc_defs.h).
 * @callb: pointer to the callback called when configurations are applied.
 * NULL if no callback is required.
 *
 * The function requests uPower to change the memory bias configuration as
 * specified above. The request is executed if arguments are within range,
 * with no protections regarding the adequate value combinations and
 * overall system state.
 *
 * A callback can be optionally registered, and will be called upon the arrival
 * of the request response from the uPower firmware, telling if it succeeded
 * or not.
 *
 * A callback may not be registered (NULL pointer), in which case polling has
 * to be used to check the response, by calling upwr_req_status or
 * upwr_poll_req_status, using UPWR_SG_PWRMGMT as the service group argument.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok, -1 if service group is busy,
 *        -3 if called in an invalid API state.
 * Note that this is not the error response from the request itself:
 * it only tells if the request was successfully sent to the uPower.
 */
int upwr_pwm_chng_mem_bias(soc_domain_t domain,
			   const struct upwr_mem_bias_cfg_t *bias,
			   upwr_callb callb)
{
	upwr_pwm_mem_bias_msg txmsg = {0};

	if (api_state != UPWR_API_READY) {
		return -3;
	}

	if (UPWR_SG_BUSY(UPWR_SG_PWRMGMT)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_PWRMGMT, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_PWRMGMT, UPWR_PWM_MEM_BIAS);

	txmsg.hdr.domain = (uint32_t)domain;

	/* SoC-dependent argument filling, defined in upower_soc_defs.h */
	UPWR_FILL_MEMBIAS_ARGS(bias, txmsg.args);

	upwr_srv_req(UPWR_SG_PWRMGMT, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**---------------------------------------------------------------
 * DIAGNOSE SERVICE GROUP
 */

/**
 * upwr_dgn_mode() - Sets the diagnostic mode.
 * @mode:  diagnostic mode, which can be:
 *  - UPWR_DGN_NONE:   no diagnostic recorded
 *  - UPWR_DGN_TRACE:  warnings, errors, service, internal activity recorded
 *  - UPWR_DGN_SRVREQ: warnings, errors, service activity recorded
 *  - UPWR_DGN_WARN:   warnings and errors recorded
 *  - UPWR_DGN_ALL:    trace, service, warnings, errors, task state recorded
 *  - UPWR_DGN_ERROR:  only errors recorded
 *  - UPWR_DGN_ALL2ERR: record all until an error occurs,
 *    freeze recording on error
 *  - UPWR_DGN_ALL2HLT: record all until an error occurs,
 *    executes an ebreak on error, which halts the core if enabled through
 *    the debug interface
 * @callb: pointer to the callback called when mode is changed.
 * NULL if no callback is required.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok,
 *        -1 if service group is busy,
 *        -3 if called in an invalid API state
 */
int upwr_dgn_mode(upwr_dgn_mode_t mode, const upwr_callb callb)
{
	upwr_dgn_mode_msg txmsg = {0};

	if (UPWR_SG_BUSY(UPWR_SG_DIAG)) {
		return -1;
	}

	UPWR_USR_CALLB(UPWR_SG_DIAG, callb);

	UPWR_MSG_HDR(txmsg.hdr, UPWR_SG_DIAG, UPWR_DGN_MODE);

	txmsg.hdr.arg = mode;

	upwr_srv_req(UPWR_SG_DIAG, (uint32_t *)&txmsg, sizeof(txmsg) / 4U);

	return 0;
}

/**---------------------------------------------------------------
 * AUXILIARY CALLS
 */

/**
 * upwr_rom_version() - informs the ROM firwmware version.
 * @vmajor: pointer to the variable to get the firmware major version number.
 * @vminor: pointer to the variable to get the firmware minor version number.
 * @vfixes: pointer to the variable to get the firmware fixes number.
 *
 * Context: no sleep, no locks taken/released.
 * Return: SoC id.
 */
uint32_t upwr_rom_version(uint32_t *vmajor, uint32_t *vminor, uint32_t *vfixes)
{
	uint32_t soc;

	upwr_lock(1);
	soc = fw_rom_version.soc_id;
	*vmajor = fw_rom_version.vmajor;
	*vminor = fw_rom_version.vminor;
	*vfixes = fw_rom_version.vfixes;
	upwr_lock(0);
	return soc;
}

/**
 * upwr_ram_version() - informs the RAM firwmware version.
 * @vminor: pointer to the variable to get the firmware minor version number.
 * @vfixes: pointer to the variable to get the firmware fixes number.
 *
 * The 3 values returned are 0 if no RAM firmwmare was loaded and initialized.
 *
 * Context: no sleep, no locks taken/released.
 * Return: firmware major version number.
 */
uint32_t upwr_ram_version(uint32_t *vminor, uint32_t *vfixes)
{
	uint32_t vmajor;

	upwr_lock(1);
	vmajor = fw_ram_version.vmajor;
	*vminor = fw_ram_version.vminor;
	*vfixes = fw_ram_version.vfixes;
	upwr_lock(0);

	return vmajor;
}

/**
 * upwr_req_status() - tells the status of the service group request, and
 *                     returns a request return value, if any.
 * @sg: service group of the request
 * @sgfptr: pointer to the variable that will hold the function id of
 * the last request completed; can be NULL, in which case it is not used.
 * @errptr: pointer to the variable that will hold the error code;
 * can be NULL, in which case it is not used.
 * @retptr: pointer to the variable that will hold the value returned
 * by the last request completed (invalid if the last request completed didn't
 * return any value); can be NULL, in which case it is not used.
 * Note that a request may return a value even if service error is returned
 * (*errptr != UPWR_RESP_OK): that is dependent on the specific service.
 *
 * This call can be used in a poll loop of a service request completion in case
 * a callback was not registered.
 *
 * Context: no sleep, no locks taken/released.
 * Return: service request status: succeeded, failed, or ongoing (busy)
 */
upwr_req_status_t upwr_req_status(upwr_sg_t sg,
				  uint32_t *sgfptr,
				  upwr_resp_t *errptr,
				  int *retptr)
{
	upwr_req_status_t status;

	upwr_lock(1);
	if (sgfptr != NULL) {
		*sgfptr = (uint32_t)sg_rsp_msg[sg].hdr.function;
	}

	if (errptr != NULL) {
		*errptr = (upwr_resp_t)sg_rsp_msg[sg].hdr.errcode;
	}

	if (retptr != NULL) {
		*retptr = (int)((sg_rsp_siz[sg] == 2U) ?
			  sg_rsp_msg[sg].word2 : sg_rsp_msg[sg].hdr.ret);
	}

	status = ((sg_busy & (1UL << sg)) == 1U) ? UPWR_REQ_BUSY :
		 (sg_rsp_msg[sg].hdr.errcode == UPWR_RESP_OK) ? UPWR_REQ_OK :
								UPWR_REQ_ERR;
	upwr_lock(0);
	return status;
}

/**
 * upwr_poll_req_status() - polls the status of the service group request, and
 *                          returns a request return value, if any.
 * @sg: service group of the request
 * @sgfptr: pointer to the variable that will hold the function id of
 * the last request completed; can be NULL, in which case it is not used.
 * @errptr: pointer to the variable that will hold the error code;
 * can be NULL, in which case it is not used.
 * @retptr: pointer to the variable that will hold the value returned
 * by the last request completed (invalid if the last request completed didn't
 * return any value); can be NULL, in which case it is not used.
 * Note that a request may return a value even if service error is returned
 * (*errptr != UPWR_RESP_OK): that is dependent on the specific service.
 * @attempts: maximum number of polling attempts; if attempts > 0 and is
 * reached with no service response received, upwr_poll_req_status returns
 * UPWR_REQ_BUSY and variables pointed by sgfptr, retptr and errptr are not
 * updated; if attempts = 0, upwr_poll_req_status waits "forever".
 *
 * This call can be used to poll a service request completion in case a
 * callback was not registered.
 *
 * Context: no sleep, no locks taken/released.
 * Return: service request status: succeeded, failed, or ongoing (busy)
 */
upwr_req_status_t upwr_poll_req_status(upwr_sg_t sg,
				       uint32_t *sgfptr,
				       upwr_resp_t *errptr,
				       int *retptr,
				       uint32_t attempts)
{
	uint32_t i;
	upwr_req_status_t ret;

	if (attempts == 0U) {
		while ((ret = upwr_req_status(sg, sgfptr, errptr, retptr)) == UPWR_REQ_BUSY) {
		};

		return ret;
	}

	for (i = 0U; i < attempts; i++) {
		ret = upwr_req_status(sg, sgfptr, errptr, retptr);
		if (ret != UPWR_REQ_BUSY) {
			break;
		}
	}

	return ret;
}

/**
 * upwr_alarm_code() - returns the alarm code of the last alarm occurrence.
 *
 * The value returned is not meaningful if no alarm was issued by uPower.
 *
 * Context: no sleep, no locks taken/released.
 * Return: alarm code, as defined by the type upwr_alarm_t in upwr_soc_defines.h
 */
upwr_alarm_t upwr_alarm_code(void)
{
	return (upwr_alarm_t)(3U & (mu->FSR.R >> 1U)); /* FSR[2:1] */
}

/**---------------------------------------------------------------
 * TRANSMIT/RECEIVE PRIMITIVES
 * ---------------------------------------------------------------
 */

/*
 * upwr_copy2tr() - copies a message to the MU TR registers;
 * fill the TR registers before writing TIEN to avoid early interrupts;
 * also, fill them from the higher index to the lowest, so the receive
 * interrupt flag RF[0] will be the last to set, regardless of message size;
 */
void upwr_copy2tr(struct MU_t *local_mu, const uint32_t *msg, unsigned int size)
{
	for (int i = (int)size - 1; i > -1; i--) {
		local_mu->TR[i].R = msg[i];
	}
}

/**
 * upwr_tx() - queues a message for transmission.
 * @msg : pointer to the message sent.
 * @size: message size in 32-bit words
 * @callback: pointer to a function to be called when transmission done;
 *            can be NULL, in which case no callback is done.
 *
 * This is an auxiliary function used by the rest of the API calls.
 * It is normally not called by the driver code, unless maybe for test purposes.
 *
 * Context: no sleep, no locks taken/released.
 * Return: number of vacant positions left in the transmission queue, or
 *         -1 if the queue was already full when upwr_tx was called, or
 *         -2 if any argument is invalid (like size off-range)
 */
int upwr_tx(const uint32_t *msg,
	    unsigned int size,
	    UPWR_TX_CALLB_FUNC_T callback)
{
	if (size > UPWR_MU_MSG_SIZE) {
		return -2;
	}

	if (size == 0U) {
		return -2;
	}

	if (mu->TSR.R != UPWR_MU_TSR_EMPTY) {
		return -1;  /* not all TE bits in 1: some data to send still */
	}

	mu_tx_callb = callback;

	upwr_copy2tr(mu, msg, size);
	mu->TCR.R = 1UL << (size - 1UL);

	mu_tx_pend = 1UL;

	return 0;
}

/**
 * upwr_rx() - unqueues a received message from the reception queue.
 * @msg: pointer to the message destination buffer.
 * @size: pointer to variable to hold message size in 32-bit words.
 *
 * This is an auxiliary function used by the rest of the API calls.
 * It is normally not called by the driver code, unless maybe for test purposes.
 *
 * Context: no sleep, no locks taken/released.
 * Return: number of messages remaining in the reception queue, or
 *         -1 if the queue was already empty when upwr_rx was called, or
 *         -2 if any argument is invalid (like mu off-range)
 */
int upwr_rx(char *msg, unsigned int *size)
{
	unsigned int len = mu->RSR.R;

	len = (len == 0x0U) ? 0U :
	      (len == 0x1U) ? 1U :
	      #if UPWR_MU_MSG_SIZE > 1
	      (len == 0x3U) ? 2U :
	      #if UPWR_MU_MSG_SIZE > 2
	      (len == 0x7U) ? 3U :
	      #if UPWR_MU_MSG_SIZE > 3
	      (len == 0xFU) ? 4U :
	      #endif
	      #endif
	      #endif
	      0xFFFFFFFFU; /* something wrong */

	if (len  == 0xFFFFFFFFU) {
		return -3;
	}

	if (len == 0U) {
		return -1;
	}

	*size = len;

	/*
	 * copy the received message to the rx queue,
	 * so the interrupts are cleared.
	 */
	msg_copy(msg, (char *)&mu->RR[0], len);

	mu->RCR.R = 1U; /* enable only RR[0] receive interrupt */

	return 0;
}

/**
 * upwr_rx_callback() - sets up a callback for a message receiving event.
 * @callback: pointer to a function to be called when a message arrives;
 *            can be NULL, in which case no callback is done.
 *
 * This is an auxiliary function used by the rest of the API calls.
 * It is normally not called by the driver code, unless maybe for test purposes.
 *
 * Context: no sleep, no locks taken/released.
 * Return: 0 if ok; -2 if any argument is invalid (mu off-range).
 */
int upwr_rx_callback(UPWR_RX_CALLB_FUNC_T callback)
{
	mu_rx_callb = callback;

	return 0;
}

/**
 * msg_copy() - copies a message.
 * @dest: pointer to the destination message.
 * @src : pointer to the source message.
 * @size: message size in words.
 *
 * This is an auxiliary function used by the rest of the API calls.
 * It is normally not called by the driver code, unless maybe for test purposes.
 *
 * Context: no sleep, no locks taken/released.
 * Return: none (void)
 */
void msg_copy(char *dest, char *src, unsigned int size)
{
	for (uint32_t i = 0U; i < size * sizeof(uint32_t); i++) {
		dest[i] = src[i];
	}
}