drivers/renesas/rcar/iic_dvfs/iic_dvfs.c - tf-a-mtk - Git at Google

 /*
  * Copyright (c) 2015-2019, Renesas Electronics Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */

 #include <common/debug.h>
 #include <lib/mmio.h>

 #include "rcar_def.h"
 #include "cpg_registers.h"
 #include "iic_dvfs.h"
 #include "rcar_private.h"

 #define DVFS_RETRY_MAX				(2U)

 #define IIC_DVFS_SET_ICCL_EXTAL_TYPE_0		(0x07)
 #define IIC_DVFS_SET_ICCL_EXTAL_TYPE_1		(0x09)
 #define IIC_DVFS_SET_ICCL_EXTAL_TYPE_2		(0x0B)
 #define IIC_DVFS_SET_ICCL_EXTAL_TYPE_3		(0x0E)
 #define IIC_DVFS_SET_ICCL_EXTAL_TYPE_E		(0x15)

 #define IIC_DVFS_SET_ICCH_EXTAL_TYPE_0		(0x01)
 #define IIC_DVFS_SET_ICCH_EXTAL_TYPE_1		(0x02)
 #define IIC_DVFS_SET_ICCH_EXTAL_TYPE_2		(0x03)
 #define IIC_DVFS_SET_ICCH_EXTAL_TYPE_3		(0x05)
 #define IIC_DVFS_SET_ICCH_EXTAL_TYPE_E		(0x07)

 #define CPG_BIT_SMSTPCR9_DVFS			(0x04000000)

 #define IIC_DVFS_REG_BASE			(0xE60B0000)
 #define IIC_DVFS_REG_ICDR			(IIC_DVFS_REG_BASE + 0x0000)
 #define IIC_DVFS_REG_ICCR			(IIC_DVFS_REG_BASE + 0x0004)
 #define IIC_DVFS_REG_ICSR			(IIC_DVFS_REG_BASE + 0x0008)
 #define IIC_DVFS_REG_ICIC			(IIC_DVFS_REG_BASE + 0x000C)
 #define IIC_DVFS_REG_ICCL			(IIC_DVFS_REG_BASE + 0x0010)
 #define IIC_DVFS_REG_ICCH			(IIC_DVFS_REG_BASE + 0x0014)

 #define IIC_DVFS_BIT_ICSR_BUSY			(0x10)
 #define IIC_DVFS_BIT_ICSR_AL			(0x08)
 #define IIC_DVFS_BIT_ICSR_TACK			(0x04)
 #define IIC_DVFS_BIT_ICSR_WAIT			(0x02)
 #define IIC_DVFS_BIT_ICSR_DTE			(0x01)

 #define IIC_DVFS_BIT_ICCR_ENABLE		(0x80)
 #define IIC_DVFS_SET_ICCR_START			(0x94)
 #define IIC_DVFS_SET_ICCR_STOP			(0x90)
 #define	IIC_DVFS_SET_ICCR_RETRANSMISSION	(0x94)
 #define	IIC_DVFS_SET_ICCR_CHANGE		(0x81)
 #define	IIC_DVFS_SET_ICCR_STOP_READ		(0xC0)

 #define IIC_DVFS_BIT_ICIC_TACKE			(0x04)
 #define IIC_DVFS_BIT_ICIC_WAITE			(0x02)
 #define IIC_DVFS_BIT_ICIC_DTEE			(0x01)

 #define	DVFS_READ_MODE				(0x01)
 #define	DVFS_WRITE_MODE				(0x00)

 #define IIC_DVFS_SET_DUMMY			(0x52)
 #define IIC_DVFS_SET_BUSY_LOOP			(500000000U)

 typedef enum {
 	DVFS_START = 0,
 	DVFS_STOP,
 	DVFS_RETRANSMIT,
 	DVFS_READ,
 	DVFS_STOP_READ,
 	DVFS_SET_SLAVE_READ,
 	DVFS_SET_SLAVE,
 	DVFS_WRITE_ADDR,
 	DVFS_WRITE_DATA,
 	DVFS_CHANGE_SEND_TO_RECIEVE,
 	DVFS_DONE,
 } DVFS_STATE_T;

 #define DVFS_PROCESS			(1)
 #define DVFS_COMPLETE			(0)
 #define DVFS_ERROR			(-1)

 #if IMAGE_BL31
 #define IIC_DVFS_FUNC(__name, ...)					\
 static int32_t 	__attribute__ ((section (".system_ram")))		\
 dvfs_ ##__name(__VA_ARGS__)

 #define RCAR_DVFS_API(__name, ...)					\
 int32_t __attribute__ ((section (".system_ram"))) 			\
 rcar_iic_dvfs_ ##__name(__VA_ARGS__)

 #else
 #define IIC_DVFS_FUNC(__name, ...) 					\
 static int32_t dvfs_ ##__name(__VA_ARGS__)

 #define RCAR_DVFS_API(__name, ...)					\
 int32_t rcar_iic_dvfs_ ##__name(__VA_ARGS__)
 #endif

 IIC_DVFS_FUNC(check_error, DVFS_STATE_T *state, uint32_t *err, uint8_t mode)
 {
 	uint8_t icsr_al = 0, icsr_tack = 0;
 	uint8_t reg, stop;
 	uint32_t i = 0;

 	stop = mode == DVFS_READ_MODE ? IIC_DVFS_SET_ICCR_STOP_READ :
 	    IIC_DVFS_SET_ICCR_STOP;

 	reg = mmio_read_8(IIC_DVFS_REG_ICSR);
 	icsr_al = (reg & IIC_DVFS_BIT_ICSR_AL) == IIC_DVFS_BIT_ICSR_AL;
 	icsr_tack = (reg & IIC_DVFS_BIT_ICSR_TACK) == IIC_DVFS_BIT_ICSR_TACK;

 	if (icsr_al == 0 && icsr_tack == 0)
 		return DVFS_PROCESS;

 	if (icsr_al) {
 		reg = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_AL;
 		mmio_write_8(IIC_DVFS_REG_ICSR, reg);

 		if (*state == DVFS_SET_SLAVE)
 			mmio_write_8(IIC_DVFS_REG_ICDR, IIC_DVFS_SET_DUMMY);

 		do {
 			reg = mmio_read_8(IIC_DVFS_REG_ICSR) &
 			    IIC_DVFS_BIT_ICSR_WAIT;
 		} while (reg == 0);

 		mmio_write_8(IIC_DVFS_REG_ICCR, stop);

 		reg = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
 		mmio_write_8(IIC_DVFS_REG_ICSR, reg);

 		i = 0;
 		do {
 			reg = mmio_read_8(IIC_DVFS_REG_ICSR) &
 			    IIC_DVFS_BIT_ICSR_BUSY;
 			if (reg == 0)
 				break;

 			if (i++ > IIC_DVFS_SET_BUSY_LOOP)
 				panic();

 		} while (1);

 		mmio_write_8(IIC_DVFS_REG_ICCR, 0x00U);

 		(*err)++;
 		if (*err > DVFS_RETRY_MAX)
 			return DVFS_ERROR;

 		*state = DVFS_START;

 		return DVFS_PROCESS;

 	}

 	/* icsr_tack */
 	mmio_write_8(IIC_DVFS_REG_ICCR, stop);

 	reg = mmio_read_8(IIC_DVFS_REG_ICIC);
 	reg &= ~(IIC_DVFS_BIT_ICIC_WAITE | IIC_DVFS_BIT_ICIC_DTEE);
 	mmio_write_8(IIC_DVFS_REG_ICIC, reg);

 	reg = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_TACK;
 	mmio_write_8(IIC_DVFS_REG_ICSR, reg);

 	i = 0;
 	while ((mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_BUSY) != 0) {
 		if (i++ > IIC_DVFS_SET_BUSY_LOOP)
 			panic();
 	}

 	mmio_write_8(IIC_DVFS_REG_ICCR, 0);
 	(*err)++;

 	if (*err > DVFS_RETRY_MAX)
 		return DVFS_ERROR;

 	*state = DVFS_START;

 	return DVFS_PROCESS;
 }

 IIC_DVFS_FUNC(start, DVFS_STATE_T * state)
 {
 	uint8_t iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_E;
 	uint8_t icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_E;
 	int32_t result = DVFS_PROCESS;
 	uint32_t reg, lsi_product;
 	uint8_t mode;

 	mode = mmio_read_8(IIC_DVFS_REG_ICCR) | IIC_DVFS_BIT_ICCR_ENABLE;
 	mmio_write_8(IIC_DVFS_REG_ICCR, mode);

 	lsi_product = mmio_read_32(RCAR_PRR) & PRR_PRODUCT_MASK;
 	if (lsi_product == PRR_PRODUCT_E3)
 		goto start;

 	reg = mmio_read_32(RCAR_MODEMR) & CHECK_MD13_MD14;
 	switch (reg) {
 	case MD14_MD13_TYPE_0:
 		iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_0;
 		icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_0;
 		break;
 	case MD14_MD13_TYPE_1:
 		iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_1;
 		icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_1;
 		break;
 	case MD14_MD13_TYPE_2:
 		iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_2;
 		icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_2;
 		break;
 	default:
 		iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_3;
 		icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_3;
 		break;
 	}
 start:
 	mmio_write_8(IIC_DVFS_REG_ICCL, iccl);
 	mmio_write_8(IIC_DVFS_REG_ICCH, icch);

 	mode = mmio_read_8(IIC_DVFS_REG_ICIC)
 	    | IIC_DVFS_BIT_ICIC_TACKE
 	    | IIC_DVFS_BIT_ICIC_WAITE | IIC_DVFS_BIT_ICIC_DTEE;

 	mmio_write_8(IIC_DVFS_REG_ICIC, mode);
 	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_START);

 	*state = DVFS_SET_SLAVE;

 	return result;
 }

 IIC_DVFS_FUNC(set_slave, DVFS_STATE_T * state, uint32_t *err, uint8_t slave)
 {
 	uint8_t mode;
 	int32_t result;
 	uint8_t address;

 	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
 	if (result == DVFS_ERROR)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_DTE;
 	if (mode != IIC_DVFS_BIT_ICSR_DTE)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICIC) & ~IIC_DVFS_BIT_ICIC_DTEE;
 	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

 	address = slave << 1;
 	mmio_write_8(IIC_DVFS_REG_ICDR, address);

 	*state = DVFS_WRITE_ADDR;

 	return result;
 }

 IIC_DVFS_FUNC(write_addr, DVFS_STATE_T *state, uint32_t *err, uint8_t reg_addr)
 {
 	uint8_t mode;
 	int32_t result;

 	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
 	if (result == DVFS_ERROR)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
 	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
 		return result;

 	mmio_write_8(IIC_DVFS_REG_ICDR, reg_addr);

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
 	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

 	*state = DVFS_WRITE_DATA;

 	return result;
 }

 IIC_DVFS_FUNC(write_data, DVFS_STATE_T *state, uint32_t *err, uint8_t reg_data)
 {
 	int32_t result;
 	uint8_t mode;

 	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
 	if (result == DVFS_ERROR)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
 	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
 		return result;

 	mmio_write_8(IIC_DVFS_REG_ICDR, reg_data);

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
 	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

 	*state = DVFS_STOP;

 	return result;
 }

 IIC_DVFS_FUNC(stop, DVFS_STATE_T *state, uint32_t *err)
 {
 	int32_t result;
 	uint8_t mode;

 	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
 	if (result == DVFS_ERROR)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
 	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
 		return result;

 	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_STOP);

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
 	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

 	*state = DVFS_DONE;

 	return result;
 }

 IIC_DVFS_FUNC(done, void)
 {
 	uint32_t i;

 	for (i = 0; i < IIC_DVFS_SET_BUSY_LOOP; i++) {
 		if (mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_BUSY)
 			continue;
 		goto done;
 	}

 	panic();
 done:
 	mmio_write_8(IIC_DVFS_REG_ICCR, 0);

 	return DVFS_COMPLETE;
 }

 IIC_DVFS_FUNC(write_reg_addr_read, DVFS_STATE_T *state, uint32_t *err,
 	uint8_t reg_addr)
 {
 	int32_t result;
 	uint8_t mode;

 	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
 	if (result == DVFS_ERROR)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
 	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
 		return result;

 	mmio_write_8(IIC_DVFS_REG_ICDR, reg_addr);

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
 	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

 	*state = DVFS_RETRANSMIT;

 	return result;
 }

 IIC_DVFS_FUNC(retransmit, DVFS_STATE_T *state, uint32_t *err)
 {
 	int32_t result;
 	uint8_t mode;

 	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
 	if (result == DVFS_ERROR)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
 	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
 		return result;

 	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_RETRANSMISSION);

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
 	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

 	mode = mmio_read_8(IIC_DVFS_REG_ICIC) | IIC_DVFS_BIT_ICIC_DTEE;
 	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

 	*state = DVFS_SET_SLAVE_READ;

 	return result;
 }

 IIC_DVFS_FUNC(set_slave_read, DVFS_STATE_T *state, uint32_t *err,
 		uint8_t slave)
 {
 	uint8_t address;
 	int32_t result;
 	uint8_t mode;

 	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
 	if (result == DVFS_ERROR)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_DTE;
 	if (mode != IIC_DVFS_BIT_ICSR_DTE)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICIC) & ~IIC_DVFS_BIT_ICIC_DTEE;
 	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

 	address = ((uint8_t) (slave << 1) + DVFS_READ_MODE);
 	mmio_write_8(IIC_DVFS_REG_ICDR, address);

 	*state = DVFS_CHANGE_SEND_TO_RECIEVE;

 	return result;
 }

 IIC_DVFS_FUNC(change_send_to_recieve, DVFS_STATE_T *state, uint32_t *err)
 {
 	int32_t result;
 	uint8_t mode;

 	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
 	if (result == DVFS_ERROR)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
 	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
 		return result;

 	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_CHANGE);

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
 	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

 	*state = DVFS_STOP_READ;

 	return result;
 }

 IIC_DVFS_FUNC(stop_read, DVFS_STATE_T *state, uint32_t *err)
 {
 	int32_t result;
 	uint8_t mode;

 	result = dvfs_check_error(state, err, DVFS_READ_MODE);
 	if (result == DVFS_ERROR)
 		return result;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
 	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
 		return result;

 	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_STOP_READ);

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
 	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

 	mode = mmio_read_8(IIC_DVFS_REG_ICIC) | IIC_DVFS_BIT_ICIC_DTEE;
 	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

 	*state = DVFS_READ;

 	return result;
 }

 IIC_DVFS_FUNC(read, DVFS_STATE_T *state, uint8_t *reg_data)
 {
 	uint8_t mode;

 	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_DTE;
 	if (mode != IIC_DVFS_BIT_ICSR_DTE)
 		return DVFS_PROCESS;

 	mode = mmio_read_8(IIC_DVFS_REG_ICIC) & ~IIC_DVFS_BIT_ICIC_DTEE;
 	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

 	*reg_data = mmio_read_8(IIC_DVFS_REG_ICDR);
 	*state = DVFS_DONE;

 	return DVFS_PROCESS;
 }

 RCAR_DVFS_API(send, uint8_t slave, uint8_t reg_addr, uint8_t reg_data)
 {
 	DVFS_STATE_T state = DVFS_START;
 	int32_t result = DVFS_PROCESS;
 	uint32_t err = 0;

 	mstpcr_write(SCMSTPCR9, CPG_MSTPSR9, CPG_BIT_SMSTPCR9_DVFS);
 	mmio_write_8(IIC_DVFS_REG_ICCR, 0);
 again:
 	switch (state) {
 	case DVFS_START:
 		result = dvfs_start(&state);
 		break;
 	case DVFS_SET_SLAVE:
 		result = dvfs_set_slave(&state, &err, slave);
 		break;
 	case DVFS_WRITE_ADDR:
 		result = dvfs_write_addr(&state, &err, reg_addr);
 		break;
 	case DVFS_WRITE_DATA:
 		result = dvfs_write_data(&state, &err, reg_data);
 		break;
 	case DVFS_STOP:
 		result = dvfs_stop(&state, &err);
 		break;
 	case DVFS_DONE:
 		result = dvfs_done();
 		break;
 	default:
 		panic();
 		break;
 	}

 	if (result == DVFS_PROCESS)
 		goto again;

 	return result;
 }

 RCAR_DVFS_API(receive, uint8_t slave, uint8_t reg, uint8_t *data)
 {
 	DVFS_STATE_T state = DVFS_START;
 	int32_t result = DVFS_PROCESS;
 	uint32_t err = 0;

 	mstpcr_write(SCMSTPCR9, CPG_MSTPSR9, CPG_BIT_SMSTPCR9_DVFS);
 	mmio_write_8(IIC_DVFS_REG_ICCR, 0);
 again:
 	switch (state) {
 	case DVFS_START:
 		result = dvfs_start(&state);
 		break;
 	case DVFS_SET_SLAVE:
 		result = dvfs_set_slave(&state, &err, slave);
 		break;
 	case DVFS_WRITE_ADDR:
 		result = dvfs_write_reg_addr_read(&state, &err, reg);
 		break;
 	case DVFS_RETRANSMIT:
 		result = dvfs_retransmit(&state, &err);
 		break;
 	case DVFS_SET_SLAVE_READ:
 		result = dvfs_set_slave_read(&state, &err, slave);
 		break;
 	case DVFS_CHANGE_SEND_TO_RECIEVE:
 		result = dvfs_change_send_to_recieve(&state, &err);
 		break;
 	case DVFS_STOP_READ:
 		result = dvfs_stop_read(&state, &err);
 		break;
 	case DVFS_READ:
 		result = dvfs_read(&state, data);
 		break;
 	case DVFS_DONE:
 		result = dvfs_done();
 		break;
 	default:
 		panic();
 		break;
 	}

 	if (result == DVFS_PROCESS)
 		goto again;

 	return result;
 }
	/*
	* Copyright (c) 2015-2019, Renesas Electronics Corporation. All rights reserved.
	*
	* SPDX-License-Identifier: BSD-3-Clause
	*/

	#include <common/debug.h>
	#include <lib/mmio.h>

	#include "rcar_def.h"
	#include "cpg_registers.h"
	#include "iic_dvfs.h"
	#include "rcar_private.h"

	#define DVFS_RETRY_MAX (2U)

	#define IIC_DVFS_SET_ICCL_EXTAL_TYPE_0 (0x07)
	#define IIC_DVFS_SET_ICCL_EXTAL_TYPE_1 (0x09)
	#define IIC_DVFS_SET_ICCL_EXTAL_TYPE_2 (0x0B)
	#define IIC_DVFS_SET_ICCL_EXTAL_TYPE_3 (0x0E)
	#define IIC_DVFS_SET_ICCL_EXTAL_TYPE_E (0x15)

	#define IIC_DVFS_SET_ICCH_EXTAL_TYPE_0 (0x01)
	#define IIC_DVFS_SET_ICCH_EXTAL_TYPE_1 (0x02)
	#define IIC_DVFS_SET_ICCH_EXTAL_TYPE_2 (0x03)
	#define IIC_DVFS_SET_ICCH_EXTAL_TYPE_3 (0x05)
	#define IIC_DVFS_SET_ICCH_EXTAL_TYPE_E (0x07)

	#define CPG_BIT_SMSTPCR9_DVFS (0x04000000)

	#define IIC_DVFS_REG_BASE (0xE60B0000)
	#define IIC_DVFS_REG_ICDR (IIC_DVFS_REG_BASE + 0x0000)
	#define IIC_DVFS_REG_ICCR (IIC_DVFS_REG_BASE + 0x0004)
	#define IIC_DVFS_REG_ICSR (IIC_DVFS_REG_BASE + 0x0008)
	#define IIC_DVFS_REG_ICIC (IIC_DVFS_REG_BASE + 0x000C)
	#define IIC_DVFS_REG_ICCL (IIC_DVFS_REG_BASE + 0x0010)
	#define IIC_DVFS_REG_ICCH (IIC_DVFS_REG_BASE + 0x0014)

	#define IIC_DVFS_BIT_ICSR_BUSY (0x10)
	#define IIC_DVFS_BIT_ICSR_AL (0x08)
	#define IIC_DVFS_BIT_ICSR_TACK (0x04)
	#define IIC_DVFS_BIT_ICSR_WAIT (0x02)
	#define IIC_DVFS_BIT_ICSR_DTE (0x01)

	#define IIC_DVFS_BIT_ICCR_ENABLE (0x80)
	#define IIC_DVFS_SET_ICCR_START (0x94)
	#define IIC_DVFS_SET_ICCR_STOP (0x90)
	#define IIC_DVFS_SET_ICCR_RETRANSMISSION (0x94)
	#define IIC_DVFS_SET_ICCR_CHANGE (0x81)
	#define IIC_DVFS_SET_ICCR_STOP_READ (0xC0)

	#define IIC_DVFS_BIT_ICIC_TACKE (0x04)
	#define IIC_DVFS_BIT_ICIC_WAITE (0x02)
	#define IIC_DVFS_BIT_ICIC_DTEE (0x01)

	#define DVFS_READ_MODE (0x01)
	#define DVFS_WRITE_MODE (0x00)

	#define IIC_DVFS_SET_DUMMY (0x52)
	#define IIC_DVFS_SET_BUSY_LOOP (500000000U)

	typedef enum {
	DVFS_START = 0,
	DVFS_STOP,
	DVFS_RETRANSMIT,
	DVFS_READ,
	DVFS_STOP_READ,
	DVFS_SET_SLAVE_READ,
	DVFS_SET_SLAVE,
	DVFS_WRITE_ADDR,
	DVFS_WRITE_DATA,
	DVFS_CHANGE_SEND_TO_RECIEVE,
	DVFS_DONE,
	} DVFS_STATE_T;

	#define DVFS_PROCESS (1)
	#define DVFS_COMPLETE (0)
	#define DVFS_ERROR (-1)

	#if IMAGE_BL31
	#define IIC_DVFS_FUNC(__name, ...) \
	static int32_t __attribute__ ((section (".system_ram"))) \
	dvfs_ ##__name(__VA_ARGS__)

	#define RCAR_DVFS_API(__name, ...) \
	int32_t __attribute__ ((section (".system_ram"))) \
	rcar_iic_dvfs_ ##__name(__VA_ARGS__)

	#else
	#define IIC_DVFS_FUNC(__name, ...) \
	static int32_t dvfs_ ##__name(__VA_ARGS__)

	#define RCAR_DVFS_API(__name, ...) \
	int32_t rcar_iic_dvfs_ ##__name(__VA_ARGS__)
	#endif

	IIC_DVFS_FUNC(check_error, DVFS_STATE_T state, uint32_t err, uint8_t mode)
	{
	uint8_t icsr_al = 0, icsr_tack = 0;
	uint8_t reg, stop;
	uint32_t i = 0;

	stop = mode == DVFS_READ_MODE ? IIC_DVFS_SET_ICCR_STOP_READ :
	IIC_DVFS_SET_ICCR_STOP;

	reg = mmio_read_8(IIC_DVFS_REG_ICSR);
	icsr_al = (reg & IIC_DVFS_BIT_ICSR_AL) == IIC_DVFS_BIT_ICSR_AL;
	icsr_tack = (reg & IIC_DVFS_BIT_ICSR_TACK) == IIC_DVFS_BIT_ICSR_TACK;

	if (icsr_al == 0 && icsr_tack == 0)
	return DVFS_PROCESS;

	if (icsr_al) {
	reg = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_AL;
	mmio_write_8(IIC_DVFS_REG_ICSR, reg);

	if (*state == DVFS_SET_SLAVE)
	mmio_write_8(IIC_DVFS_REG_ICDR, IIC_DVFS_SET_DUMMY);

	do {
	reg = mmio_read_8(IIC_DVFS_REG_ICSR) &
	IIC_DVFS_BIT_ICSR_WAIT;
	} while (reg == 0);

	mmio_write_8(IIC_DVFS_REG_ICCR, stop);

	reg = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
	mmio_write_8(IIC_DVFS_REG_ICSR, reg);

	i = 0;
	do {
	reg = mmio_read_8(IIC_DVFS_REG_ICSR) &
	IIC_DVFS_BIT_ICSR_BUSY;
	if (reg == 0)
	break;

	if (i++ > IIC_DVFS_SET_BUSY_LOOP)
	panic();

	} while (1);

	mmio_write_8(IIC_DVFS_REG_ICCR, 0x00U);

	(*err)++;
	if (*err > DVFS_RETRY_MAX)
	return DVFS_ERROR;

	*state = DVFS_START;

	return DVFS_PROCESS;

	}

	/* icsr_tack */
	mmio_write_8(IIC_DVFS_REG_ICCR, stop);

	reg = mmio_read_8(IIC_DVFS_REG_ICIC);
	reg &= ~(IIC_DVFS_BIT_ICIC_WAITE \| IIC_DVFS_BIT_ICIC_DTEE);
	mmio_write_8(IIC_DVFS_REG_ICIC, reg);

	reg = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_TACK;
	mmio_write_8(IIC_DVFS_REG_ICSR, reg);

	i = 0;
	while ((mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_BUSY) != 0) {
	if (i++ > IIC_DVFS_SET_BUSY_LOOP)
	panic();
	}

	mmio_write_8(IIC_DVFS_REG_ICCR, 0);
	(*err)++;

	if (*err > DVFS_RETRY_MAX)
	return DVFS_ERROR;

	*state = DVFS_START;

	return DVFS_PROCESS;
	}

	IIC_DVFS_FUNC(start, DVFS_STATE_T * state)
	{
	uint8_t iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_E;
	uint8_t icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_E;
	int32_t result = DVFS_PROCESS;
	uint32_t reg, lsi_product;
	uint8_t mode;

	mode = mmio_read_8(IIC_DVFS_REG_ICCR) \| IIC_DVFS_BIT_ICCR_ENABLE;
	mmio_write_8(IIC_DVFS_REG_ICCR, mode);

	lsi_product = mmio_read_32(RCAR_PRR) & PRR_PRODUCT_MASK;
	if (lsi_product == PRR_PRODUCT_E3)
	goto start;

	reg = mmio_read_32(RCAR_MODEMR) & CHECK_MD13_MD14;
	switch (reg) {
	case MD14_MD13_TYPE_0:
	iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_0;
	icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_0;
	break;
	case MD14_MD13_TYPE_1:
	iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_1;
	icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_1;
	break;
	case MD14_MD13_TYPE_2:
	iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_2;
	icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_2;
	break;
	default:
	iccl = IIC_DVFS_SET_ICCL_EXTAL_TYPE_3;
	icch = IIC_DVFS_SET_ICCH_EXTAL_TYPE_3;
	break;
	}
	start:
	mmio_write_8(IIC_DVFS_REG_ICCL, iccl);
	mmio_write_8(IIC_DVFS_REG_ICCH, icch);

	mode = mmio_read_8(IIC_DVFS_REG_ICIC)
	\| IIC_DVFS_BIT_ICIC_TACKE
	\| IIC_DVFS_BIT_ICIC_WAITE \| IIC_DVFS_BIT_ICIC_DTEE;

	mmio_write_8(IIC_DVFS_REG_ICIC, mode);
	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_START);

	*state = DVFS_SET_SLAVE;

	return result;
	}

	IIC_DVFS_FUNC(set_slave, DVFS_STATE_T * state, uint32_t *err, uint8_t slave)
	{
	uint8_t mode;
	int32_t result;
	uint8_t address;

	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
	if (result == DVFS_ERROR)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_DTE;
	if (mode != IIC_DVFS_BIT_ICSR_DTE)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICIC) & ~IIC_DVFS_BIT_ICIC_DTEE;
	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

	address = slave << 1;
	mmio_write_8(IIC_DVFS_REG_ICDR, address);

	*state = DVFS_WRITE_ADDR;

	return result;
	}

	IIC_DVFS_FUNC(write_addr, DVFS_STATE_T state, uint32_t err, uint8_t reg_addr)
	{
	uint8_t mode;
	int32_t result;

	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
	if (result == DVFS_ERROR)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
	return result;

	mmio_write_8(IIC_DVFS_REG_ICDR, reg_addr);

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

	*state = DVFS_WRITE_DATA;

	return result;
	}

	IIC_DVFS_FUNC(write_data, DVFS_STATE_T state, uint32_t err, uint8_t reg_data)
	{
	int32_t result;
	uint8_t mode;

	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
	if (result == DVFS_ERROR)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
	return result;

	mmio_write_8(IIC_DVFS_REG_ICDR, reg_data);

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

	*state = DVFS_STOP;

	return result;
	}

	IIC_DVFS_FUNC(stop, DVFS_STATE_T state, uint32_t err)
	{
	int32_t result;
	uint8_t mode;

	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
	if (result == DVFS_ERROR)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
	return result;

	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_STOP);

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

	*state = DVFS_DONE;

	return result;
	}

	IIC_DVFS_FUNC(done, void)
	{
	uint32_t i;

	for (i = 0; i < IIC_DVFS_SET_BUSY_LOOP; i++) {
	if (mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_BUSY)
	continue;
	goto done;
	}

	panic();
	done:
	mmio_write_8(IIC_DVFS_REG_ICCR, 0);

	return DVFS_COMPLETE;
	}

	IIC_DVFS_FUNC(write_reg_addr_read, DVFS_STATE_T state, uint32_t err,
	uint8_t reg_addr)
	{
	int32_t result;
	uint8_t mode;

	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
	if (result == DVFS_ERROR)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
	return result;

	mmio_write_8(IIC_DVFS_REG_ICDR, reg_addr);

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

	*state = DVFS_RETRANSMIT;

	return result;
	}

	IIC_DVFS_FUNC(retransmit, DVFS_STATE_T state, uint32_t err)
	{
	int32_t result;
	uint8_t mode;

	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
	if (result == DVFS_ERROR)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
	return result;

	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_RETRANSMISSION);

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

	mode = mmio_read_8(IIC_DVFS_REG_ICIC) \| IIC_DVFS_BIT_ICIC_DTEE;
	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

	*state = DVFS_SET_SLAVE_READ;

	return result;
	}

	IIC_DVFS_FUNC(set_slave_read, DVFS_STATE_T state, uint32_t err,
	uint8_t slave)
	{
	uint8_t address;
	int32_t result;
	uint8_t mode;

	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
	if (result == DVFS_ERROR)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_DTE;
	if (mode != IIC_DVFS_BIT_ICSR_DTE)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICIC) & ~IIC_DVFS_BIT_ICIC_DTEE;
	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

	address = ((uint8_t) (slave << 1) + DVFS_READ_MODE);
	mmio_write_8(IIC_DVFS_REG_ICDR, address);

	*state = DVFS_CHANGE_SEND_TO_RECIEVE;

	return result;
	}

	IIC_DVFS_FUNC(change_send_to_recieve, DVFS_STATE_T state, uint32_t err)
	{
	int32_t result;
	uint8_t mode;

	result = dvfs_check_error(state, err, DVFS_WRITE_MODE);
	if (result == DVFS_ERROR)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
	return result;

	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_CHANGE);

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

	*state = DVFS_STOP_READ;

	return result;
	}

	IIC_DVFS_FUNC(stop_read, DVFS_STATE_T state, uint32_t err)
	{
	int32_t result;
	uint8_t mode;

	result = dvfs_check_error(state, err, DVFS_READ_MODE);
	if (result == DVFS_ERROR)
	return result;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_WAIT;
	if (mode != IIC_DVFS_BIT_ICSR_WAIT)
	return result;

	mmio_write_8(IIC_DVFS_REG_ICCR, IIC_DVFS_SET_ICCR_STOP_READ);

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & ~IIC_DVFS_BIT_ICSR_WAIT;
	mmio_write_8(IIC_DVFS_REG_ICSR, mode);

	mode = mmio_read_8(IIC_DVFS_REG_ICIC) \| IIC_DVFS_BIT_ICIC_DTEE;
	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

	*state = DVFS_READ;

	return result;
	}

	IIC_DVFS_FUNC(read, DVFS_STATE_T state, uint8_t reg_data)
	{
	uint8_t mode;

	mode = mmio_read_8(IIC_DVFS_REG_ICSR) & IIC_DVFS_BIT_ICSR_DTE;
	if (mode != IIC_DVFS_BIT_ICSR_DTE)
	return DVFS_PROCESS;

	mode = mmio_read_8(IIC_DVFS_REG_ICIC) & ~IIC_DVFS_BIT_ICIC_DTEE;
	mmio_write_8(IIC_DVFS_REG_ICIC, mode);

	*reg_data = mmio_read_8(IIC_DVFS_REG_ICDR);
	*state = DVFS_DONE;

	return DVFS_PROCESS;
	}

	RCAR_DVFS_API(send, uint8_t slave, uint8_t reg_addr, uint8_t reg_data)
	{
	DVFS_STATE_T state = DVFS_START;
	int32_t result = DVFS_PROCESS;
	uint32_t err = 0;

	mstpcr_write(SCMSTPCR9, CPG_MSTPSR9, CPG_BIT_SMSTPCR9_DVFS);
	mmio_write_8(IIC_DVFS_REG_ICCR, 0);
	again:
	switch (state) {
	case DVFS_START:
	result = dvfs_start(&state);
	break;
	case DVFS_SET_SLAVE:
	result = dvfs_set_slave(&state, &err, slave);
	break;
	case DVFS_WRITE_ADDR:
	result = dvfs_write_addr(&state, &err, reg_addr);
	break;
	case DVFS_WRITE_DATA:
	result = dvfs_write_data(&state, &err, reg_data);
	break;
	case DVFS_STOP:
	result = dvfs_stop(&state, &err);
	break;
	case DVFS_DONE:
	result = dvfs_done();
	break;
	default:
	panic();
	break;
	}

	if (result == DVFS_PROCESS)
	goto again;

	return result;
	}

	RCAR_DVFS_API(receive, uint8_t slave, uint8_t reg, uint8_t *data)
	{
	DVFS_STATE_T state = DVFS_START;
	int32_t result = DVFS_PROCESS;
	uint32_t err = 0;

	mstpcr_write(SCMSTPCR9, CPG_MSTPSR9, CPG_BIT_SMSTPCR9_DVFS);
	mmio_write_8(IIC_DVFS_REG_ICCR, 0);
	again:
	switch (state) {
	case DVFS_START:
	result = dvfs_start(&state);
	break;
	case DVFS_SET_SLAVE:
	result = dvfs_set_slave(&state, &err, slave);
	break;
	case DVFS_WRITE_ADDR:
	result = dvfs_write_reg_addr_read(&state, &err, reg);
	break;
	case DVFS_RETRANSMIT:
	result = dvfs_retransmit(&state, &err);
	break;
	case DVFS_SET_SLAVE_READ:
	result = dvfs_set_slave_read(&state, &err, slave);
	break;
	case DVFS_CHANGE_SEND_TO_RECIEVE:
	result = dvfs_change_send_to_recieve(&state, &err);
	break;
	case DVFS_STOP_READ:
	result = dvfs_stop_read(&state, &err);
	break;
	case DVFS_READ:
	result = dvfs_read(&state, data);
	break;
	case DVFS_DONE:
	result = dvfs_done();
	break;
	default:
	panic();
	break;
	}

	if (result == DVFS_PROCESS)
	goto again;

	return result;
	}