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authorJorge Ramirez-Ortiz <jramirez@baylibre.com>2018-09-23 09:40:26 +0200
committerldts <jorge.ramirez.ortiz@gmail.com>2018-10-17 18:41:34 +0200
commitda963e316446eeff0e2932946b98ea50b99f5b78 (patch)
treef4559d436b8971dcdbd0aa87632e991e4c495748 /drivers/renesas/rcar
parent3bfe202af6bb6353d6cd9fdae8a0167e3c9b5a3e (diff)
downloadtrusted-firmware-a-da963e316446eeff0e2932946b98ea50b99f5b78.tar.gz
rcar_gen3: drivers: i2c dvfs
Signed-off-by: ldts <jramirez@baylibre.com>
Diffstat (limited to 'drivers/renesas/rcar')
-rw-r--r--drivers/renesas/rcar/iic_dvfs/iic_dvfs.c568
-rw-r--r--drivers/renesas/rcar/iic_dvfs/iic_dvfs.h23
2 files changed, 591 insertions, 0 deletions
diff --git a/drivers/renesas/rcar/iic_dvfs/iic_dvfs.c b/drivers/renesas/rcar/iic_dvfs/iic_dvfs.c
new file mode 100644
index 0000000000..11d52bf76d
--- /dev/null
+++ b/drivers/renesas/rcar/iic_dvfs/iic_dvfs.c
@@ -0,0 +1,568 @@
+/*
+ * Copyright (c) 2015-2018, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <mmio.h>
+#include <debug.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) & RCAR_PRODUCT_MASK;
+ if (lsi_product == RCAR_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;
+}
diff --git a/drivers/renesas/rcar/iic_dvfs/iic_dvfs.h b/drivers/renesas/rcar/iic_dvfs/iic_dvfs.h
new file mode 100644
index 0000000000..3c4a9a5523
--- /dev/null
+++ b/drivers/renesas/rcar/iic_dvfs/iic_dvfs.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2015-2017, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef IIC_DVFS_H__
+#define IIC_DVFS_H__
+
+/* PMIC slave */
+#define PMIC (0x30)
+#define BKUP_MODE_CNT (0x20)
+#define DVFS_SET_VID (0x54)
+#define REG_KEEP10 (0x79)
+
+/* EEPROM slave */
+#define EEPROM (0x50)
+#define BOARD_ID (0x70)
+
+int32_t rcar_iic_dvfs_receive(uint8_t slave, uint8_t reg, uint8_t *data);
+int32_t rcar_iic_dvfs_send(uint8_t slave, uint8_t regr, uint8_t data);
+
+#endif