rcar_gen3: drivers: avs [adaptive voltage scaling]
Signed-off-by: ldts <jramirez@baylibre.com>
diff --git a/drivers/renesas/rcar/avs/avs_driver.c b/drivers/renesas/rcar/avs/avs_driver.c
new file mode 100644
index 0000000..80a7c91
--- /dev/null
+++ b/drivers/renesas/rcar/avs/avs_driver.c
@@ -0,0 +1,623 @@
+/*
+ * Copyright (c) 2015-2018, Renesas Electronics Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <mmio.h>
+#include <debug.h>
+#include <utils_def.h>
+#include "cpg_registers.h"
+#include "avs_driver.h"
+#include "rcar_def.h"
+#include "rcar_private.h"
+
+#if (AVS_SETTING_ENABLE == 1)
+#if PMIC_ROHM_BD9571
+/* Read PMIC register for debug. 1:enable / 0:disable */
+#define AVS_READ_PMIC_REG_ENABLE 0
+/* The re-try number of times of the AVS setting. */
+#define AVS_RETRY_NUM (1U)
+#endif /* PMIC_ROHM_BD9571 */
+
+/* Base address of Adaptive Voltage Scaling module registers*/
+#define AVS_BASE (0xE60A0000U)
+/* Adaptive Dynamic Voltage ADJust Parameter2 registers */
+#define ADVADJP2 (AVS_BASE + 0x013CU)
+
+/* Mask VOLCOND bit in ADVADJP2 registers */
+#define ADVADJP2_VOLCOND_MASK (0x000001FFU) /* VOLCOND[8:0] */
+
+#if PMIC_ROHM_BD9571
+/* I2C for DVFS bit in CPG registers for module standby and software reset*/
+#define CPG_SYS_DVFS_BIT (0x04000000U)
+#endif /* PMIC_ROHM_BD9571 */
+/* ADVFS Module bit in CPG registers for module standby and software reset*/
+#define CPG_SYS_ADVFS_BIT (0x02000000U)
+
+#if PMIC_ROHM_BD9571
+/* Base address of IICDVFS registers*/
+#define IIC_DVFS_BASE (0xE60B0000U)
+/* IIC bus data register */
+#define IIC_ICDR (IIC_DVFS_BASE + 0x0000U)
+/* IIC bus control register */
+#define IIC_ICCR (IIC_DVFS_BASE + 0x0004U)
+/* IIC bus status register */
+#define IIC_ICSR (IIC_DVFS_BASE + 0x0008U)
+/* IIC interrupt control register */
+#define IIC_ICIC (IIC_DVFS_BASE + 0x000CU)
+/* IIC clock control register low */
+#define IIC_ICCL (IIC_DVFS_BASE + 0x0010U)
+/* IIC clock control register high */
+#define IIC_ICCH (IIC_DVFS_BASE + 0x0014U)
+
+/* Bit in ICSR register */
+#define ICSR_BUSY (0x10U)
+#define ICSR_AL (0x08U)
+#define ICSR_TACK (0x04U)
+#define ICSR_WAIT (0x02U)
+#define ICSR_DTE (0x01U)
+
+/* Bit in ICIC register */
+#define ICIC_TACKE (0x04U)
+#define ICIC_WAITE (0x02U)
+#define ICIC_DTEE (0x01U)
+
+/* I2C bus interface enable */
+#define ICCR_ENABLE (0x80U)
+/* Start condition */
+#define ICCR_START (0x94U)
+/* Stop condition */
+#define ICCR_STOP (0x90U)
+/* Restart condition with change to receive mode change */
+#define ICCR_START_RECV (0x81U)
+/* Stop condition for receive mode */
+#define ICCR_STOP_RECV (0xC0U)
+
+/* Low-level period of SCL */
+#define ICCL_FREQ_8p33M (0x07U) /* for CP Phy 8.3333MHz */
+#define ICCL_FREQ_10M (0x09U) /* for CP Phy 10MHz */
+#define ICCL_FREQ_12p5M (0x0BU) /* for CP Phy 12.5MHz */
+#define ICCL_FREQ_16p66M (0x0EU) /* for CP Phy 16.6666MHz */
+/* High-level period of SCL */
+#define ICCH_FREQ_8p33M (0x01U) /* for CP Phy 8.3333MHz */
+#define ICCH_FREQ_10M (0x02U) /* for CP Phy 10MHz */
+#define ICCH_FREQ_12p5M (0x03U) /* for CP Phy 12.5MHz */
+#define ICCH_FREQ_16p66M (0x05U) /* for CP Phy 16.6666MHz */
+
+/* PMIC */
+#define PMIC_W_SLAVE_ADDRESS (0x60U) /* ROHM BD9571 slave address + (W) */
+#define PMIC_R_SLAVE_ADDRESS (0x61U) /* ROHM BD9571 slave address + (R) */
+#define PMIC_DVFS_SETVID (0x54U) /* ROHM BD9571 DVFS SetVID register */
+#endif /* PMIC_ROHM_BD9571 */
+
+/* Individual information */
+#define EFUSE_AVS0 (0U)
+#define EFUSE_AVS_NUM ARRAY_SIZE(init_vol_tbl)
+
+typedef struct {
+ uint32_t avs; /* AVS code */
+ uint8_t vol; /* Voltage */
+} initial_voltage_t;
+
+static const initial_voltage_t init_vol_tbl[] = {
+ /* AVS code, RHOM BD9571 DVFS SetVID register */
+ {0x00U, 0x53U}, /* AVS0, 0.83V */
+ {0x01U, 0x52U}, /* AVS1, 0.82V */
+ {0x02U, 0x51U}, /* AVS2, 0.81V */
+ {0x04U, 0x50U}, /* AVS3, 0.80V */
+ {0x08U, 0x4FU}, /* AVS4, 0.79V */
+ {0x10U, 0x4EU}, /* AVS5, 0.78V */
+ {0x20U, 0x4DU}, /* AVS6, 0.77V */
+ {0x40U, 0x4CU} /* AVS7, 0.76V */
+};
+
+#if PMIC_ROHM_BD9571
+/* Kind of AVS settings status */
+typedef enum {
+ avs_status_none = 0,
+ avs_status_init,
+ avs_status_start_condition,
+ avs_status_set_slave_addr,
+ avs_status_write_reg_addr,
+ avs_status_write_reg_data,
+ avs_status_stop_condition,
+ avs_status_end,
+ avs_status_complete,
+ avs_status_al_start,
+ avs_status_al_transfer,
+ avs_status_nack,
+ avs_status_error_stop,
+ ave_status_error_end
+} avs_status_t;
+
+/* Kind of AVS error */
+typedef enum {
+ avs_error_none = 0,
+ avs_error_al,
+ avs_error_nack
+} avs_error_t;
+
+static avs_status_t avs_status;
+static uint32_t avs_retry;
+#endif /* PMIC_ROHM_BD9571 */
+static uint32_t efuse_avs = EFUSE_AVS0;
+
+#if PMIC_ROHM_BD9571
+/* prototype */
+static avs_error_t avs_check_error(void);
+static void avs_set_iic_clock(void);
+#if AVS_READ_PMIC_REG_ENABLE == 1
+static uint8_t avs_read_pmic_reg(uint8_t addr);
+static void avs_poll(uint8_t bit_pos, uint8_t val);
+#endif
+#endif /* PMIC_ROHM_BD9571 */
+#endif /* (AVS_SETTING_ENABLE==1) */
+
+/*
+ * Initialize to enable the AVS setting.
+ */
+void rcar_avs_init(void)
+{
+#if (AVS_SETTING_ENABLE == 1)
+ uint32_t val;
+
+#if PMIC_ROHM_BD9571
+ /* Initialize AVS status */
+ avs_status = avs_status_init;
+#endif /* PMIC_ROHM_BD9571 */
+
+ /* Enable clock supply to ADVFS. */
+ mstpcr_write(CPG_SMSTPCR9, CPG_MSTPSR9, CPG_SYS_ADVFS_BIT);
+
+ /* Read AVS code (Initial values are derived from eFuse) */
+ val = mmio_read_32(ADVADJP2) & ADVADJP2_VOLCOND_MASK;
+
+ for (efuse_avs = 0U; efuse_avs < EFUSE_AVS_NUM; efuse_avs++) {
+ if (val == init_vol_tbl[efuse_avs].avs)
+ break;
+ }
+
+ if (efuse_avs >= EFUSE_AVS_NUM)
+ efuse_avs = EFUSE_AVS0; /* Not applicable */
+#if PMIC_ROHM_BD9571
+ /* Enable clock supply to DVFS. */
+ mstpcr_write(CPG_SMSTPCR9, CPG_MSTPSR9, CPG_SYS_DVFS_BIT);
+
+ /* Disable I2C module and All internal registers initialized. */
+ mmio_write_8(IIC_ICCR, 0x00U);
+ while ((mmio_read_8(IIC_ICCR) & ICCR_ENABLE) != 0U) {
+ /* Disable I2C module and All internal registers initialized. */
+ mmio_write_8(IIC_ICCR, 0x00U);
+ }
+
+ /* Set next status */
+ avs_status = avs_status_start_condition;
+
+#endif /* PMIC_ROHM_BD9571 */
+#endif /* (AVS_SETTING_ENABLE==1) */
+}
+
+/*
+ * Set the value of register corresponding to the voltage
+ * by transfer of I2C to PIMC.
+ */
+void rcar_avs_setting(void)
+{
+#if (AVS_SETTING_ENABLE == 1)
+#if PMIC_ROHM_BD9571
+ avs_error_t err;
+
+ switch (avs_status) {
+ case avs_status_start_condition:
+ /* Set ICCR.ICE=1 to activate the I2C module. */
+ mmio_write_8(IIC_ICCR, mmio_read_8(IIC_ICCR) | ICCR_ENABLE);
+ /* Set frequency of 400kHz */
+ avs_set_iic_clock();
+ /* Set ICIC.TACKE=1, ICIC.WAITE=1, ICIC.DTEE=1 to */
+ /* enable interrupt control. */
+ mmio_write_8(IIC_ICIC, mmio_read_8(IIC_ICIC)
+ | ICIC_TACKE | ICIC_WAITE | ICIC_DTEE);
+ /* Write H'94 in ICCR to issue start condition */
+ mmio_write_8(IIC_ICCR, ICCR_START);
+ /* Set next status */
+ avs_status = avs_status_set_slave_addr;
+ break;
+ case avs_status_set_slave_addr:
+ /* Check error. */
+ err = avs_check_error();
+ if (err == avs_error_al) {
+ /* Recovery sequence of just after start. */
+ avs_status = avs_status_al_start;
+ } else if (err == avs_error_nack) {
+ /* Recovery sequence of detected NACK */
+ avs_status = avs_status_nack;
+ } else {
+ /* Was data transmission enabled ? */
+ if ((mmio_read_8(IIC_ICSR) & ICSR_DTE) == ICSR_DTE) {
+ /* Clear ICIC.DTEE to disable a DTE interrupt */
+ mmio_write_8(IIC_ICIC, mmio_read_8(IIC_ICIC)
+ & (uint8_t) (~ICIC_DTEE));
+ /* Send PMIC slave address + (W) */
+ mmio_write_8(IIC_ICDR, PMIC_W_SLAVE_ADDRESS);
+ /* Set next status */
+ avs_status = avs_status_write_reg_addr;
+ }
+ }
+ break;
+ case avs_status_write_reg_addr:
+ /* Check error. */
+ err = avs_check_error();
+ if (err == avs_error_al) {
+ /* Recovery sequence of during data transfer. */
+ avs_status = avs_status_al_transfer;
+ } else if (err == avs_error_nack) {
+ /* Recovery sequence of detected NACK */
+ avs_status = avs_status_nack;
+ } else {
+ /* If wait state after data transmission. */
+ if ((mmio_read_8(IIC_ICSR) & ICSR_WAIT) == ICSR_WAIT) {
+ /* Write PMIC DVFS_SetVID address */
+ mmio_write_8(IIC_ICDR, PMIC_DVFS_SETVID);
+ /* Clear ICSR.WAIT to exit from wait state. */
+ mmio_write_8(IIC_ICSR, mmio_read_8(IIC_ICSR)
+ & (uint8_t) (~ICSR_WAIT));
+ /* Set next status */
+ avs_status = avs_status_write_reg_data;
+ }
+ }
+ break;
+ case avs_status_write_reg_data:
+ /* Check error. */
+ err = avs_check_error();
+ if (err == avs_error_al) {
+ /* Recovery sequence of during data transfer. */
+ avs_status = avs_status_al_transfer;
+ } else if (err == avs_error_nack) {
+ /* Recovery sequence of detected NACK */
+ avs_status = avs_status_nack;
+ } else {
+ /* If wait state after data transmission. */
+ if ((mmio_read_8(IIC_ICSR) & ICSR_WAIT) == ICSR_WAIT) {
+ /* Dose efuse_avs exceed the number of */
+ /* the tables? */
+ if (efuse_avs >= EFUSE_AVS_NUM) {
+ ERROR("AVS number of eFuse is out "
+ "of a range. number=%u\n",
+ efuse_avs);
+ /* Infinite loop */
+ panic();
+ }
+ /* Write PMIC DVFS_SetVID value */
+ mmio_write_8(IIC_ICDR,
+ init_vol_tbl[efuse_avs].vol);
+ /* Clear ICSR.WAIT to exit from wait state. */
+ mmio_write_8(IIC_ICSR, mmio_read_8(IIC_ICSR)
+ & (uint8_t) (~ICSR_WAIT));
+ /* Set next status */
+ avs_status = avs_status_stop_condition;
+ }
+ }
+ break;
+ case avs_status_stop_condition:
+ err = avs_check_error();
+ if (err == avs_error_al) {
+ /* Recovery sequence of during data transfer. */
+ avs_status = avs_status_al_transfer;
+ } else if (err == avs_error_nack) {
+ /* Recovery sequence of detected NACK */
+ avs_status = avs_status_nack;
+ } else {
+ /* If wait state after data transmission. */
+ if ((mmio_read_8(IIC_ICSR) & ICSR_WAIT) == ICSR_WAIT) {
+ /* Write H'90 in ICCR to issue stop condition */
+ mmio_write_8(IIC_ICCR, ICCR_STOP);
+ /* Clear ICSR.WAIT to exit from wait state. */
+ mmio_write_8(IIC_ICSR, mmio_read_8(IIC_ICSR)
+ & (uint8_t) (~ICSR_WAIT));
+ /* Set next status */
+ avs_status = avs_status_end;
+ }
+ }
+ break;
+ case avs_status_end:
+ /* Is this module not busy?. */
+ if ((mmio_read_8(IIC_ICSR) & ICSR_BUSY) == 0U) {
+ /* Set ICCR=H'00 to disable the I2C module. */
+ mmio_write_8(IIC_ICCR, 0x00U);
+ /* Set next status */
+ avs_status = avs_status_complete;
+ }
+ break;
+ case avs_status_al_start:
+ /* Clear ICSR.AL bit */
+ mmio_write_8(IIC_ICSR, (mmio_read_8(IIC_ICSR)
+ & (uint8_t) (~ICSR_AL)));
+ /* Transmit a clock pulse */
+ mmio_write_8(IIC_ICDR, init_vol_tbl[EFUSE_AVS0].vol);
+ /* Set next status */
+ avs_status = avs_status_error_stop;
+ break;
+ case avs_status_al_transfer:
+ /* Clear ICSR.AL bit */
+ mmio_write_8(IIC_ICSR, (mmio_read_8(IIC_ICSR)
+ & (uint8_t) (~ICSR_AL)));
+ /* Set next status */
+ avs_status = avs_status_error_stop;
+ break;
+ case avs_status_nack:
+ /* Write H'90 in ICCR to issue stop condition */
+ mmio_write_8(IIC_ICCR, ICCR_STOP);
+ /* Disable a WAIT and DTEE interrupt. */
+ mmio_write_8(IIC_ICIC, mmio_read_8(IIC_ICIC)
+ & (uint8_t) (~(ICIC_WAITE | ICIC_DTEE)));
+ /* Clear ICSR.TACK bit */
+ mmio_write_8(IIC_ICSR, mmio_read_8(IIC_ICSR)
+ & (uint8_t) (~ICSR_TACK));
+ /* Set next status */
+ avs_status = ave_status_error_end;
+ break;
+ case avs_status_error_stop:
+ /* If wait state after data transmission. */
+ if ((mmio_read_8(IIC_ICSR) & ICSR_WAIT) == ICSR_WAIT) {
+ /* Write H'90 in ICCR to issue stop condition */
+ mmio_write_8(IIC_ICCR, ICCR_STOP);
+ /* Clear ICSR.WAIT to exit from wait state. */
+ mmio_write_8(IIC_ICSR, mmio_read_8(IIC_ICSR)
+ & (uint8_t) (~ICSR_WAIT));
+ /* Set next status */
+ avs_status = ave_status_error_end;
+ }
+ break;
+ case ave_status_error_end:
+ /* Is this module not busy?. */
+ if ((mmio_read_8(IIC_ICSR) & ICSR_BUSY) == 0U) {
+ /* Set ICCR=H'00 to disable the I2C module. */
+ mmio_write_8(IIC_ICCR, 0x00U);
+ /* Increment the re-try number of times. */
+ avs_retry++;
+ /* Set start a re-try to status. */
+ avs_status = avs_status_start_condition;
+ }
+ break;
+ case avs_status_complete:
+ /* After "avs_status" became the "avs_status_complete", */
+ /* "avs_setting()" function may be called. */
+ break;
+ default:
+ /* This case is not possible. */
+ ERROR("AVS setting is in invalid status. status=%u\n",
+ avs_status);
+ /* Infinite loop */
+ panic();
+ break;
+ }
+#endif /* PMIC_ROHM_BD9571 */
+#endif /* (AVS_SETTING_ENABLE==1) */
+}
+
+/*
+ * Finish the AVS setting.
+ */
+void rcar_avs_end(void)
+{
+#if (AVS_SETTING_ENABLE == 1)
+ uint32_t mstp;
+
+#if PMIC_ROHM_BD9571
+ /* While status is not completion, be repeated. */
+ while (avs_status != avs_status_complete)
+ rcar_avs_setting();
+
+ NOTICE("AVS setting succeeded. DVFS_SetVID=0x%x\n",
+ init_vol_tbl[efuse_avs].vol);
+
+#if AVS_READ_PMIC_REG_ENABLE == 1
+ {
+ uint8_t addr = PMIC_DVFS_SETVID;
+ uint8_t value = avs_read_pmic_reg(addr);
+ NOTICE("Read PMIC register. address=0x%x value=0x%x \n",
+ addr, value);
+ }
+#endif
+
+ /* Bit of the module which wants to disable clock supply. */
+ mstp = CPG_SYS_DVFS_BIT;
+ /* Disables the supply of clock signal to a module. */
+ cpg_write(CPG_SMSTPCR9, mmio_read_32(CPG_SMSTPCR9) | mstp);
+#endif /* PMIC_ROHM_BD9571 */
+
+ /* Bit of the module which wants to disable clock supply. */
+ mstp = CPG_SYS_ADVFS_BIT;
+ /* Disables the supply of clock signal to a module. */
+ cpg_write(CPG_SMSTPCR9, mmio_read_32(CPG_SMSTPCR9) | mstp);
+
+#endif /* (AVS_SETTING_ENABLE==1) */
+}
+
+#if (AVS_SETTING_ENABLE == 1)
+#if PMIC_ROHM_BD9571
+/*
+ * Check error and judge re-try.
+ */
+static avs_error_t avs_check_error(void)
+{
+ avs_error_t ret;
+
+ if ((mmio_read_8(IIC_ICSR) & ICSR_AL) == ICSR_AL) {
+ NOTICE("Loss of arbitration is detected. "
+ "AVS status=%d Retry=%u\n", avs_status, avs_retry);
+ /* Check of retry number of times */
+ if (avs_retry >= AVS_RETRY_NUM) {
+ ERROR("AVS setting failed in retry. max=%u\n",
+ AVS_RETRY_NUM);
+ /* Infinite loop */
+ panic();
+ }
+ /* Set the error detected to error status. */
+ ret = avs_error_al;
+ } else if ((mmio_read_8(IIC_ICSR) & ICSR_TACK) == ICSR_TACK) {
+ NOTICE("Non-acknowledge is detected. "
+ "AVS status=%d Retry=%u\n", avs_status, avs_retry);
+ /* Check of retry number of times */
+ if (avs_retry >= AVS_RETRY_NUM) {
+ ERROR("AVS setting failed in retry. max=%u\n",
+ AVS_RETRY_NUM);
+ /* Infinite loop */
+ panic();
+ }
+ /* Set the error detected to error status. */
+ ret = avs_error_nack;
+ } else {
+ /* Not error. */
+ ret = avs_error_none;
+ }
+ return ret;
+}
+
+/*
+ * Set I2C for DVFS clock.
+ */
+static void avs_set_iic_clock(void)
+{
+ uint32_t md_pin;
+
+ /* Read Mode pin register. */
+ md_pin = mmio_read_32(RCAR_MODEMR) & CHECK_MD13_MD14;
+ /* Set the module clock (CP phy) for the IIC-DVFS. */
+ /* CP phy is EXTAL / 2. */
+ switch (md_pin) {
+ case MD14_MD13_TYPE_0: /* EXTAL = 16.6666MHz */
+ mmio_write_8(IIC_ICCL, ICCL_FREQ_8p33M);
+ mmio_write_8(IIC_ICCH, ICCH_FREQ_8p33M);
+ break;
+ case MD14_MD13_TYPE_1: /* EXTAL = 20MHz */
+ mmio_write_8(IIC_ICCL, ICCL_FREQ_10M);
+ mmio_write_8(IIC_ICCH, ICCH_FREQ_10M);
+ break;
+ case MD14_MD13_TYPE_2: /* EXTAL = 25MHz (H3/M3) */
+ mmio_write_8(IIC_ICCL, ICCL_FREQ_12p5M);
+ mmio_write_8(IIC_ICCH, ICCH_FREQ_12p5M);
+ break;
+ case MD14_MD13_TYPE_3: /* EXTAL = 33.3333MHz */
+ mmio_write_8(IIC_ICCL, ICCL_FREQ_16p66M);
+ mmio_write_8(IIC_ICCH, ICCH_FREQ_16p66M);
+ break;
+ default: /* This case is not possible. */
+ /* CP Phy frequency is to be set for the 16.66MHz */
+ mmio_write_8(IIC_ICCL, ICCL_FREQ_16p66M);
+ mmio_write_8(IIC_ICCH, ICCH_FREQ_16p66M);
+ break;
+ }
+}
+
+#if AVS_READ_PMIC_REG_ENABLE == 1
+/*
+ * Read the value of the register of PMIC.
+ */
+static uint8_t avs_read_pmic_reg(uint8_t addr)
+{
+ uint8_t reg;
+
+ /* Set ICCR.ICE=1 to activate the I2C module. */
+ mmio_write_8(IIC_ICCR, mmio_read_8(IIC_ICCR) | ICCR_ENABLE);
+
+ /* Set frequency of 400kHz */
+ avs_set_iic_clock();
+
+ /* Set ICIC.WAITE=1, ICIC.DTEE=1 to enable data transmission */
+ /* interrupt and wait interrupt. */
+ mmio_write_8(IIC_ICIC, mmio_read_8(IIC_ICIC) | ICIC_WAITE | ICIC_DTEE);
+
+ /* Write H'94 in ICCR to issue start condition */
+ mmio_write_8(IIC_ICCR, ICCR_START);
+
+ /* Wait for a until ICSR.DTE becomes 1. */
+ avs_poll(ICSR_DTE, 1U);
+
+ /* Clear ICIC.DTEE to disable a DTE interrupt. */
+ mmio_write_8(IIC_ICIC, mmio_read_8(IIC_ICIC) & (uint8_t) (~ICIC_DTEE));
+ /* Send slave address of PMIC */
+ mmio_write_8(IIC_ICDR, PMIC_W_SLAVE_ADDRESS);
+
+ /* Wait for a until ICSR.WAIT becomes 1. */
+ avs_poll(ICSR_WAIT, 1U);
+
+ /* write PMIC address */
+ mmio_write_8(IIC_ICDR, addr);
+ /* Clear ICSR.WAIT to exit from WAIT status. */
+ mmio_write_8(IIC_ICSR, mmio_read_8(IIC_ICSR) & (uint8_t) (~ICSR_WAIT));
+
+ /* Wait for a until ICSR.WAIT becomes 1. */
+ avs_poll(ICSR_WAIT, 1U);
+
+ /* Write H'94 in ICCR to issue restart condition */
+ mmio_write_8(IIC_ICCR, ICCR_START);
+ /* Clear ICSR.WAIT to exit from WAIT status. */
+ mmio_write_8(IIC_ICSR, mmio_read_8(IIC_ICSR) & (uint8_t) (~ICSR_WAIT));
+ /* Set ICIC.DTEE=1 to enable data transmission interrupt. */
+ mmio_write_8(IIC_ICIC, mmio_read_8(IIC_ICIC) | ICIC_DTEE);
+
+ /* Wait for a until ICSR.DTE becomes 1. */
+ avs_poll(ICSR_DTE, 1U);
+
+ /* Clear ICIC.DTEE to disable a DTE interrupt. */
+ mmio_write_8(IIC_ICIC, mmio_read_8(IIC_ICIC) & (uint8_t) (~ICIC_DTEE));
+ /* Send slave address of PMIC */
+ mmio_write_8(IIC_ICDR, PMIC_R_SLAVE_ADDRESS);
+
+ /* Wait for a until ICSR.WAIT becomes 1. */
+ avs_poll(ICSR_WAIT, 1U);
+
+ /* Write H'81 to ICCR to issue the repeated START condition */
+ /* for changing the transmission mode to the receive mode. */
+ mmio_write_8(IIC_ICCR, ICCR_START_RECV);
+ /* Clear ICSR.WAIT to exit from WAIT status. */
+ mmio_write_8(IIC_ICSR, mmio_read_8(IIC_ICSR) & (uint8_t) (~ICSR_WAIT));
+
+ /* Wait for a until ICSR.WAIT becomes 1. */
+ avs_poll(ICSR_WAIT, 1U);
+
+ /* Set ICCR to H'C0 for the STOP condition */
+ mmio_write_8(IIC_ICCR, ICCR_STOP_RECV);
+ /* Clear ICSR.WAIT to exit from WAIT status. */
+ mmio_write_8(IIC_ICSR, mmio_read_8(IIC_ICSR) & (uint8_t) (~ICSR_WAIT));
+ /* Set ICIC.DTEE=1 to enable data transmission interrupt. */
+ mmio_write_8(IIC_ICIC, mmio_read_8(IIC_ICIC) | ICIC_DTEE);
+
+ /* Wait for a until ICSR.DTE becomes 1. */
+ avs_poll(ICSR_DTE, 1U);
+
+ /* Receive DVFS SetVID register */
+ /* Clear ICIC.DTEE to disable a DTE interrupt. */
+ mmio_write_8(IIC_ICIC, mmio_read_8(IIC_ICIC) & (uint8_t) (~ICIC_DTEE));
+ /* Receive DVFS SetVID register */
+ reg = mmio_read_8(IIC_ICDR);
+
+ /* Wait until ICSR.BUSY is cleared. */
+ avs_poll(ICSR_BUSY, 0U);
+
+ /* Set ICCR=H'00 to disable the I2C module. */
+ mmio_write_8(IIC_ICCR, 0x00U);
+
+ return reg;
+}
+
+/*
+ * Wait processing by the polling.
+ */
+static void avs_poll(uint8_t bit_pos, uint8_t val)
+{
+ uint8_t bit_val = 0U;
+
+ if (val != 0U)
+ bit_val = bit_pos;
+
+ while (1) {
+ if ((mmio_read_8(IIC_ICSR) & bit_pos) == bit_val)
+ break;
+ }
+}
+#endif /* AVS_READ_PMIC_REG_ENABLE */
+#endif /* PMIC_ROHM_BD9571 */
+#endif /* (AVS_SETTING_ENABLE==1) */