/*
 * SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#include "esp_rom_sys.h"
#include "esp_attr.h"
#include "soc/i2c_ana_mst_reg.h"
#include "hal/regi2c_ctrl_ll.h"

#define REGI2C_BIAS_MST_SEL    (BIT(8))
#define REGI2C_BBPLL_MST_SEL   (BIT(9))
#define REGI2C_ULP_CAL_MST_SEL (BIT(10))
#define REGI2C_SAR_I2C_MST_SEL (BIT(11))
#define REGI2C_DIG_REG_MST_SEL (BIT(12))

#define REGI2C_BIAS_RD_MASK     (~BIT(6)    & I2C_ANA_MST_ANA_CONF1_M)
#define REGI2C_BBPLL_RD_MASK    (~BIT(7)    & I2C_ANA_MST_ANA_CONF1_M)
#define REGI2C_ULP_CAL_RD_MASK  (~BIT(8)    & I2C_ANA_MST_ANA_CONF1_M)
#define REGI2C_SAR_I2C_RD_MASK  (~BIT(9)    & I2C_ANA_MST_ANA_CONF1_M)
#define REGI2C_DIG_REG_RD_MASK  (~BIT(10)   & I2C_ANA_MST_ANA_CONF1_M)

#define I2C_ANA_MST_I2C_CTRL_REG(n) (I2C_ANA_MST_I2C0_CTRL_REG + n*4) // 0: I2C_ANA_MST_I2C0_CTRL_REG; 1: I2C_ANA_MST_I2C1_CTRL_REG

#define REGI2C_RTC_BUSY           (BIT(25))
#define REGI2C_RTC_BUSY_M         (BIT(25))
#define REGI2C_RTC_BUSY_V         0x1
#define REGI2C_RTC_BUSY_S         25

#define REGI2C_RTC_WR_CNTL        (BIT(24))
#define REGI2C_RTC_WR_CNTL_M      (BIT(24))
#define REGI2C_RTC_WR_CNTL_V      0x1
#define REGI2C_RTC_WR_CNTL_S      24

#define REGI2C_RTC_DATA           0x000000FF
#define REGI2C_RTC_DATA_M         ((I2C_RTC_DATA_V)<<(I2C_RTC_DATA_S))
#define REGI2C_RTC_DATA_V         0xFF
#define REGI2C_RTC_DATA_S         16

#define REGI2C_RTC_ADDR           0x000000FF
#define REGI2C_RTC_ADDR_M         ((I2C_RTC_ADDR_V)<<(I2C_RTC_ADDR_S))
#define REGI2C_RTC_ADDR_V         0xFF
#define REGI2C_RTC_ADDR_S         8

#define REGI2C_RTC_SLAVE_ID       0x000000FF
#define REGI2C_RTC_SLAVE_ID_M     ((I2C_RTC_SLAVE_ID_V)<<(I2C_RTC_SLAVE_ID_S))
#define REGI2C_RTC_SLAVE_ID_V     0xFF
#define REGI2C_RTC_SLAVE_ID_S     0

/* SLAVE */

#define REGI2C_BBPLL              (0x66)
#define REGI2C_BBPLL_HOSTID       0

#define REGI2C_BIAS               (0x6a)
#define REGI2C_BIAS_HOSTID        0

#define REGI2C_DIG_REG            (0x6d)
#define REGI2C_DIG_REG_HOSTID     0

#define REGI2C_ULP_CAL            (0x61)
#define REGI2C_ULP_CAL_HOSTID     0

#define REGI2C_SAR_I2C            (0x69)
#define REGI2C_SAR_I2C_HOSTID     0

/* SLAVE END */

uint8_t esp_rom_regi2c_read(uint8_t block, uint8_t host_id, uint8_t reg_add) __attribute__((alias("regi2c_read_impl")));
uint8_t esp_rom_regi2c_read_mask(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb) __attribute__((alias("regi2c_read_mask_impl")));
void esp_rom_regi2c_write(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t data) __attribute__((alias("regi2c_write_impl")));
void esp_rom_regi2c_write_mask(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb, uint8_t data) __attribute__((alias("regi2c_write_mask_impl")));

static IRAM_ATTR uint8_t regi2c_enable_block(uint8_t block)
{
    uint32_t i2c_sel = 0;

    regi2c_ctrl_ll_master_enable_clock(true);

    /* Before config I2C register, enable corresponding slave. */
    switch (block) {
    case REGI2C_BBPLL  :
        i2c_sel = REG_GET_BIT(I2C_ANA_MST_ANA_CONF2_REG, REGI2C_BBPLL_MST_SEL);
        REG_WRITE(I2C_ANA_MST_ANA_CONF1_REG, REGI2C_BBPLL_RD_MASK);
        break;
    case REGI2C_BIAS   :
        i2c_sel = REG_GET_BIT(I2C_ANA_MST_ANA_CONF2_REG, REGI2C_BIAS_MST_SEL);
        REG_WRITE(I2C_ANA_MST_ANA_CONF1_REG, REGI2C_BIAS_RD_MASK);
        break;
    case REGI2C_DIG_REG:
        i2c_sel = REG_GET_BIT(I2C_ANA_MST_ANA_CONF2_REG, REGI2C_DIG_REG_MST_SEL);
        REG_WRITE(I2C_ANA_MST_ANA_CONF1_REG, REGI2C_DIG_REG_RD_MASK);
        break;
    case REGI2C_ULP_CAL:
        i2c_sel = REG_GET_BIT(I2C_ANA_MST_ANA_CONF2_REG, REGI2C_ULP_CAL_MST_SEL);
        REG_WRITE(I2C_ANA_MST_ANA_CONF1_REG, REGI2C_ULP_CAL_RD_MASK);
        break;
    case REGI2C_SAR_I2C:
        i2c_sel = REG_GET_BIT(I2C_ANA_MST_ANA_CONF2_REG, REGI2C_SAR_I2C_MST_SEL);
        REG_WRITE(I2C_ANA_MST_ANA_CONF1_REG, REGI2C_SAR_I2C_RD_MASK);
        break;
    }

    return (uint8_t)(i2c_sel ? 0: 1);
}

uint8_t IRAM_ATTR regi2c_read_impl(uint8_t block, uint8_t host_id, uint8_t reg_add)
{
    (void)host_id;
    uint8_t i2c_sel = regi2c_enable_block(block);

    while (REG_GET_BIT(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_BUSY)); // wait i2c idle
    uint32_t temp = ((block & REGI2C_RTC_SLAVE_ID_V) << REGI2C_RTC_SLAVE_ID_S)
                    | (reg_add & REGI2C_RTC_ADDR_V) << REGI2C_RTC_ADDR_S;
    REG_WRITE(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), temp);
    while (REG_GET_BIT(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_BUSY));
    uint8_t ret = REG_GET_FIELD(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_DATA);

    return ret;
}

uint8_t IRAM_ATTR regi2c_read_mask_impl(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb)
{
    assert(msb - lsb < 8);
    uint8_t i2c_sel = regi2c_enable_block(block);

    (void)host_id;
    while (REG_GET_BIT(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_BUSY)); // wait i2c idle
    uint32_t temp = ((block & REGI2C_RTC_SLAVE_ID_V) << REGI2C_RTC_SLAVE_ID_S)
                    | (reg_add & REGI2C_RTC_ADDR_V) << REGI2C_RTC_ADDR_S;
    REG_WRITE(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), temp);
    while (REG_GET_BIT(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_BUSY));
    uint32_t data = REG_GET_FIELD(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_DATA);
    uint8_t ret = (uint8_t)((data >> lsb) & (~(0xFFFFFFFF << (msb - lsb + 1))));

    return ret;
}

void IRAM_ATTR regi2c_write_impl(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t data)
{
    (void)host_id;
    uint8_t i2c_sel = regi2c_enable_block(block);

    while (REG_GET_BIT(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_BUSY)); // wait i2c idle
    uint32_t temp = ((block & REGI2C_RTC_SLAVE_ID_V) << REGI2C_RTC_SLAVE_ID_S)
                    | ((reg_add & REGI2C_RTC_ADDR_V) << REGI2C_RTC_ADDR_S)
                    | ((0x1 & REGI2C_RTC_WR_CNTL_V) << REGI2C_RTC_WR_CNTL_S) // 0: READ I2C register; 1: Write I2C register;
                    | (((uint32_t)data & REGI2C_RTC_DATA_V) << REGI2C_RTC_DATA_S);
    REG_WRITE(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), temp);
    while (REG_GET_BIT(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_BUSY));
}

void IRAM_ATTR regi2c_write_mask_impl(uint8_t block, uint8_t host_id, uint8_t reg_add, uint8_t msb, uint8_t lsb, uint8_t data)
{
    (void)host_id;
    assert(msb - lsb < 8);
    uint8_t i2c_sel = regi2c_enable_block(block);

    while (REG_GET_BIT(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_BUSY));
    /*Read the i2c bus register*/
    uint32_t temp = ((block & REGI2C_RTC_SLAVE_ID_V) << REGI2C_RTC_SLAVE_ID_S)
                    | (reg_add & REGI2C_RTC_ADDR_V) << REGI2C_RTC_ADDR_S;
    REG_WRITE(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), temp);
    while (REG_GET_BIT(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_BUSY));
    temp = REG_GET_FIELD(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_DATA);
    /*Write the i2c bus register*/
    temp &= ((~(0xFFFFFFFF << lsb)) | (0xFFFFFFFF << (msb + 1)));
    temp = (((uint32_t)data & (~(0xFFFFFFFF << (msb - lsb + 1)))) << lsb) | temp;
    temp = ((block & REGI2C_RTC_SLAVE_ID_V) << REGI2C_RTC_SLAVE_ID_S)
            | ((reg_add & REGI2C_RTC_ADDR_V) << REGI2C_RTC_ADDR_S)
            | ((0x1 & REGI2C_RTC_WR_CNTL_V) << REGI2C_RTC_WR_CNTL_S)
            | ((temp & REGI2C_RTC_DATA_V) << REGI2C_RTC_DATA_S);
    REG_WRITE(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), temp);
    while (REG_GET_BIT(I2C_ANA_MST_I2C_CTRL_REG(i2c_sel), REGI2C_RTC_BUSY));
}