//
// Copyright 2010-2012,2015,2016 Ettus Research LLC
// Copyright 2018 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: GPL-3.0-or-later
//

#include "ad5623_regs.hpp" //aux dac
#include "ad7922_regs.hpp" //aux adc
#include "clock_ctrl.hpp"
#include "usrp2_fifo_ctrl.hpp"
#include "usrp2_regs.hpp" //wishbone address constants
#include <uhd/exception.hpp>
#include <uhd/types/dict.hpp>
#include <uhd/types/serial.hpp>
#include <uhd/usrp/dboard_iface.hpp>
#include <uhd/utils/algorithm.hpp>
#include <uhdlib/asio.hpp> //htonl and ntohl
#include <uhdlib/usrp/cores/gpio_core_200.hpp>
#include <cmath>

using namespace uhd;
using namespace uhd::usrp;

class usrp2_dboard_iface : public dboard_iface
{
public:
    usrp2_dboard_iface(timed_wb_iface::sptr wb_iface,
        uhd::i2c_iface::sptr i2c_iface,
        uhd::spi_iface::sptr spi_iface,
        usrp2_clock_ctrl::sptr clock_ctrl);
    ~usrp2_dboard_iface(void) override;

    special_props_t get_special_props(void) override
    {
        special_props_t props;
        props.soft_clock_divider = false;
        props.mangle_i2c_addrs   = false;
        return props;
    }

    void write_aux_dac(unit_t, aux_dac_t, double) override;
    double read_aux_adc(unit_t, aux_adc_t) override;

    void set_pin_ctrl(unit_t unit, uint32_t value, uint32_t mask = 0xffffffff) override;
    uint32_t get_pin_ctrl(unit_t unit) override;
    void set_atr_reg(
        unit_t unit, atr_reg_t reg, uint32_t value, uint32_t mask = 0xffffffff) override;
    uint32_t get_atr_reg(unit_t unit, atr_reg_t reg) override;
    void set_gpio_ddr(unit_t unit, uint32_t value, uint32_t mask = 0xffffffff) override;
    uint32_t get_gpio_ddr(unit_t unit) override;
    void set_gpio_out(unit_t unit, uint32_t value, uint32_t mask = 0xffffffff) override;
    uint32_t get_gpio_out(unit_t unit) override;
    uint32_t read_gpio(unit_t unit) override;

    void set_command_time(const uhd::time_spec_t& t) override;
    uhd::time_spec_t get_command_time(void) override;

    void write_i2c(uint16_t, const byte_vector_t&) override;
    byte_vector_t read_i2c(uint16_t, size_t) override;

    void set_clock_rate(unit_t, double) override;
    double get_clock_rate(unit_t) override;
    std::vector<double> get_clock_rates(unit_t) override;
    void set_clock_enabled(unit_t, bool) override;
    double get_codec_rate(unit_t) override;
    void set_fe_connection(
        unit_t unit, const std::string&, const fe_connection_t& fe_conn) override;

    void write_spi(
        unit_t unit, const spi_config_t& config, uint32_t data, size_t num_bits) override;

    uint32_t read_write_spi(
        unit_t unit, const spi_config_t& config, uint32_t data, size_t num_bits) override;

private:
    timed_wb_iface::sptr _wb_iface;
    uhd::i2c_iface::sptr _i2c_iface;
    uhd::spi_iface::sptr _spi_iface;
    usrp2_clock_ctrl::sptr _clock_ctrl;
    gpio_core_200::sptr _gpio;

    uhd::dict<unit_t, ad5623_regs_t> _dac_regs;
    uhd::dict<unit_t, double> _clock_rates;
    void _write_aux_dac(unit_t);
};

/***********************************************************************
 * Make Function
 **********************************************************************/
dboard_iface::sptr make_usrp2_dboard_iface(timed_wb_iface::sptr wb_iface,
    uhd::i2c_iface::sptr i2c_iface,
    uhd::spi_iface::sptr spi_iface,
    usrp2_clock_ctrl::sptr clock_ctrl)
{
    return dboard_iface::sptr(
        new usrp2_dboard_iface(wb_iface, i2c_iface, spi_iface, clock_ctrl));
}

/***********************************************************************
 * Structors
 **********************************************************************/
usrp2_dboard_iface::usrp2_dboard_iface(timed_wb_iface::sptr wb_iface,
    uhd::i2c_iface::sptr i2c_iface,
    uhd::spi_iface::sptr spi_iface,
    usrp2_clock_ctrl::sptr clock_ctrl)
    : _wb_iface(wb_iface)
    , _i2c_iface(i2c_iface)
    , _spi_iface(spi_iface)
    , _clock_ctrl(clock_ctrl)
{
    _gpio = gpio_core_200::make(wb_iface, U2_REG_SR_ADDR(SR_GPIO), U2_REG_GPIO_RB);

    // reset the aux dacs
    _dac_regs[UNIT_RX] = ad5623_regs_t();
    _dac_regs[UNIT_TX] = ad5623_regs_t();
    for (unit_t unit : _dac_regs.keys()) {
        _dac_regs[unit].data = 1;
        _dac_regs[unit].addr = ad5623_regs_t::ADDR_ALL;
        _dac_regs[unit].cmd  = ad5623_regs_t::CMD_RESET;
        this->_write_aux_dac(unit);
    }

    // init the clock rate shadows with max rate clock
    this->set_clock_rate(UNIT_RX, sorted(this->get_clock_rates(UNIT_RX)).back());
    this->set_clock_rate(UNIT_TX, sorted(this->get_clock_rates(UNIT_TX)).back());
}

usrp2_dboard_iface::~usrp2_dboard_iface(void)
{
    /* NOP */
}

/***********************************************************************
 * Clocks
 **********************************************************************/
void usrp2_dboard_iface::set_clock_rate(unit_t unit, double rate)
{
    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");
    _clock_rates[unit] = rate; // set to shadow
    switch (unit) {
        case UNIT_RX:
            _clock_ctrl->set_rate_rx_dboard_clock(rate);
            return;
        case UNIT_TX:
            _clock_ctrl->set_rate_tx_dboard_clock(rate);
            return;
        default:
            UHD_THROW_INVALID_CODE_PATH();
    }
}

double usrp2_dboard_iface::get_clock_rate(unit_t unit)
{
    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");
    return _clock_rates[unit]; // get from shadow
}

std::vector<double> usrp2_dboard_iface::get_clock_rates(unit_t unit)
{
    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");
    switch (unit) {
        case UNIT_RX:
            return _clock_ctrl->get_rates_rx_dboard_clock();
        case UNIT_TX:
            return _clock_ctrl->get_rates_tx_dboard_clock();
        default:
            UHD_THROW_INVALID_CODE_PATH();
    }
}

void usrp2_dboard_iface::set_clock_enabled(unit_t unit, bool enb)
{
    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");
    switch (unit) {
        case UNIT_RX:
            _clock_ctrl->enable_rx_dboard_clock(enb);
            return;
        case UNIT_TX:
            _clock_ctrl->enable_tx_dboard_clock(enb);
            return;
        default:
            UHD_THROW_INVALID_CODE_PATH();
    }
}

double usrp2_dboard_iface::get_codec_rate(unit_t unit)
{
    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");
    return _clock_ctrl->get_master_clock_rate();
}

/***********************************************************************
 * GPIO
 **********************************************************************/
void usrp2_dboard_iface::set_pin_ctrl(unit_t unit, uint32_t value, uint32_t mask)
{
    _gpio->set_pin_ctrl(unit, static_cast<uint16_t>(value), static_cast<uint16_t>(mask));
}

uint32_t usrp2_dboard_iface::get_pin_ctrl(unit_t unit)
{
    return static_cast<uint32_t>(_gpio->get_pin_ctrl(unit));
}

void usrp2_dboard_iface::set_atr_reg(
    unit_t unit, atr_reg_t reg, uint32_t value, uint32_t mask)
{
    _gpio->set_atr_reg(
        unit, reg, static_cast<uint16_t>(value), static_cast<uint16_t>(mask));
}

uint32_t usrp2_dboard_iface::get_atr_reg(unit_t unit, atr_reg_t reg)
{
    return static_cast<uint32_t>(_gpio->get_atr_reg(unit, reg));
}

void usrp2_dboard_iface::set_gpio_ddr(unit_t unit, uint32_t value, uint32_t mask)
{
    _gpio->set_gpio_ddr(unit, static_cast<uint16_t>(value), static_cast<uint16_t>(mask));
}

uint32_t usrp2_dboard_iface::get_gpio_ddr(unit_t unit)
{
    return static_cast<uint32_t>(_gpio->get_gpio_ddr(unit));
}

void usrp2_dboard_iface::set_gpio_out(unit_t unit, uint32_t value, uint32_t mask)
{
    _gpio->set_gpio_out(unit, static_cast<uint16_t>(value), static_cast<uint16_t>(mask));
}

uint32_t usrp2_dboard_iface::get_gpio_out(unit_t unit)
{
    return static_cast<uint32_t>(_gpio->get_gpio_out(unit));
}

uint32_t usrp2_dboard_iface::read_gpio(unit_t unit)
{
    return _gpio->read_gpio(unit);
}

/***********************************************************************
 * SPI
 **********************************************************************/
static const uhd::dict<dboard_iface::unit_t, int> unit_to_spi_dev{
    {dboard_iface::UNIT_TX, SPI_SS_TX_DB}, {dboard_iface::UNIT_RX, SPI_SS_RX_DB}};

void usrp2_dboard_iface::write_spi(
    unit_t unit, const spi_config_t& config, uint32_t data, size_t num_bits)
{
    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");
    _spi_iface->write_spi(unit_to_spi_dev[unit], config, data, num_bits);
}

uint32_t usrp2_dboard_iface::read_write_spi(
    unit_t unit, const spi_config_t& config, uint32_t data, size_t num_bits)
{
    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");
    return _spi_iface->read_spi(unit_to_spi_dev[unit], config, data, num_bits);
}

/***********************************************************************
 * I2C
 **********************************************************************/
void usrp2_dboard_iface::write_i2c(uint16_t addr, const byte_vector_t& bytes)
{
    return _i2c_iface->write_i2c(addr, bytes);
}

byte_vector_t usrp2_dboard_iface::read_i2c(uint16_t addr, size_t num_bytes)
{
    return _i2c_iface->read_i2c(addr, num_bytes);
}

/***********************************************************************
 * Aux DAX/ADC
 **********************************************************************/
void usrp2_dboard_iface::_write_aux_dac(unit_t unit)
{
    static const uhd::dict<unit_t, int> unit_to_spi_dac{
        {UNIT_RX, SPI_SS_RX_DAC}, {UNIT_TX, SPI_SS_TX_DAC}};
    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");
    _spi_iface->write_spi(
        unit_to_spi_dac[unit], spi_config_t::EDGE_FALL, _dac_regs[unit].get_reg(), 24);
}

void usrp2_dboard_iface::write_aux_dac(unit_t unit, aux_dac_t which, double value)
{
    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");

    _dac_regs[unit].data = static_cast<int>(std::lround(4095 * value / 3.3));
    _dac_regs[unit].cmd  = ad5623_regs_t::CMD_WR_UP_DAC_CHAN_N;

    typedef uhd::dict<aux_dac_t, ad5623_regs_t::addr_t> aux_dac_to_addr;
    static const uhd::dict<unit_t, aux_dac_to_addr> unit_to_which_to_addr{
        {UNIT_RX,
            {{AUX_DAC_A, ad5623_regs_t::ADDR_DAC_B},
                {AUX_DAC_B, ad5623_regs_t::ADDR_DAC_A},
                {AUX_DAC_C, ad5623_regs_t::ADDR_DAC_A},
                {AUX_DAC_D, ad5623_regs_t::ADDR_DAC_B}}},
        {UNIT_TX,
            {{AUX_DAC_A, ad5623_regs_t::ADDR_DAC_A},
                {AUX_DAC_B, ad5623_regs_t::ADDR_DAC_B},
                {AUX_DAC_C, ad5623_regs_t::ADDR_DAC_B},
                {AUX_DAC_D, ad5623_regs_t::ADDR_DAC_A}}}};
    _dac_regs[unit].addr = unit_to_which_to_addr[unit][which];
    this->_write_aux_dac(unit);
}

double usrp2_dboard_iface::read_aux_adc(unit_t unit, aux_adc_t which)
{
    static const uhd::dict<unit_t, int> unit_to_spi_adc{
        {UNIT_RX, SPI_SS_RX_ADC}, {UNIT_TX, SPI_SS_TX_ADC}};

    if (unit == UNIT_BOTH)
        throw uhd::runtime_error("UNIT_BOTH not supported.");

    // setup spi config args
    spi_config_t config;
    config.mosi_edge = spi_config_t::EDGE_FALL;
    config.miso_edge = spi_config_t::EDGE_RISE;

    // setup the spi registers
    ad7922_regs_t ad7922_regs;
    switch (which) {
        case AUX_ADC_A:
            ad7922_regs.mod = 0;
            break;
        case AUX_ADC_B:
            ad7922_regs.mod = 1;
            break;
    }
    ad7922_regs.chn = ad7922_regs.mod; // normal mode: mod == chn

    // write and read spi
    _spi_iface->write_spi(unit_to_spi_adc[unit], config, ad7922_regs.get_reg(), 16);
    ad7922_regs.set_reg(uint16_t(
        _spi_iface->read_spi(unit_to_spi_adc[unit], config, ad7922_regs.get_reg(), 16)));

    // convert to voltage and return
    return 3.3 * ad7922_regs.result / 4095;
}

uhd::time_spec_t usrp2_dboard_iface::get_command_time()
{
    return _wb_iface->get_time();
}

void usrp2_dboard_iface::set_command_time(const uhd::time_spec_t& t)
{
    _wb_iface->set_time(t);
}

void usrp2_dboard_iface::set_fe_connection(
    unit_t, const std::string&, const fe_connection_t&)
{
    throw uhd::not_implemented_error(
        "fe connection configuration support not implemented");
}
