/*
 * Copyright (c) 2015-2016, Freescale Semiconductor, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * o Redistributions of source code must retain the above copyright notice, this list
 *   of conditions and the following disclaimer.
 *
 * o Redistributions in binary form must reproduce the above copyright notice, this
 *   list of conditions and the following disclaimer in the documentation and/or
 *   other materials provided with the distribution.
 *
 * o Neither the name of Freescale Semiconductor, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived from this
 *   software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "fsl_smartcard_emvsim.h"
#include "fsl_smartcard_phy_emvsim.h"

/*******************************************************************************
 * Variables
 ******************************************************************************/

/*******************************************************************************
 * Private Functions
 ******************************************************************************/
static uint32_t smartcard_phy_emvsim_InterfaceClockInit(EMVSIM_Type *base,
                                                        const smartcard_interface_config_t *config,
                                                        uint32_t srcClock_Hz);

/*******************************************************************************
 * Code
 ******************************************************************************/

/*!
 * @brief This function initializes clock module used for card clock generation
 */
static uint32_t smartcard_phy_emvsim_InterfaceClockInit(EMVSIM_Type *base,
                                                        const smartcard_interface_config_t *config,
                                                        uint32_t srcClock_Hz)
{
    assert((NULL != config) && (0u != srcClock_Hz));

    uint32_t emvsimClkMhz = 0u;
    uint8_t emvsimPRSCValue;

    /* Retrieve EMV SIM clock */
    emvsimClkMhz = srcClock_Hz / 1000000u;
    /* Calculate MOD value */
    emvsimPRSCValue = (emvsimClkMhz * 1000u) / (config->smartCardClock / 1000u);
    /* Set clock prescaler */
    base->CLKCFG = (base->CLKCFG & ~EMVSIM_CLKCFG_CLK_PRSC_MASK) | EMVSIM_CLKCFG_CLK_PRSC(emvsimPRSCValue);

    return config->smartCardClock;
}

void SMARTCARD_PHY_EMVSIM_GetDefaultConfig(smartcard_interface_config_t *config)
{
    assert((NULL != config));

    config->clockToResetDelay = SMARTCARD_INIT_DELAY_CLOCK_CYCLES;
    config->vcc = kSMARTCARD_VoltageClassB3_3V;
}

status_t SMARTCARD_PHY_EMVSIM_Init(EMVSIM_Type *base, smartcard_interface_config_t const *config, uint32_t srcClock_Hz)
{
    if ((NULL == config) || (0u == srcClock_Hz))
    {
        return kStatus_SMARTCARD_InvalidInput;
    }

    /* SMARTCARD clock initialization. Clock is still not active after this call */
    if (config->smartCardClock != smartcard_phy_emvsim_InterfaceClockInit(base, config, srcClock_Hz))
    {
        return kStatus_SMARTCARD_OtherError;
    }
    /* Configure EMVSIM direct interface driver interrupt occur according card presence */
    if (base->PCSR & EMVSIM_PCSR_SPDP_MASK)
    {
        base->PCSR &= ~EMVSIM_PCSR_SPDES_MASK;
    }
    else
    {
        base->PCSR |= EMVSIM_PCSR_SPDES_MASK;
    }
    /* Un-mask presence detect interrupt flag */
    base->PCSR &= ~EMVSIM_PCSR_SPDIM_MASK;

    return kStatus_SMARTCARD_Success;
}

void SMARTCARD_PHY_EMVSIM_Deinit(EMVSIM_Type *base, const smartcard_interface_config_t *config)
{
    assert((NULL != config));
    /* Deactivate VCC, CLOCK */
    base->PCSR &= ~(EMVSIM_PCSR_SCEN_MASK | EMVSIM_PCSR_SVCC_EN_MASK);
}

status_t SMARTCARD_PHY_EMVSIM_Activate(EMVSIM_Type *base,
                                       smartcard_context_t *context,
                                       smartcard_reset_type_t resetType)
{
    if ((NULL == context) || (NULL == context->timeDelay))
    {
        return kStatus_SMARTCARD_InvalidInput;
    }
    assert(context->interfaceConfig.vcc == kSMARTCARD_VoltageClassB3_3V);

    context->timersState.initCharTimerExpired = false;
    context->resetType = resetType;

    /* Disable receiver to deactivate GPC timers trigger */
    base->CTRL &= ~EMVSIM_CTRL_RCV_EN_MASK;
    if (resetType == kSMARTCARD_ColdReset)
    { /* Set polarity of VCC to active high, Enable VCC for SMARTCARD, Enable smart card clock */
        base->PCSR = (base->PCSR & ~EMVSIM_PCSR_VCCENP_MASK) | (EMVSIM_PCSR_SVCC_EN_MASK | EMVSIM_PCSR_SCEN_MASK);
        /* Set transfer inversion to default(direct) value */
        base->CTRL &= ~EMVSIM_CTRL_IC_MASK;
    }
    else if (resetType == kSMARTCARD_WarmReset)
    { /* Ensure that card is already active */
        if (!context->cardParams.active)
        { /* Card is not active;hence return */
            return kStatus_SMARTCARD_CardNotActivated;
        }
    }
    else
    {
        return kStatus_SMARTCARD_InvalidInput;
    }
    /* Set Reset low */
    base->PCSR &= ~EMVSIM_PCSR_SRST_MASK;
    /* Calculate time delay needed for reset */
    uint32_t temp = (uint32_t)((float)(1 + (float)(((float)(1000u * context->interfaceConfig.clockToResetDelay)) /
                                                   ((float)context->interfaceConfig.smartCardClock / 1000))));
    context->timeDelay(temp);
    /* Pull reset HIGH Now to mark the end of Activation sequence */
    base->PCSR |= EMVSIM_PCSR_SRST_MASK;
    /* Disable GPC timers input clock */
    base->CLKCFG &= ~(EMVSIM_CLKCFG_GPCNT0_CLK_SEL_MASK | EMVSIM_CLKCFG_GPCNT1_CLK_SEL_MASK);
    /* Down counter trigger, and clear any pending counter status flag */
    base->TX_STATUS = EMVSIM_TX_STATUS_GPCNT1_TO_MASK | EMVSIM_TX_STATUS_GPCNT0_TO_MASK;
    /* Set counter value for TS detection delay */
    base->GPCNT0_VAL = (SMARTCARD_INIT_DELAY_CLOCK_CYCLES + SMARTCARD_INIT_DELAY_CLOCK_CYCLES_ADJUSTMENT);
    /* Pre-load counter value for ATR duration delay */
    base->GPCNT1_VAL = (SMARTCARD_EMV_ATR_DURATION_ETU + SMARTCARD_ATR_DURATION_ADJUSTMENT);
    /* Select the clock for GPCNT for both TS detection and early start of ATR duration counter */
    base->CLKCFG |=
        (EMVSIM_CLKCFG_GPCNT0_CLK_SEL(kEMVSIM_GPCCardClock) | EMVSIM_CLKCFG_GPCNT1_CLK_SEL(kEMVSIM_GPCTxClock));
    /* Set receiver to ICM mode, Flush RX FIFO */
    base->CTRL |= (EMVSIM_CTRL_ICM_MASK | EMVSIM_CTRL_FLSH_RX_MASK);
    /* Enable counter interrupt for TS detection */
    base->INT_MASK &= ~EMVSIM_INT_MASK_GPCNT0_IM_MASK;
    /* Clear any pending status flags */
    base->RX_STATUS = 0xFFFFFFFFu;
    /* Enable receiver */
    base->CTRL |= EMVSIM_CTRL_RCV_EN_MASK;
    /* Here the card was activated */
    context->cardParams.active = true;

    return kStatus_SMARTCARD_Success;
}

status_t SMARTCARD_PHY_EMVSIM_Deactivate(EMVSIM_Type *base, smartcard_context_t *context)
{
    if ((NULL == context))
    {
        return kStatus_SMARTCARD_InvalidInput;
    }

    /* Assert Reset */
    base->PCSR &= ~EMVSIM_PCSR_SRST_MASK;
    /* Stop SMARTCARD clock generation */
    base->PCSR &= ~EMVSIM_PCSR_SCEN_MASK;
    /* Deactivate card by disabling VCC */
    base->PCSR &= ~EMVSIM_PCSR_SVCC_EN_MASK;
    /* According EMV 4.3 specification deactivation sequence should be done within 100ms.
     * The period is measured from the time that RST is set to state L to the time that Vcc
     * reaches 0.4 V or less.
     */
    context->timeDelay(100 * 1000);
    /* Here the card was deactivated */
    context->cardParams.active = false;

    return kStatus_SMARTCARD_Success;
}

status_t SMARTCARD_PHY_EMVSIM_Control(EMVSIM_Type *base,
                                      smartcard_context_t *context,
                                      smartcard_interface_control_t control,
                                      uint32_t param)
{
    if ((NULL == context))
    {
        return kStatus_SMARTCARD_InvalidInput;
    }

    switch (control)
    {
        case kSMARTCARD_InterfaceSetVcc:
            /* Only 3.3V interface supported by the direct interface */
            assert((smartcard_card_voltage_class_t)param == kSMARTCARD_VoltageClassB3_3V);
            context->interfaceConfig.vcc = (smartcard_card_voltage_class_t)param;
            break;
        case kSMARTCARD_InterfaceSetClockToResetDelay:
            /* Set interface clock to Reset delay set by caller */
            context->interfaceConfig.clockToResetDelay = param;
            break;
        case kSMARTCARD_InterfaceReadStatus:
            /* Expecting active low present detect */
            context->cardParams.present =
                (emvsim_presence_detect_status_t)((base->PCSR & EMVSIM_PCSR_SPDP_MASK) >> EMVSIM_PCSR_SPDP_SHIFT) ==
                kEMVSIM_DetectPinIsLow;
            break;
        default:
            return kStatus_SMARTCARD_InvalidInput;
    }

    return kStatus_SMARTCARD_Success;
}

