/* mbed Microcontroller Library
 * Copyright (c) 2006-2013 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include <stddef.h>
#include "cmsis.h"

#include "gpio_irq_api.h"
#include "gpio_api.h"
#include "fsl_gpio_hal.h"
#include "fsl_port_hal.h"
#include "error.h"

#define CHANNEL_NUM    160

static uint32_t channel_ids[CHANNEL_NUM] = {0};
static gpio_irq_handler irq_handler;

#define IRQ_DISABLED        (0)
#define IRQ_RAISING_EDGE    (9)
#define IRQ_FALLING_EDGE    (10)
#define IRQ_EITHER_EDGE     (11)

static void handle_interrupt_in(PortName port, int ch_base) {
    uint32_t i;

    for (i = 0; i < 32; i++) {
        if (port_hal_read_pin_interrupt_flag(port, i)) {
            uint32_t id = channel_ids[ch_base + i];
            if (id == 0) {
                continue;
            }

            gpio_irq_event event = IRQ_NONE;
            switch (BR_PORT_PCRn_IRQC(port, i)) {
                case IRQ_RAISING_EDGE:
                    event = IRQ_RISE;
                    break;

                case IRQ_FALLING_EDGE:
                    event = IRQ_FALL;
                    break;

                case IRQ_EITHER_EDGE:
                    event = (gpio_hal_read_pin_input(port, i)) ? (IRQ_RISE) : (IRQ_FALL);
                    break;
            }
            if (event != IRQ_NONE) {
                irq_handler(id, event);
            }
        }
    }
    port_hal_clear_port_interrupt_flag(port);
}

void gpio_irqA(void) {handle_interrupt_in(PortA, 0);}
void gpio_irqB(void) {handle_interrupt_in(PortB, 32);}
void gpio_irqC(void) {handle_interrupt_in(PortC, 64);}
void gpio_irqD(void) {handle_interrupt_in(PortD, 96);}
void gpio_irqE(void) {handle_interrupt_in(PortE, 128);}

int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32_t id) {
    if (pin == NC) {
        return -1;
   }

    irq_handler = handler;
    obj->port = pin >> GPIO_PORT_SHIFT;
    obj->pin = pin & 0x7F;

    uint32_t ch_base, vector;
    IRQn_Type irq_n;
    switch (obj->port) {
        case PortA:
            ch_base = 0;
            irq_n = PORTA_IRQn;
            vector = (uint32_t)gpio_irqA;
            break;
        case PortB:
            ch_base = 32;
            irq_n = PORTB_IRQn;
            vector = (uint32_t)gpio_irqB;
            break;
        case PortC:
            ch_base = 64;
            irq_n = PORTC_IRQn;
            vector = (uint32_t)gpio_irqC;
            break;
        case PortD:
            ch_base = 96;
            irq_n = PORTD_IRQn;
            vector = (uint32_t)gpio_irqD;
            break;
        case PortE:
            ch_base = 128;
            irq_n = PORTE_IRQn;
            vector = (uint32_t)gpio_irqE;
            break;

        default:
            error("gpio_irq only supported on port A-E.");
            break;
    }
    NVIC_SetVector(irq_n, vector);
    NVIC_EnableIRQ(irq_n);

    obj->ch = ch_base + obj->pin;
    channel_ids[obj->ch] = id;

    return 0;
}

void gpio_irq_free(gpio_irq_t *obj) {
    channel_ids[obj->ch] = 0;
}

void gpio_irq_set(gpio_irq_t *obj, gpio_irq_event event, uint32_t enable) {
    port_interrupt_config_t irq_settings = kPortIntDisabled;

    switch (BR_PORT_PCRn_IRQC(obj->port, obj->pin)) {
        case IRQ_DISABLED:
            if (enable)
                irq_settings = (event == IRQ_RISE) ? (kPortIntRisingEdge) : (kPortIntFallingEdge);
            break;

        case IRQ_RAISING_EDGE:
            if (enable) {
                irq_settings = (event == IRQ_RISE) ? (kPortIntRisingEdge) : (kPortIntEitherEdge);
            } else {
                if (event == IRQ_FALL)
                    irq_settings = kPortIntRisingEdge;
            }
            break;

        case IRQ_FALLING_EDGE:
            if (enable) {
                irq_settings = (event == IRQ_FALL) ? (kPortIntFallingEdge) : (kPortIntEitherEdge);
            } else {
                if (event == IRQ_RISE)
                    irq_settings = kPortIntFallingEdge;
            }
            break;

        case IRQ_EITHER_EDGE:
            if (enable) {
                irq_settings = kPortIntEitherEdge;
            } else {
                irq_settings = (event == IRQ_RISE) ? (kPortIntFallingEdge) : (kPortIntRisingEdge);
            }
            break;
    }

    port_hal_configure_pin_interrupt(obj->port, obj->pin, irq_settings);
    port_hal_clear_pin_interrupt_flag(obj->port, obj->pin);
}

void gpio_irq_enable(gpio_irq_t *obj) {
    switch (obj->port) {
        case PortA:
            NVIC_EnableIRQ(PORTA_IRQn);
            break;
        case PortB:
            NVIC_EnableIRQ(PORTB_IRQn);
            break;
        case PortC:
            NVIC_EnableIRQ(PORTC_IRQn);
            break;
        case PortD:
            NVIC_EnableIRQ(PORTD_IRQn);
            break;
        case PortE:
            NVIC_EnableIRQ(PORTE_IRQn);
            break;
    }
}

void gpio_irq_disable(gpio_irq_t *obj) {
    switch (obj->port) {
        case PortA:
            NVIC_DisableIRQ(PORTA_IRQn);
            break;
        case PortB:
            NVIC_DisableIRQ(PORTB_IRQn);
            break;
        case PortC:
            NVIC_DisableIRQ(PORTC_IRQn);
            break;
        case PortD:
            NVIC_DisableIRQ(PORTD_IRQn);
            break;
        case PortE:
            NVIC_DisableIRQ(PORTE_IRQn);
            break;
    }
}

