/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author            Notes
 * 2021-08-23     lianzhian        first implementation.
 */
#include <rtthread.h>
#include <board.h>
#include "drv_gpio.h"
#include <rtdevice.h>
#include <rthw.h>
#include "gd32f10x.h"
#include "gd32f10x_exti.h"

#ifdef RT_USING_PIN

#define __GD32_PIN(index, port, pin) {index, RCU_GPIO##port, GPIO##port, \
        GPIO_PIN_##pin, GPIO_PORT_SOURCE_GPIO##port, GPIO_PIN_SOURCE_##pin}
#define __GD32_PIN_DEFAULT {-1, (rcu_periph_enum)0, 0, 0, 0, 0}

/* GD32 GPIO driver */
struct pin_index
{
    rt_int16_t index;
    rcu_periph_enum clk;
    rt_uint32_t gpio_periph;
    rt_uint32_t pin;
    rt_uint8_t port_src;
    rt_uint8_t pin_src;
};

static const struct pin_index pins[] =
{
    __GD32_PIN(0 ,  A, 0 ),
    __GD32_PIN(1 ,  A, 1 ),
    __GD32_PIN(2 ,  A, 2 ),
    __GD32_PIN(3 ,  A, 3 ),
    __GD32_PIN(4 ,  A, 4 ),
    __GD32_PIN(5 ,  A, 5 ),
    __GD32_PIN(6 ,  A, 6 ),
    __GD32_PIN(7 ,  A, 7 ),
    __GD32_PIN(8 ,  A, 8 ),
    __GD32_PIN(9 ,  A, 9 ),
    __GD32_PIN(10,  A, 10),
    __GD32_PIN(11,  A, 11),
    __GD32_PIN(12,  A, 12),
    __GD32_PIN(13,  A, 13),
    __GD32_PIN(14,  A, 14),
    __GD32_PIN(15,  A, 15),

    __GD32_PIN(16,  B, 0),
    __GD32_PIN(17,  B, 1),
    __GD32_PIN(18,  B, 2),
    __GD32_PIN(19,  B, 3),
    __GD32_PIN(20,  B, 4),
    __GD32_PIN(21,  B, 5),
    __GD32_PIN(22,  B, 6),
    __GD32_PIN(23,  B, 7),
    __GD32_PIN(24,  B, 8),
    __GD32_PIN(25,  B, 9),
    __GD32_PIN(26,  B, 10),
    __GD32_PIN(27,  B, 11),
    __GD32_PIN(28,  B, 12),
    __GD32_PIN(29,  B, 13),
    __GD32_PIN(30,  B, 14),
    __GD32_PIN(31,  B, 15),

    __GD32_PIN(32,  C, 0),
    __GD32_PIN(33,  C, 1),
    __GD32_PIN(34,  C, 2),
    __GD32_PIN(35,  C, 3),
    __GD32_PIN(36,  C, 4),
    __GD32_PIN(37,  C, 5),
    __GD32_PIN(38,  C, 6),
    __GD32_PIN(39,  C, 7),
    __GD32_PIN(40,  C, 8),
    __GD32_PIN(41,  C, 9),
    __GD32_PIN(42,  C, 10),
    __GD32_PIN(43,  C, 11),
    __GD32_PIN(44,  C, 12),
    __GD32_PIN(45,  C, 13),
    __GD32_PIN(46,  C, 14),
    __GD32_PIN(47,  C, 15),

    __GD32_PIN(48,  D, 0),
    __GD32_PIN(49,  D, 1),
    __GD32_PIN(50,  D, 2),
    __GD32_PIN(51,  D, 3),
    __GD32_PIN(52,  D, 4),
    __GD32_PIN(53,  D, 5),
    __GD32_PIN(54,  D, 6),
    __GD32_PIN(55,  D, 7),
    __GD32_PIN(56,  D, 8),
    __GD32_PIN(57,  D, 9),
    __GD32_PIN(58,  D, 10),
    __GD32_PIN(59,  D, 11),
    __GD32_PIN(60,  D, 12),
    __GD32_PIN(61,  D, 13),
    __GD32_PIN(62,  D, 14),
    __GD32_PIN(63,  D, 15),

    __GD32_PIN(64,  E, 0),
    __GD32_PIN(65,  E, 1),
    __GD32_PIN(66,  E, 2),
    __GD32_PIN(67,  E, 3),
    __GD32_PIN(68,  E, 4),
    __GD32_PIN(69,  E, 5),
    __GD32_PIN(70,  E, 6),
    __GD32_PIN(71,  E, 7),
    __GD32_PIN(72,  E, 8),
    __GD32_PIN(73,  E, 9),
    __GD32_PIN(74,  E, 10),
    __GD32_PIN(75,  E, 11),
    __GD32_PIN(76,  E, 12),
    __GD32_PIN(77,  E, 13),
    __GD32_PIN(78,  E, 14),
    __GD32_PIN(79,  E, 15),

    __GD32_PIN(80,  F, 0),
    __GD32_PIN(81,  F, 1),
    __GD32_PIN(82,  F, 2),
    __GD32_PIN(83,  F, 3),
    __GD32_PIN(84,  F, 4),
    __GD32_PIN(85,  F, 5),
    __GD32_PIN(86,  F, 6),
    __GD32_PIN(87,  F, 7),
    __GD32_PIN(88,  F, 8),
    __GD32_PIN(89,  F, 9),
    __GD32_PIN(90,  F, 10),
    __GD32_PIN(91,  F, 11),
    __GD32_PIN(92,  F, 12),
    __GD32_PIN(93,  F, 13),
    __GD32_PIN(94,  F, 14),
    __GD32_PIN(95,  F, 15),

    __GD32_PIN(96,  G, 0),
    __GD32_PIN(97,  G, 1),
    __GD32_PIN(98,  G, 2),
    __GD32_PIN(99,  G, 3),
    __GD32_PIN(100, G, 4),
    __GD32_PIN(101, G, 5),
    __GD32_PIN(102, G, 6),
    __GD32_PIN(103, G, 7),
    __GD32_PIN(104, G, 8),
    __GD32_PIN(105, G, 9),
    __GD32_PIN(106, G, 10),
    __GD32_PIN(107, G, 11),
    __GD32_PIN(108, G, 12),
    __GD32_PIN(109, G, 13),
    __GD32_PIN(110, G, 14),
    __GD32_PIN(111, G, 15),


};

struct pin_irq_map
{
    rt_uint16_t pinbit;
    IRQn_Type irqno;
};
static const struct pin_irq_map pin_irq_map[] =
{
    {GPIO_PIN_0, EXTI0_IRQn},
    {GPIO_PIN_1, EXTI1_IRQn},
    {GPIO_PIN_2, EXTI2_IRQn},
    {GPIO_PIN_3, EXTI3_IRQn},
    {GPIO_PIN_4, EXTI4_IRQn},
    {GPIO_PIN_5, EXTI5_9_IRQn},
    {GPIO_PIN_6, EXTI5_9_IRQn},
    {GPIO_PIN_7, EXTI5_9_IRQn},
    {GPIO_PIN_8, EXTI5_9_IRQn},
    {GPIO_PIN_9, EXTI5_9_IRQn},
    {GPIO_PIN_10, EXTI10_15_IRQn},
    {GPIO_PIN_11, EXTI10_15_IRQn},
    {GPIO_PIN_12, EXTI10_15_IRQn},
    {GPIO_PIN_13, EXTI10_15_IRQn},
    {GPIO_PIN_14, EXTI10_15_IRQn},
    {GPIO_PIN_15, EXTI10_15_IRQn},
};
struct rt_pin_irq_hdr pin_irq_hdr_tab[] =
{
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
    {-1, 0, RT_NULL, RT_NULL},
};

#define ITEM_NUM(items) sizeof(items) / sizeof(items[0])
const struct pin_index *get_pin(rt_uint8_t pin)
{
    const struct pin_index *index;

    if (pin < ITEM_NUM(pins))
    {
        index = &pins[pin];
        if (index->index == -1)
        index = RT_NULL;
    }
    else
    {
        index = RT_NULL;
    }

    return index;
};

static void _pin_mode(rt_device_t dev, rt_base_t pin, rt_uint8_t mode)
{
    const struct pin_index *index;
    rt_uint32_t pin_mode;
    index = get_pin(pin);
    if (index == RT_NULL)
    {
        return;
    }

    /* GPIO Periph clock enable */
    rcu_periph_clock_enable(index->clk);
    pin_mode = GPIO_MODE_OUT_PP;

   switch(mode)
   {
   case PIN_MODE_OUTPUT:
        /* output setting */
        pin_mode = GPIO_MODE_OUT_PP;
        break;
   case PIN_MODE_OUTPUT_OD:
        /* output setting: od. */
        pin_mode = GPIO_MODE_OUT_OD;
        break;
   case PIN_MODE_INPUT:
        /* input setting: not pull. */
        pin_mode = GPIO_MODE_IN_FLOATING;
        break;
   case PIN_MODE_INPUT_PULLUP:
        /* input setting: pull up. */
        pin_mode = GPIO_MODE_IPU;
        break;
   case PIN_MODE_INPUT_PULLDOWN:
        /* input setting: pull down. */
        pin_mode = GPIO_MODE_IPD;
        break;
   default:
        break;
   }

    gpio_init(index->gpio_periph, pin_mode, GPIO_OSPEED_50MHZ, index->pin);
}

static void _pin_write(rt_device_t dev, rt_base_t pin, rt_uint8_t value)
{
    const struct pin_index *index;

    index = get_pin(pin);
    if (index == RT_NULL)
    {
        return;
    }

    gpio_bit_write(index->gpio_periph, index->pin, (bit_status)value);
}

static rt_int8_t _pin_read(rt_device_t dev, rt_base_t pin)
{
    rt_int8_t value;
    const struct pin_index *index;

    value = PIN_LOW;

    index = get_pin(pin);
    if (index == RT_NULL)
    {
        return value;
    }

    value = gpio_input_bit_get(index->gpio_periph, index->pin);

    return value;
}


rt_inline rt_int32_t bit2bitno(rt_uint32_t bit)
{
    rt_uint8_t i;
    for (i = 0; i < 32; i++)
    {
        if ((0x01 << i) == bit)
        {
            return i;
        }
    }
    return -1;
}
rt_inline const struct pin_irq_map *get_pin_irq_map(rt_uint32_t pinbit)
{
    rt_int32_t mapindex = bit2bitno(pinbit);
    if (mapindex < 0 || mapindex >= ITEM_NUM(pin_irq_map))
    {
        return RT_NULL;
    }
    return &pin_irq_map[mapindex];
};
static rt_err_t _pin_attach_irq(struct rt_device *device, rt_base_t pin,
                              rt_uint8_t mode, void (*hdr)(void *args), void *args)
{
    const struct pin_index *index;
    rt_base_t level;
    rt_int32_t hdr_index = -1;

    index = get_pin(pin);
    if (index == RT_NULL)
    {
        return -RT_EINVAL;
    }
    hdr_index = bit2bitno(index->pin);
    if (hdr_index < 0 || hdr_index >= ITEM_NUM(pin_irq_map))
    {
        return -RT_EINVAL;
    }

    level = rt_hw_interrupt_disable();
    if (pin_irq_hdr_tab[hdr_index].pin == pin &&
        pin_irq_hdr_tab[hdr_index].hdr == hdr &&
        pin_irq_hdr_tab[hdr_index].mode == mode &&
        pin_irq_hdr_tab[hdr_index].args == args)
    {
        rt_hw_interrupt_enable(level);
        return RT_EOK;
    }
    if (pin_irq_hdr_tab[hdr_index].pin != -1)
    {
        rt_hw_interrupt_enable(level);
        return -RT_EFULL;
    }
    pin_irq_hdr_tab[hdr_index].pin = pin;
    pin_irq_hdr_tab[hdr_index].hdr = hdr;
    pin_irq_hdr_tab[hdr_index].mode = mode;
    pin_irq_hdr_tab[hdr_index].args = args;
    rt_hw_interrupt_enable(level);

    return RT_EOK;
}
static rt_err_t _pin_detach_irq(struct rt_device *device, rt_base_t pin)
{
    const struct pin_index *index;
    rt_base_t level;
    rt_int32_t hdr_index = -1;

    index = get_pin(pin);
    if (index == RT_NULL)
    {
        return -RT_EINVAL;
    }
    hdr_index = bit2bitno(index->pin);
    if (hdr_index < 0 || hdr_index >= ITEM_NUM(pin_irq_map))
    {
        return -RT_EINVAL;
    }

    level = rt_hw_interrupt_disable();
    if (pin_irq_hdr_tab[hdr_index].pin == -1)
    {
        rt_hw_interrupt_enable(level);
        return RT_EOK;
    }
    pin_irq_hdr_tab[hdr_index].pin = -1;
    pin_irq_hdr_tab[hdr_index].hdr = RT_NULL;
    pin_irq_hdr_tab[hdr_index].mode = 0;
    pin_irq_hdr_tab[hdr_index].args = RT_NULL;
    rt_hw_interrupt_enable(level);

    return RT_EOK;
}
static rt_err_t _pin_irq_enable(struct rt_device *device, rt_base_t pin, rt_uint8_t enabled)
{
    const struct pin_index *index;
    const struct pin_irq_map *irqmap;
    rt_base_t level;
    rt_int32_t hdr_index = -1;
    exti_trig_type_enum trigger_mode;

    index = get_pin(pin);
    if (index == RT_NULL)
    {
        return -RT_EINVAL;
    }
    if (enabled == PIN_IRQ_ENABLE)
    {
        hdr_index = bit2bitno(index->pin);
        if (hdr_index < 0 || hdr_index >= ITEM_NUM(pin_irq_map))
        {
            return -RT_EINVAL;
        }
        level = rt_hw_interrupt_disable();
        if (pin_irq_hdr_tab[hdr_index].pin == -1)
        {
            rt_hw_interrupt_enable(level);
            return -RT_EINVAL;
        }
        irqmap = &pin_irq_map[hdr_index];

        switch (pin_irq_hdr_tab[hdr_index].mode)
        {
            case PIN_IRQ_MODE_RISING:
                trigger_mode = EXTI_TRIG_RISING;
                break;
            case PIN_IRQ_MODE_FALLING:
                trigger_mode = EXTI_TRIG_FALLING;
                break;
            case PIN_IRQ_MODE_RISING_FALLING:
                trigger_mode = EXTI_TRIG_BOTH;
                break;
            default:
                rt_hw_interrupt_enable(level);
                return -RT_EINVAL;
        }

        rcu_periph_clock_enable(RCU_AF);

        /* enable and set interrupt priority */
        nvic_irq_enable(irqmap->irqno, 5U, 0U);

        /* connect EXTI line to  GPIO pin */
        gpio_exti_source_select(index->port_src, index->pin_src);

        /* configure EXTI line */
        exti_init((exti_line_enum)(index->pin), EXTI_INTERRUPT, trigger_mode);
        exti_interrupt_flag_clear((exti_line_enum)(index->pin));

        rt_hw_interrupt_enable(level);
    }
    else if (enabled == PIN_IRQ_DISABLE)
    {
        irqmap = get_pin_irq_map(index->pin);
        if (irqmap == RT_NULL)
        {
            return -RT_EINVAL;
        }
        nvic_irq_disable(irqmap->irqno);
    }
    else
    {
        return -RT_EINVAL;
    }

    return RT_EOK;
}
const static struct rt_pin_ops _gd32_pin_ops =
{
    _pin_mode,
    _pin_write,
    _pin_read,
    _pin_attach_irq,
    _pin_detach_irq,
    _pin_irq_enable,
    RT_NULL,
};

int rt_hw_pin_init(void)
{
    int result;

    result = rt_device_pin_register("pin", &_gd32_pin_ops, RT_NULL);

    return result;
}
INIT_BOARD_EXPORT(rt_hw_pin_init);

rt_inline void pin_irq_hdr(int irqno)
{
    if (pin_irq_hdr_tab[irqno].hdr)
    {
        pin_irq_hdr_tab[irqno].hdr(pin_irq_hdr_tab[irqno].args);
    }
}

void GD32_GPIO_EXTI_IRQHandler(rt_int8_t exti_line)
{
    if(RESET != exti_interrupt_flag_get((exti_line_enum)(1 << exti_line)))
    {
        pin_irq_hdr(exti_line);
        exti_interrupt_flag_clear((exti_line_enum)(1 << exti_line));
    }
}
void EXTI0_IRQHandler(void)
{
    rt_interrupt_enter();
    GD32_GPIO_EXTI_IRQHandler(0);
    rt_interrupt_leave();
}
void EXTI1_IRQHandler(void)
{
    rt_interrupt_enter();
    GD32_GPIO_EXTI_IRQHandler(1);
    rt_interrupt_leave();
}
void EXTI2_IRQHandler(void)
{
    rt_interrupt_enter();
    GD32_GPIO_EXTI_IRQHandler(2);
    rt_interrupt_leave();
}
void EXTI3_IRQHandler(void)
{
    rt_interrupt_enter();
    GD32_GPIO_EXTI_IRQHandler(3);
    rt_interrupt_leave();
}
void EXTI4_IRQHandler(void)
{
    rt_interrupt_enter();
    GD32_GPIO_EXTI_IRQHandler(4);
    rt_interrupt_leave();
}
void EXTI5_9_IRQHandler(void)
{
    rt_interrupt_enter();
    GD32_GPIO_EXTI_IRQHandler(5);
    GD32_GPIO_EXTI_IRQHandler(6);
    GD32_GPIO_EXTI_IRQHandler(7);
    GD32_GPIO_EXTI_IRQHandler(8);
    GD32_GPIO_EXTI_IRQHandler(9);
    rt_interrupt_leave();
}
void EXTI10_15_IRQHandler(void)
{
    rt_interrupt_enter();
    GD32_GPIO_EXTI_IRQHandler(10);
    GD32_GPIO_EXTI_IRQHandler(11);
    GD32_GPIO_EXTI_IRQHandler(12);
    GD32_GPIO_EXTI_IRQHandler(13);
    GD32_GPIO_EXTI_IRQHandler(14);
    GD32_GPIO_EXTI_IRQHandler(15);
    rt_interrupt_leave();
}

#endif