/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-05-11     shelton      first version
 */

#include "board.h"
#include "drv_usart.h"

#ifdef RT_USING_SERIAL
#if !defined(BSP_USING_UART1) && !defined(BSP_USING_UART2) && \
    !defined(BSP_USING_UART3) && !defined(BSP_USING_UART4) && \
    !defined(BSP_USING_UART5)
    #error "Please define at least one BSP_USING_UARTx"
#endif

struct at32_usart {
    char *name;
    usart_type* usart_x;
    IRQn_Type irqn;
    struct rt_serial_device serial;
};

enum {
#ifdef BSP_USING_UART1
    UART1_INDEX,
#endif
#ifdef BSP_USING_UART2
    UART2_INDEX,
#endif
#ifdef BSP_USING_UART3
    UART3_INDEX,
#endif
#ifdef BSP_USING_UART4
    UART4_INDEX,
#endif
#ifdef BSP_USING_UART5
    UART5_INDEX,
#endif
};

static struct at32_usart usart_config[] = {
#ifdef BSP_USING_UART1
        { "uart1",
        USART1,
        USART1_IRQn, },
#endif
#ifdef BSP_USING_UART2
        { "uart2",
        USART2,
        USART2_IRQn, },
#endif
#ifdef BSP_USING_UART3
        { "uart3",
        USART3,
        USART3_IRQn, },
#endif
#ifdef BSP_USING_UART4
        { "uart4",
        UART4,
        UART4_IRQn, },
#endif
#ifdef BSP_USING_UART5
        { "uart5",
        UART5,
        UART5_IRQn, },
#endif
};

static rt_err_t at32_configure(struct rt_serial_device *serial,
    struct serial_configure *cfg) {
    struct at32_usart *usart_instance = (struct at32_usart *) serial->parent.user_data;
    usart_data_bit_num_type data_bit;
    usart_stop_bit_num_type stop_bit;
    usart_parity_selection_type parity_mode;

    RT_ASSERT(serial != RT_NULL);
    RT_ASSERT(cfg != RT_NULL);

    RT_ASSERT(usart_instance != RT_NULL);

    at32_msp_usart_init((void *)usart_instance->usart_x);

    usart_receiver_enable(usart_instance->usart_x, TRUE);
    usart_transmitter_enable(usart_instance->usart_x, TRUE);

    usart_hardware_flow_control_set(usart_instance->usart_x, USART_HARDWARE_FLOW_NONE);

    switch (cfg->data_bits) {
    case DATA_BITS_8:
        data_bit = USART_DATA_8BITS;
        break;
    case DATA_BITS_9:
        data_bit = USART_DATA_9BITS;
        break;
    default:
        data_bit = USART_DATA_8BITS;
        break;
    }

    switch (cfg->stop_bits) {
    case STOP_BITS_1:
        stop_bit = USART_STOP_1_BIT;
        break;
    case STOP_BITS_2:
        stop_bit = USART_STOP_2_BIT;
        break;
    default:
        stop_bit = USART_STOP_1_BIT;
        break;
    }

    switch (cfg->parity) {
    case PARITY_NONE:
        parity_mode = USART_PARITY_NONE;
        break;
    case PARITY_ODD:
        parity_mode = USART_PARITY_ODD;
        break;
    case PARITY_EVEN:
        parity_mode = USART_PARITY_EVEN;
        break;
    default:
        parity_mode = USART_PARITY_NONE;
        break;
    }
    usart_parity_selection_config(usart_instance->usart_x, parity_mode);
    usart_init(usart_instance->usart_x, cfg->baud_rate, data_bit, stop_bit);
    usart_enable(usart_instance->usart_x, TRUE);

    return RT_EOK;
}

static rt_err_t at32_control(struct rt_serial_device *serial, int cmd, void *arg) {
    struct at32_usart *usart;

    RT_ASSERT(serial != RT_NULL);
    usart = (struct at32_usart *) serial->parent.user_data;
    RT_ASSERT(usart != RT_NULL);

    switch (cmd) {
    case RT_DEVICE_CTRL_CLR_INT:
        nvic_irq_disable(usart->irqn);
        usart_interrupt_enable(usart->usart_x, USART_RDBF_INT, FALSE);
        break;
    case RT_DEVICE_CTRL_SET_INT:
        nvic_irq_enable(usart->irqn, 2, 1);
        usart_interrupt_enable(usart->usart_x, USART_RDBF_INT, TRUE);
        break;
    }

    return RT_EOK;
}

static int at32_putc(struct rt_serial_device *serial, char ch) {
    struct at32_usart *usart;

    RT_ASSERT(serial != RT_NULL);
    usart = (struct at32_usart *) serial->parent.user_data;
    RT_ASSERT(usart != RT_NULL);

    usart_data_transmit(usart->usart_x, (uint8_t)ch);
    while (usart_flag_get(usart->usart_x, USART_TDC_FLAG) == RESET);

    return 1;
}

static int at32_getc(struct rt_serial_device *serial) {
    int ch;
    struct at32_usart *usart;

    RT_ASSERT(serial != RT_NULL);
    usart = (struct at32_usart *) serial->parent.user_data;
    RT_ASSERT(usart != RT_NULL);

    ch = -1;
    if (usart_flag_get(usart->usart_x, USART_RDBF_FLAG) != RESET) {
        ch = usart_data_receive(usart->usart_x) & 0xff;
    }

    return ch;
}

static const struct rt_uart_ops at32_usart_ops = {
    at32_configure,
    at32_control,
    at32_putc,
    at32_getc,
    RT_NULL
};

static void usart_isr(struct rt_serial_device *serial) {
    struct at32_usart *usart_instance;

    RT_ASSERT(serial != RT_NULL);

    usart_instance = (struct at32_usart *) serial->parent.user_data;
    RT_ASSERT(usart_instance != RT_NULL);

    if (usart_flag_get(usart_instance->usart_x, USART_RDBF_FLAG) != RESET) {
        rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
        usart_flag_clear(usart_instance->usart_x, USART_RDBF_FLAG);
    }
    else
    {
        if (usart_flag_get(usart_instance->usart_x, USART_CTSCF_FLAG) != RESET) {
            usart_flag_clear(usart_instance->usart_x, USART_CTSCF_FLAG);
        }

        if (usart_flag_get(usart_instance->usart_x, USART_BFF_FLAG) != RESET) {
            usart_flag_clear(usart_instance->usart_x, USART_BFF_FLAG);
        }

        if (usart_flag_get(usart_instance->usart_x, USART_TDC_FLAG) != RESET) {
            usart_flag_clear(usart_instance->usart_x, USART_TDC_FLAG);
        }
    }
}

#ifdef BSP_USING_UART1
void USART1_IRQHandler(void) {
    rt_interrupt_enter();

    usart_isr(&usart_config[UART1_INDEX].serial);

    rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART2
void USART2_IRQHandler(void) {
    rt_interrupt_enter();

    usart_isr(&usart_config[UART2_INDEX].serial);

    rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART3
void USART3_IRQHandler(void) {
    rt_interrupt_enter();

    usart_isr(&usart_config[UART3_INDEX].serial);

    rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART4
void UART4_IRQHandler(void) {
    rt_interrupt_enter();

    usart_isr(&usart_config[UART4_INDEX].serial);

    rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART5
void UART5_IRQHandler(void) {
    rt_interrupt_enter();

    usart_isr(&usart_config[UART5_INDEX].serial);

    rt_interrupt_leave();
}
#endif

int rt_hw_usart_init(void) {
    rt_size_t obj_num;
    int index;

    obj_num = sizeof(usart_config) / sizeof(struct at32_usart);
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
    rt_err_t result = 0;

    for (index = 0; index < obj_num; index++) {
        usart_config[index].serial.ops = &at32_usart_ops;
        usart_config[index].serial.config = config;

        /* register uart device */
        result = rt_hw_serial_register(&usart_config[index].serial,
                 usart_config[index].name,
                 RT_DEVICE_FLAG_RDWR |
                 RT_DEVICE_FLAG_INT_RX |
                 RT_DEVICE_FLAG_INT_TX,
                 &usart_config[index]);
        RT_ASSERT(result == RT_EOK);
    }

    return result;
}

#endif /* BSP_USING_SERIAL */