rt-thread/bsp/qemu-vexpress-a9/drivers/drv_uart_v2.c

/*
 * Copyright (c) 2006-2025 RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2025-04-08     Hydevcode   the first version
 */
#include <rtthread.h>
#include <rtdevice.h>
#include <rtdbg.h>
#include "board.h"
#include "drv_uart_v2.h"
#include "mmu.h"

#ifdef RT_USING_SERIAL_V2

#include <rtdbg.h>

#if !defined(BSP_USING_UART0) && !defined(BSP_USING_UART1) && !defined(BSP_USING_UART2) &&  !defined(BSP_USING_UART3)
    #error "Please define at least one BSP_USING_UARTx"
    /* this driver can be disabled at menuconfig -> RT-Thread Components -> Device Drivers */
#endif

struct hw_uart_device
{
    rt_uint32_t hw_base;
    rt_uint32_t irqno;
    struct rt_serial_device *serial;
    char *device_name;
};

#define UART_DR(base)   __REG32(base + 0x00)
#define UART_FR(base)   __REG32(base + 0x18)
#define UART_CR(base)   __REG32(base + 0x30)
#define UART_IMSC(base) __REG32(base + 0x38)
#define UART_ICR(base)  __REG32(base + 0x44)

#define UARTFR_RXFE     0x10
#define UARTFR_TXFF     0x20
#define UARTIMSC_RXIM   0x10
#define UARTIMSC_TXIM   0x20
#define UARTICR_RXIC    0x10
#define UARTICR_TXIC    0x20

#if defined(BSP_USING_UART0)
struct rt_serial_device serial0;
#endif

#if defined(BSP_USING_UART1)
struct rt_serial_device serial1;
#endif

#if defined(BSP_USING_UART2)
struct rt_serial_device serial2;
#endif


#if defined(BSP_USING_UART3)
struct rt_serial_device serial3;
#endif

static struct hw_uart_device _uart_device[] = {
#if defined(BSP_USING_UART0)
{
    REALVIEW_UART0_BASE,
    IRQ_PBA8_UART0,
    &serial0,
    "uart0",
},
#endif

#if defined(BSP_USING_UART1)
{
    REALVIEW_UART1_BASE,
    IRQ_PBA8_UART1,
    &serial1,
    "uart1",
},
#endif

#if defined(BSP_USING_UART2)
{
    REALVIEW_UART2_BASE,
    IRQ_PBA8_UART2,
    &serial2,
    "uart2",
},
#endif

#if defined(BSP_USING_UART3)
{
    REALVIEW_UART3_BASE,
    IRQ_PBA8_UART3,
    &serial3,
    "uart3",
},
#endif

};

/**
 * @brief UART common interrupt process. This
 *
 * @param serial Serial device
 */
static void rt_hw_uart_isr(int irqno, void *param)
{
    struct rt_serial_device *serial = (struct rt_serial_device *)param;
    struct hw_uart_device *uart;
    RT_ASSERT(serial != RT_NULL);
    uart = (struct hw_uart_device *)serial->parent.user_data;
    struct rt_serial_rx_fifo *rx_fifo;
    rx_fifo = (struct rt_serial_rx_fifo *) serial->serial_rx;
    RT_ASSERT(rx_fifo != RT_NULL);
    rt_ringbuffer_putchar(&(rx_fifo->rb), UART_DR(uart->hw_base));
    rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}

static rt_err_t uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
    return RT_EOK;
}

static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
    struct hw_uart_device *uart;

    RT_ASSERT(serial != RT_NULL);

    uart = (struct hw_uart_device *)serial->parent.user_data;

    rt_ubase_t ctrl_arg = (rt_ubase_t) arg;

    if(ctrl_arg & (RT_DEVICE_FLAG_RX_BLOCKING | RT_DEVICE_FLAG_RX_NON_BLOCKING))
    {
        {
            ctrl_arg = RT_DEVICE_FLAG_INT_RX;
        }

    }
    else if(ctrl_arg & (RT_DEVICE_FLAG_TX_BLOCKING | RT_DEVICE_FLAG_TX_NON_BLOCKING))
    {
        {
            ctrl_arg = RT_DEVICE_FLAG_INT_TX;
        }

    }

    switch (cmd)
    {
        case RT_DEVICE_CTRL_CLR_INT:
            if (ctrl_arg == RT_DEVICE_FLAG_INT_RX)
            {
                /* disable rx irq */
                UART_IMSC(uart->hw_base) &= ~UARTIMSC_RXIM;
            }
            else if (ctrl_arg == RT_DEVICE_FLAG_INT_TX)
            {
                /* disable tx irq */
                UART_IMSC(uart->hw_base) &= ~UARTIMSC_TXIM;
            }

            break;

        case RT_DEVICE_CTRL_SET_INT:
            if (ctrl_arg == RT_DEVICE_FLAG_INT_RX)
            {
                /* enable rx irq */
                UART_IMSC(uart->hw_base) |= UARTIMSC_RXIM;
                rt_hw_interrupt_umask(uart->irqno);

            } else if (ctrl_arg == RT_DEVICE_FLAG_INT_TX)
            {
                /* enable tx irq */
                UART_IMSC(uart->hw_base) |= UARTIMSC_TXIM;
                rt_hw_interrupt_umask(uart->irqno);
            }

            break;
        case RT_DEVICE_CTRL_CONFIG:
            uart_control(serial, RT_DEVICE_CTRL_SET_INT, (void *)ctrl_arg);
            break;
    }

    return RT_EOK;
}

static int uart_putc(struct rt_serial_device *serial, char ch)
{
    struct hw_uart_device *uart;

    RT_ASSERT(serial != RT_NULL);

    uart = (struct hw_uart_device *)serial->parent.user_data;

    while (UART_FR(uart->hw_base) & UARTFR_TXFF);
    UART_DR(uart->hw_base) = ch;

    return 1;
}

static int uart_getc(struct rt_serial_device *serial)
{
    int ch;
    struct hw_uart_device *uart;

    RT_ASSERT(serial != RT_NULL);
    uart = (struct hw_uart_device *)serial->parent.user_data;

    ch = -1;
    if (!(UART_FR(uart->hw_base) & UARTFR_RXFE))
    {
        ch = UART_DR(uart->hw_base) & 0xff;
    }

    return ch;
}
static rt_ssize_t uart_transmit(struct rt_serial_device *serial,
                                    rt_uint8_t *buf,
                                    rt_size_t size,
                                    rt_uint32_t tx_flag)
{
    RT_ASSERT(serial != RT_NULL);
    RT_ASSERT(buf != RT_NULL);

    RT_ASSERT(size);

    uart_control(serial, RT_DEVICE_CTRL_SET_INT, (void *)tx_flag);
    return size;
}
static const struct rt_uart_ops _uart_ops = {
    .configure = uart_configure,
    .control = uart_control,
    .putc = uart_putc,
    .getc = uart_getc,
    .transmit = uart_transmit
};

int rt_hw_uart_init(void)
{

    rt_err_t err = RT_EOK;

    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;

    for (uint32_t i = 0; i < sizeof(_uart_device) / sizeof(_uart_device[0]); i++)
    {

        #ifdef RT_USING_SMART
            _uart_device[i].hw_base = (uint32_t)rt_ioremap((void*)_uart_device[i].hw_base, 0x1000);
        #endif

        _uart_device[i].serial->ops = &_uart_ops;
        _uart_device[i].serial->config = config;
        _uart_device[i].serial->config.rx_bufsz = 64;
        _uart_device[i].serial->config.tx_bufsz = 0;
        /* register UART device */
        err = rt_hw_serial_register(_uart_device[i].serial,
                            _uart_device[i].device_name,
                            RT_DEVICE_FLAG_RDWR,
                            (void*)&_uart_device[i]);
        rt_hw_interrupt_install(_uart_device[i].irqno, rt_hw_uart_isr, _uart_device[i].serial, _uart_device[i].device_name);
        /* enable Rx and Tx of UART */
        UART_CR(_uart_device[i].hw_base) = (1 << 0) | (1 << 8) | (1 << 9);
    }

    return err;
}
INIT_BOARD_EXPORT(rt_hw_uart_init);
#endif /* RT_USING_SERIAL_V2 */