rt-thread-official/bsp/raspberry-pi/raspi4-32/driver/drv_uart.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author         Notes
 * 2020-04-16     bigmagic       first version
 * 2020-05-26     bigmagic       add other uart
 */

#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>

#include "board.h"
#include "drv_uart.h"
#include "drv_gpio.h"

#ifdef RT_USING_UART0
static struct rt_serial_device _serial0;
#endif

#ifdef RT_USING_UART1
static struct rt_serial_device _serial1;
#endif

#ifdef RT_USING_UART3
static struct rt_serial_device _serial3;
#endif

#ifdef RT_USING_UART4
static struct rt_serial_device _serial4;
#endif

#ifdef RT_USING_UART5
static struct rt_serial_device _serial5;
#endif

struct hw_uart_device
{
    rt_ubase_t hw_base;
    rt_uint32_t irqno;
};

static rt_err_t uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
    struct hw_uart_device *uart;
    uint32_t bauddiv = (UART_REFERENCE_CLOCK / cfg->baud_rate)* 1000 / 16;
    uint32_t ibrd = bauddiv / 1000;

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

    if(uart->hw_base == AUX_BASE)
    {
        prev_raspi_pin_mode(GPIO_PIN_14, ALT5);
        prev_raspi_pin_mode(GPIO_PIN_15, ALT5);

        AUX_ENABLES(uart->hw_base)      = 1;    /* Enable UART1 */
        AUX_MU_IER_REG(uart->hw_base)   = 0;    /* Disable interrupt */
        AUX_MU_CNTL_REG(uart->hw_base)  = 0;    /* Disable Transmitter and Receiver */
        AUX_MU_LCR_REG(uart->hw_base)   = 3;    /* Works in 8-bit mode */
        AUX_MU_MCR_REG(uart->hw_base)   = 0;    /* Disable RTS */
        AUX_MU_IIR_REG(uart->hw_base)   = 0xC6; /* Enable FIFO, Clear FIFO */
        AUX_MU_BAUD_REG(uart->hw_base)  = 541;  /* 115200 = system clock 500MHz / (8 * (baud + 1)), baud = 541 */
        AUX_MU_CNTL_REG(uart->hw_base)  = 3;    /* Enable Transmitter and Receiver */
        return RT_EOK;
    }

    if(uart->hw_base == UART0_BASE)
    {
#ifndef BSP_USING_BULETOOTH
        prev_raspi_pin_mode(GPIO_PIN_14, ALT0);
        prev_raspi_pin_mode(GPIO_PIN_15, ALT0);
#else
        prev_raspi_pin_mode(GPIO_PIN_30, ALT3);
        prev_raspi_pin_mode(GPIO_PIN_31, ALT3);
        prev_raspi_pin_mode(GPIO_PIN_32, ALT3);
        prev_raspi_pin_mode(GPIO_PIN_33, ALT3);
#endif
    }

    if(uart->hw_base == UART3_BASE)
    {
        prev_raspi_pin_mode(GPIO_PIN_4, ALT4);
        prev_raspi_pin_mode(GPIO_PIN_5, ALT4);
    }

    if(uart->hw_base == UART4_BASE)
    {
        prev_raspi_pin_mode(GPIO_PIN_8, ALT4);
        prev_raspi_pin_mode(GPIO_PIN_9, ALT4);
    }

    if(uart->hw_base == UART5_BASE)
    {
        prev_raspi_pin_mode(GPIO_PIN_12, ALT4);
        prev_raspi_pin_mode(GPIO_PIN_13, ALT4);
    }

    PL011_REG_IMSC(uart->hw_base) = 0;     /* mask all interrupt */
    PL011_REG_ICR(uart->hw_base) = 0x7ff;  /* clear all interrupt */
    //PL011 clock 480MHz 480x10^6/baudrate/16
    PL011_REG_IBRD(uart->hw_base) = ibrd;
    PL011_REG_FBRD(uart->hw_base) = (((bauddiv - ibrd * 1000) * 64 + 500) / 1000);
#ifdef BSP_USING_BULETOOTH
    PL011_REG_IFLS(uart->hw_base) = 0x08;
    PL011_REG_LCRH(uart->hw_base) = 0x70;
    PL011_REG_CR(uart->hw_base) = PL011_CR_UARTEN | PL011_CR_TXE | PL011_CR_RXE | PL011_CR_RTS;
#else
    PL011_REG_IFLS(uart->hw_base) = 0x0;
    PL011_REG_LCRH(uart->hw_base) = PL011_LCRH_WLEN_8;
    PL011_REG_CR(uart->hw_base) = PL011_CR_UARTEN | PL011_CR_TXE | PL011_CR_RXE;
#endif
    PL011_REG_IMSC(uart->hw_base) = 0;
    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;

    switch (cmd)
    {
    case RT_DEVICE_CTRL_CLR_INT:
        /* disable rx irq */
        if(uart->hw_base == AUX_BASE)
        {
            AUX_MU_IER_REG(uart->hw_base) = 0x0;
        }
        else
        {
            PL011_REG_IMSC(uart->hw_base) &= ~((uint32_t)PL011_IMSC_RXIM);
        }
        rt_hw_interrupt_mask(uart->irqno);
        break;

    case RT_DEVICE_CTRL_SET_INT:
        /* enable rx irq */
        if(uart->hw_base == AUX_BASE)
        {
            AUX_MU_IER_REG(uart->hw_base) = 0x1;
        }
        else
        {
            PL011_REG_IMSC(uart->hw_base) |= PL011_IMSC_RXIM;
        }
        rt_hw_interrupt_umask(uart->irqno);
        break;
    }
    return RT_EOK;
}

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

    RT_ASSERT(serial != RT_NULL);
    uart = (struct hw_uart_device *)serial->parent.user_data;
    if(uart->hw_base == AUX_BASE)
    {
        while (!(AUX_MU_LSR_REG(uart->hw_base) & 0x20));
        AUX_MU_IO_REG(uart->hw_base) = c;
    }
    else
    {
        while ((PL011_REG_FR(uart->hw_base) & PL011_FR_TXFF));
        PL011_REG_DR(uart->hw_base) = (uint8_t)c;
    }
    return 1;
}

static int uart_getc(struct rt_serial_device *serial)
{
    int ch = -1;
    struct hw_uart_device *uart;

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

    if(uart->hw_base == AUX_BASE)
    {
        if ((AUX_MU_LSR_REG(uart->hw_base) & 0x01))
        {
            ch = AUX_MU_IO_REG(uart->hw_base) & 0xff;
        }
    }
    else
    {
        if((PL011_REG_FR(uart->hw_base) & PL011_FR_RXFE) == 0)
        {
            ch = PL011_REG_DR(uart->hw_base) & 0xff;
        }
    }

    return ch;
}

static const struct rt_uart_ops _uart_ops =
{
    uart_configure,
    uart_control,
    uart_putc,
    uart_getc,
};

#ifdef RT_USING_UART1
static void rt_hw_aux_uart_isr(int irqno, void *param)
{
    struct rt_serial_device *serial = (struct rt_serial_device*)param;
    rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
#endif

static void rt_hw_uart_isr(int irqno, void *param)
{
#ifdef RT_USING_UART0
    if((PACTL_CS & IRQ_UART0) == IRQ_UART0)
    {
        PACTL_CS &=  ~(IRQ_UART0);
        rt_hw_serial_isr(&_serial0, RT_SERIAL_EVENT_RX_IND);
        PL011_REG_ICR(UART0_BASE) = PL011_INTERRUPT_RECEIVE;
    }
#endif

#ifdef RT_USING_UART3
    if((PACTL_CS & IRQ_UART3) == IRQ_UART3)
    {
        PACTL_CS &=  ~(IRQ_UART3);
        rt_hw_serial_isr(&_serial3, RT_SERIAL_EVENT_RX_IND);
        PL011_REG_ICR(UART3_BASE) = PL011_INTERRUPT_RECEIVE;
    }
#endif

#ifdef RT_USING_UART4
    if((PACTL_CS & IRQ_UART4) == IRQ_UART4)
    {
        PACTL_CS &=  ~(IRQ_UART4);
        rt_hw_serial_isr(&_serial4, RT_SERIAL_EVENT_RX_IND);
        PL011_REG_ICR(UART4_BASE) = PL011_INTERRUPT_RECEIVE;
    }
#endif

#ifdef RT_USING_UART5
    if((PACTL_CS & IRQ_UART5) == IRQ_UART5)
    {
        PACTL_CS &=  ~(IRQ_UART5);
        rt_hw_serial_isr(&_serial5, RT_SERIAL_EVENT_RX_IND);
        PL011_REG_ICR(UART5_BASE) = PL011_INTERRUPT_RECEIVE;
    }
#endif
}

#ifdef RT_USING_UART0
/* UART device driver structure */
static struct hw_uart_device _uart0_device =
{
    UART0_BASE,
    IRQ_PL011,
};
#endif

#ifdef RT_USING_UART1
/* UART device driver structure */
static struct hw_uart_device _uart1_device =
{
    AUX_BASE,
    IRQ_AUX_UART,
};
#endif

#ifdef RT_USING_UART3
static struct hw_uart_device _uart3_device =
{
    UART3_BASE,
    IRQ_PL011,
};
#endif

#ifdef RT_USING_UART4
static struct hw_uart_device _uart4_device =
{
    UART4_BASE,
    IRQ_PL011,
};
#endif

#ifdef RT_USING_UART5
static struct hw_uart_device _uart5_device =
{
    UART5_BASE,
    IRQ_PL011,
};
#endif

int rt_hw_uart_init(void)
{
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#ifdef RT_USING_UART0
    struct hw_uart_device *uart0;
    uart0 = &_uart0_device;

    _serial0.ops    = &_uart_ops;
    _serial0.config = config;

    /* register UART0 device */
    rt_hw_serial_register(&_serial0, "uart0",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart0);
    rt_hw_interrupt_install(uart0->irqno, rt_hw_uart_isr, &_serial0, "uart0");
#endif

#ifdef RT_USING_UART1
    struct hw_uart_device *uart1;
    uart1 = &_uart1_device;

    _serial1.ops    = &_uart_ops;
    _serial1.config = config;

    /* register UART1 device */
    rt_hw_serial_register(&_serial1, "uart1",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart1);
    rt_hw_interrupt_install(uart1->irqno, rt_hw_aux_uart_isr, &_serial1, "uart1");
#endif

#ifdef RT_USING_UART3
    struct hw_uart_device *uart3;
    uart3 = &_uart3_device;

    _serial3.ops    = &_uart_ops;
    _serial3.config = config;

    /* register UART3 device */
    rt_hw_serial_register(&_serial3, "uart3",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart3);
    rt_hw_interrupt_install(uart3->irqno, rt_hw_uart_isr, &_serial3, "uart3");
#endif

#ifdef RT_USING_UART4
    struct hw_uart_device *uart4;
    uart4 = &_uart4_device;

    _serial4.ops    = &_uart_ops;
    _serial4.config = config;

    /* register UART4 device */
    rt_hw_serial_register(&_serial4, "uart4",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart4);
    rt_hw_interrupt_install(uart4->irqno, rt_hw_uart_isr, &_serial4, "uart4");
#endif

#ifdef RT_USING_UART5
    struct hw_uart_device *uart5;
    uart5 = &_uart5_device;

    _serial5.ops    = &_uart_ops;
    _serial5.config = config;

    /* register UART5 device */
    rt_hw_serial_register(&_serial5, "uart5",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          uart5);
    rt_hw_interrupt_install(uart5->irqno, rt_hw_uart_isr, &_serial5, "uart5");
#endif
    return 0;
}