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/*
* Copyright (c) 2006-2020, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-04-16 bigmagic first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "board.h"
#include "drv_uart.h"
#include "drv_gpio.h"
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 == PL011_BASE)
{
uint32_t gpfsel = 0;
gpfsel &= ~((uint32_t)(0x07 << (4 * 3)));
gpfsel |= (uint32_t)(ALT0 << (4 * 3));
GPIO_REG_GPFSEL1(GPIO_BASE) = gpfsel;
gpfsel &= ~((uint32_t)(0x07 << (5 * 3)));
gpfsel |= (uint32_t)(ALT0 << (5 * 3));
GPIO_REG_GPFSEL1(GPIO_BASE) = gpfsel;
PL011_REG_CR(uart->hw_base) = 0;/*Clear UART setting*/
PL011_REG_LCRH(uart->hw_base) = 0;/*disable FIFO*/
PL011_REG_IBRD(uart->hw_base) = ibrd;
PL011_REG_FBRD(uart->hw_base) = (((bauddiv - ibrd * 1000) * 64 + 500) / 1000);
PL011_REG_LCRH(uart->hw_base) = PL011_LCRH_WLEN_8;/*FIFO*/
PL011_REG_CR(uart->hw_base) = PL011_CR_UARTEN | PL011_CR_TXE | PL011_CR_RXE;/*art enable, TX/RX enable*/
}
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 */
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 */
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;
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((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,
};
static void rt_hw_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);
PL011_REG_ICR(UART0_BASE) = PL011_INTERRUPT_RECEIVE;
}
/* UART device driver structure */
static struct hw_uart_device _uart0_device =
{
PL011_BASE,
IRQ_PL011,
};
static struct rt_serial_device _serial0;
int rt_hw_uart_init(void)
{
struct hw_uart_device *uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
uart = &_uart0_device;
_serial0.ops = &_uart_ops;
_serial0.config = config;
/* register UART1 device */
rt_hw_serial_register(&_serial0, "uart",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, &_serial0, "uart");
return 0;
}
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