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/*
* serial.c UART driver
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2013-03-30 Bernard the first verion
*/
#include <rthw.h>
#include <rtdevice.h>
#include "board.h"
#include "mmu.h"
struct hw_uart_device
{
rt_size_t hw_base;
rt_size_t irqno;
};
#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
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);
}
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;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
UART_IMSC(uart->hw_base) &= ~UARTIMSC_RXIM;
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
UART_IMSC(uart->hw_base) |= UARTIMSC_RXIM;
rt_hw_interrupt_umask(uart->irqno);
break;
default:
return -1;
}
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 (UART_FR(uart->hw_base) & UARTFR_TXFF);
UART_DR(uart->hw_base) = c;
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 const struct rt_uart_ops _uart_ops =
{
uart_configure,
uart_control,
uart_putc,
uart_getc,
};
#ifdef RT_USING_UART0
/* UART device driver structure */
static struct hw_uart_device _uart0_device =
{
PL011_UART0_BASE,
PL011_UART0_IRQNUM,
};
static struct rt_serial_device _serial0;
#endif
int rt_hw_uart_init(void)
{
struct hw_uart_device *uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#ifdef RT_USING_UART0
_uart0_device.hw_base = (rt_size_t)rt_ioremap((void*)_uart0_device.hw_base, PL011_UART0_SIZE);
uart = &_uart0_device;
_serial0.ops = &_uart_ops;
_serial0.config = config;
/* register UART1 device */
rt_hw_serial_register(&_serial0, "uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, &_serial0, "uart0");
/* enable Rx and Tx of UART */
UART_CR(uart->hw_base) = (1 << 0) | (1 << 8) | (1 << 9);
#endif
return 0;
}
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