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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018/5/5 Bernard The first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "board.h"
unsigned int readl(volatile void *addr)
{
return *(volatile unsigned int *)addr;
}
void writel(unsigned int v, volatile void *addr)
{
*(volatile unsigned int *)addr = v;
}
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)
{
return RT_EOK;
}
static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct hw_uart_device *uart;
uint32_t val;
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 */
val = readl((volatile void *)(uart->hw_base + 0x38));
val &= ~0x10;
writel(val, (volatile void *)(uart->hw_base + 0x38));
rt_hw_interrupt_mask(uart->irqno);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
val = readl((volatile void *)(uart->hw_base + 0x38));
val |= 0x10;
writel(val, (volatile void *)(uart->hw_base + 0x38));
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 (readl((volatile void *)(uart->hw_base + PL011_UARTFR)) & (1 << PL011_UARTFR_TXFF_BIT))
{
}
writel(c, (volatile void *)( uart->hw_base + PL011_UARTDR));
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 (!(readl((volatile void *)(uart->hw_base + 0x18)) & (1 << 4)))
{
ch = readl((volatile void *)(uart->hw_base));
}
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);
}
#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
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");
#endif
return 0;
}
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