148 lines
3.3 KiB
C
148 lines
3.3 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2018/5/5 Bernard The first version
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <rtdevice.h>
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#include "board.h"
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#define PL011_UARTDR 0x000
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#define PL011_UARTFR 0x018
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#define PL011_UARTFR_TXFF_BIT 5
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unsigned int readl(volatile void *addr)
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{
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return *(volatile unsigned int *)addr;
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}
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void writel(unsigned int v, volatile void *addr)
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{
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*(volatile unsigned int *)addr = v;
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}
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struct hw_uart_device
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{
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rt_ubase_t hw_base;
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rt_uint32_t irqno;
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};
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static rt_err_t uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
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{
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return RT_EOK;
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}
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static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg)
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{
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struct hw_uart_device *uart;
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uint32_t val;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct hw_uart_device *)serial->parent.user_data;
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switch (cmd)
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{
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case RT_DEVICE_CTRL_CLR_INT:
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/* disable rx irq */
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val = readl((volatile void *)(uart->hw_base + 0x38));
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val &= ~0x10;
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writel(val, (volatile void *)(uart->hw_base + 0x38));
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rt_hw_interrupt_mask(uart->irqno);
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break;
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case RT_DEVICE_CTRL_SET_INT:
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/* enable rx irq */
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val = readl((volatile void *)(uart->hw_base + 0x38));
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val |= 0x10;
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writel(val, (volatile void *)(uart->hw_base + 0x38));
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rt_hw_interrupt_umask(uart->irqno);
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break;
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}
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return RT_EOK;
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}
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static int uart_putc(struct rt_serial_device *serial, char c)
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{
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struct hw_uart_device *uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct hw_uart_device *)serial->parent.user_data;
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while (readl((volatile void *)(uart->hw_base + PL011_UARTFR)) & (1 << PL011_UARTFR_TXFF_BIT))
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{
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}
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writel(c, (volatile void *)( uart->hw_base + PL011_UARTDR));
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return 1;
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}
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static int uart_getc(struct rt_serial_device *serial)
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{
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int ch = -1;
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struct hw_uart_device *uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct hw_uart_device *)serial->parent.user_data;
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if (!(readl((volatile void *)(uart->hw_base + 0x18)) & (1 << 4)))
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{
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ch = readl((volatile void *)(uart->hw_base));
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}
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return ch;
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}
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static const struct rt_uart_ops _uart_ops =
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{
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uart_configure,
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uart_control,
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uart_putc,
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uart_getc,
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};
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static void rt_hw_uart_isr(int irqno, void *param)
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{
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struct rt_serial_device *serial = (struct rt_serial_device*)param;
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rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
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}
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#ifdef RT_USING_UART0
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/* UART device driver structure */
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static struct hw_uart_device _uart0_device =
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{
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PL011_UART0_BASE,
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PL011_UART0_IRQNUM,
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};
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static struct rt_serial_device _serial0;
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#endif
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int rt_hw_uart_init(void)
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{
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struct hw_uart_device *uart;
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struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
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#ifdef RT_USING_UART0
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uart = &_uart0_device;
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_serial0.ops = &_uart_ops;
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_serial0.config = config;
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/* register UART1 device */
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rt_hw_serial_register(&_serial0, "uart0",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
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uart);
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rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, &_serial0, "uart0");
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#endif
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return 0;
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}
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