283 lines
7.3 KiB
C
283 lines
7.3 KiB
C
/*
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* Copyright (c) 2006-2024, 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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* 2023/06/25 flyingcys 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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#include "drv_uart.h"
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#define DBG_TAG "DRV.UART"
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#define DBG_LVL DBG_WARNING
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#include <rtdbg.h>
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/*
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* Divide positive or negative dividend by positive divisor and round
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* to closest integer. Result is undefined for negative divisors and
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* for negative dividends if the divisor variable type is unsigned.
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*/
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#define DIV_ROUND_CLOSEST(x, divisor)( \
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{ \
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typeof(x) __x = x; \
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typeof(divisor) __d = divisor; \
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(((typeof(x))-1) > 0 || \
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((typeof(divisor))-1) > 0 || (__x) > 0) ? \
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(((__x) + ((__d) / 2)) / (__d)) : \
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(((__x) - ((__d) / 2)) / (__d)); \
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} \
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)
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#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
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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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#define BSP_DEFINE_UART_DEVICE(no) \
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static struct hw_uart_device _uart##no##_device = \
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{ \
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UART##no##_BASE, \
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UART##no##_IRQ \
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}; \
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static struct rt_serial_device _serial##no;
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#ifdef RT_USING_UART0
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BSP_DEFINE_UART_DEVICE(0);
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#endif
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#ifdef RT_USING_UART1
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BSP_DEFINE_UART_DEVICE(1);
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#endif
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#ifdef RT_USING_UART2
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BSP_DEFINE_UART_DEVICE(2);
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#endif
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#ifdef RT_USING_UART3
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BSP_DEFINE_UART_DEVICE(3);
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#endif
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rt_inline rt_uint32_t dw8250_read32(rt_ubase_t addr, rt_ubase_t offset)
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{
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return *((volatile rt_uint32_t *)(addr + (offset << UART_REG_SHIFT)));
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}
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rt_inline void dw8250_write32(rt_ubase_t addr, rt_ubase_t offset, rt_uint32_t value)
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{
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*((volatile rt_uint32_t *)(addr + (offset << UART_REG_SHIFT))) = value;
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if (offset == UART_LCR)
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{
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int tries = 1000;
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/* Make sure LCR write wasn't ignored */
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while (tries--)
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{
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unsigned int lcr = dw8250_read32(addr, UART_LCR);
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if ((value & ~UART_LCR_STKP) == (lcr & ~UART_LCR_STKP))
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{
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return;
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}
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dw8250_write32(addr, UART_FCR, UART_FCR_DEFVAL);
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dw8250_read32(addr, UART_RX);
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*((volatile rt_uint32_t *)(addr + (offset << UART_REG_SHIFT))) = value;
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}
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}
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}
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static void dw8250_uart_setbrg(rt_ubase_t addr, int baud_divisor)
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{
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/* to keep serial format, read lcr before writing BKSE */
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int lcr_val = dw8250_read32(addr, UART_LCR) & ~UART_LCR_BKSE;
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dw8250_write32(addr, UART_LCR, UART_LCR_BKSE | lcr_val);
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dw8250_write32(addr, UART_DLL, baud_divisor & 0xff);
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dw8250_write32(addr, UART_DLM, (baud_divisor >> 8) & 0xff);
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dw8250_write32(addr, UART_LCR, lcr_val);
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}
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static rt_err_t dw8250_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
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{
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rt_base_t base;
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struct hw_uart_device *uart;
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int clock_divisor;
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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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base = uart->hw_base;
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while (!(dw8250_read32(base, UART_LSR) & UART_LSR_TEMT));
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dw8250_write32(base, UART_IER, 0);
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dw8250_write32(base, UART_MCR, UART_MCRVAL);
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dw8250_write32(base, UART_FCR, UART_FCR_DEFVAL);
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/* initialize serial config to 8N1 before writing baudrate */
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dw8250_write32(base, UART_LCR, UART_LCR_8N1);
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clock_divisor = DIV_ROUND_CLOSEST(UART_INPUT_CLK, 16 * serial->config.baud_rate);
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dw8250_uart_setbrg(base, clock_divisor);
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return RT_EOK;
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}
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static rt_err_t dw8250_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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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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dw8250_write32(uart->hw_base, UART_IER, !UART_IER_RDI);
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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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dw8250_write32(uart->hw_base, UART_IER, UART_IER_RDI);
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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 dw8250_uart_putc(struct rt_serial_device *serial, char c)
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{
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rt_base_t base;
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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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base = uart->hw_base;
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while ((dw8250_read32(base, UART_LSR) & BOTH_EMPTY) != BOTH_EMPTY);
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dw8250_write32(base, UART_TX, c);
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return 1;
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}
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static int dw8250_uart_getc(struct rt_serial_device *serial)
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{
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int ch = -1;
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rt_base_t base;
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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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base = uart->hw_base;
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if (dw8250_read32(base, UART_LSR) & UART_LSR_DR)
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{
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ch = dw8250_read32(base, UART_RX) & 0xff;
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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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dw8250_uart_configure,
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dw8250_uart_control,
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dw8250_uart_putc,
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dw8250_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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unsigned int iir, status;
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struct rt_serial_device *serial = (struct rt_serial_device *)param;
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struct hw_uart_device *uart = (struct hw_uart_device *)serial->parent.user_data;
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iir = dw8250_read32(uart->hw_base, UART_IIR);
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/* If don't do this in non-DMA mode then the "RX TIMEOUT" interrupt will fire forever. */
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if ((iir & 0x3f) == UART_IIR_RX_TIMEOUT)
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{
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status = dw8250_read32(uart->hw_base, UART_LSR);
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if (!(status & (UART_LSR_DR | UART_LSR_BI)))
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{
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dw8250_read32(uart->hw_base, UART_RX);
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}
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}
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if (!(iir & UART_IIR_NO_INT))
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{
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rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
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}
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if ((iir & UART_IIR_BUSY) == UART_IIR_BUSY)
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{
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/* Clear the USR */
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dw8250_read32(uart->hw_base, UART_USR);
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return;
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}
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}
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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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config.baud_rate = 115200;
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#define BSP_INSTALL_UART_DEVICE(no) \
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uart = &_uart##no##_device; \
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_serial##no.ops = &_uart_ops; \
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_serial##no.config = config; \
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rt_hw_serial_register(&_serial##no, "uart" #no, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX, uart); \
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rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, &_serial##no, "uart" #no);
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#ifdef RT_USING_UART0
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PINMUX_CONFIG(UART0_RX, UART0_RX);
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PINMUX_CONFIG(UART0_TX, UART0_TX);
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BSP_INSTALL_UART_DEVICE(0);
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#endif
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#ifdef RT_USING_UART1
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PINMUX_CONFIG(IIC0_SDA, UART1_RX);
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PINMUX_CONFIG(IIC0_SCL, UART1_TX);
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BSP_INSTALL_UART_DEVICE(1);
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#endif
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#ifdef RT_USING_UART2
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PINMUX_CONFIG(SD1_D1, UART2_RX);
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PINMUX_CONFIG(SD1_D2, UART2_TX);
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BSP_INSTALL_UART_DEVICE(2);
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#endif
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#ifdef RT_USING_UART3
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PINMUX_CONFIG(SD1_D1, UART3_RX);
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PINMUX_CONFIG(SD1_D2, UART3_TX);
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BSP_INSTALL_UART_DEVICE(3);
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#endif
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#ifdef RT_USING_UART4
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PINMUX_CONFIG(SD1_GP0, UART4_RX);
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PINMUX_CONFIG(SD1_GP1, UART4_TX);
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BSP_INSTALL_UART_DEVICE(4);
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#endif
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return 0;
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}
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