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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-04-05 bigmagic Initial version
* 2020-10-28 ma Buadrate & Multi-Port support
*/
/**
* @addtogroup ls2k
*/
/*@{*/
#include <rtthread.h>
#include <rtdevice.h>
#include <rthw.h>
#include "drv_uart.h"
#define TRUE 1
#define FALSE 0
const struct serial_configure config_uart0 = {
BAUD_RATE_115200, /* 921600 bits/s */
DATA_BITS_8, /* 8 databits */
STOP_BITS_1, /* 1 stopbit */
PARITY_NONE, /* No parity */
BIT_ORDER_LSB, /* LSB first sent */
NRZ_NORMAL, /* Normal mode */
RT_SERIAL_RB_BUFSZ, /* Buffer size */
0
};
struct rt_uart_ls2k
{
void *base;
rt_uint32_t IRQ;
};
static rt_err_t ls2k_uart_set_buad(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct rt_uart_ls2k *uart_dev = RT_NULL;
rt_err_t ret = RT_EOK;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
uint64_t brtc = (125000000U) / (16 * (cfg->baud_rate));
UART_LCR(uart_dev->base) = 0x80; // Activate buadcfg
UART_LSB(uart_dev->base) = brtc & 0xff;
UART_MSB(uart_dev->base) = brtc >> 8;
if (((((short)UART_MSB(uart_dev->base)) << 8) | UART_LSB(uart_dev->base)) != brtc) ret = RT_ERROR;
UART_LCR(uart_dev->base) = CFCR_8BITS; // Back to normal
UART_MCR(uart_dev->base) = MCR_IENABLE/* | MCR_DTR | MCR_RTS*/;
UART_IER(uart_dev->base) = 0;
}
static rt_err_t ls2k_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct rt_uart_ls2k *uart_dev = RT_NULL;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
ls2k_uart_set_buad(serial, cfg);
uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
HWREG8(0xffffffffbfe10428) = 0x1f; // Enable Multi-Port Support, by default it's 0x11 ,which means UART0 & UART4 Controller is in single port mode.
UART_IER(uart_dev->base) = 0; /* clear interrupt */
UART_FCR(uart_dev->base) = 0xc1; /* reset UART Rx/Tx */
/* set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */
UART_LCR(uart_dev->base) = 0x3;
UART_MCR(uart_dev->base) = 0x3;
UART_LSR(uart_dev->base) = 0x60;
UART_MSR(uart_dev->base) = 0xb0;
return RT_EOK;
}
static rt_err_t ls2k_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct rt_uart_ls2k *uart_dev = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT: /* Disable RX IRQ */
rt_hw_interrupt_mask(uart_dev->IRQ);
break;
case RT_DEVICE_CTRL_SET_INT: /* Enable RX IRQ */
rt_hw_interrupt_umask(uart_dev->IRQ);
UART_IER(uart_dev->base) |= (IER_IRxE | IER_ILE);
break;
default:
break;
}
return RT_EOK;
}
static rt_bool_t uart_is_transmit_empty(struct rt_uart_ls2k *uart_dev)
{
unsigned char status = UART_LSR(uart_dev->base);
if (status & (UARTLSR_TE | UARTLSR_TFE))
{
return TRUE;
}
else
{
return FALSE;
}
}
static int ls2k_uart_putc(struct rt_serial_device *serial, char c)
{
struct rt_uart_ls2k *uart_dev = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
while (FALSE == uart_is_transmit_empty(uart_dev))
;
UART_DAT(uart_dev->base) = c;
return 1;
}
static int ls2k_uart_getc(struct rt_serial_device *serial)
{
struct rt_uart_ls2k *uart_dev = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
if (LSR_RXRDY & UART_LSR(uart_dev->base))
{
return UART_DAT(uart_dev->base);
}
return -1;
}
/* UART interrupt handler */
static void uart_irq_handler(int vector, void *param)
{
struct rt_serial_device *serial = (struct rt_serial_device *)param;
struct rt_uart_ls2k *uart_dev = RT_NULL;
RT_ASSERT(serial != RT_NULL);
uart_dev = (struct rt_uart_ls2k *)serial->parent.user_data;
unsigned char iir = UART_IIR(uart_dev->base);
/* Find out interrupt reason */
if ((IIR_RXTOUT & iir) || (IIR_RXRDY & iir))
{
rt_interrupt_enter();
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
rt_interrupt_leave();
}
}
static const struct rt_uart_ops ls2k_uart_ops =
{
ls2k_uart_configure,
ls2k_uart_control,
ls2k_uart_putc,
ls2k_uart_getc,
};
struct rt_uart_ls2k uart_dev0 =
{
(void *)UARTx_BASE(0),
LS2K_UART_0_1_2_3_IRQ,
};
struct rt_uart_ls2k uart_dev4 =
{
(void *)UARTx_BASE(4),
LS2K_UART_4_5_6_7_IRQ,
};
struct rt_serial_device serial, serial4;
void rt_hw_uart_init(void)
{
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#ifdef RT_USING_UART0
struct rt_uart_ls2k *uart0;
uart0 = &uart_dev0;
serial.ops = &ls2k_uart_ops;
serial.config = config_uart0;
rt_hw_interrupt_install(uart0->IRQ, uart_irq_handler, &serial, "UART0");
/* register UART device */
rt_hw_serial_register(&serial,
"uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart0);
#endif
#ifdef RT_USING_UART4
struct rt_uart_ls2k *uart4;
uart4 = &uart_dev4;
serial4.ops = &ls2k_uart_ops;
serial4.config = config;
rt_hw_interrupt_install(uart4->IRQ, uart_irq_handler, &serial4, "UART4");
rt_hw_serial_register(&serial4,
"uart4",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
&uart_dev4);
#endif
}
/*@}*/
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