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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2011-01-13 weety first version
*/
#include <rtthread.h>
#include <rthw.h>
#include <dm36x.h>
#include <rtdevice.h>
static struct rt_serial_device davinci_serial_dev0;
static struct rt_serial_device davinci_serial_dev1;
#define LSR_DR 0x01 /* Data ready */
#define LSR_THRE 0x20 /* Xmit holding register empty */
//#define USTAT_TXB_EMPTY 0x02 /* tx buffer empty */
#define BPS 115200 /* serial baudrate */
typedef struct uartport
{
volatile rt_uint32_t rbr;
volatile rt_uint32_t ier;
volatile rt_uint32_t fcr;
volatile rt_uint32_t lcr;
volatile rt_uint32_t mcr;
volatile rt_uint32_t lsr;
volatile rt_uint32_t msr;
volatile rt_uint32_t scr;
volatile rt_uint32_t dll;
volatile rt_uint32_t dlh;
volatile rt_uint32_t res[2];
volatile rt_uint32_t pwremu_mgmt;
volatile rt_uint32_t mdr;
}uartport;
#define thr rbr
#define iir fcr
#define UART0 ((struct uartport *)DAVINCI_UART0_BASE)
#define UART1 ((struct uartport *)DM365_UART1_BASE)
/**
* This function will handle serial
*/
void rt_davinci_serial_handler(int vector, void *param)
{
struct rt_serial_device *dev = (struct rt_serial_device *)param;
rt_hw_serial_isr(dev, RT_SERIAL_EVENT_RX_IND);
}
/**
* UART device in RT-Thread
*/
static rt_err_t davinci_uart_configure(struct rt_serial_device *serial,
struct serial_configure *cfg)
{
return RT_EOK;
}
static rt_err_t davinci_uart_control(struct rt_serial_device *serial,
int cmd, void *arg)
{
uartport *uart = serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
if (uart == UART0)
rt_hw_interrupt_mask(IRQ_UARTINT0);
else if (uart == UART1)
rt_hw_interrupt_mask(IRQ_UARTINT1);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
if (uart == UART0)
rt_hw_interrupt_umask(IRQ_UARTINT0);
else if (uart == UART1)
rt_hw_interrupt_umask(IRQ_UARTINT1);
break;
}
return RT_EOK;
}
static int davinci_uart_putc(struct rt_serial_device *serial, char c)
{
rt_uint32_t level;
uartport *uart = serial->parent.user_data;
while (!(uart->lsr & LSR_THRE));
uart->thr = c;
return 1;
}
static int davinci_uart_getc(struct rt_serial_device *serial)
{
int result;
uartport *uart = serial->parent.user_data;
if (uart->lsr & LSR_DR)
{
result = uart->rbr & 0xff;
}
else
{
result = -1;
}
return result;
}
static const struct rt_uart_ops davinci_uart_ops =
{
davinci_uart_configure,
davinci_uart_control,
davinci_uart_putc,
davinci_uart_getc,
};
void davinci_uart0_init(void)
{
rt_uint32_t divisor;
divisor = (24000000 + (115200 * (16 / 2))) / (16 * 115200);
UART0->ier = 0;
UART0->lcr = 0x83; //8N1
UART0->dll = 0;
UART0->dlh = 0;
UART0->lcr = 0x03;
UART0->mcr = 0x03; //RTS,CTS
UART0->fcr = 0x07; //FIFO
UART0->lcr = 0x83;
UART0->dll = divisor & 0xff;
UART0->dlh = (divisor >> 8) & 0xff;
UART0->lcr = 0x03;
UART0->mdr = 0; //16x over-sampling
UART0->pwremu_mgmt = 0x6000;
rt_hw_interrupt_install(IRQ_UARTINT0, rt_davinci_serial_handler,
(void *)&davinci_serial_dev0, "UART0");
rt_hw_interrupt_mask(IRQ_UARTINT0);
UART0->ier = 0x05;
}
void davinci_uart_gpio_init()
{
rt_uint32_t val;
val = davinci_readl(PINMUX3);
val &= 0xf3ffffff; /* gio23 RS485_CTRL */
val |= 0x60000000; /*UART1_TXD (gio25)*/
davinci_writel(val, PINMUX3);
val = davinci_readl(PINMUX4);
val |= 0x0000c000; /* UART1_RXD (gio34) */
davinci_writel(val, PINMUX4);
val = davinci_readl(DAVINCI_GPIO_BASE + 0x10);
val &= ~(1 << 23);
davinci_writel(val, DAVINCI_GPIO_BASE + 0x10);
davinci_writel((1<<23), DAVINCI_GPIO_BASE + 0x1C);
}
void davinci_uart1_init(void)
{
rt_uint32_t divisor;
rt_uint32_t freq;
rt_uint32_t baudrate;
struct clk *clk;
davinci_uart_gpio_init();
psc_change_state(DAVINCI_DM365_LPSC_UART1, PSC_ENABLE);
clk = clk_get("UART1");
freq = clk_get_rate(clk);
baudrate = 9600;
divisor = (freq + (baudrate * (16 / 2))) / (16 * baudrate);
UART1->ier = 0;
UART1->lcr = 0x87; //8N2, 0x83 8N1
UART1->dll = 0;
UART1->dlh = 0;
UART1->lcr = 0x07;
UART1->mcr = 0x03; //RTS,CTS
UART1->fcr = 0x07; //FIFO
UART1->lcr = 0x87;
UART1->dll = divisor & 0xff;
UART1->dlh = (divisor >> 8) & 0xff;
UART1->lcr = 0x07;
UART1->mdr = 0; //16x over-sampling
UART1->pwremu_mgmt = 0x6000;
rt_hw_interrupt_install(IRQ_UARTINT1, rt_davinci_serial_handler,
(void *)&davinci_serial_dev1, "UART1");
rt_hw_interrupt_mask(IRQ_UARTINT1);
UART1->ier = 0x05;
}
/**
* This function will handle init uart
*/
int rt_hw_uart_init(void)
{
davinci_serial_dev0.ops = &davinci_uart_ops;
//davinci_serial_dev0.config = RT_SERIAL_CONFIG_DEFAULT;
davinci_serial_dev0.config.baud_rate = BAUD_RATE_115200;
davinci_serial_dev0.config.bit_order = BIT_ORDER_LSB;
davinci_serial_dev0.config.data_bits = DATA_BITS_8;
davinci_serial_dev0.config.parity = PARITY_NONE;
davinci_serial_dev0.config.stop_bits = STOP_BITS_1;
davinci_serial_dev0.config.invert = NRZ_NORMAL;
davinci_serial_dev0.config.bufsz = RT_SERIAL_RB_BUFSZ;
/* register vcom device */
rt_hw_serial_register(&davinci_serial_dev0, "uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
UART0);
davinci_uart0_init();
davinci_serial_dev1.ops = &davinci_uart_ops;
//davinci_serial_dev1.config = RT_SERIAL_CONFIG_DEFAULT;
davinci_serial_dev1.config.baud_rate = BAUD_RATE_115200;
davinci_serial_dev1.config.bit_order = BIT_ORDER_LSB;
davinci_serial_dev1.config.data_bits = DATA_BITS_8;
davinci_serial_dev1.config.parity = PARITY_NONE;
davinci_serial_dev1.config.stop_bits = STOP_BITS_1;
davinci_serial_dev1.config.invert = NRZ_NORMAL;
davinci_serial_dev1.config.bufsz = RT_SERIAL_RB_BUFSZ;
/* register vcom device */
rt_hw_serial_register(&davinci_serial_dev1, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
UART1);
davinci_uart1_init();
return 0;
}
INIT_BOARD_EXPORT(rt_hw_uart_init);
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