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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 "raspi.h"
#include "board.h"
#include "drv_uart.h"
#define AUX_BASE (0x3F000000 + 0x215000)
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)
{
struct hw_uart_device *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct hw_uart_device *)serial->parent.user_data;
if (uart->hw_base == AUX_BASE)
{
rt_uint32_t value;
/* GPIO function set */
value = BCM283X_GPIO_GPFSEL(1);
value &= ~(7 << 12); /* GPIO14 */
value |= 2 << 12 ; /* ALT5 */
value &= ~(7 << 15); /* GPIO15 */
value |= 2 << 15 ; /* ALT5 */
BCM283X_GPIO_GPFSEL(1) = value;
BCM283X_GPIO_GPPUD = 0;
BCM283X_GPIO_GPPUDCLK(0) = (1 << 14) | (1 << 15);
BCM283X_GPIO_GPPUDCLK(0) = 0;
AUX_ENABLES(uart->hw_base) = 1; /* Enable UART1 */
AUX_MU_IER_REG(uart->hw_base) = 0; /* Disable interrupt */
AUX_MU_CNTL_REG(uart->hw_base) = 0; /* Disable Transmitter and Receiver */
AUX_MU_LCR_REG(uart->hw_base) = 3; /* Works in 8-bit mode */
AUX_MU_MCR_REG(uart->hw_base) = 0; /* Disable RTS */
AUX_MU_IIR_REG(uart->hw_base) = 0xC6; /* Enable FIFO, Clear FIFO */
AUX_MU_BAUD_REG(uart->hw_base) = 270; /* 115200 = system clock 250MHz / (8 * (baud + 1)), baud = 270 */
AUX_MU_CNTL_REG(uart->hw_base) = 3; /* Enable Transmitter and Receiver */
}
return RT_EOK;
}
static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct hw_uart_device *uart;
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 */
AUX_MU_IER_REG(uart->hw_base) = 0x0;
rt_hw_interrupt_mask(uart->irqno);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
AUX_MU_IER_REG(uart->hw_base) = 0x1;
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 (!(AUX_MU_LSR_REG(uart->hw_base) & 0x20));
AUX_MU_IO_REG(uart->hw_base) = c;
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 ((AUX_MU_LSR_REG(uart->hw_base) & 0x01))
{
ch = AUX_MU_IO_REG(uart->hw_base) & 0xff;
}
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 =
{
RPI_UART0_BASE,
IRQ_PBA8_UART0,
};
static struct rt_serial_device _serial0;
#endif
#ifdef RT_USING_UART1
/* UART1 device driver structure */
static struct hw_uart_device _uart1_device =
{
AUX_BASE,
IRQ_AUX,
};
static struct rt_serial_device _serial1;
#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
#ifdef RT_USING_UART1
uart = &_uart1_device;
_serial1.ops = &_uart_ops;
_serial1.config = config;
/* register UART1 device */
rt_hw_serial_register(&_serial1, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX, uart);
/* enable Rx and Tx of UART */
rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, &_serial1, "uart1");
#endif
return 0;
}
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