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/*
* serial.c UART driver
*
* COPYRIGHT (C) 2013, Shanghai Real-Thread Technology Co., Ltd
*
* This file is part of RT-Thread (http://www.rt-thread.org)
* Maintainer: bernard.xiong <bernard.xiong at gmail.com>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2013-03-30 Bernard the first verion
*/
#include <rthw.h>
#include <rtdevice.h>
#include "serial.h"
#ifdef RT_USING_VMM
#include <vmm.h>
#endif
struct hw_uart_device
{
rt_uint32_t hw_base;
rt_uint32_t irqno;
};
#define UART_DR(base) __REG32(base + 0x00)
#define UART_FR(base) __REG32(base + 0x18)
#define UART_CR(base) __REG32(base + 0x30)
#define UART_IMSC(base) __REG32(base + 0x38)
#define UART_ICR(base) __REG32(base + 0x44)
#define UARTFR_RXFE 0x10
#define UARTFR_TXFF 0x20
#define UARTIMSC_RXIM 0x10
#define UARTIMSC_TXIM 0x20
#define UARTICR_RXIC 0x10
#define UARTICR_TXIC 0x20
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);
}
static rt_err_t uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
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 */
UART_IMSC(uart->hw_base) &= ~UARTIMSC_RXIM;
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
UART_IMSC(uart->hw_base) |= UARTIMSC_RXIM;
rt_hw_interrupt_install(uart->irqno, rt_hw_uart_isr, serial, "uart");
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 (UART_FR(uart->hw_base) & UARTFR_TXFF);
UART_DR(uart->hw_base) = c;
return 1;
}
static int uart_getc(struct rt_serial_device *serial)
{
int ch;
struct hw_uart_device *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct hw_uart_device *)serial->parent.user_data;
ch = -1;
if (!(UART_FR(uart->hw_base) & UARTFR_RXFE))
{
ch = UART_DR(uart->hw_base) & 0xff;
}
return ch;
}
static const struct rt_uart_ops _uart_ops =
{
uart_configure,
uart_control,
uart_putc,
uart_getc,
};
#ifdef RT_USING_UART0
/* UART device driver structure */
static struct hw_uart_device _uart0_device =
{
REALVIEW_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 =
{
REALVIEW_UART1_BASE,
IRQ_PBA8_UART1,
};
static struct rt_serial_device _serial1;
#endif
int uart_isr_test(void)
{
return uart_getc(&_serial1);
}
int rt_hw_uart_init(void)
{
struct hw_uart_device *uart;
struct serial_configure config;
config.baud_rate = BAUD_RATE_115200;
config.bit_order = BIT_ORDER_LSB;
config.data_bits = DATA_BITS_8;
config.parity = PARITY_NONE;
config.stop_bits = STOP_BITS_1;
config.invert = NRZ_NORMAL;
config.bufsz = RT_SERIAL_RB_BUFSZ;
#ifdef RT_USING_UART0
uart = &_uart0_device;
#ifdef RT_USING_VMM
uart->hw_base = vmm_find_iomap("UART0");
#endif
_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);
/* enable Rx and Tx of UART */
UART_CR(uart->hw_base) = (1 << 0) | (1 << 8) | (1 << 9);
#endif
#ifdef RT_USING_UART1
uart = &_uart1_device;
#ifdef RT_USING_VMM
uart->hw_base = vmm_find_iomap("UART1");
#endif
_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 */
UART_CR(uart->hw_base) = (1 << 0) | (1 << 8) | (1 << 9);
#endif
return 0;
}
INIT_BOARD_EXPORT(rt_hw_uart_init);
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