blob: dcd99921566dad897fa273d07acf3156e6aa4ae9 [file] [log] [blame]
/*
* Copyright (c) 2014-2015, Wind River Systems, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <errno.h>
#include <nanokernel.h>
#include <arch/cpu.h>
#include <sections.h>
#include <misc/__assert.h>
#include <stdint.h>
#include <misc/util.h>
#include <string.h>
#include <board.h>
#include <init.h>
#include <uart.h>
#define NSIM_UART_DATA 0
#define NSIM_UART_STATUS 1
#define DEV_CFG(dev) \
((const struct uart_device_config * const)(dev)->config->config_info)
#define DATA_REG(dev) (DEV_CFG(dev)->regs + NSIM_UART_DATA)
#define STATUS_REG(dev) (DEV_CFG(dev)->regs + NSIM_UART_STATUS)
#define TXEMPTY 0x80 /* Transmit FIFO empty and next character can be sent */
static const struct uart_driver_api uart_nsim_driver_api;
/**
* @brief Initialize fake serial port
*
* @param dev UART device struct
*
* @return 0
*/
static int uart_nsim_init(struct device *dev)
{
ARG_UNUSED(dev);
dev->driver_api = &uart_nsim_driver_api;
return 0;
}
/*
* @brief Output a character to serial port
*
* @param dev UART device struct
* @param c character to output
*/
unsigned char uart_nsim_poll_out(struct device *dev, unsigned char c)
{
/* wait for transmitter to ready to accept a character */
while ((_arc_v2_aux_reg_read(STATUS_REG(dev)) & TXEMPTY) == 0)
;
_arc_v2_aux_reg_write(DATA_REG(dev), c);
return c;
}
static int uart_nsim_poll_in(struct device *dev, unsigned char *c)
{
return -ENOTSUP;
}
static const struct uart_driver_api uart_nsim_driver_api = {
.poll_out = uart_nsim_poll_out,
.poll_in = uart_nsim_poll_in,
};
static struct uart_device_config uart_nsim_dev_cfg_0 = {
.regs = CONFIG_UART_NSIM_PORT_0_BASE_ADDR,
};
DEVICE_INIT(uart_nsim0, CONFIG_UART_NSIM_PORT_0_NAME, &uart_nsim_init,
NULL, &uart_nsim_dev_cfg_0,
PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);