83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
/*
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* Copyright (c) 2014-2015, Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <errno.h>
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#include <kernel.h>
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#include <arch/cpu.h>
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#include <linker/sections.h>
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#include <misc/__assert.h>
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#include <zephyr/types.h>
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#include <misc/util.h>
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#include <string.h>
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#include <board.h>
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#include <init.h>
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#include <uart.h>
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#define NSIM_UART_DATA 0
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#define NSIM_UART_STATUS 1
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#define DEV_CFG(dev) \
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((const struct uart_device_config * const)(dev)->config->config_info)
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#define DATA_REG(dev) (DEV_CFG(dev)->regs + NSIM_UART_DATA)
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#define STATUS_REG(dev) (DEV_CFG(dev)->regs + NSIM_UART_STATUS)
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#define TXEMPTY 0x80 /* Transmit FIFO empty and next character can be sent */
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static const struct uart_driver_api uart_nsim_driver_api;
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/**
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* @brief Initialize fake serial port
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*
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* @param dev UART device struct
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*
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* @return 0
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*/
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static int uart_nsim_init(struct device *dev)
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{
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ARG_UNUSED(dev);
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dev->driver_api = &uart_nsim_driver_api;
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return 0;
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}
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/*
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* @brief Output a character to serial port
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*
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* @param dev UART device struct
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* @param c character to output
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*/
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unsigned char uart_nsim_poll_out(struct device *dev, unsigned char c)
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{
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/* wait for transmitter to ready to accept a character */
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while ((_arc_v2_aux_reg_read(STATUS_REG(dev)) & TXEMPTY) == 0)
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;
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_arc_v2_aux_reg_write(DATA_REG(dev), c);
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return c;
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}
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static int uart_nsim_poll_in(struct device *dev, unsigned char *c)
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{
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return -ENOTSUP;
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}
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static const struct uart_driver_api uart_nsim_driver_api = {
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.poll_out = uart_nsim_poll_out,
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.poll_in = uart_nsim_poll_in,
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};
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static struct uart_device_config uart_nsim_dev_cfg_0 = {
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.regs = CONFIG_UART_NSIM_PORT_0_BASE_ADDR,
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};
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DEVICE_INIT(uart_nsim0, CONFIG_UART_NSIM_PORT_0_NAME, &uart_nsim_init,
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NULL, &uart_nsim_dev_cfg_0,
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PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
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