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82 lines
1.8 KiB
82 lines
1.8 KiB
/* |
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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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