118 lines
2.9 KiB
C
118 lines
2.9 KiB
C
/* Copyright (c) 2018, Synopsys, Inc.
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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 <init.h>
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#include <uart.h>
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/*
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* for nsimdrv, "nsim_mem-dev=uart0,base=0xf0000000,irq=24" is
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* used to simulate a uart.
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*
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* UART Register set (this is not a Standards Compliant IP)
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* Also each reg is Word aligned, but only 8 bits wide
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*/
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#define R_ID0 0
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#define R_ID1 4
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#define R_ID2 8
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#define R_ID3 12
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#define R_DATA 16
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#define R_STS 20
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#define R_BAUDL 24
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#define R_BAUDH 28
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/* Bits for UART Status Reg (R/W) */
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#define RXIENB 0x04 /* Receive Interrupt Enable */
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#define TXIENB 0x40 /* Transmit Interrupt Enable */
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#define RXEMPTY 0x20 /* Receive FIFO Empty: No char receivede */
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#define TXEMPTY 0x80 /* Transmit FIFO Empty, thus char can be written into */
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#define RXFULL 0x08 /* Receive FIFO full */
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#define RXFULL1 0x10 /* Receive FIFO has space for 1 char (tot space=4) */
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#define RXFERR 0x01 /* Frame Error: Stop Bit not detected */
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#define RXOERR 0x02 /* OverFlow Err: Char recv but RXFULL still set */
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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 UART_REG_SET(u, r, v) ((*(u8_t *)(u + r)) = v)
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#define UART_REG_GET(u, r) (*(u8_t *)(u + r))
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#define UART_REG_OR(u, r, v) UART_REG_SET(u, r, UART_REG_GET(u, r) | (v))
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#define UART_REG_CLR(u, r, v) UART_REG_SET(u, r, UART_REG_GET(u, r) & ~(v))
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#define UART_SET_DATA(uart, val) UART_REG_SET(uart, R_DATA, val)
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#define UART_GET_DATA(uart) UART_REG_GET(uart, R_DATA)
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#define UART_CLR_STATUS(uart, val) UART_REG_CLR(uart, R_STS, val)
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#define UART_GET_STATUS(uart) UART_REG_GET(uart, R_STS)
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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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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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static void uart_nsim_poll_out(struct device *dev, unsigned char c)
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{
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u32_t regs = DEV_CFG(dev)->regs;
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/* wait for transmitter to ready to accept a character */
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while (!(UART_GET_STATUS(regs) & TXEMPTY))
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;
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UART_SET_DATA(regs, 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 = DT_SNPS_NSIM_UART_0_BASE_ADDRESS,
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};
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DEVICE_AND_API_INIT(uart_nsim0, DT_SNPS_NSIM_UART_0_LABEL, &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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&uart_nsim_driver_api);
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