121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/* Copyright (c) 2018, Synopsys, Inc.
|
|
* Copyright (c) 2014-2015, Wind River Systems, Inc.
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include <errno.h>
|
|
|
|
#include <kernel.h>
|
|
#include <arch/cpu.h>
|
|
#include <linker/sections.h>
|
|
#include <misc/__assert.h>
|
|
#include <zephyr/types.h>
|
|
#include <misc/util.h>
|
|
#include <string.h>
|
|
#include <init.h>
|
|
#include <uart.h>
|
|
|
|
/*
|
|
* for nsimdrv, "nsim_mem-dev=uart0,base=0xf0000000,irq=24" is
|
|
* used to simulate a uart.
|
|
*
|
|
* UART Register set (this is not a Standards Compliant IP)
|
|
* Also each reg is Word aligned, but only 8 bits wide
|
|
*/
|
|
#define R_ID0 0
|
|
#define R_ID1 4
|
|
#define R_ID2 8
|
|
#define R_ID3 12
|
|
#define R_DATA 16
|
|
#define R_STS 20
|
|
#define R_BAUDL 24
|
|
#define R_BAUDH 28
|
|
|
|
/* Bits for UART Status Reg (R/W) */
|
|
#define RXIENB 0x04 /* Receive Interrupt Enable */
|
|
#define TXIENB 0x40 /* Transmit Interrupt Enable */
|
|
|
|
#define RXEMPTY 0x20 /* Receive FIFO Empty: No char receivede */
|
|
#define TXEMPTY 0x80 /* Transmit FIFO Empty, thus char can be written into */
|
|
|
|
#define RXFULL 0x08 /* Receive FIFO full */
|
|
#define RXFULL1 0x10 /* Receive FIFO has space for 1 char (tot space=4) */
|
|
|
|
#define RXFERR 0x01 /* Frame Error: Stop Bit not detected */
|
|
#define RXOERR 0x02 /* OverFlow Err: Char recv but RXFULL still set */
|
|
|
|
|
|
#define DEV_CFG(dev) \
|
|
((const struct uart_device_config * const)(dev)->config->config_info)
|
|
|
|
|
|
#define UART_REG_SET(u, r, v) ((*(u8_t *)(u + r)) = v)
|
|
#define UART_REG_GET(u, r) (*(u8_t *)(u + r))
|
|
|
|
#define UART_REG_OR(u, r, v) UART_REG_SET(u, r, UART_REG_GET(u, r) | (v))
|
|
#define UART_REG_CLR(u, r, v) UART_REG_SET(u, r, UART_REG_GET(u, r) & ~(v))
|
|
|
|
#define UART_SET_DATA(uart, val) UART_REG_SET(uart, R_DATA, val)
|
|
#define UART_GET_DATA(uart) UART_REG_GET(uart, R_DATA)
|
|
|
|
#define UART_CLR_STATUS(uart, val) UART_REG_CLR(uart, R_STS, val)
|
|
#define UART_GET_STATUS(uart) UART_REG_GET(uart, R_STS)
|
|
|
|
|
|
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)
|
|
{
|
|
u32_t regs = DEV_CFG(dev)->regs;
|
|
/* wait for transmitter to ready to accept a character */
|
|
|
|
while (!(UART_GET_STATUS(regs) & TXEMPTY))
|
|
;
|
|
|
|
UART_SET_DATA(regs, 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);
|