130 lines
4.3 KiB
C
130 lines
4.3 KiB
C
/****************************************************************************
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* arch/risc-v/src/fe310/fe310_lowputc.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <arch/board/board.h>
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#include "riscv_internal.h"
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#include "riscv_arch.h"
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#include "fe310_config.h"
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#include "hardware/fe310_memorymap.h"
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#include "hardware/fe310_uart.h"
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#include "fe310_clockconfig.h"
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#include "fe310.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Select UART parameters for the selected console */
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#ifdef HAVE_SERIAL_CONSOLE
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# if defined(CONFIG_UART0_SERIAL_CONSOLE)
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# define FE310_CONSOLE_BASE FE310_UART0_BASE
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# define FE310_CONSOLE_BAUD CONFIG_UART0_BAUD
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# define FE310_CONSOLE_BITS CONFIG_UART0_BITS
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# define FE310_CONSOLE_PARITY CONFIG_UART0_PARITY
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# define FE310_CONSOLE_2STOP CONFIG_UART0_2STOP
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# define FE310_CONSOLE_TX GPIO_UART0_TX
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# define FE310_CONSOLE_RX GPIO_UART0_RX
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# define HAVE_UART
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# elif defined(CONFIG_UART1_SERIAL_CONSOLE)
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# define FE310_CONSOLE_BASE FE310_UART1_BASE
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# define FE310_CONSOLE_BAUD CONFIG_UART1_BAUD
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# define FE310_CONSOLE_BITS CONFIG_UART1_BITS
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# define FE310_CONSOLE_PARITY CONFIG_UART1_PARITY
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# define FE310_CONSOLE_2STOP CONFIG_UART1_2STOP
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# define FE310_CONSOLE_TX GPIO_UART1_TX
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# define FE310_CONSOLE_RX GPIO_UART1_RX
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# define HAVE_UART
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# endif
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#endif /* HAVE_CONSOLE */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: riscv_lowputc
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*
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* Description:
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* Output one byte on the serial console
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*
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****************************************************************************/
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void riscv_lowputc(char ch)
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{
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#ifdef HAVE_SERIAL_CONSOLE
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/* Wait until the TX data register is empty */
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while ((getreg32(FE310_CONSOLE_BASE + UART_TXDATA_OFFSET) & UART_TX_FULL))
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;
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/* Then send the character */
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putreg32((uint32_t)ch, FE310_CONSOLE_BASE + UART_TXDATA_OFFSET);
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#endif /* HAVE_CONSOLE */
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}
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/****************************************************************************
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* Name: fe310_lowsetup
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*
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* Description:
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* This performs basic initialization of the UART used for the serial
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* console. Its purpose is to get the console output available as soon
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* as possible.
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*
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****************************************************************************/
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void fe310_lowsetup(void)
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{
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#if defined(HAVE_UART)
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/* Enable and configure the selected console device */
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#if defined(HAVE_SERIAL_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
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/* Configure the UART Baud Rate */
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uint32_t hfclk = fe310_get_hfclk();
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uint32_t div;
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div = hfclk / 1152; /* NOTE: To avoid a bug with debugger */
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div /= 100;
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div -= 1;
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putreg32(div, FE310_CONSOLE_BASE + UART_DIV_OFFSET);
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/* Enable TX */
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putreg32(1, FE310_CONSOLE_BASE + UART_TXCTL_OFFSET);
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#endif /* HAVE_SERIAL_CONSOLE && !CONFIG_SUPPRESS_UART_CONFIG */
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#endif /* HAVE_UART */
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}
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