nuttx/arch/risc-v/src/rv32m1/rv32m1_timersvc.c
Xiang Xiao 54e630e14d arch: Merge up_arch.h into up_internal.h
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2022-03-14 09:32:17 +02:00

98 lines
3.3 KiB
C

/****************************************************************************
* arch/risc-v/src/rv32m1/rv32m1_timersvc.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include "riscv_internal.h"
#include "rv32m1.h"
#include "hardware/rv32m1_tstmr.h"
#include "rv32m1_timersvc.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Data Definitions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: rv32m1_timersvc_up
****************************************************************************/
bool rv32m1_timersvc_up(void)
{
#ifdef CONFIG_RV32M1_TSTMR
/* TSTMR starts up when System Reset and TSTMR is Enabled by Option Byte.
* Query the Option Byte to check whether TSTMR is enabled.
*/
return (getreg8(RV32M1_FTFE_BASE + 0x10) & 0x01) != 0;
#else
return false;
#endif
}
/****************************************************************************
* Name: rv32m1_timersvc_freq
****************************************************************************/
uint32_t rv32m1_timersvc_freq(void)
{
/* TSTMR runs off 1MHz */
return 1000000u;
}
/****************************************************************************
* Name: rv32m1_timersvc_period
****************************************************************************/
uint32_t rv32m1_timersvc_period(void)
{
return 0xffffffffu;
}
/****************************************************************************
* Name: rv32m1_timersvc_value
****************************************************************************/
uint32_t rv32m1_timersvc_value(void)
{
/* Read High and Low Registers completely for the Right Result */
uint64_t value = *(volatile uint64_t *)(RV32M1_TSTMR_BASE);
/* It is ok to return the ONLY low valud caused the it is accumulated
* outside.
*/
return (uint32_t)value;
}