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arch/litex/litex_arch_alarm: Support tickless schedular with arch alarm.

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This provides an alternate tickless scheduling method, which uses the riscv
mtimer as a timebase, allowing the time and timeh registers to used
throughout an application.

The exiting tickless method, using Litex's timer0 has been left in place, as
it is a more performant option, but currently has the potential issue
identified in #11189.
This commit is contained in:
Stuart Ianna 2024-05-10 12:08:03 +10:00 committed by Xiang Xiao
parent c1f3245167
commit 1f02c05c6d
3 changed files with 62 additions and 0 deletions
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4
arch/risc-v/src/litex/Make.defs
View File

@ -38,7 +38,11 @@ CHIP_ASRCS += litex_cache.S
ifeq ($(CONFIG_SCHED_TICKLESS),y)
ifeq ($(CONFIG_SCHED_TICKLESS_ALARM),y)
CHIP_CSRCS += litex_arch_alarm.c
else
CHIP_CSRCS += litex_tickless.c
endif
else
CHIP_CSRCS += litex_ticked.c
endif

56
arch/risc-v/src/litex/litex_arch_alarm.c Normal file
View File

@ -0,0 +1,56 @@
/****************************************************************************
* arch/risc-v/src/litex/litex_arch_alarm.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 <assert.h>
#include <nuttx/config.h>
#include <nuttx/timers/arch_alarm.h>
#include "chip.h"
#include "litex_clockconfig.h"
#include "riscv_internal.h"
#include "riscv_mtimer.h"
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Function: up_timer_initialize
*
* Description:
* This function is called during start-up to initialize
* the timer interrupt.
*
****************************************************************************/
void up_timer_initialize(void)
{
struct oneshot_lowerhalf_s *lower
= riscv_mtimer_initialize(LITEX_CLINT_MTIME, LITEX_CLINT_MTIMECMP,
RISCV_IRQ_TIMER, litex_get_hfclk());
DEBUGASSERT(lower);
up_alarm_set_lowerhalf(lower);
}

2
boards/risc-v/litex/arty_a7/configs/knsh-tickless/defconfig
View File

@ -8,6 +8,7 @@
# CONFIG_DEBUG_OPT_UNUSED_SECTIONS is not set
# CONFIG_NSH_DISABLE_LOSMART is not set
# CONFIG_STANDARD_SERIAL is not set
CONFIG_ALARM_ARCH=y
CONFIG_ARCH="risc-v"
CONFIG_ARCH_ADDRENV=y
CONFIG_ARCH_BOARD="arty_a7"
@ -61,6 +62,7 @@ CONFIG_NFILE_DESCRIPTORS_PER_BLOCK=6
CONFIG_NSH_FILEIOSIZE=512
CONFIG_NSH_FILE_APPS=y
CONFIG_NSH_READLINE=y
CONFIG_ONESHOT=y
CONFIG_PATH_INITIAL="/system/bin"
CONFIG_RAM_SIZE=4194304
CONFIG_RAM_START=0x40400000