nuttx/arch/risc-v/src/c906/c906_irq_dispatch.c

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/****************************************************************************
* arch/risc-v/src/c906/c906_irq_dispatch.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 <assert.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include "riscv_internal.h"
#include "group/group.h"
#include "c906_memorymap.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define RV_IRQ_MASK 59
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* riscv_dispatch_irq
****************************************************************************/
void *riscv_dispatch_irq(uintptr_t vector, uintptr_t *regs)
{
int irq = (vector >> RV_IRQ_MASK) | (vector & 0xf);
/* Firstly, check if the irq is machine external interrupt */
if (RISCV_IRQ_MEXT == irq)
{
uint32_t val = getreg32(C906_PLIC_MCLAIM);
/* Add the value to nuttx irq which is offset to the mext */
irq = val + C906_IRQ_PERI_START;
}
/* Acknowledge the interrupt */
riscv_ack_irq(irq);
/* MEXT means no interrupt */
if (RISCV_IRQ_MEXT != irq)
{
/* Deliver the IRQ */
regs = riscv_doirq(irq, regs);
}
if (C906_IRQ_PERI_START <= irq)
{
/* Then write PLIC_CLAIM to clear pending in PLIC */
putreg32(irq - C906_IRQ_PERI_START, C906_PLIC_MCLAIM);
}
return regs;
}