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