193 lines
4.1 KiB
C
193 lines
4.1 KiB
C
/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file
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* @brief ARCv2 interrupt management
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*
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*
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* Interrupt management:
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*
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* - enabling/disabling
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* - dynamic ISR connecting/replacing
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*
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* SW_ISR_TABLE_DYNAMIC has to be enabled for connecting ISRs at runtime.
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*
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* An IRQ number passed to the @a irq parameters found in this file is a
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* number from 16 to last IRQ number on the platform.
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*/
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#include <nanokernel.h>
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#include <arch/cpu.h>
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#include <misc/__assert.h>
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#include <toolchain.h>
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#include <sections.h>
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#include <sw_isr_table.h>
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#include <irq.h>
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/*
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* @brief Enable an interrupt line
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*
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* Clear possible pending interrupts on the line, and enable the interrupt
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* line. After this call, the CPU will receive interrupts for the specified
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* @a irq.
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*
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* @return N/A
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*/
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void _arch_irq_enable(unsigned int irq)
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{
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int key = irq_lock();
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_arc_v2_irq_unit_int_enable(irq);
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irq_unlock(key);
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}
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/*
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* @brief Disable an interrupt line
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*
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* Disable an interrupt line. After this call, the CPU will stop receiving
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* interrupts for the specified @a irq.
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*
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* @return N/A
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*/
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void _arch_irq_disable(unsigned int irq)
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{
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int key = irq_lock();
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_arc_v2_irq_unit_int_disable(irq);
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irq_unlock(key);
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}
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/*
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* @internal
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*
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* @brief Set an interrupt's priority
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*
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* Valid values are from 0 to 15. Interrupts of priority 1 are not masked when
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* interrupts are locked system-wide, so care must be taken when using them. ISR
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* installed with priority 0 interrupts cannot make kernel calls.
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*
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* The priority is verified if ASSERT_ON is enabled.
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*
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* @return N/A
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*/
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void _irq_priority_set(
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unsigned int irq,
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unsigned int prio
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)
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{
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int key = irq_lock();
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__ASSERT(prio >= 0 && prio < CONFIG_NUM_IRQ_PRIO_LEVELS,
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"invalid priority!");
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_arc_v2_irq_unit_prio_set(irq, prio);
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irq_unlock(key);
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}
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/*
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* @brief Spurious interrupt handler
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*
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* Installed in all dynamic interrupt slots at boot time. Throws an error if
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* called.
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*
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* @return N/A
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*/
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#include <misc/printk.h>
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void _irq_spurious(void *unused)
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{
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ARG_UNUSED(unused);
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printk("_irq_spurious(). Spinning...\n");
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for (;;)
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;
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}
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#if CONFIG_SW_ISR_TABLE_DYNAMIC
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/*
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* @internal
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*
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* @brief Replace an interrupt handler by another
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*
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* An interrupt's ISR can be replaced at runtime.
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*
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* @return N/A
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*/
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void _irq_handler_set(
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unsigned int irq,
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void (*new)(void *arg),
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void *arg
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)
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{
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int key = irq_lock();
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int index = irq - 16;
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__ASSERT(irq < CONFIG_NUM_IRQS, "IRQ number too high");
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_sw_isr_table[index].isr = new;
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_sw_isr_table[index].arg = arg;
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irq_unlock(key);
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}
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/*
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* @brief Connect an ISR to an interrupt line
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*
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* @a isr is connected to interrupt line @a irq, a number greater than or equal
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* 16. No prior ISR can have been connected on @a irq interrupt line since the
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* system booted.
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*
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* This routine will hang if another ISR was connected for interrupt line @a irq
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* and ASSERT_ON is enabled; if ASSERT_ON is disabled, it will fail silently.
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*
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* @return the interrupt line number
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*/
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int _arch_irq_connect_dynamic(
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unsigned int irq,
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unsigned int prio,
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void (*isr)(void *arg),
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void *arg,
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uint32_t flags
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)
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{
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ARG_UNUSED(flags);
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_irq_handler_set(irq, isr, arg);
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_irq_priority_set(irq, prio);
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return irq;
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}
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/*
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* @internal
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*
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* @brief Disconnect an ISR from an interrupt line
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*
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* Interrupt line @a irq is disconnected from its ISR and the latter is
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* replaced by _irq_spurious(). irq_disable() should have been called before
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* invoking this routine.
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*
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* @return N/A
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*/
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void _irq_disconnect(unsigned int irq)
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{
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_irq_handler_set(irq, _irq_spurious, NULL);
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}
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#endif /* CONFIG_SW_ISR_TABLE_DYNAMIC */
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