192 lines
4.0 KiB
C
192 lines
4.0 KiB
C
/*
|
|
* Copyright (c) 2014 Wind River Systems, Inc.
|
|
*
|
|
* Licensed 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.
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* @brief ARCv2 interrupt management
|
|
*
|
|
*
|
|
* Interrupt management:
|
|
*
|
|
* - enabling/disabling
|
|
* - dynamic ISR connecting/replacing
|
|
*
|
|
* SW_ISR_TABLE_DYNAMIC has to be enabled for connecting ISRs at runtime.
|
|
*
|
|
* An IRQ number passed to the @a irq parameters found in this file is a
|
|
* number from 16 to last IRQ number on the platform.
|
|
*/
|
|
|
|
#include <nanokernel.h>
|
|
#include <arch/cpu.h>
|
|
#include <misc/__assert.h>
|
|
#include <toolchain.h>
|
|
#include <sections.h>
|
|
#include <sw_isr_table.h>
|
|
|
|
|
|
/*
|
|
* @brief Enable an interrupt line
|
|
*
|
|
* Clear possible pending interrupts on the line, and enable the interrupt
|
|
* line. After this call, the CPU will receive interrupts for the specified
|
|
* @a irq.
|
|
*
|
|
* @return N/A
|
|
*/
|
|
|
|
void irq_enable(unsigned int irq)
|
|
{
|
|
int key = irq_lock();
|
|
|
|
_arc_v2_irq_unit_int_enable(irq);
|
|
irq_unlock(key);
|
|
}
|
|
|
|
/*
|
|
* @brief Disable an interrupt line
|
|
*
|
|
* Disable an interrupt line. After this call, the CPU will stop receiving
|
|
* interrupts for the specified @a irq.
|
|
*
|
|
* @return N/A
|
|
*/
|
|
|
|
void irq_disable(unsigned int irq)
|
|
{
|
|
int key = irq_lock();
|
|
|
|
_arc_v2_irq_unit_int_disable(irq);
|
|
irq_unlock(key);
|
|
}
|
|
|
|
/*
|
|
* @internal
|
|
*
|
|
* @brief Set an interrupt's priority
|
|
*
|
|
* Valid values are from 0 to 15. Interrupts of priority 1 are not masked when
|
|
* interrupts are locked system-wide, so care must be taken when using them. ISR
|
|
* installed with priority 0 interrupts cannot make kernel calls.
|
|
*
|
|
* The priority is verified if ASSERT_ON is enabled.
|
|
*
|
|
* @return N/A
|
|
*/
|
|
|
|
void _irq_priority_set(
|
|
unsigned int irq,
|
|
unsigned int prio
|
|
)
|
|
{
|
|
int key = irq_lock();
|
|
|
|
__ASSERT(prio >= 0 && prio < CONFIG_NUM_IRQ_PRIO_LEVELS,
|
|
"invalid priority!");
|
|
_arc_v2_irq_unit_prio_set(irq, prio);
|
|
irq_unlock(key);
|
|
}
|
|
|
|
/*
|
|
* @brief Spurious interrupt handler
|
|
*
|
|
* Installed in all dynamic interrupt slots at boot time. Throws an error if
|
|
* called.
|
|
*
|
|
* @return N/A
|
|
*/
|
|
|
|
#include <misc/printk.h>
|
|
void _irq_spurious(void *unused)
|
|
{
|
|
ARG_UNUSED(unused);
|
|
printk("_irq_spurious(). Spinning...\n");
|
|
for (;;)
|
|
;
|
|
}
|
|
|
|
#if CONFIG_SW_ISR_TABLE_DYNAMIC
|
|
/*
|
|
* @internal
|
|
*
|
|
* @brief Replace an interrupt handler by another
|
|
*
|
|
* An interrupt's ISR can be replaced at runtime.
|
|
*
|
|
* @return N/A
|
|
*/
|
|
|
|
void _irq_handler_set(
|
|
unsigned int irq,
|
|
void (*new)(void *arg),
|
|
void *arg
|
|
)
|
|
{
|
|
int key = irq_lock();
|
|
int index = irq - 16;
|
|
|
|
_sw_isr_table[index].isr = new;
|
|
_sw_isr_table[index].arg = arg;
|
|
|
|
irq_unlock(key);
|
|
}
|
|
|
|
/*
|
|
* @brief Connect an ISR to an interrupt line
|
|
*
|
|
* @a isr is connected to interrupt line @a irq, a number greater than or equal
|
|
* 16. No prior ISR can have been connected on @a irq interrupt line since the
|
|
* system booted.
|
|
*
|
|
* This routine will hang if another ISR was connected for interrupt line @a irq
|
|
* and ASSERT_ON is enabled; if ASSERT_ON is disabled, it will fail silently.
|
|
*
|
|
* @return the interrupt line number
|
|
*/
|
|
|
|
int irq_connect_dynamic(
|
|
unsigned int irq,
|
|
unsigned int prio,
|
|
void (*isr)(void *arg),
|
|
void *arg,
|
|
uint32_t flags
|
|
)
|
|
{
|
|
ARG_UNUSED(flags);
|
|
_irq_handler_set(irq, isr, arg);
|
|
_irq_priority_set(irq, prio);
|
|
return irq;
|
|
}
|
|
|
|
/*
|
|
* @internal
|
|
*
|
|
* @brief Disconnect an ISR from an interrupt line
|
|
*
|
|
* Interrupt line @a irq is disconnected from its ISR and the latter is
|
|
* replaced by _irq_spurious(). irq_disable() should have been called before
|
|
* invoking this routine.
|
|
*
|
|
* @return N/A
|
|
*/
|
|
|
|
void _irq_disconnect(unsigned int irq)
|
|
{
|
|
_irq_handler_set(irq, _irq_spurious, NULL);
|
|
}
|
|
|
|
#endif /* CONFIG_SW_ISR_TABLE_DYNAMIC */
|