/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @brief PCI IRQ Library
*/
/*
* COPYRIGHT (c) 2010 Cobham Gaisler AB.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/* IRQ handling does not have so much with PCI to do, this library depends
* on the BSP to implement shared interrupts.
*/
#ifndef __PCI_IRQ_H__
#define __PCI_IRQ_H__
#include <rtems/rtems/intr.h>
#include <rtems/score/basedefs.h>
/* PCI Handler (ISR) called when IRQ is generated by any of the PCI devices
* connected to the same PCI IRQ Pin. This has been defined the same way as
* rtems_interrupt_handler in order for BSPs to "direct-map" the register
* and unregister functions rtems_interrupt_handler_install/remove
*/
typedef void (*pci_isr)(void *arg);
/* Get assigned system IRQ to a PCI Device. If no IRQ 0 is returned */
extern int pci_dev_irq(pci_dev_t dev);
/* Register shared PCI IRQ handler, but does not enable it. The system interrupt
* number is read from the PCI board's PCI configuration space header iline
* field. The iline field is initialized by the PCI subsystem during start up,
* the ipin field is translated into a system IRQ and written to iline. The
* board's driver should use the iline field as the irq argument to this
* function.
*
* Arguments
* irq System IRQ number, normally taken from the PCI configuration area
* isr Function pointer to the ISR
* arg Second argument to function isr
*/
static inline int pci_interrupt_register(int irq, const char *info,
pci_isr isr, void *arg)
{
return rtems_interrupt_handler_install(irq, info,
RTEMS_INTERRUPT_SHARED, isr,
arg);
}
/* Unregister previously registered shared PCI IRQ handler
*
* Arguments
* irq System IRQ number, normally taken from the PCI configuration area
* isr Function pointer to the ISR
* arg Second argument to function isr
*/
static inline int pci_interrupt_unregister(int irq, pci_isr isr,
void *arg)
{
return rtems_interrupt_handler_remove(irq, isr, arg);
}
/* Enable shared PCI IRQ handler. This function will unmask the interrupt
* controller and mark this interrupt handler ready to handle interrupts. Note
* that since it is a shared interrupt handler service the interrupt may
* already be enabled, however no calls to this specific handler is made
* until it is enabled.
*
* Arguments
* irq System IRQ number, normally taken from the PCI configuration area
* isr Function pointer to the ISR
* arg Second argument to function isr
*/
static inline void pci_interrupt_unmask(int irq)
{
(void)rtems_interrupt_vector_enable((rtems_vector_number)irq);
}
/* Disable shared PCI IRQ handler. This function will mask the interrupt
* controller and mark this interrupt handler not ready to receive interrupts.
* Note that since it is a shared interrupt handler service the interrupt may
* still be enabled, however no calls to this specific handler is made
* while it is disabled.
*
* Arguments
* irq System IRQ number, normally taken from the PCI configuration area
* isr Function pointer to the ISR
* arg Second argument to function isr
*/
static inline void pci_interrupt_mask(int irq)
{
(void)rtems_interrupt_vector_disable((rtems_vector_number)irq);
}
/* Acknowledge the interrupt controller by writing to the interrupt controller.
* Note that since it is a shared interrupt handler service, clearing the
* interrupt source may affect other ISRs registered to this IRQ.
*
* Arguments
* irq System IRQ number, normally taken from the PCI configuration area
* isr Function pointer to the ISR
* arg Second argument to function isr
*/
static inline void pci_interrupt_clear(int irq)
{
(void)rtems_interrupt_clear((rtems_vector_number)irq);
}
#endif /* !__PCI_IRQ_H__ */
