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109 lines
3.8 KiB
C
109 lines
3.8 KiB
C
/* PCI IRQ Library
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*
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* COPYRIGHT (c) 2010 Cobham Gaisler AB.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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/* IRQ handling does not have so much with PCI to do, this library depends
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* on the BSP to implement shared interrupts.
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*/
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#ifndef __PCI_IRQ_H__
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#define __PCI_IRQ_H__
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#include <bsp.h>
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#include <rtems/irq-extension.h>
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#include <rtems/score/basedefs.h>
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/* PCI Handler (ISR) called when IRQ is generated by any of the PCI devices
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* connected to the same PCI IRQ Pin. This has been defined the same way as
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* rtems_interrupt_handler in order for BSPs to "direct-map" the register
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* and unregister functions rtems_interrupt_handler_install/remove
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*/
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typedef void (*pci_isr)(void *arg);
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/* Get assigned system IRQ to a PCI Device. If no IRQ 0 is returned */
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extern int pci_dev_irq(pci_dev_t dev);
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/* Register shared PCI IRQ handler, but does not enable it. The system interrupt
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* number is read from the PCI board's PCI configuration space header iline
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* field. The iline field is initialized by the PCI subsystem during start up,
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* the ipin field is translated into a system IRQ and written to iline. The
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* board's driver should use the iline field as the irq argument to this
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* function.
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*
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* Arguments
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* irq System IRQ number, normally taken from the PCI configuration area
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* isr Function pointer to the ISR
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* arg Second argument to function isr
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*/
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RTEMS_INLINE_ROUTINE int pci_interrupt_register(int irq, const char *info,
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pci_isr isr, void *arg)
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{
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return BSP_PCI_shared_interrupt_register(irq, info, isr, arg);
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}
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/* Unregister previously registered shared PCI IRQ handler
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*
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* Arguments
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* irq System IRQ number, normally taken from the PCI configuration area
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* isr Function pointer to the ISR
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* arg Second argument to function isr
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*/
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RTEMS_INLINE_ROUTINE int pci_interrupt_unregister(int irq, pci_isr isr,
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void *arg)
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{
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return BSP_PCI_shared_interrupt_unregister(irq, isr, arg);
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}
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/* Enable shared PCI IRQ handler. This function will unmask the interrupt
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* controller and mark this interrupt handler ready to handle interrupts. Note
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* that since it is a shared interrupt handler service the interrupt may
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* already be enabled, however no calls to this specific handler is made
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* until it is enabled.
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*
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* Arguments
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* irq System IRQ number, normally taken from the PCI configuration area
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* isr Function pointer to the ISR
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* arg Second argument to function isr
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*/
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RTEMS_INLINE_ROUTINE void pci_interrupt_unmask(int irq)
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{
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BSP_PCI_shared_interrupt_unmask(irq);
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}
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/* Disable shared PCI IRQ handler. This function will mask the interrupt
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* controller and mark this interrupt handler not ready to receive interrupts.
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* Note that since it is a shared interrupt handler service the interrupt may
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* still be enabled, however no calls to this specific handler is made
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* while it is disabled.
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*
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* Arguments
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* irq System IRQ number, normally taken from the PCI configuration area
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* isr Function pointer to the ISR
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* arg Second argument to function isr
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*/
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RTEMS_INLINE_ROUTINE void pci_interrupt_mask(int irq)
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{
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BSP_PCI_shared_interrupt_mask(irq);
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}
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/* Acknowledge the interrupt controller by writing to the interrupt controller.
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* Note that since it is a shared interrupt handler service, clearing the
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* interrupt source may affect other ISRs registered to this IRQ.
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*
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* Arguments
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* irq System IRQ number, normally taken from the PCI configuration area
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* isr Function pointer to the ISR
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* arg Second argument to function isr
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*/
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RTEMS_INLINE_ROUTINE void pci_interrupt_clear(int irq)
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{
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BSP_PCI_shared_interrupt_clear(irq);
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}
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#endif /* !__PCI_IRQ_H__ */
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