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Diffstat (limited to 'include/pci/irq.h')
| -rw-r--r-- | include/pci/irq.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/include/pci/irq.h b/include/pci/irq.h new file mode 100644 index 0000000000..6c84977d45 --- /dev/null +++ b/include/pci/irq.h @@ -0,0 +1,108 @@ +/* PCI IRQ Library + * + * COPYRIGHT (c) 2010 Cobham Gaisler AB. + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.org/license/LICENSE. + */ + +/* 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 <bsp.h> +#include <rtems/irq-extension.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 + */ +RTEMS_INLINE_ROUTINE int pci_interrupt_register(int irq, const char *info, + pci_isr isr, void *arg) +{ + return BSP_PCI_shared_interrupt_register(irq, info, 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 + */ +RTEMS_INLINE_ROUTINE int pci_interrupt_unregister(int irq, pci_isr isr, + void *arg) +{ + return BSP_PCI_shared_interrupt_unregister(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 + */ +RTEMS_INLINE_ROUTINE void pci_interrupt_unmask(int irq) +{ + BSP_PCI_shared_interrupt_unmask(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 + */ +RTEMS_INLINE_ROUTINE void pci_interrupt_mask(int irq) +{ + BSP_PCI_shared_interrupt_mask(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 + */ +RTEMS_INLINE_ROUTINE void pci_interrupt_clear(int irq) +{ + BSP_PCI_shared_interrupt_clear(irq); +} + +#endif /* !__PCI_IRQ_H__ */ |