PCI_INTR(9)            NetBSD Kernel Developer's Manual            PCI_INTR(9)

NAME
     pci_intr, pci_intr_map, pci_intr_string, pci_intr_establish,
     pci_intr_disestablish -- PCI bus interrupt manipulation functions

SYNOPSIS
     #include <dev/pci/pcivar.h>

     int
     pci_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ih);

     const char *
     pci_intr_string(pci_chipset_t *pc, pci_intr_handle_t ih);

     void *
     pci_intr_establish(pci_chipset_t *pc, pci_intr_handle_t ih, int ipl,
         int (*intrhand)(void *), void *intrarg);

     void
     pci_intr_disestablish(pci_chipset_t *pc, void *ih);

DESCRIPTION
     The pci_intr functions exist to allow device drivers machine-independent
     access to PCI bus interrupts.  The functions described in this page are
     typically declared in a port's <machine/pci_machdep.h> header file; how-
     ever, drivers should generally include <dev/pci/pcivar.h> to get other
     PCI-specific declarations as well.

     Each driver has an attach() function which has a bus-specific attach_args
     structure.  Each driver for a PCI device is passed a pointer to an object
     of type struct pci_attach_args which contains, among other things, infor-
     mation about the location of the device in the PCI bus topology suffi-
     cient to allow interrupts from the device to be handled.

     If a driver wishes to establish an interrupt handler for the device, it
     should pass the struct pci_attach_args * to the pci_intr_map() function,
     which returns zero on success, and nonzero on failure.  The function sets
     the pci_intr_handle_t pointed at by its second argument to a machine-
     dependent value which identifies a particular interrupt source.

     If the driver wishes to refer to the interrupt source in an attach or
     error message, it should use the value returned by pci_intr_string().

     Subsequently, when the driver is prepared to receive interrupts, it
     should call pci_intr_establish() to actually establish the handler; when
     the device interrupts, intrhand will be called with a single argument
     intrarg, and will run at the interrupt priority level ipl.

     The return value of pci_intr_establish() may be saved and passed to
     pci_intr_disestablish() to disable the interrupt handler when the driver
     is no longer interested in interrupts from the device.

   PORTING
     A port's implementation of pci_intr_map() may use the following members
     of struct pci_attach_args to determine how the device's interrupts are
     routed.

             pci_chipset_tag_t pa_pc;
             pcitag_t pa_tag;
             pcitag_t pa_intrtag; /* intr. appears to come from here */
             pci_intr_pin_t pa_intrpin; /* intr. appears on this pin */
             pci_intr_line_t pa_intrline; /* intr. routing information */
             pci_intr_pin_t pa_rawintrpin; /* unswizzled pin */

     PCI-PCI bridges swizzle (permute) interrupt wiring.  Depending on imple-
     mentation details, it may be more convenient to use either original or
     the swizzled interrupt parameters.  The original device tag and interrupt
     pin can be found in pa_tag and pa_rawintrpin respectively, while the
     swizzled tag and pin can be found in pa_intrtag and pa_intrpin.

     When a device is attached to a primary bus, both pairs of fields contain
     the same values.  When a device is found behind one or more pci-pci
     bridges, pa_intrpin contains the ``swizzled'' interrupt pin number, while
     pa_rawintrpin contains the original interrupt pin; pa_tag contains the
     PCI tag of the device itself, and pa_intrtag contains the PCI tag of the
     uppermost bridge device.

NetBSD 5.0.1                     May 19, 2002                     NetBSD 5.0.1

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