FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_pcib.c

     /*-
      * Copyright (c) 2000 Michael Smith
      * Copyright (c) 2000 BSDi
      * All rights reserved.
      *
      * 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 AUTHOR 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 AUTHOR 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_acpi.h"
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/malloc.h>
    #include <sys/kernel.h>
    
    #include "acpi.h"
    #include <dev/acpica/acpivar.h>
    #include <dev/acpica/acpi_pcibvar.h>
    
    #include <dev/pci/pcivar.h>
    #include "pcib_if.h"
    
    /* Hooks for the ACPI CA debugging infrastructure. */
    #define _COMPONENT      ACPI_BUS
    ACPI_MODULE_NAME("PCI")
    
    ACPI_SERIAL_DECL(pcib, "ACPI PCI bus methods");
    
    /*
     * For locking, we assume the caller is not concurrent since this is
     * triggered by newbus methods.
     */
    int
    acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
    {
        device_t                    child;
        ACPI_STATUS                 status;
    
        ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
    
        /*
         * Don't attach if we're not really there.
         *
         * XXX: This isn't entirely correct since we may be a PCI bus
         * on a hot-plug docking station, etc.
         */
        if (!acpi_DeviceIsPresent(dev))
            return_VALUE(ENXIO);
    
        /*
         * Get the PCI interrupt routing table for this bus.  If we can't
         * get it, this is not an error but may reduce functionality.  There
         * are several valid bridges in the field that do not have a _PRT, so
         * only warn about missing tables if bootverbose is set.
         */
        prt->Length = ACPI_ALLOCATE_BUFFER;
        status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
        if (ACPI_FAILURE(status) && (bootverbose || status != AE_NOT_FOUND))
            device_printf(dev,
                "could not get PCI interrupt routing table for %s - %s\n",
                acpi_name(acpi_get_handle(dev)), AcpiFormatException(status));
    
        /*
         * Attach the PCI bus proper.
         */
        if ((child = device_add_child(dev, "pci", busno)) == NULL) {
            device_printf(device_get_parent(dev), "couldn't attach pci bus\n");
            return_VALUE(ENXIO);
        }
    
        /*
         * Now go scan the bus.
         */
        acpi_pci_link_config(dev, prt, busno);
    
        return_VALUE (bus_generic_attach(dev));
    }
    
   int
   acpi_pcib_resume(device_t dev)
   {
       acpi_pci_link_resume(dev);
       return (bus_generic_resume(dev));
   }
   
   /*
    * Route an interrupt for a child of the bridge.
    */
   int
   acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin)
   {
       struct acpi_prt_entry       *entry;
       int                         i, interrupt;
       struct acpi_pci_link_entry  *link;
       ACPI_PCI_ROUTING_TABLE      *prt;
   
       ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
   
       interrupt = PCI_INVALID_IRQ;
   
       /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */
       pin--;
   
       ACPI_SERIAL_BEGIN(pcib);
   
       /* Look up the PRT entry for this device. */
       entry = acpi_pci_find_prt(pcib, dev, pin);
       if (entry == NULL) {
           device_printf(pcib, "no PRT entry for %d.%d.INT%c\n", pci_get_bus(dev),
               pci_get_slot(dev), 'A' + pin);
           goto out;
       }
       prt = &entry->prt;
       link = entry->pci_link;
       if (bootverbose) {
           device_printf(pcib, "matched entry for %d.%d.INT%c",
               pci_get_bus(dev), pci_get_slot(dev), 'A' + pin);
           if (prt->Source[0] != '\0')
               printf(" (src %s)", acpi_name(entry->prt_source));
           printf("\n");
       }
   
       /*
        * If source is empty/NULL, the source index is a global IRQ number
        * and it's hard-wired so we're done.
        */
       if (prt->Source == NULL || prt->Source[0] == '\0') {
           if (bootverbose)
               device_printf(pcib, "slot %d INT%c hardwired to IRQ %d\n",
                   pci_get_slot(dev), 'A' + pin, prt->SourceIndex);
           if (prt->SourceIndex)
               interrupt = prt->SourceIndex;
           else
               device_printf(pcib, "error: invalid hard-wired IRQ of 0\n");
           goto out;
       }
   
       /* XXX Support for multiple resources must be added to the link code. */
       if (prt->SourceIndex) {
           device_printf(pcib, "src index %d not yet supported\n",
               prt->SourceIndex);
           goto out;
       }
   
       /* There has to be at least one interrupt available. */
       if (link->number_of_interrupts == 0) {
           device_printf(pcib, "device has no interrupts\n");
           goto out;
       }
   
       /* 
        * If the current interrupt has been routed, we're done.  This is the
        * case when the BIOS initializes it and we didn't disable it.
        */
       if (link->flags & ACPI_LINK_ROUTED) {
           interrupt = link->current_irq;
           if (bootverbose)
               device_printf(pcib, "slot %d INT%c is already routed to irq %d\n",
                   pci_get_slot(dev), 'A' + pin, interrupt);
           goto out;
       }
   
       if (bootverbose) {
           device_printf(pcib, "possible interrupts:");
           for (i = 0; i < link->number_of_interrupts; i++)
               printf("%3d", link->interrupts[i]);
           printf("\n");
       }
   
       /*
        * Perform the link routing.  The link code will pick the best IRQ
        * for this pin and configure it.
        */
       interrupt = acpi_pci_link_route(dev, entry);
   
       if (bootverbose && PCI_INTERRUPT_VALID(interrupt))
           device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
               pci_get_slot(dev), 'A' + pin, interrupt,
               acpi_name(entry->prt_source));
   
   out:
       ACPI_SERIAL_END(pcib);
   
       return_VALUE (interrupt);
   }

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