328 lines
11 KiB
C
328 lines
11 KiB
C
/*-
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* Copyright (c) 2000 Michael Smith
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* Copyright (c) 2000 BSDi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "opt_acpi.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include "acpi.h"
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#include <dev/acpica/acpivar.h>
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#include <dev/acpica/acpi_pcibvar.h>
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#include <machine/pci_cfgreg.h>
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#include <pci/pcivar.h>
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#include <pci/pcib_private.h>
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#include "pcib_if.h"
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/*
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* Hooks for the ACPI CA debugging infrastructure
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*/
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#define _COMPONENT ACPI_BUS
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ACPI_MODULE_NAME("PCI")
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int
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acpi_pcib_attach(device_t dev, ACPI_BUFFER *prt, int busno)
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{
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device_t child;
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ACPI_STATUS status;
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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/*
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* Don't attach if we're not really there.
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*
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* XXX: This isn't entirely correct since we may be a PCI bus
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* on a hot-plug docking station, etc.
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*/
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if (!acpi_DeviceIsPresent(dev))
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return_VALUE(ENXIO);
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/*
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* Get the PCI interrupt routing table for this bus.
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*/
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prt->Length = ACPI_ALLOCATE_BUFFER;
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status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt);
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if (ACPI_FAILURE(status))
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/* This is not an error, but it may reduce functionality. */
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device_printf(dev, "could not get PCI interrupt routing table - %s\n",
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AcpiFormatException(status));
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/*
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* Attach the PCI bus proper.
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*/
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if ((child = device_add_child(dev, "pci", busno)) == NULL) {
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device_printf(device_get_parent(dev), "couldn't attach pci bus");
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return_VALUE(ENXIO);
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}
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/*
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* Now go scan the bus.
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*/
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return_VALUE(bus_generic_attach(dev));
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}
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/*
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* Route an interrupt for a child of the bridge.
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*
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* XXX clean up error messages
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*
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* XXX this function is somewhat bulky
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*/
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int
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acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin,
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ACPI_BUFFER *prtbuf)
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{
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ACPI_PCI_ROUTING_TABLE *prt;
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ACPI_HANDLE lnkdev;
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ACPI_BUFFER crsbuf, prsbuf;
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ACPI_RESOURCE *crsres, *prsres, resbuf;
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ACPI_DEVICE_INFO devinfo;
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ACPI_STATUS status;
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u_int8_t *prtp;
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int interrupt;
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int i;
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ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
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crsbuf.Pointer = NULL;
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prsbuf.Pointer = NULL;
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interrupt = 255;
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/* ACPI numbers pins 0-3, not 1-4 like the BIOS */
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pin--;
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prtp = prtbuf->Pointer;
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if (prtp == NULL) /* didn't get routing table */
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goto out;
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/* scan the table looking for this device */
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for (;;) {
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prt = (ACPI_PCI_ROUTING_TABLE *)prtp;
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if (prt->Length == 0) /* end of table */
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goto out;
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/*
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* Compare the slot number (high word of Address) and pin number
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* (note that ACPI uses 0 for INTA) to check for a match.
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*
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* Note that the low word of the Address field (function number)
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* is required by the specification to be 0xffff. We don't risk
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* checking it here.
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*/
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if ((((prt->Address & 0xffff0000) >> 16) == pci_get_slot(dev)) &&
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(prt->Pin == pin)) {
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if (bootverbose)
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device_printf(pcib, "matched entry for %d.%d.INT%c (source %s)\n",
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pci_get_bus(dev), pci_get_slot(dev), 'A' + pin, prt->Source);
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break;
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}
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/* skip to next entry */
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prtp += prt->Length;
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}
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/*
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* If source is empty/NULL, the source index is the global IRQ number.
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*/
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if ((prt->Source == NULL) || (prt->Source[0] == '\0')) {
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if (bootverbose)
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device_printf(pcib, "device is hardwired to IRQ %d\n",
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prt->SourceIndex);
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interrupt = prt->SourceIndex;
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goto out;
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}
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/*
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* We have to find the source device (PCI interrupt link device)
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*/
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if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
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device_printf(pcib, "couldn't find PCI interrupt link device %s\n",
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prt->Source);
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goto out;
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}
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/*
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* Verify that this is a PCI link device, and that it's present.
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*/
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if (ACPI_FAILURE(AcpiGetObjectInfo(lnkdev, &devinfo))) {
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device_printf(pcib, "couldn't validate PCI interrupt link device %s\n",
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prt->Source);
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goto out;
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}
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if (!(devinfo.Valid & ACPI_VALID_HID) || strcmp("PNP0C0F", devinfo.HardwareId)) {
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device_printf(pcib, "PCI interrupt link device %s has wrong _HID (%s)\n",
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prt->Source, devinfo.HardwareId);
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goto out;
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}
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if (devinfo.Valid & ACPI_VALID_STA && (devinfo.CurrentStatus & 0x9) != 0x9) {
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device_printf(pcib, "PCI interrupt link device %s not present\n",
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prt->Source);
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goto out;
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}
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/*
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* Get the current and possible resources for the interrupt link device.
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*/
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crsbuf.Length = ACPI_ALLOCATE_BUFFER;
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if (ACPI_FAILURE(status = AcpiGetCurrentResources(lnkdev, &crsbuf))) {
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device_printf(pcib, "couldn't get PCI interrupt link device _CRS data - %s\n",
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AcpiFormatException(status));
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goto out; /* this is fatal */
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}
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prsbuf.Length = ACPI_ALLOCATE_BUFFER;
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if (ACPI_FAILURE(status = AcpiGetPossibleResources(lnkdev, &prsbuf))) {
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device_printf(pcib, "couldn't get PCI interrupt link device _PRS data - %s\n",
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AcpiFormatException(status));
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/* this is not fatal, since it may be hardwired */
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}
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ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "got %d bytes for %s._CRS\n", crsbuf.Length, acpi_name(lnkdev)));
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ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "got %d bytes for %s._PRS\n", prsbuf.Length, acpi_name(lnkdev)));
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/*
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* The interrupt may already be routed, so check _CRS first. We don't check the
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* 'decoding' bit in the _STA result, since there's nothing in the spec that
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* mandates it be set, however some BIOS' will set it if the decode is active.
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*
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* The Source Index points to the particular resource entry we're interested in.
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*/
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if (ACPI_FAILURE(acpi_FindIndexedResource(&crsbuf, prt->SourceIndex, &crsres))) {
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device_printf(pcib, "_CRS buffer corrupt, cannot route interrupt\n");
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goto out;
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}
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/* type-check the resource we've got */
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if (crsres->Id != ACPI_RSTYPE_IRQ) { /* XXX ACPI_RSTYPE_EXT_IRQ */
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device_printf(pcib, "_CRS resource entry has unsupported type %d\n",
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crsres->Id);
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goto out;
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}
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/* if there's more than one interrupt, we are confused */
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if (crsres->Data.Irq.NumberOfInterrupts > 1) {
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device_printf(pcib, "device has too many interrupts (%d)\n",
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crsres->Data.Irq.NumberOfInterrupts);
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goto out;
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}
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/*
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* If there's only one interrupt, and it's not zero, then we're already routed.
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*
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* Note that we could also check the 'decoding' bit in _STA, but can't depend on
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* it since it's not part of the spec.
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*
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* XXX check ASL examples to see if this is an acceptable set of tests
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*/
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if ((crsres->Data.Irq.NumberOfInterrupts == 1) && (crsres->Data.Irq.Interrupts[0] != 0)) {
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device_printf(pcib, "slot %d INT%c is routed to irq %d\n",
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pci_get_slot(dev), 'A' + pin, crsres->Data.Irq.Interrupts[0]);
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interrupt = crsres->Data.Irq.Interrupts[0];
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goto out;
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}
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/*
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* There isn't an interrupt, so we have to look at _PRS to get one.
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* Get the set of allowed interrupts from the _PRS resource indexed by SourceIndex.
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*/
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if (prsbuf.Pointer == NULL) {
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device_printf(pcib, "device has no routed interrupt and no _PRS on PCI interrupt link device\n");
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goto out;
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}
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if (ACPI_FAILURE(acpi_FindIndexedResource(&prsbuf, prt->SourceIndex, &prsres))) {
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device_printf(pcib, "_PRS buffer corrupt, cannot route interrupt\n");
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goto out;
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}
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/* type-check the resource we've got */
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if (prsres->Id != ACPI_RSTYPE_IRQ) { /* XXX ACPI_RSTYPE_EXT_IRQ */
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device_printf(pcib, "_PRS resource entry has unsupported type %d\n",
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prsres->Id);
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goto out;
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}
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/* there has to be at least one interrupt available */
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if (prsres->Data.Irq.NumberOfInterrupts < 1) {
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device_printf(pcib, "device has no interrupts\n");
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goto out;
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}
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/*
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* Pick an interrupt to use. Note that a more scientific approach than just
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* taking the first one available would be desirable.
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*
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* The PCI BIOS $PIR table offers "preferred PCI interrupts", but ACPI doesn't
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* seem to offer a similar mechanism, so picking a "good" interrupt here is a
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* difficult task.
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*
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* Build a resource buffer and pass it to AcpiSetCurrentResources to route the
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* new interrupt.
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*/
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device_printf(pcib, "possible interrupts:");
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for (i = 0; i < prsres->Data.Irq.NumberOfInterrupts; i++)
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printf(" %d", prsres->Data.Irq.Interrupts[i]);
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printf("\n");
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if (crsbuf.Pointer != NULL) /* should never happen */
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AcpiOsFree(crsbuf.Pointer);
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crsbuf.Pointer = NULL;
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resbuf.Id = ACPI_RSTYPE_IRQ;
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resbuf.Length = ACPI_SIZEOF_RESOURCE(ACPI_RESOURCE_IRQ);
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resbuf.Data.Irq = prsres->Data.Irq; /* structure copy other fields */
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resbuf.Data.Irq.NumberOfInterrupts = 1;
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resbuf.Data.Irq.Interrupts[0] = prsres->Data.Irq.Interrupts[0]; /* just take first... */
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if (ACPI_FAILURE(status = acpi_AppendBufferResource(&crsbuf, &resbuf))) {
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device_printf(pcib, "couldn't route interrupt %d via %s, interrupt resource build failed - %s\n",
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prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev), AcpiFormatException(status));
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goto out;
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}
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if (ACPI_FAILURE(status = AcpiSetCurrentResources(lnkdev, &crsbuf))) {
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device_printf(pcib, "couldn't route interrupt %d via %s - %s\n",
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prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev), AcpiFormatException(status));
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goto out;
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}
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/* successful, return the interrupt we just routed */
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device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n",
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pci_get_slot(dev), 'A' + pin, prsres->Data.Irq.Interrupts[0],
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acpi_name(lnkdev));
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interrupt = prsres->Data.Irq.Interrupts[0];
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out:
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if (crsbuf.Pointer != NULL)
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AcpiOsFree(crsbuf.Pointer);
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if (prsbuf.Pointer != NULL)
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AcpiOsFree(prsbuf.Pointer);
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/* XXX APIC_IO interrupt mapping? */
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return_VALUE(interrupt);
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}
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