/*- * 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. * * $FreeBSD: src/sys/dev/acpica/acpi_pcib.c,v 1.43 2004/05/06 02:18:58 njl Exp $ * $DragonFly: src/sys/dev/acpica5/acpi_pcib.c,v 1.2 2004/06/27 08:52:39 dillon Exp $ */ #include "opt_acpi.h" #include #include #include #include #include "acpi.h" #include "acpivar.h" #include "acpi_pcibvar.h" #include #include "pcib_if.h" /* Hooks for the ACPI CA debugging infrastructure. */ #define _COMPONENT ACPI_BUS ACPI_MODULE_NAME("PCI") 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. */ prt->Length = ACPI_ALLOCATE_BUFFER; status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt); if (ACPI_FAILURE(status)) 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_BUFFER *prt, int busno) { acpi_pci_link_resume(dev, prt, busno); return (bus_generic_resume(dev)); } /* * Route an interrupt for a child of the bridge. * * XXX clean up error messages * * XXX this function is somewhat bulky */ int acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin, ACPI_BUFFER *prtbuf) { ACPI_PCI_ROUTING_TABLE *prt; ACPI_HANDLE lnkdev; ACPI_BUFFER crsbuf, prsbuf, buf; ACPI_RESOURCE *crsres, *prsres, resbuf; ACPI_DEVICE_INFO *devinfo; ACPI_STATUS status; UINT32 NumberOfInterrupts; UINT32 *Interrupts; u_int8_t *prtp; int interrupt; int i; ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); buf.Pointer = NULL; crsbuf.Pointer = NULL; prsbuf.Pointer = NULL; interrupt = 255; /* ACPI numbers pins 0-3, not 1-4 like the BIOS. */ pin--; /* We failed to retrieve the routing table. */ prtp = prtbuf->Pointer; if (prtp == NULL) goto out; /* Scan the table to look for this device. */ for (;;) { prt = (ACPI_PCI_ROUTING_TABLE *)prtp; /* We hit the end of the table. */ if (prt->Length == 0) goto out; /* * Compare the slot number (high word of Address) and pin number * (note that ACPI uses 0 for INTA) to check for a match. * * Note that the low word of the Address field (function number) * is required by the specification to be 0xffff. We don't risk * checking it here. */ if (((prt->Address & 0xffff0000) >> 16) == pci_get_slot(dev) && prt->Pin == pin) { if (bootverbose) device_printf(pcib, "matched entry for %d.%d.INT%c (src %s)\n", pci_get_bus(dev), pci_get_slot(dev), 'A' + pin, prt->Source); break; } /* Skip to the next entry. */ prtp += prt->Length; } /* * If source is empty/NULL, the source index is the global IRQ number. */ if (prt->Source == NULL || prt->Source[0] == '\0') { if (bootverbose) device_printf(pcib, "device is hardwired to IRQ %d\n", prt->SourceIndex); interrupt = prt->SourceIndex; goto out; } /* * We have to find the source device (PCI interrupt link device). */ if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) { device_printf(pcib, "couldn't find PCI interrupt link device %s\n", prt->Source); goto out; } /* * Verify that this is a PCI link device and that it's present. */ buf.Length = ACPI_ALLOCATE_BUFFER; if (ACPI_FAILURE(AcpiGetObjectInfo(lnkdev, &buf))) { device_printf(pcib, "couldn't validate PCI interrupt link device %s\n", prt->Source); goto out; } devinfo = (ACPI_DEVICE_INFO *)buf.Pointer; if ((devinfo->Valid & ACPI_VALID_HID) == 0 || strcmp("PNP0C0F", devinfo->HardwareId.Value) != 0) { device_printf(pcib, "PCI interrupt link %s has invalid _HID (%s)\n", prt->Source, devinfo->HardwareId.Value); goto out; } if ((devinfo->Valid & ACPI_VALID_STA) != 0 && (devinfo->CurrentStatus & 0x9) != 0x9) { device_printf(pcib, "PCI interrupt link device %s not present\n", prt->Source); goto out; } /* * Get the current and possible resources for the interrupt link device. * If we fail to get the current resources, this is a fatal error. */ crsbuf.Length = ACPI_ALLOCATE_BUFFER; if (ACPI_FAILURE(status = AcpiGetCurrentResources(lnkdev, &crsbuf))) { device_printf(pcib, "PCI interrupt link device _CRS failed - %s\n", AcpiFormatException(status)); goto out; } prsbuf.Length = ACPI_ALLOCATE_BUFFER; if (ACPI_FAILURE(status = AcpiGetPossibleResources(lnkdev, &prsbuf))) { device_printf(pcib, "PCI interrupt link device _PRS failed - %s\n", AcpiFormatException(status)); } ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "got %ld bytes for %s._CRS\n", (long)crsbuf.Length, acpi_name(lnkdev))); ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, "got %ld bytes for %s._PRS\n", (long)prsbuf.Length, acpi_name(lnkdev))); /* * The interrupt may already be routed, so check _CRS first. We don't * check the 'decoding' bit in the _STA result, since there's nothing in * the spec that mandates it be set, however some BIOS' will set it if * the decode is active. * * The Source Index points to the particular resource entry we're * interested in. */ if (ACPI_FAILURE(acpi_FindIndexedResource(&crsbuf, prt->SourceIndex, &crsres))) { device_printf(pcib, "_CRS buffer corrupt, cannot route interrupt\n"); goto out; } /* Type-check the resource we've found. */ if (crsres->Id != ACPI_RSTYPE_IRQ && crsres->Id != ACPI_RSTYPE_EXT_IRQ) { device_printf(pcib, "_CRS resource entry has unsupported type %d\n", crsres->Id); goto out; } /* Set variables based on resource type. */ if (crsres->Id == ACPI_RSTYPE_IRQ) { NumberOfInterrupts = crsres->Data.Irq.NumberOfInterrupts; Interrupts = crsres->Data.Irq.Interrupts; } else { NumberOfInterrupts = crsres->Data.ExtendedIrq.NumberOfInterrupts; Interrupts = crsres->Data.ExtendedIrq.Interrupts; } /* If there's more than one interrupt, this is an error. */ if (NumberOfInterrupts > 1) { device_printf(pcib, "device has too many interrupts (%d)\n", NumberOfInterrupts); goto out; } /* * If there's only one interrupt, and it's not zero, then it's already * routed. * * Note that we could also check the 'decoding' bit in _STA, but can't * depend on it since it's not part of the spec. * * XXX check ASL examples to see if this is an acceptable set of tests */ if (NumberOfInterrupts == 1 && Interrupts[0] != 0) { device_printf(pcib, "slot %d INT%c is routed to irq %d\n", pci_get_slot(dev), 'A' + pin, Interrupts[0]); interrupt = Interrupts[0]; goto out; } /* * There isn't an interrupt, so we have to look at _PRS to get one. * Get the set of allowed interrupts from the _PRS resource indexed * by SourceIndex. */ if (prsbuf.Pointer == NULL) { device_printf(pcib, "no routed irq and no _PRS on irq link device\n"); goto out; } /* * Search through the _PRS resources, looking for an IRQ or extended * IRQ resource. Skip dependent function resources for now. In the * future, we might use these for priority but this is good enough for * now until BIOS vendors actually mean something by using them. */ prsres = NULL; for (i = prt->SourceIndex; prsres == NULL; i++) { if (ACPI_FAILURE(acpi_FindIndexedResource(&prsbuf, i, &prsres))) { device_printf(pcib, "_PRS lacks IRQ resource, routing failed\n"); goto out; } switch (prsres->Id) { case ACPI_RSTYPE_IRQ: NumberOfInterrupts = prsres->Data.Irq.NumberOfInterrupts; Interrupts = prsres->Data.Irq.Interrupts; break; case ACPI_RSTYPE_EXT_IRQ: NumberOfInterrupts = prsres->Data.ExtendedIrq.NumberOfInterrupts; Interrupts = prsres->Data.ExtendedIrq.Interrupts; break; case ACPI_RSTYPE_START_DPF: prsres = NULL; continue; default: device_printf(pcib, "_PRS has invalid type %d\n", prsres->Id); goto out; } } /* There has to be at least one interrupt available. */ if (NumberOfInterrupts < 1) { device_printf(pcib, "device has no interrupts\n"); goto out; } /* * Pick an interrupt to use. Note that a more scientific approach than * just taking the first one available would be desirable. * * The PCI BIOS $PIR table offers "preferred PCI interrupts", but ACPI * doesn't seem to offer a similar mechanism, so picking a "good" * interrupt here is a difficult task. * * Build a resource buffer and pass it to AcpiSetCurrentResources to * route the new interrupt. */ device_printf(pcib, "possible interrupts:"); for (i = 0; i < NumberOfInterrupts; i++) printf(" %d", Interrupts[i]); printf("\n"); /* This should never happen. */ if (crsbuf.Pointer != NULL) AcpiOsFree(crsbuf.Pointer); /* XXX Data.Irq and Data.ExtendedIrq are implicitly structure-copied. */ crsbuf.Pointer = NULL; if (prsres->Id == ACPI_RSTYPE_IRQ) { resbuf.Id = ACPI_RSTYPE_IRQ; resbuf.Length = ACPI_SIZEOF_RESOURCE(ACPI_RESOURCE_IRQ); resbuf.Data.Irq = prsres->Data.Irq; resbuf.Data.Irq.NumberOfInterrupts = 1; resbuf.Data.Irq.Interrupts[0] = Interrupts[0]; } else { resbuf.Id = ACPI_RSTYPE_EXT_IRQ; resbuf.Length = ACPI_SIZEOF_RESOURCE(ACPI_RESOURCE_EXT_IRQ); resbuf.Data.ExtendedIrq = prsres->Data.ExtendedIrq; resbuf.Data.ExtendedIrq.NumberOfInterrupts = 1; resbuf.Data.ExtendedIrq.Interrupts[0] = Interrupts[0]; } if (ACPI_FAILURE(status = acpi_AppendBufferResource(&crsbuf, &resbuf))) { device_printf(pcib, "buf append failed for interrupt %d via %s - %s\n", Interrupts[0], acpi_name(lnkdev), AcpiFormatException(status)); goto out; } /* XXX Figure out how this is happening when the append succeeds. */ if (crsbuf.Pointer == NULL) { device_printf(pcib, "_CRS buf NULL after append?\n"); goto out; } if (ACPI_FAILURE(status = AcpiSetCurrentResources(lnkdev, &crsbuf))) { device_printf(pcib, "_SRS failed for interrupt %d via %s - %s\n", Interrupts[0], acpi_name(lnkdev), AcpiFormatException(status)); goto out; } /* Return the interrupt we just routed. */ device_printf(pcib, "slot %d INT%c routed to irq %d via %s\n", pci_get_slot(dev), 'A' + pin, Interrupts[0], acpi_name(lnkdev)); interrupt = Interrupts[0]; out: if (crsbuf.Pointer != NULL) AcpiOsFree(crsbuf.Pointer); if (prsbuf.Pointer != NULL) AcpiOsFree(prsbuf.Pointer); if (buf.Pointer != NULL) AcpiOsFree(buf.Pointer); /* XXX APIC_IO interrupt mapping? */ return_VALUE (interrupt); }