/*- * 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. * * $FreeBSD$ */ #include "opt_acpi.h" #include #include #include #include #include "acpi.h" #include #include #include #include #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. */ prt->Length = ACPI_ALLOCATE_BUFFER; status = AcpiGetIrqRoutingTable(acpi_get_handle(dev), prt); if (ACPI_FAILURE(status)) /* This is not an error, but it may reduce functionality. */ 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"); 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; ACPI_RESOURCE *crsres, *prsres, resbuf; ACPI_DEVICE_INFO devinfo; ACPI_STATUS status; u_int8_t *prtp; int interrupt; int i; ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); crsbuf.Pointer = NULL; prsbuf.Pointer = NULL; interrupt = 255; /* ACPI numbers pins 0-3, not 1-4 like the BIOS */ pin--; prtp = prtbuf->Pointer; if (prtp == NULL) /* didn't get routing table */ goto out; /* scan the table looking for this device */ for (;;) { prt = (ACPI_PCI_ROUTING_TABLE *)prtp; if (prt->Length == 0) /* end of table */ 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 (source %s)\n", pci_get_bus(dev), pci_get_slot(dev), 'A' + pin, prt->Source); break; } /* skip to 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. */ if (ACPI_FAILURE(AcpiGetObjectInfo(lnkdev, &devinfo))) { device_printf(pcib, "couldn't validate PCI interrupt link device %s\n", prt->Source); goto out; } if (!(devinfo.Valid & ACPI_VALID_HID) || strcmp("PNP0C0F", devinfo.HardwareId)) { device_printf(pcib, "PCI interrupt link device %s has wrong _HID (%s)\n", prt->Source, devinfo.HardwareId); goto out; } if (devinfo.Valid & ACPI_VALID_STA && (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. */ crsbuf.Length = ACPI_ALLOCATE_BUFFER; if (ACPI_FAILURE(status = AcpiGetCurrentResources(lnkdev, &crsbuf))) { device_printf(pcib, "couldn't get PCI interrupt link device _CRS data - %s\n", AcpiFormatException(status)); goto out; /* this is fatal */ } prsbuf.Length = ACPI_ALLOCATE_BUFFER; if (ACPI_FAILURE(status = AcpiGetPossibleResources(lnkdev, &prsbuf))) { device_printf(pcib, "couldn't get PCI interrupt link device _PRS data - %s\n", AcpiFormatException(status)); /* this is not fatal, since it may be hardwired */ } 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 got */ if (crsres->Id != ACPI_RSTYPE_IRQ) { /* XXX ACPI_RSTYPE_EXT_IRQ */ device_printf(pcib, "_CRS resource entry has unsupported type %d\n", crsres->Id); goto out; } /* if there's more than one interrupt, we are confused */ if (crsres->Data.Irq.NumberOfInterrupts > 1) { device_printf(pcib, "device has too many interrupts (%d)\n", crsres->Data.Irq.NumberOfInterrupts); goto out; } /* * If there's only one interrupt, and it's not zero, then we're 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 ((crsres->Data.Irq.NumberOfInterrupts == 1) && (crsres->Data.Irq.Interrupts[0] != 0)) { device_printf(pcib, "slot %d INT%c is routed to irq %d\n", pci_get_slot(dev), 'A' + pin, crsres->Data.Irq.Interrupts[0]); interrupt = crsres->Data.Irq.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, "device has no routed interrupt and no _PRS on PCI interrupt link device\n"); goto out; } if (ACPI_FAILURE(acpi_FindIndexedResource(&prsbuf, prt->SourceIndex, &prsres))) { device_printf(pcib, "_PRS buffer corrupt, cannot route interrupt\n"); goto out; } /* type-check the resource we've got */ if (prsres->Id != ACPI_RSTYPE_IRQ) { /* XXX ACPI_RSTYPE_EXT_IRQ */ device_printf(pcib, "_PRS resource entry has unsupported type %d\n", prsres->Id); goto out; } /* there has to be at least one interrupt available */ if (prsres->Data.Irq.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 < prsres->Data.Irq.NumberOfInterrupts; i++) printf(" %d", prsres->Data.Irq.Interrupts[i]); printf("\n"); if (crsbuf.Pointer != NULL) /* should never happen */ AcpiOsFree(crsbuf.Pointer); crsbuf.Pointer = NULL; resbuf.Id = ACPI_RSTYPE_IRQ; resbuf.Length = ACPI_SIZEOF_RESOURCE(ACPI_RESOURCE_IRQ); resbuf.Data.Irq = prsres->Data.Irq; /* structure copy other fields */ resbuf.Data.Irq.NumberOfInterrupts = 1; resbuf.Data.Irq.Interrupts[0] = prsres->Data.Irq.Interrupts[0]; /* just take first... */ if (ACPI_FAILURE(status = acpi_AppendBufferResource(&crsbuf, &resbuf))) { device_printf(pcib, "couldn't route interrupt %d via %s, interrupt resource build failed - %s\n", prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev), AcpiFormatException(status)); goto out; } if (ACPI_FAILURE(status = AcpiSetCurrentResources(lnkdev, &crsbuf))) { device_printf(pcib, "couldn't route interrupt %d via %s - %s\n", prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev), AcpiFormatException(status)); goto out; } /* successful, 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, prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev)); interrupt = prsres->Data.Irq.Interrupts[0]; out: if (crsbuf.Pointer != NULL) AcpiOsFree(crsbuf.Pointer); if (prsbuf.Pointer != NULL) AcpiOsFree(prsbuf.Pointer); /* XXX APIC_IO interrupt mapping? */ return_VALUE(interrupt); }