/*- * 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 "pcib_if.h" /* * Hooks for the ACPI CA debugging infrastructure */ #define _COMPONENT ACPI_BUS MODULE_NAME("PCI") struct acpi_pcib_softc { device_t ap_dev; ACPI_HANDLE ap_handle; int ap_segment; /* analagous to Alpha 'hose' */ int ap_bus; /* bios-assigned bus number */ ACPI_BUFFER ap_prt; /* interrupt routing table */ }; static int acpi_pcib_probe(device_t bus); static int acpi_pcib_attach(device_t bus); static int acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result); static int acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value); static int acpi_pcib_maxslots(device_t dev); static u_int32_t acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes); static void acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, u_int32_t data, int bytes); static int acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin); static device_method_t acpi_pcib_methods[] = { /* Device interface */ DEVMETHOD(device_probe, acpi_pcib_probe), DEVMETHOD(device_attach, acpi_pcib_attach), DEVMETHOD(device_shutdown, bus_generic_shutdown), DEVMETHOD(device_suspend, bus_generic_suspend), DEVMETHOD(device_resume, bus_generic_resume), /* Bus interface */ DEVMETHOD(bus_print_child, bus_generic_print_child), DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar), DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar), DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource), DEVMETHOD(bus_release_resource, bus_generic_release_resource), DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), /* pcib interface */ DEVMETHOD(pcib_maxslots, acpi_pcib_maxslots), DEVMETHOD(pcib_read_config, acpi_pcib_read_config), DEVMETHOD(pcib_write_config, acpi_pcib_write_config), DEVMETHOD(pcib_route_interrupt, acpi_pcib_route_interrupt), {0, 0} }; static driver_t acpi_pcib_driver = { "acpi_pcib", acpi_pcib_methods, sizeof(struct acpi_pcib_softc), }; devclass_t acpi_pcib_devclass; DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_driver, acpi_pcib_devclass, 0, 0); static int acpi_pcib_probe(device_t dev) { if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) && !acpi_disabled("pci") && acpi_MatchHid(dev, "PNP0A03")) { /* * Set device description */ device_set_desc(dev, "Host-PCI bridge"); return(0); } return(ENXIO); } static int acpi_pcib_attach(device_t dev) { struct acpi_pcib_softc *sc; device_t child; ACPI_STATUS status; int result; FUNCTION_TRACE(__func__); sc = device_get_softc(dev); sc->ap_dev = dev; sc->ap_handle = acpi_get_handle(dev); /* * 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 our segment number by evaluating _SEG * It's OK for this to not exist. */ if ((status = acpi_EvaluateInteger(sc->ap_handle, "_SEG", &sc->ap_segment)) != AE_OK) { if (status != AE_NOT_FOUND) { device_printf(dev, "could not evaluate _SEG - %s\n", AcpiFormatException(status)); return_VALUE(ENXIO); } /* if it's not found, assume 0 */ sc->ap_segment = 0; } /* * Get our base bus number by evaluating _BBN * If this doesn't exist, we assume we're bus number 0. * * XXX note that it may also not exist in the case where we are * meant to use a private configuration space mechanism for this bus, * so we should dig out our resources and check to see if we have * anything like that. How do we do this? * XXX If we have the requisite information, and if we don't think the * default PCI configuration space handlers can deal with this bus, * we should attach our own handler. * XXX invoke _REG on this for the PCI config space address space? */ if ((status = acpi_EvaluateInteger(sc->ap_handle, "_BBN", &sc->ap_bus)) != AE_OK) { if (status != AE_NOT_FOUND) { device_printf(dev, "could not evaluate _BBN - %s\n", AcpiFormatException(status)); return_VALUE(ENXIO); } /* if it's not found, assume 0 */ sc->ap_bus = 0; } /* * Make sure that this bus hasn't already been found. If it has, return silently * (should we complain here?). */ if (devclass_get_device(devclass_find("pci"), sc->ap_bus) != NULL) return_VALUE(0); /* * Get the PCI interrupt routing table. */ if ((status = acpi_GetIntoBuffer(sc->ap_handle, AcpiGetIrqRoutingTable, &sc->ap_prt)) != AE_OK) { device_printf(dev, "could not get PCI interrupt routing table - %s\n", AcpiFormatException(status)); /* this is not an error, but it may reduce functionality */ } /* * Attach the PCI bus proper. */ if ((child = device_add_child(dev, "pci", sc->ap_bus)) == NULL) { device_printf(device_get_parent(dev), "couldn't attach pci bus"); return_VALUE(ENXIO); } /* * Now go scan the bus. * * XXX It would be nice to defer this and count on the nexus getting it * after the first pass, but this does not seem to be reliable. */ result = bus_generic_attach(dev); /* * XXX cross-reference our children to attached devices on the child bus * via _ADR, so we can provide power management. */ /* XXX implement */ return_VALUE(result); } /* * ACPI doesn't tell us how many slots there are, so use the standard * maximum. */ static int acpi_pcib_maxslots(device_t dev) { return(PCI_SLOTMAX); } /* * Support for standard PCI bridge ivars. */ static int acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) { struct acpi_pcib_softc *sc = device_get_softc(dev); switch (which) { case PCIB_IVAR_BUS: *result = sc->ap_bus; return(0); } return(ENOENT); } static int acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value) { struct acpi_pcib_softc *sc = device_get_softc(dev); switch (which) { case PCIB_IVAR_BUS: sc->ap_bus = value; return(0); } return(ENOENT); } static u_int32_t acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes) { return(pci_cfgregread(bus, slot, func, reg, bytes)); } static void acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, u_int32_t data, int bytes) { pci_cfgregwrite(bus, slot, func, reg, data, bytes); } /* * Route an interrupt for a child of the bridge. * * XXX clean up error messages * * XXX this function is somewhat bulky */ static int acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin) { struct acpi_pcib_softc *sc; 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; device_t *devlist; int devcount; int bus; int interrupt; int i; crsbuf.Pointer = NULL; prsbuf.Pointer = NULL; devlist = NULL; interrupt = 255; /* ACPI numbers pins 0-3, not 1-4 like the BIOS */ pin--; /* find the bridge softc */ if (devclass_get_devices(acpi_pcib_devclass, &devlist, &devcount)) goto out; BUS_READ_IVAR(pcib, pcib, PCIB_IVAR_BUS, (uintptr_t *)&bus); sc = NULL; for (i = 0; i < devcount; i++) { sc = device_get_softc(*(devlist + i)); if (sc->ap_bus == bus) break; sc = NULL; } if (sc == NULL) /* not one of ours */ goto out; prtp = sc->ap_prt.Pointer; if (prtp == NULL) /* didn't get routing table */ goto out; /* scan the table looking for this device */ for (;;) { prt = (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)) { device_printf(sc->ap_dev, "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')) { device_printf(sc->ap_dev, "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(sc->ap_dev, "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(sc->ap_dev, "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(sc->ap_dev, "PCI interrupt link device %s has wrong _HID (%s)\n", prt->Source, devinfo.HardwareId); goto out; } /* should be 'present' and 'functioning' */ if ((devinfo.CurrentStatus & 0x09) != 0x09) { device_printf(sc->ap_dev, "PCI interrupt link device %s unavailable (CurrentStatus 0x%x)\n", prt->Source, devinfo.CurrentStatus); goto out; } /* * Get the current and possible resources for the interrupt link device. */ if (ACPI_FAILURE(status = acpi_GetIntoBuffer(lnkdev, AcpiGetCurrentResources, &crsbuf))) { device_printf(sc->ap_dev, "couldn't get PCI interrupt link device _CRS data - %s\n", AcpiFormatException(status)); goto out; /* this is fatal */ } if ((status = acpi_GetIntoBuffer(lnkdev, AcpiGetPossibleResources, &prsbuf)) != AE_OK) { device_printf(sc->ap_dev, "couldn't get PCI interrupt link device _PRS data - %s\n", AcpiFormatException(status)); /* this is not fatal, since it may be hardwired */ } DEBUG_PRINT(TRACE_RESOURCES, ("got %d bytes for %s._CRS\n", crsbuf.Length, acpi_name(lnkdev))); DEBUG_PRINT(TRACE_RESOURCES, ("got %d bytes for %s._PRS\n", 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(sc->ap_dev, "_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(sc->ap_dev, "_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(sc->ap_dev, "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(sc->ap_dev, "device is routed to IRQ %d\n", 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(sc->ap_dev, "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(sc->ap_dev, "_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(sc->ap_dev, "_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(sc->ap_dev, "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(sc->ap_dev, "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 = 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(sc->ap_dev, "couldn't route interrupt %d via %s, interupt 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(sc->ap_dev, "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(sc->ap_dev, "routed interrupt %d via %s\n", prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev)); interrupt = prsres->Data.Irq.Interrupts[0]; out: if (devlist != NULL) free(devlist, M_TEMP); if (crsbuf.Pointer != NULL) AcpiOsFree(crsbuf.Pointer); if (prsbuf.Pointer != NULL) AcpiOsFree(prsbuf.Pointer); /* XXX APIC_IO interrupt mapping? */ return(interrupt); }