/*- * 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 1.60.8.1 2009/04/15 03:14:26 kensmith Exp $ */ #include "opt_acpi.h" #include #include #include #include #include #include #include "acpi.h" #include #include #include #include #include #include "pcib_if.h" /* Hooks for the ACPICA 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. */ struct prt_lookup_request { ACPI_PCI_ROUTING_TABLE *pr_entry; u_int pr_pin; u_int pr_slot; }; typedef void prt_entry_handler(ACPI_PCI_ROUTING_TABLE *entry, void *arg); static void prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg); static void prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg); static void prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg); static void prt_walk_table(ACPI_BUFFER *prt, prt_entry_handler *handler, void *arg) { ACPI_PCI_ROUTING_TABLE *entry; char *prtptr; /* First check to see if there is a table to walk. */ if (prt == NULL || prt->Pointer == NULL) return; /* Walk the table executing the handler function for each entry. */ prtptr = prt->Pointer; entry = (ACPI_PCI_ROUTING_TABLE *)prtptr; while (entry->Length != 0) { handler(entry, arg); prtptr += entry->Length; entry = (ACPI_PCI_ROUTING_TABLE *)prtptr; } } static void prt_attach_devices(ACPI_PCI_ROUTING_TABLE *entry, void *arg) { ACPI_HANDLE handle; device_t child, pcib; int error; /* We only care about entries that reference a link device. */ if (entry->Source == NULL || entry->Source[0] == '\0') return; /* * In practice, we only see SourceIndex's of 0 out in the wild. * When indices != 0 have been found, they've been bugs in the ASL. */ if (entry->SourceIndex != 0) return; /* Lookup the associated handle and device. */ pcib = (device_t)arg; if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, entry->Source, &handle))) return; child = acpi_get_device(handle); if (child == NULL) return; /* If the device hasn't been probed yet, force it to do so. */ error = device_probe_and_attach(child); if (error != 0) { device_printf(pcib, "failed to force attach of %s\n", acpi_name(handle)); return; } /* Add a reference for a specific bus/device/pin tuple. */ acpi_pci_link_add_reference(child, entry->SourceIndex, pcib, ACPI_ADR_PCI_SLOT(entry->Address), entry->Pin); } 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__); if (!acpi_DeviceIsPresent(dev)) { /* Caller should already have checked it */ panic("%s device is not present", __func__); } ACPI_SERIAL_INIT(pcib); /* * 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. */ prt_walk_table(prt, prt_attach_devices, dev); return_VALUE (bus_generic_attach(dev)); } int acpi_pcib_resume(device_t dev) { return (bus_generic_resume(dev)); } static void prt_lookup_device(ACPI_PCI_ROUTING_TABLE *entry, void *arg) { struct prt_lookup_request *pr; pr = (struct prt_lookup_request *)arg; if (pr->pr_entry != NULL) return; /* * 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 (ACPI_ADR_PCI_SLOT(entry->Address) == pr->pr_slot && entry->Pin == pr->pr_pin) pr->pr_entry = entry; } /* * Route an interrupt for a child of the bridge. */ int acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin, ACPI_BUFFER *prtbuf) { ACPI_PCI_ROUTING_TABLE *prt; struct prt_lookup_request pr; ACPI_HANDLE lnkdev; int interrupt; 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); /* Search for a matching entry in the routing table. */ pr.pr_entry = NULL; pr.pr_pin = pin; pr.pr_slot = pci_get_slot(dev); prt_walk_table(prtbuf, prt_lookup_device, &pr); if (pr.pr_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 = pr.pr_entry; 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 != NULL && prt->Source[0] != '\0') kprintf(" (src %s:%u)", prt->Source, prt->SourceIndex); kprintf("\n"); } /* * If source is empty/NULL, the source index is a GSI and it's hardwired * so we're done. * * XXX: If the source index is non-zero, ignore the source device and * assume that this is a hardwired entry. */ if (prt->Source == NULL || prt->Source[0] == '\0' || prt->SourceIndex != 0) { if (prt->SourceIndex) { interrupt = machintr_legacy_intr_find_bygsi(prt->SourceIndex, INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW); if (interrupt < 0) { device_printf(pcib, "slot %d INT%c hardwired to " "invalid GSI %d\n", pci_get_slot(dev), 'A' + pin, prt->SourceIndex); interrupt = PCI_INVALID_IRQ; goto out; } if (bootverbose) { device_printf(pcib, "slot %d INT%c hardwired to " "GSI %d, IRQ %d\n", pci_get_slot(dev), 'A' + pin, prt->SourceIndex, interrupt); } BUS_CONFIG_INTR(device_get_parent(dev), dev, interrupt, INTR_TRIGGER_LEVEL, INTR_POLARITY_LOW); } else { device_printf(pcib, "invalid hardwired GSI 0\n"); } 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; } interrupt = acpi_pci_link_route_interrupt(acpi_get_device(lnkdev), prt->SourceIndex); 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(lnkdev)); } out: ACPI_SERIAL_END(pcib); return_VALUE (interrupt); } int acpi_pcib_probe(device_t 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 ENXIO; if (pci_cfgregopen() == 0) return ENXIO; return 0; }