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-rw-r--r--sys/dev/acpica/acpi_pcib.c338
1 files changed, 338 insertions, 0 deletions
diff --git a/sys/dev/acpica/acpi_pcib.c b/sys/dev/acpica/acpi_pcib.c
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--- /dev/null
+++ b/sys/dev/acpica/acpi_pcib.c
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+/*-
+ * 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 <sys/param.h>
+#include <sys/bus.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+
+#include "acpi.h"
+
+#include <dev/acpica/acpivar.h>
+#include <dev/acpica/acpi_pcibvar.h>
+
+#include <machine/pci_cfgreg.h>
+#include <pci/pcivar.h>
+#include <pci/pcib_private.h>
+#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\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;
+ 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);
+}
+
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