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freebsd-skq/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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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 <dev/pci/pcivar.h>
#include <dev/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. 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 (source %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 device %s has wrong _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, "couldn't get PCI interrupt link device _CRS data - %s\n",
AcpiFormatException(status));
goto out;
}
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));
}
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_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, "couldn't route interrupt %d via %s, interrupt resource build failed - %s\n",
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",
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);
}
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