4fa387b692
PCI bus object. This should deal both with already-routed interrupts as well as devices that need an interrupt routed. Note that it *doesn't* deal with interlocked interrupt dependancies, nor does it select between interrupt options in a smart way. These are optimisations that need further work.
504 lines
16 KiB
C
504 lines
16 KiB
C
/*-
|
|
* 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 <machine/pci_cfgreg.h>
|
|
#include <pci/pcivar.h>
|
|
#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", acpi_strerror(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", acpi_strerror(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", acpi_strerror(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;
|
|
ACPI_DEVICE_INFO devinfo;
|
|
ACPI_OBJECT_LIST objectlist;
|
|
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",
|
|
acpi_strerror(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",
|
|
acpi_strerror(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((ACPI_RESOURCE *)crsbuf.Pointer, 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((ACPI_RESOURCE *)prsbuf.Pointer, 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.
|
|
*
|
|
* Populate our copy of _CRS and pass it back to _SRS to set the 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");
|
|
crsres->Data.Irq.Interrupts[0] = prsres->Data.Irq.Interrupts[0];
|
|
crsres->Data.Irq.NumberOfInterrupts = 1;
|
|
objectlist.Count = 1;
|
|
objectlist.Pointer = (ACPI_OBJECT *)crsres;
|
|
if (ACPI_FAILURE(status = AcpiEvaluateObject(lnkdev, "_SRS", &objectlist, NULL))) {
|
|
device_printf(sc->ap_dev, "couldn't route interrupt %d via %s - %s\n",
|
|
prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev), acpi_strerror(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);
|
|
}
|
|
|