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freebsd/sys/dev/acpica/acpi_pcib_acpi.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 <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_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;
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), 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);
}
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