501 lines
16 KiB
C
501 lines
16 KiB
C
/*-
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* Copyright (c) 2000 Michael Smith
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* Copyright (c) 2000 BSDi
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "opt_acpi.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include "acpi.h"
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#include <dev/acpica/acpivar.h>
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#include <machine/pci_cfgreg.h>
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#include <pci/pcivar.h>
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#include "pcib_if.h"
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/*
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* Hooks for the ACPI CA debugging infrastructure
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*/
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#define _COMPONENT ACPI_BUS
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MODULE_NAME("PCI")
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struct acpi_pcib_softc {
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device_t ap_dev;
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ACPI_HANDLE ap_handle;
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int ap_segment; /* analagous to Alpha 'hose' */
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int ap_bus; /* bios-assigned bus number */
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ACPI_BUFFER ap_prt; /* interrupt routing table */
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};
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static int acpi_pcib_probe(device_t bus);
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static int acpi_pcib_attach(device_t bus);
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static int acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result);
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static int acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value);
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static int acpi_pcib_maxslots(device_t dev);
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static u_int32_t acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes);
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static void acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg,
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u_int32_t data, int bytes);
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static int acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin);
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static device_method_t acpi_pcib_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, acpi_pcib_probe),
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DEVMETHOD(device_attach, acpi_pcib_attach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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/* Bus interface */
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DEVMETHOD(bus_print_child, bus_generic_print_child),
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DEVMETHOD(bus_read_ivar, acpi_pcib_read_ivar),
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DEVMETHOD(bus_write_ivar, acpi_pcib_write_ivar),
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DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
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DEVMETHOD(bus_release_resource, bus_generic_release_resource),
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DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
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DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
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DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
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DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
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/* pcib interface */
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DEVMETHOD(pcib_maxslots, acpi_pcib_maxslots),
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DEVMETHOD(pcib_read_config, acpi_pcib_read_config),
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DEVMETHOD(pcib_write_config, acpi_pcib_write_config),
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DEVMETHOD(pcib_route_interrupt, acpi_pcib_route_interrupt),
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{0, 0}
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};
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static driver_t acpi_pcib_driver = {
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"acpi_pcib",
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acpi_pcib_methods,
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sizeof(struct acpi_pcib_softc),
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};
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devclass_t acpi_pcib_devclass;
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DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_driver, acpi_pcib_devclass, 0, 0);
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static int
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acpi_pcib_probe(device_t dev)
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{
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if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) &&
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!acpi_disabled("pci") &&
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acpi_MatchHid(dev, "PNP0A03")) {
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/*
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* Set device description
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*/
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device_set_desc(dev, "Host-PCI bridge");
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return(0);
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}
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return(ENXIO);
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}
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static int
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acpi_pcib_attach(device_t dev)
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{
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struct acpi_pcib_softc *sc;
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device_t child;
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ACPI_STATUS status;
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int result;
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FUNCTION_TRACE(__func__);
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sc = device_get_softc(dev);
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sc->ap_dev = dev;
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sc->ap_handle = acpi_get_handle(dev);
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/*
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* Don't attach if we're not really there.
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*
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* XXX this isn't entirely correct, since we may be a PCI bus
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* on a hot-plug docking station, etc.
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*/
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if (!acpi_DeviceIsPresent(dev))
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return_VALUE(ENXIO);
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/*
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* Get our segment number by evaluating _SEG
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* It's OK for this to not exist.
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*/
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if ((status = acpi_EvaluateInteger(sc->ap_handle, "_SEG", &sc->ap_segment)) != AE_OK) {
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if (status != AE_NOT_FOUND) {
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device_printf(dev, "could not evaluate _SEG - %s\n", AcpiFormatException(status));
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return_VALUE(ENXIO);
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}
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/* if it's not found, assume 0 */
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sc->ap_segment = 0;
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}
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/*
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* Get our base bus number by evaluating _BBN
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* If this doesn't exist, we assume we're bus number 0.
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*
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* XXX note that it may also not exist in the case where we are
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* meant to use a private configuration space mechanism for this bus,
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* so we should dig out our resources and check to see if we have
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* anything like that. How do we do this?
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* XXX If we have the requisite information, and if we don't think the
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* default PCI configuration space handlers can deal with this bus,
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* we should attach our own handler.
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* XXX invoke _REG on this for the PCI config space address space?
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*/
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if ((status = acpi_EvaluateInteger(sc->ap_handle, "_BBN", &sc->ap_bus)) != AE_OK) {
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if (status != AE_NOT_FOUND) {
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device_printf(dev, "could not evaluate _BBN - %s\n", AcpiFormatException(status));
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return_VALUE(ENXIO);
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}
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/* if it's not found, assume 0 */
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sc->ap_bus = 0;
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}
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/*
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* Make sure that this bus hasn't already been found. If it has, return silently
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* (should we complain here?).
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*/
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if (devclass_get_device(devclass_find("pci"), sc->ap_bus) != NULL)
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return_VALUE(0);
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/*
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* Get the PCI interrupt routing table.
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*/
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if ((status = acpi_GetIntoBuffer(sc->ap_handle, AcpiGetIrqRoutingTable, &sc->ap_prt)) != AE_OK) {
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device_printf(dev, "could not get PCI interrupt routing table - %s\n", AcpiFormatException(status));
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/* this is not an error, but it may reduce functionality */
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}
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/*
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* Attach the PCI bus proper.
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*/
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if ((child = device_add_child(dev, "pci", sc->ap_bus)) == NULL) {
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device_printf(device_get_parent(dev), "couldn't attach pci bus");
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return_VALUE(ENXIO);
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}
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/*
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* Now go scan the bus.
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*
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* XXX It would be nice to defer this and count on the nexus getting it
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* after the first pass, but this does not seem to be reliable.
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*/
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result = bus_generic_attach(dev);
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/*
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* XXX cross-reference our children to attached devices on the child bus
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* via _ADR, so we can provide power management.
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*/
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/* XXX implement */
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return_VALUE(result);
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}
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/*
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* ACPI doesn't tell us how many slots there are, so use the standard
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* maximum.
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*/
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static int
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acpi_pcib_maxslots(device_t dev)
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{
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return(PCI_SLOTMAX);
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}
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/*
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* Support for standard PCI bridge ivars.
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*/
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static int
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acpi_pcib_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
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{
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struct acpi_pcib_softc *sc = device_get_softc(dev);
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switch (which) {
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case PCIB_IVAR_BUS:
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*result = sc->ap_bus;
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return(0);
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}
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return(ENOENT);
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}
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static int
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acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
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{
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struct acpi_pcib_softc *sc = device_get_softc(dev);
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switch (which) {
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case PCIB_IVAR_BUS:
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sc->ap_bus = value;
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return(0);
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}
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return(ENOENT);
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}
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static u_int32_t
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acpi_pcib_read_config(device_t dev, int bus, int slot, int func, int reg, int bytes)
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{
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return(pci_cfgregread(bus, slot, func, reg, bytes));
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}
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static void
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acpi_pcib_write_config(device_t dev, int bus, int slot, int func, int reg, u_int32_t data, int bytes)
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{
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pci_cfgregwrite(bus, slot, func, reg, data, bytes);
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}
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/*
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* Route an interrupt for a child of the bridge.
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*
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* XXX clean up error messages
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*
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* XXX this function is somewhat bulky
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*/
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static int
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acpi_pcib_route_interrupt(device_t pcib, device_t dev, int pin)
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{
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struct acpi_pcib_softc *sc;
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PCI_ROUTING_TABLE *prt;
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ACPI_HANDLE lnkdev;
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ACPI_BUFFER crsbuf, prsbuf;
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ACPI_RESOURCE *crsres, *prsres;
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ACPI_DEVICE_INFO devinfo;
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ACPI_STATUS status;
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u_int8_t *prtp;
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device_t *devlist;
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int devcount;
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int bus;
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int interrupt;
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int i;
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crsbuf.Pointer = NULL;
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prsbuf.Pointer = NULL;
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devlist = NULL;
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interrupt = 255;
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/* ACPI numbers pins 0-3, not 1-4 like the BIOS */
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pin--;
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/* find the bridge softc */
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if (devclass_get_devices(acpi_pcib_devclass, &devlist, &devcount))
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goto out;
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BUS_READ_IVAR(pcib, pcib, PCIB_IVAR_BUS, (uintptr_t *)&bus);
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sc = NULL;
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for (i = 0; i < devcount; i++) {
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sc = device_get_softc(*(devlist + i));
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if (sc->ap_bus == bus)
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break;
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sc = NULL;
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}
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if (sc == NULL) /* not one of ours */
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goto out;
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prtp = sc->ap_prt.Pointer;
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if (prtp == NULL) /* didn't get routing table */
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goto out;
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/* scan the table looking for this device */
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for (;;) {
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prt = (PCI_ROUTING_TABLE *)prtp;
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if (prt->Length == 0) /* end of table */
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goto out;
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/*
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* Compare the slot number (high word of Address) and pin number
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* (note that ACPI uses 0 for INTA) to check for a match.
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*
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* Note that the low word of the Address field (function number)
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* is required by the specification to be 0xffff. We don't risk
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* checking it here.
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*/
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if ((((prt->Address & 0xffff0000) >> 16) == pci_get_slot(dev)) &&
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(prt->Pin == pin)) {
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device_printf(sc->ap_dev, "matched entry for %d.%d.INT%c (source %s)\n",
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pci_get_bus(dev), pci_get_slot(dev), 'A' + pin, prt->Source);
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break;
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}
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/* skip to next entry */
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prtp += prt->Length;
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}
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/*
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* If source is empty/NULL, the source index is the global IRQ number.
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*/
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if ((prt->Source == NULL) || (prt->Source[0] == '\0')) {
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device_printf(sc->ap_dev, "device is hardwired to IRQ %d\n", prt->SourceIndex);
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interrupt = prt->SourceIndex;
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goto out;
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}
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/*
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* We have to find the source device (PCI interrupt link device)
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*/
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if (ACPI_FAILURE(AcpiGetHandle(ACPI_ROOT_OBJECT, prt->Source, &lnkdev))) {
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device_printf(sc->ap_dev, "couldn't find PCI interrupt link device %s\n", prt->Source);
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goto out;
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}
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/*
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* Verify that this is a PCI link device, and that it's present.
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*/
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if (ACPI_FAILURE(AcpiGetObjectInfo(lnkdev, &devinfo))) {
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device_printf(sc->ap_dev, "couldn't validate PCI interrupt link device %s\n", prt->Source);
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goto out;
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}
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if (!(devinfo.Valid & ACPI_VALID_HID) || strcmp("PNP0C0F", devinfo.HardwareId)) {
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device_printf(sc->ap_dev, "PCI interrupt link device %s has wrong _HID (%s)\n",
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prt->Source, devinfo.HardwareId);
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goto out;
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}
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/* should be 'present' and 'functioning' */
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if ((devinfo.CurrentStatus & 0x09) != 0x09) {
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device_printf(sc->ap_dev, "PCI interrupt link device %s unavailable (CurrentStatus 0x%x)\n",
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prt->Source, devinfo.CurrentStatus);
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goto out;
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}
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/*
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* Get the current and possible resources for the interrupt link device.
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*/
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if (ACPI_FAILURE(status = acpi_GetIntoBuffer(lnkdev, AcpiGetCurrentResources, &crsbuf))) {
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device_printf(sc->ap_dev, "couldn't get PCI interrupt link device _CRS data - %s\n",
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AcpiFormatException(status));
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goto out; /* this is fatal */
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}
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if ((status = acpi_GetIntoBuffer(lnkdev, AcpiGetPossibleResources, &prsbuf)) != AE_OK) {
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device_printf(sc->ap_dev, "couldn't get PCI interrupt link device _PRS data - %s\n",
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AcpiFormatException(status));
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/* this is not fatal, since it may be hardwired */
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}
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DEBUG_PRINT(TRACE_RESOURCES, ("got %d bytes for %s._CRS\n", crsbuf.Length, acpi_name(lnkdev)));
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DEBUG_PRINT(TRACE_RESOURCES, ("got %d bytes for %s._PRS\n", prsbuf.Length, acpi_name(lnkdev)));
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/*
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* The interrupt may already be routed, so check _CRS first. We don't check the
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* 'decoding' bit in the _STA result, since there's nothing in the spec that
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* mandates it be set, however some BIOS' will set it if the decode is active.
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*
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* The Source Index points to the particular resource entry we're interested in.
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*/
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if (ACPI_FAILURE(acpi_FindIndexedResource((ACPI_RESOURCE *)crsbuf.Pointer, prt->SourceIndex, &crsres))) {
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device_printf(sc->ap_dev, "_CRS buffer corrupt, cannot route interrupt\n");
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goto out;
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}
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/* type-check the resource we've got */
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if (crsres->Id != ACPI_RSTYPE_IRQ) { /* XXX ACPI_RSTYPE_EXT_IRQ */
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device_printf(sc->ap_dev, "_CRS resource entry has unsupported type %d\n", crsres->Id);
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goto out;
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}
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/* if there's more than one interrupt, we are confused */
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if (crsres->Data.Irq.NumberOfInterrupts > 1) {
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device_printf(sc->ap_dev, "device has too many interrupts (%d)\n", crsres->Data.Irq.NumberOfInterrupts);
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goto out;
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}
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/*
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* If there's only one interrupt, and it's not zero, then we're already routed.
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*
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* Note that we could also check the 'decoding' bit in _STA, but can't depend on
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* it since it's not part of the spec.
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*
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* XXX check ASL examples to see if this is an acceptable set of tests
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*/
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if ((crsres->Data.Irq.NumberOfInterrupts == 1) && (crsres->Data.Irq.Interrupts[0] != 0)) {
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device_printf(sc->ap_dev, "device is routed to IRQ %d\n", crsres->Data.Irq.Interrupts[0]);
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interrupt = crsres->Data.Irq.Interrupts[0];
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goto out;
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}
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/*
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* There isn't an interrupt, so we have to look at _PRS to get one.
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* Get the set of allowed interrupts from the _PRS resource indexed by SourceIndex.
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*/
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if (prsbuf.Pointer == NULL) {
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device_printf(sc->ap_dev, "device has no routed interrupt and no _PRS on PCI interrupt link device\n");
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goto out;
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}
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if (ACPI_FAILURE(acpi_FindIndexedResource((ACPI_RESOURCE *)prsbuf.Pointer, prt->SourceIndex, &prsres))) {
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device_printf(sc->ap_dev, "_PRS buffer corrupt, cannot route interrupt\n");
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goto out;
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}
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/* type-check the resource we've got */
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if (prsres->Id != ACPI_RSTYPE_IRQ) { /* XXX ACPI_RSTYPE_EXT_IRQ */
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device_printf(sc->ap_dev, "_PRS resource entry has unsupported type %d\n", prsres->Id);
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goto out;
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}
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/* there has to be at least one interrupt available */
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if (prsres->Data.Irq.NumberOfInterrupts < 1) {
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device_printf(sc->ap_dev, "device has no interrupts\n");
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goto out;
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}
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/*
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* Pick an interrupt to use. Note that a more scientific approach than just
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* taking the first one available would be desirable.
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*
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* The PCI BIOS $PIR table offers "preferred PCI interrupts", but ACPI doesn't
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* seem to offer a similar mechanism, so picking a "good" interrupt here is a
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* difficult task.
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*
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* Populate our copy of _CRS and pass it back to _SRS to set the interrupt.
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*/
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device_printf(sc->ap_dev, "possible interrupts:");
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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), AcpiFormatException(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);
|
|
}
|
|
|