f16527bb44
in the case where there are no interrupts routed for it does not contain enough space to use it to route an interrupt. In the case where we need to route an interrupt, throw away the returned buffer and create a new one containing the interrupt we want.
514 lines
17 KiB
C
514 lines
17 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, resbuf;
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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(&crsbuf, 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(&prsbuf, 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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* Build a resource buffer and pass it to AcpiSetCurrentResources to route the
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|
* new 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");
|
|
|
|
if (crsbuf.Pointer != NULL) /* should never happen */
|
|
AcpiOsFree(crsbuf.Pointer);
|
|
crsbuf.Pointer = NULL;
|
|
resbuf.Id = ACPI_RSTYPE_IRQ;
|
|
resbuf.Length = 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(sc->ap_dev, "couldn't route interrupt %d via %s, interupt resource build failed - %s\n",
|
|
prsres->Data.Irq.Interrupts[0], acpi_name(lnkdev), AcpiFormatException(status));
|
|
goto out;
|
|
}
|
|
if (ACPI_FAILURE(status = AcpiSetCurrentResources(lnkdev, &resbuf))) {
|
|
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);
|
|
}
|
|
|