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freebsd-skq/sys/dev/acpica/acpi_pcib_acpi.c
jhb 36ed1029fc Overhaul the ACPI PCI bridge driver a bit: 
- Add an ACPI PCI-PCI bridge driver (the previous driver just handled
  Host-PCI bridges) that is a PCI driver that is a subclass of the generic
  PCI-PCI bridge driver.  It overrides probe, attach, read_ivar, and
  pci_route_interrupt.
  - The probe routine only succeeds if our parent is an ACPI PCI bus which
    we test for by seeing if we can read our ACPI_HANDLE as an ivar.
  - The attach routine saves a copy of our handle and calls the new
    acpi_pcib_attach_common() function described below.
  - The read_ivar routine handles normal PCI-PCI bridge ivars and adds an
    ivar to return the ACPI_HANDLE of the bus this bridge represents.
  - The route_interrupt routine fetches the _PRT (PCI Interrupt Routing
    Table) from the bridge device's softc and passes it off to
    acpi_pcib_route_interrupt() to route the interrupt.
- Split the old ACPI Host-PCI bridge driver into two pieces.  Part of
  the attach routine and most of the route_interrupt routine remain in
  acpi_pcib.c and are shared by both ACPI PCI bridge drivers.
  - The attach routine verifies the PCI bridge is present, reads in
    the _PRT for the bridge, and attaches the child PCI bus.
  - The route_interrupt routine uses the passed in _PRT to route a PCI
    interrupt.
  The rest of the driver is the ACPI Host-PCI bridge specific bits that
  live in acpi_pcib_acpi.c.
  - We no longer duplicate pcib_maxslots but use it directly.
  - The driver now uses the pcib devclass instead of its own devclass.
    This means that PCI busses are now only children of pcib devices.
  - Allow the ACPI_HANDLE for the child PCI bus to be read as an ivar
    of the child bus.
  - Fetch the _PRT for routing PCI interrupts directly from our softc
    instead of walking the devclass to find ourself and then fetch our
    own softc.

With this change and the new ACPI PCI bus driver, ACPI can now properly
route interrupts for devices behind PCI-PCI bridges.  That is, the
Itanium2 with like 10 PCI busses can now boot ok and route all the PCI
interrupts.  Hopefully this will also fix problems people are having with
CardBus bridges behind PCI-PCI bridges not properly routing interrupts
when ACPI is used.

Tested on:	i386, ia64
2002-08-26 18:30:27 +00:00

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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 <pci/pcib_private.h>
#include "pcib_if.h"
#include <dev/acpica/acpi_pcibvar.h>
/*
* Hooks for the ACPI CA debugging infrastructure
*/
#define _COMPONENT ACPI_BUS
ACPI_MODULE_NAME("PCI_ACPI")
struct acpi_hpcib_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_acpi_probe(device_t bus);
static int acpi_pcib_acpi_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 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_acpi_route_interrupt(device_t pcib,
device_t dev, int pin);
static device_method_t acpi_pcib_acpi_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, acpi_pcib_acpi_probe),
DEVMETHOD(device_attach, acpi_pcib_acpi_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, pcib_maxslots),
DEVMETHOD(pcib_read_config, acpi_pcib_read_config),
DEVMETHOD(pcib_write_config, acpi_pcib_write_config),
DEVMETHOD(pcib_route_interrupt, acpi_pcib_acpi_route_interrupt),
{0, 0}
};
static driver_t acpi_pcib_acpi_driver = {
"pcib",
acpi_pcib_acpi_methods,
sizeof(struct acpi_hpcib_softc),
};
DRIVER_MODULE(acpi_pcib, acpi, acpi_pcib_acpi_driver, pcib_devclass, 0, 0);
static int
acpi_pcib_acpi_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, "ACPI Host-PCI bridge");
return(0);
}
return(ENXIO);
}
static int
acpi_pcib_acpi_attach(device_t dev)
{
struct acpi_hpcib_softc *sc;
ACPI_STATUS status;
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
sc = device_get_softc(dev);
sc->ap_dev = dev;
sc->ap_handle = acpi_get_handle(dev);
/*
* Get our base bus number by evaluating _BBN. If that doesn't work, try _ADR.
* If this doesn't work, 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 (ACPI_FAILURE(status = acpi_EvaluateInteger(sc->ap_handle, "_BBN", &sc->ap_bus))) {
if (status != AE_NOT_FOUND) {
device_printf(dev, "could not evaluate _BBN - %s\n", AcpiFormatException(status));
return_VALUE(ENXIO);
}
if (ACPI_FAILURE(status = acpi_EvaluateInteger(sc->ap_handle, "_ADR", &sc->ap_bus))) {
if (status != AE_NOT_FOUND) {
device_printf(dev, "could not evaluate _ADR - %s\n", AcpiFormatException(status));
return_VALUE(ENXIO);
}
} else {
/* if it's not found, assume 0 */
sc->ap_bus = 0;
}
}
/*
* Get our segment number by evaluating _SEG
* It's OK for this to not exist.
*/
if (ACPI_FAILURE(status = acpi_EvaluateInteger(sc->ap_handle, "_SEG", &sc->ap_segment))) {
if (status != AE_NOT_FOUND) {
device_printf(dev, "could not evaluate _SEG - %s\n", AcpiFormatException(status));
return_VALUE(ENXIO);
}
/* if it's not found, assume 0 */
sc->ap_segment = 0;
}
return (acpi_pcib_attach(dev, &sc->ap_prt, sc->ap_bus));
}
/*
* 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_hpcib_softc *sc = device_get_softc(dev);
switch (which) {
case PCIB_IVAR_BUS:
*result = sc->ap_bus;
return(0);
case ACPI_IVAR_HANDLE:
*result = (uintptr_t)sc->ap_handle;
return(0);
}
return(ENOENT);
}
static int
acpi_pcib_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
{
struct acpi_hpcib_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);
}
static int
acpi_pcib_acpi_route_interrupt(device_t pcib, device_t dev, int pin)
{
struct acpi_hpcib_softc *sc;
/* find the bridge softc */
sc = device_get_softc(pcib);
return (acpi_pcib_route_interrupt(pcib, dev, pin, &sc->ap_prt));
}
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