FreeBSD-5.3/sys/dev/acpica/acpi_pcib_acpi.c
/*-
* Copyright (c) 2000 Michael Smith
* Copyright (c) 2000 BSDi
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: src/sys/dev/acpica/acpi_pcib_acpi.c,v 1.39.2.2 2004/10/14 23:52:21 imp Exp $
*/
#include "opt_acpi.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sysctl.h>
#include "acpi.h"
#include <dev/acpica/acpivar.h>
#include <machine/pci_cfgreg.h>
#include <dev/pci/pcivar.h>
#include <dev/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_flags;
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_acpi_resume(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 uint32_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, uint32_t data, int bytes);
static int acpi_pcib_acpi_route_interrupt(device_t pcib,
device_t dev, int pin);
static struct resource *acpi_pcib_acpi_alloc_resource(device_t dev,
device_t child, int type, int *rid,
u_long start, u_long end, u_long count,
u_int flags);
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, acpi_pcib_acpi_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, acpi_pcib_acpi_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);
MODULE_DEPEND(acpi_pcib, acpi, 1, 1, 1);
static int
acpi_pcib_acpi_probe(device_t dev)
{
static char *pcib_ids[] = { "PNP0A03", NULL };
if (acpi_disabled("pcib") ||
ACPI_ID_PROBE(device_get_parent(dev), dev, pcib_ids) == NULL)
return (ENXIO);
if (pci_cfgregopen() == 0)
return (ENXIO);
device_set_desc(dev, "ACPI Host-PCI bridge");
return (0);
}
static int
acpi_pcib_acpi_attach(device_t dev)
{
struct acpi_hpcib_softc *sc;
ACPI_STATUS status;
u_int addr, slot, func, busok;
uint8_t busno;
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 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?
* XXX It seems many BIOS's with multiple Host-PCI bridges do not set
* _BBN correctly. They set _BBN to zero for all bridges. Thus,
* if _BBN is zero and pcib0 already exists, we try to read our
* bus number from the configuration registers at address _ADR.
*/
status = acpi_GetInteger(sc->ap_handle, "_BBN", &sc->ap_bus);
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND) {
device_printf(dev, "could not evaluate _BBN - %s\n",
AcpiFormatException(status));
return_VALUE (ENXIO);
} else {
/* If it's not found, assume 0. */
sc->ap_bus = 0;
}
}
/*
* If the bus is zero and pcib0 already exists, read the bus number
* via PCI config space.
*/
busok = 1;
if (sc->ap_bus == 0 && devclass_get_device(pcib_devclass, 0) != dev) {
busok = 0;
status = acpi_GetInteger(sc->ap_handle, "_ADR", &addr);
if (ACPI_FAILURE(status)) {
if (status != AE_NOT_FOUND) {
device_printf(dev, "could not evaluate _ADR - %s\n",
AcpiFormatException(status));
return_VALUE (ENXIO);
} else
device_printf(dev, "couldn't find _ADR\n");
} else {
/* XXX: We assume bus 0. */
slot = addr >> 16;
func = addr & 0xffff;
if (bootverbose)
device_printf(dev, "reading config registers from 0:%d:%d\n",
slot, func);
if (host_pcib_get_busno(pci_cfgregread, 0, slot, func, &busno) == 0)
device_printf(dev, "couldn't read bus number from cfg space\n");
else {
sc->ap_bus = busno;
busok = 1;
}
}
}
/*
* If nothing else worked, hope that ACPI at least lays out the
* host-PCI bridges in order and that as a result our unit number
* is actually our bus number. There are several reasons this
* might not be true.
*/
if (busok == 0) {
sc->ap_bus = device_get_unit(dev);
device_printf(dev, "trying bus number %d\n", sc->ap_bus);
}
/*
* Get our segment number by evaluating _SEG
* It's OK for this to not exist.
*/
status = acpi_GetInteger(sc->ap_handle, "_SEG", &sc->ap_segment);
if (ACPI_FAILURE(status)) {
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));
}
static int
acpi_pcib_acpi_resume(device_t dev)
{
return (acpi_pcib_resume(dev));
}
/*
* 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);
case ACPI_IVAR_FLAGS:
*result = (uintptr_t)sc->ap_flags;
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);
case ACPI_IVAR_HANDLE:
sc->ap_handle = (ACPI_HANDLE)value;
return (0);
case ACPI_IVAR_FLAGS:
sc->ap_flags = (int)value;
return (0);
}
return (ENOENT);
}
static uint32_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,
uint32_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)
{
return (acpi_pcib_route_interrupt(pcib, dev, pin));
}
static int acpi_host_mem_start = 0x80000000;
TUNABLE_INT("hw.acpi.host_mem_start", &acpi_host_mem_start);
struct resource *
acpi_pcib_acpi_alloc_resource(device_t dev, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
/*
* If no memory preference is given, use upper 32MB slot most
* bioses use for their memory window. Typically other bridges
* before us get in the way to assert their preferences on memory.
* Hardcoding like this sucks, so a more MD/MI way needs to be
* found to do it. This is typically only used on older laptops
* that don't have pci busses behind pci bridge, so assuming > 32MB
* is liekly OK.
*/
if (type == SYS_RES_MEMORY && start == 0UL && end == ~0UL)
start = acpi_host_mem_start;
return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
count, flags));
}