freebsd-skq/sys/sparc64/pci/apb.c
marius d60b8a3096 Make the PCI code aware of PCI domains (aka PCI segments) so we can
support machines having multiple independently numbered PCI domains
and don't support reenumeration without ambiguity amongst the
devices as seen by the OS and represented by PCI location strings.
This includes introducing a function pci_find_dbsf(9) which works
like pci_find_bsf(9) but additionally takes a domain number argument
and limiting pci_find_bsf(9) to only search devices in domain 0 (the
only domain in single-domain systems). Bge(4) and ofw_pcibus(4) are
changed to use pci_find_dbsf(9) instead of pci_find_bsf(9) in order
to no longer report false positives when searching for siblings and
dupe devices in the same domain respectively.
Along with this change the sole host-PCI bridge driver converted to
actually make use of PCI domain support is uninorth(4), the others
continue to use domain 0 only for now and need to be converted as
appropriate later on.
Note that this means that the format of the location strings as used
by pciconf(8) has been changed and that consumers of <sys/pciio.h>
potentially need to be recompiled.

Suggested by:	jhb
Reviewed by:	grehan, jhb, marcel
Approved by:	re (kensmith), jhb (PCI maintainer hat)
2007-09-30 11:05:18 +00:00

275 lines
7.8 KiB
C

/*-
* Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
* Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
* Copyright (c) 2000 BSDi
* Copyright (c) 2001, 2003 Thomas Moestl <tmm@FreeBSD.org>
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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.
*
* from: FreeBSD: src/sys/dev/pci/pci_pci.c,v 1.3 2000/12/13
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Support for the Sun APB (Advanced PCI Bridge) PCI-PCI bridge.
* This bridge does not fully comply to the PCI bridge specification, and is
* therefore not supported by the generic driver.
* We can use some of the pcib methods anyway.
*/
#include "opt_ofw_pci.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/openfirm.h>
#include <machine/bus.h>
#include <machine/ofw_bus.h>
#include <machine/resource.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcib_private.h>
#include "pcib_if.h"
#include <sparc64/pci/ofw_pci.h>
#include <sparc64/pci/ofw_pcib_subr.h>
/*
* Bridge-specific data.
*/
struct apb_softc {
struct ofw_pcib_gen_softc sc_bsc;
uint8_t sc_iomap;
uint8_t sc_memmap;
};
static device_probe_t apb_probe;
static device_attach_t apb_attach;
static bus_alloc_resource_t apb_alloc_resource;
static device_method_t apb_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, apb_probe),
DEVMETHOD(device_attach, apb_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, pcib_read_ivar),
DEVMETHOD(bus_write_ivar, pcib_write_ivar),
DEVMETHOD(bus_alloc_resource, apb_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, pcib_read_config),
DEVMETHOD(pcib_write_config, pcib_write_config),
DEVMETHOD(pcib_route_interrupt, ofw_pcib_gen_route_interrupt),
/* ofw_bus interface */
DEVMETHOD(ofw_bus_get_node, ofw_pcib_gen_get_node),
/* ofw_pci interface */
DEVMETHOD(ofw_pci_adjust_busrange, ofw_pcib_gen_adjust_busrange),
{ 0, 0 }
};
static devclass_t pcib_devclass;
DEFINE_CLASS_0(pcib, apb_driver, apb_methods, sizeof(struct apb_softc));
DRIVER_MODULE(apb, pci, apb_driver, pcib_devclass, 0, 0);
/* APB specific registers */
#define APBR_IOMAP 0xde
#define APBR_MEMMAP 0xdf
/* Definitions for the mapping registers */
#define APB_IO_SCALE 0x200000
#define APB_MEM_SCALE 0x20000000
/*
* Generic device interface
*/
static int
apb_probe(device_t dev)
{
if (pci_get_vendor(dev) == 0x108e && /* Sun */
pci_get_device(dev) == 0x5000) { /* APB */
device_set_desc(dev, "APB PCI-PCI bridge");
return (0);
}
return (ENXIO);
}
static void
apb_map_print(uint8_t map, u_long scale)
{
int i, first;
for (first = 1, i = 0; i < 8; i++) {
if ((map & (1 << i)) != 0) {
printf("%s0x%lx-0x%lx", first ? "" : ", ",
i * scale, (i + 1) * scale - 1);
first = 0;
}
}
}
static int
apb_checkrange(uint8_t map, u_long scale, u_long start, u_long end)
{
int i, ei;
i = start / scale;
ei = end / scale;
if (i > 7 || ei > 7)
return (0);
for (; i <= ei; i++)
if ((map & (1 << i)) == 0)
return (0);
return (1);
}
static int
apb_attach(device_t dev)
{
struct apb_softc *sc;
sc = device_get_softc(dev);
/*
* Get current bridge configuration.
*/
sc->sc_iomap = pci_read_config(dev, APBR_IOMAP, 1);
sc->sc_memmap = pci_read_config(dev, APBR_MEMMAP, 1);
ofw_pcib_gen_setup(dev);
if (bootverbose) {
device_printf(dev, " domain %d\n",
sc->sc_bsc.ops_pcib_sc.domain);
device_printf(dev, " secondary bus %d\n",
sc->sc_bsc.ops_pcib_sc.secbus);
device_printf(dev, " subordinate bus %d\n",
sc->sc_bsc.ops_pcib_sc.subbus);
device_printf(dev, " I/O decode ");
apb_map_print(sc->sc_iomap, APB_IO_SCALE);
printf("\n");
device_printf(dev, " memory decode ");
apb_map_print(sc->sc_memmap, APB_MEM_SCALE);
printf("\n");
}
device_add_child(dev, "pci", sc->sc_bsc.ops_pcib_sc.secbus);
return (bus_generic_attach(dev));
}
/*
* We have to trap resource allocation requests and ensure that the bridge
* is set up to, or capable of handling them.
*/
static struct resource *
apb_alloc_resource(device_t dev, device_t child, int type, int *rid,
u_long start, u_long end, u_long count, u_int flags)
{
struct apb_softc *sc;
sc = device_get_softc(dev);
/*
* If this is a "default" allocation against this rid, we can't work
* out where it's coming from (we should actually never see these) so
* we just have to punt.
*/
if (start == 0 && end == ~0) {
device_printf(dev, "can't decode default resource id %d for "
"%s%d, bypassing\n", *rid, device_get_name(child),
device_get_unit(child));
goto passup;
}
/*
* Fail the allocation for this range if it's not supported.
* XXX we should probably just fix up the bridge decode and
* soldier on.
*/
switch (type) {
case SYS_RES_IOPORT:
if (!apb_checkrange(sc->sc_iomap, APB_IO_SCALE, start, end)) {
device_printf(dev, "device %s%d requested unsupported "
"I/O range 0x%lx-0x%lx\n", device_get_name(child),
device_get_unit(child), start, end);
return (NULL);
}
if (bootverbose)
device_printf(sc->sc_bsc.ops_pcib_sc.dev, "device "
"%s%d requested decoded I/O range 0x%lx-0x%lx\n",
device_get_name(child), device_get_unit(child),
start, end);
break;
case SYS_RES_MEMORY:
if (!apb_checkrange(sc->sc_memmap, APB_MEM_SCALE, start, end)) {
device_printf(dev, "device %s%d requested unsupported "
"memory range 0x%lx-0x%lx\n",
device_get_name(child), device_get_unit(child),
start, end);
return (NULL);
}
if (bootverbose)
device_printf(sc->sc_bsc.ops_pcib_sc.dev, "device "
"%s%d requested decoded memory range 0x%lx-0x%lx\n",
device_get_name(child), device_get_unit(child),
start, end);
break;
default:
break;
}
passup:
/*
* Bridge is OK decoding this resource, so pass it up.
*/
return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
count, flags));
}