/*-
* Copyright 1998 Massachusetts Institute of Technology
* Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>.
* Copyright 2006 by Marius Strobl <marius@FreeBSD.org>.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. 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/i386/i386/nexus.c,v 1.43 2001/02/09
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/rman.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/openfirm.h>
#include <dev/fdt/simplebus.h>
#include <machine/bus.h>
#include <machine/resource.h>
/*
* The ofwbus (which is a pseudo-bus actually) iterates over the nodes that
* hang from the Open Firmware root node and adds them as devices to this bus
* (except some special nodes which are excluded) so that drivers can be
* attached to them. There should be only one ofwbus in the system, added
* directly as a child of nexus0.
*/
static device_probe_t ofwbus_probe;
static device_attach_t ofwbus_attach;
static bus_alloc_resource_t ofwbus_alloc_resource;
static bus_release_resource_t ofwbus_release_resource;
static device_method_t ofwbus_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ofwbus_probe),
DEVMETHOD(device_attach, ofwbus_attach),
/* Bus interface */
DEVMETHOD(bus_alloc_resource, ofwbus_alloc_resource),
DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
DEVMETHOD(bus_release_resource, ofwbus_release_resource),
DEVMETHOD_END
};
DEFINE_CLASS_1(ofwbus, ofwbus_driver, ofwbus_methods,
sizeof(struct simplebus_softc), simplebus_driver);
EARLY_DRIVER_MODULE(ofwbus, nexus, ofwbus_driver, 0, 0,
BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
MODULE_VERSION(ofwbus, 1);
static int
ofwbus_probe(device_t dev)
{
if (OF_peer(0) == 0)
return (ENXIO);
/* Only one instance of ofwbus. */
if (device_get_unit(dev) != 0)
panic("ofwbus added with non-zero unit number: %d\n",
device_get_unit(dev));
device_set_desc(dev, "Open Firmware Device Tree");
return (BUS_PROBE_NOWILDCARD);
}
static int
ofwbus_attach(device_t dev)
{
phandle_t node;
node = OF_peer(0);
/*
* If no Open Firmware, bail early
*/
if (node == -1)
return (ENXIO);
/*
* ofwbus bus starts on unamed node in FDT, so we cannot make
* ofw_bus_devinfo from it. Pass node to simplebus_init directly.
*/
simplebus_init(dev, node);
/*
* Allow devices to identify.
*/
bus_generic_probe(dev);
/*
* Now walk the OFW tree and attach top-level devices.
*/
for (node = OF_child(node); node > 0; node = OF_peer(node))
simplebus_add_device(dev, node, 0, NULL, -1, NULL);
return (bus_generic_attach(dev));
}
static struct resource *
ofwbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
struct resource *rv;
struct resource_list_entry *rle;
bool isdefault, passthrough;
isdefault = RMAN_IS_DEFAULT_RANGE(start, end);
passthrough = (device_get_parent(child) != bus);
rle = NULL;
if (!passthrough && isdefault) {
rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child),
type, *rid);
if (rle == NULL) {
if (bootverbose)
device_printf(bus, "no default resources for "
"rid = %d, type = %d\n", *rid, type);
return (NULL);
}
start = rle->start;
count = ummax(count, rle->count);
end = ummax(rle->end, start + count - 1);
}
/* Let nexus handle the allocation. */
rv = bus_generic_alloc_resource(bus, child, type, rid, start, end,
count, flags);
if (rv == NULL)
return (NULL);
if (!passthrough && rle != NULL) {
rle->res = rv;
rle->start = rman_get_start(rv);
rle->end = rman_get_end(rv);
rle->count = rle->end - rle->start + 1;
}
return (rv);
}
static int
ofwbus_release_resource(device_t bus, device_t child, int type,
int rid, struct resource *r)
{
struct resource_list_entry *rle;
bool passthrough;
passthrough = (device_get_parent(child) != bus);
if (!passthrough) {
/* Clean resource list entry */
rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child),
type, rid);
if (rle != NULL)
rle->res = NULL;
}
/* Let nexus handle the release. */
return (bus_generic_release_resource(bus, child, type, rid, r));
}
