/*- * Copyright 1998 Massachusetts Institute of Technology * Copyright 2001 by Thomas Moestl . * Copyright 2006 by Marius Strobl . * 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 #include #include #include #include #include #include #include #include #include #include #include /* * 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)); }