Function apb_alloc_resource

freebsd/mips/atheros/apb.c:164–244

}

static struct resource *
apb_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 apb_softc		*sc = device_get_softc(bus);
	struct apb_ivar			*ivar = device_get_ivars(child);
	struct resource			*rv;
	struct resource_list_entry	*rle;
	struct rman			*rm;
	int				 isdefault, needactivate, passthrough;

	isdefault = (RMAN_IS_DEFAULT_RANGE(start, end));
	needactivate = flags & RF_ACTIVE;
	/*
	 * Pass memory requests to nexus device
	 */
	passthrough = (device_get_parent(child) != bus);
	rle = NULL;

	dprintf("%s: entry (%p, %p, %d, %d, %p, %p, %jd, %d)\n",
	    __func__, bus, child, type, *rid, (void *)(intptr_t)start,
	    (void *)(intptr_t)end, count, flags);

	if (passthrough)
		return (BUS_ALLOC_RESOURCE(device_get_parent(bus), child, type,
		    rid, start, end, count, flags));

	/*
	 * If this is an allocation of the "default" range for a given RID,
	 * and we know what the resources for this device are (ie. they aren't
	 * maintained by a child bus), then work out the start/end values.
	 */

	if (isdefault) {
		rle = resource_list_find(&ivar->resources, type, *rid);
		if (rle == NULL) {
			return (NULL);
		}

		if (rle->res != NULL) {
			panic("%s: resource entry is busy", __func__);
		}
		start = rle->start;
		end = rle->end;
		count = rle->count;

		dprintf("%s: default resource (%p, %p, %ld)\n",
		    __func__, (void *)(intptr_t)start,
		    (void *)(intptr_t)end, count);
	}

	switch (type) {
	case SYS_RES_IRQ:
		rm = &sc->apb_irq_rman;
		break;
	case SYS_RES_MEMORY:
		rm = &sc->apb_mem_rman;
		break;