ofwbus.c

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    1 /*-
    2  * Copyright 1998 Massachusetts Institute of Technology
    3  * Copyright 2001 by Thomas Moestl <tmm@FreeBSD.org>.
    4  * Copyright 2006 by Marius Strobl <marius@FreeBSD.org>.
    5  * All rights reserved.
    6  *
    7  * Permission to use, copy, modify, and distribute this software and
    8  * its documentation for any purpose and without fee is hereby
    9  * granted, provided that both the above copyright notice and this
   10  * permission notice appear in all copies, that both the above
   11  * copyright notice and this permission notice appear in all
   12  * supporting documentation, and that the name of M.I.T. not be used
   13  * in advertising or publicity pertaining to distribution of the
   14  * software without specific, written prior permission.  M.I.T. makes
   15  * no representations about the suitability of this software for any
   16  * purpose.  It is provided "as is" without express or implied
   17  * warranty.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   20  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   21  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   22  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   23  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   26  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   27  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: FreeBSD: src/sys/i386/i386/nexus.c,v 1.43 2001/02/09
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/bus.h>
   41 #include <sys/kernel.h>
   42 #include <sys/malloc.h>
   43 #include <sys/module.h>
   44 #include <sys/pcpu.h>
   45 #include <sys/rman.h>
   46 #ifdef INTRNG
   47 #include <sys/intr.h>
   48 #endif
   49 
   50 #include <vm/vm.h>
   51 #include <vm/pmap.h>
   52 
   53 #include <dev/ofw/ofw_bus.h>
   54 #include <dev/ofw/ofw_bus_subr.h>
   55 #include <dev/ofw/openfirm.h>
   56 #include <dev/fdt/simplebus.h>
   57 
   58 #include <machine/bus.h>
   59 #include <machine/resource.h>
   60 
   61 /*
   62  * The ofwbus (which is a pseudo-bus actually) iterates over the nodes that
   63  * hang from the Open Firmware root node and adds them as devices to this bus
   64  * (except some special nodes which are excluded) so that drivers can be
   65  * attached to them.
   66  *
   67  */
   68 
   69 struct ofwbus_softc {
   70         struct simplebus_softc simplebus_sc;
   71         struct rman     sc_intr_rman;
   72         struct rman     sc_mem_rman;
   73 };
   74 
   75 #ifndef __aarch64__
   76 static device_identify_t ofwbus_identify;
   77 #endif
   78 static device_probe_t ofwbus_probe;
   79 static device_attach_t ofwbus_attach;
   80 static bus_alloc_resource_t ofwbus_alloc_resource;
   81 static bus_adjust_resource_t ofwbus_adjust_resource;
   82 static bus_release_resource_t ofwbus_release_resource;
   83 
   84 static device_method_t ofwbus_methods[] = {
   85         /* Device interface */
   86 #ifndef __aarch64__
   87         DEVMETHOD(device_identify,      ofwbus_identify),
   88 #endif
   89         DEVMETHOD(device_probe,         ofwbus_probe),
   90         DEVMETHOD(device_attach,        ofwbus_attach),
   91 
   92         /* Bus interface */
   93         DEVMETHOD(bus_alloc_resource,   ofwbus_alloc_resource),
   94         DEVMETHOD(bus_adjust_resource,  ofwbus_adjust_resource),
   95         DEVMETHOD(bus_release_resource, ofwbus_release_resource),
   96 
   97         DEVMETHOD_END
   98 };
   99 
  100 DEFINE_CLASS_1(ofwbus, ofwbus_driver, ofwbus_methods,
  101     sizeof(struct ofwbus_softc), simplebus_driver);
  102 EARLY_DRIVER_MODULE(ofwbus, nexus, ofwbus_driver, 0, 0,
  103     BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
  104 MODULE_VERSION(ofwbus, 1);
  105 
  106 #ifndef __aarch64__
  107 static void
  108 ofwbus_identify(driver_t *driver, device_t parent)
  109 {
  110 
  111         /* Check if Open Firmware has been instantiated */
  112         if (OF_peer(0) == 0)
  113                 return;
  114 
  115         if (device_find_child(parent, "ofwbus", -1) == NULL)
  116                 BUS_ADD_CHILD(parent, 0, "ofwbus", -1);
  117 }
  118 #endif
  119 
  120 static int
  121 ofwbus_probe(device_t dev)
  122 {
  123 
  124 #ifdef __aarch64__
  125         if (OF_peer(0) == 0)
  126                 return (ENXIO);
  127 #endif
  128 
  129         device_set_desc(dev, "Open Firmware Device Tree");
  130         return (BUS_PROBE_NOWILDCARD);
  131 }
  132 
  133 static int
  134 ofwbus_attach(device_t dev)
  135 {
  136         struct ofwbus_softc *sc;
  137         phandle_t node;
  138         struct ofw_bus_devinfo obd;
  139 
  140         sc = device_get_softc(dev);
  141 
  142         node = OF_peer(0);
  143 
  144         /*
  145          * If no Open Firmware, bail early
  146          */
  147         if (node == -1)
  148                 return (ENXIO);
  149 
  150         /*
  151          * ofwbus bus starts on unamed node in FDT, so we cannot make
  152          * ofw_bus_devinfo from it. Pass node to simplebus_init directly.
  153          */
  154         simplebus_init(dev, node);
  155         sc->sc_intr_rman.rm_type = RMAN_ARRAY;
  156         sc->sc_intr_rman.rm_descr = "Interrupts";
  157         sc->sc_mem_rman.rm_type = RMAN_ARRAY;
  158         sc->sc_mem_rman.rm_descr = "Device Memory";
  159         if (rman_init(&sc->sc_intr_rman) != 0 ||
  160             rman_init(&sc->sc_mem_rman) != 0 ||
  161             rman_manage_region(&sc->sc_intr_rman, 0, ~0) != 0 ||
  162             rman_manage_region(&sc->sc_mem_rman, 0, BUS_SPACE_MAXADDR) != 0)
  163                 panic("%s: failed to set up rmans.", __func__);
  164 
  165         /*
  166          * Allow devices to identify.
  167          */
  168         bus_generic_probe(dev);
  169 
  170         /*
  171          * Now walk the OFW tree and attach top-level devices.
  172          */
  173         for (node = OF_child(node); node > 0; node = OF_peer(node)) {
  174                 if (ofw_bus_gen_setup_devinfo(&obd, node) != 0)
  175                         continue;
  176                 simplebus_add_device(dev, node, 0, NULL, -1, NULL);
  177         }
  178         return (bus_generic_attach(dev));
  179 }
  180 
  181 static struct resource *
  182 ofwbus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  183     rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
  184 {
  185         struct ofwbus_softc *sc;
  186         struct rman *rm;
  187         struct resource *rv;
  188         struct resource_list_entry *rle;
  189         int isdefault, passthrough;
  190 
  191         isdefault = RMAN_IS_DEFAULT_RANGE(start, end);
  192         passthrough = (device_get_parent(child) != bus);
  193         sc = device_get_softc(bus);
  194         rle = NULL;
  195         if (!passthrough && isdefault) {
  196                 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child),
  197                     type, *rid);
  198                 if (rle == NULL) {
  199                         if (bootverbose)
  200                                 device_printf(bus, "no default resources for "
  201                                     "rid = %d, type = %d\n", *rid, type);
  202                         return (NULL);
  203                 }
  204                 start = rle->start;
  205                 count = ummax(count, rle->count);
  206                 end = ummax(rle->end, start + count - 1);
  207         }
  208 
  209         switch (type) {
  210         case SYS_RES_IRQ:
  211                 rm = &sc->sc_intr_rman;
  212                 break;
  213         case SYS_RES_MEMORY:
  214                 rm = &sc->sc_mem_rman;
  215                 break;
  216         default:
  217                 return (NULL);
  218         }
  219 
  220         rv = rman_reserve_resource(rm, start, end, count, flags & ~RF_ACTIVE,
  221             child);
  222         if (rv == NULL)
  223                 return (NULL);
  224         rman_set_rid(rv, *rid);
  225 
  226         if ((flags & RF_ACTIVE) != 0 && bus_activate_resource(child, type,
  227             *rid, rv) != 0) {
  228                 rman_release_resource(rv);
  229                 return (NULL);
  230         }
  231 
  232         if (!passthrough && rle != NULL) {
  233                 rle->res = rv;
  234                 rle->start = rman_get_start(rv);
  235                 rle->end = rman_get_end(rv);
  236                 rle->count = rle->end - rle->start + 1;
  237         }
  238 
  239         return (rv);
  240 }
  241 
  242 static int
  243 ofwbus_adjust_resource(device_t bus, device_t child __unused, int type,
  244     struct resource *r, rman_res_t start, rman_res_t end)
  245 {
  246         struct ofwbus_softc *sc;
  247         struct rman *rm;
  248         device_t ofwbus;
  249 
  250         ofwbus = bus;
  251         while (strcmp(device_get_name(device_get_parent(ofwbus)), "root") != 0)
  252                 ofwbus = device_get_parent(ofwbus);
  253         sc = device_get_softc(ofwbus);
  254         switch (type) {
  255         case SYS_RES_IRQ:
  256                 rm = &sc->sc_intr_rman;
  257                 break;
  258         case SYS_RES_MEMORY:
  259                 rm = &sc->sc_mem_rman;
  260                 break;
  261         default:
  262                 return (EINVAL);
  263         }
  264         if (rm == NULL)
  265                 return (ENXIO);
  266         if (rman_is_region_manager(r, rm) == 0)
  267                 return (EINVAL);
  268         return (rman_adjust_resource(r, start, end));
  269 }
  270 
  271 static int
  272 ofwbus_release_resource(device_t bus, device_t child, int type,
  273     int rid, struct resource *r)
  274 {
  275         struct resource_list_entry *rle;
  276         int passthrough;
  277         int error;
  278 
  279         passthrough = (device_get_parent(child) != bus);
  280         if (!passthrough) {
  281                 /* Clean resource list entry */
  282                 rle = resource_list_find(BUS_GET_RESOURCE_LIST(bus, child),
  283                     type, rid);
  284                 if (rle != NULL)
  285                         rle->res = NULL;
  286         }
  287 
  288         if ((rman_get_flags(r) & RF_ACTIVE) != 0) {
  289                 error = bus_deactivate_resource(child, type, rid, r);
  290                 if (error)
  291                         return (error);
  292         }
  293         return (rman_release_resource(r));
  294 }
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FreeBSD/Linux Kernel Cross Reference sys/dev/ofw/ofwbus.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/ofw/ofwbus.c
