The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/powerpc/powerpc/nexus.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 
   47 #include <vm/vm.h>
   48 #include <vm/pmap.h>
   49 
   50 #include <dev/ofw/ofw_bus.h>
   51 #include <dev/ofw/ofw_bus_subr.h>
   52 #include <dev/ofw/openfirm.h>
   53 
   54 #include <machine/bus.h>
   55 #include <machine/intr_machdep.h>
   56 #include <machine/resource.h>
   57 
   58 /*
   59  * The nexus handles root-level resource allocation requests and interrupt
   60  * mapping. All direct subdevices of nexus are attached by DEVICE_IDENTIFY().
   61  */
   62 
   63 static device_probe_t nexus_probe;
   64 static device_attach_t nexus_attach;
   65 static bus_setup_intr_t nexus_setup_intr;
   66 static bus_teardown_intr_t nexus_teardown_intr;
   67 static bus_activate_resource_t nexus_activate_resource;
   68 static bus_deactivate_resource_t nexus_deactivate_resource;
   69 static bus_space_tag_t nexus_get_bus_tag(device_t, device_t);
   70 #ifdef SMP
   71 static bus_bind_intr_t nexus_bind_intr;
   72 #endif
   73 static bus_config_intr_t nexus_config_intr;
   74 static ofw_bus_map_intr_t nexus_ofw_map_intr;
   75 
   76 static device_method_t nexus_methods[] = {
   77         /* Device interface */
   78         DEVMETHOD(device_probe,         nexus_probe),
   79         DEVMETHOD(device_attach,        nexus_attach),
   80 
   81         /* Bus interface */
   82         DEVMETHOD(bus_add_child,        bus_generic_add_child),
   83         DEVMETHOD(bus_activate_resource,        nexus_activate_resource),
   84         DEVMETHOD(bus_deactivate_resource,      nexus_deactivate_resource),
   85         DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
   86         DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
   87 #ifdef SMP
   88         DEVMETHOD(bus_bind_intr,        nexus_bind_intr),
   89 #endif
   90         DEVMETHOD(bus_config_intr,      nexus_config_intr),
   91         DEVMETHOD(bus_get_bus_tag,      nexus_get_bus_tag),
   92 
   93         /* ofw_bus interface */
   94         DEVMETHOD(ofw_bus_map_intr,     nexus_ofw_map_intr),
   95 
   96         DEVMETHOD_END
   97 };
   98 
   99 static devclass_t nexus_devclass;
  100 
  101 DEFINE_CLASS_0(nexus, nexus_driver, nexus_methods, 1);
  102 EARLY_DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0,
  103     BUS_PASS_BUS);
  104 MODULE_VERSION(nexus, 1);
  105 
  106 static int
  107 nexus_probe(device_t dev)
  108 {
  109         
  110         device_quiet(dev);      /* suppress attach message for neatness */
  111 
  112         return (BUS_PROBE_DEFAULT);
  113 }
  114 
  115 static int
  116 nexus_attach(device_t dev)
  117 {
  118 
  119         bus_generic_probe(dev);
  120         bus_generic_attach(dev);
  121 
  122         return (0);
  123 }
  124 
  125 static int
  126 nexus_setup_intr(device_t bus __unused, device_t child, struct resource *r,
  127     int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg,
  128     void **cookiep)
  129 {
  130         int error;
  131 
  132         if (r == NULL)
  133                 panic("%s: NULL interrupt resource!", __func__);
  134 
  135         if ((rman_get_flags(r) & RF_SHAREABLE) == 0)
  136                 flags |= INTR_EXCL;
  137 
  138         /* We depend here on rman_activate_resource() being idempotent. */
  139         error = rman_activate_resource(r);
  140         if (error)
  141                 return (error);
  142 
  143         error = powerpc_setup_intr(device_get_nameunit(child),
  144             rman_get_start(r), filt, intr, arg, flags, cookiep);
  145 
  146         return (error);
  147 }
  148 
  149 static int
  150 nexus_teardown_intr(device_t bus __unused, device_t child __unused,
  151     struct resource *r, void *ih)
  152 {
  153         
  154         if (r == NULL)
  155                 return (EINVAL);
  156 
  157         return (powerpc_teardown_intr(ih));
  158 }
  159 
  160 static bus_space_tag_t
  161 nexus_get_bus_tag(device_t bus __unused, device_t child __unused)
  162 {
  163 
  164         return(&bs_be_tag);
  165 }
  166 
  167 #ifdef SMP
  168 static int
  169 nexus_bind_intr(device_t bus __unused, device_t child __unused,
  170     struct resource *r, int cpu)
  171 {
  172 
  173         return (powerpc_bind_intr(rman_get_start(r), cpu));
  174 }
  175 #endif
  176 
  177 static int
  178 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig,
  179     enum intr_polarity pol)
  180 {
  181  
  182         return (powerpc_config_intr(irq, trig, pol));
  183 } 
  184 
  185 static int
  186 nexus_ofw_map_intr(device_t dev, device_t child, phandle_t iparent, int icells,
  187     pcell_t *irq)
  188 {
  189         u_int intr = MAP_IRQ(iparent, irq[0]);
  190         if (icells > 1)
  191                 powerpc_fw_config_intr(intr, irq[1]);
  192         return (intr);
  193 }
  194 
  195 static int
  196 nexus_activate_resource(device_t bus __unused, device_t child __unused,
  197     int type, int rid __unused, struct resource *r)
  198 {
  199 
  200         if (type == SYS_RES_MEMORY) {
  201                 vm_paddr_t start;
  202                 void *p;
  203 
  204                 start = (vm_paddr_t) rman_get_start(r);
  205                 if (bootverbose)
  206                         printf("nexus mapdev: start %jx, len %jd\n",
  207                             (uintmax_t)start, rman_get_size(r));
  208 
  209                 p = pmap_mapdev(start, (vm_size_t) rman_get_size(r));
  210                 if (p == NULL)
  211                         return (ENOMEM);
  212                 rman_set_virtual(r, p);
  213                 rman_set_bustag(r, &bs_be_tag);
  214                 rman_set_bushandle(r, (u_long)p);
  215         }
  216         return (rman_activate_resource(r));
  217 }
  218 
  219 static int
  220 nexus_deactivate_resource(device_t bus __unused, device_t child __unused,
  221     int type __unused, int rid __unused, struct resource *r)
  222 {
  223 
  224         /*
  225          * If this is a memory resource, unmap it.
  226          */
  227         if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
  228                 bus_size_t psize;
  229 
  230                 psize = rman_get_size(r);
  231                 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), psize);
  232         }
  233 
  234         return (rman_deactivate_resource(r));
  235 }
  236 

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