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/arm/arm/nexus.c

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    1 /*-
    2  * Copyright 1998 Massachusetts Institute of Technology
    3  *
    4  * Permission to use, copy, modify, and distribute this software and
    5  * its documentation for any purpose and without fee is hereby
    6  * granted, provided that both the above copyright notice and this
    7  * permission notice appear in all copies, that both the above
    8  * copyright notice and this permission notice appear in all
    9  * supporting documentation, and that the name of M.I.T. not be used
   10  * in advertising or publicity pertaining to distribution of the
   11  * software without specific, written prior permission.  M.I.T. makes
   12  * no representations about the suitability of this software for any
   13  * purpose.  It is provided "as is" without express or implied
   14  * warranty.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  */
   30 
   31 /*
   32  * This code implements a `root nexus' for Arm Architecture
   33  * machines.  The function of the root nexus is to serve as an
   34  * attachment point for both processors and buses, and to manage
   35  * resources which are common to all of them.  In particular,
   36  * this code implements the core resource managers for interrupt
   37  * requests, DMA requests (which rightfully should be a part of the
   38  * ISA code but it's easier to do it here for now), I/O port addresses,
   39  * and I/O memory address space.
   40  */
   41 
   42 #include <sys/cdefs.h>
   43 __FBSDID("$FreeBSD: releng/9.1/sys/arm/arm/nexus.c 221218 2011-04-29 18:41:21Z jhb $");
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/bus.h>
   48 #include <sys/kernel.h>
   49 #include <sys/malloc.h>
   50 #include <sys/module.h>
   51 #include <machine/bus.h>
   52 #include <sys/rman.h>
   53 #include <sys/interrupt.h>
   54 
   55 #include <machine/vmparam.h>
   56 #include <machine/pcb.h>
   57 #include <vm/vm.h>
   58 #include <vm/pmap.h>
   59 #include <machine/pmap.h>
   60 
   61 #include <machine/resource.h>
   62 #include <machine/intr.h>
   63 
   64 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
   65 
   66 struct nexus_device {
   67         struct resource_list    nx_resources;
   68 };
   69 
   70 #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
   71 
   72 static struct rman mem_rman;
   73 
   74 static  int nexus_probe(device_t);
   75 static  int nexus_attach(device_t);
   76 static  int nexus_print_child(device_t, device_t);
   77 static  device_t nexus_add_child(device_t, u_int, const char *, int);
   78 static  struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
   79     u_long, u_long, u_long, u_int);
   80 static  int nexus_activate_resource(device_t, device_t, int, int,
   81     struct resource *);
   82 static int nexus_setup_intr(device_t dev, device_t child, struct resource *res,
   83     int flags, driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep);
   84 static int nexus_teardown_intr(device_t, device_t, struct resource *, void *);
   85 
   86 static device_method_t nexus_methods[] = {
   87         /* Device interface */
   88         DEVMETHOD(device_probe,         nexus_probe),
   89         DEVMETHOD(device_attach,        nexus_attach),
   90         /* Bus interface */
   91         DEVMETHOD(bus_print_child,      nexus_print_child),
   92         DEVMETHOD(bus_add_child,        nexus_add_child),
   93         DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
   94         DEVMETHOD(bus_activate_resource,        nexus_activate_resource),
   95         DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
   96         DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
   97         { 0, 0 }
   98 };
   99 
  100 static driver_t nexus_driver = {
  101         "nexus",
  102         nexus_methods,
  103         1                       /* no softc */
  104 };
  105 static devclass_t nexus_devclass;
  106 
  107 static int
  108 nexus_probe(device_t dev)
  109 {
  110 
  111         device_quiet(dev);      /* suppress attach message for neatness */
  112 
  113         return (BUS_PROBE_DEFAULT);
  114 }
  115 
  116 static int
  117 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
  118     driver_filter_t *filt, driver_intr_t *intr, void *arg, void **cookiep)
  119 {
  120 
  121         if ((rman_get_flags(res) & RF_SHAREABLE) == 0)
  122                 flags |= INTR_EXCL;
  123 
  124         arm_setup_irqhandler(device_get_nameunit(child), 
  125             filt, intr, arg, rman_get_start(res), flags, cookiep);
  126         return (0);
  127 }
  128 
  129 static int
  130 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  131 {
  132 
  133         return (arm_remove_irqhandler(rman_get_start(r), ih));
  134 }
  135 
  136 static int
  137 nexus_attach(device_t dev)
  138 {
  139 
  140         mem_rman.rm_start = 0;
  141         mem_rman.rm_end = ~0ul;
  142         mem_rman.rm_type = RMAN_ARRAY;
  143         mem_rman.rm_descr = "I/O memory addresses";
  144         if (rman_init(&mem_rman) || rman_manage_region(&mem_rman, 0, ~0))
  145                 panic("nexus_probe mem_rman");
  146 
  147         /*
  148          * First, deal with the children we know about already
  149          */
  150         bus_generic_probe(dev);
  151         bus_generic_attach(dev);
  152 
  153         return (0);
  154 }
  155 
  156 
  157 static int
  158 nexus_print_child(device_t bus, device_t child)
  159 {
  160         int retval = 0;
  161 
  162         retval += bus_print_child_header(bus, child);
  163         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  164 
  165         return (retval);
  166 }
  167 
  168 static device_t
  169 nexus_add_child(device_t bus, u_int order, const char *name, int unit)
  170 {
  171         device_t child;
  172         struct nexus_device *ndev;
  173 
  174         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  175         if (!ndev)
  176                 return (0);
  177         resource_list_init(&ndev->nx_resources);
  178 
  179         child = device_add_child_ordered(bus, order, name, unit);
  180 
  181         /* should we free this in nexus_child_detached? */
  182         device_set_ivars(child, ndev);
  183 
  184         return (child);
  185 }
  186 
  187 
  188 /*
  189  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  190  * child of one of our descendants, not a direct child of nexus0.
  191  * (Exceptions include footbridge.)
  192  */
  193 #define ARM_BUS_SPACE_MEM 1
  194 static struct resource *
  195 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  196     u_long start, u_long end, u_long count, u_int flags)
  197 {
  198         struct resource *rv;
  199         struct rman *rm;
  200         int needactivate = flags & RF_ACTIVE;
  201 
  202         switch (type) {
  203         case SYS_RES_MEMORY:
  204                 rm = &mem_rman;
  205                 break;
  206 
  207         default:
  208                 return (0);
  209         }
  210 
  211         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  212         if (rv == 0)
  213                 return (0);
  214 
  215         rman_set_rid(rv, *rid);
  216         rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM);
  217         rman_set_bushandle(rv, rman_get_start(rv));
  218 
  219         if (needactivate) {
  220                 if (bus_activate_resource(child, type, *rid, rv)) {
  221                         rman_release_resource(rv);
  222                         return (0);
  223                 }
  224         }
  225 
  226         return (rv);
  227 }
  228 
  229 
  230 static int
  231 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  232     struct resource *r)
  233 {
  234         /*
  235          * If this is a memory resource, map it into the kernel.
  236          */
  237         if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) {
  238                 caddr_t vaddr = 0;
  239                 u_int32_t paddr;
  240                 u_int32_t psize;
  241                 u_int32_t poffs;
  242 
  243                 paddr = rman_get_start(r);
  244                 psize = rman_get_size(r);
  245                 poffs = paddr - trunc_page(paddr);
  246                 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
  247                 rman_set_virtual(r, vaddr);
  248                 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
  249         }
  250         return (rman_activate_resource(r));
  251 }
  252 
  253 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);

Cache object: 40f4a9b615d01ae135faf6cffd8aadf3


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