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/6.2/sys/arm/arm/nexus.c 147166 2005-06-09 12:26:20Z cognet $");
   44 
   45 #define __RMAN_RESOURCE_VISIBLE
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/bus.h>
   49 #include <sys/kernel.h>
   50 #include <sys/malloc.h>
   51 #include <sys/module.h>
   52 #include <machine/bus.h>
   53 #include <sys/rman.h>
   54 #include <sys/interrupt.h>
   55 
   56 #include <machine/vmparam.h>
   57 #include <machine/pcb.h>
   58 #include <vm/vm.h>
   59 #include <vm/pmap.h>
   60 #include <machine/pmap.h>
   61 
   62 #include <machine/resource.h>
   63 #include <machine/intr.h>
   64 
   65 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device");
   66 
   67 struct nexus_device {
   68         struct resource_list    nx_resources;
   69 };
   70 
   71 #define DEVTONX(dev)    ((struct nexus_device *)device_get_ivars(dev))
   72 
   73 static struct rman mem_rman;
   74 
   75 static  int nexus_probe(device_t);
   76 static  int nexus_attach(device_t);
   77 static  int nexus_print_child(device_t, device_t);
   78 static  device_t nexus_add_child(device_t, int, const char *, int);
   79 static  struct resource *nexus_alloc_resource(device_t, device_t, int, int *,
   80         u_long, u_long, u_long, u_int);
   81 static  int nexus_activate_resource(device_t, device_t, int, int,
   82         struct resource *);
   83 static int
   84 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
   85         driver_intr_t *intr, void *arg, void **cookiep);
   86 static int
   87 nexus_teardown_intr(device_t, device_t, struct resource *, void *);
   88 
   89 static device_method_t nexus_methods[] = {
   90         /* Device interface */
   91         DEVMETHOD(device_probe,         nexus_probe),
   92         DEVMETHOD(device_attach,        nexus_attach),
   93         /* Bus interface */
   94         DEVMETHOD(bus_print_child,      nexus_print_child),
   95         DEVMETHOD(bus_add_child,        nexus_add_child),
   96         DEVMETHOD(bus_alloc_resource,   nexus_alloc_resource),
   97         DEVMETHOD(bus_activate_resource,        nexus_activate_resource),
   98         DEVMETHOD(bus_setup_intr,       nexus_setup_intr),
   99         DEVMETHOD(bus_teardown_intr,    nexus_teardown_intr),
  100         { 0, 0 }
  101 };
  102 
  103 static driver_t nexus_driver = {
  104         "nexus",
  105         nexus_methods,
  106         1                       /* no softc */
  107 };
  108 static devclass_t nexus_devclass;
  109 
  110 static int
  111 nexus_probe(device_t dev)
  112 {
  113         device_quiet(dev);      /* suppress attach message for neatness */
  114                 
  115         mem_rman.rm_start = 0;
  116         mem_rman.rm_end = ~0u;
  117         mem_rman.rm_type = RMAN_ARRAY;
  118         mem_rman.rm_descr = "I/O memory addresses";
  119         if (rman_init(&mem_rman)
  120                 || rman_manage_region(&mem_rman, 0, ~0u))
  121                 panic("nexus_probe mem_rman");
  122                 
  123         return (0);
  124         return bus_generic_probe(dev);
  125 }
  126 
  127 static int
  128 nexus_setup_intr(device_t dev, device_t child, struct resource *res, int flags,
  129     driver_intr_t *intr, void *arg, void **cookiep)
  130 {
  131         arm_setup_irqhandler(device_get_nameunit(child), 
  132             intr, arg, res->r_start, flags, cookiep);
  133         return (0);
  134 }
  135 
  136 static int
  137 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih)
  138 {
  139         int error;
  140 
  141         arm_mask_irq(r->r_start);
  142         error = arm_remove_irqhandler(ih);
  143         return (error);
  144 }
  145 
  146 static int
  147 nexus_attach(device_t dev)
  148 {
  149         /*
  150          * First, deal with the children we know about already
  151          */
  152         bus_generic_probe(dev);
  153         bus_generic_attach(dev);
  154         
  155         return 0;
  156 }
  157 
  158 
  159 static int
  160 nexus_print_child(device_t bus, device_t child)
  161 {
  162         int retval = 0;
  163         
  164         retval += bus_print_child_header(bus, child);
  165         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  166         
  167         return (retval);
  168 }
  169 
  170 
  171 static device_t
  172 nexus_add_child(device_t bus, int order, const char *name, int unit)
  173 {
  174         device_t        child;
  175         struct nexus_device *ndev;
  176         
  177         ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO);
  178         if (!ndev)
  179                 return(0);
  180         resource_list_init(&ndev->nx_resources);
  181 
  182         child = device_add_child_ordered(bus, order, name, unit);
  183         
  184         /* should we free this in nexus_child_detached? */
  185         device_set_ivars(child, ndev);
  186         
  187         return(child);
  188 }
  189 
  190 
  191 /*
  192  * Allocate a resource on behalf of child.  NB: child is usually going to be a
  193  * child of one of our descendants, not a direct child of nexus0.
  194  * (Exceptions include footbridge.)
  195  */
  196 #define ARM_BUS_SPACE_MEM 1
  197 static struct resource *
  198 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid,
  199         u_long start, u_long end, u_long count, u_int flags)
  200 {
  201         struct resource *rv;
  202         struct rman *rm;
  203         int needactivate = flags & RF_ACTIVE;
  204 
  205         switch (type) {
  206         case SYS_RES_MEMORY:
  207                 rm = &mem_rman;
  208                 break;
  209                 
  210         default:
  211                 return 0;
  212         }
  213 
  214         rv = rman_reserve_resource(rm, start, end, count, flags, child);
  215         if (rv == 0)
  216                 return 0;
  217 
  218         rman_set_bustag(rv, (void*)ARM_BUS_SPACE_MEM);
  219         rman_set_bushandle(rv, rv->r_start);            
  220         
  221         if (needactivate) {
  222                 if (bus_activate_resource(child, type, *rid, rv)) {
  223                         rman_release_resource(rv);
  224                         return 0;
  225                 }
  226         }
  227         
  228         return rv;
  229 }
  230 
  231 
  232 static int
  233 nexus_activate_resource(device_t bus, device_t child, int type, int rid,
  234         struct resource *r)
  235 {
  236         /*
  237          * If this is a memory resource, map it into the kernel.
  238          */
  239         if (rman_get_bustag(r) == (void*)ARM_BUS_SPACE_MEM) {
  240                 caddr_t vaddr = 0;
  241                 u_int32_t paddr;
  242                 u_int32_t psize;
  243                 u_int32_t poffs;
  244                 
  245                 paddr = rman_get_start(r);
  246                 psize = rman_get_size(r);
  247                 poffs = paddr - trunc_page(paddr);
  248                 vaddr = (caddr_t) pmap_mapdev(paddr-poffs, psize+poffs) + poffs;
  249                 rman_set_virtual(r, vaddr);
  250                 rman_set_bushandle(r, (bus_space_handle_t) vaddr);
  251         }
  252         return (rman_activate_resource(r));
  253 }
  254 
  255 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0);

Cache object: 0b690c0ec2f97bc33263644fff8f6087


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