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/isa/isahint.c

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    1 /*-
    2  * Copyright (c) 1999 Doug Rabson
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.3/sys/isa/isahint.c 199583 2009-11-20 15:27:52Z jhb $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/bus.h>
   34 #include <sys/module.h>
   35 #include <isa/isavar.h>
   36 #include <isa/isa_common.h>
   37 #include <machine/resource.h>
   38 
   39 void
   40 isa_hinted_child(device_t parent, const char *name, int unit)
   41 {
   42         device_t        child;
   43         int             sensitive, start, count;
   44         int             order;
   45 
   46         /* device-specific flag overrides any wildcard */
   47         sensitive = 0;
   48         if (resource_int_value(name, unit, "sensitive", &sensitive) != 0)
   49                 resource_int_value(name, -1, "sensitive", &sensitive);
   50 
   51         if (sensitive)
   52                 order = ISA_ORDER_SENSITIVE;
   53         else
   54                 order = ISA_ORDER_SPECULATIVE;
   55 
   56         child = BUS_ADD_CHILD(parent, order, name, unit);
   57         if (child == 0)
   58                 return;
   59 
   60         start = 0;
   61         count = 0;
   62         resource_int_value(name, unit, "port", &start);
   63         resource_int_value(name, unit, "portsize", &count);
   64         if (start > 0 || count > 0)
   65                 bus_set_resource(child, SYS_RES_IOPORT, 0, start, count);
   66 
   67         start = 0;
   68         count = 0;
   69         resource_int_value(name, unit, "maddr", &start);
   70         resource_int_value(name, unit, "msize", &count);
   71         if (start > 0 || count > 0)
   72                 bus_set_resource(child, SYS_RES_MEMORY, 0, start, count);
   73 
   74         if (resource_int_value(name, unit, "irq", &start) == 0 && start > 0)
   75                 bus_set_resource(child, SYS_RES_IRQ, 0, start, 1);
   76 
   77         if (resource_int_value(name, unit, "drq", &start) == 0 && start >= 0)
   78                 bus_set_resource(child, SYS_RES_DRQ, 0, start, 1);
   79 
   80         if (resource_disabled(name, unit))
   81                 device_disable(child);
   82 
   83         isa_set_configattr(child, (isa_get_configattr(child)|ISACFGATTR_HINTS));
   84 }
   85 
   86 static int
   87 isa_match_resource_hint(device_t dev, int type, long value)
   88 {
   89         struct isa_device* idev = DEVTOISA(dev);
   90         struct resource_list *rl = &idev->id_resources;
   91         struct resource_list_entry *rle;
   92 
   93         STAILQ_FOREACH(rle, rl, link) {
   94                 if (rle->type != type)
   95                         continue;
   96                 if (rle->start <= value && rle->end >= value)
   97                         return (1);
   98         }
   99         return (0);
  100 }
  101 
  102 void
  103 isa_hint_device_unit(device_t bus, device_t child, const char *name, int *unitp)
  104 {
  105         const char *s;
  106         long value;
  107         int line, matches, unit;
  108 
  109         line = 0;
  110         for (;;) {
  111                 if (resource_find_dev(&line, name, &unit, "at", NULL) != 0)
  112                         break;
  113 
  114                 /* Must have an "at" for isa. */
  115                 resource_string_value(name, unit, "at", &s);
  116                 if (!(strcmp(s, device_get_nameunit(bus)) == 0 ||
  117                     strcmp(s, device_get_name(bus)) == 0))
  118                         continue;
  119 
  120                 /*
  121                  * Check for matching resources.  We must have at
  122                  * least one match.  Since I/O and memory resources
  123                  * cannot be shared, if we get a match on either of
  124                  * those, ignore any mismatches in IRQs or DRQs.
  125                  *
  126                  * XXX: We may want to revisit this to be more lenient
  127                  * and wire as long as it gets one match.
  128                  */
  129                 matches = 0;
  130                 if (resource_long_value(name, unit, "port", &value) == 0) {
  131                         /*
  132                          * Floppy drive controllers are notorious for
  133                          * having a wide variety of resources not all
  134                          * of which include the first port that is
  135                          * specified by the hint (typically 0x3f0)
  136                          * (see the comment above
  137                          * fdc_isa_alloc_resources() in fdc_isa.c).
  138                          * However, they do all seem to include port +
  139                          * 2 (e.g. 0x3f2) so for a floppy device, look
  140                          * for 'value + 2' in the port resources
  141                          * instead of the hint value.
  142                          */
  143                         if (strcmp(name, "fdc") == 0)
  144                                 value += 2;
  145                         if (isa_match_resource_hint(child, SYS_RES_IOPORT,
  146                             value))
  147                                 matches++;
  148                         else
  149                                 continue;
  150                 }
  151                 if (resource_long_value(name, unit, "maddr", &value) == 0) {
  152                         if (isa_match_resource_hint(child, SYS_RES_MEMORY,
  153                             value))
  154                                 matches++;
  155                         else
  156                                 continue;
  157                 }
  158                 if (matches > 0)
  159                         goto matched;
  160                 if (resource_long_value(name, unit, "irq", &value) == 0) {
  161                         if (isa_match_resource_hint(child, SYS_RES_IRQ, value))
  162                                 matches++;
  163                         else
  164                                 continue;
  165                 }
  166                 if (resource_long_value(name, unit, "drq", &value) == 0) {
  167                         if (isa_match_resource_hint(child, SYS_RES_DRQ, value))
  168                                 matches++;
  169                         else
  170                                 continue;
  171                 }
  172 
  173         matched:
  174                 if (matches > 0) {
  175                         /* We have a winner! */
  176                         *unitp = unit;
  177                         break;
  178                 }
  179         }
  180 }

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