sys/isa/isahint.c

   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("$FreeBSD$");
  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 }