FreeBSD/Linux Kernel Cross Reference
sys/isa/isahint.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 1999 Doug Rabson
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/bus.h>
    #include <sys/module.h>
    #include <isa/isavar.h>
    #include <isa/isa_common.h>
    #include <machine/resource.h>
    
    void
    isa_hinted_child(device_t parent, const char *name, int unit)
    {
            device_t        child;
            int             sensitive, start, count;
            int             order;
    
            /* device-specific flag overrides any wildcard */
            sensitive = 0;
            if (resource_int_value(name, unit, "sensitive", &sensitive) != 0)
                    resource_int_value(name, -1, "sensitive", &sensitive);
    
            if (sensitive)
                    order = ISA_ORDER_SENSITIVE;
            else
                    order = ISA_ORDER_SPECULATIVE;
    
            child = BUS_ADD_CHILD(parent, order, name, unit);
            if (child == 0)
                    return;
    
            start = 0;
            count = 0;
            resource_int_value(name, unit, "port", &start);
            resource_int_value(name, unit, "portsize", &count);
            if (start > 0 || count > 0)
                    bus_set_resource(child, SYS_RES_IOPORT, 0, start, count);
    
            start = 0;
            count = 0;
            resource_int_value(name, unit, "maddr", &start);
            resource_int_value(name, unit, "msize", &count);
            if (start > 0 || count > 0)
                    bus_set_resource(child, SYS_RES_MEMORY, 0, start, count);
    
            if (resource_int_value(name, unit, "irq", &start) == 0 && start > 0)
                    bus_set_resource(child, SYS_RES_IRQ, 0, start, 1);
    
            if (resource_int_value(name, unit, "drq", &start) == 0 && start >= 0)
                    bus_set_resource(child, SYS_RES_DRQ, 0, start, 1);
    
            if (resource_disabled(name, unit))
                    device_disable(child);
    
            isa_set_configattr(child, (isa_get_configattr(child)|ISACFGATTR_HINTS));
    }
    
    static int
    isa_match_resource_hint(device_t dev, int type, long value)
    {
            struct isa_device* idev = DEVTOISA(dev);
            struct resource_list *rl = &idev->id_resources;
            struct resource_list_entry *rle;
    
            STAILQ_FOREACH(rle, rl, link) {
                    if (rle->type != type)
                            continue;
                    if (rle->start <= value && rle->end >= value)
                            return (1);
           }
           return (0);
   }
   
   void
   isa_hint_device_unit(device_t bus, device_t child, const char *name, int *unitp)
   {
           const char *s;
           long value;
           int line, matches, unit;
   
           line = 0;
           for (;;) {
                   if (resource_find_dev(&line, name, &unit, "at", NULL) != 0)
                           break;
   
                   /* Must have an "at" for isa. */
                   resource_string_value(name, unit, "at", &s);
                   if (!(strcmp(s, device_get_nameunit(bus)) == 0 ||
                       strcmp(s, device_get_name(bus)) == 0))
                           continue;
   
                   /*
                    * Check for matching resources.  We must have at
                    * least one match.  Since I/O and memory resources
                    * cannot be shared, if we get a match on either of
                    * those, ignore any mismatches in IRQs or DRQs.
                    *
                    * XXX: We may want to revisit this to be more lenient
                    * and wire as long as it gets one match.
                    */
                   matches = 0;
                   if (resource_long_value(name, unit, "port", &value) == 0) {
                           /*
                            * Floppy drive controllers are notorious for
                            * having a wide variety of resources not all
                            * of which include the first port that is
                            * specified by the hint (typically 0x3f0)
                            * (see the comment above
                            * fdc_isa_alloc_resources() in fdc_isa.c).
                            * However, they do all seem to include port +
                            * 2 (e.g. 0x3f2) so for a floppy device, look
                            * for 'value + 2' in the port resources
                            * instead of the hint value.
                            */
                           if (strcmp(name, "fdc") == 0)
                                   value += 2;
                           if (isa_match_resource_hint(child, SYS_RES_IOPORT,
                               value))
                                   matches++;
                           else
                                   continue;
                   }
                   if (resource_long_value(name, unit, "maddr", &value) == 0) {
                           if (isa_match_resource_hint(child, SYS_RES_MEMORY,
                               value))
                                   matches++;
                           else
                                   continue;
                   }
                   if (matches > 0)
                           goto matched;
                   if (resource_long_value(name, unit, "irq", &value) == 0) {
                           if (isa_match_resource_hint(child, SYS_RES_IRQ, value))
                                   matches++;
                           else
                                   continue;
                   }
                   if (resource_long_value(name, unit, "drq", &value) == 0) {
                           if (isa_match_resource_hint(child, SYS_RES_DRQ, value))
                                   matches++;
                           else
                                   continue;
                   }
   
           matched:
                   if (matches > 0) {
                           /* We have a winner! */
                           *unitp = unit;
                           break;
                   }
           }
   }

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