isa.c

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    1 /*-
    2  * Copyright (c) 1998 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/8.0/sys/amd64/isa/isa.c 166901 2007-02-23 12:19:07Z piso $");
   29 
   30 /*-
   31  * Modifications for Intel architecture by Garrett A. Wollman.
   32  * Copyright 1998 Massachusetts Institute of Technology
   33  *
   34  * Permission to use, copy, modify, and distribute this software and
   35  * its documentation for any purpose and without fee is hereby
   36  * granted, provided that both the above copyright notice and this
   37  * permission notice appear in all copies, that both the above
   38  * copyright notice and this permission notice appear in all
   39  * supporting documentation, and that the name of M.I.T. not be used
   40  * in advertising or publicity pertaining to distribution of the
   41  * software without specific, written prior permission.  M.I.T. makes
   42  * no representations about the suitability of this software for any
   43  * purpose.  It is provided "as is" without express or implied
   44  * warranty.
   45  * 
   46  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   47  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   48  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   49  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   50  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   51  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   52  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   53  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   54  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   55  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   56  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   57  * SUCH DAMAGE.
   58  */
   59 
   60 #include <sys/param.h>
   61 #include <sys/bus.h>
   62 #include <sys/kernel.h>
   63 #include <sys/malloc.h>
   64 #include <sys/module.h>
   65 #include <machine/bus.h>
   66 #include <sys/rman.h>
   67 
   68 #include <machine/resource.h>
   69 
   70 #include <isa/isavar.h>
   71 #include <isa/isa_common.h>
   72 
   73 void
   74 isa_init(device_t dev)
   75 {
   76 }
   77 
   78 /*
   79  * This implementation simply passes the request up to the parent
   80  * bus, which in our case is the special i386 nexus, substituting any
   81  * configured values if the caller defaulted.  We can get away with
   82  * this because there is no special mapping for ISA resources on an Intel
   83  * platform.  When porting this code to another architecture, it may be
   84  * necessary to interpose a mapping layer here.
   85  */
   86 struct resource *
   87 isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
   88                    u_long start, u_long end, u_long count, u_int flags)
   89 {
   90         /*
   91          * Consider adding a resource definition.
   92          */
   93         int passthrough = (device_get_parent(child) != bus);
   94         int isdefault = (start == 0UL && end == ~0UL);
   95         struct isa_device* idev = DEVTOISA(child);
   96         struct resource_list *rl = &idev->id_resources;
   97         struct resource_list_entry *rle;
   98         
   99         if (!passthrough && !isdefault) {
  100                 rle = resource_list_find(rl, type, *rid);
  101                 if (!rle) {
  102                         if (*rid < 0)
  103                                 return 0;
  104                         switch (type) {
  105                         case SYS_RES_IRQ:
  106                                 if (*rid >= ISA_NIRQ)
  107                                         return 0;
  108                                 break;
  109                         case SYS_RES_DRQ:
  110                                 if (*rid >= ISA_NDRQ)
  111                                         return 0;
  112                                 break;
  113                         case SYS_RES_MEMORY:
  114                                 if (*rid >= ISA_NMEM)
  115                                         return 0;
  116                                 break;
  117                         case SYS_RES_IOPORT:
  118                                 if (*rid >= ISA_NPORT)
  119                                         return 0;
  120                                 break;
  121                         default:
  122                                 return 0;
  123                         }
  124                         resource_list_add(rl, type, *rid, start, end, count);
  125                 }
  126         }
  127 
  128         return resource_list_alloc(rl, bus, child, type, rid,
  129                                    start, end, count, flags);
  130 }
  131 
  132 int
  133 isa_release_resource(device_t bus, device_t child, int type, int rid,
  134                      struct resource *r)
  135 {
  136         struct isa_device* idev = DEVTOISA(child);
  137         struct resource_list *rl = &idev->id_resources;
  138 
  139         return resource_list_release(rl, bus, child, type, rid, r);
  140 }
  141 
  142 /*
  143  * We can't use the bus_generic_* versions of these methods because those
  144  * methods always pass the bus param as the requesting device, and we need
  145  * to pass the child (the i386 nexus knows about this and is prepared to
  146  * deal).
  147  */
  148 int
  149 isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
  150                driver_filter_t *filter, void (*ihand)(void *), void *arg, 
  151                void **cookiep)
  152 {
  153         return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
  154                                filter, ihand, arg, cookiep));
  155 }
  156 
  157 int
  158 isa_teardown_intr(device_t bus, device_t child, struct resource *r,
  159                   void *cookie)
  160 {
  161         return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
  162 }
  163 
  164 /*
  165  * On this platform, isa can also attach to the legacy bus.
  166  */
  167 DRIVER_MODULE(isa, legacy, isa_driver, isa_devclass, 0, 0);

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FreeBSD/Linux Kernel Cross Reference sys/amd64/isa/isa.c

FreeBSD/Linux Kernel Cross Reference
sys/amd64/isa/isa.c