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/i386/isa/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/5.3/sys/i386/isa/isa.c 131534 2004-07-03 20:11:49Z imp $");
   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 #ifdef PC98 
   61 #define __RMAN_RESOURCE_VISIBLE
   62 #endif
   63 #include <sys/param.h>
   64 #include <sys/bus.h>
   65 #include <sys/malloc.h>
   66 #include <machine/bus.h>
   67 #include <sys/rman.h>
   68 #ifdef PC98
   69 #include <sys/systm.h>
   70 #endif
   71 
   72 #include <machine/resource.h>
   73 
   74 #include <isa/isavar.h>
   75 #include <isa/isa_common.h>
   76 
   77 void
   78 isa_init(device_t dev)
   79 {
   80 }
   81 
   82 /*
   83  * This implementation simply passes the request up to the parent
   84  * bus, which in our case is the special i386 nexus, substituting any
   85  * configured values if the caller defaulted.  We can get away with
   86  * this because there is no special mapping for ISA resources on an Intel
   87  * platform.  When porting this code to another architecture, it may be
   88  * necessary to interpose a mapping layer here.
   89  */
   90 struct resource *
   91 isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
   92                    u_long start, u_long end, u_long count, u_int flags)
   93 {
   94         /*
   95          * Consider adding a resource definition.
   96          */
   97         int passthrough = (device_get_parent(child) != bus);
   98         int isdefault = (start == 0UL && end == ~0UL);
   99         struct isa_device* idev = DEVTOISA(child);
  100         struct resource_list *rl = &idev->id_resources;
  101         struct resource_list_entry *rle;
  102         
  103         if (!passthrough && !isdefault) {
  104                 rle = resource_list_find(rl, type, *rid);
  105                 if (!rle) {
  106                         if (*rid < 0)
  107                                 return 0;
  108                         switch (type) {
  109                         case SYS_RES_IRQ:
  110                                 if (*rid >= ISA_NIRQ)
  111                                         return 0;
  112                                 break;
  113                         case SYS_RES_DRQ:
  114                                 if (*rid >= ISA_NDRQ)
  115                                         return 0;
  116                                 break;
  117                         case SYS_RES_MEMORY:
  118                                 if (*rid >= ISA_NMEM)
  119                                         return 0;
  120                                 break;
  121                         case SYS_RES_IOPORT:
  122                                 if (*rid >= ISA_NPORT)
  123                                         return 0;
  124                                 break;
  125                         default:
  126                                 return 0;
  127                         }
  128                         resource_list_add(rl, type, *rid, start, end, count);
  129                 }
  130         }
  131 
  132         return resource_list_alloc(rl, bus, child, type, rid,
  133                                    start, end, count, flags);
  134 }
  135 
  136 #ifdef PC98
  137 /*
  138  * Indirection support.  The type of bus_space_handle_t is
  139  * defined in sys/i386/include/bus_pc98.h.
  140  */
  141 struct resource *
  142 isa_alloc_resourcev(device_t child, int type, int *rid,
  143                     bus_addr_t *res, bus_size_t count, u_int flags)
  144 {
  145         struct isa_device* idev = DEVTOISA(child);
  146         struct resource_list *rl = &idev->id_resources;
  147 
  148         device_t        bus = device_get_parent(child);
  149         bus_addr_t      start;
  150         bus_space_handle_t bh;
  151         struct resource *re;
  152         struct resource **bsre;
  153         int             i, j, k, linear_cnt, ressz, bsrid;
  154 
  155         start = bus_get_resource_start(child, type, *rid);
  156 
  157         linear_cnt = count;
  158         ressz = 1;
  159         for (i = 1; i < count; ++i) {
  160                 if (res[i] != res[i - 1] + 1) {
  161                         if (i < linear_cnt)
  162                                 linear_cnt = i;
  163                         ++ressz;
  164                 }
  165         }
  166 
  167         re = isa_alloc_resource(bus, child, type, rid,
  168                                 start + res[0], start + res[linear_cnt - 1],
  169                                 linear_cnt, flags);
  170         if (re == NULL)
  171                 return NULL;
  172 
  173         bsre = malloc(sizeof (struct resource *) * ressz, M_DEVBUF, M_NOWAIT);
  174         if (bsre == NULL) {
  175                 resource_list_release(rl, bus, child, type, *rid, re);
  176                 return NULL;
  177         }
  178         bsre[0] = re;
  179 
  180         for (i = linear_cnt, k = 1; i < count; i = j, k++) {
  181                 for (j = i + 1; j < count; j++) {
  182                         if (res[j] != res[j - 1] + 1)
  183                                 break;
  184                 }
  185                 bsrid = *rid + k;
  186                 bsre[k] = isa_alloc_resource(bus, child, type, &bsrid,
  187                         start + res[i], start + res[j - 1], j - i, flags);
  188                 if (bsre[k] == NULL) {
  189                         for (k--; k >= 0; k--)
  190                                 resource_list_release(rl, bus, child, type,
  191                                                       *rid + k, bsre[k]);
  192                         free(bsre, M_DEVBUF);
  193                         return NULL;
  194                 }
  195         }
  196 
  197         bh = rman_get_bushandle(re);
  198         bh->bsh_res = bsre;
  199         bh->bsh_ressz = ressz;
  200 
  201         return re;
  202 }
  203 
  204 int
  205 isa_load_resourcev(struct resource *re, bus_addr_t *res, bus_size_t count)
  206 {
  207         bus_addr_t      start;
  208         bus_space_handle_t bh;
  209         int             i;
  210 
  211         bh = rman_get_bushandle(re);
  212         if (count > bh->bsh_maxiatsz) {
  213                 printf("isa_load_resourcev: map size too large\n");
  214                 return EINVAL;
  215         }
  216 
  217         start = rman_get_start(re);
  218         for (i = 0; i < bh->bsh_maxiatsz; i++) {
  219                 if (i < count)
  220                         bh->bsh_iat[i] = start + res[i];
  221                 else
  222                         bh->bsh_iat[i] = start;
  223         }
  224 
  225         bh->bsh_iatsz = count;
  226         bh->bsh_bam = rman_get_bustag(re)->bs_ra;       /* relocate access */
  227 
  228         return 0;
  229 }
  230 #endif  /* PC98 */
  231 
  232 int
  233 isa_release_resource(device_t bus, device_t child, int type, int rid,
  234                      struct resource *r)
  235 {
  236         struct isa_device* idev = DEVTOISA(child);
  237         struct resource_list *rl = &idev->id_resources;
  238 #ifdef PC98
  239         /*
  240          * Indirection support.  The type of bus_space_handle_t is
  241          * defined in sys/i386/include/bus_pc98.h.
  242          */
  243         int     i;
  244         bus_space_handle_t bh;
  245 
  246         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  247                 bh = rman_get_bushandle(r);
  248                 for (i = 1; i < bh->bsh_ressz; i++)
  249                         resource_list_release(rl, bus, child, type, rid + i,
  250                                               bh->bsh_res[i]);
  251                 if (bh->bsh_res != NULL)
  252                         free(bh->bsh_res, M_DEVBUF);
  253         }
  254 #endif
  255         return resource_list_release(rl, bus, child, type, rid, r);
  256 }
  257 
  258 /*
  259  * We can't use the bus_generic_* versions of these methods because those
  260  * methods always pass the bus param as the requesting device, and we need
  261  * to pass the child (the i386 nexus knows about this and is prepared to
  262  * deal).
  263  */
  264 int
  265 isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
  266                void (*ihand)(void *), void *arg, void **cookiep)
  267 {
  268         return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
  269                                ihand, arg, cookiep));
  270 }
  271 
  272 int
  273 isa_teardown_intr(device_t bus, device_t child, struct resource *r,
  274                   void *cookie)
  275 {
  276         return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
  277 }

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