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  * $FreeBSD: releng/5.1/sys/i386/isa/isa.c 90762 2002-02-17 09:16:45Z nyan $
   27  */
   28 
   29 /*
   30  * Modifications for Intel architecture by Garrett A. Wollman.
   31  * Copyright 1998 Massachusetts Institute of Technology
   32  *
   33  * Permission to use, copy, modify, and distribute this software and
   34  * its documentation for any purpose and without fee is hereby
   35  * granted, provided that both the above copyright notice and this
   36  * permission notice appear in all copies, that both the above
   37  * copyright notice and this permission notice appear in all
   38  * supporting documentation, and that the name of M.I.T. not be used
   39  * in advertising or publicity pertaining to distribution of the
   40  * software without specific, written prior permission.  M.I.T. makes
   41  * no representations about the suitability of this software for any
   42  * purpose.  It is provided "as is" without express or implied
   43  * warranty.
   44  * 
   45  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   46  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   47  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   48  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   49  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   50  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   51  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   52  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   53  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   54  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   55  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   56  * SUCH DAMAGE.
   57  */
   58 
   59 #include <sys/param.h>
   60 #include <sys/bus.h>
   61 #include <sys/malloc.h>
   62 #include <machine/bus.h>
   63 #include <sys/rman.h>
   64 #ifdef PC98
   65 #include <sys/systm.h>
   66 #endif
   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. We allow rid 0-1 for
   92          * irq and drq, 0-3 for memory and 0-7 for ports which is
   93          * sufficient for isapnp.
   94          */
   95         int passthrough = (device_get_parent(child) != bus);
   96         int isdefault = (start == 0UL && end == ~0UL);
   97         struct isa_device* idev = DEVTOISA(child);
   98         struct resource_list *rl = &idev->id_resources;
   99         struct resource_list_entry *rle;
  100         
  101         if (!passthrough && !isdefault) {
  102                 rle = resource_list_find(rl, type, *rid);
  103                 if (!rle) {
  104                         if (*rid < 0)
  105                                 return 0;
  106                         switch (type) {
  107                         case SYS_RES_IRQ:
  108                                 if (*rid >= ISA_NIRQ)
  109                                         return 0;
  110                                 break;
  111                         case SYS_RES_DRQ:
  112                                 if (*rid >= ISA_NDRQ)
  113                                         return 0;
  114                                 break;
  115                         case SYS_RES_MEMORY:
  116                                 if (*rid >= ISA_NMEM)
  117                                         return 0;
  118                                 break;
  119                         case SYS_RES_IOPORT:
  120                                 if (*rid >= ISA_NPORT)
  121                                         return 0;
  122                                 break;
  123                         default:
  124                                 return 0;
  125                         }
  126                         resource_list_add(rl, type, *rid, start, end, count);
  127                 }
  128         }
  129 
  130         return resource_list_alloc(rl, bus, child, type, rid,
  131                                    start, end, count, flags);
  132 }
  133 
  134 #ifdef PC98
  135 /*
  136  * Indirection support.  The type of bus_space_handle_t is
  137  * defined in sys/i386/include/bus_pc98.h.
  138  */
  139 struct resource *
  140 isa_alloc_resourcev(device_t child, int type, int *rid,
  141                     bus_addr_t *res, bus_size_t count, u_int flags)
  142 {
  143         struct isa_device* idev = DEVTOISA(child);
  144         struct resource_list *rl = &idev->id_resources;
  145 
  146         device_t        bus = device_get_parent(child);
  147         bus_addr_t      start;
  148         struct resource *re;
  149         struct resource **bsre;
  150         int             i, j, k, linear_cnt, ressz, bsrid;
  151 
  152         start = bus_get_resource_start(child, type, *rid);
  153 
  154         linear_cnt = count;
  155         ressz = 1;
  156         for (i = 1; i < count; ++i) {
  157                 if (res[i] != res[i - 1] + 1) {
  158                         if (i < linear_cnt)
  159                                 linear_cnt = i;
  160                         ++ressz;
  161                 }
  162         }
  163 
  164         re = isa_alloc_resource(bus, child, type, rid,
  165                                 start + res[0], start + res[linear_cnt - 1],
  166                                 linear_cnt, flags);
  167         if (re == NULL)
  168                 return NULL;
  169 
  170         bsre = malloc(sizeof (struct resource *) * ressz, M_DEVBUF, M_NOWAIT);
  171         if (bsre == NULL) {
  172                 resource_list_release(rl, bus, child, type, *rid, re);
  173                 return NULL;
  174         }
  175         bsre[0] = re;
  176 
  177         for (i = linear_cnt, k = 1; i < count; i = j, k++) {
  178                 for (j = i + 1; j < count; j++) {
  179                         if (res[j] != res[j - 1] + 1)
  180                                 break;
  181                 }
  182                 bsrid = *rid + k;
  183                 bsre[k] = isa_alloc_resource(bus, child, type, &bsrid,
  184                         start + res[i], start + res[j - 1], j - i, flags);
  185                 if (bsre[k] == NULL) {
  186                         for (k--; k >= 0; k--)
  187                                 resource_list_release(rl, bus, child, type,
  188                                                       *rid + k, bsre[k]);
  189                         free(bsre, M_DEVBUF);
  190                         return NULL;
  191                 }
  192         }
  193 
  194         re->r_bushandle->bsh_res = bsre;
  195         re->r_bushandle->bsh_ressz = ressz;
  196 
  197         return re;
  198 }
  199 
  200 int
  201 isa_load_resourcev(struct resource *re, bus_addr_t *res, bus_size_t count)
  202 {
  203         bus_addr_t      start;
  204         int             i;
  205 
  206         if (count > re->r_bushandle->bsh_maxiatsz) {
  207                 printf("isa_load_resourcev: map size too large\n");
  208                 return EINVAL;
  209         }
  210 
  211         start = rman_get_start(re);
  212         for (i = 0; i < re->r_bushandle->bsh_maxiatsz; i++) {
  213                 if (i < count)
  214                         re->r_bushandle->bsh_iat[i] = start + res[i];
  215                 else
  216                         re->r_bushandle->bsh_iat[i] = start;
  217         }
  218 
  219         re->r_bushandle->bsh_iatsz = count;
  220         re->r_bushandle->bsh_bam = re->r_bustag->bs_ra; /* relocate access */
  221 
  222         return 0;
  223 }
  224 #endif  /* PC98 */
  225 
  226 int
  227 isa_release_resource(device_t bus, device_t child, int type, int rid,
  228                      struct resource *r)
  229 {
  230         struct isa_device* idev = DEVTOISA(child);
  231         struct resource_list *rl = &idev->id_resources;
  232 #ifdef PC98
  233         /*
  234          * Indirection support.  The type of bus_space_handle_t is
  235          * defined in sys/i386/include/bus_pc98.h.
  236          */
  237         int     i;
  238 
  239         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  240                 for (i = 1; i < r->r_bushandle->bsh_ressz; i++)
  241                         resource_list_release(rl, bus, child, type, rid + i,
  242                                               r->r_bushandle->bsh_res[i]);
  243                 if (r->r_bushandle->bsh_res != NULL)
  244                         free(r->r_bushandle->bsh_res, M_DEVBUF);
  245         }
  246 #endif
  247         return resource_list_release(rl, bus, child, type, rid, r);
  248 }
  249 
  250 /*
  251  * We can't use the bus_generic_* versions of these methods because those
  252  * methods always pass the bus param as the requesting device, and we need
  253  * to pass the child (the i386 nexus knows about this and is prepared to
  254  * deal).
  255  */
  256 int
  257 isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
  258                void (*ihand)(void *), void *arg, void **cookiep)
  259 {
  260         return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
  261                                ihand, arg, cookiep));
  262 }
  263 
  264 int
  265 isa_teardown_intr(device_t bus, device_t child, struct resource *r,
  266                   void *cookie)
  267 {
  268         return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
  269 }

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