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  * $FreeBSD$
   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 
   65 #include <machine/resource.h>
   66 
   67 #include <isa/isavar.h>
   68 #include <isa/isa_common.h>
   69 
   70 void
   71 isa_init(void)
   72 {
   73     isa_wrap_old_drivers();
   74 }
   75 
   76 /*
   77  * This implementation simply passes the request up to the parent
   78  * bus, which in our case is the special i386 nexus, substituting any
   79  * configured values if the caller defaulted.  We can get away with
   80  * this because there is no special mapping for ISA resources on an Intel
   81  * platform.  When porting this code to another architecture, it may be
   82  * necessary to interpose a mapping layer here.
   83  */
   84 struct resource *
   85 isa_alloc_resource(device_t bus, device_t child, int type, int *rid,
   86                    u_long start, u_long end, u_long count, u_int flags)
   87 {
   88         /*
   89          * Consider adding a resource definition. We allow rid 0-1 for
   90          * irq and drq, 0-3 for memory and 0-7 for ports which is
   91          * sufficient for isapnp.
   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 #ifdef PC98
  133 /*
  134  * Indirection support.  The type of bus_space_handle_t is
  135  * defined in sys/i386/include/bus_pc98.h.
  136  */
  137 struct resource *
  138 isa_alloc_resourcev(device_t child, int type, int *rid,
  139                     bus_addr_t *res, bus_size_t count, u_int flags)
  140 {
  141         struct isa_device* idev = DEVTOISA(child);
  142         struct resource_list *rl = &idev->id_resources;
  143 
  144         device_t        bus = device_get_parent(child);
  145         bus_addr_t      start;
  146         struct resource *re;
  147         struct resource **bsre;
  148         int             i, j, k, linear_cnt, ressz, bsrid;
  149 
  150         start = bus_get_resource_start(child, type, *rid);
  151 
  152         linear_cnt = count;
  153         ressz = 1;
  154         for (i = 1; i < count; ++i) {
  155                 if (res[i] != res[i - 1] + 1) {
  156                         if (i < linear_cnt)
  157                                 linear_cnt = i;
  158                         ++ressz;
  159                 }
  160         }
  161 
  162         re = isa_alloc_resource(bus, child, type, rid,
  163                                 start + res[0], start + res[linear_cnt - 1],
  164                                 linear_cnt, flags);
  165         if (re == NULL)
  166                 return NULL;
  167 
  168         bsre = malloc(sizeof (struct resource *) * ressz, M_DEVBUF, M_NOWAIT);
  169         if (bsre == NULL) {
  170                 resource_list_release(rl, bus, child, type, *rid, re);
  171                 return NULL;
  172         }
  173         bsre[0] = re;
  174 
  175         for (i = linear_cnt, k = 1; i < count; i = j, k++) {
  176                 for (j = i + 1; j < count; j++) {
  177                         if (res[j] != res[j - 1] + 1)
  178                                 break;
  179                 }
  180                 bsrid = *rid + k;
  181                 bsre[k] = isa_alloc_resource(bus, child, type, &bsrid,
  182                         start + res[i], start + res[j - 1], j - i, flags);
  183                 if (bsre[k] == NULL) {
  184                         for (k--; k >= 0; k--)
  185                                 resource_list_release(rl, bus, child, type,
  186                                                       *rid + k, bsre[k]);
  187                         free(bsre, M_DEVBUF);
  188                         return NULL;
  189                 }
  190         }
  191 
  192         re->r_bushandle->bsh_res = bsre;
  193         re->r_bushandle->bsh_ressz = ressz;
  194 
  195         return re;
  196 }
  197 
  198 int
  199 isa_load_resourcev(struct resource *re, bus_addr_t *res, bus_size_t count)
  200 {
  201         bus_addr_t      start;
  202         int             i;
  203 
  204         if (count > re->r_bushandle->bsh_maxiatsz) {
  205                 printf("isa_load_resourcev: map size too large\n");
  206                 return EINVAL;
  207         }
  208 
  209         start = rman_get_start(re);
  210         for (i = 0; i < re->r_bushandle->bsh_maxiatsz; i++) {
  211                 if (i < count)
  212                         re->r_bushandle->bsh_iat[i] = start + res[i];
  213                 else
  214                         re->r_bushandle->bsh_iat[i] = start;
  215         }
  216 
  217         re->r_bushandle->bsh_iatsz = count;
  218         re->r_bushandle->bsh_bam = re->r_bustag->bs_ra; /* relocate access */
  219 
  220         return 0;
  221 }
  222 #endif  /* PC98 */
  223 
  224 int
  225 isa_release_resource(device_t bus, device_t child, int type, int rid,
  226                      struct resource *r)
  227 {
  228         struct isa_device* idev = DEVTOISA(child);
  229         struct resource_list *rl = &idev->id_resources;
  230 #ifdef PC98
  231         /*
  232          * Indirection support.  The type of bus_space_handle_t is
  233          * defined in sys/i386/include/bus_pc98.h.
  234          */
  235         int     i;
  236 
  237         if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
  238                 for (i = 1; i < r->r_bushandle->bsh_ressz; i++)
  239                         resource_list_release(rl, bus, child, type, rid + i,
  240                                               r->r_bushandle->bsh_res[i]);
  241                 if (r->r_bushandle->bsh_res != NULL)
  242                         free(r->r_bushandle->bsh_res, M_DEVBUF);
  243         }
  244 #endif
  245         return resource_list_release(rl, bus, child, type, rid, r);
  246 }
  247 
  248 /*
  249  * We can't use the bus_generic_* versions of these methods because those
  250  * methods always pass the bus param as the requesting device, and we need
  251  * to pass the child (the i386 nexus knows about this and is prepared to
  252  * deal).
  253  */
  254 int
  255 isa_setup_intr(device_t bus, device_t child, struct resource *r, int flags,
  256                void (*ihand)(void *), void *arg, void **cookiep)
  257 {
  258         return (BUS_SETUP_INTR(device_get_parent(bus), child, r, flags,
  259                                ihand, arg, cookiep));
  260 }
  261 
  262 int
  263 isa_teardown_intr(device_t bus, device_t child, struct resource *r,
  264                   void *cookie)
  265 {
  266         return (BUS_TEARDOWN_INTR(device_get_parent(bus), child, r, cookie));
  267 }
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FreeBSD/Linux Kernel Cross Reference sys/i386/isa/isa.c

FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/isa.c
