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/isa/orm.c

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    1 /*-
    2  * Copyright (c) 2000 Nikolai Saoukh
    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: src/sys/isa/orm.c,v 1.1.2.1 2001/06/19 05:48:29 imp Exp $
   27  */
   28 
   29 /*
   30  * Driver to take care of holes in ISA I/O memory occupied
   31  * by option rom(s)
   32  */
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/kernel.h>
   37 #include <sys/socket.h>
   38 
   39 #include <sys/module.h>
   40 #include <sys/bus.h>
   41 
   42 #include <machine/bus.h>
   43 #include <machine/resource.h>
   44 #include <sys/rman.h>
   45 
   46 #include <isa/isavar.h>
   47 #include <isa/pnpvar.h>
   48 
   49 #define IOMEM_START     0x0a0000
   50 #define IOMEM_STEP      0x000800
   51 #define IOMEM_END       0x100000
   52 
   53 #define ORM_ID  0x00004d3e
   54 
   55 static struct isa_pnp_id orm_ids[] = {
   56         { ORM_ID,       NULL },         /* ORM0000 */
   57         { 0,            NULL },
   58 };
   59 
   60 #define MAX_ROMS        16
   61 
   62 struct orm_softc {
   63         int             rnum;
   64         int             rid[MAX_ROMS];
   65         struct resource *res[MAX_ROMS];
   66 };
   67 
   68 static int
   69 orm_probe(device_t dev)
   70 {
   71         return (ISA_PNP_PROBE(device_get_parent(dev), dev, orm_ids));
   72 }
   73 
   74 static int
   75 orm_attach(device_t dev)
   76 {
   77         return (0);
   78 }
   79 
   80 static void
   81 orm_identify(driver_t* driver, device_t parent)
   82 {
   83         bus_space_handle_t      bh;
   84         bus_space_tag_t         bt;
   85         device_t                child;
   86         u_int32_t               chunk = IOMEM_START;
   87         struct resource         *res;
   88         int                     rid;
   89         u_int32_t               rom_size;
   90         struct orm_softc        *sc;
   91         u_int8_t                buf[3];
   92 
   93         child = BUS_ADD_CHILD(parent, ISA_ORDER_SENSITIVE, "orm", -1);
   94         device_set_driver(child, driver);
   95         isa_set_logicalid(child, ORM_ID);
   96         isa_set_vendorid(child, ORM_ID);
   97         sc = device_get_softc(child);
   98         sc->rnum = 0;
   99         while (chunk < IOMEM_END) {
  100                 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
  101                     IOMEM_STEP);
  102                 rid = sc->rnum;
  103                 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul, 
  104                     ~0ul, IOMEM_STEP, RF_ACTIVE);
  105                 if (res == NULL) {
  106                         bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
  107                         chunk += IOMEM_STEP;
  108                         continue;
  109                 }
  110                 bt = rman_get_bustag(res);
  111                 bh = rman_get_bushandle(res);
  112                 bus_space_read_region_1(bt, bh, 0, buf, sizeof(buf));
  113 
  114                 /*
  115                  * We need to release and delete the resource since we're
  116                  * changing its size, or the rom isn't there.  There
  117                  * is a checksum field in the ROM to prevent false
  118                  * positives.  However, some common hardware (IBM thinkpads)
  119                  * neglects to put a valid checksum in the ROM, so we do
  120                  * not double check the checksum here.  On the ISA bus
  121                  * areas that have no hardware read back as 0xff, so the
  122                  * tests to see if we have 0x55 followed by 0xaa are
  123                  * generally sufficient.
  124                  */
  125                 bus_release_resource(child, SYS_RES_MEMORY, rid, res);
  126                 bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
  127                 if (buf[0] != 0x55 || buf[1] != 0xAA || (buf[2] & 0x03) != 0) {
  128                         chunk += IOMEM_STEP;
  129                         continue;
  130                 }
  131                 rom_size = buf[2] << 9;
  132                 bus_set_resource(child, SYS_RES_MEMORY, sc->rnum, chunk,
  133                     rom_size);
  134                 rid = sc->rnum;
  135                 res = bus_alloc_resource(child, SYS_RES_MEMORY, &rid, 0ul,
  136                     ~0ul, rom_size, 0);
  137                 if (res == NULL) {
  138                         bus_delete_resource(child, SYS_RES_MEMORY, sc->rnum);
  139                         chunk += IOMEM_STEP;
  140                         continue;
  141                 }
  142                 sc->rid[sc->rnum] = rid;
  143                 sc->res[sc->rnum] = res;
  144                 sc->rnum++;
  145                 chunk += rom_size;
  146         }
  147 
  148         if (sc->rnum == 0)
  149                 device_delete_child(parent, child);
  150         else if (sc->rnum == 1)
  151                 device_set_desc(child, "Option ROM");
  152         else
  153                 device_set_desc(child, "Option ROMs");
  154 }
  155 
  156 static int
  157 orm_detach(device_t dev)
  158 {
  159         int                     i;
  160         struct orm_softc        *sc = device_get_softc(dev);
  161         
  162         for (i = 0; i < sc->rnum; i++)
  163                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid[i],
  164                     sc->res[i]);
  165         return (0);
  166 }
  167 
  168 static device_method_t orm_methods[] = {
  169         /* Device interface */
  170         DEVMETHOD(device_identify,      orm_identify),
  171         DEVMETHOD(device_probe,         orm_probe),
  172         DEVMETHOD(device_attach,        orm_attach),
  173         DEVMETHOD(device_detach,        orm_detach),
  174         { 0, 0 }
  175 };
  176 
  177 static driver_t orm_driver = {
  178         "orm",
  179         orm_methods,
  180         sizeof (struct orm_softc)
  181 };
  182 
  183 static devclass_t orm_devclass;
  184 
  185 DRIVER_MODULE(orm, isa, orm_driver, orm_devclass, 0, 0);

Cache object: f331e3aeb668865b6988fe641da2adb1


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