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/amd64/amd64/legacy.c

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    1 /*-
    2  * Copyright 1998 Massachusetts Institute of Technology
    3  *
    4  * Permission to use, copy, modify, and distribute this software and
    5  * its documentation for any purpose and without fee is hereby
    6  * granted, provided that both the above copyright notice and this
    7  * permission notice appear in all copies, that both the above
    8  * copyright notice and this permission notice appear in all
    9  * supporting documentation, and that the name of M.I.T. not be used
   10  * in advertising or publicity pertaining to distribution of the
   11  * software without specific, written prior permission.  M.I.T. makes
   12  * no representations about the suitability of this software for any
   13  * purpose.  It is provided "as is" without express or implied
   14  * warranty.
   15  * 
   16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
   17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
   18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
   20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
   23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  */
   29 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD: releng/5.2/sys/amd64/amd64/legacy.c 122940 2003-11-21 03:02:00Z peter $");
   32 
   33 /*
   34  * This code implements a system driver for legacy systems that do not
   35  * support ACPI or when ACPI support is not present in the kernel.
   36  */
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/bus.h>
   41 #include <sys/kernel.h>
   42 #include <sys/malloc.h>
   43 #include <machine/bus.h>
   44 #include <sys/rman.h>
   45 
   46 #include <machine/legacyvar.h>
   47 #include <machine/resource.h>
   48 
   49 static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
   50 struct legacy_device {
   51         struct resource_list    lg_resources;
   52         int                     lg_pcibus;
   53 };
   54 
   55 #define DEVTOAT(dev)    ((struct legacy_device *)device_get_ivars(dev))
   56 
   57 static void legacy_identify(driver_t *driver, device_t parent);
   58 static  int legacy_probe(device_t);
   59 static  int legacy_attach(device_t);
   60 static  int legacy_print_child(device_t, device_t);
   61 static device_t legacy_add_child(device_t bus, int order, const char *name,
   62                                 int unit);
   63 static  struct resource *legacy_alloc_resource(device_t, device_t, int, int *,
   64                                               u_long, u_long, u_long, u_int);
   65 static  int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
   66 static  int legacy_write_ivar(device_t, device_t, int, uintptr_t);
   67 static  int legacy_release_resource(device_t, device_t, int, int,
   68                                    struct resource *);
   69 static  int legacy_set_resource(device_t, device_t, int, int, u_long, u_long);
   70 static  int legacy_get_resource(device_t, device_t, int, int, u_long *, u_long *);
   71 static void legacy_delete_resource(device_t, device_t, int, int);
   72 
   73 static device_method_t legacy_methods[] = {
   74         /* Device interface */
   75         DEVMETHOD(device_identify,      legacy_identify),
   76         DEVMETHOD(device_probe,         legacy_probe),
   77         DEVMETHOD(device_attach,        legacy_attach),
   78         DEVMETHOD(device_detach,        bus_generic_detach),
   79         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
   80         DEVMETHOD(device_suspend,       bus_generic_suspend),
   81         DEVMETHOD(device_resume,        bus_generic_resume),
   82 
   83         /* Bus interface */
   84         DEVMETHOD(bus_print_child,      legacy_print_child),
   85         DEVMETHOD(bus_add_child,        legacy_add_child),
   86         DEVMETHOD(bus_read_ivar,        legacy_read_ivar),
   87         DEVMETHOD(bus_write_ivar,       legacy_write_ivar),
   88         DEVMETHOD(bus_set_resource,     legacy_set_resource),
   89         DEVMETHOD(bus_get_resource,     legacy_get_resource),
   90         DEVMETHOD(bus_alloc_resource,   legacy_alloc_resource),
   91         DEVMETHOD(bus_release_resource, legacy_release_resource),
   92         DEVMETHOD(bus_delete_resource,  legacy_delete_resource),
   93         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
   94         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
   95         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
   96         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   97 
   98         { 0, 0 }
   99 };
  100 
  101 static driver_t legacy_driver = {
  102         "legacy",
  103         legacy_methods,
  104         1,                      /* no softc */
  105 };
  106 static devclass_t legacy_devclass;
  107 
  108 DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
  109 
  110 static void
  111 legacy_identify(driver_t *driver, device_t parent)
  112 {
  113 
  114         /*
  115          * Add child device with order of 1 so it gets probed
  116          * after ACPI (which is at order 0.
  117          */
  118         if (BUS_ADD_CHILD(parent, 1, "legacy", 0) == NULL)
  119                 panic("legacy: could not attach");
  120 }
  121 
  122 static int
  123 legacy_probe(device_t dev)
  124 {
  125         device_t acpi;
  126 
  127         /*
  128          * Fail to probe if ACPI is ok.
  129          */
  130         acpi = devclass_get_device(devclass_find("acpi"), 0);
  131         if (acpi != NULL && device_is_alive(acpi))
  132                 return (ENXIO);
  133         device_set_desc(dev, "legacy system");
  134         device_quiet(dev);
  135         return (0);
  136 }
  137 
  138 static int
  139 legacy_attach(device_t dev)
  140 {
  141         device_t        child;
  142 
  143         /*
  144          * First, let our child driver's identify any child devices that
  145          * they can find.  Once that is done attach any devices that we
  146          * found.
  147          */
  148         bus_generic_probe(dev);
  149         bus_generic_attach(dev);
  150 
  151         /*
  152          * If we didn't see ISA on a pci bridge, create some
  153          * connection points now so it shows up "on motherboard".
  154          */
  155         if (!devclass_get_device(devclass_find("isa"), 0)) {
  156                 child = BUS_ADD_CHILD(dev, 0, "isa", 0);
  157                 if (child == NULL)
  158                         panic("legacy_attach isa");
  159                 device_probe_and_attach(child);
  160         }
  161 
  162         return 0;
  163 }
  164 
  165 static int
  166 legacy_print_all_resources(device_t dev)
  167 {
  168         struct legacy_device *atdev = DEVTOAT(dev);
  169         struct resource_list *rl = &atdev->lg_resources;
  170         int retval = 0;
  171 
  172         if (SLIST_FIRST(rl) || atdev->lg_pcibus != -1)
  173                 retval += printf(" at");
  174         
  175         retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
  176         retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
  177         retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
  178 
  179         return retval;
  180 }
  181 
  182 static int
  183 legacy_print_child(device_t bus, device_t child)
  184 {
  185         struct legacy_device *atdev = DEVTOAT(child);
  186         int retval = 0;
  187 
  188         retval += bus_print_child_header(bus, child);
  189         retval += legacy_print_all_resources(child);
  190         if (atdev->lg_pcibus != -1)
  191                 retval += printf(" pcibus %d", atdev->lg_pcibus);
  192         retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
  193 
  194         return (retval);
  195 }
  196 
  197 static device_t
  198 legacy_add_child(device_t bus, int order, const char *name, int unit)
  199 {
  200         device_t child;
  201         struct legacy_device *atdev;
  202 
  203         atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
  204             M_NOWAIT | M_ZERO);
  205         if (!atdev)
  206                 return(0);
  207         resource_list_init(&atdev->lg_resources);
  208         atdev->lg_pcibus = -1;
  209 
  210         child = device_add_child_ordered(bus, order, name, unit); 
  211 
  212         /* should we free this in legacy_child_detached? */
  213         device_set_ivars(child, atdev);
  214 
  215         return(child);
  216 }
  217 
  218 static int
  219 legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  220 {
  221         struct legacy_device *atdev = DEVTOAT(child);
  222 
  223         switch (which) {
  224         case LEGACY_IVAR_PCIBUS:
  225                 *result = atdev->lg_pcibus;
  226                 break;
  227         default:
  228                 return ENOENT;
  229         }
  230         return 0;
  231 }
  232         
  233 
  234 static int
  235 legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  236 {
  237         struct legacy_device *atdev = DEVTOAT(child);
  238 
  239         switch (which) {
  240         case LEGACY_IVAR_PCIBUS:
  241                 atdev->lg_pcibus = value;
  242                 break;
  243         default:
  244                 return ENOENT;
  245         }
  246         return 0;
  247 }
  248 
  249 
  250 static struct resource *
  251 legacy_alloc_resource(device_t bus, device_t child, int type, int *rid,
  252                      u_long start, u_long end, u_long count, u_int flags)
  253 {
  254         struct legacy_device *atdev = DEVTOAT(child);
  255         struct resource_list *rl = &atdev->lg_resources;
  256 
  257         return (resource_list_alloc(rl, bus, child, type, rid, start, end,
  258                     count, flags));
  259 }
  260 
  261 static int
  262 legacy_release_resource(device_t bus, device_t child, int type, int rid,
  263                        struct resource *r)
  264 {
  265         struct legacy_device *atdev = DEVTOAT(child);
  266         struct resource_list *rl = &atdev->lg_resources;
  267 
  268         return (resource_list_release(rl, bus, child, type, rid, r));
  269 }
  270 
  271 static int
  272 legacy_set_resource(device_t dev, device_t child, int type, int rid,
  273     u_long start, u_long count)
  274 {
  275         struct legacy_device *atdev = DEVTOAT(child);
  276         struct resource_list *rl = &atdev->lg_resources;
  277 
  278         resource_list_add(rl, type, rid, start, start + count - 1, count);
  279         return(0);
  280 }
  281 
  282 static int
  283 legacy_get_resource(device_t dev, device_t child, int type, int rid,
  284     u_long *startp, u_long *countp)
  285 {
  286         struct legacy_device *atdev = DEVTOAT(child);
  287         struct resource_list *rl = &atdev->lg_resources;
  288         struct resource_list_entry *rle;
  289 
  290         rle = resource_list_find(rl, type, rid);
  291         if (!rle)
  292                 return(ENOENT);
  293         if (startp)
  294                 *startp = rle->start;
  295         if (countp)
  296                 *countp = rle->count;
  297         return(0);
  298 }
  299 
  300 static void
  301 legacy_delete_resource(device_t dev, device_t child, int type, int rid)
  302 {
  303         struct legacy_device *atdev = DEVTOAT(child);
  304         struct resource_list *rl = &atdev->lg_resources;
  305 
  306         resource_list_delete(rl, type, rid);
  307 }

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