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

     /*-
      * Copyright 1998 Massachusetts Institute of Technology
      *
      * Permission to use, copy, modify, and distribute this software and
      * its documentation for any purpose and without fee is hereby
      * granted, provided that both the above copyright notice and this
      * permission notice appear in all copies, that both the above
      * copyright notice and this permission notice appear in all
      * supporting documentation, and that the name of M.I.T. not be used
     * in advertising or publicity pertaining to distribution of the
     * software without specific, written prior permission.  M.I.T. makes
     * no representations about the suitability of this software for any
     * purpose.  It is provided "as is" without express or implied
     * warranty.
     * 
     * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
     * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
     * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
     * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
     * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/5.2/sys/i386/i386/legacy.c 119452 2003-08-25 09:48:48Z obrien $");
    
    /*
     * This code implements a system driver for legacy systems that do not
     * support ACPI or when ACPI support is not present in the kernel.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <machine/bus.h>
    #include <sys/rman.h>
    
    #include "opt_mca.h"
    #ifdef DEV_MCA
    #include <i386/bios/mca_machdep.h>
    #endif
    
    #include <machine/legacyvar.h>
    #include <machine/resource.h>
    
    static MALLOC_DEFINE(M_LEGACYDEV, "legacydrv", "legacy system device");
    struct legacy_device {
            struct resource_list    lg_resources;
            int                     lg_pcibus;
    };
    
    #define DEVTOAT(dev)    ((struct legacy_device *)device_get_ivars(dev))
    
    static void legacy_identify(driver_t *driver, device_t parent);
    static  int legacy_probe(device_t);
    static  int legacy_attach(device_t);
    static  int legacy_print_child(device_t, device_t);
    static device_t legacy_add_child(device_t bus, int order, const char *name,
                                    int unit);
    static  struct resource *legacy_alloc_resource(device_t, device_t, int, int *,
                                                  u_long, u_long, u_long, u_int);
    static  int legacy_read_ivar(device_t, device_t, int, uintptr_t *);
    static  int legacy_write_ivar(device_t, device_t, int, uintptr_t);
    static  int legacy_release_resource(device_t, device_t, int, int,
                                       struct resource *);
    static  int legacy_set_resource(device_t, device_t, int, int, u_long, u_long);
    static  int legacy_get_resource(device_t, device_t, int, int, u_long *, u_long *);
    static void legacy_delete_resource(device_t, device_t, int, int);
    
    static device_method_t legacy_methods[] = {
            /* Device interface */
            DEVMETHOD(device_identify,      legacy_identify),
            DEVMETHOD(device_probe,         legacy_probe),
            DEVMETHOD(device_attach,        legacy_attach),
            DEVMETHOD(device_detach,        bus_generic_detach),
            DEVMETHOD(device_shutdown,      bus_generic_shutdown),
            DEVMETHOD(device_suspend,       bus_generic_suspend),
            DEVMETHOD(device_resume,        bus_generic_resume),
    
            /* Bus interface */
            DEVMETHOD(bus_print_child,      legacy_print_child),
            DEVMETHOD(bus_add_child,        legacy_add_child),
            DEVMETHOD(bus_read_ivar,        legacy_read_ivar),
            DEVMETHOD(bus_write_ivar,       legacy_write_ivar),
            DEVMETHOD(bus_set_resource,     legacy_set_resource),
            DEVMETHOD(bus_get_resource,     legacy_get_resource),
            DEVMETHOD(bus_alloc_resource,   legacy_alloc_resource),
            DEVMETHOD(bus_release_resource, legacy_release_resource),
            DEVMETHOD(bus_delete_resource,  legacy_delete_resource),
            DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
            DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
           DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
           DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   
           { 0, 0 }
   };
   
   static driver_t legacy_driver = {
           "legacy",
           legacy_methods,
           1,                      /* no softc */
   };
   static devclass_t legacy_devclass;
   
   DRIVER_MODULE(legacy, nexus, legacy_driver, legacy_devclass, 0, 0);
   
   static void
   legacy_identify(driver_t *driver, device_t parent)
   {
   
           /*
            * Add child device with order of 1 so it gets probed
            * after ACPI (which is at order 0.
            */
           if (BUS_ADD_CHILD(parent, 1, "legacy", 0) == NULL)
                   panic("legacy: could not attach");
   }
   
   static int
   legacy_probe(device_t dev)
   {
           device_t acpi;
   
           /*
            * Fail to probe if ACPI is ok.
            */
           acpi = devclass_get_device(devclass_find("acpi"), 0);
           if (acpi != NULL && device_is_alive(acpi))
                   return (ENXIO);
           device_set_desc(dev, "legacy system");
           device_quiet(dev);
           return (0);
   }
   
   static int
   legacy_attach(device_t dev)
   {
           device_t        child;
   
           /*
            * First, let our child driver's identify any child devices that
            * they can find.  Once that is done attach any devices that we
            * found.
            */
           bus_generic_probe(dev);
           bus_generic_attach(dev);
   
           /*
            * If we didn't see EISA or ISA on a pci bridge, create some
            * connection points now so they show up "on motherboard".
            */
           if (!devclass_get_device(devclass_find("eisa"), 0)) {
                   child = BUS_ADD_CHILD(dev, 0, "eisa", 0);
                   if (child == NULL)
                           panic("legacy_attach eisa");
                   device_probe_and_attach(child);
           }
   #ifdef DEV_MCA
           if (MCA_system && !devclass_get_device(devclass_find("mca"), 0)) {
                   child = BUS_ADD_CHILD(dev, 0, "mca", 0);
                   if (child == 0)
                           panic("legacy_probe mca");
                   device_probe_and_attach(child);
           }
   #endif
           if (!devclass_get_device(devclass_find("isa"), 0)) {
                   child = BUS_ADD_CHILD(dev, 0, "isa", 0);
                   if (child == NULL)
                           panic("legacy_attach isa");
                   device_probe_and_attach(child);
           }
   
           return 0;
   }
   
   static int
   legacy_print_all_resources(device_t dev)
   {
           struct legacy_device *atdev = DEVTOAT(dev);
           struct resource_list *rl = &atdev->lg_resources;
           int retval = 0;
   
           if (SLIST_FIRST(rl) || atdev->lg_pcibus != -1)
                   retval += printf(" at");
           
           retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx");
           retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx");
           retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld");
   
           return retval;
   }
   
   static int
   legacy_print_child(device_t bus, device_t child)
   {
           struct legacy_device *atdev = DEVTOAT(child);
           int retval = 0;
   
           retval += bus_print_child_header(bus, child);
           retval += legacy_print_all_resources(child);
           if (atdev->lg_pcibus != -1)
                   retval += printf(" pcibus %d", atdev->lg_pcibus);
           retval += printf(" on motherboard\n");  /* XXX "motherboard", ick */
   
           return (retval);
   }
   
   static device_t
   legacy_add_child(device_t bus, int order, const char *name, int unit)
   {
           device_t child;
           struct legacy_device *atdev;
   
           atdev = malloc(sizeof(struct legacy_device), M_LEGACYDEV,
               M_NOWAIT | M_ZERO);
           if (!atdev)
                   return(0);
           resource_list_init(&atdev->lg_resources);
           atdev->lg_pcibus = -1;
   
           child = device_add_child_ordered(bus, order, name, unit); 
   
           /* should we free this in legacy_child_detached? */
           device_set_ivars(child, atdev);
   
           return(child);
   }
   
   static int
   legacy_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
   {
           struct legacy_device *atdev = DEVTOAT(child);
   
           switch (which) {
           case LEGACY_IVAR_PCIBUS:
                   *result = atdev->lg_pcibus;
                   break;
           default:
                   return ENOENT;
           }
           return 0;
   }
           
   
   static int
   legacy_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
   {
           struct legacy_device *atdev = DEVTOAT(child);
   
           switch (which) {
           case LEGACY_IVAR_PCIBUS:
                   atdev->lg_pcibus = value;
                   break;
           default:
                   return ENOENT;
           }
           return 0;
   }
   
   
   static struct resource *
   legacy_alloc_resource(device_t bus, device_t child, int type, int *rid,
                        u_long start, u_long end, u_long count, u_int flags)
   {
           struct legacy_device *atdev = DEVTOAT(child);
           struct resource_list *rl = &atdev->lg_resources;
   
           return (resource_list_alloc(rl, bus, child, type, rid, start, end,
                       count, flags));
   }
   
   static int
   legacy_release_resource(device_t bus, device_t child, int type, int rid,
                          struct resource *r)
   {
           struct legacy_device *atdev = DEVTOAT(child);
           struct resource_list *rl = &atdev->lg_resources;
   
           return (resource_list_release(rl, bus, child, type, rid, r));
   }
   
   static int
   legacy_set_resource(device_t dev, device_t child, int type, int rid,
       u_long start, u_long count)
   {
           struct legacy_device *atdev = DEVTOAT(child);
           struct resource_list *rl = &atdev->lg_resources;
   
           resource_list_add(rl, type, rid, start, start + count - 1, count);
           return(0);
   }
   
   static int
   legacy_get_resource(device_t dev, device_t child, int type, int rid,
       u_long *startp, u_long *countp)
   {
           struct legacy_device *atdev = DEVTOAT(child);
           struct resource_list *rl = &atdev->lg_resources;
           struct resource_list_entry *rle;
   
           rle = resource_list_find(rl, type, rid);
           if (!rle)
                   return(ENOENT);
           if (startp)
                   *startp = rle->start;
           if (countp)
                   *countp = rle->count;
           return(0);
   }
   
   static void
   legacy_delete_resource(device_t dev, device_t child, int type, int rid)
   {
           struct legacy_device *atdev = DEVTOAT(child);
           struct resource_list *rl = &atdev->lg_resources;
   
           resource_list_delete(rl, type, rid);
   }

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