FreeBSD/Linux Kernel Cross Reference
sys/dev/pci/hostb_pci.c

     /*
      * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR 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/11.2/sys/dev/pci/hostb_pci.c 331722 2018-03-29 02:50:57Z eadler $");
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    
    #include <dev/pci/pcivar.h>
    #include <dev/pci/pcireg.h>
    
    /*
     * Provide a device to "eat" the host->pci bridge devices that show up
     * on PCI busses and stop them showing up twice on the probes.  This also
     * stops them showing up as 'none' in pciconf -l.  If the host bridge
     * provides an AGP capability then we create a child agp device for the
     * agp GART driver to attach to.
     */
    static int
    pci_hostb_probe(device_t dev)
    {
            u_int32_t id;
    
            id = pci_get_devid(dev);
    
            switch (id) {
    
            /* VIA VT82C596 Power Management Function */
            case 0x30501106:
                    return (ENXIO);
    
            default:
                    break;
            }
    
            if (pci_get_class(dev) == PCIC_BRIDGE &&
                pci_get_subclass(dev) == PCIS_BRIDGE_HOST) {
                    device_set_desc(dev, "Host to PCI bridge");
                    device_quiet(dev);
                    return (-10000);
            }
            return (ENXIO);
    }
    
    static int
    pci_hostb_attach(device_t dev)
    {
    
            bus_generic_probe(dev);
    
            /*
             * If AGP capabilities are present on this device, then create
             * an AGP child.
             */
            if (pci_find_cap(dev, PCIY_AGP, NULL) == 0)
                    device_add_child(dev, "agp", -1);
            bus_generic_attach(dev);
            return (0);
    }
    
    /* Bus interface. */
    
    static int
    pci_hostb_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
    {
    
            return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
    }
    
    static int
    pci_hostb_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
    {
    
           return (EINVAL);
   }
   
   static struct resource *
   pci_hostb_alloc_resource(device_t dev, device_t child, int type, int *rid,
       rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
   {
   
           return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
   }
   
   static int
   pci_hostb_release_resource(device_t dev, device_t child, int type, int rid,
       struct resource *r)
   {
   
           return (bus_release_resource(dev, type, rid, r));
   }
   
   /* PCI interface. */
   
   static uint32_t
   pci_hostb_read_config(device_t dev, device_t child, int reg, int width)
   {
   
           return (pci_read_config(dev, reg, width));
   }
   
   static void
   pci_hostb_write_config(device_t dev, device_t child, int reg, 
       uint32_t val, int width)
   {
   
           pci_write_config(dev, reg, val, width);
   }
   
   static int
   pci_hostb_enable_busmaster(device_t dev, device_t child)
   {
   
           device_printf(dev, "child %s requested pci_enable_busmaster\n",
               device_get_nameunit(child));
           return (pci_enable_busmaster(dev));
   }
   
   static int
   pci_hostb_disable_busmaster(device_t dev, device_t child)
   {
   
           device_printf(dev, "child %s requested pci_disable_busmaster\n",
               device_get_nameunit(child));
           return (pci_disable_busmaster(dev));
   }
   
   static int
   pci_hostb_enable_io(device_t dev, device_t child, int space)
   {
   
           device_printf(dev, "child %s requested pci_enable_io\n",
               device_get_nameunit(child));
           return (pci_enable_io(dev, space));
   }
   
   static int
   pci_hostb_disable_io(device_t dev, device_t child, int space)
   {
   
           device_printf(dev, "child %s requested pci_disable_io\n",
               device_get_nameunit(child));
           return (pci_disable_io(dev, space));
   }
   
   static int
   pci_hostb_set_powerstate(device_t dev, device_t child, int state)
   {
   
           device_printf(dev, "child %s requested pci_set_powerstate\n",
               device_get_nameunit(child));
           return (pci_set_powerstate(dev, state));
   }
   
   static int
   pci_hostb_get_powerstate(device_t dev, device_t child)
   {
   
           device_printf(dev, "child %s requested pci_get_powerstate\n",
               device_get_nameunit(child));
           return (pci_get_powerstate(dev));
   }
   
   static int
   pci_hostb_assign_interrupt(device_t dev, device_t child)
   {
   
           device_printf(dev, "child %s requested pci_assign_interrupt\n",
               device_get_nameunit(child));
           return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
   }
   
   static int
   pci_hostb_find_cap(device_t dev, device_t child, int capability,
       int *capreg)
   {
   
           return (pci_find_cap(dev, capability, capreg));
   }
   
   static int
   pci_hostb_find_next_cap(device_t dev, device_t child, int capability,
       int start, int *capreg)
   {
   
           return (pci_find_next_cap(dev, capability, start, capreg));
   }
   
   static int
   pci_hostb_find_extcap(device_t dev, device_t child, int capability,
       int *capreg)
   {
   
           return (pci_find_extcap(dev, capability, capreg));
   }
   
   static int
   pci_hostb_find_next_extcap(device_t dev, device_t child, int capability,
       int start, int *capreg)
   {
   
           return (pci_find_next_extcap(dev, capability, start, capreg));
   }
   
   static int
   pci_hostb_find_htcap(device_t dev, device_t child, int capability,
       int *capreg)
   {
   
           return (pci_find_htcap(dev, capability, capreg));
   }
   
   static int
   pci_hostb_find_next_htcap(device_t dev, device_t child, int capability,
       int start, int *capreg)
   {
   
           return (pci_find_next_htcap(dev, capability, start, capreg));
   }
   
   static device_method_t pci_hostb_methods[] = {
           /* Device interface */
           DEVMETHOD(device_probe,         pci_hostb_probe),
           DEVMETHOD(device_attach,        pci_hostb_attach),
           DEVMETHOD(device_shutdown,      bus_generic_shutdown),
           DEVMETHOD(device_suspend,       bus_generic_suspend),
           DEVMETHOD(device_resume,        bus_generic_resume),
   
           /* Bus interface */
           DEVMETHOD(bus_read_ivar,        pci_hostb_read_ivar),
           DEVMETHOD(bus_write_ivar,       pci_hostb_write_ivar),
           DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
           DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
   
           DEVMETHOD(bus_alloc_resource,   pci_hostb_alloc_resource),
           DEVMETHOD(bus_release_resource, pci_hostb_release_resource),
           DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
           DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
   
           /* PCI interface */
           DEVMETHOD(pci_read_config,      pci_hostb_read_config),
           DEVMETHOD(pci_write_config,     pci_hostb_write_config),
           DEVMETHOD(pci_enable_busmaster, pci_hostb_enable_busmaster),
           DEVMETHOD(pci_disable_busmaster, pci_hostb_disable_busmaster),
           DEVMETHOD(pci_enable_io,        pci_hostb_enable_io),
           DEVMETHOD(pci_disable_io,       pci_hostb_disable_io),
           DEVMETHOD(pci_get_powerstate,   pci_hostb_get_powerstate),
           DEVMETHOD(pci_set_powerstate,   pci_hostb_set_powerstate),
           DEVMETHOD(pci_assign_interrupt, pci_hostb_assign_interrupt),
           DEVMETHOD(pci_find_cap,         pci_hostb_find_cap),
           DEVMETHOD(pci_find_next_cap,    pci_hostb_find_next_cap),
           DEVMETHOD(pci_find_extcap,      pci_hostb_find_extcap),
           DEVMETHOD(pci_find_next_extcap, pci_hostb_find_next_extcap),
           DEVMETHOD(pci_find_htcap,       pci_hostb_find_htcap),
           DEVMETHOD(pci_find_next_htcap,  pci_hostb_find_next_htcap),
   
           { 0, 0 }
   };
   
   static driver_t pci_hostb_driver = {
           "hostb",
           pci_hostb_methods,
           1,
   };
   
   static devclass_t pci_hostb_devclass;
   
   DRIVER_MODULE(hostb, pci, pci_hostb_driver, pci_hostb_devclass, 0, 0);

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