sys/bus/pci/hostb_pci.c

   1 /*
   2  * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
   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 unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/dev/pci/hostb_pci.c,v 1.1.8.1 2009/04/15 03:14:26 kensmith Exp $
  27  */
  28
  29 #include <sys/param.h>
  30 #include <sys/bus.h>
  31 #include <sys/kernel.h>
  32 #include <sys/module.h>
  33
  34 #include <sys/types.h>
  35 #include <sys/systm.h>
  36
  37 #include <bus/pci/pcivar.h>
  38 #include <bus/pci/pcireg.h>
  39
  40 /*
  41  * Provide a device to "eat" the host->pci bridge devices that show up
  42  * on PCI busses and stop them showing up twice on the probes.  This also
  43  * stops them showing up as 'none' in pciconf -l.  If the host bridge
  44  * provides an AGP capability then we create a child agp device for the
  45  * agp GART driver to attach to.
  46  */
  47 static int
  48 pci_hostb_probe(device_t dev)
  49 {
  50         u_int32_t id;
  51         id = pci_get_devid(dev);
  52
  53         switch (id) {
  54
  55         /* VIA VT82C596 Power Managment Function */
  56         case 0x30501106:
  57                 return (ENXIO);
  58
  59         default:
  60                 break;
  61         }
  62
  63         if (pci_get_class(dev) == PCIC_BRIDGE &&
  64             pci_get_subclass(dev) == PCIS_BRIDGE_HOST) {
  65                 device_set_desc(dev, "Host to PCI bridge");
  66                 device_quiet(dev);
  67                 return (-10000);
  68         }
  69         return (ENXIO);
  70 }
  71
  72 static int
  73 pci_hostb_attach(device_t dev)
  74 {
  75
  76         bus_generic_probe(dev);
  77
  78         /*
  79          * If AGP capabilities are present on this device, then create
  80          * an AGP child.
  81          */
  82         if (pci_find_extcap(dev, PCIY_AGP, NULL) == 0)
  83                 device_add_child(dev, "agp", -1);
  84         bus_generic_attach(dev);
  85         return (0);
  86 }
  87
  88 /* Bus interface. */
  89
  90 static int
  91 pci_hostb_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
  92 {
  93
  94         return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result));
  95 }
  96
  97 static int
  98 pci_hostb_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
  99 {
 100
 101         return (EINVAL);
 102 }
 103
 104 static struct resource *
 105 pci_hostb_alloc_resource(device_t dev, device_t child, int type, int *rid,
 106     u_long start, u_long end, u_long count, u_int flags)
 107 {
 108
 109         return (bus_alloc_resource(dev, type, rid, start, end, count, flags));
 110 }
 111
 112 static int
 113 pci_hostb_release_resource(device_t dev, device_t child, int type, int rid,
 114     struct resource *r)
 115 {
 116
 117         return (bus_release_resource(dev, type, rid, r));
 118 }
 119
 120 /* PCI interface. */
 121
 122 static uint32_t
 123 pci_hostb_read_config(device_t dev, device_t child, int reg, int width)
 124 {
 125
 126         return (pci_read_config(dev, reg, width));
 127 }
 128
 129 static void
 130 pci_hostb_write_config(device_t dev, device_t child, int reg,
 131     uint32_t val, int width)
 132 {
 133
 134         pci_write_config(dev, reg, val, width);
 135 }
 136
 137 static int
 138 pci_hostb_enable_busmaster(device_t dev, device_t child)
 139 {
 140
 141         device_printf(dev, "child %s requested pci_enable_busmaster\n",
 142             device_get_nameunit(child));
 143         return (pci_enable_busmaster(dev));
 144 }
 145
 146 static int
 147 pci_hostb_disable_busmaster(device_t dev, device_t child)
 148 {
 149
 150         device_printf(dev, "child %s requested pci_disable_busmaster\n",
 151             device_get_nameunit(child));
 152         return (pci_disable_busmaster(dev));
 153 }
 154
 155 static int
 156 pci_hostb_enable_io(device_t dev, device_t child, int space)
 157 {
 158
 159         device_printf(dev, "child %s requested pci_enable_io\n",
 160             device_get_nameunit(child));
 161         return (pci_enable_io(dev, space));
 162 }
 163
 164 static int
 165 pci_hostb_disable_io(device_t dev, device_t child, int space)
 166 {
 167
 168         device_printf(dev, "child %s requested pci_disable_io\n",
 169             device_get_nameunit(child));
 170         return (pci_disable_io(dev, space));
 171 }
 172
 173 static int
 174 pci_hostb_set_powerstate(device_t dev, device_t child, int state)
 175 {
 176
 177         device_printf(dev, "child %s requested pci_set_powerstate\n",
 178             device_get_nameunit(child));
 179         return (pci_set_powerstate(dev, state));
 180 }
 181
 182 static int
 183 pci_hostb_get_powerstate(device_t dev, device_t child)
 184 {
 185
 186         device_printf(dev, "child %s requested pci_get_powerstate\n",
 187             device_get_nameunit(child));
 188         return (pci_get_powerstate(dev));
 189 }
 190
 191 static int
 192 pci_hostb_assign_interrupt(device_t dev, device_t child)
 193 {
 194
 195         device_printf(dev, "child %s requested pci_assign_interrupt\n",
 196             device_get_nameunit(child));
 197         return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev));
 198 }
 199
 200 static int
 201 pci_hostb_find_extcap(device_t dev, device_t child, int capability,
 202     int *capreg)
 203 {
 204
 205         return (pci_find_extcap(dev, capability, capreg));
 206 }
 207
 208 static device_method_t pci_hostb_methods[] = {
 209         /* Device interface */
 210         DEVMETHOD(device_probe,         pci_hostb_probe),
 211         DEVMETHOD(device_attach,        pci_hostb_attach),
 212         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
 213         DEVMETHOD(device_suspend,       bus_generic_suspend),
 214         DEVMETHOD(device_resume,        bus_generic_resume),
 215
 216         /* Bus interface */
 217         DEVMETHOD(bus_read_ivar,        pci_hostb_read_ivar),
 218         DEVMETHOD(bus_write_ivar,       pci_hostb_write_ivar),
 219         DEVMETHOD(bus_setup_intr,       bus_generic_setup_intr),
 220         DEVMETHOD(bus_teardown_intr,    bus_generic_teardown_intr),
 221
 222         DEVMETHOD(bus_alloc_resource,   pci_hostb_alloc_resource),
 223         DEVMETHOD(bus_release_resource, pci_hostb_release_resource),
 224         DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
 225         DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
 226
 227         /* PCI interface */
 228         DEVMETHOD(pci_read_config,      pci_hostb_read_config),
 229         DEVMETHOD(pci_write_config,     pci_hostb_write_config),
 230         DEVMETHOD(pci_enable_busmaster, pci_hostb_enable_busmaster),
 231         DEVMETHOD(pci_disable_busmaster, pci_hostb_disable_busmaster),
 232         DEVMETHOD(pci_enable_io,        pci_hostb_enable_io),
 233         DEVMETHOD(pci_disable_io,       pci_hostb_disable_io),
 234         DEVMETHOD(pci_get_powerstate,   pci_hostb_get_powerstate),
 235         DEVMETHOD(pci_set_powerstate,   pci_hostb_set_powerstate),
 236         DEVMETHOD(pci_assign_interrupt, pci_hostb_assign_interrupt),
 237         DEVMETHOD(pci_find_extcap,      pci_hostb_find_extcap),
 238
 239         { 0, 0 }
 240 };
 241
 242 static driver_t pci_hostb_driver = {
 243         "hostb",
 244         pci_hostb_methods,
 245         1,
 246 };
 247
 248 static devclass_t pci_hostb_devclass;
 249
 250 DRIVER_MODULE(hostb, pci, pci_hostb_driver, pci_hostb_devclass, 0, 0);