1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright 1997, Stefan Esser <se@freebsd.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/param.h> 29 #include <sys/bus.h> 30 #include <sys/kernel.h> 31 #include <sys/module.h> 32 33 #include <dev/pci/pcivar.h> 34 #include <dev/pci/pcireg.h> 35 36 /* 37 * Provide a device to "eat" the host->pci bridge devices that show up 38 * on PCI buses and stop them showing up twice on the probes. This also 39 * stops them showing up as 'none' in pciconf -l. If the host bridge 40 * provides an AGP capability then we create a child agp device for the 41 * agp GART driver to attach to. 42 */ 43 static int 44 pci_hostb_probe(device_t dev) 45 { 46 u_int32_t id; 47 48 id = pci_get_devid(dev); 49 50 switch (id) { 51 /* VIA VT82C596 Power Management Function */ 52 case 0x30501106: 53 return (ENXIO); 54 55 default: 56 break; 57 } 58 59 if (pci_get_class(dev) == PCIC_BRIDGE && 60 pci_get_subclass(dev) == PCIS_BRIDGE_HOST) { 61 device_set_desc(dev, "Host to PCI bridge"); 62 device_quiet(dev); 63 return (-10000); 64 } 65 return (ENXIO); 66 } 67 68 static int 69 pci_hostb_attach(device_t dev) 70 { 71 72 bus_generic_probe(dev); 73 74 /* 75 * If AGP capabilities are present on this device, then create 76 * an AGP child. 77 */ 78 if (pci_find_cap(dev, PCIY_AGP, NULL) == 0) 79 device_add_child(dev, "agp", -1); 80 bus_generic_attach(dev); 81 return (0); 82 } 83 84 /* Bus interface. */ 85 86 static int 87 pci_hostb_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 88 { 89 90 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result)); 91 } 92 93 static int 94 pci_hostb_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 95 { 96 97 return (EINVAL); 98 } 99 100 static struct resource * 101 pci_hostb_alloc_resource(device_t dev, device_t child, int type, int *rid, 102 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 103 { 104 105 return (bus_alloc_resource(dev, type, rid, start, end, count, flags)); 106 } 107 108 static int 109 pci_hostb_release_resource(device_t dev, device_t child, struct resource *r) 110 { 111 112 return (bus_release_resource(dev, r)); 113 } 114 115 /* PCI interface. */ 116 117 static uint32_t 118 pci_hostb_read_config(device_t dev, device_t child, int reg, int width) 119 { 120 121 return (pci_read_config(dev, reg, width)); 122 } 123 124 static void 125 pci_hostb_write_config(device_t dev, device_t child, int reg, 126 uint32_t val, int width) 127 { 128 129 pci_write_config(dev, reg, val, width); 130 } 131 132 static int 133 pci_hostb_enable_busmaster(device_t dev, device_t child) 134 { 135 136 device_printf(dev, "child %s requested pci_enable_busmaster\n", 137 device_get_nameunit(child)); 138 return (pci_enable_busmaster(dev)); 139 } 140 141 static int 142 pci_hostb_disable_busmaster(device_t dev, device_t child) 143 { 144 145 device_printf(dev, "child %s requested pci_disable_busmaster\n", 146 device_get_nameunit(child)); 147 return (pci_disable_busmaster(dev)); 148 } 149 150 static int 151 pci_hostb_enable_io(device_t dev, device_t child, int space) 152 { 153 154 device_printf(dev, "child %s requested pci_enable_io\n", 155 device_get_nameunit(child)); 156 return (pci_enable_io(dev, space)); 157 } 158 159 static int 160 pci_hostb_disable_io(device_t dev, device_t child, int space) 161 { 162 163 device_printf(dev, "child %s requested pci_disable_io\n", 164 device_get_nameunit(child)); 165 return (pci_disable_io(dev, space)); 166 } 167 168 static int 169 pci_hostb_set_powerstate(device_t dev, device_t child, int state) 170 { 171 172 device_printf(dev, "child %s requested pci_set_powerstate\n", 173 device_get_nameunit(child)); 174 return (pci_set_powerstate(dev, state)); 175 } 176 177 static int 178 pci_hostb_get_powerstate(device_t dev, device_t child) 179 { 180 181 device_printf(dev, "child %s requested pci_get_powerstate\n", 182 device_get_nameunit(child)); 183 return (pci_get_powerstate(dev)); 184 } 185 186 static int 187 pci_hostb_assign_interrupt(device_t dev, device_t child) 188 { 189 190 device_printf(dev, "child %s requested pci_assign_interrupt\n", 191 device_get_nameunit(child)); 192 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev)); 193 } 194 195 static int 196 pci_hostb_find_cap(device_t dev, device_t child, int capability, 197 int *capreg) 198 { 199 200 return (pci_find_cap(dev, capability, capreg)); 201 } 202 203 static int 204 pci_hostb_find_next_cap(device_t dev, device_t child, int capability, 205 int start, int *capreg) 206 { 207 208 return (pci_find_next_cap(dev, capability, start, capreg)); 209 } 210 211 static int 212 pci_hostb_find_extcap(device_t dev, device_t child, int capability, 213 int *capreg) 214 { 215 216 return (pci_find_extcap(dev, capability, capreg)); 217 } 218 219 static int 220 pci_hostb_find_next_extcap(device_t dev, device_t child, int capability, 221 int start, int *capreg) 222 { 223 224 return (pci_find_next_extcap(dev, capability, start, capreg)); 225 } 226 227 static int 228 pci_hostb_find_htcap(device_t dev, device_t child, int capability, 229 int *capreg) 230 { 231 232 return (pci_find_htcap(dev, capability, capreg)); 233 } 234 235 static int 236 pci_hostb_find_next_htcap(device_t dev, device_t child, int capability, 237 int start, int *capreg) 238 { 239 240 return (pci_find_next_htcap(dev, capability, start, capreg)); 241 } 242 243 static device_method_t pci_hostb_methods[] = { 244 /* Device interface */ 245 DEVMETHOD(device_probe, pci_hostb_probe), 246 DEVMETHOD(device_attach, pci_hostb_attach), 247 DEVMETHOD(device_shutdown, bus_generic_shutdown), 248 DEVMETHOD(device_suspend, bus_generic_suspend), 249 DEVMETHOD(device_resume, bus_generic_resume), 250 251 /* Bus interface */ 252 DEVMETHOD(bus_read_ivar, pci_hostb_read_ivar), 253 DEVMETHOD(bus_write_ivar, pci_hostb_write_ivar), 254 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 255 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 256 257 DEVMETHOD(bus_alloc_resource, pci_hostb_alloc_resource), 258 DEVMETHOD(bus_release_resource, pci_hostb_release_resource), 259 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 260 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 261 262 /* PCI interface */ 263 DEVMETHOD(pci_read_config, pci_hostb_read_config), 264 DEVMETHOD(pci_write_config, pci_hostb_write_config), 265 DEVMETHOD(pci_enable_busmaster, pci_hostb_enable_busmaster), 266 DEVMETHOD(pci_disable_busmaster, pci_hostb_disable_busmaster), 267 DEVMETHOD(pci_enable_io, pci_hostb_enable_io), 268 DEVMETHOD(pci_disable_io, pci_hostb_disable_io), 269 DEVMETHOD(pci_get_powerstate, pci_hostb_get_powerstate), 270 DEVMETHOD(pci_set_powerstate, pci_hostb_set_powerstate), 271 DEVMETHOD(pci_assign_interrupt, pci_hostb_assign_interrupt), 272 DEVMETHOD(pci_find_cap, pci_hostb_find_cap), 273 DEVMETHOD(pci_find_next_cap, pci_hostb_find_next_cap), 274 DEVMETHOD(pci_find_extcap, pci_hostb_find_extcap), 275 DEVMETHOD(pci_find_next_extcap, pci_hostb_find_next_extcap), 276 DEVMETHOD(pci_find_htcap, pci_hostb_find_htcap), 277 DEVMETHOD(pci_find_next_htcap, pci_hostb_find_next_htcap), 278 { 0, 0 } 279 }; 280 281 static driver_t pci_hostb_driver = { 282 "hostb", 283 pci_hostb_methods, 284 1, 285 }; 286 287 DRIVER_MODULE(hostb, pci, pci_hostb_driver, 0, 0); 288