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/cdefs.h> 29 #include <sys/param.h> 30 #include <sys/bus.h> 31 #include <sys/kernel.h> 32 #include <sys/module.h> 33 34 #include <dev/pci/pcivar.h> 35 #include <dev/pci/pcireg.h> 36 37 /* 38 * Provide a device to "eat" the host->pci bridge devices that show up 39 * on PCI buses and stop them showing up twice on the probes. This also 40 * stops them showing up as 'none' in pciconf -l. If the host bridge 41 * provides an AGP capability then we create a child agp device for the 42 * agp GART driver to attach to. 43 */ 44 static int 45 pci_hostb_probe(device_t dev) 46 { 47 u_int32_t id; 48 49 id = pci_get_devid(dev); 50 51 switch (id) { 52 /* VIA VT82C596 Power Management Function */ 53 case 0x30501106: 54 return (ENXIO); 55 56 default: 57 break; 58 } 59 60 if (pci_get_class(dev) == PCIC_BRIDGE && 61 pci_get_subclass(dev) == PCIS_BRIDGE_HOST) { 62 device_set_desc(dev, "Host to PCI bridge"); 63 device_quiet(dev); 64 return (-10000); 65 } 66 return (ENXIO); 67 } 68 69 static int 70 pci_hostb_attach(device_t dev) 71 { 72 73 bus_generic_probe(dev); 74 75 /* 76 * If AGP capabilities are present on this device, then create 77 * an AGP child. 78 */ 79 if (pci_find_cap(dev, PCIY_AGP, NULL) == 0) 80 device_add_child(dev, "agp", -1); 81 bus_generic_attach(dev); 82 return (0); 83 } 84 85 /* Bus interface. */ 86 87 static int 88 pci_hostb_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 89 { 90 91 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result)); 92 } 93 94 static int 95 pci_hostb_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 96 { 97 98 return (EINVAL); 99 } 100 101 static struct resource * 102 pci_hostb_alloc_resource(device_t dev, device_t child, int type, int *rid, 103 rman_res_t start, rman_res_t end, rman_res_t count, u_int flags) 104 { 105 106 return (bus_alloc_resource(dev, type, rid, start, end, count, flags)); 107 } 108 109 static int 110 pci_hostb_release_resource(device_t dev, device_t child, int type, int rid, 111 struct resource *r) 112 { 113 114 return (bus_release_resource(dev, type, rid, r)); 115 } 116 117 /* PCI interface. */ 118 119 static uint32_t 120 pci_hostb_read_config(device_t dev, device_t child, int reg, int width) 121 { 122 123 return (pci_read_config(dev, reg, width)); 124 } 125 126 static void 127 pci_hostb_write_config(device_t dev, device_t child, int reg, 128 uint32_t val, int width) 129 { 130 131 pci_write_config(dev, reg, val, width); 132 } 133 134 static int 135 pci_hostb_enable_busmaster(device_t dev, device_t child) 136 { 137 138 device_printf(dev, "child %s requested pci_enable_busmaster\n", 139 device_get_nameunit(child)); 140 return (pci_enable_busmaster(dev)); 141 } 142 143 static int 144 pci_hostb_disable_busmaster(device_t dev, device_t child) 145 { 146 147 device_printf(dev, "child %s requested pci_disable_busmaster\n", 148 device_get_nameunit(child)); 149 return (pci_disable_busmaster(dev)); 150 } 151 152 static int 153 pci_hostb_enable_io(device_t dev, device_t child, int space) 154 { 155 156 device_printf(dev, "child %s requested pci_enable_io\n", 157 device_get_nameunit(child)); 158 return (pci_enable_io(dev, space)); 159 } 160 161 static int 162 pci_hostb_disable_io(device_t dev, device_t child, int space) 163 { 164 165 device_printf(dev, "child %s requested pci_disable_io\n", 166 device_get_nameunit(child)); 167 return (pci_disable_io(dev, space)); 168 } 169 170 static int 171 pci_hostb_set_powerstate(device_t dev, device_t child, int state) 172 { 173 174 device_printf(dev, "child %s requested pci_set_powerstate\n", 175 device_get_nameunit(child)); 176 return (pci_set_powerstate(dev, state)); 177 } 178 179 static int 180 pci_hostb_get_powerstate(device_t dev, device_t child) 181 { 182 183 device_printf(dev, "child %s requested pci_get_powerstate\n", 184 device_get_nameunit(child)); 185 return (pci_get_powerstate(dev)); 186 } 187 188 static int 189 pci_hostb_assign_interrupt(device_t dev, device_t child) 190 { 191 192 device_printf(dev, "child %s requested pci_assign_interrupt\n", 193 device_get_nameunit(child)); 194 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev)); 195 } 196 197 static int 198 pci_hostb_find_cap(device_t dev, device_t child, int capability, 199 int *capreg) 200 { 201 202 return (pci_find_cap(dev, capability, capreg)); 203 } 204 205 static int 206 pci_hostb_find_next_cap(device_t dev, device_t child, int capability, 207 int start, int *capreg) 208 { 209 210 return (pci_find_next_cap(dev, capability, start, capreg)); 211 } 212 213 static int 214 pci_hostb_find_extcap(device_t dev, device_t child, int capability, 215 int *capreg) 216 { 217 218 return (pci_find_extcap(dev, capability, capreg)); 219 } 220 221 static int 222 pci_hostb_find_next_extcap(device_t dev, device_t child, int capability, 223 int start, int *capreg) 224 { 225 226 return (pci_find_next_extcap(dev, capability, start, capreg)); 227 } 228 229 static int 230 pci_hostb_find_htcap(device_t dev, device_t child, int capability, 231 int *capreg) 232 { 233 234 return (pci_find_htcap(dev, capability, capreg)); 235 } 236 237 static int 238 pci_hostb_find_next_htcap(device_t dev, device_t child, int capability, 239 int start, int *capreg) 240 { 241 242 return (pci_find_next_htcap(dev, capability, start, capreg)); 243 } 244 245 static device_method_t pci_hostb_methods[] = { 246 /* Device interface */ 247 DEVMETHOD(device_probe, pci_hostb_probe), 248 DEVMETHOD(device_attach, pci_hostb_attach), 249 DEVMETHOD(device_shutdown, bus_generic_shutdown), 250 DEVMETHOD(device_suspend, bus_generic_suspend), 251 DEVMETHOD(device_resume, bus_generic_resume), 252 253 /* Bus interface */ 254 DEVMETHOD(bus_read_ivar, pci_hostb_read_ivar), 255 DEVMETHOD(bus_write_ivar, pci_hostb_write_ivar), 256 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 257 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 258 259 DEVMETHOD(bus_alloc_resource, pci_hostb_alloc_resource), 260 DEVMETHOD(bus_release_resource, pci_hostb_release_resource), 261 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 262 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 263 264 /* PCI interface */ 265 DEVMETHOD(pci_read_config, pci_hostb_read_config), 266 DEVMETHOD(pci_write_config, pci_hostb_write_config), 267 DEVMETHOD(pci_enable_busmaster, pci_hostb_enable_busmaster), 268 DEVMETHOD(pci_disable_busmaster, pci_hostb_disable_busmaster), 269 DEVMETHOD(pci_enable_io, pci_hostb_enable_io), 270 DEVMETHOD(pci_disable_io, pci_hostb_disable_io), 271 DEVMETHOD(pci_get_powerstate, pci_hostb_get_powerstate), 272 DEVMETHOD(pci_set_powerstate, pci_hostb_set_powerstate), 273 DEVMETHOD(pci_assign_interrupt, pci_hostb_assign_interrupt), 274 DEVMETHOD(pci_find_cap, pci_hostb_find_cap), 275 DEVMETHOD(pci_find_next_cap, pci_hostb_find_next_cap), 276 DEVMETHOD(pci_find_extcap, pci_hostb_find_extcap), 277 DEVMETHOD(pci_find_next_extcap, pci_hostb_find_next_extcap), 278 DEVMETHOD(pci_find_htcap, pci_hostb_find_htcap), 279 DEVMETHOD(pci_find_next_htcap, pci_hostb_find_next_htcap), 280 { 0, 0 } 281 }; 282 283 static driver_t pci_hostb_driver = { 284 "hostb", 285 pci_hostb_methods, 286 1, 287 }; 288 289 DRIVER_MODULE(hostb, pci, pci_hostb_driver, 0, 0); 290