1 /*- 2 * Copyright (c) 2005 John Baldwin <jhb@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, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the author nor the names of any co-contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sys/dev/pci/vga_pci.c,v 1.5.8.1 2009/04/15 03:14:26 kensmith Exp $ 30 */ 31 32 /* 33 * Simple driver for PCI VGA display devices. Drivers such as agp(4) and 34 * drm(4) should attach as children of this device. 35 * 36 * XXX: The vgapci name is a hack until we somehow merge the isa vga driver 37 * in or rename it. 38 */ 39 40 #include <sys/param.h> 41 #include <sys/bus.h> 42 #include <sys/kernel.h> 43 #include <sys/module.h> 44 #include <sys/rman.h> 45 #include <sys/sysctl.h> 46 #include <sys/systm.h> 47 48 #include <machine/pmap.h> 49 50 #include <bus/pci/pcireg.h> 51 #include <bus/pci/pcivar.h> 52 53 struct vga_resource { 54 struct resource *vr_res; 55 int vr_refs; 56 }; 57 58 struct vga_pci_softc { 59 device_t vga_msi_child; /* Child driver using MSI. */ 60 struct vga_resource vga_bars[PCIR_MAX_BAR_0 + 1]; 61 struct vga_resource vga_bios; 62 }; 63 64 SYSCTL_DECL(_hw_pci); 65 66 static struct vga_resource *lookup_res(struct vga_pci_softc *sc, int rid); 67 static struct resource *vga_pci_alloc_resource(device_t dev, device_t child, 68 int type, int *rid, u_long start, u_long end, u_long count, u_int flags, 69 int cpuid); 70 static int vga_pci_release_resource(device_t dev, device_t child, int type, 71 int rid, struct resource *r); 72 73 int vga_pci_default_unit = -1; 74 TUNABLE_INT("hw.pci.default_vgapci_unit", &vga_pci_default_unit); 75 SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RD, 76 &vga_pci_default_unit, -1, "Default VGA-compatible display"); 77 78 int 79 vga_pci_is_boot_display(device_t dev) 80 { 81 int unit; 82 device_t pcib; 83 uint16_t config; 84 85 /* Check that the given device is a video card */ 86 if ((pci_get_class(dev) != PCIC_DISPLAY && 87 (pci_get_class(dev) != PCIC_OLD || 88 pci_get_subclass(dev) != PCIS_OLD_VGA))) 89 return (0); 90 91 unit = device_get_unit(dev); 92 93 if (vga_pci_default_unit >= 0) { 94 /* 95 * The boot display device was determined by a previous 96 * call to this function, or the user forced it using 97 * the hw.pci.default_vgapci_unit tunable. 98 */ 99 return (vga_pci_default_unit == unit); 100 } 101 102 /* 103 * The primary video card used as a boot display must have the 104 * "I/O" and "Memory Address Space Decoding" bits set in its 105 * Command register. 106 * 107 * Furthermore, if the card is attached to a bridge, instead of 108 * the root PCI bus, the bridge must have the "VGA Enable" bit 109 * set in its Control register. 110 */ 111 112 pcib = device_get_parent(device_get_parent(dev)); 113 if (device_get_devclass(device_get_parent(pcib)) == 114 devclass_find("pci")) { 115 /* 116 * The parent bridge is a PCI-to-PCI bridge: check the 117 * value of the "VGA Enable" bit. 118 */ 119 config = pci_read_config(pcib, PCIR_BRIDGECTL_1, 2); 120 if ((config & PCIB_BCR_VGA_ENABLE) == 0) 121 return (0); 122 } 123 124 config = pci_read_config(dev, PCIR_COMMAND, 2); 125 if ((config & (PCIM_CMD_PORTEN | PCIM_CMD_MEMEN)) == 0) 126 return (0); 127 128 /* This video card is the boot display: record its unit number. */ 129 vga_pci_default_unit = unit; 130 device_set_flags(dev, 1); 131 132 return (1); 133 } 134 135 void * 136 vga_pci_map_bios(device_t dev, size_t *size) 137 { 138 int rid; 139 struct resource *res; 140 141 if (vga_pci_is_boot_display(dev)) { 142 /* 143 * On x86, the System BIOS copy the default display 144 * device's Video BIOS at a fixed location in system 145 * memory (0xC0000, 128 kBytes long) at boot time. 146 * 147 * We use this copy for the default boot device, because 148 * the original ROM may not be valid after boot. 149 */ 150 151 *size = VGA_PCI_BIOS_SHADOW_SIZE; 152 return (pmap_mapbios(VGA_PCI_BIOS_SHADOW_ADDR, *size)); 153 } 154 155 rid = PCIR_BIOS; 156 res = vga_pci_alloc_resource(dev, NULL, SYS_RES_MEMORY, &rid, 0ul, 157 ~0ul, 1, RF_ACTIVE, -1); 158 if (res == NULL) { 159 return (NULL); 160 } 161 162 *size = rman_get_size(res); 163 return (rman_get_virtual(res)); 164 } 165 166 void 167 vga_pci_unmap_bios(device_t dev, void *bios) 168 { 169 struct vga_resource *vr; 170 171 if (bios == NULL) { 172 return; 173 } 174 175 if (vga_pci_is_boot_display(dev)) { 176 /* We mapped the BIOS shadow copy located at 0xC0000. */ 177 pmap_unmapdev((vm_offset_t)bios, VGA_PCI_BIOS_SHADOW_SIZE); 178 179 return; 180 } 181 182 /* 183 * Look up the PCIR_BIOS resource in our softc. It should match 184 * the address we returned previously. 185 */ 186 vr = lookup_res(device_get_softc(dev), PCIR_BIOS); 187 KASSERT(vr->vr_res != NULL, ("vga_pci_unmap_bios: bios not mapped")); 188 KASSERT(rman_get_virtual(vr->vr_res) == bios, 189 ("vga_pci_unmap_bios: mismatch")); 190 vga_pci_release_resource(dev, NULL, SYS_RES_MEMORY, PCIR_BIOS, 191 vr->vr_res); 192 } 193 194 static int 195 vga_pci_probe(device_t dev) 196 { 197 198 switch (pci_get_class(dev)) { 199 case PCIC_DISPLAY: 200 break; 201 case PCIC_OLD: 202 if (pci_get_subclass(dev) != PCIS_OLD_VGA) 203 return (ENXIO); 204 break; 205 default: 206 return (ENXIO); 207 } 208 209 /* Probe default display. */ 210 vga_pci_is_boot_display(dev); 211 212 device_set_desc(dev, "VGA-compatible display"); 213 return (BUS_PROBE_GENERIC); 214 } 215 216 static int 217 vga_pci_attach(device_t dev) 218 { 219 220 bus_generic_probe(dev); 221 222 /* Always create a drm child for now to make it easier on drm. */ 223 device_add_child(dev, "drm", -1); 224 bus_generic_attach(dev); 225 226 if (vga_pci_is_boot_display(dev)) 227 device_printf(dev, "Boot video device\n"); 228 229 return (0); 230 } 231 232 static int 233 vga_pci_suspend(device_t dev) 234 { 235 236 return (bus_generic_suspend(dev)); 237 } 238 239 static int 240 vga_pci_resume(device_t dev) 241 { 242 243 return (bus_generic_resume(dev)); 244 } 245 246 /* Bus interface. */ 247 248 static int 249 vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 250 { 251 252 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result)); 253 } 254 255 static int 256 vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 257 { 258 259 return (EINVAL); 260 } 261 262 static int 263 vga_pci_setup_intr(device_t dev, device_t child, struct resource *irq, 264 int flags, driver_intr_t *intr, void *arg, void **cookiep, 265 lwkt_serialize_t serializer, const char *desc) 266 { 267 268 return (BUS_SETUP_INTR(device_get_parent(dev), dev, irq, flags, 269 intr, arg, cookiep, serializer, desc)); 270 } 271 272 static int 273 vga_pci_teardown_intr(device_t dev, device_t child, struct resource *irq, 274 void *cookie) 275 { 276 277 return (BUS_TEARDOWN_INTR(device_get_parent(dev), dev, irq, cookie)); 278 } 279 280 static struct vga_resource * 281 lookup_res(struct vga_pci_softc *sc, int rid) 282 { 283 int bar; 284 285 if (rid == PCIR_BIOS) 286 return (&sc->vga_bios); 287 bar = PCI_RID2BAR(rid); 288 if (bar >= 0 && bar <= PCIR_MAX_BAR_0) 289 return (&sc->vga_bars[bar]); 290 return (NULL); 291 } 292 293 static struct resource * 294 vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid, 295 u_long start, u_long end, u_long count, u_int flags, int cpuid __unused) 296 { 297 struct vga_resource *vr; 298 299 switch (type) { 300 case SYS_RES_MEMORY: 301 case SYS_RES_IOPORT: 302 /* 303 * For BARs, we cache the resource so that we only allocate it 304 * from the PCI bus once. 305 */ 306 vr = lookup_res(device_get_softc(dev), *rid); 307 if (vr == NULL) 308 return (NULL); 309 if (vr->vr_res == NULL) 310 vr->vr_res = bus_alloc_resource(dev, type, rid, start, 311 end, count, flags); 312 if (vr->vr_res != NULL) 313 vr->vr_refs++; 314 return (vr->vr_res); 315 } 316 return (bus_alloc_resource(dev, type, rid, start, end, count, flags)); 317 } 318 319 static int 320 vga_pci_release_resource(device_t dev, device_t child, int type, int rid, 321 struct resource *r) 322 { 323 struct vga_resource *vr; 324 325 switch (type) { 326 case SYS_RES_MEMORY: 327 case SYS_RES_IOPORT: 328 /* 329 * Stop caching the resource when refs drops to 0 330 */ 331 vr = lookup_res(device_get_softc(dev), rid); 332 if (vr && vr->vr_refs > 0) { 333 if (--vr->vr_refs > 0) 334 return(0); 335 vr->vr_res = NULL; 336 /* fall through */ 337 } 338 /* fall through */ 339 break; 340 } 341 return (bus_release_resource(dev, type, rid, r)); 342 } 343 344 /* PCI interface. */ 345 346 static uint32_t 347 vga_pci_read_config(device_t dev, device_t child, int reg, int width) 348 { 349 350 return (pci_read_config(dev, reg, width)); 351 } 352 353 static void 354 vga_pci_write_config(device_t dev, device_t child, int reg, 355 uint32_t val, int width) 356 { 357 358 pci_write_config(dev, reg, val, width); 359 } 360 361 static int 362 vga_pci_enable_busmaster(device_t dev, device_t child) 363 { 364 365 return (pci_enable_busmaster(dev)); 366 } 367 368 static int 369 vga_pci_disable_busmaster(device_t dev, device_t child) 370 { 371 372 return (pci_disable_busmaster(dev)); 373 } 374 375 static int 376 vga_pci_enable_io(device_t dev, device_t child, int space) 377 { 378 379 device_printf(dev, "child %s requested pci_enable_io\n", 380 device_get_nameunit(child)); 381 return (pci_enable_io(dev, space)); 382 } 383 384 static int 385 vga_pci_disable_io(device_t dev, device_t child, int space) 386 { 387 388 device_printf(dev, "child %s requested pci_disable_io\n", 389 device_get_nameunit(child)); 390 return (pci_disable_io(dev, space)); 391 } 392 393 static int 394 vga_pci_get_vpd_ident(device_t dev, device_t child, const char **identptr) 395 { 396 397 return (pci_get_vpd_ident(dev, identptr)); 398 } 399 400 static int 401 vga_pci_get_vpd_readonly(device_t dev, device_t child, const char *kw, 402 const char **vptr) 403 { 404 405 return (pci_get_vpd_readonly(dev, kw, vptr)); 406 } 407 408 static int 409 vga_pci_set_powerstate(device_t dev, device_t child, int state) 410 { 411 412 device_printf(dev, "child %s requested pci_set_powerstate\n", 413 device_get_nameunit(child)); 414 return (pci_set_powerstate(dev, state)); 415 } 416 417 static int 418 vga_pci_get_powerstate(device_t dev, device_t child) 419 { 420 421 device_printf(dev, "child %s requested pci_get_powerstate\n", 422 device_get_nameunit(child)); 423 return (pci_get_powerstate(dev)); 424 } 425 426 static int 427 vga_pci_assign_interrupt(device_t dev, device_t child) 428 { 429 430 device_printf(dev, "child %s requested pci_assign_interrupt\n", 431 device_get_nameunit(child)); 432 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev)); 433 } 434 435 static int 436 vga_pci_find_extcap(device_t dev, device_t child, int capability, 437 int *capreg) 438 { 439 440 return (pci_find_extcap(dev, capability, capreg)); 441 } 442 443 static int 444 vga_pci_alloc_msi(device_t dev, device_t child, int *rid, int count, 445 int cpuid) 446 { 447 struct vga_pci_softc *sc; 448 int error; 449 450 sc = device_get_softc(dev); 451 if (sc->vga_msi_child != NULL) 452 return (EBUSY); 453 error = pci_alloc_msi(dev, rid, count, cpuid); 454 if (error == 0) 455 sc->vga_msi_child = child; 456 return (error); 457 } 458 459 static int 460 vga_pci_release_msi(device_t dev, device_t child) 461 { 462 struct vga_pci_softc *sc; 463 int error; 464 465 sc = device_get_softc(dev); 466 if (sc->vga_msi_child != child) 467 return (ENXIO); 468 error = pci_release_msi(dev); 469 if (error == 0) 470 sc->vga_msi_child = NULL; 471 return (error); 472 } 473 474 static int 475 vga_pci_msi_count(device_t dev, device_t child) 476 { 477 478 return (pci_msi_count(dev)); 479 } 480 481 static device_method_t vga_pci_methods[] = { 482 /* Device interface */ 483 DEVMETHOD(device_probe, vga_pci_probe), 484 DEVMETHOD(device_attach, vga_pci_attach), 485 DEVMETHOD(device_shutdown, bus_generic_shutdown), 486 DEVMETHOD(device_suspend, vga_pci_suspend), 487 DEVMETHOD(device_resume, vga_pci_resume), 488 489 /* Bus interface */ 490 DEVMETHOD(bus_read_ivar, vga_pci_read_ivar), 491 DEVMETHOD(bus_write_ivar, vga_pci_write_ivar), 492 DEVMETHOD(bus_setup_intr, vga_pci_setup_intr), 493 DEVMETHOD(bus_teardown_intr, vga_pci_teardown_intr), 494 495 DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource), 496 DEVMETHOD(bus_release_resource, vga_pci_release_resource), 497 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 498 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 499 500 /* PCI interface */ 501 DEVMETHOD(pci_read_config, vga_pci_read_config), 502 DEVMETHOD(pci_write_config, vga_pci_write_config), 503 DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster), 504 DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster), 505 DEVMETHOD(pci_enable_io, vga_pci_enable_io), 506 DEVMETHOD(pci_disable_io, vga_pci_disable_io), 507 DEVMETHOD(pci_get_vpd_ident, vga_pci_get_vpd_ident), 508 DEVMETHOD(pci_get_vpd_readonly, vga_pci_get_vpd_readonly), 509 DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate), 510 DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate), 511 DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt), 512 DEVMETHOD(pci_find_extcap, vga_pci_find_extcap), 513 DEVMETHOD(pci_alloc_msi, vga_pci_alloc_msi), 514 DEVMETHOD(pci_release_msi, vga_pci_release_msi), 515 DEVMETHOD(pci_msi_count, vga_pci_msi_count), 516 517 DEVMETHOD_END 518 }; 519 520 static driver_t vga_pci_driver = { 521 "vgapci", 522 vga_pci_methods, 523 sizeof(struct vga_pci_softc), 524 }; 525 526 static devclass_t vga_devclass; 527 528 DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, NULL, NULL); 529