vga_pci.c revision 249476
178189Sbrian/*- 278189Sbrian * Copyright (c) 2005 John Baldwin <jhb@FreeBSD.org> 378189Sbrian * All rights reserved. 478189Sbrian * 578189Sbrian * Redistribution and use in source and binary forms, with or without 613389Sphk * modification, are permitted provided that the following conditions 778189Sbrian * are met: 878189Sbrian * 1. Redistributions of source code must retain the above copyright 978189Sbrian * notice, this list of conditions and the following disclaimer. 1078189Sbrian * 2. Redistributions in binary form must reproduce the above copyright 1178189Sbrian * notice, this list of conditions and the following disclaimer in the 1278189Sbrian * documentation and/or other materials provided with the distribution. 1378189Sbrian * 3. Neither the name of the author nor the names of any co-contributors 1478189Sbrian * may be used to endorse or promote products derived from this software 1513389Sphk * without specific prior written permission. 1678189Sbrian * 1778189Sbrian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1878189Sbrian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1978189Sbrian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2078189Sbrian * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2178189Sbrian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2278189Sbrian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2378189Sbrian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2478189Sbrian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2578189Sbrian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2678189Sbrian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2713389Sphk * SUCH DAMAGE. 2850479Speter */ 2913389Sphk 3013389Sphk#include <sys/cdefs.h> 3136285Sbrian__FBSDID("$FreeBSD: head/sys/dev/pci/vga_pci.c 249476 2013-04-14 14:02:34Z kib $"); 3236285Sbrian 3336285Sbrian/* 34134789Sbrian * Simple driver for PCI VGA display devices. Drivers such as agp(4) and 35134789Sbrian * drm(4) should attach as children of this device. 36134789Sbrian * 37 * XXX: The vgapci name is a hack until we somehow merge the isa vga driver 38 * in or rename it. 39 */ 40 41#include <sys/param.h> 42#include <sys/bus.h> 43#include <sys/kernel.h> 44#include <sys/module.h> 45#include <sys/rman.h> 46#include <sys/sysctl.h> 47#include <sys/systm.h> 48 49#include <dev/pci/pcireg.h> 50#include <dev/pci/pcivar.h> 51 52struct vga_resource { 53 struct resource *vr_res; 54 int vr_refs; 55}; 56 57struct vga_pci_softc { 58 device_t vga_msi_child; /* Child driver using MSI. */ 59 struct vga_resource vga_bars[PCIR_MAX_BAR_0 + 1]; 60 struct vga_resource vga_bios; 61}; 62 63SYSCTL_DECL(_hw_pci); 64 65int vga_pci_default_unit = -1; 66TUNABLE_INT("hw.pci.default_vgapci_unit", &vga_pci_default_unit); 67SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RDTUN, 68 &vga_pci_default_unit, -1, "Default VGA-compatible display"); 69 70static int 71vga_pci_probe(device_t dev) 72{ 73 device_t bdev; 74 int unit; 75 uint16_t bctl; 76 77 switch (pci_get_class(dev)) { 78 case PCIC_DISPLAY: 79 break; 80 case PCIC_OLD: 81 if (pci_get_subclass(dev) != PCIS_OLD_VGA) 82 return (ENXIO); 83 break; 84 default: 85 return (ENXIO); 86 } 87 88 /* Probe default display. */ 89 unit = device_get_unit(dev); 90 bdev = device_get_parent(device_get_parent(dev)); 91 bctl = pci_read_config(bdev, PCIR_BRIDGECTL_1, 2); 92 if (vga_pci_default_unit < 0 && (bctl & PCIB_BCR_VGA_ENABLE) != 0) 93 vga_pci_default_unit = unit; 94 if (vga_pci_default_unit == unit) 95 device_set_flags(dev, 1); 96 97 device_set_desc(dev, "VGA-compatible display"); 98 return (BUS_PROBE_GENERIC); 99} 100 101static int 102vga_pci_attach(device_t dev) 103{ 104 105 bus_generic_probe(dev); 106 107 /* Always create a drm child for now to make it easier on drm. */ 108 device_add_child(dev, "drm", -1); 109 device_add_child(dev, "drmn", -1); 110 bus_generic_attach(dev); 111 return (0); 112} 113 114static int 115vga_pci_suspend(device_t dev) 116{ 117 118 return (bus_generic_suspend(dev)); 119} 120 121static int 122vga_pci_resume(device_t dev) 123{ 124 125 return (bus_generic_resume(dev)); 126} 127 128/* Bus interface. */ 129 130static int 131vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 132{ 133 134 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result)); 135} 136 137static int 138vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 139{ 140 141 return (EINVAL); 142} 143 144static int 145vga_pci_setup_intr(device_t dev, device_t child, struct resource *irq, 146 int flags, driver_filter_t *filter, driver_intr_t *intr, void *arg, 147 void **cookiep) 148{ 149 return (BUS_SETUP_INTR(device_get_parent(dev), dev, irq, flags, 150 filter, intr, arg, cookiep)); 151} 152 153static int 154vga_pci_teardown_intr(device_t dev, device_t child, struct resource *irq, 155 void *cookie) 156{ 157 return (BUS_TEARDOWN_INTR(device_get_parent(dev), dev, irq, cookie)); 158} 159 160static struct vga_resource * 161lookup_res(struct vga_pci_softc *sc, int rid) 162{ 163 int bar; 164 165 if (rid == PCIR_BIOS) 166 return (&sc->vga_bios); 167 bar = PCI_RID2BAR(rid); 168 if (bar >= 0 && bar <= PCIR_MAX_BAR_0) 169 return (&sc->vga_bars[bar]); 170 return (NULL); 171} 172 173static struct resource * 174vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid, 175 u_long start, u_long end, u_long count, u_int flags) 176{ 177 struct vga_resource *vr; 178 179 switch (type) { 180 case SYS_RES_MEMORY: 181 case SYS_RES_IOPORT: 182 /* 183 * For BARs, we cache the resource so that we only allocate it 184 * from the PCI bus once. 185 */ 186 vr = lookup_res(device_get_softc(dev), *rid); 187 if (vr == NULL) 188 return (NULL); 189 if (vr->vr_res == NULL) 190 vr->vr_res = bus_alloc_resource(dev, type, rid, start, 191 end, count, flags); 192 if (vr->vr_res != NULL) 193 vr->vr_refs++; 194 return (vr->vr_res); 195 } 196 return (bus_alloc_resource(dev, type, rid, start, end, count, flags)); 197} 198 199static int 200vga_pci_release_resource(device_t dev, device_t child, int type, int rid, 201 struct resource *r) 202{ 203 struct vga_resource *vr; 204 int error; 205 206 switch (type) { 207 case SYS_RES_MEMORY: 208 case SYS_RES_IOPORT: 209 /* 210 * For BARs, we release the resource from the PCI bus 211 * when the last child reference goes away. 212 */ 213 vr = lookup_res(device_get_softc(dev), rid); 214 if (vr == NULL) 215 return (EINVAL); 216 if (vr->vr_res == NULL) 217 return (EINVAL); 218 KASSERT(vr->vr_res == r, ("vga_pci resource mismatch")); 219 if (vr->vr_refs > 1) { 220 vr->vr_refs--; 221 return (0); 222 } 223 KASSERT(vr->vr_refs > 0, 224 ("vga_pci resource reference count underflow")); 225 error = bus_release_resource(dev, type, rid, r); 226 if (error == 0) { 227 vr->vr_res = NULL; 228 vr->vr_refs = 0; 229 } 230 return (error); 231 } 232 233 return (bus_release_resource(dev, type, rid, r)); 234} 235 236/* PCI interface. */ 237 238static uint32_t 239vga_pci_read_config(device_t dev, device_t child, int reg, int width) 240{ 241 242 return (pci_read_config(dev, reg, width)); 243} 244 245static void 246vga_pci_write_config(device_t dev, device_t child, int reg, 247 uint32_t val, int width) 248{ 249 250 pci_write_config(dev, reg, val, width); 251} 252 253static int 254vga_pci_enable_busmaster(device_t dev, device_t child) 255{ 256 257 return (pci_enable_busmaster(dev)); 258} 259 260static int 261vga_pci_disable_busmaster(device_t dev, device_t child) 262{ 263 264 return (pci_disable_busmaster(dev)); 265} 266 267static int 268vga_pci_enable_io(device_t dev, device_t child, int space) 269{ 270 271 device_printf(dev, "child %s requested pci_enable_io\n", 272 device_get_nameunit(child)); 273 return (pci_enable_io(dev, space)); 274} 275 276static int 277vga_pci_disable_io(device_t dev, device_t child, int space) 278{ 279 280 device_printf(dev, "child %s requested pci_disable_io\n", 281 device_get_nameunit(child)); 282 return (pci_disable_io(dev, space)); 283} 284 285static int 286vga_pci_get_vpd_ident(device_t dev, device_t child, const char **identptr) 287{ 288 289 return (pci_get_vpd_ident(dev, identptr)); 290} 291 292static int 293vga_pci_get_vpd_readonly(device_t dev, device_t child, const char *kw, 294 const char **vptr) 295{ 296 297 return (pci_get_vpd_readonly(dev, kw, vptr)); 298} 299 300static int 301vga_pci_set_powerstate(device_t dev, device_t child, int state) 302{ 303 304 device_printf(dev, "child %s requested pci_set_powerstate\n", 305 device_get_nameunit(child)); 306 return (pci_set_powerstate(dev, state)); 307} 308 309static int 310vga_pci_get_powerstate(device_t dev, device_t child) 311{ 312 313 device_printf(dev, "child %s requested pci_get_powerstate\n", 314 device_get_nameunit(child)); 315 return (pci_get_powerstate(dev)); 316} 317 318static int 319vga_pci_assign_interrupt(device_t dev, device_t child) 320{ 321 322 device_printf(dev, "child %s requested pci_assign_interrupt\n", 323 device_get_nameunit(child)); 324 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev)); 325} 326 327static int 328vga_pci_find_cap(device_t dev, device_t child, int capability, 329 int *capreg) 330{ 331 332 return (pci_find_cap(dev, capability, capreg)); 333} 334 335static int 336vga_pci_find_extcap(device_t dev, device_t child, int capability, 337 int *capreg) 338{ 339 340 return (pci_find_extcap(dev, capability, capreg)); 341} 342 343static int 344vga_pci_find_htcap(device_t dev, device_t child, int capability, 345 int *capreg) 346{ 347 348 return (pci_find_htcap(dev, capability, capreg)); 349} 350 351static int 352vga_pci_alloc_msi(device_t dev, device_t child, int *count) 353{ 354 struct vga_pci_softc *sc; 355 int error; 356 357 sc = device_get_softc(dev); 358 if (sc->vga_msi_child != NULL) 359 return (EBUSY); 360 error = pci_alloc_msi(dev, count); 361 if (error == 0) 362 sc->vga_msi_child = child; 363 return (error); 364} 365 366static int 367vga_pci_alloc_msix(device_t dev, device_t child, int *count) 368{ 369 struct vga_pci_softc *sc; 370 int error; 371 372 sc = device_get_softc(dev); 373 if (sc->vga_msi_child != NULL) 374 return (EBUSY); 375 error = pci_alloc_msix(dev, count); 376 if (error == 0) 377 sc->vga_msi_child = child; 378 return (error); 379} 380 381static int 382vga_pci_remap_msix(device_t dev, device_t child, int count, 383 const u_int *vectors) 384{ 385 struct vga_pci_softc *sc; 386 387 sc = device_get_softc(dev); 388 if (sc->vga_msi_child != child) 389 return (ENXIO); 390 return (pci_remap_msix(dev, count, vectors)); 391} 392 393static int 394vga_pci_release_msi(device_t dev, device_t child) 395{ 396 struct vga_pci_softc *sc; 397 int error; 398 399 sc = device_get_softc(dev); 400 if (sc->vga_msi_child != child) 401 return (ENXIO); 402 error = pci_release_msi(dev); 403 if (error == 0) 404 sc->vga_msi_child = NULL; 405 return (error); 406} 407 408static int 409vga_pci_msi_count(device_t dev, device_t child) 410{ 411 412 return (pci_msi_count(dev)); 413} 414 415static int 416vga_pci_msix_count(device_t dev, device_t child) 417{ 418 419 return (pci_msix_count(dev)); 420} 421 422static bus_dma_tag_t 423vga_pci_get_dma_tag(device_t bus, device_t child) 424{ 425 426 return (bus_get_dma_tag(bus)); 427} 428 429static device_method_t vga_pci_methods[] = { 430 /* Device interface */ 431 DEVMETHOD(device_probe, vga_pci_probe), 432 DEVMETHOD(device_attach, vga_pci_attach), 433 DEVMETHOD(device_shutdown, bus_generic_shutdown), 434 DEVMETHOD(device_suspend, vga_pci_suspend), 435 DEVMETHOD(device_resume, vga_pci_resume), 436 437 /* Bus interface */ 438 DEVMETHOD(bus_read_ivar, vga_pci_read_ivar), 439 DEVMETHOD(bus_write_ivar, vga_pci_write_ivar), 440 DEVMETHOD(bus_setup_intr, vga_pci_setup_intr), 441 DEVMETHOD(bus_teardown_intr, vga_pci_teardown_intr), 442 DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource), 443 DEVMETHOD(bus_release_resource, vga_pci_release_resource), 444 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 445 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 446 DEVMETHOD(bus_get_dma_tag, vga_pci_get_dma_tag), 447 448 /* PCI interface */ 449 DEVMETHOD(pci_read_config, vga_pci_read_config), 450 DEVMETHOD(pci_write_config, vga_pci_write_config), 451 DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster), 452 DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster), 453 DEVMETHOD(pci_enable_io, vga_pci_enable_io), 454 DEVMETHOD(pci_disable_io, vga_pci_disable_io), 455 DEVMETHOD(pci_get_vpd_ident, vga_pci_get_vpd_ident), 456 DEVMETHOD(pci_get_vpd_readonly, vga_pci_get_vpd_readonly), 457 DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate), 458 DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate), 459 DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt), 460 DEVMETHOD(pci_find_cap, vga_pci_find_cap), 461 DEVMETHOD(pci_find_extcap, vga_pci_find_extcap), 462 DEVMETHOD(pci_find_htcap, vga_pci_find_htcap), 463 DEVMETHOD(pci_alloc_msi, vga_pci_alloc_msi), 464 DEVMETHOD(pci_alloc_msix, vga_pci_alloc_msix), 465 DEVMETHOD(pci_remap_msix, vga_pci_remap_msix), 466 DEVMETHOD(pci_release_msi, vga_pci_release_msi), 467 DEVMETHOD(pci_msi_count, vga_pci_msi_count), 468 DEVMETHOD(pci_msix_count, vga_pci_msix_count), 469 470 { 0, 0 } 471}; 472 473static driver_t vga_pci_driver = { 474 "vgapci", 475 vga_pci_methods, 476 sizeof(struct vga_pci_softc), 477}; 478 479static devclass_t vga_devclass; 480 481DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, 0, 0); 482