vga_pci.c revision 232472
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 30#include <sys/cdefs.h> 31__FBSDID("$FreeBSD: head/sys/dev/pci/vga_pci.c 232472 2012-03-03 18:08:57Z jhb $"); 32 33/* 34 * Simple driver for PCI VGA display devices. Drivers such as agp(4) and 35 * drm(4) should attach as children of this device. 36 * 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_res[PCIR_MAX_BAR_0 + 1]; 60}; 61 62SYSCTL_DECL(_hw_pci); 63 64int vga_pci_default_unit = -1; 65TUNABLE_INT("hw.pci.default_vgapci_unit", &vga_pci_default_unit); 66SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RDTUN, 67 &vga_pci_default_unit, -1, "Default VGA-compatible display"); 68 69static int 70vga_pci_probe(device_t dev) 71{ 72 device_t bdev; 73 int unit; 74 uint16_t bctl; 75 76 switch (pci_get_class(dev)) { 77 case PCIC_DISPLAY: 78 break; 79 case PCIC_OLD: 80 if (pci_get_subclass(dev) != PCIS_OLD_VGA) 81 return (ENXIO); 82 break; 83 default: 84 return (ENXIO); 85 } 86 87 /* Probe default display. */ 88 unit = device_get_unit(dev); 89 bdev = device_get_parent(device_get_parent(dev)); 90 bctl = pci_read_config(bdev, PCIR_BRIDGECTL_1, 2); 91 if (vga_pci_default_unit < 0 && (bctl & PCIB_BCR_VGA_ENABLE) != 0) 92 vga_pci_default_unit = unit; 93 if (vga_pci_default_unit == unit) 94 device_set_flags(dev, 1); 95 96 device_set_desc(dev, "VGA-compatible display"); 97 return (BUS_PROBE_GENERIC); 98} 99 100static int 101vga_pci_attach(device_t dev) 102{ 103 104 bus_generic_probe(dev); 105 106 /* Always create a drm child for now to make it easier on drm. */ 107 device_add_child(dev, "drm", -1); 108 bus_generic_attach(dev); 109 return (0); 110} 111 112static int 113vga_pci_suspend(device_t dev) 114{ 115 116 return (bus_generic_suspend(dev)); 117} 118 119static int 120vga_pci_resume(device_t dev) 121{ 122 123 return (bus_generic_resume(dev)); 124} 125 126/* Bus interface. */ 127 128static int 129vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 130{ 131 132 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result)); 133} 134 135static int 136vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 137{ 138 139 return (EINVAL); 140} 141 142static int 143vga_pci_setup_intr(device_t dev, device_t child, struct resource *irq, 144 int flags, driver_filter_t *filter, driver_intr_t *intr, void *arg, 145 void **cookiep) 146{ 147 return (BUS_SETUP_INTR(device_get_parent(dev), dev, irq, flags, 148 filter, intr, arg, cookiep)); 149} 150 151static int 152vga_pci_teardown_intr(device_t dev, device_t child, struct resource *irq, 153 void *cookie) 154{ 155 return (BUS_TEARDOWN_INTR(device_get_parent(dev), dev, irq, cookie)); 156} 157 158static struct resource * 159vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid, 160 u_long start, u_long end, u_long count, u_int flags) 161{ 162 struct vga_pci_softc *sc; 163 int bar; 164 165 switch (type) { 166 case SYS_RES_MEMORY: 167 case SYS_RES_IOPORT: 168 /* 169 * For BARs, we cache the resource so that we only allocate it 170 * from the PCI bus once. 171 */ 172 bar = PCI_RID2BAR(*rid); 173 if (bar < 0 || bar > PCIR_MAX_BAR_0) 174 return (NULL); 175 sc = device_get_softc(dev); 176 if (sc->vga_res[bar].vr_res == NULL) 177 sc->vga_res[bar].vr_res = bus_alloc_resource(dev, type, 178 rid, start, end, count, flags); 179 if (sc->vga_res[bar].vr_res != NULL) 180 sc->vga_res[bar].vr_refs++; 181 return (sc->vga_res[bar].vr_res); 182 } 183 return (bus_alloc_resource(dev, type, rid, start, end, count, flags)); 184} 185 186static int 187vga_pci_release_resource(device_t dev, device_t child, int type, int rid, 188 struct resource *r) 189{ 190 struct vga_pci_softc *sc; 191 int bar, error; 192 193 switch (type) { 194 case SYS_RES_MEMORY: 195 case SYS_RES_IOPORT: 196 /* 197 * For BARs, we release the resource from the PCI bus 198 * when the last child reference goes away. 199 */ 200 bar = PCI_RID2BAR(rid); 201 if (bar < 0 || bar > PCIR_MAX_BAR_0) 202 return (EINVAL); 203 sc = device_get_softc(dev); 204 if (sc->vga_res[bar].vr_res == NULL) 205 return (EINVAL); 206 KASSERT(sc->vga_res[bar].vr_res == r, 207 ("vga_pci resource mismatch")); 208 if (sc->vga_res[bar].vr_refs > 1) { 209 sc->vga_res[bar].vr_refs--; 210 return (0); 211 } 212 KASSERT(sc->vga_res[bar].vr_refs > 0, 213 ("vga_pci resource reference count underflow")); 214 error = bus_release_resource(dev, type, rid, r); 215 if (error == 0) { 216 sc->vga_res[bar].vr_res = NULL; 217 sc->vga_res[bar].vr_refs = 0; 218 } 219 return (error); 220 } 221 222 return (bus_release_resource(dev, type, rid, r)); 223} 224 225/* PCI interface. */ 226 227static uint32_t 228vga_pci_read_config(device_t dev, device_t child, int reg, int width) 229{ 230 231 return (pci_read_config(dev, reg, width)); 232} 233 234static void 235vga_pci_write_config(device_t dev, device_t child, int reg, 236 uint32_t val, int width) 237{ 238 239 pci_write_config(dev, reg, val, width); 240} 241 242static int 243vga_pci_enable_busmaster(device_t dev, device_t child) 244{ 245 246 return (pci_enable_busmaster(dev)); 247} 248 249static int 250vga_pci_disable_busmaster(device_t dev, device_t child) 251{ 252 253 return (pci_disable_busmaster(dev)); 254} 255 256static int 257vga_pci_enable_io(device_t dev, device_t child, int space) 258{ 259 260 device_printf(dev, "child %s requested pci_enable_io\n", 261 device_get_nameunit(child)); 262 return (pci_enable_io(dev, space)); 263} 264 265static int 266vga_pci_disable_io(device_t dev, device_t child, int space) 267{ 268 269 device_printf(dev, "child %s requested pci_disable_io\n", 270 device_get_nameunit(child)); 271 return (pci_disable_io(dev, space)); 272} 273 274static int 275vga_pci_get_vpd_ident(device_t dev, device_t child, const char **identptr) 276{ 277 278 return (pci_get_vpd_ident(dev, identptr)); 279} 280 281static int 282vga_pci_get_vpd_readonly(device_t dev, device_t child, const char *kw, 283 const char **vptr) 284{ 285 286 return (pci_get_vpd_readonly(dev, kw, vptr)); 287} 288 289static int 290vga_pci_set_powerstate(device_t dev, device_t child, int state) 291{ 292 293 device_printf(dev, "child %s requested pci_set_powerstate\n", 294 device_get_nameunit(child)); 295 return (pci_set_powerstate(dev, state)); 296} 297 298static int 299vga_pci_get_powerstate(device_t dev, device_t child) 300{ 301 302 device_printf(dev, "child %s requested pci_get_powerstate\n", 303 device_get_nameunit(child)); 304 return (pci_get_powerstate(dev)); 305} 306 307static int 308vga_pci_assign_interrupt(device_t dev, device_t child) 309{ 310 311 device_printf(dev, "child %s requested pci_assign_interrupt\n", 312 device_get_nameunit(child)); 313 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev)); 314} 315 316static int 317vga_pci_find_cap(device_t dev, device_t child, int capability, 318 int *capreg) 319{ 320 321 return (pci_find_cap(dev, capability, capreg)); 322} 323 324static int 325vga_pci_find_extcap(device_t dev, device_t child, int capability, 326 int *capreg) 327{ 328 329 return (pci_find_extcap(dev, capability, capreg)); 330} 331 332static int 333vga_pci_find_htcap(device_t dev, device_t child, int capability, 334 int *capreg) 335{ 336 337 return (pci_find_htcap(dev, capability, capreg)); 338} 339 340static int 341vga_pci_alloc_msi(device_t dev, device_t child, int *count) 342{ 343 struct vga_pci_softc *sc; 344 int error; 345 346 sc = device_get_softc(dev); 347 if (sc->vga_msi_child != NULL) 348 return (EBUSY); 349 error = pci_alloc_msi(dev, count); 350 if (error == 0) 351 sc->vga_msi_child = child; 352 return (error); 353} 354 355static int 356vga_pci_alloc_msix(device_t dev, device_t child, int *count) 357{ 358 struct vga_pci_softc *sc; 359 int error; 360 361 sc = device_get_softc(dev); 362 if (sc->vga_msi_child != NULL) 363 return (EBUSY); 364 error = pci_alloc_msix(dev, count); 365 if (error == 0) 366 sc->vga_msi_child = child; 367 return (error); 368} 369 370static int 371vga_pci_remap_msix(device_t dev, device_t child, int count, 372 const u_int *vectors) 373{ 374 struct vga_pci_softc *sc; 375 376 sc = device_get_softc(dev); 377 if (sc->vga_msi_child != child) 378 return (ENXIO); 379 return (pci_remap_msix(dev, count, vectors)); 380} 381 382static int 383vga_pci_release_msi(device_t dev, device_t child) 384{ 385 struct vga_pci_softc *sc; 386 int error; 387 388 sc = device_get_softc(dev); 389 if (sc->vga_msi_child != child) 390 return (ENXIO); 391 error = pci_release_msi(dev); 392 if (error == 0) 393 sc->vga_msi_child = NULL; 394 return (error); 395} 396 397static int 398vga_pci_msi_count(device_t dev, device_t child) 399{ 400 401 return (pci_msi_count(dev)); 402} 403 404static int 405vga_pci_msix_count(device_t dev, device_t child) 406{ 407 408 return (pci_msix_count(dev)); 409} 410 411static device_method_t vga_pci_methods[] = { 412 /* Device interface */ 413 DEVMETHOD(device_probe, vga_pci_probe), 414 DEVMETHOD(device_attach, vga_pci_attach), 415 DEVMETHOD(device_shutdown, bus_generic_shutdown), 416 DEVMETHOD(device_suspend, vga_pci_suspend), 417 DEVMETHOD(device_resume, vga_pci_resume), 418 419 /* Bus interface */ 420 DEVMETHOD(bus_read_ivar, vga_pci_read_ivar), 421 DEVMETHOD(bus_write_ivar, vga_pci_write_ivar), 422 DEVMETHOD(bus_setup_intr, vga_pci_setup_intr), 423 DEVMETHOD(bus_teardown_intr, vga_pci_teardown_intr), 424 DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource), 425 DEVMETHOD(bus_release_resource, vga_pci_release_resource), 426 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 427 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 428 429 /* PCI interface */ 430 DEVMETHOD(pci_read_config, vga_pci_read_config), 431 DEVMETHOD(pci_write_config, vga_pci_write_config), 432 DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster), 433 DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster), 434 DEVMETHOD(pci_enable_io, vga_pci_enable_io), 435 DEVMETHOD(pci_disable_io, vga_pci_disable_io), 436 DEVMETHOD(pci_get_vpd_ident, vga_pci_get_vpd_ident), 437 DEVMETHOD(pci_get_vpd_readonly, vga_pci_get_vpd_readonly), 438 DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate), 439 DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate), 440 DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt), 441 DEVMETHOD(pci_find_cap, vga_pci_find_cap), 442 DEVMETHOD(pci_find_extcap, vga_pci_find_extcap), 443 DEVMETHOD(pci_find_htcap, vga_pci_find_htcap), 444 DEVMETHOD(pci_alloc_msi, vga_pci_alloc_msi), 445 DEVMETHOD(pci_alloc_msix, vga_pci_alloc_msix), 446 DEVMETHOD(pci_remap_msix, vga_pci_remap_msix), 447 DEVMETHOD(pci_release_msi, vga_pci_release_msi), 448 DEVMETHOD(pci_msi_count, vga_pci_msi_count), 449 DEVMETHOD(pci_msix_count, vga_pci_msix_count), 450 451 { 0, 0 } 452}; 453 454static driver_t vga_pci_driver = { 455 "vgapci", 456 vga_pci_methods, 457 sizeof(struct vga_pci_softc), 458}; 459 460static devclass_t vga_devclass; 461 462DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, 0, 0); 463