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 SYSCTL_DECL(_hw_pci); 54 55 int vga_pci_default_unit = -1; 56 TUNABLE_INT("hw.pci.default_vgapci_unit", &vga_pci_default_unit); 57 SYSCTL_INT(_hw_pci, OID_AUTO, default_vgapci_unit, CTLFLAG_RD, 58 &vga_pci_default_unit, -1, "Default VGA-compatible display"); 59 60 int 61 vga_pci_is_boot_display(device_t dev) 62 { 63 64 /* 65 * Return true if the given device is the default display used 66 * at boot time. 67 */ 68 69 return ( 70 (pci_get_class(dev) == PCIC_DISPLAY || 71 (pci_get_class(dev) == PCIC_OLD && 72 pci_get_subclass(dev) == PCIS_OLD_VGA)) && 73 device_get_unit(dev) == vga_pci_default_unit); 74 } 75 76 void * 77 vga_pci_map_bios(device_t dev, size_t *size) 78 { 79 int rid; 80 struct resource *res; 81 82 if (vga_pci_is_boot_display(dev)) { 83 /* 84 * On x86, the System BIOS copy the default display 85 * device's Video BIOS at a fixed location in system 86 * memory (0xC0000, 128 kBytes long) at boot time. 87 * 88 * We use this copy for the default boot device, because 89 * the original ROM may not be valid after boot. 90 */ 91 92 *size = VGA_PCI_BIOS_SHADOW_SIZE; 93 return (pmap_mapbios(VGA_PCI_BIOS_SHADOW_ADDR, *size)); 94 } 95 96 rid = PCIR_BIOS; 97 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 98 if (res == NULL) { 99 return (NULL); 100 } 101 102 *size = rman_get_size(res); 103 return (rman_get_virtual(res)); 104 } 105 106 void 107 vga_pci_unmap_bios(device_t dev, void *bios) 108 { 109 int rid; 110 struct resource *res; 111 112 if (bios == NULL) { 113 return; 114 } 115 116 if (vga_pci_is_boot_display(dev)) { 117 /* We mapped the BIOS shadow copy located at 0xC0000. */ 118 pmap_unmapdev((vm_offset_t)bios, VGA_PCI_BIOS_SHADOW_SIZE); 119 120 return; 121 } 122 123 /* 124 * FIXME: We returned only the virtual address of the resource 125 * to the caller. Now, to get the resource struct back, we 126 * allocate it again: the struct exists once in memory in 127 * device softc. Therefore, we release twice now to release the 128 * reference we just obtained to get the structure back and the 129 * caller's reference. 130 */ 131 132 rid = PCIR_BIOS; 133 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 134 135 KASSERT(res != NULL, 136 ("%s: Can't get BIOS resource back", __func__)); 137 KASSERT(bios == rman_get_virtual(res), 138 ("%s: Given BIOS address doesn't match " 139 "resource virtual address", __func__)); 140 141 bus_release_resource(dev, SYS_RES_MEMORY, rid, bios); 142 bus_release_resource(dev, SYS_RES_MEMORY, rid, bios); 143 } 144 145 static int 146 vga_pci_probe(device_t dev) 147 { 148 device_t bdev; 149 int unit; 150 uint16_t bctl; 151 152 switch (pci_get_class(dev)) { 153 case PCIC_DISPLAY: 154 break; 155 case PCIC_OLD: 156 if (pci_get_subclass(dev) != PCIS_OLD_VGA) 157 return (ENXIO); 158 break; 159 default: 160 return (ENXIO); 161 } 162 163 /* Probe default display. */ 164 unit = device_get_unit(dev); 165 bdev = device_get_parent(device_get_parent(dev)); 166 bctl = pci_read_config(bdev, PCIR_BRIDGECTL_1, 2); 167 if (vga_pci_default_unit < 0 && (bctl & PCIB_BCR_VGA_ENABLE) != 0) 168 vga_pci_default_unit = unit; 169 if (vga_pci_default_unit == unit) 170 device_set_flags(dev, 1); 171 172 device_set_desc(dev, "VGA-compatible display"); 173 return (BUS_PROBE_GENERIC); 174 } 175 176 static int 177 vga_pci_attach(device_t dev) 178 { 179 180 bus_generic_probe(dev); 181 182 /* Always create a drm child for now to make it easier on drm. */ 183 device_add_child(dev, "drm", -1); 184 device_add_child(dev, "drmn", -1); 185 bus_generic_attach(dev); 186 return (0); 187 } 188 189 static int 190 vga_pci_suspend(device_t dev) 191 { 192 193 return (bus_generic_suspend(dev)); 194 } 195 196 static int 197 vga_pci_resume(device_t dev) 198 { 199 200 return (bus_generic_resume(dev)); 201 } 202 203 /* Bus interface. */ 204 205 static int 206 vga_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 207 { 208 209 return (BUS_READ_IVAR(device_get_parent(dev), dev, which, result)); 210 } 211 212 static int 213 vga_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 214 { 215 216 return (EINVAL); 217 } 218 219 static struct resource * 220 vga_pci_alloc_resource(device_t dev, device_t child, int type, int *rid, 221 u_long start, u_long end, u_long count, u_int flags, int cpuid __unused) 222 { 223 224 return (bus_alloc_resource(dev, type, rid, start, end, count, flags)); 225 } 226 227 static int 228 vga_pci_release_resource(device_t dev, device_t child, int type, int rid, 229 struct resource *r) 230 { 231 232 return (bus_release_resource(dev, type, rid, r)); 233 } 234 235 /* PCI interface. */ 236 237 static uint32_t 238 vga_pci_read_config(device_t dev, device_t child, int reg, int width) 239 { 240 241 return (pci_read_config(dev, reg, width)); 242 } 243 244 static void 245 vga_pci_write_config(device_t dev, device_t child, int reg, 246 uint32_t val, int width) 247 { 248 249 pci_write_config(dev, reg, val, width); 250 } 251 252 static int 253 vga_pci_enable_busmaster(device_t dev, device_t child) 254 { 255 256 device_printf(dev, "child %s requested pci_enable_busmaster\n", 257 device_get_nameunit(child)); 258 return (pci_enable_busmaster(dev)); 259 } 260 261 static int 262 vga_pci_disable_busmaster(device_t dev, device_t child) 263 { 264 265 device_printf(dev, "child %s requested pci_disable_busmaster\n", 266 device_get_nameunit(child)); 267 return (pci_disable_busmaster(dev)); 268 } 269 270 static int 271 vga_pci_enable_io(device_t dev, device_t child, int space) 272 { 273 274 device_printf(dev, "child %s requested pci_enable_io\n", 275 device_get_nameunit(child)); 276 return (pci_enable_io(dev, space)); 277 } 278 279 static int 280 vga_pci_disable_io(device_t dev, device_t child, int space) 281 { 282 283 device_printf(dev, "child %s requested pci_disable_io\n", 284 device_get_nameunit(child)); 285 return (pci_disable_io(dev, space)); 286 } 287 288 static int 289 vga_pci_set_powerstate(device_t dev, device_t child, int state) 290 { 291 292 device_printf(dev, "child %s requested pci_set_powerstate\n", 293 device_get_nameunit(child)); 294 return (pci_set_powerstate(dev, state)); 295 } 296 297 static int 298 vga_pci_get_powerstate(device_t dev, device_t child) 299 { 300 301 device_printf(dev, "child %s requested pci_get_powerstate\n", 302 device_get_nameunit(child)); 303 return (pci_get_powerstate(dev)); 304 } 305 306 static int 307 vga_pci_assign_interrupt(device_t dev, device_t child) 308 { 309 310 device_printf(dev, "child %s requested pci_assign_interrupt\n", 311 device_get_nameunit(child)); 312 return (PCI_ASSIGN_INTERRUPT(device_get_parent(dev), dev)); 313 } 314 315 static int 316 vga_pci_find_extcap(device_t dev, device_t child, int capability, 317 int *capreg) 318 { 319 320 return (pci_find_extcap(dev, capability, capreg)); 321 } 322 323 static device_method_t vga_pci_methods[] = { 324 /* Device interface */ 325 DEVMETHOD(device_probe, vga_pci_probe), 326 DEVMETHOD(device_attach, vga_pci_attach), 327 DEVMETHOD(device_shutdown, bus_generic_shutdown), 328 DEVMETHOD(device_suspend, vga_pci_suspend), 329 DEVMETHOD(device_resume, vga_pci_resume), 330 331 /* Bus interface */ 332 DEVMETHOD(bus_read_ivar, vga_pci_read_ivar), 333 DEVMETHOD(bus_write_ivar, vga_pci_write_ivar), 334 DEVMETHOD(bus_setup_intr, bus_generic_setup_intr), 335 DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr), 336 337 DEVMETHOD(bus_alloc_resource, vga_pci_alloc_resource), 338 DEVMETHOD(bus_release_resource, vga_pci_release_resource), 339 DEVMETHOD(bus_activate_resource, bus_generic_activate_resource), 340 DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource), 341 342 /* PCI interface */ 343 DEVMETHOD(pci_read_config, vga_pci_read_config), 344 DEVMETHOD(pci_write_config, vga_pci_write_config), 345 DEVMETHOD(pci_enable_busmaster, vga_pci_enable_busmaster), 346 DEVMETHOD(pci_disable_busmaster, vga_pci_disable_busmaster), 347 DEVMETHOD(pci_enable_io, vga_pci_enable_io), 348 DEVMETHOD(pci_disable_io, vga_pci_disable_io), 349 DEVMETHOD(pci_get_powerstate, vga_pci_get_powerstate), 350 DEVMETHOD(pci_set_powerstate, vga_pci_set_powerstate), 351 DEVMETHOD(pci_assign_interrupt, vga_pci_assign_interrupt), 352 DEVMETHOD(pci_find_extcap, vga_pci_find_extcap), 353 354 DEVMETHOD_END 355 }; 356 357 static driver_t vga_pci_driver = { 358 "vgapci", 359 vga_pci_methods, 360 1, 361 }; 362 363 static devclass_t vga_devclass; 364 365 DRIVER_MODULE(vgapci, pci, vga_pci_driver, vga_devclass, NULL, NULL); 366