1 /*- 2 * Copyright (c) 2000 Doug Rabson 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_bus.h" 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/malloc.h> 35 #include <sys/kernel.h> 36 #include <sys/module.h> 37 #include <sys/bus.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 42 #include <dev/pci/pcivar.h> 43 #include <dev/pci/pcireg.h> 44 #include <pci/agppriv.h> 45 #include <pci/agpreg.h> 46 47 #include <vm/vm.h> 48 #include <vm/vm_object.h> 49 #include <vm/pmap.h> 50 51 #define REG_GARTCTRL 0 52 #define REG_APSIZE 1 53 #define REG_ATTBASE 2 54 55 struct agp_via_softc { 56 struct agp_softc agp; 57 u_int32_t initial_aperture; /* aperture size at startup */ 58 struct agp_gatt *gatt; 59 int *regs; 60 }; 61 62 static int via_v2_regs[] = { AGP_VIA_GARTCTRL, AGP_VIA_APSIZE, 63 AGP_VIA_ATTBASE }; 64 static int via_v3_regs[] = { AGP3_VIA_GARTCTRL, AGP3_VIA_APSIZE, 65 AGP3_VIA_ATTBASE }; 66 67 static const char* 68 agp_via_match(device_t dev) 69 { 70 if (pci_get_class(dev) != PCIC_BRIDGE 71 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST) 72 return NULL; 73 74 if (agp_find_caps(dev) == 0) 75 return NULL; 76 77 switch (pci_get_devid(dev)) { 78 case 0x03051106: 79 return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge"); 80 case 0x05011106: 81 return ("VIA 8501 (Apollo MVP4) host to PCI bridge"); 82 case 0x05971106: 83 return ("VIA 82C597 (Apollo VP3) host to PCI bridge"); 84 case 0x05981106: 85 return ("VIA 82C598 (Apollo MVP3) host to PCI bridge"); 86 case 0x06051106: 87 return ("VIA 82C694X (Apollo Pro 133A) host to PCI bridge"); 88 case 0x06911106: 89 return ("VIA 82C691 (Apollo Pro) host to PCI bridge"); 90 case 0x31881106: /* AMD64 GART */ 91 return NULL; 92 case 0x31891106: 93 return ("VIA 8377 (Apollo KT400/KT400A/KT600) host to PCI bridge"); 94 }; 95 96 if (pci_get_vendor(dev) == 0x1106) 97 return ("VIA Generic host to PCI bridge"); 98 99 return NULL; 100 } 101 102 static int 103 agp_via_probe(device_t dev) 104 { 105 const char *desc; 106 107 if (resource_disabled("agp", device_get_unit(dev))) 108 return (ENXIO); 109 desc = agp_via_match(dev); 110 if (desc) { 111 device_verbose(dev); 112 device_set_desc(dev, desc); 113 return 0; 114 } 115 116 return ENXIO; 117 } 118 119 static int 120 agp_via_attach(device_t dev) 121 { 122 struct agp_via_softc *sc = device_get_softc(dev); 123 struct agp_gatt *gatt; 124 int error; 125 u_int32_t agpsel; 126 127 switch (pci_get_devid(dev)) { 128 case 0x31891106: 129 /* The newer VIA chipsets will select the AGP version based on 130 * what AGP versions the card supports. We still have to 131 * program it using the v2 registers if it has chosen to use 132 * compatibility mode. 133 */ 134 agpsel = pci_read_config(dev, AGP_VIA_AGPSEL, 1); 135 if ((agpsel & (1 << 1)) == 0) 136 sc->regs = via_v3_regs; 137 else 138 sc->regs = via_v2_regs; 139 break; 140 default: 141 sc->regs = via_v2_regs; 142 break; 143 } 144 145 error = agp_generic_attach(dev); 146 if (error) 147 return error; 148 149 sc->initial_aperture = AGP_GET_APERTURE(dev); 150 151 for (;;) { 152 gatt = agp_alloc_gatt(dev); 153 if (gatt) 154 break; 155 156 /* 157 * Probably contigmalloc failure. Try reducing the 158 * aperture so that the gatt size reduces. 159 */ 160 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) { 161 agp_generic_detach(dev); 162 return ENOMEM; 163 } 164 } 165 sc->gatt = gatt; 166 167 /* Install the gatt. */ 168 pci_write_config(dev, sc->regs[REG_ATTBASE], gatt->ag_physical | 3, 4); 169 170 /* Enable the aperture. */ 171 pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x0f, 4); 172 173 return 0; 174 } 175 176 static int 177 agp_via_detach(device_t dev) 178 { 179 struct agp_via_softc *sc = device_get_softc(dev); 180 int error; 181 182 error = agp_generic_detach(dev); 183 if (error) 184 return error; 185 186 pci_write_config(dev, sc->regs[REG_GARTCTRL], 0, 4); 187 pci_write_config(dev, sc->regs[REG_ATTBASE], 0, 4); 188 AGP_SET_APERTURE(dev, sc->initial_aperture); 189 agp_free_gatt(sc->gatt); 190 191 return 0; 192 } 193 194 static u_int32_t 195 agp_via_get_aperture(device_t dev) 196 { 197 struct agp_via_softc *sc = device_get_softc(dev); 198 u_int32_t apsize; 199 200 apsize = pci_read_config(dev, sc->regs[REG_APSIZE], 1) & 0x1f; 201 202 /* 203 * The size is determined by the number of low bits of 204 * register APBASE which are forced to zero. The low 20 bits 205 * are always forced to zero and each zero bit in the apsize 206 * field just read forces the corresponding bit in the 27:20 207 * to be zero. We calculate the aperture size accordingly. 208 */ 209 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1; 210 } 211 212 static int 213 agp_via_set_aperture(device_t dev, u_int32_t aperture) 214 { 215 struct agp_via_softc *sc = device_get_softc(dev); 216 u_int32_t apsize; 217 218 /* 219 * Reverse the magic from get_aperture. 220 */ 221 apsize = ((aperture - 1) >> 20) ^ 0xff; 222 223 /* 224 * Double check for sanity. 225 */ 226 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) 227 return EINVAL; 228 229 pci_write_config(dev, sc->regs[REG_APSIZE], apsize, 1); 230 231 return 0; 232 } 233 234 static int 235 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical) 236 { 237 struct agp_via_softc *sc = device_get_softc(dev); 238 239 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 240 return EINVAL; 241 242 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 243 return 0; 244 } 245 246 static int 247 agp_via_unbind_page(device_t dev, int offset) 248 { 249 struct agp_via_softc *sc = device_get_softc(dev); 250 251 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 252 return EINVAL; 253 254 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 255 return 0; 256 } 257 258 static void 259 agp_via_flush_tlb(device_t dev) 260 { 261 struct agp_via_softc *sc = device_get_softc(dev); 262 263 pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x8f, 4); 264 pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x0f, 4); 265 } 266 267 static device_method_t agp_via_methods[] = { 268 /* Device interface */ 269 DEVMETHOD(device_probe, agp_via_probe), 270 DEVMETHOD(device_attach, agp_via_attach), 271 DEVMETHOD(device_detach, agp_via_detach), 272 DEVMETHOD(device_shutdown, bus_generic_shutdown), 273 DEVMETHOD(device_suspend, bus_generic_suspend), 274 DEVMETHOD(device_resume, bus_generic_resume), 275 276 /* AGP interface */ 277 DEVMETHOD(agp_get_aperture, agp_via_get_aperture), 278 DEVMETHOD(agp_set_aperture, agp_via_set_aperture), 279 DEVMETHOD(agp_bind_page, agp_via_bind_page), 280 DEVMETHOD(agp_unbind_page, agp_via_unbind_page), 281 DEVMETHOD(agp_flush_tlb, agp_via_flush_tlb), 282 DEVMETHOD(agp_enable, agp_generic_enable), 283 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory), 284 DEVMETHOD(agp_free_memory, agp_generic_free_memory), 285 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory), 286 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory), 287 288 { 0, 0 } 289 }; 290 291 static driver_t agp_via_driver = { 292 "agp", 293 agp_via_methods, 294 sizeof(struct agp_via_softc), 295 }; 296 297 static devclass_t agp_devclass; 298 299 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0); 300 MODULE_DEPEND(agp_via, agp, 1, 1, 1); 301 MODULE_DEPEND(agp_via, pci, 1, 1, 1); 302