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: 91 return ("VIA 8385 host to PCI bridge"); 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 0x31881106: 129 case 0x31891106: 130 /* The newer VIA chipsets will select the AGP version based on 131 * what AGP versions the card supports. We still have to 132 * program it using the v2 registers if it has chosen to use 133 * compatibility mode. 134 */ 135 agpsel = pci_read_config(dev, AGP_VIA_AGPSEL, 1); 136 if ((agpsel & (1 << 1)) == 0) 137 sc->regs = via_v3_regs; 138 else 139 sc->regs = via_v2_regs; 140 break; 141 default: 142 sc->regs = via_v2_regs; 143 break; 144 } 145 146 error = agp_generic_attach(dev); 147 if (error) 148 return error; 149 150 sc->initial_aperture = AGP_GET_APERTURE(dev); 151 152 for (;;) { 153 gatt = agp_alloc_gatt(dev); 154 if (gatt) 155 break; 156 157 /* 158 * Probably contigmalloc failure. Try reducing the 159 * aperture so that the gatt size reduces. 160 */ 161 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) { 162 agp_generic_detach(dev); 163 return ENOMEM; 164 } 165 } 166 sc->gatt = gatt; 167 168 /* Install the gatt. */ 169 pci_write_config(dev, sc->regs[REG_ATTBASE], gatt->ag_physical | 3, 4); 170 171 /* Enable the aperture. */ 172 pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x0f, 4); 173 174 return 0; 175 } 176 177 static int 178 agp_via_detach(device_t dev) 179 { 180 struct agp_via_softc *sc = device_get_softc(dev); 181 int error; 182 183 error = agp_generic_detach(dev); 184 if (error) 185 return error; 186 187 pci_write_config(dev, sc->regs[REG_GARTCTRL], 0, 4); 188 pci_write_config(dev, sc->regs[REG_ATTBASE], 0, 4); 189 AGP_SET_APERTURE(dev, sc->initial_aperture); 190 agp_free_gatt(sc->gatt); 191 192 return 0; 193 } 194 195 static u_int32_t 196 agp_via_get_aperture(device_t dev) 197 { 198 struct agp_via_softc *sc = device_get_softc(dev); 199 u_int32_t apsize; 200 201 apsize = pci_read_config(dev, sc->regs[REG_APSIZE], 1) & 0x1f; 202 203 /* 204 * The size is determined by the number of low bits of 205 * register APBASE which are forced to zero. The low 20 bits 206 * are always forced to zero and each zero bit in the apsize 207 * field just read forces the corresponding bit in the 27:20 208 * to be zero. We calculate the aperture size accordingly. 209 */ 210 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1; 211 } 212 213 static int 214 agp_via_set_aperture(device_t dev, u_int32_t aperture) 215 { 216 struct agp_via_softc *sc = device_get_softc(dev); 217 u_int32_t apsize; 218 219 /* 220 * Reverse the magic from get_aperture. 221 */ 222 apsize = ((aperture - 1) >> 20) ^ 0xff; 223 224 /* 225 * Double check for sanity. 226 */ 227 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) 228 return EINVAL; 229 230 pci_write_config(dev, sc->regs[REG_APSIZE], apsize, 1); 231 232 return 0; 233 } 234 235 static int 236 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical) 237 { 238 struct agp_via_softc *sc = device_get_softc(dev); 239 240 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 241 return EINVAL; 242 243 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 244 return 0; 245 } 246 247 static int 248 agp_via_unbind_page(device_t dev, int offset) 249 { 250 struct agp_via_softc *sc = device_get_softc(dev); 251 252 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 253 return EINVAL; 254 255 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 256 return 0; 257 } 258 259 static void 260 agp_via_flush_tlb(device_t dev) 261 { 262 struct agp_via_softc *sc = device_get_softc(dev); 263 264 pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x8f, 4); 265 pci_write_config(dev, sc->regs[REG_GARTCTRL], 0x0f, 4); 266 } 267 268 static device_method_t agp_via_methods[] = { 269 /* Device interface */ 270 DEVMETHOD(device_probe, agp_via_probe), 271 DEVMETHOD(device_attach, agp_via_attach), 272 DEVMETHOD(device_detach, agp_via_detach), 273 DEVMETHOD(device_shutdown, bus_generic_shutdown), 274 DEVMETHOD(device_suspend, bus_generic_suspend), 275 DEVMETHOD(device_resume, bus_generic_resume), 276 277 /* AGP interface */ 278 DEVMETHOD(agp_get_aperture, agp_via_get_aperture), 279 DEVMETHOD(agp_set_aperture, agp_via_set_aperture), 280 DEVMETHOD(agp_bind_page, agp_via_bind_page), 281 DEVMETHOD(agp_unbind_page, agp_via_unbind_page), 282 DEVMETHOD(agp_flush_tlb, agp_via_flush_tlb), 283 DEVMETHOD(agp_enable, agp_generic_enable), 284 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory), 285 DEVMETHOD(agp_free_memory, agp_generic_free_memory), 286 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory), 287 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory), 288 289 { 0, 0 } 290 }; 291 292 static driver_t agp_via_driver = { 293 "agp", 294 agp_via_methods, 295 sizeof(struct agp_via_softc), 296 }; 297 298 static devclass_t agp_devclass; 299 300 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0); 301 MODULE_DEPEND(agp_via, agp, 1, 1, 1); 302 MODULE_DEPEND(agp_via, pci, 1, 1, 1); 303