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 * $FreeBSD: src/sys/pci/agp_via.c,v 1.1.2.2 2001/10/04 09:53:04 ru Exp $ 27 * $DragonFly: src/sys/dev/agp/agp_via.c,v 1.3 2003/08/07 21:16:48 dillon Exp $ 28 */ 29 30 #include "opt_bus.h" 31 #include "opt_pci.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/malloc.h> 36 #include <sys/kernel.h> 37 #include <sys/bus.h> 38 #include <sys/lock.h> 39 40 #include <bus/pci/pcivar.h> 41 #include <bus/pci/pcireg.h> 42 #include "agppriv.h" 43 #include "agpreg.h" 44 45 #include <vm/vm.h> 46 #include <vm/vm_object.h> 47 #include <vm/pmap.h> 48 49 struct agp_via_softc { 50 struct agp_softc agp; 51 u_int32_t initial_aperture; /* aperture size at startup */ 52 struct agp_gatt *gatt; 53 }; 54 55 static const char* 56 agp_via_match(device_t dev) 57 { 58 if (pci_get_class(dev) != PCIC_BRIDGE 59 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST) 60 return NULL; 61 62 if (agp_find_caps(dev) == 0) 63 return NULL; 64 65 switch (pci_get_devid(dev)) { 66 case 0x05011106: 67 return ("VIA 8501 (Apollo MVP4) host to PCI bridge"); 68 case 0x05971106: 69 return ("VIA 82C597 (Apollo VP3) host to PCI bridge"); 70 case 0x05981106: 71 return ("VIA 82C598 (Apollo MVP3) host to PCI bridge"); 72 case 0x06911106: 73 return ("VIA 82C691 (Apollo Pro) host to PCI bridge"); 74 case 0x03051106: 75 return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge"); 76 }; 77 78 if (pci_get_vendor(dev) == 0x1106) 79 return ("VIA Generic host to PCI bridge"); 80 81 return NULL; 82 } 83 84 static int 85 agp_via_probe(device_t dev) 86 { 87 const char *desc; 88 89 desc = agp_via_match(dev); 90 if (desc) { 91 device_verbose(dev); 92 device_set_desc(dev, desc); 93 return 0; 94 } 95 96 return ENXIO; 97 } 98 99 static int 100 agp_via_attach(device_t dev) 101 { 102 struct agp_via_softc *sc = device_get_softc(dev); 103 struct agp_gatt *gatt; 104 int error; 105 106 error = agp_generic_attach(dev); 107 if (error) 108 return error; 109 110 sc->initial_aperture = AGP_GET_APERTURE(dev); 111 112 for (;;) { 113 gatt = agp_alloc_gatt(dev); 114 if (gatt) 115 break; 116 117 /* 118 * Probably contigmalloc failure. Try reducing the 119 * aperture so that the gatt size reduces. 120 */ 121 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) { 122 agp_generic_detach(dev); 123 return ENOMEM; 124 } 125 } 126 sc->gatt = gatt; 127 128 /* Install the gatt. */ 129 pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4); 130 131 /* Enable the aperture. */ 132 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4); 133 134 return 0; 135 } 136 137 static int 138 agp_via_detach(device_t dev) 139 { 140 struct agp_via_softc *sc = device_get_softc(dev); 141 int error; 142 143 error = agp_generic_detach(dev); 144 if (error) 145 return error; 146 147 pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4); 148 pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4); 149 AGP_SET_APERTURE(dev, sc->initial_aperture); 150 agp_free_gatt(sc->gatt); 151 152 return 0; 153 } 154 155 static u_int32_t 156 agp_via_get_aperture(device_t dev) 157 { 158 u_int32_t apsize; 159 160 apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f; 161 162 /* 163 * The size is determined by the number of low bits of 164 * register APBASE which are forced to zero. The low 20 bits 165 * are always forced to zero and each zero bit in the apsize 166 * field just read forces the corresponding bit in the 27:20 167 * to be zero. We calculate the aperture size accordingly. 168 */ 169 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1; 170 } 171 172 static int 173 agp_via_set_aperture(device_t dev, u_int32_t aperture) 174 { 175 u_int32_t apsize; 176 177 /* 178 * Reverse the magic from get_aperture. 179 */ 180 apsize = ((aperture - 1) >> 20) ^ 0xff; 181 182 /* 183 * Double check for sanity. 184 */ 185 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) 186 return EINVAL; 187 188 pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1); 189 190 return 0; 191 } 192 193 static int 194 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical) 195 { 196 struct agp_via_softc *sc = device_get_softc(dev); 197 198 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 199 return EINVAL; 200 201 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 202 return 0; 203 } 204 205 static int 206 agp_via_unbind_page(device_t dev, int offset) 207 { 208 struct agp_via_softc *sc = device_get_softc(dev); 209 210 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 211 return EINVAL; 212 213 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 214 return 0; 215 } 216 217 static void 218 agp_via_flush_tlb(device_t dev) 219 { 220 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4); 221 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4); 222 } 223 224 static device_method_t agp_via_methods[] = { 225 /* Device interface */ 226 DEVMETHOD(device_probe, agp_via_probe), 227 DEVMETHOD(device_attach, agp_via_attach), 228 DEVMETHOD(device_detach, agp_via_detach), 229 DEVMETHOD(device_shutdown, bus_generic_shutdown), 230 DEVMETHOD(device_suspend, bus_generic_suspend), 231 DEVMETHOD(device_resume, bus_generic_resume), 232 233 /* AGP interface */ 234 DEVMETHOD(agp_get_aperture, agp_via_get_aperture), 235 DEVMETHOD(agp_set_aperture, agp_via_set_aperture), 236 DEVMETHOD(agp_bind_page, agp_via_bind_page), 237 DEVMETHOD(agp_unbind_page, agp_via_unbind_page), 238 DEVMETHOD(agp_flush_tlb, agp_via_flush_tlb), 239 DEVMETHOD(agp_enable, agp_generic_enable), 240 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory), 241 DEVMETHOD(agp_free_memory, agp_generic_free_memory), 242 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory), 243 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory), 244 245 { 0, 0 } 246 }; 247 248 static driver_t agp_via_driver = { 249 "agp", 250 agp_via_methods, 251 sizeof(struct agp_via_softc), 252 }; 253 254 static devclass_t agp_devclass; 255 256 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0); 257