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 * $FreeBSD$ 27 */ 28 29 #include "opt_bus.h" 30 #include "opt_pci.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/bus.h> 37 #include <sys/lock.h> 38 #include <sys/lockmgr.h> 39 #include <sys/mutex.h> 40 #include <sys/proc.h> 41 42 #include <pci/pcivar.h> 43 #include <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 struct agp_via_softc { 52 struct agp_softc agp; 53 u_int32_t initial_aperture; /* aperture size at startup */ 54 struct agp_gatt *gatt; 55 }; 56 57 static const char* 58 agp_via_match(device_t dev) 59 { 60 if (pci_get_class(dev) != PCIC_BRIDGE 61 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST) 62 return NULL; 63 64 if (agp_find_caps(dev) == 0) 65 return NULL; 66 67 switch (pci_get_devid(dev)) { 68 case 0x05011106: 69 return ("VIA 8501 (Apollo MVP4) host to PCI bridge"); 70 case 0x05971106: 71 return ("VIA 82C597 (Apollo VP3) host to PCI bridge"); 72 case 0x05981106: 73 return ("VIA 82C598 (Apollo MVP3) host to PCI bridge"); 74 case 0x06911106: 75 return ("VIA 82C691 (Apollo Pro) host to PCI bridge"); 76 case 0x03051106: 77 return ("VIA 82C8363 (Apollo KT133A) host to PCI bridge"); 78 }; 79 80 if (pci_get_vendor(dev) == 0x1106) 81 return ("VIA Generic host to PCI bridge"); 82 83 return NULL; 84 } 85 86 static int 87 agp_via_probe(device_t dev) 88 { 89 const char *desc; 90 91 desc = agp_via_match(dev); 92 if (desc) { 93 device_verbose(dev); 94 device_set_desc(dev, desc); 95 return 0; 96 } 97 98 return ENXIO; 99 } 100 101 static int 102 agp_via_attach(device_t dev) 103 { 104 struct agp_via_softc *sc = device_get_softc(dev); 105 struct agp_gatt *gatt; 106 int error; 107 108 error = agp_generic_attach(dev); 109 if (error) 110 return error; 111 112 sc->initial_aperture = AGP_GET_APERTURE(dev); 113 114 for (;;) { 115 gatt = agp_alloc_gatt(dev); 116 if (gatt) 117 break; 118 119 /* 120 * Probably contigmalloc failure. Try reducing the 121 * aperture so that the gatt size reduces. 122 */ 123 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) { 124 agp_generic_detach(dev); 125 return ENOMEM; 126 } 127 } 128 sc->gatt = gatt; 129 130 /* Install the gatt. */ 131 pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4); 132 133 /* Enable the aperture. */ 134 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4); 135 136 return 0; 137 } 138 139 static int 140 agp_via_detach(device_t dev) 141 { 142 struct agp_via_softc *sc = device_get_softc(dev); 143 int error; 144 145 error = agp_generic_detach(dev); 146 if (error) 147 return error; 148 149 pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4); 150 pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4); 151 AGP_SET_APERTURE(dev, sc->initial_aperture); 152 agp_free_gatt(sc->gatt); 153 154 return 0; 155 } 156 157 static u_int32_t 158 agp_via_get_aperture(device_t dev) 159 { 160 u_int32_t apsize; 161 162 apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f; 163 164 /* 165 * The size is determined by the number of low bits of 166 * register APBASE which are forced to zero. The low 20 bits 167 * are always forced to zero and each zero bit in the apsize 168 * field just read forces the corresponding bit in the 27:20 169 * to be zero. We calculate the aperture size accordingly. 170 */ 171 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1; 172 } 173 174 static int 175 agp_via_set_aperture(device_t dev, u_int32_t aperture) 176 { 177 u_int32_t apsize; 178 179 /* 180 * Reverse the magic from get_aperture. 181 */ 182 apsize = ((aperture - 1) >> 20) ^ 0xff; 183 184 /* 185 * Double check for sanity. 186 */ 187 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) 188 return EINVAL; 189 190 pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1); 191 192 return 0; 193 } 194 195 static int 196 agp_via_bind_page(device_t dev, int offset, vm_offset_t physical) 197 { 198 struct agp_via_softc *sc = device_get_softc(dev); 199 200 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 201 return EINVAL; 202 203 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 204 return 0; 205 } 206 207 static int 208 agp_via_unbind_page(device_t dev, int offset) 209 { 210 struct agp_via_softc *sc = device_get_softc(dev); 211 212 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 213 return EINVAL; 214 215 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 216 return 0; 217 } 218 219 static void 220 agp_via_flush_tlb(device_t dev) 221 { 222 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4); 223 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4); 224 } 225 226 static device_method_t agp_via_methods[] = { 227 /* Device interface */ 228 DEVMETHOD(device_probe, agp_via_probe), 229 DEVMETHOD(device_attach, agp_via_attach), 230 DEVMETHOD(device_detach, agp_via_detach), 231 DEVMETHOD(device_shutdown, bus_generic_shutdown), 232 DEVMETHOD(device_suspend, bus_generic_suspend), 233 DEVMETHOD(device_resume, bus_generic_resume), 234 235 /* AGP interface */ 236 DEVMETHOD(agp_get_aperture, agp_via_get_aperture), 237 DEVMETHOD(agp_set_aperture, agp_via_set_aperture), 238 DEVMETHOD(agp_bind_page, agp_via_bind_page), 239 DEVMETHOD(agp_unbind_page, agp_via_unbind_page), 240 DEVMETHOD(agp_flush_tlb, agp_via_flush_tlb), 241 DEVMETHOD(agp_enable, agp_generic_enable), 242 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory), 243 DEVMETHOD(agp_free_memory, agp_generic_free_memory), 244 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory), 245 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory), 246 247 { 0, 0 } 248 }; 249 250 static driver_t agp_via_driver = { 251 "agp", 252 agp_via_methods, 253 sizeof(struct agp_via_softc), 254 }; 255 256 static devclass_t agp_devclass; 257 258 DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0); 259