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