agp_via.c revision 61452
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: head/sys/dev/agp/agp_via.c 61452 2000-06-09 16:04:30Z dfr $ 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 48struct 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 54static const char* 55agp_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 }; 74 75 if (pci_get_vendor(dev) == 0x1106) 76 return ("VIA Generic host to PCI bridge"); 77 78 return NULL; 79} 80 81static int 82agp_via_probe(device_t dev) 83{ 84 const char *desc; 85 86 desc = agp_via_match(dev); 87 if (desc) { 88 device_verbose(dev); 89 device_set_desc(dev, desc); 90 return 0; 91 } 92 93 return ENXIO; 94} 95 96static int 97agp_via_attach(device_t dev) 98{ 99 struct agp_via_softc *sc = device_get_softc(dev); 100 struct agp_gatt *gatt; 101 int error; 102 103 error = agp_generic_attach(dev); 104 if (error) 105 return error; 106 107 sc->initial_aperture = AGP_GET_APERTURE(dev); 108 109 for (;;) { 110 gatt = agp_alloc_gatt(dev); 111 if (gatt) 112 break; 113 114 /* 115 * Probably contigmalloc failure. Try reducing the 116 * aperture so that the gatt size reduces. 117 */ 118 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) { 119 agp_generic_detach(dev); 120 return ENOMEM; 121 } 122 } 123 sc->gatt = gatt; 124 125 /* Install the gatt. */ 126 pci_write_config(dev, AGP_VIA_ATTBASE, gatt->ag_physical | 3, 4); 127 128 /* Enable the aperture. */ 129 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4); 130 131 return 0; 132} 133 134static int 135agp_via_detach(device_t dev) 136{ 137 struct agp_via_softc *sc = device_get_softc(dev); 138 int error; 139 140 error = agp_generic_detach(dev); 141 if (error) 142 return error; 143 144 pci_write_config(dev, AGP_VIA_GARTCTRL, 0, 4); 145 pci_write_config(dev, AGP_VIA_ATTBASE, 0, 4); 146 AGP_SET_APERTURE(dev, sc->initial_aperture); 147 agp_free_gatt(sc->gatt); 148 149 return 0; 150} 151 152static u_int32_t 153agp_via_get_aperture(device_t dev) 154{ 155 u_int32_t apsize; 156 157 apsize = pci_read_config(dev, AGP_VIA_APSIZE, 1) & 0x1f; 158 159 /* 160 * The size is determined by the number of low bits of 161 * register APBASE which are forced to zero. The low 20 bits 162 * are always forced to zero and each zero bit in the apsize 163 * field just read forces the corresponding bit in the 27:20 164 * to be zero. We calculate the aperture size accordingly. 165 */ 166 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1; 167} 168 169static int 170agp_via_set_aperture(device_t dev, u_int32_t aperture) 171{ 172 u_int32_t apsize; 173 174 /* 175 * Reverse the magic from get_aperture. 176 */ 177 apsize = ((aperture - 1) >> 20) ^ 0xff; 178 179 /* 180 * Double check for sanity. 181 */ 182 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) 183 return EINVAL; 184 185 pci_write_config(dev, AGP_VIA_APSIZE, apsize, 1); 186 187 return 0; 188} 189 190static int 191agp_via_bind_page(device_t dev, int offset, vm_offset_t physical) 192{ 193 struct agp_via_softc *sc = device_get_softc(dev); 194 195 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 196 return EINVAL; 197 198 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 199 return 0; 200} 201 202static int 203agp_via_unbind_page(device_t dev, int offset) 204{ 205 struct agp_via_softc *sc = device_get_softc(dev); 206 207 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 208 return EINVAL; 209 210 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 211 return 0; 212} 213 214static void 215agp_via_flush_tlb(device_t dev) 216{ 217 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x8f, 4); 218 pci_write_config(dev, AGP_VIA_GARTCTRL, 0x0f, 4); 219} 220 221static device_method_t agp_via_methods[] = { 222 /* Device interface */ 223 DEVMETHOD(device_probe, agp_via_probe), 224 DEVMETHOD(device_attach, agp_via_attach), 225 DEVMETHOD(device_detach, agp_via_detach), 226 DEVMETHOD(device_shutdown, bus_generic_shutdown), 227 DEVMETHOD(device_suspend, bus_generic_suspend), 228 DEVMETHOD(device_resume, bus_generic_resume), 229 230 /* AGP interface */ 231 DEVMETHOD(agp_get_aperture, agp_via_get_aperture), 232 DEVMETHOD(agp_set_aperture, agp_via_set_aperture), 233 DEVMETHOD(agp_bind_page, agp_via_bind_page), 234 DEVMETHOD(agp_unbind_page, agp_via_unbind_page), 235 DEVMETHOD(agp_flush_tlb, agp_via_flush_tlb), 236 DEVMETHOD(agp_enable, agp_generic_enable), 237 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory), 238 DEVMETHOD(agp_free_memory, agp_generic_free_memory), 239 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory), 240 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory), 241 242 { 0, 0 } 243}; 244 245static driver_t agp_via_driver = { 246 "agp", 247 agp_via_methods, 248 sizeof(struct agp_via_softc), 249}; 250 251static devclass_t agp_devclass; 252 253DRIVER_MODULE(agp_via, pci, agp_via_driver, agp_devclass, 0, 0); 254