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