agp_amd.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_amd.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#include <machine/clock.h> 48#include <machine/bus.h> 49#include <machine/resource.h> 50#include <sys/rman.h> 51 52#define READ2(off) bus_space_read_2(sc->bst, sc->bsh, off) 53#define READ4(off) bus_space_read_4(sc->bst, sc->bsh, off) 54#define WRITE2(off,v) bus_space_write_2(sc->bst, sc->bsh, off, v) 55#define WRITE4(off,v) bus_space_write_4(sc->bst, sc->bsh, off, v) 56 57struct agp_amd_softc { 58 struct agp_softc agp; 59 struct resource *regs; /* memory mapped control registers */ 60 bus_space_tag_t bst; /* bus_space tag */ 61 bus_space_handle_t bsh; /* bus_space handle */ 62 u_int32_t initial_aperture; /* aperture size at startup */ 63 struct agp_gatt *gatt; 64}; 65 66static const char* 67agp_amd_match(device_t dev) 68{ 69 if (pci_get_class(dev) != PCIC_BRIDGE 70 || pci_get_subclass(dev) != PCIS_BRIDGE_HOST) 71 return NULL; 72 73 if (agp_find_caps(dev) == 0) 74 return NULL; 75 76 switch (pci_get_devid(dev)) { 77 case 0x70061022: 78 return ("AMD 751 host to AGP bridge"); 79 }; 80 81 return NULL; 82} 83 84static int 85agp_amd_probe(device_t dev) 86{ 87 const char *desc; 88 89 desc = agp_amd_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 99static int 100agp_amd_attach(device_t dev) 101{ 102 struct agp_amd_softc *sc = device_get_softc(dev); 103 struct agp_gatt *gatt; 104 int error, rid; 105 106 error = agp_generic_attach(dev); 107 if (error) 108 return error; 109 110 rid = AGP_AMD751_REGISTERS; 111 sc->regs = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, 112 0, ~0, 1, RF_ACTIVE); 113 if (!sc->regs) { 114 agp_generic_detach(dev); 115 return ENOMEM; 116 } 117 118 sc->bst = rman_get_bustag(sc->regs); 119 sc->bsh = rman_get_bushandle(sc->regs); 120 121 sc->initial_aperture = AGP_GET_APERTURE(dev); 122 123 for (;;) { 124 gatt = agp_alloc_gatt(dev); 125 if (gatt) 126 break; 127 128 /* 129 * Probably contigmalloc failure. Try reducing the 130 * aperture so that the gatt size reduces. 131 */ 132 if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) 133 return ENOMEM; 134 } 135 sc->gatt = gatt; 136 137 /* Install the gatt. */ 138 WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical); 139 140 /* Enable synchronisation between host and agp. */ 141 pci_write_config(dev, AGP_AMD751_MODECTRL, 0x80, 1); 142 143 /* Enable the TLB and flush */ 144 WRITE2(AGP_AMD751_STATUS, 145 READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE); 146 AGP_FLUSH_TLB(dev); 147 148 return agp_generic_attach(dev); 149} 150 151static int 152agp_amd_detach(device_t dev) 153{ 154 struct agp_amd_softc *sc = device_get_softc(dev); 155 156 /* Disable the TLB.. */ 157 WRITE2(AGP_AMD751_STATUS, 158 READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE); 159 160 /* Disable host-agp sync */ 161 pci_write_config(dev, AGP_AMD751_MODECTRL, 0x00, 1); 162 163 /* Clear the GATT base */ 164 WRITE4(AGP_AMD751_ATTBASE, 0); 165 166 /* Put the aperture back the way it started. */ 167 AGP_SET_APERTURE(dev, sc->initial_aperture); 168 169 agp_free_gatt(sc->gatt); 170 return 0; 171} 172 173static u_int32_t 174agp_amd_get_aperture(device_t dev) 175{ 176 int vas; 177 178 /* 179 * The aperture size is equal to 32M<<vas. 180 */ 181 vas = (pci_read_config(dev, AGP_AMD751_APCTRL, 1) & 0x06) >> 1; 182 return (32*1024*1024) << vas; 183} 184 185static int 186agp_amd_set_aperture(device_t dev, u_int32_t aperture) 187{ 188 int vas; 189 190 /* 191 * Check for a power of two and make sure its within the 192 * programmable range. 193 */ 194 if (aperture & (aperture - 1) 195 || aperture < 32*1024*1024 196 || aperture > 2U*1024*1024*1024) 197 return EINVAL; 198 199 vas = ffs(aperture / 32*1024*1024) - 1; 200 201 pci_write_config(dev, AGP_AMD751_APCTRL, 202 ((pci_read_config(dev, AGP_AMD751_APCTRL, 1) & ~0x06) 203 | vas << 1), 1); 204 205 return 0; 206} 207 208static int 209agp_amd_bind_page(device_t dev, int offset, vm_offset_t physical) 210{ 211 struct agp_amd_softc *sc = device_get_softc(dev); 212 213 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 214 return EINVAL; 215 216 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1; 217 return 0; 218} 219 220static int 221agp_amd_unbind_page(device_t dev, int offset) 222{ 223 struct agp_amd_softc *sc = device_get_softc(dev); 224 225 if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT)) 226 return EINVAL; 227 228 sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 229 return 0; 230} 231 232static void 233agp_amd_flush_tlb(device_t dev) 234{ 235 struct agp_amd_softc *sc = device_get_softc(dev); 236 237 /* Set the cache invalidate bit and wait for the chipset to clear */ 238 WRITE4(AGP_AMD751_TLBCTRL, 1); 239 do { 240 DELAY(1); 241 } while (READ4(AGP_AMD751_TLBCTRL)); 242} 243 244static device_method_t agp_amd_methods[] = { 245 /* Device interface */ 246 DEVMETHOD(device_probe, agp_amd_probe), 247 DEVMETHOD(device_attach, agp_amd_attach), 248 DEVMETHOD(device_detach, agp_amd_detach), 249 DEVMETHOD(device_shutdown, bus_generic_shutdown), 250 DEVMETHOD(device_suspend, bus_generic_suspend), 251 DEVMETHOD(device_resume, bus_generic_resume), 252 253 /* AGP interface */ 254 DEVMETHOD(agp_get_aperture, agp_amd_get_aperture), 255 DEVMETHOD(agp_set_aperture, agp_amd_set_aperture), 256 DEVMETHOD(agp_bind_page, agp_amd_bind_page), 257 DEVMETHOD(agp_unbind_page, agp_amd_unbind_page), 258 DEVMETHOD(agp_flush_tlb, agp_amd_flush_tlb), 259 DEVMETHOD(agp_enable, agp_generic_enable), 260 DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory), 261 DEVMETHOD(agp_free_memory, agp_generic_free_memory), 262 DEVMETHOD(agp_bind_memory, agp_generic_bind_memory), 263 DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory), 264 265 { 0, 0 } 266}; 267 268static driver_t agp_amd_driver = { 269 "agp", 270 agp_amd_methods, 271 sizeof(struct agp_amd_softc), 272}; 273 274static devclass_t agp_devclass; 275 276DRIVER_MODULE(agp_amd, pci, agp_amd_driver, agp_devclass, 0, 0); 277