agp_amd.c revision 1.1.2.2
1 /* $NetBSD: agp_amd.c,v 1.1.2.2 2001/09/13 01:15:50 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 Doug Rabson 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: src/sys/pci/agp_amd.c,v 1.6 2001/07/05 21:28:46 jhb Exp $ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/malloc.h> 34 #include <sys/kernel.h> 35 #include <sys/lock.h> 36 #include <sys/proc.h> 37 #include <sys/conf.h> 38 #include <sys/device.h> 39 #include <sys/agpio.h> 40 41 #include <uvm/uvm_extern.h> 42 43 #include <dev/pci/pcivar.h> 44 #include <dev/pci/pcireg.h> 45 #include <dev/pci/agpvar.h> 46 #include <dev/pci/agpreg.h> 47 48 #include <dev/pci/pcidevs.h> 49 50 #define READ2(off) bus_space_read_2(asc->iot, asc->ioh, off) 51 #define READ4(off) bus_space_read_4(asc->iot, asc->ioh, off) 52 #define WRITE2(off,v) bus_space_write_2(asc->iot, asc->ioh, off, v) 53 #define WRITE4(off,v) bus_space_write_4(asc->iot, asc->ioh, off, v) 54 55 struct agp_amd_gatt { 56 bus_dmamap_t ag_dmamap; 57 bus_dma_segment_t ag_dmaseg; 58 int ag_nseg; 59 u_int32_t ag_entries; 60 u_int32_t *ag_vdir; /* virtual address of page dir */ 61 bus_addr_t ag_pdir; /* bus address of page dir */ 62 u_int32_t *ag_virtual; /* virtual address of gatt */ 63 bus_addr_t ag_physical; /* bus address of gatt */ 64 size_t ag_size; 65 }; 66 67 struct agp_amd_softc { 68 u_int32_t initial_aperture; /* aperture size at startup */ 69 struct agp_amd_gatt *gatt; 70 bus_space_handle_t ioh; 71 bus_space_tag_t iot; 72 }; 73 74 static u_int32_t agp_amd_get_aperture(struct agp_softc *); 75 static int agp_amd_set_aperture(struct agp_softc *, u_int32_t); 76 static int agp_amd_bind_page(struct agp_softc *, off_t, bus_addr_t); 77 static int agp_amd_unbind_page(struct agp_softc *, off_t); 78 static void agp_amd_flush_tlb(struct agp_softc *); 79 80 81 struct agp_methods agp_amd_methods = { 82 agp_amd_get_aperture, 83 agp_amd_set_aperture, 84 agp_amd_bind_page, 85 agp_amd_unbind_page, 86 agp_amd_flush_tlb, 87 agp_generic_enable, 88 agp_generic_alloc_memory, 89 agp_generic_free_memory, 90 agp_generic_bind_memory, 91 agp_generic_unbind_memory, 92 }; 93 94 95 static struct agp_amd_gatt * 96 agp_amd_alloc_gatt(struct agp_softc *sc) 97 { 98 u_int32_t apsize = AGP_GET_APERTURE(sc); 99 u_int32_t entries = apsize >> AGP_PAGE_SHIFT; 100 struct agp_amd_gatt *gatt; 101 int i, npages; 102 103 gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT); 104 if (!gatt) 105 return 0; 106 107 if (agp_alloc_dmamem(sc->as_dmat, 108 AGP_PAGE_SIZE + entries * sizeof(u_int32_t), 0, 109 &gatt->ag_dmamap, (caddr_t *)&gatt->ag_vdir, &gatt->ag_pdir, 110 &gatt->ag_dmaseg, 1, &gatt->ag_nseg) != 0) { 111 printf("failed to allocate GATT\n"); 112 return NULL; 113 } 114 115 gatt->ag_entries = entries; 116 gatt->ag_virtual = gatt->ag_vdir + AGP_PAGE_SIZE; 117 gatt->ag_physical = gatt->ag_pdir + AGP_PAGE_SIZE; 118 gatt->ag_size = AGP_PAGE_SIZE + entries * sizeof(u_int32_t); 119 120 memset(gatt->ag_vdir, 0, AGP_PAGE_SIZE); 121 memset(gatt->ag_virtual, 0, entries * sizeof(u_int32_t)); 122 123 /* 124 * Map the pages of the GATT into the page directory. 125 */ 126 npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1) 127 >> AGP_PAGE_SHIFT); 128 129 for (i = 0; i < npages; i++) 130 gatt->ag_vdir[i] = (gatt->ag_physical + i * AGP_PAGE_SIZE) | 1; 131 132 /* 133 * Make sure the chipset can see everything. 134 */ 135 agp_flush_cache(); 136 137 return gatt; 138 } 139 140 #if 0 141 static void 142 agp_amd_free_gatt(struct agp_softc *sc, struct agp_amd_gatt *gatt) 143 { 144 agp_free_dmamem(sc->as_dmat, gatt->ag_size, 145 gatt->ag_dmamap, (caddr_t)gatt->ag_virtual, &gatt->ag_dmaseg, 146 gatt->ag_nseg); 147 free(gatt, M_AGP); 148 } 149 #endif 150 151 int 152 agp_amd_match(struct device *parent, struct cfdata *match, void *aux) 153 { 154 struct pci_attach_args *pa = aux; 155 156 if (pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, NULL, NULL) 157 == 0) 158 return 0; 159 160 switch (PCI_PRODUCT(pa->pa_id)) { 161 case PCI_PRODUCT_AMD_SC751_SC: 162 return 1; 163 } 164 165 return 0; 166 } 167 168 int 169 agp_amd_attach(struct device *parent, struct device *self, void *aux) 170 { 171 struct agp_softc *sc = (void *)self; 172 struct agp_amd_softc *asc; 173 struct pci_attach_args *pa = aux; 174 struct agp_amd_gatt *gatt; 175 pcireg_t reg; 176 int error; 177 178 asc = malloc(sizeof *asc, M_AGP, M_NOWAIT); 179 if (asc == NULL) { 180 printf(": can't allocate softc\n"); 181 /* agp_generic_detach(sc) */ 182 return ENOMEM; 183 } 184 memset(asc, 0, sizeof *asc); 185 186 error = pci_mapreg_map(pa, AGP_AMD751_REGISTERS, PCI_MAPREG_TYPE_IO, 0, 187 &asc->iot, &asc->ioh, NULL, NULL); 188 if (error != 0) { 189 printf(": can't map i/o space\n"); 190 agp_generic_detach(sc); 191 return error; 192 } 193 194 if (agp_map_aperture(pa, sc) != 0) { 195 printf(": can't map aperture\n"); 196 agp_generic_detach(sc); 197 free(asc, M_AGP); 198 return ENXIO; 199 } 200 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff, 201 NULL); 202 sc->as_methods = &agp_amd_methods; 203 sc->as_chipc = asc; 204 asc->initial_aperture = AGP_GET_APERTURE(sc); 205 206 for (;;) { 207 gatt = agp_amd_alloc_gatt(sc); 208 if (gatt) 209 break; 210 211 /* 212 * Probably contigmalloc failure. Try reducing the 213 * aperture so that the gatt size reduces. 214 */ 215 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 216 printf(": can't set aperture\n"); 217 return ENOMEM; 218 } 219 } 220 asc->gatt = gatt; 221 222 /* Install the gatt. */ 223 WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical); 224 225 /* Enable synchronisation between host and agp. */ 226 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL); 227 reg &= ~0x00ff00ff; 228 reg |= (AGP_AMD751_MODECTRL_SYNEN) | (AGP_AMD751_MODECTRL2_GPDCE << 16); 229 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL, reg); 230 /* Enable the TLB and flush */ 231 WRITE2(AGP_AMD751_STATUS, 232 READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE); 233 AGP_FLUSH_TLB(sc); 234 235 return 0; 236 } 237 238 #if 0 239 static int 240 agp_amd_detach(struct agp_softc *sc) 241 { 242 pcireg_t reg; 243 struct agp_amd_softc *asc = sc->as_chipc; 244 245 /* Disable the TLB.. */ 246 WRITE2(AGP_AMD751_STATUS, 247 READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE); 248 249 /* Disable host-agp sync */ 250 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL); 251 reg &= 0xffffff00; 252 pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL, reg); 253 254 /* Clear the GATT base */ 255 WRITE4(AGP_AMD751_ATTBASE, 0); 256 257 /* Put the aperture back the way it started. */ 258 AGP_SET_APERTURE(sc, asc->initial_aperture); 259 260 agp_amd_free_gatt(sc, asc->gatt); 261 262 /* XXXfvdl no pci_mapreg_unmap */ 263 264 return 0; 265 } 266 #endif 267 268 static u_int32_t 269 agp_amd_get_aperture(struct agp_softc *sc) 270 { 271 int vas; 272 273 vas = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL) & 0x06); 274 vas >>= 1; 275 /* 276 * The aperture size is equal to 32M<<vas. 277 */ 278 return (32*1024*1024) << vas; 279 } 280 281 static int 282 agp_amd_set_aperture(struct agp_softc *sc, u_int32_t aperture) 283 { 284 int vas; 285 pcireg_t reg; 286 287 /* 288 * Check for a power of two and make sure its within the 289 * programmable range. 290 */ 291 if (aperture & (aperture - 1) 292 || aperture < 32*1024*1024 293 || aperture > 2U*1024*1024*1024) 294 return EINVAL; 295 296 vas = ffs(aperture / 32*1024*1024) - 1; 297 298 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL); 299 reg = (reg & ~0x06) | (vas << 1); 300 pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL, reg); 301 302 return 0; 303 } 304 305 static int 306 agp_amd_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical) 307 { 308 struct agp_amd_softc *asc = sc->as_chipc; 309 310 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 311 return EINVAL; 312 313 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1; 314 return 0; 315 } 316 317 static int 318 agp_amd_unbind_page(struct agp_softc *sc, off_t offset) 319 { 320 struct agp_amd_softc *asc = sc->as_chipc; 321 322 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 323 return EINVAL; 324 325 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 326 return 0; 327 } 328 329 static void 330 agp_amd_flush_tlb(struct agp_softc *sc) 331 { 332 struct agp_amd_softc *asc = sc->as_chipc; 333 334 /* Set the cache invalidate bit and wait for the chipset to clear */ 335 WRITE4(AGP_AMD751_TLBCTRL, 1); 336 do { 337 DELAY(1); 338 } while (READ4(AGP_AMD751_TLBCTRL)); 339 } 340
Indexes created Sat Oct 11 13:09:53 GMT 2025