agp_amd.c revision 1.6
1 /* $NetBSD: agp_amd.c,v 1.6 2001/10/06 02:48:50 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 caddr_t vdir; 103 104 gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT); 105 if (!gatt) 106 return 0; 107 108 if (agp_alloc_dmamem(sc->as_dmat, 109 AGP_PAGE_SIZE + entries * sizeof(u_int32_t), 0, 110 &gatt->ag_dmamap, &vdir, &gatt->ag_pdir, 111 &gatt->ag_dmaseg, 1, &gatt->ag_nseg) != 0) { 112 printf("failed to allocate GATT\n"); 113 free(gatt, M_AGP); 114 return NULL; 115 } 116 117 gatt->ag_vdir = (u_int32_t *)vdir; 118 gatt->ag_entries = entries; 119 gatt->ag_virtual = (u_int32_t *)(vdir + AGP_PAGE_SIZE); 120 gatt->ag_physical = gatt->ag_pdir + AGP_PAGE_SIZE; 121 gatt->ag_size = AGP_PAGE_SIZE + entries * sizeof(u_int32_t); 122 123 memset(gatt->ag_vdir, 0, AGP_PAGE_SIZE); 124 memset(gatt->ag_virtual, 0, entries * sizeof(u_int32_t)); 125 126 /* 127 * Map the pages of the GATT into the page directory. 128 */ 129 npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1) 130 >> AGP_PAGE_SHIFT); 131 132 for (i = 0; i < npages; i++) 133 gatt->ag_vdir[i] = (gatt->ag_physical + i * AGP_PAGE_SIZE) | 1; 134 135 /* 136 * Make sure the chipset can see everything. 137 */ 138 agp_flush_cache(); 139 140 return gatt; 141 } 142 143 #if 0 144 static void 145 agp_amd_free_gatt(struct agp_softc *sc, struct agp_amd_gatt *gatt) 146 { 147 agp_free_dmamem(sc->as_dmat, gatt->ag_size, 148 gatt->ag_dmamap, (caddr_t)gatt->ag_virtual, &gatt->ag_dmaseg, 149 gatt->ag_nseg); 150 free(gatt, M_AGP); 151 } 152 #endif 153 154 int 155 agp_amd_match(const struct pci_attach_args *pa) 156 { 157 158 switch (PCI_PRODUCT(pa->pa_id)) { 159 case PCI_PRODUCT_AMD_SC751_SC: 160 case PCI_PRODUCT_AMD_SC762_NB: 161 return 1; 162 } 163 164 return 0; 165 } 166 167 int 168 agp_amd_attach(struct device *parent, struct device *self, void *aux) 169 { 170 struct agp_softc *sc = (void *)self; 171 struct agp_amd_softc *asc; 172 struct pci_attach_args *pa = aux; 173 struct agp_amd_gatt *gatt; 174 pcireg_t reg; 175 int error; 176 177 asc = malloc(sizeof *asc, M_AGP, M_NOWAIT); 178 if (asc == NULL) { 179 printf(": can't allocate softc\n"); 180 /* agp_generic_detach(sc) */ 181 return ENOMEM; 182 } 183 memset(asc, 0, sizeof *asc); 184 185 error = pci_mapreg_map(pa, AGP_AMD751_REGISTERS, PCI_MAPREG_TYPE_MEM, 0, 186 &asc->iot, &asc->ioh, NULL, NULL); 187 if (error != 0) { 188 printf(": can't map AGP registers\n"); 189 agp_generic_detach(sc); 190 return error; 191 } 192 193 if (agp_map_aperture(pa, sc) != 0) { 194 printf(": can't map aperture\n"); 195 agp_generic_detach(sc); 196 free(asc, M_AGP); 197 return ENXIO; 198 } 199 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff, 200 NULL); 201 sc->as_methods = &agp_amd_methods; 202 sc->as_chipc = asc; 203 asc->initial_aperture = AGP_GET_APERTURE(sc); 204 205 for (;;) { 206 gatt = agp_amd_alloc_gatt(sc); 207 if (gatt) 208 break; 209 210 /* 211 * Probably contigmalloc failure. Try reducing the 212 * aperture so that the gatt size reduces. 213 */ 214 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 215 printf(": can't set aperture\n"); 216 return ENOMEM; 217 } 218 } 219 asc->gatt = gatt; 220 221 /* Install the gatt. */ 222 WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical); 223 224 /* Enable synchronisation between host and agp. */ 225 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL); 226 reg &= ~0x00ff00ff; 227 reg |= (AGP_AMD751_MODECTRL_SYNEN) | (AGP_AMD751_MODECTRL2_GPDCE << 16); 228 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL, reg); 229 /* Enable the TLB and flush */ 230 WRITE2(AGP_AMD751_STATUS, 231 READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE); 232 AGP_FLUSH_TLB(sc); 233 234 return 0; 235 } 236 237 #if 0 238 static int 239 agp_amd_detach(struct agp_softc *sc) 240 { 241 pcireg_t reg; 242 struct agp_amd_softc *asc = sc->as_chipc; 243 244 /* Disable the TLB.. */ 245 WRITE2(AGP_AMD751_STATUS, 246 READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE); 247 248 /* Disable host-agp sync */ 249 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL); 250 reg &= 0xffffff00; 251 pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL, reg); 252 253 /* Clear the GATT base */ 254 WRITE4(AGP_AMD751_ATTBASE, 0); 255 256 /* Put the aperture back the way it started. */ 257 AGP_SET_APERTURE(sc, asc->initial_aperture); 258 259 agp_amd_free_gatt(sc, asc->gatt); 260 261 /* XXXfvdl no pci_mapreg_unmap */ 262 263 return 0; 264 } 265 #endif 266 267 static u_int32_t 268 agp_amd_get_aperture(struct agp_softc *sc) 269 { 270 int vas; 271 272 vas = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL) & 0x06); 273 vas >>= 1; 274 /* 275 * The aperture size is equal to 32M<<vas. 276 */ 277 return (32*1024*1024) << vas; 278 } 279 280 static int 281 agp_amd_set_aperture(struct agp_softc *sc, u_int32_t aperture) 282 { 283 int vas; 284 pcireg_t reg; 285 286 /* 287 * Check for a power of two and make sure its within the 288 * programmable range. 289 */ 290 if (aperture & (aperture - 1) 291 || aperture < 32*1024*1024 292 || aperture > 2U*1024*1024*1024) 293 return EINVAL; 294 295 vas = ffs(aperture / 32*1024*1024) - 1; 296 297 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL); 298 reg = (reg & ~0x06) | (vas << 1); 299 pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL, reg); 300 301 return 0; 302 } 303 304 static int 305 agp_amd_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical) 306 { 307 struct agp_amd_softc *asc = sc->as_chipc; 308 309 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 310 return EINVAL; 311 312 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1; 313 return 0; 314 } 315 316 static int 317 agp_amd_unbind_page(struct agp_softc *sc, off_t offset) 318 { 319 struct agp_amd_softc *asc = sc->as_chipc; 320 321 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 322 return EINVAL; 323 324 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 325 return 0; 326 } 327 328 static void 329 agp_amd_flush_tlb(struct agp_softc *sc) 330 { 331 struct agp_amd_softc *asc = sc->as_chipc; 332 333 /* Set the cache invalidate bit and wait for the chipset to clear */ 334 WRITE4(AGP_AMD751_TLBCTRL, 1); 335 do { 336 DELAY(1); 337 } while (READ4(AGP_AMD751_TLBCTRL)); 338 } 339
Indexes created Wed Sep 24 05:09:52 GMT 2025