agp_amd.c revision 1.9
1 /* $NetBSD: agp_amd.c,v 1.9 2003/01/31 00:07:39 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/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: agp_amd.c,v 1.9 2003/01/31 00:07:39 thorpej Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/malloc.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/proc.h> 40 #include <sys/conf.h> 41 #include <sys/device.h> 42 #include <sys/agpio.h> 43 44 #include <uvm/uvm_extern.h> 45 46 #include <dev/pci/pcivar.h> 47 #include <dev/pci/pcireg.h> 48 #include <dev/pci/agpvar.h> 49 #include <dev/pci/agpreg.h> 50 51 #include <dev/pci/pcidevs.h> 52 53 #define READ2(off) bus_space_read_2(asc->iot, asc->ioh, off) 54 #define READ4(off) bus_space_read_4(asc->iot, asc->ioh, off) 55 #define WRITE2(off,v) bus_space_write_2(asc->iot, asc->ioh, off, v) 56 #define WRITE4(off,v) bus_space_write_4(asc->iot, asc->ioh, off, v) 57 58 struct agp_amd_gatt { 59 bus_dmamap_t ag_dmamap; 60 bus_dma_segment_t ag_dmaseg; 61 int ag_nseg; 62 u_int32_t ag_entries; 63 u_int32_t *ag_vdir; /* virtual address of page dir */ 64 bus_addr_t ag_pdir; /* bus address of page dir */ 65 u_int32_t *ag_virtual; /* virtual address of gatt */ 66 bus_addr_t ag_physical; /* bus address of gatt */ 67 size_t ag_size; 68 }; 69 70 struct agp_amd_softc { 71 u_int32_t initial_aperture; /* aperture size at startup */ 72 struct agp_amd_gatt *gatt; 73 bus_space_handle_t ioh; 74 bus_space_tag_t iot; 75 }; 76 77 static u_int32_t agp_amd_get_aperture(struct agp_softc *); 78 static int agp_amd_set_aperture(struct agp_softc *, u_int32_t); 79 static int agp_amd_bind_page(struct agp_softc *, off_t, bus_addr_t); 80 static int agp_amd_unbind_page(struct agp_softc *, off_t); 81 static void agp_amd_flush_tlb(struct agp_softc *); 82 83 84 struct agp_methods agp_amd_methods = { 85 agp_amd_get_aperture, 86 agp_amd_set_aperture, 87 agp_amd_bind_page, 88 agp_amd_unbind_page, 89 agp_amd_flush_tlb, 90 agp_generic_enable, 91 agp_generic_alloc_memory, 92 agp_generic_free_memory, 93 agp_generic_bind_memory, 94 agp_generic_unbind_memory, 95 }; 96 97 98 static struct agp_amd_gatt * 99 agp_amd_alloc_gatt(struct agp_softc *sc) 100 { 101 u_int32_t apsize = AGP_GET_APERTURE(sc); 102 u_int32_t entries = apsize >> AGP_PAGE_SHIFT; 103 struct agp_amd_gatt *gatt; 104 int i, npages; 105 caddr_t vdir; 106 107 gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_NOWAIT); 108 if (!gatt) 109 return 0; 110 111 if (agp_alloc_dmamem(sc->as_dmat, 112 AGP_PAGE_SIZE + entries * sizeof(u_int32_t), 0, 113 &gatt->ag_dmamap, &vdir, &gatt->ag_pdir, 114 &gatt->ag_dmaseg, 1, &gatt->ag_nseg) != 0) { 115 printf("failed to allocate GATT\n"); 116 free(gatt, M_AGP); 117 return NULL; 118 } 119 120 gatt->ag_vdir = (u_int32_t *)vdir; 121 gatt->ag_entries = entries; 122 gatt->ag_virtual = (u_int32_t *)(vdir + AGP_PAGE_SIZE); 123 gatt->ag_physical = gatt->ag_pdir + AGP_PAGE_SIZE; 124 gatt->ag_size = AGP_PAGE_SIZE + entries * sizeof(u_int32_t); 125 126 memset(gatt->ag_vdir, 0, AGP_PAGE_SIZE); 127 memset(gatt->ag_virtual, 0, entries * sizeof(u_int32_t)); 128 129 /* 130 * Map the pages of the GATT into the page directory. 131 */ 132 npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1) 133 >> AGP_PAGE_SHIFT); 134 135 for (i = 0; i < npages; i++) 136 gatt->ag_vdir[i] = (gatt->ag_physical + i * AGP_PAGE_SIZE) | 1; 137 138 /* 139 * Make sure the chipset can see everything. 140 */ 141 agp_flush_cache(); 142 143 return gatt; 144 } 145 146 #if 0 147 static void 148 agp_amd_free_gatt(struct agp_softc *sc, struct agp_amd_gatt *gatt) 149 { 150 agp_free_dmamem(sc->as_dmat, gatt->ag_size, 151 gatt->ag_dmamap, (caddr_t)gatt->ag_virtual, &gatt->ag_dmaseg, 152 gatt->ag_nseg); 153 free(gatt, M_AGP); 154 } 155 #endif 156 157 int 158 agp_amd_match(const struct pci_attach_args *pa) 159 { 160 161 switch (PCI_PRODUCT(pa->pa_id)) { 162 case PCI_PRODUCT_AMD_SC751_SC: 163 case PCI_PRODUCT_AMD_SC762_NB: 164 return 1; 165 } 166 167 return 0; 168 } 169 170 int 171 agp_amd_attach(struct device *parent, struct device *self, void *aux) 172 { 173 struct agp_softc *sc = (void *)self; 174 struct agp_amd_softc *asc; 175 struct pci_attach_args *pa = aux; 176 struct agp_amd_gatt *gatt; 177 pcireg_t reg; 178 int error; 179 180 asc = malloc(sizeof *asc, M_AGP, M_NOWAIT|M_ZERO); 181 if (asc == NULL) { 182 aprint_error(": can't allocate softc\n"); 183 /* agp_generic_detach(sc) */ 184 return ENOMEM; 185 } 186 187 error = pci_mapreg_map(pa, AGP_AMD751_REGISTERS, PCI_MAPREG_TYPE_MEM, 0, 188 &asc->iot, &asc->ioh, NULL, NULL); 189 if (error != 0) { 190 aprint_error(": can't map AGP registers\n"); 191 agp_generic_detach(sc); 192 return error; 193 } 194 195 if (agp_map_aperture(pa, sc) != 0) { 196 aprint_error(": can't map aperture\n"); 197 agp_generic_detach(sc); 198 free(asc, M_AGP); 199 return ENXIO; 200 } 201 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff, 202 NULL); 203 sc->as_methods = &agp_amd_methods; 204 sc->as_chipc = asc; 205 asc->initial_aperture = AGP_GET_APERTURE(sc); 206 207 for (;;) { 208 gatt = agp_amd_alloc_gatt(sc); 209 if (gatt) 210 break; 211 212 /* 213 * Probably contigmalloc failure. Try reducing the 214 * aperture so that the gatt size reduces. 215 */ 216 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 217 aprint_error(": can't set aperture\n"); 218 return ENOMEM; 219 } 220 } 221 asc->gatt = gatt; 222 223 /* Install the gatt. */ 224 WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical); 225 226 /* Enable synchronisation between host and agp. */ 227 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL); 228 reg &= ~0x00ff00ff; 229 reg |= (AGP_AMD751_MODECTRL_SYNEN) | (AGP_AMD751_MODECTRL2_GPDCE << 16); 230 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL, reg); 231 /* Enable the TLB and flush */ 232 WRITE2(AGP_AMD751_STATUS, 233 READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE); 234 AGP_FLUSH_TLB(sc); 235 236 return 0; 237 } 238 239 #if 0 240 static int 241 agp_amd_detach(struct agp_softc *sc) 242 { 243 pcireg_t reg; 244 struct agp_amd_softc *asc = sc->as_chipc; 245 246 /* Disable the TLB.. */ 247 WRITE2(AGP_AMD751_STATUS, 248 READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE); 249 250 /* Disable host-agp sync */ 251 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL); 252 reg &= 0xffffff00; 253 pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL, reg); 254 255 /* Clear the GATT base */ 256 WRITE4(AGP_AMD751_ATTBASE, 0); 257 258 /* Put the aperture back the way it started. */ 259 AGP_SET_APERTURE(sc, asc->initial_aperture); 260 261 agp_amd_free_gatt(sc, asc->gatt); 262 263 /* XXXfvdl no pci_mapreg_unmap */ 264 265 return 0; 266 } 267 #endif 268 269 static u_int32_t 270 agp_amd_get_aperture(struct agp_softc *sc) 271 { 272 int vas; 273 274 vas = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL) & 0x06); 275 vas >>= 1; 276 /* 277 * The aperture size is equal to 32M<<vas. 278 */ 279 return (32*1024*1024) << vas; 280 } 281 282 static int 283 agp_amd_set_aperture(struct agp_softc *sc, u_int32_t aperture) 284 { 285 int vas; 286 pcireg_t reg; 287 288 /* 289 * Check for a power of two and make sure its within the 290 * programmable range. 291 */ 292 if (aperture & (aperture - 1) 293 || aperture < 32*1024*1024 294 || aperture > 2U*1024*1024*1024) 295 return EINVAL; 296 297 vas = ffs(aperture / 32*1024*1024) - 1; 298 299 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL); 300 reg = (reg & ~0x06) | (vas << 1); 301 pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL, reg); 302 303 return 0; 304 } 305 306 static int 307 agp_amd_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical) 308 { 309 struct agp_amd_softc *asc = sc->as_chipc; 310 311 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 312 return EINVAL; 313 314 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1; 315 return 0; 316 } 317 318 static int 319 agp_amd_unbind_page(struct agp_softc *sc, off_t offset) 320 { 321 struct agp_amd_softc *asc = sc->as_chipc; 322 323 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 324 return EINVAL; 325 326 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 327 return 0; 328 } 329 330 static void 331 agp_amd_flush_tlb(struct agp_softc *sc) 332 { 333 struct agp_amd_softc *asc = sc->as_chipc; 334 335 /* Set the cache invalidate bit and wait for the chipset to clear */ 336 WRITE4(AGP_AMD751_TLBCTRL, 1); 337 do { 338 DELAY(1); 339 } while (READ4(AGP_AMD751_TLBCTRL)); 340 } 341
Indexes created Tue Sep 23 14:10:03 GMT 2025