1 /* $NetBSD: agp_amd.c,v 1.22 2019/11/10 21:16:36 chs 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 1.22 2019/11/10 21:16:36 chs 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/proc.h> 39 #include <sys/conf.h> 40 #include <sys/device.h> 41 #include <sys/agpio.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 static 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 void *vdir; 103 104 gatt = malloc(sizeof(struct agp_amd_gatt), M_AGP, M_WAITOK); 105 106 if (agp_alloc_dmamem(sc->as_dmat, 107 AGP_PAGE_SIZE + entries * sizeof(u_int32_t), 0, 108 &gatt->ag_dmamap, &vdir, &gatt->ag_pdir, 109 &gatt->ag_dmaseg, 1, &gatt->ag_nseg) != 0) { 110 printf("failed to allocate GATT\n"); 111 free(gatt, M_AGP); 112 return NULL; 113 } 114 115 gatt->ag_vdir = (u_int32_t *)vdir; 116 gatt->ag_entries = entries; 117 gatt->ag_virtual = (u_int32_t *)((char *)vdir + AGP_PAGE_SIZE); 118 gatt->ag_physical = gatt->ag_pdir + AGP_PAGE_SIZE; 119 gatt->ag_size = AGP_PAGE_SIZE + entries * sizeof(u_int32_t); 120 121 memset(gatt->ag_vdir, 0, AGP_PAGE_SIZE); 122 memset(gatt->ag_virtual, 0, entries * sizeof(u_int32_t)); 123 124 /* 125 * Map the pages of the GATT into the page directory. 126 */ 127 npages = ((entries * sizeof(u_int32_t) + AGP_PAGE_SIZE - 1) 128 >> AGP_PAGE_SHIFT); 129 130 for (i = 0; i < npages; i++) 131 gatt->ag_vdir[i] = (gatt->ag_physical + i * AGP_PAGE_SIZE) | 1; 132 133 /* 134 * Make sure the chipset can see everything. 135 */ 136 agp_flush_cache(); 137 138 return gatt; 139 } 140 141 #if 0 142 static void 143 agp_amd_free_gatt(struct agp_softc *sc, struct agp_amd_gatt *gatt) 144 { 145 agp_free_dmamem(sc->as_dmat, gatt->ag_size, 146 gatt->ag_dmamap, (void *)gatt->ag_virtual, &gatt->ag_dmaseg, 147 gatt->ag_nseg); 148 free(gatt, M_AGP); 149 } 150 #endif 151 152 int 153 agp_amd_match(const struct pci_attach_args *pa) 154 { 155 156 switch (PCI_PRODUCT(pa->pa_id)) { 157 case PCI_PRODUCT_AMD_SC751_SC: 158 case PCI_PRODUCT_AMD_SC761_SC: 159 case PCI_PRODUCT_AMD_SC762_NB: 160 return 1; 161 } 162 163 return 0; 164 } 165 166 int 167 agp_amd_attach(device_t parent, device_t self, void *aux) 168 { 169 struct agp_softc *sc = device_private(self); 170 struct agp_amd_softc *asc; 171 struct pci_attach_args *pa = aux; 172 struct agp_amd_gatt *gatt; 173 pcireg_t reg; 174 int error; 175 176 asc = malloc(sizeof *asc, M_AGP, M_WAITOK|M_ZERO); 177 178 error = pci_mapreg_map(pa, AGP_AMD751_REGISTERS, PCI_MAPREG_TYPE_MEM, 0, 179 &asc->iot, &asc->ioh, NULL, NULL); 180 if (error != 0) { 181 aprint_error(": can't map AGP registers\n"); 182 agp_generic_detach(sc); 183 free(asc, M_AGP); 184 return error; 185 } 186 187 if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) { 188 aprint_error(": can't map aperture\n"); 189 agp_generic_detach(sc); 190 free(asc, M_AGP); 191 return ENXIO; 192 } 193 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff, 194 NULL); 195 sc->as_methods = &agp_amd_methods; 196 sc->as_chipc = asc; 197 asc->initial_aperture = AGP_GET_APERTURE(sc); 198 199 for (;;) { 200 gatt = agp_amd_alloc_gatt(sc); 201 if (gatt) 202 break; 203 204 /* 205 * Probably contigmalloc failure. Try reducing the 206 * aperture so that the gatt size reduces. 207 */ 208 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 209 aprint_error(": can't set aperture\n"); 210 return ENOMEM; 211 } 212 } 213 asc->gatt = gatt; 214 215 /* Install the gatt. */ 216 WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical); 217 218 /* Enable synchronisation between host and agp. */ 219 reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL); 220 reg &= ~0x00ff00ff; 221 reg |= (AGP_AMD751_MODECTRL_SYNEN) | (AGP_AMD751_MODECTRL2_GPDCE << 16); 222 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_AMD751_MODECTRL, reg); 223 /* Enable the TLB and flush */ 224 WRITE2(AGP_AMD751_STATUS, 225 READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE); 226 AGP_FLUSH_TLB(sc); 227 228 return 0; 229 } 230 231 #if 0 232 static int 233 agp_amd_detach(struct agp_softc *sc) 234 { 235 pcireg_t reg; 236 struct agp_amd_softc *asc = sc->as_chipc; 237 238 /* Disable the TLB.. */ 239 WRITE2(AGP_AMD751_STATUS, 240 READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE); 241 242 /* Disable host-agp sync */ 243 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL); 244 reg &= 0xffffff00; 245 pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_MODECTRL, reg); 246 247 /* Clear the GATT base */ 248 WRITE4(AGP_AMD751_ATTBASE, 0); 249 250 /* Put the aperture back the way it started. */ 251 AGP_SET_APERTURE(sc, asc->initial_aperture); 252 253 agp_amd_free_gatt(sc, asc->gatt); 254 255 /* XXXfvdl no pci_mapreg_unmap */ 256 257 return 0; 258 } 259 #endif 260 261 static u_int32_t 262 agp_amd_get_aperture(struct agp_softc *sc) 263 { 264 int vas; 265 266 vas = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL) & 0x06); 267 vas >>= 1; 268 /* 269 * The aperture size is equal to 32M<<vas. 270 */ 271 return (32*1024*1024) << vas; 272 } 273 274 static int 275 agp_amd_set_aperture(struct agp_softc *sc, u_int32_t aperture) 276 { 277 int vas; 278 pcireg_t reg; 279 280 /* 281 * Check for a power of two and make sure its within the 282 * programmable range. 283 */ 284 if (aperture & (aperture - 1) 285 || aperture < 32*1024*1024 286 || aperture > 2U*1024*1024*1024) 287 return EINVAL; 288 289 vas = ffs(aperture / 32*1024*1024) - 1; 290 291 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL); 292 reg = (reg & ~0x06) | (vas << 1); 293 pci_conf_write(sc->as_pc, sc->as_tag, AGP_AMD751_APCTRL, reg); 294 295 return 0; 296 } 297 298 static int 299 agp_amd_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical) 300 { 301 struct agp_amd_softc *asc = sc->as_chipc; 302 303 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 304 return EINVAL; 305 306 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1; 307 return 0; 308 } 309 310 static int 311 agp_amd_unbind_page(struct agp_softc *sc, off_t offset) 312 { 313 struct agp_amd_softc *asc = sc->as_chipc; 314 315 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 316 return EINVAL; 317 318 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 319 return 0; 320 } 321 322 static void 323 agp_amd_flush_tlb(struct agp_softc *sc) 324 { 325 struct agp_amd_softc *asc = sc->as_chipc; 326 327 /* Set the cache invalidate bit and wait for the chipset to clear */ 328 WRITE4(AGP_AMD751_TLBCTRL, 1); 329 do { 330 DELAY(1); 331 } while (READ4(AGP_AMD751_TLBCTRL)); 332 } 333
Indexes created Sat Sep 20 22:09:52 GMT 2025