1 /* $OpenBSD: agp_amd.c,v 1.2 2002/07/25 23:31:04 fgsch Exp $ */ 2 /* $NetBSD: agp_amd.c,v 1.6 2001/10/06 02:48:50 thorpej Exp $ */ 3 4 5 /*- 6 * Copyright (c) 2000 Doug Rabson 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD: src/sys/pci/agp_amd.c,v 1.6 2001/07/05 21:28:46 jhb Exp $ 31 */ 32 33 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 #include <sys/lock.h> 40 #include <sys/proc.h> 41 #include <sys/conf.h> 42 #include <sys/device.h> 43 #include <sys/agpio.h> 44 45 #include <dev/pci/pcivar.h> 46 #include <dev/pci/pcireg.h> 47 #include <dev/pci/vga_pcivar.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 vga_pci_softc *); 78 static int agp_amd_set_aperture(struct vga_pci_softc *, u_int32_t); 79 static int agp_amd_bind_page(struct vga_pci_softc *, off_t, bus_addr_t); 80 static int agp_amd_unbind_page(struct vga_pci_softc *, off_t); 81 static void agp_amd_flush_tlb(struct vga_pci_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 vga_pci_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_DEVBUF, M_NOWAIT); 108 if (!gatt) 109 return (0); 110 111 if (agp_alloc_dmamem(sc->sc_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_DEVBUF); 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 vga_pci_softc *sc, struct agp_amd_gatt *gatt) 149 { 150 agp_free_dmamem(sc->sc_dmat, gatt->ag_size, 151 gatt->ag_dmamap, (caddr_t)gatt->ag_virtual, &gatt->ag_dmaseg, 152 gatt->ag_nseg); 153 free(gatt, M_DEVBUF); 154 } 155 #endif 156 157 int 158 agp_amd_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa, struct pci_attach_args *pchb_pa) 159 { 160 struct agp_amd_softc *asc; 161 struct agp_amd_gatt *gatt; 162 pcireg_t reg; 163 int error; 164 165 asc = malloc(sizeof *asc, M_DEVBUF, M_NOWAIT); 166 if (asc == NULL) { 167 printf(": can't allocate softc\n"); 168 /* agp_generic_detach(sc) */ 169 return (ENOMEM); 170 } 171 memset(asc, 0, sizeof *asc); 172 173 error = pci_mapreg_map(pchb_pa, AGP_AMD751_REGISTERS, 174 PCI_MAPREG_TYPE_MEM,0, &asc->iot, &asc->ioh, NULL, NULL, 0); 175 if (error != 0) { 176 printf(": can't map AGP registers\n"); 177 agp_generic_detach(sc); 178 return (error); 179 } 180 181 if (agp_map_aperture(sc) != 0) { 182 printf(": can't map aperture\n"); 183 agp_generic_detach(sc); 184 free(asc, M_DEVBUF); 185 return (ENXIO); 186 } 187 sc->sc_methods = &agp_amd_methods; 188 sc->sc_chipc = asc; 189 asc->initial_aperture = AGP_GET_APERTURE(sc); 190 191 for (;;) { 192 gatt = agp_amd_alloc_gatt(sc); 193 if (gatt) 194 break; 195 196 /* 197 * Probably contigmalloc failure. Try reducing the 198 * aperture so that the gatt size reduces. 199 */ 200 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 201 printf(": can't set aperture\n"); 202 return (ENOMEM); 203 } 204 } 205 asc->gatt = gatt; 206 207 /* Install the gatt. */ 208 WRITE4(AGP_AMD751_ATTBASE, gatt->ag_physical); 209 210 /* Enable synchronisation between host and agp. */ 211 reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_MODECTRL); 212 reg &= ~0x00ff00ff; 213 reg |= (AGP_AMD751_MODECTRL_SYNEN) | (AGP_AMD751_MODECTRL2_GPDCE << 16); 214 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_MODECTRL, reg); 215 /* Enable the TLB and flush */ 216 WRITE2(AGP_AMD751_STATUS, 217 READ2(AGP_AMD751_STATUS) | AGP_AMD751_STATUS_GCE); 218 AGP_FLUSH_TLB(sc); 219 220 return (0); 221 } 222 223 #if 0 224 static int 225 agp_amd_detach(struct vga_pci_softc *sc) 226 { 227 pcireg_t reg; 228 struct agp_amd_softc *asc = sc->sc_chipc; 229 230 /* Disable the TLB.. */ 231 WRITE2(AGP_AMD751_STATUS, 232 READ2(AGP_AMD751_STATUS) & ~AGP_AMD751_STATUS_GCE); 233 234 /* Disable host-agp sync */ 235 reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_MODECTRL); 236 reg &= 0xffffff00; 237 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_MODECTRL, reg); 238 239 /* Clear the GATT base */ 240 WRITE4(AGP_AMD751_ATTBASE, 0); 241 242 /* Put the aperture back the way it started. */ 243 AGP_SET_APERTURE(sc, asc->initial_aperture); 244 245 agp_amd_free_gatt(sc, asc->gatt); 246 247 /* XXXfvdl no pci_mapreg_unmap */ 248 249 return (0); 250 } 251 #endif 252 253 static u_int32_t 254 agp_amd_get_aperture(struct vga_pci_softc *sc) 255 { 256 int vas; 257 258 vas = (pci_conf_read(sc->sc_pc, sc->sc_pcitag, 259 AGP_AMD751_APCTRL) & 0x06); 260 vas >>= 1; 261 /* 262 * The aperture size is equal to 32M<<vas. 263 */ 264 return ((32 * 1024 * 1024) << vas); 265 } 266 267 static int 268 agp_amd_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture) 269 { 270 int vas; 271 pcireg_t reg; 272 273 /* 274 * Check for a power of two and make sure its within the 275 * programmable range. 276 */ 277 if (aperture & (aperture - 1) 278 || aperture < 32*1024*1024 279 || aperture > 2U*1024*1024*1024) 280 return (EINVAL); 281 282 vas = ffs(aperture / 32*1024*1024) - 1; 283 284 reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_APCTRL); 285 reg = (reg & ~0x06) | (vas << 1); 286 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_AMD751_APCTRL, reg); 287 288 return (0); 289 } 290 291 static int 292 agp_amd_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical) 293 { 294 struct agp_amd_softc *asc = sc->sc_chipc; 295 296 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 297 return (EINVAL); 298 299 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 1; 300 return (0); 301 } 302 303 static int 304 agp_amd_unbind_page(struct vga_pci_softc *sc, off_t offset) 305 { 306 struct agp_amd_softc *asc = sc->sc_chipc; 307 308 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 309 return (EINVAL); 310 311 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 312 return (0); 313 } 314 315 static void 316 agp_amd_flush_tlb(struct vga_pci_softc *sc) 317 { 318 struct agp_amd_softc *asc = sc->sc_chipc; 319 320 /* Set the cache invalidate bit and wait for the chipset to clear */ 321 WRITE4(AGP_AMD751_TLBCTRL, 1); 322 do { 323 DELAY(1); 324 } while (READ4(AGP_AMD751_TLBCTRL)); 325 } 326