1 /* $NetBSD: agp_via.c,v 1.20 2011/02/15 08:56:11 jmcneill 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_via.c,v 1.3 2001/07/05 21:28:47 jhb Exp $ 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: agp_via.c,v 1.20 2011/02/15 08:56:11 jmcneill 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 #include <dev/pci/pcidevs.h> 48 49 #include <sys/bus.h> 50 51 static u_int32_t agp_via_get_aperture(struct agp_softc *); 52 static int agp_via_set_aperture(struct agp_softc *, u_int32_t); 53 static int agp_via_bind_page(struct agp_softc *, off_t, bus_addr_t); 54 static int agp_via_unbind_page(struct agp_softc *, off_t); 55 static void agp_via_flush_tlb(struct agp_softc *); 56 57 static struct agp_methods agp_via_methods = { 58 agp_via_get_aperture, 59 agp_via_set_aperture, 60 agp_via_bind_page, 61 agp_via_unbind_page, 62 agp_via_flush_tlb, 63 agp_generic_enable, 64 agp_generic_alloc_memory, 65 agp_generic_free_memory, 66 agp_generic_bind_memory, 67 agp_generic_unbind_memory, 68 }; 69 70 struct agp_via_softc { 71 u_int32_t initial_aperture; /* aperture size at startup */ 72 struct agp_gatt *gatt; 73 int *regs; 74 }; 75 76 #define REG_GARTCTRL 0 77 #define REG_APSIZE 1 78 #define REG_ATTBASE 2 79 80 static int via_v2_regs[] = 81 { AGP_VIA_GARTCTRL, AGP_VIA_APSIZE, AGP_VIA_ATTBASE }; 82 static int via_v3_regs[] = 83 { AGP3_VIA_GARTCTRL, AGP3_VIA_APSIZE, AGP3_VIA_ATTBASE }; 84 85 int 86 agp_via_attach(device_t parent, device_t self, void *aux) 87 { 88 struct pci_attach_args *pa = aux; 89 struct agp_softc *sc = device_private(self); 90 struct agp_via_softc *asc; 91 struct agp_gatt *gatt; 92 pcireg_t agpsel, capval; 93 94 asc = malloc(sizeof *asc, M_AGP, M_NOWAIT|M_ZERO); 95 if (asc == NULL) { 96 aprint_error(": can't allocate chipset-specific softc\n"); 97 return ENOMEM; 98 } 99 sc->as_chipc = asc; 100 sc->as_methods = &agp_via_methods; 101 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff, 102 &capval); 103 104 if (PCI_CAP_AGP_MAJOR(capval) >= 3) { 105 agpsel = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_VIA_AGPSEL); 106 if ((agpsel & (1 << 9)) == 0) { 107 asc->regs = via_v3_regs; 108 aprint_debug(" (v3)"); 109 } else { 110 asc->regs = via_v2_regs; 111 aprint_debug(" (v2 compat mode)"); 112 } 113 } else { 114 asc->regs = via_v2_regs; 115 aprint_debug(" (v2)"); 116 } 117 118 if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) { 119 aprint_error(": can't map aperture\n"); 120 free(asc, M_AGP); 121 return ENXIO; 122 } 123 124 asc->initial_aperture = AGP_GET_APERTURE(sc); 125 126 for (;;) { 127 gatt = agp_alloc_gatt(sc); 128 if (gatt) 129 break; 130 131 /* 132 * Probably contigmalloc failure. Try reducing the 133 * aperture so that the gatt size reduces. 134 */ 135 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 136 agp_generic_detach(sc); 137 aprint_error(": can't set aperture size\n"); 138 return ENOMEM; 139 } 140 } 141 asc->gatt = gatt; 142 143 if (asc->regs == via_v2_regs) { 144 /* Install the gatt. */ 145 pci_conf_write(pa->pa_pc, pa->pa_tag, asc->regs[REG_ATTBASE], 146 gatt->ag_physical | 3); 147 /* Enable the aperture. */ 148 pci_conf_write(pa->pa_pc, pa->pa_tag, asc->regs[REG_GARTCTRL], 149 0x0000000f); 150 } else { 151 pcireg_t gartctrl; 152 /* Install the gatt. */ 153 pci_conf_write(pa->pa_pc, pa->pa_tag, asc->regs[REG_ATTBASE], 154 gatt->ag_physical); 155 /* Enable the aperture. */ 156 gartctrl = pci_conf_read(pa->pa_pc, pa->pa_tag, 157 asc->regs[REG_ATTBASE]); 158 pci_conf_write(pa->pa_pc, pa->pa_tag, asc->regs[REG_GARTCTRL], 159 gartctrl | (3 << 7)); 160 } 161 162 return 0; 163 } 164 165 #if 0 166 static int 167 agp_via_detach(struct agp_softc *sc) 168 { 169 struct agp_via_softc *asc = sc->as_chipc; 170 int error; 171 172 error = agp_generic_detach(sc); 173 if (error) 174 return error; 175 176 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 0); 177 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_ATTBASE], 0); 178 AGP_SET_APERTURE(sc, asc->initial_aperture); 179 agp_free_gatt(sc, asc->gatt); 180 181 return 0; 182 } 183 #endif 184 185 static u_int32_t 186 agp_via_get_aperture(struct agp_softc *sc) 187 { 188 struct agp_via_softc *asc = sc->as_chipc; 189 u_int32_t apsize; 190 191 apsize = pci_conf_read(sc->as_pc, sc->as_tag, asc->regs[REG_APSIZE]) 192 & 0x1f; 193 194 /* 195 * The size is determined by the number of low bits of 196 * register APBASE which are forced to zero. The low 20 bits 197 * are always forced to zero and each zero bit in the apsize 198 * field just read forces the corresponding bit in the 27:20 199 * to be zero. We calculate the aperture size accordingly. 200 */ 201 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1; 202 } 203 204 static int 205 agp_via_set_aperture(struct agp_softc *sc, u_int32_t aperture) 206 { 207 struct agp_via_softc *asc = sc->as_chipc; 208 u_int32_t apsize; 209 pcireg_t reg; 210 211 /* 212 * Reverse the magic from get_aperture. 213 */ 214 apsize = ((aperture - 1) >> 20) ^ 0xff; 215 216 /* 217 * Double check for sanity. 218 */ 219 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) 220 return EINVAL; 221 222 reg = pci_conf_read(sc->as_pc, sc->as_tag, asc->regs[REG_APSIZE]); 223 reg &= ~0xff; 224 reg |= apsize; 225 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_APSIZE], reg); 226 227 return 0; 228 } 229 230 static int 231 agp_via_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical) 232 { 233 struct agp_via_softc *asc = sc->as_chipc; 234 235 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 236 return EINVAL; 237 238 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 239 return 0; 240 } 241 242 static int 243 agp_via_unbind_page(struct agp_softc *sc, off_t offset) 244 { 245 struct agp_via_softc *asc = sc->as_chipc; 246 247 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 248 return EINVAL; 249 250 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 251 return 0; 252 } 253 254 static void 255 agp_via_flush_tlb(struct agp_softc *sc) 256 { 257 struct agp_via_softc *asc = sc->as_chipc; 258 pcireg_t gartctrl; 259 260 if (asc->regs == via_v2_regs) { 261 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 262 0x8f); 263 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 264 0x0f); 265 } else { 266 gartctrl = pci_conf_read(sc->as_pc, sc->as_tag, 267 asc->regs[REG_GARTCTRL]); 268 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 269 gartctrl & ~(1 << 7)); 270 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 271 gartctrl); 272 } 273 } 274