1 /* $NetBSD: agp_via.c,v 1.14 2007/10/19 12:00:39 ad 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 1.14 2007/10/19 12:00:39 ad 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 #include <dev/pci/pcidevs.h> 51 52 #include <sys/bus.h> 53 54 static u_int32_t agp_via_get_aperture(struct agp_softc *); 55 static int agp_via_set_aperture(struct agp_softc *, u_int32_t); 56 static int agp_via_bind_page(struct agp_softc *, off_t, bus_addr_t); 57 static int agp_via_unbind_page(struct agp_softc *, off_t); 58 static void agp_via_flush_tlb(struct agp_softc *); 59 60 static struct agp_methods agp_via_methods = { 61 agp_via_get_aperture, 62 agp_via_set_aperture, 63 agp_via_bind_page, 64 agp_via_unbind_page, 65 agp_via_flush_tlb, 66 agp_generic_enable, 67 agp_generic_alloc_memory, 68 agp_generic_free_memory, 69 agp_generic_bind_memory, 70 agp_generic_unbind_memory, 71 }; 72 73 struct agp_via_softc { 74 u_int32_t initial_aperture; /* aperture size at startup */ 75 struct agp_gatt *gatt; 76 int *regs; 77 }; 78 79 #define REG_GARTCTRL 0 80 #define REG_APSIZE 1 81 #define REG_ATTBASE 2 82 83 static int via_v2_regs[] = 84 { AGP_VIA_GARTCTRL, AGP_VIA_APSIZE, AGP_VIA_ATTBASE }; 85 static int via_v3_regs[] = 86 { AGP3_VIA_GARTCTRL, AGP3_VIA_APSIZE, AGP3_VIA_ATTBASE }; 87 88 int 89 agp_via_attach(struct device *parent, struct device *self, void *aux) 90 { 91 struct pci_attach_args *pa = aux; 92 struct agp_softc *sc = (void *)self; 93 struct agp_via_softc *asc; 94 struct agp_gatt *gatt; 95 pcireg_t agpsel, capval; 96 97 asc = malloc(sizeof *asc, M_AGP, M_NOWAIT|M_ZERO); 98 if (asc == NULL) { 99 aprint_error(": can't allocate chipset-specific softc\n"); 100 return ENOMEM; 101 } 102 sc->as_chipc = asc; 103 sc->as_methods = &agp_via_methods; 104 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff, 105 &capval); 106 107 if (PCI_CAP_AGP_MAJOR(capval) >= 3) { 108 agpsel = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_VIA_AGPSEL); 109 if ((agpsel & (1 << 1)) == 0) { 110 asc->regs = via_v3_regs; 111 printf(" (v3)"); 112 } else { 113 asc->regs = via_v2_regs; 114 printf(" (v2 compat mode)"); 115 } 116 } else { 117 asc->regs = via_v2_regs; 118 printf(" (v2)"); 119 } 120 121 if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) { 122 aprint_error(": can't map aperture\n"); 123 free(asc, M_AGP); 124 return ENXIO; 125 } 126 127 asc->initial_aperture = AGP_GET_APERTURE(sc); 128 129 for (;;) { 130 gatt = agp_alloc_gatt(sc); 131 if (gatt) 132 break; 133 134 /* 135 * Probably contigmalloc failure. Try reducing the 136 * aperture so that the gatt size reduces. 137 */ 138 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 139 agp_generic_detach(sc); 140 aprint_error(": can't set aperture size\n"); 141 return ENOMEM; 142 } 143 } 144 asc->gatt = gatt; 145 146 if (asc->regs == via_v2_regs) { 147 /* Install the gatt. */ 148 pci_conf_write(pa->pa_pc, pa->pa_tag, asc->regs[REG_ATTBASE], 149 gatt->ag_physical | 3); 150 /* Enable the aperture. */ 151 pci_conf_write(pa->pa_pc, pa->pa_tag, asc->regs[REG_GARTCTRL], 152 0x0000000f); 153 } else { 154 pcireg_t gartctrl; 155 /* Install the gatt. */ 156 pci_conf_write(pa->pa_pc, pa->pa_tag, asc->regs[REG_ATTBASE], 157 gatt->ag_physical); 158 /* Enable the aperture. */ 159 gartctrl = pci_conf_read(pa->pa_pc, pa->pa_tag, 160 asc->regs[REG_ATTBASE]); 161 pci_conf_write(pa->pa_pc, pa->pa_tag, asc->regs[REG_GARTCTRL], 162 gartctrl | (3 << 7)); 163 } 164 165 return 0; 166 } 167 168 #if 0 169 static int 170 agp_via_detach(struct agp_softc *sc) 171 { 172 struct agp_via_softc *asc = sc->as_chipc; 173 int error; 174 175 error = agp_generic_detach(sc); 176 if (error) 177 return error; 178 179 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 0); 180 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_ATTBASE], 0); 181 AGP_SET_APERTURE(sc, asc->initial_aperture); 182 agp_free_gatt(sc, asc->gatt); 183 184 return 0; 185 } 186 #endif 187 188 static u_int32_t 189 agp_via_get_aperture(struct agp_softc *sc) 190 { 191 struct agp_via_softc *asc = sc->as_chipc; 192 u_int32_t apsize; 193 194 apsize = pci_conf_read(sc->as_pc, sc->as_tag, asc->regs[REG_APSIZE]) 195 & 0x1f; 196 197 /* 198 * The size is determined by the number of low bits of 199 * register APBASE which are forced to zero. The low 20 bits 200 * are always forced to zero and each zero bit in the apsize 201 * field just read forces the corresponding bit in the 27:20 202 * to be zero. We calculate the aperture size accordingly. 203 */ 204 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1; 205 } 206 207 static int 208 agp_via_set_aperture(struct agp_softc *sc, u_int32_t aperture) 209 { 210 struct agp_via_softc *asc = sc->as_chipc; 211 u_int32_t apsize; 212 pcireg_t reg; 213 214 /* 215 * Reverse the magic from get_aperture. 216 */ 217 apsize = ((aperture - 1) >> 20) ^ 0xff; 218 219 /* 220 * Double check for sanity. 221 */ 222 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) 223 return EINVAL; 224 225 reg = pci_conf_read(sc->as_pc, sc->as_tag, asc->regs[REG_APSIZE]); 226 reg &= ~0xff; 227 reg |= apsize; 228 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_APSIZE], reg); 229 230 return 0; 231 } 232 233 static int 234 agp_via_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical) 235 { 236 struct agp_via_softc *asc = sc->as_chipc; 237 238 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 239 return EINVAL; 240 241 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 242 return 0; 243 } 244 245 static int 246 agp_via_unbind_page(struct agp_softc *sc, off_t offset) 247 { 248 struct agp_via_softc *asc = sc->as_chipc; 249 250 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 251 return EINVAL; 252 253 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 254 return 0; 255 } 256 257 static void 258 agp_via_flush_tlb(struct agp_softc *sc) 259 { 260 struct agp_via_softc *asc = sc->as_chipc; 261 pcireg_t gartctrl; 262 263 if (asc->regs == via_v2_regs) { 264 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 265 0x8f); 266 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 267 0x0f); 268 } else { 269 gartctrl = pci_conf_read(sc->as_pc, sc->as_tag, 270 asc->regs[REG_GARTCTRL]); 271 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 272 gartctrl & ~(1 << 7)); 273 pci_conf_write(sc->as_pc, sc->as_tag, asc->regs[REG_GARTCTRL], 274 gartctrl); 275 } 276 } 277