1 /* $NetBSD: agp_via.c,v 1.3 2001/11/13 07:48:40 lukem 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 1.3 2001/11/13 07:48:40 lukem 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 <machine/bus.h> 52 53 static u_int32_t agp_via_get_aperture(struct agp_softc *); 54 static int agp_via_set_aperture(struct agp_softc *, u_int32_t); 55 static int agp_via_bind_page(struct agp_softc *, off_t, bus_addr_t); 56 static int agp_via_unbind_page(struct agp_softc *, off_t); 57 static void agp_via_flush_tlb(struct agp_softc *); 58 59 struct agp_methods agp_via_methods = { 60 agp_via_get_aperture, 61 agp_via_set_aperture, 62 agp_via_bind_page, 63 agp_via_unbind_page, 64 agp_via_flush_tlb, 65 agp_generic_enable, 66 agp_generic_alloc_memory, 67 agp_generic_free_memory, 68 agp_generic_bind_memory, 69 agp_generic_unbind_memory, 70 }; 71 72 struct agp_via_softc { 73 u_int32_t initial_aperture; /* aperture size at startup */ 74 struct agp_gatt *gatt; 75 }; 76 77 int 78 agp_via_attach(struct device *parent, struct device *self, void *aux) 79 { 80 struct pci_attach_args *pa = aux; 81 struct agp_softc *sc = (void *)self; 82 struct agp_via_softc *asc; 83 struct agp_gatt *gatt; 84 85 asc = malloc(sizeof *asc, M_AGP, M_NOWAIT); 86 if (asc == NULL) { 87 printf(": can't allocate chipset-specific softc\n"); 88 return ENOMEM; 89 } 90 memset(asc, 0, sizeof *asc); 91 sc->as_chipc = asc; 92 sc->as_methods = &agp_via_methods; 93 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff, 94 NULL); 95 96 if (agp_map_aperture(pa, sc) != 0) { 97 printf(": can't map aperture\n"); 98 free(asc, M_AGP); 99 return ENXIO; 100 } 101 102 asc->initial_aperture = AGP_GET_APERTURE(sc); 103 104 for (;;) { 105 gatt = agp_alloc_gatt(sc); 106 if (gatt) 107 break; 108 109 /* 110 * Probably contigmalloc failure. Try reducing the 111 * aperture so that the gatt size reduces. 112 */ 113 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 114 agp_generic_detach(sc); 115 printf(": can't set aperture size\n"); 116 return ENOMEM; 117 } 118 } 119 asc->gatt = gatt; 120 121 /* Install the gatt. */ 122 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_VIA_ATTBASE, 123 gatt->ag_physical | 3); 124 125 /* Enable the aperture. */ 126 pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_VIA_GARTCTRL, 0x0000000f); 127 128 return 0; 129 } 130 131 #if 0 132 static int 133 agp_via_detach(struct agp_softc *sc) 134 { 135 struct agp_via_softc *asc = sc->as_chipc; 136 int error; 137 138 error = agp_generic_detach(sc); 139 if (error) 140 return error; 141 142 pci_conf_write(sc->as_pc, sc->as_tag, AGP_VIA_GARTCTRL, 0); 143 pci_conf_write(sc->as_pc, sc->as_tag, AGP_VIA_ATTBASE, 0); 144 AGP_SET_APERTURE(sc, asc->initial_aperture); 145 agp_free_gatt(sc, asc->gatt); 146 147 return 0; 148 } 149 #endif 150 151 static u_int32_t 152 agp_via_get_aperture(struct agp_softc *sc) 153 { 154 u_int32_t apsize; 155 156 apsize = pci_conf_read(sc->as_pc, sc->as_tag, AGP_VIA_APSIZE) & 0x1f; 157 158 /* 159 * The size is determined by the number of low bits of 160 * register APBASE which are forced to zero. The low 20 bits 161 * are always forced to zero and each zero bit in the apsize 162 * field just read forces the corresponding bit in the 27:20 163 * to be zero. We calculate the aperture size accordingly. 164 */ 165 return (((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1; 166 } 167 168 static int 169 agp_via_set_aperture(struct agp_softc *sc, u_int32_t aperture) 170 { 171 u_int32_t apsize; 172 pcireg_t reg; 173 174 /* 175 * Reverse the magic from get_aperture. 176 */ 177 apsize = ((aperture - 1) >> 20) ^ 0xff; 178 179 /* 180 * Double check for sanity. 181 */ 182 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) 183 return EINVAL; 184 185 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_VIA_APSIZE); 186 reg &= ~0xff; 187 reg |= apsize; 188 pci_conf_write(sc->as_pc, sc->as_tag, AGP_VIA_APSIZE, reg); 189 190 return 0; 191 } 192 193 static int 194 agp_via_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical) 195 { 196 struct agp_via_softc *asc = sc->as_chipc; 197 198 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 199 return EINVAL; 200 201 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 202 return 0; 203 } 204 205 static int 206 agp_via_unbind_page(struct agp_softc *sc, off_t offset) 207 { 208 struct agp_via_softc *asc = sc->as_chipc; 209 210 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 211 return EINVAL; 212 213 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 214 return 0; 215 } 216 217 static void 218 agp_via_flush_tlb(struct agp_softc *sc) 219 { 220 pci_conf_write(sc->as_pc, sc->as_tag, AGP_VIA_GARTCTRL, 0x8f); 221 pci_conf_write(sc->as_pc, sc->as_tag, AGP_VIA_GARTCTRL, 0x0f); 222 } 223