1 /* $OpenBSD: agp_via.c,v 1.2 2002/07/25 23:31:04 fgsch Exp $ */ 2 /* $NetBSD: agp_via.c,v 1.2 2001/09/15 00:25:00 thorpej Exp $ */ 3 4 /*- 5 * Copyright (c) 2000 Doug Rabson 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/sys/pci/agp_via.c,v 1.3 2001/07/05 21:28:47 jhb Exp $ 30 */ 31 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/malloc.h> 36 #include <sys/kernel.h> 37 #include <sys/lock.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/vga_pcivar.h> 46 #include <dev/pci/agpvar.h> 47 #include <dev/pci/agpreg.h> 48 49 #include <machine/bus.h> 50 51 static u_int32_t agp_via_get_aperture(struct vga_pci_softc *); 52 static int agp_via_set_aperture(struct vga_pci_softc *, u_int32_t); 53 static int agp_via_bind_page(struct vga_pci_softc *, off_t, bus_addr_t); 54 static int agp_via_unbind_page(struct vga_pci_softc *, off_t); 55 static void agp_via_flush_tlb(struct vga_pci_softc *); 56 57 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 }; 74 75 76 int 77 agp_via_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa, 78 struct pci_attach_args *pchb_pa) 79 { 80 struct agp_via_softc *asc; 81 struct agp_gatt *gatt; 82 83 asc = malloc(sizeof *asc, M_DEVBUF, M_NOWAIT); 84 if (asc == NULL) { 85 printf(": can't allocate chipset-specific softc\n"); 86 return (ENOMEM); 87 } 88 memset(asc, 0, sizeof *asc); 89 sc->sc_chipc = asc; 90 sc->sc_methods = &agp_via_methods; 91 92 if (agp_map_aperture(sc) != 0) { 93 printf(": can't map aperture\n"); 94 free(asc, M_DEVBUF); 95 return (ENXIO); 96 } 97 98 asc->initial_aperture = AGP_GET_APERTURE(sc); 99 100 for (;;) { 101 gatt = agp_alloc_gatt(sc); 102 if (gatt) 103 break; 104 105 /* 106 * Probably contigmalloc failure. Try reducing the 107 * aperture so that the gatt size reduces. 108 */ 109 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 110 agp_generic_detach(sc); 111 printf(": can't set aperture size\n"); 112 return (ENOMEM); 113 } 114 } 115 asc->gatt = gatt; 116 117 /* Install the gatt. */ 118 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_ATTBASE, 119 gatt->ag_physical | 3); 120 121 /* Enable the aperture. */ 122 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x0000000f); 123 124 return (0); 125 } 126 127 #if 0 128 static int 129 agp_via_detach(struct vga_pci_softc *sc) 130 { 131 struct agp_via_softc *asc = sc->sc_chipc; 132 int error; 133 134 error = agp_generic_detach(sc); 135 if (error) 136 return (error); 137 138 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0); 139 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_ATTBASE, 0); 140 AGP_SET_APERTURE(sc, asc->initial_aperture); 141 agp_free_gatt(sc, asc->gatt); 142 143 return (0); 144 } 145 #endif 146 147 static u_int32_t 148 agp_via_get_aperture(struct vga_pci_softc *sc) 149 { 150 u_int32_t apsize; 151 152 apsize = pci_conf_read(sc->sc_pc, sc->sc_pcitag, 153 AGP_VIA_APSIZE) & 0x1f; 154 155 /* 156 * The size is determined by the number of low bits of 157 * register APBASE which are forced to zero. The low 20 bits 158 * are always forced to zero and each zero bit in the apsize 159 * field just read forces the corresponding bit in the 27:20 160 * to be zero. We calculate the aperture size accordingly. 161 */ 162 return ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1); 163 } 164 165 static int 166 agp_via_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture) 167 { 168 u_int32_t apsize; 169 pcireg_t reg; 170 171 /* 172 * Reverse the magic from get_aperture. 173 */ 174 apsize = ((aperture - 1) >> 20) ^ 0xff; 175 176 /* 177 * Double check for sanity. 178 */ 179 if ((((apsize ^ 0xff) << 20) | ((1 << 20) - 1)) + 1 != aperture) 180 return (EINVAL); 181 182 reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_VIA_APSIZE); 183 reg &= ~0xff; 184 reg |= apsize; 185 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_APSIZE, reg); 186 187 return (0); 188 } 189 190 static int 191 agp_via_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical) 192 { 193 struct agp_via_softc *asc = sc->sc_chipc; 194 195 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 196 return (EINVAL); 197 198 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 199 return (0); 200 } 201 202 static int 203 agp_via_unbind_page(struct vga_pci_softc *sc, off_t offset) 204 { 205 struct agp_via_softc *asc = sc->sc_chipc; 206 207 if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT)) 208 return (EINVAL); 209 210 asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 211 return (0); 212 } 213 214 static void 215 agp_via_flush_tlb(struct vga_pci_softc *sc) 216 { 217 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x8f); 218 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_VIA_GARTCTRL, 0x0f); 219 } 220