1 /* $OpentBSD: agp_intel.c,v 1.1 2001/10/25 21:44:00 thorpej Exp $ */ 2 /* $NetBSD: agp_intel.c,v 1.3 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_intel.c,v 1.4 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/agpio.h> 40 #include <sys/device.h> 41 #include <sys/agpio.h> 42 43 44 #include <dev/pci/pcivar.h> 45 #include <dev/pci/pcireg.h> 46 #include <dev/pci/vga_pcivar.h> 47 #include <dev/pci/agpvar.h> 48 #include <dev/pci/agpreg.h> 49 50 #include <machine/bus.h> 51 52 struct agp_intel_softc { 53 u_int32_t initial_aperture; /* aperture size at startup */ 54 struct agp_gatt *gatt; 55 }; 56 57 58 static u_int32_t agp_intel_get_aperture(struct vga_pci_softc *); 59 static int agp_intel_set_aperture(struct vga_pci_softc *, u_int32_t); 60 static int agp_intel_bind_page(struct vga_pci_softc *, off_t, bus_addr_t); 61 static int agp_intel_unbind_page(struct vga_pci_softc *, off_t); 62 static void agp_intel_flush_tlb(struct vga_pci_softc *); 63 64 struct agp_methods agp_intel_methods = { 65 agp_intel_get_aperture, 66 agp_intel_set_aperture, 67 agp_intel_bind_page, 68 agp_intel_unbind_page, 69 agp_intel_flush_tlb, 70 agp_generic_enable, 71 agp_generic_alloc_memory, 72 agp_generic_free_memory, 73 agp_generic_bind_memory, 74 agp_generic_unbind_memory, 75 }; 76 77 int 78 agp_intel_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa, 79 struct pci_attach_args *pchb_pa) 80 { 81 struct agp_intel_softc *isc; 82 struct agp_gatt *gatt; 83 pcireg_t reg; 84 85 isc = malloc(sizeof *isc, M_DEVBUF, M_NOWAIT); 86 if (isc == NULL) { 87 printf(": can't allocate chipset-specific softc\n"); 88 return (ENOMEM); 89 } 90 memset(isc, 0, sizeof *isc); 91 92 sc->sc_methods = &agp_intel_methods; 93 sc->sc_chipc = isc; 94 95 if (agp_map_aperture(sc) != 0) { 96 printf(": can't map aperture\n"); 97 free(isc, M_DEVBUF); 98 sc->sc_chipc = NULL; 99 return (ENXIO); 100 } 101 102 isc->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(": failed to set aperture\n"); 116 return (ENOMEM); 117 } 118 } 119 isc->gatt = gatt; 120 121 /* Install the gatt. */ 122 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_ATTBASE, 123 gatt->ag_physical); 124 125 /* Enable things, clear errors etc. */ 126 /* XXXfvdl get rid of the magic constants */ 127 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_AGPCTRL, 0x2280); 128 reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_NBXCFG); 129 reg &= ~(1 << 10); 130 reg |= (1 << 9); 131 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_NBXCFG, reg); 132 133 reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_STS); 134 reg &= ~0x00ff0000; 135 reg |= (7 << 16); 136 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_STS, reg); 137 138 return (0); 139 } 140 141 #if 0 142 static int 143 agp_intel_detach(struct vga_pci_softc *sc) 144 { 145 int error; 146 pcireg_t reg; 147 struct agp_intel_softc *isc = sc->sc_chipc; 148 149 error = agp_generic_detach(sc); 150 if (error) 151 return (error); 152 153 reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_NBXCFG); 154 reg &= ~(1 << 9); 155 printf("%s: set NBXCFG to %x\n", __FUNCTION__, reg); 156 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_NBXCFG, reg); 157 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_ATTBASE, 0); 158 AGP_SET_APERTURE(sc, isc->initial_aperture); 159 agp_free_gatt(sc, isc->gatt); 160 161 return (0); 162 } 163 #endif 164 165 static u_int32_t 166 agp_intel_get_aperture(struct vga_pci_softc *sc) 167 { 168 u_int32_t apsize; 169 170 apsize = pci_conf_read(sc->sc_pc, sc->sc_pcitag, 171 AGP_INTEL_APSIZE) & 0x1f; 172 173 /* 174 * The size is determined by the number of low bits of 175 * register APBASE which are forced to zero. The low 22 bits 176 * are always forced to zero and each zero bit in the apsize 177 * field just read forces the corresponding bit in the 27:22 178 * to be zero. We calculate the aperture size accordingly. 179 */ 180 return ((((apsize ^ 0x1f) << 22) | ((1 << 22) - 1)) + 1); 181 } 182 183 static int 184 agp_intel_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture) 185 { 186 u_int32_t apsize; 187 pcireg_t reg; 188 189 /* 190 * Reverse the magic from get_aperture. 191 */ 192 apsize = ((aperture - 1) >> 22) ^ 0x1f; 193 194 /* 195 * Double check for sanity. 196 */ 197 if ((((apsize ^ 0x1f) << 22) | ((1 << 22) - 1)) + 1 != aperture) 198 return (EINVAL); 199 200 reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_APSIZE); 201 reg = (reg & 0xffffff00) | apsize; 202 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_APSIZE, reg); 203 204 return (0); 205 } 206 207 static int 208 agp_intel_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical) 209 { 210 struct agp_intel_softc *isc = sc->sc_chipc; 211 212 if (offset < 0 || offset >= (isc->gatt->ag_entries << AGP_PAGE_SHIFT)) 213 return (EINVAL); 214 215 isc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical | 0x17; 216 return (0); 217 } 218 219 static int 220 agp_intel_unbind_page(struct vga_pci_softc *sc, off_t offset) 221 { 222 struct agp_intel_softc *isc = sc->sc_chipc; 223 224 if (offset < 0 || offset >= (isc->gatt->ag_entries << AGP_PAGE_SHIFT)) 225 return (EINVAL); 226 227 isc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 228 return (0); 229 } 230 231 static void 232 agp_intel_flush_tlb(struct vga_pci_softc *sc) 233 { 234 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_AGPCTRL, 0x2200); 235 pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_INTEL_AGPCTRL, 0x2280); 236 } 237