1 /* $NetBSD: agp_sis.c,v 1.16 2026/06/21 17:09:44 andvar 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_sis.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_sis.c,v 1.16 2026/06/21 17:09:44 andvar Exp $"); 33 34 #include <sys/param.h> 35 #include <sys/agpio.h> 36 #include <sys/bus.h> 37 #include <sys/conf.h> 38 #include <sys/device.h> 39 #include <sys/malloc.h> 40 #include <sys/kernel.h> 41 #include <sys/proc.h> 42 #include <sys/systm.h> 43 44 #include <dev/pci/agpreg.h> 45 #include <dev/pci/agpvar.h> 46 #include <dev/pci/pcireg.h> 47 #include <dev/pci/pcivar.h> 48 49 struct agp_sis_softc { 50 u_int32_t initial_aperture; /* aperture size at startup */ 51 struct agp_gatt *gatt; 52 }; 53 54 static u_int32_t agp_sis_get_aperture(struct agp_softc *); 55 static int agp_sis_set_aperture(struct agp_softc *, u_int32_t); 56 static int agp_sis_bind_page(struct agp_softc *, off_t, bus_addr_t); 57 static int agp_sis_unbind_page(struct agp_softc *, off_t); 58 static void agp_sis_flush_tlb(struct agp_softc *); 59 60 static struct agp_methods agp_sis_methods = { 61 agp_sis_get_aperture, 62 agp_sis_set_aperture, 63 agp_sis_bind_page, 64 agp_sis_unbind_page, 65 agp_sis_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 int 74 agp_sis_attach(device_t parent, device_t self, void *aux) 75 { 76 struct agp_softc *sc = device_private(self); 77 struct pci_attach_args *pa = aux; 78 struct agp_sis_softc *ssc; 79 struct agp_gatt *gatt; 80 pcireg_t reg; 81 82 ssc = malloc(sizeof *ssc, M_AGP, M_WAITOK); 83 sc->as_methods = &agp_sis_methods; 84 sc->as_chipc = ssc; 85 pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff, 86 NULL); 87 88 if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) { 89 aprint_error(": can't map aperture\n"); 90 free(ssc, M_AGP); 91 return ENXIO; 92 } 93 94 ssc->initial_aperture = AGP_GET_APERTURE(sc); 95 96 for (;;) { 97 gatt = agp_alloc_gatt(sc); 98 if (gatt) 99 break; 100 101 /* 102 * Probably contigmalloc failure. Try reducing the 103 * aperture so that the gatt size reduces. 104 */ 105 if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) { 106 agp_generic_detach(sc); 107 aprint_error(": failed to set aperture\n"); 108 return ENOMEM; 109 } 110 } 111 ssc->gatt = gatt; 112 113 /* Install the gatt. */ 114 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_ATTBASE, 115 gatt->ag_physical); 116 117 /* Enable the aperture and auto-tlb-inval */ 118 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL); 119 reg |= (0x05 << 24) | 3; 120 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg); 121 122 return 0; 123 } 124 125 #if 0 126 static int 127 agp_sis_detach(struct agp_softc *sc) 128 { 129 struct agp_sis_softc *ssc = sc->as_chipc; 130 pcireg_t reg; 131 int error; 132 133 error = agp_generic_detach(sc); 134 if (error) 135 return error; 136 137 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL); 138 reg &= ~3; 139 reg &= 0x00ffffff; 140 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg); 141 142 /* Put the aperture back the way it started. */ 143 AGP_SET_APERTURE(sc, ssc->initial_aperture); 144 145 agp_free_gatt(sc, ssc->gatt); 146 return 0; 147 } 148 #endif 149 150 static u_int32_t 151 agp_sis_get_aperture(struct agp_softc *sc) 152 { 153 int gws; 154 155 /* 156 * The aperture size is equal to 4M<<gws. 157 */ 158 gws = (pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL)&0x70) >> 4; 159 return (4*1024*1024) << gws; 160 } 161 162 static int 163 agp_sis_set_aperture(struct agp_softc *sc, u_int32_t aperture) 164 { 165 int gws; 166 pcireg_t reg; 167 168 /* 169 * Check for a power of two and make sure its within the 170 * programmable range. 171 */ 172 if (aperture & (aperture - 1) 173 || aperture < 4*1024*1024 174 || aperture > 256*1024*1024) 175 return EINVAL; 176 177 gws = ffs(aperture / 4*1024*1024) - 1; 178 179 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL); 180 reg &= ~0x00000070; 181 reg |= gws << 4; 182 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_WINCTRL, reg); 183 184 return 0; 185 } 186 187 static int 188 agp_sis_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical) 189 { 190 struct agp_sis_softc *ssc = sc->as_chipc; 191 192 if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT)) 193 return EINVAL; 194 195 ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical; 196 return 0; 197 } 198 199 static int 200 agp_sis_unbind_page(struct agp_softc *sc, off_t offset) 201 { 202 struct agp_sis_softc *ssc = sc->as_chipc; 203 204 if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT)) 205 return EINVAL; 206 207 ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0; 208 return 0; 209 } 210 211 static void 212 agp_sis_flush_tlb(struct agp_softc *sc) 213 { 214 pcireg_t reg; 215 216 reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH); 217 reg &= 0xffffff00; 218 reg |= 0x02; 219 pci_conf_write(sc->as_pc, sc->as_tag, AGP_SIS_TLBFLUSH, reg); 220 } 221
Indexes created Sun Oct 25 00:26:45 UTC 2026