Annotation of sys/dev/pci/agp_via.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: agp_via.c,v 1.3 2007/08/04 19:40:25 reyk 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, AGP_APBASE, PCI_MAPREG_TYPE_MEM) != 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: }
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