Annotation of sys/dev/pci/agp_intel.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: agp_intel.c,v 1.4 2007/08/04 19:40:25 reyk 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, AGP_APBASE, PCI_MAPREG_TYPE_MEM) != 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: }
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