Annotation of sys/dev/pci/agp_sis.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: agp_sis.c,v 1.3 2007/08/04 19:40:25 reyk Exp $ */
! 2: /* $NetBSD: agp_sis.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_sis.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: struct agp_sis_softc {
! 52: u_int32_t initial_aperture; /* aperture size at startup */
! 53: struct agp_gatt *gatt;
! 54: };
! 55:
! 56: static u_int32_t agp_sis_get_aperture(struct vga_pci_softc *);
! 57: static int agp_sis_set_aperture(struct vga_pci_softc *, u_int32_t);
! 58: static int agp_sis_bind_page(struct vga_pci_softc *, off_t, bus_addr_t);
! 59: static int agp_sis_unbind_page(struct vga_pci_softc *, off_t);
! 60: static void agp_sis_flush_tlb(struct vga_pci_softc *);
! 61:
! 62: struct agp_methods agp_sis_methods = {
! 63: agp_sis_get_aperture,
! 64: agp_sis_set_aperture,
! 65: agp_sis_bind_page,
! 66: agp_sis_unbind_page,
! 67: agp_sis_flush_tlb,
! 68: agp_generic_enable,
! 69: agp_generic_alloc_memory,
! 70: agp_generic_free_memory,
! 71: agp_generic_bind_memory,
! 72: agp_generic_unbind_memory,
! 73: };
! 74:
! 75:
! 76: int
! 77: agp_sis_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa,
! 78: struct pci_attach_args *pchb_pa)
! 79: {
! 80: struct agp_sis_softc *ssc;
! 81: struct agp_gatt *gatt;
! 82: pcireg_t reg;
! 83:
! 84: ssc = malloc(sizeof *ssc, M_DEVBUF, M_NOWAIT);
! 85: if (ssc == NULL) {
! 86: printf(": can't allocate chipset-specific softc\n");
! 87: return (ENOMEM);
! 88: }
! 89: sc->sc_methods = &agp_sis_methods;
! 90: sc->sc_chipc = ssc;
! 91:
! 92: if (agp_map_aperture(sc, AGP_APBASE, PCI_MAPREG_TYPE_MEM) != 0) {
! 93: printf(": can't map aperture\n");
! 94: free(ssc, M_DEVBUF);
! 95: return (ENXIO);
! 96: }
! 97:
! 98: ssc->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(": failed to set aperture\n");
! 112: return (ENOMEM);
! 113: }
! 114: }
! 115: ssc->gatt = gatt;
! 116:
! 117: /* Install the gatt. */
! 118: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_ATTBASE,
! 119: gatt->ag_physical);
! 120:
! 121: /* Enable the aperture and auto-tlb-inval */
! 122: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL);
! 123: reg |= (0x05 << 24) | 3;
! 124: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL, reg);
! 125:
! 126: return (0);
! 127: }
! 128:
! 129: #if 0
! 130: static int
! 131: agp_sis_detach(struct vga_pci_softc *sc)
! 132: {
! 133: struct agp_sis_softc *ssc = sc->sc_chipc;
! 134: pcireg_t reg;
! 135: int error;
! 136:
! 137: error = agp_generic_detach(sc);
! 138: if (error)
! 139: return (error);
! 140:
! 141: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL);
! 142: reg &= ~3;
! 143: reg &= 0x00ffffff;
! 144: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL, reg);
! 145:
! 146: /* Put the aperture back the way it started. */
! 147: AGP_SET_APERTURE(sc, ssc->initial_aperture);
! 148:
! 149: agp_free_gatt(sc, ssc->gatt);
! 150: return (0);
! 151: }
! 152: #endif
! 153:
! 154: static u_int32_t
! 155: agp_sis_get_aperture(struct vga_pci_softc *sc)
! 156: {
! 157: int gws;
! 158:
! 159: /*
! 160: * The aperture size is equal to 4M<<gws.
! 161: */
! 162: gws = (pci_conf_read(sc->sc_pc, sc->sc_pcitag,
! 163: AGP_SIS_WINCTRL)&0x70) >> 4;
! 164: return ((4 * 1024 * 1024) << gws);
! 165: }
! 166:
! 167: static int
! 168: agp_sis_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture)
! 169: {
! 170: int gws;
! 171: pcireg_t reg;
! 172:
! 173: /*
! 174: * Check for a power of two and make sure its within the
! 175: * programmable range.
! 176: */
! 177: if (aperture & (aperture - 1)
! 178: || aperture < 4*1024*1024
! 179: || aperture > 256*1024*1024)
! 180: return (EINVAL);
! 181:
! 182: gws = ffs(aperture / 4*1024*1024) - 1;
! 183:
! 184: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL);
! 185: reg &= ~0x00000070;
! 186: reg |= gws << 4;
! 187: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_WINCTRL, reg);
! 188:
! 189: return (0);
! 190: }
! 191:
! 192: static int
! 193: agp_sis_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical)
! 194: {
! 195: struct agp_sis_softc *ssc = sc->sc_chipc;
! 196:
! 197: if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
! 198: return (EINVAL);
! 199:
! 200: ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
! 201: return (0);
! 202: }
! 203:
! 204: static int
! 205: agp_sis_unbind_page(struct vga_pci_softc *sc, off_t offset)
! 206: {
! 207: struct agp_sis_softc *ssc = sc->sc_chipc;
! 208:
! 209: if (offset < 0 || offset >= (ssc->gatt->ag_entries << AGP_PAGE_SHIFT))
! 210: return (EINVAL);
! 211:
! 212: ssc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
! 213: return (0);
! 214: }
! 215:
! 216: static void
! 217: agp_sis_flush_tlb(struct vga_pci_softc *sc)
! 218: {
! 219: pcireg_t reg;
! 220:
! 221: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_SIS_TLBFLUSH);
! 222: reg &= 0xffffff00;
! 223: reg |= 0x02;
! 224: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_SIS_TLBFLUSH, reg);
! 225: }
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