Annotation of sys/dev/pci/agp_ali.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: agp_ali.c,v 1.3 2007/08/04 19:40:25 reyk Exp $ */
! 2: /* $NetBSD: agp_ali.c,v 1.2 2001/09/15 00:25:00 thorpej Exp $ */
! 3:
! 4:
! 5: /*-
! 6: * Copyright (c) 2000 Doug Rabson
! 7: * All rights reserved.
! 8: *
! 9: * Redistribution and use in source and binary forms, with or without
! 10: * modification, are permitted provided that the following conditions
! 11: * are met:
! 12: * 1. Redistributions of source code must retain the above copyright
! 13: * notice, this list of conditions and the following disclaimer.
! 14: * 2. Redistributions in binary form must reproduce the above copyright
! 15: * notice, this list of conditions and the following disclaimer in the
! 16: * documentation and/or other materials provided with the distribution.
! 17: *
! 18: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 19: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 21: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 22: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 23: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 24: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 25: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 26: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 27: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 28: * SUCH DAMAGE.
! 29: *
! 30: * $FreeBSD: src/sys/pci/agp_ali.c,v 1.3 2001/07/05 21:28:46 jhb Exp $
! 31: */
! 32:
! 33:
! 34:
! 35: #include <sys/param.h>
! 36: #include <sys/kernel.h>
! 37: #include <sys/malloc.h>
! 38: #include <sys/systm.h>
! 39: #include <sys/proc.h>
! 40: #include <sys/conf.h>
! 41: #include <sys/device.h>
! 42: #include <sys/lock.h>
! 43: #include <sys/agpio.h>
! 44:
! 45: #include <dev/pci/pcivar.h>
! 46: #include <dev/pci/pcireg.h>
! 47: #include <dev/pci/vga_pcivar.h>
! 48: #include <dev/pci/agpvar.h>
! 49: #include <dev/pci/agpreg.h>
! 50:
! 51: #include <machine/bus.h>
! 52:
! 53: struct agp_ali_softc {
! 54: u_int32_t initial_aperture; /* aperture size at startup */
! 55: struct agp_gatt *gatt;
! 56: };
! 57:
! 58: u_int32_t agp_ali_get_aperture(struct vga_pci_softc *);
! 59: int agp_ali_set_aperture(struct vga_pci_softc *sc, u_int32_t);
! 60: int agp_ali_bind_page(struct vga_pci_softc *, off_t, bus_addr_t);
! 61: int agp_ali_unbind_page(struct vga_pci_softc *, off_t);
! 62: void agp_ali_flush_tlb(struct vga_pci_softc *);
! 63:
! 64: struct agp_methods agp_ali_methods = {
! 65: agp_ali_get_aperture,
! 66: agp_ali_set_aperture,
! 67: agp_ali_bind_page,
! 68: agp_ali_unbind_page,
! 69: agp_ali_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_ali_attach(struct vga_pci_softc *sc, struct pci_attach_args *pa,
! 79: struct pci_attach_args *pchb_pa)
! 80: {
! 81: struct agp_ali_softc *asc;
! 82: struct agp_gatt *gatt;
! 83: pcireg_t reg;
! 84:
! 85: asc = malloc(sizeof *asc, M_DEVBUF, M_NOWAIT);
! 86: if (asc == NULL) {
! 87: printf(": failed to allocate softc\n");
! 88: return (ENOMEM);
! 89: }
! 90: sc->sc_chipc = asc;
! 91: sc->sc_methods = &agp_ali_methods;
! 92:
! 93: if (agp_map_aperture(sc, AGP_APBASE, PCI_MAPREG_TYPE_MEM) != 0) {
! 94: printf(": failed to map aperture\n");
! 95: free(asc, M_DEVBUF);
! 96: return (ENXIO);
! 97: }
! 98:
! 99: asc->initial_aperture = agp_ali_get_aperture(sc);
! 100:
! 101: for (;;) {
! 102: gatt = agp_alloc_gatt(sc);
! 103: if (gatt != NULL)
! 104: break;
! 105:
! 106: /*
! 107: * Probably contigmalloc failure. Try reducing the
! 108: * aperture so that the gatt size reduces.
! 109: */
! 110: if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
! 111: agp_generic_detach(sc);
! 112: printf(": failed to set aperture\n");
! 113: return (ENOMEM);
! 114: }
! 115: }
! 116: asc->gatt = gatt;
! 117:
! 118: /* Install the gatt. */
! 119: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE);
! 120: reg = (reg & 0xff) | gatt->ag_physical;
! 121: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE, reg);
! 122:
! 123: /* Enable the TLB. */
! 124: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL);
! 125: reg = (reg & ~0xff) | 0x10;
! 126: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL, reg);
! 127:
! 128: return (0);
! 129: }
! 130:
! 131: #if 0
! 132: int
! 133: agp_ali_detach(struct vga_pci_softc *sc)
! 134: {
! 135: int error;
! 136: pcireg_t reg;
! 137: struct agp_ali_softc *asc = sc->sc_chipc;
! 138:
! 139: error = agp_generic_detach(sc);
! 140: if (error)
! 141: return (error);
! 142:
! 143: /* Disable the TLB.. */
! 144: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL);
! 145: reg &= ~0xff;
! 146: reg |= 0x90;
! 147: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL, reg);
! 148:
! 149: /* Put the aperture back the way it started. */
! 150: AGP_SET_APERTURE(sc, asc->initial_aperture);
! 151: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE);
! 152: reg &= 0xff;
! 153: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE, reg);
! 154:
! 155: agp_free_gatt(sc, asc->gatt);
! 156: return (0);
! 157: }
! 158: #endif
! 159:
! 160: #define M 1024*1024
! 161:
! 162: static const u_int32_t agp_ali_table[] = {
! 163: 0, /* 0 - invalid */
! 164: 1, /* 1 - invalid */
! 165: 2, /* 2 - invalid */
! 166: 4*M, /* 3 - invalid */
! 167: 8*M, /* 4 - invalid */
! 168: 0, /* 5 - invalid */
! 169: 16*M, /* 6 - invalid */
! 170: 32*M, /* 7 - invalid */
! 171: 64*M, /* 8 - invalid */
! 172: 128*M, /* 9 - invalid */
! 173: 256*M, /* 10 - invalid */
! 174: };
! 175: #define agp_ali_table_size (sizeof(agp_ali_table) / sizeof(agp_ali_table[0]))
! 176:
! 177: u_int32_t
! 178: agp_ali_get_aperture(struct vga_pci_softc *sc)
! 179: {
! 180: int i;
! 181:
! 182: /*
! 183: * The aperture size is derived from the low bits of attbase.
! 184: * I'm not sure this is correct..
! 185: */
! 186: i = (int)pci_conf_read(sc->sc_pc, sc->sc_pcitag,
! 187: AGP_ALI_ATTBASE) & 0xff;
! 188: if (i >= agp_ali_table_size)
! 189: return (0);
! 190: return (agp_ali_table[i]);
! 191: }
! 192:
! 193: int
! 194: agp_ali_set_aperture(struct vga_pci_softc *sc, u_int32_t aperture)
! 195: {
! 196: int i;
! 197: pcireg_t reg;
! 198:
! 199: for (i = 0; i < agp_ali_table_size; i++)
! 200: if (agp_ali_table[i] == aperture)
! 201: break;
! 202: if (i == agp_ali_table_size)
! 203: return EINVAL;
! 204:
! 205: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE);
! 206: reg &= ~0xff;
! 207: reg |= i;
! 208: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_ATTBASE, reg);
! 209: return (0);
! 210: }
! 211:
! 212: int
! 213: agp_ali_bind_page(struct vga_pci_softc *sc, off_t offset, bus_addr_t physical)
! 214: {
! 215: struct agp_ali_softc *asc = sc->sc_chipc;
! 216:
! 217: if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
! 218: return (EINVAL);
! 219:
! 220: asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
! 221: return (0);
! 222: }
! 223:
! 224: int
! 225: agp_ali_unbind_page(struct vga_pci_softc *sc, off_t offset)
! 226: {
! 227: struct agp_ali_softc *asc = sc->sc_chipc;
! 228:
! 229: if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
! 230: return (EINVAL);
! 231:
! 232: asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
! 233: return (0);
! 234: }
! 235:
! 236: void
! 237: agp_ali_flush_tlb(struct vga_pci_softc *sc)
! 238: {
! 239: pcireg_t reg;
! 240:
! 241: reg = pci_conf_read(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL);
! 242: reg &= ~0xff;
! 243: reg |= 0x90;
! 244: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL, reg);
! 245: reg &= ~0xff;
! 246: reg |= 0x10;
! 247: pci_conf_write(sc->sc_pc, sc->sc_pcitag, AGP_ALI_TLBCTRL, reg);
! 248: }
! 249:
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