259 lines
6.4 KiB
C
259 lines
6.4 KiB
C
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/* $NetBSD: apecs.c,v 1.1 1995/06/28 01:25:18 cgd Exp $ */
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/*
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* Copyright (c) 1994, 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/device.h>
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#include <vm/vm.h>
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#include <machine/autoconf.h>
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#include <machine/pio.h>
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#include <machine/rpb.h>
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#include <dev/isa/isareg.h>
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#include <dev/isa/isavar.h>
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#include <alpha/isa/isa_dma.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcivar.h>
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#include <alpha/pci/pci_chipset.h>
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#include <alpha/pci/apecsreg.h>
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int apecsmatch __P((struct device *, void *, void *));
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void apecsattach __P((struct device *, struct device *, void *));
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struct cfdriver apecscd = {
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NULL, "apecs", apecsmatch, apecsattach, DV_DULL, sizeof(struct device)
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};
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static int apecsprint __P((void *, char *pnp));
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#ifdef DEC_2100_A50
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extern void pci_2100_a50_pickintr __P((void));
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#endif
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#define REGVAL(r) (*(int32_t *)phystok0seg(r))
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static int nsgmapent = 1024;
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static vm_offset_t sgmap_pci_base = 0x800000;
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/*static */struct sgmapent *sgmap;
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static char /* * */ sgbitmap[1024 / NBBY];
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int
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apecsmatch(parent, match, aux)
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struct device *parent;
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void *match, *aux;
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{
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struct cfdata *cf = match;
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struct confargs *pa = aux;
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/* XXX */
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return (1);
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}
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void
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apecsattach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct confargs *ca = aux;
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struct confargs nca;
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int pass2_comanche, widemem, pass2_epic;
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pass2_comanche = (REGVAL(COMANCHE_ED) & COMANCHE_ED_PASS2) != 0;
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widemem = (REGVAL(COMANCHE_GCR) & COMANCHE_GCR_WIDEMEM) != 0;
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pass2_epic = (REGVAL(EPIC_DCSR) & EPIC_DCSR_PASS2) != 0;
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sgmap = (struct sgmapent *)malloc(1024 * sizeof(struct sgmapent),
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M_DEVBUF, M_WAITOK);
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printf(": DECchip %s Core Logic chipset\n",
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widemem ? "21072" : "21071");
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printf("%s: DC21071-CA pass %d, %d-bit memory bus\n",
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self->dv_xname, pass2_comanche ? 2 : 1, widemem ? 128 : 64);
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printf("%s: DC21071-DA pass %d\n", self->dv_xname, pass2_epic ? 2 : 1);
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/* XXX print bcache size */
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if (!pass2_epic)
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printf("WARNING: 21071-DA NOT PASS2... NO BETS...\n");
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/* set up the chipset's functions */
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isadma_fcns = &apecs_isadma_fcns;
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isa_pio_fcns = &apecs_pio_fcns;
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if (!pass2_epic)
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pci_cs_fcns = &apecs_p1e_cs_fcns;
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else
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pci_cs_fcns = &apecs_p2e_cs_fcns;
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switch (hwrpb->rpb_type) {
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#if defined(DEC_2100_A50)
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case ST_DEC_2100_A50:
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pci_2100_a50_pickintr();
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break;
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#endif
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default:
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panic("apecsattach: shouldn't be here, really...");
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}
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/* attach the PCI bus that hangs off of it... */
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nca.ca_name = "pci";
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nca.ca_slot = 0;
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nca.ca_offset = 0;
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nca.ca_bus = NULL;
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if (!config_found(self, &nca, apecsprint))
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panic("apecsattach: couldn't attach PCI bus");
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}
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static int
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apecsprint(aux, pnp)
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void *aux;
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char *pnp;
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{
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register struct confargs *ca = aux;
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if (pnp)
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printf("%s at %s", ca->ca_name, pnp);
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return (UNCONF);
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}
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vm_offset_t /* XXX? */
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apecs_sgmap_alloc(va, npg, nocross, waitok)
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caddr_t va;
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int npg;
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vm_size_t nocross;
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int waitok;
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{
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int s;
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int base, i, stride;
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#ifdef DIAGNOSTIC
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/* Quick sanity checks. */
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if ((vm_offset_t)va & PGOFSET)
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panic("apecs_sgmap_alloc: va not page aligned");
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if ((nocross & (nocross - 1)) != 0 || nocross == 0)
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panic("apecs_sgmap_alloc: bogus alignment 0x%lx", nocross);
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if (npg <= 0)
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panic("apecs_sgmap_alloc: not allocating anything");
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if (npg > nsgmapent)
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panic("apecs_sgmap_alloc: insane allocation");
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if (ptoa(npg) > nocross)
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panic("apecs_sgmap_alloc: must cross boundary");
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#endif
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stride = atop(nocross);
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#ifdef DIAGNOSTIC
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if (stride > nsgmapent)
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panic("apecs_sgmap_alloc: cheesy implementation loses");
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#endif
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top:
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s = splhigh();
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for (base = 0; base < nsgmapent; base += stride) {
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for (i = base; i < base + npg; i++)
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if (isset(sgbitmap, i))
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goto nextstride;
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break;
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nextstride:
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}
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if (base < nsgmapent) /* found a free chunk, claim it */
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for (i = base; i < base + npg; i++)
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setbit(sgbitmap, i);
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splx(s);
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if (base >= nsgmapent) { /* didn't find a free chunk */
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if (!waitok)
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return 0;
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tsleep(&sgmap, PRIBIO+1, "sgmap", 0);
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goto top;
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}
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for (i = base; i < base + npg; i++) {
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#ifdef DIAGNOSTIC
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if ((sgmap[i].val & SGMAPENT_EVAL) != 0)
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panic("apecs_sgmap_alloc: unallocated entry valid");
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#endif
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sgmap[i].val = SGMAP_MAKEENTRY(atop(vtophys(va)));
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va += PAGE_SIZE;
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}
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/* Invalidate old cached entries. */
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REGVAL(EPIC_TBIA) = 1;
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/* Return the PCI address. */
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return (ptoa(base) + sgmap_pci_base);
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}
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void
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apecs_sgmap_dealloc(pa, npg)
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vm_offset_t pa;
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int npg;
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{
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int i, pfn;
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#ifdef DIAGNOSTIC
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/* Quick sanity checks. */
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if (pa & PGOFSET)
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panic("apecs_sgmap_dealloc: pa not page aligned");
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if (npg <= 0)
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panic("apecs_sgmap_dealloc: not deallocating anything");
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if (npg > nsgmapent)
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panic("apecs_sgmap_dealloc: insane deallocation");
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#endif
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pfn = atop(pa - sgmap_pci_base);
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#ifdef DIAGNOSTIC
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/* Bounds check the deallocation range. Paranoid about wraparound. */
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if (pfn < 0 || pfn >= nsgmapent || (pfn + npg) >= nsgmapent)
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panic("apecs_sgmap_dealloc: pa out of range (%s)",
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pfn < 0 ? "too low" : "too high");
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#endif
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for (i = 0; i < npg; i++) {
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#ifdef DIAGNOSTIC
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/* Make sure it's actually allocated. */
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if (isclr(sgbitmap, i + pfn))
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panic("apecs_sgmap_dealloc: multiple frees: entry %d",
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i + pfn);
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#endif
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/* Clear the entries and the allocation map bits. */
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clrbit(sgbitmap, i + pfn);
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sgmap[i + pfn].val &= ~SGMAPENT_EVAL;
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}
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/* Invalidate old cached entries. */
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REGVAL(EPIC_TBIA) = 1;
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/* Wake up anybody waiting for map entries. */
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wakeup(&sgmap);
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}
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