254 lines
6.8 KiB
C
254 lines
6.8 KiB
C
/* $NetBSD: obio.c,v 1.13 1994/11/21 21:31:13 gwr Exp $ */
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/*
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* Copyright (c) 1994 Gordon W. Ross
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* Copyright (c) 1993 Adam Glass
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Adam Glass and Gordon Ross.
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* 4. The name of the authors may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/device.h>
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#include <machine/autoconf.h>
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#include <machine/obio.h>
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#include <machine/pte.h>
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#include <machine/param.h>
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#include <machine/mon.h>
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#include <machine/isr.h>
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extern void obioattach __P((struct device *, struct device *, void *));
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struct obio_softc {
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struct device obio_dev;
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};
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struct cfdriver obiocd = {
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NULL, "obio", always_match, obioattach, DV_DULL,
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sizeof(struct obio_softc), 0 };
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void obio_print(addr, level)
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int addr, level;
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{
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printf(" addr 0x%x", addr);
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if (level >= 0)
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printf(" level %d", level);
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}
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void obioattach(parent, self, args)
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struct device *parent;
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struct device *self;
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void *args;
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{
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struct cfdata *new_match;
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printf("\n");
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while (1) {
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new_match = config_search(NULL, self, NULL);
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if (!new_match) break;
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config_attach(self, new_match, NULL, NULL);
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}
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}
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/*
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* Spacing of "interesting" OBIO mappings. We will
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* record only those with an OBIO address that is a
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* multiple of SAVE_INCR and below SAVE_LAST.
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* The saved mappings are just one page each, which
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* is good enough for all the devices that use this.
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*/
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#define SAVE_SHIFT 17
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#define SAVE_INCR (1<<SAVE_SHIFT)
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#define SAVE_MASK (SAVE_INCR-1)
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#define SAVE_SLOTS 16
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#define SAVE_LAST (SAVE_SLOTS * SAVE_INCR)
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/*
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* This is our record of "interesting" OBIO mappings that
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* the PROM has left in the virtual space reserved for it.
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* Each non-null array element holds the virtual address
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* of an OBIO mapping where the OBIO address mapped is:
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* (array_index * SAVE_INCR)
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* and the length of the mapping is one page.
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*/
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static caddr_t prom_mappings[SAVE_SLOTS];
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caddr_t obio_find_mapping(int pa, int size)
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{
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if ((size <= NBPG) &&
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(pa < SAVE_LAST) &&
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((pa & SAVE_MASK) == 0))
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{
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return prom_mappings[pa >> SAVE_SHIFT];
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}
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return (caddr_t)0;
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}
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/*
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* This defines the permission bits to put in our PTEs.
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* Device space is never cached, and the PROM appears to
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* leave off the "no-cache" bit, so we can do the same.
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*/
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#define PGBITS (PG_VALID|PG_WRITE|PG_SYSTEM)
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static void save_prom_mappings()
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{
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vm_offset_t pa;
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caddr_t segva, pgva;
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int pte, sme, i;
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segva = (caddr_t)MONSTART;
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while (segva < (caddr_t)MONEND) {
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sme = get_segmap(segva);
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if (sme == SEGINV) {
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segva += NBSG;
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continue; /* next segment */
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}
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/*
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* We have a valid segmap entry, so examine the
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* PTEs for all the pages in this segment.
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*/
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pgva = segva; /* starting page */
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segva += NBSG; /* ending page (next seg) */
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while (pgva < segva) {
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pte = get_pte(pgva);
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if ((pte & (PG_VALID | PG_TYPE)) ==
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(PG_VALID | PGT_OBIO))
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{
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/* Have a valid OBIO mapping. */
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pa = PG_PA(pte);
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/* Is it one we want to record? */
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if ((pa < SAVE_LAST) &&
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((pa & SAVE_MASK) == 0))
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{
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i = pa >> SAVE_SHIFT;
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if (prom_mappings[i] == NULL) {
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prom_mappings[i] = pgva;
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#ifdef DEBUG
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mon_printf("obio: found pa=0x%x\n", pa);
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#endif
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}
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}
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/* Make sure it has the right permissions. */
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if ((pte & PGBITS) != PGBITS) {
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#ifdef DEBUG
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mon_printf("obio: fixing pte=0x%x\n", pte);
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#endif
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pte |= PGBITS;
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set_pte(pgva, pte);
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}
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}
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pgva += NBPG; /* next page */
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}
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}
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}
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/*
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* These are all the OBIO address that are required early
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* in the life of the kernel. All are less one page long.
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*/
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static vm_offset_t required_mappings[] = {
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/* Basically the first six OBIO devices. */
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OBIO_KEYBD_MS,
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OBIO_ZS,
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OBIO_EEPROM,
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OBIO_CLOCK,
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OBIO_MEMERR,
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OBIO_INTERREG,
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(vm_offset_t)-1, /* end marker */
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};
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static void make_required_mappings()
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{
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vm_offset_t pa, *rmp;
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int idx;
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rmp = required_mappings;
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while (*rmp != (vm_offset_t)-1) {
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if (!obio_find_mapping(*rmp, NBPG)) {
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/*
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* XXX - Ack! Need to create one!
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* I don't think this can happen, but if
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* it does, we can allocate a PMEG in the
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* "high segment" and add it there. -gwr
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*/
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mon_printf("obio: no mapping for 0x%x\n", *rmp);
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mon_panic("obio: Ancient PROM?\n");
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}
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rmp++;
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}
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}
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/*
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* this routine "configures" any internal OBIO devices which must be
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* accessible before the mainline OBIO autoconfiguration as part of
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* configure().
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*/
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void obio_init()
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{
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save_prom_mappings();
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make_required_mappings();
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}
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caddr_t obio_alloc(obio_addr, obio_size)
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int obio_addr, obio_size;
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{
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int npages;
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vm_offset_t va, high_segment_alloc(), obio_pa, obio_va, pte_proto;
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caddr_t cp;
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cp = obio_find_mapping((vm_offset_t)obio_addr, obio_size);
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if (cp) return (cp);
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npages = PA_PGNUM(sun3_round_page(obio_size));
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if (!npages)
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panic("obio_alloc: attempt to allocate 0 pages for obio");
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va = high_segment_alloc(npages);
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if (!va)
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va = (vm_offset_t) obio_vm_alloc(npages);
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if (!va)
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panic("obio_alloc: unable to allocate va for obio mapping");
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/* Drivers always get writable, non-cached mappings. */
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pte_proto = PG_VALID | PG_WRITE | PG_SYSTEM | PGT_OBIO | PG_NC;
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obio_va = va;
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obio_pa = (vm_offset_t) obio_addr;
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for (; npages ; npages--, obio_va += NBPG, obio_pa += NBPG)
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set_pte(obio_va, pte_proto | PA_PGNUM(obio_pa));
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return (caddr_t) va;
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}
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int
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obio_probe_byte(oba)
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caddr_t oba; /* OBIO address to probe */
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{
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/* XXX - Not yet... */
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return 0;
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}
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