343 lines
9.2 KiB
C
343 lines
9.2 KiB
C
/* $NetBSD: obio.c,v 1.31 1997/10/04 19:46:20 gwr Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Adam Glass and Gordon W. Ross.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* 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/control.h>
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#include <machine/machdep.h>
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#include <machine/mon.h>
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#include <machine/obio.h>
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#include <machine/pte.h>
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static int obio_match __P((struct device *, struct cfdata *, void *));
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static void obio_attach __P((struct device *, struct device *, void *));
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static int obio_print __P((void *, const char *parentname));
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static int obio_submatch __P((struct device *, struct cfdata *, void *));
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struct cfattach obio_ca = {
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sizeof(struct device), obio_match, obio_attach
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};
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struct cfdriver obio_cd = {
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NULL, "obio", DV_DULL
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};
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static int
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obio_match(parent, cf, aux)
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struct device *parent;
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struct cfdata *cf;
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void *aux;
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{
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struct confargs *ca = aux;
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if (ca->ca_bustype != BUS_OBIO)
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return (0);
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return(1);
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}
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#define OBIO_INCR 0x020000
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#define OBIO_END 0x200000
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static void
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obio_attach(parent, self, aux)
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struct device *parent;
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struct device *self;
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void *aux;
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{
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struct confargs *ca = aux;
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int addr;
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printf("\n");
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/* Configure these in order of address. */
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for (addr = 0; addr < OBIO_END; addr += OBIO_INCR) {
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/* Our parent set ca->ca_bustype already. */
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ca->ca_paddr = addr;
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/* These are filled-in by obio_submatch. */
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ca->ca_intpri = -1;
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ca->ca_intvec = -1;
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(void) config_found_sm(self, ca, obio_print, obio_submatch);
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}
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}
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/*
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* Print out the confargs. The (parent) name is non-NULL
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* when there was no match found by config_found().
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*/
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static int
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obio_print(args, name)
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void *args;
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const char *name;
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{
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/* Be quiet about empty OBIO locations. */
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if (name)
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return(QUIET);
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/* Otherwise do the usual. */
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return(bus_print(args, name));
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}
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int
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obio_submatch(parent, cf, aux)
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struct device *parent;
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struct cfdata *cf;
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void *aux;
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{
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struct confargs *ca = aux;
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cfmatch_t submatch;
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/*
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* Note that a defaulted address locator can never match
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* the value of ca->ca_paddr set by the obio_attach loop.
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* Without this diagnostic, any device with a defaulted
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* address locator would always be silently unmatched.
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* Therefore, just disallow default addresses on OBIO.
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*/
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#ifdef DIAGNOSTIC
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if (cf->cf_paddr == -1)
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panic("obio_submatch: invalid address for: %s%d\n",
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cf->cf_driver->cd_name, cf->cf_unit);
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#endif
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/*
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* Note that obio_attach calls config_found_sm() with
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* this function as the "submatch" and ca->ca_paddr
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* set to each of the possible OBIO locations, so we
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* want to reject any unmatched address here.
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*/
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if (cf->cf_paddr != ca->ca_paddr)
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return 0;
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/*
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* Copy the locators into our confargs for the child.
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* Note: ca->ca_bustype was set by our parent driver
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* (mainbus) and ca->ca_paddr was set by obio_attach.
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*/
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ca->ca_intpri = cf->cf_intpri;
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ca->ca_intvec = -1;
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/* Now call the match function of the potential child. */
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submatch = cf->cf_attach->ca_match;
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if (submatch == NULL)
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panic("obio_submatch: no match function for: %s\n",
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cf->cf_driver->cd_name);
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return ((*submatch)(parent, cf, aux));
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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
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save_prom_mappings __P((void))
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{
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vm_offset_t pa, segva, pgva;
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int pte, sme, i;
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segva = (vm_offset_t)MONSTART;
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while (segva < (vm_offset_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] = (caddr_t)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 in
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* the life of the kernel. All are less than 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_ZS_KBD_MS,
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OBIO_ZS_TTY_AB,
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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
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make_required_mappings __P((void))
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{
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vm_offset_t *rmp;
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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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sunmon_abort();
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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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* Find mappings for devices that are needed before autoconfiguration.
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* We first look for and record any useful PROM mappings, then call
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* the "init" functions for drivers that we need to use before the
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* normal autoconfiguration calls configure(). Warning: this is
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* called before pmap_bootstrap, so no allocation allowed!
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*/
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void
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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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* Find the interrupt reg mapping and turn off the
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* interrupts, otherwise the PROM clock interrupt
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* would poll the zs and toggle some LEDs...
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*/
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intreg_init();
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/* Make the zs driver ready for console duty. */
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zs_init();
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}
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/*
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* This function is used by some OBIO drivers to conserve
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* kernel virtual space by sharing mappings made by the
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* PROM monitor. If we could not find any mapping made by
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* the PROM monitor, then make our own as usual.
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*/
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caddr_t
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obio_mapin(obio_addr, obio_size)
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int obio_addr, obio_size;
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{
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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)
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return (cp);
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cp = bus_mapin(BUS_OBIO, obio_addr, obio_size);
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return (cp);
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}
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