NetBSD/sys/arch/sun3/dev/obio.c

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/* $NetBSD: obio.c,v 1.16 1995/02/13 22:23:57 gwr Exp $ */
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/*
* Copyright (c) 1994 Gordon W. Ross
* Copyright (c) 1993 Adam Glass
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Adam Glass and Gordon Ross.
* 4. The name of the authors may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
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#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
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#include <machine/autoconf.h>
#include <machine/pte.h>
#include <machine/mon.h>
#include <machine/isr.h>
#include <machine/obio.h>
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static void obio_attach __P((struct device *, struct device *, void *));
static void obio_scan __P((struct device *, void *));
struct cfdriver obiocd = {
NULL, "obio", always_match, obio_attach, DV_DULL,
sizeof(struct device), 0 };
static void
obio_attach(parent, self, args)
struct device *parent;
struct device *self;
void *args;
{
printf("\n");
config_scan(obio_scan, self);
}
static void
obio_scan(parent, child)
struct device *parent;
void *child;
{
bus_scan(parent, child, BUS_OBIO);
}
/*
* Spacing of "interesting" OBIO mappings. We will
* record only those with an OBIO address that is a
* multiple of SAVE_INCR and below SAVE_LAST.
* The saved mappings are just one page each, which
* is good enough for all the devices that use this.
*/
#define SAVE_SHIFT 17
#define SAVE_INCR (1<<SAVE_SHIFT)
#define SAVE_MASK (SAVE_INCR-1)
#define SAVE_SLOTS 16
#define SAVE_LAST (SAVE_SLOTS * SAVE_INCR)
/*
* This is our record of "interesting" OBIO mappings that
* the PROM has left in the virtual space reserved for it.
* Each non-null array element holds the virtual address
* of an OBIO mapping where the OBIO address mapped is:
* (array_index * SAVE_INCR)
* and the length of the mapping is one page.
*/
static caddr_t prom_mappings[SAVE_SLOTS];
caddr_t obio_find_mapping(int pa, int size)
{
if ((size <= NBPG) &&
(pa < SAVE_LAST) &&
((pa & SAVE_MASK) == 0))
{
return prom_mappings[pa >> SAVE_SHIFT];
}
return (caddr_t)0;
}
/*
* This defines the permission bits to put in our PTEs.
* Device space is never cached, and the PROM appears to
* leave off the "no-cache" bit, so we can do the same.
*/
#define PGBITS (PG_VALID|PG_WRITE|PG_SYSTEM)
static void save_prom_mappings()
{
vm_offset_t pa;
caddr_t segva, pgva;
int pte, sme, i;
segva = (caddr_t)MONSTART;
while (segva < (caddr_t)MONEND) {
sme = get_segmap(segva);
if (sme == SEGINV) {
segva += NBSG;
continue; /* next segment */
}
/*
* We have a valid segmap entry, so examine the
* PTEs for all the pages in this segment.
*/
pgva = segva; /* starting page */
segva += NBSG; /* ending page (next seg) */
while (pgva < segva) {
pte = get_pte(pgva);
if ((pte & (PG_VALID | PG_TYPE)) ==
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(PG_VALID | PGT_OBIO))
{
/* Have a valid OBIO mapping. */
pa = PG_PA(pte);
/* Is it one we want to record? */
if ((pa < SAVE_LAST) &&
((pa & SAVE_MASK) == 0))
{
i = pa >> SAVE_SHIFT;
if (prom_mappings[i] == NULL) {
prom_mappings[i] = pgva;
#ifdef DEBUG
mon_printf("obio: found pa=0x%x\n", pa);
#endif
}
}
/* Make sure it has the right permissions. */
if ((pte & PGBITS) != PGBITS) {
#ifdef DEBUG
mon_printf("obio: fixing pte=0x%x\n", pte);
#endif
pte |= PGBITS;
set_pte(pgva, pte);
}
}
pgva += NBPG; /* next page */
}
}
}
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/*
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* These are all the OBIO address that are required early in
* the life of the kernel. All are less than one page long.
*/
static vm_offset_t required_mappings[] = {
/* Basically the first six OBIO devices. */
OBIO_KEYBD_MS,
OBIO_ZS,
OBIO_EEPROM,
OBIO_CLOCK,
OBIO_MEMERR,
OBIO_INTERREG,
(vm_offset_t)-1, /* end marker */
};
static void make_required_mappings()
{
vm_offset_t pa, *rmp;
int idx;
rmp = required_mappings;
while (*rmp != (vm_offset_t)-1) {
if (!obio_find_mapping(*rmp, NBPG)) {
/*
* XXX - Ack! Need to create one!
* I don't think this can happen, but if
* it does, we can allocate a PMEG in the
* "high segment" and add it there. -gwr
*/
mon_printf("obio: no mapping for 0x%x\n", *rmp);
mon_panic("obio: Ancient PROM?\n");
}
rmp++;
}
}
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/*
* this routine "configures" any internal OBIO devices which must be
* accessible before the mainline OBIO autoconfiguration as part of
* configure().
*/
void obio_init()
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{
save_prom_mappings();
make_required_mappings();
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}
caddr_t obio_alloc(obio_addr, obio_size)
int obio_addr, obio_size;
{
caddr_t cp;
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cp = obio_find_mapping((vm_offset_t)obio_addr, obio_size);
if (cp) return (cp);
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cp = bus_mapin(BUS_OBIO, obio_addr, obio_size);
return (cp);
}