371 lines
9.9 KiB
C
371 lines
9.9 KiB
C
/* $NetBSD: obio.c,v 1.7 1997/10/04 19:48:36 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/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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short *enable_reg;
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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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/*
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* We need some control over the order of attachment on OBIO,
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* and all OBIO device addresses are known and fixed foerver.
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* Therefore, this uses a list of addresses to attach.
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* XXX - Any other way to control search/attach order?
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*
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* Warning: This whole list is very carefully ordered!
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* In general, anything not already shown here should
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* be added at or near the end.
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*/
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static int obio_alist[] = {
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/* Misc. registers - needed by many things */
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OBIO_ENABLEREG,
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OBIO_BUSERRREG,
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OBIO_DIAGREG, /* leds.c */
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OBIO_IDPROM1, /* idprom.c (3/470) */
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OBIO_MEMREG, /* memerr.c */
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OBIO_INTERREG, /* intreg.c */
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/* Zilog UARTs */
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OBIO_ZS_KBD_MS,
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OBIO_ZS_TTY_AB,
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/* eeprom.c */
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OBIO_EEPROM,
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/* Note: This must come after OBIO_IDPROM1. */
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OBIO_IDPROM2, /* idprom.c (3/80) */
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/* Note: Must probe for the Intersil first! */
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OBIO_CLOCK1, /* clock.c (3/470) */
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OBIO_CLOCK2, /* clock.c (3/80) */
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/* This is used by the Ethernet and SCSI drivers. */
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OBIO_IOMMU,
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OBIO_INTEL_ETHER,
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OBIO_LANCE_ETHER,
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OBIO_EMULEX_SCSI, /* 3/80 only */
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/* ...todo... */
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OBIO_FDC,
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OBIO_PRINTER_PORT,
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};
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#define OBIO_ALIST_LEN (sizeof(obio_alist) / \
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sizeof(obio_alist[0]))
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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 i;
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printf("\n");
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/* Configure these in the order listed above. */
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for (i = 0; i < OBIO_ALIST_LEN; i++) {
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/* Our parent set ca->ca_bustype already. */
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ca->ca_paddr = obio_alist[i];
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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 = cf->cf_intvec;
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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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* 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 struct prom_map {
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vm_offset_t pa, va;
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} prom_mappings[] = {
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{ OBIO_ENABLEREG, 0 }, /* regs: Sys ENA, Bus ERR, etc. */
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{ OBIO_ZS_KBD_MS, 0 }, /* Keyboard and Mouse */
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{ OBIO_ZS_TTY_AB, 0 }, /* Serial Ports */
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{ OBIO_EEPROM, 0 }, /* EEPROM/IDPROM/clock */
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};
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#define PROM_MAP_CNT (sizeof(prom_mappings) / \
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sizeof(prom_mappings[0]))
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/*
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* Find a virtual address for a device at physical address 'pa'.
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* If one is found among the mappings already made by the PROM
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* at power-up time, use it. Otherwise return 0 as a sign that
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* a mapping will have to be created.
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*/
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caddr_t
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obio_find_mapping(int pa, int size)
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{
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int i, off;
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if (size >= NBPG)
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return (caddr_t)0;
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off = pa & PGOFSET;
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pa -= off;
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for (i = 0; i < PROM_MAP_CNT; i++) {
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if (pa == prom_mappings[i].pa) {
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return ((caddr_t)(prom_mappings[i].va + off));
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}
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}
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return (caddr_t)0;
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}
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/*
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* Search the PROM page tables for OBIO mappings that
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* we would like to borrow.
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*/
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static void
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save_prom_mappings __P((void))
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{
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int *mon_pte;
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vm_offset_t va, pa;
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int i;
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/* Note: mon_ctbl[0] maps MON_KDB_START */
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mon_pte = *romVectorPtr->monptaddr;
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for (va = MON_KDB_START; va < MONEND;
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va += NBPG, mon_pte++)
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{
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/* Is this a valid mapping to OBIO? */
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/* XXX - Some macros would be nice... */
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if ((*mon_pte & 0xF0000003) != 0x60000001)
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continue;
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/* Yes it is. Is this a mapping we want? */
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pa = *mon_pte & MMU_SHORT_PTE_BASEADDR;
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for (i = 0; i < PROM_MAP_CNT; i++) {
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if (pa != prom_mappings[i].pa)
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continue;
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/* Yes, we want it. Save the va? */
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if (prom_mappings[i].va == 0) {
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prom_mappings[i].va = va;
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}
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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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* This function should make any required mappings that we
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* were not able to find among the PROM monitor's mappings.
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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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int i;
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for (i = 0; i < PROM_MAP_CNT; i++) {
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if (prom_mappings[i].va == 0) {
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/*
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* Actually, the PROM always has all the
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* "required" mappings we need, (smile)
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* but this makes sure that is true.
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*/
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mon_printf("obio: no mapping for pa=0x%x\n",
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prom_mappings[i].pa);
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sunmon_abort(); /* Ancient PROM? */
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}
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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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enable_reg = (short*) obio_find_mapping(OBIO_ENABLEREG, 2);
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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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/* Turn on the LEDs so we know power is on. */
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leds_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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