/* $NetBSD: obio.c,v 1.18 1996/03/26 15:16:14 gwr Exp $ */ /* * 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. */ #include #include #include #include #include #include #include #include static int obio_match __P((struct device *, void *, void *)); static void obio_attach __P((struct device *, struct device *, void *)); static int obio_print __P((void *, char *parentname)); struct cfattach obio_ca = { sizeof(struct device), obio_match, obio_attach }; struct cfdriver obio_cd = { NULL, "obio", DV_DULL }; static int obio_match(parent, vcf, aux) struct device *parent; void *vcf, *aux; { struct confargs *ca = aux; if (ca->ca_bustype != BUS_OBIO) return (0); return(1); } #define OBIO_INCR 0x020000 #define OBIO_END 0x200000 static void obio_attach(parent, self, aux) struct device *parent; struct device *self; void *aux; { struct confargs *ca = aux; int addr; printf("\n"); /* Configure these in order of address. */ for (addr = 0; addr < OBIO_END; addr += OBIO_INCR) { /* We know ca_bustype == BUS_OBIO */ ca->ca_paddr = addr; ca->ca_intpri = -1; ca->ca_intvec = -1; (void) config_found(self, ca, obio_print); } } /* * Print out the confargs. The (parent) name is non-NULL * when there was no match found by config_found(). */ static int obio_print(args, name) void *args; char *name; { struct confargs *ca = args; /* Be quiet about empty OBIO locations. */ if (name) return(QUIET); printf(" addr 0x%x", ca->ca_paddr); return(UNCONF); } /*****************************************************************/ /* * 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]; } 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)) == (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 */ } } } /* * 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++; } } /* * this routine "configures" any internal OBIO devices which must be * accessible before the mainline OBIO autoconfiguration as part of * configure(). */ void obio_init() { save_prom_mappings(); make_required_mappings(); } caddr_t obio_alloc(obio_addr, obio_size) int obio_addr, obio_size; { caddr_t cp; cp = obio_find_mapping((vm_offset_t)obio_addr, obio_size); if (cp) return (cp); cp = bus_mapin(BUS_OBIO, obio_addr, obio_size); return (cp); }