/* $NetBSD: obio.c,v 1.30 1997/04/28 22:02:43 gwr Exp $ */ /*- * Copyright (c) 1996 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Adam Glass and Gordon W. Ross. * * 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 the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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 #include static int obio_match __P((struct device *, struct cfdata *, void *)); static void obio_attach __P((struct device *, struct device *, void *)); static int obio_print __P((void *, const char *parentname)); static int obio_submatch __P((struct device *, struct cfdata *, void *)); struct cfattach obio_ca = { sizeof(struct device), obio_match, obio_attach }; struct cfdriver obio_cd = { NULL, "obio", DV_DULL }; static int obio_match(parent, cf, aux) struct device *parent; struct cfdata *cf; void *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) { /* Our parent set ca->ca_bustype already. */ ca->ca_paddr = addr; /* These are filled-in by obio_submatch. */ ca->ca_intpri = -1; ca->ca_intvec = -1; (void) config_found_sm(self, ca, obio_print, obio_submatch); } } /* * 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; const char *name; { /* Be quiet about empty OBIO locations. */ if (name) return(QUIET); /* Otherwise do the usual. */ return(bus_print(args, name)); } int obio_submatch(parent, cf, aux) struct device *parent; struct cfdata *cf; void *aux; { struct confargs *ca = aux; cfmatch_t submatch; /* * Note that a defaulted address locator can never match * the value of ca->ca_paddr set by the obio_attach loop. * Without this diagnostic, any device with a defaulted * address locator would always be silently unmatched. * Therefore, just disallow default addresses on OBIO. */ #ifdef DIAGNOSTIC if (cf->cf_paddr == -1) panic("obio_submatch: invalid address for: %s%d\n", cf->cf_driver->cd_name, cf->cf_unit); #endif /* * Note that obio_attach calls config_found_sm() with * this function as the "submatch" and ca->ca_paddr * set to each of the possible OBIO locations, so we * want to reject any unmatched address here. */ if (cf->cf_paddr != ca->ca_paddr) return 0; /* * Copy the locators into our confargs for the child. * Note: ca->ca_bustype was set by our parent driver * (mainbus) and ca->ca_paddr was set by obio_attach. */ ca->ca_intpri = cf->cf_intpri; ca->ca_intvec = -1; /* Now call the match function of the potential child. */ submatch = cf->cf_attach->ca_match; if (submatch == NULL) panic("obio_submatch: no match function for: %s\n", cf->cf_driver->cd_name); return ((*submatch)(parent, cf, aux)); } /*****************************************************************/ /* * 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 __P((void)) { vm_offset_t pa, segva, pgva; int pte, sme, i; segva = (vm_offset_t)MONSTART; while (segva < (vm_offset_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] = (caddr_t)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_ZS_KBD_MS, OBIO_ZS_TTY_AB, OBIO_EEPROM, OBIO_CLOCK, OBIO_MEMERR, OBIO_INTERREG, (vm_offset_t)-1, /* end marker */ }; static void make_required_mappings __P((void)) { vm_offset_t *rmp; 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); sunmon_abort(); } rmp++; } } /* * Find mappings for devices that are needed before autoconfiguration. * We first look for and record any useful PROM mappings, then call * the "init" functions for drivers that we need to use before the * normal autoconfiguration calls configure(). Warning: this is * called before pmap_bootstrap, so no allocation allowed! */ void obio_init() { save_prom_mappings(); make_required_mappings(); /* * Find the interrupt reg mapping and turn off the * interrupts, otherwise the PROM clock interrupt * would poll the zs and toggle some LEDs... */ intreg_init(); /* Make the zs driver ready for console duty. */ zs_init(); cninit(); } /* * This function is used by some OBIO drivers to conserve * kernel virtual space by sharing mappings made by the * PROM monitor. If we could not find any mapping made by * the PROM monitor, then make our own as usual. */ caddr_t obio_mapin(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); }