/* $NetBSD: mkclock.c,v 1.12 2012/10/27 17:18:12 chs Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * Copyright (c) 1994 Gordon W. Ross * Copyright (c) 1993 Adam Glass * Copyright (c) 1996 Paul Kranenburg * Copyright (c) 1996 * The President and Fellows of Harvard College. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Harvard University. * This product includes software developed by the University of * California, Lawrence Berkeley Laboratory. * * 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 University of * California, Berkeley and its contributors. * This product includes software developed by Paul Kranenburg. * This product includes software developed by Harvard University. * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. * * @(#)clock.c 8.1 (Berkeley) 6/11/93 * */ #include __KERNEL_RCSID(0, "$NetBSD: mkclock.c,v 1.12 2012/10/27 17:18:12 chs Exp $"); /* * Clock driver for 'mkclock' - Mostek MK48Txx TOD clock. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * clock (eeprom) attaches at the sbus or the ebus (PCI) */ static int mkclock_sbus_match(device_t, cfdata_t, void *); static void mkclock_sbus_attach(device_t, device_t, void *); static int mkclock_ebus_match(device_t, cfdata_t, void *); static void mkclock_ebus_attach(device_t, device_t, void *); static int mkclock_fhc_match(device_t, cfdata_t, void *); static void mkclock_fhc_attach(device_t, device_t, void *); static void mkclock_attach(struct mk48txx_softc *, int); static int mkclock_wenable(struct todr_chip_handle *, int); CFATTACH_DECL_NEW(mkclock_sbus, sizeof(struct mk48txx_softc), mkclock_sbus_match, mkclock_sbus_attach, NULL, NULL); CFATTACH_DECL_NEW(mkclock_ebus, sizeof(struct mk48txx_softc), mkclock_ebus_match, mkclock_ebus_attach, NULL, NULL); CFATTACH_DECL_NEW(mkclock_fhc, sizeof(struct mk48txx_softc), mkclock_fhc_match, mkclock_fhc_attach, NULL, NULL); /* * The OPENPROM calls the clock the "eeprom", so we have to have our * own special match function to call it the "clock". */ static int mkclock_sbus_match(device_t parent, cfdata_t cf, void *aux) { struct sbus_attach_args *sa = aux; return (strcmp("eeprom", sa->sa_name) == 0); } static int mkclock_ebus_match(device_t parent, cfdata_t cf, void *aux) { struct ebus_attach_args *ea = aux; return (strcmp("eeprom", ea->ea_name) == 0); } static int mkclock_fhc_match(device_t parent, cfdata_t cf, void *aux) { struct fhc_attach_args *fa = aux; return (strcmp("eeprom", fa->fa_name) == 0); } /* * Attach a clock (really `eeprom') to the sbus or ebus. * * We ignore any existing virtual address as we need to map * this read-only and make it read-write only temporarily, * whenever we read or write the clock chip. The clock also * contains the ID ``PROM'', and I have already had the pleasure * of reloading the CPU type, Ethernet address, etc, by hand from * the console FORTH interpreter. I intend not to enjoy it again. * * the MK48T02 is 2K. the MK48T08 is 8K, and the MK48T59 is * supposed to be identical to it. * * This is *UGLY*! We probably have multiple mappings. But I do * know that this all fits inside an 8K page, so I'll just map in * once. * * What we really need is some way to record the bus attach args * so we can call *_bus_map() later with BUS_SPACE_MAP_READONLY * or not to write enable/disable the device registers. This is * a non-trivial operation. */ /* ARGSUSED */ static void mkclock_sbus_attach(device_t parent, device_t self, void *aux) { struct mk48txx_softc *sc = device_private(self); struct sbus_attach_args *sa = aux; int sz; sc->sc_dev = self; sc->sc_bst = sa->sa_bustag; /* use sa->sa_regs[0].size? */ sz = 8192; if (sbus_bus_map(sc->sc_bst, sa->sa_slot, trunc_page(sa->sa_offset), sz, BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_READONLY, &sc->sc_bsh) != 0) { aprint_error(": can't map register\n"); return; } mkclock_attach(sc, sa->sa_node); } /* ARGSUSED */ static void mkclock_ebus_attach(device_t parent, device_t self, void *aux) { struct mk48txx_softc *sc = device_private(self); struct ebus_attach_args *ea = aux; int sz; sc->sc_dev = self; sc->sc_bst = ea->ea_bustag; /* hard code to 8K? */ sz = ea->ea_reg[0].size; /* Use the PROM address if there. */ if (ea->ea_nvaddr) sparc_promaddr_to_handle(sc->sc_bst, ea->ea_vaddr[0], &sc->sc_bsh); else if (bus_space_map(sc->sc_bst, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), sz, BUS_SPACE_MAP_LINEAR, &sc->sc_bsh) != 0) { aprint_error(": can't map register\n"); return; } mkclock_attach(sc, ea->ea_node); } /* ARGSUSED */ static void mkclock_fhc_attach(device_t parent, device_t self, void *aux) { struct mk48txx_softc *sc = device_private(self); struct fhc_attach_args *fa = aux; sc->sc_dev = self; sc->sc_bst = fa->fa_bustag; if (fhc_bus_map(sc->sc_bst, fa->fa_reg[0].fbr_slot, (fa->fa_reg[0].fbr_offset & ~NBPG), fa->fa_reg[0].fbr_size, BUS_SPACE_MAP_LINEAR, &sc->sc_bsh) != 0) { aprint_error(": can't map register\n"); return; } mkclock_attach(sc, fa->fa_node); } static void mkclock_attach(struct mk48txx_softc *sc, int node) { sc->sc_model = prom_getpropstring(node, "model"); #ifdef DIAGNOSTIC if (sc->sc_model == NULL) panic("clockattach: no model property"); #endif /* Our TOD clock year 0 is 1968 */ sc->sc_year0 = 1968; /* Save info for the clock wenable call. */ sc->sc_handle.todr_setwen = mkclock_wenable; mk48txx_attach(sc); aprint_normal("\n"); } /* * Write en/dis-able clock registers. We coordinate so that several * writers can run simultaneously. */ static int mkclock_wenable(struct todr_chip_handle *handle, int onoff) { struct mk48txx_softc *sc; vm_prot_t prot; vaddr_t va; int s, err = 0; static int writers; /* XXXSMP */ s = splhigh(); if (onoff) prot = writers++ == 0 ? VM_PROT_READ|VM_PROT_WRITE : 0; else prot = --writers == 0 ? VM_PROT_READ : 0; splx(s); if (prot == VM_PROT_NONE) { return 0; } sc = handle->cookie; va = (vaddr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh); if (va == 0UL) { printf("clock_wenable: WARNING -- cannot get va\n"); return EIO; } pmap_kprotect(va, prot); return (err); }