299 lines
8.4 KiB
C
299 lines
8.4 KiB
C
/* $NetBSD: mkclock.c,v 1.12 2012/10/27 17:18:12 chs Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1994 Gordon W. Ross
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* Copyright (c) 1993 Adam Glass
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* Copyright (c) 1996 Paul Kranenburg
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* Copyright (c) 1996
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* The President and Fellows of Harvard College. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* 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 Harvard University.
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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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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*
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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 University of
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* California, Berkeley and its contributors.
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* This product includes software developed by Paul Kranenburg.
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* This product includes software developed by Harvard University.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)clock.c 8.1 (Berkeley) 6/11/93
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*
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: mkclock.c,v 1.12 2012/10/27 17:18:12 chs Exp $");
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/*
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* Clock driver for 'mkclock' - Mostek MK48Txx TOD clock.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <uvm/uvm_extern.h>
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#include <sys/bus.h>
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#include <machine/autoconf.h>
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#include <machine/eeprom.h>
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#include <machine/cpu.h>
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#include <dev/clock_subr.h>
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#include <dev/ic/mk48txxreg.h>
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#include <dev/ic/mk48txxvar.h>
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#include <dev/sbus/sbusvar.h>
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#include <dev/ebus/ebusreg.h>
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#include <dev/ebus/ebusvar.h>
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#include <sparc64/dev/fhcvar.h>
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/*
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* clock (eeprom) attaches at the sbus or the ebus (PCI)
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*/
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static int mkclock_sbus_match(device_t, cfdata_t, void *);
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static void mkclock_sbus_attach(device_t, device_t, void *);
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static int mkclock_ebus_match(device_t, cfdata_t, void *);
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static void mkclock_ebus_attach(device_t, device_t, void *);
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static int mkclock_fhc_match(device_t, cfdata_t, void *);
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static void mkclock_fhc_attach(device_t, device_t, void *);
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static void mkclock_attach(struct mk48txx_softc *, int);
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static int mkclock_wenable(struct todr_chip_handle *, int);
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CFATTACH_DECL_NEW(mkclock_sbus, sizeof(struct mk48txx_softc),
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mkclock_sbus_match, mkclock_sbus_attach, NULL, NULL);
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CFATTACH_DECL_NEW(mkclock_ebus, sizeof(struct mk48txx_softc),
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mkclock_ebus_match, mkclock_ebus_attach, NULL, NULL);
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CFATTACH_DECL_NEW(mkclock_fhc, sizeof(struct mk48txx_softc),
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mkclock_fhc_match, mkclock_fhc_attach, NULL, NULL);
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/*
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* The OPENPROM calls the clock the "eeprom", so we have to have our
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* own special match function to call it the "clock".
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*/
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static int
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mkclock_sbus_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct sbus_attach_args *sa = aux;
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return (strcmp("eeprom", sa->sa_name) == 0);
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}
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static int
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mkclock_ebus_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct ebus_attach_args *ea = aux;
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return (strcmp("eeprom", ea->ea_name) == 0);
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}
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static int
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mkclock_fhc_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct fhc_attach_args *fa = aux;
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return (strcmp("eeprom", fa->fa_name) == 0);
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}
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/*
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* Attach a clock (really `eeprom') to the sbus or ebus.
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*
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* We ignore any existing virtual address as we need to map
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* this read-only and make it read-write only temporarily,
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* whenever we read or write the clock chip. The clock also
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* contains the ID ``PROM'', and I have already had the pleasure
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* of reloading the CPU type, Ethernet address, etc, by hand from
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* the console FORTH interpreter. I intend not to enjoy it again.
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*
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* the MK48T02 is 2K. the MK48T08 is 8K, and the MK48T59 is
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* supposed to be identical to it.
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*
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* This is *UGLY*! We probably have multiple mappings. But I do
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* know that this all fits inside an 8K page, so I'll just map in
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* once.
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*
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* What we really need is some way to record the bus attach args
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* so we can call *_bus_map() later with BUS_SPACE_MAP_READONLY
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* or not to write enable/disable the device registers. This is
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* a non-trivial operation.
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*/
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/* ARGSUSED */
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static void
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mkclock_sbus_attach(device_t parent, device_t self, void *aux)
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{
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struct mk48txx_softc *sc = device_private(self);
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struct sbus_attach_args *sa = aux;
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int sz;
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sc->sc_dev = self;
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sc->sc_bst = sa->sa_bustag;
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/* use sa->sa_regs[0].size? */
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sz = 8192;
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if (sbus_bus_map(sc->sc_bst,
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sa->sa_slot,
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trunc_page(sa->sa_offset),
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sz,
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BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_READONLY,
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&sc->sc_bsh) != 0) {
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aprint_error(": can't map register\n");
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return;
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}
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mkclock_attach(sc, sa->sa_node);
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}
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/* ARGSUSED */
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static void
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mkclock_ebus_attach(device_t parent, device_t self, void *aux)
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{
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struct mk48txx_softc *sc = device_private(self);
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struct ebus_attach_args *ea = aux;
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int sz;
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sc->sc_dev = self;
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sc->sc_bst = ea->ea_bustag;
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/* hard code to 8K? */
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sz = ea->ea_reg[0].size;
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/* Use the PROM address if there. */
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if (ea->ea_nvaddr)
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sparc_promaddr_to_handle(sc->sc_bst, ea->ea_vaddr[0],
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&sc->sc_bsh);
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else if (bus_space_map(sc->sc_bst,
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EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
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sz,
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BUS_SPACE_MAP_LINEAR,
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&sc->sc_bsh) != 0) {
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aprint_error(": can't map register\n");
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return;
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}
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mkclock_attach(sc, ea->ea_node);
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}
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/* ARGSUSED */
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static void
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mkclock_fhc_attach(device_t parent, device_t self, void *aux)
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{
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struct mk48txx_softc *sc = device_private(self);
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struct fhc_attach_args *fa = aux;
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sc->sc_dev = self;
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sc->sc_bst = fa->fa_bustag;
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if (fhc_bus_map(sc->sc_bst,
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fa->fa_reg[0].fbr_slot,
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(fa->fa_reg[0].fbr_offset & ~NBPG),
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fa->fa_reg[0].fbr_size,
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BUS_SPACE_MAP_LINEAR,
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&sc->sc_bsh) != 0) {
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aprint_error(": can't map register\n");
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return;
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}
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mkclock_attach(sc, fa->fa_node);
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}
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static void
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mkclock_attach(struct mk48txx_softc *sc, int node)
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{
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sc->sc_model = prom_getpropstring(node, "model");
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#ifdef DIAGNOSTIC
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if (sc->sc_model == NULL)
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panic("clockattach: no model property");
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#endif
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/* Our TOD clock year 0 is 1968 */
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sc->sc_year0 = 1968;
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/* Save info for the clock wenable call. */
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sc->sc_handle.todr_setwen = mkclock_wenable;
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mk48txx_attach(sc);
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aprint_normal("\n");
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}
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/*
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* Write en/dis-able clock registers. We coordinate so that several
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* writers can run simultaneously.
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*/
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static int
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mkclock_wenable(struct todr_chip_handle *handle, int onoff)
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{
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struct mk48txx_softc *sc;
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vm_prot_t prot;
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vaddr_t va;
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int s, err = 0;
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static int writers;
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/* XXXSMP */
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s = splhigh();
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if (onoff)
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prot = writers++ == 0 ? VM_PROT_READ|VM_PROT_WRITE : 0;
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else
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prot = --writers == 0 ? VM_PROT_READ : 0;
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splx(s);
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if (prot == VM_PROT_NONE) {
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return 0;
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}
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sc = handle->cookie;
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va = (vaddr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh);
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if (va == 0UL) {
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printf("clock_wenable: WARNING -- cannot get va\n");
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return EIO;
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}
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pmap_kprotect(va, prot);
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return (err);
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}
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