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      1 /*	$NetBSD: mcclock_mainbus.c,v 1.12 2011/07/09 16:03:01 matt Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1995, 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     31 
     32 __KERNEL_RCSID(0, "$NetBSD: mcclock_mainbus.c,v 1.12 2011/07/09 16:03:01 matt Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/bus.h>
     36 #include <sys/device.h>
     37 #include <sys/kernel.h>
     38 #include <sys/systm.h>
     39 
     40 #include <algor/autoconf.h>
     41 
     42 #include <dev/clock_subr.h>
     43 
     44 #include <dev/ic/mc146818reg.h>
     45 #include <dev/ic/mc146818var.h>
     46 
     47 int	mcclock_mainbus_match(device_t, cfdata_t, void *);
     48 void	mcclock_mainbus_attach(device_t, device_t, void *);
     49 
     50 CFATTACH_DECL_NEW(mcclock_mainbus, sizeof(struct mc146818_softc),
     51     mcclock_mainbus_match, mcclock_mainbus_attach, NULL, NULL);
     52 
     53 void	mcclock_mainbus_write(struct mc146818_softc *, u_int, u_int);
     54 u_int	mcclock_mainbus_read(struct mc146818_softc *, u_int);
     55 
     56 int
     57 mcclock_mainbus_match(device_t parent, cfdata_t cf, void *aux)
     58 {
     59 	struct mainbus_attach_args *ma = aux;
     60 
     61 	if (strcmp(ma->ma_name, cf->cf_name) == 0)
     62 		return (1);
     63 
     64 	return (0);
     65 }
     66 
     67 void
     68 mcclock_mainbus_attach(device_t parent, device_t self, void *aux)
     69 {
     70 	struct mc146818_softc *sc = device_private(self);
     71 	struct mainbus_attach_args *ma = aux;
     72 
     73 	sc->sc_dev = self;
     74 	sc->sc_bst = ma->ma_st;
     75 	if (bus_space_map(sc->sc_bst, ma->ma_addr, 2, 0, &sc->sc_bsh))
     76 		panic("mcclock_mainbus_attach: couldn't map clock I/O space");
     77 
     78 	/*
     79 	 * Turn interrupts off, just in case.  Need to leave the SQWE
     80 	 * set, because that's the DRAM refresh signal on Rev. B boards.
     81 	 */
     82 	mcclock_mainbus_write(sc, MC_REGB, MC_REGB_SQWE | MC_REGB_BINARY |
     83 	    MC_REGB_24HR);
     84 
     85 	sc->sc_mcread = mcclock_mainbus_read;
     86 	sc->sc_mcwrite = mcclock_mainbus_write;
     87 	sc->sc_getcent = NULL;
     88 	sc->sc_setcent = NULL;
     89 	sc->sc_flag = 0;
     90 
     91 	/* Algor uses year 1980 as offset */
     92 	sc->sc_year0 = 1980;
     93 
     94 	mc146818_attach(sc);
     95 
     96 	aprint_normal("\n");
     97 }
     98 
     99 void
    100 mcclock_mainbus_write(struct mc146818_softc *sc, u_int reg, u_int datum)
    101 {
    102 	bus_space_tag_t iot = sc->sc_bst;
    103 	bus_space_handle_t ioh = sc->sc_bsh;
    104 
    105 	bus_space_write_1(iot, ioh, 0, reg);
    106 	bus_space_write_1(iot, ioh, 1, datum);
    107 }
    108 
    109 u_int
    110 mcclock_mainbus_read(struct mc146818_softc *sc, u_int reg)
    111 {
    112 	bus_space_tag_t iot = sc->sc_bst;
    113 	bus_space_handle_t ioh = sc->sc_bsh;
    114 
    115 	bus_space_write_1(iot, ioh, 0, reg);
    116 	return bus_space_read_1(iot, ioh, 1);
    117 }
    118