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      1 /*	$NetBSD: mcclock.c,v 1.5 2011/07/01 20:36:42 dyoung 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>
     31 __KERNEL_RCSID(0, "$NetBSD: mcclock.c,v 1.5 2011/07/01 20:36:42 dyoung Exp $");
     32 
     33 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
     34 
     35 #include <sys/param.h>
     36 #include <sys/kernel.h>
     37 #include <sys/systm.h>
     38 #include <sys/device.h>
     39 
     40 #include <machine/autoconf.h>
     41 #include <sys/bus.h>
     42 
     43 #include <dev/clock_subr.h>
     44 #include <dev/ic/mc146818reg.h>
     45 #include <dev/ic/mc146818var.h>
     46 
     47 #define	MCCLOCK_NPORTS	2
     48 
     49 static int mcclock_match(device_t, cfdata_t, void *);
     50 static void mcclock_attach(device_t, device_t, void *);
     51 
     52 CFATTACH_DECL_NEW(mcclock, sizeof (struct mc146818_softc),
     53     mcclock_match, mcclock_attach, NULL, NULL);
     54 
     55 static void mcclock_write(struct mc146818_softc *, u_int, u_int);
     56 static u_int mcclock_read(struct mc146818_softc *, u_int);
     57 
     58 
     59 static int
     60 mcclock_match(device_t parent, cfdata_t cf, void *aux)
     61 {
     62 	static int mcclock_found;
     63 
     64 	if (mcclock_found)
     65 		return 0;
     66 
     67 	mcclock_found = 1;
     68 
     69 	return 1;
     70 }
     71 
     72 static void
     73 mcclock_attach(device_t parent, device_t self, void *aux)
     74 {
     75 	struct mc146818_softc *sc = device_private(self);
     76 	struct mainbus_attach_args *ma = aux;
     77 
     78 	sc->sc_dev = self;
     79 	sc->sc_bst = ma->ma_iot;
     80 	if (bus_space_map(sc->sc_bst, ma->ma_addr, MCCLOCK_NPORTS,
     81 	    0, &sc->sc_bsh)) {
     82 		aprint_error("mcclock_attach: unable to map registers\n");
     83 		return;
     84 	}
     85 
     86 	sc->sc_year0 = 2000;
     87 	sc->sc_mcread = mcclock_read;
     88 	sc->sc_mcwrite = mcclock_write;
     89 	sc->sc_flag = MC146818_BCD;
     90 	mc146818_attach(sc);
     91 
     92 	aprint_normal("\n");
     93 
     94 	(*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR);
     95 }
     96 
     97 static void
     98 mcclock_write(struct mc146818_softc *sc, u_int reg, u_int datum)
     99 {
    100 	bus_space_tag_t iot;
    101 	bus_space_handle_t ioh;
    102 
    103 	iot = sc->sc_bst;
    104 	ioh = sc->sc_bsh;
    105 
    106 	bus_space_write_1(iot, ioh, 0, reg);
    107 	bus_space_write_1(iot, ioh, 1, datum);
    108 }
    109 
    110 static u_int
    111 mcclock_read(struct mc146818_softc *sc, u_int reg)
    112 {
    113 	bus_space_tag_t iot;
    114 	bus_space_handle_t ioh;
    115 	u_int datum;
    116 
    117 	iot = sc->sc_bst;
    118 	ioh = sc->sc_bsh;
    119 
    120 	bus_space_write_1(iot, ioh, 0, reg);
    121 	datum = bus_space_read_1(iot, ioh, 1);
    122 
    123 	return datum;
    124 }
    125