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      1 /*	$NetBSD: mcclock_frodo.c,v 1.2 2023/01/15 06:19:45 tsutsui Exp $	*/
      2 /*-
      3  * Copyright (c) 2014 Izumi Tsutsui.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: mcclock_frodo.c,v 1.2 2023/01/15 06:19:45 tsutsui Exp $");
     28 
     29 #include <sys/param.h>
     30 #include <sys/device.h>
     31 #include <sys/bus.h>
     32 
     33 #include <machine/cpu.h>
     34 
     35 #include <dev/clock_subr.h>
     36 #include <dev/ic/mc146818reg.h>
     37 #include <dev/ic/mc146818var.h>
     38 
     39 #include <hp300/dev/frodoreg.h>
     40 #include <hp300/dev/frodovar.h>
     41 
     42 #include "ioconf.h"
     43 
     44 static int	mcclock_frodo_probe(device_t, cfdata_t, void *);
     45 static void	mcclock_frodo_attach(device_t, device_t, void *);
     46 
     47 static u_int	mcclock_frodo_read(struct mc146818_softc *, u_int);
     48 static void	mcclock_frodo_write(struct mc146818_softc *, u_int, u_int);
     49 
     50 CFATTACH_DECL_NEW(mcclock_frodo, sizeof(struct mc146818_softc),
     51     mcclock_frodo_probe, mcclock_frodo_attach, NULL, NULL);
     52 
     53 #define	MCCLOCK_FRODO_NPORTS	2
     54 
     55 static int
     56 mcclock_frodo_probe(device_t parent, cfdata_t cf, void *aux)
     57 {
     58 	struct frodo_attach_args *fa = aux;
     59 
     60 	/* only 425e has a valid mcclock */
     61 	if (machineid != HP_425 || mmuid != MMUID_425_E)
     62 		return 0;
     63 
     64 	if (strcmp(fa->fa_name, mcclock_cd.cd_name) != 0)
     65 		return 0;
     66 
     67 	if (fa->fa_offset != FRODO_CALENDAR)
     68 		return 0;
     69 
     70 	return 1;
     71 }
     72 
     73 static void
     74 mcclock_frodo_attach(device_t parent, device_t self, void *aux)
     75 {
     76 	struct mc146818_softc *sc = device_private(self);
     77 	struct frodo_attach_args *fa = aux;
     78 
     79 	sc->sc_dev = self;
     80 	sc->sc_bst = fa->fa_bst;
     81 
     82 	if (bus_space_map(sc->sc_bst, fa->fa_base + fa->fa_offset,
     83 	    MCCLOCK_FRODO_NPORTS << 2, 0, &sc->sc_bsh) != 0) {
     84 		aprint_error(": can't map register\n");
     85 		return;
     86 	}
     87 
     88 	sc->sc_year0 = 1900;
     89 	sc->sc_mcread = mcclock_frodo_read;
     90 	sc->sc_mcwrite = mcclock_frodo_write;
     91 	sc->sc_flag = 0;
     92 	mc146818_attach(sc);
     93 
     94 	aprint_normal("\n");
     95 
     96 	/* XXX: not sure which mode (BINARY or BCD) is used on HP-UX */
     97 	mcclock_frodo_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
     98 
     99 	/* make sure to start the 32.768kHz OSC */
    100 	mcclock_frodo_write(sc, MC_REGA,
    101 	    (mcclock_frodo_read(sc, MC_REGA) & ~MC_REGA_DVMASK) |
    102 	    MC_BASE_32_KHz);
    103 }
    104 
    105 /*
    106  * mc146818 calendar chip in the frodo utility chip is can be accessed
    107  * via register port at offset 0x80 and data port at offset 0x84.
    108  *
    109  * Note 4 byte offset stride is handled by frodo bus_space(9) layer,
    110  * so bus_space_read(9) and bus_space_write(9) takes 0 or 1 as offset
    111  * to access these registers.
    112  */
    113 
    114 static void
    115 mcclock_frodo_write(struct mc146818_softc *sc, u_int reg, u_int datum)
    116 {
    117 	bus_space_tag_t iot;
    118 	bus_space_handle_t ioh;
    119 
    120 	iot = sc->sc_bst;
    121 	ioh = sc->sc_bsh;
    122 
    123 	bus_space_write_1(iot, ioh, 0, reg);
    124 	bus_space_write_1(iot, ioh, 1, datum);
    125 }
    126 
    127 static u_int
    128 mcclock_frodo_read(struct mc146818_softc *sc, u_int reg)
    129 {
    130 	bus_space_tag_t iot;
    131 	bus_space_handle_t ioh;
    132 	u_int datum;
    133 
    134 	iot = sc->sc_bst;
    135 	ioh = sc->sc_bsh;
    136 
    137 	bus_space_write_1(iot, ioh, 0, reg);
    138 	datum = bus_space_read_1(iot, ioh, 1);
    139 
    140 	return datum;
    141 }
    142