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      1 /* $NetBSD: mcclock_ioasic.c,v 1.19 2024/03/06 06:30:49 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994, 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_ioasic.c,v 1.19 2024/03/06 06:30:49 thorpej Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/kernel.h>
     36 #include <sys/systm.h>
     37 #include <sys/device.h>
     38 
     39 #include <sys/bus.h>
     40 
     41 #include <dev/clock_subr.h>
     42 
     43 #include <dev/ic/mc146818reg.h>
     44 #include <dev/ic/mc146818var.h>
     45 #include <dev/tc/tcvar.h>
     46 #include <dev/tc/ioasicvar.h>                   /* XXX */
     47 
     48 #include <alpha/alpha/mcclockvar.h>
     49 
     50 struct mcclock_ioasic_clockdatum {
     51 	u_char	datum;
     52 	char	pad[3];
     53 };
     54 
     55 struct mcclock_ioasic_softc {
     56 	struct mcclock_softc	sc_mcclock;
     57 
     58 	struct mcclock_ioasic_clockdatum *sc_dp;
     59 };
     60 
     61 static int	mcclock_ioasic_match(device_t, cfdata_t, void *);
     62 static void	mcclock_ioasic_attach(device_t, device_t, void *);
     63 
     64 CFATTACH_DECL_NEW(mcclock_ioasic, sizeof(struct mcclock_ioasic_softc),
     65     mcclock_ioasic_match, mcclock_ioasic_attach, NULL, NULL);
     66 
     67 static void	mcclock_ioasic_write(struct mc146818_softc *, u_int, u_int);
     68 static u_int	mcclock_ioasic_read(struct mc146818_softc *, u_int);
     69 
     70 static int
     71 mcclock_ioasic_match(device_t parent, cfdata_t cf, void *aux)
     72 {
     73 	struct ioasicdev_attach_args *d = aux;
     74 
     75 	if (strncmp("TOY_RTC ", d->iada_modname, TC_ROM_LLEN))
     76 		return (0);
     77 
     78 	return (1);
     79 }
     80 
     81 static void
     82 mcclock_ioasic_attach(device_t parent, device_t self, void *aux)
     83 {
     84 	struct mcclock_ioasic_softc *isc = device_private(self);
     85 	struct ioasicdev_attach_args *ioasicdev = aux;
     86 	struct mc146818_softc *sc = &isc->sc_mcclock.sc_mc146818;
     87 
     88 	/* XXX no bus_space(9) for TURBOchannel yet */
     89 	isc->sc_dp = (void *)ioasicdev->iada_addr;
     90 
     91 	sc->sc_dev = self;
     92 	sc->sc_mcread = mcclock_ioasic_read;
     93 	sc->sc_mcwrite = mcclock_ioasic_write;
     94 
     95 	/* call alpha common mcclock attachment */
     96 	mcclock_attach(&isc->sc_mcclock);
     97 }
     98 
     99 static void
    100 mcclock_ioasic_write(struct mc146818_softc *sc, u_int reg, u_int datum)
    101 {
    102 	struct mcclock_ioasic_softc *isc = (void *)sc;
    103 
    104 	isc->sc_dp[reg].datum = datum;
    105 }
    106 
    107 static u_int
    108 mcclock_ioasic_read(struct mc146818_softc *sc, u_int reg)
    109 {
    110 	struct mcclock_ioasic_softc *isc = (void *)sc;
    111 
    112 	return isc->sc_dp[reg].datum;
    113 }
    114