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mcclock_ioasic.c revision 1.2 
      1 /* $NetBSD: mcclock_ioasic.c,v 1.2 1997/07/22 04:50:04 jonathan 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 1.2 1997/07/22 04:50:04 jonathan 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 <machine/autoconf.h>
     40 #include <dev/dec/clockvar.h>
     41 #include <dev/tc/mcclockvar.h>
     42 #include <dev/ic/mc146818reg.h>
     43 #include <dev/tc/tcreg.h>
     44 #include <dev/tc/tcvar.h>
     45 #include <dev/tc/ioasicvar.h>                   /* XXX */
     46 
     47 struct mcclock_ioasic_clockdatum {
     48 	u_char	datum;
     49 	char	pad[3];
     50 };
     51 
     52 struct mcclock_ioasic_softc {
     53 	struct mcclock_softc	sc_mcclock;
     54 
     55 	struct mcclock_ioasic_clockdatum *sc_dp;
     56 };
     57 
     58 int	mcclock_ioasic_match __P((struct device *, struct cfdata *, void *));
     59 void	mcclock_ioasic_attach __P((struct device *, struct device *, void *));
     60 
     61 struct cfattach mcclock_ioasic_ca = {
     62 	sizeof (struct mcclock_ioasic_softc), (void *)mcclock_ioasic_match,
     63 	    mcclock_ioasic_attach,
     64 };
     65 
     66 void	mcclock_ioasic_write __P((struct mcclock_softc *, u_int, u_int));
     67 u_int	mcclock_ioasic_read __P((struct mcclock_softc *, u_int));
     68 
     69 const struct mcclock_busfns mcclock_ioasic_busfns = {
     70 	mcclock_ioasic_write, mcclock_ioasic_read,
     71 };
     72 
     73 volatile struct chiptime *Mach_clock_addr; /* XXX glue for pmax heritage */
     74 
     75 int
     76 mcclock_ioasic_match(parent, match, aux)
     77 	struct device *parent;
     78 	struct cfdata *match;
     79 	void *aux;
     80 {
     81 #define	CFMATCH(cf,x) !strcmp((cf)->dv_cfdata->cf_driver->cd_name,(x))
     82 	char *name;
     83 	vm_offset_t addr;
     84 
     85 	if (CFMATCH(parent, "mainbus")) {
     86 		struct confargs *ca = aux;
     87 		addr = (vm_offset_t)ca->ca_addr;
     88 		name = ca->ca_name;
     89 	}
     90 	else
     91 	if (CFMATCH(parent, "asic")) {
     92 		struct ioasicdev_attach_args *d = aux;
     93 		addr = d->iada_addr;
     94 		name = d->iada_modname;
     95 	}
     96 	else {
     97 		/*panic("clock must be attached with mainbus or ioasic\n");*/
     98 		printf("clock on %s: must be attached at mainbus or ioasic\n",
     99 		       parent->dv_cfdata->cf_driver->cd_name);
    100 		return(0);
    101 	}
    102 	if (strcmp("mc146818", name))
    103 		return (0);
    104 	Mach_clock_addr = (struct chiptime *)MIPS_PHYS_TO_KSEG1(addr);
    105 	return (1);
    106 #undef	CFMATCH
    107 }
    108 
    109 void
    110 mcclock_ioasic_attach(parent, self, aux)
    111 	struct device *parent, *self;
    112 	void *aux;
    113 {
    114 	struct ioasicdev_attach_args *ioasicdev = aux;
    115 	struct mcclock_ioasic_softc *sc = (struct mcclock_ioasic_softc *)self;
    116 
    117 	sc->sc_dp = (struct mcclock_ioasic_clockdatum *)ioasicdev->iada_addr;
    118 
    119 	mcclock_attach(&sc->sc_mcclock, &mcclock_ioasic_busfns);
    120 }
    121 
    122 void
    123 mcclock_ioasic_write(dev, reg, datum)
    124 	struct mcclock_softc *dev;
    125 	u_int reg, datum;
    126 {
    127 	struct mcclock_ioasic_softc *sc = (struct mcclock_ioasic_softc *)dev;
    128 
    129 	sc->sc_dp[reg].datum = datum;
    130 }
    131 
    132 u_int
    133 mcclock_ioasic_read(dev, reg)
    134 	struct mcclock_softc *dev;
    135 	u_int reg;
    136 {
    137 	struct mcclock_ioasic_softc *sc = (struct mcclock_ioasic_softc *)dev;
    138 
    139 	return (sc->sc_dp[reg].datum);
    140 }
    141 
    142 /*XXX*/
    143 /*
    144  * Wait "n" microseconds. (scsi code needs this).
    145  */
    146 void
    147 delay(n)
    148         int n;
    149 {
    150         DELAY(n);
    151 }
    152