/* $NetBSD: mcclock_isa.c,v 1.22 2024/03/06 06:30:49 thorpej Exp $ */

/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
*  Software Distribution Coordinator  or  [email protected]
*  School of Computer Science
*  Carnegie Mellon University
*  Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: mcclock_isa.c,v 1.22 2024/03/06 06:30:49 thorpej Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <sys/bus.h>

#include <dev/clock_subr.h>

#include <dev/ic/mc146818reg.h>
#include <dev/ic/mc146818var.h>
#include <dev/isa/isavar.h>

#include <alpha/alpha/mcclockvar.h>

static int      mcclock_isa_match(device_t, cfdata_t, void *);
static void     mcclock_isa_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(mcclock_isa, sizeof(struct mcclock_softc),
   mcclock_isa_match, mcclock_isa_attach, NULL, NULL);

static void     mcclock_isa_write(struct mc146818_softc *, u_int, u_int);
static u_int    mcclock_isa_read(struct mc146818_softc *, u_int);

static int
mcclock_isa_match(device_t parent, cfdata_t cf, void *aux)
{
       struct isa_attach_args *ia = aux;
       bus_space_handle_t ioh;

       if (ia->ia_nio < 1 ||
           (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT &&
            ia->ia_io[0].ir_addr != 0x70))
               return (0);

       if (ia->ia_niomem > 0 &&
           (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM))
               return (0);

       if (ia->ia_nirq > 0 &&
           (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ))
               return (0);

       if (ia->ia_ndrq > 0 &&
           (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ))
               return (0);

       if (bus_space_map(ia->ia_iot, 0x70, 0x2, 0, &ioh))
               return (0);

       bus_space_unmap(ia->ia_iot, ioh, 0x2);

       ia->ia_nio = 1;
       ia->ia_io[0].ir_addr = 0x70;
       ia->ia_io[0].ir_size = 0x02;

       ia->ia_niomem = 0;
       ia->ia_nirq = 0;
       ia->ia_ndrq = 0;

       return (1);
}

static void
mcclock_isa_attach(device_t parent, device_t self, void *aux)
{
       struct mcclock_softc *msc = device_private(self);
       struct mc146818_softc *sc = &msc->sc_mc146818;
       struct isa_attach_args *ia = aux;

       sc->sc_dev = self;
       sc->sc_bst = ia->ia_iot;
       if (bus_space_map(sc->sc_bst, ia->ia_io[0].ir_addr,
           ia->ia_io[0].ir_size, 0, &sc->sc_bsh))
               panic("mcclock_isa_attach: couldn't map clock I/O space");

       sc->sc_mcread  = mcclock_isa_read;
       sc->sc_mcwrite = mcclock_isa_write;

       mcclock_attach(msc);
}

static void
mcclock_isa_write(struct mc146818_softc *sc, u_int reg, u_int datum)
{
       bus_space_tag_t iot = sc->sc_bst;
       bus_space_handle_t ioh = sc->sc_bsh;

       bus_space_write_1(iot, ioh, 0, reg);
       bus_space_write_1(iot, ioh, 1, datum);
}

static u_int
mcclock_isa_read(struct mc146818_softc *sc, u_int reg)
{
       bus_space_tag_t iot = sc->sc_bst;
       bus_space_handle_t ioh = sc->sc_bsh;

       bus_space_write_1(iot, ioh, 0, reg);
       return bus_space_read_1(iot, ioh, 1);
}