/*      $NetBSD: mkclock.c,v 1.13 2023/12/20 05:33:58 thorpej Exp $ */

/*
* Copyright (c) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
* Copyright (c) 1994 Gordon W. Ross
* Copyright (c) 1993 Adam Glass
* Copyright (c) 1996 Paul Kranenburg
* Copyright (c) 1996
*      The President and Fellows of Harvard College. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
*      This product includes software developed by Harvard University.
*      This product includes software developed by the University of
*      California, Lawrence Berkeley Laboratory.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
*      This product includes software developed by Paul Kranenburg.
*      This product includes software developed by Harvard University.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)clock.c     8.1 (Berkeley) 6/11/93
*
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mkclock.c,v 1.13 2023/12/20 05:33:58 thorpej Exp $");

/*
* Clock driver for 'mkclock' - Mostek MK48Txx TOD clock.
*/

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

#include <uvm/uvm_extern.h>

#include <sys/bus.h>
#include <machine/autoconf.h>
#include <machine/eeprom.h>
#include <machine/cpu.h>

#include <dev/clock_subr.h>
#include <dev/ic/mk48txxreg.h>
#include <dev/ic/mk48txxvar.h>

#include <dev/sbus/sbusvar.h>
#include <dev/ebus/ebusreg.h>
#include <dev/ebus/ebusvar.h>

#include <sparc64/dev/fhcvar.h>

/*
* clock (eeprom) attaches at the sbus or the ebus (PCI)
*/
static int      mkclock_sbus_match(device_t, cfdata_t, void *);
static void     mkclock_sbus_attach(device_t, device_t, void *);

static int      mkclock_ebus_match(device_t, cfdata_t, void *);
static void     mkclock_ebus_attach(device_t, device_t, void *);

static int      mkclock_fhc_match(device_t, cfdata_t, void *);
static void     mkclock_fhc_attach(device_t, device_t, void *);

static void     mkclock_attach(struct mk48txx_softc *, int);

static int      mkclock_wenable(struct todr_chip_handle *, int);


CFATTACH_DECL_NEW(mkclock_sbus, sizeof(struct mk48txx_softc),
   mkclock_sbus_match, mkclock_sbus_attach, NULL, NULL);

CFATTACH_DECL_NEW(mkclock_ebus, sizeof(struct mk48txx_softc),
   mkclock_ebus_match, mkclock_ebus_attach, NULL, NULL);

CFATTACH_DECL_NEW(mkclock_fhc, sizeof(struct mk48txx_softc),
   mkclock_fhc_match, mkclock_fhc_attach, NULL, NULL);

/*
* The OPENPROM calls the clock the "eeprom", so we have to have our
* own special match function to call it the "clock".
*/
static int
mkclock_sbus_match(device_t parent, cfdata_t cf, void *aux)
{
       struct sbus_attach_args *sa = aux;

       return (strcmp("eeprom", sa->sa_name) == 0);
}

static int
mkclock_ebus_match(device_t parent, cfdata_t cf, void *aux)
{
       struct ebus_attach_args *ea = aux;

       return (strcmp("eeprom", ea->ea_name) == 0);
}

static int
mkclock_fhc_match(device_t parent, cfdata_t cf, void *aux)
{
       struct fhc_attach_args *fa = aux;

       return (strcmp("eeprom", fa->fa_name) == 0);
}

/*
* Attach a clock (really `eeprom') to the sbus or ebus.
*
* We ignore any existing virtual address as we need to map
* this read-only and make it read-write only temporarily,
* whenever we read or write the clock chip.  The clock also
* contains the ID ``PROM'', and I have already had the pleasure
* of reloading the CPU type, Ethernet address, etc, by hand from
* the console FORTH interpreter.  I intend not to enjoy it again.
*
* the MK48T02 is 2K.  the MK48T08 is 8K, and the MK48T59 is
* supposed to be identical to it.
*
* This is *UGLY*!  We probably have multiple mappings.  But I do
* know that this all fits inside an 8K page, so I'll just map in
* once.
*
* What we really need is some way to record the bus attach args
* so we can call *_bus_map() later with BUS_SPACE_MAP_READONLY
* or not to write enable/disable the device registers.  This is
* a non-trivial operation.
*/

/* ARGSUSED */
static void
mkclock_sbus_attach(device_t parent, device_t self, void *aux)
{
       struct mk48txx_softc *sc = device_private(self);
       struct sbus_attach_args *sa = aux;
       int sz;

       sc->sc_dev = self;
       sc->sc_bst = sa->sa_bustag;

       /* use sa->sa_regs[0].size? */
       sz = 8192;

       if (sbus_bus_map(sc->sc_bst,
                        sa->sa_slot,
                        trunc_page(sa->sa_offset),
                        sz,
                        BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_READONLY,
                        &sc->sc_bsh) != 0) {
               aprint_error(": can't map register\n");
               return;
       }
       mkclock_attach(sc, sa->sa_node);
}


/* ARGSUSED */
static void
mkclock_ebus_attach(device_t parent, device_t self, void *aux)
{
       struct mk48txx_softc *sc = device_private(self);
       struct ebus_attach_args *ea = aux;
       int sz;

       sc->sc_dev = self;
       sc->sc_bst = ea->ea_bustag;

       /* hard code to 8K? */
       sz = ea->ea_reg[0].size;

       /* Use the PROM address if there. */
       if (ea->ea_nvaddr)
               sparc_promaddr_to_handle(sc->sc_bst, ea->ea_vaddr[0],
                       &sc->sc_bsh);
       else if (bus_space_map(sc->sc_bst,
                        EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
                        sz,
                        BUS_SPACE_MAP_LINEAR,
                        &sc->sc_bsh) != 0) {
               aprint_error(": can't map register\n");
               return;
       }
       mkclock_attach(sc, ea->ea_node);
}

/* ARGSUSED */
static void
mkclock_fhc_attach(device_t parent, device_t self, void *aux)
{
       struct mk48txx_softc *sc = device_private(self);
       struct fhc_attach_args *fa = aux;

       sc->sc_dev = self;
       sc->sc_bst = fa->fa_bustag;

       if (fhc_bus_map(sc->sc_bst,
                       fa->fa_reg[0].fbr_slot,
                       (fa->fa_reg[0].fbr_offset & ~NBPG),
                       fa->fa_reg[0].fbr_size,
                       BUS_SPACE_MAP_LINEAR,
                       &sc->sc_bsh) != 0) {
               aprint_error(": can't map register\n");
               return;
       }
       mkclock_attach(sc, fa->fa_node);
}


static void
mkclock_attach(struct mk48txx_softc *sc, int node)
{

       sc->sc_model = prom_getpropstring(node, "model");

#ifdef DIAGNOSTIC
       if (sc->sc_model == NULL)
               panic("clockattach: no model property");
#endif

       /* Our TOD clock year 0 is 1968 */
       sc->sc_year0 = 1968;

       /* Save info for the clock wenable call. */
       sc->sc_handle.todr_setwen = mkclock_wenable;

       mk48txx_attach(sc);

       aprint_normal("\n");
}

/*
* Write en/dis-able clock registers.  We coordinate so that several
* writers can run simultaneously.
*/
static int
mkclock_wenable(struct todr_chip_handle *handle, int onoff)
{
       struct mk48txx_softc *sc;
       vm_prot_t prot;
       vaddr_t va;
       int s, err = 0;
       static int writers;

       /* XXXSMP */
       s = splhigh();
       if (onoff)
               prot = writers++ == 0 ? VM_PROT_READ|VM_PROT_WRITE : 0;
       else
               prot = --writers == 0 ? VM_PROT_READ : 0;
       splx(s);
       if (prot == VM_PROT_NONE) {
               return 0;
       }
       sc = handle->cookie;
       va = (vaddr_t)bus_space_vaddr(sc->sc_bst, sc->sc_bsh);
       if (va == 0UL) {
               printf("clock_wenable: WARNING -- cannot get va\n");
               return EIO;
       }
       pmap_kprotect(va, prot);
       return (err);
}

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