sys/arch/prep/pnpbus/mkclock_pnpbus.c

   1 /* $NetBSD: mkclock_pnpbus.c,v 1.4 2008/03/29 06:16:54 tsutsui Exp $ */
   2 /*-
   3  * Copyright (c) 2006 The NetBSD Foundation, Inc.
   4  * All rights reserved.
   5  *
   6  * This code is derived from software contributed to The NetBSD Foundation
   7  * by Tim Rightnour
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 /*
  32  * Mostek MK48T18 time-of-day chip attachment to pnpbus, using two
  33  * 8-bit ports for address selection and one 8-bit port for data.
  34  *
  35  * Note that this is essentially a stub driver. We cannot attach the clock
  36  * with this driver because the clock and nvram part are one in the same, and
  37  * share the same IO ports.  If we attach the clock, the NVRAM driver will
  38  * fail to attach.  Instead, we note that we have an mk48txx device, and in
  39  * the nvram driver, we will attach the clock goop there.
  40  *
  41  * Therefore the probe will always fail.
  42  */
  43
  44 #include <sys/cdefs.h>
  45 __KERNEL_RCSID(0, "$NetBSD: mkclock_pnpbus.c,v 1.4 2008/03/29 06:16:54 tsutsui Exp $");
  46
  47 #include <sys/param.h>
  48 #include <sys/kernel.h>
  49 #include <sys/systm.h>
  50 #include <sys/device.h>
  51
  52 #include <machine/bus.h>
  53 #include <machine/residual.h>
  54 #include <machine/chpidpnp.h>
  55
  56 #include <dev/isa/isavar.h>
  57 #include <prep/pnpbus/pnpbusvar.h>
  58
  59 extern int prep_clock_mk48txx;
  60
  61 static int      mkclock_pnpbus_probe(device_t, cfdata_t, void *);
  62
  63 CFATTACH_DECL_NEW(mkclock_pnpbus, 0, mkclock_pnpbus_probe, NULL, NULL, NULL);
  64
  65 static int
  66 mkclock_pnpbus_probe(device_t parent, cfdata_t cf, void *aux)
  67 {
  68         struct pnpbus_dev_attach_args *pna = aux;
  69
  70         if (strcmp(pna->pna_devid, "PNP0B00") == 0 &&
  71             pna->subtype == RealTimeClock && pna->chipid == MOTmk48)
  72                 prep_clock_mk48txx = 1;
  73
  74         return 0;
  75 }