Home | History | Annotate | Line # | Download | only in pnpbus 
      1 /* $NetBSD: mkclock_pnpbus.c,v 1.6 2011/07/01 16:55:42 dyoung 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 1.6 2011/07/01 16:55:42 dyoung 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 <sys/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 }
     76