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geodecntr.c revision 1.2.6.2 
      1 /*	$NetBSD: geodecntr.c,v 1.2.6.2 2006/06/21 14:52:30 yamt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Frank Kardel inspired from the patches to FreeBSD by Poul Henning Kamp
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the NetBSD
     21  *	Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <sys/cdefs.h>
     40 __KERNEL_RCSID(0, "$NetBSD: geodecntr.c,v 1.2.6.2 2006/06/21 14:52:30 yamt Exp $");
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/kernel.h>
     45 #include <sys/device.h>
     46 #include <machine/cpu.h>
     47 #include <sys/timetc.h>
     48 #include <machine/bus.h>
     49 #include <arch/i386/pci/geodevar.h>
     50 #include <arch/i386/pci/geodereg.h>
     51 
     52 struct  geodecntr_softc {
     53 	struct device           sc_dev;
     54 	struct geode_gcb_softc *sc_gcb_dev;
     55 	struct timecounter      sc_tc;
     56 };
     57 
     58 static unsigned geode_get_timecount(struct timecounter *);
     59 
     60 static int attached = 0;
     61 
     62 static int
     63 geodecntr_match(struct device *parent, struct cfdata *match, void *aux)
     64 {
     65 	return !attached;
     66 }
     67 
     68 /*
     69  * attach time counter
     70  */
     71 static void
     72 geodecntr_attach(struct device *parent, struct device *self, void *aux)
     73 {
     74 	struct geodecntr_softc *sc = (struct geodecntr_softc *) self;
     75 
     76 	aprint_normal(": AMD Geode SC1100 27Mhz Counter\n");
     77 
     78 	sc->sc_gcb_dev = (struct geode_gcb_softc *)parent;
     79 
     80 	/*
     81 	 * select 27MHz, no powerdown, no interrupt
     82 	 */
     83 	bus_space_write_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
     84 			  SC1100_GCB_TMCNFG_B, SC1100_TMCNFG_TMCLKSEL);
     85 
     86 	memset(&sc->sc_tc, 0, sizeof(sc->sc_tc));
     87 
     88 	sc->sc_tc.tc_get_timecount = geode_get_timecount;
     89 	sc->sc_tc.tc_poll_pps      = NULL;
     90 	sc->sc_tc.tc_counter_mask  = 0xffffffff;
     91 	sc->sc_tc.tc_frequency     = 27000000;
     92 	sc->sc_tc.tc_name          = "geodecounter";
     93 	sc->sc_tc.tc_priv          = sc;
     94 	sc->sc_tc.tc_quality       = 1000;
     95 
     96 	tc_init(&sc->sc_tc);
     97 
     98 	attached = 1;
     99 }
    100 
    101 /*
    102  * read counter
    103  */
    104 static unsigned geode_get_timecount(struct timecounter *tc)
    105 {
    106 	struct geodecntr_softc *sc = (struct geodecntr_softc *)tc->tc_priv;
    107 
    108 	return bus_space_read_4(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_TMVALUE_L);
    109 }
    110 
    111 CFATTACH_DECL(geodecntr, sizeof(struct geodecntr_softc),
    112 	      geodecntr_match, geodecntr_attach, NULL, NULL);
    113 
    114