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      1 /*	$NetBSD: geodecntr.c,v 1.9 2011/07/01 17:37:26 dyoung 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: geodecntr.c,v 1.9 2011/07/01 17:37:26 dyoung Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/kernel.h>
     38 #include <sys/device.h>
     39 #include <machine/cpu.h>
     40 #include <sys/timetc.h>
     41 #include <sys/bus.h>
     42 #include <arch/i386/pci/geodevar.h>
     43 #include <arch/i386/pci/geodereg.h>
     44 
     45 struct  geodecntr_softc {
     46 	struct geode_gcb_softc *sc_gcb_dev;
     47 	struct timecounter      sc_tc;
     48 };
     49 
     50 static unsigned geode_get_timecount(struct timecounter *);
     51 
     52 static int attached = 0;
     53 
     54 static int
     55 geodecntr_match(device_t parent, cfdata_t match, void *aux)
     56 {
     57 	return !attached;
     58 }
     59 
     60 /*
     61  * attach time counter
     62  */
     63 static void
     64 geodecntr_attach(device_t parent, device_t self, void *aux)
     65 {
     66 	struct geodecntr_softc *sc = device_private(self);
     67 
     68 	aprint_naive("\n");
     69 	aprint_normal(": AMD Geode SC1100 27MHz Counter\n");
     70 
     71 	sc->sc_gcb_dev = device_private(parent);
     72 
     73 	/*
     74 	 * select 27MHz, no powerdown, no interrupt
     75 	 */
     76 	bus_space_write_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
     77 			  SC1100_GCB_TMCNFG_B, SC1100_TMCNFG_TMCLKSEL);
     78 
     79 	memset(&sc->sc_tc, 0, sizeof(sc->sc_tc));
     80 
     81 	sc->sc_tc.tc_get_timecount = geode_get_timecount;
     82 	sc->sc_tc.tc_poll_pps      = NULL;
     83 	sc->sc_tc.tc_counter_mask  = 0xffffffff;
     84 	sc->sc_tc.tc_frequency     = 27000000;
     85 	sc->sc_tc.tc_name          = "geodecounter";
     86 	sc->sc_tc.tc_priv          = sc;
     87 	sc->sc_tc.tc_quality       = 1000;
     88 
     89 	tc_init(&sc->sc_tc);
     90 
     91 	attached = 1;
     92 }
     93 
     94 static int
     95 geodecntr_detach(device_t self, int flags)
     96 {
     97 	struct geodecntr_softc *sc = device_private(self);
     98 
     99 	attached = 0;
    100 	return tc_detach(&sc->sc_tc);
    101 }
    102 
    103 /*
    104  * read counter
    105  */
    106 static unsigned geode_get_timecount(struct timecounter *tc)
    107 {
    108 	struct geodecntr_softc *sc = (struct geodecntr_softc *)tc->tc_priv;
    109 
    110 	return bus_space_read_4(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh,
    111 	    SC1100_GCB_TMVALUE_L);
    112 }
    113 
    114 CFATTACH_DECL_NEW(geodecntr, sizeof(struct geodecntr_softc),
    115 	      geodecntr_match, geodecntr_attach, geodecntr_detach, NULL);
    116 
    117