1 /* $NetBSD: geodecntr.c,v 1.4 2006/11/16 01:32:39 christos 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 1.4 2006/11/16 01:32:39 christos 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, 64 void *aux) 65 { 66 return !attached; 67 } 68 69 /* 70 * attach time counter 71 */ 72 static void 73 geodecntr_attach(struct device *parent, struct device *self, void *aux) 74 { 75 struct geodecntr_softc *sc = (struct geodecntr_softc *) self; 76 77 aprint_normal(": AMD Geode SC1100 27Mhz Counter\n"); 78 79 sc->sc_gcb_dev = (struct geode_gcb_softc *)parent; 80 81 /* 82 * select 27MHz, no powerdown, no interrupt 83 */ 84 bus_space_write_1(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, 85 SC1100_GCB_TMCNFG_B, SC1100_TMCNFG_TMCLKSEL); 86 87 memset(&sc->sc_tc, 0, sizeof(sc->sc_tc)); 88 89 sc->sc_tc.tc_get_timecount = geode_get_timecount; 90 sc->sc_tc.tc_poll_pps = NULL; 91 sc->sc_tc.tc_counter_mask = 0xffffffff; 92 sc->sc_tc.tc_frequency = 27000000; 93 sc->sc_tc.tc_name = "geodecounter"; 94 sc->sc_tc.tc_priv = sc; 95 sc->sc_tc.tc_quality = 1000; 96 97 tc_init(&sc->sc_tc); 98 99 attached = 1; 100 } 101 102 /* 103 * read counter 104 */ 105 static unsigned geode_get_timecount(struct timecounter *tc) 106 { 107 struct geodecntr_softc *sc = (struct geodecntr_softc *)tc->tc_priv; 108 109 return bus_space_read_4(sc->sc_gcb_dev->sc_iot, sc->sc_gcb_dev->sc_ioh, SC1100_GCB_TMVALUE_L); 110 } 111 112 CFATTACH_DECL(geodecntr, sizeof(struct geodecntr_softc), 113 geodecntr_match, geodecntr_attach, NULL, NULL); 114 115