1 /* $NetBSD: geodecntr.c,v 1.8 2008/05/10 13:35:56 jmcneill 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 1.8 2008/05/10 13:35:56 jmcneill 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 <machine/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