1 /* $NetBSD: pps_ppbus.c,v 1.16 2014/07/25 08:10:38 dholland Exp $ */ 2 3 /* 4 * ported to timecounters by Frank Kardel 2006 5 * 6 * Copyright (c) 2004 7 * Matthias Drochner. All rights reserved. 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: pps_ppbus.c,v 1.16 2014/07/25 08:10:38 dholland Exp $"); 33 34 #include "opt_ntp.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/conf.h> 39 #include <sys/proc.h> 40 #include <sys/ioctl.h> 41 #include <sys/timepps.h> 42 43 #include <dev/ppbus/ppbus_base.h> 44 #include <dev/ppbus/ppbus_device.h> 45 #include <dev/ppbus/ppbus_io.h> 46 #include <dev/ppbus/ppbus_var.h> 47 48 struct pps_softc { 49 struct ppbus_device_softc pps_dev; 50 device_t ppbus; 51 int busy; 52 struct pps_state pps_state; /* pps state */ 53 }; 54 55 static int pps_probe(device_t, cfdata_t, void *); 56 static void pps_attach(device_t, device_t, void *); 57 CFATTACH_DECL_NEW(pps, sizeof(struct pps_softc), pps_probe, pps_attach, 58 NULL, NULL); 59 extern struct cfdriver pps_cd; 60 61 static dev_type_open(ppsopen); 62 static dev_type_close(ppsclose); 63 static dev_type_ioctl(ppsioctl); 64 const struct cdevsw pps_cdevsw = { 65 .d_open = ppsopen, 66 .d_close = ppsclose, 67 .d_read = noread, 68 .d_write = nowrite, 69 .d_ioctl = ppsioctl, 70 .d_stop = nostop, 71 .d_tty = notty, 72 .d_poll = nopoll, 73 .d_mmap = nommap, 74 .d_kqfilter = nokqfilter, 75 .d_discard = nodiscard, 76 .d_flag = D_OTHER 77 }; 78 79 static void ppsintr(void *arg); 80 81 static int 82 pps_probe(device_t parent, cfdata_t match, void *aux) 83 { 84 struct ppbus_attach_args *args = aux; 85 86 /* we need an interrupt */ 87 if (!(args->capabilities & PPBUS_HAS_INTR)) 88 return 0; 89 90 return 1; 91 } 92 93 static void 94 pps_attach(device_t parent, device_t self, void *aux) 95 { 96 struct pps_softc *sc = device_private(self); 97 98 sc->ppbus = parent; 99 sc->pps_dev.sc_dev = self; 100 101 printf("\n"); 102 } 103 104 static int 105 ppsopen(dev_t dev, int flags, int fmt, struct lwp *l) 106 { 107 struct pps_softc *sc; 108 int res, weg = 0; 109 110 sc = device_lookup_private(&pps_cd, minor(dev)); 111 if (!sc) 112 return (ENXIO); 113 114 if (sc->busy) 115 return (0); 116 117 if (ppbus_request_bus(sc->ppbus, sc->pps_dev.sc_dev, 118 PPBUS_WAIT|PPBUS_INTR, 0)) 119 return (EINTR); 120 121 ppbus_write_ivar(sc->ppbus, PPBUS_IVAR_IEEE, &weg); 122 123 /* attach the interrupt handler */ 124 /* XXX priority should be set here */ 125 res = ppbus_add_handler(sc->ppbus, ppsintr, sc); 126 if (res) { 127 ppbus_release_bus(sc->ppbus, sc->pps_dev.sc_dev, 128 PPBUS_WAIT, 0); 129 return (res); 130 } 131 132 ppbus_set_mode(sc->ppbus, PPBUS_PS2, 0); 133 ppbus_wctr(sc->ppbus, IRQENABLE | PCD | nINIT | SELECTIN); 134 135 mutex_spin_enter(&timecounter_lock); 136 memset((void *)&sc->pps_state, 0, sizeof(sc->pps_state)); 137 sc->pps_state.ppscap = PPS_CAPTUREASSERT; 138 pps_init(&sc->pps_state); 139 mutex_spin_exit(&timecounter_lock); 140 141 sc->busy = 1; 142 143 return (0); 144 } 145 146 static int 147 ppsclose(dev_t dev, int flags, int fmt, struct lwp *l) 148 { 149 struct pps_softc *sc = device_lookup_private(&pps_cd, minor(dev)); 150 device_t ppbus = sc->ppbus; 151 152 sc->busy = 0; 153 mutex_spin_enter(&timecounter_lock); 154 sc->pps_state.ppsparam.mode = 0; 155 mutex_spin_exit(&timecounter_lock); 156 157 ppbus_wdtr(ppbus, 0); 158 ppbus_wctr(ppbus, 0); 159 160 ppbus_remove_handler(ppbus, ppsintr); 161 ppbus_set_mode(ppbus, PPBUS_COMPATIBLE, 0); 162 ppbus_release_bus(ppbus, sc->pps_dev.sc_dev, PPBUS_WAIT, 0); 163 return (0); 164 } 165 166 static void 167 ppsintr(void *arg) 168 { 169 struct pps_softc *sc = arg; 170 device_t ppbus = sc->ppbus; 171 172 mutex_spin_enter(&timecounter_lock); 173 pps_capture(&sc->pps_state); 174 if (!(ppbus_rstr(ppbus) & nACK)) { 175 mutex_spin_exit(&timecounter_lock); 176 return; 177 } 178 if (sc->pps_state.ppsparam.mode & PPS_ECHOASSERT) 179 ppbus_wctr(ppbus, IRQENABLE | AUTOFEED); 180 pps_event(&sc->pps_state, PPS_CAPTUREASSERT); 181 if (sc->pps_state.ppsparam.mode & PPS_ECHOASSERT) 182 ppbus_wctr(ppbus, IRQENABLE); 183 mutex_spin_exit(&timecounter_lock); 184 } 185 186 static int 187 ppsioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l) 188 { 189 struct pps_softc *sc = device_lookup_private(&pps_cd, minor(dev)); 190 int error = 0; 191 192 switch (cmd) { 193 case PPS_IOC_CREATE: 194 case PPS_IOC_DESTROY: 195 case PPS_IOC_GETPARAMS: 196 case PPS_IOC_SETPARAMS: 197 case PPS_IOC_GETCAP: 198 case PPS_IOC_FETCH: 199 #ifdef PPS_SYNC 200 case PPS_IOC_KCBIND: 201 #endif 202 mutex_spin_enter(&timecounter_lock); 203 error = pps_ioctl(cmd, data, &sc->pps_state); 204 mutex_spin_exit(&timecounter_lock); 205 break; 206 207 default: 208 error = EPASSTHROUGH; 209 break; 210 } 211 return (error); 212 } 213
Indexes created Sat Sep 20 22:09:52 GMT 2025