wdog.c revision 1.16
1 /* $NetBSD: wdog.c,v 1.16 2008/03/27 02:03:03 uwe Exp $ */ 2 3 /*- 4 * Copyright (C) 2000 SAITOH Masanobu. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: wdog.c,v 1.16 2008/03/27 02:03:03 uwe Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/buf.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/uio.h> 37 #include <sys/device.h> 38 #include <sys/fcntl.h> 39 #include <sys/ioctl.h> 40 #include <sys/malloc.h> 41 #include <sys/proc.h> 42 #include <sys/syslog.h> 43 #include <sys/conf.h> 44 45 #include <machine/cpu.h> 46 #include <machine/intr.h> 47 48 #include <sh3/frame.h> 49 #include <sh3/wdtreg.h> 50 #include <sh3/wdogvar.h> 51 #include <sh3/exception.h> 52 53 struct wdog_softc { 54 device_t sc_dev; 55 int flags; 56 }; 57 58 static int wdogmatch(device_t, cfdata_t, void *); 59 static void wdogattach(device_t, device_t, void *); 60 static int wdogintr(void *); 61 62 CFATTACH_DECL_NEW(wdog, sizeof(struct wdog_softc), 63 wdogmatch, wdogattach, NULL, NULL); 64 65 extern struct cfdriver wdog_cd; 66 67 dev_type_open(wdogopen); 68 dev_type_close(wdogclose); 69 dev_type_ioctl(wdogioctl); 70 71 const struct cdevsw wdog_cdevsw = { 72 wdogopen, wdogclose, noread, nowrite, wdogioctl, 73 nostop, notty, nopoll, nommap, nokqfilter, 74 }; 75 76 void 77 wdog_wr_cnt(unsigned char x) 78 { 79 80 SHREG_WTCNT_W = WTCNT_W_M | (unsigned short) x; 81 } 82 83 void 84 wdog_wr_csr(unsigned char x) 85 { 86 87 SHREG_WTCSR_W = WTCSR_W_M | (unsigned short) x; 88 } 89 90 static int 91 wdogmatch(device_t parent, cfdata_t cfp, void *aux) 92 { 93 94 if (strcmp(cfp->cf_name, "wdog")) 95 return (0); 96 97 return (1); 98 } 99 100 /* 101 * functions for probeing. 102 */ 103 /* ARGSUSED */ 104 static void 105 wdogattach(device_t parent, device_t self, void *aux) 106 { 107 struct wdog_softc *sc; 108 109 sc = device_private(self); 110 sc->sc_dev = self; 111 112 aprint_naive("\n"); 113 aprint_normal(": internal watchdog timer\n"); 114 115 wdog_wr_csr(WTCSR_WT | WTCSR_CKS_4096); /* default to wt mode */ 116 117 intc_intr_establish(SH_INTEVT_WDT_ITI, IST_LEVEL, IPL_SOFTCLOCK, 118 wdogintr, 0); 119 } 120 121 /*ARGSUSED*/ 122 int 123 wdogopen(dev_t dev, int flag, int mode, struct lwp *l) 124 { 125 struct wdog_softc *sc; 126 127 sc = device_lookup_private(&wdog_cd, minor(dev)); 128 if (sc == NULL) 129 return (ENXIO); 130 131 if (sc->flags & WDOGF_OPEN) 132 return (EBUSY); 133 sc->flags |= WDOGF_OPEN; 134 return (0); 135 } 136 137 /*ARGSUSED*/ 138 int 139 wdogclose(dev_t dev, int flag, int mode, struct lwp *l) 140 { 141 struct wdog_softc *sc; 142 143 sc = device_lookup_private(&wdog_cd, minor(dev)); 144 145 if (sc->flags & WDOGF_OPEN) 146 sc->flags = 0; 147 148 return (0); 149 } 150 151 extern unsigned int maxwdog; 152 153 /*ARGSUSED*/ 154 int 155 wdogioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 156 { 157 int error = 0; 158 int request; 159 160 switch (cmd) { 161 case SIOWDOGSETMODE: 162 request = *(int *)data; 163 164 switch (request) { 165 case WDOGM_RESET: 166 wdog_wr_csr(SHREG_WTCSR_R | WTCSR_WT); 167 break; 168 case WDOGM_INTR: 169 wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_WT); 170 break; 171 default: 172 error = EINVAL; 173 break; 174 } 175 break; 176 case SIORESETWDOG: 177 wdog_wr_cnt(0); /* reset to zero */ 178 break; 179 case SIOSTARTWDOG: 180 wdog_wr_csr(WTCSR_WT | WTCSR_CKS_4096); 181 wdog_wr_cnt(0); /* reset to zero */ 182 wdog_wr_csr(SHREG_WTCSR_R | WTCSR_TME); /* start!!! */ 183 break; 184 case SIOSTOPWDOG: 185 wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_TME); /* stop */ 186 break; 187 case SIOSETWDOG: 188 request = *(int *)data; 189 190 if (request > 2) { 191 error = EINVAL; 192 break; 193 } 194 break; 195 default: 196 error = EINVAL; 197 break; 198 } 199 200 return (error); 201 } 202 203 int 204 wdogintr(void *arg) 205 { 206 struct trapframe *frame = arg; 207 208 wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_IOVF); /* clear overflow bit */ 209 wdog_wr_cnt(0); /* reset to zero */ 210 printf("wdog trapped: spc = %x\n", frame->tf_spc); 211 212 return (0); 213 } 214
Indexes created Tue Sep 23 23:09:58 GMT 2025