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wdog.c revision 1.8
      1  1.8  thorpej /* $NetBSD: wdog.c,v 1.8 2002/09/27 02:24:23 thorpej Exp $ */
      2  1.2  msaitoh 
      3  1.2  msaitoh /*-
      4  1.2  msaitoh  * Copyright (C) 2000 SAITOH Masanobu.  All rights reserved.
      5  1.2  msaitoh  *
      6  1.2  msaitoh  * Redistribution and use in source and binary forms, with or without
      7  1.2  msaitoh  * modification, are permitted provided that the following conditions
      8  1.2  msaitoh  * are met:
      9  1.2  msaitoh  * 1. Redistributions of source code must retain the above copyright
     10  1.2  msaitoh  *    notice, this list of conditions and the following disclaimer.
     11  1.2  msaitoh  * 2. Redistributions in binary form must reproduce the above copyright
     12  1.2  msaitoh  *    notice, this list of conditions and the following disclaimer in the
     13  1.2  msaitoh  *    documentation and/or other materials provided with the distribution.
     14  1.2  msaitoh  * 3. The name of the author may not be used to endorse or promote products
     15  1.2  msaitoh  *    derived from this software without specific prior written permission.
     16  1.2  msaitoh  *
     17  1.2  msaitoh  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  1.2  msaitoh  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  1.2  msaitoh  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  1.2  msaitoh  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  1.2  msaitoh  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  1.2  msaitoh  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  1.2  msaitoh  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  1.2  msaitoh  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  1.2  msaitoh  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26  1.2  msaitoh  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  1.2  msaitoh  */
     28  1.2  msaitoh 
     29  1.1  msaitoh #include <sys/param.h>
     30  1.1  msaitoh #include <sys/buf.h>
     31  1.1  msaitoh #include <sys/systm.h>
     32  1.1  msaitoh #include <sys/kernel.h>
     33  1.1  msaitoh #include <sys/uio.h>
     34  1.1  msaitoh #include <sys/device.h>
     35  1.1  msaitoh #include <sys/fcntl.h>
     36  1.1  msaitoh #include <sys/ioctl.h>
     37  1.1  msaitoh #include <sys/malloc.h>
     38  1.1  msaitoh #include <sys/proc.h>
     39  1.1  msaitoh #include <sys/syslog.h>
     40  1.7  gehenna #include <sys/conf.h>
     41  1.1  msaitoh 
     42  1.1  msaitoh #include <machine/cpu.h>
     43  1.6      uch #include <machine/intr.h>
     44  1.6      uch 
     45  1.4  msaitoh #include <sh3/frame.h>
     46  1.1  msaitoh #include <sh3/wdtreg.h>
     47  1.1  msaitoh #include <sh3/wdogvar.h>
     48  1.6      uch #include <sh3/exception.h>
     49  1.1  msaitoh 
     50  1.1  msaitoh struct wdog_softc {
     51  1.1  msaitoh 	struct device sc_dev;		/* generic device structures */
     52  1.1  msaitoh 	int flags;
     53  1.1  msaitoh };
     54  1.1  msaitoh 
     55  1.5      uch static int wdogmatch(struct device *, struct cfdata *, void *);
     56  1.5      uch static void wdogattach(struct device *, struct device *, void *);
     57  1.5      uch static int wdogintr(void *);
     58  1.1  msaitoh 
     59  1.1  msaitoh struct cfattach wdog_ca = {
     60  1.1  msaitoh 	sizeof(struct wdog_softc), wdogmatch, wdogattach
     61  1.1  msaitoh };
     62  1.1  msaitoh 
     63  1.1  msaitoh extern struct cfdriver wdog_cd;
     64  1.7  gehenna 
     65  1.7  gehenna dev_type_open(wdogopen);
     66  1.7  gehenna dev_type_close(wdogclose);
     67  1.7  gehenna dev_type_ioctl(wdogioctl);
     68  1.7  gehenna 
     69  1.7  gehenna const struct cdevsw wdog_cdevsw = {
     70  1.7  gehenna 	wdogopen, wdogclose, noread, nowrite, wdogioctl,
     71  1.7  gehenna 	nostop, notty, nopoll, nommap,
     72  1.7  gehenna };
     73  1.1  msaitoh 
     74  1.1  msaitoh void
     75  1.5      uch wdog_wr_cnt(unsigned char x)
     76  1.1  msaitoh {
     77  1.1  msaitoh 
     78  1.1  msaitoh 	SHREG_WTCNT_W = WTCNT_W_M | (unsigned short) x;
     79  1.1  msaitoh }
     80  1.1  msaitoh 
     81  1.1  msaitoh void
     82  1.5      uch wdog_wr_csr(unsigned char x)
     83  1.1  msaitoh {
     84  1.1  msaitoh 
     85  1.1  msaitoh 	SHREG_WTCSR_W = WTCSR_W_M | (unsigned short) x;
     86  1.1  msaitoh }
     87  1.1  msaitoh 
     88  1.1  msaitoh static int
     89  1.5      uch wdogmatch(struct device *parent, struct cfdata *cfp, void *aux)
     90  1.1  msaitoh {
     91  1.1  msaitoh 
     92  1.8  thorpej 	if (strcmp(cfp->cf_name, "wdog"))
     93  1.6      uch 		return (0);
     94  1.1  msaitoh 
     95  1.1  msaitoh 	return (1);
     96  1.1  msaitoh }
     97  1.1  msaitoh 
     98  1.1  msaitoh /*
     99  1.1  msaitoh  *  functions for probeing.
    100  1.1  msaitoh  */
    101  1.1  msaitoh /* ARGSUSED */
    102  1.1  msaitoh static void
    103  1.5      uch wdogattach(struct device *parent, struct device *self, void *aux)
    104  1.1  msaitoh {
    105  1.1  msaitoh 	struct wdog_softc *sc = (struct wdog_softc *)self;
    106  1.1  msaitoh 
    107  1.1  msaitoh 	sc->flags = 0;
    108  1.1  msaitoh 
    109  1.4  msaitoh 	wdog_wr_csr(WTCSR_WT | WTCSR_CKS_4096);	/* default to wt mode */
    110  1.4  msaitoh 
    111  1.6      uch 	intc_intr_establish(SH_INTEVT_WDT_ITI, IST_LEVEL, IPL_SOFTCLOCK,
    112  1.6      uch 	    wdogintr, 0);
    113  1.4  msaitoh 
    114  1.1  msaitoh 	printf("\nwdog0: internal watchdog timer\n");
    115  1.1  msaitoh }
    116  1.1  msaitoh 
    117  1.1  msaitoh /*ARGSUSED*/
    118  1.1  msaitoh int
    119  1.5      uch wdogopen(dev_t dev, int flag, int mode, struct proc *p)
    120  1.1  msaitoh {
    121  1.1  msaitoh 	struct wdog_softc *sc = wdog_cd.cd_devs[0]; /* XXX */
    122  1.1  msaitoh 
    123  1.1  msaitoh 	if (minor(dev) != 0)
    124  1.1  msaitoh 		return (ENXIO);
    125  1.1  msaitoh 	if (sc->flags & WDOGF_OPEN)
    126  1.1  msaitoh 		return (EBUSY);
    127  1.1  msaitoh 	sc->flags |= WDOGF_OPEN;
    128  1.1  msaitoh 	return (0);
    129  1.1  msaitoh }
    130  1.1  msaitoh 
    131  1.1  msaitoh /*ARGSUSED*/
    132  1.1  msaitoh int
    133  1.5      uch wdogclose(dev_t dev, int flag, int mode, struct proc *p)
    134  1.1  msaitoh {
    135  1.1  msaitoh 	struct wdog_softc *sc = wdog_cd.cd_devs[0]; /* XXX */
    136  1.1  msaitoh 
    137  1.1  msaitoh 	if (sc->flags & WDOGF_OPEN)
    138  1.1  msaitoh 		sc->flags = 0;
    139  1.1  msaitoh 
    140  1.1  msaitoh 	return (0);
    141  1.1  msaitoh }
    142  1.1  msaitoh 
    143  1.1  msaitoh extern unsigned int maxwdog;
    144  1.1  msaitoh 
    145  1.1  msaitoh /*ARGSUSED*/
    146  1.1  msaitoh int
    147  1.5      uch wdogioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
    148  1.1  msaitoh {
    149  1.1  msaitoh 	int error = 0;
    150  1.1  msaitoh 	int request;
    151  1.1  msaitoh 
    152  1.1  msaitoh 	switch (cmd) {
    153  1.4  msaitoh 	case SIOWDOGSETMODE:
    154  1.4  msaitoh 		request = *(int *)data;
    155  1.4  msaitoh 
    156  1.4  msaitoh 		switch (request) {
    157  1.4  msaitoh 		case WDOGM_RESET:
    158  1.4  msaitoh 			wdog_wr_csr(SHREG_WTCSR_R | WTCSR_WT);
    159  1.4  msaitoh 			break;
    160  1.4  msaitoh 		case WDOGM_INTR:
    161  1.4  msaitoh 			wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_WT);
    162  1.4  msaitoh 			break;
    163  1.4  msaitoh 		default:
    164  1.4  msaitoh 			error = EINVAL;
    165  1.4  msaitoh 			break;
    166  1.4  msaitoh 		}
    167  1.4  msaitoh 		break;
    168  1.1  msaitoh 	case SIORESETWDOG:
    169  1.1  msaitoh 		wdog_wr_cnt(0);		/* reset to zero */
    170  1.1  msaitoh 		break;
    171  1.1  msaitoh 	case SIOSTARTWDOG:
    172  1.1  msaitoh 		wdog_wr_csr(WTCSR_WT | WTCSR_CKS_4096);
    173  1.1  msaitoh 		wdog_wr_cnt(0);		/* reset to zero */
    174  1.1  msaitoh 		wdog_wr_csr(SHREG_WTCSR_R | WTCSR_TME);	/* start!!! */
    175  1.1  msaitoh 		break;
    176  1.1  msaitoh 	case SIOSTOPWDOG:
    177  1.1  msaitoh 		wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_TME); /* stop */
    178  1.1  msaitoh 		break;
    179  1.1  msaitoh 	case SIOSETWDOG:
    180  1.1  msaitoh 		request = *(int *)data;
    181  1.1  msaitoh 
    182  1.1  msaitoh 		if (request > 2) {
    183  1.1  msaitoh 			error = EINVAL;
    184  1.1  msaitoh 			break;
    185  1.1  msaitoh 		}
    186  1.1  msaitoh 		break;
    187  1.1  msaitoh 	default:
    188  1.1  msaitoh 		error = EINVAL;
    189  1.1  msaitoh 		break;
    190  1.1  msaitoh 	}
    191  1.1  msaitoh 
    192  1.1  msaitoh 	return (error);
    193  1.4  msaitoh }
    194  1.4  msaitoh 
    195  1.4  msaitoh int
    196  1.5      uch wdogintr(void *arg)
    197  1.4  msaitoh {
    198  1.4  msaitoh 	struct trapframe *frame = arg;
    199  1.4  msaitoh 
    200  1.4  msaitoh 	wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_IOVF); /* clear overflow bit */
    201  1.4  msaitoh 	wdog_wr_cnt(0);			/* reset to zero */
    202  1.4  msaitoh 	printf("wdog trapped: spc = %x\n", frame->tf_spc);
    203  1.4  msaitoh 
    204  1.4  msaitoh 	return (0);
    205  1.1  msaitoh }
    206