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wdog.c revision 1.4
      1  1.4  msaitoh /* $NetBSD: wdog.c,v 1.4 2000/10/31 02:04:12 msaitoh 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  1.1  msaitoh 
     41  1.1  msaitoh #include <machine/cpu.h>
     42  1.1  msaitoh #include <machine/conf.h>
     43  1.4  msaitoh #include <sh3/frame.h>
     44  1.1  msaitoh #include <sh3/shbvar.h>
     45  1.1  msaitoh #include <sh3/wdtreg.h>
     46  1.1  msaitoh #include <sh3/wdogvar.h>
     47  1.1  msaitoh 
     48  1.1  msaitoh struct wdog_softc {
     49  1.1  msaitoh 	struct device sc_dev;		/* generic device structures */
     50  1.1  msaitoh 	unsigned int iobase;
     51  1.1  msaitoh 	int flags;
     52  1.1  msaitoh };
     53  1.1  msaitoh 
     54  1.1  msaitoh static int wdogmatch __P((struct device *, struct cfdata *, void *));
     55  1.1  msaitoh static void wdogattach __P((struct device *, struct device *, void *));
     56  1.4  msaitoh static int wdogintr __P((void *));
     57  1.1  msaitoh 
     58  1.1  msaitoh struct cfattach wdog_ca = {
     59  1.1  msaitoh 	sizeof(struct wdog_softc), wdogmatch, wdogattach
     60  1.1  msaitoh };
     61  1.1  msaitoh 
     62  1.1  msaitoh extern struct cfdriver wdog_cd;
     63  1.1  msaitoh 
     64  1.1  msaitoh void
     65  1.1  msaitoh wdog_wr_cnt(x)
     66  1.1  msaitoh 	unsigned char x;
     67  1.1  msaitoh {
     68  1.1  msaitoh 
     69  1.1  msaitoh 	SHREG_WTCNT_W = WTCNT_W_M | (unsigned short) x;
     70  1.1  msaitoh }
     71  1.1  msaitoh 
     72  1.1  msaitoh void
     73  1.1  msaitoh wdog_wr_csr(x)
     74  1.1  msaitoh 	unsigned char x;
     75  1.1  msaitoh {
     76  1.1  msaitoh 
     77  1.1  msaitoh 	SHREG_WTCSR_W = WTCSR_W_M | (unsigned short) x;
     78  1.1  msaitoh }
     79  1.1  msaitoh 
     80  1.1  msaitoh static int
     81  1.1  msaitoh wdogmatch(parent, cfp, aux)
     82  1.1  msaitoh 	struct device *parent;
     83  1.1  msaitoh 	struct cfdata *cfp;
     84  1.1  msaitoh 	void *aux;
     85  1.1  msaitoh {
     86  1.1  msaitoh 	struct shb_attach_args *sa = aux;
     87  1.1  msaitoh 
     88  1.1  msaitoh 	if (strcmp(cfp->cf_driver->cd_name, "wdog"))
     89  1.1  msaitoh 		return 0;
     90  1.1  msaitoh 
     91  1.1  msaitoh 	sa->ia_iosize = 4;	/* XXX */
     92  1.1  msaitoh 
     93  1.1  msaitoh 	return (1);
     94  1.1  msaitoh }
     95  1.1  msaitoh 
     96  1.1  msaitoh /*
     97  1.1  msaitoh  *  functions for probeing.
     98  1.1  msaitoh  */
     99  1.1  msaitoh /* ARGSUSED */
    100  1.1  msaitoh static void
    101  1.1  msaitoh wdogattach(parent, self, aux)
    102  1.1  msaitoh 	struct device	*parent, *self;
    103  1.1  msaitoh 	void		*aux;
    104  1.1  msaitoh {
    105  1.1  msaitoh 	struct wdog_softc *sc = (struct wdog_softc *)self;
    106  1.1  msaitoh 	struct shb_attach_args *sa = aux;
    107  1.1  msaitoh 
    108  1.1  msaitoh 	sc->iobase = sa->ia_iobase;
    109  1.1  msaitoh 	sc->flags = 0;
    110  1.1  msaitoh 
    111  1.4  msaitoh 	wdog_wr_csr(WTCSR_WT | WTCSR_CKS_4096);	/* default to wt mode */
    112  1.4  msaitoh 
    113  1.4  msaitoh 	shb_intr_establish(WDOG_IRQ, IST_EDGE, IPL_SOFTCLOCK, wdogintr, 0);
    114  1.4  msaitoh 
    115  1.1  msaitoh 	printf("\nwdog0: internal watchdog timer\n");
    116  1.1  msaitoh }
    117  1.1  msaitoh 
    118  1.1  msaitoh /*ARGSUSED*/
    119  1.1  msaitoh int
    120  1.1  msaitoh wdogopen(dev, flag, mode, p)
    121  1.1  msaitoh 	dev_t dev;
    122  1.1  msaitoh 	int flag, mode;
    123  1.1  msaitoh 	struct proc *p;
    124  1.1  msaitoh {
    125  1.1  msaitoh 	struct wdog_softc *sc = wdog_cd.cd_devs[0]; /* XXX */
    126  1.1  msaitoh 
    127  1.1  msaitoh 	if (minor(dev) != 0)
    128  1.1  msaitoh 		return (ENXIO);
    129  1.1  msaitoh 	if (sc->flags & WDOGF_OPEN)
    130  1.1  msaitoh 		return (EBUSY);
    131  1.1  msaitoh 	sc->flags |= WDOGF_OPEN;
    132  1.1  msaitoh 	return (0);
    133  1.1  msaitoh }
    134  1.1  msaitoh 
    135  1.1  msaitoh /*ARGSUSED*/
    136  1.1  msaitoh int
    137  1.1  msaitoh wdogclose(dev, flag, mode, p)
    138  1.1  msaitoh 	dev_t dev;
    139  1.1  msaitoh 	int flag, mode;
    140  1.1  msaitoh 	struct proc *p;
    141  1.1  msaitoh {
    142  1.1  msaitoh 	struct wdog_softc *sc = wdog_cd.cd_devs[0]; /* XXX */
    143  1.1  msaitoh 
    144  1.1  msaitoh 	if (sc->flags & WDOGF_OPEN)
    145  1.1  msaitoh 		sc->flags = 0;
    146  1.1  msaitoh 
    147  1.1  msaitoh 	return (0);
    148  1.1  msaitoh }
    149  1.1  msaitoh 
    150  1.1  msaitoh extern unsigned int maxwdog;
    151  1.1  msaitoh 
    152  1.1  msaitoh /*ARGSUSED*/
    153  1.1  msaitoh int
    154  1.1  msaitoh wdogioctl (dev, cmd, data, flag, p)
    155  1.1  msaitoh 	dev_t dev;
    156  1.1  msaitoh 	u_long cmd;
    157  1.1  msaitoh 	caddr_t data;
    158  1.1  msaitoh 	int flag;
    159  1.1  msaitoh 	struct proc *p;
    160  1.1  msaitoh {
    161  1.1  msaitoh 	int error = 0;
    162  1.1  msaitoh 	int request;
    163  1.1  msaitoh 
    164  1.1  msaitoh 	switch (cmd) {
    165  1.4  msaitoh 	case SIOWDOGSETMODE:
    166  1.4  msaitoh 		request = *(int *)data;
    167  1.4  msaitoh 
    168  1.4  msaitoh 		switch (request) {
    169  1.4  msaitoh 		case WDOGM_RESET:
    170  1.4  msaitoh 			wdog_wr_csr(SHREG_WTCSR_R | WTCSR_WT);
    171  1.4  msaitoh 			break;
    172  1.4  msaitoh 		case WDOGM_INTR:
    173  1.4  msaitoh 			wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_WT);
    174  1.4  msaitoh 			break;
    175  1.4  msaitoh 		default:
    176  1.4  msaitoh 			error = EINVAL;
    177  1.4  msaitoh 			break;
    178  1.4  msaitoh 		}
    179  1.4  msaitoh 		break;
    180  1.1  msaitoh 	case SIORESETWDOG:
    181  1.1  msaitoh 		wdog_wr_cnt(0);		/* reset to zero */
    182  1.1  msaitoh 		break;
    183  1.1  msaitoh 	case SIOSTARTWDOG:
    184  1.1  msaitoh 		wdog_wr_csr(WTCSR_WT | WTCSR_CKS_4096);
    185  1.1  msaitoh 		wdog_wr_cnt(0);		/* reset to zero */
    186  1.1  msaitoh 		wdog_wr_csr(SHREG_WTCSR_R | WTCSR_TME);	/* start!!! */
    187  1.1  msaitoh 		break;
    188  1.1  msaitoh 	case SIOSTOPWDOG:
    189  1.1  msaitoh 		wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_TME); /* stop */
    190  1.1  msaitoh 		break;
    191  1.1  msaitoh 	case SIOSETWDOG:
    192  1.1  msaitoh 		request = *(int *)data;
    193  1.1  msaitoh 
    194  1.1  msaitoh 		if (request > 2) {
    195  1.1  msaitoh 			error = EINVAL;
    196  1.1  msaitoh 			break;
    197  1.1  msaitoh 		}
    198  1.1  msaitoh 		break;
    199  1.1  msaitoh 	default:
    200  1.1  msaitoh 		error = EINVAL;
    201  1.1  msaitoh 		break;
    202  1.1  msaitoh 	}
    203  1.1  msaitoh 
    204  1.1  msaitoh 	return (error);
    205  1.4  msaitoh }
    206  1.4  msaitoh 
    207  1.4  msaitoh int
    208  1.4  msaitoh wdogintr(arg)
    209  1.4  msaitoh 	void *arg;
    210  1.4  msaitoh {
    211  1.4  msaitoh 	struct trapframe *frame = arg;
    212  1.4  msaitoh 
    213  1.4  msaitoh 	wdog_wr_csr(SHREG_WTCSR_R & ~WTCSR_IOVF); /* clear overflow bit */
    214  1.4  msaitoh 	wdog_wr_cnt(0);			/* reset to zero */
    215  1.4  msaitoh 	printf("wdog trapped: spc = %x\n", frame->tf_spc);
    216  1.4  msaitoh 
    217  1.4  msaitoh 	return (0);
    218  1.1  msaitoh }
    219