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sbwdog.c revision 1.7 
      1 /* $NetBSD: sbwdog.c,v 1.7 2006/01/12 04:40:50 simonb Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2002 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc.
      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  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed for the NetBSD Project by
     20  *	Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * Watchdog timer support for the Broadcom BCM1250 processor.
     40  */
     41 
     42 #include <sys/cdefs.h>
     43 __KERNEL_RCSID(0, "$NetBSD: sbwdog.c,v 1.7 2006/01/12 04:40:50 simonb Exp $");
     44 
     45 #include <sys/param.h>
     46 #include <sys/systm.h>
     47 #include <sys/device.h>
     48 #include <sys/wdog.h>
     49 
     50 #include <dev/sysmon/sysmonvar.h>
     51 
     52 #include <machine/locore.h>
     53 
     54 #include <mips/sibyte/include/sb1250_regs.h>
     55 #include <mips/sibyte/include/sb1250_scd.h>
     56 #include <mips/sibyte/dev/sbscdvar.h>
     57 
     58 #define	SBWDOG_DEFAULT_PERIOD	5	/* Default to 5 seconds. */
     59 
     60 struct sbwdog_softc {
     61 	struct device sc_dev;
     62 	struct sysmon_wdog sc_smw;
     63 	u_long sc_addr;
     64 	int sc_wdog_armed;
     65 	int sc_wdog_period;
     66 };
     67 
     68 static int sbwdog_match(struct device *, struct cfdata *, void *);
     69 static void sbwdog_attach(struct device *, struct device *, void *);
     70 static int sbwdog_tickle(struct sysmon_wdog *);
     71 static int sbwdog_setmode(struct sysmon_wdog *);
     72 
     73 CFATTACH_DECL(sbwdog, sizeof(struct sbwdog_softc),
     74     sbwdog_match, sbwdog_attach, NULL, NULL);
     75 
     76 #define	READ_REG(rp)		(mips3_ld((uint64_t *)(rp)))
     77 #define	WRITE_REG(rp, val)	(mips3_sd((uint64_t *)(rp), (val)))
     78 
     79 static int
     80 sbwdog_match(struct device *parent, struct cfdata *cf, void *aux)
     81 {
     82 	struct sbscd_attach_args *sa = aux;
     83 
     84 	if (sa->sa_locs.sa_type != SBSCD_DEVTYPE_WDOG)
     85 		return (0);
     86 
     87 	return (1);
     88 }
     89 
     90 static void
     91 sbwdog_attach(struct device *parent, struct device *self, void *aux)
     92 {
     93 	struct sbwdog_softc *sc = (void *)self;
     94 	struct sbscd_attach_args *sa = aux;
     95 
     96 	sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD;
     97 	sc->sc_addr = MIPS_PHYS_TO_KSEG1(sa->sa_base + sa->sa_locs.sa_offset);
     98 
     99 	printf(": %d second period\n", sc->sc_wdog_period);
    100 
    101 	sc->sc_smw.smw_name = sc->sc_dev.dv_xname;
    102 	sc->sc_smw.smw_cookie = sc;
    103 	sc->sc_smw.smw_setmode = sbwdog_setmode;
    104 	sc->sc_smw.smw_tickle = sbwdog_tickle;
    105 	sc->sc_smw.smw_period = sc->sc_wdog_period;
    106 
    107 	if (sysmon_wdog_register(&sc->sc_smw) != 0)
    108 		printf("%s: unable to register with sysmon\n",
    109 		    sc->sc_dev.dv_xname);
    110 }
    111 
    112 static int
    113 sbwdog_tickle(struct sysmon_wdog *smw)
    114 {
    115 	struct sbwdog_softc *sc = smw->smw_cookie;
    116 
    117 	WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE);
    118 	return (0);
    119 }
    120 
    121 static int
    122 sbwdog_setmode(struct sysmon_wdog *smw)
    123 {
    124 	struct sbwdog_softc *sc = smw->smw_cookie;
    125 
    126 	if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
    127 		if (sc->sc_wdog_armed)
    128 			WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, 0);
    129 	} else {
    130 		if (smw->smw_period == WDOG_PERIOD_DEFAULT) {
    131 			sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD;
    132 			smw->smw_period = SBWDOG_DEFAULT_PERIOD;	/* XXX needed?? */
    133 		} else if (smw->smw_period > 8) {
    134 			/* Maximum of 2^23 usec watchdog period. */
    135 			return (EINVAL);
    136 		}
    137 		sc->sc_wdog_period = smw->smw_period;
    138 		sc->sc_wdog_armed = 1;
    139 		WRITE_REG(sc->sc_addr + R_SCD_WDOG_INIT,
    140 		    sc->sc_wdog_period * V_SCD_WDOG_FREQ);
    141 
    142 		/* Watchdog is armed by tickling it. */
    143 		sbwdog_tickle(smw);
    144 	}
    145 	return (0);
    146 }
    147