1 /* $NetBSD: sbwdog.c,v 1.4 2002/10/02 15:52:26 thorpej 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/param.h> 43 #include <sys/systm.h> 44 #include <sys/device.h> 45 #include <sys/wdog.h> 46 47 #include <dev/sysmon/sysmonvar.h> 48 49 #include <machine/locore.h> 50 51 #include <mips/sibyte/include/sb1250_regs.h> 52 #include <mips/sibyte/include/sb1250_scd.h> 53 #include <mips/sibyte/dev/sbscdvar.h> 54 55 #define SBWDOG_DEFAULT_PERIOD 5 /* Default to 5 seconds. */ 56 57 struct sbwdog_softc { 58 struct device sc_dev; 59 struct sysmon_wdog sc_smw; 60 u_long sc_addr; 61 int sc_wdog_armed; 62 int sc_wdog_period; 63 }; 64 65 static int sbwdog_match(struct device *, struct cfdata *, void *); 66 static void sbwdog_attach(struct device *, struct device *, void *); 67 static int sbwdog_tickle(struct sysmon_wdog *); 68 static int sbwdog_setmode(struct sysmon_wdog *); 69 70 CFATTACH_DECL(sbwdog, sizeof(struct sbwdog_softc), 71 sbwdog_match, sbwdog_attach, NULL, NULL); 72 73 #define READ_REG(rp) (mips3_ld((uint64_t *)(rp))) 74 #define WRITE_REG(rp, val) (mips3_sd((uint64_t *)(rp), (val))) 75 76 static int 77 sbwdog_match(struct device *parent, struct cfdata *cf, void *aux) 78 { 79 struct sbscd_attach_args *sa = aux; 80 81 if (sa->sa_locs.sa_type != SBSCD_DEVTYPE_WDOG) 82 return (0); 83 84 return (1); 85 } 86 87 static void 88 sbwdog_attach(struct device *parent, struct device *self, void *aux) 89 { 90 struct sbwdog_softc *sc = (void *)self; 91 struct sbscd_attach_args *sa = aux; 92 93 sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD; 94 sc->sc_addr = MIPS_PHYS_TO_KSEG1(sa->sa_base + sa->sa_locs.sa_offset); 95 96 printf(": %d second period\n", sc->sc_wdog_period); 97 98 sc->sc_smw.smw_name = sc->sc_dev.dv_xname; 99 sc->sc_smw.smw_cookie = sc; 100 sc->sc_smw.smw_setmode = sbwdog_setmode; 101 sc->sc_smw.smw_tickle = sbwdog_tickle; 102 sc->sc_smw.smw_period = sc->sc_wdog_period; 103 104 if (sysmon_wdog_register(&sc->sc_smw) != 0) 105 printf("%s: unable to register with sysmon\n", 106 sc->sc_dev.dv_xname); 107 } 108 109 static int 110 sbwdog_tickle(struct sysmon_wdog *smw) 111 { 112 struct sbwdog_softc *sc = smw->smw_cookie; 113 114 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE); 115 return (0); 116 } 117 118 static int 119 sbwdog_setmode(struct sysmon_wdog *smw) 120 { 121 struct sbwdog_softc *sc = smw->smw_cookie; 122 123 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 124 if (sc->sc_wdog_armed) 125 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, 0); 126 } else { 127 if (smw->smw_period == WDOG_PERIOD_DEFAULT) { 128 sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD; 129 smw->smw_period = SBWDOG_DEFAULT_PERIOD; /* XXX needed?? */ 130 } else if (smw->smw_period > 8) { 131 /* Maximum of 2^23 usec watchdog period. */ 132 return (EOPNOTSUPP); 133 } 134 sc->sc_wdog_period = smw->smw_period; 135 sc->sc_wdog_armed = 1; 136 WRITE_REG(sc->sc_addr + R_SCD_WDOG_INIT, 137 sc->sc_wdog_period * V_SCD_WDOG_FREQ); 138 139 /* Watchdog is armed by tickling it. */ 140 sbwdog_tickle(smw); 141 } 142 return (0); 143 } 144