1 /* $NetBSD: sbwdog.c,v 1.8 2009/08/12 12:56:29 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 1.8 2009/08/12 12:56:29 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_locs.sa_addr); 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