sbwdog.c revision 1.13
1 /* $NetBSD: sbwdog.c,v 1.13 2011/07/10 23:32:03 matt 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 1.13 2011/07/10 23:32:03 matt Exp $"); 44 45 #include "locators.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/device.h> 50 #include <sys/wdog.h> 51 52 #include <dev/sysmon/sysmonvar.h> 53 54 #include <mips/locore.h> 55 56 #include <mips/sibyte/include/sb1250_regs.h> 57 #include <mips/sibyte/include/sb1250_scd.h> 58 #include <mips/sibyte/dev/sbscdvar.h> 59 60 #define SBWDOG_DEFAULT_PERIOD 5 /* Default to 5 seconds. */ 61 62 struct sbwdog_softc { 63 device_t sc_dev; 64 struct sysmon_wdog sc_smw; 65 u_long sc_addr; 66 int sc_wdog_armed; 67 int sc_wdog_period; 68 }; 69 70 static int sbwdog_match(device_t, cfdata_t, void *); 71 static void sbwdog_attach(device_t, device_t, void *); 72 static int sbwdog_tickle(struct sysmon_wdog *); 73 static int sbwdog_setmode(struct sysmon_wdog *); 74 static void sbwdog_intr(void *, uint32_t, vaddr_t); 75 76 CFATTACH_DECL_NEW(sbwdog, sizeof(struct sbwdog_softc), 77 sbwdog_match, sbwdog_attach, NULL, NULL); 78 79 #define READ_REG(rp) (mips3_ld((volatile uint64_t *)(rp))) 80 #define WRITE_REG(rp, val) (mips3_sd((volatile uint64_t *)(rp), (val))) 81 82 static int 83 sbwdog_match(device_t parent, cfdata_t cf, void *aux) 84 { 85 struct sbscd_attach_args *sa = aux; 86 87 if (sa->sa_locs.sa_type != SBSCD_DEVTYPE_WDOG) 88 return (0); 89 90 return (1); 91 } 92 93 static void 94 sbwdog_attach(device_t parent, device_t self, void *aux) 95 { 96 struct sbwdog_softc *sc = device_private(self); 97 struct sbscd_attach_args *sa = aux; 98 99 sc->sc_dev = self; 100 sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD; 101 sc->sc_addr = MIPS_PHYS_TO_KSEG1(sa->sa_base + sa->sa_locs.sa_offset); 102 103 aprint_normal(": %d second period\n", sc->sc_wdog_period); 104 105 sc->sc_smw.smw_name = device_xname(sc->sc_dev); 106 sc->sc_smw.smw_cookie = sc; 107 sc->sc_smw.smw_setmode = sbwdog_setmode; 108 sc->sc_smw.smw_tickle = sbwdog_tickle; 109 sc->sc_smw.smw_period = sc->sc_wdog_period; 110 111 if (sysmon_wdog_register(&sc->sc_smw) != 0) 112 aprint_error_dev(self, "unable to register with sysmon\n"); 113 114 if (sa->sa_locs.sa_intr[0] != SBOBIOCF_INTR_DEFAULT) 115 cpu_intr_establish(sa->sa_locs.sa_intr[0], IPL_HIGH, 116 sbwdog_intr, sc); 117 } 118 119 static int 120 sbwdog_tickle(struct sysmon_wdog *smw) 121 { 122 struct sbwdog_softc *sc = smw->smw_cookie; 123 124 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE); 125 return (0); 126 } 127 128 static void 129 sbwdog_intr(void *v, uint32_t cause, vaddr_t pc) 130 { 131 struct sbwdog_softc *sc = v; 132 133 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE); 134 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, 0); 135 WRITE_REG(sc->sc_addr + R_SCD_WDOG_INIT, 136 sc->sc_wdog_period * V_SCD_WDOG_FREQ); 137 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, M_SCD_WDOG_ENABLE); 138 } 139 140 141 static int 142 sbwdog_setmode(struct sysmon_wdog *smw) 143 { 144 struct sbwdog_softc *sc = smw->smw_cookie; 145 146 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 147 if (sc->sc_wdog_armed) 148 WRITE_REG(sc->sc_addr + R_SCD_WDOG_CFG, 0); 149 } else { 150 if (smw->smw_period == WDOG_PERIOD_DEFAULT) { 151 sc->sc_wdog_period = SBWDOG_DEFAULT_PERIOD; 152 smw->smw_period = SBWDOG_DEFAULT_PERIOD; /* XXX needed?? */ 153 } else if (smw->smw_period > 8) { 154 /* Maximum of 2^23 usec watchdog period. */ 155 return (EINVAL); 156 } 157 sc->sc_wdog_period = smw->smw_period; 158 sc->sc_wdog_armed = 1; 159 WRITE_REG(sc->sc_addr + R_SCD_WDOG_INIT, 160 sc->sc_wdog_period * V_SCD_WDOG_FREQ); 161 162 /* Watchdog is armed by tickling it. */ 163 sbwdog_tickle(smw); 164 } 165 return (0); 166 } 167
Indexes created Wed Oct 29 05:09:45 GMT 2025