1 /* $NetBSD: epwdog.c,v 1.5 2012/10/27 17:17:37 chs Exp $ */ 2 3 /* 4 * Copyright (c) 2005 HAMAJIMA Katsuomi. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: epwdog.c,v 1.5 2012/10/27 17:17:37 chs Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/device.h> 35 #include <sys/bus.h> 36 #include <arm/ep93xx/ep93xxvar.h> 37 #include <arm/ep93xx/epsocvar.h> 38 #include <arm/ep93xx/epwdogreg.h> 39 #include <arm/ep93xx/epwdogvar.h> 40 41 struct epwdog_softc { 42 bus_space_tag_t sc_iot; 43 bus_space_handle_t sc_ioh; 44 }; 45 46 static int epwdog_match(device_t, cfdata_t, void *); 47 static void epwdog_attach(device_t, device_t, void *); 48 49 CFATTACH_DECL_NEW(epwdog, sizeof(struct epwdog_softc), 50 epwdog_match, epwdog_attach, NULL, NULL); 51 52 static struct epwdog_softc *the_epwdog_sc = 0; 53 54 static int 55 epwdog_match(device_t parent, cfdata_t match, void *aux) 56 { 57 return 1; 58 } 59 60 static void 61 epwdog_attach(device_t parent, device_t self, void *aux) 62 { 63 struct epwdog_softc *sc = device_private(self); 64 struct epsoc_attach_args *sa = aux; 65 66 printf("\n"); 67 sc->sc_iot = sa->sa_iot; 68 69 if (bus_space_map(sa->sa_iot, sa->sa_addr, 70 sa->sa_size, 0, &sc->sc_ioh)) { 71 printf("%s: Cannot map registers", device_xname(self)); 72 return; 73 } 74 75 if (!the_epwdog_sc) 76 the_epwdog_sc = sc; 77 #ifdef DIAGNOSTIC 78 else 79 printf("%s is already configured\n", device_xname(self)); 80 #endif 81 } 82 83 int 84 epwdog_reset(void) 85 { 86 struct epwdog_softc *sc = the_epwdog_sc; 87 88 #ifdef DIAGNOSTIC 89 if (!sc) { 90 printf("epwdog not configured\n"); 91 return (ENXIO); 92 } 93 #endif 94 95 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 96 EP93XX_WDOG_Ctrl, EP93XX_WDOG_DISABLE); 97 splhigh(); 98 bus_space_write_2(sc->sc_iot, sc->sc_ioh, 99 EP93XX_WDOG_Ctrl, EP93XX_WDOG_ENABLE); 100 while (1); 101 102 return 0; /* not reached */ 103 } 104