/* $OpenBSD: imxdog.c,v 1.1 2013/09/06 20:45:53 patrick Exp $ */ /* * Copyright (c) 2012-2013 Patrick Wildt * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include #include /* registers */ #define WCR 0x00 #define WSR 0x02 #define WRSR 0x04 #define WICR 0x06 #define WMCR 0x08 struct imxdog_softc { struct device sc_dev; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; }; struct imxdog_softc *imxdog_sc; void imxdog_attach(struct device *parent, struct device *self, void *args); void imxdog_reset(void); struct cfattach imxdog_ca = { sizeof (struct imxdog_softc), NULL, imxdog_attach }; struct cfdriver imxdog_cd = { NULL, "imxdog", DV_DULL }; void imxdog_attach(struct device *parent, struct device *self, void *args) { struct imx_attach_args *ia = args; struct imxdog_softc *sc = (struct imxdog_softc *) self; sc->sc_iot = ia->ia_iot; if (bus_space_map(sc->sc_iot, ia->ia_dev->mem[0].addr, ia->ia_dev->mem[0].size, 0, &sc->sc_ioh)) panic("imxdog_attach: bus_space_map failed!"); printf("\n"); imxdog_sc = sc; } void imxdog_reset() { if (imxdog_sc == NULL) return; /* disable watchdog and set timeout to 0 */ bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WCR, 0); /* sequence to reset timeout counter */ bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WSR, 0x5555); bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WSR, 0xaaaa); /* enable watchdog */ bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WCR, 1); /* errata TKT039676 */ bus_space_write_2(imxdog_sc->sc_iot, imxdog_sc->sc_ioh, WCR, 1); delay(100000); }