1239922Sgonzo/*- 2239922Sgonzo * Copyright (c) 2012 Alexander Rybalko <ray@freebsd.org> 3239922Sgonzo * All rights reserved. 4239922Sgonzo * 5239922Sgonzo * Redistribution and use in source and binary forms, with or without 6239922Sgonzo * modification, are permitted provided that the following conditions 7239922Sgonzo * are met: 8239922Sgonzo * 1. Redistributions of source code must retain the above copyright 9239922Sgonzo * notice, this list of conditions and the following disclaimer. 10239922Sgonzo * 2. Redistributions in binary form must reproduce the above copyright 11239922Sgonzo * notice, this list of conditions and the following disclaimer in the 12239922Sgonzo * documentation and/or other materials provided with the distribution. 13239922Sgonzo * 14239922Sgonzo * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15239922Sgonzo * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16239922Sgonzo * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17239922Sgonzo * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18239922Sgonzo * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19239922Sgonzo * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20239922Sgonzo * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21239922Sgonzo * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22239922Sgonzo * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23239922Sgonzo * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24239922Sgonzo * SUCH DAMAGE. 25239922Sgonzo */ 26239922Sgonzo#include <sys/cdefs.h> 27239922Sgonzo__FBSDID("$FreeBSD$"); 28239922Sgonzo 29239922Sgonzo#include <sys/param.h> 30239922Sgonzo#include <sys/systm.h> 31239922Sgonzo#include <sys/watchdog.h> 32239922Sgonzo#include <sys/bus.h> 33239922Sgonzo#include <sys/kernel.h> 34239922Sgonzo#include <sys/module.h> 35239922Sgonzo#include <sys/rman.h> 36239922Sgonzo 37239922Sgonzo#include <dev/fdt/fdt_common.h> 38239922Sgonzo#include <dev/ofw/openfirm.h> 39239922Sgonzo#include <dev/ofw/ofw_bus.h> 40239922Sgonzo#include <dev/ofw/ofw_bus_subr.h> 41239922Sgonzo 42239922Sgonzo#include <machine/bus.h> 43239922Sgonzo#include <machine/cpufunc.h> 44239922Sgonzo#include <machine/machdep.h> 45239922Sgonzo#include <machine/fdt.h> 46239922Sgonzo 47239922Sgonzo#include <arm/broadcom/bcm2835/bcm2835_wdog.h> 48239922Sgonzo 49239922Sgonzo#define BCM2835_PASWORD 0x5a 50239922Sgonzo 51239922Sgonzo#define BCM2835_WDOG_RESET 0 52239922Sgonzo#define BCM2835_PASSWORD_MASK 0xff000000 53239922Sgonzo#define BCM2835_PASSWORD_SHIFT 24 54239922Sgonzo#define BCM2835_WDOG_TIME_MASK 0x000fffff 55239922Sgonzo#define BCM2835_WDOG_TIME_SHIFT 0 56239922Sgonzo 57239922Sgonzo#define READ(_sc, _r) bus_space_read_4((_sc)->bst, (_sc)->bsh, (_r)) 58239922Sgonzo#define WRITE(_sc, _r, _v) bus_space_write_4((_sc)->bst, (_sc)->bsh, (_r), (_v)) 59239922Sgonzo 60239922Sgonzo#define BCM2835_RSTC_WRCFG_CLR 0xffffffcf 61239922Sgonzo#define BCM2835_RSTC_WRCFG_SET 0x00000030 62239922Sgonzo#define BCM2835_RSTC_WRCFG_FULL_RESET 0x00000020 63239922Sgonzo#define BCM2835_RSTC_RESET 0x00000102 64239922Sgonzo 65239922Sgonzo#define BCM2835_RSTC_REG 0x00 66239922Sgonzo#define BCM2835_RSTS_REG 0x04 67239922Sgonzo#define BCM2835_WDOG_REG 0x08 68239922Sgonzo 69239922Sgonzostatic struct bcmwd_softc *bcmwd_lsc = NULL; 70239922Sgonzo 71239922Sgonzostruct bcmwd_softc { 72239922Sgonzo device_t dev; 73239922Sgonzo struct resource * res; 74239922Sgonzo bus_space_tag_t bst; 75239922Sgonzo bus_space_handle_t bsh; 76239922Sgonzo int wdog_armed; 77239922Sgonzo int wdog_period; 78239922Sgonzo char wdog_passwd; 79239922Sgonzo}; 80239922Sgonzo 81239922Sgonzo#ifdef notyet 82239922Sgonzostatic void bcmwd_watchdog_fn(void *private, u_int cmd, int *error); 83239922Sgonzo#endif 84239922Sgonzo 85239922Sgonzostatic int 86239922Sgonzobcmwd_probe(device_t dev) 87239922Sgonzo{ 88239922Sgonzo 89239922Sgonzo if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-wdt")) { 90239922Sgonzo device_set_desc(dev, "BCM2708/2835 Watchdog"); 91239922Sgonzo return (BUS_PROBE_DEFAULT); 92239922Sgonzo } 93239922Sgonzo 94239922Sgonzo return (ENXIO); 95239922Sgonzo} 96239922Sgonzo 97239922Sgonzostatic int 98239922Sgonzobcmwd_attach(device_t dev) 99239922Sgonzo{ 100239922Sgonzo struct bcmwd_softc *sc; 101239922Sgonzo int rid; 102239922Sgonzo 103239922Sgonzo if (bcmwd_lsc != NULL) 104239922Sgonzo return (ENXIO); 105239922Sgonzo 106239922Sgonzo sc = device_get_softc(dev); 107239922Sgonzo sc->wdog_period = 7; 108239922Sgonzo sc->wdog_passwd = BCM2835_PASWORD; 109239922Sgonzo sc->wdog_armed = 0; 110239922Sgonzo sc->dev = dev; 111239922Sgonzo 112239922Sgonzo rid = 0; 113239922Sgonzo sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 114239922Sgonzo if (sc->res == NULL) { 115239922Sgonzo device_printf(dev, "could not allocate memory resource\n"); 116239922Sgonzo return (ENXIO); 117239922Sgonzo } 118239922Sgonzo 119239922Sgonzo sc->bst = rman_get_bustag(sc->res); 120239922Sgonzo sc->bsh = rman_get_bushandle(sc->res); 121239922Sgonzo 122239922Sgonzo bcmwd_lsc = sc; 123239922Sgonzo#ifdef notyet 124239922Sgonzo EVENTHANDLER_REGISTER(watchdog_list, bcmwd_watchdog_fn, sc, 0); 125239922Sgonzo#endif 126239922Sgonzo return (0); 127239922Sgonzo} 128239922Sgonzo 129239922Sgonzo#ifdef notyet 130239922Sgonzostatic void 131239922Sgonzobcmwd_watchdog_fn(void *private, u_int cmd, int *error) 132239922Sgonzo{ 133239922Sgonzo /* XXX: not yet */ 134239922Sgonzo} 135239922Sgonzo#endif 136239922Sgonzo 137239922Sgonzovoid 138239922Sgonzobcmwd_watchdog_reset() 139239922Sgonzo{ 140239922Sgonzo 141239922Sgonzo if (bcmwd_lsc == NULL) 142239922Sgonzo return; 143239922Sgonzo 144239922Sgonzo WRITE(bcmwd_lsc, BCM2835_WDOG_REG, 145239922Sgonzo (BCM2835_PASWORD << BCM2835_PASSWORD_SHIFT) | 10); 146239922Sgonzo 147239922Sgonzo WRITE(bcmwd_lsc, BCM2835_RSTC_REG, 148239922Sgonzo (READ(bcmwd_lsc, BCM2835_RSTC_REG) & BCM2835_RSTC_WRCFG_CLR) | 149239922Sgonzo (BCM2835_PASWORD << BCM2835_PASSWORD_SHIFT) | 150239922Sgonzo BCM2835_RSTC_WRCFG_FULL_RESET); 151239922Sgonzo} 152239922Sgonzo 153239922Sgonzostatic device_method_t bcmwd_methods[] = { 154239922Sgonzo DEVMETHOD(device_probe, bcmwd_probe), 155239922Sgonzo DEVMETHOD(device_attach, bcmwd_attach), 156239922Sgonzo 157239922Sgonzo DEVMETHOD_END 158239922Sgonzo}; 159239922Sgonzo 160239922Sgonzostatic driver_t bcmwd_driver = { 161239922Sgonzo "bcmwd", 162239922Sgonzo bcmwd_methods, 163239922Sgonzo sizeof(struct bcmwd_softc), 164239922Sgonzo}; 165239922Sgonzostatic devclass_t bcmwd_devclass; 166239922Sgonzo 167239922SgonzoDRIVER_MODULE(bcmwd, simplebus, bcmwd_driver, bcmwd_devclass, 0, 0); 168