1/*- 2 * Copyright (c) 2006 Sam Leffler. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 23 */ 24#include <sys/cdefs.h> 25__FBSDID("$FreeBSD$"); 26 27/* 28 * IXP4XX Watchdog Timer Support. 29 */ 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <sys/time.h> 35#include <sys/bus.h> 36#include <sys/resource.h> 37#include <sys/rman.h> 38#include <sys/watchdog.h> 39 40#include <machine/bus.h> 41#include <machine/cpu.h> 42#include <machine/cpufunc.h> 43#include <machine/frame.h> 44#include <machine/resource.h> 45#include <machine/intr.h> 46 47#include <arm/xscale/ixp425/ixp425reg.h> 48#include <arm/xscale/ixp425/ixp425var.h> 49 50struct ixpwdog_softc { 51 device_t sc_dev; 52}; 53 54static __inline uint32_t 55RD4(struct ixpwdog_softc *sc, bus_size_t off) 56{ 57 return bus_space_read_4(&ixp425_bs_tag, IXP425_TIMER_VBASE, off); 58} 59 60static __inline void 61WR4(struct ixpwdog_softc *sc, bus_size_t off, uint32_t val) 62{ 63 bus_space_write_4(&ixp425_bs_tag, IXP425_TIMER_VBASE, off, val); 64} 65 66static void 67ixp425_watchdog(void *arg, u_int cmd, int *error) 68{ 69 struct ixpwdog_softc *sc = arg; 70 u_int u = cmd & WD_INTERVAL; 71 72 WR4(sc, IXP425_OST_WDOG_KEY, OST_WDOG_KEY_MAJICK); 73 if (4 <= u && u <= 35) { 74 WR4(sc, IXP425_OST_WDOG_ENAB, 0); 75 /* approximate 66.66MHz cycles */ 76 WR4(sc, IXP425_OST_WDOG, 2<<(u - 4)); 77 /* NB: reset on timer expiration */ 78 WR4(sc, IXP425_OST_WDOG_ENAB, 79 OST_WDOG_ENAB_CNT_ENA | OST_WDOG_ENAB_RST_ENA); 80 *error = 0; 81 } else { 82 /* disable watchdog */ 83 WR4(sc, IXP425_OST_WDOG_ENAB, 0); 84 } 85 WR4(sc, IXP425_OST_WDOG_KEY, 0); 86} 87 88static int 89ixpwdog_probe(device_t dev) 90{ 91 device_set_desc(dev, "IXP4XX Watchdog Timer"); 92 return (0); 93} 94 95static int 96ixpwdog_attach(device_t dev) 97{ 98 struct ixpwdog_softc *sc = device_get_softc(dev); 99 100 sc->sc_dev = dev; 101 102 EVENTHANDLER_REGISTER(watchdog_list, ixp425_watchdog, sc, 0); 103 return (0); 104} 105 106static device_method_t ixpwdog_methods[] = { 107 DEVMETHOD(device_probe, ixpwdog_probe), 108 DEVMETHOD(device_attach, ixpwdog_attach), 109 {0, 0}, 110}; 111 112static driver_t ixpwdog_driver = { 113 "ixpwdog", 114 ixpwdog_methods, 115 sizeof(struct ixpwdog_softc), 116}; 117static devclass_t ixpwdog_devclass; 118DRIVER_MODULE(ixpwdog, ixp, ixpwdog_driver, ixpwdog_devclass, 0, 0); 119