1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2020 Poul-Henning Kamp 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 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/kernel.h> 33 #include <sys/bus.h> 34 #include <sys/eventhandler.h> 35 #include <sys/module.h> 36 #include <sys/rman.h> 37 #include <sys/systm.h> 38 #include <sys/watchdog.h> 39 40 #include <dev/superio/superio.h> 41 42 #include <machine/bus.h> 43 #include <machine/resource.h> 44 45 struct ftwd_softc { 46 eventhandler_tag wd_ev; 47 }; 48 49 static void 50 ftwd_func(void *priv, u_int cmd, int *error) 51 { 52 device_t dev = priv; 53 uint64_t timeout; 54 uint8_t val = 0; 55 uint8_t minutes = 0; 56 57 if (cmd != 0) { 58 cmd &= WD_INTERVAL; 59 60 /* Convert the requested timeout to seconds. */ 61 if (cmd >= WD_TO_1SEC) 62 timeout = (uint64_t)1 << (cmd - WD_TO_1SEC); 63 else 64 timeout = 1; 65 66 if (timeout <= UINT8_MAX) { 67 val = timeout; 68 *error = 0; 69 } else if ((timeout / 60) <= UINT8_MAX) { 70 val = timeout / 60; 71 minutes = 1; 72 *error = 0; 73 } 74 } 75 if (bootverbose) { 76 if (val == 0) { 77 device_printf(dev, "disabling watchdog\n"); 78 } else { 79 device_printf(dev, 80 "arm watchdog to %d %s%s (Was: 0x%02x)\n", 81 val, minutes ? "minute" : "second", 82 val == 1 ? "" : "s", 83 superio_read(dev, 0xf6) 84 ); 85 } 86 } 87 superio_write(dev, 0xf0, 0x00); // Disable WDTRST# 88 superio_write(dev, 0xf6, val); // Set Counter 89 90 if (minutes) 91 superio_write(dev, 0xf5, 0x7d); // minutes, act high, 125ms 92 else 93 superio_write(dev, 0xf5, 0x75); // seconds, act high, 125ms 94 95 if (val) 96 superio_write(dev, 0xf7, 0x01); // Disable PME 97 if (val) 98 superio_write(dev, 0xf0, 0x81); // Enable WDTRST# 99 else 100 superio_write(dev, 0xf0, 0x00); // Disable WDTRST 101 } 102 103 static int 104 ftwd_probe(device_t dev) 105 { 106 107 if (superio_vendor(dev) != SUPERIO_VENDOR_FINTEK || 108 superio_get_type(dev) != SUPERIO_DEV_WDT) 109 return (ENXIO); 110 device_set_desc(dev, "Watchdog Timer on Fintek SuperIO"); 111 return (BUS_PROBE_DEFAULT); 112 } 113 114 static int 115 ftwd_attach(device_t dev) 116 { 117 struct ftwd_softc *sc = device_get_softc(dev); 118 119 /* 120 * We do not touch the watchdog at this time, it might be armed 121 * by firmware to protect the full boot sequence. 122 */ 123 124 sc->wd_ev = EVENTHANDLER_REGISTER(watchdog_list, ftwd_func, dev, 0); 125 return (0); 126 } 127 128 static int 129 ftwd_detach(device_t dev) 130 { 131 struct ftwd_softc *sc = device_get_softc(dev); 132 int dummy; 133 134 if (sc->wd_ev != NULL) 135 EVENTHANDLER_DEREGISTER(watchdog_list, sc->wd_ev); 136 ftwd_func(dev, 0, &dummy); 137 return (0); 138 } 139 140 static device_method_t ftwd_methods[] = { 141 DEVMETHOD(device_probe, ftwd_probe), 142 DEVMETHOD(device_attach, ftwd_attach), 143 DEVMETHOD(device_detach, ftwd_detach), 144 { 0, 0 } 145 }; 146 147 static driver_t ftwd_driver = { 148 "ftwd", 149 ftwd_methods, 150 sizeof (struct ftwd_softc) 151 }; 152 153 static devclass_t ftwd_devclass; 154 155 DRIVER_MODULE(ftwd, superio, ftwd_driver, ftwd_devclass, NULL, NULL); 156 MODULE_DEPEND(ftwd, superio, 1, 1, 1); 157 MODULE_VERSION(ftwd, 1); 158