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