1 /* $NetBSD: gemini_wdt.c,v 1.4 2019/01/08 19:41:10 jdolecek Exp $ */ 2 3 /* 4 * OMAP watchdog timers, common code 5 * 6 * Copyright (c) 2007 Microsoft 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Microsoft 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 22 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 23 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 27 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 36 #include <sys/param.h> 37 #include <sys/callout.h> 38 #include <sys/cdefs.h> 39 #include <sys/device.h> 40 #include <sys/kernel.h> 41 #include <sys/systm.h> 42 #include <sys/wdog.h> 43 44 #include <sys/bus.h> 45 #include <dev/sysmon/sysmonvar.h> 46 47 #include <arm/gemini/gemini_wdtvar.h> 48 #include <arm/gemini/gemini_reg.h> 49 50 geminiwdt_softc_t *geminiwdt_sc; 51 52 #define WATCHDOG_COUNT(nsec) \ 53 (GEMINI_WDT_CLOCK_FREQ * (nsec)) 54 55 56 static void 57 geminiwdt_start(void) 58 { 59 geminiwdt_softc_t *sc = geminiwdt_sc; 60 uint32_t r; 61 62 r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR); 63 r |= (WDT_WDCR_RESET_ENB 64 |WDT_WDCR_ENB); 65 bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR, r); 66 } 67 68 static void 69 geminiwdt_stop(void) 70 { 71 geminiwdt_softc_t *sc = geminiwdt_sc; 72 uint32_t r; 73 74 r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR); 75 r &= ~(WDT_WDCR_EXTSIG_ENB 76 |WDT_WDCR_RESET_ENB 77 |WDT_WDCR_INTR_ENB 78 |WDT_WDCR_ENB); 79 bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR, r); 80 bus_space_write_4(sc->sc_iot, sc->sc_ioh, 81 GEMINI_WDT_WDCLEAR, WDT_WDCLEAR_CLEAR); 82 } 83 84 static void 85 geminiwdt_do_set_timeout(void) 86 { 87 geminiwdt_softc_t *sc = geminiwdt_sc; 88 uint32_t r; 89 90 /* 91 * Disable the watchdog timer 92 */ 93 if (sc->sc_armed) 94 geminiwdt_stop(); 95 96 /* 97 * Set WdLoad register 98 */ 99 r = (sc->sc_smw.smw_period != 0) ? 100 WATCHDOG_COUNT(sc->sc_smw.smw_period) : WDT_WDLOAD_DFLT; 101 bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDLOAD, r); 102 103 /* 104 * feed MAGIC treat to dog 105 */ 106 bus_space_write_4(sc->sc_iot, sc->sc_ioh, 107 GEMINI_WDT_WDRESTART, WDT_WDRESTART_MAGIC); 108 109 /* 110 * Select PCLK clock source 111 */ 112 r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR); 113 r &= ~WDCR_CLKSRC_5MHZ; 114 bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR, r); 115 116 /* 117 * Enable the timer 118 */ 119 if (sc->sc_armed) 120 geminiwdt_start(); 121 } 122 123 void 124 geminiwdt_set_timeout(unsigned int period) 125 { 126 geminiwdt_softc_t *sc = geminiwdt_sc; 127 int s = splhigh(); 128 129 if (period != sc->sc_smw.smw_period) { 130 sc->sc_smw.smw_period = period; 131 geminiwdt_do_set_timeout(); 132 } 133 134 splx(s); 135 } 136 137 int 138 geminiwdt_enable(int enable) 139 { 140 geminiwdt_softc_t *sc = geminiwdt_sc; 141 int s; 142 int prev_state = geminiwdt_sc->sc_armed; 143 144 /* Normalize the int to a boolean so we can compare values directly. 145 */ 146 enable = !!enable; 147 148 s = splhigh(); 149 150 if (enable != sc->sc_armed) { 151 if (enable) { 152 /* Make sure that the watchdog timeout is up to date. 153 */ 154 geminiwdt_do_set_timeout(); 155 geminiwdt_start(); 156 } else { 157 geminiwdt_stop(); 158 } 159 sc->sc_armed = enable; 160 } 161 162 splx(s); 163 return prev_state; 164 } 165 166 int 167 geminiwdt_setmode(struct sysmon_wdog *smw) 168 { 169 geminiwdt_softc_t *sc = smw->smw_cookie; 170 int error = 0; 171 172 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 173 geminiwdt_enable(0); 174 } else { 175 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 176 sc->sc_smw.smw_period = WDT_WDLOAD_DFLT; 177 else 178 sc->sc_smw.smw_period = smw->smw_period; 179 geminiwdt_set_timeout(sc->sc_smw.smw_period); 180 geminiwdt_enable(1); 181 } 182 return error; 183 } 184 185 int 186 geminiwdt_tickle(struct sysmon_wdog *smw) 187 { 188 geminiwdt_softc_t *sc = geminiwdt_sc; 189 int s = splhigh(); 190 191 /* 192 * feed the dog a MAGIC treat 193 */ 194 bus_space_write_4(sc->sc_iot, sc->sc_ioh, 195 GEMINI_WDT_WDRESTART, WDT_WDRESTART_MAGIC); 196 197 splx(s); 198 return 0; 199 } 200
Indexes created Sat Sep 20 22:09:52 GMT 2025