gemini_wdt.c revision 1.1
1 /* $NetBSD: gemini_wdt.c,v 1.1 2008/10/24 04:23:18 matt 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 <machine/param.h> 45 #include <machine/bus.h> 46 #include <dev/sysmon/sysmonvar.h> 47 48 #include <arm/gemini/gemini_wdtvar.h> 49 #include <arm/gemini/gemini_reg.h> 50 51 geminiwdt_softc_t *geminiwdt_sc; 52 53 #define WATCHDOG_COUNT(nsec) \ 54 (GEMINI_WDT_CLOCK_FREQ * (nsec)) 55 56 57 static void 58 geminiwdt_start(void) 59 { 60 geminiwdt_softc_t *sc = geminiwdt_sc; 61 uint32_t r; 62 63 r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR); 64 r |= (WDT_WDCR_RESET_ENB 65 |WDT_WDCR_ENB); 66 bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR, r); 67 } 68 69 static void 70 geminiwdt_stop(void) 71 { 72 geminiwdt_softc_t *sc = geminiwdt_sc; 73 uint32_t r; 74 75 r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR); 76 r &= ~(WDT_WDCR_EXTSIG_ENB 77 |WDT_WDCR_RESET_ENB 78 |WDT_WDCR_INTR_ENB 79 |WDT_WDCR_ENB); 80 bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR, r); 81 bus_space_write_4(sc->sc_iot, sc->sc_ioh, 82 GEMINI_WDT_WDCLEAR, WDT_WDCLEAR_CLEAR); 83 } 84 85 static void 86 geminiwdt_do_set_timeout(void) 87 { 88 geminiwdt_softc_t *sc = geminiwdt_sc; 89 uint32_t r; 90 91 /* 92 * Disable the watchdog timer 93 */ 94 if (sc->sc_armed) 95 geminiwdt_stop(); 96 97 /* 98 * Set WdLoad register 99 */ 100 r = (sc->sc_smw.smw_period != 0) ? 101 WATCHDOG_COUNT(sc->sc_smw.smw_period) : WDT_WDLOAD_DFLT; 102 bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDLOAD, r); 103 104 /* 105 * feed MAGIC treat to dog 106 */ 107 bus_space_write_4(sc->sc_iot, sc->sc_ioh, 108 GEMINI_WDT_WDRESTART, WDT_WDRESTART_MAGIC); 109 110 /* 111 * Select PCLK clock source 112 */ 113 r = bus_space_read_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR); 114 r &= ~WDCR_CLKSRC_5MHZ; 115 bus_space_write_4(sc->sc_iot, sc->sc_ioh, GEMINI_WDT_WDCR, r); 116 117 /* 118 * Enable the timer 119 */ 120 if (sc->sc_armed) 121 geminiwdt_start(); 122 } 123 124 void 125 geminiwdt_set_timeout(unsigned int period) 126 { 127 geminiwdt_softc_t *sc = geminiwdt_sc; 128 int s = splhigh(); 129 130 if (period != sc->sc_smw.smw_period) { 131 sc->sc_smw.smw_period = period; 132 geminiwdt_do_set_timeout(); 133 } 134 135 splx(s); 136 } 137 138 int 139 geminiwdt_enable(int enable) 140 { 141 geminiwdt_softc_t *sc = geminiwdt_sc; 142 int s; 143 int prev_state = geminiwdt_sc->sc_armed; 144 145 /* Normalize the int to a boolean so we can compare values directly. 146 */ 147 enable = !!enable; 148 149 s = splhigh(); 150 151 if (enable != sc->sc_armed) { 152 if (enable) { 153 /* Make sure that the watchdog timeout is up to date. 154 */ 155 geminiwdt_do_set_timeout(); 156 geminiwdt_start(); 157 } else { 158 geminiwdt_stop(); 159 } 160 sc->sc_armed = enable; 161 } 162 163 splx(s); 164 return prev_state; 165 } 166 167 int 168 geminiwdt_setmode(struct sysmon_wdog *smw) 169 { 170 geminiwdt_softc_t *sc = smw->smw_cookie; 171 int error = 0; 172 173 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) { 174 geminiwdt_enable(0); 175 } else { 176 if (smw->smw_period == WDOG_PERIOD_DEFAULT) 177 sc->sc_smw.smw_period = WDT_WDLOAD_DFLT; 178 else 179 sc->sc_smw.smw_period = smw->smw_period; 180 geminiwdt_set_timeout(sc->sc_smw.smw_period); 181 geminiwdt_enable(1); 182 } 183 return error; 184 } 185 186 int 187 geminiwdt_tickle(struct sysmon_wdog *smw) 188 { 189 geminiwdt_softc_t *sc = geminiwdt_sc; 190 int s = splhigh(); 191 192 /* 193 * feed the dog a MAGIC treat 194 */ 195 bus_space_write_4(sc->sc_iot, sc->sc_ioh, 196 GEMINI_WDT_WDRESTART, WDT_WDRESTART_MAGIC); 197 198 splx(s); 199 return 0; 200 } 201 202 void 203 geminiwdt_reboot(void) 204 { 205 int s = splhigh(); 206 207 geminiwdt_set_timeout(30); 208 geminiwdt_start(); 209 delay(100); 210 splx(s); 211 } 212
Indexes created Fri Sep 26 20:09:58 GMT 2025