1 /*- 2 * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org> 3 * Copyright (c) 2016 Emmanuel Vadot <manu@bidouilliste.com> 4 * All rights reserved. 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 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/watchdog.h> 33 #include <sys/reboot.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/module.h> 38 #include <sys/mutex.h> 39 #include <sys/rman.h> 40 41 #include <dev/fdt/fdt_common.h> 42 #include <dev/ofw/openfirm.h> 43 #include <dev/ofw/ofw_bus.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 46 #include <machine/bus.h> 47 #include <machine/cpufunc.h> 48 #include <machine/machdep.h> 49 50 #include <arm/allwinner/aw_wdog.h> 51 52 #define READ(_sc, _r) bus_read_4((_sc)->res, (_r)) 53 #define WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v)) 54 55 #define A10_WDOG_CTRL 0x00 56 #define A31_WDOG_CTRL 0x10 57 #define WDOG_CTRL_RESTART (1 << 0) 58 #define A31_WDOG_CTRL_KEY (0xa57 << 1) 59 #define A10_WDOG_MODE 0x04 60 #define A31_WDOG_MODE 0x18 61 #define A10_WDOG_MODE_INTVL_SHIFT 3 62 #define A31_WDOG_MODE_INTVL_SHIFT 4 63 #define A10_WDOG_MODE_RST_EN (1 << 1) 64 #define WDOG_MODE_EN (1 << 0) 65 #define A31_WDOG_CONFIG 0x14 66 #define A31_WDOG_CONFIG_RST_EN_SYSTEM (1 << 0) 67 #define A31_WDOG_CONFIG_RST_EN_INT (2 << 0) 68 69 struct aw_wdog_interval { 70 uint64_t milliseconds; 71 unsigned int value; 72 }; 73 74 struct aw_wdog_interval wd_intervals[] = { 75 { 500, 0 }, 76 { 1000, 1 }, 77 { 2000, 2 }, 78 { 3000, 3 }, 79 { 4000, 4 }, 80 { 5000, 5 }, 81 { 6000, 6 }, 82 { 8000, 7 }, 83 { 10000, 8 }, 84 { 12000, 9 }, 85 { 14000, 10 }, 86 { 16000, 11 }, 87 { 0, 0 } /* sentinel */ 88 }; 89 90 static struct aw_wdog_softc *aw_wdog_sc = NULL; 91 92 struct aw_wdog_softc { 93 device_t dev; 94 struct resource * res; 95 struct mtx mtx; 96 uint8_t wdog_ctrl; 97 uint32_t wdog_ctrl_key; 98 uint8_t wdog_mode; 99 uint8_t wdog_mode_intvl_shift; 100 uint8_t wdog_mode_en; 101 uint8_t wdog_config; 102 uint8_t wdog_config_value; 103 }; 104 105 #define A10_WATCHDOG 1 106 #define A31_WATCHDOG 2 107 108 static struct ofw_compat_data compat_data[] = { 109 {"allwinner,sun4i-a10-wdt", A10_WATCHDOG}, 110 {"allwinner,sun6i-a31-wdt", A31_WATCHDOG}, 111 {NULL, 0} 112 }; 113 114 static void aw_wdog_watchdog_fn(void *, u_int, int *); 115 static void aw_wdog_shutdown_fn(void *, int); 116 117 static int 118 aw_wdog_probe(device_t dev) 119 { 120 struct aw_wdog_softc *sc; 121 122 sc = device_get_softc(dev); 123 124 if (!ofw_bus_status_okay(dev)) 125 return (ENXIO); 126 switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) { 127 case A10_WATCHDOG: 128 device_set_desc(dev, "Allwinner A10 Watchdog"); 129 return (BUS_PROBE_DEFAULT); 130 case A31_WATCHDOG: 131 device_set_desc(dev, "Allwinner A31 Watchdog"); 132 return (BUS_PROBE_DEFAULT); 133 } 134 return (ENXIO); 135 } 136 137 static int 138 aw_wdog_attach(device_t dev) 139 { 140 struct aw_wdog_softc *sc; 141 int rid; 142 143 if (aw_wdog_sc != NULL) 144 return (ENXIO); 145 146 sc = device_get_softc(dev); 147 sc->dev = dev; 148 149 rid = 0; 150 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 151 if (sc->res == NULL) { 152 device_printf(dev, "could not allocate memory resource\n"); 153 return (ENXIO); 154 } 155 156 aw_wdog_sc = sc; 157 158 switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) { 159 case A10_WATCHDOG: 160 sc->wdog_ctrl = A10_WDOG_CTRL; 161 sc->wdog_mode = A10_WDOG_MODE; 162 sc->wdog_mode_intvl_shift = A10_WDOG_MODE_INTVL_SHIFT; 163 sc->wdog_mode_en = A10_WDOG_MODE_RST_EN | WDOG_MODE_EN; 164 break; 165 case A31_WATCHDOG: 166 sc->wdog_ctrl = A31_WDOG_CTRL; 167 sc->wdog_ctrl_key = A31_WDOG_CTRL_KEY; 168 sc->wdog_mode = A31_WDOG_MODE; 169 sc->wdog_mode_intvl_shift = A31_WDOG_MODE_INTVL_SHIFT; 170 sc->wdog_mode_en = WDOG_MODE_EN; 171 sc->wdog_config = A31_WDOG_CONFIG; 172 sc->wdog_config_value = A31_WDOG_CONFIG_RST_EN_SYSTEM; 173 break; 174 default: 175 bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->res); 176 return (ENXIO); 177 } 178 179 mtx_init(&sc->mtx, "AW Watchdog", "aw_wdog", MTX_DEF); 180 EVENTHANDLER_REGISTER(watchdog_list, aw_wdog_watchdog_fn, sc, 0); 181 EVENTHANDLER_REGISTER(shutdown_final, aw_wdog_shutdown_fn, sc, 182 SHUTDOWN_PRI_LAST - 1); 183 184 return (0); 185 } 186 187 static void 188 aw_wdog_watchdog_fn(void *private, u_int cmd, int *error) 189 { 190 struct aw_wdog_softc *sc; 191 uint64_t ms; 192 int i; 193 194 sc = private; 195 mtx_lock(&sc->mtx); 196 197 cmd &= WD_INTERVAL; 198 199 if (cmd > 0) { 200 ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000; 201 i = 0; 202 while (wd_intervals[i].milliseconds && 203 (ms > wd_intervals[i].milliseconds)) 204 i++; 205 if (wd_intervals[i].milliseconds) { 206 WRITE(sc, sc->wdog_mode, 207 (wd_intervals[i].value << sc->wdog_mode_intvl_shift) | 208 sc->wdog_mode_en); 209 WRITE(sc, sc->wdog_ctrl, 210 WDOG_CTRL_RESTART | sc->wdog_ctrl_key); 211 if (sc->wdog_config) 212 WRITE(sc, sc->wdog_config, 213 sc->wdog_config_value); 214 *error = 0; 215 } 216 else { 217 /* 218 * Can't arm 219 * disable watchdog as watchdog(9) requires 220 */ 221 device_printf(sc->dev, 222 "Can't arm, timeout is more than 16 sec\n"); 223 mtx_unlock(&sc->mtx); 224 WRITE(sc, sc->wdog_mode, 0); 225 return; 226 } 227 } 228 else 229 WRITE(sc, sc->wdog_mode, 0); 230 231 mtx_unlock(&sc->mtx); 232 } 233 234 static void 235 aw_wdog_shutdown_fn(void *private, int howto) 236 { 237 if ((howto & (RB_POWEROFF|RB_HALT)) == 0) 238 aw_wdog_watchdog_reset(); 239 } 240 241 void 242 aw_wdog_watchdog_reset() 243 { 244 245 if (aw_wdog_sc == NULL) { 246 printf("Reset: watchdog device has not been initialized\n"); 247 return; 248 } 249 250 WRITE(aw_wdog_sc, aw_wdog_sc->wdog_mode, 251 (wd_intervals[0].value << aw_wdog_sc->wdog_mode_intvl_shift) | 252 aw_wdog_sc->wdog_mode_en); 253 if (aw_wdog_sc->wdog_config) 254 WRITE(aw_wdog_sc, aw_wdog_sc->wdog_config, 255 aw_wdog_sc->wdog_config_value); 256 WRITE(aw_wdog_sc, aw_wdog_sc->wdog_ctrl, 257 WDOG_CTRL_RESTART | aw_wdog_sc->wdog_ctrl_key); 258 while(1) 259 ; 260 261 } 262 263 static device_method_t aw_wdog_methods[] = { 264 DEVMETHOD(device_probe, aw_wdog_probe), 265 DEVMETHOD(device_attach, aw_wdog_attach), 266 267 DEVMETHOD_END 268 }; 269 270 static driver_t aw_wdog_driver = { 271 "aw_wdog", 272 aw_wdog_methods, 273 sizeof(struct aw_wdog_softc), 274 }; 275 static devclass_t aw_wdog_devclass; 276 277 DRIVER_MODULE(aw_wdog, simplebus, aw_wdog_driver, aw_wdog_devclass, 0, 0); 278