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