Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/armada38x/armada38x_rtc.c
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1 /*- 2 * Copyright (c) 2015 Semihalf. 3 * Copyright (c) 2015 Stormshield. 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 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/bus.h> 33 #include <sys/lock.h> 34 #include <sys/time.h> 35 #include <sys/proc.h> 36 #include <sys/conf.h> 37 #include <sys/rman.h> 38 #include <sys/clock.h> 39 #include <sys/systm.h> 40 #include <sys/mutex.h> 41 #include <sys/types.h> 42 #include <sys/kernel.h> 43 #include <sys/module.h> 44 #include <sys/resource.h> 45 46 #include <machine/bus.h> 47 #include <machine/resource.h> 48 49 #include <dev/ofw/ofw_bus.h> 50 #include <dev/ofw/ofw_bus_subr.h> 51 52 #include "clock_if.h" 53 54 #define RTC_RES_US 1000000 55 #define HALF_OF_SEC_NS 500000000 56 57 #define RTC_STATUS 0x0 58 #define RTC_TIME 0xC 59 #define RTC_TEST_CONFIG 0x1C 60 #define RTC_IRQ_1_CONFIG 0x4 61 #define RTC_IRQ_2_CONFIG 0x8 62 #define RTC_ALARM_1 0x10 63 #define RTC_ALARM_2 0x14 64 #define RTC_CLOCK_CORR 0x18 65 66 #define RTC_NOMINAL_TIMING 0x2000 67 #define RTC_NOMINAL_TIMING_MASK 0x7fff 68 69 #define RTC_STATUS_ALARM1_MASK 0x1 70 #define RTC_STATUS_ALARM2_MASK 0x2 71 72 #define MV_RTC_LOCK(sc) mtx_lock_spin(&(sc)->mutex) 73 #define MV_RTC_UNLOCK(sc) mtx_unlock_spin(&(sc)->mutex) 74 75 #define A38X_RTC_BRIDGE_TIMING_CTRL 0x0 76 #define A38X_RTC_WRCLK_PERIOD_SHIFT 0 77 #define A38X_RTC_WRCLK_PERIOD_MASK 0x00000003FF 78 #define A38X_RTC_WRCLK_PERIOD_MAX 0x3FF 79 #define A38X_RTC_READ_OUTPUT_DELAY_SHIFT 26 80 #define A38X_RTC_READ_OUTPUT_DELAY_MASK 0x007C000000 81 #define A38X_RTC_READ_OUTPUT_DELAY_MAX 0x1F 82 83 #define A8K_RTC_BRIDGE_TIMING_CTRL0 0x0 84 #define A8K_RTC_WRCLK_PERIOD_SHIFT 0 85 #define A8K_RTC_WRCLK_PERIOD_MASK 0x000000FFFF 86 #define A8K_RTC_WRCLK_PERIOD_VAL 0x3FF 87 #define A8K_RTC_WRCLK_SETUP_SHIFT 16 88 #define A8K_RTC_WRCLK_SETUP_MASK 0x00FFFF0000 89 #define A8K_RTC_WRCLK_SETUP_VAL 29 90 #define A8K_RTC_BRIDGE_TIMING_CTRL1 0x4 91 #define A8K_RTC_READ_OUTPUT_DELAY_SHIFT 0 92 #define A8K_RTC_READ_OUTPUT_DELAY_MASK 0x000000FFFF 93 #define A8K_RTC_READ_OUTPUT_DELAY_VAL 0x3F 94 95 #define RTC_RES 0 96 #define RTC_SOC_RES 1 97 98 static struct resource_spec res_spec[] = { 99 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 100 { SYS_RES_MEMORY, 1, RF_ACTIVE }, 101 { -1, 0 } 102 }; 103 104 struct mv_rtc_softc { 105 device_t dev; 106 struct resource *res[2]; 107 struct mtx mutex; 108 int rtc_type; 109 }; 110 111 static int mv_rtc_probe(device_t dev); 112 static int mv_rtc_attach(device_t dev); 113 static int mv_rtc_detach(device_t dev); 114 115 static int mv_rtc_gettime(device_t dev, struct timespec *ts); 116 static int mv_rtc_settime(device_t dev, struct timespec *ts); 117 118 static inline uint32_t mv_rtc_reg_read(struct mv_rtc_softc *sc, 119 bus_size_t off); 120 static inline int mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, 121 uint32_t val); 122 static inline void mv_rtc_configure_bus_a38x(struct mv_rtc_softc *sc); 123 static inline void mv_rtc_configure_bus_a8k(struct mv_rtc_softc *sc); 124 125 static device_method_t mv_rtc_methods[] = { 126 DEVMETHOD(device_probe, mv_rtc_probe), 127 DEVMETHOD(device_attach, mv_rtc_attach), 128 DEVMETHOD(device_detach, mv_rtc_detach), 129 130 DEVMETHOD(clock_gettime, mv_rtc_gettime), 131 DEVMETHOD(clock_settime, mv_rtc_settime), 132 133 { 0, 0 }, 134 }; 135 136 static driver_t mv_rtc_driver = { 137 "rtc", 138 mv_rtc_methods, 139 sizeof(struct mv_rtc_softc), 140 }; 141 142 #define RTC_A38X 1 143 #define RTC_A8K 2 144 145 static struct ofw_compat_data mv_rtc_compat[] = { 146 {"marvell,armada-380-rtc", RTC_A38X}, 147 {"marvell,armada-8k-rtc", RTC_A8K}, 148 {NULL, 0}, 149 }; 150 151 DRIVER_MODULE(a38x_rtc, simplebus, mv_rtc_driver, 0, 0); 152 153 static void 154 mv_rtc_reset(device_t dev) 155 { 156 struct mv_rtc_softc *sc; 157 158 sc = device_get_softc(dev); 159 160 /* Reset Test register */ 161 mv_rtc_reg_write(sc, RTC_TEST_CONFIG, 0); 162 DELAY(500000); 163 164 /* Reset Time register */ 165 mv_rtc_reg_write(sc, RTC_TIME, 0); 166 DELAY(62); 167 168 /* Reset Status register */ 169 mv_rtc_reg_write(sc, RTC_STATUS, (RTC_STATUS_ALARM1_MASK | RTC_STATUS_ALARM2_MASK)); 170 DELAY(62); 171 172 /* Turn off Int1 and Int2 sources & clear the Alarm count */ 173 mv_rtc_reg_write(sc, RTC_IRQ_1_CONFIG, 0); 174 mv_rtc_reg_write(sc, RTC_IRQ_2_CONFIG, 0); 175 mv_rtc_reg_write(sc, RTC_ALARM_1, 0); 176 mv_rtc_reg_write(sc, RTC_ALARM_2, 0); 177 178 /* Setup nominal register access timing */ 179 mv_rtc_reg_write(sc, RTC_CLOCK_CORR, RTC_NOMINAL_TIMING); 180 181 /* Reset Time register */ 182 mv_rtc_reg_write(sc, RTC_TIME, 0); 183 DELAY(10); 184 185 /* Reset Status register */ 186 mv_rtc_reg_write(sc, RTC_STATUS, (RTC_STATUS_ALARM1_MASK | RTC_STATUS_ALARM2_MASK)); 187 DELAY(50); 188 } 189 190 static int 191 mv_rtc_probe(device_t dev) 192 { 193 194 if (!ofw_bus_status_okay(dev)) 195 return (ENXIO); 196 197 if (!ofw_bus_search_compatible(dev, mv_rtc_compat)->ocd_data) 198 return (ENXIO); 199 200 device_set_desc(dev, "Marvell Integrated RTC"); 201 202 return (BUS_PROBE_DEFAULT); 203 } 204 205 static int 206 mv_rtc_attach(device_t dev) 207 { 208 struct mv_rtc_softc *sc; 209 int ret; 210 211 sc = device_get_softc(dev); 212 sc->dev = dev; 213 sc->rtc_type = ofw_bus_search_compatible(dev, mv_rtc_compat)->ocd_data; 214 215 mtx_init(&sc->mutex, device_get_nameunit(dev), NULL, MTX_SPIN); 216 217 ret = bus_alloc_resources(dev, res_spec, sc->res); 218 if (ret != 0) { 219 device_printf(dev, "could not allocate resources\n"); 220 mtx_destroy(&sc->mutex); 221 return (ENXIO); 222 } 223 224 switch (sc->rtc_type) { 225 case RTC_A38X: 226 mv_rtc_configure_bus_a38x(sc); 227 break; 228 case RTC_A8K: 229 mv_rtc_configure_bus_a8k(sc); 230 break; 231 default: 232 panic("Unknown RTC type: %d", sc->rtc_type); 233 } 234 clock_register(dev, RTC_RES_US); 235 236 return (0); 237 } 238 239 static int 240 mv_rtc_detach(device_t dev) 241 { 242 struct mv_rtc_softc *sc; 243 244 sc = device_get_softc(dev); 245 246 mtx_destroy(&sc->mutex); 247 248 bus_release_resources(dev, res_spec, sc->res); 249 250 return (0); 251 } 252 253 static int 254 mv_rtc_gettime(device_t dev, struct timespec *ts) 255 { 256 struct mv_rtc_softc *sc; 257 uint32_t val, val_check; 258 259 sc = device_get_softc(dev); 260 261 MV_RTC_LOCK(sc); 262 /* 263 * According to HW Errata, if more than one second is detected 264 * between two time reads, then at least one of the reads gave 265 * an invalid value. 266 */ 267 do { 268 val = mv_rtc_reg_read(sc, RTC_TIME); 269 DELAY(100); 270 val_check = mv_rtc_reg_read(sc, RTC_TIME); 271 } while ((val_check - val) > 1); 272 273 MV_RTC_UNLOCK(sc); 274 275 ts->tv_sec = val_check; 276 /* RTC resolution is 1 sec */ 277 ts->tv_nsec = 0; 278 279 return (0); 280 } 281 282 static int 283 mv_rtc_settime(device_t dev, struct timespec *ts) 284 { 285 struct mv_rtc_softc *sc; 286 287 sc = device_get_softc(dev); 288 289 /* RTC resolution is 1 sec */ 290 if (ts->tv_nsec >= HALF_OF_SEC_NS) 291 ts->tv_sec++; 292 ts->tv_nsec = 0; 293 294 MV_RTC_LOCK(sc); 295 296 if ((mv_rtc_reg_read(sc, RTC_CLOCK_CORR) & RTC_NOMINAL_TIMING_MASK) != 297 RTC_NOMINAL_TIMING) { 298 /* RTC was not resetted yet */ 299 mv_rtc_reset(dev); 300 } 301 302 /* 303 * According to errata FE-3124064, Write to RTC TIME register 304 * may fail. As a workaround, before writing to RTC TIME register, 305 * issue a dummy write of 0x0 twice to RTC Status register. 306 */ 307 mv_rtc_reg_write(sc, RTC_STATUS, 0x0); 308 mv_rtc_reg_write(sc, RTC_STATUS, 0x0); 309 mv_rtc_reg_write(sc, RTC_TIME, ts->tv_sec); 310 MV_RTC_UNLOCK(sc); 311 312 return (0); 313 } 314 315 static inline uint32_t 316 mv_rtc_reg_read(struct mv_rtc_softc *sc, bus_size_t off) 317 { 318 319 return (bus_read_4(sc->res[RTC_RES], off)); 320 } 321 322 /* 323 * According to the datasheet, the OS should wait 5us after every 324 * register write to the RTC hard macro so that the required update 325 * can occur without holding off the system bus 326 */ 327 static inline int 328 mv_rtc_reg_write(struct mv_rtc_softc *sc, bus_size_t off, uint32_t val) 329 { 330 331 bus_write_4(sc->res[RTC_RES], off, val); 332 DELAY(5); 333 334 return (0); 335 } 336 337 static inline void 338 mv_rtc_configure_bus_a38x(struct mv_rtc_softc *sc) 339 { 340 int val; 341 342 val = bus_read_4(sc->res[RTC_SOC_RES], A38X_RTC_BRIDGE_TIMING_CTRL); 343 val &= ~(A38X_RTC_WRCLK_PERIOD_MASK | A38X_RTC_READ_OUTPUT_DELAY_MASK); 344 val |= A38X_RTC_WRCLK_PERIOD_MAX << A38X_RTC_WRCLK_PERIOD_SHIFT; 345 val |= A38X_RTC_READ_OUTPUT_DELAY_MAX << A38X_RTC_READ_OUTPUT_DELAY_SHIFT; 346 bus_write_4(sc->res[RTC_SOC_RES], A38X_RTC_BRIDGE_TIMING_CTRL, val); 347 } 348 349 static inline void 350 mv_rtc_configure_bus_a8k(struct mv_rtc_softc *sc) 351 { 352 int val; 353 354 val = bus_read_4(sc->res[RTC_SOC_RES], A8K_RTC_BRIDGE_TIMING_CTRL0); 355 val &= ~(A8K_RTC_WRCLK_PERIOD_MASK | A8K_RTC_WRCLK_SETUP_MASK); 356 val |= A8K_RTC_WRCLK_PERIOD_VAL << A8K_RTC_WRCLK_PERIOD_SHIFT; 357 val |= A8K_RTC_WRCLK_SETUP_VAL << A8K_RTC_WRCLK_SETUP_SHIFT; 358 bus_write_4(sc->res[RTC_SOC_RES], A8K_RTC_BRIDGE_TIMING_CTRL1, val); 359 360 val = bus_read_4(sc->res[RTC_SOC_RES], A8K_RTC_BRIDGE_TIMING_CTRL0); 361 val &= ~A8K_RTC_READ_OUTPUT_DELAY_MASK; 362 val |= A8K_RTC_READ_OUTPUT_DELAY_VAL << A8K_RTC_READ_OUTPUT_DELAY_SHIFT; 363 bus_write_4(sc->res[RTC_SOC_RES], A8K_RTC_BRIDGE_TIMING_CTRL1, val); 364 }
Cache object: ad38c30ddc8334a7d78eb2c0fd78e763
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