1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2006 Benno Rice. 5 * Copyright (C) 2007-2008 MARVELL INTERNATIONAL LTD. 6 * All rights reserved. 7 * 8 * Adapted to Marvell SoC by Semihalf. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * from: FreeBSD: //depot/projects/arm/src/sys/arm/xscale/pxa2x0/pxa2x0_timer.c, rev 1 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/malloc.h> 42 #include <sys/rman.h> 43 #include <sys/timeet.h> 44 #include <sys/timetc.h> 45 #include <sys/watchdog.h> 46 #include <machine/bus.h> 47 #include <machine/cpu.h> 48 #include <machine/intr.h> 49 50 #include <arm/mv/mvreg.h> 51 #include <arm/mv/mvvar.h> 52 53 #include <dev/ofw/ofw_bus.h> 54 #include <dev/ofw/ofw_bus_subr.h> 55 56 #define INITIAL_TIMECOUNTER (0xffffffff) 57 #define MAX_WATCHDOG_TICKS (0xffffffff) 58 59 #define MV_TMR 0x1 60 #define MV_WDT 0x2 61 #define MV_NONE 0x0 62 63 #if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) 64 #define MV_CLOCK_SRC 25000000 /* Timers' 25MHz mode */ 65 #else 66 #define MV_CLOCK_SRC get_tclk() 67 #endif 68 69 #if defined(SOC_MV_ARMADA38X) 70 #define WATCHDOG_TIMER 4 71 #else 72 #define WATCHDOG_TIMER 2 73 #endif 74 75 struct mv_timer_softc { 76 struct resource * timer_res[2]; 77 bus_space_tag_t timer_bst; 78 bus_space_handle_t timer_bsh; 79 struct mtx timer_mtx; 80 struct eventtimer et; 81 boolean_t has_wdt; 82 }; 83 84 static struct resource_spec mv_timer_spec[] = { 85 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 86 { SYS_RES_IRQ, 0, RF_ACTIVE | RF_OPTIONAL }, 87 { -1, 0 } 88 }; 89 90 /* Interrupt is not required by MV_WDT devices */ 91 static struct ofw_compat_data mv_timer_compat[] = { 92 {"mrvl,timer", MV_TMR | MV_WDT }, 93 {"marvell,armada-380-wdt", MV_WDT }, 94 {NULL, MV_NONE } 95 }; 96 97 static struct mv_timer_softc *timer_softc = NULL; 98 static int timers_initialized = 0; 99 100 static int mv_timer_probe(device_t); 101 static int mv_timer_attach(device_t); 102 103 static int mv_hardclock(void *); 104 static unsigned mv_timer_get_timecount(struct timecounter *); 105 106 static uint32_t mv_get_timer_control(void); 107 static void mv_set_timer_control(uint32_t); 108 static uint32_t mv_get_timer(uint32_t); 109 static void mv_set_timer(uint32_t, uint32_t); 110 static void mv_set_timer_rel(uint32_t, uint32_t); 111 static void mv_watchdog_enable(void); 112 static void mv_watchdog_disable(void); 113 static void mv_watchdog_event(void *, unsigned int, int *); 114 static int mv_timer_start(struct eventtimer *et, 115 sbintime_t first, sbintime_t period); 116 static int mv_timer_stop(struct eventtimer *et); 117 static void mv_setup_timers(void); 118 119 static struct timecounter mv_timer_timecounter = { 120 .tc_get_timecount = mv_timer_get_timecount, 121 .tc_name = "CPUTimer1", 122 .tc_frequency = 0, /* This is assigned on the fly in the init sequence */ 123 .tc_counter_mask = ~0u, 124 .tc_quality = 1000, 125 }; 126 127 static int 128 mv_timer_probe(device_t dev) 129 { 130 131 if (!ofw_bus_status_okay(dev)) 132 return (ENXIO); 133 134 if (ofw_bus_search_compatible(dev, mv_timer_compat)->ocd_data == MV_NONE) 135 return (ENXIO); 136 137 device_set_desc(dev, "Marvell CPU Timer"); 138 return (0); 139 } 140 141 static int 142 mv_timer_attach(device_t dev) 143 { 144 int error; 145 void *ihl; 146 struct mv_timer_softc *sc; 147 #if !defined(SOC_MV_ARMADAXP) && !defined(SOC_MV_ARMADA38X) 148 uint32_t irq_cause, irq_mask; 149 #endif 150 151 if (timer_softc != NULL) 152 return (ENXIO); 153 154 sc = (struct mv_timer_softc *)device_get_softc(dev); 155 timer_softc = sc; 156 157 error = bus_alloc_resources(dev, mv_timer_spec, sc->timer_res); 158 if (error) { 159 device_printf(dev, "could not allocate resources\n"); 160 return (ENXIO); 161 } 162 163 sc->timer_bst = rman_get_bustag(sc->timer_res[0]); 164 sc->timer_bsh = rman_get_bushandle(sc->timer_res[0]); 165 166 sc->has_wdt = ofw_bus_has_prop(dev, "mrvl,has-wdt") || 167 ofw_bus_is_compatible(dev, "marvell,armada-380-wdt"); 168 169 mtx_init(&timer_softc->timer_mtx, "watchdog", NULL, MTX_DEF); 170 171 if (sc->has_wdt) { 172 mv_watchdog_disable(); 173 EVENTHANDLER_REGISTER(watchdog_list, mv_watchdog_event, sc, 0); 174 } 175 176 if (ofw_bus_search_compatible(dev, mv_timer_compat)->ocd_data 177 == MV_WDT) { 178 /* Don't set timers for wdt-only entry. */ 179 device_printf(dev, "only watchdog attached\n"); 180 return (0); 181 } else if (sc->timer_res[1] == NULL) { 182 device_printf(dev, "no interrupt resource\n"); 183 bus_release_resources(dev, mv_timer_spec, sc->timer_res); 184 return (ENXIO); 185 } 186 187 if (bus_setup_intr(dev, sc->timer_res[1], INTR_TYPE_CLK, 188 mv_hardclock, NULL, sc, &ihl) != 0) { 189 bus_release_resources(dev, mv_timer_spec, sc->timer_res); 190 device_printf(dev, "Could not setup interrupt.\n"); 191 return (ENXIO); 192 } 193 194 mv_setup_timers(); 195 #if !defined(SOC_MV_ARMADAXP) && !defined(SOC_MV_ARMADA38X) 196 irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE); 197 irq_cause &= IRQ_TIMER0_CLR; 198 199 write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause); 200 irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK); 201 irq_mask |= IRQ_TIMER0_MASK; 202 irq_mask &= ~IRQ_TIMER1_MASK; 203 write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask); 204 #endif 205 sc->et.et_name = "CPUTimer0"; 206 sc->et.et_flags = ET_FLAGS_PERIODIC | ET_FLAGS_ONESHOT; 207 sc->et.et_quality = 1000; 208 209 sc->et.et_frequency = MV_CLOCK_SRC; 210 sc->et.et_min_period = (0x00000002LLU << 32) / sc->et.et_frequency; 211 sc->et.et_max_period = (0xfffffffeLLU << 32) / sc->et.et_frequency; 212 sc->et.et_start = mv_timer_start; 213 sc->et.et_stop = mv_timer_stop; 214 sc->et.et_priv = sc; 215 et_register(&sc->et); 216 mv_timer_timecounter.tc_frequency = MV_CLOCK_SRC; 217 tc_init(&mv_timer_timecounter); 218 219 return (0); 220 } 221 222 static int 223 mv_hardclock(void *arg) 224 { 225 struct mv_timer_softc *sc; 226 uint32_t irq_cause; 227 228 irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE); 229 irq_cause &= IRQ_TIMER0_CLR; 230 write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause); 231 232 sc = (struct mv_timer_softc *)arg; 233 if (sc->et.et_active) 234 sc->et.et_event_cb(&sc->et, sc->et.et_arg); 235 236 return (FILTER_HANDLED); 237 } 238 239 static device_method_t mv_timer_methods[] = { 240 DEVMETHOD(device_probe, mv_timer_probe), 241 DEVMETHOD(device_attach, mv_timer_attach), 242 243 { 0, 0 } 244 }; 245 246 static driver_t mv_timer_driver = { 247 "timer", 248 mv_timer_methods, 249 sizeof(struct mv_timer_softc), 250 }; 251 252 static devclass_t mv_timer_devclass; 253 254 DRIVER_MODULE(timer, simplebus, mv_timer_driver, mv_timer_devclass, 0, 0); 255 256 static unsigned 257 mv_timer_get_timecount(struct timecounter *tc) 258 { 259 260 return (INITIAL_TIMECOUNTER - mv_get_timer(1)); 261 } 262 263 void 264 DELAY(int usec) 265 { 266 uint32_t val, val_temp; 267 int32_t nticks; 268 269 if (!timers_initialized) { 270 for (; usec > 0; usec--) 271 for (val = 100; val > 0; val--) 272 __asm __volatile("nop" ::: "memory"); 273 return; 274 } 275 TSENTER(); 276 277 val = mv_get_timer(1); 278 nticks = ((MV_CLOCK_SRC / 1000000 + 1) * usec); 279 280 while (nticks > 0) { 281 val_temp = mv_get_timer(1); 282 if (val > val_temp) 283 nticks -= (val - val_temp); 284 else 285 nticks -= (val + (INITIAL_TIMECOUNTER - val_temp)); 286 287 val = val_temp; 288 } 289 TSEXIT(); 290 } 291 292 static uint32_t 293 mv_get_timer_control(void) 294 { 295 296 return (bus_space_read_4(timer_softc->timer_bst, 297 timer_softc->timer_bsh, CPU_TIMER_CONTROL)); 298 } 299 300 static void 301 mv_set_timer_control(uint32_t val) 302 { 303 304 bus_space_write_4(timer_softc->timer_bst, 305 timer_softc->timer_bsh, CPU_TIMER_CONTROL, val); 306 } 307 308 static uint32_t 309 mv_get_timer(uint32_t timer) 310 { 311 312 return (bus_space_read_4(timer_softc->timer_bst, 313 timer_softc->timer_bsh, CPU_TIMER0 + timer * 0x8)); 314 } 315 316 static void 317 mv_set_timer(uint32_t timer, uint32_t val) 318 { 319 320 bus_space_write_4(timer_softc->timer_bst, 321 timer_softc->timer_bsh, CPU_TIMER0 + timer * 0x8, val); 322 } 323 324 static void 325 mv_set_timer_rel(uint32_t timer, uint32_t val) 326 { 327 328 bus_space_write_4(timer_softc->timer_bst, 329 timer_softc->timer_bsh, CPU_TIMER0_REL + timer * 0x8, val); 330 } 331 332 static void 333 mv_watchdog_enable(void) 334 { 335 uint32_t val, irq_cause; 336 #if !defined(SOC_MV_ARMADAXP) && !defined(SOC_MV_ARMADA38X) 337 uint32_t irq_mask; 338 #endif 339 340 irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE); 341 irq_cause &= IRQ_TIMER_WD_CLR; 342 write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause); 343 344 #if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) 345 val = read_cpu_mp_clocks(WD_RSTOUTn_MASK); 346 val |= (WD_GLOBAL_MASK | WD_CPU0_MASK); 347 write_cpu_mp_clocks(WD_RSTOUTn_MASK, val); 348 349 val = read_cpu_misc(RSTOUTn_MASK); 350 val &= ~RSTOUTn_MASK_WD; 351 write_cpu_misc(RSTOUTn_MASK, val); 352 #else 353 irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK); 354 irq_mask |= IRQ_TIMER_WD_MASK; 355 write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask); 356 357 val = read_cpu_ctrl(RSTOUTn_MASK); 358 val |= WD_RST_OUT_EN; 359 write_cpu_ctrl(RSTOUTn_MASK, val); 360 #endif 361 362 val = mv_get_timer_control(); 363 #if defined(SOC_MV_ARMADA38X) 364 val |= CPU_TIMER_WD_EN | CPU_TIMER_WD_AUTO | CPU_TIMER_WD_25MHZ_EN; 365 #elif defined(SOC_MV_ARMADAXP) 366 val |= CPU_TIMER2_EN | CPU_TIMER2_AUTO | CPU_TIMER_WD_25MHZ_EN; 367 #else 368 val |= CPU_TIMER2_EN | CPU_TIMER2_AUTO; 369 #endif 370 mv_set_timer_control(val); 371 } 372 373 static void 374 mv_watchdog_disable(void) 375 { 376 uint32_t val, irq_cause; 377 #if !defined(SOC_MV_ARMADAXP) && !defined(SOC_MV_ARMADA38X) 378 uint32_t irq_mask; 379 #endif 380 381 val = mv_get_timer_control(); 382 #if defined(SOC_MV_ARMADA38X) 383 val &= ~(CPU_TIMER_WD_EN | CPU_TIMER_WD_AUTO); 384 #else 385 val &= ~(CPU_TIMER2_EN | CPU_TIMER2_AUTO); 386 #endif 387 mv_set_timer_control(val); 388 389 #if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) 390 val = read_cpu_mp_clocks(WD_RSTOUTn_MASK); 391 val &= ~(WD_GLOBAL_MASK | WD_CPU0_MASK); 392 write_cpu_mp_clocks(WD_RSTOUTn_MASK, val); 393 394 val = read_cpu_misc(RSTOUTn_MASK); 395 val |= RSTOUTn_MASK_WD; 396 write_cpu_misc(RSTOUTn_MASK, RSTOUTn_MASK_WD); 397 #else 398 val = read_cpu_ctrl(RSTOUTn_MASK); 399 val &= ~WD_RST_OUT_EN; 400 write_cpu_ctrl(RSTOUTn_MASK, val); 401 402 irq_mask = read_cpu_ctrl(BRIDGE_IRQ_MASK); 403 irq_mask &= ~(IRQ_TIMER_WD_MASK); 404 write_cpu_ctrl(BRIDGE_IRQ_MASK, irq_mask); 405 #endif 406 407 irq_cause = read_cpu_ctrl(BRIDGE_IRQ_CAUSE); 408 irq_cause &= IRQ_TIMER_WD_CLR; 409 write_cpu_ctrl(BRIDGE_IRQ_CAUSE, irq_cause); 410 } 411 412 413 /* 414 * Watchdog event handler. 415 */ 416 static void 417 mv_watchdog_event(void *arg, unsigned int cmd, int *error) 418 { 419 uint64_t ns; 420 uint64_t ticks; 421 422 mtx_lock(&timer_softc->timer_mtx); 423 if (cmd == 0) 424 mv_watchdog_disable(); 425 else { 426 /* 427 * Watchdog timeout is in nanosecs, calculation according to 428 * watchdog(9) 429 */ 430 ns = (uint64_t)1 << (cmd & WD_INTERVAL); 431 ticks = (uint64_t)(ns * MV_CLOCK_SRC) / 1000000000; 432 if (ticks > MAX_WATCHDOG_TICKS) 433 mv_watchdog_disable(); 434 else { 435 mv_set_timer(WATCHDOG_TIMER, ticks); 436 mv_watchdog_enable(); 437 *error = 0; 438 } 439 } 440 mtx_unlock(&timer_softc->timer_mtx); 441 } 442 443 static int 444 mv_timer_start(struct eventtimer *et, sbintime_t first, sbintime_t period) 445 { 446 struct mv_timer_softc *sc; 447 uint32_t val, val1; 448 449 /* Calculate dividers. */ 450 sc = (struct mv_timer_softc *)et->et_priv; 451 if (period != 0) 452 val = ((uint32_t)sc->et.et_frequency * period) >> 32; 453 else 454 val = 0; 455 if (first != 0) 456 val1 = ((uint32_t)sc->et.et_frequency * first) >> 32; 457 else 458 val1 = val; 459 460 /* Apply configuration. */ 461 mv_set_timer_rel(0, val); 462 mv_set_timer(0, val1); 463 val = mv_get_timer_control(); 464 val |= CPU_TIMER0_EN; 465 if (period != 0) 466 val |= CPU_TIMER0_AUTO; 467 else 468 val &= ~CPU_TIMER0_AUTO; 469 mv_set_timer_control(val); 470 return (0); 471 } 472 473 static int 474 mv_timer_stop(struct eventtimer *et) 475 { 476 uint32_t val; 477 478 val = mv_get_timer_control(); 479 val &= ~(CPU_TIMER0_EN | CPU_TIMER0_AUTO); 480 mv_set_timer_control(val); 481 return (0); 482 } 483 484 static void 485 mv_setup_timers(void) 486 { 487 uint32_t val; 488 489 mv_set_timer_rel(1, INITIAL_TIMECOUNTER); 490 mv_set_timer(1, INITIAL_TIMECOUNTER); 491 val = mv_get_timer_control(); 492 val &= ~(CPU_TIMER0_EN | CPU_TIMER0_AUTO); 493 val |= CPU_TIMER1_EN | CPU_TIMER1_AUTO; 494 #if defined(SOC_MV_ARMADAXP) || defined(SOC_MV_ARMADA38X) 495 /* Enable 25MHz mode */ 496 val |= CPU_TIMER0_25MHZ_EN | CPU_TIMER1_25MHZ_EN; 497 #endif 498 mv_set_timer_control(val); 499 timers_initialized = 1; 500 } 501