1 /*- 2 * Copyright (c) 2012 Ganbold Tsagaankhuu <ganbold@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/malloc.h> 36 #include <sys/rman.h> 37 #include <sys/timeet.h> 38 #include <sys/timetc.h> 39 #include <sys/watchdog.h> 40 #include <machine/bus.h> 41 #include <machine/intr.h> 42 #include <machine/machdep.h> 43 44 #include <dev/ofw/openfirm.h> 45 #include <dev/ofw/ofw_bus.h> 46 #include <dev/ofw/ofw_bus_subr.h> 47 48 #include <dev/extres/clk/clk.h> 49 50 #if defined(__aarch64__) 51 #include "opt_soc.h" 52 #else 53 #include <arm/allwinner/aw_machdep.h> 54 #endif 55 56 /** 57 * Timer registers addr 58 * 59 */ 60 #define TIMER_IRQ_EN_REG 0x00 61 #define TIMER_IRQ_ENABLE(x) (1 << x) 62 63 #define TIMER_IRQ_STA_REG 0x04 64 #define TIMER_IRQ_PENDING(x) (1 << x) 65 66 /* 67 * On A10, A13, A20 and A31/A31s 6 timers are available 68 */ 69 #define TIMER_CTRL_REG(x) (0x10 + 0x10 * x) 70 #define TIMER_CTRL_START (1 << 0) 71 #define TIMER_CTRL_AUTORELOAD (1 << 1) 72 #define TIMER_CTRL_CLKSRC_MASK (3 << 2) 73 #define TIMER_CTRL_OSC24M (1 << 2) 74 #define TIMER_CTRL_PRESCALAR_MASK (0x7 << 4) 75 #define TIMER_CTRL_PRESCALAR(x) ((x - 1) << 4) 76 #define TIMER_CTRL_MODE_MASK (1 << 7) 77 #define TIMER_CTRL_MODE_SINGLE (1 << 7) 78 #define TIMER_CTRL_MODE_CONTINUOUS (0 << 7) 79 #define TIMER_INTV_REG(x) (0x14 + 0x10 * x) 80 #define TIMER_CURV_REG(x) (0x18 + 0x10 * x) 81 82 /* 64 bit counter, available in A10 and A13 */ 83 #define CNT64_CTRL_REG 0xa0 84 #define CNT64_CTRL_RL_EN 0x02 /* read latch enable */ 85 #define CNT64_LO_REG 0xa4 86 #define CNT64_HI_REG 0xa8 87 88 #define SYS_TIMER_CLKSRC 24000000 /* clock source */ 89 90 enum a10_timer_type { 91 A10_TIMER = 1, 92 A23_TIMER, 93 }; 94 95 struct a10_timer_softc { 96 device_t sc_dev; 97 struct resource *res[2]; 98 void *sc_ih; /* interrupt handler */ 99 uint32_t sc_period; 100 uint64_t timer0_freq; 101 struct eventtimer et; 102 enum a10_timer_type type; 103 }; 104 105 #define timer_read_4(sc, reg) \ 106 bus_read_4(sc->res[A10_TIMER_MEMRES], reg) 107 #define timer_write_4(sc, reg, val) \ 108 bus_write_4(sc->res[A10_TIMER_MEMRES], reg, val) 109 110 static u_int a10_timer_get_timecount(struct timecounter *); 111 #if defined(__arm__) 112 static int a10_timer_timer_start(struct eventtimer *, 113 sbintime_t first, sbintime_t period); 114 static int a10_timer_timer_stop(struct eventtimer *); 115 #endif 116 117 static uint64_t timer_read_counter64(struct a10_timer_softc *sc); 118 #if defined(__arm__) 119 static void a10_timer_eventtimer_setup(struct a10_timer_softc *sc); 120 #endif 121 122 #if defined(__aarch64__) 123 static void a23_timer_timecounter_setup(struct a10_timer_softc *sc); 124 static u_int a23_timer_get_timecount(struct timecounter *tc); 125 #endif 126 127 static int a10_timer_irq(void *); 128 static int a10_timer_probe(device_t); 129 static int a10_timer_attach(device_t); 130 131 #if defined(__arm__) 132 static delay_func a10_timer_delay; 133 #endif 134 135 static struct timecounter a10_timer_timecounter = { 136 .tc_name = "a10_timer timer0", 137 .tc_get_timecount = a10_timer_get_timecount, 138 .tc_counter_mask = ~0u, 139 .tc_frequency = 0, 140 .tc_quality = 1000, 141 }; 142 143 #if defined(__aarch64__) 144 static struct timecounter a23_timer_timecounter = { 145 .tc_name = "a10_timer timer0", 146 .tc_get_timecount = a23_timer_get_timecount, 147 .tc_counter_mask = ~0u, 148 .tc_frequency = 0, 149 /* We want it to be selected over the arm generic timecounter */ 150 .tc_quality = 2000, 151 }; 152 #endif 153 154 #define A10_TIMER_MEMRES 0 155 #define A10_TIMER_IRQRES 1 156 157 static struct resource_spec a10_timer_spec[] = { 158 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 159 { SYS_RES_IRQ, 0, RF_ACTIVE }, 160 { -1, 0 } 161 }; 162 163 static struct ofw_compat_data compat_data[] = { 164 {"allwinner,sun4i-a10-timer", A10_TIMER}, 165 #if defined(__aarch64__) 166 {"allwinner,sun8i-a23-timer", A23_TIMER}, 167 #endif 168 {NULL, 0}, 169 }; 170 171 static int 172 a10_timer_probe(device_t dev) 173 { 174 #if defined(__arm__) 175 u_int soc_family; 176 #endif 177 178 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 179 return (ENXIO); 180 181 #if defined(__arm__) 182 /* For SoC >= A10 we have the ARM Timecounter/Eventtimer */ 183 soc_family = allwinner_soc_family(); 184 if (soc_family != ALLWINNERSOC_SUN4I && 185 soc_family != ALLWINNERSOC_SUN5I) 186 return (ENXIO); 187 #endif 188 189 device_set_desc(dev, "Allwinner timer"); 190 return (BUS_PROBE_DEFAULT); 191 } 192 193 static int 194 a10_timer_attach(device_t dev) 195 { 196 struct a10_timer_softc *sc; 197 clk_t clk; 198 int err; 199 200 sc = device_get_softc(dev); 201 sc->type = ofw_bus_search_compatible(dev, compat_data)->ocd_data; 202 203 if (bus_alloc_resources(dev, a10_timer_spec, sc->res)) { 204 device_printf(dev, "could not allocate resources\n"); 205 return (ENXIO); 206 } 207 208 sc->sc_dev = dev; 209 210 /* Setup and enable the timer interrupt */ 211 err = bus_setup_intr(dev, sc->res[A10_TIMER_IRQRES], INTR_TYPE_CLK, 212 a10_timer_irq, NULL, sc, &sc->sc_ih); 213 if (err != 0) { 214 bus_release_resources(dev, a10_timer_spec, sc->res); 215 device_printf(dev, "Unable to setup the clock irq handler, " 216 "err = %d\n", err); 217 return (ENXIO); 218 } 219 220 if (clk_get_by_ofw_index(dev, 0, 0, &clk) != 0) 221 sc->timer0_freq = SYS_TIMER_CLKSRC; 222 else { 223 if (clk_get_freq(clk, &sc->timer0_freq) != 0) { 224 device_printf(dev, "Cannot get clock source frequency\n"); 225 return (ENXIO); 226 } 227 } 228 229 #if defined(__arm__) 230 a10_timer_eventtimer_setup(sc); 231 arm_set_delay(a10_timer_delay, sc); 232 a10_timer_timecounter.tc_priv = sc; 233 a10_timer_timecounter.tc_frequency = sc->timer0_freq; 234 tc_init(&a10_timer_timecounter); 235 #elif defined(__aarch64__) 236 a23_timer_timecounter_setup(sc); 237 #endif 238 239 if (bootverbose) { 240 device_printf(sc->sc_dev, "clock: hz=%d stathz = %d\n", hz, stathz); 241 242 device_printf(sc->sc_dev, "event timer clock frequency %ju\n", 243 sc->timer0_freq); 244 device_printf(sc->sc_dev, "timecounter clock frequency %jd\n", 245 a10_timer_timecounter.tc_frequency); 246 } 247 248 return (0); 249 } 250 251 static int 252 a10_timer_irq(void *arg) 253 { 254 struct a10_timer_softc *sc; 255 uint32_t val; 256 257 sc = (struct a10_timer_softc *)arg; 258 259 /* Clear interrupt pending bit. */ 260 timer_write_4(sc, TIMER_IRQ_STA_REG, TIMER_IRQ_PENDING(0)); 261 262 val = timer_read_4(sc, TIMER_CTRL_REG(0)); 263 264 /* 265 * Disabled autoreload and sc_period > 0 means 266 * timer_start was called with non NULL first value. 267 * Now we will set periodic timer with the given period 268 * value. 269 */ 270 if ((val & (1<<1)) == 0 && sc->sc_period > 0) { 271 /* Update timer */ 272 timer_write_4(sc, TIMER_CURV_REG(0), sc->sc_period); 273 274 /* Make periodic and enable */ 275 val |= TIMER_CTRL_AUTORELOAD | TIMER_CTRL_START; 276 timer_write_4(sc, TIMER_CTRL_REG(0), val); 277 } 278 279 if (sc->et.et_active) 280 sc->et.et_event_cb(&sc->et, sc->et.et_arg); 281 282 return (FILTER_HANDLED); 283 } 284 285 /* 286 * Event timer function for A10 and A13 287 */ 288 289 #if defined(__arm__) 290 static void 291 a10_timer_eventtimer_setup(struct a10_timer_softc *sc) 292 { 293 uint32_t val; 294 295 /* Set clock source to OSC24M, 1 pre-division, continuous mode */ 296 val = timer_read_4(sc, TIMER_CTRL_REG(0)); 297 val &= ~TIMER_CTRL_PRESCALAR_MASK | ~TIMER_CTRL_MODE_MASK | ~TIMER_CTRL_CLKSRC_MASK; 298 val |= TIMER_CTRL_PRESCALAR(1) | TIMER_CTRL_OSC24M; 299 timer_write_4(sc, TIMER_CTRL_REG(0), val); 300 301 /* Enable timer0 */ 302 val = timer_read_4(sc, TIMER_IRQ_EN_REG); 303 val |= TIMER_IRQ_ENABLE(0); 304 timer_write_4(sc, TIMER_IRQ_EN_REG, val); 305 306 /* Set desired frequency in event timer and timecounter */ 307 sc->et.et_frequency = sc->timer0_freq; 308 sc->et.et_name = "a10_timer Eventtimer"; 309 sc->et.et_flags = ET_FLAGS_ONESHOT | ET_FLAGS_PERIODIC; 310 sc->et.et_quality = 1000; 311 sc->et.et_min_period = (0x00000005LLU << 32) / sc->et.et_frequency; 312 sc->et.et_max_period = (0xfffffffeLLU << 32) / sc->et.et_frequency; 313 sc->et.et_start = a10_timer_timer_start; 314 sc->et.et_stop = a10_timer_timer_stop; 315 sc->et.et_priv = sc; 316 et_register(&sc->et); 317 } 318 319 static int 320 a10_timer_timer_start(struct eventtimer *et, sbintime_t first, 321 sbintime_t period) 322 { 323 struct a10_timer_softc *sc; 324 uint32_t count; 325 uint32_t val; 326 327 sc = (struct a10_timer_softc *)et->et_priv; 328 329 if (period != 0) 330 sc->sc_period = ((uint32_t)et->et_frequency * period) >> 32; 331 else 332 sc->sc_period = 0; 333 if (first != 0) 334 count = ((uint32_t)et->et_frequency * first) >> 32; 335 else 336 count = sc->sc_period; 337 338 /* Update timer values */ 339 timer_write_4(sc, TIMER_INTV_REG(0), sc->sc_period); 340 timer_write_4(sc, TIMER_CURV_REG(0), count); 341 342 val = timer_read_4(sc, TIMER_CTRL_REG(0)); 343 if (period != 0) { 344 /* periodic */ 345 val |= TIMER_CTRL_AUTORELOAD; 346 } else { 347 /* oneshot */ 348 val &= ~TIMER_CTRL_AUTORELOAD; 349 } 350 /* Enable timer0 */ 351 val |= TIMER_IRQ_ENABLE(0); 352 timer_write_4(sc, TIMER_CTRL_REG(0), val); 353 354 return (0); 355 } 356 357 static int 358 a10_timer_timer_stop(struct eventtimer *et) 359 { 360 struct a10_timer_softc *sc; 361 uint32_t val; 362 363 sc = (struct a10_timer_softc *)et->et_priv; 364 365 /* Disable timer0 */ 366 val = timer_read_4(sc, TIMER_CTRL_REG(0)); 367 val &= ~TIMER_CTRL_START; 368 timer_write_4(sc, TIMER_CTRL_REG(0), val); 369 370 sc->sc_period = 0; 371 372 return (0); 373 } 374 #endif 375 376 /* 377 * Timecounter functions for A23 and above 378 */ 379 380 #if defined(__aarch64__) 381 static void 382 a23_timer_timecounter_setup(struct a10_timer_softc *sc) 383 { 384 uint32_t val; 385 386 /* Set clock source to OSC24M, 1 pre-division, continuous mode */ 387 val = timer_read_4(sc, TIMER_CTRL_REG(0)); 388 val &= ~TIMER_CTRL_PRESCALAR_MASK | ~TIMER_CTRL_MODE_MASK | ~TIMER_CTRL_CLKSRC_MASK; 389 val |= TIMER_CTRL_PRESCALAR(1) | TIMER_CTRL_OSC24M; 390 timer_write_4(sc, TIMER_CTRL_REG(0), val); 391 392 /* Set reload value */ 393 timer_write_4(sc, TIMER_INTV_REG(0), ~0); 394 val = timer_read_4(sc, TIMER_INTV_REG(0)); 395 396 /* Enable timer0 */ 397 val = timer_read_4(sc, TIMER_CTRL_REG(0)); 398 val |= TIMER_CTRL_AUTORELOAD | TIMER_CTRL_START; 399 timer_write_4(sc, TIMER_CTRL_REG(0), val); 400 401 val = timer_read_4(sc, TIMER_CURV_REG(0)); 402 403 a23_timer_timecounter.tc_priv = sc; 404 a23_timer_timecounter.tc_frequency = sc->timer0_freq; 405 tc_init(&a23_timer_timecounter); 406 } 407 408 static u_int 409 a23_timer_get_timecount(struct timecounter *tc) 410 { 411 struct a10_timer_softc *sc; 412 uint32_t val; 413 414 sc = (struct a10_timer_softc *)tc->tc_priv; 415 if (sc == NULL) 416 return (0); 417 418 val = timer_read_4(sc, TIMER_CURV_REG(0)); 419 /* Counter count backwards */ 420 return (~0u - val); 421 } 422 #endif 423 424 /* 425 * Timecounter functions for A10 and A13, using the 64 bits counter 426 */ 427 428 static uint64_t 429 timer_read_counter64(struct a10_timer_softc *sc) 430 { 431 uint32_t lo, hi; 432 433 /* Latch counter, wait for it to be ready to read. */ 434 timer_write_4(sc, CNT64_CTRL_REG, CNT64_CTRL_RL_EN); 435 while (timer_read_4(sc, CNT64_CTRL_REG) & CNT64_CTRL_RL_EN) 436 continue; 437 438 hi = timer_read_4(sc, CNT64_HI_REG); 439 lo = timer_read_4(sc, CNT64_LO_REG); 440 441 return (((uint64_t)hi << 32) | lo); 442 } 443 444 #if defined(__arm__) 445 static void 446 a10_timer_delay(int usec, void *arg) 447 { 448 struct a10_timer_softc *sc = arg; 449 uint64_t end, now; 450 451 now = timer_read_counter64(sc); 452 end = now + (sc->timer0_freq / 1000000) * (usec + 1); 453 454 while (now < end) 455 now = timer_read_counter64(sc); 456 } 457 #endif 458 459 static u_int 460 a10_timer_get_timecount(struct timecounter *tc) 461 { 462 463 if (tc->tc_priv == NULL) 464 return (0); 465 466 return ((u_int)timer_read_counter64(tc->tc_priv)); 467 } 468 469 static device_method_t a10_timer_methods[] = { 470 DEVMETHOD(device_probe, a10_timer_probe), 471 DEVMETHOD(device_attach, a10_timer_attach), 472 473 DEVMETHOD_END 474 }; 475 476 static driver_t a10_timer_driver = { 477 "a10_timer", 478 a10_timer_methods, 479 sizeof(struct a10_timer_softc), 480 }; 481 482 EARLY_DRIVER_MODULE(a10_timer, simplebus, a10_timer_driver, 0, 0, 483 BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE); 484