1 /*- 2 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org> 3 * Copyright (c) 2014 Steven Lawrance <stl@koffein.net> 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 /* 32 * Analog PLL and power regulator driver for Freescale i.MX6 family of SoCs. 33 * Also, temperature montoring and cpu frequency control. It was Freescale who 34 * kitchen-sinked this device, not us. :) 35 * 36 * We don't really do anything with analog PLLs, but the registers for 37 * controlling them belong to the same block as the power regulator registers. 38 * Since the newbus hierarchy makes it hard for anyone other than us to get at 39 * them, we just export a couple public functions to allow the imx6 CCM clock 40 * driver to read and write those registers. 41 * 42 * We also don't do anything about power regulation yet, but when the need 43 * arises, this would be the place for that code to live. 44 * 45 * I have no idea where the "anatop" name comes from. It's in the standard DTS 46 * source describing i.MX6 SoCs, and in the linux and u-boot code which comes 47 * from Freescale, but it's not in the SoC manual. 48 * 49 * Note that temperature values throughout this code are handled in two types of 50 * units. Items with '_cnt' in the name use the hardware temperature count 51 * units (higher counts are lower temperatures). Items with '_val' in the name 52 * are deci-Celcius, which are converted to/from deci-Kelvins in the sysctl 53 * handlers (dK is the standard unit for temperature in sysctl). 54 */ 55 56 #include <sys/param.h> 57 #include <sys/systm.h> 58 #include <sys/callout.h> 59 #include <sys/kernel.h> 60 #include <sys/limits.h> 61 #include <sys/sysctl.h> 62 #include <sys/module.h> 63 #include <sys/bus.h> 64 #include <sys/rman.h> 65 66 #include <dev/ofw/ofw_bus.h> 67 #include <dev/ofw/ofw_bus_subr.h> 68 69 #include <machine/bus.h> 70 #include <machine/fdt.h> 71 72 #include <arm/arm/mpcore_timervar.h> 73 #include <arm/freescale/fsl_ocotpreg.h> 74 #include <arm/freescale/fsl_ocotpvar.h> 75 #include <arm/freescale/imx/imx6_anatopreg.h> 76 #include <arm/freescale/imx/imx6_anatopvar.h> 77 78 static SYSCTL_NODE(_hw, OID_AUTO, imx6, CTLFLAG_RW, NULL, "i.MX6 container"); 79 80 static struct resource_spec imx6_anatop_spec[] = { 81 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 82 { SYS_RES_IRQ, 0, RF_ACTIVE }, 83 { -1, 0 } 84 }; 85 #define MEMRES 0 86 #define IRQRES 1 87 88 struct imx6_anatop_softc { 89 device_t dev; 90 struct resource *res[2]; 91 uint32_t cpu_curmhz; 92 uint32_t cpu_curmv; 93 uint32_t cpu_minmhz; 94 uint32_t cpu_minmv; 95 uint32_t cpu_maxmhz; 96 uint32_t cpu_maxmv; 97 uint32_t cpu_maxmhz_hw; 98 boolean_t cpu_overclock_enable; 99 uint32_t refosc_mhz; 100 void *temp_intrhand; 101 uint32_t temp_high_val; 102 uint32_t temp_high_cnt; 103 uint32_t temp_last_cnt; 104 uint32_t temp_room_cnt; 105 struct callout temp_throttle_callout; 106 sbintime_t temp_throttle_delay; 107 uint32_t temp_throttle_reset_cnt; 108 uint32_t temp_throttle_trigger_cnt; 109 uint32_t temp_throttle_val; 110 }; 111 112 static struct imx6_anatop_softc *imx6_anatop_sc; 113 114 /* 115 * Table of "operating points". 116 * These are combinations of frequency and voltage blessed by Freescale. 117 */ 118 static struct oppt { 119 uint32_t mhz; 120 uint32_t mv; 121 } imx6_oppt_table[] = { 122 /* { 396, 925}, XXX: need functional ccm code for this speed */ 123 { 792, 1150}, 124 { 852, 1225}, 125 { 996, 1225}, 126 {1200, 1275}, 127 }; 128 129 /* 130 * Table of CPU max frequencies. This is used to translate the max frequency 131 * value (0-3) from the ocotp CFG3 register into a mhz value that can be looked 132 * up in the operating points table. 133 */ 134 static uint32_t imx6_ocotp_mhz_tab[] = {792, 852, 996, 1200}; 135 136 #define TZ_ZEROC 2732 /* deci-Kelvin <-> deci-Celcius offset. */ 137 138 uint32_t 139 imx6_anatop_read_4(bus_size_t offset) 140 { 141 142 KASSERT(imx6_anatop_sc != NULL, ("imx6_anatop_read_4 sc NULL")); 143 144 return (bus_read_4(imx6_anatop_sc->res[MEMRES], offset)); 145 } 146 147 void 148 imx6_anatop_write_4(bus_size_t offset, uint32_t value) 149 { 150 151 KASSERT(imx6_anatop_sc != NULL, ("imx6_anatop_write_4 sc NULL")); 152 153 bus_write_4(imx6_anatop_sc->res[MEMRES], offset, value); 154 } 155 156 static void 157 vdd_set(struct imx6_anatop_softc *sc, int mv) 158 { 159 int newtarg, oldtarg; 160 uint32_t delay, pmureg; 161 static boolean_t init_done = false; 162 163 /* 164 * The datasheet says VDD_PU and VDD_SOC must be equal, and VDD_ARM 165 * can't be more than 50mV above or 200mV below them. For now to keep 166 * things simple we set all three to the same value. 167 */ 168 169 pmureg = imx6_anatop_read_4(IMX6_ANALOG_PMU_REG_CORE); 170 oldtarg = pmureg & IMX6_ANALOG_PMU_REG0_TARG_MASK; 171 172 /* Convert mV to target value. Clamp target to valid range. */ 173 if (mv < 725) 174 newtarg = 0x00; 175 else if (mv > 1450) 176 newtarg = 0x1F; 177 else 178 newtarg = (mv - 700) / 25; 179 180 /* 181 * The first time through the 3 voltages might not be equal so use a 182 * long conservative delay. After that we need to delay 3uS for every 183 * 25mV step upward. No need to delay at all when lowering. 184 */ 185 if (init_done) { 186 if (newtarg == oldtarg) 187 return; 188 else if (newtarg > oldtarg) 189 delay = (newtarg - oldtarg) * 3; 190 else 191 delay = 0; 192 } else { 193 delay = 700 / 25 * 3; 194 init_done = true; 195 } 196 197 /* 198 * Make the change and wait for it to take effect. 199 */ 200 pmureg &= ~(IMX6_ANALOG_PMU_REG0_TARG_MASK | 201 IMX6_ANALOG_PMU_REG1_TARG_MASK | 202 IMX6_ANALOG_PMU_REG2_TARG_MASK); 203 204 pmureg |= newtarg << IMX6_ANALOG_PMU_REG0_TARG_SHIFT; 205 pmureg |= newtarg << IMX6_ANALOG_PMU_REG1_TARG_SHIFT; 206 pmureg |= newtarg << IMX6_ANALOG_PMU_REG2_TARG_SHIFT; 207 208 imx6_anatop_write_4(IMX6_ANALOG_PMU_REG_CORE, pmureg); 209 DELAY(delay); 210 sc->cpu_curmv = newtarg * 25 + 700; 211 } 212 213 static inline uint32_t 214 cpufreq_mhz_from_div(struct imx6_anatop_softc *sc, uint32_t div) 215 { 216 217 return (sc->refosc_mhz * (div / 2)); 218 } 219 220 static inline uint32_t 221 cpufreq_mhz_to_div(struct imx6_anatop_softc *sc, uint32_t cpu_mhz) 222 { 223 224 return (cpu_mhz / (sc->refosc_mhz / 2)); 225 } 226 227 static inline uint32_t 228 cpufreq_actual_mhz(struct imx6_anatop_softc *sc, uint32_t cpu_mhz) 229 { 230 231 return (cpufreq_mhz_from_div(sc, cpufreq_mhz_to_div(sc, cpu_mhz))); 232 } 233 234 static struct oppt * 235 cpufreq_nearest_oppt(struct imx6_anatop_softc *sc, uint32_t cpu_newmhz) 236 { 237 int d, diff, i, nearest; 238 239 if (cpu_newmhz > sc->cpu_maxmhz_hw && !sc->cpu_overclock_enable) 240 cpu_newmhz = sc->cpu_maxmhz_hw; 241 242 diff = INT_MAX; 243 nearest = 0; 244 for (i = 0; i < nitems(imx6_oppt_table); ++i) { 245 d = abs((int)cpu_newmhz - (int)imx6_oppt_table[i].mhz); 246 if (diff > d) { 247 diff = d; 248 nearest = i; 249 } 250 } 251 return (&imx6_oppt_table[nearest]); 252 } 253 254 static void 255 cpufreq_set_clock(struct imx6_anatop_softc * sc, struct oppt *op) 256 { 257 uint32_t timeout, wrk32; 258 259 /* If increasing the frequency, we must first increase the voltage. */ 260 if (op->mhz > sc->cpu_curmhz) { 261 vdd_set(sc, op->mv); 262 } 263 264 /* 265 * I can't find a documented procedure for changing the ARM PLL divisor, 266 * but some trial and error came up with this: 267 * - Set the bypass clock source to REF_CLK_24M (source #0). 268 * - Set the PLL into bypass mode; cpu should now be running at 24mhz. 269 * - Change the divisor. 270 * - Wait for the LOCK bit to come on; it takes ~50 loop iterations. 271 * - Turn off bypass mode; cpu should now be running at the new speed. 272 */ 273 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_ARM_CLR, 274 IMX6_ANALOG_CCM_PLL_ARM_CLK_SRC_MASK); 275 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_ARM_SET, 276 IMX6_ANALOG_CCM_PLL_ARM_BYPASS); 277 278 wrk32 = imx6_anatop_read_4(IMX6_ANALOG_CCM_PLL_ARM); 279 wrk32 &= ~IMX6_ANALOG_CCM_PLL_ARM_DIV_MASK; 280 wrk32 |= cpufreq_mhz_to_div(sc, op->mhz); 281 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_ARM, wrk32); 282 283 timeout = 10000; 284 while ((imx6_anatop_read_4(IMX6_ANALOG_CCM_PLL_ARM) & 285 IMX6_ANALOG_CCM_PLL_ARM_LOCK) == 0) 286 if (--timeout == 0) 287 panic("imx6_set_cpu_clock(): PLL never locked"); 288 289 imx6_anatop_write_4(IMX6_ANALOG_CCM_PLL_ARM_CLR, 290 IMX6_ANALOG_CCM_PLL_ARM_BYPASS); 291 292 /* If lowering the frequency, it is now safe to lower the voltage. */ 293 if (op->mhz < sc->cpu_curmhz) 294 vdd_set(sc, op->mv); 295 sc->cpu_curmhz = op->mhz; 296 297 /* Tell the mpcore timer that its frequency has changed. */ 298 arm_tmr_change_frequency( 299 cpufreq_actual_mhz(sc, sc->cpu_curmhz) * 1000000 / 2); 300 } 301 302 static int 303 cpufreq_sysctl_minmhz(SYSCTL_HANDLER_ARGS) 304 { 305 struct imx6_anatop_softc *sc; 306 struct oppt * op; 307 uint32_t temp; 308 int err; 309 310 sc = arg1; 311 312 temp = sc->cpu_minmhz; 313 err = sysctl_handle_int(oidp, &temp, 0, req); 314 if (err != 0 || req->newptr == NULL) 315 return (err); 316 317 op = cpufreq_nearest_oppt(sc, temp); 318 if (op->mhz > sc->cpu_maxmhz) 319 return (ERANGE); 320 else if (op->mhz == sc->cpu_minmhz) 321 return (0); 322 323 /* 324 * Value changed, update softc. If the new min is higher than the 325 * current speed, raise the current speed to match. 326 */ 327 sc->cpu_minmhz = op->mhz; 328 if (sc->cpu_minmhz > sc->cpu_curmhz) { 329 cpufreq_set_clock(sc, op); 330 } 331 return (err); 332 } 333 334 static int 335 cpufreq_sysctl_maxmhz(SYSCTL_HANDLER_ARGS) 336 { 337 struct imx6_anatop_softc *sc; 338 struct oppt * op; 339 uint32_t temp; 340 int err; 341 342 sc = arg1; 343 344 temp = sc->cpu_maxmhz; 345 err = sysctl_handle_int(oidp, &temp, 0, req); 346 if (err != 0 || req->newptr == NULL) 347 return (err); 348 349 op = cpufreq_nearest_oppt(sc, temp); 350 if (op->mhz < sc->cpu_minmhz) 351 return (ERANGE); 352 else if (op->mhz == sc->cpu_maxmhz) 353 return (0); 354 355 /* 356 * Value changed, update softc and hardware. The hardware update is 357 * unconditional. We always try to run at max speed, so any change of 358 * the max means we need to change the current speed too, regardless of 359 * whether it is higher or lower than the old max. 360 */ 361 sc->cpu_maxmhz = op->mhz; 362 cpufreq_set_clock(sc, op); 363 364 return (err); 365 } 366 367 static void 368 cpufreq_initialize(struct imx6_anatop_softc *sc) 369 { 370 uint32_t cfg3speed; 371 struct oppt * op; 372 373 SYSCTL_ADD_INT(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx6), 374 OID_AUTO, "cpu_mhz", CTLFLAG_RD, &sc->cpu_curmhz, 0, 375 "CPU frequency"); 376 377 SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx6), 378 OID_AUTO, "cpu_minmhz", CTLTYPE_INT | CTLFLAG_RWTUN, sc, 0, 379 cpufreq_sysctl_minmhz, "IU", "Minimum CPU frequency"); 380 381 SYSCTL_ADD_PROC(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx6), 382 OID_AUTO, "cpu_maxmhz", CTLTYPE_INT | CTLFLAG_RWTUN, sc, 0, 383 cpufreq_sysctl_maxmhz, "IU", "Maximum CPU frequency"); 384 385 SYSCTL_ADD_INT(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx6), 386 OID_AUTO, "cpu_maxmhz_hw", CTLFLAG_RD, &sc->cpu_maxmhz_hw, 0, 387 "Maximum CPU frequency allowed by hardware"); 388 389 SYSCTL_ADD_INT(NULL, SYSCTL_STATIC_CHILDREN(_hw_imx6), 390 OID_AUTO, "cpu_overclock_enable", CTLFLAG_RWTUN, 391 &sc->cpu_overclock_enable, 0, 392 "Allow setting CPU frequency higher than cpu_maxmhz_hw"); 393 394 /* 395 * XXX 24mhz shouldn't be hard-coded, should get this from imx6_ccm 396 * (even though in the real world it will always be 24mhz). Oh wait a 397 * sec, I never wrote imx6_ccm. 398 */ 399 sc->refosc_mhz = 24; 400 401 /* 402 * Get the maximum speed this cpu can be set to. The values in the 403 * OCOTP CFG3 register are not documented in the reference manual. 404 * The following info was in an archived email found via web search: 405 * - 2b'11: 1200000000Hz; 406 * - 2b'10: 996000000Hz; 407 * - 2b'01: 852000000Hz; -- i.MX6Q Only, exclusive with 996MHz. 408 * - 2b'00: 792000000Hz; 409 * The default hardware max speed can be overridden by a tunable. 410 */ 411 cfg3speed = (fsl_ocotp_read_4(FSL_OCOTP_CFG3) & 412 FSL_OCOTP_CFG3_SPEED_MASK) >> FSL_OCOTP_CFG3_SPEED_SHIFT; 413 sc->cpu_maxmhz_hw = imx6_ocotp_mhz_tab[cfg3speed]; 414 sc->cpu_maxmhz = sc->cpu_maxmhz_hw; 415 416 TUNABLE_INT_FETCH("hw.imx6.cpu_overclock_enable", 417 &sc->cpu_overclock_enable); 418 419 TUNABLE_INT_FETCH("hw.imx6.cpu_minmhz", &sc->cpu_minmhz); 420 op = cpufreq_nearest_oppt(sc, sc->cpu_minmhz); 421 sc->cpu_minmhz = op->mhz; 422 sc->cpu_minmv = op->mv; 423 424 TUNABLE_INT_FETCH("hw.imx6.cpu_maxmhz", &sc->cpu_maxmhz); 425 op = cpufreq_nearest_oppt(sc, sc->cpu_maxmhz); 426 sc->cpu_maxmhz = op->mhz; 427 sc->cpu_maxmv = op->mv; 428 429 /* 430 * Set the CPU to maximum speed. 431 * 432 * We won't have thermal throttling until interrupts are enabled, but we 433 * want to run at full speed through all the device init stuff. This 434 * basically assumes that a single core can't overheat before interrupts 435 * are enabled; empirical testing shows that to be a safe assumption. 436 */ 437 cpufreq_set_clock(sc, op); 438 } 439 440 static inline uint32_t 441 temp_from_count(struct imx6_anatop_softc *sc, uint32_t count) 442 { 443 444 return (((sc->temp_high_val - (count - sc->temp_high_cnt) * 445 (sc->temp_high_val - 250) / 446 (sc->temp_room_cnt - sc->temp_high_cnt)))); 447 } 448 449 static inline uint32_t 450 temp_to_count(struct imx6_anatop_softc *sc, uint32_t temp) 451 { 452 453 return ((sc->temp_room_cnt - sc->temp_high_cnt) * 454 (sc->temp_high_val - temp) / (sc->temp_high_val - 250) + 455 sc->temp_high_cnt); 456 } 457 458 static void 459 temp_update_count(struct imx6_anatop_softc *sc) 460 { 461 uint32_t val; 462 463 val = imx6_anatop_read_4(IMX6_ANALOG_TEMPMON_TEMPSENSE0); 464 if (!(val & IMX6_ANALOG_TEMPMON_TEMPSENSE0_VALID)) 465 return; 466 sc->temp_last_cnt = 467 (val & IMX6_ANALOG_TEMPMON_TEMPSENSE0_TEMP_CNT_MASK) >> 468 IMX6_ANALOG_TEMPMON_TEMPSENSE0_TEMP_CNT_SHIFT; 469 } 470 471 static int 472 temp_sysctl_handler(SYSCTL_HANDLER_ARGS) 473 { 474 struct imx6_anatop_softc *sc = arg1; 475 uint32_t t; 476 477 temp_update_count(sc); 478 479 t = temp_from_count(sc, sc->temp_last_cnt) + TZ_ZEROC; 480 481 return (sysctl_handle_int(oidp, &t, 0, req)); 482 } 483 484 static int 485 temp_throttle_sysctl_handler(SYSCTL_HANDLER_ARGS) 486 { 487 struct imx6_anatop_softc *sc = arg1; 488 int err; 489 uint32_t temp; 490 491 temp = sc->temp_throttle_val + TZ_ZEROC; 492 err = sysctl_handle_int(oidp, &temp, 0, req); 493 if (temp < TZ_ZEROC) 494 return (ERANGE); 495 temp -= TZ_ZEROC; 496 if (err != 0 || req->newptr == NULL || temp == sc->temp_throttle_val) 497 return (err); 498 499 /* Value changed, update counts in softc and hardware. */ 500 sc->temp_throttle_val = temp; 501 sc->temp_throttle_trigger_cnt = temp_to_count(sc, sc->temp_throttle_val); 502 sc->temp_throttle_reset_cnt = temp_to_count(sc, sc->temp_throttle_val - 100); 503 imx6_anatop_write_4(IMX6_ANALOG_TEMPMON_TEMPSENSE0_CLR, 504 IMX6_ANALOG_TEMPMON_TEMPSENSE0_ALARM_MASK); 505 imx6_anatop_write_4(IMX6_ANALOG_TEMPMON_TEMPSENSE0_SET, 506 (sc->temp_throttle_trigger_cnt << 507 IMX6_ANALOG_TEMPMON_TEMPSENSE0_ALARM_SHIFT)); 508 return (err); 509 } 510 511 static void 512 tempmon_gofast(struct imx6_anatop_softc *sc) 513 { 514 515 if (sc->cpu_curmhz < sc->cpu_maxmhz) { 516 cpufreq_set_clock(sc, cpufreq_nearest_oppt(sc, sc->cpu_maxmhz)); 517 } 518 } 519 520 static void 521 tempmon_goslow(struct imx6_anatop_softc *sc) 522 { 523 524 if (sc->cpu_curmhz > sc->cpu_minmhz) { 525 cpufreq_set_clock(sc, cpufreq_nearest_oppt(sc, sc->cpu_minmhz)); 526 } 527 } 528 529 static int 530 tempmon_intr(void *arg) 531 { 532 struct imx6_anatop_softc *sc = arg; 533 534 /* 535 * XXX Note that this code doesn't currently run (for some mysterious 536 * reason we just never get an interrupt), so the real monitoring is 537 * done by tempmon_throttle_check(). 538 */ 539 tempmon_goslow(sc); 540 /* XXX Schedule callout to speed back up eventually. */ 541 return (FILTER_HANDLED); 542 } 543 544 static void 545 tempmon_throttle_check(void *arg) 546 { 547 struct imx6_anatop_softc *sc = arg; 548 549 /* Lower counts are higher temperatures. */ 550 if (sc->temp_last_cnt < sc->temp_throttle_trigger_cnt) 551 tempmon_goslow(sc); 552 else if (sc->temp_last_cnt > (sc->temp_throttle_reset_cnt)) 553 tempmon_gofast(sc); 554 555 callout_reset_sbt(&sc->temp_throttle_callout, sc->temp_throttle_delay, 556 0, tempmon_throttle_check, sc, 0); 557 558 } 559 560 static void 561 initialize_tempmon(struct imx6_anatop_softc *sc) 562 { 563 uint32_t cal; 564 struct sysctl_ctx_list *ctx; 565 566 /* 567 * Fetch calibration data: a sensor count at room temperature (25C), 568 * a sensor count at a high temperature, and that temperature 569 */ 570 cal = fsl_ocotp_read_4(FSL_OCOTP_ANA1); 571 sc->temp_room_cnt = (cal & 0xFFF00000) >> 20; 572 sc->temp_high_cnt = (cal & 0x000FFF00) >> 8; 573 sc->temp_high_val = (cal & 0x000000FF) * 10; 574 575 /* 576 * Throttle to a lower cpu freq at 10C below the "hot" temperature, and 577 * reset back to max cpu freq at 5C below the trigger. 578 */ 579 sc->temp_throttle_val = sc->temp_high_val - 100; 580 sc->temp_throttle_trigger_cnt = 581 temp_to_count(sc, sc->temp_throttle_val); 582 sc->temp_throttle_reset_cnt = 583 temp_to_count(sc, sc->temp_throttle_val - 50); 584 585 /* 586 * Set the sensor to sample automatically at 16Hz (32.768KHz/0x800), set 587 * the throttle count, and begin making measurements. 588 */ 589 imx6_anatop_write_4(IMX6_ANALOG_TEMPMON_TEMPSENSE1, 0x0800); 590 imx6_anatop_write_4(IMX6_ANALOG_TEMPMON_TEMPSENSE0, 591 (sc->temp_throttle_trigger_cnt << 592 IMX6_ANALOG_TEMPMON_TEMPSENSE0_ALARM_SHIFT) | 593 IMX6_ANALOG_TEMPMON_TEMPSENSE0_MEASURE); 594 595 /* 596 * XXX Note that the alarm-interrupt feature isn't working yet, so 597 * we'll use a callout handler to check at 10Hz. Make sure we have an 598 * initial temperature reading before starting up the callouts so we 599 * don't get a bogus reading of zero. 600 */ 601 while (sc->temp_last_cnt == 0) 602 temp_update_count(sc); 603 sc->temp_throttle_delay = 100 * SBT_1MS; 604 callout_init(&sc->temp_throttle_callout, 0); 605 callout_reset_sbt(&sc->temp_throttle_callout, sc->temp_throttle_delay, 606 0, tempmon_throttle_check, sc, 0); 607 608 ctx = device_get_sysctl_ctx(sc->dev); 609 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)), 610 OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD, sc, 0, 611 temp_sysctl_handler, "IK", "Current die temperature"); 612 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)), 613 OID_AUTO, "throttle_temperature", CTLTYPE_INT | CTLFLAG_RW, sc, 614 0, temp_throttle_sysctl_handler, "IK", 615 "Throttle CPU when exceeding this temperature"); 616 } 617 618 static int 619 imx6_anatop_detach(device_t dev) 620 { 621 622 return (EBUSY); 623 } 624 625 static int 626 imx6_anatop_attach(device_t dev) 627 { 628 struct imx6_anatop_softc *sc; 629 int err; 630 631 sc = device_get_softc(dev); 632 sc->dev = dev; 633 634 /* Allocate bus_space resources. */ 635 if (bus_alloc_resources(dev, imx6_anatop_spec, sc->res)) { 636 device_printf(dev, "Cannot allocate resources\n"); 637 err = ENXIO; 638 goto out; 639 } 640 641 err = bus_setup_intr(dev, sc->res[IRQRES], INTR_TYPE_MISC | INTR_MPSAFE, 642 tempmon_intr, NULL, sc, &sc->temp_intrhand); 643 if (err != 0) 644 goto out; 645 646 SYSCTL_ADD_UINT(device_get_sysctl_ctx(sc->dev), 647 SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)), 648 OID_AUTO, "cpu_voltage", CTLFLAG_RD, 649 &sc->cpu_curmv, 0, "Current CPU voltage in millivolts"); 650 651 imx6_anatop_sc = sc; 652 653 /* 654 * Other code seen on the net sets this SELFBIASOFF flag around the same 655 * time the temperature sensor is set up, although it's unclear how the 656 * two are related (if at all). 657 */ 658 imx6_anatop_write_4(IMX6_ANALOG_PMU_MISC0_SET, 659 IMX6_ANALOG_PMU_MISC0_SELFBIASOFF); 660 661 cpufreq_initialize(sc); 662 initialize_tempmon(sc); 663 664 if (bootverbose) { 665 device_printf(sc->dev, "CPU %uMHz @ %umV\n", sc->cpu_curmhz, 666 sc->cpu_curmv); 667 } 668 err = 0; 669 670 out: 671 672 if (err != 0) { 673 bus_release_resources(dev, imx6_anatop_spec, sc->res); 674 } 675 676 return (err); 677 } 678 679 static int 680 imx6_anatop_probe(device_t dev) 681 { 682 683 if (!ofw_bus_status_okay(dev)) 684 return (ENXIO); 685 686 if (ofw_bus_is_compatible(dev, "fsl,imx6q-anatop") == 0) 687 return (ENXIO); 688 689 device_set_desc(dev, "Freescale i.MX6 Analog PLLs and Power"); 690 691 return (BUS_PROBE_DEFAULT); 692 } 693 694 uint32_t 695 imx6_get_cpu_clock() 696 { 697 uint32_t div; 698 699 div = imx6_anatop_read_4(IMX6_ANALOG_CCM_PLL_ARM) & 700 IMX6_ANALOG_CCM_PLL_ARM_DIV_MASK; 701 return (cpufreq_mhz_from_div(imx6_anatop_sc, div)); 702 } 703 704 static device_method_t imx6_anatop_methods[] = { 705 /* Device interface */ 706 DEVMETHOD(device_probe, imx6_anatop_probe), 707 DEVMETHOD(device_attach, imx6_anatop_attach), 708 DEVMETHOD(device_detach, imx6_anatop_detach), 709 710 DEVMETHOD_END 711 }; 712 713 static driver_t imx6_anatop_driver = { 714 "imx6_anatop", 715 imx6_anatop_methods, 716 sizeof(struct imx6_anatop_softc) 717 }; 718 719 static devclass_t imx6_anatop_devclass; 720 721 DRIVER_MODULE(imx6_anatop, simplebus, imx6_anatop_driver, imx6_anatop_devclass, 0, 0); 722 723