1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Windfarm PowerMac thermal control. iMac G5 iSight 4 * 5 * (c) Copyright 2007 Étienne Bersac <bersace@gmail.com> 6 * 7 * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin 8 * Herrenschmidt, IBM Corp. <benh@kernel.crashing.org> 9 * 10 * PowerMac12,1 11 * ============ 12 * 13 * The algorithm used is the PID control algorithm, used the same way 14 * the published Darwin code does, using the same values that are 15 * present in the Darwin 8.10 snapshot property lists (note however 16 * that none of the code has been re-used, it's a complete 17 * re-implementation 18 * 19 * There is two models using PowerMac12,1. Model 2 is iMac G5 iSight 20 * 17" while Model 3 is iMac G5 20". They do have both the same 21 * controls with a tiny difference. The control-ids of hard-drive-fan 22 * and cpu-fan is swapped. 23 * 24 * Target Correction : 25 * 26 * controls have a target correction calculated as : 27 * 28 * new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value 29 * new_value = max(new_value, max(new_min, 0)) 30 * 31 * OD Fan control correction. 32 * 33 * # model_id: 2 34 * offset : -19563152 35 * slope : 1956315 36 * 37 * # model_id: 3 38 * offset : -15650652 39 * slope : 1565065 40 * 41 * HD Fan control correction. 42 * 43 * # model_id: 2 44 * offset : -15650652 45 * slope : 1565065 46 * 47 * # model_id: 3 48 * offset : -19563152 49 * slope : 1956315 50 * 51 * CPU Fan control correction. 52 * 53 * # model_id: 2 54 * offset : -25431900 55 * slope : 2543190 56 * 57 * # model_id: 3 58 * offset : -15650652 59 * slope : 1565065 60 * 61 * Target rubber-banding : 62 * 63 * Some controls have a target correction which depends on another 64 * control value. The correction is computed in the following way : 65 * 66 * new_min = ref_value * slope + offset 67 * 68 * ref_value is the value of the reference control. If new_min is 69 * greater than 0, then we correct the target value using : 70 * 71 * new_target = max (new_target, new_min >> 16) 72 * 73 * # model_id : 2 74 * control : cpu-fan 75 * ref : optical-drive-fan 76 * offset : -15650652 77 * slope : 1565065 78 * 79 * # model_id : 3 80 * control : optical-drive-fan 81 * ref : hard-drive-fan 82 * offset : -32768000 83 * slope : 65536 84 * 85 * In order to have the moste efficient correction with those 86 * dependencies, we must trigger HD loop before OD loop before CPU 87 * loop. 88 * 89 * The various control loops found in Darwin config file are: 90 * 91 * HD Fan control loop. 92 * 93 * # model_id: 2 94 * control : hard-drive-fan 95 * sensor : hard-drive-temp 96 * PID params : G_d = 0x00000000 97 * G_p = 0x002D70A3 98 * G_r = 0x00019999 99 * History = 2 entries 100 * Input target = 0x370000 101 * Interval = 5s 102 * 103 * # model_id: 3 104 * control : hard-drive-fan 105 * sensor : hard-drive-temp 106 * PID params : G_d = 0x00000000 107 * G_p = 0x002170A3 108 * G_r = 0x00019999 109 * History = 2 entries 110 * Input target = 0x370000 111 * Interval = 5s 112 * 113 * OD Fan control loop. 114 * 115 * # model_id: 2 116 * control : optical-drive-fan 117 * sensor : optical-drive-temp 118 * PID params : G_d = 0x00000000 119 * G_p = 0x001FAE14 120 * G_r = 0x00019999 121 * History = 2 entries 122 * Input target = 0x320000 123 * Interval = 5s 124 * 125 * # model_id: 3 126 * control : optical-drive-fan 127 * sensor : optical-drive-temp 128 * PID params : G_d = 0x00000000 129 * G_p = 0x001FAE14 130 * G_r = 0x00019999 131 * History = 2 entries 132 * Input target = 0x320000 133 * Interval = 5s 134 * 135 * GPU Fan control loop. 136 * 137 * # model_id: 2 138 * control : hard-drive-fan 139 * sensor : gpu-temp 140 * PID params : G_d = 0x00000000 141 * G_p = 0x002A6666 142 * G_r = 0x00019999 143 * History = 2 entries 144 * Input target = 0x5A0000 145 * Interval = 5s 146 * 147 * # model_id: 3 148 * control : cpu-fan 149 * sensor : gpu-temp 150 * PID params : G_d = 0x00000000 151 * G_p = 0x0010CCCC 152 * G_r = 0x00019999 153 * History = 2 entries 154 * Input target = 0x500000 155 * Interval = 5s 156 * 157 * KODIAK (aka northbridge) Fan control loop. 158 * 159 * # model_id: 2 160 * control : optical-drive-fan 161 * sensor : north-bridge-temp 162 * PID params : G_d = 0x00000000 163 * G_p = 0x003BD70A 164 * G_r = 0x00019999 165 * History = 2 entries 166 * Input target = 0x550000 167 * Interval = 5s 168 * 169 * # model_id: 3 170 * control : hard-drive-fan 171 * sensor : north-bridge-temp 172 * PID params : G_d = 0x00000000 173 * G_p = 0x0030F5C2 174 * G_r = 0x00019999 175 * History = 2 entries 176 * Input target = 0x550000 177 * Interval = 5s 178 * 179 * CPU Fan control loop. 180 * 181 * control : cpu-fan 182 * sensors : cpu-temp, cpu-power 183 * PID params : from SDB partition 184 * 185 * CPU Slew control loop. 186 * 187 * control : cpufreq-clamp 188 * sensor : cpu-temp 189 */ 190 191 #undef DEBUG 192 193 #include <linux/types.h> 194 #include <linux/errno.h> 195 #include <linux/kernel.h> 196 #include <linux/delay.h> 197 #include <linux/slab.h> 198 #include <linux/init.h> 199 #include <linux/spinlock.h> 200 #include <linux/wait.h> 201 #include <linux/kmod.h> 202 #include <linux/device.h> 203 #include <linux/platform_device.h> 204 #include <asm/prom.h> 205 #include <asm/machdep.h> 206 #include <asm/io.h> 207 #include <asm/sections.h> 208 #include <asm/smu.h> 209 210 #include "windfarm.h" 211 #include "windfarm_pid.h" 212 213 #define VERSION "0.3" 214 215 static int pm121_mach_model; /* machine model id */ 216 217 /* Controls & sensors */ 218 static struct wf_sensor *sensor_cpu_power; 219 static struct wf_sensor *sensor_cpu_temp; 220 static struct wf_sensor *sensor_cpu_voltage; 221 static struct wf_sensor *sensor_cpu_current; 222 static struct wf_sensor *sensor_gpu_temp; 223 static struct wf_sensor *sensor_north_bridge_temp; 224 static struct wf_sensor *sensor_hard_drive_temp; 225 static struct wf_sensor *sensor_optical_drive_temp; 226 static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */ 227 228 enum { 229 FAN_CPU, 230 FAN_HD, 231 FAN_OD, 232 CPUFREQ, 233 N_CONTROLS 234 }; 235 static struct wf_control *controls[N_CONTROLS] = {}; 236 237 /* Set to kick the control loop into life */ 238 static int pm121_all_controls_ok, pm121_all_sensors_ok; 239 static bool pm121_started; 240 241 enum { 242 FAILURE_FAN = 1 << 0, 243 FAILURE_SENSOR = 1 << 1, 244 FAILURE_OVERTEMP = 1 << 2 245 }; 246 247 /* All sys loops. Note the HD before the OD loop in order to have it 248 run before. */ 249 enum { 250 LOOP_GPU, /* control = hd or cpu, but luckily, 251 it doesn't matter */ 252 LOOP_HD, /* control = hd */ 253 LOOP_KODIAK, /* control = hd or od */ 254 LOOP_OD, /* control = od */ 255 N_LOOPS 256 }; 257 258 static const char *loop_names[N_LOOPS] = { 259 "GPU", 260 "HD", 261 "KODIAK", 262 "OD", 263 }; 264 265 #define PM121_NUM_CONFIGS 2 266 267 static unsigned int pm121_failure_state; 268 static int pm121_readjust, pm121_skipping; 269 static bool pm121_overtemp; 270 static s32 average_power; 271 272 struct pm121_correction { 273 int offset; 274 int slope; 275 }; 276 277 static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = { 278 /* FAN_OD */ 279 { 280 /* MODEL 2 */ 281 { .offset = -19563152, 282 .slope = 1956315 283 }, 284 /* MODEL 3 */ 285 { .offset = -15650652, 286 .slope = 1565065 287 }, 288 }, 289 /* FAN_HD */ 290 { 291 /* MODEL 2 */ 292 { .offset = -15650652, 293 .slope = 1565065 294 }, 295 /* MODEL 3 */ 296 { .offset = -19563152, 297 .slope = 1956315 298 }, 299 }, 300 /* FAN_CPU */ 301 { 302 /* MODEL 2 */ 303 { .offset = -25431900, 304 .slope = 2543190 305 }, 306 /* MODEL 3 */ 307 { .offset = -15650652, 308 .slope = 1565065 309 }, 310 }, 311 /* CPUFREQ has no correction (and is not implemented at all) */ 312 }; 313 314 struct pm121_connection { 315 unsigned int control_id; 316 unsigned int ref_id; 317 struct pm121_correction correction; 318 }; 319 320 static struct pm121_connection pm121_connections[] = { 321 /* MODEL 2 */ 322 { .control_id = FAN_CPU, 323 .ref_id = FAN_OD, 324 { .offset = -32768000, 325 .slope = 65536 326 } 327 }, 328 /* MODEL 3 */ 329 { .control_id = FAN_OD, 330 .ref_id = FAN_HD, 331 { .offset = -32768000, 332 .slope = 65536 333 } 334 }, 335 }; 336 337 /* pointer to the current model connection */ 338 static struct pm121_connection *pm121_connection; 339 340 /* 341 * ****** System Fans Control Loop ****** 342 * 343 */ 344 345 /* Since each loop handles only one control and we want to avoid 346 * writing virtual control, we store the control correction with the 347 * loop params. Some data are not set, there are common to all loop 348 * and thus, hardcoded. 349 */ 350 struct pm121_sys_param { 351 /* purely informative since we use mach_model-2 as index */ 352 int model_id; 353 struct wf_sensor **sensor; /* use sensor_id instead ? */ 354 s32 gp, itarget; 355 unsigned int control_id; 356 }; 357 358 static struct pm121_sys_param 359 pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = { 360 /* GPU Fan control loop */ 361 { 362 { .model_id = 2, 363 .sensor = &sensor_gpu_temp, 364 .gp = 0x002A6666, 365 .itarget = 0x5A0000, 366 .control_id = FAN_HD, 367 }, 368 { .model_id = 3, 369 .sensor = &sensor_gpu_temp, 370 .gp = 0x0010CCCC, 371 .itarget = 0x500000, 372 .control_id = FAN_CPU, 373 }, 374 }, 375 /* HD Fan control loop */ 376 { 377 { .model_id = 2, 378 .sensor = &sensor_hard_drive_temp, 379 .gp = 0x002D70A3, 380 .itarget = 0x370000, 381 .control_id = FAN_HD, 382 }, 383 { .model_id = 3, 384 .sensor = &sensor_hard_drive_temp, 385 .gp = 0x002170A3, 386 .itarget = 0x370000, 387 .control_id = FAN_HD, 388 }, 389 }, 390 /* KODIAK Fan control loop */ 391 { 392 { .model_id = 2, 393 .sensor = &sensor_north_bridge_temp, 394 .gp = 0x003BD70A, 395 .itarget = 0x550000, 396 .control_id = FAN_OD, 397 }, 398 { .model_id = 3, 399 .sensor = &sensor_north_bridge_temp, 400 .gp = 0x0030F5C2, 401 .itarget = 0x550000, 402 .control_id = FAN_HD, 403 }, 404 }, 405 /* OD Fan control loop */ 406 { 407 { .model_id = 2, 408 .sensor = &sensor_optical_drive_temp, 409 .gp = 0x001FAE14, 410 .itarget = 0x320000, 411 .control_id = FAN_OD, 412 }, 413 { .model_id = 3, 414 .sensor = &sensor_optical_drive_temp, 415 .gp = 0x001FAE14, 416 .itarget = 0x320000, 417 .control_id = FAN_OD, 418 }, 419 }, 420 }; 421 422 /* the hardcoded values */ 423 #define PM121_SYS_GD 0x00000000 424 #define PM121_SYS_GR 0x00019999 425 #define PM121_SYS_HISTORY_SIZE 2 426 #define PM121_SYS_INTERVAL 5 427 428 /* State data used by the system fans control loop 429 */ 430 struct pm121_sys_state { 431 int ticks; 432 s32 setpoint; 433 struct wf_pid_state pid; 434 }; 435 436 static struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {}; 437 438 /* 439 * ****** CPU Fans Control Loop ****** 440 * 441 */ 442 443 #define PM121_CPU_INTERVAL 1 444 445 /* State data used by the cpu fans control loop 446 */ 447 struct pm121_cpu_state { 448 int ticks; 449 s32 setpoint; 450 struct wf_cpu_pid_state pid; 451 }; 452 453 static struct pm121_cpu_state *pm121_cpu_state; 454 455 456 457 /* 458 * ***** Implementation ***** 459 * 460 */ 461 462 /* correction the value using the output-low-bound correction algo */ 463 static s32 pm121_correct(s32 new_setpoint, 464 unsigned int control_id, 465 s32 min) 466 { 467 s32 new_min; 468 struct pm121_correction *correction; 469 correction = &corrections[control_id][pm121_mach_model - 2]; 470 471 new_min = (average_power * correction->slope) >> 16; 472 new_min += correction->offset; 473 new_min = (new_min >> 16) + min; 474 475 return max3(new_setpoint, new_min, 0); 476 } 477 478 static s32 pm121_connect(unsigned int control_id, s32 setpoint) 479 { 480 s32 new_min, value, new_setpoint; 481 482 if (pm121_connection->control_id == control_id) { 483 controls[control_id]->ops->get_value(controls[control_id], 484 &value); 485 new_min = value * pm121_connection->correction.slope; 486 new_min += pm121_connection->correction.offset; 487 if (new_min > 0) { 488 new_setpoint = max(setpoint, (new_min >> 16)); 489 if (new_setpoint != setpoint) { 490 pr_debug("pm121: %s depending on %s, " 491 "corrected from %d to %d RPM\n", 492 controls[control_id]->name, 493 controls[pm121_connection->ref_id]->name, 494 (int) setpoint, (int) new_setpoint); 495 } 496 } else 497 new_setpoint = setpoint; 498 } 499 /* no connection */ 500 else 501 new_setpoint = setpoint; 502 503 return new_setpoint; 504 } 505 506 /* FAN LOOPS */ 507 static void pm121_create_sys_fans(int loop_id) 508 { 509 struct pm121_sys_param *param = NULL; 510 struct wf_pid_param pid_param; 511 struct wf_control *control = NULL; 512 int i; 513 514 /* First, locate the params for this model */ 515 for (i = 0; i < PM121_NUM_CONFIGS; i++) { 516 if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) { 517 param = &(pm121_sys_all_params[loop_id][i]); 518 break; 519 } 520 } 521 522 /* No params found, put fans to max */ 523 if (param == NULL) { 524 printk(KERN_WARNING "pm121: %s fan config not found " 525 " for this machine model\n", 526 loop_names[loop_id]); 527 goto fail; 528 } 529 530 control = controls[param->control_id]; 531 532 /* Alloc & initialize state */ 533 pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state), 534 GFP_KERNEL); 535 if (pm121_sys_state[loop_id] == NULL) { 536 printk(KERN_WARNING "pm121: Memory allocation error\n"); 537 goto fail; 538 } 539 pm121_sys_state[loop_id]->ticks = 1; 540 541 /* Fill PID params */ 542 pid_param.gd = PM121_SYS_GD; 543 pid_param.gp = param->gp; 544 pid_param.gr = PM121_SYS_GR; 545 pid_param.interval = PM121_SYS_INTERVAL; 546 pid_param.history_len = PM121_SYS_HISTORY_SIZE; 547 pid_param.itarget = param->itarget; 548 if(control) 549 { 550 pid_param.min = control->ops->get_min(control); 551 pid_param.max = control->ops->get_max(control); 552 } else { 553 /* 554 * This is probably not the right!? 555 * Perhaps goto fail if control == NULL above? 556 */ 557 pid_param.min = 0; 558 pid_param.max = 0; 559 } 560 561 wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param); 562 563 pr_debug("pm121: %s Fan control loop initialized.\n" 564 " itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 565 loop_names[loop_id], FIX32TOPRINT(pid_param.itarget), 566 pid_param.min, pid_param.max); 567 return; 568 569 fail: 570 /* note that this is not optimal since another loop may still 571 control the same control */ 572 printk(KERN_WARNING "pm121: failed to set up %s loop " 573 "setting \"%s\" to max speed.\n", 574 loop_names[loop_id], control ? control->name : "uninitialized value"); 575 576 if (control) 577 wf_control_set_max(control); 578 } 579 580 static void pm121_sys_fans_tick(int loop_id) 581 { 582 struct pm121_sys_param *param; 583 struct pm121_sys_state *st; 584 struct wf_sensor *sensor; 585 struct wf_control *control; 586 s32 temp, new_setpoint; 587 int rc; 588 589 param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]); 590 st = pm121_sys_state[loop_id]; 591 sensor = *(param->sensor); 592 control = controls[param->control_id]; 593 594 if (--st->ticks != 0) { 595 if (pm121_readjust) 596 goto readjust; 597 return; 598 } 599 st->ticks = PM121_SYS_INTERVAL; 600 601 rc = sensor->ops->get_value(sensor, &temp); 602 if (rc) { 603 printk(KERN_WARNING "windfarm: %s sensor error %d\n", 604 sensor->name, rc); 605 pm121_failure_state |= FAILURE_SENSOR; 606 return; 607 } 608 609 pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n", 610 loop_names[loop_id], sensor->name, 611 FIX32TOPRINT(temp)); 612 613 new_setpoint = wf_pid_run(&st->pid, temp); 614 615 /* correction */ 616 new_setpoint = pm121_correct(new_setpoint, 617 param->control_id, 618 st->pid.param.min); 619 /* linked corretion */ 620 new_setpoint = pm121_connect(param->control_id, new_setpoint); 621 622 if (new_setpoint == st->setpoint) 623 return; 624 st->setpoint = new_setpoint; 625 pr_debug("pm121: %s corrected setpoint: %d RPM\n", 626 control->name, (int)new_setpoint); 627 readjust: 628 if (control && pm121_failure_state == 0) { 629 rc = control->ops->set_value(control, st->setpoint); 630 if (rc) { 631 printk(KERN_WARNING "windfarm: %s fan error %d\n", 632 control->name, rc); 633 pm121_failure_state |= FAILURE_FAN; 634 } 635 } 636 } 637 638 639 /* CPU LOOP */ 640 static void pm121_create_cpu_fans(void) 641 { 642 struct wf_cpu_pid_param pid_param; 643 const struct smu_sdbp_header *hdr; 644 struct smu_sdbp_cpupiddata *piddata; 645 struct smu_sdbp_fvt *fvt; 646 struct wf_control *fan_cpu; 647 s32 tmax, tdelta, maxpow, powadj; 648 649 fan_cpu = controls[FAN_CPU]; 650 651 /* First, locate the PID params in SMU SBD */ 652 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); 653 if (hdr == 0) { 654 printk(KERN_WARNING "pm121: CPU PID fan config not found.\n"); 655 goto fail; 656 } 657 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; 658 659 /* Get the FVT params for operating point 0 (the only supported one 660 * for now) in order to get tmax 661 */ 662 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); 663 if (hdr) { 664 fvt = (struct smu_sdbp_fvt *)&hdr[1]; 665 tmax = ((s32)fvt->maxtemp) << 16; 666 } else 667 tmax = 0x5e0000; /* 94 degree default */ 668 669 /* Alloc & initialize state */ 670 pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state), 671 GFP_KERNEL); 672 if (pm121_cpu_state == NULL) 673 goto fail; 674 pm121_cpu_state->ticks = 1; 675 676 /* Fill PID params */ 677 pid_param.interval = PM121_CPU_INTERVAL; 678 pid_param.history_len = piddata->history_len; 679 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { 680 printk(KERN_WARNING "pm121: History size overflow on " 681 "CPU control loop (%d)\n", piddata->history_len); 682 pid_param.history_len = WF_CPU_PID_MAX_HISTORY; 683 } 684 pid_param.gd = piddata->gd; 685 pid_param.gp = piddata->gp; 686 pid_param.gr = piddata->gr / pid_param.history_len; 687 688 tdelta = ((s32)piddata->target_temp_delta) << 16; 689 maxpow = ((s32)piddata->max_power) << 16; 690 powadj = ((s32)piddata->power_adj) << 16; 691 692 pid_param.tmax = tmax; 693 pid_param.ttarget = tmax - tdelta; 694 pid_param.pmaxadj = maxpow - powadj; 695 696 pid_param.min = fan_cpu->ops->get_min(fan_cpu); 697 pid_param.max = fan_cpu->ops->get_max(fan_cpu); 698 699 wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param); 700 701 pr_debug("pm121: CPU Fan control initialized.\n"); 702 pr_debug(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n", 703 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), 704 pid_param.min, pid_param.max); 705 706 return; 707 708 fail: 709 printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n"); 710 711 if (controls[CPUFREQ]) 712 wf_control_set_max(controls[CPUFREQ]); 713 if (fan_cpu) 714 wf_control_set_max(fan_cpu); 715 } 716 717 718 static void pm121_cpu_fans_tick(struct pm121_cpu_state *st) 719 { 720 s32 new_setpoint, temp, power; 721 struct wf_control *fan_cpu = NULL; 722 int rc; 723 724 if (--st->ticks != 0) { 725 if (pm121_readjust) 726 goto readjust; 727 return; 728 } 729 st->ticks = PM121_CPU_INTERVAL; 730 731 fan_cpu = controls[FAN_CPU]; 732 733 rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); 734 if (rc) { 735 printk(KERN_WARNING "pm121: CPU temp sensor error %d\n", 736 rc); 737 pm121_failure_state |= FAILURE_SENSOR; 738 return; 739 } 740 741 rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); 742 if (rc) { 743 printk(KERN_WARNING "pm121: CPU power sensor error %d\n", 744 rc); 745 pm121_failure_state |= FAILURE_SENSOR; 746 return; 747 } 748 749 pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n", 750 FIX32TOPRINT(temp), FIX32TOPRINT(power)); 751 752 if (temp > st->pid.param.tmax) 753 pm121_failure_state |= FAILURE_OVERTEMP; 754 755 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); 756 757 /* correction */ 758 new_setpoint = pm121_correct(new_setpoint, 759 FAN_CPU, 760 st->pid.param.min); 761 762 /* connected correction */ 763 new_setpoint = pm121_connect(FAN_CPU, new_setpoint); 764 765 if (st->setpoint == new_setpoint) 766 return; 767 st->setpoint = new_setpoint; 768 pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint); 769 770 readjust: 771 if (fan_cpu && pm121_failure_state == 0) { 772 rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint); 773 if (rc) { 774 printk(KERN_WARNING "pm121: %s fan error %d\n", 775 fan_cpu->name, rc); 776 pm121_failure_state |= FAILURE_FAN; 777 } 778 } 779 } 780 781 /* 782 * ****** Common ****** 783 * 784 */ 785 786 static void pm121_tick(void) 787 { 788 unsigned int last_failure = pm121_failure_state; 789 unsigned int new_failure; 790 s32 total_power; 791 int i; 792 793 if (!pm121_started) { 794 pr_debug("pm121: creating control loops !\n"); 795 for (i = 0; i < N_LOOPS; i++) 796 pm121_create_sys_fans(i); 797 798 pm121_create_cpu_fans(); 799 pm121_started = true; 800 } 801 802 /* skipping ticks */ 803 if (pm121_skipping && --pm121_skipping) 804 return; 805 806 /* compute average power */ 807 total_power = 0; 808 for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++) 809 total_power += pm121_cpu_state->pid.powers[i]; 810 811 average_power = total_power / pm121_cpu_state->pid.param.history_len; 812 813 814 pm121_failure_state = 0; 815 for (i = 0 ; i < N_LOOPS; i++) { 816 if (pm121_sys_state[i]) 817 pm121_sys_fans_tick(i); 818 } 819 820 if (pm121_cpu_state) 821 pm121_cpu_fans_tick(pm121_cpu_state); 822 823 pm121_readjust = 0; 824 new_failure = pm121_failure_state & ~last_failure; 825 826 /* If entering failure mode, clamp cpufreq and ramp all 827 * fans to full speed. 828 */ 829 if (pm121_failure_state && !last_failure) { 830 for (i = 0; i < N_CONTROLS; i++) { 831 if (controls[i]) 832 wf_control_set_max(controls[i]); 833 } 834 } 835 836 /* If leaving failure mode, unclamp cpufreq and readjust 837 * all fans on next iteration 838 */ 839 if (!pm121_failure_state && last_failure) { 840 if (controls[CPUFREQ]) 841 wf_control_set_min(controls[CPUFREQ]); 842 pm121_readjust = 1; 843 } 844 845 /* Overtemp condition detected, notify and start skipping a couple 846 * ticks to let the temperature go down 847 */ 848 if (new_failure & FAILURE_OVERTEMP) { 849 wf_set_overtemp(); 850 pm121_skipping = 2; 851 pm121_overtemp = true; 852 } 853 854 /* We only clear the overtemp condition if overtemp is cleared 855 * _and_ no other failure is present. Since a sensor error will 856 * clear the overtemp condition (can't measure temperature) at 857 * the control loop levels, but we don't want to keep it clear 858 * here in this case 859 */ 860 if (!pm121_failure_state && pm121_overtemp) { 861 wf_clear_overtemp(); 862 pm121_overtemp = false; 863 } 864 } 865 866 867 static struct wf_control* pm121_register_control(struct wf_control *ct, 868 const char *match, 869 unsigned int id) 870 { 871 if (controls[id] == NULL && !strcmp(ct->name, match)) { 872 if (wf_get_control(ct) == 0) 873 controls[id] = ct; 874 } 875 return controls[id]; 876 } 877 878 static void pm121_new_control(struct wf_control *ct) 879 { 880 int all = 1; 881 882 if (pm121_all_controls_ok) 883 return; 884 885 all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all; 886 all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all; 887 all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all; 888 all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all; 889 890 if (all) 891 pm121_all_controls_ok = 1; 892 } 893 894 895 896 897 static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor, 898 const char *match, 899 struct wf_sensor **var) 900 { 901 if (*var == NULL && !strcmp(sensor->name, match)) { 902 if (wf_get_sensor(sensor) == 0) 903 *var = sensor; 904 } 905 return *var; 906 } 907 908 static void pm121_new_sensor(struct wf_sensor *sr) 909 { 910 int all = 1; 911 912 if (pm121_all_sensors_ok) 913 return; 914 915 all = pm121_register_sensor(sr, "cpu-temp", 916 &sensor_cpu_temp) && all; 917 all = pm121_register_sensor(sr, "cpu-current", 918 &sensor_cpu_current) && all; 919 all = pm121_register_sensor(sr, "cpu-voltage", 920 &sensor_cpu_voltage) && all; 921 all = pm121_register_sensor(sr, "cpu-power", 922 &sensor_cpu_power) && all; 923 all = pm121_register_sensor(sr, "hard-drive-temp", 924 &sensor_hard_drive_temp) && all; 925 all = pm121_register_sensor(sr, "optical-drive-temp", 926 &sensor_optical_drive_temp) && all; 927 all = pm121_register_sensor(sr, "incoming-air-temp", 928 &sensor_incoming_air_temp) && all; 929 all = pm121_register_sensor(sr, "north-bridge-temp", 930 &sensor_north_bridge_temp) && all; 931 all = pm121_register_sensor(sr, "gpu-temp", 932 &sensor_gpu_temp) && all; 933 934 if (all) 935 pm121_all_sensors_ok = 1; 936 } 937 938 939 940 static int pm121_notify(struct notifier_block *self, 941 unsigned long event, void *data) 942 { 943 switch (event) { 944 case WF_EVENT_NEW_CONTROL: 945 pr_debug("pm121: new control %s detected\n", 946 ((struct wf_control *)data)->name); 947 pm121_new_control(data); 948 break; 949 case WF_EVENT_NEW_SENSOR: 950 pr_debug("pm121: new sensor %s detected\n", 951 ((struct wf_sensor *)data)->name); 952 pm121_new_sensor(data); 953 break; 954 case WF_EVENT_TICK: 955 if (pm121_all_controls_ok && pm121_all_sensors_ok) 956 pm121_tick(); 957 break; 958 } 959 960 return 0; 961 } 962 963 static struct notifier_block pm121_events = { 964 .notifier_call = pm121_notify, 965 }; 966 967 static int pm121_init_pm(void) 968 { 969 const struct smu_sdbp_header *hdr; 970 971 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); 972 if (hdr != 0) { 973 struct smu_sdbp_sensortree *st = 974 (struct smu_sdbp_sensortree *)&hdr[1]; 975 pm121_mach_model = st->model_id; 976 } 977 978 pm121_connection = &pm121_connections[pm121_mach_model - 2]; 979 980 printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n", 981 pm121_mach_model); 982 983 return 0; 984 } 985 986 987 static int pm121_probe(struct platform_device *ddev) 988 { 989 wf_register_client(&pm121_events); 990 991 return 0; 992 } 993 994 static int pm121_remove(struct platform_device *ddev) 995 { 996 wf_unregister_client(&pm121_events); 997 return 0; 998 } 999 1000 static struct platform_driver pm121_driver = { 1001 .probe = pm121_probe, 1002 .remove = pm121_remove, 1003 .driver = { 1004 .name = "windfarm", 1005 .bus = &platform_bus_type, 1006 }, 1007 }; 1008 1009 1010 static int __init pm121_init(void) 1011 { 1012 int rc = -ENODEV; 1013 1014 if (of_machine_is_compatible("PowerMac12,1")) 1015 rc = pm121_init_pm(); 1016 1017 if (rc == 0) { 1018 request_module("windfarm_smu_controls"); 1019 request_module("windfarm_smu_sensors"); 1020 request_module("windfarm_smu_sat"); 1021 request_module("windfarm_lm75_sensor"); 1022 request_module("windfarm_max6690_sensor"); 1023 request_module("windfarm_cpufreq_clamp"); 1024 platform_driver_register(&pm121_driver); 1025 } 1026 1027 return rc; 1028 } 1029 1030 static void __exit pm121_exit(void) 1031 { 1032 1033 platform_driver_unregister(&pm121_driver); 1034 } 1035 1036 1037 module_init(pm121_init); 1038 module_exit(pm121_exit); 1039 1040 MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>"); 1041 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)"); 1042 MODULE_LICENSE("GPL"); 1043 1044