1 /* 2 * Windfarm PowerMac thermal control. iMac G5 iSight 3 * 4 * (c) Copyright 2007 Étienne Bersac <bersace@gmail.com> 5 * 6 * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin 7 * Herrenschmidt, IBM Corp. <benh@kernel.crashing.org> 8 * 9 * Released under the term of the GNU GPL v2. 10 * 11 * 12 * 13 * PowerMac12,1 14 * ============ 15 * 16 * 17 * The algorithm used is the PID control algorithm, used the same way 18 * the published Darwin code does, using the same values that are 19 * present in the Darwin 8.10 snapshot property lists (note however 20 * that none of the code has been re-used, it's a complete 21 * re-implementation 22 * 23 * There is two models using PowerMac12,1. Model 2 is iMac G5 iSight 24 * 17" while Model 3 is iMac G5 20". They do have both the same 25 * controls with a tiny difference. The control-ids of hard-drive-fan 26 * and cpu-fan is swapped. 27 * 28 * 29 * Target Correction : 30 * 31 * controls have a target correction calculated as : 32 * 33 * new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value 34 * new_value = max(new_value, max(new_min, 0)) 35 * 36 * OD Fan control correction. 37 * 38 * # model_id: 2 39 * offset : -19563152 40 * slope : 1956315 41 * 42 * # model_id: 3 43 * offset : -15650652 44 * slope : 1565065 45 * 46 * HD Fan control correction. 47 * 48 * # model_id: 2 49 * offset : -15650652 50 * slope : 1565065 51 * 52 * # model_id: 3 53 * offset : -19563152 54 * slope : 1956315 55 * 56 * CPU Fan control correction. 57 * 58 * # model_id: 2 59 * offset : -25431900 60 * slope : 2543190 61 * 62 * # model_id: 3 63 * offset : -15650652 64 * slope : 1565065 65 * 66 * 67 * Target rubber-banding : 68 * 69 * Some controls have a target correction which depends on another 70 * control value. The correction is computed in the following way : 71 * 72 * new_min = ref_value * slope + offset 73 * 74 * ref_value is the value of the reference control. If new_min is 75 * greater than 0, then we correct the target value using : 76 * 77 * new_target = max (new_target, new_min >> 16) 78 * 79 * 80 * # model_id : 2 81 * control : cpu-fan 82 * ref : optical-drive-fan 83 * offset : -15650652 84 * slope : 1565065 85 * 86 * # model_id : 3 87 * control : optical-drive-fan 88 * ref : hard-drive-fan 89 * offset : -32768000 90 * slope : 65536 91 * 92 * 93 * In order to have the moste efficient correction with those 94 * dependencies, we must trigger HD loop before OD loop before CPU 95 * loop. 96 * 97 * 98 * The various control loops found in Darwin config file are: 99 * 100 * HD Fan control loop. 101 * 102 * # model_id: 2 103 * control : hard-drive-fan 104 * sensor : hard-drive-temp 105 * PID params : G_d = 0x00000000 106 * G_p = 0x002D70A3 107 * G_r = 0x00019999 108 * History = 2 entries 109 * Input target = 0x370000 110 * Interval = 5s 111 * 112 * # model_id: 3 113 * control : hard-drive-fan 114 * sensor : hard-drive-temp 115 * PID params : G_d = 0x00000000 116 * G_p = 0x002170A3 117 * G_r = 0x00019999 118 * History = 2 entries 119 * Input target = 0x370000 120 * Interval = 5s 121 * 122 * OD Fan control loop. 123 * 124 * # model_id: 2 125 * control : optical-drive-fan 126 * sensor : optical-drive-temp 127 * PID params : G_d = 0x00000000 128 * G_p = 0x001FAE14 129 * G_r = 0x00019999 130 * History = 2 entries 131 * Input target = 0x320000 132 * Interval = 5s 133 * 134 * # model_id: 3 135 * control : optical-drive-fan 136 * sensor : optical-drive-temp 137 * PID params : G_d = 0x00000000 138 * G_p = 0x001FAE14 139 * G_r = 0x00019999 140 * History = 2 entries 141 * Input target = 0x320000 142 * Interval = 5s 143 * 144 * GPU Fan control loop. 145 * 146 * # model_id: 2 147 * control : hard-drive-fan 148 * sensor : gpu-temp 149 * PID params : G_d = 0x00000000 150 * G_p = 0x002A6666 151 * G_r = 0x00019999 152 * History = 2 entries 153 * Input target = 0x5A0000 154 * Interval = 5s 155 * 156 * # model_id: 3 157 * control : cpu-fan 158 * sensor : gpu-temp 159 * PID params : G_d = 0x00000000 160 * G_p = 0x0010CCCC 161 * G_r = 0x00019999 162 * History = 2 entries 163 * Input target = 0x500000 164 * Interval = 5s 165 * 166 * KODIAK (aka northbridge) Fan control loop. 167 * 168 * # model_id: 2 169 * control : optical-drive-fan 170 * sensor : north-bridge-temp 171 * PID params : G_d = 0x00000000 172 * G_p = 0x003BD70A 173 * G_r = 0x00019999 174 * History = 2 entries 175 * Input target = 0x550000 176 * Interval = 5s 177 * 178 * # model_id: 3 179 * control : hard-drive-fan 180 * sensor : north-bridge-temp 181 * PID params : G_d = 0x00000000 182 * G_p = 0x0030F5C2 183 * G_r = 0x00019999 184 * History = 2 entries 185 * Input target = 0x550000 186 * Interval = 5s 187 * 188 * CPU Fan control loop. 189 * 190 * control : cpu-fan 191 * sensors : cpu-temp, cpu-power 192 * PID params : from SDB partition 193 * 194 * 195 * CPU Slew control loop. 196 * 197 * control : cpufreq-clamp 198 * sensor : cpu-temp 199 * 200 */ 201 202 #undef DEBUG 203 204 #include <linux/types.h> 205 #include <linux/errno.h> 206 #include <linux/kernel.h> 207 #include <linux/delay.h> 208 #include <linux/slab.h> 209 #include <linux/init.h> 210 #include <linux/spinlock.h> 211 #include <linux/wait.h> 212 #include <linux/kmod.h> 213 #include <linux/device.h> 214 #include <linux/platform_device.h> 215 #include <asm/prom.h> 216 #include <asm/machdep.h> 217 #include <asm/io.h> 218 #include <asm/sections.h> 219 #include <asm/smu.h> 220 221 #include "windfarm.h" 222 #include "windfarm_pid.h" 223 224 #define VERSION "0.3" 225 226 static int pm121_mach_model; /* machine model id */ 227 228 /* Controls & sensors */ 229 static struct wf_sensor *sensor_cpu_power; 230 static struct wf_sensor *sensor_cpu_temp; 231 static struct wf_sensor *sensor_cpu_voltage; 232 static struct wf_sensor *sensor_cpu_current; 233 static struct wf_sensor *sensor_gpu_temp; 234 static struct wf_sensor *sensor_north_bridge_temp; 235 static struct wf_sensor *sensor_hard_drive_temp; 236 static struct wf_sensor *sensor_optical_drive_temp; 237 static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */ 238 239 enum { 240 FAN_CPU, 241 FAN_HD, 242 FAN_OD, 243 CPUFREQ, 244 N_CONTROLS 245 }; 246 static struct wf_control *controls[N_CONTROLS] = {}; 247 248 /* Set to kick the control loop into life */ 249 static int pm121_all_controls_ok, pm121_all_sensors_ok, pm121_started; 250 251 enum { 252 FAILURE_FAN = 1 << 0, 253 FAILURE_SENSOR = 1 << 1, 254 FAILURE_OVERTEMP = 1 << 2 255 }; 256 257 /* All sys loops. Note the HD before the OD loop in order to have it 258 run before. */ 259 enum { 260 LOOP_GPU, /* control = hd or cpu, but luckily, 261 it doesn't matter */ 262 LOOP_HD, /* control = hd */ 263 LOOP_KODIAK, /* control = hd or od */ 264 LOOP_OD, /* control = od */ 265 N_LOOPS 266 }; 267 268 static const char *loop_names[N_LOOPS] = { 269 "GPU", 270 "HD", 271 "KODIAK", 272 "OD", 273 }; 274 275 #define PM121_NUM_CONFIGS 2 276 277 static unsigned int pm121_failure_state; 278 static int pm121_readjust, pm121_skipping; 279 static bool pm121_overtemp; 280 static s32 average_power; 281 282 struct pm121_correction { 283 int offset; 284 int slope; 285 }; 286 287 static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = { 288 /* FAN_OD */ 289 { 290 /* MODEL 2 */ 291 { .offset = -19563152, 292 .slope = 1956315 293 }, 294 /* MODEL 3 */ 295 { .offset = -15650652, 296 .slope = 1565065 297 }, 298 }, 299 /* FAN_HD */ 300 { 301 /* MODEL 2 */ 302 { .offset = -15650652, 303 .slope = 1565065 304 }, 305 /* MODEL 3 */ 306 { .offset = -19563152, 307 .slope = 1956315 308 }, 309 }, 310 /* FAN_CPU */ 311 { 312 /* MODEL 2 */ 313 { .offset = -25431900, 314 .slope = 2543190 315 }, 316 /* MODEL 3 */ 317 { .offset = -15650652, 318 .slope = 1565065 319 }, 320 }, 321 /* CPUFREQ has no correction (and is not implemented at all) */ 322 }; 323 324 struct pm121_connection { 325 unsigned int control_id; 326 unsigned int ref_id; 327 struct pm121_correction correction; 328 }; 329 330 static struct pm121_connection pm121_connections[] = { 331 /* MODEL 2 */ 332 { .control_id = FAN_CPU, 333 .ref_id = FAN_OD, 334 { .offset = -32768000, 335 .slope = 65536 336 } 337 }, 338 /* MODEL 3 */ 339 { .control_id = FAN_OD, 340 .ref_id = FAN_HD, 341 { .offset = -32768000, 342 .slope = 65536 343 } 344 }, 345 }; 346 347 /* pointer to the current model connection */ 348 static struct pm121_connection *pm121_connection; 349 350 /* 351 * ****** System Fans Control Loop ****** 352 * 353 */ 354 355 /* Since each loop handles only one control and we want to avoid 356 * writing virtual control, we store the control correction with the 357 * loop params. Some data are not set, there are common to all loop 358 * and thus, hardcoded. 359 */ 360 struct pm121_sys_param { 361 /* purely informative since we use mach_model-2 as index */ 362 int model_id; 363 struct wf_sensor **sensor; /* use sensor_id instead ? */ 364 s32 gp, itarget; 365 unsigned int control_id; 366 }; 367 368 static struct pm121_sys_param 369 pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = { 370 /* GPU Fan control loop */ 371 { 372 { .model_id = 2, 373 .sensor = &sensor_gpu_temp, 374 .gp = 0x002A6666, 375 .itarget = 0x5A0000, 376 .control_id = FAN_HD, 377 }, 378 { .model_id = 3, 379 .sensor = &sensor_gpu_temp, 380 .gp = 0x0010CCCC, 381 .itarget = 0x500000, 382 .control_id = FAN_CPU, 383 }, 384 }, 385 /* HD Fan control loop */ 386 { 387 { .model_id = 2, 388 .sensor = &sensor_hard_drive_temp, 389 .gp = 0x002D70A3, 390 .itarget = 0x370000, 391 .control_id = FAN_HD, 392 }, 393 { .model_id = 3, 394 .sensor = &sensor_hard_drive_temp, 395 .gp = 0x002170A3, 396 .itarget = 0x370000, 397 .control_id = FAN_HD, 398 }, 399 }, 400 /* KODIAK Fan control loop */ 401 { 402 { .model_id = 2, 403 .sensor = &sensor_north_bridge_temp, 404 .gp = 0x003BD70A, 405 .itarget = 0x550000, 406 .control_id = FAN_OD, 407 }, 408 { .model_id = 3, 409 .sensor = &sensor_north_bridge_temp, 410 .gp = 0x0030F5C2, 411 .itarget = 0x550000, 412 .control_id = FAN_HD, 413 }, 414 }, 415 /* OD Fan control loop */ 416 { 417 { .model_id = 2, 418 .sensor = &sensor_optical_drive_temp, 419 .gp = 0x001FAE14, 420 .itarget = 0x320000, 421 .control_id = FAN_OD, 422 }, 423 { .model_id = 3, 424 .sensor = &sensor_optical_drive_temp, 425 .gp = 0x001FAE14, 426 .itarget = 0x320000, 427 .control_id = FAN_OD, 428 }, 429 }, 430 }; 431 432 /* the hardcoded values */ 433 #define PM121_SYS_GD 0x00000000 434 #define PM121_SYS_GR 0x00019999 435 #define PM121_SYS_HISTORY_SIZE 2 436 #define PM121_SYS_INTERVAL 5 437 438 /* State data used by the system fans control loop 439 */ 440 struct pm121_sys_state { 441 int ticks; 442 s32 setpoint; 443 struct wf_pid_state pid; 444 }; 445 446 struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {}; 447 448 /* 449 * ****** CPU Fans Control Loop ****** 450 * 451 */ 452 453 #define PM121_CPU_INTERVAL 1 454 455 /* State data used by the cpu fans control loop 456 */ 457 struct pm121_cpu_state { 458 int ticks; 459 s32 setpoint; 460 struct wf_cpu_pid_state pid; 461 }; 462 463 static struct pm121_cpu_state *pm121_cpu_state; 464 465 466 467 /* 468 * ***** Implementation ***** 469 * 470 */ 471 472 /* correction the value using the output-low-bound correction algo */ 473 static s32 pm121_correct(s32 new_setpoint, 474 unsigned int control_id, 475 s32 min) 476 { 477 s32 new_min; 478 struct pm121_correction *correction; 479 correction = &corrections[control_id][pm121_mach_model - 2]; 480 481 new_min = (average_power * correction->slope) >> 16; 482 new_min += correction->offset; 483 new_min = (new_min >> 16) + min; 484 485 return max3(new_setpoint, new_min, 0); 486 } 487 488 static s32 pm121_connect(unsigned int control_id, s32 setpoint) 489 { 490 s32 new_min, value, new_setpoint; 491 492 if (pm121_connection->control_id == control_id) { 493 controls[control_id]->ops->get_value(controls[control_id], 494 &value); 495 new_min = value * pm121_connection->correction.slope; 496 new_min += pm121_connection->correction.offset; 497 if (new_min > 0) { 498 new_setpoint = max(setpoint, (new_min >> 16)); 499 if (new_setpoint != setpoint) { 500 pr_debug("pm121: %s depending on %s, " 501 "corrected from %d to %d RPM\n", 502 controls[control_id]->name, 503 controls[pm121_connection->ref_id]->name, 504 (int) setpoint, (int) new_setpoint); 505 } 506 } else 507 new_setpoint = setpoint; 508 } 509 /* no connection */ 510 else 511 new_setpoint = setpoint; 512 513 return new_setpoint; 514 } 515 516 /* FAN LOOPS */ 517 static void pm121_create_sys_fans(int loop_id) 518 { 519 struct pm121_sys_param *param = NULL; 520 struct wf_pid_param pid_param; 521 struct wf_control *control = NULL; 522 int i; 523 524 /* First, locate the params for this model */ 525 for (i = 0; i < PM121_NUM_CONFIGS; i++) { 526 if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) { 527 param = &(pm121_sys_all_params[loop_id][i]); 528 break; 529 } 530 } 531 532 /* No params found, put fans to max */ 533 if (param == NULL) { 534 printk(KERN_WARNING "pm121: %s fan config not found " 535 " for this machine model\n", 536 loop_names[loop_id]); 537 goto fail; 538 } 539 540 control = controls[param->control_id]; 541 542 /* Alloc & initialize state */ 543 pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state), 544 GFP_KERNEL); 545 if (pm121_sys_state[loop_id] == NULL) { 546 printk(KERN_WARNING "pm121: Memory allocation error\n"); 547 goto fail; 548 } 549 pm121_sys_state[loop_id]->ticks = 1; 550 551 /* Fill PID params */ 552 pid_param.gd = PM121_SYS_GD; 553 pid_param.gp = param->gp; 554 pid_param.gr = PM121_SYS_GR; 555 pid_param.interval = PM121_SYS_INTERVAL; 556 pid_param.history_len = PM121_SYS_HISTORY_SIZE; 557 pid_param.itarget = param->itarget; 558 if(control) 559 { 560 pid_param.min = control->ops->get_min(control); 561 pid_param.max = control->ops->get_max(control); 562 } else { 563 /* 564 * This is probably not the right!? 565 * Perhaps goto fail if control == NULL above? 566 */ 567 pid_param.min = 0; 568 pid_param.max = 0; 569 } 570 571 wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param); 572 573 pr_debug("pm121: %s Fan control loop initialized.\n" 574 " itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 575 loop_names[loop_id], FIX32TOPRINT(pid_param.itarget), 576 pid_param.min, pid_param.max); 577 return; 578 579 fail: 580 /* note that this is not optimal since another loop may still 581 control the same control */ 582 printk(KERN_WARNING "pm121: failed to set up %s loop " 583 "setting \"%s\" to max speed.\n", 584 loop_names[loop_id], control ? control->name : "uninitialized value"); 585 586 if (control) 587 wf_control_set_max(control); 588 } 589 590 static void pm121_sys_fans_tick(int loop_id) 591 { 592 struct pm121_sys_param *param; 593 struct pm121_sys_state *st; 594 struct wf_sensor *sensor; 595 struct wf_control *control; 596 s32 temp, new_setpoint; 597 int rc; 598 599 param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]); 600 st = pm121_sys_state[loop_id]; 601 sensor = *(param->sensor); 602 control = controls[param->control_id]; 603 604 if (--st->ticks != 0) { 605 if (pm121_readjust) 606 goto readjust; 607 return; 608 } 609 st->ticks = PM121_SYS_INTERVAL; 610 611 rc = sensor->ops->get_value(sensor, &temp); 612 if (rc) { 613 printk(KERN_WARNING "windfarm: %s sensor error %d\n", 614 sensor->name, rc); 615 pm121_failure_state |= FAILURE_SENSOR; 616 return; 617 } 618 619 pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n", 620 loop_names[loop_id], sensor->name, 621 FIX32TOPRINT(temp)); 622 623 new_setpoint = wf_pid_run(&st->pid, temp); 624 625 /* correction */ 626 new_setpoint = pm121_correct(new_setpoint, 627 param->control_id, 628 st->pid.param.min); 629 /* linked corretion */ 630 new_setpoint = pm121_connect(param->control_id, new_setpoint); 631 632 if (new_setpoint == st->setpoint) 633 return; 634 st->setpoint = new_setpoint; 635 pr_debug("pm121: %s corrected setpoint: %d RPM\n", 636 control->name, (int)new_setpoint); 637 readjust: 638 if (control && pm121_failure_state == 0) { 639 rc = control->ops->set_value(control, st->setpoint); 640 if (rc) { 641 printk(KERN_WARNING "windfarm: %s fan error %d\n", 642 control->name, rc); 643 pm121_failure_state |= FAILURE_FAN; 644 } 645 } 646 } 647 648 649 /* CPU LOOP */ 650 static void pm121_create_cpu_fans(void) 651 { 652 struct wf_cpu_pid_param pid_param; 653 const struct smu_sdbp_header *hdr; 654 struct smu_sdbp_cpupiddata *piddata; 655 struct smu_sdbp_fvt *fvt; 656 struct wf_control *fan_cpu; 657 s32 tmax, tdelta, maxpow, powadj; 658 659 fan_cpu = controls[FAN_CPU]; 660 661 /* First, locate the PID params in SMU SBD */ 662 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); 663 if (hdr == 0) { 664 printk(KERN_WARNING "pm121: CPU PID fan config not found.\n"); 665 goto fail; 666 } 667 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; 668 669 /* Get the FVT params for operating point 0 (the only supported one 670 * for now) in order to get tmax 671 */ 672 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); 673 if (hdr) { 674 fvt = (struct smu_sdbp_fvt *)&hdr[1]; 675 tmax = ((s32)fvt->maxtemp) << 16; 676 } else 677 tmax = 0x5e0000; /* 94 degree default */ 678 679 /* Alloc & initialize state */ 680 pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state), 681 GFP_KERNEL); 682 if (pm121_cpu_state == NULL) 683 goto fail; 684 pm121_cpu_state->ticks = 1; 685 686 /* Fill PID params */ 687 pid_param.interval = PM121_CPU_INTERVAL; 688 pid_param.history_len = piddata->history_len; 689 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { 690 printk(KERN_WARNING "pm121: History size overflow on " 691 "CPU control loop (%d)\n", piddata->history_len); 692 pid_param.history_len = WF_CPU_PID_MAX_HISTORY; 693 } 694 pid_param.gd = piddata->gd; 695 pid_param.gp = piddata->gp; 696 pid_param.gr = piddata->gr / pid_param.history_len; 697 698 tdelta = ((s32)piddata->target_temp_delta) << 16; 699 maxpow = ((s32)piddata->max_power) << 16; 700 powadj = ((s32)piddata->power_adj) << 16; 701 702 pid_param.tmax = tmax; 703 pid_param.ttarget = tmax - tdelta; 704 pid_param.pmaxadj = maxpow - powadj; 705 706 pid_param.min = fan_cpu->ops->get_min(fan_cpu); 707 pid_param.max = fan_cpu->ops->get_max(fan_cpu); 708 709 wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param); 710 711 pr_debug("pm121: CPU Fan control initialized.\n"); 712 pr_debug(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n", 713 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), 714 pid_param.min, pid_param.max); 715 716 return; 717 718 fail: 719 printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n"); 720 721 if (controls[CPUFREQ]) 722 wf_control_set_max(controls[CPUFREQ]); 723 if (fan_cpu) 724 wf_control_set_max(fan_cpu); 725 } 726 727 728 static void pm121_cpu_fans_tick(struct pm121_cpu_state *st) 729 { 730 s32 new_setpoint, temp, power; 731 struct wf_control *fan_cpu = NULL; 732 int rc; 733 734 if (--st->ticks != 0) { 735 if (pm121_readjust) 736 goto readjust; 737 return; 738 } 739 st->ticks = PM121_CPU_INTERVAL; 740 741 fan_cpu = controls[FAN_CPU]; 742 743 rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); 744 if (rc) { 745 printk(KERN_WARNING "pm121: CPU temp sensor error %d\n", 746 rc); 747 pm121_failure_state |= FAILURE_SENSOR; 748 return; 749 } 750 751 rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); 752 if (rc) { 753 printk(KERN_WARNING "pm121: CPU power sensor error %d\n", 754 rc); 755 pm121_failure_state |= FAILURE_SENSOR; 756 return; 757 } 758 759 pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n", 760 FIX32TOPRINT(temp), FIX32TOPRINT(power)); 761 762 if (temp > st->pid.param.tmax) 763 pm121_failure_state |= FAILURE_OVERTEMP; 764 765 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); 766 767 /* correction */ 768 new_setpoint = pm121_correct(new_setpoint, 769 FAN_CPU, 770 st->pid.param.min); 771 772 /* connected correction */ 773 new_setpoint = pm121_connect(FAN_CPU, new_setpoint); 774 775 if (st->setpoint == new_setpoint) 776 return; 777 st->setpoint = new_setpoint; 778 pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint); 779 780 readjust: 781 if (fan_cpu && pm121_failure_state == 0) { 782 rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint); 783 if (rc) { 784 printk(KERN_WARNING "pm121: %s fan error %d\n", 785 fan_cpu->name, rc); 786 pm121_failure_state |= FAILURE_FAN; 787 } 788 } 789 } 790 791 /* 792 * ****** Common ****** 793 * 794 */ 795 796 static void pm121_tick(void) 797 { 798 unsigned int last_failure = pm121_failure_state; 799 unsigned int new_failure; 800 s32 total_power; 801 int i; 802 803 if (!pm121_started) { 804 pr_debug("pm121: creating control loops !\n"); 805 for (i = 0; i < N_LOOPS; i++) 806 pm121_create_sys_fans(i); 807 808 pm121_create_cpu_fans(); 809 pm121_started = 1; 810 } 811 812 /* skipping ticks */ 813 if (pm121_skipping && --pm121_skipping) 814 return; 815 816 /* compute average power */ 817 total_power = 0; 818 for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++) 819 total_power += pm121_cpu_state->pid.powers[i]; 820 821 average_power = total_power / pm121_cpu_state->pid.param.history_len; 822 823 824 pm121_failure_state = 0; 825 for (i = 0 ; i < N_LOOPS; i++) { 826 if (pm121_sys_state[i]) 827 pm121_sys_fans_tick(i); 828 } 829 830 if (pm121_cpu_state) 831 pm121_cpu_fans_tick(pm121_cpu_state); 832 833 pm121_readjust = 0; 834 new_failure = pm121_failure_state & ~last_failure; 835 836 /* If entering failure mode, clamp cpufreq and ramp all 837 * fans to full speed. 838 */ 839 if (pm121_failure_state && !last_failure) { 840 for (i = 0; i < N_CONTROLS; i++) { 841 if (controls[i]) 842 wf_control_set_max(controls[i]); 843 } 844 } 845 846 /* If leaving failure mode, unclamp cpufreq and readjust 847 * all fans on next iteration 848 */ 849 if (!pm121_failure_state && last_failure) { 850 if (controls[CPUFREQ]) 851 wf_control_set_min(controls[CPUFREQ]); 852 pm121_readjust = 1; 853 } 854 855 /* Overtemp condition detected, notify and start skipping a couple 856 * ticks to let the temperature go down 857 */ 858 if (new_failure & FAILURE_OVERTEMP) { 859 wf_set_overtemp(); 860 pm121_skipping = 2; 861 pm121_overtemp = true; 862 } 863 864 /* We only clear the overtemp condition if overtemp is cleared 865 * _and_ no other failure is present. Since a sensor error will 866 * clear the overtemp condition (can't measure temperature) at 867 * the control loop levels, but we don't want to keep it clear 868 * here in this case 869 */ 870 if (!pm121_failure_state && pm121_overtemp) { 871 wf_clear_overtemp(); 872 pm121_overtemp = false; 873 } 874 } 875 876 877 static struct wf_control* pm121_register_control(struct wf_control *ct, 878 const char *match, 879 unsigned int id) 880 { 881 if (controls[id] == NULL && !strcmp(ct->name, match)) { 882 if (wf_get_control(ct) == 0) 883 controls[id] = ct; 884 } 885 return controls[id]; 886 } 887 888 static void pm121_new_control(struct wf_control *ct) 889 { 890 int all = 1; 891 892 if (pm121_all_controls_ok) 893 return; 894 895 all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all; 896 all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all; 897 all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all; 898 all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all; 899 900 if (all) 901 pm121_all_controls_ok = 1; 902 } 903 904 905 906 907 static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor, 908 const char *match, 909 struct wf_sensor **var) 910 { 911 if (*var == NULL && !strcmp(sensor->name, match)) { 912 if (wf_get_sensor(sensor) == 0) 913 *var = sensor; 914 } 915 return *var; 916 } 917 918 static void pm121_new_sensor(struct wf_sensor *sr) 919 { 920 int all = 1; 921 922 if (pm121_all_sensors_ok) 923 return; 924 925 all = pm121_register_sensor(sr, "cpu-temp", 926 &sensor_cpu_temp) && all; 927 all = pm121_register_sensor(sr, "cpu-current", 928 &sensor_cpu_current) && all; 929 all = pm121_register_sensor(sr, "cpu-voltage", 930 &sensor_cpu_voltage) && all; 931 all = pm121_register_sensor(sr, "cpu-power", 932 &sensor_cpu_power) && all; 933 all = pm121_register_sensor(sr, "hard-drive-temp", 934 &sensor_hard_drive_temp) && all; 935 all = pm121_register_sensor(sr, "optical-drive-temp", 936 &sensor_optical_drive_temp) && all; 937 all = pm121_register_sensor(sr, "incoming-air-temp", 938 &sensor_incoming_air_temp) && all; 939 all = pm121_register_sensor(sr, "north-bridge-temp", 940 &sensor_north_bridge_temp) && all; 941 all = pm121_register_sensor(sr, "gpu-temp", 942 &sensor_gpu_temp) && all; 943 944 if (all) 945 pm121_all_sensors_ok = 1; 946 } 947 948 949 950 static int pm121_notify(struct notifier_block *self, 951 unsigned long event, void *data) 952 { 953 switch (event) { 954 case WF_EVENT_NEW_CONTROL: 955 pr_debug("pm121: new control %s detected\n", 956 ((struct wf_control *)data)->name); 957 pm121_new_control(data); 958 break; 959 case WF_EVENT_NEW_SENSOR: 960 pr_debug("pm121: new sensor %s detected\n", 961 ((struct wf_sensor *)data)->name); 962 pm121_new_sensor(data); 963 break; 964 case WF_EVENT_TICK: 965 if (pm121_all_controls_ok && pm121_all_sensors_ok) 966 pm121_tick(); 967 break; 968 } 969 970 return 0; 971 } 972 973 static struct notifier_block pm121_events = { 974 .notifier_call = pm121_notify, 975 }; 976 977 static int pm121_init_pm(void) 978 { 979 const struct smu_sdbp_header *hdr; 980 981 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); 982 if (hdr != 0) { 983 struct smu_sdbp_sensortree *st = 984 (struct smu_sdbp_sensortree *)&hdr[1]; 985 pm121_mach_model = st->model_id; 986 } 987 988 pm121_connection = &pm121_connections[pm121_mach_model - 2]; 989 990 printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n", 991 pm121_mach_model); 992 993 return 0; 994 } 995 996 997 static int pm121_probe(struct platform_device *ddev) 998 { 999 wf_register_client(&pm121_events); 1000 1001 return 0; 1002 } 1003 1004 static int pm121_remove(struct platform_device *ddev) 1005 { 1006 wf_unregister_client(&pm121_events); 1007 return 0; 1008 } 1009 1010 static struct platform_driver pm121_driver = { 1011 .probe = pm121_probe, 1012 .remove = pm121_remove, 1013 .driver = { 1014 .name = "windfarm", 1015 .bus = &platform_bus_type, 1016 }, 1017 }; 1018 1019 1020 static int __init pm121_init(void) 1021 { 1022 int rc = -ENODEV; 1023 1024 if (of_machine_is_compatible("PowerMac12,1")) 1025 rc = pm121_init_pm(); 1026 1027 if (rc == 0) { 1028 request_module("windfarm_smu_controls"); 1029 request_module("windfarm_smu_sensors"); 1030 request_module("windfarm_smu_sat"); 1031 request_module("windfarm_lm75_sensor"); 1032 request_module("windfarm_max6690_sensor"); 1033 request_module("windfarm_cpufreq_clamp"); 1034 platform_driver_register(&pm121_driver); 1035 } 1036 1037 return rc; 1038 } 1039 1040 static void __exit pm121_exit(void) 1041 { 1042 1043 platform_driver_unregister(&pm121_driver); 1044 } 1045 1046 1047 module_init(pm121_init); 1048 module_exit(pm121_exit); 1049 1050 MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>"); 1051 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)"); 1052 MODULE_LICENSE("GPL"); 1053 1054