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 s32 average_power; 280 281 struct pm121_correction { 282 int offset; 283 int slope; 284 }; 285 286 static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = { 287 /* FAN_OD */ 288 { 289 /* MODEL 2 */ 290 { .offset = -19563152, 291 .slope = 1956315 292 }, 293 /* MODEL 3 */ 294 { .offset = -15650652, 295 .slope = 1565065 296 }, 297 }, 298 /* FAN_HD */ 299 { 300 /* MODEL 2 */ 301 { .offset = -15650652, 302 .slope = 1565065 303 }, 304 /* MODEL 3 */ 305 { .offset = -19563152, 306 .slope = 1956315 307 }, 308 }, 309 /* FAN_CPU */ 310 { 311 /* MODEL 2 */ 312 { .offset = -25431900, 313 .slope = 2543190 314 }, 315 /* MODEL 3 */ 316 { .offset = -15650652, 317 .slope = 1565065 318 }, 319 }, 320 /* CPUFREQ has no correction (and is not implemented at all) */ 321 }; 322 323 struct pm121_connection { 324 unsigned int control_id; 325 unsigned int ref_id; 326 struct pm121_correction correction; 327 }; 328 329 static struct pm121_connection pm121_connections[] = { 330 /* MODEL 2 */ 331 { .control_id = FAN_CPU, 332 .ref_id = FAN_OD, 333 { .offset = -32768000, 334 .slope = 65536 335 } 336 }, 337 /* MODEL 3 */ 338 { .control_id = FAN_OD, 339 .ref_id = FAN_HD, 340 { .offset = -32768000, 341 .slope = 65536 342 } 343 }, 344 }; 345 346 /* pointer to the current model connection */ 347 static struct pm121_connection *pm121_connection; 348 349 /* 350 * ****** System Fans Control Loop ****** 351 * 352 */ 353 354 /* Since each loop handles only one control and we want to avoid 355 * writing virtual control, we store the control correction with the 356 * loop params. Some data are not set, there are common to all loop 357 * and thus, hardcoded. 358 */ 359 struct pm121_sys_param { 360 /* purely informative since we use mach_model-2 as index */ 361 int model_id; 362 struct wf_sensor **sensor; /* use sensor_id instead ? */ 363 s32 gp, itarget; 364 unsigned int control_id; 365 }; 366 367 static struct pm121_sys_param 368 pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = { 369 /* GPU Fan control loop */ 370 { 371 { .model_id = 2, 372 .sensor = &sensor_gpu_temp, 373 .gp = 0x002A6666, 374 .itarget = 0x5A0000, 375 .control_id = FAN_HD, 376 }, 377 { .model_id = 3, 378 .sensor = &sensor_gpu_temp, 379 .gp = 0x0010CCCC, 380 .itarget = 0x500000, 381 .control_id = FAN_CPU, 382 }, 383 }, 384 /* HD Fan control loop */ 385 { 386 { .model_id = 2, 387 .sensor = &sensor_hard_drive_temp, 388 .gp = 0x002D70A3, 389 .itarget = 0x370000, 390 .control_id = FAN_HD, 391 }, 392 { .model_id = 3, 393 .sensor = &sensor_hard_drive_temp, 394 .gp = 0x002170A3, 395 .itarget = 0x370000, 396 .control_id = FAN_HD, 397 }, 398 }, 399 /* KODIAK Fan control loop */ 400 { 401 { .model_id = 2, 402 .sensor = &sensor_north_bridge_temp, 403 .gp = 0x003BD70A, 404 .itarget = 0x550000, 405 .control_id = FAN_OD, 406 }, 407 { .model_id = 3, 408 .sensor = &sensor_north_bridge_temp, 409 .gp = 0x0030F5C2, 410 .itarget = 0x550000, 411 .control_id = FAN_HD, 412 }, 413 }, 414 /* OD Fan control loop */ 415 { 416 { .model_id = 2, 417 .sensor = &sensor_optical_drive_temp, 418 .gp = 0x001FAE14, 419 .itarget = 0x320000, 420 .control_id = FAN_OD, 421 }, 422 { .model_id = 3, 423 .sensor = &sensor_optical_drive_temp, 424 .gp = 0x001FAE14, 425 .itarget = 0x320000, 426 .control_id = FAN_OD, 427 }, 428 }, 429 }; 430 431 /* the hardcoded values */ 432 #define PM121_SYS_GD 0x00000000 433 #define PM121_SYS_GR 0x00019999 434 #define PM121_SYS_HISTORY_SIZE 2 435 #define PM121_SYS_INTERVAL 5 436 437 /* State data used by the system fans control loop 438 */ 439 struct pm121_sys_state { 440 int ticks; 441 s32 setpoint; 442 struct wf_pid_state pid; 443 }; 444 445 struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {}; 446 447 /* 448 * ****** CPU Fans Control Loop ****** 449 * 450 */ 451 452 #define PM121_CPU_INTERVAL 1 453 454 /* State data used by the cpu fans control loop 455 */ 456 struct pm121_cpu_state { 457 int ticks; 458 s32 setpoint; 459 struct wf_cpu_pid_state pid; 460 }; 461 462 static struct pm121_cpu_state *pm121_cpu_state; 463 464 465 466 /* 467 * ***** Implementation ***** 468 * 469 */ 470 471 /* correction the value using the output-low-bound correction algo */ 472 static s32 pm121_correct(s32 new_setpoint, 473 unsigned int control_id, 474 s32 min) 475 { 476 s32 new_min; 477 struct pm121_correction *correction; 478 correction = &corrections[control_id][pm121_mach_model - 2]; 479 480 new_min = (average_power * correction->slope) >> 16; 481 new_min += correction->offset; 482 new_min = (new_min >> 16) + min; 483 484 return max3(new_setpoint, new_min, 0); 485 } 486 487 static s32 pm121_connect(unsigned int control_id, s32 setpoint) 488 { 489 s32 new_min, value, new_setpoint; 490 491 if (pm121_connection->control_id == control_id) { 492 controls[control_id]->ops->get_value(controls[control_id], 493 &value); 494 new_min = value * pm121_connection->correction.slope; 495 new_min += pm121_connection->correction.offset; 496 if (new_min > 0) { 497 new_setpoint = max(setpoint, (new_min >> 16)); 498 if (new_setpoint != setpoint) { 499 pr_debug("pm121: %s depending on %s, " 500 "corrected from %d to %d RPM\n", 501 controls[control_id]->name, 502 controls[pm121_connection->ref_id]->name, 503 (int) setpoint, (int) new_setpoint); 504 } 505 } else 506 new_setpoint = setpoint; 507 } 508 /* no connection */ 509 else 510 new_setpoint = setpoint; 511 512 return new_setpoint; 513 } 514 515 /* FAN LOOPS */ 516 static void pm121_create_sys_fans(int loop_id) 517 { 518 struct pm121_sys_param *param = NULL; 519 struct wf_pid_param pid_param; 520 struct wf_control *control = NULL; 521 int i; 522 523 /* First, locate the params for this model */ 524 for (i = 0; i < PM121_NUM_CONFIGS; i++) { 525 if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) { 526 param = &(pm121_sys_all_params[loop_id][i]); 527 break; 528 } 529 } 530 531 /* No params found, put fans to max */ 532 if (param == NULL) { 533 printk(KERN_WARNING "pm121: %s fan config not found " 534 " for this machine model\n", 535 loop_names[loop_id]); 536 goto fail; 537 } 538 539 control = controls[param->control_id]; 540 541 /* Alloc & initialize state */ 542 pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state), 543 GFP_KERNEL); 544 if (pm121_sys_state[loop_id] == NULL) { 545 printk(KERN_WARNING "pm121: Memory allocation error\n"); 546 goto fail; 547 } 548 pm121_sys_state[loop_id]->ticks = 1; 549 550 /* Fill PID params */ 551 pid_param.gd = PM121_SYS_GD; 552 pid_param.gp = param->gp; 553 pid_param.gr = PM121_SYS_GR; 554 pid_param.interval = PM121_SYS_INTERVAL; 555 pid_param.history_len = PM121_SYS_HISTORY_SIZE; 556 pid_param.itarget = param->itarget; 557 pid_param.min = control->ops->get_min(control); 558 pid_param.max = control->ops->get_max(control); 559 560 wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param); 561 562 pr_debug("pm121: %s Fan control loop initialized.\n" 563 " itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 564 loop_names[loop_id], FIX32TOPRINT(pid_param.itarget), 565 pid_param.min, pid_param.max); 566 return; 567 568 fail: 569 /* note that this is not optimal since another loop may still 570 control the same control */ 571 printk(KERN_WARNING "pm121: failed to set up %s loop " 572 "setting \"%s\" to max speed.\n", 573 loop_names[loop_id], control->name); 574 575 if (control) 576 wf_control_set_max(control); 577 } 578 579 static void pm121_sys_fans_tick(int loop_id) 580 { 581 struct pm121_sys_param *param; 582 struct pm121_sys_state *st; 583 struct wf_sensor *sensor; 584 struct wf_control *control; 585 s32 temp, new_setpoint; 586 int rc; 587 588 param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]); 589 st = pm121_sys_state[loop_id]; 590 sensor = *(param->sensor); 591 control = controls[param->control_id]; 592 593 if (--st->ticks != 0) { 594 if (pm121_readjust) 595 goto readjust; 596 return; 597 } 598 st->ticks = PM121_SYS_INTERVAL; 599 600 rc = sensor->ops->get_value(sensor, &temp); 601 if (rc) { 602 printk(KERN_WARNING "windfarm: %s sensor error %d\n", 603 sensor->name, rc); 604 pm121_failure_state |= FAILURE_SENSOR; 605 return; 606 } 607 608 pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n", 609 loop_names[loop_id], sensor->name, 610 FIX32TOPRINT(temp)); 611 612 new_setpoint = wf_pid_run(&st->pid, temp); 613 614 /* correction */ 615 new_setpoint = pm121_correct(new_setpoint, 616 param->control_id, 617 st->pid.param.min); 618 /* linked corretion */ 619 new_setpoint = pm121_connect(param->control_id, new_setpoint); 620 621 if (new_setpoint == st->setpoint) 622 return; 623 st->setpoint = new_setpoint; 624 pr_debug("pm121: %s corrected setpoint: %d RPM\n", 625 control->name, (int)new_setpoint); 626 readjust: 627 if (control && pm121_failure_state == 0) { 628 rc = control->ops->set_value(control, st->setpoint); 629 if (rc) { 630 printk(KERN_WARNING "windfarm: %s fan error %d\n", 631 control->name, rc); 632 pm121_failure_state |= FAILURE_FAN; 633 } 634 } 635 } 636 637 638 /* CPU LOOP */ 639 static void pm121_create_cpu_fans(void) 640 { 641 struct wf_cpu_pid_param pid_param; 642 const struct smu_sdbp_header *hdr; 643 struct smu_sdbp_cpupiddata *piddata; 644 struct smu_sdbp_fvt *fvt; 645 struct wf_control *fan_cpu; 646 s32 tmax, tdelta, maxpow, powadj; 647 648 fan_cpu = controls[FAN_CPU]; 649 650 /* First, locate the PID params in SMU SBD */ 651 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); 652 if (hdr == 0) { 653 printk(KERN_WARNING "pm121: CPU PID fan config not found.\n"); 654 goto fail; 655 } 656 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; 657 658 /* Get the FVT params for operating point 0 (the only supported one 659 * for now) in order to get tmax 660 */ 661 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); 662 if (hdr) { 663 fvt = (struct smu_sdbp_fvt *)&hdr[1]; 664 tmax = ((s32)fvt->maxtemp) << 16; 665 } else 666 tmax = 0x5e0000; /* 94 degree default */ 667 668 /* Alloc & initialize state */ 669 pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state), 670 GFP_KERNEL); 671 if (pm121_cpu_state == NULL) 672 goto fail; 673 pm121_cpu_state->ticks = 1; 674 675 /* Fill PID params */ 676 pid_param.interval = PM121_CPU_INTERVAL; 677 pid_param.history_len = piddata->history_len; 678 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { 679 printk(KERN_WARNING "pm121: History size overflow on " 680 "CPU control loop (%d)\n", piddata->history_len); 681 pid_param.history_len = WF_CPU_PID_MAX_HISTORY; 682 } 683 pid_param.gd = piddata->gd; 684 pid_param.gp = piddata->gp; 685 pid_param.gr = piddata->gr / pid_param.history_len; 686 687 tdelta = ((s32)piddata->target_temp_delta) << 16; 688 maxpow = ((s32)piddata->max_power) << 16; 689 powadj = ((s32)piddata->power_adj) << 16; 690 691 pid_param.tmax = tmax; 692 pid_param.ttarget = tmax - tdelta; 693 pid_param.pmaxadj = maxpow - powadj; 694 695 pid_param.min = fan_cpu->ops->get_min(fan_cpu); 696 pid_param.max = fan_cpu->ops->get_max(fan_cpu); 697 698 wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param); 699 700 pr_debug("pm121: CPU Fan control initialized.\n"); 701 pr_debug(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n", 702 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), 703 pid_param.min, pid_param.max); 704 705 return; 706 707 fail: 708 printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n"); 709 710 if (controls[CPUFREQ]) 711 wf_control_set_max(controls[CPUFREQ]); 712 if (fan_cpu) 713 wf_control_set_max(fan_cpu); 714 } 715 716 717 static void pm121_cpu_fans_tick(struct pm121_cpu_state *st) 718 { 719 s32 new_setpoint, temp, power; 720 struct wf_control *fan_cpu = NULL; 721 int rc; 722 723 if (--st->ticks != 0) { 724 if (pm121_readjust) 725 goto readjust; 726 return; 727 } 728 st->ticks = PM121_CPU_INTERVAL; 729 730 fan_cpu = controls[FAN_CPU]; 731 732 rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); 733 if (rc) { 734 printk(KERN_WARNING "pm121: CPU temp sensor error %d\n", 735 rc); 736 pm121_failure_state |= FAILURE_SENSOR; 737 return; 738 } 739 740 rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); 741 if (rc) { 742 printk(KERN_WARNING "pm121: CPU power sensor error %d\n", 743 rc); 744 pm121_failure_state |= FAILURE_SENSOR; 745 return; 746 } 747 748 pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n", 749 FIX32TOPRINT(temp), FIX32TOPRINT(power)); 750 751 if (temp > st->pid.param.tmax) 752 pm121_failure_state |= FAILURE_OVERTEMP; 753 754 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); 755 756 /* correction */ 757 new_setpoint = pm121_correct(new_setpoint, 758 FAN_CPU, 759 st->pid.param.min); 760 761 /* connected correction */ 762 new_setpoint = pm121_connect(FAN_CPU, new_setpoint); 763 764 if (st->setpoint == new_setpoint) 765 return; 766 st->setpoint = new_setpoint; 767 pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint); 768 769 readjust: 770 if (fan_cpu && pm121_failure_state == 0) { 771 rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint); 772 if (rc) { 773 printk(KERN_WARNING "pm121: %s fan error %d\n", 774 fan_cpu->name, rc); 775 pm121_failure_state |= FAILURE_FAN; 776 } 777 } 778 } 779 780 /* 781 * ****** Common ****** 782 * 783 */ 784 785 static void pm121_tick(void) 786 { 787 unsigned int last_failure = pm121_failure_state; 788 unsigned int new_failure; 789 s32 total_power; 790 int i; 791 792 if (!pm121_started) { 793 pr_debug("pm121: creating control loops !\n"); 794 for (i = 0; i < N_LOOPS; i++) 795 pm121_create_sys_fans(i); 796 797 pm121_create_cpu_fans(); 798 pm121_started = 1; 799 } 800 801 /* skipping ticks */ 802 if (pm121_skipping && --pm121_skipping) 803 return; 804 805 /* compute average power */ 806 total_power = 0; 807 for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++) 808 total_power += pm121_cpu_state->pid.powers[i]; 809 810 average_power = total_power / pm121_cpu_state->pid.param.history_len; 811 812 813 pm121_failure_state = 0; 814 for (i = 0 ; i < N_LOOPS; i++) { 815 if (pm121_sys_state[i]) 816 pm121_sys_fans_tick(i); 817 } 818 819 if (pm121_cpu_state) 820 pm121_cpu_fans_tick(pm121_cpu_state); 821 822 pm121_readjust = 0; 823 new_failure = pm121_failure_state & ~last_failure; 824 825 /* If entering failure mode, clamp cpufreq and ramp all 826 * fans to full speed. 827 */ 828 if (pm121_failure_state && !last_failure) { 829 for (i = 0; i < N_CONTROLS; i++) { 830 if (controls[i]) 831 wf_control_set_max(controls[i]); 832 } 833 } 834 835 /* If leaving failure mode, unclamp cpufreq and readjust 836 * all fans on next iteration 837 */ 838 if (!pm121_failure_state && last_failure) { 839 if (controls[CPUFREQ]) 840 wf_control_set_min(controls[CPUFREQ]); 841 pm121_readjust = 1; 842 } 843 844 /* Overtemp condition detected, notify and start skipping a couple 845 * ticks to let the temperature go down 846 */ 847 if (new_failure & FAILURE_OVERTEMP) { 848 wf_set_overtemp(); 849 pm121_skipping = 2; 850 } 851 852 /* We only clear the overtemp condition if overtemp is cleared 853 * _and_ no other failure is present. Since a sensor error will 854 * clear the overtemp condition (can't measure temperature) at 855 * the control loop levels, but we don't want to keep it clear 856 * here in this case 857 */ 858 if (new_failure == 0 && last_failure & FAILURE_OVERTEMP) 859 wf_clear_overtemp(); 860 } 861 862 863 static struct wf_control* pm121_register_control(struct wf_control *ct, 864 const char *match, 865 unsigned int id) 866 { 867 if (controls[id] == NULL && !strcmp(ct->name, match)) { 868 if (wf_get_control(ct) == 0) 869 controls[id] = ct; 870 } 871 return controls[id]; 872 } 873 874 static void pm121_new_control(struct wf_control *ct) 875 { 876 int all = 1; 877 878 if (pm121_all_controls_ok) 879 return; 880 881 all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all; 882 all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all; 883 all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all; 884 all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all; 885 886 if (all) 887 pm121_all_controls_ok = 1; 888 } 889 890 891 892 893 static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor, 894 const char *match, 895 struct wf_sensor **var) 896 { 897 if (*var == NULL && !strcmp(sensor->name, match)) { 898 if (wf_get_sensor(sensor) == 0) 899 *var = sensor; 900 } 901 return *var; 902 } 903 904 static void pm121_new_sensor(struct wf_sensor *sr) 905 { 906 int all = 1; 907 908 if (pm121_all_sensors_ok) 909 return; 910 911 all = pm121_register_sensor(sr, "cpu-temp", 912 &sensor_cpu_temp) && all; 913 all = pm121_register_sensor(sr, "cpu-current", 914 &sensor_cpu_current) && all; 915 all = pm121_register_sensor(sr, "cpu-voltage", 916 &sensor_cpu_voltage) && all; 917 all = pm121_register_sensor(sr, "cpu-power", 918 &sensor_cpu_power) && all; 919 all = pm121_register_sensor(sr, "hard-drive-temp", 920 &sensor_hard_drive_temp) && all; 921 all = pm121_register_sensor(sr, "optical-drive-temp", 922 &sensor_optical_drive_temp) && all; 923 all = pm121_register_sensor(sr, "incoming-air-temp", 924 &sensor_incoming_air_temp) && all; 925 all = pm121_register_sensor(sr, "north-bridge-temp", 926 &sensor_north_bridge_temp) && all; 927 all = pm121_register_sensor(sr, "gpu-temp", 928 &sensor_gpu_temp) && all; 929 930 if (all) 931 pm121_all_sensors_ok = 1; 932 } 933 934 935 936 static int pm121_notify(struct notifier_block *self, 937 unsigned long event, void *data) 938 { 939 switch (event) { 940 case WF_EVENT_NEW_CONTROL: 941 pr_debug("pm121: new control %s detected\n", 942 ((struct wf_control *)data)->name); 943 pm121_new_control(data); 944 break; 945 case WF_EVENT_NEW_SENSOR: 946 pr_debug("pm121: new sensor %s detected\n", 947 ((struct wf_sensor *)data)->name); 948 pm121_new_sensor(data); 949 break; 950 case WF_EVENT_TICK: 951 if (pm121_all_controls_ok && pm121_all_sensors_ok) 952 pm121_tick(); 953 break; 954 } 955 956 return 0; 957 } 958 959 static struct notifier_block pm121_events = { 960 .notifier_call = pm121_notify, 961 }; 962 963 static int pm121_init_pm(void) 964 { 965 const struct smu_sdbp_header *hdr; 966 967 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); 968 if (hdr != 0) { 969 struct smu_sdbp_sensortree *st = 970 (struct smu_sdbp_sensortree *)&hdr[1]; 971 pm121_mach_model = st->model_id; 972 } 973 974 pm121_connection = &pm121_connections[pm121_mach_model - 2]; 975 976 printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n", 977 pm121_mach_model); 978 979 return 0; 980 } 981 982 983 static int pm121_probe(struct platform_device *ddev) 984 { 985 wf_register_client(&pm121_events); 986 987 return 0; 988 } 989 990 static int __devexit pm121_remove(struct platform_device *ddev) 991 { 992 wf_unregister_client(&pm121_events); 993 return 0; 994 } 995 996 static struct platform_driver pm121_driver = { 997 .probe = pm121_probe, 998 .remove = __devexit_p(pm121_remove), 999 .driver = { 1000 .name = "windfarm", 1001 .bus = &platform_bus_type, 1002 }, 1003 }; 1004 1005 1006 static int __init pm121_init(void) 1007 { 1008 int rc = -ENODEV; 1009 1010 if (of_machine_is_compatible("PowerMac12,1")) 1011 rc = pm121_init_pm(); 1012 1013 if (rc == 0) { 1014 request_module("windfarm_smu_controls"); 1015 request_module("windfarm_smu_sensors"); 1016 request_module("windfarm_smu_sat"); 1017 request_module("windfarm_lm75_sensor"); 1018 request_module("windfarm_max6690_sensor"); 1019 request_module("windfarm_cpufreq_clamp"); 1020 platform_driver_register(&pm121_driver); 1021 } 1022 1023 return rc; 1024 } 1025 1026 static void __exit pm121_exit(void) 1027 { 1028 1029 platform_driver_unregister(&pm121_driver); 1030 } 1031 1032 1033 module_init(pm121_init); 1034 module_exit(pm121_exit); 1035 1036 MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>"); 1037 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)"); 1038 MODULE_LICENSE("GPL"); 1039 1040