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 <linux/of.h>
205
206 #include <asm/machdep.h>
207 #include <asm/io.h>
208 #include <asm/sections.h>
209 #include <asm/smu.h>
210
211 #include "windfarm.h"
212 #include "windfarm_pid.h"
213
214 #define VERSION "0.3"
215
216 static int pm121_mach_model; /* machine model id */
217
218 /* Controls & sensors */
219 static struct wf_sensor *sensor_cpu_power;
220 static struct wf_sensor *sensor_cpu_temp;
221 static struct wf_sensor *sensor_cpu_voltage;
222 static struct wf_sensor *sensor_cpu_current;
223 static struct wf_sensor *sensor_gpu_temp;
224 static struct wf_sensor *sensor_north_bridge_temp;
225 static struct wf_sensor *sensor_hard_drive_temp;
226 static struct wf_sensor *sensor_optical_drive_temp;
227 static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */
228
229 enum {
230 FAN_CPU,
231 FAN_HD,
232 FAN_OD,
233 CPUFREQ,
234 N_CONTROLS
235 };
236 static struct wf_control *controls[N_CONTROLS] = {};
237
238 /* Set to kick the control loop into life */
239 static int pm121_all_controls_ok, pm121_all_sensors_ok;
240 static bool pm121_started;
241
242 enum {
243 FAILURE_FAN = 1 << 0,
244 FAILURE_SENSOR = 1 << 1,
245 FAILURE_OVERTEMP = 1 << 2
246 };
247
248 /* All sys loops. Note the HD before the OD loop in order to have it
249 run before. */
250 enum {
251 LOOP_GPU, /* control = hd or cpu, but luckily,
252 it doesn't matter */
253 LOOP_HD, /* control = hd */
254 LOOP_KODIAK, /* control = hd or od */
255 LOOP_OD, /* control = od */
256 N_LOOPS
257 };
258
259 static const char *loop_names[N_LOOPS] = {
260 "GPU",
261 "HD",
262 "KODIAK",
263 "OD",
264 };
265
266 #define PM121_NUM_CONFIGS 2
267
268 static unsigned int pm121_failure_state;
269 static int pm121_readjust, pm121_skipping;
270 static bool pm121_overtemp;
271 static s32 average_power;
272
273 struct pm121_correction {
274 int offset;
275 int slope;
276 };
277
278 static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = {
279 /* FAN_OD */
280 {
281 /* MODEL 2 */
282 { .offset = -19563152,
283 .slope = 1956315
284 },
285 /* MODEL 3 */
286 { .offset = -15650652,
287 .slope = 1565065
288 },
289 },
290 /* FAN_HD */
291 {
292 /* MODEL 2 */
293 { .offset = -15650652,
294 .slope = 1565065
295 },
296 /* MODEL 3 */
297 { .offset = -19563152,
298 .slope = 1956315
299 },
300 },
301 /* FAN_CPU */
302 {
303 /* MODEL 2 */
304 { .offset = -25431900,
305 .slope = 2543190
306 },
307 /* MODEL 3 */
308 { .offset = -15650652,
309 .slope = 1565065
310 },
311 },
312 /* CPUFREQ has no correction (and is not implemented at all) */
313 };
314
315 struct pm121_connection {
316 unsigned int control_id;
317 unsigned int ref_id;
318 struct pm121_correction correction;
319 };
320
321 static struct pm121_connection pm121_connections[] = {
322 /* MODEL 2 */
323 { .control_id = FAN_CPU,
324 .ref_id = FAN_OD,
325 { .offset = -32768000,
326 .slope = 65536
327 }
328 },
329 /* MODEL 3 */
330 { .control_id = FAN_OD,
331 .ref_id = FAN_HD,
332 { .offset = -32768000,
333 .slope = 65536
334 }
335 },
336 };
337
338 /* pointer to the current model connection */
339 static struct pm121_connection *pm121_connection;
340
341 /*
342 * ****** System Fans Control Loop ******
343 *
344 */
345
346 /* Since each loop handles only one control and we want to avoid
347 * writing virtual control, we store the control correction with the
348 * loop params. Some data are not set, there are common to all loop
349 * and thus, hardcoded.
350 */
351 struct pm121_sys_param {
352 /* purely informative since we use mach_model-2 as index */
353 int model_id;
354 struct wf_sensor **sensor; /* use sensor_id instead ? */
355 s32 gp, itarget;
356 unsigned int control_id;
357 };
358
359 static struct pm121_sys_param
360 pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = {
361 /* GPU Fan control loop */
362 {
363 { .model_id = 2,
364 .sensor = &sensor_gpu_temp,
365 .gp = 0x002A6666,
366 .itarget = 0x5A0000,
367 .control_id = FAN_HD,
368 },
369 { .model_id = 3,
370 .sensor = &sensor_gpu_temp,
371 .gp = 0x0010CCCC,
372 .itarget = 0x500000,
373 .control_id = FAN_CPU,
374 },
375 },
376 /* HD Fan control loop */
377 {
378 { .model_id = 2,
379 .sensor = &sensor_hard_drive_temp,
380 .gp = 0x002D70A3,
381 .itarget = 0x370000,
382 .control_id = FAN_HD,
383 },
384 { .model_id = 3,
385 .sensor = &sensor_hard_drive_temp,
386 .gp = 0x002170A3,
387 .itarget = 0x370000,
388 .control_id = FAN_HD,
389 },
390 },
391 /* KODIAK Fan control loop */
392 {
393 { .model_id = 2,
394 .sensor = &sensor_north_bridge_temp,
395 .gp = 0x003BD70A,
396 .itarget = 0x550000,
397 .control_id = FAN_OD,
398 },
399 { .model_id = 3,
400 .sensor = &sensor_north_bridge_temp,
401 .gp = 0x0030F5C2,
402 .itarget = 0x550000,
403 .control_id = FAN_HD,
404 },
405 },
406 /* OD Fan control loop */
407 {
408 { .model_id = 2,
409 .sensor = &sensor_optical_drive_temp,
410 .gp = 0x001FAE14,
411 .itarget = 0x320000,
412 .control_id = FAN_OD,
413 },
414 { .model_id = 3,
415 .sensor = &sensor_optical_drive_temp,
416 .gp = 0x001FAE14,
417 .itarget = 0x320000,
418 .control_id = FAN_OD,
419 },
420 },
421 };
422
423 /* the hardcoded values */
424 #define PM121_SYS_GD 0x00000000
425 #define PM121_SYS_GR 0x00019999
426 #define PM121_SYS_HISTORY_SIZE 2
427 #define PM121_SYS_INTERVAL 5
428
429 /* State data used by the system fans control loop
430 */
431 struct pm121_sys_state {
432 int ticks;
433 s32 setpoint;
434 struct wf_pid_state pid;
435 };
436
437 static struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
438
439 /*
440 * ****** CPU Fans Control Loop ******
441 *
442 */
443
444 #define PM121_CPU_INTERVAL 1
445
446 /* State data used by the cpu fans control loop
447 */
448 struct pm121_cpu_state {
449 int ticks;
450 s32 setpoint;
451 struct wf_cpu_pid_state pid;
452 };
453
454 static struct pm121_cpu_state *pm121_cpu_state;
455
456
457
458 /*
459 * ***** Implementation *****
460 *
461 */
462
463 /* correction the value using the output-low-bound correction algo */
pm121_correct(s32 new_setpoint,unsigned int control_id,s32 min)464 static s32 pm121_correct(s32 new_setpoint,
465 unsigned int control_id,
466 s32 min)
467 {
468 s32 new_min;
469 struct pm121_correction *correction;
470 correction = &corrections[control_id][pm121_mach_model - 2];
471
472 new_min = (average_power * correction->slope) >> 16;
473 new_min += correction->offset;
474 new_min = (new_min >> 16) + min;
475
476 return max3(new_setpoint, new_min, 0);
477 }
478
pm121_connect(unsigned int control_id,s32 setpoint)479 static s32 pm121_connect(unsigned int control_id, s32 setpoint)
480 {
481 s32 new_min, value, new_setpoint;
482
483 if (pm121_connection->control_id == control_id) {
484 controls[control_id]->ops->get_value(controls[control_id],
485 &value);
486 new_min = value * pm121_connection->correction.slope;
487 new_min += pm121_connection->correction.offset;
488 if (new_min > 0) {
489 new_setpoint = max(setpoint, (new_min >> 16));
490 if (new_setpoint != setpoint) {
491 pr_debug("pm121: %s depending on %s, "
492 "corrected from %d to %d RPM\n",
493 controls[control_id]->name,
494 controls[pm121_connection->ref_id]->name,
495 (int) setpoint, (int) new_setpoint);
496 }
497 } else
498 new_setpoint = setpoint;
499 }
500 /* no connection */
501 else
502 new_setpoint = setpoint;
503
504 return new_setpoint;
505 }
506
507 /* FAN LOOPS */
pm121_create_sys_fans(int loop_id)508 static void pm121_create_sys_fans(int loop_id)
509 {
510 struct pm121_sys_param *param = NULL;
511 struct wf_pid_param pid_param;
512 struct wf_control *control = NULL;
513 int i;
514
515 /* First, locate the params for this model */
516 for (i = 0; i < PM121_NUM_CONFIGS; i++) {
517 if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) {
518 param = &(pm121_sys_all_params[loop_id][i]);
519 break;
520 }
521 }
522
523 /* No params found, put fans to max */
524 if (param == NULL) {
525 printk(KERN_WARNING "pm121: %s fan config not found "
526 " for this machine model\n",
527 loop_names[loop_id]);
528 goto fail;
529 }
530
531 control = controls[param->control_id];
532
533 /* Alloc & initialize state */
534 pm121_sys_state[loop_id] = kmalloc_obj(struct pm121_sys_state);
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
pm121_sys_fans_tick(int loop_id)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 */
pm121_create_cpu_fans(void)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) {
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_obj(struct pm121_cpu_state);
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(" ttarget=%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
pm121_cpu_fans_tick(struct pm121_cpu_state * st)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
pm121_tick(void)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 = true;
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 pm121_overtemp = true;
851 }
852
853 /* We only clear the overtemp condition if overtemp is cleared
854 * _and_ no other failure is present. Since a sensor error will
855 * clear the overtemp condition (can't measure temperature) at
856 * the control loop levels, but we don't want to keep it clear
857 * here in this case
858 */
859 if (!pm121_failure_state && pm121_overtemp) {
860 wf_clear_overtemp();
861 pm121_overtemp = false;
862 }
863 }
864
865
pm121_register_control(struct wf_control * ct,const char * match,unsigned int id)866 static struct wf_control* pm121_register_control(struct wf_control *ct,
867 const char *match,
868 unsigned int id)
869 {
870 if (controls[id] == NULL && !strcmp(ct->name, match)) {
871 if (wf_get_control(ct) == 0)
872 controls[id] = ct;
873 }
874 return controls[id];
875 }
876
pm121_new_control(struct wf_control * ct)877 static void pm121_new_control(struct wf_control *ct)
878 {
879 int all = 1;
880
881 if (pm121_all_controls_ok)
882 return;
883
884 all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all;
885 all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all;
886 all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all;
887 all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all;
888
889 if (all)
890 pm121_all_controls_ok = 1;
891 }
892
893
894
895
pm121_register_sensor(struct wf_sensor * sensor,const char * match,struct wf_sensor ** var)896 static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor,
897 const char *match,
898 struct wf_sensor **var)
899 {
900 if (*var == NULL && !strcmp(sensor->name, match)) {
901 if (wf_get_sensor(sensor) == 0)
902 *var = sensor;
903 }
904 return *var;
905 }
906
pm121_new_sensor(struct wf_sensor * sr)907 static void pm121_new_sensor(struct wf_sensor *sr)
908 {
909 int all = 1;
910
911 if (pm121_all_sensors_ok)
912 return;
913
914 all = pm121_register_sensor(sr, "cpu-temp",
915 &sensor_cpu_temp) && all;
916 all = pm121_register_sensor(sr, "cpu-current",
917 &sensor_cpu_current) && all;
918 all = pm121_register_sensor(sr, "cpu-voltage",
919 &sensor_cpu_voltage) && all;
920 all = pm121_register_sensor(sr, "cpu-power",
921 &sensor_cpu_power) && all;
922 all = pm121_register_sensor(sr, "hard-drive-temp",
923 &sensor_hard_drive_temp) && all;
924 all = pm121_register_sensor(sr, "optical-drive-temp",
925 &sensor_optical_drive_temp) && all;
926 all = pm121_register_sensor(sr, "incoming-air-temp",
927 &sensor_incoming_air_temp) && all;
928 all = pm121_register_sensor(sr, "north-bridge-temp",
929 &sensor_north_bridge_temp) && all;
930 all = pm121_register_sensor(sr, "gpu-temp",
931 &sensor_gpu_temp) && all;
932
933 if (all)
934 pm121_all_sensors_ok = 1;
935 }
936
937
938
pm121_notify(struct notifier_block * self,unsigned long event,void * data)939 static int pm121_notify(struct notifier_block *self,
940 unsigned long event, void *data)
941 {
942 switch (event) {
943 case WF_EVENT_NEW_CONTROL:
944 pr_debug("pm121: new control %s detected\n",
945 ((struct wf_control *)data)->name);
946 pm121_new_control(data);
947 break;
948 case WF_EVENT_NEW_SENSOR:
949 pr_debug("pm121: new sensor %s detected\n",
950 ((struct wf_sensor *)data)->name);
951 pm121_new_sensor(data);
952 break;
953 case WF_EVENT_TICK:
954 if (pm121_all_controls_ok && pm121_all_sensors_ok)
955 pm121_tick();
956 break;
957 }
958
959 return 0;
960 }
961
962 static struct notifier_block pm121_events = {
963 .notifier_call = pm121_notify,
964 };
965
pm121_init_pm(void)966 static int pm121_init_pm(void)
967 {
968 const struct smu_sdbp_header *hdr;
969
970 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
971 if (hdr) {
972 struct smu_sdbp_sensortree *st =
973 (struct smu_sdbp_sensortree *)&hdr[1];
974 pm121_mach_model = st->model_id;
975 }
976
977 pm121_connection = &pm121_connections[pm121_mach_model - 2];
978
979 printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n",
980 pm121_mach_model);
981
982 return 0;
983 }
984
985
pm121_probe(struct platform_device * ddev)986 static int pm121_probe(struct platform_device *ddev)
987 {
988 wf_register_client(&pm121_events);
989
990 return 0;
991 }
992
pm121_remove(struct platform_device * ddev)993 static void pm121_remove(struct platform_device *ddev)
994 {
995 wf_unregister_client(&pm121_events);
996 }
997
998 static struct platform_driver pm121_driver = {
999 .probe = pm121_probe,
1000 .remove = pm121_remove,
1001 .driver = {
1002 .name = "windfarm",
1003 .bus = &platform_bus_type,
1004 },
1005 };
1006
1007
pm121_init(void)1008 static int __init pm121_init(void)
1009 {
1010 int rc = -ENODEV;
1011
1012 if (of_machine_is_compatible("PowerMac12,1"))
1013 rc = pm121_init_pm();
1014
1015 if (rc == 0) {
1016 request_module("windfarm_smu_controls");
1017 request_module("windfarm_smu_sensors");
1018 request_module("windfarm_smu_sat");
1019 request_module("windfarm_lm75_sensor");
1020 request_module("windfarm_max6690_sensor");
1021 request_module("windfarm_cpufreq_clamp");
1022 platform_driver_register(&pm121_driver);
1023 }
1024
1025 return rc;
1026 }
1027
pm121_exit(void)1028 static void __exit pm121_exit(void)
1029 {
1030
1031 platform_driver_unregister(&pm121_driver);
1032 }
1033
1034
1035 module_init(pm121_init);
1036 module_exit(pm121_exit);
1037
1038 MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>");
1039 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
1040 MODULE_LICENSE("GPL");
1041
1042