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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops
4 *
5 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
6 * <benh@kernel.crashing.org>
7 *
8 * The algorithm used is the PID control algorithm, used the same
9 * way the published Darwin code does, using the same values that
10 * are present in the Darwin 8.2 snapshot property lists (note however
11 * that none of the code has been re-used, it's a complete re-implementation
12 *
13 * The various control loops found in Darwin config file are:
14 *
15 * PowerMac9,1
16 * ===========
17 *
18 * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't
19 * try to play with other control loops fans). Drive bay is rather basic PID
20 * with one sensor and one fan. Slots area is a bit different as the Darwin
21 * driver is supposed to be capable of working in a special "AGP" mode which
22 * involves the presence of an AGP sensor and an AGP fan (possibly on the
23 * AGP card itself). I can't deal with that special mode as I don't have
24 * access to those additional sensor/fans for now (though ultimately, it would
25 * be possible to add sensor objects for them) so I'm only implementing the
26 * basic PCI slot control loop
27 */
28
29#include <linux/types.h>
30#include <linux/errno.h>
31#include <linux/kernel.h>
32#include <linux/delay.h>
33#include <linux/slab.h>
34#include <linux/init.h>
35#include <linux/spinlock.h>
36#include <linux/wait.h>
37#include <linux/kmod.h>
38#include <linux/device.h>
39#include <linux/platform_device.h>
40#include <linux/of.h>
41
42#include <asm/machdep.h>
43#include <asm/io.h>
44#include <asm/sections.h>
45#include <asm/smu.h>
46
47#include "windfarm.h"
48#include "windfarm_pid.h"
49
50#define VERSION "0.4"
51
52#undef DEBUG
53
54#ifdef DEBUG
55#define DBG(args...) printk(args)
56#else
57#define DBG(args...) do { } while(0)
58#endif
59
60/* define this to force CPU overtemp to 74 degree, useful for testing
61 * the overtemp code
62 */
63#undef HACKED_OVERTEMP
64
65/* Controls & sensors */
66static struct wf_sensor *sensor_cpu_power;
67static struct wf_sensor *sensor_cpu_temp;
68static struct wf_sensor *sensor_hd_temp;
69static struct wf_sensor *sensor_slots_power;
70static struct wf_control *fan_cpu_main;
71static struct wf_control *fan_cpu_second;
72static struct wf_control *fan_cpu_third;
73static struct wf_control *fan_hd;
74static struct wf_control *fan_slots;
75static struct wf_control *cpufreq_clamp;
76
77/* Set to kick the control loop into life */
78static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok;
79static bool wf_smu_started;
80static bool wf_smu_overtemp;
81
82/* Failure handling.. could be nicer */
83#define FAILURE_FAN 0x01
84#define FAILURE_SENSOR 0x02
85#define FAILURE_OVERTEMP 0x04
86
87static unsigned int wf_smu_failure_state;
88static int wf_smu_readjust, wf_smu_skipping;
89
90/*
91 * ****** CPU Fans Control Loop ******
92 *
93 */
94
95
96#define WF_SMU_CPU_FANS_INTERVAL 1
97#define WF_SMU_CPU_FANS_MAX_HISTORY 16
98
99/* State data used by the cpu fans control loop
100 */
101struct wf_smu_cpu_fans_state {
102 int ticks;
103 s32 cpu_setpoint;
104 struct wf_cpu_pid_state pid;
105};
106
107static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
108
109
110
111/*
112 * ****** Drive Fan Control Loop ******
113 *
114 */
115
116struct wf_smu_drive_fans_state {
117 int ticks;
118 s32 setpoint;
119 struct wf_pid_state pid;
120};
121
122static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
123
124/*
125 * ****** Slots Fan Control Loop ******
126 *
127 */
128
129struct wf_smu_slots_fans_state {
130 int ticks;
131 s32 setpoint;
132 struct wf_pid_state pid;
133};
134
135static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
136
137/*
138 * ***** Implementation *****
139 *
140 */
141
142
143static void wf_smu_create_cpu_fans(void)
144{
145 struct wf_cpu_pid_param pid_param;
146 const struct smu_sdbp_header *hdr;
147 struct smu_sdbp_cpupiddata *piddata;
148 struct smu_sdbp_fvt *fvt;
149 s32 tmax, tdelta, maxpow, powadj;
150
151 /* First, locate the PID params in SMU SBD */
152 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
153 if (!hdr) {
154 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
155 "max fan speed\n");
156 goto fail;
157 }
158 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
159
160 /* Get the FVT params for operating point 0 (the only supported one
161 * for now) in order to get tmax
162 */
163 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
164 if (hdr) {
165 fvt = (struct smu_sdbp_fvt *)&hdr[1];
166 tmax = ((s32)fvt->maxtemp) << 16;
167 } else
168 tmax = 0x5e0000; /* 94 degree default */
169
170 /* Alloc & initialize state */
171 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
172 GFP_KERNEL);
173 if (wf_smu_cpu_fans == NULL)
174 goto fail;
175 wf_smu_cpu_fans->ticks = 1;
176
177 /* Fill PID params */
178 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
179 pid_param.history_len = piddata->history_len;
180 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
181 printk(KERN_WARNING "windfarm: History size overflow on "
182 "CPU control loop (%d)\n", piddata->history_len);
183 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
184 }
185 pid_param.gd = piddata->gd;
186 pid_param.gp = piddata->gp;
187 pid_param.gr = piddata->gr / pid_param.history_len;
188
189 tdelta = ((s32)piddata->target_temp_delta) << 16;
190 maxpow = ((s32)piddata->max_power) << 16;
191 powadj = ((s32)piddata->power_adj) << 16;
192
193 pid_param.tmax = tmax;
194 pid_param.ttarget = tmax - tdelta;
195 pid_param.pmaxadj = maxpow - powadj;
196
197 pid_param.min = wf_control_get_min(fan_cpu_main);
198 pid_param.max = wf_control_get_max(fan_cpu_main);
199
200 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
201
202 DBG("wf: CPU Fan control initialized.\n");
203 DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
204 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
205 pid_param.min, pid_param.max);
206
207 return;
208
209 fail:
210 printk(KERN_WARNING "windfarm: CPU fan config not found\n"
211 "for this machine model, max fan speed\n");
212
213 if (cpufreq_clamp)
214 wf_control_set_max(cpufreq_clamp);
215 if (fan_cpu_main)
216 wf_control_set_max(fan_cpu_main);
217}
218
219static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
220{
221 s32 new_setpoint, temp, power;
222 int rc;
223
224 if (--st->ticks != 0) {
225 if (wf_smu_readjust)
226 goto readjust;
227 return;
228 }
229 st->ticks = WF_SMU_CPU_FANS_INTERVAL;
230
231 rc = wf_sensor_get(sensor_cpu_temp, &temp);
232 if (rc) {
233 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
234 rc);
235 wf_smu_failure_state |= FAILURE_SENSOR;
236 return;
237 }
238
239 rc = wf_sensor_get(sensor_cpu_power, &power);
240 if (rc) {
241 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
242 rc);
243 wf_smu_failure_state |= FAILURE_SENSOR;
244 return;
245 }
246
247 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
248 FIX32TOPRINT(temp), FIX32TOPRINT(power));
249
250#ifdef HACKED_OVERTEMP
251 if (temp > 0x4a0000)
252 wf_smu_failure_state |= FAILURE_OVERTEMP;
253#else
254 if (temp > st->pid.param.tmax)
255 wf_smu_failure_state |= FAILURE_OVERTEMP;
256#endif
257 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
258
259 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
260
261 if (st->cpu_setpoint == new_setpoint)
262 return;
263 st->cpu_setpoint = new_setpoint;
264 readjust:
265 if (fan_cpu_main && wf_smu_failure_state == 0) {
266 rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
267 if (rc) {
268 printk(KERN_WARNING "windfarm: CPU main fan"
269 " error %d\n", rc);
270 wf_smu_failure_state |= FAILURE_FAN;
271 }
272 }
273 if (fan_cpu_second && wf_smu_failure_state == 0) {
274 rc = wf_control_set(fan_cpu_second, st->cpu_setpoint);
275 if (rc) {
276 printk(KERN_WARNING "windfarm: CPU second fan"
277 " error %d\n", rc);
278 wf_smu_failure_state |= FAILURE_FAN;
279 }
280 }
281 if (fan_cpu_third && wf_smu_failure_state == 0) {
282 rc = wf_control_set(fan_cpu_third, st->cpu_setpoint);
283 if (rc) {
284 printk(KERN_WARNING "windfarm: CPU third fan"
285 " error %d\n", rc);
286 wf_smu_failure_state |= FAILURE_FAN;
287 }
288 }
289}
290
291static void wf_smu_create_drive_fans(void)
292{
293 struct wf_pid_param param = {
294 .interval = 5,
295 .history_len = 2,
296 .gd = 0x01e00000,
297 .gp = 0x00500000,
298 .gr = 0x00000000,
299 .itarget = 0x00200000,
300 };
301
302 /* Alloc & initialize state */
303 wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
304 GFP_KERNEL);
305 if (wf_smu_drive_fans == NULL) {
306 printk(KERN_WARNING "windfarm: Memory allocation error"
307 " max fan speed\n");
308 goto fail;
309 }
310 wf_smu_drive_fans->ticks = 1;
311
312 /* Fill PID params */
313 param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
314 param.min = wf_control_get_min(fan_hd);
315 param.max = wf_control_get_max(fan_hd);
316 wf_pid_init(&wf_smu_drive_fans->pid, ¶m);
317
318 DBG("wf: Drive Fan control initialized.\n");
319 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
320 FIX32TOPRINT(param.itarget), param.min, param.max);
321 return;
322
323 fail:
324 if (fan_hd)
325 wf_control_set_max(fan_hd);
326}
327
328static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
329{
330 s32 new_setpoint, temp;
331 int rc;
332
333 if (--st->ticks != 0) {
334 if (wf_smu_readjust)
335 goto readjust;
336 return;
337 }
338 st->ticks = st->pid.param.interval;
339
340 rc = wf_sensor_get(sensor_hd_temp, &temp);
341 if (rc) {
342 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
343 rc);
344 wf_smu_failure_state |= FAILURE_SENSOR;
345 return;
346 }
347
348 DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
349 FIX32TOPRINT(temp));
350
351 if (temp > (st->pid.param.itarget + 0x50000))
352 wf_smu_failure_state |= FAILURE_OVERTEMP;
353
354 new_setpoint = wf_pid_run(&st->pid, temp);
355
356 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
357
358 if (st->setpoint == new_setpoint)
359 return;
360 st->setpoint = new_setpoint;
361 readjust:
362 if (fan_hd && wf_smu_failure_state == 0) {
363 rc = wf_control_set(fan_hd, st->setpoint);
364 if (rc) {
365 printk(KERN_WARNING "windfarm: HD fan error %d\n",
366 rc);
367 wf_smu_failure_state |= FAILURE_FAN;
368 }
369 }
370}
371
372static void wf_smu_create_slots_fans(void)
373{
374 struct wf_pid_param param = {
375 .interval = 1,
376 .history_len = 8,
377 .gd = 0x00000000,
378 .gp = 0x00000000,
379 .gr = 0x00020000,
380 .itarget = 0x00000000
381 };
382
383 /* Alloc & initialize state */
384 wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
385 GFP_KERNEL);
386 if (wf_smu_slots_fans == NULL) {
387 printk(KERN_WARNING "windfarm: Memory allocation error"
388 " max fan speed\n");
389 goto fail;
390 }
391 wf_smu_slots_fans->ticks = 1;
392
393 /* Fill PID params */
394 param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
395 param.min = wf_control_get_min(fan_slots);
396 param.max = wf_control_get_max(fan_slots);
397 wf_pid_init(&wf_smu_slots_fans->pid, ¶m);
398
399 DBG("wf: Slots Fan control initialized.\n");
400 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
401 FIX32TOPRINT(param.itarget), param.min, param.max);
402 return;
403
404 fail:
405 if (fan_slots)
406 wf_control_set_max(fan_slots);
407}
408
409static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
410{
411 s32 new_setpoint, power;
412 int rc;
413
414 if (--st->ticks != 0) {
415 if (wf_smu_readjust)
416 goto readjust;
417 return;
418 }
419 st->ticks = st->pid.param.interval;
420
421 rc = wf_sensor_get(sensor_slots_power, &power);
422 if (rc) {
423 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
424 rc);
425 wf_smu_failure_state |= FAILURE_SENSOR;
426 return;
427 }
428
429 DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
430 FIX32TOPRINT(power));
431
432#if 0 /* Check what makes a good overtemp condition */
433 if (power > (st->pid.param.itarget + 0x50000))
434 wf_smu_failure_state |= FAILURE_OVERTEMP;
435#endif
436
437 new_setpoint = wf_pid_run(&st->pid, power);
438
439 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
440
441 if (st->setpoint == new_setpoint)
442 return;
443 st->setpoint = new_setpoint;
444 readjust:
445 if (fan_slots && wf_smu_failure_state == 0) {
446 rc = wf_control_set(fan_slots, st->setpoint);
447 if (rc) {
448 printk(KERN_WARNING "windfarm: Slots fan error %d\n",
449 rc);
450 wf_smu_failure_state |= FAILURE_FAN;
451 }
452 }
453}
454
455
456/*
457 * ****** Setup / Init / Misc ... ******
458 *
459 */
460
461static void wf_smu_tick(void)
462{
463 unsigned int last_failure = wf_smu_failure_state;
464 unsigned int new_failure;
465
466 if (!wf_smu_started) {
467 DBG("wf: creating control loops !\n");
468 wf_smu_create_drive_fans();
469 wf_smu_create_slots_fans();
470 wf_smu_create_cpu_fans();
471 wf_smu_started = true;
472 }
473
474 /* Skipping ticks */
475 if (wf_smu_skipping && --wf_smu_skipping)
476 return;
477
478 wf_smu_failure_state = 0;
479 if (wf_smu_drive_fans)
480 wf_smu_drive_fans_tick(wf_smu_drive_fans);
481 if (wf_smu_slots_fans)
482 wf_smu_slots_fans_tick(wf_smu_slots_fans);
483 if (wf_smu_cpu_fans)
484 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
485
486 wf_smu_readjust = 0;
487 new_failure = wf_smu_failure_state & ~last_failure;
488
489 /* If entering failure mode, clamp cpufreq and ramp all
490 * fans to full speed.
491 */
492 if (wf_smu_failure_state && !last_failure) {
493 if (cpufreq_clamp)
494 wf_control_set_max(cpufreq_clamp);
495 if (fan_cpu_main)
496 wf_control_set_max(fan_cpu_main);
497 if (fan_cpu_second)
498 wf_control_set_max(fan_cpu_second);
499 if (fan_cpu_third)
500 wf_control_set_max(fan_cpu_third);
501 if (fan_hd)
502 wf_control_set_max(fan_hd);
503 if (fan_slots)
504 wf_control_set_max(fan_slots);
505 }
506
507 /* If leaving failure mode, unclamp cpufreq and readjust
508 * all fans on next iteration
509 */
510 if (!wf_smu_failure_state && last_failure) {
511 if (cpufreq_clamp)
512 wf_control_set_min(cpufreq_clamp);
513 wf_smu_readjust = 1;
514 }
515
516 /* Overtemp condition detected, notify and start skipping a couple
517 * ticks to let the temperature go down
518 */
519 if (new_failure & FAILURE_OVERTEMP) {
520 wf_set_overtemp();
521 wf_smu_skipping = 2;
522 wf_smu_overtemp = true;
523 }
524
525 /* We only clear the overtemp condition if overtemp is cleared
526 * _and_ no other failure is present. Since a sensor error will
527 * clear the overtemp condition (can't measure temperature) at
528 * the control loop levels, but we don't want to keep it clear
529 * here in this case
530 */
531 if (!wf_smu_failure_state && wf_smu_overtemp) {
532 wf_clear_overtemp();
533 wf_smu_overtemp = false;
534 }
535}
536
537
538static void wf_smu_new_control(struct wf_control *ct)
539{
540 if (wf_smu_all_controls_ok)
541 return;
542
543 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
544 if (wf_get_control(ct) == 0)
545 fan_cpu_main = ct;
546 }
547
548 if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
549 if (wf_get_control(ct) == 0)
550 fan_cpu_second = ct;
551 }
552
553 if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
554 if (wf_get_control(ct) == 0)
555 fan_cpu_third = ct;
556 }
557
558 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
559 if (wf_get_control(ct) == 0)
560 cpufreq_clamp = ct;
561 }
562
563 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
564 if (wf_get_control(ct) == 0)
565 fan_hd = ct;
566 }
567
568 if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
569 if (wf_get_control(ct) == 0)
570 fan_slots = ct;
571 }
572
573 if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
574 fan_slots && cpufreq_clamp)
575 wf_smu_all_controls_ok = 1;
576}
577
578static void wf_smu_new_sensor(struct wf_sensor *sr)
579{
580 if (wf_smu_all_sensors_ok)
581 return;
582
583 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
584 if (wf_get_sensor(sr) == 0)
585 sensor_cpu_power = sr;
586 }
587
588 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
589 if (wf_get_sensor(sr) == 0)
590 sensor_cpu_temp = sr;
591 }
592
593 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
594 if (wf_get_sensor(sr) == 0)
595 sensor_hd_temp = sr;
596 }
597
598 if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
599 if (wf_get_sensor(sr) == 0)
600 sensor_slots_power = sr;
601 }
602
603 if (sensor_cpu_power && sensor_cpu_temp &&
604 sensor_hd_temp && sensor_slots_power)
605 wf_smu_all_sensors_ok = 1;
606}
607
608
609static int wf_smu_notify(struct notifier_block *self,
610 unsigned long event, void *data)
611{
612 switch(event) {
613 case WF_EVENT_NEW_CONTROL:
614 DBG("wf: new control %s detected\n",
615 ((struct wf_control *)data)->name);
616 wf_smu_new_control(data);
617 wf_smu_readjust = 1;
618 break;
619 case WF_EVENT_NEW_SENSOR:
620 DBG("wf: new sensor %s detected\n",
621 ((struct wf_sensor *)data)->name);
622 wf_smu_new_sensor(data);
623 break;
624 case WF_EVENT_TICK:
625 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
626 wf_smu_tick();
627 }
628
629 return 0;
630}
631
632static struct notifier_block wf_smu_events = {
633 .notifier_call = wf_smu_notify,
634};
635
636static int wf_init_pm(void)
637{
638 printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
639
640 return 0;
641}
642
643static int wf_smu_probe(struct platform_device *ddev)
644{
645 wf_register_client(&wf_smu_events);
646
647 return 0;
648}
649
650static int wf_smu_remove(struct platform_device *ddev)
651{
652 wf_unregister_client(&wf_smu_events);
653
654 /* XXX We don't have yet a guarantee that our callback isn't
655 * in progress when returning from wf_unregister_client, so
656 * we add an arbitrary delay. I'll have to fix that in the core
657 */
658 msleep(1000);
659
660 /* Release all sensors */
661 /* One more crappy race: I don't think we have any guarantee here
662 * that the attribute callback won't race with the sensor beeing
663 * disposed of, and I'm not 100% certain what best way to deal
664 * with that except by adding locks all over... I'll do that
665 * eventually but heh, who ever rmmod this module anyway ?
666 */
667 if (sensor_cpu_power)
668 wf_put_sensor(sensor_cpu_power);
669 if (sensor_cpu_temp)
670 wf_put_sensor(sensor_cpu_temp);
671 if (sensor_hd_temp)
672 wf_put_sensor(sensor_hd_temp);
673 if (sensor_slots_power)
674 wf_put_sensor(sensor_slots_power);
675
676 /* Release all controls */
677 if (fan_cpu_main)
678 wf_put_control(fan_cpu_main);
679 if (fan_cpu_second)
680 wf_put_control(fan_cpu_second);
681 if (fan_cpu_third)
682 wf_put_control(fan_cpu_third);
683 if (fan_hd)
684 wf_put_control(fan_hd);
685 if (fan_slots)
686 wf_put_control(fan_slots);
687 if (cpufreq_clamp)
688 wf_put_control(cpufreq_clamp);
689
690 /* Destroy control loops state structures */
691 kfree(wf_smu_slots_fans);
692 kfree(wf_smu_drive_fans);
693 kfree(wf_smu_cpu_fans);
694
695 return 0;
696}
697
698static struct platform_driver wf_smu_driver = {
699 .probe = wf_smu_probe,
700 .remove = wf_smu_remove,
701 .driver = {
702 .name = "windfarm",
703 },
704};
705
706
707static int __init wf_smu_init(void)
708{
709 int rc = -ENODEV;
710
711 if (of_machine_is_compatible("PowerMac9,1"))
712 rc = wf_init_pm();
713
714 if (rc == 0) {
715#ifdef MODULE
716 request_module("windfarm_smu_controls");
717 request_module("windfarm_smu_sensors");
718 request_module("windfarm_lm75_sensor");
719 request_module("windfarm_cpufreq_clamp");
720
721#endif /* MODULE */
722 platform_driver_register(&wf_smu_driver);
723 }
724
725 return rc;
726}
727
728static void __exit wf_smu_exit(void)
729{
730
731 platform_driver_unregister(&wf_smu_driver);
732}
733
734
735module_init(wf_smu_init);
736module_exit(wf_smu_exit);
737
738MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
739MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
740MODULE_LICENSE("GPL");
741
742MODULE_ALIAS("platform:windfarm");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops
4 *
5 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
6 * <benh@kernel.crashing.org>
7 *
8 * The algorithm used is the PID control algorithm, used the same
9 * way the published Darwin code does, using the same values that
10 * are present in the Darwin 8.2 snapshot property lists (note however
11 * that none of the code has been re-used, it's a complete re-implementation
12 *
13 * The various control loops found in Darwin config file are:
14 *
15 * PowerMac9,1
16 * ===========
17 *
18 * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't
19 * try to play with other control loops fans). Drive bay is rather basic PID
20 * with one sensor and one fan. Slots area is a bit different as the Darwin
21 * driver is supposed to be capable of working in a special "AGP" mode which
22 * involves the presence of an AGP sensor and an AGP fan (possibly on the
23 * AGP card itself). I can't deal with that special mode as I don't have
24 * access to those additional sensor/fans for now (though ultimately, it would
25 * be possible to add sensor objects for them) so I'm only implementing the
26 * basic PCI slot control loop
27 */
28
29#include <linux/types.h>
30#include <linux/errno.h>
31#include <linux/kernel.h>
32#include <linux/delay.h>
33#include <linux/slab.h>
34#include <linux/init.h>
35#include <linux/spinlock.h>
36#include <linux/wait.h>
37#include <linux/kmod.h>
38#include <linux/device.h>
39#include <linux/platform_device.h>
40#include <asm/prom.h>
41#include <asm/machdep.h>
42#include <asm/io.h>
43#include <asm/sections.h>
44#include <asm/smu.h>
45
46#include "windfarm.h"
47#include "windfarm_pid.h"
48
49#define VERSION "0.4"
50
51#undef DEBUG
52
53#ifdef DEBUG
54#define DBG(args...) printk(args)
55#else
56#define DBG(args...) do { } while(0)
57#endif
58
59/* define this to force CPU overtemp to 74 degree, useful for testing
60 * the overtemp code
61 */
62#undef HACKED_OVERTEMP
63
64/* Controls & sensors */
65static struct wf_sensor *sensor_cpu_power;
66static struct wf_sensor *sensor_cpu_temp;
67static struct wf_sensor *sensor_hd_temp;
68static struct wf_sensor *sensor_slots_power;
69static struct wf_control *fan_cpu_main;
70static struct wf_control *fan_cpu_second;
71static struct wf_control *fan_cpu_third;
72static struct wf_control *fan_hd;
73static struct wf_control *fan_slots;
74static struct wf_control *cpufreq_clamp;
75
76/* Set to kick the control loop into life */
77static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok;
78static bool wf_smu_started;
79static bool wf_smu_overtemp;
80
81/* Failure handling.. could be nicer */
82#define FAILURE_FAN 0x01
83#define FAILURE_SENSOR 0x02
84#define FAILURE_OVERTEMP 0x04
85
86static unsigned int wf_smu_failure_state;
87static int wf_smu_readjust, wf_smu_skipping;
88
89/*
90 * ****** CPU Fans Control Loop ******
91 *
92 */
93
94
95#define WF_SMU_CPU_FANS_INTERVAL 1
96#define WF_SMU_CPU_FANS_MAX_HISTORY 16
97
98/* State data used by the cpu fans control loop
99 */
100struct wf_smu_cpu_fans_state {
101 int ticks;
102 s32 cpu_setpoint;
103 struct wf_cpu_pid_state pid;
104};
105
106static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
107
108
109
110/*
111 * ****** Drive Fan Control Loop ******
112 *
113 */
114
115struct wf_smu_drive_fans_state {
116 int ticks;
117 s32 setpoint;
118 struct wf_pid_state pid;
119};
120
121static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
122
123/*
124 * ****** Slots Fan Control Loop ******
125 *
126 */
127
128struct wf_smu_slots_fans_state {
129 int ticks;
130 s32 setpoint;
131 struct wf_pid_state pid;
132};
133
134static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
135
136/*
137 * ***** Implementation *****
138 *
139 */
140
141
142static void wf_smu_create_cpu_fans(void)
143{
144 struct wf_cpu_pid_param pid_param;
145 const struct smu_sdbp_header *hdr;
146 struct smu_sdbp_cpupiddata *piddata;
147 struct smu_sdbp_fvt *fvt;
148 s32 tmax, tdelta, maxpow, powadj;
149
150 /* First, locate the PID params in SMU SBD */
151 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
152 if (hdr == 0) {
153 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
154 "max fan speed\n");
155 goto fail;
156 }
157 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
158
159 /* Get the FVT params for operating point 0 (the only supported one
160 * for now) in order to get tmax
161 */
162 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
163 if (hdr) {
164 fvt = (struct smu_sdbp_fvt *)&hdr[1];
165 tmax = ((s32)fvt->maxtemp) << 16;
166 } else
167 tmax = 0x5e0000; /* 94 degree default */
168
169 /* Alloc & initialize state */
170 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
171 GFP_KERNEL);
172 if (wf_smu_cpu_fans == NULL)
173 goto fail;
174 wf_smu_cpu_fans->ticks = 1;
175
176 /* Fill PID params */
177 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
178 pid_param.history_len = piddata->history_len;
179 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
180 printk(KERN_WARNING "windfarm: History size overflow on "
181 "CPU control loop (%d)\n", piddata->history_len);
182 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
183 }
184 pid_param.gd = piddata->gd;
185 pid_param.gp = piddata->gp;
186 pid_param.gr = piddata->gr / pid_param.history_len;
187
188 tdelta = ((s32)piddata->target_temp_delta) << 16;
189 maxpow = ((s32)piddata->max_power) << 16;
190 powadj = ((s32)piddata->power_adj) << 16;
191
192 pid_param.tmax = tmax;
193 pid_param.ttarget = tmax - tdelta;
194 pid_param.pmaxadj = maxpow - powadj;
195
196 pid_param.min = wf_control_get_min(fan_cpu_main);
197 pid_param.max = wf_control_get_max(fan_cpu_main);
198
199 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
200
201 DBG("wf: CPU Fan control initialized.\n");
202 DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
203 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
204 pid_param.min, pid_param.max);
205
206 return;
207
208 fail:
209 printk(KERN_WARNING "windfarm: CPU fan config not found\n"
210 "for this machine model, max fan speed\n");
211
212 if (cpufreq_clamp)
213 wf_control_set_max(cpufreq_clamp);
214 if (fan_cpu_main)
215 wf_control_set_max(fan_cpu_main);
216}
217
218static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
219{
220 s32 new_setpoint, temp, power;
221 int rc;
222
223 if (--st->ticks != 0) {
224 if (wf_smu_readjust)
225 goto readjust;
226 return;
227 }
228 st->ticks = WF_SMU_CPU_FANS_INTERVAL;
229
230 rc = wf_sensor_get(sensor_cpu_temp, &temp);
231 if (rc) {
232 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
233 rc);
234 wf_smu_failure_state |= FAILURE_SENSOR;
235 return;
236 }
237
238 rc = wf_sensor_get(sensor_cpu_power, &power);
239 if (rc) {
240 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
241 rc);
242 wf_smu_failure_state |= FAILURE_SENSOR;
243 return;
244 }
245
246 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
247 FIX32TOPRINT(temp), FIX32TOPRINT(power));
248
249#ifdef HACKED_OVERTEMP
250 if (temp > 0x4a0000)
251 wf_smu_failure_state |= FAILURE_OVERTEMP;
252#else
253 if (temp > st->pid.param.tmax)
254 wf_smu_failure_state |= FAILURE_OVERTEMP;
255#endif
256 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
257
258 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
259
260 if (st->cpu_setpoint == new_setpoint)
261 return;
262 st->cpu_setpoint = new_setpoint;
263 readjust:
264 if (fan_cpu_main && wf_smu_failure_state == 0) {
265 rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
266 if (rc) {
267 printk(KERN_WARNING "windfarm: CPU main fan"
268 " error %d\n", rc);
269 wf_smu_failure_state |= FAILURE_FAN;
270 }
271 }
272 if (fan_cpu_second && wf_smu_failure_state == 0) {
273 rc = wf_control_set(fan_cpu_second, st->cpu_setpoint);
274 if (rc) {
275 printk(KERN_WARNING "windfarm: CPU second fan"
276 " error %d\n", rc);
277 wf_smu_failure_state |= FAILURE_FAN;
278 }
279 }
280 if (fan_cpu_third && wf_smu_failure_state == 0) {
281 rc = wf_control_set(fan_cpu_third, st->cpu_setpoint);
282 if (rc) {
283 printk(KERN_WARNING "windfarm: CPU third fan"
284 " error %d\n", rc);
285 wf_smu_failure_state |= FAILURE_FAN;
286 }
287 }
288}
289
290static void wf_smu_create_drive_fans(void)
291{
292 struct wf_pid_param param = {
293 .interval = 5,
294 .history_len = 2,
295 .gd = 0x01e00000,
296 .gp = 0x00500000,
297 .gr = 0x00000000,
298 .itarget = 0x00200000,
299 };
300
301 /* Alloc & initialize state */
302 wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
303 GFP_KERNEL);
304 if (wf_smu_drive_fans == NULL) {
305 printk(KERN_WARNING "windfarm: Memory allocation error"
306 " max fan speed\n");
307 goto fail;
308 }
309 wf_smu_drive_fans->ticks = 1;
310
311 /* Fill PID params */
312 param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
313 param.min = wf_control_get_min(fan_hd);
314 param.max = wf_control_get_max(fan_hd);
315 wf_pid_init(&wf_smu_drive_fans->pid, ¶m);
316
317 DBG("wf: Drive Fan control initialized.\n");
318 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
319 FIX32TOPRINT(param.itarget), param.min, param.max);
320 return;
321
322 fail:
323 if (fan_hd)
324 wf_control_set_max(fan_hd);
325}
326
327static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
328{
329 s32 new_setpoint, temp;
330 int rc;
331
332 if (--st->ticks != 0) {
333 if (wf_smu_readjust)
334 goto readjust;
335 return;
336 }
337 st->ticks = st->pid.param.interval;
338
339 rc = wf_sensor_get(sensor_hd_temp, &temp);
340 if (rc) {
341 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
342 rc);
343 wf_smu_failure_state |= FAILURE_SENSOR;
344 return;
345 }
346
347 DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
348 FIX32TOPRINT(temp));
349
350 if (temp > (st->pid.param.itarget + 0x50000))
351 wf_smu_failure_state |= FAILURE_OVERTEMP;
352
353 new_setpoint = wf_pid_run(&st->pid, temp);
354
355 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
356
357 if (st->setpoint == new_setpoint)
358 return;
359 st->setpoint = new_setpoint;
360 readjust:
361 if (fan_hd && wf_smu_failure_state == 0) {
362 rc = wf_control_set(fan_hd, st->setpoint);
363 if (rc) {
364 printk(KERN_WARNING "windfarm: HD fan error %d\n",
365 rc);
366 wf_smu_failure_state |= FAILURE_FAN;
367 }
368 }
369}
370
371static void wf_smu_create_slots_fans(void)
372{
373 struct wf_pid_param param = {
374 .interval = 1,
375 .history_len = 8,
376 .gd = 0x00000000,
377 .gp = 0x00000000,
378 .gr = 0x00020000,
379 .itarget = 0x00000000
380 };
381
382 /* Alloc & initialize state */
383 wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
384 GFP_KERNEL);
385 if (wf_smu_slots_fans == NULL) {
386 printk(KERN_WARNING "windfarm: Memory allocation error"
387 " max fan speed\n");
388 goto fail;
389 }
390 wf_smu_slots_fans->ticks = 1;
391
392 /* Fill PID params */
393 param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
394 param.min = wf_control_get_min(fan_slots);
395 param.max = wf_control_get_max(fan_slots);
396 wf_pid_init(&wf_smu_slots_fans->pid, ¶m);
397
398 DBG("wf: Slots Fan control initialized.\n");
399 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
400 FIX32TOPRINT(param.itarget), param.min, param.max);
401 return;
402
403 fail:
404 if (fan_slots)
405 wf_control_set_max(fan_slots);
406}
407
408static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
409{
410 s32 new_setpoint, power;
411 int rc;
412
413 if (--st->ticks != 0) {
414 if (wf_smu_readjust)
415 goto readjust;
416 return;
417 }
418 st->ticks = st->pid.param.interval;
419
420 rc = wf_sensor_get(sensor_slots_power, &power);
421 if (rc) {
422 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
423 rc);
424 wf_smu_failure_state |= FAILURE_SENSOR;
425 return;
426 }
427
428 DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
429 FIX32TOPRINT(power));
430
431#if 0 /* Check what makes a good overtemp condition */
432 if (power > (st->pid.param.itarget + 0x50000))
433 wf_smu_failure_state |= FAILURE_OVERTEMP;
434#endif
435
436 new_setpoint = wf_pid_run(&st->pid, power);
437
438 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
439
440 if (st->setpoint == new_setpoint)
441 return;
442 st->setpoint = new_setpoint;
443 readjust:
444 if (fan_slots && wf_smu_failure_state == 0) {
445 rc = wf_control_set(fan_slots, st->setpoint);
446 if (rc) {
447 printk(KERN_WARNING "windfarm: Slots fan error %d\n",
448 rc);
449 wf_smu_failure_state |= FAILURE_FAN;
450 }
451 }
452}
453
454
455/*
456 * ****** Setup / Init / Misc ... ******
457 *
458 */
459
460static void wf_smu_tick(void)
461{
462 unsigned int last_failure = wf_smu_failure_state;
463 unsigned int new_failure;
464
465 if (!wf_smu_started) {
466 DBG("wf: creating control loops !\n");
467 wf_smu_create_drive_fans();
468 wf_smu_create_slots_fans();
469 wf_smu_create_cpu_fans();
470 wf_smu_started = true;
471 }
472
473 /* Skipping ticks */
474 if (wf_smu_skipping && --wf_smu_skipping)
475 return;
476
477 wf_smu_failure_state = 0;
478 if (wf_smu_drive_fans)
479 wf_smu_drive_fans_tick(wf_smu_drive_fans);
480 if (wf_smu_slots_fans)
481 wf_smu_slots_fans_tick(wf_smu_slots_fans);
482 if (wf_smu_cpu_fans)
483 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
484
485 wf_smu_readjust = 0;
486 new_failure = wf_smu_failure_state & ~last_failure;
487
488 /* If entering failure mode, clamp cpufreq and ramp all
489 * fans to full speed.
490 */
491 if (wf_smu_failure_state && !last_failure) {
492 if (cpufreq_clamp)
493 wf_control_set_max(cpufreq_clamp);
494 if (fan_cpu_main)
495 wf_control_set_max(fan_cpu_main);
496 if (fan_cpu_second)
497 wf_control_set_max(fan_cpu_second);
498 if (fan_cpu_third)
499 wf_control_set_max(fan_cpu_third);
500 if (fan_hd)
501 wf_control_set_max(fan_hd);
502 if (fan_slots)
503 wf_control_set_max(fan_slots);
504 }
505
506 /* If leaving failure mode, unclamp cpufreq and readjust
507 * all fans on next iteration
508 */
509 if (!wf_smu_failure_state && last_failure) {
510 if (cpufreq_clamp)
511 wf_control_set_min(cpufreq_clamp);
512 wf_smu_readjust = 1;
513 }
514
515 /* Overtemp condition detected, notify and start skipping a couple
516 * ticks to let the temperature go down
517 */
518 if (new_failure & FAILURE_OVERTEMP) {
519 wf_set_overtemp();
520 wf_smu_skipping = 2;
521 wf_smu_overtemp = true;
522 }
523
524 /* We only clear the overtemp condition if overtemp is cleared
525 * _and_ no other failure is present. Since a sensor error will
526 * clear the overtemp condition (can't measure temperature) at
527 * the control loop levels, but we don't want to keep it clear
528 * here in this case
529 */
530 if (!wf_smu_failure_state && wf_smu_overtemp) {
531 wf_clear_overtemp();
532 wf_smu_overtemp = false;
533 }
534}
535
536
537static void wf_smu_new_control(struct wf_control *ct)
538{
539 if (wf_smu_all_controls_ok)
540 return;
541
542 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
543 if (wf_get_control(ct) == 0)
544 fan_cpu_main = ct;
545 }
546
547 if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
548 if (wf_get_control(ct) == 0)
549 fan_cpu_second = ct;
550 }
551
552 if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
553 if (wf_get_control(ct) == 0)
554 fan_cpu_third = ct;
555 }
556
557 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
558 if (wf_get_control(ct) == 0)
559 cpufreq_clamp = ct;
560 }
561
562 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
563 if (wf_get_control(ct) == 0)
564 fan_hd = ct;
565 }
566
567 if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
568 if (wf_get_control(ct) == 0)
569 fan_slots = ct;
570 }
571
572 if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
573 fan_slots && cpufreq_clamp)
574 wf_smu_all_controls_ok = 1;
575}
576
577static void wf_smu_new_sensor(struct wf_sensor *sr)
578{
579 if (wf_smu_all_sensors_ok)
580 return;
581
582 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
583 if (wf_get_sensor(sr) == 0)
584 sensor_cpu_power = sr;
585 }
586
587 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
588 if (wf_get_sensor(sr) == 0)
589 sensor_cpu_temp = sr;
590 }
591
592 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
593 if (wf_get_sensor(sr) == 0)
594 sensor_hd_temp = sr;
595 }
596
597 if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
598 if (wf_get_sensor(sr) == 0)
599 sensor_slots_power = sr;
600 }
601
602 if (sensor_cpu_power && sensor_cpu_temp &&
603 sensor_hd_temp && sensor_slots_power)
604 wf_smu_all_sensors_ok = 1;
605}
606
607
608static int wf_smu_notify(struct notifier_block *self,
609 unsigned long event, void *data)
610{
611 switch(event) {
612 case WF_EVENT_NEW_CONTROL:
613 DBG("wf: new control %s detected\n",
614 ((struct wf_control *)data)->name);
615 wf_smu_new_control(data);
616 wf_smu_readjust = 1;
617 break;
618 case WF_EVENT_NEW_SENSOR:
619 DBG("wf: new sensor %s detected\n",
620 ((struct wf_sensor *)data)->name);
621 wf_smu_new_sensor(data);
622 break;
623 case WF_EVENT_TICK:
624 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
625 wf_smu_tick();
626 }
627
628 return 0;
629}
630
631static struct notifier_block wf_smu_events = {
632 .notifier_call = wf_smu_notify,
633};
634
635static int wf_init_pm(void)
636{
637 printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
638
639 return 0;
640}
641
642static int wf_smu_probe(struct platform_device *ddev)
643{
644 wf_register_client(&wf_smu_events);
645
646 return 0;
647}
648
649static int wf_smu_remove(struct platform_device *ddev)
650{
651 wf_unregister_client(&wf_smu_events);
652
653 /* XXX We don't have yet a guarantee that our callback isn't
654 * in progress when returning from wf_unregister_client, so
655 * we add an arbitrary delay. I'll have to fix that in the core
656 */
657 msleep(1000);
658
659 /* Release all sensors */
660 /* One more crappy race: I don't think we have any guarantee here
661 * that the attribute callback won't race with the sensor beeing
662 * disposed of, and I'm not 100% certain what best way to deal
663 * with that except by adding locks all over... I'll do that
664 * eventually but heh, who ever rmmod this module anyway ?
665 */
666 if (sensor_cpu_power)
667 wf_put_sensor(sensor_cpu_power);
668 if (sensor_cpu_temp)
669 wf_put_sensor(sensor_cpu_temp);
670 if (sensor_hd_temp)
671 wf_put_sensor(sensor_hd_temp);
672 if (sensor_slots_power)
673 wf_put_sensor(sensor_slots_power);
674
675 /* Release all controls */
676 if (fan_cpu_main)
677 wf_put_control(fan_cpu_main);
678 if (fan_cpu_second)
679 wf_put_control(fan_cpu_second);
680 if (fan_cpu_third)
681 wf_put_control(fan_cpu_third);
682 if (fan_hd)
683 wf_put_control(fan_hd);
684 if (fan_slots)
685 wf_put_control(fan_slots);
686 if (cpufreq_clamp)
687 wf_put_control(cpufreq_clamp);
688
689 /* Destroy control loops state structures */
690 kfree(wf_smu_slots_fans);
691 kfree(wf_smu_drive_fans);
692 kfree(wf_smu_cpu_fans);
693
694 return 0;
695}
696
697static struct platform_driver wf_smu_driver = {
698 .probe = wf_smu_probe,
699 .remove = wf_smu_remove,
700 .driver = {
701 .name = "windfarm",
702 },
703};
704
705
706static int __init wf_smu_init(void)
707{
708 int rc = -ENODEV;
709
710 if (of_machine_is_compatible("PowerMac9,1"))
711 rc = wf_init_pm();
712
713 if (rc == 0) {
714#ifdef MODULE
715 request_module("windfarm_smu_controls");
716 request_module("windfarm_smu_sensors");
717 request_module("windfarm_lm75_sensor");
718 request_module("windfarm_cpufreq_clamp");
719
720#endif /* MODULE */
721 platform_driver_register(&wf_smu_driver);
722 }
723
724 return rc;
725}
726
727static void __exit wf_smu_exit(void)
728{
729
730 platform_driver_unregister(&wf_smu_driver);
731}
732
733
734module_init(wf_smu_init);
735module_exit(wf_smu_exit);
736
737MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
738MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
739MODULE_LICENSE("GPL");
740
741MODULE_ALIAS("platform:windfarm");