blob: 344273235124e94aef27fec53d68f7b963b0059d [file] [log] [blame]
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +11001/*
2 * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops
3 *
4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
5 * <benh@kernel.crashing.org>
6 *
7 * Released under the term of the GNU GPL v2.
8 *
9 * The algorithm used is the PID control algorithm, used the same
10 * way the published Darwin code does, using the same values that
11 * are present in the Darwin 8.2 snapshot property lists (note however
12 * that none of the code has been re-used, it's a complete re-implementation
13 *
14 * The various control loops found in Darwin config file are:
15 *
16 * PowerMac9,1
17 * ===========
18 *
19 * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't
20 * try to play with other control loops fans). Drive bay is rather basic PID
21 * with one sensor and one fan. Slots area is a bit different as the Darwin
22 * driver is supposed to be capable of working in a special "AGP" mode which
23 * involves the presence of an AGP sensor and an AGP fan (possibly on the
24 * AGP card itself). I can't deal with that special mode as I don't have
25 * access to those additional sensor/fans for now (though ultimately, it would
26 * be possible to add sensor objects for them) so I'm only implementing the
27 * basic PCI slot control loop
28 */
29
30#include <linux/types.h>
31#include <linux/errno.h>
32#include <linux/kernel.h>
33#include <linux/delay.h>
34#include <linux/slab.h>
35#include <linux/init.h>
36#include <linux/spinlock.h>
37#include <linux/wait.h>
38#include <linux/kmod.h>
39#include <linux/device.h>
40#include <linux/platform_device.h>
41#include <asm/prom.h>
42#include <asm/machdep.h>
43#include <asm/io.h>
44#include <asm/system.h>
45#include <asm/sections.h>
46#include <asm/smu.h>
47
48#include "windfarm.h"
49#include "windfarm_pid.h"
50
51#define VERSION "0.4"
52
53#undef DEBUG
54
55#ifdef DEBUG
56#define DBG(args...) printk(args)
57#else
58#define DBG(args...) do { } while(0)
59#endif
60
61/* define this to force CPU overtemp to 74 degree, useful for testing
62 * the overtemp code
63 */
64#undef HACKED_OVERTEMP
65
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +110066/* Controls & sensors */
67static struct wf_sensor *sensor_cpu_power;
68static struct wf_sensor *sensor_cpu_temp;
69static struct wf_sensor *sensor_hd_temp;
70static struct wf_sensor *sensor_slots_power;
71static struct wf_control *fan_cpu_main;
72static struct wf_control *fan_cpu_second;
73static struct wf_control *fan_cpu_third;
74static struct wf_control *fan_hd;
75static struct wf_control *fan_slots;
76static struct wf_control *cpufreq_clamp;
77
78/* Set to kick the control loop into life */
79static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
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;
Jeremy Kerr018a3d12006-07-12 15:40:29 +1000145 const struct smu_sdbp_header *hdr;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100146 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 = fan_cpu_main->ops->get_min(fan_cpu_main);
197 pid_param.max = fan_cpu_main->ops->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(" ttarged=%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 = sensor_cpu_temp->ops->get_value(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 = sensor_cpu_power->ops->get_value(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 = fan_cpu_main->ops->set_value(fan_cpu_main,
266 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 = fan_cpu_second->ops->set_value(fan_cpu_second,
275 st->cpu_setpoint);
276 if (rc) {
277 printk(KERN_WARNING "windfarm: CPU second fan"
278 " error %d\n", rc);
279 wf_smu_failure_state |= FAILURE_FAN;
280 }
281 }
282 if (fan_cpu_third && wf_smu_failure_state == 0) {
283 rc = fan_cpu_main->ops->set_value(fan_cpu_third,
284 st->cpu_setpoint);
285 if (rc) {
286 printk(KERN_WARNING "windfarm: CPU third fan"
287 " error %d\n", rc);
288 wf_smu_failure_state |= FAILURE_FAN;
289 }
290 }
291}
292
293static void wf_smu_create_drive_fans(void)
294{
295 struct wf_pid_param param = {
296 .interval = 5,
297 .history_len = 2,
298 .gd = 0x01e00000,
299 .gp = 0x00500000,
300 .gr = 0x00000000,
301 .itarget = 0x00200000,
302 };
303
304 /* Alloc & initialize state */
305 wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
306 GFP_KERNEL);
307 if (wf_smu_drive_fans == NULL) {
308 printk(KERN_WARNING "windfarm: Memory allocation error"
309 " max fan speed\n");
310 goto fail;
311 }
312 wf_smu_drive_fans->ticks = 1;
313
314 /* Fill PID params */
315 param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
316 param.min = fan_hd->ops->get_min(fan_hd);
317 param.max = fan_hd->ops->get_max(fan_hd);
318 wf_pid_init(&wf_smu_drive_fans->pid, &param);
319
320 DBG("wf: Drive Fan control initialized.\n");
321 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
322 FIX32TOPRINT(param.itarget), param.min, param.max);
323 return;
324
325 fail:
326 if (fan_hd)
327 wf_control_set_max(fan_hd);
328}
329
330static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
331{
332 s32 new_setpoint, temp;
333 int rc;
334
335 if (--st->ticks != 0) {
336 if (wf_smu_readjust)
337 goto readjust;
338 return;
339 }
340 st->ticks = st->pid.param.interval;
341
342 rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
343 if (rc) {
344 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
345 rc);
346 wf_smu_failure_state |= FAILURE_SENSOR;
347 return;
348 }
349
350 DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
351 FIX32TOPRINT(temp));
352
353 if (temp > (st->pid.param.itarget + 0x50000))
354 wf_smu_failure_state |= FAILURE_OVERTEMP;
355
356 new_setpoint = wf_pid_run(&st->pid, temp);
357
358 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
359
360 if (st->setpoint == new_setpoint)
361 return;
362 st->setpoint = new_setpoint;
363 readjust:
364 if (fan_hd && wf_smu_failure_state == 0) {
365 rc = fan_hd->ops->set_value(fan_hd, st->setpoint);
366 if (rc) {
367 printk(KERN_WARNING "windfarm: HD fan error %d\n",
368 rc);
369 wf_smu_failure_state |= FAILURE_FAN;
370 }
371 }
372}
373
374static void wf_smu_create_slots_fans(void)
375{
376 struct wf_pid_param param = {
377 .interval = 1,
378 .history_len = 8,
379 .gd = 0x00000000,
380 .gp = 0x00000000,
381 .gr = 0x00020000,
382 .itarget = 0x00000000
383 };
384
385 /* Alloc & initialize state */
386 wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
387 GFP_KERNEL);
388 if (wf_smu_slots_fans == NULL) {
389 printk(KERN_WARNING "windfarm: Memory allocation error"
390 " max fan speed\n");
391 goto fail;
392 }
393 wf_smu_slots_fans->ticks = 1;
394
395 /* Fill PID params */
396 param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
397 param.min = fan_slots->ops->get_min(fan_slots);
398 param.max = fan_slots->ops->get_max(fan_slots);
399 wf_pid_init(&wf_smu_slots_fans->pid, &param);
400
401 DBG("wf: Slots Fan control initialized.\n");
402 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
403 FIX32TOPRINT(param.itarget), param.min, param.max);
404 return;
405
406 fail:
407 if (fan_slots)
408 wf_control_set_max(fan_slots);
409}
410
411static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
412{
413 s32 new_setpoint, power;
414 int rc;
415
416 if (--st->ticks != 0) {
417 if (wf_smu_readjust)
418 goto readjust;
419 return;
420 }
421 st->ticks = st->pid.param.interval;
422
423 rc = sensor_slots_power->ops->get_value(sensor_slots_power, &power);
424 if (rc) {
425 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
426 rc);
427 wf_smu_failure_state |= FAILURE_SENSOR;
428 return;
429 }
430
431 DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
432 FIX32TOPRINT(power));
433
434#if 0 /* Check what makes a good overtemp condition */
435 if (power > (st->pid.param.itarget + 0x50000))
436 wf_smu_failure_state |= FAILURE_OVERTEMP;
437#endif
438
439 new_setpoint = wf_pid_run(&st->pid, power);
440
441 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
442
443 if (st->setpoint == new_setpoint)
444 return;
445 st->setpoint = new_setpoint;
446 readjust:
447 if (fan_slots && wf_smu_failure_state == 0) {
448 rc = fan_slots->ops->set_value(fan_slots, st->setpoint);
449 if (rc) {
450 printk(KERN_WARNING "windfarm: Slots fan error %d\n",
451 rc);
452 wf_smu_failure_state |= FAILURE_FAN;
453 }
454 }
455}
456
457
458/*
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100459 * ****** Setup / Init / Misc ... ******
460 *
461 */
462
463static void wf_smu_tick(void)
464{
465 unsigned int last_failure = wf_smu_failure_state;
466 unsigned int new_failure;
467
468 if (!wf_smu_started) {
469 DBG("wf: creating control loops !\n");
470 wf_smu_create_drive_fans();
471 wf_smu_create_slots_fans();
472 wf_smu_create_cpu_fans();
473 wf_smu_started = 1;
474 }
475
476 /* Skipping ticks */
477 if (wf_smu_skipping && --wf_smu_skipping)
478 return;
479
480 wf_smu_failure_state = 0;
481 if (wf_smu_drive_fans)
482 wf_smu_drive_fans_tick(wf_smu_drive_fans);
483 if (wf_smu_slots_fans)
484 wf_smu_slots_fans_tick(wf_smu_slots_fans);
485 if (wf_smu_cpu_fans)
486 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
487
488 wf_smu_readjust = 0;
489 new_failure = wf_smu_failure_state & ~last_failure;
490
491 /* If entering failure mode, clamp cpufreq and ramp all
492 * fans to full speed.
493 */
494 if (wf_smu_failure_state && !last_failure) {
495 if (cpufreq_clamp)
496 wf_control_set_max(cpufreq_clamp);
497 if (fan_cpu_main)
498 wf_control_set_max(fan_cpu_main);
499 if (fan_cpu_second)
500 wf_control_set_max(fan_cpu_second);
501 if (fan_cpu_third)
502 wf_control_set_max(fan_cpu_third);
503 if (fan_hd)
504 wf_control_set_max(fan_hd);
505 if (fan_slots)
506 wf_control_set_max(fan_slots);
507 }
508
509 /* If leaving failure mode, unclamp cpufreq and readjust
510 * all fans on next iteration
511 */
512 if (!wf_smu_failure_state && last_failure) {
513 if (cpufreq_clamp)
514 wf_control_set_min(cpufreq_clamp);
515 wf_smu_readjust = 1;
516 }
517
518 /* Overtemp condition detected, notify and start skipping a couple
519 * ticks to let the temperature go down
520 */
521 if (new_failure & FAILURE_OVERTEMP) {
522 wf_set_overtemp();
523 wf_smu_skipping = 2;
524 }
525
526 /* We only clear the overtemp condition if overtemp is cleared
527 * _and_ no other failure is present. Since a sensor error will
528 * clear the overtemp condition (can't measure temperature) at
529 * the control loop levels, but we don't want to keep it clear
530 * here in this case
531 */
532 if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
533 wf_clear_overtemp();
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")) {
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100543 if (wf_get_control(ct) == 0)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100544 fan_cpu_main = ct;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100545 }
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")) {
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100563 if (wf_get_control(ct) == 0)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100564 fan_hd = ct;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100565 }
566
567 if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100568 if (wf_get_control(ct) == 0)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100569 fan_slots = ct;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100570 }
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")) {
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100583 if (wf_get_sensor(sr) == 0)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100584 sensor_cpu_power = sr;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100585 }
586
587 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100588 if (wf_get_sensor(sr) == 0)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100589 sensor_cpu_temp = sr;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100590 }
591
592 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100593 if (wf_get_sensor(sr) == 0)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100594 sensor_hd_temp = sr;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100595 }
596
597 if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100598 if (wf_get_sensor(sr) == 0)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100599 sensor_slots_power = sr;
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100600 }
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
Benjamin Herrenschmidt10270612006-10-10 11:47:31 +1000642static int wf_smu_probe(struct platform_device *ddev)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100643{
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100644 wf_register_client(&wf_smu_events);
645
646 return 0;
647}
648
Benjamin Herrenschmidt10270612006-10-10 11:47:31 +1000649static int __devexit wf_smu_remove(struct platform_device *ddev)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100650{
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 */
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100666 if (sensor_cpu_power)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100667 wf_put_sensor(sensor_cpu_power);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100668 if (sensor_cpu_temp)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100669 wf_put_sensor(sensor_cpu_temp);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100670 if (sensor_hd_temp)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100671 wf_put_sensor(sensor_hd_temp);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100672 if (sensor_slots_power)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100673 wf_put_sensor(sensor_slots_power);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100674
675 /* Release all controls */
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100676 if (fan_cpu_main)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100677 wf_put_control(fan_cpu_main);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100678 if (fan_cpu_second)
679 wf_put_control(fan_cpu_second);
680 if (fan_cpu_third)
681 wf_put_control(fan_cpu_third);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100682 if (fan_hd)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100683 wf_put_control(fan_hd);
Benjamin Herrenschmidtac171c42006-02-08 16:42:51 +1100684 if (fan_slots)
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100685 wf_put_control(fan_slots);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100686 if (cpufreq_clamp)
687 wf_put_control(cpufreq_clamp);
688
689 /* Destroy control loops state structures */
Julia Lawallab30f782010-03-28 23:39:22 +0000690 kfree(wf_smu_slots_fans);
691 kfree(wf_smu_drive_fans);
692 kfree(wf_smu_cpu_fans);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100693
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100694 return 0;
695}
696
Benjamin Herrenschmidt10270612006-10-10 11:47:31 +1000697static struct platform_driver wf_smu_driver = {
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100698 .probe = wf_smu_probe,
Benjamin Herrenschmidt10270612006-10-10 11:47:31 +1000699 .remove = __devexit_p(wf_smu_remove),
700 .driver = {
701 .name = "windfarm",
Kay Sievers23386fe2008-04-18 13:33:53 -0700702 .owner = THIS_MODULE,
Benjamin Herrenschmidt10270612006-10-10 11:47:31 +1000703 },
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100704};
705
706
707static int __init wf_smu_init(void)
708{
709 int rc = -ENODEV;
710
Grant Likely71a157e2010-02-01 21:34:14 -0700711 if (of_machine_is_compatible("PowerMac9,1"))
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100712 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");
Benjamin Herrenschmidtd31e8172006-11-16 14:00:57 +1100719 request_module("windfarm_cpufreq_clamp");
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100720
721#endif /* MODULE */
Benjamin Herrenschmidt10270612006-10-10 11:47:31 +1000722 platform_driver_register(&wf_smu_driver);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100723 }
724
725 return rc;
726}
727
728static void __exit wf_smu_exit(void)
729{
730
Benjamin Herrenschmidt10270612006-10-10 11:47:31 +1000731 platform_driver_unregister(&wf_smu_driver);
Benjamin Herrenschmidt75722d32005-11-07 16:08:17 +1100732}
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
Kay Sievers23386fe2008-04-18 13:33:53 -0700742MODULE_ALIAS("platform:windfarm");