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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Windfarm PowerMac thermal control.
4 * Control loops for machines with SMU and PPC970MP processors.
5 *
6 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
7 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
8 */
9#include <linux/types.h>
10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/device.h>
13#include <linux/platform_device.h>
14#include <linux/reboot.h>
15#include <asm/prom.h>
16#include <asm/smu.h>
17
18#include "windfarm.h"
19#include "windfarm_pid.h"
20
21#define VERSION "0.2"
22
23#define DEBUG
24#undef LOTSA_DEBUG
25
26#ifdef DEBUG
27#define DBG(args...) printk(args)
28#else
29#define DBG(args...) do { } while(0)
30#endif
31
32#ifdef LOTSA_DEBUG
33#define DBG_LOTS(args...) printk(args)
34#else
35#define DBG_LOTS(args...) do { } while(0)
36#endif
37
38/* define this to force CPU overtemp to 60 degree, useful for testing
39 * the overtemp code
40 */
41#undef HACKED_OVERTEMP
42
43/* We currently only handle 2 chips, 4 cores... */
44#define NR_CHIPS 2
45#define NR_CORES 4
46#define NR_CPU_FANS 3 * NR_CHIPS
47
48/* Controls and sensors */
49static struct wf_sensor *sens_cpu_temp[NR_CORES];
50static struct wf_sensor *sens_cpu_power[NR_CORES];
51static struct wf_sensor *hd_temp;
52static struct wf_sensor *slots_power;
53static struct wf_sensor *u4_temp;
54
55static struct wf_control *cpu_fans[NR_CPU_FANS];
56static char *cpu_fan_names[NR_CPU_FANS] = {
57 "cpu-rear-fan-0",
58 "cpu-rear-fan-1",
59 "cpu-front-fan-0",
60 "cpu-front-fan-1",
61 "cpu-pump-0",
62 "cpu-pump-1",
63};
64static struct wf_control *cpufreq_clamp;
65
66/* Second pump isn't required (and isn't actually present) */
67#define CPU_FANS_REQD (NR_CPU_FANS - 2)
68#define FIRST_PUMP 4
69#define LAST_PUMP 5
70
71/* We keep a temperature history for average calculation of 180s */
72#define CPU_TEMP_HIST_SIZE 180
73
74/* Scale factor for fan speed, *100 */
75static int cpu_fan_scale[NR_CPU_FANS] = {
76 100,
77 100,
78 97, /* inlet fans run at 97% of exhaust fan */
79 97,
80 100, /* updated later */
81 100, /* updated later */
82};
83
84static struct wf_control *backside_fan;
85static struct wf_control *slots_fan;
86static struct wf_control *drive_bay_fan;
87
88/* PID loop state */
89static struct wf_cpu_pid_state cpu_pid[NR_CORES];
90static u32 cpu_thist[CPU_TEMP_HIST_SIZE];
91static int cpu_thist_pt;
92static s64 cpu_thist_total;
93static s32 cpu_all_tmax = 100 << 16;
94static int cpu_last_target;
95static struct wf_pid_state backside_pid;
96static int backside_tick;
97static struct wf_pid_state slots_pid;
98static bool slots_started;
99static struct wf_pid_state drive_bay_pid;
100static int drive_bay_tick;
101
102static int nr_cores;
103static int have_all_controls;
104static int have_all_sensors;
105static bool started;
106
107static int failure_state;
108#define FAILURE_SENSOR 1
109#define FAILURE_FAN 2
110#define FAILURE_PERM 4
111#define FAILURE_LOW_OVERTEMP 8
112#define FAILURE_HIGH_OVERTEMP 16
113
114/* Overtemp values */
115#define LOW_OVER_AVERAGE 0
116#define LOW_OVER_IMMEDIATE (10 << 16)
117#define LOW_OVER_CLEAR ((-10) << 16)
118#define HIGH_OVER_IMMEDIATE (14 << 16)
119#define HIGH_OVER_AVERAGE (10 << 16)
120#define HIGH_OVER_IMMEDIATE (14 << 16)
121
122
123/* Implementation... */
124static int create_cpu_loop(int cpu)
125{
126 int chip = cpu / 2;
127 int core = cpu & 1;
128 struct smu_sdbp_header *hdr;
129 struct smu_sdbp_cpupiddata *piddata;
130 struct wf_cpu_pid_param pid;
131 struct wf_control *main_fan = cpu_fans[0];
132 s32 tmax;
133 int fmin;
134
135 /* Get PID params from the appropriate SAT */
136 hdr = smu_sat_get_sdb_partition(chip, 0xC8 + core, NULL);
137 if (hdr == NULL) {
138 printk(KERN_WARNING"windfarm: can't get CPU PID fan config\n");
139 return -EINVAL;
140 }
141 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
142
143 /* Get FVT params to get Tmax; if not found, assume default */
144 hdr = smu_sat_get_sdb_partition(chip, 0xC4 + core, NULL);
145 if (hdr) {
146 struct smu_sdbp_fvt *fvt = (struct smu_sdbp_fvt *)&hdr[1];
147 tmax = fvt->maxtemp << 16;
148 } else
149 tmax = 95 << 16; /* default to 95 degrees C */
150
151 /* We keep a global tmax for overtemp calculations */
152 if (tmax < cpu_all_tmax)
153 cpu_all_tmax = tmax;
154
155 /*
156 * Darwin has a minimum fan speed of 1000 rpm for the 4-way and
157 * 515 for the 2-way. That appears to be overkill, so for now,
158 * impose a minimum of 750 or 515.
159 */
160 fmin = (nr_cores > 2) ? 750 : 515;
161
162 /* Initialize PID loop */
163 pid.interval = 1; /* seconds */
164 pid.history_len = piddata->history_len;
165 pid.gd = piddata->gd;
166 pid.gp = piddata->gp;
167 pid.gr = piddata->gr / piddata->history_len;
168 pid.pmaxadj = (piddata->max_power << 16) - (piddata->power_adj << 8);
169 pid.ttarget = tmax - (piddata->target_temp_delta << 16);
170 pid.tmax = tmax;
171 pid.min = main_fan->ops->get_min(main_fan);
172 pid.max = main_fan->ops->get_max(main_fan);
173 if (pid.min < fmin)
174 pid.min = fmin;
175
176 wf_cpu_pid_init(&cpu_pid[cpu], &pid);
177 return 0;
178}
179
180static void cpu_max_all_fans(void)
181{
182 int i;
183
184 /* We max all CPU fans in case of a sensor error. We also do the
185 * cpufreq clamping now, even if it's supposedly done later by the
186 * generic code anyway, we do it earlier here to react faster
187 */
188 if (cpufreq_clamp)
189 wf_control_set_max(cpufreq_clamp);
190 for (i = 0; i < NR_CPU_FANS; ++i)
191 if (cpu_fans[i])
192 wf_control_set_max(cpu_fans[i]);
193}
194
195static int cpu_check_overtemp(s32 temp)
196{
197 int new_state = 0;
198 s32 t_avg, t_old;
199
200 /* First check for immediate overtemps */
201 if (temp >= (cpu_all_tmax + LOW_OVER_IMMEDIATE)) {
202 new_state |= FAILURE_LOW_OVERTEMP;
203 if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
204 printk(KERN_ERR "windfarm: Overtemp due to immediate CPU"
205 " temperature !\n");
206 }
207 if (temp >= (cpu_all_tmax + HIGH_OVER_IMMEDIATE)) {
208 new_state |= FAILURE_HIGH_OVERTEMP;
209 if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
210 printk(KERN_ERR "windfarm: Critical overtemp due to"
211 " immediate CPU temperature !\n");
212 }
213
214 /* We calculate a history of max temperatures and use that for the
215 * overtemp management
216 */
217 t_old = cpu_thist[cpu_thist_pt];
218 cpu_thist[cpu_thist_pt] = temp;
219 cpu_thist_pt = (cpu_thist_pt + 1) % CPU_TEMP_HIST_SIZE;
220 cpu_thist_total -= t_old;
221 cpu_thist_total += temp;
222 t_avg = cpu_thist_total / CPU_TEMP_HIST_SIZE;
223
224 DBG_LOTS("t_avg = %d.%03d (out: %d.%03d, in: %d.%03d)\n",
225 FIX32TOPRINT(t_avg), FIX32TOPRINT(t_old), FIX32TOPRINT(temp));
226
227 /* Now check for average overtemps */
228 if (t_avg >= (cpu_all_tmax + LOW_OVER_AVERAGE)) {
229 new_state |= FAILURE_LOW_OVERTEMP;
230 if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
231 printk(KERN_ERR "windfarm: Overtemp due to average CPU"
232 " temperature !\n");
233 }
234 if (t_avg >= (cpu_all_tmax + HIGH_OVER_AVERAGE)) {
235 new_state |= FAILURE_HIGH_OVERTEMP;
236 if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
237 printk(KERN_ERR "windfarm: Critical overtemp due to"
238 " average CPU temperature !\n");
239 }
240
241 /* Now handle overtemp conditions. We don't currently use the windfarm
242 * overtemp handling core as it's not fully suited to the needs of those
243 * new machine. This will be fixed later.
244 */
245 if (new_state) {
246 /* High overtemp -> immediate shutdown */
247 if (new_state & FAILURE_HIGH_OVERTEMP)
248 machine_power_off();
249 if ((failure_state & new_state) != new_state)
250 cpu_max_all_fans();
251 failure_state |= new_state;
252 } else if ((failure_state & FAILURE_LOW_OVERTEMP) &&
253 (temp < (cpu_all_tmax + LOW_OVER_CLEAR))) {
254 printk(KERN_ERR "windfarm: Overtemp condition cleared !\n");
255 failure_state &= ~FAILURE_LOW_OVERTEMP;
256 }
257
258 return failure_state & (FAILURE_LOW_OVERTEMP | FAILURE_HIGH_OVERTEMP);
259}
260
261static void cpu_fans_tick(void)
262{
263 int err, cpu;
264 s32 greatest_delta = 0;
265 s32 temp, power, t_max = 0;
266 int i, t, target = 0;
267 struct wf_sensor *sr;
268 struct wf_control *ct;
269 struct wf_cpu_pid_state *sp;
270
271 DBG_LOTS(KERN_DEBUG);
272 for (cpu = 0; cpu < nr_cores; ++cpu) {
273 /* Get CPU core temperature */
274 sr = sens_cpu_temp[cpu];
275 err = sr->ops->get_value(sr, &temp);
276 if (err) {
277 DBG("\n");
278 printk(KERN_WARNING "windfarm: CPU %d temperature "
279 "sensor error %d\n", cpu, err);
280 failure_state |= FAILURE_SENSOR;
281 cpu_max_all_fans();
282 return;
283 }
284
285 /* Keep track of highest temp */
286 t_max = max(t_max, temp);
287
288 /* Get CPU power */
289 sr = sens_cpu_power[cpu];
290 err = sr->ops->get_value(sr, &power);
291 if (err) {
292 DBG("\n");
293 printk(KERN_WARNING "windfarm: CPU %d power "
294 "sensor error %d\n", cpu, err);
295 failure_state |= FAILURE_SENSOR;
296 cpu_max_all_fans();
297 return;
298 }
299
300 /* Run PID */
301 sp = &cpu_pid[cpu];
302 t = wf_cpu_pid_run(sp, power, temp);
303
304 if (cpu == 0 || sp->last_delta > greatest_delta) {
305 greatest_delta = sp->last_delta;
306 target = t;
307 }
308 DBG_LOTS("[%d] P=%d.%.3d T=%d.%.3d ",
309 cpu, FIX32TOPRINT(power), FIX32TOPRINT(temp));
310 }
311 DBG_LOTS("fans = %d, t_max = %d.%03d\n", target, FIX32TOPRINT(t_max));
312
313 /* Darwin limits decrease to 20 per iteration */
314 if (target < (cpu_last_target - 20))
315 target = cpu_last_target - 20;
316 cpu_last_target = target;
317 for (cpu = 0; cpu < nr_cores; ++cpu)
318 cpu_pid[cpu].target = target;
319
320 /* Handle possible overtemps */
321 if (cpu_check_overtemp(t_max))
322 return;
323
324 /* Set fans */
325 for (i = 0; i < NR_CPU_FANS; ++i) {
326 ct = cpu_fans[i];
327 if (ct == NULL)
328 continue;
329 err = ct->ops->set_value(ct, target * cpu_fan_scale[i] / 100);
330 if (err) {
331 printk(KERN_WARNING "windfarm: fan %s reports "
332 "error %d\n", ct->name, err);
333 failure_state |= FAILURE_FAN;
334 break;
335 }
336 }
337}
338
339/* Backside/U4 fan */
340static struct wf_pid_param backside_param = {
341 .interval = 5,
342 .history_len = 2,
343 .gd = 48 << 20,
344 .gp = 5 << 20,
345 .gr = 0,
346 .itarget = 64 << 16,
347 .additive = 1,
348};
349
350static void backside_fan_tick(void)
351{
352 s32 temp;
353 int speed;
354 int err;
355
356 if (!backside_fan || !u4_temp)
357 return;
358 if (!backside_tick) {
359 /* first time; initialize things */
360 printk(KERN_INFO "windfarm: Backside control loop started.\n");
361 backside_param.min = backside_fan->ops->get_min(backside_fan);
362 backside_param.max = backside_fan->ops->get_max(backside_fan);
363 wf_pid_init(&backside_pid, &backside_param);
364 backside_tick = 1;
365 }
366 if (--backside_tick > 0)
367 return;
368 backside_tick = backside_pid.param.interval;
369
370 err = u4_temp->ops->get_value(u4_temp, &temp);
371 if (err) {
372 printk(KERN_WARNING "windfarm: U4 temp sensor error %d\n",
373 err);
374 failure_state |= FAILURE_SENSOR;
375 wf_control_set_max(backside_fan);
376 return;
377 }
378 speed = wf_pid_run(&backside_pid, temp);
379 DBG_LOTS("backside PID temp=%d.%.3d speed=%d\n",
380 FIX32TOPRINT(temp), speed);
381
382 err = backside_fan->ops->set_value(backside_fan, speed);
383 if (err) {
384 printk(KERN_WARNING "windfarm: backside fan error %d\n", err);
385 failure_state |= FAILURE_FAN;
386 }
387}
388
389/* Drive bay fan */
390static struct wf_pid_param drive_bay_prm = {
391 .interval = 5,
392 .history_len = 2,
393 .gd = 30 << 20,
394 .gp = 5 << 20,
395 .gr = 0,
396 .itarget = 40 << 16,
397 .additive = 1,
398};
399
400static void drive_bay_fan_tick(void)
401{
402 s32 temp;
403 int speed;
404 int err;
405
406 if (!drive_bay_fan || !hd_temp)
407 return;
408 if (!drive_bay_tick) {
409 /* first time; initialize things */
410 printk(KERN_INFO "windfarm: Drive bay control loop started.\n");
411 drive_bay_prm.min = drive_bay_fan->ops->get_min(drive_bay_fan);
412 drive_bay_prm.max = drive_bay_fan->ops->get_max(drive_bay_fan);
413 wf_pid_init(&drive_bay_pid, &drive_bay_prm);
414 drive_bay_tick = 1;
415 }
416 if (--drive_bay_tick > 0)
417 return;
418 drive_bay_tick = drive_bay_pid.param.interval;
419
420 err = hd_temp->ops->get_value(hd_temp, &temp);
421 if (err) {
422 printk(KERN_WARNING "windfarm: drive bay temp sensor "
423 "error %d\n", err);
424 failure_state |= FAILURE_SENSOR;
425 wf_control_set_max(drive_bay_fan);
426 return;
427 }
428 speed = wf_pid_run(&drive_bay_pid, temp);
429 DBG_LOTS("drive_bay PID temp=%d.%.3d speed=%d\n",
430 FIX32TOPRINT(temp), speed);
431
432 err = drive_bay_fan->ops->set_value(drive_bay_fan, speed);
433 if (err) {
434 printk(KERN_WARNING "windfarm: drive bay fan error %d\n", err);
435 failure_state |= FAILURE_FAN;
436 }
437}
438
439/* PCI slots area fan */
440/* This makes the fan speed proportional to the power consumed */
441static struct wf_pid_param slots_param = {
442 .interval = 1,
443 .history_len = 2,
444 .gd = 0,
445 .gp = 0,
446 .gr = 0x1277952,
447 .itarget = 0,
448 .min = 1560,
449 .max = 3510,
450};
451
452static void slots_fan_tick(void)
453{
454 s32 power;
455 int speed;
456 int err;
457
458 if (!slots_fan || !slots_power)
459 return;
460 if (!slots_started) {
461 /* first time; initialize things */
462 printk(KERN_INFO "windfarm: Slots control loop started.\n");
463 wf_pid_init(&slots_pid, &slots_param);
464 slots_started = true;
465 }
466
467 err = slots_power->ops->get_value(slots_power, &power);
468 if (err) {
469 printk(KERN_WARNING "windfarm: slots power sensor error %d\n",
470 err);
471 failure_state |= FAILURE_SENSOR;
472 wf_control_set_max(slots_fan);
473 return;
474 }
475 speed = wf_pid_run(&slots_pid, power);
476 DBG_LOTS("slots PID power=%d.%.3d speed=%d\n",
477 FIX32TOPRINT(power), speed);
478
479 err = slots_fan->ops->set_value(slots_fan, speed);
480 if (err) {
481 printk(KERN_WARNING "windfarm: slots fan error %d\n", err);
482 failure_state |= FAILURE_FAN;
483 }
484}
485
486static void set_fail_state(void)
487{
488 int i;
489
490 if (cpufreq_clamp)
491 wf_control_set_max(cpufreq_clamp);
492 for (i = 0; i < NR_CPU_FANS; ++i)
493 if (cpu_fans[i])
494 wf_control_set_max(cpu_fans[i]);
495 if (backside_fan)
496 wf_control_set_max(backside_fan);
497 if (slots_fan)
498 wf_control_set_max(slots_fan);
499 if (drive_bay_fan)
500 wf_control_set_max(drive_bay_fan);
501}
502
503static void pm112_tick(void)
504{
505 int i, last_failure;
506
507 if (!started) {
508 started = true;
509 printk(KERN_INFO "windfarm: CPUs control loops started.\n");
510 for (i = 0; i < nr_cores; ++i) {
511 if (create_cpu_loop(i) < 0) {
512 failure_state = FAILURE_PERM;
513 set_fail_state();
514 break;
515 }
516 }
517 DBG_LOTS("cpu_all_tmax=%d.%03d\n", FIX32TOPRINT(cpu_all_tmax));
518
519#ifdef HACKED_OVERTEMP
520 cpu_all_tmax = 60 << 16;
521#endif
522 }
523
524 /* Permanent failure, bail out */
525 if (failure_state & FAILURE_PERM)
526 return;
527 /* Clear all failure bits except low overtemp which will be eventually
528 * cleared by the control loop itself
529 */
530 last_failure = failure_state;
531 failure_state &= FAILURE_LOW_OVERTEMP;
532 cpu_fans_tick();
533 backside_fan_tick();
534 slots_fan_tick();
535 drive_bay_fan_tick();
536
537 DBG_LOTS("last_failure: 0x%x, failure_state: %x\n",
538 last_failure, failure_state);
539
540 /* Check for failures. Any failure causes cpufreq clamping */
541 if (failure_state && last_failure == 0 && cpufreq_clamp)
542 wf_control_set_max(cpufreq_clamp);
543 if (failure_state == 0 && last_failure && cpufreq_clamp)
544 wf_control_set_min(cpufreq_clamp);
545
546 /* That's it for now, we might want to deal with other failures
547 * differently in the future though
548 */
549}
550
551static void pm112_new_control(struct wf_control *ct)
552{
553 int i, max_exhaust;
554
555 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
556 if (wf_get_control(ct) == 0)
557 cpufreq_clamp = ct;
558 }
559
560 for (i = 0; i < NR_CPU_FANS; ++i) {
561 if (!strcmp(ct->name, cpu_fan_names[i])) {
562 if (cpu_fans[i] == NULL && wf_get_control(ct) == 0)
563 cpu_fans[i] = ct;
564 break;
565 }
566 }
567 if (i >= NR_CPU_FANS) {
568 /* not a CPU fan, try the others */
569 if (!strcmp(ct->name, "backside-fan")) {
570 if (backside_fan == NULL && wf_get_control(ct) == 0)
571 backside_fan = ct;
572 } else if (!strcmp(ct->name, "slots-fan")) {
573 if (slots_fan == NULL && wf_get_control(ct) == 0)
574 slots_fan = ct;
575 } else if (!strcmp(ct->name, "drive-bay-fan")) {
576 if (drive_bay_fan == NULL && wf_get_control(ct) == 0)
577 drive_bay_fan = ct;
578 }
579 return;
580 }
581
582 for (i = 0; i < CPU_FANS_REQD; ++i)
583 if (cpu_fans[i] == NULL)
584 return;
585
586 /* work out pump scaling factors */
587 max_exhaust = cpu_fans[0]->ops->get_max(cpu_fans[0]);
588 for (i = FIRST_PUMP; i <= LAST_PUMP; ++i)
589 if ((ct = cpu_fans[i]) != NULL)
590 cpu_fan_scale[i] =
591 ct->ops->get_max(ct) * 100 / max_exhaust;
592
593 have_all_controls = 1;
594}
595
596static void pm112_new_sensor(struct wf_sensor *sr)
597{
598 unsigned int i;
599
600 if (!strncmp(sr->name, "cpu-temp-", 9)) {
601 i = sr->name[9] - '0';
602 if (sr->name[10] == 0 && i < NR_CORES &&
603 sens_cpu_temp[i] == NULL && wf_get_sensor(sr) == 0)
604 sens_cpu_temp[i] = sr;
605
606 } else if (!strncmp(sr->name, "cpu-power-", 10)) {
607 i = sr->name[10] - '0';
608 if (sr->name[11] == 0 && i < NR_CORES &&
609 sens_cpu_power[i] == NULL && wf_get_sensor(sr) == 0)
610 sens_cpu_power[i] = sr;
611 } else if (!strcmp(sr->name, "hd-temp")) {
612 if (hd_temp == NULL && wf_get_sensor(sr) == 0)
613 hd_temp = sr;
614 } else if (!strcmp(sr->name, "slots-power")) {
615 if (slots_power == NULL && wf_get_sensor(sr) == 0)
616 slots_power = sr;
617 } else if (!strcmp(sr->name, "backside-temp")) {
618 if (u4_temp == NULL && wf_get_sensor(sr) == 0)
619 u4_temp = sr;
620 } else
621 return;
622
623 /* check if we have all the sensors we need */
624 for (i = 0; i < nr_cores; ++i)
625 if (sens_cpu_temp[i] == NULL || sens_cpu_power[i] == NULL)
626 return;
627
628 have_all_sensors = 1;
629}
630
631static int pm112_wf_notify(struct notifier_block *self,
632 unsigned long event, void *data)
633{
634 switch (event) {
635 case WF_EVENT_NEW_SENSOR:
636 pm112_new_sensor(data);
637 break;
638 case WF_EVENT_NEW_CONTROL:
639 pm112_new_control(data);
640 break;
641 case WF_EVENT_TICK:
642 if (have_all_controls && have_all_sensors)
643 pm112_tick();
644 }
645 return 0;
646}
647
648static struct notifier_block pm112_events = {
649 .notifier_call = pm112_wf_notify,
650};
651
652static int wf_pm112_probe(struct platform_device *dev)
653{
654 wf_register_client(&pm112_events);
655 return 0;
656}
657
658static int wf_pm112_remove(struct platform_device *dev)
659{
660 wf_unregister_client(&pm112_events);
661 /* should release all sensors and controls */
662 return 0;
663}
664
665static struct platform_driver wf_pm112_driver = {
666 .probe = wf_pm112_probe,
667 .remove = wf_pm112_remove,
668 .driver = {
669 .name = "windfarm",
670 },
671};
672
673static int __init wf_pm112_init(void)
674{
675 struct device_node *cpu;
676
677 if (!of_machine_is_compatible("PowerMac11,2"))
678 return -ENODEV;
679
680 /* Count the number of CPU cores */
681 nr_cores = 0;
682 for_each_node_by_type(cpu, "cpu")
683 ++nr_cores;
684
685 printk(KERN_INFO "windfarm: initializing for dual-core desktop G5\n");
686
687#ifdef MODULE
688 request_module("windfarm_smu_controls");
689 request_module("windfarm_smu_sensors");
690 request_module("windfarm_smu_sat");
691 request_module("windfarm_lm75_sensor");
692 request_module("windfarm_max6690_sensor");
693 request_module("windfarm_cpufreq_clamp");
694
695#endif /* MODULE */
696
697 platform_driver_register(&wf_pm112_driver);
698 return 0;
699}
700
701static void __exit wf_pm112_exit(void)
702{
703 platform_driver_unregister(&wf_pm112_driver);
704}
705
706module_init(wf_pm112_init);
707module_exit(wf_pm112_exit);
708
709MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
710MODULE_DESCRIPTION("Thermal control for PowerMac11,2");
711MODULE_LICENSE("GPL");
712MODULE_ALIAS("platform:windfarm");
1/*
2 * Windfarm PowerMac thermal control.
3 * Control loops for machines with SMU and PPC970MP processors.
4 *
5 * Copyright (C) 2005 Paul Mackerras, IBM Corp. <paulus@samba.org>
6 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
7 *
8 * Use and redistribute under the terms of the GNU GPL v2.
9 */
10#include <linux/types.h>
11#include <linux/errno.h>
12#include <linux/kernel.h>
13#include <linux/device.h>
14#include <linux/platform_device.h>
15#include <linux/reboot.h>
16#include <asm/prom.h>
17#include <asm/smu.h>
18
19#include "windfarm.h"
20#include "windfarm_pid.h"
21
22#define VERSION "0.2"
23
24#define DEBUG
25#undef LOTSA_DEBUG
26
27#ifdef DEBUG
28#define DBG(args...) printk(args)
29#else
30#define DBG(args...) do { } while(0)
31#endif
32
33#ifdef LOTSA_DEBUG
34#define DBG_LOTS(args...) printk(args)
35#else
36#define DBG_LOTS(args...) do { } while(0)
37#endif
38
39/* define this to force CPU overtemp to 60 degree, useful for testing
40 * the overtemp code
41 */
42#undef HACKED_OVERTEMP
43
44/* We currently only handle 2 chips, 4 cores... */
45#define NR_CHIPS 2
46#define NR_CORES 4
47#define NR_CPU_FANS 3 * NR_CHIPS
48
49/* Controls and sensors */
50static struct wf_sensor *sens_cpu_temp[NR_CORES];
51static struct wf_sensor *sens_cpu_power[NR_CORES];
52static struct wf_sensor *hd_temp;
53static struct wf_sensor *slots_power;
54static struct wf_sensor *u4_temp;
55
56static struct wf_control *cpu_fans[NR_CPU_FANS];
57static char *cpu_fan_names[NR_CPU_FANS] = {
58 "cpu-rear-fan-0",
59 "cpu-rear-fan-1",
60 "cpu-front-fan-0",
61 "cpu-front-fan-1",
62 "cpu-pump-0",
63 "cpu-pump-1",
64};
65static struct wf_control *cpufreq_clamp;
66
67/* Second pump isn't required (and isn't actually present) */
68#define CPU_FANS_REQD (NR_CPU_FANS - 2)
69#define FIRST_PUMP 4
70#define LAST_PUMP 5
71
72/* We keep a temperature history for average calculation of 180s */
73#define CPU_TEMP_HIST_SIZE 180
74
75/* Scale factor for fan speed, *100 */
76static int cpu_fan_scale[NR_CPU_FANS] = {
77 100,
78 100,
79 97, /* inlet fans run at 97% of exhaust fan */
80 97,
81 100, /* updated later */
82 100, /* updated later */
83};
84
85static struct wf_control *backside_fan;
86static struct wf_control *slots_fan;
87static struct wf_control *drive_bay_fan;
88
89/* PID loop state */
90static struct wf_cpu_pid_state cpu_pid[NR_CORES];
91static u32 cpu_thist[CPU_TEMP_HIST_SIZE];
92static int cpu_thist_pt;
93static s64 cpu_thist_total;
94static s32 cpu_all_tmax = 100 << 16;
95static int cpu_last_target;
96static struct wf_pid_state backside_pid;
97static int backside_tick;
98static struct wf_pid_state slots_pid;
99static int slots_started;
100static struct wf_pid_state drive_bay_pid;
101static int drive_bay_tick;
102
103static int nr_cores;
104static int have_all_controls;
105static int have_all_sensors;
106static int started;
107
108static int failure_state;
109#define FAILURE_SENSOR 1
110#define FAILURE_FAN 2
111#define FAILURE_PERM 4
112#define FAILURE_LOW_OVERTEMP 8
113#define FAILURE_HIGH_OVERTEMP 16
114
115/* Overtemp values */
116#define LOW_OVER_AVERAGE 0
117#define LOW_OVER_IMMEDIATE (10 << 16)
118#define LOW_OVER_CLEAR ((-10) << 16)
119#define HIGH_OVER_IMMEDIATE (14 << 16)
120#define HIGH_OVER_AVERAGE (10 << 16)
121#define HIGH_OVER_IMMEDIATE (14 << 16)
122
123
124/* Implementation... */
125static int create_cpu_loop(int cpu)
126{
127 int chip = cpu / 2;
128 int core = cpu & 1;
129 struct smu_sdbp_header *hdr;
130 struct smu_sdbp_cpupiddata *piddata;
131 struct wf_cpu_pid_param pid;
132 struct wf_control *main_fan = cpu_fans[0];
133 s32 tmax;
134 int fmin;
135
136 /* Get PID params from the appropriate SAT */
137 hdr = smu_sat_get_sdb_partition(chip, 0xC8 + core, NULL);
138 if (hdr == NULL) {
139 printk(KERN_WARNING"windfarm: can't get CPU PID fan config\n");
140 return -EINVAL;
141 }
142 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
143
144 /* Get FVT params to get Tmax; if not found, assume default */
145 hdr = smu_sat_get_sdb_partition(chip, 0xC4 + core, NULL);
146 if (hdr) {
147 struct smu_sdbp_fvt *fvt = (struct smu_sdbp_fvt *)&hdr[1];
148 tmax = fvt->maxtemp << 16;
149 } else
150 tmax = 95 << 16; /* default to 95 degrees C */
151
152 /* We keep a global tmax for overtemp calculations */
153 if (tmax < cpu_all_tmax)
154 cpu_all_tmax = tmax;
155
156 /*
157 * Darwin has a minimum fan speed of 1000 rpm for the 4-way and
158 * 515 for the 2-way. That appears to be overkill, so for now,
159 * impose a minimum of 750 or 515.
160 */
161 fmin = (nr_cores > 2) ? 750 : 515;
162
163 /* Initialize PID loop */
164 pid.interval = 1; /* seconds */
165 pid.history_len = piddata->history_len;
166 pid.gd = piddata->gd;
167 pid.gp = piddata->gp;
168 pid.gr = piddata->gr / piddata->history_len;
169 pid.pmaxadj = (piddata->max_power << 16) - (piddata->power_adj << 8);
170 pid.ttarget = tmax - (piddata->target_temp_delta << 16);
171 pid.tmax = tmax;
172 pid.min = main_fan->ops->get_min(main_fan);
173 pid.max = main_fan->ops->get_max(main_fan);
174 if (pid.min < fmin)
175 pid.min = fmin;
176
177 wf_cpu_pid_init(&cpu_pid[cpu], &pid);
178 return 0;
179}
180
181static void cpu_max_all_fans(void)
182{
183 int i;
184
185 /* We max all CPU fans in case of a sensor error. We also do the
186 * cpufreq clamping now, even if it's supposedly done later by the
187 * generic code anyway, we do it earlier here to react faster
188 */
189 if (cpufreq_clamp)
190 wf_control_set_max(cpufreq_clamp);
191 for (i = 0; i < NR_CPU_FANS; ++i)
192 if (cpu_fans[i])
193 wf_control_set_max(cpu_fans[i]);
194}
195
196static int cpu_check_overtemp(s32 temp)
197{
198 int new_state = 0;
199 s32 t_avg, t_old;
200
201 /* First check for immediate overtemps */
202 if (temp >= (cpu_all_tmax + LOW_OVER_IMMEDIATE)) {
203 new_state |= FAILURE_LOW_OVERTEMP;
204 if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
205 printk(KERN_ERR "windfarm: Overtemp due to immediate CPU"
206 " temperature !\n");
207 }
208 if (temp >= (cpu_all_tmax + HIGH_OVER_IMMEDIATE)) {
209 new_state |= FAILURE_HIGH_OVERTEMP;
210 if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
211 printk(KERN_ERR "windfarm: Critical overtemp due to"
212 " immediate CPU temperature !\n");
213 }
214
215 /* We calculate a history of max temperatures and use that for the
216 * overtemp management
217 */
218 t_old = cpu_thist[cpu_thist_pt];
219 cpu_thist[cpu_thist_pt] = temp;
220 cpu_thist_pt = (cpu_thist_pt + 1) % CPU_TEMP_HIST_SIZE;
221 cpu_thist_total -= t_old;
222 cpu_thist_total += temp;
223 t_avg = cpu_thist_total / CPU_TEMP_HIST_SIZE;
224
225 DBG_LOTS("t_avg = %d.%03d (out: %d.%03d, in: %d.%03d)\n",
226 FIX32TOPRINT(t_avg), FIX32TOPRINT(t_old), FIX32TOPRINT(temp));
227
228 /* Now check for average overtemps */
229 if (t_avg >= (cpu_all_tmax + LOW_OVER_AVERAGE)) {
230 new_state |= FAILURE_LOW_OVERTEMP;
231 if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
232 printk(KERN_ERR "windfarm: Overtemp due to average CPU"
233 " temperature !\n");
234 }
235 if (t_avg >= (cpu_all_tmax + HIGH_OVER_AVERAGE)) {
236 new_state |= FAILURE_HIGH_OVERTEMP;
237 if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
238 printk(KERN_ERR "windfarm: Critical overtemp due to"
239 " average CPU temperature !\n");
240 }
241
242 /* Now handle overtemp conditions. We don't currently use the windfarm
243 * overtemp handling core as it's not fully suited to the needs of those
244 * new machine. This will be fixed later.
245 */
246 if (new_state) {
247 /* High overtemp -> immediate shutdown */
248 if (new_state & FAILURE_HIGH_OVERTEMP)
249 machine_power_off();
250 if ((failure_state & new_state) != new_state)
251 cpu_max_all_fans();
252 failure_state |= new_state;
253 } else if ((failure_state & FAILURE_LOW_OVERTEMP) &&
254 (temp < (cpu_all_tmax + LOW_OVER_CLEAR))) {
255 printk(KERN_ERR "windfarm: Overtemp condition cleared !\n");
256 failure_state &= ~FAILURE_LOW_OVERTEMP;
257 }
258
259 return failure_state & (FAILURE_LOW_OVERTEMP | FAILURE_HIGH_OVERTEMP);
260}
261
262static void cpu_fans_tick(void)
263{
264 int err, cpu;
265 s32 greatest_delta = 0;
266 s32 temp, power, t_max = 0;
267 int i, t, target = 0;
268 struct wf_sensor *sr;
269 struct wf_control *ct;
270 struct wf_cpu_pid_state *sp;
271
272 DBG_LOTS(KERN_DEBUG);
273 for (cpu = 0; cpu < nr_cores; ++cpu) {
274 /* Get CPU core temperature */
275 sr = sens_cpu_temp[cpu];
276 err = sr->ops->get_value(sr, &temp);
277 if (err) {
278 DBG("\n");
279 printk(KERN_WARNING "windfarm: CPU %d temperature "
280 "sensor error %d\n", cpu, err);
281 failure_state |= FAILURE_SENSOR;
282 cpu_max_all_fans();
283 return;
284 }
285
286 /* Keep track of highest temp */
287 t_max = max(t_max, temp);
288
289 /* Get CPU power */
290 sr = sens_cpu_power[cpu];
291 err = sr->ops->get_value(sr, &power);
292 if (err) {
293 DBG("\n");
294 printk(KERN_WARNING "windfarm: CPU %d power "
295 "sensor error %d\n", cpu, err);
296 failure_state |= FAILURE_SENSOR;
297 cpu_max_all_fans();
298 return;
299 }
300
301 /* Run PID */
302 sp = &cpu_pid[cpu];
303 t = wf_cpu_pid_run(sp, power, temp);
304
305 if (cpu == 0 || sp->last_delta > greatest_delta) {
306 greatest_delta = sp->last_delta;
307 target = t;
308 }
309 DBG_LOTS("[%d] P=%d.%.3d T=%d.%.3d ",
310 cpu, FIX32TOPRINT(power), FIX32TOPRINT(temp));
311 }
312 DBG_LOTS("fans = %d, t_max = %d.%03d\n", target, FIX32TOPRINT(t_max));
313
314 /* Darwin limits decrease to 20 per iteration */
315 if (target < (cpu_last_target - 20))
316 target = cpu_last_target - 20;
317 cpu_last_target = target;
318 for (cpu = 0; cpu < nr_cores; ++cpu)
319 cpu_pid[cpu].target = target;
320
321 /* Handle possible overtemps */
322 if (cpu_check_overtemp(t_max))
323 return;
324
325 /* Set fans */
326 for (i = 0; i < NR_CPU_FANS; ++i) {
327 ct = cpu_fans[i];
328 if (ct == NULL)
329 continue;
330 err = ct->ops->set_value(ct, target * cpu_fan_scale[i] / 100);
331 if (err) {
332 printk(KERN_WARNING "windfarm: fan %s reports "
333 "error %d\n", ct->name, err);
334 failure_state |= FAILURE_FAN;
335 break;
336 }
337 }
338}
339
340/* Backside/U4 fan */
341static struct wf_pid_param backside_param = {
342 .interval = 5,
343 .history_len = 2,
344 .gd = 48 << 20,
345 .gp = 5 << 20,
346 .gr = 0,
347 .itarget = 64 << 16,
348 .additive = 1,
349};
350
351static void backside_fan_tick(void)
352{
353 s32 temp;
354 int speed;
355 int err;
356
357 if (!backside_fan || !u4_temp)
358 return;
359 if (!backside_tick) {
360 /* first time; initialize things */
361 printk(KERN_INFO "windfarm: Backside control loop started.\n");
362 backside_param.min = backside_fan->ops->get_min(backside_fan);
363 backside_param.max = backside_fan->ops->get_max(backside_fan);
364 wf_pid_init(&backside_pid, &backside_param);
365 backside_tick = 1;
366 }
367 if (--backside_tick > 0)
368 return;
369 backside_tick = backside_pid.param.interval;
370
371 err = u4_temp->ops->get_value(u4_temp, &temp);
372 if (err) {
373 printk(KERN_WARNING "windfarm: U4 temp sensor error %d\n",
374 err);
375 failure_state |= FAILURE_SENSOR;
376 wf_control_set_max(backside_fan);
377 return;
378 }
379 speed = wf_pid_run(&backside_pid, temp);
380 DBG_LOTS("backside PID temp=%d.%.3d speed=%d\n",
381 FIX32TOPRINT(temp), speed);
382
383 err = backside_fan->ops->set_value(backside_fan, speed);
384 if (err) {
385 printk(KERN_WARNING "windfarm: backside fan error %d\n", err);
386 failure_state |= FAILURE_FAN;
387 }
388}
389
390/* Drive bay fan */
391static struct wf_pid_param drive_bay_prm = {
392 .interval = 5,
393 .history_len = 2,
394 .gd = 30 << 20,
395 .gp = 5 << 20,
396 .gr = 0,
397 .itarget = 40 << 16,
398 .additive = 1,
399};
400
401static void drive_bay_fan_tick(void)
402{
403 s32 temp;
404 int speed;
405 int err;
406
407 if (!drive_bay_fan || !hd_temp)
408 return;
409 if (!drive_bay_tick) {
410 /* first time; initialize things */
411 printk(KERN_INFO "windfarm: Drive bay control loop started.\n");
412 drive_bay_prm.min = drive_bay_fan->ops->get_min(drive_bay_fan);
413 drive_bay_prm.max = drive_bay_fan->ops->get_max(drive_bay_fan);
414 wf_pid_init(&drive_bay_pid, &drive_bay_prm);
415 drive_bay_tick = 1;
416 }
417 if (--drive_bay_tick > 0)
418 return;
419 drive_bay_tick = drive_bay_pid.param.interval;
420
421 err = hd_temp->ops->get_value(hd_temp, &temp);
422 if (err) {
423 printk(KERN_WARNING "windfarm: drive bay temp sensor "
424 "error %d\n", err);
425 failure_state |= FAILURE_SENSOR;
426 wf_control_set_max(drive_bay_fan);
427 return;
428 }
429 speed = wf_pid_run(&drive_bay_pid, temp);
430 DBG_LOTS("drive_bay PID temp=%d.%.3d speed=%d\n",
431 FIX32TOPRINT(temp), speed);
432
433 err = drive_bay_fan->ops->set_value(drive_bay_fan, speed);
434 if (err) {
435 printk(KERN_WARNING "windfarm: drive bay fan error %d\n", err);
436 failure_state |= FAILURE_FAN;
437 }
438}
439
440/* PCI slots area fan */
441/* This makes the fan speed proportional to the power consumed */
442static struct wf_pid_param slots_param = {
443 .interval = 1,
444 .history_len = 2,
445 .gd = 0,
446 .gp = 0,
447 .gr = 0x1277952,
448 .itarget = 0,
449 .min = 1560,
450 .max = 3510,
451};
452
453static void slots_fan_tick(void)
454{
455 s32 power;
456 int speed;
457 int err;
458
459 if (!slots_fan || !slots_power)
460 return;
461 if (!slots_started) {
462 /* first time; initialize things */
463 printk(KERN_INFO "windfarm: Slots control loop started.\n");
464 wf_pid_init(&slots_pid, &slots_param);
465 slots_started = 1;
466 }
467
468 err = slots_power->ops->get_value(slots_power, &power);
469 if (err) {
470 printk(KERN_WARNING "windfarm: slots power sensor error %d\n",
471 err);
472 failure_state |= FAILURE_SENSOR;
473 wf_control_set_max(slots_fan);
474 return;
475 }
476 speed = wf_pid_run(&slots_pid, power);
477 DBG_LOTS("slots PID power=%d.%.3d speed=%d\n",
478 FIX32TOPRINT(power), speed);
479
480 err = slots_fan->ops->set_value(slots_fan, speed);
481 if (err) {
482 printk(KERN_WARNING "windfarm: slots fan error %d\n", err);
483 failure_state |= FAILURE_FAN;
484 }
485}
486
487static void set_fail_state(void)
488{
489 int i;
490
491 if (cpufreq_clamp)
492 wf_control_set_max(cpufreq_clamp);
493 for (i = 0; i < NR_CPU_FANS; ++i)
494 if (cpu_fans[i])
495 wf_control_set_max(cpu_fans[i]);
496 if (backside_fan)
497 wf_control_set_max(backside_fan);
498 if (slots_fan)
499 wf_control_set_max(slots_fan);
500 if (drive_bay_fan)
501 wf_control_set_max(drive_bay_fan);
502}
503
504static void pm112_tick(void)
505{
506 int i, last_failure;
507
508 if (!started) {
509 started = 1;
510 printk(KERN_INFO "windfarm: CPUs control loops started.\n");
511 for (i = 0; i < nr_cores; ++i) {
512 if (create_cpu_loop(i) < 0) {
513 failure_state = FAILURE_PERM;
514 set_fail_state();
515 break;
516 }
517 }
518 DBG_LOTS("cpu_all_tmax=%d.%03d\n", FIX32TOPRINT(cpu_all_tmax));
519
520#ifdef HACKED_OVERTEMP
521 cpu_all_tmax = 60 << 16;
522#endif
523 }
524
525 /* Permanent failure, bail out */
526 if (failure_state & FAILURE_PERM)
527 return;
528 /* Clear all failure bits except low overtemp which will be eventually
529 * cleared by the control loop itself
530 */
531 last_failure = failure_state;
532 failure_state &= FAILURE_LOW_OVERTEMP;
533 cpu_fans_tick();
534 backside_fan_tick();
535 slots_fan_tick();
536 drive_bay_fan_tick();
537
538 DBG_LOTS("last_failure: 0x%x, failure_state: %x\n",
539 last_failure, failure_state);
540
541 /* Check for failures. Any failure causes cpufreq clamping */
542 if (failure_state && last_failure == 0 && cpufreq_clamp)
543 wf_control_set_max(cpufreq_clamp);
544 if (failure_state == 0 && last_failure && cpufreq_clamp)
545 wf_control_set_min(cpufreq_clamp);
546
547 /* That's it for now, we might want to deal with other failures
548 * differently in the future though
549 */
550}
551
552static void pm112_new_control(struct wf_control *ct)
553{
554 int i, max_exhaust;
555
556 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
557 if (wf_get_control(ct) == 0)
558 cpufreq_clamp = ct;
559 }
560
561 for (i = 0; i < NR_CPU_FANS; ++i) {
562 if (!strcmp(ct->name, cpu_fan_names[i])) {
563 if (cpu_fans[i] == NULL && wf_get_control(ct) == 0)
564 cpu_fans[i] = ct;
565 break;
566 }
567 }
568 if (i >= NR_CPU_FANS) {
569 /* not a CPU fan, try the others */
570 if (!strcmp(ct->name, "backside-fan")) {
571 if (backside_fan == NULL && wf_get_control(ct) == 0)
572 backside_fan = ct;
573 } else if (!strcmp(ct->name, "slots-fan")) {
574 if (slots_fan == NULL && wf_get_control(ct) == 0)
575 slots_fan = ct;
576 } else if (!strcmp(ct->name, "drive-bay-fan")) {
577 if (drive_bay_fan == NULL && wf_get_control(ct) == 0)
578 drive_bay_fan = ct;
579 }
580 return;
581 }
582
583 for (i = 0; i < CPU_FANS_REQD; ++i)
584 if (cpu_fans[i] == NULL)
585 return;
586
587 /* work out pump scaling factors */
588 max_exhaust = cpu_fans[0]->ops->get_max(cpu_fans[0]);
589 for (i = FIRST_PUMP; i <= LAST_PUMP; ++i)
590 if ((ct = cpu_fans[i]) != NULL)
591 cpu_fan_scale[i] =
592 ct->ops->get_max(ct) * 100 / max_exhaust;
593
594 have_all_controls = 1;
595}
596
597static void pm112_new_sensor(struct wf_sensor *sr)
598{
599 unsigned int i;
600
601 if (!strncmp(sr->name, "cpu-temp-", 9)) {
602 i = sr->name[9] - '0';
603 if (sr->name[10] == 0 && i < NR_CORES &&
604 sens_cpu_temp[i] == NULL && wf_get_sensor(sr) == 0)
605 sens_cpu_temp[i] = sr;
606
607 } else if (!strncmp(sr->name, "cpu-power-", 10)) {
608 i = sr->name[10] - '0';
609 if (sr->name[11] == 0 && i < NR_CORES &&
610 sens_cpu_power[i] == NULL && wf_get_sensor(sr) == 0)
611 sens_cpu_power[i] = sr;
612 } else if (!strcmp(sr->name, "hd-temp")) {
613 if (hd_temp == NULL && wf_get_sensor(sr) == 0)
614 hd_temp = sr;
615 } else if (!strcmp(sr->name, "slots-power")) {
616 if (slots_power == NULL && wf_get_sensor(sr) == 0)
617 slots_power = sr;
618 } else if (!strcmp(sr->name, "backside-temp")) {
619 if (u4_temp == NULL && wf_get_sensor(sr) == 0)
620 u4_temp = sr;
621 } else
622 return;
623
624 /* check if we have all the sensors we need */
625 for (i = 0; i < nr_cores; ++i)
626 if (sens_cpu_temp[i] == NULL || sens_cpu_power[i] == NULL)
627 return;
628
629 have_all_sensors = 1;
630}
631
632static int pm112_wf_notify(struct notifier_block *self,
633 unsigned long event, void *data)
634{
635 switch (event) {
636 case WF_EVENT_NEW_SENSOR:
637 pm112_new_sensor(data);
638 break;
639 case WF_EVENT_NEW_CONTROL:
640 pm112_new_control(data);
641 break;
642 case WF_EVENT_TICK:
643 if (have_all_controls && have_all_sensors)
644 pm112_tick();
645 }
646 return 0;
647}
648
649static struct notifier_block pm112_events = {
650 .notifier_call = pm112_wf_notify,
651};
652
653static int wf_pm112_probe(struct platform_device *dev)
654{
655 wf_register_client(&pm112_events);
656 return 0;
657}
658
659static int wf_pm112_remove(struct platform_device *dev)
660{
661 wf_unregister_client(&pm112_events);
662 /* should release all sensors and controls */
663 return 0;
664}
665
666static struct platform_driver wf_pm112_driver = {
667 .probe = wf_pm112_probe,
668 .remove = wf_pm112_remove,
669 .driver = {
670 .name = "windfarm",
671 .owner = THIS_MODULE,
672 },
673};
674
675static int __init wf_pm112_init(void)
676{
677 struct device_node *cpu;
678
679 if (!of_machine_is_compatible("PowerMac11,2"))
680 return -ENODEV;
681
682 /* Count the number of CPU cores */
683 nr_cores = 0;
684 for_each_node_by_type(cpu, "cpu")
685 ++nr_cores;
686
687 printk(KERN_INFO "windfarm: initializing for dual-core desktop G5\n");
688
689#ifdef MODULE
690 request_module("windfarm_smu_controls");
691 request_module("windfarm_smu_sensors");
692 request_module("windfarm_smu_sat");
693 request_module("windfarm_lm75_sensor");
694 request_module("windfarm_max6690_sensor");
695 request_module("windfarm_cpufreq_clamp");
696
697#endif /* MODULE */
698
699 platform_driver_register(&wf_pm112_driver);
700 return 0;
701}
702
703static void __exit wf_pm112_exit(void)
704{
705 platform_driver_unregister(&wf_pm112_driver);
706}
707
708module_init(wf_pm112_init);
709module_exit(wf_pm112_exit);
710
711MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
712MODULE_DESCRIPTION("Thermal control for PowerMac11,2");
713MODULE_LICENSE("GPL");
714MODULE_ALIAS("platform:windfarm");