ia64/linux-2.6.18-xen.hg

view drivers/macintosh/windfarm_pm112.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
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>
19 #include "windfarm.h"
20 #include "windfarm_pid.h"
22 #define VERSION "0.2"
24 #define DEBUG
25 #undef LOTSA_DEBUG
27 #ifdef DEBUG
28 #define DBG(args...) printk(args)
29 #else
30 #define DBG(args...) do { } while(0)
31 #endif
33 #ifdef LOTSA_DEBUG
34 #define DBG_LOTS(args...) printk(args)
35 #else
36 #define DBG_LOTS(args...) do { } while(0)
37 #endif
39 /* define this to force CPU overtemp to 60 degree, useful for testing
40 * the overtemp code
41 */
42 #undef HACKED_OVERTEMP
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
49 /* Controls and sensors */
50 static struct wf_sensor *sens_cpu_temp[NR_CORES];
51 static struct wf_sensor *sens_cpu_power[NR_CORES];
52 static struct wf_sensor *hd_temp;
53 static struct wf_sensor *slots_power;
54 static struct wf_sensor *u4_temp;
56 static struct wf_control *cpu_fans[NR_CPU_FANS];
57 static 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 };
65 static struct wf_control *cpufreq_clamp;
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
72 /* We keep a temperature history for average calculation of 180s */
73 #define CPU_TEMP_HIST_SIZE 180
75 /* Scale factor for fan speed, *100 */
76 static 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 };
85 static struct wf_control *backside_fan;
86 static struct wf_control *slots_fan;
87 static struct wf_control *drive_bay_fan;
89 /* PID loop state */
90 static struct wf_cpu_pid_state cpu_pid[NR_CORES];
91 static u32 cpu_thist[CPU_TEMP_HIST_SIZE];
92 static int cpu_thist_pt;
93 static s64 cpu_thist_total;
94 static s32 cpu_all_tmax = 100 << 16;
95 static int cpu_last_target;
96 static struct wf_pid_state backside_pid;
97 static int backside_tick;
98 static struct wf_pid_state slots_pid;
99 static int slots_started;
100 static struct wf_pid_state drive_bay_pid;
101 static int drive_bay_tick;
103 static int nr_cores;
104 static int have_all_controls;
105 static int have_all_sensors;
106 static int started;
108 static 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
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)
124 /* Implementation... */
125 static 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;
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];
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 */
152 /* We keep a global tmax for overtemp calculations */
153 if (tmax < cpu_all_tmax)
154 cpu_all_tmax = tmax;
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;
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;
177 wf_cpu_pid_init(&cpu_pid[cpu], &pid);
178 return 0;
179 }
181 static void cpu_max_all_fans(void)
182 {
183 int i;
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 }
196 static int cpu_check_overtemp(s32 temp)
197 {
198 int new_state = 0;
199 s32 t_avg, t_old;
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 }
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;
225 DBG_LOTS("t_avg = %d.%03d (out: %d.%03d, in: %d.%03d)\n",
226 FIX32TOPRINT(t_avg), FIX32TOPRINT(t_old), FIX32TOPRINT(temp));
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 }
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 }
259 return failure_state & (FAILURE_LOW_OVERTEMP | FAILURE_HIGH_OVERTEMP);
260 }
262 static 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;
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 }
286 /* Keep track of highest temp */
287 t_max = max(t_max, temp);
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 }
301 /* Run PID */
302 sp = &cpu_pid[cpu];
303 t = wf_cpu_pid_run(sp, power, temp);
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));
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;
321 /* Handle possible overtemps */
322 if (cpu_check_overtemp(t_max))
323 return;
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 }
340 /* Backside/U4 fan */
341 static 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 };
351 static void backside_fan_tick(void)
352 {
353 s32 temp;
354 int speed;
355 int err;
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;
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);
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 }
390 /* Drive bay fan */
391 static 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 };
401 static void drive_bay_fan_tick(void)
402 {
403 s32 temp;
404 int speed;
405 int err;
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;
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);
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 }
440 /* PCI slots area fan */
441 /* This makes the fan speed proportional to the power consumed */
442 static 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 };
453 static void slots_fan_tick(void)
454 {
455 s32 power;
456 int speed;
457 int err;
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 }
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);
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 }
487 static void set_fail_state(void)
488 {
489 int i;
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 }
504 static void pm112_tick(void)
505 {
506 int i, last_failure;
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));
520 #ifdef HACKED_OVERTEMP
521 cpu_all_tmax = 60 << 16;
522 #endif
523 }
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();
538 DBG_LOTS("last_failure: 0x%x, failure_state: %x\n",
539 last_failure, failure_state);
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);
547 /* That's it for now, we might want to deal with other failures
548 * differently in the future though
549 */
550 }
552 static void pm112_new_control(struct wf_control *ct)
553 {
554 int i, max_exhaust;
556 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
557 if (wf_get_control(ct) == 0)
558 cpufreq_clamp = ct;
559 }
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 }
583 for (i = 0; i < CPU_FANS_REQD; ++i)
584 if (cpu_fans[i] == NULL)
585 return;
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;
594 have_all_controls = 1;
595 }
597 static void pm112_new_sensor(struct wf_sensor *sr)
598 {
599 unsigned int i;
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;
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;
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;
629 have_all_sensors = 1;
630 }
632 static 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 }
649 static struct notifier_block pm112_events = {
650 .notifier_call = pm112_wf_notify,
651 };
653 static int wf_pm112_probe(struct device *dev)
654 {
655 wf_register_client(&pm112_events);
656 return 0;
657 }
659 static int wf_pm112_remove(struct device *dev)
660 {
661 wf_unregister_client(&pm112_events);
662 /* should release all sensors and controls */
663 return 0;
664 }
666 static struct device_driver wf_pm112_driver = {
667 .name = "windfarm",
668 .bus = &platform_bus_type,
669 .probe = wf_pm112_probe,
670 .remove = wf_pm112_remove,
671 };
673 static int __init wf_pm112_init(void)
674 {
675 struct device_node *cpu;
677 if (!machine_is_compatible("PowerMac11,2"))
678 return -ENODEV;
680 /* Count the number of CPU cores */
681 nr_cores = 0;
682 for (cpu = NULL; (cpu = of_find_node_by_type(cpu, "cpu")) != NULL; )
683 ++nr_cores;
685 printk(KERN_INFO "windfarm: initializing for dual-core desktop G5\n");
686 driver_register(&wf_pm112_driver);
687 return 0;
688 }
690 static void __exit wf_pm112_exit(void)
691 {
692 driver_unregister(&wf_pm112_driver);
693 }
695 module_init(wf_pm112_init);
696 module_exit(wf_pm112_exit);
698 MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
699 MODULE_DESCRIPTION("Thermal control for PowerMac11,2");
700 MODULE_LICENSE("GPL");