Root/drivers/macintosh/windfarm_pm112.c

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 __devexit 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 = __devexit_p(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 (cpu = NULL; (cpu = of_find_node_by_type(cpu, "cpu")) != NULL; )
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");
715

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