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windfarm_pm121.c
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1 /*
2  * Windfarm PowerMac thermal control. iMac G5 iSight
3  *
4  * (c) Copyright 2007 Étienne Bersac <[email protected]>
5  *
6  * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin
7  * Herrenschmidt, IBM Corp. <[email protected]>
8  *
9  * Released under the term of the GNU GPL v2.
10  *
11  *
12  *
13  * PowerMac12,1
14  * ============
15  *
16  *
17  * The algorithm used is the PID control algorithm, used the same way
18  * the published Darwin code does, using the same values that are
19  * present in the Darwin 8.10 snapshot property lists (note however
20  * that none of the code has been re-used, it's a complete
21  * re-implementation
22  *
23  * There is two models using PowerMac12,1. Model 2 is iMac G5 iSight
24  * 17" while Model 3 is iMac G5 20". They do have both the same
25  * controls with a tiny difference. The control-ids of hard-drive-fan
26  * and cpu-fan is swapped.
27  *
28  *
29  * Target Correction :
30  *
31  * controls have a target correction calculated as :
32  *
33  * new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value
34  * new_value = max(new_value, max(new_min, 0))
35  *
36  * OD Fan control correction.
37  *
38  * # model_id: 2
39  * offset : -19563152
40  * slope : 1956315
41  *
42  * # model_id: 3
43  * offset : -15650652
44  * slope : 1565065
45  *
46  * HD Fan control correction.
47  *
48  * # model_id: 2
49  * offset : -15650652
50  * slope : 1565065
51  *
52  * # model_id: 3
53  * offset : -19563152
54  * slope : 1956315
55  *
56  * CPU Fan control correction.
57  *
58  * # model_id: 2
59  * offset : -25431900
60  * slope : 2543190
61  *
62  * # model_id: 3
63  * offset : -15650652
64  * slope : 1565065
65  *
66  *
67  * Target rubber-banding :
68  *
69  * Some controls have a target correction which depends on another
70  * control value. The correction is computed in the following way :
71  *
72  * new_min = ref_value * slope + offset
73  *
74  * ref_value is the value of the reference control. If new_min is
75  * greater than 0, then we correct the target value using :
76  *
77  * new_target = max (new_target, new_min >> 16)
78  *
79  *
80  * # model_id : 2
81  * control : cpu-fan
82  * ref : optical-drive-fan
83  * offset : -15650652
84  * slope : 1565065
85  *
86  * # model_id : 3
87  * control : optical-drive-fan
88  * ref : hard-drive-fan
89  * offset : -32768000
90  * slope : 65536
91  *
92  *
93  * In order to have the moste efficient correction with those
94  * dependencies, we must trigger HD loop before OD loop before CPU
95  * loop.
96  *
97  *
98  * The various control loops found in Darwin config file are:
99  *
100  * HD Fan control loop.
101  *
102  * # model_id: 2
103  * control : hard-drive-fan
104  * sensor : hard-drive-temp
105  * PID params : G_d = 0x00000000
106  * G_p = 0x002D70A3
107  * G_r = 0x00019999
108  * History = 2 entries
109  * Input target = 0x370000
110  * Interval = 5s
111  *
112  * # model_id: 3
113  * control : hard-drive-fan
114  * sensor : hard-drive-temp
115  * PID params : G_d = 0x00000000
116  * G_p = 0x002170A3
117  * G_r = 0x00019999
118  * History = 2 entries
119  * Input target = 0x370000
120  * Interval = 5s
121  *
122  * OD Fan control loop.
123  *
124  * # model_id: 2
125  * control : optical-drive-fan
126  * sensor : optical-drive-temp
127  * PID params : G_d = 0x00000000
128  * G_p = 0x001FAE14
129  * G_r = 0x00019999
130  * History = 2 entries
131  * Input target = 0x320000
132  * Interval = 5s
133  *
134  * # model_id: 3
135  * control : optical-drive-fan
136  * sensor : optical-drive-temp
137  * PID params : G_d = 0x00000000
138  * G_p = 0x001FAE14
139  * G_r = 0x00019999
140  * History = 2 entries
141  * Input target = 0x320000
142  * Interval = 5s
143  *
144  * GPU Fan control loop.
145  *
146  * # model_id: 2
147  * control : hard-drive-fan
148  * sensor : gpu-temp
149  * PID params : G_d = 0x00000000
150  * G_p = 0x002A6666
151  * G_r = 0x00019999
152  * History = 2 entries
153  * Input target = 0x5A0000
154  * Interval = 5s
155  *
156  * # model_id: 3
157  * control : cpu-fan
158  * sensor : gpu-temp
159  * PID params : G_d = 0x00000000
160  * G_p = 0x0010CCCC
161  * G_r = 0x00019999
162  * History = 2 entries
163  * Input target = 0x500000
164  * Interval = 5s
165  *
166  * KODIAK (aka northbridge) Fan control loop.
167  *
168  * # model_id: 2
169  * control : optical-drive-fan
170  * sensor : north-bridge-temp
171  * PID params : G_d = 0x00000000
172  * G_p = 0x003BD70A
173  * G_r = 0x00019999
174  * History = 2 entries
175  * Input target = 0x550000
176  * Interval = 5s
177  *
178  * # model_id: 3
179  * control : hard-drive-fan
180  * sensor : north-bridge-temp
181  * PID params : G_d = 0x00000000
182  * G_p = 0x0030F5C2
183  * G_r = 0x00019999
184  * History = 2 entries
185  * Input target = 0x550000
186  * Interval = 5s
187  *
188  * CPU Fan control loop.
189  *
190  * control : cpu-fan
191  * sensors : cpu-temp, cpu-power
192  * PID params : from SDB partition
193  *
194  *
195  * CPU Slew control loop.
196  *
197  * control : cpufreq-clamp
198  * sensor : cpu-temp
199  *
200  */
201 
202 #undef DEBUG
203 
204 #include <linux/types.h>
205 #include <linux/errno.h>
206 #include <linux/kernel.h>
207 #include <linux/delay.h>
208 #include <linux/slab.h>
209 #include <linux/init.h>
210 #include <linux/spinlock.h>
211 #include <linux/wait.h>
212 #include <linux/kmod.h>
213 #include <linux/device.h>
214 #include <linux/platform_device.h>
215 #include <asm/prom.h>
216 #include <asm/machdep.h>
217 #include <asm/io.h>
218 #include <asm/sections.h>
219 #include <asm/smu.h>
220 
221 #include "windfarm.h"
222 #include "windfarm_pid.h"
223 
224 #define VERSION "0.3"
225 
226 static int pm121_mach_model; /* machine model id */
227 
228 /* Controls & sensors */
229 static struct wf_sensor *sensor_cpu_power;
230 static struct wf_sensor *sensor_cpu_temp;
231 static struct wf_sensor *sensor_cpu_voltage;
232 static struct wf_sensor *sensor_cpu_current;
233 static struct wf_sensor *sensor_gpu_temp;
234 static struct wf_sensor *sensor_north_bridge_temp;
235 static struct wf_sensor *sensor_hard_drive_temp;
236 static struct wf_sensor *sensor_optical_drive_temp;
237 static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */
238 
239 enum {
245 };
246 static struct wf_control *controls[N_CONTROLS] = {};
247 
248 /* Set to kick the control loop into life */
249 static int pm121_all_controls_ok, pm121_all_sensors_ok, pm121_started;
250 
251 enum {
252  FAILURE_FAN = 1 << 0,
253  FAILURE_SENSOR = 1 << 1,
255 };
256 
257 /* All sys loops. Note the HD before the OD loop in order to have it
258  run before. */
259 enum {
260  LOOP_GPU, /* control = hd or cpu, but luckily,
261  it doesn't matter */
262  LOOP_HD, /* control = hd */
263  LOOP_KODIAK, /* control = hd or od */
264  LOOP_OD, /* control = od */
266 };
267 
268 static const char *loop_names[N_LOOPS] = {
269  "GPU",
270  "HD",
271  "KODIAK",
272  "OD",
273 };
274 
275 #define PM121_NUM_CONFIGS 2
276 
277 static unsigned int pm121_failure_state;
278 static int pm121_readjust, pm121_skipping;
279 static s32 average_power;
280 
282  int offset;
283  int slope;
284 };
285 
286 static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = {
287  /* FAN_OD */
288  {
289  /* MODEL 2 */
290  { .offset = -19563152,
291  .slope = 1956315
292  },
293  /* MODEL 3 */
294  { .offset = -15650652,
295  .slope = 1565065
296  },
297  },
298  /* FAN_HD */
299  {
300  /* MODEL 2 */
301  { .offset = -15650652,
302  .slope = 1565065
303  },
304  /* MODEL 3 */
305  { .offset = -19563152,
306  .slope = 1956315
307  },
308  },
309  /* FAN_CPU */
310  {
311  /* MODEL 2 */
312  { .offset = -25431900,
313  .slope = 2543190
314  },
315  /* MODEL 3 */
316  { .offset = -15650652,
317  .slope = 1565065
318  },
319  },
320  /* CPUFREQ has no correction (and is not implemented at all) */
321 };
322 
324  unsigned int control_id;
325  unsigned int ref_id;
327 };
328 
329 static struct pm121_connection pm121_connections[] = {
330  /* MODEL 2 */
331  { .control_id = FAN_CPU,
332  .ref_id = FAN_OD,
333  { .offset = -32768000,
334  .slope = 65536
335  }
336  },
337  /* MODEL 3 */
338  { .control_id = FAN_OD,
339  .ref_id = FAN_HD,
340  { .offset = -32768000,
341  .slope = 65536
342  }
343  },
344 };
345 
346 /* pointer to the current model connection */
347 static struct pm121_connection *pm121_connection;
348 
349 /*
350  * ****** System Fans Control Loop ******
351  *
352  */
353 
354 /* Since each loop handles only one control and we want to avoid
355  * writing virtual control, we store the control correction with the
356  * loop params. Some data are not set, there are common to all loop
357  * and thus, hardcoded.
358  */
360  /* purely informative since we use mach_model-2 as index */
361  int model_id;
362  struct wf_sensor **sensor; /* use sensor_id instead ? */
364  unsigned int control_id;
365 };
366 
367 static struct pm121_sys_param
368 pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = {
369  /* GPU Fan control loop */
370  {
371  { .model_id = 2,
372  .sensor = &sensor_gpu_temp,
373  .gp = 0x002A6666,
374  .itarget = 0x5A0000,
375  .control_id = FAN_HD,
376  },
377  { .model_id = 3,
378  .sensor = &sensor_gpu_temp,
379  .gp = 0x0010CCCC,
380  .itarget = 0x500000,
381  .control_id = FAN_CPU,
382  },
383  },
384  /* HD Fan control loop */
385  {
386  { .model_id = 2,
387  .sensor = &sensor_hard_drive_temp,
388  .gp = 0x002D70A3,
389  .itarget = 0x370000,
390  .control_id = FAN_HD,
391  },
392  { .model_id = 3,
393  .sensor = &sensor_hard_drive_temp,
394  .gp = 0x002170A3,
395  .itarget = 0x370000,
396  .control_id = FAN_HD,
397  },
398  },
399  /* KODIAK Fan control loop */
400  {
401  { .model_id = 2,
402  .sensor = &sensor_north_bridge_temp,
403  .gp = 0x003BD70A,
404  .itarget = 0x550000,
405  .control_id = FAN_OD,
406  },
407  { .model_id = 3,
408  .sensor = &sensor_north_bridge_temp,
409  .gp = 0x0030F5C2,
410  .itarget = 0x550000,
411  .control_id = FAN_HD,
412  },
413  },
414  /* OD Fan control loop */
415  {
416  { .model_id = 2,
417  .sensor = &sensor_optical_drive_temp,
418  .gp = 0x001FAE14,
419  .itarget = 0x320000,
420  .control_id = FAN_OD,
421  },
422  { .model_id = 3,
423  .sensor = &sensor_optical_drive_temp,
424  .gp = 0x001FAE14,
425  .itarget = 0x320000,
426  .control_id = FAN_OD,
427  },
428  },
429 };
430 
431 /* the hardcoded values */
432 #define PM121_SYS_GD 0x00000000
433 #define PM121_SYS_GR 0x00019999
434 #define PM121_SYS_HISTORY_SIZE 2
435 #define PM121_SYS_INTERVAL 5
436 
437 /* State data used by the system fans control loop
438  */
440  int ticks;
443 };
444 
446 
447 /*
448  * ****** CPU Fans Control Loop ******
449  *
450  */
451 
452 #define PM121_CPU_INTERVAL 1
453 
454 /* State data used by the cpu fans control loop
455  */
457  int ticks;
460 };
461 
462 static struct pm121_cpu_state *pm121_cpu_state;
463 
464 
465 
466 /*
467  * ***** Implementation *****
468  *
469  */
470 
471 /* correction the value using the output-low-bound correction algo */
472 static s32 pm121_correct(s32 new_setpoint,
473  unsigned int control_id,
474  s32 min)
475 {
476  s32 new_min;
477  struct pm121_correction *correction;
478  correction = &corrections[control_id][pm121_mach_model - 2];
479 
480  new_min = (average_power * correction->slope) >> 16;
481  new_min += correction->offset;
482  new_min = (new_min >> 16) + min;
483 
484  return max3(new_setpoint, new_min, 0);
485 }
486 
487 static s32 pm121_connect(unsigned int control_id, s32 setpoint)
488 {
489  s32 new_min, value, new_setpoint;
490 
491  if (pm121_connection->control_id == control_id) {
492  controls[control_id]->ops->get_value(controls[control_id],
493  &value);
494  new_min = value * pm121_connection->correction.slope;
495  new_min += pm121_connection->correction.offset;
496  if (new_min > 0) {
497  new_setpoint = max(setpoint, (new_min >> 16));
498  if (new_setpoint != setpoint) {
499  pr_debug("pm121: %s depending on %s, "
500  "corrected from %d to %d RPM\n",
501  controls[control_id]->name,
502  controls[pm121_connection->ref_id]->name,
503  (int) setpoint, (int) new_setpoint);
504  }
505  } else
506  new_setpoint = setpoint;
507  }
508  /* no connection */
509  else
510  new_setpoint = setpoint;
511 
512  return new_setpoint;
513 }
514 
515 /* FAN LOOPS */
516 static void pm121_create_sys_fans(int loop_id)
517 {
518  struct pm121_sys_param *param = NULL;
519  struct wf_pid_param pid_param;
520  struct wf_control *control = NULL;
521  int i;
522 
523  /* First, locate the params for this model */
524  for (i = 0; i < PM121_NUM_CONFIGS; i++) {
525  if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) {
526  param = &(pm121_sys_all_params[loop_id][i]);
527  break;
528  }
529  }
530 
531  /* No params found, put fans to max */
532  if (param == NULL) {
533  printk(KERN_WARNING "pm121: %s fan config not found "
534  " for this machine model\n",
535  loop_names[loop_id]);
536  goto fail;
537  }
538 
539  control = controls[param->control_id];
540 
541  /* Alloc & initialize state */
542  pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state),
543  GFP_KERNEL);
544  if (pm121_sys_state[loop_id] == NULL) {
545  printk(KERN_WARNING "pm121: Memory allocation error\n");
546  goto fail;
547  }
548  pm121_sys_state[loop_id]->ticks = 1;
549 
550  /* Fill PID params */
551  pid_param.gd = PM121_SYS_GD;
552  pid_param.gp = param->gp;
553  pid_param.gr = PM121_SYS_GR;
554  pid_param.interval = PM121_SYS_INTERVAL;
555  pid_param.history_len = PM121_SYS_HISTORY_SIZE;
556  pid_param.itarget = param->itarget;
557  pid_param.min = control->ops->get_min(control);
558  pid_param.max = control->ops->get_max(control);
559 
560  wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param);
561 
562  pr_debug("pm121: %s Fan control loop initialized.\n"
563  " itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
564  loop_names[loop_id], FIX32TOPRINT(pid_param.itarget),
565  pid_param.min, pid_param.max);
566  return;
567 
568  fail:
569  /* note that this is not optimal since another loop may still
570  control the same control */
571  printk(KERN_WARNING "pm121: failed to set up %s loop "
572  "setting \"%s\" to max speed.\n",
573  loop_names[loop_id], control->name);
574 
575  if (control)
576  wf_control_set_max(control);
577 }
578 
579 static void pm121_sys_fans_tick(int loop_id)
580 {
581  struct pm121_sys_param *param;
582  struct pm121_sys_state *st;
583  struct wf_sensor *sensor;
584  struct wf_control *control;
585  s32 temp, new_setpoint;
586  int rc;
587 
588  param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]);
589  st = pm121_sys_state[loop_id];
590  sensor = *(param->sensor);
591  control = controls[param->control_id];
592 
593  if (--st->ticks != 0) {
594  if (pm121_readjust)
595  goto readjust;
596  return;
597  }
599 
600  rc = sensor->ops->get_value(sensor, &temp);
601  if (rc) {
602  printk(KERN_WARNING "windfarm: %s sensor error %d\n",
603  sensor->name, rc);
604  pm121_failure_state |= FAILURE_SENSOR;
605  return;
606  }
607 
608  pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n",
609  loop_names[loop_id], sensor->name,
610  FIX32TOPRINT(temp));
611 
612  new_setpoint = wf_pid_run(&st->pid, temp);
613 
614  /* correction */
615  new_setpoint = pm121_correct(new_setpoint,
616  param->control_id,
617  st->pid.param.min);
618  /* linked corretion */
619  new_setpoint = pm121_connect(param->control_id, new_setpoint);
620 
621  if (new_setpoint == st->setpoint)
622  return;
623  st->setpoint = new_setpoint;
624  pr_debug("pm121: %s corrected setpoint: %d RPM\n",
625  control->name, (int)new_setpoint);
626  readjust:
627  if (control && pm121_failure_state == 0) {
628  rc = control->ops->set_value(control, st->setpoint);
629  if (rc) {
630  printk(KERN_WARNING "windfarm: %s fan error %d\n",
631  control->name, rc);
632  pm121_failure_state |= FAILURE_FAN;
633  }
634  }
635 }
636 
637 
638 /* CPU LOOP */
639 static void pm121_create_cpu_fans(void)
640 {
641  struct wf_cpu_pid_param pid_param;
642  const struct smu_sdbp_header *hdr;
643  struct smu_sdbp_cpupiddata *piddata;
644  struct smu_sdbp_fvt *fvt;
645  struct wf_control *fan_cpu;
646  s32 tmax, tdelta, maxpow, powadj;
647 
648  fan_cpu = controls[FAN_CPU];
649 
650  /* First, locate the PID params in SMU SBD */
652  if (hdr == 0) {
653  printk(KERN_WARNING "pm121: CPU PID fan config not found.\n");
654  goto fail;
655  }
656  piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
657 
658  /* Get the FVT params for operating point 0 (the only supported one
659  * for now) in order to get tmax
660  */
662  if (hdr) {
663  fvt = (struct smu_sdbp_fvt *)&hdr[1];
664  tmax = ((s32)fvt->maxtemp) << 16;
665  } else
666  tmax = 0x5e0000; /* 94 degree default */
667 
668  /* Alloc & initialize state */
669  pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state),
670  GFP_KERNEL);
671  if (pm121_cpu_state == NULL)
672  goto fail;
673  pm121_cpu_state->ticks = 1;
674 
675  /* Fill PID params */
676  pid_param.interval = PM121_CPU_INTERVAL;
677  pid_param.history_len = piddata->history_len;
678  if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
679  printk(KERN_WARNING "pm121: History size overflow on "
680  "CPU control loop (%d)\n", piddata->history_len);
681  pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
682  }
683  pid_param.gd = piddata->gd;
684  pid_param.gp = piddata->gp;
685  pid_param.gr = piddata->gr / pid_param.history_len;
686 
687  tdelta = ((s32)piddata->target_temp_delta) << 16;
688  maxpow = ((s32)piddata->max_power) << 16;
689  powadj = ((s32)piddata->power_adj) << 16;
690 
691  pid_param.tmax = tmax;
692  pid_param.ttarget = tmax - tdelta;
693  pid_param.pmaxadj = maxpow - powadj;
694 
695  pid_param.min = fan_cpu->ops->get_min(fan_cpu);
696  pid_param.max = fan_cpu->ops->get_max(fan_cpu);
697 
698  wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param);
699 
700  pr_debug("pm121: CPU Fan control initialized.\n");
701  pr_debug(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n",
702  FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
703  pid_param.min, pid_param.max);
704 
705  return;
706 
707  fail:
708  printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n");
709 
710  if (controls[CPUFREQ])
711  wf_control_set_max(controls[CPUFREQ]);
712  if (fan_cpu)
713  wf_control_set_max(fan_cpu);
714 }
715 
716 
717 static void pm121_cpu_fans_tick(struct pm121_cpu_state *st)
718 {
719  s32 new_setpoint, temp, power;
720  struct wf_control *fan_cpu = NULL;
721  int rc;
722 
723  if (--st->ticks != 0) {
724  if (pm121_readjust)
725  goto readjust;
726  return;
727  }
729 
730  fan_cpu = controls[FAN_CPU];
731 
732  rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
733  if (rc) {
734  printk(KERN_WARNING "pm121: CPU temp sensor error %d\n",
735  rc);
736  pm121_failure_state |= FAILURE_SENSOR;
737  return;
738  }
739 
740  rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
741  if (rc) {
742  printk(KERN_WARNING "pm121: CPU power sensor error %d\n",
743  rc);
744  pm121_failure_state |= FAILURE_SENSOR;
745  return;
746  }
747 
748  pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n",
749  FIX32TOPRINT(temp), FIX32TOPRINT(power));
750 
751  if (temp > st->pid.param.tmax)
752  pm121_failure_state |= FAILURE_OVERTEMP;
753 
754  new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
755 
756  /* correction */
757  new_setpoint = pm121_correct(new_setpoint,
758  FAN_CPU,
759  st->pid.param.min);
760 
761  /* connected correction */
762  new_setpoint = pm121_connect(FAN_CPU, new_setpoint);
763 
764  if (st->setpoint == new_setpoint)
765  return;
766  st->setpoint = new_setpoint;
767  pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint);
768 
769  readjust:
770  if (fan_cpu && pm121_failure_state == 0) {
771  rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint);
772  if (rc) {
773  printk(KERN_WARNING "pm121: %s fan error %d\n",
774  fan_cpu->name, rc);
775  pm121_failure_state |= FAILURE_FAN;
776  }
777  }
778 }
779 
780 /*
781  * ****** Common ******
782  *
783  */
784 
785 static void pm121_tick(void)
786 {
787  unsigned int last_failure = pm121_failure_state;
788  unsigned int new_failure;
789  s32 total_power;
790  int i;
791 
792  if (!pm121_started) {
793  pr_debug("pm121: creating control loops !\n");
794  for (i = 0; i < N_LOOPS; i++)
795  pm121_create_sys_fans(i);
796 
797  pm121_create_cpu_fans();
798  pm121_started = 1;
799  }
800 
801  /* skipping ticks */
802  if (pm121_skipping && --pm121_skipping)
803  return;
804 
805  /* compute average power */
806  total_power = 0;
807  for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++)
808  total_power += pm121_cpu_state->pid.powers[i];
809 
810  average_power = total_power / pm121_cpu_state->pid.param.history_len;
811 
812 
813  pm121_failure_state = 0;
814  for (i = 0 ; i < N_LOOPS; i++) {
815  if (pm121_sys_state[i])
816  pm121_sys_fans_tick(i);
817  }
818 
819  if (pm121_cpu_state)
820  pm121_cpu_fans_tick(pm121_cpu_state);
821 
822  pm121_readjust = 0;
823  new_failure = pm121_failure_state & ~last_failure;
824 
825  /* If entering failure mode, clamp cpufreq and ramp all
826  * fans to full speed.
827  */
828  if (pm121_failure_state && !last_failure) {
829  for (i = 0; i < N_CONTROLS; i++) {
830  if (controls[i])
831  wf_control_set_max(controls[i]);
832  }
833  }
834 
835  /* If leaving failure mode, unclamp cpufreq and readjust
836  * all fans on next iteration
837  */
838  if (!pm121_failure_state && last_failure) {
839  if (controls[CPUFREQ])
840  wf_control_set_min(controls[CPUFREQ]);
841  pm121_readjust = 1;
842  }
843 
844  /* Overtemp condition detected, notify and start skipping a couple
845  * ticks to let the temperature go down
846  */
847  if (new_failure & FAILURE_OVERTEMP) {
848  wf_set_overtemp();
849  pm121_skipping = 2;
850  }
851 
852  /* We only clear the overtemp condition if overtemp is cleared
853  * _and_ no other failure is present. Since a sensor error will
854  * clear the overtemp condition (can't measure temperature) at
855  * the control loop levels, but we don't want to keep it clear
856  * here in this case
857  */
858  if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
860 }
861 
862 
863 static struct wf_control* pm121_register_control(struct wf_control *ct,
864  const char *match,
865  unsigned int id)
866 {
867  if (controls[id] == NULL && !strcmp(ct->name, match)) {
868  if (wf_get_control(ct) == 0)
869  controls[id] = ct;
870  }
871  return controls[id];
872 }
873 
874 static void pm121_new_control(struct wf_control *ct)
875 {
876  int all = 1;
877 
878  if (pm121_all_controls_ok)
879  return;
880 
881  all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all;
882  all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all;
883  all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all;
884  all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all;
885 
886  if (all)
887  pm121_all_controls_ok = 1;
888 }
889 
890 
891 
892 
893 static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor,
894  const char *match,
895  struct wf_sensor **var)
896 {
897  if (*var == NULL && !strcmp(sensor->name, match)) {
898  if (wf_get_sensor(sensor) == 0)
899  *var = sensor;
900  }
901  return *var;
902 }
903 
904 static void pm121_new_sensor(struct wf_sensor *sr)
905 {
906  int all = 1;
907 
908  if (pm121_all_sensors_ok)
909  return;
910 
911  all = pm121_register_sensor(sr, "cpu-temp",
912  &sensor_cpu_temp) && all;
913  all = pm121_register_sensor(sr, "cpu-current",
914  &sensor_cpu_current) && all;
915  all = pm121_register_sensor(sr, "cpu-voltage",
916  &sensor_cpu_voltage) && all;
917  all = pm121_register_sensor(sr, "cpu-power",
918  &sensor_cpu_power) && all;
919  all = pm121_register_sensor(sr, "hard-drive-temp",
920  &sensor_hard_drive_temp) && all;
921  all = pm121_register_sensor(sr, "optical-drive-temp",
922  &sensor_optical_drive_temp) && all;
923  all = pm121_register_sensor(sr, "incoming-air-temp",
924  &sensor_incoming_air_temp) && all;
925  all = pm121_register_sensor(sr, "north-bridge-temp",
926  &sensor_north_bridge_temp) && all;
927  all = pm121_register_sensor(sr, "gpu-temp",
928  &sensor_gpu_temp) && all;
929 
930  if (all)
931  pm121_all_sensors_ok = 1;
932 }
933 
934 
935 
936 static int pm121_notify(struct notifier_block *self,
937  unsigned long event, void *data)
938 {
939  switch (event) {
941  pr_debug("pm121: new control %s detected\n",
942  ((struct wf_control *)data)->name);
943  pm121_new_control(data);
944  break;
945  case WF_EVENT_NEW_SENSOR:
946  pr_debug("pm121: new sensor %s detected\n",
947  ((struct wf_sensor *)data)->name);
948  pm121_new_sensor(data);
949  break;
950  case WF_EVENT_TICK:
951  if (pm121_all_controls_ok && pm121_all_sensors_ok)
952  pm121_tick();
953  break;
954  }
955 
956  return 0;
957 }
958 
959 static struct notifier_block pm121_events = {
960  .notifier_call = pm121_notify,
961 };
962 
963 static int pm121_init_pm(void)
964 {
965  const struct smu_sdbp_header *hdr;
966 
968  if (hdr != 0) {
969  struct smu_sdbp_sensortree *st =
970  (struct smu_sdbp_sensortree *)&hdr[1];
971  pm121_mach_model = st->model_id;
972  }
973 
974  pm121_connection = &pm121_connections[pm121_mach_model - 2];
975 
976  printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n",
977  pm121_mach_model);
978 
979  return 0;
980 }
981 
982 
983 static int pm121_probe(struct platform_device *ddev)
984 {
985  wf_register_client(&pm121_events);
986 
987  return 0;
988 }
989 
990 static int __devexit pm121_remove(struct platform_device *ddev)
991 {
992  wf_unregister_client(&pm121_events);
993  return 0;
994 }
995 
996 static struct platform_driver pm121_driver = {
997  .probe = pm121_probe,
998  .remove = __devexit_p(pm121_remove),
999  .driver = {
1000  .name = "windfarm",
1001  .bus = &platform_bus_type,
1002  },
1003 };
1004 
1005 
1006 static int __init pm121_init(void)
1007 {
1008  int rc = -ENODEV;
1009 
1010  if (of_machine_is_compatible("PowerMac12,1"))
1011  rc = pm121_init_pm();
1012 
1013  if (rc == 0) {
1014  request_module("windfarm_smu_controls");
1015  request_module("windfarm_smu_sensors");
1016  request_module("windfarm_smu_sat");
1017  request_module("windfarm_lm75_sensor");
1018  request_module("windfarm_max6690_sensor");
1019  request_module("windfarm_cpufreq_clamp");
1020  platform_driver_register(&pm121_driver);
1021  }
1022 
1023  return rc;
1024 }
1025 
1026 static void __exit pm121_exit(void)
1027 {
1028 
1029  platform_driver_unregister(&pm121_driver);
1030 }
1031 
1032 
1033 module_init(pm121_init);
1034 module_exit(pm121_exit);
1035 
1036 MODULE_AUTHOR("Étienne Bersac <[email protected]>");
1037 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
1038 MODULE_LICENSE("GPL");
1039