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1 /*
2 * Windfarm PowerMac thermal control. iMac G5 iSight
3 *
4 * (c) Copyright 2007 Étienne Bersac <bersace@gmail.com>
5 *
6 * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin
7 * Herrenschmidt, IBM Corp. <benh@kernel.crashing.org>
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 {
240 FAN_CPU,
241 FAN_HD,
242 FAN_OD,
243 CPUFREQ,
244 N_CONTROLS
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,
254 FAILURE_OVERTEMP = 1 << 2
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 */
265 N_LOOPS
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 bool pm121_overtemp;
280 static s32 average_power;
281
282 struct pm121_correction {
283 int offset;
284 int slope;
285 };
286
287 static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = {
288 /* FAN_OD */
289 {
290 /* MODEL 2 */
291 { .offset = -19563152,
292 .slope = 1956315
293 },
294 /* MODEL 3 */
295 { .offset = -15650652,
296 .slope = 1565065
297 },
298 },
299 /* FAN_HD */
300 {
301 /* MODEL 2 */
302 { .offset = -15650652,
303 .slope = 1565065
304 },
305 /* MODEL 3 */
306 { .offset = -19563152,
307 .slope = 1956315
308 },
309 },
310 /* FAN_CPU */
311 {
312 /* MODEL 2 */
313 { .offset = -25431900,
314 .slope = 2543190
315 },
316 /* MODEL 3 */
317 { .offset = -15650652,
318 .slope = 1565065
319 },
320 },
321 /* CPUFREQ has no correction (and is not implemented at all) */
322 };
323
324 struct pm121_connection {
325 unsigned int control_id;
326 unsigned int ref_id;
327 struct pm121_correction correction;
328 };
329
330 static struct pm121_connection pm121_connections[] = {
331 /* MODEL 2 */
332 { .control_id = FAN_CPU,
333 .ref_id = FAN_OD,
334 { .offset = -32768000,
335 .slope = 65536
336 }
337 },
338 /* MODEL 3 */
339 { .control_id = FAN_OD,
340 .ref_id = FAN_HD,
341 { .offset = -32768000,
342 .slope = 65536
343 }
344 },
345 };
346
347 /* pointer to the current model connection */
348 static struct pm121_connection *pm121_connection;
349
350 /*
351 * ****** System Fans Control Loop ******
352 *
353 */
354
355 /* Since each loop handles only one control and we want to avoid
356 * writing virtual control, we store the control correction with the
357 * loop params. Some data are not set, there are common to all loop
358 * and thus, hardcoded.
359 */
360 struct pm121_sys_param {
361 /* purely informative since we use mach_model-2 as index */
362 int model_id;
363 struct wf_sensor **sensor; /* use sensor_id instead ? */
364 s32 gp, itarget;
365 unsigned int control_id;
366 };
367
368 static struct pm121_sys_param
369 pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = {
370 /* GPU Fan control loop */
371 {
372 { .model_id = 2,
373 .sensor = &sensor_gpu_temp,
374 .gp = 0x002A6666,
375 .itarget = 0x5A0000,
376 .control_id = FAN_HD,
377 },
378 { .model_id = 3,
379 .sensor = &sensor_gpu_temp,
380 .gp = 0x0010CCCC,
381 .itarget = 0x500000,
382 .control_id = FAN_CPU,
383 },
384 },
385 /* HD Fan control loop */
386 {
387 { .model_id = 2,
388 .sensor = &sensor_hard_drive_temp,
389 .gp = 0x002D70A3,
390 .itarget = 0x370000,
391 .control_id = FAN_HD,
392 },
393 { .model_id = 3,
394 .sensor = &sensor_hard_drive_temp,
395 .gp = 0x002170A3,
396 .itarget = 0x370000,
397 .control_id = FAN_HD,
398 },
399 },
400 /* KODIAK Fan control loop */
401 {
402 { .model_id = 2,
403 .sensor = &sensor_north_bridge_temp,
404 .gp = 0x003BD70A,
405 .itarget = 0x550000,
406 .control_id = FAN_OD,
407 },
408 { .model_id = 3,
409 .sensor = &sensor_north_bridge_temp,
410 .gp = 0x0030F5C2,
411 .itarget = 0x550000,
412 .control_id = FAN_HD,
413 },
414 },
415 /* OD Fan control loop */
416 {
417 { .model_id = 2,
418 .sensor = &sensor_optical_drive_temp,
419 .gp = 0x001FAE14,
420 .itarget = 0x320000,
421 .control_id = FAN_OD,
422 },
423 { .model_id = 3,
424 .sensor = &sensor_optical_drive_temp,
425 .gp = 0x001FAE14,
426 .itarget = 0x320000,
427 .control_id = FAN_OD,
428 },
429 },
430 };
431
432 /* the hardcoded values */
433 #define PM121_SYS_GD 0x00000000
434 #define PM121_SYS_GR 0x00019999
435 #define PM121_SYS_HISTORY_SIZE 2
436 #define PM121_SYS_INTERVAL 5
437
438 /* State data used by the system fans control loop
439 */
440 struct pm121_sys_state {
441 int ticks;
442 s32 setpoint;
443 struct wf_pid_state pid;
444 };
445
446 struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
447
448 /*
449 * ****** CPU Fans Control Loop ******
450 *
451 */
452
453 #define PM121_CPU_INTERVAL 1
454
455 /* State data used by the cpu fans control loop
456 */
457 struct pm121_cpu_state {
458 int ticks;
459 s32 setpoint;
460 struct wf_cpu_pid_state pid;
461 };
462
463 static struct pm121_cpu_state *pm121_cpu_state;
464
465
466
467 /*
468 * ***** Implementation *****
469 *
470 */
471
472 /* correction the value using the output-low-bound correction algo */
473 static s32 pm121_correct(s32 new_setpoint,
474 unsigned int control_id,
475 s32 min)
476 {
477 s32 new_min;
478 struct pm121_correction *correction;
479 correction = &corrections[control_id][pm121_mach_model - 2];
480
481 new_min = (average_power * correction->slope) >> 16;
482 new_min += correction->offset;
483 new_min = (new_min >> 16) + min;
484
485 return max3(new_setpoint, new_min, 0);
486 }
487
488 static s32 pm121_connect(unsigned int control_id, s32 setpoint)
489 {
490 s32 new_min, value, new_setpoint;
491
492 if (pm121_connection->control_id == control_id) {
493 controls[control_id]->ops->get_value(controls[control_id],
494 &value);
495 new_min = value * pm121_connection->correction.slope;
496 new_min += pm121_connection->correction.offset;
497 if (new_min > 0) {
498 new_setpoint = max(setpoint, (new_min >> 16));
499 if (new_setpoint != setpoint) {
500 pr_debug("pm121: %s depending on %s, "
501 "corrected from %d to %d RPM\n",
502 controls[control_id]->name,
503 controls[pm121_connection->ref_id]->name,
504 (int) setpoint, (int) new_setpoint);
505 }
506 } else
507 new_setpoint = setpoint;
508 }
509 /* no connection */
510 else
511 new_setpoint = setpoint;
512
513 return new_setpoint;
514 }
515
516 /* FAN LOOPS */
517 static void pm121_create_sys_fans(int loop_id)
518 {
519 struct pm121_sys_param *param = NULL;
520 struct wf_pid_param pid_param;
521 struct wf_control *control = NULL;
522 int i;
523
524 /* First, locate the params for this model */
525 for (i = 0; i < PM121_NUM_CONFIGS; i++) {
526 if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) {
527 param = &(pm121_sys_all_params[loop_id][i]);
528 break;
529 }
530 }
531
532 /* No params found, put fans to max */
533 if (param == NULL) {
534 printk(KERN_WARNING "pm121: %s fan config not found "
535 " for this machine model\n",
536 loop_names[loop_id]);
537 goto fail;
538 }
539
540 control = controls[param->control_id];
541
542 /* Alloc & initialize state */
543 pm121_sys_state[loop_id] = kmalloc(sizeof(struct pm121_sys_state),
544 GFP_KERNEL);
545 if (pm121_sys_state[loop_id] == NULL) {
546 printk(KERN_WARNING "pm121: Memory allocation error\n");
547 goto fail;
548 }
549 pm121_sys_state[loop_id]->ticks = 1;
550
551 /* Fill PID params */
552 pid_param.gd = PM121_SYS_GD;
553 pid_param.gp = param->gp;
554 pid_param.gr = PM121_SYS_GR;
555 pid_param.interval = PM121_SYS_INTERVAL;
556 pid_param.history_len = PM121_SYS_HISTORY_SIZE;
557 pid_param.itarget = param->itarget;
558 if(control)
559 {
560 pid_param.min = control->ops->get_min(control);
561 pid_param.max = control->ops->get_max(control);
562 } else {
563 /*
564 * This is probably not the right!?
565 * Perhaps goto fail if control == NULL above?
566 */
567 pid_param.min = 0;
568 pid_param.max = 0;
569 }
570
571 wf_pid_init(&pm121_sys_state[loop_id]->pid, &pid_param);
572
573 pr_debug("pm121: %s Fan control loop initialized.\n"
574 " itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
575 loop_names[loop_id], FIX32TOPRINT(pid_param.itarget),
576 pid_param.min, pid_param.max);
577 return;
578
579 fail:
580 /* note that this is not optimal since another loop may still
581 control the same control */
582 printk(KERN_WARNING "pm121: failed to set up %s loop "
583 "setting \"%s\" to max speed.\n",
584 loop_names[loop_id], control ? control->name : "uninitialized value");
585
586 if (control)
587 wf_control_set_max(control);
588 }
589
590 static void pm121_sys_fans_tick(int loop_id)
591 {
592 struct pm121_sys_param *param;
593 struct pm121_sys_state *st;
594 struct wf_sensor *sensor;
595 struct wf_control *control;
596 s32 temp, new_setpoint;
597 int rc;
598
599 param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]);
600 st = pm121_sys_state[loop_id];
601 sensor = *(param->sensor);
602 control = controls[param->control_id];
603
604 if (--st->ticks != 0) {
605 if (pm121_readjust)
606 goto readjust;
607 return;
608 }
609 st->ticks = PM121_SYS_INTERVAL;
610
611 rc = sensor->ops->get_value(sensor, &temp);
612 if (rc) {
613 printk(KERN_WARNING "windfarm: %s sensor error %d\n",
614 sensor->name, rc);
615 pm121_failure_state |= FAILURE_SENSOR;
616 return;
617 }
618
619 pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n",
620 loop_names[loop_id], sensor->name,
621 FIX32TOPRINT(temp));
622
623 new_setpoint = wf_pid_run(&st->pid, temp);
624
625 /* correction */
626 new_setpoint = pm121_correct(new_setpoint,
627 param->control_id,
628 st->pid.param.min);
629 /* linked corretion */
630 new_setpoint = pm121_connect(param->control_id, new_setpoint);
631
632 if (new_setpoint == st->setpoint)
633 return;
634 st->setpoint = new_setpoint;
635 pr_debug("pm121: %s corrected setpoint: %d RPM\n",
636 control->name, (int)new_setpoint);
637 readjust:
638 if (control && pm121_failure_state == 0) {
639 rc = control->ops->set_value(control, st->setpoint);
640 if (rc) {
641 printk(KERN_WARNING "windfarm: %s fan error %d\n",
642 control->name, rc);
643 pm121_failure_state |= FAILURE_FAN;
644 }
645 }
646 }
647
648
649 /* CPU LOOP */
650 static void pm121_create_cpu_fans(void)
651 {
652 struct wf_cpu_pid_param pid_param;
653 const struct smu_sdbp_header *hdr;
654 struct smu_sdbp_cpupiddata *piddata;
655 struct smu_sdbp_fvt *fvt;
656 struct wf_control *fan_cpu;
657 s32 tmax, tdelta, maxpow, powadj;
658
659 fan_cpu = controls[FAN_CPU];
660
661 /* First, locate the PID params in SMU SBD */
662 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
663 if (hdr == 0) {
664 printk(KERN_WARNING "pm121: CPU PID fan config not found.\n");
665 goto fail;
666 }
667 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
668
669 /* Get the FVT params for operating point 0 (the only supported one
670 * for now) in order to get tmax
671 */
672 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
673 if (hdr) {
674 fvt = (struct smu_sdbp_fvt *)&hdr[1];
675 tmax = ((s32)fvt->maxtemp) << 16;
676 } else
677 tmax = 0x5e0000; /* 94 degree default */
678
679 /* Alloc & initialize state */
680 pm121_cpu_state = kmalloc(sizeof(struct pm121_cpu_state),
681 GFP_KERNEL);
682 if (pm121_cpu_state == NULL)
683 goto fail;
684 pm121_cpu_state->ticks = 1;
685
686 /* Fill PID params */
687 pid_param.interval = PM121_CPU_INTERVAL;
688 pid_param.history_len = piddata->history_len;
689 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
690 printk(KERN_WARNING "pm121: History size overflow on "
691 "CPU control loop (%d)\n", piddata->history_len);
692 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
693 }
694 pid_param.gd = piddata->gd;
695 pid_param.gp = piddata->gp;
696 pid_param.gr = piddata->gr / pid_param.history_len;
697
698 tdelta = ((s32)piddata->target_temp_delta) << 16;
699 maxpow = ((s32)piddata->max_power) << 16;
700 powadj = ((s32)piddata->power_adj) << 16;
701
702 pid_param.tmax = tmax;
703 pid_param.ttarget = tmax - tdelta;
704 pid_param.pmaxadj = maxpow - powadj;
705
706 pid_param.min = fan_cpu->ops->get_min(fan_cpu);
707 pid_param.max = fan_cpu->ops->get_max(fan_cpu);
708
709 wf_cpu_pid_init(&pm121_cpu_state->pid, &pid_param);
710
711 pr_debug("pm121: CPU Fan control initialized.\n");
712 pr_debug(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n",
713 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
714 pid_param.min, pid_param.max);
715
716 return;
717
718 fail:
719 printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n");
720
721 if (controls[CPUFREQ])
722 wf_control_set_max(controls[CPUFREQ]);
723 if (fan_cpu)
724 wf_control_set_max(fan_cpu);
725 }
726
727
728 static void pm121_cpu_fans_tick(struct pm121_cpu_state *st)
729 {
730 s32 new_setpoint, temp, power;
731 struct wf_control *fan_cpu = NULL;
732 int rc;
733
734 if (--st->ticks != 0) {
735 if (pm121_readjust)
736 goto readjust;
737 return;
738 }
739 st->ticks = PM121_CPU_INTERVAL;
740
741 fan_cpu = controls[FAN_CPU];
742
743 rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
744 if (rc) {
745 printk(KERN_WARNING "pm121: CPU temp sensor error %d\n",
746 rc);
747 pm121_failure_state |= FAILURE_SENSOR;
748 return;
749 }
750
751 rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
752 if (rc) {
753 printk(KERN_WARNING "pm121: CPU power sensor error %d\n",
754 rc);
755 pm121_failure_state |= FAILURE_SENSOR;
756 return;
757 }
758
759 pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n",
760 FIX32TOPRINT(temp), FIX32TOPRINT(power));
761
762 if (temp > st->pid.param.tmax)
763 pm121_failure_state |= FAILURE_OVERTEMP;
764
765 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
766
767 /* correction */
768 new_setpoint = pm121_correct(new_setpoint,
769 FAN_CPU,
770 st->pid.param.min);
771
772 /* connected correction */
773 new_setpoint = pm121_connect(FAN_CPU, new_setpoint);
774
775 if (st->setpoint == new_setpoint)
776 return;
777 st->setpoint = new_setpoint;
778 pr_debug("pm121: CPU corrected setpoint: %d RPM\n", (int)new_setpoint);
779
780 readjust:
781 if (fan_cpu && pm121_failure_state == 0) {
782 rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint);
783 if (rc) {
784 printk(KERN_WARNING "pm121: %s fan error %d\n",
785 fan_cpu->name, rc);
786 pm121_failure_state |= FAILURE_FAN;
787 }
788 }
789 }
790
791 /*
792 * ****** Common ******
793 *
794 */
795
796 static void pm121_tick(void)
797 {
798 unsigned int last_failure = pm121_failure_state;
799 unsigned int new_failure;
800 s32 total_power;
801 int i;
802
803 if (!pm121_started) {
804 pr_debug("pm121: creating control loops !\n");
805 for (i = 0; i < N_LOOPS; i++)
806 pm121_create_sys_fans(i);
807
808 pm121_create_cpu_fans();
809 pm121_started = 1;
810 }
811
812 /* skipping ticks */
813 if (pm121_skipping && --pm121_skipping)
814 return;
815
816 /* compute average power */
817 total_power = 0;
818 for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++)
819 total_power += pm121_cpu_state->pid.powers[i];
820
821 average_power = total_power / pm121_cpu_state->pid.param.history_len;
822
823
824 pm121_failure_state = 0;
825 for (i = 0 ; i < N_LOOPS; i++) {
826 if (pm121_sys_state[i])
827 pm121_sys_fans_tick(i);
828 }
829
830 if (pm121_cpu_state)
831 pm121_cpu_fans_tick(pm121_cpu_state);
832
833 pm121_readjust = 0;
834 new_failure = pm121_failure_state & ~last_failure;
835
836 /* If entering failure mode, clamp cpufreq and ramp all
837 * fans to full speed.
838 */
839 if (pm121_failure_state && !last_failure) {
840 for (i = 0; i < N_CONTROLS; i++) {
841 if (controls[i])
842 wf_control_set_max(controls[i]);
843 }
844 }
845
846 /* If leaving failure mode, unclamp cpufreq and readjust
847 * all fans on next iteration
848 */
849 if (!pm121_failure_state && last_failure) {
850 if (controls[CPUFREQ])
851 wf_control_set_min(controls[CPUFREQ]);
852 pm121_readjust = 1;
853 }
854
855 /* Overtemp condition detected, notify and start skipping a couple
856 * ticks to let the temperature go down
857 */
858 if (new_failure & FAILURE_OVERTEMP) {
859 wf_set_overtemp();
860 pm121_skipping = 2;
861 pm121_overtemp = true;
862 }
863
864 /* We only clear the overtemp condition if overtemp is cleared
865 * _and_ no other failure is present. Since a sensor error will
866 * clear the overtemp condition (can't measure temperature) at
867 * the control loop levels, but we don't want to keep it clear
868 * here in this case
869 */
870 if (!pm121_failure_state && pm121_overtemp) {
871 wf_clear_overtemp();
872 pm121_overtemp = false;
873 }
874 }
875
876
877 static struct wf_control* pm121_register_control(struct wf_control *ct,
878 const char *match,
879 unsigned int id)
880 {
881 if (controls[id] == NULL && !strcmp(ct->name, match)) {
882 if (wf_get_control(ct) == 0)
883 controls[id] = ct;
884 }
885 return controls[id];
886 }
887
888 static void pm121_new_control(struct wf_control *ct)
889 {
890 int all = 1;
891
892 if (pm121_all_controls_ok)
893 return;
894
895 all = pm121_register_control(ct, "optical-drive-fan", FAN_OD) && all;
896 all = pm121_register_control(ct, "hard-drive-fan", FAN_HD) && all;
897 all = pm121_register_control(ct, "cpu-fan", FAN_CPU) && all;
898 all = pm121_register_control(ct, "cpufreq-clamp", CPUFREQ) && all;
899
900 if (all)
901 pm121_all_controls_ok = 1;
902 }
903
904
905
906
907 static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor,
908 const char *match,
909 struct wf_sensor **var)
910 {
911 if (*var == NULL && !strcmp(sensor->name, match)) {
912 if (wf_get_sensor(sensor) == 0)
913 *var = sensor;
914 }
915 return *var;
916 }
917
918 static void pm121_new_sensor(struct wf_sensor *sr)
919 {
920 int all = 1;
921
922 if (pm121_all_sensors_ok)
923 return;
924
925 all = pm121_register_sensor(sr, "cpu-temp",
926 &sensor_cpu_temp) && all;
927 all = pm121_register_sensor(sr, "cpu-current",
928 &sensor_cpu_current) && all;
929 all = pm121_register_sensor(sr, "cpu-voltage",
930 &sensor_cpu_voltage) && all;
931 all = pm121_register_sensor(sr, "cpu-power",
932 &sensor_cpu_power) && all;
933 all = pm121_register_sensor(sr, "hard-drive-temp",
934 &sensor_hard_drive_temp) && all;
935 all = pm121_register_sensor(sr, "optical-drive-temp",
936 &sensor_optical_drive_temp) && all;
937 all = pm121_register_sensor(sr, "incoming-air-temp",
938 &sensor_incoming_air_temp) && all;
939 all = pm121_register_sensor(sr, "north-bridge-temp",
940 &sensor_north_bridge_temp) && all;
941 all = pm121_register_sensor(sr, "gpu-temp",
942 &sensor_gpu_temp) && all;
943
944 if (all)
945 pm121_all_sensors_ok = 1;
946 }
947
948
949
950 static int pm121_notify(struct notifier_block *self,
951 unsigned long event, void *data)
952 {
953 switch (event) {
954 case WF_EVENT_NEW_CONTROL:
955 pr_debug("pm121: new control %s detected\n",
956 ((struct wf_control *)data)->name);
957 pm121_new_control(data);
958 break;
959 case WF_EVENT_NEW_SENSOR:
960 pr_debug("pm121: new sensor %s detected\n",
961 ((struct wf_sensor *)data)->name);
962 pm121_new_sensor(data);
963 break;
964 case WF_EVENT_TICK:
965 if (pm121_all_controls_ok && pm121_all_sensors_ok)
966 pm121_tick();
967 break;
968 }
969
970 return 0;
971 }
972
973 static struct notifier_block pm121_events = {
974 .notifier_call = pm121_notify,
975 };
976
977 static int pm121_init_pm(void)
978 {
979 const struct smu_sdbp_header *hdr;
980
981 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
982 if (hdr != 0) {
983 struct smu_sdbp_sensortree *st =
984 (struct smu_sdbp_sensortree *)&hdr[1];
985 pm121_mach_model = st->model_id;
986 }
987
988 pm121_connection = &pm121_connections[pm121_mach_model - 2];
989
990 printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n",
991 pm121_mach_model);
992
993 return 0;
994 }
995
996
997 static int pm121_probe(struct platform_device *ddev)
998 {
999 wf_register_client(&pm121_events);
1000
1001 return 0;
1002 }
1003
1004 static int pm121_remove(struct platform_device *ddev)
1005 {
1006 wf_unregister_client(&pm121_events);
1007 return 0;
1008 }
1009
1010 static struct platform_driver pm121_driver = {
1011 .probe = pm121_probe,
1012 .remove = pm121_remove,
1013 .driver = {
1014 .name = "windfarm",
1015 .bus = &platform_bus_type,
1016 },
1017 };
1018
1019
1020 static int __init pm121_init(void)
1021 {
1022 int rc = -ENODEV;
1023
1024 if (of_machine_is_compatible("PowerMac12,1"))
1025 rc = pm121_init_pm();
1026
1027 if (rc == 0) {
1028 request_module("windfarm_smu_controls");
1029 request_module("windfarm_smu_sensors");
1030 request_module("windfarm_smu_sat");
1031 request_module("windfarm_lm75_sensor");
1032 request_module("windfarm_max6690_sensor");
1033 request_module("windfarm_cpufreq_clamp");
1034 platform_driver_register(&pm121_driver);
1035 }
1036
1037 return rc;
1038 }
1039
1040 static void __exit pm121_exit(void)
1041 {
1042
1043 platform_driver_unregister(&pm121_driver);
1044 }
1045
1046
1047 module_init(pm121_init);
1048 module_exit(pm121_exit);
1049
1050 MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>");
1051 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
1052 MODULE_LICENSE("GPL");
1053
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