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Merge tag 'acpi-fixes-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / macintosh / windfarm_pm121.c
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 s32 average_power;
280
281 struct pm121_correction {
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
323 struct pm121_connection {
324 unsigned int control_id;
325 unsigned int ref_id;
326 struct pm121_correction correction;
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 */
359 struct pm121_sys_param {
360 /* purely informative since we use mach_model-2 as index */
361 int model_id;
362 struct wf_sensor **sensor; /* use sensor_id instead ? */
363 s32 gp, itarget;
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 */
439 struct pm121_sys_state {
440 int ticks;
441 s32 setpoint;
442 struct wf_pid_state pid;
443 };
444
445 struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {};
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 */
456 struct pm121_cpu_state {
457 int ticks;
458 s32 setpoint;
459 struct wf_cpu_pid_state pid;
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 }
598 st->ticks = PM121_SYS_INTERVAL;
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 */
651 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
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 */
661 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
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 }
728 st->ticks = PM121_CPU_INTERVAL;
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)
859 wf_clear_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) {
940 case WF_EVENT_NEW_CONTROL:
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
967 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
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 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 = 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 <bersace@gmail.com>");
1037 MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)");
1038 MODULE_LICENSE("GPL");
1039
kernel source for telekom puls (alcatel/mediatek)