1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Windfarm PowerMac thermal control. iMac G5 iSight |
4 | * |
5 | * (c) Copyright 2007 Étienne Bersac <bersace@gmail.com> |
6 | * |
7 | * Bits & pieces from windfarm_pm81.c by (c) Copyright 2005 Benjamin |
8 | * Herrenschmidt, IBM Corp. <benh@kernel.crashing.org> |
9 | * |
10 | * PowerMac12,1 |
11 | * ============ |
12 | * |
13 | * The algorithm used is the PID control algorithm, used the same way |
14 | * the published Darwin code does, using the same values that are |
15 | * present in the Darwin 8.10 snapshot property lists (note however |
16 | * that none of the code has been re-used, it's a complete |
17 | * re-implementation |
18 | * |
19 | * There is two models using PowerMac12,1. Model 2 is iMac G5 iSight |
20 | * 17" while Model 3 is iMac G5 20". They do have both the same |
21 | * controls with a tiny difference. The control-ids of hard-drive-fan |
22 | * and cpu-fan is swapped. |
23 | * |
24 | * Target Correction : |
25 | * |
26 | * controls have a target correction calculated as : |
27 | * |
28 | * new_min = ((((average_power * slope) >> 16) + offset) >> 16) + min_value |
29 | * new_value = max(new_value, max(new_min, 0)) |
30 | * |
31 | * OD Fan control correction. |
32 | * |
33 | * # model_id: 2 |
34 | * offset : -19563152 |
35 | * slope : 1956315 |
36 | * |
37 | * # model_id: 3 |
38 | * offset : -15650652 |
39 | * slope : 1565065 |
40 | * |
41 | * HD Fan control correction. |
42 | * |
43 | * # model_id: 2 |
44 | * offset : -15650652 |
45 | * slope : 1565065 |
46 | * |
47 | * # model_id: 3 |
48 | * offset : -19563152 |
49 | * slope : 1956315 |
50 | * |
51 | * CPU Fan control correction. |
52 | * |
53 | * # model_id: 2 |
54 | * offset : -25431900 |
55 | * slope : 2543190 |
56 | * |
57 | * # model_id: 3 |
58 | * offset : -15650652 |
59 | * slope : 1565065 |
60 | * |
61 | * Target rubber-banding : |
62 | * |
63 | * Some controls have a target correction which depends on another |
64 | * control value. The correction is computed in the following way : |
65 | * |
66 | * new_min = ref_value * slope + offset |
67 | * |
68 | * ref_value is the value of the reference control. If new_min is |
69 | * greater than 0, then we correct the target value using : |
70 | * |
71 | * new_target = max (new_target, new_min >> 16) |
72 | * |
73 | * # model_id : 2 |
74 | * control : cpu-fan |
75 | * ref : optical-drive-fan |
76 | * offset : -15650652 |
77 | * slope : 1565065 |
78 | * |
79 | * # model_id : 3 |
80 | * control : optical-drive-fan |
81 | * ref : hard-drive-fan |
82 | * offset : -32768000 |
83 | * slope : 65536 |
84 | * |
85 | * In order to have the moste efficient correction with those |
86 | * dependencies, we must trigger HD loop before OD loop before CPU |
87 | * loop. |
88 | * |
89 | * The various control loops found in Darwin config file are: |
90 | * |
91 | * HD Fan control loop. |
92 | * |
93 | * # model_id: 2 |
94 | * control : hard-drive-fan |
95 | * sensor : hard-drive-temp |
96 | * PID params : G_d = 0x00000000 |
97 | * G_p = 0x002D70A3 |
98 | * G_r = 0x00019999 |
99 | * History = 2 entries |
100 | * Input target = 0x370000 |
101 | * Interval = 5s |
102 | * |
103 | * # model_id: 3 |
104 | * control : hard-drive-fan |
105 | * sensor : hard-drive-temp |
106 | * PID params : G_d = 0x00000000 |
107 | * G_p = 0x002170A3 |
108 | * G_r = 0x00019999 |
109 | * History = 2 entries |
110 | * Input target = 0x370000 |
111 | * Interval = 5s |
112 | * |
113 | * OD Fan control loop. |
114 | * |
115 | * # model_id: 2 |
116 | * control : optical-drive-fan |
117 | * sensor : optical-drive-temp |
118 | * PID params : G_d = 0x00000000 |
119 | * G_p = 0x001FAE14 |
120 | * G_r = 0x00019999 |
121 | * History = 2 entries |
122 | * Input target = 0x320000 |
123 | * Interval = 5s |
124 | * |
125 | * # model_id: 3 |
126 | * control : optical-drive-fan |
127 | * sensor : optical-drive-temp |
128 | * PID params : G_d = 0x00000000 |
129 | * G_p = 0x001FAE14 |
130 | * G_r = 0x00019999 |
131 | * History = 2 entries |
132 | * Input target = 0x320000 |
133 | * Interval = 5s |
134 | * |
135 | * GPU Fan control loop. |
136 | * |
137 | * # model_id: 2 |
138 | * control : hard-drive-fan |
139 | * sensor : gpu-temp |
140 | * PID params : G_d = 0x00000000 |
141 | * G_p = 0x002A6666 |
142 | * G_r = 0x00019999 |
143 | * History = 2 entries |
144 | * Input target = 0x5A0000 |
145 | * Interval = 5s |
146 | * |
147 | * # model_id: 3 |
148 | * control : cpu-fan |
149 | * sensor : gpu-temp |
150 | * PID params : G_d = 0x00000000 |
151 | * G_p = 0x0010CCCC |
152 | * G_r = 0x00019999 |
153 | * History = 2 entries |
154 | * Input target = 0x500000 |
155 | * Interval = 5s |
156 | * |
157 | * KODIAK (aka northbridge) Fan control loop. |
158 | * |
159 | * # model_id: 2 |
160 | * control : optical-drive-fan |
161 | * sensor : north-bridge-temp |
162 | * PID params : G_d = 0x00000000 |
163 | * G_p = 0x003BD70A |
164 | * G_r = 0x00019999 |
165 | * History = 2 entries |
166 | * Input target = 0x550000 |
167 | * Interval = 5s |
168 | * |
169 | * # model_id: 3 |
170 | * control : hard-drive-fan |
171 | * sensor : north-bridge-temp |
172 | * PID params : G_d = 0x00000000 |
173 | * G_p = 0x0030F5C2 |
174 | * G_r = 0x00019999 |
175 | * History = 2 entries |
176 | * Input target = 0x550000 |
177 | * Interval = 5s |
178 | * |
179 | * CPU Fan control loop. |
180 | * |
181 | * control : cpu-fan |
182 | * sensors : cpu-temp, cpu-power |
183 | * PID params : from SDB partition |
184 | * |
185 | * CPU Slew control loop. |
186 | * |
187 | * control : cpufreq-clamp |
188 | * sensor : cpu-temp |
189 | */ |
190 | |
191 | #undef DEBUG |
192 | |
193 | #include <linux/types.h> |
194 | #include <linux/errno.h> |
195 | #include <linux/kernel.h> |
196 | #include <linux/delay.h> |
197 | #include <linux/slab.h> |
198 | #include <linux/init.h> |
199 | #include <linux/spinlock.h> |
200 | #include <linux/wait.h> |
201 | #include <linux/kmod.h> |
202 | #include <linux/device.h> |
203 | #include <linux/platform_device.h> |
204 | #include <linux/of.h> |
205 | |
206 | #include <asm/machdep.h> |
207 | #include <asm/io.h> |
208 | #include <asm/sections.h> |
209 | #include <asm/smu.h> |
210 | |
211 | #include "windfarm.h" |
212 | #include "windfarm_pid.h" |
213 | |
214 | #define VERSION "0.3" |
215 | |
216 | static int pm121_mach_model; /* machine model id */ |
217 | |
218 | /* Controls & sensors */ |
219 | static struct wf_sensor *sensor_cpu_power; |
220 | static struct wf_sensor *sensor_cpu_temp; |
221 | static struct wf_sensor *sensor_cpu_voltage; |
222 | static struct wf_sensor *sensor_cpu_current; |
223 | static struct wf_sensor *sensor_gpu_temp; |
224 | static struct wf_sensor *sensor_north_bridge_temp; |
225 | static struct wf_sensor *sensor_hard_drive_temp; |
226 | static struct wf_sensor *sensor_optical_drive_temp; |
227 | static struct wf_sensor *sensor_incoming_air_temp; /* unused ! */ |
228 | |
229 | enum { |
230 | FAN_CPU, |
231 | FAN_HD, |
232 | FAN_OD, |
233 | CPUFREQ, |
234 | N_CONTROLS |
235 | }; |
236 | static struct wf_control *controls[N_CONTROLS] = {}; |
237 | |
238 | /* Set to kick the control loop into life */ |
239 | static int pm121_all_controls_ok, pm121_all_sensors_ok; |
240 | static bool pm121_started; |
241 | |
242 | enum { |
243 | FAILURE_FAN = 1 << 0, |
244 | FAILURE_SENSOR = 1 << 1, |
245 | FAILURE_OVERTEMP = 1 << 2 |
246 | }; |
247 | |
248 | /* All sys loops. Note the HD before the OD loop in order to have it |
249 | run before. */ |
250 | enum { |
251 | LOOP_GPU, /* control = hd or cpu, but luckily, |
252 | it doesn't matter */ |
253 | LOOP_HD, /* control = hd */ |
254 | LOOP_KODIAK, /* control = hd or od */ |
255 | LOOP_OD, /* control = od */ |
256 | N_LOOPS |
257 | }; |
258 | |
259 | static const char *loop_names[N_LOOPS] = { |
260 | "GPU" , |
261 | "HD" , |
262 | "KODIAK" , |
263 | "OD" , |
264 | }; |
265 | |
266 | #define PM121_NUM_CONFIGS 2 |
267 | |
268 | static unsigned int pm121_failure_state; |
269 | static int pm121_readjust, pm121_skipping; |
270 | static bool pm121_overtemp; |
271 | static s32 average_power; |
272 | |
273 | struct pm121_correction { |
274 | int offset; |
275 | int slope; |
276 | }; |
277 | |
278 | static struct pm121_correction corrections[N_CONTROLS][PM121_NUM_CONFIGS] = { |
279 | /* FAN_OD */ |
280 | { |
281 | /* MODEL 2 */ |
282 | { .offset = -19563152, |
283 | .slope = 1956315 |
284 | }, |
285 | /* MODEL 3 */ |
286 | { .offset = -15650652, |
287 | .slope = 1565065 |
288 | }, |
289 | }, |
290 | /* FAN_HD */ |
291 | { |
292 | /* MODEL 2 */ |
293 | { .offset = -15650652, |
294 | .slope = 1565065 |
295 | }, |
296 | /* MODEL 3 */ |
297 | { .offset = -19563152, |
298 | .slope = 1956315 |
299 | }, |
300 | }, |
301 | /* FAN_CPU */ |
302 | { |
303 | /* MODEL 2 */ |
304 | { .offset = -25431900, |
305 | .slope = 2543190 |
306 | }, |
307 | /* MODEL 3 */ |
308 | { .offset = -15650652, |
309 | .slope = 1565065 |
310 | }, |
311 | }, |
312 | /* CPUFREQ has no correction (and is not implemented at all) */ |
313 | }; |
314 | |
315 | struct pm121_connection { |
316 | unsigned int control_id; |
317 | unsigned int ref_id; |
318 | struct pm121_correction correction; |
319 | }; |
320 | |
321 | static struct pm121_connection pm121_connections[] = { |
322 | /* MODEL 2 */ |
323 | { .control_id = FAN_CPU, |
324 | .ref_id = FAN_OD, |
325 | { .offset = -32768000, |
326 | .slope = 65536 |
327 | } |
328 | }, |
329 | /* MODEL 3 */ |
330 | { .control_id = FAN_OD, |
331 | .ref_id = FAN_HD, |
332 | { .offset = -32768000, |
333 | .slope = 65536 |
334 | } |
335 | }, |
336 | }; |
337 | |
338 | /* pointer to the current model connection */ |
339 | static struct pm121_connection *pm121_connection; |
340 | |
341 | /* |
342 | * ****** System Fans Control Loop ****** |
343 | * |
344 | */ |
345 | |
346 | /* Since each loop handles only one control and we want to avoid |
347 | * writing virtual control, we store the control correction with the |
348 | * loop params. Some data are not set, there are common to all loop |
349 | * and thus, hardcoded. |
350 | */ |
351 | struct pm121_sys_param { |
352 | /* purely informative since we use mach_model-2 as index */ |
353 | int model_id; |
354 | struct wf_sensor **sensor; /* use sensor_id instead ? */ |
355 | s32 gp, itarget; |
356 | unsigned int control_id; |
357 | }; |
358 | |
359 | static struct pm121_sys_param |
360 | pm121_sys_all_params[N_LOOPS][PM121_NUM_CONFIGS] = { |
361 | /* GPU Fan control loop */ |
362 | { |
363 | { .model_id = 2, |
364 | .sensor = &sensor_gpu_temp, |
365 | .gp = 0x002A6666, |
366 | .itarget = 0x5A0000, |
367 | .control_id = FAN_HD, |
368 | }, |
369 | { .model_id = 3, |
370 | .sensor = &sensor_gpu_temp, |
371 | .gp = 0x0010CCCC, |
372 | .itarget = 0x500000, |
373 | .control_id = FAN_CPU, |
374 | }, |
375 | }, |
376 | /* HD Fan control loop */ |
377 | { |
378 | { .model_id = 2, |
379 | .sensor = &sensor_hard_drive_temp, |
380 | .gp = 0x002D70A3, |
381 | .itarget = 0x370000, |
382 | .control_id = FAN_HD, |
383 | }, |
384 | { .model_id = 3, |
385 | .sensor = &sensor_hard_drive_temp, |
386 | .gp = 0x002170A3, |
387 | .itarget = 0x370000, |
388 | .control_id = FAN_HD, |
389 | }, |
390 | }, |
391 | /* KODIAK Fan control loop */ |
392 | { |
393 | { .model_id = 2, |
394 | .sensor = &sensor_north_bridge_temp, |
395 | .gp = 0x003BD70A, |
396 | .itarget = 0x550000, |
397 | .control_id = FAN_OD, |
398 | }, |
399 | { .model_id = 3, |
400 | .sensor = &sensor_north_bridge_temp, |
401 | .gp = 0x0030F5C2, |
402 | .itarget = 0x550000, |
403 | .control_id = FAN_HD, |
404 | }, |
405 | }, |
406 | /* OD Fan control loop */ |
407 | { |
408 | { .model_id = 2, |
409 | .sensor = &sensor_optical_drive_temp, |
410 | .gp = 0x001FAE14, |
411 | .itarget = 0x320000, |
412 | .control_id = FAN_OD, |
413 | }, |
414 | { .model_id = 3, |
415 | .sensor = &sensor_optical_drive_temp, |
416 | .gp = 0x001FAE14, |
417 | .itarget = 0x320000, |
418 | .control_id = FAN_OD, |
419 | }, |
420 | }, |
421 | }; |
422 | |
423 | /* the hardcoded values */ |
424 | #define PM121_SYS_GD 0x00000000 |
425 | #define PM121_SYS_GR 0x00019999 |
426 | #define PM121_SYS_HISTORY_SIZE 2 |
427 | #define PM121_SYS_INTERVAL 5 |
428 | |
429 | /* State data used by the system fans control loop |
430 | */ |
431 | struct pm121_sys_state { |
432 | int ticks; |
433 | s32 setpoint; |
434 | struct wf_pid_state pid; |
435 | }; |
436 | |
437 | static struct pm121_sys_state *pm121_sys_state[N_LOOPS] = {}; |
438 | |
439 | /* |
440 | * ****** CPU Fans Control Loop ****** |
441 | * |
442 | */ |
443 | |
444 | #define PM121_CPU_INTERVAL 1 |
445 | |
446 | /* State data used by the cpu fans control loop |
447 | */ |
448 | struct pm121_cpu_state { |
449 | int ticks; |
450 | s32 setpoint; |
451 | struct wf_cpu_pid_state pid; |
452 | }; |
453 | |
454 | static struct pm121_cpu_state *pm121_cpu_state; |
455 | |
456 | |
457 | |
458 | /* |
459 | * ***** Implementation ***** |
460 | * |
461 | */ |
462 | |
463 | /* correction the value using the output-low-bound correction algo */ |
464 | static s32 pm121_correct(s32 new_setpoint, |
465 | unsigned int control_id, |
466 | s32 min) |
467 | { |
468 | s32 new_min; |
469 | struct pm121_correction *correction; |
470 | correction = &corrections[control_id][pm121_mach_model - 2]; |
471 | |
472 | new_min = (average_power * correction->slope) >> 16; |
473 | new_min += correction->offset; |
474 | new_min = (new_min >> 16) + min; |
475 | |
476 | return max3(new_setpoint, new_min, 0); |
477 | } |
478 | |
479 | static s32 pm121_connect(unsigned int control_id, s32 setpoint) |
480 | { |
481 | s32 new_min, value, new_setpoint; |
482 | |
483 | if (pm121_connection->control_id == control_id) { |
484 | controls[control_id]->ops->get_value(controls[control_id], |
485 | &value); |
486 | new_min = value * pm121_connection->correction.slope; |
487 | new_min += pm121_connection->correction.offset; |
488 | if (new_min > 0) { |
489 | new_setpoint = max(setpoint, (new_min >> 16)); |
490 | if (new_setpoint != setpoint) { |
491 | pr_debug("pm121: %s depending on %s, " |
492 | "corrected from %d to %d RPM\n" , |
493 | controls[control_id]->name, |
494 | controls[pm121_connection->ref_id]->name, |
495 | (int) setpoint, (int) new_setpoint); |
496 | } |
497 | } else |
498 | new_setpoint = setpoint; |
499 | } |
500 | /* no connection */ |
501 | else |
502 | new_setpoint = setpoint; |
503 | |
504 | return new_setpoint; |
505 | } |
506 | |
507 | /* FAN LOOPS */ |
508 | static void pm121_create_sys_fans(int loop_id) |
509 | { |
510 | struct pm121_sys_param *param = NULL; |
511 | struct wf_pid_param pid_param; |
512 | struct wf_control *control = NULL; |
513 | int i; |
514 | |
515 | /* First, locate the params for this model */ |
516 | for (i = 0; i < PM121_NUM_CONFIGS; i++) { |
517 | if (pm121_sys_all_params[loop_id][i].model_id == pm121_mach_model) { |
518 | param = &(pm121_sys_all_params[loop_id][i]); |
519 | break; |
520 | } |
521 | } |
522 | |
523 | /* No params found, put fans to max */ |
524 | if (param == NULL) { |
525 | printk(KERN_WARNING "pm121: %s fan config not found " |
526 | " for this machine model\n" , |
527 | loop_names[loop_id]); |
528 | goto fail; |
529 | } |
530 | |
531 | control = controls[param->control_id]; |
532 | |
533 | /* Alloc & initialize state */ |
534 | pm121_sys_state[loop_id] = kmalloc(size: sizeof(struct pm121_sys_state), |
535 | GFP_KERNEL); |
536 | if (pm121_sys_state[loop_id] == NULL) { |
537 | printk(KERN_WARNING "pm121: Memory allocation error\n" ); |
538 | goto fail; |
539 | } |
540 | pm121_sys_state[loop_id]->ticks = 1; |
541 | |
542 | /* Fill PID params */ |
543 | pid_param.gd = PM121_SYS_GD; |
544 | pid_param.gp = param->gp; |
545 | pid_param.gr = PM121_SYS_GR; |
546 | pid_param.interval = PM121_SYS_INTERVAL; |
547 | pid_param.history_len = PM121_SYS_HISTORY_SIZE; |
548 | pid_param.itarget = param->itarget; |
549 | if(control) |
550 | { |
551 | pid_param.min = control->ops->get_min(control); |
552 | pid_param.max = control->ops->get_max(control); |
553 | } else { |
554 | /* |
555 | * This is probably not the right!? |
556 | * Perhaps goto fail if control == NULL above? |
557 | */ |
558 | pid_param.min = 0; |
559 | pid_param.max = 0; |
560 | } |
561 | |
562 | wf_pid_init(st: &pm121_sys_state[loop_id]->pid, param: &pid_param); |
563 | |
564 | pr_debug("pm121: %s Fan control loop initialized.\n" |
565 | " itarged=%d.%03d, min=%d RPM, max=%d RPM\n" , |
566 | loop_names[loop_id], FIX32TOPRINT(pid_param.itarget), |
567 | pid_param.min, pid_param.max); |
568 | return; |
569 | |
570 | fail: |
571 | /* note that this is not optimal since another loop may still |
572 | control the same control */ |
573 | printk(KERN_WARNING "pm121: failed to set up %s loop " |
574 | "setting \"%s\" to max speed.\n" , |
575 | loop_names[loop_id], control ? control->name : "uninitialized value" ); |
576 | |
577 | if (control) |
578 | wf_control_set_max(ct: control); |
579 | } |
580 | |
581 | static void pm121_sys_fans_tick(int loop_id) |
582 | { |
583 | struct pm121_sys_param *param; |
584 | struct pm121_sys_state *st; |
585 | struct wf_sensor *sensor; |
586 | struct wf_control *control; |
587 | s32 temp, new_setpoint; |
588 | int rc; |
589 | |
590 | param = &(pm121_sys_all_params[loop_id][pm121_mach_model-2]); |
591 | st = pm121_sys_state[loop_id]; |
592 | sensor = *(param->sensor); |
593 | control = controls[param->control_id]; |
594 | |
595 | if (--st->ticks != 0) { |
596 | if (pm121_readjust) |
597 | goto readjust; |
598 | return; |
599 | } |
600 | st->ticks = PM121_SYS_INTERVAL; |
601 | |
602 | rc = sensor->ops->get_value(sensor, &temp); |
603 | if (rc) { |
604 | printk(KERN_WARNING "windfarm: %s sensor error %d\n" , |
605 | sensor->name, rc); |
606 | pm121_failure_state |= FAILURE_SENSOR; |
607 | return; |
608 | } |
609 | |
610 | pr_debug("pm121: %s Fan tick ! %s: %d.%03d\n" , |
611 | loop_names[loop_id], sensor->name, |
612 | FIX32TOPRINT(temp)); |
613 | |
614 | new_setpoint = wf_pid_run(st: &st->pid, sample: temp); |
615 | |
616 | /* correction */ |
617 | new_setpoint = pm121_correct(new_setpoint, |
618 | control_id: param->control_id, |
619 | min: st->pid.param.min); |
620 | /* linked corretion */ |
621 | new_setpoint = pm121_connect(control_id: param->control_id, setpoint: new_setpoint); |
622 | |
623 | if (new_setpoint == st->setpoint) |
624 | return; |
625 | st->setpoint = new_setpoint; |
626 | pr_debug("pm121: %s corrected setpoint: %d RPM\n" , |
627 | control->name, (int)new_setpoint); |
628 | readjust: |
629 | if (control && pm121_failure_state == 0) { |
630 | rc = control->ops->set_value(control, st->setpoint); |
631 | if (rc) { |
632 | printk(KERN_WARNING "windfarm: %s fan error %d\n" , |
633 | control->name, rc); |
634 | pm121_failure_state |= FAILURE_FAN; |
635 | } |
636 | } |
637 | } |
638 | |
639 | |
640 | /* CPU LOOP */ |
641 | static void pm121_create_cpu_fans(void) |
642 | { |
643 | struct wf_cpu_pid_param pid_param; |
644 | const struct *hdr; |
645 | struct smu_sdbp_cpupiddata *piddata; |
646 | struct smu_sdbp_fvt *fvt; |
647 | struct wf_control *fan_cpu; |
648 | s32 tmax, tdelta, maxpow, powadj; |
649 | |
650 | fan_cpu = controls[FAN_CPU]; |
651 | |
652 | /* First, locate the PID params in SMU SBD */ |
653 | hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); |
654 | if (!hdr) { |
655 | printk(KERN_WARNING "pm121: CPU PID fan config not found.\n" ); |
656 | goto fail; |
657 | } |
658 | piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; |
659 | |
660 | /* Get the FVT params for operating point 0 (the only supported one |
661 | * for now) in order to get tmax |
662 | */ |
663 | hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); |
664 | if (hdr) { |
665 | fvt = (struct smu_sdbp_fvt *)&hdr[1]; |
666 | tmax = ((s32)fvt->maxtemp) << 16; |
667 | } else |
668 | tmax = 0x5e0000; /* 94 degree default */ |
669 | |
670 | /* Alloc & initialize state */ |
671 | pm121_cpu_state = kmalloc(size: sizeof(struct pm121_cpu_state), |
672 | GFP_KERNEL); |
673 | if (pm121_cpu_state == NULL) |
674 | goto fail; |
675 | pm121_cpu_state->ticks = 1; |
676 | |
677 | /* Fill PID params */ |
678 | pid_param.interval = PM121_CPU_INTERVAL; |
679 | pid_param.history_len = piddata->history_len; |
680 | if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { |
681 | printk(KERN_WARNING "pm121: History size overflow on " |
682 | "CPU control loop (%d)\n" , piddata->history_len); |
683 | pid_param.history_len = WF_CPU_PID_MAX_HISTORY; |
684 | } |
685 | pid_param.gd = piddata->gd; |
686 | pid_param.gp = piddata->gp; |
687 | pid_param.gr = piddata->gr / pid_param.history_len; |
688 | |
689 | tdelta = ((s32)piddata->target_temp_delta) << 16; |
690 | maxpow = ((s32)piddata->max_power) << 16; |
691 | powadj = ((s32)piddata->power_adj) << 16; |
692 | |
693 | pid_param.tmax = tmax; |
694 | pid_param.ttarget = tmax - tdelta; |
695 | pid_param.pmaxadj = maxpow - powadj; |
696 | |
697 | pid_param.min = fan_cpu->ops->get_min(fan_cpu); |
698 | pid_param.max = fan_cpu->ops->get_max(fan_cpu); |
699 | |
700 | wf_cpu_pid_init(st: &pm121_cpu_state->pid, param: &pid_param); |
701 | |
702 | pr_debug("pm121: CPU Fan control initialized.\n" ); |
703 | pr_debug(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM,\n" , |
704 | FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), |
705 | pid_param.min, pid_param.max); |
706 | |
707 | return; |
708 | |
709 | fail: |
710 | printk(KERN_WARNING "pm121: CPU fan config not found, max fan speed\n" ); |
711 | |
712 | if (controls[CPUFREQ]) |
713 | wf_control_set_max(ct: controls[CPUFREQ]); |
714 | if (fan_cpu) |
715 | wf_control_set_max(ct: fan_cpu); |
716 | } |
717 | |
718 | |
719 | static void pm121_cpu_fans_tick(struct pm121_cpu_state *st) |
720 | { |
721 | s32 new_setpoint, temp, power; |
722 | struct wf_control *fan_cpu = NULL; |
723 | int rc; |
724 | |
725 | if (--st->ticks != 0) { |
726 | if (pm121_readjust) |
727 | goto readjust; |
728 | return; |
729 | } |
730 | st->ticks = PM121_CPU_INTERVAL; |
731 | |
732 | fan_cpu = controls[FAN_CPU]; |
733 | |
734 | rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); |
735 | if (rc) { |
736 | printk(KERN_WARNING "pm121: CPU temp sensor error %d\n" , |
737 | rc); |
738 | pm121_failure_state |= FAILURE_SENSOR; |
739 | return; |
740 | } |
741 | |
742 | rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); |
743 | if (rc) { |
744 | printk(KERN_WARNING "pm121: CPU power sensor error %d\n" , |
745 | rc); |
746 | pm121_failure_state |= FAILURE_SENSOR; |
747 | return; |
748 | } |
749 | |
750 | pr_debug("pm121: CPU Fans tick ! CPU temp: %d.%03d°C, power: %d.%03d\n" , |
751 | FIX32TOPRINT(temp), FIX32TOPRINT(power)); |
752 | |
753 | if (temp > st->pid.param.tmax) |
754 | pm121_failure_state |= FAILURE_OVERTEMP; |
755 | |
756 | new_setpoint = wf_cpu_pid_run(st: &st->pid, power, temp); |
757 | |
758 | /* correction */ |
759 | new_setpoint = pm121_correct(new_setpoint, |
760 | control_id: FAN_CPU, |
761 | min: st->pid.param.min); |
762 | |
763 | /* connected correction */ |
764 | new_setpoint = pm121_connect(control_id: FAN_CPU, setpoint: new_setpoint); |
765 | |
766 | if (st->setpoint == new_setpoint) |
767 | return; |
768 | st->setpoint = new_setpoint; |
769 | pr_debug("pm121: CPU corrected setpoint: %d RPM\n" , (int)new_setpoint); |
770 | |
771 | readjust: |
772 | if (fan_cpu && pm121_failure_state == 0) { |
773 | rc = fan_cpu->ops->set_value(fan_cpu, st->setpoint); |
774 | if (rc) { |
775 | printk(KERN_WARNING "pm121: %s fan error %d\n" , |
776 | fan_cpu->name, rc); |
777 | pm121_failure_state |= FAILURE_FAN; |
778 | } |
779 | } |
780 | } |
781 | |
782 | /* |
783 | * ****** Common ****** |
784 | * |
785 | */ |
786 | |
787 | static void pm121_tick(void) |
788 | { |
789 | unsigned int last_failure = pm121_failure_state; |
790 | unsigned int new_failure; |
791 | s32 total_power; |
792 | int i; |
793 | |
794 | if (!pm121_started) { |
795 | pr_debug("pm121: creating control loops !\n" ); |
796 | for (i = 0; i < N_LOOPS; i++) |
797 | pm121_create_sys_fans(loop_id: i); |
798 | |
799 | pm121_create_cpu_fans(); |
800 | pm121_started = true; |
801 | } |
802 | |
803 | /* skipping ticks */ |
804 | if (pm121_skipping && --pm121_skipping) |
805 | return; |
806 | |
807 | /* compute average power */ |
808 | total_power = 0; |
809 | for (i = 0; i < pm121_cpu_state->pid.param.history_len; i++) |
810 | total_power += pm121_cpu_state->pid.powers[i]; |
811 | |
812 | average_power = total_power / pm121_cpu_state->pid.param.history_len; |
813 | |
814 | |
815 | pm121_failure_state = 0; |
816 | for (i = 0 ; i < N_LOOPS; i++) { |
817 | if (pm121_sys_state[i]) |
818 | pm121_sys_fans_tick(loop_id: i); |
819 | } |
820 | |
821 | if (pm121_cpu_state) |
822 | pm121_cpu_fans_tick(st: pm121_cpu_state); |
823 | |
824 | pm121_readjust = 0; |
825 | new_failure = pm121_failure_state & ~last_failure; |
826 | |
827 | /* If entering failure mode, clamp cpufreq and ramp all |
828 | * fans to full speed. |
829 | */ |
830 | if (pm121_failure_state && !last_failure) { |
831 | for (i = 0; i < N_CONTROLS; i++) { |
832 | if (controls[i]) |
833 | wf_control_set_max(ct: controls[i]); |
834 | } |
835 | } |
836 | |
837 | /* If leaving failure mode, unclamp cpufreq and readjust |
838 | * all fans on next iteration |
839 | */ |
840 | if (!pm121_failure_state && last_failure) { |
841 | if (controls[CPUFREQ]) |
842 | wf_control_set_min(ct: controls[CPUFREQ]); |
843 | pm121_readjust = 1; |
844 | } |
845 | |
846 | /* Overtemp condition detected, notify and start skipping a couple |
847 | * ticks to let the temperature go down |
848 | */ |
849 | if (new_failure & FAILURE_OVERTEMP) { |
850 | wf_set_overtemp(); |
851 | pm121_skipping = 2; |
852 | pm121_overtemp = true; |
853 | } |
854 | |
855 | /* We only clear the overtemp condition if overtemp is cleared |
856 | * _and_ no other failure is present. Since a sensor error will |
857 | * clear the overtemp condition (can't measure temperature) at |
858 | * the control loop levels, but we don't want to keep it clear |
859 | * here in this case |
860 | */ |
861 | if (!pm121_failure_state && pm121_overtemp) { |
862 | wf_clear_overtemp(); |
863 | pm121_overtemp = false; |
864 | } |
865 | } |
866 | |
867 | |
868 | static struct wf_control* pm121_register_control(struct wf_control *ct, |
869 | const char *match, |
870 | unsigned int id) |
871 | { |
872 | if (controls[id] == NULL && !strcmp(ct->name, match)) { |
873 | if (wf_get_control(ct) == 0) |
874 | controls[id] = ct; |
875 | } |
876 | return controls[id]; |
877 | } |
878 | |
879 | static void pm121_new_control(struct wf_control *ct) |
880 | { |
881 | int all = 1; |
882 | |
883 | if (pm121_all_controls_ok) |
884 | return; |
885 | |
886 | all = pm121_register_control(ct, match: "optical-drive-fan" , id: FAN_OD) && all; |
887 | all = pm121_register_control(ct, match: "hard-drive-fan" , id: FAN_HD) && all; |
888 | all = pm121_register_control(ct, match: "cpu-fan" , id: FAN_CPU) && all; |
889 | all = pm121_register_control(ct, match: "cpufreq-clamp" , id: CPUFREQ) && all; |
890 | |
891 | if (all) |
892 | pm121_all_controls_ok = 1; |
893 | } |
894 | |
895 | |
896 | |
897 | |
898 | static struct wf_sensor* pm121_register_sensor(struct wf_sensor *sensor, |
899 | const char *match, |
900 | struct wf_sensor **var) |
901 | { |
902 | if (*var == NULL && !strcmp(sensor->name, match)) { |
903 | if (wf_get_sensor(sr: sensor) == 0) |
904 | *var = sensor; |
905 | } |
906 | return *var; |
907 | } |
908 | |
909 | static void pm121_new_sensor(struct wf_sensor *sr) |
910 | { |
911 | int all = 1; |
912 | |
913 | if (pm121_all_sensors_ok) |
914 | return; |
915 | |
916 | all = pm121_register_sensor(sensor: sr, match: "cpu-temp" , |
917 | var: &sensor_cpu_temp) && all; |
918 | all = pm121_register_sensor(sensor: sr, match: "cpu-current" , |
919 | var: &sensor_cpu_current) && all; |
920 | all = pm121_register_sensor(sensor: sr, match: "cpu-voltage" , |
921 | var: &sensor_cpu_voltage) && all; |
922 | all = pm121_register_sensor(sensor: sr, match: "cpu-power" , |
923 | var: &sensor_cpu_power) && all; |
924 | all = pm121_register_sensor(sensor: sr, match: "hard-drive-temp" , |
925 | var: &sensor_hard_drive_temp) && all; |
926 | all = pm121_register_sensor(sensor: sr, match: "optical-drive-temp" , |
927 | var: &sensor_optical_drive_temp) && all; |
928 | all = pm121_register_sensor(sensor: sr, match: "incoming-air-temp" , |
929 | var: &sensor_incoming_air_temp) && all; |
930 | all = pm121_register_sensor(sensor: sr, match: "north-bridge-temp" , |
931 | var: &sensor_north_bridge_temp) && all; |
932 | all = pm121_register_sensor(sensor: sr, match: "gpu-temp" , |
933 | var: &sensor_gpu_temp) && all; |
934 | |
935 | if (all) |
936 | pm121_all_sensors_ok = 1; |
937 | } |
938 | |
939 | |
940 | |
941 | static int pm121_notify(struct notifier_block *self, |
942 | unsigned long event, void *data) |
943 | { |
944 | switch (event) { |
945 | case WF_EVENT_NEW_CONTROL: |
946 | pr_debug("pm121: new control %s detected\n" , |
947 | ((struct wf_control *)data)->name); |
948 | pm121_new_control(ct: data); |
949 | break; |
950 | case WF_EVENT_NEW_SENSOR: |
951 | pr_debug("pm121: new sensor %s detected\n" , |
952 | ((struct wf_sensor *)data)->name); |
953 | pm121_new_sensor(sr: data); |
954 | break; |
955 | case WF_EVENT_TICK: |
956 | if (pm121_all_controls_ok && pm121_all_sensors_ok) |
957 | pm121_tick(); |
958 | break; |
959 | } |
960 | |
961 | return 0; |
962 | } |
963 | |
964 | static struct notifier_block pm121_events = { |
965 | .notifier_call = pm121_notify, |
966 | }; |
967 | |
968 | static int pm121_init_pm(void) |
969 | { |
970 | const struct *hdr; |
971 | |
972 | hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); |
973 | if (hdr) { |
974 | struct smu_sdbp_sensortree *st = |
975 | (struct smu_sdbp_sensortree *)&hdr[1]; |
976 | pm121_mach_model = st->model_id; |
977 | } |
978 | |
979 | pm121_connection = &pm121_connections[pm121_mach_model - 2]; |
980 | |
981 | printk(KERN_INFO "pm121: Initializing for iMac G5 iSight model ID %d\n" , |
982 | pm121_mach_model); |
983 | |
984 | return 0; |
985 | } |
986 | |
987 | |
988 | static int pm121_probe(struct platform_device *ddev) |
989 | { |
990 | wf_register_client(nb: &pm121_events); |
991 | |
992 | return 0; |
993 | } |
994 | |
995 | static void pm121_remove(struct platform_device *ddev) |
996 | { |
997 | wf_unregister_client(nb: &pm121_events); |
998 | } |
999 | |
1000 | static struct platform_driver pm121_driver = { |
1001 | .probe = pm121_probe, |
1002 | .remove_new = pm121_remove, |
1003 | .driver = { |
1004 | .name = "windfarm" , |
1005 | .bus = &platform_bus_type, |
1006 | }, |
1007 | }; |
1008 | |
1009 | |
1010 | static int __init pm121_init(void) |
1011 | { |
1012 | int rc = -ENODEV; |
1013 | |
1014 | if (of_machine_is_compatible(compat: "PowerMac12,1" )) |
1015 | rc = pm121_init_pm(); |
1016 | |
1017 | if (rc == 0) { |
1018 | request_module("windfarm_smu_controls" ); |
1019 | request_module("windfarm_smu_sensors" ); |
1020 | request_module("windfarm_smu_sat" ); |
1021 | request_module("windfarm_lm75_sensor" ); |
1022 | request_module("windfarm_max6690_sensor" ); |
1023 | request_module("windfarm_cpufreq_clamp" ); |
1024 | platform_driver_register(&pm121_driver); |
1025 | } |
1026 | |
1027 | return rc; |
1028 | } |
1029 | |
1030 | static void __exit pm121_exit(void) |
1031 | { |
1032 | |
1033 | platform_driver_unregister(&pm121_driver); |
1034 | } |
1035 | |
1036 | |
1037 | module_init(pm121_init); |
1038 | module_exit(pm121_exit); |
1039 | |
1040 | MODULE_AUTHOR("Étienne Bersac <bersace@gmail.com>" ); |
1041 | MODULE_DESCRIPTION("Thermal control logic for iMac G5 (iSight)" ); |
1042 | MODULE_LICENSE("GPL" ); |
1043 | |
1044 | |