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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Windfarm PowerMac thermal control. iMac G5
4 *
5 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
6 * <benh@kernel.crashing.org>
7 *
8 * The algorithm used is the PID control algorithm, used the same
9 * way the published Darwin code does, using the same values that
10 * are present in the Darwin 8.2 snapshot property lists (note however
11 * that none of the code has been re-used, it's a complete re-implementation
12 *
13 * The various control loops found in Darwin config file are:
14 *
15 * PowerMac8,1 and PowerMac8,2
16 * ===========================
17 *
18 * System Fans control loop. Different based on models. In addition to the
19 * usual PID algorithm, the control loop gets 2 additional pairs of linear
20 * scaling factors (scale/offsets) expressed as 4.12 fixed point values
21 * signed offset, unsigned scale)
22 *
23 * The targets are modified such as:
24 * - the linked control (second control) gets the target value as-is
25 * (typically the drive fan)
26 * - the main control (first control) gets the target value scaled with
27 * the first pair of factors, and is then modified as below
28 * - the value of the target of the CPU Fan control loop is retrieved,
29 * scaled with the second pair of factors, and the max of that and
30 * the scaled target is applied to the main control.
31 *
32 * # model_id: 2
33 * controls : system-fan, drive-bay-fan
34 * sensors : hd-temp
35 * PID params : G_d = 0x15400000
36 * G_p = 0x00200000
37 * G_r = 0x000002fd
38 * History = 2 entries
39 * Input target = 0x3a0000
40 * Interval = 5s
41 * linear-factors : offset = 0xff38 scale = 0x0ccd
42 * offset = 0x0208 scale = 0x07ae
43 *
44 * # model_id: 3
45 * controls : system-fan, drive-bay-fan
46 * sensors : hd-temp
47 * PID params : G_d = 0x08e00000
48 * G_p = 0x00566666
49 * G_r = 0x0000072b
50 * History = 2 entries
51 * Input target = 0x350000
52 * Interval = 5s
53 * linear-factors : offset = 0xff38 scale = 0x0ccd
54 * offset = 0x0000 scale = 0x0000
55 *
56 * # model_id: 5
57 * controls : system-fan
58 * sensors : hd-temp
59 * PID params : G_d = 0x15400000
60 * G_p = 0x00233333
61 * G_r = 0x000002fd
62 * History = 2 entries
63 * Input target = 0x3a0000
64 * Interval = 5s
65 * linear-factors : offset = 0x0000 scale = 0x1000
66 * offset = 0x0091 scale = 0x0bae
67 *
68 * CPU Fan control loop. The loop is identical for all models. it
69 * has an additional pair of scaling factor. This is used to scale the
70 * systems fan control loop target result (the one before it gets scaled
71 * by the System Fans control loop itself). Then, the max value of the
72 * calculated target value and system fan value is sent to the fans
73 *
74 * controls : cpu-fan
75 * sensors : cpu-temp cpu-power
76 * PID params : From SMU sdb partition
77 * linear-factors : offset = 0xfb50 scale = 0x1000
78 *
79 * CPU Slew control loop. Not implemented. The cpufreq driver in linux is
80 * completely separate for now, though we could find a way to link it, either
81 * as a client reacting to overtemp notifications, or directling monitoring
82 * the CPU temperature
83 *
84 * WARNING ! The CPU control loop requires the CPU tmax for the current
85 * operating point. However, we currently are completely separated from
86 * the cpufreq driver and thus do not know what the current operating
87 * point is. Fortunately, we also do not have any hardware supporting anything
88 * but operating point 0 at the moment, thus we just peek that value directly
89 * from the SDB partition. If we ever end up with actually slewing the system
90 * clock and thus changing operating points, we'll have to find a way to
91 * communicate with the CPU freq driver;
92 */
93
94#include <linux/types.h>
95#include <linux/errno.h>
96#include <linux/kernel.h>
97#include <linux/delay.h>
98#include <linux/slab.h>
99#include <linux/init.h>
100#include <linux/spinlock.h>
101#include <linux/wait.h>
102#include <linux/kmod.h>
103#include <linux/device.h>
104#include <linux/platform_device.h>
105#include <asm/prom.h>
106#include <asm/machdep.h>
107#include <asm/io.h>
108#include <asm/sections.h>
109#include <asm/smu.h>
110
111#include "windfarm.h"
112#include "windfarm_pid.h"
113
114#define VERSION "0.4"
115
116#undef DEBUG
117
118#ifdef DEBUG
119#define DBG(args...) printk(args)
120#else
121#define DBG(args...) do { } while(0)
122#endif
123
124/* define this to force CPU overtemp to 74 degree, useful for testing
125 * the overtemp code
126 */
127#undef HACKED_OVERTEMP
128
129static int wf_smu_mach_model; /* machine model id */
130
131/* Controls & sensors */
132static struct wf_sensor *sensor_cpu_power;
133static struct wf_sensor *sensor_cpu_temp;
134static struct wf_sensor *sensor_hd_temp;
135static struct wf_control *fan_cpu_main;
136static struct wf_control *fan_hd;
137static struct wf_control *fan_system;
138static struct wf_control *cpufreq_clamp;
139
140/* Set to kick the control loop into life */
141static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok;
142static bool wf_smu_started;
143
144/* Failure handling.. could be nicer */
145#define FAILURE_FAN 0x01
146#define FAILURE_SENSOR 0x02
147#define FAILURE_OVERTEMP 0x04
148
149static unsigned int wf_smu_failure_state;
150static int wf_smu_readjust, wf_smu_skipping;
151static bool wf_smu_overtemp;
152
153/*
154 * ****** System Fans Control Loop ******
155 *
156 */
157
158/* Parameters for the System Fans control loop. Parameters
159 * not in this table such as interval, history size, ...
160 * are common to all versions and thus hard coded for now.
161 */
162struct wf_smu_sys_fans_param {
163 int model_id;
164 s32 itarget;
165 s32 gd, gp, gr;
166
167 s16 offset0;
168 u16 scale0;
169 s16 offset1;
170 u16 scale1;
171};
172
173#define WF_SMU_SYS_FANS_INTERVAL 5
174#define WF_SMU_SYS_FANS_HISTORY_SIZE 2
175
176/* State data used by the system fans control loop
177 */
178struct wf_smu_sys_fans_state {
179 int ticks;
180 s32 sys_setpoint;
181 s32 hd_setpoint;
182 s16 offset0;
183 u16 scale0;
184 s16 offset1;
185 u16 scale1;
186 struct wf_pid_state pid;
187};
188
189/*
190 * Configs for SMU System Fan control loop
191 */
192static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
193 /* Model ID 2 */
194 {
195 .model_id = 2,
196 .itarget = 0x3a0000,
197 .gd = 0x15400000,
198 .gp = 0x00200000,
199 .gr = 0x000002fd,
200 .offset0 = 0xff38,
201 .scale0 = 0x0ccd,
202 .offset1 = 0x0208,
203 .scale1 = 0x07ae,
204 },
205 /* Model ID 3 */
206 {
207 .model_id = 3,
208 .itarget = 0x350000,
209 .gd = 0x08e00000,
210 .gp = 0x00566666,
211 .gr = 0x0000072b,
212 .offset0 = 0xff38,
213 .scale0 = 0x0ccd,
214 .offset1 = 0x0000,
215 .scale1 = 0x0000,
216 },
217 /* Model ID 5 */
218 {
219 .model_id = 5,
220 .itarget = 0x3a0000,
221 .gd = 0x15400000,
222 .gp = 0x00233333,
223 .gr = 0x000002fd,
224 .offset0 = 0x0000,
225 .scale0 = 0x1000,
226 .offset1 = 0x0091,
227 .scale1 = 0x0bae,
228 },
229};
230#define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
231
232static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
233
234/*
235 * ****** CPU Fans Control Loop ******
236 *
237 */
238
239
240#define WF_SMU_CPU_FANS_INTERVAL 1
241#define WF_SMU_CPU_FANS_MAX_HISTORY 16
242#define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000
243#define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50
244
245/* State data used by the cpu fans control loop
246 */
247struct wf_smu_cpu_fans_state {
248 int ticks;
249 s32 cpu_setpoint;
250 s32 scale;
251 s32 offset;
252 struct wf_cpu_pid_state pid;
253};
254
255static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
256
257
258
259/*
260 * ***** Implementation *****
261 *
262 */
263
264static void wf_smu_create_sys_fans(void)
265{
266 struct wf_smu_sys_fans_param *param = NULL;
267 struct wf_pid_param pid_param;
268 int i;
269
270 /* First, locate the params for this model */
271 for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
272 if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
273 param = &wf_smu_sys_all_params[i];
274 break;
275 }
276
277 /* No params found, put fans to max */
278 if (param == NULL) {
279 printk(KERN_WARNING "windfarm: System fan config not found "
280 "for this machine model, max fan speed\n");
281 goto fail;
282 }
283
284 /* Alloc & initialize state */
285 wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
286 GFP_KERNEL);
287 if (wf_smu_sys_fans == NULL) {
288 printk(KERN_WARNING "windfarm: Memory allocation error"
289 " max fan speed\n");
290 goto fail;
291 }
292 wf_smu_sys_fans->ticks = 1;
293 wf_smu_sys_fans->scale0 = param->scale0;
294 wf_smu_sys_fans->offset0 = param->offset0;
295 wf_smu_sys_fans->scale1 = param->scale1;
296 wf_smu_sys_fans->offset1 = param->offset1;
297
298 /* Fill PID params */
299 pid_param.gd = param->gd;
300 pid_param.gp = param->gp;
301 pid_param.gr = param->gr;
302 pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
303 pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
304 pid_param.itarget = param->itarget;
305 pid_param.min = wf_control_get_min(fan_system);
306 pid_param.max = wf_control_get_max(fan_system);
307 if (fan_hd) {
308 pid_param.min =
309 max(pid_param.min, wf_control_get_min(fan_hd));
310 pid_param.max =
311 min(pid_param.max, wf_control_get_max(fan_hd));
312 }
313 wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
314
315 DBG("wf: System Fan control initialized.\n");
316 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
317 FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
318 return;
319
320 fail:
321
322 if (fan_system)
323 wf_control_set_max(fan_system);
324 if (fan_hd)
325 wf_control_set_max(fan_hd);
326}
327
328static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
329{
330 s32 new_setpoint, temp, scaled, cputarget;
331 int rc;
332
333 if (--st->ticks != 0) {
334 if (wf_smu_readjust)
335 goto readjust;
336 return;
337 }
338 st->ticks = WF_SMU_SYS_FANS_INTERVAL;
339
340 rc = wf_sensor_get(sensor_hd_temp, &temp);
341 if (rc) {
342 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
343 rc);
344 wf_smu_failure_state |= FAILURE_SENSOR;
345 return;
346 }
347
348 DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
349 FIX32TOPRINT(temp));
350
351 if (temp > (st->pid.param.itarget + 0x50000))
352 wf_smu_failure_state |= FAILURE_OVERTEMP;
353
354 new_setpoint = wf_pid_run(&st->pid, temp);
355
356 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
357
358 scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
359
360 DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
361
362 cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
363 cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
364 scaled = max(scaled, cputarget);
365 scaled = max(scaled, st->pid.param.min);
366 scaled = min(scaled, st->pid.param.max);
367
368 DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
369
370 if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
371 return;
372 st->sys_setpoint = scaled;
373 st->hd_setpoint = new_setpoint;
374 readjust:
375 if (fan_system && wf_smu_failure_state == 0) {
376 rc = wf_control_set(fan_system, st->sys_setpoint);
377 if (rc) {
378 printk(KERN_WARNING "windfarm: Sys fan error %d\n",
379 rc);
380 wf_smu_failure_state |= FAILURE_FAN;
381 }
382 }
383 if (fan_hd && wf_smu_failure_state == 0) {
384 rc = wf_control_set(fan_hd, st->hd_setpoint);
385 if (rc) {
386 printk(KERN_WARNING "windfarm: HD fan error %d\n",
387 rc);
388 wf_smu_failure_state |= FAILURE_FAN;
389 }
390 }
391}
392
393static void wf_smu_create_cpu_fans(void)
394{
395 struct wf_cpu_pid_param pid_param;
396 const struct smu_sdbp_header *hdr;
397 struct smu_sdbp_cpupiddata *piddata;
398 struct smu_sdbp_fvt *fvt;
399 s32 tmax, tdelta, maxpow, powadj;
400
401 /* First, locate the PID params in SMU SBD */
402 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
403 if (hdr == 0) {
404 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
405 "max fan speed\n");
406 goto fail;
407 }
408 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
409
410 /* Get the FVT params for operating point 0 (the only supported one
411 * for now) in order to get tmax
412 */
413 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
414 if (hdr) {
415 fvt = (struct smu_sdbp_fvt *)&hdr[1];
416 tmax = ((s32)fvt->maxtemp) << 16;
417 } else
418 tmax = 0x5e0000; /* 94 degree default */
419
420 /* Alloc & initialize state */
421 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
422 GFP_KERNEL);
423 if (wf_smu_cpu_fans == NULL)
424 goto fail;
425 wf_smu_cpu_fans->ticks = 1;
426
427 wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
428 wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
429
430 /* Fill PID params */
431 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
432 pid_param.history_len = piddata->history_len;
433 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
434 printk(KERN_WARNING "windfarm: History size overflow on "
435 "CPU control loop (%d)\n", piddata->history_len);
436 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
437 }
438 pid_param.gd = piddata->gd;
439 pid_param.gp = piddata->gp;
440 pid_param.gr = piddata->gr / pid_param.history_len;
441
442 tdelta = ((s32)piddata->target_temp_delta) << 16;
443 maxpow = ((s32)piddata->max_power) << 16;
444 powadj = ((s32)piddata->power_adj) << 16;
445
446 pid_param.tmax = tmax;
447 pid_param.ttarget = tmax - tdelta;
448 pid_param.pmaxadj = maxpow - powadj;
449
450 pid_param.min = wf_control_get_min(fan_cpu_main);
451 pid_param.max = wf_control_get_max(fan_cpu_main);
452
453 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
454
455 DBG("wf: CPU Fan control initialized.\n");
456 DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
457 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
458 pid_param.min, pid_param.max);
459
460 return;
461
462 fail:
463 printk(KERN_WARNING "windfarm: CPU fan config not found\n"
464 "for this machine model, max fan speed\n");
465
466 if (cpufreq_clamp)
467 wf_control_set_max(cpufreq_clamp);
468 if (fan_cpu_main)
469 wf_control_set_max(fan_cpu_main);
470}
471
472static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
473{
474 s32 new_setpoint, temp, power, systarget;
475 int rc;
476
477 if (--st->ticks != 0) {
478 if (wf_smu_readjust)
479 goto readjust;
480 return;
481 }
482 st->ticks = WF_SMU_CPU_FANS_INTERVAL;
483
484 rc = wf_sensor_get(sensor_cpu_temp, &temp);
485 if (rc) {
486 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
487 rc);
488 wf_smu_failure_state |= FAILURE_SENSOR;
489 return;
490 }
491
492 rc = wf_sensor_get(sensor_cpu_power, &power);
493 if (rc) {
494 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
495 rc);
496 wf_smu_failure_state |= FAILURE_SENSOR;
497 return;
498 }
499
500 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
501 FIX32TOPRINT(temp), FIX32TOPRINT(power));
502
503#ifdef HACKED_OVERTEMP
504 if (temp > 0x4a0000)
505 wf_smu_failure_state |= FAILURE_OVERTEMP;
506#else
507 if (temp > st->pid.param.tmax)
508 wf_smu_failure_state |= FAILURE_OVERTEMP;
509#endif
510 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
511
512 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
513
514 systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
515 systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
516 + st->offset;
517 new_setpoint = max(new_setpoint, systarget);
518 new_setpoint = max(new_setpoint, st->pid.param.min);
519 new_setpoint = min(new_setpoint, st->pid.param.max);
520
521 DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
522
523 if (st->cpu_setpoint == new_setpoint)
524 return;
525 st->cpu_setpoint = new_setpoint;
526 readjust:
527 if (fan_cpu_main && wf_smu_failure_state == 0) {
528 rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
529 if (rc) {
530 printk(KERN_WARNING "windfarm: CPU main fan"
531 " error %d\n", rc);
532 wf_smu_failure_state |= FAILURE_FAN;
533 }
534 }
535}
536
537/*
538 * ****** Setup / Init / Misc ... ******
539 *
540 */
541
542static void wf_smu_tick(void)
543{
544 unsigned int last_failure = wf_smu_failure_state;
545 unsigned int new_failure;
546
547 if (!wf_smu_started) {
548 DBG("wf: creating control loops !\n");
549 wf_smu_create_sys_fans();
550 wf_smu_create_cpu_fans();
551 wf_smu_started = true;
552 }
553
554 /* Skipping ticks */
555 if (wf_smu_skipping && --wf_smu_skipping)
556 return;
557
558 wf_smu_failure_state = 0;
559 if (wf_smu_sys_fans)
560 wf_smu_sys_fans_tick(wf_smu_sys_fans);
561 if (wf_smu_cpu_fans)
562 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
563
564 wf_smu_readjust = 0;
565 new_failure = wf_smu_failure_state & ~last_failure;
566
567 /* If entering failure mode, clamp cpufreq and ramp all
568 * fans to full speed.
569 */
570 if (wf_smu_failure_state && !last_failure) {
571 if (cpufreq_clamp)
572 wf_control_set_max(cpufreq_clamp);
573 if (fan_system)
574 wf_control_set_max(fan_system);
575 if (fan_cpu_main)
576 wf_control_set_max(fan_cpu_main);
577 if (fan_hd)
578 wf_control_set_max(fan_hd);
579 }
580
581 /* If leaving failure mode, unclamp cpufreq and readjust
582 * all fans on next iteration
583 */
584 if (!wf_smu_failure_state && last_failure) {
585 if (cpufreq_clamp)
586 wf_control_set_min(cpufreq_clamp);
587 wf_smu_readjust = 1;
588 }
589
590 /* Overtemp condition detected, notify and start skipping a couple
591 * ticks to let the temperature go down
592 */
593 if (new_failure & FAILURE_OVERTEMP) {
594 wf_set_overtemp();
595 wf_smu_skipping = 2;
596 wf_smu_overtemp = true;
597 }
598
599 /* We only clear the overtemp condition if overtemp is cleared
600 * _and_ no other failure is present. Since a sensor error will
601 * clear the overtemp condition (can't measure temperature) at
602 * the control loop levels, but we don't want to keep it clear
603 * here in this case
604 */
605 if (!wf_smu_failure_state && wf_smu_overtemp) {
606 wf_clear_overtemp();
607 wf_smu_overtemp = false;
608 }
609}
610
611static void wf_smu_new_control(struct wf_control *ct)
612{
613 if (wf_smu_all_controls_ok)
614 return;
615
616 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
617 if (wf_get_control(ct) == 0)
618 fan_cpu_main = ct;
619 }
620
621 if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
622 if (wf_get_control(ct) == 0)
623 fan_system = ct;
624 }
625
626 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
627 if (wf_get_control(ct) == 0)
628 cpufreq_clamp = ct;
629 }
630
631 /* Darwin property list says the HD fan is only for model ID
632 * 0, 1, 2 and 3
633 */
634
635 if (wf_smu_mach_model > 3) {
636 if (fan_system && fan_cpu_main && cpufreq_clamp)
637 wf_smu_all_controls_ok = 1;
638 return;
639 }
640
641 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
642 if (wf_get_control(ct) == 0)
643 fan_hd = ct;
644 }
645
646 if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
647 wf_smu_all_controls_ok = 1;
648}
649
650static void wf_smu_new_sensor(struct wf_sensor *sr)
651{
652 if (wf_smu_all_sensors_ok)
653 return;
654
655 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
656 if (wf_get_sensor(sr) == 0)
657 sensor_cpu_power = sr;
658 }
659
660 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
661 if (wf_get_sensor(sr) == 0)
662 sensor_cpu_temp = sr;
663 }
664
665 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
666 if (wf_get_sensor(sr) == 0)
667 sensor_hd_temp = sr;
668 }
669
670 if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
671 wf_smu_all_sensors_ok = 1;
672}
673
674
675static int wf_smu_notify(struct notifier_block *self,
676 unsigned long event, void *data)
677{
678 switch(event) {
679 case WF_EVENT_NEW_CONTROL:
680 DBG("wf: new control %s detected\n",
681 ((struct wf_control *)data)->name);
682 wf_smu_new_control(data);
683 wf_smu_readjust = 1;
684 break;
685 case WF_EVENT_NEW_SENSOR:
686 DBG("wf: new sensor %s detected\n",
687 ((struct wf_sensor *)data)->name);
688 wf_smu_new_sensor(data);
689 break;
690 case WF_EVENT_TICK:
691 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
692 wf_smu_tick();
693 }
694
695 return 0;
696}
697
698static struct notifier_block wf_smu_events = {
699 .notifier_call = wf_smu_notify,
700};
701
702static int wf_init_pm(void)
703{
704 const struct smu_sdbp_header *hdr;
705
706 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
707 if (hdr != 0) {
708 struct smu_sdbp_sensortree *st =
709 (struct smu_sdbp_sensortree *)&hdr[1];
710 wf_smu_mach_model = st->model_id;
711 }
712
713 printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
714 wf_smu_mach_model);
715
716 return 0;
717}
718
719static int wf_smu_probe(struct platform_device *ddev)
720{
721 wf_register_client(&wf_smu_events);
722
723 return 0;
724}
725
726static int wf_smu_remove(struct platform_device *ddev)
727{
728 wf_unregister_client(&wf_smu_events);
729
730 /* XXX We don't have yet a guarantee that our callback isn't
731 * in progress when returning from wf_unregister_client, so
732 * we add an arbitrary delay. I'll have to fix that in the core
733 */
734 msleep(1000);
735
736 /* Release all sensors */
737 /* One more crappy race: I don't think we have any guarantee here
738 * that the attribute callback won't race with the sensor beeing
739 * disposed of, and I'm not 100% certain what best way to deal
740 * with that except by adding locks all over... I'll do that
741 * eventually but heh, who ever rmmod this module anyway ?
742 */
743 if (sensor_cpu_power)
744 wf_put_sensor(sensor_cpu_power);
745 if (sensor_cpu_temp)
746 wf_put_sensor(sensor_cpu_temp);
747 if (sensor_hd_temp)
748 wf_put_sensor(sensor_hd_temp);
749
750 /* Release all controls */
751 if (fan_cpu_main)
752 wf_put_control(fan_cpu_main);
753 if (fan_hd)
754 wf_put_control(fan_hd);
755 if (fan_system)
756 wf_put_control(fan_system);
757 if (cpufreq_clamp)
758 wf_put_control(cpufreq_clamp);
759
760 /* Destroy control loops state structures */
761 kfree(wf_smu_sys_fans);
762 kfree(wf_smu_cpu_fans);
763
764 return 0;
765}
766
767static struct platform_driver wf_smu_driver = {
768 .probe = wf_smu_probe,
769 .remove = wf_smu_remove,
770 .driver = {
771 .name = "windfarm",
772 },
773};
774
775
776static int __init wf_smu_init(void)
777{
778 int rc = -ENODEV;
779
780 if (of_machine_is_compatible("PowerMac8,1") ||
781 of_machine_is_compatible("PowerMac8,2"))
782 rc = wf_init_pm();
783
784 if (rc == 0) {
785#ifdef MODULE
786 request_module("windfarm_smu_controls");
787 request_module("windfarm_smu_sensors");
788 request_module("windfarm_lm75_sensor");
789 request_module("windfarm_cpufreq_clamp");
790
791#endif /* MODULE */
792 platform_driver_register(&wf_smu_driver);
793 }
794
795 return rc;
796}
797
798static void __exit wf_smu_exit(void)
799{
800
801 platform_driver_unregister(&wf_smu_driver);
802}
803
804
805module_init(wf_smu_init);
806module_exit(wf_smu_exit);
807
808MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
809MODULE_DESCRIPTION("Thermal control logic for iMac G5");
810MODULE_LICENSE("GPL");
811MODULE_ALIAS("platform:windfarm");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Windfarm PowerMac thermal control. iMac G5
4 *
5 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
6 * <benh@kernel.crashing.org>
7 *
8 * The algorithm used is the PID control algorithm, used the same
9 * way the published Darwin code does, using the same values that
10 * are present in the Darwin 8.2 snapshot property lists (note however
11 * that none of the code has been re-used, it's a complete re-implementation
12 *
13 * The various control loops found in Darwin config file are:
14 *
15 * PowerMac8,1 and PowerMac8,2
16 * ===========================
17 *
18 * System Fans control loop. Different based on models. In addition to the
19 * usual PID algorithm, the control loop gets 2 additional pairs of linear
20 * scaling factors (scale/offsets) expressed as 4.12 fixed point values
21 * signed offset, unsigned scale)
22 *
23 * The targets are modified such as:
24 * - the linked control (second control) gets the target value as-is
25 * (typically the drive fan)
26 * - the main control (first control) gets the target value scaled with
27 * the first pair of factors, and is then modified as below
28 * - the value of the target of the CPU Fan control loop is retrieved,
29 * scaled with the second pair of factors, and the max of that and
30 * the scaled target is applied to the main control.
31 *
32 * # model_id: 2
33 * controls : system-fan, drive-bay-fan
34 * sensors : hd-temp
35 * PID params : G_d = 0x15400000
36 * G_p = 0x00200000
37 * G_r = 0x000002fd
38 * History = 2 entries
39 * Input target = 0x3a0000
40 * Interval = 5s
41 * linear-factors : offset = 0xff38 scale = 0x0ccd
42 * offset = 0x0208 scale = 0x07ae
43 *
44 * # model_id: 3
45 * controls : system-fan, drive-bay-fan
46 * sensors : hd-temp
47 * PID params : G_d = 0x08e00000
48 * G_p = 0x00566666
49 * G_r = 0x0000072b
50 * History = 2 entries
51 * Input target = 0x350000
52 * Interval = 5s
53 * linear-factors : offset = 0xff38 scale = 0x0ccd
54 * offset = 0x0000 scale = 0x0000
55 *
56 * # model_id: 5
57 * controls : system-fan
58 * sensors : hd-temp
59 * PID params : G_d = 0x15400000
60 * G_p = 0x00233333
61 * G_r = 0x000002fd
62 * History = 2 entries
63 * Input target = 0x3a0000
64 * Interval = 5s
65 * linear-factors : offset = 0x0000 scale = 0x1000
66 * offset = 0x0091 scale = 0x0bae
67 *
68 * CPU Fan control loop. The loop is identical for all models. it
69 * has an additional pair of scaling factor. This is used to scale the
70 * systems fan control loop target result (the one before it gets scaled
71 * by the System Fans control loop itself). Then, the max value of the
72 * calculated target value and system fan value is sent to the fans
73 *
74 * controls : cpu-fan
75 * sensors : cpu-temp cpu-power
76 * PID params : From SMU sdb partition
77 * linear-factors : offset = 0xfb50 scale = 0x1000
78 *
79 * CPU Slew control loop. Not implemented. The cpufreq driver in linux is
80 * completely separate for now, though we could find a way to link it, either
81 * as a client reacting to overtemp notifications, or directling monitoring
82 * the CPU temperature
83 *
84 * WARNING ! The CPU control loop requires the CPU tmax for the current
85 * operating point. However, we currently are completely separated from
86 * the cpufreq driver and thus do not know what the current operating
87 * point is. Fortunately, we also do not have any hardware supporting anything
88 * but operating point 0 at the moment, thus we just peek that value directly
89 * from the SDB partition. If we ever end up with actually slewing the system
90 * clock and thus changing operating points, we'll have to find a way to
91 * communicate with the CPU freq driver;
92 */
93
94#include <linux/types.h>
95#include <linux/errno.h>
96#include <linux/kernel.h>
97#include <linux/delay.h>
98#include <linux/slab.h>
99#include <linux/init.h>
100#include <linux/spinlock.h>
101#include <linux/wait.h>
102#include <linux/kmod.h>
103#include <linux/device.h>
104#include <linux/platform_device.h>
105#include <asm/prom.h>
106#include <asm/machdep.h>
107#include <asm/io.h>
108#include <asm/sections.h>
109#include <asm/smu.h>
110
111#include "windfarm.h"
112#include "windfarm_pid.h"
113
114#define VERSION "0.4"
115
116#undef DEBUG
117
118#ifdef DEBUG
119#define DBG(args...) printk(args)
120#else
121#define DBG(args...) do { } while(0)
122#endif
123
124/* define this to force CPU overtemp to 74 degree, useful for testing
125 * the overtemp code
126 */
127#undef HACKED_OVERTEMP
128
129static int wf_smu_mach_model; /* machine model id */
130
131/* Controls & sensors */
132static struct wf_sensor *sensor_cpu_power;
133static struct wf_sensor *sensor_cpu_temp;
134static struct wf_sensor *sensor_hd_temp;
135static struct wf_control *fan_cpu_main;
136static struct wf_control *fan_hd;
137static struct wf_control *fan_system;
138static struct wf_control *cpufreq_clamp;
139
140/* Set to kick the control loop into life */
141static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok;
142static bool wf_smu_started;
143
144/* Failure handling.. could be nicer */
145#define FAILURE_FAN 0x01
146#define FAILURE_SENSOR 0x02
147#define FAILURE_OVERTEMP 0x04
148
149static unsigned int wf_smu_failure_state;
150static int wf_smu_readjust, wf_smu_skipping;
151static bool wf_smu_overtemp;
152
153/*
154 * ****** System Fans Control Loop ******
155 *
156 */
157
158/* Parameters for the System Fans control loop. Parameters
159 * not in this table such as interval, history size, ...
160 * are common to all versions and thus hard coded for now.
161 */
162struct wf_smu_sys_fans_param {
163 int model_id;
164 s32 itarget;
165 s32 gd, gp, gr;
166
167 s16 offset0;
168 u16 scale0;
169 s16 offset1;
170 u16 scale1;
171};
172
173#define WF_SMU_SYS_FANS_INTERVAL 5
174#define WF_SMU_SYS_FANS_HISTORY_SIZE 2
175
176/* State data used by the system fans control loop
177 */
178struct wf_smu_sys_fans_state {
179 int ticks;
180 s32 sys_setpoint;
181 s32 hd_setpoint;
182 s16 offset0;
183 u16 scale0;
184 s16 offset1;
185 u16 scale1;
186 struct wf_pid_state pid;
187};
188
189/*
190 * Configs for SMU System Fan control loop
191 */
192static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
193 /* Model ID 2 */
194 {
195 .model_id = 2,
196 .itarget = 0x3a0000,
197 .gd = 0x15400000,
198 .gp = 0x00200000,
199 .gr = 0x000002fd,
200 .offset0 = 0xff38,
201 .scale0 = 0x0ccd,
202 .offset1 = 0x0208,
203 .scale1 = 0x07ae,
204 },
205 /* Model ID 3 */
206 {
207 .model_id = 3,
208 .itarget = 0x350000,
209 .gd = 0x08e00000,
210 .gp = 0x00566666,
211 .gr = 0x0000072b,
212 .offset0 = 0xff38,
213 .scale0 = 0x0ccd,
214 .offset1 = 0x0000,
215 .scale1 = 0x0000,
216 },
217 /* Model ID 5 */
218 {
219 .model_id = 5,
220 .itarget = 0x3a0000,
221 .gd = 0x15400000,
222 .gp = 0x00233333,
223 .gr = 0x000002fd,
224 .offset0 = 0x0000,
225 .scale0 = 0x1000,
226 .offset1 = 0x0091,
227 .scale1 = 0x0bae,
228 },
229};
230#define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
231
232static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
233
234/*
235 * ****** CPU Fans Control Loop ******
236 *
237 */
238
239
240#define WF_SMU_CPU_FANS_INTERVAL 1
241#define WF_SMU_CPU_FANS_MAX_HISTORY 16
242#define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000
243#define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50
244
245/* State data used by the cpu fans control loop
246 */
247struct wf_smu_cpu_fans_state {
248 int ticks;
249 s32 cpu_setpoint;
250 s32 scale;
251 s32 offset;
252 struct wf_cpu_pid_state pid;
253};
254
255static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
256
257
258
259/*
260 * ***** Implementation *****
261 *
262 */
263
264static void wf_smu_create_sys_fans(void)
265{
266 struct wf_smu_sys_fans_param *param = NULL;
267 struct wf_pid_param pid_param;
268 int i;
269
270 /* First, locate the params for this model */
271 for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
272 if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
273 param = &wf_smu_sys_all_params[i];
274 break;
275 }
276
277 /* No params found, put fans to max */
278 if (param == NULL) {
279 printk(KERN_WARNING "windfarm: System fan config not found "
280 "for this machine model, max fan speed\n");
281 goto fail;
282 }
283
284 /* Alloc & initialize state */
285 wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
286 GFP_KERNEL);
287 if (wf_smu_sys_fans == NULL) {
288 printk(KERN_WARNING "windfarm: Memory allocation error"
289 " max fan speed\n");
290 goto fail;
291 }
292 wf_smu_sys_fans->ticks = 1;
293 wf_smu_sys_fans->scale0 = param->scale0;
294 wf_smu_sys_fans->offset0 = param->offset0;
295 wf_smu_sys_fans->scale1 = param->scale1;
296 wf_smu_sys_fans->offset1 = param->offset1;
297
298 /* Fill PID params */
299 pid_param.gd = param->gd;
300 pid_param.gp = param->gp;
301 pid_param.gr = param->gr;
302 pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
303 pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
304 pid_param.itarget = param->itarget;
305 pid_param.min = wf_control_get_min(fan_system);
306 pid_param.max = wf_control_get_max(fan_system);
307 if (fan_hd) {
308 pid_param.min =
309 max(pid_param.min, wf_control_get_min(fan_hd));
310 pid_param.max =
311 min(pid_param.max, wf_control_get_max(fan_hd));
312 }
313 wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
314
315 DBG("wf: System Fan control initialized.\n");
316 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
317 FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
318 return;
319
320 fail:
321
322 if (fan_system)
323 wf_control_set_max(fan_system);
324 if (fan_hd)
325 wf_control_set_max(fan_hd);
326}
327
328static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
329{
330 s32 new_setpoint, temp, scaled, cputarget;
331 int rc;
332
333 if (--st->ticks != 0) {
334 if (wf_smu_readjust)
335 goto readjust;
336 return;
337 }
338 st->ticks = WF_SMU_SYS_FANS_INTERVAL;
339
340 rc = wf_sensor_get(sensor_hd_temp, &temp);
341 if (rc) {
342 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
343 rc);
344 wf_smu_failure_state |= FAILURE_SENSOR;
345 return;
346 }
347
348 DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
349 FIX32TOPRINT(temp));
350
351 if (temp > (st->pid.param.itarget + 0x50000))
352 wf_smu_failure_state |= FAILURE_OVERTEMP;
353
354 new_setpoint = wf_pid_run(&st->pid, temp);
355
356 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
357
358 scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
359
360 DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
361
362 cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
363 cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
364 scaled = max(scaled, cputarget);
365 scaled = max(scaled, st->pid.param.min);
366 scaled = min(scaled, st->pid.param.max);
367
368 DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
369
370 if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
371 return;
372 st->sys_setpoint = scaled;
373 st->hd_setpoint = new_setpoint;
374 readjust:
375 if (fan_system && wf_smu_failure_state == 0) {
376 rc = wf_control_set(fan_system, st->sys_setpoint);
377 if (rc) {
378 printk(KERN_WARNING "windfarm: Sys fan error %d\n",
379 rc);
380 wf_smu_failure_state |= FAILURE_FAN;
381 }
382 }
383 if (fan_hd && wf_smu_failure_state == 0) {
384 rc = wf_control_set(fan_hd, st->hd_setpoint);
385 if (rc) {
386 printk(KERN_WARNING "windfarm: HD fan error %d\n",
387 rc);
388 wf_smu_failure_state |= FAILURE_FAN;
389 }
390 }
391}
392
393static void wf_smu_create_cpu_fans(void)
394{
395 struct wf_cpu_pid_param pid_param;
396 const struct smu_sdbp_header *hdr;
397 struct smu_sdbp_cpupiddata *piddata;
398 struct smu_sdbp_fvt *fvt;
399 s32 tmax, tdelta, maxpow, powadj;
400
401 /* First, locate the PID params in SMU SBD */
402 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
403 if (hdr == 0) {
404 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
405 "max fan speed\n");
406 goto fail;
407 }
408 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
409
410 /* Get the FVT params for operating point 0 (the only supported one
411 * for now) in order to get tmax
412 */
413 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
414 if (hdr) {
415 fvt = (struct smu_sdbp_fvt *)&hdr[1];
416 tmax = ((s32)fvt->maxtemp) << 16;
417 } else
418 tmax = 0x5e0000; /* 94 degree default */
419
420 /* Alloc & initialize state */
421 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
422 GFP_KERNEL);
423 if (wf_smu_cpu_fans == NULL)
424 goto fail;
425 wf_smu_cpu_fans->ticks = 1;
426
427 wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
428 wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
429
430 /* Fill PID params */
431 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
432 pid_param.history_len = piddata->history_len;
433 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
434 printk(KERN_WARNING "windfarm: History size overflow on "
435 "CPU control loop (%d)\n", piddata->history_len);
436 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
437 }
438 pid_param.gd = piddata->gd;
439 pid_param.gp = piddata->gp;
440 pid_param.gr = piddata->gr / pid_param.history_len;
441
442 tdelta = ((s32)piddata->target_temp_delta) << 16;
443 maxpow = ((s32)piddata->max_power) << 16;
444 powadj = ((s32)piddata->power_adj) << 16;
445
446 pid_param.tmax = tmax;
447 pid_param.ttarget = tmax - tdelta;
448 pid_param.pmaxadj = maxpow - powadj;
449
450 pid_param.min = wf_control_get_min(fan_cpu_main);
451 pid_param.max = wf_control_get_max(fan_cpu_main);
452
453 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
454
455 DBG("wf: CPU Fan control initialized.\n");
456 DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
457 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
458 pid_param.min, pid_param.max);
459
460 return;
461
462 fail:
463 printk(KERN_WARNING "windfarm: CPU fan config not found\n"
464 "for this machine model, max fan speed\n");
465
466 if (cpufreq_clamp)
467 wf_control_set_max(cpufreq_clamp);
468 if (fan_cpu_main)
469 wf_control_set_max(fan_cpu_main);
470}
471
472static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
473{
474 s32 new_setpoint, temp, power, systarget;
475 int rc;
476
477 if (--st->ticks != 0) {
478 if (wf_smu_readjust)
479 goto readjust;
480 return;
481 }
482 st->ticks = WF_SMU_CPU_FANS_INTERVAL;
483
484 rc = wf_sensor_get(sensor_cpu_temp, &temp);
485 if (rc) {
486 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
487 rc);
488 wf_smu_failure_state |= FAILURE_SENSOR;
489 return;
490 }
491
492 rc = wf_sensor_get(sensor_cpu_power, &power);
493 if (rc) {
494 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
495 rc);
496 wf_smu_failure_state |= FAILURE_SENSOR;
497 return;
498 }
499
500 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
501 FIX32TOPRINT(temp), FIX32TOPRINT(power));
502
503#ifdef HACKED_OVERTEMP
504 if (temp > 0x4a0000)
505 wf_smu_failure_state |= FAILURE_OVERTEMP;
506#else
507 if (temp > st->pid.param.tmax)
508 wf_smu_failure_state |= FAILURE_OVERTEMP;
509#endif
510 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
511
512 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
513
514 systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
515 systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
516 + st->offset;
517 new_setpoint = max(new_setpoint, systarget);
518 new_setpoint = max(new_setpoint, st->pid.param.min);
519 new_setpoint = min(new_setpoint, st->pid.param.max);
520
521 DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
522
523 if (st->cpu_setpoint == new_setpoint)
524 return;
525 st->cpu_setpoint = new_setpoint;
526 readjust:
527 if (fan_cpu_main && wf_smu_failure_state == 0) {
528 rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
529 if (rc) {
530 printk(KERN_WARNING "windfarm: CPU main fan"
531 " error %d\n", rc);
532 wf_smu_failure_state |= FAILURE_FAN;
533 }
534 }
535}
536
537/*
538 * ****** Setup / Init / Misc ... ******
539 *
540 */
541
542static void wf_smu_tick(void)
543{
544 unsigned int last_failure = wf_smu_failure_state;
545 unsigned int new_failure;
546
547 if (!wf_smu_started) {
548 DBG("wf: creating control loops !\n");
549 wf_smu_create_sys_fans();
550 wf_smu_create_cpu_fans();
551 wf_smu_started = true;
552 }
553
554 /* Skipping ticks */
555 if (wf_smu_skipping && --wf_smu_skipping)
556 return;
557
558 wf_smu_failure_state = 0;
559 if (wf_smu_sys_fans)
560 wf_smu_sys_fans_tick(wf_smu_sys_fans);
561 if (wf_smu_cpu_fans)
562 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
563
564 wf_smu_readjust = 0;
565 new_failure = wf_smu_failure_state & ~last_failure;
566
567 /* If entering failure mode, clamp cpufreq and ramp all
568 * fans to full speed.
569 */
570 if (wf_smu_failure_state && !last_failure) {
571 if (cpufreq_clamp)
572 wf_control_set_max(cpufreq_clamp);
573 if (fan_system)
574 wf_control_set_max(fan_system);
575 if (fan_cpu_main)
576 wf_control_set_max(fan_cpu_main);
577 if (fan_hd)
578 wf_control_set_max(fan_hd);
579 }
580
581 /* If leaving failure mode, unclamp cpufreq and readjust
582 * all fans on next iteration
583 */
584 if (!wf_smu_failure_state && last_failure) {
585 if (cpufreq_clamp)
586 wf_control_set_min(cpufreq_clamp);
587 wf_smu_readjust = 1;
588 }
589
590 /* Overtemp condition detected, notify and start skipping a couple
591 * ticks to let the temperature go down
592 */
593 if (new_failure & FAILURE_OVERTEMP) {
594 wf_set_overtemp();
595 wf_smu_skipping = 2;
596 wf_smu_overtemp = true;
597 }
598
599 /* We only clear the overtemp condition if overtemp is cleared
600 * _and_ no other failure is present. Since a sensor error will
601 * clear the overtemp condition (can't measure temperature) at
602 * the control loop levels, but we don't want to keep it clear
603 * here in this case
604 */
605 if (!wf_smu_failure_state && wf_smu_overtemp) {
606 wf_clear_overtemp();
607 wf_smu_overtemp = false;
608 }
609}
610
611static void wf_smu_new_control(struct wf_control *ct)
612{
613 if (wf_smu_all_controls_ok)
614 return;
615
616 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
617 if (wf_get_control(ct) == 0)
618 fan_cpu_main = ct;
619 }
620
621 if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
622 if (wf_get_control(ct) == 0)
623 fan_system = ct;
624 }
625
626 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
627 if (wf_get_control(ct) == 0)
628 cpufreq_clamp = ct;
629 }
630
631 /* Darwin property list says the HD fan is only for model ID
632 * 0, 1, 2 and 3
633 */
634
635 if (wf_smu_mach_model > 3) {
636 if (fan_system && fan_cpu_main && cpufreq_clamp)
637 wf_smu_all_controls_ok = 1;
638 return;
639 }
640
641 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
642 if (wf_get_control(ct) == 0)
643 fan_hd = ct;
644 }
645
646 if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
647 wf_smu_all_controls_ok = 1;
648}
649
650static void wf_smu_new_sensor(struct wf_sensor *sr)
651{
652 if (wf_smu_all_sensors_ok)
653 return;
654
655 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
656 if (wf_get_sensor(sr) == 0)
657 sensor_cpu_power = sr;
658 }
659
660 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
661 if (wf_get_sensor(sr) == 0)
662 sensor_cpu_temp = sr;
663 }
664
665 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
666 if (wf_get_sensor(sr) == 0)
667 sensor_hd_temp = sr;
668 }
669
670 if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
671 wf_smu_all_sensors_ok = 1;
672}
673
674
675static int wf_smu_notify(struct notifier_block *self,
676 unsigned long event, void *data)
677{
678 switch(event) {
679 case WF_EVENT_NEW_CONTROL:
680 DBG("wf: new control %s detected\n",
681 ((struct wf_control *)data)->name);
682 wf_smu_new_control(data);
683 wf_smu_readjust = 1;
684 break;
685 case WF_EVENT_NEW_SENSOR:
686 DBG("wf: new sensor %s detected\n",
687 ((struct wf_sensor *)data)->name);
688 wf_smu_new_sensor(data);
689 break;
690 case WF_EVENT_TICK:
691 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
692 wf_smu_tick();
693 }
694
695 return 0;
696}
697
698static struct notifier_block wf_smu_events = {
699 .notifier_call = wf_smu_notify,
700};
701
702static int wf_init_pm(void)
703{
704 const struct smu_sdbp_header *hdr;
705
706 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
707 if (hdr != 0) {
708 struct smu_sdbp_sensortree *st =
709 (struct smu_sdbp_sensortree *)&hdr[1];
710 wf_smu_mach_model = st->model_id;
711 }
712
713 printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
714 wf_smu_mach_model);
715
716 return 0;
717}
718
719static int wf_smu_probe(struct platform_device *ddev)
720{
721 wf_register_client(&wf_smu_events);
722
723 return 0;
724}
725
726static int wf_smu_remove(struct platform_device *ddev)
727{
728 wf_unregister_client(&wf_smu_events);
729
730 /* XXX We don't have yet a guarantee that our callback isn't
731 * in progress when returning from wf_unregister_client, so
732 * we add an arbitrary delay. I'll have to fix that in the core
733 */
734 msleep(1000);
735
736 /* Release all sensors */
737 /* One more crappy race: I don't think we have any guarantee here
738 * that the attribute callback won't race with the sensor beeing
739 * disposed of, and I'm not 100% certain what best way to deal
740 * with that except by adding locks all over... I'll do that
741 * eventually but heh, who ever rmmod this module anyway ?
742 */
743 if (sensor_cpu_power)
744 wf_put_sensor(sensor_cpu_power);
745 if (sensor_cpu_temp)
746 wf_put_sensor(sensor_cpu_temp);
747 if (sensor_hd_temp)
748 wf_put_sensor(sensor_hd_temp);
749
750 /* Release all controls */
751 if (fan_cpu_main)
752 wf_put_control(fan_cpu_main);
753 if (fan_hd)
754 wf_put_control(fan_hd);
755 if (fan_system)
756 wf_put_control(fan_system);
757 if (cpufreq_clamp)
758 wf_put_control(cpufreq_clamp);
759
760 /* Destroy control loops state structures */
761 kfree(wf_smu_sys_fans);
762 kfree(wf_smu_cpu_fans);
763
764 return 0;
765}
766
767static struct platform_driver wf_smu_driver = {
768 .probe = wf_smu_probe,
769 .remove = wf_smu_remove,
770 .driver = {
771 .name = "windfarm",
772 },
773};
774
775
776static int __init wf_smu_init(void)
777{
778 int rc = -ENODEV;
779
780 if (of_machine_is_compatible("PowerMac8,1") ||
781 of_machine_is_compatible("PowerMac8,2"))
782 rc = wf_init_pm();
783
784 if (rc == 0) {
785#ifdef MODULE
786 request_module("windfarm_smu_controls");
787 request_module("windfarm_smu_sensors");
788 request_module("windfarm_lm75_sensor");
789 request_module("windfarm_cpufreq_clamp");
790
791#endif /* MODULE */
792 platform_driver_register(&wf_smu_driver);
793 }
794
795 return rc;
796}
797
798static void __exit wf_smu_exit(void)
799{
800
801 platform_driver_unregister(&wf_smu_driver);
802}
803
804
805module_init(wf_smu_init);
806module_exit(wf_smu_exit);
807
808MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
809MODULE_DESCRIPTION("Thermal control logic for iMac G5");
810MODULE_LICENSE("GPL");
811MODULE_ALIAS("platform:windfarm");