Commit | Line | Data |
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75722d39 BH |
1 | /* |
2 | * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops | |
3 | * | |
4 | * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. | |
5 | * <benh@kernel.crashing.org> | |
6 | * | |
7 | * Released under the term of the GNU GPL v2. | |
8 | * | |
9 | * The algorithm used is the PID control algorithm, used the same | |
10 | * way the published Darwin code does, using the same values that | |
11 | * are present in the Darwin 8.2 snapshot property lists (note however | |
12 | * that none of the code has been re-used, it's a complete re-implementation | |
13 | * | |
14 | * The various control loops found in Darwin config file are: | |
15 | * | |
16 | * PowerMac9,1 | |
17 | * =========== | |
18 | * | |
19 | * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't | |
20 | * try to play with other control loops fans). Drive bay is rather basic PID | |
21 | * with one sensor and one fan. Slots area is a bit different as the Darwin | |
22 | * driver is supposed to be capable of working in a special "AGP" mode which | |
23 | * involves the presence of an AGP sensor and an AGP fan (possibly on the | |
24 | * AGP card itself). I can't deal with that special mode as I don't have | |
25 | * access to those additional sensor/fans for now (though ultimately, it would | |
26 | * be possible to add sensor objects for them) so I'm only implementing the | |
27 | * basic PCI slot control loop | |
28 | */ | |
29 | ||
30 | #include <linux/types.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/delay.h> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/spinlock.h> | |
37 | #include <linux/wait.h> | |
38 | #include <linux/kmod.h> | |
39 | #include <linux/device.h> | |
40 | #include <linux/platform_device.h> | |
41 | #include <asm/prom.h> | |
42 | #include <asm/machdep.h> | |
43 | #include <asm/io.h> | |
75722d39 BH |
44 | #include <asm/sections.h> |
45 | #include <asm/smu.h> | |
46 | ||
47 | #include "windfarm.h" | |
48 | #include "windfarm_pid.h" | |
49 | ||
50 | #define VERSION "0.4" | |
51 | ||
52 | #undef DEBUG | |
53 | ||
54 | #ifdef DEBUG | |
55 | #define DBG(args...) printk(args) | |
56 | #else | |
57 | #define DBG(args...) do { } while(0) | |
58 | #endif | |
59 | ||
60 | /* define this to force CPU overtemp to 74 degree, useful for testing | |
61 | * the overtemp code | |
62 | */ | |
63 | #undef HACKED_OVERTEMP | |
64 | ||
75722d39 BH |
65 | /* Controls & sensors */ |
66 | static struct wf_sensor *sensor_cpu_power; | |
67 | static struct wf_sensor *sensor_cpu_temp; | |
68 | static struct wf_sensor *sensor_hd_temp; | |
69 | static struct wf_sensor *sensor_slots_power; | |
70 | static struct wf_control *fan_cpu_main; | |
71 | static struct wf_control *fan_cpu_second; | |
72 | static struct wf_control *fan_cpu_third; | |
73 | static struct wf_control *fan_hd; | |
74 | static struct wf_control *fan_slots; | |
75 | static struct wf_control *cpufreq_clamp; | |
76 | ||
77 | /* Set to kick the control loop into life */ | |
4f256d56 GS |
78 | static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok; |
79 | static bool wf_smu_started; | |
4bb29711 | 80 | static bool wf_smu_overtemp; |
75722d39 BH |
81 | |
82 | /* Failure handling.. could be nicer */ | |
83 | #define FAILURE_FAN 0x01 | |
84 | #define FAILURE_SENSOR 0x02 | |
85 | #define FAILURE_OVERTEMP 0x04 | |
86 | ||
87 | static unsigned int wf_smu_failure_state; | |
88 | static int wf_smu_readjust, wf_smu_skipping; | |
89 | ||
90 | /* | |
91 | * ****** CPU Fans Control Loop ****** | |
92 | * | |
93 | */ | |
94 | ||
95 | ||
96 | #define WF_SMU_CPU_FANS_INTERVAL 1 | |
97 | #define WF_SMU_CPU_FANS_MAX_HISTORY 16 | |
98 | ||
99 | /* State data used by the cpu fans control loop | |
100 | */ | |
101 | struct wf_smu_cpu_fans_state { | |
102 | int ticks; | |
103 | s32 cpu_setpoint; | |
104 | struct wf_cpu_pid_state pid; | |
105 | }; | |
106 | ||
107 | static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; | |
108 | ||
109 | ||
110 | ||
111 | /* | |
112 | * ****** Drive Fan Control Loop ****** | |
113 | * | |
114 | */ | |
115 | ||
116 | struct wf_smu_drive_fans_state { | |
117 | int ticks; | |
118 | s32 setpoint; | |
119 | struct wf_pid_state pid; | |
120 | }; | |
121 | ||
122 | static struct wf_smu_drive_fans_state *wf_smu_drive_fans; | |
123 | ||
124 | /* | |
125 | * ****** Slots Fan Control Loop ****** | |
126 | * | |
127 | */ | |
128 | ||
129 | struct wf_smu_slots_fans_state { | |
130 | int ticks; | |
131 | s32 setpoint; | |
132 | struct wf_pid_state pid; | |
133 | }; | |
134 | ||
135 | static struct wf_smu_slots_fans_state *wf_smu_slots_fans; | |
136 | ||
137 | /* | |
138 | * ***** Implementation ***** | |
139 | * | |
140 | */ | |
141 | ||
142 | ||
143 | static void wf_smu_create_cpu_fans(void) | |
144 | { | |
145 | struct wf_cpu_pid_param pid_param; | |
018a3d1d | 146 | const struct smu_sdbp_header *hdr; |
75722d39 BH |
147 | struct smu_sdbp_cpupiddata *piddata; |
148 | struct smu_sdbp_fvt *fvt; | |
149 | s32 tmax, tdelta, maxpow, powadj; | |
150 | ||
151 | /* First, locate the PID params in SMU SBD */ | |
152 | hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); | |
153 | if (hdr == 0) { | |
154 | printk(KERN_WARNING "windfarm: CPU PID fan config not found " | |
155 | "max fan speed\n"); | |
156 | goto fail; | |
157 | } | |
158 | piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; | |
159 | ||
160 | /* Get the FVT params for operating point 0 (the only supported one | |
161 | * for now) in order to get tmax | |
162 | */ | |
163 | hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); | |
164 | if (hdr) { | |
165 | fvt = (struct smu_sdbp_fvt *)&hdr[1]; | |
166 | tmax = ((s32)fvt->maxtemp) << 16; | |
167 | } else | |
168 | tmax = 0x5e0000; /* 94 degree default */ | |
169 | ||
170 | /* Alloc & initialize state */ | |
171 | wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), | |
172 | GFP_KERNEL); | |
173 | if (wf_smu_cpu_fans == NULL) | |
174 | goto fail; | |
175 | wf_smu_cpu_fans->ticks = 1; | |
176 | ||
177 | /* Fill PID params */ | |
178 | pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; | |
179 | pid_param.history_len = piddata->history_len; | |
180 | if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { | |
181 | printk(KERN_WARNING "windfarm: History size overflow on " | |
182 | "CPU control loop (%d)\n", piddata->history_len); | |
183 | pid_param.history_len = WF_CPU_PID_MAX_HISTORY; | |
184 | } | |
185 | pid_param.gd = piddata->gd; | |
186 | pid_param.gp = piddata->gp; | |
187 | pid_param.gr = piddata->gr / pid_param.history_len; | |
188 | ||
189 | tdelta = ((s32)piddata->target_temp_delta) << 16; | |
190 | maxpow = ((s32)piddata->max_power) << 16; | |
191 | powadj = ((s32)piddata->power_adj) << 16; | |
192 | ||
193 | pid_param.tmax = tmax; | |
194 | pid_param.ttarget = tmax - tdelta; | |
195 | pid_param.pmaxadj = maxpow - powadj; | |
196 | ||
33e6820b BH |
197 | pid_param.min = wf_control_get_min(fan_cpu_main); |
198 | pid_param.max = wf_control_get_max(fan_cpu_main); | |
75722d39 BH |
199 | |
200 | wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); | |
201 | ||
202 | DBG("wf: CPU Fan control initialized.\n"); | |
942cc40a | 203 | DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", |
75722d39 BH |
204 | FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), |
205 | pid_param.min, pid_param.max); | |
206 | ||
207 | return; | |
208 | ||
209 | fail: | |
210 | printk(KERN_WARNING "windfarm: CPU fan config not found\n" | |
211 | "for this machine model, max fan speed\n"); | |
212 | ||
213 | if (cpufreq_clamp) | |
214 | wf_control_set_max(cpufreq_clamp); | |
215 | if (fan_cpu_main) | |
216 | wf_control_set_max(fan_cpu_main); | |
217 | } | |
218 | ||
219 | static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) | |
220 | { | |
221 | s32 new_setpoint, temp, power; | |
222 | int rc; | |
223 | ||
224 | if (--st->ticks != 0) { | |
225 | if (wf_smu_readjust) | |
226 | goto readjust; | |
227 | return; | |
228 | } | |
229 | st->ticks = WF_SMU_CPU_FANS_INTERVAL; | |
230 | ||
33e6820b | 231 | rc = wf_sensor_get(sensor_cpu_temp, &temp); |
75722d39 BH |
232 | if (rc) { |
233 | printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", | |
234 | rc); | |
235 | wf_smu_failure_state |= FAILURE_SENSOR; | |
236 | return; | |
237 | } | |
238 | ||
ca7d593e | 239 | rc = wf_sensor_get(sensor_cpu_power, &power); |
75722d39 BH |
240 | if (rc) { |
241 | printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", | |
242 | rc); | |
243 | wf_smu_failure_state |= FAILURE_SENSOR; | |
244 | return; | |
245 | } | |
246 | ||
247 | DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", | |
248 | FIX32TOPRINT(temp), FIX32TOPRINT(power)); | |
249 | ||
250 | #ifdef HACKED_OVERTEMP | |
251 | if (temp > 0x4a0000) | |
252 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
253 | #else | |
254 | if (temp > st->pid.param.tmax) | |
255 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
256 | #endif | |
257 | new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); | |
258 | ||
259 | DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); | |
260 | ||
261 | if (st->cpu_setpoint == new_setpoint) | |
262 | return; | |
263 | st->cpu_setpoint = new_setpoint; | |
264 | readjust: | |
265 | if (fan_cpu_main && wf_smu_failure_state == 0) { | |
33e6820b | 266 | rc = wf_control_set(fan_cpu_main, st->cpu_setpoint); |
75722d39 BH |
267 | if (rc) { |
268 | printk(KERN_WARNING "windfarm: CPU main fan" | |
269 | " error %d\n", rc); | |
270 | wf_smu_failure_state |= FAILURE_FAN; | |
271 | } | |
272 | } | |
273 | if (fan_cpu_second && wf_smu_failure_state == 0) { | |
33e6820b | 274 | rc = wf_control_set(fan_cpu_second, st->cpu_setpoint); |
75722d39 BH |
275 | if (rc) { |
276 | printk(KERN_WARNING "windfarm: CPU second fan" | |
277 | " error %d\n", rc); | |
278 | wf_smu_failure_state |= FAILURE_FAN; | |
279 | } | |
280 | } | |
281 | if (fan_cpu_third && wf_smu_failure_state == 0) { | |
33e6820b | 282 | rc = wf_control_set(fan_cpu_third, st->cpu_setpoint); |
75722d39 BH |
283 | if (rc) { |
284 | printk(KERN_WARNING "windfarm: CPU third fan" | |
285 | " error %d\n", rc); | |
286 | wf_smu_failure_state |= FAILURE_FAN; | |
287 | } | |
288 | } | |
289 | } | |
290 | ||
291 | static void wf_smu_create_drive_fans(void) | |
292 | { | |
293 | struct wf_pid_param param = { | |
294 | .interval = 5, | |
295 | .history_len = 2, | |
296 | .gd = 0x01e00000, | |
297 | .gp = 0x00500000, | |
298 | .gr = 0x00000000, | |
299 | .itarget = 0x00200000, | |
300 | }; | |
301 | ||
302 | /* Alloc & initialize state */ | |
303 | wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state), | |
304 | GFP_KERNEL); | |
305 | if (wf_smu_drive_fans == NULL) { | |
306 | printk(KERN_WARNING "windfarm: Memory allocation error" | |
307 | " max fan speed\n"); | |
308 | goto fail; | |
309 | } | |
310 | wf_smu_drive_fans->ticks = 1; | |
311 | ||
312 | /* Fill PID params */ | |
313 | param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN); | |
33e6820b BH |
314 | param.min = wf_control_get_min(fan_hd); |
315 | param.max = wf_control_get_max(fan_hd); | |
75722d39 BH |
316 | wf_pid_init(&wf_smu_drive_fans->pid, ¶m); |
317 | ||
318 | DBG("wf: Drive Fan control initialized.\n"); | |
319 | DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", | |
320 | FIX32TOPRINT(param.itarget), param.min, param.max); | |
321 | return; | |
322 | ||
323 | fail: | |
324 | if (fan_hd) | |
325 | wf_control_set_max(fan_hd); | |
326 | } | |
327 | ||
328 | static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st) | |
329 | { | |
330 | s32 new_setpoint, temp; | |
331 | int rc; | |
332 | ||
333 | if (--st->ticks != 0) { | |
334 | if (wf_smu_readjust) | |
335 | goto readjust; | |
336 | return; | |
337 | } | |
338 | st->ticks = st->pid.param.interval; | |
339 | ||
33e6820b | 340 | rc = wf_sensor_get(sensor_hd_temp, &temp); |
75722d39 BH |
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: Drive 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\n", (int)new_setpoint); | |
357 | ||
358 | if (st->setpoint == new_setpoint) | |
359 | return; | |
360 | st->setpoint = new_setpoint; | |
361 | readjust: | |
362 | if (fan_hd && wf_smu_failure_state == 0) { | |
33e6820b | 363 | rc = wf_control_set(fan_hd, st->setpoint); |
75722d39 BH |
364 | if (rc) { |
365 | printk(KERN_WARNING "windfarm: HD fan error %d\n", | |
366 | rc); | |
367 | wf_smu_failure_state |= FAILURE_FAN; | |
368 | } | |
369 | } | |
370 | } | |
371 | ||
372 | static void wf_smu_create_slots_fans(void) | |
373 | { | |
374 | struct wf_pid_param param = { | |
375 | .interval = 1, | |
376 | .history_len = 8, | |
377 | .gd = 0x00000000, | |
378 | .gp = 0x00000000, | |
379 | .gr = 0x00020000, | |
380 | .itarget = 0x00000000 | |
381 | }; | |
382 | ||
383 | /* Alloc & initialize state */ | |
384 | wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state), | |
385 | GFP_KERNEL); | |
386 | if (wf_smu_slots_fans == NULL) { | |
387 | printk(KERN_WARNING "windfarm: Memory allocation error" | |
388 | " max fan speed\n"); | |
389 | goto fail; | |
390 | } | |
391 | wf_smu_slots_fans->ticks = 1; | |
392 | ||
393 | /* Fill PID params */ | |
394 | param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN); | |
33e6820b BH |
395 | param.min = wf_control_get_min(fan_slots); |
396 | param.max = wf_control_get_max(fan_slots); | |
75722d39 BH |
397 | wf_pid_init(&wf_smu_slots_fans->pid, ¶m); |
398 | ||
399 | DBG("wf: Slots Fan control initialized.\n"); | |
400 | DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", | |
401 | FIX32TOPRINT(param.itarget), param.min, param.max); | |
402 | return; | |
403 | ||
404 | fail: | |
405 | if (fan_slots) | |
406 | wf_control_set_max(fan_slots); | |
407 | } | |
408 | ||
409 | static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st) | |
410 | { | |
411 | s32 new_setpoint, power; | |
412 | int rc; | |
413 | ||
414 | if (--st->ticks != 0) { | |
415 | if (wf_smu_readjust) | |
416 | goto readjust; | |
417 | return; | |
418 | } | |
419 | st->ticks = st->pid.param.interval; | |
420 | ||
33e6820b | 421 | rc = wf_sensor_get(sensor_slots_power, &power); |
75722d39 BH |
422 | if (rc) { |
423 | printk(KERN_WARNING "windfarm: Slots power sensor error %d\n", | |
424 | rc); | |
425 | wf_smu_failure_state |= FAILURE_SENSOR; | |
426 | return; | |
427 | } | |
428 | ||
429 | DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n", | |
430 | FIX32TOPRINT(power)); | |
431 | ||
432 | #if 0 /* Check what makes a good overtemp condition */ | |
433 | if (power > (st->pid.param.itarget + 0x50000)) | |
434 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
435 | #endif | |
436 | ||
437 | new_setpoint = wf_pid_run(&st->pid, power); | |
438 | ||
439 | DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); | |
440 | ||
441 | if (st->setpoint == new_setpoint) | |
442 | return; | |
443 | st->setpoint = new_setpoint; | |
444 | readjust: | |
445 | if (fan_slots && wf_smu_failure_state == 0) { | |
33e6820b | 446 | rc = wf_control_set(fan_slots, st->setpoint); |
75722d39 BH |
447 | if (rc) { |
448 | printk(KERN_WARNING "windfarm: Slots fan error %d\n", | |
449 | rc); | |
450 | wf_smu_failure_state |= FAILURE_FAN; | |
451 | } | |
452 | } | |
453 | } | |
454 | ||
455 | ||
75722d39 BH |
456 | /* |
457 | * ****** Setup / Init / Misc ... ****** | |
458 | * | |
459 | */ | |
460 | ||
461 | static void wf_smu_tick(void) | |
462 | { | |
463 | unsigned int last_failure = wf_smu_failure_state; | |
464 | unsigned int new_failure; | |
465 | ||
466 | if (!wf_smu_started) { | |
467 | DBG("wf: creating control loops !\n"); | |
468 | wf_smu_create_drive_fans(); | |
469 | wf_smu_create_slots_fans(); | |
470 | wf_smu_create_cpu_fans(); | |
4f256d56 | 471 | wf_smu_started = true; |
75722d39 BH |
472 | } |
473 | ||
474 | /* Skipping ticks */ | |
475 | if (wf_smu_skipping && --wf_smu_skipping) | |
476 | return; | |
477 | ||
478 | wf_smu_failure_state = 0; | |
479 | if (wf_smu_drive_fans) | |
480 | wf_smu_drive_fans_tick(wf_smu_drive_fans); | |
481 | if (wf_smu_slots_fans) | |
482 | wf_smu_slots_fans_tick(wf_smu_slots_fans); | |
483 | if (wf_smu_cpu_fans) | |
484 | wf_smu_cpu_fans_tick(wf_smu_cpu_fans); | |
485 | ||
486 | wf_smu_readjust = 0; | |
487 | new_failure = wf_smu_failure_state & ~last_failure; | |
488 | ||
489 | /* If entering failure mode, clamp cpufreq and ramp all | |
490 | * fans to full speed. | |
491 | */ | |
492 | if (wf_smu_failure_state && !last_failure) { | |
493 | if (cpufreq_clamp) | |
494 | wf_control_set_max(cpufreq_clamp); | |
495 | if (fan_cpu_main) | |
496 | wf_control_set_max(fan_cpu_main); | |
497 | if (fan_cpu_second) | |
498 | wf_control_set_max(fan_cpu_second); | |
499 | if (fan_cpu_third) | |
500 | wf_control_set_max(fan_cpu_third); | |
501 | if (fan_hd) | |
502 | wf_control_set_max(fan_hd); | |
503 | if (fan_slots) | |
504 | wf_control_set_max(fan_slots); | |
505 | } | |
506 | ||
507 | /* If leaving failure mode, unclamp cpufreq and readjust | |
508 | * all fans on next iteration | |
509 | */ | |
510 | if (!wf_smu_failure_state && last_failure) { | |
511 | if (cpufreq_clamp) | |
512 | wf_control_set_min(cpufreq_clamp); | |
513 | wf_smu_readjust = 1; | |
514 | } | |
515 | ||
516 | /* Overtemp condition detected, notify and start skipping a couple | |
517 | * ticks to let the temperature go down | |
518 | */ | |
519 | if (new_failure & FAILURE_OVERTEMP) { | |
520 | wf_set_overtemp(); | |
521 | wf_smu_skipping = 2; | |
4bb29711 | 522 | wf_smu_overtemp = true; |
75722d39 BH |
523 | } |
524 | ||
525 | /* We only clear the overtemp condition if overtemp is cleared | |
526 | * _and_ no other failure is present. Since a sensor error will | |
527 | * clear the overtemp condition (can't measure temperature) at | |
528 | * the control loop levels, but we don't want to keep it clear | |
529 | * here in this case | |
530 | */ | |
4bb29711 | 531 | if (!wf_smu_failure_state && wf_smu_overtemp) { |
75722d39 | 532 | wf_clear_overtemp(); |
4bb29711 AK |
533 | wf_smu_overtemp = false; |
534 | } | |
75722d39 BH |
535 | } |
536 | ||
537 | ||
538 | static void wf_smu_new_control(struct wf_control *ct) | |
539 | { | |
540 | if (wf_smu_all_controls_ok) | |
541 | return; | |
542 | ||
543 | if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) { | |
ac171c46 | 544 | if (wf_get_control(ct) == 0) |
75722d39 | 545 | fan_cpu_main = ct; |
75722d39 BH |
546 | } |
547 | ||
548 | if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) { | |
549 | if (wf_get_control(ct) == 0) | |
550 | fan_cpu_second = ct; | |
551 | } | |
552 | ||
553 | if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) { | |
554 | if (wf_get_control(ct) == 0) | |
555 | fan_cpu_third = ct; | |
556 | } | |
557 | ||
558 | if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { | |
559 | if (wf_get_control(ct) == 0) | |
560 | cpufreq_clamp = ct; | |
561 | } | |
562 | ||
563 | if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { | |
ac171c46 | 564 | if (wf_get_control(ct) == 0) |
75722d39 | 565 | fan_hd = ct; |
75722d39 BH |
566 | } |
567 | ||
568 | if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) { | |
ac171c46 | 569 | if (wf_get_control(ct) == 0) |
75722d39 | 570 | fan_slots = ct; |
75722d39 BH |
571 | } |
572 | ||
573 | if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd && | |
574 | fan_slots && cpufreq_clamp) | |
575 | wf_smu_all_controls_ok = 1; | |
576 | } | |
577 | ||
578 | static void wf_smu_new_sensor(struct wf_sensor *sr) | |
579 | { | |
580 | if (wf_smu_all_sensors_ok) | |
581 | return; | |
582 | ||
583 | if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { | |
ac171c46 | 584 | if (wf_get_sensor(sr) == 0) |
75722d39 | 585 | sensor_cpu_power = sr; |
75722d39 BH |
586 | } |
587 | ||
588 | if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { | |
ac171c46 | 589 | if (wf_get_sensor(sr) == 0) |
75722d39 | 590 | sensor_cpu_temp = sr; |
75722d39 BH |
591 | } |
592 | ||
593 | if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { | |
ac171c46 | 594 | if (wf_get_sensor(sr) == 0) |
75722d39 | 595 | sensor_hd_temp = sr; |
75722d39 BH |
596 | } |
597 | ||
598 | if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) { | |
ac171c46 | 599 | if (wf_get_sensor(sr) == 0) |
75722d39 | 600 | sensor_slots_power = sr; |
75722d39 BH |
601 | } |
602 | ||
603 | if (sensor_cpu_power && sensor_cpu_temp && | |
604 | sensor_hd_temp && sensor_slots_power) | |
605 | wf_smu_all_sensors_ok = 1; | |
606 | } | |
607 | ||
608 | ||
609 | static int wf_smu_notify(struct notifier_block *self, | |
610 | unsigned long event, void *data) | |
611 | { | |
612 | switch(event) { | |
613 | case WF_EVENT_NEW_CONTROL: | |
614 | DBG("wf: new control %s detected\n", | |
615 | ((struct wf_control *)data)->name); | |
616 | wf_smu_new_control(data); | |
617 | wf_smu_readjust = 1; | |
618 | break; | |
619 | case WF_EVENT_NEW_SENSOR: | |
620 | DBG("wf: new sensor %s detected\n", | |
621 | ((struct wf_sensor *)data)->name); | |
622 | wf_smu_new_sensor(data); | |
623 | break; | |
624 | case WF_EVENT_TICK: | |
625 | if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) | |
626 | wf_smu_tick(); | |
627 | } | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
632 | static struct notifier_block wf_smu_events = { | |
633 | .notifier_call = wf_smu_notify, | |
634 | }; | |
635 | ||
636 | static int wf_init_pm(void) | |
637 | { | |
638 | printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
10270613 | 643 | static int wf_smu_probe(struct platform_device *ddev) |
75722d39 | 644 | { |
75722d39 BH |
645 | wf_register_client(&wf_smu_events); |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
1da42fb6 | 650 | static int wf_smu_remove(struct platform_device *ddev) |
75722d39 BH |
651 | { |
652 | wf_unregister_client(&wf_smu_events); | |
653 | ||
654 | /* XXX We don't have yet a guarantee that our callback isn't | |
655 | * in progress when returning from wf_unregister_client, so | |
656 | * we add an arbitrary delay. I'll have to fix that in the core | |
657 | */ | |
658 | msleep(1000); | |
659 | ||
660 | /* Release all sensors */ | |
661 | /* One more crappy race: I don't think we have any guarantee here | |
662 | * that the attribute callback won't race with the sensor beeing | |
663 | * disposed of, and I'm not 100% certain what best way to deal | |
664 | * with that except by adding locks all over... I'll do that | |
665 | * eventually but heh, who ever rmmod this module anyway ? | |
666 | */ | |
ac171c46 | 667 | if (sensor_cpu_power) |
75722d39 | 668 | wf_put_sensor(sensor_cpu_power); |
ac171c46 | 669 | if (sensor_cpu_temp) |
75722d39 | 670 | wf_put_sensor(sensor_cpu_temp); |
ac171c46 | 671 | if (sensor_hd_temp) |
75722d39 | 672 | wf_put_sensor(sensor_hd_temp); |
ac171c46 | 673 | if (sensor_slots_power) |
75722d39 | 674 | wf_put_sensor(sensor_slots_power); |
75722d39 BH |
675 | |
676 | /* Release all controls */ | |
ac171c46 | 677 | if (fan_cpu_main) |
75722d39 | 678 | wf_put_control(fan_cpu_main); |
75722d39 BH |
679 | if (fan_cpu_second) |
680 | wf_put_control(fan_cpu_second); | |
681 | if (fan_cpu_third) | |
682 | wf_put_control(fan_cpu_third); | |
ac171c46 | 683 | if (fan_hd) |
75722d39 | 684 | wf_put_control(fan_hd); |
ac171c46 | 685 | if (fan_slots) |
75722d39 | 686 | wf_put_control(fan_slots); |
75722d39 BH |
687 | if (cpufreq_clamp) |
688 | wf_put_control(cpufreq_clamp); | |
689 | ||
690 | /* Destroy control loops state structures */ | |
ab30f78c JL |
691 | kfree(wf_smu_slots_fans); |
692 | kfree(wf_smu_drive_fans); | |
693 | kfree(wf_smu_cpu_fans); | |
75722d39 | 694 | |
75722d39 BH |
695 | return 0; |
696 | } | |
697 | ||
10270613 | 698 | static struct platform_driver wf_smu_driver = { |
75722d39 | 699 | .probe = wf_smu_probe, |
1da42fb6 | 700 | .remove = wf_smu_remove, |
10270613 BH |
701 | .driver = { |
702 | .name = "windfarm", | |
10270613 | 703 | }, |
75722d39 BH |
704 | }; |
705 | ||
706 | ||
707 | static int __init wf_smu_init(void) | |
708 | { | |
709 | int rc = -ENODEV; | |
710 | ||
71a157e8 | 711 | if (of_machine_is_compatible("PowerMac9,1")) |
75722d39 BH |
712 | rc = wf_init_pm(); |
713 | ||
714 | if (rc == 0) { | |
715 | #ifdef MODULE | |
716 | request_module("windfarm_smu_controls"); | |
717 | request_module("windfarm_smu_sensors"); | |
718 | request_module("windfarm_lm75_sensor"); | |
d31e8171 | 719 | request_module("windfarm_cpufreq_clamp"); |
75722d39 BH |
720 | |
721 | #endif /* MODULE */ | |
10270613 | 722 | platform_driver_register(&wf_smu_driver); |
75722d39 BH |
723 | } |
724 | ||
725 | return rc; | |
726 | } | |
727 | ||
728 | static void __exit wf_smu_exit(void) | |
729 | { | |
730 | ||
10270613 | 731 | platform_driver_unregister(&wf_smu_driver); |
75722d39 BH |
732 | } |
733 | ||
734 | ||
735 | module_init(wf_smu_init); | |
736 | module_exit(wf_smu_exit); | |
737 | ||
738 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
739 | MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); | |
740 | MODULE_LICENSE("GPL"); | |
741 | ||
23386fe5 | 742 | MODULE_ALIAS("platform:windfarm"); |