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 */ | |
78 | static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started; | |
4bb29711 | 79 | static bool wf_smu_overtemp; |
75722d39 BH |
80 | |
81 | /* Failure handling.. could be nicer */ | |
82 | #define FAILURE_FAN 0x01 | |
83 | #define FAILURE_SENSOR 0x02 | |
84 | #define FAILURE_OVERTEMP 0x04 | |
85 | ||
86 | static unsigned int wf_smu_failure_state; | |
87 | static int wf_smu_readjust, wf_smu_skipping; | |
88 | ||
89 | /* | |
90 | * ****** CPU Fans Control Loop ****** | |
91 | * | |
92 | */ | |
93 | ||
94 | ||
95 | #define WF_SMU_CPU_FANS_INTERVAL 1 | |
96 | #define WF_SMU_CPU_FANS_MAX_HISTORY 16 | |
97 | ||
98 | /* State data used by the cpu fans control loop | |
99 | */ | |
100 | struct wf_smu_cpu_fans_state { | |
101 | int ticks; | |
102 | s32 cpu_setpoint; | |
103 | struct wf_cpu_pid_state pid; | |
104 | }; | |
105 | ||
106 | static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; | |
107 | ||
108 | ||
109 | ||
110 | /* | |
111 | * ****** Drive Fan Control Loop ****** | |
112 | * | |
113 | */ | |
114 | ||
115 | struct wf_smu_drive_fans_state { | |
116 | int ticks; | |
117 | s32 setpoint; | |
118 | struct wf_pid_state pid; | |
119 | }; | |
120 | ||
121 | static struct wf_smu_drive_fans_state *wf_smu_drive_fans; | |
122 | ||
123 | /* | |
124 | * ****** Slots Fan Control Loop ****** | |
125 | * | |
126 | */ | |
127 | ||
128 | struct wf_smu_slots_fans_state { | |
129 | int ticks; | |
130 | s32 setpoint; | |
131 | struct wf_pid_state pid; | |
132 | }; | |
133 | ||
134 | static struct wf_smu_slots_fans_state *wf_smu_slots_fans; | |
135 | ||
136 | /* | |
137 | * ***** Implementation ***** | |
138 | * | |
139 | */ | |
140 | ||
141 | ||
142 | static void wf_smu_create_cpu_fans(void) | |
143 | { | |
144 | struct wf_cpu_pid_param pid_param; | |
018a3d1d | 145 | const struct smu_sdbp_header *hdr; |
75722d39 BH |
146 | struct smu_sdbp_cpupiddata *piddata; |
147 | struct smu_sdbp_fvt *fvt; | |
148 | s32 tmax, tdelta, maxpow, powadj; | |
149 | ||
150 | /* First, locate the PID params in SMU SBD */ | |
151 | hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); | |
152 | if (hdr == 0) { | |
153 | printk(KERN_WARNING "windfarm: CPU PID fan config not found " | |
154 | "max fan speed\n"); | |
155 | goto fail; | |
156 | } | |
157 | piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; | |
158 | ||
159 | /* Get the FVT params for operating point 0 (the only supported one | |
160 | * for now) in order to get tmax | |
161 | */ | |
162 | hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); | |
163 | if (hdr) { | |
164 | fvt = (struct smu_sdbp_fvt *)&hdr[1]; | |
165 | tmax = ((s32)fvt->maxtemp) << 16; | |
166 | } else | |
167 | tmax = 0x5e0000; /* 94 degree default */ | |
168 | ||
169 | /* Alloc & initialize state */ | |
170 | wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), | |
171 | GFP_KERNEL); | |
172 | if (wf_smu_cpu_fans == NULL) | |
173 | goto fail; | |
174 | wf_smu_cpu_fans->ticks = 1; | |
175 | ||
176 | /* Fill PID params */ | |
177 | pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; | |
178 | pid_param.history_len = piddata->history_len; | |
179 | if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { | |
180 | printk(KERN_WARNING "windfarm: History size overflow on " | |
181 | "CPU control loop (%d)\n", piddata->history_len); | |
182 | pid_param.history_len = WF_CPU_PID_MAX_HISTORY; | |
183 | } | |
184 | pid_param.gd = piddata->gd; | |
185 | pid_param.gp = piddata->gp; | |
186 | pid_param.gr = piddata->gr / pid_param.history_len; | |
187 | ||
188 | tdelta = ((s32)piddata->target_temp_delta) << 16; | |
189 | maxpow = ((s32)piddata->max_power) << 16; | |
190 | powadj = ((s32)piddata->power_adj) << 16; | |
191 | ||
192 | pid_param.tmax = tmax; | |
193 | pid_param.ttarget = tmax - tdelta; | |
194 | pid_param.pmaxadj = maxpow - powadj; | |
195 | ||
33e6820b BH |
196 | pid_param.min = wf_control_get_min(fan_cpu_main); |
197 | pid_param.max = wf_control_get_max(fan_cpu_main); | |
75722d39 BH |
198 | |
199 | wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); | |
200 | ||
201 | DBG("wf: CPU Fan control initialized.\n"); | |
202 | DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", | |
203 | FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), | |
204 | pid_param.min, pid_param.max); | |
205 | ||
206 | return; | |
207 | ||
208 | fail: | |
209 | printk(KERN_WARNING "windfarm: CPU fan config not found\n" | |
210 | "for this machine model, max fan speed\n"); | |
211 | ||
212 | if (cpufreq_clamp) | |
213 | wf_control_set_max(cpufreq_clamp); | |
214 | if (fan_cpu_main) | |
215 | wf_control_set_max(fan_cpu_main); | |
216 | } | |
217 | ||
218 | static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) | |
219 | { | |
220 | s32 new_setpoint, temp, power; | |
221 | int rc; | |
222 | ||
223 | if (--st->ticks != 0) { | |
224 | if (wf_smu_readjust) | |
225 | goto readjust; | |
226 | return; | |
227 | } | |
228 | st->ticks = WF_SMU_CPU_FANS_INTERVAL; | |
229 | ||
33e6820b | 230 | rc = wf_sensor_get(sensor_cpu_temp, &temp); |
75722d39 BH |
231 | if (rc) { |
232 | printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", | |
233 | rc); | |
234 | wf_smu_failure_state |= FAILURE_SENSOR; | |
235 | return; | |
236 | } | |
237 | ||
ca7d593e | 238 | rc = wf_sensor_get(sensor_cpu_power, &power); |
75722d39 BH |
239 | if (rc) { |
240 | printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", | |
241 | rc); | |
242 | wf_smu_failure_state |= FAILURE_SENSOR; | |
243 | return; | |
244 | } | |
245 | ||
246 | DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", | |
247 | FIX32TOPRINT(temp), FIX32TOPRINT(power)); | |
248 | ||
249 | #ifdef HACKED_OVERTEMP | |
250 | if (temp > 0x4a0000) | |
251 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
252 | #else | |
253 | if (temp > st->pid.param.tmax) | |
254 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
255 | #endif | |
256 | new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); | |
257 | ||
258 | DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); | |
259 | ||
260 | if (st->cpu_setpoint == new_setpoint) | |
261 | return; | |
262 | st->cpu_setpoint = new_setpoint; | |
263 | readjust: | |
264 | if (fan_cpu_main && wf_smu_failure_state == 0) { | |
33e6820b | 265 | rc = wf_control_set(fan_cpu_main, st->cpu_setpoint); |
75722d39 BH |
266 | if (rc) { |
267 | printk(KERN_WARNING "windfarm: CPU main fan" | |
268 | " error %d\n", rc); | |
269 | wf_smu_failure_state |= FAILURE_FAN; | |
270 | } | |
271 | } | |
272 | if (fan_cpu_second && wf_smu_failure_state == 0) { | |
33e6820b | 273 | rc = wf_control_set(fan_cpu_second, st->cpu_setpoint); |
75722d39 BH |
274 | if (rc) { |
275 | printk(KERN_WARNING "windfarm: CPU second fan" | |
276 | " error %d\n", rc); | |
277 | wf_smu_failure_state |= FAILURE_FAN; | |
278 | } | |
279 | } | |
280 | if (fan_cpu_third && wf_smu_failure_state == 0) { | |
33e6820b | 281 | rc = wf_control_set(fan_cpu_third, st->cpu_setpoint); |
75722d39 BH |
282 | if (rc) { |
283 | printk(KERN_WARNING "windfarm: CPU third fan" | |
284 | " error %d\n", rc); | |
285 | wf_smu_failure_state |= FAILURE_FAN; | |
286 | } | |
287 | } | |
288 | } | |
289 | ||
290 | static void wf_smu_create_drive_fans(void) | |
291 | { | |
292 | struct wf_pid_param param = { | |
293 | .interval = 5, | |
294 | .history_len = 2, | |
295 | .gd = 0x01e00000, | |
296 | .gp = 0x00500000, | |
297 | .gr = 0x00000000, | |
298 | .itarget = 0x00200000, | |
299 | }; | |
300 | ||
301 | /* Alloc & initialize state */ | |
302 | wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state), | |
303 | GFP_KERNEL); | |
304 | if (wf_smu_drive_fans == NULL) { | |
305 | printk(KERN_WARNING "windfarm: Memory allocation error" | |
306 | " max fan speed\n"); | |
307 | goto fail; | |
308 | } | |
309 | wf_smu_drive_fans->ticks = 1; | |
310 | ||
311 | /* Fill PID params */ | |
312 | param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN); | |
33e6820b BH |
313 | param.min = wf_control_get_min(fan_hd); |
314 | param.max = wf_control_get_max(fan_hd); | |
75722d39 BH |
315 | wf_pid_init(&wf_smu_drive_fans->pid, ¶m); |
316 | ||
317 | DBG("wf: Drive Fan control initialized.\n"); | |
318 | DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", | |
319 | FIX32TOPRINT(param.itarget), param.min, param.max); | |
320 | return; | |
321 | ||
322 | fail: | |
323 | if (fan_hd) | |
324 | wf_control_set_max(fan_hd); | |
325 | } | |
326 | ||
327 | static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st) | |
328 | { | |
329 | s32 new_setpoint, temp; | |
330 | int rc; | |
331 | ||
332 | if (--st->ticks != 0) { | |
333 | if (wf_smu_readjust) | |
334 | goto readjust; | |
335 | return; | |
336 | } | |
337 | st->ticks = st->pid.param.interval; | |
338 | ||
33e6820b | 339 | rc = wf_sensor_get(sensor_hd_temp, &temp); |
75722d39 BH |
340 | if (rc) { |
341 | printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", | |
342 | rc); | |
343 | wf_smu_failure_state |= FAILURE_SENSOR; | |
344 | return; | |
345 | } | |
346 | ||
347 | DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n", | |
348 | FIX32TOPRINT(temp)); | |
349 | ||
350 | if (temp > (st->pid.param.itarget + 0x50000)) | |
351 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
352 | ||
353 | new_setpoint = wf_pid_run(&st->pid, temp); | |
354 | ||
355 | DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); | |
356 | ||
357 | if (st->setpoint == new_setpoint) | |
358 | return; | |
359 | st->setpoint = new_setpoint; | |
360 | readjust: | |
361 | if (fan_hd && wf_smu_failure_state == 0) { | |
33e6820b | 362 | rc = wf_control_set(fan_hd, st->setpoint); |
75722d39 BH |
363 | if (rc) { |
364 | printk(KERN_WARNING "windfarm: HD fan error %d\n", | |
365 | rc); | |
366 | wf_smu_failure_state |= FAILURE_FAN; | |
367 | } | |
368 | } | |
369 | } | |
370 | ||
371 | static void wf_smu_create_slots_fans(void) | |
372 | { | |
373 | struct wf_pid_param param = { | |
374 | .interval = 1, | |
375 | .history_len = 8, | |
376 | .gd = 0x00000000, | |
377 | .gp = 0x00000000, | |
378 | .gr = 0x00020000, | |
379 | .itarget = 0x00000000 | |
380 | }; | |
381 | ||
382 | /* Alloc & initialize state */ | |
383 | wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state), | |
384 | GFP_KERNEL); | |
385 | if (wf_smu_slots_fans == NULL) { | |
386 | printk(KERN_WARNING "windfarm: Memory allocation error" | |
387 | " max fan speed\n"); | |
388 | goto fail; | |
389 | } | |
390 | wf_smu_slots_fans->ticks = 1; | |
391 | ||
392 | /* Fill PID params */ | |
393 | param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN); | |
33e6820b BH |
394 | param.min = wf_control_get_min(fan_slots); |
395 | param.max = wf_control_get_max(fan_slots); | |
75722d39 BH |
396 | wf_pid_init(&wf_smu_slots_fans->pid, ¶m); |
397 | ||
398 | DBG("wf: Slots Fan control initialized.\n"); | |
399 | DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", | |
400 | FIX32TOPRINT(param.itarget), param.min, param.max); | |
401 | return; | |
402 | ||
403 | fail: | |
404 | if (fan_slots) | |
405 | wf_control_set_max(fan_slots); | |
406 | } | |
407 | ||
408 | static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st) | |
409 | { | |
410 | s32 new_setpoint, power; | |
411 | int rc; | |
412 | ||
413 | if (--st->ticks != 0) { | |
414 | if (wf_smu_readjust) | |
415 | goto readjust; | |
416 | return; | |
417 | } | |
418 | st->ticks = st->pid.param.interval; | |
419 | ||
33e6820b | 420 | rc = wf_sensor_get(sensor_slots_power, &power); |
75722d39 BH |
421 | if (rc) { |
422 | printk(KERN_WARNING "windfarm: Slots power sensor error %d\n", | |
423 | rc); | |
424 | wf_smu_failure_state |= FAILURE_SENSOR; | |
425 | return; | |
426 | } | |
427 | ||
428 | DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n", | |
429 | FIX32TOPRINT(power)); | |
430 | ||
431 | #if 0 /* Check what makes a good overtemp condition */ | |
432 | if (power > (st->pid.param.itarget + 0x50000)) | |
433 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
434 | #endif | |
435 | ||
436 | new_setpoint = wf_pid_run(&st->pid, power); | |
437 | ||
438 | DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); | |
439 | ||
440 | if (st->setpoint == new_setpoint) | |
441 | return; | |
442 | st->setpoint = new_setpoint; | |
443 | readjust: | |
444 | if (fan_slots && wf_smu_failure_state == 0) { | |
33e6820b | 445 | rc = wf_control_set(fan_slots, st->setpoint); |
75722d39 BH |
446 | if (rc) { |
447 | printk(KERN_WARNING "windfarm: Slots fan error %d\n", | |
448 | rc); | |
449 | wf_smu_failure_state |= FAILURE_FAN; | |
450 | } | |
451 | } | |
452 | } | |
453 | ||
454 | ||
75722d39 BH |
455 | /* |
456 | * ****** Setup / Init / Misc ... ****** | |
457 | * | |
458 | */ | |
459 | ||
460 | static void wf_smu_tick(void) | |
461 | { | |
462 | unsigned int last_failure = wf_smu_failure_state; | |
463 | unsigned int new_failure; | |
464 | ||
465 | if (!wf_smu_started) { | |
466 | DBG("wf: creating control loops !\n"); | |
467 | wf_smu_create_drive_fans(); | |
468 | wf_smu_create_slots_fans(); | |
469 | wf_smu_create_cpu_fans(); | |
470 | wf_smu_started = 1; | |
471 | } | |
472 | ||
473 | /* Skipping ticks */ | |
474 | if (wf_smu_skipping && --wf_smu_skipping) | |
475 | return; | |
476 | ||
477 | wf_smu_failure_state = 0; | |
478 | if (wf_smu_drive_fans) | |
479 | wf_smu_drive_fans_tick(wf_smu_drive_fans); | |
480 | if (wf_smu_slots_fans) | |
481 | wf_smu_slots_fans_tick(wf_smu_slots_fans); | |
482 | if (wf_smu_cpu_fans) | |
483 | wf_smu_cpu_fans_tick(wf_smu_cpu_fans); | |
484 | ||
485 | wf_smu_readjust = 0; | |
486 | new_failure = wf_smu_failure_state & ~last_failure; | |
487 | ||
488 | /* If entering failure mode, clamp cpufreq and ramp all | |
489 | * fans to full speed. | |
490 | */ | |
491 | if (wf_smu_failure_state && !last_failure) { | |
492 | if (cpufreq_clamp) | |
493 | wf_control_set_max(cpufreq_clamp); | |
494 | if (fan_cpu_main) | |
495 | wf_control_set_max(fan_cpu_main); | |
496 | if (fan_cpu_second) | |
497 | wf_control_set_max(fan_cpu_second); | |
498 | if (fan_cpu_third) | |
499 | wf_control_set_max(fan_cpu_third); | |
500 | if (fan_hd) | |
501 | wf_control_set_max(fan_hd); | |
502 | if (fan_slots) | |
503 | wf_control_set_max(fan_slots); | |
504 | } | |
505 | ||
506 | /* If leaving failure mode, unclamp cpufreq and readjust | |
507 | * all fans on next iteration | |
508 | */ | |
509 | if (!wf_smu_failure_state && last_failure) { | |
510 | if (cpufreq_clamp) | |
511 | wf_control_set_min(cpufreq_clamp); | |
512 | wf_smu_readjust = 1; | |
513 | } | |
514 | ||
515 | /* Overtemp condition detected, notify and start skipping a couple | |
516 | * ticks to let the temperature go down | |
517 | */ | |
518 | if (new_failure & FAILURE_OVERTEMP) { | |
519 | wf_set_overtemp(); | |
520 | wf_smu_skipping = 2; | |
4bb29711 | 521 | wf_smu_overtemp = true; |
75722d39 BH |
522 | } |
523 | ||
524 | /* We only clear the overtemp condition if overtemp is cleared | |
525 | * _and_ no other failure is present. Since a sensor error will | |
526 | * clear the overtemp condition (can't measure temperature) at | |
527 | * the control loop levels, but we don't want to keep it clear | |
528 | * here in this case | |
529 | */ | |
4bb29711 | 530 | if (!wf_smu_failure_state && wf_smu_overtemp) { |
75722d39 | 531 | wf_clear_overtemp(); |
4bb29711 AK |
532 | wf_smu_overtemp = false; |
533 | } | |
75722d39 BH |
534 | } |
535 | ||
536 | ||
537 | static void wf_smu_new_control(struct wf_control *ct) | |
538 | { | |
539 | if (wf_smu_all_controls_ok) | |
540 | return; | |
541 | ||
542 | if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) { | |
ac171c46 | 543 | if (wf_get_control(ct) == 0) |
75722d39 | 544 | fan_cpu_main = ct; |
75722d39 BH |
545 | } |
546 | ||
547 | if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) { | |
548 | if (wf_get_control(ct) == 0) | |
549 | fan_cpu_second = ct; | |
550 | } | |
551 | ||
552 | if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) { | |
553 | if (wf_get_control(ct) == 0) | |
554 | fan_cpu_third = ct; | |
555 | } | |
556 | ||
557 | if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { | |
558 | if (wf_get_control(ct) == 0) | |
559 | cpufreq_clamp = ct; | |
560 | } | |
561 | ||
562 | if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { | |
ac171c46 | 563 | if (wf_get_control(ct) == 0) |
75722d39 | 564 | fan_hd = ct; |
75722d39 BH |
565 | } |
566 | ||
567 | if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) { | |
ac171c46 | 568 | if (wf_get_control(ct) == 0) |
75722d39 | 569 | fan_slots = ct; |
75722d39 BH |
570 | } |
571 | ||
572 | if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd && | |
573 | fan_slots && cpufreq_clamp) | |
574 | wf_smu_all_controls_ok = 1; | |
575 | } | |
576 | ||
577 | static void wf_smu_new_sensor(struct wf_sensor *sr) | |
578 | { | |
579 | if (wf_smu_all_sensors_ok) | |
580 | return; | |
581 | ||
582 | if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { | |
ac171c46 | 583 | if (wf_get_sensor(sr) == 0) |
75722d39 | 584 | sensor_cpu_power = sr; |
75722d39 BH |
585 | } |
586 | ||
587 | if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { | |
ac171c46 | 588 | if (wf_get_sensor(sr) == 0) |
75722d39 | 589 | sensor_cpu_temp = sr; |
75722d39 BH |
590 | } |
591 | ||
592 | if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { | |
ac171c46 | 593 | if (wf_get_sensor(sr) == 0) |
75722d39 | 594 | sensor_hd_temp = sr; |
75722d39 BH |
595 | } |
596 | ||
597 | if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) { | |
ac171c46 | 598 | if (wf_get_sensor(sr) == 0) |
75722d39 | 599 | sensor_slots_power = sr; |
75722d39 BH |
600 | } |
601 | ||
602 | if (sensor_cpu_power && sensor_cpu_temp && | |
603 | sensor_hd_temp && sensor_slots_power) | |
604 | wf_smu_all_sensors_ok = 1; | |
605 | } | |
606 | ||
607 | ||
608 | static int wf_smu_notify(struct notifier_block *self, | |
609 | unsigned long event, void *data) | |
610 | { | |
611 | switch(event) { | |
612 | case WF_EVENT_NEW_CONTROL: | |
613 | DBG("wf: new control %s detected\n", | |
614 | ((struct wf_control *)data)->name); | |
615 | wf_smu_new_control(data); | |
616 | wf_smu_readjust = 1; | |
617 | break; | |
618 | case WF_EVENT_NEW_SENSOR: | |
619 | DBG("wf: new sensor %s detected\n", | |
620 | ((struct wf_sensor *)data)->name); | |
621 | wf_smu_new_sensor(data); | |
622 | break; | |
623 | case WF_EVENT_TICK: | |
624 | if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) | |
625 | wf_smu_tick(); | |
626 | } | |
627 | ||
628 | return 0; | |
629 | } | |
630 | ||
631 | static struct notifier_block wf_smu_events = { | |
632 | .notifier_call = wf_smu_notify, | |
633 | }; | |
634 | ||
635 | static int wf_init_pm(void) | |
636 | { | |
637 | printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
10270613 | 642 | static int wf_smu_probe(struct platform_device *ddev) |
75722d39 | 643 | { |
75722d39 BH |
644 | wf_register_client(&wf_smu_events); |
645 | ||
646 | return 0; | |
647 | } | |
648 | ||
1da42fb6 | 649 | static int wf_smu_remove(struct platform_device *ddev) |
75722d39 BH |
650 | { |
651 | wf_unregister_client(&wf_smu_events); | |
652 | ||
653 | /* XXX We don't have yet a guarantee that our callback isn't | |
654 | * in progress when returning from wf_unregister_client, so | |
655 | * we add an arbitrary delay. I'll have to fix that in the core | |
656 | */ | |
657 | msleep(1000); | |
658 | ||
659 | /* Release all sensors */ | |
660 | /* One more crappy race: I don't think we have any guarantee here | |
661 | * that the attribute callback won't race with the sensor beeing | |
662 | * disposed of, and I'm not 100% certain what best way to deal | |
663 | * with that except by adding locks all over... I'll do that | |
664 | * eventually but heh, who ever rmmod this module anyway ? | |
665 | */ | |
ac171c46 | 666 | if (sensor_cpu_power) |
75722d39 | 667 | wf_put_sensor(sensor_cpu_power); |
ac171c46 | 668 | if (sensor_cpu_temp) |
75722d39 | 669 | wf_put_sensor(sensor_cpu_temp); |
ac171c46 | 670 | if (sensor_hd_temp) |
75722d39 | 671 | wf_put_sensor(sensor_hd_temp); |
ac171c46 | 672 | if (sensor_slots_power) |
75722d39 | 673 | wf_put_sensor(sensor_slots_power); |
75722d39 BH |
674 | |
675 | /* Release all controls */ | |
ac171c46 | 676 | if (fan_cpu_main) |
75722d39 | 677 | wf_put_control(fan_cpu_main); |
75722d39 BH |
678 | if (fan_cpu_second) |
679 | wf_put_control(fan_cpu_second); | |
680 | if (fan_cpu_third) | |
681 | wf_put_control(fan_cpu_third); | |
ac171c46 | 682 | if (fan_hd) |
75722d39 | 683 | wf_put_control(fan_hd); |
ac171c46 | 684 | if (fan_slots) |
75722d39 | 685 | wf_put_control(fan_slots); |
75722d39 BH |
686 | if (cpufreq_clamp) |
687 | wf_put_control(cpufreq_clamp); | |
688 | ||
689 | /* Destroy control loops state structures */ | |
ab30f78c JL |
690 | kfree(wf_smu_slots_fans); |
691 | kfree(wf_smu_drive_fans); | |
692 | kfree(wf_smu_cpu_fans); | |
75722d39 | 693 | |
75722d39 BH |
694 | return 0; |
695 | } | |
696 | ||
10270613 | 697 | static struct platform_driver wf_smu_driver = { |
75722d39 | 698 | .probe = wf_smu_probe, |
1da42fb6 | 699 | .remove = wf_smu_remove, |
10270613 BH |
700 | .driver = { |
701 | .name = "windfarm", | |
10270613 | 702 | }, |
75722d39 BH |
703 | }; |
704 | ||
705 | ||
706 | static int __init wf_smu_init(void) | |
707 | { | |
708 | int rc = -ENODEV; | |
709 | ||
71a157e8 | 710 | if (of_machine_is_compatible("PowerMac9,1")) |
75722d39 BH |
711 | rc = wf_init_pm(); |
712 | ||
713 | if (rc == 0) { | |
714 | #ifdef MODULE | |
715 | request_module("windfarm_smu_controls"); | |
716 | request_module("windfarm_smu_sensors"); | |
717 | request_module("windfarm_lm75_sensor"); | |
d31e8171 | 718 | request_module("windfarm_cpufreq_clamp"); |
75722d39 BH |
719 | |
720 | #endif /* MODULE */ | |
10270613 | 721 | platform_driver_register(&wf_smu_driver); |
75722d39 BH |
722 | } |
723 | ||
724 | return rc; | |
725 | } | |
726 | ||
727 | static void __exit wf_smu_exit(void) | |
728 | { | |
729 | ||
10270613 | 730 | platform_driver_unregister(&wf_smu_driver); |
75722d39 BH |
731 | } |
732 | ||
733 | ||
734 | module_init(wf_smu_init); | |
735 | module_exit(wf_smu_exit); | |
736 | ||
737 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
738 | MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); | |
739 | MODULE_LICENSE("GPL"); | |
740 | ||
23386fe5 | 741 | MODULE_ALIAS("platform:windfarm"); |