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75722d39 BH |
1 | /* |
2 | * Windfarm PowerMac thermal control. iMac G5 | |
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 | * PowerMac8,1 and PowerMac8,2 | |
17 | * =========================== | |
18 | * | |
19 | * System Fans control loop. Different based on models. In addition to the | |
20 | * usual PID algorithm, the control loop gets 2 additional pairs of linear | |
21 | * scaling factors (scale/offsets) expressed as 4.12 fixed point values | |
22 | * signed offset, unsigned scale) | |
23 | * | |
24 | * The targets are modified such as: | |
25 | * - the linked control (second control) gets the target value as-is | |
26 | * (typically the drive fan) | |
27 | * - the main control (first control) gets the target value scaled with | |
28 | * the first pair of factors, and is then modified as below | |
943ffb58 | 29 | * - the value of the target of the CPU Fan control loop is retrieved, |
75722d39 BH |
30 | * scaled with the second pair of factors, and the max of that and |
31 | * the scaled target is applied to the main control. | |
32 | * | |
33 | * # model_id: 2 | |
34 | * controls : system-fan, drive-bay-fan | |
35 | * sensors : hd-temp | |
36 | * PID params : G_d = 0x15400000 | |
37 | * G_p = 0x00200000 | |
38 | * G_r = 0x000002fd | |
39 | * History = 2 entries | |
40 | * Input target = 0x3a0000 | |
41 | * Interval = 5s | |
42 | * linear-factors : offset = 0xff38 scale = 0x0ccd | |
43 | * offset = 0x0208 scale = 0x07ae | |
44 | * | |
45 | * # model_id: 3 | |
46 | * controls : system-fan, drive-bay-fan | |
47 | * sensors : hd-temp | |
48 | * PID params : G_d = 0x08e00000 | |
49 | * G_p = 0x00566666 | |
50 | * G_r = 0x0000072b | |
51 | * History = 2 entries | |
52 | * Input target = 0x350000 | |
53 | * Interval = 5s | |
54 | * linear-factors : offset = 0xff38 scale = 0x0ccd | |
55 | * offset = 0x0000 scale = 0x0000 | |
56 | * | |
57 | * # model_id: 5 | |
58 | * controls : system-fan | |
59 | * sensors : hd-temp | |
60 | * PID params : G_d = 0x15400000 | |
61 | * G_p = 0x00233333 | |
62 | * G_r = 0x000002fd | |
63 | * History = 2 entries | |
64 | * Input target = 0x3a0000 | |
65 | * Interval = 5s | |
66 | * linear-factors : offset = 0x0000 scale = 0x1000 | |
67 | * offset = 0x0091 scale = 0x0bae | |
68 | * | |
69 | * CPU Fan control loop. The loop is identical for all models. it | |
70 | * has an additional pair of scaling factor. This is used to scale the | |
71 | * systems fan control loop target result (the one before it gets scaled | |
72 | * by the System Fans control loop itself). Then, the max value of the | |
73 | * calculated target value and system fan value is sent to the fans | |
74 | * | |
75 | * controls : cpu-fan | |
76 | * sensors : cpu-temp cpu-power | |
77 | * PID params : From SMU sdb partition | |
78 | * linear-factors : offset = 0xfb50 scale = 0x1000 | |
79 | * | |
80 | * CPU Slew control loop. Not implemented. The cpufreq driver in linux is | |
81 | * completely separate for now, though we could find a way to link it, either | |
82 | * as a client reacting to overtemp notifications, or directling monitoring | |
83 | * the CPU temperature | |
84 | * | |
85 | * WARNING ! The CPU control loop requires the CPU tmax for the current | |
86 | * operating point. However, we currently are completely separated from | |
87 | * the cpufreq driver and thus do not know what the current operating | |
88 | * point is. Fortunately, we also do not have any hardware supporting anything | |
89 | * but operating point 0 at the moment, thus we just peek that value directly | |
90 | * from the SDB partition. If we ever end up with actually slewing the system | |
91 | * clock and thus changing operating points, we'll have to find a way to | |
92 | * communicate with the CPU freq driver; | |
93 | * | |
94 | */ | |
95 | ||
96 | #include <linux/types.h> | |
97 | #include <linux/errno.h> | |
98 | #include <linux/kernel.h> | |
99 | #include <linux/delay.h> | |
100 | #include <linux/slab.h> | |
101 | #include <linux/init.h> | |
102 | #include <linux/spinlock.h> | |
103 | #include <linux/wait.h> | |
104 | #include <linux/kmod.h> | |
105 | #include <linux/device.h> | |
106 | #include <linux/platform_device.h> | |
107 | #include <asm/prom.h> | |
108 | #include <asm/machdep.h> | |
109 | #include <asm/io.h> | |
110 | #include <asm/system.h> | |
111 | #include <asm/sections.h> | |
112 | #include <asm/smu.h> | |
113 | ||
114 | #include "windfarm.h" | |
115 | #include "windfarm_pid.h" | |
116 | ||
117 | #define VERSION "0.4" | |
118 | ||
119 | #undef DEBUG | |
120 | ||
121 | #ifdef DEBUG | |
122 | #define DBG(args...) printk(args) | |
123 | #else | |
124 | #define DBG(args...) do { } while(0) | |
125 | #endif | |
126 | ||
127 | /* define this to force CPU overtemp to 74 degree, useful for testing | |
128 | * the overtemp code | |
129 | */ | |
130 | #undef HACKED_OVERTEMP | |
131 | ||
132 | static int wf_smu_mach_model; /* machine model id */ | |
133 | ||
134 | static struct device *wf_smu_dev; | |
135 | ||
136 | /* Controls & sensors */ | |
137 | static struct wf_sensor *sensor_cpu_power; | |
138 | static struct wf_sensor *sensor_cpu_temp; | |
139 | static struct wf_sensor *sensor_hd_temp; | |
140 | static struct wf_control *fan_cpu_main; | |
141 | static struct wf_control *fan_hd; | |
142 | static struct wf_control *fan_system; | |
143 | static struct wf_control *cpufreq_clamp; | |
144 | ||
145 | /* Set to kick the control loop into life */ | |
146 | static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started; | |
147 | ||
148 | /* Failure handling.. could be nicer */ | |
149 | #define FAILURE_FAN 0x01 | |
150 | #define FAILURE_SENSOR 0x02 | |
151 | #define FAILURE_OVERTEMP 0x04 | |
152 | ||
153 | static unsigned int wf_smu_failure_state; | |
154 | static int wf_smu_readjust, wf_smu_skipping; | |
155 | ||
156 | /* | |
157 | * ****** System Fans Control Loop ****** | |
158 | * | |
159 | */ | |
160 | ||
161 | /* Parameters for the System Fans control loop. Parameters | |
162 | * not in this table such as interval, history size, ... | |
163 | * are common to all versions and thus hard coded for now. | |
164 | */ | |
165 | struct wf_smu_sys_fans_param { | |
166 | int model_id; | |
167 | s32 itarget; | |
168 | s32 gd, gp, gr; | |
169 | ||
170 | s16 offset0; | |
171 | u16 scale0; | |
172 | s16 offset1; | |
173 | u16 scale1; | |
174 | }; | |
175 | ||
176 | #define WF_SMU_SYS_FANS_INTERVAL 5 | |
177 | #define WF_SMU_SYS_FANS_HISTORY_SIZE 2 | |
178 | ||
179 | /* State data used by the system fans control loop | |
180 | */ | |
181 | struct wf_smu_sys_fans_state { | |
182 | int ticks; | |
183 | s32 sys_setpoint; | |
184 | s32 hd_setpoint; | |
185 | s16 offset0; | |
186 | u16 scale0; | |
187 | s16 offset1; | |
188 | u16 scale1; | |
189 | struct wf_pid_state pid; | |
190 | }; | |
191 | ||
192 | /* | |
193 | * Configs for SMU Sytem Fan control loop | |
194 | */ | |
195 | static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = { | |
196 | /* Model ID 2 */ | |
197 | { | |
198 | .model_id = 2, | |
199 | .itarget = 0x3a0000, | |
200 | .gd = 0x15400000, | |
201 | .gp = 0x00200000, | |
202 | .gr = 0x000002fd, | |
203 | .offset0 = 0xff38, | |
204 | .scale0 = 0x0ccd, | |
205 | .offset1 = 0x0208, | |
206 | .scale1 = 0x07ae, | |
207 | }, | |
208 | /* Model ID 3 */ | |
209 | { | |
326743ea | 210 | .model_id = 3, |
75722d39 BH |
211 | .itarget = 0x350000, |
212 | .gd = 0x08e00000, | |
213 | .gp = 0x00566666, | |
214 | .gr = 0x0000072b, | |
215 | .offset0 = 0xff38, | |
216 | .scale0 = 0x0ccd, | |
217 | .offset1 = 0x0000, | |
218 | .scale1 = 0x0000, | |
219 | }, | |
220 | /* Model ID 5 */ | |
221 | { | |
326743ea | 222 | .model_id = 5, |
75722d39 BH |
223 | .itarget = 0x3a0000, |
224 | .gd = 0x15400000, | |
225 | .gp = 0x00233333, | |
226 | .gr = 0x000002fd, | |
227 | .offset0 = 0x0000, | |
228 | .scale0 = 0x1000, | |
229 | .offset1 = 0x0091, | |
230 | .scale1 = 0x0bae, | |
231 | }, | |
232 | }; | |
233 | #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params) | |
234 | ||
235 | static struct wf_smu_sys_fans_state *wf_smu_sys_fans; | |
236 | ||
237 | /* | |
238 | * ****** CPU Fans Control Loop ****** | |
239 | * | |
240 | */ | |
241 | ||
242 | ||
243 | #define WF_SMU_CPU_FANS_INTERVAL 1 | |
244 | #define WF_SMU_CPU_FANS_MAX_HISTORY 16 | |
245 | #define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000 | |
246 | #define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50 | |
247 | ||
248 | /* State data used by the cpu fans control loop | |
249 | */ | |
250 | struct wf_smu_cpu_fans_state { | |
251 | int ticks; | |
252 | s32 cpu_setpoint; | |
253 | s32 scale; | |
254 | s32 offset; | |
255 | struct wf_cpu_pid_state pid; | |
256 | }; | |
257 | ||
258 | static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; | |
259 | ||
260 | ||
261 | ||
262 | /* | |
263 | * ***** Implementation ***** | |
264 | * | |
265 | */ | |
266 | ||
267 | static void wf_smu_create_sys_fans(void) | |
268 | { | |
269 | struct wf_smu_sys_fans_param *param = NULL; | |
270 | struct wf_pid_param pid_param; | |
271 | int i; | |
272 | ||
273 | /* First, locate the params for this model */ | |
274 | for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++) | |
275 | if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) { | |
276 | param = &wf_smu_sys_all_params[i]; | |
277 | break; | |
278 | } | |
279 | ||
280 | /* No params found, put fans to max */ | |
281 | if (param == NULL) { | |
282 | printk(KERN_WARNING "windfarm: System fan config not found " | |
283 | "for this machine model, max fan speed\n"); | |
284 | goto fail; | |
285 | } | |
286 | ||
287 | /* Alloc & initialize state */ | |
288 | wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state), | |
289 | GFP_KERNEL); | |
290 | if (wf_smu_sys_fans == NULL) { | |
291 | printk(KERN_WARNING "windfarm: Memory allocation error" | |
292 | " max fan speed\n"); | |
293 | goto fail; | |
294 | } | |
295 | wf_smu_sys_fans->ticks = 1; | |
296 | wf_smu_sys_fans->scale0 = param->scale0; | |
297 | wf_smu_sys_fans->offset0 = param->offset0; | |
298 | wf_smu_sys_fans->scale1 = param->scale1; | |
299 | wf_smu_sys_fans->offset1 = param->offset1; | |
300 | ||
301 | /* Fill PID params */ | |
302 | pid_param.gd = param->gd; | |
303 | pid_param.gp = param->gp; | |
304 | pid_param.gr = param->gr; | |
305 | pid_param.interval = WF_SMU_SYS_FANS_INTERVAL; | |
306 | pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE; | |
307 | pid_param.itarget = param->itarget; | |
308 | pid_param.min = fan_system->ops->get_min(fan_system); | |
309 | pid_param.max = fan_system->ops->get_max(fan_system); | |
310 | if (fan_hd) { | |
311 | pid_param.min = | |
312 | max(pid_param.min,fan_hd->ops->get_min(fan_hd)); | |
313 | pid_param.max = | |
314 | min(pid_param.max,fan_hd->ops->get_max(fan_hd)); | |
315 | } | |
316 | wf_pid_init(&wf_smu_sys_fans->pid, &pid_param); | |
317 | ||
318 | DBG("wf: System Fan control initialized.\n"); | |
319 | DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", | |
320 | FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max); | |
321 | return; | |
322 | ||
323 | fail: | |
324 | ||
325 | if (fan_system) | |
326 | wf_control_set_max(fan_system); | |
327 | if (fan_hd) | |
328 | wf_control_set_max(fan_hd); | |
329 | } | |
330 | ||
331 | static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st) | |
332 | { | |
333 | s32 new_setpoint, temp, scaled, cputarget; | |
334 | int rc; | |
335 | ||
336 | if (--st->ticks != 0) { | |
337 | if (wf_smu_readjust) | |
338 | goto readjust; | |
339 | return; | |
340 | } | |
341 | st->ticks = WF_SMU_SYS_FANS_INTERVAL; | |
342 | ||
343 | rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp); | |
344 | if (rc) { | |
345 | printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", | |
346 | rc); | |
347 | wf_smu_failure_state |= FAILURE_SENSOR; | |
348 | return; | |
349 | } | |
350 | ||
351 | DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n", | |
352 | FIX32TOPRINT(temp)); | |
353 | ||
354 | if (temp > (st->pid.param.itarget + 0x50000)) | |
355 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
356 | ||
357 | new_setpoint = wf_pid_run(&st->pid, temp); | |
358 | ||
359 | DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); | |
360 | ||
361 | scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0; | |
362 | ||
363 | DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled); | |
364 | ||
365 | cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0; | |
366 | cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1; | |
367 | scaled = max(scaled, cputarget); | |
368 | scaled = max(scaled, st->pid.param.min); | |
369 | scaled = min(scaled, st->pid.param.max); | |
370 | ||
371 | DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled); | |
372 | ||
373 | if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint) | |
374 | return; | |
375 | st->sys_setpoint = scaled; | |
376 | st->hd_setpoint = new_setpoint; | |
377 | readjust: | |
378 | if (fan_system && wf_smu_failure_state == 0) { | |
379 | rc = fan_system->ops->set_value(fan_system, st->sys_setpoint); | |
380 | if (rc) { | |
381 | printk(KERN_WARNING "windfarm: Sys fan error %d\n", | |
382 | rc); | |
383 | wf_smu_failure_state |= FAILURE_FAN; | |
384 | } | |
385 | } | |
386 | if (fan_hd && wf_smu_failure_state == 0) { | |
387 | rc = fan_hd->ops->set_value(fan_hd, st->hd_setpoint); | |
388 | if (rc) { | |
389 | printk(KERN_WARNING "windfarm: HD fan error %d\n", | |
390 | rc); | |
391 | wf_smu_failure_state |= FAILURE_FAN; | |
392 | } | |
393 | } | |
394 | } | |
395 | ||
396 | static void wf_smu_create_cpu_fans(void) | |
397 | { | |
398 | struct wf_cpu_pid_param pid_param; | |
399 | struct smu_sdbp_header *hdr; | |
400 | struct smu_sdbp_cpupiddata *piddata; | |
401 | struct smu_sdbp_fvt *fvt; | |
402 | s32 tmax, tdelta, maxpow, powadj; | |
403 | ||
404 | /* First, locate the PID params in SMU SBD */ | |
405 | hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); | |
406 | if (hdr == 0) { | |
407 | printk(KERN_WARNING "windfarm: CPU PID fan config not found " | |
408 | "max fan speed\n"); | |
409 | goto fail; | |
410 | } | |
411 | piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; | |
412 | ||
413 | /* Get the FVT params for operating point 0 (the only supported one | |
414 | * for now) in order to get tmax | |
415 | */ | |
416 | hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); | |
417 | if (hdr) { | |
418 | fvt = (struct smu_sdbp_fvt *)&hdr[1]; | |
419 | tmax = ((s32)fvt->maxtemp) << 16; | |
420 | } else | |
421 | tmax = 0x5e0000; /* 94 degree default */ | |
422 | ||
423 | /* Alloc & initialize state */ | |
424 | wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), | |
425 | GFP_KERNEL); | |
426 | if (wf_smu_cpu_fans == NULL) | |
427 | goto fail; | |
428 | wf_smu_cpu_fans->ticks = 1; | |
429 | ||
430 | wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE; | |
431 | wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET; | |
432 | ||
433 | /* Fill PID params */ | |
434 | pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; | |
435 | pid_param.history_len = piddata->history_len; | |
436 | if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { | |
437 | printk(KERN_WARNING "windfarm: History size overflow on " | |
438 | "CPU control loop (%d)\n", piddata->history_len); | |
439 | pid_param.history_len = WF_CPU_PID_MAX_HISTORY; | |
440 | } | |
441 | pid_param.gd = piddata->gd; | |
442 | pid_param.gp = piddata->gp; | |
443 | pid_param.gr = piddata->gr / pid_param.history_len; | |
444 | ||
445 | tdelta = ((s32)piddata->target_temp_delta) << 16; | |
446 | maxpow = ((s32)piddata->max_power) << 16; | |
447 | powadj = ((s32)piddata->power_adj) << 16; | |
448 | ||
449 | pid_param.tmax = tmax; | |
450 | pid_param.ttarget = tmax - tdelta; | |
451 | pid_param.pmaxadj = maxpow - powadj; | |
452 | ||
453 | pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main); | |
454 | pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main); | |
455 | ||
456 | wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); | |
457 | ||
458 | DBG("wf: CPU Fan control initialized.\n"); | |
459 | DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", | |
460 | FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), | |
461 | pid_param.min, pid_param.max); | |
462 | ||
463 | return; | |
464 | ||
465 | fail: | |
466 | printk(KERN_WARNING "windfarm: CPU fan config not found\n" | |
467 | "for this machine model, max fan speed\n"); | |
468 | ||
469 | if (cpufreq_clamp) | |
470 | wf_control_set_max(cpufreq_clamp); | |
471 | if (fan_cpu_main) | |
472 | wf_control_set_max(fan_cpu_main); | |
473 | } | |
474 | ||
475 | static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) | |
476 | { | |
477 | s32 new_setpoint, temp, power, systarget; | |
478 | int rc; | |
479 | ||
480 | if (--st->ticks != 0) { | |
481 | if (wf_smu_readjust) | |
482 | goto readjust; | |
483 | return; | |
484 | } | |
485 | st->ticks = WF_SMU_CPU_FANS_INTERVAL; | |
486 | ||
487 | rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); | |
488 | if (rc) { | |
489 | printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", | |
490 | rc); | |
491 | wf_smu_failure_state |= FAILURE_SENSOR; | |
492 | return; | |
493 | } | |
494 | ||
495 | rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); | |
496 | if (rc) { | |
497 | printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", | |
498 | rc); | |
499 | wf_smu_failure_state |= FAILURE_SENSOR; | |
500 | return; | |
501 | } | |
502 | ||
503 | DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", | |
504 | FIX32TOPRINT(temp), FIX32TOPRINT(power)); | |
505 | ||
506 | #ifdef HACKED_OVERTEMP | |
507 | if (temp > 0x4a0000) | |
508 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
509 | #else | |
510 | if (temp > st->pid.param.tmax) | |
511 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
512 | #endif | |
513 | new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); | |
514 | ||
515 | DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); | |
516 | ||
517 | systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0; | |
518 | systarget = ((((s64)systarget) * (s64)st->scale) >> 12) | |
519 | + st->offset; | |
520 | new_setpoint = max(new_setpoint, systarget); | |
521 | new_setpoint = max(new_setpoint, st->pid.param.min); | |
522 | new_setpoint = min(new_setpoint, st->pid.param.max); | |
523 | ||
524 | DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint); | |
525 | ||
526 | if (st->cpu_setpoint == new_setpoint) | |
527 | return; | |
528 | st->cpu_setpoint = new_setpoint; | |
529 | readjust: | |
530 | if (fan_cpu_main && wf_smu_failure_state == 0) { | |
531 | rc = fan_cpu_main->ops->set_value(fan_cpu_main, | |
532 | st->cpu_setpoint); | |
533 | if (rc) { | |
534 | printk(KERN_WARNING "windfarm: CPU main fan" | |
535 | " error %d\n", rc); | |
536 | wf_smu_failure_state |= FAILURE_FAN; | |
537 | } | |
538 | } | |
539 | } | |
540 | ||
75722d39 BH |
541 | /* |
542 | * ****** Setup / Init / Misc ... ****** | |
543 | * | |
544 | */ | |
545 | ||
546 | static void wf_smu_tick(void) | |
547 | { | |
548 | unsigned int last_failure = wf_smu_failure_state; | |
549 | unsigned int new_failure; | |
550 | ||
551 | if (!wf_smu_started) { | |
552 | DBG("wf: creating control loops !\n"); | |
553 | wf_smu_create_sys_fans(); | |
554 | wf_smu_create_cpu_fans(); | |
555 | wf_smu_started = 1; | |
556 | } | |
557 | ||
558 | /* Skipping ticks */ | |
559 | if (wf_smu_skipping && --wf_smu_skipping) | |
560 | return; | |
561 | ||
562 | wf_smu_failure_state = 0; | |
563 | if (wf_smu_sys_fans) | |
564 | wf_smu_sys_fans_tick(wf_smu_sys_fans); | |
565 | if (wf_smu_cpu_fans) | |
566 | wf_smu_cpu_fans_tick(wf_smu_cpu_fans); | |
567 | ||
568 | wf_smu_readjust = 0; | |
569 | new_failure = wf_smu_failure_state & ~last_failure; | |
570 | ||
571 | /* If entering failure mode, clamp cpufreq and ramp all | |
572 | * fans to full speed. | |
573 | */ | |
574 | if (wf_smu_failure_state && !last_failure) { | |
575 | if (cpufreq_clamp) | |
576 | wf_control_set_max(cpufreq_clamp); | |
577 | if (fan_system) | |
578 | wf_control_set_max(fan_system); | |
579 | if (fan_cpu_main) | |
580 | wf_control_set_max(fan_cpu_main); | |
581 | if (fan_hd) | |
582 | wf_control_set_max(fan_hd); | |
583 | } | |
584 | ||
585 | /* If leaving failure mode, unclamp cpufreq and readjust | |
586 | * all fans on next iteration | |
587 | */ | |
588 | if (!wf_smu_failure_state && last_failure) { | |
589 | if (cpufreq_clamp) | |
590 | wf_control_set_min(cpufreq_clamp); | |
591 | wf_smu_readjust = 1; | |
592 | } | |
593 | ||
594 | /* Overtemp condition detected, notify and start skipping a couple | |
595 | * ticks to let the temperature go down | |
596 | */ | |
597 | if (new_failure & FAILURE_OVERTEMP) { | |
598 | wf_set_overtemp(); | |
599 | wf_smu_skipping = 2; | |
600 | } | |
601 | ||
602 | /* We only clear the overtemp condition if overtemp is cleared | |
603 | * _and_ no other failure is present. Since a sensor error will | |
604 | * clear the overtemp condition (can't measure temperature) at | |
605 | * the control loop levels, but we don't want to keep it clear | |
606 | * here in this case | |
607 | */ | |
608 | if (new_failure == 0 && last_failure & FAILURE_OVERTEMP) | |
609 | wf_clear_overtemp(); | |
610 | } | |
611 | ||
612 | static void wf_smu_new_control(struct wf_control *ct) | |
613 | { | |
614 | if (wf_smu_all_controls_ok) | |
615 | return; | |
616 | ||
617 | if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) { | |
ac171c46 | 618 | if (wf_get_control(ct) == 0) |
75722d39 | 619 | fan_cpu_main = ct; |
75722d39 BH |
620 | } |
621 | ||
622 | if (fan_system == NULL && !strcmp(ct->name, "system-fan")) { | |
ac171c46 | 623 | if (wf_get_control(ct) == 0) |
75722d39 | 624 | fan_system = ct; |
75722d39 BH |
625 | } |
626 | ||
627 | if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { | |
628 | if (wf_get_control(ct) == 0) | |
629 | cpufreq_clamp = ct; | |
630 | } | |
631 | ||
632 | /* Darwin property list says the HD fan is only for model ID | |
633 | * 0, 1, 2 and 3 | |
634 | */ | |
635 | ||
636 | if (wf_smu_mach_model > 3) { | |
637 | if (fan_system && fan_cpu_main && cpufreq_clamp) | |
638 | wf_smu_all_controls_ok = 1; | |
639 | return; | |
640 | } | |
641 | ||
642 | if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { | |
ac171c46 | 643 | if (wf_get_control(ct) == 0) |
75722d39 | 644 | fan_hd = ct; |
75722d39 BH |
645 | } |
646 | ||
647 | if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp) | |
648 | wf_smu_all_controls_ok = 1; | |
649 | } | |
650 | ||
651 | static void wf_smu_new_sensor(struct wf_sensor *sr) | |
652 | { | |
653 | if (wf_smu_all_sensors_ok) | |
654 | return; | |
655 | ||
656 | if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { | |
ac171c46 | 657 | if (wf_get_sensor(sr) == 0) |
75722d39 | 658 | sensor_cpu_power = sr; |
75722d39 BH |
659 | } |
660 | ||
661 | if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { | |
ac171c46 | 662 | if (wf_get_sensor(sr) == 0) |
75722d39 | 663 | sensor_cpu_temp = sr; |
75722d39 BH |
664 | } |
665 | ||
666 | if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { | |
ac171c46 | 667 | if (wf_get_sensor(sr) == 0) |
75722d39 | 668 | sensor_hd_temp = sr; |
75722d39 BH |
669 | } |
670 | ||
671 | if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp) | |
672 | wf_smu_all_sensors_ok = 1; | |
673 | } | |
674 | ||
675 | ||
676 | static int wf_smu_notify(struct notifier_block *self, | |
677 | unsigned long event, void *data) | |
678 | { | |
679 | switch(event) { | |
680 | case WF_EVENT_NEW_CONTROL: | |
681 | DBG("wf: new control %s detected\n", | |
682 | ((struct wf_control *)data)->name); | |
683 | wf_smu_new_control(data); | |
684 | wf_smu_readjust = 1; | |
685 | break; | |
686 | case WF_EVENT_NEW_SENSOR: | |
687 | DBG("wf: new sensor %s detected\n", | |
688 | ((struct wf_sensor *)data)->name); | |
689 | wf_smu_new_sensor(data); | |
690 | break; | |
691 | case WF_EVENT_TICK: | |
692 | if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) | |
693 | wf_smu_tick(); | |
694 | } | |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
699 | static struct notifier_block wf_smu_events = { | |
700 | .notifier_call = wf_smu_notify, | |
701 | }; | |
702 | ||
703 | static int wf_init_pm(void) | |
704 | { | |
705 | struct smu_sdbp_header *hdr; | |
706 | ||
707 | hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); | |
708 | if (hdr != 0) { | |
709 | struct smu_sdbp_sensortree *st = | |
710 | (struct smu_sdbp_sensortree *)&hdr[1]; | |
711 | wf_smu_mach_model = st->model_id; | |
712 | } | |
713 | ||
714 | printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n", | |
715 | wf_smu_mach_model); | |
716 | ||
717 | return 0; | |
718 | } | |
719 | ||
720 | static int wf_smu_probe(struct device *ddev) | |
721 | { | |
722 | wf_smu_dev = ddev; | |
723 | ||
724 | wf_register_client(&wf_smu_events); | |
725 | ||
726 | return 0; | |
727 | } | |
728 | ||
729 | static int wf_smu_remove(struct device *ddev) | |
730 | { | |
731 | wf_unregister_client(&wf_smu_events); | |
732 | ||
733 | /* XXX We don't have yet a guarantee that our callback isn't | |
734 | * in progress when returning from wf_unregister_client, so | |
735 | * we add an arbitrary delay. I'll have to fix that in the core | |
736 | */ | |
737 | msleep(1000); | |
738 | ||
739 | /* Release all sensors */ | |
740 | /* One more crappy race: I don't think we have any guarantee here | |
741 | * that the attribute callback won't race with the sensor beeing | |
742 | * disposed of, and I'm not 100% certain what best way to deal | |
743 | * with that except by adding locks all over... I'll do that | |
744 | * eventually but heh, who ever rmmod this module anyway ? | |
745 | */ | |
ac171c46 | 746 | if (sensor_cpu_power) |
75722d39 | 747 | wf_put_sensor(sensor_cpu_power); |
ac171c46 | 748 | if (sensor_cpu_temp) |
75722d39 | 749 | wf_put_sensor(sensor_cpu_temp); |
ac171c46 | 750 | if (sensor_hd_temp) |
75722d39 | 751 | wf_put_sensor(sensor_hd_temp); |
75722d39 BH |
752 | |
753 | /* Release all controls */ | |
ac171c46 | 754 | if (fan_cpu_main) |
75722d39 | 755 | wf_put_control(fan_cpu_main); |
ac171c46 | 756 | if (fan_hd) |
75722d39 | 757 | wf_put_control(fan_hd); |
ac171c46 | 758 | if (fan_system) |
75722d39 | 759 | wf_put_control(fan_system); |
75722d39 BH |
760 | if (cpufreq_clamp) |
761 | wf_put_control(cpufreq_clamp); | |
762 | ||
763 | /* Destroy control loops state structures */ | |
764 | if (wf_smu_sys_fans) | |
765 | kfree(wf_smu_sys_fans); | |
766 | if (wf_smu_cpu_fans) | |
767 | kfree(wf_smu_cpu_fans); | |
768 | ||
769 | wf_smu_dev = NULL; | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
774 | static struct device_driver wf_smu_driver = { | |
775 | .name = "windfarm", | |
776 | .bus = &platform_bus_type, | |
777 | .probe = wf_smu_probe, | |
778 | .remove = wf_smu_remove, | |
779 | }; | |
780 | ||
781 | ||
782 | static int __init wf_smu_init(void) | |
783 | { | |
784 | int rc = -ENODEV; | |
785 | ||
786 | if (machine_is_compatible("PowerMac8,1") || | |
787 | machine_is_compatible("PowerMac8,2")) | |
788 | rc = wf_init_pm(); | |
789 | ||
790 | if (rc == 0) { | |
791 | #ifdef MODULE | |
792 | request_module("windfarm_smu_controls"); | |
793 | request_module("windfarm_smu_sensors"); | |
794 | request_module("windfarm_lm75_sensor"); | |
795 | ||
796 | #endif /* MODULE */ | |
797 | driver_register(&wf_smu_driver); | |
798 | } | |
799 | ||
800 | return rc; | |
801 | } | |
802 | ||
803 | static void __exit wf_smu_exit(void) | |
804 | { | |
805 | ||
806 | driver_unregister(&wf_smu_driver); | |
807 | } | |
808 | ||
809 | ||
810 | module_init(wf_smu_init); | |
811 | module_exit(wf_smu_exit); | |
812 | ||
813 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
814 | MODULE_DESCRIPTION("Thermal control logic for iMac G5"); | |
815 | MODULE_LICENSE("GPL"); | |
816 |