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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> | |
75722d39 BH |
110 | #include <asm/sections.h> |
111 | #include <asm/smu.h> | |
112 | ||
113 | #include "windfarm.h" | |
114 | #include "windfarm_pid.h" | |
115 | ||
116 | #define VERSION "0.4" | |
117 | ||
118 | #undef DEBUG | |
119 | ||
120 | #ifdef DEBUG | |
121 | #define DBG(args...) printk(args) | |
122 | #else | |
123 | #define DBG(args...) do { } while(0) | |
124 | #endif | |
125 | ||
126 | /* define this to force CPU overtemp to 74 degree, useful for testing | |
127 | * the overtemp code | |
128 | */ | |
129 | #undef HACKED_OVERTEMP | |
130 | ||
131 | static int wf_smu_mach_model; /* machine model id */ | |
132 | ||
75722d39 BH |
133 | /* Controls & sensors */ |
134 | static struct wf_sensor *sensor_cpu_power; | |
135 | static struct wf_sensor *sensor_cpu_temp; | |
136 | static struct wf_sensor *sensor_hd_temp; | |
137 | static struct wf_control *fan_cpu_main; | |
138 | static struct wf_control *fan_hd; | |
139 | static struct wf_control *fan_system; | |
140 | static struct wf_control *cpufreq_clamp; | |
141 | ||
142 | /* Set to kick the control loop into life */ | |
4f256d56 GS |
143 | static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok; |
144 | static bool wf_smu_started; | |
75722d39 BH |
145 | |
146 | /* Failure handling.. could be nicer */ | |
147 | #define FAILURE_FAN 0x01 | |
148 | #define FAILURE_SENSOR 0x02 | |
149 | #define FAILURE_OVERTEMP 0x04 | |
150 | ||
151 | static unsigned int wf_smu_failure_state; | |
152 | static int wf_smu_readjust, wf_smu_skipping; | |
4bb29711 | 153 | static bool wf_smu_overtemp; |
75722d39 BH |
154 | |
155 | /* | |
156 | * ****** System Fans Control Loop ****** | |
157 | * | |
158 | */ | |
159 | ||
160 | /* Parameters for the System Fans control loop. Parameters | |
161 | * not in this table such as interval, history size, ... | |
162 | * are common to all versions and thus hard coded for now. | |
163 | */ | |
164 | struct wf_smu_sys_fans_param { | |
165 | int model_id; | |
166 | s32 itarget; | |
167 | s32 gd, gp, gr; | |
168 | ||
169 | s16 offset0; | |
170 | u16 scale0; | |
171 | s16 offset1; | |
172 | u16 scale1; | |
173 | }; | |
174 | ||
175 | #define WF_SMU_SYS_FANS_INTERVAL 5 | |
176 | #define WF_SMU_SYS_FANS_HISTORY_SIZE 2 | |
177 | ||
178 | /* State data used by the system fans control loop | |
179 | */ | |
180 | struct wf_smu_sys_fans_state { | |
181 | int ticks; | |
182 | s32 sys_setpoint; | |
183 | s32 hd_setpoint; | |
184 | s16 offset0; | |
185 | u16 scale0; | |
186 | s16 offset1; | |
187 | u16 scale1; | |
188 | struct wf_pid_state pid; | |
189 | }; | |
190 | ||
191 | /* | |
88393161 | 192 | * Configs for SMU System Fan control loop |
75722d39 BH |
193 | */ |
194 | static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = { | |
195 | /* Model ID 2 */ | |
196 | { | |
197 | .model_id = 2, | |
198 | .itarget = 0x3a0000, | |
199 | .gd = 0x15400000, | |
200 | .gp = 0x00200000, | |
201 | .gr = 0x000002fd, | |
202 | .offset0 = 0xff38, | |
203 | .scale0 = 0x0ccd, | |
204 | .offset1 = 0x0208, | |
205 | .scale1 = 0x07ae, | |
206 | }, | |
207 | /* Model ID 3 */ | |
208 | { | |
326743ea | 209 | .model_id = 3, |
75722d39 BH |
210 | .itarget = 0x350000, |
211 | .gd = 0x08e00000, | |
212 | .gp = 0x00566666, | |
213 | .gr = 0x0000072b, | |
214 | .offset0 = 0xff38, | |
215 | .scale0 = 0x0ccd, | |
216 | .offset1 = 0x0000, | |
217 | .scale1 = 0x0000, | |
218 | }, | |
219 | /* Model ID 5 */ | |
220 | { | |
326743ea | 221 | .model_id = 5, |
75722d39 BH |
222 | .itarget = 0x3a0000, |
223 | .gd = 0x15400000, | |
224 | .gp = 0x00233333, | |
225 | .gr = 0x000002fd, | |
226 | .offset0 = 0x0000, | |
227 | .scale0 = 0x1000, | |
228 | .offset1 = 0x0091, | |
229 | .scale1 = 0x0bae, | |
230 | }, | |
231 | }; | |
232 | #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params) | |
233 | ||
234 | static struct wf_smu_sys_fans_state *wf_smu_sys_fans; | |
235 | ||
236 | /* | |
237 | * ****** CPU Fans Control Loop ****** | |
238 | * | |
239 | */ | |
240 | ||
241 | ||
242 | #define WF_SMU_CPU_FANS_INTERVAL 1 | |
243 | #define WF_SMU_CPU_FANS_MAX_HISTORY 16 | |
244 | #define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000 | |
245 | #define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50 | |
246 | ||
247 | /* State data used by the cpu fans control loop | |
248 | */ | |
249 | struct wf_smu_cpu_fans_state { | |
250 | int ticks; | |
251 | s32 cpu_setpoint; | |
252 | s32 scale; | |
253 | s32 offset; | |
254 | struct wf_cpu_pid_state pid; | |
255 | }; | |
256 | ||
257 | static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; | |
258 | ||
259 | ||
260 | ||
261 | /* | |
262 | * ***** Implementation ***** | |
263 | * | |
264 | */ | |
265 | ||
266 | static void wf_smu_create_sys_fans(void) | |
267 | { | |
268 | struct wf_smu_sys_fans_param *param = NULL; | |
269 | struct wf_pid_param pid_param; | |
270 | int i; | |
271 | ||
272 | /* First, locate the params for this model */ | |
273 | for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++) | |
274 | if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) { | |
275 | param = &wf_smu_sys_all_params[i]; | |
276 | break; | |
277 | } | |
278 | ||
279 | /* No params found, put fans to max */ | |
280 | if (param == NULL) { | |
281 | printk(KERN_WARNING "windfarm: System fan config not found " | |
282 | "for this machine model, max fan speed\n"); | |
283 | goto fail; | |
284 | } | |
285 | ||
286 | /* Alloc & initialize state */ | |
287 | wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state), | |
288 | GFP_KERNEL); | |
289 | if (wf_smu_sys_fans == NULL) { | |
290 | printk(KERN_WARNING "windfarm: Memory allocation error" | |
291 | " max fan speed\n"); | |
292 | goto fail; | |
293 | } | |
294 | wf_smu_sys_fans->ticks = 1; | |
295 | wf_smu_sys_fans->scale0 = param->scale0; | |
296 | wf_smu_sys_fans->offset0 = param->offset0; | |
297 | wf_smu_sys_fans->scale1 = param->scale1; | |
298 | wf_smu_sys_fans->offset1 = param->offset1; | |
299 | ||
300 | /* Fill PID params */ | |
301 | pid_param.gd = param->gd; | |
302 | pid_param.gp = param->gp; | |
303 | pid_param.gr = param->gr; | |
304 | pid_param.interval = WF_SMU_SYS_FANS_INTERVAL; | |
305 | pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE; | |
306 | pid_param.itarget = param->itarget; | |
33e6820b BH |
307 | pid_param.min = wf_control_get_min(fan_system); |
308 | pid_param.max = wf_control_get_max(fan_system); | |
75722d39 BH |
309 | if (fan_hd) { |
310 | pid_param.min = | |
33e6820b | 311 | max(pid_param.min, wf_control_get_min(fan_hd)); |
75722d39 | 312 | pid_param.max = |
33e6820b | 313 | min(pid_param.max, wf_control_get_max(fan_hd)); |
75722d39 BH |
314 | } |
315 | wf_pid_init(&wf_smu_sys_fans->pid, &pid_param); | |
316 | ||
317 | DBG("wf: System Fan control initialized.\n"); | |
318 | DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", | |
319 | FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max); | |
320 | return; | |
321 | ||
322 | fail: | |
323 | ||
324 | if (fan_system) | |
325 | wf_control_set_max(fan_system); | |
326 | if (fan_hd) | |
327 | wf_control_set_max(fan_hd); | |
328 | } | |
329 | ||
330 | static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st) | |
331 | { | |
332 | s32 new_setpoint, temp, scaled, cputarget; | |
333 | int rc; | |
334 | ||
335 | if (--st->ticks != 0) { | |
336 | if (wf_smu_readjust) | |
337 | goto readjust; | |
338 | return; | |
339 | } | |
340 | st->ticks = WF_SMU_SYS_FANS_INTERVAL; | |
341 | ||
33e6820b | 342 | rc = wf_sensor_get(sensor_hd_temp, &temp); |
75722d39 BH |
343 | if (rc) { |
344 | printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", | |
345 | rc); | |
346 | wf_smu_failure_state |= FAILURE_SENSOR; | |
347 | return; | |
348 | } | |
349 | ||
350 | DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n", | |
351 | FIX32TOPRINT(temp)); | |
352 | ||
353 | if (temp > (st->pid.param.itarget + 0x50000)) | |
354 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
355 | ||
356 | new_setpoint = wf_pid_run(&st->pid, temp); | |
357 | ||
358 | DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); | |
359 | ||
360 | scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0; | |
361 | ||
362 | DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled); | |
363 | ||
364 | cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0; | |
365 | cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1; | |
366 | scaled = max(scaled, cputarget); | |
367 | scaled = max(scaled, st->pid.param.min); | |
368 | scaled = min(scaled, st->pid.param.max); | |
369 | ||
370 | DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled); | |
371 | ||
372 | if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint) | |
373 | return; | |
374 | st->sys_setpoint = scaled; | |
375 | st->hd_setpoint = new_setpoint; | |
376 | readjust: | |
377 | if (fan_system && wf_smu_failure_state == 0) { | |
33e6820b | 378 | rc = wf_control_set(fan_system, st->sys_setpoint); |
75722d39 BH |
379 | if (rc) { |
380 | printk(KERN_WARNING "windfarm: Sys fan error %d\n", | |
381 | rc); | |
382 | wf_smu_failure_state |= FAILURE_FAN; | |
383 | } | |
384 | } | |
385 | if (fan_hd && wf_smu_failure_state == 0) { | |
33e6820b | 386 | rc = wf_control_set(fan_hd, st->hd_setpoint); |
75722d39 BH |
387 | if (rc) { |
388 | printk(KERN_WARNING "windfarm: HD fan error %d\n", | |
389 | rc); | |
390 | wf_smu_failure_state |= FAILURE_FAN; | |
391 | } | |
392 | } | |
393 | } | |
394 | ||
395 | static void wf_smu_create_cpu_fans(void) | |
396 | { | |
397 | struct wf_cpu_pid_param pid_param; | |
018a3d1d | 398 | const struct smu_sdbp_header *hdr; |
75722d39 BH |
399 | struct smu_sdbp_cpupiddata *piddata; |
400 | struct smu_sdbp_fvt *fvt; | |
401 | s32 tmax, tdelta, maxpow, powadj; | |
402 | ||
403 | /* First, locate the PID params in SMU SBD */ | |
404 | hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); | |
405 | if (hdr == 0) { | |
406 | printk(KERN_WARNING "windfarm: CPU PID fan config not found " | |
407 | "max fan speed\n"); | |
408 | goto fail; | |
409 | } | |
410 | piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; | |
411 | ||
412 | /* Get the FVT params for operating point 0 (the only supported one | |
413 | * for now) in order to get tmax | |
414 | */ | |
415 | hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); | |
416 | if (hdr) { | |
417 | fvt = (struct smu_sdbp_fvt *)&hdr[1]; | |
418 | tmax = ((s32)fvt->maxtemp) << 16; | |
419 | } else | |
420 | tmax = 0x5e0000; /* 94 degree default */ | |
421 | ||
422 | /* Alloc & initialize state */ | |
423 | wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), | |
424 | GFP_KERNEL); | |
425 | if (wf_smu_cpu_fans == NULL) | |
426 | goto fail; | |
427 | wf_smu_cpu_fans->ticks = 1; | |
428 | ||
429 | wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE; | |
430 | wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET; | |
431 | ||
432 | /* Fill PID params */ | |
433 | pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; | |
434 | pid_param.history_len = piddata->history_len; | |
435 | if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { | |
436 | printk(KERN_WARNING "windfarm: History size overflow on " | |
437 | "CPU control loop (%d)\n", piddata->history_len); | |
438 | pid_param.history_len = WF_CPU_PID_MAX_HISTORY; | |
439 | } | |
440 | pid_param.gd = piddata->gd; | |
441 | pid_param.gp = piddata->gp; | |
442 | pid_param.gr = piddata->gr / pid_param.history_len; | |
443 | ||
444 | tdelta = ((s32)piddata->target_temp_delta) << 16; | |
445 | maxpow = ((s32)piddata->max_power) << 16; | |
446 | powadj = ((s32)piddata->power_adj) << 16; | |
447 | ||
448 | pid_param.tmax = tmax; | |
449 | pid_param.ttarget = tmax - tdelta; | |
450 | pid_param.pmaxadj = maxpow - powadj; | |
451 | ||
33e6820b BH |
452 | pid_param.min = wf_control_get_min(fan_cpu_main); |
453 | pid_param.max = wf_control_get_max(fan_cpu_main); | |
75722d39 BH |
454 | |
455 | wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); | |
456 | ||
457 | DBG("wf: CPU Fan control initialized.\n"); | |
458 | DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", | |
459 | FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), | |
460 | pid_param.min, pid_param.max); | |
461 | ||
462 | return; | |
463 | ||
464 | fail: | |
465 | printk(KERN_WARNING "windfarm: CPU fan config not found\n" | |
466 | "for this machine model, max fan speed\n"); | |
467 | ||
468 | if (cpufreq_clamp) | |
469 | wf_control_set_max(cpufreq_clamp); | |
470 | if (fan_cpu_main) | |
471 | wf_control_set_max(fan_cpu_main); | |
472 | } | |
473 | ||
474 | static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) | |
475 | { | |
476 | s32 new_setpoint, temp, power, systarget; | |
477 | int rc; | |
478 | ||
479 | if (--st->ticks != 0) { | |
480 | if (wf_smu_readjust) | |
481 | goto readjust; | |
482 | return; | |
483 | } | |
484 | st->ticks = WF_SMU_CPU_FANS_INTERVAL; | |
485 | ||
33e6820b | 486 | rc = wf_sensor_get(sensor_cpu_temp, &temp); |
75722d39 BH |
487 | if (rc) { |
488 | printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", | |
489 | rc); | |
490 | wf_smu_failure_state |= FAILURE_SENSOR; | |
491 | return; | |
492 | } | |
493 | ||
33e6820b | 494 | rc = wf_sensor_get(sensor_cpu_power, &power); |
75722d39 BH |
495 | if (rc) { |
496 | printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", | |
497 | rc); | |
498 | wf_smu_failure_state |= FAILURE_SENSOR; | |
499 | return; | |
500 | } | |
501 | ||
502 | DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", | |
503 | FIX32TOPRINT(temp), FIX32TOPRINT(power)); | |
504 | ||
505 | #ifdef HACKED_OVERTEMP | |
506 | if (temp > 0x4a0000) | |
507 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
508 | #else | |
509 | if (temp > st->pid.param.tmax) | |
510 | wf_smu_failure_state |= FAILURE_OVERTEMP; | |
511 | #endif | |
512 | new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); | |
513 | ||
514 | DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); | |
515 | ||
516 | systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0; | |
517 | systarget = ((((s64)systarget) * (s64)st->scale) >> 12) | |
518 | + st->offset; | |
519 | new_setpoint = max(new_setpoint, systarget); | |
520 | new_setpoint = max(new_setpoint, st->pid.param.min); | |
521 | new_setpoint = min(new_setpoint, st->pid.param.max); | |
522 | ||
523 | DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint); | |
524 | ||
525 | if (st->cpu_setpoint == new_setpoint) | |
526 | return; | |
527 | st->cpu_setpoint = new_setpoint; | |
528 | readjust: | |
529 | if (fan_cpu_main && wf_smu_failure_state == 0) { | |
33e6820b | 530 | rc = wf_control_set(fan_cpu_main, st->cpu_setpoint); |
75722d39 BH |
531 | if (rc) { |
532 | printk(KERN_WARNING "windfarm: CPU main fan" | |
533 | " error %d\n", rc); | |
534 | wf_smu_failure_state |= FAILURE_FAN; | |
535 | } | |
536 | } | |
537 | } | |
538 | ||
75722d39 BH |
539 | /* |
540 | * ****** Setup / Init / Misc ... ****** | |
541 | * | |
542 | */ | |
543 | ||
544 | static void wf_smu_tick(void) | |
545 | { | |
546 | unsigned int last_failure = wf_smu_failure_state; | |
547 | unsigned int new_failure; | |
548 | ||
549 | if (!wf_smu_started) { | |
550 | DBG("wf: creating control loops !\n"); | |
551 | wf_smu_create_sys_fans(); | |
552 | wf_smu_create_cpu_fans(); | |
4f256d56 | 553 | wf_smu_started = true; |
75722d39 BH |
554 | } |
555 | ||
556 | /* Skipping ticks */ | |
557 | if (wf_smu_skipping && --wf_smu_skipping) | |
558 | return; | |
559 | ||
560 | wf_smu_failure_state = 0; | |
561 | if (wf_smu_sys_fans) | |
562 | wf_smu_sys_fans_tick(wf_smu_sys_fans); | |
563 | if (wf_smu_cpu_fans) | |
564 | wf_smu_cpu_fans_tick(wf_smu_cpu_fans); | |
565 | ||
566 | wf_smu_readjust = 0; | |
567 | new_failure = wf_smu_failure_state & ~last_failure; | |
568 | ||
569 | /* If entering failure mode, clamp cpufreq and ramp all | |
570 | * fans to full speed. | |
571 | */ | |
572 | if (wf_smu_failure_state && !last_failure) { | |
573 | if (cpufreq_clamp) | |
574 | wf_control_set_max(cpufreq_clamp); | |
575 | if (fan_system) | |
576 | wf_control_set_max(fan_system); | |
577 | if (fan_cpu_main) | |
578 | wf_control_set_max(fan_cpu_main); | |
579 | if (fan_hd) | |
580 | wf_control_set_max(fan_hd); | |
581 | } | |
582 | ||
583 | /* If leaving failure mode, unclamp cpufreq and readjust | |
584 | * all fans on next iteration | |
585 | */ | |
586 | if (!wf_smu_failure_state && last_failure) { | |
587 | if (cpufreq_clamp) | |
588 | wf_control_set_min(cpufreq_clamp); | |
589 | wf_smu_readjust = 1; | |
590 | } | |
591 | ||
592 | /* Overtemp condition detected, notify and start skipping a couple | |
593 | * ticks to let the temperature go down | |
594 | */ | |
595 | if (new_failure & FAILURE_OVERTEMP) { | |
596 | wf_set_overtemp(); | |
597 | wf_smu_skipping = 2; | |
4bb29711 | 598 | wf_smu_overtemp = true; |
75722d39 BH |
599 | } |
600 | ||
601 | /* We only clear the overtemp condition if overtemp is cleared | |
602 | * _and_ no other failure is present. Since a sensor error will | |
603 | * clear the overtemp condition (can't measure temperature) at | |
604 | * the control loop levels, but we don't want to keep it clear | |
605 | * here in this case | |
606 | */ | |
4bb29711 | 607 | if (!wf_smu_failure_state && wf_smu_overtemp) { |
75722d39 | 608 | wf_clear_overtemp(); |
4bb29711 AK |
609 | wf_smu_overtemp = false; |
610 | } | |
75722d39 BH |
611 | } |
612 | ||
613 | static void wf_smu_new_control(struct wf_control *ct) | |
614 | { | |
615 | if (wf_smu_all_controls_ok) | |
616 | return; | |
617 | ||
618 | if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) { | |
ac171c46 | 619 | if (wf_get_control(ct) == 0) |
75722d39 | 620 | fan_cpu_main = ct; |
75722d39 BH |
621 | } |
622 | ||
623 | if (fan_system == NULL && !strcmp(ct->name, "system-fan")) { | |
ac171c46 | 624 | if (wf_get_control(ct) == 0) |
75722d39 | 625 | fan_system = ct; |
75722d39 BH |
626 | } |
627 | ||
628 | if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { | |
629 | if (wf_get_control(ct) == 0) | |
630 | cpufreq_clamp = ct; | |
631 | } | |
632 | ||
633 | /* Darwin property list says the HD fan is only for model ID | |
634 | * 0, 1, 2 and 3 | |
635 | */ | |
636 | ||
637 | if (wf_smu_mach_model > 3) { | |
638 | if (fan_system && fan_cpu_main && cpufreq_clamp) | |
639 | wf_smu_all_controls_ok = 1; | |
640 | return; | |
641 | } | |
642 | ||
643 | if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { | |
ac171c46 | 644 | if (wf_get_control(ct) == 0) |
75722d39 | 645 | fan_hd = ct; |
75722d39 BH |
646 | } |
647 | ||
648 | if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp) | |
649 | wf_smu_all_controls_ok = 1; | |
650 | } | |
651 | ||
652 | static void wf_smu_new_sensor(struct wf_sensor *sr) | |
653 | { | |
654 | if (wf_smu_all_sensors_ok) | |
655 | return; | |
656 | ||
657 | if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { | |
ac171c46 | 658 | if (wf_get_sensor(sr) == 0) |
75722d39 | 659 | sensor_cpu_power = sr; |
75722d39 BH |
660 | } |
661 | ||
662 | if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { | |
ac171c46 | 663 | if (wf_get_sensor(sr) == 0) |
75722d39 | 664 | sensor_cpu_temp = sr; |
75722d39 BH |
665 | } |
666 | ||
667 | if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { | |
ac171c46 | 668 | if (wf_get_sensor(sr) == 0) |
75722d39 | 669 | sensor_hd_temp = sr; |
75722d39 BH |
670 | } |
671 | ||
672 | if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp) | |
673 | wf_smu_all_sensors_ok = 1; | |
674 | } | |
675 | ||
676 | ||
677 | static int wf_smu_notify(struct notifier_block *self, | |
678 | unsigned long event, void *data) | |
679 | { | |
680 | switch(event) { | |
681 | case WF_EVENT_NEW_CONTROL: | |
682 | DBG("wf: new control %s detected\n", | |
683 | ((struct wf_control *)data)->name); | |
684 | wf_smu_new_control(data); | |
685 | wf_smu_readjust = 1; | |
686 | break; | |
687 | case WF_EVENT_NEW_SENSOR: | |
688 | DBG("wf: new sensor %s detected\n", | |
689 | ((struct wf_sensor *)data)->name); | |
690 | wf_smu_new_sensor(data); | |
691 | break; | |
692 | case WF_EVENT_TICK: | |
693 | if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) | |
694 | wf_smu_tick(); | |
695 | } | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | static struct notifier_block wf_smu_events = { | |
701 | .notifier_call = wf_smu_notify, | |
702 | }; | |
703 | ||
704 | static int wf_init_pm(void) | |
705 | { | |
018a3d1d | 706 | const struct smu_sdbp_header *hdr; |
75722d39 BH |
707 | |
708 | hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); | |
709 | if (hdr != 0) { | |
710 | struct smu_sdbp_sensortree *st = | |
711 | (struct smu_sdbp_sensortree *)&hdr[1]; | |
712 | wf_smu_mach_model = st->model_id; | |
713 | } | |
714 | ||
715 | printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n", | |
716 | wf_smu_mach_model); | |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
10270613 | 721 | static int wf_smu_probe(struct platform_device *ddev) |
75722d39 | 722 | { |
75722d39 BH |
723 | wf_register_client(&wf_smu_events); |
724 | ||
725 | return 0; | |
726 | } | |
727 | ||
1da42fb6 | 728 | static int wf_smu_remove(struct platform_device *ddev) |
75722d39 BH |
729 | { |
730 | wf_unregister_client(&wf_smu_events); | |
731 | ||
732 | /* XXX We don't have yet a guarantee that our callback isn't | |
733 | * in progress when returning from wf_unregister_client, so | |
734 | * we add an arbitrary delay. I'll have to fix that in the core | |
735 | */ | |
736 | msleep(1000); | |
737 | ||
738 | /* Release all sensors */ | |
739 | /* One more crappy race: I don't think we have any guarantee here | |
740 | * that the attribute callback won't race with the sensor beeing | |
741 | * disposed of, and I'm not 100% certain what best way to deal | |
742 | * with that except by adding locks all over... I'll do that | |
743 | * eventually but heh, who ever rmmod this module anyway ? | |
744 | */ | |
ac171c46 | 745 | if (sensor_cpu_power) |
75722d39 | 746 | wf_put_sensor(sensor_cpu_power); |
ac171c46 | 747 | if (sensor_cpu_temp) |
75722d39 | 748 | wf_put_sensor(sensor_cpu_temp); |
ac171c46 | 749 | if (sensor_hd_temp) |
75722d39 | 750 | wf_put_sensor(sensor_hd_temp); |
75722d39 BH |
751 | |
752 | /* Release all controls */ | |
ac171c46 | 753 | if (fan_cpu_main) |
75722d39 | 754 | wf_put_control(fan_cpu_main); |
ac171c46 | 755 | if (fan_hd) |
75722d39 | 756 | wf_put_control(fan_hd); |
ac171c46 | 757 | if (fan_system) |
75722d39 | 758 | wf_put_control(fan_system); |
75722d39 BH |
759 | if (cpufreq_clamp) |
760 | wf_put_control(cpufreq_clamp); | |
761 | ||
762 | /* Destroy control loops state structures */ | |
6d1bdd2a | 763 | kfree(wf_smu_sys_fans); |
764 | kfree(wf_smu_cpu_fans); | |
75722d39 | 765 | |
75722d39 BH |
766 | return 0; |
767 | } | |
768 | ||
10270613 | 769 | static struct platform_driver wf_smu_driver = { |
75722d39 | 770 | .probe = wf_smu_probe, |
1da42fb6 | 771 | .remove = wf_smu_remove, |
10270613 BH |
772 | .driver = { |
773 | .name = "windfarm", | |
10270613 | 774 | }, |
75722d39 BH |
775 | }; |
776 | ||
777 | ||
778 | static int __init wf_smu_init(void) | |
779 | { | |
780 | int rc = -ENODEV; | |
781 | ||
71a157e8 GL |
782 | if (of_machine_is_compatible("PowerMac8,1") || |
783 | of_machine_is_compatible("PowerMac8,2")) | |
75722d39 BH |
784 | rc = wf_init_pm(); |
785 | ||
786 | if (rc == 0) { | |
787 | #ifdef MODULE | |
788 | request_module("windfarm_smu_controls"); | |
789 | request_module("windfarm_smu_sensors"); | |
790 | request_module("windfarm_lm75_sensor"); | |
d31e8171 | 791 | request_module("windfarm_cpufreq_clamp"); |
75722d39 BH |
792 | |
793 | #endif /* MODULE */ | |
10270613 | 794 | platform_driver_register(&wf_smu_driver); |
75722d39 BH |
795 | } |
796 | ||
797 | return rc; | |
798 | } | |
799 | ||
800 | static void __exit wf_smu_exit(void) | |
801 | { | |
802 | ||
10270613 | 803 | platform_driver_unregister(&wf_smu_driver); |
75722d39 BH |
804 | } |
805 | ||
806 | ||
807 | module_init(wf_smu_init); | |
808 | module_exit(wf_smu_exit); | |
809 | ||
810 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
811 | MODULE_DESCRIPTION("Thermal control logic for iMac G5"); | |
812 | MODULE_LICENSE("GPL"); | |
23386fe5 | 813 | MODULE_ALIAS("platform:windfarm"); |