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ddceed9d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
6cd32099 BH |
2 | /* |
3 | * Windfarm PowerMac thermal control. | |
4 | * Control loops for PowerMac7,2 and 7,3 | |
5 | * | |
6 | * Copyright (C) 2012 Benjamin Herrenschmidt, IBM Corp. | |
6cd32099 BH |
7 | */ |
8 | #include <linux/types.h> | |
9 | #include <linux/errno.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/reboot.h> | |
14 | #include <asm/prom.h> | |
15 | #include <asm/smu.h> | |
16 | ||
17 | #include "windfarm.h" | |
18 | #include "windfarm_pid.h" | |
19 | #include "windfarm_mpu.h" | |
20 | ||
21 | #define VERSION "1.0" | |
22 | ||
23 | #undef DEBUG | |
24 | #undef LOTSA_DEBUG | |
25 | ||
26 | #ifdef DEBUG | |
27 | #define DBG(args...) printk(args) | |
28 | #else | |
29 | #define DBG(args...) do { } while(0) | |
30 | #endif | |
31 | ||
32 | #ifdef LOTSA_DEBUG | |
33 | #define DBG_LOTS(args...) printk(args) | |
34 | #else | |
35 | #define DBG_LOTS(args...) do { } while(0) | |
36 | #endif | |
37 | ||
38 | /* define this to force CPU overtemp to 60 degree, useful for testing | |
39 | * the overtemp code | |
40 | */ | |
41 | #undef HACKED_OVERTEMP | |
42 | ||
43 | /* We currently only handle 2 chips */ | |
44 | #define NR_CHIPS 2 | |
45 | #define NR_CPU_FANS 3 * NR_CHIPS | |
46 | ||
47 | /* Controls and sensors */ | |
48 | static struct wf_sensor *sens_cpu_temp[NR_CHIPS]; | |
49 | static struct wf_sensor *sens_cpu_volts[NR_CHIPS]; | |
50 | static struct wf_sensor *sens_cpu_amps[NR_CHIPS]; | |
51 | static struct wf_sensor *backside_temp; | |
52 | static struct wf_sensor *drives_temp; | |
53 | ||
54 | static struct wf_control *cpu_front_fans[NR_CHIPS]; | |
55 | static struct wf_control *cpu_rear_fans[NR_CHIPS]; | |
56 | static struct wf_control *cpu_pumps[NR_CHIPS]; | |
57 | static struct wf_control *backside_fan; | |
58 | static struct wf_control *drives_fan; | |
59 | static struct wf_control *slots_fan; | |
60 | static struct wf_control *cpufreq_clamp; | |
61 | ||
62 | /* We keep a temperature history for average calculation of 180s */ | |
63 | #define CPU_TEMP_HIST_SIZE 180 | |
64 | ||
65 | /* Fixed speed for slot fan */ | |
66 | #define SLOTS_FAN_DEFAULT_PWM 40 | |
67 | ||
68 | /* Scale value for CPU intake fans */ | |
69 | #define CPU_INTAKE_SCALE 0x0000f852 | |
70 | ||
71 | /* PID loop state */ | |
72 | static const struct mpu_data *cpu_mpu_data[NR_CHIPS]; | |
73 | static struct wf_cpu_pid_state cpu_pid[NR_CHIPS]; | |
74 | static bool cpu_pid_combined; | |
75 | static u32 cpu_thist[CPU_TEMP_HIST_SIZE]; | |
76 | static int cpu_thist_pt; | |
77 | static s64 cpu_thist_total; | |
78 | static s32 cpu_all_tmax = 100 << 16; | |
79 | static struct wf_pid_state backside_pid; | |
80 | static int backside_tick; | |
81 | static struct wf_pid_state drives_pid; | |
82 | static int drives_tick; | |
83 | ||
84 | static int nr_chips; | |
85 | static bool have_all_controls; | |
86 | static bool have_all_sensors; | |
87 | static bool started; | |
88 | ||
89 | static int failure_state; | |
90 | #define FAILURE_SENSOR 1 | |
91 | #define FAILURE_FAN 2 | |
92 | #define FAILURE_PERM 4 | |
93 | #define FAILURE_LOW_OVERTEMP 8 | |
94 | #define FAILURE_HIGH_OVERTEMP 16 | |
95 | ||
96 | /* Overtemp values */ | |
97 | #define LOW_OVER_AVERAGE 0 | |
98 | #define LOW_OVER_IMMEDIATE (10 << 16) | |
99 | #define LOW_OVER_CLEAR ((-10) << 16) | |
100 | #define HIGH_OVER_IMMEDIATE (14 << 16) | |
101 | #define HIGH_OVER_AVERAGE (10 << 16) | |
102 | #define HIGH_OVER_IMMEDIATE (14 << 16) | |
103 | ||
104 | ||
105 | static void cpu_max_all_fans(void) | |
106 | { | |
107 | int i; | |
108 | ||
109 | /* We max all CPU fans in case of a sensor error. We also do the | |
110 | * cpufreq clamping now, even if it's supposedly done later by the | |
111 | * generic code anyway, we do it earlier here to react faster | |
112 | */ | |
113 | if (cpufreq_clamp) | |
114 | wf_control_set_max(cpufreq_clamp); | |
115 | for (i = 0; i < nr_chips; i++) { | |
116 | if (cpu_front_fans[i]) | |
117 | wf_control_set_max(cpu_front_fans[i]); | |
118 | if (cpu_rear_fans[i]) | |
119 | wf_control_set_max(cpu_rear_fans[i]); | |
120 | if (cpu_pumps[i]) | |
121 | wf_control_set_max(cpu_pumps[i]); | |
122 | } | |
123 | } | |
124 | ||
125 | static int cpu_check_overtemp(s32 temp) | |
126 | { | |
127 | int new_state = 0; | |
128 | s32 t_avg, t_old; | |
129 | static bool first = true; | |
130 | ||
131 | /* First check for immediate overtemps */ | |
132 | if (temp >= (cpu_all_tmax + LOW_OVER_IMMEDIATE)) { | |
133 | new_state |= FAILURE_LOW_OVERTEMP; | |
134 | if ((failure_state & FAILURE_LOW_OVERTEMP) == 0) | |
135 | printk(KERN_ERR "windfarm: Overtemp due to immediate CPU" | |
136 | " temperature !\n"); | |
137 | } | |
138 | if (temp >= (cpu_all_tmax + HIGH_OVER_IMMEDIATE)) { | |
139 | new_state |= FAILURE_HIGH_OVERTEMP; | |
140 | if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0) | |
141 | printk(KERN_ERR "windfarm: Critical overtemp due to" | |
142 | " immediate CPU temperature !\n"); | |
143 | } | |
144 | ||
145 | /* | |
146 | * The first time around, initialize the array with the first | |
147 | * temperature reading | |
148 | */ | |
149 | if (first) { | |
150 | int i; | |
151 | ||
152 | cpu_thist_total = 0; | |
153 | for (i = 0; i < CPU_TEMP_HIST_SIZE; i++) { | |
154 | cpu_thist[i] = temp; | |
155 | cpu_thist_total += temp; | |
156 | } | |
157 | first = false; | |
158 | } | |
159 | ||
160 | /* | |
161 | * We calculate a history of max temperatures and use that for the | |
162 | * overtemp management | |
163 | */ | |
164 | t_old = cpu_thist[cpu_thist_pt]; | |
165 | cpu_thist[cpu_thist_pt] = temp; | |
166 | cpu_thist_pt = (cpu_thist_pt + 1) % CPU_TEMP_HIST_SIZE; | |
167 | cpu_thist_total -= t_old; | |
168 | cpu_thist_total += temp; | |
169 | t_avg = cpu_thist_total / CPU_TEMP_HIST_SIZE; | |
170 | ||
171 | DBG_LOTS(" t_avg = %d.%03d (out: %d.%03d, in: %d.%03d)\n", | |
172 | FIX32TOPRINT(t_avg), FIX32TOPRINT(t_old), FIX32TOPRINT(temp)); | |
173 | ||
174 | /* Now check for average overtemps */ | |
175 | if (t_avg >= (cpu_all_tmax + LOW_OVER_AVERAGE)) { | |
176 | new_state |= FAILURE_LOW_OVERTEMP; | |
177 | if ((failure_state & FAILURE_LOW_OVERTEMP) == 0) | |
178 | printk(KERN_ERR "windfarm: Overtemp due to average CPU" | |
179 | " temperature !\n"); | |
180 | } | |
181 | if (t_avg >= (cpu_all_tmax + HIGH_OVER_AVERAGE)) { | |
182 | new_state |= FAILURE_HIGH_OVERTEMP; | |
183 | if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0) | |
184 | printk(KERN_ERR "windfarm: Critical overtemp due to" | |
185 | " average CPU temperature !\n"); | |
186 | } | |
187 | ||
188 | /* Now handle overtemp conditions. We don't currently use the windfarm | |
189 | * overtemp handling core as it's not fully suited to the needs of those | |
190 | * new machine. This will be fixed later. | |
191 | */ | |
192 | if (new_state) { | |
193 | /* High overtemp -> immediate shutdown */ | |
194 | if (new_state & FAILURE_HIGH_OVERTEMP) | |
195 | machine_power_off(); | |
196 | if ((failure_state & new_state) != new_state) | |
197 | cpu_max_all_fans(); | |
198 | failure_state |= new_state; | |
199 | } else if ((failure_state & FAILURE_LOW_OVERTEMP) && | |
200 | (temp < (cpu_all_tmax + LOW_OVER_CLEAR))) { | |
201 | printk(KERN_ERR "windfarm: Overtemp condition cleared !\n"); | |
202 | failure_state &= ~FAILURE_LOW_OVERTEMP; | |
203 | } | |
204 | ||
205 | return failure_state & (FAILURE_LOW_OVERTEMP | FAILURE_HIGH_OVERTEMP); | |
206 | } | |
207 | ||
208 | static int read_one_cpu_vals(int cpu, s32 *temp, s32 *power) | |
209 | { | |
210 | s32 dtemp, volts, amps; | |
211 | int rc; | |
212 | ||
213 | /* Get diode temperature */ | |
214 | rc = wf_sensor_get(sens_cpu_temp[cpu], &dtemp); | |
215 | if (rc) { | |
216 | DBG(" CPU%d: temp reading error !\n", cpu); | |
217 | return -EIO; | |
218 | } | |
219 | DBG_LOTS(" CPU%d: temp = %d.%03d\n", cpu, FIX32TOPRINT((dtemp))); | |
220 | *temp = dtemp; | |
221 | ||
222 | /* Get voltage */ | |
223 | rc = wf_sensor_get(sens_cpu_volts[cpu], &volts); | |
224 | if (rc) { | |
225 | DBG(" CPU%d, volts reading error !\n", cpu); | |
226 | return -EIO; | |
227 | } | |
228 | DBG_LOTS(" CPU%d: volts = %d.%03d\n", cpu, FIX32TOPRINT((volts))); | |
229 | ||
230 | /* Get current */ | |
231 | rc = wf_sensor_get(sens_cpu_amps[cpu], &s); | |
232 | if (rc) { | |
233 | DBG(" CPU%d, current reading error !\n", cpu); | |
234 | return -EIO; | |
235 | } | |
236 | DBG_LOTS(" CPU%d: amps = %d.%03d\n", cpu, FIX32TOPRINT((amps))); | |
237 | ||
238 | /* Calculate power */ | |
239 | ||
240 | /* Scale voltage and current raw sensor values according to fixed scales | |
241 | * obtained in Darwin and calculate power from I and V | |
242 | */ | |
243 | *power = (((u64)volts) * ((u64)amps)) >> 16; | |
244 | ||
245 | DBG_LOTS(" CPU%d: power = %d.%03d\n", cpu, FIX32TOPRINT((*power))); | |
246 | ||
247 | return 0; | |
248 | ||
249 | } | |
250 | ||
251 | static void cpu_fans_tick_split(void) | |
252 | { | |
253 | int err, cpu; | |
254 | s32 intake, temp, power, t_max = 0; | |
255 | ||
256 | DBG_LOTS("* cpu fans_tick_split()\n"); | |
257 | ||
258 | for (cpu = 0; cpu < nr_chips; ++cpu) { | |
259 | struct wf_cpu_pid_state *sp = &cpu_pid[cpu]; | |
260 | ||
261 | /* Read current speed */ | |
262 | wf_control_get(cpu_rear_fans[cpu], &sp->target); | |
263 | ||
264 | DBG_LOTS(" CPU%d: cur_target = %d RPM\n", cpu, sp->target); | |
265 | ||
266 | err = read_one_cpu_vals(cpu, &temp, &power); | |
267 | if (err) { | |
268 | failure_state |= FAILURE_SENSOR; | |
269 | cpu_max_all_fans(); | |
270 | return; | |
271 | } | |
272 | ||
273 | /* Keep track of highest temp */ | |
274 | t_max = max(t_max, temp); | |
275 | ||
276 | /* Handle possible overtemps */ | |
277 | if (cpu_check_overtemp(t_max)) | |
278 | return; | |
279 | ||
280 | /* Run PID */ | |
281 | wf_cpu_pid_run(sp, power, temp); | |
282 | ||
283 | DBG_LOTS(" CPU%d: target = %d RPM\n", cpu, sp->target); | |
284 | ||
285 | /* Apply result directly to exhaust fan */ | |
286 | err = wf_control_set(cpu_rear_fans[cpu], sp->target); | |
287 | if (err) { | |
2ee9a0db KW |
288 | pr_warn("wf_pm72: Fan %s reports error %d\n", |
289 | cpu_rear_fans[cpu]->name, err); | |
6cd32099 BH |
290 | failure_state |= FAILURE_FAN; |
291 | break; | |
292 | } | |
293 | ||
294 | /* Scale result for intake fan */ | |
295 | intake = (sp->target * CPU_INTAKE_SCALE) >> 16; | |
296 | DBG_LOTS(" CPU%d: intake = %d RPM\n", cpu, intake); | |
297 | err = wf_control_set(cpu_front_fans[cpu], intake); | |
298 | if (err) { | |
2ee9a0db KW |
299 | pr_warn("wf_pm72: Fan %s reports error %d\n", |
300 | cpu_front_fans[cpu]->name, err); | |
6cd32099 BH |
301 | failure_state |= FAILURE_FAN; |
302 | break; | |
303 | } | |
304 | } | |
305 | } | |
306 | ||
307 | static void cpu_fans_tick_combined(void) | |
308 | { | |
309 | s32 temp0, power0, temp1, power1, t_max = 0; | |
310 | s32 temp, power, intake, pump; | |
311 | struct wf_control *pump0, *pump1; | |
312 | struct wf_cpu_pid_state *sp = &cpu_pid[0]; | |
313 | int err, cpu; | |
314 | ||
315 | DBG_LOTS("* cpu fans_tick_combined()\n"); | |
316 | ||
317 | /* Read current speed from cpu 0 */ | |
318 | wf_control_get(cpu_rear_fans[0], &sp->target); | |
319 | ||
320 | DBG_LOTS(" CPUs: cur_target = %d RPM\n", sp->target); | |
321 | ||
322 | /* Read values for both CPUs */ | |
323 | err = read_one_cpu_vals(0, &temp0, &power0); | |
324 | if (err) { | |
325 | failure_state |= FAILURE_SENSOR; | |
326 | cpu_max_all_fans(); | |
327 | return; | |
328 | } | |
329 | err = read_one_cpu_vals(1, &temp1, &power1); | |
330 | if (err) { | |
331 | failure_state |= FAILURE_SENSOR; | |
332 | cpu_max_all_fans(); | |
333 | return; | |
334 | } | |
335 | ||
336 | /* Keep track of highest temp */ | |
337 | t_max = max(t_max, max(temp0, temp1)); | |
338 | ||
339 | /* Handle possible overtemps */ | |
340 | if (cpu_check_overtemp(t_max)) | |
341 | return; | |
342 | ||
343 | /* Use the max temp & power of both */ | |
344 | temp = max(temp0, temp1); | |
345 | power = max(power0, power1); | |
346 | ||
347 | /* Run PID */ | |
348 | wf_cpu_pid_run(sp, power, temp); | |
349 | ||
350 | /* Scale result for intake fan */ | |
351 | intake = (sp->target * CPU_INTAKE_SCALE) >> 16; | |
352 | ||
353 | /* Same deal with pump speed */ | |
354 | pump0 = cpu_pumps[0]; | |
355 | pump1 = cpu_pumps[1]; | |
356 | if (!pump0) { | |
357 | pump0 = pump1; | |
358 | pump1 = NULL; | |
359 | } | |
360 | pump = (sp->target * wf_control_get_max(pump0)) / | |
361 | cpu_mpu_data[0]->rmaxn_exhaust_fan; | |
362 | ||
363 | DBG_LOTS(" CPUs: target = %d RPM\n", sp->target); | |
364 | DBG_LOTS(" CPUs: intake = %d RPM\n", intake); | |
365 | DBG_LOTS(" CPUs: pump = %d RPM\n", pump); | |
366 | ||
367 | for (cpu = 0; cpu < nr_chips; cpu++) { | |
368 | err = wf_control_set(cpu_rear_fans[cpu], sp->target); | |
369 | if (err) { | |
2ee9a0db KW |
370 | pr_warn("wf_pm72: Fan %s reports error %d\n", |
371 | cpu_rear_fans[cpu]->name, err); | |
6cd32099 BH |
372 | failure_state |= FAILURE_FAN; |
373 | } | |
374 | err = wf_control_set(cpu_front_fans[cpu], intake); | |
375 | if (err) { | |
2ee9a0db KW |
376 | pr_warn("wf_pm72: Fan %s reports error %d\n", |
377 | cpu_front_fans[cpu]->name, err); | |
6cd32099 BH |
378 | failure_state |= FAILURE_FAN; |
379 | } | |
380 | err = 0; | |
381 | if (cpu_pumps[cpu]) | |
382 | err = wf_control_set(cpu_pumps[cpu], pump); | |
383 | if (err) { | |
2ee9a0db KW |
384 | pr_warn("wf_pm72: Pump %s reports error %d\n", |
385 | cpu_pumps[cpu]->name, err); | |
6cd32099 BH |
386 | failure_state |= FAILURE_FAN; |
387 | } | |
388 | } | |
389 | } | |
390 | ||
391 | /* Implementation... */ | |
392 | static int cpu_setup_pid(int cpu) | |
393 | { | |
394 | struct wf_cpu_pid_param pid; | |
395 | const struct mpu_data *mpu = cpu_mpu_data[cpu]; | |
396 | s32 tmax, ttarget, ptarget; | |
397 | int fmin, fmax, hsize; | |
398 | ||
399 | /* Get PID params from the appropriate MPU EEPROM */ | |
400 | tmax = mpu->tmax << 16; | |
401 | ttarget = mpu->ttarget << 16; | |
402 | ptarget = ((s32)(mpu->pmaxh - mpu->padjmax)) << 16; | |
403 | ||
404 | DBG("wf_72: CPU%d ttarget = %d.%03d, tmax = %d.%03d\n", | |
405 | cpu, FIX32TOPRINT(ttarget), FIX32TOPRINT(tmax)); | |
406 | ||
407 | /* We keep a global tmax for overtemp calculations */ | |
408 | if (tmax < cpu_all_tmax) | |
409 | cpu_all_tmax = tmax; | |
410 | ||
411 | /* Set PID min/max by using the rear fan min/max */ | |
412 | fmin = wf_control_get_min(cpu_rear_fans[cpu]); | |
413 | fmax = wf_control_get_max(cpu_rear_fans[cpu]); | |
414 | DBG("wf_72: CPU%d max RPM range = [%d..%d]\n", cpu, fmin, fmax); | |
415 | ||
416 | /* History size */ | |
417 | hsize = min_t(int, mpu->tguardband, WF_PID_MAX_HISTORY); | |
418 | DBG("wf_72: CPU%d history size = %d\n", cpu, hsize); | |
419 | ||
420 | /* Initialize PID loop */ | |
421 | pid.interval = 1; /* seconds */ | |
422 | pid.history_len = hsize; | |
423 | pid.gd = mpu->pid_gd; | |
424 | pid.gp = mpu->pid_gp; | |
425 | pid.gr = mpu->pid_gr; | |
426 | pid.tmax = tmax; | |
427 | pid.ttarget = ttarget; | |
428 | pid.pmaxadj = ptarget; | |
429 | pid.min = fmin; | |
430 | pid.max = fmax; | |
431 | ||
432 | wf_cpu_pid_init(&cpu_pid[cpu], &pid); | |
433 | cpu_pid[cpu].target = 1000; | |
434 | ||
435 | return 0; | |
436 | } | |
437 | ||
438 | /* Backside/U3 fan */ | |
439 | static struct wf_pid_param backside_u3_param = { | |
440 | .interval = 5, | |
441 | .history_len = 2, | |
442 | .gd = 40 << 20, | |
443 | .gp = 5 << 20, | |
444 | .gr = 0, | |
445 | .itarget = 65 << 16, | |
446 | .additive = 1, | |
447 | .min = 20, | |
448 | .max = 100, | |
449 | }; | |
450 | ||
451 | static struct wf_pid_param backside_u3h_param = { | |
452 | .interval = 5, | |
453 | .history_len = 2, | |
454 | .gd = 20 << 20, | |
455 | .gp = 5 << 20, | |
456 | .gr = 0, | |
457 | .itarget = 75 << 16, | |
458 | .additive = 1, | |
459 | .min = 20, | |
460 | .max = 100, | |
461 | }; | |
462 | ||
463 | static void backside_fan_tick(void) | |
464 | { | |
465 | s32 temp; | |
466 | int speed; | |
467 | int err; | |
468 | ||
469 | if (!backside_fan || !backside_temp || !backside_tick) | |
470 | return; | |
471 | if (--backside_tick > 0) | |
472 | return; | |
473 | backside_tick = backside_pid.param.interval; | |
474 | ||
475 | DBG_LOTS("* backside fans tick\n"); | |
476 | ||
477 | /* Update fan speed from actual fans */ | |
478 | err = wf_control_get(backside_fan, &speed); | |
479 | if (!err) | |
480 | backside_pid.target = speed; | |
481 | ||
482 | err = wf_sensor_get(backside_temp, &temp); | |
483 | if (err) { | |
484 | printk(KERN_WARNING "windfarm: U4 temp sensor error %d\n", | |
485 | err); | |
486 | failure_state |= FAILURE_SENSOR; | |
487 | wf_control_set_max(backside_fan); | |
488 | return; | |
489 | } | |
490 | speed = wf_pid_run(&backside_pid, temp); | |
491 | ||
492 | DBG_LOTS("backside PID temp=%d.%.3d speed=%d\n", | |
493 | FIX32TOPRINT(temp), speed); | |
494 | ||
495 | err = wf_control_set(backside_fan, speed); | |
496 | if (err) { | |
497 | printk(KERN_WARNING "windfarm: backside fan error %d\n", err); | |
498 | failure_state |= FAILURE_FAN; | |
499 | } | |
500 | } | |
501 | ||
502 | static void backside_setup_pid(void) | |
503 | { | |
504 | /* first time initialize things */ | |
505 | s32 fmin = wf_control_get_min(backside_fan); | |
506 | s32 fmax = wf_control_get_max(backside_fan); | |
507 | struct wf_pid_param param; | |
508 | struct device_node *u3; | |
509 | int u3h = 1; /* conservative by default */ | |
510 | ||
511 | u3 = of_find_node_by_path("/u3@0,f8000000"); | |
512 | if (u3 != NULL) { | |
513 | const u32 *vers = of_get_property(u3, "device-rev", NULL); | |
514 | if (vers) | |
515 | if (((*vers) & 0x3f) < 0x34) | |
516 | u3h = 0; | |
517 | of_node_put(u3); | |
518 | } | |
519 | ||
520 | param = u3h ? backside_u3h_param : backside_u3_param; | |
521 | ||
522 | param.min = max(param.min, fmin); | |
523 | param.max = min(param.max, fmax); | |
524 | wf_pid_init(&backside_pid, ¶m); | |
525 | backside_tick = 1; | |
526 | ||
527 | pr_info("wf_pm72: Backside control loop started.\n"); | |
528 | } | |
529 | ||
530 | /* Drive bay fan */ | |
531 | static const struct wf_pid_param drives_param = { | |
532 | .interval = 5, | |
533 | .history_len = 2, | |
534 | .gd = 30 << 20, | |
535 | .gp = 5 << 20, | |
536 | .gr = 0, | |
537 | .itarget = 40 << 16, | |
538 | .additive = 1, | |
539 | .min = 300, | |
540 | .max = 4000, | |
541 | }; | |
542 | ||
543 | static void drives_fan_tick(void) | |
544 | { | |
545 | s32 temp; | |
546 | int speed; | |
547 | int err; | |
548 | ||
549 | if (!drives_fan || !drives_temp || !drives_tick) | |
550 | return; | |
551 | if (--drives_tick > 0) | |
552 | return; | |
553 | drives_tick = drives_pid.param.interval; | |
554 | ||
555 | DBG_LOTS("* drives fans tick\n"); | |
556 | ||
557 | /* Update fan speed from actual fans */ | |
558 | err = wf_control_get(drives_fan, &speed); | |
559 | if (!err) | |
560 | drives_pid.target = speed; | |
561 | ||
562 | err = wf_sensor_get(drives_temp, &temp); | |
563 | if (err) { | |
2ee9a0db | 564 | pr_warn("wf_pm72: drive bay temp sensor error %d\n", err); |
6cd32099 BH |
565 | failure_state |= FAILURE_SENSOR; |
566 | wf_control_set_max(drives_fan); | |
567 | return; | |
568 | } | |
569 | speed = wf_pid_run(&drives_pid, temp); | |
570 | ||
571 | DBG_LOTS("drives PID temp=%d.%.3d speed=%d\n", | |
572 | FIX32TOPRINT(temp), speed); | |
573 | ||
574 | err = wf_control_set(drives_fan, speed); | |
575 | if (err) { | |
576 | printk(KERN_WARNING "windfarm: drive bay fan error %d\n", err); | |
577 | failure_state |= FAILURE_FAN; | |
578 | } | |
579 | } | |
580 | ||
581 | static void drives_setup_pid(void) | |
582 | { | |
583 | /* first time initialize things */ | |
584 | s32 fmin = wf_control_get_min(drives_fan); | |
585 | s32 fmax = wf_control_get_max(drives_fan); | |
586 | struct wf_pid_param param = drives_param; | |
587 | ||
588 | param.min = max(param.min, fmin); | |
589 | param.max = min(param.max, fmax); | |
590 | wf_pid_init(&drives_pid, ¶m); | |
591 | drives_tick = 1; | |
592 | ||
593 | pr_info("wf_pm72: Drive bay control loop started.\n"); | |
594 | } | |
595 | ||
596 | static void set_fail_state(void) | |
597 | { | |
598 | cpu_max_all_fans(); | |
599 | ||
600 | if (backside_fan) | |
601 | wf_control_set_max(backside_fan); | |
602 | if (slots_fan) | |
603 | wf_control_set_max(slots_fan); | |
604 | if (drives_fan) | |
605 | wf_control_set_max(drives_fan); | |
606 | } | |
607 | ||
608 | static void pm72_tick(void) | |
609 | { | |
610 | int i, last_failure; | |
611 | ||
612 | if (!started) { | |
4f256d56 | 613 | started = true; |
6cd32099 BH |
614 | printk(KERN_INFO "windfarm: CPUs control loops started.\n"); |
615 | for (i = 0; i < nr_chips; ++i) { | |
616 | if (cpu_setup_pid(i) < 0) { | |
617 | failure_state = FAILURE_PERM; | |
618 | set_fail_state(); | |
619 | break; | |
620 | } | |
621 | } | |
622 | DBG_LOTS("cpu_all_tmax=%d.%03d\n", FIX32TOPRINT(cpu_all_tmax)); | |
623 | ||
624 | backside_setup_pid(); | |
625 | drives_setup_pid(); | |
626 | ||
627 | /* | |
628 | * We don't have the right stuff to drive the PCI fan | |
629 | * so we fix it to a default value | |
630 | */ | |
631 | wf_control_set(slots_fan, SLOTS_FAN_DEFAULT_PWM); | |
632 | ||
633 | #ifdef HACKED_OVERTEMP | |
634 | cpu_all_tmax = 60 << 16; | |
635 | #endif | |
636 | } | |
637 | ||
638 | /* Permanent failure, bail out */ | |
639 | if (failure_state & FAILURE_PERM) | |
640 | return; | |
641 | ||
642 | /* | |
643 | * Clear all failure bits except low overtemp which will be eventually | |
644 | * cleared by the control loop itself | |
645 | */ | |
646 | last_failure = failure_state; | |
647 | failure_state &= FAILURE_LOW_OVERTEMP; | |
648 | if (cpu_pid_combined) | |
649 | cpu_fans_tick_combined(); | |
650 | else | |
651 | cpu_fans_tick_split(); | |
652 | backside_fan_tick(); | |
653 | drives_fan_tick(); | |
654 | ||
655 | DBG_LOTS(" last_failure: 0x%x, failure_state: %x\n", | |
656 | last_failure, failure_state); | |
657 | ||
658 | /* Check for failures. Any failure causes cpufreq clamping */ | |
659 | if (failure_state && last_failure == 0 && cpufreq_clamp) | |
660 | wf_control_set_max(cpufreq_clamp); | |
661 | if (failure_state == 0 && last_failure && cpufreq_clamp) | |
662 | wf_control_set_min(cpufreq_clamp); | |
663 | ||
664 | /* That's it for now, we might want to deal with other failures | |
665 | * differently in the future though | |
666 | */ | |
667 | } | |
668 | ||
669 | static void pm72_new_control(struct wf_control *ct) | |
670 | { | |
671 | bool all_controls; | |
672 | bool had_pump = cpu_pumps[0] || cpu_pumps[1]; | |
673 | ||
674 | if (!strcmp(ct->name, "cpu-front-fan-0")) | |
675 | cpu_front_fans[0] = ct; | |
676 | else if (!strcmp(ct->name, "cpu-front-fan-1")) | |
677 | cpu_front_fans[1] = ct; | |
678 | else if (!strcmp(ct->name, "cpu-rear-fan-0")) | |
679 | cpu_rear_fans[0] = ct; | |
680 | else if (!strcmp(ct->name, "cpu-rear-fan-1")) | |
681 | cpu_rear_fans[1] = ct; | |
682 | else if (!strcmp(ct->name, "cpu-pump-0")) | |
683 | cpu_pumps[0] = ct; | |
684 | else if (!strcmp(ct->name, "cpu-pump-1")) | |
685 | cpu_pumps[1] = ct; | |
686 | else if (!strcmp(ct->name, "backside-fan")) | |
687 | backside_fan = ct; | |
688 | else if (!strcmp(ct->name, "slots-fan")) | |
689 | slots_fan = ct; | |
690 | else if (!strcmp(ct->name, "drive-bay-fan")) | |
691 | drives_fan = ct; | |
692 | else if (!strcmp(ct->name, "cpufreq-clamp")) | |
693 | cpufreq_clamp = ct; | |
694 | ||
695 | all_controls = | |
696 | cpu_front_fans[0] && | |
697 | cpu_rear_fans[0] && | |
698 | backside_fan && | |
699 | slots_fan && | |
700 | drives_fan; | |
701 | if (nr_chips > 1) | |
702 | all_controls &= | |
703 | cpu_front_fans[1] && | |
704 | cpu_rear_fans[1]; | |
705 | have_all_controls = all_controls; | |
706 | ||
707 | if ((cpu_pumps[0] || cpu_pumps[1]) && !had_pump) { | |
708 | pr_info("wf_pm72: Liquid cooling pump(s) detected," | |
709 | " using new algorithm !\n"); | |
710 | cpu_pid_combined = true; | |
711 | } | |
712 | } | |
713 | ||
714 | ||
715 | static void pm72_new_sensor(struct wf_sensor *sr) | |
716 | { | |
717 | bool all_sensors; | |
718 | ||
719 | if (!strcmp(sr->name, "cpu-diode-temp-0")) | |
720 | sens_cpu_temp[0] = sr; | |
721 | else if (!strcmp(sr->name, "cpu-diode-temp-1")) | |
722 | sens_cpu_temp[1] = sr; | |
723 | else if (!strcmp(sr->name, "cpu-voltage-0")) | |
724 | sens_cpu_volts[0] = sr; | |
725 | else if (!strcmp(sr->name, "cpu-voltage-1")) | |
726 | sens_cpu_volts[1] = sr; | |
727 | else if (!strcmp(sr->name, "cpu-current-0")) | |
728 | sens_cpu_amps[0] = sr; | |
729 | else if (!strcmp(sr->name, "cpu-current-1")) | |
730 | sens_cpu_amps[1] = sr; | |
731 | else if (!strcmp(sr->name, "backside-temp")) | |
732 | backside_temp = sr; | |
733 | else if (!strcmp(sr->name, "hd-temp")) | |
734 | drives_temp = sr; | |
735 | ||
736 | all_sensors = | |
737 | sens_cpu_temp[0] && | |
738 | sens_cpu_volts[0] && | |
739 | sens_cpu_amps[0] && | |
740 | backside_temp && | |
741 | drives_temp; | |
742 | if (nr_chips > 1) | |
743 | all_sensors &= | |
744 | sens_cpu_temp[1] && | |
745 | sens_cpu_volts[1] && | |
746 | sens_cpu_amps[1]; | |
747 | ||
748 | have_all_sensors = all_sensors; | |
749 | } | |
750 | ||
751 | static int pm72_wf_notify(struct notifier_block *self, | |
752 | unsigned long event, void *data) | |
753 | { | |
754 | switch (event) { | |
755 | case WF_EVENT_NEW_SENSOR: | |
756 | pm72_new_sensor(data); | |
757 | break; | |
758 | case WF_EVENT_NEW_CONTROL: | |
759 | pm72_new_control(data); | |
760 | break; | |
761 | case WF_EVENT_TICK: | |
762 | if (have_all_controls && have_all_sensors) | |
763 | pm72_tick(); | |
764 | } | |
765 | return 0; | |
766 | } | |
767 | ||
768 | static struct notifier_block pm72_events = { | |
769 | .notifier_call = pm72_wf_notify, | |
770 | }; | |
771 | ||
772 | static int wf_pm72_probe(struct platform_device *dev) | |
773 | { | |
774 | wf_register_client(&pm72_events); | |
775 | return 0; | |
776 | } | |
777 | ||
1da42fb6 | 778 | static int wf_pm72_remove(struct platform_device *dev) |
6cd32099 BH |
779 | { |
780 | wf_unregister_client(&pm72_events); | |
781 | ||
782 | /* should release all sensors and controls */ | |
783 | return 0; | |
784 | } | |
785 | ||
786 | static struct platform_driver wf_pm72_driver = { | |
787 | .probe = wf_pm72_probe, | |
788 | .remove = wf_pm72_remove, | |
789 | .driver = { | |
790 | .name = "windfarm", | |
6cd32099 BH |
791 | }, |
792 | }; | |
793 | ||
794 | static int __init wf_pm72_init(void) | |
795 | { | |
796 | struct device_node *cpu; | |
797 | int i; | |
798 | ||
799 | if (!of_machine_is_compatible("PowerMac7,2") && | |
800 | !of_machine_is_compatible("PowerMac7,3")) | |
801 | return -ENODEV; | |
802 | ||
803 | /* Count the number of CPU cores */ | |
804 | nr_chips = 0; | |
c7c360ee | 805 | for_each_node_by_type(cpu, "cpu") |
6cd32099 BH |
806 | ++nr_chips; |
807 | if (nr_chips > NR_CHIPS) | |
808 | nr_chips = NR_CHIPS; | |
809 | ||
810 | pr_info("windfarm: Initializing for desktop G5 with %d chips\n", | |
811 | nr_chips); | |
812 | ||
813 | /* Get MPU data for each CPU */ | |
814 | for (i = 0; i < nr_chips; i++) { | |
815 | cpu_mpu_data[i] = wf_get_mpu(i); | |
816 | if (!cpu_mpu_data[i]) { | |
817 | pr_err("wf_pm72: Failed to find MPU data for CPU %d\n", i); | |
818 | return -ENXIO; | |
819 | } | |
820 | } | |
821 | ||
822 | #ifdef MODULE | |
823 | request_module("windfarm_fcu_controls"); | |
824 | request_module("windfarm_lm75_sensor"); | |
825 | request_module("windfarm_ad7417_sensor"); | |
826 | request_module("windfarm_max6690_sensor"); | |
827 | request_module("windfarm_cpufreq_clamp"); | |
828 | #endif /* MODULE */ | |
829 | ||
830 | platform_driver_register(&wf_pm72_driver); | |
831 | return 0; | |
832 | } | |
833 | ||
834 | static void __exit wf_pm72_exit(void) | |
835 | { | |
836 | platform_driver_unregister(&wf_pm72_driver); | |
837 | } | |
838 | ||
839 | module_init(wf_pm72_init); | |
840 | module_exit(wf_pm72_exit); | |
841 | ||
842 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
843 | MODULE_DESCRIPTION("Thermal control for AGP PowerMac G5s"); | |
844 | MODULE_LICENSE("GPL"); | |
845 | MODULE_ALIAS("platform:windfarm"); |