Commit | Line | Data |
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6cd32099 BH |
1 | /* |
2 | * Windfarm PowerMac thermal control. | |
3 | * Control loops for PowerMac7,2 and 7,3 | |
4 | * | |
5 | * Copyright (C) 2012 Benjamin Herrenschmidt, IBM Corp. | |
6 | * | |
7 | * Use and redistribute under the terms of the GNU GPL v2. | |
8 | */ | |
9 | #include <linux/types.h> | |
10 | #include <linux/errno.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/device.h> | |
13 | #include <linux/platform_device.h> | |
14 | #include <linux/reboot.h> | |
15 | #include <asm/prom.h> | |
16 | #include <asm/smu.h> | |
17 | ||
18 | #include "windfarm.h" | |
19 | #include "windfarm_pid.h" | |
20 | #include "windfarm_mpu.h" | |
21 | ||
22 | #define VERSION "1.0" | |
23 | ||
24 | #undef DEBUG | |
25 | #undef LOTSA_DEBUG | |
26 | ||
27 | #ifdef DEBUG | |
28 | #define DBG(args...) printk(args) | |
29 | #else | |
30 | #define DBG(args...) do { } while(0) | |
31 | #endif | |
32 | ||
33 | #ifdef LOTSA_DEBUG | |
34 | #define DBG_LOTS(args...) printk(args) | |
35 | #else | |
36 | #define DBG_LOTS(args...) do { } while(0) | |
37 | #endif | |
38 | ||
39 | /* define this to force CPU overtemp to 60 degree, useful for testing | |
40 | * the overtemp code | |
41 | */ | |
42 | #undef HACKED_OVERTEMP | |
43 | ||
44 | /* We currently only handle 2 chips */ | |
45 | #define NR_CHIPS 2 | |
46 | #define NR_CPU_FANS 3 * NR_CHIPS | |
47 | ||
48 | /* Controls and sensors */ | |
49 | static struct wf_sensor *sens_cpu_temp[NR_CHIPS]; | |
50 | static struct wf_sensor *sens_cpu_volts[NR_CHIPS]; | |
51 | static struct wf_sensor *sens_cpu_amps[NR_CHIPS]; | |
52 | static struct wf_sensor *backside_temp; | |
53 | static struct wf_sensor *drives_temp; | |
54 | ||
55 | static struct wf_control *cpu_front_fans[NR_CHIPS]; | |
56 | static struct wf_control *cpu_rear_fans[NR_CHIPS]; | |
57 | static struct wf_control *cpu_pumps[NR_CHIPS]; | |
58 | static struct wf_control *backside_fan; | |
59 | static struct wf_control *drives_fan; | |
60 | static struct wf_control *slots_fan; | |
61 | static struct wf_control *cpufreq_clamp; | |
62 | ||
63 | /* We keep a temperature history for average calculation of 180s */ | |
64 | #define CPU_TEMP_HIST_SIZE 180 | |
65 | ||
66 | /* Fixed speed for slot fan */ | |
67 | #define SLOTS_FAN_DEFAULT_PWM 40 | |
68 | ||
69 | /* Scale value for CPU intake fans */ | |
70 | #define CPU_INTAKE_SCALE 0x0000f852 | |
71 | ||
72 | /* PID loop state */ | |
73 | static const struct mpu_data *cpu_mpu_data[NR_CHIPS]; | |
74 | static struct wf_cpu_pid_state cpu_pid[NR_CHIPS]; | |
75 | static bool cpu_pid_combined; | |
76 | static u32 cpu_thist[CPU_TEMP_HIST_SIZE]; | |
77 | static int cpu_thist_pt; | |
78 | static s64 cpu_thist_total; | |
79 | static s32 cpu_all_tmax = 100 << 16; | |
80 | static struct wf_pid_state backside_pid; | |
81 | static int backside_tick; | |
82 | static struct wf_pid_state drives_pid; | |
83 | static int drives_tick; | |
84 | ||
85 | static int nr_chips; | |
86 | static bool have_all_controls; | |
87 | static bool have_all_sensors; | |
88 | static bool started; | |
89 | ||
90 | static int failure_state; | |
91 | #define FAILURE_SENSOR 1 | |
92 | #define FAILURE_FAN 2 | |
93 | #define FAILURE_PERM 4 | |
94 | #define FAILURE_LOW_OVERTEMP 8 | |
95 | #define FAILURE_HIGH_OVERTEMP 16 | |
96 | ||
97 | /* Overtemp values */ | |
98 | #define LOW_OVER_AVERAGE 0 | |
99 | #define LOW_OVER_IMMEDIATE (10 << 16) | |
100 | #define LOW_OVER_CLEAR ((-10) << 16) | |
101 | #define HIGH_OVER_IMMEDIATE (14 << 16) | |
102 | #define HIGH_OVER_AVERAGE (10 << 16) | |
103 | #define HIGH_OVER_IMMEDIATE (14 << 16) | |
104 | ||
105 | ||
106 | static void cpu_max_all_fans(void) | |
107 | { | |
108 | int i; | |
109 | ||
110 | /* We max all CPU fans in case of a sensor error. We also do the | |
111 | * cpufreq clamping now, even if it's supposedly done later by the | |
112 | * generic code anyway, we do it earlier here to react faster | |
113 | */ | |
114 | if (cpufreq_clamp) | |
115 | wf_control_set_max(cpufreq_clamp); | |
116 | for (i = 0; i < nr_chips; i++) { | |
117 | if (cpu_front_fans[i]) | |
118 | wf_control_set_max(cpu_front_fans[i]); | |
119 | if (cpu_rear_fans[i]) | |
120 | wf_control_set_max(cpu_rear_fans[i]); | |
121 | if (cpu_pumps[i]) | |
122 | wf_control_set_max(cpu_pumps[i]); | |
123 | } | |
124 | } | |
125 | ||
126 | static int cpu_check_overtemp(s32 temp) | |
127 | { | |
128 | int new_state = 0; | |
129 | s32 t_avg, t_old; | |
130 | static bool first = true; | |
131 | ||
132 | /* First check for immediate overtemps */ | |
133 | if (temp >= (cpu_all_tmax + LOW_OVER_IMMEDIATE)) { | |
134 | new_state |= FAILURE_LOW_OVERTEMP; | |
135 | if ((failure_state & FAILURE_LOW_OVERTEMP) == 0) | |
136 | printk(KERN_ERR "windfarm: Overtemp due to immediate CPU" | |
137 | " temperature !\n"); | |
138 | } | |
139 | if (temp >= (cpu_all_tmax + HIGH_OVER_IMMEDIATE)) { | |
140 | new_state |= FAILURE_HIGH_OVERTEMP; | |
141 | if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0) | |
142 | printk(KERN_ERR "windfarm: Critical overtemp due to" | |
143 | " immediate CPU temperature !\n"); | |
144 | } | |
145 | ||
146 | /* | |
147 | * The first time around, initialize the array with the first | |
148 | * temperature reading | |
149 | */ | |
150 | if (first) { | |
151 | int i; | |
152 | ||
153 | cpu_thist_total = 0; | |
154 | for (i = 0; i < CPU_TEMP_HIST_SIZE; i++) { | |
155 | cpu_thist[i] = temp; | |
156 | cpu_thist_total += temp; | |
157 | } | |
158 | first = false; | |
159 | } | |
160 | ||
161 | /* | |
162 | * We calculate a history of max temperatures and use that for the | |
163 | * overtemp management | |
164 | */ | |
165 | t_old = cpu_thist[cpu_thist_pt]; | |
166 | cpu_thist[cpu_thist_pt] = temp; | |
167 | cpu_thist_pt = (cpu_thist_pt + 1) % CPU_TEMP_HIST_SIZE; | |
168 | cpu_thist_total -= t_old; | |
169 | cpu_thist_total += temp; | |
170 | t_avg = cpu_thist_total / CPU_TEMP_HIST_SIZE; | |
171 | ||
172 | DBG_LOTS(" t_avg = %d.%03d (out: %d.%03d, in: %d.%03d)\n", | |
173 | FIX32TOPRINT(t_avg), FIX32TOPRINT(t_old), FIX32TOPRINT(temp)); | |
174 | ||
175 | /* Now check for average overtemps */ | |
176 | if (t_avg >= (cpu_all_tmax + LOW_OVER_AVERAGE)) { | |
177 | new_state |= FAILURE_LOW_OVERTEMP; | |
178 | if ((failure_state & FAILURE_LOW_OVERTEMP) == 0) | |
179 | printk(KERN_ERR "windfarm: Overtemp due to average CPU" | |
180 | " temperature !\n"); | |
181 | } | |
182 | if (t_avg >= (cpu_all_tmax + HIGH_OVER_AVERAGE)) { | |
183 | new_state |= FAILURE_HIGH_OVERTEMP; | |
184 | if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0) | |
185 | printk(KERN_ERR "windfarm: Critical overtemp due to" | |
186 | " average CPU temperature !\n"); | |
187 | } | |
188 | ||
189 | /* Now handle overtemp conditions. We don't currently use the windfarm | |
190 | * overtemp handling core as it's not fully suited to the needs of those | |
191 | * new machine. This will be fixed later. | |
192 | */ | |
193 | if (new_state) { | |
194 | /* High overtemp -> immediate shutdown */ | |
195 | if (new_state & FAILURE_HIGH_OVERTEMP) | |
196 | machine_power_off(); | |
197 | if ((failure_state & new_state) != new_state) | |
198 | cpu_max_all_fans(); | |
199 | failure_state |= new_state; | |
200 | } else if ((failure_state & FAILURE_LOW_OVERTEMP) && | |
201 | (temp < (cpu_all_tmax + LOW_OVER_CLEAR))) { | |
202 | printk(KERN_ERR "windfarm: Overtemp condition cleared !\n"); | |
203 | failure_state &= ~FAILURE_LOW_OVERTEMP; | |
204 | } | |
205 | ||
206 | return failure_state & (FAILURE_LOW_OVERTEMP | FAILURE_HIGH_OVERTEMP); | |
207 | } | |
208 | ||
209 | static int read_one_cpu_vals(int cpu, s32 *temp, s32 *power) | |
210 | { | |
211 | s32 dtemp, volts, amps; | |
212 | int rc; | |
213 | ||
214 | /* Get diode temperature */ | |
215 | rc = wf_sensor_get(sens_cpu_temp[cpu], &dtemp); | |
216 | if (rc) { | |
217 | DBG(" CPU%d: temp reading error !\n", cpu); | |
218 | return -EIO; | |
219 | } | |
220 | DBG_LOTS(" CPU%d: temp = %d.%03d\n", cpu, FIX32TOPRINT((dtemp))); | |
221 | *temp = dtemp; | |
222 | ||
223 | /* Get voltage */ | |
224 | rc = wf_sensor_get(sens_cpu_volts[cpu], &volts); | |
225 | if (rc) { | |
226 | DBG(" CPU%d, volts reading error !\n", cpu); | |
227 | return -EIO; | |
228 | } | |
229 | DBG_LOTS(" CPU%d: volts = %d.%03d\n", cpu, FIX32TOPRINT((volts))); | |
230 | ||
231 | /* Get current */ | |
232 | rc = wf_sensor_get(sens_cpu_amps[cpu], &s); | |
233 | if (rc) { | |
234 | DBG(" CPU%d, current reading error !\n", cpu); | |
235 | return -EIO; | |
236 | } | |
237 | DBG_LOTS(" CPU%d: amps = %d.%03d\n", cpu, FIX32TOPRINT((amps))); | |
238 | ||
239 | /* Calculate power */ | |
240 | ||
241 | /* Scale voltage and current raw sensor values according to fixed scales | |
242 | * obtained in Darwin and calculate power from I and V | |
243 | */ | |
244 | *power = (((u64)volts) * ((u64)amps)) >> 16; | |
245 | ||
246 | DBG_LOTS(" CPU%d: power = %d.%03d\n", cpu, FIX32TOPRINT((*power))); | |
247 | ||
248 | return 0; | |
249 | ||
250 | } | |
251 | ||
252 | static void cpu_fans_tick_split(void) | |
253 | { | |
254 | int err, cpu; | |
255 | s32 intake, temp, power, t_max = 0; | |
256 | ||
257 | DBG_LOTS("* cpu fans_tick_split()\n"); | |
258 | ||
259 | for (cpu = 0; cpu < nr_chips; ++cpu) { | |
260 | struct wf_cpu_pid_state *sp = &cpu_pid[cpu]; | |
261 | ||
262 | /* Read current speed */ | |
263 | wf_control_get(cpu_rear_fans[cpu], &sp->target); | |
264 | ||
265 | DBG_LOTS(" CPU%d: cur_target = %d RPM\n", cpu, sp->target); | |
266 | ||
267 | err = read_one_cpu_vals(cpu, &temp, &power); | |
268 | if (err) { | |
269 | failure_state |= FAILURE_SENSOR; | |
270 | cpu_max_all_fans(); | |
271 | return; | |
272 | } | |
273 | ||
274 | /* Keep track of highest temp */ | |
275 | t_max = max(t_max, temp); | |
276 | ||
277 | /* Handle possible overtemps */ | |
278 | if (cpu_check_overtemp(t_max)) | |
279 | return; | |
280 | ||
281 | /* Run PID */ | |
282 | wf_cpu_pid_run(sp, power, temp); | |
283 | ||
284 | DBG_LOTS(" CPU%d: target = %d RPM\n", cpu, sp->target); | |
285 | ||
286 | /* Apply result directly to exhaust fan */ | |
287 | err = wf_control_set(cpu_rear_fans[cpu], sp->target); | |
288 | if (err) { | |
289 | pr_warning("wf_pm72: Fan %s reports error %d\n", | |
290 | cpu_rear_fans[cpu]->name, err); | |
291 | failure_state |= FAILURE_FAN; | |
292 | break; | |
293 | } | |
294 | ||
295 | /* Scale result for intake fan */ | |
296 | intake = (sp->target * CPU_INTAKE_SCALE) >> 16; | |
297 | DBG_LOTS(" CPU%d: intake = %d RPM\n", cpu, intake); | |
298 | err = wf_control_set(cpu_front_fans[cpu], intake); | |
299 | if (err) { | |
300 | pr_warning("wf_pm72: Fan %s reports error %d\n", | |
301 | cpu_front_fans[cpu]->name, err); | |
302 | failure_state |= FAILURE_FAN; | |
303 | break; | |
304 | } | |
305 | } | |
306 | } | |
307 | ||
308 | static void cpu_fans_tick_combined(void) | |
309 | { | |
310 | s32 temp0, power0, temp1, power1, t_max = 0; | |
311 | s32 temp, power, intake, pump; | |
312 | struct wf_control *pump0, *pump1; | |
313 | struct wf_cpu_pid_state *sp = &cpu_pid[0]; | |
314 | int err, cpu; | |
315 | ||
316 | DBG_LOTS("* cpu fans_tick_combined()\n"); | |
317 | ||
318 | /* Read current speed from cpu 0 */ | |
319 | wf_control_get(cpu_rear_fans[0], &sp->target); | |
320 | ||
321 | DBG_LOTS(" CPUs: cur_target = %d RPM\n", sp->target); | |
322 | ||
323 | /* Read values for both CPUs */ | |
324 | err = read_one_cpu_vals(0, &temp0, &power0); | |
325 | if (err) { | |
326 | failure_state |= FAILURE_SENSOR; | |
327 | cpu_max_all_fans(); | |
328 | return; | |
329 | } | |
330 | err = read_one_cpu_vals(1, &temp1, &power1); | |
331 | if (err) { | |
332 | failure_state |= FAILURE_SENSOR; | |
333 | cpu_max_all_fans(); | |
334 | return; | |
335 | } | |
336 | ||
337 | /* Keep track of highest temp */ | |
338 | t_max = max(t_max, max(temp0, temp1)); | |
339 | ||
340 | /* Handle possible overtemps */ | |
341 | if (cpu_check_overtemp(t_max)) | |
342 | return; | |
343 | ||
344 | /* Use the max temp & power of both */ | |
345 | temp = max(temp0, temp1); | |
346 | power = max(power0, power1); | |
347 | ||
348 | /* Run PID */ | |
349 | wf_cpu_pid_run(sp, power, temp); | |
350 | ||
351 | /* Scale result for intake fan */ | |
352 | intake = (sp->target * CPU_INTAKE_SCALE) >> 16; | |
353 | ||
354 | /* Same deal with pump speed */ | |
355 | pump0 = cpu_pumps[0]; | |
356 | pump1 = cpu_pumps[1]; | |
357 | if (!pump0) { | |
358 | pump0 = pump1; | |
359 | pump1 = NULL; | |
360 | } | |
361 | pump = (sp->target * wf_control_get_max(pump0)) / | |
362 | cpu_mpu_data[0]->rmaxn_exhaust_fan; | |
363 | ||
364 | DBG_LOTS(" CPUs: target = %d RPM\n", sp->target); | |
365 | DBG_LOTS(" CPUs: intake = %d RPM\n", intake); | |
366 | DBG_LOTS(" CPUs: pump = %d RPM\n", pump); | |
367 | ||
368 | for (cpu = 0; cpu < nr_chips; cpu++) { | |
369 | err = wf_control_set(cpu_rear_fans[cpu], sp->target); | |
370 | if (err) { | |
371 | pr_warning("wf_pm72: Fan %s reports error %d\n", | |
372 | cpu_rear_fans[cpu]->name, err); | |
373 | failure_state |= FAILURE_FAN; | |
374 | } | |
375 | err = wf_control_set(cpu_front_fans[cpu], intake); | |
376 | if (err) { | |
377 | pr_warning("wf_pm72: Fan %s reports error %d\n", | |
378 | cpu_front_fans[cpu]->name, err); | |
379 | failure_state |= FAILURE_FAN; | |
380 | } | |
381 | err = 0; | |
382 | if (cpu_pumps[cpu]) | |
383 | err = wf_control_set(cpu_pumps[cpu], pump); | |
384 | if (err) { | |
385 | pr_warning("wf_pm72: Pump %s reports error %d\n", | |
386 | cpu_pumps[cpu]->name, err); | |
387 | failure_state |= FAILURE_FAN; | |
388 | } | |
389 | } | |
390 | } | |
391 | ||
392 | /* Implementation... */ | |
393 | static int cpu_setup_pid(int cpu) | |
394 | { | |
395 | struct wf_cpu_pid_param pid; | |
396 | const struct mpu_data *mpu = cpu_mpu_data[cpu]; | |
397 | s32 tmax, ttarget, ptarget; | |
398 | int fmin, fmax, hsize; | |
399 | ||
400 | /* Get PID params from the appropriate MPU EEPROM */ | |
401 | tmax = mpu->tmax << 16; | |
402 | ttarget = mpu->ttarget << 16; | |
403 | ptarget = ((s32)(mpu->pmaxh - mpu->padjmax)) << 16; | |
404 | ||
405 | DBG("wf_72: CPU%d ttarget = %d.%03d, tmax = %d.%03d\n", | |
406 | cpu, FIX32TOPRINT(ttarget), FIX32TOPRINT(tmax)); | |
407 | ||
408 | /* We keep a global tmax for overtemp calculations */ | |
409 | if (tmax < cpu_all_tmax) | |
410 | cpu_all_tmax = tmax; | |
411 | ||
412 | /* Set PID min/max by using the rear fan min/max */ | |
413 | fmin = wf_control_get_min(cpu_rear_fans[cpu]); | |
414 | fmax = wf_control_get_max(cpu_rear_fans[cpu]); | |
415 | DBG("wf_72: CPU%d max RPM range = [%d..%d]\n", cpu, fmin, fmax); | |
416 | ||
417 | /* History size */ | |
418 | hsize = min_t(int, mpu->tguardband, WF_PID_MAX_HISTORY); | |
419 | DBG("wf_72: CPU%d history size = %d\n", cpu, hsize); | |
420 | ||
421 | /* Initialize PID loop */ | |
422 | pid.interval = 1; /* seconds */ | |
423 | pid.history_len = hsize; | |
424 | pid.gd = mpu->pid_gd; | |
425 | pid.gp = mpu->pid_gp; | |
426 | pid.gr = mpu->pid_gr; | |
427 | pid.tmax = tmax; | |
428 | pid.ttarget = ttarget; | |
429 | pid.pmaxadj = ptarget; | |
430 | pid.min = fmin; | |
431 | pid.max = fmax; | |
432 | ||
433 | wf_cpu_pid_init(&cpu_pid[cpu], &pid); | |
434 | cpu_pid[cpu].target = 1000; | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | /* Backside/U3 fan */ | |
440 | static struct wf_pid_param backside_u3_param = { | |
441 | .interval = 5, | |
442 | .history_len = 2, | |
443 | .gd = 40 << 20, | |
444 | .gp = 5 << 20, | |
445 | .gr = 0, | |
446 | .itarget = 65 << 16, | |
447 | .additive = 1, | |
448 | .min = 20, | |
449 | .max = 100, | |
450 | }; | |
451 | ||
452 | static struct wf_pid_param backside_u3h_param = { | |
453 | .interval = 5, | |
454 | .history_len = 2, | |
455 | .gd = 20 << 20, | |
456 | .gp = 5 << 20, | |
457 | .gr = 0, | |
458 | .itarget = 75 << 16, | |
459 | .additive = 1, | |
460 | .min = 20, | |
461 | .max = 100, | |
462 | }; | |
463 | ||
464 | static void backside_fan_tick(void) | |
465 | { | |
466 | s32 temp; | |
467 | int speed; | |
468 | int err; | |
469 | ||
470 | if (!backside_fan || !backside_temp || !backside_tick) | |
471 | return; | |
472 | if (--backside_tick > 0) | |
473 | return; | |
474 | backside_tick = backside_pid.param.interval; | |
475 | ||
476 | DBG_LOTS("* backside fans tick\n"); | |
477 | ||
478 | /* Update fan speed from actual fans */ | |
479 | err = wf_control_get(backside_fan, &speed); | |
480 | if (!err) | |
481 | backside_pid.target = speed; | |
482 | ||
483 | err = wf_sensor_get(backside_temp, &temp); | |
484 | if (err) { | |
485 | printk(KERN_WARNING "windfarm: U4 temp sensor error %d\n", | |
486 | err); | |
487 | failure_state |= FAILURE_SENSOR; | |
488 | wf_control_set_max(backside_fan); | |
489 | return; | |
490 | } | |
491 | speed = wf_pid_run(&backside_pid, temp); | |
492 | ||
493 | DBG_LOTS("backside PID temp=%d.%.3d speed=%d\n", | |
494 | FIX32TOPRINT(temp), speed); | |
495 | ||
496 | err = wf_control_set(backside_fan, speed); | |
497 | if (err) { | |
498 | printk(KERN_WARNING "windfarm: backside fan error %d\n", err); | |
499 | failure_state |= FAILURE_FAN; | |
500 | } | |
501 | } | |
502 | ||
503 | static void backside_setup_pid(void) | |
504 | { | |
505 | /* first time initialize things */ | |
506 | s32 fmin = wf_control_get_min(backside_fan); | |
507 | s32 fmax = wf_control_get_max(backside_fan); | |
508 | struct wf_pid_param param; | |
509 | struct device_node *u3; | |
510 | int u3h = 1; /* conservative by default */ | |
511 | ||
512 | u3 = of_find_node_by_path("/u3@0,f8000000"); | |
513 | if (u3 != NULL) { | |
514 | const u32 *vers = of_get_property(u3, "device-rev", NULL); | |
515 | if (vers) | |
516 | if (((*vers) & 0x3f) < 0x34) | |
517 | u3h = 0; | |
518 | of_node_put(u3); | |
519 | } | |
520 | ||
521 | param = u3h ? backside_u3h_param : backside_u3_param; | |
522 | ||
523 | param.min = max(param.min, fmin); | |
524 | param.max = min(param.max, fmax); | |
525 | wf_pid_init(&backside_pid, ¶m); | |
526 | backside_tick = 1; | |
527 | ||
528 | pr_info("wf_pm72: Backside control loop started.\n"); | |
529 | } | |
530 | ||
531 | /* Drive bay fan */ | |
532 | static const struct wf_pid_param drives_param = { | |
533 | .interval = 5, | |
534 | .history_len = 2, | |
535 | .gd = 30 << 20, | |
536 | .gp = 5 << 20, | |
537 | .gr = 0, | |
538 | .itarget = 40 << 16, | |
539 | .additive = 1, | |
540 | .min = 300, | |
541 | .max = 4000, | |
542 | }; | |
543 | ||
544 | static void drives_fan_tick(void) | |
545 | { | |
546 | s32 temp; | |
547 | int speed; | |
548 | int err; | |
549 | ||
550 | if (!drives_fan || !drives_temp || !drives_tick) | |
551 | return; | |
552 | if (--drives_tick > 0) | |
553 | return; | |
554 | drives_tick = drives_pid.param.interval; | |
555 | ||
556 | DBG_LOTS("* drives fans tick\n"); | |
557 | ||
558 | /* Update fan speed from actual fans */ | |
559 | err = wf_control_get(drives_fan, &speed); | |
560 | if (!err) | |
561 | drives_pid.target = speed; | |
562 | ||
563 | err = wf_sensor_get(drives_temp, &temp); | |
564 | if (err) { | |
565 | pr_warning("wf_pm72: drive bay temp sensor error %d\n", err); | |
566 | failure_state |= FAILURE_SENSOR; | |
567 | wf_control_set_max(drives_fan); | |
568 | return; | |
569 | } | |
570 | speed = wf_pid_run(&drives_pid, temp); | |
571 | ||
572 | DBG_LOTS("drives PID temp=%d.%.3d speed=%d\n", | |
573 | FIX32TOPRINT(temp), speed); | |
574 | ||
575 | err = wf_control_set(drives_fan, speed); | |
576 | if (err) { | |
577 | printk(KERN_WARNING "windfarm: drive bay fan error %d\n", err); | |
578 | failure_state |= FAILURE_FAN; | |
579 | } | |
580 | } | |
581 | ||
582 | static void drives_setup_pid(void) | |
583 | { | |
584 | /* first time initialize things */ | |
585 | s32 fmin = wf_control_get_min(drives_fan); | |
586 | s32 fmax = wf_control_get_max(drives_fan); | |
587 | struct wf_pid_param param = drives_param; | |
588 | ||
589 | param.min = max(param.min, fmin); | |
590 | param.max = min(param.max, fmax); | |
591 | wf_pid_init(&drives_pid, ¶m); | |
592 | drives_tick = 1; | |
593 | ||
594 | pr_info("wf_pm72: Drive bay control loop started.\n"); | |
595 | } | |
596 | ||
597 | static void set_fail_state(void) | |
598 | { | |
599 | cpu_max_all_fans(); | |
600 | ||
601 | if (backside_fan) | |
602 | wf_control_set_max(backside_fan); | |
603 | if (slots_fan) | |
604 | wf_control_set_max(slots_fan); | |
605 | if (drives_fan) | |
606 | wf_control_set_max(drives_fan); | |
607 | } | |
608 | ||
609 | static void pm72_tick(void) | |
610 | { | |
611 | int i, last_failure; | |
612 | ||
613 | if (!started) { | |
614 | started = 1; | |
615 | printk(KERN_INFO "windfarm: CPUs control loops started.\n"); | |
616 | for (i = 0; i < nr_chips; ++i) { | |
617 | if (cpu_setup_pid(i) < 0) { | |
618 | failure_state = FAILURE_PERM; | |
619 | set_fail_state(); | |
620 | break; | |
621 | } | |
622 | } | |
623 | DBG_LOTS("cpu_all_tmax=%d.%03d\n", FIX32TOPRINT(cpu_all_tmax)); | |
624 | ||
625 | backside_setup_pid(); | |
626 | drives_setup_pid(); | |
627 | ||
628 | /* | |
629 | * We don't have the right stuff to drive the PCI fan | |
630 | * so we fix it to a default value | |
631 | */ | |
632 | wf_control_set(slots_fan, SLOTS_FAN_DEFAULT_PWM); | |
633 | ||
634 | #ifdef HACKED_OVERTEMP | |
635 | cpu_all_tmax = 60 << 16; | |
636 | #endif | |
637 | } | |
638 | ||
639 | /* Permanent failure, bail out */ | |
640 | if (failure_state & FAILURE_PERM) | |
641 | return; | |
642 | ||
643 | /* | |
644 | * Clear all failure bits except low overtemp which will be eventually | |
645 | * cleared by the control loop itself | |
646 | */ | |
647 | last_failure = failure_state; | |
648 | failure_state &= FAILURE_LOW_OVERTEMP; | |
649 | if (cpu_pid_combined) | |
650 | cpu_fans_tick_combined(); | |
651 | else | |
652 | cpu_fans_tick_split(); | |
653 | backside_fan_tick(); | |
654 | drives_fan_tick(); | |
655 | ||
656 | DBG_LOTS(" last_failure: 0x%x, failure_state: %x\n", | |
657 | last_failure, failure_state); | |
658 | ||
659 | /* Check for failures. Any failure causes cpufreq clamping */ | |
660 | if (failure_state && last_failure == 0 && cpufreq_clamp) | |
661 | wf_control_set_max(cpufreq_clamp); | |
662 | if (failure_state == 0 && last_failure && cpufreq_clamp) | |
663 | wf_control_set_min(cpufreq_clamp); | |
664 | ||
665 | /* That's it for now, we might want to deal with other failures | |
666 | * differently in the future though | |
667 | */ | |
668 | } | |
669 | ||
670 | static void pm72_new_control(struct wf_control *ct) | |
671 | { | |
672 | bool all_controls; | |
673 | bool had_pump = cpu_pumps[0] || cpu_pumps[1]; | |
674 | ||
675 | if (!strcmp(ct->name, "cpu-front-fan-0")) | |
676 | cpu_front_fans[0] = ct; | |
677 | else if (!strcmp(ct->name, "cpu-front-fan-1")) | |
678 | cpu_front_fans[1] = ct; | |
679 | else if (!strcmp(ct->name, "cpu-rear-fan-0")) | |
680 | cpu_rear_fans[0] = ct; | |
681 | else if (!strcmp(ct->name, "cpu-rear-fan-1")) | |
682 | cpu_rear_fans[1] = ct; | |
683 | else if (!strcmp(ct->name, "cpu-pump-0")) | |
684 | cpu_pumps[0] = ct; | |
685 | else if (!strcmp(ct->name, "cpu-pump-1")) | |
686 | cpu_pumps[1] = ct; | |
687 | else if (!strcmp(ct->name, "backside-fan")) | |
688 | backside_fan = ct; | |
689 | else if (!strcmp(ct->name, "slots-fan")) | |
690 | slots_fan = ct; | |
691 | else if (!strcmp(ct->name, "drive-bay-fan")) | |
692 | drives_fan = ct; | |
693 | else if (!strcmp(ct->name, "cpufreq-clamp")) | |
694 | cpufreq_clamp = ct; | |
695 | ||
696 | all_controls = | |
697 | cpu_front_fans[0] && | |
698 | cpu_rear_fans[0] && | |
699 | backside_fan && | |
700 | slots_fan && | |
701 | drives_fan; | |
702 | if (nr_chips > 1) | |
703 | all_controls &= | |
704 | cpu_front_fans[1] && | |
705 | cpu_rear_fans[1]; | |
706 | have_all_controls = all_controls; | |
707 | ||
708 | if ((cpu_pumps[0] || cpu_pumps[1]) && !had_pump) { | |
709 | pr_info("wf_pm72: Liquid cooling pump(s) detected," | |
710 | " using new algorithm !\n"); | |
711 | cpu_pid_combined = true; | |
712 | } | |
713 | } | |
714 | ||
715 | ||
716 | static void pm72_new_sensor(struct wf_sensor *sr) | |
717 | { | |
718 | bool all_sensors; | |
719 | ||
720 | if (!strcmp(sr->name, "cpu-diode-temp-0")) | |
721 | sens_cpu_temp[0] = sr; | |
722 | else if (!strcmp(sr->name, "cpu-diode-temp-1")) | |
723 | sens_cpu_temp[1] = sr; | |
724 | else if (!strcmp(sr->name, "cpu-voltage-0")) | |
725 | sens_cpu_volts[0] = sr; | |
726 | else if (!strcmp(sr->name, "cpu-voltage-1")) | |
727 | sens_cpu_volts[1] = sr; | |
728 | else if (!strcmp(sr->name, "cpu-current-0")) | |
729 | sens_cpu_amps[0] = sr; | |
730 | else if (!strcmp(sr->name, "cpu-current-1")) | |
731 | sens_cpu_amps[1] = sr; | |
732 | else if (!strcmp(sr->name, "backside-temp")) | |
733 | backside_temp = sr; | |
734 | else if (!strcmp(sr->name, "hd-temp")) | |
735 | drives_temp = sr; | |
736 | ||
737 | all_sensors = | |
738 | sens_cpu_temp[0] && | |
739 | sens_cpu_volts[0] && | |
740 | sens_cpu_amps[0] && | |
741 | backside_temp && | |
742 | drives_temp; | |
743 | if (nr_chips > 1) | |
744 | all_sensors &= | |
745 | sens_cpu_temp[1] && | |
746 | sens_cpu_volts[1] && | |
747 | sens_cpu_amps[1]; | |
748 | ||
749 | have_all_sensors = all_sensors; | |
750 | } | |
751 | ||
752 | static int pm72_wf_notify(struct notifier_block *self, | |
753 | unsigned long event, void *data) | |
754 | { | |
755 | switch (event) { | |
756 | case WF_EVENT_NEW_SENSOR: | |
757 | pm72_new_sensor(data); | |
758 | break; | |
759 | case WF_EVENT_NEW_CONTROL: | |
760 | pm72_new_control(data); | |
761 | break; | |
762 | case WF_EVENT_TICK: | |
763 | if (have_all_controls && have_all_sensors) | |
764 | pm72_tick(); | |
765 | } | |
766 | return 0; | |
767 | } | |
768 | ||
769 | static struct notifier_block pm72_events = { | |
770 | .notifier_call = pm72_wf_notify, | |
771 | }; | |
772 | ||
773 | static int wf_pm72_probe(struct platform_device *dev) | |
774 | { | |
775 | wf_register_client(&pm72_events); | |
776 | return 0; | |
777 | } | |
778 | ||
1da42fb6 | 779 | static int wf_pm72_remove(struct platform_device *dev) |
6cd32099 BH |
780 | { |
781 | wf_unregister_client(&pm72_events); | |
782 | ||
783 | /* should release all sensors and controls */ | |
784 | return 0; | |
785 | } | |
786 | ||
787 | static struct platform_driver wf_pm72_driver = { | |
788 | .probe = wf_pm72_probe, | |
789 | .remove = wf_pm72_remove, | |
790 | .driver = { | |
791 | .name = "windfarm", | |
792 | .owner = THIS_MODULE, | |
793 | }, | |
794 | }; | |
795 | ||
796 | static int __init wf_pm72_init(void) | |
797 | { | |
798 | struct device_node *cpu; | |
799 | int i; | |
800 | ||
801 | if (!of_machine_is_compatible("PowerMac7,2") && | |
802 | !of_machine_is_compatible("PowerMac7,3")) | |
803 | return -ENODEV; | |
804 | ||
805 | /* Count the number of CPU cores */ | |
806 | nr_chips = 0; | |
c7c360ee | 807 | for_each_node_by_type(cpu, "cpu") |
6cd32099 BH |
808 | ++nr_chips; |
809 | if (nr_chips > NR_CHIPS) | |
810 | nr_chips = NR_CHIPS; | |
811 | ||
812 | pr_info("windfarm: Initializing for desktop G5 with %d chips\n", | |
813 | nr_chips); | |
814 | ||
815 | /* Get MPU data for each CPU */ | |
816 | for (i = 0; i < nr_chips; i++) { | |
817 | cpu_mpu_data[i] = wf_get_mpu(i); | |
818 | if (!cpu_mpu_data[i]) { | |
819 | pr_err("wf_pm72: Failed to find MPU data for CPU %d\n", i); | |
820 | return -ENXIO; | |
821 | } | |
822 | } | |
823 | ||
824 | #ifdef MODULE | |
825 | request_module("windfarm_fcu_controls"); | |
826 | request_module("windfarm_lm75_sensor"); | |
827 | request_module("windfarm_ad7417_sensor"); | |
828 | request_module("windfarm_max6690_sensor"); | |
829 | request_module("windfarm_cpufreq_clamp"); | |
830 | #endif /* MODULE */ | |
831 | ||
832 | platform_driver_register(&wf_pm72_driver); | |
833 | return 0; | |
834 | } | |
835 | ||
836 | static void __exit wf_pm72_exit(void) | |
837 | { | |
838 | platform_driver_unregister(&wf_pm72_driver); | |
839 | } | |
840 | ||
841 | module_init(wf_pm72_init); | |
842 | module_exit(wf_pm72_exit); | |
843 | ||
844 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
845 | MODULE_DESCRIPTION("Thermal control for AGP PowerMac G5s"); | |
846 | MODULE_LICENSE("GPL"); | |
847 | MODULE_ALIAS("platform:windfarm"); |