Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Device driver for the thermostats & fan controller of the | |
3 | * Apple G5 "PowerMac7,2" desktop machines. | |
4 | * | |
5 | * (c) Copyright IBM Corp. 2003-2004 | |
6 | * | |
7 | * Maintained by: Benjamin Herrenschmidt | |
8 | * <benh@kernel.crashing.org> | |
9 | * | |
10 | * | |
11 | * The algorithm used is the PID control algorithm, used the same | |
12 | * way the published Darwin code does, using the same values that | |
13 | * are present in the Darwin 7.0 snapshot property lists. | |
14 | * | |
15 | * As far as the CPUs control loops are concerned, I use the | |
16 | * calibration & PID constants provided by the EEPROM, | |
17 | * I do _not_ embed any value from the property lists, as the ones | |
18 | * provided by Darwin 7.0 seem to always have an older version that | |
19 | * what I've seen on the actual computers. | |
20 | * It would be interesting to verify that though. Darwin has a | |
21 | * version code of 1.0.0d11 for all control loops it seems, while | |
22 | * so far, the machines EEPROMs contain a dataset versioned 1.0.0f | |
23 | * | |
24 | * Darwin doesn't provide source to all parts, some missing | |
25 | * bits like the AppleFCU driver or the actual scale of some | |
26 | * of the values returned by sensors had to be "guessed" some | |
27 | * way... or based on what Open Firmware does. | |
28 | * | |
29 | * I didn't yet figure out how to get the slots power consumption | |
30 | * out of the FCU, so that part has not been implemented yet and | |
31 | * the slots fan is set to a fixed 50% PWM, hoping this value is | |
32 | * safe enough ... | |
33 | * | |
34 | * Note: I have observed strange oscillations of the CPU control | |
35 | * loop on a dual G5 here. When idle, the CPU exhaust fan tend to | |
36 | * oscillates slowly (over several minutes) between the minimum | |
37 | * of 300RPMs and approx. 1000 RPMs. I don't know what is causing | |
38 | * this, it could be some incorrect constant or an error in the | |
39 | * way I ported the algorithm, or it could be just normal. I | |
40 | * don't have full understanding on the way Apple tweaked the PID | |
41 | * algorithm for the CPU control, it is definitely not a standard | |
42 | * implementation... | |
43 | * | |
44 | * TODO: - Check MPU structure version/signature | |
45 | * - Add things like /sbin/overtemp for non-critical | |
46 | * overtemp conditions so userland can take some policy | |
47 | * decisions, like slewing down CPUs | |
48 | * - Deal with fan and i2c failures in a better way | |
49 | * - Maybe do a generic PID based on params used for | |
50 | * U3 and Drives ? Definitely need to factor code a bit | |
51 | * bettter... also make sensor detection more robust using | |
52 | * the device-tree to probe for them | |
53 | * - Figure out how to get the slots consumption and set the | |
54 | * slots fan accordingly | |
55 | * | |
56 | * History: | |
57 | * | |
58 | * Nov. 13, 2003 : 0.5 | |
59 | * - First release | |
60 | * | |
61 | * Nov. 14, 2003 : 0.6 | |
62 | * - Read fan speed from FCU, low level fan routines now deal | |
63 | * with errors & check fan status, though higher level don't | |
64 | * do much. | |
65 | * - Move a bunch of definitions to .h file | |
66 | * | |
67 | * Nov. 18, 2003 : 0.7 | |
68 | * - Fix build on ppc64 kernel | |
69 | * - Move back statics definitions to .c file | |
70 | * - Avoid calling schedule_timeout with a negative number | |
71 | * | |
72 | * Dec. 18, 2003 : 0.8 | |
73 | * - Fix typo when reading back fan speed on 2 CPU machines | |
74 | * | |
75 | * Mar. 11, 2004 : 0.9 | |
76 | * - Rework code accessing the ADC chips, make it more robust and | |
77 | * closer to the chip spec. Also make sure it is configured properly, | |
78 | * I've seen yet unexplained cases where on startup, I would have stale | |
79 | * values in the configuration register | |
80 | * - Switch back to use of target fan speed for PID, thus lowering | |
81 | * pressure on i2c | |
82 | * | |
83 | * Oct. 20, 2004 : 1.1 | |
84 | * - Add device-tree lookup for fan IDs, should detect liquid cooling | |
85 | * pumps when present | |
86 | * - Enable driver for PowerMac7,3 machines | |
87 | * - Split the U3/Backside cooling on U3 & U3H versions as Darwin does | |
88 | * - Add new CPU cooling algorithm for machines with liquid cooling | |
89 | * - Workaround for some PowerMac7,3 with empty "fan" node in the devtree | |
90 | * - Fix a signed/unsigned compare issue in some PID loops | |
91 | * | |
92 | * Mar. 10, 2005 : 1.2 | |
93 | * - Add basic support for Xserve G5 | |
94 | * - Retreive pumps min/max from EEPROM image in device-tree (broken) | |
95 | * - Use min/max macros here or there | |
96 | * - Latest darwin updated U3H min fan speed to 20% PWM | |
97 | * | |
861fa773 BH |
98 | * July. 06, 2006 : 1.3 |
99 | * - Fix setting of RPM fans on Xserve G5 (they were going too fast) | |
100 | * - Add missing slots fan control loop for Xserve G5 | |
101 | * - Lower fixed slots fan speed from 50% to 40% on desktop G5s. We | |
102 | * still can't properly implement the control loop for these, so let's | |
103 | * reduce the noise a little bit, it appears that 40% still gives us | |
104 | * a pretty good air flow | |
105 | * - Add code to "tickle" the FCU regulary so it doesn't think that | |
106 | * we are gone while in fact, the machine just didn't need any fan | |
107 | * speed change lately | |
108 | * | |
1da177e4 LT |
109 | */ |
110 | ||
1da177e4 LT |
111 | #include <linux/types.h> |
112 | #include <linux/module.h> | |
113 | #include <linux/errno.h> | |
114 | #include <linux/kernel.h> | |
115 | #include <linux/delay.h> | |
116 | #include <linux/sched.h> | |
1da177e4 LT |
117 | #include <linux/slab.h> |
118 | #include <linux/init.h> | |
119 | #include <linux/spinlock.h> | |
1da177e4 LT |
120 | #include <linux/wait.h> |
121 | #include <linux/reboot.h> | |
122 | #include <linux/kmod.h> | |
123 | #include <linux/i2c.h> | |
39d183d8 | 124 | #include <linux/kthread.h> |
0885cb56 | 125 | #include <linux/mutex.h> |
ad9e05ae SR |
126 | #include <linux/of_device.h> |
127 | #include <linux/of_platform.h> | |
1da177e4 LT |
128 | #include <asm/prom.h> |
129 | #include <asm/machdep.h> | |
130 | #include <asm/io.h> | |
131 | #include <asm/system.h> | |
132 | #include <asm/sections.h> | |
5e655772 | 133 | #include <asm/macio.h> |
1da177e4 LT |
134 | |
135 | #include "therm_pm72.h" | |
136 | ||
861fa773 | 137 | #define VERSION "1.3" |
1da177e4 LT |
138 | |
139 | #undef DEBUG | |
140 | ||
141 | #ifdef DEBUG | |
142 | #define DBG(args...) printk(args) | |
143 | #else | |
144 | #define DBG(args...) do { } while(0) | |
145 | #endif | |
146 | ||
147 | ||
148 | /* | |
149 | * Driver statics | |
150 | */ | |
151 | ||
152 | static struct of_device * of_dev; | |
153 | static struct i2c_adapter * u3_0; | |
154 | static struct i2c_adapter * u3_1; | |
155 | static struct i2c_adapter * k2; | |
156 | static struct i2c_client * fcu; | |
157 | static struct cpu_pid_state cpu_state[2]; | |
158 | static struct basckside_pid_params backside_params; | |
159 | static struct backside_pid_state backside_state; | |
160 | static struct drives_pid_state drives_state; | |
161 | static struct dimm_pid_state dimms_state; | |
861fa773 | 162 | static struct slots_pid_state slots_state; |
1da177e4 LT |
163 | static int state; |
164 | static int cpu_count; | |
165 | static int cpu_pid_type; | |
39d183d8 | 166 | static struct task_struct *ctrl_task; |
1da177e4 LT |
167 | static struct completion ctrl_complete; |
168 | static int critical_state; | |
169 | static int rackmac; | |
170 | static s32 dimm_output_clamp; | |
861fa773 BH |
171 | static int fcu_rpm_shift; |
172 | static int fcu_tickle_ticks; | |
0885cb56 | 173 | static DEFINE_MUTEX(driver_lock); |
1da177e4 LT |
174 | |
175 | /* | |
176 | * We have 3 types of CPU PID control. One is "split" old style control | |
177 | * for intake & exhaust fans, the other is "combined" control for both | |
178 | * CPUs that also deals with the pumps when present. To be "compatible" | |
179 | * with OS X at this point, we only use "COMBINED" on the machines that | |
180 | * are identified as having the pumps (though that identification is at | |
181 | * least dodgy). Ultimately, we could probably switch completely to this | |
182 | * algorithm provided we hack it to deal with the UP case | |
183 | */ | |
184 | #define CPU_PID_TYPE_SPLIT 0 | |
185 | #define CPU_PID_TYPE_COMBINED 1 | |
186 | #define CPU_PID_TYPE_RACKMAC 2 | |
187 | ||
188 | /* | |
189 | * This table describes all fans in the FCU. The "id" and "type" values | |
190 | * are defaults valid for all earlier machines. Newer machines will | |
191 | * eventually override the table content based on the device-tree | |
192 | */ | |
193 | struct fcu_fan_table | |
194 | { | |
195 | char* loc; /* location code */ | |
196 | int type; /* 0 = rpm, 1 = pwm, 2 = pump */ | |
197 | int id; /* id or -1 */ | |
198 | }; | |
199 | ||
200 | #define FCU_FAN_RPM 0 | |
201 | #define FCU_FAN_PWM 1 | |
202 | ||
203 | #define FCU_FAN_ABSENT_ID -1 | |
204 | ||
205 | #define FCU_FAN_COUNT ARRAY_SIZE(fcu_fans) | |
206 | ||
207 | struct fcu_fan_table fcu_fans[] = { | |
208 | [BACKSIDE_FAN_PWM_INDEX] = { | |
209 | .loc = "BACKSIDE,SYS CTRLR FAN", | |
210 | .type = FCU_FAN_PWM, | |
211 | .id = BACKSIDE_FAN_PWM_DEFAULT_ID, | |
212 | }, | |
213 | [DRIVES_FAN_RPM_INDEX] = { | |
214 | .loc = "DRIVE BAY", | |
215 | .type = FCU_FAN_RPM, | |
216 | .id = DRIVES_FAN_RPM_DEFAULT_ID, | |
217 | }, | |
218 | [SLOTS_FAN_PWM_INDEX] = { | |
219 | .loc = "SLOT,PCI FAN", | |
220 | .type = FCU_FAN_PWM, | |
221 | .id = SLOTS_FAN_PWM_DEFAULT_ID, | |
222 | }, | |
223 | [CPUA_INTAKE_FAN_RPM_INDEX] = { | |
224 | .loc = "CPU A INTAKE", | |
225 | .type = FCU_FAN_RPM, | |
226 | .id = CPUA_INTAKE_FAN_RPM_DEFAULT_ID, | |
227 | }, | |
228 | [CPUA_EXHAUST_FAN_RPM_INDEX] = { | |
229 | .loc = "CPU A EXHAUST", | |
230 | .type = FCU_FAN_RPM, | |
231 | .id = CPUA_EXHAUST_FAN_RPM_DEFAULT_ID, | |
232 | }, | |
233 | [CPUB_INTAKE_FAN_RPM_INDEX] = { | |
234 | .loc = "CPU B INTAKE", | |
235 | .type = FCU_FAN_RPM, | |
236 | .id = CPUB_INTAKE_FAN_RPM_DEFAULT_ID, | |
237 | }, | |
238 | [CPUB_EXHAUST_FAN_RPM_INDEX] = { | |
239 | .loc = "CPU B EXHAUST", | |
240 | .type = FCU_FAN_RPM, | |
241 | .id = CPUB_EXHAUST_FAN_RPM_DEFAULT_ID, | |
242 | }, | |
243 | /* pumps aren't present by default, have to be looked up in the | |
244 | * device-tree | |
245 | */ | |
246 | [CPUA_PUMP_RPM_INDEX] = { | |
247 | .loc = "CPU A PUMP", | |
248 | .type = FCU_FAN_RPM, | |
249 | .id = FCU_FAN_ABSENT_ID, | |
250 | }, | |
251 | [CPUB_PUMP_RPM_INDEX] = { | |
252 | .loc = "CPU B PUMP", | |
253 | .type = FCU_FAN_RPM, | |
254 | .id = FCU_FAN_ABSENT_ID, | |
255 | }, | |
256 | /* Xserve fans */ | |
257 | [CPU_A1_FAN_RPM_INDEX] = { | |
258 | .loc = "CPU A 1", | |
259 | .type = FCU_FAN_RPM, | |
260 | .id = FCU_FAN_ABSENT_ID, | |
261 | }, | |
262 | [CPU_A2_FAN_RPM_INDEX] = { | |
263 | .loc = "CPU A 2", | |
264 | .type = FCU_FAN_RPM, | |
265 | .id = FCU_FAN_ABSENT_ID, | |
266 | }, | |
267 | [CPU_A3_FAN_RPM_INDEX] = { | |
268 | .loc = "CPU A 3", | |
269 | .type = FCU_FAN_RPM, | |
270 | .id = FCU_FAN_ABSENT_ID, | |
271 | }, | |
272 | [CPU_B1_FAN_RPM_INDEX] = { | |
273 | .loc = "CPU B 1", | |
274 | .type = FCU_FAN_RPM, | |
275 | .id = FCU_FAN_ABSENT_ID, | |
276 | }, | |
277 | [CPU_B2_FAN_RPM_INDEX] = { | |
278 | .loc = "CPU B 2", | |
279 | .type = FCU_FAN_RPM, | |
280 | .id = FCU_FAN_ABSENT_ID, | |
281 | }, | |
282 | [CPU_B3_FAN_RPM_INDEX] = { | |
283 | .loc = "CPU B 3", | |
284 | .type = FCU_FAN_RPM, | |
285 | .id = FCU_FAN_ABSENT_ID, | |
286 | }, | |
287 | }; | |
288 | ||
289 | /* | |
290 | * i2c_driver structure to attach to the host i2c controller | |
291 | */ | |
292 | ||
293 | static int therm_pm72_attach(struct i2c_adapter *adapter); | |
294 | static int therm_pm72_detach(struct i2c_adapter *adapter); | |
295 | ||
296 | static struct i2c_driver therm_pm72_driver = | |
297 | { | |
a33ca232 | 298 | .driver = { |
a33ca232 LR |
299 | .name = "therm_pm72", |
300 | }, | |
1da177e4 LT |
301 | .attach_adapter = therm_pm72_attach, |
302 | .detach_adapter = therm_pm72_detach, | |
303 | }; | |
304 | ||
305 | /* | |
306 | * Utility function to create an i2c_client structure and | |
307 | * attach it to one of u3 adapters | |
308 | */ | |
309 | static struct i2c_client *attach_i2c_chip(int id, const char *name) | |
310 | { | |
311 | struct i2c_client *clt; | |
312 | struct i2c_adapter *adap; | |
313 | ||
314 | if (id & 0x200) | |
315 | adap = k2; | |
316 | else if (id & 0x100) | |
317 | adap = u3_1; | |
318 | else | |
319 | adap = u3_0; | |
320 | if (adap == NULL) | |
321 | return NULL; | |
322 | ||
dd00cc48 | 323 | clt = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); |
1da177e4 LT |
324 | if (clt == NULL) |
325 | return NULL; | |
1da177e4 LT |
326 | |
327 | clt->addr = (id >> 1) & 0x7f; | |
328 | clt->adapter = adap; | |
329 | clt->driver = &therm_pm72_driver; | |
330 | strncpy(clt->name, name, I2C_NAME_SIZE-1); | |
331 | ||
332 | if (i2c_attach_client(clt)) { | |
333 | printk(KERN_ERR "therm_pm72: Failed to attach to i2c ID 0x%x\n", id); | |
334 | kfree(clt); | |
335 | return NULL; | |
336 | } | |
337 | return clt; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Utility function to get rid of the i2c_client structure | |
342 | * (will also detach from the adapter hopepfully) | |
343 | */ | |
344 | static void detach_i2c_chip(struct i2c_client *clt) | |
345 | { | |
346 | i2c_detach_client(clt); | |
347 | kfree(clt); | |
348 | } | |
349 | ||
350 | /* | |
351 | * Here are the i2c chip access wrappers | |
352 | */ | |
353 | ||
354 | static void initialize_adc(struct cpu_pid_state *state) | |
355 | { | |
356 | int rc; | |
357 | u8 buf[2]; | |
358 | ||
359 | /* Read ADC the configuration register and cache it. We | |
360 | * also make sure Config2 contains proper values, I've seen | |
361 | * cases where we got stale grabage in there, thus preventing | |
362 | * proper reading of conv. values | |
363 | */ | |
364 | ||
365 | /* Clear Config2 */ | |
366 | buf[0] = 5; | |
367 | buf[1] = 0; | |
368 | i2c_master_send(state->monitor, buf, 2); | |
369 | ||
370 | /* Read & cache Config1 */ | |
371 | buf[0] = 1; | |
372 | rc = i2c_master_send(state->monitor, buf, 1); | |
373 | if (rc > 0) { | |
374 | rc = i2c_master_recv(state->monitor, buf, 1); | |
375 | if (rc > 0) { | |
376 | state->adc_config = buf[0]; | |
377 | DBG("ADC config reg: %02x\n", state->adc_config); | |
378 | /* Disable shutdown mode */ | |
379 | state->adc_config &= 0xfe; | |
380 | buf[0] = 1; | |
381 | buf[1] = state->adc_config; | |
382 | rc = i2c_master_send(state->monitor, buf, 2); | |
383 | } | |
384 | } | |
385 | if (rc <= 0) | |
386 | printk(KERN_ERR "therm_pm72: Error reading ADC config" | |
387 | " register !\n"); | |
388 | } | |
389 | ||
390 | static int read_smon_adc(struct cpu_pid_state *state, int chan) | |
391 | { | |
392 | int rc, data, tries = 0; | |
393 | u8 buf[2]; | |
394 | ||
395 | for (;;) { | |
396 | /* Set channel */ | |
397 | buf[0] = 1; | |
398 | buf[1] = (state->adc_config & 0x1f) | (chan << 5); | |
399 | rc = i2c_master_send(state->monitor, buf, 2); | |
400 | if (rc <= 0) | |
401 | goto error; | |
402 | /* Wait for convertion */ | |
403 | msleep(1); | |
404 | /* Switch to data register */ | |
405 | buf[0] = 4; | |
406 | rc = i2c_master_send(state->monitor, buf, 1); | |
407 | if (rc <= 0) | |
408 | goto error; | |
409 | /* Read result */ | |
410 | rc = i2c_master_recv(state->monitor, buf, 2); | |
411 | if (rc < 0) | |
412 | goto error; | |
413 | data = ((u16)buf[0]) << 8 | (u16)buf[1]; | |
414 | return data >> 6; | |
415 | error: | |
416 | DBG("Error reading ADC, retrying...\n"); | |
417 | if (++tries > 10) { | |
418 | printk(KERN_ERR "therm_pm72: Error reading ADC !\n"); | |
419 | return -1; | |
420 | } | |
421 | msleep(10); | |
422 | } | |
423 | } | |
424 | ||
425 | static int read_lm87_reg(struct i2c_client * chip, int reg) | |
426 | { | |
427 | int rc, tries = 0; | |
428 | u8 buf; | |
429 | ||
430 | for (;;) { | |
431 | /* Set address */ | |
432 | buf = (u8)reg; | |
433 | rc = i2c_master_send(chip, &buf, 1); | |
434 | if (rc <= 0) | |
435 | goto error; | |
436 | rc = i2c_master_recv(chip, &buf, 1); | |
437 | if (rc <= 0) | |
438 | goto error; | |
439 | return (int)buf; | |
440 | error: | |
441 | DBG("Error reading LM87, retrying...\n"); | |
442 | if (++tries > 10) { | |
443 | printk(KERN_ERR "therm_pm72: Error reading LM87 !\n"); | |
444 | return -1; | |
445 | } | |
446 | msleep(10); | |
447 | } | |
448 | } | |
449 | ||
450 | static int fan_read_reg(int reg, unsigned char *buf, int nb) | |
451 | { | |
452 | int tries, nr, nw; | |
453 | ||
454 | buf[0] = reg; | |
455 | tries = 0; | |
456 | for (;;) { | |
457 | nw = i2c_master_send(fcu, buf, 1); | |
458 | if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100) | |
459 | break; | |
460 | msleep(10); | |
461 | ++tries; | |
462 | } | |
463 | if (nw <= 0) { | |
464 | printk(KERN_ERR "Failure writing address to FCU: %d", nw); | |
465 | return -EIO; | |
466 | } | |
467 | tries = 0; | |
468 | for (;;) { | |
469 | nr = i2c_master_recv(fcu, buf, nb); | |
470 | if (nr > 0 || (nr < 0 && nr != ENODEV) || tries >= 100) | |
471 | break; | |
472 | msleep(10); | |
473 | ++tries; | |
474 | } | |
475 | if (nr <= 0) | |
476 | printk(KERN_ERR "Failure reading data from FCU: %d", nw); | |
477 | return nr; | |
478 | } | |
479 | ||
480 | static int fan_write_reg(int reg, const unsigned char *ptr, int nb) | |
481 | { | |
482 | int tries, nw; | |
483 | unsigned char buf[16]; | |
484 | ||
485 | buf[0] = reg; | |
486 | memcpy(buf+1, ptr, nb); | |
487 | ++nb; | |
488 | tries = 0; | |
489 | for (;;) { | |
490 | nw = i2c_master_send(fcu, buf, nb); | |
491 | if (nw > 0 || (nw < 0 && nw != EIO) || tries >= 100) | |
492 | break; | |
493 | msleep(10); | |
494 | ++tries; | |
495 | } | |
496 | if (nw < 0) | |
497 | printk(KERN_ERR "Failure writing to FCU: %d", nw); | |
498 | return nw; | |
499 | } | |
500 | ||
501 | static int start_fcu(void) | |
502 | { | |
503 | unsigned char buf = 0xff; | |
504 | int rc; | |
505 | ||
506 | rc = fan_write_reg(0xe, &buf, 1); | |
507 | if (rc < 0) | |
508 | return -EIO; | |
509 | rc = fan_write_reg(0x2e, &buf, 1); | |
510 | if (rc < 0) | |
511 | return -EIO; | |
861fa773 BH |
512 | rc = fan_read_reg(0, &buf, 1); |
513 | if (rc < 0) | |
514 | return -EIO; | |
515 | fcu_rpm_shift = (buf == 1) ? 2 : 3; | |
516 | printk(KERN_DEBUG "FCU Initialized, RPM fan shift is %d\n", | |
517 | fcu_rpm_shift); | |
518 | ||
1da177e4 LT |
519 | return 0; |
520 | } | |
521 | ||
522 | static int set_rpm_fan(int fan_index, int rpm) | |
523 | { | |
524 | unsigned char buf[2]; | |
861fa773 | 525 | int rc, id, min, max; |
1da177e4 LT |
526 | |
527 | if (fcu_fans[fan_index].type != FCU_FAN_RPM) | |
528 | return -EINVAL; | |
529 | id = fcu_fans[fan_index].id; | |
530 | if (id == FCU_FAN_ABSENT_ID) | |
531 | return -EINVAL; | |
532 | ||
861fa773 BH |
533 | min = 2400 >> fcu_rpm_shift; |
534 | max = 56000 >> fcu_rpm_shift; | |
535 | ||
536 | if (rpm < min) | |
537 | rpm = min; | |
538 | else if (rpm > max) | |
539 | rpm = max; | |
540 | buf[0] = rpm >> (8 - fcu_rpm_shift); | |
541 | buf[1] = rpm << fcu_rpm_shift; | |
1da177e4 LT |
542 | rc = fan_write_reg(0x10 + (id * 2), buf, 2); |
543 | if (rc < 0) | |
544 | return -EIO; | |
545 | return 0; | |
546 | } | |
547 | ||
548 | static int get_rpm_fan(int fan_index, int programmed) | |
549 | { | |
550 | unsigned char failure; | |
551 | unsigned char active; | |
552 | unsigned char buf[2]; | |
553 | int rc, id, reg_base; | |
554 | ||
555 | if (fcu_fans[fan_index].type != FCU_FAN_RPM) | |
556 | return -EINVAL; | |
557 | id = fcu_fans[fan_index].id; | |
558 | if (id == FCU_FAN_ABSENT_ID) | |
559 | return -EINVAL; | |
560 | ||
561 | rc = fan_read_reg(0xb, &failure, 1); | |
562 | if (rc != 1) | |
563 | return -EIO; | |
564 | if ((failure & (1 << id)) != 0) | |
565 | return -EFAULT; | |
566 | rc = fan_read_reg(0xd, &active, 1); | |
567 | if (rc != 1) | |
568 | return -EIO; | |
569 | if ((active & (1 << id)) == 0) | |
570 | return -ENXIO; | |
571 | ||
572 | /* Programmed value or real current speed */ | |
573 | reg_base = programmed ? 0x10 : 0x11; | |
574 | rc = fan_read_reg(reg_base + (id * 2), buf, 2); | |
575 | if (rc != 2) | |
576 | return -EIO; | |
577 | ||
861fa773 | 578 | return (buf[0] << (8 - fcu_rpm_shift)) | buf[1] >> fcu_rpm_shift; |
1da177e4 LT |
579 | } |
580 | ||
581 | static int set_pwm_fan(int fan_index, int pwm) | |
582 | { | |
583 | unsigned char buf[2]; | |
584 | int rc, id; | |
585 | ||
586 | if (fcu_fans[fan_index].type != FCU_FAN_PWM) | |
587 | return -EINVAL; | |
588 | id = fcu_fans[fan_index].id; | |
589 | if (id == FCU_FAN_ABSENT_ID) | |
590 | return -EINVAL; | |
591 | ||
592 | if (pwm < 10) | |
593 | pwm = 10; | |
594 | else if (pwm > 100) | |
595 | pwm = 100; | |
596 | pwm = (pwm * 2559) / 1000; | |
597 | buf[0] = pwm; | |
598 | rc = fan_write_reg(0x30 + (id * 2), buf, 1); | |
599 | if (rc < 0) | |
600 | return rc; | |
601 | return 0; | |
602 | } | |
603 | ||
604 | static int get_pwm_fan(int fan_index) | |
605 | { | |
606 | unsigned char failure; | |
607 | unsigned char active; | |
608 | unsigned char buf[2]; | |
609 | int rc, id; | |
610 | ||
611 | if (fcu_fans[fan_index].type != FCU_FAN_PWM) | |
612 | return -EINVAL; | |
613 | id = fcu_fans[fan_index].id; | |
614 | if (id == FCU_FAN_ABSENT_ID) | |
615 | return -EINVAL; | |
616 | ||
617 | rc = fan_read_reg(0x2b, &failure, 1); | |
618 | if (rc != 1) | |
619 | return -EIO; | |
620 | if ((failure & (1 << id)) != 0) | |
621 | return -EFAULT; | |
622 | rc = fan_read_reg(0x2d, &active, 1); | |
623 | if (rc != 1) | |
624 | return -EIO; | |
625 | if ((active & (1 << id)) == 0) | |
626 | return -ENXIO; | |
627 | ||
628 | /* Programmed value or real current speed */ | |
629 | rc = fan_read_reg(0x30 + (id * 2), buf, 1); | |
630 | if (rc != 1) | |
631 | return -EIO; | |
632 | ||
633 | return (buf[0] * 1000) / 2559; | |
634 | } | |
635 | ||
861fa773 BH |
636 | static void tickle_fcu(void) |
637 | { | |
638 | int pwm; | |
639 | ||
640 | pwm = get_pwm_fan(SLOTS_FAN_PWM_INDEX); | |
641 | ||
642 | DBG("FCU Tickle, slots fan is: %d\n", pwm); | |
643 | if (pwm < 0) | |
644 | pwm = 100; | |
645 | ||
646 | if (!rackmac) { | |
647 | pwm = SLOTS_FAN_DEFAULT_PWM; | |
648 | } else if (pwm < SLOTS_PID_OUTPUT_MIN) | |
649 | pwm = SLOTS_PID_OUTPUT_MIN; | |
650 | ||
651 | /* That is hopefully enough to make the FCU happy */ | |
652 | set_pwm_fan(SLOTS_FAN_PWM_INDEX, pwm); | |
653 | } | |
654 | ||
655 | ||
1da177e4 LT |
656 | /* |
657 | * Utility routine to read the CPU calibration EEPROM data | |
658 | * from the device-tree | |
659 | */ | |
660 | static int read_eeprom(int cpu, struct mpu_data *out) | |
661 | { | |
662 | struct device_node *np; | |
663 | char nodename[64]; | |
018a3d1d | 664 | const u8 *data; |
1da177e4 LT |
665 | int len; |
666 | ||
667 | /* prom.c routine for finding a node by path is a bit brain dead | |
668 | * and requires exact @xxx unit numbers. This is a bit ugly but | |
669 | * will work for these machines | |
670 | */ | |
671 | sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0); | |
672 | np = of_find_node_by_path(nodename); | |
673 | if (np == NULL) { | |
943ffb58 | 674 | printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid node from device-tree\n"); |
1da177e4 LT |
675 | return -ENODEV; |
676 | } | |
01b2726d | 677 | data = of_get_property(np, "cpuid", &len); |
1da177e4 | 678 | if (data == NULL) { |
943ffb58 | 679 | printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid property from device-tree\n"); |
1da177e4 LT |
680 | of_node_put(np); |
681 | return -ENODEV; | |
682 | } | |
683 | memcpy(out, data, sizeof(struct mpu_data)); | |
684 | of_node_put(np); | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | static void fetch_cpu_pumps_minmax(void) | |
690 | { | |
691 | struct cpu_pid_state *state0 = &cpu_state[0]; | |
692 | struct cpu_pid_state *state1 = &cpu_state[1]; | |
693 | u16 pump_min = 0, pump_max = 0xffff; | |
694 | u16 tmp[4]; | |
695 | ||
696 | /* Try to fetch pumps min/max infos from eeprom */ | |
697 | ||
698 | memcpy(&tmp, &state0->mpu.processor_part_num, 8); | |
699 | if (tmp[0] != 0xffff && tmp[1] != 0xffff) { | |
700 | pump_min = max(pump_min, tmp[0]); | |
701 | pump_max = min(pump_max, tmp[1]); | |
702 | } | |
703 | if (tmp[2] != 0xffff && tmp[3] != 0xffff) { | |
704 | pump_min = max(pump_min, tmp[2]); | |
705 | pump_max = min(pump_max, tmp[3]); | |
706 | } | |
707 | ||
708 | /* Double check the values, this _IS_ needed as the EEPROM on | |
709 | * some dual 2.5Ghz G5s seem, at least, to have both min & max | |
710 | * same to the same value ... (grrrr) | |
711 | */ | |
712 | if (pump_min == pump_max || pump_min == 0 || pump_max == 0xffff) { | |
713 | pump_min = CPU_PUMP_OUTPUT_MIN; | |
714 | pump_max = CPU_PUMP_OUTPUT_MAX; | |
715 | } | |
716 | ||
717 | state0->pump_min = state1->pump_min = pump_min; | |
718 | state0->pump_max = state1->pump_max = pump_max; | |
719 | } | |
720 | ||
721 | /* | |
722 | * Now, unfortunately, sysfs doesn't give us a nice void * we could | |
723 | * pass around to the attribute functions, so we don't really have | |
724 | * choice but implement a bunch of them... | |
725 | * | |
726 | * That sucks a bit, we take the lock because FIX32TOPRINT evaluates | |
727 | * the input twice... I accept patches :) | |
728 | */ | |
729 | #define BUILD_SHOW_FUNC_FIX(name, data) \ | |
e404e274 | 730 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
731 | { \ |
732 | ssize_t r; \ | |
0885cb56 | 733 | mutex_lock(&driver_lock); \ |
1da177e4 | 734 | r = sprintf(buf, "%d.%03d", FIX32TOPRINT(data)); \ |
0885cb56 | 735 | mutex_unlock(&driver_lock); \ |
1da177e4 LT |
736 | return r; \ |
737 | } | |
738 | #define BUILD_SHOW_FUNC_INT(name, data) \ | |
e404e274 | 739 | static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ |
1da177e4 LT |
740 | { \ |
741 | return sprintf(buf, "%d", data); \ | |
742 | } | |
743 | ||
744 | BUILD_SHOW_FUNC_FIX(cpu0_temperature, cpu_state[0].last_temp) | |
745 | BUILD_SHOW_FUNC_FIX(cpu0_voltage, cpu_state[0].voltage) | |
746 | BUILD_SHOW_FUNC_FIX(cpu0_current, cpu_state[0].current_a) | |
747 | BUILD_SHOW_FUNC_INT(cpu0_exhaust_fan_rpm, cpu_state[0].rpm) | |
748 | BUILD_SHOW_FUNC_INT(cpu0_intake_fan_rpm, cpu_state[0].intake_rpm) | |
749 | ||
750 | BUILD_SHOW_FUNC_FIX(cpu1_temperature, cpu_state[1].last_temp) | |
751 | BUILD_SHOW_FUNC_FIX(cpu1_voltage, cpu_state[1].voltage) | |
752 | BUILD_SHOW_FUNC_FIX(cpu1_current, cpu_state[1].current_a) | |
753 | BUILD_SHOW_FUNC_INT(cpu1_exhaust_fan_rpm, cpu_state[1].rpm) | |
754 | BUILD_SHOW_FUNC_INT(cpu1_intake_fan_rpm, cpu_state[1].intake_rpm) | |
755 | ||
756 | BUILD_SHOW_FUNC_FIX(backside_temperature, backside_state.last_temp) | |
757 | BUILD_SHOW_FUNC_INT(backside_fan_pwm, backside_state.pwm) | |
758 | ||
759 | BUILD_SHOW_FUNC_FIX(drives_temperature, drives_state.last_temp) | |
760 | BUILD_SHOW_FUNC_INT(drives_fan_rpm, drives_state.rpm) | |
761 | ||
861fa773 BH |
762 | BUILD_SHOW_FUNC_FIX(slots_temperature, slots_state.last_temp) |
763 | BUILD_SHOW_FUNC_INT(slots_fan_pwm, slots_state.pwm) | |
764 | ||
1da177e4 LT |
765 | BUILD_SHOW_FUNC_FIX(dimms_temperature, dimms_state.last_temp) |
766 | ||
767 | static DEVICE_ATTR(cpu0_temperature,S_IRUGO,show_cpu0_temperature,NULL); | |
768 | static DEVICE_ATTR(cpu0_voltage,S_IRUGO,show_cpu0_voltage,NULL); | |
769 | static DEVICE_ATTR(cpu0_current,S_IRUGO,show_cpu0_current,NULL); | |
770 | static DEVICE_ATTR(cpu0_exhaust_fan_rpm,S_IRUGO,show_cpu0_exhaust_fan_rpm,NULL); | |
771 | static DEVICE_ATTR(cpu0_intake_fan_rpm,S_IRUGO,show_cpu0_intake_fan_rpm,NULL); | |
772 | ||
773 | static DEVICE_ATTR(cpu1_temperature,S_IRUGO,show_cpu1_temperature,NULL); | |
774 | static DEVICE_ATTR(cpu1_voltage,S_IRUGO,show_cpu1_voltage,NULL); | |
775 | static DEVICE_ATTR(cpu1_current,S_IRUGO,show_cpu1_current,NULL); | |
776 | static DEVICE_ATTR(cpu1_exhaust_fan_rpm,S_IRUGO,show_cpu1_exhaust_fan_rpm,NULL); | |
777 | static DEVICE_ATTR(cpu1_intake_fan_rpm,S_IRUGO,show_cpu1_intake_fan_rpm,NULL); | |
778 | ||
779 | static DEVICE_ATTR(backside_temperature,S_IRUGO,show_backside_temperature,NULL); | |
780 | static DEVICE_ATTR(backside_fan_pwm,S_IRUGO,show_backside_fan_pwm,NULL); | |
781 | ||
782 | static DEVICE_ATTR(drives_temperature,S_IRUGO,show_drives_temperature,NULL); | |
783 | static DEVICE_ATTR(drives_fan_rpm,S_IRUGO,show_drives_fan_rpm,NULL); | |
784 | ||
861fa773 BH |
785 | static DEVICE_ATTR(slots_temperature,S_IRUGO,show_slots_temperature,NULL); |
786 | static DEVICE_ATTR(slots_fan_pwm,S_IRUGO,show_slots_fan_pwm,NULL); | |
787 | ||
1da177e4 LT |
788 | static DEVICE_ATTR(dimms_temperature,S_IRUGO,show_dimms_temperature,NULL); |
789 | ||
790 | /* | |
791 | * CPUs fans control loop | |
792 | */ | |
793 | ||
794 | static int do_read_one_cpu_values(struct cpu_pid_state *state, s32 *temp, s32 *power) | |
795 | { | |
796 | s32 ltemp, volts, amps; | |
797 | int index, rc = 0; | |
798 | ||
799 | /* Default (in case of error) */ | |
800 | *temp = state->cur_temp; | |
801 | *power = state->cur_power; | |
802 | ||
803 | if (cpu_pid_type == CPU_PID_TYPE_RACKMAC) | |
804 | index = (state->index == 0) ? | |
805 | CPU_A1_FAN_RPM_INDEX : CPU_B1_FAN_RPM_INDEX; | |
806 | else | |
807 | index = (state->index == 0) ? | |
808 | CPUA_EXHAUST_FAN_RPM_INDEX : CPUB_EXHAUST_FAN_RPM_INDEX; | |
809 | ||
810 | /* Read current fan status */ | |
811 | rc = get_rpm_fan(index, !RPM_PID_USE_ACTUAL_SPEED); | |
812 | if (rc < 0) { | |
813 | /* XXX What do we do now ? Nothing for now, keep old value, but | |
814 | * return error upstream | |
815 | */ | |
816 | DBG(" cpu %d, fan reading error !\n", state->index); | |
817 | } else { | |
818 | state->rpm = rc; | |
819 | DBG(" cpu %d, exhaust RPM: %d\n", state->index, state->rpm); | |
820 | } | |
821 | ||
822 | /* Get some sensor readings and scale it */ | |
823 | ltemp = read_smon_adc(state, 1); | |
824 | if (ltemp == -1) { | |
825 | /* XXX What do we do now ? */ | |
826 | state->overtemp++; | |
827 | if (rc == 0) | |
828 | rc = -EIO; | |
829 | DBG(" cpu %d, temp reading error !\n", state->index); | |
830 | } else { | |
831 | /* Fixup temperature according to diode calibration | |
832 | */ | |
833 | DBG(" cpu %d, temp raw: %04x, m_diode: %04x, b_diode: %04x\n", | |
834 | state->index, | |
835 | ltemp, state->mpu.mdiode, state->mpu.bdiode); | |
836 | *temp = ((s32)ltemp * (s32)state->mpu.mdiode + ((s32)state->mpu.bdiode << 12)) >> 2; | |
837 | state->last_temp = *temp; | |
838 | DBG(" temp: %d.%03d\n", FIX32TOPRINT((*temp))); | |
839 | } | |
840 | ||
841 | /* | |
842 | * Read voltage & current and calculate power | |
843 | */ | |
844 | volts = read_smon_adc(state, 3); | |
845 | amps = read_smon_adc(state, 4); | |
846 | ||
847 | /* Scale voltage and current raw sensor values according to fixed scales | |
848 | * obtained in Darwin and calculate power from I and V | |
849 | */ | |
850 | volts *= ADC_CPU_VOLTAGE_SCALE; | |
851 | amps *= ADC_CPU_CURRENT_SCALE; | |
852 | *power = (((u64)volts) * ((u64)amps)) >> 16; | |
853 | state->voltage = volts; | |
854 | state->current_a = amps; | |
855 | state->last_power = *power; | |
856 | ||
857 | DBG(" cpu %d, current: %d.%03d, voltage: %d.%03d, power: %d.%03d W\n", | |
858 | state->index, FIX32TOPRINT(state->current_a), | |
859 | FIX32TOPRINT(state->voltage), FIX32TOPRINT(*power)); | |
860 | ||
861 | return 0; | |
862 | } | |
863 | ||
864 | static void do_cpu_pid(struct cpu_pid_state *state, s32 temp, s32 power) | |
865 | { | |
866 | s32 power_target, integral, derivative, proportional, adj_in_target, sval; | |
867 | s64 integ_p, deriv_p, prop_p, sum; | |
868 | int i; | |
869 | ||
870 | /* Calculate power target value (could be done once for all) | |
871 | * and convert to a 16.16 fp number | |
872 | */ | |
873 | power_target = ((u32)(state->mpu.pmaxh - state->mpu.padjmax)) << 16; | |
874 | DBG(" power target: %d.%03d, error: %d.%03d\n", | |
875 | FIX32TOPRINT(power_target), FIX32TOPRINT(power_target - power)); | |
876 | ||
877 | /* Store temperature and power in history array */ | |
878 | state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE; | |
879 | state->temp_history[state->cur_temp] = temp; | |
880 | state->cur_power = (state->cur_power + 1) % state->count_power; | |
881 | state->power_history[state->cur_power] = power; | |
882 | state->error_history[state->cur_power] = power_target - power; | |
883 | ||
884 | /* If first loop, fill the history table */ | |
885 | if (state->first) { | |
886 | for (i = 0; i < (state->count_power - 1); i++) { | |
887 | state->cur_power = (state->cur_power + 1) % state->count_power; | |
888 | state->power_history[state->cur_power] = power; | |
889 | state->error_history[state->cur_power] = power_target - power; | |
890 | } | |
891 | for (i = 0; i < (CPU_TEMP_HISTORY_SIZE - 1); i++) { | |
892 | state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE; | |
893 | state->temp_history[state->cur_temp] = temp; | |
894 | } | |
895 | state->first = 0; | |
896 | } | |
897 | ||
898 | /* Calculate the integral term normally based on the "power" values */ | |
899 | sum = 0; | |
900 | integral = 0; | |
901 | for (i = 0; i < state->count_power; i++) | |
902 | integral += state->error_history[i]; | |
903 | integral *= CPU_PID_INTERVAL; | |
904 | DBG(" integral: %08x\n", integral); | |
905 | ||
906 | /* Calculate the adjusted input (sense value). | |
907 | * G_r is 12.20 | |
908 | * integ is 16.16 | |
909 | * so the result is 28.36 | |
910 | * | |
911 | * input target is mpu.ttarget, input max is mpu.tmax | |
912 | */ | |
913 | integ_p = ((s64)state->mpu.pid_gr) * (s64)integral; | |
914 | DBG(" integ_p: %d\n", (int)(integ_p >> 36)); | |
915 | sval = (state->mpu.tmax << 16) - ((integ_p >> 20) & 0xffffffff); | |
916 | adj_in_target = (state->mpu.ttarget << 16); | |
917 | if (adj_in_target > sval) | |
918 | adj_in_target = sval; | |
919 | DBG(" adj_in_target: %d.%03d, ttarget: %d\n", FIX32TOPRINT(adj_in_target), | |
920 | state->mpu.ttarget); | |
921 | ||
922 | /* Calculate the derivative term */ | |
923 | derivative = state->temp_history[state->cur_temp] - | |
924 | state->temp_history[(state->cur_temp + CPU_TEMP_HISTORY_SIZE - 1) | |
925 | % CPU_TEMP_HISTORY_SIZE]; | |
926 | derivative /= CPU_PID_INTERVAL; | |
927 | deriv_p = ((s64)state->mpu.pid_gd) * (s64)derivative; | |
928 | DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); | |
929 | sum += deriv_p; | |
930 | ||
931 | /* Calculate the proportional term */ | |
932 | proportional = temp - adj_in_target; | |
933 | prop_p = ((s64)state->mpu.pid_gp) * (s64)proportional; | |
934 | DBG(" prop_p: %d\n", (int)(prop_p >> 36)); | |
935 | sum += prop_p; | |
936 | ||
937 | /* Scale sum */ | |
938 | sum >>= 36; | |
939 | ||
940 | DBG(" sum: %d\n", (int)sum); | |
941 | state->rpm += (s32)sum; | |
942 | } | |
943 | ||
944 | static void do_monitor_cpu_combined(void) | |
945 | { | |
946 | struct cpu_pid_state *state0 = &cpu_state[0]; | |
947 | struct cpu_pid_state *state1 = &cpu_state[1]; | |
948 | s32 temp0, power0, temp1, power1; | |
949 | s32 temp_combi, power_combi; | |
950 | int rc, intake, pump; | |
951 | ||
952 | rc = do_read_one_cpu_values(state0, &temp0, &power0); | |
953 | if (rc < 0) { | |
954 | /* XXX What do we do now ? */ | |
955 | } | |
956 | state1->overtemp = 0; | |
957 | rc = do_read_one_cpu_values(state1, &temp1, &power1); | |
958 | if (rc < 0) { | |
959 | /* XXX What do we do now ? */ | |
960 | } | |
961 | if (state1->overtemp) | |
962 | state0->overtemp++; | |
963 | ||
964 | temp_combi = max(temp0, temp1); | |
965 | power_combi = max(power0, power1); | |
966 | ||
967 | /* Check tmax, increment overtemp if we are there. At tmax+8, we go | |
968 | * full blown immediately and try to trigger a shutdown | |
969 | */ | |
970 | if (temp_combi >= ((state0->mpu.tmax + 8) << 16)) { | |
971 | printk(KERN_WARNING "Warning ! Temperature way above maximum (%d) !\n", | |
972 | temp_combi >> 16); | |
f12f4d90 | 973 | state0->overtemp += CPU_MAX_OVERTEMP / 4; |
1da177e4 LT |
974 | } else if (temp_combi > (state0->mpu.tmax << 16)) |
975 | state0->overtemp++; | |
976 | else | |
977 | state0->overtemp = 0; | |
978 | if (state0->overtemp >= CPU_MAX_OVERTEMP) | |
979 | critical_state = 1; | |
980 | if (state0->overtemp > 0) { | |
981 | state0->rpm = state0->mpu.rmaxn_exhaust_fan; | |
982 | state0->intake_rpm = intake = state0->mpu.rmaxn_intake_fan; | |
6ee7fb7e | 983 | pump = state0->pump_max; |
1da177e4 LT |
984 | goto do_set_fans; |
985 | } | |
986 | ||
987 | /* Do the PID */ | |
988 | do_cpu_pid(state0, temp_combi, power_combi); | |
989 | ||
990 | /* Range check */ | |
991 | state0->rpm = max(state0->rpm, (int)state0->mpu.rminn_exhaust_fan); | |
992 | state0->rpm = min(state0->rpm, (int)state0->mpu.rmaxn_exhaust_fan); | |
993 | ||
994 | /* Calculate intake fan speed */ | |
995 | intake = (state0->rpm * CPU_INTAKE_SCALE) >> 16; | |
996 | intake = max(intake, (int)state0->mpu.rminn_intake_fan); | |
997 | intake = min(intake, (int)state0->mpu.rmaxn_intake_fan); | |
998 | state0->intake_rpm = intake; | |
999 | ||
1000 | /* Calculate pump speed */ | |
1001 | pump = (state0->rpm * state0->pump_max) / | |
1002 | state0->mpu.rmaxn_exhaust_fan; | |
1003 | pump = min(pump, state0->pump_max); | |
1004 | pump = max(pump, state0->pump_min); | |
1005 | ||
1006 | do_set_fans: | |
1007 | /* We copy values from state 0 to state 1 for /sysfs */ | |
1008 | state1->rpm = state0->rpm; | |
1009 | state1->intake_rpm = state0->intake_rpm; | |
1010 | ||
1011 | DBG("** CPU %d RPM: %d Ex, %d, Pump: %d, In, overtemp: %d\n", | |
1012 | state1->index, (int)state1->rpm, intake, pump, state1->overtemp); | |
1013 | ||
1014 | /* We should check for errors, shouldn't we ? But then, what | |
1015 | * do we do once the error occurs ? For FCU notified fan | |
1016 | * failures (-EFAULT) we probably want to notify userland | |
1017 | * some way... | |
1018 | */ | |
1019 | set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake); | |
1020 | set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state0->rpm); | |
1021 | set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake); | |
1022 | set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state0->rpm); | |
1023 | ||
1024 | if (fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID) | |
1025 | set_rpm_fan(CPUA_PUMP_RPM_INDEX, pump); | |
1026 | if (fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID) | |
1027 | set_rpm_fan(CPUB_PUMP_RPM_INDEX, pump); | |
1028 | } | |
1029 | ||
1030 | static void do_monitor_cpu_split(struct cpu_pid_state *state) | |
1031 | { | |
1032 | s32 temp, power; | |
1033 | int rc, intake; | |
1034 | ||
1035 | /* Read current fan status */ | |
1036 | rc = do_read_one_cpu_values(state, &temp, &power); | |
1037 | if (rc < 0) { | |
1038 | /* XXX What do we do now ? */ | |
1039 | } | |
1040 | ||
1041 | /* Check tmax, increment overtemp if we are there. At tmax+8, we go | |
1042 | * full blown immediately and try to trigger a shutdown | |
1043 | */ | |
1044 | if (temp >= ((state->mpu.tmax + 8) << 16)) { | |
1045 | printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum" | |
1046 | " (%d) !\n", | |
1047 | state->index, temp >> 16); | |
f12f4d90 | 1048 | state->overtemp += CPU_MAX_OVERTEMP / 4; |
1da177e4 LT |
1049 | } else if (temp > (state->mpu.tmax << 16)) |
1050 | state->overtemp++; | |
1051 | else | |
1052 | state->overtemp = 0; | |
1053 | if (state->overtemp >= CPU_MAX_OVERTEMP) | |
1054 | critical_state = 1; | |
1055 | if (state->overtemp > 0) { | |
1056 | state->rpm = state->mpu.rmaxn_exhaust_fan; | |
1057 | state->intake_rpm = intake = state->mpu.rmaxn_intake_fan; | |
1058 | goto do_set_fans; | |
1059 | } | |
1060 | ||
1061 | /* Do the PID */ | |
1062 | do_cpu_pid(state, temp, power); | |
1063 | ||
1064 | /* Range check */ | |
1065 | state->rpm = max(state->rpm, (int)state->mpu.rminn_exhaust_fan); | |
1066 | state->rpm = min(state->rpm, (int)state->mpu.rmaxn_exhaust_fan); | |
1067 | ||
1068 | /* Calculate intake fan */ | |
1069 | intake = (state->rpm * CPU_INTAKE_SCALE) >> 16; | |
1070 | intake = max(intake, (int)state->mpu.rminn_intake_fan); | |
1071 | intake = min(intake, (int)state->mpu.rmaxn_intake_fan); | |
1072 | state->intake_rpm = intake; | |
1073 | ||
1074 | do_set_fans: | |
1075 | DBG("** CPU %d RPM: %d Ex, %d In, overtemp: %d\n", | |
1076 | state->index, (int)state->rpm, intake, state->overtemp); | |
1077 | ||
1078 | /* We should check for errors, shouldn't we ? But then, what | |
1079 | * do we do once the error occurs ? For FCU notified fan | |
1080 | * failures (-EFAULT) we probably want to notify userland | |
1081 | * some way... | |
1082 | */ | |
1083 | if (state->index == 0) { | |
1084 | set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake); | |
1085 | set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state->rpm); | |
1086 | } else { | |
1087 | set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake); | |
1088 | set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state->rpm); | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | static void do_monitor_cpu_rack(struct cpu_pid_state *state) | |
1093 | { | |
1094 | s32 temp, power, fan_min; | |
1095 | int rc; | |
1096 | ||
1097 | /* Read current fan status */ | |
1098 | rc = do_read_one_cpu_values(state, &temp, &power); | |
1099 | if (rc < 0) { | |
1100 | /* XXX What do we do now ? */ | |
1101 | } | |
1102 | ||
1103 | /* Check tmax, increment overtemp if we are there. At tmax+8, we go | |
1104 | * full blown immediately and try to trigger a shutdown | |
1105 | */ | |
1106 | if (temp >= ((state->mpu.tmax + 8) << 16)) { | |
1107 | printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum" | |
1108 | " (%d) !\n", | |
1109 | state->index, temp >> 16); | |
f12f4d90 | 1110 | state->overtemp = CPU_MAX_OVERTEMP / 4; |
1da177e4 LT |
1111 | } else if (temp > (state->mpu.tmax << 16)) |
1112 | state->overtemp++; | |
1113 | else | |
1114 | state->overtemp = 0; | |
1115 | if (state->overtemp >= CPU_MAX_OVERTEMP) | |
1116 | critical_state = 1; | |
1117 | if (state->overtemp > 0) { | |
1118 | state->rpm = state->intake_rpm = state->mpu.rmaxn_intake_fan; | |
1119 | goto do_set_fans; | |
1120 | } | |
1121 | ||
1122 | /* Do the PID */ | |
1123 | do_cpu_pid(state, temp, power); | |
1124 | ||
1125 | /* Check clamp from dimms */ | |
1126 | fan_min = dimm_output_clamp; | |
1127 | fan_min = max(fan_min, (int)state->mpu.rminn_intake_fan); | |
1128 | ||
861fa773 BH |
1129 | DBG(" CPU min mpu = %d, min dimm = %d\n", |
1130 | state->mpu.rminn_intake_fan, dimm_output_clamp); | |
1131 | ||
1da177e4 LT |
1132 | state->rpm = max(state->rpm, (int)fan_min); |
1133 | state->rpm = min(state->rpm, (int)state->mpu.rmaxn_intake_fan); | |
1134 | state->intake_rpm = state->rpm; | |
1135 | ||
1136 | do_set_fans: | |
1137 | DBG("** CPU %d RPM: %d overtemp: %d\n", | |
1138 | state->index, (int)state->rpm, state->overtemp); | |
1139 | ||
1140 | /* We should check for errors, shouldn't we ? But then, what | |
1141 | * do we do once the error occurs ? For FCU notified fan | |
1142 | * failures (-EFAULT) we probably want to notify userland | |
1143 | * some way... | |
1144 | */ | |
1145 | if (state->index == 0) { | |
1146 | set_rpm_fan(CPU_A1_FAN_RPM_INDEX, state->rpm); | |
1147 | set_rpm_fan(CPU_A2_FAN_RPM_INDEX, state->rpm); | |
1148 | set_rpm_fan(CPU_A3_FAN_RPM_INDEX, state->rpm); | |
1149 | } else { | |
1150 | set_rpm_fan(CPU_B1_FAN_RPM_INDEX, state->rpm); | |
1151 | set_rpm_fan(CPU_B2_FAN_RPM_INDEX, state->rpm); | |
1152 | set_rpm_fan(CPU_B3_FAN_RPM_INDEX, state->rpm); | |
1153 | } | |
1154 | } | |
1155 | ||
1156 | /* | |
1157 | * Initialize the state structure for one CPU control loop | |
1158 | */ | |
1159 | static int init_cpu_state(struct cpu_pid_state *state, int index) | |
1160 | { | |
97759e49 SR |
1161 | int err; |
1162 | ||
1da177e4 LT |
1163 | state->index = index; |
1164 | state->first = 1; | |
1165 | state->rpm = (cpu_pid_type == CPU_PID_TYPE_RACKMAC) ? 4000 : 1000; | |
1166 | state->overtemp = 0; | |
1167 | state->adc_config = 0x00; | |
1168 | ||
1169 | ||
1170 | if (index == 0) | |
1171 | state->monitor = attach_i2c_chip(SUPPLY_MONITOR_ID, "CPU0_monitor"); | |
1172 | else if (index == 1) | |
1173 | state->monitor = attach_i2c_chip(SUPPLY_MONITORB_ID, "CPU1_monitor"); | |
1174 | if (state->monitor == NULL) | |
1175 | goto fail; | |
1176 | ||
1177 | if (read_eeprom(index, &state->mpu)) | |
1178 | goto fail; | |
1179 | ||
1180 | state->count_power = state->mpu.tguardband; | |
1181 | if (state->count_power > CPU_POWER_HISTORY_SIZE) { | |
1182 | printk(KERN_WARNING "Warning ! too many power history slots\n"); | |
1183 | state->count_power = CPU_POWER_HISTORY_SIZE; | |
1184 | } | |
1185 | DBG("CPU %d Using %d power history entries\n", index, state->count_power); | |
1186 | ||
1187 | if (index == 0) { | |
97759e49 SR |
1188 | err = device_create_file(&of_dev->dev, &dev_attr_cpu0_temperature); |
1189 | err |= device_create_file(&of_dev->dev, &dev_attr_cpu0_voltage); | |
1190 | err |= device_create_file(&of_dev->dev, &dev_attr_cpu0_current); | |
1191 | err |= device_create_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm); | |
1192 | err |= device_create_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm); | |
1da177e4 | 1193 | } else { |
97759e49 SR |
1194 | err = device_create_file(&of_dev->dev, &dev_attr_cpu1_temperature); |
1195 | err |= device_create_file(&of_dev->dev, &dev_attr_cpu1_voltage); | |
1196 | err |= device_create_file(&of_dev->dev, &dev_attr_cpu1_current); | |
1197 | err |= device_create_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm); | |
1198 | err |= device_create_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm); | |
1da177e4 | 1199 | } |
97759e49 SR |
1200 | if (err) |
1201 | printk(KERN_WARNING "Failed to create some of the atribute" | |
1202 | "files for CPU %d\n", index); | |
1da177e4 LT |
1203 | |
1204 | return 0; | |
1205 | fail: | |
1206 | if (state->monitor) | |
1207 | detach_i2c_chip(state->monitor); | |
1208 | state->monitor = NULL; | |
1209 | ||
1210 | return -ENODEV; | |
1211 | } | |
1212 | ||
1213 | /* | |
1214 | * Dispose of the state data for one CPU control loop | |
1215 | */ | |
1216 | static void dispose_cpu_state(struct cpu_pid_state *state) | |
1217 | { | |
1218 | if (state->monitor == NULL) | |
1219 | return; | |
1220 | ||
1221 | if (state->index == 0) { | |
1222 | device_remove_file(&of_dev->dev, &dev_attr_cpu0_temperature); | |
1223 | device_remove_file(&of_dev->dev, &dev_attr_cpu0_voltage); | |
1224 | device_remove_file(&of_dev->dev, &dev_attr_cpu0_current); | |
1225 | device_remove_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm); | |
1226 | device_remove_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm); | |
1227 | } else { | |
1228 | device_remove_file(&of_dev->dev, &dev_attr_cpu1_temperature); | |
1229 | device_remove_file(&of_dev->dev, &dev_attr_cpu1_voltage); | |
1230 | device_remove_file(&of_dev->dev, &dev_attr_cpu1_current); | |
1231 | device_remove_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm); | |
1232 | device_remove_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm); | |
1233 | } | |
1234 | ||
1235 | detach_i2c_chip(state->monitor); | |
1236 | state->monitor = NULL; | |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * Motherboard backside & U3 heatsink fan control loop | |
1241 | */ | |
1242 | static void do_monitor_backside(struct backside_pid_state *state) | |
1243 | { | |
1244 | s32 temp, integral, derivative, fan_min; | |
1245 | s64 integ_p, deriv_p, prop_p, sum; | |
1246 | int i, rc; | |
1247 | ||
1248 | if (--state->ticks != 0) | |
1249 | return; | |
1250 | state->ticks = backside_params.interval; | |
1251 | ||
1252 | DBG("backside:\n"); | |
1253 | ||
1254 | /* Check fan status */ | |
1255 | rc = get_pwm_fan(BACKSIDE_FAN_PWM_INDEX); | |
1256 | if (rc < 0) { | |
1257 | printk(KERN_WARNING "Error %d reading backside fan !\n", rc); | |
1258 | /* XXX What do we do now ? */ | |
1259 | } else | |
1260 | state->pwm = rc; | |
1261 | DBG(" current pwm: %d\n", state->pwm); | |
1262 | ||
1263 | /* Get some sensor readings */ | |
1264 | temp = i2c_smbus_read_byte_data(state->monitor, MAX6690_EXT_TEMP) << 16; | |
1265 | state->last_temp = temp; | |
1266 | DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp), | |
1267 | FIX32TOPRINT(backside_params.input_target)); | |
1268 | ||
1269 | /* Store temperature and error in history array */ | |
1270 | state->cur_sample = (state->cur_sample + 1) % BACKSIDE_PID_HISTORY_SIZE; | |
1271 | state->sample_history[state->cur_sample] = temp; | |
1272 | state->error_history[state->cur_sample] = temp - backside_params.input_target; | |
1273 | ||
1274 | /* If first loop, fill the history table */ | |
1275 | if (state->first) { | |
1276 | for (i = 0; i < (BACKSIDE_PID_HISTORY_SIZE - 1); i++) { | |
1277 | state->cur_sample = (state->cur_sample + 1) % | |
1278 | BACKSIDE_PID_HISTORY_SIZE; | |
1279 | state->sample_history[state->cur_sample] = temp; | |
1280 | state->error_history[state->cur_sample] = | |
1281 | temp - backside_params.input_target; | |
1282 | } | |
1283 | state->first = 0; | |
1284 | } | |
1285 | ||
1286 | /* Calculate the integral term */ | |
1287 | sum = 0; | |
1288 | integral = 0; | |
1289 | for (i = 0; i < BACKSIDE_PID_HISTORY_SIZE; i++) | |
1290 | integral += state->error_history[i]; | |
1291 | integral *= backside_params.interval; | |
1292 | DBG(" integral: %08x\n", integral); | |
1293 | integ_p = ((s64)backside_params.G_r) * (s64)integral; | |
1294 | DBG(" integ_p: %d\n", (int)(integ_p >> 36)); | |
1295 | sum += integ_p; | |
1296 | ||
1297 | /* Calculate the derivative term */ | |
1298 | derivative = state->error_history[state->cur_sample] - | |
1299 | state->error_history[(state->cur_sample + BACKSIDE_PID_HISTORY_SIZE - 1) | |
1300 | % BACKSIDE_PID_HISTORY_SIZE]; | |
1301 | derivative /= backside_params.interval; | |
1302 | deriv_p = ((s64)backside_params.G_d) * (s64)derivative; | |
1303 | DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); | |
1304 | sum += deriv_p; | |
1305 | ||
1306 | /* Calculate the proportional term */ | |
1307 | prop_p = ((s64)backside_params.G_p) * (s64)(state->error_history[state->cur_sample]); | |
1308 | DBG(" prop_p: %d\n", (int)(prop_p >> 36)); | |
1309 | sum += prop_p; | |
1310 | ||
1311 | /* Scale sum */ | |
1312 | sum >>= 36; | |
1313 | ||
1314 | DBG(" sum: %d\n", (int)sum); | |
1315 | if (backside_params.additive) | |
1316 | state->pwm += (s32)sum; | |
1317 | else | |
1318 | state->pwm = sum; | |
1319 | ||
1320 | /* Check for clamp */ | |
1321 | fan_min = (dimm_output_clamp * 100) / 14000; | |
1322 | fan_min = max(fan_min, backside_params.output_min); | |
1323 | ||
1324 | state->pwm = max(state->pwm, fan_min); | |
1325 | state->pwm = min(state->pwm, backside_params.output_max); | |
1326 | ||
1327 | DBG("** BACKSIDE PWM: %d\n", (int)state->pwm); | |
1328 | set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, state->pwm); | |
1329 | } | |
1330 | ||
1331 | /* | |
1332 | * Initialize the state structure for the backside fan control loop | |
1333 | */ | |
1334 | static int init_backside_state(struct backside_pid_state *state) | |
1335 | { | |
1336 | struct device_node *u3; | |
1337 | int u3h = 1; /* conservative by default */ | |
97759e49 | 1338 | int err; |
1da177e4 LT |
1339 | |
1340 | /* | |
1341 | * There are different PID params for machines with U3 and machines | |
1342 | * with U3H, pick the right ones now | |
1343 | */ | |
1344 | u3 = of_find_node_by_path("/u3@0,f8000000"); | |
1345 | if (u3 != NULL) { | |
01b2726d | 1346 | const u32 *vers = of_get_property(u3, "device-rev", NULL); |
1da177e4 LT |
1347 | if (vers) |
1348 | if (((*vers) & 0x3f) < 0x34) | |
1349 | u3h = 0; | |
1350 | of_node_put(u3); | |
1351 | } | |
1352 | ||
1353 | if (rackmac) { | |
1354 | backside_params.G_d = BACKSIDE_PID_RACK_G_d; | |
1355 | backside_params.input_target = BACKSIDE_PID_RACK_INPUT_TARGET; | |
1356 | backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN; | |
1357 | backside_params.interval = BACKSIDE_PID_RACK_INTERVAL; | |
1358 | backside_params.G_p = BACKSIDE_PID_RACK_G_p; | |
1359 | backside_params.G_r = BACKSIDE_PID_G_r; | |
1360 | backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX; | |
1361 | backside_params.additive = 0; | |
1362 | } else if (u3h) { | |
1363 | backside_params.G_d = BACKSIDE_PID_U3H_G_d; | |
1364 | backside_params.input_target = BACKSIDE_PID_U3H_INPUT_TARGET; | |
1365 | backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN; | |
1366 | backside_params.interval = BACKSIDE_PID_INTERVAL; | |
1367 | backside_params.G_p = BACKSIDE_PID_G_p; | |
1368 | backside_params.G_r = BACKSIDE_PID_G_r; | |
1369 | backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX; | |
1370 | backside_params.additive = 1; | |
1371 | } else { | |
1372 | backside_params.G_d = BACKSIDE_PID_U3_G_d; | |
1373 | backside_params.input_target = BACKSIDE_PID_U3_INPUT_TARGET; | |
1374 | backside_params.output_min = BACKSIDE_PID_U3_OUTPUT_MIN; | |
1375 | backside_params.interval = BACKSIDE_PID_INTERVAL; | |
1376 | backside_params.G_p = BACKSIDE_PID_G_p; | |
1377 | backside_params.G_r = BACKSIDE_PID_G_r; | |
1378 | backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX; | |
1379 | backside_params.additive = 1; | |
1380 | } | |
1381 | ||
1382 | state->ticks = 1; | |
1383 | state->first = 1; | |
1384 | state->pwm = 50; | |
1385 | ||
1386 | state->monitor = attach_i2c_chip(BACKSIDE_MAX_ID, "backside_temp"); | |
1387 | if (state->monitor == NULL) | |
1388 | return -ENODEV; | |
1389 | ||
97759e49 SR |
1390 | err = device_create_file(&of_dev->dev, &dev_attr_backside_temperature); |
1391 | err |= device_create_file(&of_dev->dev, &dev_attr_backside_fan_pwm); | |
1392 | if (err) | |
1393 | printk(KERN_WARNING "Failed to create attribute file(s)" | |
1394 | " for backside fan\n"); | |
1da177e4 LT |
1395 | |
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * Dispose of the state data for the backside control loop | |
1401 | */ | |
1402 | static void dispose_backside_state(struct backside_pid_state *state) | |
1403 | { | |
1404 | if (state->monitor == NULL) | |
1405 | return; | |
1406 | ||
1407 | device_remove_file(&of_dev->dev, &dev_attr_backside_temperature); | |
1408 | device_remove_file(&of_dev->dev, &dev_attr_backside_fan_pwm); | |
1409 | ||
1410 | detach_i2c_chip(state->monitor); | |
1411 | state->monitor = NULL; | |
1412 | } | |
1413 | ||
1414 | /* | |
1415 | * Drives bay fan control loop | |
1416 | */ | |
1417 | static void do_monitor_drives(struct drives_pid_state *state) | |
1418 | { | |
1419 | s32 temp, integral, derivative; | |
1420 | s64 integ_p, deriv_p, prop_p, sum; | |
1421 | int i, rc; | |
1422 | ||
1423 | if (--state->ticks != 0) | |
1424 | return; | |
1425 | state->ticks = DRIVES_PID_INTERVAL; | |
1426 | ||
1427 | DBG("drives:\n"); | |
1428 | ||
1429 | /* Check fan status */ | |
1430 | rc = get_rpm_fan(DRIVES_FAN_RPM_INDEX, !RPM_PID_USE_ACTUAL_SPEED); | |
1431 | if (rc < 0) { | |
1432 | printk(KERN_WARNING "Error %d reading drives fan !\n", rc); | |
1433 | /* XXX What do we do now ? */ | |
1434 | } else | |
1435 | state->rpm = rc; | |
1436 | DBG(" current rpm: %d\n", state->rpm); | |
1437 | ||
1438 | /* Get some sensor readings */ | |
861fa773 BH |
1439 | temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor, |
1440 | DS1775_TEMP)) << 8; | |
1da177e4 LT |
1441 | state->last_temp = temp; |
1442 | DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp), | |
1443 | FIX32TOPRINT(DRIVES_PID_INPUT_TARGET)); | |
1444 | ||
1445 | /* Store temperature and error in history array */ | |
1446 | state->cur_sample = (state->cur_sample + 1) % DRIVES_PID_HISTORY_SIZE; | |
1447 | state->sample_history[state->cur_sample] = temp; | |
1448 | state->error_history[state->cur_sample] = temp - DRIVES_PID_INPUT_TARGET; | |
1449 | ||
1450 | /* If first loop, fill the history table */ | |
1451 | if (state->first) { | |
1452 | for (i = 0; i < (DRIVES_PID_HISTORY_SIZE - 1); i++) { | |
1453 | state->cur_sample = (state->cur_sample + 1) % | |
1454 | DRIVES_PID_HISTORY_SIZE; | |
1455 | state->sample_history[state->cur_sample] = temp; | |
1456 | state->error_history[state->cur_sample] = | |
1457 | temp - DRIVES_PID_INPUT_TARGET; | |
1458 | } | |
1459 | state->first = 0; | |
1460 | } | |
1461 | ||
1462 | /* Calculate the integral term */ | |
1463 | sum = 0; | |
1464 | integral = 0; | |
1465 | for (i = 0; i < DRIVES_PID_HISTORY_SIZE; i++) | |
1466 | integral += state->error_history[i]; | |
1467 | integral *= DRIVES_PID_INTERVAL; | |
1468 | DBG(" integral: %08x\n", integral); | |
1469 | integ_p = ((s64)DRIVES_PID_G_r) * (s64)integral; | |
1470 | DBG(" integ_p: %d\n", (int)(integ_p >> 36)); | |
1471 | sum += integ_p; | |
1472 | ||
1473 | /* Calculate the derivative term */ | |
1474 | derivative = state->error_history[state->cur_sample] - | |
1475 | state->error_history[(state->cur_sample + DRIVES_PID_HISTORY_SIZE - 1) | |
1476 | % DRIVES_PID_HISTORY_SIZE]; | |
1477 | derivative /= DRIVES_PID_INTERVAL; | |
1478 | deriv_p = ((s64)DRIVES_PID_G_d) * (s64)derivative; | |
1479 | DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); | |
1480 | sum += deriv_p; | |
1481 | ||
1482 | /* Calculate the proportional term */ | |
1483 | prop_p = ((s64)DRIVES_PID_G_p) * (s64)(state->error_history[state->cur_sample]); | |
1484 | DBG(" prop_p: %d\n", (int)(prop_p >> 36)); | |
1485 | sum += prop_p; | |
1486 | ||
1487 | /* Scale sum */ | |
1488 | sum >>= 36; | |
1489 | ||
1490 | DBG(" sum: %d\n", (int)sum); | |
1491 | state->rpm += (s32)sum; | |
1492 | ||
1493 | state->rpm = max(state->rpm, DRIVES_PID_OUTPUT_MIN); | |
1494 | state->rpm = min(state->rpm, DRIVES_PID_OUTPUT_MAX); | |
1495 | ||
1496 | DBG("** DRIVES RPM: %d\n", (int)state->rpm); | |
1497 | set_rpm_fan(DRIVES_FAN_RPM_INDEX, state->rpm); | |
1498 | } | |
1499 | ||
1500 | /* | |
1501 | * Initialize the state structure for the drives bay fan control loop | |
1502 | */ | |
1503 | static int init_drives_state(struct drives_pid_state *state) | |
1504 | { | |
97759e49 SR |
1505 | int err; |
1506 | ||
1da177e4 LT |
1507 | state->ticks = 1; |
1508 | state->first = 1; | |
1509 | state->rpm = 1000; | |
1510 | ||
1511 | state->monitor = attach_i2c_chip(DRIVES_DALLAS_ID, "drives_temp"); | |
1512 | if (state->monitor == NULL) | |
1513 | return -ENODEV; | |
1514 | ||
97759e49 SR |
1515 | err = device_create_file(&of_dev->dev, &dev_attr_drives_temperature); |
1516 | err |= device_create_file(&of_dev->dev, &dev_attr_drives_fan_rpm); | |
1517 | if (err) | |
1518 | printk(KERN_WARNING "Failed to create attribute file(s)" | |
1519 | " for drives bay fan\n"); | |
1da177e4 LT |
1520 | |
1521 | return 0; | |
1522 | } | |
1523 | ||
1524 | /* | |
1525 | * Dispose of the state data for the drives control loop | |
1526 | */ | |
1527 | static void dispose_drives_state(struct drives_pid_state *state) | |
1528 | { | |
1529 | if (state->monitor == NULL) | |
1530 | return; | |
1531 | ||
1532 | device_remove_file(&of_dev->dev, &dev_attr_drives_temperature); | |
1533 | device_remove_file(&of_dev->dev, &dev_attr_drives_fan_rpm); | |
1534 | ||
1535 | detach_i2c_chip(state->monitor); | |
1536 | state->monitor = NULL; | |
1537 | } | |
1538 | ||
1539 | /* | |
1540 | * DIMMs temp control loop | |
1541 | */ | |
1542 | static void do_monitor_dimms(struct dimm_pid_state *state) | |
1543 | { | |
1544 | s32 temp, integral, derivative, fan_min; | |
1545 | s64 integ_p, deriv_p, prop_p, sum; | |
1546 | int i; | |
1547 | ||
1548 | if (--state->ticks != 0) | |
1549 | return; | |
1550 | state->ticks = DIMM_PID_INTERVAL; | |
1551 | ||
1552 | DBG("DIMM:\n"); | |
1553 | ||
1554 | DBG(" current value: %d\n", state->output); | |
1555 | ||
1556 | temp = read_lm87_reg(state->monitor, LM87_INT_TEMP); | |
1557 | if (temp < 0) | |
1558 | return; | |
1559 | temp <<= 16; | |
1560 | state->last_temp = temp; | |
1561 | DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp), | |
1562 | FIX32TOPRINT(DIMM_PID_INPUT_TARGET)); | |
1563 | ||
1564 | /* Store temperature and error in history array */ | |
1565 | state->cur_sample = (state->cur_sample + 1) % DIMM_PID_HISTORY_SIZE; | |
1566 | state->sample_history[state->cur_sample] = temp; | |
1567 | state->error_history[state->cur_sample] = temp - DIMM_PID_INPUT_TARGET; | |
1568 | ||
1569 | /* If first loop, fill the history table */ | |
1570 | if (state->first) { | |
1571 | for (i = 0; i < (DIMM_PID_HISTORY_SIZE - 1); i++) { | |
1572 | state->cur_sample = (state->cur_sample + 1) % | |
1573 | DIMM_PID_HISTORY_SIZE; | |
1574 | state->sample_history[state->cur_sample] = temp; | |
1575 | state->error_history[state->cur_sample] = | |
1576 | temp - DIMM_PID_INPUT_TARGET; | |
1577 | } | |
1578 | state->first = 0; | |
1579 | } | |
1580 | ||
1581 | /* Calculate the integral term */ | |
1582 | sum = 0; | |
1583 | integral = 0; | |
1584 | for (i = 0; i < DIMM_PID_HISTORY_SIZE; i++) | |
1585 | integral += state->error_history[i]; | |
1586 | integral *= DIMM_PID_INTERVAL; | |
1587 | DBG(" integral: %08x\n", integral); | |
1588 | integ_p = ((s64)DIMM_PID_G_r) * (s64)integral; | |
1589 | DBG(" integ_p: %d\n", (int)(integ_p >> 36)); | |
1590 | sum += integ_p; | |
1591 | ||
1592 | /* Calculate the derivative term */ | |
1593 | derivative = state->error_history[state->cur_sample] - | |
1594 | state->error_history[(state->cur_sample + DIMM_PID_HISTORY_SIZE - 1) | |
1595 | % DIMM_PID_HISTORY_SIZE]; | |
1596 | derivative /= DIMM_PID_INTERVAL; | |
1597 | deriv_p = ((s64)DIMM_PID_G_d) * (s64)derivative; | |
1598 | DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); | |
1599 | sum += deriv_p; | |
1600 | ||
1601 | /* Calculate the proportional term */ | |
1602 | prop_p = ((s64)DIMM_PID_G_p) * (s64)(state->error_history[state->cur_sample]); | |
1603 | DBG(" prop_p: %d\n", (int)(prop_p >> 36)); | |
1604 | sum += prop_p; | |
1605 | ||
1606 | /* Scale sum */ | |
1607 | sum >>= 36; | |
1608 | ||
1609 | DBG(" sum: %d\n", (int)sum); | |
1610 | state->output = (s32)sum; | |
1611 | state->output = max(state->output, DIMM_PID_OUTPUT_MIN); | |
1612 | state->output = min(state->output, DIMM_PID_OUTPUT_MAX); | |
1613 | dimm_output_clamp = state->output; | |
1614 | ||
1615 | DBG("** DIMM clamp value: %d\n", (int)state->output); | |
1616 | ||
1617 | /* Backside PID is only every 5 seconds, force backside fan clamping now */ | |
1618 | fan_min = (dimm_output_clamp * 100) / 14000; | |
1619 | fan_min = max(fan_min, backside_params.output_min); | |
1620 | if (backside_state.pwm < fan_min) { | |
1621 | backside_state.pwm = fan_min; | |
1622 | DBG(" -> applying clamp to backside fan now: %d !\n", fan_min); | |
1623 | set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, fan_min); | |
1624 | } | |
1625 | } | |
1626 | ||
1627 | /* | |
1628 | * Initialize the state structure for the DIMM temp control loop | |
1629 | */ | |
1630 | static int init_dimms_state(struct dimm_pid_state *state) | |
1631 | { | |
1632 | state->ticks = 1; | |
1633 | state->first = 1; | |
1634 | state->output = 4000; | |
1635 | ||
1636 | state->monitor = attach_i2c_chip(XSERVE_DIMMS_LM87, "dimms_temp"); | |
1637 | if (state->monitor == NULL) | |
1638 | return -ENODEV; | |
1639 | ||
97759e49 SR |
1640 | if (device_create_file(&of_dev->dev, &dev_attr_dimms_temperature)) |
1641 | printk(KERN_WARNING "Failed to create attribute file" | |
1642 | " for DIMM temperature\n"); | |
1da177e4 LT |
1643 | |
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | /* | |
861fa773 | 1648 | * Dispose of the state data for the DIMM control loop |
1da177e4 LT |
1649 | */ |
1650 | static void dispose_dimms_state(struct dimm_pid_state *state) | |
1651 | { | |
1652 | if (state->monitor == NULL) | |
1653 | return; | |
1654 | ||
1655 | device_remove_file(&of_dev->dev, &dev_attr_dimms_temperature); | |
1656 | ||
1657 | detach_i2c_chip(state->monitor); | |
1658 | state->monitor = NULL; | |
1659 | } | |
1660 | ||
861fa773 BH |
1661 | /* |
1662 | * Slots fan control loop | |
1663 | */ | |
1664 | static void do_monitor_slots(struct slots_pid_state *state) | |
1665 | { | |
1666 | s32 temp, integral, derivative; | |
1667 | s64 integ_p, deriv_p, prop_p, sum; | |
1668 | int i, rc; | |
1669 | ||
1670 | if (--state->ticks != 0) | |
1671 | return; | |
1672 | state->ticks = SLOTS_PID_INTERVAL; | |
1673 | ||
1674 | DBG("slots:\n"); | |
1675 | ||
1676 | /* Check fan status */ | |
1677 | rc = get_pwm_fan(SLOTS_FAN_PWM_INDEX); | |
1678 | if (rc < 0) { | |
1679 | printk(KERN_WARNING "Error %d reading slots fan !\n", rc); | |
1680 | /* XXX What do we do now ? */ | |
1681 | } else | |
1682 | state->pwm = rc; | |
1683 | DBG(" current pwm: %d\n", state->pwm); | |
1684 | ||
1685 | /* Get some sensor readings */ | |
1686 | temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor, | |
1687 | DS1775_TEMP)) << 8; | |
1688 | state->last_temp = temp; | |
1689 | DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp), | |
1690 | FIX32TOPRINT(SLOTS_PID_INPUT_TARGET)); | |
1691 | ||
1692 | /* Store temperature and error in history array */ | |
1693 | state->cur_sample = (state->cur_sample + 1) % SLOTS_PID_HISTORY_SIZE; | |
1694 | state->sample_history[state->cur_sample] = temp; | |
1695 | state->error_history[state->cur_sample] = temp - SLOTS_PID_INPUT_TARGET; | |
1696 | ||
1697 | /* If first loop, fill the history table */ | |
1698 | if (state->first) { | |
1699 | for (i = 0; i < (SLOTS_PID_HISTORY_SIZE - 1); i++) { | |
1700 | state->cur_sample = (state->cur_sample + 1) % | |
1701 | SLOTS_PID_HISTORY_SIZE; | |
1702 | state->sample_history[state->cur_sample] = temp; | |
1703 | state->error_history[state->cur_sample] = | |
1704 | temp - SLOTS_PID_INPUT_TARGET; | |
1705 | } | |
1706 | state->first = 0; | |
1707 | } | |
1708 | ||
1709 | /* Calculate the integral term */ | |
1710 | sum = 0; | |
1711 | integral = 0; | |
1712 | for (i = 0; i < SLOTS_PID_HISTORY_SIZE; i++) | |
1713 | integral += state->error_history[i]; | |
1714 | integral *= SLOTS_PID_INTERVAL; | |
1715 | DBG(" integral: %08x\n", integral); | |
1716 | integ_p = ((s64)SLOTS_PID_G_r) * (s64)integral; | |
1717 | DBG(" integ_p: %d\n", (int)(integ_p >> 36)); | |
1718 | sum += integ_p; | |
1719 | ||
1720 | /* Calculate the derivative term */ | |
1721 | derivative = state->error_history[state->cur_sample] - | |
1722 | state->error_history[(state->cur_sample + SLOTS_PID_HISTORY_SIZE - 1) | |
1723 | % SLOTS_PID_HISTORY_SIZE]; | |
1724 | derivative /= SLOTS_PID_INTERVAL; | |
1725 | deriv_p = ((s64)SLOTS_PID_G_d) * (s64)derivative; | |
1726 | DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); | |
1727 | sum += deriv_p; | |
1728 | ||
1729 | /* Calculate the proportional term */ | |
1730 | prop_p = ((s64)SLOTS_PID_G_p) * (s64)(state->error_history[state->cur_sample]); | |
1731 | DBG(" prop_p: %d\n", (int)(prop_p >> 36)); | |
1732 | sum += prop_p; | |
1733 | ||
1734 | /* Scale sum */ | |
1735 | sum >>= 36; | |
1736 | ||
1737 | DBG(" sum: %d\n", (int)sum); | |
1738 | state->pwm = (s32)sum; | |
1739 | ||
1740 | state->pwm = max(state->pwm, SLOTS_PID_OUTPUT_MIN); | |
1741 | state->pwm = min(state->pwm, SLOTS_PID_OUTPUT_MAX); | |
1742 | ||
1743 | DBG("** DRIVES PWM: %d\n", (int)state->pwm); | |
1744 | set_pwm_fan(SLOTS_FAN_PWM_INDEX, state->pwm); | |
1745 | } | |
1746 | ||
1747 | /* | |
1748 | * Initialize the state structure for the slots bay fan control loop | |
1749 | */ | |
1750 | static int init_slots_state(struct slots_pid_state *state) | |
1751 | { | |
97759e49 SR |
1752 | int err; |
1753 | ||
861fa773 BH |
1754 | state->ticks = 1; |
1755 | state->first = 1; | |
1756 | state->pwm = 50; | |
1757 | ||
1758 | state->monitor = attach_i2c_chip(XSERVE_SLOTS_LM75, "slots_temp"); | |
1759 | if (state->monitor == NULL) | |
1760 | return -ENODEV; | |
1761 | ||
97759e49 SR |
1762 | err = device_create_file(&of_dev->dev, &dev_attr_slots_temperature); |
1763 | err |= device_create_file(&of_dev->dev, &dev_attr_slots_fan_pwm); | |
1764 | if (err) | |
1765 | printk(KERN_WARNING "Failed to create attribute file(s)" | |
1766 | " for slots bay fan\n"); | |
861fa773 BH |
1767 | |
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | /* | |
1772 | * Dispose of the state data for the slots control loop | |
1773 | */ | |
1774 | static void dispose_slots_state(struct slots_pid_state *state) | |
1775 | { | |
1776 | if (state->monitor == NULL) | |
1777 | return; | |
1778 | ||
1779 | device_remove_file(&of_dev->dev, &dev_attr_slots_temperature); | |
1780 | device_remove_file(&of_dev->dev, &dev_attr_slots_fan_pwm); | |
1781 | ||
1782 | detach_i2c_chip(state->monitor); | |
1783 | state->monitor = NULL; | |
1784 | } | |
1785 | ||
1786 | ||
1da177e4 LT |
1787 | static int call_critical_overtemp(void) |
1788 | { | |
1789 | char *argv[] = { critical_overtemp_path, NULL }; | |
1790 | static char *envp[] = { "HOME=/", | |
1791 | "TERM=linux", | |
1792 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin", | |
1793 | NULL }; | |
1794 | ||
86313c48 JF |
1795 | return call_usermodehelper(critical_overtemp_path, |
1796 | argv, envp, UMH_WAIT_EXEC); | |
1da177e4 LT |
1797 | } |
1798 | ||
1799 | ||
1800 | /* | |
1801 | * Here's the kernel thread that calls the various control loops | |
1802 | */ | |
1803 | static int main_control_loop(void *x) | |
1804 | { | |
1da177e4 LT |
1805 | DBG("main_control_loop started\n"); |
1806 | ||
0885cb56 | 1807 | mutex_lock(&driver_lock); |
1da177e4 LT |
1808 | |
1809 | if (start_fcu() < 0) { | |
1810 | printk(KERN_ERR "kfand: failed to start FCU\n"); | |
0885cb56 | 1811 | mutex_unlock(&driver_lock); |
1da177e4 LT |
1812 | goto out; |
1813 | } | |
1814 | ||
861fa773 BH |
1815 | /* Set the PCI fan once for now on non-RackMac */ |
1816 | if (!rackmac) | |
1817 | set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM); | |
1da177e4 LT |
1818 | |
1819 | /* Initialize ADCs */ | |
1820 | initialize_adc(&cpu_state[0]); | |
1821 | if (cpu_state[1].monitor != NULL) | |
1822 | initialize_adc(&cpu_state[1]); | |
1823 | ||
861fa773 BH |
1824 | fcu_tickle_ticks = FCU_TICKLE_TICKS; |
1825 | ||
0885cb56 | 1826 | mutex_unlock(&driver_lock); |
1da177e4 LT |
1827 | |
1828 | while (state == state_attached) { | |
1829 | unsigned long elapsed, start; | |
1830 | ||
1831 | start = jiffies; | |
1832 | ||
0885cb56 | 1833 | mutex_lock(&driver_lock); |
1da177e4 | 1834 | |
861fa773 BH |
1835 | /* Tickle the FCU just in case */ |
1836 | if (--fcu_tickle_ticks < 0) { | |
1837 | fcu_tickle_ticks = FCU_TICKLE_TICKS; | |
1838 | tickle_fcu(); | |
1839 | } | |
1840 | ||
1da177e4 LT |
1841 | /* First, we always calculate the new DIMMs state on an Xserve */ |
1842 | if (rackmac) | |
1843 | do_monitor_dimms(&dimms_state); | |
1844 | ||
1845 | /* Then, the CPUs */ | |
1846 | if (cpu_pid_type == CPU_PID_TYPE_COMBINED) | |
1847 | do_monitor_cpu_combined(); | |
1848 | else if (cpu_pid_type == CPU_PID_TYPE_RACKMAC) { | |
1849 | do_monitor_cpu_rack(&cpu_state[0]); | |
1850 | if (cpu_state[1].monitor != NULL) | |
1851 | do_monitor_cpu_rack(&cpu_state[1]); | |
1852 | // better deal with UP | |
1853 | } else { | |
1854 | do_monitor_cpu_split(&cpu_state[0]); | |
1855 | if (cpu_state[1].monitor != NULL) | |
1856 | do_monitor_cpu_split(&cpu_state[1]); | |
1857 | // better deal with UP | |
1858 | } | |
1859 | /* Then, the rest */ | |
1860 | do_monitor_backside(&backside_state); | |
861fa773 BH |
1861 | if (rackmac) |
1862 | do_monitor_slots(&slots_state); | |
1863 | else | |
1da177e4 | 1864 | do_monitor_drives(&drives_state); |
0885cb56 | 1865 | mutex_unlock(&driver_lock); |
1da177e4 LT |
1866 | |
1867 | if (critical_state == 1) { | |
1868 | printk(KERN_WARNING "Temperature control detected a critical condition\n"); | |
1869 | printk(KERN_WARNING "Attempting to shut down...\n"); | |
1870 | if (call_critical_overtemp()) { | |
1871 | printk(KERN_WARNING "Can't call %s, power off now!\n", | |
1872 | critical_overtemp_path); | |
1873 | machine_power_off(); | |
1874 | } | |
1875 | } | |
1876 | if (critical_state > 0) | |
1877 | critical_state++; | |
1878 | if (critical_state > MAX_CRITICAL_STATE) { | |
1879 | printk(KERN_WARNING "Shutdown timed out, power off now !\n"); | |
1880 | machine_power_off(); | |
1881 | } | |
1882 | ||
1883 | // FIXME: Deal with signals | |
1da177e4 LT |
1884 | elapsed = jiffies - start; |
1885 | if (elapsed < HZ) | |
12621a16 | 1886 | schedule_timeout_interruptible(HZ - elapsed); |
1da177e4 LT |
1887 | } |
1888 | ||
1889 | out: | |
1890 | DBG("main_control_loop ended\n"); | |
1891 | ||
1892 | ctrl_task = 0; | |
1893 | complete_and_exit(&ctrl_complete, 0); | |
1894 | } | |
1895 | ||
1896 | /* | |
1897 | * Dispose the control loops when tearing down | |
1898 | */ | |
1899 | static void dispose_control_loops(void) | |
1900 | { | |
1901 | dispose_cpu_state(&cpu_state[0]); | |
1902 | dispose_cpu_state(&cpu_state[1]); | |
1903 | dispose_backside_state(&backside_state); | |
1904 | dispose_drives_state(&drives_state); | |
861fa773 | 1905 | dispose_slots_state(&slots_state); |
1da177e4 LT |
1906 | dispose_dimms_state(&dimms_state); |
1907 | } | |
1908 | ||
1909 | /* | |
1910 | * Create the control loops. U3-0 i2c bus is up, so we can now | |
1911 | * get to the various sensors | |
1912 | */ | |
1913 | static int create_control_loops(void) | |
1914 | { | |
1915 | struct device_node *np; | |
1916 | ||
1917 | /* Count CPUs from the device-tree, we don't care how many are | |
1918 | * actually used by Linux | |
1919 | */ | |
1920 | cpu_count = 0; | |
1921 | for (np = NULL; NULL != (np = of_find_node_by_type(np, "cpu"));) | |
1922 | cpu_count++; | |
1923 | ||
1924 | DBG("counted %d CPUs in the device-tree\n", cpu_count); | |
1925 | ||
1926 | /* Decide the type of PID algorithm to use based on the presence of | |
1927 | * the pumps, though that may not be the best way, that is good enough | |
1928 | * for now | |
1929 | */ | |
1930 | if (rackmac) | |
1931 | cpu_pid_type = CPU_PID_TYPE_RACKMAC; | |
1932 | else if (machine_is_compatible("PowerMac7,3") | |
1933 | && (cpu_count > 1) | |
1934 | && fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID | |
1935 | && fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID) { | |
1936 | printk(KERN_INFO "Liquid cooling pumps detected, using new algorithm !\n"); | |
1937 | cpu_pid_type = CPU_PID_TYPE_COMBINED; | |
1938 | } else | |
1939 | cpu_pid_type = CPU_PID_TYPE_SPLIT; | |
1940 | ||
1941 | /* Create control loops for everything. If any fail, everything | |
1942 | * fails | |
1943 | */ | |
1944 | if (init_cpu_state(&cpu_state[0], 0)) | |
1945 | goto fail; | |
1946 | if (cpu_pid_type == CPU_PID_TYPE_COMBINED) | |
1947 | fetch_cpu_pumps_minmax(); | |
1948 | ||
1949 | if (cpu_count > 1 && init_cpu_state(&cpu_state[1], 1)) | |
1950 | goto fail; | |
1951 | if (init_backside_state(&backside_state)) | |
1952 | goto fail; | |
1953 | if (rackmac && init_dimms_state(&dimms_state)) | |
1954 | goto fail; | |
861fa773 BH |
1955 | if (rackmac && init_slots_state(&slots_state)) |
1956 | goto fail; | |
1da177e4 LT |
1957 | if (!rackmac && init_drives_state(&drives_state)) |
1958 | goto fail; | |
1959 | ||
1960 | DBG("all control loops up !\n"); | |
1961 | ||
1962 | return 0; | |
1963 | ||
1964 | fail: | |
1965 | DBG("failure creating control loops, disposing\n"); | |
1966 | ||
1967 | dispose_control_loops(); | |
1968 | ||
1969 | return -ENODEV; | |
1970 | } | |
1971 | ||
1972 | /* | |
1973 | * Start the control loops after everything is up, that is create | |
1974 | * the thread that will make them run | |
1975 | */ | |
1976 | static void start_control_loops(void) | |
1977 | { | |
1978 | init_completion(&ctrl_complete); | |
1979 | ||
39d183d8 | 1980 | ctrl_task = kthread_run(main_control_loop, NULL, "kfand"); |
1da177e4 LT |
1981 | } |
1982 | ||
1983 | /* | |
1984 | * Stop the control loops when tearing down | |
1985 | */ | |
1986 | static void stop_control_loops(void) | |
1987 | { | |
39d183d8 | 1988 | if (ctrl_task) |
1da177e4 LT |
1989 | wait_for_completion(&ctrl_complete); |
1990 | } | |
1991 | ||
1992 | /* | |
1993 | * Attach to the i2c FCU after detecting U3-1 bus | |
1994 | */ | |
1995 | static int attach_fcu(void) | |
1996 | { | |
1997 | fcu = attach_i2c_chip(FAN_CTRLER_ID, "fcu"); | |
1998 | if (fcu == NULL) | |
1999 | return -ENODEV; | |
2000 | ||
2001 | DBG("FCU attached\n"); | |
2002 | ||
2003 | return 0; | |
2004 | } | |
2005 | ||
2006 | /* | |
2007 | * Detach from the i2c FCU when tearing down | |
2008 | */ | |
2009 | static void detach_fcu(void) | |
2010 | { | |
2011 | if (fcu) | |
2012 | detach_i2c_chip(fcu); | |
2013 | fcu = NULL; | |
2014 | } | |
2015 | ||
2016 | /* | |
2017 | * Attach to the i2c controller. We probe the various chips based | |
2018 | * on the device-tree nodes and build everything for the driver to | |
2019 | * run, we then kick the driver monitoring thread | |
2020 | */ | |
2021 | static int therm_pm72_attach(struct i2c_adapter *adapter) | |
2022 | { | |
0885cb56 | 2023 | mutex_lock(&driver_lock); |
1da177e4 LT |
2024 | |
2025 | /* Check state */ | |
2026 | if (state == state_detached) | |
2027 | state = state_attaching; | |
2028 | if (state != state_attaching) { | |
0885cb56 | 2029 | mutex_unlock(&driver_lock); |
1da177e4 LT |
2030 | return 0; |
2031 | } | |
2032 | ||
2033 | /* Check if we are looking for one of these */ | |
2034 | if (u3_0 == NULL && !strcmp(adapter->name, "u3 0")) { | |
2035 | u3_0 = adapter; | |
2036 | DBG("found U3-0\n"); | |
2037 | if (k2 || !rackmac) | |
2038 | if (create_control_loops()) | |
2039 | u3_0 = NULL; | |
2040 | } else if (u3_1 == NULL && !strcmp(adapter->name, "u3 1")) { | |
2041 | u3_1 = adapter; | |
2042 | DBG("found U3-1, attaching FCU\n"); | |
2043 | if (attach_fcu()) | |
2044 | u3_1 = NULL; | |
2045 | } else if (k2 == NULL && !strcmp(adapter->name, "mac-io 0")) { | |
2046 | k2 = adapter; | |
2047 | DBG("Found K2\n"); | |
2048 | if (u3_0 && rackmac) | |
2049 | if (create_control_loops()) | |
2050 | k2 = NULL; | |
2051 | } | |
2052 | /* We got all we need, start control loops */ | |
2053 | if (u3_0 != NULL && u3_1 != NULL && (k2 || !rackmac)) { | |
2054 | DBG("everything up, starting control loops\n"); | |
2055 | state = state_attached; | |
2056 | start_control_loops(); | |
2057 | } | |
0885cb56 | 2058 | mutex_unlock(&driver_lock); |
1da177e4 LT |
2059 | |
2060 | return 0; | |
2061 | } | |
2062 | ||
2063 | /* | |
2064 | * Called on every adapter when the driver or the i2c controller | |
2065 | * is going away. | |
2066 | */ | |
2067 | static int therm_pm72_detach(struct i2c_adapter *adapter) | |
2068 | { | |
0885cb56 | 2069 | mutex_lock(&driver_lock); |
1da177e4 LT |
2070 | |
2071 | if (state != state_detached) | |
2072 | state = state_detaching; | |
2073 | ||
2074 | /* Stop control loops if any */ | |
2075 | DBG("stopping control loops\n"); | |
0885cb56 | 2076 | mutex_unlock(&driver_lock); |
1da177e4 | 2077 | stop_control_loops(); |
0885cb56 | 2078 | mutex_lock(&driver_lock); |
1da177e4 LT |
2079 | |
2080 | if (u3_0 != NULL && !strcmp(adapter->name, "u3 0")) { | |
2081 | DBG("lost U3-0, disposing control loops\n"); | |
2082 | dispose_control_loops(); | |
2083 | u3_0 = NULL; | |
2084 | } | |
2085 | ||
2086 | if (u3_1 != NULL && !strcmp(adapter->name, "u3 1")) { | |
2087 | DBG("lost U3-1, detaching FCU\n"); | |
2088 | detach_fcu(); | |
2089 | u3_1 = NULL; | |
2090 | } | |
2091 | if (u3_0 == NULL && u3_1 == NULL) | |
2092 | state = state_detached; | |
2093 | ||
0885cb56 | 2094 | mutex_unlock(&driver_lock); |
1da177e4 LT |
2095 | |
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | static int fan_check_loc_match(const char *loc, int fan) | |
2100 | { | |
2101 | char tmp[64]; | |
2102 | char *c, *e; | |
2103 | ||
2104 | strlcpy(tmp, fcu_fans[fan].loc, 64); | |
2105 | ||
2106 | c = tmp; | |
2107 | for (;;) { | |
2108 | e = strchr(c, ','); | |
2109 | if (e) | |
2110 | *e = 0; | |
2111 | if (strcmp(loc, c) == 0) | |
2112 | return 1; | |
2113 | if (e == NULL) | |
2114 | break; | |
2115 | c = e + 1; | |
2116 | } | |
2117 | return 0; | |
2118 | } | |
2119 | ||
2120 | static void fcu_lookup_fans(struct device_node *fcu_node) | |
2121 | { | |
2122 | struct device_node *np = NULL; | |
2123 | int i; | |
2124 | ||
2125 | /* The table is filled by default with values that are suitable | |
2126 | * for the old machines without device-tree informations. We scan | |
2127 | * the device-tree and override those values with whatever is | |
2128 | * there | |
2129 | */ | |
2130 | ||
2131 | DBG("Looking up FCU controls in device-tree...\n"); | |
2132 | ||
2133 | while ((np = of_get_next_child(fcu_node, np)) != NULL) { | |
2134 | int type = -1; | |
018a3d1d JK |
2135 | const char *loc; |
2136 | const u32 *reg; | |
1da177e4 LT |
2137 | |
2138 | DBG(" control: %s, type: %s\n", np->name, np->type); | |
2139 | ||
2140 | /* Detect control type */ | |
2141 | if (!strcmp(np->type, "fan-rpm-control") || | |
2142 | !strcmp(np->type, "fan-rpm")) | |
2143 | type = FCU_FAN_RPM; | |
2144 | if (!strcmp(np->type, "fan-pwm-control") || | |
2145 | !strcmp(np->type, "fan-pwm")) | |
2146 | type = FCU_FAN_PWM; | |
2147 | /* Only care about fans for now */ | |
2148 | if (type == -1) | |
2149 | continue; | |
2150 | ||
2151 | /* Lookup for a matching location */ | |
01b2726d SR |
2152 | loc = of_get_property(np, "location", NULL); |
2153 | reg = of_get_property(np, "reg", NULL); | |
1da177e4 LT |
2154 | if (loc == NULL || reg == NULL) |
2155 | continue; | |
2156 | DBG(" matching location: %s, reg: 0x%08x\n", loc, *reg); | |
2157 | ||
2158 | for (i = 0; i < FCU_FAN_COUNT; i++) { | |
2159 | int fan_id; | |
2160 | ||
2161 | if (!fan_check_loc_match(loc, i)) | |
2162 | continue; | |
2163 | DBG(" location match, index: %d\n", i); | |
2164 | fcu_fans[i].id = FCU_FAN_ABSENT_ID; | |
2165 | if (type != fcu_fans[i].type) { | |
2166 | printk(KERN_WARNING "therm_pm72: Fan type mismatch " | |
2167 | "in device-tree for %s\n", np->full_name); | |
2168 | break; | |
2169 | } | |
2170 | if (type == FCU_FAN_RPM) | |
2171 | fan_id = ((*reg) - 0x10) / 2; | |
2172 | else | |
2173 | fan_id = ((*reg) - 0x30) / 2; | |
2174 | if (fan_id > 7) { | |
2175 | printk(KERN_WARNING "therm_pm72: Can't parse " | |
2176 | "fan ID in device-tree for %s\n", np->full_name); | |
2177 | break; | |
2178 | } | |
2179 | DBG(" fan id -> %d, type -> %d\n", fan_id, type); | |
2180 | fcu_fans[i].id = fan_id; | |
2181 | } | |
2182 | } | |
2183 | ||
2184 | /* Now dump the array */ | |
2185 | printk(KERN_INFO "Detected fan controls:\n"); | |
2186 | for (i = 0; i < FCU_FAN_COUNT; i++) { | |
2187 | if (fcu_fans[i].id == FCU_FAN_ABSENT_ID) | |
2188 | continue; | |
2189 | printk(KERN_INFO " %d: %s fan, id %d, location: %s\n", i, | |
2190 | fcu_fans[i].type == FCU_FAN_RPM ? "RPM" : "PWM", | |
2191 | fcu_fans[i].id, fcu_fans[i].loc); | |
2192 | } | |
2193 | } | |
2194 | ||
5e655772 | 2195 | static int fcu_of_probe(struct of_device* dev, const struct of_device_id *match) |
1da177e4 | 2196 | { |
1da177e4 LT |
2197 | state = state_detached; |
2198 | ||
2199 | /* Lookup the fans in the device tree */ | |
2200 | fcu_lookup_fans(dev->node); | |
2201 | ||
2202 | /* Add the driver */ | |
c9662b4b | 2203 | return i2c_add_driver(&therm_pm72_driver); |
1da177e4 LT |
2204 | } |
2205 | ||
2206 | static int fcu_of_remove(struct of_device* dev) | |
2207 | { | |
2208 | i2c_del_driver(&therm_pm72_driver); | |
2209 | ||
2210 | return 0; | |
2211 | } | |
2212 | ||
5e655772 | 2213 | static struct of_device_id fcu_match[] = |
1da177e4 LT |
2214 | { |
2215 | { | |
1da177e4 | 2216 | .type = "fcu", |
1da177e4 LT |
2217 | }, |
2218 | {}, | |
2219 | }; | |
2220 | ||
2221 | static struct of_platform_driver fcu_of_platform_driver = | |
2222 | { | |
2223 | .name = "temperature", | |
5e655772 | 2224 | .match_table = fcu_match, |
1da177e4 LT |
2225 | .probe = fcu_of_probe, |
2226 | .remove = fcu_of_remove | |
2227 | }; | |
2228 | ||
2229 | /* | |
2230 | * Check machine type, attach to i2c controller | |
2231 | */ | |
2232 | static int __init therm_pm72_init(void) | |
2233 | { | |
2234 | struct device_node *np; | |
2235 | ||
2236 | rackmac = machine_is_compatible("RackMac3,1"); | |
2237 | ||
2238 | if (!machine_is_compatible("PowerMac7,2") && | |
2239 | !machine_is_compatible("PowerMac7,3") && | |
2240 | !rackmac) | |
2241 | return -ENODEV; | |
2242 | ||
2243 | printk(KERN_INFO "PowerMac G5 Thermal control driver %s\n", VERSION); | |
2244 | ||
2245 | np = of_find_node_by_type(NULL, "fcu"); | |
2246 | if (np == NULL) { | |
2247 | /* Some machines have strangely broken device-tree */ | |
2248 | np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e"); | |
2249 | if (np == NULL) { | |
2250 | printk(KERN_ERR "Can't find FCU in device-tree !\n"); | |
2251 | return -ENODEV; | |
2252 | } | |
2253 | } | |
0365ba7f | 2254 | of_dev = of_platform_device_create(np, "temperature", NULL); |
1da177e4 LT |
2255 | if (of_dev == NULL) { |
2256 | printk(KERN_ERR "Can't register FCU platform device !\n"); | |
2257 | return -ENODEV; | |
2258 | } | |
2259 | ||
7eebde70 | 2260 | of_register_platform_driver(&fcu_of_platform_driver); |
1da177e4 LT |
2261 | |
2262 | return 0; | |
2263 | } | |
2264 | ||
2265 | static void __exit therm_pm72_exit(void) | |
2266 | { | |
7eebde70 | 2267 | of_unregister_platform_driver(&fcu_of_platform_driver); |
1da177e4 LT |
2268 | |
2269 | if (of_dev) | |
2270 | of_device_unregister(of_dev); | |
2271 | } | |
2272 | ||
2273 | module_init(therm_pm72_init); | |
2274 | module_exit(therm_pm72_exit); | |
2275 | ||
2276 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
2277 | MODULE_DESCRIPTION("Driver for Apple's PowerMac G5 thermal control"); | |
2278 | MODULE_LICENSE("GPL"); | |
2279 |