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[POWERPC] Convert therm_pm72.c to use the kthread API
[linux-2.6/kmemtrace.git] / drivers / macintosh / therm_pm72.c
blob6fadc9ac66b0c514d64486261397da80fc3b3cba
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 *
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 *
109 */
110
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>
117 #include <linux/slab.h>
118 #include <linux/init.h>
119 #include <linux/spinlock.h>
120 #include <linux/wait.h>
121 #include <linux/reboot.h>
122 #include <linux/kmod.h>
123 #include <linux/i2c.h>
124 #include <linux/kthread.h>
125 #include <asm/prom.h>
126 #include <asm/machdep.h>
127 #include <asm/io.h>
128 #include <asm/system.h>
129 #include <asm/sections.h>
130 #include <asm/of_device.h>
131 #include <asm/macio.h>
132 #include <asm/of_platform.h>
133
134 #include "therm_pm72.h"
135
136 #define VERSION "1.3"
137
138 #undef DEBUG
139
140 #ifdef DEBUG
141 #define DBG(args...) printk(args)
142 #else
143 #define DBG(args...) do { } while(0)
144 #endif
145
146
147 /*
148 * Driver statics
149 */
150
151 static struct of_device * of_dev;
152 static struct i2c_adapter * u3_0;
153 static struct i2c_adapter * u3_1;
154 static struct i2c_adapter * k2;
155 static struct i2c_client * fcu;
156 static struct cpu_pid_state cpu_state[2];
157 static struct basckside_pid_params backside_params;
158 static struct backside_pid_state backside_state;
159 static struct drives_pid_state drives_state;
160 static struct dimm_pid_state dimms_state;
161 static struct slots_pid_state slots_state;
162 static int state;
163 static int cpu_count;
164 static int cpu_pid_type;
165 static struct task_struct *ctrl_task;
166 static struct completion ctrl_complete;
167 static int critical_state;
168 static int rackmac;
169 static s32 dimm_output_clamp;
170 static int fcu_rpm_shift;
171 static int fcu_tickle_ticks;
172 static DECLARE_MUTEX(driver_lock);
173
174 /*
175 * We have 3 types of CPU PID control. One is "split" old style control
176 * for intake & exhaust fans, the other is "combined" control for both
177 * CPUs that also deals with the pumps when present. To be "compatible"
178 * with OS X at this point, we only use "COMBINED" on the machines that
179 * are identified as having the pumps (though that identification is at
180 * least dodgy). Ultimately, we could probably switch completely to this
181 * algorithm provided we hack it to deal with the UP case
182 */
183 #define CPU_PID_TYPE_SPLIT 0
184 #define CPU_PID_TYPE_COMBINED 1
185 #define CPU_PID_TYPE_RACKMAC 2
186
187 /*
188 * This table describes all fans in the FCU. The "id" and "type" values
189 * are defaults valid for all earlier machines. Newer machines will
190 * eventually override the table content based on the device-tree
191 */
192 struct fcu_fan_table
193 {
194 char* loc; /* location code */
195 int type; /* 0 = rpm, 1 = pwm, 2 = pump */
196 int id; /* id or -1 */
197 };
198
199 #define FCU_FAN_RPM 0
200 #define FCU_FAN_PWM 1
201
202 #define FCU_FAN_ABSENT_ID -1
203
204 #define FCU_FAN_COUNT ARRAY_SIZE(fcu_fans)
205
206 struct fcu_fan_table fcu_fans[] = {
207 [BACKSIDE_FAN_PWM_INDEX] = {
208 .loc = "BACKSIDE,SYS CTRLR FAN",
209 .type = FCU_FAN_PWM,
210 .id = BACKSIDE_FAN_PWM_DEFAULT_ID,
211 },
212 [DRIVES_FAN_RPM_INDEX] = {
213 .loc = "DRIVE BAY",
214 .type = FCU_FAN_RPM,
215 .id = DRIVES_FAN_RPM_DEFAULT_ID,
216 },
217 [SLOTS_FAN_PWM_INDEX] = {
218 .loc = "SLOT,PCI FAN",
219 .type = FCU_FAN_PWM,
220 .id = SLOTS_FAN_PWM_DEFAULT_ID,
221 },
222 [CPUA_INTAKE_FAN_RPM_INDEX] = {
223 .loc = "CPU A INTAKE",
224 .type = FCU_FAN_RPM,
225 .id = CPUA_INTAKE_FAN_RPM_DEFAULT_ID,
226 },
227 [CPUA_EXHAUST_FAN_RPM_INDEX] = {
228 .loc = "CPU A EXHAUST",
229 .type = FCU_FAN_RPM,
230 .id = CPUA_EXHAUST_FAN_RPM_DEFAULT_ID,
231 },
232 [CPUB_INTAKE_FAN_RPM_INDEX] = {
233 .loc = "CPU B INTAKE",
234 .type = FCU_FAN_RPM,
235 .id = CPUB_INTAKE_FAN_RPM_DEFAULT_ID,
236 },
237 [CPUB_EXHAUST_FAN_RPM_INDEX] = {
238 .loc = "CPU B EXHAUST",
239 .type = FCU_FAN_RPM,
240 .id = CPUB_EXHAUST_FAN_RPM_DEFAULT_ID,
241 },
242 /* pumps aren't present by default, have to be looked up in the
243 * device-tree
244 */
245 [CPUA_PUMP_RPM_INDEX] = {
246 .loc = "CPU A PUMP",
247 .type = FCU_FAN_RPM,
248 .id = FCU_FAN_ABSENT_ID,
249 },
250 [CPUB_PUMP_RPM_INDEX] = {
251 .loc = "CPU B PUMP",
252 .type = FCU_FAN_RPM,
253 .id = FCU_FAN_ABSENT_ID,
254 },
255 /* Xserve fans */
256 [CPU_A1_FAN_RPM_INDEX] = {
257 .loc = "CPU A 1",
258 .type = FCU_FAN_RPM,
259 .id = FCU_FAN_ABSENT_ID,
260 },
261 [CPU_A2_FAN_RPM_INDEX] = {
262 .loc = "CPU A 2",
263 .type = FCU_FAN_RPM,
264 .id = FCU_FAN_ABSENT_ID,
265 },
266 [CPU_A3_FAN_RPM_INDEX] = {
267 .loc = "CPU A 3",
268 .type = FCU_FAN_RPM,
269 .id = FCU_FAN_ABSENT_ID,
270 },
271 [CPU_B1_FAN_RPM_INDEX] = {
272 .loc = "CPU B 1",
273 .type = FCU_FAN_RPM,
274 .id = FCU_FAN_ABSENT_ID,
275 },
276 [CPU_B2_FAN_RPM_INDEX] = {
277 .loc = "CPU B 2",
278 .type = FCU_FAN_RPM,
279 .id = FCU_FAN_ABSENT_ID,
280 },
281 [CPU_B3_FAN_RPM_INDEX] = {
282 .loc = "CPU B 3",
283 .type = FCU_FAN_RPM,
284 .id = FCU_FAN_ABSENT_ID,
285 },
286 };
287
288 /*
289 * i2c_driver structure to attach to the host i2c controller
290 */
291
292 static int therm_pm72_attach(struct i2c_adapter *adapter);
293 static int therm_pm72_detach(struct i2c_adapter *adapter);
294
295 static struct i2c_driver therm_pm72_driver =
296 {
297 .driver = {
298 .name = "therm_pm72",
299 },
300 .attach_adapter = therm_pm72_attach,
301 .detach_adapter = therm_pm72_detach,
302 };
303
304 /*
305 * Utility function to create an i2c_client structure and
306 * attach it to one of u3 adapters
307 */
308 static struct i2c_client *attach_i2c_chip(int id, const char *name)
309 {
310 struct i2c_client *clt;
311 struct i2c_adapter *adap;
312
313 if (id & 0x200)
314 adap = k2;
315 else if (id & 0x100)
316 adap = u3_1;
317 else
318 adap = u3_0;
319 if (adap == NULL)
320 return NULL;
321
322 clt = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
323 if (clt == NULL)
324 return NULL;
325
326 clt->addr = (id >> 1) & 0x7f;
327 clt->adapter = adap;
328 clt->driver = &therm_pm72_driver;
329 strncpy(clt->name, name, I2C_NAME_SIZE-1);
330
331 if (i2c_attach_client(clt)) {
332 printk(KERN_ERR "therm_pm72: Failed to attach to i2c ID 0x%x\n", id);
333 kfree(clt);
334 return NULL;
335 }
336 return clt;
337 }
338
339 /*
340 * Utility function to get rid of the i2c_client structure
341 * (will also detach from the adapter hopepfully)
342 */
343 static void detach_i2c_chip(struct i2c_client *clt)
344 {
345 i2c_detach_client(clt);
346 kfree(clt);
347 }
348
349 /*
350 * Here are the i2c chip access wrappers
351 */
352
353 static void initialize_adc(struct cpu_pid_state *state)
354 {
355 int rc;
356 u8 buf[2];
357
358 /* Read ADC the configuration register and cache it. We
359 * also make sure Config2 contains proper values, I've seen
360 * cases where we got stale grabage in there, thus preventing
361 * proper reading of conv. values
362 */
363
364 /* Clear Config2 */
365 buf[0] = 5;
366 buf[1] = 0;
367 i2c_master_send(state->monitor, buf, 2);
368
369 /* Read & cache Config1 */
370 buf[0] = 1;
371 rc = i2c_master_send(state->monitor, buf, 1);
372 if (rc > 0) {
373 rc = i2c_master_recv(state->monitor, buf, 1);
374 if (rc > 0) {
375 state->adc_config = buf[0];
376 DBG("ADC config reg: %02x\n", state->adc_config);
377 /* Disable shutdown mode */
378 state->adc_config &= 0xfe;
379 buf[0] = 1;
380 buf[1] = state->adc_config;
381 rc = i2c_master_send(state->monitor, buf, 2);
382 }
383 }
384 if (rc <= 0)
385 printk(KERN_ERR "therm_pm72: Error reading ADC config"
386 " register !\n");
387 }
388
389 static int read_smon_adc(struct cpu_pid_state *state, int chan)
390 {
391 int rc, data, tries = 0;
392 u8 buf[2];
393
394 for (;;) {
395 /* Set channel */
396 buf[0] = 1;
397 buf[1] = (state->adc_config & 0x1f) | (chan << 5);
398 rc = i2c_master_send(state->monitor, buf, 2);
399 if (rc <= 0)
400 goto error;
401 /* Wait for convertion */
402 msleep(1);
403 /* Switch to data register */
404 buf[0] = 4;
405 rc = i2c_master_send(state->monitor, buf, 1);
406 if (rc <= 0)
407 goto error;
408 /* Read result */
409 rc = i2c_master_recv(state->monitor, buf, 2);
410 if (rc < 0)
411 goto error;
412 data = ((u16)buf[0]) << 8 | (u16)buf[1];
413 return data >> 6;
414 error:
415 DBG("Error reading ADC, retrying...\n");
416 if (++tries > 10) {
417 printk(KERN_ERR "therm_pm72: Error reading ADC !\n");
418 return -1;
419 }
420 msleep(10);
421 }
422 }
423
424 static int read_lm87_reg(struct i2c_client * chip, int reg)
425 {
426 int rc, tries = 0;
427 u8 buf;
428
429 for (;;) {
430 /* Set address */
431 buf = (u8)reg;
432 rc = i2c_master_send(chip, &buf, 1);
433 if (rc <= 0)
434 goto error;
435 rc = i2c_master_recv(chip, &buf, 1);
436 if (rc <= 0)
437 goto error;
438 return (int)buf;
439 error:
440 DBG("Error reading LM87, retrying...\n");
441 if (++tries > 10) {
442 printk(KERN_ERR "therm_pm72: Error reading LM87 !\n");
443 return -1;
444 }
445 msleep(10);
446 }
447 }
448
449 static int fan_read_reg(int reg, unsigned char *buf, int nb)
450 {
451 int tries, nr, nw;
452
453 buf[0] = reg;
454 tries = 0;
455 for (;;) {
456 nw = i2c_master_send(fcu, buf, 1);
457 if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100)
458 break;
459 msleep(10);
460 ++tries;
461 }
462 if (nw <= 0) {
463 printk(KERN_ERR "Failure writing address to FCU: %d", nw);
464 return -EIO;
465 }
466 tries = 0;
467 for (;;) {
468 nr = i2c_master_recv(fcu, buf, nb);
469 if (nr > 0 || (nr < 0 && nr != ENODEV) || tries >= 100)
470 break;
471 msleep(10);
472 ++tries;
473 }
474 if (nr <= 0)
475 printk(KERN_ERR "Failure reading data from FCU: %d", nw);
476 return nr;
477 }
478
479 static int fan_write_reg(int reg, const unsigned char *ptr, int nb)
480 {
481 int tries, nw;
482 unsigned char buf[16];
483
484 buf[0] = reg;
485 memcpy(buf+1, ptr, nb);
486 ++nb;
487 tries = 0;
488 for (;;) {
489 nw = i2c_master_send(fcu, buf, nb);
490 if (nw > 0 || (nw < 0 && nw != EIO) || tries >= 100)
491 break;
492 msleep(10);
493 ++tries;
494 }
495 if (nw < 0)
496 printk(KERN_ERR "Failure writing to FCU: %d", nw);
497 return nw;
498 }
499
500 static int start_fcu(void)
501 {
502 unsigned char buf = 0xff;
503 int rc;
504
505 rc = fan_write_reg(0xe, &buf, 1);
506 if (rc < 0)
507 return -EIO;
508 rc = fan_write_reg(0x2e, &buf, 1);
509 if (rc < 0)
510 return -EIO;
511 rc = fan_read_reg(0, &buf, 1);
512 if (rc < 0)
513 return -EIO;
514 fcu_rpm_shift = (buf == 1) ? 2 : 3;
515 printk(KERN_DEBUG "FCU Initialized, RPM fan shift is %d\n",
516 fcu_rpm_shift);
517
518 return 0;
519 }
520
521 static int set_rpm_fan(int fan_index, int rpm)
522 {
523 unsigned char buf[2];
524 int rc, id, min, max;
525
526 if (fcu_fans[fan_index].type != FCU_FAN_RPM)
527 return -EINVAL;
528 id = fcu_fans[fan_index].id;
529 if (id == FCU_FAN_ABSENT_ID)
530 return -EINVAL;
531
532 min = 2400 >> fcu_rpm_shift;
533 max = 56000 >> fcu_rpm_shift;
534
535 if (rpm < min)
536 rpm = min;
537 else if (rpm > max)
538 rpm = max;
539 buf[0] = rpm >> (8 - fcu_rpm_shift);
540 buf[1] = rpm << fcu_rpm_shift;
541 rc = fan_write_reg(0x10 + (id * 2), buf, 2);
542 if (rc < 0)
543 return -EIO;
544 return 0;
545 }
546
547 static int get_rpm_fan(int fan_index, int programmed)
548 {
549 unsigned char failure;
550 unsigned char active;
551 unsigned char buf[2];
552 int rc, id, reg_base;
553
554 if (fcu_fans[fan_index].type != FCU_FAN_RPM)
555 return -EINVAL;
556 id = fcu_fans[fan_index].id;
557 if (id == FCU_FAN_ABSENT_ID)
558 return -EINVAL;
559
560 rc = fan_read_reg(0xb, &failure, 1);
561 if (rc != 1)
562 return -EIO;
563 if ((failure & (1 << id)) != 0)
564 return -EFAULT;
565 rc = fan_read_reg(0xd, &active, 1);
566 if (rc != 1)
567 return -EIO;
568 if ((active & (1 << id)) == 0)
569 return -ENXIO;
570
571 /* Programmed value or real current speed */
572 reg_base = programmed ? 0x10 : 0x11;
573 rc = fan_read_reg(reg_base + (id * 2), buf, 2);
574 if (rc != 2)
575 return -EIO;
576
577 return (buf[0] << (8 - fcu_rpm_shift)) | buf[1] >> fcu_rpm_shift;
578 }
579
580 static int set_pwm_fan(int fan_index, int pwm)
581 {
582 unsigned char buf[2];
583 int rc, id;
584
585 if (fcu_fans[fan_index].type != FCU_FAN_PWM)
586 return -EINVAL;
587 id = fcu_fans[fan_index].id;
588 if (id == FCU_FAN_ABSENT_ID)
589 return -EINVAL;
590
591 if (pwm < 10)
592 pwm = 10;
593 else if (pwm > 100)
594 pwm = 100;
595 pwm = (pwm * 2559) / 1000;
596 buf[0] = pwm;
597 rc = fan_write_reg(0x30 + (id * 2), buf, 1);
598 if (rc < 0)
599 return rc;
600 return 0;
601 }
602
603 static int get_pwm_fan(int fan_index)
604 {
605 unsigned char failure;
606 unsigned char active;
607 unsigned char buf[2];
608 int rc, id;
609
610 if (fcu_fans[fan_index].type != FCU_FAN_PWM)
611 return -EINVAL;
612 id = fcu_fans[fan_index].id;
613 if (id == FCU_FAN_ABSENT_ID)
614 return -EINVAL;
615
616 rc = fan_read_reg(0x2b, &failure, 1);
617 if (rc != 1)
618 return -EIO;
619 if ((failure & (1 << id)) != 0)
620 return -EFAULT;
621 rc = fan_read_reg(0x2d, &active, 1);
622 if (rc != 1)
623 return -EIO;
624 if ((active & (1 << id)) == 0)
625 return -ENXIO;
626
627 /* Programmed value or real current speed */
628 rc = fan_read_reg(0x30 + (id * 2), buf, 1);
629 if (rc != 1)
630 return -EIO;
631
632 return (buf[0] * 1000) / 2559;
633 }
634
635 static void tickle_fcu(void)
636 {
637 int pwm;
638
639 pwm = get_pwm_fan(SLOTS_FAN_PWM_INDEX);
640
641 DBG("FCU Tickle, slots fan is: %d\n", pwm);
642 if (pwm < 0)
643 pwm = 100;
644
645 if (!rackmac) {
646 pwm = SLOTS_FAN_DEFAULT_PWM;
647 } else if (pwm < SLOTS_PID_OUTPUT_MIN)
648 pwm = SLOTS_PID_OUTPUT_MIN;
649
650 /* That is hopefully enough to make the FCU happy */
651 set_pwm_fan(SLOTS_FAN_PWM_INDEX, pwm);
652 }
653
654
655 /*
656 * Utility routine to read the CPU calibration EEPROM data
657 * from the device-tree
658 */
659 static int read_eeprom(int cpu, struct mpu_data *out)
660 {
661 struct device_node *np;
662 char nodename[64];
663 const u8 *data;
664 int len;
665
666 /* prom.c routine for finding a node by path is a bit brain dead
667 * and requires exact @xxx unit numbers. This is a bit ugly but
668 * will work for these machines
669 */
670 sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0);
671 np = of_find_node_by_path(nodename);
672 if (np == NULL) {
673 printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid node from device-tree\n");
674 return -ENODEV;
675 }
676 data = of_get_property(np, "cpuid", &len);
677 if (data == NULL) {
678 printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid property from device-tree\n");
679 of_node_put(np);
680 return -ENODEV;
681 }
682 memcpy(out, data, sizeof(struct mpu_data));
683 of_node_put(np);
684
685 return 0;
686 }
687
688 static void fetch_cpu_pumps_minmax(void)
689 {
690 struct cpu_pid_state *state0 = &cpu_state[0];
691 struct cpu_pid_state *state1 = &cpu_state[1];
692 u16 pump_min = 0, pump_max = 0xffff;
693 u16 tmp[4];
694
695 /* Try to fetch pumps min/max infos from eeprom */
696
697 memcpy(&tmp, &state0->mpu.processor_part_num, 8);
698 if (tmp[0] != 0xffff && tmp[1] != 0xffff) {
699 pump_min = max(pump_min, tmp[0]);
700 pump_max = min(pump_max, tmp[1]);
701 }
702 if (tmp[2] != 0xffff && tmp[3] != 0xffff) {
703 pump_min = max(pump_min, tmp[2]);
704 pump_max = min(pump_max, tmp[3]);
705 }
706
707 /* Double check the values, this _IS_ needed as the EEPROM on
708 * some dual 2.5Ghz G5s seem, at least, to have both min & max
709 * same to the same value ... (grrrr)
710 */
711 if (pump_min == pump_max || pump_min == 0 || pump_max == 0xffff) {
712 pump_min = CPU_PUMP_OUTPUT_MIN;
713 pump_max = CPU_PUMP_OUTPUT_MAX;
714 }
715
716 state0->pump_min = state1->pump_min = pump_min;
717 state0->pump_max = state1->pump_max = pump_max;
718 }
719
720 /*
721 * Now, unfortunately, sysfs doesn't give us a nice void * we could
722 * pass around to the attribute functions, so we don't really have
723 * choice but implement a bunch of them...
724 *
725 * That sucks a bit, we take the lock because FIX32TOPRINT evaluates
726 * the input twice... I accept patches :)
727 */
728 #define BUILD_SHOW_FUNC_FIX(name, data) \
729 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
730 { \
731 ssize_t r; \
732 down(&driver_lock); \
733 r = sprintf(buf, "%d.%03d", FIX32TOPRINT(data)); \
734 up(&driver_lock); \
735 return r; \
736 }
737 #define BUILD_SHOW_FUNC_INT(name, data) \
738 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
739 { \
740 return sprintf(buf, "%d", data); \
741 }
742
743 BUILD_SHOW_FUNC_FIX(cpu0_temperature, cpu_state[0].last_temp)
744 BUILD_SHOW_FUNC_FIX(cpu0_voltage, cpu_state[0].voltage)
745 BUILD_SHOW_FUNC_FIX(cpu0_current, cpu_state[0].current_a)
746 BUILD_SHOW_FUNC_INT(cpu0_exhaust_fan_rpm, cpu_state[0].rpm)
747 BUILD_SHOW_FUNC_INT(cpu0_intake_fan_rpm, cpu_state[0].intake_rpm)
748
749 BUILD_SHOW_FUNC_FIX(cpu1_temperature, cpu_state[1].last_temp)
750 BUILD_SHOW_FUNC_FIX(cpu1_voltage, cpu_state[1].voltage)
751 BUILD_SHOW_FUNC_FIX(cpu1_current, cpu_state[1].current_a)
752 BUILD_SHOW_FUNC_INT(cpu1_exhaust_fan_rpm, cpu_state[1].rpm)
753 BUILD_SHOW_FUNC_INT(cpu1_intake_fan_rpm, cpu_state[1].intake_rpm)
754
755 BUILD_SHOW_FUNC_FIX(backside_temperature, backside_state.last_temp)
756 BUILD_SHOW_FUNC_INT(backside_fan_pwm, backside_state.pwm)
757
758 BUILD_SHOW_FUNC_FIX(drives_temperature, drives_state.last_temp)
759 BUILD_SHOW_FUNC_INT(drives_fan_rpm, drives_state.rpm)
760
761 BUILD_SHOW_FUNC_FIX(slots_temperature, slots_state.last_temp)
762 BUILD_SHOW_FUNC_INT(slots_fan_pwm, slots_state.pwm)
763
764 BUILD_SHOW_FUNC_FIX(dimms_temperature, dimms_state.last_temp)
765
766 static DEVICE_ATTR(cpu0_temperature,S_IRUGO,show_cpu0_temperature,NULL);
767 static DEVICE_ATTR(cpu0_voltage,S_IRUGO,show_cpu0_voltage,NULL);
768 static DEVICE_ATTR(cpu0_current,S_IRUGO,show_cpu0_current,NULL);
769 static DEVICE_ATTR(cpu0_exhaust_fan_rpm,S_IRUGO,show_cpu0_exhaust_fan_rpm,NULL);
770 static DEVICE_ATTR(cpu0_intake_fan_rpm,S_IRUGO,show_cpu0_intake_fan_rpm,NULL);
771
772 static DEVICE_ATTR(cpu1_temperature,S_IRUGO,show_cpu1_temperature,NULL);
773 static DEVICE_ATTR(cpu1_voltage,S_IRUGO,show_cpu1_voltage,NULL);
774 static DEVICE_ATTR(cpu1_current,S_IRUGO,show_cpu1_current,NULL);
775 static DEVICE_ATTR(cpu1_exhaust_fan_rpm,S_IRUGO,show_cpu1_exhaust_fan_rpm,NULL);
776 static DEVICE_ATTR(cpu1_intake_fan_rpm,S_IRUGO,show_cpu1_intake_fan_rpm,NULL);
777
778 static DEVICE_ATTR(backside_temperature,S_IRUGO,show_backside_temperature,NULL);
779 static DEVICE_ATTR(backside_fan_pwm,S_IRUGO,show_backside_fan_pwm,NULL);
780
781 static DEVICE_ATTR(drives_temperature,S_IRUGO,show_drives_temperature,NULL);
782 static DEVICE_ATTR(drives_fan_rpm,S_IRUGO,show_drives_fan_rpm,NULL);
783
784 static DEVICE_ATTR(slots_temperature,S_IRUGO,show_slots_temperature,NULL);
785 static DEVICE_ATTR(slots_fan_pwm,S_IRUGO,show_slots_fan_pwm,NULL);
786
787 static DEVICE_ATTR(dimms_temperature,S_IRUGO,show_dimms_temperature,NULL);
788
789 /*
790 * CPUs fans control loop
791 */
792
793 static int do_read_one_cpu_values(struct cpu_pid_state *state, s32 *temp, s32 *power)
794 {
795 s32 ltemp, volts, amps;
796 int index, rc = 0;
797
798 /* Default (in case of error) */
799 *temp = state->cur_temp;
800 *power = state->cur_power;
801
802 if (cpu_pid_type == CPU_PID_TYPE_RACKMAC)
803 index = (state->index == 0) ?
804 CPU_A1_FAN_RPM_INDEX : CPU_B1_FAN_RPM_INDEX;
805 else
806 index = (state->index == 0) ?
807 CPUA_EXHAUST_FAN_RPM_INDEX : CPUB_EXHAUST_FAN_RPM_INDEX;
808
809 /* Read current fan status */
810 rc = get_rpm_fan(index, !RPM_PID_USE_ACTUAL_SPEED);
811 if (rc < 0) {
812 /* XXX What do we do now ? Nothing for now, keep old value, but
813 * return error upstream
814 */
815 DBG(" cpu %d, fan reading error !\n", state->index);
816 } else {
817 state->rpm = rc;
818 DBG(" cpu %d, exhaust RPM: %d\n", state->index, state->rpm);
819 }
820
821 /* Get some sensor readings and scale it */
822 ltemp = read_smon_adc(state, 1);
823 if (ltemp == -1) {
824 /* XXX What do we do now ? */
825 state->overtemp++;
826 if (rc == 0)
827 rc = -EIO;
828 DBG(" cpu %d, temp reading error !\n", state->index);
829 } else {
830 /* Fixup temperature according to diode calibration
831 */
832 DBG(" cpu %d, temp raw: %04x, m_diode: %04x, b_diode: %04x\n",
833 state->index,
834 ltemp, state->mpu.mdiode, state->mpu.bdiode);
835 *temp = ((s32)ltemp * (s32)state->mpu.mdiode + ((s32)state->mpu.bdiode << 12)) >> 2;
836 state->last_temp = *temp;
837 DBG(" temp: %d.%03d\n", FIX32TOPRINT((*temp)));
838 }
839
840 /*
841 * Read voltage & current and calculate power
842 */
843 volts = read_smon_adc(state, 3);
844 amps = read_smon_adc(state, 4);
845
846 /* Scale voltage and current raw sensor values according to fixed scales
847 * obtained in Darwin and calculate power from I and V
848 */
849 volts *= ADC_CPU_VOLTAGE_SCALE;
850 amps *= ADC_CPU_CURRENT_SCALE;
851 *power = (((u64)volts) * ((u64)amps)) >> 16;
852 state->voltage = volts;
853 state->current_a = amps;
854 state->last_power = *power;
855
856 DBG(" cpu %d, current: %d.%03d, voltage: %d.%03d, power: %d.%03d W\n",
857 state->index, FIX32TOPRINT(state->current_a),
858 FIX32TOPRINT(state->voltage), FIX32TOPRINT(*power));
859
860 return 0;
861 }
862
863 static void do_cpu_pid(struct cpu_pid_state *state, s32 temp, s32 power)
864 {
865 s32 power_target, integral, derivative, proportional, adj_in_target, sval;
866 s64 integ_p, deriv_p, prop_p, sum;
867 int i;
868
869 /* Calculate power target value (could be done once for all)
870 * and convert to a 16.16 fp number
871 */
872 power_target = ((u32)(state->mpu.pmaxh - state->mpu.padjmax)) << 16;
873 DBG(" power target: %d.%03d, error: %d.%03d\n",
874 FIX32TOPRINT(power_target), FIX32TOPRINT(power_target - power));
875
876 /* Store temperature and power in history array */
877 state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE;
878 state->temp_history[state->cur_temp] = temp;
879 state->cur_power = (state->cur_power + 1) % state->count_power;
880 state->power_history[state->cur_power] = power;
881 state->error_history[state->cur_power] = power_target - power;
882
883 /* If first loop, fill the history table */
884 if (state->first) {
885 for (i = 0; i < (state->count_power - 1); i++) {
886 state->cur_power = (state->cur_power + 1) % state->count_power;
887 state->power_history[state->cur_power] = power;
888 state->error_history[state->cur_power] = power_target - power;
889 }
890 for (i = 0; i < (CPU_TEMP_HISTORY_SIZE - 1); i++) {
891 state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE;
892 state->temp_history[state->cur_temp] = temp;
893 }
894 state->first = 0;
895 }
896
897 /* Calculate the integral term normally based on the "power" values */
898 sum = 0;
899 integral = 0;
900 for (i = 0; i < state->count_power; i++)
901 integral += state->error_history[i];
902 integral *= CPU_PID_INTERVAL;
903 DBG(" integral: %08x\n", integral);
904
905 /* Calculate the adjusted input (sense value).
906 * G_r is 12.20
907 * integ is 16.16
908 * so the result is 28.36
909 *
910 * input target is mpu.ttarget, input max is mpu.tmax
911 */
912 integ_p = ((s64)state->mpu.pid_gr) * (s64)integral;
913 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
914 sval = (state->mpu.tmax << 16) - ((integ_p >> 20) & 0xffffffff);
915 adj_in_target = (state->mpu.ttarget << 16);
916 if (adj_in_target > sval)
917 adj_in_target = sval;
918 DBG(" adj_in_target: %d.%03d, ttarget: %d\n", FIX32TOPRINT(adj_in_target),
919 state->mpu.ttarget);
920
921 /* Calculate the derivative term */
922 derivative = state->temp_history[state->cur_temp] -
923 state->temp_history[(state->cur_temp + CPU_TEMP_HISTORY_SIZE - 1)
924 % CPU_TEMP_HISTORY_SIZE];
925 derivative /= CPU_PID_INTERVAL;
926 deriv_p = ((s64)state->mpu.pid_gd) * (s64)derivative;
927 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
928 sum += deriv_p;
929
930 /* Calculate the proportional term */
931 proportional = temp - adj_in_target;
932 prop_p = ((s64)state->mpu.pid_gp) * (s64)proportional;
933 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
934 sum += prop_p;
935
936 /* Scale sum */
937 sum >>= 36;
938
939 DBG(" sum: %d\n", (int)sum);
940 state->rpm += (s32)sum;
941 }
942
943 static void do_monitor_cpu_combined(void)
944 {
945 struct cpu_pid_state *state0 = &cpu_state[0];
946 struct cpu_pid_state *state1 = &cpu_state[1];
947 s32 temp0, power0, temp1, power1;
948 s32 temp_combi, power_combi;
949 int rc, intake, pump;
950
951 rc = do_read_one_cpu_values(state0, &temp0, &power0);
952 if (rc < 0) {
953 /* XXX What do we do now ? */
954 }
955 state1->overtemp = 0;
956 rc = do_read_one_cpu_values(state1, &temp1, &power1);
957 if (rc < 0) {
958 /* XXX What do we do now ? */
959 }
960 if (state1->overtemp)
961 state0->overtemp++;
962
963 temp_combi = max(temp0, temp1);
964 power_combi = max(power0, power1);
965
966 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
967 * full blown immediately and try to trigger a shutdown
968 */
969 if (temp_combi >= ((state0->mpu.tmax + 8) << 16)) {
970 printk(KERN_WARNING "Warning ! Temperature way above maximum (%d) !\n",
971 temp_combi >> 16);
972 state0->overtemp += CPU_MAX_OVERTEMP / 4;
973 } else if (temp_combi > (state0->mpu.tmax << 16))
974 state0->overtemp++;
975 else
976 state0->overtemp = 0;
977 if (state0->overtemp >= CPU_MAX_OVERTEMP)
978 critical_state = 1;
979 if (state0->overtemp > 0) {
980 state0->rpm = state0->mpu.rmaxn_exhaust_fan;
981 state0->intake_rpm = intake = state0->mpu.rmaxn_intake_fan;
982 pump = state0->pump_max;
983 goto do_set_fans;
984 }
985
986 /* Do the PID */
987 do_cpu_pid(state0, temp_combi, power_combi);
988
989 /* Range check */
990 state0->rpm = max(state0->rpm, (int)state0->mpu.rminn_exhaust_fan);
991 state0->rpm = min(state0->rpm, (int)state0->mpu.rmaxn_exhaust_fan);
992
993 /* Calculate intake fan speed */
994 intake = (state0->rpm * CPU_INTAKE_SCALE) >> 16;
995 intake = max(intake, (int)state0->mpu.rminn_intake_fan);
996 intake = min(intake, (int)state0->mpu.rmaxn_intake_fan);
997 state0->intake_rpm = intake;
998
999 /* Calculate pump speed */
1000 pump = (state0->rpm * state0->pump_max) /
1001 state0->mpu.rmaxn_exhaust_fan;
1002 pump = min(pump, state0->pump_max);
1003 pump = max(pump, state0->pump_min);
1004
1005 do_set_fans:
1006 /* We copy values from state 0 to state 1 for /sysfs */
1007 state1->rpm = state0->rpm;
1008 state1->intake_rpm = state0->intake_rpm;
1009
1010 DBG("** CPU %d RPM: %d Ex, %d, Pump: %d, In, overtemp: %d\n",
1011 state1->index, (int)state1->rpm, intake, pump, state1->overtemp);
1012
1013 /* We should check for errors, shouldn't we ? But then, what
1014 * do we do once the error occurs ? For FCU notified fan
1015 * failures (-EFAULT) we probably want to notify userland
1016 * some way...
1017 */
1018 set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake);
1019 set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state0->rpm);
1020 set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake);
1021 set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state0->rpm);
1022
1023 if (fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID)
1024 set_rpm_fan(CPUA_PUMP_RPM_INDEX, pump);
1025 if (fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID)
1026 set_rpm_fan(CPUB_PUMP_RPM_INDEX, pump);
1027 }
1028
1029 static void do_monitor_cpu_split(struct cpu_pid_state *state)
1030 {
1031 s32 temp, power;
1032 int rc, intake;
1033
1034 /* Read current fan status */
1035 rc = do_read_one_cpu_values(state, &temp, &power);
1036 if (rc < 0) {
1037 /* XXX What do we do now ? */
1038 }
1039
1040 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
1041 * full blown immediately and try to trigger a shutdown
1042 */
1043 if (temp >= ((state->mpu.tmax + 8) << 16)) {
1044 printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum"
1045 " (%d) !\n",
1046 state->index, temp >> 16);
1047 state->overtemp += CPU_MAX_OVERTEMP / 4;
1048 } else if (temp > (state->mpu.tmax << 16))
1049 state->overtemp++;
1050 else
1051 state->overtemp = 0;
1052 if (state->overtemp >= CPU_MAX_OVERTEMP)
1053 critical_state = 1;
1054 if (state->overtemp > 0) {
1055 state->rpm = state->mpu.rmaxn_exhaust_fan;
1056 state->intake_rpm = intake = state->mpu.rmaxn_intake_fan;
1057 goto do_set_fans;
1058 }
1059
1060 /* Do the PID */
1061 do_cpu_pid(state, temp, power);
1062
1063 /* Range check */
1064 state->rpm = max(state->rpm, (int)state->mpu.rminn_exhaust_fan);
1065 state->rpm = min(state->rpm, (int)state->mpu.rmaxn_exhaust_fan);
1066
1067 /* Calculate intake fan */
1068 intake = (state->rpm * CPU_INTAKE_SCALE) >> 16;
1069 intake = max(intake, (int)state->mpu.rminn_intake_fan);
1070 intake = min(intake, (int)state->mpu.rmaxn_intake_fan);
1071 state->intake_rpm = intake;
1072
1073 do_set_fans:
1074 DBG("** CPU %d RPM: %d Ex, %d In, overtemp: %d\n",
1075 state->index, (int)state->rpm, intake, state->overtemp);
1076
1077 /* We should check for errors, shouldn't we ? But then, what
1078 * do we do once the error occurs ? For FCU notified fan
1079 * failures (-EFAULT) we probably want to notify userland
1080 * some way...
1081 */
1082 if (state->index == 0) {
1083 set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake);
1084 set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state->rpm);
1085 } else {
1086 set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake);
1087 set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state->rpm);
1088 }
1089 }
1090
1091 static void do_monitor_cpu_rack(struct cpu_pid_state *state)
1092 {
1093 s32 temp, power, fan_min;
1094 int rc;
1095
1096 /* Read current fan status */
1097 rc = do_read_one_cpu_values(state, &temp, &power);
1098 if (rc < 0) {
1099 /* XXX What do we do now ? */
1100 }
1101
1102 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
1103 * full blown immediately and try to trigger a shutdown
1104 */
1105 if (temp >= ((state->mpu.tmax + 8) << 16)) {
1106 printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum"
1107 " (%d) !\n",
1108 state->index, temp >> 16);
1109 state->overtemp = CPU_MAX_OVERTEMP / 4;
1110 } else if (temp > (state->mpu.tmax << 16))
1111 state->overtemp++;
1112 else
1113 state->overtemp = 0;
1114 if (state->overtemp >= CPU_MAX_OVERTEMP)
1115 critical_state = 1;
1116 if (state->overtemp > 0) {
1117 state->rpm = state->intake_rpm = state->mpu.rmaxn_intake_fan;
1118 goto do_set_fans;
1119 }
1120
1121 /* Do the PID */
1122 do_cpu_pid(state, temp, power);
1123
1124 /* Check clamp from dimms */
1125 fan_min = dimm_output_clamp;
1126 fan_min = max(fan_min, (int)state->mpu.rminn_intake_fan);
1127
1128 DBG(" CPU min mpu = %d, min dimm = %d\n",
1129 state->mpu.rminn_intake_fan, dimm_output_clamp);
1130
1131 state->rpm = max(state->rpm, (int)fan_min);
1132 state->rpm = min(state->rpm, (int)state->mpu.rmaxn_intake_fan);
1133 state->intake_rpm = state->rpm;
1134
1135 do_set_fans:
1136 DBG("** CPU %d RPM: %d overtemp: %d\n",
1137 state->index, (int)state->rpm, state->overtemp);
1138
1139 /* We should check for errors, shouldn't we ? But then, what
1140 * do we do once the error occurs ? For FCU notified fan
1141 * failures (-EFAULT) we probably want to notify userland
1142 * some way...
1143 */
1144 if (state->index == 0) {
1145 set_rpm_fan(CPU_A1_FAN_RPM_INDEX, state->rpm);
1146 set_rpm_fan(CPU_A2_FAN_RPM_INDEX, state->rpm);
1147 set_rpm_fan(CPU_A3_FAN_RPM_INDEX, state->rpm);
1148 } else {
1149 set_rpm_fan(CPU_B1_FAN_RPM_INDEX, state->rpm);
1150 set_rpm_fan(CPU_B2_FAN_RPM_INDEX, state->rpm);
1151 set_rpm_fan(CPU_B3_FAN_RPM_INDEX, state->rpm);
1152 }
1153 }
1154
1155 /*
1156 * Initialize the state structure for one CPU control loop
1157 */
1158 static int init_cpu_state(struct cpu_pid_state *state, int index)
1159 {
1160 state->index = index;
1161 state->first = 1;
1162 state->rpm = (cpu_pid_type == CPU_PID_TYPE_RACKMAC) ? 4000 : 1000;
1163 state->overtemp = 0;
1164 state->adc_config = 0x00;
1165
1166
1167 if (index == 0)
1168 state->monitor = attach_i2c_chip(SUPPLY_MONITOR_ID, "CPU0_monitor");
1169 else if (index == 1)
1170 state->monitor = attach_i2c_chip(SUPPLY_MONITORB_ID, "CPU1_monitor");
1171 if (state->monitor == NULL)
1172 goto fail;
1173
1174 if (read_eeprom(index, &state->mpu))
1175 goto fail;
1176
1177 state->count_power = state->mpu.tguardband;
1178 if (state->count_power > CPU_POWER_HISTORY_SIZE) {
1179 printk(KERN_WARNING "Warning ! too many power history slots\n");
1180 state->count_power = CPU_POWER_HISTORY_SIZE;
1181 }
1182 DBG("CPU %d Using %d power history entries\n", index, state->count_power);
1183
1184 if (index == 0) {
1185 device_create_file(&of_dev->dev, &dev_attr_cpu0_temperature);
1186 device_create_file(&of_dev->dev, &dev_attr_cpu0_voltage);
1187 device_create_file(&of_dev->dev, &dev_attr_cpu0_current);
1188 device_create_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm);
1189 device_create_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm);
1190 } else {
1191 device_create_file(&of_dev->dev, &dev_attr_cpu1_temperature);
1192 device_create_file(&of_dev->dev, &dev_attr_cpu1_voltage);
1193 device_create_file(&of_dev->dev, &dev_attr_cpu1_current);
1194 device_create_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm);
1195 device_create_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm);
1196 }
1197
1198 return 0;
1199 fail:
1200 if (state->monitor)
1201 detach_i2c_chip(state->monitor);
1202 state->monitor = NULL;
1203
1204 return -ENODEV;
1205 }
1206
1207 /*
1208 * Dispose of the state data for one CPU control loop
1209 */
1210 static void dispose_cpu_state(struct cpu_pid_state *state)
1211 {
1212 if (state->monitor == NULL)
1213 return;
1214
1215 if (state->index == 0) {
1216 device_remove_file(&of_dev->dev, &dev_attr_cpu0_temperature);
1217 device_remove_file(&of_dev->dev, &dev_attr_cpu0_voltage);
1218 device_remove_file(&of_dev->dev, &dev_attr_cpu0_current);
1219 device_remove_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm);
1220 device_remove_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm);
1221 } else {
1222 device_remove_file(&of_dev->dev, &dev_attr_cpu1_temperature);
1223 device_remove_file(&of_dev->dev, &dev_attr_cpu1_voltage);
1224 device_remove_file(&of_dev->dev, &dev_attr_cpu1_current);
1225 device_remove_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm);
1226 device_remove_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm);
1227 }
1228
1229 detach_i2c_chip(state->monitor);
1230 state->monitor = NULL;
1231 }
1232
1233 /*
1234 * Motherboard backside & U3 heatsink fan control loop
1235 */
1236 static void do_monitor_backside(struct backside_pid_state *state)
1237 {
1238 s32 temp, integral, derivative, fan_min;
1239 s64 integ_p, deriv_p, prop_p, sum;
1240 int i, rc;
1241
1242 if (--state->ticks != 0)
1243 return;
1244 state->ticks = backside_params.interval;
1245
1246 DBG("backside:\n");
1247
1248 /* Check fan status */
1249 rc = get_pwm_fan(BACKSIDE_FAN_PWM_INDEX);
1250 if (rc < 0) {
1251 printk(KERN_WARNING "Error %d reading backside fan !\n", rc);
1252 /* XXX What do we do now ? */
1253 } else
1254 state->pwm = rc;
1255 DBG(" current pwm: %d\n", state->pwm);
1256
1257 /* Get some sensor readings */
1258 temp = i2c_smbus_read_byte_data(state->monitor, MAX6690_EXT_TEMP) << 16;
1259 state->last_temp = temp;
1260 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1261 FIX32TOPRINT(backside_params.input_target));
1262
1263 /* Store temperature and error in history array */
1264 state->cur_sample = (state->cur_sample + 1) % BACKSIDE_PID_HISTORY_SIZE;
1265 state->sample_history[state->cur_sample] = temp;
1266 state->error_history[state->cur_sample] = temp - backside_params.input_target;
1267
1268 /* If first loop, fill the history table */
1269 if (state->first) {
1270 for (i = 0; i < (BACKSIDE_PID_HISTORY_SIZE - 1); i++) {
1271 state->cur_sample = (state->cur_sample + 1) %
1272 BACKSIDE_PID_HISTORY_SIZE;
1273 state->sample_history[state->cur_sample] = temp;
1274 state->error_history[state->cur_sample] =
1275 temp - backside_params.input_target;
1276 }
1277 state->first = 0;
1278 }
1279
1280 /* Calculate the integral term */
1281 sum = 0;
1282 integral = 0;
1283 for (i = 0; i < BACKSIDE_PID_HISTORY_SIZE; i++)
1284 integral += state->error_history[i];
1285 integral *= backside_params.interval;
1286 DBG(" integral: %08x\n", integral);
1287 integ_p = ((s64)backside_params.G_r) * (s64)integral;
1288 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1289 sum += integ_p;
1290
1291 /* Calculate the derivative term */
1292 derivative = state->error_history[state->cur_sample] -
1293 state->error_history[(state->cur_sample + BACKSIDE_PID_HISTORY_SIZE - 1)
1294 % BACKSIDE_PID_HISTORY_SIZE];
1295 derivative /= backside_params.interval;
1296 deriv_p = ((s64)backside_params.G_d) * (s64)derivative;
1297 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1298 sum += deriv_p;
1299
1300 /* Calculate the proportional term */
1301 prop_p = ((s64)backside_params.G_p) * (s64)(state->error_history[state->cur_sample]);
1302 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1303 sum += prop_p;
1304
1305 /* Scale sum */
1306 sum >>= 36;
1307
1308 DBG(" sum: %d\n", (int)sum);
1309 if (backside_params.additive)
1310 state->pwm += (s32)sum;
1311 else
1312 state->pwm = sum;
1313
1314 /* Check for clamp */
1315 fan_min = (dimm_output_clamp * 100) / 14000;
1316 fan_min = max(fan_min, backside_params.output_min);
1317
1318 state->pwm = max(state->pwm, fan_min);
1319 state->pwm = min(state->pwm, backside_params.output_max);
1320
1321 DBG("** BACKSIDE PWM: %d\n", (int)state->pwm);
1322 set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, state->pwm);
1323 }
1324
1325 /*
1326 * Initialize the state structure for the backside fan control loop
1327 */
1328 static int init_backside_state(struct backside_pid_state *state)
1329 {
1330 struct device_node *u3;
1331 int u3h = 1; /* conservative by default */
1332
1333 /*
1334 * There are different PID params for machines with U3 and machines
1335 * with U3H, pick the right ones now
1336 */
1337 u3 = of_find_node_by_path("/u3@0,f8000000");
1338 if (u3 != NULL) {
1339 const u32 *vers = of_get_property(u3, "device-rev", NULL);
1340 if (vers)
1341 if (((*vers) & 0x3f) < 0x34)
1342 u3h = 0;
1343 of_node_put(u3);
1344 }
1345
1346 if (rackmac) {
1347 backside_params.G_d = BACKSIDE_PID_RACK_G_d;
1348 backside_params.input_target = BACKSIDE_PID_RACK_INPUT_TARGET;
1349 backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN;
1350 backside_params.interval = BACKSIDE_PID_RACK_INTERVAL;
1351 backside_params.G_p = BACKSIDE_PID_RACK_G_p;
1352 backside_params.G_r = BACKSIDE_PID_G_r;
1353 backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX;
1354 backside_params.additive = 0;
1355 } else if (u3h) {
1356 backside_params.G_d = BACKSIDE_PID_U3H_G_d;
1357 backside_params.input_target = BACKSIDE_PID_U3H_INPUT_TARGET;
1358 backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN;
1359 backside_params.interval = BACKSIDE_PID_INTERVAL;
1360 backside_params.G_p = BACKSIDE_PID_G_p;
1361 backside_params.G_r = BACKSIDE_PID_G_r;
1362 backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX;
1363 backside_params.additive = 1;
1364 } else {
1365 backside_params.G_d = BACKSIDE_PID_U3_G_d;
1366 backside_params.input_target = BACKSIDE_PID_U3_INPUT_TARGET;
1367 backside_params.output_min = BACKSIDE_PID_U3_OUTPUT_MIN;
1368 backside_params.interval = BACKSIDE_PID_INTERVAL;
1369 backside_params.G_p = BACKSIDE_PID_G_p;
1370 backside_params.G_r = BACKSIDE_PID_G_r;
1371 backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX;
1372 backside_params.additive = 1;
1373 }
1374
1375 state->ticks = 1;
1376 state->first = 1;
1377 state->pwm = 50;
1378
1379 state->monitor = attach_i2c_chip(BACKSIDE_MAX_ID, "backside_temp");
1380 if (state->monitor == NULL)
1381 return -ENODEV;
1382
1383 device_create_file(&of_dev->dev, &dev_attr_backside_temperature);
1384 device_create_file(&of_dev->dev, &dev_attr_backside_fan_pwm);
1385
1386 return 0;
1387 }
1388
1389 /*
1390 * Dispose of the state data for the backside control loop
1391 */
1392 static void dispose_backside_state(struct backside_pid_state *state)
1393 {
1394 if (state->monitor == NULL)
1395 return;
1396
1397 device_remove_file(&of_dev->dev, &dev_attr_backside_temperature);
1398 device_remove_file(&of_dev->dev, &dev_attr_backside_fan_pwm);
1399
1400 detach_i2c_chip(state->monitor);
1401 state->monitor = NULL;
1402 }
1403
1404 /*
1405 * Drives bay fan control loop
1406 */
1407 static void do_monitor_drives(struct drives_pid_state *state)
1408 {
1409 s32 temp, integral, derivative;
1410 s64 integ_p, deriv_p, prop_p, sum;
1411 int i, rc;
1412
1413 if (--state->ticks != 0)
1414 return;
1415 state->ticks = DRIVES_PID_INTERVAL;
1416
1417 DBG("drives:\n");
1418
1419 /* Check fan status */
1420 rc = get_rpm_fan(DRIVES_FAN_RPM_INDEX, !RPM_PID_USE_ACTUAL_SPEED);
1421 if (rc < 0) {
1422 printk(KERN_WARNING "Error %d reading drives fan !\n", rc);
1423 /* XXX What do we do now ? */
1424 } else
1425 state->rpm = rc;
1426 DBG(" current rpm: %d\n", state->rpm);
1427
1428 /* Get some sensor readings */
1429 temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor,
1430 DS1775_TEMP)) << 8;
1431 state->last_temp = temp;
1432 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1433 FIX32TOPRINT(DRIVES_PID_INPUT_TARGET));
1434
1435 /* Store temperature and error in history array */
1436 state->cur_sample = (state->cur_sample + 1) % DRIVES_PID_HISTORY_SIZE;
1437 state->sample_history[state->cur_sample] = temp;
1438 state->error_history[state->cur_sample] = temp - DRIVES_PID_INPUT_TARGET;
1439
1440 /* If first loop, fill the history table */
1441 if (state->first) {
1442 for (i = 0; i < (DRIVES_PID_HISTORY_SIZE - 1); i++) {
1443 state->cur_sample = (state->cur_sample + 1) %
1444 DRIVES_PID_HISTORY_SIZE;
1445 state->sample_history[state->cur_sample] = temp;
1446 state->error_history[state->cur_sample] =
1447 temp - DRIVES_PID_INPUT_TARGET;
1448 }
1449 state->first = 0;
1450 }
1451
1452 /* Calculate the integral term */
1453 sum = 0;
1454 integral = 0;
1455 for (i = 0; i < DRIVES_PID_HISTORY_SIZE; i++)
1456 integral += state->error_history[i];
1457 integral *= DRIVES_PID_INTERVAL;
1458 DBG(" integral: %08x\n", integral);
1459 integ_p = ((s64)DRIVES_PID_G_r) * (s64)integral;
1460 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1461 sum += integ_p;
1462
1463 /* Calculate the derivative term */
1464 derivative = state->error_history[state->cur_sample] -
1465 state->error_history[(state->cur_sample + DRIVES_PID_HISTORY_SIZE - 1)
1466 % DRIVES_PID_HISTORY_SIZE];
1467 derivative /= DRIVES_PID_INTERVAL;
1468 deriv_p = ((s64)DRIVES_PID_G_d) * (s64)derivative;
1469 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1470 sum += deriv_p;
1471
1472 /* Calculate the proportional term */
1473 prop_p = ((s64)DRIVES_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
1474 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1475 sum += prop_p;
1476
1477 /* Scale sum */
1478 sum >>= 36;
1479
1480 DBG(" sum: %d\n", (int)sum);
1481 state->rpm += (s32)sum;
1482
1483 state->rpm = max(state->rpm, DRIVES_PID_OUTPUT_MIN);
1484 state->rpm = min(state->rpm, DRIVES_PID_OUTPUT_MAX);
1485
1486 DBG("** DRIVES RPM: %d\n", (int)state->rpm);
1487 set_rpm_fan(DRIVES_FAN_RPM_INDEX, state->rpm);
1488 }
1489
1490 /*
1491 * Initialize the state structure for the drives bay fan control loop
1492 */
1493 static int init_drives_state(struct drives_pid_state *state)
1494 {
1495 state->ticks = 1;
1496 state->first = 1;
1497 state->rpm = 1000;
1498
1499 state->monitor = attach_i2c_chip(DRIVES_DALLAS_ID, "drives_temp");
1500 if (state->monitor == NULL)
1501 return -ENODEV;
1502
1503 device_create_file(&of_dev->dev, &dev_attr_drives_temperature);
1504 device_create_file(&of_dev->dev, &dev_attr_drives_fan_rpm);
1505
1506 return 0;
1507 }
1508
1509 /*
1510 * Dispose of the state data for the drives control loop
1511 */
1512 static void dispose_drives_state(struct drives_pid_state *state)
1513 {
1514 if (state->monitor == NULL)
1515 return;
1516
1517 device_remove_file(&of_dev->dev, &dev_attr_drives_temperature);
1518 device_remove_file(&of_dev->dev, &dev_attr_drives_fan_rpm);
1519
1520 detach_i2c_chip(state->monitor);
1521 state->monitor = NULL;
1522 }
1523
1524 /*
1525 * DIMMs temp control loop
1526 */
1527 static void do_monitor_dimms(struct dimm_pid_state *state)
1528 {
1529 s32 temp, integral, derivative, fan_min;
1530 s64 integ_p, deriv_p, prop_p, sum;
1531 int i;
1532
1533 if (--state->ticks != 0)
1534 return;
1535 state->ticks = DIMM_PID_INTERVAL;
1536
1537 DBG("DIMM:\n");
1538
1539 DBG(" current value: %d\n", state->output);
1540
1541 temp = read_lm87_reg(state->monitor, LM87_INT_TEMP);
1542 if (temp < 0)
1543 return;
1544 temp <<= 16;
1545 state->last_temp = temp;
1546 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1547 FIX32TOPRINT(DIMM_PID_INPUT_TARGET));
1548
1549 /* Store temperature and error in history array */
1550 state->cur_sample = (state->cur_sample + 1) % DIMM_PID_HISTORY_SIZE;
1551 state->sample_history[state->cur_sample] = temp;
1552 state->error_history[state->cur_sample] = temp - DIMM_PID_INPUT_TARGET;
1553
1554 /* If first loop, fill the history table */
1555 if (state->first) {
1556 for (i = 0; i < (DIMM_PID_HISTORY_SIZE - 1); i++) {
1557 state->cur_sample = (state->cur_sample + 1) %
1558 DIMM_PID_HISTORY_SIZE;
1559 state->sample_history[state->cur_sample] = temp;
1560 state->error_history[state->cur_sample] =
1561 temp - DIMM_PID_INPUT_TARGET;
1562 }
1563 state->first = 0;
1564 }
1565
1566 /* Calculate the integral term */
1567 sum = 0;
1568 integral = 0;
1569 for (i = 0; i < DIMM_PID_HISTORY_SIZE; i++)
1570 integral += state->error_history[i];
1571 integral *= DIMM_PID_INTERVAL;
1572 DBG(" integral: %08x\n", integral);
1573 integ_p = ((s64)DIMM_PID_G_r) * (s64)integral;
1574 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1575 sum += integ_p;
1576
1577 /* Calculate the derivative term */
1578 derivative = state->error_history[state->cur_sample] -
1579 state->error_history[(state->cur_sample + DIMM_PID_HISTORY_SIZE - 1)
1580 % DIMM_PID_HISTORY_SIZE];
1581 derivative /= DIMM_PID_INTERVAL;
1582 deriv_p = ((s64)DIMM_PID_G_d) * (s64)derivative;
1583 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1584 sum += deriv_p;
1585
1586 /* Calculate the proportional term */
1587 prop_p = ((s64)DIMM_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
1588 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1589 sum += prop_p;
1590
1591 /* Scale sum */
1592 sum >>= 36;
1593
1594 DBG(" sum: %d\n", (int)sum);
1595 state->output = (s32)sum;
1596 state->output = max(state->output, DIMM_PID_OUTPUT_MIN);
1597 state->output = min(state->output, DIMM_PID_OUTPUT_MAX);
1598 dimm_output_clamp = state->output;
1599
1600 DBG("** DIMM clamp value: %d\n", (int)state->output);
1601
1602 /* Backside PID is only every 5 seconds, force backside fan clamping now */
1603 fan_min = (dimm_output_clamp * 100) / 14000;
1604 fan_min = max(fan_min, backside_params.output_min);
1605 if (backside_state.pwm < fan_min) {
1606 backside_state.pwm = fan_min;
1607 DBG(" -> applying clamp to backside fan now: %d !\n", fan_min);
1608 set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, fan_min);
1609 }
1610 }
1611
1612 /*
1613 * Initialize the state structure for the DIMM temp control loop
1614 */
1615 static int init_dimms_state(struct dimm_pid_state *state)
1616 {
1617 state->ticks = 1;
1618 state->first = 1;
1619 state->output = 4000;
1620
1621 state->monitor = attach_i2c_chip(XSERVE_DIMMS_LM87, "dimms_temp");
1622 if (state->monitor == NULL)
1623 return -ENODEV;
1624
1625 device_create_file(&of_dev->dev, &dev_attr_dimms_temperature);
1626
1627 return 0;
1628 }
1629
1630 /*
1631 * Dispose of the state data for the DIMM control loop
1632 */
1633 static void dispose_dimms_state(struct dimm_pid_state *state)
1634 {
1635 if (state->monitor == NULL)
1636 return;
1637
1638 device_remove_file(&of_dev->dev, &dev_attr_dimms_temperature);
1639
1640 detach_i2c_chip(state->monitor);
1641 state->monitor = NULL;
1642 }
1643
1644 /*
1645 * Slots fan control loop
1646 */
1647 static void do_monitor_slots(struct slots_pid_state *state)
1648 {
1649 s32 temp, integral, derivative;
1650 s64 integ_p, deriv_p, prop_p, sum;
1651 int i, rc;
1652
1653 if (--state->ticks != 0)
1654 return;
1655 state->ticks = SLOTS_PID_INTERVAL;
1656
1657 DBG("slots:\n");
1658
1659 /* Check fan status */
1660 rc = get_pwm_fan(SLOTS_FAN_PWM_INDEX);
1661 if (rc < 0) {
1662 printk(KERN_WARNING "Error %d reading slots fan !\n", rc);
1663 /* XXX What do we do now ? */
1664 } else
1665 state->pwm = rc;
1666 DBG(" current pwm: %d\n", state->pwm);
1667
1668 /* Get some sensor readings */
1669 temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor,
1670 DS1775_TEMP)) << 8;
1671 state->last_temp = temp;
1672 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1673 FIX32TOPRINT(SLOTS_PID_INPUT_TARGET));
1674
1675 /* Store temperature and error in history array */
1676 state->cur_sample = (state->cur_sample + 1) % SLOTS_PID_HISTORY_SIZE;
1677 state->sample_history[state->cur_sample] = temp;
1678 state->error_history[state->cur_sample] = temp - SLOTS_PID_INPUT_TARGET;
1679
1680 /* If first loop, fill the history table */
1681 if (state->first) {
1682 for (i = 0; i < (SLOTS_PID_HISTORY_SIZE - 1); i++) {
1683 state->cur_sample = (state->cur_sample + 1) %
1684 SLOTS_PID_HISTORY_SIZE;
1685 state->sample_history[state->cur_sample] = temp;
1686 state->error_history[state->cur_sample] =
1687 temp - SLOTS_PID_INPUT_TARGET;
1688 }
1689 state->first = 0;
1690 }
1691
1692 /* Calculate the integral term */
1693 sum = 0;
1694 integral = 0;
1695 for (i = 0; i < SLOTS_PID_HISTORY_SIZE; i++)
1696 integral += state->error_history[i];
1697 integral *= SLOTS_PID_INTERVAL;
1698 DBG(" integral: %08x\n", integral);
1699 integ_p = ((s64)SLOTS_PID_G_r) * (s64)integral;
1700 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1701 sum += integ_p;
1702
1703 /* Calculate the derivative term */
1704 derivative = state->error_history[state->cur_sample] -
1705 state->error_history[(state->cur_sample + SLOTS_PID_HISTORY_SIZE - 1)
1706 % SLOTS_PID_HISTORY_SIZE];
1707 derivative /= SLOTS_PID_INTERVAL;
1708 deriv_p = ((s64)SLOTS_PID_G_d) * (s64)derivative;
1709 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1710 sum += deriv_p;
1711
1712 /* Calculate the proportional term */
1713 prop_p = ((s64)SLOTS_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
1714 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1715 sum += prop_p;
1716
1717 /* Scale sum */
1718 sum >>= 36;
1719
1720 DBG(" sum: %d\n", (int)sum);
1721 state->pwm = (s32)sum;
1722
1723 state->pwm = max(state->pwm, SLOTS_PID_OUTPUT_MIN);
1724 state->pwm = min(state->pwm, SLOTS_PID_OUTPUT_MAX);
1725
1726 DBG("** DRIVES PWM: %d\n", (int)state->pwm);
1727 set_pwm_fan(SLOTS_FAN_PWM_INDEX, state->pwm);
1728 }
1729
1730 /*
1731 * Initialize the state structure for the slots bay fan control loop
1732 */
1733 static int init_slots_state(struct slots_pid_state *state)
1734 {
1735 state->ticks = 1;
1736 state->first = 1;
1737 state->pwm = 50;
1738
1739 state->monitor = attach_i2c_chip(XSERVE_SLOTS_LM75, "slots_temp");
1740 if (state->monitor == NULL)
1741 return -ENODEV;
1742
1743 device_create_file(&of_dev->dev, &dev_attr_slots_temperature);
1744 device_create_file(&of_dev->dev, &dev_attr_slots_fan_pwm);
1745
1746 return 0;
1747 }
1748
1749 /*
1750 * Dispose of the state data for the slots control loop
1751 */
1752 static void dispose_slots_state(struct slots_pid_state *state)
1753 {
1754 if (state->monitor == NULL)
1755 return;
1756
1757 device_remove_file(&of_dev->dev, &dev_attr_slots_temperature);
1758 device_remove_file(&of_dev->dev, &dev_attr_slots_fan_pwm);
1759
1760 detach_i2c_chip(state->monitor);
1761 state->monitor = NULL;
1762 }
1763
1764
1765 static int call_critical_overtemp(void)
1766 {
1767 char *argv[] = { critical_overtemp_path, NULL };
1768 static char *envp[] = { "HOME=/",
1769 "TERM=linux",
1770 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
1771 NULL };
1772
1773 return call_usermodehelper(critical_overtemp_path,
1774 argv, envp, UMH_WAIT_EXEC);
1775 }
1776
1777
1778 /*
1779 * Here's the kernel thread that calls the various control loops
1780 */
1781 static int main_control_loop(void *x)
1782 {
1783 DBG("main_control_loop started\n");
1784
1785 down(&driver_lock);
1786
1787 if (start_fcu() < 0) {
1788 printk(KERN_ERR "kfand: failed to start FCU\n");
1789 up(&driver_lock);
1790 goto out;
1791 }
1792
1793 /* Set the PCI fan once for now on non-RackMac */
1794 if (!rackmac)
1795 set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM);
1796
1797 /* Initialize ADCs */
1798 initialize_adc(&cpu_state[0]);
1799 if (cpu_state[1].monitor != NULL)
1800 initialize_adc(&cpu_state[1]);
1801
1802 fcu_tickle_ticks = FCU_TICKLE_TICKS;
1803
1804 up(&driver_lock);
1805
1806 while (state == state_attached) {
1807 unsigned long elapsed, start;
1808
1809 start = jiffies;
1810
1811 down(&driver_lock);
1812
1813 /* Tickle the FCU just in case */
1814 if (--fcu_tickle_ticks < 0) {
1815 fcu_tickle_ticks = FCU_TICKLE_TICKS;
1816 tickle_fcu();
1817 }
1818
1819 /* First, we always calculate the new DIMMs state on an Xserve */
1820 if (rackmac)
1821 do_monitor_dimms(&dimms_state);
1822
1823 /* Then, the CPUs */
1824 if (cpu_pid_type == CPU_PID_TYPE_COMBINED)
1825 do_monitor_cpu_combined();
1826 else if (cpu_pid_type == CPU_PID_TYPE_RACKMAC) {
1827 do_monitor_cpu_rack(&cpu_state[0]);
1828 if (cpu_state[1].monitor != NULL)
1829 do_monitor_cpu_rack(&cpu_state[1]);
1830 // better deal with UP
1831 } else {
1832 do_monitor_cpu_split(&cpu_state[0]);
1833 if (cpu_state[1].monitor != NULL)
1834 do_monitor_cpu_split(&cpu_state[1]);
1835 // better deal with UP
1836 }
1837 /* Then, the rest */
1838 do_monitor_backside(&backside_state);
1839 if (rackmac)
1840 do_monitor_slots(&slots_state);
1841 else
1842 do_monitor_drives(&drives_state);
1843 up(&driver_lock);
1844
1845 if (critical_state == 1) {
1846 printk(KERN_WARNING "Temperature control detected a critical condition\n");
1847 printk(KERN_WARNING "Attempting to shut down...\n");
1848 if (call_critical_overtemp()) {
1849 printk(KERN_WARNING "Can't call %s, power off now!\n",
1850 critical_overtemp_path);
1851 machine_power_off();
1852 }
1853 }
1854 if (critical_state > 0)
1855 critical_state++;
1856 if (critical_state > MAX_CRITICAL_STATE) {
1857 printk(KERN_WARNING "Shutdown timed out, power off now !\n");
1858 machine_power_off();
1859 }
1860
1861 // FIXME: Deal with signals
1862 elapsed = jiffies - start;
1863 if (elapsed < HZ)
1864 schedule_timeout_interruptible(HZ - elapsed);
1865 }
1866
1867 out:
1868 DBG("main_control_loop ended\n");
1869
1870 ctrl_task = 0;
1871 complete_and_exit(&ctrl_complete, 0);
1872 }
1873
1874 /*
1875 * Dispose the control loops when tearing down
1876 */
1877 static void dispose_control_loops(void)
1878 {
1879 dispose_cpu_state(&cpu_state[0]);
1880 dispose_cpu_state(&cpu_state[1]);
1881 dispose_backside_state(&backside_state);
1882 dispose_drives_state(&drives_state);
1883 dispose_slots_state(&slots_state);
1884 dispose_dimms_state(&dimms_state);
1885 }
1886
1887 /*
1888 * Create the control loops. U3-0 i2c bus is up, so we can now
1889 * get to the various sensors
1890 */
1891 static int create_control_loops(void)
1892 {
1893 struct device_node *np;
1894
1895 /* Count CPUs from the device-tree, we don't care how many are
1896 * actually used by Linux
1897 */
1898 cpu_count = 0;
1899 for (np = NULL; NULL != (np = of_find_node_by_type(np, "cpu"));)
1900 cpu_count++;
1901
1902 DBG("counted %d CPUs in the device-tree\n", cpu_count);
1903
1904 /* Decide the type of PID algorithm to use based on the presence of
1905 * the pumps, though that may not be the best way, that is good enough
1906 * for now
1907 */
1908 if (rackmac)
1909 cpu_pid_type = CPU_PID_TYPE_RACKMAC;
1910 else if (machine_is_compatible("PowerMac7,3")
1911 && (cpu_count > 1)
1912 && fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID
1913 && fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID) {
1914 printk(KERN_INFO "Liquid cooling pumps detected, using new algorithm !\n");
1915 cpu_pid_type = CPU_PID_TYPE_COMBINED;
1916 } else
1917 cpu_pid_type = CPU_PID_TYPE_SPLIT;
1918
1919 /* Create control loops for everything. If any fail, everything
1920 * fails
1921 */
1922 if (init_cpu_state(&cpu_state[0], 0))
1923 goto fail;
1924 if (cpu_pid_type == CPU_PID_TYPE_COMBINED)
1925 fetch_cpu_pumps_minmax();
1926
1927 if (cpu_count > 1 && init_cpu_state(&cpu_state[1], 1))
1928 goto fail;
1929 if (init_backside_state(&backside_state))
1930 goto fail;
1931 if (rackmac && init_dimms_state(&dimms_state))
1932 goto fail;
1933 if (rackmac && init_slots_state(&slots_state))
1934 goto fail;
1935 if (!rackmac && init_drives_state(&drives_state))
1936 goto fail;
1937
1938 DBG("all control loops up !\n");
1939
1940 return 0;
1941
1942 fail:
1943 DBG("failure creating control loops, disposing\n");
1944
1945 dispose_control_loops();
1946
1947 return -ENODEV;
1948 }
1949
1950 /*
1951 * Start the control loops after everything is up, that is create
1952 * the thread that will make them run
1953 */
1954 static void start_control_loops(void)
1955 {
1956 init_completion(&ctrl_complete);
1957
1958 ctrl_task = kthread_run(main_control_loop, NULL, "kfand");
1959 }
1960
1961 /*
1962 * Stop the control loops when tearing down
1963 */
1964 static void stop_control_loops(void)
1965 {
1966 if (ctrl_task)
1967 wait_for_completion(&ctrl_complete);
1968 }
1969
1970 /*
1971 * Attach to the i2c FCU after detecting U3-1 bus
1972 */
1973 static int attach_fcu(void)
1974 {
1975 fcu = attach_i2c_chip(FAN_CTRLER_ID, "fcu");
1976 if (fcu == NULL)
1977 return -ENODEV;
1978
1979 DBG("FCU attached\n");
1980
1981 return 0;
1982 }
1983
1984 /*
1985 * Detach from the i2c FCU when tearing down
1986 */
1987 static void detach_fcu(void)
1988 {
1989 if (fcu)
1990 detach_i2c_chip(fcu);
1991 fcu = NULL;
1992 }
1993
1994 /*
1995 * Attach to the i2c controller. We probe the various chips based
1996 * on the device-tree nodes and build everything for the driver to
1997 * run, we then kick the driver monitoring thread
1998 */
1999 static int therm_pm72_attach(struct i2c_adapter *adapter)
2000 {
2001 down(&driver_lock);
2002
2003 /* Check state */
2004 if (state == state_detached)
2005 state = state_attaching;
2006 if (state != state_attaching) {
2007 up(&driver_lock);
2008 return 0;
2009 }
2010
2011 /* Check if we are looking for one of these */
2012 if (u3_0 == NULL && !strcmp(adapter->name, "u3 0")) {
2013 u3_0 = adapter;
2014 DBG("found U3-0\n");
2015 if (k2 || !rackmac)
2016 if (create_control_loops())
2017 u3_0 = NULL;
2018 } else if (u3_1 == NULL && !strcmp(adapter->name, "u3 1")) {
2019 u3_1 = adapter;
2020 DBG("found U3-1, attaching FCU\n");
2021 if (attach_fcu())
2022 u3_1 = NULL;
2023 } else if (k2 == NULL && !strcmp(adapter->name, "mac-io 0")) {
2024 k2 = adapter;
2025 DBG("Found K2\n");
2026 if (u3_0 && rackmac)
2027 if (create_control_loops())
2028 k2 = NULL;
2029 }
2030 /* We got all we need, start control loops */
2031 if (u3_0 != NULL && u3_1 != NULL && (k2 || !rackmac)) {
2032 DBG("everything up, starting control loops\n");
2033 state = state_attached;
2034 start_control_loops();
2035 }
2036 up(&driver_lock);
2037
2038 return 0;
2039 }
2040
2041 /*
2042 * Called on every adapter when the driver or the i2c controller
2043 * is going away.
2044 */
2045 static int therm_pm72_detach(struct i2c_adapter *adapter)
2046 {
2047 down(&driver_lock);
2048
2049 if (state != state_detached)
2050 state = state_detaching;
2051
2052 /* Stop control loops if any */
2053 DBG("stopping control loops\n");
2054 up(&driver_lock);
2055 stop_control_loops();
2056 down(&driver_lock);
2057
2058 if (u3_0 != NULL && !strcmp(adapter->name, "u3 0")) {
2059 DBG("lost U3-0, disposing control loops\n");
2060 dispose_control_loops();
2061 u3_0 = NULL;
2062 }
2063
2064 if (u3_1 != NULL && !strcmp(adapter->name, "u3 1")) {
2065 DBG("lost U3-1, detaching FCU\n");
2066 detach_fcu();
2067 u3_1 = NULL;
2068 }
2069 if (u3_0 == NULL && u3_1 == NULL)
2070 state = state_detached;
2071
2072 up(&driver_lock);
2073
2074 return 0;
2075 }
2076
2077 static int fan_check_loc_match(const char *loc, int fan)
2078 {
2079 char tmp[64];
2080 char *c, *e;
2081
2082 strlcpy(tmp, fcu_fans[fan].loc, 64);
2083
2084 c = tmp;
2085 for (;;) {
2086 e = strchr(c, ',');
2087 if (e)
2088 *e = 0;
2089 if (strcmp(loc, c) == 0)
2090 return 1;
2091 if (e == NULL)
2092 break;
2093 c = e + 1;
2094 }
2095 return 0;
2096 }
2097
2098 static void fcu_lookup_fans(struct device_node *fcu_node)
2099 {
2100 struct device_node *np = NULL;
2101 int i;
2102
2103 /* The table is filled by default with values that are suitable
2104 * for the old machines without device-tree informations. We scan
2105 * the device-tree and override those values with whatever is
2106 * there
2107 */
2108
2109 DBG("Looking up FCU controls in device-tree...\n");
2110
2111 while ((np = of_get_next_child(fcu_node, np)) != NULL) {
2112 int type = -1;
2113 const char *loc;
2114 const u32 *reg;
2115
2116 DBG(" control: %s, type: %s\n", np->name, np->type);
2117
2118 /* Detect control type */
2119 if (!strcmp(np->type, "fan-rpm-control") ||
2120 !strcmp(np->type, "fan-rpm"))
2121 type = FCU_FAN_RPM;
2122 if (!strcmp(np->type, "fan-pwm-control") ||
2123 !strcmp(np->type, "fan-pwm"))
2124 type = FCU_FAN_PWM;
2125 /* Only care about fans for now */
2126 if (type == -1)
2127 continue;
2128
2129 /* Lookup for a matching location */
2130 loc = of_get_property(np, "location", NULL);
2131 reg = of_get_property(np, "reg", NULL);
2132 if (loc == NULL || reg == NULL)
2133 continue;
2134 DBG(" matching location: %s, reg: 0x%08x\n", loc, *reg);
2135
2136 for (i = 0; i < FCU_FAN_COUNT; i++) {
2137 int fan_id;
2138
2139 if (!fan_check_loc_match(loc, i))
2140 continue;
2141 DBG(" location match, index: %d\n", i);
2142 fcu_fans[i].id = FCU_FAN_ABSENT_ID;
2143 if (type != fcu_fans[i].type) {
2144 printk(KERN_WARNING "therm_pm72: Fan type mismatch "
2145 "in device-tree for %s\n", np->full_name);
2146 break;
2147 }
2148 if (type == FCU_FAN_RPM)
2149 fan_id = ((*reg) - 0x10) / 2;
2150 else
2151 fan_id = ((*reg) - 0x30) / 2;
2152 if (fan_id > 7) {
2153 printk(KERN_WARNING "therm_pm72: Can't parse "
2154 "fan ID in device-tree for %s\n", np->full_name);
2155 break;
2156 }
2157 DBG(" fan id -> %d, type -> %d\n", fan_id, type);
2158 fcu_fans[i].id = fan_id;
2159 }
2160 }
2161
2162 /* Now dump the array */
2163 printk(KERN_INFO "Detected fan controls:\n");
2164 for (i = 0; i < FCU_FAN_COUNT; i++) {
2165 if (fcu_fans[i].id == FCU_FAN_ABSENT_ID)
2166 continue;
2167 printk(KERN_INFO " %d: %s fan, id %d, location: %s\n", i,
2168 fcu_fans[i].type == FCU_FAN_RPM ? "RPM" : "PWM",
2169 fcu_fans[i].id, fcu_fans[i].loc);
2170 }
2171 }
2172
2173 static int fcu_of_probe(struct of_device* dev, const struct of_device_id *match)
2174 {
2175 state = state_detached;
2176
2177 /* Lookup the fans in the device tree */
2178 fcu_lookup_fans(dev->node);
2179
2180 /* Add the driver */
2181 return i2c_add_driver(&therm_pm72_driver);
2182 }
2183
2184 static int fcu_of_remove(struct of_device* dev)
2185 {
2186 i2c_del_driver(&therm_pm72_driver);
2187
2188 return 0;
2189 }
2190
2191 static struct of_device_id fcu_match[] =
2192 {
2193 {
2194 .type = "fcu",
2195 },
2196 {},
2197 };
2198
2199 static struct of_platform_driver fcu_of_platform_driver =
2200 {
2201 .name = "temperature",
2202 .match_table = fcu_match,
2203 .probe = fcu_of_probe,
2204 .remove = fcu_of_remove
2205 };
2206
2207 /*
2208 * Check machine type, attach to i2c controller
2209 */
2210 static int __init therm_pm72_init(void)
2211 {
2212 struct device_node *np;
2213
2214 rackmac = machine_is_compatible("RackMac3,1");
2215
2216 if (!machine_is_compatible("PowerMac7,2") &&
2217 !machine_is_compatible("PowerMac7,3") &&
2218 !rackmac)
2219 return -ENODEV;
2220
2221 printk(KERN_INFO "PowerMac G5 Thermal control driver %s\n", VERSION);
2222
2223 np = of_find_node_by_type(NULL, "fcu");
2224 if (np == NULL) {
2225 /* Some machines have strangely broken device-tree */
2226 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
2227 if (np == NULL) {
2228 printk(KERN_ERR "Can't find FCU in device-tree !\n");
2229 return -ENODEV;
2230 }
2231 }
2232 of_dev = of_platform_device_create(np, "temperature", NULL);
2233 if (of_dev == NULL) {
2234 printk(KERN_ERR "Can't register FCU platform device !\n");
2235 return -ENODEV;
2236 }
2237
2238 of_register_platform_driver(&fcu_of_platform_driver);
2239
2240 return 0;
2241 }
2242
2243 static void __exit therm_pm72_exit(void)
2244 {
2245 of_unregister_platform_driver(&fcu_of_platform_driver);
2246
2247 if (of_dev)
2248 of_device_unregister(of_dev);
2249 }
2250
2251 module_init(therm_pm72_init);
2252 module_exit(therm_pm72_exit);
2253
2254 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
2255 MODULE_DESCRIPTION("Driver for Apple's PowerMac G5 thermal control");
2256 MODULE_LICENSE("GPL");
2257
kmemtrace - Kernel memory tracer