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 */
99
100 #include <linux/config.h>
101 #include <linux/types.h>
102 #include <linux/module.h>
103 #include <linux/errno.h>
104 #include <linux/kernel.h>
105 #include <linux/delay.h>
106 #include <linux/sched.h>
107 #include <linux/slab.h>
108 #include <linux/init.h>
109 #include <linux/spinlock.h>
110 #include <linux/smp_lock.h>
111 #include <linux/wait.h>
112 #include <linux/reboot.h>
113 #include <linux/kmod.h>
114 #include <linux/i2c.h>
115 #include <asm/prom.h>
116 #include <asm/machdep.h>
117 #include <asm/io.h>
118 #include <asm/system.h>
119 #include <asm/sections.h>
120 #include <asm/of_device.h>
121 #include <asm/macio.h>
122
123 #include "therm_pm72.h"
124
125 #define VERSION "1.2b2"
126
127 #undef DEBUG
128
129 #ifdef DEBUG
130 #define DBG(args...) printk(args)
131 #else
132 #define DBG(args...) do { } while(0)
133 #endif
134
135
136 /*
137 * Driver statics
138 */
139
140 static struct of_device * of_dev;
141 static struct i2c_adapter * u3_0;
142 static struct i2c_adapter * u3_1;
143 static struct i2c_adapter * k2;
144 static struct i2c_client * fcu;
145 static struct cpu_pid_state cpu_state[2];
146 static struct basckside_pid_params backside_params;
147 static struct backside_pid_state backside_state;
148 static struct drives_pid_state drives_state;
149 static struct dimm_pid_state dimms_state;
150 static int state;
151 static int cpu_count;
152 static int cpu_pid_type;
153 static pid_t ctrl_task;
154 static struct completion ctrl_complete;
155 static int critical_state;
156 static int rackmac;
157 static s32 dimm_output_clamp;
158
159 static DECLARE_MUTEX(driver_lock);
160
161 /*
162 * We have 3 types of CPU PID control. One is "split" old style control
163 * for intake & exhaust fans, the other is "combined" control for both
164 * CPUs that also deals with the pumps when present. To be "compatible"
165 * with OS X at this point, we only use "COMBINED" on the machines that
166 * are identified as having the pumps (though that identification is at
167 * least dodgy). Ultimately, we could probably switch completely to this
168 * algorithm provided we hack it to deal with the UP case
169 */
170 #define CPU_PID_TYPE_SPLIT 0
171 #define CPU_PID_TYPE_COMBINED 1
172 #define CPU_PID_TYPE_RACKMAC 2
173
174 /*
175 * This table describes all fans in the FCU. The "id" and "type" values
176 * are defaults valid for all earlier machines. Newer machines will
177 * eventually override the table content based on the device-tree
178 */
179 struct fcu_fan_table
180 {
181 char* loc; /* location code */
182 int type; /* 0 = rpm, 1 = pwm, 2 = pump */
183 int id; /* id or -1 */
184 };
185
186 #define FCU_FAN_RPM 0
187 #define FCU_FAN_PWM 1
188
189 #define FCU_FAN_ABSENT_ID -1
190
191 #define FCU_FAN_COUNT ARRAY_SIZE(fcu_fans)
192
193 struct fcu_fan_table fcu_fans[] = {
194 [BACKSIDE_FAN_PWM_INDEX] = {
195 .loc = "BACKSIDE,SYS CTRLR FAN",
196 .type = FCU_FAN_PWM,
197 .id = BACKSIDE_FAN_PWM_DEFAULT_ID,
198 },
199 [DRIVES_FAN_RPM_INDEX] = {
200 .loc = "DRIVE BAY",
201 .type = FCU_FAN_RPM,
202 .id = DRIVES_FAN_RPM_DEFAULT_ID,
203 },
204 [SLOTS_FAN_PWM_INDEX] = {
205 .loc = "SLOT,PCI FAN",
206 .type = FCU_FAN_PWM,
207 .id = SLOTS_FAN_PWM_DEFAULT_ID,
208 },
209 [CPUA_INTAKE_FAN_RPM_INDEX] = {
210 .loc = "CPU A INTAKE",
211 .type = FCU_FAN_RPM,
212 .id = CPUA_INTAKE_FAN_RPM_DEFAULT_ID,
213 },
214 [CPUA_EXHAUST_FAN_RPM_INDEX] = {
215 .loc = "CPU A EXHAUST",
216 .type = FCU_FAN_RPM,
217 .id = CPUA_EXHAUST_FAN_RPM_DEFAULT_ID,
218 },
219 [CPUB_INTAKE_FAN_RPM_INDEX] = {
220 .loc = "CPU B INTAKE",
221 .type = FCU_FAN_RPM,
222 .id = CPUB_INTAKE_FAN_RPM_DEFAULT_ID,
223 },
224 [CPUB_EXHAUST_FAN_RPM_INDEX] = {
225 .loc = "CPU B EXHAUST",
226 .type = FCU_FAN_RPM,
227 .id = CPUB_EXHAUST_FAN_RPM_DEFAULT_ID,
228 },
229 /* pumps aren't present by default, have to be looked up in the
230 * device-tree
231 */
232 [CPUA_PUMP_RPM_INDEX] = {
233 .loc = "CPU A PUMP",
234 .type = FCU_FAN_RPM,
235 .id = FCU_FAN_ABSENT_ID,
236 },
237 [CPUB_PUMP_RPM_INDEX] = {
238 .loc = "CPU B PUMP",
239 .type = FCU_FAN_RPM,
240 .id = FCU_FAN_ABSENT_ID,
241 },
242 /* Xserve fans */
243 [CPU_A1_FAN_RPM_INDEX] = {
244 .loc = "CPU A 1",
245 .type = FCU_FAN_RPM,
246 .id = FCU_FAN_ABSENT_ID,
247 },
248 [CPU_A2_FAN_RPM_INDEX] = {
249 .loc = "CPU A 2",
250 .type = FCU_FAN_RPM,
251 .id = FCU_FAN_ABSENT_ID,
252 },
253 [CPU_A3_FAN_RPM_INDEX] = {
254 .loc = "CPU A 3",
255 .type = FCU_FAN_RPM,
256 .id = FCU_FAN_ABSENT_ID,
257 },
258 [CPU_B1_FAN_RPM_INDEX] = {
259 .loc = "CPU B 1",
260 .type = FCU_FAN_RPM,
261 .id = FCU_FAN_ABSENT_ID,
262 },
263 [CPU_B2_FAN_RPM_INDEX] = {
264 .loc = "CPU B 2",
265 .type = FCU_FAN_RPM,
266 .id = FCU_FAN_ABSENT_ID,
267 },
268 [CPU_B3_FAN_RPM_INDEX] = {
269 .loc = "CPU B 3",
270 .type = FCU_FAN_RPM,
271 .id = FCU_FAN_ABSENT_ID,
272 },
273 };
274
275 /*
276 * i2c_driver structure to attach to the host i2c controller
277 */
278
279 static int therm_pm72_attach(struct i2c_adapter *adapter);
280 static int therm_pm72_detach(struct i2c_adapter *adapter);
281
282 static struct i2c_driver therm_pm72_driver =
283 {
284 .driver = {
285 .name = "therm_pm72",
286 },
287 .attach_adapter = therm_pm72_attach,
288 .detach_adapter = therm_pm72_detach,
289 };
290
291 /*
292 * Utility function to create an i2c_client structure and
293 * attach it to one of u3 adapters
294 */
295 static struct i2c_client *attach_i2c_chip(int id, const char *name)
296 {
297 struct i2c_client *clt;
298 struct i2c_adapter *adap;
299
300 if (id & 0x200)
301 adap = k2;
302 else if (id & 0x100)
303 adap = u3_1;
304 else
305 adap = u3_0;
306 if (adap == NULL)
307 return NULL;
308
309 clt = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
310 if (clt == NULL)
311 return NULL;
312 memset(clt, 0, sizeof(struct i2c_client));
313
314 clt->addr = (id >> 1) & 0x7f;
315 clt->adapter = adap;
316 clt->driver = &therm_pm72_driver;
317 strncpy(clt->name, name, I2C_NAME_SIZE-1);
318
319 if (i2c_attach_client(clt)) {
320 printk(KERN_ERR "therm_pm72: Failed to attach to i2c ID 0x%x\n", id);
321 kfree(clt);
322 return NULL;
323 }
324 return clt;
325 }
326
327 /*
328 * Utility function to get rid of the i2c_client structure
329 * (will also detach from the adapter hopepfully)
330 */
331 static void detach_i2c_chip(struct i2c_client *clt)
332 {
333 i2c_detach_client(clt);
334 kfree(clt);
335 }
336
337 /*
338 * Here are the i2c chip access wrappers
339 */
340
341 static void initialize_adc(struct cpu_pid_state *state)
342 {
343 int rc;
344 u8 buf[2];
345
346 /* Read ADC the configuration register and cache it. We
347 * also make sure Config2 contains proper values, I've seen
348 * cases where we got stale grabage in there, thus preventing
349 * proper reading of conv. values
350 */
351
352 /* Clear Config2 */
353 buf[0] = 5;
354 buf[1] = 0;
355 i2c_master_send(state->monitor, buf, 2);
356
357 /* Read & cache Config1 */
358 buf[0] = 1;
359 rc = i2c_master_send(state->monitor, buf, 1);
360 if (rc > 0) {
361 rc = i2c_master_recv(state->monitor, buf, 1);
362 if (rc > 0) {
363 state->adc_config = buf[0];
364 DBG("ADC config reg: %02x\n", state->adc_config);
365 /* Disable shutdown mode */
366 state->adc_config &= 0xfe;
367 buf[0] = 1;
368 buf[1] = state->adc_config;
369 rc = i2c_master_send(state->monitor, buf, 2);
370 }
371 }
372 if (rc <= 0)
373 printk(KERN_ERR "therm_pm72: Error reading ADC config"
374 " register !\n");
375 }
376
377 static int read_smon_adc(struct cpu_pid_state *state, int chan)
378 {
379 int rc, data, tries = 0;
380 u8 buf[2];
381
382 for (;;) {
383 /* Set channel */
384 buf[0] = 1;
385 buf[1] = (state->adc_config & 0x1f) | (chan << 5);
386 rc = i2c_master_send(state->monitor, buf, 2);
387 if (rc <= 0)
388 goto error;
389 /* Wait for convertion */
390 msleep(1);
391 /* Switch to data register */
392 buf[0] = 4;
393 rc = i2c_master_send(state->monitor, buf, 1);
394 if (rc <= 0)
395 goto error;
396 /* Read result */
397 rc = i2c_master_recv(state->monitor, buf, 2);
398 if (rc < 0)
399 goto error;
400 data = ((u16)buf[0]) << 8 | (u16)buf[1];
401 return data >> 6;
402 error:
403 DBG("Error reading ADC, retrying...\n");
404 if (++tries > 10) {
405 printk(KERN_ERR "therm_pm72: Error reading ADC !\n");
406 return -1;
407 }
408 msleep(10);
409 }
410 }
411
412 static int read_lm87_reg(struct i2c_client * chip, int reg)
413 {
414 int rc, tries = 0;
415 u8 buf;
416
417 for (;;) {
418 /* Set address */
419 buf = (u8)reg;
420 rc = i2c_master_send(chip, &buf, 1);
421 if (rc <= 0)
422 goto error;
423 rc = i2c_master_recv(chip, &buf, 1);
424 if (rc <= 0)
425 goto error;
426 return (int)buf;
427 error:
428 DBG("Error reading LM87, retrying...\n");
429 if (++tries > 10) {
430 printk(KERN_ERR "therm_pm72: Error reading LM87 !\n");
431 return -1;
432 }
433 msleep(10);
434 }
435 }
436
437 static int fan_read_reg(int reg, unsigned char *buf, int nb)
438 {
439 int tries, nr, nw;
440
441 buf[0] = reg;
442 tries = 0;
443 for (;;) {
444 nw = i2c_master_send(fcu, buf, 1);
445 if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100)
446 break;
447 msleep(10);
448 ++tries;
449 }
450 if (nw <= 0) {
451 printk(KERN_ERR "Failure writing address to FCU: %d", nw);
452 return -EIO;
453 }
454 tries = 0;
455 for (;;) {
456 nr = i2c_master_recv(fcu, buf, nb);
457 if (nr > 0 || (nr < 0 && nr != ENODEV) || tries >= 100)
458 break;
459 msleep(10);
460 ++tries;
461 }
462 if (nr <= 0)
463 printk(KERN_ERR "Failure reading data from FCU: %d", nw);
464 return nr;
465 }
466
467 static int fan_write_reg(int reg, const unsigned char *ptr, int nb)
468 {
469 int tries, nw;
470 unsigned char buf[16];
471
472 buf[0] = reg;
473 memcpy(buf+1, ptr, nb);
474 ++nb;
475 tries = 0;
476 for (;;) {
477 nw = i2c_master_send(fcu, buf, nb);
478 if (nw > 0 || (nw < 0 && nw != EIO) || tries >= 100)
479 break;
480 msleep(10);
481 ++tries;
482 }
483 if (nw < 0)
484 printk(KERN_ERR "Failure writing to FCU: %d", nw);
485 return nw;
486 }
487
488 static int start_fcu(void)
489 {
490 unsigned char buf = 0xff;
491 int rc;
492
493 rc = fan_write_reg(0xe, &buf, 1);
494 if (rc < 0)
495 return -EIO;
496 rc = fan_write_reg(0x2e, &buf, 1);
497 if (rc < 0)
498 return -EIO;
499 return 0;
500 }
501
502 static int set_rpm_fan(int fan_index, int rpm)
503 {
504 unsigned char buf[2];
505 int rc, id;
506
507 if (fcu_fans[fan_index].type != FCU_FAN_RPM)
508 return -EINVAL;
509 id = fcu_fans[fan_index].id;
510 if (id == FCU_FAN_ABSENT_ID)
511 return -EINVAL;
512
513 if (rpm < 300)
514 rpm = 300;
515 else if (rpm > 8191)
516 rpm = 8191;
517 buf[0] = rpm >> 5;
518 buf[1] = rpm << 3;
519 rc = fan_write_reg(0x10 + (id * 2), buf, 2);
520 if (rc < 0)
521 return -EIO;
522 return 0;
523 }
524
525 static int get_rpm_fan(int fan_index, int programmed)
526 {
527 unsigned char failure;
528 unsigned char active;
529 unsigned char buf[2];
530 int rc, id, reg_base;
531
532 if (fcu_fans[fan_index].type != FCU_FAN_RPM)
533 return -EINVAL;
534 id = fcu_fans[fan_index].id;
535 if (id == FCU_FAN_ABSENT_ID)
536 return -EINVAL;
537
538 rc = fan_read_reg(0xb, &failure, 1);
539 if (rc != 1)
540 return -EIO;
541 if ((failure & (1 << id)) != 0)
542 return -EFAULT;
543 rc = fan_read_reg(0xd, &active, 1);
544 if (rc != 1)
545 return -EIO;
546 if ((active & (1 << id)) == 0)
547 return -ENXIO;
548
549 /* Programmed value or real current speed */
550 reg_base = programmed ? 0x10 : 0x11;
551 rc = fan_read_reg(reg_base + (id * 2), buf, 2);
552 if (rc != 2)
553 return -EIO;
554
555 return (buf[0] << 5) | buf[1] >> 3;
556 }
557
558 static int set_pwm_fan(int fan_index, int pwm)
559 {
560 unsigned char buf[2];
561 int rc, id;
562
563 if (fcu_fans[fan_index].type != FCU_FAN_PWM)
564 return -EINVAL;
565 id = fcu_fans[fan_index].id;
566 if (id == FCU_FAN_ABSENT_ID)
567 return -EINVAL;
568
569 if (pwm < 10)
570 pwm = 10;
571 else if (pwm > 100)
572 pwm = 100;
573 pwm = (pwm * 2559) / 1000;
574 buf[0] = pwm;
575 rc = fan_write_reg(0x30 + (id * 2), buf, 1);
576 if (rc < 0)
577 return rc;
578 return 0;
579 }
580
581 static int get_pwm_fan(int fan_index)
582 {
583 unsigned char failure;
584 unsigned char active;
585 unsigned char buf[2];
586 int rc, id;
587
588 if (fcu_fans[fan_index].type != FCU_FAN_PWM)
589 return -EINVAL;
590 id = fcu_fans[fan_index].id;
591 if (id == FCU_FAN_ABSENT_ID)
592 return -EINVAL;
593
594 rc = fan_read_reg(0x2b, &failure, 1);
595 if (rc != 1)
596 return -EIO;
597 if ((failure & (1 << id)) != 0)
598 return -EFAULT;
599 rc = fan_read_reg(0x2d, &active, 1);
600 if (rc != 1)
601 return -EIO;
602 if ((active & (1 << id)) == 0)
603 return -ENXIO;
604
605 /* Programmed value or real current speed */
606 rc = fan_read_reg(0x30 + (id * 2), buf, 1);
607 if (rc != 1)
608 return -EIO;
609
610 return (buf[0] * 1000) / 2559;
611 }
612
613 /*
614 * Utility routine to read the CPU calibration EEPROM data
615 * from the device-tree
616 */
617 static int read_eeprom(int cpu, struct mpu_data *out)
618 {
619 struct device_node *np;
620 char nodename[64];
621 u8 *data;
622 int len;
623
624 /* prom.c routine for finding a node by path is a bit brain dead
625 * and requires exact @xxx unit numbers. This is a bit ugly but
626 * will work for these machines
627 */
628 sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0);
629 np = of_find_node_by_path(nodename);
630 if (np == NULL) {
631 printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid node from device-tree\n");
632 return -ENODEV;
633 }
634 data = (u8 *)get_property(np, "cpuid", &len);
635 if (data == NULL) {
636 printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid property from device-tree\n");
637 of_node_put(np);
638 return -ENODEV;
639 }
640 memcpy(out, data, sizeof(struct mpu_data));
641 of_node_put(np);
642
643 return 0;
644 }
645
646 static void fetch_cpu_pumps_minmax(void)
647 {
648 struct cpu_pid_state *state0 = &cpu_state[0];
649 struct cpu_pid_state *state1 = &cpu_state[1];
650 u16 pump_min = 0, pump_max = 0xffff;
651 u16 tmp[4];
652
653 /* Try to fetch pumps min/max infos from eeprom */
654
655 memcpy(&tmp, &state0->mpu.processor_part_num, 8);
656 if (tmp[0] != 0xffff && tmp[1] != 0xffff) {
657 pump_min = max(pump_min, tmp[0]);
658 pump_max = min(pump_max, tmp[1]);
659 }
660 if (tmp[2] != 0xffff && tmp[3] != 0xffff) {
661 pump_min = max(pump_min, tmp[2]);
662 pump_max = min(pump_max, tmp[3]);
663 }
664
665 /* Double check the values, this _IS_ needed as the EEPROM on
666 * some dual 2.5Ghz G5s seem, at least, to have both min & max
667 * same to the same value ... (grrrr)
668 */
669 if (pump_min == pump_max || pump_min == 0 || pump_max == 0xffff) {
670 pump_min = CPU_PUMP_OUTPUT_MIN;
671 pump_max = CPU_PUMP_OUTPUT_MAX;
672 }
673
674 state0->pump_min = state1->pump_min = pump_min;
675 state0->pump_max = state1->pump_max = pump_max;
676 }
677
678 /*
679 * Now, unfortunately, sysfs doesn't give us a nice void * we could
680 * pass around to the attribute functions, so we don't really have
681 * choice but implement a bunch of them...
682 *
683 * That sucks a bit, we take the lock because FIX32TOPRINT evaluates
684 * the input twice... I accept patches :)
685 */
686 #define BUILD_SHOW_FUNC_FIX(name, data) \
687 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
688 { \
689 ssize_t r; \
690 down(&driver_lock); \
691 r = sprintf(buf, "%d.%03d", FIX32TOPRINT(data)); \
692 up(&driver_lock); \
693 return r; \
694 }
695 #define BUILD_SHOW_FUNC_INT(name, data) \
696 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
697 { \
698 return sprintf(buf, "%d", data); \
699 }
700
701 BUILD_SHOW_FUNC_FIX(cpu0_temperature, cpu_state[0].last_temp)
702 BUILD_SHOW_FUNC_FIX(cpu0_voltage, cpu_state[0].voltage)
703 BUILD_SHOW_FUNC_FIX(cpu0_current, cpu_state[0].current_a)
704 BUILD_SHOW_FUNC_INT(cpu0_exhaust_fan_rpm, cpu_state[0].rpm)
705 BUILD_SHOW_FUNC_INT(cpu0_intake_fan_rpm, cpu_state[0].intake_rpm)
706
707 BUILD_SHOW_FUNC_FIX(cpu1_temperature, cpu_state[1].last_temp)
708 BUILD_SHOW_FUNC_FIX(cpu1_voltage, cpu_state[1].voltage)
709 BUILD_SHOW_FUNC_FIX(cpu1_current, cpu_state[1].current_a)
710 BUILD_SHOW_FUNC_INT(cpu1_exhaust_fan_rpm, cpu_state[1].rpm)
711 BUILD_SHOW_FUNC_INT(cpu1_intake_fan_rpm, cpu_state[1].intake_rpm)
712
713 BUILD_SHOW_FUNC_FIX(backside_temperature, backside_state.last_temp)
714 BUILD_SHOW_FUNC_INT(backside_fan_pwm, backside_state.pwm)
715
716 BUILD_SHOW_FUNC_FIX(drives_temperature, drives_state.last_temp)
717 BUILD_SHOW_FUNC_INT(drives_fan_rpm, drives_state.rpm)
718
719 BUILD_SHOW_FUNC_FIX(dimms_temperature, dimms_state.last_temp)
720
721 static DEVICE_ATTR(cpu0_temperature,S_IRUGO,show_cpu0_temperature,NULL);
722 static DEVICE_ATTR(cpu0_voltage,S_IRUGO,show_cpu0_voltage,NULL);
723 static DEVICE_ATTR(cpu0_current,S_IRUGO,show_cpu0_current,NULL);
724 static DEVICE_ATTR(cpu0_exhaust_fan_rpm,S_IRUGO,show_cpu0_exhaust_fan_rpm,NULL);
725 static DEVICE_ATTR(cpu0_intake_fan_rpm,S_IRUGO,show_cpu0_intake_fan_rpm,NULL);
726
727 static DEVICE_ATTR(cpu1_temperature,S_IRUGO,show_cpu1_temperature,NULL);
728 static DEVICE_ATTR(cpu1_voltage,S_IRUGO,show_cpu1_voltage,NULL);
729 static DEVICE_ATTR(cpu1_current,S_IRUGO,show_cpu1_current,NULL);
730 static DEVICE_ATTR(cpu1_exhaust_fan_rpm,S_IRUGO,show_cpu1_exhaust_fan_rpm,NULL);
731 static DEVICE_ATTR(cpu1_intake_fan_rpm,S_IRUGO,show_cpu1_intake_fan_rpm,NULL);
732
733 static DEVICE_ATTR(backside_temperature,S_IRUGO,show_backside_temperature,NULL);
734 static DEVICE_ATTR(backside_fan_pwm,S_IRUGO,show_backside_fan_pwm,NULL);
735
736 static DEVICE_ATTR(drives_temperature,S_IRUGO,show_drives_temperature,NULL);
737 static DEVICE_ATTR(drives_fan_rpm,S_IRUGO,show_drives_fan_rpm,NULL);
738
739 static DEVICE_ATTR(dimms_temperature,S_IRUGO,show_dimms_temperature,NULL);
740
741 /*
742 * CPUs fans control loop
743 */
744
745 static int do_read_one_cpu_values(struct cpu_pid_state *state, s32 *temp, s32 *power)
746 {
747 s32 ltemp, volts, amps;
748 int index, rc = 0;
749
750 /* Default (in case of error) */
751 *temp = state->cur_temp;
752 *power = state->cur_power;
753
754 if (cpu_pid_type == CPU_PID_TYPE_RACKMAC)
755 index = (state->index == 0) ?
756 CPU_A1_FAN_RPM_INDEX : CPU_B1_FAN_RPM_INDEX;
757 else
758 index = (state->index == 0) ?
759 CPUA_EXHAUST_FAN_RPM_INDEX : CPUB_EXHAUST_FAN_RPM_INDEX;
760
761 /* Read current fan status */
762 rc = get_rpm_fan(index, !RPM_PID_USE_ACTUAL_SPEED);
763 if (rc < 0) {
764 /* XXX What do we do now ? Nothing for now, keep old value, but
765 * return error upstream
766 */
767 DBG(" cpu %d, fan reading error !\n", state->index);
768 } else {
769 state->rpm = rc;
770 DBG(" cpu %d, exhaust RPM: %d\n", state->index, state->rpm);
771 }
772
773 /* Get some sensor readings and scale it */
774 ltemp = read_smon_adc(state, 1);
775 if (ltemp == -1) {
776 /* XXX What do we do now ? */
777 state->overtemp++;
778 if (rc == 0)
779 rc = -EIO;
780 DBG(" cpu %d, temp reading error !\n", state->index);
781 } else {
782 /* Fixup temperature according to diode calibration
783 */
784 DBG(" cpu %d, temp raw: %04x, m_diode: %04x, b_diode: %04x\n",
785 state->index,
786 ltemp, state->mpu.mdiode, state->mpu.bdiode);
787 *temp = ((s32)ltemp * (s32)state->mpu.mdiode + ((s32)state->mpu.bdiode << 12)) >> 2;
788 state->last_temp = *temp;
789 DBG(" temp: %d.%03d\n", FIX32TOPRINT((*temp)));
790 }
791
792 /*
793 * Read voltage & current and calculate power
794 */
795 volts = read_smon_adc(state, 3);
796 amps = read_smon_adc(state, 4);
797
798 /* Scale voltage and current raw sensor values according to fixed scales
799 * obtained in Darwin and calculate power from I and V
800 */
801 volts *= ADC_CPU_VOLTAGE_SCALE;
802 amps *= ADC_CPU_CURRENT_SCALE;
803 *power = (((u64)volts) * ((u64)amps)) >> 16;
804 state->voltage = volts;
805 state->current_a = amps;
806 state->last_power = *power;
807
808 DBG(" cpu %d, current: %d.%03d, voltage: %d.%03d, power: %d.%03d W\n",
809 state->index, FIX32TOPRINT(state->current_a),
810 FIX32TOPRINT(state->voltage), FIX32TOPRINT(*power));
811
812 return 0;
813 }
814
815 static void do_cpu_pid(struct cpu_pid_state *state, s32 temp, s32 power)
816 {
817 s32 power_target, integral, derivative, proportional, adj_in_target, sval;
818 s64 integ_p, deriv_p, prop_p, sum;
819 int i;
820
821 /* Calculate power target value (could be done once for all)
822 * and convert to a 16.16 fp number
823 */
824 power_target = ((u32)(state->mpu.pmaxh - state->mpu.padjmax)) << 16;
825 DBG(" power target: %d.%03d, error: %d.%03d\n",
826 FIX32TOPRINT(power_target), FIX32TOPRINT(power_target - power));
827
828 /* Store temperature and power in history array */
829 state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE;
830 state->temp_history[state->cur_temp] = temp;
831 state->cur_power = (state->cur_power + 1) % state->count_power;
832 state->power_history[state->cur_power] = power;
833 state->error_history[state->cur_power] = power_target - power;
834
835 /* If first loop, fill the history table */
836 if (state->first) {
837 for (i = 0; i < (state->count_power - 1); i++) {
838 state->cur_power = (state->cur_power + 1) % state->count_power;
839 state->power_history[state->cur_power] = power;
840 state->error_history[state->cur_power] = power_target - power;
841 }
842 for (i = 0; i < (CPU_TEMP_HISTORY_SIZE - 1); i++) {
843 state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE;
844 state->temp_history[state->cur_temp] = temp;
845 }
846 state->first = 0;
847 }
848
849 /* Calculate the integral term normally based on the "power" values */
850 sum = 0;
851 integral = 0;
852 for (i = 0; i < state->count_power; i++)
853 integral += state->error_history[i];
854 integral *= CPU_PID_INTERVAL;
855 DBG(" integral: %08x\n", integral);
856
857 /* Calculate the adjusted input (sense value).
858 * G_r is 12.20
859 * integ is 16.16
860 * so the result is 28.36
861 *
862 * input target is mpu.ttarget, input max is mpu.tmax
863 */
864 integ_p = ((s64)state->mpu.pid_gr) * (s64)integral;
865 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
866 sval = (state->mpu.tmax << 16) - ((integ_p >> 20) & 0xffffffff);
867 adj_in_target = (state->mpu.ttarget << 16);
868 if (adj_in_target > sval)
869 adj_in_target = sval;
870 DBG(" adj_in_target: %d.%03d, ttarget: %d\n", FIX32TOPRINT(adj_in_target),
871 state->mpu.ttarget);
872
873 /* Calculate the derivative term */
874 derivative = state->temp_history[state->cur_temp] -
875 state->temp_history[(state->cur_temp + CPU_TEMP_HISTORY_SIZE - 1)
876 % CPU_TEMP_HISTORY_SIZE];
877 derivative /= CPU_PID_INTERVAL;
878 deriv_p = ((s64)state->mpu.pid_gd) * (s64)derivative;
879 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
880 sum += deriv_p;
881
882 /* Calculate the proportional term */
883 proportional = temp - adj_in_target;
884 prop_p = ((s64)state->mpu.pid_gp) * (s64)proportional;
885 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
886 sum += prop_p;
887
888 /* Scale sum */
889 sum >>= 36;
890
891 DBG(" sum: %d\n", (int)sum);
892 state->rpm += (s32)sum;
893 }
894
895 static void do_monitor_cpu_combined(void)
896 {
897 struct cpu_pid_state *state0 = &cpu_state[0];
898 struct cpu_pid_state *state1 = &cpu_state[1];
899 s32 temp0, power0, temp1, power1;
900 s32 temp_combi, power_combi;
901 int rc, intake, pump;
902
903 rc = do_read_one_cpu_values(state0, &temp0, &power0);
904 if (rc < 0) {
905 /* XXX What do we do now ? */
906 }
907 state1->overtemp = 0;
908 rc = do_read_one_cpu_values(state1, &temp1, &power1);
909 if (rc < 0) {
910 /* XXX What do we do now ? */
911 }
912 if (state1->overtemp)
913 state0->overtemp++;
914
915 temp_combi = max(temp0, temp1);
916 power_combi = max(power0, power1);
917
918 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
919 * full blown immediately and try to trigger a shutdown
920 */
921 if (temp_combi >= ((state0->mpu.tmax + 8) << 16)) {
922 printk(KERN_WARNING "Warning ! Temperature way above maximum (%d) !\n",
923 temp_combi >> 16);
924 state0->overtemp += CPU_MAX_OVERTEMP / 4;
925 } else if (temp_combi > (state0->mpu.tmax << 16))
926 state0->overtemp++;
927 else
928 state0->overtemp = 0;
929 if (state0->overtemp >= CPU_MAX_OVERTEMP)
930 critical_state = 1;
931 if (state0->overtemp > 0) {
932 state0->rpm = state0->mpu.rmaxn_exhaust_fan;
933 state0->intake_rpm = intake = state0->mpu.rmaxn_intake_fan;
934 pump = state0->pump_max;
935 goto do_set_fans;
936 }
937
938 /* Do the PID */