2 * Device driver for the thermostats & fan controller of the
3 * Apple G5 "PowerMac7,2" desktop machines.
5 * (c) Copyright IBM Corp. 2003-2004
7 * Maintained by: Benjamin Herrenschmidt
8 * <benh@kernel.crashing.org>
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.
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
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.
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
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
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
62 * - Read fan speed from FCU, low level fan routines now deal
63 * with errors & check fan status, though higher level don't
65 * - Move a bunch of definitions to .h file
68 * - Fix build on ppc64 kernel
69 * - Move back statics definitions to .c file
70 * - Avoid calling schedule_timeout with a negative number
73 * - Fix typo when reading back fan speed on 2 CPU machines
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
84 * - Add device-tree lookup for fan IDs, should detect liquid cooling
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
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
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/i2c.h>
108 #include <linux/slab.h>
109 #include <linux/init.h>
110 #include <linux/spinlock.h>
111 #include <linux/smp_lock.h>
112 #include <linux/wait.h>
113 #include <linux/reboot.h>
114 #include <linux/kmod.h>
115 #include <linux/i2c.h>
116 #include <linux/i2c-dev.h>
117 #include <asm/prom.h>
118 #include <asm/machdep.h>
120 #include <asm/system.h>
121 #include <asm/sections.h>
122 #include <asm/of_device.h>
123 #include <asm/macio.h>
125 #include "therm_pm72.h"
127 #define VERSION "1.2b2"
132 #define DBG(args...) printk(args)
134 #define DBG(args...) do { } while(0)
142 static struct of_device * of_dev;
143 static struct i2c_adapter * u3_0;
144 static struct i2c_adapter * u3_1;
145 static struct i2c_adapter * k2;
146 static struct i2c_client * fcu;
147 static struct cpu_pid_state cpu_state[2];
148 static struct basckside_pid_params backside_params;
149 static struct backside_pid_state backside_state;
150 static struct drives_pid_state drives_state;
151 static struct dimm_pid_state dimms_state;
153 static int cpu_count;
154 static int cpu_pid_type;
155 static pid_t ctrl_task;
156 static struct completion ctrl_complete;
157 static int critical_state;
159 static s32 dimm_output_clamp;
161 static DECLARE_MUTEX(driver_lock);
164 * We have 3 types of CPU PID control. One is "split" old style control
165 * for intake & exhaust fans, the other is "combined" control for both
166 * CPUs that also deals with the pumps when present. To be "compatible"
167 * with OS X at this point, we only use "COMBINED" on the machines that
168 * are identified as having the pumps (though that identification is at
169 * least dodgy). Ultimately, we could probably switch completely to this
170 * algorithm provided we hack it to deal with the UP case
172 #define CPU_PID_TYPE_SPLIT 0
173 #define CPU_PID_TYPE_COMBINED 1
174 #define CPU_PID_TYPE_RACKMAC 2
177 * This table describes all fans in the FCU. The "id" and "type" values
178 * are defaults valid for all earlier machines. Newer machines will
179 * eventually override the table content based on the device-tree
183 char* loc; /* location code */
184 int type; /* 0 = rpm, 1 = pwm, 2 = pump */
185 int id; /* id or -1 */
188 #define FCU_FAN_RPM 0
189 #define FCU_FAN_PWM 1
191 #define FCU_FAN_ABSENT_ID -1
193 #define FCU_FAN_COUNT ARRAY_SIZE(fcu_fans)
195 struct fcu_fan_table fcu_fans[] = {
196 [BACKSIDE_FAN_PWM_INDEX] = {
197 .loc = "BACKSIDE,SYS CTRLR FAN",
199 .id = BACKSIDE_FAN_PWM_DEFAULT_ID,
201 [DRIVES_FAN_RPM_INDEX] = {
204 .id = DRIVES_FAN_RPM_DEFAULT_ID,
206 [SLOTS_FAN_PWM_INDEX] = {
207 .loc = "SLOT,PCI FAN",
209 .id = SLOTS_FAN_PWM_DEFAULT_ID,
211 [CPUA_INTAKE_FAN_RPM_INDEX] = {
212 .loc = "CPU A INTAKE",
214 .id = CPUA_INTAKE_FAN_RPM_DEFAULT_ID,
216 [CPUA_EXHAUST_FAN_RPM_INDEX] = {
217 .loc = "CPU A EXHAUST",
219 .id = CPUA_EXHAUST_FAN_RPM_DEFAULT_ID,
221 [CPUB_INTAKE_FAN_RPM_INDEX] = {
222 .loc = "CPU B INTAKE",
224 .id = CPUB_INTAKE_FAN_RPM_DEFAULT_ID,
226 [CPUB_EXHAUST_FAN_RPM_INDEX] = {
227 .loc = "CPU B EXHAUST",
229 .id = CPUB_EXHAUST_FAN_RPM_DEFAULT_ID,
231 /* pumps aren't present by default, have to be looked up in the
234 [CPUA_PUMP_RPM_INDEX] = {
237 .id = FCU_FAN_ABSENT_ID,
239 [CPUB_PUMP_RPM_INDEX] = {
242 .id = FCU_FAN_ABSENT_ID,
245 [CPU_A1_FAN_RPM_INDEX] = {
248 .id = FCU_FAN_ABSENT_ID,
250 [CPU_A2_FAN_RPM_INDEX] = {
253 .id = FCU_FAN_ABSENT_ID,
255 [CPU_A3_FAN_RPM_INDEX] = {
258 .id = FCU_FAN_ABSENT_ID,
260 [CPU_B1_FAN_RPM_INDEX] = {
263 .id = FCU_FAN_ABSENT_ID,
265 [CPU_B2_FAN_RPM_INDEX] = {
268 .id = FCU_FAN_ABSENT_ID,
270 [CPU_B3_FAN_RPM_INDEX] = {
273 .id = FCU_FAN_ABSENT_ID,
278 * i2c_driver structure to attach to the host i2c controller
281 static int therm_pm72_attach(struct i2c_adapter *adapter);
282 static int therm_pm72_detach(struct i2c_adapter *adapter);
284 static struct i2c_driver therm_pm72_driver =
287 .owner = THIS_MODULE,
288 .name = "therm_pm72",
290 .attach_adapter = therm_pm72_attach,
291 .detach_adapter = therm_pm72_detach,
295 * Utility function to create an i2c_client structure and
296 * attach it to one of u3 adapters
298 static struct i2c_client *attach_i2c_chip(int id, const char *name)
300 struct i2c_client *clt;
301 struct i2c_adapter *adap;
312 clt = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
315 memset(clt, 0, sizeof(struct i2c_client));
317 clt->addr = (id >> 1) & 0x7f;
319 clt->driver = &therm_pm72_driver;
320 strncpy(clt->name, name, I2C_NAME_SIZE-1);
322 if (i2c_attach_client(clt)) {
323 printk(KERN_ERR "therm_pm72: Failed to attach to i2c ID 0x%x\n", id);
331 * Utility function to get rid of the i2c_client structure
332 * (will also detach from the adapter hopepfully)
334 static void detach_i2c_chip(struct i2c_client *clt)
336 i2c_detach_client(clt);
341 * Here are the i2c chip access wrappers
344 static void initialize_adc(struct cpu_pid_state *state)
349 /* Read ADC the configuration register and cache it. We
350 * also make sure Config2 contains proper values, I've seen
351 * cases where we got stale grabage in there, thus preventing
352 * proper reading of conv. values
358 i2c_master_send(state->monitor, buf, 2);
360 /* Read & cache Config1 */
362 rc = i2c_master_send(state->monitor, buf, 1);
364 rc = i2c_master_recv(state->monitor, buf, 1);
366 state->adc_config = buf[0];
367 DBG("ADC config reg: %02x\n", state->adc_config);
368 /* Disable shutdown mode */
369 state->adc_config &= 0xfe;
371 buf[1] = state->adc_config;
372 rc = i2c_master_send(state->monitor, buf, 2);
376 printk(KERN_ERR "therm_pm72: Error reading ADC config"
380 static int read_smon_adc(struct cpu_pid_state *state, int chan)
382 int rc, data, tries = 0;
388 buf[1] = (state->adc_config & 0x1f) | (chan << 5);
389 rc = i2c_master_send(state->monitor, buf, 2);
392 /* Wait for convertion */
394 /* Switch to data register */
396 rc = i2c_master_send(state->monitor, buf, 1);
400 rc = i2c_master_recv(state->monitor, buf, 2);
403 data = ((u16)buf[0]) << 8 | (u16)buf[1];
406 DBG("Error reading ADC, retrying...\n");
408 printk(KERN_ERR "therm_pm72: Error reading ADC !\n");
415 static int read_lm87_reg(struct i2c_client * chip, int reg)
423 rc = i2c_master_send(chip, &buf, 1);
426 rc = i2c_master_recv(chip, &buf, 1);
431 DBG("Error reading LM87, retrying...\n");
433 printk(KERN_ERR "therm_pm72: Error reading LM87 !\n");
440 static int fan_read_reg(int reg, unsigned char *buf, int nb)
447 nw = i2c_master_send(fcu, buf, 1);
448 if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100)
454 printk(KERN_ERR "Failure writing address to FCU: %d", nw);
459 nr = i2c_master_recv(fcu, buf, nb);
460 if (nr > 0 || (nr < 0 && nr != ENODEV) || tries >= 100)
466 printk(KERN_ERR "Failure reading data from FCU: %d", nw);
470 static int fan_write_reg(int reg, const unsigned char *ptr, int nb)
473 unsigned char buf[16];
476 memcpy(buf+1, ptr, nb);
480 nw = i2c_master_send(fcu, buf, nb);
481 if (nw > 0 || (nw < 0 && nw != EIO) || tries >= 100)
487 printk(KERN_ERR "Failure writing to FCU: %d", nw);
491 static int start_fcu(void)
493 unsigned char buf = 0xff;
496 rc = fan_write_reg(0xe, &buf, 1);
499 rc = fan_write_reg(0x2e, &buf, 1);
505 static int set_rpm_fan(int fan_index, int rpm)
507 unsigned char buf[2];
510 if (fcu_fans[fan_index].type != FCU_FAN_RPM)
512 id = fcu_fans[fan_index].id;
513 if (id == FCU_FAN_ABSENT_ID)
522 rc = fan_write_reg(0x10 + (id * 2), buf, 2);
528 static int get_rpm_fan(int fan_index, int programmed)
530 unsigned char failure;
531 unsigned char active;
532 unsigned char buf[2];
533 int rc, id, reg_base;
535 if (fcu_fans[fan_index].type != FCU_FAN_RPM)
537 id = fcu_fans[fan_index].id;
538 if (id == FCU_FAN_ABSENT_ID)
541 rc = fan_read_reg(0xb, &failure, 1);
544 if ((failure & (1 << id)) != 0)
546 rc = fan_read_reg(0xd, &active, 1);
549 if ((active & (1 << id)) == 0)
552 /* Programmed value or real current speed */
553 reg_base = programmed ? 0x10 : 0x11;
554 rc = fan_read_reg(reg_base + (id * 2), buf, 2);
558 return (buf[0] << 5) | buf[1] >> 3;
561 static int set_pwm_fan(int fan_index, int pwm)
563 unsigned char buf[2];
566 if (fcu_fans[fan_index].type != FCU_FAN_PWM)
568 id = fcu_fans[fan_index].id;
569 if (id == FCU_FAN_ABSENT_ID)
576 pwm = (pwm * 2559) / 1000;
578 rc = fan_write_reg(0x30 + (id * 2), buf, 1);
584 static int get_pwm_fan(int fan_index)
586 unsigned char failure;
587 unsigned char active;
588 unsigned char buf[2];
591 if (fcu_fans[fan_index].type != FCU_FAN_PWM)
593 id = fcu_fans[fan_index].id;
594 if (id == FCU_FAN_ABSENT_ID)
597 rc = fan_read_reg(0x2b, &failure, 1);
600 if ((failure & (1 << id)) != 0)
602 rc = fan_read_reg(0x2d, &active, 1);
605 if ((active & (1 << id)) == 0)
608 /* Programmed value or real current speed */
609 rc = fan_read_reg(0x30 + (id * 2), buf, 1);
613 return (buf[0] * 1000) / 2559;
617 * Utility routine to read the CPU calibration EEPROM data
618 * from the device-tree
620 static int read_eeprom(int cpu, struct mpu_data *out)
622 struct device_node *np;
627 /* prom.c routine for finding a node by path is a bit brain dead
628 * and requires exact @xxx unit numbers. This is a bit ugly but
629 * will work for these machines
631 sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0);
632 np = of_find_node_by_path(nodename);
634 printk(KERN_ERR "therm_pm72: Failed to retreive cpuid node from device-tree\n");
637 data = (u8 *)get_property(np, "cpuid", &len);
639 printk(KERN_ERR "therm_pm72: Failed to retreive cpuid property from device-tree\n");
643 memcpy(out, data, sizeof(struct mpu_data));
649 static void fetch_cpu_pumps_minmax(void)
651 struct cpu_pid_state *state0 = &cpu_state[0];
652 struct cpu_pid_state *state1 = &cpu_state[1];
653 u16 pump_min = 0, pump_max = 0xffff;
656 /* Try to fetch pumps min/max infos from eeprom */
658 memcpy(&tmp, &state0->mpu.processor_part_num, 8);
659 if (tmp[0] != 0xffff && tmp[1] != 0xffff) {
660 pump_min = max(pump_min, tmp[0]);
661 pump_max = min(pump_max, tmp[1]);
663 if (tmp[2] != 0xffff && tmp[3] != 0xffff) {
664 pump_min = max(pump_min, tmp[2]);
665 pump_max = min(pump_max, tmp[3]);
668 /* Double check the values, this _IS_ needed as the EEPROM on
669 * some dual 2.5Ghz G5s seem, at least, to have both min & max
670 * same to the same value ... (grrrr)
672 if (pump_min == pump_max || pump_min == 0 || pump_max == 0xffff) {
673 pump_min = CPU_PUMP_OUTPUT_MIN;
674 pump_max = CPU_PUMP_OUTPUT_MAX;
677 state0->pump_min = state1->pump_min = pump_min;
678 state0->pump_max = state1->pump_max = pump_max;
682 * Now, unfortunately, sysfs doesn't give us a nice void * we could
683 * pass around to the attribute functions, so we don't really have
684 * choice but implement a bunch of them...
686 * That sucks a bit, we take the lock because FIX32TOPRINT evaluates
687 * the input twice... I accept patches :)
689 #define BUILD_SHOW_FUNC_FIX(name, data) \
690 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
693 down(&driver_lock); \
694 r = sprintf(buf, "%d.%03d", FIX32TOPRINT(data)); \
698 #define BUILD_SHOW_FUNC_INT(name, data) \
699 static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \
701 return sprintf(buf, "%d", data); \
704 BUILD_SHOW_FUNC_FIX(cpu0_temperature, cpu_state[0].last_temp)
705 BUILD_SHOW_FUNC_FIX(cpu0_voltage, cpu_state[0].voltage)
706 BUILD_SHOW_FUNC_FIX(cpu0_current, cpu_state[0].current_a)
707 BUILD_SHOW_FUNC_INT(cpu0_exhaust_fan_rpm, cpu_state[0].rpm)
708 BUILD_SHOW_FUNC_INT(cpu0_intake_fan_rpm, cpu_state[0].intake_rpm)
710 BUILD_SHOW_FUNC_FIX(cpu1_temperature, cpu_state[1].last_temp)
711 BUILD_SHOW_FUNC_FIX(cpu1_voltage, cpu_state[1].voltage)
712 BUILD_SHOW_FUNC_FIX(cpu1_current, cpu_state[1].current_a)
713 BUILD_SHOW_FUNC_INT(cpu1_exhaust_fan_rpm, cpu_state[1].rpm)
714 BUILD_SHOW_FUNC_INT(cpu1_intake_fan_rpm, cpu_state[1].intake_rpm)
716 BUILD_SHOW_FUNC_FIX(backside_temperature, backside_state.last_temp)
717 BUILD_SHOW_FUNC_INT(backside_fan_pwm, backside_state.pwm)
719 BUILD_SHOW_FUNC_FIX(drives_temperature, drives_state.last_temp)
720 BUILD_SHOW_FUNC_INT(drives_fan_rpm, drives_state.rpm)
722 BUILD_SHOW_FUNC_FIX(dimms_temperature, dimms_state.last_temp)
724 static DEVICE_ATTR(cpu0_temperature,S_IRUGO,show_cpu0_temperature,NULL);
725 static DEVICE_ATTR(cpu0_voltage,S_IRUGO,show_cpu0_voltage,NULL);
726 static DEVICE_ATTR(cpu0_current,S_IRUGO,show_cpu0_current,NULL);
727 static DEVICE_ATTR(cpu0_exhaust_fan_rpm,S_IRUGO,show_cpu0_exhaust_fan_rpm,NULL);
728 static DEVICE_ATTR(cpu0_intake_fan_rpm,S_IRUGO,show_cpu0_intake_fan_rpm,NULL);
730 static DEVICE_ATTR(cpu1_temperature,S_IRUGO,show_cpu1_temperature,NULL);
731 static DEVICE_ATTR(cpu1_voltage,S_IRUGO,show_cpu1_voltage,NULL);
732 static DEVICE_ATTR(cpu1_current,S_IRUGO,show_cpu1_current,NULL);
733 static DEVICE_ATTR(cpu1_exhaust_fan_rpm,S_IRUGO,show_cpu1_exhaust_fan_rpm,NULL);
734 static DEVICE_ATTR(cpu1_intake_fan_rpm,S_IRUGO,show_cpu1_intake_fan_rpm,NULL);
736 static DEVICE_ATTR(backside_temperature,S_IRUGO,show_backside_temperature,NULL);
737 static DEVICE_ATTR(backside_fan_pwm,S_IRUGO,show_backside_fan_pwm,NULL);
739 static DEVICE_ATTR(drives_temperature,S_IRUGO,show_drives_temperature,NULL);
740 static DEVICE_ATTR(drives_fan_rpm,S_IRUGO,show_drives_fan_rpm,NULL);
742 static DEVICE_ATTR(dimms_temperature,S_IRUGO,show_dimms_temperature,NULL);
745 * CPUs fans control loop
748 static int do_read_one_cpu_values(struct cpu_pid_state *state, s32 *temp, s32 *power)
750 s32 ltemp, volts, amps;
753 /* Default (in case of error) */
754 *temp = state->cur_temp;
755 *power = state->cur_power;
757 if (cpu_pid_type == CPU_PID_TYPE_RACKMAC)
758 index = (state->index == 0) ?
759 CPU_A1_FAN_RPM_INDEX : CPU_B1_FAN_RPM_INDEX;
761 index = (state->index == 0) ?
762 CPUA_EXHAUST_FAN_RPM_INDEX : CPUB_EXHAUST_FAN_RPM_INDEX;
764 /* Read current fan status */
765 rc = get_rpm_fan(index, !RPM_PID_USE_ACTUAL_SPEED);
767 /* XXX What do we do now ? Nothing for now, keep old value, but
768 * return error upstream
770 DBG(" cpu %d, fan reading error !\n", state->index);
773 DBG(" cpu %d, exhaust RPM: %d\n", state->index, state->rpm);
776 /* Get some sensor readings and scale it */
777 ltemp = read_smon_adc(state, 1);
779 /* XXX What do we do now ? */
783 DBG(" cpu %d, temp reading error !\n", state->index);
785 /* Fixup temperature according to diode calibration
787 DBG(" cpu %d, temp raw: %04x, m_diode: %04x, b_diode: %04x\n",
789 ltemp, state->mpu.mdiode, state->mpu.bdiode);
790 *temp = ((s32)ltemp * (s32)state->mpu.mdiode + ((s32)state->mpu.bdiode << 12)) >> 2;
791 state->last_temp = *temp;
792 DBG(" temp: %d.%03d\n", FIX32TOPRINT((*temp)));
796 * Read voltage & current and calculate power
798 volts = read_smon_adc(state, 3);
799 amps = read_smon_adc(state, 4);
801 /* Scale voltage and current raw sensor values according to fixed scales
802 * obtained in Darwin and calculate power from I and V
804 volts *= ADC_CPU_VOLTAGE_SCALE;
805 amps *= ADC_CPU_CURRENT_SCALE;
806 *power = (((u64)volts) * ((u64)amps)) >> 16;
807 state->voltage = volts;
808 state->current_a = amps;
809 state->last_power = *power;
811 DBG(" cpu %d, current: %d.%03d, voltage: %d.%03d, power: %d.%03d W\n",
812 state->index, FIX32TOPRINT(state->current_a),
813 FIX32TOPRINT(state->voltage), FIX32TOPRINT(*power));
818 static void do_cpu_pid(struct cpu_pid_state *state, s32 temp, s32 power)
820 s32 power_target, integral, derivative, proportional, adj_in_target, sval;
821 s64 integ_p, deriv_p, prop_p, sum;
824 /* Calculate power target value (could be done once for all)
825 * and convert to a 16.16 fp number
827 power_target = ((u32)(state->mpu.pmaxh - state->mpu.padjmax)) << 16;
828 DBG(" power target: %d.%03d, error: %d.%03d\n",
829 FIX32TOPRINT(power_target), FIX32TOPRINT(power_target - power));
831 /* Store temperature and power in history array */
832 state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE;
833 state->temp_history[state->cur_temp] = temp;
834 state->cur_power = (state->cur_power + 1) % state->count_power;
835 state->power_history[state->cur_power] = power;
836 state->error_history[state->cur_power] = power_target - power;
838 /* If first loop, fill the history table */
840 for (i = 0; i < (state->count_power - 1); i++) {
841 state->cur_power = (state->cur_power + 1) % state->count_power;
842 state->power_history[state->cur_power] = power;
843 state->error_history[state->cur_power] = power_target - power;
845 for (i = 0; i < (CPU_TEMP_HISTORY_SIZE - 1); i++) {
846 state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE;
847 state->temp_history[state->cur_temp] = temp;
852 /* Calculate the integral term normally based on the "power" values */
855 for (i = 0; i < state->count_power; i++)
856 integral += state->error_history[i];
857 integral *= CPU_PID_INTERVAL;
858 DBG(" integral: %08x\n", integral);
860 /* Calculate the adjusted input (sense value).
863 * so the result is 28.36
865 * input target is mpu.ttarget, input max is mpu.tmax
867 integ_p = ((s64)state->mpu.pid_gr) * (s64)integral;
868 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
869 sval = (state->mpu.tmax << 16) - ((integ_p >> 20) & 0xffffffff);
870 adj_in_target = (state->mpu.ttarget << 16);
871 if (adj_in_target > sval)
872 adj_in_target = sval;
873 DBG(" adj_in_target: %d.%03d, ttarget: %d\n", FIX32TOPRINT(adj_in_target),
876 /* Calculate the derivative term */
877 derivative = state->temp_history[state->cur_temp] -
878 state->temp_history[(state->cur_temp + CPU_TEMP_HISTORY_SIZE - 1)
879 % CPU_TEMP_HISTORY_SIZE];
880 derivative /= CPU_PID_INTERVAL;
881 deriv_p = ((s64)state->mpu.pid_gd) * (s64)derivative;
882 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
885 /* Calculate the proportional term */
886 proportional = temp - adj_in_target;
887 prop_p = ((s64)state->mpu.pid_gp) * (s64)proportional;
888 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
894 DBG(" sum: %d\n", (int)sum);
895 state->rpm += (s32)sum;
898 static void do_monitor_cpu_combined(void)
900 struct cpu_pid_state *state0 = &cpu_state[0];
901 struct cpu_pid_state *state1 = &cpu_state[1];
902 s32 temp0, power0, temp1, power1;
903 s32 temp_combi, power_combi;
904 int rc, intake, pump;
906 rc = do_read_one_cpu_values(state0, &temp0, &power0);
908 /* XXX What do we do now ? */
910 state1->overtemp = 0;
911 rc = do_read_one_cpu_values(state1, &temp1, &power1);
913 /* XXX What do we do now ? */
915 if (state1->overtemp)
918 temp_combi = max(temp0, temp1);
919 power_combi = max(power0, power1);
921 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
922 * full blown immediately and try to trigger a shutdown
924 if (temp_combi >= ((state0->mpu.tmax + 8) << 16)) {
925 printk(KERN_WARNING "Warning ! Temperature way above maximum (%d) !\n",
927 state0->overtemp += CPU_MAX_OVERTEMP / 4;
928 } else if (temp_combi > (state0->mpu.tmax << 16))
931 state0->overtemp = 0;
932 if (state0->overtemp >= CPU_MAX_OVERTEMP)
934 if (state0->overtemp > 0) {
935 state0->rpm = state0->mpu.rmaxn_exhaust_fan;
936 state0->intake_rpm = intake = state0->mpu.rmaxn_intake_fan;
937 pump = state0->pump_max;
942 do_cpu_pid(state0, temp_combi, power_combi);
945 state0->rpm = max(state0->rpm, (int)state0->mpu.rminn_exhaust_fan);
946 state0->rpm = min(state0->rpm, (int)state0->mpu.rmaxn_exhaust_fan);
948 /* Calculate intake fan speed */
949 intake = (state0->rpm * CPU_INTAKE_SCALE) >> 16;
950 intake = max(intake, (int)state0->mpu.rminn_intake_fan);
951 intake = min(intake, (int)state0->mpu.rmaxn_intake_fan);
952 state0->intake_rpm = intake;
954 /* Calculate pump speed */
955 pump = (state0->rpm * state0->pump_max) /
956 state0->mpu.rmaxn_exhaust_fan;
957 pump = min(pump, state0->pump_max);
958 pump = max(pump, state0->pump_min);
961 /* We copy values from state 0 to state 1 for /sysfs */
962 state1->rpm = state0->rpm;
963 state1->intake_rpm = state0->intake_rpm;
965 DBG("** CPU %d RPM: %d Ex, %d, Pump: %d, In, overtemp: %d\n",
966 state1->index, (int)state1->rpm, intake, pump, state1->overtemp);
968 /* We should check for errors, shouldn't we ? But then, what
969 * do we do once the error occurs ? For FCU notified fan
970 * failures (-EFAULT) we probably want to notify userland
973 set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake);
974 set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state0->rpm);
975 set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake);
976 set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state0->rpm);
978 if (fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID)
979 set_rpm_fan(CPUA_PUMP_RPM_INDEX, pump);
980 if (fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID)
981 set_rpm_fan(CPUB_PUMP_RPM_INDEX, pump);
984 static void do_monitor_cpu_split(struct cpu_pid_state *state)
989 /* Read current fan status */
990 rc = do_read_one_cpu_values(state, &temp, &power);
992 /* XXX What do we do now ? */
995 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
996 * full blown immediately and try to trigger a shutdown
998 if (temp >= ((state->mpu.tmax + 8) << 16)) {
999 printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum"
1001 state->index, temp >> 16);
1002 state->overtemp += CPU_MAX_OVERTEMP / 4;
1003 } else if (temp > (state->mpu.tmax << 16))
1006 state->overtemp = 0;
1007 if (state->overtemp >= CPU_MAX_OVERTEMP)
1009 if (state->overtemp > 0) {
1010 state->rpm = state->mpu.rmaxn_exhaust_fan;
1011 state->intake_rpm = intake = state->mpu.rmaxn_intake_fan;
1016 do_cpu_pid(state, temp, power);
1019 state->rpm = max(state->rpm, (int)state->mpu.rminn_exhaust_fan);
1020 state->rpm = min(state->rpm, (int)state->mpu.rmaxn_exhaust_fan);
1022 /* Calculate intake fan */
1023 intake = (state->rpm * CPU_INTAKE_SCALE) >> 16;
1024 intake = max(intake, (int)state->mpu.rminn_intake_fan);
1025 intake = min(intake, (int)state->mpu.rmaxn_intake_fan);
1026 state->intake_rpm = intake;
1029 DBG("** CPU %d RPM: %d Ex, %d In, overtemp: %d\n",
1030 state->index, (int)state->rpm, intake, state->overtemp);
1032 /* We should check for errors, shouldn't we ? But then, what
1033 * do we do once the error occurs ? For FCU notified fan
1034 * failures (-EFAULT) we probably want to notify userland
1037 if (state->index == 0) {
1038 set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake);
1039 set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state->rpm);
1041 set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake);
1042 set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state->rpm);
1046 static void do_monitor_cpu_rack(struct cpu_pid_state *state)
1048 s32 temp, power, fan_min;
1051 /* Read current fan status */
1052 rc = do_read_one_cpu_values(state, &temp, &power);
1054 /* XXX What do we do now ? */
1057 /* Check tmax, increment overtemp if we are there. At tmax+8, we go
1058 * full blown immediately and try to trigger a shutdown
1060 if (temp >= ((state->mpu.tmax + 8) << 16)) {
1061 printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum"
1063 state->index, temp >> 16);
1064 state->overtemp = CPU_MAX_OVERTEMP / 4;
1065 } else if (temp > (state->mpu.tmax << 16))
1068 state->overtemp = 0;
1069 if (state->overtemp >= CPU_MAX_OVERTEMP)
1071 if (state->overtemp > 0) {
1072 state->rpm = state->intake_rpm = state->mpu.rmaxn_intake_fan;
1077 do_cpu_pid(state, temp, power);
1079 /* Check clamp from dimms */
1080 fan_min = dimm_output_clamp;
1081 fan_min = max(fan_min, (int)state->mpu.rminn_intake_fan);
1083 state->rpm = max(state->rpm, (int)fan_min);
1084 state->rpm = min(state->rpm, (int)state->mpu.rmaxn_intake_fan);
1085 state->intake_rpm = state->rpm;
1088 DBG("** CPU %d RPM: %d overtemp: %d\n",
1089 state->index, (int)state->rpm, state->overtemp);
1091 /* We should check for errors, shouldn't we ? But then, what
1092 * do we do once the error occurs ? For FCU notified fan
1093 * failures (-EFAULT) we probably want to notify userland
1096 if (state->index == 0) {
1097 set_rpm_fan(CPU_A1_FAN_RPM_INDEX, state->rpm);
1098 set_rpm_fan(CPU_A2_FAN_RPM_INDEX, state->rpm);
1099 set_rpm_fan(CPU_A3_FAN_RPM_INDEX, state->rpm);
1101 set_rpm_fan(CPU_B1_FAN_RPM_INDEX, state->rpm);
1102 set_rpm_fan(CPU_B2_FAN_RPM_INDEX, state->rpm);
1103 set_rpm_fan(CPU_B3_FAN_RPM_INDEX, state->rpm);
1108 * Initialize the state structure for one CPU control loop
1110 static int init_cpu_state(struct cpu_pid_state *state, int index)
1112 state->index = index;
1114 state->rpm = (cpu_pid_type == CPU_PID_TYPE_RACKMAC) ? 4000 : 1000;
1115 state->overtemp = 0;
1116 state->adc_config = 0x00;
1120 state->monitor = attach_i2c_chip(SUPPLY_MONITOR_ID, "CPU0_monitor");
1121 else if (index == 1)
1122 state->monitor = attach_i2c_chip(SUPPLY_MONITORB_ID, "CPU1_monitor");
1123 if (state->monitor == NULL)
1126 if (read_eeprom(index, &state->mpu))
1129 state->count_power = state->mpu.tguardband;
1130 if (state->count_power > CPU_POWER_HISTORY_SIZE) {
1131 printk(KERN_WARNING "Warning ! too many power history slots\n");
1132 state->count_power = CPU_POWER_HISTORY_SIZE;
1134 DBG("CPU %d Using %d power history entries\n", index, state->count_power);
1137 device_create_file(&of_dev->dev, &dev_attr_cpu0_temperature);
1138 device_create_file(&of_dev->dev, &dev_attr_cpu0_voltage);
1139 device_create_file(&of_dev->dev, &dev_attr_cpu0_current);
1140 device_create_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm);
1141 device_create_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm);
1143 device_create_file(&of_dev->dev, &dev_attr_cpu1_temperature);
1144 device_create_file(&of_dev->dev, &dev_attr_cpu1_voltage);
1145 device_create_file(&of_dev->dev, &dev_attr_cpu1_current);
1146 device_create_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm);
1147 device_create_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm);
1153 detach_i2c_chip(state->monitor);
1154 state->monitor = NULL;
1160 * Dispose of the state data for one CPU control loop
1162 static void dispose_cpu_state(struct cpu_pid_state *state)
1164 if (state->monitor == NULL)
1167 if (state->index == 0) {
1168 device_remove_file(&of_dev->dev, &dev_attr_cpu0_temperature);
1169 device_remove_file(&of_dev->dev, &dev_attr_cpu0_voltage);
1170 device_remove_file(&of_dev->dev, &dev_attr_cpu0_current);
1171 device_remove_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm);
1172 device_remove_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm);
1174 device_remove_file(&of_dev->dev, &dev_attr_cpu1_temperature);
1175 device_remove_file(&of_dev->dev, &dev_attr_cpu1_voltage);
1176 device_remove_file(&of_dev->dev, &dev_attr_cpu1_current);
1177 device_remove_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm);
1178 device_remove_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm);
1181 detach_i2c_chip(state->monitor);
1182 state->monitor = NULL;
1186 * Motherboard backside & U3 heatsink fan control loop
1188 static void do_monitor_backside(struct backside_pid_state *state)
1190 s32 temp, integral, derivative, fan_min;
1191 s64 integ_p, deriv_p, prop_p, sum;
1194 if (--state->ticks != 0)
1196 state->ticks = backside_params.interval;
1200 /* Check fan status */
1201 rc = get_pwm_fan(BACKSIDE_FAN_PWM_INDEX);
1203 printk(KERN_WARNING "Error %d reading backside fan !\n", rc);
1204 /* XXX What do we do now ? */
1207 DBG(" current pwm: %d\n", state->pwm);
1209 /* Get some sensor readings */
1210 temp = i2c_smbus_read_byte_data(state->monitor, MAX6690_EXT_TEMP) << 16;
1211 state->last_temp = temp;
1212 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1213 FIX32TOPRINT(backside_params.input_target));
1215 /* Store temperature and error in history array */
1216 state->cur_sample = (state->cur_sample + 1) % BACKSIDE_PID_HISTORY_SIZE;
1217 state->sample_history[state->cur_sample] = temp;
1218 state->error_history[state->cur_sample] = temp - backside_params.input_target;
1220 /* If first loop, fill the history table */
1222 for (i = 0; i < (BACKSIDE_PID_HISTORY_SIZE - 1); i++) {
1223 state->cur_sample = (state->cur_sample + 1) %
1224 BACKSIDE_PID_HISTORY_SIZE;
1225 state->sample_history[state->cur_sample] = temp;
1226 state->error_history[state->cur_sample] =
1227 temp - backside_params.input_target;
1232 /* Calculate the integral term */
1235 for (i = 0; i < BACKSIDE_PID_HISTORY_SIZE; i++)
1236 integral += state->error_history[i];
1237 integral *= backside_params.interval;
1238 DBG(" integral: %08x\n", integral);
1239 integ_p = ((s64)backside_params.G_r) * (s64)integral;
1240 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1243 /* Calculate the derivative term */
1244 derivative = state->error_history[state->cur_sample] -
1245 state->error_history[(state->cur_sample + BACKSIDE_PID_HISTORY_SIZE - 1)
1246 % BACKSIDE_PID_HISTORY_SIZE];
1247 derivative /= backside_params.interval;
1248 deriv_p = ((s64)backside_params.G_d) * (s64)derivative;
1249 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1252 /* Calculate the proportional term */
1253 prop_p = ((s64)backside_params.G_p) * (s64)(state->error_history[state->cur_sample]);
1254 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1260 DBG(" sum: %d\n", (int)sum);
1261 if (backside_params.additive)
1262 state->pwm += (s32)sum;
1266 /* Check for clamp */
1267 fan_min = (dimm_output_clamp * 100) / 14000;
1268 fan_min = max(fan_min, backside_params.output_min);
1270 state->pwm = max(state->pwm, fan_min);
1271 state->pwm = min(state->pwm, backside_params.output_max);
1273 DBG("** BACKSIDE PWM: %d\n", (int)state->pwm);
1274 set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, state->pwm);
1278 * Initialize the state structure for the backside fan control loop
1280 static int init_backside_state(struct backside_pid_state *state)
1282 struct device_node *u3;
1283 int u3h = 1; /* conservative by default */
1286 * There are different PID params for machines with U3 and machines
1287 * with U3H, pick the right ones now
1289 u3 = of_find_node_by_path("/u3@0,f8000000");
1291 u32 *vers = (u32 *)get_property(u3, "device-rev", NULL);
1293 if (((*vers) & 0x3f) < 0x34)
1299 backside_params.G_d = BACKSIDE_PID_RACK_G_d;
1300 backside_params.input_target = BACKSIDE_PID_RACK_INPUT_TARGET;
1301 backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN;
1302 backside_params.interval = BACKSIDE_PID_RACK_INTERVAL;
1303 backside_params.G_p = BACKSIDE_PID_RACK_G_p;
1304 backside_params.G_r = BACKSIDE_PID_G_r;
1305 backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX;
1306 backside_params.additive = 0;
1308 backside_params.G_d = BACKSIDE_PID_U3H_G_d;
1309 backside_params.input_target = BACKSIDE_PID_U3H_INPUT_TARGET;
1310 backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN;
1311 backside_params.interval = BACKSIDE_PID_INTERVAL;
1312 backside_params.G_p = BACKSIDE_PID_G_p;
1313 backside_params.G_r = BACKSIDE_PID_G_r;
1314 backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX;
1315 backside_params.additive = 1;
1317 backside_params.G_d = BACKSIDE_PID_U3_G_d;
1318 backside_params.input_target = BACKSIDE_PID_U3_INPUT_TARGET;
1319 backside_params.output_min = BACKSIDE_PID_U3_OUTPUT_MIN;
1320 backside_params.interval = BACKSIDE_PID_INTERVAL;
1321 backside_params.G_p = BACKSIDE_PID_G_p;
1322 backside_params.G_r = BACKSIDE_PID_G_r;
1323 backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX;
1324 backside_params.additive = 1;
1331 state->monitor = attach_i2c_chip(BACKSIDE_MAX_ID, "backside_temp");
1332 if (state->monitor == NULL)
1335 device_create_file(&of_dev->dev, &dev_attr_backside_temperature);
1336 device_create_file(&of_dev->dev, &dev_attr_backside_fan_pwm);
1342 * Dispose of the state data for the backside control loop
1344 static void dispose_backside_state(struct backside_pid_state *state)
1346 if (state->monitor == NULL)
1349 device_remove_file(&of_dev->dev, &dev_attr_backside_temperature);
1350 device_remove_file(&of_dev->dev, &dev_attr_backside_fan_pwm);
1352 detach_i2c_chip(state->monitor);
1353 state->monitor = NULL;
1357 * Drives bay fan control loop
1359 static void do_monitor_drives(struct drives_pid_state *state)
1361 s32 temp, integral, derivative;
1362 s64 integ_p, deriv_p, prop_p, sum;
1365 if (--state->ticks != 0)
1367 state->ticks = DRIVES_PID_INTERVAL;
1371 /* Check fan status */
1372 rc = get_rpm_fan(DRIVES_FAN_RPM_INDEX, !RPM_PID_USE_ACTUAL_SPEED);
1374 printk(KERN_WARNING "Error %d reading drives fan !\n", rc);
1375 /* XXX What do we do now ? */
1378 DBG(" current rpm: %d\n", state->rpm);
1380 /* Get some sensor readings */
1381 temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor, DS1775_TEMP)) << 8;
1382 state->last_temp = temp;
1383 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1384 FIX32TOPRINT(DRIVES_PID_INPUT_TARGET));
1386 /* Store temperature and error in history array */
1387 state->cur_sample = (state->cur_sample + 1) % DRIVES_PID_HISTORY_SIZE;
1388 state->sample_history[state->cur_sample] = temp;
1389 state->error_history[state->cur_sample] = temp - DRIVES_PID_INPUT_TARGET;
1391 /* If first loop, fill the history table */
1393 for (i = 0; i < (DRIVES_PID_HISTORY_SIZE - 1); i++) {
1394 state->cur_sample = (state->cur_sample + 1) %
1395 DRIVES_PID_HISTORY_SIZE;
1396 state->sample_history[state->cur_sample] = temp;
1397 state->error_history[state->cur_sample] =
1398 temp - DRIVES_PID_INPUT_TARGET;
1403 /* Calculate the integral term */
1406 for (i = 0; i < DRIVES_PID_HISTORY_SIZE; i++)
1407 integral += state->error_history[i];
1408 integral *= DRIVES_PID_INTERVAL;
1409 DBG(" integral: %08x\n", integral);
1410 integ_p = ((s64)DRIVES_PID_G_r) * (s64)integral;
1411 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1414 /* Calculate the derivative term */
1415 derivative = state->error_history[state->cur_sample] -
1416 state->error_history[(state->cur_sample + DRIVES_PID_HISTORY_SIZE - 1)
1417 % DRIVES_PID_HISTORY_SIZE];
1418 derivative /= DRIVES_PID_INTERVAL;
1419 deriv_p = ((s64)DRIVES_PID_G_d) * (s64)derivative;
1420 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1423 /* Calculate the proportional term */
1424 prop_p = ((s64)DRIVES_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
1425 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1431 DBG(" sum: %d\n", (int)sum);
1432 state->rpm += (s32)sum;
1434 state->rpm = max(state->rpm, DRIVES_PID_OUTPUT_MIN);
1435 state->rpm = min(state->rpm, DRIVES_PID_OUTPUT_MAX);
1437 DBG("** DRIVES RPM: %d\n", (int)state->rpm);
1438 set_rpm_fan(DRIVES_FAN_RPM_INDEX, state->rpm);
1442 * Initialize the state structure for the drives bay fan control loop
1444 static int init_drives_state(struct drives_pid_state *state)
1450 state->monitor = attach_i2c_chip(DRIVES_DALLAS_ID, "drives_temp");
1451 if (state->monitor == NULL)
1454 device_create_file(&of_dev->dev, &dev_attr_drives_temperature);
1455 device_create_file(&of_dev->dev, &dev_attr_drives_fan_rpm);
1461 * Dispose of the state data for the drives control loop
1463 static void dispose_drives_state(struct drives_pid_state *state)
1465 if (state->monitor == NULL)
1468 device_remove_file(&of_dev->dev, &dev_attr_drives_temperature);
1469 device_remove_file(&of_dev->dev, &dev_attr_drives_fan_rpm);
1471 detach_i2c_chip(state->monitor);
1472 state->monitor = NULL;
1476 * DIMMs temp control loop
1478 static void do_monitor_dimms(struct dimm_pid_state *state)
1480 s32 temp, integral, derivative, fan_min;
1481 s64 integ_p, deriv_p, prop_p, sum;
1484 if (--state->ticks != 0)
1486 state->ticks = DIMM_PID_INTERVAL;
1490 DBG(" current value: %d\n", state->output);
1492 temp = read_lm87_reg(state->monitor, LM87_INT_TEMP);
1496 state->last_temp = temp;
1497 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1498 FIX32TOPRINT(DIMM_PID_INPUT_TARGET));
1500 /* Store temperature and error in history array */
1501 state->cur_sample = (state->cur_sample + 1) % DIMM_PID_HISTORY_SIZE;
1502 state->sample_history[state->cur_sample] = temp;
1503 state->error_history[state->cur_sample] = temp - DIMM_PID_INPUT_TARGET;
1505 /* If first loop, fill the history table */
1507 for (i = 0; i < (DIMM_PID_HISTORY_SIZE - 1); i++) {
1508 state->cur_sample = (state->cur_sample + 1) %
1509 DIMM_PID_HISTORY_SIZE;
1510 state->sample_history[state->cur_sample] = temp;
1511 state->error_history[state->cur_sample] =
1512 temp - DIMM_PID_INPUT_TARGET;
1517 /* Calculate the integral term */
1520 for (i = 0; i < DIMM_PID_HISTORY_SIZE; i++)
1521 integral += state->error_history[i];
1522 integral *= DIMM_PID_INTERVAL;
1523 DBG(" integral: %08x\n", integral);
1524 integ_p = ((s64)DIMM_PID_G_r) * (s64)integral;
1525 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1528 /* Calculate the derivative term */
1529 derivative = state->error_history[state->cur_sample] -
1530 state->error_history[(state->cur_sample + DIMM_PID_HISTORY_SIZE - 1)
1531 % DIMM_PID_HISTORY_SIZE];
1532 derivative /= DIMM_PID_INTERVAL;
1533 deriv_p = ((s64)DIMM_PID_G_d) * (s64)derivative;
1534 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1537 /* Calculate the proportional term */
1538 prop_p = ((s64)DIMM_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
1539 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1545 DBG(" sum: %d\n", (int)sum);
1546 state->output = (s32)sum;
1547 state->output = max(state->output, DIMM_PID_OUTPUT_MIN);
1548 state->output = min(state->output, DIMM_PID_OUTPUT_MAX);
1549 dimm_output_clamp = state->output;
1551 DBG("** DIMM clamp value: %d\n", (int)state->output);
1553 /* Backside PID is only every 5 seconds, force backside fan clamping now */
1554 fan_min = (dimm_output_clamp * 100) / 14000;
1555 fan_min = max(fan_min, backside_params.output_min);
1556 if (backside_state.pwm < fan_min) {
1557 backside_state.pwm = fan_min;
1558 DBG(" -> applying clamp to backside fan now: %d !\n", fan_min);
1559 set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, fan_min);
1564 * Initialize the state structure for the DIMM temp control loop
1566 static int init_dimms_state(struct dimm_pid_state *state)
1570 state->output = 4000;
1572 state->monitor = attach_i2c_chip(XSERVE_DIMMS_LM87, "dimms_temp");
1573 if (state->monitor == NULL)
1576 device_create_file(&of_dev->dev, &dev_attr_dimms_temperature);
1582 * Dispose of the state data for the drives control loop
1584 static void dispose_dimms_state(struct dimm_pid_state *state)
1586 if (state->monitor == NULL)
1589 device_remove_file(&of_dev->dev, &dev_attr_dimms_temperature);
1591 detach_i2c_chip(state->monitor);
1592 state->monitor = NULL;
1595 static int call_critical_overtemp(void)
1597 char *argv[] = { critical_overtemp_path, NULL };
1598 static char *envp[] = { "HOME=/",
1600 "PATH=/sbin:/usr/sbin:/bin:/usr/bin",
1603 return call_usermodehelper(critical_overtemp_path, argv, envp, 0);
1608 * Here's the kernel thread that calls the various control loops
1610 static int main_control_loop(void *x)
1614 DBG("main_control_loop started\n");
1618 if (start_fcu() < 0) {
1619 printk(KERN_ERR "kfand: failed to start FCU\n");
1624 /* Set the PCI fan once for now */
1625 set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM);
1627 /* Initialize ADCs */
1628 initialize_adc(&cpu_state[0]);
1629 if (cpu_state[1].monitor != NULL)
1630 initialize_adc(&cpu_state[1]);
1634 while (state == state_attached) {
1635 unsigned long elapsed, start;
1641 /* First, we always calculate the new DIMMs state on an Xserve */
1643 do_monitor_dimms(&dimms_state);
1645 /* Then, the CPUs */
1646 if (cpu_pid_type == CPU_PID_TYPE_COMBINED)
1647 do_monitor_cpu_combined();
1648 else if (cpu_pid_type == CPU_PID_TYPE_RACKMAC) {
1649 do_monitor_cpu_rack(&cpu_state[0]);
1650 if (cpu_state[1].monitor != NULL)
1651 do_monitor_cpu_rack(&cpu_state[1]);
1652 // better deal with UP
1654 do_monitor_cpu_split(&cpu_state[0]);
1655 if (cpu_state[1].monitor != NULL)
1656 do_monitor_cpu_split(&cpu_state[1]);
1657 // better deal with UP
1659 /* Then, the rest */
1660 do_monitor_backside(&backside_state);
1662 do_monitor_drives(&drives_state);
1665 if (critical_state == 1) {
1666 printk(KERN_WARNING "Temperature control detected a critical condition\n");
1667 printk(KERN_WARNING "Attempting to shut down...\n");
1668 if (call_critical_overtemp()) {
1669 printk(KERN_WARNING "Can't call %s, power off now!\n",
1670 critical_overtemp_path);
1671 machine_power_off();
1674 if (critical_state > 0)
1676 if (critical_state > MAX_CRITICAL_STATE) {
1677 printk(KERN_WARNING "Shutdown timed out, power off now !\n");
1678 machine_power_off();
1681 // FIXME: Deal with signals
1682 elapsed = jiffies - start;
1684 schedule_timeout_interruptible(HZ - elapsed);
1688 DBG("main_control_loop ended\n");
1691 complete_and_exit(&ctrl_complete, 0);
1695 * Dispose the control loops when tearing down
1697 static void dispose_control_loops(void)
1699 dispose_cpu_state(&cpu_state[0]);
1700 dispose_cpu_state(&cpu_state[1]);
1701 dispose_backside_state(&backside_state);
1702 dispose_drives_state(&drives_state);
1703 dispose_dimms_state(&dimms_state);
1707 * Create the control loops. U3-0 i2c bus is up, so we can now
1708 * get to the various sensors
1710 static int create_control_loops(void)
1712 struct device_node *np;
1714 /* Count CPUs from the device-tree, we don't care how many are
1715 * actually used by Linux
1718 for (np = NULL; NULL != (np = of_find_node_by_type(np, "cpu"));)
1721 DBG("counted %d CPUs in the device-tree\n", cpu_count);
1723 /* Decide the type of PID algorithm to use based on the presence of
1724 * the pumps, though that may not be the best way, that is good enough
1728 cpu_pid_type = CPU_PID_TYPE_RACKMAC;
1729 else if (machine_is_compatible("PowerMac7,3")
1731 && fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID
1732 && fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID) {
1733 printk(KERN_INFO "Liquid cooling pumps detected, using new algorithm !\n");
1734 cpu_pid_type = CPU_PID_TYPE_COMBINED;
1736 cpu_pid_type = CPU_PID_TYPE_SPLIT;
1738 /* Create control loops for everything. If any fail, everything
1741 if (init_cpu_state(&cpu_state[0], 0))
1743 if (cpu_pid_type == CPU_PID_TYPE_COMBINED)
1744 fetch_cpu_pumps_minmax();
1746 if (cpu_count > 1 && init_cpu_state(&cpu_state[1], 1))
1748 if (init_backside_state(&backside_state))
1750 if (rackmac && init_dimms_state(&dimms_state))
1752 if (!rackmac && init_drives_state(&drives_state))
1755 DBG("all control loops up !\n");
1760 DBG("failure creating control loops, disposing\n");
1762 dispose_control_loops();
1768 * Start the control loops after everything is up, that is create
1769 * the thread that will make them run
1771 static void start_control_loops(void)
1773 init_completion(&ctrl_complete);
1775 ctrl_task = kernel_thread(main_control_loop, NULL, SIGCHLD | CLONE_KERNEL);
1779 * Stop the control loops when tearing down
1781 static void stop_control_loops(void)
1784 wait_for_completion(&ctrl_complete);
1788 * Attach to the i2c FCU after detecting U3-1 bus
1790 static int attach_fcu(void)
1792 fcu = attach_i2c_chip(FAN_CTRLER_ID, "fcu");
1796 DBG("FCU attached\n");
1802 * Detach from the i2c FCU when tearing down
1804 static void detach_fcu(void)
1807 detach_i2c_chip(fcu);
1812 * Attach to the i2c controller. We probe the various chips based
1813 * on the device-tree nodes and build everything for the driver to
1814 * run, we then kick the driver monitoring thread
1816 static int therm_pm72_attach(struct i2c_adapter *adapter)
1821 if (state == state_detached)
1822 state = state_attaching;
1823 if (state != state_attaching) {
1828 /* Check if we are looking for one of these */
1829 if (u3_0 == NULL && !strcmp(adapter->name, "u3 0")) {
1831 DBG("found U3-0\n");
1833 if (create_control_loops())
1835 } else if (u3_1 == NULL && !strcmp(adapter->name, "u3 1")) {
1837 DBG("found U3-1, attaching FCU\n");
1840 } else if (k2 == NULL && !strcmp(adapter->name, "mac-io 0")) {
1843 if (u3_0 && rackmac)
1844 if (create_control_loops())
1847 /* We got all we need, start control loops */
1848 if (u3_0 != NULL && u3_1 != NULL && (k2 || !rackmac)) {
1849 DBG("everything up, starting control loops\n");
1850 state = state_attached;
1851 start_control_loops();
1859 * Called on every adapter when the driver or the i2c controller
1862 static int therm_pm72_detach(struct i2c_adapter *adapter)
1866 if (state != state_detached)
1867 state = state_detaching;
1869 /* Stop control loops if any */
1870 DBG("stopping control loops\n");
1872 stop_control_loops();
1875 if (u3_0 != NULL && !strcmp(adapter->name, "u3 0")) {
1876 DBG("lost U3-0, disposing control loops\n");
1877 dispose_control_loops();
1881 if (u3_1 != NULL && !strcmp(adapter->name, "u3 1")) {
1882 DBG("lost U3-1, detaching FCU\n");
1886 if (u3_0 == NULL && u3_1 == NULL)
1887 state = state_detached;
1894 static int fan_check_loc_match(const char *loc, int fan)
1899 strlcpy(tmp, fcu_fans[fan].loc, 64);
1906 if (strcmp(loc, c) == 0)
1915 static void fcu_lookup_fans(struct device_node *fcu_node)
1917 struct device_node *np = NULL;
1920 /* The table is filled by default with values that are suitable
1921 * for the old machines without device-tree informations. We scan
1922 * the device-tree and override those values with whatever is
1926 DBG("Looking up FCU controls in device-tree...\n");
1928 while ((np = of_get_next_child(fcu_node, np)) != NULL) {
1933 DBG(" control: %s, type: %s\n", np->name, np->type);
1935 /* Detect control type */
1936 if (!strcmp(np->type, "fan-rpm-control") ||
1937 !strcmp(np->type, "fan-rpm"))
1939 if (!strcmp(np->type, "fan-pwm-control") ||
1940 !strcmp(np->type, "fan-pwm"))
1942 /* Only care about fans for now */
1946 /* Lookup for a matching location */
1947 loc = (char *)get_property(np, "location", NULL);
1948 reg = (u32 *)get_property(np, "reg", NULL);
1949 if (loc == NULL || reg == NULL)
1951 DBG(" matching location: %s, reg: 0x%08x\n", loc, *reg);
1953 for (i = 0; i < FCU_FAN_COUNT; i++) {
1956 if (!fan_check_loc_match(loc, i))
1958 DBG(" location match, index: %d\n", i);
1959 fcu_fans[i].id = FCU_FAN_ABSENT_ID;
1960 if (type != fcu_fans[i].type) {
1961 printk(KERN_WARNING "therm_pm72: Fan type mismatch "
1962 "in device-tree for %s\n", np->full_name);
1965 if (type == FCU_FAN_RPM)
1966 fan_id = ((*reg) - 0x10) / 2;
1968 fan_id = ((*reg) - 0x30) / 2;
1970 printk(KERN_WARNING "therm_pm72: Can't parse "
1971 "fan ID in device-tree for %s\n", np->full_name);
1974 DBG(" fan id -> %d, type -> %d\n", fan_id, type);
1975 fcu_fans[i].id = fan_id;
1979 /* Now dump the array */
1980 printk(KERN_INFO "Detected fan controls:\n");
1981 for (i = 0; i < FCU_FAN_COUNT; i++) {
1982 if (fcu_fans[i].id == FCU_FAN_ABSENT_ID)
1984 printk(KERN_INFO " %d: %s fan, id %d, location: %s\n", i,
1985 fcu_fans[i].type == FCU_FAN_RPM ? "RPM" : "PWM",
1986 fcu_fans[i].id, fcu_fans[i].loc);
1990 static int fcu_of_probe(struct of_device* dev, const struct of_device_id *match)
1994 state = state_detached;
1996 /* Lookup the fans in the device tree */
1997 fcu_lookup_fans(dev->node);
1999 /* Add the driver */
2000 rc = i2c_add_driver(&therm_pm72_driver);
2006 static int fcu_of_remove(struct of_device* dev)
2008 i2c_del_driver(&therm_pm72_driver);
2013 static struct of_device_id fcu_match[] =
2021 static struct of_platform_driver fcu_of_platform_driver =
2023 .name = "temperature",
2024 .match_table = fcu_match,
2025 .probe = fcu_of_probe,
2026 .remove = fcu_of_remove
2030 * Check machine type, attach to i2c controller
2032 static int __init therm_pm72_init(void)
2034 struct device_node *np;
2036 rackmac = machine_is_compatible("RackMac3,1");
2038 if (!machine_is_compatible("PowerMac7,2") &&
2039 !machine_is_compatible("PowerMac7,3") &&
2043 printk(KERN_INFO "PowerMac G5 Thermal control driver %s\n", VERSION);
2045 np = of_find_node_by_type(NULL, "fcu");
2047 /* Some machines have strangely broken device-tree */
2048 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
2050 printk(KERN_ERR "Can't find FCU in device-tree !\n");
2054 of_dev = of_platform_device_create(np, "temperature", NULL);
2055 if (of_dev == NULL) {
2056 printk(KERN_ERR "Can't register FCU platform device !\n");
2060 of_register_driver(&fcu_of_platform_driver);
2065 static void __exit therm_pm72_exit(void)
2067 of_unregister_driver(&fcu_of_platform_driver);
2070 of_device_unregister(of_dev);
2073 module_init(therm_pm72_init);
2074 module_exit(therm_pm72_exit);
2076 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
2077 MODULE_DESCRIPTION("Driver for Apple's PowerMac G5 thermal control");
2078 MODULE_LICENSE("GPL");