/* * Device driver for the thermostats & fan controller of the * Apple G5 "PowerMac7,2" desktop machines. * * (c) Copyright IBM Corp. 2003-2004 * * Maintained by: Benjamin Herrenschmidt * <benh@kernel.crashing.org> * * * The algorithm used is the PID control algorithm, used the same * way the published Darwin code does, using the same values that * are present in the Darwin 7.0 snapshot property lists. * * As far as the CPUs control loops are concerned, I use the * calibration & PID constants provided by the EEPROM, * I do _not_ embed any value from the property lists, as the ones * provided by Darwin 7.0 seem to always have an older version that * what I've seen on the actual computers. * It would be interesting to verify that though. Darwin has a * version code of 1.0.0d11 for all control loops it seems, while * so far, the machines EEPROMs contain a dataset versioned 1.0.0f * * Darwin doesn't provide source to all parts, some missing * bits like the AppleFCU driver or the actual scale of some * of the values returned by sensors had to be "guessed" some * way... or based on what Open Firmware does. * * I didn't yet figure out how to get the slots power consumption * out of the FCU, so that part has not been implemented yet and * the slots fan is set to a fixed 50% PWM, hoping this value is * safe enough ... * * Note: I have observed strange oscillations of the CPU control * loop on a dual G5 here. When idle, the CPU exhaust fan tend to * oscillates slowly (over several minutes) between the minimum * of 300RPMs and approx. 1000 RPMs. I don't know what is causing * this, it could be some incorrect constant or an error in the * way I ported the algorithm, or it could be just normal. I * don't have full understanding on the way Apple tweaked the PID * algorithm for the CPU control, it is definitely not a standard * implementation... * * TODO: - Check MPU structure version/signature * - Add things like /sbin/overtemp for non-critical * overtemp conditions so userland can take some policy * decisions, like slowing down CPUs * - Deal with fan and i2c failures in a better way * - Maybe do a generic PID based on params used for * U3 and Drives ? Definitely need to factor code a bit * better... also make sensor detection more robust using * the device-tree to probe for them * - Figure out how to get the slots consumption and set the * slots fan accordingly * * History: * * Nov. 13, 2003 : 0.5 * - First release * * Nov. 14, 2003 : 0.6 * - Read fan speed from FCU, low level fan routines now deal * with errors & check fan status, though higher level don't * do much. * - Move a bunch of definitions to .h file * * Nov. 18, 2003 : 0.7 * - Fix build on ppc64 kernel * - Move back statics definitions to .c file * - Avoid calling schedule_timeout with a negative number * * Dec. 18, 2003 : 0.8 * - Fix typo when reading back fan speed on 2 CPU machines * * Mar. 11, 2004 : 0.9 * - Rework code accessing the ADC chips, make it more robust and * closer to the chip spec. Also make sure it is configured properly, * I've seen yet unexplained cases where on startup, I would have stale * values in the configuration register * - Switch back to use of target fan speed for PID, thus lowering * pressure on i2c * * Oct. 20, 2004 : 1.1 * - Add device-tree lookup for fan IDs, should detect liquid cooling * pumps when present * - Enable driver for PowerMac7,3 machines * - Split the U3/Backside cooling on U3 & U3H versions as Darwin does * - Add new CPU cooling algorithm for machines with liquid cooling * - Workaround for some PowerMac7,3 with empty "fan" node in the devtree * - Fix a signed/unsigned compare issue in some PID loops * * Mar. 10, 2005 : 1.2 * - Add basic support for Xserve G5 * - Retrieve pumps min/max from EEPROM image in device-tree (broken) * - Use min/max macros here or there * - Latest darwin updated U3H min fan speed to 20% PWM * * July. 06, 2006 : 1.3 * - Fix setting of RPM fans on Xserve G5 (they were going too fast) * - Add missing slots fan control loop for Xserve G5 * - Lower fixed slots fan speed from 50% to 40% on desktop G5s. We * still can't properly implement the control loop for these, so let's * reduce the noise a little bit, it appears that 40% still gives us * a pretty good air flow * - Add code to "tickle" the FCU regulary so it doesn't think that * we are gone while in fact, the machine just didn't need any fan * speed change lately * */ #include <linux/types.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/sched.h> #include <linux/init.h> #include <linux/spinlock.h> #include <linux/wait.h> #include <linux/reboot.h> #include <linux/kmod.h> #include <linux/i2c.h> #include <linux/kthread.h> #include <linux/mutex.h> #include <linux/of_device.h> #include <linux/of_platform.h> #include <asm/prom.h> #include <asm/machdep.h> #include <asm/io.h> #include <asm/system.h> #include <asm/sections.h> #include <asm/macio.h> #include "therm_pm72.h" #define VERSION "1.3" #undef DEBUG #ifdef DEBUG #define DBG(args...) printk(args) #else #define DBG(args...) do { } while(0) #endif /* * Driver statics */ static struct platform_device * of_dev; static struct i2c_adapter * u3_0; static struct i2c_adapter * u3_1; static struct i2c_adapter * k2; static struct i2c_client * fcu; static struct cpu_pid_state processor_state[2]; static struct basckside_pid_params backside_params; static struct backside_pid_state backside_state; static struct drives_pid_state drives_state; static struct dimm_pid_state dimms_state; static struct slots_pid_state slots_state; static int state; static int cpu_count; static int cpu_pid_type; static struct task_struct *ctrl_task; static struct completion ctrl_complete; static int critical_state; static int rackmac; static s32 dimm_output_clamp; static int fcu_rpm_shift; static int fcu_tickle_ticks; static DEFINE_MUTEX(driver_lock); /* * We have 3 types of CPU PID control. One is "split" old style control * for intake & exhaust fans, the other is "combined" control for both * CPUs that also deals with the pumps when present. To be "compatible" * with OS X at this point, we only use "COMBINED" on the machines that * are identified as having the pumps (though that identification is at * least dodgy). Ultimately, we could probably switch completely to this * algorithm provided we hack it to deal with the UP case */ #define CPU_PID_TYPE_SPLIT 0 #define CPU_PID_TYPE_COMBINED 1 #define CPU_PID_TYPE_RACKMAC 2 /* * This table describes all fans in the FCU. The "id" and "type" values * are defaults valid for all earlier machines. Newer machines will * eventually override the table content based on the device-tree */ struct fcu_fan_table { char* loc; /* location code */ int type; /* 0 = rpm, 1 = pwm, 2 = pump */ int id; /* id or -1 */ }; #define FCU_FAN_RPM 0 #define FCU_FAN_PWM 1 #define FCU_FAN_ABSENT_ID -1 #define FCU_FAN_COUNT ARRAY_SIZE(fcu_fans) struct fcu_fan_table fcu_fans[] = { [BACKSIDE_FAN_PWM_INDEX] = { .loc = "BACKSIDE,SYS CTRLR FAN", .type = FCU_FAN_PWM, .id = BACKSIDE_FAN_PWM_DEFAULT_ID, }, [DRIVES_FAN_RPM_INDEX] = { .loc = "DRIVE BAY", .type = FCU_FAN_RPM, .id = DRIVES_FAN_RPM_DEFAULT_ID, }, [SLOTS_FAN_PWM_INDEX] = { .loc = "SLOT,PCI FAN", .type = FCU_FAN_PWM, .id = SLOTS_FAN_PWM_DEFAULT_ID, }, [CPUA_INTAKE_FAN_RPM_INDEX] = { .loc = "CPU A INTAKE", .type = FCU_FAN_RPM, .id = CPUA_INTAKE_FAN_RPM_DEFAULT_ID, }, [CPUA_EXHAUST_FAN_RPM_INDEX] = { .loc = "CPU A EXHAUST", .type = FCU_FAN_RPM, .id = CPUA_EXHAUST_FAN_RPM_DEFAULT_ID, }, [CPUB_INTAKE_FAN_RPM_INDEX] = { .loc = "CPU B INTAKE", .type = FCU_FAN_RPM, .id = CPUB_INTAKE_FAN_RPM_DEFAULT_ID, }, [CPUB_EXHAUST_FAN_RPM_INDEX] = { .loc = "CPU B EXHAUST", .type = FCU_FAN_RPM, .id = CPUB_EXHAUST_FAN_RPM_DEFAULT_ID, }, /* pumps aren't present by default, have to be looked up in the * device-tree */ [CPUA_PUMP_RPM_INDEX] = { .loc = "CPU A PUMP", .type = FCU_FAN_RPM, .id = FCU_FAN_ABSENT_ID, }, [CPUB_PUMP_RPM_INDEX] = { .loc = "CPU B PUMP", .type = FCU_FAN_RPM, .id = FCU_FAN_ABSENT_ID, }, /* Xserve fans */ [CPU_A1_FAN_RPM_INDEX] = { .loc = "CPU A 1", .type = FCU_FAN_RPM, .id = FCU_FAN_ABSENT_ID, }, [CPU_A2_FAN_RPM_INDEX] = { .loc = "CPU A 2", .type = FCU_FAN_RPM, .id = FCU_FAN_ABSENT_ID, }, [CPU_A3_FAN_RPM_INDEX] = { .loc = "CPU A 3", .type = FCU_FAN_RPM, .id = FCU_FAN_ABSENT_ID, }, [CPU_B1_FAN_RPM_INDEX] = { .loc = "CPU B 1", .type = FCU_FAN_RPM, .id = FCU_FAN_ABSENT_ID, }, [CPU_B2_FAN_RPM_INDEX] = { .loc = "CPU B 2", .type = FCU_FAN_RPM, .id = FCU_FAN_ABSENT_ID, }, [CPU_B3_FAN_RPM_INDEX] = { .loc = "CPU B 3", .type = FCU_FAN_RPM, .id = FCU_FAN_ABSENT_ID, }, }; static struct i2c_driver therm_pm72_driver; /* * Utility function to create an i2c_client structure and * attach it to one of u3 adapters */ static struct i2c_client *attach_i2c_chip(int id, const char *name) { struct i2c_client *clt; struct i2c_adapter *adap; struct i2c_board_info info; if (id & 0x200) adap = k2; else if (id & 0x100) adap = u3_1; else adap = u3_0; if (adap == NULL) return NULL; memset(&info, 0, sizeof(struct i2c_board_info)); info.addr = (id >> 1) & 0x7f; strlcpy(info.type, "therm_pm72", I2C_NAME_SIZE); clt = i2c_new_device(adap, &info); if (!clt) { printk(KERN_ERR "therm_pm72: Failed to attach to i2c ID 0x%x\n", id); return NULL; } /* * Let i2c-core delete that device on driver removal. * This is safe because i2c-core holds the core_lock mutex for us. */ list_add_tail(&clt->detected, &therm_pm72_driver.clients); return clt; } /* * Here are the i2c chip access wrappers */ static void initialize_adc(struct cpu_pid_state *state) { int rc; u8 buf[2]; /* Read ADC the configuration register and cache it. We * also make sure Config2 contains proper values, I've seen * cases where we got stale grabage in there, thus preventing * proper reading of conv. values */ /* Clear Config2 */ buf[0] = 5; buf[1] = 0; i2c_master_send(state->monitor, buf, 2); /* Read & cache Config1 */ buf[0] = 1; rc = i2c_master_send(state->monitor, buf, 1); if (rc > 0) { rc = i2c_master_recv(state->monitor, buf, 1); if (rc > 0) { state->adc_config = buf[0]; DBG("ADC config reg: %02x\n", state->adc_config); /* Disable shutdown mode */ state->adc_config &= 0xfe; buf[0] = 1; buf[1] = state->adc_config; rc = i2c_master_send(state->monitor, buf, 2); } } if (rc <= 0) printk(KERN_ERR "therm_pm72: Error reading ADC config" " register !\n"); } static int read_smon_adc(struct cpu_pid_state *state, int chan) { int rc, data, tries = 0; u8 buf[2]; for (;;) { /* Set channel */ buf[0] = 1; buf[1] = (state->adc_config & 0x1f) | (chan << 5); rc = i2c_master_send(state->monitor, buf, 2); if (rc <= 0) goto error; /* Wait for conversion */ msleep(1); /* Switch to data register */ buf[0] = 4; rc = i2c_master_send(state->monitor, buf, 1); if (rc <= 0) goto error; /* Read result */ rc = i2c_master_recv(state->monitor, buf, 2); if (rc < 0) goto error; data = ((u16)buf[0]) << 8 | (u16)buf[1]; return data >> 6; error: DBG("Error reading ADC, retrying...\n"); if (++tries > 10) { printk(KERN_ERR "therm_pm72: Error reading ADC !\n"); return -1; } msleep(10); } } static int read_lm87_reg(struct i2c_client * chip, int reg) { int rc, tries = 0; u8 buf; for (;;) { /* Set address */ buf = (u8)reg; rc = i2c_master_send(chip, &buf, 1); if (rc <= 0) goto error; rc = i2c_master_recv(chip, &buf, 1); if (rc <= 0) goto error; return (int)buf; error: DBG("Error reading LM87, retrying...\n"); if (++tries > 10) { printk(KERN_ERR "therm_pm72: Error reading LM87 !\n"); return -1; } msleep(10); } } static int fan_read_reg(int reg, unsigned char *buf, int nb) { int tries, nr, nw; buf[0] = reg; tries = 0; for (;;) { nw = i2c_master_send(fcu, buf, 1); if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100) break; msleep(10); ++tries; } if (nw <= 0) { printk(KERN_ERR "Failure writing address to FCU: %d", nw); return -EIO; } tries = 0; for (;;) { nr = i2c_master_recv(fcu, buf, nb); if (nr > 0 || (nr < 0 && nr != -ENODEV) || tries >= 100) break; msleep(10); ++tries; } if (nr <= 0) printk(KERN_ERR "Failure reading data from FCU: %d", nw); return nr; } static int fan_write_reg(int reg, const unsigned char *ptr, int nb) { int tries, nw; unsigned char buf[16]; buf[0] = reg; memcpy(buf+1, ptr, nb); ++nb; tries = 0; for (;;) { nw = i2c_master_send(fcu, buf, nb); if (nw > 0 || (nw < 0 && nw != -EIO) || tries >= 100) break; msleep(10); ++tries; } if (nw < 0) printk(KERN_ERR "Failure writing to FCU: %d", nw); return nw; } static int start_fcu(void) { unsigned char buf = 0xff; int rc; rc = fan_write_reg(0xe, &buf, 1); if (rc < 0) return -EIO; rc = fan_write_reg(0x2e, &buf, 1); if (rc < 0) return -EIO; rc = fan_read_reg(0, &buf, 1); if (rc < 0) return -EIO; fcu_rpm_shift = (buf == 1) ? 2 : 3; printk(KERN_DEBUG "FCU Initialized, RPM fan shift is %d\n", fcu_rpm_shift); return 0; } static int set_rpm_fan(int fan_index, int rpm) { unsigned char buf[2]; int rc, id, min, max; if (fcu_fans[fan_index].type != FCU_FAN_RPM) return -EINVAL; id = fcu_fans[fan_index].id; if (id == FCU_FAN_ABSENT_ID) return -EINVAL; min = 2400 >> fcu_rpm_shift; max = 56000 >> fcu_rpm_shift; if (rpm < min) rpm = min; else if (rpm > max) rpm = max; buf[0] = rpm >> (8 - fcu_rpm_shift); buf[1] = rpm << fcu_rpm_shift; rc = fan_write_reg(0x10 + (id * 2), buf, 2); if (rc < 0) return -EIO; return 0; } static int get_rpm_fan(int fan_index, int programmed) { unsigned char failure; unsigned char active; unsigned char buf[2]; int rc, id, reg_base; if (fcu_fans[fan_index].type != FCU_FAN_RPM) return -EINVAL; id = fcu_fans[fan_index].id; if (id == FCU_FAN_ABSENT_ID) return -EINVAL; rc = fan_read_reg(0xb, &failure, 1); if (rc != 1) return -EIO; if ((failure & (1 << id)) != 0) return -EFAULT; rc = fan_read_reg(0xd, &active, 1); if (rc != 1) return -EIO; if ((active & (1 << id)) == 0) return -ENXIO; /* Programmed value or real current speed */ reg_base = programmed ? 0x10 : 0x11; rc = fan_read_reg(reg_base + (id * 2), buf, 2); if (rc != 2) return -EIO; return (buf[0] << (8 - fcu_rpm_shift)) | buf[1] >> fcu_rpm_shift; } static int set_pwm_fan(int fan_index, int pwm) { unsigned char buf[2]; int rc, id; if (fcu_fans[fan_index].type != FCU_FAN_PWM) return -EINVAL; id = fcu_fans[fan_index].id; if (id == FCU_FAN_ABSENT_ID) return -EINVAL; if (pwm < 10) pwm = 10; else if (pwm > 100) pwm = 100; pwm = (pwm * 2559) / 1000; buf[0] = pwm; rc = fan_write_reg(0x30 + (id * 2), buf, 1); if (rc < 0) return rc; return 0; } static int get_pwm_fan(int fan_index) { unsigned char failure; unsigned char active; unsigned char buf[2]; int rc, id; if (fcu_fans[fan_index].type != FCU_FAN_PWM) return -EINVAL; id = fcu_fans[fan_index].id; if (id == FCU_FAN_ABSENT_ID) return -EINVAL; rc = fan_read_reg(0x2b, &failure, 1); if (rc != 1) return -EIO; if ((failure & (1 << id)) != 0) return -EFAULT; rc = fan_read_reg(0x2d, &active, 1); if (rc != 1) return -EIO; if ((active & (1 << id)) == 0) return -ENXIO; /* Programmed value or real current speed */ rc = fan_read_reg(0x30 + (id * 2), buf, 1); if (rc != 1) return -EIO; return (buf[0] * 1000) / 2559; } static void tickle_fcu(void) { int pwm; pwm = get_pwm_fan(SLOTS_FAN_PWM_INDEX); DBG("FCU Tickle, slots fan is: %d\n", pwm); if (pwm < 0) pwm = 100; if (!rackmac) { pwm = SLOTS_FAN_DEFAULT_PWM; } else if (pwm < SLOTS_PID_OUTPUT_MIN) pwm = SLOTS_PID_OUTPUT_MIN; /* That is hopefully enough to make the FCU happy */ set_pwm_fan(SLOTS_FAN_PWM_INDEX, pwm); } /* * Utility routine to read the CPU calibration EEPROM data * from the device-tree */ static int read_eeprom(int cpu, struct mpu_data *out) { struct device_node *np; char nodename[64]; const u8 *data; int len; /* prom.c routine for finding a node by path is a bit brain dead * and requires exact @xxx unit numbers. This is a bit ugly but * will work for these machines */ sprintf(nodename, "/u3@0,f8000000/i2c@f8001000/cpuid@a%d", cpu ? 2 : 0); np = of_find_node_by_path(nodename); if (np == NULL) { printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid node from device-tree\n"); return -ENODEV; } data = of_get_property(np, "cpuid", &len); if (data == NULL) { printk(KERN_ERR "therm_pm72: Failed to retrieve cpuid property from device-tree\n"); of_node_put(np); return -ENODEV; } memcpy(out, data, sizeof(struct mpu_data)); of_node_put(np); return 0; } static void fetch_cpu_pumps_minmax(void) { struct cpu_pid_state *state0 = &processor_state[0]; struct cpu_pid_state *state1 = &processor_state[1]; u16 pump_min = 0, pump_max = 0xffff; u16 tmp[4]; /* Try to fetch pumps min/max infos from eeprom */ memcpy(&tmp, &state0->mpu.processor_part_num, 8); if (tmp[0] != 0xffff && tmp[1] != 0xffff) { pump_min = max(pump_min, tmp[0]); pump_max = min(pump_max, tmp[1]); } if (tmp[2] != 0xffff && tmp[3] != 0xffff) { pump_min = max(pump_min, tmp[2]); pump_max = min(pump_max, tmp[3]); } /* Double check the values, this _IS_ needed as the EEPROM on * some dual 2.5Ghz G5s seem, at least, to have both min & max * same to the same value ... (grrrr) */ if (pump_min == pump_max || pump_min == 0 || pump_max == 0xffff) { pump_min = CPU_PUMP_OUTPUT_MIN; pump_max = CPU_PUMP_OUTPUT_MAX; } state0->pump_min = state1->pump_min = pump_min; state0->pump_max = state1->pump_max = pump_max; } /* * Now, unfortunately, sysfs doesn't give us a nice void * we could * pass around to the attribute functions, so we don't really have * choice but implement a bunch of them... * * That sucks a bit, we take the lock because FIX32TOPRINT evaluates * the input twice... I accept patches :) */ #define BUILD_SHOW_FUNC_FIX(name, data) \ static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ { \ ssize_t r; \ mutex_lock(&driver_lock); \ r = sprintf(buf, "%d.%03d", FIX32TOPRINT(data)); \ mutex_unlock(&driver_lock); \ return r; \ } #define BUILD_SHOW_FUNC_INT(name, data) \ static ssize_t show_##name(struct device *dev, struct device_attribute *attr, char *buf) \ { \ return sprintf(buf, "%d", data); \ } BUILD_SHOW_FUNC_FIX(cpu0_temperature, processor_state[0].last_temp) BUILD_SHOW_FUNC_FIX(cpu0_voltage, processor_state[0].voltage) BUILD_SHOW_FUNC_FIX(cpu0_current, processor_state[0].current_a) BUILD_SHOW_FUNC_INT(cpu0_exhaust_fan_rpm, processor_state[0].rpm) BUILD_SHOW_FUNC_INT(cpu0_intake_fan_rpm, processor_state[0].intake_rpm) BUILD_SHOW_FUNC_FIX(cpu1_temperature, processor_state[1].last_temp) BUILD_SHOW_FUNC_FIX(cpu1_voltage, processor_state[1].voltage) BUILD_SHOW_FUNC_FIX(cpu1_current, processor_state[1].current_a) BUILD_SHOW_FUNC_INT(cpu1_exhaust_fan_rpm, processor_state[1].rpm) BUILD_SHOW_FUNC_INT(cpu1_intake_fan_rpm, processor_state[1].intake_rpm) BUILD_SHOW_FUNC_FIX(backside_temperature, backside_state.last_temp) BUILD_SHOW_FUNC_INT(backside_fan_pwm, backside_state.pwm) BUILD_SHOW_FUNC_FIX(drives_temperature, drives_state.last_temp) BUILD_SHOW_FUNC_INT(drives_fan_rpm, drives_state.rpm) BUILD_SHOW_FUNC_FIX(slots_temperature, slots_state.last_temp) BUILD_SHOW_FUNC_INT(slots_fan_pwm, slots_state.pwm) BUILD_SHOW_FUNC_FIX(dimms_temperature, dimms_state.last_temp) static DEVICE_ATTR(cpu0_temperature,S_IRUGO,show_cpu0_temperature,NULL); static DEVICE_ATTR(cpu0_voltage,S_IRUGO,show_cpu0_voltage,NULL); static DEVICE_ATTR(cpu0_current,S_IRUGO,show_cpu0_current,NULL); static DEVICE_ATTR(cpu0_exhaust_fan_rpm,S_IRUGO,show_cpu0_exhaust_fan_rpm,NULL); static DEVICE_ATTR(cpu0_intake_fan_rpm,S_IRUGO,show_cpu0_intake_fan_rpm,NULL); static DEVICE_ATTR(cpu1_temperature,S_IRUGO,show_cpu1_temperature,NULL); static DEVICE_ATTR(cpu1_voltage,S_IRUGO,show_cpu1_voltage,NULL); static DEVICE_ATTR(cpu1_current,S_IRUGO,show_cpu1_current,NULL); static DEVICE_ATTR(cpu1_exhaust_fan_rpm,S_IRUGO,show_cpu1_exhaust_fan_rpm,NULL); static DEVICE_ATTR(cpu1_intake_fan_rpm,S_IRUGO,show_cpu1_intake_fan_rpm,NULL); static DEVICE_ATTR(backside_temperature,S_IRUGO,show_backside_temperature,NULL); static DEVICE_ATTR(backside_fan_pwm,S_IRUGO,show_backside_fan_pwm,NULL); static DEVICE_ATTR(drives_temperature,S_IRUGO,show_drives_temperature,NULL); static DEVICE_ATTR(drives_fan_rpm,S_IRUGO,show_drives_fan_rpm,NULL); static DEVICE_ATTR(slots_temperature,S_IRUGO,show_slots_temperature,NULL); static DEVICE_ATTR(slots_fan_pwm,S_IRUGO,show_slots_fan_pwm,NULL); static DEVICE_ATTR(dimms_temperature,S_IRUGO,show_dimms_temperature,NULL); /* * CPUs fans control loop */ static int do_read_one_cpu_values(struct cpu_pid_state *state, s32 *temp, s32 *power) { s32 ltemp, volts, amps; int index, rc = 0; /* Default (in case of error) */ *temp = state->cur_temp; *power = state->cur_power; if (cpu_pid_type == CPU_PID_TYPE_RACKMAC) index = (state->index == 0) ? CPU_A1_FAN_RPM_INDEX : CPU_B1_FAN_RPM_INDEX; else index = (state->index == 0) ? CPUA_EXHAUST_FAN_RPM_INDEX : CPUB_EXHAUST_FAN_RPM_INDEX; /* Read current fan status */ rc = get_rpm_fan(index, !RPM_PID_USE_ACTUAL_SPEED); if (rc < 0) { /* XXX What do we do now ? Nothing for now, keep old value, but * return error upstream */ DBG(" cpu %d, fan reading error !\n", state->index); } else { state->rpm = rc; DBG(" cpu %d, exhaust RPM: %d\n", state->index, state->rpm); } /* Get some sensor readings and scale it */ ltemp = read_smon_adc(state, 1); if (ltemp == -1) { /* XXX What do we do now ? */ state->overtemp++; if (rc == 0) rc = -EIO; DBG(" cpu %d, temp reading error !\n", state->index); } else { /* Fixup temperature according to diode calibration */ DBG(" cpu %d, temp raw: %04x, m_diode: %04x, b_diode: %04x\n", state->index, ltemp, state->mpu.mdiode, state->mpu.bdiode); *temp = ((s32)ltemp * (s32)state->mpu.mdiode + ((s32)state->mpu.bdiode << 12)) >> 2; state->last_temp = *temp; DBG(" temp: %d.%03d\n", FIX32TOPRINT((*temp))); } /* * Read voltage & current and calculate power */ volts = read_smon_adc(state, 3); amps = read_smon_adc(state, 4); /* Scale voltage and current raw sensor values according to fixed scales * obtained in Darwin and calculate power from I and V */ volts *= ADC_CPU_VOLTAGE_SCALE; amps *= ADC_CPU_CURRENT_SCALE; *power = (((u64)volts) * ((u64)amps)) >> 16; state->voltage = volts; state->current_a = amps; state->last_power = *power; DBG(" cpu %d, current: %d.%03d, voltage: %d.%03d, power: %d.%03d W\n", state->index, FIX32TOPRINT(state->current_a), FIX32TOPRINT(state->voltage), FIX32TOPRINT(*power)); return 0; } static void do_cpu_pid(struct cpu_pid_state *state, s32 temp, s32 power) { s32 power_target, integral, derivative, proportional, adj_in_target, sval; s64 integ_p, deriv_p, prop_p, sum; int i; /* Calculate power target value (could be done once for all) * and convert to a 16.16 fp number */ power_target = ((u32)(state->mpu.pmaxh - state->mpu.padjmax)) << 16; DBG(" power target: %d.%03d, error: %d.%03d\n", FIX32TOPRINT(power_target), FIX32TOPRINT(power_target - power)); /* Store temperature and power in history array */ state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE; state->temp_history[state->cur_temp] = temp; state->cur_power = (state->cur_power + 1) % state->count_power; state->power_history[state->cur_power] = power; state->error_history[state->cur_power] = power_target - power; /* If first loop, fill the history table */ if (state->first) { for (i = 0; i < (state->count_power - 1); i++) { state->cur_power = (state->cur_power + 1) % state->count_power; state->power_history[state->cur_power] = power; state->error_history[state->cur_power] = power_target - power; } for (i = 0; i < (CPU_TEMP_HISTORY_SIZE - 1); i++) { state->cur_temp = (state->cur_temp + 1) % CPU_TEMP_HISTORY_SIZE; state->temp_history[state->cur_temp] = temp; } state->first = 0; } /* Calculate the integral term normally based on the "power" values */ sum = 0; integral = 0; for (i = 0; i < state->count_power; i++) integral += state->error_history[i]; integral *= CPU_PID_INTERVAL; DBG(" integral: %08x\n", integral); /* Calculate the adjusted input (sense value). * G_r is 12.20 * integ is 16.16 * so the result is 28.36 * * input target is mpu.ttarget, input max is mpu.tmax */ integ_p = ((s64)state->mpu.pid_gr) * (s64)integral; DBG(" integ_p: %d\n", (int)(integ_p >> 36)); sval = (state->mpu.tmax << 16) - ((integ_p >> 20) & 0xffffffff); adj_in_target = (state->mpu.ttarget << 16); if (adj_in_target > sval) adj_in_target = sval; DBG(" adj_in_target: %d.%03d, ttarget: %d\n", FIX32TOPRINT(adj_in_target), state->mpu.ttarget); /* Calculate the derivative term */ derivative = state->temp_history[state->cur_temp] - state->temp_history[(state->cur_temp + CPU_TEMP_HISTORY_SIZE - 1) % CPU_TEMP_HISTORY_SIZE]; derivative /= CPU_PID_INTERVAL; deriv_p = ((s64)state->mpu.pid_gd) * (s64)derivative; DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); sum += deriv_p; /* Calculate the proportional term */ proportional = temp - adj_in_target; prop_p = ((s64)state->mpu.pid_gp) * (s64)proportional; DBG(" prop_p: %d\n", (int)(prop_p >> 36)); sum += prop_p; /* Scale sum */ sum >>= 36; DBG(" sum: %d\n", (int)sum); state->rpm += (s32)sum; } static void do_monitor_cpu_combined(void) { struct cpu_pid_state *state0 = &processor_state[0]; struct cpu_pid_state *state1 = &processor_state[1]; s32 temp0, power0, temp1, power1; s32 temp_combi, power_combi; int rc, intake, pump; rc = do_read_one_cpu_values(state0, &temp0, &power0); if (rc < 0) { /* XXX What do we do now ? */ } state1->overtemp = 0; rc = do_read_one_cpu_values(state1, &temp1, &power1); if (rc < 0) { /* XXX What do we do now ? */ } if (state1->overtemp) state0->overtemp++; temp_combi = max(temp0, temp1); power_combi = max(power0, power1); /* Check tmax, increment overtemp if we are there. At tmax+8, we go * full blown immediately and try to trigger a shutdown */ if (temp_combi >= ((state0->mpu.tmax + 8) << 16)) { printk(KERN_WARNING "Warning ! Temperature way above maximum (%d) !\n", temp_combi >> 16); state0->overtemp += CPU_MAX_OVERTEMP / 4; } else if (temp_combi > (state0->mpu.tmax << 16)) { state0->overtemp++; printk(KERN_WARNING "Temperature %d above max %d. overtemp %d\n", temp_combi >> 16, state0->mpu.tmax, state0->overtemp); } else { if (state0->overtemp) printk(KERN_WARNING "Temperature back down to %d\n", temp_combi >> 16); state0->overtemp = 0; } if (state0->overtemp >= CPU_MAX_OVERTEMP) critical_state = 1; if (state0->overtemp > 0) { state0->rpm = state0->mpu.rmaxn_exhaust_fan; state0->intake_rpm = intake = state0->mpu.rmaxn_intake_fan; pump = state0->pump_max; goto do_set_fans; } /* Do the PID */ do_cpu_pid(state0, temp_combi, power_combi); /* Range check */ state0->rpm = max(state0->rpm, (int)state0->mpu.rminn_exhaust_fan); state0->rpm = min(state0->rpm, (int)state0->mpu.rmaxn_exhaust_fan); /* Calculate intake fan speed */ intake = (state0->rpm * CPU_INTAKE_SCALE) >> 16; intake = max(intake, (int)state0->mpu.rminn_intake_fan); intake = min(intake, (int)state0->mpu.rmaxn_intake_fan); state0->intake_rpm = intake; /* Calculate pump speed */ pump = (state0->rpm * state0->pump_max) / state0->mpu.rmaxn_exhaust_fan; pump = min(pump, state0->pump_max); pump = max(pump, state0->pump_min); do_set_fans: /* We copy values from state 0 to state 1 for /sysfs */ state1->rpm = state0->rpm; state1->intake_rpm = state0->intake_rpm; DBG("** CPU %d RPM: %d Ex, %d, Pump: %d, In, overtemp: %d\n", state1->index, (int)state1->rpm, intake, pump, state1->overtemp); /* We should check for errors, shouldn't we ? But then, what * do we do once the error occurs ? For FCU notified fan * failures (-EFAULT) we probably want to notify userland * some way... */ set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake); set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state0->rpm); set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake); set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state0->rpm); if (fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID) set_rpm_fan(CPUA_PUMP_RPM_INDEX, pump); if (fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID) set_rpm_fan(CPUB_PUMP_RPM_INDEX, pump); } static void do_monitor_cpu_split(struct cpu_pid_state *state) { s32 temp, power; int rc, intake; /* Read current fan status */ rc = do_read_one_cpu_values(state, &temp, &power); if (rc < 0) { /* XXX What do we do now ? */ } /* Check tmax, increment overtemp if we are there. At tmax+8, we go * full blown immediately and try to trigger a shutdown */ if (temp >= ((state->mpu.tmax + 8) << 16)) { printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum" " (%d) !\n", state->index, temp >> 16); state->overtemp += CPU_MAX_OVERTEMP / 4; } else if (temp > (state->mpu.tmax << 16)) { state->overtemp++; printk(KERN_WARNING "CPU %d temperature %d above max %d. overtemp %d\n", state->index, temp >> 16, state->mpu.tmax, state->overtemp); } else { if (state->overtemp) printk(KERN_WARNING "CPU %d temperature back down to %d\n", state->index, temp >> 16); state->overtemp = 0; } if (state->overtemp >= CPU_MAX_OVERTEMP) critical_state = 1; if (state->overtemp > 0) { state->rpm = state->mpu.rmaxn_exhaust_fan; state->intake_rpm = intake = state->mpu.rmaxn_intake_fan; goto do_set_fans; } /* Do the PID */ do_cpu_pid(state, temp, power); /* Range check */ state->rpm = max(state->rpm, (int)state->mpu.rminn_exhaust_fan); state->rpm = min(state->rpm, (int)state->mpu.rmaxn_exhaust_fan); /* Calculate intake fan */ intake = (state->rpm * CPU_INTAKE_SCALE) >> 16; intake = max(intake, (int)state->mpu.rminn_intake_fan); intake = min(intake, (int)state->mpu.rmaxn_intake_fan); state->intake_rpm = intake; do_set_fans: DBG("** CPU %d RPM: %d Ex, %d In, overtemp: %d\n", state->index, (int)state->rpm, intake, state->overtemp); /* We should check for errors, shouldn't we ? But then, what * do we do once the error occurs ? For FCU notified fan * failures (-EFAULT) we probably want to notify userland * some way... */ if (state->index == 0) { set_rpm_fan(CPUA_INTAKE_FAN_RPM_INDEX, intake); set_rpm_fan(CPUA_EXHAUST_FAN_RPM_INDEX, state->rpm); } else { set_rpm_fan(CPUB_INTAKE_FAN_RPM_INDEX, intake); set_rpm_fan(CPUB_EXHAUST_FAN_RPM_INDEX, state->rpm); } } static void do_monitor_cpu_rack(struct cpu_pid_state *state) { s32 temp, power, fan_min; int rc; /* Read current fan status */ rc = do_read_one_cpu_values(state, &temp, &power); if (rc < 0) { /* XXX What do we do now ? */ } /* Check tmax, increment overtemp if we are there. At tmax+8, we go * full blown immediately and try to trigger a shutdown */ if (temp >= ((state->mpu.tmax + 8) << 16)) { printk(KERN_WARNING "Warning ! CPU %d temperature way above maximum" " (%d) !\n", state->index, temp >> 16); state->overtemp = CPU_MAX_OVERTEMP / 4; } else if (temp > (state->mpu.tmax << 16)) { state->overtemp++; printk(KERN_WARNING "CPU %d temperature %d above max %d. overtemp %d\n", state->index, temp >> 16, state->mpu.tmax, state->overtemp); } else { if (state->overtemp) printk(KERN_WARNING "CPU %d temperature back down to %d\n", state->index, temp >> 16); state->overtemp = 0; } if (state->overtemp >= CPU_MAX_OVERTEMP) critical_state = 1; if (state->overtemp > 0) { state->rpm = state->intake_rpm = state->mpu.rmaxn_intake_fan; goto do_set_fans; } /* Do the PID */ do_cpu_pid(state, temp, power); /* Check clamp from dimms */ fan_min = dimm_output_clamp; fan_min = max(fan_min, (int)state->mpu.rminn_intake_fan); DBG(" CPU min mpu = %d, min dimm = %d\n", state->mpu.rminn_intake_fan, dimm_output_clamp); state->rpm = max(state->rpm, (int)fan_min); state->rpm = min(state->rpm, (int)state->mpu.rmaxn_intake_fan); state->intake_rpm = state->rpm; do_set_fans: DBG("** CPU %d RPM: %d overtemp: %d\n", state->index, (int)state->rpm, state->overtemp); /* We should check for errors, shouldn't we ? But then, what * do we do once the error occurs ? For FCU notified fan * failures (-EFAULT) we probably want to notify userland * some way... */ if (state->index == 0) { set_rpm_fan(CPU_A1_FAN_RPM_INDEX, state->rpm); set_rpm_fan(CPU_A2_FAN_RPM_INDEX, state->rpm); set_rpm_fan(CPU_A3_FAN_RPM_INDEX, state->rpm); } else { set_rpm_fan(CPU_B1_FAN_RPM_INDEX, state->rpm); set_rpm_fan(CPU_B2_FAN_RPM_INDEX, state->rpm); set_rpm_fan(CPU_B3_FAN_RPM_INDEX, state->rpm); } } /* * Initialize the state structure for one CPU control loop */ static int init_processor_state(struct cpu_pid_state *state, int index) { int err; state->index = index; state->first = 1; state->rpm = (cpu_pid_type == CPU_PID_TYPE_RACKMAC) ? 4000 : 1000; state->overtemp = 0; state->adc_config = 0x00; if (index == 0) state->monitor = attach_i2c_chip(SUPPLY_MONITOR_ID, "CPU0_monitor"); else if (index == 1) state->monitor = attach_i2c_chip(SUPPLY_MONITORB_ID, "CPU1_monitor"); if (state->monitor == NULL) goto fail; if (read_eeprom(index, &state->mpu)) goto fail; state->count_power = state->mpu.tguardband; if (state->count_power > CPU_POWER_HISTORY_SIZE) { printk(KERN_WARNING "Warning ! too many power history slots\n"); state->count_power = CPU_POWER_HISTORY_SIZE; } DBG("CPU %d Using %d power history entries\n", index, state->count_power); if (index == 0) { err = device_create_file(&of_dev->dev, &dev_attr_cpu0_temperature); err |= device_create_file(&of_dev->dev, &dev_attr_cpu0_voltage); err |= device_create_file(&of_dev->dev, &dev_attr_cpu0_current); err |= device_create_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm); err |= device_create_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm); } else { err = device_create_file(&of_dev->dev, &dev_attr_cpu1_temperature); err |= device_create_file(&of_dev->dev, &dev_attr_cpu1_voltage); err |= device_create_file(&of_dev->dev, &dev_attr_cpu1_current); err |= device_create_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm); err |= device_create_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm); } if (err) printk(KERN_WARNING "Failed to create some of the attribute" "files for CPU %d\n", index); return 0; fail: state->monitor = NULL; return -ENODEV; } /* * Dispose of the state data for one CPU control loop */ static void dispose_processor_state(struct cpu_pid_state *state) { if (state->monitor == NULL) return; if (state->index == 0) { device_remove_file(&of_dev->dev, &dev_attr_cpu0_temperature); device_remove_file(&of_dev->dev, &dev_attr_cpu0_voltage); device_remove_file(&of_dev->dev, &dev_attr_cpu0_current); device_remove_file(&of_dev->dev, &dev_attr_cpu0_exhaust_fan_rpm); device_remove_file(&of_dev->dev, &dev_attr_cpu0_intake_fan_rpm); } else { device_remove_file(&of_dev->dev, &dev_attr_cpu1_temperature); device_remove_file(&of_dev->dev, &dev_attr_cpu1_voltage); device_remove_file(&of_dev->dev, &dev_attr_cpu1_current); device_remove_file(&of_dev->dev, &dev_attr_cpu1_exhaust_fan_rpm); device_remove_file(&of_dev->dev, &dev_attr_cpu1_intake_fan_rpm); } state->monitor = NULL; } /* * Motherboard backside & U3 heatsink fan control loop */ static void do_monitor_backside(struct backside_pid_state *state) { s32 temp, integral, derivative, fan_min; s64 integ_p, deriv_p, prop_p, sum; int i, rc; if (--state->ticks != 0) return; state->ticks = backside_params.interval; DBG("backside:\n"); /* Check fan status */ rc = get_pwm_fan(BACKSIDE_FAN_PWM_INDEX); if (rc < 0) { printk(KERN_WARNING "Error %d reading backside fan !\n", rc); /* XXX What do we do now ? */ } else state->pwm = rc; DBG(" current pwm: %d\n", state->pwm); /* Get some sensor readings */ temp = i2c_smbus_read_byte_data(state->monitor, MAX6690_EXT_TEMP) << 16; state->last_temp = temp; DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp), FIX32TOPRINT(backside_params.input_target)); /* Store temperature and error in history array */ state->cur_sample = (state->cur_sample + 1) % BACKSIDE_PID_HISTORY_SIZE; state->sample_history[state->cur_sample] = temp; state->error_history[state->cur_sample] = temp - backside_params.input_target; /* If first loop, fill the history table */ if (state->first) { for (i = 0; i < (BACKSIDE_PID_HISTORY_SIZE - 1); i++) { state->cur_sample = (state->cur_sample + 1) % BACKSIDE_PID_HISTORY_SIZE; state->sample_history[state->cur_sample] = temp; state->error_history[state->cur_sample] = temp - backside_params.input_target; } state->first = 0; } /* Calculate the integral term */ sum = 0; integral = 0; for (i = 0; i < BACKSIDE_PID_HISTORY_SIZE; i++) integral += state->error_history[i]; integral *= backside_params.interval; DBG(" integral: %08x\n", integral); integ_p = ((s64)backside_params.G_r) * (s64)integral; DBG(" integ_p: %d\n", (int)(integ_p >> 36)); sum += integ_p; /* Calculate the derivative term */ derivative = state->error_history[state->cur_sample] - state->error_history[(state->cur_sample + BACKSIDE_PID_HISTORY_SIZE - 1) % BACKSIDE_PID_HISTORY_SIZE]; derivative /= backside_params.interval; deriv_p = ((s64)backside_params.G_d) * (s64)derivative; DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); sum += deriv_p; /* Calculate the proportional term */ prop_p = ((s64)backside_params.G_p) * (s64)(state->error_history[state->cur_sample]); DBG(" prop_p: %d\n", (int)(prop_p >> 36)); sum += prop_p; /* Scale sum */ sum >>= 36; DBG(" sum: %d\n", (int)sum); if (backside_params.additive) state->pwm += (s32)sum; else state->pwm = sum; /* Check for clamp */ fan_min = (dimm_output_clamp * 100) / 14000; fan_min = max(fan_min, backside_params.output_min); state->pwm = max(state->pwm, fan_min); state->pwm = min(state->pwm, backside_params.output_max); DBG("** BACKSIDE PWM: %d\n", (int)state->pwm); set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, state->pwm); } /* * Initialize the state structure for the backside fan control loop */ static int init_backside_state(struct backside_pid_state *state) { struct device_node *u3; int u3h = 1; /* conservative by default */ int err; /* * There are different PID params for machines with U3 and machines * with U3H, pick the right ones now */ u3 = of_find_node_by_path("/u3@0,f8000000"); if (u3 != NULL) { const u32 *vers = of_get_property(u3, "device-rev", NULL); if (vers) if (((*vers) & 0x3f) < 0x34) u3h = 0; of_node_put(u3); } if (rackmac) { backside_params.G_d = BACKSIDE_PID_RACK_G_d; backside_params.input_target = BACKSIDE_PID_RACK_INPUT_TARGET; backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN; backside_params.interval = BACKSIDE_PID_RACK_INTERVAL; backside_params.G_p = BACKSIDE_PID_RACK_G_p; backside_params.G_r = BACKSIDE_PID_G_r; backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX; backside_params.additive = 0; } else if (u3h) { backside_params.G_d = BACKSIDE_PID_U3H_G_d; backside_params.input_target = BACKSIDE_PID_U3H_INPUT_TARGET; backside_params.output_min = BACKSIDE_PID_U3H_OUTPUT_MIN; backside_params.interval = BACKSIDE_PID_INTERVAL; backside_params.G_p = BACKSIDE_PID_G_p; backside_params.G_r = BACKSIDE_PID_G_r; backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX; backside_params.additive = 1; } else { backside_params.G_d = BACKSIDE_PID_U3_G_d; backside_params.input_target = BACKSIDE_PID_U3_INPUT_TARGET; backside_params.output_min = BACKSIDE_PID_U3_OUTPUT_MIN; backside_params.interval = BACKSIDE_PID_INTERVAL; backside_params.G_p = BACKSIDE_PID_G_p; backside_params.G_r = BACKSIDE_PID_G_r; backside_params.output_max = BACKSIDE_PID_OUTPUT_MAX; backside_params.additive = 1; } state->ticks = 1; state->first = 1; state->pwm = 50; state->monitor = attach_i2c_chip(BACKSIDE_MAX_ID, "backside_temp"); if (state->monitor == NULL) return -ENODEV; err = device_create_file(&of_dev->dev, &dev_attr_backside_temperature); err |= device_create_file(&of_dev->dev, &dev_attr_backside_fan_pwm); if (err) printk(KERN_WARNING "Failed to create attribute file(s)" " for backside fan\n"); return 0; } /* * Dispose of the state data for the backside control loop */ static void dispose_backside_state(struct backside_pid_state *state) { if (state->monitor == NULL) return; device_remove_file(&of_dev->dev, &dev_attr_backside_temperature); device_remove_file(&of_dev->dev, &dev_attr_backside_fan_pwm); state->monitor = NULL; } /* * Drives bay fan control loop */ static void do_monitor_drives(struct drives_pid_state *state) { s32 temp, integral, derivative; s64 integ_p, deriv_p, prop_p, sum; int i, rc; if (--state->ticks != 0) return; state->ticks = DRIVES_PID_INTERVAL; DBG("drives:\n"); /* Check fan status */ rc = get_rpm_fan(DRIVES_FAN_RPM_INDEX, !RPM_PID_USE_ACTUAL_SPEED); if (rc < 0) { printk(KERN_WARNING "Error %d reading drives fan !\n", rc); /* XXX What do we do now ? */ } else state->rpm = rc; DBG(" current rpm: %d\n", state->rpm); /* Get some sensor readings */ temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor, DS1775_TEMP)) << 8; state->last_temp = temp; DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp), FIX32TOPRINT(DRIVES_PID_INPUT_TARGET)); /* Store temperature and error in history array */ state->cur_sample = (state->cur_sample + 1) % DRIVES_PID_HISTORY_SIZE; state->sample_history[state->cur_sample] = temp; state->error_history[state->cur_sample] = temp - DRIVES_PID_INPUT_TARGET; /* If first loop, fill the history table */ if (state->first) { for (i = 0; i < (DRIVES_PID_HISTORY_SIZE - 1); i++) { state->cur_sample = (state->cur_sample + 1) % DRIVES_PID_HISTORY_SIZE; state->sample_history[state->cur_sample] = temp; state->error_history[state->cur_sample] = temp - DRIVES_PID_INPUT_TARGET; } state->first = 0; } /* Calculate the integral term */ sum = 0; integral = 0; for (i = 0; i < DRIVES_PID_HISTORY_SIZE; i++) integral += state->error_history[i]; integral *= DRIVES_PID_INTERVAL; DBG(" integral: %08x\n", integral); integ_p = ((s64)DRIVES_PID_G_r) * (s64)integral; DBG(" integ_p: %d\n", (int)(integ_p >> 36)); sum += integ_p; /* Calculate the derivative term */ derivative = state->error_history[state->cur_sample] - state->error_history[(state->cur_sample + DRIVES_PID_HISTORY_SIZE - 1) % DRIVES_PID_HISTORY_SIZE]; derivative /= DRIVES_PID_INTERVAL; deriv_p = ((s64)DRIVES_PID_G_d) * (s64)derivative; DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); sum += deriv_p; /* Calculate the proportional term */ prop_p = ((s64)DRIVES_PID_G_p) * (s64)(state->error_history[state->cur_sample]); DBG(" prop_p: %d\n", (int)(prop_p >> 36)); sum += prop_p; /* Scale sum */ sum >>= 36; DBG(" sum: %d\n", (int)sum); state->rpm += (s32)sum; state->rpm = max(state->rpm, DRIVES_PID_OUTPUT_MIN); state->rpm = min(state->rpm, DRIVES_PID_OUTPUT_MAX); DBG("** DRIVES RPM: %d\n", (int)state->rpm); set_rpm_fan(DRIVES_FAN_RPM_INDEX, state->rpm); } /* * Initialize the state structure for the drives bay fan control loop */ static int init_drives_state(struct drives_pid_state *state) { int err; state->ticks = 1; state->first = 1; state->rpm = 1000; state->monitor = attach_i2c_chip(DRIVES_DALLAS_ID, "drives_temp"); if (state->monitor == NULL) return -ENODEV; err = device_create_file(&of_dev->dev, &dev_attr_drives_temperature); err |= device_create_file(&of_dev->dev, &dev_attr_drives_fan_rpm); if (err) printk(KERN_WARNING "Failed to create attribute file(s)" " for drives bay fan\n"); return 0; } /* * Dispose of the state data for the drives control loop */ static void dispose_drives_state(struct drives_pid_state *state) { if (state->monitor == NULL) return; device_remove_file(&of_dev->dev, &dev_attr_drives_temperature); device_remove_file(&of_dev->dev, &dev_attr_drives_fan_rpm); state->monitor = NULL; } /* * DIMMs temp control loop */ static void do_monitor_dimms(struct dimm_pid_state *state) { s32 temp, integral, derivative, fan_min; s64 integ_p, deriv_p, prop_p, sum; int i; if (--state->ticks != 0) return; state->ticks = DIMM_PID_INTERVAL; DBG("DIMM:\n"); DBG(" current value: %d\n", state->output); temp = read_lm87_reg(state->monitor, LM87_INT_TEMP); if (temp < 0) return; temp <<= 16; state->last_temp = temp; DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp), FIX32TOPRINT(DIMM_PID_INPUT_TARGET)); /* Store temperature and error in history array */ state->cur_sample = (state->cur_sample + 1) % DIMM_PID_HISTORY_SIZE; state->sample_history[state->cur_sample] = temp; state->error_history[state->cur_sample] = temp - DIMM_PID_INPUT_TARGET; /* If first loop, fill the history table */ if (state->first) { for (i = 0; i < (DIMM_PID_HISTORY_SIZE - 1); i++) { state->cur_sample = (state->cur_sample + 1) % DIMM_PID_HISTORY_SIZE; state->sample_history[state->cur_sample] = temp; state->error_history[state->cur_sample] = temp - DIMM_PID_INPUT_TARGET; } state->first = 0; } /* Calculate the integral term */ sum = 0; integral = 0; for (i = 0; i < DIMM_PID_HISTORY_SIZE; i++) integral += state->error_history[i]; integral *= DIMM_PID_INTERVAL; DBG(" integral: %08x\n", integral); integ_p = ((s64)DIMM_PID_G_r) * (s64)integral; DBG(" integ_p: %d\n", (int)(integ_p >> 36)); sum += integ_p; /* Calculate the derivative term */ derivative = state->error_history[state->cur_sample] - state->error_history[(state->cur_sample + DIMM_PID_HISTORY_SIZE - 1) % DIMM_PID_HISTORY_SIZE]; derivative /= DIMM_PID_INTERVAL; deriv_p = ((s64)DIMM_PID_G_d) * (s64)derivative; DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); sum += deriv_p; /* Calculate the proportional term */ prop_p = ((s64)DIMM_PID_G_p) * (s64)(state->error_history[state->cur_sample]); DBG(" prop_p: %d\n", (int)(prop_p >> 36)); sum += prop_p; /* Scale sum */ sum >>= 36; DBG(" sum: %d\n", (int)sum); state->output = (s32)sum; state->output = max(state->output, DIMM_PID_OUTPUT_MIN); state->output = min(state->output, DIMM_PID_OUTPUT_MAX); dimm_output_clamp = state->output; DBG("** DIMM clamp value: %d\n", (int)state->output); /* Backside PID is only every 5 seconds, force backside fan clamping now */ fan_min = (dimm_output_clamp * 100) / 14000; fan_min = max(fan_min, backside_params.output_min); if (backside_state.pwm < fan_min) { backside_state.pwm = fan_min; DBG(" -> applying clamp to backside fan now: %d !\n", fan_min); set_pwm_fan(BACKSIDE_FAN_PWM_INDEX, fan_min); } } /* * Initialize the state structure for the DIMM temp control loop */ static int init_dimms_state(struct dimm_pid_state *state) { state->ticks = 1; state->first = 1; state->output = 4000; state->monitor = attach_i2c_chip(XSERVE_DIMMS_LM87, "dimms_temp"); if (state->monitor == NULL) return -ENODEV; if (device_create_file(&of_dev->dev, &dev_attr_dimms_temperature)) printk(KERN_WARNING "Failed to create attribute file" " for DIMM temperature\n"); return 0; } /* * Dispose of the state data for the DIMM control loop */ static void dispose_dimms_state(struct dimm_pid_state *state) { if (state->monitor == NULL) return; device_remove_file(&of_dev->dev, &dev_attr_dimms_temperature); state->monitor = NULL; } /* * Slots fan control loop */ static void do_monitor_slots(struct slots_pid_state *state) { s32 temp, integral, derivative; s64 integ_p, deriv_p, prop_p, sum; int i, rc; if (--state->ticks != 0) return; state->ticks = SLOTS_PID_INTERVAL; DBG("slots:\n"); /* Check fan status */ rc = get_pwm_fan(SLOTS_FAN_PWM_INDEX); if (rc < 0) { printk(KERN_WARNING "Error %d reading slots fan !\n", rc); /* XXX What do we do now ? */ } else state->pwm = rc; DBG(" current pwm: %d\n", state->pwm); /* Get some sensor readings */ temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor, DS1775_TEMP)) << 8; state->last_temp = temp; DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp), FIX32TOPRINT(SLOTS_PID_INPUT_TARGET)); /* Store temperature and error in history array */ state->cur_sample = (state->cur_sample + 1) % SLOTS_PID_HISTORY_SIZE; state->sample_history[state->cur_sample] = temp; state->error_history[state->cur_sample] = temp - SLOTS_PID_INPUT_TARGET; /* If first loop, fill the history table */ if (state->first) { for (i = 0; i < (SLOTS_PID_HISTORY_SIZE - 1); i++) { state->cur_sample = (state->cur_sample + 1) % SLOTS_PID_HISTORY_SIZE; state->sample_history[state->cur_sample] = temp; state->error_history[state->cur_sample] = temp - SLOTS_PID_INPUT_TARGET; } state->first = 0; } /* Calculate the integral term */ sum = 0; integral = 0; for (i = 0; i < SLOTS_PID_HISTORY_SIZE; i++) integral += state->error_history[i]; integral *= SLOTS_PID_INTERVAL; DBG(" integral: %08x\n", integral); integ_p = ((s64)SLOTS_PID_G_r) * (s64)integral; DBG(" integ_p: %d\n", (int)(integ_p >> 36)); sum += integ_p; /* Calculate the derivative term */ derivative = state->error_history[state->cur_sample] - state->error_history[(state->cur_sample + SLOTS_PID_HISTORY_SIZE - 1) % SLOTS_PID_HISTORY_SIZE]; derivative /= SLOTS_PID_INTERVAL; deriv_p = ((s64)SLOTS_PID_G_d) * (s64)derivative; DBG(" deriv_p: %d\n", (int)(deriv_p >> 36)); sum += deriv_p; /* Calculate the proportional term */ prop_p = ((s64)SLOTS_PID_G_p) * (s64)(state->error_history[state->cur_sample]); DBG(" prop_p: %d\n", (int)(prop_p >> 36)); sum += prop_p; /* Scale sum */ sum >>= 36; DBG(" sum: %d\n", (int)sum); state->pwm = (s32)sum; state->pwm = max(state->pwm, SLOTS_PID_OUTPUT_MIN); state->pwm = min(state->pwm, SLOTS_PID_OUTPUT_MAX); DBG("** DRIVES PWM: %d\n", (int)state->pwm); set_pwm_fan(SLOTS_FAN_PWM_INDEX, state->pwm); } /* * Initialize the state structure for the slots bay fan control loop */ static int init_slots_state(struct slots_pid_state *state) { int err; state->ticks = 1; state->first = 1; state->pwm = 50; state->monitor = attach_i2c_chip(XSERVE_SLOTS_LM75, "slots_temp"); if (state->monitor == NULL) return -ENODEV; err = device_create_file(&of_dev->dev, &dev_attr_slots_temperature); err |= device_create_file(&of_dev->dev, &dev_attr_slots_fan_pwm); if (err) printk(KERN_WARNING "Failed to create attribute file(s)" " for slots bay fan\n"); return 0; } /* * Dispose of the state data for the slots control loop */ static void dispose_slots_state(struct slots_pid_state *state) { if (state->monitor == NULL) return; device_remove_file(&of_dev->dev, &dev_attr_slots_temperature); device_remove_file(&of_dev->dev, &dev_attr_slots_fan_pwm); state->monitor = NULL; } static int call_critical_overtemp(void) { char *argv[] = { critical_overtemp_path, NULL }; static char *envp[] = { "HOME=/", "TERM=linux", "PATH=/sbin:/usr/sbin:/bin:/usr/bin", NULL }; return call_usermodehelper(critical_overtemp_path, argv, envp, UMH_WAIT_EXEC); } /* * Here's the kernel thread that calls the various control loops */ static int main_control_loop(void *x) { DBG("main_control_loop started\n"); mutex_lock(&driver_lock); if (start_fcu() < 0) { printk(KERN_ERR "kfand: failed to start FCU\n"); mutex_unlock(&driver_lock); goto out; } /* Set the PCI fan once for now on non-RackMac */ if (!rackmac) set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM); /* Initialize ADCs */ initialize_adc(&processor_state[0]); if (processor_state[1].monitor != NULL) initialize_adc(&processor_state[1]); fcu_tickle_ticks = FCU_TICKLE_TICKS; mutex_unlock(&driver_lock); while (state == state_attached) { unsigned long elapsed, start; start = jiffies; mutex_lock(&driver_lock); /* Tickle the FCU just in case */ if (--fcu_tickle_ticks < 0) { fcu_tickle_ticks = FCU_TICKLE_TICKS; tickle_fcu(); } /* First, we always calculate the new DIMMs state on an Xserve */ if (rackmac) do_monitor_dimms(&dimms_state); /* Then, the CPUs */ if (cpu_pid_type == CPU_PID_TYPE_COMBINED) do_monitor_cpu_combined(); else if (cpu_pid_type == CPU_PID_TYPE_RACKMAC) { do_monitor_cpu_rack(&processor_state[0]); if (processor_state[1].monitor != NULL) do_monitor_cpu_rack(&processor_state[1]); // better deal with UP } else { do_monitor_cpu_split(&processor_state[0]); if (processor_state[1].monitor != NULL) do_monitor_cpu_split(&processor_state[1]); // better deal with UP } /* Then, the rest */ do_monitor_backside(&backside_state); if (rackmac) do_monitor_slots(&slots_state); else do_monitor_drives(&drives_state); mutex_unlock(&driver_lock); if (critical_state == 1) { printk(KERN_WARNING "Temperature control detected a critical condition\n"); printk(KERN_WARNING "Attempting to shut down...\n"); if (call_critical_overtemp()) { printk(KERN_WARNING "Can't call %s, power off now!\n", critical_overtemp_path); machine_power_off(); } } if (critical_state > 0) critical_state++; if (critical_state > MAX_CRITICAL_STATE) { printk(KERN_WARNING "Shutdown timed out, power off now !\n"); machine_power_off(); } // FIXME: Deal with signals elapsed = jiffies - start; if (elapsed < HZ) schedule_timeout_interruptible(HZ - elapsed); } out: DBG("main_control_loop ended\n"); ctrl_task = 0; complete_and_exit(&ctrl_complete, 0); } /* * Dispose the control loops when tearing down */ static void dispose_control_loops(void) { dispose_processor_state(&processor_state[0]); dispose_processor_state(&processor_state[1]); dispose_backside_state(&backside_state); dispose_drives_state(&drives_state); dispose_slots_state(&slots_state); dispose_dimms_state(&dimms_state); } /* * Create the control loops. U3-0 i2c bus is up, so we can now * get to the various sensors */ static int create_control_loops(void) { struct device_node *np; /* Count CPUs from the device-tree, we don't care how many are * actually used by Linux */ cpu_count = 0; for (np = NULL; NULL != (np = of_find_node_by_type(np, "cpu"));) cpu_count++; DBG("counted %d CPUs in the device-tree\n", cpu_count); /* Decide the type of PID algorithm to use based on the presence of * the pumps, though that may not be the best way, that is good enough * for now */ if (rackmac) cpu_pid_type = CPU_PID_TYPE_RACKMAC; else if (of_machine_is_compatible("PowerMac7,3") && (cpu_count > 1) && fcu_fans[CPUA_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID && fcu_fans[CPUB_PUMP_RPM_INDEX].id != FCU_FAN_ABSENT_ID) { printk(KERN_INFO "Liquid cooling pumps detected, using new algorithm !\n"); cpu_pid_type = CPU_PID_TYPE_COMBINED; } else cpu_pid_type = CPU_PID_TYPE_SPLIT; /* Create control loops for everything. If any fail, everything * fails */ if (init_processor_state(&processor_state[0], 0)) goto fail; if (cpu_pid_type == CPU_PID_TYPE_COMBINED) fetch_cpu_pumps_minmax(); if (cpu_count > 1 && init_processor_state(&processor_state[1], 1)) goto fail; if (init_backside_state(&backside_state)) goto fail; if (rackmac && init_dimms_state(&dimms_state)) goto fail; if (rackmac && init_slots_state(&slots_state)) goto fail; if (!rackmac && init_drives_state(&drives_state)) goto fail; DBG("all control loops up !\n"); return 0; fail: DBG("failure creating control loops, disposing\n"); dispose_control_loops(); return -ENODEV; } /* * Start the control loops after everything is up, that is create * the thread that will make them run */ static void start_control_loops(void) { init_completion(&ctrl_complete); ctrl_task = kthread_run(main_control_loop, NULL, "kfand"); } /* * Stop the control loops when tearing down */ static void stop_control_loops(void) { if (ctrl_task) wait_for_completion(&ctrl_complete); } /* * Attach to the i2c FCU after detecting U3-1 bus */ static int attach_fcu(void) { fcu = attach_i2c_chip(FAN_CTRLER_ID, "fcu"); if (fcu == NULL) return -ENODEV; DBG("FCU attached\n"); return 0; } /* * Detach from the i2c FCU when tearing down */ static void detach_fcu(void) { fcu = NULL; } /* * Attach to the i2c controller. We probe the various chips based * on the device-tree nodes and build everything for the driver to * run, we then kick the driver monitoring thread */ static int therm_pm72_attach(struct i2c_adapter *adapter) { mutex_lock(&driver_lock); /* Check state */ if (state == state_detached) state = state_attaching; if (state != state_attaching) { mutex_unlock(&driver_lock); return 0; } /* Check if we are looking for one of these */ if (u3_0 == NULL && !strcmp(adapter->name, "u3 0")) { u3_0 = adapter; DBG("found U3-0\n"); if (k2 || !rackmac) if (create_control_loops()) u3_0 = NULL; } else if (u3_1 == NULL && !strcmp(adapter->name, "u3 1")) { u3_1 = adapter; DBG("found U3-1, attaching FCU\n"); if (attach_fcu()) u3_1 = NULL; } else if (k2 == NULL && !strcmp(adapter->name, "mac-io 0")) { k2 = adapter; DBG("Found K2\n"); if (u3_0 && rackmac) if (create_control_loops()) k2 = NULL; } /* We got all we need, start control loops */ if (u3_0 != NULL && u3_1 != NULL && (k2 || !rackmac)) { DBG("everything up, starting control loops\n"); state = state_attached; start_control_loops(); } mutex_unlock(&driver_lock); return 0; } static int therm_pm72_probe(struct i2c_client *client, const struct i2c_device_id *id) { /* Always succeed, the real work was done in therm_pm72_attach() */ return 0; } /* * Called when any of the devices which participates into thermal management * is going away. */ static int therm_pm72_remove(struct i2c_client *client) { struct i2c_adapter *adapter = client->adapter; mutex_lock(&driver_lock); if (state != state_detached) state = state_detaching; /* Stop control loops if any */ DBG("stopping control loops\n"); mutex_unlock(&driver_lock); stop_control_loops(); mutex_lock(&driver_lock); if (u3_0 != NULL && !strcmp(adapter->name, "u3 0")) { DBG("lost U3-0, disposing control loops\n"); dispose_control_loops(); u3_0 = NULL; } if (u3_1 != NULL && !strcmp(adapter->name, "u3 1")) { DBG("lost U3-1, detaching FCU\n"); detach_fcu(); u3_1 = NULL; } if (u3_0 == NULL && u3_1 == NULL) state = state_detached; mutex_unlock(&driver_lock); return 0; } /* * i2c_driver structure to attach to the host i2c controller */ static const struct i2c_device_id therm_pm72_id[] = { /* * Fake device name, thermal management is done by several * chips but we don't need to differentiate between them at * this point. */ { "therm_pm72", 0 }, { } }; static struct i2c_driver therm_pm72_driver = { .driver = { .name = "therm_pm72", }, .attach_adapter = therm_pm72_attach, .probe = therm_pm72_probe, .remove = therm_pm72_remove, .id_table = therm_pm72_id, }; static int fan_check_loc_match(const char *loc, int fan) { char tmp[64]; char *c, *e; strlcpy(tmp, fcu_fans[fan].loc, 64); c = tmp; for (;;) { e = strchr(c, ','); if (e) *e = 0; if (strcmp(loc, c) == 0) return 1; if (e == NULL) break; c = e + 1; } return 0; } static void fcu_lookup_fans(struct device_node *fcu_node) { struct device_node *np = NULL; int i; /* The table is filled by default with values that are suitable * for the old machines without device-tree informations. We scan * the device-tree and override those values with whatever is * there */ DBG("Looking up FCU controls in device-tree...\n"); while ((np = of_get_next_child(fcu_node, np)) != NULL) { int type = -1; const char *loc; const u32 *reg; DBG(" control: %s, type: %s\n", np->name, np->type); /* Detect control type */ if (!strcmp(np->type, "fan-rpm-control") || !strcmp(np->type, "fan-rpm")) type = FCU_FAN_RPM; if (!strcmp(np->type, "fan-pwm-control") || !strcmp(np->type, "fan-pwm")) type = FCU_FAN_PWM; /* Only care about fans for now */ if (type == -1) continue; /* Lookup for a matching location */ loc = of_get_property(np, "location", NULL); reg = of_get_property(np, "reg", NULL); if (loc == NULL || reg == NULL) continue; DBG(" matching location: %s, reg: 0x%08x\n", loc, *reg); for (i = 0; i < FCU_FAN_COUNT; i++) { int fan_id; if (!fan_check_loc_match(loc, i)) continue; DBG(" location match, index: %d\n", i); fcu_fans[i].id = FCU_FAN_ABSENT_ID; if (type != fcu_fans[i].type) { printk(KERN_WARNING "therm_pm72: Fan type mismatch " "in device-tree for %s\n", np->full_name); break; } if (type == FCU_FAN_RPM) fan_id = ((*reg) - 0x10) / 2; else fan_id = ((*reg) - 0x30) / 2; if (fan_id > 7) { printk(KERN_WARNING "therm_pm72: Can't parse " "fan ID in device-tree for %s\n", np->full_name); break; } DBG(" fan id -> %d, type -> %d\n", fan_id, type); fcu_fans[i].id = fan_id; } } /* Now dump the array */ printk(KERN_INFO "Detected fan controls:\n"); for (i = 0; i < FCU_FAN_COUNT; i++) { if (fcu_fans[i].id == FCU_FAN_ABSENT_ID) continue; printk(KERN_INFO " %d: %s fan, id %d, location: %s\n", i, fcu_fans[i].type == FCU_FAN_RPM ? "RPM" : "PWM", fcu_fans[i].id, fcu_fans[i].loc); } } static int fcu_of_probe(struct platform_device* dev) { state = state_detached; of_dev = dev; dev_info(&dev->dev, "PowerMac G5 Thermal control driver %s\n", VERSION); /* Lookup the fans in the device tree */ fcu_lookup_fans(dev->dev.of_node); /* Add the driver */ return i2c_add_driver(&therm_pm72_driver); } static int fcu_of_remove(struct platform_device* dev) { i2c_del_driver(&therm_pm72_driver); return 0; } static const struct of_device_id fcu_match[] = { { .type = "fcu", }, {}, }; MODULE_DEVICE_TABLE(of, fcu_match); static struct platform_driver fcu_of_platform_driver = { .driver = { .name = "temperature", .owner = THIS_MODULE, .of_match_table = fcu_match, }, .probe = fcu_of_probe, .remove = fcu_of_remove }; /* * Check machine type, attach to i2c controller */ static int __init therm_pm72_init(void) { rackmac = of_machine_is_compatible("RackMac3,1"); if (!of_machine_is_compatible("PowerMac7,2") && !of_machine_is_compatible("PowerMac7,3") && !rackmac) return -ENODEV; return platform_driver_register(&fcu_of_platform_driver); } static void __exit therm_pm72_exit(void) { platform_driver_unregister(&fcu_of_platform_driver); } module_init(therm_pm72_init); module_exit(therm_pm72_exit); MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); MODULE_DESCRIPTION("Driver for Apple's PowerMac G5 thermal control"); MODULE_LICENSE("GPL");