+++ /dev/null
-/*
- * 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/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",
- .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");
-
projects / cascardo / linux.git / commitdiff