* - 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 "therm_pm72.h"
-#define VERSION "1.2b2"
+#define VERSION "1.3"
#undef DEBUG
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 int critical_state;
static int rackmac;
static s32 dimm_output_clamp;
-
+static int fcu_rpm_shift;
+static int fcu_tickle_ticks;
static DECLARE_MUTEX(driver_lock);
/*
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;
+ int rc, id, min, max;
if (fcu_fans[fan_index].type != FCU_FAN_RPM)
return -EINVAL;
if (id == FCU_FAN_ABSENT_ID)
return -EINVAL;
- if (rpm < 300)
- rpm = 300;
- else if (rpm > 8191)
- rpm = 8191;
- buf[0] = rpm >> 5;
- buf[1] = rpm << 3;
+ 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;
if (rc != 2)
return -EIO;
- return (buf[0] << 5) | buf[1] >> 3;
+ return (buf[0] << (8 - fcu_rpm_shift)) | buf[1] >> fcu_rpm_shift;
}
static int set_pwm_fan(int fan_index, int pwm)
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
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(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);
/*
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;
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;
+ 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));
}
/*
- * Dispose of the state data for the drives control loop
+ * Dispose of the state data for the DIMM control loop
*/
static void dispose_dimms_state(struct dimm_pid_state *state)
{
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)
+{
+ 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;
+
+ device_create_file(&of_dev->dev, &dev_attr_slots_temperature);
+ device_create_file(&of_dev->dev, &dev_attr_slots_fan_pwm);
+
+ 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);
+
+ detach_i2c_chip(state->monitor);
+ state->monitor = NULL;
+}
+
+
static int call_critical_overtemp(void)
{
char *argv[] = { critical_overtemp_path, NULL };
goto out;
}
- /* Set the PCI fan once for now */
- set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM);
+ /* 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(&cpu_state[0]);
if (cpu_state[1].monitor != NULL)
initialize_adc(&cpu_state[1]);
+ fcu_tickle_ticks = FCU_TICKLE_TICKS;
+
up(&driver_lock);
while (state == state_attached) {
down(&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 rest */
do_monitor_backside(&backside_state);
- if (!rackmac)
+ if (rackmac)
+ do_monitor_slots(&slots_state);
+ else
do_monitor_drives(&drives_state);
up(&driver_lock);
dispose_cpu_state(&cpu_state[1]);
dispose_backside_state(&backside_state);
dispose_drives_state(&drives_state);
+ dispose_slots_state(&slots_state);
dispose_dimms_state(&dimms_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;
projects / linux-2.6 / commitdiff