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path: root/drivers/macintosh/windfarm_rm31.c
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-rw-r--r--drivers/macintosh/windfarm_rm31.c740
1 files changed, 740 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_rm31.c b/drivers/macintosh/windfarm_rm31.c
new file mode 100644
index 000000000000..3eca6d4b52fc
--- /dev/null
+++ b/drivers/macintosh/windfarm_rm31.c
@@ -0,0 +1,740 @@
+/*
+ * Windfarm PowerMac thermal control.
+ * Control loops for RackMack3,1 (Xserve G5)
+ *
+ * Copyright (C) 2012 Benjamin Herrenschmidt, IBM Corp.
+ *
+ * Use and redistribute under the terms of the GNU GPL v2.
+ */
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <asm/prom.h>
+#include <asm/smu.h>
+
+#include "windfarm.h"
+#include "windfarm_pid.h"
+#include "windfarm_mpu.h"
+
+#define VERSION "1.0"
+
+#undef DEBUG
+#undef LOTSA_DEBUG
+
+#ifdef DEBUG
+#define DBG(args...) printk(args)
+#else
+#define DBG(args...) do { } while(0)
+#endif
+
+#ifdef LOTSA_DEBUG
+#define DBG_LOTS(args...) printk(args)
+#else
+#define DBG_LOTS(args...) do { } while(0)
+#endif
+
+/* define this to force CPU overtemp to 60 degree, useful for testing
+ * the overtemp code
+ */
+#undef HACKED_OVERTEMP
+
+/* We currently only handle 2 chips */
+#define NR_CHIPS 2
+#define NR_CPU_FANS 3 * NR_CHIPS
+
+/* Controls and sensors */
+static struct wf_sensor *sens_cpu_temp[NR_CHIPS];
+static struct wf_sensor *sens_cpu_volts[NR_CHIPS];
+static struct wf_sensor *sens_cpu_amps[NR_CHIPS];
+static struct wf_sensor *backside_temp;
+static struct wf_sensor *slots_temp;
+static struct wf_sensor *dimms_temp;
+
+static struct wf_control *cpu_fans[NR_CHIPS][3];
+static struct wf_control *backside_fan;
+static struct wf_control *slots_fan;
+static struct wf_control *cpufreq_clamp;
+
+/* We keep a temperature history for average calculation of 180s */
+#define CPU_TEMP_HIST_SIZE 180
+
+/* PID loop state */
+static const struct mpu_data *cpu_mpu_data[NR_CHIPS];
+static struct wf_cpu_pid_state cpu_pid[NR_CHIPS];
+static u32 cpu_thist[CPU_TEMP_HIST_SIZE];
+static int cpu_thist_pt;
+static s64 cpu_thist_total;
+static s32 cpu_all_tmax = 100 << 16;
+static struct wf_pid_state backside_pid;
+static int backside_tick;
+static struct wf_pid_state slots_pid;
+static int slots_tick;
+static int slots_speed;
+static struct wf_pid_state dimms_pid;
+static int dimms_output_clamp;
+
+static int nr_chips;
+static bool have_all_controls;
+static bool have_all_sensors;
+static bool started;
+
+static int failure_state;
+#define FAILURE_SENSOR 1
+#define FAILURE_FAN 2
+#define FAILURE_PERM 4
+#define FAILURE_LOW_OVERTEMP 8
+#define FAILURE_HIGH_OVERTEMP 16
+
+/* Overtemp values */
+#define LOW_OVER_AVERAGE 0
+#define LOW_OVER_IMMEDIATE (10 << 16)
+#define LOW_OVER_CLEAR ((-10) << 16)
+#define HIGH_OVER_IMMEDIATE (14 << 16)
+#define HIGH_OVER_AVERAGE (10 << 16)
+#define HIGH_OVER_IMMEDIATE (14 << 16)
+
+
+static void cpu_max_all_fans(void)
+{
+ int i;
+
+ /* We max all CPU fans in case of a sensor error. We also do the
+ * cpufreq clamping now, even if it's supposedly done later by the
+ * generic code anyway, we do it earlier here to react faster
+ */
+ if (cpufreq_clamp)
+ wf_control_set_max(cpufreq_clamp);
+ for (i = 0; i < nr_chips; i++) {
+ if (cpu_fans[i][0])
+ wf_control_set_max(cpu_fans[i][0]);
+ if (cpu_fans[i][1])
+ wf_control_set_max(cpu_fans[i][1]);
+ if (cpu_fans[i][2])
+ wf_control_set_max(cpu_fans[i][2]);
+ }
+}
+
+static int cpu_check_overtemp(s32 temp)
+{
+ int new_state = 0;
+ s32 t_avg, t_old;
+ static bool first = true;
+
+ /* First check for immediate overtemps */
+ if (temp >= (cpu_all_tmax + LOW_OVER_IMMEDIATE)) {
+ new_state |= FAILURE_LOW_OVERTEMP;
+ if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
+ printk(KERN_ERR "windfarm: Overtemp due to immediate CPU"
+ " temperature !\n");
+ }
+ if (temp >= (cpu_all_tmax + HIGH_OVER_IMMEDIATE)) {
+ new_state |= FAILURE_HIGH_OVERTEMP;
+ if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
+ printk(KERN_ERR "windfarm: Critical overtemp due to"
+ " immediate CPU temperature !\n");
+ }
+
+ /*
+ * The first time around, initialize the array with the first
+ * temperature reading
+ */
+ if (first) {
+ int i;
+
+ cpu_thist_total = 0;
+ for (i = 0; i < CPU_TEMP_HIST_SIZE; i++) {
+ cpu_thist[i] = temp;
+ cpu_thist_total += temp;
+ }
+ first = false;
+ }
+
+ /*
+ * We calculate a history of max temperatures and use that for the
+ * overtemp management
+ */
+ t_old = cpu_thist[cpu_thist_pt];
+ cpu_thist[cpu_thist_pt] = temp;
+ cpu_thist_pt = (cpu_thist_pt + 1) % CPU_TEMP_HIST_SIZE;
+ cpu_thist_total -= t_old;
+ cpu_thist_total += temp;
+ t_avg = cpu_thist_total / CPU_TEMP_HIST_SIZE;
+
+ DBG_LOTS(" t_avg = %d.%03d (out: %d.%03d, in: %d.%03d)\n",
+ FIX32TOPRINT(t_avg), FIX32TOPRINT(t_old), FIX32TOPRINT(temp));
+
+ /* Now check for average overtemps */
+ if (t_avg >= (cpu_all_tmax + LOW_OVER_AVERAGE)) {
+ new_state |= FAILURE_LOW_OVERTEMP;
+ if ((failure_state & FAILURE_LOW_OVERTEMP) == 0)
+ printk(KERN_ERR "windfarm: Overtemp due to average CPU"
+ " temperature !\n");
+ }
+ if (t_avg >= (cpu_all_tmax + HIGH_OVER_AVERAGE)) {
+ new_state |= FAILURE_HIGH_OVERTEMP;
+ if ((failure_state & FAILURE_HIGH_OVERTEMP) == 0)
+ printk(KERN_ERR "windfarm: Critical overtemp due to"
+ " average CPU temperature !\n");
+ }
+
+ /* Now handle overtemp conditions. We don't currently use the windfarm
+ * overtemp handling core as it's not fully suited to the needs of those
+ * new machine. This will be fixed later.
+ */
+ if (new_state) {
+ /* High overtemp -> immediate shutdown */
+ if (new_state & FAILURE_HIGH_OVERTEMP)
+ machine_power_off();
+ if ((failure_state & new_state) != new_state)
+ cpu_max_all_fans();
+ failure_state |= new_state;
+ } else if ((failure_state & FAILURE_LOW_OVERTEMP) &&
+ (temp < (cpu_all_tmax + LOW_OVER_CLEAR))) {
+ printk(KERN_ERR "windfarm: Overtemp condition cleared !\n");
+ failure_state &= ~FAILURE_LOW_OVERTEMP;
+ }
+
+ return failure_state & (FAILURE_LOW_OVERTEMP | FAILURE_HIGH_OVERTEMP);
+}
+
+static int read_one_cpu_vals(int cpu, s32 *temp, s32 *power)
+{
+ s32 dtemp, volts, amps;
+ int rc;
+
+ /* Get diode temperature */
+ rc = wf_sensor_get(sens_cpu_temp[cpu], &dtemp);
+ if (rc) {
+ DBG(" CPU%d: temp reading error !\n", cpu);
+ return -EIO;
+ }
+ DBG_LOTS(" CPU%d: temp = %d.%03d\n", cpu, FIX32TOPRINT((dtemp)));
+ *temp = dtemp;
+
+ /* Get voltage */
+ rc = wf_sensor_get(sens_cpu_volts[cpu], &volts);
+ if (rc) {
+ DBG(" CPU%d, volts reading error !\n", cpu);
+ return -EIO;
+ }
+ DBG_LOTS(" CPU%d: volts = %d.%03d\n", cpu, FIX32TOPRINT((volts)));
+
+ /* Get current */
+ rc = wf_sensor_get(sens_cpu_amps[cpu], &amps);
+ if (rc) {
+ DBG(" CPU%d, current reading error !\n", cpu);
+ return -EIO;
+ }
+ DBG_LOTS(" CPU%d: amps = %d.%03d\n", cpu, FIX32TOPRINT((amps)));
+
+ /* Calculate power */
+
+ /* Scale voltage and current raw sensor values according to fixed scales
+ * obtained in Darwin and calculate power from I and V
+ */
+ *power = (((u64)volts) * ((u64)amps)) >> 16;
+
+ DBG_LOTS(" CPU%d: power = %d.%03d\n", cpu, FIX32TOPRINT((*power)));
+
+ return 0;
+
+}
+
+static void cpu_fans_tick(void)
+{
+ int err, cpu, i;
+ s32 speed, temp, power, t_max = 0;
+
+ DBG_LOTS("* cpu fans_tick_split()\n");
+
+ for (cpu = 0; cpu < nr_chips; ++cpu) {
+ struct wf_cpu_pid_state *sp = &cpu_pid[cpu];
+
+ /* Read current speed */
+ wf_control_get(cpu_fans[cpu][0], &sp->target);
+
+ err = read_one_cpu_vals(cpu, &temp, &power);
+ if (err) {
+ failure_state |= FAILURE_SENSOR;
+ cpu_max_all_fans();
+ return;
+ }
+
+ /* Keep track of highest temp */
+ t_max = max(t_max, temp);
+
+ /* Handle possible overtemps */
+ if (cpu_check_overtemp(t_max))
+ return;
+
+ /* Run PID */
+ wf_cpu_pid_run(sp, power, temp);
+
+ DBG_LOTS(" CPU%d: target = %d RPM\n", cpu, sp->target);
+
+ /* Apply DIMMs clamp */
+ speed = max(sp->target, dimms_output_clamp);
+
+ /* Apply result to all cpu fans */
+ for (i = 0; i < 3; i++) {
+ err = wf_control_set(cpu_fans[cpu][i], speed);
+ if (err) {
+ pr_warning("wf_rm31: Fan %s reports error %d\n",
+ cpu_fans[cpu][i]->name, err);
+ failure_state |= FAILURE_FAN;
+ }
+ }
+ }
+}
+
+/* Implementation... */
+static int cpu_setup_pid(int cpu)
+{
+ struct wf_cpu_pid_param pid;
+ const struct mpu_data *mpu = cpu_mpu_data[cpu];
+ s32 tmax, ttarget, ptarget;
+ int fmin, fmax, hsize;
+
+ /* Get PID params from the appropriate MPU EEPROM */
+ tmax = mpu->tmax << 16;
+ ttarget = mpu->ttarget << 16;
+ ptarget = ((s32)(mpu->pmaxh - mpu->padjmax)) << 16;
+
+ DBG("wf_72: CPU%d ttarget = %d.%03d, tmax = %d.%03d\n",
+ cpu, FIX32TOPRINT(ttarget), FIX32TOPRINT(tmax));
+
+ /* We keep a global tmax for overtemp calculations */
+ if (tmax < cpu_all_tmax)
+ cpu_all_tmax = tmax;
+
+ /* Set PID min/max by using the rear fan min/max */
+ fmin = wf_control_get_min(cpu_fans[cpu][0]);
+ fmax = wf_control_get_max(cpu_fans[cpu][0]);
+ DBG("wf_72: CPU%d max RPM range = [%d..%d]\n", cpu, fmin, fmax);
+
+ /* History size */
+ hsize = min_t(int, mpu->tguardband, WF_PID_MAX_HISTORY);
+ DBG("wf_72: CPU%d history size = %d\n", cpu, hsize);
+
+ /* Initialize PID loop */
+ pid.interval = 1; /* seconds */
+ pid.history_len = hsize;
+ pid.gd = mpu->pid_gd;
+ pid.gp = mpu->pid_gp;
+ pid.gr = mpu->pid_gr;
+ pid.tmax = tmax;
+ pid.ttarget = ttarget;
+ pid.pmaxadj = ptarget;
+ pid.min = fmin;
+ pid.max = fmax;
+
+ wf_cpu_pid_init(&cpu_pid[cpu], &pid);
+ cpu_pid[cpu].target = 4000;
+
+ return 0;
+}
+
+/* Backside/U3 fan */
+static struct wf_pid_param backside_param = {
+ .interval = 1,
+ .history_len = 2,
+ .gd = 0x00500000,
+ .gp = 0x0004cccc,
+ .gr = 0,
+ .itarget = 70 << 16,
+ .additive = 0,
+ .min = 20,
+ .max = 100,
+};
+
+/* DIMMs temperature (clamp the backside fan) */
+static struct wf_pid_param dimms_param = {
+ .interval = 1,
+ .history_len = 20,
+ .gd = 0,
+ .gp = 0,
+ .gr = 0x06553600,
+ .itarget = 50 << 16,
+ .additive = 0,
+ .min = 4000,
+ .max = 14000,
+};
+
+static void backside_fan_tick(void)
+{
+ s32 temp, dtemp;
+ int speed, dspeed, fan_min;
+ int err;
+
+ if (!backside_fan || !backside_temp || !dimms_temp || !backside_tick)
+ return;
+ if (--backside_tick > 0)
+ return;
+ backside_tick = backside_pid.param.interval;
+
+ DBG_LOTS("* backside fans tick\n");
+
+ /* Update fan speed from actual fans */
+ err = wf_control_get(backside_fan, &speed);
+ if (!err)
+ backside_pid.target = speed;
+
+ err = wf_sensor_get(backside_temp, &temp);
+ if (err) {
+ printk(KERN_WARNING "windfarm: U3 temp sensor error %d\n",
+ err);
+ failure_state |= FAILURE_SENSOR;
+ wf_control_set_max(backside_fan);
+ return;
+ }
+ speed = wf_pid_run(&backside_pid, temp);
+
+ DBG_LOTS("backside PID temp=%d.%.3d speed=%d\n",
+ FIX32TOPRINT(temp), speed);
+
+ err = wf_sensor_get(dimms_temp, &dtemp);
+ if (err) {
+ printk(KERN_WARNING "windfarm: DIMMs temp sensor error %d\n",
+ err);
+ failure_state |= FAILURE_SENSOR;
+ wf_control_set_max(backside_fan);
+ return;
+ }
+ dspeed = wf_pid_run(&dimms_pid, dtemp);
+ dimms_output_clamp = dspeed;
+
+ fan_min = (dspeed * 100) / 14000;
+ fan_min = max(fan_min, backside_param.min);
+ speed = max(speed, fan_min);
+
+ err = wf_control_set(backside_fan, speed);
+ if (err) {
+ printk(KERN_WARNING "windfarm: backside fan error %d\n", err);
+ failure_state |= FAILURE_FAN;
+ }
+}
+
+static void backside_setup_pid(void)
+{
+ /* first time initialize things */
+ s32 fmin = wf_control_get_min(backside_fan);
+ s32 fmax = wf_control_get_max(backside_fan);
+ struct wf_pid_param param;
+
+ param = backside_param;
+ param.min = max(param.min, fmin);
+ param.max = min(param.max, fmax);
+ wf_pid_init(&backside_pid, &param);
+
+ param = dimms_param;
+ wf_pid_init(&dimms_pid, &param);
+
+ backside_tick = 1;
+
+ pr_info("wf_rm31: Backside control loop started.\n");
+}
+
+/* Slots fan */
+static const struct wf_pid_param slots_param = {
+ .interval = 5,
+ .history_len = 2,
+ .gd = 30 << 20,
+ .gp = 5 << 20,
+ .gr = 0,
+ .itarget = 40 << 16,
+ .additive = 1,
+ .min = 300,
+ .max = 4000,
+};
+
+static void slots_fan_tick(void)
+{
+ s32 temp;
+ int speed;
+ int err;
+
+ if (!slots_fan || !slots_temp || !slots_tick)
+ return;
+ if (--slots_tick > 0)
+ return;
+ slots_tick = slots_pid.param.interval;
+
+ DBG_LOTS("* slots fans tick\n");
+
+ err = wf_sensor_get(slots_temp, &temp);
+ if (err) {
+ pr_warning("wf_rm31: slots temp sensor error %d\n", err);
+ failure_state |= FAILURE_SENSOR;
+ wf_control_set_max(slots_fan);
+ return;
+ }
+ speed = wf_pid_run(&slots_pid, temp);
+
+ DBG_LOTS("slots PID temp=%d.%.3d speed=%d\n",
+ FIX32TOPRINT(temp), speed);
+
+ slots_speed = speed;
+ err = wf_control_set(slots_fan, speed);
+ if (err) {
+ printk(KERN_WARNING "windfarm: slots bay fan error %d\n", err);
+ failure_state |= FAILURE_FAN;
+ }
+}
+
+static void slots_setup_pid(void)
+{
+ /* first time initialize things */
+ s32 fmin = wf_control_get_min(slots_fan);
+ s32 fmax = wf_control_get_max(slots_fan);
+ struct wf_pid_param param = slots_param;
+
+ param.min = max(param.min, fmin);
+ param.max = min(param.max, fmax);
+ wf_pid_init(&slots_pid, &param);
+ slots_tick = 1;
+
+ pr_info("wf_rm31: Slots control loop started.\n");
+}
+
+static void set_fail_state(void)
+{
+ cpu_max_all_fans();
+
+ if (backside_fan)
+ wf_control_set_max(backside_fan);
+ if (slots_fan)
+ wf_control_set_max(slots_fan);
+}
+
+static void rm31_tick(void)
+{
+ int i, last_failure;
+
+ if (!started) {
+ started = 1;
+ printk(KERN_INFO "windfarm: CPUs control loops started.\n");
+ for (i = 0; i < nr_chips; ++i) {
+ if (cpu_setup_pid(i) < 0) {
+ failure_state = FAILURE_PERM;
+ set_fail_state();
+ break;
+ }
+ }
+ DBG_LOTS("cpu_all_tmax=%d.%03d\n", FIX32TOPRINT(cpu_all_tmax));
+
+ backside_setup_pid();
+ slots_setup_pid();
+
+#ifdef HACKED_OVERTEMP
+ cpu_all_tmax = 60 << 16;
+#endif
+ }
+
+ /* Permanent failure, bail out */
+ if (failure_state & FAILURE_PERM)
+ return;
+
+ /*
+ * Clear all failure bits except low overtemp which will be eventually
+ * cleared by the control loop itself
+ */
+ last_failure = failure_state;
+ failure_state &= FAILURE_LOW_OVERTEMP;
+ backside_fan_tick();
+ slots_fan_tick();
+
+ /* We do CPUs last because they can be clamped high by
+ * DIMM temperature
+ */
+ cpu_fans_tick();
+
+ DBG_LOTS(" last_failure: 0x%x, failure_state: %x\n",
+ last_failure, failure_state);
+
+ /* Check for failures. Any failure causes cpufreq clamping */
+ if (failure_state && last_failure == 0 && cpufreq_clamp)
+ wf_control_set_max(cpufreq_clamp);
+ if (failure_state == 0 && last_failure && cpufreq_clamp)
+ wf_control_set_min(cpufreq_clamp);
+
+ /* That's it for now, we might want to deal with other failures
+ * differently in the future though
+ */
+}
+
+static void rm31_new_control(struct wf_control *ct)
+{
+ bool all_controls;
+
+ if (!strcmp(ct->name, "cpu-fan-a-0"))
+ cpu_fans[0][0] = ct;
+ else if (!strcmp(ct->name, "cpu-fan-b-0"))
+ cpu_fans[0][1] = ct;
+ else if (!strcmp(ct->name, "cpu-fan-c-0"))
+ cpu_fans[0][2] = ct;
+ else if (!strcmp(ct->name, "cpu-fan-a-1"))
+ cpu_fans[1][0] = ct;
+ else if (!strcmp(ct->name, "cpu-fan-b-1"))
+ cpu_fans[1][1] = ct;
+ else if (!strcmp(ct->name, "cpu-fan-c-1"))
+ cpu_fans[1][2] = ct;
+ else if (!strcmp(ct->name, "backside-fan"))
+ backside_fan = ct;
+ else if (!strcmp(ct->name, "slots-fan"))
+ slots_fan = ct;
+ else if (!strcmp(ct->name, "cpufreq-clamp"))
+ cpufreq_clamp = ct;
+
+ all_controls =
+ cpu_fans[0][0] &&
+ cpu_fans[0][1] &&
+ cpu_fans[0][2] &&
+ backside_fan &&
+ slots_fan;
+ if (nr_chips > 1)
+ all_controls &=
+ cpu_fans[1][0] &&
+ cpu_fans[1][1] &&
+ cpu_fans[1][2];
+ have_all_controls = all_controls;
+}
+
+
+static void rm31_new_sensor(struct wf_sensor *sr)
+{
+ bool all_sensors;
+
+ if (!strcmp(sr->name, "cpu-diode-temp-0"))
+ sens_cpu_temp[0] = sr;
+ else if (!strcmp(sr->name, "cpu-diode-temp-1"))
+ sens_cpu_temp[1] = sr;
+ else if (!strcmp(sr->name, "cpu-voltage-0"))
+ sens_cpu_volts[0] = sr;
+ else if (!strcmp(sr->name, "cpu-voltage-1"))
+ sens_cpu_volts[1] = sr;
+ else if (!strcmp(sr->name, "cpu-current-0"))
+ sens_cpu_amps[0] = sr;
+ else if (!strcmp(sr->name, "cpu-current-1"))
+ sens_cpu_amps[1] = sr;
+ else if (!strcmp(sr->name, "backside-temp"))
+ backside_temp = sr;
+ else if (!strcmp(sr->name, "slots-temp"))
+ slots_temp = sr;
+ else if (!strcmp(sr->name, "dimms-temp"))
+ dimms_temp = sr;
+
+ all_sensors =
+ sens_cpu_temp[0] &&
+ sens_cpu_volts[0] &&
+ sens_cpu_amps[0] &&
+ backside_temp &&
+ slots_temp &&
+ dimms_temp;
+ if (nr_chips > 1)
+ all_sensors &=
+ sens_cpu_temp[1] &&
+ sens_cpu_volts[1] &&
+ sens_cpu_amps[1];
+
+ have_all_sensors = all_sensors;
+}
+
+static int rm31_wf_notify(struct notifier_block *self,
+ unsigned long event, void *data)
+{
+ switch (event) {
+ case WF_EVENT_NEW_SENSOR:
+ rm31_new_sensor(data);
+ break;
+ case WF_EVENT_NEW_CONTROL:
+ rm31_new_control(data);
+ break;
+ case WF_EVENT_TICK:
+ if (have_all_controls && have_all_sensors)
+ rm31_tick();
+ }
+ return 0;
+}
+
+static struct notifier_block rm31_events = {
+ .notifier_call = rm31_wf_notify,
+};
+
+static int wf_rm31_probe(struct platform_device *dev)
+{
+ wf_register_client(&rm31_events);
+ return 0;
+}
+
+static int __devexit wf_rm31_remove(struct platform_device *dev)
+{
+ wf_unregister_client(&rm31_events);
+
+ /* should release all sensors and controls */
+ return 0;
+}
+
+static struct platform_driver wf_rm31_driver = {
+ .probe = wf_rm31_probe,
+ .remove = wf_rm31_remove,
+ .driver = {
+ .name = "windfarm",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init wf_rm31_init(void)
+{
+ struct device_node *cpu;
+ int i;
+
+ if (!of_machine_is_compatible("RackMac3,1"))
+ return -ENODEV;
+
+ /* Count the number of CPU cores */
+ nr_chips = 0;
+ for (cpu = NULL; (cpu = of_find_node_by_type(cpu, "cpu")) != NULL; )
+ ++nr_chips;
+ if (nr_chips > NR_CHIPS)
+ nr_chips = NR_CHIPS;
+
+ pr_info("windfarm: Initializing for desktop G5 with %d chips\n",
+ nr_chips);
+
+ /* Get MPU data for each CPU */
+ for (i = 0; i < nr_chips; i++) {
+ cpu_mpu_data[i] = wf_get_mpu(i);
+ if (!cpu_mpu_data[i]) {
+ pr_err("wf_rm31: Failed to find MPU data for CPU %d\n", i);
+ return -ENXIO;
+ }
+ }
+
+#ifdef MODULE
+ request_module("windfarm_fcu_controls");
+ request_module("windfarm_lm75_sensor");
+ request_module("windfarm_lm87_sensor");
+ request_module("windfarm_ad7417_sensor");
+ request_module("windfarm_max6690_sensor");
+ request_module("windfarm_cpufreq_clamp");
+#endif /* MODULE */
+
+ platform_driver_register(&wf_rm31_driver);
+ return 0;
+}
+
+static void __exit wf_rm31_exit(void)
+{
+ platform_driver_unregister(&wf_rm31_driver);
+}
+
+module_init(wf_rm31_init);
+module_exit(wf_rm31_exit);
+
+MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
+MODULE_DESCRIPTION("Thermal control for Xserve G5");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:windfarm");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.