diff options
Diffstat (limited to 'drivers/macintosh/windfarm_pm91.c')
| -rw-r--r-- | drivers/macintosh/windfarm_pm91.c | 741 |
1 files changed, 741 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_pm91.c b/drivers/macintosh/windfarm_pm91.c new file mode 100644 index 000000000..3f346af9e --- /dev/null +++ b/drivers/macintosh/windfarm_pm91.c @@ -0,0 +1,741 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops + * + * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. + * <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 8.2 snapshot property lists (note however + * that none of the code has been re-used, it's a complete re-implementation + * + * The various control loops found in Darwin config file are: + * + * PowerMac9,1 + * =========== + * + * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't + * try to play with other control loops fans). Drive bay is rather basic PID + * with one sensor and one fan. Slots area is a bit different as the Darwin + * driver is supposed to be capable of working in a special "AGP" mode which + * involves the presence of an AGP sensor and an AGP fan (possibly on the + * AGP card itself). I can't deal with that special mode as I don't have + * access to those additional sensor/fans for now (though ultimately, it would + * be possible to add sensor objects for them) so I'm only implementing the + * basic PCI slot control loop + */ + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <linux/wait.h> +#include <linux/kmod.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <asm/prom.h> +#include <asm/machdep.h> +#include <asm/io.h> +#include <asm/sections.h> +#include <asm/smu.h> + +#include "windfarm.h" +#include "windfarm_pid.h" + +#define VERSION "0.4" + +#undef DEBUG + +#ifdef DEBUG +#define DBG(args...) printk(args) +#else +#define DBG(args...) do { } while(0) +#endif + +/* define this to force CPU overtemp to 74 degree, useful for testing + * the overtemp code + */ +#undef HACKED_OVERTEMP + +/* Controls & sensors */ +static struct wf_sensor *sensor_cpu_power; +static struct wf_sensor *sensor_cpu_temp; +static struct wf_sensor *sensor_hd_temp; +static struct wf_sensor *sensor_slots_power; +static struct wf_control *fan_cpu_main; +static struct wf_control *fan_cpu_second; +static struct wf_control *fan_cpu_third; +static struct wf_control *fan_hd; +static struct wf_control *fan_slots; +static struct wf_control *cpufreq_clamp; + +/* Set to kick the control loop into life */ +static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok; +static bool wf_smu_started; +static bool wf_smu_overtemp; + +/* Failure handling.. could be nicer */ +#define FAILURE_FAN 0x01 +#define FAILURE_SENSOR 0x02 +#define FAILURE_OVERTEMP 0x04 + +static unsigned int wf_smu_failure_state; +static int wf_smu_readjust, wf_smu_skipping; + +/* + * ****** CPU Fans Control Loop ****** + * + */ + + +#define WF_SMU_CPU_FANS_INTERVAL 1 +#define WF_SMU_CPU_FANS_MAX_HISTORY 16 + +/* State data used by the cpu fans control loop + */ +struct wf_smu_cpu_fans_state { + int ticks; + s32 cpu_setpoint; + struct wf_cpu_pid_state pid; +}; + +static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; + + + +/* + * ****** Drive Fan Control Loop ****** + * + */ + +struct wf_smu_drive_fans_state { + int ticks; + s32 setpoint; + struct wf_pid_state pid; +}; + +static struct wf_smu_drive_fans_state *wf_smu_drive_fans; + +/* + * ****** Slots Fan Control Loop ****** + * + */ + +struct wf_smu_slots_fans_state { + int ticks; + s32 setpoint; + struct wf_pid_state pid; +}; + +static struct wf_smu_slots_fans_state *wf_smu_slots_fans; + +/* + * ***** Implementation ***** + * + */ + + +static void wf_smu_create_cpu_fans(void) +{ + struct wf_cpu_pid_param pid_param; + const struct smu_sdbp_header *hdr; + struct smu_sdbp_cpupiddata *piddata; + struct smu_sdbp_fvt *fvt; + s32 tmax, tdelta, maxpow, powadj; + + /* First, locate the PID params in SMU SBD */ + hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); + if (hdr == 0) { + printk(KERN_WARNING "windfarm: CPU PID fan config not found " + "max fan speed\n"); + goto fail; + } + piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; + + /* Get the FVT params for operating point 0 (the only supported one + * for now) in order to get tmax + */ + hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); + if (hdr) { + fvt = (struct smu_sdbp_fvt *)&hdr[1]; + tmax = ((s32)fvt->maxtemp) << 16; + } else + tmax = 0x5e0000; /* 94 degree default */ + + /* Alloc & initialize state */ + wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), + GFP_KERNEL); + if (wf_smu_cpu_fans == NULL) + goto fail; + wf_smu_cpu_fans->ticks = 1; + + /* Fill PID params */ + pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; + pid_param.history_len = piddata->history_len; + if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { + printk(KERN_WARNING "windfarm: History size overflow on " + "CPU control loop (%d)\n", piddata->history_len); + pid_param.history_len = WF_CPU_PID_MAX_HISTORY; + } + pid_param.gd = piddata->gd; + pid_param.gp = piddata->gp; + pid_param.gr = piddata->gr / pid_param.history_len; + + tdelta = ((s32)piddata->target_temp_delta) << 16; + maxpow = ((s32)piddata->max_power) << 16; + powadj = ((s32)piddata->power_adj) << 16; + + pid_param.tmax = tmax; + pid_param.ttarget = tmax - tdelta; + pid_param.pmaxadj = maxpow - powadj; + + pid_param.min = wf_control_get_min(fan_cpu_main); + pid_param.max = wf_control_get_max(fan_cpu_main); + + wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); + + DBG("wf: CPU Fan control initialized.\n"); + DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", + FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), + pid_param.min, pid_param.max); + + return; + + fail: + printk(KERN_WARNING "windfarm: CPU fan config not found\n" + "for this machine model, max fan speed\n"); + + if (cpufreq_clamp) + wf_control_set_max(cpufreq_clamp); + if (fan_cpu_main) + wf_control_set_max(fan_cpu_main); +} + +static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) +{ + s32 new_setpoint, temp, power; + int rc; + + if (--st->ticks != 0) { + if (wf_smu_readjust) + goto readjust; + return; + } + st->ticks = WF_SMU_CPU_FANS_INTERVAL; + + rc = wf_sensor_get(sensor_cpu_temp, &temp); + if (rc) { + printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + rc = wf_sensor_get(sensor_cpu_power, &power); + if (rc) { + printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", + FIX32TOPRINT(temp), FIX32TOPRINT(power)); + +#ifdef HACKED_OVERTEMP + if (temp > 0x4a0000) + wf_smu_failure_state |= FAILURE_OVERTEMP; +#else + if (temp > st->pid.param.tmax) + wf_smu_failure_state |= FAILURE_OVERTEMP; +#endif + new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); + + DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); + + if (st->cpu_setpoint == new_setpoint) + return; + st->cpu_setpoint = new_setpoint; + readjust: + if (fan_cpu_main && wf_smu_failure_state == 0) { + rc = wf_control_set(fan_cpu_main, st->cpu_setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: CPU main fan" + " error %d\n", rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } + if (fan_cpu_second && wf_smu_failure_state == 0) { + rc = wf_control_set(fan_cpu_second, st->cpu_setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: CPU second fan" + " error %d\n", rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } + if (fan_cpu_third && wf_smu_failure_state == 0) { + rc = wf_control_set(fan_cpu_third, st->cpu_setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: CPU third fan" + " error %d\n", rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } +} + +static void wf_smu_create_drive_fans(void) +{ + struct wf_pid_param param = { + .interval = 5, + .history_len = 2, + .gd = 0x01e00000, + .gp = 0x00500000, + .gr = 0x00000000, + .itarget = 0x00200000, + }; + + /* Alloc & initialize state */ + wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state), + GFP_KERNEL); + if (wf_smu_drive_fans == NULL) { + printk(KERN_WARNING "windfarm: Memory allocation error" + " max fan speed\n"); + goto fail; + } + wf_smu_drive_fans->ticks = 1; + + /* Fill PID params */ + param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN); + param.min = wf_control_get_min(fan_hd); + param.max = wf_control_get_max(fan_hd); + wf_pid_init(&wf_smu_drive_fans->pid, ¶m); + + DBG("wf: Drive Fan control initialized.\n"); + DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", + FIX32TOPRINT(param.itarget), param.min, param.max); + return; + + fail: + if (fan_hd) + wf_control_set_max(fan_hd); +} + +static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st) +{ + s32 new_setpoint, temp; + int rc; + + if (--st->ticks != 0) { + if (wf_smu_readjust) + goto readjust; + return; + } + st->ticks = st->pid.param.interval; + + rc = wf_sensor_get(sensor_hd_temp, &temp); + if (rc) { + printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n", + FIX32TOPRINT(temp)); + + if (temp > (st->pid.param.itarget + 0x50000)) + wf_smu_failure_state |= FAILURE_OVERTEMP; + + new_setpoint = wf_pid_run(&st->pid, temp); + + DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); + + if (st->setpoint == new_setpoint) + return; + st->setpoint = new_setpoint; + readjust: + if (fan_hd && wf_smu_failure_state == 0) { + rc = wf_control_set(fan_hd, st->setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: HD fan error %d\n", + rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } +} + +static void wf_smu_create_slots_fans(void) +{ + struct wf_pid_param param = { + .interval = 1, + .history_len = 8, + .gd = 0x00000000, + .gp = 0x00000000, + .gr = 0x00020000, + .itarget = 0x00000000 + }; + + /* Alloc & initialize state */ + wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state), + GFP_KERNEL); + if (wf_smu_slots_fans == NULL) { + printk(KERN_WARNING "windfarm: Memory allocation error" + " max fan speed\n"); + goto fail; + } + wf_smu_slots_fans->ticks = 1; + + /* Fill PID params */ + param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN); + param.min = wf_control_get_min(fan_slots); + param.max = wf_control_get_max(fan_slots); + wf_pid_init(&wf_smu_slots_fans->pid, ¶m); + + DBG("wf: Slots Fan control initialized.\n"); + DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", + FIX32TOPRINT(param.itarget), param.min, param.max); + return; + + fail: + if (fan_slots) + wf_control_set_max(fan_slots); +} + +static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st) +{ + s32 new_setpoint, power; + int rc; + + if (--st->ticks != 0) { + if (wf_smu_readjust) + goto readjust; + return; + } + st->ticks = st->pid.param.interval; + + rc = wf_sensor_get(sensor_slots_power, &power); + if (rc) { + printk(KERN_WARNING "windfarm: Slots power sensor error %d\n", + rc); + wf_smu_failure_state |= FAILURE_SENSOR; + return; + } + + DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n", + FIX32TOPRINT(power)); + +#if 0 /* Check what makes a good overtemp condition */ + if (power > (st->pid.param.itarget + 0x50000)) + wf_smu_failure_state |= FAILURE_OVERTEMP; +#endif + + new_setpoint = wf_pid_run(&st->pid, power); + + DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); + + if (st->setpoint == new_setpoint) + return; + st->setpoint = new_setpoint; + readjust: + if (fan_slots && wf_smu_failure_state == 0) { + rc = wf_control_set(fan_slots, st->setpoint); + if (rc) { + printk(KERN_WARNING "windfarm: Slots fan error %d\n", + rc); + wf_smu_failure_state |= FAILURE_FAN; + } + } +} + + +/* + * ****** Setup / Init / Misc ... ****** + * + */ + +static void wf_smu_tick(void) +{ + unsigned int last_failure = wf_smu_failure_state; + unsigned int new_failure; + + if (!wf_smu_started) { + DBG("wf: creating control loops !\n"); + wf_smu_create_drive_fans(); + wf_smu_create_slots_fans(); + wf_smu_create_cpu_fans(); + wf_smu_started = true; + } + + /* Skipping ticks */ + if (wf_smu_skipping && --wf_smu_skipping) + return; + + wf_smu_failure_state = 0; + if (wf_smu_drive_fans) + wf_smu_drive_fans_tick(wf_smu_drive_fans); + if (wf_smu_slots_fans) + wf_smu_slots_fans_tick(wf_smu_slots_fans); + if (wf_smu_cpu_fans) + wf_smu_cpu_fans_tick(wf_smu_cpu_fans); + + wf_smu_readjust = 0; + new_failure = wf_smu_failure_state & ~last_failure; + + /* If entering failure mode, clamp cpufreq and ramp all + * fans to full speed. + */ + if (wf_smu_failure_state && !last_failure) { + if (cpufreq_clamp) + wf_control_set_max(cpufreq_clamp); + if (fan_cpu_main) + wf_control_set_max(fan_cpu_main); + if (fan_cpu_second) + wf_control_set_max(fan_cpu_second); + if (fan_cpu_third) + wf_control_set_max(fan_cpu_third); + if (fan_hd) + wf_control_set_max(fan_hd); + if (fan_slots) + wf_control_set_max(fan_slots); + } + + /* If leaving failure mode, unclamp cpufreq and readjust + * all fans on next iteration + */ + if (!wf_smu_failure_state && last_failure) { + if (cpufreq_clamp) + wf_control_set_min(cpufreq_clamp); + wf_smu_readjust = 1; + } + + /* Overtemp condition detected, notify and start skipping a couple + * ticks to let the temperature go down + */ + if (new_failure & FAILURE_OVERTEMP) { + wf_set_overtemp(); + wf_smu_skipping = 2; + wf_smu_overtemp = true; + } + + /* We only clear the overtemp condition if overtemp is cleared + * _and_ no other failure is present. Since a sensor error will + * clear the overtemp condition (can't measure temperature) at + * the control loop levels, but we don't want to keep it clear + * here in this case + */ + if (!wf_smu_failure_state && wf_smu_overtemp) { + wf_clear_overtemp(); + wf_smu_overtemp = false; + } +} + + +static void wf_smu_new_control(struct wf_control *ct) +{ + if (wf_smu_all_controls_ok) + return; + + if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) { + if (wf_get_control(ct) == 0) + fan_cpu_main = ct; + } + + if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) { + if (wf_get_control(ct) == 0) + fan_cpu_second = ct; + } + + if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) { + if (wf_get_control(ct) == 0) + fan_cpu_third = ct; + } + + if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { + if (wf_get_control(ct) == 0) + cpufreq_clamp = ct; + } + + if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { + if (wf_get_control(ct) == 0) + fan_hd = ct; + } + + if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) { + if (wf_get_control(ct) == 0) + fan_slots = ct; + } + + if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd && + fan_slots && cpufreq_clamp) + wf_smu_all_controls_ok = 1; +} + +static void wf_smu_new_sensor(struct wf_sensor *sr) +{ + if (wf_smu_all_sensors_ok) + return; + + if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { + if (wf_get_sensor(sr) == 0) + sensor_cpu_power = sr; + } + + if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { + if (wf_get_sensor(sr) == 0) + sensor_cpu_temp = sr; + } + + if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { + if (wf_get_sensor(sr) == 0) + sensor_hd_temp = sr; + } + + if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) { + if (wf_get_sensor(sr) == 0) + sensor_slots_power = sr; + } + + if (sensor_cpu_power && sensor_cpu_temp && + sensor_hd_temp && sensor_slots_power) + wf_smu_all_sensors_ok = 1; +} + + +static int wf_smu_notify(struct notifier_block *self, + unsigned long event, void *data) +{ + switch(event) { + case WF_EVENT_NEW_CONTROL: + DBG("wf: new control %s detected\n", + ((struct wf_control *)data)->name); + wf_smu_new_control(data); + wf_smu_readjust = 1; + break; + case WF_EVENT_NEW_SENSOR: + DBG("wf: new sensor %s detected\n", + ((struct wf_sensor *)data)->name); + wf_smu_new_sensor(data); + break; + case WF_EVENT_TICK: + if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) + wf_smu_tick(); + } + + return 0; +} + +static struct notifier_block wf_smu_events = { + .notifier_call = wf_smu_notify, +}; + +static int wf_init_pm(void) +{ + printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); + + return 0; +} + +static int wf_smu_probe(struct platform_device *ddev) +{ + wf_register_client(&wf_smu_events); + + return 0; +} + +static int wf_smu_remove(struct platform_device *ddev) +{ + wf_unregister_client(&wf_smu_events); + + /* XXX We don't have yet a guarantee that our callback isn't + * in progress when returning from wf_unregister_client, so + * we add an arbitrary delay. I'll have to fix that in the core + */ + msleep(1000); + + /* Release all sensors */ + /* One more crappy race: I don't think we have any guarantee here + * that the attribute callback won't race with the sensor beeing + * disposed of, and I'm not 100% certain what best way to deal + * with that except by adding locks all over... I'll do that + * eventually but heh, who ever rmmod this module anyway ? + */ + if (sensor_cpu_power) + wf_put_sensor(sensor_cpu_power); + if (sensor_cpu_temp) + wf_put_sensor(sensor_cpu_temp); + if (sensor_hd_temp) + wf_put_sensor(sensor_hd_temp); + if (sensor_slots_power) + wf_put_sensor(sensor_slots_power); + + /* Release all controls */ + if (fan_cpu_main) + wf_put_control(fan_cpu_main); + if (fan_cpu_second) + wf_put_control(fan_cpu_second); + if (fan_cpu_third) + wf_put_control(fan_cpu_third); + if (fan_hd) + wf_put_control(fan_hd); + if (fan_slots) + wf_put_control(fan_slots); + if (cpufreq_clamp) + wf_put_control(cpufreq_clamp); + + /* Destroy control loops state structures */ + kfree(wf_smu_slots_fans); + kfree(wf_smu_drive_fans); + kfree(wf_smu_cpu_fans); + + return 0; +} + +static struct platform_driver wf_smu_driver = { + .probe = wf_smu_probe, + .remove = wf_smu_remove, + .driver = { + .name = "windfarm", + }, +}; + + +static int __init wf_smu_init(void) +{ + int rc = -ENODEV; + + if (of_machine_is_compatible("PowerMac9,1")) + rc = wf_init_pm(); + + if (rc == 0) { +#ifdef MODULE + request_module("windfarm_smu_controls"); + request_module("windfarm_smu_sensors"); + request_module("windfarm_lm75_sensor"); + request_module("windfarm_cpufreq_clamp"); + +#endif /* MODULE */ + platform_driver_register(&wf_smu_driver); + } + + return rc; +} + +static void __exit wf_smu_exit(void) +{ + + platform_driver_unregister(&wf_smu_driver); +} + + +module_init(wf_smu_init); +module_exit(wf_smu_exit); + +MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); +MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); +MODULE_LICENSE("GPL"); + +MODULE_ALIAS("platform:windfarm"); |