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811 lines
21 KiB
811 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Windfarm PowerMac thermal control. iMac G5 |
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* |
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* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. |
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* <[email protected]> |
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* |
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* The algorithm used is the PID control algorithm, used the same |
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* way the published Darwin code does, using the same values that |
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* are present in the Darwin 8.2 snapshot property lists (note however |
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* that none of the code has been re-used, it's a complete re-implementation |
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* |
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* The various control loops found in Darwin config file are: |
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* |
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* PowerMac8,1 and PowerMac8,2 |
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* =========================== |
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* |
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* System Fans control loop. Different based on models. In addition to the |
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* usual PID algorithm, the control loop gets 2 additional pairs of linear |
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* scaling factors (scale/offsets) expressed as 4.12 fixed point values |
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* signed offset, unsigned scale) |
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* |
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* The targets are modified such as: |
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* - the linked control (second control) gets the target value as-is |
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* (typically the drive fan) |
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* - the main control (first control) gets the target value scaled with |
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* the first pair of factors, and is then modified as below |
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* - the value of the target of the CPU Fan control loop is retrieved, |
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* scaled with the second pair of factors, and the max of that and |
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* the scaled target is applied to the main control. |
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* |
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* # model_id: 2 |
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* controls : system-fan, drive-bay-fan |
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* sensors : hd-temp |
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* PID params : G_d = 0x15400000 |
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* G_p = 0x00200000 |
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* G_r = 0x000002fd |
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* History = 2 entries |
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* Input target = 0x3a0000 |
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* Interval = 5s |
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* linear-factors : offset = 0xff38 scale = 0x0ccd |
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* offset = 0x0208 scale = 0x07ae |
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* |
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* # model_id: 3 |
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* controls : system-fan, drive-bay-fan |
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* sensors : hd-temp |
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* PID params : G_d = 0x08e00000 |
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* G_p = 0x00566666 |
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* G_r = 0x0000072b |
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* History = 2 entries |
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* Input target = 0x350000 |
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* Interval = 5s |
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* linear-factors : offset = 0xff38 scale = 0x0ccd |
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* offset = 0x0000 scale = 0x0000 |
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* |
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* # model_id: 5 |
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* controls : system-fan |
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* sensors : hd-temp |
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* PID params : G_d = 0x15400000 |
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* G_p = 0x00233333 |
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* G_r = 0x000002fd |
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* History = 2 entries |
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* Input target = 0x3a0000 |
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* Interval = 5s |
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* linear-factors : offset = 0x0000 scale = 0x1000 |
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* offset = 0x0091 scale = 0x0bae |
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* |
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* CPU Fan control loop. The loop is identical for all models. it |
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* has an additional pair of scaling factor. This is used to scale the |
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* systems fan control loop target result (the one before it gets scaled |
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* by the System Fans control loop itself). Then, the max value of the |
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* calculated target value and system fan value is sent to the fans |
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* |
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* controls : cpu-fan |
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* sensors : cpu-temp cpu-power |
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* PID params : From SMU sdb partition |
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* linear-factors : offset = 0xfb50 scale = 0x1000 |
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* |
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* CPU Slew control loop. Not implemented. The cpufreq driver in linux is |
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* completely separate for now, though we could find a way to link it, either |
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* as a client reacting to overtemp notifications, or directling monitoring |
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* the CPU temperature |
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* |
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* WARNING ! The CPU control loop requires the CPU tmax for the current |
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* operating point. However, we currently are completely separated from |
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* the cpufreq driver and thus do not know what the current operating |
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* point is. Fortunately, we also do not have any hardware supporting anything |
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* but operating point 0 at the moment, thus we just peek that value directly |
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* from the SDB partition. If we ever end up with actually slewing the system |
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* clock and thus changing operating points, we'll have to find a way to |
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* communicate with the CPU freq driver; |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/spinlock.h> |
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#include <linux/wait.h> |
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#include <linux/kmod.h> |
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#include <linux/device.h> |
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#include <linux/platform_device.h> |
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#include <asm/prom.h> |
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#include <asm/machdep.h> |
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#include <asm/io.h> |
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#include <asm/sections.h> |
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#include <asm/smu.h> |
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|
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#include "windfarm.h" |
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#include "windfarm_pid.h" |
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|
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#define VERSION "0.4" |
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|
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#undef DEBUG |
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|
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#ifdef DEBUG |
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#define DBG(args...) printk(args) |
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#else |
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#define DBG(args...) do { } while(0) |
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#endif |
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|
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/* define this to force CPU overtemp to 74 degree, useful for testing |
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* the overtemp code |
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*/ |
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#undef HACKED_OVERTEMP |
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|
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static int wf_smu_mach_model; /* machine model id */ |
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|
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/* Controls & sensors */ |
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static struct wf_sensor *sensor_cpu_power; |
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static struct wf_sensor *sensor_cpu_temp; |
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static struct wf_sensor *sensor_hd_temp; |
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static struct wf_control *fan_cpu_main; |
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static struct wf_control *fan_hd; |
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static struct wf_control *fan_system; |
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static struct wf_control *cpufreq_clamp; |
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|
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/* Set to kick the control loop into life */ |
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static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok; |
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static bool wf_smu_started; |
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|
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/* Failure handling.. could be nicer */ |
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#define FAILURE_FAN 0x01 |
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#define FAILURE_SENSOR 0x02 |
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#define FAILURE_OVERTEMP 0x04 |
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|
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static unsigned int wf_smu_failure_state; |
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static int wf_smu_readjust, wf_smu_skipping; |
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static bool wf_smu_overtemp; |
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|
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/* |
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* ****** System Fans Control Loop ****** |
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* |
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*/ |
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|
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/* Parameters for the System Fans control loop. Parameters |
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* not in this table such as interval, history size, ... |
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* are common to all versions and thus hard coded for now. |
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*/ |
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struct wf_smu_sys_fans_param { |
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int model_id; |
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s32 itarget; |
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s32 gd, gp, gr; |
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|
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s16 offset0; |
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u16 scale0; |
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s16 offset1; |
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u16 scale1; |
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}; |
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|
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#define WF_SMU_SYS_FANS_INTERVAL 5 |
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#define WF_SMU_SYS_FANS_HISTORY_SIZE 2 |
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|
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/* State data used by the system fans control loop |
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*/ |
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struct wf_smu_sys_fans_state { |
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int ticks; |
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s32 sys_setpoint; |
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s32 hd_setpoint; |
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s16 offset0; |
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u16 scale0; |
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s16 offset1; |
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u16 scale1; |
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struct wf_pid_state pid; |
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}; |
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|
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/* |
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* Configs for SMU System Fan control loop |
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*/ |
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static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = { |
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/* Model ID 2 */ |
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{ |
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.model_id = 2, |
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.itarget = 0x3a0000, |
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.gd = 0x15400000, |
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.gp = 0x00200000, |
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.gr = 0x000002fd, |
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.offset0 = 0xff38, |
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.scale0 = 0x0ccd, |
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.offset1 = 0x0208, |
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.scale1 = 0x07ae, |
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}, |
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/* Model ID 3 */ |
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{ |
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.model_id = 3, |
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.itarget = 0x350000, |
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.gd = 0x08e00000, |
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.gp = 0x00566666, |
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.gr = 0x0000072b, |
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.offset0 = 0xff38, |
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.scale0 = 0x0ccd, |
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.offset1 = 0x0000, |
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.scale1 = 0x0000, |
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}, |
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/* Model ID 5 */ |
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{ |
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.model_id = 5, |
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.itarget = 0x3a0000, |
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.gd = 0x15400000, |
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.gp = 0x00233333, |
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.gr = 0x000002fd, |
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.offset0 = 0x0000, |
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.scale0 = 0x1000, |
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.offset1 = 0x0091, |
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.scale1 = 0x0bae, |
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}, |
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}; |
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#define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params) |
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|
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static struct wf_smu_sys_fans_state *wf_smu_sys_fans; |
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|
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/* |
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* ****** CPU Fans Control Loop ****** |
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* |
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*/ |
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|
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|
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#define WF_SMU_CPU_FANS_INTERVAL 1 |
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#define WF_SMU_CPU_FANS_MAX_HISTORY 16 |
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#define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000 |
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#define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50 |
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|
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/* State data used by the cpu fans control loop |
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*/ |
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struct wf_smu_cpu_fans_state { |
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int ticks; |
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s32 cpu_setpoint; |
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s32 scale; |
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s32 offset; |
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struct wf_cpu_pid_state pid; |
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}; |
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|
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static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; |
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/* |
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* ***** Implementation ***** |
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* |
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*/ |
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|
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static void wf_smu_create_sys_fans(void) |
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{ |
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struct wf_smu_sys_fans_param *param = NULL; |
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struct wf_pid_param pid_param; |
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int i; |
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|
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/* First, locate the params for this model */ |
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for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++) |
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if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) { |
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param = &wf_smu_sys_all_params[i]; |
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break; |
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} |
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|
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/* No params found, put fans to max */ |
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if (param == NULL) { |
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printk(KERN_WARNING "windfarm: System fan config not found " |
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"for this machine model, max fan speed\n"); |
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goto fail; |
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} |
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|
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/* Alloc & initialize state */ |
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wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state), |
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GFP_KERNEL); |
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if (wf_smu_sys_fans == NULL) { |
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printk(KERN_WARNING "windfarm: Memory allocation error" |
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" max fan speed\n"); |
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goto fail; |
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} |
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wf_smu_sys_fans->ticks = 1; |
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wf_smu_sys_fans->scale0 = param->scale0; |
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wf_smu_sys_fans->offset0 = param->offset0; |
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wf_smu_sys_fans->scale1 = param->scale1; |
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wf_smu_sys_fans->offset1 = param->offset1; |
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|
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/* Fill PID params */ |
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pid_param.gd = param->gd; |
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pid_param.gp = param->gp; |
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pid_param.gr = param->gr; |
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pid_param.interval = WF_SMU_SYS_FANS_INTERVAL; |
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pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE; |
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pid_param.itarget = param->itarget; |
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pid_param.min = wf_control_get_min(fan_system); |
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pid_param.max = wf_control_get_max(fan_system); |
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if (fan_hd) { |
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pid_param.min = |
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max(pid_param.min, wf_control_get_min(fan_hd)); |
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pid_param.max = |
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min(pid_param.max, wf_control_get_max(fan_hd)); |
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} |
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wf_pid_init(&wf_smu_sys_fans->pid, &pid_param); |
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|
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DBG("wf: System Fan control initialized.\n"); |
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DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", |
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FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max); |
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return; |
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|
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fail: |
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|
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if (fan_system) |
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wf_control_set_max(fan_system); |
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if (fan_hd) |
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wf_control_set_max(fan_hd); |
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} |
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|
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static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st) |
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{ |
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s32 new_setpoint, temp, scaled, cputarget; |
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int rc; |
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|
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if (--st->ticks != 0) { |
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if (wf_smu_readjust) |
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goto readjust; |
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return; |
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} |
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st->ticks = WF_SMU_SYS_FANS_INTERVAL; |
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|
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rc = wf_sensor_get(sensor_hd_temp, &temp); |
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if (rc) { |
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printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", |
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rc); |
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wf_smu_failure_state |= FAILURE_SENSOR; |
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return; |
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} |
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|
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DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n", |
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FIX32TOPRINT(temp)); |
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|
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if (temp > (st->pid.param.itarget + 0x50000)) |
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wf_smu_failure_state |= FAILURE_OVERTEMP; |
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|
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new_setpoint = wf_pid_run(&st->pid, temp); |
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|
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DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); |
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|
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scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0; |
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|
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DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled); |
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|
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cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0; |
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cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1; |
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scaled = max(scaled, cputarget); |
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scaled = max(scaled, st->pid.param.min); |
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scaled = min(scaled, st->pid.param.max); |
|
|
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DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled); |
|
|
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if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint) |
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return; |
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st->sys_setpoint = scaled; |
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st->hd_setpoint = new_setpoint; |
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readjust: |
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if (fan_system && wf_smu_failure_state == 0) { |
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rc = wf_control_set(fan_system, st->sys_setpoint); |
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if (rc) { |
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printk(KERN_WARNING "windfarm: Sys fan error %d\n", |
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rc); |
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wf_smu_failure_state |= FAILURE_FAN; |
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} |
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} |
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if (fan_hd && wf_smu_failure_state == 0) { |
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rc = wf_control_set(fan_hd, st->hd_setpoint); |
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if (rc) { |
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printk(KERN_WARNING "windfarm: HD fan error %d\n", |
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rc); |
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wf_smu_failure_state |= FAILURE_FAN; |
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} |
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} |
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} |
|
|
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static void wf_smu_create_cpu_fans(void) |
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{ |
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struct wf_cpu_pid_param pid_param; |
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const struct smu_sdbp_header *hdr; |
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struct smu_sdbp_cpupiddata *piddata; |
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struct smu_sdbp_fvt *fvt; |
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s32 tmax, tdelta, maxpow, powadj; |
|
|
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/* First, locate the PID params in SMU SBD */ |
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hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); |
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if (hdr == 0) { |
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printk(KERN_WARNING "windfarm: CPU PID fan config not found " |
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"max fan speed\n"); |
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goto fail; |
|
} |
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piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; |
|
|
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/* Get the FVT params for operating point 0 (the only supported one |
|
* for now) in order to get tmax |
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*/ |
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hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); |
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if (hdr) { |
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fvt = (struct smu_sdbp_fvt *)&hdr[1]; |
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tmax = ((s32)fvt->maxtemp) << 16; |
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} else |
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tmax = 0x5e0000; /* 94 degree default */ |
|
|
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/* 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; |
|
|
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wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE; |
|
wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET; |
|
|
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/* Fill PID params */ |
|
pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; |
|
pid_param.history_len = piddata->history_len; |
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if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { |
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printk(KERN_WARNING "windfarm: History size overflow on " |
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"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; |
|
|
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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"); |
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DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", |
|
FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), |
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pid_param.min, pid_param.max); |
|
|
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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); |
|
} |
|
|
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static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) |
|
{ |
|
s32 new_setpoint, temp, power, systarget; |
|
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); |
|
|
|
systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0; |
|
systarget = ((((s64)systarget) * (s64)st->scale) >> 12) |
|
+ st->offset; |
|
new_setpoint = max(new_setpoint, systarget); |
|
new_setpoint = max(new_setpoint, st->pid.param.min); |
|
new_setpoint = min(new_setpoint, st->pid.param.max); |
|
|
|
DBG("wf_smu: adjusted 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; |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* ****** 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_sys_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_sys_fans) |
|
wf_smu_sys_fans_tick(wf_smu_sys_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_system) |
|
wf_control_set_max(fan_system); |
|
if (fan_cpu_main) |
|
wf_control_set_max(fan_cpu_main); |
|
if (fan_hd) |
|
wf_control_set_max(fan_hd); |
|
} |
|
|
|
/* 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-fan")) { |
|
if (wf_get_control(ct) == 0) |
|
fan_cpu_main = ct; |
|
} |
|
|
|
if (fan_system == NULL && !strcmp(ct->name, "system-fan")) { |
|
if (wf_get_control(ct) == 0) |
|
fan_system = ct; |
|
} |
|
|
|
if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { |
|
if (wf_get_control(ct) == 0) |
|
cpufreq_clamp = ct; |
|
} |
|
|
|
/* Darwin property list says the HD fan is only for model ID |
|
* 0, 1, 2 and 3 |
|
*/ |
|
|
|
if (wf_smu_mach_model > 3) { |
|
if (fan_system && fan_cpu_main && cpufreq_clamp) |
|
wf_smu_all_controls_ok = 1; |
|
return; |
|
} |
|
|
|
if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { |
|
if (wf_get_control(ct) == 0) |
|
fan_hd = ct; |
|
} |
|
|
|
if (fan_system && fan_hd && fan_cpu_main && 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_cpu_power && sensor_cpu_temp && sensor_hd_temp) |
|
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) |
|
{ |
|
const struct smu_sdbp_header *hdr; |
|
|
|
hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); |
|
if (hdr != 0) { |
|
struct smu_sdbp_sensortree *st = |
|
(struct smu_sdbp_sensortree *)&hdr[1]; |
|
wf_smu_mach_model = st->model_id; |
|
} |
|
|
|
printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n", |
|
wf_smu_mach_model); |
|
|
|
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); |
|
|
|
/* Release all controls */ |
|
if (fan_cpu_main) |
|
wf_put_control(fan_cpu_main); |
|
if (fan_hd) |
|
wf_put_control(fan_hd); |
|
if (fan_system) |
|
wf_put_control(fan_system); |
|
if (cpufreq_clamp) |
|
wf_put_control(cpufreq_clamp); |
|
|
|
/* Destroy control loops state structures */ |
|
kfree(wf_smu_sys_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("PowerMac8,1") || |
|
of_machine_is_compatible("PowerMac8,2")) |
|
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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Thermal control logic for iMac G5"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("platform:windfarm");
|
|
|