812 строки
21 KiB
C
812 строки
21 KiB
C
// 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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* <benh@kernel.crashing.org>
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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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#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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#include "windfarm.h"
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#include "windfarm_pid.h"
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#define VERSION "0.4"
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#undef DEBUG
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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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/* 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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static int wf_smu_mach_model; /* machine model id */
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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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/* 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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/* 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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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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* ****** System Fans Control Loop ******
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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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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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#define WF_SMU_SYS_FANS_INTERVAL 5
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#define WF_SMU_SYS_FANS_HISTORY_SIZE 2
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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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* 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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static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
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/*
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* ****** CPU Fans Control Loop ******
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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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/* 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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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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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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/* 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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/* 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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/* 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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/* 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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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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fail:
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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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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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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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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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DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
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FIX32TOPRINT(temp));
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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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new_setpoint = wf_pid_run(&st->pid, temp);
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DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
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scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
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DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
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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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}
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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
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* 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 */
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wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
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GFP_KERNEL);
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if (wf_smu_cpu_fans == NULL)
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goto fail;
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wf_smu_cpu_fans->ticks = 1;
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wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
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wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
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/* Fill PID params */
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pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
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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);
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pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
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}
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pid_param.gd = piddata->gd;
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pid_param.gp = piddata->gp;
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pid_param.gr = piddata->gr / pid_param.history_len;
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tdelta = ((s32)piddata->target_temp_delta) << 16;
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maxpow = ((s32)piddata->max_power) << 16;
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powadj = ((s32)piddata->power_adj) << 16;
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pid_param.tmax = tmax;
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pid_param.ttarget = tmax - tdelta;
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pid_param.pmaxadj = maxpow - powadj;
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pid_param.min = wf_control_get_min(fan_cpu_main);
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pid_param.max = wf_control_get_max(fan_cpu_main);
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wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
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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",
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FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
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pid_param.min, pid_param.max);
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return;
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fail:
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printk(KERN_WARNING "windfarm: CPU fan config not found\n"
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"for this machine model, max fan speed\n");
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if (cpufreq_clamp)
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wf_control_set_max(cpufreq_clamp);
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if (fan_cpu_main)
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wf_control_set_max(fan_cpu_main);
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}
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static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
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{
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s32 new_setpoint, temp, power, systarget;
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int rc;
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|
|
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 <benh@kernel.crashing.org>");
|
|
MODULE_DESCRIPTION("Thermal control logic for iMac G5");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:windfarm");
|