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84 lines
2.7 KiB
84 lines
2.7 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Windfarm PowerMac thermal control. Generic PID helpers |
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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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* This is a pair of generic PID helpers that can be used by |
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* control loops. One is the basic PID implementation, the |
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* other one is more specifically tailored to the loops used |
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* for CPU control with 2 input sample types (temp and power) |
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*/ |
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/* |
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* *** Simple PID *** |
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*/ |
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#define WF_PID_MAX_HISTORY 32 |
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/* This parameter array is passed to the PID algorithm. Currently, |
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* we don't support changing parameters on the fly as it's not needed |
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* but could be implemented (with necessary adjustment of the history |
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* buffer |
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*/ |
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struct wf_pid_param { |
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int interval; /* Interval between samples in seconds */ |
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int history_len; /* Size of history buffer */ |
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int additive; /* 1: target relative to previous value */ |
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s32 gd, gp, gr; /* PID gains */ |
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s32 itarget; /* PID input target */ |
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s32 min,max; /* min and max target values */ |
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}; |
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struct wf_pid_state { |
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int first; /* first run of the loop */ |
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int index; /* index of current sample */ |
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s32 target; /* current target value */ |
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s32 samples[WF_PID_MAX_HISTORY]; /* samples history buffer */ |
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s32 errors[WF_PID_MAX_HISTORY]; /* error history buffer */ |
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struct wf_pid_param param; |
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}; |
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extern void wf_pid_init(struct wf_pid_state *st, struct wf_pid_param *param); |
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extern s32 wf_pid_run(struct wf_pid_state *st, s32 sample); |
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/* |
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* *** CPU PID *** |
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*/ |
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#define WF_CPU_PID_MAX_HISTORY 32 |
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/* This parameter array is passed to the CPU PID algorithm. Currently, |
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* we don't support changing parameters on the fly as it's not needed |
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* but could be implemented (with necessary adjustment of the history |
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* buffer |
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*/ |
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struct wf_cpu_pid_param { |
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int interval; /* Interval between samples in seconds */ |
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int history_len; /* Size of history buffer */ |
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s32 gd, gp, gr; /* PID gains */ |
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s32 pmaxadj; /* PID max power adjust */ |
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s32 ttarget; /* PID input target */ |
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s32 tmax; /* PID input max */ |
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s32 min,max; /* min and max target values */ |
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}; |
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struct wf_cpu_pid_state { |
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int first; /* first run of the loop */ |
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int index; /* index of current power */ |
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int tindex; /* index of current temp */ |
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s32 target; /* current target value */ |
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s32 last_delta; /* last Tactual - Ttarget */ |
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s32 powers[WF_PID_MAX_HISTORY]; /* power history buffer */ |
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s32 errors[WF_PID_MAX_HISTORY]; /* error history buffer */ |
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s32 temps[2]; /* temp. history buffer */ |
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struct wf_cpu_pid_param param; |
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}; |
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extern void wf_cpu_pid_init(struct wf_cpu_pid_state *st, |
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struct wf_cpu_pid_param *param); |
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extern s32 wf_cpu_pid_run(struct wf_cpu_pid_state *st, s32 power, s32 temp);
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