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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/macintosh/windfarm_pid.h
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/macintosh/windfarm_pid.h')
-rw-r--r--kernel/drivers/macintosh/windfarm_pid.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/kernel/drivers/macintosh/windfarm_pid.h b/kernel/drivers/macintosh/windfarm_pid.h
new file mode 100644
index 000000000..bbccc22d4
--- /dev/null
+++ b/kernel/drivers/macintosh/windfarm_pid.h
@@ -0,0 +1,85 @@
+/*
+ * Windfarm PowerMac thermal control. Generic PID helpers
+ *
+ * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
+ * <benh@kernel.crashing.org>
+ *
+ * Released under the term of the GNU GPL v2.
+ *
+ * This is a pair of generic PID helpers that can be used by
+ * control loops. One is the basic PID implementation, the
+ * other one is more specifically tailored to the loops used
+ * for CPU control with 2 input sample types (temp and power)
+ */
+
+/*
+ * *** Simple PID ***
+ */
+
+#define WF_PID_MAX_HISTORY 32
+
+/* This parameter array is passed to the PID algorithm. Currently,
+ * we don't support changing parameters on the fly as it's not needed
+ * but could be implemented (with necessary adjustment of the history
+ * buffer
+ */
+struct wf_pid_param {
+ int interval; /* Interval between samples in seconds */
+ int history_len; /* Size of history buffer */
+ int additive; /* 1: target relative to previous value */
+ s32 gd, gp, gr; /* PID gains */
+ s32 itarget; /* PID input target */
+ s32 min,max; /* min and max target values */
+};
+
+struct wf_pid_state {
+ int first; /* first run of the loop */
+ int index; /* index of current sample */
+ s32 target; /* current target value */
+ s32 samples[WF_PID_MAX_HISTORY]; /* samples history buffer */
+ s32 errors[WF_PID_MAX_HISTORY]; /* error history buffer */
+
+ struct wf_pid_param param;
+};
+
+extern void wf_pid_init(struct wf_pid_state *st, struct wf_pid_param *param);
+extern s32 wf_pid_run(struct wf_pid_state *st, s32 sample);
+
+
+/*
+ * *** CPU PID ***
+ */
+
+#define WF_CPU_PID_MAX_HISTORY 32
+
+/* This parameter array is passed to the CPU PID algorithm. Currently,
+ * we don't support changing parameters on the fly as it's not needed
+ * but could be implemented (with necessary adjustment of the history
+ * buffer
+ */
+struct wf_cpu_pid_param {
+ int interval; /* Interval between samples in seconds */
+ int history_len; /* Size of history buffer */
+ s32 gd, gp, gr; /* PID gains */
+ s32 pmaxadj; /* PID max power adjust */
+ s32 ttarget; /* PID input target */
+ s32 tmax; /* PID input max */
+ s32 min,max; /* min and max target values */
+};
+
+struct wf_cpu_pid_state {
+ int first; /* first run of the loop */
+ int index; /* index of current power */
+ int tindex; /* index of current temp */
+ s32 target; /* current target value */
+ s32 last_delta; /* last Tactual - Ttarget */
+ s32 powers[WF_PID_MAX_HISTORY]; /* power history buffer */
+ s32 errors[WF_PID_MAX_HISTORY]; /* error history buffer */
+ s32 temps[2]; /* temp. history buffer */
+
+ struct wf_cpu_pid_param param;
+};
+
+extern void wf_cpu_pid_init(struct wf_cpu_pid_state *st,
+ struct wf_cpu_pid_param *param);
+extern s32 wf_cpu_pid_run(struct wf_cpu_pid_state *st, s32 power, s32 temp);