diff options
Diffstat (limited to 'nuttx/drivers/power/pm_update.c')
-rw-r--r-- | nuttx/drivers/power/pm_update.c | 334 |
1 files changed, 0 insertions, 334 deletions
diff --git a/nuttx/drivers/power/pm_update.c b/nuttx/drivers/power/pm_update.c deleted file mode 100644 index 4b6b58c55..000000000 --- a/nuttx/drivers/power/pm_update.c +++ /dev/null @@ -1,334 +0,0 @@ -/**************************************************************************** - * drivers/power/pm_update.c - * - * Copyright (C) 2011-2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <assert.h> - -#include <nuttx/power/pm.h> -#include <nuttx/wqueue.h> - -#include "pm_internal.h" - -#ifdef CONFIG_PM - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Types - ****************************************************************************/ - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -/**************************************************************************** - * Private Data - ****************************************************************************/ -/* CONFIG_PM_MEMORY is the total number of time slices (including the current - * time slice. The histor or previous values is then CONFIG_PM_MEMORY-1. - */ - -#if CONFIG_PM_MEMORY > 1 -static const int16_t g_pmcoeffs[CONFIG_PM_MEMORY-1] = -{ - CONFIG_PM_COEF1 -#if CONFIG_PM_MEMORY > 2 - , CONFIG_PM_COEF2 -#endif -#if CONFIG_PM_MEMORY > 3 - , CONFIG_PM_COEF3 -#endif -#if CONFIG_PM_MEMORY > 4 - , CONFIG_PM_COEF4 -#endif -#if CONFIG_PM_MEMORY > 5 - , CONFIG_PM_COEF5 -#endif -#if CONFIG_PM_MEMORY > 6 -# warning "This logic needs to be extended" -#endif -}; -#endif - -/* Threshold activity values to enter into the next lower power consumption - * state. Indexing is next state 0:IDLE, 1:STANDBY, 2:SLEEP. - */ - -static const int16_t g_pmenterthresh[3] = -{ - CONFIG_PM_IDLEENTER_THRESH, - CONFIG_PM_STANDBYENTER_THRESH, - CONFIG_PM_SLEEPENTER_THRESH -}; - -/* Threshold activity values to leave the current low power consdumption - * state. Indexing is current state 0:IDLE, 1: STANDBY, 2: SLEEP. - */ - -static const int16_t g_pmexitthresh[3] = -{ - CONFIG_PM_IDLEEXIT_THRESH, - CONFIG_PM_STANDBYEXIT_THRESH, - CONFIG_PM_SLEEPEXIT_THRESH -}; - -/* Threshold time slice count to enter the next low power consdumption - * state. Indexing is next state 0:IDLE, 1: STANDBY, 2: SLEEP. - */ - -static const uint16_t g_pmcount[3] = -{ - CONFIG_PM_IDLEENTER_COUNT, - CONFIG_PM_STANDBYENTER_COUNT, - CONFIG_PM_SLEEPENTER_COUNT -}; - -/**************************************************************************** - * Public Data - ****************************************************************************/ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: pm_worker - * - * Description: - * This worker function is queue at the end of a time slice in order to - * update driver activity metrics and recommended states. - * - * Input Parameters: - * arg - The value of the activity accumulator at the end of the time - * slice. - * - * Returned Value: - * None. - * - * Assumptions: - * This function runs on the worker thread. - * - ****************************************************************************/ - -void pm_worker(FAR void *arg) -{ - int16_t accum = (int16_t)((intptr_t)arg); - int32_t Y; - int index; - -#if CONFIG_PM_MEMORY > 1 - int32_t denom; - int i, j; - - /* We won't bother to do anything until we have accumulated - * CONFIG_PM_MEMORY-1 samples. - */ - - if (g_pmglobals.mcnt < CONFIG_PM_MEMORY-1) - { - g_pmglobals.memory[g_pmglobals.mcnt] = accum; - g_pmglobals.mcnt++; - return; - } - - /* The averaging algorithm is simply: Y = (An*X + SUM(Ai*Yi))/SUM(Aj), where - * i = 1..n-1 and j= 1..n, n is the length of the "memory", Ai is the - * weight applied to each value, and X is the current activity. - * - * CONFIG_PM_MEMORY provides the memory for the algorithm. Default: 2 - * CONFIG_PM_COEFn provides weight for each sample. Default: 1 - * - * First, calclate Y = An*X - */ - - Y = CONFIG_PM_COEFN * accum; - denom = CONFIG_PM_COEFN; - - /* Then calculate Y += SUM(Ai*Yi), i = 1..n-1. The oldest sample will - * reside at g_pmglobals.mndx (and this is the value that we will overwrite - * with the new value). - */ - - for (i = 0, j = g_pmglobals.mndx; i < CONFIG_PM_MEMORY-1; i++, j++) - { - if (j >= CONFIG_PM_MEMORY-1) - { - j = 0; - } - - Y += g_pmcoeffs[i] * g_pmglobals.memory[j]; - denom += g_pmcoeffs[i]; - } - - /* Compute and save the new activity value */ - - Y /= denom; - g_pmglobals.memory[g_pmglobals.mndx] = Y; - g_pmglobals.mndx++; - if (g_pmglobals.mndx >= CONFIG_PM_MEMORY-1) - { - g_pmglobals.mndx = 0; - } - -#else - - /* No smoothing */ - - Y = accum; - -#endif - - /* First check if increased activity should cause us to return to the - * normal operating state. This would be unlikely for the lowest power - * consumption states because the CPU is probably asleep. However this - * probably does apply for the IDLE state. - */ - - if (g_pmglobals.state > PM_NORMAL) - { - /* Get the table index for the current state (which will be the - * current state minus one) - */ - - index = g_pmglobals.state - 1; - - /* Has the threshold to return to normal power consumption state been - * exceeded? - */ - - if (Y > g_pmexitthresh[index]) - { - /* Yes... reset the count and recommend the normal state. */ - - g_pmglobals.thrcnt = 0; - g_pmglobals.recommended = PM_NORMAL; - return; - } - } - - /* Now, compare this new activity level to the thresholds and counts for - * the next lower power consumption state. If we are already in the SLEEP - * state, then there is nothing more to be done (in fact, I would be - * surprised to be executing!). - */ - - if (g_pmglobals.state < PM_SLEEP) - { - unsigned int nextstate; - - /* Get the next state and the table index for the next state (which will - * be the current state) - */ - - index = g_pmglobals.state; - nextstate = g_pmglobals.state + 1; - - /* Has the threshold to enter the next lower power consumption state - * been exceeded? - */ - - if (Y > g_pmenterthresh[index]) - { - /* No... reset the count and recommend the current state */ - - g_pmglobals.thrcnt = 0; - g_pmglobals.recommended = g_pmglobals.state; - } - - /* Yes.. have we already recommended this state? If so, do nothing */ - - else if (g_pmglobals.recommended < nextstate) - { - /* No.. increment the count. Has is passed the the count required - * for a state transition? - */ - - if (++g_pmglobals.thrcnt >= g_pmcount[index]) - { - /* Yes, recommend the new state and set up for the next - * transition. - */ - - g_pmglobals.thrcnt = 0; - g_pmglobals.recommended = nextstate; - } - } - } -} - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: pm_update - * - * Description: - * This internal function is called at the end of a time slice in order to - * update driver activity metrics and recommended states. - * - * Input Parameters: - * accum - The value of the activity accumulator at the end of the time - * slice. - * - * Returned Value: - * None. - * - * Assumptions: - * This function may be called from a driver, perhaps even at the interrupt - * level. It may also be called from the IDLE loop at the lowest possible - * priority level. To reconcile these various conditions, all work is - * performed on the worker thread at a user-selectable priority. This will - * also serialize all of the updates and eliminate any need for additional - * protection. - * - ****************************************************************************/ - -void pm_update(int16_t accum) -{ - /* The work will be performed on the worker thread */ - - DEBUGASSERT(g_pmglobals.work.worker == NULL); - (void)work_queue(HPWORK, &g_pmglobals.work, pm_worker, (FAR void*)((intptr_t)accum), 0); -} - -#endif /* CONFIG_PM */ |