176 lines
4.1 KiB
C
176 lines
4.1 KiB
C
/*
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* omap-pm-noop.c - OMAP power management interface - dummy version
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*
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* This code implements the OMAP power management interface to
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* drivers, CPUIdle, CPUFreq, and DSP Bridge. It is strictly for
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* debug/demonstration use, as it does nothing but printk() whenever a
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* function is called (when DEBUG is defined, below)
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*
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* Copyright (C) 2008-2009 Texas Instruments, Inc.
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* Copyright (C) 2008-2009 Nokia Corporation
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* Paul Walmsley
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*
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* Interface developed by (in alphabetical order):
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* Karthik Dasu, Tony Lindgren, Rajendra Nayak, Sakari Poussa, Veeramanikandan
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* Raju, Anand Sawant, Igor Stoppa, Paul Walmsley, Richard Woodruff
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*/
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#undef DEBUG
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#include <linux/init.h>
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#include <linux/cpufreq.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include "omap_device.h"
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#include "omap-pm.h"
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static bool off_mode_enabled;
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static int dummy_context_loss_counter;
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/*
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* Device-driver-originated constraints (via board-*.c files)
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*/
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int omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t)
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{
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if (!dev || t < -1) {
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WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
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return -EINVAL;
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}
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if (t == -1)
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pr_debug("OMAP PM: remove max MPU wakeup latency constraint: dev %s\n",
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dev_name(dev));
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else
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pr_debug("OMAP PM: add max MPU wakeup latency constraint: dev %s, t = %ld usec\n",
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dev_name(dev), t);
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/*
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* For current Linux, this needs to map the MPU to a
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* powerdomain, then go through the list of current max lat
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* constraints on the MPU and find the smallest. If
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* the latency constraint has changed, the code should
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* recompute the state to enter for the next powerdomain
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* state.
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*
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* TI CDP code can call constraint_set here.
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*/
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return 0;
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}
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int omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r)
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{
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if (!dev || (agent_id != OCP_INITIATOR_AGENT &&
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agent_id != OCP_TARGET_AGENT)) {
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WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
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return -EINVAL;
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}
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if (r == 0)
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pr_debug("OMAP PM: remove min bus tput constraint: dev %s for agent_id %d\n",
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dev_name(dev), agent_id);
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else
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pr_debug("OMAP PM: add min bus tput constraint: dev %s for agent_id %d: rate %ld KiB\n",
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dev_name(dev), agent_id, r);
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/*
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* This code should model the interconnect and compute the
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* required clock frequency, convert that to a VDD2 OPP ID, then
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* set the VDD2 OPP appropriately.
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*
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* TI CDP code can call constraint_set here on the VDD2 OPP.
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*/
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return 0;
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}
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/*
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* DSP Bridge-specific constraints
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*/
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/**
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* omap_pm_enable_off_mode - notify OMAP PM that off-mode is enabled
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*
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* Intended for use only by OMAP PM core code to notify this layer
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* that off mode has been enabled.
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*/
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void omap_pm_enable_off_mode(void)
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{
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off_mode_enabled = true;
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}
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/**
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* omap_pm_disable_off_mode - notify OMAP PM that off-mode is disabled
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*
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* Intended for use only by OMAP PM core code to notify this layer
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* that off mode has been disabled.
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*/
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void omap_pm_disable_off_mode(void)
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{
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off_mode_enabled = false;
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}
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/*
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* Device context loss tracking
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*/
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#ifdef CONFIG_ARCH_OMAP2PLUS
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int omap_pm_get_dev_context_loss_count(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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int count;
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if (WARN_ON(!dev))
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return -ENODEV;
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if (dev->pm_domain == &omap_device_pm_domain) {
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count = omap_device_get_context_loss_count(pdev);
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} else {
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WARN_ONCE(off_mode_enabled, "omap_pm: using dummy context loss counter; device %s should be converted to omap_device",
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dev_name(dev));
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count = dummy_context_loss_counter;
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if (off_mode_enabled) {
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count++;
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/*
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* Context loss count has to be a non-negative value.
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* Clear the sign bit to get a value range from 0 to
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* INT_MAX.
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*/
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count &= INT_MAX;
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dummy_context_loss_counter = count;
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}
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}
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pr_debug("OMAP PM: context loss count for dev %s = %d\n",
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dev_name(dev), count);
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return count;
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}
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#else
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int omap_pm_get_dev_context_loss_count(struct device *dev)
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{
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return dummy_context_loss_counter;
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}
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#endif
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/* Should be called before clk framework init */
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int __init omap_pm_if_early_init(void)
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{
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return 0;
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}
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/* Must be called after clock framework is initialized */
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int __init omap_pm_if_init(void)
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{
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return 0;
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}
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