161 lines
5.9 KiB
C
161 lines
5.9 KiB
C
/*
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* omap-pm.h - OMAP power management interface
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*
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* Copyright (C) 2008-2010 Texas Instruments, Inc.
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* Copyright (C) 2008-2010 Nokia Corporation
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* Paul Walmsley
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*
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* Interface developed by (in alphabetical order): Karthik Dasu, Jouni
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* Högander, Tony Lindgren, Rajendra Nayak, Sakari Poussa,
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* Veeramanikandan Raju, Anand Sawant, Igor Stoppa, Paul Walmsley,
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* Richard Woodruff
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*/
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#ifndef ASM_ARM_ARCH_OMAP_OMAP_PM_H
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#define ASM_ARM_ARCH_OMAP_OMAP_PM_H
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#include <linux/device.h>
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#include <linux/cpufreq.h>
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#include <linux/clk.h>
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#include <linux/pm_opp.h>
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/*
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* agent_id values for use with omap_pm_set_min_bus_tput():
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*
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* OCP_INITIATOR_AGENT is only valid for devices that can act as
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* initiators -- it represents the device's L3 interconnect
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* connection. OCP_TARGET_AGENT represents the device's L4
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* interconnect connection.
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*/
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#define OCP_TARGET_AGENT 1
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#define OCP_INITIATOR_AGENT 2
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/**
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* omap_pm_if_early_init - OMAP PM init code called before clock fw init
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* @mpu_opp_table: array ptr to struct omap_opp for MPU
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* @dsp_opp_table: array ptr to struct omap_opp for DSP
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* @l3_opp_table : array ptr to struct omap_opp for CORE
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*
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* Initialize anything that must be configured before the clock
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* framework starts. The "_if_" is to avoid name collisions with the
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* PM idle-loop code.
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*/
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int __init omap_pm_if_early_init(void);
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/**
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* omap_pm_if_init - OMAP PM init code called after clock fw init
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*
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* The main initialization code. OPP tables are passed in here. The
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* "_if_" is to avoid name collisions with the PM idle-loop code.
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*/
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int __init omap_pm_if_init(void);
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/*
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* Device-driver-originated constraints (via board-*.c files, platform_data)
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*/
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/**
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* omap_pm_set_max_mpu_wakeup_lat - set the maximum MPU wakeup latency
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* @dev: struct device * requesting the constraint
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* @t: maximum MPU wakeup latency in microseconds
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*
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* Request that the maximum interrupt latency for the MPU to be no
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* greater than @t microseconds. "Interrupt latency" in this case is
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* defined as the elapsed time from the occurrence of a hardware or
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* timer interrupt to the time when the device driver's interrupt
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* service routine has been entered by the MPU.
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*
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* It is intended that underlying PM code will use this information to
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* determine what power state to put the MPU powerdomain into, and
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* possibly the CORE powerdomain as well, since interrupt handling
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* code currently runs from SDRAM. Advanced PM or board*.c code may
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* also configure interrupt controller priorities, OCP bus priorities,
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* CPU speed(s), etc.
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*
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* This function will not affect device wakeup latency, e.g., time
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* elapsed from when a device driver enables a hardware device with
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* clk_enable(), to when the device is ready for register access or
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* other use. To control this device wakeup latency, use
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* omap_pm_set_max_dev_wakeup_lat()
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*
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* Multiple calls to omap_pm_set_max_mpu_wakeup_lat() will replace the
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* previous t value. To remove the latency target for the MPU, call
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* with t = -1.
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*
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* XXX This constraint will be deprecated soon in favor of the more
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* general omap_pm_set_max_dev_wakeup_lat()
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*
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* Returns -EINVAL for an invalid argument, -ERANGE if the constraint
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* is not satisfiable, or 0 upon success.
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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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* omap_pm_set_min_bus_tput - set minimum bus throughput needed by device
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* @dev: struct device * requesting the constraint
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* @tbus_id: interconnect to operate on (OCP_{INITIATOR,TARGET}_AGENT)
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* @r: minimum throughput (in KiB/s)
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*
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* Request that the minimum data throughput on the OCP interconnect
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* attached to device @dev interconnect agent @tbus_id be no less
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* than @r KiB/s.
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*
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* It is expected that the OMAP PM or bus code will use this
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* information to set the interconnect clock to run at the lowest
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* possible speed that satisfies all current system users. The PM or
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* bus code will adjust the estimate based on its model of the bus, so
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* device driver authors should attempt to specify an accurate
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* quantity for their device use case, and let the PM or bus code
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* overestimate the numbers as necessary to handle request/response
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* latency, other competing users on the system, etc. On OMAP2/3, if
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* a driver requests a minimum L4 interconnect speed constraint, the
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* code will also need to add an minimum L3 interconnect speed
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* constraint,
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*
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* Multiple calls to omap_pm_set_min_bus_tput() will replace the
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* previous rate value for this device. To remove the interconnect
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* throughput restriction for this device, call with r = 0.
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*
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* Returns -EINVAL for an invalid argument, -ERANGE if the constraint
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* is not satisfiable, or 0 upon success.
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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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* CPUFreq-originated constraint
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*
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* In the future, this should be handled by custom OPP clocktype
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* functions.
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*/
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/*
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* Device context loss tracking
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*/
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/**
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* omap_pm_get_dev_context_loss_count - return count of times dev has lost ctx
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* @dev: struct device *
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*
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* This function returns the number of times that the device @dev has
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* lost its internal context. This generally occurs on a powerdomain
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* transition to OFF. Drivers use this as an optimization to avoid restoring
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* context if the device hasn't lost it. To use, drivers should initially
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* call this in their context save functions and store the result. Early in
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* the driver's context restore function, the driver should call this function
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* again, and compare the result to the stored counter. If they differ, the
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* driver must restore device context. If the number of context losses
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* exceeds the maximum positive integer, the function will wrap to 0 and
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* continue counting. Returns the number of context losses for this device,
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* or negative value upon error.
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*/
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int omap_pm_get_dev_context_loss_count(struct device *dev);
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void omap_pm_enable_off_mode(void);
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void omap_pm_disable_off_mode(void);
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#endif
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