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ARM: OMAP2+: omap-pm-noop.c: Remove some unused functions

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Removes some functions that are not used anywhere:
omap_pm_set_max_dev_wakeup_lat() omap_pm_if_exit() omap_pm_cpu_get_freq()
omap_pm_cpu_set_freq() omap_pm_cpu_get_freq_table() omap_pm_dsp_get_opp()
omap_pm_dsp_set_min_opp() omap_pm_dsp_get_opp_table()
omap_pm_set_min_clk_rate() omap_pm_set_max_sdma_lat()

This was partially found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Rickard Strandqvist 2014-12-07 21:49:06 +01:00 committed by Tony Lindgren
parent b91dc63b2d
commit cd0007e283
2 changed files with 0 additions and 388 deletions
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196
arch/arm/mach-omap2/omap-pm-noop.c
View file

@ -86,200 +86,10 @@ int omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r)
return 0;
}
int omap_pm_set_max_dev_wakeup_lat(struct device *req_dev, struct device *dev,
long t)
{
if (!req_dev || !dev || t < -1) {
WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
return -EINVAL;
}
if (t == -1)
pr_debug("OMAP PM: remove max device latency constraint: dev %s\n",
dev_name(dev));
else
pr_debug("OMAP PM: add max device latency constraint: dev %s, t = %ld usec\n",
dev_name(dev), t);
/*
* For current Linux, this needs to map the device to a
* powerdomain, then go through the list of current max lat
* constraints on that powerdomain and find the smallest. If
* the latency constraint has changed, the code should
* recompute the state to enter for the next powerdomain
* state. Conceivably, this code should also determine
* whether to actually disable the device clocks or not,
* depending on how long it takes to re-enable the clocks.
*
* TI CDP code can call constraint_set here.
*/
return 0;
}
int omap_pm_set_max_sdma_lat(struct device *dev, long t)
{
if (!dev || t < -1) {
WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
return -EINVAL;
}
if (t == -1)
pr_debug("OMAP PM: remove max DMA latency constraint: dev %s\n",
dev_name(dev));
else
pr_debug("OMAP PM: add max DMA latency constraint: dev %s, t = %ld usec\n",
dev_name(dev), t);
/*
* For current Linux PM QOS params, this code should scan the
* list of maximum CPU and DMA latencies and select the
* smallest, then set cpu_dma_latency pm_qos_param
* accordingly.
*
* For future Linux PM QOS params, with separate CPU and DMA
* latency params, this code should just set the dma_latency param.
*
* TI CDP code can call constraint_set here.
*/
return 0;
}
int omap_pm_set_min_clk_rate(struct device *dev, struct clk *c, long r)
{
if (!dev || !c || r < 0) {
WARN(1, "OMAP PM: %s: invalid parameter(s)", __func__);
return -EINVAL;
}
if (r == 0)
pr_debug("OMAP PM: remove min clk rate constraint: dev %s\n",
dev_name(dev));
else
pr_debug("OMAP PM: add min clk rate constraint: dev %s, rate = %ld Hz\n",
dev_name(dev), r);
/*
* Code in a real implementation should keep track of these
* constraints on the clock, and determine the highest minimum
* clock rate. It should iterate over each OPP and determine
* whether the OPP will result in a clock rate that would
* satisfy this constraint (and any other PM constraint in effect
* at that time). Once it finds the lowest-voltage OPP that
* meets those conditions, it should switch to it, or return
* an error if the code is not capable of doing so.
*/
return 0;
}
/*
* DSP Bridge-specific constraints
*/
const struct omap_opp *omap_pm_dsp_get_opp_table(void)
{
pr_debug("OMAP PM: DSP request for OPP table\n");
/*
* Return DSP frequency table here: The final item in the
* array should have .rate = .opp_id = 0.
*/
return NULL;
}
void omap_pm_dsp_set_min_opp(u8 opp_id)
{
if (opp_id == 0) {
WARN_ON(1);
return;
}
pr_debug("OMAP PM: DSP requests minimum VDD1 OPP to be %d\n", opp_id);
/*
*
* For l-o dev tree, our VDD1 clk is keyed on OPP ID, so we
* can just test to see which is higher, the CPU's desired OPP
* ID or the DSP's desired OPP ID, and use whichever is
* highest.
*
* In CDP12.14+, the VDD1 OPP custom clock that controls the DSP
* rate is keyed on MPU speed, not the OPP ID. So we need to
* map the OPP ID to the MPU speed for use with clk_set_rate()
* if it is higher than the current OPP clock rate.
*
*/
}
u8 omap_pm_dsp_get_opp(void)
{
pr_debug("OMAP PM: DSP requests current DSP OPP ID\n");
/*
* For l-o dev tree, call clk_get_rate() on VDD1 OPP clock
*
* CDP12.14+:
* Call clk_get_rate() on the OPP custom clock, map that to an
* OPP ID using the tables defined in board-*.c/chip-*.c files.
*/
return 0;
}
/*
* CPUFreq-originated constraint
*
* In the future, this should be handled by custom OPP clocktype
* functions.
*/
struct cpufreq_frequency_table **omap_pm_cpu_get_freq_table(void)
{
pr_debug("OMAP PM: CPUFreq request for frequency table\n");
/*
* Return CPUFreq frequency table here: loop over
* all VDD1 clkrates, pull out the mpu_ck frequencies, build
* table
*/
return NULL;
}
void omap_pm_cpu_set_freq(unsigned long f)
{
if (f == 0) {
WARN_ON(1);
return;
}
pr_debug("OMAP PM: CPUFreq requests CPU frequency to be set to %lu\n",
f);
/*
* For l-o dev tree, determine whether MPU freq or DSP OPP id
* freq is higher. Find the OPP ID corresponding to the
* higher frequency. Call clk_round_rate() and clk_set_rate()
* on the OPP custom clock.
*
* CDP should just be able to set the VDD1 OPP clock rate here.
*/
}
unsigned long omap_pm_cpu_get_freq(void)
{
pr_debug("OMAP PM: CPUFreq requests current CPU frequency\n");
/*
* Call clk_get_rate() on the mpu_ck.
*/
return 0;
}
/**
* omap_pm_enable_off_mode - notify OMAP PM that off-mode is enabled
@ -363,9 +173,3 @@ int __init omap_pm_if_init(void)
{
return 0;
}
void omap_pm_if_exit(void)
{
/* Deallocate CPUFreq frequency table here */
}

192
arch/arm/mach-omap2/omap-pm.h
View file

@ -50,14 +50,6 @@ int __init omap_pm_if_early_init(void);
*/
int __init omap_pm_if_init(void);
/**
* omap_pm_if_exit - OMAP PM exit code
*
* Exit code; currently unused. The "_if_" is to avoid name
* collisions with the PM idle-loop code.
*/
void omap_pm_if_exit(void);
/*
* Device-driver-originated constraints (via board-*.c files, platform_data)
*/
@ -132,163 +124,6 @@ int omap_pm_set_max_mpu_wakeup_lat(struct device *dev, long t);
int omap_pm_set_min_bus_tput(struct device *dev, u8 agent_id, unsigned long r);
/**
* omap_pm_set_max_dev_wakeup_lat - set the maximum device enable latency
* @req_dev: struct device * requesting the constraint, or NULL if none
* @dev: struct device * to set the constraint one
* @t: maximum device wakeup latency in microseconds
*
* Request that the maximum amount of time necessary for a device @dev
* to become accessible after its clocks are enabled should be no
* greater than @t microseconds. Specifically, this represents the
* time from when a device driver enables device clocks with
* clk_enable(), to when the register reads and writes on the device
* will succeed. This function should be called before clk_disable()
* is called, since the power state transition decision may be made
* during clk_disable().
*
* It is intended that underlying PM code will use this information to
* determine what power state to put the powerdomain enclosing this
* device into.
*
* Multiple calls to omap_pm_set_max_dev_wakeup_lat() will replace the
* previous wakeup latency values for this device. To remove the
* wakeup latency restriction for this device, call with t = -1.
*
* Returns -EINVAL for an invalid argument, -ERANGE if the constraint
* is not satisfiable, or 0 upon success.
*/
int omap_pm_set_max_dev_wakeup_lat(struct device *req_dev, struct device *dev,
long t);
/**
* omap_pm_set_max_sdma_lat - set the maximum system DMA transfer start latency
* @dev: struct device *
* @t: maximum DMA transfer start latency in microseconds
*
* Request that the maximum system DMA transfer start latency for this
* device 'dev' should be no greater than 't' microseconds. "DMA
* transfer start latency" here is defined as the elapsed time from
* when a device (e.g., McBSP) requests that a system DMA transfer
* start or continue, to the time at which data starts to flow into
* that device from the system DMA controller.
*
* It is intended that underlying PM code will use this information to
* determine what power state to put the CORE powerdomain into.
*
* Since system DMA transfers may not involve the MPU, this function
* will not affect MPU wakeup latency. Use set_max_cpu_lat() to do
* so. Similarly, this function will not affect device wakeup latency
* -- use set_max_dev_wakeup_lat() to affect that.
*
* Multiple calls to set_max_sdma_lat() will replace the previous t
* value for this device. To remove the maximum DMA latency for this
* device, call with t = -1.
*
* Returns -EINVAL for an invalid argument, -ERANGE if the constraint
* is not satisfiable, or 0 upon success.
*/
int omap_pm_set_max_sdma_lat(struct device *dev, long t);
/**
* omap_pm_set_min_clk_rate - set minimum clock rate requested by @dev
* @dev: struct device * requesting the constraint
* @clk: struct clk * to set the minimum rate constraint on
* @r: minimum rate in Hz
*
* Request that the minimum clock rate on the device @dev's clk @clk
* be no less than @r Hz.
*
* It is expected that the OMAP PM code will use this information to
* find an OPP or clock setting that will satisfy this clock rate
* constraint, along with any other applicable system constraints on
* the clock rate or corresponding voltage, etc.
*
* omap_pm_set_min_clk_rate() differs from the clock code's
* clk_set_rate() in that it considers other constraints before taking
* any hardware action, and may change a system OPP rather than just a
* clock rate. clk_set_rate() is intended to be a low-level
* interface.
*
* omap_pm_set_min_clk_rate() is easily open to abuse. A better API
* would be something like "omap_pm_set_min_dev_performance()";
* however, there is no easily-generalizable concept of performance
* that applies to all devices. Only a device (and possibly the
* device subsystem) has both the subsystem-specific knowledge, and
* the hardware IP block-specific knowledge, to translate a constraint
* on "touchscreen sampling accuracy" or "number of pixels or polygons
* rendered per second" to a clock rate. This translation can be
* dependent on the hardware IP block's revision, or firmware version,
* and the driver is the only code on the system that has this
* information and can know how to translate that into a clock rate.
*
* The intended use-case for this function is for userspace or other
* kernel code to communicate a particular performance requirement to
* a subsystem; then for the subsystem to communicate that requirement
* to something that is meaningful to the device driver; then for the
* device driver to convert that requirement to a clock rate, and to
* then call omap_pm_set_min_clk_rate().
*
* Users of this function (such as device drivers) should not simply
* call this function with some high clock rate to ensure "high
* performance." Rather, the device driver should take a performance
* constraint from its subsystem, such as "render at least X polygons
* per second," and use some formula or table to convert that into a
* clock rate constraint given the hardware type and hardware
* revision. Device drivers or subsystems should not assume that they
* know how to make a power/performance tradeoff - some device use
* cases may tolerate a lower-fidelity device function for lower power
* consumption; others may demand a higher-fidelity device function,
* no matter what the power consumption.
*
* Multiple calls to omap_pm_set_min_clk_rate() will replace the
* previous rate value for the device @dev. To remove the minimum clock
* rate constraint for the device, call with r = 0.
*
* Returns -EINVAL for an invalid argument, -ERANGE if the constraint
* is not satisfiable, or 0 upon success.
*/
int omap_pm_set_min_clk_rate(struct device *dev, struct clk *c, long r);
/*
* DSP Bridge-specific constraints
*/
/**
* omap_pm_dsp_get_opp_table - get OPP->DSP clock frequency table
*
* Intended for use by DSPBridge. Returns an array of OPP->DSP clock
* frequency entries. The final item in the array should have .rate =
* .opp_id = 0.
*/
const struct omap_opp *omap_pm_dsp_get_opp_table(void);
/**
* omap_pm_dsp_set_min_opp - receive desired OPP target ID from DSP Bridge
* @opp_id: target DSP OPP ID
*
* Set a minimum OPP ID for the DSP. This is intended to be called
* only from the DSP Bridge MPU-side driver. Unfortunately, the only
* information that code receives from the DSP/BIOS load estimator is the
* target OPP ID; hence, this interface. No return value.
*/
void omap_pm_dsp_set_min_opp(u8 opp_id);
/**
* omap_pm_dsp_get_opp - report the current DSP OPP ID
*
* Report the current OPP for the DSP. Since on OMAP3, the DSP and
* MPU share a single voltage domain, the OPP ID returned back may
* represent a higher DSP speed than the OPP requested via
* omap_pm_dsp_set_min_opp().
*
* Returns the current VDD1 OPP ID, or 0 upon error.
*/
u8 omap_pm_dsp_get_opp(void);
/*
* CPUFreq-originated constraint
*
@ -296,33 +131,6 @@ u8 omap_pm_dsp_get_opp(void);
* functions.
*/
/**
* omap_pm_cpu_get_freq_table - return a cpufreq_frequency_table array ptr
*
* Provide a frequency table usable by CPUFreq for the current chip/board.
* Returns a pointer to a struct cpufreq_frequency_table array or NULL
* upon error.
*/
struct cpufreq_frequency_table **omap_pm_cpu_get_freq_table(void);
/**
* omap_pm_cpu_set_freq - set the current minimum MPU frequency
* @f: MPU frequency in Hz
*
* Set the current minimum CPU frequency. The actual CPU frequency
* used could end up higher if the DSP requested a higher OPP.
* Intended to be called by plat-omap/cpu_omap.c:omap_target(). No
* return value.
*/
void omap_pm_cpu_set_freq(unsigned long f);
/**
* omap_pm_cpu_get_freq - report the current CPU frequency
*
* Returns the current MPU frequency, or 0 upon error.
*/
unsigned long omap_pm_cpu_get_freq(void);
/*
* Device context loss tracking