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Commit 2af78448 authored by Linus Torvalds's avatar Linus Torvalds
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Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 

Pull thermal management updates from Zhang Rui:
 "Highlights:

   - introduction of Dove thermal sensor driver.

   - introduction of Kirkwood thermal sensor driver.

   - introduction of intel_powerclamp thermal cooling device driver.

   - add interrupt and DT support for rcar thermal driver.

   - add thermal emulation support which allows platform thermal driver
     to do software/hardware emulation for thermal issues."

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: (36 commits)
  thermal: rcar: remove __devinitconst
  thermal: return an error on failure to register thermal class
  Thermal: rename thermal governor Kconfig option to avoid generic naming
  thermal: exynos: Use the new thermal trend type for quick cooling action.
  Thermal: exynos: Add support for temperature falling interrupt.
  Thermal: Dove: Add Themal sensor support for Dove.
  thermal: Add support for the thermal sensor on Kirkwood SoCs
  thermal: rcar: add Device Tree support
  thermal: rcar: remove machine_power_off() from rcar_thermal_notify()
  thermal: rcar: add interrupt support
  thermal: rcar: add read/write functions for common/priv data
  thermal: rcar: multi channel support
  thermal: rcar: use mutex lock instead of spin lock
  thermal: rcar: enable CPCTL to use hardware TSC deciding
  thermal: rcar: use parenthesis on macro
  Thermal: fix a build warning when CONFIG_THERMAL_EMULATION cleared
  Thermal: fix a wrong comment
  thermal: sysfs: Add a new sysfs node emul_temp for thermal emulation
  PM: intel_powerclamp: off by one in start_power_clamp()
  thermal: exynos: Miscellaneous fixes to support falling threshold interrupt
  ...
parents 5e04f4b4 f5b6d45f
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Documentation/devicetree/bindings/thermal/dove-thermal.txt 0 → 100644
View file @ 2af78448
* Dove Thermal
This driver is for Dove SoCs which contain a thermal sensor.
Required properties:
- compatible : "marvell,dove-thermal"
- reg : Address range of the thermal registers
The reg properties should contain two ranges. The first is for the
three Thermal Manager registers, while the second range contains the
Thermal Diode Control Registers.
Example:
thermal@10078 {
compatible = "marvell,dove-thermal";
reg = <0xd001c 0x0c>, <0xd005c 0x08>;
};
Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt 0 → 100644
View file @ 2af78448
* Kirkwood Thermal
This version is for Kirkwood 88F8262 & 88F6283 SoCs. Other kirkwoods
don't contain a thermal sensor.
Required properties:
- compatible : "marvell,kirkwood-thermal"
- reg : Address range of the thermal registers
Example:
thermal@10078 {
compatible = "marvell,kirkwood-thermal";
reg = <0x10078 0x4>;
};
Documentation/devicetree/bindings/thermal/rcar-thermal.txt 0 → 100644
View file @ 2af78448
* Renesas R-Car Thermal
Required properties:
- compatible : "renesas,rcar-thermal"
- reg : Address range of the thermal registers.
The 1st reg will be recognized as common register
if it has "interrupts".
Option properties:
- interrupts : use interrupt
Example (non interrupt support):
thermal@e61f0100 {
compatible = "renesas,rcar-thermal";
reg = <0xe61f0100 0x38>;
};
Example (interrupt support):
thermal@e61f0000 {
compatible = "renesas,rcar-thermal";
reg = <0xe61f0000 0x14
0xe61f0100 0x38
0xe61f0200 0x38
0xe61f0300 0x38>;
interrupts = <0 69 4>;
};
Documentation/thermal/exynos_thermal_emulation 0 → 100644
View file @ 2af78448
EXYNOS EMULATION MODE
========================
Copyright (C) 2012 Samsung Electronics
Written by Jonghwa Lee <jonghwa3.lee@samsung.com>
Description
-----------
Exynos 4x12 (4212, 4412) and 5 series provide emulation mode for thermal management unit.
Thermal emulation mode supports software debug for TMU's operation. User can set temperature
manually with software code and TMU will read current temperature from user value not from
sensor's value.
Enabling CONFIG_EXYNOS_THERMAL_EMUL option will make this support in available.
When it's enabled, sysfs node will be created under
/sys/bus/platform/devices/'exynos device name'/ with name of 'emulation'.
The sysfs node, 'emulation', will contain value 0 for the initial state. When you input any
temperature you want to update to sysfs node, it automatically enable emulation mode and
current temperature will be changed into it.
(Exynos also supports user changable delay time which would be used to delay of
changing temperature. However, this node only uses same delay of real sensing time, 938us.)
Exynos emulation mode requires synchronous of value changing and enabling. It means when you
want to update the any value of delay or next temperature, then you have to enable emulation
mode at the same time. (Or you have to keep the mode enabling.) If you don't, it fails to
change the value to updated one and just use last succeessful value repeatedly. That's why
this node gives users the right to change termerpature only. Just one interface makes it more
simply to use.
Disabling emulation mode only requires writing value 0 to sysfs node.
TEMP 120 |
|
100 |
|
80 |
| +-----------
60 | | |
| +-------------| |
40 | | | |
| | | |
20 | | | +----------
| | | | |
0 |______________|_____________|__________|__________|_________
A A A A TIME
|<----->| |<----->| |<----->| |
| 938us | | | | | |
emulation : 0 50 | 70 | 20 | 0
current temp : sensor 50 70 20 sensor
Documentation/thermal/intel_powerclamp.txt 0 → 100644
View file @ 2af78448
=======================
INTEL POWERCLAMP DRIVER
=======================
By: Arjan van de Ven <arjan@linux.intel.com>
Jacob Pan <jacob.jun.pan@linux.intel.com>
Contents:
(*) Introduction
- Goals and Objectives
(*) Theory of Operation
- Idle Injection
- Calibration
(*) Performance Analysis
- Effectiveness and Limitations
- Power vs Performance
- Scalability
- Calibration
- Comparison with Alternative Techniques
(*) Usage and Interfaces
- Generic Thermal Layer (sysfs)
- Kernel APIs (TBD)
============
INTRODUCTION
============
Consider the situation where a system’s power consumption must be
reduced at runtime, due to power budget, thermal constraint, or noise
level, and where active cooling is not preferred. Software managed
passive power reduction must be performed to prevent the hardware
actions that are designed for catastrophic scenarios.
Currently, P-states, T-states (clock modulation), and CPU offlining
are used for CPU throttling.
On Intel CPUs, C-states provide effective power reduction, but so far
they’re only used opportunistically, based on workload. With the
development of intel_powerclamp driver, the method of synchronizing
idle injection across all online CPU threads was introduced. The goal
is to achieve forced and controllable C-state residency.
Test/Analysis has been made in the areas of power, performance,
scalability, and user experience. In many cases, clear advantage is
shown over taking the CPU offline or modulating the CPU clock.
===================
THEORY OF OPERATION
===================
Idle Injection
--------------
On modern Intel processors (Nehalem or later), package level C-state
residency is available in MSRs, thus also available to the kernel.
These MSRs are:
#define MSR_PKG_C2_RESIDENCY 0x60D
#define MSR_PKG_C3_RESIDENCY 0x3F8
#define MSR_PKG_C6_RESIDENCY 0x3F9
#define MSR_PKG_C7_RESIDENCY 0x3FA
If the kernel can also inject idle time to the system, then a
closed-loop control system can be established that manages package
level C-state. The intel_powerclamp driver is conceived as such a
control system, where the target set point is a user-selected idle
ratio (based on power reduction), and the error is the difference
between the actual package level C-state residency ratio and the target idle
ratio.
Injection is controlled by high priority kernel threads, spawned for
each online CPU.
These kernel threads, with SCHED_FIFO class, are created to perform
clamping actions of controlled duty ratio and duration. Each per-CPU
thread synchronizes its idle time and duration, based on the rounding
of jiffies, so accumulated errors can be prevented to avoid a jittery
effect. Threads are also bound to the CPU such that they cannot be
migrated, unless the CPU is taken offline. In this case, threads
belong to the offlined CPUs will be terminated immediately.
Running as SCHED_FIFO and relatively high priority, also allows such
scheme to work for both preemptable and non-preemptable kernels.
Alignment of idle time around jiffies ensures scalability for HZ
values. This effect can be better visualized using a Perf timechart.
The following diagram shows the behavior of kernel thread
kidle_inject/cpu. During idle injection, it runs monitor/mwait idle
for a given "duration", then relinquishes the CPU to other tasks,
until the next time interval.
The NOHZ schedule tick is disabled during idle time, but interrupts
are not masked. Tests show that the extra wakeups from scheduler tick
have a dramatic impact on the effectiveness of the powerclamp driver
on large scale systems (Westmere system with 80 processors).
CPU0
____________ ____________
kidle_inject/0 | sleep | mwait | sleep |
_________| |________| |_______
duration
CPU1
____________ ____________
kidle_inject/1 | sleep | mwait | sleep |
_________| |________| |_______
^
|
|
roundup(jiffies, interval)
Only one CPU is allowed to collect statistics and update global
control parameters. This CPU is referred to as the controlling CPU in
this document. The controlling CPU is elected at runtime, with a
policy that favors BSP, taking into account the possibility of a CPU
hot-plug.
In terms of dynamics of the idle control system, package level idle
time is considered largely as a non-causal system where its behavior
cannot be based on the past or current input. Therefore, the
intel_powerclamp driver attempts to enforce the desired idle time
instantly as given input (target idle ratio). After injection,
powerclamp moniors the actual idle for a given time window and adjust
the next injection accordingly to avoid over/under correction.
When used in a causal control system, such as a temperature control,
it is up to the user of this driver to implement algorithms where
past samples and outputs are included in the feedback. For example, a
PID-based thermal controller can use the powerclamp driver to
maintain a desired target temperature, based on integral and
derivative gains of the past samples.
Calibration
-----------
During scalability testing, it is observed that synchronized actions
among CPUs become challenging as the number of cores grows. This is
also true for the ability of a system to enter package level C-states.
To make sure the intel_powerclamp driver scales well, online
calibration is implemented. The goals for doing such a calibration
are:
a) determine the effective range of idle injection ratio
b) determine the amount of compensation needed at each target ratio
Compensation to each target ratio consists of two parts:
a) steady state error compensation
This is to offset the error occurring when the system can
enter idle without extra wakeups (such as external interrupts).
b) dynamic error compensation
When an excessive amount of wakeups occurs during idle, an
additional idle ratio can be added to quiet interrupts, by
slowing down CPU activities.
A debugfs file is provided for the user to examine compensation
progress and results, such as on a Westmere system.
[jacob@nex01 ~]$ cat
/sys/kernel/debug/intel_powerclamp/powerclamp_calib
controlling cpu: 0
pct confidence steady dynamic (compensation)
0 0 0 0
1 1 0 0
2 1 1 0
3 3 1 0
4 3 1 0
5 3 1 0
6 3 1 0
7 3 1 0
8 3 1 0
...
30 3 2 0
31 3 2 0
32 3 1 0
33 3 2 0
34 3 1 0
35 3 2 0
36 3 1 0
37 3 2 0
38 3 1 0
39 3 2 0
40 3 3 0
41 3 1 0
42 3 2 0
43 3 1 0
44 3 1 0
45 3 2 0
46 3 3 0
47 3 0 0
48 3 2 0
49 3 3 0
Calibration occurs during runtime. No offline method is available.
Steady state compensation is used only when confidence levels of all
adjacent ratios have reached satisfactory level. A confidence level
is accumulated based on clean data collected at runtime. Data
collected during a period without extra interrupts is considered
clean.
To compensate for excessive amounts of wakeup during idle, additional
idle time is injected when such a condition is detected. Currently,
we have a simple algorithm to double the injection ratio. A possible
enhancement might be to throttle the offending IRQ, such as delaying
EOI for level triggered interrupts. But it is a challenge to be
non-intrusive to the scheduler or the IRQ core code.
CPU Online/Offline
------------------
Per-CPU kernel threads are started/stopped upon receiving
notifications of CPU hotplug activities. The intel_powerclamp driver
keeps track of clamping kernel threads, even after they are migrated
to other CPUs, after a CPU offline event.
=====================
Performance Analysis
=====================
This section describes the general performance data collected on
multiple systems, including Westmere (80P) and Ivy Bridge (4P, 8P).
Effectiveness and Limitations
-----------------------------
The maximum range that idle injection is allowed is capped at 50
percent. As mentioned earlier, since interrupts are allowed during
forced idle time, excessive interrupts could result in less
effectiveness. The extreme case would be doing a ping -f to generated
flooded network interrupts without much CPU acknowledgement. In this
case, little can be done from the idle injection threads. In most
normal cases, such as scp a large file, applications can be throttled
by the powerclamp driver, since slowing down the CPU also slows down
network protocol processing, which in turn reduces interrupts.
When control parameters change at runtime by the controlling CPU, it
may take an additional period for the rest of the CPUs to catch up
with the changes. During this time, idle injection is out of sync,
thus not able to enter package C- states at the expected ratio. But
this effect is minor, in that in most cases change to the target
ratio is updated much less frequently than the idle injection
frequency.
Scalability
-----------
Tests also show a minor, but measurable, difference between the 4P/8P
Ivy Bridge system and the 80P Westmere server under 50% idle ratio.
More compensation is needed on Westmere for the same amount of
target idle ratio. The compensation also increases as the idle ratio
gets larger. The above reason constitutes the need for the
calibration code.
On the IVB 8P system, compared to an offline CPU, powerclamp can
achieve up to 40% better performance per watt. (measured by a spin
counter summed over per CPU counting threads spawned for all running
CPUs).
====================
Usage and Interfaces
====================
The powerclamp driver is registered to the generic thermal layer as a
cooling device. Currently, it’s not bound to any thermal zones.
jacob@chromoly:/sys/class/thermal/cooling_device14$ grep . *
cur_state:0
max_state:50
type:intel_powerclamp
Example usage:
- To inject 25% idle time
$ sudo sh -c "echo 25 > /sys/class/thermal/cooling_device80/cur_state
"
If the system is not busy and has more than 25% idle time already,
then the powerclamp driver will not start idle injection. Using Top
will not show idle injection kernel threads.
If the system is busy (spin test below) and has less than 25% natural
idle time, powerclamp kernel threads will do idle injection, which
appear running to the scheduler. But the overall system idle is still
reflected. In this example, 24.1% idle is shown. This helps the
system admin or user determine the cause of slowdown, when a
powerclamp driver is in action.
Tasks: 197 total, 1 running, 196 sleeping, 0 stopped, 0 zombie
Cpu(s): 71.2%us, 4.7%sy, 0.0%ni, 24.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3943228k total, 1689632k used, 2253596k free, 74960k buffers
Swap: 4087804k total, 0k used, 4087804k free, 945336k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3352 jacob 20 0 262m 644 428 S 286 0.0 0:17.16 spin
3341 root -51 0 0 0 0 D 25 0.0 0:01.62 kidle_inject/0
3344 root -51 0 0 0 0 D 25 0.0 0:01.60 kidle_inject/3
3342 root -51 0 0 0 0 D 25 0.0 0:01.61 kidle_inject/1
3343 root -51 0 0 0 0 D 25 0.0 0:01.60 kidle_inject/2
2935 jacob 20 0 696m 125m 35m S 5 3.3 0:31.11 firefox
1546 root 20 0 158m 20m 6640 S 3 0.5 0:26.97 Xorg
2100 jacob 20 0 1223m 88m 30m S 3 2.3 0:23.68 compiz
Tests have shown that by using the powerclamp driver as a cooling
device, a PID based userspace thermal controller can manage to
control CPU temperature effectively, when no other thermal influence
is added. For example, a UltraBook user can compile the kernel under
certain temperature (below most active trip points).
Documentation/thermal/sysfs-api.txt
View file @ 2af78448
......@@ -55,6 +55,8 @@ temperature) and throttle appropriate devices.
.get_trip_type: get the type of certain trip point.
.get_trip_temp: get the temperature above which the certain trip point
will be fired.
.set_emul_temp: set the emulation temperature which helps in debugging
different threshold temperature points.
1.1.2 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
......@@ -153,6 +155,7 @@ Thermal zone device sys I/F, created once it's registered:
|---trip_point_[0-*]_temp: Trip point temperature
|---trip_point_[0-*]_type: Trip point type
|---trip_point_[0-*]_hyst: Hysteresis value for this trip point
|---emul_temp: Emulated temperature set node
Thermal cooling device sys I/F, created once it's registered:
/sys/class/thermal/cooling_device[0-*]:
......@@ -252,6 +255,16 @@ passive
Valid values: 0 (disabled) or greater than 1000
RW, Optional
emul_temp
Interface to set the emulated temperature method in thermal zone
(sensor). After setting this temperature, the thermal zone may pass
this temperature to platform emulation function if registered or
cache it locally. This is useful in debugging different temperature
threshold and its associated cooling action. This is write only node
and writing 0 on this node should disable emulation.
Unit: millidegree Celsius
WO, Optional
*****************************
* Cooling device attributes *
*****************************
......@@ -329,8 +342,9 @@ The framework includes a simple notification mechanism, in the form of a
netlink event. Netlink socket initialization is done during the _init_
of the framework. Drivers which intend to use the notification mechanism
just need to call thermal_generate_netlink_event() with two arguments viz
(originator, event). Typically the originator will be an integer assigned
to a thermal_zone_device when it registers itself with the framework. The
(originator, event). The originator is a pointer to struct thermal_zone_device
from where the event has been originated. An integer which represents the
thermal zone device will be used in the message to identify the zone. The
event will be one of:{THERMAL_AUX0, THERMAL_AUX1, THERMAL_CRITICAL,
THERMAL_DEV_FAULT}. Notification can be sent when the current temperature
crosses any of the configured thresholds.
......
arch/x86/kernel/nmi.c
View file @ 2af78448
......@@ -509,3 +509,4 @@ void local_touch_nmi(void)
{
__this_cpu_write(last_nmi_rip, 0);
}
EXPORT_SYMBOL_GPL(local_touch_nmi);
drivers/thermal/Kconfig
View file @ 2af78448
......@@ -29,14 +29,14 @@ choice
config THERMAL_DEFAULT_GOV_STEP_WISE
bool "step_wise"
select STEP_WISE
select THERMAL_GOV_STEP_WISE
help
Use the step_wise governor as default. This throttles the
devices one step at a time.
config THERMAL_DEFAULT_GOV_FAIR_SHARE
bool "fair_share"
select FAIR_SHARE
select THERMAL_GOV_FAIR_SHARE
help
Use the fair_share governor as default. This throttles the
devices based on their 'contribution' to a zone. The
......@@ -44,24 +44,24 @@ config THERMAL_DEFAULT_GOV_FAIR_SHARE
config THERMAL_DEFAULT_GOV_USER_SPACE
bool "user_space"
select USER_SPACE
select THERMAL_GOV_USER_SPACE
help
Select this if you want to let the user space manage the
lpatform thermals.
endchoice
config FAIR_SHARE
config THERMAL_GOV_FAIR_SHARE
bool "Fair-share thermal governor"
help
Enable this to manage platform thermals using fair-share governor.
config STEP_WISE
config THERMAL_GOV_STEP_WISE
bool "Step_wise thermal governor"
help
Enable this to manage platform thermals using a simple linear
config USER_SPACE
config THERMAL_GOV_USER_SPACE
bool "User_space thermal governor"
help
Enable this to let the user space manage the platform thermals.
......@@ -78,6 +78,14 @@ config CPU_THERMAL
and not the ACPI interface.
If you want this support, you should say Y here.
config THERMAL_EMULATION
bool "Thermal emulation mode support"
help
Enable this option to make a emul_temp sysfs node in thermal zone
directory to support temperature emulation. With emulation sysfs node,
user can manually input temperature and test the different trip
threshold behaviour for simulation purpose.
config SPEAR_THERMAL
bool "SPEAr thermal sensor driver"
depends on PLAT_SPEAR
......@@ -93,6 +101,14 @@ config RCAR_THERMAL
Enable this to plug the R-Car thermal sensor driver into the Linux
thermal framework
config KIRKWOOD_THERMAL
tristate "Temperature sensor on Marvell Kirkwood SoCs"
depends on ARCH_KIRKWOOD
depends on OF
help
Support for the Kirkwood thermal sensor driver into the Linux thermal
framework. Only kirkwood 88F6282 and 88F6283 have this sensor.
config EXYNOS_THERMAL
tristate "Temperature sensor on Samsung EXYNOS"
depends on (ARCH_EXYNOS4 || ARCH_EXYNOS5)
......@@ -101,6 +117,23 @@ config EXYNOS_THERMAL
If you say yes here you get support for TMU (Thermal Management
Unit) on SAMSUNG EXYNOS series of SoC.
config EXYNOS_THERMAL_EMUL
bool "EXYNOS TMU emulation mode support"
depends on EXYNOS_THERMAL
help
Exynos 4412 and 4414 and 5 series has emulation mode on TMU.
Enable this option will be make sysfs node in exynos thermal platform
device directory to support emulation mode. With emulation mode sysfs
node, you can manually input temperature to TMU for simulation purpose.
config DOVE_THERMAL
tristate "Temperature sensor on Marvell Dove SoCs"
depends on ARCH_DOVE
depends on OF
help
Support for the Dove thermal sensor driver in the Linux thermal
framework.
config DB8500_THERMAL
bool "DB8500 thermal management"
depends on ARCH_U8500
......@@ -122,4 +155,14 @@ config DB8500_CPUFREQ_COOLING
bound cpufreq cooling device turns active to set CPU frequency low to
cool down the CPU.
config INTEL_POWERCLAMP
tristate "Intel PowerClamp idle injection driver"
depends on THERMAL
depends on X86
depends on CPU_SUP_INTEL
help
Enable this to enable Intel PowerClamp idle injection driver. This
enforce idle time which results in more package C-state residency. The
user interface is exposed via generic thermal framework.
endif
drivers/thermal/Makefile
View file @ 2af78448
......@@ -5,9 +5,9 @@
obj-$(CONFIG_THERMAL) += thermal_sys.o
# governors
obj-$(CONFIG_FAIR_SHARE) += fair_share.o
obj-$(CONFIG_STEP_WISE) += step_wise.o
obj-$(CONFIG_USER_SPACE) += user_space.o
obj-$(CONFIG_THERMAL_GOV_FAIR_SHARE) += fair_share.o
obj-$(CONFIG_THERMAL_GOV_STEP_WISE) += step_wise.o
obj-$(CONFIG_THERMAL_GOV_USER_SPACE) += user_space.o
# cpufreq cooling
obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
......@@ -15,6 +15,10 @@ obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o
# platform thermal drivers
obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
obj-$(CONFIG_KIRKWOOD_THERMAL) += kirkwood_thermal.o
obj-$(CONFIG_EXYNOS_THERMAL) += exynos_thermal.o
obj-$(CONFIG_DOVE_THERMAL) += dove_thermal.o
obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o
obj-$(CONFIG_DB8500_CPUFREQ_COOLING) += db8500_cpufreq_cooling.o
obj-$(CONFIG_INTEL_POWERCLAMP) += intel_powerclamp.o
drivers/thermal/cpu_cooling.c
View file @ 2af78448
......@@ -111,8 +111,8 @@ static int is_cpufreq_valid(int cpu)
/**
* get_cpu_frequency - get the absolute value of frequency from level.
* @cpu: cpu for which frequency is fetched.
* @level: level of frequency of the CPU
* e.g level=1 --> 1st MAX FREQ, LEVEL=2 ---> 2nd MAX FREQ, .... etc
* @level: level of frequency, equals cooling state of cpu cooling device
* e.g level=0 --> 1st MAX FREQ, level=1 ---> 2nd MAX FREQ, .... etc
*/
static unsigned int get_cpu_frequency(unsigned int cpu, unsigned long level)
{
......
drivers/thermal/db8500_cpufreq_cooling.c
View file @ 2af78448
......@@ -21,6 +21,7 @@
#include <linux/cpufreq.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
......@@ -73,15 +74,13 @@ static const struct of_device_id db8500_cpufreq_cooling_match[] = {
{ .compatible = "stericsson,db8500-cpufreq-cooling" },
{},
};
#else
#define db8500_cpufreq_cooling_match NULL
#endif
static struct platform_driver db8500_cpufreq_cooling_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "db8500-cpufreq-cooling",
.of_match_table = db8500_cpufreq_cooling_match,
.of_match_table = of_match_ptr(db8500_cpufreq_cooling_match),
},
.probe = db8500_cpufreq_cooling_probe,
.suspend = db8500_cpufreq_cooling_suspend,
......
drivers/thermal/db8500_thermal.c
View file @ 2af78448
......@@ -508,15 +508,13 @@ static const struct of_device_id db8500_thermal_match[] = {
{ .compatible = "stericsson,db8500-thermal" },
{},
};
#else
#define db8500_thermal_match NULL
#endif
static struct platform_driver db8500_thermal_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "db8500-thermal",
.of_match_table = db8500_thermal_match,
.of_match_table = of_match_ptr(db8500_thermal_match),
},
.probe = db8500_thermal_probe,
.suspend = db8500_thermal_suspend,
......
drivers/thermal/dove_thermal.c 0 → 100644
View file @ 2af78448
/*
* Dove thermal sensor driver
*
* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>
#define DOVE_THERMAL_TEMP_OFFSET 1
#define DOVE_THERMAL_TEMP_MASK 0x1FF
/* Dove Thermal Manager Control and Status Register */
#define PMU_TM_DISABLE_OFFS 0
#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
/* Dove Theraml Diode Control 0 Register */
#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
#define PMU_TDC0_SEL_VCAL_OFFS 5
#define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS)
#define PMU_TDC0_REF_CAL_CNT_OFFS 11
#define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
#define PMU_TDC0_AVG_NUM_OFFS 25
#define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS)
/* Dove Thermal Diode Control 1 Register */
#define PMU_TEMP_DIOD_CTRL1_REG 0x04
#define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10)
/* Dove Thermal Sensor Dev Structure */
struct dove_thermal_priv {
void __iomem *sensor;
void __iomem *control;
};
static int dove_init_sensor(const struct dove_thermal_priv *priv)
{
u32 reg;
u32 i;
/* Configure the Diode Control Register #0 */
reg = readl_relaxed(priv->control);
/* Use average of 2 */
reg &= ~PMU_TDC0_AVG_NUM_MASK;
reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS);
/* Reference calibration value */
reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);
/* Set the high level reference for calibration */
reg &= ~PMU_TDC0_SEL_VCAL_MASK;
reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
writel(reg, priv->control);
/* Reset the sensor */
reg = readl_relaxed(priv->control);
writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
writel(reg, priv->control);
/* Enable the sensor */
reg = readl_relaxed(priv->sensor);
reg &= ~PMU_TM_DISABLE_MASK;
writel(reg, priv->sensor);
/* Poll the sensor for the first reading */
for (i = 0; i < 1000000; i++) {
reg = readl_relaxed(priv->sensor);
if (reg & DOVE_THERMAL_TEMP_MASK)
break;
}
if (i == 1000000)
return -EIO;
return 0;
}
static int dove_get_temp(struct thermal_zone_device *thermal,
unsigned long *temp)
{
unsigned long reg;
struct dove_thermal_priv *priv = thermal->devdata;
/* Valid check */
reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) {
dev_err(&thermal->device,
"Temperature sensor reading not valid\n");
return -EIO;
}
/*
* Calculate temperature. See Section 8.10.1 of 88AP510,
* Documentation/arm/Marvell/README
*/
reg = readl_relaxed(priv->sensor);
reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
*temp = ((2281638UL - (7298*reg)) / 10);
return 0;
}
static struct thermal_zone_device_ops ops = {
.get_temp = dove_get_temp,
};
static const struct of_device_id dove_thermal_id_table[] = {
{ .compatible = "marvell,dove-thermal" },
{}
};
static int dove_thermal_probe(struct platform_device *pdev)
{
struct thermal_zone_device *thermal = NULL;
struct dove_thermal_priv *priv;
struct resource *res;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Failed to get platform resource\n");
return -ENODEV;
}
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->sensor = devm_request_and_ioremap(&pdev->dev, res);
if (!priv->sensor) {
dev_err(&pdev->dev, "Failed to request_ioremap memory\n");
return -EADDRNOTAVAIL;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(&pdev->dev, "Failed to get platform resource\n");
return -ENODEV;
}
priv->control = devm_request_and_ioremap(&pdev->dev, res);
if (!priv->control) {
dev_err(&pdev->dev, "Failed to request_ioremap memory\n");
return -EADDRNOTAVAIL;
}
ret = dove_init_sensor(priv);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize sensor\n");
return ret;
}
thermal = thermal_zone_device_register("dove_thermal", 0, 0,
priv, &ops, NULL, 0, 0);
if (IS_ERR(thermal)) {
dev_err(&pdev->dev,
"Failed to register thermal zone device\n");
return PTR_ERR(thermal);
}
platform_set_drvdata(pdev, thermal);
return 0;
}
static int dove_thermal_exit(struct platform_device *pdev)
{
struct thermal_zone_device *dove_thermal =
platform_get_drvdata(pdev);
thermal_zone_device_unregister(dove_thermal);
platform_set_drvdata(pdev, NULL);
return 0;
}
MODULE_DEVICE_TABLE(of, dove_thermal_id_table);
static struct platform_driver dove_thermal_driver = {
.probe = dove_thermal_probe,
.remove = dove_thermal_exit,
.driver = {
.name = "dove_thermal",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(dove_thermal_id_table),
},
};
module_platform_driver(dove_thermal_driver);
MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
MODULE_DESCRIPTION("Dove thermal driver");
MODULE_LICENSE("GPL");
drivers/thermal/exynos_thermal.c
View file @ 2af78448
......@@ -82,7 +82,7 @@
#define EXYNOS_TRIMINFO_RELOAD 0x1
#define EXYNOS_TMU_CLEAR_RISE_INT 0x111
#define EXYNOS_TMU_CLEAR_FALL_INT (0x111 << 16)
#define EXYNOS_TMU_CLEAR_FALL_INT (0x111 << 12)
#define EXYNOS_MUX_ADDR_VALUE 6
#define EXYNOS_MUX_ADDR_SHIFT 20
#define EXYNOS_TMU_TRIP_MODE_SHIFT 13
......@@ -94,11 +94,20 @@
#define SENSOR_NAME_LEN 16
#define MAX_TRIP_COUNT 8
#define MAX_COOLING_DEVICE 4
#define MAX_THRESHOLD_LEVS 4
#define ACTIVE_INTERVAL 500
#define IDLE_INTERVAL 10000
#define MCELSIUS 1000
#ifdef CONFIG_EXYNOS_THERMAL_EMUL
#define EXYNOS_EMUL_TIME 0x57F0
#define EXYNOS_EMUL_TIME_SHIFT 16
#define EXYNOS_EMUL_DATA_SHIFT 8
#define EXYNOS_EMUL_DATA_MASK 0xFF
#define EXYNOS_EMUL_ENABLE 0x1
#endif /* CONFIG_EXYNOS_THERMAL_EMUL */
/* CPU Zone information */
#define PANIC_ZONE 4
#define WARN_ZONE 3
......@@ -125,6 +134,7 @@ struct exynos_tmu_data {
struct thermal_trip_point_conf {
int trip_val[MAX_TRIP_COUNT];
int trip_count;
u8 trigger_falling;
};
struct thermal_cooling_conf {
......@@ -174,7 +184,8 @@ static int exynos_set_mode(struct thermal_zone_device *thermal,
mutex_lock(&th_zone->therm_dev->lock);
if (mode == THERMAL_DEVICE_ENABLED)
if (mode == THERMAL_DEVICE_ENABLED &&
!th_zone->sensor_conf->trip_data.trigger_falling)
th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
else
th_zone->therm_dev->polling_delay = 0;
......@@ -284,7 +295,7 @@ static int exynos_bind(struct thermal_zone_device *thermal,
case MONITOR_ZONE:
case WARN_ZONE:
if (thermal_zone_bind_cooling_device(thermal, i, cdev,
level, level)) {
level, 0)) {
pr_err("error binding cdev inst %d\n", i);
ret = -EINVAL;
}
......@@ -362,10 +373,17 @@ static int exynos_get_temp(struct thermal_zone_device *thermal,
static int exynos_get_trend(struct thermal_zone_device *thermal,
int trip, enum thermal_trend *trend)
{
if (thermal->temperature >= trip)
*trend = THERMAL_TREND_RAISING;
int ret;
unsigned long trip_temp;
ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
if (ret < 0)
return ret;
if (thermal->temperature >= trip_temp)
*trend = THERMAL_TREND_RAISE_FULL;
else
*trend = THERMAL_TREND_DROPPING;
*trend = THERMAL_TREND_DROP_FULL;
return 0;
}
......@@ -413,7 +431,8 @@ static void exynos_report_trigger(void)
break;
}
if (th_zone->mode == THERMAL_DEVICE_ENABLED) {
if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
!th_zone->sensor_conf->trip_data.trigger_falling) {
if (i > 0)
th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
else
......@@ -452,7 +471,8 @@ static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
th_zone->therm_dev = thermal_zone_device_register(sensor_conf->name,
EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, NULL, 0,
IDLE_INTERVAL);
sensor_conf->trip_data.trigger_falling ?
0 : IDLE_INTERVAL);
if (IS_ERR(th_zone->therm_dev)) {
pr_err("Failed to register thermal zone device\n");
......@@ -559,8 +579,9 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
struct exynos_tmu_platform_data *pdata = data->pdata;
unsigned int status, trim_info, rising_threshold;
int ret = 0, threshold_code;
unsigned int status, trim_info;
unsigned int rising_threshold = 0, falling_threshold = 0;
int ret = 0, threshold_code, i, trigger_levs = 0;
mutex_lock(&data->lock);
clk_enable(data->clk);
......@@ -585,6 +606,11 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
(data->temp_error2 != 0))
data->temp_error1 = pdata->efuse_value;
/* Count trigger levels to be enabled */
for (i = 0; i < MAX_THRESHOLD_LEVS; i++)
if (pdata->trigger_levels[i])
trigger_levs++;
if (data->soc == SOC_ARCH_EXYNOS4210) {
/* Write temperature code for threshold */
threshold_code = temp_to_code(data, pdata->threshold);
......@@ -594,44 +620,38 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
}
writeb(threshold_code,
data->base + EXYNOS4210_TMU_REG_THRESHOLD_TEMP);
writeb(pdata->trigger_levels[0],
data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL0);
writeb(pdata->trigger_levels[1],
data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL1);
writeb(pdata->trigger_levels[2],
data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL2);
writeb(pdata->trigger_levels[3],
data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL3);
for (i = 0; i < trigger_levs; i++)
writeb(pdata->trigger_levels[i],
data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL0 + i * 4);
writel(EXYNOS4210_TMU_INTCLEAR_VAL,
data->base + EXYNOS_TMU_REG_INTCLEAR);
} else if (data->soc == SOC_ARCH_EXYNOS) {
/* Write temperature code for threshold */
threshold_code = temp_to_code(data, pdata->trigger_levels[0]);
if (threshold_code < 0) {
ret = threshold_code;
goto out;
}
rising_threshold = threshold_code;
threshold_code = temp_to_code(data, pdata->trigger_levels[1]);
if (threshold_code < 0) {
ret = threshold_code;
goto out;
}
rising_threshold |= (threshold_code << 8);
threshold_code = temp_to_code(data, pdata->trigger_levels[2]);
if (threshold_code < 0) {
ret = threshold_code;
goto out;
/* Write temperature code for rising and falling threshold */
for (i = 0; i < trigger_levs; i++) {
threshold_code = temp_to_code(data,
pdata->trigger_levels[i]);
if (threshold_code < 0) {
ret = threshold_code;
goto out;
}
rising_threshold |= threshold_code << 8 * i;
if (pdata->threshold_falling) {
threshold_code = temp_to_code(data,
pdata->trigger_levels[i] -
pdata->threshold_falling);
if (threshold_code > 0)
falling_threshold |=
threshold_code << 8 * i;
}
}
rising_threshold |= (threshold_code << 16);
writel(rising_threshold,
data->base + EXYNOS_THD_TEMP_RISE);
writel(0, data->base + EXYNOS_THD_TEMP_FALL);
writel(falling_threshold,
data->base + EXYNOS_THD_TEMP_FALL);
writel(EXYNOS_TMU_CLEAR_RISE_INT|EXYNOS_TMU_CLEAR_FALL_INT,
writel(EXYNOS_TMU_CLEAR_RISE_INT | EXYNOS_TMU_CLEAR_FALL_INT,
data->base + EXYNOS_TMU_REG_INTCLEAR);
}
out:
......@@ -664,6 +684,8 @@ static void exynos_tmu_control(struct platform_device *pdev, bool on)
pdata->trigger_level2_en << 8 |
pdata->trigger_level1_en << 4 |
pdata->trigger_level0_en;
if (pdata->threshold_falling)
interrupt_en |= interrupt_en << 16;
} else {
con |= EXYNOS_TMU_CORE_OFF;
interrupt_en = 0; /* Disable all interrupts */
......@@ -697,20 +719,19 @@ static void exynos_tmu_work(struct work_struct *work)
struct exynos_tmu_data *data = container_of(work,
struct exynos_tmu_data, irq_work);
exynos_report_trigger();
mutex_lock(&data->lock);
clk_enable(data->clk);
if (data->soc == SOC_ARCH_EXYNOS)
writel(EXYNOS_TMU_CLEAR_RISE_INT,
writel(EXYNOS_TMU_CLEAR_RISE_INT |
EXYNOS_TMU_CLEAR_FALL_INT,
data->base + EXYNOS_TMU_REG_INTCLEAR);
else
writel(EXYNOS4210_TMU_INTCLEAR_VAL,
data->base + EXYNOS_TMU_REG_INTCLEAR);
clk_disable(data->clk);
mutex_unlock(&data->lock);
exynos_report_trigger();
enable_irq(data->irq);
}
......@@ -759,6 +780,7 @@ static struct exynos_tmu_platform_data const exynos4210_default_tmu_data = {
#if defined(CONFIG_SOC_EXYNOS5250) || defined(CONFIG_SOC_EXYNOS4412)
static struct exynos_tmu_platform_data const exynos_default_tmu_data = {
.threshold_falling = 10,
.trigger_levels[0] = 85,
.trigger_levels[1] = 103,
.trigger_levels[2] = 110,
......@@ -800,8 +822,6 @@ static const struct of_device_id exynos_tmu_match[] = {
{},
};
MODULE_DEVICE_TABLE(of, exynos_tmu_match);
#else
#define exynos_tmu_match NULL
#endif
static struct platform_device_id exynos_tmu_driver_ids[] = {
......@@ -832,6 +852,94 @@ static inline struct exynos_tmu_platform_data *exynos_get_driver_data(
return (struct exynos_tmu_platform_data *)
platform_get_device_id(pdev)->driver_data;
}
#ifdef CONFIG_EXYNOS_THERMAL_EMUL
static ssize_t exynos_tmu_emulation_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct platform_device *pdev = container_of(dev,
struct platform_device, dev);
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
unsigned int reg;
u8 temp_code;
int temp = 0;
if (data->soc == SOC_ARCH_EXYNOS4210)
goto out;
mutex_lock(&data->lock);
clk_enable(data->clk);
reg = readl(data->base + EXYNOS_EMUL_CON);
clk_disable(data->clk);
mutex_unlock(&data->lock);
if (reg & EXYNOS_EMUL_ENABLE) {
reg >>= EXYNOS_EMUL_DATA_SHIFT;
temp_code = reg & EXYNOS_EMUL_DATA_MASK;
temp = code_to_temp(data, temp_code);
}
out:
return sprintf(buf, "%d\n", temp * MCELSIUS);
}
static ssize_t exynos_tmu_emulation_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct platform_device *pdev = container_of(dev,
struct platform_device, dev);
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
unsigned int reg;
int temp;
if (data->soc == SOC_ARCH_EXYNOS4210)
goto out;
if (!sscanf(buf, "%d\n", &temp) || temp < 0)
return -EINVAL;
mutex_lock(&data->lock);
clk_enable(data->clk);
reg = readl(data->base + EXYNOS_EMUL_CON);
if (temp) {
/* Both CELSIUS and MCELSIUS type are available for input */
if (temp > MCELSIUS)
temp /= MCELSIUS;
reg = (EXYNOS_EMUL_TIME << EXYNOS_EMUL_TIME_SHIFT) |
(temp_to_code(data, (temp / MCELSIUS))
<< EXYNOS_EMUL_DATA_SHIFT) | EXYNOS_EMUL_ENABLE;
} else {
reg &= ~EXYNOS_EMUL_ENABLE;
}
writel(reg, data->base + EXYNOS_EMUL_CON);
clk_disable(data->clk);
mutex_unlock(&data->lock);
out:
return count;
}
static DEVICE_ATTR(emulation, 0644, exynos_tmu_emulation_show,
exynos_tmu_emulation_store);
static int create_emulation_sysfs(struct device *dev)
{
return device_create_file(dev, &dev_attr_emulation);
}
static void remove_emulation_sysfs(struct device *dev)
{
device_remove_file(dev, &dev_attr_emulation);
}
#else
static inline int create_emulation_sysfs(struct device *dev) { return 0; }
static inline void remove_emulation_sysfs(struct device *dev) {}
#endif
static int exynos_tmu_probe(struct platform_device *pdev)
{
struct exynos_tmu_data *data;
......@@ -914,6 +1022,8 @@ static int exynos_tmu_probe(struct platform_device *pdev)
exynos_sensor_conf.trip_data.trip_val[i] =
pdata->threshold + pdata->trigger_levels[i];
exynos_sensor_conf.trip_data.trigger_falling = pdata->threshold_falling;
exynos_sensor_conf.cooling_data.freq_clip_count =
pdata->freq_tab_count;
for (i = 0; i < pdata->freq_tab_count; i++) {
......@@ -928,6 +1038,11 @@ static int exynos_tmu_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Failed to register thermal interface\n");
goto err_clk;
}
ret = create_emulation_sysfs(&pdev->dev);
if (ret)
dev_err(&pdev->dev, "Failed to create emulation mode sysfs node\n");
return 0;
err_clk:
platform_set_drvdata(pdev, NULL);
......@@ -939,6 +1054,8 @@ static int exynos_tmu_remove(struct platform_device *pdev)
{
struct exynos_tmu_data *data = platform_get_drvdata(pdev);
remove_emulation_sysfs(&pdev->dev);
exynos_tmu_control(pdev, false);
exynos_unregister_thermal();
......@@ -980,7 +1097,7 @@ static struct platform_driver exynos_tmu_driver = {
.name = "exynos-tmu",
.owner = THIS_MODULE,
.pm = EXYNOS_TMU_PM,
.of_match_table = exynos_tmu_match,
.of_match_table = of_match_ptr(exynos_tmu_match),
},
.probe = exynos_tmu_probe,
.remove = exynos_tmu_remove,
......
drivers/thermal/intel_powerclamp.c 0 → 100644
View file @ 2af78448
/*
* intel_powerclamp.c - package c-state idle injection
*
* Copyright (c) 2012, Intel Corporation.
*
* Authors:
* Arjan van de Ven <arjan@linux.intel.com>
* Jacob Pan <jacob.jun.pan@linux.intel.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*
* TODO:
* 1. better handle wakeup from external interrupts, currently a fixed
* compensation is added to clamping duration when excessive amount
* of wakeups are observed during idle time. the reason is that in
* case of external interrupts without need for ack, clamping down
* cpu in non-irq context does not reduce irq. for majority of the
* cases, clamping down cpu does help reduce irq as well, we should
* be able to differenciate the two cases and give a quantitative
* solution for the irqs that we can control. perhaps based on
* get_cpu_iowait_time_us()
*
* 2. synchronization with other hw blocks
*
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/cpu.h>
#include <linux/thermal.h>
#include <linux/slab.h>
#include <linux/tick.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <asm/nmi.h>
#include <asm/msr.h>
#include <asm/mwait.h>
#include <asm/cpu_device_id.h>
#include <asm/idle.h>
#include <asm/hardirq.h>
#define MAX_TARGET_RATIO (50U)
/* For each undisturbed clamping period (no extra wake ups during idle time),
* we increment the confidence counter for the given target ratio.
* CONFIDENCE_OK defines the level where runtime calibration results are
* valid.
*/
#define CONFIDENCE_OK (3)
/* Default idle injection duration, driver adjust sleep time to meet target
* idle ratio. Similar to frequency modulation.
*/
#define DEFAULT_DURATION_JIFFIES (6)
static unsigned int target_mwait;
static struct dentry *debug_dir;
/* user selected target */
static unsigned int set_target_ratio;
static unsigned int current_ratio;
static bool should_skip;
static bool reduce_irq;
static atomic_t idle_wakeup_counter;
static unsigned int control_cpu; /* The cpu assigned to collect stat and update
* control parameters. default to BSP but BSP
* can be offlined.
*/
static bool clamping;
static struct task_struct * __percpu *powerclamp_thread;
static struct thermal_cooling_device *cooling_dev;
static unsigned long *cpu_clamping_mask; /* bit map for tracking per cpu
* clamping thread
*/
static unsigned int duration;
static unsigned int pkg_cstate_ratio_cur;
static unsigned int window_size;
static int duration_set(const char *arg, const struct kernel_param *kp)
{
int ret = 0;
unsigned long new_duration;
ret = kstrtoul(arg, 10, &new_duration);
if (ret)
goto exit;
if (new_duration > 25 || new_duration < 6) {
pr_err("Out of recommended range %lu, between 6-25ms\n",
new_duration);
ret = -EINVAL;
}
duration = clamp(new_duration, 6ul, 25ul);
smp_mb();
exit:
return ret;
}
static struct kernel_param_ops duration_ops = {
.set = duration_set,
.get = param_get_int,
};
module_param_cb(duration, &duration_ops, &duration, 0644);
MODULE_PARM_DESC(duration, "forced idle time for each attempt in msec.");
struct powerclamp_calibration_data {
unsigned long confidence; /* used for calibration, basically a counter
* gets incremented each time a clamping
* period is completed without extra wakeups
* once that counter is reached given level,
* compensation is deemed usable.
*/
unsigned long steady_comp; /* steady state compensation used when
* no extra wakeups occurred.
*/
unsigned long dynamic_comp; /* compensate excessive wakeup from idle
* mostly from external interrupts.
*/
};
static struct powerclamp_calibration_data cal_data[MAX_TARGET_RATIO];
static int window_size_set(const char *arg, const struct kernel_param *kp)
{
int ret = 0;
unsigned long new_window_size;
ret = kstrtoul(arg, 10, &new_window_size);
if (ret)
goto exit_win;
if (new_window_size > 10 || new_window_size < 2) {
pr_err("Out of recommended window size %lu, between 2-10\n",
new_window_size);
ret = -EINVAL;
}
window_size = clamp(new_window_size, 2ul, 10ul);
smp_mb();
exit_win:
return ret;
}
static struct kernel_param_ops window_size_ops = {
.set = window_size_set,
.get = param_get_int,
};
module_param_cb(window_size, &window_size_ops, &window_size, 0644);
MODULE_PARM_DESC(window_size, "sliding window in number of clamping cycles\n"
"\tpowerclamp controls idle ratio within this window. larger\n"
"\twindow size results in slower response time but more smooth\n"
"\tclamping results. default to 2.");
static void find_target_mwait(void)
{
unsigned int eax, ebx, ecx, edx;
unsigned int highest_cstate = 0;
unsigned int highest_subcstate = 0;
int i;
if (boot_cpu_data.cpuid_level < CPUID_MWAIT_LEAF)
return;
cpuid(CPUID_MWAIT_LEAF, &eax, &ebx, &ecx, &edx);
if (!(ecx & CPUID5_ECX_EXTENSIONS_SUPPORTED) ||
!(ecx & CPUID5_ECX_INTERRUPT_BREAK))
return;
edx >>= MWAIT_SUBSTATE_SIZE;
for (i = 0; i < 7 && edx; i++, edx >>= MWAIT_SUBSTATE_SIZE) {
if (edx & MWAIT_SUBSTATE_MASK) {
highest_cstate = i;
highest_subcstate = edx & MWAIT_SUBSTATE_MASK;
}
}
target_mwait = (highest_cstate << MWAIT_SUBSTATE_SIZE) |
(highest_subcstate - 1);
}
static u64 pkg_state_counter(void)
{
u64 val;
u64 count = 0;
static bool skip_c2;
static bool skip_c3;
static bool skip_c6;
static bool skip_c7;
if (!skip_c2) {
if (!rdmsrl_safe(MSR_PKG_C2_RESIDENCY, &val))
count += val;
else
skip_c2 = true;
}
if (!skip_c3) {
if (!rdmsrl_safe(MSR_PKG_C3_RESIDENCY, &val))
count += val;
else
skip_c3 = true;
}
if (!skip_c6) {
if (!rdmsrl_safe(MSR_PKG_C6_RESIDENCY, &val))
count += val;
else
skip_c6 = true;
}
if (!skip_c7) {
if (!rdmsrl_safe(MSR_PKG_C7_RESIDENCY, &val))
count += val;
else
skip_c7 = true;
}
return count;
}
static void noop_timer(unsigned long foo)
{
/* empty... just the fact that we get the interrupt wakes us up */
}
static unsigned int get_compensation(int ratio)
{
unsigned int comp = 0;
/* we only use compensation if all adjacent ones are good */
if (ratio == 1 &&
cal_data[ratio].confidence >= CONFIDENCE_OK &&
cal_data[ratio + 1].confidence >= CONFIDENCE_OK &&
cal_data[ratio + 2].confidence >= CONFIDENCE_OK) {
comp = (cal_data[ratio].steady_comp +
cal_data[ratio + 1].steady_comp +
cal_data[ratio + 2].steady_comp) / 3;
} else if (ratio == MAX_TARGET_RATIO - 1 &&
cal_data[ratio].confidence >= CONFIDENCE_OK &&
cal_data[ratio - 1].confidence >= CONFIDENCE_OK &&
cal_data[ratio - 2].confidence >= CONFIDENCE_OK) {
comp = (cal_data[ratio].steady_comp +
cal_data[ratio - 1].steady_comp +
cal_data[ratio - 2].steady_comp) / 3;
} else if (cal_data[ratio].confidence >= CONFIDENCE_OK &&
cal_data[ratio - 1].confidence >= CONFIDENCE_OK &&
cal_data[ratio + 1].confidence >= CONFIDENCE_OK) {
comp = (cal_data[ratio].steady_comp +
cal_data[ratio - 1].steady_comp +
cal_data[ratio + 1].steady_comp) / 3;
}
/* REVISIT: simple penalty of double idle injection */
if (reduce_irq)
comp = ratio;
/* do not exceed limit */
if (comp + ratio >= MAX_TARGET_RATIO)
comp = MAX_TARGET_RATIO - ratio - 1;
return comp;
}
static void adjust_compensation(int target_ratio, unsigned int win)
{
int delta;
struct powerclamp_calibration_data *d = &cal_data[target_ratio];
/*
* adjust compensations if confidence level has not been reached or
* there are too many wakeups during the last idle injection period, we
* cannot trust the data for compensation.
*/
if (d->confidence >= CONFIDENCE_OK ||
atomic_read(&idle_wakeup_counter) >
win * num_online_cpus())
return;
delta = set_target_ratio - current_ratio;
/* filter out bad data */
if (delta >= 0 && delta <= (1+target_ratio/10)) {
if (d->steady_comp)
d->steady_comp =
roundup(delta+d->steady_comp, 2)/2;
else
d->steady_comp = delta;
d->confidence++;
}
}
static bool powerclamp_adjust_controls(unsigned int target_ratio,
unsigned int guard, unsigned int win)
{
static u64 msr_last, tsc_last;
u64 msr_now, tsc_now;
u64 val64;
/* check result for the last window */
msr_now = pkg_state_counter();
rdtscll(tsc_now);
/* calculate pkg cstate vs tsc ratio */
if (!msr_last || !tsc_last)
current_ratio = 1;
else if (tsc_now-tsc_last) {
val64 = 100*(msr_now-msr_last);
do_div(val64, (tsc_now-tsc_last));
current_ratio = val64;
}
/* update record */
msr_last = msr_now;
tsc_last = tsc_now;
adjust_compensation(target_ratio, win);
/*
* too many external interrupts, set flag such
* that we can take measure later.
*/
reduce_irq = atomic_read(&idle_wakeup_counter) >=
2 * win * num_online_cpus();
atomic_set(&idle_wakeup_counter, 0);
/* if we are above target+guard, skip */
return set_target_ratio + guard <= current_ratio;
}
static int clamp_thread(void *arg)
{
int cpunr = (unsigned long)arg;
DEFINE_TIMER(wakeup_timer, noop_timer, 0, 0);
static const struct sched_param param = {
.sched_priority = MAX_USER_RT_PRIO/2,
};
unsigned int count = 0;
unsigned int target_ratio;
set_bit(cpunr, cpu_clamping_mask);
set_freezable();
init_timer_on_stack(&wakeup_timer);
sched_setscheduler(current, SCHED_FIFO, &param);
while (true == clamping && !kthread_should_stop() &&
cpu_online(cpunr)) {
int sleeptime;
unsigned long target_jiffies;
unsigned int guard;
unsigned int compensation = 0;
int interval; /* jiffies to sleep for each attempt */
unsigned int duration_jiffies = msecs_to_jiffies(duration);
unsigned int window_size_now;
try_to_freeze();
/*
* make sure user selected ratio does not take effect until
* the next round. adjust target_ratio if user has changed
* target such that we can converge quickly.
*/
target_ratio = set_target_ratio;
guard = 1 + target_ratio/20;
window_size_now = window_size;
count++;
/*
* systems may have different ability to enter package level
* c-states, thus we need to compensate the injected idle ratio
* to achieve the actual target reported by the HW.
*/
compensation = get_compensation(target_ratio);
interval = duration_jiffies*100/(target_ratio+compensation);
/* align idle time */
target_jiffies = roundup(jiffies, interval);
sleeptime = target_jiffies - jiffies;
if (sleeptime <= 0)
sleeptime = 1;
schedule_timeout_interruptible(sleeptime);
/*
* only elected controlling cpu can collect stats and update
* control parameters.
*/
if (cpunr == control_cpu && !(count%window_size_now)) {
should_skip =
powerclamp_adjust_controls(target_ratio,
guard, window_size_now);
smp_mb();
}
if (should_skip)
continue;
target_jiffies = jiffies + duration_jiffies;
mod_timer(&wakeup_timer, target_jiffies);
if (unlikely(local_softirq_pending()))
continue;
/*
* stop tick sched during idle time, interrupts are still
* allowed. thus jiffies are updated properly.
*/
preempt_disable();
tick_nohz_idle_enter();
/* mwait until target jiffies is reached */
while (time_before(jiffies, target_jiffies)) {
unsigned long ecx = 1;
unsigned long eax = target_mwait;
/*
* REVISIT: may call enter_idle() to notify drivers who
* can save power during cpu idle. same for exit_idle()
*/
local_touch_nmi();
stop_critical_timings();
__monitor((void *)&current_thread_info()->flags, 0, 0);
cpu_relax(); /* allow HT sibling to run */
__mwait(eax, ecx);
start_critical_timings();
atomic_inc(&idle_wakeup_counter);
}
tick_nohz_idle_exit();
preempt_enable_no_resched();
}
del_timer_sync(&wakeup_timer);
clear_bit(cpunr, cpu_clamping_mask);
return 0;
}
/*
* 1 HZ polling while clamping is active, useful for userspace
* to monitor actual idle ratio.
*/
static void poll_pkg_cstate(struct work_struct *dummy);
static DECLARE_DELAYED_WORK(poll_pkg_cstate_work, poll_pkg_cstate);
static void poll_pkg_cstate(struct work_struct *dummy)
{
static u64 msr_last;
static u64 tsc_last;
static unsigned long jiffies_last;
u64 msr_now;
unsigned long jiffies_now;
u64 tsc_now;
u64 val64;
msr_now = pkg_state_counter();
rdtscll(tsc_now);
jiffies_now = jiffies;
/* calculate pkg cstate vs tsc ratio */
if (!msr_last || !tsc_last)
pkg_cstate_ratio_cur = 1;
else {
if (tsc_now - tsc_last) {
val64 = 100 * (msr_now - msr_last);
do_div(val64, (tsc_now - tsc_last));
pkg_cstate_ratio_cur = val64;
}
}
/* update record */
msr_last = msr_now;
jiffies_last = jiffies_now;
tsc_last = tsc_now;
if (true == clamping)
schedule_delayed_work(&poll_pkg_cstate_work, HZ);
}
static int start_power_clamp(void)
{
unsigned long cpu;
struct task_struct *thread;
/* check if pkg cstate counter is completely 0, abort in this case */
if (!pkg_state_counter()) {
pr_err("pkg cstate counter not functional, abort\n");
return -EINVAL;
}
set_target_ratio = clamp(set_target_ratio, 0U, MAX_TARGET_RATIO - 1);
/* prevent cpu hotplug */
get_online_cpus();
/* prefer BSP */
control_cpu = 0;
if (!cpu_online(control_cpu))
control_cpu = smp_processor_id();
clamping = true;
schedule_delayed_work(&poll_pkg_cstate_work, 0);
/* start one thread per online cpu */
for_each_online_cpu(cpu) {
struct task_struct **p =
per_cpu_ptr(powerclamp_thread, cpu);
thread = kthread_create_on_node(clamp_thread,
(void *) cpu,
cpu_to_node(cpu),
"kidle_inject/%ld", cpu);
/* bind to cpu here */
if (likely(!IS_ERR(thread))) {
kthread_bind(thread, cpu);
wake_up_process(thread);
*p = thread;
}
}
put_online_cpus();
return 0;
}
static void end_power_clamp(void)
{
int i;
struct task_struct *thread;
clamping = false;
/*
* make clamping visible to other cpus and give per cpu clamping threads
* sometime to exit, or gets killed later.
*/
smp_mb();
msleep(20);
if (bitmap_weight(cpu_clamping_mask, num_possible_cpus())) {
for_each_set_bit(i, cpu_clamping_mask, num_possible_cpus()) {
pr_debug("clamping thread for cpu %d alive, kill\n", i);
thread = *per_cpu_ptr(powerclamp_thread, i);
kthread_stop(thread);
}
}
}
static int powerclamp_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned long cpu = (unsigned long)hcpu;
struct task_struct *thread;
struct task_struct **percpu_thread =
per_cpu_ptr(powerclamp_thread, cpu);
if (false == clamping)
goto exit_ok;
switch (action) {
case CPU_ONLINE:
thread = kthread_create_on_node(clamp_thread,
(void *) cpu,
cpu_to_node(cpu),
"kidle_inject/%lu", cpu);
if (likely(!IS_ERR(thread))) {
kthread_bind(thread, cpu);
wake_up_process(thread);
*percpu_thread = thread;
}
/* prefer BSP as controlling CPU */
if (cpu == 0) {
control_cpu = 0;
smp_mb();
}
break;
case CPU_DEAD:
if (test_bit(cpu, cpu_clamping_mask)) {
pr_err("cpu %lu dead but powerclamping thread is not\n",
cpu);
kthread_stop(*percpu_thread);
}
if (cpu == control_cpu) {
control_cpu = smp_processor_id();
smp_mb();
}
}
exit_ok:
return NOTIFY_OK;
}
static struct notifier_block powerclamp_cpu_notifier = {
.notifier_call = powerclamp_cpu_callback,
};
static int powerclamp_get_max_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
*state = MAX_TARGET_RATIO;
return 0;
}
static int powerclamp_get_cur_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
if (true == clamping)
*state = pkg_cstate_ratio_cur;
else
/* to save power, do not poll idle ratio while not clamping */
*state = -1; /* indicates invalid state */
return 0;
}
static int powerclamp_set_cur_state(struct thermal_cooling_device *cdev,
unsigned long new_target_ratio)
{
int ret = 0;
new_target_ratio = clamp(new_target_ratio, 0UL,
(unsigned long) (MAX_TARGET_RATIO-1));
if (set_target_ratio == 0 && new_target_ratio > 0) {
pr_info("Start idle injection to reduce power\n");
set_target_ratio = new_target_ratio;
ret = start_power_clamp();
goto exit_set;
} else if (set_target_ratio > 0 && new_target_ratio == 0) {
pr_info("Stop forced idle injection\n");
set_target_ratio = 0;
end_power_clamp();
} else /* adjust currently running */ {
set_target_ratio = new_target_ratio;
/* make new set_target_ratio visible to other cpus */
smp_mb();
}
exit_set:
return ret;
}
/* bind to generic thermal layer as cooling device*/
static struct thermal_cooling_device_ops powerclamp_cooling_ops = {
.get_max_state = powerclamp_get_max_state,
.get_cur_state = powerclamp_get_cur_state,
.set_cur_state = powerclamp_set_cur_state,
};
/* runs on Nehalem and later */
static const struct x86_cpu_id intel_powerclamp_ids[] = {
{ X86_VENDOR_INTEL, 6, 0x1a},
{ X86_VENDOR_INTEL, 6, 0x1c},
{ X86_VENDOR_INTEL, 6, 0x1e},
{ X86_VENDOR_INTEL, 6, 0x1f},
{ X86_VENDOR_INTEL, 6, 0x25},
{ X86_VENDOR_INTEL, 6, 0x26},
{ X86_VENDOR_INTEL, 6, 0x2a},
{ X86_VENDOR_INTEL, 6, 0x2c},
{ X86_VENDOR_INTEL, 6, 0x2d},
{ X86_VENDOR_INTEL, 6, 0x2e},
{ X86_VENDOR_INTEL, 6, 0x2f},
{ X86_VENDOR_INTEL, 6, 0x3a},
{}
};
MODULE_DEVICE_TABLE(x86cpu, intel_powerclamp_ids);
static int powerclamp_probe(void)
{
if (!x86_match_cpu(intel_powerclamp_ids)) {
pr_err("Intel powerclamp does not run on family %d model %d\n",
boot_cpu_data.x86, boot_cpu_data.x86_model);
return -ENODEV;
}
if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC) ||
!boot_cpu_has(X86_FEATURE_CONSTANT_TSC) ||
!boot_cpu_has(X86_FEATURE_MWAIT) ||
!boot_cpu_has(X86_FEATURE_ARAT))
return -ENODEV;
/* find the deepest mwait value */
find_target_mwait();
return 0;
}
static int powerclamp_debug_show(struct seq_file *m, void *unused)
{
int i = 0;
seq_printf(m, "controlling cpu: %d\n", control_cpu);
seq_printf(m, "pct confidence steady dynamic (compensation)\n");
for (i = 0; i < MAX_TARGET_RATIO; i++) {
seq_printf(m, "%d\t%lu\t%lu\t%lu\n",
i,
cal_data[i].confidence,
cal_data[i].steady_comp,
cal_data[i].dynamic_comp);
}
return 0;
}
static int powerclamp_debug_open(struct inode *inode,
struct file *file)
{
return single_open(file, powerclamp_debug_show, inode->i_private);
}
static const struct file_operations powerclamp_debug_fops = {
.open = powerclamp_debug_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.owner = THIS_MODULE,
};
static inline void powerclamp_create_debug_files(void)
{
debug_dir = debugfs_create_dir("intel_powerclamp", NULL);
if (!debug_dir)
return;
if (!debugfs_create_file("powerclamp_calib", S_IRUGO, debug_dir,
cal_data, &powerclamp_debug_fops))
goto file_error;
return;
file_error:
debugfs_remove_recursive(debug_dir);
}
static int powerclamp_init(void)
{
int retval;
int bitmap_size;
bitmap_size = BITS_TO_LONGS(num_possible_cpus()) * sizeof(long);
cpu_clamping_mask = kzalloc(bitmap_size, GFP_KERNEL);
if (!cpu_clamping_mask)
return -ENOMEM;
/* probe cpu features and ids here */
retval = powerclamp_probe();
if (retval)
return retval;
/* set default limit, maybe adjusted during runtime based on feedback */
window_size = 2;
register_hotcpu_notifier(&powerclamp_cpu_notifier);
powerclamp_thread = alloc_percpu(struct task_struct *);
cooling_dev = thermal_cooling_device_register("intel_powerclamp", NULL,
&powerclamp_cooling_ops);
if (IS_ERR(cooling_dev))
return -ENODEV;
if (!duration)
duration = jiffies_to_msecs(DEFAULT_DURATION_JIFFIES);
powerclamp_create_debug_files();
return 0;
}
module_init(powerclamp_init);
static void powerclamp_exit(void)
{
unregister_hotcpu_notifier(&powerclamp_cpu_notifier);
end_power_clamp();
free_percpu(powerclamp_thread);
thermal_cooling_device_unregister(cooling_dev);
kfree(cpu_clamping_mask);
cancel_delayed_work_sync(&poll_pkg_cstate_work);
debugfs_remove_recursive(debug_dir);
}
module_exit(powerclamp_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Arjan van de Ven <arjan@linux.intel.com>");
MODULE_AUTHOR("Jacob Pan <jacob.jun.pan@linux.intel.com>");
MODULE_DESCRIPTION("Package Level C-state Idle Injection for Intel CPUs");
drivers/thermal/kirkwood_thermal.c 0 → 100644
View file @ 2af78448
/*
* Kirkwood thermal sensor driver
*
* Copyright (C) 2012 Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>
#define KIRKWOOD_THERMAL_VALID_OFFSET 9
#define KIRKWOOD_THERMAL_VALID_MASK 0x1
#define KIRKWOOD_THERMAL_TEMP_OFFSET 10
#define KIRKWOOD_THERMAL_TEMP_MASK 0x1FF
/* Kirkwood Thermal Sensor Dev Structure */
struct kirkwood_thermal_priv {
void __iomem *sensor;
};
static int kirkwood_get_temp(struct thermal_zone_device *thermal,
unsigned long *temp)
{
unsigned long reg;
struct kirkwood_thermal_priv *priv = thermal->devdata;
reg = readl_relaxed(priv->sensor);
/* Valid check */
if (!(reg >> KIRKWOOD_THERMAL_VALID_OFFSET) &
KIRKWOOD_THERMAL_VALID_MASK) {
dev_err(&thermal->device,
"Temperature sensor reading not valid\n");
return -EIO;
}
/*
* Calculate temperature. See Section 8.10.1 of the 88AP510,
* datasheet, which has the same sensor.
* Documentation/arm/Marvell/README
*/
reg = (reg >> KIRKWOOD_THERMAL_TEMP_OFFSET) &
KIRKWOOD_THERMAL_TEMP_MASK;
*temp = ((2281638UL - (7298*reg)) / 10);
return 0;
}
static struct thermal_zone_device_ops ops = {
.get_temp = kirkwood_get_temp,
};
static const struct of_device_id kirkwood_thermal_id_table[] = {
{ .compatible = "marvell,kirkwood-thermal" },
{}
};
static int kirkwood_thermal_probe(struct platform_device *pdev)
{
struct thermal_zone_device *thermal = NULL;
struct kirkwood_thermal_priv *priv;
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Failed to get platform resource\n");
return -ENODEV;
}
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->sensor = devm_request_and_ioremap(&pdev->dev, res);
if (!priv->sensor) {
dev_err(&pdev->dev, "Failed to request_ioremap memory\n");
return -EADDRNOTAVAIL;
}
thermal = thermal_zone_device_register("kirkwood_thermal", 0, 0,
priv, &ops, NULL, 0, 0);
if (IS_ERR(thermal)) {
dev_err(&pdev->dev,
"Failed to register thermal zone device\n");
return PTR_ERR(thermal);
}
platform_set_drvdata(pdev, thermal);
return 0;
}
static int kirkwood_thermal_exit(struct platform_device *pdev)
{
struct thermal_zone_device *kirkwood_thermal =
platform_get_drvdata(pdev);
thermal_zone_device_unregister(kirkwood_thermal);
platform_set_drvdata(pdev, NULL);
return 0;
}
MODULE_DEVICE_TABLE(of, kirkwood_thermal_id_table);
static struct platform_driver kirkwood_thermal_driver = {
.probe = kirkwood_thermal_probe,
.remove = kirkwood_thermal_exit,
.driver = {
.name = "kirkwood_thermal",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(kirkwood_thermal_id_table),
},
};
module_platform_driver(kirkwood_thermal_driver);
MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu@nigauri.org>");
MODULE_DESCRIPTION("kirkwood thermal driver");
MODULE_LICENSE("GPL");
drivers/thermal/rcar_thermal.c
View file @ 2af78448
......@@ -19,225 +19,473 @@
*/
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/thermal.h>
#define THSCR 0x2c
#define THSSR 0x30
#define IDLE_INTERVAL 5000
#define COMMON_STR 0x00
#define COMMON_ENR 0x04
#define COMMON_INTMSK 0x0c
#define REG_POSNEG 0x20
#define REG_FILONOFF 0x28
#define REG_THSCR 0x2c
#define REG_THSSR 0x30
#define REG_INTCTRL 0x34
/* THSCR */
#define CPTAP 0xf
#define CPCTL (1 << 12)
/* THSSR */
#define CTEMP 0x3f
struct rcar_thermal_priv {
struct rcar_thermal_common {
void __iomem *base;
struct device *dev;
struct list_head head;
spinlock_t lock;
u32 comp;
};
struct rcar_thermal_priv {
void __iomem *base;
struct rcar_thermal_common *common;
struct thermal_zone_device *zone;
struct delayed_work work;
struct mutex lock;
struct list_head list;
int id;
int ctemp;
};
#define rcar_thermal_for_each_priv(pos, common) \
list_for_each_entry(pos, &common->head, list)
#define MCELSIUS(temp) ((temp) * 1000)
#define rcar_zone_to_priv(zone) (zone->devdata)
#define rcar_zone_to_priv(zone) ((zone)->devdata)
#define rcar_priv_to_dev(priv) ((priv)->common->dev)
#define rcar_has_irq_support(priv) ((priv)->common->base)
#define rcar_id_to_shift(priv) ((priv)->id * 8)
#ifdef DEBUG
# define rcar_force_update_temp(priv) 1
#else
# define rcar_force_update_temp(priv) 0
#endif
/*
* basic functions
*/
static u32 rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
#define rcar_thermal_common_read(c, r) \
_rcar_thermal_common_read(c, COMMON_ ##r)
static u32 _rcar_thermal_common_read(struct rcar_thermal_common *common,
u32 reg)
{
unsigned long flags;
u32 ret;
spin_lock_irqsave(&priv->lock, flags);
return ioread32(common->base + reg);
}
ret = ioread32(priv->base + reg);
#define rcar_thermal_common_write(c, r, d) \
_rcar_thermal_common_write(c, COMMON_ ##r, d)
static void _rcar_thermal_common_write(struct rcar_thermal_common *common,
u32 reg, u32 data)
{
iowrite32(data, common->base + reg);
}
spin_unlock_irqrestore(&priv->lock, flags);
#define rcar_thermal_common_bset(c, r, m, d) \
_rcar_thermal_common_bset(c, COMMON_ ##r, m, d)
static void _rcar_thermal_common_bset(struct rcar_thermal_common *common,
u32 reg, u32 mask, u32 data)
{
u32 val;
return ret;
val = ioread32(common->base + reg);
val &= ~mask;
val |= (data & mask);
iowrite32(val, common->base + reg);
}
#if 0 /* no user at this point */
static void rcar_thermal_write(struct rcar_thermal_priv *priv,
u32 reg, u32 data)
#define rcar_thermal_read(p, r) _rcar_thermal_read(p, REG_ ##r)
static u32 _rcar_thermal_read(struct rcar_thermal_priv *priv, u32 reg)
{
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
return ioread32(priv->base + reg);
}
#define rcar_thermal_write(p, r, d) _rcar_thermal_write(p, REG_ ##r, d)
static void _rcar_thermal_write(struct rcar_thermal_priv *priv,
u32 reg, u32 data)
{
iowrite32(data, priv->base + reg);
spin_unlock_irqrestore(&priv->lock, flags);
}
#endif
static void rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
u32 mask, u32 data)
#define rcar_thermal_bset(p, r, m, d) _rcar_thermal_bset(p, REG_ ##r, m, d)
static void _rcar_thermal_bset(struct rcar_thermal_priv *priv, u32 reg,
u32 mask, u32 data)
{
unsigned long flags;
u32 val;
spin_lock_irqsave(&priv->lock, flags);
val = ioread32(priv->base + reg);
val &= ~mask;
val |= (data & mask);
iowrite32(val, priv->base + reg);
spin_unlock_irqrestore(&priv->lock, flags);
}
/*
* zone device functions
*/
static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
unsigned long *temp)
static int rcar_thermal_update_temp(struct rcar_thermal_priv *priv)
{
struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
int val, min, max, tmp;
tmp = -200; /* default */
while (1) {
if (priv->comp < 1 || priv->comp > 12) {
dev_err(priv->dev,
"THSSR invalid data (%d)\n", priv->comp);
priv->comp = 4; /* for next thermal */
return -EINVAL;
}
struct device *dev = rcar_priv_to_dev(priv);
int i;
int ctemp, old, new;
/*
* THS comparator offset and the reference temperature
*
* Comparator | reference | Temperature field
* offset | temperature | measurement
* | (degrees C) | (degrees C)
* -------------+---------------+-------------------
* 1 | -45 | -45 to -30
* 2 | -30 | -30 to -15
* 3 | -15 | -15 to 0
* 4 | 0 | 0 to +15
* 5 | +15 | +15 to +30
* 6 | +30 | +30 to +45
* 7 | +45 | +45 to +60
* 8 | +60 | +60 to +75
* 9 | +75 | +75 to +90
* 10 | +90 | +90 to +105
* 11 | +105 | +105 to +120
* 12 | +120 | +120 to +135
*/
mutex_lock(&priv->lock);
/* calculate thermal limitation */
min = (priv->comp * 15) - 60;
max = min + 15;
/*
* TSC decides a value of CPTAP automatically,
* and this is the conditions which validate interrupt.
*/
rcar_thermal_bset(priv, THSCR, CPCTL, CPCTL);
ctemp = 0;
old = ~0;
for (i = 0; i < 128; i++) {
/*
* we need to wait 300us after changing comparator offset
* to get stable temperature.
* see "Usage Notes" on datasheet
*/
rcar_thermal_bset(priv, THSCR, CPTAP, priv->comp);
udelay(300);
/* calculate current temperature */
val = rcar_thermal_read(priv, THSSR) & CTEMP;
val = (val * 5) - 65;
new = rcar_thermal_read(priv, THSSR) & CTEMP;
if (new == old) {
ctemp = new;
break;
}
old = new;
}
dev_dbg(priv->dev, "comp/min/max/val = %d/%d/%d/%d\n",
priv->comp, min, max, val);
if (!ctemp) {
dev_err(dev, "thermal sensor was broken\n");
return -EINVAL;
}
/*
* If val is same as min/max, then,
* it should try again on next comparator.
* But the val might be correct temperature.
* Keep it on "tmp" and compare with next val.
*/
if (tmp == val)
break;
/*
* enable IRQ
*/
if (rcar_has_irq_support(priv)) {
rcar_thermal_write(priv, FILONOFF, 0);
if (val <= min) {
tmp = min;
priv->comp--; /* try again */
} else if (val >= max) {
tmp = max;
priv->comp++; /* try again */
} else {
tmp = val;
break;
}
/* enable Rising/Falling edge interrupt */
rcar_thermal_write(priv, POSNEG, 0x1);
rcar_thermal_write(priv, INTCTRL, (((ctemp - 0) << 8) |
((ctemp - 1) << 0)));
}
dev_dbg(dev, "thermal%d %d -> %d\n", priv->id, priv->ctemp, ctemp);
priv->ctemp = ctemp;
mutex_unlock(&priv->lock);
return 0;
}
static int rcar_thermal_get_temp(struct thermal_zone_device *zone,
unsigned long *temp)
{
struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
if (!rcar_has_irq_support(priv) || rcar_force_update_temp(priv))
rcar_thermal_update_temp(priv);
mutex_lock(&priv->lock);
*temp = MCELSIUS((priv->ctemp * 5) - 65);
mutex_unlock(&priv->lock);
return 0;
}
static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
int trip, enum thermal_trip_type *type)
{
struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
struct device *dev = rcar_priv_to_dev(priv);
/* see rcar_thermal_get_temp() */
switch (trip) {
case 0: /* +90 <= temp */
*type = THERMAL_TRIP_CRITICAL;
break;
default:
dev_err(dev, "rcar driver trip error\n");
return -EINVAL;
}
return 0;
}
static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
int trip, unsigned long *temp)
{
struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
struct device *dev = rcar_priv_to_dev(priv);
/* see rcar_thermal_get_temp() */
switch (trip) {
case 0: /* +90 <= temp */
*temp = MCELSIUS(90);
break;
default:
dev_err(dev, "rcar driver trip error\n");
return -EINVAL;
}
return 0;
}
static int rcar_thermal_notify(struct thermal_zone_device *zone,
int trip, enum thermal_trip_type type)
{
struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
struct device *dev = rcar_priv_to_dev(priv);
switch (type) {
case THERMAL_TRIP_CRITICAL:
/* FIXME */
dev_warn(dev, "Thermal reached to critical temperature\n");
break;
default:
break;
}
*temp = MCELSIUS(tmp);
return 0;
}
static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
.get_temp = rcar_thermal_get_temp,
.get_temp = rcar_thermal_get_temp,
.get_trip_type = rcar_thermal_get_trip_type,
.get_trip_temp = rcar_thermal_get_trip_temp,
.notify = rcar_thermal_notify,
};
/*
* platform functions
* interrupt
*/
static int rcar_thermal_probe(struct platform_device *pdev)
#define rcar_thermal_irq_enable(p) _rcar_thermal_irq_ctrl(p, 1)
#define rcar_thermal_irq_disable(p) _rcar_thermal_irq_ctrl(p, 0)
static void _rcar_thermal_irq_ctrl(struct rcar_thermal_priv *priv, int enable)
{
struct rcar_thermal_common *common = priv->common;
unsigned long flags;
u32 mask = 0x3 << rcar_id_to_shift(priv); /* enable Rising/Falling */
spin_lock_irqsave(&common->lock, flags);
rcar_thermal_common_bset(common, INTMSK, mask, enable ? 0 : mask);
spin_unlock_irqrestore(&common->lock, flags);
}
static void rcar_thermal_work(struct work_struct *work)
{
struct thermal_zone_device *zone;
struct rcar_thermal_priv *priv;
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Could not get platform resource\n");
return -ENODEV;
priv = container_of(work, struct rcar_thermal_priv, work.work);
rcar_thermal_update_temp(priv);
rcar_thermal_irq_enable(priv);
thermal_zone_device_update(priv->zone);
}
static u32 rcar_thermal_had_changed(struct rcar_thermal_priv *priv, u32 status)
{
struct device *dev = rcar_priv_to_dev(priv);
status = (status >> rcar_id_to_shift(priv)) & 0x3;
if (status & 0x3) {
dev_dbg(dev, "thermal%d %s%s\n",
priv->id,
(status & 0x2) ? "Rising " : "",
(status & 0x1) ? "Falling" : "");
}
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(&pdev->dev, "Could not allocate priv\n");
return -ENOMEM;
return status;
}
static irqreturn_t rcar_thermal_irq(int irq, void *data)
{
struct rcar_thermal_common *common = data;
struct rcar_thermal_priv *priv;
unsigned long flags;
u32 status, mask;
spin_lock_irqsave(&common->lock, flags);
mask = rcar_thermal_common_read(common, INTMSK);
status = rcar_thermal_common_read(common, STR);
rcar_thermal_common_write(common, STR, 0x000F0F0F & mask);
spin_unlock_irqrestore(&common->lock, flags);
status = status & ~mask;
/*
* check the status
*/
rcar_thermal_for_each_priv(priv, common) {
if (rcar_thermal_had_changed(priv, status)) {
rcar_thermal_irq_disable(priv);
schedule_delayed_work(&priv->work,
msecs_to_jiffies(300));
}
}
priv->comp = 4; /* basic setup */
priv->dev = &pdev->dev;
spin_lock_init(&priv->lock);
priv->base = devm_ioremap_nocache(&pdev->dev,
res->start, resource_size(res));
if (!priv->base) {
dev_err(&pdev->dev, "Unable to ioremap thermal register\n");
return IRQ_HANDLED;
}
/*
* platform functions
*/
static int rcar_thermal_probe(struct platform_device *pdev)
{
struct rcar_thermal_common *common;
struct rcar_thermal_priv *priv;
struct device *dev = &pdev->dev;
struct resource *res, *irq;
int mres = 0;
int i;
int idle = IDLE_INTERVAL;
common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
if (!common) {
dev_err(dev, "Could not allocate common\n");
return -ENOMEM;
}
zone = thermal_zone_device_register("rcar_thermal", 0, 0, priv,
&rcar_thermal_zone_ops, NULL, 0, 0);
if (IS_ERR(zone)) {
dev_err(&pdev->dev, "thermal zone device is NULL\n");
return PTR_ERR(zone);
INIT_LIST_HEAD(&common->head);
spin_lock_init(&common->lock);
common->dev = dev;
irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (irq) {
int ret;
/*
* platform has IRQ support.
* Then, drier use common register
*/
res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
if (!res) {
dev_err(dev, "Could not get platform resource\n");
return -ENODEV;
}
ret = devm_request_irq(dev, irq->start, rcar_thermal_irq, 0,
dev_name(dev), common);
if (ret) {
dev_err(dev, "irq request failed\n ");
return ret;
}
/*
* rcar_has_irq_support() will be enabled
*/
common->base = devm_request_and_ioremap(dev, res);
if (!common->base) {
dev_err(dev, "Unable to ioremap thermal register\n");
return -ENOMEM;
}
/* enable temperature comparation */
rcar_thermal_common_write(common, ENR, 0x00030303);
idle = 0; /* polling delaye is not needed */
}
platform_set_drvdata(pdev, zone);
for (i = 0;; i++) {
res = platform_get_resource(pdev, IORESOURCE_MEM, mres++);
if (!res)
break;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(dev, "Could not allocate priv\n");
return -ENOMEM;
}
priv->base = devm_request_and_ioremap(dev, res);
if (!priv->base) {
dev_err(dev, "Unable to ioremap priv register\n");
return -ENOMEM;
}
dev_info(&pdev->dev, "proved\n");
priv->common = common;
priv->id = i;
mutex_init(&priv->lock);
INIT_LIST_HEAD(&priv->list);
INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
rcar_thermal_update_temp(priv);
priv->zone = thermal_zone_device_register("rcar_thermal",
1, 0, priv,
&rcar_thermal_zone_ops, NULL, 0,
idle);
if (IS_ERR(priv->zone)) {
dev_err(dev, "can't register thermal zone\n");
goto error_unregister;
}
list_move_tail(&priv->list, &common->head);
if (rcar_has_irq_support(priv))
rcar_thermal_irq_enable(priv);
}
platform_set_drvdata(pdev, common);
dev_info(dev, "%d sensor proved\n", i);
return 0;
error_unregister:
rcar_thermal_for_each_priv(priv, common)
thermal_zone_device_unregister(priv->zone);
return -ENODEV;
}
static int rcar_thermal_remove(struct platform_device *pdev)
{
struct thermal_zone_device *zone = platform_get_drvdata(pdev);
struct rcar_thermal_common *common = platform_get_drvdata(pdev);
struct rcar_thermal_priv *priv;
rcar_thermal_for_each_priv(priv, common)
thermal_zone_device_unregister(priv->zone);
thermal_zone_device_unregister(zone);
platform_set_drvdata(pdev, NULL);
return 0;
}
static const struct of_device_id rcar_thermal_dt_ids[] = {
{ .compatible = "renesas,rcar-thermal", },
{},
};
MODULE_DEVICE_TABLE(of, rcar_thermal_dt_ids);
static struct platform_driver rcar_thermal_driver = {
.driver = {
.name = "rcar_thermal",
.of_match_table = rcar_thermal_dt_ids,
},
.probe = rcar_thermal_probe,
.remove = rcar_thermal_remove,
......
drivers/thermal/spear_thermal.c
View file @ 2af78448
......@@ -131,7 +131,7 @@ static int spear_thermal_probe(struct platform_device *pdev)
return -ENOMEM;
}
stdev->clk = clk_get(&pdev->dev, NULL);
stdev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(stdev->clk)) {
dev_err(&pdev->dev, "Can't get clock\n");
return PTR_ERR(stdev->clk);
......@@ -140,7 +140,7 @@ static int spear_thermal_probe(struct platform_device *pdev)
ret = clk_enable(stdev->clk);
if (ret) {
dev_err(&pdev->dev, "Can't enable clock\n");
goto put_clk;
return ret;
}
stdev->flags = val;
......@@ -163,8 +163,6 @@ static int spear_thermal_probe(struct platform_device *pdev)
disable_clk:
clk_disable(stdev->clk);
put_clk:
clk_put(stdev->clk);
return ret;
}
......@@ -183,7 +181,6 @@ static int spear_thermal_exit(struct platform_device *pdev)
writel_relaxed(actual_mask & ~stdev->flags, stdev->thermal_base);
clk_disable(stdev->clk);
clk_put(stdev->clk);
return 0;
}
......
drivers/thermal/step_wise.c
View file @ 2af78448
......@@ -35,21 +35,54 @@
* state for this trip point
* b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
* state for this trip point
* c. if the trend is THERMAL_TREND_RAISE_FULL, use upper limit
* for this trip point
* d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit
* for this trip point
* If the temperature is lower than a trip point,
* a. if the trend is THERMAL_TREND_RAISING, do nothing
* b. if the trend is THERMAL_TREND_DROPPING, use lower cooling
* state for this trip point, if the cooling state already
* equals lower limit, deactivate the thermal instance
* c. if the trend is THERMAL_TREND_RAISE_FULL, do nothing
* d. if the trend is THERMAL_TREND_DROP_FULL, use lower limit,
* if the cooling state already equals lower limit,
* deactive the thermal instance
*/
static unsigned long get_target_state(struct thermal_instance *instance,
enum thermal_trend trend)
enum thermal_trend trend, bool throttle)
{
struct thermal_cooling_device *cdev = instance->cdev;
unsigned long cur_state;
cdev->ops->get_cur_state(cdev, &cur_state);
if (trend == THERMAL_TREND_RAISING) {
cur_state = cur_state < instance->upper ?
(cur_state + 1) : instance->upper;
} else if (trend == THERMAL_TREND_DROPPING) {
cur_state = cur_state > instance->lower ?
(cur_state - 1) : instance->lower;
switch (trend) {
case THERMAL_TREND_RAISING:
if (throttle)
cur_state = cur_state < instance->upper ?
(cur_state + 1) : instance->upper;
break;
case THERMAL_TREND_RAISE_FULL:
if (throttle)
cur_state = instance->upper;
break;
case THERMAL_TREND_DROPPING:
if (cur_state == instance->lower) {
if (!throttle)
cur_state = -1;
} else
cur_state -= 1;
break;
case THERMAL_TREND_DROP_FULL:
if (cur_state == instance->lower) {
if (!throttle)
cur_state = -1;
} else
cur_state = instance->lower;
break;
default:
break;
}
return cur_state;
......@@ -66,57 +99,14 @@ static void update_passive_instance(struct thermal_zone_device *tz,
tz->passive += value;
}
static void update_instance_for_throttle(struct thermal_zone_device *tz,
int trip, enum thermal_trip_type trip_type,
enum thermal_trend trend)
{
struct thermal_instance *instance;
list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
if (instance->trip != trip)
continue;
instance->target = get_target_state(instance, trend);
/* Activate a passive thermal instance */
if (instance->target == THERMAL_NO_TARGET)
update_passive_instance(tz, trip_type, 1);
instance->cdev->updated = false; /* cdev needs update */
}
}
static void update_instance_for_dethrottle(struct thermal_zone_device *tz,
int trip, enum thermal_trip_type trip_type)
{
struct thermal_instance *instance;
struct thermal_cooling_device *cdev;
unsigned long cur_state;
list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
if (instance->trip != trip ||
instance->target == THERMAL_NO_TARGET)
continue;
cdev = instance->cdev;
cdev->ops->get_cur_state(cdev, &cur_state);
instance->target = cur_state > instance->lower ?
(cur_state - 1) : THERMAL_NO_TARGET;
/* Deactivate a passive thermal instance */
if (instance->target == THERMAL_NO_TARGET)
update_passive_instance(tz, trip_type, -1);
cdev->updated = false; /* cdev needs update */
}
}
static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
{
long trip_temp;
enum thermal_trip_type trip_type;
enum thermal_trend trend;
struct thermal_instance *instance;
bool throttle = false;
int old_target;
if (trip == THERMAL_TRIPS_NONE) {
trip_temp = tz->forced_passive;
......@@ -128,12 +118,30 @@ static void thermal_zone_trip_update(struct thermal_zone_device *tz, int trip)
trend = get_tz_trend(tz, trip);
if (tz->temperature >= trip_temp)
throttle = true;
mutex_lock(&tz->lock);
if (tz->temperature >= trip_temp)
update_instance_for_throttle(tz, trip, trip_type, trend);
else
update_instance_for_dethrottle(tz, trip, trip_type);
list_for_each_entry(instance, &tz->thermal_instances, tz_node) {
if (instance->trip != trip)
continue;
old_target = instance->target;
instance->target = get_target_state(instance, trend, throttle);
/* Activate a passive thermal instance */
if (old_target == THERMAL_NO_TARGET &&
instance->target != THERMAL_NO_TARGET)
update_passive_instance(tz, trip_type, 1);
/* Deactivate a passive thermal instance */
else if (old_target != THERMAL_NO_TARGET &&
instance->target == THERMAL_NO_TARGET)
update_passive_instance(tz, trip_type, -1);
instance->cdev->updated = false; /* cdev needs update */
}
mutex_unlock(&tz->lock);
}
......
drivers/thermal/thermal_sys.c
View file @ 2af78448
......@@ -32,7 +32,6 @@
#include <linux/kdev_t.h>
#include <linux/idr.h>
#include <linux/thermal.h>
#include <linux/spinlock.h>
#include <linux/reboot.h>
#include <net/netlink.h>
#include <net/genetlink.h>
......@@ -348,8 +347,9 @@ static void handle_critical_trips(struct thermal_zone_device *tz,
tz->ops->notify(tz, trip, trip_type);
if (trip_type == THERMAL_TRIP_CRITICAL) {
pr_emerg("Critical temperature reached(%d C),shutting down\n",
tz->temperature / 1000);
dev_emerg(&tz->device,
"critical temperature reached(%d C),shutting down\n",
tz->temperature / 1000);
orderly_poweroff(true);
}
}
......@@ -371,23 +371,57 @@ static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
monitor_thermal_zone(tz);
}
static int thermal_zone_get_temp(struct thermal_zone_device *tz,
unsigned long *temp)
{
int ret = 0;
#ifdef CONFIG_THERMAL_EMULATION
int count;
unsigned long crit_temp = -1UL;
enum thermal_trip_type type;
#endif
mutex_lock(&tz->lock);
ret = tz->ops->get_temp(tz, temp);
#ifdef CONFIG_THERMAL_EMULATION
if (!tz->emul_temperature)
goto skip_emul;
for (count = 0; count < tz->trips; count++) {
ret = tz->ops->get_trip_type(tz, count, &type);
if (!ret && type == THERMAL_TRIP_CRITICAL) {
ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
break;
}
}
if (ret)
goto skip_emul;
if (*temp < crit_temp)
*temp = tz->emul_temperature;
skip_emul:
#endif
mutex_unlock(&tz->lock);
return ret;
}
static void update_temperature(struct thermal_zone_device *tz)
{
long temp;
int ret;
mutex_lock(&tz->lock);
ret = tz->ops->get_temp(tz, &temp);
ret = thermal_zone_get_temp(tz, &temp);
if (ret) {
pr_warn("failed to read out thermal zone %d\n", tz->id);
goto exit;
dev_warn(&tz->device, "failed to read out thermal zone %d\n",
tz->id);
return;
}
mutex_lock(&tz->lock);
tz->last_temperature = tz->temperature;
tz->temperature = temp;
exit:
mutex_unlock(&tz->lock);
}
......@@ -430,10 +464,7 @@ temp_show(struct device *dev, struct device_attribute *attr, char *buf)
long temperature;
int ret;
if (!tz->ops->get_temp)
return -EPERM;
ret = tz->ops->get_temp(tz, &temperature);
ret = thermal_zone_get_temp(tz, &temperature);
if (ret)
return ret;
......@@ -693,6 +724,31 @@ policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
return sprintf(buf, "%s\n", tz->governor->name);
}
#ifdef CONFIG_THERMAL_EMULATION
static ssize_t
emul_temp_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct thermal_zone_device *tz = to_thermal_zone(dev);
int ret = 0;
unsigned long temperature;
if (kstrtoul(buf, 10, &temperature))
return -EINVAL;
if (!tz->ops->set_emul_temp) {
mutex_lock(&tz->lock);
tz->emul_temperature = temperature;
mutex_unlock(&tz->lock);
} else {
ret = tz->ops->set_emul_temp(tz, temperature);
}
return ret ? ret : count;
}
static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
#endif/*CONFIG_THERMAL_EMULATION*/
static DEVICE_ATTR(type, 0444, type_show, NULL);
static DEVICE_ATTR(temp, 0444, temp_show, NULL);
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
......@@ -835,7 +891,7 @@ temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
temp_input);
struct thermal_zone_device *tz = temp->tz;
ret = tz->ops->get_temp(tz, &temperature);
ret = thermal_zone_get_temp(tz, &temperature);
if (ret)
return ret;
......@@ -1522,6 +1578,9 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
if (!ops || !ops->get_temp)
return ERR_PTR(-EINVAL);
if (trips > 0 && !ops->get_trip_type)
return ERR_PTR(-EINVAL);
tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
if (!tz)
return ERR_PTR(-ENOMEM);
......@@ -1585,6 +1644,11 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
goto unregister;
}
#ifdef CONFIG_THERMAL_EMULATION
result = device_create_file(&tz->device, &dev_attr_emul_temp);
if (result)
goto unregister;
#endif
/* Create policy attribute */
result = device_create_file(&tz->device, &dev_attr_policy);
if (result)
......@@ -1704,7 +1768,8 @@ static struct genl_multicast_group thermal_event_mcgrp = {
.name = THERMAL_GENL_MCAST_GROUP_NAME,
};
int thermal_generate_netlink_event(u32 orig, enum events event)
int thermal_generate_netlink_event(struct thermal_zone_device *tz,
enum events event)
{
struct sk_buff *skb;
struct nlattr *attr;
......@@ -1714,6 +1779,9 @@ int thermal_generate_netlink_event(u32 orig, enum events event)
int result;
static unsigned int thermal_event_seqnum;
if (!tz)
return -EINVAL;
/* allocate memory */
size = nla_total_size(sizeof(struct thermal_genl_event)) +
nla_total_size(0);
......@@ -1748,7 +1816,7 @@ int thermal_generate_netlink_event(u32 orig, enum events event)
memset(thermal_event, 0, sizeof(struct thermal_genl_event));
thermal_event->orig = orig;
thermal_event->orig = tz->id;
thermal_event->event = event;
/* send multicast genetlink message */
......@@ -1760,7 +1828,7 @@ int thermal_generate_netlink_event(u32 orig, enum events event)
result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
if (result)
pr_info("failed to send netlink event:%d\n", result);
dev_err(&tz->device, "Failed to send netlink event:%d", result);
return result;
}
......@@ -1800,6 +1868,7 @@ static int __init thermal_init(void)
idr_destroy(&thermal_cdev_idr);
mutex_destroy(&thermal_idr_lock);
mutex_destroy(&thermal_list_lock);
return result;
}
result = genetlink_init();
return result;
......
include/linux/platform_data/exynos_thermal.h
View file @ 2af78448
......@@ -53,6 +53,8 @@ struct freq_clip_table {
* struct exynos_tmu_platform_data
* @threshold: basic temperature for generating interrupt
* 25 <= threshold <= 125 [unit: degree Celsius]
* @threshold_falling: differntial value for setting threshold
* of temperature falling interrupt.
* @trigger_levels: array for each interrupt levels
* [unit: degree Celsius]
* 0: temperature for trigger_level0 interrupt
......@@ -97,6 +99,7 @@ struct freq_clip_table {
*/
struct exynos_tmu_platform_data {
u8 threshold;
u8 threshold_falling;
u8 trigger_levels[4];
bool trigger_level0_en;
bool trigger_level1_en;
......
include/linux/thermal.h
View file @ 2af78448
......@@ -74,6 +74,8 @@ enum thermal_trend {
THERMAL_TREND_STABLE, /* temperature is stable */
THERMAL_TREND_RAISING, /* temperature is raising */
THERMAL_TREND_DROPPING, /* temperature is dropping */
THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
};
/* Events supported by Thermal Netlink */
......@@ -121,6 +123,7 @@ struct thermal_zone_device_ops {
int (*set_trip_hyst) (struct thermal_zone_device *, int,
unsigned long);
int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
int (*set_emul_temp) (struct thermal_zone_device *, unsigned long);
int (*get_trend) (struct thermal_zone_device *, int,
enum thermal_trend *);
int (*notify) (struct thermal_zone_device *, int,
......@@ -163,6 +166,7 @@ struct thermal_zone_device {
int polling_delay;
int temperature;
int last_temperature;
int emul_temperature;
int passive;
unsigned int forced_passive;
const struct thermal_zone_device_ops *ops;
......@@ -244,9 +248,11 @@ int thermal_register_governor(struct thermal_governor *);
void thermal_unregister_governor(struct thermal_governor *);
#ifdef CONFIG_NET
extern int thermal_generate_netlink_event(u32 orig, enum events event);
extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
enum events event);
#else
static inline int thermal_generate_netlink_event(u32 orig, enum events event)
static int thermal_generate_netlink_event(struct thermal_zone_device *tz,
enum events event)
{
return 0;
}
......
kernel/time/tick-sched.c
View file @ 2af78448
......@@ -554,6 +554,7 @@ void tick_nohz_idle_enter(void)
local_irq_enable();
}
EXPORT_SYMBOL_GPL(tick_nohz_idle_enter);
/**
* tick_nohz_irq_exit - update next tick event from interrupt exit
......@@ -685,6 +686,7 @@ void tick_nohz_idle_exit(void)
local_irq_enable();
}
EXPORT_SYMBOL_GPL(tick_nohz_idle_exit);
static int tick_nohz_reprogram(struct tick_sched *ts, ktime_t now)
{
......
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