diff options
23 files changed, 2337 insertions, 269 deletions
diff --git a/Documentation/devicetree/bindings/thermal/dove-thermal.txt b/Documentation/devicetree/bindings/thermal/dove-thermal.txt new file mode 100644 index 0000000..6f47467 --- /dev/null +++ b/Documentation/devicetree/bindings/thermal/dove-thermal.txt @@ -0,0 +1,18 @@ +* 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>; + }; diff --git a/Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt b/Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt new file mode 100644 index 0000000..8c0f5eb --- /dev/null +++ b/Documentation/devicetree/bindings/thermal/kirkwood-thermal.txt @@ -0,0 +1,15 @@ +* 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>; + }; diff --git a/Documentation/devicetree/bindings/thermal/rcar-thermal.txt b/Documentation/devicetree/bindings/thermal/rcar-thermal.txt new file mode 100644 index 0000000..28ef498 --- /dev/null +++ b/Documentation/devicetree/bindings/thermal/rcar-thermal.txt @@ -0,0 +1,29 @@ +* 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>; +}; diff --git a/Documentation/thermal/exynos_thermal_emulation b/Documentation/thermal/exynos_thermal_emulation new file mode 100644 index 0000000..b73bbfb --- /dev/null +++ b/Documentation/thermal/exynos_thermal_emulation @@ -0,0 +1,53 @@ +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 diff --git a/Documentation/thermal/intel_powerclamp.txt b/Documentation/thermal/intel_powerclamp.txt new file mode 100644 index 0000000..332de4a --- /dev/null +++ b/Documentation/thermal/intel_powerclamp.txt @@ -0,0 +1,307 @@ + ======================= + 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). diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt index 88c0233..6859661 100644 --- a/Documentation/thermal/sysfs-api.txt +++ b/Documentation/thermal/sysfs-api.txt @@ -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. diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c index f84f5c5..6030805 100644 --- a/arch/x86/kernel/nmi.c +++ b/arch/x86/kernel/nmi.c @@ -509,3 +509,4 @@ void local_touch_nmi(void) { __this_cpu_write(last_nmi_rip, 0); } +EXPORT_SYMBOL_GPL(local_touch_nmi); diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index c2c77d1..a764f16 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -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 diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index d8da683..d3a2b38c 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -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 + diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c index c33fa53..8dc44cb 100644 --- a/drivers/thermal/cpu_cooling.c +++ b/drivers/thermal/cpu_cooling.c @@ -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) { diff --git a/drivers/thermal/db8500_cpufreq_cooling.c b/drivers/thermal/db8500_cpufreq_cooling.c index 4cf8e72..2141985 100644 --- a/drivers/thermal/db8500_cpufreq_cooling.c +++ b/drivers/thermal/db8500_cpufreq_cooling.c @@ -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, diff --git a/drivers/thermal/db8500_thermal.c b/drivers/thermal/db8500_thermal.c index ec71ade..61ce60a 100644 --- a/drivers/thermal/db8500_thermal.c +++ b/drivers/thermal/db8500_thermal.c @@ -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, diff --git a/drivers/thermal/dove_thermal.c b/drivers/thermal/dove_thermal.c new file mode 100644 index 0000000..7b0bfa0 --- /dev/null +++ b/drivers/thermal/dove_thermal.c @@ -0,0 +1,209 @@ +/* + * 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"); diff --git a/drivers/thermal/exynos_thermal.c b/drivers/thermal/exynos_thermal.c index bada130..e04ebd8 100644 --- a/drivers/thermal/exynos_thermal.c +++ b/drivers/thermal/exynos_thermal.c @@ -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, diff --git a/drivers/thermal/intel_powerclamp.c b/drivers/thermal/intel_powerclamp.c new file mode 100644 index 0000000..ab3ed90 --- /dev/null +++ b/drivers/thermal/intel_powerclamp.c @@ -0,0 +1,794 @@ +/* + * 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, ¶m); + + 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 *)¤t_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"); diff --git a/drivers/thermal/kirkwood_thermal.c b/drivers/thermal/kirkwood_thermal.c new file mode 100644 index 0000000..65cb4f0 --- /dev/null +++ b/drivers/thermal/kirkwood_thermal.c @@ -0,0 +1,134 @@ +/* + * 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"); diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c index 90db951..28f0919 100644 --- a/drivers/thermal/rcar_thermal.c +++ b/drivers/thermal/rcar_thermal.c @@ -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, diff --git a/drivers/thermal/spear_thermal.c b/drivers/thermal/spear_thermal.c index 6b2d8b2..3c5ee56 100644 --- a/drivers/thermal/spear_thermal.c +++ b/drivers/thermal/spear_thermal.c @@ -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; } diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c index 0cd5e9f..407cde3 100644 --- a/drivers/thermal/step_wise.c +++ b/drivers/thermal/step_wise.c @@ -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); } diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 84e95f3..5b7863a 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -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; diff --git a/include/linux/platform_data/exynos_thermal.h b/include/linux/platform_data/exynos_thermal.h index a7bdb2f..da7e627 100644 --- a/include/linux/platform_data/exynos_thermal.h +++ b/include/linux/platform_data/exynos_thermal.h @@ -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; diff --git a/include/linux/thermal.h b/include/linux/thermal.h index fe82022..f0bd7f9 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -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; } diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 314b9ee..a19a399 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -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) { |
