diff options
| author | Huacai Chen <chenhuacai@loongson.cn> | 2024-07-05 09:06:49 +0300 |
|---|---|---|
| committer | Viresh Kumar <viresh.kumar@linaro.org> | 2024-07-09 06:15:43 +0300 |
| commit | ccf51454145bffd98e31cdbe54a4262473c609e2 (patch) | |
| tree | c0490a3b616120418fd50825d9f8f841e77df50f /drivers/cpufreq/Makefile | |
| parent | b4b1ddc9dfe997a5f492fa3a36487f8e7a5de30d (diff) | |
| download | linux-ccf51454145bffd98e31cdbe54a4262473c609e2.tar.xz | |
cpufreq: Add Loongson-3 CPUFreq driver support
Some of LoongArch processors (Loongson-3 series) support DVFS, their
IOCSR.FEATURES has IOCSRF_FREQSCALE set. And they has a micro-core in
the package called SMC (System Management Controller), which can be
used to detect temperature, control fans, scale frequency and voltage,
etc.
The Loongson-3 CPUFreq driver is very simple now, it communicate with
SMC, get DVFS info, set target frequency from CPUFreq core, and so on.
There is a command list to interact with SMC, widely-used commands in
the CPUFreq driver include:
CMD_GET_VERSION: Get SMC firmware version.
CMD_GET_FEATURE: Get enabled SMC features.
CMD_SET_FEATURE: Enable SMC features, such as basic DVFS, BOOST.
CMD_GET_FREQ_LEVEL_NUM: Get the number of all frequency levels.
CMD_GET_FREQ_BOOST_LEVEL: Get the first boost frequency level.
CMD_GET_FREQ_LEVEL_INFO: Get the detail info of a frequency level.
CMD_GET_FREQ_INFO: Get the current frequency.
CMD_SET_FREQ_INFO: Set the target frequency.
In future we will add automatic frequency scaling, which is similar to
Intel's HWP (HardWare P-State).
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
[ Viresh: Minor formatting cleanups, change return type of exit() to
void and use devm_mutex_init() ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Diffstat (limited to 'drivers/cpufreq/Makefile')
| -rw-r--r-- | drivers/cpufreq/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile index 8d141c71b016..0f184031dd12 100644 --- a/drivers/cpufreq/Makefile +++ b/drivers/cpufreq/Makefile @@ -103,6 +103,7 @@ obj-$(CONFIG_POWERNV_CPUFREQ) += powernv-cpufreq.o # Other platform drivers obj-$(CONFIG_BMIPS_CPUFREQ) += bmips-cpufreq.o obj-$(CONFIG_LOONGSON2_CPUFREQ) += loongson2_cpufreq.o +obj-$(CONFIG_LOONGSON3_CPUFREQ) += loongson3_cpufreq.o obj-$(CONFIG_SH_CPU_FREQ) += sh-cpufreq.o obj-$(CONFIG_SPARC_US2E_CPUFREQ) += sparc-us2e-cpufreq.o obj-$(CONFIG_SPARC_US3_CPUFREQ) += sparc-us3-cpufreq.o |