diff options
| author | Huacai Chen <chenhuacai@loongson.cn> | 2024-07-20 22:41:06 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2024-07-20 22:41:06 +0800 |
| commit | f60d251b27f6599b3407950924ac9b2c7a94b714 (patch) | |
| tree | b0211b7915b34153e1933974c88b06e5fbd94000 /arch/loongarch | |
| parent | 8e02c3b782ec64343f3cccc8dc5a8be2b379e80b (diff) | |
LoongArch: Add architectural preparation for CPUFreq
Add architectural preparation for CPUFreq driver, including: Kconfig,
register definition and platform device registration.
Some of LoongArch processors support DVFS, their IOCSR.FEATURES has
IOCSRF_FREQSCALE set. And they has a micro-core in the package called
SMC (System Management Controller) to scale frequency, voltage, etc.
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch')
| -rw-r--r-- | arch/loongarch/Kconfig | 1 | ||||
| -rw-r--r-- | arch/loongarch/include/asm/loongarch.h | 3 | ||||
| -rw-r--r-- | arch/loongarch/power/platform.c | 15 |
3 files changed, 19 insertions, 0 deletions
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 0693b621ebd4..9687b1d24126 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -702,6 +702,7 @@ config ARCH_HIBERNATION_POSSIBLE source "kernel/power/Kconfig" source "drivers/acpi/Kconfig" +source "drivers/cpufreq/Kconfig" endmenu diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h index c430df595376..1501f0f8b06e 100644 --- a/arch/loongarch/include/asm/loongarch.h +++ b/arch/loongarch/include/asm/loongarch.h @@ -1061,11 +1061,14 @@ #define LOONGARCH_IOCSR_NODECNT 0x408 #define LOONGARCH_IOCSR_MISC_FUNC 0x420 +#define IOCSR_MISC_FUNC_SOFT_INT BIT_ULL(10) #define IOCSR_MISC_FUNC_TIMER_RESET BIT_ULL(21) #define IOCSR_MISC_FUNC_EXT_IOI_EN BIT_ULL(48) #define LOONGARCH_IOCSR_CPUTEMP 0x428 +#define LOONGARCH_IOCSR_SMCMBX 0x51c + /* PerCore CSR, only accessible by local cores */ #define LOONGARCH_IOCSR_IPI_STATUS 0x1000 #define LOONGARCH_IOCSR_IPI_EN 0x1004 diff --git a/arch/loongarch/power/platform.c b/arch/loongarch/power/platform.c index 3ea8e07aa225..a19353f7d1b0 100644 --- a/arch/loongarch/power/platform.c +++ b/arch/loongarch/power/platform.c @@ -34,6 +34,21 @@ void enable_pci_wakeup(void) acpi_write_bit_register(ACPI_BITREG_PCIEXP_WAKE_DISABLE, 0); } +static struct platform_device loongson3_cpufreq_device = { + .name = "loongson3_cpufreq", + .id = -1, +}; + +static int __init loongson_cpufreq_init(void) +{ + if (!cpu_has_scalefreq) + return -ENODEV; + + return platform_device_register(&loongson3_cpufreq_device); +} + +arch_initcall(loongson_cpufreq_init); + static int __init loongson3_acpi_suspend_init(void) { #ifdef CONFIG_ACPI |