Commit f60d251b authored by Huacai Chen's avatar Huacai Chen
Browse files

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: default avatarBinbin Zhou <zhoubinbin@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 8e02c3b7

arch/loongarch/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -702,6 +702,7 @@ config ARCH_HIBERNATION_POSSIBLE 


source "kernel/power/Kconfig"

source "drivers/acpi/Kconfig"

source "drivers/cpufreq/Kconfig"



endmenu

arch/loongarch/include/asm/loongarch.h

+3 −0
Original line number Diff line number Diff line
@@ -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

arch/loongarch/power/platform.c

+15 −0
Original line number Diff line number Diff line
@@ -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