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[V2,1/2] LoongArch: Add architectural preparation for CPUFreq

Message ID 20240702152737.1184244-2-chenhuacai@loongson.cn (mailing list archive)
State Handled Elsewhere, archived
Headers show
Series LoongArch: Add Loongson-3 CPUFreq driver support | expand

Commit Message

Huacai Chen July 2, 2024, 3:27 p.m. UTC 
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>
---
 arch/loongarch/Kconfig                 |  1 +
 arch/loongarch/include/asm/loongarch.h |  3 +++
 arch/loongarch/power/platform.c        | 15 +++++++++++++++
 3 files changed, 19 insertions(+)
diff mbox series

Patch

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index e346b5b0a5ca..692adf6aad7e 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -701,6 +701,7 @@  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 4b5d82643c23..0909729dc2e1 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 void default_suspend_addr(void)
 {
 	acpi_enter_sleep_state(ACPI_STATE_S3);