linux-kernel - [PATCH 1/2] LoongArch: Add architectural preparation for CPUFreq

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Date: Wed, 12 Jun 2024 14:42:04 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: "Rafael J . Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Xuerui Wang <kernel@...0n.name>,
	Jiaxun Yang <jiaxun.yang@...goat.com>,
	Huacai Chen <chenhuacai@...ngson.cn>,
	Binbin Zhou <zhoubinbin@...ngson.cn>
Subject: [PATCH 1/2] 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@...ngson.cn>
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
 arch/loongarch/Kconfig                 |  1 +
 arch/loongarch/include/asm/loongarch.h |  3 +++
 arch/loongarch/power/platform.c        | 15 +++++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index e38139c576ee..dffa9c454123 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -696,6 +696,7 @@ 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 eb09adda54b7..7d89b2ecf2c2 100644
--- a/arch/loongarch/include/asm/loongarch.h
+++ b/arch/loongarch/include/asm/loongarch.h
@@ -1053,11 +1053,14 @@
 #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
-- 
2.43.0