From patchwork Wed Jun 12 06:42:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huacai Chen X-Patchwork-Id: 803806 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A573F13BC05; Wed, 12 Jun 2024 06:42:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718174557; cv=none; b=KyH4gzljmhKrQFaR7EfpUXL6DZo+A8fodsN10ReLkFMAhSfbwHGFf7aYycT/Rh00rKESHjrw9tigx2a9pPMLSjO50aKpjzySigCLQLQjdWPodkf7xNOffwFOEcS5uaD2VIeQKWaS1LEG+9C5imO05fCTKOyblqK0LoCHCMKjrT4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718174557; c=relaxed/simple; bh=XVpNvv7dutfr0NAL/LUAO2hwYx4PCPDqIKIqQ42xaXM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=cyL03mMu56dUwHt3vGwFiXlXREo/ZFuE4nCpfWXqkLPHVRqQ4JVFTPTX3EPzHnukdEtz6bG3BOOZ9dPITUmEPDc6slBH/Pns+v24N5zTmZ7q4loxkRbaFOwJNpSGwCd3ARsbKUXsYdpeQ9mKmfPrV6dqKzLOlEEsauV1bfYR024= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id D8747C32786; Wed, 12 Jun 2024 06:42:34 +0000 (UTC) From: Huacai Chen To: "Rafael J . Wysocki" , Viresh Kumar , Huacai Chen Cc: loongarch@lists.linux.dev, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Xuerui Wang , Jiaxun Yang , Huacai Chen , Binbin Zhou Subject: [PATCH 1/2] LoongArch: Add architectural preparation for CPUFreq Date: Wed, 12 Jun 2024 14:42:04 +0800 Message-ID: <20240612064205.2041548-2-chenhuacai@loongson.cn> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240612064205.2041548-1-chenhuacai@loongson.cn> References: <20240612064205.2041548-1-chenhuacai@loongson.cn> Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 Signed-off-by: Huacai Chen --- 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