From patchwork Wed Jun 12 06:42:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Huacai Chen X-Patchwork-Id: 804759 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 59E4B168C3A; Wed, 12 Jun 2024 06:42:59 +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=1718174579; cv=none; b=F0XkQWYrv+DVHuLOGtqdfcqeXjaT5iIrCCP9wtoablNDO5nb7o4R/N8d/sm9P/7sXYDb99aw3BmMUE9ou52VH8g+cRa6tZJMiT9fJ4qZ9PrtiAdbDV4n74VaCZJjld8kDc587VUQx1Nh3oXDvzmE0oYLez3qp4q3kfUZCiq0ClA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718174579; c=relaxed/simple; bh=DngXwIwOml7WciO/yU4sdKptldcDsmCWDv9WXKcbVXU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=a4GwlN3I0o3aD+sP/mEXbE5SeKiJOu3gcnWc31JGHvXcIWp5GggWiL/v3tZa42kylgR8lmzCQ3j8xo8P2eA416u8Zkll+UKdglavdtxnAKPrHQ+y7q/C53nZ307QW00i3X7aY1Z/7KUXWLfofBrNX+VogkRTionevjLfCbNFGxc= 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 A0690C32786; Wed, 12 Jun 2024 06:42:56 +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 2/2] cpufreq: Add Loongson-3 CPUFreq driver support Date: Wed, 12 Jun 2024 14:42:05 +0800 Message-ID: <20240612064205.2041548-3-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 Some of LoongArch processors (Loongson-3 series) support DVFS, their IOCSR.FEATURES has IOCSRF_FREQSCALE set. And they has a micro-core in the package called SMC (System Management Controller), which can be used to detect temperature, control fans, scale frequency and voltage, etc. The Loongson-3 CPUFreq driver is very simple now, it communicate with SMC, get DVFS info, set target frequency from CPUFreq core, and so on. There is a command list to interact with SMC, widely-used commands in the CPUFreq driver include: CMD_GET_VERSION: Get SMC firmware version. CMD_GET_FEATURE: Get enabled SMC features. CMD_SET_FEATURE: Enable SMC features, such as basic DVFS, BOOST. CMD_GET_FREQ_LEVEL_NUM: Get the number of normal frequency levels. CMD_GET_FREQ_BOOST_NUM: Get the number of boost frequency levels. CMD_GET_FREQ_LEVEL_INFO: Get the detail info of a frequency level. CMD_GET_FREQ_INFO: Get the current frequency. CMD_SET_FREQ_INFO: Set the target frequency. In future we will add automatic frequency scaling, which is similar to Intel's HWP (HardWare P-State). Signed-off-by: Binbin Zhou Signed-off-by: Huacai Chen --- drivers/cpufreq/Kconfig | 12 + drivers/cpufreq/Makefile | 1 + drivers/cpufreq/loongson3_cpufreq.c | 442 ++++++++++++++++++++++++++++ 3 files changed, 455 insertions(+) create mode 100644 drivers/cpufreq/loongson3_cpufreq.c diff --git a/MAINTAINERS b/MAINTAINERS index aacccb376c28..f2e47ec28d77 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12968,6 +12968,7 @@ F: Documentation/arch/loongarch/ F: Documentation/translations/zh_CN/arch/loongarch/ F: arch/loongarch/ F: drivers/*/*loongarch* +F: drivers/cpufreq/loongson3_cpufreq.c LOONGSON GPIO DRIVER M: Yinbo Zhu diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig index 94e55c40970a..10cda6f2fe1d 100644 --- a/drivers/cpufreq/Kconfig +++ b/drivers/cpufreq/Kconfig @@ -262,6 +262,18 @@ config LOONGSON2_CPUFREQ If in doubt, say N. endif +if LOONGARCH +config LOONGSON3_CPUFREQ + tristate "Loongson3 CPUFreq Driver" + help + This option adds a CPUFreq driver for Loongson processors which + support software configurable cpu frequency. + + Loongson-3 family processors support this feature. + + If in doubt, say N. +endif + if SPARC64 config SPARC_US3_CPUFREQ tristate "UltraSPARC-III CPU Frequency driver" diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile index 8d141c71b016..0f184031dd12 100644 --- a/drivers/cpufreq/Makefile +++ b/drivers/cpufreq/Makefile @@ -103,6 +103,7 @@ obj-$(CONFIG_POWERNV_CPUFREQ) += powernv-cpufreq.o # Other platform drivers obj-$(CONFIG_BMIPS_CPUFREQ) += bmips-cpufreq.o obj-$(CONFIG_LOONGSON2_CPUFREQ) += loongson2_cpufreq.o +obj-$(CONFIG_LOONGSON3_CPUFREQ) += loongson3_cpufreq.o obj-$(CONFIG_SH_CPU_FREQ) += sh-cpufreq.o obj-$(CONFIG_SPARC_US2E_CPUFREQ) += sparc-us2e-cpufreq.o obj-$(CONFIG_SPARC_US3_CPUFREQ) += sparc-us3-cpufreq.o diff --git a/drivers/cpufreq/loongson3_cpufreq.c b/drivers/cpufreq/loongson3_cpufreq.c new file mode 100644 index 000000000000..5dbac0d55a32 --- /dev/null +++ b/drivers/cpufreq/loongson3_cpufreq.c @@ -0,0 +1,442 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * CPUFreq driver for the loongson-3 processors + * + * All revisions of Loongson-3 processor support this feature. + * + * Author: Huacai Chen + * Copyright (C) 2020-2024 Loongson Technology Corporation Limited + */ +#include +#include +#include +#include +#include + +#include +#include +#include + +/* Message */ +union smc_message { + u32 value; + struct { + u32 id : 4; + u32 info : 4; + u32 val : 16; + u32 cmd : 6; + u32 extra : 1; + u32 complete : 1; + }; +}; + +/* Command return values */ +#define CMD_OK 0 /* No error */ +#define CMD_ERROR 1 /* Regular error */ +#define CMD_NOCMD 2 /* Command does not support */ +#define CMD_INVAL 3 /* Invalid Parameter */ + +/* Version commands */ +/* + * CMD_GET_VERSION - Get interface version + * Input: none + * Output: version + */ +#define CMD_GET_VERSION 0x1 + +/* Feature commands */ +/* + * CMD_GET_FEATURE - Get feature state + * Input: feature ID + * Output: feature flag + */ +#define CMD_GET_FEATURE 0x2 + +/* + * CMD_SET_FEATURE - Set feature state + * Input: feature ID, feature flag + * output: none + */ +#define CMD_SET_FEATURE 0x3 + +/* Feature IDs */ +#define FEATURE_SENSOR 0 +#define FEATURE_FAN 1 +#define FEATURE_DVFS 2 + +/* Sensor feature flags */ +#define FEATURE_SENSOR_ENABLE BIT(0) +#define FEATURE_SENSOR_SAMPLE BIT(1) + +/* Fan feature flags */ +#define FEATURE_FAN_ENABLE BIT(0) +#define FEATURE_FAN_AUTO BIT(1) + +/* DVFS feature flags */ +#define FEATURE_DVFS_ENABLE BIT(0) +#define FEATURE_DVFS_BOOST BIT(1) +#define FEATURE_DVFS_AUTO BIT(2) +#define FEATURE_DVFS_SINGLE_BOOST BIT(3) + +/* Sensor commands */ +/* + * CMD_GET_SENSOR_NUM - Get number of sensors + * Input: none + * Output: number + */ +#define CMD_GET_SENSOR_NUM 0x4 + +/* + * CMD_GET_SENSOR_STATUS - Get sensor status + * Input: sensor ID, type + * Output: sensor status + */ +#define CMD_GET_SENSOR_STATUS 0x5 + +/* Sensor types */ +#define SENSOR_INFO_TYPE 0 +#define SENSOR_INFO_TYPE_TEMP 1 + +/* Fan commands */ +/* + * CMD_GET_FAN_NUM - Get number of fans + * Input: none + * Output: number + */ +#define CMD_GET_FAN_NUM 0x6 + +/* + * CMD_GET_FAN_INFO - Get fan status + * Input: fan ID, type + * Output: fan info + */ +#define CMD_GET_FAN_INFO 0x7 + +/* + * CMD_SET_FAN_INFO - Set fan status + * Input: fan ID, type, value + * Output: none + */ +#define CMD_SET_FAN_INFO 0x8 + +/* Fan types */ +#define FAN_INFO_TYPE_LEVEL 0 + +/* DVFS commands */ +/* + * CMD_GET_FREQ_LEVEL_NUM - Get number of freq levels + * Input: CPU ID + * Output: number + */ +#define CMD_GET_FREQ_LEVEL_NUM 0x9 + +/* + * CMD_GET_FREQ_BOOST_LEVEL - Get number of boost levels + * Input: CPU ID + * Output: number + */ +#define CMD_GET_FREQ_BOOST_LEVEL 0x10 + +/* + * CMD_GET_FREQ_LEVEL_INFO - Get freq level info + * Input: CPU ID, level ID + * Output: level info + */ +#define CMD_GET_FREQ_LEVEL_INFO 0x11 + +/* + * CMD_GET_FREQ_INFO - Get freq info + * Input: CPU ID, type + * Output: freq info + */ +#define CMD_GET_FREQ_INFO 0x12 + +/* + * CMD_SET_FREQ_INFO - Set freq info + * Input: CPU ID, type, value + * Output: none + */ +#define CMD_SET_FREQ_INFO 0x13 + +/* Freq types */ +#define FREQ_INFO_TYPE_FREQ 0 +#define FREQ_INFO_TYPE_LEVEL 1 + +#define FREQ_MAX_LEVEL (16 + 1) + +enum freq { + FREQ_LEV0, /* Reserved */ + FREQ_LEV1, FREQ_LEV2, FREQ_LEV3, FREQ_LEV4, + FREQ_LEV5, FREQ_LEV6, FREQ_LEV7, FREQ_LEV8, + FREQ_LEV9, FREQ_LEV10, FREQ_LEV11, FREQ_LEV12, + FREQ_LEV13, FREQ_LEV14, FREQ_LEV15, FREQ_LEV16, + FREQ_RESV +}; + +struct loongson3_freq_data { + unsigned int cur_cpu_freq; + struct cpufreq_frequency_table table[]; +}; + +static struct mutex cpufreq_mutex[MAX_PACKAGES]; +static struct cpufreq_driver loongson3_cpufreq_driver; +static DEFINE_PER_CPU(struct loongson3_freq_data *, freq_data); + +static inline int do_service_request(union smc_message *msg) +{ + int retries; + union smc_message last; + + last.value = iocsr_read32(LOONGARCH_IOCSR_SMCMBX); + if (!last.complete) + return -EPERM; + + iocsr_write32(msg->value, LOONGARCH_IOCSR_SMCMBX); + iocsr_write32(iocsr_read32(LOONGARCH_IOCSR_MISC_FUNC) | IOCSR_MISC_FUNC_SOFT_INT, + LOONGARCH_IOCSR_MISC_FUNC); + + for (retries = 0; retries < 10000; retries++) { + msg->value = iocsr_read32(LOONGARCH_IOCSR_SMCMBX); + if (msg->complete) + break; + + usleep_range(8, 12); + } + + if (!msg->complete || msg->cmd != CMD_OK) + return -EPERM; + + return 0; +} + +static unsigned int loongson3_cpufreq_get(unsigned int cpu) +{ + union smc_message msg; + + msg.id = cpu; + msg.info = FREQ_INFO_TYPE_FREQ; + msg.cmd = CMD_GET_FREQ_INFO; + msg.extra = 0; + msg.complete = 0; + do_service_request(&msg); + + per_cpu(freq_data, cpu)->cur_cpu_freq = msg.val * KILO; + + return per_cpu(freq_data, cpu)->cur_cpu_freq; +} + +static int loongson3_cpufreq_set(struct cpufreq_policy *policy, int freq_level) +{ + union smc_message msg; + + msg.id = cpu_data[policy->cpu].core; + msg.info = FREQ_INFO_TYPE_LEVEL; + msg.val = freq_level; + msg.cmd = CMD_SET_FREQ_INFO; + msg.extra = 0; + msg.complete = 0; + do_service_request(&msg); + + return 0; +} + +/* + * Here we notify other drivers of the proposed change and the final change. + */ +static int loongson3_cpufreq_target(struct cpufreq_policy *policy, unsigned int index) +{ + unsigned int cpu = policy->cpu; + unsigned int package = cpu_data[cpu].package; + + if (!cpu_online(cpu)) + return -ENODEV; + + /* setting the cpu frequency */ + mutex_lock(&cpufreq_mutex[package]); + loongson3_cpufreq_set(policy, index); + mutex_unlock(&cpufreq_mutex[package]); + + return 0; +} + +static int loongson3_cpufreq_get_freq_table(int cpu) +{ + union smc_message msg; + int i, ret, boost_level, max_level, freq_level; + struct loongson3_freq_data *data; + + if (per_cpu(freq_data, cpu)) + return 0; + + msg.id = cpu; + msg.cmd = CMD_GET_FREQ_LEVEL_NUM; + msg.extra = 0; + msg.complete = 0; + ret = do_service_request(&msg); + if (ret < 0) + return ret; + max_level = msg.val; + + msg.id = cpu; + msg.cmd = CMD_GET_FREQ_BOOST_LEVEL; + msg.extra = 0; + msg.complete = 0; + ret = do_service_request(&msg); + if (ret < 0) + return ret; + boost_level = msg.val; + + freq_level = min(max_level, FREQ_MAX_LEVEL); + data = kzalloc(struct_size(data, table, freq_level + 1), GFP_KERNEL); + if (!data) + return -ENOMEM; + + for (i = 0; i < freq_level; i++) { + msg.id = cpu; + msg.info = FREQ_INFO_TYPE_FREQ; + msg.cmd = CMD_GET_FREQ_LEVEL_INFO; + msg.val = i; + msg.complete = 0; + + ret = do_service_request(&msg); + if (ret < 0) { + kfree(data); + return ret; + } + + data->table[i].frequency = msg.val * KILO; + data->table[i].driver_data = FREQ_LEV0 + i; + data->table[i].flags = (i >= boost_level) ? CPUFREQ_BOOST_FREQ : 0; + } + + data->table[freq_level].frequency = CPUFREQ_TABLE_END; + data->table[freq_level].driver_data = FREQ_RESV; + data->table[freq_level].flags = 0; + + per_cpu(freq_data, cpu) = data; + + return 0; +} + +static int loongson3_cpufreq_cpu_init(struct cpufreq_policy *policy) +{ + int ret; + + if (!cpu_online(policy->cpu)) + return -ENODEV; + + ret = loongson3_cpufreq_get_freq_table(policy->cpu); + if (ret < 0) + return ret; + + policy->cur = loongson3_cpufreq_get(policy->cpu); + policy->cpuinfo.transition_latency = 10000; + policy->freq_table = per_cpu(freq_data, policy->cpu)->table; + cpumask_copy(policy->cpus, topology_sibling_cpumask(policy->cpu)); + + if (policy_has_boost_freq(policy)) { + ret = cpufreq_enable_boost_support(); + if (ret < 0) { + pr_warn("cpufreq: Failed to enable boost: %d\n", ret); + return ret; + } + loongson3_cpufreq_driver.boost_enabled = true; + } + + return 0; +} + +static int loongson3_cpufreq_cpu_exit(struct cpufreq_policy *policy) +{ + return 0; +} + +static struct cpufreq_driver loongson3_cpufreq_driver = { + .name = "loongson3", + .flags = CPUFREQ_CONST_LOOPS, + .init = loongson3_cpufreq_cpu_init, + .exit = loongson3_cpufreq_cpu_exit, + .verify = cpufreq_generic_frequency_table_verify, + .target_index = loongson3_cpufreq_target, + .get = loongson3_cpufreq_get, + .attr = cpufreq_generic_attr, +}; + +static struct platform_device_id cpufreq_id_table[] = { + { "loongson3_cpufreq", }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(platform, cpufreq_id_table); + +static struct platform_driver loongson3_platform_driver = { + .driver = { + .name = "loongson3_cpufreq", + }, + .id_table = cpufreq_id_table, +}; + +static int configure_cpufreq_info(void) +{ + int ret; + union smc_message msg; + + msg.cmd = CMD_GET_VERSION; + msg.extra = 0; + msg.complete = 0; + ret = do_service_request(&msg); + if (ret < 0 || msg.val < 0x1) + return -EPERM; + + msg.id = FEATURE_DVFS; + msg.cmd = CMD_SET_FEATURE; + msg.val = FEATURE_DVFS_ENABLE | FEATURE_DVFS_BOOST; + msg.extra = 0; + msg.complete = 0; + ret = do_service_request(&msg); + if (ret < 0) + return ret; + + return 0; +} + +static int __init cpufreq_init(void) +{ + int i, ret; + + ret = platform_driver_register(&loongson3_platform_driver); + if (ret) + return ret; + + ret = configure_cpufreq_info(); + if (ret) + goto err; + + for (i = 0; i < MAX_PACKAGES; i++) + mutex_init(&cpufreq_mutex[i]); + + ret = cpufreq_register_driver(&loongson3_cpufreq_driver); + if (ret) + goto err; + + pr_info("cpufreq: Loongson-3 CPU frequency driver.\n"); + + return 0; + +err: + platform_driver_unregister(&loongson3_platform_driver); + return ret; +} + +static void __exit cpufreq_exit(void) +{ + cpufreq_unregister_driver(&loongson3_cpufreq_driver); + platform_driver_unregister(&loongson3_platform_driver); +} + +module_init(cpufreq_init); +module_exit(cpufreq_exit); + +MODULE_AUTHOR("Huacai Chen "); +MODULE_DESCRIPTION("CPUFreq driver for Loongson-3 processors"); +MODULE_LICENSE("GPL");