From patchwork Fri Feb 23 16:23:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudeep Holla X-Patchwork-Id: 129439 Delivered-To: patch@linaro.org Received: by 10.46.66.2 with SMTP id p2csp789534lja; Fri, 23 Feb 2018 08:24:40 -0800 (PST) X-Google-Smtp-Source: AH8x225peehVXAEPNOohe6FC3n4aN2YlabYv9ej1ltqIsAo24MwDuxHqNbehHzCe3n0Vs6InUglh X-Received: by 10.98.153.157 with SMTP id t29mr2310465pfk.201.1519403080330; Fri, 23 Feb 2018 08:24:40 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1519403080; cv=none; d=google.com; s=arc-20160816; b=jiW10ANBbDLPao7J/BO1lBnsOaR42a3c3BuCiapeGGSiwuoLHFBzsEIyuydjYSZ+4S 9dwC33TBFfZDeh+1+rEHzVMfhIlj32L55pN9AWkjgzoT5plhSvNjPOvndv1vNbjgT0lx SvWo2ZyTC1EXy42QfXcpMa1CPX9VDBGE2h0WeYSZIhNLYxAHDrD8ot4sVufHGPyrfGhf LMPQ821/AHjtirzk8yZYIIQ/WTzjD1wIDQldhqicTAP7Pyo4dwEvZ6P2rrO0eEZPP1wC 4RCEmp9o131CRHIrREylJlGoMtjoJM4CQiSaRsGi8UgYNk83h2DCqgTgwgbZFykeGkBH Flhw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=zxOP0WiWlvtJ/OIp+Rq6G/vshRCRASh4HZX8EJBR3Ek=; b=PaqFmuXoFCN8oO7hgbiJzxjfXzu+wh9Apu1FTcIh5SBXQFM0jo5VUPShpggmwB+a2W TlmZ17WyE+kOSMMGV9efEM08kCSTwVfHD+px+wnXTAmWJxK6vO2oFgySRxYflJSE0eOR YoMtF6GetBCvj4WQjOmT8swKR0vf68kt6sZBIaaauXFt2uJr02EAL+Ry9sQasG1D0v8X Qd0ZaYdNjmCoJFjwYLcK0EMOhcgZfRYEvBxU67OoPb9D2M5LdQFwY5uD2Cjv1Pj7wkL3 jV0NBaFaYWNOIzYNbhhDJq8dUw2HaJHJLfjl57vL/cDmGKpKioO4rHFDVznGjOdBkrJn aFXw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id c10si1679622pge.396.2018.02.23.08.24.40; Fri, 23 Feb 2018 08:24:40 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752018AbeBWQYf (ORCPT + 28 others); Fri, 23 Feb 2018 11:24:35 -0500 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:57366 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751899AbeBWQYc (ORCPT ); Fri, 23 Feb 2018 11:24:32 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6C29516A3; Fri, 23 Feb 2018 08:24:32 -0800 (PST) Received: from e107155-lin.cambridge.arm.com (unknown [10.1.210.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id E755C3F25C; Fri, 23 Feb 2018 08:24:30 -0800 (PST) From: Sudeep Holla To: ALKML , LKML , DTML Cc: Sudeep Holla , Alexey Klimov , Arnd Bergmann , Greg Kroah-Hartman , Kevin Hilman Subject: [PATCH v6 15/20] firmware: arm_scmi: add device power domain support using genpd Date: Fri, 23 Feb 2018 16:23:45 +0000 Message-Id: <1519403030-21189-16-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1519403030-21189-1-git-send-email-sudeep.holla@arm.com> References: <1519403030-21189-1-git-send-email-sudeep.holla@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch hooks up the support for device power domain provided by SCMI using the Linux generic power domain infrastructure. Cc: Kevin Hilman Reviewed-by: Ulf Hansson Signed-off-by: Sudeep Holla --- drivers/firmware/Kconfig | 13 +++ drivers/firmware/arm_scmi/Makefile | 1 + drivers/firmware/arm_scmi/scmi_pm_domain.c | 140 +++++++++++++++++++++++++++++ 3 files changed, 154 insertions(+) create mode 100644 drivers/firmware/arm_scmi/scmi_pm_domain.c -- 2.7.4 diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index 704961e0473a..6e83880046d7 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -40,6 +40,19 @@ config ARM_SCMI_PROTOCOL This protocol library provides interface for all the client drivers making use of the features offered by the SCMI. +config ARM_SCMI_POWER_DOMAIN + tristate "SCMI power domain driver" + depends on ARM_SCMI_PROTOCOL || (COMPILE_TEST && OF) + default y + select PM_GENERIC_DOMAINS if PM + help + This enables support for the SCMI power domains which can be + enabled or disabled via the SCP firmware + + This driver can also be built as a module. If so, the module + will be called scmi_pm_domain. Note this may needed early in boot + before rootfs may be available. + config ARM_SCPI_PROTOCOL tristate "ARM System Control and Power Interface (SCPI) Message Protocol" depends on ARM || ARM64 || COMPILE_TEST diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile index 3236890905b9..99e36c580fbc 100644 --- a/drivers/firmware/arm_scmi/Makefile +++ b/drivers/firmware/arm_scmi/Makefile @@ -2,3 +2,4 @@ obj-y = scmi-bus.o scmi-driver.o scmi-protocols.o scmi-bus-y = bus.o scmi-driver-y = driver.o scmi-protocols-y = base.o clock.o perf.o power.o sensors.o +obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o diff --git a/drivers/firmware/arm_scmi/scmi_pm_domain.c b/drivers/firmware/arm_scmi/scmi_pm_domain.c new file mode 100644 index 000000000000..c03c06d3840a --- /dev/null +++ b/drivers/firmware/arm_scmi/scmi_pm_domain.c @@ -0,0 +1,140 @@ +/* + * SCMI Generic power domain support. + * + * Copyright (C) 2017 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along + * with this program. If not, see . + */ + +#include +#include +#include +#include +#include + +struct scmi_pm_domain { + struct generic_pm_domain genpd; + const struct scmi_handle *handle; + const char *name; + u32 domain; +}; + +#define to_scmi_pd(gpd) container_of(gpd, struct scmi_pm_domain, genpd) + +static int scmi_pd_power(struct generic_pm_domain *domain, bool power_on) +{ + int ret; + u32 state, ret_state; + struct scmi_pm_domain *pd = to_scmi_pd(domain); + const struct scmi_power_ops *ops = pd->handle->power_ops; + + if (power_on) + state = SCMI_POWER_STATE_GENERIC_ON; + else + state = SCMI_POWER_STATE_GENERIC_OFF; + + ret = ops->state_set(pd->handle, pd->domain, state); + if (!ret) + ret = ops->state_get(pd->handle, pd->domain, &ret_state); + if (!ret && state != ret_state) + return -EIO; + + return ret; +} + +static int scmi_pd_power_on(struct generic_pm_domain *domain) +{ + return scmi_pd_power(domain, true); +} + +static int scmi_pd_power_off(struct generic_pm_domain *domain) +{ + return scmi_pd_power(domain, false); +} + +static int scmi_pm_domain_probe(struct scmi_device *sdev) +{ + int num_domains, i; + struct device *dev = &sdev->dev; + struct device_node *np = dev->of_node; + struct scmi_pm_domain *scmi_pd; + struct genpd_onecell_data *scmi_pd_data; + struct generic_pm_domain **domains; + const struct scmi_handle *handle = sdev->handle; + + if (!handle || !handle->power_ops) + return -ENODEV; + + num_domains = handle->power_ops->num_domains_get(handle); + if (num_domains < 0) { + dev_err(dev, "number of domains not found\n"); + return num_domains; + } + + scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL); + if (!scmi_pd) + return -ENOMEM; + + scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL); + if (!scmi_pd_data) + return -ENOMEM; + + domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL); + if (!domains) + return -ENOMEM; + + for (i = 0; i < num_domains; i++, scmi_pd++) { + u32 state; + + domains[i] = &scmi_pd->genpd; + + scmi_pd->domain = i; + scmi_pd->handle = handle; + scmi_pd->name = handle->power_ops->name_get(handle, i); + scmi_pd->genpd.name = scmi_pd->name; + scmi_pd->genpd.power_off = scmi_pd_power_off; + scmi_pd->genpd.power_on = scmi_pd_power_on; + + if (handle->power_ops->state_get(handle, i, &state)) { + dev_warn(dev, "failed to get state for domain %d\n", i); + continue; + } + + pm_genpd_init(&scmi_pd->genpd, NULL, + state == SCMI_POWER_STATE_GENERIC_OFF); + } + + scmi_pd_data->domains = domains; + scmi_pd_data->num_domains = num_domains; + + of_genpd_add_provider_onecell(np, scmi_pd_data); + + return 0; +} + +static const struct scmi_device_id scmi_id_table[] = { + { SCMI_PROTOCOL_POWER }, + { }, +}; +MODULE_DEVICE_TABLE(scmi, scmi_id_table); + +static struct scmi_driver scmi_power_domain_driver = { + .name = "scmi-power-domain", + .probe = scmi_pm_domain_probe, + .id_table = scmi_id_table, +}; +module_scmi_driver(scmi_power_domain_driver); + +MODULE_AUTHOR("Sudeep Holla "); +MODULE_DESCRIPTION("ARM SCMI power domain driver"); +MODULE_LICENSE("GPL v2");