From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61BAAC4CECC for ; Mon, 27 Apr 2020 21:08:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A32F206BF for ; Mon, 27 Apr 2020 21:08:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726808AbgD0VIj (ORCPT ); Mon, 27 Apr 2020 17:08:39 -0400 Received: from foss.arm.com ([217.140.110.172]:42340 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726285AbgD0VIi (ORCPT ); Mon, 27 Apr 2020 17:08:38 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A2DA5C14; Mon, 27 Apr 2020 14:08:37 -0700 (PDT) Received: from e120937-lin.home (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9AEB53F305; Mon, 27 Apr 2020 14:08:36 -0700 (PDT) From: Cristian Marussi To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: sudeep.holla@arm.com, lukasz.luba@arm.com, james.quinlan@broadcom.com, Jonathan.Cameron@Huawei.com, cristian.marussi@arm.com Subject: [RFC PATCH 1/3] firmware: arm_scmi: Add System Power Protocol support Date: Mon, 27 Apr 2020 22:08:04 +0100 Message-Id: <20200427210806.37422-2-cristian.marussi@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200427210806.37422-1-cristian.marussi@arm.com> References: <20200427210806.37422-1-cristian.marussi@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add bare protocol support for SCMI SystemPower as needed by an OSPM agent: basic initialization and SYSTEM_POWER_STATE_NOTIFIER core notification support. No event-handling logic is attached to such notification by this commit. Signed-off-by: Cristian Marussi --- drivers/firmware/arm_scmi/Makefile | 2 +- drivers/firmware/arm_scmi/system.c | 146 +++++++++++++++++++++++++++++ include/linux/scmi_protocol.h | 17 ++++ 3 files changed, 164 insertions(+), 1 deletion(-) create mode 100644 drivers/firmware/arm_scmi/system.c diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile index d55612362d65..e01b67bc74b4 100644 --- a/drivers/firmware/arm_scmi/Makefile +++ b/drivers/firmware/arm_scmi/Makefile @@ -5,5 +5,5 @@ scmi-driver-y = driver.o notify.o scmi-transport-y = shmem.o scmi-transport-$(CONFIG_MAILBOX) += mailbox.o scmi-transport-$(CONFIG_HAVE_ARM_SMCCC) += smc.o -scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o +scmi-protocols-y = base.o clock.o perf.o power.o reset.o sensors.o system.o obj-$(CONFIG_ARM_SCMI_POWER_DOMAIN) += scmi_pm_domain.o diff --git a/drivers/firmware/arm_scmi/system.c b/drivers/firmware/arm_scmi/system.c new file mode 100644 index 000000000000..9b43d9a873f3 --- /dev/null +++ b/drivers/firmware/arm_scmi/system.c @@ -0,0 +1,146 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * System Control and Management Interface (SCMI) System Power Protocol + * + * Copyright (C) 2020 ARM Ltd. + */ + +#include "common.h" +#include "notify.h" + +#define SCMI_SYSTEM_NUM_SOURCES 1 + +enum scmi_system_protocol_cmd { + SYSTEM_POWER_STATE_NOTIFY = 0x5, +}; + +enum scmi_system_protocol_notify { + SYSTEM_POWER_STATE_NOTIFIER = 0x0, +}; + +struct scmi_system_power_state_notify { + __le32 notify_enable; +}; + +struct scmi_system_power_state_notifier_payld { + __le32 agent_id; + __le32 flags; + __le32 system_state; +}; + +struct scmi_system_info { + u32 version; +}; + +static int scmi_system_request_notify(const struct scmi_handle *handle, + bool enable) +{ + int ret; + struct scmi_xfer *t; + struct scmi_system_power_state_notify *notify; + + ret = scmi_xfer_get_init(handle, SYSTEM_POWER_STATE_NOTIFY, + SCMI_PROTOCOL_SYSTEM, sizeof(*notify), 0, &t); + if (ret) + return ret; + + notify = t->tx.buf; + notify->notify_enable = enable ? cpu_to_le32(BIT(0)) : 0; + + ret = scmi_do_xfer(handle, t); + + scmi_xfer_put(handle, t); + return ret; +} + +static bool scmi_system_set_notify_enabled(const struct scmi_handle *handle, + u8 evt_id, u32 src_id, bool enable) +{ + int ret; + + ret = scmi_system_request_notify(handle, enable); + if (ret) + pr_warn("SCMI Notifications - Proto:%X - FAIL_ENABLE - evt[%X] - ret:%d\n", + SCMI_PROTOCOL_SYSTEM, evt_id, ret); + + return !ret; +} + +static void *scmi_system_fill_custom_report(const struct scmi_handle *handle, + u8 evt_id, u64 timestamp, + const void *payld, size_t payld_sz, + void *report, u32 *src_id) +{ + void *rep = NULL; + + switch (evt_id) { + case SYSTEM_POWER_STATE_NOTIFIER: + { + const struct scmi_system_power_state_notifier_payld *p = payld; + struct scmi_system_power_state_notifier_report *r = report; + + if (sizeof(*p) != payld_sz) + break; + + r->timestamp = timestamp; + r->agent_id = le32_to_cpu(p->agent_id); + r->flags = le32_to_cpu(p->flags); + r->system_state = le32_to_cpu(p->system_state); + *src_id = 0; + rep = r; + break; + } + default: + break; + } + + return rep; +} + +static const struct scmi_event system_events[] = { + { + .id = SYSTEM_POWER_STATE_NOTIFIER, + .max_payld_sz = 12, + .max_report_sz = + sizeof(struct scmi_system_power_state_notifier_report), + }, +}; + +static const struct scmi_protocol_event_ops system_event_ops = { + .set_notify_enabled = scmi_system_set_notify_enabled, + .fill_custom_report = scmi_system_fill_custom_report, +}; + +static int scmi_system_protocol_init(struct scmi_handle *handle) +{ + u32 version; + struct scmi_system_info *pinfo; + + scmi_version_get(handle, SCMI_PROTOCOL_SYSTEM, &version); + + dev_dbg(handle->dev, "System Power Version %d.%d\n", + PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version)); + + pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL); + if (!pinfo) + return -ENOMEM; + + scmi_register_protocol_events(handle, + SCMI_PROTOCOL_SYSTEM, PAGE_SIZE, + &system_event_ops, + system_events, + ARRAY_SIZE(system_events), + SCMI_SYSTEM_NUM_SOURCES); + + pinfo->version = version; + handle->system_priv = pinfo; + + return 0; +} + +static int __init scmi_system_init(void) +{ + return scmi_protocol_register(SCMI_PROTOCOL_SYSTEM, + &scmi_system_protocol_init); +} +subsys_initcall(scmi_system_init); diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h index 1ee6f0502565..fc9f0105e6cc 100644 --- a/include/linux/scmi_protocol.h +++ b/include/linux/scmi_protocol.h @@ -295,6 +295,7 @@ struct scmi_handle { void *sensor_priv; void *reset_priv; void *notify_priv; + void *system_priv; }; enum scmi_std_protocol { @@ -307,6 +308,15 @@ enum scmi_std_protocol { SCMI_PROTOCOL_RESET = 0x16, }; +enum scmi_system_events { + SCMI_SYSTEM_SHUTDOWN, + SCMI_SYSTEM_COLDRESET, + SCMI_SYSTEM_WARMRESET, + SCMI_SYSTEM_POWERUP, + SCMI_SYSTEM_SUSPEND, + SCMI_SYSTEM_MAX +}; + struct scmi_device { u32 id; u8 protocol_id; @@ -388,6 +398,13 @@ struct scmi_power_state_change_requested_report { u32 power_state; }; +struct scmi_system_power_state_notifier_report { + u64 timestamp; + u32 agent_id; + u32 flags; + u32 system_state; +}; + struct scmi_perf_limits_report { u64 timestamp; u32 agent_id; -- 2.17.1