From patchwork Fri Jun 7 19:43:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Hilman X-Patchwork-Id: 166190 Delivered-To: patch@linaro.org Received: by 2002:a92:9e1a:0:0:0:0:0 with SMTP id q26csp1054060ili; Fri, 7 Jun 2019 12:43:48 -0700 (PDT) X-Google-Smtp-Source: APXvYqzIvPc3i6mHwZfqUXlPlkIFDPNhL90/uSJu10cgCcC/LFr/RM+rfE6PpPz7PXU0RYMVrEgz X-Received: by 2002:a17:90a:65c2:: with SMTP id i2mr7367526pjs.54.1559936628676; Fri, 07 Jun 2019 12:43:48 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1559936628; cv=none; d=google.com; s=arc-20160816; b=LqdNHbNJJV7m+rkKKHYJcLdc3Tj7ZaOL0FSq4Qj5qziRhrEB0Ez9QOt/S455oyxBJa 26xvkQCdMEReT7AJRLgnIIOA8YXB9iP4vbqcKYGlKDDhX1bHgaSzKDvzKo17UlVV9VYU c+yyG+gidE9gtvhMFrFVMto/74tIYp1WzYuc1jab37ZF1edHKyWzZPiQu/19A7dMnnh/ R/AAMvYghtjKPBpI4PY9kkuRByhDW9vT6kxx4ZABXsN9wVBTkGPNVrjn7H6hs0N9fNQh GmnS4menzHZywQ2OFXjuEbn2BF0dQXElqV3qlGYRcw8PBXPiqGtO6tRG4HJD136GbMXs Vi5A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=NVUEYK09GjWk0LPENiRt4ObyUFhUkK1nfUviLkEfvuY=; b=xFxLzPsTZhZ2H/r2cnxPq5Job4lfc57UlKjchiD5S8kqueqPXXH2E/4zCkAUlZ09rc 49SsEH9jLE+oKmUeeqoDakA6D+jMaihVE7ta/LUm87PgntDpKsig9Zp3DMOxDpcWyVnd MLxXfFEh4FGbxkTmJ/vNvbdDuWkeXqNb3hck3kPsrAinJJCupnL2u7t/gnsg+I8VYuj0 uwn2gchDFx7r3CAcfobzoWF7pty7J0UWC3yTrx+AeHUWf48XEAUGeWNdMi8bRRNj6F+A 3xwDORqCvSYYAcwHv4QpJsirhQWYJFV1V9ckR9buXiwhLUNdvNN5VWp2L8TNyPa32mVc wZpw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=SKbOO26s; 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; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id q21si2671764pgi.357.2019.06.07.12.43.48; Fri, 07 Jun 2019 12:43:48 -0700 (PDT) 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; dkim=pass header.i=@kernel.org header.s=default header.b=SKbOO26s; 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; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731132AbfFGTnr (ORCPT + 30 others); Fri, 7 Jun 2019 15:43:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:52880 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729731AbfFGTnp (ORCPT ); Fri, 7 Jun 2019 15:43:45 -0400 Received: from localhost (c-71-197-186-152.hsd1.wa.comcast.net [71.197.186.152]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1B8D9208E3; Fri, 7 Jun 2019 19:43:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559936624; bh=GJ+QUPOmqyMWmUxURQkzA0pp+rSOKSz2pl7nJLh+RMU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SKbOO26sT5XEOapBMw/AuZoThvOSfFkw4w9M+A34WaTRQf2fVb96J4g2vDEXOAzak InAy+7qukY1NEhd03LB2wkKeFPQ5jcQYSZPjZQ17s6z0vjd+mmY8vkthUwH6LwXzos cmRifOzaftSYPLrS42G4d5K+vNt5ZDLsGZJD9V8g= From: Kevin Hilman To: linux-rtc@vger.kernel.org, Alexandre Belloni Cc: linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Neil Armstrong , Kevin Hilman Subject: [PATCH 2/2] rtc: Add Amlogic Virtual Wake RTC Date: Fri, 7 Jun 2019 12:43:43 -0700 Message-Id: <20190607194343.18359-2-khilman@kernel.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190607194343.18359-1-khilman@kernel.org> References: <20190607194343.18359-1-khilman@kernel.org> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Neil Armstrong The 64-bit Amlogic SoCs uses a special register to store the time in seconds to wakeup after a system suspend. In order to be able to reuse the RTC wakealarm feature, this driver implements a fake RTC device which uses the system time to deduce a suspend delay. Signed-off-by: Neil Armstrong [khilman: rebase to v5.2-rc, moved from do_gettimeofday()] Tested-by: Kevin Hilman Signed-off-by: Kevin Hilman --- Originally written/sumbmitted by Neil as part of a broader/suspend resume series[1] for the GXBB family. Newer SoCs support PSCI properly, so don't need the PSCI changes there, and this driver alone enables RTC wakeups from suspend. [1] https://lore.kernel.org/lkml/1478183365-23708-1-git-send-email-narmstrong@baylibre.com/ drivers/rtc/Kconfig | 11 +++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-meson-vrtc.c | 149 +++++++++++++++++++++++++++++++++++ 3 files changed, 161 insertions(+) create mode 100644 drivers/rtc/rtc-meson-vrtc.c -- 2.21.0 diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 5c0790eed656..78d2967d5ee3 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -373,6 +373,17 @@ config RTC_DRV_MAX77686 This driver can also be built as a module. If so, the module will be called rtc-max77686. +config RTC_DRV_MESON_VRTC + tristate "Amlogic Meson Virtual RTC" + depends on ARCH_MESON || COMPILE_TEST + default m if ARCH_MESON + help + If you say yes here you will get support for the + Virtual RTC of Amlogic SoCs. + + This driver can also be built as a module. If so, the module + will be called rtc-meson-vrtc. + config RTC_DRV_RK808 tristate "Rockchip RK805/RK808/RK818 RTC" depends on MFD_RK808 diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 9d997faa2c26..9485fb46b023 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -101,6 +101,7 @@ obj-$(CONFIG_RTC_DRV_MAX8907) += rtc-max8907.o obj-$(CONFIG_RTC_DRV_MAX8925) += rtc-max8925.o obj-$(CONFIG_RTC_DRV_MAX8997) += rtc-max8997.o obj-$(CONFIG_RTC_DRV_MAX8998) += rtc-max8998.o +obj-$(CONFIG_RTC_DRV_MESON_VRTC)+= rtc-meson-vrtc.o obj-$(CONFIG_RTC_DRV_MC13XXX) += rtc-mc13xxx.o obj-$(CONFIG_RTC_DRV_MCP795) += rtc-mcp795.o obj-$(CONFIG_RTC_DRV_MESON) += rtc-meson.o diff --git a/drivers/rtc/rtc-meson-vrtc.c b/drivers/rtc/rtc-meson-vrtc.c new file mode 100644 index 000000000000..f695f65ab199 --- /dev/null +++ b/drivers/rtc/rtc-meson-vrtc.c @@ -0,0 +1,149 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 BayLibre, SAS + * Author: Neil Armstrong + * Copyright (C) 2015 Amlogic, Inc. All rights reserved. + */ +#include +#include +#include +#include +#include +#include + +struct meson_vrtc_data { + struct platform_device *pdev; + void __iomem *io_alarm; + struct rtc_device *rtc; + unsigned long alarm_time; +}; + +static int meson_vrtc_read_time(struct device *dev, struct rtc_time *tm) +{ + unsigned long local_time; + struct timespec64 time; + + ktime_get_raw_ts64(&time); + local_time = time.tv_sec - (sys_tz.tz_minuteswest * 60); + rtc_time_to_tm(local_time, tm); + + return 0; +} + +static void meson_vrtc_set_wakeup_time(struct meson_vrtc_data *vrtc, + unsigned long time) +{ + writel_relaxed(time, vrtc->io_alarm); + + dev_dbg(&vrtc->pdev->dev, "set_wakeup_time: %lu\n", time); +} + +static int meson_vrtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct meson_vrtc_data *vrtc = dev_get_drvdata(dev); + struct timespec64 time; + unsigned long local_time; + unsigned long alarm_secs; + int ret; + + if (alarm->enabled) { + ret = rtc_tm_to_time(&alarm->time, &alarm_secs); + if (ret) + return ret; + + ktime_get_raw_ts64(&time); + local_time = time.tv_sec - (sys_tz.tz_minuteswest * 60); + + vrtc->alarm_time = alarm_secs; + + if (alarm_secs >= local_time) { + alarm_secs = alarm_secs - local_time; + + meson_vrtc_set_wakeup_time(vrtc, alarm_secs); + + pr_debug("system will wakeup %lus later\n", alarm_secs); + } + } else { + vrtc->alarm_time = 0; + meson_vrtc_set_wakeup_time(vrtc, 0); + } + + return 0; +} + +static int meson_vrtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) +{ + struct meson_vrtc_data *vrtc = dev_get_drvdata(dev); + + if (!vrtc->alarm_time) { + alm->enabled = true; + + rtc_time_to_tm(vrtc->alarm_time, &alm->time); + } + + return 0; +} + +static const struct rtc_class_ops meson_vrtc_ops = { + .read_time = meson_vrtc_read_time, + .set_alarm = meson_vrtc_set_alarm, + .read_alarm = meson_vrtc_read_alarm, +}; + +static int meson_vrtc_probe(struct platform_device *pdev) +{ + struct meson_vrtc_data *vrtc; + struct resource *res; + + vrtc = devm_kzalloc(&pdev->dev, sizeof(*vrtc), GFP_KERNEL); + if (!vrtc) + return -ENOMEM; + + vrtc->pdev = pdev; + + /* Alarm registers */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + vrtc->io_alarm = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(vrtc->io_alarm)) + return PTR_ERR(vrtc->io_alarm); + + device_init_wakeup(&pdev->dev, 1); + + platform_set_drvdata(pdev, vrtc); + + vrtc->rtc = devm_rtc_device_register(&pdev->dev, "meson-vrtc", + &meson_vrtc_ops, THIS_MODULE); + if (IS_ERR(vrtc->rtc)) + return PTR_ERR(vrtc->rtc); + + return 0; +} + +int meson_vrtc_resume(struct platform_device *pdev) +{ + struct meson_vrtc_data *vrtc = platform_get_drvdata(pdev); + + meson_vrtc_set_wakeup_time(vrtc, 0); + + return 0; +} + +static const struct of_device_id meson_vrtc_dt_match[] = { + { .compatible = "amlogic,meson-vrtc"}, + {}, +}; +MODULE_DEVICE_TABLE(of, meson_vrtc_dt_match); + +struct platform_driver meson_vrtc_driver = { + .driver = { + .name = "meson-vrtc", + .of_match_table = meson_vrtc_dt_match, + }, + .probe = meson_vrtc_probe, + .resume = meson_vrtc_resume, +}; + +module_platform_driver(meson_vrtc_driver); + +MODULE_DESCRIPTION("Amlogic Virtual Wakeup RTC Timer driver"); +MODULE_LICENSE("GPL");