From patchwork Wed Oct 3 13:31:54 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Stanley X-Patchwork-Id: 978328 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 42QH7l6XrCz9s1x for ; Wed, 3 Oct 2018 23:34:59 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=jms.id.au Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="cMXx+YCQ"; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 42QH7l4s8SzF39y for ; Wed, 3 Oct 2018 23:34:59 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=jms.id.au Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="cMXx+YCQ"; dkim-atps=neutral X-Original-To: linux-aspeed@lists.ozlabs.org Delivered-To: linux-aspeed@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=gmail.com (client-ip=2a00:1450:4864:20::543; helo=mail-ed1-x543.google.com; envelope-from=joel.stan@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=jms.id.au Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="cMXx+YCQ"; dkim-atps=neutral Received: from mail-ed1-x543.google.com (mail-ed1-x543.google.com [IPv6:2a00:1450:4864:20::543]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 42QH4V58czzF38c for ; Wed, 3 Oct 2018 23:32:10 +1000 (AEST) Received: by mail-ed1-x543.google.com with SMTP id h4-v6so5344551edi.6 for ; Wed, 03 Oct 2018 06:32:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=JoZeYtyQ79MOQHmmKRs1FkK/Yz7O5KeZm4argFjAYY0=; b=cMXx+YCQZ5J5RqGjss7KIV7Py4RMpHo8B/X0K0UPsBHA0QKeBDc58pO46L4ItXXUmP e1GmyBq387km/a3396gVPScog0YtRoEukYIyu0P8f2xDuE9F4MAiw9gHIINlAZw66Xal RYktRokK+rI4TwfwKpDIUMVwbYY8Tjc2rSb/kJ5KanlA+fatgIX9ikuW5Jf3YWy0kL4/ jhjh5+PtOEyXbxtNW6K7dCL/3qPNeupQE4udWxEdo27DlFSaJvDvK5TK+kKDupiyjlNr X7rlwfybU/pV1eaCWn/IfDllHvfyu5rNxLSyzeW6EQ8V19ahDh82kFTz9fhpFxAMV6Tw Jd2A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references; bh=JoZeYtyQ79MOQHmmKRs1FkK/Yz7O5KeZm4argFjAYY0=; b=IcyKLjo9bSLgcLkPxKQyit8Byf6ABqN+qwqdMdrFpPxdx57G9XR8zdScfRdYw3Pz9S 7gkDUguhYbfuAfHnIrpskso8Eye0DWmEEJTL7j4QqvIO7YvBDfdpzcsCwjN9WZ1BPy4j LOI2VK5+s86FgW4t/QjEJUh8VtlbztBNaRxIrX1vCKdrG0WZGX3kYvEJUtXM16Wzj0ww fsqkTjREnm+Wc/607BWt8oDpTvyEIFAvovQdSHg7uDEhIt0plVZJDpWAsm6Ps/lLI7HW wutfPN3eJxA2mNmRn64W0e+44jEKOeNTcSYILFM7nSLekedCvdTAnLspDT9yVgyyhPtQ vl5w== X-Gm-Message-State: ABuFfojQ12lHyXpr7fVvjiQUUYyhgPwvY1mk8ktqQ8et4VeKrE4NJ7bY f3eA4vt7Z134h+KEtYeNKkBgpJUyvMA= X-Google-Smtp-Source: ACcGV63V6goTyGOW8r3VDw46a7sNXr7JUXo8ra5L06AeiZMJ+F5MqZsRIX1qnzyY1shYmpbM1ekLeg== X-Received: by 2002:a17:906:c28f:: with SMTP id r15-v6mr1920450ejz.188.1538573527457; Wed, 03 Oct 2018 06:32:07 -0700 (PDT) Received: from aurora.jms.id.au ([213.244.178.17]) by smtp.gmail.com with ESMTPSA id l34-v6sm547766eda.54.2018.10.03.06.32.05 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 03 Oct 2018 06:32:06 -0700 (PDT) Received: by aurora.jms.id.au (sSMTP sendmail emulation); Wed, 03 Oct 2018 15:32:05 +0200 From: Joel Stanley To: Alessandro Zummo , Alexandre Belloni , linux-rtc@vger.kernel.org Subject: [PATCH 1/2] rtc: Add ASPEED RTC driver Date: Wed, 3 Oct 2018 15:31:54 +0200 Message-Id: <20181003133155.27494-2-joel@jms.id.au> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181003133155.27494-1-joel@jms.id.au> References: <20181003133155.27494-1-joel@jms.id.au> X-BeenThere: linux-aspeed@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux ASPEED SoC development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-aspeed@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, Christian Svensson Errors-To: linux-aspeed-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linux-aspeed" Read and writes the time to the non-battery backed RTC in the ASPEED AST2400 and AST2500 system on chip. Signed-off-by: Joel Stanley --- drivers/rtc/Kconfig | 10 +++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-aspeed.c | 142 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 153 insertions(+) create mode 100644 drivers/rtc/rtc-aspeed.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index a819ef07b7ec..372944b59b69 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1783,6 +1783,16 @@ config RTC_DRV_RTD119X If you say yes here, you get support for the RTD1295 SoC Real Time Clock. +config RTC_DRV_ASPEED + tristate "Aspeed RTC" + depends on ARCH_ASPEED || COMPILE_TEST + help + If you say yes here you get support for the ASPEED AST2400 and + AST2500 SoC real time clocks. + + This driver can also be built as a module, if so, the module + will be called "rtc-aspeed". + comment "HID Sensor RTC drivers" config RTC_DRV_HID_SENSOR_TIME diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 290c1730fb0a..7d924577d133 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -33,6 +33,7 @@ obj-$(CONFIG_RTC_DRV_AC100) += rtc-ac100.o obj-$(CONFIG_RTC_DRV_ARMADA38X) += rtc-armada38x.o obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o obj-$(CONFIG_RTC_DRV_ASM9260) += rtc-asm9260.o +obj-$(CONFIG_RTC_DRV_ASPEED) += rtc-aspeed.o obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o obj-$(CONFIG_RTC_DRV_AT91SAM9) += rtc-at91sam9.o obj-$(CONFIG_RTC_DRV_AU1XXX) += rtc-au1xxx.o diff --git a/drivers/rtc/rtc-aspeed.c b/drivers/rtc/rtc-aspeed.c new file mode 100644 index 000000000000..dce00e594910 --- /dev/null +++ b/drivers/rtc/rtc-aspeed.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2015 IBM Corp. + +#include +#include +#include +#include +#include + +struct aspeed_rtc { + struct rtc_device *rtc_dev; + void __iomem *base; + spinlock_t lock; +}; + +#define RTC_TIME 0x00 +#define RTC_YEAR 0x04 +#define RTC_CTRL 0x10 + +#define RTC_UNLOCK 0x02 +#define RTC_ENABLE 0x01 + +static int aspeed_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct aspeed_rtc *rtc = dev_get_drvdata(dev); + unsigned int cent, year, mon, day, hour, min, sec; + unsigned long flags; + u32 reg1, reg2; + + spin_lock_irqsave(&rtc->lock, flags); + + do { + reg2 = readl(rtc->base + RTC_YEAR); + reg1 = readl(rtc->base + RTC_TIME); + } while (reg2 != readl(rtc->base + RTC_YEAR)); + + day = (reg1 >> 24) & 0x1f; + hour = (reg1 >> 16) & 0x1f; + min = (reg1 >> 8) & 0x3f; + sec = (reg1 >> 0) & 0x3f; + cent = (reg2 >> 16) & 0x1f; + year = (reg2 >> 8) & 0x7f; + /* + * Month is 1-12 in hardware, and 0-11 in struct rtc_time, however we + * are using mktime64 which is 1-12, so no adjustment is necessary + */ + mon = (reg2 >> 0) & 0x0f; + + rtc_time64_to_tm(mktime64(cent * 100 + year, mon, day, hour, min, sec), + tm); + + spin_unlock_irqrestore(&rtc->lock, flags); + + return 0; +} + +static int aspeed_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct aspeed_rtc *rtc = dev_get_drvdata(dev); + unsigned long flags; + u32 reg1, reg2, ctrl; + int year, cent; + + spin_lock_irqsave(&rtc->lock, flags); + + cent = (tm->tm_year + 1900) / 100; + year = tm->tm_year % 100; + + reg1 = (tm->tm_mday << 24) | (tm->tm_hour << 16) | (tm->tm_min << 8) | + tm->tm_sec; + + /* Hardware is 1-12, convert to 0-11 */ + reg2 = ((cent & 0x1f) << 16) | ((year & 0x7f) << 8) | + ((tm->tm_mon & 0xf) + 1); + + ctrl = readl(rtc->base + RTC_CTRL); + writel(ctrl | RTC_UNLOCK, rtc->base + RTC_CTRL); + + writel(reg1, rtc->base + RTC_TIME); + writel(reg2, rtc->base + RTC_YEAR); + + writel(ctrl, rtc->base + RTC_CTRL); + + spin_unlock_irqrestore(&rtc->lock, flags); + + return 0; +} + +static const struct rtc_class_ops aspeed_rtc_ops = { + .read_time = aspeed_rtc_read_time, + .set_time = aspeed_rtc_set_time, +}; + +static int aspeed_rtc_probe(struct platform_device *pdev) +{ + struct resource *res; + struct aspeed_rtc *rtc; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + rtc->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(rtc->base)) + return PTR_ERR(rtc->base); + + platform_set_drvdata(pdev, rtc); + + rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name, + &aspeed_rtc_ops, THIS_MODULE); + + if (IS_ERR(rtc->rtc_dev)) + return PTR_ERR(rtc->rtc_dev); + + spin_lock_init(&rtc->lock); + + /* Enable RTC and clear the unlock bit */ + writel(RTC_ENABLE, rtc->base + RTC_CTRL); + + return 0; +} + +static const struct of_device_id aspeed_rtc_match[] = { + { .compatible = "aspeed,ast2400-rtc", }, + { .compatible = "aspeed,ast2500-rtc", }, + {} +}; +MODULE_DEVICE_TABLE(of, aspeed_rtc_match); + +static struct platform_driver aspeed_rtc_driver = { + .driver = { + .name = "aspeed-rtc", + .of_match_table = of_match_ptr(aspeed_rtc_match), + }, +}; + +module_platform_driver_probe(aspeed_rtc_driver, aspeed_rtc_probe); + +MODULE_DESCRIPTION("Aspeed RTC driver"); +MODULE_AUTHOR("Joel Stanley "); +MODULE_LICENSE("GPL");