From patchwork Wed Mar 18 05:45:36 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?RWRkaWUgSHVhbmcgKOm7g+aZuuWCkSk=?= X-Patchwork-Id: 6036441 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id D958D9F39E for ; Wed, 18 Mar 2015 05:50:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 84770204AE for ; Wed, 18 Mar 2015 05:50:57 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 231B2204A9 for ; Wed, 18 Mar 2015 05:50:56 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YY6pG-00034w-Vp; Wed, 18 Mar 2015 05:47:30 +0000 Received: from [210.61.82.184] (helo=mailgw02.mediatek.com) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YY6oK-0002Dl-A4; Wed, 18 Mar 2015 05:46:33 +0000 X-Listener-Flag: 11101 Received: from mtkhts09.mediatek.inc [(172.21.101.70)] by mailgw02.mediatek.com (envelope-from ) (mhqrelay.mediatek.com ESMTP with TLS) with ESMTP id 153669774; Wed, 18 Mar 2015 13:46:10 +0800 Received: from mtkslt208.mediatek.inc (10.21.15.95) by mtkhts09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 14.3.181.6; Wed, 18 Mar 2015 13:46:08 +0800 From: Eddie Huang To: Lee Jones , Alessandro Zummo , Matthias Brugger Subject: [PATCH v2 2/3] rtc: mediatek: Add MT6397 RTC driver Date: Wed, 18 Mar 2015 13:45:36 +0800 Message-ID: <1426657537-41414-3-git-send-email-eddie.huang@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1426657537-41414-1-git-send-email-eddie.huang@mediatek.com> References: <1426657537-41414-1-git-send-email-eddie.huang@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150317_224632_760810_A36ECB09 X-CRM114-Status: GOOD ( 16.76 ) X-Spam-Score: 1.3 (+) Cc: Samuel Ortiz , srv_heupstream@mediatek.com, Mauro Carvalho Chehab , rtc-linux@googlegroups.com, Greg KH , Jingoo Han , linux-kernel@vger.kernel.org, Tianping Fang , Tejun Heo , linux-mediatek@lists.infradead.org, =?UTF-8?q?Uwe=20Kleine-K=C3=83=C2=B6nig?= , Joe Perches , Andrew Morton , Eddie Huang , "David S. Miller" , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Tianping Fang Add Mediatek MT6397 RTC driver Signed-off-by: Tianping Fang Signed-off-by: Eddie Huang --- drivers/rtc/Kconfig | 10 ++ drivers/rtc/Makefile | 1 + drivers/rtc/rtc-mt6397.c | 454 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 465 insertions(+) create mode 100644 drivers/rtc/rtc-mt6397.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index b5b5c3d..dcb94af 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1510,6 +1510,16 @@ config RTC_DRV_MOXART This driver can also be built as a module. If so, the module will be called rtc-moxart +config RTC_DRV_MT6397 + tristate "Mediatek Real Time Clock driver" + depends on MFD_MT6397 || COMPILE_TEST + help + This selects the Mediatek(R) RTC driver. RTC is part of Mediatek + MT6397 PMIC. You should enable MT6397 PMIC MFD before select + Mediatek(R) RTC driver. + + If you want to use Mediatek(R) RTC interface, select Y or M here. + config RTC_DRV_XGENE tristate "APM X-Gene RTC" depends on HAS_IOMEM diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 69c8706..85c8bea 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -153,3 +153,4 @@ obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o obj-$(CONFIG_RTC_DRV_XGENE) += rtc-xgene.o obj-$(CONFIG_RTC_DRV_SIRFSOC) += rtc-sirfsoc.o obj-$(CONFIG_RTC_DRV_MOXART) += rtc-moxart.o +obj-$(CONFIG_RTC_DRV_MT6397) += rtc-mt6397.o diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c new file mode 100644 index 0000000..130480d --- /dev/null +++ b/drivers/rtc/rtc-mt6397.c @@ -0,0 +1,454 @@ +/* +* Copyright (c) 2014-2015 MediaTek Inc. +* Author: Tianping.Fang +* +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License version 2 as +* published by the Free Software Foundation. +* +* This program is distributed in the hope that 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. +*/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define RTC_BBPU 0x0000 +#define RTC_WRTGR 0x003c +#define RTC_IRQ_EN 0x0004 +#define RTC_IRQ_STA 0x0002 + +#define RTC_BBPU_CBUSY (1 << 6) +#define RTC_IRQ_STA_AL (1 << 0) +#define RTC_IRQ_STA_LP (1 << 3) + +#define RTC_AL_MASK 0x0008 +#define RTC_TC_SEC 0x000a +#define RTC_TC_MIN 0x000c +#define RTC_TC_HOU 0x000e +#define RTC_TC_DOM 0x0010 +#define RTC_TC_MTH 0x0014 +#define RTC_TC_YEA 0x0016 +#define RTC_AL_SEC 0x0018 +#define RTC_AL_MIN 0x001a + +#define RTC_IRQ_EN_AL (1 << 0) +#define RTC_IRQ_EN_ONESHOT (1 << 2) +#define RTC_IRQ_EN_LP (1 << 3) +#define RTC_IRQ_EN_ONESHOT_AL (RTC_IRQ_EN_ONESHOT | RTC_IRQ_EN_AL) + +#define RTC_TC_MIN_MASK 0x003f +#define RTC_TC_SEC_MASK 0x003f +#define RTC_TC_HOU_MASK 0x001f +#define RTC_TC_DOM_MASK 0x001f +#define RTC_TC_MTH_MASK 0x000f +#define RTC_TC_YEA_MASK 0x007f + +#define RTC_AL_SEC_MASK 0x003f +#define RTC_AL_MIN_MASK 0x003f +#define RTC_AL_MASK_DOW (1 << 4) + +#define RTC_AL_HOU 0x001c +#define RTC_AL_HOU_MASK 0x001f + +#define RTC_AL_DOM 0x001e +#define RTC_AL_DOM_MASK 0x001f + +#define RTC_AL_MTH 0x0022 +#define RTC_AL_MTH_MASK 0x000f + +#define RTC_AL_YEA 0x0024 +#define RTC_AL_YEA_MASK 0x007f + +#define RTC_PDN2 0x002e +#define RTC_PDN2_PWRON_MTH_MASK 0x000f +#define RTC_PDN2_PWRON_MTH_SHIFT 0 +#define RTC_PDN2_PWRON_ALARM (1 << 4) +#define RTC_PDN2_UART_MASK 0x0060 +#define RTC_PDN2_UART_SHIFT 5 +#define RTC_PDN2_PWRON_YEA_MASK 0x7f00 +#define RTC_PDN2_PWRON_YEA_SHIFT 8 +#define RTC_PDN2_PWRON_LOGO (1 << 15) + +#define RTC_MIN_YEAR 1968 +#define RTC_BASE_YEAR 1900 +#define RTC_NUM_YEARS 128 +#define RTC_MIN_YEAR_OFFSET (RTC_MIN_YEAR - RTC_BASE_YEAR) +#define RTC_RELPWR_WHEN_XRST 1 + +struct mt6397_rtc { + struct device *dev; + struct rtc_device *rtc_dev; + struct mutex lock; + struct regmap *regmap; + int irq; + u32 addr_base; + u32 addr_range; +}; + +static int mtk_rtc_read(struct mt6397_rtc *rtc, u32 offset, u32 *data) +{ + u32 addr = rtc->addr_base + offset; + + if (offset < rtc->addr_range) + return regmap_read(rtc->regmap, addr, data); + + return -EINVAL; +} + +static int mtk_rtc_write(struct mt6397_rtc *rtc, u32 offset, u32 data) +{ + u32 addr; + + addr = rtc->addr_base + offset; + + if (offset < rtc->addr_range) + return regmap_write(rtc->regmap, addr, data); + + return -EINVAL; +} + +static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc) +{ + int ret; + u32 data; + + ret = mtk_rtc_write(rtc, RTC_WRTGR, 1); + if (ret < 0) + goto exit; + + ret = mtk_rtc_read(rtc, RTC_BBPU, &data); + if (ret < 0) + goto exit; + + while (data & RTC_BBPU_CBUSY) { + cpu_relax(); + ret = mtk_rtc_read(rtc, RTC_BBPU, &data); + if (ret < 0) + goto exit; + } + +exit: + return ret; +} + +static irqreturn_t mtk_rtc_irq_handler_thread(int irq, void *data) +{ + struct mt6397_rtc *rtc = data; + u32 irqsta, irqen; + int ret; + + ret = mtk_rtc_read(rtc, RTC_IRQ_STA, &irqsta); + + if ((ret >= 0) && (irqsta & RTC_IRQ_STA_AL)) { + rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF); + irqen = irqsta & ~RTC_IRQ_EN_AL; + mutex_lock(&rtc->lock); + if (mtk_rtc_write(rtc, RTC_IRQ_EN, irqen) < 0) + mtk_rtc_write_trigger(rtc); + mutex_unlock(&rtc->lock); + + return IRQ_HANDLED; + } + + return IRQ_NONE; +} + +static int __mtk_rtc_read_time(struct mt6397_rtc *rtc, + struct rtc_time *tm, int *sec) +{ + int ret; + + mutex_lock(&rtc->lock); + ret = mtk_rtc_read(rtc, RTC_TC_SEC, &tm->tm_sec); + if (ret < 0) + goto exit; + ret = mtk_rtc_read(rtc, RTC_TC_MIN, &tm->tm_min); + if (ret < 0) + goto exit; + ret = mtk_rtc_read(rtc, RTC_TC_HOU, &tm->tm_hour); + if (ret < 0) + goto exit; + ret = mtk_rtc_read(rtc, RTC_TC_DOM, &tm->tm_mday); + if (ret < 0) + goto exit; + ret = mtk_rtc_read(rtc, RTC_TC_MTH, &tm->tm_mon); + if (ret < 0) + goto exit; + ret = mtk_rtc_read(rtc, RTC_TC_YEA, &tm->tm_year); + if (ret < 0) + goto exit; + ret = mtk_rtc_read(rtc, RTC_TC_SEC, sec); + +exit: + mutex_unlock(&rtc->lock); + return ret; +} + +static int mtk_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + time64_t time; + struct mt6397_rtc *rtc = dev_get_drvdata(dev); + int sec, ret; + + do { + ret = __mtk_rtc_read_time(rtc, tm, &sec); + if (ret < 0) + goto exit; + } while (sec < tm->tm_sec); + + tm->tm_year += RTC_MIN_YEAR_OFFSET; + tm->tm_mon--; + time = rtc_tm_to_time64(tm); + + tm->tm_wday = (time / 86400 + 4) % 7; + +exit: + return ret; +} + +static int mtk_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct mt6397_rtc *rtc = dev_get_drvdata(dev); + int ret; + + tm->tm_year -= RTC_MIN_YEAR_OFFSET; + tm->tm_mon++; + + mutex_lock(&rtc->lock); + ret = mtk_rtc_write(rtc, RTC_TC_YEA, tm->tm_year); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_TC_MTH, tm->tm_mon); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_TC_DOM, tm->tm_mday); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_TC_HOU, tm->tm_hour); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_TC_MIN, tm->tm_min); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_TC_SEC, tm->tm_sec); + if (ret < 0) + goto exit; + ret = mtk_rtc_write_trigger(rtc); + +exit: + mutex_unlock(&rtc->lock); + return ret; +} + +static int mtk_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) +{ + struct rtc_time *tm = &alm->time; + struct mt6397_rtc *rtc = dev_get_drvdata(dev); + u32 irqen, pdn2; + int ret; + + mutex_lock(&rtc->lock); + ret = mtk_rtc_read(rtc, RTC_IRQ_EN, &irqen); + if (ret < 0) + goto err_exit; + ret = mtk_rtc_read(rtc, RTC_PDN2, &pdn2); + if (ret < 0) + goto err_exit; + ret = mtk_rtc_read(rtc, RTC_AL_SEC, &tm->tm_sec); + if (ret < 0) + goto err_exit; + ret = mtk_rtc_read(rtc, RTC_AL_MIN, &tm->tm_min); + if (ret < 0) + goto err_exit; + ret = mtk_rtc_read(rtc, RTC_AL_HOU, &tm->tm_hour); + if (ret < 0) + goto err_exit; + ret = mtk_rtc_read(rtc, RTC_AL_DOM, &tm->tm_mday); + if (ret < 0) + goto err_exit; + ret = mtk_rtc_read(rtc, RTC_AL_MTH, &tm->tm_mon); + if (ret < 0) + goto err_exit; + ret = mtk_rtc_read(rtc, RTC_AL_YEA, &tm->tm_year); + if (ret < 0) + goto err_exit; + + alm->enabled = !!(irqen & RTC_IRQ_EN_AL); + alm->pending = !!(pdn2 & RTC_PDN2_PWRON_ALARM); + mutex_unlock(&rtc->lock); + + tm->tm_year += RTC_MIN_YEAR_OFFSET; + tm->tm_mon--; + + return 0; +err_exit: + mutex_unlock(&rtc->lock); + return ret; +} + +static int mtk_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) +{ + struct rtc_time *tm = &alm->time; + struct mt6397_rtc *rtc = dev_get_drvdata(dev); + u32 irqen; + int ret; + + tm->tm_year -= RTC_MIN_YEAR_OFFSET; + tm->tm_mon++; + + mutex_lock(&rtc->lock); + if (alm->enabled) { + ret = mtk_rtc_write(rtc, RTC_AL_YEA, tm->tm_year); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_AL_MTH, tm->tm_mon); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_AL_DOM, tm->tm_mday); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_AL_HOU, tm->tm_hour); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_AL_MIN, tm->tm_min); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_AL_SEC, tm->tm_sec); + if (ret < 0) + goto exit; + ret = mtk_rtc_write(rtc, RTC_AL_MASK, RTC_AL_MASK_DOW); + if (ret < 0) + goto exit; + ret = mtk_rtc_write_trigger(rtc); + if (ret < 0) + goto exit; + ret = mtk_rtc_read(rtc, RTC_IRQ_EN, &irqen); + if (ret < 0) + goto exit; + irqen |= RTC_IRQ_EN_ONESHOT_AL; + ret = mtk_rtc_write(rtc, RTC_IRQ_EN, irqen); + if (ret < 0) + goto exit; + ret = mtk_rtc_write_trigger(rtc); + if (ret < 0) + goto exit; + } else { + ret = mtk_rtc_read(rtc, RTC_IRQ_EN, &irqen); + if (ret < 0) + goto exit; + irqen &= ~RTC_IRQ_EN_ONESHOT_AL; + ret = mtk_rtc_write(rtc, RTC_IRQ_EN, irqen); + if (ret < 0) + goto exit; + } + +exit: + mutex_unlock(&rtc->lock); + return ret; +} + +static struct rtc_class_ops mtk_rtc_ops = { + .read_time = mtk_rtc_read_time, + .set_time = mtk_rtc_set_time, + .read_alarm = mtk_rtc_read_alarm, + .set_alarm = mtk_rtc_set_alarm, +}; + +static int mtk_rtc_probe(struct platform_device *pdev) +{ + struct resource *res; + struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent); + struct mt6397_rtc *rtc; + int ret = 0; + + rtc = devm_kzalloc(&pdev->dev, sizeof(struct mt6397_rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + rtc->addr_base = res->start; + rtc->addr_range = res->end - res->start; + + res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + rtc->irq = irq_create_mapping(mt6397_chip->irq_domain, res->start); + if (rtc->irq <= 0) + goto out_rtc; + + rtc->regmap = mt6397_chip->regmap; + rtc->dev = &pdev->dev; + mutex_init(&rtc->lock); + + platform_set_drvdata(pdev, rtc); + + ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL, + mtk_rtc_irq_handler_thread, + IRQF_ONESHOT | IRQF_TRIGGER_HIGH, + "mt6397-rtc", rtc); + if (ret) { + dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n", + rtc->irq, ret); + goto out_rtc; + } + + rtc->rtc_dev = rtc_device_register("mt6397-rtc", &pdev->dev, + &mtk_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc->rtc_dev)) { + dev_err(&pdev->dev, "register rtc device failed\n"); + return PTR_ERR(rtc->rtc_dev); + } + + device_init_wakeup(&pdev->dev, 1); + + return 0; + +out_rtc: + rtc_device_unregister(rtc->rtc_dev); + return ret; + +} + +static int mtk_rtc_remove(struct platform_device *pdev) +{ + struct mt6397_rtc *rtc = platform_get_drvdata(pdev); + + rtc_device_unregister(rtc->rtc_dev); + return 0; +} + +static const struct of_device_id mt6397_rtc_of_match[] = { + { .compatible = "mediatek,mt6397-rtc", }, + { } +}; + +static struct platform_driver mtk_rtc_driver = { + .driver = { + .name = "mt6397-rtc", + .of_match_table = mt6397_rtc_of_match, + }, + .probe = mtk_rtc_probe, + .remove = mtk_rtc_remove, +}; + +module_platform_driver(mtk_rtc_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Tianping Fang "); +MODULE_DESCRIPTION("RTC Driver for MediaTek MT6397 PMIC"); +MODULE_ALIAS("platform:mt6397-rtc");