From patchwork Tue Apr 5 18:47:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Miquel Raynal X-Patchwork-Id: 12802279 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2C216C43217 for ; Wed, 6 Apr 2022 02:02:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1391705AbiDFBsn (ORCPT ); Tue, 5 Apr 2022 21:48:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55634 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1573299AbiDESta (ORCPT ); Tue, 5 Apr 2022 14:49:30 -0400 Received: from relay12.mail.gandi.net (relay12.mail.gandi.net [IPv6:2001:4b98:dc4:8::232]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DAFC1AF1E0; Tue, 5 Apr 2022 11:47:29 -0700 (PDT) Received: (Authenticated sender: miquel.raynal@bootlin.com) by mail.gandi.net (Postfix) with ESMTPSA id 8647F20000B; Tue, 5 Apr 2022 18:47:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1649184448; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=H8tLfC+MynAaFO+mev5ezH5oTeB1BvcIj8rvqhct6iM=; b=ErDyOXfHK2ru67T6pT5LPPq/vggqKQPYGjV4yIiDG9xgEKVwAYEmVS91vIG1Trgb3yZHMS xubP8707x/4lMyExERUIW4alJRr/BpFU2ZLWMB6X0REd3qZvcwlNMD4ipDncebUHPpUO2z XFCbHA361kjQLiYPr3rzXPiJ0UQmQLtyTppgEzhjHSnkDdb3bf9aPjBttr7Nhd1pcCuPyk KKiGlH5vVjGoQo3PFdA72EuWd8c8OK4AUS0/BqdY9ZrDCAah8VMEc2+UBBta2bm09+to7O qpIo6001z3vpw7I+kHdfN0kpB3jWOdtZVBAQiAqYRFjA2mCdKzGs1oNTa1p7gQ== From: Miquel Raynal To: Alessandro Zummo , Alexandre Belloni Cc: Rob Herring , devicetree@vger.kernel.org, Krzysztof Kozlowski , linux-renesas-soc@vger.kernel.org, Magnus Damm , Gareth Williams , Phil Edworthy , Geert Uytterhoeven , Stephen Boyd , Michael Turquette , linux-clk@vger.kernel.org, Milan Stevanovic , Jimmy Lalande , Pascal Eberhard , Thomas Petazzoni , Herve Codina , Clement Leger , linux-rtc@vger.kernel.org, Miquel Raynal Subject: [PATCH 4/7] rtc: rzn1: Add alarm support Date: Tue, 5 Apr 2022 20:47:13 +0200 Message-Id: <20220405184716.1578385-5-miquel.raynal@bootlin.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220405184716.1578385-1-miquel.raynal@bootlin.com> References: <20220405184716.1578385-1-miquel.raynal@bootlin.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org The RZN1 RTC can trigger an interrupt when reaching a particular date up to 7 days ahead. Bring support for this alarm. One drawback though, the granularity is about a minute. Signed-off-by: Miquel Raynal --- drivers/rtc/rtc-rzn1.c | 108 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c index 15c533333930..85c5a68944a0 100644 --- a/drivers/rtc/rtc-rzn1.c +++ b/drivers/rtc/rtc-rzn1.c @@ -154,14 +154,110 @@ static int rzn1_rtc_set_time(struct device *dev, struct rtc_time *tm) return ret; } +static irqreturn_t rzn1_rtc_alarm_irq(int irq, void *dev_id) +{ + struct rzn1_rtc *rtc = dev_id; + + rtc_update_irq(rtc->rtcdev, 1, RTC_AF | RTC_IRQF); + + return IRQ_HANDLED; +} + +static int rzn1_rtc_alarm_irq_enable(struct device *dev, unsigned int enable) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + u32 ctl1 = readl(rtc->base + RZN1_RTC_CTL1); + + if (enable) + ctl1 |= RZN1_RTC_CTL1_ALME; + else + ctl1 &= ~RZN1_RTC_CTL1_ALME; + + writel(ctl1, rtc->base + RZN1_RTC_CTL1); + + return 0; +} + +static int rzn1_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + struct rtc_time *tm = &alrm->time; + unsigned int min, hour, wday, delta_days; + u32 ctl1; + int ret; + + ret = rzn1_rtc_read_time(dev, tm); + if (ret) + return ret; + + min = readl(rtc->base + RZN1_RTC_ALM); + hour = readl(rtc->base + RZN1_RTC_ALH); + wday = readl(rtc->base + RZN1_RTC_ALW); + + tm->tm_sec = 0; + tm->tm_min = bcd2bin(min); + tm->tm_hour = bcd2bin(hour); + delta_days = ((fls(wday) - 1) - tm->tm_wday + 7) % 7; + tm->tm_wday = fls(wday) - 1; + tm->tm_mday += delta_days; + if (delta_days > rtc_month_days(tm->tm_mon, tm->tm_year)) { + tm->tm_mday %= rtc_month_days(tm->tm_mon, tm->tm_year); + tm->tm_mon++; + } + if (tm->tm_mon > 12) { + tm->tm_mon %= 12; + tm->tm_year++; + } + + ctl1 = readl(rtc->base + RZN1_RTC_CTL1); + alrm->enabled = !!(ctl1 & RZN1_RTC_CTL1_ALME); + + return 0; +} + +static int rzn1_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct rzn1_rtc *rtc = dev_get_drvdata(dev); + struct rtc_time *tm = &alrm->time, tm_now; + unsigned long alarm, farest; + unsigned int days_ahead, wday; + int ret; + + ret = rzn1_rtc_read_time(dev, &tm_now); + if (ret) + return ret; + + /* We cannot set alarms more than one week ahead */ + farest = rtc_tm_to_time64(&tm_now) + (7 * 86400); + alarm = rtc_tm_to_time64(tm); + if (time_after(alarm, farest)) + return -EOPNOTSUPP; + + /* Convert alarm day into week day */ + days_ahead = tm->tm_mday - tm_now.tm_mday; + wday = (tm_now.tm_wday + days_ahead) % 7; + + writel(bin2bcd(tm->tm_min), rtc->base + RZN1_RTC_ALM); + writel(bin2bcd(tm->tm_hour), rtc->base + RZN1_RTC_ALH); + writel(BIT(wday), rtc->base + RZN1_RTC_ALW); + + rzn1_rtc_alarm_irq_enable(dev, alrm->enabled); + + return 0; +} + static const struct rtc_class_ops rzn1_rtc_ops = { .read_time = rzn1_rtc_read_time, .set_time = rzn1_rtc_set_time, + .read_alarm = rzn1_rtc_read_alarm, + .set_alarm = rzn1_rtc_set_alarm, + .alarm_irq_enable = rzn1_rtc_alarm_irq_enable, }; static int rzn1_rtc_probe(struct platform_device *pdev) { struct rzn1_rtc *rtc; + int alarm_irq; int ret; rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); @@ -178,12 +274,17 @@ static int rzn1_rtc_probe(struct platform_device *pdev) if (IS_ERR(rtc->base)) return dev_err_probe(&pdev->dev, PTR_ERR(rtc->base), "Missing reg\n"); + alarm_irq = platform_get_irq(pdev, 0); + if (alarm_irq < 0) + return dev_err_probe(&pdev->dev, alarm_irq, "Missing timer IRQ\n"); + rtc->rtcdev = devm_rtc_allocate_device(&pdev->dev); if (IS_ERR(rtc->rtcdev)) return PTR_ERR(rtc); rtc->rtcdev->range_max = 3178591199UL; /* 100 years */ rtc->rtcdev->ops = &rzn1_rtc_ops; + set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->rtcdev->features); ret = r9a06g032_sysctrl_enable_rtc(true); if (ret) @@ -206,6 +307,13 @@ static int rzn1_rtc_probe(struct platform_device *pdev) /* Enable counter operation */ writel(0, rtc->base + RZN1_RTC_CTL2); + ret = devm_request_irq(&pdev->dev, alarm_irq, rzn1_rtc_alarm_irq, 0, + dev_name(&pdev->dev), rtc); + if (ret) { + dev_err(&pdev->dev, "RTC timer interrupt not available\n"); + goto disable_clk; + } + ret = devm_rtc_register_device(rtc->rtcdev); if (ret) { dev_err(&pdev->dev, "Failed to register RTC\n");