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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 6B2ADC47093 for ; Wed, 2 Jun 2021 15:19:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 56534613B4 for ; Wed, 2 Jun 2021 15:19:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232357AbhFBPUo (ORCPT ); Wed, 2 Jun 2021 11:20:44 -0400 Received: from smtp-out1.suse.de ([195.135.220.28]:60112 "EHLO smtp-out1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232231AbhFBPUO (ORCPT ); Wed, 2 Jun 2021 11:20:14 -0400 Received: from relay2.suse.de (unknown [149.44.160.134]) by smtp-out1.suse.de (Postfix) with ESMTP id 7E5BF22D67; Wed, 2 Jun 2021 15:18:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1622647109; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=bEAqO4ULpxCsXaufPKqbIo1XP/NQFlS+c7RV1a4/vUQ=; b=hm5Jc38GhMAXMLIf8U37cUfCcTntJzq6Zd3uoZG8cz541RTqE4UMjOCX5/tSy34tQU4gbc 0ylqiDIbKyalosBahkjlKuOuHbFDszzPQdD0puIanRlUiMjb+NgBooAlJICh0Q3IS2C/kN NbPrTwnmrKu3T3H2R0pPdrVaLzerFCg= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1622647109; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=bEAqO4ULpxCsXaufPKqbIo1XP/NQFlS+c7RV1a4/vUQ=; b=f6iMM1oY2iORpoB26Z3eZAK3IxL2pWbK9B5Ff8vpG1o1cW2v8TXyk4tbZYjlPf1P1Fe2zt G30B82MHuuzqskDw== Received: by relay2.suse.de (Postfix, from userid 51) id 7A1D8A3D18; Wed, 2 Jun 2021 16:03:43 +0000 (UTC) Received: from un68u.suse.de (unknown [10.163.42.126]) by relay2.suse.de (Postfix) with ESMTP id 2AF22A48D7; Wed, 2 Jun 2021 10:50:24 +0000 (UTC) From: Mian Yousaf Kaukab To: a.zummo@towertech.it, alexandre.belloni@bootlin.com Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, biwen.li@nxp.com, Mian Yousaf Kaukab Subject: [PATCH RESEND v4] rtc: pcf2127: handle timestamp interrupts Date: Wed, 2 Jun 2021 12:49:56 +0200 Message-Id: <20210602104956.806-1-ykaukab@suse.de> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org commit 03623b4b041c ("rtc: pcf2127: add tamper detection support") added support for timestamp interrupts. However they are not being handled in the irq handler. If a timestamp interrupt occurs it results in kernel disabling the interrupt and displaying the call trace: [ 121.145580] irq 78: nobody cared (try booting with the "irqpoll" option) ... [ 121.238087] [<00000000c4d69393>] irq_default_primary_handler threaded [<000000000a90d25b>] pcf2127_rtc_irq [rtc_pcf2127] [ 121.248971] Disabling IRQ #78 Handle timestamp interrupts in pcf2127_rtc_irq(). Save time stamp before clearing TSF1 and TSF2 flags so that it can't be overwritten. Set a flag to mark if the timestamp is valid and only report to sysfs if the flag is set. To mimic the hardware behavior, don’t save another timestamp until the first one has been read by the userspace. Signed-off-by: Mian Yousaf Kaukab --- drivers/rtc/rtc-pcf2127.c | 130 ++++++++++++++++++++++---------------- 1 file changed, 76 insertions(+), 54 deletions(-) diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c index d13c20a2adf7..7d55f737f38e 100644 --- a/drivers/rtc/rtc-pcf2127.c +++ b/drivers/rtc/rtc-pcf2127.c @@ -94,10 +94,19 @@ #define PCF2127_WD_VAL_MAX 255 #define PCF2127_WD_VAL_DEFAULT 60 +/* Mask for currently enabled interrupts */ +#define PCF2127_CTRL1_IRQ_MASK (PCF2127_BIT_CTRL1_TSF1) +#define PCF2127_CTRL2_IRQ_MASK ( \ + PCF2127_BIT_CTRL2_AF | \ + PCF2127_BIT_CTRL2_WDTF | \ + PCF2127_BIT_CTRL2_TSF2) + struct pcf2127 { struct rtc_device *rtc; struct watchdog_device wdd; struct regmap *regmap; + time64_t ts; + bool ts_valid; }; /* @@ -434,23 +443,82 @@ static int pcf2127_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) return pcf2127_rtc_alarm_irq_enable(dev, alrm->enabled); } +static void pcf2127_rtc_ts_snapshot(struct device *dev) +{ + struct pcf2127 *pcf2127 = dev_get_drvdata(dev); + struct rtc_time tm; + int ret; + unsigned char data[25]; + + /* Let userspace read the first timestamp */ + if (pcf2127->ts_valid) + return; + + ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_CTRL1, data, + sizeof(data)); + if (ret) { + dev_err(dev, "%s: read error ret=%d\n", __func__, ret); + return; + } + + dev_dbg(dev, + "%s: raw data is cr1=%02x, cr2=%02x, cr3=%02x, ts_sc=%02x, ts_mn=%02x, ts_hr=%02x, ts_dm=%02x, ts_mo=%02x, ts_yr=%02x\n", + __func__, data[PCF2127_REG_CTRL1], data[PCF2127_REG_CTRL2], + data[PCF2127_REG_CTRL3], data[PCF2127_REG_TS_SC], + data[PCF2127_REG_TS_MN], data[PCF2127_REG_TS_HR], + data[PCF2127_REG_TS_DM], data[PCF2127_REG_TS_MO], + data[PCF2127_REG_TS_YR]); + + tm.tm_sec = bcd2bin(data[PCF2127_REG_TS_SC] & 0x7F); + tm.tm_min = bcd2bin(data[PCF2127_REG_TS_MN] & 0x7F); + tm.tm_hour = bcd2bin(data[PCF2127_REG_TS_HR] & 0x3F); + tm.tm_mday = bcd2bin(data[PCF2127_REG_TS_DM] & 0x3F); + /* TS_MO register (month) value range: 1-12 */ + tm.tm_mon = bcd2bin(data[PCF2127_REG_TS_MO] & 0x1F) - 1; + tm.tm_year = bcd2bin(data[PCF2127_REG_TS_YR]); + if (tm.tm_year < 70) + tm.tm_year += 100; /* assume we are in 1970...2069 */ + + ret = rtc_valid_tm(&tm); + if (ret) { + dev_err(dev, "Invalid timestamp. ret=%d\n", ret); + return; + } + + pcf2127->ts = rtc_tm_to_time64(&tm); + pcf2127->ts_valid = true; +}; + static irqreturn_t pcf2127_rtc_irq(int irq, void *dev) { struct pcf2127 *pcf2127 = dev_get_drvdata(dev); - unsigned int ctrl2 = 0; + unsigned int ctrl1, ctrl2; int ret = 0; + ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL1, &ctrl1); + if (ret) + return IRQ_NONE; + ret = regmap_read(pcf2127->regmap, PCF2127_REG_CTRL2, &ctrl2); if (ret) return IRQ_NONE; - if (!(ctrl2 & PCF2127_BIT_CTRL2_AF)) + if (!(ctrl1 & PCF2127_CTRL1_IRQ_MASK || ctrl2 & PCF2127_CTRL2_IRQ_MASK)) return IRQ_NONE; - regmap_write(pcf2127->regmap, PCF2127_REG_CTRL2, - ctrl2 & ~(PCF2127_BIT_CTRL2_AF | PCF2127_BIT_CTRL2_WDTF)); + if (ctrl1 & PCF2127_BIT_CTRL1_TSF1 || ctrl2 & PCF2127_BIT_CTRL2_TSF2) + pcf2127_rtc_ts_snapshot(dev); - rtc_update_irq(pcf2127->rtc, 1, RTC_IRQF | RTC_AF); + if (ctrl1 & PCF2127_CTRL1_IRQ_MASK) + regmap_write(pcf2127->regmap, PCF2127_REG_CTRL1, + ctrl1 & ~PCF2127_CTRL1_IRQ_MASK); + + if (ctrl2 & PCF2127_CTRL2_IRQ_MASK) + regmap_write(pcf2127->regmap, PCF2127_REG_CTRL2, + ctrl2 & ~PCF2127_CTRL2_IRQ_MASK); + + if (ctrl2 & PCF2127_BIT_CTRL2_AF) + rtc_update_irq(pcf2127->rtc, 1, RTC_IRQF | RTC_AF); pcf2127_wdt_active_ping(&pcf2127->wdd); @@ -475,19 +543,7 @@ static ssize_t timestamp0_store(struct device *dev, struct pcf2127 *pcf2127 = dev_get_drvdata(dev->parent); int ret; - ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL1, - PCF2127_BIT_CTRL1_TSF1, 0); - if (ret) { - dev_err(dev, "%s: update ctrl1 ret=%d\n", __func__, ret); - return ret; - } - - ret = regmap_update_bits(pcf2127->regmap, PCF2127_REG_CTRL2, - PCF2127_BIT_CTRL2_TSF2, 0); - if (ret) { - dev_err(dev, "%s: update ctrl2 ret=%d\n", __func__, ret); - return ret; - } + pcf2127->ts_valid = false; ret = pcf2127_wdt_active_ping(&pcf2127->wdd); if (ret) @@ -500,50 +556,16 @@ static ssize_t timestamp0_show(struct device *dev, struct device_attribute *attr, char *buf) { struct pcf2127 *pcf2127 = dev_get_drvdata(dev->parent); - struct rtc_time tm; int ret; - unsigned char data[25]; - - ret = regmap_bulk_read(pcf2127->regmap, PCF2127_REG_CTRL1, data, - sizeof(data)); - if (ret) { - dev_err(dev, "%s: read error ret=%d\n", __func__, ret); - return ret; - } - - dev_dbg(dev, - "%s: raw data is cr1=%02x, cr2=%02x, cr3=%02x, ts_sc=%02x, " - "ts_mn=%02x, ts_hr=%02x, ts_dm=%02x, ts_mo=%02x, ts_yr=%02x\n", - __func__, data[PCF2127_REG_CTRL1], data[PCF2127_REG_CTRL2], - data[PCF2127_REG_CTRL3], data[PCF2127_REG_TS_SC], - data[PCF2127_REG_TS_MN], data[PCF2127_REG_TS_HR], - data[PCF2127_REG_TS_DM], data[PCF2127_REG_TS_MO], - data[PCF2127_REG_TS_YR]); ret = pcf2127_wdt_active_ping(&pcf2127->wdd); if (ret) return ret; - if (!(data[PCF2127_REG_CTRL1] & PCF2127_BIT_CTRL1_TSF1) && - !(data[PCF2127_REG_CTRL2] & PCF2127_BIT_CTRL2_TSF2)) + if (!pcf2127->ts_valid) return 0; - tm.tm_sec = bcd2bin(data[PCF2127_REG_TS_SC] & 0x7F); - tm.tm_min = bcd2bin(data[PCF2127_REG_TS_MN] & 0x7F); - tm.tm_hour = bcd2bin(data[PCF2127_REG_TS_HR] & 0x3F); - tm.tm_mday = bcd2bin(data[PCF2127_REG_TS_DM] & 0x3F); - /* TS_MO register (month) value range: 1-12 */ - tm.tm_mon = bcd2bin(data[PCF2127_REG_TS_MO] & 0x1F) - 1; - tm.tm_year = bcd2bin(data[PCF2127_REG_TS_YR]); - if (tm.tm_year < 70) - tm.tm_year += 100; /* assume we are in 1970...2069 */ - - ret = rtc_valid_tm(&tm); - if (ret) - return ret; - - return sprintf(buf, "%llu\n", - (unsigned long long)rtc_tm_to_time64(&tm)); + return sprintf(buf, "%llu\n", (unsigned long long)pcf2127->ts); }; static DEVICE_ATTR_RW(timestamp0); -- 2.26.2