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=-16.7 required=3.0 tests=BAYES_00, 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 32BC1C4338F for ; Mon, 2 Aug 2021 06:31:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1BC0060F4B for ; Mon, 2 Aug 2021 06:31:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232493AbhHBGby (ORCPT ); Mon, 2 Aug 2021 02:31:54 -0400 Received: from smtpbg128.qq.com ([106.55.201.39]:56548 "EHLO smtpbg587.qq.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S232428AbhHBGbr (ORCPT ); Mon, 2 Aug 2021 02:31:47 -0400 X-QQ-mid: bizesmtp41t1627885352t59cfljp Received: from localhost.localdomain (unknown [113.89.245.207]) by esmtp6.qq.com (ESMTP) with id ; Mon, 02 Aug 2021 14:22:29 +0800 (CST) X-QQ-SSF: 01100000002000206000B00A0000000 X-QQ-FEAT: vLPYWrwZbqtrOYimloWC80mCd88KyGqnh5+mRCGmtELPdmXRolfov7pigmWm5 UcMMc1kruqGDfB8dF3zFwxrv55vXjltWPzJyOn5O4dvjgjCg/ZU5yRypx/T0HRBT3Wq8Hd0 2pDFFYVFTyo5vecpZsLW5nmFywYduc7P7azcQTDLefsTKkmqgAx/QJdGIHz92E7zSPZxXw4 QsykHj3HRBD5mgCWRFYU+eC46J7V8b+r/LLHr+4XfaLifWYjbJovMux0XTfB7wRsOy7AlKY nprp3HQu36knnVBQ61xr1q2GbLgMdDV5NY84+/MFAk82RhP80QHuy/VzAfqt9ecNEgjAuNp qk6s1yjX/WQq2CiKFI= X-QQ-GoodBg: 0 From: Icenowy Zheng To: Rob Herring , Maxime Ripard , Chen-Yu Tsai , Jernej Skrabec , Ulf Hansson , Linus Walleij , Alexandre Belloni , Andre Przywara , Samuel Holland Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 03/17] rtc: sun6i: Add support for broken-down alarm registers Date: Mon, 2 Aug 2021 14:21:58 +0800 Message-Id: <20210802062212.73220-4-icenowy@sipeed.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210802062212.73220-1-icenowy@sipeed.com> References: <20210802062212.73220-1-icenowy@sipeed.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-QQ-SENDSIZE: 520 Feedback-ID: bizesmtp:sipeed.com:qybgspam:qybgspam5 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Andre Przywara Newer versions of the Allwinner RTC, for instance as found in the H616 SoC, not only store the current day as a linear number, but also change the way the alarm is handled: There are now two registers, that explicitly store the wakeup time, in the same format as the current time. Add support for that variant by writing the requested wakeup time directly into the registers, instead of programming the seconds left, as the old SoCs required. Signed-off-by: Andre Przywara Reviewed by: Jernej Skrabec --- drivers/rtc/rtc-sun6i.c | 57 +++++++++++++++++++++++++++++------------ 1 file changed, 40 insertions(+), 17 deletions(-) diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c index a980d4e7408d..752bea949050 100644 --- a/drivers/rtc/rtc-sun6i.c +++ b/drivers/rtc/rtc-sun6i.c @@ -48,7 +48,8 @@ /* Alarm 0 (counter) */ #define SUN6I_ALRM_COUNTER 0x0020 -#define SUN6I_ALRM_CUR_VAL 0x0024 +/* This holds the remaining alarm seconds on older SoCs (current value) */ +#define SUN6I_ALRM_COUNTER_HMS 0x0024 #define SUN6I_ALRM_EN 0x0028 #define SUN6I_ALRM_EN_CNT_EN BIT(0) #define SUN6I_ALRM_IRQ_EN 0x002c @@ -523,32 +524,54 @@ static int sun6i_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm) struct sun6i_rtc_dev *chip = dev_get_drvdata(dev); struct rtc_time *alrm_tm = &wkalrm->time; struct rtc_time tm_now; - time64_t time_now, time_set; + time64_t time_set; + u32 counter_val, counter_val_hms; int ret; - ret = sun6i_rtc_gettime(dev, &tm_now); - if (ret < 0) { - dev_err(dev, "Error in getting time\n"); - return -EINVAL; - } - time_set = rtc_tm_to_time64(alrm_tm); - time_now = rtc_tm_to_time64(&tm_now); - if (time_set <= time_now) { - dev_err(dev, "Date to set in the past\n"); - return -EINVAL; - } - if ((time_set - time_now) > U32_MAX) { - dev_err(dev, "Date too far in the future\n"); - return -EINVAL; + if (chip->flags & RTC_LINEAR_DAY) { + /* + * The alarm registers hold the actual alarm time, encoded + * in the same way (linear day + HMS) as the current time. + */ + counter_val_hms = SUN6I_TIME_SET_SEC_VALUE(alrm_tm->tm_sec) | + SUN6I_TIME_SET_MIN_VALUE(alrm_tm->tm_min) | + SUN6I_TIME_SET_HOUR_VALUE(alrm_tm->tm_hour); + /* The division will cut off the H:M:S part of alrm_tm. */ + counter_val = div_u64(rtc_tm_to_time64(alrm_tm), SECS_PER_DAY); + } else { + /* The alarm register holds the number of seconds left. */ + time64_t time_now; + + ret = sun6i_rtc_gettime(dev, &tm_now); + if (ret < 0) { + dev_err(dev, "Error in getting time\n"); + return -EINVAL; + } + + time_now = rtc_tm_to_time64(&tm_now); + if (time_set <= time_now) { + dev_err(dev, "Date to set in the past\n"); + return -EINVAL; + } + if ((time_set - time_now) > U32_MAX) { + dev_err(dev, "Date too far in the future\n"); + return -EINVAL; + } + + counter_val = time_set - time_now; } sun6i_rtc_setaie(0, chip); writel(0, chip->base + SUN6I_ALRM_COUNTER); + if (chip->flags & RTC_LINEAR_DAY) + writel(0, chip->base + SUN6I_ALRM_COUNTER_HMS); usleep_range(100, 300); - writel(time_set - time_now, chip->base + SUN6I_ALRM_COUNTER); + writel(counter_val, chip->base + SUN6I_ALRM_COUNTER); + if (chip->flags & RTC_LINEAR_DAY) + writel(counter_val_hms, chip->base + SUN6I_ALRM_COUNTER_HMS); chip->alarm = time_set; sun6i_rtc_setaie(wkalrm->enabled, chip); -- 2.30.2