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From: Andre Przywara <andre.przywara@arm.com>
To: Maxime Ripard <mripard@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
	Jernej Skrabec <jernej.skrabec@gmail.com>
Cc: Rob Herring <robh@kernel.org>, Icenowy Zheng <icenowy@aosc.io>,
	Samuel Holland <samuel@sholland.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-sunxi@googlegroups.com, linux-sunxi@lists.linux.dev,
	linux-kernel@vger.kernel.org, Ondrej Jirman <megous@megous.com>,
	Alessandro Zummo <a.zummo@towertech.it>,
	Alexandre Belloni <alexandre.belloni@bootlin.com>,
	linux-rtc@vger.kernel.org
Subject: [PATCH v9 05/11] rtc: sun6i: Add support for broken-down alarm registers
Date: Mon,  2 Aug 2021 01:39:46 +0100	[thread overview]
Message-ID: <20210802003952.19942-6-andre.przywara@arm.com> (raw)
In-Reply-To: <20210802003952.19942-1-andre.przywara@arm.com>

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 <andre.przywara@arm.com>
Reviewed by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
 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);
-- 
2.17.6


  parent reply	other threads:[~2021-08-02  0:40 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02  0:39 [PATCH v9 00/11] arm64: sunxi: Initial Allwinner H616 SoC support Andre Przywara
2021-08-02  0:39 ` [PATCH v9 01/11] dt-bindings: mfd: axp20x: Add AXP305 compatible (plus optional IRQ) Andre Przywara
2021-08-02  7:40   ` Lee Jones
2021-08-02  0:39 ` [PATCH v9 02/11] dt-bindings: rtc: sun6i: Add H616 compatible string Andre Przywara
2021-08-18  8:15   ` Maxime Ripard
2021-08-02  0:39 ` [PATCH v9 03/11] rtc: sun6i: Fix time overflow handling Andre Przywara
2021-08-02  0:39 ` [PATCH v9 04/11] rtc: sun6i: Add support for linear day storage Andre Przywara
2021-08-02  0:39 ` Andre Przywara [this message]
2021-08-02  0:39 ` [PATCH v9 06/11] rtc: sun6i: Add support for RTCs without external LOSCs Andre Przywara
2021-08-02  0:39 ` [PATCH v9 07/11] rtc: sun6i: Add Allwinner H616 support Andre Przywara
2021-08-02  0:39 ` [PATCH v9 08/11] arm64: dts: allwinner: Add Allwinner H616 .dtsi file Andre Przywara
2021-09-11  4:13   ` Samuel Holland
2021-08-02  0:39 ` [PATCH v9 09/11] dt-bindings: arm: sunxi: Add two H616 board compatible strings Andre Przywara
2021-08-02  0:39 ` [PATCH v9 10/11] arm64: dts: allwinner: h616: Add OrangePi Zero 2 board support Andre Przywara
2021-08-02  0:39 ` [PATCH v9 11/11] arm64: dts: allwinner: h616: Add X96 Mate TV box support Andre Przywara

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