From 5c9c11e2da43d8865cc71e59accf6cad8f04404a Mon Sep 17 00:00:00 2001 From: Andre Przywara Date: Fri, 4 Jun 2021 12:12:27 +0100 Subject: [PATCH 014/101] drv:rtc:sun6i: Add support for broken-down alarm registers 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 d47389b5f..8e443952c 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 @@ -527,32 +528,54 @@ 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); -- 2.31.1