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rtc: tps6586x: let the core handle rtc range 

Let the core handle offsetting and windowing the RTC range.

The RTC has a 40-bit counter counting at 1024 Hz. So its maximum value is
2^(40-10) - 1. Also, let the core handle the offset instead of coding it in
the callbacks. Keep the default epoch at the beginning of 2009 (this will
fail in 2043).

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
hifive-unleashed-5.1
Alexandre Belloni 2018-05-17 22:48:18 +02:00
parent 63d2206307
commit 180c92c4ae
1 changed files with 5 additions and 22 deletions
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27
drivers/rtc/rtc-tps6586x.c
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@ -58,7 +58,6 @@ struct tps6586x_rtc {
struct rtc_device *rtc;
int irq;
bool irq_en;
time64_t epoch_start;
};
static inline struct device *to_tps6586x_dev(struct device *dev)
@ -68,7 +67,6 @@ static inline struct device *to_tps6586x_dev(struct device *dev)
static int tps6586x_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
struct device *tps_dev = to_tps6586x_dev(dev);
unsigned long long ticks = 0;
time64_t seconds;
@ -88,14 +86,13 @@ static int tps6586x_rtc_read_time(struct device *dev, struct rtc_time *tm)
}
seconds = ticks >> 10;
seconds += rtc->epoch_start;
rtc_time_to_tm(seconds, tm);
rtc_time64_to_tm(seconds, tm);
return 0;
}
static int tps6586x_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
struct device *tps_dev = to_tps6586x_dev(dev);
unsigned long long ticks;
time64_t seconds;
@ -103,11 +100,6 @@ static int tps6586x_rtc_set_time(struct device *dev, struct rtc_time *tm)
int ret;
seconds = rtc_tm_to_time64(tm);
if (seconds < rtc->epoch_start) {
dev_err(dev, "requested time unsupported\n");
return -EINVAL;
}
seconds -= rtc->epoch_start;
ticks = (unsigned long long)seconds << 10;
buff[0] = (ticks >> 32) & 0xff;
@ -155,7 +147,6 @@ static int tps6586x_rtc_alarm_irq_enable(struct device *dev,
static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
struct device *tps_dev = to_tps6586x_dev(dev);
time64_t seconds;
unsigned long ticks;
@ -168,18 +159,12 @@ static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
seconds = rtc_tm_to_time64(&alrm->time);
if (alrm->enabled && (seconds < rtc->epoch_start)) {
dev_err(dev, "can't set alarm to requested time\n");
return -EINVAL;
}
ret = tps6586x_rtc_alarm_irq_enable(dev, alrm->enabled);
if (ret < 0) {
dev_err(dev, "can't set alarm irq, err %d\n", ret);
return ret;
}
seconds -= rtc->epoch_start;
ret = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD,
sizeof(rbuff), rbuff);
if (ret < 0) {
@ -210,7 +195,6 @@ static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
static int tps6586x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct tps6586x_rtc *rtc = dev_get_drvdata(dev);
struct device *tps_dev = to_tps6586x_dev(dev);
unsigned long ticks;
time64_t seconds;
@ -225,7 +209,6 @@ static int tps6586x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
ticks = (buff[0] << 16) | (buff[1] << 8) | buff[2];
seconds = ticks >> 10;
seconds += rtc->epoch_start;
rtc_time64_to_tm(seconds, &alrm->time);
return 0;
@ -260,9 +243,6 @@ static int tps6586x_rtc_probe(struct platform_device *pdev)
rtc->dev = &pdev->dev;
rtc->irq = platform_get_irq(pdev, 0);
/* Set epoch start as 00:00:00:01:01:2009 */
rtc->epoch_start = mktime64(2009, 1, 1, 0, 0, 0);
/* 1 kHz tick mode, enable tick counting */
ret = tps6586x_update(tps_dev, RTC_CTRL,
RTC_ENABLE | OSC_SRC_SEL |
@ -284,6 +264,9 @@ static int tps6586x_rtc_probe(struct platform_device *pdev)
}
rtc->rtc->ops = &tps6586x_rtc_ops;
rtc->rtc->range_max = (1ULL << 30) - 1; /* 30-bit seconds */
rtc->rtc->start_secs = mktime64(2009, 1, 1, 0, 0, 0);
rtc->rtc->set_start_time = true;
ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
tps6586x_rtc_irq,