drivers/rtc/rtc-mv.c

Source file repositories/reference/linux-study-clean/drivers/rtc/rtc-mv.c

File Facts

System
Linux kernel
Corpus path
drivers/rtc/rtc-mv.c
Extension
.c
Size
8818 bytes
Lines
324
Domain
Driver Families
Bucket
drivers/rtc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rtc_plat_data {
	struct rtc_device *rtc;
	void __iomem *ioaddr;
	int		irq;
	struct clk	*clk;
};

static int mv_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32	rtc_reg;

	rtc_reg = (bin2bcd(tm->tm_sec) << RTC_SECONDS_OFFS) |
		(bin2bcd(tm->tm_min) << RTC_MINUTES_OFFS) |
		(bin2bcd(tm->tm_hour) << RTC_HOURS_OFFS) |
		(bin2bcd(tm->tm_wday) << RTC_WDAY_OFFS);
	writel(rtc_reg, ioaddr + RTC_TIME_REG_OFFS);

	rtc_reg = (bin2bcd(tm->tm_mday) << RTC_MDAY_OFFS) |
		(bin2bcd(tm->tm_mon + 1) << RTC_MONTH_OFFS) |
		(bin2bcd(tm->tm_year - 100) << RTC_YEAR_OFFS);
	writel(rtc_reg, ioaddr + RTC_DATE_REG_OFFS);

	return 0;
}

static int mv_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32	rtc_time, rtc_date;
	unsigned int year, month, day, hour, minute, second, wday;

	rtc_time = readl(ioaddr + RTC_TIME_REG_OFFS);
	rtc_date = readl(ioaddr + RTC_DATE_REG_OFFS);

	second = rtc_time & 0x7f;
	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

	day = rtc_date & 0x3f;
	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

	tm->tm_sec = bcd2bin(second);
	tm->tm_min = bcd2bin(minute);
	tm->tm_hour = bcd2bin(hour);
	tm->tm_mday = bcd2bin(day);
	tm->tm_wday = bcd2bin(wday);
	tm->tm_mon = bcd2bin(month) - 1;
	/* hw counts from year 2000, but tm_year is relative to 1900 */
	tm->tm_year = bcd2bin(year) + 100;

	return 0;
}

static int mv_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
{
	struct rtc_plat_data *pdata = dev_get_drvdata(dev);
	void __iomem *ioaddr = pdata->ioaddr;
	u32	rtc_time, rtc_date;
	unsigned int year, month, day, hour, minute, second, wday;

	rtc_time = readl(ioaddr + RTC_ALARM_TIME_REG_OFFS);
	rtc_date = readl(ioaddr + RTC_ALARM_DATE_REG_OFFS);

	second = rtc_time & 0x7f;
	minute = (rtc_time >> RTC_MINUTES_OFFS) & 0x7f;
	hour = (rtc_time >> RTC_HOURS_OFFS) & 0x3f; /* assume 24 hour mode */
	wday = (rtc_time >> RTC_WDAY_OFFS) & 0x7;

	day = rtc_date & 0x3f;
	month = (rtc_date >> RTC_MONTH_OFFS) & 0x3f;
	year = (rtc_date >> RTC_YEAR_OFFS) & 0xff;

	alm->time.tm_sec = bcd2bin(second);
	alm->time.tm_min = bcd2bin(minute);
	alm->time.tm_hour = bcd2bin(hour);
	alm->time.tm_mday = bcd2bin(day);
	alm->time.tm_wday = bcd2bin(wday);
	alm->time.tm_mon = bcd2bin(month) - 1;
	/* hw counts from year 2000, but tm_year is relative to 1900 */
	alm->time.tm_year = bcd2bin(year) + 100;

	alm->enabled = !!readl(ioaddr + RTC_ALARM_INTERRUPT_MASK_REG_OFFS);

	return rtc_valid_tm(&alm->time);
}

Annotation

Implementation Notes