Release 4.7 include/asm-generic/rtc.h

/* 
 * include/asm-generic/rtc.h
 *
 * Author: Tom Rini <trini@mvista.com>
 *
 * Based on:
 * drivers/char/rtc.c
 *
 * Please read the COPYING file for all license details.
 */

#ifndef __ASM_RTC_H__

#define __ASM_RTC_H__

#include <linux/mc146818rtc.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/delay.h>
#ifdef CONFIG_ACPI
#include <linux/acpi.h>
#endif


#define RTC_PIE 0x40		
/* periodic interrupt enable */

#define RTC_AIE 0x20		
/* alarm interrupt enable */

#define RTC_UIE 0x10		
/* update-finished interrupt enable */

/* some dummy definitions */

#define RTC_BATT_BAD 0x100	
/* battery bad */

#define RTC_SQWE 0x08		
/* enable square-wave output */

#define RTC_DM_BINARY 0x04	
/* all time/date values are BCD if clear */

#define RTC_24H 0x02		
/* 24 hour mode - else hours bit 7 means pm */

#define RTC_DST_EN 0x01	        
/* auto switch DST - works f. USA only */

/*
 * Returns true if a clock update is in progress
 */


static inline unsigned char rtc_is_updating(void)
{
	unsigned char uip;
	unsigned long flags;

	spin_lock_irqsave(&rtc_lock, flags);
	uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP);
	spin_unlock_irqrestore(&rtc_lock, flags);
	return uip;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
tom rini
tom rini
38
79.17%
1
50.00%
andrew morton
andrew morton
10
20.83%
1
50.00%
Total
48
100.00%
2
100.00%



static inline unsigned int __get_rtc_time(struct rtc_time *time)
{
	unsigned char ctrl;
	unsigned long flags;
	unsigned char century = 0;

#ifdef CONFIG_MACH_DECSTATION
	unsigned int real_year;
#endif

	/*
         * read RTC once any update in progress is done. The update
         * can take just over 2ms. We wait 20ms. There is no need to
         * to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
         * If you need to know *exactly* when a second has started, enable
         * periodic update complete interrupts, (via ioctl) and then 
         * immediately read /dev/rtc which will block until you get the IRQ.
         * Once the read clears, read the RTC time (again via ioctl). Easy.
         */
	if (rtc_is_updating())
		mdelay(20);

	/*
         * Only the values that we read from the RTC are set. We leave
         * tm_wday, tm_yday and tm_isdst untouched. Even though the
         * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
         * by the RTC when initially set to a non-zero value.
         */
	spin_lock_irqsave(&rtc_lock, flags);
	time->tm_sec = CMOS_READ(RTC_SECONDS);
	time->tm_min = CMOS_READ(RTC_MINUTES);
	time->tm_hour = CMOS_READ(RTC_HOURS);
	time->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);
	time->tm_mon = CMOS_READ(RTC_MONTH);
	time->tm_year = CMOS_READ(RTC_YEAR);
#ifdef CONFIG_MACH_DECSTATION
	real_year = CMOS_READ(RTC_DEC_YEAR);
#endif
#ifdef CONFIG_ACPI
	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
	    acpi_gbl_FADT.century)
		century = CMOS_READ(acpi_gbl_FADT.century);
#endif
	ctrl = CMOS_READ(RTC_CONTROL);
	spin_unlock_irqrestore(&rtc_lock, flags);

	if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
	{
		time->tm_sec = bcd2bin(time->tm_sec);
		time->tm_min = bcd2bin(time->tm_min);
		time->tm_hour = bcd2bin(time->tm_hour);
		time->tm_mday = bcd2bin(time->tm_mday);
		time->tm_mon = bcd2bin(time->tm_mon);
		time->tm_year = bcd2bin(time->tm_year);
		century = bcd2bin(century);
	}

#ifdef CONFIG_MACH_DECSTATION
	time->tm_year += real_year - 72;
#endif

	if (century)
		time->tm_year += (century - 19) * 100;

	/*
         * Account for differences between how the RTC uses the values
         * and how they are defined in a struct rtc_time;
         */
	if (time->tm_year <= 69)
		time->tm_year += 100;

	time->tm_mon--;

	return RTC_24H;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
tom rini
tom rini
192
63.37%
1
12.50%
sylvain chouleur
sylvain chouleur
57
18.81%
1
12.50%
adrian bunk
adrian bunk
30
9.90%
1
12.50%
andrew morton
andrew morton
15
4.95%
2
25.00%
ingo molnar
ingo molnar
5
1.65%
1
12.50%
ralf baechle
ralf baechle
3
0.99%
1
12.50%
ivan kokshaysky
ivan kokshaysky
1
0.33%
1
12.50%
Total
303
100.00%
8
100.00%

#ifndef get_rtc_time

#define get_rtc_time	__get_rtc_time
#endif

/* Set the current date and time in the real time clock. */


static inline int __set_rtc_time(struct rtc_time *time)
{
	unsigned long flags;
	unsigned char mon, day, hrs, min, sec;
	unsigned char save_control, save_freq_select;
	unsigned int yrs;
#ifdef CONFIG_MACH_DECSTATION
	unsigned int real_yrs, leap_yr;
#endif
	unsigned char century = 0;

	yrs = time->tm_year;
	mon = time->tm_mon + 1;   /* tm_mon starts at zero */
	day = time->tm_mday;
	hrs = time->tm_hour;
	min = time->tm_min;
	sec = time->tm_sec;

	if (yrs > 255)	/* They are unsigned */
		return -EINVAL;

	spin_lock_irqsave(&rtc_lock, flags);
#ifdef CONFIG_MACH_DECSTATION
	real_yrs = yrs;
	leap_yr = ((!((yrs + 1900) % 4) && ((yrs + 1900) % 100)) ||
			!((yrs + 1900) % 400));
	yrs = 72;

	/*
         * We want to keep the year set to 73 until March
         * for non-leap years, so that Feb, 29th is handled
         * correctly.
         */
	if (!leap_yr && mon < 3) {
		real_yrs--;
		yrs = 73;
	}
#endif

#ifdef CONFIG_ACPI
	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
	    acpi_gbl_FADT.century) {
		century = (yrs + 1900) / 100;
		yrs %= 100;
	}
#endif

	/* These limits and adjustments are independent of
         * whether the chip is in binary mode or not.
         */
	if (yrs > 169) {
		spin_unlock_irqrestore(&rtc_lock, flags);
		return -EINVAL;
	}

	if (yrs >= 100)
		yrs -= 100;

	if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY)
	    || RTC_ALWAYS_BCD) {
		sec = bin2bcd(sec);
		min = bin2bcd(min);
		hrs = bin2bcd(hrs);
		day = bin2bcd(day);
		mon = bin2bcd(mon);
		yrs = bin2bcd(yrs);
		century = bin2bcd(century);
	}

	save_control = CMOS_READ(RTC_CONTROL);
	CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
	save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
	CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);

#ifdef CONFIG_MACH_DECSTATION
	CMOS_WRITE(real_yrs, RTC_DEC_YEAR);
#endif
	CMOS_WRITE(yrs, RTC_YEAR);
	CMOS_WRITE(mon, RTC_MONTH);
	CMOS_WRITE(day, RTC_DAY_OF_MONTH);
	CMOS_WRITE(hrs, RTC_HOURS);
	CMOS_WRITE(min, RTC_MINUTES);
	CMOS_WRITE(sec, RTC_SECONDS);
#ifdef CONFIG_ACPI
	if (acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID &&
	    acpi_gbl_FADT.century)
		CMOS_WRITE(century, acpi_gbl_FADT.century);
#endif

	CMOS_WRITE(save_control, RTC_CONTROL);
	CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);

	spin_unlock_irqrestore(&rtc_lock, flags);

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
tom rini
tom rini
345
75.49%
1
14.29%
sylvain chouleur
sylvain chouleur
76
16.63%
1
14.29%
adrian bunk
adrian bunk
18
3.94%
1
14.29%
linus torvalds
linus torvalds
13
2.84%
1
14.29%
ralf baechle
ralf baechle
3
0.66%
1
14.29%
steven cole
steven cole
1
0.22%
1
14.29%
ivan kokshaysky
ivan kokshaysky
1
0.22%
1
14.29%
Total
457
100.00%
7
100.00%

#ifndef set_rtc_time

#define set_rtc_time	__set_rtc_time
#endif



static inline unsigned int get_rtc_ss(void)
{
	struct rtc_time h;

	get_rtc_time(&h);
	return h.tm_sec;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
tom rini
tom rini
24
96.00%
1
50.00%
arnd bergmann
arnd bergmann
1
4.00%
1
50.00%
Total
25
100.00%
2
100.00%



static inline int get_rtc_pll(struct rtc_pll_info *pll)
{
	return -EINVAL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
tom rini
tom rini
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%



static inline int set_rtc_pll(struct rtc_pll_info *pll)
{
	return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
tom rini
tom rini
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%

#endif /* __ASM_RTC_H__ */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
tom rini
tom rini
684
71.55%
1
7.69%
sylvain chouleur
sylvain chouleur
141
14.75%
1
7.69%
adrian bunk
adrian bunk
48
5.02%
1
7.69%
andrew morton
andrew morton
33
3.45%
3
23.08%
ivan kokshaysky
ivan kokshaysky
20
2.09%
1
7.69%
linus torvalds
linus torvalds
13
1.36%
1
7.69%
ingo molnar
ingo molnar
8
0.84%
1
7.69%
ralf baechle
ralf baechle
6
0.63%
1
7.69%
steven cole
steven cole
1
0.10%
1
7.69%
arnd bergmann
arnd bergmann
1
0.10%
1
7.69%
uwe zeisberger
uwe zeisberger
1
0.10%
1
7.69%
Total
956
100.00%
13
100.00%
  
Directory: include/asm-generic

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.