Viewing file: 
rtc.h (3.12 KB) -rw-r--r--Select action/file-type:
(
+) |
(
+) |
(
+) |
Code (
+) |
Session (
+) |
(
+) |
SDB (
+) |
(
+) |
(
+) |
(
+) |
(
+) |
(
+) |
/*
* include/asm-parisc/rtc.h
*
* Copyright 2002 Randolph CHung <tausq@debian.org>
*
* Based on: include/asm-ppc/rtc.h and the genrtc driver in the
* 2.4 parisc linux tree
*/
#ifndef __ASM_RTC_H__
#define __ASM_RTC_H__
#ifdef __KERNEL__
#include <linux/rtc.h>
#include <asm/pdc.h>
#define SECS_PER_HOUR (60 * 60)
#define SECS_PER_DAY (SECS_PER_HOUR * 24)
#define RTC_PIE 0x40 /* periodic interrupt enable */
#define RTC_AIE 0x20 /* alarm interrupt enable */
#define RTC_UIE 0x10 /* update-finished interrupt enable */
#define RTC_BATT_BAD 0x100 /* battery bad */
/* some dummy definitions */
#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 */
# define __isleap(year) \
((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
/* How many days come before each month (0-12). */
static const unsigned short int __mon_yday[2][13] =
{
/* Normal years. */
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
/* Leap years. */
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
static inline unsigned int get_rtc_time(struct rtc_time *wtime)
{
struct pdc_tod tod_data;
long int days, rem, y;
const unsigned short int *ip;
memset(wtime, 0, sizeof(*wtime));
if (pdc_tod_read(&tod_data) < 0)
return RTC_24H | RTC_BATT_BAD;
// most of the remainder of this function is:
// Copyright (C) 1991, 1993, 1997, 1998 Free Software Foundation, Inc.
// This was originally a part of the GNU C Library.
// It is distributed under the GPL, and was swiped from offtime.c
days = tod_data.tod_sec / SECS_PER_DAY;
rem = tod_data.tod_sec % SECS_PER_DAY;
wtime->tm_hour = rem / SECS_PER_HOUR;
rem %= SECS_PER_HOUR;
wtime->tm_min = rem / 60;
wtime->tm_sec = rem % 60;
y = 1970;
#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
while (days < 0 || days >= (__isleap (y) ? 366 : 365))
{
/* Guess a corrected year, assuming 365 days per year. */
long int yg = y + days / 365 - (days % 365 < 0);
/* Adjust DAYS and Y to match the guessed year. */
days -= ((yg - y) * 365
+ LEAPS_THRU_END_OF (yg - 1)
- LEAPS_THRU_END_OF (y - 1));
y = yg;
}
wtime->tm_year = y - 1900;
ip = __mon_yday[__isleap(y)];
for (y = 11; days < (long int) ip[y]; --y)
continue;
days -= ip[y];
wtime->tm_mon = y;
wtime->tm_mday = days + 1;
return RTC_24H;
}
static int set_rtc_time(struct rtc_time *wtime)
{
u_int32_t secs;
secs = mktime(wtime->tm_year + 1900, wtime->tm_mon + 1, wtime->tm_mday,
wtime->tm_hour, wtime->tm_min, wtime->tm_sec);
if(pdc_tod_set(secs, 0) < 0)
return -1;
else
return 0;
}
static inline unsigned int get_rtc_ss(void)
{
struct rtc_time h;
get_rtc_time(&h);
return h.tm_sec;
}
static inline int get_rtc_pll(struct rtc_pll_info *pll)
{
return -EINVAL;
}
static inline int set_rtc_pll(struct rtc_pll_info *pll)
{
return -EINVAL;
}
#endif /* __KERNEL__ */
#endif /* __ASM_RTC_H__ */
