[people/ms/u-boot.git] / drivers / rtc / bfin_rtc.c

/*
 * Copyright (c) 2004-2008 Analog Devices Inc.
 *
 * (C) Copyright 2001
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * Licensed under the GPL-2 or later.
 */

#include <common.h>
#include <command.h>
#include <rtc.h>

#if defined(CONFIG_CMD_DATE)

#include <asm/blackfin.h>
#include <asm/mach-common/bits/rtc.h>

#define pr_stamp() debug("%s:%s:%i: here i am\n", __FILE__, __func__, __LINE__)

#define MIN_TO_SECS(x)    (60 * (x))
#define HRS_TO_SECS(x)    (60 * MIN_TO_SECS(x))
#define DAYS_TO_SECS(x)   (24 * HRS_TO_SECS(x))

#define NUM_SECS_IN_MIN   MIN_TO_SECS(1)
#define NUM_SECS_IN_HR    HRS_TO_SECS(1)
#define NUM_SECS_IN_DAY   DAYS_TO_SECS(1)

/* Enable the RTC prescaler enable register */
void rtc_init(void)
{
	if (!(bfin_read_RTC_PREN() & 0x1))
		bfin_write_RTC_PREN(0x1);
}

/* Our on-chip RTC has no notion of "reset" */
void rtc_reset(void)
{
	rtc_init();
}

/* Wait for pending writes to complete */
static void wait_for_complete(void)
{
	pr_stamp();
	while (!(bfin_read_RTC_ISTAT() & WRITE_COMPLETE))
		if (!(bfin_read_RTC_ISTAT() & WRITE_PENDING))
			break;
	bfin_write_RTC_ISTAT(WRITE_COMPLETE);
}

/* Set the time. Get the time_in_secs which is the number of seconds since Jan 1970 and set the RTC registers
 * based on this value.
 */
int rtc_set(struct rtc_time *tmp)
{
	unsigned long remain, days, hrs, mins, secs;

	pr_stamp();

	if (tmp == NULL) {
		puts("Error setting the date/time\n");
		return -1;
	}

	rtc_init();
	wait_for_complete();

	/* Calculate number of seconds this incoming time represents */
	remain = rtc_mktime(tmp);

	/* Figure out how many days since epoch */
	days = remain / NUM_SECS_IN_DAY;

	/* From the remaining secs, compute the hrs(0-23), mins(0-59) and secs(0-59) */
	remain = remain % NUM_SECS_IN_DAY;
	hrs = remain / NUM_SECS_IN_HR;
	remain = remain % NUM_SECS_IN_HR;
	mins = remain / NUM_SECS_IN_MIN;
	secs = remain % NUM_SECS_IN_MIN;

	/* Encode these time values into our RTC_STAT register */
	bfin_write_RTC_STAT(SET_ALARM(days, hrs, mins, secs));

	return 0;
}

/* Read the time from the RTC_STAT. time_in_seconds is seconds since Jan 1970 */
int rtc_get(struct rtc_time *tmp)
{
	uint32_t cur_rtc_stat;
	int time_in_sec;
	int tm_sec, tm_min, tm_hr, tm_day;

	pr_stamp();

	if (tmp == NULL) {
		puts("Error getting the date/time\n");
		return -1;
	}

	rtc_init();
	wait_for_complete();

	/* Read the RTC_STAT register */
	cur_rtc_stat = bfin_read_RTC_STAT();

	/* Convert our encoded format into actual time values */
	tm_sec = (cur_rtc_stat & RTC_SEC) >> RTC_SEC_P;
	tm_min = (cur_rtc_stat & RTC_MIN) >> RTC_MIN_P;
	tm_hr  = (cur_rtc_stat & RTC_HR ) >> RTC_HR_P;
	tm_day = (cur_rtc_stat & RTC_DAY) >> RTC_DAY_P;

	/* Calculate the total number of seconds since epoch */
	time_in_sec = (tm_sec) + MIN_TO_SECS(tm_min) + HRS_TO_SECS(tm_hr) + DAYS_TO_SECS(tm_day);
	rtc_to_tm(time_in_sec, tmp);

	return 0;
}

#endif
Commit	Line	Data
b58d8b48 MF	1	/*
	2	* Copyright (c) 2004-2008 Analog Devices Inc.
	3	*
	4	* (C) Copyright 2001
	5	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	6	*
	7	* Licensed under the GPL-2 or later.
	8	*/
	9
	10	#include <common.h>
	11	#include <command.h>
	12	#include <rtc.h>
	13
871c18dd	14	#if defined(CONFIG_CMD_DATE)
b58d8b48 MF	15
	16	#include <asm/blackfin.h>
	17	#include <asm/mach-common/bits/rtc.h>
	18
	19	#define pr_stamp() debug("%s:%s:%i: here i am\n", __FILE__, __func__, __LINE__)
	20
	21	#define MIN_TO_SECS(x) (60 * (x))
	22	#define HRS_TO_SECS(x) (60 * MIN_TO_SECS(x))
	23	#define DAYS_TO_SECS(x) (24 * HRS_TO_SECS(x))
	24
	25	#define NUM_SECS_IN_MIN MIN_TO_SECS(1)
	26	#define NUM_SECS_IN_HR HRS_TO_SECS(1)
	27	#define NUM_SECS_IN_DAY DAYS_TO_SECS(1)
	28
3c879898	29	/* Enable the RTC prescaler enable register */
c6577f72	30	void rtc_init(void)
3c879898 MF	31	{
	32	if (!(bfin_read_RTC_PREN() & 0x1))
	33	bfin_write_RTC_PREN(0x1);
	34	}
	35
b58d8b48 MF	36	/* Our on-chip RTC has no notion of "reset" */
	37	void rtc_reset(void)
	38	{
3c879898	39	rtc_init();
b58d8b48 MF	40	}
	41
	42	/* Wait for pending writes to complete */
	43	static void wait_for_complete(void)
	44	{
	45	pr_stamp();
	46	while (!(bfin_read_RTC_ISTAT() & WRITE_COMPLETE))
	47	if (!(bfin_read_RTC_ISTAT() & WRITE_PENDING))
	48	break;
	49	bfin_write_RTC_ISTAT(WRITE_COMPLETE);
	50	}
	51
b58d8b48 MF	52	/* Set the time. Get the time_in_secs which is the number of seconds since Jan 1970 and set the RTC registers
	53	* based on this value.
	54	*/
d1e23194	55	int rtc_set(struct rtc_time *tmp)
b58d8b48 MF	56	{
	57	unsigned long remain, days, hrs, mins, secs;
	58
	59	pr_stamp();
	60
	61	if (tmp == NULL) {
	62	puts("Error setting the date/time\n");
d1e23194	63	return -1;
b58d8b48 MF	64	}
b58d8b48 MF	65
3c879898	66	rtc_init();
b58d8b48 MF	67	wait_for_complete();
	68
	69	/* Calculate number of seconds this incoming time represents */
71420983	70	remain = rtc_mktime(tmp);
b58d8b48 MF	71
	72	/* Figure out how many days since epoch */
	73	days = remain / NUM_SECS_IN_DAY;
	74
	75	/* From the remaining secs, compute the hrs(0-23), mins(0-59) and secs(0-59) */
	76	remain = remain % NUM_SECS_IN_DAY;
	77	hrs = remain / NUM_SECS_IN_HR;
	78	remain = remain % NUM_SECS_IN_HR;
	79	mins = remain / NUM_SECS_IN_MIN;
	80	secs = remain % NUM_SECS_IN_MIN;
	81
	82	/* Encode these time values into our RTC_STAT register */
	83	bfin_write_RTC_STAT(SET_ALARM(days, hrs, mins, secs));
d1e23194 JCPV	84
d1e23194 JCPV	85	return 0;
b58d8b48 MF	86	}
	87
	88	/* Read the time from the RTC_STAT. time_in_seconds is seconds since Jan 1970 */
b73a19e1	89	int rtc_get(struct rtc_time *tmp)
b58d8b48 MF	90	{
	91	uint32_t cur_rtc_stat;
	92	int time_in_sec;
	93	int tm_sec, tm_min, tm_hr, tm_day;
	94
	95	pr_stamp();
	96
	97	if (tmp == NULL) {
	98	puts("Error getting the date/time\n");
b73a19e1	99	return -1;
b58d8b48 MF	100	}
b58d8b48 MF	101
3c879898	102	rtc_init();
b58d8b48 MF	103	wait_for_complete();
	104
	105	/* Read the RTC_STAT register */
	106	cur_rtc_stat = bfin_read_RTC_STAT();
	107
	108	/* Convert our encoded format into actual time values */
	109	tm_sec = (cur_rtc_stat & RTC_SEC) >> RTC_SEC_P;
	110	tm_min = (cur_rtc_stat & RTC_MIN) >> RTC_MIN_P;
	111	tm_hr = (cur_rtc_stat & RTC_HR ) >> RTC_HR_P;
	112	tm_day = (cur_rtc_stat & RTC_DAY) >> RTC_DAY_P;
	113
	114	/* Calculate the total number of seconds since epoch */
	115	time_in_sec = (tm_sec) + MIN_TO_SECS(tm_min) + HRS_TO_SECS(tm_hr) + DAYS_TO_SECS(tm_day);
9f9276c3	116	rtc_to_tm(time_in_sec, tmp);
b73a19e1 YT	117
b73a19e1 YT	118	return 0;
b58d8b48 MF	119	}
	120
	121	#endif