[people/ms/u-boot.git] / drivers / rtc / isl1208.c

/*
 * (C) Copyright 2008
 * Tor Krill, Excito Elektronik i Skåne , tor@excito.com
 *
 * Modelled after the ds1337 driver
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * Date & Time support (no alarms) for Intersil
 * ISL1208 Real Time Clock (RTC).
 */

#include <common.h>
#include <command.h>
#include <rtc.h>
#include <i2c.h>

/*---------------------------------------------------------------------*/
#ifdef DEBUG_RTC
#define DEBUGR(fmt,args...) printf(fmt ,##args)
#else
#define DEBUGR(fmt,args...)
#endif
/*---------------------------------------------------------------------*/

/*
 * RTC register addresses
 */

#define RTC_SEC_REG_ADDR	0x0
#define RTC_MIN_REG_ADDR	0x1
#define RTC_HR_REG_ADDR		0x2
#define RTC_DATE_REG_ADDR	0x3
#define RTC_MON_REG_ADDR	0x4
#define RTC_YR_REG_ADDR		0x5
#define RTC_DAY_REG_ADDR	0x6
#define RTC_STAT_REG_ADDR	0x7
/*
 * RTC control register bits
 */

/*
 * RTC status register bits
 */
#define RTC_STAT_BIT_ARST	0x80	/* AUTO RESET ENABLE BIT */
#define RTC_STAT_BIT_XTOSCB	0x40	/* CRYSTAL OSCILLATOR ENABLE BIT */
#define RTC_STAT_BIT_WRTC	0x10	/* WRITE RTC ENABLE BIT */
#define RTC_STAT_BIT_ALM	0x04	/* ALARM BIT */
#define RTC_STAT_BIT_BAT	0x02	/* BATTERY BIT */
#define RTC_STAT_BIT_RTCF	0x01	/* REAL TIME CLOCK FAIL BIT */

static uchar rtc_read (uchar reg);
static void rtc_write (uchar reg, uchar val);

/*
 * Get the current time from the RTC
 */

int rtc_get (struct rtc_time *tmp)
{
	int rel = 0;
	uchar sec, min, hour, mday, wday, mon, year, status;

	status = rtc_read (RTC_STAT_REG_ADDR);
	sec = rtc_read (RTC_SEC_REG_ADDR);
	min = rtc_read (RTC_MIN_REG_ADDR);
	hour = rtc_read (RTC_HR_REG_ADDR);
	wday = rtc_read (RTC_DAY_REG_ADDR);
	mday = rtc_read (RTC_DATE_REG_ADDR);
	mon = rtc_read (RTC_MON_REG_ADDR);
	year = rtc_read (RTC_YR_REG_ADDR);

	DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
		"hr: %02x min: %02x sec: %02x status: %02x\n",
		year, mon, mday, wday, hour, min, sec, status);

	if (status & RTC_STAT_BIT_RTCF) {
		printf ("### Warning: RTC oscillator has stopped\n");
		rtc_write(RTC_STAT_REG_ADDR,
			rtc_read(RTC_STAT_REG_ADDR) &~ (RTC_STAT_BIT_BAT|RTC_STAT_BIT_RTCF));
		rel = -1;
	}

	tmp->tm_sec  = bcd2bin (sec & 0x7F);
	tmp->tm_min  = bcd2bin (min & 0x7F);
	tmp->tm_hour = bcd2bin (hour & 0x3F);
	tmp->tm_mday = bcd2bin (mday & 0x3F);
	tmp->tm_mon  = bcd2bin (mon & 0x1F);
	tmp->tm_year = bcd2bin (year)+2000;
	tmp->tm_wday = bcd2bin (wday & 0x07);
	tmp->tm_yday = 0;
	tmp->tm_isdst= 0;

	DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);

	return rel;
}

/*
 * Set the RTC
 */
int rtc_set (struct rtc_time *tmp)
{
	DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);

	/* enable write */
	rtc_write(RTC_STAT_REG_ADDR,
		rtc_read(RTC_STAT_REG_ADDR) | RTC_STAT_BIT_WRTC);

	rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
	rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
	rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
	rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
	rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour) | 0x80 ); /* 24h clock */
	rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
	rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));

	/* disable write */
	rtc_write(RTC_STAT_REG_ADDR,
		rtc_read(RTC_STAT_REG_ADDR) & ~RTC_STAT_BIT_WRTC);

	return 0;
}

void rtc_reset (void)
{
}

/*
 * Helper functions
 */

static uchar rtc_read (uchar reg)
{
	return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
}

static void rtc_write (uchar reg, uchar val)
{
	i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
}
Commit	Line	Data
9536dfcc TK	1	/*
	2	* (C) Copyright 2008
	3	* Tor Krill, Excito Elektronik i Skåne , tor@excito.com
	4	*
	5	* Modelled after the ds1337 driver
	6	*
1a459660	7	* SPDX-License-Identifier: GPL-2.0+
9536dfcc TK	8	*/
	9
	10	/*
	11	* Date & Time support (no alarms) for Intersil
	12	* ISL1208 Real Time Clock (RTC).
	13	*/
	14
	15	#include <common.h>
	16	#include <command.h>
	17	#include <rtc.h>
	18	#include <i2c.h>
	19
	20	/---------------------------------------------------------------------/
	21	#ifdef DEBUG_RTC
	22	#define DEBUGR(fmt,args...) printf(fmt ,##args)
	23	#else
	24	#define DEBUGR(fmt,args...)
	25	#endif
	26	/---------------------------------------------------------------------/
	27
	28	/*
	29	* RTC register addresses
	30	*/
	31
	32	#define RTC_SEC_REG_ADDR 0x0
	33	#define RTC_MIN_REG_ADDR 0x1
	34	#define RTC_HR_REG_ADDR 0x2
	35	#define RTC_DATE_REG_ADDR 0x3
	36	#define RTC_MON_REG_ADDR 0x4
	37	#define RTC_YR_REG_ADDR 0x5
	38	#define RTC_DAY_REG_ADDR 0x6
	39	#define RTC_STAT_REG_ADDR 0x7
	40	/*
	41	* RTC control register bits
	42	*/
	43
	44	/*
	45	* RTC status register bits
	46	*/
	47	#define RTC_STAT_BIT_ARST 0x80 /* AUTO RESET ENABLE BIT */
	48	#define RTC_STAT_BIT_XTOSCB 0x40 /* CRYSTAL OSCILLATOR ENABLE BIT */
	49	#define RTC_STAT_BIT_WRTC 0x10 /* WRITE RTC ENABLE BIT */
	50	#define RTC_STAT_BIT_ALM 0x04 /* ALARM BIT */
	51	#define RTC_STAT_BIT_BAT 0x02 /* BATTERY BIT */
	52	#define RTC_STAT_BIT_RTCF 0x01 /* REAL TIME CLOCK FAIL BIT */
	53
	54	static uchar rtc_read (uchar reg);
	55	static void rtc_write (uchar reg, uchar val);
9536dfcc TK	56
	57	/*
	58	* Get the current time from the RTC
	59	*/
	60
b73a19e1	61	int rtc_get (struct rtc_time *tmp)
9536dfcc	62	{
b73a19e1	63	int rel = 0;
9536dfcc TK	64	uchar sec, min, hour, mday, wday, mon, year, status;
	65
	66	status = rtc_read (RTC_STAT_REG_ADDR);
	67	sec = rtc_read (RTC_SEC_REG_ADDR);
	68	min = rtc_read (RTC_MIN_REG_ADDR);
	69	hour = rtc_read (RTC_HR_REG_ADDR);
	70	wday = rtc_read (RTC_DAY_REG_ADDR);
	71	mday = rtc_read (RTC_DATE_REG_ADDR);
	72	mon = rtc_read (RTC_MON_REG_ADDR);
	73	year = rtc_read (RTC_YR_REG_ADDR);
	74
	75	DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
	76	"hr: %02x min: %02x sec: %02x status: %02x\n",
	77	year, mon, mday, wday, hour, min, sec, status);
	78
	79	if (status & RTC_STAT_BIT_RTCF) {
	80	printf ("### Warning: RTC oscillator has stopped\n");
	81	rtc_write(RTC_STAT_REG_ADDR,
	82	rtc_read(RTC_STAT_REG_ADDR) &~ (RTC_STAT_BIT_BAT\|RTC_STAT_BIT_RTCF));
b73a19e1	83	rel = -1;
9536dfcc TK	84	}
	85
	86	tmp->tm_sec = bcd2bin (sec & 0x7F);
	87	tmp->tm_min = bcd2bin (min & 0x7F);
	88	tmp->tm_hour = bcd2bin (hour & 0x3F);
	89	tmp->tm_mday = bcd2bin (mday & 0x3F);
	90	tmp->tm_mon = bcd2bin (mon & 0x1F);
	91	tmp->tm_year = bcd2bin (year)+2000;
	92	tmp->tm_wday = bcd2bin (wday & 0x07);
	93	tmp->tm_yday = 0;
	94	tmp->tm_isdst= 0;
	95
	96	DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	97	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	98	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
b73a19e1 YT	99
b73a19e1 YT	100	return rel;
9536dfcc TK	101	}
	102
	103	/*
	104	* Set the RTC
	105	*/
d1e23194	106	int rtc_set (struct rtc_time *tmp)
9536dfcc TK	107	{
	108	DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	109	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	110	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	111
	112	/* enable write */
	113	rtc_write(RTC_STAT_REG_ADDR,
	114	rtc_read(RTC_STAT_REG_ADDR) \| RTC_STAT_BIT_WRTC);
	115
	116	rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
	117	rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
	118	rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
	119	rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
	120	rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour) \| 0x80 ); /* 24h clock */
	121	rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
	122	rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
	123
	124	/* disable write */
	125	rtc_write(RTC_STAT_REG_ADDR,
	126	rtc_read(RTC_STAT_REG_ADDR) & ~RTC_STAT_BIT_WRTC);
d1e23194 JCPV	127
d1e23194 JCPV	128	return 0;
9536dfcc TK	129	}
	130
	131	void rtc_reset (void)
	132	{
	133	}
	134
	135	/*
	136	* Helper functions
	137	*/
	138
	139	static uchar rtc_read (uchar reg)
	140	{
6d0f6bcf	141	return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
9536dfcc TK	142	}
	143
	144	static void rtc_write (uchar reg, uchar val)
	145	{
6d0f6bcf	146	i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
9536dfcc	147	}