[people/ms/u-boot.git] / drivers / rtc / m41t11.c

/*
 * (C) Copyright 2002
 * Andrew May, Viasat Inc, amay@viasat.com
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * M41T11 Serial Access Timekeeper(R) SRAM
 * can you believe a trademark on that?
 */

/* #define DEBUG 1 */

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

/*
	I Don't have an example config file but this
	is what should be done.

#define CONFIG_RTC_M41T11 1
#define CONFIG_SYS_I2C_RTC_ADDR 0x68
#if 0
#define CONFIG_SYS_M41T11_EXT_CENTURY_DATA
#else
#define CONFIG_SYS_M41T11_BASE_YEAR 2000
#endif
*/

#if defined(CONFIG_SYS_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE)

/* ------------------------------------------------------------------------- */
/*
  these are simple defines for the chip local to here so they aren't too
  verbose
  DAY/DATE aren't nice but that is how they are on the data sheet
*/
#define RTC_SEC_ADDR       0x0
#define RTC_MIN_ADDR       0x1
#define RTC_HOUR_ADDR      0x2
#define RTC_DAY_ADDR       0x3
#define RTC_DATE_ADDR      0x4
#define RTC_MONTH_ADDR     0x5
#define RTC_YEARS_ADDR     0x6

#define RTC_REG_CNT        7

#define RTC_CONTROL_ADDR   0x7


#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA

#define REG_CNT            (RTC_REG_CNT+1)

/*
  you only get 00-99 for the year we will asume you
  want from the year 2000 if you don't set the config
*/
#ifndef CONFIG_SYS_M41T11_BASE_YEAR
#define CONFIG_SYS_M41T11_BASE_YEAR 2000
#endif

#else
/* we will store extra year info in byte 9*/
#define M41T11_YEAR_DATA   0x8
#define M41T11_YEAR_SIZE   1
#define REG_CNT            (RTC_REG_CNT+1+M41T11_YEAR_SIZE)
#endif

#define M41T11_STORAGE_SZ  (64-REG_CNT)

int rtc_get (struct rtc_time *tmp)
{
	int rel = 0;
	uchar data[RTC_REG_CNT];

	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT);

	if( data[RTC_SEC_ADDR] & 0x80 ){
		printf( "m41t11 RTC Clock stopped!!!\n" );
		rel = -1;
	}
	tmp->tm_sec  = bcd2bin (data[RTC_SEC_ADDR]  & 0x7F);
	tmp->tm_min  = bcd2bin (data[RTC_MIN_ADDR]  & 0x7F);
	tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F);
	tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F);
	tmp->tm_mon  = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F);
#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA
	tmp->tm_year = CONFIG_SYS_M41T11_BASE_YEAR
		+ bcd2bin(data[RTC_YEARS_ADDR])
		+ ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0);
#else
	{
		unsigned char cent;
		i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
		if( !(data[RTC_HOUR_ADDR] & 0x80) ){
			printf( "m41t11 RTC: cann't keep track of years without CEB set\n" );
			rel = -1;
		}
		if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){
			/*century flip store off new year*/
			cent += 1;
			i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
		}
		tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]);
	}
#endif
	tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR]  & 0x07);
	tmp->tm_yday = 0;
	tmp->tm_isdst= 0;

	debug ( "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;
}

int rtc_set (struct rtc_time *tmp)
{
	uchar data[RTC_REG_CNT];

	debug ( "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);

	data[RTC_SEC_ADDR]    = bin2bcd(tmp->tm_sec) &  0x7F;/*just in case*/
	data[RTC_MIN_ADDR]    = bin2bcd(tmp->tm_min);
	data[RTC_HOUR_ADDR]   = bin2bcd(tmp->tm_hour) & 0x3F;/*handle cent stuff later*/
	data[RTC_DATE_ADDR]   = bin2bcd(tmp->tm_mday) & 0x3F;
	data[RTC_MONTH_ADDR]  = bin2bcd(tmp->tm_mon);
	data[RTC_DAY_ADDR]    = bin2bcd(tmp->tm_wday) & 0x07;

	data[RTC_HOUR_ADDR]   |= 0x80;/*we will always use CEB*/

	data[RTC_YEARS_ADDR]  = bin2bcd(tmp->tm_year%100);/*same thing either way*/
#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA
	if( ((tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 200) ||
	    (tmp->tm_year < CONFIG_SYS_M41T11_BASE_YEAR) ){
		printf( "m41t11 RTC setting year out of range!!need recompile\n" );
	}
	data[RTC_HOUR_ADDR] |= (tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 100 ? 0x40 : 0;
#else
	{
		unsigned char cent;
		cent = tmp->tm_year ? tmp->tm_year / 100 : 0;
		data[RTC_HOUR_ADDR] |= (cent & 0x1) ? 0x40 : 0;
		i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
	}
#endif
	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT);

	return 0;
}

void rtc_reset (void)
{
	unsigned char val;
	/* clear all control & status registers */
	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1);
	val = val & 0x7F;/*make sure we are running*/
	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT);

	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1);
	val = val & 0x3F;/*turn off freq test keep calibration*/
	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1);
}
#endif
Commit	Line	Data
affae2bf WD	1	/*
	2	* (C) Copyright 2002
	3	* Andrew May, Viasat Inc, amay@viasat.com
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
affae2bf WD	6	*/
	7
	8	/*
	9	* M41T11 Serial Access Timekeeper(R) SRAM
	10	* can you believe a trademark on that?
	11	*/
	12
e6325153 WD	13	/* #define DEBUG 1 */
e6325153 WD	14
affae2bf WD	15	#include <common.h>
	16	#include <command.h>
	17	#include <rtc.h>
	18	#include <i2c.h>
	19
	20	/*
	21	I Don't have an example config file but this
	22	is what should be done.
	23
	24	#define CONFIG_RTC_M41T11 1
6d0f6bcf	25	#define CONFIG_SYS_I2C_RTC_ADDR 0x68
affae2bf	26	#if 0
6d0f6bcf	27	#define CONFIG_SYS_M41T11_EXT_CENTURY_DATA
affae2bf	28	#else
6d0f6bcf	29	#define CONFIG_SYS_M41T11_BASE_YEAR 2000
affae2bf WD	30	#endif
	31	*/
	32
6d0f6bcf	33	#if defined(CONFIG_SYS_I2C_RTC_ADDR) && defined(CONFIG_CMD_DATE)
affae2bf	34
affae2bf WD	35	/* ------------------------------------------------------------------------- */
	36	/*
	37	these are simple defines for the chip local to here so they aren't too
	38	verbose
	39	DAY/DATE aren't nice but that is how they are on the data sheet
	40	*/
	41	#define RTC_SEC_ADDR 0x0
	42	#define RTC_MIN_ADDR 0x1
	43	#define RTC_HOUR_ADDR 0x2
	44	#define RTC_DAY_ADDR 0x3
	45	#define RTC_DATE_ADDR 0x4
	46	#define RTC_MONTH_ADDR 0x5
	47	#define RTC_YEARS_ADDR 0x6
	48
	49	#define RTC_REG_CNT 7
	50
	51	#define RTC_CONTROL_ADDR 0x7
	52
	53
6d0f6bcf	54	#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA
affae2bf WD	55
	56	#define REG_CNT (RTC_REG_CNT+1)
	57
	58	/*
	59	you only get 00-99 for the year we will asume you
	60	want from the year 2000 if you don't set the config
	61	*/
6d0f6bcf JCPV	62	#ifndef CONFIG_SYS_M41T11_BASE_YEAR
6d0f6bcf JCPV	63	#define CONFIG_SYS_M41T11_BASE_YEAR 2000
affae2bf WD	64	#endif
	65
	66	#else
	67	/* we will store extra year info in byte 9*/
	68	#define M41T11_YEAR_DATA 0x8
	69	#define M41T11_YEAR_SIZE 1
	70	#define REG_CNT (RTC_REG_CNT+1+M41T11_YEAR_SIZE)
	71	#endif
	72
	73	#define M41T11_STORAGE_SZ (64-REG_CNT)
	74
b73a19e1	75	int rtc_get (struct rtc_time *tmp)
affae2bf	76	{
b73a19e1	77	int rel = 0;
8bde7f77	78	uchar data[RTC_REG_CNT];
affae2bf	79
6d0f6bcf	80	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT);
affae2bf	81
8bde7f77 WD	82	if( data[RTC_SEC_ADDR] & 0x80 ){
8bde7f77 WD	83	printf( "m41t11 RTC Clock stopped!!!\n" );
b73a19e1	84	rel = -1;
8bde7f77	85	}
affae2bf WD	86	tmp->tm_sec = bcd2bin (data[RTC_SEC_ADDR] & 0x7F);
	87	tmp->tm_min = bcd2bin (data[RTC_MIN_ADDR] & 0x7F);
	88	tmp->tm_hour = bcd2bin (data[RTC_HOUR_ADDR] & 0x3F);
	89	tmp->tm_mday = bcd2bin (data[RTC_DATE_ADDR] & 0x3F);
	90	tmp->tm_mon = bcd2bin (data[RTC_MONTH_ADDR]& 0x1F);
6d0f6bcf JCPV	91	#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA
6d0f6bcf JCPV	92	tmp->tm_year = CONFIG_SYS_M41T11_BASE_YEAR
8bde7f77 WD	93	+ bcd2bin(data[RTC_YEARS_ADDR])
8bde7f77 WD	94	+ ((data[RTC_HOUR_ADDR]&0x40) ? 100 : 0);
affae2bf	95	#else
8bde7f77 WD	96	{
8bde7f77 WD	97	unsigned char cent;
6d0f6bcf	98	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
8bde7f77 WD	99	if( !(data[RTC_HOUR_ADDR] & 0x80) ){
8bde7f77 WD	100	printf( "m41t11 RTC: cann't keep track of years without CEB set\n" );
b73a19e1	101	rel = -1;
8bde7f77 WD	102	}
	103	if( (cent & 0x1) != ((data[RTC_HOUR_ADDR]&0x40)>>7) ){
	104	/century flip store off new year/
	105	cent += 1;
6d0f6bcf	106	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
8bde7f77 WD	107	}
	108	tmp->tm_year =((int)cent*100)+bcd2bin(data[RTC_YEARS_ADDR]);
	109	}
affae2bf WD	110	#endif
	111	tmp->tm_wday = bcd2bin (data[RTC_DAY_ADDR] & 0x07);
	112	tmp->tm_yday = 0;
	113	tmp->tm_isdst= 0;
	114
	115	debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	116	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	117	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
b73a19e1 YT	118
b73a19e1 YT	119	return rel;
affae2bf WD	120	}
affae2bf WD	121
d1e23194	122	int rtc_set (struct rtc_time *tmp)
affae2bf	123	{
8bde7f77	124	uchar data[RTC_REG_CNT];
affae2bf WD	125
	126	debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	127	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	128	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	129
	130	data[RTC_SEC_ADDR] = bin2bcd(tmp->tm_sec) & 0x7F;/just in case/
	131	data[RTC_MIN_ADDR] = bin2bcd(tmp->tm_min);
	132	data[RTC_HOUR_ADDR] = bin2bcd(tmp->tm_hour) & 0x3F;/handle cent stuff later/
	133	data[RTC_DATE_ADDR] = bin2bcd(tmp->tm_mday) & 0x3F;
	134	data[RTC_MONTH_ADDR] = bin2bcd(tmp->tm_mon);
	135	data[RTC_DAY_ADDR] = bin2bcd(tmp->tm_wday) & 0x07;
	136
8bde7f77	137	data[RTC_HOUR_ADDR] \|= 0x80;/we will always use CEB/
affae2bf	138
8bde7f77	139	data[RTC_YEARS_ADDR] = bin2bcd(tmp->tm_year%100);/same thing either way/
6d0f6bcf JCPV	140	#ifndef CONFIG_SYS_M41T11_EXT_CENTURY_DATA
	141	if( ((tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 200) \|\|
	142	(tmp->tm_year < CONFIG_SYS_M41T11_BASE_YEAR) ){
8bde7f77 WD	143	printf( "m41t11 RTC setting year out of range!!need recompile\n" );
8bde7f77 WD	144	}
6d0f6bcf	145	data[RTC_HOUR_ADDR] \|= (tmp->tm_year - CONFIG_SYS_M41T11_BASE_YEAR) > 100 ? 0x40 : 0;
affae2bf	146	#else
8bde7f77 WD	147	{
	148	unsigned char cent;
	149	cent = tmp->tm_year ? tmp->tm_year / 100 : 0;
	150	data[RTC_HOUR_ADDR] \|= (cent & 0x1) ? 0x40 : 0;
6d0f6bcf	151	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, M41T11_YEAR_DATA, 1, &cent, M41T11_YEAR_SIZE);
8bde7f77	152	}
affae2bf	153	#endif
6d0f6bcf	154	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, data, RTC_REG_CNT);
d1e23194 JCPV	155
d1e23194 JCPV	156	return 0;
affae2bf WD	157	}
	158
	159	void rtc_reset (void)
	160	{
8bde7f77	161	unsigned char val;
affae2bf	162	/* clear all control & status registers */
6d0f6bcf	163	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, 1);
8bde7f77	164	val = val & 0x7F;/make sure we are running/
6d0f6bcf	165	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_SEC_ADDR, 1, &val, RTC_REG_CNT);
affae2bf	166
6d0f6bcf	167	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1);
8bde7f77	168	val = val & 0x3F;/turn off freq test keep calibration/
6d0f6bcf	169	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_CONTROL_ADDR, 1, &val, 1);
affae2bf	170	}
068b60a0	171	#endif