[J-u-boot.git] / drivers / rtc / rx8025.c

/*
 * (C) Copyright 2007
 * Matthias Fuchs, esd gmbh, [email protected].
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

/*
 * Epson RX8025 RTC driver.
 */

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

#if defined(CONFIG_CMD_DATE)

/*---------------------------------------------------------------------*/
#undef DEBUG_RTC

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

#ifndef CONFIG_SYS_I2C_RTC_ADDR
# define CONFIG_SYS_I2C_RTC_ADDR	0x32
#endif

/*
 * RTC register addresses
 */
#define RTC_SEC_REG_ADDR	0x00
#define RTC_MIN_REG_ADDR	0x01
#define RTC_HR_REG_ADDR		0x02
#define RTC_DAY_REG_ADDR	0x03
#define RTC_DATE_REG_ADDR	0x04
#define RTC_MON_REG_ADDR	0x05
#define RTC_YR_REG_ADDR		0x06

#define RTC_CTL1_REG_ADDR	0x0e
#define RTC_CTL2_REG_ADDR	0x0f

/*
 * Control register 1 bits
 */
#define RTC_CTL1_BIT_2412	0x20

/*
 * Control register 2 bits
 */
#define RTC_CTL2_BIT_PON	0x10
#define RTC_CTL2_BIT_VDET	0x40
#define RTC_CTL2_BIT_XST	0x20
#define RTC_CTL2_BIT_VDSL	0x80

/*
 * Note: the RX8025 I2C RTC requires register
 * reads and write to consist of a single bus
 * cycle. It is not allowed to write the register
 * address in a first cycle that is terminated by
 * a STOP condition. The chips needs a 'restart'
 * sequence (start sequence without a prior stop).
 * This driver has been written for a 4xx board.
 * U-Boot's 4xx i2c driver is currently not capable
 * to generate such cycles to some work arounds
 * are used.
 */

/* static uchar rtc_read (uchar reg); */
#define rtc_read(reg) buf[((reg) + 1) & 0xf]

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, ctl2;
	uchar buf[16];

	if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16))
		printf("Error reading from RTC\n");

	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\n",
		year, mon, mday, wday, hour, min, sec);

	/* dump status */
	ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
	if (ctl2 & RTC_CTL2_BIT_PON) {
		printf("RTC: power-on detected\n");
		rel = -1;
	}

	if (ctl2 & RTC_CTL2_BIT_VDET) {
		printf("RTC: voltage drop detected\n");
		rel = -1;
	}

	if (!(ctl2 & RTC_CTL2_BIT_XST)) {
		printf("RTC: oscillator stop detected\n");
		rel = -1;
	}

	tmp->tm_sec  = bcd2bin (sec & 0x7F);
	tmp->tm_min  = bcd2bin (min & 0x7F);
	if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412)
		tmp->tm_hour = bcd2bin (hour & 0x3F);
	else
		tmp->tm_hour = bcd2bin (hour & 0x1F) % 12 +
			       ((hour & 0x20) ? 12 : 0);
	tmp->tm_mday = bcd2bin (mday & 0x3F);
	tmp->tm_mon  = bcd2bin (mon & 0x1F);
	tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 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);

	if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
		printf("WARNING: year should be between 1970 and 2069!\n");

	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));
	rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
	rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));

	rtc_write (RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);

	return 0;
}

/*
 * Reset the RTC. We setting the date back to 1970-01-01.
 */
void rtc_reset (void)
{
	struct rtc_time tmp;
	uchar buf[16];
	uchar ctl2;

	if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0,    0,   buf, 16))
		printf("Error reading from RTC\n");

	ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
	ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
	ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
	rtc_write (RTC_CTL2_REG_ADDR, ctl2);

	tmp.tm_year = 1970;
	tmp.tm_mon = 1;
	tmp.tm_mday= 1;
	tmp.tm_hour = 0;
	tmp.tm_min = 0;
	tmp.tm_sec = 0;

	rtc_set(&tmp);

	printf ( "RTC:   %4d-%02d-%02d %2d:%02d:%02d UTC\n",
		tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
		tmp.tm_hour, tmp.tm_min, tmp.tm_sec);

	return;
}

/*
 * Helper functions
 */
static void rtc_write (uchar reg, uchar val)
{
	uchar buf[2];
	buf[0] = reg << 4;
	buf[1] = val;
	if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 2) != 0)
		printf("Error writing to RTC\n");

}

#endif /* CONFIG_RTC_RX8025 && CONFIG_CMD_DATE */
Commit	Line	Data
95c6bc7d MF	1	/*
	2	* (C) Copyright 2007
	3	* Matthias Fuchs, esd gmbh, [email protected].
	4	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
95c6bc7d MF	6	*/
	7
	8	/*
	9	* Epson RX8025 RTC driver.
	10	*/
	11
	12	#include <common.h>
	13	#include <command.h>
	14	#include <rtc.h>
	15	#include <i2c.h>
	16
871c18dd	17	#if defined(CONFIG_CMD_DATE)
95c6bc7d MF	18
	19	/---------------------------------------------------------------------/
	20	#undef DEBUG_RTC
	21
	22	#ifdef DEBUG_RTC
	23	#define DEBUGR(fmt,args...) printf(fmt ,##args)
	24	#else
	25	#define DEBUGR(fmt,args...)
	26	#endif
	27	/---------------------------------------------------------------------/
	28
6d0f6bcf JCPV	29	#ifndef CONFIG_SYS_I2C_RTC_ADDR
6d0f6bcf JCPV	30	# define CONFIG_SYS_I2C_RTC_ADDR 0x32
95c6bc7d MF	31	#endif
	32
	33	/*
	34	* RTC register addresses
	35	*/
	36	#define RTC_SEC_REG_ADDR 0x00
	37	#define RTC_MIN_REG_ADDR 0x01
	38	#define RTC_HR_REG_ADDR 0x02
	39	#define RTC_DAY_REG_ADDR 0x03
	40	#define RTC_DATE_REG_ADDR 0x04
	41	#define RTC_MON_REG_ADDR 0x05
	42	#define RTC_YR_REG_ADDR 0x06
	43
	44	#define RTC_CTL1_REG_ADDR 0x0e
	45	#define RTC_CTL2_REG_ADDR 0x0f
	46
	47	/*
	48	* Control register 1 bits
	49	*/
	50	#define RTC_CTL1_BIT_2412 0x20
	51
	52	/*
	53	* Control register 2 bits
	54	*/
	55	#define RTC_CTL2_BIT_PON 0x10
	56	#define RTC_CTL2_BIT_VDET 0x40
	57	#define RTC_CTL2_BIT_XST 0x20
	58	#define RTC_CTL2_BIT_VDSL 0x80
	59
	60	/*
	61	* Note: the RX8025 I2C RTC requires register
	62	* reads and write to consist of a single bus
	63	* cycle. It is not allowed to write the register
	64	* address in a first cycle that is terminated by
	65	* a STOP condition. The chips needs a 'restart'
	66	* sequence (start sequence without a prior stop).
	67	* This driver has been written for a 4xx board.
	68	* U-Boot's 4xx i2c driver is currently not capable
	69	* to generate such cycles to some work arounds
	70	* are used.
	71	*/
	72
	73	/* static uchar rtc_read (uchar reg); */
	74	#define rtc_read(reg) buf[((reg) + 1) & 0xf]
	75
	76	static void rtc_write (uchar reg, uchar val);
95c6bc7d MF	77
	78	/*
	79	* Get the current time from the RTC
	80	*/
b73a19e1	81	int rtc_get (struct rtc_time *tmp)
95c6bc7d	82	{
b73a19e1	83	int rel = 0;
95c6bc7d MF	84	uchar sec, min, hour, mday, wday, mon, year, ctl2;
	85	uchar buf[16];
	86
6d0f6bcf	87	if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16))
95c6bc7d MF	88	printf("Error reading from RTC\n");
	89
	90	sec = rtc_read(RTC_SEC_REG_ADDR);
	91	min = rtc_read(RTC_MIN_REG_ADDR);
	92	hour = rtc_read(RTC_HR_REG_ADDR);
	93	wday = rtc_read(RTC_DAY_REG_ADDR);
	94	mday = rtc_read(RTC_DATE_REG_ADDR);
	95	mon = rtc_read(RTC_MON_REG_ADDR);
	96	year = rtc_read(RTC_YR_REG_ADDR);
	97
	98	DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
	99	"hr: %02x min: %02x sec: %02x\n",
	100	year, mon, mday, wday, hour, min, sec);
	101
	102	/* dump status */
	103	ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
b73a19e1	104	if (ctl2 & RTC_CTL2_BIT_PON) {
95c6bc7d	105	printf("RTC: power-on detected\n");
b73a19e1 YT	106	rel = -1;
b73a19e1 YT	107	}
95c6bc7d	108
b73a19e1	109	if (ctl2 & RTC_CTL2_BIT_VDET) {
95c6bc7d	110	printf("RTC: voltage drop detected\n");
b73a19e1 YT	111	rel = -1;
b73a19e1 YT	112	}
95c6bc7d	113
b73a19e1	114	if (!(ctl2 & RTC_CTL2_BIT_XST)) {
95c6bc7d	115	printf("RTC: oscillator stop detected\n");
b73a19e1 YT	116	rel = -1;
b73a19e1 YT	117	}
95c6bc7d MF	118
	119	tmp->tm_sec = bcd2bin (sec & 0x7F);
	120	tmp->tm_min = bcd2bin (min & 0x7F);
5875d358 YT	121	if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412)
	122	tmp->tm_hour = bcd2bin (hour & 0x3F);
	123	else
	124	tmp->tm_hour = bcd2bin (hour & 0x1F) % 12 +
	125	((hour & 0x20) ? 12 : 0);
95c6bc7d MF	126	tmp->tm_mday = bcd2bin (mday & 0x3F);
	127	tmp->tm_mon = bcd2bin (mon & 0x1F);
	128	tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
	129	tmp->tm_wday = bcd2bin (wday & 0x07);
	130	tmp->tm_yday = 0;
	131	tmp->tm_isdst= 0;
	132
	133	DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	134	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	135	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
b73a19e1 YT	136
b73a19e1 YT	137	return rel;
95c6bc7d MF	138	}
95c6bc7d MF	139
95c6bc7d MF	140	/*
	141	* Set the RTC
	142	*/
d1e23194	143	int rtc_set (struct rtc_time *tmp)
95c6bc7d MF	144	{
	145	DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	146	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	147	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	148
	149	if (tmp->tm_year < 1970 \|\| tmp->tm_year > 2069)
	150	printf("WARNING: year should be between 1970 and 2069!\n");
	151
	152	rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
	153	rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
	154	rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
	155	rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
	156	rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
	157	rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
	158	rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
	159
	160	rtc_write (RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);
d1e23194 JCPV	161
d1e23194 JCPV	162	return 0;
95c6bc7d MF	163	}
95c6bc7d MF	164
95c6bc7d MF	165	/*
	166	* Reset the RTC. We setting the date back to 1970-01-01.
	167	*/
	168	void rtc_reset (void)
	169	{
	170	struct rtc_time tmp;
	171	uchar buf[16];
	172	uchar ctl2;
	173
6d0f6bcf	174	if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16))
95c6bc7d MF	175	printf("Error reading from RTC\n");
	176
	177	ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
	178	ctl2 &= ~(RTC_CTL2_BIT_PON \| RTC_CTL2_BIT_VDET);
	179	ctl2 \|= RTC_CTL2_BIT_XST \| RTC_CTL2_BIT_VDSL;
	180	rtc_write (RTC_CTL2_REG_ADDR, ctl2);
	181
	182	tmp.tm_year = 1970;
	183	tmp.tm_mon = 1;
	184	tmp.tm_mday= 1;
	185	tmp.tm_hour = 0;
	186	tmp.tm_min = 0;
	187	tmp.tm_sec = 0;
	188
	189	rtc_set(&tmp);
	190
	191	printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
	192	tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
	193	tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
	194
	195	return;
	196	}
	197
95c6bc7d MF	198	/*
	199	* Helper functions
	200	*/
	201	static void rtc_write (uchar reg, uchar val)
	202	{
	203	uchar buf[2];
	204	buf[0] = reg << 4;
	205	buf[1] = val;
6d0f6bcf	206	if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 2) != 0)
95c6bc7d MF	207	printf("Error writing to RTC\n");
	208
	209	}
	210
1b769881	211	#endif /* CONFIG_RTC_RX8025 && CONFIG_CMD_DATE */