[people/ms/u-boot.git] / drivers / rtc / pcf2127.c

/*
 * Copyright (C) 2016 by NXP Semiconductors Inc.
 * Date & Time support for PCF2127 RTC
 */

/*	#define	DEBUG	*/

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

#define PCF2127_REG_CTRL1	0x00
#define PCF2127_REG_CTRL2	0x01
#define PCF2127_REG_CTRL3	0x02
#define PCF2127_REG_SC		0x03
#define PCF2127_REG_MN		0x04
#define PCF2127_REG_HR		0x05
#define PCF2127_REG_DM		0x06
#define PCF2127_REG_DW		0x07
#define PCF2127_REG_MO		0x08
#define PCF2127_REG_YR		0x09

static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
{
	uchar buf[8];
	int i = 0, ret;

	/* start register address */
	buf[i++] = PCF2127_REG_SC;

	/* hours, minutes and seconds */
	buf[i++] = bin2bcd(tm->tm_sec);
	buf[i++] = bin2bcd(tm->tm_min);
	buf[i++] = bin2bcd(tm->tm_hour);
	buf[i++] = bin2bcd(tm->tm_mday);
	buf[i++] = tm->tm_wday & 0x07;

	/* month, 1 - 12 */
	buf[i++] = bin2bcd(tm->tm_mon + 1);

	/* year */
	buf[i++] = bin2bcd(tm->tm_year % 100);

	/* write register's data */
	ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));

	return ret;
}

static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
{
	int ret = 0;
	uchar buf[10] = { PCF2127_REG_CTRL1 };

	ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1);
	if (ret < 0)
		return ret;
	ret = dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
	if (ret < 0)
		return ret;

	if (buf[PCF2127_REG_CTRL3] & 0x04)
		puts("### Warning: RTC Low Voltage - date/time not reliable\n");

	tm->tm_sec  = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
	tm->tm_min  = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
	tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
	tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
	tm->tm_mon  = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1;
	tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
	if (tm->tm_year < 1970)
		tm->tm_year += 100;	/* assume we are in 1970...2069 */
	tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
	tm->tm_yday = 0;
	tm->tm_isdst = 0;

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

	return ret;
}

static int pcf2127_rtc_reset(struct udevice *dev)
{
	/*Doing nothing here*/

	return 0;
}

static const struct rtc_ops pcf2127_rtc_ops = {
	.get = pcf2127_rtc_get,
	.set = pcf2127_rtc_set,
	.reset = pcf2127_rtc_reset,
};

static const struct udevice_id pcf2127_rtc_ids[] = {
	{ .compatible = "pcf2127-rtc" },
	{ }
};

U_BOOT_DRIVER(rtc_pcf2127) = {
	.name	= "rtc-pcf2127",
	.id	= UCLASS_RTC,
	.of_match = pcf2127_rtc_ids,
	.ops	= &pcf2127_rtc_ops,
};
Commit	Line	Data
8f3a8428 MY	1	/*
	2	* Copyright (C) 2016 by NXP Semiconductors Inc.
	3	* Date & Time support for PCF2127 RTC
	4	*/
	5
	6	/* #define DEBUG */
	7
	8	#include <common.h>
	9	#include <command.h>
	10	#include <dm.h>
	11	#include <i2c.h>
	12	#include <rtc.h>
	13
45a0194b MY	14	#define PCF2127_REG_CTRL1 0x00
	15	#define PCF2127_REG_CTRL2 0x01
	16	#define PCF2127_REG_CTRL3 0x02
	17	#define PCF2127_REG_SC 0x03
	18	#define PCF2127_REG_MN 0x04
	19	#define PCF2127_REG_HR 0x05
	20	#define PCF2127_REG_DM 0x06
	21	#define PCF2127_REG_DW 0x07
	22	#define PCF2127_REG_MO 0x08
	23	#define PCF2127_REG_YR 0x09
8f3a8428 MY	24
	25	static int pcf2127_rtc_set(struct udevice dev, const struct rtc_time tm)
	26	{
	27	uchar buf[8];
45a0194b	28	int i = 0, ret;
8f3a8428 MY	29
	30	/* start register address */
	31	buf[i++] = PCF2127_REG_SC;
	32
	33	/* hours, minutes and seconds */
	34	buf[i++] = bin2bcd(tm->tm_sec);
	35	buf[i++] = bin2bcd(tm->tm_min);
	36	buf[i++] = bin2bcd(tm->tm_hour);
	37	buf[i++] = bin2bcd(tm->tm_mday);
	38	buf[i++] = tm->tm_wday & 0x07;
	39
	40	/* month, 1 - 12 */
	41	buf[i++] = bin2bcd(tm->tm_mon + 1);
	42
	43	/* year */
	44	buf[i++] = bin2bcd(tm->tm_year % 100);
	45
	46	/* write register's data */
45a0194b	47	ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
8f3a8428	48
45a0194b	49	return ret;
8f3a8428 MY	50	}
	51
	52	static int pcf2127_rtc_get(struct udevice dev, struct rtc_time tm)
	53	{
45a0194b	54	int ret = 0;
8f3a8428 MY	55	uchar buf[10] = { PCF2127_REG_CTRL1 };
8f3a8428 MY	56
45a0194b MY	57	ret = dm_i2c_write(dev, PCF2127_REG_CTRL1, buf, 1);
	58	if (ret < 0)
	59	return ret;
	60	ret = dm_i2c_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
	61	if (ret < 0)
	62	return ret;
8f3a8428 MY	63
	64	if (buf[PCF2127_REG_CTRL3] & 0x04)
	65	puts("### Warning: RTC Low Voltage - date/time not reliable\n");
	66
	67	tm->tm_sec = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
	68	tm->tm_min = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
	69	tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
	70	tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
	71	tm->tm_mon = bcd2bin(buf[PCF2127_REG_MO] & 0x1F) - 1;
	72	tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
	73	if (tm->tm_year < 1970)
	74	tm->tm_year += 100; /* assume we are in 1970...2069 */
	75	tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
	76	tm->tm_yday = 0;
	77	tm->tm_isdst = 0;
	78
	79	debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	80	tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
	81	tm->tm_hour, tm->tm_min, tm->tm_sec);
	82
45a0194b	83	return ret;
8f3a8428 MY	84	}
	85
	86	static int pcf2127_rtc_reset(struct udevice *dev)
	87	{
	88	/Doing nothing here/
45a0194b	89
8f3a8428 MY	90	return 0;
	91	}
	92
	93	static const struct rtc_ops pcf2127_rtc_ops = {
	94	.get = pcf2127_rtc_get,
	95	.set = pcf2127_rtc_set,
	96	.reset = pcf2127_rtc_reset,
	97	};
	98
	99	static const struct udevice_id pcf2127_rtc_ids[] = {
	100	{ .compatible = "pcf2127-rtc" },
	101	{ }
	102	};
	103
	104	U_BOOT_DRIVER(rtc_pcf2127) = {
	105	.name = "rtc-pcf2127",
	106	.id = UCLASS_RTC,
	107	.of_match = pcf2127_rtc_ids,
	108	.ops = &pcf2127_rtc_ops,
	109	};