1/*
2 * Copyright (C) 2016 by NXP Semiconductors Inc.
3 * Date & Time support for PCF2127 RTC
4 */
5
6/*	#define	DEBUG	*/
7
8#include <command.h>
9#include <dm.h>
10#include <i2c.h>
11#include <log.h>
12#include <rtc.h>
13
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
24
25static int pcf2127_rtc_read(struct udevice *dev, uint offset, u8 *buffer, uint len)
26{
27	struct dm_i2c_chip *chip = dev_get_parent_plat(dev);
28	struct i2c_msg msg;
29	int ret;
30
31	/* Set the address of the start register to be read */
32	ret = dm_i2c_write(dev, offset, NULL, 0);
33	if (ret < 0)
34		return ret;
35
36	/* Read register's data */
37	msg.addr = chip->chip_addr;
38	msg.flags |= I2C_M_RD;
39	msg.len = len;
40	msg.buf = buffer;
41
42	return dm_i2c_xfer(dev, &msg, 1);
43}
44
45static int pcf2127_rtc_write(struct udevice *dev, uint offset,
46			     const u8 *buffer, uint len)
47{
48	return dm_i2c_write(dev, offset, buffer, len);
49}
50
51static int pcf2127_rtc_set(struct udevice *dev, const struct rtc_time *tm)
52{
53	uchar buf[7] = {0};
54	int i = 0, ret;
55
56	/* hours, minutes and seconds */
57	buf[i++] = bin2bcd(tm->tm_sec);
58	buf[i++] = bin2bcd(tm->tm_min);
59	buf[i++] = bin2bcd(tm->tm_hour);
60	buf[i++] = bin2bcd(tm->tm_mday);
61	buf[i++] = tm->tm_wday & 0x07;
62
63	/* month, 1 - 12 */
64	buf[i++] = bin2bcd(tm->tm_mon);
65
66	/* year */
67	buf[i++] = bin2bcd(tm->tm_year % 100);
68
69	/* write register's data */
70	ret = dm_i2c_write(dev, PCF2127_REG_SC, buf, i);
71
72	return ret;
73}
74
75static int pcf2127_rtc_get(struct udevice *dev, struct rtc_time *tm)
76{
77	int ret = 0;
78	uchar buf[10] = { PCF2127_REG_CTRL1 };
79
80	ret = pcf2127_rtc_read(dev, PCF2127_REG_CTRL1, buf, sizeof(buf));
81	if (ret < 0)
82		return ret;
83
84	if (buf[PCF2127_REG_CTRL3] & 0x04)
85		puts("### Warning: RTC Low Voltage - date/time not reliable\n");
86
87	tm->tm_sec  = bcd2bin(buf[PCF2127_REG_SC] & 0x7F);
88	tm->tm_min  = bcd2bin(buf[PCF2127_REG_MN] & 0x7F);
89	tm->tm_hour = bcd2bin(buf[PCF2127_REG_HR] & 0x3F);
90	tm->tm_mday = bcd2bin(buf[PCF2127_REG_DM] & 0x3F);
91	tm->tm_mon  = bcd2bin(buf[PCF2127_REG_MO] & 0x1F);
92	tm->tm_year = bcd2bin(buf[PCF2127_REG_YR]) + 1900;
93	if (tm->tm_year < 1970)
94		tm->tm_year += 100;	/* assume we are in 1970...2069 */
95	tm->tm_wday = buf[PCF2127_REG_DW] & 0x07;
96	tm->tm_yday = 0;
97	tm->tm_isdst = 0;
98
99	debug("Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
100	      tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday,
101	      tm->tm_hour, tm->tm_min, tm->tm_sec);
102
103	return ret;
104}
105
106static int pcf2127_rtc_reset(struct udevice *dev)
107{
108	/*Doing nothing here*/
109
110	return 0;
111}
112
113static const struct rtc_ops pcf2127_rtc_ops = {
114	.get = pcf2127_rtc_get,
115	.set = pcf2127_rtc_set,
116	.reset = pcf2127_rtc_reset,
117	.read = pcf2127_rtc_read,
118	.write = pcf2127_rtc_write,
119};
120
121static const struct udevice_id pcf2127_rtc_ids[] = {
122	{ .compatible = "nxp,pcf2127" },
123	{ .compatible = "nxp,pcf2129" },
124	{ .compatible = "nxp,pca2129" },
125	{ }
126};
127
128U_BOOT_DRIVER(rtc_pcf2127) = {
129	.name	= "rtc-pcf2127",
130	.id	= UCLASS_RTC,
131	.of_match = pcf2127_rtc_ids,
132	.ops	= &pcf2127_rtc_ops,
133};
134