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Matthias Fuchs95c6bc72007-12-27 16:55:17 +01001/*
2 * (C) Copyright 2007
3 * Matthias Fuchs, esd gmbh, matthias.fuchs@esd-electronics.com.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24/*
25 * Epson RX8025 RTC driver.
26 */
27
28#include <common.h>
29#include <command.h>
30#include <rtc.h>
31#include <i2c.h>
32
33#if defined(CONFIG_RTC_RX8025) && defined(CONFIG_CMD_DATE)
34
35/*---------------------------------------------------------------------*/
36#undef DEBUG_RTC
37
38#ifdef DEBUG_RTC
39#define DEBUGR(fmt,args...) printf(fmt ,##args)
40#else
41#define DEBUGR(fmt,args...)
42#endif
43/*---------------------------------------------------------------------*/
44
45#ifndef CFG_I2C_RTC_ADDR
46# define CFG_I2C_RTC_ADDR 0x32
47#endif
48
49/*
50 * RTC register addresses
51 */
52#define RTC_SEC_REG_ADDR 0x00
53#define RTC_MIN_REG_ADDR 0x01
54#define RTC_HR_REG_ADDR 0x02
55#define RTC_DAY_REG_ADDR 0x03
56#define RTC_DATE_REG_ADDR 0x04
57#define RTC_MON_REG_ADDR 0x05
58#define RTC_YR_REG_ADDR 0x06
59
60#define RTC_CTL1_REG_ADDR 0x0e
61#define RTC_CTL2_REG_ADDR 0x0f
62
63/*
64 * Control register 1 bits
65 */
66#define RTC_CTL1_BIT_2412 0x20
67
68/*
69 * Control register 2 bits
70 */
71#define RTC_CTL2_BIT_PON 0x10
72#define RTC_CTL2_BIT_VDET 0x40
73#define RTC_CTL2_BIT_XST 0x20
74#define RTC_CTL2_BIT_VDSL 0x80
75
76/*
77 * Note: the RX8025 I2C RTC requires register
78 * reads and write to consist of a single bus
79 * cycle. It is not allowed to write the register
80 * address in a first cycle that is terminated by
81 * a STOP condition. The chips needs a 'restart'
82 * sequence (start sequence without a prior stop).
83 * This driver has been written for a 4xx board.
84 * U-Boot's 4xx i2c driver is currently not capable
85 * to generate such cycles to some work arounds
86 * are used.
87 */
88
89/* static uchar rtc_read (uchar reg); */
90#define rtc_read(reg) buf[((reg) + 1) & 0xf]
91
92static void rtc_write (uchar reg, uchar val);
93static uchar bin2bcd (unsigned int n);
94static unsigned bcd2bin (uchar c);
95
96/*
97 * Get the current time from the RTC
98 */
99void rtc_get (struct rtc_time *tmp)
100{
101 uchar sec, min, hour, mday, wday, mon, year, ctl2;
102 uchar buf[16];
103
104 if (i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, 16))
105 printf("Error reading from RTC\n");
106
107 sec = rtc_read(RTC_SEC_REG_ADDR);
108 min = rtc_read(RTC_MIN_REG_ADDR);
109 hour = rtc_read(RTC_HR_REG_ADDR);
110 wday = rtc_read(RTC_DAY_REG_ADDR);
111 mday = rtc_read(RTC_DATE_REG_ADDR);
112 mon = rtc_read(RTC_MON_REG_ADDR);
113 year = rtc_read(RTC_YR_REG_ADDR);
114
115 DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
116 "hr: %02x min: %02x sec: %02x\n",
117 year, mon, mday, wday, hour, min, sec);
118
119 /* dump status */
120 ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
121 if (ctl2 & RTC_CTL2_BIT_PON)
122 printf("RTC: power-on detected\n");
123
124 if (ctl2 & RTC_CTL2_BIT_VDET)
125 printf("RTC: voltage drop detected\n");
126
127 if (!(ctl2 & RTC_CTL2_BIT_XST))
128 printf("RTC: oscillator stop detected\n");
129
130 tmp->tm_sec = bcd2bin (sec & 0x7F);
131 tmp->tm_min = bcd2bin (min & 0x7F);
132 tmp->tm_hour = bcd2bin (hour & 0x3F);
133 tmp->tm_mday = bcd2bin (mday & 0x3F);
134 tmp->tm_mon = bcd2bin (mon & 0x1F);
135 tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
136 tmp->tm_wday = bcd2bin (wday & 0x07);
137 tmp->tm_yday = 0;
138 tmp->tm_isdst= 0;
139
140 DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
141 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
142 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
143}
144
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100145/*
146 * Set the RTC
147 */
148void rtc_set (struct rtc_time *tmp)
149{
150 DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
151 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
152 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
153
154 if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
155 printf("WARNING: year should be between 1970 and 2069!\n");
156
157 rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
158 rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
159 rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
160 rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
161 rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
162 rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
163 rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
164
165 rtc_write (RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);
166}
167
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100168/*
169 * Reset the RTC. We setting the date back to 1970-01-01.
170 */
171void rtc_reset (void)
172{
173 struct rtc_time tmp;
174 uchar buf[16];
175 uchar ctl2;
176
177 if (i2c_read(CFG_I2C_RTC_ADDR, 0, 0, buf, 16))
178 printf("Error reading from RTC\n");
179
180 ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
181 ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
182 ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
183 rtc_write (RTC_CTL2_REG_ADDR, ctl2);
184
185 tmp.tm_year = 1970;
186 tmp.tm_mon = 1;
187 tmp.tm_mday= 1;
188 tmp.tm_hour = 0;
189 tmp.tm_min = 0;
190 tmp.tm_sec = 0;
191
192 rtc_set(&tmp);
193
194 printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
195 tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
196 tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
197
198 return;
199}
200
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100201/*
202 * Helper functions
203 */
204static void rtc_write (uchar reg, uchar val)
205{
206 uchar buf[2];
207 buf[0] = reg << 4;
208 buf[1] = val;
209 if (i2c_write(CFG_I2C_RTC_ADDR, 0, 0, buf, 2) != 0)
210 printf("Error writing to RTC\n");
211
212}
213
214static unsigned bcd2bin (uchar n)
215{
216 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
217}
218
219static unsigned char bin2bcd (unsigned int n)
220{
221 return (((n / 10) << 4) | (n % 10));
222}
223
Jean-Christophe PLAGNIOL-VILLARD1b769882008-01-25 07:54:47 +0100224#endif /* CONFIG_RTC_RX8025 && CONFIG_CMD_DATE */