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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
Michal Simek871c18d2008-07-14 19:45:37 +020033#if defined(CONFIG_CMD_DATE)
Matthias Fuchs95c6bc72007-12-27 16:55:17 +010034
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
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020045#ifndef CONFIG_SYS_I2C_RTC_ADDR
46# define CONFIG_SYS_I2C_RTC_ADDR 0x32
Matthias Fuchs95c6bc72007-12-27 16:55:17 +010047#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 */
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +030099int rtc_get (struct rtc_time *tmp)
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100100{
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300101 int rel = 0;
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100102 uchar sec, min, hour, mday, wday, mon, year, ctl2;
103 uchar buf[16];
104
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200105 if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16))
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100106 printf("Error reading from RTC\n");
107
108 sec = rtc_read(RTC_SEC_REG_ADDR);
109 min = rtc_read(RTC_MIN_REG_ADDR);
110 hour = rtc_read(RTC_HR_REG_ADDR);
111 wday = rtc_read(RTC_DAY_REG_ADDR);
112 mday = rtc_read(RTC_DATE_REG_ADDR);
113 mon = rtc_read(RTC_MON_REG_ADDR);
114 year = rtc_read(RTC_YR_REG_ADDR);
115
116 DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x "
117 "hr: %02x min: %02x sec: %02x\n",
118 year, mon, mday, wday, hour, min, sec);
119
120 /* dump status */
121 ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300122 if (ctl2 & RTC_CTL2_BIT_PON) {
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100123 printf("RTC: power-on detected\n");
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300124 rel = -1;
125 }
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100126
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300127 if (ctl2 & RTC_CTL2_BIT_VDET) {
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100128 printf("RTC: voltage drop detected\n");
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300129 rel = -1;
130 }
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100131
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300132 if (!(ctl2 & RTC_CTL2_BIT_XST)) {
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100133 printf("RTC: oscillator stop detected\n");
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300134 rel = -1;
135 }
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100136
137 tmp->tm_sec = bcd2bin (sec & 0x7F);
138 tmp->tm_min = bcd2bin (min & 0x7F);
Yuri Tikhonov5875d352008-08-15 15:42:09 +0200139 if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412)
140 tmp->tm_hour = bcd2bin (hour & 0x3F);
141 else
142 tmp->tm_hour = bcd2bin (hour & 0x1F) % 12 +
143 ((hour & 0x20) ? 12 : 0);
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100144 tmp->tm_mday = bcd2bin (mday & 0x3F);
145 tmp->tm_mon = bcd2bin (mon & 0x1F);
146 tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000);
147 tmp->tm_wday = bcd2bin (wday & 0x07);
148 tmp->tm_yday = 0;
149 tmp->tm_isdst= 0;
150
151 DEBUGR ("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
152 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
153 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300154
155 return rel;
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100156}
157
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100158/*
159 * Set the RTC
160 */
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200161int rtc_set (struct rtc_time *tmp)
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100162{
163 DEBUGR ("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
164 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
165 tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
166
167 if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
168 printf("WARNING: year should be between 1970 and 2069!\n");
169
170 rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100));
171 rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon));
172 rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday));
173 rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday));
174 rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour));
175 rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min));
176 rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec));
177
178 rtc_write (RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412);
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200179
180 return 0;
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100181}
182
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100183/*
184 * Reset the RTC. We setting the date back to 1970-01-01.
185 */
186void rtc_reset (void)
187{
188 struct rtc_time tmp;
189 uchar buf[16];
190 uchar ctl2;
191
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200192 if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16))
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100193 printf("Error reading from RTC\n");
194
195 ctl2 = rtc_read(RTC_CTL2_REG_ADDR);
196 ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET);
197 ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL;
198 rtc_write (RTC_CTL2_REG_ADDR, ctl2);
199
200 tmp.tm_year = 1970;
201 tmp.tm_mon = 1;
202 tmp.tm_mday= 1;
203 tmp.tm_hour = 0;
204 tmp.tm_min = 0;
205 tmp.tm_sec = 0;
206
207 rtc_set(&tmp);
208
209 printf ( "RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
210 tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
211 tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
212
213 return;
214}
215
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100216/*
217 * Helper functions
218 */
219static void rtc_write (uchar reg, uchar val)
220{
221 uchar buf[2];
222 buf[0] = reg << 4;
223 buf[1] = val;
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200224 if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 2) != 0)
Matthias Fuchs95c6bc72007-12-27 16:55:17 +0100225 printf("Error writing to RTC\n");
226
227}
228
229static unsigned bcd2bin (uchar n)
230{
231 return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F));
232}
233
234static unsigned char bin2bcd (unsigned int n)
235{
236 return (((n / 10) << 4) | (n % 10));
237}
238
Jean-Christophe PLAGNIOL-VILLARD1b769882008-01-25 07:54:47 +0100239#endif /* CONFIG_RTC_RX8025 && CONFIG_CMD_DATE */