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wdenkb6508512004-10-10 18:03:33 +00001/*
2 * rs5c372.c
3 *
4 * Device driver for Ricoh's Real Time Controller RS5C372A.
5 *
6 * Copyright (C) 2004 Gary Jennejohn garyj@denx.de
7 *
8 * Based in part in ds1307.c -
9 * (C) Copyright 2001, 2002, 2003
10 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
11 * Keith Outwater, keith_outwater@mvis.com`
12 * Steven Scholz, steven.scholz@imc-berlin.de
13 *
14 * See file CREDITS for list of people who contributed to this
15 * project.
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License version 2 as
Wolfgang Denk3765b3e2013-10-07 13:07:26 +020019 * published by the Free Software Foundation.
wdenkb6508512004-10-10 18:03:33 +000020 */
21
22#include <common.h>
23#include <command.h>
24#include <rtc.h>
25#include <i2c.h>
26
Michal Simek871c18d2008-07-14 19:45:37 +020027#if defined(CONFIG_CMD_DATE)
wdenkb6508512004-10-10 18:03:33 +000028/*
29 * Reads are always done starting with register 15, which requires some
30 * jumping-through-hoops to access the data correctly.
31 *
32 * Writes are always done starting with register 0.
33 */
34
35#define DEBUG 0
36
37#if DEBUG
38static unsigned int rtc_debug = DEBUG;
39#else
40#define rtc_debug 0 /* gcc will remove all the debug code for us */
41#endif
42
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020043#ifndef CONFIG_SYS_I2C_RTC_ADDR
44#define CONFIG_SYS_I2C_RTC_ADDR 0x32
wdenkb6508512004-10-10 18:03:33 +000045#endif
46
47#define RS5C372_RAM_SIZE 0x10
48#define RATE_32000HZ 0x80 /* Rate Select 32.000KHz */
49#define RATE_32768HZ 0x00 /* Rate Select 32.768KHz */
50
51#define STATUS_XPT 0x10 /* data invalid because voltage was 0 */
52
53#define USE_24HOUR_MODE 0x20
54#define TWELVE_HOUR_MODE(n) ((((n) >> 5) & 1) == 0)
55#define HOURS_AP(n) (((n) >> 5) & 1)
56#define HOURS_12(n) bcd2bin((n) & 0x1F)
57#define HOURS_24(n) bcd2bin((n) & 0x3F)
58
59
wdenkb6508512004-10-10 18:03:33 +000060static int setup_done = 0;
61
62static int
Wolfgang Denkd52fb7e2006-03-11 22:53:33 +010063rs5c372_readram(unsigned char *buf, int len)
wdenkb6508512004-10-10 18:03:33 +000064{
65 int ret;
66
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020067 ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, len);
wdenkb6508512004-10-10 18:03:33 +000068 if (ret != 0) {
69 printf("%s: failed to read\n", __FUNCTION__);
70 return ret;
71 }
72
73 if (buf[0] & STATUS_XPT)
74 printf("### Warning: RTC lost power\n");
75
76 return ret;
77}
78
79static void
80rs5c372_enable(void)
81{
82 unsigned char buf[RS5C372_RAM_SIZE + 1];
83 int ret;
84
wdenkb6508512004-10-10 18:03:33 +000085 /* note that this returns reg. 15 in buf[1] */
86 ret = rs5c372_readram(&buf[1], RS5C372_RAM_SIZE);
87 if (ret != 0) {
88 printf("%s: failed\n", __FUNCTION__);
89 return;
90 }
91
92 buf[0] = 0;
93 /* we want to start writing at register 0 so we have to copy the */
94 /* register contents up one slot */
95 for (ret = 2; ret < 9; ret++)
96 buf[ret - 1] = buf[ret];
97 /* registers 0 to 6 (time values) are not touched */
98 buf[8] = RATE_32768HZ; /* reg. 7 */
99 buf[9] = 0; /* reg. 8 */
100 buf[10] = 0; /* reg. 9 */
101 buf[11] = 0; /* reg. 10 */
102 buf[12] = 0; /* reg. 11 */
103 buf[13] = 0; /* reg. 12 */
104 buf[14] = 0; /* reg. 13 */
105 buf[15] = 0; /* reg. 14 */
106 buf[16] = USE_24HOUR_MODE; /* reg. 15 */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200107 ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, RS5C372_RAM_SIZE+1);
wdenkb6508512004-10-10 18:03:33 +0000108 if (ret != 0) {
109 printf("%s: failed\n", __FUNCTION__);
110 return;
111 }
112 setup_done = 1;
113
114 return;
115}
116
117static void
Wolfgang Denkd52fb7e2006-03-11 22:53:33 +0100118rs5c372_convert_to_time(struct rtc_time *dt, unsigned char *buf)
wdenkb6508512004-10-10 18:03:33 +0000119{
120 /* buf[0] is register 15 */
121 dt->tm_sec = bcd2bin(buf[1]);
122 dt->tm_min = bcd2bin(buf[2]);
123
124 if (TWELVE_HOUR_MODE(buf[0])) {
125 dt->tm_hour = HOURS_12(buf[3]);
126 if (HOURS_AP(buf[3])) /* PM */
127 dt->tm_hour += 12;
128 } else /* 24-hour-mode */
129 dt->tm_hour = HOURS_24(buf[3]);
130
131 dt->tm_mday = bcd2bin(buf[5]);
132 dt->tm_mon = bcd2bin(buf[6]);
133 dt->tm_year = bcd2bin(buf[7]);
134 if (dt->tm_year >= 70)
135 dt->tm_year += 1900;
136 else
137 dt->tm_year += 2000;
138 /* 0 is Sunday */
139 dt->tm_wday = bcd2bin(buf[4] & 0x07);
140 dt->tm_yday = 0;
141 dt->tm_isdst= 0;
142
143 if(rtc_debug > 2) {
144 printf("rs5c372_convert_to_time: year = %d\n", dt->tm_year);
145 printf("rs5c372_convert_to_time: mon = %d\n", dt->tm_mon);
146 printf("rs5c372_convert_to_time: mday = %d\n", dt->tm_mday);
147 printf("rs5c372_convert_to_time: hour = %d\n", dt->tm_hour);
148 printf("rs5c372_convert_to_time: min = %d\n", dt->tm_min);
149 printf("rs5c372_convert_to_time: sec = %d\n", dt->tm_sec);
150 }
151}
152
153/*
154 * Get the current time from the RTC
155 */
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300156int
wdenkb6508512004-10-10 18:03:33 +0000157rtc_get (struct rtc_time *tmp)
158{
159 unsigned char buf[RS5C372_RAM_SIZE];
160 int ret;
161
162 if (!setup_done)
163 rs5c372_enable();
164
165 if (!setup_done)
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300166 return -1;
wdenkb6508512004-10-10 18:03:33 +0000167
168 memset(buf, 0, sizeof(buf));
169
170 /* note that this returns reg. 15 in buf[0] */
171 ret = rs5c372_readram(buf, RS5C372_RAM_SIZE);
172 if (ret != 0) {
173 printf("%s: failed\n", __FUNCTION__);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300174 return -1;
wdenkb6508512004-10-10 18:03:33 +0000175 }
176
177 rs5c372_convert_to_time(tmp, buf);
178
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300179 return 0;
wdenkb6508512004-10-10 18:03:33 +0000180}
181
182/*
183 * Set the RTC
184 */
Jean-Christophe PLAGNIOL-VILLARD13b4db02008-09-09 00:59:39 +0200185int rtc_set (struct rtc_time *tmp)
wdenkb6508512004-10-10 18:03:33 +0000186{
187 unsigned char buf[8], reg15;
188 int ret;
189
190 if (!setup_done)
191 rs5c372_enable();
192
193 if (!setup_done)
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200194 return -1;
wdenkb6508512004-10-10 18:03:33 +0000195
196 if(rtc_debug > 2) {
197 printf("rtc_set: tm_year = %d\n", tmp->tm_year);
198 printf("rtc_set: tm_mon = %d\n", tmp->tm_mon);
199 printf("rtc_set: tm_mday = %d\n", tmp->tm_mday);
200 printf("rtc_set: tm_hour = %d\n", tmp->tm_hour);
201 printf("rtc_set: tm_min = %d\n", tmp->tm_min);
202 printf("rtc_set: tm_sec = %d\n", tmp->tm_sec);
203 }
204
205 memset(buf, 0, sizeof(buf));
206
207 /* only read register 15 */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200208 ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 1);
wdenkb6508512004-10-10 18:03:33 +0000209
210 if (ret == 0) {
211 /* need to save register 15 */
212 reg15 = buf[0];
213 buf[0] = 0; /* register address on RS5C372 */
214 buf[1] = bin2bcd(tmp->tm_sec);
215 buf[2] = bin2bcd(tmp->tm_min);
216 /* need to handle 12 hour mode */
217 if (TWELVE_HOUR_MODE(reg15)) {
218 if (tmp->tm_hour >= 12) { /* PM */
219 /* 12 PM is a special case */
220 if (tmp->tm_hour == 12)
221 buf[3] = bin2bcd(tmp->tm_hour);
222 else
223 buf[3] = bin2bcd(tmp->tm_hour - 12);
224 buf[3] |= 0x20;
225 }
226 } else {
227 buf[3] = bin2bcd(tmp->tm_hour);
228 }
229
230 buf[4] = bin2bcd(tmp->tm_wday);
231 buf[5] = bin2bcd(tmp->tm_mday);
232 buf[6] = bin2bcd(tmp->tm_mon);
233 if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
234 printf("WARNING: year should be between 1970 and 2069!\n");
235 buf[7] = bin2bcd(tmp->tm_year % 100);
236
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200237 ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 8);
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200238 if (ret != 0) {
wdenkb6508512004-10-10 18:03:33 +0000239 printf("rs5c372_set_datetime(), i2c_master_send() returned %d\n",ret);
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200240 return -1;
241 }
242 } else {
243 return -1;
wdenkb6508512004-10-10 18:03:33 +0000244 }
245
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200246 return 0;
wdenkb6508512004-10-10 18:03:33 +0000247}
248
249/*
250 * Reset the RTC. We set the date back to 1970-01-01.
251 */
252void
253rtc_reset (void)
254{
255 struct rtc_time tmp;
256
257 if (!setup_done)
258 rs5c372_enable();
259
260 if (!setup_done)
261 return;
262
263 tmp.tm_year = 1970;
264 tmp.tm_mon = 1;
265 /* Jan. 1, 1970 was a Thursday */
266 tmp.tm_wday= 4;
267 tmp.tm_mday= 1;
268 tmp.tm_hour = 0;
269 tmp.tm_min = 0;
270 tmp.tm_sec = 0;
271
272 rtc_set(&tmp);
273
274 printf ("RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
275 tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
276 tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
277
278 return;
279}
280
Jon Loeligera5938142007-07-09 18:10:50 -0500281#endif