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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
19 * published by the Free Software Foundation.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 * MA 02111-1307 USA
30 */
31
32#include <common.h>
33#include <command.h>
34#include <rtc.h>
35#include <i2c.h>
36
Michal Simek871c18d2008-07-14 19:45:37 +020037#if defined(CONFIG_CMD_DATE)
wdenkb6508512004-10-10 18:03:33 +000038/*
39 * Reads are always done starting with register 15, which requires some
40 * jumping-through-hoops to access the data correctly.
41 *
42 * Writes are always done starting with register 0.
43 */
44
45#define DEBUG 0
46
47#if DEBUG
48static unsigned int rtc_debug = DEBUG;
49#else
50#define rtc_debug 0 /* gcc will remove all the debug code for us */
51#endif
52
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020053#ifndef CONFIG_SYS_I2C_RTC_ADDR
54#define CONFIG_SYS_I2C_RTC_ADDR 0x32
wdenkb6508512004-10-10 18:03:33 +000055#endif
56
57#define RS5C372_RAM_SIZE 0x10
58#define RATE_32000HZ 0x80 /* Rate Select 32.000KHz */
59#define RATE_32768HZ 0x00 /* Rate Select 32.768KHz */
60
61#define STATUS_XPT 0x10 /* data invalid because voltage was 0 */
62
63#define USE_24HOUR_MODE 0x20
64#define TWELVE_HOUR_MODE(n) ((((n) >> 5) & 1) == 0)
65#define HOURS_AP(n) (((n) >> 5) & 1)
66#define HOURS_12(n) bcd2bin((n) & 0x1F)
67#define HOURS_24(n) bcd2bin((n) & 0x3F)
68
69
wdenkb6508512004-10-10 18:03:33 +000070static int setup_done = 0;
71
72static int
Wolfgang Denkd52fb7e2006-03-11 22:53:33 +010073rs5c372_readram(unsigned char *buf, int len)
wdenkb6508512004-10-10 18:03:33 +000074{
75 int ret;
76
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020077 ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, len);
wdenkb6508512004-10-10 18:03:33 +000078 if (ret != 0) {
79 printf("%s: failed to read\n", __FUNCTION__);
80 return ret;
81 }
82
83 if (buf[0] & STATUS_XPT)
84 printf("### Warning: RTC lost power\n");
85
86 return ret;
87}
88
89static void
90rs5c372_enable(void)
91{
92 unsigned char buf[RS5C372_RAM_SIZE + 1];
93 int ret;
94
wdenkb6508512004-10-10 18:03:33 +000095 /* note that this returns reg. 15 in buf[1] */
96 ret = rs5c372_readram(&buf[1], RS5C372_RAM_SIZE);
97 if (ret != 0) {
98 printf("%s: failed\n", __FUNCTION__);
99 return;
100 }
101
102 buf[0] = 0;
103 /* we want to start writing at register 0 so we have to copy the */
104 /* register contents up one slot */
105 for (ret = 2; ret < 9; ret++)
106 buf[ret - 1] = buf[ret];
107 /* registers 0 to 6 (time values) are not touched */
108 buf[8] = RATE_32768HZ; /* reg. 7 */
109 buf[9] = 0; /* reg. 8 */
110 buf[10] = 0; /* reg. 9 */
111 buf[11] = 0; /* reg. 10 */
112 buf[12] = 0; /* reg. 11 */
113 buf[13] = 0; /* reg. 12 */
114 buf[14] = 0; /* reg. 13 */
115 buf[15] = 0; /* reg. 14 */
116 buf[16] = USE_24HOUR_MODE; /* reg. 15 */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200117 ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, RS5C372_RAM_SIZE+1);
wdenkb6508512004-10-10 18:03:33 +0000118 if (ret != 0) {
119 printf("%s: failed\n", __FUNCTION__);
120 return;
121 }
122 setup_done = 1;
123
124 return;
125}
126
127static void
Wolfgang Denkd52fb7e2006-03-11 22:53:33 +0100128rs5c372_convert_to_time(struct rtc_time *dt, unsigned char *buf)
wdenkb6508512004-10-10 18:03:33 +0000129{
130 /* buf[0] is register 15 */
131 dt->tm_sec = bcd2bin(buf[1]);
132 dt->tm_min = bcd2bin(buf[2]);
133
134 if (TWELVE_HOUR_MODE(buf[0])) {
135 dt->tm_hour = HOURS_12(buf[3]);
136 if (HOURS_AP(buf[3])) /* PM */
137 dt->tm_hour += 12;
138 } else /* 24-hour-mode */
139 dt->tm_hour = HOURS_24(buf[3]);
140
141 dt->tm_mday = bcd2bin(buf[5]);
142 dt->tm_mon = bcd2bin(buf[6]);
143 dt->tm_year = bcd2bin(buf[7]);
144 if (dt->tm_year >= 70)
145 dt->tm_year += 1900;
146 else
147 dt->tm_year += 2000;
148 /* 0 is Sunday */
149 dt->tm_wday = bcd2bin(buf[4] & 0x07);
150 dt->tm_yday = 0;
151 dt->tm_isdst= 0;
152
153 if(rtc_debug > 2) {
154 printf("rs5c372_convert_to_time: year = %d\n", dt->tm_year);
155 printf("rs5c372_convert_to_time: mon = %d\n", dt->tm_mon);
156 printf("rs5c372_convert_to_time: mday = %d\n", dt->tm_mday);
157 printf("rs5c372_convert_to_time: hour = %d\n", dt->tm_hour);
158 printf("rs5c372_convert_to_time: min = %d\n", dt->tm_min);
159 printf("rs5c372_convert_to_time: sec = %d\n", dt->tm_sec);
160 }
161}
162
163/*
164 * Get the current time from the RTC
165 */
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300166int
wdenkb6508512004-10-10 18:03:33 +0000167rtc_get (struct rtc_time *tmp)
168{
169 unsigned char buf[RS5C372_RAM_SIZE];
170 int ret;
171
172 if (!setup_done)
173 rs5c372_enable();
174
175 if (!setup_done)
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300176 return -1;
wdenkb6508512004-10-10 18:03:33 +0000177
178 memset(buf, 0, sizeof(buf));
179
180 /* note that this returns reg. 15 in buf[0] */
181 ret = rs5c372_readram(buf, RS5C372_RAM_SIZE);
182 if (ret != 0) {
183 printf("%s: failed\n", __FUNCTION__);
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300184 return -1;
wdenkb6508512004-10-10 18:03:33 +0000185 }
186
187 rs5c372_convert_to_time(tmp, buf);
188
Yuri Tikhonovb73a19e2008-03-20 17:56:04 +0300189 return 0;
wdenkb6508512004-10-10 18:03:33 +0000190}
191
192/*
193 * Set the RTC
194 */
Jean-Christophe PLAGNIOL-VILLARD13b4db02008-09-09 00:59:39 +0200195int rtc_set (struct rtc_time *tmp)
wdenkb6508512004-10-10 18:03:33 +0000196{
197 unsigned char buf[8], reg15;
198 int ret;
199
200 if (!setup_done)
201 rs5c372_enable();
202
203 if (!setup_done)
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200204 return -1;
wdenkb6508512004-10-10 18:03:33 +0000205
206 if(rtc_debug > 2) {
207 printf("rtc_set: tm_year = %d\n", tmp->tm_year);
208 printf("rtc_set: tm_mon = %d\n", tmp->tm_mon);
209 printf("rtc_set: tm_mday = %d\n", tmp->tm_mday);
210 printf("rtc_set: tm_hour = %d\n", tmp->tm_hour);
211 printf("rtc_set: tm_min = %d\n", tmp->tm_min);
212 printf("rtc_set: tm_sec = %d\n", tmp->tm_sec);
213 }
214
215 memset(buf, 0, sizeof(buf));
216
217 /* only read register 15 */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200218 ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 1);
wdenkb6508512004-10-10 18:03:33 +0000219
220 if (ret == 0) {
221 /* need to save register 15 */
222 reg15 = buf[0];
223 buf[0] = 0; /* register address on RS5C372 */
224 buf[1] = bin2bcd(tmp->tm_sec);
225 buf[2] = bin2bcd(tmp->tm_min);
226 /* need to handle 12 hour mode */
227 if (TWELVE_HOUR_MODE(reg15)) {
228 if (tmp->tm_hour >= 12) { /* PM */
229 /* 12 PM is a special case */
230 if (tmp->tm_hour == 12)
231 buf[3] = bin2bcd(tmp->tm_hour);
232 else
233 buf[3] = bin2bcd(tmp->tm_hour - 12);
234 buf[3] |= 0x20;
235 }
236 } else {
237 buf[3] = bin2bcd(tmp->tm_hour);
238 }
239
240 buf[4] = bin2bcd(tmp->tm_wday);
241 buf[5] = bin2bcd(tmp->tm_mday);
242 buf[6] = bin2bcd(tmp->tm_mon);
243 if (tmp->tm_year < 1970 || tmp->tm_year > 2069)
244 printf("WARNING: year should be between 1970 and 2069!\n");
245 buf[7] = bin2bcd(tmp->tm_year % 100);
246
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200247 ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 8);
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200248 if (ret != 0) {
wdenkb6508512004-10-10 18:03:33 +0000249 printf("rs5c372_set_datetime(), i2c_master_send() returned %d\n",ret);
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200250 return -1;
251 }
252 } else {
253 return -1;
wdenkb6508512004-10-10 18:03:33 +0000254 }
255
Jean-Christophe PLAGNIOL-VILLARDd1e23192008-09-01 23:06:23 +0200256 return 0;
wdenkb6508512004-10-10 18:03:33 +0000257}
258
259/*
260 * Reset the RTC. We set the date back to 1970-01-01.
261 */
262void
263rtc_reset (void)
264{
265 struct rtc_time tmp;
266
267 if (!setup_done)
268 rs5c372_enable();
269
270 if (!setup_done)
271 return;
272
273 tmp.tm_year = 1970;
274 tmp.tm_mon = 1;
275 /* Jan. 1, 1970 was a Thursday */
276 tmp.tm_wday= 4;
277 tmp.tm_mday= 1;
278 tmp.tm_hour = 0;
279 tmp.tm_min = 0;
280 tmp.tm_sec = 0;
281
282 rtc_set(&tmp);
283
284 printf ("RTC: %4d-%02d-%02d %2d:%02d:%02d UTC\n",
285 tmp.tm_year, tmp.tm_mon, tmp.tm_mday,
286 tmp.tm_hour, tmp.tm_min, tmp.tm_sec);
287
288 return;
289}
290
Jon Loeligera5938142007-07-09 18:10:50 -0500291#endif