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1 | /* | |
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_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 CONFIG_SYS_I2C_RTC_ADDR | |
46 | # define CONFIG_SYS_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 | ||
92 | static void rtc_write (uchar reg, uchar val); | |
93 | static uchar bin2bcd (unsigned int n); | |
94 | static unsigned bcd2bin (uchar c); | |
95 | ||
96 | /* | |
97 | * Get the current time from the RTC | |
98 | */ | |
99 | int rtc_get (struct rtc_time *tmp) | |
100 | { | |
101 | int rel = 0; | |
102 | uchar sec, min, hour, mday, wday, mon, year, ctl2; | |
103 | uchar buf[16]; | |
104 | ||
105 | if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16)) | |
106 | 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); | |
122 | if (ctl2 & RTC_CTL2_BIT_PON) { | |
123 | printf("RTC: power-on detected\n"); | |
124 | rel = -1; | |
125 | } | |
126 | ||
127 | if (ctl2 & RTC_CTL2_BIT_VDET) { | |
128 | printf("RTC: voltage drop detected\n"); | |
129 | rel = -1; | |
130 | } | |
131 | ||
132 | if (!(ctl2 & RTC_CTL2_BIT_XST)) { | |
133 | printf("RTC: oscillator stop detected\n"); | |
134 | rel = -1; | |
135 | } | |
136 | ||
137 | tmp->tm_sec = bcd2bin (sec & 0x7F); | |
138 | tmp->tm_min = bcd2bin (min & 0x7F); | |
139 | 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); | |
144 | 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); | |
154 | ||
155 | return rel; | |
156 | } | |
157 | ||
158 | /* | |
159 | * Set the RTC | |
160 | */ | |
161 | int rtc_set (struct rtc_time *tmp) | |
162 | { | |
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); | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
184 | * Reset the RTC. We setting the date back to 1970-01-01. | |
185 | */ | |
186 | void rtc_reset (void) | |
187 | { | |
188 | struct rtc_time tmp; | |
189 | uchar buf[16]; | |
190 | uchar ctl2; | |
191 | ||
192 | if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16)) | |
193 | 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 | ||
216 | /* | |
217 | * Helper functions | |
218 | */ | |
219 | static void rtc_write (uchar reg, uchar val) | |
220 | { | |
221 | uchar buf[2]; | |
222 | buf[0] = reg << 4; | |
223 | buf[1] = val; | |
224 | if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 2) != 0) | |
225 | printf("Error writing to RTC\n"); | |
226 | ||
227 | } | |
228 | ||
229 | static unsigned bcd2bin (uchar n) | |
230 | { | |
231 | return ((((n >> 4) & 0x0F) * 10) + (n & 0x0F)); | |
232 | } | |
233 | ||
234 | static unsigned char bin2bcd (unsigned int n) | |
235 | { | |
236 | return (((n / 10) << 4) | (n % 10)); | |
237 | } | |
238 | ||
239 | #endif /* CONFIG_RTC_RX8025 && CONFIG_CMD_DATE */ |