Tom Rini | 10e4779 | 2018-05-06 17:58:06 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0+ |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 2 | /* |
| 3 | * (C) Copyright 2001 |
| 4 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | /* |
| 8 | * Date & Time support for Philips PCF8563 RTC |
| 9 | */ |
| 10 | |
| 11 | /* #define DEBUG */ |
| 12 | |
| 13 | #include <common.h> |
| 14 | #include <command.h> |
Biwen Li | d00ffb5 | 2019-12-31 15:33:37 +0800 | [diff] [blame] | 15 | #include <dm.h> |
Simon Glass | 0f2af88 | 2020-05-10 11:40:05 -0600 | [diff] [blame] | 16 | #include <log.h> |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 17 | #include <rtc.h> |
| 18 | #include <i2c.h> |
| 19 | |
Biwen Li | d00ffb5 | 2019-12-31 15:33:37 +0800 | [diff] [blame] | 20 | #if !CONFIG_IS_ENABLED(DM_RTC) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 21 | static uchar rtc_read (uchar reg); |
| 22 | static void rtc_write (uchar reg, uchar val); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 23 | |
| 24 | /* ------------------------------------------------------------------------- */ |
| 25 | |
Yuri Tikhonov | 9bacd94 | 2008-03-20 17:56:04 +0300 | [diff] [blame] | 26 | int rtc_get (struct rtc_time *tmp) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 27 | { |
Yuri Tikhonov | 9bacd94 | 2008-03-20 17:56:04 +0300 | [diff] [blame] | 28 | int rel = 0; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 29 | uchar sec, min, hour, mday, wday, mon_cent, year; |
| 30 | |
| 31 | sec = rtc_read (0x02); |
| 32 | min = rtc_read (0x03); |
| 33 | hour = rtc_read (0x04); |
| 34 | mday = rtc_read (0x05); |
| 35 | wday = rtc_read (0x06); |
| 36 | mon_cent= rtc_read (0x07); |
| 37 | year = rtc_read (0x08); |
| 38 | |
| 39 | debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " |
| 40 | "hr: %02x min: %02x sec: %02x\n", |
| 41 | year, mon_cent, mday, wday, |
| 42 | hour, min, sec ); |
| 43 | debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n", |
| 44 | rtc_read (0x0C), |
| 45 | rtc_read (0x0B), |
| 46 | rtc_read (0x0A), |
| 47 | rtc_read (0x09) ); |
| 48 | |
| 49 | if (sec & 0x80) { |
wdenk | 42c0547 | 2004-03-23 22:14:11 +0000 | [diff] [blame] | 50 | puts ("### Warning: RTC Low Voltage - date/time not reliable\n"); |
Yuri Tikhonov | 9bacd94 | 2008-03-20 17:56:04 +0300 | [diff] [blame] | 51 | rel = -1; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | tmp->tm_sec = bcd2bin (sec & 0x7F); |
| 55 | tmp->tm_min = bcd2bin (min & 0x7F); |
| 56 | tmp->tm_hour = bcd2bin (hour & 0x3F); |
| 57 | tmp->tm_mday = bcd2bin (mday & 0x3F); |
| 58 | tmp->tm_mon = bcd2bin (mon_cent & 0x1F); |
Benoît Thébaudeau | 71d4389 | 2012-07-20 16:05:36 +0200 | [diff] [blame] | 59 | tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 60 | tmp->tm_wday = bcd2bin (wday & 0x07); |
| 61 | tmp->tm_yday = 0; |
| 62 | tmp->tm_isdst= 0; |
| 63 | |
| 64 | debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
| 65 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
| 66 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
Yuri Tikhonov | 9bacd94 | 2008-03-20 17:56:04 +0300 | [diff] [blame] | 67 | |
| 68 | return rel; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 69 | } |
| 70 | |
Jean-Christophe PLAGNIOL-VILLARD | 97a2e10 | 2008-09-01 23:06:23 +0200 | [diff] [blame] | 71 | int rtc_set (struct rtc_time *tmp) |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 72 | { |
| 73 | uchar century; |
| 74 | |
| 75 | debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
| 76 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
| 77 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
| 78 | |
| 79 | rtc_write (0x08, bin2bcd(tmp->tm_year % 100)); |
| 80 | |
Benoît Thébaudeau | 71d4389 | 2012-07-20 16:05:36 +0200 | [diff] [blame] | 81 | century = (tmp->tm_year >= 2000) ? 0 : 0x80; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 82 | rtc_write (0x07, bin2bcd(tmp->tm_mon) | century); |
| 83 | |
| 84 | rtc_write (0x06, bin2bcd(tmp->tm_wday)); |
| 85 | rtc_write (0x05, bin2bcd(tmp->tm_mday)); |
| 86 | rtc_write (0x04, bin2bcd(tmp->tm_hour)); |
| 87 | rtc_write (0x03, bin2bcd(tmp->tm_min )); |
| 88 | rtc_write (0x02, bin2bcd(tmp->tm_sec )); |
Jean-Christophe PLAGNIOL-VILLARD | 97a2e10 | 2008-09-01 23:06:23 +0200 | [diff] [blame] | 89 | |
| 90 | return 0; |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | void rtc_reset (void) |
| 94 | { |
| 95 | /* clear all control & status registers */ |
| 96 | rtc_write (0x00, 0x00); |
| 97 | rtc_write (0x01, 0x00); |
| 98 | rtc_write (0x0D, 0x00); |
| 99 | |
| 100 | /* clear Voltage Low bit */ |
| 101 | rtc_write (0x02, rtc_read (0x02) & 0x7F); |
| 102 | |
| 103 | /* reset all alarms */ |
| 104 | rtc_write (0x09, 0x00); |
| 105 | rtc_write (0x0A, 0x00); |
| 106 | rtc_write (0x0B, 0x00); |
| 107 | rtc_write (0x0C, 0x00); |
| 108 | } |
| 109 | |
| 110 | /* ------------------------------------------------------------------------- */ |
| 111 | |
| 112 | static uchar rtc_read (uchar reg) |
| 113 | { |
Tom Rini | 6a5dccc | 2022-11-16 13:10:41 -0500 | [diff] [blame] | 114 | return (i2c_reg_read (CFG_SYS_I2C_RTC_ADDR, reg)); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | static void rtc_write (uchar reg, uchar val) |
| 118 | { |
Tom Rini | 6a5dccc | 2022-11-16 13:10:41 -0500 | [diff] [blame] | 119 | i2c_reg_write (CFG_SYS_I2C_RTC_ADDR, reg, val); |
wdenk | fe8c280 | 2002-11-03 00:38:21 +0000 | [diff] [blame] | 120 | } |
Biwen Li | d00ffb5 | 2019-12-31 15:33:37 +0800 | [diff] [blame] | 121 | #else |
| 122 | static int pcf8563_rtc_get(struct udevice *dev, struct rtc_time *tmp) |
| 123 | { |
| 124 | int rel = 0; |
| 125 | uchar sec, min, hour, mday, wday, mon_cent, year; |
| 126 | |
| 127 | sec = dm_i2c_reg_read(dev, 0x02); |
| 128 | min = dm_i2c_reg_read(dev, 0x03); |
| 129 | hour = dm_i2c_reg_read(dev, 0x04); |
| 130 | mday = dm_i2c_reg_read(dev, 0x05); |
| 131 | wday = dm_i2c_reg_read(dev, 0x06); |
| 132 | mon_cent = dm_i2c_reg_read(dev, 0x07); |
| 133 | year = dm_i2c_reg_read(dev, 0x08); |
| 134 | |
| 135 | debug("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x ", |
| 136 | year, mon_cent, mday, wday); |
| 137 | debug("hr: %02x min: %02x sec: %02x\n", |
| 138 | hour, min, sec); |
| 139 | debug("Alarms: wday: %02x day: %02x hour: %02x min: %02x\n", |
| 140 | dm_i2c_reg_read(dev, 0x0C), |
| 141 | dm_i2c_reg_read(dev, 0x0B), |
| 142 | dm_i2c_reg_read(dev, 0x0A), |
| 143 | dm_i2c_reg_read(dev, 0x09)); |
| 144 | |
| 145 | if (sec & 0x80) { |
| 146 | puts("### Warning: RTC Low Voltage - date/time not reliable\n"); |
| 147 | rel = -1; |
| 148 | } |
| 149 | |
| 150 | tmp->tm_sec = bcd2bin(sec & 0x7F); |
| 151 | tmp->tm_min = bcd2bin(min & 0x7F); |
| 152 | tmp->tm_hour = bcd2bin(hour & 0x3F); |
| 153 | tmp->tm_mday = bcd2bin(mday & 0x3F); |
| 154 | tmp->tm_mon = bcd2bin(mon_cent & 0x1F); |
| 155 | tmp->tm_year = bcd2bin(year) + ((mon_cent & 0x80) ? 1900 : 2000); |
| 156 | tmp->tm_wday = bcd2bin(wday & 0x07); |
| 157 | tmp->tm_yday = 0; |
| 158 | tmp->tm_isdst = 0; |
| 159 | |
| 160 | debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
| 161 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
| 162 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
| 163 | |
| 164 | return rel; |
| 165 | } |
| 166 | |
| 167 | static int pcf8563_rtc_set(struct udevice *dev, const struct rtc_time *tmp) |
| 168 | { |
| 169 | uchar century; |
| 170 | |
| 171 | debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
| 172 | tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
| 173 | tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
| 174 | |
| 175 | dm_i2c_reg_write(dev, 0x08, bin2bcd(tmp->tm_year % 100)); |
| 176 | |
| 177 | century = (tmp->tm_year >= 2000) ? 0 : 0x80; |
| 178 | dm_i2c_reg_write(dev, 0x07, bin2bcd(tmp->tm_mon) | century); |
| 179 | |
| 180 | dm_i2c_reg_write(dev, 0x06, bin2bcd(tmp->tm_wday)); |
| 181 | dm_i2c_reg_write(dev, 0x05, bin2bcd(tmp->tm_mday)); |
| 182 | dm_i2c_reg_write(dev, 0x04, bin2bcd(tmp->tm_hour)); |
| 183 | dm_i2c_reg_write(dev, 0x03, bin2bcd(tmp->tm_min)); |
| 184 | dm_i2c_reg_write(dev, 0x02, bin2bcd(tmp->tm_sec)); |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static int pcf8563_rtc_reset(struct udevice *dev) |
| 190 | { |
| 191 | /* clear all control & status registers */ |
| 192 | dm_i2c_reg_write(dev, 0x00, 0x00); |
| 193 | dm_i2c_reg_write(dev, 0x01, 0x00); |
| 194 | dm_i2c_reg_write(dev, 0x0D, 0x00); |
| 195 | |
| 196 | /* clear Voltage Low bit */ |
| 197 | dm_i2c_reg_write(dev, 0x02, dm_i2c_reg_read(dev, 0x02) & 0x7F); |
| 198 | |
| 199 | /* reset all alarms */ |
| 200 | dm_i2c_reg_write(dev, 0x09, 0x00); |
| 201 | dm_i2c_reg_write(dev, 0x0A, 0x00); |
| 202 | dm_i2c_reg_write(dev, 0x0B, 0x00); |
| 203 | dm_i2c_reg_write(dev, 0x0C, 0x00); |
| 204 | |
| 205 | return 0; |
| 206 | } |
| 207 | |
| 208 | static const struct rtc_ops pcf8563_rtc_ops = { |
| 209 | .get = pcf8563_rtc_get, |
| 210 | .set = pcf8563_rtc_set, |
| 211 | .reset = pcf8563_rtc_reset, |
| 212 | }; |
| 213 | |
| 214 | static const struct udevice_id pcf8563_rtc_ids[] = { |
| 215 | { .compatible = "nxp,pcf8563" }, |
| 216 | { } |
| 217 | }; |
| 218 | |
| 219 | U_BOOT_DRIVER(rtc_pcf8563) = { |
| 220 | .name = "rtc-pcf8563", |
| 221 | .id = UCLASS_RTC, |
| 222 | .of_match = pcf8563_rtc_ids, |
| 223 | .ops = &pcf8563_rtc_ops, |
| 224 | }; |
| 225 | #endif |