Blame view
drivers/rtc/rv3029.c
5.17 KB
d41ce506b Initial Release, ... |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 |
/* * (C) Copyright 2010 * Heiko Schocher, DENX Software Engineering, hs@denx.de * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <command.h> #include <i2c.h> #include <rtc.h> #define RTC_RV3029_CTRL1 0x00 #define RTC_RV3029_CTRL1_EERE (1 << 3) #define RTC_RV3029_CTRL_STATUS 0x03 #define RTC_RV3029_CTRLS_EEBUSY (1 << 7) #define RTC_RV3029_CTRL_RESET 0x04 #define RTC_RV3029_CTRL_SYS_R (1 << 4) #define RTC_RV3029_CLOCK_PAGE 0x08 #define RTC_RV3029_PAGE_LEN 7 #define RV3029C2_W_SECONDS 0x00 #define RV3029C2_W_MINUTES 0x01 #define RV3029C2_W_HOURS 0x02 #define RV3029C2_W_DATE 0x03 #define RV3029C2_W_DAYS 0x04 #define RV3029C2_W_MONTHS 0x05 #define RV3029C2_W_YEARS 0x06 #define RV3029C2_REG_HR_12_24 (1 << 6) /* 24h/12h mode */ #define RV3029C2_REG_HR_PM (1 << 5) /* PM/AM bit in 12h mode */ #define RTC_RV3029_EEPROM_CTRL 0x30 #define RTC_RV3029_TRICKLE_1K (1 << 4) #define RTC_RV3029_TRICKLE_5K (1 << 5) #define RTC_RV3029_TRICKLE_20K (1 << 6) #define RTC_RV3029_TRICKLE_80K (1 << 7) int rtc_get( struct rtc_time *tmp ) { int ret; unsigned char buf[RTC_RV3029_PAGE_LEN]; ret = i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, buf, \ RTC_RV3029_PAGE_LEN); if (ret) { printf("%s: error reading RTC: %x ", __func__, ret); return -1; } tmp->tm_sec = bcd2bin( buf[RV3029C2_W_SECONDS] & 0x7f); tmp->tm_min = bcd2bin( buf[RV3029C2_W_MINUTES] & 0x7f); if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_12_24) { /* 12h format */ tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x1f); if (buf[RV3029C2_W_HOURS] & RV3029C2_REG_HR_PM) /* PM flag set */ tmp->tm_hour += 12; } else tmp->tm_hour = bcd2bin(buf[RV3029C2_W_HOURS] & 0x3f); tmp->tm_mday = bcd2bin( buf[RV3029C2_W_DATE] & 0x3F ); tmp->tm_mon = bcd2bin( buf[RV3029C2_W_MONTHS] & 0x1F ); tmp->tm_wday = bcd2bin( buf[RV3029C2_W_DAYS] & 0x07 ); /* RTC supports only years > 1999 */ tmp->tm_year = bcd2bin( buf[RV3029C2_W_YEARS]) + 2000; tmp->tm_yday = 0; tmp->tm_isdst = 0; debug( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d ", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec ); return 0; } int rtc_set( struct rtc_time *tmp ) { int ret; unsigned char buf[RTC_RV3029_PAGE_LEN]; debug( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d ", tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, tmp->tm_hour, tmp->tm_min, tmp->tm_sec); if (tmp->tm_year < 2000) { printf("RTC: year %d < 2000 not possible ", tmp->tm_year); return -1; } buf[RV3029C2_W_SECONDS] = bin2bcd(tmp->tm_sec); buf[RV3029C2_W_MINUTES] = bin2bcd(tmp->tm_min); buf[RV3029C2_W_HOURS] = bin2bcd(tmp->tm_hour); /* set 24h format */ buf[RV3029C2_W_HOURS] &= ~RV3029C2_REG_HR_12_24; buf[RV3029C2_W_DATE] = bin2bcd(tmp->tm_mday); buf[RV3029C2_W_DAYS] = bin2bcd(tmp->tm_wday); buf[RV3029C2_W_MONTHS] = bin2bcd(tmp->tm_mon); tmp->tm_year -= 2000; buf[RV3029C2_W_YEARS] = bin2bcd(tmp->tm_year); ret = i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CLOCK_PAGE, 1, buf, RTC_RV3029_PAGE_LEN); /* give the RTC some time to update */ udelay(1000); return ret; } /* sets EERE-Bit (automatic EEPROM refresh) */ static void set_eere_bit(int state) { unsigned char reg_ctrl1; (void)i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL1, 1, ®_ctrl1, 1); if (state) reg_ctrl1 |= RTC_RV3029_CTRL1_EERE; else reg_ctrl1 &= (~RTC_RV3029_CTRL1_EERE); (void)i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL1, 1, ®_ctrl1, 1); } /* waits until EEPROM page is no longer busy (times out after 10ms*loops) */ static int wait_eebusy(int loops) { int i; unsigned char ctrl_status; for (i = 0; i < loops; i++) { (void)i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_STATUS, 1, &ctrl_status, 1); if ((ctrl_status & RTC_RV3029_CTRLS_EEBUSY) == 0) break; udelay(10000); } return i; } void rtc_reset (void) { unsigned char buf[RTC_RV3029_PAGE_LEN]; buf[0] = RTC_RV3029_CTRL_SYS_R; (void)i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_CTRL_RESET, 1, buf, 1); #if defined(CONFIG_SYS_RV3029_TCR) /* * because EEPROM_CTRL register is in EEPROM page it is necessary to * disable automatic EEPROM refresh and check if EEPROM is busy * before EEPORM_CTRL register may be accessed */ set_eere_bit(0); wait_eebusy(100); /* read current trickle charger setting */ (void)i2c_read(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_EEPROM_CTRL, 1, buf, 1); /* enable automatic EEPROM refresh again */ set_eere_bit(1); /* * to minimize EEPROM access write trickle charger setting only if it * differs from current value */ if ((buf[0] & 0xF0) != CONFIG_SYS_RV3029_TCR) { buf[0] = (buf[0] & 0x0F) | CONFIG_SYS_RV3029_TCR; /* * write trickle charger setting (disable autom. EEPROM * refresh and wait until EEPROM is idle) */ set_eere_bit(0); wait_eebusy(100); (void)i2c_write(CONFIG_SYS_I2C_RTC_ADDR, RTC_RV3029_EEPROM_CTRL, 1, buf, 1); /* * it is necessary to wait 10ms before EEBUSY-Bit may be read * (this is not documented in the data sheet yet, but the * manufacturer recommends it) */ udelay(10000); /* wait until EEPROM write access is finished */ wait_eebusy(100); set_eere_bit(1); } #endif } |