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