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