1*83d290c5STom Rini // SPDX-License-Identifier: GPL-2.0+ 20c698dcaSJean-Christophe PLAGNIOL-VILLARD /* 30c698dcaSJean-Christophe PLAGNIOL-VILLARD * (C) Copyright 2004 40c698dcaSJean-Christophe PLAGNIOL-VILLARD * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 50c698dcaSJean-Christophe PLAGNIOL-VILLARD */ 60c698dcaSJean-Christophe PLAGNIOL-VILLARD 70c698dcaSJean-Christophe PLAGNIOL-VILLARD /* 80c698dcaSJean-Christophe PLAGNIOL-VILLARD * Date & Time support for MAXIM MAX6900 RTC 90c698dcaSJean-Christophe PLAGNIOL-VILLARD */ 100c698dcaSJean-Christophe PLAGNIOL-VILLARD 110c698dcaSJean-Christophe PLAGNIOL-VILLARD /* #define DEBUG */ 120c698dcaSJean-Christophe PLAGNIOL-VILLARD 130c698dcaSJean-Christophe PLAGNIOL-VILLARD #include <common.h> 140c698dcaSJean-Christophe PLAGNIOL-VILLARD #include <command.h> 150c698dcaSJean-Christophe PLAGNIOL-VILLARD #include <rtc.h> 160c698dcaSJean-Christophe PLAGNIOL-VILLARD #include <i2c.h> 170c698dcaSJean-Christophe PLAGNIOL-VILLARD 18871c18ddSMichal Simek #if defined(CONFIG_CMD_DATE) 190c698dcaSJean-Christophe PLAGNIOL-VILLARD 206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #ifndef CONFIG_SYS_I2C_RTC_ADDR 216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_I2C_RTC_ADDR 0x50 220c698dcaSJean-Christophe PLAGNIOL-VILLARD #endif 230c698dcaSJean-Christophe PLAGNIOL-VILLARD 240c698dcaSJean-Christophe PLAGNIOL-VILLARD /* ------------------------------------------------------------------------- */ 250c698dcaSJean-Christophe PLAGNIOL-VILLARD 260c698dcaSJean-Christophe PLAGNIOL-VILLARD static uchar rtc_read (uchar reg) 270c698dcaSJean-Christophe PLAGNIOL-VILLARD { 286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg)); 290c698dcaSJean-Christophe PLAGNIOL-VILLARD } 300c698dcaSJean-Christophe PLAGNIOL-VILLARD 310c698dcaSJean-Christophe PLAGNIOL-VILLARD static void rtc_write (uchar reg, uchar val) 320c698dcaSJean-Christophe PLAGNIOL-VILLARD { 336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val); 340c698dcaSJean-Christophe PLAGNIOL-VILLARD udelay(2500); 350c698dcaSJean-Christophe PLAGNIOL-VILLARD } 360c698dcaSJean-Christophe PLAGNIOL-VILLARD 370c698dcaSJean-Christophe PLAGNIOL-VILLARD /* ------------------------------------------------------------------------- */ 380c698dcaSJean-Christophe PLAGNIOL-VILLARD 39b73a19e1SYuri Tikhonov int rtc_get (struct rtc_time *tmp) 400c698dcaSJean-Christophe PLAGNIOL-VILLARD { 410c698dcaSJean-Christophe PLAGNIOL-VILLARD uchar sec, min, hour, mday, wday, mon, cent, year; 420c698dcaSJean-Christophe PLAGNIOL-VILLARD int retry = 1; 430c698dcaSJean-Christophe PLAGNIOL-VILLARD 440c698dcaSJean-Christophe PLAGNIOL-VILLARD do { 450c698dcaSJean-Christophe PLAGNIOL-VILLARD sec = rtc_read (0x80); 460c698dcaSJean-Christophe PLAGNIOL-VILLARD min = rtc_read (0x82); 470c698dcaSJean-Christophe PLAGNIOL-VILLARD hour = rtc_read (0x84); 480c698dcaSJean-Christophe PLAGNIOL-VILLARD mday = rtc_read (0x86); 490c698dcaSJean-Christophe PLAGNIOL-VILLARD mon = rtc_read (0x88); 500c698dcaSJean-Christophe PLAGNIOL-VILLARD wday = rtc_read (0x8a); 510c698dcaSJean-Christophe PLAGNIOL-VILLARD year = rtc_read (0x8c); 520c698dcaSJean-Christophe PLAGNIOL-VILLARD cent = rtc_read (0x92); 530c698dcaSJean-Christophe PLAGNIOL-VILLARD /* 540c698dcaSJean-Christophe PLAGNIOL-VILLARD * Check for seconds rollover 550c698dcaSJean-Christophe PLAGNIOL-VILLARD */ 560c698dcaSJean-Christophe PLAGNIOL-VILLARD if ((sec != 59) || (rtc_read(0x80) == sec)){ 570c698dcaSJean-Christophe PLAGNIOL-VILLARD retry = 0; 580c698dcaSJean-Christophe PLAGNIOL-VILLARD } 590c698dcaSJean-Christophe PLAGNIOL-VILLARD } while (retry); 600c698dcaSJean-Christophe PLAGNIOL-VILLARD 610c698dcaSJean-Christophe PLAGNIOL-VILLARD debug ( "Get RTC year: %02x mon: %02x cent: %02x mday: %02x wday: %02x " 620c698dcaSJean-Christophe PLAGNIOL-VILLARD "hr: %02x min: %02x sec: %02x\n", 630c698dcaSJean-Christophe PLAGNIOL-VILLARD year, mon, cent, mday, wday, 640c698dcaSJean-Christophe PLAGNIOL-VILLARD hour, min, sec ); 650c698dcaSJean-Christophe PLAGNIOL-VILLARD 660c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_sec = bcd2bin (sec & 0x7F); 670c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_min = bcd2bin (min & 0x7F); 680c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_hour = bcd2bin (hour & 0x3F); 690c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_mday = bcd2bin (mday & 0x3F); 700c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_mon = bcd2bin (mon & 0x1F); 710c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_year = bcd2bin (year) + bcd2bin(cent) * 100; 720c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_wday = bcd2bin (wday & 0x07); 730c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_yday = 0; 740c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_isdst= 0; 750c698dcaSJean-Christophe PLAGNIOL-VILLARD 760c698dcaSJean-Christophe PLAGNIOL-VILLARD debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 770c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 780c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 79b73a19e1SYuri Tikhonov 80b73a19e1SYuri Tikhonov return 0; 810c698dcaSJean-Christophe PLAGNIOL-VILLARD } 820c698dcaSJean-Christophe PLAGNIOL-VILLARD 83d1e23194SJean-Christophe PLAGNIOL-VILLARD int rtc_set (struct rtc_time *tmp) 840c698dcaSJean-Christophe PLAGNIOL-VILLARD { 850c698dcaSJean-Christophe PLAGNIOL-VILLARD 860c698dcaSJean-Christophe PLAGNIOL-VILLARD debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 870c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 880c698dcaSJean-Christophe PLAGNIOL-VILLARD tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 890c698dcaSJean-Christophe PLAGNIOL-VILLARD 900c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x9E, 0x00); 910c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x80, 0); /* Clear seconds to ensure no rollover */ 920c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x92, bin2bcd(tmp->tm_year / 100)); 930c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x8c, bin2bcd(tmp->tm_year % 100)); 940c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x8a, bin2bcd(tmp->tm_wday)); 950c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x88, bin2bcd(tmp->tm_mon)); 960c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x86, bin2bcd(tmp->tm_mday)); 970c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x84, bin2bcd(tmp->tm_hour)); 980c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x82, bin2bcd(tmp->tm_min )); 990c698dcaSJean-Christophe PLAGNIOL-VILLARD rtc_write (0x80, bin2bcd(tmp->tm_sec )); 100d1e23194SJean-Christophe PLAGNIOL-VILLARD 101d1e23194SJean-Christophe PLAGNIOL-VILLARD return 0; 1020c698dcaSJean-Christophe PLAGNIOL-VILLARD } 1030c698dcaSJean-Christophe PLAGNIOL-VILLARD 1040c698dcaSJean-Christophe PLAGNIOL-VILLARD void rtc_reset (void) 1050c698dcaSJean-Christophe PLAGNIOL-VILLARD { 1060c698dcaSJean-Christophe PLAGNIOL-VILLARD } 1070c698dcaSJean-Christophe PLAGNIOL-VILLARD 1080c698dcaSJean-Christophe PLAGNIOL-VILLARD #endif 109