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drivers/rtc/rx8025.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * (C) Copyright 2007 * Matthias Fuchs, esd gmbh, matthias.fuchs@esd-electronics.com. |
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*/ /* * Epson RX8025 RTC driver. */ #include <common.h> #include <command.h> #include <rtc.h> #include <i2c.h> |
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/*---------------------------------------------------------------------*/ #undef DEBUG_RTC #ifdef DEBUG_RTC #define DEBUGR(fmt,args...) printf(fmt ,##args) #else #define DEBUGR(fmt,args...) #endif /*---------------------------------------------------------------------*/ |
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#ifndef CONFIG_SYS_I2C_RTC_ADDR # define CONFIG_SYS_I2C_RTC_ADDR 0x32 |
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#endif /* * RTC register addresses */ #define RTC_SEC_REG_ADDR 0x00 #define RTC_MIN_REG_ADDR 0x01 #define RTC_HR_REG_ADDR 0x02 #define RTC_DAY_REG_ADDR 0x03 #define RTC_DATE_REG_ADDR 0x04 #define RTC_MON_REG_ADDR 0x05 #define RTC_YR_REG_ADDR 0x06 #define RTC_CTL1_REG_ADDR 0x0e #define RTC_CTL2_REG_ADDR 0x0f /* * Control register 1 bits */ #define RTC_CTL1_BIT_2412 0x20 /* * Control register 2 bits */ #define RTC_CTL2_BIT_PON 0x10 #define RTC_CTL2_BIT_VDET 0x40 #define RTC_CTL2_BIT_XST 0x20 #define RTC_CTL2_BIT_VDSL 0x80 /* * Note: the RX8025 I2C RTC requires register * reads and write to consist of a single bus * cycle. It is not allowed to write the register * address in a first cycle that is terminated by * a STOP condition. The chips needs a 'restart' * sequence (start sequence without a prior stop). * This driver has been written for a 4xx board. * U-Boot's 4xx i2c driver is currently not capable * to generate such cycles to some work arounds * are used. */ /* static uchar rtc_read (uchar reg); */ #define rtc_read(reg) buf[((reg) + 1) & 0xf] static void rtc_write (uchar reg, uchar val); |
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/* * Get the current time from the RTC */ |
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int rtc_get (struct rtc_time *tmp) |
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{ |
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int rel = 0; |
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uchar sec, min, hour, mday, wday, mon, year, ctl2; uchar buf[16]; |
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if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16)) |
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printf("Error reading from RTC "); sec = rtc_read(RTC_SEC_REG_ADDR); min = rtc_read(RTC_MIN_REG_ADDR); hour = rtc_read(RTC_HR_REG_ADDR); wday = rtc_read(RTC_DAY_REG_ADDR); mday = rtc_read(RTC_DATE_REG_ADDR); mon = rtc_read(RTC_MON_REG_ADDR); year = rtc_read(RTC_YR_REG_ADDR); DEBUGR ("Get RTC year: %02x mon: %02x mday: %02x wday: %02x " "hr: %02x min: %02x sec: %02x ", year, mon, mday, wday, hour, min, sec); /* dump status */ ctl2 = rtc_read(RTC_CTL2_REG_ADDR); |
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if (ctl2 & RTC_CTL2_BIT_PON) { |
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printf("RTC: power-on detected "); |
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rel = -1; } |
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if (ctl2 & RTC_CTL2_BIT_VDET) { |
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printf("RTC: voltage drop detected "); |
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rel = -1; } |
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if (!(ctl2 & RTC_CTL2_BIT_XST)) { |
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printf("RTC: oscillator stop detected "); |
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rel = -1; } |
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tmp->tm_sec = bcd2bin (sec & 0x7F); tmp->tm_min = bcd2bin (min & 0x7F); |
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if (rtc_read(RTC_CTL1_REG_ADDR) & RTC_CTL1_BIT_2412) tmp->tm_hour = bcd2bin (hour & 0x3F); else tmp->tm_hour = bcd2bin (hour & 0x1F) % 12 + ((hour & 0x20) ? 12 : 0); |
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tmp->tm_mday = bcd2bin (mday & 0x3F); tmp->tm_mon = bcd2bin (mon & 0x1F); tmp->tm_year = bcd2bin (year) + ( bcd2bin (year) >= 70 ? 1900 : 2000); tmp->tm_wday = bcd2bin (wday & 0x07); tmp->tm_yday = 0; tmp->tm_isdst= 0; DEBUGR ("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); |
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return rel; |
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} |
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/* * Set the RTC */ |
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int rtc_set (struct rtc_time *tmp) |
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{ DEBUGR ("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 < 1970 || tmp->tm_year > 2069) printf("WARNING: year should be between 1970 and 2069! "); rtc_write (RTC_YR_REG_ADDR, bin2bcd (tmp->tm_year % 100)); rtc_write (RTC_MON_REG_ADDR, bin2bcd (tmp->tm_mon)); rtc_write (RTC_DAY_REG_ADDR, bin2bcd (tmp->tm_wday)); rtc_write (RTC_DATE_REG_ADDR, bin2bcd (tmp->tm_mday)); rtc_write (RTC_HR_REG_ADDR, bin2bcd (tmp->tm_hour)); rtc_write (RTC_MIN_REG_ADDR, bin2bcd (tmp->tm_min)); rtc_write (RTC_SEC_REG_ADDR, bin2bcd (tmp->tm_sec)); rtc_write (RTC_CTL1_REG_ADDR, RTC_CTL1_BIT_2412); |
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return 0; |
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} |
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/* |
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* Reset the RTC |
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*/ void rtc_reset (void) { |
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uchar buf[16]; uchar ctl2; |
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if (i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 16)) |
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printf("Error reading from RTC "); ctl2 = rtc_read(RTC_CTL2_REG_ADDR); ctl2 &= ~(RTC_CTL2_BIT_PON | RTC_CTL2_BIT_VDET); ctl2 |= RTC_CTL2_BIT_XST | RTC_CTL2_BIT_VDSL; rtc_write (RTC_CTL2_REG_ADDR, ctl2); |
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} |
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/* * Helper functions */ static void rtc_write (uchar reg, uchar val) { uchar buf[2]; buf[0] = reg << 4; buf[1] = val; |
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if (i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 0, buf, 2) != 0) |
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printf("Error writing to RTC "); } |