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175 lines
3.9 KiB
175 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> |
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* Andreas Heppel <[email protected]> |
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*/ |
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/* |
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* Date & Time support for the MK48T59 RTC |
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*/ |
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#undef RTC_DEBUG |
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#include <common.h> |
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#include <command.h> |
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#include <config.h> |
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#include <rtc.h> |
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#include <mk48t59.h> |
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#if defined(CONFIG_BAB7xx) |
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static uchar rtc_read (short reg) |
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{ |
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out8(RTC_PORT_ADDR0, reg & 0xFF); |
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out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF); |
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return in8(RTC_PORT_DATA); |
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} |
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static void rtc_write (short reg, uchar val) |
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{ |
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out8(RTC_PORT_ADDR0, reg & 0xFF); |
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out8(RTC_PORT_ADDR1, (reg>>8) & 0xFF); |
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out8(RTC_PORT_DATA, val); |
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} |
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#elif defined(CONFIG_EVAL5200) |
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static uchar rtc_read (short reg) |
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{ |
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return in8(RTC(reg)); |
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} |
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static void rtc_write (short reg, uchar val) |
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{ |
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out8(RTC(reg),val); |
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} |
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#else |
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# error Board specific rtc access functions should be supplied |
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#endif |
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/* ------------------------------------------------------------------------- */ |
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void *nvram_read(void *dest, const short src, size_t count) |
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{ |
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uchar *d = (uchar *) dest; |
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short s = src; |
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while (count--) |
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*d++ = rtc_read(s++); |
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return dest; |
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} |
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void nvram_write(short dest, const void *src, size_t count) |
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{ |
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short d = dest; |
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uchar *s = (uchar *) src; |
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while (count--) |
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rtc_write(d++, *s++); |
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} |
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/* ------------------------------------------------------------------------- */ |
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int rtc_get (struct rtc_time *tmp) |
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{ |
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uchar save_ctrl_a; |
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uchar sec, min, hour, mday, wday, mon, year; |
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/* Simple: freeze the clock, read it and allow updates again */ |
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save_ctrl_a = rtc_read(RTC_CONTROLA); |
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/* Set the register to read the value. */ |
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save_ctrl_a |= RTC_CA_READ; |
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rtc_write(RTC_CONTROLA, save_ctrl_a); |
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sec = rtc_read (RTC_SECONDS); |
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min = rtc_read (RTC_MINUTES); |
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hour = rtc_read (RTC_HOURS); |
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mday = rtc_read (RTC_DAY_OF_MONTH); |
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wday = rtc_read (RTC_DAY_OF_WEEK); |
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mon = rtc_read (RTC_MONTH); |
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year = rtc_read (RTC_YEAR); |
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/* re-enable update */ |
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save_ctrl_a &= ~RTC_CA_READ; |
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rtc_write(RTC_CONTROLA, save_ctrl_a); |
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#ifdef RTC_DEBUG |
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printf ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x " |
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"hr: %02x min: %02x sec: %02x\n", |
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year, mon, mday, wday, |
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hour, min, sec ); |
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#endif |
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tmp->tm_sec = bcd2bin (sec & 0x7F); |
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tmp->tm_min = bcd2bin (min & 0x7F); |
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tmp->tm_hour = bcd2bin (hour & 0x3F); |
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tmp->tm_mday = bcd2bin (mday & 0x3F); |
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tmp->tm_mon = bcd2bin (mon & 0x1F); |
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tmp->tm_year = bcd2bin (year); |
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tmp->tm_wday = bcd2bin (wday & 0x07); |
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if(tmp->tm_year<70) |
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tmp->tm_year+=2000; |
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else |
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tmp->tm_year+=1900; |
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tmp->tm_yday = 0; |
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tmp->tm_isdst= 0; |
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#ifdef RTC_DEBUG |
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printf ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
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#endif |
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return 0; |
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} |
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int rtc_set (struct rtc_time *tmp) |
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{ |
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uchar save_ctrl_a; |
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#ifdef RTC_DEBUG |
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printf ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", |
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, |
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec); |
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#endif |
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save_ctrl_a = rtc_read(RTC_CONTROLA); |
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save_ctrl_a |= RTC_CA_WRITE; |
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rtc_write(RTC_CONTROLA, save_ctrl_a); /* disables the RTC to update the regs */ |
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rtc_write (RTC_YEAR, bin2bcd(tmp->tm_year % 100)); |
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rtc_write (RTC_MONTH, bin2bcd(tmp->tm_mon)); |
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rtc_write (RTC_DAY_OF_WEEK, bin2bcd(tmp->tm_wday)); |
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rtc_write (RTC_DAY_OF_MONTH, bin2bcd(tmp->tm_mday)); |
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rtc_write (RTC_HOURS, bin2bcd(tmp->tm_hour)); |
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rtc_write (RTC_MINUTES, bin2bcd(tmp->tm_min )); |
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rtc_write (RTC_SECONDS, bin2bcd(tmp->tm_sec )); |
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save_ctrl_a &= ~RTC_CA_WRITE; |
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rtc_write(RTC_CONTROLA, save_ctrl_a); /* enables the RTC to update the regs */ |
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return 0; |
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} |
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void rtc_reset (void) |
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{ |
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uchar control_b; |
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/* |
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* Start oscillator here. |
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*/ |
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control_b = rtc_read(RTC_CONTROLB); |
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control_b &= ~RTC_CB_STOP; |
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rtc_write(RTC_CONTROLB, control_b); |
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} |
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void rtc_set_watchdog(short multi, short res) |
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{ |
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uchar wd_value; |
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wd_value = RTC_WDS | ((multi & 0x1F) << 2) | (res & 0x3); |
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rtc_write(RTC_WATCHDOG, wd_value); |
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}
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