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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Andreas Heppel <aheppel@sysgo.de>
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* SPDX-License-Identifier: GPL-2.0+
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* Date & Time support for the MK48T59 RTC
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#if defined(CONFIG_BAB7xx)
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static uchar rtc_read (short reg)
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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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static void rtc_write (short reg, uchar val)
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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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#elif defined(CONFIG_EVAL5200)
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static uchar rtc_read (short reg)
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static void rtc_write (short reg, uchar val)
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# error Board specific rtc access functions should be supplied
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/* ------------------------------------------------------------------------- */
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void *nvram_read(void *dest, const short src, size_t count)
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uchar *d = (uchar *) dest;
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void nvram_write(short dest, const void *src, size_t count)
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uchar *s = (uchar *) src;
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#if defined(CONFIG_CMD_DATE)
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/* ------------------------------------------------------------------------- */
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int rtc_get (struct rtc_time *tmp)
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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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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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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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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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int rtc_set (struct rtc_time *tmp)
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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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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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void rtc_reset (void)
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* Start oscillator here.
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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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void rtc_set_watchdog(short multi, short res)
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wd_value = RTC_WDS | ((multi & 0x1F) << 2) | (res & 0x3);
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rtc_write(RTC_WATCHDOG, wd_value);