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3ced12a06b
This is actually required in order for a Linux kernel to boot successfully on a physical Malta board. Without enabling the RTC, a Malta Linux kernel will get stuck in its estimate_frequencies function on boot. Signed-off-by: Paul Burton <paul.burton@imgtec.com>
153 lines
3.9 KiB
C
153 lines
3.9 KiB
C
/*
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* (C) Copyright 2001
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* Denis Peter MPL AG Switzerland. d.peter@mpl.ch
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* Date & Time support for the MC146818 (PIXX4) RTC
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*/
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/*#define DEBUG*/
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#include <common.h>
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#include <command.h>
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#include <rtc.h>
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#if defined(__I386__) || defined(CONFIG_MALTA)
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#include <asm/io.h>
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#define in8(p) inb(p)
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#define out8(p, v) outb(v, p)
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#endif
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#if defined(CONFIG_CMD_DATE)
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static uchar rtc_read (uchar reg);
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static void rtc_write (uchar reg, uchar val);
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#define RTC_PORT_MC146818 CONFIG_SYS_ISA_IO_BASE_ADDRESS + 0x70
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#define RTC_SECONDS 0x00
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#define RTC_SECONDS_ALARM 0x01
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#define RTC_MINUTES 0x02
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#define RTC_MINUTES_ALARM 0x03
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#define RTC_HOURS 0x04
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#define RTC_HOURS_ALARM 0x05
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#define RTC_DAY_OF_WEEK 0x06
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#define RTC_DATE_OF_MONTH 0x07
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#define RTC_MONTH 0x08
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#define RTC_YEAR 0x09
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#define RTC_CONFIG_A 0x0A
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#define RTC_CONFIG_B 0x0B
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#define RTC_CONFIG_C 0x0C
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#define RTC_CONFIG_D 0x0D
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/* ------------------------------------------------------------------------- */
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int rtc_get (struct rtc_time *tmp)
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{
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uchar sec, min, hour, mday, wday, mon, year;
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/* here check if rtc can be accessed */
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while((rtc_read(RTC_CONFIG_A)&0x80)==0x80);
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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_DATE_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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#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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printf ( "Alarms: month: %02x hour: %02x min: %02x sec: %02x\n",
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rtc_read (RTC_CONFIG_D) & 0x3F,
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rtc_read (RTC_HOURS_ALARM),
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rtc_read (RTC_MINUTES_ALARM),
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rtc_read (RTC_SECONDS_ALARM) );
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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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#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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rtc_write(RTC_CONFIG_B,0x82); /* 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_DATE_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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rtc_write(RTC_CONFIG_B,0x02); /* 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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rtc_write(RTC_CONFIG_B,0x82); /* disables the RTC to update the regs */
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rtc_write(RTC_CONFIG_A,0x20); /* Normal OP */
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rtc_write(RTC_CONFIG_B,0x00);
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rtc_write(RTC_CONFIG_B,0x00);
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rtc_write(RTC_CONFIG_B,0x02); /* enables the RTC to update the regs */
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}
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/* ------------------------------------------------------------------------- */
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#ifdef CONFIG_SYS_RTC_REG_BASE_ADDR
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/*
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* use direct memory access
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*/
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static uchar rtc_read (uchar reg)
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{
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return(in8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg));
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}
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static void rtc_write (uchar reg, uchar val)
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{
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out8(CONFIG_SYS_RTC_REG_BASE_ADDR+reg, val);
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}
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#else
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static uchar rtc_read (uchar reg)
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{
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out8(RTC_PORT_MC146818,reg);
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return(in8(RTC_PORT_MC146818+1));
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}
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static void rtc_write (uchar reg, uchar val)
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{
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out8(RTC_PORT_MC146818,reg);
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out8(RTC_PORT_MC146818+1,val);
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}
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#endif
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#endif
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