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https://github.com/brain-hackers/linux-brain.git
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b65769fc01
This fixes a bug in read_persistent_clock() which causes the system clock to lag the Real Time Clock by one month. The problem was noticed on a Mac, but theoretically it must also affect Atari, BVME6000 and Q40. The tm_mon value in the struct rtc_time passed to mach_hwclk() is zero-based, and atari_mste_hwclk(), atari_tt_hwclk(), bvme6000_hwclk(), mac_hwclk() and q40_hwclk() all make this adjustment. Unfortunately, dn_dummy_hwclk(), mvme147_hwclk(), mvme16x_hwclk(), sun3_hwclk() and sun3x_hwclk() fail to decrement tm_mon. Also m68328_hwclk() assumes a one-based tm_mon. Bring these platforms into line and fix read_persistent_clock() so it works correctly on all m68k platforms. The datasheets for the RTC devices found on the affected platforms all confirm that the year is stored as a value in the range 0-99 and the month is stored as a value in the range 1-12. Please refer to the datasheets for MC146818 (Apollo), DS1643 (MVME), ICM7170 (Sun 3) and M48T02 (Sun 3x). Reported-by: Stan Johnson <userm57@yahoo.com> Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
106 lines
2.1 KiB
C
106 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/m68k/sun3x/time.c
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*
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* Sun3x-specific time handling
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*/
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#include <linux/types.h>
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#include <linux/kd.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/kernel_stat.h>
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#include <linux/interrupt.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <asm/irq.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#include <asm/traps.h>
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#include <asm/sun3x.h>
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#include <asm/sun3ints.h>
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#include "time.h"
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#define M_CONTROL 0xf8
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#define M_SEC 0xf9
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#define M_MIN 0xfa
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#define M_HOUR 0xfb
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#define M_DAY 0xfc
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#define M_DATE 0xfd
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#define M_MONTH 0xfe
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#define M_YEAR 0xff
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#define C_WRITE 0x80
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#define C_READ 0x40
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#define C_SIGN 0x20
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#define C_CALIB 0x1f
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int sun3x_hwclk(int set, struct rtc_time *t)
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{
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volatile struct mostek_dt *h =
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(struct mostek_dt *)(SUN3X_EEPROM+M_CONTROL);
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unsigned long flags;
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local_irq_save(flags);
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if(set) {
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h->csr |= C_WRITE;
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h->sec = bin2bcd(t->tm_sec);
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h->min = bin2bcd(t->tm_min);
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h->hour = bin2bcd(t->tm_hour);
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h->wday = bin2bcd(t->tm_wday);
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h->mday = bin2bcd(t->tm_mday);
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h->month = bin2bcd(t->tm_mon + 1);
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h->year = bin2bcd(t->tm_year % 100);
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h->csr &= ~C_WRITE;
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} else {
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h->csr |= C_READ;
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t->tm_sec = bcd2bin(h->sec);
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t->tm_min = bcd2bin(h->min);
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t->tm_hour = bcd2bin(h->hour);
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t->tm_wday = bcd2bin(h->wday);
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t->tm_mday = bcd2bin(h->mday);
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t->tm_mon = bcd2bin(h->month) - 1;
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t->tm_year = bcd2bin(h->year);
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h->csr &= ~C_READ;
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if (t->tm_year < 70)
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t->tm_year += 100;
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}
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local_irq_restore(flags);
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return 0;
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}
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/* Not much we can do here */
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u32 sun3x_gettimeoffset(void)
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{
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return 0L;
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}
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#if 0
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static void sun3x_timer_tick(int irq, void *dev_id, struct pt_regs *regs)
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{
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void (*vector)(int, void *, struct pt_regs *) = dev_id;
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/* Clear the pending interrupt - pulse the enable line low */
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disable_irq(5);
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enable_irq(5);
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vector(irq, NULL, regs);
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}
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#endif
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void __init sun3x_sched_init(irq_handler_t vector)
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{
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sun3_disable_interrupts();
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/* Pulse enable low to get the clock started */
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sun3_disable_irq(5);
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sun3_enable_irq(5);
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sun3_enable_interrupts();
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}
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