LXR linux/arch/m68k/sun3x/time.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  linux/arch/m68k/sun3x/time.c
   4 *
   5 *  Sun3x-specific time handling
   6 */
   7
   8#include <linux/types.h>
   9#include <linux/kd.h>
  10#include <linux/init.h>
  11#include <linux/sched.h>
  12#include <linux/kernel_stat.h>
  13#include <linux/interrupt.h>
  14#include <linux/rtc.h>
  15#include <linux/bcd.h>
  16
  17#include <asm/irq.h>
  18#include <asm/io.h>
  19#include <asm/machdep.h>
  20#include <asm/traps.h>
  21#include <asm/sun3x.h>
  22#include <asm/sun3ints.h>
  23
  24#include "time.h"
  25
  26#define M_CONTROL 0xf8
  27#define M_SEC     0xf9
  28#define M_MIN     0xfa
  29#define M_HOUR    0xfb
  30#define M_DAY     0xfc
  31#define M_DATE    0xfd
  32#define M_MONTH   0xfe
  33#define M_YEAR    0xff
  34
  35#define C_WRITE   0x80
  36#define C_READ    0x40
  37#define C_SIGN    0x20
  38#define C_CALIB   0x1f
  39
  40int sun3x_hwclk(int set, struct rtc_time *t)
  41{
  42        volatile struct mostek_dt *h =
  43                (struct mostek_dt *)(SUN3X_EEPROM+M_CONTROL);
  44        unsigned long flags;
  45
  46        local_irq_save(flags);
  47
  48        if(set) {
  49                h->csr |= C_WRITE;
  50                h->sec = bin2bcd(t->tm_sec);
  51                h->min = bin2bcd(t->tm_min);
  52                h->hour = bin2bcd(t->tm_hour);
  53                h->wday = bin2bcd(t->tm_wday);
  54                h->mday = bin2bcd(t->tm_mday);
  55                h->month = bin2bcd(t->tm_mon + 1);
  56                h->year = bin2bcd(t->tm_year % 100);
  57                h->csr &= ~C_WRITE;
  58        } else {
  59                h->csr |= C_READ;
  60                t->tm_sec = bcd2bin(h->sec);
  61                t->tm_min = bcd2bin(h->min);
  62                t->tm_hour = bcd2bin(h->hour);
  63                t->tm_wday = bcd2bin(h->wday);
  64                t->tm_mday = bcd2bin(h->mday);
  65                t->tm_mon = bcd2bin(h->month) - 1;
  66                t->tm_year = bcd2bin(h->year);
  67                h->csr &= ~C_READ;
  68                if (t->tm_year < 70)
  69                        t->tm_year += 100;
  70        }
  71
  72        local_irq_restore(flags);
  73
  74        return 0;
  75}
  76
  77#if 0
  78static irqreturn_t sun3x_timer_tick(int irq, void *dev_id)
  79{
  80        unsigned long flags;
  81
  82        local_irq_save(flags);
  83        /* Clear the pending interrupt - pulse the enable line low */
  84        disable_irq(5);
  85        enable_irq(5);
  86        legacy_timer_tick(1);
  87        local_irq_restore(flags);
  88
  89        return IRQ_HANDLED;
  90}
  91#endif
  92
  93void __init sun3x_sched_init(void)
  94{
  95
  96        sun3_disable_interrupts();
  97
  98
  99    /* Pulse enable low to get the clock started */
 100        sun3_disable_irq(5);
 101        sun3_enable_irq(5);
 102        sun3_enable_interrupts();
 103}
 104