arch/m68k/sun3x/time.c

   1 /*
   2  *  linux/arch/m68k/sun3x/time.c
   3  *
   4  *  Sun3x-specific time handling
   5  */
   6
   7 #include <linux/types.h>
   8 #include <linux/kd.h>
   9 #include <linux/init.h>
  10 #include <linux/sched.h>
  11 #include <linux/kernel_stat.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/rtc.h>
  14 #include <linux/bcd.h>
  15
  16 #include <asm/irq.h>
  17 #include <asm/io.h>
  18 #include <asm/traps.h>
  19 #include <asm/sun3x.h>
  20 #include <asm/sun3ints.h>
  21 #include <asm/rtc.h>
  22
  23 #include "time.h"
  24
  25 #define M_CONTROL 0xf8
  26 #define M_SEC     0xf9
  27 #define M_MIN     0xfa
  28 #define M_HOUR    0xfb
  29 #define M_DAY     0xfc
  30 #define M_DATE    0xfd
  31 #define M_MONTH   0xfe
  32 #define M_YEAR    0xff
  33
  34 #define C_WRITE   0x80
  35 #define C_READ    0x40
  36 #define C_SIGN    0x20
  37 #define C_CALIB   0x1f
  38
  39 int sun3x_hwclk(int set, struct rtc_time *t)
  40 {
  41         volatile struct mostek_dt *h =
  42                 (struct mostek_dt *)(SUN3X_EEPROM+M_CONTROL);
  43         unsigned long flags;
  44
  45         local_irq_save(flags);
  46
  47         if(set) {
  48                 h->csr |= C_WRITE;
  49                 h->sec = bin2bcd(t->tm_sec);
  50                 h->min = bin2bcd(t->tm_min);
  51                 h->hour = bin2bcd(t->tm_hour);
  52                 h->wday = bin2bcd(t->tm_wday);
  53                 h->mday = bin2bcd(t->tm_mday);
  54                 h->month = bin2bcd(t->tm_mon);
  55                 h->year = bin2bcd(t->tm_year);
  56                 h->csr &= ~C_WRITE;
  57         } else {
  58                 h->csr |= C_READ;
  59                 t->tm_sec = bcd2bin(h->sec);
  60                 t->tm_min = bcd2bin(h->min);
  61                 t->tm_hour = bcd2bin(h->hour);
  62                 t->tm_wday = bcd2bin(h->wday);
  63                 t->tm_mday = bcd2bin(h->mday);
  64                 t->tm_mon = bcd2bin(h->month);
  65                 t->tm_year = bcd2bin(h->year);
  66                 h->csr &= ~C_READ;
  67         }
  68
  69         local_irq_restore(flags);
  70
  71         return 0;
  72 }
  73 /* Not much we can do here */
  74 unsigned long sun3x_gettimeoffset (void)
  75 {
  76     return 0L;
  77 }
  78
  79 #if 0
  80 static void sun3x_timer_tick(int irq, void *dev_id, struct pt_regs *regs)
  81 {
  82     void (*vector)(int, void *, struct pt_regs *) = dev_id;
  83
  84     /* Clear the pending interrupt - pulse the enable line low */
  85     disable_irq(5);
  86     enable_irq(5);
  87
  88     vector(irq, NULL, regs);
  89 }
  90 #endif
  91
  92 void __init sun3x_sched_init(irq_handler_t vector)
  93 {
  94
  95         sun3_disable_interrupts();
  96
  97
  98     /* Pulse enable low to get the clock started */
  99         sun3_disable_irq(5);
 100         sun3_enable_irq(5);
 101         sun3_enable_interrupts();
 102 }