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