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
40 int 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
78 static 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
93 void __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
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