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 
sun3x_hwclk(int set,struct rtc_time * t)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 /* Not much we can do here */
sun3x_gettimeoffset(void)77 u32 sun3x_gettimeoffset(void)
78 {
79     return 0L;
80 }
81 
82 #if 0
83 static void sun3x_timer_tick(int irq, void *dev_id, struct pt_regs *regs)
84 {
85     void (*vector)(int, void *, struct pt_regs *) = dev_id;
86 
87     /* Clear the pending interrupt - pulse the enable line low */
88     disable_irq(5);
89     enable_irq(5);
90 
91     vector(irq, NULL, regs);
92 }
93 #endif
94 
sun3x_sched_init(irq_handler_t vector)95 void __init sun3x_sched_init(irq_handler_t vector)
96 {
97 
98 	sun3_disable_interrupts();
99 
100 
101     /* Pulse enable low to get the clock started */
102 	sun3_disable_irq(5);
103 	sun3_enable_irq(5);
104 	sun3_enable_interrupts();
105 }
106