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
15 #include <asm/irq.h>
16 #include <asm/io.h>
17 #include <asm/system.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 #define BCD_TO_BIN(val) (((val)&15) + ((val)>>4)*10)
40 #define BIN_TO_BCD(val) (((val/10) << 4) | (val % 10))
41
42 /* Read the Mostek */
sun3x_gettod(int * yearp,int * monp,int * dayp,int * hourp,int * minp,int * secp)43 void sun3x_gettod (int *yearp, int *monp, int *dayp,
44 int *hourp, int *minp, int *secp)
45 {
46 volatile unsigned char *eeprom = (unsigned char *)SUN3X_EEPROM;
47
48 /* Stop updates */
49 *(eeprom + M_CONTROL) |= C_READ;
50
51 /* Read values */
52 *yearp = BCD_TO_BIN(*(eeprom + M_YEAR));
53 *monp = BCD_TO_BIN(*(eeprom + M_MONTH)) +1;
54 *dayp = BCD_TO_BIN(*(eeprom + M_DATE));
55 *hourp = BCD_TO_BIN(*(eeprom + M_HOUR));
56 *minp = BCD_TO_BIN(*(eeprom + M_MIN));
57 *secp = BCD_TO_BIN(*(eeprom + M_SEC));
58
59 /* Restart updates */
60 *(eeprom + M_CONTROL) &= ~C_READ;
61 }
62
sun3x_hwclk(int set,struct rtc_time * t)63 int sun3x_hwclk(int set, struct rtc_time *t)
64 {
65 volatile struct mostek_dt *h =
66 (struct mostek_dt *)(SUN3X_EEPROM+M_CONTROL);
67 unsigned long flags;
68
69 save_and_cli(flags);
70
71 if(set) {
72 h->csr |= C_WRITE;
73 h->sec = BIN_TO_BCD(t->tm_sec);
74 h->min = BIN_TO_BCD(t->tm_min);
75 h->hour = BIN_TO_BCD(t->tm_hour);
76 h->wday = BIN_TO_BCD(t->tm_wday);
77 h->mday = BIN_TO_BCD(t->tm_mday);
78 h->month = BIN_TO_BCD(t->tm_mon);
79 h->year = BIN_TO_BCD(t->tm_year);
80 h->csr &= ~C_WRITE;
81 } else {
82 h->csr |= C_READ;
83 t->tm_sec = BCD_TO_BIN(h->sec);
84 t->tm_min = BCD_TO_BIN(h->min);
85 t->tm_hour = BCD_TO_BIN(h->hour);
86 t->tm_wday = BCD_TO_BIN(h->wday);
87 t->tm_mday = BCD_TO_BIN(h->mday);
88 t->tm_mon = BCD_TO_BIN(h->month);
89 t->tm_year = BCD_TO_BIN(h->year);
90 h->csr &= ~C_READ;
91 }
92
93 restore_flags(flags);
94
95 return 0;
96 }
97 /* Not much we can do here */
sun3x_gettimeoffset(void)98 unsigned long sun3x_gettimeoffset (void)
99 {
100 return 0L;
101 }
102
103 #if 0
104 static void sun3x_timer_tick(int irq, void *dev_id, struct pt_regs *regs)
105 {
106 void (*vector)(int, void *, struct pt_regs *) = dev_id;
107
108 /* Clear the pending interrupt - pulse the enable line low */
109 disable_irq(5);
110 enable_irq(5);
111
112 vector(irq, NULL, regs);
113 }
114 #endif
115
sun3x_sched_init(void (* vector)(int,void *,struct pt_regs *))116 void __init sun3x_sched_init(void (*vector)(int, void *, struct pt_regs *))
117 {
118
119 sun3_disable_interrupts();
120
121
122 /* Pulse enable low to get the clock started */
123 sun3_disable_irq(5);
124 sun3_enable_irq(5);
125 sun3_enable_interrupts();
126 }
127