2 * linux/arch/sh/boards/sh03/rtc.c -- CTP/PCI-SH03 on-chip RTC support
4 * Copyright (C) 2004 Saito.K & Jeanne(ksaito@interface.co.jp)
8 #include <linux/init.h>
9 #include <linux/kernel.h>
10 #include <linux/sched.h>
11 #include <linux/time.h>
13 #include <linux/rtc.h>
14 #include <linux/spinlock.h>
16 #define RTC_BASE 0xb0000000
17 #define RTC_SEC1 (RTC_BASE + 0)
18 #define RTC_SEC10 (RTC_BASE + 1)
19 #define RTC_MIN1 (RTC_BASE + 2)
20 #define RTC_MIN10 (RTC_BASE + 3)
21 #define RTC_HOU1 (RTC_BASE + 4)
22 #define RTC_HOU10 (RTC_BASE + 5)
23 #define RTC_WEE1 (RTC_BASE + 6)
24 #define RTC_DAY1 (RTC_BASE + 7)
25 #define RTC_DAY10 (RTC_BASE + 8)
26 #define RTC_MON1 (RTC_BASE + 9)
27 #define RTC_MON10 (RTC_BASE + 10)
28 #define RTC_YEA1 (RTC_BASE + 11)
29 #define RTC_YEA10 (RTC_BASE + 12)
30 #define RTC_YEA100 (RTC_BASE + 13)
31 #define RTC_YEA1000 (RTC_BASE + 14)
32 #define RTC_CTL (RTC_BASE + 15)
37 #define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10)
41 #define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10)
44 extern void (*rtc_get_time)(struct timespec *);
45 extern int (*rtc_set_time)(const time_t);
46 extern spinlock_t rtc_lock;
48 unsigned long get_cmos_time(void)
50 unsigned int year, mon, day, hour, min, sec;
55 sec = (ctrl_inb(RTC_SEC1) & 0xf) + (ctrl_inb(RTC_SEC10) & 0x7) * 10;
56 min = (ctrl_inb(RTC_MIN1) & 0xf) + (ctrl_inb(RTC_MIN10) & 0xf) * 10;
57 hour = (ctrl_inb(RTC_HOU1) & 0xf) + (ctrl_inb(RTC_HOU10) & 0xf) * 10;
58 day = (ctrl_inb(RTC_DAY1) & 0xf) + (ctrl_inb(RTC_DAY10) & 0xf) * 10;
59 mon = (ctrl_inb(RTC_MON1) & 0xf) + (ctrl_inb(RTC_MON10) & 0xf) * 10;
60 year = (ctrl_inb(RTC_YEA1) & 0xf) + (ctrl_inb(RTC_YEA10) & 0xf) * 10
61 + (ctrl_inb(RTC_YEA100 ) & 0xf) * 100
62 + (ctrl_inb(RTC_YEA1000) & 0xf) * 1000;
63 } while (sec != (ctrl_inb(RTC_SEC1) & 0xf) + (ctrl_inb(RTC_SEC10) & 0x7) * 10);
64 if (year == 0 || mon < 1 || mon > 12 || day > 31 || day < 1 ||
65 hour > 23 || min > 59 || sec > 59) {
67 "SH-03 RTC: invalid value, resetting to 1 Jan 2000\n");
68 printk("year=%d, mon=%d, day=%d, hour=%d, min=%d, sec=%d\n",
69 year, mon, day, hour, min, sec);
71 ctrl_outb(0, RTC_SEC1); ctrl_outb(0, RTC_SEC10);
72 ctrl_outb(0, RTC_MIN1); ctrl_outb(0, RTC_MIN10);
73 ctrl_outb(0, RTC_HOU1); ctrl_outb(0, RTC_HOU10);
74 ctrl_outb(6, RTC_WEE1);
75 ctrl_outb(1, RTC_DAY1); ctrl_outb(0, RTC_DAY10);
76 ctrl_outb(1, RTC_MON1); ctrl_outb(0, RTC_MON10);
77 ctrl_outb(0, RTC_YEA1); ctrl_outb(0, RTC_YEA10);
78 ctrl_outb(0, RTC_YEA100);
79 ctrl_outb(2, RTC_YEA1000);
80 ctrl_outb(0, RTC_CTL);
84 spin_unlock(&rtc_lock);
85 return mktime(year, mon, day, hour, min, sec);
88 void sh03_rtc_gettimeofday(struct timespec *tv)
91 tv->tv_sec = get_cmos_time();
95 static int set_rtc_mmss(unsigned long nowtime)
98 int real_seconds, real_minutes, cmos_minutes;
101 /* gets recalled with irq locally disabled */
102 spin_lock(&rtc_lock);
103 for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */
104 if (!(ctrl_inb(RTC_CTL) & RTC_BUSY))
106 cmos_minutes = (ctrl_inb(RTC_MIN1) & 0xf) + (ctrl_inb(RTC_MIN10) & 0xf) * 10;
107 real_seconds = nowtime % 60;
108 real_minutes = nowtime / 60;
109 if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
110 real_minutes += 30; /* correct for half hour time zone */
113 if (abs(real_minutes - cmos_minutes) < 30) {
114 ctrl_outb(real_seconds % 10, RTC_SEC1);
115 ctrl_outb(real_seconds / 10, RTC_SEC10);
116 ctrl_outb(real_minutes % 10, RTC_MIN1);
117 ctrl_outb(real_minutes / 10, RTC_MIN10);
120 "set_rtc_mmss: can't update from %d to %d\n",
121 cmos_minutes, real_minutes);
124 spin_unlock(&rtc_lock);
129 int sh03_rtc_settimeofday(const time_t secs)
131 unsigned long nowtime = secs;
133 return set_rtc_mmss(nowtime);
136 void sh03_time_init(void)
138 rtc_get_time = sh03_rtc_gettimeofday;
139 rtc_set_time = sh03_rtc_settimeofday;