1 /* 2 * linux/arch/sh/boards/sh03/rtc.c -- CTP/PCI-SH03 on-chip RTC support 3 * 4 * Copyright (C) 2004 Saito.K & Jeanne(ksaito@interface.co.jp) 5 * 6 */ 7 8 #include <linux/init.h> 9 #include <linux/kernel.h> 10 #include <linux/sched.h> 11 #include <linux/time.h> 12 #include <linux/bcd.h> 13 #include <linux/rtc.h> 14 #include <linux/spinlock.h> 15 #include <asm/io.h> 16 #include <asm/rtc.h> 17 18 #define RTC_BASE 0xb0000000 19 #define RTC_SEC1 (RTC_BASE + 0) 20 #define RTC_SEC10 (RTC_BASE + 1) 21 #define RTC_MIN1 (RTC_BASE + 2) 22 #define RTC_MIN10 (RTC_BASE + 3) 23 #define RTC_HOU1 (RTC_BASE + 4) 24 #define RTC_HOU10 (RTC_BASE + 5) 25 #define RTC_WEE1 (RTC_BASE + 6) 26 #define RTC_DAY1 (RTC_BASE + 7) 27 #define RTC_DAY10 (RTC_BASE + 8) 28 #define RTC_MON1 (RTC_BASE + 9) 29 #define RTC_MON10 (RTC_BASE + 10) 30 #define RTC_YEA1 (RTC_BASE + 11) 31 #define RTC_YEA10 (RTC_BASE + 12) 32 #define RTC_YEA100 (RTC_BASE + 13) 33 #define RTC_YEA1000 (RTC_BASE + 14) 34 #define RTC_CTL (RTC_BASE + 15) 35 #define RTC_BUSY 1 36 #define RTC_STOP 2 37 38 static DEFINE_SPINLOCK(sh03_rtc_lock); 39 40 unsigned long get_cmos_time(void) 41 { 42 unsigned int year, mon, day, hour, min, sec; 43 44 spin_lock(&sh03_rtc_lock); 45 again: 46 do { 47 sec = (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10; 48 min = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10; 49 hour = (__raw_readb(RTC_HOU1) & 0xf) + (__raw_readb(RTC_HOU10) & 0xf) * 10; 50 day = (__raw_readb(RTC_DAY1) & 0xf) + (__raw_readb(RTC_DAY10) & 0xf) * 10; 51 mon = (__raw_readb(RTC_MON1) & 0xf) + (__raw_readb(RTC_MON10) & 0xf) * 10; 52 year = (__raw_readb(RTC_YEA1) & 0xf) + (__raw_readb(RTC_YEA10) & 0xf) * 10 53 + (__raw_readb(RTC_YEA100 ) & 0xf) * 100 54 + (__raw_readb(RTC_YEA1000) & 0xf) * 1000; 55 } while (sec != (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10); 56 if (year == 0 || mon < 1 || mon > 12 || day > 31 || day < 1 || 57 hour > 23 || min > 59 || sec > 59) { 58 printk(KERN_ERR 59 "SH-03 RTC: invalid value, resetting to 1 Jan 2000\n"); 60 printk("year=%d, mon=%d, day=%d, hour=%d, min=%d, sec=%d\n", 61 year, mon, day, hour, min, sec); 62 63 __raw_writeb(0, RTC_SEC1); __raw_writeb(0, RTC_SEC10); 64 __raw_writeb(0, RTC_MIN1); __raw_writeb(0, RTC_MIN10); 65 __raw_writeb(0, RTC_HOU1); __raw_writeb(0, RTC_HOU10); 66 __raw_writeb(6, RTC_WEE1); 67 __raw_writeb(1, RTC_DAY1); __raw_writeb(0, RTC_DAY10); 68 __raw_writeb(1, RTC_MON1); __raw_writeb(0, RTC_MON10); 69 __raw_writeb(0, RTC_YEA1); __raw_writeb(0, RTC_YEA10); 70 __raw_writeb(0, RTC_YEA100); 71 __raw_writeb(2, RTC_YEA1000); 72 __raw_writeb(0, RTC_CTL); 73 goto again; 74 } 75 76 spin_unlock(&sh03_rtc_lock); 77 return mktime(year, mon, day, hour, min, sec); 78 } 79 80 void sh03_rtc_gettimeofday(struct timespec *tv) 81 { 82 83 tv->tv_sec = get_cmos_time(); 84 tv->tv_nsec = 0; 85 } 86 87 static int set_rtc_mmss(unsigned long nowtime) 88 { 89 int retval = 0; 90 int real_seconds, real_minutes, cmos_minutes; 91 int i; 92 93 /* gets recalled with irq locally disabled */ 94 spin_lock(&sh03_rtc_lock); 95 for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */ 96 if (!(__raw_readb(RTC_CTL) & RTC_BUSY)) 97 break; 98 cmos_minutes = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10; 99 real_seconds = nowtime % 60; 100 real_minutes = nowtime / 60; 101 if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1) 102 real_minutes += 30; /* correct for half hour time zone */ 103 real_minutes %= 60; 104 105 if (abs(real_minutes - cmos_minutes) < 30) { 106 __raw_writeb(real_seconds % 10, RTC_SEC1); 107 __raw_writeb(real_seconds / 10, RTC_SEC10); 108 __raw_writeb(real_minutes % 10, RTC_MIN1); 109 __raw_writeb(real_minutes / 10, RTC_MIN10); 110 } else { 111 printk_once(KERN_NOTICE 112 "set_rtc_mmss: can't update from %d to %d\n", 113 cmos_minutes, real_minutes); 114 retval = -1; 115 } 116 spin_unlock(&sh03_rtc_lock); 117 118 return retval; 119 } 120 121 int sh03_rtc_settimeofday(const time_t secs) 122 { 123 unsigned long nowtime = secs; 124 125 return set_rtc_mmss(nowtime); 126 } 127 128 void sh03_time_init(void) 129 { 130 rtc_sh_get_time = sh03_rtc_gettimeofday; 131 rtc_sh_set_time = sh03_rtc_settimeofday; 132 } 133