rtc.c revision 1da177e4c3f41524e886b7f1b8a0c1fc7321cac
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * linux/arch/sh/boards/sh03/rtc.c -- CTP/PCI-SH03 on-chip RTC support 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 2004 Saito.K & Jeanne(ksaito@interface.co.jp) 51da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/init.h> 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/sched.h> 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/time.h> 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/io.h> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/rtc.h> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/spinlock.h> 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_BASE 0xb0000000 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_SEC1 (RTC_BASE + 0) 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_SEC10 (RTC_BASE + 1) 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_MIN1 (RTC_BASE + 2) 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_MIN10 (RTC_BASE + 3) 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_HOU1 (RTC_BASE + 4) 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_HOU10 (RTC_BASE + 5) 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_WEE1 (RTC_BASE + 6) 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_DAY1 (RTC_BASE + 7) 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_DAY10 (RTC_BASE + 8) 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_MON1 (RTC_BASE + 9) 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_MON10 (RTC_BASE + 10) 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_YEA1 (RTC_BASE + 11) 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_YEA10 (RTC_BASE + 12) 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_YEA100 (RTC_BASE + 13) 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_YEA1000 (RTC_BASE + 14) 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_CTL (RTC_BASE + 15) 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_BUSY 1 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_STOP 2 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef BCD_TO_BIN 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define BCD_TO_BIN(val) ((val)=((val)&15) + ((val)>>4)*10) 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifndef BIN_TO_BCD 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define BIN_TO_BCD(val) ((val)=(((val)/10)<<4) + (val)%10) 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsextern void (*rtc_get_time)(struct timespec *); 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsextern int (*rtc_set_time)(const time_t); 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsextern spinlock_t rtc_lock; 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsunsigned long get_cmos_time(void) 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int year, mon, day, hour, min, sec; 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&rtc_lock); 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds again: 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */ 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(ctrl_inb(RTC_CTL) & RTC_BUSY)) 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sec = (ctrl_inb(RTC_SEC1) & 0xf) + (ctrl_inb(RTC_SEC10) & 0x7) * 10; 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds min = (ctrl_inb(RTC_MIN1) & 0xf) + (ctrl_inb(RTC_MIN10) & 0xf) * 10; 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hour = (ctrl_inb(RTC_HOU1) & 0xf) + (ctrl_inb(RTC_HOU10) & 0xf) * 10; 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds day = (ctrl_inb(RTC_DAY1) & 0xf) + (ctrl_inb(RTC_DAY10) & 0xf) * 10; 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mon = (ctrl_inb(RTC_MON1) & 0xf) + (ctrl_inb(RTC_MON10) & 0xf) * 10; 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds year = (ctrl_inb(RTC_YEA1) & 0xf) + (ctrl_inb(RTC_YEA10) & 0xf) * 10 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds + (ctrl_inb(RTC_YEA100 ) & 0xf) * 100 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds + (ctrl_inb(RTC_YEA1000) & 0xf) * 1000; 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while (sec != (ctrl_inb(RTC_SEC1) & 0xf) + (ctrl_inb(RTC_SEC10) & 0x7) * 10); 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (year == 0 || mon < 1 || mon > 12 || day > 31 || day < 1 || 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hour > 23 || min > 59 || sec > 59) { 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "SH-03 RTC: invalid value, resetting to 1 Jan 2000\n"); 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("year=%d, mon=%d, day=%d, hour=%d, min=%d, sec=%d\n", 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds year, mon, day, hour, min, sec); 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_SEC1); ctrl_outb(0, RTC_SEC10); 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_MIN1); ctrl_outb(0, RTC_MIN10); 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_HOU1); ctrl_outb(0, RTC_HOU10); 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(6, RTC_WEE1); 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(1, RTC_DAY1); ctrl_outb(0, RTC_DAY10); 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(1, RTC_MON1); ctrl_outb(0, RTC_MON10); 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_YEA1); ctrl_outb(0, RTC_YEA10); 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_YEA100); 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(2, RTC_YEA1000); 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_CTL); 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto again; 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_lock); 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return mktime(year, mon, day, hour, min, sec); 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid sh03_rtc_gettimeofday(struct timespec *tv) 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tv->tv_sec = get_cmos_time(); 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tv->tv_nsec = 0; 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int set_rtc_mmss(unsigned long nowtime) 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int retval = 0; 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int real_seconds, real_minutes, cmos_minutes; 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* gets recalled with irq locally disabled */ 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock(&rtc_lock); 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */ 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(ctrl_inb(RTC_CTL) & RTC_BUSY)) 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmos_minutes = (ctrl_inb(RTC_MIN1) & 0xf) + (ctrl_inb(RTC_MIN10) & 0xf) * 10; 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_seconds = nowtime % 60; 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_minutes = nowtime / 60; 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1) 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_minutes += 30; /* correct for half hour time zone */ 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_minutes %= 60; 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (abs(real_minutes - cmos_minutes) < 30) { 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(real_seconds % 10, RTC_SEC1); 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(real_seconds / 10, RTC_SEC10); 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(real_minutes % 10, RTC_MIN1); 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(real_minutes / 10, RTC_MIN10); 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_WARNING 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "set_rtc_mmss: can't update from %d to %d\n", 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmos_minutes, real_minutes); 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds retval = -1; 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock(&rtc_lock); 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return retval; 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint sh03_rtc_settimeofday(const time_t secs) 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long nowtime = secs; 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return set_rtc_mmss(nowtime); 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid sh03_time_init(void) 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_get_time = sh03_rtc_gettimeofday; 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds rtc_set_time = sh03_rtc_settimeofday; 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 145