rtc.c revision cd1408f22d2fd8f0d09c082b07cf0b9bcfb6eac9
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> 124f3a36a7d0eb420471506fcd46ee46f4b5cd4ebcMatt Mackall#include <linux/bcd.h> 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/rtc.h> 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/spinlock.h> 15af514ca7d27b31e3c278e1331f0ebdb3ad385a90Paul Mundt#include <asm/io.h> 16af514ca7d27b31e3c278e1331f0ebdb3ad385a90Paul Mundt#include <asm/rtc.h> 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_BASE 0xb0000000 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_SEC1 (RTC_BASE + 0) 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_SEC10 (RTC_BASE + 1) 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_MIN1 (RTC_BASE + 2) 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_MIN10 (RTC_BASE + 3) 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_HOU1 (RTC_BASE + 4) 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_HOU10 (RTC_BASE + 5) 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_WEE1 (RTC_BASE + 6) 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_DAY1 (RTC_BASE + 7) 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_DAY10 (RTC_BASE + 8) 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_MON1 (RTC_BASE + 9) 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_MON10 (RTC_BASE + 10) 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_YEA1 (RTC_BASE + 11) 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_YEA10 (RTC_BASE + 12) 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_YEA100 (RTC_BASE + 13) 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_YEA1000 (RTC_BASE + 14) 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_CTL (RTC_BASE + 15) 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_BUSY 1 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#define RTC_STOP 2 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 38cd1408f22d2fd8f0d09c082b07cf0b9bcfb6eac9Paul Mundtstatic DEFINE_SPINLOCK(sh03_rtc_lock); 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsunsigned long get_cmos_time(void) 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int year, mon, day, hour, min, sec; 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 44cd1408f22d2fd8f0d09c082b07cf0b9bcfb6eac9Paul Mundt spin_lock(&sh03_rtc_lock); 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds again: 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds do { 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sec = (ctrl_inb(RTC_SEC1) & 0xf) + (ctrl_inb(RTC_SEC10) & 0x7) * 10; 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds min = (ctrl_inb(RTC_MIN1) & 0xf) + (ctrl_inb(RTC_MIN10) & 0xf) * 10; 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hour = (ctrl_inb(RTC_HOU1) & 0xf) + (ctrl_inb(RTC_HOU10) & 0xf) * 10; 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds day = (ctrl_inb(RTC_DAY1) & 0xf) + (ctrl_inb(RTC_DAY10) & 0xf) * 10; 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mon = (ctrl_inb(RTC_MON1) & 0xf) + (ctrl_inb(RTC_MON10) & 0xf) * 10; 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds year = (ctrl_inb(RTC_YEA1) & 0xf) + (ctrl_inb(RTC_YEA10) & 0xf) * 10 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds + (ctrl_inb(RTC_YEA100 ) & 0xf) * 100 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds + (ctrl_inb(RTC_YEA1000) & 0xf) * 1000; 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } while (sec != (ctrl_inb(RTC_SEC1) & 0xf) + (ctrl_inb(RTC_SEC10) & 0x7) * 10); 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (year == 0 || mon < 1 || mon > 12 || day > 31 || day < 1 || 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hour > 23 || min > 59 || sec > 59) { 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "SH-03 RTC: invalid value, resetting to 1 Jan 2000\n"); 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk("year=%d, mon=%d, day=%d, hour=%d, min=%d, sec=%d\n", 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds year, mon, day, hour, min, sec); 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_SEC1); ctrl_outb(0, RTC_SEC10); 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_MIN1); ctrl_outb(0, RTC_MIN10); 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_HOU1); ctrl_outb(0, RTC_HOU10); 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(6, RTC_WEE1); 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(1, RTC_DAY1); ctrl_outb(0, RTC_DAY10); 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(1, RTC_MON1); ctrl_outb(0, RTC_MON10); 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_YEA1); ctrl_outb(0, RTC_YEA10); 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_YEA100); 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(2, RTC_YEA1000); 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(0, RTC_CTL); 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds goto again; 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 76cd1408f22d2fd8f0d09c082b07cf0b9bcfb6eac9Paul Mundt spin_unlock(&sh03_rtc_lock); 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return mktime(year, mon, day, hour, min, sec); 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid sh03_rtc_gettimeofday(struct timespec *tv) 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tv->tv_sec = get_cmos_time(); 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tv->tv_nsec = 0; 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic int set_rtc_mmss(unsigned long nowtime) 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int retval = 0; 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int real_seconds, real_minutes, cmos_minutes; 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int i; 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* gets recalled with irq locally disabled */ 94cd1408f22d2fd8f0d09c082b07cf0b9bcfb6eac9Paul Mundt spin_lock(&sh03_rtc_lock); 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */ 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (!(ctrl_inb(RTC_CTL) & RTC_BUSY)) 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmos_minutes = (ctrl_inb(RTC_MIN1) & 0xf) + (ctrl_inb(RTC_MIN10) & 0xf) * 10; 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_seconds = nowtime % 60; 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_minutes = nowtime / 60; 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1) 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_minutes += 30; /* correct for half hour time zone */ 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds real_minutes %= 60; 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (abs(real_minutes - cmos_minutes) < 30) { 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(real_seconds % 10, RTC_SEC1); 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(real_seconds / 10, RTC_SEC10); 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(real_minutes % 10, RTC_MIN1); 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ctrl_outb(real_minutes / 10, RTC_MIN10); 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } else { 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_WARNING 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "set_rtc_mmss: can't update from %d to %d\n", 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cmos_minutes, real_minutes); 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds retval = -1; 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 116cd1408f22d2fd8f0d09c082b07cf0b9bcfb6eac9Paul Mundt spin_unlock(&sh03_rtc_lock); 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return retval; 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint sh03_rtc_settimeofday(const time_t secs) 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long nowtime = secs; 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return set_rtc_mmss(nowtime); 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid sh03_time_init(void) 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 130af514ca7d27b31e3c278e1331f0ebdb3ad385a90Paul Mundt rtc_sh_get_time = sh03_rtc_gettimeofday; 131af514ca7d27b31e3c278e1331f0ebdb3ad385a90Paul Mundt rtc_sh_set_time = sh03_rtc_settimeofday; 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 133