144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/sh/boards/sh03/rtc.c -- CTP/PCI-SH03 on-chip RTC support
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*
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* Copyright (C) 2004 Saito.K & Jeanne(ksaito@interface.co.jp)
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*
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/time.h>
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#include <linux/bcd.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#define RTC_BASE 0xb0000000
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#define RTC_SEC1 (RTC_BASE + 0)
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#define RTC_SEC10 (RTC_BASE + 1)
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#define RTC_MIN1 (RTC_BASE + 2)
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#define RTC_MIN10 (RTC_BASE + 3)
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#define RTC_HOU1 (RTC_BASE + 4)
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#define RTC_HOU10 (RTC_BASE + 5)
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#define RTC_WEE1 (RTC_BASE + 6)
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#define RTC_DAY1 (RTC_BASE + 7)
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#define RTC_DAY10 (RTC_BASE + 8)
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#define RTC_MON1 (RTC_BASE + 9)
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#define RTC_MON10 (RTC_BASE + 10)
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#define RTC_YEA1 (RTC_BASE + 11)
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#define RTC_YEA10 (RTC_BASE + 12)
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#define RTC_YEA100 (RTC_BASE + 13)
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#define RTC_YEA1000 (RTC_BASE + 14)
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#define RTC_CTL (RTC_BASE + 15)
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#define RTC_BUSY 1
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#define RTC_STOP 2
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static DEFINE_SPINLOCK(sh03_rtc_lock);
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static int sh03_rtc_gettimeofday(struct device *dev, struct rtc_time *tm)
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{
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unsigned int year, mon, day, hour, min, sec;
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spin_lock(&sh03_rtc_lock);
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again:
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do {
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sec = (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10;
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min = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10;
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hour = (__raw_readb(RTC_HOU1) & 0xf) + (__raw_readb(RTC_HOU10) & 0xf) * 10;
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day = (__raw_readb(RTC_DAY1) & 0xf) + (__raw_readb(RTC_DAY10) & 0xf) * 10;
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mon = (__raw_readb(RTC_MON1) & 0xf) + (__raw_readb(RTC_MON10) & 0xf) * 10;
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year = (__raw_readb(RTC_YEA1) & 0xf) + (__raw_readb(RTC_YEA10) & 0xf) * 10
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+ (__raw_readb(RTC_YEA100 ) & 0xf) * 100
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+ (__raw_readb(RTC_YEA1000) & 0xf) * 1000;
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} while (sec != (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10);
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if (year == 0 || mon < 1 || mon > 12 || day > 31 || day < 1 ||
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hour > 23 || min > 59 || sec > 59) {
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printk(KERN_ERR
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"SH-03 RTC: invalid value, resetting to 1 Jan 2000\n");
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printk("year=%d, mon=%d, day=%d, hour=%d, min=%d, sec=%d\n",
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year, mon, day, hour, min, sec);
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__raw_writeb(0, RTC_SEC1); __raw_writeb(0, RTC_SEC10);
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__raw_writeb(0, RTC_MIN1); __raw_writeb(0, RTC_MIN10);
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__raw_writeb(0, RTC_HOU1); __raw_writeb(0, RTC_HOU10);
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__raw_writeb(6, RTC_WEE1);
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__raw_writeb(1, RTC_DAY1); __raw_writeb(0, RTC_DAY10);
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__raw_writeb(1, RTC_MON1); __raw_writeb(0, RTC_MON10);
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__raw_writeb(0, RTC_YEA1); __raw_writeb(0, RTC_YEA10);
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__raw_writeb(0, RTC_YEA100);
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__raw_writeb(2, RTC_YEA1000);
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__raw_writeb(0, RTC_CTL);
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goto again;
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}
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spin_unlock(&sh03_rtc_lock);
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tm->tm_sec = sec;
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tm->tm_min = min;
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tm->tm_hour = hour;
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tm->tm_mday = day;
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tm->tm_mon = mon;
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tm->tm_year = year - 1900;
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return 0;
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}
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static int set_rtc_mmss(struct rtc_time *tm)
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{
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int retval = 0;
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int real_seconds, real_minutes, cmos_minutes;
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int i;
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/* gets recalled with irq locally disabled */
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spin_lock(&sh03_rtc_lock);
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for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */
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if (!(__raw_readb(RTC_CTL) & RTC_BUSY))
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break;
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cmos_minutes = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10;
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real_seconds = tm->tm_sec;
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real_minutes = tm->tm_min;
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if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
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real_minutes += 30; /* correct for half hour time zone */
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real_minutes %= 60;
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if (abs(real_minutes - cmos_minutes) < 30) {
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__raw_writeb(real_seconds % 10, RTC_SEC1);
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__raw_writeb(real_seconds / 10, RTC_SEC10);
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__raw_writeb(real_minutes % 10, RTC_MIN1);
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__raw_writeb(real_minutes / 10, RTC_MIN10);
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} else {
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printk_once(KERN_NOTICE
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"set_rtc_mmss: can't update from %d to %d\n",
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cmos_minutes, real_minutes);
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retval = -EINVAL;
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}
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spin_unlock(&sh03_rtc_lock);
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return retval;
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}
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int sh03_rtc_settimeofday(struct device *dev, struct rtc_time *tm)
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{
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return set_rtc_mmss(tm);
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}
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static const struct rtc_class_ops rtc_generic_ops = {
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.read_time = sh03_rtc_gettimeofday,
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.set_time = sh03_rtc_settimeofday,
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};
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static int __init sh03_time_init(void)
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{
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struct platform_device *pdev;
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pdev = platform_device_register_data(NULL, "rtc-generic", -1,
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&rtc_generic_ops,
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sizeof(rtc_generic_ops));
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return PTR_ERR_OR_ZERO(pdev);
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}
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arch_initcall(sh03_time_init);
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