[thirdparty/linux.git] / arch / sh / boards / mach-sh03 / rtc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * linux/arch/sh/boards/sh03/rtc.c -- CTP/PCI-SH03 on-chip RTC support
 *
 *  Copyright (C) 2004  Saito.K & Jeanne(ksaito@interface.co.jp)
 *
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/bcd.h>
#include <linux/rtc.h>
#include <linux/spinlock.h>
#include <asm/io.h>
#include <asm/rtc.h>

#define RTC_BASE	0xb0000000
#define RTC_SEC1	(RTC_BASE + 0)
#define RTC_SEC10	(RTC_BASE + 1)
#define RTC_MIN1	(RTC_BASE + 2)
#define RTC_MIN10	(RTC_BASE + 3)
#define RTC_HOU1	(RTC_BASE + 4)
#define RTC_HOU10	(RTC_BASE + 5)
#define RTC_WEE1	(RTC_BASE + 6)
#define RTC_DAY1	(RTC_BASE + 7)
#define RTC_DAY10	(RTC_BASE + 8)
#define RTC_MON1	(RTC_BASE + 9)
#define RTC_MON10	(RTC_BASE + 10)
#define RTC_YEA1	(RTC_BASE + 11)
#define RTC_YEA10	(RTC_BASE + 12)
#define RTC_YEA100	(RTC_BASE + 13)
#define RTC_YEA1000	(RTC_BASE + 14)
#define RTC_CTL		(RTC_BASE + 15)
#define RTC_BUSY	1
#define RTC_STOP	2

static DEFINE_SPINLOCK(sh03_rtc_lock);

unsigned long get_cmos_time(void)
{
	unsigned int year, mon, day, hour, min, sec;

	spin_lock(&sh03_rtc_lock);
 again:
	do {
		sec  = (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10;
		min  = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10;
		hour = (__raw_readb(RTC_HOU1) & 0xf) + (__raw_readb(RTC_HOU10) & 0xf) * 10;
		day  = (__raw_readb(RTC_DAY1) & 0xf) + (__raw_readb(RTC_DAY10) & 0xf) * 10;
		mon  = (__raw_readb(RTC_MON1) & 0xf) + (__raw_readb(RTC_MON10) & 0xf) * 10;
		year = (__raw_readb(RTC_YEA1) & 0xf) + (__raw_readb(RTC_YEA10) & 0xf) * 10
		     + (__raw_readb(RTC_YEA100 ) & 0xf) * 100
		     + (__raw_readb(RTC_YEA1000) & 0xf) * 1000;
	} while (sec != (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10);
	if (year == 0 || mon < 1 || mon > 12 || day > 31 || day < 1 ||
	    hour > 23 || min > 59 || sec > 59) {
		printk(KERN_ERR
		       "SH-03 RTC: invalid value, resetting to 1 Jan 2000\n");
		printk("year=%d, mon=%d, day=%d, hour=%d, min=%d, sec=%d\n",
		       year, mon, day, hour, min, sec);

		__raw_writeb(0, RTC_SEC1); __raw_writeb(0, RTC_SEC10);
		__raw_writeb(0, RTC_MIN1); __raw_writeb(0, RTC_MIN10);
		__raw_writeb(0, RTC_HOU1); __raw_writeb(0, RTC_HOU10);
		__raw_writeb(6, RTC_WEE1);
		__raw_writeb(1, RTC_DAY1); __raw_writeb(0, RTC_DAY10);
		__raw_writeb(1, RTC_MON1); __raw_writeb(0, RTC_MON10);
		__raw_writeb(0, RTC_YEA1); __raw_writeb(0, RTC_YEA10);
		__raw_writeb(0, RTC_YEA100);
		__raw_writeb(2, RTC_YEA1000);
		__raw_writeb(0, RTC_CTL);
		goto again;
	}

	spin_unlock(&sh03_rtc_lock);
	return mktime(year, mon, day, hour, min, sec);
}

void sh03_rtc_gettimeofday(struct timespec *tv)
{

	tv->tv_sec = get_cmos_time();
	tv->tv_nsec = 0;
}

static int set_rtc_mmss(unsigned long nowtime)
{
	int retval = 0;
	int real_seconds, real_minutes, cmos_minutes;
	int i;

	/* gets recalled with irq locally disabled */
	spin_lock(&sh03_rtc_lock);
	for (i = 0 ; i < 1000000 ; i++)	/* may take up to 1 second... */
		if (!(__raw_readb(RTC_CTL) & RTC_BUSY))
			break;
	cmos_minutes = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10;
	real_seconds = nowtime % 60;
	real_minutes = nowtime / 60;
	if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
		real_minutes += 30;		/* correct for half hour time zone */
	real_minutes %= 60;

	if (abs(real_minutes - cmos_minutes) < 30) {
		__raw_writeb(real_seconds % 10, RTC_SEC1);
		__raw_writeb(real_seconds / 10, RTC_SEC10);
		__raw_writeb(real_minutes % 10, RTC_MIN1);
		__raw_writeb(real_minutes / 10, RTC_MIN10);
	} else {
		printk_once(KERN_NOTICE
		       "set_rtc_mmss: can't update from %d to %d\n",
		       cmos_minutes, real_minutes);
		retval = -1;
	}
	spin_unlock(&sh03_rtc_lock);

	return retval;
}

int sh03_rtc_settimeofday(const time_t secs)
{
	unsigned long nowtime = secs;

	return set_rtc_mmss(nowtime);
}

void sh03_time_init(void)
{
	rtc_sh_get_time = sh03_rtc_gettimeofday;
	rtc_sh_set_time = sh03_rtc_settimeofday;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	/*
	3	* linux/arch/sh/boards/sh03/rtc.c -- CTP/PCI-SH03 on-chip RTC support
	4	*
	5	* Copyright (C) 2004 Saito.K & Jeanne(ksaito@interface.co.jp)
	6	*
	7	*/
	8
	9	#include <linux/init.h>
	10	#include <linux/kernel.h>
	11	#include <linux/sched.h>
	12	#include <linux/time.h>
4f3a36a7	13	#include <linux/bcd.h>
1da177e4 LT	14	#include <linux/rtc.h>
1da177e4 LT	15	#include <linux/spinlock.h>
af514ca7 PM	16	#include <asm/io.h>
af514ca7 PM	17	#include <asm/rtc.h>
1da177e4 LT	18
	19	#define RTC_BASE 0xb0000000
	20	#define RTC_SEC1 (RTC_BASE + 0)
	21	#define RTC_SEC10 (RTC_BASE + 1)
	22	#define RTC_MIN1 (RTC_BASE + 2)
	23	#define RTC_MIN10 (RTC_BASE + 3)
	24	#define RTC_HOU1 (RTC_BASE + 4)
	25	#define RTC_HOU10 (RTC_BASE + 5)
	26	#define RTC_WEE1 (RTC_BASE + 6)
	27	#define RTC_DAY1 (RTC_BASE + 7)
	28	#define RTC_DAY10 (RTC_BASE + 8)
	29	#define RTC_MON1 (RTC_BASE + 9)
	30	#define RTC_MON10 (RTC_BASE + 10)
	31	#define RTC_YEA1 (RTC_BASE + 11)
	32	#define RTC_YEA10 (RTC_BASE + 12)
	33	#define RTC_YEA100 (RTC_BASE + 13)
	34	#define RTC_YEA1000 (RTC_BASE + 14)
	35	#define RTC_CTL (RTC_BASE + 15)
	36	#define RTC_BUSY 1
	37	#define RTC_STOP 2
	38
cd1408f2	39	static DEFINE_SPINLOCK(sh03_rtc_lock);
1da177e4 LT	40
	41	unsigned long get_cmos_time(void)
	42	{
	43	unsigned int year, mon, day, hour, min, sec;
1da177e4	44
cd1408f2	45	spin_lock(&sh03_rtc_lock);
1da177e4	46	again:
1da177e4	47	do {
9d56dd3b PM	48	sec = (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10;
	49	min = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10;
	50	hour = (__raw_readb(RTC_HOU1) & 0xf) + (__raw_readb(RTC_HOU10) & 0xf) * 10;
	51	day = (__raw_readb(RTC_DAY1) & 0xf) + (__raw_readb(RTC_DAY10) & 0xf) * 10;
	52	mon = (__raw_readb(RTC_MON1) & 0xf) + (__raw_readb(RTC_MON10) & 0xf) * 10;
	53	year = (__raw_readb(RTC_YEA1) & 0xf) + (__raw_readb(RTC_YEA10) & 0xf) * 10
	54	+ (__raw_readb(RTC_YEA100 ) & 0xf) * 100
	55	+ (__raw_readb(RTC_YEA1000) & 0xf) * 1000;
	56	} while (sec != (__raw_readb(RTC_SEC1) & 0xf) + (__raw_readb(RTC_SEC10) & 0x7) * 10);
1da177e4 LT	57	if (year == 0 \|\| mon < 1 \|\| mon > 12 \|\| day > 31 \|\| day < 1 \|\|
	58	hour > 23 \|\| min > 59 \|\| sec > 59) {
	59	printk(KERN_ERR
	60	"SH-03 RTC: invalid value, resetting to 1 Jan 2000\n");
	61	printk("year=%d, mon=%d, day=%d, hour=%d, min=%d, sec=%d\n",
	62	year, mon, day, hour, min, sec);
	63
9d56dd3b PM	64	__raw_writeb(0, RTC_SEC1); __raw_writeb(0, RTC_SEC10);
	65	__raw_writeb(0, RTC_MIN1); __raw_writeb(0, RTC_MIN10);
	66	__raw_writeb(0, RTC_HOU1); __raw_writeb(0, RTC_HOU10);
	67	__raw_writeb(6, RTC_WEE1);
	68	__raw_writeb(1, RTC_DAY1); __raw_writeb(0, RTC_DAY10);
	69	__raw_writeb(1, RTC_MON1); __raw_writeb(0, RTC_MON10);
	70	__raw_writeb(0, RTC_YEA1); __raw_writeb(0, RTC_YEA10);
	71	__raw_writeb(0, RTC_YEA100);
	72	__raw_writeb(2, RTC_YEA1000);
	73	__raw_writeb(0, RTC_CTL);
1da177e4 LT	74	goto again;
	75	}
	76
cd1408f2	77	spin_unlock(&sh03_rtc_lock);
1da177e4 LT	78	return mktime(year, mon, day, hour, min, sec);
	79	}
	80
	81	void sh03_rtc_gettimeofday(struct timespec *tv)
	82	{
	83
	84	tv->tv_sec = get_cmos_time();
	85	tv->tv_nsec = 0;
	86	}
	87
	88	static int set_rtc_mmss(unsigned long nowtime)
	89	{
	90	int retval = 0;
	91	int real_seconds, real_minutes, cmos_minutes;
	92	int i;
	93
	94	/* gets recalled with irq locally disabled */
cd1408f2	95	spin_lock(&sh03_rtc_lock);
1da177e4	96	for (i = 0 ; i < 1000000 ; i++) /* may take up to 1 second... */
9d56dd3b	97	if (!(__raw_readb(RTC_CTL) & RTC_BUSY))
1da177e4	98	break;
9d56dd3b	99	cmos_minutes = (__raw_readb(RTC_MIN1) & 0xf) + (__raw_readb(RTC_MIN10) & 0xf) * 10;
1da177e4 LT	100	real_seconds = nowtime % 60;
	101	real_minutes = nowtime / 60;
	102	if (((abs(real_minutes - cmos_minutes) + 15)/30) & 1)
	103	real_minutes += 30; /* correct for half hour time zone */
	104	real_minutes %= 60;
	105
	106	if (abs(real_minutes - cmos_minutes) < 30) {
9d56dd3b PM	107	__raw_writeb(real_seconds % 10, RTC_SEC1);
	108	__raw_writeb(real_seconds / 10, RTC_SEC10);
	109	__raw_writeb(real_minutes % 10, RTC_MIN1);
	110	__raw_writeb(real_minutes / 10, RTC_MIN10);
1da177e4	111	} else {
3e5c1240	112	printk_once(KERN_NOTICE
1da177e4 LT	113	"set_rtc_mmss: can't update from %d to %d\n",
	114	cmos_minutes, real_minutes);
	115	retval = -1;
	116	}
cd1408f2	117	spin_unlock(&sh03_rtc_lock);
1da177e4 LT	118
	119	return retval;
	120	}
	121
	122	int sh03_rtc_settimeofday(const time_t secs)
	123	{
	124	unsigned long nowtime = secs;
	125
	126	return set_rtc_mmss(nowtime);
	127	}
	128
	129	void sh03_time_init(void)
	130	{
af514ca7 PM	131	rtc_sh_get_time = sh03_rtc_gettimeofday;
af514ca7 PM	132	rtc_sh_set_time = sh03_rtc_settimeofday;
1da177e4	133	}