[people/ms/u-boot.git] / drivers / rtc / pl031.c

/*
 * (C) Copyright 2008
 * Gururaja Hebbar gururajakr@sanyo.co.in
 *
 * reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <command.h>
#include <rtc.h>

#if defined(CONFIG_CMD_DATE)

#ifndef CONFIG_SYS_RTC_PL031_BASE
#error CONFIG_SYS_RTC_PL031_BASE is not defined!
#endif

/*
 * Register definitions
 */
#define	RTC_DR		0x00	/* Data read register */
#define	RTC_MR		0x04	/* Match register */
#define	RTC_LR		0x08	/* Data load register */
#define	RTC_CR		0x0c	/* Control register */
#define	RTC_IMSC	0x10	/* Interrupt mask and set register */
#define	RTC_RIS		0x14	/* Raw interrupt status register */
#define	RTC_MIS		0x18	/* Masked interrupt status register */
#define	RTC_ICR		0x1c	/* Interrupt clear register */

#define RTC_CR_START	(1 << 0)

#define	RTC_WRITE_REG(addr, val) \
			(*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)) = (val))
#define	RTC_READ_REG(addr)	\
			(*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)))

static int pl031_initted = 0;

/* Enable RTC Start in Control register*/
void rtc_init(void)
{
	RTC_WRITE_REG(RTC_CR, RTC_CR_START);

	pl031_initted = 1;
}

/*
 * Reset the RTC. We set the date back to 1970-01-01.
 */
void rtc_reset(void)
{
	RTC_WRITE_REG(RTC_LR, 0x00);
	if(!pl031_initted)
		rtc_init();
}

/*
 * Set the RTC
*/
int rtc_set(struct rtc_time *tmp)
{
	unsigned long tim;

	if(!pl031_initted)
		rtc_init();

	if (tmp == NULL) {
		puts("Error setting the date/time\n");
		return -1;
	}

	/* Calculate number of seconds this incoming time represents */
	tim = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
			tmp->tm_hour, tmp->tm_min, tmp->tm_sec);

	RTC_WRITE_REG(RTC_LR, tim);

	return -1;
}

/*
 * Get the current time from the RTC
 */
int rtc_get(struct rtc_time *tmp)
{
	ulong tim;

	if(!pl031_initted)
		rtc_init();

	if (tmp == NULL) {
		puts("Error getting the date/time\n");
		return -1;
	}

	tim = RTC_READ_REG(RTC_DR);

	to_tm (tim, tmp);

	debug ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);

	return 0;
}

#endif
Commit	Line	Data
535cfa4f GH	1	/*
	2	* (C) Copyright 2008
	3	* Gururaja Hebbar gururajakr@sanyo.co.in
	4	*
	5	* reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c
	6	*
1a459660	7	* SPDX-License-Identifier: GPL-2.0+
535cfa4f GH	8	*/
	9
	10	#include <common.h>
	11	#include <command.h>
	12	#include <rtc.h>
	13
	14	#if defined(CONFIG_CMD_DATE)
	15
6d0f6bcf JCPV	16	#ifndef CONFIG_SYS_RTC_PL031_BASE
6d0f6bcf JCPV	17	#error CONFIG_SYS_RTC_PL031_BASE is not defined!
535cfa4f GH	18	#endif
	19
	20	/*
	21	* Register definitions
	22	*/
	23	#define RTC_DR 0x00 /* Data read register */
	24	#define RTC_MR 0x04 /* Match register */
	25	#define RTC_LR 0x08 /* Data load register */
	26	#define RTC_CR 0x0c /* Control register */
	27	#define RTC_IMSC 0x10 /* Interrupt mask and set register */
	28	#define RTC_RIS 0x14 /* Raw interrupt status register */
	29	#define RTC_MIS 0x18 /* Masked interrupt status register */
	30	#define RTC_ICR 0x1c /* Interrupt clear register */
	31
	32	#define RTC_CR_START (1 << 0)
	33
	34	#define RTC_WRITE_REG(addr, val) \
6d0f6bcf	35	((volatile unsigned int )(CONFIG_SYS_RTC_PL031_BASE + (addr)) = (val))
535cfa4f	36	#define RTC_READ_REG(addr) \
6d0f6bcf	37	((volatile unsigned int )(CONFIG_SYS_RTC_PL031_BASE + (addr)))
535cfa4f GH	38
	39	static int pl031_initted = 0;
	40
	41	/* Enable RTC Start in Control register*/
	42	void rtc_init(void)
	43	{
	44	RTC_WRITE_REG(RTC_CR, RTC_CR_START);
	45
	46	pl031_initted = 1;
	47	}
	48
	49	/*
	50	* Reset the RTC. We set the date back to 1970-01-01.
	51	*/
	52	void rtc_reset(void)
	53	{
	54	RTC_WRITE_REG(RTC_LR, 0x00);
	55	if(!pl031_initted)
	56	rtc_init();
	57	}
	58
	59	/*
	60	* Set the RTC
	61	*/
d1e23194	62	int rtc_set(struct rtc_time *tmp)
535cfa4f GH	63	{
	64	unsigned long tim;
	65
	66	if(!pl031_initted)
	67	rtc_init();
	68
	69	if (tmp == NULL) {
	70	puts("Error setting the date/time\n");
d1e23194	71	return -1;
535cfa4f GH	72	}
	73
	74	/* Calculate number of seconds this incoming time represents */
	75	tim = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
93e14596	76	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
535cfa4f GH	77
535cfa4f GH	78	RTC_WRITE_REG(RTC_LR, tim);
d1e23194 JCPV	79
d1e23194 JCPV	80	return -1;
535cfa4f GH	81	}
	82
	83	/*
	84	* Get the current time from the RTC
	85	*/
	86	int rtc_get(struct rtc_time *tmp)
	87	{
	88	ulong tim;
	89
	90	if(!pl031_initted)
	91	rtc_init();
	92
	93	if (tmp == NULL) {
	94	puts("Error getting the date/time\n");
	95	return -1;
	96	}
	97
	98	tim = RTC_READ_REG(RTC_DR);
	99
	100	to_tm (tim, tmp);
	101
	102	debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
	103	tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
	104	tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
	105
	106	return 0;
	107	}
	108
	109	#endif