110 lines
2.1 KiB
C
110 lines
2.1 KiB
C
/*
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* (C) Copyright 2008
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* Gururaja Hebbar gururajakr@sanyo.co.in
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*
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* reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <rtc.h>
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#if defined(CONFIG_CMD_DATE)
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#ifndef CONFIG_SYS_RTC_PL031_BASE
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#error CONFIG_SYS_RTC_PL031_BASE is not defined!
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#endif
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/*
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* Register definitions
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*/
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#define RTC_DR 0x00 /* Data read register */
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#define RTC_MR 0x04 /* Match register */
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#define RTC_LR 0x08 /* Data load register */
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#define RTC_CR 0x0c /* Control register */
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#define RTC_IMSC 0x10 /* Interrupt mask and set register */
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#define RTC_RIS 0x14 /* Raw interrupt status register */
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#define RTC_MIS 0x18 /* Masked interrupt status register */
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#define RTC_ICR 0x1c /* Interrupt clear register */
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#define RTC_CR_START (1 << 0)
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#define RTC_WRITE_REG(addr, val) \
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(*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)) = (val))
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#define RTC_READ_REG(addr) \
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(*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)))
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static int pl031_initted = 0;
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/* Enable RTC Start in Control register*/
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void rtc_init(void)
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{
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RTC_WRITE_REG(RTC_CR, RTC_CR_START);
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pl031_initted = 1;
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}
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/*
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* Reset the RTC. We set the date back to 1970-01-01.
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*/
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void rtc_reset(void)
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{
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RTC_WRITE_REG(RTC_LR, 0x00);
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if(!pl031_initted)
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rtc_init();
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}
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/*
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* Set the RTC
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*/
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int rtc_set(struct rtc_time *tmp)
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{
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unsigned long tim;
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if(!pl031_initted)
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rtc_init();
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if (tmp == NULL) {
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puts("Error setting the date/time\n");
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return -1;
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}
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/* Calculate number of seconds this incoming time represents */
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tim = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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RTC_WRITE_REG(RTC_LR, tim);
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return -1;
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}
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/*
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* Get the current time from the RTC
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*/
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int rtc_get(struct rtc_time *tmp)
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{
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ulong tim;
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if(!pl031_initted)
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rtc_init();
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if (tmp == NULL) {
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puts("Error getting the date/time\n");
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return -1;
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}
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tim = RTC_READ_REG(RTC_DR);
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to_tm (tim, tmp);
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debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
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tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
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tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
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return 0;
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}
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#endif
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