/* * (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 #include #include #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 = rtc_mktime(tmp); 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); rtc_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