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 * 7 * SPDX-License-Identifier: GPL-2.0+ 8 */ 9 10 #include <common.h> 11 #include <command.h> 12 #include <rtc.h> 13 14 #if defined(CONFIG_CMD_DATE) 15 16 #ifndef CONFIG_SYS_RTC_PL031_BASE 17 #error CONFIG_SYS_RTC_PL031_BASE is not defined! 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) \ 35 (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)) = (val)) 36 #define RTC_READ_REG(addr) \ 37 (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr))) 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 */ 62 int rtc_set(struct rtc_time *tmp) 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"); 71 return -1; 72 } 73 74 /* Calculate number of seconds this incoming time represents */ 75 tim = rtc_mktime(tmp); 76 77 RTC_WRITE_REG(RTC_LR, tim); 78 79 return -1; 80 } 81 82 /* 83 * Get the current time from the RTC 84 */ 85 int rtc_get(struct rtc_time *tmp) 86 { 87 ulong tim; 88 89 if(!pl031_initted) 90 rtc_init(); 91 92 if (tmp == NULL) { 93 puts("Error getting the date/time\n"); 94 return -1; 95 } 96 97 tim = RTC_READ_REG(RTC_DR); 98 99 rtc_to_tm(tim, tmp); 100 101 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 102 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 103 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 104 105 return 0; 106 } 107 108 #endif 109