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 * See file CREDITS for list of people who contributed to this 8 * project. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License as 12 * published by the Free Software Foundation; either version 2 of 13 * the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 23 * MA 02111-1307 USA 24 */ 25 26 #include <common.h> 27 #include <command.h> 28 #include <rtc.h> 29 30 #if defined(CONFIG_CMD_DATE) 31 32 #ifndef CONFIG_SYS_RTC_PL031_BASE 33 #error CONFIG_SYS_RTC_PL031_BASE is not defined! 34 #endif 35 36 /* 37 * Register definitions 38 */ 39 #define RTC_DR 0x00 /* Data read register */ 40 #define RTC_MR 0x04 /* Match register */ 41 #define RTC_LR 0x08 /* Data load register */ 42 #define RTC_CR 0x0c /* Control register */ 43 #define RTC_IMSC 0x10 /* Interrupt mask and set register */ 44 #define RTC_RIS 0x14 /* Raw interrupt status register */ 45 #define RTC_MIS 0x18 /* Masked interrupt status register */ 46 #define RTC_ICR 0x1c /* Interrupt clear register */ 47 48 #define RTC_CR_START (1 << 0) 49 50 #define RTC_WRITE_REG(addr, val) \ 51 (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr)) = (val)) 52 #define RTC_READ_REG(addr) \ 53 (*(volatile unsigned int *)(CONFIG_SYS_RTC_PL031_BASE + (addr))) 54 55 static int pl031_initted = 0; 56 57 /* Enable RTC Start in Control register*/ 58 void rtc_init(void) 59 { 60 RTC_WRITE_REG(RTC_CR, RTC_CR_START); 61 62 pl031_initted = 1; 63 } 64 65 /* 66 * Reset the RTC. We set the date back to 1970-01-01. 67 */ 68 void rtc_reset(void) 69 { 70 RTC_WRITE_REG(RTC_LR, 0x00); 71 if(!pl031_initted) 72 rtc_init(); 73 } 74 75 /* 76 * Set the RTC 77 */ 78 int rtc_set(struct rtc_time *tmp) 79 { 80 unsigned long tim; 81 82 if(!pl031_initted) 83 rtc_init(); 84 85 if (tmp == NULL) { 86 puts("Error setting the date/time\n"); 87 return -1; 88 } 89 90 /* Calculate number of seconds this incoming time represents */ 91 tim = mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, 92 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 93 94 RTC_WRITE_REG(RTC_LR, tim); 95 96 return -1; 97 } 98 99 /* 100 * Get the current time from the RTC 101 */ 102 int rtc_get(struct rtc_time *tmp) 103 { 104 ulong tim; 105 106 if(!pl031_initted) 107 rtc_init(); 108 109 if (tmp == NULL) { 110 puts("Error getting the date/time\n"); 111 return -1; 112 } 113 114 tim = RTC_READ_REG(RTC_DR); 115 116 to_tm (tim, tmp); 117 118 debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", 119 tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, 120 tmp->tm_hour, tmp->tm_min, tmp->tm_sec); 121 122 return 0; 123 } 124 125 #endif 126