| /* |
| * (C) Copyright 2001 |
| * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| * |
| * See file CREDITS for list of people who contributed to this |
| * project. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; either version 2 of |
| * the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| * Real Time Clock interface of ADI21535 (Blackfin) for uCLinux |
| * |
| * Copyright (C) 2003 Motorola Corporation. All rights reserved. |
| * Richard Xiao (A2590C@email.mot.com) |
| * |
| * Copyright (C) 1996 Paul Gortmaker |
| * |
| * |
| * Based on other minimal char device drivers, like Alan's |
| * watchdog, Ted's random, etc. etc. |
| * |
| * 1.07 Paul Gortmaker. |
| * 1.08 Miquel van Smoorenburg: disallow certain things on the |
| * DEC Alpha as the CMOS clock is also used for other things. |
| * 1.09 Nikita Schmidt: epoch support and some Alpha cleanup. |
| * 1.09a Pete Zaitcev: Sun SPARC |
| * 1.09b Jeff Garzik: Modularize, init cleanup |
| * 1.09c Jeff Garzik: SMP cleanup |
| * 1.10 Paul Barton-Davis: add support for async I/O |
| * 1.10a Andrea Arcangeli: Alpha updates |
| * 1.10b Andrew Morton: SMP lock fix |
| * 1.10c Cesar Barros: SMP locking fixes and cleanup |
| * 1.10d Paul Gortmaker: delete paranoia check in rtc_exit |
| * 1.10e LG Soft India: Register access is different in BF533. |
| */ |
| |
| #include <common.h> |
| #include <command.h> |
| #include <rtc.h> |
| |
| #if defined(CONFIG_RTC_BFIN) && defined(CONFIG_CMD_DATE) |
| |
| #include <asm/blackfin.h> |
| #include <asm/mach-common/bits/rtc.h> |
| |
| #define MIN_TO_SECS(_x_) (60 * _x_) |
| #define HRS_TO_SECS(_x_) (60 * 60 * _x_) |
| #define DAYS_TO_SECS(_x_) (24 * 60 * 60 * _x_) |
| |
| #define NUM_SECS_IN_DAY (24 * 3600) |
| #define NUM_SECS_IN_HOUR (3600) |
| #define NUM_SECS_IN_MIN (60) |
| |
| /* Shift values for RTC_STAT register */ |
| #define DAY_BITS_OFF 17 |
| #define HOUR_BITS_OFF 12 |
| #define MIN_BITS_OFF 6 |
| #define SEC_BITS_OFF 0 |
| |
| void rtc_reset(void) |
| { |
| return; /* nothing to do */ |
| } |
| |
| /* Wait for pending writes to complete */ |
| void wait_for_complete(void) |
| { |
| while (!(*(volatile unsigned short *)RTC_ISTAT & 0x8000)) { |
| printf(""); |
| } |
| *(volatile unsigned short *)RTC_ISTAT = 0x8000; |
| } |
| |
| /* Enable the RTC prescaler enable register */ |
| void rtc_init() |
| { |
| *(volatile unsigned short *)RTC_PREN = 0x1; |
| wait_for_complete(); |
| } |
| |
| /* Set the time. Get the time_in_secs which is the number of seconds since Jan 1970 and set the RTC registers |
| * based on this value. |
| */ |
| void rtc_set(struct rtc_time *tmp) |
| { |
| unsigned long n_days_1970 = 0; |
| unsigned long n_secs_rem = 0; |
| unsigned long n_hrs = 0; |
| unsigned long n_mins = 0; |
| unsigned long n_secs = 0; |
| unsigned long time_in_secs; |
| |
| if (tmp == NULL) { |
| printf("Error setting the date/time \n"); |
| return; |
| } |
| |
| time_in_secs = |
| mktime(tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour, |
| tmp->tm_min, tmp->tm_sec); |
| |
| /* Compute no. of days since 1970 */ |
| n_days_1970 = (unsigned long)(time_in_secs / (NUM_SECS_IN_DAY)); |
| |
| /* From the remining secs, compute the hrs(0-23), mins(0-59) and secs(0-59) */ |
| n_secs_rem = (unsigned long)(time_in_secs % (NUM_SECS_IN_DAY)); |
| n_hrs = n_secs_rem / (NUM_SECS_IN_HOUR); |
| n_secs_rem = n_secs_rem % (NUM_SECS_IN_HOUR); |
| n_mins = n_secs_rem / (NUM_SECS_IN_MIN); |
| n_secs = n_secs_rem % (NUM_SECS_IN_MIN); |
| |
| /* Store the new time in the RTC_STAT register */ |
| *(volatile unsigned long *)RTC_STAT = |
| ((n_days_1970 << DAY_BITS_OFF) | (n_hrs << HOUR_BITS_OFF) | |
| (n_mins << MIN_BITS_OFF) | (n_secs << SEC_BITS_OFF)); |
| |
| wait_for_complete(); |
| } |
| |
| /* Read the time from the RTC_STAT. time_in_seconds is seconds since Jan 1970 */ |
| void rtc_get(struct rtc_time *tmp) |
| { |
| unsigned long cur_rtc_stat = 0; |
| unsigned long time_in_sec; |
| unsigned long tm_sec = 0, tm_min = 0, tm_hour = 0, tm_day = 0; |
| |
| if (tmp == NULL) { |
| printf("Error getting the date/time \n"); |
| return; |
| } |
| |
| /* Read the RTC_STAT register */ |
| cur_rtc_stat = *(volatile unsigned long *)RTC_STAT; |
| |
| /* Get the secs (0-59), mins (0-59), hrs (0-23) and the days since Jan 1970 */ |
| tm_sec = (cur_rtc_stat >> SEC_BITS_OFF) & 0x3f; |
| tm_min = (cur_rtc_stat >> MIN_BITS_OFF) & 0x3f; |
| tm_hour = (cur_rtc_stat >> HOUR_BITS_OFF) & 0x1f; |
| tm_day = (cur_rtc_stat >> DAY_BITS_OFF) & 0x7fff; |
| |
| /* Calculate the total number of seconds since Jan 1970 */ |
| time_in_sec = (tm_sec) + |
| MIN_TO_SECS(tm_min) + HRS_TO_SECS(tm_hour) + DAYS_TO_SECS(tm_day); |
| to_tm(time_in_sec, tmp); |
| } |
| #endif |