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Diffstat (limited to 'board/bmw/m48t59y.c')
| -rw-r--r-- | board/bmw/m48t59y.c | 324 |
1 files changed, 0 insertions, 324 deletions
diff --git a/board/bmw/m48t59y.c b/board/bmw/m48t59y.c deleted file mode 100644 index 4e83b9076e..0000000000 --- a/board/bmw/m48t59y.c +++ /dev/null @@ -1,324 +0,0 @@ -/* - * SGS M48-T59Y TOD/NVRAM Driver - * - * (C) Copyright 2000 - * Wolfgang Denk, DENX Software Engineering, wd@denx.de. - * - * (C) Copyright 1999, by Curt McDowell, 08-06-99, Broadcom Corp. - * - * (C) Copyright 2001, James Dougherty, 07/18/01, Broadcom Corp. - * - * 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 - */ - -/* - * SGS M48-T59Y TOD/NVRAM Driver - * - * The SGS M48 an 8K NVRAM starting at offset M48_BASE_ADDR and - * continuing for 8176 bytes. After that starts the Time-Of-Day (TOD) - * registers which are used to set/get the internal date/time functions. - * - * This module implements Y2K compliance by taking full year numbers - * and translating back and forth from the TOD 2-digit year. - * - * NOTE: for proper interaction with an operating system, the TOD should - * be used to store Universal Coordinated Time (GMT) and timezone - * conversions should be used. - * - * Here is a diagram of the memory layout: - * - * +---------------------------------------------+ 0xffe0a000 - * | Non-volatile memory | . - * | | . - * | (8176 bytes of Non-volatile memory) | . - * | | . - * +---------------------------------------------+ 0xffe0bff0 - * | Flags | - * +---------------------------------------------+ 0xffe0bff1 - * | Unused | - * +---------------------------------------------+ 0xffe0bff2 - * | Alarm Seconds | - * +---------------------------------------------+ 0xffe0bff3 - * | Alarm Minutes | - * +---------------------------------------------+ 0xffe0bff4 - * | Alarm Date | - * +---------------------------------------------+ 0xffe0bff5 - * | Interrupts | - * +---------------------------------------------+ 0xffe0bff6 - * | WatchDog | - * +---------------------------------------------+ 0xffe0bff7 - * | Calibration | - * +---------------------------------------------+ 0xffe0bff8 - * | Seconds | - * +---------------------------------------------+ 0xffe0bff9 - * | Minutes | - * +---------------------------------------------+ 0xffe0bffa - * | Hours | - * +---------------------------------------------+ 0xffe0bffb - * | Day | - * +---------------------------------------------+ 0xffe0bffc - * | Date | - * +---------------------------------------------+ 0xffe0bffd - * | Month | - * +---------------------------------------------+ 0xffe0bffe - * | Year (2 digits only) | - * +---------------------------------------------+ 0xffe0bfff - */ -#include <common.h> -#include <rtc.h> -#include "bmw.h" - -/* - * Imported from mousse.h: - * - * TOD_REG_BASE Base of m48t59y TOD registers - * SYS_TOD_UNPROTECT() Disable NVRAM write protect - * SYS_TOD_PROTECT() Re-enable NVRAM write protect - */ - -#define YEAR 0xf -#define MONTH 0xe -#define DAY 0xd -#define DAY_OF_WEEK 0xc -#define HOUR 0xb -#define MINUTE 0xa -#define SECOND 0x9 -#define CONTROL 0x8 -#define WATCH 0x7 -#define INTCTL 0x6 -#define WD_DATE 0x5 -#define WD_HOUR 0x4 -#define WD_MIN 0x3 -#define WD_SEC 0x2 -#define _UNUSED 0x1 -#define FLAGS 0x0 - -#define M48_ADDR ((volatile unsigned char *) TOD_REG_BASE) - -int m48_tod_init(void) -{ - SYS_TOD_UNPROTECT(); - - M48_ADDR[CONTROL] = 0; - M48_ADDR[WATCH] = 0; - M48_ADDR[INTCTL] = 0; - - /* - * If the oscillator is currently stopped (as on a new part shipped - * from the factory), start it running. - * - * Here is an example of the TOD bytes on a brand new M48T59Y part: - * 00 00 00 00 00 00 00 00 00 88 8c c3 bf c8 f5 01 - */ - - if (M48_ADDR[SECOND] & 0x80) - M48_ADDR[SECOND] = 0; - - /* Is battery low */ - if ( M48_ADDR[FLAGS] & 0x10) { - printf("NOTICE: Battery low on Real-Time Clock (replace SNAPHAT).\n"); - } - - SYS_TOD_PROTECT(); - - return 0; -} - -/* - * m48_tod_set - */ - -static int to_bcd(int value) -{ - return value / 10 * 16 + value % 10; -} - -static int from_bcd(int value) -{ - return value / 16 * 10 + value % 16; -} - -static int day_of_week(int y, int m, int d) /* 0-6 ==> Sun-Sat */ -{ - static int t[] = {0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4}; - y -= m < 3; - return (y + y/4 - y/100 + y/400 + t[m-1] + d) % 7; -} - -/* - * Note: the TOD should store the current GMT - */ - -int m48_tod_set(int year, /* 1980-2079 */ - int month, /* 01-12 */ - int day, /* 01-31 */ - int hour, /* 00-23 */ - int minute, /* 00-59 */ - int second) /* 00-59 */ - -{ - SYS_TOD_UNPROTECT(); - - M48_ADDR[CONTROL] |= 0x80; /* Set WRITE bit */ - - M48_ADDR[YEAR] = to_bcd(year % 100); - M48_ADDR[MONTH] = to_bcd(month); - M48_ADDR[DAY] = to_bcd(day); - M48_ADDR[DAY_OF_WEEK] = day_of_week(year, month, day) + 1; - M48_ADDR[HOUR] = to_bcd(hour); - M48_ADDR[MINUTE] = to_bcd(minute); - M48_ADDR[SECOND] = to_bcd(second); - - M48_ADDR[CONTROL] &= ~0x80; /* Clear WRITE bit */ - - SYS_TOD_PROTECT(); - - return 0; -} - -/* - * Note: the TOD should store the current GMT - */ - -int m48_tod_get(int *year, /* 1980-2079 */ - int *month, /* 01-12 */ - int *day, /* 01-31 */ - int *hour, /* 00-23 */ - int *minute, /* 00-59 */ - int *second) /* 00-59 */ -{ - int y; - - SYS_TOD_UNPROTECT(); - - M48_ADDR[CONTROL] |= 0x40; /* Set READ bit */ - - y = from_bcd(M48_ADDR[YEAR]); - *year = y < 80 ? 2000 + y : 1900 + y; - *month = from_bcd(M48_ADDR[MONTH]); - *day = from_bcd(M48_ADDR[DAY]); - /* day_of_week = M48_ADDR[DAY_OF_WEEK] & 0xf; */ - *hour = from_bcd(M48_ADDR[HOUR]); - *minute = from_bcd(M48_ADDR[MINUTE]); - *second = from_bcd(M48_ADDR[SECOND] & 0x7f); - - M48_ADDR[CONTROL] &= ~0x40; /* Clear READ bit */ - - SYS_TOD_PROTECT(); - - return 0; -} - -int m48_tod_get_second(void) -{ - return from_bcd(M48_ADDR[SECOND] & 0x7f); -} - -/* - * Watchdog function - * - * If usec is 0, the watchdog timer is disarmed. - * - * If usec is non-zero, the watchdog timer is armed (or re-armed) for - * approximately usec microseconds (if the exact requested usec is - * not supported by the chip, the next higher available value is used). - * - * Minimum watchdog timeout = 62500 usec - * Maximum watchdog timeout = 124 sec (124000000 usec) - */ - -void m48_watchdog_arm(int usec) -{ - int mpy, res; - - SYS_TOD_UNPROTECT(); - - if (usec == 0) { - res = 0; - mpy = 0; - } else if (usec < 2000000) { /* Resolution: 1/16s if below 2s */ - res = 0; - mpy = (usec + 62499) / 62500; - } else if (usec < 8000000) { /* Resolution: 1/4s if below 8s */ - res = 1; - mpy = (usec + 249999) / 250000; - } else if (usec < 32000000) { /* Resolution: 1s if below 32s */ - res = 2; - mpy = (usec + 999999) / 1000000; - } else { /* Resolution: 4s up to 124s */ - res = 3; - mpy = (usec + 3999999) / 4000000; - if (mpy > 31) - mpy = 31; - } - - M48_ADDR[WATCH] = (0x80 | /* Steer to RST signal (IRQ = N/C) */ - mpy << 2 | - res); - - SYS_TOD_PROTECT(); -} - -/* - * U-Boot RTC support. - */ -int -rtc_get( struct rtc_time *tmp ) -{ - m48_tod_get(&tmp->tm_year, - &tmp->tm_mon, - &tmp->tm_mday, - &tmp->tm_hour, - &tmp->tm_min, - &tmp->tm_sec); - tmp->tm_yday = 0; - tmp->tm_isdst= 0; - -#ifdef RTC_DEBUG - printf( "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 ); -#endif - - return 0; -} - -int rtc_set( struct rtc_time *tmp ) -{ - m48_tod_set(tmp->tm_year, /* 1980-2079 */ - tmp->tm_mon, /* 01-12 */ - tmp->tm_mday, /* 01-31 */ - tmp->tm_hour, /* 00-23 */ - tmp->tm_min, /* 00-59 */ - tmp->tm_sec); /* 00-59 */ - -#ifdef RTC_DEBUG - printf( "Set 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); -#endif - - return 0; -} - -void -rtc_reset (void) -{ - m48_tod_init(); -} |
