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-rw-r--r--board/bmw/m48t59y.c324
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diff --git a/board/bmw/m48t59y.c b/board/bmw/m48t59y.c
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-/*
- * 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();
-}
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