diff options
Diffstat (limited to 'drivers/rtc/mpc5xxx.c')
| -rw-r--r-- | drivers/rtc/mpc5xxx.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/rtc/mpc5xxx.c b/drivers/rtc/mpc5xxx.c new file mode 100644 index 0000000..216386a --- /dev/null +++ b/drivers/rtc/mpc5xxx.c @@ -0,0 +1,140 @@ +/* + * (C) Copyright 2004 + * Reinhard Meyer, EMK Elektronik GmbH + * r.meyer@emk-elektronik.de + * www.emk-elektronik.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 + */ + +/***************************************************************************** + * Date & Time support for internal RTC of MPC52xx + *****************************************************************************/ +/*#define DEBUG*/ + +#include <common.h> +#include <command.h> +#include <rtc.h> + +#if defined(CONFIG_RTC_MPC5200) && defined(CONFIG_CMD_DATE) + +/***************************************************************************** + * this structure should be defined in mpc5200.h ... + *****************************************************************************/ +typedef struct rtc5200 { + volatile ulong tsr; /* MBAR+0x800: time set register */ + volatile ulong dsr; /* MBAR+0x804: data set register */ + volatile ulong nysr; /* MBAR+0x808: new year and stopwatch register */ + volatile ulong aier; /* MBAR+0x80C: alarm and interrupt enable register */ + volatile ulong ctr; /* MBAR+0x810: current time register */ + volatile ulong cdr; /* MBAR+0x814: current data register */ + volatile ulong asir; /* MBAR+0x818: alarm and stopwatch interupt register */ + volatile ulong piber; /* MBAR+0x81C: periodic interrupt and bus error register */ + volatile ulong trdr; /* MBAR+0x820: test register/divides register */ +} RTC5200; + +#define RTC_SET 0x02000000 +#define RTC_PAUSE 0x01000000 + +/***************************************************************************** + * get time + *****************************************************************************/ +void rtc_get (struct rtc_time *tmp) +{ + RTC5200 *rtc = (RTC5200 *) (CFG_MBAR+0x800); + ulong time, date, time2; + + /* read twice to avoid getting a funny time when the second is just changing */ + do { + time = rtc->ctr; + date = rtc->cdr; + time2 = rtc->ctr; + } while (time != time2); + + tmp->tm_year = date & 0xfff; + tmp->tm_mon = (date >> 24) & 0xf; + tmp->tm_mday = (date >> 16) & 0x1f; + tmp->tm_wday = (date >> 21) & 7; + /* sunday is 7 in 5200 but 0 in rtc_time */ + if (tmp->tm_wday == 7) + tmp->tm_wday = 0; + tmp->tm_hour = (time >> 16) & 0x1f; + tmp->tm_min = (time >> 8) & 0x3f; + tmp->tm_sec = time & 0x3f; + + debug ( "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); +} + +/***************************************************************************** + * set time + *****************************************************************************/ +void rtc_set (struct rtc_time *tmp) +{ + RTC5200 *rtc = (RTC5200 *) (CFG_MBAR+0x800); + ulong time, date, year; + + debug ( "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); + + time = (tmp->tm_hour << 16) | (tmp->tm_min << 8) | tmp->tm_sec; + date = (tmp->tm_mon << 16) | tmp->tm_mday; + if (tmp->tm_wday == 0) + date |= (7 << 8); + else + date |= (tmp->tm_wday << 8); + year = tmp->tm_year; + + /* mask unwanted bits that might show up when rtc_time is corrupt */ + time &= 0x001f3f3f; + date &= 0x001f071f; + year &= 0x00000fff; + + /* pause and set the RTC */ + rtc->nysr = year; + rtc->dsr = date | RTC_PAUSE; + udelay (1000); + rtc->dsr = date | RTC_PAUSE | RTC_SET; + udelay (1000); + rtc->dsr = date | RTC_PAUSE; + udelay (1000); + rtc->dsr = date; + udelay (1000); + + rtc->tsr = time | RTC_PAUSE; + udelay (1000); + rtc->tsr = time | RTC_PAUSE | RTC_SET; + udelay (1000); + rtc->tsr = time | RTC_PAUSE; + udelay (1000); + rtc->tsr = time; + udelay (1000); +} + +/***************************************************************************** + * reset rtc circuit + *****************************************************************************/ +void rtc_reset (void) +{ + return; /* nothing to do */ +} + +#endif |