diff options
Diffstat (limited to 'drivers/rtc/ftrtc010.c')
| -rw-r--r-- | drivers/rtc/ftrtc010.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/rtc/ftrtc010.c b/drivers/rtc/ftrtc010.c new file mode 100644 index 0000000..c3c0bc2 --- /dev/null +++ b/drivers/rtc/ftrtc010.c @@ -0,0 +1,124 @@ +/* + * Faraday FTRTC010 Real Time Clock + * + * (C) Copyright 2009 Faraday Technology + * Po-Yu Chuang <ratbert@faraday-tech.com> + * + * 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., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <config.h> +#include <common.h> +#include <rtc.h> +#include <asm/io.h> + +struct ftrtc010 { + unsigned int sec; /* 0x00 */ + unsigned int min; /* 0x04 */ + unsigned int hour; /* 0x08 */ + unsigned int day; /* 0x0c */ + unsigned int alarm_sec; /* 0x10 */ + unsigned int alarm_min; /* 0x14 */ + unsigned int alarm_hour; /* 0x18 */ + unsigned int record; /* 0x1c */ + unsigned int cr; /* 0x20 */ +}; + +/* + * RTC Control Register + */ +#define FTRTC010_CR_ENABLE (1 << 0) +#define FTRTC010_CR_INTERRUPT_SEC (1 << 1) /* per second irq */ +#define FTRTC010_CR_INTERRUPT_MIN (1 << 2) /* per minute irq */ +#define FTRTC010_CR_INTERRUPT_HR (1 << 3) /* per hour irq */ +#define FTRTC010_CR_INTERRUPT_DAY (1 << 4) /* per day irq */ + +static struct ftrtc010 *rtc = (struct ftrtc010 *)CONFIG_FTRTC010_BASE; + +static void ftrtc010_enable (void) +{ + writel (FTRTC010_CR_ENABLE, &rtc->cr); +} + +/* + * return current time in seconds + */ +static unsigned long ftrtc010_time (void) +{ + unsigned long day; + unsigned long hour; + unsigned long minute; + unsigned long second; + unsigned long second2; + + do { + second = readl (&rtc->sec); + day = readl (&rtc->day); + hour = readl (&rtc->hour); + minute = readl (&rtc->min); + second2 = readl (&rtc->sec); + } while (second != second2); + + return day * 24 * 60 * 60 + hour * 60 * 60 + minute * 60 + second; +} + +/* + * Get the current time from the RTC + */ + +int rtc_get (struct rtc_time *tmp) +{ + unsigned long now; + + debug ("%s(): record register: %x\n", + __func__, readl (&rtc->record)); + + now = ftrtc010_time () + readl (&rtc->record); + + to_tm (now, tmp); + + return 0; +} + +/* + * Set the RTC + */ +int rtc_set (struct rtc_time *tmp) +{ + unsigned long new; + unsigned long now; + + debug ("%s(): DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", + __func__, + tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday, + tmp->tm_hour, tmp->tm_min, tmp->tm_sec); + + new = mktime (tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_hour, + tmp->tm_min, tmp->tm_sec); + + now = ftrtc010_time (); + + debug ("%s(): write %lx to record register\n", __func__, new - now); + + writel (new - now, &rtc->record); + + return 0; +} + +void rtc_reset (void) +{ + debug ("%s()\n", __func__); + ftrtc010_enable (); +} |