diff options
Diffstat (limited to 'src/target/firmware/calypso/rtc.c')
-rw-r--r-- | src/target/firmware/calypso/rtc.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/target/firmware/calypso/rtc.c b/src/target/firmware/calypso/rtc.c new file mode 100644 index 00000000..afa3824b --- /dev/null +++ b/src/target/firmware/calypso/rtc.c @@ -0,0 +1,82 @@ +/* Driver for Calypso RTC controller */ + +/* (C) 2010 by Harald Welte <laforge@gnumonks.org> + * + * All Rights Reserved + * + * 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., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include <stdint.h> +#include <stdio.h> + +#include <debug.h> +#include <memory.h> +#include <calypso/irq.h> +#include <display/st7558.h> + +#define BASE_ADDR_RTC 0xfffe1800 +#define RTC_REG(x) ((void *)BASE_ADDR_RTC + (x)) + +enum rtc_reg { + SECOND_REG = 0x00, + MINUTES_REG = 0x01, + HOURS_REG = 0x02, + DAYS_REG = 0x03, + MONTHS_REG = 0x04, + YEARS_REG = 0x05, + WEEK_REG = 0x06, + /* reserved */ + ALARM_SECOND_REG = 0x08, + ALARM_MINUTES_REG = 0x09, + ALARM_HOURS_REG = 0x0a, + ALARM_DAYS_REG = 0x0b, + ALARM_MONTHS_REG = 0x0c, + ALARM_YEARS_REG = 0x0d, + /* reserved */ + /* reserved */ + CTRL_REG = 0x10, + STATUS_REG = 0x11, + INT_REG = 0x12, + COMP_LSB_REG = 0x13, + COMP_MSB_REG = 0x14, + RES_PROG_REG = 0x15, +}; + +static int tick_ctr; + +static void rtc_irq_tick(enum irq_nr nr) +{ + if (tick_ctr & 1) + st7558_set_attr(DISP_ATTR_INVERT); + else + st7558_unset_attr(DISP_ATTR_INVERT); + tick_ctr++; +} + +void rtc_init(void) +{ + irq_register_handler(IRQ_RTC_TIMER, &rtc_irq_tick); + irq_config(IRQ_RTC_TIMER, 0, 1, 0); + irq_enable(IRQ_RTC_TIMER); + + /* clear power-up reset */ + writeb(0x80, RTC_REG(STATUS_REG)); + /* enable RTC running */ + writeb(0x01, RTC_REG(CTRL_REG)); + /* enable periodic interrupts every second */ + writeb(0x04, RTC_REG(INT_REG)); +} |